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/memory.h>
30#include <asm/mach-types.h>
31#include <mach/hardware.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
45#include "generic.h"
46
47static struct resource flash_resource = {
48	.start	= 0x00000000,
49	.end	= SZ_64M - 1,
50	.flags	= IORESOURCE_MEM,
51};
52
53static struct mtd_partition gumstix_partitions[] = {
54	{
55		.name =		"Bootloader",
56		.size =		0x00040000,
57		.offset =	0,
58		.mask_flags =	MTD_WRITEABLE  /* force read-only */
59	} , {
60		.name =		"rootfs",
61		.size =		MTDPART_SIZ_FULL,
62		.offset =	MTDPART_OFS_APPEND
63	}
64};
65
66static struct flash_platform_data gumstix_flash_data = {
67	.map_name	= "cfi_probe",
68	.parts		= gumstix_partitions,
69	.nr_parts	= ARRAY_SIZE(gumstix_partitions),
70	.width		= 2,
71};
72
73static struct platform_device gumstix_flash_device = {
74	.name		= "pxa2xx-flash",
75	.id		= 0,
76	.dev = {
77		.platform_data = &gumstix_flash_data,
78	},
79	.resource = &flash_resource,
80	.num_resources = 1,
81};
82
83static struct platform_device *devices[] __initdata = {
84	&gumstix_flash_device,
85};
86
87#ifdef CONFIG_MMC_PXA
88static struct pxamci_platform_data gumstix_mci_platform_data = {
89	.ocr_mask		= MMC_VDD_32_33|MMC_VDD_33_34,
90};
91
92static void __init gumstix_mmc_init(void)
93{
94	pxa_set_mci_info(&gumstix_mci_platform_data);
95}
96#else
97static void __init gumstix_mmc_init(void)
98{
99	pr_debug("Gumstix mmc disabled\n");
100}
101#endif
102
103#ifdef CONFIG_USB_PXA25X
104static struct gpiod_lookup_table gumstix_gpio_vbus_gpiod_table = {
105	.dev_id = "gpio-vbus",
106	.table = {
107		GPIO_LOOKUP("gpio-pxa", GPIO_GUMSTIX_USB_GPIOn,
108			    "vbus", GPIO_ACTIVE_HIGH),
109		GPIO_LOOKUP("gpio-pxa", GPIO_GUMSTIX_USB_GPIOx,
110			    "pullup", GPIO_ACTIVE_HIGH),
111		{ },
112	},
113};
114
115static struct platform_device gumstix_gpio_vbus = {
116	.name	= "gpio-vbus",
117	.id	= -1,
118};
119
120static void __init gumstix_udc_init(void)
121{
122	gpiod_add_lookup_table(&gumstix_gpio_vbus_gpiod_table);
123	platform_device_register(&gumstix_gpio_vbus);
124}
125#else
126static void gumstix_udc_init(void)
127{
128	pr_debug("Gumstix udc is disabled\n");
129}
130#endif
131
132#ifdef CONFIG_BT
133/* Normally, the bootloader would have enabled this 32kHz clock but many
134** boards still have u-boot 1.1.4 so we check if it has been turned on and
135** if not, we turn it on with a warning message. */
136static void gumstix_setup_bt_clock(void)
137{
138	int timeout = 500;
139
140	if (!(readl(OSCC) & OSCC_OOK))
141		pr_warn("32kHz clock was not on. Bootloader may need to be updated\n");
142	else
143		return;
144
145	writel(readl(OSCC) | OSCC_OON, OSCC);
146	do {
147		if (readl(OSCC) & OSCC_OOK)
148			break;
149		udelay(1);
150	} while (--timeout);
151	if (!timeout)
152		pr_err("Failed to start 32kHz clock\n");
153}
154
155static void __init gumstix_bluetooth_init(void)
156{
157	int err;
158
159	gumstix_setup_bt_clock();
160
161	err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
162	if (err) {
163		pr_err("gumstix: failed request gpio for bluetooth reset\n");
164		return;
165	}
166
167	err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
168	if (err) {
169		pr_err("gumstix: can't reset bluetooth\n");
170		return;
171	}
172	gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
173	udelay(100);
174	gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
175}
176#else
177static void gumstix_bluetooth_init(void)
178{
179	pr_debug("Gumstix Bluetooth is disabled\n");
180}
181#endif
182
183static unsigned long gumstix_pin_config[] __initdata = {
184	GPIO12_32KHz,
185	/* BTUART */
186	GPIO42_HWUART_RXD,
187	GPIO43_HWUART_TXD,
188	GPIO44_HWUART_CTS,
189	GPIO45_HWUART_RTS,
190	/* MMC */
191	GPIO6_MMC_CLK,
192	GPIO53_MMC_CLK,
193	GPIO8_MMC_CS0,
194};
195
196int __attribute__((weak)) am200_init(void)
197{
198	return 0;
199}
200
201int __attribute__((weak)) am300_init(void)
202{
203	return 0;
204}
205
206static void __init carrier_board_init(void)
207{
208	/*
209	 * put carrier/expansion board init here if
210	 * they cannot be detected programatically
211	 */
212	am200_init();
213	am300_init();
214}
215
216static void __init gumstix_init(void)
217{
218	pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
219
220	pxa_set_ffuart_info(NULL);
221	pxa_set_btuart_info(NULL);
222	pxa_set_stuart_info(NULL);
223	pxa_set_hwuart_info(NULL);
224
225	gumstix_bluetooth_init();
226	gumstix_udc_init();
227	gumstix_mmc_init();
228	(void) platform_add_devices(devices, ARRAY_SIZE(devices));
229	carrier_board_init();
230}
231
232MACHINE_START(GUMSTIX, "Gumstix")
233	.atag_offset	= 0x100, /* match u-boot bi_boot_params */
234	.map_io		= pxa25x_map_io,
235	.nr_irqs	= PXA_NR_IRQS,
236	.init_irq	= pxa25x_init_irq,
237	.handle_irq	= pxa25x_handle_irq,
238	.init_time	= pxa_timer_init,
239	.init_machine	= gumstix_init,
240	.restart	= pxa_restart,
241MACHINE_END
242