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 242