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