arch/arm/mach-omap2/hsmmc.c

   1 /*
   2  * linux/arch/arm/mach-omap2/hsmmc.c
   3  *
   4  * Copyright (C) 2007-2008 Texas Instruments
   5  * Copyright (C) 2008 Nokia Corporation
   6  * Author: Texas Instruments
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/string.h>
  15 #include <linux/delay.h>
  16 #include <linux/gpio.h>
  17 #include <linux/mmc/host.h>
  18 #include <linux/platform_data/gpio-omap.h>
  19 #include <linux/platform_data/hsmmc-omap.h>
  20
  21 #include "soc.h"
  22 #include "omap_device.h"
  23 #include "omap-pm.h"
  24
  25 #include "hsmmc.h"
  26 #include "control.h"
  27
  28 #if IS_ENABLED(CONFIG_MMC_OMAP_HS)
  29
  30 static u16 control_pbias_offset;
  31 static u16 control_devconf1_offset;
  32
  33 #define HSMMC_NAME_LEN  9
  34
  35 static int __init omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
  36                                         struct omap_hsmmc_platform_data *mmc)
  37 {
  38         char *hc_name;
  39
  40         hc_name = kzalloc(sizeof(char) * (HSMMC_NAME_LEN + 1), GFP_KERNEL);
  41         if (!hc_name) {
  42                 kfree(hc_name);
  43                 return -ENOMEM;
  44         }
  45
  46         snprintf(hc_name, (HSMMC_NAME_LEN + 1), "mmc%islot%i", c->mmc, 1);
  47         mmc->name = hc_name;
  48         mmc->caps = c->caps;
  49         mmc->reg_offset = 0;
  50
  51         return 0;
  52 }
  53
  54 static int omap_hsmmc_done;
  55
  56 void omap_hsmmc_late_init(struct omap2_hsmmc_info *c)
  57 {
  58         struct platform_device *pdev;
  59         int res;
  60
  61         if (omap_hsmmc_done)
  62                 return;
  63
  64         omap_hsmmc_done = 1;
  65
  66         for (; c->mmc; c++) {
  67                 pdev = c->pdev;
  68                 if (!pdev)
  69                         continue;
  70                 res = omap_device_register(pdev);
  71                 if (res)
  72                         pr_err("Could not late init MMC\n");
  73         }
  74 }
  75
  76 #define MAX_OMAP_MMC_HWMOD_NAME_LEN             16
  77
  78 static void __init omap_hsmmc_init_one(struct omap2_hsmmc_info *hsmmcinfo,
  79                                         int ctrl_nr)
  80 {
  81         struct omap_hwmod *oh;
  82         struct omap_hwmod *ohs[1];
  83         struct omap_device *od;
  84         struct platform_device *pdev;
  85         char oh_name[MAX_OMAP_MMC_HWMOD_NAME_LEN];
  86         struct omap_hsmmc_platform_data *mmc_data;
  87         struct omap_hsmmc_dev_attr *mmc_dev_attr;
  88         char *name;
  89         int res;
  90
  91         mmc_data = kzalloc(sizeof(*mmc_data), GFP_KERNEL);
  92         if (!mmc_data)
  93                 return;
  94
  95         res = omap_hsmmc_pdata_init(hsmmcinfo, mmc_data);
  96         if (res < 0)
  97                 goto free_mmc;
  98
  99         name = "omap_hsmmc";
 100         res = snprintf(oh_name, MAX_OMAP_MMC_HWMOD_NAME_LEN,
 101                      "mmc%d", ctrl_nr);
 102         WARN(res >= MAX_OMAP_MMC_HWMOD_NAME_LEN,
 103              "String buffer overflow in MMC%d device setup\n", ctrl_nr);
 104
 105         oh = omap_hwmod_lookup(oh_name);
 106         if (!oh) {
 107                 pr_err("Could not look up %s\n", oh_name);
 108                 goto free_name;
 109         }
 110         ohs[0] = oh;
 111         if (oh->dev_attr != NULL) {
 112                 mmc_dev_attr = oh->dev_attr;
 113                 mmc_data->controller_flags = mmc_dev_attr->flags;
 114         }
 115
 116         pdev = platform_device_alloc(name, ctrl_nr - 1);
 117         if (!pdev) {
 118                 pr_err("Could not allocate pdev for %s\n", name);
 119                 goto free_name;
 120         }
 121         dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
 122
 123         od = omap_device_alloc(pdev, ohs, 1);
 124         if (IS_ERR(od)) {
 125                 pr_err("Could not allocate od for %s\n", name);
 126                 goto put_pdev;
 127         }
 128
 129         res = platform_device_add_data(pdev, mmc_data,
 130                               sizeof(struct omap_hsmmc_platform_data));
 131         if (res) {
 132                 pr_err("Could not add pdata for %s\n", name);
 133                 goto put_pdev;
 134         }
 135
 136         hsmmcinfo->pdev = pdev;
 137
 138         res = omap_device_register(pdev);
 139         if (res) {
 140                 pr_err("Could not register od for %s\n", name);
 141                 goto free_od;
 142         }
 143
 144         goto free_mmc;
 145
 146 free_od:
 147         omap_device_delete(od);
 148
 149 put_pdev:
 150         platform_device_put(pdev);
 151
 152 free_name:
 153         kfree(mmc_data->name);
 154
 155 free_mmc:
 156         kfree(mmc_data);
 157 }
 158
 159 void __init omap_hsmmc_init(struct omap2_hsmmc_info *controllers)
 160 {
 161         if (omap_hsmmc_done)
 162                 return;
 163
 164         omap_hsmmc_done = 1;
 165
 166         if (cpu_is_omap2430()) {
 167                 control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
 168                 control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
 169         } else {
 170                 control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
 171                 control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
 172         }
 173
 174         for (; controllers->mmc; controllers++)
 175                 omap_hsmmc_init_one(controllers, controllers->mmc);
 176
 177 }
 178
 179 #endif