arch/mips/sibyte/swarm/platform.c

   1 #include <linux/err.h>
   2 #include <linux/kernel.h>
   3 #include <linux/init.h>
   4 #include <linux/io.h>
   5 #include <linux/platform_device.h>
   6 #include <linux/ata_platform.h>
   7
   8 #include <asm/sibyte/board.h>
   9 #include <asm/sibyte/sb1250_genbus.h>
  10 #include <asm/sibyte/sb1250_regs.h>
  11
  12 #define DRV_NAME        "pata-swarm"
  13
  14 #define SWARM_IDE_SHIFT 5
  15 #define SWARM_IDE_BASE  0x1f0
  16 #define SWARM_IDE_CTRL  0x3f6
  17
  18 static struct resource swarm_pata_resource[] = {
  19         {
  20                 .name   = "Swarm GenBus IDE",
  21                 .flags  = IORESOURCE_MEM,
  22         }, {
  23                 .name   = "Swarm GenBus IDE",
  24                 .flags  = IORESOURCE_MEM,
  25         }, {
  26                 .name   = "Swarm GenBus IDE",
  27                 .flags  = IORESOURCE_IRQ,
  28                 .start  = K_INT_GB_IDE,
  29                 .end    = K_INT_GB_IDE,
  30         },
  31 };
  32
  33 static struct pata_platform_info pata_platform_data = {
  34         .ioport_shift   = SWARM_IDE_SHIFT,
  35 };
  36
  37 static struct platform_device swarm_pata_device = {
  38         .name           = "pata_platform",
  39         .id             = -1,
  40         .resource       = swarm_pata_resource,
  41         .num_resources  = ARRAY_SIZE(swarm_pata_resource),
  42         .dev  = {
  43                 .platform_data          = &pata_platform_data,
  44                 .coherent_dma_mask      = ~0,   /* grumble */
  45         },
  46 };
  47
  48 static int __init swarm_pata_init(void)
  49 {
  50         u8 __iomem *base;
  51         phys_t offset, size;
  52         struct resource *r;
  53
  54         if (!SIBYTE_HAVE_IDE)
  55                 return -ENODEV;
  56
  57         base = ioremap(A_IO_EXT_BASE, 0x800);
  58         offset = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_START_ADDR, IDE_CS));
  59         size = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_MULT_SIZE, IDE_CS));
  60         iounmap(base);
  61
  62         offset = G_IO_START_ADDR(offset) << S_IO_ADDRBASE;
  63         size = (G_IO_MULT_SIZE(size) + 1) << S_IO_REGSIZE;
  64         if (offset < A_PHYS_GENBUS || offset >= A_PHYS_GENBUS_END) {
  65                 pr_info(DRV_NAME ": PATA interface at GenBus disabled\n");
  66
  67                 return -EBUSY;
  68         }
  69
  70         pr_info(DRV_NAME ": PATA interface at GenBus slot %i\n", IDE_CS);
  71
  72         r = swarm_pata_resource;
  73         r[0].start = offset + (SWARM_IDE_BASE << SWARM_IDE_SHIFT);
  74         r[0].end   = offset + ((SWARM_IDE_BASE + 8) << SWARM_IDE_SHIFT) - 1;
  75         r[1].start = offset + (SWARM_IDE_CTRL << SWARM_IDE_SHIFT);
  76         r[1].end   = offset + ((SWARM_IDE_CTRL + 1) << SWARM_IDE_SHIFT) - 1;
  77
  78         return platform_device_register(&swarm_pata_device);
  79 }
  80
  81 device_initcall(swarm_pata_init);