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 #if defined(CONFIG_SIBYTE_SWARM) || defined(CONFIG_SIBYTE_LITTLESUR)
  13
  14 #define DRV_NAME        "pata-swarm"
  15
  16 #define SWARM_IDE_SHIFT 5
  17 #define SWARM_IDE_BASE  0x1f0
  18 #define SWARM_IDE_CTRL  0x3f6
  19
  20 static struct resource swarm_pata_resource[] = {
  21         {
  22                 .name   = "Swarm GenBus IDE",
  23                 .flags  = IORESOURCE_MEM,
  24         }, {
  25                 .name   = "Swarm GenBus IDE",
  26                 .flags  = IORESOURCE_MEM,
  27         }, {
  28                 .name   = "Swarm GenBus IDE",
  29                 .flags  = IORESOURCE_IRQ,
  30                 .start  = K_INT_GB_IDE,
  31                 .end    = K_INT_GB_IDE,
  32         },
  33 };
  34
  35 static struct pata_platform_info pata_platform_data = {
  36         .ioport_shift   = SWARM_IDE_SHIFT,
  37 };
  38
  39 static struct platform_device swarm_pata_device = {
  40         .name           = "pata_platform",
  41         .id             = -1,
  42         .resource       = swarm_pata_resource,
  43         .num_resources  = ARRAY_SIZE(swarm_pata_resource),
  44         .dev  = {
  45                 .platform_data          = &pata_platform_data,
  46                 .coherent_dma_mask      = ~0,   /* grumble */
  47         },
  48 };
  49
  50 static int __init swarm_pata_init(void)
  51 {
  52         u8 __iomem *base;
  53         phys_t offset, size;
  54         struct resource *r;
  55
  56         if (!SIBYTE_HAVE_IDE)
  57                 return -ENODEV;
  58
  59         base = ioremap(A_IO_EXT_BASE, 0x800);
  60         offset = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_START_ADDR, IDE_CS));
  61         size = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_MULT_SIZE, IDE_CS));
  62         iounmap(base);
  63
  64         offset = G_IO_START_ADDR(offset) << S_IO_ADDRBASE;
  65         size = (G_IO_MULT_SIZE(size) + 1) << S_IO_REGSIZE;
  66         if (offset < A_PHYS_GENBUS || offset >= A_PHYS_GENBUS_END) {
  67                 pr_info(DRV_NAME ": PATA interface at GenBus disabled\n");
  68
  69                 return -EBUSY;
  70         }
  71
  72         pr_info(DRV_NAME ": PATA interface at GenBus slot %i\n", IDE_CS);
  73
  74         r = swarm_pata_resource;
  75         r[0].start = offset + (SWARM_IDE_BASE << SWARM_IDE_SHIFT);
  76         r[0].end   = offset + ((SWARM_IDE_BASE + 8) << SWARM_IDE_SHIFT) - 1;
  77         r[1].start = offset + (SWARM_IDE_CTRL << SWARM_IDE_SHIFT);
  78         r[1].end   = offset + ((SWARM_IDE_CTRL + 1) << SWARM_IDE_SHIFT) - 1;
  79
  80         return platform_device_register(&swarm_pata_device);
  81 }
  82
  83 device_initcall(swarm_pata_init);
  84
  85 #endif /* defined(CONFIG_SIBYTE_SWARM) || defined(CONFIG_SIBYTE_LITTLESUR) */