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
  42 #include <mach/pxa25x.h>
  43 #include <mach/mmc.h>
  44 #include <mach/udc.h>
  45 #include <mach/gumstix.h>
  46
  47 #include "generic.h"
  48
  49 static struct resource flash_resource = {
  50         .start  = 0x00000000,
  51         .end    = SZ_64M - 1,
  52         .flags  = IORESOURCE_MEM,
  53 };
  54
  55 static struct mtd_partition gumstix_partitions[] = {
  56         {
  57                 .name =         "Bootloader",
  58                 .size =         0x00040000,
  59                 .offset =       0,
  60                 .mask_flags =   MTD_WRITEABLE  /* force read-only */
  61         } , {
  62                 .name =         "rootfs",
  63                 .size =         MTDPART_SIZ_FULL,
  64                 .offset =       MTDPART_OFS_APPEND
  65         }
  66 };
  67
  68 static struct flash_platform_data gumstix_flash_data = {
  69         .map_name       = "cfi_probe",
  70         .parts          = gumstix_partitions,
  71         .nr_parts       = ARRAY_SIZE(gumstix_partitions),
  72         .width          = 2,
  73 };
  74
  75 static struct platform_device gumstix_flash_device = {
  76         .name           = "pxa2xx-flash",
  77         .id             = 0,
  78         .dev = {
  79                 .platform_data = &gumstix_flash_data,
  80         },
  81         .resource = &flash_resource,
  82         .num_resources = 1,
  83 };
  84
  85 static struct platform_device *devices[] __initdata = {
  86         &gumstix_flash_device,
  87 };
  88
  89 #ifdef CONFIG_MMC_PXA
  90 static struct pxamci_platform_data gumstix_mci_platform_data = {
  91         .ocr_mask               = MMC_VDD_32_33|MMC_VDD_33_34,
  92         .gpio_card_detect       = -1,
  93         .gpio_card_ro           = -1,
  94         .gpio_power             = -1,
  95 };
  96
  97 static void __init gumstix_mmc_init(void)
  98 {
  99         pxa_set_mci_info(&gumstix_mci_platform_data);
 100 }
 101 #else
 102 static void __init gumstix_mmc_init(void)
 103 {
 104         pr_debug("Gumstix mmc disabled\n");
 105 }
 106 #endif
 107
 108 #ifdef CONFIG_USB_GADGET_PXA25X
 109 static struct pxa2xx_udc_mach_info gumstix_udc_info __initdata = {
 110         .gpio_vbus              = GPIO_GUMSTIX_USB_GPIOn,
 111         .gpio_pullup            = GPIO_GUMSTIX_USB_GPIOx,
 112 };
 113
 114 static void __init gumstix_udc_init(void)
 115 {
 116         pxa_set_udc_info(&gumstix_udc_info);
 117 }
 118 #else
 119 static void gumstix_udc_init(void)
 120 {
 121         pr_debug("Gumstix udc is disabled\n");
 122 }
 123 #endif
 124
 125 #ifdef CONFIG_BT
 126 /* Normally, the bootloader would have enabled this 32kHz clock but many
 127 ** boards still have u-boot 1.1.4 so we check if it has been turned on and
 128 ** if not, we turn it on with a warning message. */
 129 static void gumstix_setup_bt_clock(void)
 130 {
 131         int timeout = 500;
 132
 133         if (!(OSCC & OSCC_OOK))
 134                 pr_warning("32kHz clock was not on. Bootloader may need to "
 135                                 "be updated\n");
 136         else
 137                 return;
 138
 139         OSCC |= OSCC_OON;
 140         do {
 141                 if (OSCC & OSCC_OOK)
 142                         break;
 143                 udelay(1);
 144         } while (--timeout);
 145         if (!timeout)
 146                 pr_err("Failed to start 32kHz clock\n");
 147 }
 148
 149 static void __init gumstix_bluetooth_init(void)
 150 {
 151         int err;
 152
 153         gumstix_setup_bt_clock();
 154
 155         err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
 156         if (err) {
 157                 pr_err("gumstix: failed request gpio for bluetooth reset\n");
 158                 return;
 159         }
 160
 161         err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
 162         if (err) {
 163                 pr_err("gumstix: can't reset bluetooth\n");
 164                 return;
 165         }
 166         gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
 167         udelay(100);
 168         gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
 169 }
 170 #else
 171 static void gumstix_bluetooth_init(void)
 172 {
 173         pr_debug("Gumstix Bluetooth is disabled\n");
 174 }
 175 #endif
 176
 177 static unsigned long gumstix_pin_config[] __initdata = {
 178         GPIO12_32KHz,
 179         /* BTUART */
 180         GPIO42_HWUART_RXD,
 181         GPIO43_HWUART_TXD,
 182         GPIO44_HWUART_CTS,
 183         GPIO45_HWUART_RTS,
 184         /* MMC */
 185         GPIO6_MMC_CLK,
 186         GPIO53_MMC_CLK,
 187         GPIO8_MMC_CS0,
 188 };
 189
 190 int __attribute__((weak)) am200_init(void)
 191 {
 192         return 0;
 193 }
 194
 195 int __attribute__((weak)) am300_init(void)
 196 {
 197         return 0;
 198 }
 199
 200 static void __init carrier_board_init(void)
 201 {
 202         /*
 203          * put carrier/expansion board init here if
 204          * they cannot be detected programatically
 205          */
 206         am200_init();
 207         am300_init();
 208 }
 209
 210 static void __init gumstix_init(void)
 211 {
 212         pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
 213
 214         gumstix_bluetooth_init();
 215         gumstix_udc_init();
 216         gumstix_mmc_init();
 217         (void) platform_add_devices(devices, ARRAY_SIZE(devices));
 218         carrier_board_init();
 219 }
 220
 221 MACHINE_START(GUMSTIX, "Gumstix")
 222         .phys_io        = 0x40000000,
 223         .boot_params    = 0xa0000100, /* match u-boot bi_boot_params */
 224         .io_pg_offst    = (io_p2v(0x40000000) >> 18) & 0xfffc,
 225         .map_io         = pxa_map_io,
 226         .init_irq       = pxa25x_init_irq,
 227         .timer          = &pxa_timer,
 228         .init_machine   = gumstix_init,
 229 MACHINE_END