[ARM] 4135/1: Add support for the L210/L220 cache controllers

This patch adds the support for the L210/L220 (outer) cache
controller. The cache range operations are done by index/way since L2
cache controller only accepts physical addresses.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 110 insertions, 0 deletions

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index a84eed9f854..af3fa9d622f 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -612,3 +612,7 @@ config NEEDS_SYSCALL_FOR_CMPXCHG
 config OUTER_CACHE
 	bool
 	default n
+
+config CACHE_L2X0
+	bool
+	select OUTER_CACHE
diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
index d2f5672ecf6..2f8b9594777 100644
--- a/arch/arm/mm/Makefile
+++ b/arch/arm/mm/Makefile
@@ -66,3 +66,5 @@ obj-$(CONFIG_CPU_SA1100)	+= proc-sa1100.o
 obj-$(CONFIG_CPU_XSCALE)	+= proc-xscale.o
 obj-$(CONFIG_CPU_XSC3)		+= proc-xsc3.o
 obj-$(CONFIG_CPU_V6)		+= proc-v6.o
+
+obj-$(CONFIG_CACHE_L2X0)	+= cache-l2x0.o
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
new file mode 100644
index 00000000000..08a36f1b35d
--- /dev/null
+++ b/arch/arm/mm/cache-l2x0.c
@@ -0,0 +1,104 @@
+/*
+ * 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 <asm/cacheflush.h>
+#include <asm/io.h>
+#include <asm/hardware/cache-l2x0.h>
+
+#define CACHE_LINE_SIZE		32
+
+static void __iomem *l2x0_base;
+
+static inline void sync_writel(unsigned long val, unsigned long reg,
+			       unsigned long complete_mask)
+{
+	writel(val, l2x0_base + reg);
+	/* wait for the operation to complete */
+	while (readl(l2x0_base + reg) & complete_mask)
+		;
+}
+
+static inline void cache_sync(void)
+{
+	sync_writel(0, L2X0_CACHE_SYNC, 1);
+}
+
+static inline void l2x0_inv_all(void)
+{
+	/* invalidate all ways */
+	sync_writel(0xff, L2X0_INV_WAY, 0xff);
+	cache_sync();
+}
+
+static void l2x0_inv_range(unsigned long start, unsigned long end)
+{
+	unsigned long addr;
+
+	start &= ~(CACHE_LINE_SIZE - 1);
+	for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
+		sync_writel(addr, L2X0_INV_LINE_PA, 1);
+	cache_sync();
+}
+
+static void l2x0_clean_range(unsigned long start, unsigned long end)
+{
+	unsigned long addr;
+
+	start &= ~(CACHE_LINE_SIZE - 1);
+	for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
+		sync_writel(addr, L2X0_CLEAN_LINE_PA, 1);
+	cache_sync();
+}
+
+static void l2x0_flush_range(unsigned long start, unsigned long end)
+{
+	unsigned long addr;
+
+	start &= ~(CACHE_LINE_SIZE - 1);
+	for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
+		sync_writel(addr, L2X0_CLEAN_INV_LINE_PA, 1);
+	cache_sync();
+}
+
+void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
+{
+	__u32 aux;
+
+	l2x0_base = base;
+
+	/* disable L2X0 */
+	writel(0, l2x0_base + L2X0_CTRL);
+
+	aux = readl(l2x0_base + L2X0_AUX_CTRL);
+	aux &= aux_mask;
+	aux |= aux_val;
+	writel(aux, l2x0_base + L2X0_AUX_CTRL);
+
+	l2x0_inv_all();
+
+	/* enable L2X0 */
+	writel(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;
+
+	printk(KERN_INFO "L2X0 cache controller enabled\n");
+}