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
  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 /* PCMCIA to Scoop linkage structures for pxa2xx_sharpsl.c
  24    There is no easy way to link multiple scoop devices into one
  25    single entity for the pxa2xx_pcmcia device */
  26 int scoop_num;
  27 struct scoop_pcmcia_dev *scoop_devs;
  28
  29 struct  scoop_dev {
  30         void  *base;
  31         spinlock_t scoop_lock;
  32         unsigned short suspend_clr;
  33         unsigned short suspend_set;
  34         u32 scoop_gpwr;
  35 };
  36
  37 void reset_scoop(struct device *dev)
  38 {
  39         struct scoop_dev *sdev = dev_get_drvdata(dev);
  40
  41         SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100;  // 00
  42         SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000;  // 04
  43         SCOOP_REG(sdev->base,SCOOP_CPR) = 0x0000;  // 0C
  44         SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000;  // 10
  45         SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000;  // 18
  46         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF;  // 14
  47         SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000;  // 1C
  48         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
  49 }
  50
  51 unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
  52 {
  53         unsigned short gpio_bit;
  54         unsigned long flag;
  55         struct scoop_dev *sdev = dev_get_drvdata(dev);
  56
  57         spin_lock_irqsave(&sdev->scoop_lock, flag);
  58         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
  59         SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
  60         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
  61
  62         return gpio_bit;
  63 }
  64
  65 unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
  66 {
  67         unsigned short gpio_bit;
  68         unsigned long flag;
  69         struct scoop_dev *sdev = dev_get_drvdata(dev);
  70
  71         spin_lock_irqsave(&sdev->scoop_lock, flag);
  72         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
  73         SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
  74         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
  75
  76         return gpio_bit;
  77 }
  78
  79 EXPORT_SYMBOL(set_scoop_gpio);
  80 EXPORT_SYMBOL(reset_scoop_gpio);
  81
  82 unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
  83 {
  84         struct scoop_dev *sdev = dev_get_drvdata(dev);
  85         return SCOOP_REG(sdev->base,reg);
  86 }
  87
  88 void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
  89 {
  90         struct scoop_dev *sdev = dev_get_drvdata(dev);
  91         SCOOP_REG(sdev->base,reg)=data;
  92 }
  93
  94 EXPORT_SYMBOL(reset_scoop);
  95 EXPORT_SYMBOL(read_scoop_reg);
  96 EXPORT_SYMBOL(write_scoop_reg);
  97
  98 static void check_scoop_reg(struct scoop_dev *sdev)
  99 {
 100         unsigned short mcr;
 101
 102         mcr = SCOOP_REG(sdev->base, SCOOP_MCR);
 103         if ((mcr & 0x100) == 0)
 104                 SCOOP_REG(sdev->base, SCOOP_MCR) = 0x0101;
 105 }
 106
 107 #ifdef CONFIG_PM
 108 static int scoop_suspend(struct device *dev, pm_message_t state)
 109 {
 110         struct scoop_dev *sdev = dev_get_drvdata(dev);
 111
 112         check_scoop_reg(sdev);
 113         sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR);
 114         SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set;
 115
 116         return 0;
 117 }
 118
 119 static int scoop_resume(struct device *dev)
 120 {
 121         struct scoop_dev *sdev = dev_get_drvdata(dev);
 122
 123         check_scoop_reg(sdev);
 124         SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
 125
 126         return 0;
 127 }
 128 #else
 129 #define scoop_suspend   NULL
 130 #define scoop_resume    NULL
 131 #endif
 132
 133 int __init scoop_probe(struct device *dev)
 134 {
 135         struct scoop_dev *devptr;
 136         struct scoop_config *inf;
 137         struct platform_device *pdev = to_platform_device(dev);
 138         struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 139
 140         if (!mem)
 141                 return -EINVAL;
 142
 143         devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
 144
 145         if (!devptr)
 146                 return  -ENOMEM;
 147
 148         memset(devptr, 0, sizeof(struct scoop_dev));
 149         spin_lock_init(&devptr->scoop_lock);
 150
 151         inf = dev->platform_data;
 152         devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
 153
 154         if (!devptr->base) {
 155                 kfree(devptr);
 156                 return -ENOMEM;
 157         }
 158
 159         dev_set_drvdata(dev, devptr);
 160
 161         printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
 162
 163         SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
 164         reset_scoop(dev);
 165         SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
 166         SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
 167
 168         devptr->suspend_clr = inf->suspend_clr;
 169         devptr->suspend_set = inf->suspend_set;
 170
 171         return 0;
 172 }
 173
 174 static int scoop_remove(struct device *dev)
 175 {
 176         struct scoop_dev *sdev = dev_get_drvdata(dev);
 177         if (sdev) {
 178                 iounmap(sdev->base);
 179                 kfree(sdev);
 180                 dev_set_drvdata(dev, NULL);
 181         }
 182         return 0;
 183 }
 184
 185 static struct device_driver scoop_driver = {
 186         .name           = "sharp-scoop",
 187         .bus            = &platform_bus_type,
 188         .probe          = scoop_probe,
 189         .remove         = scoop_remove,
 190         .suspend        = scoop_suspend,
 191         .resume         = scoop_resume,
 192 };
 193
 194 int __init scoop_init(void)
 195 {
 196         return driver_register(&scoop_driver);
 197 }
 198
 199 subsys_initcall(scoop_init);