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 gumstix_mmc_init(void)93 static void __init gumstix_mmc_init(void) 94 { 95 pxa_set_mci_info(&gumstix_mci_platform_data, NULL); 96 } 97 #else gumstix_mmc_init(void)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 gumstix_udc_init(void)119 static void __init gumstix_udc_init(void) 120 { 121 platform_device_register_full(&gumstix_gpio_vbus_info); 122 } 123 #else gumstix_udc_init(void)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. */ gumstix_setup_bt_clock(void)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 gumstix_bluetooth_init(void)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 gumstix_bluetooth_init(void)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 am200_init(void)194 int __attribute__((weak)) am200_init(void) 195 { 196 return 0; 197 } 198 am300_init(void)199 int __attribute__((weak)) am300_init(void) 200 { 201 return 0; 202 } 203 carrier_board_init(void)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 gumstix_init(void)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 239