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    SubjectRE: [PATCHv1 0/8] unicore32 machine related files: summary
    Date
    [PATCHv1 7/8] unicore32 machine related files: i2c bus
    From: Guan Xuetao <guanxuetao@mprc.pku.edu.cn>

    Patch 7 implements arch-specific i2c bus driver.

    Signed-off-by: Guan Xuetao <guanxuetao@mprc.pku.edu.cn>
    ---
    drivers/staging/puv3/puv3_i2c.c | 325 +++++++++++++++++++++++++++++++++++++++
    1 files changed, 325 insertions(+), 0 deletions(-)

    diff --git a/drivers/staging/puv3/puv3_i2c.c b/drivers/staging/puv3/puv3_i2c.c
    new file mode 100644
    index 0000000..2a118e2
    --- /dev/null
    +++ b/drivers/staging/puv3/puv3_i2c.c
    @@ -0,0 +1,325 @@
    +/*
    + * linux/drivers/staging/puv3/puv3_i2c.c
    + *
    + * 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.
    + *
    + * Based on: drivers/i2c/busses/i2c-at91.c
    + *
    + * Contributors & Additions/Fixes:
    + * 2009-11-05: change loop time for NOT-eeprom
    + * by GUAN Xue-tao & WU Dong-xia
    + * 2009-07-17: add suspend/resume support by WU Dong-xia
    + * 2009-05-30: add support at24c02 by ZHONG Qi
    + * 2009-05-14: add support bq27200 by ZHONG Qi & WU Dong-xia
    + * 2009-05-06: First version by WU Dong-xia
    + *
    + * TODO:
    + * 1. the latnecy from udelay or msleep may be a bit long
    + * change the parameters according to the device
    + */
    +
    +#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 <asm/mach/hardware.h>
    +
    +#define DEBUG
    +
    +static int i2c_reg = -1;
    +
    +static void __devinit puv3_i2c_hwinit(void)
    +{
    + /* Do Noting */
    +}
    +
    +/*
    + * 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 (!(I2C_STATUS & bit) && (--loop_cntr > 0));
    + } else {
    + /* RXRDY handler */
    + do {
    + if (I2C_TAR == I2C_TAR_EEPROM)
    + msleep(20);
    + else
    + udelay(10);
    + } while (!(I2C_RXFLR & 0xf) && (--loop_cntr > 0));
    + }
    +
    + return (loop_cntr > 0);
    +}
    +
    +static int xfer_read(struct i2c_adapter *adap, unsigned char *buf, int length)
    +{
    + /* Read data */
    + while (length--) {
    + if (!poll_status(I2C_STATUS_TFNF)) {
    + dev_dbg(&adap->dev, "Tx FIFO Not Full timeout\n");
    + return -ETIMEDOUT;
    + }
    +
    + /* send addr */
    + I2C_DATACMD = i2c_reg | I2C_DATACMD_WRITE;
    +
    + /* get ready to next write */
    + i2c_reg++;
    +
    + /* send read CMD */
    + I2C_DATACMD = I2C_DATACMD_READ;
    +
    + /* 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 = (I2C_DATACMD & I2C_DATACMD_DAT_MASK);
    + buf++;
    + }
    +
    + i2c_reg = -1;
    +
    + return 0;
    +}
    +
    +static int xfer_write(struct i2c_adapter *adap, unsigned char *buf, int length)
    +{
    + /* Do nothing but storing the reg_num to a static variable */
    + i2c_reg = *buf;
    + if (i2c_reg == -1) {
    + printk(KERN_WARNING "Error i2c reg\n");
    + return -ETIMEDOUT;
    + }
    +
    + if (length == 1)
    + return 0;
    +
    + buf++;
    + length--;
    + while (length--) {
    + /* send addr */
    + I2C_DATACMD = i2c_reg | I2C_DATACMD_WRITE;
    +
    + /* send write CMD */
    + I2C_DATACMD = *buf | I2C_DATACMD_WRITE;
    +
    + /* wait until the Rx FIFO have available */
    + msleep(20);
    +
    + /* read the data to buf */
    + i2c_reg++;
    + buf++;
    + }
    +
    + i2c_reg = -1;
    +
    + 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 */
    + I2C_ENABLE = I2C_ENABLE_DISABLE;
    +
    + /* Set the work mode and speed*/
    + I2C_CON = I2C_CON_MASTER | I2C_CON_SPEED_STD | I2C_CON_SLAVEDISABLE;
    +
    + I2C_TAR = pmsg->addr;
    +
    + /* Enable i2c */
    + I2C_ENABLE = I2C_ENABLE_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 *res;
    + int rc;
    +
    + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    + if (!res)
    + return -ENXIO;
    +
    + if (!request_mem_region(res->start, resource_size(res), "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 fail2;
    + }
    + snprintf(adapter->name, sizeof(adapter->name), "PUV3");
    + adapter->algo = &puv3_i2c_algorithm;
    + adapter->class = I2C_CLASS_HWMON;
    + adapter->dev.parent = &pdev->dev;
    +
    + platform_set_drvdata(pdev, adapter);
    +
    + puv3_i2c_hwinit(); /* initialize TWI controller */
    +
    + rc = i2c_add_numbered_adapter(adapter);
    + if (rc) {
    + dev_err(&pdev->dev, "Adapter %s registration failed\n",
    + adapter->name);
    + goto fail3;
    + }
    +
    + dev_info(&pdev->dev, "PKUnity v3 i2c bus driver.\n");
    + return 0;
    +
    +fail3:
    + platform_set_drvdata(pdev, NULL);
    + kfree(adapter);
    +fail2:
    + release_mem_region(res->start, resource_size(res));
    +
    + return rc;
    +}
    +
    +static int puv3_i2c_remove(struct platform_device *pdev)
    +{
    + struct i2c_adapter *adapter = platform_get_drvdata(pdev);
    + struct resource *res;
    + int rc;
    +
    + rc = i2c_del_adapter(adapter);
    + platform_set_drvdata(pdev, NULL);
    +
    + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    + release_mem_region(res->start, resource_size(res));
    +
    + return rc;
    +}
    +
    +#ifdef CONFIG_PM
    +static int puv3_i2c_suspend(struct platform_device *dev, pm_message_t state)
    +{
    + int poll_count;
    + /* Disable the IIC */
    + I2C_ENABLE = I2C_ENABLE_DISABLE;
    + for (poll_count = 0; poll_count < 50; poll_count++) {
    + if (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_AUTHOR("WU Dong-xia");
    +MODULE_DESCRIPTION("PKUnity v3 I2C driver");
    +MODULE_LICENSE("GPL v2");
    > -----Original Message-----
    > From: linux-arch-owner@vger.kernel.org [mailto:linux-arch-owner@vger.kernel.org] On Behalf Of Guan Xuetao
    > Sent: Thursday, January 06, 2011 3:57 PM
    > To: linux-arch@vger.kernel.org; linux-kernel@vger.kernel.org
    > Subject: [PATCHv1 0/8] unicore32 machine related files: summary
    >
    > From: Guan Xuetao <guanxuetao@mprc.pku.edu.cn>
    >
    > The whole patch could be fetched from:
    > git://git.kernel.org/pub/scm/linux/kernel/git/epip/unicore32.git
    > with branch name: unicore32.
    > And it is divided into three patch sets: core architecture files,
    > additional architecture files, and machine related files.
    >
    > This patch set adds the machine related files for UniCore32 ISA and PKUnity SoC.
    >
    > Patch 1 adds machine related core files, also including build infrastructure.
    >
    > Patch 2 add all hardware registers definitions, which are not split and inserted into
    > different drivers.
    >
    > Patch 3 implements arch-specific pci bus driver.
    >
    > Patch 4 implements arch-specific ps2 dirver.
    >
    > Patch 5 implements frame buffer driver.
    >
    > Patch 6 implements ac97 driver.
    >
    > Patch 7 implements arch-specific i2c bus driver.
    >
    > Patch 8 implements network driver.
    >
    > Signed-off-by: Guan Xuetao <guanxuetao@mprc.pku.edu.cn>
    > ---
    > arch/unicore32/include/asm/mach/PKUnity.h | 104 ++
    > arch/unicore32/include/asm/mach/bitfield.h | 24 +
    > arch/unicore32/include/asm/mach/hardware.h | 45 +
    > arch/unicore32/include/asm/mach/regs-ac97.h | 32 +
    > arch/unicore32/include/asm/mach/regs-dmac.h | 81 +
    > arch/unicore32/include/asm/mach/regs-gpio.h | 70 +
    > arch/unicore32/include/asm/mach/regs-i2c.h | 63 +
    > arch/unicore32/include/asm/mach/regs-intc.h | 28 +
    > arch/unicore32/include/asm/mach/regs-nand.h | 79 +
    > arch/unicore32/include/asm/mach/regs-ost.h | 92 ++
    > arch/unicore32/include/asm/mach/regs-pci.h | 94 ++
    > arch/unicore32/include/asm/mach/regs-pm.h | 126 ++
    > arch/unicore32/include/asm/mach/regs-ps2.h | 20 +
    > arch/unicore32/include/asm/mach/regs-resetc.h | 34 +
    > arch/unicore32/include/asm/mach/regs-rtc.h | 37 +
    > arch/unicore32/include/asm/mach/regs-sdc.h | 156 ++
    > arch/unicore32/include/asm/mach/regs-spi.h | 98 ++
    > arch/unicore32/include/asm/mach/regs-uart.h | 3 +
    > arch/unicore32/include/asm/mach/regs-umal.h | 229 +++
    > arch/unicore32/include/asm/mach/regs-unigfx.h | 200 +++
    > arch/unicore32/include/asm/pci.h | 46 +
    > arch/unicore32/kernel/pci.c | 404 +++++
    > arch/unicore32/kernel/puv3-core.c | 266 ++++
    > arch/unicore32/kernel/puv3-nb0916.c | 183 +++
    > arch/unicore32/kernel/puv3-smw0919.c | 120 ++
    > drivers/input/keyboard/Kconfig | 11 +
    > drivers/input/keyboard/atkbd.c | 4 +
    > drivers/input/mouse/psmouse-base.c | 41 +
    > drivers/input/serio/i8042.h | 2 +
    > drivers/pci/Makefile | 1 +
    > drivers/staging/puv3/Kconfig | 142 ++
    > drivers/staging/puv3/Makefile | 27 +
    > drivers/staging/puv3/TODO | 7 +
    > drivers/staging/puv3/i8042-ucio.h | 96 ++
    > drivers/staging/puv3/nb0916-atkbd.h | 43 +
    > drivers/staging/puv3/puv3_ac97.c | 383 +++++
    > drivers/staging/puv3/puv3_i2c.c | 325 ++++
    > drivers/staging/puv3/puv3_pcm.c | 449 ++++++
    > drivers/staging/puv3/puv3_pcm.h | 33 +
    > drivers/staging/puv3/puv3_umal.c | 2082 +++++++++++++++++++++++++
    > drivers/staging/puv3/puv3_unifb.c | 972 ++++++++++++
    > include/linux/fb.h | 2 +
    > 42 files changed, 7254 insertions(+), 0 deletions(-)
    >
    > --
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