Commit b36ab975 authored by Peter De Schrijver's avatar Peter De Schrijver Committed by Olof Johansson

ARM: tegra: rework Tegra secondary CPU core bringup

Prepare the Tegra secondary CPU core bringup code for other Tegra variants.
The reset handler is also generalized to allow for future introduction of
powersaving modes which turn off the CPU cores.

Based on work by:

Scott Williams <scwilliams@nvidia.com>
Chris Johnson <cwj@nvidia.com>
Colin Cross <ccross@android.com>
Signed-off-by: default avatarPeter De Schrijver <pdeschrijver@nvidia.com>
Acked-by: default avatarStephen Warren <swarren@nvidia.com>
Tested-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parent 26fe681f
......@@ -19,6 +19,7 @@ obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += pinmux-tegra30-tables.o
obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += board-dt-tegra30.o
obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += tegra30_clocks.o
obj-$(CONFIG_SMP) += platsmp.o localtimer.o headsmp.o
obj-$(CONFIG_SMP) += reset.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
obj-$(CONFIG_TEGRA_SYSTEM_DMA) += dma.o apbio.o
obj-$(CONFIG_CPU_FREQ) += cpu-tegra.o
......
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/cache.h>
#include <mach/iomap.h>
#include "flowctrl.h"
#include "reset.h"
#define APB_MISC_GP_HIDREV 0x804
#define PMC_SCRATCH41 0x140
#define RESET_DATA(x) ((TEGRA_RESET_##x)*4)
.macro mov32, reg, val
movw \reg, #:lower16:\val
movt \reg, #:upper16:\val
.endm
.section ".text.head", "ax"
__CPUINIT
......@@ -47,15 +64,117 @@ ENTRY(v7_invalidate_l1)
mov pc, lr
ENDPROC(v7_invalidate_l1)
ENTRY(tegra_secondary_startup)
msr cpsr_fsxc, #0xd3
bl v7_invalidate_l1
mrc p15, 0, r0, c0, c0, 5
and r0, r0, #15
ldr r1, =0x6000f100
str r0, [r1]
1: ldr r2, [r1]
cmp r0, r2
beq 1b
/* Enable coresight */
mov32 r0, 0xC5ACCE55
mcr p14, 0, r0, c7, c12, 6
b secondary_startup
ENDPROC(tegra_secondary_startup)
.align L1_CACHE_SHIFT
ENTRY(__tegra_cpu_reset_handler_start)
/*
* __tegra_cpu_reset_handler:
*
* Common handler for all CPU reset events.
*
* Register usage within the reset handler:
*
* R7 = CPU present (to the OS) mask
* R8 = CPU in LP1 state mask
* R9 = CPU in LP2 state mask
* R10 = CPU number
* R11 = CPU mask
* R12 = pointer to reset handler data
*
* NOTE: This code is copied to IRAM. All code and data accesses
* must be position-independent.
*/
.align L1_CACHE_SHIFT
ENTRY(__tegra_cpu_reset_handler)
cpsid aif, 0x13 @ SVC mode, interrupts disabled
mrc p15, 0, r10, c0, c0, 5 @ MPIDR
and r10, r10, #0x3 @ R10 = CPU number
mov r11, #1
mov r11, r11, lsl r10 @ R11 = CPU mask
adr r12, __tegra_cpu_reset_handler_data
#ifdef CONFIG_SMP
/* Does the OS know about this CPU? */
ldr r7, [r12, #RESET_DATA(MASK_PRESENT)]
tst r7, r11 @ if !present
bleq __die @ CPU not present (to OS)
#endif
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
/* Are we on Tegra20? */
mov32 r6, TEGRA_APB_MISC_BASE
ldr r0, [r6, #APB_MISC_GP_HIDREV]
and r0, r0, #0xff00
cmp r0, #(0x20 << 8)
bne 1f
/* If not CPU0, don't let CPU0 reset CPU1 now that CPU1 is coming up. */
mov32 r6, TEGRA_PMC_BASE
mov r0, #0
cmp r10, #0
strne r0, [r6, #PMC_SCRATCH41]
1:
#endif
#ifdef CONFIG_SMP
/*
* Can only be secondary boot (initial or hotplug) but CPU 0
* cannot be here.
*/
cmp r10, #0
bleq __die @ CPU0 cannot be here
ldr lr, [r12, #RESET_DATA(STARTUP_SECONDARY)]
cmp lr, #0
bleq __die @ no secondary startup handler
bx lr
#endif
/*
* We don't know why the CPU reset. Just kill it.
* The LR register will contain the address we died at + 4.
*/
__die:
sub lr, lr, #4
mov32 r7, TEGRA_PMC_BASE
str lr, [r7, #PMC_SCRATCH41]
mov32 r7, TEGRA_CLK_RESET_BASE
/* Are we on Tegra20? */
mov32 r6, TEGRA_APB_MISC_BASE
ldr r0, [r6, #APB_MISC_GP_HIDREV]
and r0, r0, #0xff00
cmp r0, #(0x20 << 8)
bne 1f
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
mov32 r0, 0x1111
mov r1, r0, lsl r10
str r1, [r7, #0x340] @ CLK_RST_CPU_CMPLX_SET
#endif
1:
/* If the CPU still isn't dead, just spin here. */
b .
ENDPROC(__tegra_cpu_reset_handler)
.align L1_CACHE_SHIFT
.type __tegra_cpu_reset_handler_data, %object
.globl __tegra_cpu_reset_handler_data
__tegra_cpu_reset_handler_data:
.rept TEGRA_RESET_DATA_SIZE
.long 0
.endr
.align L1_CACHE_SHIFT
ENTRY(__tegra_cpu_reset_handler_end)
......@@ -113,6 +113,9 @@
#define TEGRA_AHB_GIZMO_BASE 0x6000C004
#define TEGRA_AHB_GIZMO_SIZE 0x10C
#define TEGRA_SB_BASE 0x6000C200
#define TEGRA_SB_SIZE 256
#define TEGRA_STATMON_BASE 0x6000C400
#define TEGRA_STATMON_SIZE SZ_1K
......
......@@ -26,18 +26,26 @@
#include <mach/iomap.h>
#include "fuse.h"
#include "flowctrl.h"
#include "reset.h"
extern void tegra_secondary_startup(void);
static DEFINE_SPINLOCK(boot_lock);
static void __iomem *scu_base = IO_ADDRESS(TEGRA_ARM_PERIF_BASE);
#define EVP_CPU_RESET_VECTOR \
(IO_ADDRESS(TEGRA_EXCEPTION_VECTORS_BASE) + 0x100)
#define CLK_RST_CONTROLLER_CLK_CPU_CMPLX \
(IO_ADDRESS(TEGRA_CLK_RESET_BASE) + 0x4c)
#define CLK_RST_CONTROLLER_RST_CPU_CMPLX_SET \
(IO_ADDRESS(TEGRA_CLK_RESET_BASE) + 0x340)
#define CLK_RST_CONTROLLER_RST_CPU_CMPLX_CLR \
(IO_ADDRESS(TEGRA_CLK_RESET_BASE) + 0x344)
#define CPU_CLOCK(cpu) (0x1<<(8+cpu))
#define CPU_RESET(cpu) (0x1111ul<<(cpu))
void __cpuinit platform_secondary_init(unsigned int cpu)
{
/*
......@@ -47,63 +55,62 @@ void __cpuinit platform_secondary_init(unsigned int cpu)
*/
gic_secondary_init(0);
/*
* Synchronise with the boot thread.
*/
spin_lock(&boot_lock);
spin_unlock(&boot_lock);
}
int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
static int tegra20_power_up_cpu(unsigned int cpu)
{
unsigned long old_boot_vector;
unsigned long boot_vector;
unsigned long timeout;
u32 reg;
/*
* set synchronisation state between this boot processor
* and the secondary one
*/
spin_lock(&boot_lock);
/* set the reset vector to point to the secondary_startup routine */
boot_vector = virt_to_phys(tegra_secondary_startup);
old_boot_vector = readl(EVP_CPU_RESET_VECTOR);
writel(boot_vector, EVP_CPU_RESET_VECTOR);
/* enable cpu clock on cpu1 */
/* Enable the CPU clock. */
reg = readl(CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
writel(reg & ~CPU_CLOCK(cpu), CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
barrier();
reg = readl(CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
writel(reg & ~(1<<9), CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
reg = (1<<13) | (1<<9) | (1<<5) | (1<<1);
writel(reg, CLK_RST_CONTROLLER_RST_CPU_CMPLX_CLR);
smp_wmb();
flush_cache_all();
/* Clear flow controller CSR. */
flowctrl_write_cpu_csr(cpu, 0);
/* unhalt the cpu */
writel(0, IO_ADDRESS(TEGRA_FLOW_CTRL_BASE) + 0x14);
return 0;
}
timeout = jiffies + (1 * HZ);
while (time_before(jiffies, timeout)) {
if (readl(EVP_CPU_RESET_VECTOR) != boot_vector)
break;
udelay(10);
}
int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
{
int status;
/* put the old boot vector back */
writel(old_boot_vector, EVP_CPU_RESET_VECTOR);
/* Force the CPU into reset. The CPU must remain in reset when the
* flow controller state is cleared (which will cause the flow
* controller to stop driving reset if the CPU has been power-gated
* via the flow controller). This will have no effect on first boot
* of the CPU since it should already be in reset.
*/
writel(CPU_RESET(cpu), CLK_RST_CONTROLLER_RST_CPU_CMPLX_SET);
dmb();
/*
* now the secondary core is starting up let it run its
* calibrations, then wait for it to finish
* Unhalt the CPU. If the flow controller was used to power-gate the
* CPU this will cause the flow controller to stop driving reset.
* The CPU will remain in reset because the clock and reset block
* is now driving reset.
*/
spin_unlock(&boot_lock);
flowctrl_write_cpu_halt(cpu, 0);
switch (tegra_chip_id) {
case TEGRA20:
status = tegra20_power_up_cpu(cpu);
break;
default:
status = -EINVAL;
break;
}
return 0;
if (status)
goto done;
/* Take the CPU out of reset. */
writel(CPU_RESET(cpu), CLK_RST_CONTROLLER_RST_CPU_CMPLX_CLR);
wmb();
done:
return status;
}
/*
......@@ -128,6 +135,6 @@ void __init smp_init_cpus(void)
void __init platform_smp_prepare_cpus(unsigned int max_cpus)
{
tegra_cpu_reset_handler_init();
scu_enable(scu_base);
}
/*
* arch/arm/mach-tegra/reset.c
*
* Copyright (C) 2011,2012 NVIDIA Corporation.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/cpumask.h>
#include <linux/bitops.h>
#include <asm/cacheflush.h>
#include <asm/hardware/cache-l2x0.h>
#include <mach/iomap.h>
#include <mach/irammap.h>
#include "reset.h"
#include "fuse.h"
#define TEGRA_IRAM_RESET_BASE (TEGRA_IRAM_BASE + \
TEGRA_IRAM_RESET_HANDLER_OFFSET)
static bool is_enabled;
static void tegra_cpu_reset_handler_enable(void)
{
void __iomem *iram_base = IO_ADDRESS(TEGRA_IRAM_RESET_BASE);
void __iomem *evp_cpu_reset =
IO_ADDRESS(TEGRA_EXCEPTION_VECTORS_BASE + 0x100);
void __iomem *sb_ctrl = IO_ADDRESS(TEGRA_SB_BASE);
u32 reg;
BUG_ON(is_enabled);
BUG_ON(tegra_cpu_reset_handler_size > TEGRA_IRAM_RESET_HANDLER_SIZE);
memcpy(iram_base, (void *)__tegra_cpu_reset_handler_start,
tegra_cpu_reset_handler_size);
/*
* NOTE: This must be the one and only write to the EVP CPU reset
* vector in the entire system.
*/
writel(TEGRA_IRAM_RESET_BASE + tegra_cpu_reset_handler_offset,
evp_cpu_reset);
wmb();
reg = readl(evp_cpu_reset);
/*
* Prevent further modifications to the physical reset vector.
* NOTE: Has no effect on chips prior to Tegra30.
*/
if (tegra_chip_id != TEGRA20) {
reg = readl(sb_ctrl);
reg |= 2;
writel(reg, sb_ctrl);
wmb();
}
is_enabled = true;
}
void __init tegra_cpu_reset_handler_init(void)
{
#ifdef CONFIG_SMP
__tegra_cpu_reset_handler_data[TEGRA_RESET_MASK_PRESENT] =
*((u32 *)cpu_present_mask);
__tegra_cpu_reset_handler_data[TEGRA_RESET_STARTUP_SECONDARY] =
virt_to_phys((void *)tegra_secondary_startup);
#endif
tegra_cpu_reset_handler_enable();
}
/*
* arch/arm/mach-tegra/reset.h
*
* CPU reset dispatcher.
*
* Copyright (c) 2011, NVIDIA Corporation.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef __MACH_TEGRA_RESET_H
#define __MACH_TEGRA_RESET_H
#define TEGRA_RESET_MASK_PRESENT 0
#define TEGRA_RESET_MASK_LP1 1
#define TEGRA_RESET_MASK_LP2 2
#define TEGRA_RESET_STARTUP_SECONDARY 3
#define TEGRA_RESET_STARTUP_LP2 4
#define TEGRA_RESET_STARTUP_LP1 5
#define TEGRA_RESET_DATA_SIZE 6
#ifndef __ASSEMBLY__
extern unsigned long __tegra_cpu_reset_handler_data[TEGRA_RESET_DATA_SIZE];
void __tegra_cpu_reset_handler_start(void);
void __tegra_cpu_reset_handler(void);
void __tegra_cpu_reset_handler_end(void);
void tegra_secondary_startup(void);
#define tegra_cpu_reset_handler_offset \
((u32)__tegra_cpu_reset_handler - \
(u32)__tegra_cpu_reset_handler_start)
#define tegra_cpu_reset_handler_size \
(__tegra_cpu_reset_handler_end - \
__tegra_cpu_reset_handler_start)
void __init tegra_cpu_reset_handler_init(void);
#endif
#endif
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