369 lines
11 KiB
ArmAsm
369 lines
11 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Low level PM code for TI EMIF
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*
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* Copyright (C) 2016-2017 Texas Instruments Incorporated - http://www.ti.com/
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* Dave Gerlach
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/memory.h>
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#include "emif.h"
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#include "ti-emif-asm-offsets.h"
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#define EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES 0x00a0
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#define EMIF_POWER_MGMT_SR_TIMER_MASK 0x00f0
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#define EMIF_POWER_MGMT_SELF_REFRESH_MODE 0x0200
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#define EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK 0x0700
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#define EMIF_SDCFG_TYPE_DDR2 0x2 << SDRAM_TYPE_SHIFT
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#define EMIF_SDCFG_TYPE_DDR3 0x3 << SDRAM_TYPE_SHIFT
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#define EMIF_STATUS_READY 0x4
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#define AM43XX_EMIF_PHY_CTRL_REG_COUNT 0x120
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#define EMIF_AM437X_REGISTERS 0x1
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.arm
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.align 3
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.arch armv7-a
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ENTRY(ti_emif_sram)
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/*
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* void ti_emif_save_context(void)
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*
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* Used during suspend to save the context of all required EMIF registers
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* to local memory if the EMIF is going to lose context during the sleep
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* transition. Operates on the VIRTUAL address of the EMIF.
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*/
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ENTRY(ti_emif_save_context)
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stmfd sp!, {r4 - r11, lr} @ save registers on stack
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adr r4, ti_emif_pm_sram_data
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ldr r0, [r4, #EMIF_PM_BASE_ADDR_VIRT_OFFSET]
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ldr r2, [r4, #EMIF_PM_REGS_VIRT_OFFSET]
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/* Save EMIF configuration */
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ldr r1, [r0, #EMIF_SDRAM_CONFIG]
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str r1, [r2, #EMIF_SDCFG_VAL_OFFSET]
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ldr r1, [r0, #EMIF_SDRAM_REFRESH_CONTROL]
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str r1, [r2, #EMIF_REF_CTRL_VAL_OFFSET]
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ldr r1, [r0, #EMIF_SDRAM_TIMING_1]
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str r1, [r2, #EMIF_TIMING1_VAL_OFFSET]
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ldr r1, [r0, #EMIF_SDRAM_TIMING_2]
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str r1, [r2, #EMIF_TIMING2_VAL_OFFSET]
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ldr r1, [r0, #EMIF_SDRAM_TIMING_3]
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str r1, [r2, #EMIF_TIMING3_VAL_OFFSET]
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ldr r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
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str r1, [r2, #EMIF_PMCR_VAL_OFFSET]
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ldr r1, [r0, #EMIF_POWER_MANAGEMENT_CTRL_SHDW]
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str r1, [r2, #EMIF_PMCR_SHDW_VAL_OFFSET]
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ldr r1, [r0, #EMIF_SDRAM_OUTPUT_IMPEDANCE_CALIBRATION_CONFIG]
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str r1, [r2, #EMIF_ZQCFG_VAL_OFFSET]
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ldr r1, [r0, #EMIF_DDR_PHY_CTRL_1]
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str r1, [r2, #EMIF_DDR_PHY_CTLR_1_OFFSET]
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ldr r1, [r0, #EMIF_COS_CONFIG]
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str r1, [r2, #EMIF_COS_CONFIG_OFFSET]
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ldr r1, [r0, #EMIF_PRIORITY_TO_CLASS_OF_SERVICE_MAPPING]
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str r1, [r2, #EMIF_PRIORITY_TO_COS_MAPPING_OFFSET]
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ldr r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_1_MAPPING]
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str r1, [r2, #EMIF_CONNECT_ID_SERV_1_MAP_OFFSET]
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ldr r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_2_MAPPING]
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str r1, [r2, #EMIF_CONNECT_ID_SERV_2_MAP_OFFSET]
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ldr r1, [r0, #EMIF_OCP_CONFIG]
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str r1, [r2, #EMIF_OCP_CONFIG_VAL_OFFSET]
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ldr r5, [r4, #EMIF_PM_CONFIG_OFFSET]
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cmp r5, #EMIF_SRAM_AM43_REG_LAYOUT
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bne emif_skip_save_extra_regs
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ldr r1, [r0, #EMIF_READ_WRITE_LEVELING_RAMP_CONTROL]
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str r1, [r2, #EMIF_RD_WR_LEVEL_RAMP_CTRL_OFFSET]
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ldr r1, [r0, #EMIF_READ_WRITE_EXECUTION_THRESHOLD]
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str r1, [r2, #EMIF_RD_WR_EXEC_THRESH_OFFSET]
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ldr r1, [r0, #EMIF_LPDDR2_NVM_TIMING]
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str r1, [r2, #EMIF_LPDDR2_NVM_TIM_OFFSET]
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ldr r1, [r0, #EMIF_LPDDR2_NVM_TIMING_SHDW]
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str r1, [r2, #EMIF_LPDDR2_NVM_TIM_SHDW_OFFSET]
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ldr r1, [r0, #EMIF_DLL_CALIB_CTRL]
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str r1, [r2, #EMIF_DLL_CALIB_CTRL_VAL_OFFSET]
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ldr r1, [r0, #EMIF_DLL_CALIB_CTRL_SHDW]
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str r1, [r2, #EMIF_DLL_CALIB_CTRL_VAL_SHDW_OFFSET]
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/* Loop and save entire block of emif phy regs */
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mov r5, #0x0
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add r4, r2, #EMIF_EXT_PHY_CTRL_VALS_OFFSET
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add r3, r0, #EMIF_EXT_PHY_CTRL_1
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ddr_phy_ctrl_save:
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ldr r1, [r3, r5]
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str r1, [r4, r5]
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add r5, r5, #0x4
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cmp r5, #AM43XX_EMIF_PHY_CTRL_REG_COUNT
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bne ddr_phy_ctrl_save
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emif_skip_save_extra_regs:
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ldmfd sp!, {r4 - r11, pc} @ restore regs and return
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ENDPROC(ti_emif_save_context)
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/*
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* void ti_emif_restore_context(void)
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*
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* Used during resume to restore the context of all required EMIF registers
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* from local memory after the EMIF has lost context during a sleep transition.
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* Operates on the PHYSICAL address of the EMIF.
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*/
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ENTRY(ti_emif_restore_context)
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adr r4, ti_emif_pm_sram_data
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ldr r0, [r4, #EMIF_PM_BASE_ADDR_PHYS_OFFSET]
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ldr r2, [r4, #EMIF_PM_REGS_PHYS_OFFSET]
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/* Config EMIF Timings */
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ldr r1, [r2, #EMIF_DDR_PHY_CTLR_1_OFFSET]
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str r1, [r0, #EMIF_DDR_PHY_CTRL_1]
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str r1, [r0, #EMIF_DDR_PHY_CTRL_1_SHDW]
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ldr r1, [r2, #EMIF_TIMING1_VAL_OFFSET]
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str r1, [r0, #EMIF_SDRAM_TIMING_1]
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str r1, [r0, #EMIF_SDRAM_TIMING_1_SHDW]
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ldr r1, [r2, #EMIF_TIMING2_VAL_OFFSET]
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str r1, [r0, #EMIF_SDRAM_TIMING_2]
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str r1, [r0, #EMIF_SDRAM_TIMING_2_SHDW]
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ldr r1, [r2, #EMIF_TIMING3_VAL_OFFSET]
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str r1, [r0, #EMIF_SDRAM_TIMING_3]
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str r1, [r0, #EMIF_SDRAM_TIMING_3_SHDW]
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ldr r1, [r2, #EMIF_REF_CTRL_VAL_OFFSET]
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str r1, [r0, #EMIF_SDRAM_REFRESH_CONTROL]
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str r1, [r0, #EMIF_SDRAM_REFRESH_CTRL_SHDW]
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ldr r1, [r2, #EMIF_PMCR_VAL_OFFSET]
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str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
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ldr r1, [r2, #EMIF_PMCR_SHDW_VAL_OFFSET]
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str r1, [r0, #EMIF_POWER_MANAGEMENT_CTRL_SHDW]
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ldr r1, [r2, #EMIF_COS_CONFIG_OFFSET]
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str r1, [r0, #EMIF_COS_CONFIG]
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ldr r1, [r2, #EMIF_PRIORITY_TO_COS_MAPPING_OFFSET]
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str r1, [r0, #EMIF_PRIORITY_TO_CLASS_OF_SERVICE_MAPPING]
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ldr r1, [r2, #EMIF_CONNECT_ID_SERV_1_MAP_OFFSET]
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str r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_1_MAPPING]
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ldr r1, [r2, #EMIF_CONNECT_ID_SERV_2_MAP_OFFSET]
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str r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_2_MAPPING]
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ldr r1, [r2, #EMIF_OCP_CONFIG_VAL_OFFSET]
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str r1, [r0, #EMIF_OCP_CONFIG]
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ldr r5, [r4, #EMIF_PM_CONFIG_OFFSET]
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cmp r5, #EMIF_SRAM_AM43_REG_LAYOUT
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bne emif_skip_restore_extra_regs
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ldr r1, [r2, #EMIF_RD_WR_LEVEL_RAMP_CTRL_OFFSET]
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str r1, [r0, #EMIF_READ_WRITE_LEVELING_RAMP_CONTROL]
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ldr r1, [r2, #EMIF_RD_WR_EXEC_THRESH_OFFSET]
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str r1, [r0, #EMIF_READ_WRITE_EXECUTION_THRESHOLD]
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ldr r1, [r2, #EMIF_LPDDR2_NVM_TIM_OFFSET]
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str r1, [r0, #EMIF_LPDDR2_NVM_TIMING]
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ldr r1, [r2, #EMIF_LPDDR2_NVM_TIM_SHDW_OFFSET]
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str r1, [r0, #EMIF_LPDDR2_NVM_TIMING_SHDW]
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ldr r1, [r2, #EMIF_DLL_CALIB_CTRL_VAL_OFFSET]
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str r1, [r0, #EMIF_DLL_CALIB_CTRL]
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ldr r1, [r2, #EMIF_DLL_CALIB_CTRL_VAL_SHDW_OFFSET]
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str r1, [r0, #EMIF_DLL_CALIB_CTRL_SHDW]
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ldr r1, [r2, #EMIF_ZQCFG_VAL_OFFSET]
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str r1, [r0, #EMIF_SDRAM_OUTPUT_IMPEDANCE_CALIBRATION_CONFIG]
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/* Loop and restore entire block of emif phy regs */
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mov r5, #0x0
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/* Load ti_emif_regs_amx3 + EMIF_EXT_PHY_CTRL_VALS_OFFSET for address
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* to phy register save space
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*/
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add r3, r2, #EMIF_EXT_PHY_CTRL_VALS_OFFSET
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add r4, r0, #EMIF_EXT_PHY_CTRL_1
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ddr_phy_ctrl_restore:
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ldr r1, [r3, r5]
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str r1, [r4, r5]
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add r5, r5, #0x4
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cmp r5, #AM43XX_EMIF_PHY_CTRL_REG_COUNT
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bne ddr_phy_ctrl_restore
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emif_skip_restore_extra_regs:
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/*
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* Output impedence calib needed only for DDR3
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* but since the initial state of this will be
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* disabled for DDR2 no harm in restoring the
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* old configuration
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*/
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ldr r1, [r2, #EMIF_ZQCFG_VAL_OFFSET]
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str r1, [r0, #EMIF_SDRAM_OUTPUT_IMPEDANCE_CALIBRATION_CONFIG]
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/* Write to sdcfg last for DDR2 only */
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ldr r1, [r2, #EMIF_SDCFG_VAL_OFFSET]
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and r2, r1, #SDRAM_TYPE_MASK
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cmp r2, #EMIF_SDCFG_TYPE_DDR2
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streq r1, [r0, #EMIF_SDRAM_CONFIG]
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mov pc, lr
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ENDPROC(ti_emif_restore_context)
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/*
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* void ti_emif_run_hw_leveling(void)
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*
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* Used during resume to run hardware leveling again and restore the
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* configuration of the EMIF PHY, only for DDR3.
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*/
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ENTRY(ti_emif_run_hw_leveling)
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adr r4, ti_emif_pm_sram_data
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ldr r0, [r4, #EMIF_PM_BASE_ADDR_PHYS_OFFSET]
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ldr r3, [r0, #EMIF_READ_WRITE_LEVELING_CONTROL]
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orr r3, r3, #RDWRLVLFULL_START
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ldr r2, [r0, #EMIF_SDRAM_CONFIG]
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and r2, r2, #SDRAM_TYPE_MASK
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cmp r2, #EMIF_SDCFG_TYPE_DDR3
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bne skip_hwlvl
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str r3, [r0, #EMIF_READ_WRITE_LEVELING_CONTROL]
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/*
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* If EMIF registers are touched during initial stage of HW
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* leveling sequence there will be an L3 NOC timeout error issued
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* as the EMIF will not respond, which is not fatal, but it is
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* avoidable. This small wait loop is enough time for this condition
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* to clear, even at worst case of CPU running at max speed of 1Ghz.
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*/
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mov r2, #0x2000
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1:
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subs r2, r2, #0x1
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bne 1b
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/* Bit clears when operation is complete */
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2: ldr r1, [r0, #EMIF_READ_WRITE_LEVELING_CONTROL]
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tst r1, #RDWRLVLFULL_START
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bne 2b
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skip_hwlvl:
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mov pc, lr
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ENDPROC(ti_emif_run_hw_leveling)
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/*
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* void ti_emif_enter_sr(void)
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*
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* Programs the EMIF to tell the SDRAM to enter into self-refresh
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* mode during a sleep transition. Operates on the VIRTUAL address
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* of the EMIF.
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*/
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ENTRY(ti_emif_enter_sr)
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stmfd sp!, {r4 - r11, lr} @ save registers on stack
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adr r4, ti_emif_pm_sram_data
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ldr r0, [r4, #EMIF_PM_BASE_ADDR_VIRT_OFFSET]
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ldr r2, [r4, #EMIF_PM_REGS_VIRT_OFFSET]
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ldr r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
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bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK
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orr r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE
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str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
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ldmfd sp!, {r4 - r11, pc} @ restore regs and return
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ENDPROC(ti_emif_enter_sr)
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/*
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* void ti_emif_exit_sr(void)
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*
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* Programs the EMIF to tell the SDRAM to exit self-refresh mode
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* after a sleep transition. Operates on the PHYSICAL address of
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* the EMIF.
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*/
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ENTRY(ti_emif_exit_sr)
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adr r4, ti_emif_pm_sram_data
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ldr r0, [r4, #EMIF_PM_BASE_ADDR_PHYS_OFFSET]
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ldr r2, [r4, #EMIF_PM_REGS_PHYS_OFFSET]
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/*
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* Toggle EMIF to exit refresh mode:
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* if EMIF lost context, PWR_MGT_CTRL is currently 0, writing disable
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* (0x0), wont do diddly squat! so do a toggle from SR(0x2) to disable
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* (0x0) here.
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* *If* EMIF did not lose context, nothing broken as we write the same
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* value(0x2) to reg before we write a disable (0x0).
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*/
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ldr r1, [r2, #EMIF_PMCR_VAL_OFFSET]
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bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK
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orr r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE
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str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
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bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK
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str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
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/* Wait for EMIF to become ready */
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1: ldr r1, [r0, #EMIF_STATUS]
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tst r1, #EMIF_STATUS_READY
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beq 1b
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mov pc, lr
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ENDPROC(ti_emif_exit_sr)
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/*
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* void ti_emif_abort_sr(void)
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*
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* Disables self-refresh after a failed transition to a low-power
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* state so the kernel can jump back to DDR and follow abort path.
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* Operates on the VIRTUAL address of the EMIF.
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*/
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ENTRY(ti_emif_abort_sr)
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stmfd sp!, {r4 - r11, lr} @ save registers on stack
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adr r4, ti_emif_pm_sram_data
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ldr r0, [r4, #EMIF_PM_BASE_ADDR_VIRT_OFFSET]
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ldr r2, [r4, #EMIF_PM_REGS_VIRT_OFFSET]
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ldr r1, [r2, #EMIF_PMCR_VAL_OFFSET]
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bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK
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str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
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/* Wait for EMIF to become ready */
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1: ldr r1, [r0, #EMIF_STATUS]
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tst r1, #EMIF_STATUS_READY
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beq 1b
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ldmfd sp!, {r4 - r11, pc} @ restore regs and return
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ENDPROC(ti_emif_abort_sr)
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.align 3
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ENTRY(ti_emif_pm_sram_data)
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.space EMIF_PM_DATA_SIZE
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ENTRY(ti_emif_sram_sz)
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.word . - ti_emif_save_context
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