armv7: add PL310 support to u-boot

PL310 is the L2$ controller from ARM used in many SoCs
including the Cortex-A9 based OMAP4430

Add support for some of the key PL310 operations
	- Invalidate all
	- Invalidate range
	- Flush(clean & invalidate) all
	- Flush range

Signed-off-by: Aneesh V <aneesh@ti.com>

2 files changed, 116 insertions, 0 deletions

diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index f993d74..d31321a 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -40,6 +40,7 @@ COBJS-y	+= board.o
 COBJS-y	+= bootm.o
 COBJS-y	+= cache.o
 COBJS-y	+= cache-cp15.o
+COBJS-$(CONFIG_SYS_L2_PL310) += cache-pl310.o
 COBJS-y	+= interrupts.o
 COBJS-y	+= reset.o
 SOBJS-$(CONFIG_USE_ARCH_MEMSET) += memset.o
diff --git a/arch/arm/lib/cache-pl310.c b/arch/arm/lib/cache-pl310.c
new file mode 100644
index 0000000..36c629c
--- /dev/null
+++ b/arch/arm/lib/cache-pl310.c
@@ -0,0 +1,115 @@
+/*
+ * (C) Copyright 2010
+ * Texas Instruments, <www.ti.com>
+ * Aneesh V <aneesh@ti.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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/types.h>
+#include <asm/io.h>
+#include <asm/armv7.h>
+#include <asm/pl310.h>
+#include <config.h>
+
+struct pl310_regs *const pl310 = (struct pl310_regs *)CONFIG_SYS_PL310_BASE;
+
+static void pl310_cache_sync(void)
+{
+	writel(0, &pl310->pl310_cache_sync);
+}
+
+static void pl310_background_op_all_ways(u32 *op_reg)
+{
+	u32 assoc_16, associativity, way_mask;
+
+	assoc_16 = readl(&pl310->pl310_aux_ctrl) &
+			PL310_AUX_CTRL_ASSOCIATIVITY_MASK;
+	if (assoc_16)
+		associativity = 16;
+	else
+		associativity = 8;
+
+	way_mask = (1 << associativity) - 1;
+	/* Invalidate all ways */
+	writel(way_mask, op_reg);
+	/* Wait for all ways to be invalidated */
+	while (readl(op_reg) && way_mask)
+		;
+	pl310_cache_sync();
+}
+
+void v7_outer_cache_inval_all(void)
+{
+	pl310_background_op_all_ways(&pl310->pl310_inv_way);
+}
+
+void v7_outer_cache_flush_all(void)
+{
+	pl310_background_op_all_ways(&pl310->pl310_clean_inv_way);
+}
+
+/* Flush(clean invalidate) memory from start to stop-1 */
+void v7_outer_cache_flush_range(u32 start, u32 stop)
+{
+	/* PL310 currently supports only 32 bytes cache line */
+	u32 pa, line_size = 32;
+
+	/*
+	 * Align to the beginning of cache-line - this ensures that
+	 * the first 5 bits are 0 as required by PL310 TRM
+	 */
+	start &= ~(line_size - 1);
+
+	for (pa = start; pa < stop; pa = pa + line_size)
+		writel(pa, &pl310->pl310_clean_inv_line_pa);
+
+	pl310_cache_sync();
+}
+
+/* invalidate memory from start to stop-1 */
+void v7_outer_cache_inval_range(u32 start, u32 stop)
+{
+	/* PL310 currently supports only 32 bytes cache line */
+	u32 pa, line_size = 32;
+
+	/*
+	 * If start address is not aligned to cache-line flush the first
+	 * line to prevent affecting somebody else's buffer
+	 */
+	if (start & (line_size - 1)) {
+		v7_outer_cache_flush_range(start, start + 1);
+		/* move to next cache line */
+		start = (start + line_size - 1) & ~(line_size - 1);
+	}
+
+	/*
+	 * If stop address is not aligned to cache-line flush the last
+	 * line to prevent affecting somebody else's buffer
+	 */
+	if (stop & (line_size - 1)) {
+		v7_outer_cache_flush_range(stop, stop + 1);
+		/* align to the beginning of this cache line */
+		stop &= ~(line_size - 1);
+	}
+
+	for (pa = start; pa < stop; pa = pa + line_size)
+		writel(pa, &pl310->pl310_inv_line_pa);
+
+	pl310_cache_sync();
+}