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OMAP3 SRAM: convert SRAM code to use macros rather than magic numbers

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Convert omap3_sram_configure_core_dpll() to use macros rather than
magic numbers.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Paul Walmsley 2009-06-19 19:08:28 -06:00 committed by paul
parent 4267b5d152
commit df14e4747a
1 changed files with 38 additions and 15 deletions
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53
arch/arm/mach-omap2/sram34xx.S
View file

@ -36,6 +36,29 @@
.text
/* r4 parameters */
#define SDRC_NO_UNLOCK_DLL 0x0
#define SDRC_UNLOCK_DLL 0x1
/* SDRC_DLLA_CTRL bit settings */
#define DLLIDLE_MASK 0x4
/* SDRC_DLLA_STATUS bit settings */
#define LOCKSTATUS_MASK 0x4
/* SDRC_POWER bit settings */
#define SRFRONIDLEREQ_MASK 0x40
#define PWDENA_MASK 0x4
/* CM_IDLEST1_CORE bit settings */
#define ST_SDRC_MASK 0x2
/* CM_ICLKEN1_CORE bit settings */
#define EN_SDRC_MASK 0x2
/* CM_CLKSEL1_PLL bit settings */
#define CORE_DPLL_CLKOUT_DIV_SHIFT 0x1b
/*
* omap3_sram_configure_core_dpll - change DPLL3 M2 divider
* r0 = new SDRC_RFR_CTRL register contents
@ -57,13 +80,13 @@ ENTRY(omap3_sram_configure_core_dpll)
dsb @ flush buffered writes to interconnect
cmp r3, #0x2 @ if increasing SDRC clk rate,
blne configure_sdrc @ program the SDRC regs early (for RFR)
cmp r4, #0x1 @ set the intended DLL state
cmp r4, #SDRC_UNLOCK_DLL @ set the intended DLL state
bleq unlock_dll
blne lock_dll
bl sdram_in_selfrefresh @ put SDRAM in self refresh, idle SDRC
bl configure_core_dpll @ change the DPLL3 M2 divider
bl enable_sdrc @ take SDRC out of idle
cmp r4, #0x1 @ wait for DLL status to change
cmp r4, #SDRC_UNLOCK_DLL @ wait for DLL status to change
bleq wait_dll_unlock
blne wait_dll_lock
cmp r3, #0x1 @ if increasing SDRC clk rate,
@ -78,33 +101,33 @@ return_to_sdram:
unlock_dll:
ldr r11, omap3_sdrc_dlla_ctrl
ldr r12, [r11]
orr r12, r12, #0x4
orr r12, r12, #DLLIDLE_MASK
str r12, [r11] @ (no OCP barrier needed)
bx lr
lock_dll:
ldr r11, omap3_sdrc_dlla_ctrl
ldr r12, [r11]
bic r12, r12, #0x4
bic r12, r12, #DLLIDLE_MASK
str r12, [r11] @ (no OCP barrier needed)
bx lr
sdram_in_selfrefresh:
ldr r11, omap3_sdrc_power @ read the SDRC_POWER register
ldr r12, [r11] @ read the contents of SDRC_POWER
mov r9, r12 @ keep a copy of SDRC_POWER bits
orr r12, r12, #0x40 @ enable self refresh on idle req
bic r12, r12, #0x4 @ clear PWDENA
orr r12, r12, #SRFRONIDLEREQ_MASK @ enable self refresh on idle
bic r12, r12, #PWDENA_MASK @ clear PWDENA
str r12, [r11] @ write back to SDRC_POWER register
ldr r12, [r11] @ posted-write barrier for SDRC
idle_sdrc:
ldr r11, omap3_cm_iclken1_core @ read the CM_ICLKEN1_CORE reg
ldr r12, [r11]
bic r12, r12, #0x2 @ disable iclk bit for SDRC
bic r12, r12, #EN_SDRC_MASK @ disable iclk bit for SDRC
str r12, [r11]
wait_sdrc_idle:
ldr r11, omap3_cm_idlest1_core
ldr r12, [r11]
and r12, r12, #0x2 @ check for SDRC idle
cmp r12, #2
and r12, r12, #ST_SDRC_MASK @ check for SDRC idle
cmp r12, #ST_SDRC_MASK
bne wait_sdrc_idle
bx lr
configure_core_dpll:
@ -112,7 +135,7 @@ configure_core_dpll:
ldr r12, [r11]
ldr r10, core_m2_mask_val @ modify m2 for core dpll
and r12, r12, r10
orr r12, r12, r3, lsl #0x1B @ r3 contains the M2 val
orr r12, r12, r3, lsl #CORE_DPLL_CLKOUT_DIV_SHIFT
str r12, [r11]
ldr r12, [r11] @ posted-write barrier for CM
bx lr
@ -123,12 +146,12 @@ wait_clk_stable:
enable_sdrc:
ldr r11, omap3_cm_iclken1_core
ldr r12, [r11]
orr r12, r12, #0x2 @ enable iclk bit for SDRC
orr r12, r12, #EN_SDRC_MASK @ enable iclk bit for SDRC
str r12, [r11]
wait_sdrc_idle1:
ldr r11, omap3_cm_idlest1_core
ldr r12, [r11]
and r12, r12, #0x2
and r12, r12, #ST_SDRC_MASK
cmp r12, #0
bne wait_sdrc_idle1
restore_sdrc_power_val:
@ -138,14 +161,14 @@ restore_sdrc_power_val:
wait_dll_lock:
ldr r11, omap3_sdrc_dlla_status
ldr r12, [r11]
and r12, r12, #0x4
cmp r12, #0x4
and r12, r12, #LOCKSTATUS_MASK
cmp r12, #LOCKSTATUS_MASK
bne wait_dll_lock
bx lr
wait_dll_unlock:
ldr r11, omap3_sdrc_dlla_status
ldr r12, [r11]
and r12, r12, #0x4
and r12, r12, #LOCKSTATUS_MASK
cmp r12, #0x0
bne wait_dll_unlock
bx lr