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    Subject[PATCH 14/17] unicore32 machine related files: add i2c bus drivers for pkunity-v3 soc
    Date
    From: GuanXuetao <gxt@mprc.pku.edu.cn>

    change from original version -- by advice of Jean Delvare
    1. remove global variable i2c_reg, replaced by local variables
    2. replace ENXIO with ENODEV when no platform resources
    3. add adapter->nr assignment before i2c_add_numbered_adapter() call
    4. add judgement for i2c_del_adapter() return value
    5. release adapter when driver removed
    6. add __devexit for puv3_i2c_remove() function
    7. modify several names to more appropriated ones

    Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
    ---
    MAINTAINERS | 1 +
    arch/unicore32/configs/debug_defconfig | 4 +
    drivers/i2c/busses/Kconfig | 11 ++
    drivers/i2c/busses/Makefile | 1 +
    drivers/i2c/busses/i2c-puv3.c | 306 ++++++++++++++++++++++++++++++++
    5 files changed, 323 insertions(+), 0 deletions(-)
    create mode 100644 drivers/i2c/busses/i2c-puv3.c

    diff --git a/MAINTAINERS b/MAINTAINERS
    index a175ec4..1058d59 100644
    --- a/MAINTAINERS
    +++ b/MAINTAINERS
    @@ -4888,6 +4888,7 @@ W: http://mprc.pku.edu.cn/~guanxuetao/linux
    S: Maintained
    T: git git://git.kernel.org/pub/scm/linux/kernel/git/epip/linux-2.6-unicore32.git
    F: drivers/input/serio/i8042-unicore32io.h
    +F: drivers/i2c/busses/i2c-puv3.c

    PMC SIERRA MaxRAID DRIVER
    M: Anil Ravindranath <anil_ravindranath@pmc-sierra.com>
    diff --git a/arch/unicore32/configs/debug_defconfig b/arch/unicore32/configs/debug_defconfig
    index 3647f68..bf42abd 100644
    --- a/arch/unicore32/configs/debug_defconfig
    +++ b/arch/unicore32/configs/debug_defconfig
    @@ -114,6 +114,10 @@ CONFIG_INPUT_EVDEV=m
    # Keyboards
    CONFIG_KEYBOARD_GPIO=m

    +# I2C support
    +CONFIG_I2C=y
    +CONFIG_I2C_PUV3=y
    +
    # Hardware Monitoring support
    #CONFIG_SENSORS_LM75=m
    # Generic Thermal sysfs driver
    diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
    index 113505a..cbfcf6f 100644
    --- a/drivers/i2c/busses/Kconfig
    +++ b/drivers/i2c/busses/Kconfig
    @@ -523,6 +523,17 @@ 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
    diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
    index 9d2d0ec..a83966a 100644
    --- a/drivers/i2c/busses/Makefile
    +++ b/drivers/i2c/busses/Makefile
    @@ -51,6 +51,7 @@ 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-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o
    obj-$(CONFIG_I2C_S6000) += i2c-s6000.o
    diff --git a/drivers/i2c/busses/i2c-puv3.c b/drivers/i2c/busses/i2c-puv3.c
    new file mode 100644
    index 0000000..fac6739
    --- /dev/null
    +++ b/drivers/i2c/busses/i2c-puv3.c
    @@ -0,0 +1,306 @@
    +/*
    + * 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
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License version 2 as
    + * published by the Free Software Foundation.
    + */
    +
    +#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/init.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 struct i2c_algorithm puv3_i2c_algorithm = {
    + .master_xfer = puv3_i2c_xfer,
    + .functionality = puv3_i2c_func,
    +};
    +
    +/*
    + * Main initialization routine.
    + */
    +static int __devinit 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 inteface!\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) {
    + dev_err(&pdev->dev, "Adapter '%s' registration failed\n",
    + adapter->name);
    + goto fail_add_adapter;
    + }
    +
    + dev_info(&pdev->dev, "PKUnity v3 i2c bus adapter.\n");
    + return 0;
    +
    +fail_add_adapter:
    + platform_set_drvdata(pdev, NULL);
    + kfree(adapter);
    +fail_nomem:
    + release_mem_region(mem->start, resource_size(mem));
    +
    + return rc;
    +}
    +
    +static int __devexit puv3_i2c_remove(struct platform_device *pdev)
    +{
    + struct i2c_adapter *adapter = platform_get_drvdata(pdev);
    + struct resource *mem;
    + int rc;
    +
    + rc = i2c_del_adapter(adapter);
    + if (rc) {
    + dev_err(&pdev->dev, "Adapter '%s' delete fail\n",
    + adapter->name);
    + return rc;
    + }
    +
    + put_device(&pdev->dev);
    + platform_set_drvdata(pdev, NULL);
    +
    + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    + release_mem_region(mem->start, resource_size(mem));
    +
    + return rc;
    +}
    +
    +#ifdef CONFIG_PM
    +static int puv3_i2c_suspend(struct platform_device *dev, pm_message_t state)
    +{
    + 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 int puv3_i2c_resume(struct platform_device *dev)
    +{
    + return 0 ;
    +}
    +#else
    +#define puv3_i2c_suspend NULL
    +#define puv3_i2c_resume NULL
    +#endif
    +
    +MODULE_ALIAS("platform:puv3_i2c");
    +
    +static struct platform_driver puv3_i2c_driver = {
    + .probe = puv3_i2c_probe,
    + .remove = __devexit_p(puv3_i2c_remove),
    + .suspend = puv3_i2c_suspend,
    + .resume = puv3_i2c_resume,
    + .driver = {
    + .name = "PKUnity-v3-I2C",
    + .owner = THIS_MODULE,
    + }
    +};
    +
    +static int __init puv3_i2c_init(void)
    +{
    + return platform_driver_register(&puv3_i2c_driver);
    +}
    +
    +static void __exit puv3_i2c_exit(void)
    +{
    + platform_driver_unregister(&puv3_i2c_driver);
    +}
    +
    +module_init(puv3_i2c_init);
    +module_exit(puv3_i2c_exit);
    +
    +MODULE_DESCRIPTION("PKUnity v3 I2C driver");
    +MODULE_LICENSE("GPL v2");
    --
    1.7.4.1


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