arch/arm/mach-pxa/gumstix.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/arch/arm/mach-pxa/gumstix.c
   4  *
   5  *  Support for the Gumstix motherboards.
   6  *
   7  *  Original Author:    Craig Hughes
   8  *  Created:    Feb 14, 2008
   9  *  Copyright:  Craig Hughes
  10  *
  11  *  Implemented based on lubbock.c by Nicolas Pitre and code from Craig
  12  *  Hughes
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/delay.h>
  21 #include <linux/mtd/mtd.h>
  22 #include <linux/mtd/partitions.h>
  23 #include <linux/gpio.h>
  24 #include <linux/err.h>
  25 #include <linux/clk.h>
  26 #include <linux/usb/gpio_vbus.h>
  27
  28 #include <asm/setup.h>
  29 #include <asm/memory.h>
  30 #include <asm/mach-types.h>
  31 #include <mach/hardware.h>
  32 #include <asm/irq.h>
  33 #include <linux/sizes.h>
  34
  35 #include <asm/mach/arch.h>
  36 #include <asm/mach/map.h>
  37 #include <asm/mach/irq.h>
  38 #include <asm/mach/flash.h>
  39
  40 #include "pxa25x.h"
  41 #include <linux/platform_data/mmc-pxamci.h>
  42 #include "udc.h"
  43 #include "gumstix.h"
  44
  45 #include "generic.h"
  46
  47 static struct resource flash_resource = {
  48         .start  = 0x00000000,
  49         .end    = SZ_64M - 1,
  50         .flags  = IORESOURCE_MEM,
  51 };
  52
  53 static struct mtd_partition gumstix_partitions[] = {
  54         {
  55                 .name =         "Bootloader",
  56                 .size =         0x00040000,
  57                 .offset =       0,
  58                 .mask_flags =   MTD_WRITEABLE  /* force read-only */
  59         } , {
  60                 .name =         "rootfs",
  61                 .size =         MTDPART_SIZ_FULL,
  62                 .offset =       MTDPART_OFS_APPEND
  63         }
  64 };
  65
  66 static struct flash_platform_data gumstix_flash_data = {
  67         .map_name       = "cfi_probe",
  68         .parts          = gumstix_partitions,
  69         .nr_parts       = ARRAY_SIZE(gumstix_partitions),
  70         .width          = 2,
  71 };
  72
  73 static struct platform_device gumstix_flash_device = {
  74         .name           = "pxa2xx-flash",
  75         .id             = 0,
  76         .dev = {
  77                 .platform_data = &gumstix_flash_data,
  78         },
  79         .resource = &flash_resource,
  80         .num_resources = 1,
  81 };
  82
  83 static struct platform_device *devices[] __initdata = {
  84         &gumstix_flash_device,
  85 };
  86
  87 #ifdef CONFIG_MMC_PXA
  88 static struct pxamci_platform_data gumstix_mci_platform_data = {
  89         .ocr_mask               = MMC_VDD_32_33|MMC_VDD_33_34,
  90 };
  91
  92 static void __init gumstix_mmc_init(void)
  93 {
  94         pxa_set_mci_info(&gumstix_mci_platform_data);
  95 }
  96 #else
  97 static void __init gumstix_mmc_init(void)
  98 {
  99         pr_debug("Gumstix mmc disabled\n");
 100 }
 101 #endif
 102
 103 #ifdef CONFIG_USB_PXA25X
 104 static struct gpio_vbus_mach_info gumstix_udc_info = {
 105         .gpio_vbus              = GPIO_GUMSTIX_USB_GPIOn,
 106         .gpio_pullup            = GPIO_GUMSTIX_USB_GPIOx,
 107 };
 108
 109 static struct platform_device gumstix_gpio_vbus = {
 110         .name   = "gpio-vbus",
 111         .id     = -1,
 112         .dev    = {
 113                 .platform_data  = &gumstix_udc_info,
 114         },
 115 };
 116
 117 static void __init gumstix_udc_init(void)
 118 {
 119         platform_device_register(&gumstix_gpio_vbus);
 120 }
 121 #else
 122 static void gumstix_udc_init(void)
 123 {
 124         pr_debug("Gumstix udc is disabled\n");
 125 }
 126 #endif
 127
 128 #ifdef CONFIG_BT
 129 /* Normally, the bootloader would have enabled this 32kHz clock but many
 130 ** boards still have u-boot 1.1.4 so we check if it has been turned on and
 131 ** if not, we turn it on with a warning message. */
 132 static void gumstix_setup_bt_clock(void)
 133 {
 134         int timeout = 500;
 135
 136         if (!(readl(OSCC) & OSCC_OOK))
 137                 pr_warn("32kHz clock was not on. Bootloader may need to be updated\n");
 138         else
 139                 return;
 140
 141         writel(readl(OSCC) | OSCC_OON, OSCC);
 142         do {
 143                 if (readl(OSCC) & OSCC_OOK)
 144                         break;
 145                 udelay(1);
 146         } while (--timeout);
 147         if (!timeout)
 148                 pr_err("Failed to start 32kHz clock\n");
 149 }
 150
 151 static void __init gumstix_bluetooth_init(void)
 152 {
 153         int err;
 154
 155         gumstix_setup_bt_clock();
 156
 157         err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
 158         if (err) {
 159                 pr_err("gumstix: failed request gpio for bluetooth reset\n");
 160                 return;
 161         }
 162
 163         err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
 164         if (err) {
 165                 pr_err("gumstix: can't reset bluetooth\n");
 166                 return;
 167         }
 168         gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
 169         udelay(100);
 170         gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
 171 }
 172 #else
 173 static void gumstix_bluetooth_init(void)
 174 {
 175         pr_debug("Gumstix Bluetooth is disabled\n");
 176 }
 177 #endif
 178
 179 static unsigned long gumstix_pin_config[] __initdata = {
 180         GPIO12_32KHz,
 181         /* BTUART */
 182         GPIO42_HWUART_RXD,
 183         GPIO43_HWUART_TXD,
 184         GPIO44_HWUART_CTS,
 185         GPIO45_HWUART_RTS,
 186         /* MMC */
 187         GPIO6_MMC_CLK,
 188         GPIO53_MMC_CLK,
 189         GPIO8_MMC_CS0,
 190 };
 191
 192 int __attribute__((weak)) am200_init(void)
 193 {
 194         return 0;
 195 }
 196
 197 int __attribute__((weak)) am300_init(void)
 198 {
 199         return 0;
 200 }
 201
 202 static void __init carrier_board_init(void)
 203 {
 204         /*
 205          * put carrier/expansion board init here if
 206          * they cannot be detected programatically
 207          */
 208         am200_init();
 209         am300_init();
 210 }
 211
 212 static void __init gumstix_init(void)
 213 {
 214         pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
 215
 216         pxa_set_ffuart_info(NULL);
 217         pxa_set_btuart_info(NULL);
 218         pxa_set_stuart_info(NULL);
 219         pxa_set_hwuart_info(NULL);
 220
 221         gumstix_bluetooth_init();
 222         gumstix_udc_init();
 223         gumstix_mmc_init();
 224         (void) platform_add_devices(devices, ARRAY_SIZE(devices));
 225         carrier_board_init();
 226 }
 227
 228 MACHINE_START(GUMSTIX, "Gumstix")
 229         .atag_offset    = 0x100, /* match u-boot bi_boot_params */
 230         .map_io         = pxa25x_map_io,
 231         .nr_irqs        = PXA_NR_IRQS,
 232         .init_irq       = pxa25x_init_irq,
 233         .handle_irq     = pxa25x_handle_irq,
 234         .init_time      = pxa_timer_init,
 235         .init_machine   = gumstix_init,
 236         .restart        = pxa_restart,
 237 MACHINE_END