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 #include <linux/pwm.h>
  26 #include <linux/leds_pwm.h>
  27
  28 #include <asm/io.h>
  29 #include <asm/setup.h>
  30
  31 #include <mach/at32ap700x.h>
  32 #include <mach/board.h>
  33 #include <mach/init.h>
  34 #include <mach/portmux.h>
  35
  36 #include "merisc.h"
  37
  38 /* Holds the autodetected board model and revision */
  39 static int merisc_board_id;
  40
  41 /* Initialized by bootloader-specific startup code. */
  42 struct tag *bootloader_tags __initdata;
  43
  44 /* Oscillator frequencies. These are board specific */
  45 unsigned long at32_board_osc_rates[3] = {
  46         [0]     = 32768,        /* 32.768 kHz on RTC osc */
  47         [1]     = 20000000,     /* 20 MHz on osc0 */
  48         [2]     = 12000000,     /* 12 MHz on osc1 */
  49 };
  50
  51 struct eth_addr {
  52         u8 addr[6];
  53 };
  54
  55 static struct eth_addr __initdata hw_addr[2];
  56 static struct macb_platform_data __initdata eth_data[2];
  57
  58 static int ads7846_get_pendown_state_PB26(void)
  59 {
  60         return !gpio_get_value(GPIO_PIN_PB(26));
  61 }
  62
  63 static int ads7846_get_pendown_state_PB28(void)
  64 {
  65         return !gpio_get_value(GPIO_PIN_PB(28));
  66 }
  67
  68 static struct ads7846_platform_data __initdata ads7846_data = {
  69         .model                          = 7846,
  70         .vref_delay_usecs               = 100,
  71         .vref_mv                        = 0,
  72         .keep_vref_on                   = 0,
  73         .settle_delay_usecs             = 150,
  74         .penirq_recheck_delay_usecs     = 1,
  75         .x_plate_ohms                   = 800,
  76         .debounce_rep                   = 4,
  77         .debounce_max                   = 10,
  78         .debounce_tol                   = 50,
  79         .get_pendown_state              = ads7846_get_pendown_state_PB26,
  80         .filter_init                    = NULL,
  81         .filter                         = NULL,
  82         .filter_cleanup                 = NULL,
  83 };
  84
  85 static struct spi_board_info __initdata spi0_board_info[] = {
  86         {
  87                 .modalias       = "ads7846",
  88                 .max_speed_hz   = 3250000,
  89                 .chip_select    = 0,
  90                 .bus_num        = 0,
  91                 .platform_data  = &ads7846_data,
  92                 .mode           = SPI_MODE_0,
  93         },
  94 };
  95
  96 static struct mci_platform_data __initdata mci0_data = {
  97         .slot[0] = {
  98                 .bus_width              = 4,
  99                 .detect_pin             = GPIO_PIN_PE(19),
 100                 .wp_pin                 = GPIO_PIN_PE(20),
 101                 .detect_is_active_high  = true,
 102         },
 103 };
 104
 105 static int __init parse_tag_ethernet(struct tag *tag)
 106 {
 107         int i;
 108
 109         i = tag->u.ethernet.mac_index;
 110         if (i < ARRAY_SIZE(hw_addr)) {
 111                 memcpy(hw_addr[i].addr, tag->u.ethernet.hw_address,
 112                        sizeof(hw_addr[i].addr));
 113         }
 114
 115         return 0;
 116 }
 117 __tagtable(ATAG_ETHERNET, parse_tag_ethernet);
 118
 119 static void __init set_hw_addr(struct platform_device *pdev)
 120 {
 121         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 122         const u8 *addr;
 123         void __iomem *regs;
 124         struct clk *pclk;
 125
 126         if (!res)
 127                 return;
 128
 129         if (pdev->id >= ARRAY_SIZE(hw_addr))
 130                 return;
 131
 132         addr = hw_addr[pdev->id].addr;
 133         if (!is_valid_ether_addr(addr))
 134                 return;
 135
 136         regs = (void __iomem __force *)res->start;
 137         pclk = clk_get(&pdev->dev, "pclk");
 138         if (IS_ERR(pclk))
 139                 return;
 140
 141         clk_enable(pclk);
 142         __raw_writel((addr[3] << 24) | (addr[2] << 16)
 143                      | (addr[1] << 8) | addr[0], regs + 0x98);
 144         __raw_writel((addr[5] << 8) | addr[4], regs + 0x9c);
 145         clk_disable(pclk);
 146         clk_put(pclk);
 147 }
 148
 149 static struct i2c_gpio_platform_data i2c_gpio_data = {
 150         .sda_pin                = GPIO_PIN_PA(6),
 151         .scl_pin                = GPIO_PIN_PA(7),
 152         .sda_is_open_drain      = 1,
 153         .scl_is_open_drain      = 1,
 154         .udelay                 = 2,
 155 };
 156
 157 static struct platform_device i2c_gpio_device = {
 158         .name   = "i2c-gpio",
 159         .id     = 0,
 160         .dev    = {
 161                 .platform_data  = &i2c_gpio_data,
 162         },
 163 };
 164
 165 static struct i2c_board_info __initdata i2c_info[] = {
 166         {
 167                 I2C_BOARD_INFO("pcf8563", 0x51)
 168         },
 169 };
 170
 171 #if IS_ENABLED(CONFIG_LEDS_PWM)
 172 static struct pwm_lookup pwm_lookup[] = {
 173         PWM_LOOKUP("at91sam9rl-pwm", 0, "leds_pwm", "backlight",
 174                    5000, PWM_POLARITY_NORMAL),
 175 };
 176
 177 static struct led_pwm pwm_leds[] = {
 178         {
 179                 .name   = "backlight",
 180                 .max_brightness = 255,
 181         },
 182 };
 183
 184 static struct led_pwm_platform_data pwm_data = {
 185         .num_leds       = ARRAY_SIZE(pwm_leds),
 186         .leds           = pwm_leds,
 187 };
 188
 189 static struct platform_device leds_pwm = {
 190         .name   = "leds_pwm",
 191         .id     = -1,
 192         .dev    = {
 193                 .platform_data = &pwm_data,
 194         },
 195 };
 196 #endif
 197
 198 const char *merisc_model(void)
 199 {
 200         switch (merisc_board_id) {
 201         case 0:
 202         case 1:
 203                 return "500-01";
 204         case 2:
 205                 return "BT";
 206         default:
 207                 return "Unknown";
 208         }
 209 }
 210
 211 const char *merisc_revision(void)
 212 {
 213         switch (merisc_board_id) {
 214         case 0:
 215                 return "B";
 216         case 1:
 217                 return "D";
 218         case 2:
 219                 return "A";
 220         default:
 221                 return "Unknown";
 222         }
 223 }
 224
 225 static void detect_merisc_board_id(void)
 226 {
 227         /* Board ID pins MUST be set as input or the board may be damaged */
 228         at32_select_gpio(GPIO_PIN_PA(24), AT32_GPIOF_PULLUP);
 229         at32_select_gpio(GPIO_PIN_PA(25), AT32_GPIOF_PULLUP);
 230         at32_select_gpio(GPIO_PIN_PA(26), AT32_GPIOF_PULLUP);
 231         at32_select_gpio(GPIO_PIN_PA(27), AT32_GPIOF_PULLUP);
 232
 233         merisc_board_id = !gpio_get_value(GPIO_PIN_PA(24)) +
 234                 !gpio_get_value(GPIO_PIN_PA(25)) * 2 +
 235                 !gpio_get_value(GPIO_PIN_PA(26)) * 4 +
 236                 !gpio_get_value(GPIO_PIN_PA(27)) * 8;
 237 }
 238
 239 void __init setup_board(void)
 240 {
 241         at32_map_usart(0, 0, 0);
 242         at32_map_usart(1, 1, 0);
 243         at32_map_usart(3, 3, 0);
 244         at32_setup_serial_console(1);
 245 }
 246
 247 static int __init merisc_init(void)
 248 {
 249         detect_merisc_board_id();
 250
 251         printk(KERN_NOTICE "BOARD: Merisc %s revision %s\n", merisc_model(),
 252                merisc_revision());
 253
 254         /* Reserve pins for SDRAM */
 255         at32_reserve_pin(GPIO_PIOE_BASE, ATMEL_EBI_PE_DATA_ALL | (1 << 26));
 256
 257         if (merisc_board_id >= 1)
 258                 at32_map_usart(2, 2, 0);
 259
 260         at32_add_device_usart(0);
 261         at32_add_device_usart(1);
 262         if (merisc_board_id >= 1)
 263                 at32_add_device_usart(2);
 264         at32_add_device_usart(3);
 265         set_hw_addr(at32_add_device_eth(0, &eth_data[0]));
 266
 267         /* ADS7846 PENIRQ */
 268         if (merisc_board_id == 0) {
 269                 ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB26;
 270                 at32_select_periph(GPIO_PIOB_BASE, 1 << 26,
 271                                    GPIO_PERIPH_A, AT32_GPIOF_PULLUP);
 272                 spi0_board_info[0].irq = AT32_EXTINT(1);
 273         } else {
 274                 ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB28;
 275                 at32_select_periph(GPIO_PIOB_BASE, 1 << 28, GPIO_PERIPH_A,
 276                                    AT32_GPIOF_PULLUP);
 277                 spi0_board_info[0].irq = AT32_EXTINT(3);
 278         }
 279
 280         /* ADS7846 busy pin */
 281         at32_select_gpio(GPIO_PIN_PA(4), AT32_GPIOF_PULLUP);
 282
 283         at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));
 284
 285         at32_add_device_mci(0, &mci0_data);
 286
 287 #if IS_ENABLED(CONFIG_LEDS_PWM)
 288         pwm_add_table(pwm_lookup, ARRAY_SIZE(pwm_lookup));
 289         at32_add_device_pwm((1 << 0) | (1 << 2));
 290         platform_device_register(&leds_pwm);
 291 #else
 292         at32_add_device_pwm((1 << 2));
 293 #endif
 294
 295         at32_select_gpio(i2c_gpio_data.sda_pin,
 296                 AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
 297         at32_select_gpio(i2c_gpio_data.scl_pin,
 298                 AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
 299         platform_device_register(&i2c_gpio_device);
 300
 301         i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info));
 302
 303         return 0;
 304 }
 305 postcore_initcall(merisc_init);