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