lkml.org 
[lkml]   [2011]   [Jan]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] unicore32: add i2c bus driver for PKUnity SoC
Date
From: Guan Xuetao <gxt@mprc.pku.edu.cn>

This patch adds framebuffer driver for unigfx engine in PKUnity SoC.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
---
drivers/i2c/busses/Kconfig | 5 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/puv3_i2c.c | 300 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 306 insertions(+), 0 deletions(-)

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 3a6321c..20d328c 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -236,6 +236,11 @@ config I2C_VIAPRO
This driver can also be built as a module. If so, the module
will be called i2c-viapro.

+config I2C_PUV3
+ tristate "PKUnity v3 I2C bus support"
+ depends on I2C && UNICORE32 && ARCH_PUV3
+ select I2C_ALGOBIT
+
if ACPI

comment "ACPI drivers"
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 84cb16a..cb4a097 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -61,6 +61,7 @@ obj-$(CONFIG_I2C_STU300) += i2c-stu300.o
obj-$(CONFIG_I2C_VERSATILE) += i2c-versatile.o
obj-$(CONFIG_I2C_OCTEON) += i2c-octeon.o
obj-$(CONFIG_I2C_XILINX) += i2c-xiic.o
+obj-$(CONFIG_I2C_PUV3) += puv3_i2c.o

# External I2C/SMBus adapter drivers
obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
diff --git a/drivers/i2c/busses/puv3_i2c.c b/drivers/i2c/busses/puv3_i2c.c
new file mode 100644
index 0000000..fb4f1fd
--- /dev/null
+++ b/drivers/i2c/busses/puv3_i2c.c
@@ -0,0 +1,300 @@
+/*
+ * 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>
+
+static int i2c_reg = -1;
+
+/*
+ * 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);
+
+ 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_DESCRIPTION("PKUnity v3 I2C driver");
+MODULE_LICENSE("GPL v2");


\
 
 \ /
  Last update: 2011-01-24 03:33    [W:0.047 / U:1.344 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site