[mirror_ubuntu-artful-kernel.git] / arch / arm / mach-omap2 / omap4-common.c

/*
 * OMAP4 specific common source file.
 *
 * Copyright (C) 2010 Texas Instruments, Inc.
 * Author:
 *	Santosh Shilimkar <santosh.shilimkar@ti.com>
 *
 *
 * This program is free software,you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/platform_device.h>
#include <linux/memblock.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/export.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/irqchip/irq-crossbar.h>
#include <linux/of_address.h>
#include <linux/reboot.h>
#include <linux/genalloc.h>

#include <asm/hardware/cache-l2x0.h>
#include <asm/mach/map.h>
#include <asm/memblock.h>
#include <asm/smp_twd.h>

#include "omap-wakeupgen.h"
#include "soc.h"
#include "iomap.h"
#include "common.h"
#include "prminst44xx.h"
#include "prcm_mpu44xx.h"
#include "omap4-sar-layout.h"
#include "omap-secure.h"
#include "sram.h"

#ifdef CONFIG_CACHE_L2X0
static void __iomem *l2cache_base;
#endif

static void __iomem *sar_ram_base;
static void __iomem *gic_dist_base_addr;
static void __iomem *twd_base;

#define IRQ_LOCALTIMER		29

#ifdef CONFIG_OMAP4_ERRATA_I688
/* Used to implement memory barrier on DRAM path */
#define OMAP4_DRAM_BARRIER_VA			0xfe600000

void __iomem *dram_sync, *sram_sync;

static phys_addr_t paddr;
static u32 size;

void omap_bus_sync(void)
{
	if (dram_sync && sram_sync) {
		writel_relaxed(readl_relaxed(dram_sync), dram_sync);
		writel_relaxed(readl_relaxed(sram_sync), sram_sync);
		isb();
	}
}
EXPORT_SYMBOL(omap_bus_sync);

static int __init omap4_sram_init(void)
{
	struct device_node *np;
	struct gen_pool *sram_pool;

	np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu");
	if (!np)
		pr_warn("%s:Unable to allocate sram needed to handle errata I688\n",
			__func__);
	sram_pool = of_get_named_gen_pool(np, "sram", 0);
	if (!sram_pool)
		pr_warn("%s:Unable to get sram pool needed to handle errata I688\n",
			__func__);
	else
		sram_sync = (void *)gen_pool_alloc(sram_pool, PAGE_SIZE);

	return 0;
}
omap_arch_initcall(omap4_sram_init);

/* Steal one page physical memory for barrier implementation */
int __init omap_barrier_reserve_memblock(void)
{

	size = ALIGN(PAGE_SIZE, SZ_1M);
	paddr = arm_memblock_steal(size, SZ_1M);

	return 0;
}

void __init omap_barriers_init(void)
{
	struct map_desc dram_io_desc[1];

	dram_io_desc[0].virtual = OMAP4_DRAM_BARRIER_VA;
	dram_io_desc[0].pfn = __phys_to_pfn(paddr);
	dram_io_desc[0].length = size;
	dram_io_desc[0].type = MT_MEMORY_RW_SO;
	iotable_init(dram_io_desc, ARRAY_SIZE(dram_io_desc));
	dram_sync = (void __iomem *) dram_io_desc[0].virtual;

	pr_info("OMAP4: Map 0x%08llx to 0x%08lx for dram barrier\n",
		(long long) paddr, dram_io_desc[0].virtual);

}
#else
void __init omap_barriers_init(void)
{}
#endif

void gic_dist_disable(void)
{
	if (gic_dist_base_addr)
		writel_relaxed(0x0, gic_dist_base_addr + GIC_DIST_CTRL);
}

void gic_dist_enable(void)
{
	if (gic_dist_base_addr)
		writel_relaxed(0x1, gic_dist_base_addr + GIC_DIST_CTRL);
}

bool gic_dist_disabled(void)
{
	return !(readl_relaxed(gic_dist_base_addr + GIC_DIST_CTRL) & 0x1);
}

void gic_timer_retrigger(void)
{
	u32 twd_int = readl_relaxed(twd_base + TWD_TIMER_INTSTAT);
	u32 gic_int = readl_relaxed(gic_dist_base_addr + GIC_DIST_PENDING_SET);
	u32 twd_ctrl = readl_relaxed(twd_base + TWD_TIMER_CONTROL);

	if (twd_int && !(gic_int & BIT(IRQ_LOCALTIMER))) {
		/*
		 * The local timer interrupt got lost while the distributor was
		 * disabled.  Ack the pending interrupt, and retrigger it.
		 */
		pr_warn("%s: lost localtimer interrupt\n", __func__);
		writel_relaxed(1, twd_base + TWD_TIMER_INTSTAT);
		if (!(twd_ctrl & TWD_TIMER_CONTROL_PERIODIC)) {
			writel_relaxed(1, twd_base + TWD_TIMER_COUNTER);
			twd_ctrl |= TWD_TIMER_CONTROL_ENABLE;
			writel_relaxed(twd_ctrl, twd_base + TWD_TIMER_CONTROL);
		}
	}
}

#ifdef CONFIG_CACHE_L2X0

void __iomem *omap4_get_l2cache_base(void)
{
	return l2cache_base;
}

void omap4_l2c310_write_sec(unsigned long val, unsigned reg)
{
	unsigned smc_op;

	switch (reg) {
	case L2X0_CTRL:
		smc_op = OMAP4_MON_L2X0_CTRL_INDEX;
		break;

	case L2X0_AUX_CTRL:
		smc_op = OMAP4_MON_L2X0_AUXCTRL_INDEX;
		break;

	case L2X0_DEBUG_CTRL:
		smc_op = OMAP4_MON_L2X0_DBG_CTRL_INDEX;
		break;

	case L310_PREFETCH_CTRL:
		smc_op = OMAP4_MON_L2X0_PREFETCH_INDEX;
		break;

	case L310_POWER_CTRL:
		pr_info_once("OMAP L2C310: ROM does not support power control setting\n");
		return;

	default:
		WARN_ONCE(1, "OMAP L2C310: ignoring write to reg 0x%x\n", reg);
		return;
	}

	omap_smc1(smc_op, val);
}

int __init omap_l2_cache_init(void)
{
	/* Static mapping, never released */
	l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K);
	if (WARN_ON(!l2cache_base))
		return -ENOMEM;
	return 0;
}
#endif

void __iomem *omap4_get_sar_ram_base(void)
{
	return sar_ram_base;
}

/*
 * SAR RAM used to save and restore the HW
 * context in low power modes
 */
static int __init omap4_sar_ram_init(void)
{
	unsigned long sar_base;

	/*
	 * To avoid code running on other OMAPs in
	 * multi-omap builds
	 */
	if (cpu_is_omap44xx())
		sar_base = OMAP44XX_SAR_RAM_BASE;
	else if (soc_is_omap54xx())
		sar_base = OMAP54XX_SAR_RAM_BASE;
	else
		return -ENOMEM;

	/* Static mapping, never released */
	sar_ram_base = ioremap(sar_base, SZ_16K);
	if (WARN_ON(!sar_ram_base))
		return -ENOMEM;

	return 0;
}
omap_early_initcall(omap4_sar_ram_init);

static const struct of_device_id gic_match[] = {
	{ .compatible = "arm,cortex-a9-gic", },
	{ .compatible = "arm,cortex-a15-gic", },
	{ },
};

static struct device_node *gic_node;

unsigned int omap4_xlate_irq(unsigned int hwirq)
{
	struct of_phandle_args irq_data;
	unsigned int irq;

	if (!gic_node)
		gic_node = of_find_matching_node(NULL, gic_match);

	if (WARN_ON(!gic_node))
		return hwirq;

	irq_data.np = gic_node;
	irq_data.args_count = 3;
	irq_data.args[0] = 0;
	irq_data.args[1] = hwirq - OMAP44XX_IRQ_GIC_START;
	irq_data.args[2] = IRQ_TYPE_LEVEL_HIGH;

	irq = irq_create_of_mapping(&irq_data);
	if (WARN_ON(!irq))
		irq = hwirq;

	return irq;
}

void __init omap_gic_of_init(void)
{
	struct device_node *np;

	/* Extract GIC distributor and TWD bases for OMAP4460 ROM Errata WA */
	if (!cpu_is_omap446x())
		goto skip_errata_init;

	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic");
	gic_dist_base_addr = of_iomap(np, 0);
	WARN_ON(!gic_dist_base_addr);

	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-twd-timer");
	twd_base = of_iomap(np, 0);
	WARN_ON(!twd_base);

skip_errata_init:
	omap_wakeupgen_init();
#ifdef CONFIG_IRQ_CROSSBAR
	irqcrossbar_init();
#endif
	irqchip_init();
}
Commit	Line	Data
fbc9be10 SS	1	/*
	2	* OMAP4 specific common source file.
	3	*
	4	* Copyright (C) 2010 Texas Instruments, Inc.
	5	* Author:
	6	* Santosh Shilimkar <santosh.shilimkar@ti.com>
	7	*
	8	*
	9	* This program is free software,you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/init.h>
	16	#include <linux/io.h>
cd8ce159	17	#include <linux/irq.h>
0529e315	18	#include <linux/irqchip.h>
fbc9be10	19	#include <linux/platform_device.h>
137d105d	20	#include <linux/memblock.h>
7d7e1eba TL	21	#include <linux/of_irq.h>
	22	#include <linux/of_platform.h>
	23	#include <linux/export.h>
520f7bd7	24	#include <linux/irqchip/arm-gic.h>
5c61e619	25	#include <linux/irqchip/irq-crossbar.h>
fd1c0786	26	#include <linux/of_address.h>
7b6d864b	27	#include <linux/reboot.h>
1306c08a	28	#include <linux/genalloc.h>
fbc9be10	29
fbc9be10	30	#include <asm/hardware/cache-l2x0.h>
137d105d	31	#include <asm/mach/map.h>
716a3dc2	32	#include <asm/memblock.h>
cd8ce159	33	#include <asm/smp_twd.h>
fbc9be10	34
732231a7	35	#include "omap-wakeupgen.h"
dbc04161	36	#include "soc.h"
b6a4226c	37	#include "iomap.h"
4e65331c	38	#include "common.h"
2f334a38	39	#include "prminst44xx.h"
d9a16f9a	40	#include "prcm_mpu44xx.h"
501f0c75	41	#include "omap4-sar-layout.h"
f7a9b8a1	42	#include "omap-secure.h"
bb772094	43	#include "sram.h"
fbc9be10 SS	44
fbc9be10 SS	45	#ifdef CONFIG_CACHE_L2X0
02afe8a7	46	static void __iomem *l2cache_base;
fbc9be10 SS	47	#endif
fbc9be10 SS	48
501f0c75	49	static void __iomem *sar_ram_base;
ff999b8a	50	static void __iomem *gic_dist_base_addr;
cd8ce159 CC	51	static void __iomem *twd_base;
	52
	53	#define IRQ_LOCALTIMER 29
501f0c75	54
137d105d SS	55	#ifdef CONFIG_OMAP4_ERRATA_I688
	56	/* Used to implement memory barrier on DRAM path */
	57	#define OMAP4_DRAM_BARRIER_VA 0xfe600000
	58
	59	void __iomem dram_sync, sram_sync;
	60
2ec1fc4e SS	61	static phys_addr_t paddr;
	62	static u32 size;
	63
137d105d SS	64	void omap_bus_sync(void)
	65	{
	66	if (dram_sync && sram_sync) {
	67	writel_relaxed(readl_relaxed(dram_sync), dram_sync);
	68	writel_relaxed(readl_relaxed(sram_sync), sram_sync);
	69	isb();
	70	}
	71	}
cc4ad907	72	EXPORT_SYMBOL(omap_bus_sync);
137d105d	73
1306c08a RN	74	static int __init omap4_sram_init(void)
	75	{
	76	struct device_node *np;
	77	struct gen_pool *sram_pool;
	78
	79	np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu");
	80	if (!np)
	81	pr_warn("%s:Unable to allocate sram needed to handle errata I688\n",
	82	__func__);
	83	sram_pool = of_get_named_gen_pool(np, "sram", 0);
	84	if (!sram_pool)
	85	pr_warn("%s:Unable to get sram pool needed to handle errata I688\n",
	86	__func__);
	87	else
	88	sram_sync = (void *)gen_pool_alloc(sram_pool, PAGE_SIZE);
	89
	90	return 0;
	91	}
	92	omap_arch_initcall(omap4_sram_init);
	93
2ec1fc4e SS	94	/* Steal one page physical memory for barrier implementation */
2ec1fc4e SS	95	int __init omap_barrier_reserve_memblock(void)
137d105d	96	{
137d105d SS	97
137d105d SS	98	size = ALIGN(PAGE_SIZE, SZ_1M);
716a3dc2 RK	99	paddr = arm_memblock_steal(size, SZ_1M);
716a3dc2 RK	100
2ec1fc4e SS	101	return 0;
	102	}
	103
	104	void __init omap_barriers_init(void)
	105	{
	106	struct map_desc dram_io_desc[1];
	107
137d105d SS	108	dram_io_desc[0].virtual = OMAP4_DRAM_BARRIER_VA;
	109	dram_io_desc[0].pfn = __phys_to_pfn(paddr);
	110	dram_io_desc[0].length = size;
2e2c9de2	111	dram_io_desc[0].type = MT_MEMORY_RW_SO;
137d105d SS	112	iotable_init(dram_io_desc, ARRAY_SIZE(dram_io_desc));
137d105d SS	113	dram_sync = (void __iomem *) dram_io_desc[0].virtual;
137d105d SS	114
	115	pr_info("OMAP4: Map 0x%08llx to 0x%08lx for dram barrier\n",
	116	(long long) paddr, dram_io_desc[0].virtual);
	117
137d105d	118	}
2ec1fc4e SS	119	#else
	120	void __init omap_barriers_init(void)
	121	{}
137d105d SS	122	#endif
137d105d SS	123
ff999b8a SS	124	void gic_dist_disable(void)
	125	{
	126	if (gic_dist_base_addr)
edfaf05c	127	writel_relaxed(0x0, gic_dist_base_addr + GIC_DIST_CTRL);
ff999b8a SS	128	}
ff999b8a SS	129
74ed7bdc SG	130	void gic_dist_enable(void)
	131	{
	132	if (gic_dist_base_addr)
edfaf05c	133	writel_relaxed(0x1, gic_dist_base_addr + GIC_DIST_CTRL);
74ed7bdc SG	134	}
74ed7bdc SG	135
cd8ce159 CC	136	bool gic_dist_disabled(void)
cd8ce159 CC	137	{
edfaf05c	138	return !(readl_relaxed(gic_dist_base_addr + GIC_DIST_CTRL) & 0x1);
cd8ce159 CC	139	}
	140
	141	void gic_timer_retrigger(void)
	142	{
edfaf05c VK	143	u32 twd_int = readl_relaxed(twd_base + TWD_TIMER_INTSTAT);
	144	u32 gic_int = readl_relaxed(gic_dist_base_addr + GIC_DIST_PENDING_SET);
	145	u32 twd_ctrl = readl_relaxed(twd_base + TWD_TIMER_CONTROL);
cd8ce159 CC	146
	147	if (twd_int && !(gic_int & BIT(IRQ_LOCALTIMER))) {
	148	/*
	149	* The local timer interrupt got lost while the distributor was
	150	* disabled. Ack the pending interrupt, and retrigger it.
	151	*/
	152	pr_warn("%s: lost localtimer interrupt\n", __func__);
edfaf05c	153	writel_relaxed(1, twd_base + TWD_TIMER_INTSTAT);
cd8ce159	154	if (!(twd_ctrl & TWD_TIMER_CONTROL_PERIODIC)) {
edfaf05c	155	writel_relaxed(1, twd_base + TWD_TIMER_COUNTER);
cd8ce159	156	twd_ctrl \|= TWD_TIMER_CONTROL_ENABLE;
edfaf05c	157	writel_relaxed(twd_ctrl, twd_base + TWD_TIMER_CONTROL);
cd8ce159 CC	158	}
	159	}
	160	}
	161
fbc9be10	162	#ifdef CONFIG_CACHE_L2X0
4e803c40	163
02afe8a7 SS	164	void __iomem *omap4_get_l2cache_base(void)
	165	{
	166	return l2cache_base;
	167	}
	168
944e9df1	169	void omap4_l2c310_write_sec(unsigned long val, unsigned reg)
4e803c40	170	{
36827edd	171	unsigned smc_op;
4e803c40	172
36827edd RK	173	switch (reg) {
	174	case L2X0_CTRL:
	175	smc_op = OMAP4_MON_L2X0_CTRL_INDEX;
	176	break;
	177
	178	case L2X0_AUX_CTRL:
	179	smc_op = OMAP4_MON_L2X0_AUXCTRL_INDEX;
	180	break;
	181
	182	case L2X0_DEBUG_CTRL:
	183	smc_op = OMAP4_MON_L2X0_DBG_CTRL_INDEX;
	184	break;
	185
	186	case L310_PREFETCH_CTRL:
	187	smc_op = OMAP4_MON_L2X0_PREFETCH_INDEX;
	188	break;
	189
ba394f0b SN	190	case L310_POWER_CTRL:
	191	pr_info_once("OMAP L2C310: ROM does not support power control setting\n");
	192	return;
	193
36827edd RK	194	default:
	195	WARN_ONCE(1, "OMAP L2C310: ignoring write to reg 0x%x\n", reg);
	196	return;
	197	}
	198
	199	omap_smc1(smc_op, val);
4bdb1577 SS	200	}
4bdb1577 SS	201
b39b14e6	202	int __init omap_l2_cache_init(void)
fbc9be10	203	{
fbc9be10 SS	204	/* Static mapping, never released */
fbc9be10 SS	205	l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K);
0db1803e SS	206	if (WARN_ON(!l2cache_base))
0db1803e SS	207	return -ENOMEM;
fbc9be10 SS	208	return 0;
fbc9be10 SS	209	}
fbc9be10	210	#endif
501f0c75 SS	211
	212	void __iomem *omap4_get_sar_ram_base(void)
	213	{
	214	return sar_ram_base;
	215	}
	216
	217	/*
	218	* SAR RAM used to save and restore the HW
	219	* context in low power modes
	220	*/
	221	static int __init omap4_sar_ram_init(void)
	222	{
da0e02a1 SS	223	unsigned long sar_base;
da0e02a1 SS	224
501f0c75 SS	225	/*
	226	* To avoid code running on other OMAPs in
	227	* multi-omap builds
	228	*/
da0e02a1 SS	229	if (cpu_is_omap44xx())
	230	sar_base = OMAP44XX_SAR_RAM_BASE;
	231	else if (soc_is_omap54xx())
	232	sar_base = OMAP54XX_SAR_RAM_BASE;
	233	else
501f0c75 SS	234	return -ENOMEM;
	235
	236	/* Static mapping, never released */
da0e02a1	237	sar_ram_base = ioremap(sar_base, SZ_16K);
501f0c75 SS	238	if (WARN_ON(!sar_ram_base))
	239	return -ENOMEM;
	240
	241	return 0;
	242	}
b76c8b19	243	omap_early_initcall(omap4_sar_ram_init);
1ee47b0a	244
444d2d33	245	static const struct of_device_id gic_match[] = {
0fb22a8f MZ	246	{ .compatible = "arm,cortex-a9-gic", },
	247	{ .compatible = "arm,cortex-a15-gic", },
	248	{ },
	249	};
	250
	251	static struct device_node *gic_node;
	252
	253	unsigned int omap4_xlate_irq(unsigned int hwirq)
	254	{
	255	struct of_phandle_args irq_data;
	256	unsigned int irq;
	257
	258	if (!gic_node)
	259	gic_node = of_find_matching_node(NULL, gic_match);
	260
	261	if (WARN_ON(!gic_node))
	262	return hwirq;
	263
	264	irq_data.np = gic_node;
	265	irq_data.args_count = 3;
	266	irq_data.args[0] = 0;
	267	irq_data.args[1] = hwirq - OMAP44XX_IRQ_GIC_START;
	268	irq_data.args[2] = IRQ_TYPE_LEVEL_HIGH;
	269
	270	irq = irq_create_of_mapping(&irq_data);
	271	if (WARN_ON(!irq))
	272	irq = hwirq;
	273
	274	return irq;
	275	}
	276
c4082d49 S	277	void __init omap_gic_of_init(void)
c4082d49 S	278	{
fd1c0786 SS	279	struct device_node *np;
	280
	281	/* Extract GIC distributor and TWD bases for OMAP4460 ROM Errata WA */
	282	if (!cpu_is_omap446x())
	283	goto skip_errata_init;
	284
	285	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic");
	286	gic_dist_base_addr = of_iomap(np, 0);
	287	WARN_ON(!gic_dist_base_addr);
	288
	289	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-twd-timer");
	290	twd_base = of_iomap(np, 0);
	291	WARN_ON(!twd_base);
	292
	293	skip_errata_init:
c4082d49	294	omap_wakeupgen_init();
5c61e619 S	295	#ifdef CONFIG_IRQ_CROSSBAR
	296	irqcrossbar_init();
	297	#endif
0529e315	298	irqchip_init();
c4082d49	299	}