arch/arm/mm/cache-l2x0.c - linux - Git at Google

 /*
  * 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/init.h>
 #include <linux/spinlock.h>
 #include <linux/io.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 inline void cache_wait(void __iomem *reg, unsigned long mask)
 {
 	/* wait for the operation to complete */
 	while (readl_relaxed(reg) & mask)
 		;
 }

 static inline void cache_sync(void)
 {
 	void __iomem *base = l2x0_base;
 	writel_relaxed(0, base + L2X0_CACHE_SYNC);
 	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);
 }

 #ifdef CONFIG_PL310_ERRATA_588369
 static void debug_writel(unsigned long val)
 {
 	extern void omap_smc1(u32 fn, u32 arg);

 	/*
 	 * Texas Instrument secure monitor api to modify the
 	 * PL310 Debug Control Register.
 	 */
 	omap_smc1(0x100, val);
 }

 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

 /* Optimised out for non-errata case */
 static inline void debug_writel(unsigned long val)
 {
 }

 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 inline void l2x0_inv_all(void)
 {
 	unsigned long flags;

 	/* invalidate all ways */
 	spin_lock_irqsave(&l2x0_lock, flags);
 	writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
 	cache_wait(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;

 	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;

 	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);
 }

 void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
 {
 	__u32 aux;
 	__u32 cache_id;
 	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;

 	/*
 	 * 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)) {

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

 		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;

 	printk(KERN_INFO "%s cache controller enabled\n", type);
 	printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x\n",
 			 ways, cache_id, aux);
 }
	/*
	* 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/init.h>
	#include <linux/spinlock.h>
	#include <linux/io.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 inline void cache_wait(void __iomem *reg, unsigned long mask)
	{
	/* wait for the operation to complete */
	while (readl_relaxed(reg) & mask)
	;
	}

	static inline void cache_sync(void)
	{
	void __iomem *base = l2x0_base;
	writel_relaxed(0, base + L2X0_CACHE_SYNC);
	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);
	}

	#ifdef CONFIG_PL310_ERRATA_588369
	static void debug_writel(unsigned long val)
	{
	extern void omap_smc1(u32 fn, u32 arg);

	/*
	* Texas Instrument secure monitor api to modify the
	* PL310 Debug Control Register.
	*/
	omap_smc1(0x100, val);
	}

	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

	/* Optimised out for non-errata case */
	static inline void debug_writel(unsigned long val)
	{
	}

	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 inline void l2x0_inv_all(void)
	{
	unsigned long flags;

	/* invalidate all ways */
	spin_lock_irqsave(&l2x0_lock, flags);
	writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
	cache_wait(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;

	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;

	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);
	}

	void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
	{
	__u32 aux;
	__u32 cache_id;
	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;

	/*
	* 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)) {

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

	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;

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