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.h> 24 #include <linux/err.h> 25 #include <linux/clk.h> 26 #include <linux/usb/gpio_vbus.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 gpio_vbus_mach_info gumstix_udc_info = { 105 .gpio_vbus = GPIO_GUMSTIX_USB_GPIOn, 106 .gpio_pullup = GPIO_GUMSTIX_USB_GPIOx, 107 }; 108 109 static struct platform_device gumstix_gpio_vbus = { 110 .name = "gpio-vbus", 111 .id = -1, 112 .dev = { 113 .platform_data = &gumstix_udc_info, 114 }, 115 }; 116 117 static void __init gumstix_udc_init(void) 118 { 119 platform_device_register(&gumstix_gpio_vbus); 120 } 121 #else 122 static void gumstix_udc_init(void) 123 { 124 pr_debug("Gumstix udc is disabled\n"); 125 } 126 #endif 127 128 #ifdef CONFIG_BT 129 /* Normally, the bootloader would have enabled this 32kHz clock but many 130 ** boards still have u-boot 1.1.4 so we check if it has been turned on and 131 ** if not, we turn it on with a warning message. */ 132 static void gumstix_setup_bt_clock(void) 133 { 134 int timeout = 500; 135 136 if (!(readl(OSCC) & OSCC_OOK)) 137 pr_warn("32kHz clock was not on. Bootloader may need to be updated\n"); 138 else 139 return; 140 141 writel(readl(OSCC) | OSCC_OON, OSCC); 142 do { 143 if (readl(OSCC) & OSCC_OOK) 144 break; 145 udelay(1); 146 } while (--timeout); 147 if (!timeout) 148 pr_err("Failed to start 32kHz clock\n"); 149 } 150 151 static void __init gumstix_bluetooth_init(void) 152 { 153 int err; 154 155 gumstix_setup_bt_clock(); 156 157 err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST"); 158 if (err) { 159 pr_err("gumstix: failed request gpio for bluetooth reset\n"); 160 return; 161 } 162 163 err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1); 164 if (err) { 165 pr_err("gumstix: can't reset bluetooth\n"); 166 return; 167 } 168 gpio_set_value(GPIO_GUMSTIX_BTRESET, 0); 169 udelay(100); 170 gpio_set_value(GPIO_GUMSTIX_BTRESET, 1); 171 } 172 #else 173 static void gumstix_bluetooth_init(void) 174 { 175 pr_debug("Gumstix Bluetooth is disabled\n"); 176 } 177 #endif 178 179 static unsigned long gumstix_pin_config[] __initdata = { 180 GPIO12_32KHz, 181 /* BTUART */ 182 GPIO42_HWUART_RXD, 183 GPIO43_HWUART_TXD, 184 GPIO44_HWUART_CTS, 185 GPIO45_HWUART_RTS, 186 /* MMC */ 187 GPIO6_MMC_CLK, 188 GPIO53_MMC_CLK, 189 GPIO8_MMC_CS0, 190 }; 191 192 int __attribute__((weak)) am200_init(void) 193 { 194 return 0; 195 } 196 197 int __attribute__((weak)) am300_init(void) 198 { 199 return 0; 200 } 201 202 static void __init carrier_board_init(void) 203 { 204 /* 205 * put carrier/expansion board init here if 206 * they cannot be detected programatically 207 */ 208 am200_init(); 209 am300_init(); 210 } 211 212 static void __init gumstix_init(void) 213 { 214 pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config)); 215 216 pxa_set_ffuart_info(NULL); 217 pxa_set_btuart_info(NULL); 218 pxa_set_stuart_info(NULL); 219 pxa_set_hwuart_info(NULL); 220 221 gumstix_bluetooth_init(); 222 gumstix_udc_init(); 223 gumstix_mmc_init(); 224 (void) platform_add_devices(devices, ARRAY_SIZE(devices)); 225 carrier_board_init(); 226 } 227 228 MACHINE_START(GUMSTIX, "Gumstix") 229 .atag_offset = 0x100, /* match u-boot bi_boot_params */ 230 .map_io = pxa25x_map_io, 231 .nr_irqs = PXA_NR_IRQS, 232 .init_irq = pxa25x_init_irq, 233 .handle_irq = pxa25x_handle_irq, 234 .init_time = pxa_timer_init, 235 .init_machine = gumstix_init, 236 .restart = pxa_restart, 237 MACHINE_END 238