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/arch/arm/mach-pxa/gumstix.c

https://github.com/AICP/kernel_asus_grouper
C | 242 lines | 187 code | 30 blank | 25 comment | 6 complexity | 1ade2e806c132533bbede74d0fbb39db MD5 | raw file
  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
 50static struct resource flash_resource = {
 51	.start	= 0x00000000,
 52	.end	= SZ_64M - 1,
 53	.flags	= IORESOURCE_MEM,
 54};
 55
 56static 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
 69static 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
 76static 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
 86static struct platform_device *devices[] __initdata = {
 87	&gumstix_flash_device,
 88};
 89
 90#ifdef CONFIG_MMC_PXA
 91static 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
 98static void __init gumstix_mmc_init(void)
 99{
100	pxa_set_mci_info(&gumstix_mci_platform_data);
101}
102#else
103static void __init gumstix_mmc_init(void)
104{
105	pr_debug("Gumstix mmc disabled\n");
106}
107#endif
108
109#ifdef CONFIG_USB_PXA25X
110static struct gpio_vbus_mach_info gumstix_udc_info = {
111	.gpio_vbus		= GPIO_GUMSTIX_USB_GPIOn,
112	.gpio_pullup		= GPIO_GUMSTIX_USB_GPIOx,
113};
114
115static struct platform_device gumstix_gpio_vbus = {
116	.name	= "gpio-vbus",
117	.id	= -1,
118	.dev	= {
119		.platform_data	= &gumstix_udc_info,
120	},
121};
122
123static void __init gumstix_udc_init(void)
124{
125	platform_device_register(&gumstix_gpio_vbus);
126}
127#else
128static 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. */
138static 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
158static 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
180static void gumstix_bluetooth_init(void)
181{
182	pr_debug("Gumstix Bluetooth is disabled\n");
183}
184#endif
185
186static 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
199int __attribute__((weak)) am200_init(void)
200{
201	return 0;
202}
203
204int __attribute__((weak)) am300_init(void)
205{
206	return 0;
207}
208
209static 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
219static 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
235MACHINE_START(GUMSTIX, "Gumstix")
236	.boot_params	= 0xa0000100, /* 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,
242MACHINE_END