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 <asm/io.h>
  16 #include <asm/hardware/scoop.h>
  17
  18 #define SCOOP_REG(d,adr) (*(volatile unsigned short*)(d +(adr)))
  19
  20 struct  scoop_dev {
  21         void  *base;
  22         spinlock_t scoop_lock;
  23         u32 scoop_gpwr;
  24 };
  25
  26 void reset_scoop(struct device *dev)
  27 {
  28         struct scoop_dev *sdev = dev_get_drvdata(dev);
  29
  30         SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100;  // 00
  31         SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000;  // 04
  32         SCOOP_REG(sdev->base,SCOOP_CPR) = 0x0000;  // 0C
  33         SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000;  // 10
  34         SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000;  // 18
  35         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF;  // 14
  36         SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000;  // 1C
  37         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
  38 }
  39
  40 unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
  41 {
  42         unsigned short gpio_bit;
  43         unsigned long flag;
  44         struct scoop_dev *sdev = dev_get_drvdata(dev);
  45
  46         spin_lock_irqsave(&sdev->scoop_lock, flag);
  47         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
  48         SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
  49         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
  50
  51         return gpio_bit;
  52 }
  53
  54 unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
  55 {
  56         unsigned short gpio_bit;
  57         unsigned long flag;
  58         struct scoop_dev *sdev = dev_get_drvdata(dev);
  59
  60         spin_lock_irqsave(&sdev->scoop_lock, flag);
  61         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
  62         SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
  63         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
  64
  65         return gpio_bit;
  66 }
  67
  68 EXPORT_SYMBOL(set_scoop_gpio);
  69 EXPORT_SYMBOL(reset_scoop_gpio);
  70
  71 unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
  72 {
  73         struct scoop_dev *sdev = dev_get_drvdata(dev);
  74         return SCOOP_REG(sdev->base,reg);
  75 }
  76
  77 void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
  78 {
  79         struct scoop_dev *sdev = dev_get_drvdata(dev);
  80         SCOOP_REG(sdev->base,reg)=data;
  81 }
  82
  83 EXPORT_SYMBOL(reset_scoop);
  84 EXPORT_SYMBOL(read_scoop_reg);
  85 EXPORT_SYMBOL(write_scoop_reg);
  86
  87 #ifdef CONFIG_PM
  88 static int scoop_suspend(struct device *dev, uint32_t state, uint32_t level)
  89 {
  90         if (level == SUSPEND_POWER_DOWN) {
  91                 struct scoop_dev *sdev = dev_get_drvdata(dev);
  92
  93                 sdev->scoop_gpwr = SCOOP_REG(sdev->base,SCOOP_GPWR);
  94                 SCOOP_REG(sdev->base,SCOOP_GPWR) = 0;
  95         }
  96         return 0;
  97 }
  98
  99 static int scoop_resume(struct device *dev, uint32_t level)
 100 {
 101         if (level == RESUME_POWER_ON) {
 102                 struct scoop_dev *sdev = dev_get_drvdata(dev);
 103
 104                 SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
 105         }
 106         return 0;
 107 }
 108 #else
 109 #define scoop_suspend   NULL
 110 #define scoop_resume    NULL
 111 #endif
 112
 113 int __init scoop_probe(struct device *dev)
 114 {
 115         struct scoop_dev *devptr;
 116         struct scoop_config *inf;
 117         struct platform_device *pdev = to_platform_device(dev);
 118         struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 119
 120         if (!mem)
 121                 return -EINVAL;
 122
 123         devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
 124
 125         if (!devptr)
 126                 return  -ENOMEM;
 127
 128         memset(devptr, 0, sizeof(struct scoop_dev));
 129         spin_lock_init(&devptr->scoop_lock);
 130
 131         inf = dev->platform_data;
 132         devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
 133
 134         if (!devptr->base) {
 135                 kfree(devptr);
 136                 return -ENOMEM;
 137         }
 138
 139         dev_set_drvdata(dev, devptr);
 140
 141         printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
 142
 143         SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
 144         reset_scoop(dev);
 145         SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
 146         SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
 147
 148         return 0;
 149 }
 150
 151 static int scoop_remove(struct device *dev)
 152 {
 153         struct scoop_dev *sdev = dev_get_drvdata(dev);
 154         if (sdev) {
 155                 iounmap(sdev->base);
 156                 kfree(sdev);
 157                 dev_set_drvdata(dev, NULL);
 158         }
 159         return 0;
 160 }
 161
 162 static struct device_driver scoop_driver = {
 163         .name           = "sharp-scoop",
 164         .bus            = &platform_bus_type,
 165         .probe          = scoop_probe,
 166         .remove         = scoop_remove,
 167         .suspend        = scoop_suspend,
 168         .resume         = scoop_resume,
 169 };
 170
 171 int __init scoop_init(void)
 172 {
 173         return driver_register(&scoop_driver);
 174 }
 175
 176 subsys_initcall(scoop_init);