arch/arm/plat-samsung/dev-i2c0.c

   1 /* linux/arch/arm/plat-s3c/dev-i2c0.c
   2  *
   3  * Copyright 2008-2009 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *      http://armlinux.simtec.co.uk/
   6  *
   7  * S3C series device definition for i2c device 0
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12 */
  13
  14 #include <linux/gfp.h>
  15 #include <linux/kernel.h>
  16 #include <linux/string.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/clk.h>
  19 #include <linux/err.h>
  20
  21 #include <mach/irqs.h>
  22 #include <mach/map.h>
  23
  24 #include <plat/regs-iic.h>
  25 #include <plat/iic.h>
  26 #include <plat/devs.h>
  27 #include <plat/cpu.h>
  28
  29 #include <asm/io.h>
  30
  31 static struct resource s3c_i2c_resource[] = {
  32         [0] = {
  33                 .start = S3C_PA_IIC,
  34                 .end   = S3C_PA_IIC + SZ_4K - 1,
  35                 .flags = IORESOURCE_MEM,
  36         },
  37         [1] = {
  38                 .start = IRQ_IIC,
  39                 .end   = IRQ_IIC,
  40                 .flags = IORESOURCE_IRQ,
  41         },
  42 };
  43
  44 struct platform_device s3c_device_i2c0 = {
  45         .name             = "s3c2440-i2c",
  46 #ifdef CONFIG_S3C_DEV_I2C1
  47         .id               = 0,
  48 #else
  49         .id               = -1,
  50 #endif
  51         .num_resources    = ARRAY_SIZE(s3c_i2c_resource),
  52         .resource         = s3c_i2c_resource,
  53 };
  54
  55 static struct s3c2410_platform_i2c default_i2c_data0 __initdata = {
  56         .flags          = 0,
  57         .bus_num        = 0,
  58         .slave_addr     = 0x10,
  59         .frequency      = 400*1000,
  60         .sda_delay      = S3C2410_IICLC_SDA_DELAY5 | S3C2410_IICLC_FILTER_ON,
  61 };
  62
  63 void __init s3c_i2c0_set_platdata(struct s3c2410_platform_i2c *pd)
  64 {
  65         struct s3c2410_platform_i2c *npd;
  66
  67         if (!pd)
  68                 pd = &default_i2c_data0;
  69
  70         npd = kmemdup(pd, sizeof(struct s3c2410_platform_i2c), GFP_KERNEL);
  71         if (!npd)
  72                 printk(KERN_ERR "%s: no memory for platform data\n", __func__);
  73         else if (!npd->cfg_gpio)
  74                 npd->cfg_gpio = s3c_i2c0_cfg_gpio;
  75
  76         s3c_device_i2c0.dev.platform_data = npd;
  77 }
  78 void s3c_i2c0_force_stop()
  79 {
  80         void __iomem *regs;
  81         struct clk *clk;
  82         unsigned long iicstat;
  83
  84         regs = ioremap(S3C_PA_IIC, SZ_4K);
  85         if(regs == NULL) {
  86                 printk(KERN_ERR "%s, cannot request IO\n", __func__);
  87                 return;
  88         }
  89
  90         clk = clk_get(&s3c_device_i2c0.dev, "i2c");
  91         if(clk == NULL || IS_ERR(clk)) {
  92                 printk(KERN_ERR "%s, cannot get cloock\n", __func__);
  93                 return;
  94         }
  95
  96         clk_enable(clk);
  97         iicstat = readl(regs + S3C2410_IICSTAT);
  98         writel(iicstat & ~S3C2410_IICSTAT_TXRXEN, regs + S3C2410_IICSTAT);
  99         clk_disable(clk);
 100
 101         iounmap(regs);
 102 }
 103 EXPORT_SYMBOL(s3c_i2c0_force_stop);
 104