initial_commit

1 files changed, 395 insertions, 0 deletions

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
new file mode 100644
index 00000000..19d5d86a
--- /dev/null
+++ b/arch/arm/mm/cache-l2x0.c
@@ -0,0 +1,395 @@
+/*
+ * 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 uint32_t l2x0_size;
+static u32 l2x0_cache_id;
+static unsigned int l2x0_sets;
+static unsigned int l2x0_ways;
+
+static inline bool is_pl310_rev(int rev)
+{
+	return (l2x0_cache_id &
+		(L2X0_CACHE_ID_PART_MASK | L2X0_CACHE_ID_REV_MASK)) ==
+			(L2X0_CACHE_ID_PART_L310 | rev);
+}
+
+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)
+		;
+}
+
+#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);
+}
+
+#ifdef CONFIG_PL310_ERRATA_727915
+static void l2x0_for_each_set_way(void __iomem *reg)
+{
+	int set;
+	int way;
+	unsigned long flags;
+
+	for (way = 0; way < l2x0_ways; way++) {
+		spin_lock_irqsave(&l2x0_lock, flags);
+		for (set = 0; set < l2x0_sets; set++)
+			writel_relaxed((way << 28) | (set << 5), reg);
+		cache_sync();
+		spin_unlock_irqrestore(&l2x0_lock, flags);
+	}
+}
+#endif
+
+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;
+
+#ifdef CONFIG_PL310_ERRATA_727915
+	if (is_pl310_rev(REV_PL310_R2P0)) {
+		l2x0_for_each_set_way(l2x0_base + L2X0_CLEAN_INV_LINE_IDX);
+		return;
+	}
+#endif
+
+	/* 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;
+
+#ifdef CONFIG_PL310_ERRATA_727915
+	if (is_pl310_rev(REV_PL310_R2P0)) {
+		l2x0_for_each_set_way(l2x0_base + L2X0_CLEAN_LINE_IDX);
+		return;
+	}
+#endif
+
+	/* clean all ways */
+	spin_lock_irqsave(&l2x0_lock, flags);
+	debug_writel(0x03);
+	writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_CLEAN_WAY);
+	cache_wait_way(l2x0_base + L2X0_CLEAN_WAY, l2x0_way_mask);
+	cache_sync();
+	debug_writel(0x00);
+	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);
+}
+
+void l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
+{
+	__u32 aux;
+	__u32 way_size = 0;
+	const char *type;
+
+	l2x0_base = base;
+
+	l2x0_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 (l2x0_cache_id & L2X0_CACHE_ID_PART_MASK) {
+	case L2X0_CACHE_ID_PART_L310:
+		if (aux & (1 << 16))
+			l2x0_ways = 16;
+		else
+			l2x0_ways = 8;
+		type = "L310";
+		break;
+	case L2X0_CACHE_ID_PART_L210:
+		l2x0_ways = (aux >> 13) & 0xf;
+		type = "L210";
+		break;
+	default:
+		/* Assume unknown chips have 8 ways */
+		l2x0_ways = 8;
+		type = "L2x0 series";
+		break;
+	}
+
+	l2x0_way_mask = (1 << l2x0_ways) - 1;
+
+	/*
+	 * L2 cache Size =  Way size * Number of ways
+	 */
+	way_size = (aux & L2X0_AUX_CTRL_WAY_SIZE_MASK) >> 17;
+	way_size = SZ_1K << (way_size + 3);
+	l2x0_size = l2x0_ways * way_size;
+	l2x0_sets = way_size / CACHE_LINE_SIZE;
+
+	/*
+	 * 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;
+	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",
+			l2x0_ways, l2x0_cache_id, aux, l2x0_size);
+}