1// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
  2/*
  3 * Copyright (c) 2019 Amlogic, Inc.
  4 * Author: Jianxin Pan <jianxin.pan@amlogic.com>
  5 */
  6
  7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  8
  9#include <linux/io.h>
 10#include <linux/of_device.h>
 11#include <linux/platform_device.h>
 12#include <linux/pm_domain.h>
 13#include <dt-bindings/power/meson-a1-power.h>
 14#include <linux/arm-smccc.h>
 15#include <linux/firmware/meson/meson_sm.h>
 16#include <linux/module.h>
 17
 18#define PWRC_ON		1
 19#define PWRC_OFF	0
 20
 21struct meson_secure_pwrc_domain {
 22	struct generic_pm_domain base;
 23	unsigned int index;
 24	struct meson_secure_pwrc *pwrc;
 25};
 26
 27struct meson_secure_pwrc {
 28	struct meson_secure_pwrc_domain *domains;
 29	struct genpd_onecell_data xlate;
 30	struct meson_sm_firmware *fw;
 31};
 32
 33struct meson_secure_pwrc_domain_desc {
 34	unsigned int index;
 35	unsigned int flags;
 36	char *name;
 37	bool (*is_off)(struct meson_secure_pwrc_domain *pwrc_domain);
 38};
 39
 40struct meson_secure_pwrc_domain_data {
 41	unsigned int count;
 42	struct meson_secure_pwrc_domain_desc *domains;
 43};
 44
 45static bool pwrc_secure_is_off(struct meson_secure_pwrc_domain *pwrc_domain)
 46{
 47	int is_off = 1;
 48
 49	if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_GET, &is_off,
 50			  pwrc_domain->index, 0, 0, 0, 0) < 0)
 51		pr_err("failed to get power domain status\n");
 52
 53	return is_off;
 54}
 55
 56static int meson_secure_pwrc_off(struct generic_pm_domain *domain)
 57{
 58	int ret = 0;
 59	struct meson_secure_pwrc_domain *pwrc_domain =
 60		container_of(domain, struct meson_secure_pwrc_domain, base);
 61
 62	if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
 63			  pwrc_domain->index, PWRC_OFF, 0, 0, 0) < 0) {
 64		pr_err("failed to set power domain off\n");
 65		ret = -EINVAL;
 66	}
 67
 68	return ret;
 69}
 70
 71static int meson_secure_pwrc_on(struct generic_pm_domain *domain)
 72{
 73	int ret = 0;
 74	struct meson_secure_pwrc_domain *pwrc_domain =
 75		container_of(domain, struct meson_secure_pwrc_domain, base);
 76
 77	if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
 78			  pwrc_domain->index, PWRC_ON, 0, 0, 0) < 0) {
 79		pr_err("failed to set power domain on\n");
 80		ret = -EINVAL;
 81	}
 82
 83	return ret;
 84}
 85
 86#define SEC_PD(__name, __flag)			\
 87[PWRC_##__name##_ID] =				\
 88{						\
 89	.name = #__name,			\
 90	.index = PWRC_##__name##_ID,		\
 91	.is_off = pwrc_secure_is_off,	\
 92	.flags = __flag,			\
 93}
 94
 95static struct meson_secure_pwrc_domain_desc a1_pwrc_domains[] = {
 96	SEC_PD(DSPA,	0),
 97	SEC_PD(DSPB,	0),
 98	/* UART should keep working in ATF after suspend and before resume */
 99	SEC_PD(UART,	GENPD_FLAG_ALWAYS_ON),
100	/* DMC is for DDR PHY ana/dig and DMC, and should be always on */
101	SEC_PD(DMC,	GENPD_FLAG_ALWAYS_ON),
102	SEC_PD(I2C,	0),
103	SEC_PD(PSRAM,	0),
104	SEC_PD(ACODEC,	0),
105	SEC_PD(AUDIO,	0),
106	SEC_PD(OTP,	0),
107	SEC_PD(DMA,	0),
108	SEC_PD(SD_EMMC,	0),
109	SEC_PD(RAMA,	0),
110	/* SRAMB is used as ATF runtime memory, and should be always on */
111	SEC_PD(RAMB,	GENPD_FLAG_ALWAYS_ON),
112	SEC_PD(IR,	0),
113	SEC_PD(SPICC,	0),
114	SEC_PD(SPIFC,	0),
115	SEC_PD(USB,	0),
116	/* NIC is for the Arm NIC-400 interconnect, and should be always on */
117	SEC_PD(NIC,	GENPD_FLAG_ALWAYS_ON),
118	SEC_PD(PDMIN,	0),
119	SEC_PD(RSA,	0),
120};
121
122static int meson_secure_pwrc_probe(struct platform_device *pdev)
123{
124	int i;
125	struct device_node *sm_np;
126	struct meson_secure_pwrc *pwrc;
127	const struct meson_secure_pwrc_domain_data *match;
128
129	match = of_device_get_match_data(&pdev->dev);
130	if (!match) {
131		dev_err(&pdev->dev, "failed to get match data\n");
132		return -ENODEV;
133	}
134
135	sm_np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gxbb-sm");
136	if (!sm_np) {
137		dev_err(&pdev->dev, "no secure-monitor node\n");
138		return -ENODEV;
139	}
140
141	pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
142	if (!pwrc)
143		return -ENOMEM;
144
145	pwrc->fw = meson_sm_get(sm_np);
146	of_node_put(sm_np);
147	if (!pwrc->fw)
148		return -EPROBE_DEFER;
149
150	pwrc->xlate.domains = devm_kcalloc(&pdev->dev, match->count,
151					   sizeof(*pwrc->xlate.domains),
152					   GFP_KERNEL);
153	if (!pwrc->xlate.domains)
154		return -ENOMEM;
155
156	pwrc->domains = devm_kcalloc(&pdev->dev, match->count,
157				     sizeof(*pwrc->domains), GFP_KERNEL);
158	if (!pwrc->domains)
159		return -ENOMEM;
160
161	pwrc->xlate.num_domains = match->count;
162	platform_set_drvdata(pdev, pwrc);
163
164	for (i = 0 ; i < match->count ; ++i) {
165		struct meson_secure_pwrc_domain *dom = &pwrc->domains[i];
166
167		if (!match->domains[i].index)
168			continue;
169
170		dom->pwrc = pwrc;
171		dom->index = match->domains[i].index;
172		dom->base.name = match->domains[i].name;
173		dom->base.flags = match->domains[i].flags;
174		dom->base.power_on = meson_secure_pwrc_on;
175		dom->base.power_off = meson_secure_pwrc_off;
176
177		pm_genpd_init(&dom->base, NULL, match->domains[i].is_off(dom));
178
179		pwrc->xlate.domains[i] = &dom->base;
180	}
181
182	return of_genpd_add_provider_onecell(pdev->dev.of_node, &pwrc->xlate);
183}
184
185static struct meson_secure_pwrc_domain_data meson_secure_a1_pwrc_data = {
186	.domains = a1_pwrc_domains,
187	.count = ARRAY_SIZE(a1_pwrc_domains),
188};
189
190static const struct of_device_id meson_secure_pwrc_match_table[] = {
191	{
192		.compatible = "amlogic,meson-a1-pwrc",
193		.data = &meson_secure_a1_pwrc_data,
194	},
195	{ /* sentinel */ }
196};
197MODULE_DEVICE_TABLE(of, meson_secure_pwrc_match_table);
198
199static struct platform_driver meson_secure_pwrc_driver = {
200	.probe = meson_secure_pwrc_probe,
201	.driver = {
202		.name		= "meson_secure_pwrc",
203		.of_match_table	= meson_secure_pwrc_match_table,
204	},
205};
206module_platform_driver(meson_secure_pwrc_driver);
207MODULE_LICENSE("Dual MIT/GPL");