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