Initial import

1 files changed, 143 insertions, 0 deletions

diff --git a/arch/arm/mach-sa1100/sleep.S b/arch/arm/mach-sa1100/sleep.S
new file mode 100644
index 000000000..85863741e
--- /dev/null
+++ b/arch/arm/mach-sa1100/sleep.S
@@ -0,0 +1,143 @@
+/*
+ * SA11x0 Assembler Sleep/WakeUp Management Routines
+ *
+ * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License.
+ *
+ * History:
+ *
+ * 2001-02-06: Cliff Brake         Initial code
+ *
+ * 2001-08-29:	Nicolas Pitre	Simplified.
+ *
+ * 2002-05-27:	Nicolas Pitre	Revisited, more cleanup and simplification.
+ *				Storage is on the stack now.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <mach/hardware.h>
+
+		.text
+/*
+ * sa1100_finish_suspend()
+ *
+ * Causes sa11x0 to enter sleep state
+ *
+ * Must be aligned to a cacheline.
+ */
+	.balign	32
+ENTRY(sa1100_finish_suspend)
+	@ disable clock switching
+	mcr	p15, 0, r1, c15, c2, 2
+
+	ldr	r6, =MDREFR
+	ldr	r4, [r6]
+	orr     r4, r4, #MDREFR_K1DB2
+	ldr	r5, =PPCR
+
+	@ Pre-load __loop_udelay into the I-cache
+	mov	r0, #1
+	bl	__loop_udelay
+	mov	r0, r0
+
+	@ The following must all exist in a single cache line to
+	@ avoid accessing memory until this sequence is complete,
+	@ otherwise we occasionally hang.
+
+	@ Adjust memory timing before lowering CPU clock
+	str     r4, [r6]
+
+	@ delay 90us and set CPU PLL to lowest speed
+	@ fixes resume problem on high speed SA1110
+	mov	r0, #90
+	bl	__loop_udelay
+	mov	r1, #0
+	str	r1, [r5]
+	mov	r0, #90
+	bl	__loop_udelay
+
+	/*
+	 * SA1110 SDRAM controller workaround.  register values:
+	 *
+	 * r0  = &MSC0
+	 * r1  = &MSC1
+	 * r2  = &MSC2
+	 * r3  = MSC0 value
+	 * r4  = MSC1 value
+	 * r5  = MSC2 value
+	 * r6  = &MDREFR
+	 * r7  = first MDREFR value
+	 * r8  = second MDREFR value
+	 * r9  = &MDCNFG
+	 * r10 = MDCNFG value
+	 * r11 = third MDREFR value
+	 * r12 = &PMCR
+	 * r13 = PMCR value (1)
+	 */
+
+	ldr	r0, =MSC0
+	ldr	r1, =MSC1
+	ldr	r2, =MSC2
+
+	ldr	r3, [r0]
+	bic	r3, r3, #FMsk(MSC_RT)
+	bic	r3, r3, #FMsk(MSC_RT)<<16
+
+	ldr	r4, [r1]
+	bic	r4, r4, #FMsk(MSC_RT)
+	bic	r4, r4, #FMsk(MSC_RT)<<16
+
+	ldr	r5, [r2]
+	bic	r5, r5, #FMsk(MSC_RT)
+	bic	r5, r5, #FMsk(MSC_RT)<<16
+
+	ldr	r7, [r6]
+	bic	r7, r7, #0x0000FF00
+	bic	r7, r7, #0x000000F0
+	orr	r8, r7, #MDREFR_SLFRSH
+
+	ldr	r9, =MDCNFG
+	ldr	r10, [r9]
+	bic	r10, r10, #(MDCNFG_DE0+MDCNFG_DE1)
+	bic	r10, r10, #(MDCNFG_DE2+MDCNFG_DE3)
+
+	bic	r11, r8, #MDREFR_SLFRSH
+	bic	r11, r11, #MDREFR_E1PIN
+
+	ldr	r12, =PMCR
+
+	mov	r13, #PMCR_SF
+
+	b	sa1110_sdram_controller_fix
+
+	.align 5
+sa1110_sdram_controller_fix:
+
+	@ Step 1 clear RT field of all MSCx registers
+	str 	r3, [r0]
+	str	r4, [r1]
+	str	r5, [r2]
+
+	@ Step 2 clear DRI field in MDREFR
+	str	r7, [r6]
+
+	@ Step 3 set SLFRSH bit in MDREFR
+	str	r8, [r6]
+
+	@ Step 4 clear DE bis in MDCNFG
+	str	r10, [r9]
+
+	@ Step 5 clear DRAM refresh control register
+	str	r11, [r6]
+
+	@ Wow, now the hardware suspend request pins can be used, that makes them functional for
+	@ about 7 ns out of the	entire time that the CPU is running!
+
+	@ Step 6 set force sleep bit in PMCR
+
+	str	r13, [r12]
+
+20:	b	20b			@ loop waiting for sleep