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 /* PCMCIA to Scoop linkage structures for pxa2xx_sharpsl.c
  21    There is no easy way to link multiple scoop devices into one
  22    single entity for the pxa2xx_pcmcia device */
  23 int scoop_num;
  24 struct scoop_pcmcia_dev *scoop_devs;
  25
  26 struct  scoop_dev {
  27         void  *base;
  28         spinlock_t scoop_lock;
  29         u32 scoop_gpwr;
  30 };
  31
  32 void reset_scoop(struct device *dev)
  33 {
  34         struct scoop_dev *sdev = dev_get_drvdata(dev);
  35
  36         SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100;  // 00
  37         SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000;  // 04
  38         SCOOP_REG(sdev->base,SCOOP_CPR) = 0x0000;  // 0C
  39         SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000;  // 10
  40         SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000;  // 18
  41         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF;  // 14
  42         SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000;  // 1C
  43         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
  44 }
  45
  46 unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
  47 {
  48         unsigned short gpio_bit;
  49         unsigned long flag;
  50         struct scoop_dev *sdev = dev_get_drvdata(dev);
  51
  52         spin_lock_irqsave(&sdev->scoop_lock, flag);
  53         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
  54         SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
  55         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
  56
  57         return gpio_bit;
  58 }
  59
  60 unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
  61 {
  62         unsigned short gpio_bit;
  63         unsigned long flag;
  64         struct scoop_dev *sdev = dev_get_drvdata(dev);
  65
  66         spin_lock_irqsave(&sdev->scoop_lock, flag);
  67         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
  68         SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
  69         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
  70
  71         return gpio_bit;
  72 }
  73
  74 EXPORT_SYMBOL(set_scoop_gpio);
  75 EXPORT_SYMBOL(reset_scoop_gpio);
  76
  77 unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
  78 {
  79         struct scoop_dev *sdev = dev_get_drvdata(dev);
  80         return SCOOP_REG(sdev->base,reg);
  81 }
  82
  83 void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
  84 {
  85         struct scoop_dev *sdev = dev_get_drvdata(dev);
  86         SCOOP_REG(sdev->base,reg)=data;
  87 }
  88
  89 EXPORT_SYMBOL(reset_scoop);
  90 EXPORT_SYMBOL(read_scoop_reg);
  91 EXPORT_SYMBOL(write_scoop_reg);
  92
  93 #ifdef CONFIG_PM
  94 static int scoop_suspend(struct device *dev, pm_message_t state, uint32_t level)
  95 {
  96         if (level == SUSPEND_POWER_DOWN) {
  97                 struct scoop_dev *sdev = dev_get_drvdata(dev);
  98
  99                 sdev->scoop_gpwr = SCOOP_REG(sdev->base,SCOOP_GPWR);
 100                 SCOOP_REG(sdev->base,SCOOP_GPWR) = 0;
 101         }
 102         return 0;
 103 }
 104
 105 static int scoop_resume(struct device *dev, uint32_t level)
 106 {
 107         if (level == RESUME_POWER_ON) {
 108                 struct scoop_dev *sdev = dev_get_drvdata(dev);
 109
 110                 SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
 111         }
 112         return 0;
 113 }
 114 #else
 115 #define scoop_suspend   NULL
 116 #define scoop_resume    NULL
 117 #endif
 118
 119 int __init scoop_probe(struct device *dev)
 120 {
 121         struct scoop_dev *devptr;
 122         struct scoop_config *inf;
 123         struct platform_device *pdev = to_platform_device(dev);
 124         struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 125
 126         if (!mem)
 127                 return -EINVAL;
 128
 129         devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
 130
 131         if (!devptr)
 132                 return  -ENOMEM;
 133
 134         memset(devptr, 0, sizeof(struct scoop_dev));
 135         spin_lock_init(&devptr->scoop_lock);
 136
 137         inf = dev->platform_data;
 138         devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
 139
 140         if (!devptr->base) {
 141                 kfree(devptr);
 142                 return -ENOMEM;
 143         }
 144
 145         dev_set_drvdata(dev, devptr);
 146
 147         printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
 148
 149         SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
 150         reset_scoop(dev);
 151         SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
 152         SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
 153
 154         return 0;
 155 }
 156
 157 static int scoop_remove(struct device *dev)
 158 {
 159         struct scoop_dev *sdev = dev_get_drvdata(dev);
 160         if (sdev) {
 161                 iounmap(sdev->base);
 162                 kfree(sdev);
 163                 dev_set_drvdata(dev, NULL);
 164         }
 165         return 0;
 166 }
 167
 168 static struct device_driver scoop_driver = {
 169         .name           = "sharp-scoop",
 170         .bus            = &platform_bus_type,
 171         .probe          = scoop_probe,
 172         .remove         = scoop_remove,
 173         .suspend        = scoop_suspend,
 174         .resume         = scoop_resume,
 175 };
 176
 177 int __init scoop_init(void)
 178 {
 179         return driver_register(&scoop_driver);
 180 }
 181
 182 subsys_initcall(scoop_init);