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/page.h> 30 #include <asm/mach-types.h> 31 #include <asm/irq.h> 32 #include <linux/sizes.h> 33 34 #include <asm/mach/arch.h> 35 #include <asm/mach/map.h> 36 #include <asm/mach/irq.h> 37 #include <asm/mach/flash.h> 38 39 #include "pxa25x.h" 40 #include <linux/platform_data/mmc-pxamci.h> 41 #include "udc.h" 42 #include "gumstix.h" 43 44 #include "generic.h" 45 46 static struct resource flash_resource = { 47 .start = 0x00000000, 48 .end = SZ_64M - 1, 49 .flags = IORESOURCE_MEM, 50 }; 51 52 static struct mtd_partition gumstix_partitions[] = { 53 { 54 .name = "Bootloader", 55 .size = 0x00040000, 56 .offset = 0, 57 .mask_flags = MTD_WRITEABLE /* force read-only */ 58 } , { 59 .name = "rootfs", 60 .size = MTDPART_SIZ_FULL, 61 .offset = MTDPART_OFS_APPEND 62 } 63 }; 64 65 static struct flash_platform_data gumstix_flash_data = { 66 .map_name = "cfi_probe", 67 .parts = gumstix_partitions, 68 .nr_parts = ARRAY_SIZE(gumstix_partitions), 69 .width = 2, 70 }; 71 72 static struct platform_device gumstix_flash_device = { 73 .name = "pxa2xx-flash", 74 .id = 0, 75 .dev = { 76 .platform_data = &gumstix_flash_data, 77 }, 78 .resource = &flash_resource, 79 .num_resources = 1, 80 }; 81 82 static struct platform_device *devices[] __initdata = { 83 &gumstix_flash_device, 84 }; 85 86 #ifdef CONFIG_MMC_PXA 87 static struct pxamci_platform_data gumstix_mci_platform_data = { 88 .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34, 89 }; 90 91 static void __init gumstix_mmc_init(void) 92 { 93 pxa_set_mci_info(&gumstix_mci_platform_data); 94 } 95 #else 96 static void __init gumstix_mmc_init(void) 97 { 98 pr_debug("Gumstix mmc disabled\n"); 99 } 100 #endif 101 102 #ifdef CONFIG_USB_PXA25X 103 static struct gpiod_lookup_table gumstix_gpio_vbus_gpiod_table = { 104 .dev_id = "gpio-vbus", 105 .table = { 106 GPIO_LOOKUP("gpio-pxa", GPIO_GUMSTIX_USB_GPIOn, 107 "vbus", GPIO_ACTIVE_HIGH), 108 GPIO_LOOKUP("gpio-pxa", GPIO_GUMSTIX_USB_GPIOx, 109 "pullup", GPIO_ACTIVE_HIGH), 110 { }, 111 }, 112 }; 113 114 static struct platform_device gumstix_gpio_vbus = { 115 .name = "gpio-vbus", 116 .id = -1, 117 }; 118 119 static void __init gumstix_udc_init(void) 120 { 121 gpiod_add_lookup_table(&gumstix_gpio_vbus_gpiod_table); 122 platform_device_register(&gumstix_gpio_vbus); 123 } 124 #else 125 static void gumstix_udc_init(void) 126 { 127 pr_debug("Gumstix udc is disabled\n"); 128 } 129 #endif 130 131 #ifdef CONFIG_BT 132 /* Normally, the bootloader would have enabled this 32kHz clock but many 133 ** boards still have u-boot 1.1.4 so we check if it has been turned on and 134 ** if not, we turn it on with a warning message. */ 135 static void gumstix_setup_bt_clock(void) 136 { 137 int timeout = 500; 138 139 if (!(readl(OSCC) & OSCC_OOK)) 140 pr_warn("32kHz clock was not on. Bootloader may need to be updated\n"); 141 else 142 return; 143 144 writel(readl(OSCC) | OSCC_OON, OSCC); 145 do { 146 if (readl(OSCC) & OSCC_OOK) 147 break; 148 udelay(1); 149 } while (--timeout); 150 if (!timeout) 151 pr_err("Failed to start 32kHz clock\n"); 152 } 153 154 static void __init gumstix_bluetooth_init(void) 155 { 156 int err; 157 158 gumstix_setup_bt_clock(); 159 160 err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST"); 161 if (err) { 162 pr_err("gumstix: failed request gpio for bluetooth reset\n"); 163 return; 164 } 165 166 err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1); 167 if (err) { 168 pr_err("gumstix: can't reset bluetooth\n"); 169 return; 170 } 171 gpio_set_value(GPIO_GUMSTIX_BTRESET, 0); 172 udelay(100); 173 gpio_set_value(GPIO_GUMSTIX_BTRESET, 1); 174 } 175 #else 176 static void gumstix_bluetooth_init(void) 177 { 178 pr_debug("Gumstix Bluetooth is disabled\n"); 179 } 180 #endif 181 182 static unsigned long gumstix_pin_config[] __initdata = { 183 GPIO12_32KHz, 184 /* BTUART */ 185 GPIO42_HWUART_RXD, 186 GPIO43_HWUART_TXD, 187 GPIO44_HWUART_CTS, 188 GPIO45_HWUART_RTS, 189 /* MMC */ 190 GPIO6_MMC_CLK, 191 GPIO53_MMC_CLK, 192 GPIO8_MMC_CS0, 193 }; 194 195 int __attribute__((weak)) am200_init(void) 196 { 197 return 0; 198 } 199 200 int __attribute__((weak)) am300_init(void) 201 { 202 return 0; 203 } 204 205 static void __init carrier_board_init(void) 206 { 207 /* 208 * put carrier/expansion board init here if 209 * they cannot be detected programatically 210 */ 211 am200_init(); 212 am300_init(); 213 } 214 215 static void __init gumstix_init(void) 216 { 217 pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config)); 218 219 pxa_set_ffuart_info(NULL); 220 pxa_set_btuart_info(NULL); 221 pxa_set_stuart_info(NULL); 222 pxa_set_hwuart_info(NULL); 223 224 gumstix_bluetooth_init(); 225 gumstix_udc_init(); 226 gumstix_mmc_init(); 227 (void) platform_add_devices(devices, ARRAY_SIZE(devices)); 228 carrier_board_init(); 229 } 230 231 MACHINE_START(GUMSTIX, "Gumstix") 232 .atag_offset = 0x100, /* match u-boot bi_boot_params */ 233 .map_io = pxa25x_map_io, 234 .nr_irqs = PXA_NR_IRQS, 235 .init_irq = pxa25x_init_irq, 236 .init_time = pxa_timer_init, 237 .init_machine = gumstix_init, 238 .restart = pxa_restart, 239 MACHINE_END 240