summaryrefslogtreecommitdiff
path: root/drivers/i2c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/Kconfig2
-rw-r--r--drivers/i2c/busses/i2c-cadence.c33
-rw-r--r--drivers/i2c/busses/i2c-designware-common.c2
-rw-r--r--drivers/i2c/busses/i2c-designware-core.h23
-rw-r--r--drivers/i2c/busses/i2c-designware-master.c424
-rw-r--r--drivers/i2c/busses/i2c-designware-pcidrv.c2
-rw-r--r--drivers/i2c/busses/i2c-designware-platdrv.c2
-rw-r--r--drivers/i2c/busses/i2c-hisi.c13
-rw-r--r--drivers/i2c/busses/i2c-i801.c223
-rw-r--r--drivers/i2c/busses/i2c-imx-lpi2c.c27
-rw-r--r--drivers/i2c/busses/i2c-imx.c62
-rw-r--r--drivers/i2c/busses/i2c-mpc.c16
-rw-r--r--drivers/i2c/busses/i2c-nomadik.c740
-rw-r--r--drivers/i2c/busses/i2c-npcm7xx.c3
-rw-r--r--drivers/i2c/busses/i2c-pxa.c2
-rw-r--r--drivers/i2c/busses/i2c-sh_mobile.c27
-rw-r--r--drivers/i2c/busses/i2c-sprd.c6
-rw-r--r--drivers/i2c/i2c-core-base.c16
-rw-r--r--drivers/i2c/i2c-smbus.c19
-rw-r--r--drivers/i2c/muxes/i2c-mux-mlxcpld.c2
-rw-r--r--drivers/i2c/muxes/i2c-mux-pca954x.c89
21 files changed, 957 insertions, 776 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 28eb48dd5b32..97989c914260 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -1235,7 +1235,7 @@ config I2C_RCAR
depends on ARCH_RENESAS || COMPILE_TEST
select I2C_SLAVE
select I2C_SMBUS
- select RESET_CONTROLLER if ARCH_RCAR_GEN3
+ select RESET_CONTROLLER if ARCH_RCAR_GEN3 || ARCH_RCAR_GEN4
help
If you say yes to this option, support will be included for the
R-Car I2C controller.
diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c
index de3f58b60dce..4bb7d6756947 100644
--- a/drivers/i2c/busses/i2c-cadence.c
+++ b/drivers/i2c/busses/i2c-cadence.c
@@ -1176,6 +1176,18 @@ static int __maybe_unused cdns_i2c_runtime_suspend(struct device *dev)
return 0;
}
+static int __maybe_unused cdns_i2c_suspend(struct device *dev)
+{
+ struct cdns_i2c *xi2c = dev_get_drvdata(dev);
+
+ i2c_mark_adapter_suspended(&xi2c->adap);
+
+ if (!pm_runtime_status_suspended(dev))
+ return cdns_i2c_runtime_suspend(dev);
+
+ return 0;
+}
+
/**
* cdns_i2c_init - Controller initialisation
* @id: Device private data structure
@@ -1219,7 +1231,28 @@ static int __maybe_unused cdns_i2c_runtime_resume(struct device *dev)
return 0;
}
+static int __maybe_unused cdns_i2c_resume(struct device *dev)
+{
+ struct cdns_i2c *xi2c = dev_get_drvdata(dev);
+ int err;
+
+ err = cdns_i2c_runtime_resume(dev);
+ if (err)
+ return err;
+
+ if (pm_runtime_status_suspended(dev)) {
+ err = cdns_i2c_runtime_suspend(dev);
+ if (err)
+ return err;
+ }
+
+ i2c_mark_adapter_resumed(&xi2c->adap);
+
+ return 0;
+}
+
static const struct dev_pm_ops cdns_i2c_dev_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(cdns_i2c_suspend, cdns_i2c_resume)
SET_RUNTIME_PM_OPS(cdns_i2c_runtime_suspend,
cdns_i2c_runtime_resume, NULL)
};
diff --git a/drivers/i2c/busses/i2c-designware-common.c b/drivers/i2c/busses/i2c-designware-common.c
index 35f762872b8a..e8a688d04aee 100644
--- a/drivers/i2c/busses/i2c-designware-common.c
+++ b/drivers/i2c/busses/i2c-designware-common.c
@@ -648,7 +648,7 @@ void i2c_dw_disable(struct dw_i2c_dev *dev)
__i2c_dw_disable(dev);
/* Disable all interrupts */
- regmap_write(dev->map, DW_IC_INTR_MASK, 0);
+ __i2c_dw_write_intr_mask(dev, 0);
regmap_read(dev->map, DW_IC_CLR_INTR, &dummy);
i2c_dw_release_lock(dev);
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index a7f6f3eafad7..e9606c00b8d1 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -212,6 +212,7 @@ struct reset_control;
* @msg_err: error status of the current transfer
* @status: i2c master status, one of STATUS_*
* @abort_source: copy of the TX_ABRT_SOURCE register
+ * @sw_mask: SW mask of DW_IC_INTR_MASK used in polling mode
* @irq: interrupt number for the i2c master
* @flags: platform specific flags like type of IO accessors or model
* @adapter: i2c subsystem adapter node
@@ -270,6 +271,7 @@ struct dw_i2c_dev {
int msg_err;
unsigned int status;
unsigned int abort_source;
+ unsigned int sw_mask;
int irq;
u32 flags;
struct i2c_adapter adapter;
@@ -303,6 +305,7 @@ struct dw_i2c_dev {
#define ACCESS_INTR_MASK BIT(0)
#define ACCESS_NO_IRQ_SUSPEND BIT(1)
#define ARBITRATION_SEMAPHORE BIT(2)
+#define ACCESS_POLLING BIT(3)
#define MODEL_MSCC_OCELOT BIT(8)
#define MODEL_BAIKAL_BT1 BIT(9)
@@ -318,7 +321,7 @@ struct dw_i2c_dev {
#define AMD_UCSI_INTR_EN 0xd
#define TXGBE_TX_FIFO_DEPTH 4
-#define TXGBE_RX_FIFO_DEPTH 0
+#define TXGBE_RX_FIFO_DEPTH 1
struct i2c_dw_semaphore_callbacks {
int (*probe)(struct dw_i2c_dev *dev);
@@ -351,6 +354,24 @@ static inline void __i2c_dw_disable_nowait(struct dw_i2c_dev *dev)
dev->status &= ~STATUS_ACTIVE;
}
+static inline void __i2c_dw_write_intr_mask(struct dw_i2c_dev *dev,
+ unsigned int intr_mask)
+{
+ unsigned int val = dev->flags & ACCESS_POLLING ? 0 : intr_mask;
+
+ regmap_write(dev->map, DW_IC_INTR_MASK, val);
+ dev->sw_mask = intr_mask;
+}
+
+static inline void __i2c_dw_read_intr_mask(struct dw_i2c_dev *dev,
+ unsigned int *intr_mask)
+{
+ if (!(dev->flags & ACCESS_POLLING))
+ regmap_read(dev->map, DW_IC_INTR_MASK, intr_mask);
+ else
+ *intr_mask = dev->sw_mask;
+}
+
void __i2c_dw_disable(struct dw_i2c_dev *dev);
extern void i2c_dw_configure_master(struct dw_i2c_dev *dev);
diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index 85dbd0eb5392..c7e56002809a 100644
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -240,7 +240,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
msgs[dev->msg_write_idx].addr | ic_tar);
/* Enforce disabled interrupts (due to HW issues) */
- regmap_write(dev->map, DW_IC_INTR_MASK, 0);
+ __i2c_dw_write_intr_mask(dev, 0);
/* Enable the adapter */
__i2c_dw_enable(dev);
@@ -250,7 +250,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
/* Clear and enable interrupts */
regmap_read(dev->map, DW_IC_CLR_INTR, &dummy);
- regmap_write(dev->map, DW_IC_INTR_MASK, DW_IC_INTR_MASTER_MASK);
+ __i2c_dw_write_intr_mask(dev, DW_IC_INTR_MASTER_MASK);
}
static int i2c_dw_check_stopbit(struct dw_i2c_dev *dev)
@@ -300,7 +300,6 @@ static int amd_i2c_dw_xfer_quirk(struct i2c_adapter *adap, struct i2c_msg *msgs,
dev->msgs = msgs;
dev->msgs_num = num_msgs;
i2c_dw_xfer_init(dev);
- regmap_write(dev->map, DW_IC_INTR_MASK, 0);
/* Initiate messages read/write transaction */
for (msg_wrt_idx = 0; msg_wrt_idx < num_msgs; msg_wrt_idx++) {
@@ -355,68 +354,6 @@ static int amd_i2c_dw_xfer_quirk(struct i2c_adapter *adap, struct i2c_msg *msgs,
return 0;
}
-static int i2c_dw_poll_tx_empty(struct dw_i2c_dev *dev)
-{
- u32 val;
-
- return regmap_read_poll_timeout(dev->map, DW_IC_RAW_INTR_STAT, val,
- val & DW_IC_INTR_TX_EMPTY,
- 100, 1000);
-}
-
-static int i2c_dw_poll_rx_full(struct dw_i2c_dev *dev)
-{
- u32 val;
-
- return regmap_read_poll_timeout(dev->map, DW_IC_RAW_INTR_STAT, val,
- val & DW_IC_INTR_RX_FULL,
- 100, 1000);
-}
-
-static int txgbe_i2c_dw_xfer_quirk(struct i2c_adapter *adap, struct i2c_msg *msgs,
- int num_msgs)
-{
- struct dw_i2c_dev *dev = i2c_get_adapdata(adap);
- int msg_idx, buf_len, data_idx, ret;
- unsigned int val, stop = 0;
- u8 *buf;
-
- dev->msgs = msgs;
- dev->msgs_num = num_msgs;
- i2c_dw_xfer_init(dev);
- regmap_write(dev->map, DW_IC_INTR_MASK, 0);
-
- for (msg_idx = 0; msg_idx < num_msgs; msg_idx++) {
- buf = msgs[msg_idx].buf;
- buf_len = msgs[msg_idx].len;
-
- for (data_idx = 0; data_idx < buf_len; data_idx++) {
- if (msg_idx == num_msgs - 1 && data_idx == buf_len - 1)
- stop |= BIT(9);
-
- if (msgs[msg_idx].flags & I2C_M_RD) {
- regmap_write(dev->map, DW_IC_DATA_CMD, 0x100 | stop);
-
- ret = i2c_dw_poll_rx_full(dev);
- if (ret)
- return ret;
-
- regmap_read(dev->map, DW_IC_DATA_CMD, &val);
- buf[data_idx] = val;
- } else {
- ret = i2c_dw_poll_tx_empty(dev);
- if (ret)
- return ret;
-
- regmap_write(dev->map, DW_IC_DATA_CMD,
- buf[data_idx] | stop);
- }
- }
- }
-
- return num_msgs;
-}
-
/*
* Initiate (and continue) low level master read/write transaction.
* This function is only called from i2c_dw_isr, and pumping i2c_msg
@@ -546,7 +483,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
if (dev->msg_err)
intr_mask = 0;
- regmap_write(dev->map, DW_IC_INTR_MASK, intr_mask);
+ __i2c_dw_write_intr_mask(dev, intr_mask);
}
static u8
@@ -554,6 +491,7 @@ i2c_dw_recv_len(struct dw_i2c_dev *dev, u8 len)
{
struct i2c_msg *msgs = dev->msgs;
u32 flags = msgs[dev->msg_read_idx].flags;
+ unsigned int intr_mask;
/*
* Adjust the buffer length and mask the flag
@@ -568,8 +506,9 @@ i2c_dw_recv_len(struct dw_i2c_dev *dev, u8 len)
* Received buffer length, re-enable TX_EMPTY interrupt
* to resume the SMBUS transaction.
*/
- regmap_update_bits(dev->map, DW_IC_INTR_MASK, DW_IC_INTR_TX_EMPTY,
- DW_IC_INTR_TX_EMPTY);
+ __i2c_dw_read_intr_mask(dev, &intr_mask);
+ intr_mask |= DW_IC_INTR_TX_EMPTY;
+ __i2c_dw_write_intr_mask(dev, intr_mask);
return len;
}
@@ -633,6 +572,169 @@ i2c_dw_read(struct dw_i2c_dev *dev)
}
}
+static u32 i2c_dw_read_clear_intrbits(struct dw_i2c_dev *dev)
+{
+ unsigned int stat, dummy;
+
+ /*
+ * The IC_INTR_STAT register just indicates "enabled" interrupts.
+ * The unmasked raw version of interrupt status bits is available
+ * in the IC_RAW_INTR_STAT register.
+ *
+ * That is,
+ * stat = readl(IC_INTR_STAT);
+ * equals to,
+ * stat = readl(IC_RAW_INTR_STAT) & readl(IC_INTR_MASK);
+ *
+ * The raw version might be useful for debugging purposes.
+ */
+ if (!(dev->flags & ACCESS_POLLING)) {
+ regmap_read(dev->map, DW_IC_INTR_STAT, &stat);
+ } else {
+ regmap_read(dev->map, DW_IC_RAW_INTR_STAT, &stat);
+ stat &= dev->sw_mask;
+ }
+
+ /*
+ * Do not use the IC_CLR_INTR register to clear interrupts, or
+ * you'll miss some interrupts, triggered during the period from
+ * readl(IC_INTR_STAT) to readl(IC_CLR_INTR).
+ *
+ * Instead, use the separately-prepared IC_CLR_* registers.
+ */
+ if (stat & DW_IC_INTR_RX_UNDER)
+ regmap_read(dev->map, DW_IC_CLR_RX_UNDER, &dummy);
+ if (stat & DW_IC_INTR_RX_OVER)
+ regmap_read(dev->map, DW_IC_CLR_RX_OVER, &dummy);
+ if (stat & DW_IC_INTR_TX_OVER)
+ regmap_read(dev->map, DW_IC_CLR_TX_OVER, &dummy);
+ if (stat & DW_IC_INTR_RD_REQ)
+ regmap_read(dev->map, DW_IC_CLR_RD_REQ, &dummy);
+ if (stat & DW_IC_INTR_TX_ABRT) {
+ /*
+ * The IC_TX_ABRT_SOURCE register is cleared whenever
+ * the IC_CLR_TX_ABRT is read. Preserve it beforehand.
+ */
+ regmap_read(dev->map, DW_IC_TX_ABRT_SOURCE, &dev->abort_source);
+ regmap_read(dev->map, DW_IC_CLR_TX_ABRT, &dummy);
+ }
+ if (stat & DW_IC_INTR_RX_DONE)
+ regmap_read(dev->map, DW_IC_CLR_RX_DONE, &dummy);
+ if (stat & DW_IC_INTR_ACTIVITY)
+ regmap_read(dev->map, DW_IC_CLR_ACTIVITY, &dummy);
+ if ((stat & DW_IC_INTR_STOP_DET) &&
+ ((dev->rx_outstanding == 0) || (stat & DW_IC_INTR_RX_FULL)))
+ regmap_read(dev->map, DW_IC_CLR_STOP_DET, &dummy);
+ if (stat & DW_IC_INTR_START_DET)
+ regmap_read(dev->map, DW_IC_CLR_START_DET, &dummy);
+ if (stat & DW_IC_INTR_GEN_CALL)
+ regmap_read(dev->map, DW_IC_CLR_GEN_CALL, &dummy);
+
+ return stat;
+}
+
+static void i2c_dw_process_transfer(struct dw_i2c_dev *dev, unsigned int stat)
+{
+ if (stat & DW_IC_INTR_TX_ABRT) {
+ dev->cmd_err |= DW_IC_ERR_TX_ABRT;
+ dev->status &= ~STATUS_MASK;
+ dev->rx_outstanding = 0;
+
+ /*
+ * Anytime TX_ABRT is set, the contents of the tx/rx
+ * buffers are flushed. Make sure to skip them.
+ */
+ __i2c_dw_write_intr_mask(dev, 0);
+ goto tx_aborted;
+ }
+
+ if (stat & DW_IC_INTR_RX_FULL)
+ i2c_dw_read(dev);
+
+ if (stat & DW_IC_INTR_TX_EMPTY)
+ i2c_dw_xfer_msg(dev);
+
+ /*
+ * No need to modify or disable the interrupt mask here.
+ * i2c_dw_xfer_msg() will take care of it according to
+ * the current transmit status.
+ */
+
+tx_aborted:
+ if (((stat & (DW_IC_INTR_TX_ABRT | DW_IC_INTR_STOP_DET)) || dev->msg_err) &&
+ (dev->rx_outstanding == 0))
+ complete(&dev->cmd_complete);
+ else if (unlikely(dev->flags & ACCESS_INTR_MASK)) {
+ /* Workaround to trigger pending interrupt */
+ __i2c_dw_read_intr_mask(dev, &stat);
+ __i2c_dw_write_intr_mask(dev, 0);
+ __i2c_dw_write_intr_mask(dev, stat);
+ }
+}
+
+/*
+ * Interrupt service routine. This gets called whenever an I2C master interrupt
+ * occurs.
+ */
+static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
+{
+ struct dw_i2c_dev *dev = dev_id;
+ unsigned int stat, enabled;
+
+ regmap_read(dev->map, DW_IC_ENABLE, &enabled);
+ regmap_read(dev->map, DW_IC_RAW_INTR_STAT, &stat);
+ if (!enabled || !(stat & ~DW_IC_INTR_ACTIVITY))
+ return IRQ_NONE;
+ if (pm_runtime_suspended(dev->dev) || stat == GENMASK(31, 0))
+ return IRQ_NONE;
+ dev_dbg(dev->dev, "enabled=%#x stat=%#x\n", enabled, stat);
+
+ stat = i2c_dw_read_clear_intrbits(dev);
+
+ if (!(dev->status & STATUS_ACTIVE)) {
+ /*
+ * Unexpected interrupt in driver point of view. State
+ * variables are either unset or stale so acknowledge and
+ * disable interrupts for suppressing further interrupts if
+ * interrupt really came from this HW (E.g. firmware has left
+ * the HW active).
+ */
+ __i2c_dw_write_intr_mask(dev, 0);
+ return IRQ_HANDLED;
+ }
+
+ i2c_dw_process_transfer(dev, stat);
+
+ return IRQ_HANDLED;
+}
+
+static int i2c_dw_wait_transfer(struct dw_i2c_dev *dev)
+{
+ unsigned long timeout = dev->adapter.timeout;
+ unsigned int stat;
+ int ret;
+
+ if (!(dev->flags & ACCESS_POLLING)) {
+ ret = wait_for_completion_timeout(&dev->cmd_complete, timeout);
+ } else {
+ timeout += jiffies;
+ do {
+ ret = try_wait_for_completion(&dev->cmd_complete);
+ if (ret)
+ break;
+
+ stat = i2c_dw_read_clear_intrbits(dev);
+ if (stat)
+ i2c_dw_process_transfer(dev, stat);
+ else
+ /* Try save some power */
+ usleep_range(3, 25);
+ } while (time_before(jiffies, timeout));
+ }
+
+ return ret ? 0 : -ETIMEDOUT;
+}
+
/*
* Prepare controller for a transaction and call i2c_dw_xfer_msg.
*/
@@ -646,18 +748,10 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
pm_runtime_get_sync(dev->dev);
- /*
- * Initiate I2C message transfer when polling mode is enabled,
- * As it is polling based transfer mechanism, which does not support
- * interrupt based functionalities of existing DesignWare driver.
- */
switch (dev->flags & MODEL_MASK) {
case MODEL_AMD_NAVI_GPU:
ret = amd_i2c_dw_xfer_quirk(adap, msgs, num);
goto done_nolock;
- case MODEL_WANGXUN_SP:
- ret = txgbe_i2c_dw_xfer_quirk(adap, msgs, num);
- goto done_nolock;
default:
break;
}
@@ -685,12 +779,12 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
i2c_dw_xfer_init(dev);
/* Wait for tx to complete */
- if (!wait_for_completion_timeout(&dev->cmd_complete, adap->timeout)) {
+ ret = i2c_dw_wait_transfer(dev);
+ if (ret) {
dev_err(dev->dev, "controller timed out\n");
- /* i2c_dw_init implicitly disables the adapter */
+ /* i2c_dw_init_master() implicitly disables the adapter */
i2c_recover_bus(&dev->adapter);
i2c_dw_init_master(dev);
- ret = -ETIMEDOUT;
goto done;
}
@@ -698,7 +792,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
* We must disable the adapter before returning and signaling the end
* of the current transfer. Otherwise the hardware might continue
* generating interrupts which in turn causes a race condition with
- * the following transfer. Needs some more investigation if the
+ * the following transfer. Needs some more investigation if the
* additional interrupts are a hardware bug or this driver doesn't
* handle them correctly yet.
*/
@@ -746,132 +840,6 @@ static const struct i2c_adapter_quirks i2c_dw_quirks = {
.flags = I2C_AQ_NO_ZERO_LEN,
};
-static u32 i2c_dw_read_clear_intrbits(struct dw_i2c_dev *dev)
-{
- unsigned int stat, dummy;
-
- /*
- * The IC_INTR_STAT register just indicates "enabled" interrupts.
- * The unmasked raw version of interrupt status bits is available
- * in the IC_RAW_INTR_STAT register.
- *
- * That is,
- * stat = readl(IC_INTR_STAT);
- * equals to,
- * stat = readl(IC_RAW_INTR_STAT) & readl(IC_INTR_MASK);
- *
- * The raw version might be useful for debugging purposes.
- */
- regmap_read(dev->map, DW_IC_INTR_STAT, &stat);
-
- /*
- * Do not use the IC_CLR_INTR register to clear interrupts, or
- * you'll miss some interrupts, triggered during the period from
- * readl(IC_INTR_STAT) to readl(IC_CLR_INTR).
- *
- * Instead, use the separately-prepared IC_CLR_* registers.
- */
- if (stat & DW_IC_INTR_RX_UNDER)
- regmap_read(dev->map, DW_IC_CLR_RX_UNDER, &dummy);
- if (stat & DW_IC_INTR_RX_OVER)
- regmap_read(dev->map, DW_IC_CLR_RX_OVER, &dummy);
- if (stat & DW_IC_INTR_TX_OVER)
- regmap_read(dev->map, DW_IC_CLR_TX_OVER, &dummy);
- if (stat & DW_IC_INTR_RD_REQ)
- regmap_read(dev->map, DW_IC_CLR_RD_REQ, &dummy);
- if (stat & DW_IC_INTR_TX_ABRT) {
- /*
- * The IC_TX_ABRT_SOURCE register is cleared whenever
- * the IC_CLR_TX_ABRT is read. Preserve it beforehand.
- */
- regmap_read(dev->map, DW_IC_TX_ABRT_SOURCE, &dev->abort_source);
- regmap_read(dev->map, DW_IC_CLR_TX_ABRT, &dummy);
- }
- if (stat & DW_IC_INTR_RX_DONE)
- regmap_read(dev->map, DW_IC_CLR_RX_DONE, &dummy);
- if (stat & DW_IC_INTR_ACTIVITY)
- regmap_read(dev->map, DW_IC_CLR_ACTIVITY, &dummy);
- if ((stat & DW_IC_INTR_STOP_DET) &&
- ((dev->rx_outstanding == 0) || (stat & DW_IC_INTR_RX_FULL)))
- regmap_read(dev->map, DW_IC_CLR_STOP_DET, &dummy);
- if (stat & DW_IC_INTR_START_DET)
- regmap_read(dev->map, DW_IC_CLR_START_DET, &dummy);
- if (stat & DW_IC_INTR_GEN_CALL)
- regmap_read(dev->map, DW_IC_CLR_GEN_CALL, &dummy);
-
- return stat;
-}
-
-/*
- * Interrupt service routine. This gets called whenever an I2C master interrupt
- * occurs.
- */
-static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
-{
- struct dw_i2c_dev *dev = dev_id;
- unsigned int stat, enabled;
-
- regmap_read(dev->map, DW_IC_ENABLE, &enabled);
- regmap_read(dev->map, DW_IC_RAW_INTR_STAT, &stat);
- if (!enabled || !(stat & ~DW_IC_INTR_ACTIVITY))
- return IRQ_NONE;
- if (pm_runtime_suspended(dev->dev) || stat == GENMASK(31, 0))
- return IRQ_NONE;
- dev_dbg(dev->dev, "enabled=%#x stat=%#x\n", enabled, stat);
-
- stat = i2c_dw_read_clear_intrbits(dev);
-
- if (!(dev->status & STATUS_ACTIVE)) {
- /*
- * Unexpected interrupt in driver point of view. State
- * variables are either unset or stale so acknowledge and
- * disable interrupts for suppressing further interrupts if
- * interrupt really came from this HW (E.g. firmware has left
- * the HW active).
- */
- regmap_write(dev->map, DW_IC_INTR_MASK, 0);
- return IRQ_HANDLED;
- }
-
- if (stat & DW_IC_INTR_TX_ABRT) {
- dev->cmd_err |= DW_IC_ERR_TX_ABRT;
- dev->status &= ~STATUS_MASK;
- dev->rx_outstanding = 0;
-
- /*
- * Anytime TX_ABRT is set, the contents of the tx/rx
- * buffers are flushed. Make sure to skip them.
- */
- regmap_write(dev->map, DW_IC_INTR_MASK, 0);
- goto tx_aborted;
- }
-
- if (stat & DW_IC_INTR_RX_FULL)
- i2c_dw_read(dev);
-
- if (stat & DW_IC_INTR_TX_EMPTY)
- i2c_dw_xfer_msg(dev);
-
- /*
- * No need to modify or disable the interrupt mask here.
- * i2c_dw_xfer_msg() will take care of it according to
- * the current transmit status.
- */
-
-tx_aborted:
- if (((stat & (DW_IC_INTR_TX_ABRT | DW_IC_INTR_STOP_DET)) || dev->msg_err) &&
- (dev->rx_outstanding == 0))
- complete(&dev->cmd_complete);
- else if (unlikely(dev->flags & ACCESS_INTR_MASK)) {
- /* Workaround to trigger pending interrupt */
- regmap_read(dev->map, DW_IC_INTR_MASK, &stat);
- regmap_write(dev->map, DW_IC_INTR_MASK, 0);
- regmap_write(dev->map, DW_IC_INTR_MASK, stat);
- }
-
- return IRQ_HANDLED;
-}
-
void i2c_dw_configure_master(struct dw_i2c_dev *dev)
{
struct i2c_timings *t = &dev->timings;
@@ -953,31 +921,6 @@ static int i2c_dw_init_recovery_info(struct dw_i2c_dev *dev)
return 0;
}
-static int i2c_dw_poll_adap_quirk(struct dw_i2c_dev *dev)
-{
- struct i2c_adapter *adap = &dev->adapter;
- int ret;
-
- pm_runtime_get_noresume(dev->dev);
- ret = i2c_add_numbered_adapter(adap);
- if (ret)
- dev_err(dev->dev, "Failed to add adapter: %d\n", ret);
- pm_runtime_put_noidle(dev->dev);
-
- return ret;
-}
-
-static bool i2c_dw_is_model_poll(struct dw_i2c_dev *dev)
-{
- switch (dev->flags & MODEL_MASK) {
- case MODEL_AMD_NAVI_GPU:
- case MODEL_WANGXUN_SP:
- return true;
- default:
- return false;
- }
-}
-
int i2c_dw_probe_master(struct dw_i2c_dev *dev)
{
struct i2c_adapter *adap = &dev->adapter;
@@ -1033,9 +976,6 @@ int i2c_dw_probe_master(struct dw_i2c_dev *dev)
adap->dev.parent = dev->dev;
i2c_set_adapdata(adap, dev);
- if (i2c_dw_is_model_poll(dev))
- return i2c_dw_poll_adap_quirk(dev);
-
if (dev->flags & ACCESS_NO_IRQ_SUSPEND) {
irq_flags = IRQF_NO_SUSPEND;
} else {
@@ -1046,15 +986,17 @@ int i2c_dw_probe_master(struct dw_i2c_dev *dev)
if (ret)
return ret;
- regmap_write(dev->map, DW_IC_INTR_MASK, 0);
+ __i2c_dw_write_intr_mask(dev, 0);
i2c_dw_release_lock(dev);
- ret = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr, irq_flags,
- dev_name(dev->dev), dev);
- if (ret) {
- dev_err(dev->dev, "failure requesting irq %i: %d\n",
- dev->irq, ret);
- return ret;
+ if (!(dev->flags & ACCESS_POLLING)) {
+ ret = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr,
+ irq_flags, dev_name(dev->dev), dev);
+ if (ret) {
+ dev_err(dev->dev, "failure requesting irq %i: %d\n",
+ dev->irq, ret);
+ return ret;
+ }
}
ret = i2c_dw_init_recovery_info(dev);
diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
index 61d7a27aa070..9be9a2658e1f 100644
--- a/drivers/i2c/busses/i2c-designware-pcidrv.c
+++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
@@ -154,7 +154,7 @@ static int navi_amd_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
{
struct dw_i2c_dev *dev = dev_get_drvdata(&pdev->dev);
- dev->flags |= MODEL_AMD_NAVI_GPU;
+ dev->flags |= MODEL_AMD_NAVI_GPU | ACCESS_POLLING;
dev->timings.bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ;
return 0;
}
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 855b698e99c0..4ab41ba39d55 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -290,7 +290,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
dev->flags = (uintptr_t)device_get_match_data(&pdev->dev);
if (device_property_present(&pdev->dev, "wx,i2c-snps-model"))
- dev->flags = MODEL_WANGXUN_SP;
+ dev->flags = MODEL_WANGXUN_SP | ACCESS_POLLING;
dev->dev = &pdev->dev;
dev->irq = irq;
diff --git a/drivers/i2c/busses/i2c-hisi.c b/drivers/i2c/busses/i2c-hisi.c
index dfad5bad5075..975c0b1c44de 100644
--- a/drivers/i2c/busses/i2c-hisi.c
+++ b/drivers/i2c/busses/i2c-hisi.c
@@ -57,6 +57,8 @@
#define HISI_I2C_FS_SPK_LEN_CNT GENMASK(7, 0)
#define HISI_I2C_HS_SPK_LEN 0x003c
#define HISI_I2C_HS_SPK_LEN_CNT GENMASK(7, 0)
+#define HISI_I2C_TX_INT_CLR 0x0040
+#define HISI_I2C_TX_AEMPTY_INT BIT(0)
#define HISI_I2C_INT_MSTAT 0x0044
#define HISI_I2C_INT_CLR 0x0048
#define HISI_I2C_INT_MASK 0x004C
@@ -124,6 +126,11 @@ static void hisi_i2c_clear_int(struct hisi_i2c_controller *ctlr, u32 mask)
writel_relaxed(mask, ctlr->iobase + HISI_I2C_INT_CLR);
}
+static void hisi_i2c_clear_tx_int(struct hisi_i2c_controller *ctlr, u32 mask)
+{
+ writel_relaxed(mask, ctlr->iobase + HISI_I2C_TX_INT_CLR);
+}
+
static void hisi_i2c_handle_errors(struct hisi_i2c_controller *ctlr)
{
u32 int_err = ctlr->xfer_err, reg;
@@ -168,6 +175,7 @@ static int hisi_i2c_start_xfer(struct hisi_i2c_controller *ctlr)
writel(reg, ctlr->iobase + HISI_I2C_FIFO_CTRL);
hisi_i2c_clear_int(ctlr, HISI_I2C_INT_ALL);
+ hisi_i2c_clear_tx_int(ctlr, HISI_I2C_TX_AEMPTY_INT);
hisi_i2c_enable_int(ctlr, HISI_I2C_INT_ALL);
return 0;
@@ -266,7 +274,7 @@ static int hisi_i2c_read_rx_fifo(struct hisi_i2c_controller *ctlr)
static void hisi_i2c_xfer_msg(struct hisi_i2c_controller *ctlr)
{
- int max_write = HISI_I2C_TX_FIFO_DEPTH;
+ int max_write = HISI_I2C_TX_FIFO_DEPTH - HISI_I2C_TX_F_AE_THRESH;
bool need_restart = false, last_msg;
struct i2c_msg *cur_msg;
u32 cmd, fifo_state;
@@ -323,6 +331,8 @@ static void hisi_i2c_xfer_msg(struct hisi_i2c_controller *ctlr)
*/
if (ctlr->msg_tx_idx == ctlr->msg_num)
hisi_i2c_disable_int(ctlr, HISI_I2C_INT_TX_EMPTY);
+
+ hisi_i2c_clear_tx_int(ctlr, HISI_I2C_TX_AEMPTY_INT);
}
static irqreturn_t hisi_i2c_irq(int irq, void *context)
@@ -363,6 +373,7 @@ out:
if (int_stat & HISI_I2C_INT_TRANS_CPLT) {
hisi_i2c_disable_int(ctlr, HISI_I2C_INT_ALL);
hisi_i2c_clear_int(ctlr, HISI_I2C_INT_ALL);
+ hisi_i2c_clear_tx_int(ctlr, HISI_I2C_TX_AEMPTY_INT);
complete(ctlr->completion);
}
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 274e987e4cfa..79870dd7a014 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -205,6 +205,8 @@
#define STATUS_FLAGS (SMBHSTSTS_BYTE_DONE | SMBHSTSTS_INTR | \
STATUS_ERROR_FLAGS)
+#define SMBUS_LEN_SENTINEL (I2C_SMBUS_BLOCK_MAX + 1)
+
/* Older devices have their ID defined in <linux/pci_ids.h> */
#define PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS 0x02a3
#define PCI_DEVICE_ID_INTEL_COMETLAKE_H_SMBUS 0x06a3
@@ -328,11 +330,39 @@ MODULE_PARM_DESC(disable_features, "Disable selected driver features:\n"
"\t\t 0x10 don't use interrupts\n"
"\t\t 0x20 disable SMBus Host Notify ");
+static int i801_get_block_len(struct i801_priv *priv)
+{
+ u8 len = inb_p(SMBHSTDAT0(priv));
+
+ if (len < 1 || len > I2C_SMBUS_BLOCK_MAX) {
+ pci_err(priv->pci_dev, "Illegal SMBus block read size %u\n", len);
+ return -EPROTO;
+ }
+
+ return len;
+}
+
+static int i801_check_and_clear_pec_error(struct i801_priv *priv)
+{
+ u8 status;
+
+ if (!(priv->features & FEATURE_SMBUS_PEC))
+ return 0;
+
+ status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
+ if (status) {
+ outb_p(status, SMBAUXSTS(priv));
+ return -EBADMSG;
+ }
+
+ return 0;
+}
+
/* Make sure the SMBus host is ready to start transmitting.
Return 0 if it is, -EBUSY if it is not. */
static int i801_check_pre(struct i801_priv *priv)
{
- int status;
+ int status, result;
status = inb_p(SMBHSTSTS(priv));
if (status & SMBHSTSTS_HOST_BUSY) {
@@ -353,13 +383,9 @@ static int i801_check_pre(struct i801_priv *priv)
* the hardware was already in this state when the driver
* started.
*/
- if (priv->features & FEATURE_SMBUS_PEC) {
- status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
- if (status) {
- pci_dbg(priv->pci_dev, "Clearing aux status flags (%02x)\n", status);
- outb_p(status, SMBAUXSTS(priv));
- }
- }
+ result = i801_check_and_clear_pec_error(priv);
+ if (result)
+ pci_dbg(priv->pci_dev, "Clearing aux status flag CRCE\n");
return 0;
}
@@ -408,14 +434,12 @@ static int i801_check_post(struct i801_priv *priv, int status)
* bit is harmless as long as it's cleared before
* the next operation.
*/
- if ((priv->features & FEATURE_SMBUS_PEC) &&
- (inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE)) {
- outb_p(SMBAUXSTS_CRCE, SMBAUXSTS(priv));
- result = -EBADMSG;
- dev_dbg(&priv->pci_dev->dev, "PEC error\n");
+ result = i801_check_and_clear_pec_error(priv);
+ if (result) {
+ pci_dbg(priv->pci_dev, "PEC error\n");
} else {
result = -ENXIO;
- dev_dbg(&priv->pci_dev->dev, "No response\n");
+ pci_dbg(priv->pci_dev, "No response\n");
}
}
if (status & SMBHSTSTS_BUS_ERR) {
@@ -512,9 +536,9 @@ static int i801_block_transaction_by_block(struct i801_priv *priv,
if (read_write == I2C_SMBUS_READ ||
command == I2C_SMBUS_BLOCK_PROC_CALL) {
- len = inb_p(SMBHSTDAT0(priv));
- if (len < 1 || len > I2C_SMBUS_BLOCK_MAX) {
- status = -EPROTO;
+ len = i801_get_block_len(priv);
+ if (len < 0) {
+ status = len;
goto out;
}
@@ -531,17 +555,17 @@ out:
static void i801_isr_byte_done(struct i801_priv *priv)
{
if (priv->is_read) {
- /* For SMBus block reads, length is received with first byte */
- if (((priv->cmd & 0x1c) == I801_BLOCK_DATA) &&
- (priv->count == 0)) {
- priv->len = inb_p(SMBHSTDAT0(priv));
- if (priv->len < 1 || priv->len > I2C_SMBUS_BLOCK_MAX) {
- dev_err(&priv->pci_dev->dev,
- "Illegal SMBus block read size %d\n",
- priv->len);
+ /*
+ * At transfer start i801_smbus_block_transaction() marks
+ * the block length as invalid. Check for this sentinel value
+ * and read the block length from SMBHSTDAT0.
+ */
+ if (priv->len == SMBUS_LEN_SENTINEL) {
+ priv->len = i801_get_block_len(priv);
+ if (priv->len < 0)
/* FIXME: Recover */
priv->len = I2C_SMBUS_BLOCK_MAX;
- }
+
priv->data[-1] = priv->len;
}
@@ -688,13 +712,14 @@ static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
if (status)
return status;
- if (i == 1 && read_write == I2C_SMBUS_READ
- && command != I2C_SMBUS_I2C_BLOCK_DATA) {
- len = inb_p(SMBHSTDAT0(priv));
- if (len < 1 || len > I2C_SMBUS_BLOCK_MAX) {
- dev_err(&priv->pci_dev->dev,
- "Illegal SMBus block read size %d\n",
- len);
+ /*
+ * At transfer start i801_smbus_block_transaction() marks
+ * the block length as invalid. Check for this sentinel value
+ * and read the block length from SMBHSTDAT0.
+ */
+ if (len == SMBUS_LEN_SENTINEL) {
+ len = i801_get_block_len(priv);
+ if (len < 0) {
/* Recover */
while (inb_p(SMBHSTSTS(priv)) &
SMBHSTSTS_HOST_BUSY)
@@ -792,77 +817,66 @@ static int i801_simple_transaction(struct i801_priv *priv, union i2c_smbus_data
return 0;
}
-/* Block transaction function */
-static int i801_block_transaction(struct i801_priv *priv, union i2c_smbus_data *data,
- u8 addr, u8 hstcmd, char read_write, int command)
+static int i801_smbus_block_transaction(struct i801_priv *priv, union i2c_smbus_data *data,
+ u8 addr, u8 hstcmd, char read_write, int command)
{
- int result = 0;
- unsigned char hostc;
-
if (read_write == I2C_SMBUS_READ && command == I2C_SMBUS_BLOCK_DATA)
- data->block[0] = I2C_SMBUS_BLOCK_MAX;
+ /* Mark block length as invalid */
+ data->block[0] = SMBUS_LEN_SENTINEL;
else if (data->block[0] < 1 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
return -EPROTO;
- switch (command) {
- case I2C_SMBUS_BLOCK_DATA:
- i801_set_hstadd(priv, addr, read_write);
- outb_p(hstcmd, SMBHSTCMD(priv));
- break;
- case I2C_SMBUS_I2C_BLOCK_DATA:
- /*
- * NB: page 240 of ICH5 datasheet shows that the R/#W
- * bit should be cleared here, even when reading.
- * However if SPD Write Disable is set (Lynx Point and later),
- * the read will fail if we don't set the R/#W bit.
- */
- i801_set_hstadd(priv, addr,
- priv->original_hstcfg & SMBHSTCFG_SPD_WD ?
- read_write : I2C_SMBUS_WRITE);
- if (read_write == I2C_SMBUS_READ) {
- /* NB: page 240 of ICH5 datasheet also shows
- * that DATA1 is the cmd field when reading
- */
- outb_p(hstcmd, SMBHSTDAT1(priv));
- } else
- outb_p(hstcmd, SMBHSTCMD(priv));
-
- if (read_write == I2C_SMBUS_WRITE) {
- /* set I2C_EN bit in configuration register */
- pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &hostc);
- pci_write_config_byte(priv->pci_dev, SMBHSTCFG,
- hostc | SMBHSTCFG_I2C_EN);
- } else if (!(priv->features & FEATURE_I2C_BLOCK_READ)) {
- dev_err(&priv->pci_dev->dev,
- "I2C block read is unsupported!\n");
- return -EOPNOTSUPP;
- }
- break;
- case I2C_SMBUS_BLOCK_PROC_CALL:
+ if (command == I2C_SMBUS_BLOCK_PROC_CALL)
/* Needs to be flagged as write transaction */
i801_set_hstadd(priv, addr, I2C_SMBUS_WRITE);
+ else
+ i801_set_hstadd(priv, addr, read_write);
+ outb_p(hstcmd, SMBHSTCMD(priv));
+
+ if (priv->features & FEATURE_BLOCK_BUFFER)
+ return i801_block_transaction_by_block(priv, data, read_write, command);
+ else
+ return i801_block_transaction_byte_by_byte(priv, data, read_write, command);
+}
+
+static int i801_i2c_block_transaction(struct i801_priv *priv, union i2c_smbus_data *data,
+ u8 addr, u8 hstcmd, char read_write, int command)
+{
+ int result;
+ u8 hostc;
+
+ if (data->block[0] < 1 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
+ return -EPROTO;
+ /*
+ * NB: page 240 of ICH5 datasheet shows that the R/#W bit should be cleared here,
+ * even when reading. However if SPD Write Disable is set (Lynx Point and later),
+ * the read will fail if we don't set the R/#W bit.
+ */
+ i801_set_hstadd(priv, addr,
+ priv->original_hstcfg & SMBHSTCFG_SPD_WD ? read_write : I2C_SMBUS_WRITE);
+
+ /* NB: page 240 of ICH5 datasheet shows that DATA1 is the cmd field when reading */
+ if (read_write == I2C_SMBUS_READ)
+ outb_p(hstcmd, SMBHSTDAT1(priv));
+ else
outb_p(hstcmd, SMBHSTCMD(priv));
- break;
+
+ if (read_write == I2C_SMBUS_WRITE) {
+ /* set I2C_EN bit in configuration register */
+ pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &hostc);
+ pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hostc | SMBHSTCFG_I2C_EN);
+ } else if (!(priv->features & FEATURE_I2C_BLOCK_READ)) {
+ pci_err(priv->pci_dev, "I2C block read is unsupported!\n");
+ return -EOPNOTSUPP;
}
- /* Experience has shown that the block buffer can only be used for
- SMBus (not I2C) block transactions, even though the datasheet
- doesn't mention this limitation. */
- if ((priv->features & FEATURE_BLOCK_BUFFER) &&
- command != I2C_SMBUS_I2C_BLOCK_DATA)
- result = i801_block_transaction_by_block(priv, data,
- read_write,
- command);
- else
- result = i801_block_transaction_byte_by_byte(priv, data,
- read_write,
- command);
+ /* Block buffer isn't supported for I2C block transactions */
+ result = i801_block_transaction_byte_by_byte(priv, data, read_write, command);
- if (command == I2C_SMBUS_I2C_BLOCK_DATA
- && read_write == I2C_SMBUS_WRITE) {
- /* restore saved configuration register value */
+ /* restore saved configuration register value */
+ if (read_write == I2C_SMBUS_WRITE)
pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hostc);
- }
+
return result;
}
@@ -893,10 +907,10 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
outb_p(inb_p(SMBAUXCTL(priv)) & (~SMBAUXCTL_CRC),
SMBAUXCTL(priv));
- if (size == I2C_SMBUS_BLOCK_DATA ||
- size == I2C_SMBUS_I2C_BLOCK_DATA ||
- size == I2C_SMBUS_BLOCK_PROC_CALL)
- ret = i801_block_transaction(priv, data, addr, command, read_write, size);
+ if (size == I2C_SMBUS_BLOCK_DATA || size == I2C_SMBUS_BLOCK_PROC_CALL)
+ ret = i801_smbus_block_transaction(priv, data, addr, command, read_write, size);
+ else if (size == I2C_SMBUS_I2C_BLOCK_DATA)
+ ret = i801_i2c_block_transaction(priv, data, addr, command, read_write, size);
else
ret = i801_simple_transaction(priv, data, addr, command, read_write, size);
@@ -969,11 +983,10 @@ static const struct i2c_algorithm smbus_algorithm = {
.functionality = i801_func,
};
-#define FEATURES_ICH5 (FEATURE_BLOCK_PROC | FEATURE_I2C_BLOCK_READ | \
- FEATURE_IRQ | FEATURE_SMBUS_PEC | \
- FEATURE_BLOCK_BUFFER | FEATURE_HOST_NOTIFY)
#define FEATURES_ICH4 (FEATURE_SMBUS_PEC | FEATURE_BLOCK_BUFFER | \
FEATURE_HOST_NOTIFY)
+#define FEATURES_ICH5 (FEATURES_ICH4 | FEATURE_BLOCK_PROC | \
+ FEATURE_I2C_BLOCK_READ | FEATURE_IRQ)
static const struct pci_device_id i801_ids[] = {
{ PCI_DEVICE_DATA(INTEL, 82801AA_3, 0) },
@@ -1117,7 +1130,7 @@ static void dmi_check_onboard_devices(const struct dmi_header *dm, void *adap)
{
int i, count;
- if (dm->type != 10)
+ if (dm->type != DMI_ENTRY_ONBOARD_DEVICE)
return;
count = (dm->length - sizeof(struct dmi_header)) / 2;
@@ -1447,8 +1460,7 @@ static inline void i801_del_mux(struct i801_priv *priv) { }
#endif
static struct platform_device *
-i801_add_tco_spt(struct i801_priv *priv, struct pci_dev *pci_dev,
- struct resource *tco_res)
+i801_add_tco_spt(struct pci_dev *pci_dev, struct resource *tco_res)
{
static const struct itco_wdt_platform_data pldata = {
.name = "Intel PCH",
@@ -1479,8 +1491,7 @@ i801_add_tco_spt(struct i801_priv *priv, struct pci_dev *pci_dev,
}
static struct platform_device *
-i801_add_tco_cnl(struct i801_priv *priv, struct pci_dev *pci_dev,
- struct resource *tco_res)
+i801_add_tco_cnl(struct pci_dev *pci_dev, struct resource *tco_res)
{
static const struct itco_wdt_platform_data pldata = {
.name = "Intel PCH",
@@ -1520,9 +1531,9 @@ static void i801_add_tco(struct i801_priv *priv)
res->flags = IORESOURCE_IO;
if (priv->features & FEATURE_TCO_CNL)
- priv->tco_pdev = i801_add_tco_cnl(priv, pci_dev, tco_res);
+ priv->tco_pdev = i801_add_tco_cnl(pci_dev, tco_res);
else
- priv->tco_pdev = i801_add_tco_spt(priv, pci_dev, tco_res);
+ priv->tco_pdev = i801_add_tco_spt(pci_dev, tco_res);
if (IS_ERR(priv->tco_pdev))
dev_warn(&pci_dev->dev, "failed to create iTCO device\n");
diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 678b30e90492..6d72e4e126dd 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -106,6 +106,7 @@ struct lpi2c_imx_struct {
unsigned int txfifosize;
unsigned int rxfifosize;
enum lpi2c_imx_mode mode;
+ struct i2c_bus_recovery_info rinfo;
};
static void lpi2c_imx_intctrl(struct lpi2c_imx_struct *lpi2c_imx,
@@ -133,6 +134,8 @@ static int lpi2c_imx_bus_busy(struct lpi2c_imx_struct *lpi2c_imx)
if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
dev_dbg(&lpi2c_imx->adapter.dev, "bus not work\n");
+ if (lpi2c_imx->adapter.bus_recovery_info)
+ i2c_recover_bus(&lpi2c_imx->adapter);
return -ETIMEDOUT;
}
schedule();
@@ -190,6 +193,8 @@ static void lpi2c_imx_stop(struct lpi2c_imx_struct *lpi2c_imx)
if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
dev_dbg(&lpi2c_imx->adapter.dev, "stop timeout\n");
+ if (lpi2c_imx->adapter.bus_recovery_info)
+ i2c_recover_bus(&lpi2c_imx->adapter);
break;
}
schedule();
@@ -325,6 +330,8 @@ static int lpi2c_imx_txfifo_empty(struct lpi2c_imx_struct *lpi2c_imx)
if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
dev_dbg(&lpi2c_imx->adapter.dev, "txfifo empty timeout\n");
+ if (lpi2c_imx->adapter.bus_recovery_info)
+ i2c_recover_bus(&lpi2c_imx->adapter);
return -ETIMEDOUT;
}
schedule();
@@ -526,6 +533,20 @@ static irqreturn_t lpi2c_imx_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static int lpi2c_imx_init_recovery_info(struct lpi2c_imx_struct *lpi2c_imx,
+ struct platform_device *pdev)
+{
+ struct i2c_bus_recovery_info *bri = &lpi2c_imx->rinfo;
+
+ bri->pinctrl = devm_pinctrl_get(&pdev->dev);
+ if (IS_ERR(bri->pinctrl))
+ return PTR_ERR(bri->pinctrl);
+
+ lpi2c_imx->adapter.bus_recovery_info = bri;
+
+ return 0;
+}
+
static u32 lpi2c_imx_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
@@ -600,6 +621,12 @@ static int lpi2c_imx_probe(struct platform_device *pdev)
lpi2c_imx->txfifosize = 1 << (temp & 0x0f);
lpi2c_imx->rxfifosize = 1 << ((temp >> 8) & 0x0f);
+ /* Init optional bus recovery function */
+ ret = lpi2c_imx_init_recovery_info(lpi2c_imx, pdev);
+ /* Give it another chance if pinctrl used is not ready yet */
+ if (ret == -EPROBE_DEFER)
+ goto rpm_disable;
+
ret = i2c_add_adapter(&lpi2c_imx->adapter);
if (ret)
goto rpm_disable;
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 60e813137f84..3842e527116b 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -212,10 +212,6 @@ struct imx_i2c_struct {
const struct imx_i2c_hwdata *hwdata;
struct i2c_bus_recovery_info rinfo;
- struct pinctrl *pinctrl;
- struct pinctrl_state *pinctrl_pins_default;
- struct pinctrl_state *pinctrl_pins_gpio;
-
struct imx_i2c_dma *dma;
struct i2c_client *slave;
enum i2c_slave_event last_slave_event;
@@ -1362,24 +1358,6 @@ static int i2c_imx_xfer_atomic(struct i2c_adapter *adapter,
return result;
}
-static void i2c_imx_prepare_recovery(struct i2c_adapter *adap)
-{
- struct imx_i2c_struct *i2c_imx;
-
- i2c_imx = container_of(adap, struct imx_i2c_struct, adapter);
-
- pinctrl_select_state(i2c_imx->pinctrl, i2c_imx->pinctrl_pins_gpio);
-}
-
-static void i2c_imx_unprepare_recovery(struct i2c_adapter *adap)
-{
- struct imx_i2c_struct *i2c_imx;
-
- i2c_imx = container_of(adap, struct imx_i2c_struct, adapter);
-
- pinctrl_select_state(i2c_imx->pinctrl, i2c_imx->pinctrl_pins_default);
-}
-
/*
* We switch SCL and SDA to their GPIO function and do some bitbanging
* for bus recovery. These alternative pinmux settings can be
@@ -1390,43 +1368,13 @@ static void i2c_imx_unprepare_recovery(struct i2c_adapter *adap)
static int i2c_imx_init_recovery_info(struct imx_i2c_struct *i2c_imx,
struct platform_device *pdev)
{
- struct i2c_bus_recovery_info *rinfo = &i2c_imx->rinfo;
-
- i2c_imx->pinctrl = devm_pinctrl_get(&pdev->dev);
- if (!i2c_imx->pinctrl) {
- dev_info(&pdev->dev, "pinctrl unavailable, bus recovery not supported\n");
- return 0;
- }
- if (IS_ERR(i2c_imx->pinctrl)) {
- dev_info(&pdev->dev, "can't get pinctrl, bus recovery not supported\n");
- return PTR_ERR(i2c_imx->pinctrl);
- }
-
- i2c_imx->pinctrl_pins_default = pinctrl_lookup_state(i2c_imx->pinctrl,
- PINCTRL_STATE_DEFAULT);
- i2c_imx->pinctrl_pins_gpio = pinctrl_lookup_state(i2c_imx->pinctrl,
- "gpio");
- rinfo->sda_gpiod = devm_gpiod_get_optional(&pdev->dev, "sda", GPIOD_IN);
- rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl", GPIOD_OUT_HIGH_OPEN_DRAIN);
-
- if (PTR_ERR(rinfo->sda_gpiod) == -EPROBE_DEFER ||
- PTR_ERR(rinfo->scl_gpiod) == -EPROBE_DEFER) {
- return -EPROBE_DEFER;
- } else if (IS_ERR(rinfo->sda_gpiod) ||
- IS_ERR(rinfo->scl_gpiod) ||
- IS_ERR(i2c_imx->pinctrl_pins_default) ||
- IS_ERR(i2c_imx->pinctrl_pins_gpio)) {
- dev_dbg(&pdev->dev, "recovery information incomplete\n");
- return 0;
- }
+ struct i2c_bus_recovery_info *bri = &i2c_imx->rinfo;
- dev_dbg(&pdev->dev, "using scl%s for recovery\n",
- rinfo->sda_gpiod ? ",sda" : "");
+ bri->pinctrl = devm_pinctrl_get(&pdev->dev);
+ if (IS_ERR(bri->pinctrl))
+ return PTR_ERR(bri->pinctrl);
- rinfo->prepare_recovery = i2c_imx_prepare_recovery;
- rinfo->unprepare_recovery = i2c_imx_unprepare_recovery;
- rinfo->recover_bus = i2c_generic_scl_recovery;
- i2c_imx->adapter.bus_recovery_info = rinfo;
+ i2c_imx->adapter.bus_recovery_info = bri;
return 0;
}
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index e4e4995ab224..8d73c0f405ed 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -30,8 +30,6 @@
#include <asm/mpc85xx.h>
#include <sysdev/fsl_soc.h>
-#define DRV_NAME "mpc-i2c"
-
#define MPC_I2C_CLOCK_LEGACY 0
#define MPC_I2C_CLOCK_PRESERVE (~0U)
@@ -844,16 +842,16 @@ static int fsl_i2c_probe(struct platform_device *op)
mpc_i2c_setup_8xxx(op->dev.of_node, i2c, clock);
}
- /*
- * "fsl,timeout" has been marked as deprecated and, to maintain
- * backward compatibility, we will only look for it if
- * "i2c-scl-clk-low-timeout-us" is not present.
- */
+ /* Sadly, we have to support two deprecated bindings here */
result = of_property_read_u32(op->dev.of_node,
- "i2c-scl-clk-low-timeout-us",
+ "i2c-transfer-timeout-us",
&mpc_ops.timeout);
if (result == -EINVAL)
result = of_property_read_u32(op->dev.of_node,
+ "i2c-scl-clk-low-timeout-us",
+ &mpc_ops.timeout);
+ if (result == -EINVAL)
+ result = of_property_read_u32(op->dev.of_node,
"fsl,timeout", &mpc_ops.timeout);
if (!result) {
@@ -960,7 +958,7 @@ static struct platform_driver mpc_i2c_driver = {
.probe = fsl_i2c_probe,
.remove_new = fsl_i2c_remove,
.driver = {
- .name = DRV_NAME,
+ .name = "mpc-i2c",
.of_match_table = mpc_i2c_of_match,
.pm = &mpc_i2c_pm_ops,
},
diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index b10574d42b7a..4f41a3c7824d 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -6,21 +6,30 @@
* I2C master mode controller driver, used in Nomadik 8815
* and Ux500 platforms.
*
+ * The Mobileye EyeQ5 platform is also supported; it uses
+ * the same Ux500/DB8500 IP block with two quirks:
+ * - The memory bus only supports 32-bit accesses.
+ * - A register must be configured for the I2C speed mode;
+ * it is located in a shared register region called OLB.
+ *
* Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
* Author: Sachin Verma <sachin.verma@st.com>
*/
-#include <linux/init.h>
-#include <linux/module.h>
#include <linux/amba/bus.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/i2c.h>
-#include <linux/err.h>
+#include <linux/bitfield.h>
#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
#include <linux/io.h>
-#include <linux/pm_runtime.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
#include <linux/of.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
#define DRIVER_NAME "nmk-i2c"
@@ -42,61 +51,63 @@
#define I2C_ICR (0x038)
/* Control registers */
-#define I2C_CR_PE (0x1 << 0) /* Peripheral Enable */
-#define I2C_CR_OM (0x3 << 1) /* Operating mode */
-#define I2C_CR_SAM (0x1 << 3) /* Slave addressing mode */
-#define I2C_CR_SM (0x3 << 4) /* Speed mode */
-#define I2C_CR_SGCM (0x1 << 6) /* Slave general call mode */
-#define I2C_CR_FTX (0x1 << 7) /* Flush Transmit */
-#define I2C_CR_FRX (0x1 << 8) /* Flush Receive */
-#define I2C_CR_DMA_TX_EN (0x1 << 9) /* DMA Tx enable */
-#define I2C_CR_DMA_RX_EN (0x1 << 10) /* DMA Rx Enable */
-#define I2C_CR_DMA_SLE (0x1 << 11) /* DMA sync. logic enable */
-#define I2C_CR_LM (0x1 << 12) /* Loopback mode */
-#define I2C_CR_FON (0x3 << 13) /* Filtering on */
-#define I2C_CR_FS (0x3 << 15) /* Force stop enable */
+#define I2C_CR_PE BIT(0) /* Peripheral Enable */
+#define I2C_CR_OM GENMASK(2, 1) /* Operating mode */
+#define I2C_CR_SAM BIT(3) /* Slave addressing mode */
+#define I2C_CR_SM GENMASK(5, 4) /* Speed mode */
+#define I2C_CR_SGCM BIT(6) /* Slave general call mode */
+#define I2C_CR_FTX BIT(7) /* Flush Transmit */
+#define I2C_CR_FRX BIT(8) /* Flush Receive */
+#define I2C_CR_DMA_TX_EN BIT(9) /* DMA Tx enable */
+#define I2C_CR_DMA_RX_EN BIT(10) /* DMA Rx Enable */
+#define I2C_CR_DMA_SLE BIT(11) /* DMA sync. logic enable */
+#define I2C_CR_LM BIT(12) /* Loopback mode */
+#define I2C_CR_FON GENMASK(14, 13) /* Filtering on */
+#define I2C_CR_FS GENMASK(16, 15) /* Force stop enable */
+
+/* Slave control register (SCR) */
+#define I2C_SCR_SLSU GENMASK(31, 16) /* Slave data setup time */
/* Master controller (MCR) register */
-#define I2C_MCR_OP (0x1 << 0) /* Operation */
-#define I2C_MCR_A7 (0x7f << 1) /* 7-bit address */
-#define I2C_MCR_EA10 (0x7 << 8) /* 10-bit Extended address */
-#define I2C_MCR_SB (0x1 << 11) /* Extended address */
-#define I2C_MCR_AM (0x3 << 12) /* Address type */
-#define I2C_MCR_STOP (0x1 << 14) /* Stop condition */
-#define I2C_MCR_LENGTH (0x7ff << 15) /* Transaction length */
+#define I2C_MCR_OP BIT(0) /* Operation */
+#define I2C_MCR_A7 GENMASK(7, 1) /* 7-bit address */
+#define I2C_MCR_EA10 GENMASK(10, 8) /* 10-bit Extended address */
+#define I2C_MCR_SB BIT(11) /* Extended address */
+#define I2C_MCR_AM GENMASK(13, 12) /* Address type */
+#define I2C_MCR_STOP BIT(14) /* Stop condition */
+#define I2C_MCR_LENGTH GENMASK(25, 15) /* Transaction length */
/* Status register (SR) */
-#define I2C_SR_OP (0x3 << 0) /* Operation */
-#define I2C_SR_STATUS (0x3 << 2) /* controller status */
-#define I2C_SR_CAUSE (0x7 << 4) /* Abort cause */
-#define I2C_SR_TYPE (0x3 << 7) /* Receive type */
-#define I2C_SR_LENGTH (0x7ff << 9) /* Transfer length */
+#define I2C_SR_OP GENMASK(1, 0) /* Operation */
+#define I2C_SR_STATUS GENMASK(3, 2) /* controller status */
+#define I2C_SR_CAUSE GENMASK(6, 4) /* Abort cause */
+#define I2C_SR_TYPE GENMASK(8, 7) /* Receive type */
+#define I2C_SR_LENGTH GENMASK(19, 9) /* Transfer length */
+
+/* Baud-rate counter register (BRCR) */
+#define I2C_BRCR_BRCNT1 GENMASK(31, 16) /* Baud-rate counter 1 */
+#define I2C_BRCR_BRCNT2 GENMASK(15, 0) /* Baud-rate counter 2 */
/* Interrupt mask set/clear (IMSCR) bits */
-#define I2C_IT_TXFE (0x1 << 0)
-#define I2C_IT_TXFNE (0x1 << 1)
-#define I2C_IT_TXFF (0x1 << 2)
-#define I2C_IT_TXFOVR (0x1 << 3)
-#define I2C_IT_RXFE (0x1 << 4)
-#define I2C_IT_RXFNF (0x1 << 5)
-#define I2C_IT_RXFF (0x1 << 6)
-#define I2C_IT_RFSR (0x1 << 16)
-#define I2C_IT_RFSE (0x1 << 17)
-#define I2C_IT_WTSR (0x1 << 18)
-#define I2C_IT_MTD (0x1 << 19)
-#define I2C_IT_STD (0x1 << 20)
-#define I2C_IT_MAL (0x1 << 24)
-#define I2C_IT_BERR (0x1 << 25)
-#define I2C_IT_MTDWS (0x1 << 28)
-
-#define GEN_MASK(val, mask, sb) (((val) << (sb)) & (mask))
+#define I2C_IT_TXFE BIT(0)
+#define I2C_IT_TXFNE BIT(1)
+#define I2C_IT_TXFF BIT(2)
+#define I2C_IT_TXFOVR BIT(3)
+#define I2C_IT_RXFE BIT(4)
+#define I2C_IT_RXFNF BIT(5)
+#define I2C_IT_RXFF BIT(6)
+#define I2C_IT_RFSR BIT(16)
+#define I2C_IT_RFSE BIT(17)
+#define I2C_IT_WTSR BIT(18)
+#define I2C_IT_MTD BIT(19)
+#define I2C_IT_STD BIT(20)
+#define I2C_IT_MAL BIT(24)
+#define I2C_IT_BERR BIT(25)
+#define I2C_IT_MTDWS BIT(28)
/* some bits in ICR are reserved */
#define I2C_CLEAR_ALL_INTS 0x131f007f
-/* first three msb bits are reserved */
-#define IRQ_MASK(mask) (mask & 0x1fffffff)
-
/* maximum threshold value */
#define MAX_I2C_FIFO_THRESHOLD 15
@@ -107,6 +118,15 @@ enum i2c_freq_mode {
I2C_FREQ_MODE_FAST_PLUS, /* up to 1 Mb/s */
};
+/* Mobileye EyeQ5 offset into a shared register region (called OLB) */
+#define NMK_I2C_EYEQ5_OLB_IOCR2 0x0B8
+
+enum i2c_eyeq5_speed {
+ I2C_EYEQ5_SPEED_FAST,
+ I2C_EYEQ5_SPEED_FAST_PLUS,
+ I2C_EYEQ5_SPEED_HIGH_SPEED,
+};
+
/**
* struct i2c_vendor_data - per-vendor variations
* @has_mtdws: variant has the MTDWS bit
@@ -131,6 +151,12 @@ enum i2c_operation {
I2C_READ = 0x01
};
+enum i2c_operating_mode {
+ I2C_OM_SLAVE,
+ I2C_OM_MASTER,
+ I2C_OM_MASTER_OR_SLAVE,
+};
+
/**
* struct i2c_nmk_client - client specific data
* @slave_adr: 7-bit slave address
@@ -159,11 +185,13 @@ struct i2c_nmk_client {
* @clk_freq: clock frequency for the operation mode
* @tft: Tx FIFO Threshold in bytes
* @rft: Rx FIFO Threshold in bytes
- * @timeout: Slave response timeout (ms)
+ * @timeout_usecs: Slave response timeout
* @sm: speed mode
* @stop: stop condition.
- * @xfer_complete: acknowledge completion for a I2C message.
+ * @xfer_wq: xfer done wait queue.
+ * @xfer_done: xfer done boolean.
* @result: controller propogated result.
+ * @has_32b_bus: controller is on a bus that only supports 32-bit accesses.
*/
struct nmk_i2c_dev {
struct i2c_vendor_data *vendor;
@@ -176,11 +204,13 @@ struct nmk_i2c_dev {
u32 clk_freq;
unsigned char tft;
unsigned char rft;
- int timeout;
+ u32 timeout_usecs;
enum i2c_freq_mode sm;
int stop;
- struct completion xfer_complete;
+ struct wait_queue_head xfer_wq;
+ bool xfer_done;
int result;
+ bool has_32b_bus;
};
/* controller's abort causes */
@@ -204,18 +234,36 @@ static inline void i2c_clr_bit(void __iomem *reg, u32 mask)
writel(readl(reg) & ~mask, reg);
}
+static inline u8 nmk_i2c_readb(const struct nmk_i2c_dev *priv,
+ unsigned long reg)
+{
+ if (priv->has_32b_bus)
+ return readl(priv->virtbase + reg);
+ else
+ return readb(priv->virtbase + reg);
+}
+
+static inline void nmk_i2c_writeb(const struct nmk_i2c_dev *priv, u32 val,
+ unsigned long reg)
+{
+ if (priv->has_32b_bus)
+ writel(val, priv->virtbase + reg);
+ else
+ writeb(val, priv->virtbase + reg);
+}
+
/**
* flush_i2c_fifo() - This function flushes the I2C FIFO
- * @dev: private data of I2C Driver
+ * @priv: private data of I2C Driver
*
* This function flushes the I2C Tx and Rx FIFOs. It returns
* 0 on successful flushing of FIFO
*/
-static int flush_i2c_fifo(struct nmk_i2c_dev *dev)
+static int flush_i2c_fifo(struct nmk_i2c_dev *priv)
{
#define LOOP_ATTEMPTS 10
+ ktime_t timeout;
int i;
- unsigned long timeout;
/*
* flush the transmit and receive FIFO. The flushing
@@ -224,19 +272,19 @@ static int flush_i2c_fifo(struct nmk_i2c_dev *dev)
* bits, until then no one must access Tx, Rx FIFO and
* should poll on these bits waiting for the completion.
*/
- writel((I2C_CR_FTX | I2C_CR_FRX), dev->virtbase + I2C_CR);
+ writel((I2C_CR_FTX | I2C_CR_FRX), priv->virtbase + I2C_CR);
for (i = 0; i < LOOP_ATTEMPTS; i++) {
- timeout = jiffies + dev->adap.timeout;
+ timeout = ktime_add_us(ktime_get(), priv->timeout_usecs);
- while (!time_after(jiffies, timeout)) {
- if ((readl(dev->virtbase + I2C_CR) &
+ while (ktime_after(timeout, ktime_get())) {
+ if ((readl(priv->virtbase + I2C_CR) &
(I2C_CR_FTX | I2C_CR_FRX)) == 0)
- return 0;
+ return 0;
}
}
- dev_err(&dev->adev->dev,
+ dev_err(&priv->adev->dev,
"flushing operation timed out giving up after %d attempts",
LOOP_ATTEMPTS);
@@ -245,120 +293,121 @@ static int flush_i2c_fifo(struct nmk_i2c_dev *dev)
/**
* disable_all_interrupts() - Disable all interrupts of this I2c Bus
- * @dev: private data of I2C Driver
+ * @priv: private data of I2C Driver
*/
-static void disable_all_interrupts(struct nmk_i2c_dev *dev)
+static void disable_all_interrupts(struct nmk_i2c_dev *priv)
{
- u32 mask = IRQ_MASK(0);
- writel(mask, dev->virtbase + I2C_IMSCR);
+ writel(0, priv->virtbase + I2C_IMSCR);
}
/**
* clear_all_interrupts() - Clear all interrupts of I2C Controller
- * @dev: private data of I2C Driver
+ * @priv: private data of I2C Driver
*/
-static void clear_all_interrupts(struct nmk_i2c_dev *dev)
+static void clear_all_interrupts(struct nmk_i2c_dev *priv)
{
- u32 mask;
- mask = IRQ_MASK(I2C_CLEAR_ALL_INTS);
- writel(mask, dev->virtbase + I2C_ICR);
+ writel(I2C_CLEAR_ALL_INTS, priv->virtbase + I2C_ICR);
}
/**
* init_hw() - initialize the I2C hardware
- * @dev: private data of I2C Driver
+ * @priv: private data of I2C Driver
*/
-static int init_hw(struct nmk_i2c_dev *dev)
+static int init_hw(struct nmk_i2c_dev *priv)
{
int stat;
- stat = flush_i2c_fifo(dev);
+ stat = flush_i2c_fifo(priv);
if (stat)
goto exit;
/* disable the controller */
- i2c_clr_bit(dev->virtbase + I2C_CR, I2C_CR_PE);
+ i2c_clr_bit(priv->virtbase + I2C_CR, I2C_CR_PE);
- disable_all_interrupts(dev);
+ disable_all_interrupts(priv);
- clear_all_interrupts(dev);
+ clear_all_interrupts(priv);
- dev->cli.operation = I2C_NO_OPERATION;
+ priv->cli.operation = I2C_NO_OPERATION;
exit:
return stat;
}
/* enable peripheral, master mode operation */
-#define DEFAULT_I2C_REG_CR ((1 << 1) | I2C_CR_PE)
+#define DEFAULT_I2C_REG_CR (FIELD_PREP(I2C_CR_OM, I2C_OM_MASTER) | I2C_CR_PE)
+
+/* grab top three bits from extended I2C addresses */
+#define ADR_3MSB_BITS GENMASK(9, 7)
/**
* load_i2c_mcr_reg() - load the MCR register
- * @dev: private data of controller
+ * @priv: private data of controller
* @flags: message flags
*/
-static u32 load_i2c_mcr_reg(struct nmk_i2c_dev *dev, u16 flags)
+static u32 load_i2c_mcr_reg(struct nmk_i2c_dev *priv, u16 flags)
{
u32 mcr = 0;
unsigned short slave_adr_3msb_bits;
- mcr |= GEN_MASK(dev->cli.slave_adr, I2C_MCR_A7, 1);
+ mcr |= FIELD_PREP(I2C_MCR_A7, priv->cli.slave_adr);
if (unlikely(flags & I2C_M_TEN)) {
/* 10-bit address transaction */
- mcr |= GEN_MASK(2, I2C_MCR_AM, 12);
+ mcr |= FIELD_PREP(I2C_MCR_AM, 2);
/*
* Get the top 3 bits.
* EA10 represents extended address in MCR. This includes
* the extension (MSB bits) of the 7 bit address loaded
* in A7
*/
- slave_adr_3msb_bits = (dev->cli.slave_adr >> 7) & 0x7;
+ slave_adr_3msb_bits = FIELD_GET(ADR_3MSB_BITS,
+ priv->cli.slave_adr);
- mcr |= GEN_MASK(slave_adr_3msb_bits, I2C_MCR_EA10, 8);
+ mcr |= FIELD_PREP(I2C_MCR_EA10, slave_adr_3msb_bits);
} else {
/* 7-bit address transaction */
- mcr |= GEN_MASK(1, I2C_MCR_AM, 12);
+ mcr |= FIELD_PREP(I2C_MCR_AM, 1);
}
/* start byte procedure not applied */
- mcr |= GEN_MASK(0, I2C_MCR_SB, 11);
+ mcr |= FIELD_PREP(I2C_MCR_SB, 0);
/* check the operation, master read/write? */
- if (dev->cli.operation == I2C_WRITE)
- mcr |= GEN_MASK(I2C_WRITE, I2C_MCR_OP, 0);
+ if (priv->cli.operation == I2C_WRITE)
+ mcr |= FIELD_PREP(I2C_MCR_OP, I2C_WRITE);
else
- mcr |= GEN_MASK(I2C_READ, I2C_MCR_OP, 0);
+ mcr |= FIELD_PREP(I2C_MCR_OP, I2C_READ);
/* stop or repeated start? */
- if (dev->stop)
- mcr |= GEN_MASK(1, I2C_MCR_STOP, 14);
+ if (priv->stop)
+ mcr |= FIELD_PREP(I2C_MCR_STOP, 1);
else
- mcr &= ~(GEN_MASK(1, I2C_MCR_STOP, 14));
+ mcr &= ~FIELD_PREP(I2C_MCR_STOP, 1);
- mcr |= GEN_MASK(dev->cli.count, I2C_MCR_LENGTH, 15);
+ mcr |= FIELD_PREP(I2C_MCR_LENGTH, priv->cli.count);
return mcr;
}
/**
* setup_i2c_controller() - setup the controller
- * @dev: private data of controller
+ * @priv: private data of controller
*/
-static void setup_i2c_controller(struct nmk_i2c_dev *dev)
+static void setup_i2c_controller(struct nmk_i2c_dev *priv)
{
u32 brcr1, brcr2;
u32 i2c_clk, div;
u32 ns;
u16 slsu;
- writel(0x0, dev->virtbase + I2C_CR);
- writel(0x0, dev->virtbase + I2C_HSMCR);
- writel(0x0, dev->virtbase + I2C_TFTR);
- writel(0x0, dev->virtbase + I2C_RFTR);
- writel(0x0, dev->virtbase + I2C_DMAR);
+ writel(0x0, priv->virtbase + I2C_CR);
+ writel(0x0, priv->virtbase + I2C_HSMCR);
+ writel(0x0, priv->virtbase + I2C_TFTR);
+ writel(0x0, priv->virtbase + I2C_RFTR);
+ writel(0x0, priv->virtbase + I2C_DMAR);
- i2c_clk = clk_get_rate(dev->clk);
+ i2c_clk = clk_get_rate(priv->clk);
/*
* set the slsu:
@@ -373,7 +422,7 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
* slsu = cycles / (1000000000 / f) + 1
*/
ns = DIV_ROUND_UP_ULL(1000000000ULL, i2c_clk);
- switch (dev->sm) {
+ switch (priv->sm) {
case I2C_FREQ_MODE_FAST:
case I2C_FREQ_MODE_FAST_PLUS:
slsu = DIV_ROUND_UP(100, ns); /* Fast */
@@ -388,15 +437,15 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
}
slsu += 1;
- dev_dbg(&dev->adev->dev, "calculated SLSU = %04x\n", slsu);
- writel(slsu << 16, dev->virtbase + I2C_SCR);
+ dev_dbg(&priv->adev->dev, "calculated SLSU = %04x\n", slsu);
+ writel(FIELD_PREP(I2C_SCR_SLSU, slsu), priv->virtbase + I2C_SCR);
/*
* The spec says, in case of std. mode the divider is
* 2 whereas it is 3 for fast and fastplus mode of
* operation. TODO - high speed support.
*/
- div = (dev->clk_freq > I2C_MAX_STANDARD_MODE_FREQ) ? 3 : 2;
+ div = (priv->clk_freq > I2C_MAX_STANDARD_MODE_FREQ) ? 3 : 2;
/*
* generate the mask for baud rate counters. The controller
@@ -405,11 +454,11 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
* plus operation. Currently we do not supprt high speed mode
* so set brcr1 to 0.
*/
- brcr1 = 0 << 16;
- brcr2 = (i2c_clk/(dev->clk_freq * div)) & 0xffff;
+ brcr1 = FIELD_PREP(I2C_BRCR_BRCNT1, 0);
+ brcr2 = FIELD_PREP(I2C_BRCR_BRCNT2, i2c_clk / (priv->clk_freq * div));
/* set the baud rate counter register */
- writel((brcr1 | brcr2), dev->virtbase + I2C_BRCR);
+ writel((brcr1 | brcr2), priv->virtbase + I2C_BRCR);
/*
* set the speed mode. Currently we support
@@ -417,125 +466,142 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
* TODO - support for fast mode plus (up to 1Mb/s)
* and high speed (up to 3.4 Mb/s)
*/
- if (dev->sm > I2C_FREQ_MODE_FAST) {
- dev_err(&dev->adev->dev,
+ if (priv->sm > I2C_FREQ_MODE_FAST) {
+ dev_err(&priv->adev->dev,
"do not support this mode defaulting to std. mode\n");
- brcr2 = i2c_clk / (I2C_MAX_STANDARD_MODE_FREQ * 2) & 0xffff;
- writel((brcr1 | brcr2), dev->virtbase + I2C_BRCR);
- writel(I2C_FREQ_MODE_STANDARD << 4,
- dev->virtbase + I2C_CR);
+ brcr2 = FIELD_PREP(I2C_BRCR_BRCNT2,
+ i2c_clk / (I2C_MAX_STANDARD_MODE_FREQ * 2));
+ writel((brcr1 | brcr2), priv->virtbase + I2C_BRCR);
+ writel(FIELD_PREP(I2C_CR_SM, I2C_FREQ_MODE_STANDARD),
+ priv->virtbase + I2C_CR);
}
- writel(dev->sm << 4, dev->virtbase + I2C_CR);
+ writel(FIELD_PREP(I2C_CR_SM, priv->sm), priv->virtbase + I2C_CR);
/* set the Tx and Rx FIFO threshold */
- writel(dev->tft, dev->virtbase + I2C_TFTR);
- writel(dev->rft, dev->virtbase + I2C_RFTR);
+ writel(priv->tft, priv->virtbase + I2C_TFTR);
+ writel(priv->rft, priv->virtbase + I2C_RFTR);
+}
+
+static bool nmk_i2c_wait_xfer_done(struct nmk_i2c_dev *priv)
+{
+ if (priv->timeout_usecs < jiffies_to_usecs(1)) {
+ unsigned long timeout_usecs = priv->timeout_usecs;
+ ktime_t timeout = ktime_set(0, timeout_usecs * NSEC_PER_USEC);
+
+ wait_event_hrtimeout(priv->xfer_wq, priv->xfer_done, timeout);
+ } else {
+ unsigned long timeout = usecs_to_jiffies(priv->timeout_usecs);
+
+ wait_event_timeout(priv->xfer_wq, priv->xfer_done, timeout);
+ }
+
+ return priv->xfer_done;
}
/**
* read_i2c() - Read from I2C client device
- * @dev: private data of I2C Driver
+ * @priv: private data of I2C Driver
* @flags: message flags
*
* This function reads from i2c client device when controller is in
* master mode. There is a completion timeout. If there is no transfer
* before timeout error is returned.
*/
-static int read_i2c(struct nmk_i2c_dev *dev, u16 flags)
+static int read_i2c(struct nmk_i2c_dev *priv, u16 flags)
{
- int status = 0;
u32 mcr, irq_mask;
- unsigned long timeout;
+ int status = 0;
+ bool xfer_done;
- mcr = load_i2c_mcr_reg(dev, flags);
- writel(mcr, dev->virtbase + I2C_MCR);
+ mcr = load_i2c_mcr_reg(priv, flags);
+ writel(mcr, priv->virtbase + I2C_MCR);
/* load the current CR value */
- writel(readl(dev->virtbase + I2C_CR) | DEFAULT_I2C_REG_CR,
- dev->virtbase + I2C_CR);
+ writel(readl(priv->virtbase + I2C_CR) | DEFAULT_I2C_REG_CR,
+ priv->virtbase + I2C_CR);
/* enable the controller */
- i2c_set_bit(dev->virtbase + I2C_CR, I2C_CR_PE);
+ i2c_set_bit(priv->virtbase + I2C_CR, I2C_CR_PE);
- init_completion(&dev->xfer_complete);
+ init_waitqueue_head(&priv->xfer_wq);
+ priv->xfer_done = false;
/* enable interrupts by setting the mask */
irq_mask = (I2C_IT_RXFNF | I2C_IT_RXFF |
I2C_IT_MAL | I2C_IT_BERR);
- if (dev->stop || !dev->vendor->has_mtdws)
+ if (priv->stop || !priv->vendor->has_mtdws)
irq_mask |= I2C_IT_MTD;
else
irq_mask |= I2C_IT_MTDWS;
- irq_mask = I2C_CLEAR_ALL_INTS & IRQ_MASK(irq_mask);
+ irq_mask &= I2C_CLEAR_ALL_INTS;
- writel(readl(dev->virtbase + I2C_IMSCR) | irq_mask,
- dev->virtbase + I2C_IMSCR);
+ writel(readl(priv->virtbase + I2C_IMSCR) | irq_mask,
+ priv->virtbase + I2C_IMSCR);
- timeout = wait_for_completion_timeout(
- &dev->xfer_complete, dev->adap.timeout);
+ xfer_done = nmk_i2c_wait_xfer_done(priv);
- if (timeout == 0) {
+ if (!xfer_done) {
/* Controller timed out */
- dev_err(&dev->adev->dev, "read from slave 0x%x timed out\n",
- dev->cli.slave_adr);
+ dev_err(&priv->adev->dev, "read from slave 0x%x timed out\n",
+ priv->cli.slave_adr);
status = -ETIMEDOUT;
}
return status;
}
-static void fill_tx_fifo(struct nmk_i2c_dev *dev, int no_bytes)
+static void fill_tx_fifo(struct nmk_i2c_dev *priv, int no_bytes)
{
int count;
for (count = (no_bytes - 2);
(count > 0) &&
- (dev->cli.count != 0);
+ (priv->cli.count != 0);
count--) {
/* write to the Tx FIFO */
- writeb(*dev->cli.buffer,
- dev->virtbase + I2C_TFR);
- dev->cli.buffer++;
- dev->cli.count--;
- dev->cli.xfer_bytes++;
+ nmk_i2c_writeb(priv, *priv->cli.buffer, I2C_TFR);
+ priv->cli.buffer++;
+ priv->cli.count--;
+ priv->cli.xfer_bytes++;
}
}
/**
* write_i2c() - Write data to I2C client.
- * @dev: private data of I2C Driver
+ * @priv: private data of I2C Driver
* @flags: message flags
*
* This function writes data to I2C client
*/
-static int write_i2c(struct nmk_i2c_dev *dev, u16 flags)
+static int write_i2c(struct nmk_i2c_dev *priv, u16 flags)
{
- u32 status = 0;
u32 mcr, irq_mask;
- unsigned long timeout;
+ u32 status = 0;
+ bool xfer_done;
- mcr = load_i2c_mcr_reg(dev, flags);
+ mcr = load_i2c_mcr_reg(priv, flags);
- writel(mcr, dev->virtbase + I2C_MCR);
+ writel(mcr, priv->virtbase + I2C_MCR);
/* load the current CR value */
- writel(readl(dev->virtbase + I2C_CR) | DEFAULT_I2C_REG_CR,
- dev->virtbase + I2C_CR);
+ writel(readl(priv->virtbase + I2C_CR) | DEFAULT_I2C_REG_CR,
+ priv->virtbase + I2C_CR);
/* enable the controller */
- i2c_set_bit(dev->virtbase + I2C_CR, I2C_CR_PE);
+ i2c_set_bit(priv->virtbase + I2C_CR, I2C_CR_PE);
- init_completion(&dev->xfer_complete);
+ init_waitqueue_head(&priv->xfer_wq);
+ priv->xfer_done = false;
/* enable interrupts by settings the masks */
irq_mask = (I2C_IT_TXFOVR | I2C_IT_MAL | I2C_IT_BERR);
/* Fill the TX FIFO with transmit data */
- fill_tx_fifo(dev, MAX_I2C_FIFO_THRESHOLD);
+ fill_tx_fifo(priv, MAX_I2C_FIFO_THRESHOLD);
- if (dev->cli.count != 0)
+ if (priv->cli.count != 0)
irq_mask |= I2C_IT_TXFNE;
/*
@@ -543,23 +609,22 @@ static int write_i2c(struct nmk_i2c_dev *dev, u16 flags)
* set the MTDWS bit (Master Transaction Done Without Stop)
* to start repeated start operation
*/
- if (dev->stop || !dev->vendor->has_mtdws)
+ if (priv->stop || !priv->vendor->has_mtdws)
irq_mask |= I2C_IT_MTD;
else
irq_mask |= I2C_IT_MTDWS;
- irq_mask = I2C_CLEAR_ALL_INTS & IRQ_MASK(irq_mask);
+ irq_mask &= I2C_CLEAR_ALL_INTS;
- writel(readl(dev->virtbase + I2C_IMSCR) | irq_mask,
- dev->virtbase + I2C_IMSCR);
+ writel(readl(priv->virtbase + I2C_IMSCR) | irq_mask,
+ priv->virtbase + I2C_IMSCR);
- timeout = wait_for_completion_timeout(
- &dev->xfer_complete, dev->adap.timeout);
+ xfer_done = nmk_i2c_wait_xfer_done(priv);
- if (timeout == 0) {
+ if (!xfer_done) {
/* Controller timed out */
- dev_err(&dev->adev->dev, "write to slave 0x%x timed out\n",
- dev->cli.slave_adr);
+ dev_err(&priv->adev->dev, "write to slave 0x%x timed out\n",
+ priv->cli.slave_adr);
status = -ETIMEDOUT;
}
@@ -568,44 +633,39 @@ static int write_i2c(struct nmk_i2c_dev *dev, u16 flags)
/**
* nmk_i2c_xfer_one() - transmit a single I2C message
- * @dev: device with a message encoded into it
+ * @priv: device with a message encoded into it
* @flags: message flags
*/
-static int nmk_i2c_xfer_one(struct nmk_i2c_dev *dev, u16 flags)
+static int nmk_i2c_xfer_one(struct nmk_i2c_dev *priv, u16 flags)
{
int status;
if (flags & I2C_M_RD) {
/* read operation */
- dev->cli.operation = I2C_READ;
- status = read_i2c(dev, flags);
+ priv->cli.operation = I2C_READ;
+ status = read_i2c(priv, flags);
} else {
/* write operation */
- dev->cli.operation = I2C_WRITE;
- status = write_i2c(dev, flags);
+ priv->cli.operation = I2C_WRITE;
+ status = write_i2c(priv, flags);
}
- if (status || (dev->result)) {
+ if (status || priv->result) {
u32 i2c_sr;
u32 cause;
- i2c_sr = readl(dev->virtbase + I2C_SR);
- /*
- * Check if the controller I2C operation status
- * is set to ABORT(11b).
- */
- if (((i2c_sr >> 2) & 0x3) == 0x3) {
- /* get the abort cause */
- cause = (i2c_sr >> 4) & 0x7;
- dev_err(&dev->adev->dev, "%s\n",
+ i2c_sr = readl(priv->virtbase + I2C_SR);
+ if (FIELD_GET(I2C_SR_STATUS, i2c_sr) == I2C_ABORT) {
+ cause = FIELD_GET(I2C_SR_CAUSE, i2c_sr);
+ dev_err(&priv->adev->dev, "%s\n",
cause >= ARRAY_SIZE(abort_causes) ?
"unknown reason" :
abort_causes[cause]);
}
- (void) init_hw(dev);
+ init_hw(priv);
- status = status ? status : dev->result;
+ status = status ? status : priv->result;
}
return status;
@@ -663,24 +723,24 @@ static int nmk_i2c_xfer(struct i2c_adapter *i2c_adap,
{
int status = 0;
int i;
- struct nmk_i2c_dev *dev = i2c_get_adapdata(i2c_adap);
+ struct nmk_i2c_dev *priv = i2c_get_adapdata(i2c_adap);
int j;
- pm_runtime_get_sync(&dev->adev->dev);
+ pm_runtime_get_sync(&priv->adev->dev);
/* Attempt three times to send the message queue */
for (j = 0; j < 3; j++) {
/* setup the i2c controller */
- setup_i2c_controller(dev);
+ setup_i2c_controller(priv);
for (i = 0; i < num_msgs; i++) {
- dev->cli.slave_adr = msgs[i].addr;
- dev->cli.buffer = msgs[i].buf;
- dev->cli.count = msgs[i].len;
- dev->stop = (i < (num_msgs - 1)) ? 0 : 1;
- dev->result = 0;
+ priv->cli.slave_adr = msgs[i].addr;
+ priv->cli.buffer = msgs[i].buf;
+ priv->cli.count = msgs[i].len;
+ priv->stop = (i < (num_msgs - 1)) ? 0 : 1;
+ priv->result = 0;
- status = nmk_i2c_xfer_one(dev, msgs[i].flags);
+ status = nmk_i2c_xfer_one(priv, msgs[i].flags);
if (status != 0)
break;
}
@@ -688,7 +748,7 @@ static int nmk_i2c_xfer(struct i2c_adapter *i2c_adap,
break;
}
- pm_runtime_put_sync(&dev->adev->dev);
+ pm_runtime_put_sync(&priv->adev->dev);
/* return the no. messages processed */
if (status)
@@ -699,14 +759,14 @@ static int nmk_i2c_xfer(struct i2c_adapter *i2c_adap,
/**
* disable_interrupts() - disable the interrupts
- * @dev: private data of controller
+ * @priv: private data of controller
* @irq: interrupt number
*/
-static int disable_interrupts(struct nmk_i2c_dev *dev, u32 irq)
+static int disable_interrupts(struct nmk_i2c_dev *priv, u32 irq)
{
- irq = IRQ_MASK(irq);
- writel(readl(dev->virtbase + I2C_IMSCR) & ~(I2C_CLEAR_ALL_INTS & irq),
- dev->virtbase + I2C_IMSCR);
+ irq &= I2C_CLEAR_ALL_INTS;
+ writel(readl(priv->virtbase + I2C_IMSCR) & ~irq,
+ priv->virtbase + I2C_IMSCR);
return 0;
}
@@ -723,38 +783,39 @@ static int disable_interrupts(struct nmk_i2c_dev *dev, u32 irq)
*/
static irqreturn_t i2c_irq_handler(int irq, void *arg)
{
- struct nmk_i2c_dev *dev = arg;
+ struct nmk_i2c_dev *priv = arg;
+ struct device *dev = &priv->adev->dev;
u32 tft, rft;
u32 count;
u32 misr, src;
/* load Tx FIFO and Rx FIFO threshold values */
- tft = readl(dev->virtbase + I2C_TFTR);
- rft = readl(dev->virtbase + I2C_RFTR);
+ tft = readl(priv->virtbase + I2C_TFTR);
+ rft = readl(priv->virtbase + I2C_RFTR);
/* read interrupt status register */
- misr = readl(dev->virtbase + I2C_MISR);
+ misr = readl(priv->virtbase + I2C_MISR);
src = __ffs(misr);
- switch ((1 << src)) {
+ switch (BIT(src)) {
/* Transmit FIFO nearly empty interrupt */
case I2C_IT_TXFNE:
{
- if (dev->cli.operation == I2C_READ) {
+ if (priv->cli.operation == I2C_READ) {
/*
* in read operation why do we care for writing?
* so disable the Transmit FIFO interrupt
*/
- disable_interrupts(dev, I2C_IT_TXFNE);
+ disable_interrupts(priv, I2C_IT_TXFNE);
} else {
- fill_tx_fifo(dev, (MAX_I2C_FIFO_THRESHOLD - tft));
+ fill_tx_fifo(priv, (MAX_I2C_FIFO_THRESHOLD - tft));
/*
* if done, close the transfer by disabling the
* corresponding TXFNE interrupt
*/
- if (dev->cli.count == 0)
- disable_interrupts(dev, I2C_IT_TXFNE);
+ if (priv->cli.count == 0)
+ disable_interrupts(priv, I2C_IT_TXFNE);
}
}
break;
@@ -768,60 +829,63 @@ static irqreturn_t i2c_irq_handler(int irq, void *arg)
case I2C_IT_RXFNF:
for (count = rft; count > 0; count--) {
/* Read the Rx FIFO */
- *dev->cli.buffer = readb(dev->virtbase + I2C_RFR);
- dev->cli.buffer++;
+ *priv->cli.buffer = nmk_i2c_readb(priv, I2C_RFR);
+ priv->cli.buffer++;
}
- dev->cli.count -= rft;
- dev->cli.xfer_bytes += rft;
+ priv->cli.count -= rft;
+ priv->cli.xfer_bytes += rft;
break;
/* Rx FIFO full */
case I2C_IT_RXFF:
for (count = MAX_I2C_FIFO_THRESHOLD; count > 0; count--) {
- *dev->cli.buffer = readb(dev->virtbase + I2C_RFR);
- dev->cli.buffer++;
+ *priv->cli.buffer = nmk_i2c_readb(priv, I2C_RFR);
+ priv->cli.buffer++;
}
- dev->cli.count -= MAX_I2C_FIFO_THRESHOLD;
- dev->cli.xfer_bytes += MAX_I2C_FIFO_THRESHOLD;
+ priv->cli.count -= MAX_I2C_FIFO_THRESHOLD;
+ priv->cli.xfer_bytes += MAX_I2C_FIFO_THRESHOLD;
break;
/* Master Transaction Done with/without stop */
case I2C_IT_MTD:
case I2C_IT_MTDWS:
- if (dev->cli.operation == I2C_READ) {
- while (!(readl(dev->virtbase + I2C_RISR)
+ if (priv->cli.operation == I2C_READ) {
+ while (!(readl(priv->virtbase + I2C_RISR)
& I2C_IT_RXFE)) {
- if (dev->cli.count == 0)
+ if (priv->cli.count == 0)
break;
- *dev->cli.buffer =
- readb(dev->virtbase + I2C_RFR);
- dev->cli.buffer++;
- dev->cli.count--;
- dev->cli.xfer_bytes++;
+ *priv->cli.buffer =
+ nmk_i2c_readb(priv, I2C_RFR);
+ priv->cli.buffer++;
+ priv->cli.count--;
+ priv->cli.xfer_bytes++;
}
}
- disable_all_interrupts(dev);
- clear_all_interrupts(dev);
+ disable_all_interrupts(priv);
+ clear_all_interrupts(priv);
- if (dev->cli.count) {
- dev->result = -EIO;
- dev_err(&dev->adev->dev,
- "%lu bytes still remain to be xfered\n",
- dev->cli.count);
- (void) init_hw(dev);
+ if (priv->cli.count) {
+ priv->result = -EIO;
+ dev_err(dev, "%lu bytes still remain to be xfered\n",
+ priv->cli.count);
+ init_hw(priv);
}
- complete(&dev->xfer_complete);
+ priv->xfer_done = true;
+ wake_up(&priv->xfer_wq);
+
break;
/* Master Arbitration lost interrupt */
case I2C_IT_MAL:
- dev->result = -EIO;
- (void) init_hw(dev);
+ priv->result = -EIO;
+ init_hw(priv);
+
+ i2c_set_bit(priv->virtbase + I2C_ICR, I2C_IT_MAL);
+ priv->xfer_done = true;
+ wake_up(&priv->xfer_wq);
- i2c_set_bit(dev->virtbase + I2C_ICR, I2C_IT_MAL);
- complete(&dev->xfer_complete);
break;
@@ -831,15 +895,20 @@ static irqreturn_t i2c_irq_handler(int irq, void *arg)
* during the transaction.
*/
case I2C_IT_BERR:
- dev->result = -EIO;
- /* get the status */
- if (((readl(dev->virtbase + I2C_SR) >> 2) & 0x3) == I2C_ABORT)
- (void) init_hw(dev);
+ {
+ u32 sr;
- i2c_set_bit(dev->virtbase + I2C_ICR, I2C_IT_BERR);
- complete(&dev->xfer_complete);
+ sr = readl(priv->virtbase + I2C_SR);
+ priv->result = -EIO;
+ if (FIELD_GET(I2C_SR_STATUS, sr) == I2C_ABORT)
+ init_hw(priv);
- break;
+ i2c_set_bit(priv->virtbase + I2C_ICR, I2C_IT_BERR);
+ priv->xfer_done = true;
+ wake_up(&priv->xfer_wq);
+
+ }
+ break;
/*
* Tx FIFO overrun interrupt.
@@ -847,11 +916,13 @@ static irqreturn_t i2c_irq_handler(int irq, void *arg)
* the Tx FIFO is full.
*/
case I2C_IT_TXFOVR:
- dev->result = -EIO;
- (void) init_hw(dev);
+ priv->result = -EIO;
+ init_hw(priv);
+
+ dev_err(dev, "Tx Fifo Over run\n");
+ priv->xfer_done = true;
+ wake_up(&priv->xfer_wq);
- dev_err(&dev->adev->dev, "Tx Fifo Over run\n");
- complete(&dev->xfer_complete);
break;
@@ -863,10 +934,10 @@ static irqreturn_t i2c_irq_handler(int irq, void *arg)
case I2C_IT_RFSE:
case I2C_IT_WTSR:
case I2C_IT_STD:
- dev_err(&dev->adev->dev, "unhandled Interrupt\n");
+ dev_err(dev, "unhandled Interrupt\n");
break;
default:
- dev_err(&dev->adev->dev, "spurious Interrupt..\n");
+ dev_err(dev, "spurious Interrupt..\n");
break;
}
@@ -893,9 +964,9 @@ static int nmk_i2c_resume_early(struct device *dev)
static int nmk_i2c_runtime_suspend(struct device *dev)
{
struct amba_device *adev = to_amba_device(dev);
- struct nmk_i2c_dev *nmk_i2c = amba_get_drvdata(adev);
+ struct nmk_i2c_dev *priv = amba_get_drvdata(adev);
- clk_disable_unprepare(nmk_i2c->clk);
+ clk_disable_unprepare(priv->clk);
pinctrl_pm_select_idle_state(dev);
return 0;
}
@@ -903,10 +974,10 @@ static int nmk_i2c_runtime_suspend(struct device *dev)
static int nmk_i2c_runtime_resume(struct device *dev)
{
struct amba_device *adev = to_amba_device(dev);
- struct nmk_i2c_dev *nmk_i2c = amba_get_drvdata(adev);
+ struct nmk_i2c_dev *priv = amba_get_drvdata(adev);
int ret;
- ret = clk_prepare_enable(nmk_i2c->clk);
+ ret = clk_prepare_enable(priv->clk);
if (ret) {
dev_err(dev, "can't prepare_enable clock\n");
return ret;
@@ -914,9 +985,9 @@ static int nmk_i2c_runtime_resume(struct device *dev)
pinctrl_pm_select_default_state(dev);
- ret = init_hw(nmk_i2c);
+ ret = init_hw(priv);
if (ret) {
- clk_disable_unprepare(nmk_i2c->clk);
+ clk_disable_unprepare(priv->clk);
pinctrl_pm_select_idle_state(dev);
}
@@ -939,107 +1010,160 @@ static const struct i2c_algorithm nmk_i2c_algo = {
};
static void nmk_i2c_of_probe(struct device_node *np,
- struct nmk_i2c_dev *nmk)
+ struct nmk_i2c_dev *priv)
{
+ u32 timeout_usecs;
+
/* Default to 100 kHz if no frequency is given in the node */
- if (of_property_read_u32(np, "clock-frequency", &nmk->clk_freq))
- nmk->clk_freq = I2C_MAX_STANDARD_MODE_FREQ;
+ if (of_property_read_u32(np, "clock-frequency", &priv->clk_freq))
+ priv->clk_freq = I2C_MAX_STANDARD_MODE_FREQ;
/* This driver only supports 'standard' and 'fast' modes of operation. */
- if (nmk->clk_freq <= I2C_MAX_STANDARD_MODE_FREQ)
- nmk->sm = I2C_FREQ_MODE_STANDARD;
+ if (priv->clk_freq <= I2C_MAX_STANDARD_MODE_FREQ)
+ priv->sm = I2C_FREQ_MODE_STANDARD;
+ else
+ priv->sm = I2C_FREQ_MODE_FAST;
+ priv->tft = 1; /* Tx FIFO threshold */
+ priv->rft = 8; /* Rx FIFO threshold */
+
+ /* Slave response timeout */
+ if (!of_property_read_u32(np, "i2c-transfer-timeout-us", &timeout_usecs))
+ priv->timeout_usecs = timeout_usecs;
+ else
+ priv->timeout_usecs = 200 * USEC_PER_MSEC;
+}
+
+static const unsigned int nmk_i2c_eyeq5_masks[] = {
+ GENMASK(5, 4),
+ GENMASK(7, 6),
+ GENMASK(9, 8),
+ GENMASK(11, 10),
+ GENMASK(13, 12),
+};
+
+static int nmk_i2c_eyeq5_probe(struct nmk_i2c_dev *priv)
+{
+ struct device *dev = &priv->adev->dev;
+ struct device_node *np = dev->of_node;
+ unsigned int mask, speed_mode;
+ struct regmap *olb;
+ unsigned int id;
+
+ priv->has_32b_bus = true;
+
+ olb = syscon_regmap_lookup_by_phandle_args(np, "mobileye,olb", 1, &id);
+ if (IS_ERR(olb))
+ return PTR_ERR(olb);
+ if (id >= ARRAY_SIZE(nmk_i2c_eyeq5_masks))
+ return -ENOENT;
+
+ if (priv->clk_freq <= 400000)
+ speed_mode = I2C_EYEQ5_SPEED_FAST;
+ else if (priv->clk_freq <= 1000000)
+ speed_mode = I2C_EYEQ5_SPEED_FAST_PLUS;
else
- nmk->sm = I2C_FREQ_MODE_FAST;
- nmk->tft = 1; /* Tx FIFO threshold */
- nmk->rft = 8; /* Rx FIFO threshold */
- nmk->timeout = 200; /* Slave response timeout(ms) */
+ speed_mode = I2C_EYEQ5_SPEED_HIGH_SPEED;
+
+ mask = nmk_i2c_eyeq5_masks[id];
+ regmap_update_bits(olb, NMK_I2C_EYEQ5_OLB_IOCR2,
+ mask, speed_mode << __fls(mask));
+
+ return 0;
}
static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
{
int ret = 0;
+ struct nmk_i2c_dev *priv;
struct device_node *np = adev->dev.of_node;
- struct nmk_i2c_dev *dev;
+ struct device *dev = &adev->dev;
struct i2c_adapter *adap;
struct i2c_vendor_data *vendor = id->data;
u32 max_fifo_threshold = (vendor->fifodepth / 2) - 1;
- dev = devm_kzalloc(&adev->dev, sizeof(*dev), GFP_KERNEL);
- if (!dev)
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
return -ENOMEM;
- dev->vendor = vendor;
- dev->adev = adev;
- nmk_i2c_of_probe(np, dev);
+ priv->vendor = vendor;
+ priv->adev = adev;
+ priv->has_32b_bus = false;
+ nmk_i2c_of_probe(np, priv);
+
+ if (of_device_is_compatible(np, "mobileye,eyeq5-i2c")) {
+ ret = nmk_i2c_eyeq5_probe(priv);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed OLB lookup\n");
+ }
- if (dev->tft > max_fifo_threshold) {
- dev_warn(&adev->dev, "requested TX FIFO threshold %u, adjusted down to %u\n",
- dev->tft, max_fifo_threshold);
- dev->tft = max_fifo_threshold;
+ if (priv->tft > max_fifo_threshold) {
+ dev_warn(dev, "requested TX FIFO threshold %u, adjusted down to %u\n",
+ priv->tft, max_fifo_threshold);
+ priv->tft = max_fifo_threshold;
}
- if (dev->rft > max_fifo_threshold) {
- dev_warn(&adev->dev, "requested RX FIFO threshold %u, adjusted down to %u\n",
- dev->rft, max_fifo_threshold);
- dev->rft = max_fifo_threshold;
+ if (priv->rft > max_fifo_threshold) {
+ dev_warn(dev, "requested RX FIFO threshold %u, adjusted down to %u\n",
+ priv->rft, max_fifo_threshold);
+ priv->rft = max_fifo_threshold;
}
- amba_set_drvdata(adev, dev);
+ amba_set_drvdata(adev, priv);
- dev->virtbase = devm_ioremap(&adev->dev, adev->res.start,
- resource_size(&adev->res));
- if (!dev->virtbase)
+ priv->virtbase = devm_ioremap(dev, adev->res.start,
+ resource_size(&adev->res));
+ if (!priv->virtbase)
return -ENOMEM;
- dev->irq = adev->irq[0];
- ret = devm_request_irq(&adev->dev, dev->irq, i2c_irq_handler, 0,
- DRIVER_NAME, dev);
+ priv->irq = adev->irq[0];
+ ret = devm_request_irq(dev, priv->irq, i2c_irq_handler, 0,
+ DRIVER_NAME, priv);
if (ret)
- return dev_err_probe(&adev->dev, ret,
- "cannot claim the irq %d\n", dev->irq);
+ return dev_err_probe(dev, ret,
+ "cannot claim the irq %d\n", priv->irq);
- dev->clk = devm_clk_get_enabled(&adev->dev, NULL);
- if (IS_ERR(dev->clk))
- return dev_err_probe(&adev->dev, PTR_ERR(dev->clk),
+ priv->clk = devm_clk_get_enabled(dev, NULL);
+ if (IS_ERR(priv->clk))
+ return dev_err_probe(dev, PTR_ERR(priv->clk),
"could enable i2c clock\n");
- init_hw(dev);
+ init_hw(priv);
- adap = &dev->adap;
+ adap = &priv->adap;
adap->dev.of_node = np;
- adap->dev.parent = &adev->dev;
+ adap->dev.parent = dev;
adap->owner = THIS_MODULE;
adap->class = I2C_CLASS_DEPRECATED;
adap->algo = &nmk_i2c_algo;
- adap->timeout = msecs_to_jiffies(dev->timeout);
+ adap->timeout = usecs_to_jiffies(priv->timeout_usecs);
snprintf(adap->name, sizeof(adap->name),
"Nomadik I2C at %pR", &adev->res);
- i2c_set_adapdata(adap, dev);
+ i2c_set_adapdata(adap, priv);
- dev_info(&adev->dev,
+ dev_info(dev,
"initialize %s on virtual base %p\n",
- adap->name, dev->virtbase);
+ adap->name, priv->virtbase);
ret = i2c_add_adapter(adap);
if (ret)
return ret;
- pm_runtime_put(&adev->dev);
+ pm_runtime_put(dev);
return 0;
}
static void nmk_i2c_remove(struct amba_device *adev)
{
- struct nmk_i2c_dev *dev = amba_get_drvdata(adev);
+ struct nmk_i2c_dev *priv = amba_get_drvdata(adev);
- i2c_del_adapter(&dev->adap);
- flush_i2c_fifo(dev);
- disable_all_interrupts(dev);
- clear_all_interrupts(dev);
+ i2c_del_adapter(&priv->adap);
+ flush_i2c_fifo(priv);
+ disable_all_interrupts(priv);
+ clear_all_interrupts(priv);
/* disable the controller */
- i2c_clr_bit(dev->virtbase + I2C_CR, I2C_CR_PE);
+ i2c_clr_bit(priv->virtbase + I2C_CR, I2C_CR_PE);
}
static struct i2c_vendor_data vendor_stn8815 = {
diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c
index 54181b3f1919..2fe68615942e 100644
--- a/drivers/i2c/busses/i2c-npcm7xx.c
+++ b/drivers/i2c/busses/i2c-npcm7xx.c
@@ -1264,9 +1264,6 @@ static int npcm_i2c_reg_slave(struct i2c_client *client)
bus->slave = client;
- if (!bus->slave)
- return -EINVAL;
-
if (client->flags & I2C_CLIENT_TEN)
return -EAFNOSUPPORT;
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index 76f79b68cef8..888ca636f3f3 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -324,6 +324,7 @@ static void decode_ISR(unsigned int val)
decode_bits(KERN_DEBUG "ISR", isr_bits, ARRAY_SIZE(isr_bits), val);
}
+#ifdef CONFIG_I2C_PXA_SLAVE
static const struct bits icr_bits[] = {
PXA_BIT(ICR_START, "START", NULL),
PXA_BIT(ICR_STOP, "STOP", NULL),
@@ -342,7 +343,6 @@ static const struct bits icr_bits[] = {
PXA_BIT(ICR_UR, "UR", "ur"),
};
-#ifdef CONFIG_I2C_PXA_SLAVE
static void decode_ICR(unsigned int val)
{
decode_bits(KERN_DEBUG "ICR", icr_bits, ARRAY_SIZE(icr_bits), val);
diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 5adbe62cf621..c65ac3d7eadc 100644
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -773,7 +773,7 @@ static int sh_mobile_i2c_r8a7740_workaround(struct sh_mobile_i2c_data *pd)
iic_wr(pd, ICCR, ICCR_TRS);
udelay(10);
- return sh_mobile_i2c_init(pd);
+ return sh_mobile_i2c_v2_init(pd);
}
static const struct sh_mobile_dt_config default_dt_config = {
@@ -783,11 +783,6 @@ static const struct sh_mobile_dt_config default_dt_config = {
static const struct sh_mobile_dt_config fast_clock_dt_config = {
.clks_per_count = 2,
- .setup = sh_mobile_i2c_init,
-};
-
-static const struct sh_mobile_dt_config v2_freq_calc_dt_config = {
- .clks_per_count = 2,
.setup = sh_mobile_i2c_v2_init,
};
@@ -799,17 +794,17 @@ static const struct sh_mobile_dt_config r8a7740_dt_config = {
static const struct of_device_id sh_mobile_i2c_dt_ids[] = {
{ .compatible = "renesas,iic-r8a73a4", .data = &fast_clock_dt_config },
{ .compatible = "renesas,iic-r8a7740", .data = &r8a7740_dt_config },
- { .compatible = "renesas,iic-r8a774c0", .data = &v2_freq_calc_dt_config },
- { .compatible = "renesas,iic-r8a7790", .data = &v2_freq_calc_dt_config },
- { .compatible = "renesas,iic-r8a7791", .data = &v2_freq_calc_dt_config },
- { .compatible = "renesas,iic-r8a7792", .data = &v2_freq_calc_dt_config },
- { .compatible = "renesas,iic-r8a7793", .data = &v2_freq_calc_dt_config },
- { .compatible = "renesas,iic-r8a7794", .data = &v2_freq_calc_dt_config },
- { .compatible = "renesas,iic-r8a7795", .data = &v2_freq_calc_dt_config },
- { .compatible = "renesas,iic-r8a77990", .data = &v2_freq_calc_dt_config },
+ { .compatible = "renesas,iic-r8a774c0", .data = &fast_clock_dt_config },
+ { .compatible = "renesas,iic-r8a7790", .data = &fast_clock_dt_config },
+ { .compatible = "renesas,iic-r8a7791", .data = &fast_clock_dt_config },
+ { .compatible = "renesas,iic-r8a7792", .data = &fast_clock_dt_config },
+ { .compatible = "renesas,iic-r8a7793", .data = &fast_clock_dt_config },
+ { .compatible = "renesas,iic-r8a7794", .data = &fast_clock_dt_config },
+ { .compatible = "renesas,iic-r8a7795", .data = &fast_clock_dt_config },
+ { .compatible = "renesas,iic-r8a77990", .data = &fast_clock_dt_config },
{ .compatible = "renesas,iic-sh73a0", .data = &fast_clock_dt_config },
- { .compatible = "renesas,rcar-gen2-iic", .data = &v2_freq_calc_dt_config },
- { .compatible = "renesas,rcar-gen3-iic", .data = &v2_freq_calc_dt_config },
+ { .compatible = "renesas,rcar-gen2-iic", .data = &fast_clock_dt_config },
+ { .compatible = "renesas,rcar-gen3-iic", .data = &fast_clock_dt_config },
{ .compatible = "renesas,rmobile-iic", .data = &default_dt_config },
{},
};
diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c
index c52d1bec60b4..28c88901d9bc 100644
--- a/drivers/i2c/busses/i2c-sprd.c
+++ b/drivers/i2c/busses/i2c-sprd.c
@@ -570,7 +570,7 @@ err_rpm_put:
return ret;
}
-static int sprd_i2c_remove(struct platform_device *pdev)
+static void sprd_i2c_remove(struct platform_device *pdev)
{
struct sprd_i2c *i2c_dev = platform_get_drvdata(pdev);
int ret;
@@ -586,8 +586,6 @@ static int sprd_i2c_remove(struct platform_device *pdev)
pm_runtime_put_noidle(i2c_dev->dev);
pm_runtime_disable(i2c_dev->dev);
-
- return 0;
}
static int __maybe_unused sprd_i2c_suspend_noirq(struct device *dev)
@@ -645,7 +643,7 @@ MODULE_DEVICE_TABLE(of, sprd_i2c_of_match);
static struct platform_driver sprd_i2c_driver = {
.probe = sprd_i2c_probe,
- .remove = sprd_i2c_remove,
+ .remove_new = sprd_i2c_remove,
.driver = {
.name = "sprd-i2c",
.of_match_table = sprd_i2c_of_match,
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 3bd48d4b6318..db0d1ac82910 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -701,7 +701,7 @@ const struct bus_type i2c_bus_type = {
};
EXPORT_SYMBOL_GPL(i2c_bus_type);
-struct device_type i2c_client_type = {
+const struct device_type i2c_client_type = {
.groups = i2c_dev_groups,
.uevent = i2c_device_uevent,
.release = i2c_client_dev_release,
@@ -1343,7 +1343,7 @@ static struct attribute *i2c_adapter_attrs[] = {
};
ATTRIBUTE_GROUPS(i2c_adapter);
-struct device_type i2c_adapter_type = {
+const struct device_type i2c_adapter_type = {
.groups = i2c_adapter_groups,
.release = i2c_adapter_dev_release,
};
@@ -2200,13 +2200,18 @@ static int i2c_check_for_quirks(struct i2c_adapter *adap, struct i2c_msg *msgs,
* Returns negative errno, else the number of messages executed.
*
* Adapter lock must be held when calling this function. No debug logging
- * takes place. adap->algo->master_xfer existence isn't checked.
+ * takes place.
*/
int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
unsigned long orig_jiffies;
int ret, try;
+ if (!adap->algo->master_xfer) {
+ dev_dbg(&adap->dev, "I2C level transfers not supported\n");
+ return -EOPNOTSUPP;
+ }
+
if (WARN_ON(!msgs || num < 1))
return -EINVAL;
@@ -2273,11 +2278,6 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
int ret;
- if (!adap->algo->master_xfer) {
- dev_dbg(&adap->dev, "I2C level transfers not supported\n");
- return -EOPNOTSUPP;
- }
-
/* REVISIT the fault reporting model here is weak:
*
* - When we get an error after receiving N bytes from a slave,
diff --git a/drivers/i2c/i2c-smbus.c b/drivers/i2c/i2c-smbus.c
index 74807c6db596..97f338b123b1 100644
--- a/drivers/i2c/i2c-smbus.c
+++ b/drivers/i2c/i2c-smbus.c
@@ -351,13 +351,18 @@ void i2c_register_spd(struct i2c_adapter *adap)
if (!dimm_count)
return;
- dev_info(&adap->dev, "%d/%d memory slots populated (from DMI)\n",
- dimm_count, slot_count);
-
- if (slot_count > 8) {
- dev_warn(&adap->dev,
- "Systems with more than 8 memory slots not supported yet, not instantiating SPD\n");
- return;
+ /*
+ * If we're a child adapter on a muxed segment, then limit slots to 8,
+ * as this is the max number of SPD EEPROMs that can be addressed per bus.
+ */
+ if (i2c_parent_is_i2c_adapter(adap)) {
+ slot_count = 8;
+ } else {
+ if (slot_count > 8) {
+ dev_warn(&adap->dev,
+ "More than 8 memory slots on a single bus, contact i801 maintainer to add missing mux config\n");
+ return;
+ }
}
/*
diff --git a/drivers/i2c/muxes/i2c-mux-mlxcpld.c b/drivers/i2c/muxes/i2c-mux-mlxcpld.c
index 3dda00f1df78..4c6ed1d58c79 100644
--- a/drivers/i2c/muxes/i2c-mux-mlxcpld.c
+++ b/drivers/i2c/muxes/i2c-mux-mlxcpld.c
@@ -187,7 +187,7 @@ static struct platform_driver mlxcpld_mux_driver = {
module_platform_driver(mlxcpld_mux_driver);
-MODULE_AUTHOR("Michael Shych (michaels@mellanox.com)");
+MODULE_AUTHOR("Michael Shych <michaels@mellanox.com>");
MODULE_DESCRIPTION("Mellanox I2C-CPLD-MUX driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("platform:i2c-mux-mlxcpld");
diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
index 2219062104fb..c3f4ff08ac38 100644
--- a/drivers/i2c/muxes/i2c-mux-pca954x.c
+++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
@@ -49,6 +49,7 @@
#include <linux/pm.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <dt-bindings/mux/mux.h>
@@ -57,6 +58,20 @@
#define PCA954X_IRQ_OFFSET 4
+/*
+ * MAX7357's configuration register is writeable after POR, but
+ * can be locked by setting the basic mode bit. MAX7358 configuration
+ * register is locked by default and needs to be unlocked first.
+ * The configuration register holds the following settings:
+ */
+#define MAX7357_CONF_INT_ENABLE BIT(0)
+#define MAX7357_CONF_FLUSH_OUT BIT(1)
+#define MAX7357_CONF_RELEASE_INT BIT(2)
+#define MAX7357_CONF_DISCON_SINGLE_CHAN BIT(4)
+#define MAX7357_CONF_PRECONNECT_TEST BIT(7)
+
+#define MAX7357_POR_DEFAULT_CONF MAX7357_CONF_INT_ENABLE
+
enum pca_type {
max_7356,
max_7357,
@@ -102,6 +117,9 @@ struct pca954x {
unsigned int irq_mask;
raw_spinlock_t lock;
struct regulator *supply;
+
+ struct gpio_desc *reset_gpio;
+ struct reset_control *reset_cont;
};
/* Provide specs for the MAX735x, PCA954x and PCA984x types we know about */
@@ -470,13 +488,69 @@ static int pca954x_init(struct i2c_client *client, struct pca954x *data)
else
data->last_chan = 0; /* Disconnect multiplexer */
- ret = i2c_smbus_write_byte(client, data->last_chan);
+ if (device_is_compatible(&client->dev, "maxim,max7357")) {
+ if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
+ u8 conf = MAX7357_POR_DEFAULT_CONF;
+ /*
+ * The interrupt signal is shared with the reset pin. Release the
+ * interrupt after 1.6 seconds to allow using the pin as reset.
+ */
+ conf |= MAX7357_CONF_RELEASE_INT;
+
+ if (device_property_read_bool(&client->dev, "maxim,isolate-stuck-channel"))
+ conf |= MAX7357_CONF_DISCON_SINGLE_CHAN;
+ if (device_property_read_bool(&client->dev,
+ "maxim,send-flush-out-sequence"))
+ conf |= MAX7357_CONF_FLUSH_OUT;
+ if (device_property_read_bool(&client->dev,
+ "maxim,preconnection-wiggle-test-enable"))
+ conf |= MAX7357_CONF_PRECONNECT_TEST;
+
+ ret = i2c_smbus_write_byte_data(client, data->last_chan, conf);
+ } else {
+ dev_warn(&client->dev, "Write byte data not supported."
+ "Cannot enable enhanced mode features\n");
+ ret = i2c_smbus_write_byte(client, data->last_chan);
+ }
+ } else {
+ ret = i2c_smbus_write_byte(client, data->last_chan);
+ }
+
if (ret < 0)
data->last_chan = 0;
return ret;
}
+static int pca954x_get_reset(struct device *dev, struct pca954x *data)
+{
+ data->reset_cont = devm_reset_control_get_optional_shared(dev, NULL);
+ if (IS_ERR(data->reset_cont))
+ return dev_err_probe(dev, PTR_ERR(data->reset_cont),
+ "Failed to get reset\n");
+ else if (data->reset_cont)
+ return 0;
+
+ /*
+ * fallback to legacy reset-gpios
+ */
+ data->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(data->reset_gpio)) {
+ return dev_err_probe(dev, PTR_ERR(data->reset_gpio),
+ "Failed to get reset gpio");
+ }
+
+ return 0;
+}
+
+static void pca954x_reset_deassert(struct pca954x *data)
+{
+ if (data->reset_cont)
+ reset_control_deassert(data->reset_cont);
+ else
+ gpiod_set_value_cansleep(data->reset_gpio, 0);
+}
+
/*
* I2C init/probing/exit functions
*/
@@ -485,7 +559,6 @@ static int pca954x_probe(struct i2c_client *client)
const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct i2c_adapter *adap = client->adapter;
struct device *dev = &client->dev;
- struct gpio_desc *gpio;
struct i2c_mux_core *muxc;
struct pca954x *data;
int num;
@@ -513,15 +586,13 @@ static int pca954x_probe(struct i2c_client *client)
return dev_err_probe(dev, ret,
"Failed to enable vdd supply\n");
- /* Reset the mux if a reset GPIO is specified. */
- gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
- if (IS_ERR(gpio)) {
- ret = PTR_ERR(gpio);
+ ret = pca954x_get_reset(dev, data);
+ if (ret)
goto fail_cleanup;
- }
- if (gpio) {
+
+ if (data->reset_cont || data->reset_gpio) {
udelay(1);
- gpiod_set_value_cansleep(gpio, 0);
+ pca954x_reset_deassert(data);
/* Give the chip some time to recover. */
udelay(1);
}
generated by cgit (git 2.34.1) at 2024-06-21 18:08:55 +0000