arch/arm/mach-u300/mmc.c

   1 /*
   2  *
   3  * arch/arm/mach-u300/mmc.c
   4  *
   5  *
   6  * Copyright (C) 2009 ST-Ericsson SA
   7  * License terms: GNU General Public License (GPL) version 2
   8  *
   9  * Author: Linus Walleij <linus.walleij@stericsson.com>
  10  * Author: Johan Lundin
  11  * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
  12  */
  13 #include <linux/device.h>
  14 #include <linux/amba/bus.h>
  15 #include <linux/mmc/host.h>
  16 #include <linux/dmaengine.h>
  17 #include <linux/amba/mmci.h>
  18 #include <linux/slab.h>
  19 #include <mach/coh901318.h>
  20 #include <mach/dma_channels.h>
  21 #include <mach/gpio-u300.h>
  22
  23 #include "mmc.h"
  24 #include "padmux.h"
  25
  26 static struct mmci_platform_data mmc0_plat_data = {
  27         /*
  28          * Do not set ocr_mask or voltage translation function,
  29          * we have a regulator we can control instead.
  30          */
  31         /* Nominally 2.85V on our platform */
  32         .f_max = 24000000,
  33         .gpio_wp = -1,
  34         .gpio_cd = U300_GPIO_PIN_MMC_CD,
  35         .cd_invert = true,
  36         .capabilities = MMC_CAP_MMC_HIGHSPEED |
  37         MMC_CAP_SD_HIGHSPEED | MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA,
  38 #ifdef CONFIG_COH901318
  39         .dma_filter = coh901318_filter_id,
  40         .dma_rx_param = (void *) U300_DMA_MMCSD_RX_TX,
  41         /* Don't specify a TX channel, this RX channel is bidirectional */
  42 #endif
  43 };
  44
  45 int __devinit mmc_init(struct amba_device *adev)
  46 {
  47         struct device *mmcsd_device = &adev->dev;
  48         struct pmx *pmx;
  49         int ret = 0;
  50
  51         mmcsd_device->platform_data = &mmc0_plat_data;
  52
  53         /*
  54          * Setup padmuxing for MMC. Since this must always be
  55          * compiled into the kernel, pmx is never released.
  56          */
  57         pmx = pmx_get(mmcsd_device, U300_APP_PMX_MMC_SETTING);
  58
  59         if (IS_ERR(pmx))
  60                 pr_warning("Could not get padmux handle\n");
  61         else {
  62                 ret = pmx_activate(mmcsd_device, pmx);
  63                 if (IS_ERR_VALUE(ret))
  64                         pr_warning("Could not activate padmuxing\n");
  65         }
  66
  67         return ret;
  68 }