kernel/arch/avr32/boards/favr-32/setup.c

   1 /*
   2  * Favr-32 board-specific setup code.
   3  *
   4  * Copyright (C) 2008 Atmel Corporation
   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/bootmem.h>
  13 #include <linux/fb.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/types.h>
  17 #include <linux/linkage.h>
  18 #include <linux/gpio.h>
  19 #include <linux/leds.h>
  20 #include <linux/atmel-mci.h>
  21 #include <linux/pwm.h>
  22 #include <linux/pwm_backlight.h>
  23 #include <linux/regulator/fixed.h>
  24 #include <linux/regulator/machine.h>
  25 #include <linux/spi/spi.h>
  26 #include <linux/spi/ads7846.h>
  27
  28 #include <sound/atmel-abdac.h>
  29
  30 #include <video/atmel_lcdc.h>
  31
  32 #include <asm/setup.h>
  33
  34 #include <mach/at32ap700x.h>
  35 #include <mach/init.h>
  36 #include <mach/board.h>
  37 #include <mach/portmux.h>
  38
  39 #define PWM_BL_CH 2
  40
  41 /* Oscillator frequencies. These are board-specific */
  42 unsigned long at32_board_osc_rates[3] = {
  43         [0] = 32768,    /* 32.768 kHz on RTC osc */
  44         [1] = 20000000, /* 20 MHz on osc0 */
  45         [2] = 12000000, /* 12 MHz on osc1 */
  46 };
  47
  48 /* Initialized by bootloader-specific startup code. */
  49 struct tag *bootloader_tags __initdata;
  50
  51 static struct atmel_abdac_pdata __initdata abdac0_data = {
  52 };
  53
  54 struct eth_addr {
  55         u8 addr[6];
  56 };
  57 static struct eth_addr __initdata hw_addr[1];
  58 static struct macb_platform_data __initdata eth_data[1] = {
  59         {
  60                 .phy_mask       = ~(1U << 1),
  61         },
  62 };
  63
  64 static int ads7843_get_pendown_state(void)
  65 {
  66         return !gpio_get_value(GPIO_PIN_PB(3));
  67 }
  68
  69 static struct ads7846_platform_data ads7843_data = {
  70         .model                  = 7843,
  71         .get_pendown_state      = ads7843_get_pendown_state,
  72         .pressure_max           = 255,
  73         /*
  74          * Values below are for debounce filtering, these can be experimented
  75          * with further.
  76          */
  77         .debounce_max           = 20,
  78         .debounce_rep           = 4,
  79         .debounce_tol           = 5,
  80
  81         .keep_vref_on           = true,
  82         .settle_delay_usecs     = 500,
  83         .penirq_recheck_delay_usecs = 100,
  84 };
  85
  86 static struct spi_board_info __initdata spi1_board_info[] = {
  87         {
  88                 /* ADS7843 touch controller */
  89                 .modalias       = "ads7846",
  90                 .max_speed_hz   = 2000000,
  91                 .chip_select    = 0,
  92                 .bus_num        = 1,
  93                 .platform_data  = &ads7843_data,
  94         },
  95 };
  96
  97 static struct mci_platform_data __initdata mci0_data = {
  98         .slot[0] = {
  99                 .bus_width      = 4,
 100                 .detect_pin     = -ENODEV,
 101                 .wp_pin         = -ENODEV,
 102         },
 103 };
 104
 105 static struct fb_videomode __initdata lb104v03_modes[] = {
 106         {
 107                 .name           = "640x480 @ 50",
 108                 .refresh        = 50,
 109                 .xres           = 640,          .yres           = 480,
 110                 .pixclock       = KHZ2PICOS(25100),
 111
 112                 .left_margin    = 90,           .right_margin   = 70,
 113                 .upper_margin   = 30,           .lower_margin   = 15,
 114                 .hsync_len      = 12,           .vsync_len      = 2,
 115
 116                 .sync           = 0,
 117                 .vmode          = FB_VMODE_NONINTERLACED,
 118         },
 119 };
 120
 121 static struct fb_monspecs __initdata favr32_default_monspecs = {
 122         .manufacturer           = "LG",
 123         .monitor                = "LB104V03",
 124         .modedb                 = lb104v03_modes,
 125         .modedb_len             = ARRAY_SIZE(lb104v03_modes),
 126         .hfmin                  = 27273,
 127         .hfmax                  = 31111,
 128         .vfmin                  = 45,
 129         .vfmax                  = 60,
 130         .dclkmax                = 28000000,
 131 };
 132
 133 struct atmel_lcdfb_pdata __initdata favr32_lcdc_data = {
 134         .default_bpp            = 16,
 135         .default_dmacon         = ATMEL_LCDC_DMAEN | ATMEL_LCDC_DMA2DEN,
 136         .default_lcdcon2        = (ATMEL_LCDC_DISTYPE_TFT
 137                                    | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE
 138                                    | ATMEL_LCDC_MEMOR_BIG),
 139         .default_monspecs       = &favr32_default_monspecs,
 140         .guard_time             = 2,
 141 };
 142
 143 static struct gpio_led favr32_leds[] = {
 144         {
 145                 .name            = "green",
 146                 .gpio            = GPIO_PIN_PE(19),
 147                 .default_trigger = "heartbeat",
 148                 .active_low      = 1,
 149         },
 150         {
 151                 .name            = "red",
 152                 .gpio            = GPIO_PIN_PE(20),
 153                 .active_low      = 1,
 154         },
 155 };
 156
 157 static struct gpio_led_platform_data favr32_led_data = {
 158         .num_leds       = ARRAY_SIZE(favr32_leds),
 159         .leds           = favr32_leds,
 160 };
 161
 162 static struct platform_device favr32_led_dev = {
 163         .name           = "leds-gpio",
 164         .id             = 0,
 165         .dev            = {
 166                 .platform_data  = &favr32_led_data,
 167         },
 168 };
 169
 170 /*
 171  * The next two functions should go away as the boot loader is
 172  * supposed to initialize the macb address registers with a valid
 173  * ethernet address. But we need to keep it around for a while until
 174  * we can be reasonably sure the boot loader does this.
 175  *
 176  * The phy_id is ignored as the driver will probe for it.
 177  */
 178 static int __init parse_tag_ethernet(struct tag *tag)
 179 {
 180         int i;
 181
 182         i = tag->u.ethernet.mac_index;
 183         if (i < ARRAY_SIZE(hw_addr))
 184                 memcpy(hw_addr[i].addr, tag->u.ethernet.hw_address,
 185                        sizeof(hw_addr[i].addr));
 186
 187         return 0;
 188 }
 189 __tagtable(ATAG_ETHERNET, parse_tag_ethernet);
 190
 191 static void __init set_hw_addr(struct platform_device *pdev)
 192 {
 193         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 194         const u8 *addr;
 195         void __iomem *regs;
 196         struct clk *pclk;
 197
 198         if (!res)
 199                 return;
 200         if (pdev->id >= ARRAY_SIZE(hw_addr))
 201                 return;
 202
 203         addr = hw_addr[pdev->id].addr;
 204         if (!is_valid_ether_addr(addr))
 205                 return;
 206
 207         /*
 208          * Since this is board-specific code, we'll cheat and use the
 209          * physical address directly as we happen to know that it's
 210          * the same as the virtual address.
 211          */
 212         regs = (void __iomem __force *)res->start;
 213         pclk = clk_get(&pdev->dev, "pclk");
 214         if (IS_ERR(pclk))
 215                 return;
 216
 217         clk_enable(pclk);
 218         __raw_writel((addr[3] << 24) | (addr[2] << 16)
 219                      | (addr[1] << 8) | addr[0], regs + 0x98);
 220         __raw_writel((addr[5] << 8) | addr[4], regs + 0x9c);
 221         clk_disable(pclk);
 222         clk_put(pclk);
 223 }
 224
 225 void __init favr32_setup_leds(void)
 226 {
 227         unsigned i;
 228
 229         for (i = 0; i < ARRAY_SIZE(favr32_leds); i++)
 230                 at32_select_gpio(favr32_leds[i].gpio, AT32_GPIOF_OUTPUT);
 231
 232         platform_device_register(&favr32_led_dev);
 233 }
 234
 235 static struct pwm_lookup pwm_lookup[] = {
 236         PWM_LOOKUP("at91sam9rl-pwm", PWM_BL_CH, "pwm-backlight.0", NULL,
 237                    5000, PWM_POLARITY_INVERSED),
 238 };
 239
 240 static struct regulator_consumer_supply fixed_power_consumers[] = {
 241         REGULATOR_SUPPLY("power", "pwm-backlight.0"),
 242 };
 243
 244 static struct platform_pwm_backlight_data pwm_bl_data = {
 245         .enable_gpio            = GPIO_PIN_PA(28),
 246         .max_brightness         = 255,
 247         .dft_brightness         = 255,
 248         .lth_brightness         = 50,
 249 };
 250
 251 static struct platform_device pwm_bl_device = {
 252         .name = "pwm-backlight",
 253         .dev = {
 254                 .platform_data = &pwm_bl_data,
 255         },
 256 };
 257
 258 static void __init favr32_setup_atmel_pwm_bl(void)
 259 {
 260         pwm_add_table(pwm_lookup, ARRAY_SIZE(pwm_lookup));
 261         regulator_register_always_on(0, "fixed", fixed_power_consumers,
 262                                     ARRAY_SIZE(fixed_power_consumers), 3300000);
 263         platform_device_register(&pwm_bl_device);
 264         at32_select_gpio(pwm_bl_data.enable_gpio, 0);
 265 }
 266
 267 void __init setup_board(void)
 268 {
 269         at32_map_usart(3, 0, 0);        /* USART 3 => /dev/ttyS0 */
 270         at32_setup_serial_console(0);
 271 }
 272
 273 static int __init set_abdac_rate(struct platform_device *pdev)
 274 {
 275         int retval;
 276         struct clk *osc1;
 277         struct clk *pll1;
 278         struct clk *abdac;
 279
 280         if (pdev == NULL)
 281                 return -ENXIO;
 282
 283         osc1 = clk_get(NULL, "osc1");
 284         if (IS_ERR(osc1)) {
 285                 retval = PTR_ERR(osc1);
 286                 goto out;
 287         }
 288
 289         pll1 = clk_get(NULL, "pll1");
 290         if (IS_ERR(pll1)) {
 291                 retval = PTR_ERR(pll1);
 292                 goto out_osc1;
 293         }
 294
 295         abdac = clk_get(&pdev->dev, "sample_clk");
 296         if (IS_ERR(abdac)) {
 297                 retval = PTR_ERR(abdac);
 298                 goto out_pll1;
 299         }
 300
 301         retval = clk_set_parent(pll1, osc1);
 302         if (retval != 0)
 303                 goto out_abdac;
 304
 305         /*
 306          * Rate is 32000 to 50000 and ABDAC oversamples 256x. Multiply, in
 307          * power of 2, to a value above 80 MHz. Power of 2 so it is possible
 308          * for the generic clock to divide it down again and 80 MHz is the
 309          * lowest frequency for the PLL.
 310          */
 311         retval = clk_round_rate(pll1,
 312                         CONFIG_BOARD_FAVR32_ABDAC_RATE * 256 * 16);
 313         if (retval <= 0) {
 314                 retval = -EINVAL;
 315                 goto out_abdac;
 316         }
 317
 318         retval = clk_set_rate(pll1, retval);
 319         if (retval != 0)
 320                 goto out_abdac;
 321
 322         retval = clk_set_parent(abdac, pll1);
 323         if (retval != 0)
 324                 goto out_abdac;
 325
 326 out_abdac:
 327         clk_put(abdac);
 328 out_pll1:
 329         clk_put(pll1);
 330 out_osc1:
 331         clk_put(osc1);
 332 out:
 333         return retval;
 334 }
 335
 336 static int __init favr32_init(void)
 337 {
 338         /*
 339          * Favr-32 uses 32-bit SDRAM interface. Reserve the SDRAM-specific
 340          * pins so that nobody messes with them.
 341          */
 342         at32_reserve_pin(GPIO_PIOE_BASE, ATMEL_EBI_PE_DATA_ALL);
 343
 344         at32_select_gpio(GPIO_PIN_PB(3), 0);    /* IRQ from ADS7843 */
 345
 346         at32_add_device_usart(0);
 347
 348         set_hw_addr(at32_add_device_eth(0, &eth_data[0]));
 349
 350         spi1_board_info[0].irq = gpio_to_irq(GPIO_PIN_PB(3));
 351
 352         set_abdac_rate(at32_add_device_abdac(0, &abdac0_data));
 353
 354         at32_add_device_pwm(1 << PWM_BL_CH);
 355         at32_add_device_spi(1, spi1_board_info, ARRAY_SIZE(spi1_board_info));
 356         at32_add_device_mci(0, &mci0_data);
 357         at32_add_device_usba(0, NULL);
 358         at32_add_device_lcdc(0, &favr32_lcdc_data, fbmem_start, fbmem_size, 0);
 359
 360         favr32_setup_leds();
 361
 362         favr32_setup_atmel_pwm_bl();
 363
 364         return 0;
 365 }
 366 postcore_initcall(favr32_init);