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 <nsekhar@ti.com>
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index a0fe747..16b20ce 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -25,6 +25,7 @@
#include <linux/irqchip/irq-crossbar.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 +72,26 @@
}
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 @@
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);