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 .detect_is_active_high = true, 101 }, 102}; 103 104static 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 118static 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 (!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 148static 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 156static struct platform_device i2c_gpio_device = { 157 .name = "i2c-gpio", 158 .id = 0, 159 .dev = { 160 .platform_data = &i2c_gpio_data, 161 }, 162}; 163 164static struct i2c_board_info __initdata i2c_info[] = { 165 { 166 I2C_BOARD_INFO("pcf8563", 0x51) 167 }, 168}; 169 170#ifdef CONFIG_LEDS_ATMEL_PWM 171static struct gpio_led stk_pwm_led[] = { 172 { 173 .name = "backlight", 174 .gpio = 0, /* PWM channel 0 (LCD backlight) */ 175 }, 176}; 177 178static struct gpio_led_platform_data stk_pwm_led_data = { 179 .num_leds = ARRAY_SIZE(stk_pwm_led), 180 .leds = stk_pwm_led, 181}; 182 183static 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 192const 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 205const 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 219static 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 233void __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 241static 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, ð_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} 298postcore_initcall(merisc_init); 299