[mirror_ubuntu-bionic-kernel.git] / arch / arm / mach-vt8500 / vt8500.c

/*
 *  arch/arm/mach-vt8500/vt8500.c
 *
 *  Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/io.h>
#include <linux/pm.h>
#include <linux/reboot.h>

#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/mach/map.h>

#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>

#define LEGACY_GPIO_BASE	0xD8110000
#define LEGACY_PMC_BASE		0xD8130000

/* Registers in GPIO Controller */
#define VT8500_GPIO_MUX_REG	0x200

/* Registers in Power Management Controller */
#define VT8500_HCR_REG		0x12
#define VT8500_PMSR_REG		0x60

static void __iomem *pmc_base;

static void vt8500_restart(enum reboot_mode mode, const char *cmd)
{
	if (pmc_base)
		writel(1, pmc_base + VT8500_PMSR_REG);
}

static struct map_desc vt8500_io_desc[] __initdata = {
	/* SoC MMIO registers */
	[0] = {
		.virtual	= 0xf8000000,
		.pfn		= __phys_to_pfn(0xd8000000),
		.length		= 0x00390000, /* max of all chip variants */
		.type		= MT_DEVICE
	},
};

static void __init vt8500_map_io(void)
{
	iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc));
}

static void vt8500_power_off(void)
{
	local_irq_disable();
	writew(5, pmc_base + VT8500_HCR_REG);
	asm("mcr p15, 0, %0, c7, c0, 4" : : "r" (0));
}

static void __init vt8500_init(void)
{
	struct device_node *np;
#if defined(CONFIG_FB_VT8500) || defined(CONFIG_FB_WM8505)
	struct device_node *fb;
	void __iomem *gpio_base;
#endif

#ifdef CONFIG_FB_VT8500
	fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb");
	if (fb) {
		np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio");
		if (np) {
			gpio_base = of_iomap(np, 0);

			if (!gpio_base)
				pr_err("%s: of_iomap(gpio_mux) failed\n",
								__func__);

			of_node_put(np);
		} else {
			gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
			if (!gpio_base)
				pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
								__func__);
		}
		if (gpio_base) {
			writel(readl(gpio_base + VT8500_GPIO_MUX_REG) | 1,
				gpio_base + VT8500_GPIO_MUX_REG);
			iounmap(gpio_base);
		} else
			pr_err("%s: Could not remap GPIO mux\n", __func__);

		of_node_put(fb);
	}
#endif

#ifdef CONFIG_FB_WM8505
	fb = of_find_compatible_node(NULL, NULL, "wm,wm8505-fb");
	if (fb) {
		np = of_find_compatible_node(NULL, NULL, "wm,wm8505-gpio");
		if (!np)
			np = of_find_compatible_node(NULL, NULL,
							"wm,wm8650-gpio");
		if (np) {
			gpio_base = of_iomap(np, 0);

			if (!gpio_base)
				pr_err("%s: of_iomap(gpio_mux) failed\n",
								__func__);

			of_node_put(np);
		} else {
			gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
			if (!gpio_base)
				pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
								__func__);
		}
		if (gpio_base) {
			writel(readl(gpio_base + VT8500_GPIO_MUX_REG) |
				0x80000000, gpio_base + VT8500_GPIO_MUX_REG);
			iounmap(gpio_base);
		} else
			pr_err("%s: Could not remap GPIO mux\n", __func__);

		of_node_put(fb);
	}
#endif

	np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
	if (np) {
		pmc_base = of_iomap(np, 0);

		if (!pmc_base)
			pr_err("%s:of_iomap(pmc) failed\n", __func__);

		of_node_put(np);
	} else {
		pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
		if (!pmc_base)
			pr_err("%s:ioremap(power_off) failed\n", __func__);
	}
	if (pmc_base)
		pm_power_off = &vt8500_power_off;
	else
		pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n", __func__);
}

static const char * const vt8500_dt_compat[] = {
	"via,vt8500",
	"wm,wm8650",
	"wm,wm8505",
	"wm,wm8750",
	"wm,wm8850",
	NULL
};

DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)")
	.dt_compat	= vt8500_dt_compat,
	.map_io		= vt8500_map_io,
	.init_machine	= vt8500_init,
	.restart	= vt8500_restart,
MACHINE_END
Commit	Line	Data
e9a91de7 TP	1	/*
	2	* arch/arm/mach-vt8500/vt8500.c
	3	*
	4	* Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	#include <linux/io.h>
	22	#include <linux/pm.h>
7b6d864b	23	#include <linux/reboot.h>
e9a91de7 TP	24
	25	#include <asm/mach-types.h>
	26	#include <asm/mach/arch.h>
	27	#include <asm/mach/time.h>
	28	#include <asm/mach/map.h>
	29
	30	#include <linux/of.h>
	31	#include <linux/of_address.h>
	32	#include <linux/of_irq.h>
e9a91de7	33
e9a91de7 TP	34	#define LEGACY_GPIO_BASE 0xD8110000
	35	#define LEGACY_PMC_BASE 0xD8130000
	36
	37	/* Registers in GPIO Controller */
	38	#define VT8500_GPIO_MUX_REG 0x200
	39
	40	/* Registers in Power Management Controller */
	41	#define VT8500_HCR_REG 0x12
	42	#define VT8500_PMSR_REG 0x60
	43
	44	static void __iomem *pmc_base;
	45
192ebb7d	46	static void vt8500_restart(enum reboot_mode mode, const char *cmd)
e9a91de7 TP	47	{
	48	if (pmc_base)
	49	writel(1, pmc_base + VT8500_PMSR_REG);
	50	}
	51
	52	static struct map_desc vt8500_io_desc[] __initdata = {
	53	/* SoC MMIO registers */
	54	[0] = {
	55	.virtual = 0xf8000000,
	56	.pfn = __phys_to_pfn(0xd8000000),
	57	.length = 0x00390000, /* max of all chip variants */
	58	.type = MT_DEVICE
	59	},
	60	};
	61
192ebb7d	62	static void __init vt8500_map_io(void)
e9a91de7 TP	63	{
	64	iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc));
	65	}
	66
	67	static void vt8500_power_off(void)
	68	{
	69	local_irq_disable();
	70	writew(5, pmc_base + VT8500_HCR_REG);
49dd0dcf	71	asm("mcr p15, 0, %0, c7, c0, 4" : : "r" (0));
e9a91de7 TP	72	}
e9a91de7 TP	73
192ebb7d	74	static void __init vt8500_init(void)
e9a91de7	75	{
a4ee7770 TP	76	struct device_node *np;
	77	#if defined(CONFIG_FB_VT8500) \|\| defined(CONFIG_FB_WM8505)
	78	struct device_node *fb;
e9a91de7	79	void __iomem *gpio_base;
a4ee7770	80	#endif
e9a91de7 TP	81
	82	#ifdef CONFIG_FB_VT8500
	83	fb = of_find_compatible_node(NULL, NULL, "via,vt8500-fb");
	84	if (fb) {
	85	np = of_find_compatible_node(NULL, NULL, "via,vt8500-gpio");
	86	if (np) {
	87	gpio_base = of_iomap(np, 0);
	88
	89	if (!gpio_base)
	90	pr_err("%s: of_iomap(gpio_mux) failed\n",
	91	__func__);
	92
	93	of_node_put(np);
	94	} else {
	95	gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
	96	if (!gpio_base)
	97	pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
	98	__func__);
	99	}
	100	if (gpio_base) {
	101	writel(readl(gpio_base + VT8500_GPIO_MUX_REG) \| 1,
	102	gpio_base + VT8500_GPIO_MUX_REG);
	103	iounmap(gpio_base);
	104	} else
	105	pr_err("%s: Could not remap GPIO mux\n", __func__);
	106
	107	of_node_put(fb);
	108	}
	109	#endif
	110
	111	#ifdef CONFIG_FB_WM8505
	112	fb = of_find_compatible_node(NULL, NULL, "wm,wm8505-fb");
	113	if (fb) {
	114	np = of_find_compatible_node(NULL, NULL, "wm,wm8505-gpio");
	115	if (!np)
	116	np = of_find_compatible_node(NULL, NULL,
	117	"wm,wm8650-gpio");
	118	if (np) {
	119	gpio_base = of_iomap(np, 0);
	120
	121	if (!gpio_base)
	122	pr_err("%s: of_iomap(gpio_mux) failed\n",
	123	__func__);
	124
	125	of_node_put(np);
	126	} else {
	127	gpio_base = ioremap(LEGACY_GPIO_BASE, 0x1000);
	128	if (!gpio_base)
	129	pr_err("%s: ioremap(legacy_gpio_mux) failed\n",
	130	__func__);
	131	}
	132	if (gpio_base) {
	133	writel(readl(gpio_base + VT8500_GPIO_MUX_REG) \|
	134	0x80000000, gpio_base + VT8500_GPIO_MUX_REG);
	135	iounmap(gpio_base);
	136	} else
	137	pr_err("%s: Could not remap GPIO mux\n", __func__);
	138
	139	of_node_put(fb);
	140	}
	141	#endif
	142
	143	np = of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
	144	if (np) {
145	pmc_base = of_iomap(np, 0);
146
147	if (!pmc_base)
148	pr_err("%s:of_iomap(pmc) failed\n", __func__);
149
150	of_node_put(np);
151	} else {
152	pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
153	if (!pmc_base)
154	pr_err("%s:ioremap(power_off) failed\n", __func__);
155	}
156	if (pmc_base)
157	pm_power_off = &vt8500_power_off;
158	else
159	pr_err("%s: PMC Hibernation register could not be remapped, not enabling power off!\n", __func__);
e9a91de7 TP	160	}
e9a91de7 TP	161
e9a91de7 TP	162	static const char * const vt8500_dt_compat[] = {
	163	"via,vt8500",
	164	"wm,wm8650",
	165	"wm,wm8505",
8d31bfa5 TP	166	"wm,wm8750",
8d31bfa5 TP	167	"wm,wm8850",
9f8466c6	168	NULL
e9a91de7 TP	169	};
	170
	171	DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)")
	172	.dt_compat = vt8500_dt_compat,
	173	.map_io = vt8500_map_io,
e9a91de7 TP	174	.init_machine = vt8500_init,
	175	.restart = vt8500_restart,
	176	MACHINE_END
	177