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 <linux/platform_data/spi-omap2-mcspi.h>
  28 #include <linux/platform_data/mtd-nand-omap2.h>
  29
  30 #include "common.h"
  31 #include "common-board-devices.h"
  32
  33 #if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
  34         defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
  35 static struct omap2_mcspi_device_config ads7846_mcspi_config = {
  36         .turbo_mode     = 0,
  37 };
  38
  39 static struct ads7846_platform_data ads7846_config = {
  40         .x_max                  = 0x0fff,
  41         .y_max                  = 0x0fff,
  42         .x_plate_ohms           = 180,
  43         .pressure_max           = 255,
  44         .debounce_max           = 10,
  45         .debounce_tol           = 3,
  46         .debounce_rep           = 1,
  47         .gpio_pendown           = -EINVAL,
  48         .keep_vref_on           = 1,
  49 };
  50
  51 static struct spi_board_info ads7846_spi_board_info __initdata = {
  52         .modalias               = "ads7846",
  53         .bus_num                = -EINVAL,
  54         .chip_select            = 0,
  55         .max_speed_hz           = 1500000,
  56         .controller_data        = &ads7846_mcspi_config,
  57         .irq                    = -EINVAL,
  58         .platform_data          = &ads7846_config,
  59 };
  60
  61 void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
  62                               struct ads7846_platform_data *board_pdata)
  63 {
  64         struct spi_board_info *spi_bi = &ads7846_spi_board_info;
  65         int err;
  66
  67         /*
  68          * If a board defines get_pendown_state() function, request the pendown
  69          * GPIO and set the GPIO debounce time.
  70          * If a board does not define the get_pendown_state() function, then
  71          * the ads7846 driver will setup the pendown GPIO itself.
  72          */
  73         if (board_pdata && board_pdata->get_pendown_state) {
  74                 err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
  75                 if (err) {
  76                         pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
  77                         return;
  78                 }
  79
  80                 if (gpio_debounce)
  81                         gpio_set_debounce(gpio_pendown, gpio_debounce);
  82
  83                 gpio_export(gpio_pendown, 0);
  84         }
  85
  86         spi_bi->bus_num = bus_num;
  87         spi_bi->irq     = gpio_to_irq(gpio_pendown);
  88
  89         ads7846_config.gpio_pendown = gpio_pendown;
  90
  91         if (board_pdata) {
  92                 board_pdata->gpio_pendown = gpio_pendown;
  93                 board_pdata->gpio_pendown_debounce = gpio_debounce;
  94                 spi_bi->platform_data = board_pdata;
  95         }
  96
  97         spi_register_board_info(&ads7846_spi_board_info, 1);
  98 }
  99 #else
 100 void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
 101                               struct ads7846_platform_data *board_pdata)
 102 {
 103 }
 104 #endif
 105
 106 #if defined(CONFIG_MTD_NAND_OMAP2) || defined(CONFIG_MTD_NAND_OMAP2_MODULE)
 107 static struct omap_nand_platform_data nand_data;
 108
 109 void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
 110                                  int nr_parts)
 111 {
 112         u8 cs = 0;
 113         u8 nandcs = GPMC_CS_NUM + 1;
 114
 115         /* find out the chip-select on which NAND exists */
 116         while (cs < GPMC_CS_NUM) {
 117                 u32 ret = 0;
 118                 ret = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
 119
 120                 if ((ret & 0xC00) == 0x800) {
 121                         printk(KERN_INFO "Found NAND on CS%d\n", cs);
 122                         if (nandcs > GPMC_CS_NUM)
 123                                 nandcs = cs;
 124                 }
 125                 cs++;
 126         }
 127
 128         if (nandcs > GPMC_CS_NUM) {
 129                 pr_info("NAND: Unable to find configuration in GPMC\n");
 130                 return;
 131         }
 132
 133         if (nandcs < GPMC_CS_NUM) {
 134                 nand_data.cs = nandcs;
 135                 nand_data.parts = parts;
 136                 nand_data.nr_parts = nr_parts;
 137                 nand_data.devsize = options;
 138
 139                 printk(KERN_INFO "Registering NAND on CS%d\n", nandcs);
 140                 if (gpmc_nand_init(&nand_data) < 0)
 141                         printk(KERN_ERR "Unable to register NAND device\n");
 142         }
 143 }
 144 #else
 145 void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
 146                                  int nr_parts)
 147 {
 148 }
 149 #endif