summaryrefslogtreecommitdiff
path: root/drivers/i2c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2020-08-03 14:00:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-03 14:00:16 -0700
commit05119217a9bd199c4b8b12c01f86df09108b109b (patch)
treef74f4227e3a7610821c1243b4424f5769c88697b /drivers/i2c
parent45365a06aa305c9eca1cbf48aef48a7a0cea3b4e (diff)
parent3346dd99fb4cd174fdbfb68dc62cd109e4323f0f (diff)
Merge tag 'rm-unicore32' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux
Pull unicore32 removal from Mike Rapoport: "Remove unicore32 support. The unicore32 port do not seem maintained for a long time now, there is no upstream toolchain that can create unicore32 binaries and all the links to prebuilt toolchains for unicore32 are dead. Even compilers that were available are not supported by the kernel anymore. Guenter Roeck says: "I have stopped building unicore32 images since v4.19 since there is no available compiler that is still supported by the kernel. I am surprised that support for it has not been removed from the kernel" However, it's worth pointing out two things: - Guan Xuetao is still listed as maintainer and asked for the port to be kept around the last time Arnd suggested removing it two years ago. He promised that there would be compiler sources (presumably llvm), but has not made those available since. - https://github.com/gxt has patches to linux-4.9 and qemu-2.7, both released in 2016, with patches dated early 2019. These patches mainly restore a syscall ABI that was never part of mainline Linux but apparently used in production. qemu-2.8 removed support for that ABI and newer kernels (4.19+) can no longer be built with the old toolchain, so apparently there will not be any future updates to that git tree" * tag 'rm-unicore32' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux: MAINTAINERS: remove "PKUNITY SOC DRIVERS" entry rtc: remove fb-puv3 driver video: fbdev: remove fb-puv3 driver pwm: remove pwm-puv3 driver input: i8042: remove support for 8042-unicore32io i2c/buses: remove i2c-puv3 driver cpufreq: remove unicore32 driver arch: remove unicore32 port
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/Kconfig11
-rw-r--r--drivers/i2c/busses/Makefile1
-rw-r--r--drivers/i2c/busses/i2c-puv3.c275
3 files changed, 0 insertions, 287 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 735bf31a3fdf..88639e52c73a 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -866,17 +866,6 @@ config I2C_PNX
This driver can also be built as a module. If so, the module
will be called i2c-pnx.
-config I2C_PUV3
- tristate "PKUnity v3 I2C bus support"
- depends on UNICORE32 && ARCH_PUV3
- select I2C_ALGOBIT
- help
- This driver supports the I2C IP inside the PKUnity-v3 SoC.
- This I2C bus controller is under AMBA/AXI bus.
-
- This driver can also be built as a module. If so, the module
- will be called i2c-puv3.
-
config I2C_PXA
tristate "Intel PXA2XX I2C adapter"
depends on ARCH_PXA || ARCH_MMP || ARCH_MVEBU || (X86_32 && PCI && OF) || COMPILE_TEST
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 306d5dc3f417..19aff0e45cb5 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -88,7 +88,6 @@ obj-$(CONFIG_I2C_PASEMI) += i2c-pasemi.o
obj-$(CONFIG_I2C_PCA_PLATFORM) += i2c-pca-platform.o
obj-$(CONFIG_I2C_PMCMSP) += i2c-pmcmsp.o
obj-$(CONFIG_I2C_PNX) += i2c-pnx.o
-obj-$(CONFIG_I2C_PUV3) += i2c-puv3.o
obj-$(CONFIG_I2C_PXA) += i2c-pxa.o
obj-$(CONFIG_I2C_PXA_PCI) += i2c-pxa-pci.o
obj-$(CONFIG_I2C_QCOM_CCI) += i2c-qcom-cci.o
diff --git a/drivers/i2c/busses/i2c-puv3.c b/drivers/i2c/busses/i2c-puv3.c
deleted file mode 100644
index 5cec5a36807d..000000000000
--- a/drivers/i2c/busses/i2c-puv3.c
+++ /dev/null
@@ -1,275 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * I2C driver for PKUnity-v3 SoC
- * Code specific to PKUnity SoC and UniCore ISA
- *
- * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
- * Copyright (C) 2001-2010 Guan Xuetao
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/err.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <linux/delay.h>
-#include <linux/i2c.h>
-#include <linux/clk.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <mach/hardware.h>
-
-/*
- * Poll the i2c status register until the specified bit is set.
- * Returns 0 if timed out (100 msec).
- */
-static short poll_status(unsigned long bit)
-{
- int loop_cntr = 1000;
-
- if (bit & I2C_STATUS_TFNF) {
- do {
- udelay(10);
- } while (!(readl(I2C_STATUS) & bit) && (--loop_cntr > 0));
- } else {
- /* RXRDY handler */
- do {
- if (readl(I2C_TAR) == I2C_TAR_EEPROM)
- msleep(20);
- else
- udelay(10);
- } while (!(readl(I2C_RXFLR) & 0xf) && (--loop_cntr > 0));
- }
-
- return (loop_cntr > 0);
-}
-
-static int xfer_read(struct i2c_adapter *adap, unsigned char *buf, int length)
-{
- int i2c_reg = *buf;
-
- /* Read data */
- while (length--) {
- if (!poll_status(I2C_STATUS_TFNF)) {
- dev_dbg(&adap->dev, "Tx FIFO Not Full timeout\n");
- return -ETIMEDOUT;
- }
-
- /* send addr */
- writel(i2c_reg | I2C_DATACMD_WRITE, I2C_DATACMD);
-
- /* get ready to next write */
- i2c_reg++;
-
- /* send read CMD */
- writel(I2C_DATACMD_READ, I2C_DATACMD);
-
- /* wait until the Rx FIFO have available */
- if (!poll_status(I2C_STATUS_RFNE)) {
- dev_dbg(&adap->dev, "RXRDY timeout\n");
- return -ETIMEDOUT;
- }
-
- /* read the data to buf */
- *buf = (readl(I2C_DATACMD) & I2C_DATACMD_DAT_MASK);
- buf++;
- }
-
- return 0;
-}
-
-static int xfer_write(struct i2c_adapter *adap, unsigned char *buf, int length)
-{
- int i2c_reg = *buf;
-
- /* Do nothing but storing the reg_num to a static variable */
- if (i2c_reg == -1) {
- printk(KERN_WARNING "Error i2c reg\n");
- return -ETIMEDOUT;
- }
-
- if (length == 1)
- return 0;
-
- buf++;
- length--;
- while (length--) {
- /* send addr */
- writel(i2c_reg | I2C_DATACMD_WRITE, I2C_DATACMD);
-
- /* send write CMD */
- writel(*buf | I2C_DATACMD_WRITE, I2C_DATACMD);
-
- /* wait until the Rx FIFO have available */
- msleep(20);
-
- /* read the data to buf */
- i2c_reg++;
- buf++;
- }
-
- return 0;
-}
-
-/*
- * Generic i2c master transfer entrypoint.
- *
- */
-static int puv3_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *pmsg,
- int num)
-{
- int i, ret;
- unsigned char swap;
-
- /* Disable i2c */
- writel(I2C_ENABLE_DISABLE, I2C_ENABLE);
-
- /* Set the work mode and speed*/
- writel(I2C_CON_MASTER | I2C_CON_SPEED_STD | I2C_CON_SLAVEDISABLE, I2C_CON);
-
- writel(pmsg->addr, I2C_TAR);
-
- /* Enable i2c */
- writel(I2C_ENABLE_ENABLE, I2C_ENABLE);
-
- dev_dbg(&adap->dev, "puv3_i2c_xfer: processing %d messages:\n", num);
-
- for (i = 0; i < num; i++) {
- dev_dbg(&adap->dev, " #%d: %sing %d byte%s %s 0x%02x\n", i,
- pmsg->flags & I2C_M_RD ? "read" : "writ",
- pmsg->len, pmsg->len > 1 ? "s" : "",
- pmsg->flags & I2C_M_RD ? "from" : "to", pmsg->addr);
-
- if (pmsg->len && pmsg->buf) { /* sanity check */
- if (pmsg->flags & I2C_M_RD)
- ret = xfer_read(adap, pmsg->buf, pmsg->len);
- else
- ret = xfer_write(adap, pmsg->buf, pmsg->len);
-
- if (ret)
- return ret;
-
- }
- dev_dbg(&adap->dev, "transfer complete\n");
- pmsg++; /* next message */
- }
-
- /* XXX: fixup be16_to_cpu in bq27x00_battery.c */
- if (pmsg->addr == I2C_TAR_PWIC) {
- swap = pmsg->buf[0];
- pmsg->buf[0] = pmsg->buf[1];
- pmsg->buf[1] = swap;
- }
-
- return i;
-}
-
-/*
- * Return list of supported functionality.
- */
-static u32 puv3_i2c_func(struct i2c_adapter *adapter)
-{
- return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
-}
-
-static const struct i2c_algorithm puv3_i2c_algorithm = {
- .master_xfer = puv3_i2c_xfer,
- .functionality = puv3_i2c_func,
-};
-
-/*
- * Main initialization routine.
- */
-static int puv3_i2c_probe(struct platform_device *pdev)
-{
- struct i2c_adapter *adapter;
- struct resource *mem;
- int rc;
-
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!mem)
- return -ENODEV;
-
- if (!request_mem_region(mem->start, resource_size(mem), "puv3_i2c"))
- return -EBUSY;
-
- adapter = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
- if (adapter == NULL) {
- dev_err(&pdev->dev, "can't allocate interface!\n");
- rc = -ENOMEM;
- goto fail_nomem;
- }
- snprintf(adapter->name, sizeof(adapter->name), "PUV3-I2C at 0x%08x",
- mem->start);
- adapter->algo = &puv3_i2c_algorithm;
- adapter->class = I2C_CLASS_HWMON;
- adapter->dev.parent = &pdev->dev;
-
- platform_set_drvdata(pdev, adapter);
-
- adapter->nr = pdev->id;
- rc = i2c_add_numbered_adapter(adapter);
- if (rc)
- goto fail_add_adapter;
-
- dev_info(&pdev->dev, "PKUnity v3 i2c bus adapter.\n");
- return 0;
-
-fail_add_adapter:
- kfree(adapter);
-fail_nomem:
- release_mem_region(mem->start, resource_size(mem));
-
- return rc;
-}
-
-static int puv3_i2c_remove(struct platform_device *pdev)
-{
- struct i2c_adapter *adapter = platform_get_drvdata(pdev);
- struct resource *mem;
-
- i2c_del_adapter(adapter);
-
- put_device(&pdev->dev);
-
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- release_mem_region(mem->start, resource_size(mem));
-
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int puv3_i2c_suspend(struct device *dev)
-{
- int poll_count;
- /* Disable the IIC */
- writel(I2C_ENABLE_DISABLE, I2C_ENABLE);
- for (poll_count = 0; poll_count < 50; poll_count++) {
- if (readl(I2C_ENSTATUS) & I2C_ENSTATUS_ENABLE)
- udelay(25);
- }
-
- return 0;
-}
-
-static SIMPLE_DEV_PM_OPS(puv3_i2c_pm, puv3_i2c_suspend, NULL);
-#define PUV3_I2C_PM (&puv3_i2c_pm)
-
-#else
-#define PUV3_I2C_PM NULL
-#endif
-
-static struct platform_driver puv3_i2c_driver = {
- .probe = puv3_i2c_probe,
- .remove = puv3_i2c_remove,
- .driver = {
- .name = "PKUnity-v3-I2C",
- .pm = PUV3_I2C_PM,
- }
-};
-
-module_platform_driver(puv3_i2c_driver);
-
-MODULE_DESCRIPTION("PKUnity v3 I2C driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:puv3_i2c");