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platform.c

#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/ata_platform.h>

#include <asm/sibyte/board.h>
#include <asm/sibyte/sb1250_genbus.h>
#include <asm/sibyte/sb1250_regs.h>

#define DRV_NAME  "pata-swarm"

#define SWARM_IDE_SHIFT 5
#define SWARM_IDE_BASE  0x1f0
#define SWARM_IDE_CTRL  0x3f6

static struct resource swarm_pata_resource[] = {
      {
            .name = "Swarm GenBus IDE",
            .flags      = IORESOURCE_MEM,
      }, {
            .name = "Swarm GenBus IDE",
            .flags      = IORESOURCE_MEM,
      }, {
            .name = "Swarm GenBus IDE",
            .flags      = IORESOURCE_IRQ,
            .start      = K_INT_GB_IDE,
            .end  = K_INT_GB_IDE,
      },
};

static struct pata_platform_info pata_platform_data = {
      .ioport_shift     = SWARM_IDE_SHIFT,
};

static struct platform_device swarm_pata_device = {
      .name       = "pata_platform",
      .id         = -1,
      .resource   = swarm_pata_resource,
      .num_resources    = ARRAY_SIZE(swarm_pata_resource),
      .dev  = {
            .platform_data          = &pata_platform_data,
            .coherent_dma_mask      = ~0, /* grumble */
      },
};

static int __init swarm_pata_init(void)
{
      u8 __iomem *base;
      phys_t offset, size;
      struct resource *r;

      if (!SIBYTE_HAVE_IDE)
            return -ENODEV;

      base = ioremap(A_IO_EXT_BASE, 0x800);
      offset = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_START_ADDR, IDE_CS));
      size = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_MULT_SIZE, IDE_CS));
      iounmap(base);

      offset = G_IO_START_ADDR(offset) << S_IO_ADDRBASE;
      size = (G_IO_MULT_SIZE(size) + 1) << S_IO_REGSIZE;
      if (offset < A_PHYS_GENBUS || offset >= A_PHYS_GENBUS_END) {
            pr_info(DRV_NAME ": PATA interface at GenBus disabled\n");

            return -EBUSY;
      }

      pr_info(DRV_NAME ": PATA interface at GenBus slot %i\n", IDE_CS);

      r = swarm_pata_resource;
      r[0].start = offset + (SWARM_IDE_BASE << SWARM_IDE_SHIFT);
      r[0].end   = offset + ((SWARM_IDE_BASE + 8) << SWARM_IDE_SHIFT) - 1;
      r[1].start = offset + (SWARM_IDE_CTRL << SWARM_IDE_SHIFT);
      r[1].end   = offset + ((SWARM_IDE_CTRL + 1) << SWARM_IDE_SHIFT) - 1;

      return platform_device_register(&swarm_pata_device);
}

device_initcall(swarm_pata_init);

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