[linux-2.6-block.git] / arch / arm / mm / cache-tauros2.c

/*
 * arch/arm/mm/cache-tauros2.c - Tauros2 L2 cache controller support
 *
 * Copyright (C) 2008 Marvell Semiconductor
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 *
 * References:
 * - PJ1 CPU Core Datasheet,
 *   Document ID MV-S104837-01, Rev 0.7, January 24 2008.
 * - PJ4 CPU Core Datasheet,
 *   Document ID MV-S105190-00, Rev 0.7, March 14 2008.
 */

#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm/cacheflush.h>
#include <asm/cp15.h>
#include <asm/cputype.h>
#include <asm/hardware/cache-tauros2.h>


/*
 * When Tauros2 is used on a CPU that supports the v7 hierarchical
 * cache operations, the cache handling code in proc-v7.S takes care
 * of everything, including handling DMA coherency.
 *
 * So, we only need to register outer cache operations here if we're
 * being used on a pre-v7 CPU, and we only need to build support for
 * outer cache operations into the kernel image if the kernel has been
 * configured to support a pre-v7 CPU.
 */
#ifdef CONFIG_CPU_32v5
/*
 * Low-level cache maintenance operations.
 */
static inline void tauros2_clean_pa(unsigned long addr)
{
	__asm__("mcr p15, 1, %0, c7, c11, 3" : : "r" (addr));
}

static inline void tauros2_clean_inv_pa(unsigned long addr)
{
	__asm__("mcr p15, 1, %0, c7, c15, 3" : : "r" (addr));
}

static inline void tauros2_inv_pa(unsigned long addr)
{
	__asm__("mcr p15, 1, %0, c7, c7, 3" : : "r" (addr));
}


/*
 * Linux primitives.
 *
 * Note that the end addresses passed to Linux primitives are
 * noninclusive.
 */
#define CACHE_LINE_SIZE		32

static void tauros2_inv_range(unsigned long start, unsigned long end)
{
	/*
	 * Clean and invalidate partial first cache line.
	 */
	if (start & (CACHE_LINE_SIZE - 1)) {
		tauros2_clean_inv_pa(start & ~(CACHE_LINE_SIZE - 1));
		start = (start | (CACHE_LINE_SIZE - 1)) + 1;
	}

	/*
	 * Clean and invalidate partial last cache line.
	 */
	if (end & (CACHE_LINE_SIZE - 1)) {
		tauros2_clean_inv_pa(end & ~(CACHE_LINE_SIZE - 1));
		end &= ~(CACHE_LINE_SIZE - 1);
	}

	/*
	 * Invalidate all full cache lines between 'start' and 'end'.
	 */
	while (start < end) {
		tauros2_inv_pa(start);
		start += CACHE_LINE_SIZE;
	}

	dsb();
}

static void tauros2_clean_range(unsigned long start, unsigned long end)
{
	start &= ~(CACHE_LINE_SIZE - 1);
	while (start < end) {
		tauros2_clean_pa(start);
		start += CACHE_LINE_SIZE;
	}

	dsb();
}

static void tauros2_flush_range(unsigned long start, unsigned long end)
{
	start &= ~(CACHE_LINE_SIZE - 1);
	while (start < end) {
		tauros2_clean_inv_pa(start);
		start += CACHE_LINE_SIZE;
	}

	dsb();
}

static void tauros2_disable(void)
{
	__asm__ __volatile__ (
	"mcr	p15, 1, %0, c7, c11, 0 @L2 Cache Clean All\n\t"
	"mrc	p15, 0, %0, c1, c0, 0\n\t"
	"bic	%0, %0, #(1 << 26)\n\t"
	"mcr	p15, 0, %0, c1, c0, 0  @Disable L2 Cache\n\t"
	: : "r" (0x0));
}

static void tauros2_resume(void)
{
	__asm__ __volatile__ (
	"mcr	p15, 1, %0, c7, c7, 0 @L2 Cache Invalidate All\n\t"
	"mrc	p15, 0, %0, c1, c0, 0\n\t"
	"orr	%0, %0, #(1 << 26)\n\t"
	"mcr	p15, 0, %0, c1, c0, 0 @Enable L2 Cache\n\t"
	: : "r" (0x0));
}
#endif

static inline u32 __init read_extra_features(void)
{
	u32 u;

	__asm__("mrc p15, 1, %0, c15, c1, 0" : "=r" (u));

	return u;
}

static inline void __init write_extra_features(u32 u)
{
	__asm__("mcr p15, 1, %0, c15, c1, 0" : : "r" (u));
}

static inline int __init cpuid_scheme(void)
{
	return !!((processor_id & 0x000f0000) == 0x000f0000);
}

static inline u32 __init read_mmfr3(void)
{
	u32 mmfr3;

	__asm__("mrc p15, 0, %0, c0, c1, 7\n" : "=r" (mmfr3));

	return mmfr3;
}

static inline u32 __init read_actlr(void)
{
	u32 actlr;

	__asm__("mrc p15, 0, %0, c1, c0, 1\n" : "=r" (actlr));

	return actlr;
}

static inline void __init write_actlr(u32 actlr)
{
	__asm__("mcr p15, 0, %0, c1, c0, 1\n" : : "r" (actlr));
}

static void enable_extra_feature(unsigned int features)
{
	u32 u;

	u = read_extra_features();

	if (features & CACHE_TAUROS2_PREFETCH_ON)
		u &= ~0x01000000;
	else
		u |= 0x01000000;
	pr_info("Tauros2: %s L2 prefetch.\n",
			(features & CACHE_TAUROS2_PREFETCH_ON)
			? "Enabling" : "Disabling");

	if (features & CACHE_TAUROS2_LINEFILL_BURST8)
		u |= 0x00100000;
	else
		u &= ~0x00100000;
	pr_info("Tauros2: %s line fill burt8.\n",
			(features & CACHE_TAUROS2_LINEFILL_BURST8)
			? "Enabling" : "Disabling");

	write_extra_features(u);
}

static void __init tauros2_internal_init(unsigned int features)
{
	char *mode = NULL;

	enable_extra_feature(features);

#ifdef CONFIG_CPU_32v5
	if ((processor_id & 0xff0f0000) == 0x56050000) {
		u32 feat;

		/*
		 * v5 CPUs with Tauros2 have the L2 cache enable bit
		 * located in the CPU Extra Features register.
		 */
		feat = read_extra_features();
		if (!(feat & 0x00400000)) {
			pr_info("Tauros2: Enabling L2 cache.\n");
			write_extra_features(feat | 0x00400000);
		}

		mode = "ARMv5";
		outer_cache.inv_range = tauros2_inv_range;
		outer_cache.clean_range = tauros2_clean_range;
		outer_cache.flush_range = tauros2_flush_range;
		outer_cache.disable = tauros2_disable;
		outer_cache.resume = tauros2_resume;
	}
#endif

#ifdef CONFIG_CPU_32v7
	/*
	 * Check whether this CPU has support for the v7 hierarchical
	 * cache ops.  (PJ4 is in its v7 personality mode if the MMFR3
	 * register indicates support for the v7 hierarchical cache
	 * ops.)
	 *
	 * (Although strictly speaking there may exist CPUs that
	 * implement the v7 cache ops but are only ARMv6 CPUs (due to
	 * not complying with all of the other ARMv7 requirements),
	 * there are no real-life examples of Tauros2 being used on
	 * such CPUs as of yet.)
	 */
	if (cpuid_scheme() && (read_mmfr3() & 0xf) == 1) {
		u32 actlr;

		/*
		 * When Tauros2 is used in an ARMv7 system, the L2
		 * enable bit is located in the Auxiliary System Control
		 * Register (which is the only register allowed by the
		 * ARMv7 spec to contain fine-grained cache control bits).
		 */
		actlr = read_actlr();
		if (!(actlr & 0x00000002)) {
			pr_info("Tauros2: Enabling L2 cache.\n");
			write_actlr(actlr | 0x00000002);
		}

		mode = "ARMv7";
	}
#endif

	if (mode == NULL) {
		pr_crit("Tauros2: Unable to detect CPU mode.\n");
		return;
	}

	pr_info("Tauros2: L2 cache support initialised "
			 "in %s mode.\n", mode);
}

#ifdef CONFIG_OF
static const struct of_device_id tauros2_ids[] __initconst = {
	{ .compatible = "marvell,tauros2-cache"},
	{}
};
#endif

void __init tauros2_init(unsigned int features)
{
#ifdef CONFIG_OF
	struct device_node *node;
	int ret;
	unsigned int f;

	node = of_find_matching_node(NULL, tauros2_ids);
	if (!node) {
		pr_info("Not found marvell,tauros2-cache, disable it\n");
		return;
	}

	ret = of_property_read_u32(node, "marvell,tauros2-cache-features", &f);
	if (ret) {
		pr_info("Not found marvell,tauros-cache-features property, "
			"disable extra features\n");
		features = 0;
	} else
		features = f;
#endif
	tauros2_internal_init(features);
}
Commit	Line	Data
573a652f LB	1	/*
	2	* arch/arm/mm/cache-tauros2.c - Tauros2 L2 cache controller support
	3	*
	4	* Copyright (C) 2008 Marvell Semiconductor
	5	*
	6	* This file is licensed under the terms of the GNU General Public
	7	* License version 2. This program is licensed "as is" without any
	8	* warranty of any kind, whether express or implied.
	9	*
	10	* References:
	11	* - PJ1 CPU Core Datasheet,
	12	* Document ID MV-S104837-01, Rev 0.7, January 24 2008.
	13	* - PJ4 CPU Core Datasheet,
	14	* Document ID MV-S105190-00, Rev 0.7, March 14 2008.
	15	*/
	16
	17	#include <linux/init.h>
c2b7e05c CX	18	#include <linux/of.h>
c2b7e05c CX	19	#include <linux/of_address.h>
573a652f	20	#include <asm/cacheflush.h>
15d07dc9	21	#include <asm/cp15.h>
fa79b8d6	22	#include <asm/cputype.h>
573a652f LB	23	#include <asm/hardware/cache-tauros2.h>
	24
	25
	26	/*
	27	* When Tauros2 is used on a CPU that supports the v7 hierarchical
	28	* cache operations, the cache handling code in proc-v7.S takes care
	29	* of everything, including handling DMA coherency.
	30	*
	31	* So, we only need to register outer cache operations here if we're
	32	* being used on a pre-v7 CPU, and we only need to build support for
	33	* outer cache operations into the kernel image if the kernel has been
	34	* configured to support a pre-v7 CPU.
	35	*/
027f3f96	36	#ifdef CONFIG_CPU_32v5
573a652f LB	37	/*
	38	* Low-level cache maintenance operations.
	39	*/
	40	static inline void tauros2_clean_pa(unsigned long addr)
	41	{
	42	__asm__("mcr p15, 1, %0, c7, c11, 3" : : "r" (addr));
	43	}
	44
	45	static inline void tauros2_clean_inv_pa(unsigned long addr)
	46	{
	47	__asm__("mcr p15, 1, %0, c7, c15, 3" : : "r" (addr));
	48	}
	49
	50	static inline void tauros2_inv_pa(unsigned long addr)
	51	{
	52	__asm__("mcr p15, 1, %0, c7, c7, 3" : : "r" (addr));
	53	}
	54
	55
	56	/*
	57	* Linux primitives.
	58	*
	59	* Note that the end addresses passed to Linux primitives are
	60	* noninclusive.
	61	*/
	62	#define CACHE_LINE_SIZE 32
	63
	64	static void tauros2_inv_range(unsigned long start, unsigned long end)
	65	{
	66	/*
	67	* Clean and invalidate partial first cache line.
	68	*/
	69	if (start & (CACHE_LINE_SIZE - 1)) {
	70	tauros2_clean_inv_pa(start & ~(CACHE_LINE_SIZE - 1));
	71	start = (start \| (CACHE_LINE_SIZE - 1)) + 1;
	72	}
	73
	74	/*
	75	* Clean and invalidate partial last cache line.
	76	*/
	77	if (end & (CACHE_LINE_SIZE - 1)) {
	78	tauros2_clean_inv_pa(end & ~(CACHE_LINE_SIZE - 1));
	79	end &= ~(CACHE_LINE_SIZE - 1);
	80	}
	81
	82	/*
	83	* Invalidate all full cache lines between 'start' and 'end'.
	84	*/
	85	while (start < end) {
	86	tauros2_inv_pa(start);
	87	start += CACHE_LINE_SIZE;
	88	}
	89
	90	dsb();
	91	}
	92
	93	static void tauros2_clean_range(unsigned long start, unsigned long end)
	94	{
	95	start &= ~(CACHE_LINE_SIZE - 1);
	96	while (start < end) {
	97	tauros2_clean_pa(start);
	98	start += CACHE_LINE_SIZE;
	99	}
	100
101	dsb();
102	}
103
104	static void tauros2_flush_range(unsigned long start, unsigned long end)
105	{
106	start &= ~(CACHE_LINE_SIZE - 1);
107	while (start < end) {
108	tauros2_clean_inv_pa(start);
109	start += CACHE_LINE_SIZE;
110	}
111
112	dsb();
113	}
89326f76 CX	114
	115	static void tauros2_disable(void)
	116	{
	117	__asm__ __volatile__ (
	118	"mcr p15, 1, %0, c7, c11, 0 @L2 Cache Clean All\n\t"
	119	"mrc p15, 0, %0, c1, c0, 0\n\t"
	120	"bic %0, %0, #(1 << 26)\n\t"
	121	"mcr p15, 0, %0, c1, c0, 0 @Disable L2 Cache\n\t"
	122	: : "r" (0x0));
	123	}
	124
	125	static void tauros2_resume(void)
	126	{
	127	__asm__ __volatile__ (
	128	"mcr p15, 1, %0, c7, c7, 0 @L2 Cache Invalidate All\n\t"
	129	"mrc p15, 0, %0, c1, c0, 0\n\t"
	130	"orr %0, %0, #(1 << 26)\n\t"
	131	"mcr p15, 0, %0, c1, c0, 0 @Enable L2 Cache\n\t"
	132	: : "r" (0x0));
	133	}
573a652f LB	134	#endif
	135
	136	static inline u32 __init read_extra_features(void)
	137	{
	138	u32 u;
	139
	140	__asm__("mrc p15, 1, %0, c15, c1, 0" : "=r" (u));
	141
	142	return u;
	143	}
	144
	145	static inline void __init write_extra_features(u32 u)
	146	{
	147	__asm__("mcr p15, 1, %0, c15, c1, 0" : : "r" (u));
	148	}
	149
573a652f LB	150	static inline int __init cpuid_scheme(void)
573a652f LB	151	{
573a652f LB	152	return !!((processor_id & 0x000f0000) == 0x000f0000);
	153	}
	154
	155	static inline u32 __init read_mmfr3(void)
	156	{
	157	u32 mmfr3;
	158
	159	__asm__("mrc p15, 0, %0, c0, c1, 7\n" : "=r" (mmfr3));
	160
	161	return mmfr3;
	162	}
	163
	164	static inline u32 __init read_actlr(void)
	165	{
	166	u32 actlr;
	167
	168	__asm__("mrc p15, 0, %0, c1, c0, 1\n" : "=r" (actlr));
	169
	170	return actlr;
	171	}
	172
	173	static inline void __init write_actlr(u32 actlr)
	174	{
	175	__asm__("mcr p15, 0, %0, c1, c0, 1\n" : : "r" (actlr));
	176	}
	177
38f2e377 CX	178	static void enable_extra_feature(unsigned int features)
	179	{
	180	u32 u;
	181
	182	u = read_extra_features();
	183
	184	if (features & CACHE_TAUROS2_PREFETCH_ON)
	185	u &= ~0x01000000;
	186	else
	187	u \|= 0x01000000;
4ed89f22	188	pr_info("Tauros2: %s L2 prefetch.\n",
38f2e377 CX	189	(features & CACHE_TAUROS2_PREFETCH_ON)
	190	? "Enabling" : "Disabling");
	191
	192	if (features & CACHE_TAUROS2_LINEFILL_BURST8)
	193	u \|= 0x00100000;
	194	else
	195	u &= ~0x00100000;
4ed89f22	196	pr_info("Tauros2: %s line fill burt8.\n",
38f2e377 CX	197	(features & CACHE_TAUROS2_LINEFILL_BURST8)
	198	? "Enabling" : "Disabling");
	199
	200	write_extra_features(u);
	201	}
	202
c2b7e05c	203	static void __init tauros2_internal_init(unsigned int features)
573a652f	204	{
5967b546	205	char *mode = NULL;
573a652f	206
38f2e377	207	enable_extra_feature(features);
573a652f LB	208
	209	#ifdef CONFIG_CPU_32v5
	210	if ((processor_id & 0xff0f0000) == 0x56050000) {
	211	u32 feat;
	212
	213	/*
	214	* v5 CPUs with Tauros2 have the L2 cache enable bit
	215	* located in the CPU Extra Features register.
	216	*/
	217	feat = read_extra_features();
	218	if (!(feat & 0x00400000)) {
4ed89f22	219	pr_info("Tauros2: Enabling L2 cache.\n");
573a652f LB	220	write_extra_features(feat \| 0x00400000);
	221	}
	222
	223	mode = "ARMv5";
	224	outer_cache.inv_range = tauros2_inv_range;
573a652f LB	225	outer_cache.clean_range = tauros2_clean_range;
573a652f LB	226	outer_cache.flush_range = tauros2_flush_range;
89326f76 CX	227	outer_cache.disable = tauros2_disable;
89326f76 CX	228	outer_cache.resume = tauros2_resume;
573a652f LB	229	}
	230	#endif
	231
	232	#ifdef CONFIG_CPU_32v7
	233	/*
	234	* Check whether this CPU has support for the v7 hierarchical
	235	* cache ops. (PJ4 is in its v7 personality mode if the MMFR3
	236	* register indicates support for the v7 hierarchical cache
	237	* ops.)
	238	*
	239	* (Although strictly speaking there may exist CPUs that
	240	* implement the v7 cache ops but are only ARMv6 CPUs (due to
	241	* not complying with all of the other ARMv7 requirements),
	242	* there are no real-life examples of Tauros2 being used on
	243	* such CPUs as of yet.)
	244	*/
	245	if (cpuid_scheme() && (read_mmfr3() & 0xf) == 1) {
	246	u32 actlr;
	247
	248	/*
	249	* When Tauros2 is used in an ARMv7 system, the L2
	250	* enable bit is located in the Auxiliary System Control
	251	* Register (which is the only register allowed by the
	252	* ARMv7 spec to contain fine-grained cache control bits).
	253	*/
	254	actlr = read_actlr();
	255	if (!(actlr & 0x00000002)) {
4ed89f22	256	pr_info("Tauros2: Enabling L2 cache.\n");
573a652f LB	257	write_actlr(actlr \| 0x00000002);
	258	}
	259
	260	mode = "ARMv7";
	261	}
	262	#endif
	263
	264	if (mode == NULL) {
4ed89f22	265	pr_crit("Tauros2: Unable to detect CPU mode.\n");
573a652f LB	266	return;
	267	}
	268
4ed89f22	269	pr_info("Tauros2: L2 cache support initialised "
573a652f LB	270	"in %s mode.\n", mode);
573a652f LB	271	}
c2b7e05c CX	272
	273	#ifdef CONFIG_OF
	274	static const struct of_device_id tauros2_ids[] __initconst = {
	275	{ .compatible = "marvell,tauros2-cache"},
	276	{}
	277	};
	278	#endif
	279
	280	void __init tauros2_init(unsigned int features)
	281	{
	282	#ifdef CONFIG_OF
	283	struct device_node *node;
	284	int ret;
	285	unsigned int f;
	286
	287	node = of_find_matching_node(NULL, tauros2_ids);
	288	if (!node) {
	289	pr_info("Not found marvell,tauros2-cache, disable it\n");
	290	return;
	291	}
	292
	293	ret = of_property_read_u32(node, "marvell,tauros2-cache-features", &f);
	294	if (ret) {
	295	pr_info("Not found marvell,tauros-cache-features property, "
	296	"disable extra features\n");
	297	features = 0;
	298	} else
	299	features = f;
	300	#endif
	301	tauros2_internal_init(features);
	302	}