[PATCHv1 7/8] unicore32 machine related files: i2c bus
From: Guan Xuetao <guanxuetao@xxxxxxxxxxxxxxx>
Patch 7 implements arch-specific i2c bus driver.
Signed-off-by: Guan Xuetao <guanxuetao@xxxxxxxxxxxxxxx>
---
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@xxxxxxxxxxxxxxx>
+ * 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@xxxxxxxxxxxxxxx [mailto:linux-arch-owner@xxxxxxxxxxxxxxx] On Behalf Of Guan Xuetao
> Sent: Thursday, January 06, 2011 3:57 PM
> To: linux-arch@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: [PATCHv1 0/8] unicore32 machine related files: summary
>
> From: Guan Xuetao <guanxuetao@xxxxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxxx>
> ---
> 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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