| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * arch/arm/mach-at91/pm_slow_clock.S |
| * |
| * Copyright (C) 2006 Savin Zlobec |
| * |
| * AT91SAM9 support: |
| * Copyright (C) 2007 Anti Sullin <anti.sullin@artecdesign.ee> |
| */ |
| #include <linux/linkage.h> |
| #include <linux/clk/at91_pmc.h> |
| #include "pm.h" |
| #include "generated/at91_pm_data-offsets.h" |
| |
| #define SRAMC_SELF_FRESH_ACTIVE 0x01 |
| #define SRAMC_SELF_FRESH_EXIT 0x00 |
| |
| pmc .req r0 |
| tmp1 .req r4 |
| tmp2 .req r5 |
| |
| /* |
| * Wait until master clock is ready (after switching master clock source) |
| */ |
| .macro wait_mckrdy |
| 1: ldr tmp1, [pmc, #AT91_PMC_SR] |
| tst tmp1, #AT91_PMC_MCKRDY |
| beq 1b |
| .endm |
| |
| /* |
| * Wait until master oscillator has stabilized. |
| */ |
| .macro wait_moscrdy |
| 1: ldr tmp1, [pmc, #AT91_PMC_SR] |
| tst tmp1, #AT91_PMC_MOSCS |
| beq 1b |
| .endm |
| |
| /* |
| * Wait for main oscillator selection is done |
| */ |
| .macro wait_moscsels |
| 1: ldr tmp1, [pmc, #AT91_PMC_SR] |
| tst tmp1, #AT91_PMC_MOSCSELS |
| beq 1b |
| .endm |
| |
| /* |
| * Put the processor to enter the idle state |
| */ |
| .macro at91_cpu_idle |
| |
| #if defined(CONFIG_CPU_V7) |
| mov tmp1, #AT91_PMC_PCK |
| str tmp1, [pmc, #AT91_PMC_SCDR] |
| |
| dsb |
| |
| wfi @ Wait For Interrupt |
| #else |
| mcr p15, 0, tmp1, c7, c0, 4 |
| #endif |
| |
| .endm |
| |
| .text |
| |
| .arm |
| |
| /* |
| * void at91_suspend_sram_fn(struct at91_pm_data*) |
| * @input param: |
| * @r0: base address of struct at91_pm_data |
| */ |
| /* at91_pm_suspend_in_sram must be 8-byte aligned per the requirements of fncpy() */ |
| .align 3 |
| ENTRY(at91_pm_suspend_in_sram) |
| /* Save registers on stack */ |
| stmfd sp!, {r4 - r12, lr} |
| |
| /* Drain write buffer */ |
| mov tmp1, #0 |
| mcr p15, 0, tmp1, c7, c10, 4 |
| |
| ldr tmp1, [r0, #PM_DATA_PMC] |
| str tmp1, .pmc_base |
| ldr tmp1, [r0, #PM_DATA_RAMC0] |
| str tmp1, .sramc_base |
| ldr tmp1, [r0, #PM_DATA_RAMC1] |
| str tmp1, .sramc1_base |
| ldr tmp1, [r0, #PM_DATA_MEMCTRL] |
| str tmp1, .memtype |
| ldr tmp1, [r0, #PM_DATA_MODE] |
| str tmp1, .pm_mode |
| /* Both ldrne below are here to preload their address in the TLB */ |
| ldr tmp1, [r0, #PM_DATA_SHDWC] |
| str tmp1, .shdwc |
| cmp tmp1, #0 |
| ldrne tmp2, [tmp1, #0] |
| ldr tmp1, [r0, #PM_DATA_SFRBU] |
| str tmp1, .sfr |
| cmp tmp1, #0 |
| ldrne tmp2, [tmp1, #0x10] |
| |
| /* Active the self-refresh mode */ |
| mov r0, #SRAMC_SELF_FRESH_ACTIVE |
| bl at91_sramc_self_refresh |
| |
| ldr r0, .pm_mode |
| cmp r0, #AT91_PM_STANDBY |
| beq standby |
| cmp r0, #AT91_PM_BACKUP |
| beq backup_mode |
| |
| bl at91_ulp_mode |
| b exit_suspend |
| |
| standby: |
| /* Wait for interrupt */ |
| ldr pmc, .pmc_base |
| at91_cpu_idle |
| b exit_suspend |
| |
| backup_mode: |
| bl at91_backup_mode |
| b exit_suspend |
| |
| exit_suspend: |
| /* Exit the self-refresh mode */ |
| mov r0, #SRAMC_SELF_FRESH_EXIT |
| bl at91_sramc_self_refresh |
| |
| /* Restore registers, and return */ |
| ldmfd sp!, {r4 - r12, pc} |
| ENDPROC(at91_pm_suspend_in_sram) |
| |
| ENTRY(at91_backup_mode) |
| /* Switch the master clock source to slow clock. */ |
| ldr pmc, .pmc_base |
| ldr tmp1, [pmc, #AT91_PMC_MCKR] |
| bic tmp1, tmp1, #AT91_PMC_CSS |
| str tmp1, [pmc, #AT91_PMC_MCKR] |
| |
| wait_mckrdy |
| |
| /*BUMEN*/ |
| ldr r0, .sfr |
| mov tmp1, #0x1 |
| str tmp1, [r0, #0x10] |
| |
| /* Shutdown */ |
| ldr r0, .shdwc |
| mov tmp1, #0xA5000000 |
| add tmp1, tmp1, #0x1 |
| str tmp1, [r0, #0] |
| ENDPROC(at91_backup_mode) |
| |
| .macro at91_pm_ulp0_mode |
| ldr pmc, .pmc_base |
| |
| /* Turn off the crystal oscillator */ |
| ldr tmp1, [pmc, #AT91_CKGR_MOR] |
| bic tmp1, tmp1, #AT91_PMC_MOSCEN |
| orr tmp1, tmp1, #AT91_PMC_KEY |
| str tmp1, [pmc, #AT91_CKGR_MOR] |
| |
| /* Save RC oscillator state */ |
| ldr tmp1, [pmc, #AT91_PMC_SR] |
| str tmp1, .saved_osc_status |
| tst tmp1, #AT91_PMC_MOSCRCS |
| bne 1f |
| |
| /* Turn off RC oscillator */ |
| ldr tmp1, [pmc, #AT91_CKGR_MOR] |
| bic tmp1, tmp1, #AT91_PMC_MOSCRCEN |
| bic tmp1, tmp1, #AT91_PMC_KEY_MASK |
| orr tmp1, tmp1, #AT91_PMC_KEY |
| str tmp1, [pmc, #AT91_CKGR_MOR] |
| |
| /* Wait main RC disabled done */ |
| 2: ldr tmp1, [pmc, #AT91_PMC_SR] |
| tst tmp1, #AT91_PMC_MOSCRCS |
| bne 2b |
| |
| /* Wait for interrupt */ |
| 1: at91_cpu_idle |
| |
| /* Restore RC oscillator state */ |
| ldr tmp1, .saved_osc_status |
| tst tmp1, #AT91_PMC_MOSCRCS |
| beq 4f |
| |
| /* Turn on RC oscillator */ |
| ldr tmp1, [pmc, #AT91_CKGR_MOR] |
| orr tmp1, tmp1, #AT91_PMC_MOSCRCEN |
| bic tmp1, tmp1, #AT91_PMC_KEY_MASK |
| orr tmp1, tmp1, #AT91_PMC_KEY |
| str tmp1, [pmc, #AT91_CKGR_MOR] |
| |
| /* Wait main RC stabilization */ |
| 3: ldr tmp1, [pmc, #AT91_PMC_SR] |
| tst tmp1, #AT91_PMC_MOSCRCS |
| beq 3b |
| |
| /* Turn on the crystal oscillator */ |
| 4: ldr tmp1, [pmc, #AT91_CKGR_MOR] |
| orr tmp1, tmp1, #AT91_PMC_MOSCEN |
| orr tmp1, tmp1, #AT91_PMC_KEY |
| str tmp1, [pmc, #AT91_CKGR_MOR] |
| |
| wait_moscrdy |
| .endm |
| |
| /** |
| * Note: This procedure only applies on the platform which uses |
| * the external crystal oscillator as a main clock source. |
| */ |
| .macro at91_pm_ulp1_mode |
| ldr pmc, .pmc_base |
| |
| /* Save RC oscillator state and check if it is enabled. */ |
| ldr tmp1, [pmc, #AT91_PMC_SR] |
| str tmp1, .saved_osc_status |
| tst tmp1, #AT91_PMC_MOSCRCS |
| bne 2f |
| |
| /* Enable RC oscillator */ |
| ldr tmp1, [pmc, #AT91_CKGR_MOR] |
| orr tmp1, tmp1, #AT91_PMC_MOSCRCEN |
| bic tmp1, tmp1, #AT91_PMC_KEY_MASK |
| orr tmp1, tmp1, #AT91_PMC_KEY |
| str tmp1, [pmc, #AT91_CKGR_MOR] |
| |
| /* Wait main RC stabilization */ |
| 1: ldr tmp1, [pmc, #AT91_PMC_SR] |
| tst tmp1, #AT91_PMC_MOSCRCS |
| beq 1b |
| |
| /* Switch the main clock source to 12-MHz RC oscillator */ |
| 2: ldr tmp1, [pmc, #AT91_CKGR_MOR] |
| bic tmp1, tmp1, #AT91_PMC_MOSCSEL |
| bic tmp1, tmp1, #AT91_PMC_KEY_MASK |
| orr tmp1, tmp1, #AT91_PMC_KEY |
| str tmp1, [pmc, #AT91_CKGR_MOR] |
| |
| wait_moscsels |
| |
| /* Disable the crystal oscillator */ |
| ldr tmp1, [pmc, #AT91_CKGR_MOR] |
| bic tmp1, tmp1, #AT91_PMC_MOSCEN |
| bic tmp1, tmp1, #AT91_PMC_KEY_MASK |
| orr tmp1, tmp1, #AT91_PMC_KEY |
| str tmp1, [pmc, #AT91_CKGR_MOR] |
| |
| /* Switch the master clock source to main clock */ |
| ldr tmp1, [pmc, #AT91_PMC_MCKR] |
| bic tmp1, tmp1, #AT91_PMC_CSS |
| orr tmp1, tmp1, #AT91_PMC_CSS_MAIN |
| str tmp1, [pmc, #AT91_PMC_MCKR] |
| |
| wait_mckrdy |
| |
| /* Enter the ULP1 mode by set WAITMODE bit in CKGR_MOR */ |
| ldr tmp1, [pmc, #AT91_CKGR_MOR] |
| orr tmp1, tmp1, #AT91_PMC_WAITMODE |
| bic tmp1, tmp1, #AT91_PMC_KEY_MASK |
| orr tmp1, tmp1, #AT91_PMC_KEY |
| str tmp1, [pmc, #AT91_CKGR_MOR] |
| |
| wait_mckrdy |
| |
| /* Enable the crystal oscillator */ |
| ldr tmp1, [pmc, #AT91_CKGR_MOR] |
| orr tmp1, tmp1, #AT91_PMC_MOSCEN |
| bic tmp1, tmp1, #AT91_PMC_KEY_MASK |
| orr tmp1, tmp1, #AT91_PMC_KEY |
| str tmp1, [pmc, #AT91_CKGR_MOR] |
| |
| wait_moscrdy |
| |
| /* Switch the master clock source to slow clock */ |
| ldr tmp1, [pmc, #AT91_PMC_MCKR] |
| bic tmp1, tmp1, #AT91_PMC_CSS |
| str tmp1, [pmc, #AT91_PMC_MCKR] |
| |
| wait_mckrdy |
| |
| /* Switch main clock source to crystal oscillator */ |
| ldr tmp1, [pmc, #AT91_CKGR_MOR] |
| orr tmp1, tmp1, #AT91_PMC_MOSCSEL |
| bic tmp1, tmp1, #AT91_PMC_KEY_MASK |
| orr tmp1, tmp1, #AT91_PMC_KEY |
| str tmp1, [pmc, #AT91_CKGR_MOR] |
| |
| wait_moscsels |
| |
| /* Switch the master clock source to main clock */ |
| ldr tmp1, [pmc, #AT91_PMC_MCKR] |
| bic tmp1, tmp1, #AT91_PMC_CSS |
| orr tmp1, tmp1, #AT91_PMC_CSS_MAIN |
| str tmp1, [pmc, #AT91_PMC_MCKR] |
| |
| wait_mckrdy |
| |
| /* Restore RC oscillator state */ |
| ldr tmp1, .saved_osc_status |
| tst tmp1, #AT91_PMC_MOSCRCS |
| bne 3f |
| |
| /* Disable RC oscillator */ |
| ldr tmp1, [pmc, #AT91_CKGR_MOR] |
| bic tmp1, tmp1, #AT91_PMC_MOSCRCEN |
| bic tmp1, tmp1, #AT91_PMC_KEY_MASK |
| orr tmp1, tmp1, #AT91_PMC_KEY |
| str tmp1, [pmc, #AT91_CKGR_MOR] |
| |
| /* Wait RC oscillator disable done */ |
| 4: ldr tmp1, [pmc, #AT91_PMC_SR] |
| tst tmp1, #AT91_PMC_MOSCRCS |
| bne 4b |
| |
| 3: |
| .endm |
| |
| ENTRY(at91_ulp_mode) |
| ldr pmc, .pmc_base |
| |
| /* Save Master clock setting */ |
| ldr tmp1, [pmc, #AT91_PMC_MCKR] |
| str tmp1, .saved_mckr |
| |
| /* |
| * Set the Master clock source to slow clock |
| */ |
| bic tmp1, tmp1, #AT91_PMC_CSS |
| str tmp1, [pmc, #AT91_PMC_MCKR] |
| |
| wait_mckrdy |
| |
| ldr r0, .pm_mode |
| cmp r0, #AT91_PM_ULP1 |
| beq ulp1_mode |
| |
| at91_pm_ulp0_mode |
| b ulp_exit |
| |
| ulp1_mode: |
| at91_pm_ulp1_mode |
| b ulp_exit |
| |
| ulp_exit: |
| ldr pmc, .pmc_base |
| |
| /* |
| * Restore master clock setting |
| */ |
| ldr tmp1, .saved_mckr |
| str tmp1, [pmc, #AT91_PMC_MCKR] |
| |
| wait_mckrdy |
| |
| mov pc, lr |
| ENDPROC(at91_ulp_mode) |
| |
| /* |
| * void at91_sramc_self_refresh(unsigned int is_active) |
| * |
| * @input param: |
| * @r0: 1 - active self-refresh mode |
| * 0 - exit self-refresh mode |
| * register usage: |
| * @r1: memory type |
| * @r2: base address of the sram controller |
| */ |
| |
| ENTRY(at91_sramc_self_refresh) |
| ldr r1, .memtype |
| ldr r2, .sramc_base |
| |
| cmp r1, #AT91_MEMCTRL_MC |
| bne ddrc_sf |
| |
| /* |
| * at91rm9200 Memory controller |
| */ |
| |
| /* |
| * For exiting the self-refresh mode, do nothing, |
| * automatically exit the self-refresh mode. |
| */ |
| tst r0, #SRAMC_SELF_FRESH_ACTIVE |
| beq exit_sramc_sf |
| |
| /* Active SDRAM self-refresh mode */ |
| mov r3, #1 |
| str r3, [r2, #AT91_MC_SDRAMC_SRR] |
| b exit_sramc_sf |
| |
| ddrc_sf: |
| cmp r1, #AT91_MEMCTRL_DDRSDR |
| bne sdramc_sf |
| |
| /* |
| * DDR Memory controller |
| */ |
| tst r0, #SRAMC_SELF_FRESH_ACTIVE |
| beq ddrc_exit_sf |
| |
| /* LPDDR1 --> force DDR2 mode during self-refresh */ |
| ldr r3, [r2, #AT91_DDRSDRC_MDR] |
| str r3, .saved_sam9_mdr |
| bic r3, r3, #~AT91_DDRSDRC_MD |
| cmp r3, #AT91_DDRSDRC_MD_LOW_POWER_DDR |
| ldreq r3, [r2, #AT91_DDRSDRC_MDR] |
| biceq r3, r3, #AT91_DDRSDRC_MD |
| orreq r3, r3, #AT91_DDRSDRC_MD_DDR2 |
| streq r3, [r2, #AT91_DDRSDRC_MDR] |
| |
| /* Active DDRC self-refresh mode */ |
| ldr r3, [r2, #AT91_DDRSDRC_LPR] |
| str r3, .saved_sam9_lpr |
| bic r3, r3, #AT91_DDRSDRC_LPCB |
| orr r3, r3, #AT91_DDRSDRC_LPCB_SELF_REFRESH |
| str r3, [r2, #AT91_DDRSDRC_LPR] |
| |
| /* If using the 2nd ddr controller */ |
| ldr r2, .sramc1_base |
| cmp r2, #0 |
| beq no_2nd_ddrc |
| |
| ldr r3, [r2, #AT91_DDRSDRC_MDR] |
| str r3, .saved_sam9_mdr1 |
| bic r3, r3, #~AT91_DDRSDRC_MD |
| cmp r3, #AT91_DDRSDRC_MD_LOW_POWER_DDR |
| ldreq r3, [r2, #AT91_DDRSDRC_MDR] |
| biceq r3, r3, #AT91_DDRSDRC_MD |
| orreq r3, r3, #AT91_DDRSDRC_MD_DDR2 |
| streq r3, [r2, #AT91_DDRSDRC_MDR] |
| |
| /* Active DDRC self-refresh mode */ |
| ldr r3, [r2, #AT91_DDRSDRC_LPR] |
| str r3, .saved_sam9_lpr1 |
| bic r3, r3, #AT91_DDRSDRC_LPCB |
| orr r3, r3, #AT91_DDRSDRC_LPCB_SELF_REFRESH |
| str r3, [r2, #AT91_DDRSDRC_LPR] |
| |
| no_2nd_ddrc: |
| b exit_sramc_sf |
| |
| ddrc_exit_sf: |
| /* Restore MDR in case of LPDDR1 */ |
| ldr r3, .saved_sam9_mdr |
| str r3, [r2, #AT91_DDRSDRC_MDR] |
| /* Restore LPR on AT91 with DDRAM */ |
| ldr r3, .saved_sam9_lpr |
| str r3, [r2, #AT91_DDRSDRC_LPR] |
| |
| /* If using the 2nd ddr controller */ |
| ldr r2, .sramc1_base |
| cmp r2, #0 |
| ldrne r3, .saved_sam9_mdr1 |
| strne r3, [r2, #AT91_DDRSDRC_MDR] |
| ldrne r3, .saved_sam9_lpr1 |
| strne r3, [r2, #AT91_DDRSDRC_LPR] |
| |
| b exit_sramc_sf |
| |
| /* |
| * SDRAMC Memory controller |
| */ |
| sdramc_sf: |
| tst r0, #SRAMC_SELF_FRESH_ACTIVE |
| beq sdramc_exit_sf |
| |
| /* Active SDRAMC self-refresh mode */ |
| ldr r3, [r2, #AT91_SDRAMC_LPR] |
| str r3, .saved_sam9_lpr |
| bic r3, r3, #AT91_SDRAMC_LPCB |
| orr r3, r3, #AT91_SDRAMC_LPCB_SELF_REFRESH |
| str r3, [r2, #AT91_SDRAMC_LPR] |
| |
| sdramc_exit_sf: |
| ldr r3, .saved_sam9_lpr |
| str r3, [r2, #AT91_SDRAMC_LPR] |
| |
| exit_sramc_sf: |
| mov pc, lr |
| ENDPROC(at91_sramc_self_refresh) |
| |
| .pmc_base: |
| .word 0 |
| .sramc_base: |
| .word 0 |
| .sramc1_base: |
| .word 0 |
| .shdwc: |
| .word 0 |
| .sfr: |
| .word 0 |
| .memtype: |
| .word 0 |
| .pm_mode: |
| .word 0 |
| .saved_mckr: |
| .word 0 |
| .saved_sam9_lpr: |
| .word 0 |
| .saved_sam9_lpr1: |
| .word 0 |
| .saved_sam9_mdr: |
| .word 0 |
| .saved_sam9_mdr1: |
| .word 0 |
| .saved_osc_status: |
| .word 0 |
| |
| ENTRY(at91_pm_suspend_in_sram_sz) |
| .word .-at91_pm_suspend_in_sram |
