/* SPDX-License-Identifier: GPL-2.0-only */
|
/*
|
* Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved.
|
* Copyright (c) 2011, Google, Inc.
|
*
|
* Author: Colin Cross <ccross@android.com>
|
* Gary King <gking@nvidia.com>
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <soc/tegra/flowctrl.h>
|
|
#include <asm/assembler.h>
|
#include <asm/proc-fns.h>
|
#include <asm/cp15.h>
|
#include <asm/cache.h>
|
|
#include "irammap.h"
|
#include "reset.h"
|
#include "sleep.h"
|
|
#define EMC_CFG 0xc
|
#define EMC_ADR_CFG 0x10
|
#define EMC_NOP 0xdc
|
#define EMC_SELF_REF 0xe0
|
#define EMC_REQ_CTRL 0x2b0
|
#define EMC_EMC_STATUS 0x2b4
|
|
#define CLK_RESET_CCLK_BURST 0x20
|
#define CLK_RESET_CCLK_DIVIDER 0x24
|
#define CLK_RESET_SCLK_BURST 0x28
|
#define CLK_RESET_SCLK_DIVIDER 0x2c
|
#define CLK_RESET_PLLC_BASE 0x80
|
#define CLK_RESET_PLLM_BASE 0x90
|
#define CLK_RESET_PLLP_BASE 0xa0
|
|
#define APB_MISC_XM2CFGCPADCTRL 0x8c8
|
#define APB_MISC_XM2CFGDPADCTRL 0x8cc
|
#define APB_MISC_XM2CLKCFGPADCTRL 0x8d0
|
#define APB_MISC_XM2COMPPADCTRL 0x8d4
|
#define APB_MISC_XM2VTTGENPADCTRL 0x8d8
|
#define APB_MISC_XM2CFGCPADCTRL2 0x8e4
|
#define APB_MISC_XM2CFGDPADCTRL2 0x8e8
|
|
.macro pll_enable, rd, r_car_base, pll_base
|
ldr \rd, [\r_car_base, #\pll_base]
|
tst \rd, #(1 << 30)
|
orreq \rd, \rd, #(1 << 30)
|
streq \rd, [\r_car_base, #\pll_base]
|
.endm
|
|
.macro emc_device_mask, rd, base
|
ldr \rd, [\base, #EMC_ADR_CFG]
|
tst \rd, #(0x3 << 24)
|
moveq \rd, #(0x1 << 8) @ just 1 device
|
movne \rd, #(0x3 << 8) @ 2 devices
|
.endm
|
|
#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
|
/*
|
* tegra20_hotplug_shutdown(void)
|
*
|
* puts the current cpu in reset
|
* should never return
|
*/
|
ENTRY(tegra20_hotplug_shutdown)
|
/* Put this CPU down */
|
cpu_id r0
|
bl tegra20_cpu_shutdown
|
ret lr @ should never get here
|
ENDPROC(tegra20_hotplug_shutdown)
|
|
/*
|
* tegra20_cpu_shutdown(int cpu)
|
*
|
* r0 is cpu to reset
|
*
|
* puts the specified CPU in wait-for-event mode on the flow controller
|
* and puts the CPU in reset
|
* can be called on the current cpu or another cpu
|
* if called on the current cpu, does not return
|
* MUST NOT BE CALLED FOR CPU 0.
|
*
|
* corrupts r0-r3, r12
|
*/
|
ENTRY(tegra20_cpu_shutdown)
|
cmp r0, #0
|
reteq lr @ must not be called for CPU 0
|
|
cpu_to_halt_reg r1, r0
|
ldr r3, =TEGRA_FLOW_CTRL_VIRT
|
mov r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME
|
str r2, [r3, r1] @ put flow controller in wait event mode
|
ldr r2, [r3, r1]
|
isb
|
dsb
|
movw r1, 0x1011
|
mov r1, r1, lsl r0
|
ldr r3, =TEGRA_CLK_RESET_VIRT
|
str r1, [r3, #0x340] @ put slave CPU in reset
|
isb
|
dsb
|
cpu_id r3
|
cmp r3, r0
|
beq .
|
ret lr
|
ENDPROC(tegra20_cpu_shutdown)
|
#endif
|
|
#ifdef CONFIG_PM_SLEEP
|
/*
|
* tegra20_sleep_core_finish(unsigned long v2p)
|
*
|
* Enters suspend in LP0 or LP1 by turning off the mmu and jumping to
|
* tegra20_tear_down_core in IRAM
|
*/
|
ENTRY(tegra20_sleep_core_finish)
|
mov r4, r0
|
/* Flush, disable the L1 data cache and exit SMP */
|
mov r0, #TEGRA_FLUSH_CACHE_ALL
|
bl tegra_disable_clean_inv_dcache
|
mov r0, r4
|
|
mov32 r3, tegra_shut_off_mmu
|
add r3, r3, r0
|
|
mov32 r0, tegra20_tear_down_core
|
mov32 r1, tegra20_iram_start
|
sub r0, r0, r1
|
mov32 r1, TEGRA_IRAM_LPx_RESUME_AREA
|
add r0, r0, r1
|
|
ret r3
|
ENDPROC(tegra20_sleep_core_finish)
|
|
/*
|
* tegra20_tear_down_cpu
|
*
|
* Switches the CPU cluster to PLL-P and enters sleep.
|
*/
|
ENTRY(tegra20_tear_down_cpu)
|
bl tegra_switch_cpu_to_pllp
|
b tegra20_enter_sleep
|
ENDPROC(tegra20_tear_down_cpu)
|
|
/* START OF ROUTINES COPIED TO IRAM */
|
.align L1_CACHE_SHIFT
|
.globl tegra20_iram_start
|
tegra20_iram_start:
|
|
/*
|
* tegra20_lp1_reset
|
*
|
* reset vector for LP1 restore; copied into IRAM during suspend.
|
* Brings the system back up to a safe staring point (SDRAM out of
|
* self-refresh, PLLC, PLLM and PLLP reenabled, CPU running on PLLP,
|
* system clock running on the same PLL that it suspended at), and
|
* jumps to tegra_resume to restore virtual addressing and PLLX.
|
* The physical address of tegra_resume expected to be stored in
|
* PMC_SCRATCH41.
|
*
|
* NOTE: THIS *MUST* BE RELOCATED TO TEGRA_IRAM_LPx_RESUME_AREA.
|
*/
|
ENTRY(tegra20_lp1_reset)
|
/*
|
* The CPU and system bus are running at 32KHz and executing from
|
* IRAM when this code is executed; immediately switch to CLKM and
|
* enable PLLM, PLLP, PLLC.
|
*/
|
mov32 r0, TEGRA_CLK_RESET_BASE
|
|
mov r1, #(1 << 28)
|
str r1, [r0, #CLK_RESET_SCLK_BURST]
|
str r1, [r0, #CLK_RESET_CCLK_BURST]
|
mov r1, #0
|
str r1, [r0, #CLK_RESET_CCLK_DIVIDER]
|
str r1, [r0, #CLK_RESET_SCLK_DIVIDER]
|
|
pll_enable r1, r0, CLK_RESET_PLLM_BASE
|
pll_enable r1, r0, CLK_RESET_PLLP_BASE
|
pll_enable r1, r0, CLK_RESET_PLLC_BASE
|
|
adr r2, tegra20_sdram_pad_address
|
adr r4, tegra20_sdram_pad_save
|
mov r5, #0
|
|
ldr r6, tegra20_sdram_pad_size
|
padload:
|
ldr r7, [r2, r5] @ r7 is the addr in the pad_address
|
|
ldr r1, [r4, r5]
|
str r1, [r7] @ restore the value in pad_save
|
|
add r5, r5, #4
|
cmp r6, r5
|
bne padload
|
|
padload_done:
|
/* 255uS delay for PLL stabilization */
|
mov32 r7, TEGRA_TMRUS_BASE
|
ldr r1, [r7]
|
add r1, r1, #0xff
|
wait_until r1, r7, r9
|
|
adr r4, tegra20_sclk_save
|
ldr r4, [r4]
|
str r4, [r0, #CLK_RESET_SCLK_BURST]
|
mov32 r4, ((1 << 28) | (4)) @ burst policy is PLLP
|
str r4, [r0, #CLK_RESET_CCLK_BURST]
|
|
mov32 r0, TEGRA_EMC_BASE
|
ldr r1, [r0, #EMC_CFG]
|
bic r1, r1, #(1 << 31) @ disable DRAM_CLK_STOP
|
str r1, [r0, #EMC_CFG]
|
|
mov r1, #0
|
str r1, [r0, #EMC_SELF_REF] @ take DRAM out of self refresh
|
mov r1, #1
|
str r1, [r0, #EMC_NOP]
|
str r1, [r0, #EMC_NOP]
|
|
emc_device_mask r1, r0
|
|
exit_selfrefresh_loop:
|
ldr r2, [r0, #EMC_EMC_STATUS]
|
ands r2, r2, r1
|
bne exit_selfrefresh_loop
|
|
mov r1, #0 @ unstall all transactions
|
str r1, [r0, #EMC_REQ_CTRL]
|
|
mov32 r0, TEGRA_PMC_BASE
|
ldr r0, [r0, #PMC_SCRATCH41]
|
ret r0 @ jump to tegra_resume
|
ENDPROC(tegra20_lp1_reset)
|
|
/*
|
* tegra20_tear_down_core
|
*
|
* copied into and executed from IRAM
|
* puts memory in self-refresh for LP0 and LP1
|
*/
|
tegra20_tear_down_core:
|
bl tegra20_sdram_self_refresh
|
bl tegra20_switch_cpu_to_clk32k
|
b tegra20_enter_sleep
|
|
/*
|
* tegra20_switch_cpu_to_clk32k
|
*
|
* In LP0 and LP1 all PLLs will be turned off. Switch the CPU and system clock
|
* to the 32KHz clock.
|
*/
|
tegra20_switch_cpu_to_clk32k:
|
/*
|
* start by switching to CLKM to safely disable PLLs, then switch to
|
* CLKS.
|
*/
|
mov r0, #(1 << 28)
|
str r0, [r5, #CLK_RESET_SCLK_BURST]
|
str r0, [r5, #CLK_RESET_CCLK_BURST]
|
mov r0, #0
|
str r0, [r5, #CLK_RESET_CCLK_DIVIDER]
|
str r0, [r5, #CLK_RESET_SCLK_DIVIDER]
|
|
/* 2uS delay delay between changing SCLK and disabling PLLs */
|
mov32 r7, TEGRA_TMRUS_BASE
|
ldr r1, [r7]
|
add r1, r1, #2
|
wait_until r1, r7, r9
|
|
/* disable PLLM, PLLP and PLLC */
|
ldr r0, [r5, #CLK_RESET_PLLM_BASE]
|
bic r0, r0, #(1 << 30)
|
str r0, [r5, #CLK_RESET_PLLM_BASE]
|
ldr r0, [r5, #CLK_RESET_PLLP_BASE]
|
bic r0, r0, #(1 << 30)
|
str r0, [r5, #CLK_RESET_PLLP_BASE]
|
ldr r0, [r5, #CLK_RESET_PLLC_BASE]
|
bic r0, r0, #(1 << 30)
|
str r0, [r5, #CLK_RESET_PLLC_BASE]
|
|
/* switch to CLKS */
|
mov r0, #0 /* brust policy = 32KHz */
|
str r0, [r5, #CLK_RESET_SCLK_BURST]
|
|
ret lr
|
|
/*
|
* tegra20_enter_sleep
|
*
|
* uses flow controller to enter sleep state
|
* executes from IRAM with SDRAM in selfrefresh when target state is LP0 or LP1
|
* executes from SDRAM with target state is LP2
|
*/
|
tegra20_enter_sleep:
|
mov32 r6, TEGRA_FLOW_CTRL_BASE
|
|
mov r0, #FLOW_CTRL_WAIT_FOR_INTERRUPT
|
orr r0, r0, #FLOW_CTRL_HALT_CPU_IRQ | FLOW_CTRL_HALT_CPU_FIQ
|
cpu_id r1
|
cpu_to_halt_reg r1, r1
|
str r0, [r6, r1]
|
dsb
|
ldr r0, [r6, r1] /* memory barrier */
|
|
halted:
|
dsb
|
wfe /* CPU should be power gated here */
|
isb
|
b halted
|
|
/*
|
* tegra20_sdram_self_refresh
|
*
|
* called with MMU off and caches disabled
|
* puts sdram in self refresh
|
* must be executed from IRAM
|
*/
|
tegra20_sdram_self_refresh:
|
mov32 r1, TEGRA_EMC_BASE @ r1 reserved for emc base addr
|
|
mov r2, #3
|
str r2, [r1, #EMC_REQ_CTRL] @ stall incoming DRAM requests
|
|
emcidle:
|
ldr r2, [r1, #EMC_EMC_STATUS]
|
tst r2, #4
|
beq emcidle
|
|
mov r2, #1
|
str r2, [r1, #EMC_SELF_REF]
|
|
emc_device_mask r2, r1
|
|
emcself:
|
ldr r3, [r1, #EMC_EMC_STATUS]
|
and r3, r3, r2
|
cmp r3, r2
|
bne emcself @ loop until DDR in self-refresh
|
|
adr r2, tegra20_sdram_pad_address
|
adr r3, tegra20_sdram_pad_safe
|
adr r4, tegra20_sdram_pad_save
|
mov r5, #0
|
|
ldr r6, tegra20_sdram_pad_size
|
padsave:
|
ldr r0, [r2, r5] @ r0 is the addr in the pad_address
|
|
ldr r1, [r0]
|
str r1, [r4, r5] @ save the content of the addr
|
|
ldr r1, [r3, r5]
|
str r1, [r0] @ set the save val to the addr
|
|
add r5, r5, #4
|
cmp r6, r5
|
bne padsave
|
padsave_done:
|
|
mov32 r5, TEGRA_CLK_RESET_BASE
|
ldr r0, [r5, #CLK_RESET_SCLK_BURST]
|
adr r2, tegra20_sclk_save
|
str r0, [r2]
|
dsb
|
ret lr
|
|
tegra20_sdram_pad_address:
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGCPADCTRL
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGDPADCTRL
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2CLKCFGPADCTRL
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2COMPPADCTRL
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2VTTGENPADCTRL
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGCPADCTRL2
|
.word TEGRA_APB_MISC_BASE + APB_MISC_XM2CFGDPADCTRL2
|
|
tegra20_sdram_pad_size:
|
.word tegra20_sdram_pad_size - tegra20_sdram_pad_address
|
|
tegra20_sdram_pad_safe:
|
.word 0x8
|
.word 0x8
|
.word 0x0
|
.word 0x8
|
.word 0x5500
|
.word 0x08080040
|
.word 0x0
|
|
tegra20_sclk_save:
|
.word 0x0
|
|
tegra20_sdram_pad_save:
|
.rept (tegra20_sdram_pad_size - tegra20_sdram_pad_address) / 4
|
.long 0
|
.endr
|
|
.ltorg
|
/* dummy symbol for end of IRAM */
|
.align L1_CACHE_SHIFT
|
.globl tegra20_iram_end
|
tegra20_iram_end:
|
b .
|
#endif
|
