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/*
* R-Car Generation 2 Power management support
*
* Copyright (C) 2013 - 2015 Renesas Electronics Corporation
* Copyright (C) 2011 Renesas Solutions Corp.
* Copyright (C) 2011 Magnus Damm
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/smp.h>
#include <asm/io.h>
#include <asm/cputype.h>
#include "common.h"
#include "rcar-gen2.h"
/* RST */
#define RST 0xe6160000
#define CA15BAR 0x0020 /* CA15 Boot Address Register */
#define CA7BAR 0x0030 /* CA7 Boot Address Register */
#define CA15RESCNT 0x0040 /* CA15 Reset Control Register */
#define CA7RESCNT 0x0044 /* CA7 Reset Control Register */
/* SYS Boot Address Register */
#define SBAR_BAREN BIT(4) /* SBAR is valid */
/* Reset Control Registers */
#define CA15RESCNT_CODE 0xa5a50000
#define CA15RESCNT_CPUS 0xf /* CPU0-3 */
#define CA7RESCNT_CODE 0x5a5a0000
#define CA7RESCNT_CPUS 0xf /* CPU0-3 */
/* On-chip RAM */
#define ICRAM1 0xe63c0000 /* Inter Connect RAM1 (4 KiB) */
static inline u32 phys_to_sbar(phys_addr_t addr)
{
return (addr >> 8) & 0xfffffc00;
}
void __init rcar_gen2_pm_init(void)
{
void __iomem *p;
u32 bar;
static int once;
struct device_node *np, *cpus;
bool has_a7 = false;
bool has_a15 = false;
struct resource res;
int error;
if (once++)
return;
cpus = of_find_node_by_path("/cpus");
if (!cpus)
return;
for_each_child_of_node(cpus, np) {
if (of_device_is_compatible(np, "arm,cortex-a15"))
has_a15 = true;
else if (of_device_is_compatible(np, "arm,cortex-a7"))
has_a7 = true;
}
np = of_find_compatible_node(NULL, NULL, "renesas,smp-sram");
if (!np) {
/* No smp-sram in DT, fall back to hardcoded address */
res = (struct resource)DEFINE_RES_MEM(ICRAM1,
shmobile_boot_size);
goto map;
}
error = of_address_to_resource(np, 0, &res);
if (error) {
pr_err("Failed to get smp-sram address: %d\n", error);
return;
}
map:
/* RAM for jump stub, because BAR requires 256KB aligned address */
if (res.start & (256 * 1024 - 1) ||
resource_size(&res) < shmobile_boot_size) {
pr_err("Invalid smp-sram region\n");
return;
}
p = ioremap(res.start, resource_size(&res));
if (!p)
return;
/*
* install the reset vector, use the largest version if we have enough
* memory available
*/
if (resource_size(&res) >= shmobile_boot_size_gen2) {
shmobile_boot_cpu_gen2 = read_cpuid_mpidr();
memcpy_toio(p, shmobile_boot_vector_gen2,
shmobile_boot_size_gen2);
} else {
memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
}
iounmap(p);
/* setup reset vectors */
p = ioremap_nocache(RST, 0x63);
bar = phys_to_sbar(res.start);
if (has_a15) {
writel_relaxed(bar, p + CA15BAR);
writel_relaxed(bar | SBAR_BAREN, p + CA15BAR);
/* de-assert reset for CA15 CPUs */
writel_relaxed((readl_relaxed(p + CA15RESCNT) &
~CA15RESCNT_CPUS) | CA15RESCNT_CODE,
p + CA15RESCNT);
}
if (has_a7) {
writel_relaxed(bar, p + CA7BAR);
writel_relaxed(bar | SBAR_BAREN, p + CA7BAR);
/* de-assert reset for CA7 CPUs */
writel_relaxed((readl_relaxed(p + CA7RESCNT) &
~CA7RESCNT_CPUS) | CA7RESCNT_CODE,
p + CA7RESCNT);
}
iounmap(p);
shmobile_smp_apmu_suspend_init();
}
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