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