arch/avr32/boards/merisc/setup.c

   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 */
  38 static int merisc_board_id;
  39
  40 /* Initialized by bootloader-specific startup code. */
  41 struct tag *bootloader_tags __initdata;
  42
  43 /* Oscillator frequencies. These are board specific */
  44 unsigned 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
  50 struct eth_addr {
  51         u8 addr[6];
  52 };
  53
  54 static struct eth_addr __initdata hw_addr[2];
  55 static struct eth_platform_data __initdata eth_data[2];
  56
  57 static int ads7846_get_pendown_state_PB26(void)
  58 {
  59         return !gpio_get_value(GPIO_PIN_PB(26));
  60 }
  61
  62 static int ads7846_get_pendown_state_PB28(void)
  63 {
  64         return !gpio_get_value(GPIO_PIN_PB(28));
  65 }
  66
  67 static 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
  84 static 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
  95 static 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                 .detect_is_active_high  = true,
 101         },
 102 };
 103
 104 static int __init parse_tag_ethernet(struct tag *tag)
 105 {
 106         int i;
 107
 108         i = tag->u.ethernet.mac_index;
 109         if (i < ARRAY_SIZE(hw_addr)) {
 110                 memcpy(hw_addr[i].addr, tag->u.ethernet.hw_address,
 111                        sizeof(hw_addr[i].addr));
 112         }
 113
 114         return 0;
 115 }
 116 __tagtable(ATAG_ETHERNET, parse_tag_ethernet);
 117
 118 static void __init set_hw_addr(struct platform_device *pdev)
 119 {
 120         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 121         const u8 *addr;
 122         void __iomem *regs;
 123         struct clk *pclk;
 124
 125         if (!res)
 126                 return;
 127
 128         if (pdev->id >= ARRAY_SIZE(hw_addr))
 129                 return;
 130
 131         addr = hw_addr[pdev->id].addr;
 132         if (!is_valid_ether_addr(addr))
 133                 return;
 134
 135         regs = (void __iomem __force *)res->start;
 136         pclk = clk_get(&pdev->dev, "pclk");
 137         if (IS_ERR(pclk))
 138                 return;
 139
 140         clk_enable(pclk);
 141         __raw_writel((addr[3] << 24) | (addr[2] << 16)
 142                      | (addr[1] << 8) | addr[0], regs + 0x98);
 143         __raw_writel((addr[5] << 8) | addr[4], regs + 0x9c);
 144         clk_disable(pclk);
 145         clk_put(pclk);
 146 }
 147
 148 static struct i2c_gpio_platform_data i2c_gpio_data = {
 149         .sda_pin                = GPIO_PIN_PA(6),
 150         .scl_pin                = GPIO_PIN_PA(7),
 151         .sda_is_open_drain      = 1,
 152         .scl_is_open_drain      = 1,
 153         .udelay                 = 2,
 154 };
 155
 156 static struct platform_device i2c_gpio_device = {
 157         .name   = "i2c-gpio",
 158         .id     = 0,
 159         .dev    = {
 160                 .platform_data  = &i2c_gpio_data,
 161         },
 162 };
 163
 164 static struct i2c_board_info __initdata i2c_info[] = {
 165         {
 166                 I2C_BOARD_INFO("pcf8563", 0x51)
 167         },
 168 };
 169
 170 #ifdef CONFIG_LEDS_ATMEL_PWM
 171 static struct gpio_led stk_pwm_led[] = {
 172         {
 173                 .name   = "backlight",
 174                 .gpio   = 0,            /* PWM channel 0 (LCD backlight) */
 175         },
 176 };
 177
 178 static struct gpio_led_platform_data stk_pwm_led_data = {
 179         .num_leds       = ARRAY_SIZE(stk_pwm_led),
 180         .leds           = stk_pwm_led,
 181 };
 182
 183 static struct platform_device stk_pwm_led_dev = {
 184         .name   = "leds-atmel-pwm",
 185         .id     = -1,
 186         .dev    = {
 187                 .platform_data  = &stk_pwm_led_data,
 188         },
 189 };
 190 #endif
 191
 192 const char *merisc_model(void)
 193 {
 194         switch (merisc_board_id) {
 195         case 0:
 196         case 1:
 197                 return "500-01";
 198         case 2:
 199                 return "BT";
 200         default:
 201                 return "Unknown";
 202         }
 203 }
 204
 205 const char *merisc_revision(void)
 206 {
 207         switch (merisc_board_id) {
 208         case 0:
 209                 return "B";
 210         case 1:
 211                 return "D";
 212         case 2:
 213                 return "A";
 214         default:
 215                 return "Unknown";
 216         }
 217 }
 218
 219 static void detect_merisc_board_id(void)
 220 {
 221         /* Board ID pins MUST be set as input or the board may be damaged */
 222         at32_select_gpio(GPIO_PIN_PA(24), AT32_GPIOF_PULLUP);
 223         at32_select_gpio(GPIO_PIN_PA(25), AT32_GPIOF_PULLUP);
 224         at32_select_gpio(GPIO_PIN_PA(26), AT32_GPIOF_PULLUP);
 225         at32_select_gpio(GPIO_PIN_PA(27), AT32_GPIOF_PULLUP);
 226
 227         merisc_board_id = !gpio_get_value(GPIO_PIN_PA(24)) +
 228                 !gpio_get_value(GPIO_PIN_PA(25)) * 2 +
 229                 !gpio_get_value(GPIO_PIN_PA(26)) * 4 +
 230                 !gpio_get_value(GPIO_PIN_PA(27)) * 8;
 231 }
 232
 233 void __init setup_board(void)
 234 {
 235         at32_map_usart(0, 0, 0);
 236         at32_map_usart(1, 1, 0);
 237         at32_map_usart(3, 3, 0);
 238         at32_setup_serial_console(1);
 239 }
 240
 241 static int __init merisc_init(void)
 242 {
 243         detect_merisc_board_id();
 244
 245         printk(KERN_NOTICE "BOARD: Merisc %s revision %s\n", merisc_model(),
 246                merisc_revision());
 247
 248         /* Reserve pins for SDRAM */
 249         at32_reserve_pin(GPIO_PIOE_BASE, ATMEL_EBI_PE_DATA_ALL | (1 << 26));
 250
 251         if (merisc_board_id >= 1)
 252                 at32_map_usart(2, 2, 0);
 253
 254         at32_add_device_usart(0);
 255         at32_add_device_usart(1);
 256         if (merisc_board_id >= 1)
 257                 at32_add_device_usart(2);
 258         at32_add_device_usart(3);
 259         set_hw_addr(at32_add_device_eth(0, &eth_data[0]));
 260
 261         /* ADS7846 PENIRQ */
 262         if (merisc_board_id == 0) {
 263                 ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB26;
 264                 at32_select_periph(GPIO_PIOB_BASE, 1 << 26,
 265                                    GPIO_PERIPH_A, AT32_GPIOF_PULLUP);
 266                 spi0_board_info[0].irq = AT32_EXTINT(1);
 267         } else {
 268                 ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB28;
 269                 at32_select_periph(GPIO_PIOB_BASE, 1 << 28, GPIO_PERIPH_A,
 270                                    AT32_GPIOF_PULLUP);
 271                 spi0_board_info[0].irq = AT32_EXTINT(3);
 272         }
 273
 274         /* ADS7846 busy pin */
 275         at32_select_gpio(GPIO_PIN_PA(4), AT32_GPIOF_PULLUP);
 276
 277         at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));
 278
 279         at32_add_device_mci(0, &mci0_data);
 280
 281 #ifdef CONFIG_LEDS_ATMEL_PWM
 282         at32_add_device_pwm((1 << 0) | (1 << 2));
 283         platform_device_register(&stk_pwm_led_dev);
 284 #else
 285         at32_add_device_pwm((1 << 2));
 286 #endif
 287
 288         at32_select_gpio(i2c_gpio_data.sda_pin,
 289                 AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
 290         at32_select_gpio(i2c_gpio_data.scl_pin,
 291                 AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
 292         platform_device_register(&i2c_gpio_device);
 293
 294         i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info));
 295
 296         return 0;
 297 }
 298 postcore_initcall(merisc_init);