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/property.h>
25 #include <linux/gpio.h>
26 #include <linux/err.h>
27 #include <linux/clk.h>
28
29 #include <asm/setup.h>
30 #include <asm/page.h>
31 #include <asm/mach-types.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 #include "devices.h"
45
46 #include "generic.h"
47
48 static struct resource flash_resource = {
49 .start = 0x00000000,
50 .end = SZ_64M - 1,
51 .flags = IORESOURCE_MEM,
52 };
53
54 static struct mtd_partition gumstix_partitions[] = {
55 {
56 .name = "Bootloader",
57 .size = 0x00040000,
58 .offset = 0,
59 .mask_flags = MTD_WRITEABLE /* force read-only */
60 } , {
61 .name = "rootfs",
62 .size = MTDPART_SIZ_FULL,
63 .offset = MTDPART_OFS_APPEND
64 }
65 };
66
67 static struct flash_platform_data gumstix_flash_data = {
68 .map_name = "cfi_probe",
69 .parts = gumstix_partitions,
70 .nr_parts = ARRAY_SIZE(gumstix_partitions),
71 .width = 2,
72 };
73
74 static struct platform_device gumstix_flash_device = {
75 .name = "pxa2xx-flash",
76 .id = 0,
77 .dev = {
78 .platform_data = &gumstix_flash_data,
79 },
80 .resource = &flash_resource,
81 .num_resources = 1,
82 };
83
84 static struct platform_device *devices[] __initdata = {
85 &gumstix_flash_device,
86 };
87
88 #ifdef CONFIG_MMC_PXA
89 static struct pxamci_platform_data gumstix_mci_platform_data = {
90 .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34,
91 };
92
93 static void __init gumstix_mmc_init(void)
94 {
95 pxa_set_mci_info(&gumstix_mci_platform_data, NULL);
96 }
97 #else
98 static void __init gumstix_mmc_init(void)
99 {
100 pr_debug("Gumstix mmc disabled\n");
101 }
102 #endif
103
104 #if IS_ENABLED(CONFIG_USB_PXA25X)
105 static const struct property_entry gumstix_vbus_props[] __initconst = {
106 PROPERTY_ENTRY_GPIO("vbus-gpios", &pxa2xx_gpiochip_node,
107 GPIO_GUMSTIX_USB_GPIOn, GPIO_ACTIVE_HIGH),
108 PROPERTY_ENTRY_GPIO("pullup-gpios", &pxa2xx_gpiochip_node,
109 GPIO_GUMSTIX_USB_GPIOx, GPIO_ACTIVE_HIGH),
110 { }
111 };
112
113 static const struct platform_device_info gumstix_gpio_vbus_info __initconst = {
114 .name = "gpio-vbus",
115 .id = PLATFORM_DEVID_NONE,
116 .properties = gumstix_vbus_props,
117 };
118
119 static void __init gumstix_udc_init(void)
120 {
121 platform_device_register_full(&gumstix_gpio_vbus_info);
122 }
123 #else
124 static void gumstix_udc_init(void)
125 {
126 pr_debug("Gumstix udc is disabled\n");
127 }
128 #endif
129
130 #ifdef CONFIG_BT
131 /* Normally, the bootloader would have enabled this 32kHz clock but many
132 ** boards still have u-boot 1.1.4 so we check if it has been turned on and
133 ** if not, we turn it on with a warning message. */
134 static void gumstix_setup_bt_clock(void)
135 {
136 int timeout = 500;
137
138 if (!(readl(OSCC) & OSCC_OOK))
139 pr_warn("32kHz clock was not on. Bootloader may need to be updated\n");
140 else
141 return;
142
143 writel(readl(OSCC) | OSCC_OON, OSCC);
144 do {
145 if (readl(OSCC) & OSCC_OOK)
146 break;
147 udelay(1);
148 } while (--timeout);
149 if (!timeout)
150 pr_err("Failed to start 32kHz clock\n");
151 }
152
153 static void __init gumstix_bluetooth_init(void)
154 {
155 int err;
156
157 gumstix_setup_bt_clock();
158
159 err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
160 if (err) {
161 pr_err("gumstix: failed request gpio for bluetooth reset\n");
162 return;
163 }
164
165 err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
166 if (err) {
167 pr_err("gumstix: can't reset bluetooth\n");
168 return;
169 }
170 gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
171 udelay(100);
172 gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
173 }
174 #else
175 static void gumstix_bluetooth_init(void)
176 {
177 pr_debug("Gumstix Bluetooth is disabled\n");
178 }
179 #endif
180
181 static unsigned long gumstix_pin_config[] __initdata = {
182 GPIO12_32KHz,
183 /* BTUART */
184 GPIO42_HWUART_RXD,
185 GPIO43_HWUART_TXD,
186 GPIO44_HWUART_CTS,
187 GPIO45_HWUART_RTS,
188 /* MMC */
189 GPIO6_MMC_CLK,
190 GPIO53_MMC_CLK,
191 GPIO8_MMC_CS0,
192 };
193
194 int __attribute__((weak)) am200_init(void)
195 {
196 return 0;
197 }
198
199 int __attribute__((weak)) am300_init(void)
200 {
201 return 0;
202 }
203
204 static void __init carrier_board_init(void)
205 {
206 /*
207 * put carrier/expansion board init here if
208 * they cannot be detected programatically
209 */
210 am200_init();
211 am300_init();
212 }
213
214 static void __init gumstix_init(void)
215 {
216 pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
217
218 pxa_set_ffuart_info(NULL);
219 pxa_set_btuart_info(NULL);
220 pxa_set_stuart_info(NULL);
221 pxa_set_hwuart_info(NULL);
222
223 gumstix_bluetooth_init();
224 gumstix_udc_init();
225 gumstix_mmc_init();
226 (void) platform_add_devices(devices, ARRAY_SIZE(devices));
227 carrier_board_init();
228 }
229
230 MACHINE_START(GUMSTIX, "Gumstix")
231 .atag_offset = 0x100, /* match u-boot bi_boot_params */
232 .map_io = pxa25x_map_io,
233 .nr_irqs = PXA_NR_IRQS,
234 .init_irq = pxa25x_init_irq,
235 .init_time = pxa_timer_init,
236 .init_machine = gumstix_init,
237 .restart = pxa_restart,
238 MACHINE_END
239
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.