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/*
* Lowlevel setup for EXYNOS5 based board
*
* Copyright (C) 2013 Samsung Electronics
* Rajeshwari Shinde <rajeshwari.s@samsung.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <config.h>
#include <debug_uart.h>
#include <asm/arch/cpu.h>
#include <asm/arch/dmc.h>
#include <asm/arch/power.h>
#include <asm/arch/tzpc.h>
#include <asm/arch/periph.h>
#include <asm/arch/pinmux.h>
#include <asm/arch/system.h>
#include <asm/armv7.h>
#include "common_setup.h"
#include "exynos5_setup.h"
/* These are the things we can do during low-level init */
enum {
DO_WAKEUP = 1 << 0,
DO_CLOCKS = 1 << 1,
DO_MEM_RESET = 1 << 2,
DO_UART = 1 << 3,
DO_POWER = 1 << 4,
};
#ifdef CONFIG_EXYNOS5420
/*
* Power up secondary CPUs.
*/
static void secondary_cpu_start(void)
{
v7_enable_smp(EXYNOS5420_INFORM_BASE);
svc32_mode_en();
branch_bx(CONFIG_EXYNOS_RELOCATE_CODE_BASE);
}
/*
* This is the entry point of hotplug-in and
* cluster switching.
*/
static void low_power_start(void)
{
uint32_t val, reg_val;
reg_val = readl(EXYNOS5420_SPARE_BASE);
if (reg_val != CPU_RST_FLAG_VAL) {
writel(0x0, CONFIG_LOWPOWER_FLAG);
branch_bx(0x0);
}
reg_val = readl(CONFIG_PHY_IRAM_BASE + 0x4);
if (reg_val != (uint32_t)&low_power_start) {
/* Store jump address as low_power_start if not present */
writel((uint32_t)&low_power_start, CONFIG_PHY_IRAM_BASE + 0x4);
dsb();
sev();
}
/* Set the CPU to SVC32 mode */
svc32_mode_en();
#ifndef CONFIG_SYS_L2CACHE_OFF
/* Read MIDR for Primary Part Number */
mrc_midr(val);
val = (val >> 4);
val &= 0xf;
if (val == 0xf) {
configure_l2_ctlr();
configure_l2_actlr();
v7_enable_l2_hazard_detect();
}
#endif
/* Invalidate L1 & TLB */
val = 0x0;
mcr_tlb(val);
mcr_icache(val);
/* Disable MMU stuff and caches */
mrc_sctlr(val);
val &= ~((0x2 << 12) | 0x7);
val |= ((0x1 << 12) | (0x8 << 8) | 0x2);
mcr_sctlr(val);
/* CPU state is hotplug or reset */
secondary_cpu_start();
/* Core should not enter into WFI here */
wfi();
}
/*
* Pointer to this function is stored in iRam which is used
* for jump and power down of a specific core.
*/
static void power_down_core(void)
{
uint32_t tmp, core_id, core_config;
/* Get the unique core id */
/*
* Multiprocessor Affinity Register
* [11:8] Cluster ID
* [1:0] CPU ID
*/
mrc_mpafr(core_id);
tmp = core_id & 0x3;
core_id = (core_id >> 6) & ~3;
core_id |= tmp;
core_id &= 0x3f;
/* Set the status of the core to low */
core_config = (core_id * CPU_CONFIG_STATUS_OFFSET);
core_config += EXYNOS5420_CPU_CONFIG_BASE;
writel(0x0, core_config);
/* Core enter WFI */
wfi();
}
/*
* Configurations for secondary cores are inapt at this stage.
* Reconfigure secondary cores. Shutdown and change the status
* of all cores except the primary core.
*/
static void secondary_cores_configure(void)
{
/* Clear secondary boot iRAM base */
writel(0x0, (CONFIG_EXYNOS_RELOCATE_CODE_BASE + 0x1C));
/* set lowpower flag and address */
writel(CPU_RST_FLAG_VAL, CONFIG_LOWPOWER_FLAG);
writel((uint32_t)&low_power_start, CONFIG_LOWPOWER_ADDR);
writel(CPU_RST_FLAG_VAL, EXYNOS5420_SPARE_BASE);
/* Store jump address for power down */
writel((uint32_t)&power_down_core, CONFIG_PHY_IRAM_BASE + 0x4);
/* Need all core power down check */
dsb();
sev();
}
extern void relocate_wait_code(void);
#endif
int do_lowlevel_init(void)
{
uint32_t reset_status;
int actions = 0;
arch_cpu_init();
#if !defined(CONFIG_SYS_L2CACHE_OFF) && defined(CONFIG_EXYNOS5420)
/*
* Init L2 cache parameters here for use by boot and resume
*
* These are here instead of in v7_outer_cache_enable() so that the
* L2 cache settings get properly set even at resume time or if we're
* running U-Boot with the cache off. The kernel still needs us to
* set these for it.
*/
configure_l2_ctlr();
configure_l2_actlr();
dsb();
isb();
relocate_wait_code();
/* Reconfigure secondary cores */
secondary_cores_configure();
#endif
reset_status = get_reset_status();
switch (reset_status) {
case S5P_CHECK_SLEEP:
actions = DO_CLOCKS | DO_WAKEUP;
break;
case S5P_CHECK_DIDLE:
case S5P_CHECK_LPA:
actions = DO_WAKEUP;
break;
default:
/* This is a normal boot (not a wake from sleep) */
actions = DO_CLOCKS | DO_MEM_RESET | DO_POWER;
}
if (actions & DO_POWER)
set_ps_hold_ctrl();
if (actions & DO_CLOCKS) {
system_clock_init();
#ifdef CONFIG_DEBUG_UART
exynos_pinmux_config(PERIPH_ID_UART3, PINMUX_FLAG_NONE);
debug_uart_init();
#endif
mem_ctrl_init(actions & DO_MEM_RESET);
tzpc_init();
}
return actions & DO_WAKEUP;
}
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