summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-at91/pm_slowclock.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-at91/pm_slowclock.S')
-rw-r--r--arch/arm/mach-at91/pm_slowclock.S275
1 files changed, 141 insertions, 134 deletions
diff --git a/arch/arm/mach-at91/pm_slowclock.S b/arch/arm/mach-at91/pm_slowclock.S
index 92dfb84..db54521 100644
--- a/arch/arm/mach-at91/pm_slowclock.S
+++ b/arch/arm/mach-at91/pm_slowclock.S
@@ -15,15 +15,7 @@
#include <linux/linkage.h>
#include <mach/hardware.h>
#include <mach/at91_pmc.h>
-
-#if defined(CONFIG_ARCH_AT91RM9200)
-#include <mach/at91rm9200_mc.h>
-#elif defined(CONFIG_ARCH_AT91CAP9) \
- || defined(CONFIG_ARCH_AT91SAM9G45)
-#include <mach/at91sam9_ddrsdr.h>
-#else
-#include <mach/at91sam9_sdramc.h>
-#endif
+#include <mach/at91_ramc.h>
#ifdef CONFIG_ARCH_AT91SAM9263
@@ -47,17 +39,23 @@
#define PLLALOCK_TIMEOUT 1000
#define PLLBLOCK_TIMEOUT 1000
+pmc .req r0
+sdramc .req r1
+ramc1 .req r2
+memctrl .req r3
+tmp1 .req r4
+tmp2 .req r5
/*
* Wait until master clock is ready (after switching master clock source)
*/
.macro wait_mckrdy
- mov r4, #MCKRDY_TIMEOUT
-1: sub r4, r4, #1
- cmp r4, #0
+ mov tmp2, #MCKRDY_TIMEOUT
+1: sub tmp2, tmp2, #1
+ cmp tmp2, #0
beq 2f
- ldr r3, [r1, #(AT91_PMC_SR - AT91_PMC)]
- tst r3, #AT91_PMC_MCKRDY
+ ldr tmp1, [pmc, #AT91_PMC_SR]
+ tst tmp1, #AT91_PMC_MCKRDY
beq 1b
2:
.endm
@@ -66,12 +64,12 @@
* Wait until master oscillator has stabilized.
*/
.macro wait_moscrdy
- mov r4, #MOSCRDY_TIMEOUT
-1: sub r4, r4, #1
- cmp r4, #0
+ mov tmp2, #MOSCRDY_TIMEOUT
+1: sub tmp2, tmp2, #1
+ cmp tmp2, #0
beq 2f
- ldr r3, [r1, #(AT91_PMC_SR - AT91_PMC)]
- tst r3, #AT91_PMC_MOSCS
+ ldr tmp1, [pmc, #AT91_PMC_SR]
+ tst tmp1, #AT91_PMC_MOSCS
beq 1b
2:
.endm
@@ -80,12 +78,12 @@
* Wait until PLLA has locked.
*/
.macro wait_pllalock
- mov r4, #PLLALOCK_TIMEOUT
-1: sub r4, r4, #1
- cmp r4, #0
+ mov tmp2, #PLLALOCK_TIMEOUT
+1: sub tmp2, tmp2, #1
+ cmp tmp2, #0
beq 2f
- ldr r3, [r1, #(AT91_PMC_SR - AT91_PMC)]
- tst r3, #AT91_PMC_LOCKA
+ ldr tmp1, [pmc, #AT91_PMC_SR]
+ tst tmp1, #AT91_PMC_LOCKA
beq 1b
2:
.endm
@@ -94,80 +92,98 @@
* Wait until PLLB has locked.
*/
.macro wait_pllblock
- mov r4, #PLLBLOCK_TIMEOUT
-1: sub r4, r4, #1
- cmp r4, #0
+ mov tmp2, #PLLBLOCK_TIMEOUT
+1: sub tmp2, tmp2, #1
+ cmp tmp2, #0
beq 2f
- ldr r3, [r1, #(AT91_PMC_SR - AT91_PMC)]
- tst r3, #AT91_PMC_LOCKB
+ ldr tmp1, [pmc, #AT91_PMC_SR]
+ tst tmp1, #AT91_PMC_LOCKB
beq 1b
2:
.endm
.text
+/* void at91_slow_clock(void __iomem *pmc, void __iomem *sdramc,
+ * void __iomem *ramc1, int memctrl)
+ */
ENTRY(at91_slow_clock)
/* Save registers on stack */
- stmfd sp!, {r0 - r12, lr}
+ stmfd sp!, {r4 - r12, lr}
/*
* Register usage:
- * R1 = Base address of AT91_PMC
- * R2 = Base address of RAM Controller (SDRAM, DDRSDR, or AT91_SYS)
- * R3 = temporary register
+ * R0 = Base address of AT91_PMC
+ * R1 = Base address of RAM Controller (SDRAM, DDRSDR, or AT91_SYS)
+ * R2 = Base address of second RAM Controller or 0 if not present
+ * R3 = Memory controller
* R4 = temporary register
- * R5 = Base address of second RAM Controller or 0 if not present
+ * R5 = temporary register
*/
- ldr r1, .at91_va_base_pmc
- ldr r2, .at91_va_base_sdramc
- ldr r5, .at91_va_base_ramc1
/* Drain write buffer */
- mov r0, #0
- mcr p15, 0, r0, c7, c10, 4
+ mov tmp1, #0
+ mcr p15, 0, tmp1, c7, c10, 4
+
+ cmp memctrl, #AT91_MEMCTRL_MC
+ bne ddr_sr_enable
-#ifdef CONFIG_ARCH_AT91RM9200
+ /*
+ * at91rm9200 Memory controller
+ */
/* Put SDRAM in self-refresh mode */
- mov r3, #1
- str r3, [r2, #AT91_SDRAMC_SRR]
-#elif defined(CONFIG_ARCH_AT91CAP9) \
- || defined(CONFIG_ARCH_AT91SAM9G45)
+ mov tmp1, #1
+ str tmp1, [sdramc, #AT91RM9200_SDRAMC_SRR]
+ b sdr_sr_done
+
+ /*
+ * DDRSDR Memory controller
+ */
+ddr_sr_enable:
+ cmp memctrl, #AT91_MEMCTRL_DDRSDR
+ bne sdr_sr_enable
/* prepare for DDRAM self-refresh mode */
- ldr r3, [r2, #AT91_DDRSDRC_LPR]
- str r3, .saved_sam9_lpr
- bic r3, #AT91_DDRSDRC_LPCB
- orr r3, #AT91_DDRSDRC_LPCB_SELF_REFRESH
+ ldr tmp1, [sdramc, #AT91_DDRSDRC_LPR]
+ str tmp1, .saved_sam9_lpr
+ bic tmp1, #AT91_DDRSDRC_LPCB
+ orr tmp1, #AT91_DDRSDRC_LPCB_SELF_REFRESH
/* figure out if we use the second ram controller */
- cmp r5, #0
- ldrne r4, [r5, #AT91_DDRSDRC_LPR]
- strne r4, .saved_sam9_lpr1
- bicne r4, #AT91_DDRSDRC_LPCB
- orrne r4, #AT91_DDRSDRC_LPCB_SELF_REFRESH
+ cmp ramc1, #0
+ ldrne tmp2, [ramc1, #AT91_DDRSDRC_LPR]
+ strne tmp2, .saved_sam9_lpr1
+ bicne tmp2, #AT91_DDRSDRC_LPCB
+ orrne tmp2, #AT91_DDRSDRC_LPCB_SELF_REFRESH
/* Enable DDRAM self-refresh mode */
- str r3, [r2, #AT91_DDRSDRC_LPR]
- strne r4, [r5, #AT91_DDRSDRC_LPR]
-#else
+ str tmp1, [sdramc, #AT91_DDRSDRC_LPR]
+ strne tmp2, [ramc1, #AT91_DDRSDRC_LPR]
+
+ b sdr_sr_done
+
+ /*
+ * SDRAMC Memory controller
+ */
+sdr_sr_enable:
/* Enable SDRAM self-refresh mode */
- ldr r3, [r2, #AT91_SDRAMC_LPR]
- str r3, .saved_sam9_lpr
+ ldr tmp1, [sdramc, #AT91_SDRAMC_LPR]
+ str tmp1, .saved_sam9_lpr
- bic r3, #AT91_SDRAMC_LPCB
- orr r3, #AT91_SDRAMC_LPCB_SELF_REFRESH
- str r3, [r2, #AT91_SDRAMC_LPR]
-#endif
+ bic tmp1, #AT91_SDRAMC_LPCB
+ orr tmp1, #AT91_SDRAMC_LPCB_SELF_REFRESH
+ str tmp1, [sdramc, #AT91_SDRAMC_LPR]
+sdr_sr_done:
/* Save Master clock setting */
- ldr r3, [r1, #(AT91_PMC_MCKR - AT91_PMC)]
- str r3, .saved_mckr
+ ldr tmp1, [pmc, #AT91_PMC_MCKR]
+ str tmp1, .saved_mckr
/*
* Set the Master clock source to slow clock
*/
- bic r3, r3, #AT91_PMC_CSS
- str r3, [r1, #(AT91_PMC_MCKR - AT91_PMC)]
+ bic tmp1, tmp1, #AT91_PMC_CSS
+ str tmp1, [pmc, #AT91_PMC_MCKR]
wait_mckrdy
@@ -177,61 +193,61 @@ ENTRY(at91_slow_clock)
*
* See AT91RM9200 errata #27 and #28 for details.
*/
- mov r3, #0
- str r3, [r1, #(AT91_PMC_MCKR - AT91_PMC)]
+ mov tmp1, #0
+ str tmp1, [pmc, #AT91_PMC_MCKR]
wait_mckrdy
#endif
/* Save PLLA setting and disable it */
- ldr r3, [r1, #(AT91_CKGR_PLLAR - AT91_PMC)]
- str r3, .saved_pllar
+ ldr tmp1, [pmc, #AT91_CKGR_PLLAR]
+ str tmp1, .saved_pllar
- mov r3, #AT91_PMC_PLLCOUNT
- orr r3, r3, #(1 << 29) /* bit 29 always set */
- str r3, [r1, #(AT91_CKGR_PLLAR - AT91_PMC)]
+ mov tmp1, #AT91_PMC_PLLCOUNT
+ orr tmp1, tmp1, #(1 << 29) /* bit 29 always set */
+ str tmp1, [pmc, #AT91_CKGR_PLLAR]
/* Save PLLB setting and disable it */
- ldr r3, [r1, #(AT91_CKGR_PLLBR - AT91_PMC)]
- str r3, .saved_pllbr
+ ldr tmp1, [pmc, #AT91_CKGR_PLLBR]
+ str tmp1, .saved_pllbr
- mov r3, #AT91_PMC_PLLCOUNT
- str r3, [r1, #(AT91_CKGR_PLLBR - AT91_PMC)]
+ mov tmp1, #AT91_PMC_PLLCOUNT
+ str tmp1, [pmc, #AT91_CKGR_PLLBR]
/* Turn off the main oscillator */
- ldr r3, [r1, #(AT91_CKGR_MOR - AT91_PMC)]
- bic r3, r3, #AT91_PMC_MOSCEN
- str r3, [r1, #(AT91_CKGR_MOR - AT91_PMC)]
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ bic tmp1, tmp1, #AT91_PMC_MOSCEN
+ str tmp1, [pmc, #AT91_CKGR_MOR]
/* Wait for interrupt */
- mcr p15, 0, r0, c7, c0, 4
+ mcr p15, 0, tmp1, c7, c0, 4
/* Turn on the main oscillator */
- ldr r3, [r1, #(AT91_CKGR_MOR - AT91_PMC)]
- orr r3, r3, #AT91_PMC_MOSCEN
- str r3, [r1, #(AT91_CKGR_MOR - AT91_PMC)]
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ orr tmp1, tmp1, #AT91_PMC_MOSCEN
+ str tmp1, [pmc, #AT91_CKGR_MOR]
wait_moscrdy
/* Restore PLLB setting */
- ldr r3, .saved_pllbr
- str r3, [r1, #(AT91_CKGR_PLLBR - AT91_PMC)]
+ ldr tmp1, .saved_pllbr
+ str tmp1, [pmc, #AT91_CKGR_PLLBR]
- tst r3, #(AT91_PMC_MUL & 0xff0000)
+ tst tmp1, #(AT91_PMC_MUL & 0xff0000)
bne 1f
- tst r3, #(AT91_PMC_MUL & ~0xff0000)
+ tst tmp1, #(AT91_PMC_MUL & ~0xff0000)
beq 2f
1:
wait_pllblock
2:
/* Restore PLLA setting */
- ldr r3, .saved_pllar
- str r3, [r1, #(AT91_CKGR_PLLAR - AT91_PMC)]
+ ldr tmp1, .saved_pllar
+ str tmp1, [pmc, #AT91_CKGR_PLLAR]
- tst r3, #(AT91_PMC_MUL & 0xff0000)
+ tst tmp1, #(AT91_PMC_MUL & 0xff0000)
bne 3f
- tst r3, #(AT91_PMC_MUL & ~0xff0000)
+ tst tmp1, #(AT91_PMC_MUL & ~0xff0000)
beq 4f
3:
wait_pllalock
@@ -244,11 +260,11 @@ ENTRY(at91_slow_clock)
*
* See AT91RM9200 errata #27 and #28 for details.
*/
- ldr r3, .saved_mckr
- tst r3, #AT91_PMC_PRES
+ ldr tmp1, .saved_mckr
+ tst tmp1, #AT91_PMC_PRES
beq 2f
- and r3, r3, #AT91_PMC_PRES
- str r3, [r1, #(AT91_PMC_MCKR - AT91_PMC)]
+ and tmp1, tmp1, #AT91_PMC_PRES
+ str tmp1, [pmc, #AT91_PMC_MCKR]
wait_mckrdy
#endif
@@ -256,32 +272,45 @@ ENTRY(at91_slow_clock)
/*
* Restore master clock setting
*/
-2: ldr r3, .saved_mckr
- str r3, [r1, #(AT91_PMC_MCKR - AT91_PMC)]
+2: ldr tmp1, .saved_mckr
+ str tmp1, [pmc, #AT91_PMC_MCKR]
wait_mckrdy
-#ifdef CONFIG_ARCH_AT91RM9200
- /* Do nothing - self-refresh is automatically disabled. */
-#elif defined(CONFIG_ARCH_AT91CAP9) \
- || defined(CONFIG_ARCH_AT91SAM9G45)
+ /*
+ * at91rm9200 Memory controller
+ * Do nothing - self-refresh is automatically disabled.
+ */
+ cmp memctrl, #AT91_MEMCTRL_MC
+ beq ram_restored
+
+ /*
+ * DDRSDR Memory controller
+ */
+ cmp memctrl, #AT91_MEMCTRL_DDRSDR
+ bne sdr_en_restore
/* Restore LPR on AT91 with DDRAM */
- ldr r3, .saved_sam9_lpr
- str r3, [r2, #AT91_DDRSDRC_LPR]
+ ldr tmp1, .saved_sam9_lpr
+ str tmp1, [sdramc, #AT91_DDRSDRC_LPR]
/* if we use the second ram controller */
- cmp r5, #0
- ldrne r4, .saved_sam9_lpr1
- strne r4, [r5, #AT91_DDRSDRC_LPR]
+ cmp ramc1, #0
+ ldrne tmp2, .saved_sam9_lpr1
+ strne tmp2, [ramc1, #AT91_DDRSDRC_LPR]
+
+ b ram_restored
-#else
+ /*
+ * SDRAMC Memory controller
+ */
+sdr_en_restore:
/* Restore LPR on AT91 with SDRAM */
- ldr r3, .saved_sam9_lpr
- str r3, [r2, #AT91_SDRAMC_LPR]
-#endif
+ ldr tmp1, .saved_sam9_lpr
+ str tmp1, [sdramc, #AT91_SDRAMC_LPR]
+ram_restored:
/* Restore registers, and return */
- ldmfd sp!, {r0 - r12, pc}
+ ldmfd sp!, {r4 - r12, pc}
.saved_mckr:
@@ -299,27 +328,5 @@ ENTRY(at91_slow_clock)
.saved_sam9_lpr1:
.word 0
-.at91_va_base_pmc:
- .word AT91_VA_BASE_SYS + AT91_PMC
-
-#ifdef CONFIG_ARCH_AT91RM9200
-.at91_va_base_sdramc:
- .word AT91_VA_BASE_SYS
-#elif defined(CONFIG_ARCH_AT91CAP9) \
- || defined(CONFIG_ARCH_AT91SAM9G45)
-.at91_va_base_sdramc:
- .word AT91_VA_BASE_SYS + AT91_DDRSDRC0
-#else
-.at91_va_base_sdramc:
- .word AT91_VA_BASE_SYS + AT91_SDRAMC0
-#endif
-
-.at91_va_base_ramc1:
-#if defined(CONFIG_ARCH_AT91SAM9G45)
- .word AT91_VA_BASE_SYS + AT91_DDRSDRC1
-#else
- .word 0
-#endif
-
ENTRY(at91_slow_clock_sz)
.word .-at91_slow_clock