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path: root/drivers/mtd/spi-nor/controllers/cadence-quadspi.c
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Diffstat (limited to 'drivers/mtd/spi-nor/controllers/cadence-quadspi.c')
-rw-r--r--drivers/mtd/spi-nor/controllers/cadence-quadspi.c1540
1 files changed, 1540 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/controllers/cadence-quadspi.c b/drivers/mtd/spi-nor/controllers/cadence-quadspi.c
new file mode 100644
index 000000000000..494dcab4aaaa
--- /dev/null
+++ b/drivers/mtd/spi-nor/controllers/cadence-quadspi.c
@@ -0,0 +1,1540 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Cadence QSPI Controller
+ *
+ * Copyright Altera Corporation (C) 2012-2014. All rights reserved.
+ */
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/spi-nor.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+#include <linux/sched.h>
+#include <linux/spi/spi.h>
+#include <linux/timer.h>
+
+#define CQSPI_NAME "cadence-qspi"
+#define CQSPI_MAX_CHIPSELECT 16
+
+/* Quirks */
+#define CQSPI_NEEDS_WR_DELAY BIT(0)
+
+/* Capabilities mask */
+#define CQSPI_BASE_HWCAPS_MASK \
+ (SNOR_HWCAPS_READ | SNOR_HWCAPS_READ_FAST | \
+ SNOR_HWCAPS_READ_1_1_2 | SNOR_HWCAPS_READ_1_1_4 | \
+ SNOR_HWCAPS_PP)
+
+struct cqspi_st;
+
+struct cqspi_flash_pdata {
+ struct spi_nor nor;
+ struct cqspi_st *cqspi;
+ u32 clk_rate;
+ u32 read_delay;
+ u32 tshsl_ns;
+ u32 tsd2d_ns;
+ u32 tchsh_ns;
+ u32 tslch_ns;
+ u8 inst_width;
+ u8 addr_width;
+ u8 data_width;
+ u8 cs;
+ bool registered;
+ bool use_direct_mode;
+};
+
+struct cqspi_st {
+ struct platform_device *pdev;
+
+ struct clk *clk;
+ unsigned int sclk;
+
+ void __iomem *iobase;
+ void __iomem *ahb_base;
+ resource_size_t ahb_size;
+ struct completion transfer_complete;
+ struct mutex bus_mutex;
+
+ struct dma_chan *rx_chan;
+ struct completion rx_dma_complete;
+ dma_addr_t mmap_phys_base;
+
+ int current_cs;
+ int current_page_size;
+ int current_erase_size;
+ int current_addr_width;
+ unsigned long master_ref_clk_hz;
+ bool is_decoded_cs;
+ u32 fifo_depth;
+ u32 fifo_width;
+ bool rclk_en;
+ u32 trigger_address;
+ u32 wr_delay;
+ struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT];
+};
+
+struct cqspi_driver_platdata {
+ u32 hwcaps_mask;
+ u8 quirks;
+};
+
+/* Operation timeout value */
+#define CQSPI_TIMEOUT_MS 500
+#define CQSPI_READ_TIMEOUT_MS 10
+
+/* Instruction type */
+#define CQSPI_INST_TYPE_SINGLE 0
+#define CQSPI_INST_TYPE_DUAL 1
+#define CQSPI_INST_TYPE_QUAD 2
+#define CQSPI_INST_TYPE_OCTAL 3
+
+#define CQSPI_DUMMY_CLKS_PER_BYTE 8
+#define CQSPI_DUMMY_BYTES_MAX 4
+#define CQSPI_DUMMY_CLKS_MAX 31
+
+#define CQSPI_STIG_DATA_LEN_MAX 8
+
+/* Register map */
+#define CQSPI_REG_CONFIG 0x00
+#define CQSPI_REG_CONFIG_ENABLE_MASK BIT(0)
+#define CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL BIT(7)
+#define CQSPI_REG_CONFIG_DECODE_MASK BIT(9)
+#define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10
+#define CQSPI_REG_CONFIG_DMA_MASK BIT(15)
+#define CQSPI_REG_CONFIG_BAUD_LSB 19
+#define CQSPI_REG_CONFIG_IDLE_LSB 31
+#define CQSPI_REG_CONFIG_CHIPSELECT_MASK 0xF
+#define CQSPI_REG_CONFIG_BAUD_MASK 0xF
+
+#define CQSPI_REG_RD_INSTR 0x04
+#define CQSPI_REG_RD_INSTR_OPCODE_LSB 0
+#define CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB 8
+#define CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB 12
+#define CQSPI_REG_RD_INSTR_TYPE_DATA_LSB 16
+#define CQSPI_REG_RD_INSTR_MODE_EN_LSB 20
+#define CQSPI_REG_RD_INSTR_DUMMY_LSB 24
+#define CQSPI_REG_RD_INSTR_TYPE_INSTR_MASK 0x3
+#define CQSPI_REG_RD_INSTR_TYPE_ADDR_MASK 0x3
+#define CQSPI_REG_RD_INSTR_TYPE_DATA_MASK 0x3
+#define CQSPI_REG_RD_INSTR_DUMMY_MASK 0x1F
+
+#define CQSPI_REG_WR_INSTR 0x08
+#define CQSPI_REG_WR_INSTR_OPCODE_LSB 0
+#define CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB 12
+#define CQSPI_REG_WR_INSTR_TYPE_DATA_LSB 16
+
+#define CQSPI_REG_DELAY 0x0C
+#define CQSPI_REG_DELAY_TSLCH_LSB 0
+#define CQSPI_REG_DELAY_TCHSH_LSB 8
+#define CQSPI_REG_DELAY_TSD2D_LSB 16
+#define CQSPI_REG_DELAY_TSHSL_LSB 24
+#define CQSPI_REG_DELAY_TSLCH_MASK 0xFF
+#define CQSPI_REG_DELAY_TCHSH_MASK 0xFF
+#define CQSPI_REG_DELAY_TSD2D_MASK 0xFF
+#define CQSPI_REG_DELAY_TSHSL_MASK 0xFF
+
+#define CQSPI_REG_READCAPTURE 0x10
+#define CQSPI_REG_READCAPTURE_BYPASS_LSB 0
+#define CQSPI_REG_READCAPTURE_DELAY_LSB 1
+#define CQSPI_REG_READCAPTURE_DELAY_MASK 0xF
+
+#define CQSPI_REG_SIZE 0x14
+#define CQSPI_REG_SIZE_ADDRESS_LSB 0
+#define CQSPI_REG_SIZE_PAGE_LSB 4
+#define CQSPI_REG_SIZE_BLOCK_LSB 16
+#define CQSPI_REG_SIZE_ADDRESS_MASK 0xF
+#define CQSPI_REG_SIZE_PAGE_MASK 0xFFF
+#define CQSPI_REG_SIZE_BLOCK_MASK 0x3F
+
+#define CQSPI_REG_SRAMPARTITION 0x18
+#define CQSPI_REG_INDIRECTTRIGGER 0x1C
+
+#define CQSPI_REG_DMA 0x20
+#define CQSPI_REG_DMA_SINGLE_LSB 0
+#define CQSPI_REG_DMA_BURST_LSB 8
+#define CQSPI_REG_DMA_SINGLE_MASK 0xFF
+#define CQSPI_REG_DMA_BURST_MASK 0xFF
+
+#define CQSPI_REG_REMAP 0x24
+#define CQSPI_REG_MODE_BIT 0x28
+
+#define CQSPI_REG_SDRAMLEVEL 0x2C
+#define CQSPI_REG_SDRAMLEVEL_RD_LSB 0
+#define CQSPI_REG_SDRAMLEVEL_WR_LSB 16
+#define CQSPI_REG_SDRAMLEVEL_RD_MASK 0xFFFF
+#define CQSPI_REG_SDRAMLEVEL_WR_MASK 0xFFFF
+
+#define CQSPI_REG_IRQSTATUS 0x40
+#define CQSPI_REG_IRQMASK 0x44
+
+#define CQSPI_REG_INDIRECTRD 0x60
+#define CQSPI_REG_INDIRECTRD_START_MASK BIT(0)
+#define CQSPI_REG_INDIRECTRD_CANCEL_MASK BIT(1)
+#define CQSPI_REG_INDIRECTRD_DONE_MASK BIT(5)
+
+#define CQSPI_REG_INDIRECTRDWATERMARK 0x64
+#define CQSPI_REG_INDIRECTRDSTARTADDR 0x68
+#define CQSPI_REG_INDIRECTRDBYTES 0x6C
+
+#define CQSPI_REG_CMDCTRL 0x90
+#define CQSPI_REG_CMDCTRL_EXECUTE_MASK BIT(0)
+#define CQSPI_REG_CMDCTRL_INPROGRESS_MASK BIT(1)
+#define CQSPI_REG_CMDCTRL_WR_BYTES_LSB 12
+#define CQSPI_REG_CMDCTRL_WR_EN_LSB 15
+#define CQSPI_REG_CMDCTRL_ADD_BYTES_LSB 16
+#define CQSPI_REG_CMDCTRL_ADDR_EN_LSB 19
+#define CQSPI_REG_CMDCTRL_RD_BYTES_LSB 20
+#define CQSPI_REG_CMDCTRL_RD_EN_LSB 23
+#define CQSPI_REG_CMDCTRL_OPCODE_LSB 24
+#define CQSPI_REG_CMDCTRL_WR_BYTES_MASK 0x7
+#define CQSPI_REG_CMDCTRL_ADD_BYTES_MASK 0x3
+#define CQSPI_REG_CMDCTRL_RD_BYTES_MASK 0x7
+
+#define CQSPI_REG_INDIRECTWR 0x70
+#define CQSPI_REG_INDIRECTWR_START_MASK BIT(0)
+#define CQSPI_REG_INDIRECTWR_CANCEL_MASK BIT(1)
+#define CQSPI_REG_INDIRECTWR_DONE_MASK BIT(5)
+
+#define CQSPI_REG_INDIRECTWRWATERMARK 0x74
+#define CQSPI_REG_INDIRECTWRSTARTADDR 0x78
+#define CQSPI_REG_INDIRECTWRBYTES 0x7C
+
+#define CQSPI_REG_CMDADDRESS 0x94
+#define CQSPI_REG_CMDREADDATALOWER 0xA0
+#define CQSPI_REG_CMDREADDATAUPPER 0xA4
+#define CQSPI_REG_CMDWRITEDATALOWER 0xA8
+#define CQSPI_REG_CMDWRITEDATAUPPER 0xAC
+
+/* Interrupt status bits */
+#define CQSPI_REG_IRQ_MODE_ERR BIT(0)
+#define CQSPI_REG_IRQ_UNDERFLOW BIT(1)
+#define CQSPI_REG_IRQ_IND_COMP BIT(2)
+#define CQSPI_REG_IRQ_IND_RD_REJECT BIT(3)
+#define CQSPI_REG_IRQ_WR_PROTECTED_ERR BIT(4)
+#define CQSPI_REG_IRQ_ILLEGAL_AHB_ERR BIT(5)
+#define CQSPI_REG_IRQ_WATERMARK BIT(6)
+#define CQSPI_REG_IRQ_IND_SRAM_FULL BIT(12)
+
+#define CQSPI_IRQ_MASK_RD (CQSPI_REG_IRQ_WATERMARK | \
+ CQSPI_REG_IRQ_IND_SRAM_FULL | \
+ CQSPI_REG_IRQ_IND_COMP)
+
+#define CQSPI_IRQ_MASK_WR (CQSPI_REG_IRQ_IND_COMP | \
+ CQSPI_REG_IRQ_WATERMARK | \
+ CQSPI_REG_IRQ_UNDERFLOW)
+
+#define CQSPI_IRQ_STATUS_MASK 0x1FFFF
+
+static int cqspi_wait_for_bit(void __iomem *reg, const u32 mask, bool clr)
+{
+ u32 val;
+
+ return readl_relaxed_poll_timeout(reg, val,
+ (((clr ? ~val : val) & mask) == mask),
+ 10, CQSPI_TIMEOUT_MS * 1000);
+}
+
+static bool cqspi_is_idle(struct cqspi_st *cqspi)
+{
+ u32 reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
+
+ return reg & (1 << CQSPI_REG_CONFIG_IDLE_LSB);
+}
+
+static u32 cqspi_get_rd_sram_level(struct cqspi_st *cqspi)
+{
+ u32 reg = readl(cqspi->iobase + CQSPI_REG_SDRAMLEVEL);
+
+ reg >>= CQSPI_REG_SDRAMLEVEL_RD_LSB;
+ return reg & CQSPI_REG_SDRAMLEVEL_RD_MASK;
+}
+
+static irqreturn_t cqspi_irq_handler(int this_irq, void *dev)
+{
+ struct cqspi_st *cqspi = dev;
+ unsigned int irq_status;
+
+ /* Read interrupt status */
+ irq_status = readl(cqspi->iobase + CQSPI_REG_IRQSTATUS);
+
+ /* Clear interrupt */
+ writel(irq_status, cqspi->iobase + CQSPI_REG_IRQSTATUS);
+
+ irq_status &= CQSPI_IRQ_MASK_RD | CQSPI_IRQ_MASK_WR;
+
+ if (irq_status)
+ complete(&cqspi->transfer_complete);
+
+ return IRQ_HANDLED;
+}
+
+static unsigned int cqspi_calc_rdreg(struct spi_nor *nor)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ u32 rdreg = 0;
+
+ rdreg |= f_pdata->inst_width << CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB;
+ rdreg |= f_pdata->addr_width << CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB;
+ rdreg |= f_pdata->data_width << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB;
+
+ return rdreg;
+}
+
+static int cqspi_wait_idle(struct cqspi_st *cqspi)
+{
+ const unsigned int poll_idle_retry = 3;
+ unsigned int count = 0;
+ unsigned long timeout;
+
+ timeout = jiffies + msecs_to_jiffies(CQSPI_TIMEOUT_MS);
+ while (1) {
+ /*
+ * Read few times in succession to ensure the controller
+ * is indeed idle, that is, the bit does not transition
+ * low again.
+ */
+ if (cqspi_is_idle(cqspi))
+ count++;
+ else
+ count = 0;
+
+ if (count >= poll_idle_retry)
+ return 0;
+
+ if (time_after(jiffies, timeout)) {
+ /* Timeout, in busy mode. */
+ dev_err(&cqspi->pdev->dev,
+ "QSPI is still busy after %dms timeout.\n",
+ CQSPI_TIMEOUT_MS);
+ return -ETIMEDOUT;
+ }
+
+ cpu_relax();
+ }
+}
+
+static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ int ret;
+
+ /* Write the CMDCTRL without start execution. */
+ writel(reg, reg_base + CQSPI_REG_CMDCTRL);
+ /* Start execute */
+ reg |= CQSPI_REG_CMDCTRL_EXECUTE_MASK;
+ writel(reg, reg_base + CQSPI_REG_CMDCTRL);
+
+ /* Polling for completion. */
+ ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_CMDCTRL,
+ CQSPI_REG_CMDCTRL_INPROGRESS_MASK, 1);
+ if (ret) {
+ dev_err(&cqspi->pdev->dev,
+ "Flash command execution timed out.\n");
+ return ret;
+ }
+
+ /* Polling QSPI idle status. */
+ return cqspi_wait_idle(cqspi);
+}
+
+static int cqspi_command_read(struct spi_nor *nor, u8 opcode,
+ u8 *rxbuf, size_t n_rx)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int rdreg;
+ unsigned int reg;
+ size_t read_len;
+ int status;
+
+ if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) {
+ dev_err(nor->dev,
+ "Invalid input argument, len %zu rxbuf 0x%p\n",
+ n_rx, rxbuf);
+ return -EINVAL;
+ }
+
+ reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+
+ rdreg = cqspi_calc_rdreg(nor);
+ writel(rdreg, reg_base + CQSPI_REG_RD_INSTR);
+
+ reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB);
+
+ /* 0 means 1 byte. */
+ reg |= (((n_rx - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_RD_BYTES_LSB);
+ status = cqspi_exec_flash_cmd(cqspi, reg);
+ if (status)
+ return status;
+
+ reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER);
+
+ /* Put the read value into rx_buf */
+ read_len = (n_rx > 4) ? 4 : n_rx;
+ memcpy(rxbuf, &reg, read_len);
+ rxbuf += read_len;
+
+ if (n_rx > 4) {
+ reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER);
+
+ read_len = n_rx - read_len;
+ memcpy(rxbuf, &reg, read_len);
+ }
+
+ return 0;
+}
+
+static int cqspi_command_write(struct spi_nor *nor, const u8 opcode,
+ const u8 *txbuf, size_t n_tx)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int reg;
+ unsigned int data;
+ size_t write_len;
+ int ret;
+
+ if (n_tx > CQSPI_STIG_DATA_LEN_MAX || (n_tx && !txbuf)) {
+ dev_err(nor->dev,
+ "Invalid input argument, cmdlen %zu txbuf 0x%p\n",
+ n_tx, txbuf);
+ return -EINVAL;
+ }
+
+ reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+ if (n_tx) {
+ reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB);
+ reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_WR_BYTES_LSB;
+ data = 0;
+ write_len = (n_tx > 4) ? 4 : n_tx;
+ memcpy(&data, txbuf, write_len);
+ txbuf += write_len;
+ writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER);
+
+ if (n_tx > 4) {
+ data = 0;
+ write_len = n_tx - 4;
+ memcpy(&data, txbuf, write_len);
+ writel(data, reg_base + CQSPI_REG_CMDWRITEDATAUPPER);
+ }
+ }
+ ret = cqspi_exec_flash_cmd(cqspi, reg);
+ return ret;
+}
+
+static int cqspi_command_write_addr(struct spi_nor *nor,
+ const u8 opcode, const unsigned int addr)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int reg;
+
+ reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB;
+ reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
+ reg |= ((nor->addr_width - 1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
+ << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
+
+ writel(addr, reg_base + CQSPI_REG_CMDADDRESS);
+
+ return cqspi_exec_flash_cmd(cqspi, reg);
+}
+
+static int cqspi_read_setup(struct spi_nor *nor)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int dummy_clk = 0;
+ unsigned int reg;
+
+ reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB;
+ reg |= cqspi_calc_rdreg(nor);
+
+ /* Setup dummy clock cycles */
+ dummy_clk = nor->read_dummy;
+ if (dummy_clk > CQSPI_DUMMY_CLKS_MAX)
+ dummy_clk = CQSPI_DUMMY_CLKS_MAX;
+
+ if (dummy_clk / 8) {
+ reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB);
+ /* Set mode bits high to ensure chip doesn't enter XIP */
+ writel(0xFF, reg_base + CQSPI_REG_MODE_BIT);
+
+ /* Need to subtract the mode byte (8 clocks). */
+ if (f_pdata->inst_width != CQSPI_INST_TYPE_QUAD)
+ dummy_clk -= 8;
+
+ if (dummy_clk)
+ reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK)
+ << CQSPI_REG_RD_INSTR_DUMMY_LSB;
+ }
+
+ writel(reg, reg_base + CQSPI_REG_RD_INSTR);
+
+ /* Set address width */
+ reg = readl(reg_base + CQSPI_REG_SIZE);
+ reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+ reg |= (nor->addr_width - 1);
+ writel(reg, reg_base + CQSPI_REG_SIZE);
+ return 0;
+}
+
+static int cqspi_indirect_read_execute(struct spi_nor *nor, u8 *rxbuf,
+ loff_t from_addr, const size_t n_rx)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+ void __iomem *ahb_base = cqspi->ahb_base;
+ unsigned int remaining = n_rx;
+ unsigned int mod_bytes = n_rx % 4;
+ unsigned int bytes_to_read = 0;
+ u8 *rxbuf_end = rxbuf + n_rx;
+ int ret = 0;
+
+ writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR);
+ writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES);
+
+ /* Clear all interrupts. */
+ writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
+
+ writel(CQSPI_IRQ_MASK_RD, reg_base + CQSPI_REG_IRQMASK);
+
+ reinit_completion(&cqspi->transfer_complete);
+ writel(CQSPI_REG_INDIRECTRD_START_MASK,
+ reg_base + CQSPI_REG_INDIRECTRD);
+
+ while (remaining > 0) {
+ if (!wait_for_completion_timeout(&cqspi->transfer_complete,
+ msecs_to_jiffies(CQSPI_READ_TIMEOUT_MS)))
+ ret = -ETIMEDOUT;
+
+ bytes_to_read = cqspi_get_rd_sram_level(cqspi);
+
+ if (ret && bytes_to_read == 0) {
+ dev_err(nor->dev, "Indirect read timeout, no bytes\n");
+ goto failrd;
+ }
+
+ while (bytes_to_read != 0) {
+ unsigned int word_remain = round_down(remaining, 4);
+
+ bytes_to_read *= cqspi->fifo_width;
+ bytes_to_read = bytes_to_read > remaining ?
+ remaining : bytes_to_read;
+ bytes_to_read = round_down(bytes_to_read, 4);
+ /* Read 4 byte word chunks then single bytes */
+ if (bytes_to_read) {
+ ioread32_rep(ahb_base, rxbuf,
+ (bytes_to_read / 4));
+ } else if (!word_remain && mod_bytes) {
+ unsigned int temp = ioread32(ahb_base);
+
+ bytes_to_read = mod_bytes;
+ memcpy(rxbuf, &temp, min((unsigned int)
+ (rxbuf_end - rxbuf),
+ bytes_to_read));
+ }
+ rxbuf += bytes_to_read;
+ remaining -= bytes_to_read;
+ bytes_to_read = cqspi_get_rd_sram_level(cqspi);
+ }
+
+ if (remaining > 0)
+ reinit_completion(&cqspi->transfer_complete);
+ }
+
+ /* Check indirect done status */
+ ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTRD,
+ CQSPI_REG_INDIRECTRD_DONE_MASK, 0);
+ if (ret) {
+ dev_err(nor->dev,
+ "Indirect read completion error (%i)\n", ret);
+ goto failrd;
+ }
+
+ /* Disable interrupt */
+ writel(0, reg_base + CQSPI_REG_IRQMASK);
+
+ /* Clear indirect completion status */
+ writel(CQSPI_REG_INDIRECTRD_DONE_MASK, reg_base + CQSPI_REG_INDIRECTRD);
+
+ return 0;
+
+failrd:
+ /* Disable interrupt */
+ writel(0, reg_base + CQSPI_REG_IRQMASK);
+
+ /* Cancel the indirect read */
+ writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
+ reg_base + CQSPI_REG_INDIRECTRD);
+ return ret;
+}
+
+static int cqspi_write_setup(struct spi_nor *nor)
+{
+ unsigned int reg;
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+
+ /* Set opcode. */
+ reg = nor->program_opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB;
+ writel(reg, reg_base + CQSPI_REG_WR_INSTR);
+ reg = cqspi_calc_rdreg(nor);
+ writel(reg, reg_base + CQSPI_REG_RD_INSTR);
+
+ reg = readl(reg_base + CQSPI_REG_SIZE);
+ reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+ reg |= (nor->addr_width - 1);
+ writel(reg, reg_base + CQSPI_REG_SIZE);
+ return 0;
+}
+
+static int cqspi_indirect_write_execute(struct spi_nor *nor, loff_t to_addr,
+ const u8 *txbuf, const size_t n_tx)
+{
+ const unsigned int page_size = nor->page_size;
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int remaining = n_tx;
+ unsigned int write_bytes;
+ int ret;
+
+ writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR);
+ writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES);
+
+ /* Clear all interrupts. */
+ writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS);
+
+ writel(CQSPI_IRQ_MASK_WR, reg_base + CQSPI_REG_IRQMASK);
+
+ reinit_completion(&cqspi->transfer_complete);
+ writel(CQSPI_REG_INDIRECTWR_START_MASK,
+ reg_base + CQSPI_REG_INDIRECTWR);
+ /*
+ * As per 66AK2G02 TRM SPRUHY8F section 11.15.5.3 Indirect Access
+ * Controller programming sequence, couple of cycles of
+ * QSPI_REF_CLK delay is required for the above bit to
+ * be internally synchronized by the QSPI module. Provide 5
+ * cycles of delay.
+ */
+ if (cqspi->wr_delay)
+ ndelay(cqspi->wr_delay);
+
+ while (remaining > 0) {
+ size_t write_words, mod_bytes;
+
+ write_bytes = remaining > page_size ? page_size : remaining;
+ write_words = write_bytes / 4;
+ mod_bytes = write_bytes % 4;
+ /* Write 4 bytes at a time then single bytes. */
+ if (write_words) {
+ iowrite32_rep(cqspi->ahb_base, txbuf, write_words);
+ txbuf += (write_words * 4);
+ }
+ if (mod_bytes) {
+ unsigned int temp = 0xFFFFFFFF;
+
+ memcpy(&temp, txbuf, mod_bytes);
+ iowrite32(temp, cqspi->ahb_base);
+ txbuf += mod_bytes;
+ }
+
+ if (!wait_for_completion_timeout(&cqspi->transfer_complete,
+ msecs_to_jiffies(CQSPI_TIMEOUT_MS))) {
+ dev_err(nor->dev, "Indirect write timeout\n");
+ ret = -ETIMEDOUT;
+ goto failwr;
+ }
+
+ remaining -= write_bytes;
+
+ if (remaining > 0)
+ reinit_completion(&cqspi->transfer_complete);
+ }
+
+ /* Check indirect done status */
+ ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTWR,
+ CQSPI_REG_INDIRECTWR_DONE_MASK, 0);
+ if (ret) {
+ dev_err(nor->dev,
+ "Indirect write completion error (%i)\n", ret);
+ goto failwr;
+ }
+
+ /* Disable interrupt. */
+ writel(0, reg_base + CQSPI_REG_IRQMASK);
+
+ /* Clear indirect completion status */
+ writel(CQSPI_REG_INDIRECTWR_DONE_MASK, reg_base + CQSPI_REG_INDIRECTWR);
+
+ cqspi_wait_idle(cqspi);
+
+ return 0;
+
+failwr:
+ /* Disable interrupt. */
+ writel(0, reg_base + CQSPI_REG_IRQMASK);
+
+ /* Cancel the indirect write */
+ writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK,
+ reg_base + CQSPI_REG_INDIRECTWR);
+ return ret;
+}
+
+static void cqspi_chipselect(struct spi_nor *nor)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int chip_select = f_pdata->cs;
+ unsigned int reg;
+
+ reg = readl(reg_base + CQSPI_REG_CONFIG);
+ if (cqspi->is_decoded_cs) {
+ reg |= CQSPI_REG_CONFIG_DECODE_MASK;
+ } else {
+ reg &= ~CQSPI_REG_CONFIG_DECODE_MASK;
+
+ /* Convert CS if without decoder.
+ * CS0 to 4b'1110
+ * CS1 to 4b'1101
+ * CS2 to 4b'1011
+ * CS3 to 4b'0111
+ */
+ chip_select = 0xF & ~(1 << chip_select);
+ }
+
+ reg &= ~(CQSPI_REG_CONFIG_CHIPSELECT_MASK
+ << CQSPI_REG_CONFIG_CHIPSELECT_LSB);
+ reg |= (chip_select & CQSPI_REG_CONFIG_CHIPSELECT_MASK)
+ << CQSPI_REG_CONFIG_CHIPSELECT_LSB;
+ writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_configure_cs_and_sizes(struct spi_nor *nor)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *iobase = cqspi->iobase;
+ unsigned int reg;
+
+ /* configure page size and block size. */
+ reg = readl(iobase + CQSPI_REG_SIZE);
+ reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB);
+ reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB);
+ reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
+ reg |= (nor->page_size << CQSPI_REG_SIZE_PAGE_LSB);
+ reg |= (ilog2(nor->mtd.erasesize) << CQSPI_REG_SIZE_BLOCK_LSB);
+ reg |= (nor->addr_width - 1);
+ writel(reg, iobase + CQSPI_REG_SIZE);
+
+ /* configure the chip select */
+ cqspi_chipselect(nor);
+
+ /* Store the new configuration of the controller */
+ cqspi->current_page_size = nor->page_size;
+ cqspi->current_erase_size = nor->mtd.erasesize;
+ cqspi->current_addr_width = nor->addr_width;
+}
+
+static unsigned int calculate_ticks_for_ns(const unsigned int ref_clk_hz,
+ const unsigned int ns_val)
+{
+ unsigned int ticks;
+
+ ticks = ref_clk_hz / 1000; /* kHz */
+ ticks = DIV_ROUND_UP(ticks * ns_val, 1000000);
+
+ return ticks;
+}
+
+static void cqspi_delay(struct spi_nor *nor)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ void __iomem *iobase = cqspi->iobase;
+ const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz;
+ unsigned int tshsl, tchsh, tslch, tsd2d;
+ unsigned int reg;
+ unsigned int tsclk;
+
+ /* calculate the number of ref ticks for one sclk tick */
+ tsclk = DIV_ROUND_UP(ref_clk_hz, cqspi->sclk);
+
+ tshsl = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tshsl_ns);
+ /* this particular value must be at least one sclk */
+ if (tshsl < tsclk)
+ tshsl = tsclk;
+
+ tchsh = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tchsh_ns);
+ tslch = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tslch_ns);
+ tsd2d = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tsd2d_ns);
+
+ reg = (tshsl & CQSPI_REG_DELAY_TSHSL_MASK)
+ << CQSPI_REG_DELAY_TSHSL_LSB;
+ reg |= (tchsh & CQSPI_REG_DELAY_TCHSH_MASK)
+ << CQSPI_REG_DELAY_TCHSH_LSB;
+ reg |= (tslch & CQSPI_REG_DELAY_TSLCH_MASK)
+ << CQSPI_REG_DELAY_TSLCH_LSB;
+ reg |= (tsd2d & CQSPI_REG_DELAY_TSD2D_MASK)
+ << CQSPI_REG_DELAY_TSD2D_LSB;
+ writel(reg, iobase + CQSPI_REG_DELAY);
+}
+
+static void cqspi_config_baudrate_div(struct cqspi_st *cqspi)
+{
+ const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz;
+ void __iomem *reg_base = cqspi->iobase;
+ u32 reg, div;
+
+ /* Recalculate the baudrate divisor based on QSPI specification. */
+ div = DIV_ROUND_UP(ref_clk_hz, 2 * cqspi->sclk) - 1;
+
+ reg = readl(reg_base + CQSPI_REG_CONFIG);
+ reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB);
+ reg |= (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB;
+ writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_readdata_capture(struct cqspi_st *cqspi,
+ const bool bypass,
+ const unsigned int delay)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int reg;
+
+ reg = readl(reg_base + CQSPI_REG_READCAPTURE);
+
+ if (bypass)
+ reg |= (1 << CQSPI_REG_READCAPTURE_BYPASS_LSB);
+ else
+ reg &= ~(1 << CQSPI_REG_READCAPTURE_BYPASS_LSB);
+
+ reg &= ~(CQSPI_REG_READCAPTURE_DELAY_MASK
+ << CQSPI_REG_READCAPTURE_DELAY_LSB);
+
+ reg |= (delay & CQSPI_REG_READCAPTURE_DELAY_MASK)
+ << CQSPI_REG_READCAPTURE_DELAY_LSB;
+
+ writel(reg, reg_base + CQSPI_REG_READCAPTURE);
+}
+
+static void cqspi_controller_enable(struct cqspi_st *cqspi, bool enable)
+{
+ void __iomem *reg_base = cqspi->iobase;
+ unsigned int reg;
+
+ reg = readl(reg_base + CQSPI_REG_CONFIG);
+
+ if (enable)
+ reg |= CQSPI_REG_CONFIG_ENABLE_MASK;
+ else
+ reg &= ~CQSPI_REG_CONFIG_ENABLE_MASK;
+
+ writel(reg, reg_base + CQSPI_REG_CONFIG);
+}
+
+static void cqspi_configure(struct spi_nor *nor)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ const unsigned int sclk = f_pdata->clk_rate;
+ int switch_cs = (cqspi->current_cs != f_pdata->cs);
+ int switch_ck = (cqspi->sclk != sclk);
+
+ if ((cqspi->current_page_size != nor->page_size) ||
+ (cqspi->current_erase_size != nor->mtd.erasesize) ||
+ (cqspi->current_addr_width != nor->addr_width))
+ switch_cs = 1;
+
+ if (switch_cs || switch_ck)
+ cqspi_controller_enable(cqspi, 0);
+
+ /* Switch chip select. */
+ if (switch_cs) {
+ cqspi->current_cs = f_pdata->cs;
+ cqspi_configure_cs_and_sizes(nor);
+ }
+
+ /* Setup baudrate divisor and delays */
+ if (switch_ck) {
+ cqspi->sclk = sclk;
+ cqspi_config_baudrate_div(cqspi);
+ cqspi_delay(nor);
+ cqspi_readdata_capture(cqspi, !cqspi->rclk_en,
+ f_pdata->read_delay);
+ }
+
+ if (switch_cs || switch_ck)
+ cqspi_controller_enable(cqspi, 1);
+}
+
+static int cqspi_set_protocol(struct spi_nor *nor, const int read)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+
+ f_pdata->inst_width = CQSPI_INST_TYPE_SINGLE;
+ f_pdata->addr_width = CQSPI_INST_TYPE_SINGLE;
+ f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
+
+ if (read) {
+ switch (nor->read_proto) {
+ case SNOR_PROTO_1_1_1:
+ f_pdata->data_width = CQSPI_INST_TYPE_SINGLE;
+ break;
+ case SNOR_PROTO_1_1_2:
+ f_pdata->data_width = CQSPI_INST_TYPE_DUAL;
+ break;
+ case SNOR_PROTO_1_1_4:
+ f_pdata->data_width = CQSPI_INST_TYPE_QUAD;
+ break;
+ case SNOR_PROTO_1_1_8:
+ f_pdata->data_width = CQSPI_INST_TYPE_OCTAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ cqspi_configure(nor);
+
+ return 0;
+}
+
+static ssize_t cqspi_write(struct spi_nor *nor, loff_t to,
+ size_t len, const u_char *buf)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ int ret;
+
+ ret = cqspi_set_protocol(nor, 0);
+ if (ret)
+ return ret;
+
+ ret = cqspi_write_setup(nor);
+ if (ret)
+ return ret;
+
+ if (f_pdata->use_direct_mode) {
+ memcpy_toio(cqspi->ahb_base + to, buf, len);
+ ret = cqspi_wait_idle(cqspi);
+ } else {
+ ret = cqspi_indirect_write_execute(nor, to, buf, len);
+ }
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static void cqspi_rx_dma_callback(void *param)
+{
+ struct cqspi_st *cqspi = param;
+
+ complete(&cqspi->rx_dma_complete);
+}
+
+static int cqspi_direct_read_execute(struct spi_nor *nor, u_char *buf,
+ loff_t from, size_t len)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+ enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
+ dma_addr_t dma_src = (dma_addr_t)cqspi->mmap_phys_base + from;
+ int ret = 0;
+ struct dma_async_tx_descriptor *tx;
+ dma_cookie_t cookie;
+ dma_addr_t dma_dst;
+
+ if (!cqspi->rx_chan || !virt_addr_valid(buf)) {
+ memcpy_fromio(buf, cqspi->ahb_base + from, len);
+ return 0;
+ }
+
+ dma_dst = dma_map_single(nor->dev, buf, len, DMA_FROM_DEVICE);
+ if (dma_mapping_error(nor->dev, dma_dst)) {
+ dev_err(nor->dev, "dma mapping failed\n");
+ return -ENOMEM;
+ }
+ tx = dmaengine_prep_dma_memcpy(cqspi->rx_chan, dma_dst, dma_src,
+ len, flags);
+ if (!tx) {
+ dev_err(nor->dev, "device_prep_dma_memcpy error\n");
+ ret = -EIO;
+ goto err_unmap;
+ }
+
+ tx->callback = cqspi_rx_dma_callback;
+ tx->callback_param = cqspi;
+ cookie = tx->tx_submit(tx);
+ reinit_completion(&cqspi->rx_dma_complete);
+
+ ret = dma_submit_error(cookie);
+ if (ret) {
+ dev_err(nor->dev, "dma_submit_error %d\n", cookie);
+ ret = -EIO;
+ goto err_unmap;
+ }
+
+ dma_async_issue_pending(cqspi->rx_chan);
+ if (!wait_for_completion_timeout(&cqspi->rx_dma_complete,
+ msecs_to_jiffies(len))) {
+ dmaengine_terminate_sync(cqspi->rx_chan);
+ dev_err(nor->dev, "DMA wait_for_completion_timeout\n");
+ ret = -ETIMEDOUT;
+ goto err_unmap;
+ }
+
+err_unmap:
+ dma_unmap_single(nor->dev, dma_dst, len, DMA_FROM_DEVICE);
+
+ return ret;
+}
+
+static ssize_t cqspi_read(struct spi_nor *nor, loff_t from,
+ size_t len, u_char *buf)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ int ret;
+
+ ret = cqspi_set_protocol(nor, 1);
+ if (ret)
+ return ret;
+
+ ret = cqspi_read_setup(nor);
+ if (ret)
+ return ret;
+
+ if (f_pdata->use_direct_mode)
+ ret = cqspi_direct_read_execute(nor, buf, from, len);
+ else
+ ret = cqspi_indirect_read_execute(nor, buf, from, len);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static int cqspi_erase(struct spi_nor *nor, loff_t offs)
+{
+ int ret;
+
+ ret = cqspi_set_protocol(nor, 0);
+ if (ret)
+ return ret;
+
+ /* Send write enable, then erase commands. */
+ ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
+ if (ret)
+ return ret;
+
+ /* Set up command buffer. */
+ ret = cqspi_command_write_addr(nor, nor->erase_opcode, offs);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int cqspi_prep(struct spi_nor *nor)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+
+ mutex_lock(&cqspi->bus_mutex);
+
+ return 0;
+}
+
+static void cqspi_unprep(struct spi_nor *nor)
+{
+ struct cqspi_flash_pdata *f_pdata = nor->priv;
+ struct cqspi_st *cqspi = f_pdata->cqspi;
+
+ mutex_unlock(&cqspi->bus_mutex);
+}
+
+static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, size_t len)
+{
+ int ret;
+
+ ret = cqspi_set_protocol(nor, 0);
+ if (!ret)
+ ret = cqspi_command_read(nor, opcode, buf, len);
+
+ return ret;
+}
+
+static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
+ size_t len)
+{
+ int ret;
+
+ ret = cqspi_set_protocol(nor, 0);
+ if (!ret)
+ ret = cqspi_command_write(nor, opcode, buf, len);
+
+ return ret;
+}
+
+static int cqspi_of_get_flash_pdata(struct platform_device *pdev,
+ struct cqspi_flash_pdata *f_pdata,
+ struct device_node *np)
+{
+ if (of_property_read_u32(np, "cdns,read-delay", &f_pdata->read_delay)) {
+ dev_err(&pdev->dev, "couldn't determine read-delay\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,tshsl-ns", &f_pdata->tshsl_ns)) {
+ dev_err(&pdev->dev, "couldn't determine tshsl-ns\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,tsd2d-ns", &f_pdata->tsd2d_ns)) {
+ dev_err(&pdev->dev, "couldn't determine tsd2d-ns\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,tchsh-ns", &f_pdata->tchsh_ns)) {
+ dev_err(&pdev->dev, "couldn't determine tchsh-ns\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,tslch-ns", &f_pdata->tslch_ns)) {
+ dev_err(&pdev->dev, "couldn't determine tslch-ns\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "spi-max-frequency", &f_pdata->clk_rate)) {
+ dev_err(&pdev->dev, "couldn't determine spi-max-frequency\n");
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+static int cqspi_of_get_pdata(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct cqspi_st *cqspi = platform_get_drvdata(pdev);
+
+ cqspi->is_decoded_cs = of_property_read_bool(np, "cdns,is-decoded-cs");
+
+ if (of_property_read_u32(np, "cdns,fifo-depth", &cqspi->fifo_depth)) {
+ dev_err(&pdev->dev, "couldn't determine fifo-depth\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,fifo-width", &cqspi->fifo_width)) {
+ dev_err(&pdev->dev, "couldn't determine fifo-width\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "cdns,trigger-address",
+ &cqspi->trigger_address)) {
+ dev_err(&pdev->dev, "couldn't determine trigger-address\n");
+ return -ENXIO;
+ }
+
+ cqspi->rclk_en = of_property_read_bool(np, "cdns,rclk-en");
+
+ return 0;
+}
+
+static void cqspi_controller_init(struct cqspi_st *cqspi)
+{
+ u32 reg;
+
+ cqspi_controller_enable(cqspi, 0);
+
+ /* Configure the remap address register, no remap */
+ writel(0, cqspi->iobase + CQSPI_REG_REMAP);
+
+ /* Disable all interrupts. */
+ writel(0, cqspi->iobase + CQSPI_REG_IRQMASK);
+
+ /* Configure the SRAM split to 1:1 . */
+ writel(cqspi->fifo_depth / 2, cqspi->iobase + CQSPI_REG_SRAMPARTITION);
+
+ /* Load indirect trigger address. */
+ writel(cqspi->trigger_address,
+ cqspi->iobase + CQSPI_REG_INDIRECTTRIGGER);
+
+ /* Program read watermark -- 1/2 of the FIFO. */
+ writel(cqspi->fifo_depth * cqspi->fifo_width / 2,
+ cqspi->iobase + CQSPI_REG_INDIRECTRDWATERMARK);
+ /* Program write watermark -- 1/8 of the FIFO. */
+ writel(cqspi->fifo_depth * cqspi->fifo_width / 8,
+ cqspi->iobase + CQSPI_REG_INDIRECTWRWATERMARK);
+
+ /* Enable Direct Access Controller */
+ reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
+ reg |= CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;
+ writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
+
+ cqspi_controller_enable(cqspi, 1);
+}
+
+static void cqspi_request_mmap_dma(struct cqspi_st *cqspi)
+{
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_MEMCPY, mask);
+
+ cqspi->rx_chan = dma_request_chan_by_mask(&mask);
+ if (IS_ERR(cqspi->rx_chan)) {
+ dev_err(&cqspi->pdev->dev, "No Rx DMA available\n");
+ cqspi->rx_chan = NULL;
+ }
+ init_completion(&cqspi->rx_dma_complete);
+}
+
+static const struct spi_nor_controller_ops cqspi_controller_ops = {
+ .prepare = cqspi_prep,
+ .unprepare = cqspi_unprep,
+ .read_reg = cqspi_read_reg,
+ .write_reg = cqspi_write_reg,
+ .read = cqspi_read,
+ .write = cqspi_write,
+ .erase = cqspi_erase,
+};
+
+static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
+{
+ struct platform_device *pdev = cqspi->pdev;
+ struct device *dev = &pdev->dev;
+ const struct cqspi_driver_platdata *ddata;
+ struct spi_nor_hwcaps hwcaps;
+ struct cqspi_flash_pdata *f_pdata;
+ struct spi_nor *nor;
+ struct mtd_info *mtd;
+ unsigned int cs;
+ int i, ret;
+
+ ddata = of_device_get_match_data(dev);
+ if (!ddata) {
+ dev_err(dev, "Couldn't find driver data\n");
+ return -EINVAL;
+ }
+ hwcaps.mask = ddata->hwcaps_mask;
+
+ /* Get flash device data */
+ for_each_available_child_of_node(dev->of_node, np) {
+ ret = of_property_read_u32(np, "reg", &cs);
+ if (ret) {
+ dev_err(dev, "Couldn't determine chip select.\n");
+ goto err;
+ }
+
+ if (cs >= CQSPI_MAX_CHIPSELECT) {
+ ret = -EINVAL;
+ dev_err(dev, "Chip select %d out of range.\n", cs);
+ goto err;
+ }
+
+ f_pdata = &cqspi->f_pdata[cs];
+ f_pdata->cqspi = cqspi;
+ f_pdata->cs = cs;
+
+ ret = cqspi_of_get_flash_pdata(pdev, f_pdata, np);
+ if (ret)
+ goto err;
+
+ nor = &f_pdata->nor;
+ mtd = &nor->mtd;
+
+ mtd->priv = nor;
+
+ nor->dev = dev;
+ spi_nor_set_flash_node(nor, np);
+ nor->priv = f_pdata;
+ nor->controller_ops = &cqspi_controller_ops;
+
+ mtd->name = devm_kasprintf(dev, GFP_KERNEL, "%s.%d",
+ dev_name(dev), cs);
+ if (!mtd->name) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ ret = spi_nor_scan(nor, NULL, &hwcaps);
+ if (ret)
+ goto err;
+
+ ret = mtd_device_register(mtd, NULL, 0);
+ if (ret)
+ goto err;
+
+ f_pdata->registered = true;
+
+ if (mtd->size <= cqspi->ahb_size) {
+ f_pdata->use_direct_mode = true;
+ dev_dbg(nor->dev, "using direct mode for %s\n",
+ mtd->name);
+
+ if (!cqspi->rx_chan)
+ cqspi_request_mmap_dma(cqspi);
+ }
+ }
+
+ return 0;
+
+err:
+ for (i = 0; i < CQSPI_MAX_CHIPSELECT; i++)
+ if (cqspi->f_pdata[i].registered)
+ mtd_device_unregister(&cqspi->f_pdata[i].nor.mtd);
+ return ret;
+}
+
+static int cqspi_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct cqspi_st *cqspi;
+ struct resource *res;
+ struct resource *res_ahb;
+ struct reset_control *rstc, *rstc_ocp;
+ const struct cqspi_driver_platdata *ddata;
+ int ret;
+ int irq;
+
+ cqspi = devm_kzalloc(dev, sizeof(*cqspi), GFP_KERNEL);
+ if (!cqspi)
+ return -ENOMEM;
+
+ mutex_init(&cqspi->bus_mutex);
+ cqspi->pdev = pdev;
+ platform_set_drvdata(pdev, cqspi);
+
+ /* Obtain configuration from OF. */
+ ret = cqspi_of_get_pdata(pdev);
+ if (ret) {
+ dev_err(dev, "Cannot get mandatory OF data.\n");
+ return -ENODEV;
+ }
+
+ /* Obtain QSPI clock. */
+ cqspi->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(cqspi->clk)) {
+ dev_err(dev, "Cannot claim QSPI clock.\n");
+ return PTR_ERR(cqspi->clk);
+ }
+
+ /* Obtain and remap controller address. */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ cqspi->iobase = devm_ioremap_resource(dev, res);
+ if (IS_ERR(cqspi->iobase)) {
+ dev_err(dev, "Cannot remap controller address.\n");
+ return PTR_ERR(cqspi->iobase);
+ }
+
+ /* Obtain and remap AHB address. */
+ res_ahb = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ cqspi->ahb_base = devm_ioremap_resource(dev, res_ahb);
+ if (IS_ERR(cqspi->ahb_base)) {
+ dev_err(dev, "Cannot remap AHB address.\n");
+ return PTR_ERR(cqspi->ahb_base);
+ }
+ cqspi->mmap_phys_base = (dma_addr_t)res_ahb->start;
+ cqspi->ahb_size = resource_size(res_ahb);
+
+ init_completion(&cqspi->transfer_complete);
+
+ /* Obtain IRQ line. */
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return -ENXIO;
+
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(dev);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(cqspi->clk);
+ if (ret) {
+ dev_err(dev, "Cannot enable QSPI clock.\n");
+ goto probe_clk_failed;
+ }
+
+ /* Obtain QSPI reset control */
+ rstc = devm_reset_control_get_optional_exclusive(dev, "qspi");
+ if (IS_ERR(rstc)) {
+ dev_err(dev, "Cannot get QSPI reset.\n");
+ return PTR_ERR(rstc);
+ }
+
+ rstc_ocp = devm_reset_control_get_optional_exclusive(dev, "qspi-ocp");
+ if (IS_ERR(rstc_ocp)) {
+ dev_err(dev, "Cannot get QSPI OCP reset.\n");
+ return PTR_ERR(rstc_ocp);
+ }
+
+ reset_control_assert(rstc);
+ reset_control_deassert(rstc);
+
+ reset_control_assert(rstc_ocp);
+ reset_control_deassert(rstc_ocp);
+
+ cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk);
+ ddata = of_device_get_match_data(dev);
+ if (ddata && (ddata->quirks & CQSPI_NEEDS_WR_DELAY))
+ cqspi->wr_delay = 5 * DIV_ROUND_UP(NSEC_PER_SEC,
+ cqspi->master_ref_clk_hz);
+
+ ret = devm_request_irq(dev, irq, cqspi_irq_handler, 0,
+ pdev->name, cqspi);
+ if (ret) {
+ dev_err(dev, "Cannot request IRQ.\n");
+ goto probe_irq_failed;
+ }
+
+ cqspi_wait_idle(cqspi);
+ cqspi_controller_init(cqspi);
+ cqspi->current_cs = -1;
+ cqspi->sclk = 0;
+
+ ret = cqspi_setup_flash(cqspi, np);
+ if (ret) {
+ dev_err(dev, "Cadence QSPI NOR probe failed %d\n", ret);
+ goto probe_setup_failed;
+ }
+
+ return ret;
+probe_setup_failed:
+ cqspi_controller_enable(cqspi, 0);
+probe_irq_failed:
+ clk_disable_unprepare(cqspi->clk);
+probe_clk_failed:
+ pm_runtime_put_sync(dev);
+ pm_runtime_disable(dev);
+ return ret;
+}
+
+static int cqspi_remove(struct platform_device *pdev)
+{
+ struct cqspi_st *cqspi = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < CQSPI_MAX_CHIPSELECT; i++)
+ if (cqspi->f_pdata[i].registered)
+ mtd_device_unregister(&cqspi->f_pdata[i].nor.mtd);
+
+ cqspi_controller_enable(cqspi, 0);
+
+ if (cqspi->rx_chan)
+ dma_release_channel(cqspi->rx_chan);
+
+ clk_disable_unprepare(cqspi->clk);
+
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cqspi_suspend(struct device *dev)
+{
+ struct cqspi_st *cqspi = dev_get_drvdata(dev);
+
+ cqspi_controller_enable(cqspi, 0);
+ return 0;
+}
+
+static int cqspi_resume(struct device *dev)
+{
+ struct cqspi_st *cqspi = dev_get_drvdata(dev);
+
+ cqspi_controller_enable(cqspi, 1);
+ return 0;
+}
+
+static const struct dev_pm_ops cqspi__dev_pm_ops = {
+ .suspend = cqspi_suspend,
+ .resume = cqspi_resume,
+};
+
+#define CQSPI_DEV_PM_OPS (&cqspi__dev_pm_ops)
+#else
+#define CQSPI_DEV_PM_OPS NULL
+#endif
+
+static const struct cqspi_driver_platdata cdns_qspi = {
+ .hwcaps_mask = CQSPI_BASE_HWCAPS_MASK,
+};
+
+static const struct cqspi_driver_platdata k2g_qspi = {
+ .hwcaps_mask = CQSPI_BASE_HWCAPS_MASK,
+ .quirks = CQSPI_NEEDS_WR_DELAY,
+};
+
+static const struct cqspi_driver_platdata am654_ospi = {
+ .hwcaps_mask = CQSPI_BASE_HWCAPS_MASK | SNOR_HWCAPS_READ_1_1_8,
+ .quirks = CQSPI_NEEDS_WR_DELAY,
+};
+
+static const struct of_device_id cqspi_dt_ids[] = {
+ {
+ .compatible = "cdns,qspi-nor",
+ .data = &cdns_qspi,
+ },
+ {
+ .compatible = "ti,k2g-qspi",
+ .data = &k2g_qspi,
+ },
+ {
+ .compatible = "ti,am654-ospi",
+ .data = &am654_ospi,
+ },
+ { /* end of table */ }
+};
+
+MODULE_DEVICE_TABLE(of, cqspi_dt_ids);
+
+static struct platform_driver cqspi_platform_driver = {
+ .probe = cqspi_probe,
+ .remove = cqspi_remove,
+ .driver = {
+ .name = CQSPI_NAME,
+ .pm = CQSPI_DEV_PM_OPS,
+ .of_match_table = cqspi_dt_ids,
+ },
+};
+
+module_platform_driver(cqspi_platform_driver);
+
+MODULE_DESCRIPTION("Cadence QSPI Controller Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" CQSPI_NAME);
+MODULE_AUTHOR("Ley Foon Tan <lftan@altera.com>");
+MODULE_AUTHOR("Graham Moore <grmoore@opensource.altera.com>");