In order to handle errata I688, a page of sram was reserved by doing a
static iotable map. Now that we use gen_pool to manage sram, we can
completely remove all of these static mappings and use gen_pool_alloc()
to get the one page of sram space needed to implement errata I688.
Suggested-by: Sekhar Nori <nsekhar@xxxxxx>
Signed-off-by: Rajendra Nayak <rnayak@xxxxxx>
---
Documentation/devicetree/bindings/arm/omap/mpu.txt | 5 ++++-
arch/arm/boot/dts/omap4.dtsi | 1 +
arch/arm/boot/dts/omap5.dtsi | 3 ++-
arch/arm/mach-omap2/io.c | 17 -----------------
arch/arm/mach-omap2/omap4-common.c | 17 ++++++++++++++++-
arch/arm/mach-omap2/sram.c | 6 ------
arch/arm/mach-omap2/sram.h | 6 ------
7 files changed, 23 insertions(+), 32 deletions(-)
diff --git a/Documentation/devicetree/bindings/arm/omap/mpu.txt b/Documentation/devicetree/bindings/arm/omap/mpu.txt
index 1a5a42c..8915ba3 100644
--- a/Documentation/devicetree/bindings/arm/omap/mpu.txt
+++ b/Documentation/devicetree/bindings/arm/omap/mpu.txt
@@ -6,9 +6,12 @@ The MPU contain CPUs, GIC, L2 cache and a local PRCM.
Required properties:
- compatible : Should be "ti,omap3-mpu" for OMAP3
- Should be "ti,omap4-mpu" for OMAP4
+ Should be "ti,omap4-mpu" for OMAP4 and OMAP5
- ti,hwmods: "mpu"
+Optional properties:
+- sram: Phandle to the ocmcram node
+
Examples:
- For an OMAP4 SMP system:
diff --git a/arch/arm/boot/dts/omap4.dtsi b/arch/arm/boot/dts/omap4.dtsi
index 1ba6a77..9114241 100644
--- a/arch/arm/boot/dts/omap4.dtsi
+++ b/arch/arm/boot/dts/omap4.dtsi
@@ -71,6 +71,7 @@
mpu {
compatible = "ti,omap4-mpu";
ti,hwmods = "mpu";
+ sram = <&ocmcram>;
};
dsp {
diff --git a/arch/arm/boot/dts/omap5.dtsi b/arch/arm/boot/dts/omap5.dtsi
index 461ffd8..e9b735b 100644
--- a/arch/arm/boot/dts/omap5.dtsi
+++ b/arch/arm/boot/dts/omap5.dtsi
@@ -72,8 +72,9 @@
soc {
compatible = "ti,omap-infra";
mpu {
- compatible = "ti,omap5-mpu";
+ compatible = "ti,omap4-mpu";
ti,hwmods = "mpu";
+ sram = <&ocmcram>;
};
};
diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c
index 4a3f06f..8b2334e 100644
--- a/arch/arm/mach-omap2/io.c
+++ b/arch/arm/mach-omap2/io.c
@@ -239,15 +239,6 @@ static struct map_desc omap44xx_io_desc[] __initdata = {
.length = L4_PER_44XX_SIZE,
.type = MT_DEVICE,
},
-#ifdef CONFIG_OMAP4_ERRATA_I688
- {
- .virtual = OMAP4_SRAM_VA,
- .pfn = __phys_to_pfn(OMAP4_SRAM_PA),
- .length = PAGE_SIZE,
- .type = MT_MEMORY_SO,
- },
-#endif
-
};
#endif
@@ -277,14 +268,6 @@ static struct map_desc omap54xx_io_desc[] __initdata = {
.length = L4_PER_54XX_SIZE,
.type = MT_DEVICE,
},
-#ifdef CONFIG_OMAP4_ERRATA_I688
- {
- .virtual = OMAP4_SRAM_VA,
- .pfn = __phys_to_pfn(OMAP4_SRAM_PA),
- .length = PAGE_SIZE,
- .type = MT_MEMORY_SO,
- },
-#endif
};
#endif
diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index 5791143..6b5ffb3 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -24,6 +24,7 @@
#include <linux/irqchip/arm-gic.h>
#include <linux/of_address.h>
#include <linux/reboot.h>
+#include <linux/genalloc.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/mach/map.h>
@@ -71,6 +72,21 @@ void omap_bus_sync(void)
}
EXPORT_SYMBOL(omap_bus_sync);
+static int __init omap4_sram_init(void)
+{
+ struct device_node *np;
+ struct gen_pool *sram_pool;
+
+ np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu");
+ if (!np)
+ pr_warn("%s:Unable to allocate sram needed to handle errata I688\n",
+ __func__);
+ sram_pool = of_get_named_gen_pool(np, "sram", 0);
+ sram_sync = (void *)gen_pool_alloc(sram_pool, PAGE_SIZE);
+ return 0;
+}
+omap_arch_initcall(omap4_sram_init);
+
/* Steal one page physical memory for barrier implementation */
int __init omap_barrier_reserve_memblock(void)
{
@@ -91,7 +107,6 @@ void __init omap_barriers_init(void)
dram_io_desc[0].type = MT_MEMORY_SO;
iotable_init(dram_io_desc, ARRAY_SIZE(dram_io_desc));
dram_sync = (void __iomem *) dram_io_desc[0].virtual;
- sram_sync = (void __iomem *) OMAP4_SRAM_VA;
pr_info("OMAP4: Map 0x%08llx to 0x%08lx for dram barrier\n",
(long long) paddr, dram_io_desc[0].virtual);
diff --git a/arch/arm/mach-omap2/sram.c b/arch/arm/mach-omap2/sram.c
index d5ecb75..8591044 100644
--- a/arch/arm/mach-omap2/sram.c
+++ b/arch/arm/mach-omap2/sram.c
@@ -124,12 +124,6 @@ static void __init omap2_map_sram(void)
{
int cached = 1;
-#ifdef CONFIG_OMAP4_ERRATA_I688
- if (cpu_is_omap44xx()) {
- omap_sram_start += PAGE_SIZE;
- omap_sram_size -= SZ_16K;
- }
-#endif
if (cpu_is_omap34xx()) {
/*
* SRAM must be marked as non-cached on OMAP3 since the
diff --git a/arch/arm/mach-omap2/sram.h b/arch/arm/mach-omap2/sram.h
index 3f83b80..948d3ed 100644
--- a/arch/arm/mach-omap2/sram.h
+++ b/arch/arm/mach-omap2/sram.h
@@ -74,9 +74,3 @@ static inline void omap_push_sram_idle(void) {}
*/
#define OMAP2_SRAM_PA 0x40200000
#define OMAP3_SRAM_PA 0x40200000
-#ifdef CONFIG_OMAP4_ERRATA_I688
-#define OMAP4_SRAM_PA 0x40304000
-#define OMAP4_SRAM_VA 0xfe404000
-#else
-#define OMAP4_SRAM_PA 0x40300000
-#endif
--
1.7.9.5
--
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