path: root/arch/arm/mm/cache-l2x0.c

/*
 * 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>
#include "cache-aurora-l2.h"

#define CACHE_LINE_SIZE		32

static void __iomem *l2x0_base;
static DEFINE_RAW_SPINLOCK(l2x0_lock);
static u32 l2x0_way_mask;	/* Bitmask of active ways */
static u32 l2x0_size;
static unsigned long sync_reg_offset = L2X0_CACHE_SYNC;

/* Aurora don't have the cache ID register available, so we have to
 * pass it though the device tree */
static u32  cache_id_part_number_from_dt;

struct l2x0_regs l2x0_saved_regs;

struct l2x0_of_data {
	void (*setup)(const struct device_node *, u32 *, u32 *);
	void (*save)(void);
	struct outer_cache_fns outer_cache;
};

static bool of_init = false;

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;

	writel_relaxed(0, base + sync_reg_offset);
	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)
static inline void debug_writel(unsigned long val)
{
	if (outer_cache.set_debug)
		outer_cache.set_debug(val);
}

static void pl310_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 pl310_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;

	raw_spin_lock_irqsave(&l2x0_lock, flags);
	cache_sync();
	raw_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 */
	raw_spin_lock_irqsave(&l2x0_lock, flags);
	__l2x0_flush_all();
	raw_spin_unlock_irqrestore(&l2x0_lock, flags);
}

static void l2x0_clean_all(void)
{
	unsigned long flags;

	/* clean all ways */
	raw_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();
	raw_spin_unlock_irqrestore(&l2x0_lock, flags);
}

static void l2x0_inv_all(void)
{
	unsigned long flags;

	/* invalidate all ways */
	raw_spin_lock_irqsave(&l2x0_lock, flags);
	/* Invalidating when L2 is enabled is a nono */
	BUG_ON(readl(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN);
	writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY);
	cache_wait_way(l2x0_base + L2X0_INV_WAY<