Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 215 insertions, 0 deletions

diff --git a/arch/arm/mach-sa1100/sleep.S b/arch/arm/mach-sa1100/sleep.S
new file mode 100644
index 00000000000..2fa1e289d17
--- /dev/null
+++ b/arch/arm/mach-sa1100/sleep.S
@@ -0,0 +1,215 @@
+/*
+ * 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 <asm/hardware.h>
+
+
+
+		.text
+
+
+
+/*
+ * sa1100_cpu_suspend()
+ *
+ * Causes sa11x0 to enter sleep state
+ *
+ */
+
+ENTRY(sa1100_cpu_suspend)
+
+	stmfd	sp!, {r4 - r12, lr}		@ save registers on stack
+
+	@ get coprocessor registers
+	mrc 	p15, 0, r4, c3, c0, 0		@ domain ID
+	mrc 	p15, 0, r5, c2, c0, 0		@ translation table base addr
+	mrc	p15, 0, r6, c13, c0, 0		@ PID
+	mrc 	p15, 0, r7, c1, c0, 0		@ control reg
+
+	@ store them plus current virtual stack ptr on stack
+	mov	r8, sp
+	stmfd	sp!, {r4 - r8}
+
+	@ preserve phys address of stack
+	mov	r0, sp
+	bl	sleep_phys_sp
+	ldr	r1, =sleep_save_sp
+	str	r0, [r1]
+
+	@ clean data cache and invalidate WB
+	bl	v4wb_flush_kern_cache_all
+
+	@ disable clock switching
+	mcr	p15, 0, r1, c15, c2, 2
+
+        @ Adjust memory timing before lowering CPU clock
+	@ Clock speed adjustment without changing memory timing makes
+	@ CPU hang in some cases
+        ldr     r0, =MDREFR
+        ldr     r1, [r0]
+        orr     r1, r1, #MDREFR_K1DB2
+        str     r1, [r0]
+
+	@ delay 90us and set CPU PLL to lowest speed
+	@ fixes resume problem on high speed SA1110
+	mov	r0, #90
+	bl	__udelay
+	ldr	r0, =PPCR
+	mov	r1, #0
+	str	r1, [r0]
+	mov	r0, #90
+	bl	__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     r6, =MDREFR
+
+        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
+
+/*
+ * cpu_sa1100_resume()
+ *
+ * entry point from bootloader into kernel during resume
+ *
+ * Note: Yes, part of the following code is located into the .data section.
+ *       This is to allow sleep_save_sp to be accessed with a relative load
+ *       while we can't rely on any MMU translation.  We could have put
+ *       sleep_save_sp in the .text section as well, but some setups might
+ *       insist on it to be truly read-only.
+ */
+
+	.data
+	.align 5
+ENTRY(sa1100_cpu_resume)
+	mov	r0, #PSR_F_BIT | PSR_I_BIT | MODE_SVC
+	msr	cpsr_c, r0			@ set SVC, irqs off
+
+	ldr	r0, sleep_save_sp		@ stack phys addr
+	ldr	r2, =resume_after_mmu		@ its absolute virtual address
+	ldmfd	r0, {r4 - r7, sp}		@ CP regs + virt stack ptr
+
+	mov	r1, #0
+	mcr	p15, 0, r1, c8, c7, 0   	@ flush I+D TLBs
+	mcr	p15, 0, r1, c7, c7, 0		@ flush I&D cache
+	mcr	p15, 0, r1, c9, c0, 0		@ invalidate RB
+	mcr     p15, 0, r1, c9, c0, 5		@ allow user space to use RB
+
+	mcr 	p15, 0, r4, c3, c0, 0		@ domain ID
+	mcr 	p15, 0, r5, c2, c0, 0		@ translation table base addr
+	mcr	p15, 0, r6, c13, c0, 0		@ PID
+	b	resume_turn_on_mmu		@ cache align execution
+
+	.align 5
+resume_turn_on_mmu:
+	mcr 	p15, 0, r7, c1, c0, 0		@ turn on MMU, caches, etc.
+	nop
+	mov	pc, r2				@ jump to virtual addr
+	nop
+	nop
+	nop
+
+sleep_save_sp:
+	.word	0				@ preserve stack phys ptr here
+
+	.text
+resume_after_mmu:
+	mcr     p15, 0, r1, c15, c1, 2		@ enable clock switching
+	ldmfd	sp!, {r4 - r12, pc}		@ return to caller
+
+