From 1306c08a7cd7e6136490ab2bc728d2c39741003e Mon Sep 17 00:00:00 2001 From: Rajendra Nayak Date: Wed, 10 Sep 2014 11:04:04 -0500 Subject: [PATCH] ARM: OMAP4+: Remove static iotable mappings for SRAM 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. omap_bus_sync will be NOP until SRAM initialization happens. Suggested-by: Sekhar Nori Signed-off-by: Rajendra Nayak Signed-off-by: Dave Gerlach Signed-off-by: Tony Lindgren --- .../devicetree/bindings/arm/omap/mpu.txt | 3 +++ 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 | 22 ++++++++++++++++++- arch/arm/mach-omap2/sram.c | 6 ----- arch/arm/mach-omap2/sram.h | 6 ----- 7 files changed, 27 insertions(+), 31 deletions(-) diff --git a/Documentation/devicetree/bindings/arm/omap/mpu.txt b/Documentation/devicetree/bindings/arm/omap/mpu.txt index 83f405bde138..763695db2bd9 100644 --- a/Documentation/devicetree/bindings/arm/omap/mpu.txt +++ b/Documentation/devicetree/bindings/arm/omap/mpu.txt @@ -10,6 +10,9 @@ Required properties: Should be "ti,omap5-mpu" for OMAP5 - ti,hwmods: "mpu" +Optional properties: +- sram: Phandle to the ocmcram node + Examples: - For an OMAP5 SMP system: diff --git a/arch/arm/boot/dts/omap4.dtsi b/arch/arm/boot/dts/omap4.dtsi index e54992f0bf27..8a944974d72e 100644 --- a/arch/arm/boot/dts/omap4.dtsi +++ b/arch/arm/boot/dts/omap4.dtsi @@ -81,6 +81,7 @@ 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 779d4da19f3b..4a6091d717b5 100644 --- a/arch/arm/boot/dts/omap5.dtsi +++ b/arch/arm/boot/dts/omap5.dtsi @@ -104,8 +104,9 @@ 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 831805e40529..b8ad045bcb8d 100644 --- a/arch/arm/mach-omap2/io.c +++ b/arch/arm/mach-omap2/io.c @@ -231,15 +231,6 @@ 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_RW_SO, - }, -#endif - }; #endif @@ -269,14 +260,6 @@ 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_RW_SO, - }, -#endif }; #endif diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c index a0fe747634c1..16b20cedc38d 100644 --- a/arch/arm/mach-omap2/omap4-common.c +++ b/arch/arm/mach-omap2/omap4-common.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include @@ -71,6 +72,26 @@ 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); + if (!sram_pool) + pr_warn("%s:Unable to get sram pool needed to handle errata I688\n", + __func__); + else + 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 +112,6 @@ void __init omap_barriers_init(void) dram_io_desc[0].type = MT_MEMORY_RW_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 e5ac29d69810..cd488b80ba36 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 3f83b802dbb2..948d3edefc38 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 -- 2.20.1