arm/mach-pxa/gumstix.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *  linux/arch/arm/mach-pxa/gumstix.c
0004  *
0005  *  Support for the Gumstix motherboards.
0006  *
0007  *  Original Author:    Craig Hughes
0008  *  Created:    Feb 14, 2008
0009  *  Copyright:  Craig Hughes
0010  *
0011  *  Implemented based on lubbock.c by Nicolas Pitre and code from Craig
0012  *  Hughes
0013  */
0014
0015 #include <linux/module.h>
0016 #include <linux/kernel.h>
0017 #include <linux/init.h>
0018 #include <linux/platform_device.h>
0019 #include <linux/interrupt.h>
0020 #include <linux/delay.h>
0021 #include <linux/mtd/mtd.h>
0022 #include <linux/mtd/partitions.h>
0023 #include <linux/gpio/machine.h>
0024 #include <linux/gpio.h>
0025 #include <linux/err.h>
0026 #include <linux/clk.h>
0027
0028 #include <asm/setup.h>
0029 #include <asm/memory.h>
0030 #include <asm/mach-types.h>
0031 #include <asm/irq.h>
0032 #include <linux/sizes.h>
0033
0034 #include <asm/mach/arch.h>
0035 #include <asm/mach/map.h>
0036 #include <asm/mach/irq.h>
0037 #include <asm/mach/flash.h>
0038
0039 #include "pxa25x.h"
0040 #include <linux/platform_data/mmc-pxamci.h>
0041 #include "udc.h"
0042 #include "gumstix.h"
0043
0044 #include "generic.h"
0045
0046 static struct resource flash_resource = {
0047     .start  = 0x00000000,
0048     .end    = SZ_64M - 1,
0049     .flags  = IORESOURCE_MEM,
0050 };
0051
0052 static struct mtd_partition gumstix_partitions[] = {
0053     {
0054         .name =     "Bootloader",
0055         .size =     0x00040000,
0056         .offset =   0,
0057         .mask_flags =   MTD_WRITEABLE  /* force read-only */
0058     } , {
0059         .name =     "rootfs",
0060         .size =     MTDPART_SIZ_FULL,
0061         .offset =   MTDPART_OFS_APPEND
0062     }
0063 };
0064
0065 static struct flash_platform_data gumstix_flash_data = {
0066     .map_name   = "cfi_probe",
0067     .parts      = gumstix_partitions,
0068     .nr_parts   = ARRAY_SIZE(gumstix_partitions),
0069     .width      = 2,
0070 };
0071
0072 static struct platform_device gumstix_flash_device = {
0073     .name       = "pxa2xx-flash",
0074     .id     = 0,
0075     .dev = {
0076         .platform_data = &gumstix_flash_data,
0077     },
0078     .resource = &flash_resource,
0079     .num_resources = 1,
0080 };
0081
0082 static struct platform_device *devices[] __initdata = {
0083     &gumstix_flash_device,
0084 };
0085
0086 #ifdef CONFIG_MMC_PXA
0087 static struct pxamci_platform_data gumstix_mci_platform_data = {
0088     .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
0089 };
0090
0091 static void __init gumstix_mmc_init(void)
0092 {
0093     pxa_set_mci_info(&gumstix_mci_platform_data);
0094 }
0095 #else
0096 static void __init gumstix_mmc_init(void)
0097 {
0098     pr_debug("Gumstix mmc disabled\n");
0099 }
0100 #endif
0101
0102 #ifdef CONFIG_USB_PXA25X
0103 static struct gpiod_lookup_table gumstix_gpio_vbus_gpiod_table = {
0104     .dev_id = "gpio-vbus",
0105     .table = {
0106         GPIO_LOOKUP("gpio-pxa", GPIO_GUMSTIX_USB_GPIOn,
0107                 "vbus", GPIO_ACTIVE_HIGH),
0108         GPIO_LOOKUP("gpio-pxa", GPIO_GUMSTIX_USB_GPIOx,
0109                 "pullup", GPIO_ACTIVE_HIGH),
0110         { },
0111     },
0112 };
0113
0114 static struct platform_device gumstix_gpio_vbus = {
0115     .name   = "gpio-vbus",
0116     .id = -1,
0117 };
0118
0119 static void __init gumstix_udc_init(void)
0120 {
0121     gpiod_add_lookup_table(&gumstix_gpio_vbus_gpiod_table);
0122     platform_device_register(&gumstix_gpio_vbus);
0123 }
0124 #else
0125 static void gumstix_udc_init(void)
0126 {
0127     pr_debug("Gumstix udc is disabled\n");
0128 }
0129 #endif
0130
0131 #ifdef CONFIG_BT
0132 /* Normally, the bootloader would have enabled this 32kHz clock but many
0133 ** boards still have u-boot 1.1.4 so we check if it has been turned on and
0134 ** if not, we turn it on with a warning message. */
0135 static void gumstix_setup_bt_clock(void)
0136 {
0137     int timeout = 500;
0138
0139     if (!(readl(OSCC) & OSCC_OOK))
0140         pr_warn("32kHz clock was not on. Bootloader may need to be updated\n");
0141     else
0142         return;
0143
0144     writel(readl(OSCC) | OSCC_OON, OSCC);
0145     do {
0146         if (readl(OSCC) & OSCC_OOK)
0147             break;
0148         udelay(1);
0149     } while (--timeout);
0150     if (!timeout)
0151         pr_err("Failed to start 32kHz clock\n");
0152 }
0153
0154 static void __init gumstix_bluetooth_init(void)
0155 {
0156     int err;
0157
0158     gumstix_setup_bt_clock();
0159
0160     err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
0161     if (err) {
0162         pr_err("gumstix: failed request gpio for bluetooth reset\n");
0163         return;
0164     }
0165
0166     err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
0167     if (err) {
0168         pr_err("gumstix: can't reset bluetooth\n");
0169         return;
0170     }
0171     gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
0172     udelay(100);
0173     gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
0174 }
0175 #else
0176 static void gumstix_bluetooth_init(void)
0177 {
0178     pr_debug("Gumstix Bluetooth is disabled\n");
0179 }
0180 #endif
0181
0182 static unsigned long gumstix_pin_config[] __initdata = {
0183     GPIO12_32KHz,
0184     /* BTUART */
0185     GPIO42_HWUART_RXD,
0186     GPIO43_HWUART_TXD,
0187     GPIO44_HWUART_CTS,
0188     GPIO45_HWUART_RTS,
0189     /* MMC */
0190     GPIO6_MMC_CLK,
0191     GPIO53_MMC_CLK,
0192     GPIO8_MMC_CS0,
0193 };
0194
0195 int __attribute__((weak)) am200_init(void)
0196 {
0197     return 0;
0198 }
0199
0200 int __attribute__((weak)) am300_init(void)
0201 {
0202     return 0;
0203 }
0204
0205 static void __init carrier_board_init(void)
0206 {
0207     /*
0208      * put carrier/expansion board init here if
0209      * they cannot be detected programatically
0210      */
0211     am200_init();
0212     am300_init();
0213 }
0214
0215 static void __init gumstix_init(void)
0216 {
0217     pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
0218
0219     pxa_set_ffuart_info(NULL);
0220     pxa_set_btuart_info(NULL);
0221     pxa_set_stuart_info(NULL);
0222     pxa_set_hwuart_info(NULL);
0223
0224     gumstix_bluetooth_init();
0225     gumstix_udc_init();
0226     gumstix_mmc_init();
0227     (void) platform_add_devices(devices, ARRAY_SIZE(devices));
0228     carrier_board_init();
0229 }
0230
0231 MACHINE_START(GUMSTIX, "Gumstix")
0232     .atag_offset    = 0x100, /* match u-boot bi_boot_params */
0233     .map_io     = pxa25x_map_io,
0234     .nr_irqs    = PXA_NR_IRQS,
0235     .init_irq   = pxa25x_init_irq,
0236     .handle_irq = pxa25x_handle_irq,
0237     .init_time  = pxa_timer_init,
0238     .init_machine   = gumstix_init,
0239     .restart    = pxa_restart,
0240 MACHINE_END