linux/arch/avr32/boards/merisc/setup.c
<<
>>
Prefs
   1/*
   2 * Board-specific setup code for the Merisc
   3 *
   4 * Copyright (C) 2008 Martinsson Elektronik AB
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10#include <linux/clk.h>
  11#include <linux/etherdevice.h>
  12#include <linux/i2c.h>
  13#include <linux/i2c-gpio.h>
  14#include <linux/gpio.h>
  15#include <linux/init.h>
  16#include <linux/linkage.h>
  17#include <linux/platform_device.h>
  18#include <linux/types.h>
  19#include <linux/leds.h>
  20#include <linux/spi/spi.h>
  21#include <linux/spi/ads7846.h>
  22#include <linux/irq.h>
  23#include <linux/fb.h>
  24#include <linux/atmel-mci.h>
  25
  26#include <asm/io.h>
  27#include <asm/setup.h>
  28#include <asm/gpio.h>
  29
  30#include <mach/at32ap700x.h>
  31#include <mach/board.h>
  32#include <mach/init.h>
  33#include <mach/portmux.h>
  34
  35#include "merisc.h"
  36
  37/* Holds the autodetected board model and revision */
  38static int merisc_board_id;
  39
  40/* Initialized by bootloader-specific startup code. */
  41struct tag *bootloader_tags __initdata;
  42
  43/* Oscillator frequencies. These are board specific */
  44unsigned long at32_board_osc_rates[3] = {
  45        [0]     = 32768,        /* 32.768 kHz on RTC osc */
  46        [1]     = 20000000,     /* 20 MHz on osc0 */
  47        [2]     = 12000000,     /* 12 MHz on osc1 */
  48};
  49
  50struct eth_addr {
  51        u8 addr[6];
  52};
  53
  54static struct eth_addr __initdata hw_addr[2];
  55static struct eth_platform_data __initdata eth_data[2];
  56
  57static int ads7846_get_pendown_state_PB26(void)
  58{
  59        return !gpio_get_value(GPIO_PIN_PB(26));
  60}
  61
  62static int ads7846_get_pendown_state_PB28(void)
  63{
  64        return !gpio_get_value(GPIO_PIN_PB(28));
  65}
  66
  67static struct ads7846_platform_data __initdata ads7846_data = {
  68        .model                          = 7846,
  69        .vref_delay_usecs               = 100,
  70        .vref_mv                        = 0,
  71        .keep_vref_on                   = 0,
  72        .settle_delay_usecs             = 150,
  73        .penirq_recheck_delay_usecs     = 1,
  74        .x_plate_ohms                   = 800,
  75        .debounce_rep                   = 4,
  76        .debounce_max                   = 10,
  77        .debounce_tol                   = 50,
  78        .get_pendown_state              = ads7846_get_pendown_state_PB26,
  79        .filter_init                    = NULL,
  80        .filter                         = NULL,
  81        .filter_cleanup                 = NULL,
  82};
  83
  84static struct spi_board_info __initdata spi0_board_info[] = {
  85        {
  86                .modalias       = "ads7846",
  87                .max_speed_hz   = 3250000,
  88                .chip_select    = 0,
  89                .bus_num        = 0,
  90                .platform_data  = &ads7846_data,
  91                .mode           = SPI_MODE_0,
  92        },
  93};
  94
  95static struct mci_platform_data __initdata mci0_data = {
  96        .slot[0] = {
  97                .bus_width      = 4,
  98                .detect_pin     = GPIO_PIN_PE(19),
  99                .wp_pin         = GPIO_PIN_PE(20),
 100        },
 101};
 102
 103static int __init parse_tag_ethernet(struct tag *tag)
 104{
 105        int i;
 106
 107        i = tag->u.ethernet.mac_index;
 108        if (i < ARRAY_SIZE(hw_addr)) {
 109                memcpy(hw_addr[i].addr, tag->u.ethernet.hw_address,
 110                       sizeof(hw_addr[i].addr));
 111        }
 112
 113        return 0;
 114}
 115__tagtable(ATAG_ETHERNET, parse_tag_ethernet);
 116
 117static void __init set_hw_addr(struct platform_device *pdev)
 118{
 119        struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 120        const u8 *addr;
 121        void __iomem *regs;
 122        struct clk *pclk;
 123
 124        if (!res)
 125                return;
 126
 127        if (pdev->id >= ARRAY_SIZE(hw_addr))
 128                return;
 129
 130        addr = hw_addr[pdev->id].addr;
 131        if (!is_valid_ether_addr(addr))
 132                return;
 133
 134        regs = (void __iomem __force *)res->start;
 135        pclk = clk_get(&pdev->dev, "pclk");
 136        if (!pclk)
 137                return;
 138
 139        clk_enable(pclk);
 140        __raw_writel((addr[3] << 24) | (addr[2] << 16)
 141                     | (addr[1] << 8) | addr[0], regs + 0x98);
 142        __raw_writel((addr[5] << 8) | addr[4], regs + 0x9c);
 143        clk_disable(pclk);
 144        clk_put(pclk);
 145}
 146
 147static struct i2c_gpio_platform_data i2c_gpio_data = {
 148        .sda_pin                = GPIO_PIN_PA(6),
 149        .scl_pin                = GPIO_PIN_PA(7),
 150        .sda_is_open_drain      = 1,
 151        .scl_is_open_drain      = 1,
 152        .udelay                 = 2,
 153};
 154
 155static struct platform_device i2c_gpio_device = {
 156        .name   = "i2c-gpio",
 157        .id     = 0,
 158        .dev    = {
 159                .platform_data  = &i2c_gpio_data,
 160        },
 161};
 162
 163static struct i2c_board_info __initdata i2c_info[] = {
 164        {
 165                I2C_BOARD_INFO("pcf8563", 0x51)
 166        },
 167};
 168
 169#ifdef CONFIG_LEDS_ATMEL_PWM
 170static struct gpio_led stk_pwm_led[] = {
 171        {
 172                .name   = "backlight",
 173                .gpio   = 0,            /* PWM channel 0 (LCD backlight) */
 174        },
 175};
 176
 177static struct gpio_led_platform_data stk_pwm_led_data = {
 178        .num_leds       = ARRAY_SIZE(stk_pwm_led),
 179        .leds           = stk_pwm_led,
 180};
 181
 182static struct platform_device stk_pwm_led_dev = {
 183        .name   = "leds-atmel-pwm",
 184        .id     = -1,
 185        .dev    = {
 186                .platform_data  = &stk_pwm_led_data,
 187        },
 188};
 189#endif
 190
 191const char *merisc_model(void)
 192{
 193        switch (merisc_board_id) {
 194        case 0:
 195        case 1:
 196                return "500-01";
 197        case 2:
 198                return "BT";
 199        default:
 200                return "Unknown";
 201        }
 202}
 203
 204const char *merisc_revision(void)
 205{
 206        switch (merisc_board_id) {
 207        case 0:
 208                return "B";
 209        case 1:
 210                return "D";
 211        case 2:
 212                return "A";
 213        default:
 214                return "Unknown";
 215        }
 216}
 217
 218static void detect_merisc_board_id(void)
 219{
 220        /* Board ID pins MUST be set as input or the board may be damaged */
 221        at32_select_gpio(GPIO_PIN_PA(24), AT32_GPIOF_PULLUP);
 222        at32_select_gpio(GPIO_PIN_PA(25), AT32_GPIOF_PULLUP);
 223        at32_select_gpio(GPIO_PIN_PA(26), AT32_GPIOF_PULLUP);
 224        at32_select_gpio(GPIO_PIN_PA(27), AT32_GPIOF_PULLUP);
 225
 226        merisc_board_id = !gpio_get_value(GPIO_PIN_PA(24)) +
 227                !gpio_get_value(GPIO_PIN_PA(25)) * 2 +
 228                !gpio_get_value(GPIO_PIN_PA(26)) * 4 +
 229                !gpio_get_value(GPIO_PIN_PA(27)) * 8;
 230}
 231
 232void __init setup_board(void)
 233{
 234        at32_map_usart(0, 0, 0);
 235        at32_map_usart(1, 1, 0);
 236        at32_map_usart(3, 3, 0);
 237        at32_setup_serial_console(1);
 238}
 239
 240static int __init merisc_init(void)
 241{
 242        detect_merisc_board_id();
 243
 244        printk(KERN_NOTICE "BOARD: Merisc %s revision %s\n", merisc_model(),
 245               merisc_revision());
 246
 247        /* Reserve pins for SDRAM */
 248        at32_reserve_pin(GPIO_PIOE_BASE, ATMEL_EBI_PE_DATA_ALL | (1 << 26));
 249
 250        if (merisc_board_id >= 1)
 251                at32_map_usart(2, 2, 0);
 252
 253        at32_add_device_usart(0);
 254        at32_add_device_usart(1);
 255        if (merisc_board_id >= 1)
 256                at32_add_device_usart(2);
 257        at32_add_device_usart(3);
 258        set_hw_addr(at32_add_device_eth(0, &eth_data[0]));
 259
 260        /* ADS7846 PENIRQ */
 261        if (merisc_board_id == 0) {
 262                ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB26;
 263                at32_select_periph(GPIO_PIOB_BASE, 1 << 26,
 264                                   GPIO_PERIPH_A, AT32_GPIOF_PULLUP);
 265                spi0_board_info[0].irq = AT32_EXTINT(1);
 266        } else {
 267                ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB28;
 268                at32_select_periph(GPIO_PIOB_BASE, 1 << 28, GPIO_PERIPH_A,
 269                                   AT32_GPIOF_PULLUP);
 270                spi0_board_info[0].irq = AT32_EXTINT(3);
 271        }
 272
 273        /* ADS7846 busy pin */
 274        at32_select_gpio(GPIO_PIN_PA(4), AT32_GPIOF_PULLUP);
 275
 276        at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));
 277
 278        at32_add_device_mci(0, &mci0_data);
 279
 280#ifdef CONFIG_LEDS_ATMEL_PWM
 281        at32_add_device_pwm((1 << 0) | (1 << 2));
 282        platform_device_register(&stk_pwm_led_dev);
 283#else
 284        at32_add_device_pwm((1 << 2));
 285#endif
 286
 287        at32_select_gpio(i2c_gpio_data.sda_pin,
 288                AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
 289        at32_select_gpio(i2c_gpio_data.scl_pin,
 290                AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
 291        platform_device_register(&i2c_gpio_device);
 292
 293        i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info));
 294
 295        return 0;
 296}
 297postcore_initcall(merisc_init);
 298