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dev-spi.c

/* linux/arch/arm/mach-s5p6442/dev-spi.c
 *
 * Copyright (C) 2010 Samsung Electronics Co. Ltd.
 *    Jaswinder Singh <jassi.brar@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/gpio.h>

#include <mach/dma.h>
#include <mach/map.h>
#include <mach/irqs.h>
#include <mach/spi-clocks.h>

#include <plat/s3c64xx-spi.h>
#include <plat/gpio-cfg.h>

static char *spi_src_clks[] = {
      [S5P6442_SPI_SRCCLK_PCLK] = "pclk",
      [S5P6442_SPI_SRCCLK_SCLK] = "spi_epll",
};

/* SPI Controller platform_devices */

/* Since we emulate multi-cs capability, we do not touch the CS.
 * The emulated CS is toggled by board specific mechanism, as it can
 * be either some immediate GPIO or some signal out of some other
 * chip in between ... or some yet another way.
 * We simply do not assume anything about CS.
 */
static int s5p6442_spi_cfg_gpio(struct platform_device *pdev)
{
      switch (pdev->id) {
      case 0:
            s3c_gpio_cfgpin(S5P6442_GPB(0), S3C_GPIO_SFN(2));
            s3c_gpio_setpull(S5P6442_GPB(0), S3C_GPIO_PULL_UP);
            s3c_gpio_cfgall_range(S5P6442_GPB(2), 2,
                              S3C_GPIO_SFN(2), S3C_GPIO_PULL_UP);
            break;

      default:
            dev_err(&pdev->dev, "Invalid SPI Controller number!");
            return -EINVAL;
      }

      return 0;
}

static struct resource s5p6442_spi0_resource[] = {
      [0] = {
            .start = S5P6442_PA_SPI,
            .end   = S5P6442_PA_SPI + 0x100 - 1,
            .flags = IORESOURCE_MEM,
      },
      [1] = {
            .start = DMACH_SPI0_TX,
            .end   = DMACH_SPI0_TX,
            .flags = IORESOURCE_DMA,
      },
      [2] = {
            .start = DMACH_SPI0_RX,
            .end   = DMACH_SPI0_RX,
            .flags = IORESOURCE_DMA,
      },
      [3] = {
            .start = IRQ_SPI0,
            .end   = IRQ_SPI0,
            .flags = IORESOURCE_IRQ,
      },
};

static struct s3c64xx_spi_info s5p6442_spi0_pdata = {
      .cfg_gpio = s5p6442_spi_cfg_gpio,
      .fifo_lvl_mask = 0x1ff,
      .rx_lvl_offset = 15,
};

static u64 spi_dmamask = DMA_BIT_MASK(32);

struct platform_device s5p6442_device_spi = {
      .name         = "s3c64xx-spi",
      .id           = 0,
      .num_resources      = ARRAY_SIZE(s5p6442_spi0_resource),
      .resource     = s5p6442_spi0_resource,
      .dev = {
            .dma_mask         = &spi_dmamask,
            .coherent_dma_mask      = DMA_BIT_MASK(32),
            .platform_data = &s5p6442_spi0_pdata,
      },
};

void __init s5p6442_spi_set_info(int cntrlr, int src_clk_nr, int num_cs)
{
      struct s3c64xx_spi_info *pd;

      /* Reject invalid configuration */
      if (!num_cs || src_clk_nr < 0
                  || src_clk_nr > S5P6442_SPI_SRCCLK_SCLK) {
            printk(KERN_ERR "%s: Invalid SPI configuration\n", __func__);
            return;
      }

      switch (cntrlr) {
      case 0:
            pd = &s5p6442_spi0_pdata;
            break;
      default:
            printk(KERN_ERR "%s: Invalid SPI controller(%d)\n",
                                          __func__, cntrlr);
            return;
      }

      pd->num_cs = num_cs;
      pd->src_clk_nr = src_clk_nr;
      pd->src_clk_name = spi_src_clks[src_clk_nr];
}

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