1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * PXA27x standby mode
4 *
5 * Author: David Burrage
6 *
7 * 2005 (c) MontaVista Software, Inc.
8 */
9
10#include <linux/linkage.h>
11#include <asm/assembler.h>
12
13#include "pxa2xx-regs.h"
14
15		.text
16
17#ifdef CONFIG_PXA27x
18ENTRY(pxa_cpu_standby)
19	ldr	r0, =PSSR
20	mov	r1, #(PSSR_PH | PSSR_STS)
21	mov	r2, #PWRMODE_STANDBY
22	mov	r3, #UNCACHED_PHYS_0	@ Read mem context in.
23	ldr	ip, [r3]
24	b	1f
25
26	.align	5
271:	mcr	p14, 0, r2, c7, c0, 0	@ put the system into Standby
28	str	r1, [r0]		@ make sure PSSR_PH/STS are clear
29	ret	lr
30
31#endif
32
33#ifdef CONFIG_PXA3xx
34
35#define PXA3_MDCNFG		0x0000
36#define PXA3_MDCNFG_DMCEN	(1 << 30)
37#define PXA3_DDR_HCAL		0x0060
38#define PXA3_DDR_HCAL_HCRNG	0x1f
39#define PXA3_DDR_HCAL_HCPROG	(1 << 28)
40#define PXA3_DDR_HCAL_HCEN	(1 << 31)
41#define PXA3_DMCIER		0x0070
42#define PXA3_DMCIER_EDLP	(1 << 29)
43#define PXA3_DMCISR		0x0078
44#define PXA3_RCOMP		0x0100
45#define PXA3_RCOMP_SWEVAL	(1 << 31)
46
47ENTRY(pm_enter_standby_start)
48	mov	r1, #0xf6000000			@ DMEMC_REG_BASE (PXA3_MDCNFG)
49	add	r1, r1, #0x00100000
50
51	/*
52	 * Preload the TLB entry for accessing the dynamic memory
53	 * controller registers.  Note that page table lookups will
54	 * fail until the dynamic memory controller has been
55	 * reinitialised - and that includes MMU page table walks.
56	 * This also means that only the dynamic memory controller
57	 * can be reliably accessed in the code following standby.
58	 */
59	ldr	r2, [r1]			@ Dummy read PXA3_MDCNFG
60
61	mcr	p14, 0, r0, c7, c0, 0
62	.rept	8
63	nop
64	.endr
65
66	ldr	r0, [r1, #PXA3_DDR_HCAL]	@ Clear (and wait for) HCEN
67	bic	r0, r0, #PXA3_DDR_HCAL_HCEN
68	str	r0, [r1, #PXA3_DDR_HCAL]
691:	ldr	r0, [r1, #PXA3_DDR_HCAL]
70	tst	r0, #PXA3_DDR_HCAL_HCEN
71	bne	1b
72
73	ldr	r0, [r1, #PXA3_RCOMP]		@ Initiate RCOMP
74	orr	r0, r0, #PXA3_RCOMP_SWEVAL
75	str	r0, [r1, #PXA3_RCOMP]
76
77	mov	r0, #~0				@ Clear interrupts
78	str	r0, [r1, #PXA3_DMCISR]
79
80	ldr	r0, [r1, #PXA3_DMCIER]		@ set DMIER[EDLP]
81	orr	r0, r0, #PXA3_DMCIER_EDLP
82	str	r0, [r1, #PXA3_DMCIER]
83
84	ldr	r0, [r1, #PXA3_DDR_HCAL]	@ clear HCRNG, set HCPROG, HCEN
85	bic	r0, r0, #PXA3_DDR_HCAL_HCRNG
86	orr	r0, r0, #PXA3_DDR_HCAL_HCEN | PXA3_DDR_HCAL_HCPROG
87	str	r0, [r1, #PXA3_DDR_HCAL]
88
891:	ldr	r0, [r1, #PXA3_DMCISR]
90	tst	r0, #PXA3_DMCIER_EDLP
91	beq	1b
92
93	ldr	r0, [r1, #PXA3_MDCNFG]		@ set PXA3_MDCNFG[DMCEN]
94	orr	r0, r0, #PXA3_MDCNFG_DMCEN
95	str	r0, [r1, #PXA3_MDCNFG]
961:	ldr	r0, [r1, #PXA3_MDCNFG]
97	tst	r0, #PXA3_MDCNFG_DMCEN
98	beq	1b
99
100	ldr	r0, [r1, #PXA3_DDR_HCAL]	@ set PXA3_DDR_HCAL[HCRNG]
101	orr	r0, r0, #2 @ HCRNG
102	str	r0, [r1, #PXA3_DDR_HCAL]
103
104	ldr	r0, [r1, #PXA3_DMCIER]		@ Clear the interrupt
105	bic	r0, r0, #0x20000000
106	str	r0, [r1, #PXA3_DMCIER]
107
108	ret	lr
109ENTRY(pm_enter_standby_end)
110
111#endif
112