alistair23-linux/arch/arm/mach-exynos/platsmp.c
Linus Torvalds b3345d7c57 ARM: SoC platform changes for 3.17
This is the bulk of new SoC enablement and other platform changes for 3.17:
 
 * Samsung S5PV210 has been converted to DT and multiplatform
 * Clock drivers and bindings for some of the lower-end i.MX 1/2 platforms
 * Kirkwood, one of the popular Marvell platforms, is folded into the
   mvebu platform code, removing mach-kirkwood.
 * Hwmod data for TI AM43xx and DRA7 platforms.
 * More additions of Renesas shmobile platform support
 * Removal of plat-samsung contents that can be removed with S5PV210 being
   multiplatform/DT-enabled and the other two old platforms being removed.
 
 New platforms (most with only basic support right now):
 
 * Hisilicon X5HD2 settop box chipset is introduced
 * Mediatek MT6589 (mobile chipset) is introduced
 * Broadcom BCM7xxx settop box chipset is introduced
 
 + as usual a lot other pieces all over the platform code.
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Merge tag 'soc-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC platform changes from Olof Johansson:
 "This is the bulk of new SoC enablement and other platform changes for
  3.17:

   - Samsung S5PV210 has been converted to DT and multiplatform
   - Clock drivers and bindings for some of the lower-end i.MX 1/2
     platforms
   - Kirkwood, one of the popular Marvell platforms, is folded into the
     mvebu platform code, removing mach-kirkwood
   - Hwmod data for TI AM43xx and DRA7 platforms
   - More additions of Renesas shmobile platform support
   - Removal of plat-samsung contents that can be removed with S5PV210
     being multiplatform/DT-enabled and the other two old platforms
     being removed

  New platforms (most with only basic support right now):

   - Hisilicon X5HD2 settop box chipset is introduced
   - Mediatek MT6589 (mobile chipset) is introduced
   - Broadcom BCM7xxx settop box chipset is introduced

  + as usual a lot other pieces all over the platform code"

* tag 'soc-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (240 commits)
  ARM: hisi: remove smp from machine descriptor
  power: reset: move hisilicon reboot code
  ARM: dts: Add hix5hd2-dkb dts file.
  ARM: debug: Rename Hi3716 to HIX5HD2
  ARM: hisi: enable hix5hd2 SoC
  ARM: hisi: add ARCH_HISI
  MAINTAINERS: add entry for Broadcom ARM STB architecture
  ARM: brcmstb: select GISB arbiter and interrupt drivers
  ARM: brcmstb: add infrastructure for ARM-based Broadcom STB SoCs
  ARM: configs: enable SMP in bcm_defconfig
  ARM: add SMP support for Broadcom mobile SoCs
  Documentation: arm: misc updates to Marvell EBU SoC status
  Documentation: arm: add URLs to public datasheets for the Marvell Armada XP SoC
  ARM: mvebu: fix build without platforms selected
  ARM: mvebu: add cpuidle support for Armada 38x
  ARM: mvebu: add cpuidle support for Armada 370
  cpuidle: mvebu: add Armada 38x support
  cpuidle: mvebu: add Armada 370 support
  cpuidle: mvebu: rename the driver from armada-370-xp to mvebu-v7
  ARM: mvebu: export the SCU address
  ...
2014-08-08 11:14:29 -07:00

330 lines
7.5 KiB
C

/*
* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Cloned from linux/arch/arm/mach-vexpress/platsmp.c
*
* Copyright (C) 2002 ARM Ltd.
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/jiffies.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/of_address.h>
#include <asm/cacheflush.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include <asm/firmware.h>
#include <mach/map.h>
#include "common.h"
#include "regs-pmu.h"
extern void exynos4_secondary_startup(void);
/**
* exynos_core_power_down : power down the specified cpu
* @cpu : the cpu to power down
*
* Power down the specified cpu. The sequence must be finished by a
* call to cpu_do_idle()
*
*/
void exynos_cpu_power_down(int cpu)
{
pmu_raw_writel(0, EXYNOS_ARM_CORE_CONFIGURATION(cpu));
}
/**
* exynos_cpu_power_up : power up the specified cpu
* @cpu : the cpu to power up
*
* Power up the specified cpu
*/
void exynos_cpu_power_up(int cpu)
{
pmu_raw_writel(S5P_CORE_LOCAL_PWR_EN,
EXYNOS_ARM_CORE_CONFIGURATION(cpu));
}
/**
* exynos_cpu_power_state : returns the power state of the cpu
* @cpu : the cpu to retrieve the power state from
*
*/
int exynos_cpu_power_state(int cpu)
{
return (pmu_raw_readl(EXYNOS_ARM_CORE_STATUS(cpu)) &
S5P_CORE_LOCAL_PWR_EN);
}
/**
* exynos_cluster_power_down : power down the specified cluster
* @cluster : the cluster to power down
*/
void exynos_cluster_power_down(int cluster)
{
pmu_raw_writel(0, EXYNOS_COMMON_CONFIGURATION(cluster));
}
/**
* exynos_cluster_power_up : power up the specified cluster
* @cluster : the cluster to power up
*/
void exynos_cluster_power_up(int cluster)
{
pmu_raw_writel(S5P_CORE_LOCAL_PWR_EN,
EXYNOS_COMMON_CONFIGURATION(cluster));
}
/**
* exynos_cluster_power_state : returns the power state of the cluster
* @cluster : the cluster to retrieve the power state from
*
*/
int exynos_cluster_power_state(int cluster)
{
return (pmu_raw_readl(EXYNOS_COMMON_STATUS(cluster)) &
S5P_CORE_LOCAL_PWR_EN);
}
static inline void __iomem *cpu_boot_reg_base(void)
{
if (soc_is_exynos4210() && samsung_rev() == EXYNOS4210_REV_1_1)
return pmu_base_addr + S5P_INFORM5;
return sysram_base_addr;
}
static inline void __iomem *cpu_boot_reg(int cpu)
{
void __iomem *boot_reg;
boot_reg = cpu_boot_reg_base();
if (!boot_reg)
return ERR_PTR(-ENODEV);
if (soc_is_exynos4412())
boot_reg += 4*cpu;
else if (soc_is_exynos5420() || soc_is_exynos5800())
boot_reg += 4;
return boot_reg;
}
/*
* Write pen_release in a way that is guaranteed to be visible to all
* observers, irrespective of whether they're taking part in coherency
* or not. This is necessary for the hotplug code to work reliably.
*/
static void write_pen_release(int val)
{
pen_release = val;
smp_wmb();
sync_cache_w(&pen_release);
}
static void __iomem *scu_base_addr(void)
{
return (void __iomem *)(S5P_VA_SCU);
}
static DEFINE_SPINLOCK(boot_lock);
static void exynos_secondary_init(unsigned int cpu)
{
/*
* let the primary processor know we're out of the
* pen, then head off into the C entry point
*/
write_pen_release(-1);
/*
* Synchronise with the boot thread.
*/
spin_lock(&boot_lock);
spin_unlock(&boot_lock);
}
static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
unsigned long timeout;
u32 mpidr = cpu_logical_map(cpu);
u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
int ret = -ENOSYS;
/*
* Set synchronisation state between this boot processor
* and the secondary one
*/
spin_lock(&boot_lock);
/*
* The secondary processor is waiting to be released from
* the holding pen - release it, then wait for it to flag
* that it has been released by resetting pen_release.
*
* Note that "pen_release" is the hardware CPU core ID, whereas
* "cpu" is Linux's internal ID.
*/
write_pen_release(core_id);
if (!exynos_cpu_power_state(core_id)) {
exynos_cpu_power_up(core_id);
timeout = 10;
/* wait max 10 ms until cpu1 is on */
while (exynos_cpu_power_state(core_id)
!= S5P_CORE_LOCAL_PWR_EN) {
if (timeout-- == 0)
break;
mdelay(1);
}
if (timeout == 0) {
printk(KERN_ERR "cpu1 power enable failed");
spin_unlock(&boot_lock);
return -ETIMEDOUT;
}
}
/*
* Send the secondary CPU a soft interrupt, thereby causing
* the boot monitor to read the system wide flags register,
* and branch to the address found there.
*/
timeout = jiffies + (1 * HZ);
while (time_before(jiffies, timeout)) {
unsigned long boot_addr;
smp_rmb();
boot_addr = virt_to_phys(exynos4_secondary_startup);
/*
* Try to set boot address using firmware first
* and fall back to boot register if it fails.
*/
ret = call_firmware_op(set_cpu_boot_addr, core_id, boot_addr);
if (ret && ret != -ENOSYS)
goto fail;
if (ret == -ENOSYS) {
void __iomem *boot_reg = cpu_boot_reg(core_id);
if (IS_ERR(boot_reg)) {
ret = PTR_ERR(boot_reg);
goto fail;
}
__raw_writel(boot_addr, cpu_boot_reg(core_id));
}
call_firmware_op(cpu_boot, core_id);
arch_send_wakeup_ipi_mask(cpumask_of(cpu));
if (pen_release == -1)
break;
udelay(10);
}
/*
* now the secondary core is starting up let it run its
* calibrations, then wait for it to finish
*/
fail:
spin_unlock(&boot_lock);
return pen_release != -1 ? ret : 0;
}
/*
* Initialise the CPU possible map early - this describes the CPUs
* which may be present or become present in the system.
*/
static void __init exynos_smp_init_cpus(void)
{
void __iomem *scu_base = scu_base_addr();
unsigned int i, ncores;
if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
ncores = scu_base ? scu_get_core_count(scu_base) : 1;
else
/*
* CPU Nodes are passed thru DT and set_cpu_possible
* is set by "arm_dt_init_cpu_maps".
*/
return;
/* sanity check */
if (ncores > nr_cpu_ids) {
pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
ncores, nr_cpu_ids);
ncores = nr_cpu_ids;
}
for (i = 0; i < ncores; i++)
set_cpu_possible(i, true);
}
static void __init exynos_smp_prepare_cpus(unsigned int max_cpus)
{
int i;
exynos_sysram_init();
if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
scu_enable(scu_base_addr());
/*
* Write the address of secondary startup into the
* system-wide flags register. The boot monitor waits
* until it receives a soft interrupt, and then the
* secondary CPU branches to this address.
*
* Try using firmware operation first and fall back to
* boot register if it fails.
*/
for (i = 1; i < max_cpus; ++i) {
unsigned long boot_addr;
u32 mpidr;
u32 core_id;
int ret;
mpidr = cpu_logical_map(i);
core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
boot_addr = virt_to_phys(exynos4_secondary_startup);
ret = call_firmware_op(set_cpu_boot_addr, core_id, boot_addr);
if (ret && ret != -ENOSYS)
break;
if (ret == -ENOSYS) {
void __iomem *boot_reg = cpu_boot_reg(core_id);
if (IS_ERR(boot_reg))
break;
__raw_writel(boot_addr, cpu_boot_reg(core_id));
}
}
}
struct smp_operations exynos_smp_ops __initdata = {
.smp_init_cpus = exynos_smp_init_cpus,
.smp_prepare_cpus = exynos_smp_prepare_cpus,
.smp_secondary_init = exynos_secondary_init,
.smp_boot_secondary = exynos_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_die = exynos_cpu_die,
#endif
};