/* * Low level PM code for TI EMIF * * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/ * Dave Gerlach * * 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 version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include "emif.h" #define EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES 0x00a0 #define EMIF_POWER_MGMT_SR_TIMER_MASK 0x00f0 #define EMIF_POWER_MGMT_SELF_REFRESH_MODE 0x0200 #define EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK 0x0700 #define EMIF_SDCFG_TYPE_DDR2 0x2 << SDRAM_TYPE_SHIFT #define EMIF_STATUS_READY 0x4 #define AM43XX_EMIF_PHY_CTRL_REG_COUNT 0x120 #define EMIF_AM437X_REGISTERS 0x1 .text .align 3 ENTRY(ti_emif_sram) /* * void ti_emif_save_context(void) * * Used during suspend to save the context of all required EMIF registers * to local memory if the EMIF is going to lose context during the sleep * transition. Operates on the VIRTUAL address of the EMIF. */ ENTRY(ti_emif_save_context) stmfd sp!, {r4 - r11, lr} @ save registers on stack ldr r0, ti_emif_base_addr_virt /* Save EMIF configuration */ ldr r1, [r0, #EMIF_SDRAM_CONFIG] str r1, emif_sdcfg_val ldr r1, [r0, #EMIF_SDRAM_REFRESH_CONTROL] str r1, emif_ref_ctrl_val ldr r1, [r0, #EMIF_SDRAM_TIMING_1] str r1, emif_timing1_val ldr r1, [r0, #EMIF_SDRAM_TIMING_2] str r1, emif_timing2_val ldr r1, [r0, #EMIF_SDRAM_TIMING_3] str r1, emif_timing3_val ldr r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL] str r1, emif_pmcr_val ldr r1, [r0, #EMIF_POWER_MANAGEMENT_CTRL_SHDW] str r1, emif_pmcr_shdw_val ldr r1, [r0, #EMIF_SDRAM_OUTPUT_IMPEDANCE_CALIBRATION_CONFIG] str r1, emif_zqcfg_val ldr r1, [r0, #EMIF_DDR_PHY_CTRL_1] str r1, emif_ddr_phy_ctlr_1 ldr r1, [r0, #EMIF_COS_CONFIG] str r1, emif_cos_config ldr r1, [r0, #EMIF_PRIORITY_TO_CLASS_OF_SERVICE_MAPPING] str r1, emif_priority_to_cos_mapping ldr r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_1_MAPPING] str r1, emif_connect_id_serv_1_map ldr r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_2_MAPPING] str r1, emif_connect_id_serv_2_map ldr r1, [r0, #EMIF_OCP_CONFIG] str r1, emif_ocp_config_val ldr r2, ti_emif_sram_config cmp r2, #EMIF_SRAM_AM43_REG_LAYOUT bne emif_skip_save_extra_regs ldr r1, [r0, #EMIF_READ_WRITE_LEVELING_RAMP_CONTROL] str r1, emif_rd_wr_level_ramp_ctrl ldr r1, [r0, #EMIF_READ_WRITE_EXECUTION_THRESHOLD] str r1, emif_rd_wr_exec_thresh ldr r1, [r0, #EMIF_LPDDR2_NVM_TIMING] str r1, emif_lpddr2_nvm_tim ldr r1, [r0, #EMIF_LPDDR2_NVM_TIMING_SHDW] str r1, emif_lpddr2_nvm_tim_shdw ldr r1, [r0, #EMIF_DLL_CALIB_CTRL] str r1, emif_dll_calib_ctrl_val ldr r1, [r0, #EMIF_DLL_CALIB_CTRL_SHDW] str r1, emif_dll_calib_ctrl_val_shdw /* Loop and save entire block of emif phy regs */ mov r2, #0x0 adrl r4, emif_ext_phy_ctrl_vals add r3, r0, #EMIF_EXT_PHY_CTRL_1 ddr_phy_ctrl_save: ldr r1, [r3, r2] str r1, [r4, r2] add r2,r2,#0x4 cmp r2, #AM43XX_EMIF_PHY_CTRL_REG_COUNT bne ddr_phy_ctrl_save emif_skip_save_extra_regs: ldmfd sp!, {r4 - r11, pc} @ restore regs and return ENDPROC(ti_emif_save_context) /* * void ti_emif_restore_context(void) * * Used during resume to restore the context of all required EMIF registers * from local memory after the EMIF has lost context during a sleep transition. * Operates on the PHYSICAL address of the EMIF. */ ENTRY(ti_emif_restore_context) stmfd sp!, {r4 - r11, lr} @ save registers on stack ldr r0, ti_emif_base_addr_phys /* Config EMIF Timings */ ldr r1, emif_ddr_phy_ctlr_1 str r1, [r0, #EMIF_DDR_PHY_CTRL_1] str r1, [r0, #EMIF_DDR_PHY_CTRL_1_SHDW] ldr r1, emif_timing1_val str r1, [r0, #EMIF_SDRAM_TIMING_1] str r1, [r0, #EMIF_SDRAM_TIMING_1_SHDW] ldr r1, emif_timing2_val str r1, [r0, #EMIF_SDRAM_TIMING_2] str r1, [r0, #EMIF_SDRAM_TIMING_2_SHDW] ldr r1, emif_timing3_val str r1, [r0, #EMIF_SDRAM_TIMING_3] str r1, [r0, #EMIF_SDRAM_TIMING_3_SHDW] ldr r1, emif_ref_ctrl_val str r1, [r0, #EMIF_SDRAM_REFRESH_CONTROL] str r1, [r0, #EMIF_SDRAM_REFRESH_CTRL_SHDW] ldr r1, emif_pmcr_val str r1, [r0, #EMIF_POWER_MANAGEMENT_CTRL_SHDW] ldr r1, emif_pmcr_shdw_val str r1, [r0, #EMIF_POWER_MANAGEMENT_CTRL_SHDW] ldr r1, emif_cos_config str r1, [r0, #EMIF_COS_CONFIG] ldr r1, emif_priority_to_cos_mapping str r1, [r0, #EMIF_PRIORITY_TO_CLASS_OF_SERVICE_MAPPING] ldr r1, emif_connect_id_serv_1_map str r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_1_MAPPING] ldr r1, emif_connect_id_serv_2_map str r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_2_MAPPING] ldr r1, emif_ocp_config_val str r1, [r0, #EMIF_OCP_CONFIG] ldr r2, ti_emif_sram_config cmp r2, #EMIF_SRAM_AM43_REG_LAYOUT bne emif_skip_restore_extra_regs ldr r1, emif_rd_wr_level_ramp_ctrl str r1, [r0, #EMIF_READ_WRITE_LEVELING_RAMP_CONTROL] ldr r1, emif_rd_wr_exec_thresh str r1, [r0, #EMIF_READ_WRITE_EXECUTION_THRESHOLD] ldr r1, emif_lpddr2_nvm_tim str r1, [r0, #EMIF_LPDDR2_NVM_TIMING] ldr r1, emif_lpddr2_nvm_tim_shdw str r1, [r0, #EMIF_LPDDR2_NVM_TIMING_SHDW] ldr r1, emif_dll_calib_ctrl_val str r1, [r0, #EMIF_DLL_CALIB_CTRL] ldr r1, emif_dll_calib_ctrl_val_shdw str r1, [r0, #EMIF_DLL_CALIB_CTRL_SHDW] ldr r1, emif_zqcfg_val str r1, [r0, #EMIF_SDRAM_OUTPUT_IMPEDANCE_CALIBRATION_CONFIG] /* Loop and restore entire block of emif phy regs */ mov r2, #0x0 adrl r3, emif_ext_phy_ctrl_vals add r4, r0, #EMIF_EXT_PHY_CTRL_1 ddr_phy_ctrl_restore: ldr r1, [r3, r2] str r1, [r4, r2] add r2, r2, #0x4 cmp r2, #AM43XX_EMIF_PHY_CTRL_REG_COUNT bne ddr_phy_ctrl_restore emif_skip_restore_extra_regs: /* * Output impedence calib needed only for DDR3 * but since the initial state of this will be * disabled for DDR2 no harm in restoring the * old configuration */ ldr r1, emif_zqcfg_val str r1, [r0, #EMIF_SDRAM_OUTPUT_IMPEDANCE_CALIBRATION_CONFIG] /* Write to sdcfg last for DDR2 only */ ldr r1, emif_sdcfg_val and r2, r1, #SDRAM_TYPE_MASK cmp r2, #EMIF_SDCFG_TYPE_DDR2 streq r1, [r0, #EMIF_SDRAM_CONFIG] ldmfd sp!, {r4 - r11, pc} @ restore regs and return ENDPROC(ti_emif_restore_context) /* * void ti_emif_enter_sr(void) * * Programs the EMIF to tell the SDRAM to enter into self-refresh * mode during a sleep transition. Operates on the VIRTUAL address * of the EMIF. */ ENTRY(ti_emif_enter_sr) stmfd sp!, {r4 - r11, lr} @ save registers on stack ldr r0, ti_emif_base_addr_virt ldr r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL] bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK orr r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL] ldmfd sp!, {r4 - r11, pc} @ restore regs and return ENDPROC(ti_emif_enter_sr) /* * void ti_emif_exit_sr(void) * * Programs the EMIF to tell the SDRAM to exit self-refresh mode * after a sleep transition. Operates on the PHYSICAL address of * the EMIF. */ ENTRY(ti_emif_exit_sr) stmfd sp!, {r4 - r11, lr} @ save registers on stack ldr r0, ti_emif_base_addr_phys /* * Toggle EMIF to exit refresh mode: * if EMIF lost context, PWR_MGT_CTRL is currently 0, writing disable * (0x0), wont do diddly squat! so do a toggle from SR(0x2) to disable * (0x0) here. * *If* EMIF did not lose context, nothing broken as we write the same * value(0x2) to reg before we write a disable (0x0). */ ldr r1, emif_pmcr_val bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK orr r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL] bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL] /* Wait for EMIF to become ready */ 1: ldr r1, [r0, #EMIF_STATUS] tst r1, #EMIF_STATUS_READY beq 1b ldmfd sp!, {r4 - r11, pc} @ restore regs and return ENDPROC(ti_emif_exit_sr) /* * void ti_emif_abort_sr(void) * * Disables self-refresh after a failed transition to a low-power * state so the kernel can jump back to DDR and follow abort path. * Operates on the VIRTUAL address of the EMIF. */ ENTRY(ti_emif_abort_sr) stmfd sp!, {r4 - r11, lr} @ save registers on stack ldr r0, ti_emif_base_addr_virt ldr r1, emif_pmcr_val bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL] /* Wait for EMIF to become ready */ 1: ldr r1, [r0, #EMIF_STATUS] tst r1, #EMIF_STATUS_READY beq 1b ldmfd sp!, {r4 - r11, pc} @ restore regs and return ENDPROC(ti_emif_abort_sr) .align 3 /* DDR related defines */ emif_rd_lat_val: .word 0xDEADBEEF emif_timing1_val: .word 0xDEADBEEF emif_timing2_val: .word 0xDEADBEEF emif_timing3_val: .word 0xDEADBEEF emif_sdcfg_val: .word 0xDEADBEEF emif_ref_ctrl_val: .word 0xDEADBEEF emif_zqcfg_val: .word 0xDEADBEEF emif_pmcr_val: .word 0xDEADBEEF emif_pmcr_shdw_val: .word 0xDEADBEEF emif_rd_wr_level_ramp_ctrl: .word 0xDEADBEEF emif_rd_wr_exec_thresh: .word 0xDEADBEEF emif_cos_config: .word 0xDEADBEEF emif_priority_to_cos_mapping: .word 0xDEADBEEF emif_connect_id_serv_1_map: .word 0xDEADBEEF emif_connect_id_serv_2_map: .word 0xDEADBEEF emif_ocp_config_val: .word 0xDEADBEEF emif_lpddr2_nvm_tim: .word 0xDEADBEEF emif_lpddr2_nvm_tim_shdw: .word 0xDEADBEEF emif_dll_calib_ctrl_val: .word 0xDEADBEEF emif_dll_calib_ctrl_val_shdw: .word 0xDEADBEEF emif_ddr_phy_ctlr_1: .word 0xDEADBEEF emif_ext_phy_ctrl_vals: .space 0x120 ENTRY(ti_emif_base_addr_virt) .word 0x00000000 ENTRY(ti_emif_base_addr_phys) .word 0x00000000 ENTRY(ti_emif_pm) .word ti_emif_save_context - ti_emif_sram .word ti_emif_restore_context - ti_emif_sram .word ti_emif_enter_sr - ti_emif_sram .word ti_emif_exit_sr - ti_emif_sram .word ti_emif_abort_sr - ti_emif_sram ENTRY(ti_emif_sram_config) .word 0x00000000 ENTRY(ti_emif_sram_sz) .word . - ti_emif_save_context