[ARM] 3466/1: [2/3] Support for Philips PNX4008 platform: chip support

Patch from Vitaly Wool

This patch adds basic chip support for PNX4008 ARM platform.
It's basically the same as the previous one, but with the rmk's
comments taken into account.

Signed-off-by: Vitaly Wool <vwool@ru.mvista.com>
Signed-off-by: Dmitry Pervushin <dpervushin@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 196 insertions, 0 deletions

diff --git a/arch/arm/mach-pnx4008/sleep.S b/arch/arm/mach-pnx4008/sleep.S
new file mode 100644
index 000000000000..93c802bac269
--- /dev/null
+++ b/arch/arm/mach-pnx4008/sleep.S
@@ -0,0 +1,196 @@
+/*
+ * linux/arch/arm/mach-pnx4008/sleep.S
+ *
+ * PNX4008 support for STOP mode and SDRAM self-refresh
+ *
+ * Authors: Dmitry Chigirev, Vitaly Wool <source@mvista.com>
+ *
+ * 2005 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/config.h>
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/hardware.h>
+
+#define PWRMAN_VA_BASE IO_ADDRESS(PNX4008_PWRMAN_BASE)
+#define PWR_CTRL_REG_OFFS 0x44
+
+#define SDRAM_CFG_VA_BASE IO_ADDRESS(PNX4008_SDRAM_CFG_BASE)
+#define MPMC_STATUS_REG_OFFS 0x4
+
+		.text
+
+ENTRY(pnx4008_cpu_suspend)
+	@this function should be entered in Direct run mode.
+
+	@ save registers on stack
+	stmfd	sp!, {r0 - r6, lr}
+
+	@ setup Power Manager base address in r4
+	@ and put it's value in r5
+	mov	r4, #(PWRMAN_VA_BASE & 0xff000000)
+	orr	r4, r4, #(PWRMAN_VA_BASE & 0x00ff0000)
+	orr	r4, r4, #(PWRMAN_VA_BASE & 0x0000ff00)
+	orr	r4, r4, #(PWRMAN_VA_BASE & 0x000000ff)
+	ldr	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ setup SDRAM controller base address in r2
+	@ and put it's value in r3
+	mov	r2, #(SDRAM_CFG_VA_BASE & 0xff000000)
+	orr	r2, r2, #(SDRAM_CFG_VA_BASE & 0x00ff0000)
+	orr	r2, r2, #(SDRAM_CFG_VA_BASE & 0x0000ff00)
+	orr	r2, r2, #(SDRAM_CFG_VA_BASE & 0x000000ff)
+	ldr	r3, [r2, #MPMC_STATUS_REG_OFFS] @extra read - HW bug workaround
+
+	@ clear SDRAM self-refresh bit latch
+	and	r5, r5, #(~(1 << 8))
+	@ clear SDRAM self-refresh bit
+	and	r5, r5, #(~(1 << 9))
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ do save current bit settings in r1
+	mov	r1, r5
+
+	@ set SDRAM self-refresh bit
+	orr	r5, r5, #(1 << 9)
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ set SDRAM self-refresh bit latch
+	orr	r5, r5, #(1 << 8)
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ clear SDRAM self-refresh bit latch
+	and	r5, r5, #(~(1 << 8))
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ clear SDRAM self-refresh bit
+	and	r5, r5, #(~(1 << 9))
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ wait for SDRAM to get into self-refresh mode
+2:	ldr	r3, [r2, #MPMC_STATUS_REG_OFFS]
+	tst	r3, #(1 << 2)
+	beq	2b
+
+	@ to prepare SDRAM to get out of self-refresh mode after wakeup
+	orr	r5, r5, #(1 << 7)
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ do enter stop mode
+	orr	r5, r5, #(1 << 0)
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+
+	@ sleeping now...
+
+	@ coming out of STOP mode into Direct Run mode
+	@ clear STOP mode and SDRAM self-refresh bits
+	str	r1, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ wait for SDRAM to get out self-refresh mode
+3:	ldr	r3, [r2, #MPMC_STATUS_REG_OFFS]
+	tst	r3, #5
+	bne	3b
+
+	@ restore regs and return
+	ldmfd   sp!, {r0 - r6, pc}
+
+ENTRY(pnx4008_cpu_suspend_sz)
+	.word	. - pnx4008_cpu_suspend
+
+ENTRY(pnx4008_cpu_standby)
+	@ save registers on stack
+	stmfd	sp!, {r0 - r6, lr}
+
+	@ setup Power Manager base address in r4
+	@ and put it's value in r5
+	mov	r4, #(PWRMAN_VA_BASE & 0xff000000)
+	orr	r4, r4, #(PWRMAN_VA_BASE & 0x00ff0000)
+	orr	r4, r4, #(PWRMAN_VA_BASE & 0x0000ff00)
+	orr	r4, r4, #(PWRMAN_VA_BASE & 0x000000ff)
+	ldr	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ setup SDRAM controller base address in r2
+	@ and put it's value in r3
+	mov	r2, #(SDRAM_CFG_VA_BASE & 0xff000000)
+	orr	r2, r2, #(SDRAM_CFG_VA_BASE & 0x00ff0000)
+	orr	r2, r2, #(SDRAM_CFG_VA_BASE & 0x0000ff00)
+	orr	r2, r2, #(SDRAM_CFG_VA_BASE & 0x000000ff)
+	ldr	r3, [r2, #MPMC_STATUS_REG_OFFS] @extra read - HW bug workaround
+
+	@ clear SDRAM self-refresh bit latch
+	and	r5, r5, #(~(1 << 8))
+	@ clear SDRAM self-refresh bit
+	and	r5, r5, #(~(1 << 9))
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ do save current bit settings in r1
+	mov	r1, r5
+
+	@ set SDRAM self-refresh bit
+	orr	r5, r5, #(1 << 9)
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ set SDRAM self-refresh bit latch
+	orr	r5, r5, #(1 << 8)
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ clear SDRAM self-refresh bit latch
+	and	r5, r5, #(~(1 << 8))
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ clear SDRAM self-refresh bit
+	and	r5, r5, #(~(1 << 9))
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ wait for SDRAM to get into self-refresh mode
+2:	ldr	r3, [r2, #MPMC_STATUS_REG_OFFS]
+	tst	r3, #(1 << 2)
+	beq	2b
+
+	@ set 'get out of self-refresh mode after wakeup' bit
+	orr	r5, r5, #(1 << 7)
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	mcr     p15, 0, r0, c7, c0, 4	@ kinda sleeping now...
+
+	@ set SDRAM self-refresh bit latch
+	orr	r5, r5, #(1 << 8)
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ clear SDRAM self-refresh bit latch
+	and	r5, r5, #(~(1 << 8))
+	str	r5, [r4, #PWR_CTRL_REG_OFFS]
+
+	@ wait for SDRAM to get out self-refresh mode
+3:	ldr	r3, [r2, #MPMC_STATUS_REG_OFFS]
+	tst	r3, #5
+	bne	3b
+
+	@ restore regs and return
+	ldmfd   sp!, {r0 - r6, pc}
+
+ENTRY(pnx4008_cpu_standby_sz)
+	.word	. - pnx4008_cpu_standby
+
+ENTRY(pnx4008_cache_clean_invalidate)
+	stmfd	sp!, {r0 - r6, lr}
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+	mcr	p15, 0, ip, c7, c6, 0		@ invalidate D cache
+#else
+1:	mrc	p15, 0, r15, c7, c14, 3		@ test,clean,invalidate
+	bne     1b
+#endif
+	ldmfd   sp!, {r0 - r6, pc}