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         err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
  68         if (err) {
  69                 pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
  70                 return;
  71         }
  72
  73         if (gpio_debounce)
  74                 gpio_set_debounce(gpio_pendown, gpio_debounce);
  75
  76         spi_bi->bus_num = bus_num;
  77         spi_bi->irq     = gpio_to_irq(gpio_pendown);
  78
  79         if (board_pdata) {
  80                 board_pdata->gpio_pendown = gpio_pendown;
  81                 spi_bi->platform_data = board_pdata;
  82                 if (board_pdata->get_pendown_state)
  83                         gpio_export(gpio_pendown, 0);
  84         } else {
  85                 ads7846_config.gpio_pendown = gpio_pendown;
  86         }
  87
  88         if (!board_pdata || (board_pdata && !board_pdata->get_pendown_state))
  89                 gpio_free(gpio_pendown);
  90
  91         spi_register_board_info(&ads7846_spi_board_info, 1);
  92 }
  93 #else
  94 void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
  95                               struct ads7846_platform_data *board_pdata)
  96 {
  97 }
  98 #endif
  99
 100 #if defined(CONFIG_MTD_NAND_OMAP2) || defined(CONFIG_MTD_NAND_OMAP2_MODULE)
 101 static struct omap_nand_platform_data nand_data;
 102
 103 void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
 104                                  int nr_parts)
 105 {
 106         u8 cs = 0;
 107         u8 nandcs = GPMC_CS_NUM + 1;
 108
 109         /* find out the chip-select on which NAND exists */
 110         while (cs < GPMC_CS_NUM) {
 111                 u32 ret = 0;
 112                 ret = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
 113
 114                 if ((ret & 0xC00) == 0x800) {
 115                         printk(KERN_INFO "Found NAND on CS%d\n", cs);
 116                         if (nandcs > GPMC_CS_NUM)
 117                                 nandcs = cs;
 118                 }
 119                 cs++;
 120         }
 121
 122         if (nandcs > GPMC_CS_NUM) {
 123                 pr_info("NAND: Unable to find configuration in GPMC\n");
 124                 return;
 125         }
 126
 127         if (nandcs < GPMC_CS_NUM) {
 128                 nand_data.cs = nandcs;
 129                 nand_data.parts = parts;
 130                 nand_data.nr_parts = nr_parts;
 131                 nand_data.devsize = options;
 132
 133                 printk(KERN_INFO "Registering NAND on CS%d\n", nandcs);
 134                 if (gpmc_nand_init(&nand_data) < 0)
 135                         printk(KERN_ERR "Unable to register NAND device\n");
 136         }
 137 }
 138 #else
 139 void __init omap_nand_flash_init(int options, struct mtd_partition *parts,
 140                                  int nr_parts)
 141 {
 142 }
 143 #endif