[U-Boot] [PATCH v4 6/9] armv7: add PL310 support to u-boot
Aneesh V
aneesh at ti.com
Fri Jun 17 11:30:51 CEST 2011
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 at ti.com>
---
V2:
* More descriptive commit message
* Changes for function pointer to weakly linked change
* C struct for register accesses
---
README | 6 ++
arch/arm/include/asm/pl310.h | 73 ++++++++++++++++++++++++++
arch/arm/lib/Makefile | 1 +
arch/arm/lib/cache-pl310.c | 115 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 195 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/include/asm/pl310.h
create mode 100644 arch/arm/lib/cache-pl310.c
diff --git a/README b/README
index ca1520d..978e438 100644
--- a/README
+++ b/README
@@ -465,6 +465,12 @@ The following options need to be configured:
CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
+- Cache Configuration for ARM:
+ CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
+ controller
+ CONFIG_SYS_PL310_BASE - Physical base address of PL310
+ controller register space
+
- Serial Ports:
CONFIG_PL010_SERIAL
diff --git a/arch/arm/include/asm/pl310.h b/arch/arm/include/asm/pl310.h
new file mode 100644
index 0000000..fb506e6
--- /dev/null
+++ b/arch/arm/include/asm/pl310.h
@@ -0,0 +1,73 @@
+/*
+ * (C) Copyright 2010
+ * Texas Instruments, <www.ti.com>
+ * Aneesh V <aneesh at 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
+ */
+#ifndef _PL310_H_
+#define _PL310_H_
+
+#include <linux/types.h>
+
+/* Register bit fields */
+#define PL310_AUX_CTRL_ASSOCIATIVITY_MASK (1 << 16)
+
+struct pl310_regs {
+ u32 pl310_cache_id;
+ u32 pl310_cache_type;
+ u32 pad1[62];
+ u32 pl310_ctrl;
+ u32 pl310_aux_ctrl;
+ u32 pl310_tag_latency_ctrl;
+ u32 pl310_data_latency_ctrl;
+ u32 pad2[60];
+ u32 pl310_event_cnt_ctrl;
+ u32 pl310_event_cnt1_cfg;
+ u32 pl310_event_cnt0_cfg;
+ u32 pl310_event_cnt1_val;
+ u32 pl310_event_cnt0_val;
+ u32 pl310_intr_mask;
+ u32 pl310_masked_intr_stat;
+ u32 pl310_raw_intr_stat;
+ u32 pl310_intr_clear;
+ u32 pad3[323];
+ u32 pl310_cache_sync;
+ u32 pad4[15];
+ u32 pl310_inv_line_pa;
+ u32 pad5[2];
+ u32 pl310_inv_way;
+ u32 pad6[12];
+ u32 pl310_clean_line_pa;
+ u32 pad7[1];
+ u32 pl310_clean_line_idx;
+ u32 pl310_clean_way;
+ u32 pad8[12];
+ u32 pl310_clean_inv_line_pa;
+ u32 pad9[1];
+ u32 pl310_clean_inv_line_idx;
+ u32 pl310_clean_inv_way;
+};
+
+void pl310_inval_all(void);
+void pl310_clean_inval_all(void);
+void pl310_inval_range(u32 start, u32 end);
+void pl310_clean_inval_range(u32 start, u32 end);
+
+#endif
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 at 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();
+}
--
1.7.0.4
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