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.h>
  25 #include <linux/err.h>
  26 #include <linux/clk.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 gpiod_lookup_table gumstix_gpio_vbus_gpiod_table = {
 105         .dev_id = "gpio-vbus",
 106         .table = {
 107                 GPIO_LOOKUP("gpio-pxa", GPIO_GUMSTIX_USB_GPIOn,
 108                             "vbus", GPIO_ACTIVE_HIGH),
 109                 GPIO_LOOKUP("gpio-pxa", GPIO_GUMSTIX_USB_GPIOx,
 110                             "pullup", GPIO_ACTIVE_HIGH),
 111                 { },
 112         },
 113 };
 114
 115 static struct platform_device gumstix_gpio_vbus = {
 116         .name   = "gpio-vbus",
 117         .id     = -1,
 118 };
 119
 120 static void __init gumstix_udc_init(void)
 121 {
 122         gpiod_add_lookup_table(&gumstix_gpio_vbus_gpiod_table);
 123         platform_device_register(&gumstix_gpio_vbus);
 124 }
 125 #else
 126 static void gumstix_udc_init(void)
 127 {
 128         pr_debug("Gumstix udc is disabled\n");
 129 }
 130 #endif
 131
 132 #ifdef CONFIG_BT
 133 /* Normally, the bootloader would have enabled this 32kHz clock but many
 134 ** boards still have u-boot 1.1.4 so we check if it has been turned on and
 135 ** if not, we turn it on with a warning message. */
 136 static void gumstix_setup_bt_clock(void)
 137 {
 138         int timeout = 500;
 139
 140         if (!(readl(OSCC) & OSCC_OOK))
 141                 pr_warn("32kHz clock was not on. Bootloader may need to be updated\n");
 142         else
 143                 return;
 144
 145         writel(readl(OSCC) | OSCC_OON, OSCC);
 146         do {
 147                 if (readl(OSCC) & OSCC_OOK)
 148                         break;
 149                 udelay(1);
 150         } while (--timeout);
 151         if (!timeout)
 152                 pr_err("Failed to start 32kHz clock\n");
 153 }
 154
 155 static void __init gumstix_bluetooth_init(void)
 156 {
 157         int err;
 158
 159         gumstix_setup_bt_clock();
 160
 161         err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
 162         if (err) {
 163                 pr_err("gumstix: failed request gpio for bluetooth reset\n");
 164                 return;
 165         }
 166
 167         err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
 168         if (err) {
 169                 pr_err("gumstix: can't reset bluetooth\n");
 170                 return;
 171         }
 172         gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
 173         udelay(100);
 174         gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
 175 }
 176 #else
 177 static void gumstix_bluetooth_init(void)
 178 {
 179         pr_debug("Gumstix Bluetooth is disabled\n");
 180 }
 181 #endif
 182
 183 static unsigned long gumstix_pin_config[] __initdata = {
 184         GPIO12_32KHz,
 185         /* BTUART */
 186         GPIO42_HWUART_RXD,
 187         GPIO43_HWUART_TXD,
 188         GPIO44_HWUART_CTS,
 189         GPIO45_HWUART_RTS,
 190         /* MMC */
 191         GPIO6_MMC_CLK,
 192         GPIO53_MMC_CLK,
 193         GPIO8_MMC_CS0,
 194 };
 195
 196 int __attribute__((weak)) am200_init(void)
 197 {
 198         return 0;
 199 }
 200
 201 int __attribute__((weak)) am300_init(void)
 202 {
 203         return 0;
 204 }
 205
 206 static void __init carrier_board_init(void)
 207 {
 208         /*
 209          * put carrier/expansion board init here if
 210          * they cannot be detected programatically
 211          */
 212         am200_init();
 213         am300_init();
 214 }
 215
 216 static void __init gumstix_init(void)
 217 {
 218         pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
 219
 220         pxa_set_ffuart_info(NULL);
 221         pxa_set_btuart_info(NULL);
 222         pxa_set_stuart_info(NULL);
 223         pxa_set_hwuart_info(NULL);
 224
 225         gumstix_bluetooth_init();
 226         gumstix_udc_init();
 227         gumstix_mmc_init();
 228         (void) platform_add_devices(devices, ARRAY_SIZE(devices));
 229         carrier_board_init();
 230 }
 231
 232 MACHINE_START(GUMSTIX, "Gumstix")
 233         .atag_offset    = 0x100, /* match u-boot bi_boot_params */
 234         .map_io         = pxa25x_map_io,
 235         .nr_irqs        = PXA_NR_IRQS,
 236         .init_irq       = pxa25x_init_irq,
 237         .handle_irq     = pxa25x_handle_irq,
 238         .init_time      = pxa_timer_init,
 239         .init_machine   = gumstix_init,
 240         .restart        = pxa_restart,
 241 MACHINE_END