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