1 files changed, 111 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/standby.S b/arch/arm/mach-pxa/standby.S
new file mode 100644
index 0000000000..ad32b9c0eb
--- /dev/null
+++ b/arch/arm/mach-pxa/standby.S
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * PXA27x standby mode
+ *
+ * Author: David Burrage
+ *
+ * 2005 (c) MontaVista Software, Inc.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+#include "pxa2xx-regs.h"
+
+		.text
+
+#ifdef CONFIG_PXA27x
+ENTRY(pxa_cpu_standby)
+	ldr	r0, =PSSR
+	mov	r1, #(PSSR_PH | PSSR_STS)
+	mov	r2, #PWRMODE_STANDBY
+	mov	r3, #UNCACHED_PHYS_0	@ Read mem context in.
+	ldr	ip, [r3]
+	b	1f
+
+	.align	5
+1:	mcr	p14, 0, r2, c7, c0, 0	@ put the system into Standby
+	str	r1, [r0]		@ make sure PSSR_PH/STS are clear
+	ret	lr
+
+#endif
+
+#ifdef CONFIG_PXA3xx
+
+#define PXA3_MDCNFG		0x0000
+#define PXA3_MDCNFG_DMCEN	(1 << 30)
+#define PXA3_DDR_HCAL		0x0060
+#define PXA3_DDR_HCAL_HCRNG	0x1f
+#define PXA3_DDR_HCAL_HCPROG	(1 << 28)
+#define PXA3_DDR_HCAL_HCEN	(1 << 31)
+#define PXA3_DMCIER		0x0070
+#define PXA3_DMCIER_EDLP	(1 << 29)
+#define PXA3_DMCISR		0x0078
+#define PXA3_RCOMP		0x0100
+#define PXA3_RCOMP_SWEVAL	(1 << 31)
+
+ENTRY(pm_enter_standby_start)
+	mov	r1, #0xf6000000			@ DMEMC_REG_BASE (PXA3_MDCNFG)
+	add	r1, r1, #0x00100000
+
+	/*
+	 * Preload the TLB entry for accessing the dynamic memory
+	 * controller registers.  Note that page table lookups will
+	 * fail until the dynamic memory controller has been
+	 * reinitialised - and that includes MMU page table walks.
+	 * This also means that only the dynamic memory controller
+	 * can be reliably accessed in the code following standby.
+	 */
+	ldr	r2, [r1]			@ Dummy read PXA3_MDCNFG
+
+	mcr	p14, 0, r0, c7, c0, 0
+	.rept	8
+	nop
+	.endr
+
+	ldr	r0, [r1, #PXA3_DDR_HCAL]	@ Clear (and wait for) HCEN
+	bic	r0, r0, #PXA3_DDR_HCAL_HCEN
+	str	r0, [r1, #PXA3_DDR_HCAL]
+1:	ldr	r0, [r1, #PXA3_DDR_HCAL]
+	tst	r0, #PXA3_DDR_HCAL_HCEN
+	bne	1b
+
+	ldr	r0, [r1, #PXA3_RCOMP]		@ Initiate RCOMP
+	orr	r0, r0, #PXA3_RCOMP_SWEVAL
+	str	r0, [r1, #PXA3_RCOMP]
+
+	mov	r0, #~0				@ Clear interrupts
+	str	r0, [r1, #PXA3_DMCISR]
+
+	ldr	r0, [r1, #PXA3_DMCIER]		@ set DMIER[EDLP]
+	orr	r0, r0, #PXA3_DMCIER_EDLP
+	str	r0, [r1, #PXA3_DMCIER]
+
+	ldr	r0, [r1, #PXA3_DDR_HCAL]	@ clear HCRNG, set HCPROG, HCEN
+	bic	r0, r0, #PXA3_DDR_HCAL_HCRNG
+	orr	r0, r0, #PXA3_DDR_HCAL_HCEN | PXA3_DDR_HCAL_HCPROG
+	str	r0, [r1, #PXA3_DDR_HCAL]
+
+1:	ldr	r0, [r1, #PXA3_DMCISR]
+	tst	r0, #PXA3_DMCIER_EDLP
+	beq	1b
+
+	ldr	r0, [r1, #PXA3_MDCNFG]		@ set PXA3_MDCNFG[DMCEN]
+	orr	r0, r0, #PXA3_MDCNFG_DMCEN
+	str	r0, [r1, #PXA3_MDCNFG]
+1:	ldr	r0, [r1, #PXA3_MDCNFG]
+	tst	r0, #PXA3_MDCNFG_DMCEN
+	beq	1b
+
+	ldr	r0, [r1, #PXA3_DDR_HCAL]	@ set PXA3_DDR_HCAL[HCRNG]
+	orr	r0, r0, #2 @ HCRNG
+	str	r0, [r1, #PXA3_DDR_HCAL]
+
+	ldr	r0, [r1, #PXA3_DMCIER]		@ Clear the interrupt
+	bic	r0, r0, #0x20000000
+	str	r0, [r1, #PXA3_DMCIER]
+
+	ret	lr
+ENTRY(pm_enter_standby_end)
+
+#endif