ARM: OMAP: SRAM: Move sram-fn.S from plat-omap to mach-omap1

This file is omap1 specific.

Signed-off-by: Tony Lindgren <tony@atomide.com>

2 files changed, 58 insertions, 1 deletions

diff --git a/arch/arm/mach-omap1/Makefile b/arch/arm/mach-omap1/Makefile
index c06f5254c0f3..5e9416e024dd 100644
--- a/arch/arm/mach-omap1/Makefile
+++ b/arch/arm/mach-omap1/Makefile
@@ -3,7 +3,7 @@
 #
 
 # Common support
-obj-y := io.o id.o clock.o irq.o mux.o serial.o devices.o
+obj-y := io.o id.o sram.o clock.o irq.o mux.o serial.o devices.o
 
 obj-$(CONFIG_OMAP_MPU_TIMER)	+= time.o
 obj-$(CONFIG_OMAP_32K_TIMER)	+= timer32k.o
diff --git a/arch/arm/mach-omap1/sram.S b/arch/arm/mach-omap1/sram.S
new file mode 100644
index 000000000000..9e1813c77e05
--- /dev/null
+++ b/arch/arm/mach-omap1/sram.S
@@ -0,0 +1,57 @@
+/*
+ * linux/arch/arm/plat-omap/sram-fn.S
+ *
+ * Functions that need to be run in internal SRAM
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/arch/io.h>
+#include <asm/hardware.h>
+
+	.text
+
+/*
+ * Reprograms ULPD and CKCTL.
+ */
+ENTRY(sram_reprogram_clock)
+	stmfd	sp!, {r0 - r12, lr}		@ save registers on stack
+
+	mov	r2, #IO_ADDRESS(DPLL_CTL) & 0xff000000
+	orr	r2, r2, #IO_ADDRESS(DPLL_CTL) & 0x00ff0000
+	orr	r2, r2, #IO_ADDRESS(DPLL_CTL) & 0x0000ff00
+
+	mov	r3, #IO_ADDRESS(ARM_CKCTL) & 0xff000000
+	orr	r3, r3, #IO_ADDRESS(ARM_CKCTL) & 0x00ff0000
+	orr	r3, r3, #IO_ADDRESS(ARM_CKCTL) & 0x0000ff00
+
+	tst	r0, #1 << 4			@ want lock mode?
+	beq	newck				@ nope
+	bic	r0, r0, #1 << 4			@ else clear lock bit
+	strh	r0, [r2]			@ set dpll into bypass mode
+	orr	r0, r0, #1 << 4			@ set lock bit again
+
+newck:
+	strh	r1, [r3]			@ write new ckctl value
+	strh	r0, [r2]			@ write new dpll value
+
+	mov	r4, #0x0700			@ let the clocks settle
+	orr	r4, r4, #0x00ff
+delay:	sub	r4, r4, #1
+	cmp	r4, #0
+	bne	delay
+
+lock:	ldrh	r4, [r2], #0			@ read back dpll value
+	tst	r0, #1 << 4			@ want lock mode?
+	beq	out				@ nope
+	tst	r4, #1 << 0			@ dpll rate locked?
+	beq	lock				@ try again
+
+out:
+	ldmfd	sp!, {r0 - r12, pc}		@ restore regs and return
+ENTRY(sram_reprogram_clock_sz)
+	.word	. - sram_reprogram_clock