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ARM: at91: pm: add support for MCK1..4 save/restore for ulp modes

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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
This commit is contained in:
Claudiu Beznea 2021-04-15 13:49:59 +03:00 committed by Nicolas Ferre
parent f0bbf17958
commit 28eb1d40fe
1 changed files with 126 additions and 0 deletions
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126
arch/arm/mach-at91/pm_suspend.S
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@ -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