arch/arm/mach-pxa/gumstix.c

   1 /*
   2  *  linux/arch/arm/mach-pxa/gumstix.c
   3  *
   4  *  Support for the Gumstix motherboards.
   5  *
   6  *  Original Author:    Craig Hughes
   7  *  Created:    Feb 14, 2008
   8  *  Copyright:  Craig Hughes
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2 as
  12  *  published by the Free Software Foundation.
  13  *
  14  *  Implemented based on lubbock.c by Nicolas Pitre and code from Craig
  15  *  Hughes
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/delay.h>
  24 #include <linux/mtd/mtd.h>
  25 #include <linux/mtd/partitions.h>
  26 #include <linux/gpio.h>
  27 #include <linux/err.h>
  28 #include <linux/clk.h>
  29 #include <linux/usb/gpio_vbus.h>
  30
  31 #include <asm/setup.h>
  32 #include <asm/memory.h>
  33 #include <asm/mach-types.h>
  34 #include <mach/hardware.h>
  35 #include <asm/irq.h>
  36 #include <asm/sizes.h>
  37
  38 #include <asm/mach/arch.h>
  39 #include <asm/mach/map.h>
  40 #include <asm/mach/irq.h>
  41 #include <asm/mach/flash.h>
  42
  43 #include <mach/pxa25x.h>
  44 #include <linux/platform_data/mmc-pxamci.h>
  45 #include <mach/udc.h>
  46 #include <mach/gumstix.h>
  47
  48 #include "generic.h"
  49
  50 static struct resource flash_resource = {
  51         .start  = 0x00000000,
  52         .end    = SZ_64M - 1,
  53         .flags  = IORESOURCE_MEM,
  54 };
  55
  56 static struct mtd_partition gumstix_partitions[] = {
  57         {
  58                 .name =         "Bootloader",
  59                 .size =         0x00040000,
  60                 .offset =       0,
  61                 .mask_flags =   MTD_WRITEABLE  /* force read-only */
  62         } , {
  63                 .name =         "rootfs",
  64                 .size =         MTDPART_SIZ_FULL,
  65                 .offset =       MTDPART_OFS_APPEND
  66         }
  67 };
  68
  69 static struct flash_platform_data gumstix_flash_data = {
  70         .map_name       = "cfi_probe",
  71         .parts          = gumstix_partitions,
  72         .nr_parts       = ARRAY_SIZE(gumstix_partitions),
  73         .width          = 2,
  74 };
  75
  76 static struct platform_device gumstix_flash_device = {
  77         .name           = "pxa2xx-flash",
  78         .id             = 0,
  79         .dev = {
  80                 .platform_data = &gumstix_flash_data,
  81         },
  82         .resource = &flash_resource,
  83         .num_resources = 1,
  84 };
  85
  86 static struct platform_device *devices[] __initdata = {
  87         &gumstix_flash_device,
  88 };
  89
  90 #ifdef CONFIG_MMC_PXA
  91 static struct pxamci_platform_data gumstix_mci_platform_data = {
  92         .ocr_mask               = MMC_VDD_32_33|MMC_VDD_33_34,
  93         .gpio_card_detect       = -1,
  94         .gpio_card_ro           = -1,
  95         .gpio_power             = -1,
  96 };
  97
  98 static void __init gumstix_mmc_init(void)
  99 {
 100         pxa_set_mci_info(&gumstix_mci_platform_data);
 101 }
 102 #else
 103 static void __init gumstix_mmc_init(void)
 104 {
 105         pr_debug("Gumstix mmc disabled\n");
 106 }
 107 #endif
 108
 109 #ifdef CONFIG_USB_PXA25X
 110 static struct gpio_vbus_mach_info gumstix_udc_info = {
 111         .gpio_vbus              = GPIO_GUMSTIX_USB_GPIOn,
 112         .gpio_pullup            = GPIO_GUMSTIX_USB_GPIOx,
 113 };
 114
 115 static struct platform_device gumstix_gpio_vbus = {
 116         .name   = "gpio-vbus",
 117         .id     = -1,
 118         .dev    = {
 119                 .platform_data  = &gumstix_udc_info,
 120         },
 121 };
 122
 123 static void __init gumstix_udc_init(void)
 124 {
 125         platform_device_register(&gumstix_gpio_vbus);
 126 }
 127 #else
 128 static void gumstix_udc_init(void)
 129 {
 130         pr_debug("Gumstix udc is disabled\n");
 131 }
 132 #endif
 133
 134 #ifdef CONFIG_BT
 135 /* Normally, the bootloader would have enabled this 32kHz clock but many
 136 ** boards still have u-boot 1.1.4 so we check if it has been turned on and
 137 ** if not, we turn it on with a warning message. */
 138 static void gumstix_setup_bt_clock(void)
 139 {
 140         int timeout = 500;
 141
 142         if (!(OSCC & OSCC_OOK))
 143                 pr_warn("32kHz clock was not on. Bootloader may need to be updated\n");
 144         else
 145                 return;
 146
 147         OSCC |= OSCC_OON;
 148         do {
 149                 if (OSCC & OSCC_OOK)
 150                         break;
 151                 udelay(1);
 152         } while (--timeout);
 153         if (!timeout)
 154                 pr_err("Failed to start 32kHz clock\n");
 155 }
 156
 157 static void __init gumstix_bluetooth_init(void)
 158 {
 159         int err;
 160
 161         gumstix_setup_bt_clock();
 162
 163         err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
 164         if (err) {
 165                 pr_err("gumstix: failed request gpio for bluetooth reset\n");
 166                 return;
 167         }
 168
 169         err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
 170         if (err) {
 171                 pr_err("gumstix: can't reset bluetooth\n");
 172                 return;
 173         }
 174         gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
 175         udelay(100);
 176         gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
 177 }
 178 #else
 179 static void gumstix_bluetooth_init(void)
 180 {
 181         pr_debug("Gumstix Bluetooth is disabled\n");
 182 }
 183 #endif
 184
 185 static unsigned long gumstix_pin_config[] __initdata = {
 186         GPIO12_32KHz,
 187         /* BTUART */
 188         GPIO42_HWUART_RXD,
 189         GPIO43_HWUART_TXD,
 190         GPIO44_HWUART_CTS,
 191         GPIO45_HWUART_RTS,
 192         /* MMC */
 193         GPIO6_MMC_CLK,
 194         GPIO53_MMC_CLK,
 195         GPIO8_MMC_CS0,
 196 };
 197
 198 int __attribute__((weak)) am200_init(void)
 199 {
 200         return 0;
 201 }
 202
 203 int __attribute__((weak)) am300_init(void)
 204 {
 205         return 0;
 206 }
 207
 208 static void __init carrier_board_init(void)
 209 {
 210         /*
 211          * put carrier/expansion board init here if
 212          * they cannot be detected programatically
 213          */
 214         am200_init();
 215         am300_init();
 216 }
 217
 218 static void __init gumstix_init(void)
 219 {
 220         pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
 221
 222         pxa_set_ffuart_info(NULL);
 223         pxa_set_btuart_info(NULL);
 224         pxa_set_stuart_info(NULL);
 225         pxa_set_hwuart_info(NULL);
 226
 227         gumstix_bluetooth_init();
 228         gumstix_udc_init();
 229         gumstix_mmc_init();
 230         (void) platform_add_devices(devices, ARRAY_SIZE(devices));
 231         carrier_board_init();
 232 }
 233
 234 MACHINE_START(GUMSTIX, "Gumstix")
 235         .atag_offset    = 0x100, /* match u-boot bi_boot_params */
 236         .map_io         = pxa25x_map_io,
 237         .nr_irqs        = PXA_NR_IRQS,
 238         .init_irq       = pxa25x_init_irq,
 239         .handle_irq     = pxa25x_handle_irq,
 240         .init_time      = pxa_timer_init,
 241         .init_machine   = gumstix_init,
 242         .restart        = pxa_restart,
 243 MACHINE_END