target/linux/s3c24xx/patches/0137-s3c24xx-pwm-platform-driver.patch.patch

   1 From 6563c08a68d30e3b53b6a3a2b1916b129f4afc68 Mon Sep 17 00:00:00 2001
   2 From: matt_hsu <matt_hsu@openmoko.org>
   3 Date: Fri, 25 Jul 2008 23:06:08 +0100
   4 Subject: [PATCH] s3c24xx-pwm-platform-driver.patch
   5
   6 This patch is to register pwm as platform driver to keep the PWM-related
   7 config when system is in suspend/resume. This could fix the following
   8 issue after resume:
   9
  10 - HDQ read timeout
  11 - LEDs blinked abnormally(if LEDs is driven by PWM)
  12
  13 Signed-off-by: Matt Hsu <matt_hsu@openmoko.org>
  14 ---
  15  arch/arm/mach-s3c2410/pwm.c        |   63 ++++++++++++++++++++++++++++++++++++
  16  arch/arm/mach-s3c2440/mach-gta02.c |    6 +++
  17  2 files changed, 69 insertions(+), 0 deletions(-)
  18
  19 diff --git a/arch/arm/mach-s3c2410/pwm.c b/arch/arm/mach-s3c2410/pwm.c
  20 index 23738c1..86a4faa 100644
  21 --- a/arch/arm/mach-s3c2410/pwm.c
  22 +++ b/arch/arm/mach-s3c2410/pwm.c
  23 @@ -20,10 +20,17 @@
  24  #include <linux/kernel.h>
  25  #include <linux/init.h>
  26  #include <linux/clk.h>
  27 +#include <linux/device.h>
  28  #include <asm/hardware.h>
  29  #include <asm/plat-s3c/regs-timer.h>
  30  #include <asm/arch/pwm.h>
  31
  32 +#ifdef CONFIG_PM
  33 +       static unsigned long standby_reg_tcon;
  34 +       static unsigned long standby_reg_tcfg0;
  35 +       static unsigned long standby_reg_tcfg1;
  36 +#endif
  37 +
  38  int s3c2410_pwm_disable(struct s3c2410_pwm *pwm)
  39  {
  40         unsigned long tcon;
  41 @@ -212,3 +219,59 @@ int s3c2410_pwm_dumpregs(void)
  42         return 0;
  43  }
  44  EXPORT_SYMBOL_GPL(s3c2410_pwm_dumpregs);
  45 +
  46 +static int __init s3c24xx_pwm_probe(struct platform_device *pdev)
  47 +{
  48 +       dev_info(&pdev->dev, "s3c24xx_pwm is registered \n");
  49 +
  50 +       return 0;
  51 +}
  52 +
  53 +#ifdef CONFIG_PM
  54 +static int s3c24xx_pwm_suspend(struct platform_device *pdev, pm_message_t state)
  55 +{
  56 +       /* PWM config should be kept in suspending */
  57 +       standby_reg_tcon = __raw_readl(S3C2410_TCON);
  58 +       standby_reg_tcfg0 = __raw_readl(S3C2410_TCFG0);
  59 +       standby_reg_tcfg1 = __raw_readl(S3C2410_TCFG1);
  60 +
  61 +       return 0;
  62 +}
  63 +
  64 +static int s3c24xx_pwm_resume(struct platform_device *pdev)
  65 +{
  66 +       __raw_writel(standby_reg_tcon, S3C2410_TCON);
  67 +       __raw_writel(standby_reg_tcfg0, S3C2410_TCFG0);
  68 +       __raw_writel(standby_reg_tcfg1, S3C2410_TCFG1);
  69 +
  70 +       return 0;
  71 +}
  72 +#else
  73 +#define sc32440_pwm_suspend    NULL
  74 +#define sc32440_pwm_resume     NULL
  75 +#endif
  76 +
  77 +static struct platform_driver s3c24xx_pwm_driver = {
  78 +       .driver = {
  79 +               .name   = "s3c24xx_pwm",
  80 +               .owner  = THIS_MODULE,
  81 +       },
  82 +       .probe   = s3c24xx_pwm_probe,
  83 +       .suspend = s3c24xx_pwm_suspend,
  84 +       .resume  = s3c24xx_pwm_resume,
  85 +};
  86 +
  87 +static int __init s3c24xx_pwm_init(void)
  88 +{
  89 +       return platform_driver_register(&s3c24xx_pwm_driver);
  90 +}
  91 +
  92 +static void __exit s3c24xx_pwm_exit(void)
  93 +{
  94 +}
  95 +
  96 +MODULE_AUTHOR("Javi Roman <javiroman@kernel-labs.org>");
  97 +MODULE_LICENSE("GPL");
  98 +
  99 +module_init(s3c24xx_pwm_init);
 100 +module_exit(s3c24xx_pwm_exit);
 101 diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
 102 index 27babc9..1954121 100644
 103 --- a/arch/arm/mach-s3c2440/mach-gta02.c
 104 +++ b/arch/arm/mach-s3c2440/mach-gta02.c
 105 @@ -719,6 +719,11 @@ static struct platform_device gta02_sdio_dev = {
 106          .num_resources  = ARRAY_SIZE(gta02_sdio_resources),
 107  };
 108
 109 +struct platform_device s3c24xx_pwm_device = {
 110 +       .name           = "s3c24xx_pwm",
 111 +       .num_resources  = 0,
 112 +};
 113 +
 114  static struct platform_device *gta02_devices[] __initdata = {
 115         &s3c_device_usb,
 116         &s3c_device_wdt,
 117 @@ -731,6 +736,7 @@ static struct platform_device *gta02_devices[] __initdata = {
 118         &gta02_nor_flash,
 119         &sc32440_fiq_device,
 120         &gta02_version_device,
 121 +       &s3c24xx_pwm_device,
 122  };
 123
 124  static struct s3c2410_nand_set gta02_nand_sets[] = {
 125 --
 126 1.5.6.3
 127