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/machine.h>
  24 #include <linux/gpio/property.h>
  25 #include <linux/gpio.h>
  26 #include <linux/err.h>
  27 #include <linux/clk.h>
  28
  29 #include <asm/setup.h>
  30 #include <asm/page.h>
  31 #include <asm/mach-types.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 #include "devices.h"
  45
  46 #include "generic.h"
  47
  48 static struct resource flash_resource = {
  49         .start  = 0x00000000,
  50         .end    = SZ_64M - 1,
  51         .flags  = IORESOURCE_MEM,
  52 };
  53
  54 static struct mtd_partition gumstix_partitions[] = {
  55         {
  56                 .name =         "Bootloader",
  57                 .size =         0x00040000,
  58                 .offset =       0,
  59                 .mask_flags =   MTD_WRITEABLE  /* force read-only */
  60         } , {
  61                 .name =         "rootfs",
  62                 .size =         MTDPART_SIZ_FULL,
  63                 .offset =       MTDPART_OFS_APPEND
  64         }
  65 };
  66
  67 static struct flash_platform_data gumstix_flash_data = {
  68         .map_name       = "cfi_probe",
  69         .parts          = gumstix_partitions,
  70         .nr_parts       = ARRAY_SIZE(gumstix_partitions),
  71         .width          = 2,
  72 };
  73
  74 static struct platform_device gumstix_flash_device = {
  75         .name           = "pxa2xx-flash",
  76         .id             = 0,
  77         .dev = {
  78                 .platform_data = &gumstix_flash_data,
  79         },
  80         .resource = &flash_resource,
  81         .num_resources = 1,
  82 };
  83
  84 static struct platform_device *devices[] __initdata = {
  85         &gumstix_flash_device,
  86 };
  87
  88 #ifdef CONFIG_MMC_PXA
  89 static struct pxamci_platform_data gumstix_mci_platform_data = {
  90         .ocr_mask               = MMC_VDD_32_33|MMC_VDD_33_34,
  91 };
  92
  93 static void __init gumstix_mmc_init(void)
  94 {
  95         pxa_set_mci_info(&gumstix_mci_platform_data, NULL);
  96 }
  97 #else
  98 static void __init gumstix_mmc_init(void)
  99 {
 100         pr_debug("Gumstix mmc disabled\n");
 101 }
 102 #endif
 103
 104 #if IS_ENABLED(CONFIG_USB_PXA25X)
 105 static const struct property_entry gumstix_vbus_props[] __initconst = {
 106         PROPERTY_ENTRY_GPIO("vbus-gpios", &pxa2xx_gpiochip_node,
 107                             GPIO_GUMSTIX_USB_GPIOn, GPIO_ACTIVE_HIGH),
 108         PROPERTY_ENTRY_GPIO("pullup-gpios", &pxa2xx_gpiochip_node,
 109                             GPIO_GUMSTIX_USB_GPIOx, GPIO_ACTIVE_HIGH),
 110         { }
 111 };
 112
 113 static const struct platform_device_info gumstix_gpio_vbus_info __initconst = {
 114         .name           = "gpio-vbus",
 115         .id             = PLATFORM_DEVID_NONE,
 116         .properties     = gumstix_vbus_props,
 117 };
 118
 119 static void __init gumstix_udc_init(void)
 120 {
 121         platform_device_register_full(&gumstix_gpio_vbus_info);
 122 }
 123 #else
 124 static void gumstix_udc_init(void)
 125 {
 126         pr_debug("Gumstix udc is disabled\n");
 127 }
 128 #endif
 129
 130 #ifdef CONFIG_BT
 131 /* Normally, the bootloader would have enabled this 32kHz clock but many
 132 ** boards still have u-boot 1.1.4 so we check if it has been turned on and
 133 ** if not, we turn it on with a warning message. */
 134 static void gumstix_setup_bt_clock(void)
 135 {
 136         int timeout = 500;
 137
 138         if (!(readl(OSCC) & OSCC_OOK))
 139                 pr_warn("32kHz clock was not on. Bootloader may need to be updated\n");
 140         else
 141                 return;
 142
 143         writel(readl(OSCC) | OSCC_OON, OSCC);
 144         do {
 145                 if (readl(OSCC) & OSCC_OOK)
 146                         break;
 147                 udelay(1);
 148         } while (--timeout);
 149         if (!timeout)
 150                 pr_err("Failed to start 32kHz clock\n");
 151 }
 152
 153 static void __init gumstix_bluetooth_init(void)
 154 {
 155         int err;
 156
 157         gumstix_setup_bt_clock();
 158
 159         err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
 160         if (err) {
 161                 pr_err("gumstix: failed request gpio for bluetooth reset\n");
 162                 return;
 163         }
 164
 165         err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
 166         if (err) {
 167                 pr_err("gumstix: can't reset bluetooth\n");
 168                 return;
 169         }
 170         gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
 171         udelay(100);
 172         gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
 173 }
 174 #else
 175 static void gumstix_bluetooth_init(void)
 176 {
 177         pr_debug("Gumstix Bluetooth is disabled\n");
 178 }
 179 #endif
 180
 181 static unsigned long gumstix_pin_config[] __initdata = {
 182         GPIO12_32KHz,
 183         /* BTUART */
 184         GPIO42_HWUART_RXD,
 185         GPIO43_HWUART_TXD,
 186         GPIO44_HWUART_CTS,
 187         GPIO45_HWUART_RTS,
 188         /* MMC */
 189         GPIO6_MMC_CLK,
 190         GPIO53_MMC_CLK,
 191         GPIO8_MMC_CS0,
 192 };
 193
 194 int __attribute__((weak)) am200_init(void)
 195 {
 196         return 0;
 197 }
 198
 199 int __attribute__((weak)) am300_init(void)
 200 {
 201         return 0;
 202 }
 203
 204 static void __init carrier_board_init(void)
 205 {
 206         /*
 207          * put carrier/expansion board init here if
 208          * they cannot be detected programatically
 209          */
 210         am200_init();
 211         am300_init();
 212 }
 213
 214 static void __init gumstix_init(void)
 215 {
 216         pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
 217
 218         pxa_set_ffuart_info(NULL);
 219         pxa_set_btuart_info(NULL);
 220         pxa_set_stuart_info(NULL);
 221         pxa_set_hwuart_info(NULL);
 222
 223         gumstix_bluetooth_init();
 224         gumstix_udc_init();
 225         gumstix_mmc_init();
 226         (void) platform_add_devices(devices, ARRAY_SIZE(devices));
 227         carrier_board_init();
 228 }
 229
 230 MACHINE_START(GUMSTIX, "Gumstix")
 231         .atag_offset    = 0x100, /* match u-boot bi_boot_params */
 232         .map_io         = pxa25x_map_io,
 233         .nr_irqs        = PXA_NR_IRQS,
 234         .init_irq       = pxa25x_init_irq,
 235         .init_time      = pxa_timer_init,
 236         .init_machine   = gumstix_init,
 237         .restart        = pxa_restart,
 238 MACHINE_END