xref: /linux/arch/arm/mach-pxa/gumstix.c (revision 271a74fc875210d3dfcc03d557fb5d86d3990a0f)
1 /*
2  *  linux/arch/arm/mach-pxa/gumstix.c
3  *
4  *  Support for the Gumstix motherboards.
5  *
6  *  Original Author:	Craig Hughes
7  *  Created:	Feb 14, 2008
8  *  Copyright:	Craig Hughes
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License version 2 as
12  *  published by the Free Software Foundation.
13  *
14  *  Implemented based on lubbock.c by Nicolas Pitre and code from Craig
15  *  Hughes
16  */
17 
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22 #include <linux/interrupt.h>
23 #include <linux/delay.h>
24 #include <linux/mtd/mtd.h>
25 #include <linux/mtd/partitions.h>
26 #include <linux/gpio.h>
27 #include <linux/err.h>
28 #include <linux/clk.h>
29 #include <linux/usb/gpio_vbus.h>
30 
31 #include <asm/setup.h>
32 #include <asm/memory.h>
33 #include <asm/mach-types.h>
34 #include <mach/hardware.h>
35 #include <asm/irq.h>
36 #include <asm/sizes.h>
37 
38 #include <asm/mach/arch.h>
39 #include <asm/mach/map.h>
40 #include <asm/mach/irq.h>
41 #include <asm/mach/flash.h>
42 
43 #include <mach/pxa25x.h>
44 #include <mach/mmc.h>
45 #include <mach/udc.h>
46 #include <mach/gumstix.h>
47 
48 #include "generic.h"
49 
50 static struct resource flash_resource = {
51 	.start	= 0x00000000,
52 	.end	= SZ_64M - 1,
53 	.flags	= IORESOURCE_MEM,
54 };
55 
56 static struct mtd_partition gumstix_partitions[] = {
57 	{
58 		.name =		"Bootloader",
59 		.size =		0x00040000,
60 		.offset =	0,
61 		.mask_flags =	MTD_WRITEABLE  /* force read-only */
62 	} , {
63 		.name =		"rootfs",
64 		.size =		MTDPART_SIZ_FULL,
65 		.offset =	MTDPART_OFS_APPEND
66 	}
67 };
68 
69 static struct flash_platform_data gumstix_flash_data = {
70 	.map_name	= "cfi_probe",
71 	.parts		= gumstix_partitions,
72 	.nr_parts	= ARRAY_SIZE(gumstix_partitions),
73 	.width		= 2,
74 };
75 
76 static struct platform_device gumstix_flash_device = {
77 	.name		= "pxa2xx-flash",
78 	.id		= 0,
79 	.dev = {
80 		.platform_data = &gumstix_flash_data,
81 	},
82 	.resource = &flash_resource,
83 	.num_resources = 1,
84 };
85 
86 static struct platform_device *devices[] __initdata = {
87 	&gumstix_flash_device,
88 };
89 
90 #ifdef CONFIG_MMC_PXA
91 static struct pxamci_platform_data gumstix_mci_platform_data = {
92 	.ocr_mask		= MMC_VDD_32_33|MMC_VDD_33_34,
93 	.gpio_card_detect 	= -1,
94 	.gpio_card_ro		= -1,
95 	.gpio_power		= -1,
96 };
97 
98 static void __init gumstix_mmc_init(void)
99 {
100 	pxa_set_mci_info(&gumstix_mci_platform_data);
101 }
102 #else
103 static void __init gumstix_mmc_init(void)
104 {
105 	pr_debug("Gumstix mmc disabled\n");
106 }
107 #endif
108 
109 #ifdef CONFIG_USB_PXA25X
110 static struct gpio_vbus_mach_info gumstix_udc_info = {
111 	.gpio_vbus		= GPIO_GUMSTIX_USB_GPIOn,
112 	.gpio_pullup		= GPIO_GUMSTIX_USB_GPIOx,
113 };
114 
115 static struct platform_device gumstix_gpio_vbus = {
116 	.name	= "gpio-vbus",
117 	.id	= -1,
118 	.dev	= {
119 		.platform_data	= &gumstix_udc_info,
120 	},
121 };
122 
123 static void __init gumstix_udc_init(void)
124 {
125 	platform_device_register(&gumstix_gpio_vbus);
126 }
127 #else
128 static void gumstix_udc_init(void)
129 {
130 	pr_debug("Gumstix udc is disabled\n");
131 }
132 #endif
133 
134 #ifdef CONFIG_BT
135 /* Normally, the bootloader would have enabled this 32kHz clock but many
136 ** boards still have u-boot 1.1.4 so we check if it has been turned on and
137 ** if not, we turn it on with a warning message. */
138 static void gumstix_setup_bt_clock(void)
139 {
140 	int timeout = 500;
141 
142 	if (!(OSCC & OSCC_OOK))
143 		pr_warning("32kHz clock was not on. Bootloader may need to "
144 				"be updated\n");
145 	else
146 		return;
147 
148 	OSCC |= OSCC_OON;
149 	do {
150 		if (OSCC & OSCC_OOK)
151 			break;
152 		udelay(1);
153 	} while (--timeout);
154 	if (!timeout)
155 		pr_err("Failed to start 32kHz clock\n");
156 }
157 
158 static void __init gumstix_bluetooth_init(void)
159 {
160 	int err;
161 
162 	gumstix_setup_bt_clock();
163 
164 	err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
165 	if (err) {
166 		pr_err("gumstix: failed request gpio for bluetooth reset\n");
167 		return;
168 	}
169 
170 	err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
171 	if (err) {
172 		pr_err("gumstix: can't reset bluetooth\n");
173 		return;
174 	}
175 	gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
176 	udelay(100);
177 	gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
178 }
179 #else
180 static void gumstix_bluetooth_init(void)
181 {
182 	pr_debug("Gumstix Bluetooth is disabled\n");
183 }
184 #endif
185 
186 static unsigned long gumstix_pin_config[] __initdata = {
187 	GPIO12_32KHz,
188 	/* BTUART */
189 	GPIO42_HWUART_RXD,
190 	GPIO43_HWUART_TXD,
191 	GPIO44_HWUART_CTS,
192 	GPIO45_HWUART_RTS,
193 	/* MMC */
194 	GPIO6_MMC_CLK,
195 	GPIO53_MMC_CLK,
196 	GPIO8_MMC_CS0,
197 };
198 
199 int __attribute__((weak)) am200_init(void)
200 {
201 	return 0;
202 }
203 
204 int __attribute__((weak)) am300_init(void)
205 {
206 	return 0;
207 }
208 
209 static void __init carrier_board_init(void)
210 {
211 	/*
212 	 * put carrier/expansion board init here if
213 	 * they cannot be detected programatically
214 	 */
215 	am200_init();
216 	am300_init();
217 }
218 
219 static void __init gumstix_init(void)
220 {
221 	pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
222 
223 	pxa_set_ffuart_info(NULL);
224 	pxa_set_btuart_info(NULL);
225 	pxa_set_stuart_info(NULL);
226 	pxa_set_hwuart_info(NULL);
227 
228 	gumstix_bluetooth_init();
229 	gumstix_udc_init();
230 	gumstix_mmc_init();
231 	(void) platform_add_devices(devices, ARRAY_SIZE(devices));
232 	carrier_board_init();
233 }
234 
235 MACHINE_START(GUMSTIX, "Gumstix")
236 	.atag_offset	= 0x100, /* match u-boot bi_boot_params */
237 	.map_io		= pxa25x_map_io,
238 	.init_irq	= pxa25x_init_irq,
239 	.handle_irq	= pxa25x_handle_irq,
240 	.timer		= &pxa_timer,
241 	.init_machine	= gumstix_init,
242 	.restart	= pxa_restart,
243 MACHINE_END
244