arch/arm/mach-ep93xx/simone.c

   1 /*
   2  * arch/arm/mach-ep93xx/simone.c
   3  * Simplemachines Sim.One support.
   4  *
   5  * Copyright (C) 2010 Ryan Mallon
   6  *
   7  * Based on the 2.6.24.7 support:
   8  *   Copyright (C) 2009 Simplemachines
   9  *   MMC support by Peter Ivanov <ivanovp@gmail.com>, 2007
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or (at
  14  * your option) any later version.
  15  *
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/i2c.h>
  22 #include <linux/i2c-gpio.h>
  23 #include <linux/mmc/host.h>
  24 #include <linux/spi/spi.h>
  25 #include <linux/spi/mmc_spi.h>
  26 #include <linux/platform_data/video-ep93xx.h>
  27 #include <linux/platform_data/spi-ep93xx.h>
  28 #include <linux/gpio.h>
  29
  30 #include <mach/hardware.h>
  31 #include <mach/gpio-ep93xx.h>
  32
  33 #include <asm/mach-types.h>
  34 #include <asm/mach/arch.h>
  35
  36 #include "soc.h"
  37
  38 static struct ep93xx_eth_data __initdata simone_eth_data = {
  39         .phy_id         = 1,
  40 };
  41
  42 static struct ep93xxfb_mach_info __initdata simone_fb_info = {
  43         .num_modes      = EP93XXFB_USE_MODEDB,
  44         .bpp            = 16,
  45         .flags          = EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
  46 };
  47
  48 /*
  49  * GPIO lines used for MMC card detection.
  50  */
  51 #define MMC_CARD_DETECT_GPIO EP93XX_GPIO_LINE_EGPIO0
  52
  53 /*
  54  * Up to v1.3, the Sim.One used SFRMOUT as SD card chip select, but this goes
  55  * low between multi-message command blocks. From v1.4, it uses a GPIO instead.
  56  * v1.3 parts will still work, since the signal on SFRMOUT is automatic.
  57  */
  58 #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO1
  59
  60 /*
  61  * MMC SPI chip select GPIO handling. If you are using SFRMOUT (SFRM1) signal,
  62  * you can leave these empty and pass NULL as .controller_data.
  63  */
  64
  65 static int simone_mmc_spi_setup(struct spi_device *spi)
  66 {
  67         unsigned int gpio = MMC_CHIP_SELECT_GPIO;
  68         int err;
  69
  70         err = gpio_request(gpio, spi->modalias);
  71         if (err)
  72                 return err;
  73
  74         err = gpio_direction_output(gpio, 1);
  75         if (err) {
  76                 gpio_free(gpio);
  77                 return err;
  78         }
  79
  80         return 0;
  81 }
  82
  83 static void simone_mmc_spi_cleanup(struct spi_device *spi)
  84 {
  85         unsigned int gpio = MMC_CHIP_SELECT_GPIO;
  86
  87         gpio_set_value(gpio, 1);
  88         gpio_direction_input(gpio);
  89         gpio_free(gpio);
  90 }
  91
  92 static void simone_mmc_spi_cs_control(struct spi_device *spi, int value)
  93 {
  94         gpio_set_value(MMC_CHIP_SELECT_GPIO, value);
  95 }
  96
  97 static struct ep93xx_spi_chip_ops simone_mmc_spi_ops = {
  98         .setup          = simone_mmc_spi_setup,
  99         .cleanup        = simone_mmc_spi_cleanup,
 100         .cs_control     = simone_mmc_spi_cs_control,
 101 };
 102
 103 /*
 104  * MMC card detection GPIO setup.
 105  */
 106
 107 static int simone_mmc_spi_init(struct device *dev,
 108         irqreturn_t (*irq_handler)(int, void *), void *mmc)
 109 {
 110         unsigned int gpio = MMC_CARD_DETECT_GPIO;
 111         int irq, err;
 112
 113         err = gpio_request(gpio, dev_name(dev));
 114         if (err)
 115                 return err;
 116
 117         err = gpio_direction_input(gpio);
 118         if (err)
 119                 goto fail;
 120
 121         irq = gpio_to_irq(gpio);
 122         if (irq < 0)
 123                 goto fail;
 124
 125         err = request_irq(irq, irq_handler, IRQF_TRIGGER_FALLING,
 126                           "MMC card detect", mmc);
 127         if (err)
 128                 goto fail;
 129
 130         printk(KERN_INFO "%s: using irq %d for MMC card detection\n",
 131                dev_name(dev), irq);
 132
 133         return 0;
 134 fail:
 135         gpio_free(gpio);
 136         return err;
 137 }
 138
 139 static void simone_mmc_spi_exit(struct device *dev, void *mmc)
 140 {
 141         unsigned int gpio = MMC_CARD_DETECT_GPIO;
 142
 143         free_irq(gpio_to_irq(gpio), mmc);
 144         gpio_free(gpio);
 145 }
 146
 147 static struct mmc_spi_platform_data simone_mmc_spi_data = {
 148         .init           = simone_mmc_spi_init,
 149         .exit           = simone_mmc_spi_exit,
 150         .detect_delay   = 500,
 151         .ocr_mask       = MMC_VDD_32_33 | MMC_VDD_33_34,
 152 };
 153
 154 static struct spi_board_info simone_spi_devices[] __initdata = {
 155         {
 156                 .modalias               = "mmc_spi",
 157                 .controller_data        = &simone_mmc_spi_ops,
 158                 .platform_data          = &simone_mmc_spi_data,
 159                 /*
 160                  * We use 10 MHz even though the maximum is 3.7 MHz. The driver
 161                  * will limit it automatically to max. frequency.
 162                  */
 163                 .max_speed_hz           = 10 * 1000 * 1000,
 164                 .bus_num                = 0,
 165                 .chip_select            = 0,
 166                 .mode                   = SPI_MODE_3,
 167         },
 168 };
 169
 170 static struct ep93xx_spi_info simone_spi_info __initdata = {
 171         .num_chipselect = ARRAY_SIZE(simone_spi_devices),
 172 };
 173
 174 static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = {
 175         .sda_pin                = EP93XX_GPIO_LINE_EEDAT,
 176         .sda_is_open_drain      = 0,
 177         .scl_pin                = EP93XX_GPIO_LINE_EECLK,
 178         .scl_is_open_drain      = 0,
 179         .udelay                 = 0,
 180         .timeout                = 0,
 181 };
 182
 183 static struct i2c_board_info __initdata simone_i2c_board_info[] = {
 184         {
 185                 I2C_BOARD_INFO("ds1337", 0x68),
 186         },
 187 };
 188
 189 static struct platform_device simone_audio_device = {
 190         .name           = "simone-audio",
 191         .id             = -1,
 192 };
 193
 194 static void __init simone_register_audio(void)
 195 {
 196         ep93xx_register_ac97();
 197         platform_device_register(&simone_audio_device);
 198 }
 199
 200 static void __init simone_init_machine(void)
 201 {
 202         ep93xx_init_devices();
 203         ep93xx_register_flash(2, EP93XX_CS6_PHYS_BASE, SZ_8M);
 204         ep93xx_register_eth(&simone_eth_data, 1);
 205         ep93xx_register_fb(&simone_fb_info);
 206         ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info,
 207                             ARRAY_SIZE(simone_i2c_board_info));
 208         ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
 209                             ARRAY_SIZE(simone_spi_devices));
 210         simone_register_audio();
 211 }
 212
 213 MACHINE_START(SIM_ONE, "Simplemachines Sim.One Board")
 214         /* Maintainer: Ryan Mallon */
 215         .atag_offset    = 0x100,
 216         .map_io         = ep93xx_map_io,
 217         .init_irq       = ep93xx_init_irq,
 218         .init_time      = ep93xx_timer_init,
 219         .init_machine   = simone_init_machine,
 220         .init_late      = ep93xx_init_late,
 221         .restart        = ep93xx_restart,
 222 MACHINE_END