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-rw-r--r--arch/arm/mach-keystone/keystone.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c
new file mode 100644
index 000000000..066208758
--- /dev/null
+++ b/arch/arm/mach-keystone/keystone.c
@@ -0,0 +1,119 @@
+/*
+ * Keystone2 based boards and SOC related code.
+ *
+ * Copyright 2013 Texas Instruments, Inc.
+ * Cyril Chemparathy <cyril@ti.com>
+ * Santosh Shilimkar <santosh.shillimkar@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/init.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/memblock.h>
+
+#include <asm/setup.h>
+#include <asm/mach/map.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/time.h>
+#include <asm/smp_plat.h>
+#include <asm/memory.h>
+
+#include "memory.h"
+
+#include "keystone.h"
+
+static struct notifier_block platform_nb;
+static unsigned long keystone_dma_pfn_offset __read_mostly;
+
+static int keystone_platform_notifier(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct device *dev = data;
+
+ if (event != BUS_NOTIFY_ADD_DEVICE)
+ return NOTIFY_DONE;
+
+ if (!dev)
+ return NOTIFY_BAD;
+
+ if (!dev->of_node) {
+ dev->dma_pfn_offset = keystone_dma_pfn_offset;
+ dev_err(dev, "set dma_pfn_offset%08lx\n",
+ dev->dma_pfn_offset);
+ }
+ return NOTIFY_OK;
+}
+
+static void __init keystone_init(void)
+{
+ keystone_pm_runtime_init();
+ if (platform_nb.notifier_call)
+ bus_register_notifier(&platform_bus_type, &platform_nb);
+ of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+}
+
+static phys_addr_t keystone_virt_to_idmap(unsigned long x)
+{
+ return (phys_addr_t)(x) - CONFIG_PAGE_OFFSET + KEYSTONE_LOW_PHYS_START;
+}
+
+static void __init keystone_init_meminfo(void)
+{
+ bool lpae = IS_ENABLED(CONFIG_ARM_LPAE);
+ bool pvpatch = IS_ENABLED(CONFIG_ARM_PATCH_PHYS_VIRT);
+ phys_addr_t offset = PHYS_OFFSET - KEYSTONE_LOW_PHYS_START;
+ phys_addr_t mem_start, mem_end;
+
+ mem_start = memblock_start_of_DRAM();
+ mem_end = memblock_end_of_DRAM();
+
+ /* nothing to do if we are running out of the <32-bit space */
+ if (mem_start >= KEYSTONE_LOW_PHYS_START &&
+ mem_end <= KEYSTONE_LOW_PHYS_END)
+ return;
+
+ if (!lpae || !pvpatch) {
+ pr_crit("Enable %s%s%s to run outside 32-bit space\n",
+ !lpae ? __stringify(CONFIG_ARM_LPAE) : "",
+ (!lpae && !pvpatch) ? " and " : "",
+ !pvpatch ? __stringify(CONFIG_ARM_PATCH_PHYS_VIRT) : "");
+ }
+
+ if (mem_start < KEYSTONE_HIGH_PHYS_START ||
+ mem_end > KEYSTONE_HIGH_PHYS_END) {
+ pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
+ (u64)mem_start, (u64)mem_end);
+ }
+
+ offset += KEYSTONE_HIGH_PHYS_START;
+ __pv_phys_pfn_offset = PFN_DOWN(offset);
+ __pv_offset = (offset - PAGE_OFFSET);
+
+ /* Populate the arch idmap hook */
+ arch_virt_to_idmap = keystone_virt_to_idmap;
+ platform_nb.notifier_call = keystone_platform_notifier;
+ keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
+ KEYSTONE_LOW_PHYS_START);
+
+ pr_info("Switching to high address space at 0x%llx\n", (u64)offset);
+}
+
+static const char *const keystone_match[] __initconst = {
+ "ti,keystone",
+ NULL,
+};
+
+DT_MACHINE_START(KEYSTONE, "Keystone")
+#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
+ .dma_zone_size = SZ_2G,
+#endif
+ .smp = smp_ops(keystone_smp_ops),
+ .init_machine = keystone_init,
+ .dt_compat = keystone_match,
+ .init_meminfo = keystone_init_meminfo,
+MACHINE_END