1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2013-2015 Freescale Semiconductor, Inc.
4 * Copyright 2017-2018 NXP.
5 */
6
7#include <linux/err.h>
8#include <linux/io.h>
9#include <linux/of.h>
10#include <linux/of_address.h>
11#include <linux/mfd/syscon.h>
12#include <linux/regmap.h>
13#include "common.h"
14#include "hardware.h"
15
16#define REG_SET		0x4
17#define REG_CLR		0x8
18
19#define ANADIG_REG_2P5		0x130
20#define ANADIG_REG_CORE		0x140
21#define ANADIG_ANA_MISC0	0x150
22#define ANADIG_DIGPROG		0x260
23#define ANADIG_DIGPROG_IMX6SL	0x280
24#define ANADIG_DIGPROG_IMX7D	0x800
25
26#define SRC_SBMR2		0x1c
27
28#define BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG	0x40000
29#define BM_ANADIG_REG_2P5_ENABLE_PULLDOWN	0x8
30#define BM_ANADIG_REG_CORE_FET_ODRIVE		0x20000000
31#define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG	0x1000
32/* Below MISC0_DISCON_HIGH_SNVS is only for i.MX6SL */
33#define BM_ANADIG_ANA_MISC0_DISCON_HIGH_SNVS	0x2000
34
35static struct regmap *anatop;
36
37static void imx_anatop_enable_weak2p5(bool enable)
38{
39	u32 reg, val;
40
41	regmap_read(anatop, ANADIG_ANA_MISC0, &val);
42
43	/* can only be enabled when stop_mode_config is clear. */
44	reg = ANADIG_REG_2P5;
45	reg += (enable && (val & BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG) == 0) ?
46		REG_SET : REG_CLR;
47	regmap_write(anatop, reg, BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG);
48}
49
50static void imx_anatop_enable_fet_odrive(bool enable)
51{
52	regmap_write(anatop, ANADIG_REG_CORE + (enable ? REG_SET : REG_CLR),
53		BM_ANADIG_REG_CORE_FET_ODRIVE);
54}
55
56static inline void imx_anatop_enable_2p5_pulldown(bool enable)
57{
58	regmap_write(anatop, ANADIG_REG_2P5 + (enable ? REG_SET : REG_CLR),
59		BM_ANADIG_REG_2P5_ENABLE_PULLDOWN);
60}
61
62static inline void imx_anatop_disconnect_high_snvs(bool enable)
63{
64	regmap_write(anatop, ANADIG_ANA_MISC0 + (enable ? REG_SET : REG_CLR),
65		BM_ANADIG_ANA_MISC0_DISCON_HIGH_SNVS);
66}
67
68void imx_anatop_pre_suspend(void)
69{
70	if (imx_mmdc_get_ddr_type() == IMX_DDR_TYPE_LPDDR2)
71		imx_anatop_enable_2p5_pulldown(true);
72	else
73		imx_anatop_enable_weak2p5(true);
74
75	imx_anatop_enable_fet_odrive(true);
76
77	if (cpu_is_imx6sl())
78		imx_anatop_disconnect_high_snvs(true);
79}
80
81void imx_anatop_post_resume(void)
82{
83	if (imx_mmdc_get_ddr_type() == IMX_DDR_TYPE_LPDDR2)
84		imx_anatop_enable_2p5_pulldown(false);
85	else
86		imx_anatop_enable_weak2p5(false);
87
88	imx_anatop_enable_fet_odrive(false);
89
90	if (cpu_is_imx6sl())
91		imx_anatop_disconnect_high_snvs(false);
92}
93
94void __init imx_init_revision_from_anatop(void)
95{
96	struct device_node *np, *src_np;
97	void __iomem *anatop_base;
98	unsigned int revision;
99	u32 digprog;
100	u16 offset = ANADIG_DIGPROG;
101	u8 major_part, minor_part;
102
103	np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
104	anatop_base = of_iomap(np, 0);
105	WARN_ON(!anatop_base);
106	if (of_device_is_compatible(np, "fsl,imx6sl-anatop"))
107		offset = ANADIG_DIGPROG_IMX6SL;
108	if (of_device_is_compatible(np, "fsl,imx7d-anatop"))
109		offset = ANADIG_DIGPROG_IMX7D;
110	digprog = readl_relaxed(anatop_base + offset);
111	iounmap(anatop_base);
112
113	/*
114	 * On i.MX7D digprog value match linux version format, so
115	 * it needn't map again and we can use register value directly.
116	 */
117	if (of_device_is_compatible(np, "fsl,imx7d-anatop")) {
118		revision = digprog & 0xff;
119	} else {
120		/*
121		 * MAJOR: [15:8], the major silicon revison;
122		 * MINOR: [7: 0], the minor silicon revison;
123		 *
124		 * please refer to the i.MX RM for the detailed
125		 * silicon revison bit define.
126		 * format the major part and minor part to match the
127		 * linux kernel soc version format.
128		 */
129		major_part = (digprog >> 8) & 0xf;
130		minor_part = digprog & 0xf;
131		revision = ((major_part + 1) << 4) | minor_part;
132
133		if ((digprog >> 16) == MXC_CPU_IMX6ULL) {
134			void __iomem *src_base;
135			u32 sbmr2;
136
137			src_np = of_find_compatible_node(NULL, NULL,
138						     "fsl,imx6ul-src");
139			src_base = of_iomap(src_np, 0);
140			of_node_put(src_np);
141			WARN_ON(!src_base);
142			sbmr2 = readl_relaxed(src_base + SRC_SBMR2);
143			iounmap(src_base);
144
145			/* src_sbmr2 bit 6 is to identify if it is i.MX6ULZ */
146			if (sbmr2 & (1 << 6)) {
147				digprog &= ~(0xff << 16);
148				digprog |= (MXC_CPU_IMX6ULZ << 16);
149			}
150		}
151	}
152	of_node_put(np);
153
154	mxc_set_cpu_type(digprog >> 16 & 0xff);
155	imx_set_soc_revision(revision);
156}
157
158void __init imx_anatop_init(void)
159{
160	anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
161	if (IS_ERR(anatop))
162		pr_err("%s: failed to find imx6q-anatop regmap!\n", __func__);
163}
164