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/*
* 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 <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"
#define PLL_RESET_WRITE_KEY_MASK 0xffff0000
#define PLL_RESET_WRITE_KEY 0x5a69
#define PLL_RESET BIT(16)
static void __iomem *keystone_rstctrl;
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)
{
struct device_node *node;
node = of_find_compatible_node(NULL, NULL, "ti,keystone-reset");
if (WARN_ON(!node))
pr_warn("ti,keystone-reset node undefined\n");
keystone_rstctrl = of_iomap(node, 0);
if (WARN_ON(!keystone_rstctrl))
pr_warn("ti,keystone-reset iomap error\n");
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;
BUG_ON(meminfo.nr_banks < 1);
mem_start = meminfo.bank[0].start;
mem_end = mem_start + meminfo.bank[0].size - 1;
/* 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 *keystone_match[] __initconst = {
"ti,keystone",
NULL,
};
void keystone_restart(enum reboot_mode mode, const char *cmd)
{
u32 val;
BUG_ON(!keystone_rstctrl);
/* Enable write access to RSTCTRL */
val = readl(keystone_rstctrl);
val &= PLL_RESET_WRITE_KEY_MASK;
val |= PLL_RESET_WRITE_KEY;
writel(val, keystone_rstctrl);
/* Reset the SOC */
val = readl(keystone_rstctrl);
val &= ~PLL_RESET;
writel(val, keystone_rstctrl);
}
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,
.restart = keystone_restart,
.init_meminfo = keystone_init_meminfo,
MACHINE_END
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