arch/arm/mm/cache-l2x0.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * arch/arm/mm/cache-l2x0.c - L210/L220 cache controller support
  *
  * Copyright (C) 2007 ARM Limited
  *
  * 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.
  *
  * 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/err.h>
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>

 #include <asm/cacheflush.h>
 #include <asm/hardware/cache-l2x0.h>

 #define CACHE_LINE_SIZE		32

 static void __iomem *l2x0_base;
 static DEFINE_SPINLOCK(l2x0_lock);
 static uint32_t l2x0_way_mask;	/* Bitmask of active ways */
 static uint32_t l2x0_size;

 struct l2x0_regs l2x0_saved_regs;

 struct l2x0_of_data {
 	void (*setup)(const struct device_node *, __u32 *, __u32 *);
 	void (*save)(void);
 	void (*resume)(void);
 };

 static inline void cache_wait_way(void __iomem *reg, unsigned long mask)
 {
 	/* wait for cache operation by line or way to complete */
 	while (readl_relaxed(reg) & mask)
 		cpu_relax();
 }

 #ifdef CONFIG_CACHE_PL310
 static inline void cache_wait(void __iomem *reg, unsigned long mask)
 {
 	/* cache operations by line are atomic on PL310 */
 }
 #else
 #define cache_wait	cache_wait_way
 #endif

 static inline void cache_sync(void)
 {
 	void __iomem *base = l2x0_base;

 #ifdef CONFIG_ARM_ERRATA_753970
 	/* write to an unmmapped register */
 	writel_relaxed(0, base + L2X0_DUMMY_REG);
 #else
 	writel_relaxed(0, base + L2X0_CACHE_SYNC);
 #endif
 	cache_wait(base + L2X0_CACHE_SYNC, 1);
 }

 static inline void l2x0_clean_line(unsigned long addr)
 {
 	void __iomem *base = l2x0_base;
 	cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
 	writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA);
 }

 static inline void l2x0_inv_line(unsigned long addr)
 {
 	void __iomem *base = l2x0_base;
 	cache_wait(base + L2X0_INV_LINE_PA, 1);
 	writel_relaxed(addr, base + L2X0_INV_LINE_PA);
 }

 #if defined(CONFIG_PL310_ERRATA_588369) || defined(CONFIG_PL310_ERRATA_727915)

 #define debug_writel(val)	outer_cache.set_debug(val)

 static void l2x0_set_debug(unsigned long val)
 {
 	writel_relaxed(val, l2x0_base + L2X0_DEBUG_CTRL);
 }
 #else
 /* Optimised out for non-errata case */
 static inline void debug_writel(unsigned long val)
 {
 }

 #define l2x0_set_debug	NULL
 #endif

 #ifdef CONFIG_PL310_ERRATA_588369
 static inline void l2x0_flush_line(unsigned long addr)
 {
 	void __iomem *base = l2x0_base;

 	/* Clean by PA followed by Invalidate by PA */
 	cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
 	writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA);
 	cache_wait(base + L2X0_INV_LINE_PA, 1);
 	writel_relaxed(addr, base + L2X0_INV_LINE_PA);
 }
 #else

 static inline void l2x0_flush_line(unsigned long addr)
 {
 	void __iomem *base = l2x0_base;
 	cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
 	writel_relaxed(addr, base + L2X0_CLEAN_INV_LINE_PA);
 }
 #endif

 static void l2x0_cache_sync(void)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&l2x0_lock, flags);
 	cache_sync();
 	spin_unlock_irqrestore(&l2x0_lock, flags);
 }

 static void __l2x0_flush_all(void)
 {
 	debug_writel(0x03);
 	writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_INV_WAY);
 	cache_wait_way(l2x0_base + L2X0_CLEAN_INV_WAY, l2x0_way_mask);
 	cache_sync();
 	debug_writel(0x00);
 }

 static void l2x0_flush_all(void)
 {
 	unsigned long flags;

 	/* clean all ways */
 	spin_lock_irqsave(&l2x0_lock, flags);
 	__l2x0_flush_all();
 	spin_unlock_irqrestore(&l2x0_lock, flags);
 }

 static void l2x0_clean_all(void)
 {
 	unsigned long flags;

 	/* clean all ways */
 	spin_lock_irqsave(&l2x0_lock, flags);
 	writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_WAY);
 	cache_wait_way(l2x0_base + L2X0_CLEAN_WAY, l2x0_way_mask);
 	cache_sync();
 	spin_unlock_irqrestore(&l2x0_lock, flags);
 }

 static void l2x0_inv_all(void)
 {
 	unsigned long flags;

 	/* invalidate all ways */
 	spin_lock_irqsave(&l2x0_lock, flags);
 	/* Invalidating when L2 is enabled is a nono */
 	BUG_ON(readl(l2x0_base + L2X0_CTRL) & 1);
 	writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
 	cache_wait_way(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
 	cache_sync();
 	spin_unlock_irqrestore(&l2x0_lock, flags);
 }

 static void l2x0_inv_range(unsigned long start, unsigned long end)
 {
 	void __iomem *base = l2x0_base;
 	unsigned long flags;

 	spin_lock_irqsave(&l2x0_lock, flags);
 	if (start & (CACHE_LINE_SIZE - 1)) {
 		start &= ~(CACHE_LINE_SIZE - 1);
 		debug_writel(0x03);
 		l2x0_flush_line(start);
 		debug_writel(0x00);
 		start += CACHE_LINE_SIZE;
 	}

 	if (end & (CACHE_LINE_SIZE - 1)) {
 		end &= ~(CACHE_LINE_SIZE - 1);
 		debug_writel(0x03);
 		l2x0_flush_line(end);
 		debug_writel(0x00);
 	}

 	while (start < end) {
 		unsigned long blk_end = start + min(end - start, 4096UL);

 		while (start < blk_end) {
 			l2x0_inv_line(start);
 			start += CACHE_LINE_SIZE;
 		}

 		if (blk_end < end) {
 			spin_unlock_irqrestore(&l2x0_lock, flags);
 			spin_lock_irqsave(&l2x0_lock, flags);
 		}
 	}
 	cache_wait(base + L2X0_INV_LINE_PA, 1);
 	cache_sync();
 	spin_unlock_irqrestore(&l2x0_lock, flags);
 }

 static void l2x0_clean_range(unsigned long start, unsigned long end)
 {
 	void __iomem *base = l2x0_base;
 	unsigned long flags;

 	if ((end - start) >= l2x0_size) {
 		l2x0_clean_all();
 		return;
 	}

 	spin_lock_irqsave(&l2x0_lock, flags);
 	start &= ~(CACHE_LINE_SIZE - 1);
 	while (start < end) {
 		unsigned long blk_end = start + min(end - start, 4096UL);

 		while (start < blk_end) {
 			l2x0_clean_line(start);
 			start += CACHE_LINE_SIZE;
 		}

 		if (blk_end < end) {
 			spin_unlock_irqrestore(&l2x0_lock, flags);
 			spin_lock_irqsave(&l2x0_lock, flags);
 		}
 	}
 	cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
 	cache_sync();
 	spin_unlock_irqrestore(&l2x0_lock, flags);
 }

 static void l2x0_flush_range(unsigned long start, unsigned long end)
 {
 	void __iomem *base = l2x0_base;
 	unsigned long flags;

 	if ((end - start) >= l2x0_size) {
 		l2x0_flush_all();
 		return;
 	}

 	spin_lock_irqsave(&l2x0_lock, flags);
 	start &= ~(CACHE_LINE_SIZE - 1);
 	while (start < end) {
 		unsigned long blk_end = start + min(end - start, 4096UL);

 		debug_writel(0x03);
 		while (start < blk_end) {
 			l2x0_flush_line(start);
 			start += CACHE_LINE_SIZE;
 		}
 		debug_writel(0x00);

 		if (blk_end < end) {
 			spin_unlock_irqrestore(&l2x0_lock, flags);
 			spin_lock_irqsave(&l2x0_lock, flags);
 		}
 	}
 	cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
 	cache_sync();
 	spin_unlock_irqrestore(&l2x0_lock, flags);
 }

 static void l2x0_disable(void)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&l2x0_lock, flags);
 	__l2x0_flush_all();
 	writel_relaxed(0, l2x0_base + L2X0_CTRL);
 	dsb();
 	spin_unlock_irqrestore(&l2x0_lock, flags);
 }

 static void l2x0_unlock(__u32 cache_id)
 {
 	int lockregs;
 	int i;

 	if (cache_id == L2X0_CACHE_ID_PART_L310)
 		lockregs = 8;
 	else
 		/* L210 and unknown types */
 		lockregs = 1;

 	for (i = 0; i < lockregs; i++) {
 		writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
 			       i * L2X0_LOCKDOWN_STRIDE);
 		writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE +
 			       i * L2X0_LOCKDOWN_STRIDE);
 	}
 }

 void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
 {
 	__u32 aux;
 	__u32 cache_id;
 	__u32 way_size = 0;
 	int ways;
 	const char *type;

 	l2x0_base = base;

 	cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
 	aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);

 	aux &= aux_mask;
 	aux |= aux_val;

 	/* Determine the number of ways */
 	switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
 	case L2X0_CACHE_ID_PART_L310:
 		if (aux & (1 << 16))
 			ways = 16;
 		else
 			ways = 8;
 		type = "L310";
 		break;
 	case L2X0_CACHE_ID_PART_L210:
 		ways = (aux >> 13) & 0xf;
 		type = "L210";
 		break;
 	default:
 		/* Assume unknown chips have 8 ways */
 		ways = 8;
 		type = "L2x0 series";
 		break;
 	}

 	l2x0_way_mask = (1 << ways) - 1;

 	/*
 	 * L2 cache Size =  Way size * Number of ways
 	 */
 	way_size = (aux & L2X0_AUX_CTRL_WAY_SIZE_MASK) >> 17;
 	way_size = 1 << (way_size + 3);
 	l2x0_size = ways * way_size * SZ_1K;

 	/*
 	 * Check if l2x0 controller is already enabled.
 	 * If you are booting from non-secure mode
 	 * accessing the below registers will fault.
 	 */
 	if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
 		/* Make sure that I&D is not locked down when starting */
 		l2x0_unlock(cache_id);

 		/* l2x0 controller is disabled */
 		writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);

 		l2x0_saved_regs.aux_ctrl = aux;

 		l2x0_inv_all();

 		/* enable L2X0 */
 		writel_relaxed(1, l2x0_base + L2X0_CTRL);
 	}

 	outer_cache.inv_range = l2x0_inv_range;
 	outer_cache.clean_range = l2x0_clean_range;
 	outer_cache.flush_range = l2x0_flush_range;
 	outer_cache.sync = l2x0_cache_sync;
 	outer_cache.flush_all = l2x0_flush_all;
 	outer_cache.inv_all = l2x0_inv_all;
 	outer_cache.disable = l2x0_disable;
 	outer_cache.set_debug = l2x0_set_debug;

 	printk(KERN_INFO "%s cache controller enabled\n", type);
 	printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x, Cache size: %d B\n",
 			ways, cache_id, aux, l2x0_size);
 }

 #ifdef CONFIG_OF
 static void __init l2x0_of_setup(const struct device_node *np,
 				 __u32 *aux_val, __u32 *aux_mask)
 {
 	u32 data[2] = { 0, 0 };
 	u32 tag = 0;
 	u32 dirty = 0;
 	u32 val = 0, mask = 0;

 	of_property_read_u32(np, "arm,tag-latency", &tag);
 	if (tag) {
 		mask |= L2X0_AUX_CTRL_TAG_LATENCY_MASK;
 		val |= (tag - 1) << L2X0_AUX_CTRL_TAG_LATENCY_SHIFT;
 	}

 	of_property_read_u32_array(np, "arm,data-latency",
 				   data, ARRAY_SIZE(data));
 	if (data[0] && data[1]) {
 		mask |= L2X0_AUX_CTRL_DATA_RD_LATENCY_MASK |
 			L2X0_AUX_CTRL_DATA_WR_LATENCY_MASK;
 		val |= ((data[0] - 1) << L2X0_AUX_CTRL_DATA_RD_LATENCY_SHIFT) |
 		       ((data[1] - 1) << L2X0_AUX_CTRL_DATA_WR_LATENCY_SHIFT);
 	}

 	of_property_read_u32(np, "arm,dirty-latency", &dirty);
 	if (dirty) {
 		mask |= L2X0_AUX_CTRL_DIRTY_LATENCY_MASK;
 		val |= (dirty - 1) << L2X0_AUX_CTRL_DIRTY_LATENCY_SHIFT;
 	}

 	*aux_val &= ~mask;
 	*aux_val |= val;
 	*aux_mask &= ~mask;
 }

 static void __init pl310_of_setup(const struct device_node *np,
 				  __u32 *aux_val, __u32 *aux_mask)
 {
 	u32 data[3] = { 0, 0, 0 };
 	u32 tag[3] = { 0, 0, 0 };
 	u32 filter[2] = { 0, 0 };

 	of_property_read_u32_array(np, "arm,tag-latency", tag, ARRAY_SIZE(tag));
 	if (tag[0] && tag[1] && tag[2])
 		writel_relaxed(
 			((tag[0] - 1) << L2X0_LATENCY_CTRL_RD_SHIFT) |
 			((tag[1] - 1) << L2X0_LATENCY_CTRL_WR_SHIFT) |
 			((tag[2] - 1) << L2X0_LATENCY_CTRL_SETUP_SHIFT),
 			l2x0_base + L2X0_TAG_LATENCY_CTRL);

 	of_property_read_u32_array(np, "arm,data-latency",
 				   data, ARRAY_SIZE(data));
 	if (data[0] && data[1] && data[2])
 		writel_relaxed(
 			((data[0] - 1) << L2X0_LATENCY_CTRL_RD_SHIFT) |
 			((data[1] - 1) << L2X0_LATENCY_CTRL_WR_SHIFT) |
 			((data[2] - 1) << L2X0_LATENCY_CTRL_SETUP_SHIFT),
 			l2x0_base + L2X0_DATA_LATENCY_CTRL);

 	of_property_read_u32_array(np, "arm,filter-ranges",
 				   filter, ARRAY_SIZE(filter));
 	if (filter[1]) {
 		writel_relaxed(ALIGN(filter[0] + filter[1], SZ_1M),
 			       l2x0_base + L2X0_ADDR_FILTER_END);
 		writel_relaxed((filter[0] & ~(SZ_1M - 1)) | L2X0_ADDR_FILTER_EN,
 			       l2x0_base + L2X0_ADDR_FILTER_START);
 	}
 }

 static void __init pl310_save(void)
 {
 	u32 l2x0_revision = readl_relaxed(l2x0_base + L2X0_CACHE_ID) &
 		L2X0_CACHE_ID_RTL_MASK;

 	l2x0_saved_regs.tag_latency = readl_relaxed(l2x0_base +
 		L2X0_TAG_LATENCY_CTRL);
 	l2x0_saved_regs.data_latency = readl_relaxed(l2x0_base +
 		L2X0_DATA_LATENCY_CTRL);
 	l2x0_saved_regs.filter_end = readl_relaxed(l2x0_base +
 		L2X0_ADDR_FILTER_END);
 	l2x0_saved_regs.filter_start = readl_relaxed(l2x0_base +
 		L2X0_ADDR_FILTER_START);

 	if (l2x0_revision >= L2X0_CACHE_ID_RTL_R2P0) {
 		/*
 		 * From r2p0, there is Prefetch offset/control register
 		 */
 		l2x0_saved_regs.prefetch_ctrl = readl_relaxed(l2x0_base +
 			L2X0_PREFETCH_CTRL);
 		/*
 		 * From r3p0, there is Power control register
 		 */
 		if (l2x0_revision >= L2X0_CACHE_ID_RTL_R3P0)
 			l2x0_saved_regs.pwr_ctrl = readl_relaxed(l2x0_base +
 				L2X0_POWER_CTRL);
 	}
 }

 static void l2x0_resume(void)
 {
 	if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
 		/* restore aux ctrl and enable l2 */
 		l2x0_unlock(readl_relaxed(l2x0_base + L2X0_CACHE_ID));

 		writel_relaxed(l2x0_saved_regs.aux_ctrl, l2x0_base +
 			L2X0_AUX_CTRL);

 		l2x0_inv_all();

 		writel_relaxed(1, l2x0_base + L2X0_CTRL);
 	}
 }

 static void pl310_resume(void)
 {
 	u32 l2x0_revision;

 	if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
 		/* restore pl310 setup */
 		writel_relaxed(l2x0_saved_regs.tag_latency,
 			l2x0_base + L2X0_TAG_LATENCY_CTRL);
 		writel_relaxed(l2x0_saved_regs.data_latency,
 			l2x0_base + L2X0_DATA_LATENCY_CTRL);
 		writel_relaxed(l2x0_saved_regs.filter_end,
 			l2x0_base + L2X0_ADDR_FILTER_END);
 		writel_relaxed(l2x0_saved_regs.filter_start,
 			l2x0_base + L2X0_ADDR_FILTER_START);

 		l2x0_revision = readl_relaxed(l2x0_base + L2X0_CACHE_ID) &
 			L2X0_CACHE_ID_RTL_MASK;

 		if (l2x0_revision >= L2X0_CACHE_ID_RTL_R2P0) {
 			writel_relaxed(l2x0_saved_regs.prefetch_ctrl,
 				l2x0_base + L2X0_PREFETCH_CTRL);
 			if (l2x0_revision >= L2X0_CACHE_ID_RTL_R3P0)
 				writel_relaxed(l2x0_saved_regs.pwr_ctrl,
 					l2x0_base + L2X0_POWER_CTRL);
 		}
 	}

 	l2x0_resume();
 }

 static const struct l2x0_of_data pl310_data = {
 	pl310_of_setup,
 	pl310_save,
 	pl310_resume,
 };

 static const struct l2x0_of_data l2x0_data = {
 	l2x0_of_setup,
 	NULL,
 	l2x0_resume,
 };

 static const struct of_device_id l2x0_ids[] __initconst = {
 	{ .compatible = "arm,pl310-cache", .data = (void *)&pl310_data },
 	{ .compatible = "arm,l220-cache", .data = (void *)&l2x0_data },
 	{ .compatible = "arm,l210-cache", .data = (void *)&l2x0_data },
 	{}
 };

 int __init l2x0_of_init(__u32 aux_val, __u32 aux_mask)
 {
 	struct device_node *np;
 	struct l2x0_of_data *data;
 	struct resource res;

 	np = of_find_matching_node(NULL, l2x0_ids);
 	if (!np)
 		return -ENODEV;

 	if (of_address_to_resource(np, 0, &res))
 		return -ENODEV;

 	l2x0_base = ioremap(res.start, resource_size(&res));
 	if (!l2x0_base)
 		return -ENOMEM;

 	l2x0_saved_regs.phy_base = res.start;

 	data = of_match_node(l2x0_ids, np)->data;

 	/* L2 configuration can only be changed if the cache is disabled */
 	if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
 		if (data->setup)
 			data->setup(np, &aux_val, &aux_mask);
 	}

 	if (data->save)
 		data->save();

 	l2x0_init(l2x0_base, aux_val, aux_mask);

 	outer_cache.resume = data->resume;
 	return 0;
 }
 #endif
	/*
	* arch/arm/mm/cache-l2x0.c - L210/L220 cache controller support
	*
	* Copyright (C) 2007 ARM Limited
	*
	* 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.
	*
	* 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/err.h>
	#include <linux/init.h>
	#include <linux/spinlock.h>
	#include <linux/io.h>
	#include <linux/of.h>
	#include <linux/of_address.h>

	#include <asm/cacheflush.h>
	#include <asm/hardware/cache-l2x0.h>

	#define CACHE_LINE_SIZE 32

	static void __iomem *l2x0_base;
	static DEFINE_SPINLOCK(l2x0_lock);
	static uint32_t l2x0_way_mask; /* Bitmask of active ways */
	static uint32_t l2x0_size;

	struct l2x0_regs l2x0_saved_regs;

	struct l2x0_of_data {
	void (setup)(const struct device_node , __u32 , __u32 );
	void (*save)(void);
	void (*resume)(void);
	};

	static inline void cache_wait_way(void __iomem *reg, unsigned long mask)
	{
	/* wait for cache operation by line or way to complete */
	while (readl_relaxed(reg) & mask)
	cpu_relax();
	}

	#ifdef CONFIG_CACHE_PL310
	static inline void cache_wait(void __iomem *reg, unsigned long mask)
	{
	/* cache operations by line are atomic on PL310 */
	}
	#else
	#define cache_wait cache_wait_way
	#endif

	static inline void cache_sync(void)
	{
	void __iomem *base = l2x0_base;

	#ifdef CONFIG_ARM_ERRATA_753970
	/* write to an unmmapped register */
	writel_relaxed(0, base + L2X0_DUMMY_REG);
	#else
	writel_relaxed(0, base + L2X0_CACHE_SYNC);
	#endif
	cache_wait(base + L2X0_CACHE_SYNC, 1);
	}

	static inline void l2x0_clean_line(unsigned long addr)
	{
	void __iomem *base = l2x0_base;
	cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
	writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA);
	}

	static inline void l2x0_inv_line(unsigned long addr)
	{
	void __iomem *base = l2x0_base;
	cache_wait(base + L2X0_INV_LINE_PA, 1);
	writel_relaxed(addr, base + L2X0_INV_LINE_PA);
	}

	#if defined(CONFIG_PL310_ERRATA_588369) \|\| defined(CONFIG_PL310_ERRATA_727915)

	#define debug_writel(val) outer_cache.set_debug(val)

	static void l2x0_set_debug(unsigned long val)
	{
	writel_relaxed(val, l2x0_base + L2X0_DEBUG_CTRL);
	}
	#else
	/* Optimised out for non-errata case */
	static inline void debug_writel(unsigned long val)
	{
	}

	#define l2x0_set_debug NULL
	#endif

	#ifdef CONFIG_PL310_ERRATA_588369
	static inline void l2x0_flush_line(unsigned long addr)
	{
	void __iomem *base = l2x0_base;

	/* Clean by PA followed by Invalidate by PA */
	cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
	writel_relaxed(addr, base + L2X0_CLEAN_LINE_PA);
	cache_wait(base + L2X0_INV_LINE_PA, 1);
	writel_relaxed(addr, base + L2X0_INV_LINE_PA);
	}
	#else

	static inline void l2x0_flush_line(unsigned long addr)
	{
	void __iomem *base = l2x0_base;
	cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
	writel_relaxed(addr, base + L2X0_CLEAN_INV_LINE_PA);
	}
	#endif

	static void l2x0_cache_sync(void)
	{
	unsigned long flags;

	spin_lock_irqsave(&l2x0_lock, flags);
	cache_sync();
	spin_unlock_irqrestore(&l2x0_lock, flags);
	}

	static void __l2x0_flush_all(void)
	{
	debug_writel(0x03);
	writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_INV_WAY);
	cache_wait_way(l2x0_base + L2X0_CLEAN_INV_WAY, l2x0_way_mask);
	cache_sync();
	debug_writel(0x00);
	}

	static void l2x0_flush_all(void)
	{
	unsigned long flags;

	/* clean all ways */
	spin_lock_irqsave(&l2x0_lock, flags);
	__l2x0_flush_all();
	spin_unlock_irqrestore(&l2x0_lock, flags);
	}

	static void l2x0_clean_all(void)
	{
	unsigned long flags;

	/* clean all ways */
	spin_lock_irqsave(&l2x0_lock, flags);
	writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_WAY);
	cache_wait_way(l2x0_base + L2X0_CLEAN_WAY, l2x0_way_mask);
	cache_sync();
	spin_unlock_irqrestore(&l2x0_lock, flags);
	}

	static void l2x0_inv_all(void)
	{
	unsigned long flags;

	/* invalidate all ways */
	spin_lock_irqsave(&l2x0_lock, flags);
	/* Invalidating when L2 is enabled is a nono */
	BUG_ON(readl(l2x0_base + L2X0_CTRL) & 1);
	writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
	cache_wait_way(l2x0_base + L2X0_INV_WAY, l2x0_way_mask);
	cache_sync();
	spin_unlock_irqrestore(&l2x0_lock, flags);
	}

	static void l2x0_inv_range(unsigned long start, unsigned long end)
	{
	void __iomem *base = l2x0_base;
	unsigned long flags;

	spin_lock_irqsave(&l2x0_lock, flags);
	if (start & (CACHE_LINE_SIZE - 1)) {
	start &= ~(CACHE_LINE_SIZE - 1);
	debug_writel(0x03);
	l2x0_flush_line(start);
	debug_writel(0x00);
	start += CACHE_LINE_SIZE;
	}

	if (end & (CACHE_LINE_SIZE - 1)) {
	end &= ~(CACHE_LINE_SIZE - 1);
	debug_writel(0x03);
	l2x0_flush_line(end);
	debug_writel(0x00);
	}

	while (start < end) {
	unsigned long blk_end = start + min(end - start, 4096UL);

	while (start < blk_end) {
	l2x0_inv_line(start);
	start += CACHE_LINE_SIZE;
	}

	if (blk_end < end) {
	spin_unlock_irqrestore(&l2x0_lock, flags);
	spin_lock_irqsave(&l2x0_lock, flags);
	}
	}
	cache_wait(base + L2X0_INV_LINE_PA, 1);
	cache_sync();
	spin_unlock_irqrestore(&l2x0_lock, flags);
	}

	static void l2x0_clean_range(unsigned long start, unsigned long end)
	{
	void __iomem *base = l2x0_base;
	unsigned long flags;

	if ((end - start) >= l2x0_size) {
	l2x0_clean_all();
	return;
	}

	spin_lock_irqsave(&l2x0_lock, flags);
	start &= ~(CACHE_LINE_SIZE - 1);
	while (start < end) {
	unsigned long blk_end = start + min(end - start, 4096UL);

	while (start < blk_end) {
	l2x0_clean_line(start);
	start += CACHE_LINE_SIZE;
	}

	if (blk_end < end) {
	spin_unlock_irqrestore(&l2x0_lock, flags);
	spin_lock_irqsave(&l2x0_lock, flags);
	}
	}
	cache_wait(base + L2X0_CLEAN_LINE_PA, 1);
	cache_sync();
	spin_unlock_irqrestore(&l2x0_lock, flags);
	}

	static void l2x0_flush_range(unsigned long start, unsigned long end)
	{
	void __iomem *base = l2x0_base;
	unsigned long flags;

	if ((end - start) >= l2x0_size) {
	l2x0_flush_all();
	return;
	}

	spin_lock_irqsave(&l2x0_lock, flags);
	start &= ~(CACHE_LINE_SIZE - 1);
	while (start < end) {
	unsigned long blk_end = start + min(end - start, 4096UL);

	debug_writel(0x03);
	while (start < blk_end) {
	l2x0_flush_line(start);
	start += CACHE_LINE_SIZE;
	}
	debug_writel(0x00);

	if (blk_end < end) {
	spin_unlock_irqrestore(&l2x0_lock, flags);
	spin_lock_irqsave(&l2x0_lock, flags);
	}
	}
	cache_wait(base + L2X0_CLEAN_INV_LINE_PA, 1);
	cache_sync();
	spin_unlock_irqrestore(&l2x0_lock, flags);
	}

	static void l2x0_disable(void)
	{
	unsigned long flags;

	spin_lock_irqsave(&l2x0_lock, flags);
	__l2x0_flush_all();
	writel_relaxed(0, l2x0_base + L2X0_CTRL);
	dsb();
	spin_unlock_irqrestore(&l2x0_lock, flags);
	}

	static void l2x0_unlock(__u32 cache_id)
	{
	int lockregs;
	int i;

	if (cache_id == L2X0_CACHE_ID_PART_L310)
	lockregs = 8;
	else
	/* L210 and unknown types */
	lockregs = 1;

	for (i = 0; i < lockregs; i++) {
	writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
	i * L2X0_LOCKDOWN_STRIDE);
	writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE +
	i * L2X0_LOCKDOWN_STRIDE);
	}
	}

	void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
	{
	__u32 aux;
	__u32 cache_id;
	__u32 way_size = 0;
	int ways;
	const char *type;

	l2x0_base = base;

	cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
	aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);

	aux &= aux_mask;
	aux \|= aux_val;

	/* Determine the number of ways */
	switch (cache_id & L2X0_CACHE_ID_PART_MASK) {
	case L2X0_CACHE_ID_PART_L310:
	if (aux & (1 << 16))
	ways = 16;
	else
	ways = 8;
	type = "L310";
	break;
	case L2X0_CACHE_ID_PART_L210:
	ways = (aux >> 13) & 0xf;
	type = "L210";
	break;
	default:
	/* Assume unknown chips have 8 ways */
	ways = 8;
	type = "L2x0 series";
	break;
	}

	l2x0_way_mask = (1 << ways) - 1;

	/*
	* L2 cache Size = Way size * Number of ways
	*/
	way_size = (aux & L2X0_AUX_CTRL_WAY_SIZE_MASK) >> 17;
	way_size = 1 << (way_size + 3);
	l2x0_size = ways * way_size * SZ_1K;

	/*
	* Check if l2x0 controller is already enabled.
	* If you are booting from non-secure mode
	* accessing the below registers will fault.
	*/
	if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
	/* Make sure that I&D is not locked down when starting */
	l2x0_unlock(cache_id);

	/* l2x0 controller is disabled */
	writel_relaxed(aux, l2x0_base + L2X0_AUX_CTRL);

	l2x0_saved_regs.aux_ctrl = aux;

	l2x0_inv_all();

	/* enable L2X0 */
	writel_relaxed(1, l2x0_base + L2X0_CTRL);
	}

	outer_cache.inv_range = l2x0_inv_range;
	outer_cache.clean_range = l2x0_clean_range;
	outer_cache.flush_range = l2x0_flush_range;
	outer_cache.sync = l2x0_cache_sync;
	outer_cache.flush_all = l2x0_flush_all;
	outer_cache.inv_all = l2x0_inv_all;
	outer_cache.disable = l2x0_disable;
	outer_cache.set_debug = l2x0_set_debug;

	printk(KERN_INFO "%s cache controller enabled\n", type);
	printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x, Cache size: %d B\n",
	ways, cache_id, aux, l2x0_size);
	}

	#ifdef CONFIG_OF
	static void __init l2x0_of_setup(const struct device_node *np,
	__u32 aux_val, __u32 aux_mask)
	{
	u32 data[2] = { 0, 0 };
	u32 tag = 0;
	u32 dirty = 0;
	u32 val = 0, mask = 0;

	of_property_read_u32(np, "arm,tag-latency", &tag);
	if (tag) {
	mask \|= L2X0_AUX_CTRL_TAG_LATENCY_MASK;
	val \|= (tag - 1) << L2X0_AUX_CTRL_TAG_LATENCY_SHIFT;
	}

	of_property_read_u32_array(np, "arm,data-latency",
	data, ARRAY_SIZE(data));
	if (data[0] && data[1]) {
	mask \|= L2X0_AUX_CTRL_DATA_RD_LATENCY_MASK \|
	L2X0_AUX_CTRL_DATA_WR_LATENCY_MASK;
	val \|= ((data[0] - 1) << L2X0_AUX_CTRL_DATA_RD_LATENCY_SHIFT) \|
	((data[1] - 1) << L2X0_AUX_CTRL_DATA_WR_LATENCY_SHIFT);
	}

	of_property_read_u32(np, "arm,dirty-latency", &dirty);
	if (dirty) {
	mask \|= L2X0_AUX_CTRL_DIRTY_LATENCY_MASK;
	val \|= (dirty - 1) << L2X0_AUX_CTRL_DIRTY_LATENCY_SHIFT;
	}

	*aux_val &= ~mask;
	*aux_val \|= val;
	*aux_mask &= ~mask;
	}

	static void __init pl310_of_setup(const struct device_node *np,
	__u32 aux_val, __u32 aux_mask)
	{
	u32 data[3] = { 0, 0, 0 };
	u32 tag[3] = { 0, 0, 0 };
	u32 filter[2] = { 0, 0 };

	of_property_read_u32_array(np, "arm,tag-latency", tag, ARRAY_SIZE(tag));
	if (tag[0] && tag[1] && tag[2])
	writel_relaxed(
	((tag[0] - 1) << L2X0_LATENCY_CTRL_RD_SHIFT) \|
	((tag[1] - 1) << L2X0_LATENCY_CTRL_WR_SHIFT) \|
	((tag[2] - 1) << L2X0_LATENCY_CTRL_SETUP_SHIFT),
	l2x0_base + L2X0_TAG_LATENCY_CTRL);

	of_property_read_u32_array(np, "arm,data-latency",
	data, ARRAY_SIZE(data));
	if (data[0] && data[1] && data[2])
	writel_relaxed(
	((data[0] - 1) << L2X0_LATENCY_CTRL_RD_SHIFT) \|
	((data[1] - 1) << L2X0_LATENCY_CTRL_WR_SHIFT) \|
	((data[2] - 1) << L2X0_LATENCY_CTRL_SETUP_SHIFT),
	l2x0_base + L2X0_DATA_LATENCY_CTRL);

	of_property_read_u32_array(np, "arm,filter-ranges",
	filter, ARRAY_SIZE(filter));
	if (filter[1]) {
	writel_relaxed(ALIGN(filter[0] + filter[1], SZ_1M),
	l2x0_base + L2X0_ADDR_FILTER_END);
	writel_relaxed((filter[0] & ~(SZ_1M - 1)) \| L2X0_ADDR_FILTER_EN,
	l2x0_base + L2X0_ADDR_FILTER_START);
	}
	}

	static void __init pl310_save(void)
	{
	u32 l2x0_revision = readl_relaxed(l2x0_base + L2X0_CACHE_ID) &
	L2X0_CACHE_ID_RTL_MASK;

	l2x0_saved_regs.tag_latency = readl_relaxed(l2x0_base +
	L2X0_TAG_LATENCY_CTRL);
	l2x0_saved_regs.data_latency = readl_relaxed(l2x0_base +
	L2X0_DATA_LATENCY_CTRL);
	l2x0_saved_regs.filter_end = readl_relaxed(l2x0_base +
	L2X0_ADDR_FILTER_END);
	l2x0_saved_regs.filter_start = readl_relaxed(l2x0_base +
	L2X0_ADDR_FILTER_START);

	if (l2x0_revision >= L2X0_CACHE_ID_RTL_R2P0) {
	/*
	* From r2p0, there is Prefetch offset/control register
	*/
	l2x0_saved_regs.prefetch_ctrl = readl_relaxed(l2x0_base +
	L2X0_PREFETCH_CTRL);
	/*
	* From r3p0, there is Power control register
	*/
	if (l2x0_revision >= L2X0_CACHE_ID_RTL_R3P0)
	l2x0_saved_regs.pwr_ctrl = readl_relaxed(l2x0_base +
	L2X0_POWER_CTRL);
	}
	}

	static void l2x0_resume(void)
	{
	if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
	/* restore aux ctrl and enable l2 */
	l2x0_unlock(readl_relaxed(l2x0_base + L2X0_CACHE_ID));

	writel_relaxed(l2x0_saved_regs.aux_ctrl, l2x0_base +
	L2X0_AUX_CTRL);

	l2x0_inv_all();

	writel_relaxed(1, l2x0_base + L2X0_CTRL);
	}
	}

	static void pl310_resume(void)
	{
	u32 l2x0_revision;

	if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
	/* restore pl310 setup */
	writel_relaxed(l2x0_saved_regs.tag_latency,
	l2x0_base + L2X0_TAG_LATENCY_CTRL);
	writel_relaxed(l2x0_saved_regs.data_latency,
	l2x0_base + L2X0_DATA_LATENCY_CTRL);
	writel_relaxed(l2x0_saved_regs.filter_end,
	l2x0_base + L2X0_ADDR_FILTER_END);
	writel_relaxed(l2x0_saved_regs.filter_start,
	l2x0_base + L2X0_ADDR_FILTER_START);

	l2x0_revision = readl_relaxed(l2x0_base + L2X0_CACHE_ID) &
	L2X0_CACHE_ID_RTL_MASK;

	if (l2x0_revision >= L2X0_CACHE_ID_RTL_R2P0) {
	writel_relaxed(l2x0_saved_regs.prefetch_ctrl,
	l2x0_base + L2X0_PREFETCH_CTRL);
	if (l2x0_revision >= L2X0_CACHE_ID_RTL_R3P0)
	writel_relaxed(l2x0_saved_regs.pwr_ctrl,
	l2x0_base + L2X0_POWER_CTRL);
	}
	}

	l2x0_resume();
	}

	static const struct l2x0_of_data pl310_data = {
	pl310_of_setup,
	pl310_save,
	pl310_resume,
	};

	static const struct l2x0_of_data l2x0_data = {
	l2x0_of_setup,
	NULL,
	l2x0_resume,
	};

	static const struct of_device_id l2x0_ids[] __initconst = {
	{ .compatible = "arm,pl310-cache", .data = (void *)&pl310_data },
	{ .compatible = "arm,l220-cache", .data = (void *)&l2x0_data },
	{ .compatible = "arm,l210-cache", .data = (void *)&l2x0_data },
	{}
	};

	int __init l2x0_of_init(__u32 aux_val, __u32 aux_mask)
	{
	struct device_node *np;
	struct l2x0_of_data *data;
	struct resource res;

	np = of_find_matching_node(NULL, l2x0_ids);
	if (!np)
	return -ENODEV;

	if (of_address_to_resource(np, 0, &res))
	return -ENODEV;

	l2x0_base = ioremap(res.start, resource_size(&res));
	if (!l2x0_base)
	return -ENOMEM;

	l2x0_saved_regs.phy_base = res.start;

	data = of_match_node(l2x0_ids, np)->data;

	/* L2 configuration can only be changed if the cache is disabled */
	if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & 1)) {
	if (data->setup)
	data->setup(np, &aux_val, &aux_mask);
	}

	if (data->save)
	data->save();

	l2x0_init(l2x0_base, aux_val, aux_mask);

	outer_cache.resume = data->resume;
	return 0;
	}
	#endif