From: Guan Xuetao <[email protected]> This patch adds framebuffer driver for unigfx engine in PKUnity SoC.
Signed-off-by: Guan Xuetao <[email protected]> --- 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 <[email protected]> + * 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"); -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
