kernel/2.6.29.6-aldebaran-rt/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
  30 #include <asm/setup.h>
  31 #include <asm/memory.h>
  32 #include <asm/mach-types.h>
  33 #include <mach/hardware.h>
  34 #include <asm/irq.h>
  35 #include <asm/sizes.h>
  36
  37 #include <asm/mach/arch.h>
  38 #include <asm/mach/map.h>
  39 #include <asm/mach/irq.h>
  40 #include <asm/mach/flash.h>
  41 #include <mach/mmc.h>
  42 #include <mach/udc.h>
  43 #include <mach/gumstix.h>
  44
  45 #include <mach/pxa-regs.h>
  46 #include <mach/pxa2xx-regs.h>
  47 #include <mach/mfp-pxa25x.h>
  48
  49 #include "generic.h"
  50
  51 static struct resource flash_resource = {
  52         .start  = 0x00000000,
  53         .end    = SZ_64M - 1,
  54         .flags  = IORESOURCE_MEM,
  55 };
  56
  57 static struct mtd_partition gumstix_partitions[] = {
  58         {
  59                 .name =         "Bootloader",
  60                 .size =         0x00040000,
  61                 .offset =       0,
  62                 .mask_flags =   MTD_WRITEABLE  /* force read-only */
  63         } , {
  64                 .name =         "rootfs",
  65                 .size =         MTDPART_SIZ_FULL,
  66                 .offset =       MTDPART_OFS_APPEND
  67         }
  68 };
  69
  70 static struct flash_platform_data gumstix_flash_data = {
  71         .map_name       = "cfi_probe",
  72         .parts          = gumstix_partitions,
  73         .nr_parts       = ARRAY_SIZE(gumstix_partitions),
  74         .width          = 2,
  75 };
  76
  77 static struct platform_device gumstix_flash_device = {
  78         .name           = "pxa2xx-flash",
  79         .id             = 0,
  80         .dev = {
  81                 .platform_data = &gumstix_flash_data,
  82         },
  83         .resource = &flash_resource,
  84         .num_resources = 1,
  85 };
  86
  87 static struct platform_device *devices[] __initdata = {
  88         &gumstix_flash_device,
  89 };
  90
  91 #ifdef CONFIG_MMC_PXA
  92 static struct pxamci_platform_data gumstix_mci_platform_data = {
  93         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
  94 };
  95
  96 static void __init gumstix_mmc_init(void)
  97 {
  98         pxa_set_mci_info(&gumstix_mci_platform_data);
  99 }
 100 #else
 101 static void __init gumstix_mmc_init(void)
 102 {
 103         pr_debug("Gumstix mmc disabled\n");
 104 }
 105 #endif
 106
 107 #ifdef CONFIG_USB_GADGET_PXA25X
 108 static struct pxa2xx_udc_mach_info gumstix_udc_info __initdata = {
 109         .gpio_vbus              = GPIO_GUMSTIX_USB_GPIOn,
 110         .gpio_pullup            = GPIO_GUMSTIX_USB_GPIOx,
 111 };
 112
 113 static void __init gumstix_udc_init(void)
 114 {
 115         pxa_set_udc_info(&gumstix_udc_info);
 116 }
 117 #else
 118 static void gumstix_udc_init(void)
 119 {
 120         pr_debug("Gumstix udc is disabled\n");
 121 }
 122 #endif
 123
 124 #ifdef CONFIG_BT
 125 /* Normally, the bootloader would have enabled this 32kHz clock but many
 126 ** boards still have u-boot 1.1.4 so we check if it has been turned on and
 127 ** if not, we turn it on with a warning message. */
 128 static void gumstix_setup_bt_clock(void)
 129 {
 130         int timeout = 500;
 131
 132         if (!(OSCC & OSCC_OOK))
 133                 pr_warning("32kHz clock was not on. Bootloader may need to "
 134                                 "be updated\n");
 135         else
 136                 return;
 137
 138         OSCC |= OSCC_OON;
 139         do {
 140                 if (OSCC & OSCC_OOK)
 141                         break;
 142                 udelay(1);
 143         } while (--timeout);
 144         if (!timeout)
 145                 pr_err("Failed to start 32kHz clock\n");
 146 }
 147
 148 static void __init gumstix_bluetooth_init(void)
 149 {
 150         int err;
 151
 152         gumstix_setup_bt_clock();
 153
 154         err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
 155         if (err) {
 156                 pr_err("gumstix: failed request gpio for bluetooth reset\n");
 157                 return;
 158         }
 159
 160         err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
 161         if (err) {
 162                 pr_err("gumstix: can't reset bluetooth\n");
 163                 return;
 164         }
 165         gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
 166         udelay(100);
 167         gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
 168 }
 169 #else
 170 static void gumstix_bluetooth_init(void)
 171 {
 172         pr_debug("Gumstix Bluetooth is disabled\n");
 173 }
 174 #endif
 175
 176 static unsigned long gumstix_pin_config[] __initdata = {
 177         GPIO12_32KHz,
 178         /* BTUART */
 179         GPIO42_HWUART_RXD,
 180         GPIO43_HWUART_TXD,
 181         GPIO44_HWUART_CTS,
 182         GPIO45_HWUART_RTS,
 183         /* MMC */
 184         GPIO6_MMC_CLK,
 185         GPIO53_MMC_CLK,
 186         GPIO8_MMC_CS0,
 187 };
 188
 189 int __attribute__((weak)) am200_init(void)
 190 {
 191         return 0;
 192 }
 193
 194 static void __init carrier_board_init(void)
 195 {
 196         /*
 197          * put carrier/expansion board init here if
 198          * they cannot be detected programatically
 199          */
 200         am200_init();
 201 }
 202
 203 static void __init gumstix_init(void)
 204 {
 205         pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
 206
 207         gumstix_bluetooth_init();
 208         gumstix_udc_init();
 209         gumstix_mmc_init();
 210         (void) platform_add_devices(devices, ARRAY_SIZE(devices));
 211         carrier_board_init();
 212 }
 213
 214 MACHINE_START(GUMSTIX, "Gumstix")
 215         .phys_io        = 0x40000000,
 216         .boot_params    = 0xa0000100, /* match u-boot bi_boot_params */
 217         .io_pg_offst    = (io_p2v(0x40000000) >> 18) & 0xfffc,
 218         .map_io         = pxa_map_io,
 219         .init_irq       = pxa25x_init_irq,
 220         .timer          = &pxa_timer,
 221         .init_machine   = gumstix_init,
 222 MACHINE_END