arch/arm/mach-omap2/common-board-devices.c

   1 /*
   2  * common-board-devices.c
   3  *
   4  * Copyright (C) 2011 CompuLab, Ltd.
   5  * Author: Mike Rapoport <mike@compulab.co.il>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  19  * 02110-1301 USA
  20  *
  21  */
  22
  23 #include <linux/gpio.h>
  24 #include <linux/spi/spi.h>
  25 #include <linux/spi/ads7846.h>
  26
  27 #include <plat/mcspi.h>
  28 #include <plat/nand.h>
  29
  30 #include "common-board-devices.h"
  31
  32 #if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
  33         defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
  34 static struct omap2_mcspi_device_config ads7846_mcspi_config = {
  35         .turbo_mode     = 0,
  36 };
  37
  38 /*
  39  * ADS7846 driver maybe request a gpio according to the value
  40  * of pdata->get_pendown_state, but we have done this. So set
  41  * get_pendown_state to avoid twice gpio requesting.
  42  */
  43 static int omap3_get_pendown_state(void)
  44 {
  45         return !gpio_get_value(OMAP3_EVM_TS_GPIO);
  46 }
  47
  48 static struct ads7846_platform_data ads7846_config = {
  49         .x_max                  = 0x0fff,
  50         .y_max                  = 0x0fff,
  51         .x_plate_ohms           = 180,
  52         .pressure_max           = 255,
  53         .debounce_max           = 10,
  54         .debounce_tol           = 3,
  55         .debounce_rep           = 1,
  56         .gpio_pendown           = -EINVAL,
  57         .keep_vref_on           = 1,
  58         .get_pendown_state      = &omap3_get_pendown_state,
  59 };
  60
  61 static struct spi_board_info ads7846_spi_board_info __initdata = {
  62         .modalias               = "ads7846",
  63         .bus_num                = -EINVAL,
  64         .chip_select            = 0,
  65         .max_speed_hz           = 1500000,
  66         .controller_data        = &ads7846_mcspi_config,
  67         .irq                    = -EINVAL,
  68         .platform_data          = &ads7846_config,
  69 };
  70
  71 void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
  72                               struct ads7846_platform_data *board_pdata)
  73 {
  74         struct spi_board_info *spi_bi = &ads7846_spi_board_info;
  75         int err;
  76
  77         err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
  78         if (err) {
  79                 pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
  80                 return;
  81         }
  82
  83         if (gpio_debounce)
  84                 gpio_set_debounce(gpio_pendown, gpio_debounce);
  85
  86         spi_bi->bus_num = bus_num;
  87         spi_bi->irq     = gpio_to_irq(gpio_pendown);
  88
  89         if (board_pdata) {
  90                 board_pdata->gpio_pendown = gpio_pendown;
  91                 spi_bi->platform_data = board_pdata;
  92                 if (board_pdata->get_pendown_state)
  93                         gpio_export(gpio_pendown, 0);
  94         } else {
  95                 ads7846_config.gpio_pendown = gpio_pendown;
  96         }
  97
  98         if (!board_pdata || (board_pdata && !board_pdata->get_pendown_state))
  99                 gpio_free(gpio_pendown);
 100
 101         spi_register_board_info(&ads7846_spi_board_info, 1);
 102 }
 103 #else
 104 void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
 105                               struct ads7846_platform_data *board_pdata)
 106 {
 107 }
 108 #endif
 109
 110 #if defined(CONFIG_MTD_NAND_OMAP2) || defined(CONFIG_MTD_NAND_OMAP2_MODULE)
 111 static struct omap_nand_platform_data nand_data;
 112
 113 void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
 114                                  int nr_parts)
 115 {
 116         u8 cs = 0;
 117         u8 nandcs = GPMC_CS_NUM + 1;
 118
 119         /* find out the chip-select on which NAND exists */
 120         while (cs < GPMC_CS_NUM) {
 121                 u32 ret = 0;
 122                 ret = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
 123
 124                 if ((ret & 0xC00) == 0x800) {
 125                         printk(KERN_INFO "Found NAND on CS%d\n", cs);
 126                         if (nandcs > GPMC_CS_NUM)
 127                                 nandcs = cs;
 128                 }
 129                 cs++;
 130         }
 131
 132         if (nandcs > GPMC_CS_NUM) {
 133                 printk(KERN_INFO "NAND: Unable to find configuration "
 134                                  "in GPMC\n ");
 135                 return;
 136         }
 137
 138         if (nandcs < GPMC_CS_NUM) {
 139                 nand_data.cs = nandcs;
 140                 nand_data.parts = parts;
 141                 nand_data.nr_parts = nr_parts;
 142                 nand_data.devsize = options;
 143
 144                 printk(KERN_INFO "Registering NAND on CS%d\n", nandcs);
 145                 if (gpmc_nand_init(&nand_data) < 0)
 146                         printk(KERN_ERR "Unable to register NAND device\n");
 147         }
 148 }
 149 #else
 150 void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
 151                                  int nr_parts)
 152 {
 153 }
 154 #endif