[linux-block.git] / arch / arm / mach-omap2 / sram.c

/*
 *
 * OMAP SRAM detection and management
 *
 * Copyright (C) 2005 Nokia Corporation
 * Written by Tony Lindgren <tony@atomide.com>
 *
 * Copyright (C) 2009-2012 Texas Instruments
 * Added OMAP4/5 support - 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>

#include <asm/fncpy.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>

#include <asm/mach/map.h>

#include "soc.h"
#include "iomap.h"
#include "prm2xxx_3xxx.h"
#include "sdrc.h"
#include "sram.h"

#define OMAP2_SRAM_PUB_PA	(OMAP2_SRAM_PA + 0xf800)
#define OMAP3_SRAM_PUB_PA       (OMAP3_SRAM_PA + 0x8000)

#define SRAM_BOOTLOADER_SZ	0x00

#define OMAP24XX_VA_REQINFOPERM0	OMAP2_L3_IO_ADDRESS(0x68005048)
#define OMAP24XX_VA_READPERM0		OMAP2_L3_IO_ADDRESS(0x68005050)
#define OMAP24XX_VA_WRITEPERM0		OMAP2_L3_IO_ADDRESS(0x68005058)

#define OMAP34XX_VA_REQINFOPERM0	OMAP2_L3_IO_ADDRESS(0x68012848)
#define OMAP34XX_VA_READPERM0		OMAP2_L3_IO_ADDRESS(0x68012850)
#define OMAP34XX_VA_WRITEPERM0		OMAP2_L3_IO_ADDRESS(0x68012858)
#define OMAP34XX_VA_ADDR_MATCH2		OMAP2_L3_IO_ADDRESS(0x68012880)
#define OMAP34XX_VA_SMS_RG_ATT0		OMAP2_L3_IO_ADDRESS(0x6C000048)

#define GP_DEVICE		0x300

#define ROUND_DOWN(value,boundary)	((value) & (~((boundary)-1)))

static unsigned long omap_sram_start;
static unsigned long omap_sram_skip;
static unsigned long omap_sram_size;

/*
 * Depending on the target RAMFS firewall setup, the public usable amount of
 * SRAM varies.  The default accessible size for all device types is 2k. A GP
 * device allows ARM11 but not other initiators for full size. This
 * functionality seems ok until some nice security API happens.
 */
static int is_sram_locked(void)
{
	if (OMAP2_DEVICE_TYPE_GP == omap_type()) {
		/* RAMFW: R/W access to all initiators for all qualifier sets */
		if (cpu_is_omap242x()) {
			writel_relaxed(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
			writel_relaxed(0xCFDE, OMAP24XX_VA_READPERM0);  /* all i-read */
			writel_relaxed(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
		}
		if (cpu_is_omap34xx()) {
			writel_relaxed(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
			writel_relaxed(0xFFFF, OMAP34XX_VA_READPERM0);  /* all i-read */
			writel_relaxed(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
			writel_relaxed(0x0, OMAP34XX_VA_ADDR_MATCH2);
			writel_relaxed(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
		}
		return 0;
	} else
		return 1; /* assume locked with no PPA or security driver */
}

/*
 * The amount of SRAM depends on the core type.
 * Note that we cannot try to test for SRAM here because writes
 * to secure SRAM will hang the system. Also the SRAM is not
 * yet mapped at this point.
 */
static void __init omap_detect_sram(void)
{
	omap_sram_skip = SRAM_BOOTLOADER_SZ;
	if (is_sram_locked()) {
		if (cpu_is_omap34xx()) {
			omap_sram_start = OMAP3_SRAM_PUB_PA;
			if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) ||
			    (omap_type() == OMAP2_DEVICE_TYPE_SEC)) {
				omap_sram_size = 0x7000; /* 28K */
				omap_sram_skip += SZ_16K;
			} else {
				omap_sram_size = 0x8000; /* 32K */
			}
		} else {
			omap_sram_start = OMAP2_SRAM_PUB_PA;
			omap_sram_size = 0x800; /* 2K */
		}
	} else {
		if (cpu_is_omap34xx()) {
			omap_sram_start = OMAP3_SRAM_PA;
			omap_sram_size = 0x10000; /* 64K */
		} else {
			omap_sram_start = OMAP2_SRAM_PA;
			if (cpu_is_omap242x())
				omap_sram_size = 0xa0000; /* 640K */
			else if (cpu_is_omap243x())
				omap_sram_size = 0x10000; /* 64K */
		}
	}
}

/*
 * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
 */
static void __init omap2_map_sram(void)
{
	int cached = 1;

	if (cpu_is_omap34xx()) {
		/*
		 * SRAM must be marked as non-cached on OMAP3 since the
		 * CORE DPLL M2 divider change code (in SRAM) runs with the
		 * SDRAM controller disabled, and if it is marked cached,
		 * the ARM may attempt to write cache lines back to SDRAM
		 * which will cause the system to hang.
		 */
		cached = 0;
	}

	omap_map_sram(omap_sram_start, omap_sram_size,
			omap_sram_skip, cached);
}

static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
			      u32 base_cs, u32 force_unlock);

void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
		   u32 base_cs, u32 force_unlock)
{
	BUG_ON(!_omap2_sram_ddr_init);
	_omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
			     base_cs, force_unlock);
}

static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
					  u32 mem_type);

void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
{
	BUG_ON(!_omap2_sram_reprogram_sdrc);
	_omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
}

static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);

u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
{
	BUG_ON(!_omap2_set_prcm);
	return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
}

#ifdef CONFIG_SOC_OMAP2420
static int __init omap242x_sram_init(void)
{
	_omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
					omap242x_sram_ddr_init_sz);

	_omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
					    omap242x_sram_reprogram_sdrc_sz);

	_omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
					 omap242x_sram_set_prcm_sz);

	return 0;
}
#else
static inline int omap242x_sram_init(void)
{
	return 0;
}
#endif

#ifdef CONFIG_SOC_OMAP2430
static int __init omap243x_sram_init(void)
{
	_omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
					omap243x_sram_ddr_init_sz);

	_omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
					    omap243x_sram_reprogram_sdrc_sz);

	_omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
					 omap243x_sram_set_prcm_sz);

	return 0;
}
#else
static inline int omap243x_sram_init(void)
{
	return 0;
}
#endif

#ifdef CONFIG_ARCH_OMAP3

void omap3_sram_restore_context(void)
{
	omap_sram_reset();

	omap_push_sram_idle();
}

static inline int omap34xx_sram_init(void)
{
	omap3_sram_restore_context();
	return 0;
}
#else
static inline int omap34xx_sram_init(void)
{
	return 0;
}
#endif /* CONFIG_ARCH_OMAP3 */

int __init omap_sram_init(void)
{
	omap_detect_sram();
	omap2_map_sram();

	if (cpu_is_omap242x())
		omap242x_sram_init();
	else if (cpu_is_omap2430())
		omap243x_sram_init();
	else if (cpu_is_omap34xx())
		omap34xx_sram_init();

	return 0;
}
Commit	Line	Data
bb772094 TL	1	/*
	2	*
	3	* OMAP SRAM detection and management
	4	*
	5	* Copyright (C) 2005 Nokia Corporation
	6	* Written by Tony Lindgren <tony@atomide.com>
	7	*
	8	* Copyright (C) 2009-2012 Texas Instruments
	9	* Added OMAP4/5 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/kernel.h>
	18	#include <linux/init.h>
	19	#include <linux/io.h>
	20
	21	#include <asm/fncpy.h>
	22	#include <asm/tlb.h>
	23	#include <asm/cacheflush.h>
	24
	25	#include <asm/mach/map.h>
	26
	27	#include "soc.h"
	28	#include "iomap.h"
	29	#include "prm2xxx_3xxx.h"
	30	#include "sdrc.h"
	31	#include "sram.h"
	32
	33	#define OMAP2_SRAM_PUB_PA (OMAP2_SRAM_PA + 0xf800)
	34	#define OMAP3_SRAM_PUB_PA (OMAP3_SRAM_PA + 0x8000)
bb772094 TL	35
	36	#define SRAM_BOOTLOADER_SZ 0x00
	37
	38	#define OMAP24XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68005048)
	39	#define OMAP24XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68005050)
	40	#define OMAP24XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68005058)
	41
	42	#define OMAP34XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68012848)
	43	#define OMAP34XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68012850)
	44	#define OMAP34XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68012858)
	45	#define OMAP34XX_VA_ADDR_MATCH2 OMAP2_L3_IO_ADDRESS(0x68012880)
	46	#define OMAP34XX_VA_SMS_RG_ATT0 OMAP2_L3_IO_ADDRESS(0x6C000048)
	47
	48	#define GP_DEVICE 0x300
	49
	50	#define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1)))
	51
	52	static unsigned long omap_sram_start;
	53	static unsigned long omap_sram_skip;
	54	static unsigned long omap_sram_size;
	55
	56	/*
	57	* Depending on the target RAMFS firewall setup, the public usable amount of
	58	* SRAM varies. The default accessible size for all device types is 2k. A GP
	59	* device allows ARM11 but not other initiators for full size. This
	60	* functionality seems ok until some nice security API happens.
	61	*/
	62	static int is_sram_locked(void)
	63	{
	64	if (OMAP2_DEVICE_TYPE_GP == omap_type()) {
	65	/* RAMFW: R/W access to all initiators for all qualifier sets */
	66	if (cpu_is_omap242x()) {
edfaf05c VK	67	writel_relaxed(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
	68	writel_relaxed(0xCFDE, OMAP24XX_VA_READPERM0); /* all i-read */
	69	writel_relaxed(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
bb772094 TL	70	}
bb772094 TL	71	if (cpu_is_omap34xx()) {
edfaf05c VK	72	writel_relaxed(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
	73	writel_relaxed(0xFFFF, OMAP34XX_VA_READPERM0); /* all i-read */
	74	writel_relaxed(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
	75	writel_relaxed(0x0, OMAP34XX_VA_ADDR_MATCH2);
	76	writel_relaxed(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
bb772094 TL	77	}
	78	return 0;
	79	} else
	80	return 1; /* assume locked with no PPA or security driver */
	81	}
	82
	83	/*
	84	* The amount of SRAM depends on the core type.
	85	* Note that we cannot try to test for SRAM here because writes
	86	* to secure SRAM will hang the system. Also the SRAM is not
	87	* yet mapped at this point.
	88	*/
	89	static void __init omap_detect_sram(void)
	90	{
	91	omap_sram_skip = SRAM_BOOTLOADER_SZ;
	92	if (is_sram_locked()) {
	93	if (cpu_is_omap34xx()) {
	94	omap_sram_start = OMAP3_SRAM_PUB_PA;
	95	if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) \|\|
	96	(omap_type() == OMAP2_DEVICE_TYPE_SEC)) {
	97	omap_sram_size = 0x7000; /* 28K */
	98	omap_sram_skip += SZ_16K;
	99	} else {
	100	omap_sram_size = 0x8000; /* 32K */
	101	}
bb772094 TL	102	} else {
	103	omap_sram_start = OMAP2_SRAM_PUB_PA;
	104	omap_sram_size = 0x800; /* 2K */
	105	}
	106	} else {
8b9a2810	107	if (cpu_is_omap34xx()) {
bb772094 TL	108	omap_sram_start = OMAP3_SRAM_PA;
bb772094 TL	109	omap_sram_size = 0x10000; /* 64K */
bb772094 TL	110	} else {
	111	omap_sram_start = OMAP2_SRAM_PA;
	112	if (cpu_is_omap242x())
	113	omap_sram_size = 0xa0000; /* 640K */
	114	else if (cpu_is_omap243x())
	115	omap_sram_size = 0x10000; /* 64K */
	116	}
	117	}
	118	}
	119
	120	/*
	121	* Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
	122	*/
	123	static void __init omap2_map_sram(void)
	124	{
	125	int cached = 1;
	126
bb772094 TL	127	if (cpu_is_omap34xx()) {
	128	/*
	129	* SRAM must be marked as non-cached on OMAP3 since the
	130	* CORE DPLL M2 divider change code (in SRAM) runs with the
	131	* SDRAM controller disabled, and if it is marked cached,
	132	* the ARM may attempt to write cache lines back to SDRAM
	133	* which will cause the system to hang.
	134	*/
	135	cached = 0;
	136	}
	137
	138	omap_map_sram(omap_sram_start, omap_sram_size,
	139	omap_sram_skip, cached);
	140	}
	141
	142	static void (_omap2_sram_ddr_init)(u32 slow_dll_ctrl, u32 fast_dll_ctrl,
	143	u32 base_cs, u32 force_unlock);
	144
	145	void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
	146	u32 base_cs, u32 force_unlock)
	147	{
	148	BUG_ON(!_omap2_sram_ddr_init);
	149	_omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
	150	base_cs, force_unlock);
	151	}
	152
	153	static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
	154	u32 mem_type);
	155
	156	void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
	157	{
	158	BUG_ON(!_omap2_sram_reprogram_sdrc);
	159	_omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
	160	}
	161
	162	static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
	163
	164	u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
	165	{
	166	BUG_ON(!_omap2_set_prcm);
	167	return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
	168	}
	169
	170	#ifdef CONFIG_SOC_OMAP2420
	171	static int __init omap242x_sram_init(void)
	172	{
	173	_omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
	174	omap242x_sram_ddr_init_sz);
	175
	176	_omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
	177	omap242x_sram_reprogram_sdrc_sz);
	178
	179	_omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
	180	omap242x_sram_set_prcm_sz);
	181
	182	return 0;
	183	}
	184	#else
	185	static inline int omap242x_sram_init(void)
	186	{
	187	return 0;
	188	}
	189	#endif
	190
191	#ifdef CONFIG_SOC_OMAP2430
192	static int __init omap243x_sram_init(void)
193	{
194	_omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
195	omap243x_sram_ddr_init_sz);
196
197	_omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
198	omap243x_sram_reprogram_sdrc_sz);
199
200	_omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
201	omap243x_sram_set_prcm_sz);
202
203	return 0;
204	}
205	#else
206	static inline int omap243x_sram_init(void)
207	{
208	return 0;
209	}
210	#endif
211
212	#ifdef CONFIG_ARCH_OMAP3
213
bb772094 TL	214	void omap3_sram_restore_context(void)
	215	{
	216	omap_sram_reset();
	217
bb772094 TL	218	omap_push_sram_idle();
	219	}
	220
	221	static inline int omap34xx_sram_init(void)
	222	{
	223	omap3_sram_restore_context();
	224	return 0;
	225	}
	226	#else
	227	static inline int omap34xx_sram_init(void)
	228	{
	229	return 0;
	230	}
	231	#endif /* CONFIG_ARCH_OMAP3 */
	232
bb772094 TL	233	int __init omap_sram_init(void)
	234	{
	235	omap_detect_sram();
	236	omap2_map_sram();
	237
	238	if (cpu_is_omap242x())
	239	omap242x_sram_init();
	240	else if (cpu_is_omap2430())
	241	omap243x_sram_init();
bb772094 TL	242	else if (cpu_is_omap34xx())
	243	omap34xx_sram_init();
	244
	245	return 0;
	246	}