diff options
Diffstat (limited to 'target/linux/at91/patches-5.10/209-ARM-at91-pm-add-support-for-MCK1.4-save-restore-for-.patch')
| -rw-r--r-- | target/linux/at91/patches-5.10/209-ARM-at91-pm-add-support-for-MCK1.4-save-restore-for-.patch | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/target/linux/at91/patches-5.10/209-ARM-at91-pm-add-support-for-MCK1.4-save-restore-for-.patch b/target/linux/at91/patches-5.10/209-ARM-at91-pm-add-support-for-MCK1.4-save-restore-for-.patch new file mode 100644 index 0000000000..96f7811603 --- /dev/null +++ b/target/linux/at91/patches-5.10/209-ARM-at91-pm-add-support-for-MCK1.4-save-restore-for-.patch @@ -0,0 +1,170 @@ +From 9ee7fd7aa956671727752dac6bd131cf511c1137 Mon Sep 17 00:00:00 2001 +From: Claudiu Beznea <claudiu.beznea@microchip.com> +Date: Thu, 15 Apr 2021 13:49:59 +0300 +Subject: [PATCH 209/247] ARM: at91: pm: add support for MCK1..4 save/restore + for ulp modes + +Add support for MCK1..4 save restore for ULP modes. + +Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> +Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com> +Link: https://lore.kernel.org/r/20210415105010.569620-14-claudiu.beznea@microchip.com +--- + arch/arm/mach-at91/pm_suspend.S | 126 ++++++++++++++++++++++++++++++++ + 1 file changed, 126 insertions(+) + +diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S +index 84418120ba67..8b0b8619ee8a 100644 +--- a/arch/arm/mach-at91/pm_suspend.S ++++ b/arch/arm/mach-at91/pm_suspend.S +@@ -765,7 +765,122 @@ sr_dis_exit: + 2: + .endm + ++/** ++ * at91_mckx_ps_enable: save MCK1..4 settings and switch it to main clock ++ * ++ * Side effects: overwrites tmp1, tmp2 ++ */ ++.macro at91_mckx_ps_enable ++#ifdef CONFIG_SOC_SAMA7 ++ ldr pmc, .pmc_base ++ ++ /* There are 4 MCKs we need to handle: MCK1..4 */ ++ mov tmp1, #1 ++e_loop: cmp tmp1, #5 ++ beq e_done ++ ++ /* Write MCK ID to retrieve the settings. */ ++ str tmp1, [pmc, #AT91_PMC_MCR_V2] ++ ldr tmp2, [pmc, #AT91_PMC_MCR_V2] ++ ++e_save_mck1: ++ cmp tmp1, #1 ++ bne e_save_mck2 ++ str tmp2, .saved_mck1 ++ b e_ps ++ ++e_save_mck2: ++ cmp tmp1, #2 ++ bne e_save_mck3 ++ str tmp2, .saved_mck2 ++ b e_ps ++ ++e_save_mck3: ++ cmp tmp1, #3 ++ bne e_save_mck4 ++ str tmp2, .saved_mck3 ++ b e_ps ++ ++e_save_mck4: ++ str tmp2, .saved_mck4 ++ ++e_ps: ++ /* Use CSS=MAINCK and DIV=1. */ ++ bic tmp2, tmp2, #AT91_PMC_MCR_V2_CSS ++ bic tmp2, tmp2, #AT91_PMC_MCR_V2_DIV ++ orr tmp2, tmp2, #AT91_PMC_MCR_V2_CSS_MAINCK ++ orr tmp2, tmp2, #AT91_PMC_MCR_V2_DIV1 ++ str tmp2, [pmc, #AT91_PMC_MCR_V2] ++ ++ wait_mckrdy tmp1 ++ ++ add tmp1, tmp1, #1 ++ b e_loop ++ ++e_done: ++#endif ++.endm ++ ++/** ++ * at91_mckx_ps_restore: restore MCK1..4 settings ++ * ++ * Side effects: overwrites tmp1, tmp2 ++ */ ++.macro at91_mckx_ps_restore ++#ifdef CONFIG_SOC_SAMA7 ++ ldr pmc, .pmc_base ++ ++ /* There are 4 MCKs we need to handle: MCK1..4 */ ++ mov tmp1, #1 ++r_loop: cmp tmp1, #5 ++ beq r_done ++ ++r_save_mck1: ++ cmp tmp1, #1 ++ bne r_save_mck2 ++ ldr tmp2, .saved_mck1 ++ b r_ps ++ ++r_save_mck2: ++ cmp tmp1, #2 ++ bne r_save_mck3 ++ ldr tmp2, .saved_mck2 ++ b r_ps ++ ++r_save_mck3: ++ cmp tmp1, #3 ++ bne r_save_mck4 ++ ldr tmp2, .saved_mck3 ++ b r_ps ++ ++r_save_mck4: ++ ldr tmp2, .saved_mck4 ++ ++r_ps: ++ /* Write MCK ID to retrieve the settings. */ ++ str tmp1, [pmc, #AT91_PMC_MCR_V2] ++ ldr tmp3, [pmc, #AT91_PMC_MCR_V2] ++ ++ /* We need to restore CSS and DIV. */ ++ bic tmp3, tmp3, #AT91_PMC_MCR_V2_CSS ++ bic tmp3, tmp3, #AT91_PMC_MCR_V2_DIV ++ orr tmp3, tmp3, tmp2 ++ bic tmp3, tmp3, #AT91_PMC_MCR_V2_ID_MSK ++ orr tmp3, tmp3, tmp1 ++ orr tmp3, tmp3, #AT91_PMC_MCR_V2_CMD ++ str tmp2, [pmc, #AT91_PMC_MCR_V2] ++ ++ wait_mckrdy tmp1 ++ ++ add tmp1, tmp1, #1 ++ b r_loop ++r_done: ++#endif ++.endm ++ + .macro at91_ulp_mode ++ at91_mckx_ps_enable ++ + ldr pmc, .pmc_base + ldr tmp2, .mckr_offset + ldr tmp3, .pm_mode +@@ -817,6 +932,7 @@ ulp_exit: + mov tmp3, #0 + wait_mckrdy tmp3 + ++ at91_mckx_ps_restore + .endm + + .macro at91_backup_mode +@@ -946,6 +1062,16 @@ ENDPROC(at91_pm_suspend_in_sram) + .word 0 + .saved_osc_status: + .word 0 ++#ifdef CONFIG_SOC_SAMA7 ++.saved_mck1: ++ .word 0 ++.saved_mck2: ++ .word 0 ++.saved_mck3: ++ .word 0 ++.saved_mck4: ++ .word 0 ++#endif + + ENTRY(at91_pm_suspend_in_sram_sz) + .word .-at91_pm_suspend_in_sram +-- +2.32.0 + |