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gumstix.c
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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>
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 = {
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 = {
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 
171  if (err) {
172  pr_err("gumstix: can't reset bluetooth\n");
173  return;
174  }
176  udelay(100);
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 */
193  /* MMC */
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 
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  .nr_irqs = PXA_NR_IRQS,
239  .init_irq = pxa25x_init_irq,
240  .handle_irq = pxa25x_handle_irq,
241  .timer = &pxa_timer,
242  .init_machine = gumstix_init,
243  .restart = pxa_restart,