arch/arm/common/scoop.c

   1 /*
   2  * Support code for the SCOOP interface found on various Sharp PDAs
   3  *
   4  * Copyright (c) 2004 Richard Purdie
   5  *
   6  *      Based on code written by Sharp/Lineo for 2.4 kernels
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/string.h>
  16 #include <linux/platform_device.h>
  17 #include <asm/io.h>
  18 #include <asm/hardware/scoop.h>
  19
  20 #define SCOOP_REG(d,adr) (*(volatile unsigned short*)(d +(adr)))
  21
  22 struct  scoop_dev {
  23         void  *base;
  24         spinlock_t scoop_lock;
  25         unsigned short suspend_clr;
  26         unsigned short suspend_set;
  27         u32 scoop_gpwr;
  28 };
  29
  30 void reset_scoop(struct device *dev)
  31 {
  32         struct scoop_dev *sdev = dev_get_drvdata(dev);
  33
  34         SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100;  // 00
  35         SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000;  // 04
  36         SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000;  // 10
  37         SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000;  // 18
  38         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF;  // 14
  39         SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000;  // 1C
  40         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
  41 }
  42
  43 unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
  44 {
  45         unsigned short gpio_bit;
  46         unsigned long flag;
  47         struct scoop_dev *sdev = dev_get_drvdata(dev);
  48
  49         spin_lock_irqsave(&sdev->scoop_lock, flag);
  50         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
  51         SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
  52         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
  53
  54         return gpio_bit;
  55 }
  56
  57 unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
  58 {
  59         unsigned short gpio_bit;
  60         unsigned long flag;
  61         struct scoop_dev *sdev = dev_get_drvdata(dev);
  62
  63         spin_lock_irqsave(&sdev->scoop_lock, flag);
  64         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
  65         SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
  66         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
  67
  68         return gpio_bit;
  69 }
  70
  71 EXPORT_SYMBOL(set_scoop_gpio);
  72 EXPORT_SYMBOL(reset_scoop_gpio);
  73
  74 unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
  75 {
  76         struct scoop_dev *sdev = dev_get_drvdata(dev);
  77         return SCOOP_REG(sdev->base,reg);
  78 }
  79
  80 void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
  81 {
  82         struct scoop_dev *sdev = dev_get_drvdata(dev);
  83         SCOOP_REG(sdev->base,reg)=data;
  84 }
  85
  86 EXPORT_SYMBOL(reset_scoop);
  87 EXPORT_SYMBOL(read_scoop_reg);
  88 EXPORT_SYMBOL(write_scoop_reg);
  89
  90 static void check_scoop_reg(struct scoop_dev *sdev)
  91 {
  92         unsigned short mcr;
  93
  94         mcr = SCOOP_REG(sdev->base, SCOOP_MCR);
  95         if ((mcr & 0x100) == 0)
  96                 SCOOP_REG(sdev->base, SCOOP_MCR) = 0x0101;
  97 }
  98
  99 #ifdef CONFIG_PM
 100 static int scoop_suspend(struct platform_device *dev, pm_message_t state)
 101 {
 102         struct scoop_dev *sdev = platform_get_drvdata(dev);
 103
 104         check_scoop_reg(sdev);
 105         sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR);
 106         SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set;
 107
 108         return 0;
 109 }
 110
 111 static int scoop_resume(struct platform_device *dev)
 112 {
 113         struct scoop_dev *sdev = platform_get_drvdata(dev);
 114
 115         check_scoop_reg(sdev);
 116         SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
 117
 118         return 0;
 119 }
 120 #else
 121 #define scoop_suspend   NULL
 122 #define scoop_resume    NULL
 123 #endif
 124
 125 int __init scoop_probe(struct platform_device *pdev)
 126 {
 127         struct scoop_dev *devptr;
 128         struct scoop_config *inf;
 129         struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 130
 131         if (!mem)
 132                 return -EINVAL;
 133
 134         devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
 135
 136         if (!devptr)
 137                 return  -ENOMEM;
 138
 139         memset(devptr, 0, sizeof(struct scoop_dev));
 140         spin_lock_init(&devptr->scoop_lock);
 141
 142         inf = pdev->dev.platform_data;
 143         devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
 144
 145         if (!devptr->base) {
 146                 kfree(devptr);
 147                 return -ENOMEM;
 148         }
 149
 150         platform_set_drvdata(pdev, devptr);
 151
 152         printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
 153
 154         SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
 155         reset_scoop(&pdev->dev);
 156         SCOOP_REG(devptr->base, SCOOP_CPR) = 0x0000;
 157         SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
 158         SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
 159
 160         devptr->suspend_clr = inf->suspend_clr;
 161         devptr->suspend_set = inf->suspend_set;
 162
 163         return 0;
 164 }
 165
 166 static int scoop_remove(struct platform_device *pdev)
 167 {
 168         struct scoop_dev *sdev = platform_get_drvdata(pdev);
 169         if (sdev) {
 170                 iounmap(sdev->base);
 171                 kfree(sdev);
 172                 platform_set_drvdata(pdev, NULL);
 173         }
 174         return 0;
 175 }
 176
 177 static struct platform_driver scoop_driver = {
 178         .probe          = scoop_probe,
 179         .remove         = scoop_remove,
 180         .suspend        = scoop_suspend,
 181         .resume         = scoop_resume,
 182         .driver         = {
 183                 .name   = "sharp-scoop",
 184         },
 185 };
 186
 187 int __init scoop_init(void)
 188 {
 189         return platform_driver_register(&scoop_driver);
 190 }
 191
 192 subsys_initcall(scoop_init);