diff options
Diffstat (limited to 'kernel/arch/arm/mach-keystone/keystone.c')
| -rw-r--r-- | kernel/arch/arm/mach-keystone/keystone.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-keystone/keystone.c b/kernel/arch/arm/mach-keystone/keystone.c new file mode 100644 index 000000000..066208758 --- /dev/null +++ b/kernel/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 |