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 };
  93
  94 static void __init gumstix_mmc_init(void)
  95 {
  96         pxa_set_mci_info(&gumstix_mci_platform_data);
  97 }
  98 #else
  99 static void __init gumstix_mmc_init(void)
 100 {
 101         pr_debug("Gumstix mmc disabled\n");
 102 }
 103 #endif
 104
 105 #ifdef CONFIG_USB_GADGET_PXA25X
 106 static struct pxa2xx_udc_mach_info gumstix_udc_info __initdata = {
 107         .gpio_vbus              = GPIO_GUMSTIX_USB_GPIOn,
 108         .gpio_pullup            = GPIO_GUMSTIX_USB_GPIOx,
 109 };
 110
 111 static void __init gumstix_udc_init(void)
 112 {
 113         pxa_set_udc_info(&gumstix_udc_info);
 114 }
 115 #else
 116 static void gumstix_udc_init(void)
 117 {
 118         pr_debug("Gumstix udc is disabled\n");
 119 }
 120 #endif
 121
 122 #ifdef CONFIG_BT
 123 /* Normally, the bootloader would have enabled this 32kHz clock but many
 124 ** boards still have u-boot 1.1.4 so we check if it has been turned on and
 125 ** if not, we turn it on with a warning message. */
 126 static void gumstix_setup_bt_clock(void)
 127 {
 128         int timeout = 500;
 129
 130         if (!(OSCC & OSCC_OOK))
 131                 pr_warning("32kHz clock was not on. Bootloader may need to "
 132                                 "be updated\n");
 133         else
 134                 return;
 135
 136         OSCC |= OSCC_OON;
 137         do {
 138                 if (OSCC & OSCC_OOK)
 139                         break;
 140                 udelay(1);
 141         } while (--timeout);
 142         if (!timeout)
 143                 pr_err("Failed to start 32kHz clock\n");
 144 }
 145
 146 static void __init gumstix_bluetooth_init(void)
 147 {
 148         int err;
 149
 150         gumstix_setup_bt_clock();
 151
 152         err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
 153         if (err) {
 154                 pr_err("gumstix: failed request gpio for bluetooth reset\n");
 155                 return;
 156         }
 157
 158         err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
 159         if (err) {
 160                 pr_err("gumstix: can't reset bluetooth\n");
 161                 return;
 162         }
 163         gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
 164         udelay(100);
 165         gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
 166 }
 167 #else
 168 static void gumstix_bluetooth_init(void)
 169 {
 170         pr_debug("Gumstix Bluetooth is disabled\n");
 171 }
 172 #endif
 173
 174 static unsigned long gumstix_pin_config[] __initdata = {
 175         GPIO12_32KHz,
 176         /* BTUART */
 177         GPIO42_HWUART_RXD,
 178         GPIO43_HWUART_TXD,
 179         GPIO44_HWUART_CTS,
 180         GPIO45_HWUART_RTS,
 181         /* MMC */
 182         GPIO6_MMC_CLK,
 183         GPIO53_MMC_CLK,
 184         GPIO8_MMC_CS0,
 185 };
 186
 187 int __attribute__((weak)) am200_init(void)
 188 {
 189         return 0;
 190 }
 191
 192 int __attribute__((weak)) am300_init(void)
 193 {
 194         return 0;
 195 }
 196
 197 static void __init carrier_board_init(void)
 198 {
 199         /*
 200          * put carrier/expansion board init here if
 201          * they cannot be detected programatically
 202          */
 203         am200_init();
 204         am300_init();
 205 }
 206
 207 static void __init gumstix_init(void)
 208 {
 209         pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
 210
 211         gumstix_bluetooth_init();
 212         gumstix_udc_init();
 213         gumstix_mmc_init();
 214         (void) platform_add_devices(devices, ARRAY_SIZE(devices));
 215         carrier_board_init();
 216 }
 217
 218 MACHINE_START(GUMSTIX, "Gumstix")
 219         .phys_io        = 0x40000000,
 220         .boot_params    = 0xa0000100, /* match u-boot bi_boot_params */
 221         .io_pg_offst    = (io_p2v(0x40000000) >> 18) & 0xfffc,
 222         .map_io         = pxa_map_io,
 223         .init_irq       = pxa25x_init_irq,
 224         .timer          = &pxa_timer,
 225         .init_machine   = gumstix_init,
 226 MACHINE_END