[deliverable/linux.git] / arch / arm / mach-keystone / keystone.c

/*
 * Keystone2 based boards and SOC related code.
 *
 * Copyright 2013 Texas Instruments, Inc.
 *	Cyril Chemparathy <cyril@ti.com>
 *	Santosh Shilimkar <santosh.shillimkar@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 */
#include <linux/io.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/memblock.h>

#include <asm/setup.h>
#include <asm/mach/map.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/smp_plat.h>
#include <asm/memory.h>

#include "memory.h"

#include "keystone.h"

static unsigned long keystone_dma_pfn_offset __read_mostly;

static int keystone_platform_notifier(struct notifier_block *nb,
				      unsigned long event, void *data)
{
	struct device *dev = data;

	if (event != BUS_NOTIFY_ADD_DEVICE)
		return NOTIFY_DONE;

	if (!dev)
		return NOTIFY_BAD;

	if (!dev->of_node) {
		dev->dma_pfn_offset = keystone_dma_pfn_offset;
		dev_err(dev, "set dma_pfn_offset%08lx\n",
			dev->dma_pfn_offset);
	}
	return NOTIFY_OK;
}

static struct notifier_block platform_nb = {
	.notifier_call = keystone_platform_notifier,
};

static void __init keystone_init(void)
{
	if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) {
		keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
						   KEYSTONE_LOW_PHYS_START);
		bus_register_notifier(&platform_bus_type, &platform_nb);
	}
	keystone_pm_runtime_init();
}

static long long __init keystone_pv_fixup(void)
{
	long long offset;
	phys_addr_t mem_start, mem_end;

	mem_start = memblock_start_of_DRAM();
	mem_end = memblock_end_of_DRAM();

	/* nothing to do if we are running out of the <32-bit space */
	if (mem_start >= KEYSTONE_LOW_PHYS_START &&
	    mem_end   <= KEYSTONE_LOW_PHYS_END)
		return 0;

	if (mem_start < KEYSTONE_HIGH_PHYS_START ||
	    mem_end   > KEYSTONE_HIGH_PHYS_END) {
		pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
		        (u64)mem_start, (u64)mem_end);
		return 0;
	}

	offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START;

	/* Populate the arch idmap hook */
	arch_phys_to_idmap_offset = -offset;

	return offset;
}

static const char *const keystone_match[] __initconst = {
	"ti,k2hk",
	"ti,k2e",
	"ti,k2l",
	"ti,k2g",
	"ti,keystone",
	NULL,
};

DT_MACHINE_START(KEYSTONE, "Keystone")
#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
	.dma_zone_size	= SZ_2G,
#endif
	.smp		= smp_ops(keystone_smp_ops),
	.init_machine	= keystone_init,
	.dt_compat	= keystone_match,
	.pv_fixup	= keystone_pv_fixup,
MACHINE_END
Commit	Line	Data
828989ad SS	1	/*
	2	* Keystone2 based boards and SOC related code.
	3	*
	4	* Copyright 2013 Texas Instruments, Inc.
	5	* Cyril Chemparathy <cyril@ti.com>
	6	* Santosh Shilimkar <santosh.shillimkar@ti.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms and conditions of the GNU General Public License,
	10	* version 2, as published by the Free Software Foundation.
	11	*/
	12	#include <linux/io.h>
	13	#include <linux/of.h>
	14	#include <linux/init.h>
	15	#include <linux/of_platform.h>
	16	#include <linux/of_address.h>
bbea06f3	17	#include <linux/memblock.h>
828989ad SS	18
	19	#include <asm/setup.h>
	20	#include <asm/mach/map.h>
	21	#include <asm/mach/arch.h>
	22	#include <asm/mach/time.h>
f07cb6a0	23	#include <asm/smp_plat.h>
5eb3da72 SS	24	#include <asm/memory.h>
	25
	26	#include "memory.h"
f07cb6a0 SS	27
f07cb6a0 SS	28	#include "keystone.h"
828989ad	29
14f37914 SS	30	static unsigned long keystone_dma_pfn_offset __read_mostly;
	31
	32	static int keystone_platform_notifier(struct notifier_block *nb,
	33	unsigned long event, void *data)
	34	{
	35	struct device *dev = data;
	36
	37	if (event != BUS_NOTIFY_ADD_DEVICE)
	38	return NOTIFY_DONE;
	39
	40	if (!dev)
	41	return NOTIFY_BAD;
	42
	43	if (!dev->of_node) {
	44	dev->dma_pfn_offset = keystone_dma_pfn_offset;
	45	dev_err(dev, "set dma_pfn_offset%08lx\n",
	46	dev->dma_pfn_offset);
	47	}
	48	return NOTIFY_OK;
	49	}
828989ad	50
30b5f4d6 RK	51	static struct notifier_block platform_nb = {
	52	.notifier_call = keystone_platform_notifier,
	53	};
	54
828989ad SS	55	static void __init keystone_init(void)
828989ad SS	56	{
30b5f4d6 RK	57	if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) {
	58	keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
	59	KEYSTONE_LOW_PHYS_START);
14f37914	60	bus_register_notifier(&platform_bus_type, &platform_nb);
30b5f4d6 RK	61	}
30b5f4d6 RK	62	keystone_pm_runtime_init();
828989ad SS	63	}
828989ad SS	64
c0b759d8	65	static long long __init keystone_pv_fixup(void)
5eb3da72	66	{
c8ca2b4b	67	long long offset;
5eb3da72 SS	68	phys_addr_t mem_start, mem_end;
5eb3da72 SS	69
bbea06f3 SS	70	mem_start = memblock_start_of_DRAM();
bbea06f3 SS	71	mem_end = memblock_end_of_DRAM();
5eb3da72 SS	72
	73	/* nothing to do if we are running out of the <32-bit space */
	74	if (mem_start >= KEYSTONE_LOW_PHYS_START &&
	75	mem_end <= KEYSTONE_LOW_PHYS_END)
c8ca2b4b	76	return 0;
5eb3da72 SS	77
	78	if (mem_start < KEYSTONE_HIGH_PHYS_START \|\|
	79	mem_end > KEYSTONE_HIGH_PHYS_END) {
	80	pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
c8ca2b4b RK	81	(u64)mem_start, (u64)mem_end);
c8ca2b4b RK	82	return 0;
5eb3da72 SS	83	}
5eb3da72 SS	84
c8ca2b4b	85	offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START;
5eb3da72 SS	86
5eb3da72 SS	87	/* Populate the arch idmap hook */
981b6714	88	arch_phys_to_idmap_offset = -offset;
5eb3da72	89
c8ca2b4b	90	return offset;
5eb3da72 SS	91	}
5eb3da72 SS	92
543c5040	93	static const char *const keystone_match[] __initconst = {
01cf228b NM	94	"ti,k2hk",
	95	"ti,k2e",
	96	"ti,k2l",
3b2d3dc9	97	"ti,k2g",
3babe306	98	"ti,keystone",
828989ad SS	99	NULL,
	100	};
	101
828989ad	102	DT_MACHINE_START(KEYSTONE, "Keystone")
df595a9d SS	103	#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
	104	.dma_zone_size = SZ_2G,
	105	#endif
f07cb6a0	106	.smp = smp_ops(keystone_smp_ops),
828989ad SS	107	.init_machine = keystone_init,
828989ad SS	108	.dt_compat = keystone_match,
c0b759d8	109	.pv_fixup = keystone_pv_fixup,
828989ad	110	MACHINE_END