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// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
* Copyright (c) 2019 Amlogic, Inc.
* Author: Jianxin Pan <jianxin.pan@amlogic.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/io.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <dt-bindings/power/meson-a1-power.h>
#include <linux/arm-smccc.h>
#include <linux/firmware/meson/meson_sm.h>
#include <linux/module.h>
#define PWRC_ON 1
#define PWRC_OFF 0
struct meson_secure_pwrc_domain {
struct generic_pm_domain base;
unsigned int index;
struct meson_secure_pwrc *pwrc;
};
struct meson_secure_pwrc {
struct meson_secure_pwrc_domain *domains;
struct genpd_onecell_data xlate;
struct meson_sm_firmware *fw;
};
struct meson_secure_pwrc_domain_desc {
unsigned int index;
unsigned int flags;
char *name;
bool (*is_off)(struct meson_secure_pwrc_domain *pwrc_domain);
};
struct meson_secure_pwrc_domain_data {
unsigned int count;
struct meson_secure_pwrc_domain_desc *domains;
};
static bool pwrc_secure_is_off(struct meson_secure_pwrc_domain *pwrc_domain)
{
int is_off = 1;
if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_GET, &is_off,
pwrc_domain->index, 0, 0, 0, 0) < 0)
pr_err("failed to get power domain status\n");
return is_off;
}
static int meson_secure_pwrc_off(struct generic_pm_domain *domain)
{
int ret = 0;
struct meson_secure_pwrc_domain *pwrc_domain =
container_of(domain, struct meson_secure_pwrc_domain, base);
if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
pwrc_domain->index, PWRC_OFF, 0, 0, 0) < 0) {
pr_err("failed to set power domain off\n");
ret = -EINVAL;
}
return ret;
}
static int meson_secure_pwrc_on(struct generic_pm_domain *domain)
{
int ret = 0;
struct meson_secure_pwrc_domain *pwrc_domain =
container_of(domain, struct meson_secure_pwrc_domain, base);
if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
pwrc_domain->index, PWRC_ON, 0, 0, 0) < 0) {
pr_err("failed to set power domain on\n");
ret = -EINVAL;
}
return ret;
}
#define SEC_PD(__name, __flag) \
[PWRC_##__name##_ID] = \
{ \
.name = #__name, \
.index = PWRC_##__name##_ID, \
.is_off = pwrc_secure_is_off, \
.flags = __flag, \
}
static struct meson_secure_pwrc_domain_desc a1_pwrc_domains[] = {
SEC_PD(DSPA, 0),
SEC_PD(DSPB, 0),
/* UART should keep working in ATF after suspend and before resume */
SEC_PD(UART, GENPD_FLAG_ALWAYS_ON),
/* DMC is for DDR PHY ana/dig and DMC, and should be always on */
SEC_PD(DMC, GENPD_FLAG_ALWAYS_ON),
SEC_PD(I2C, 0),
SEC_PD(PSRAM, 0),
SEC_PD(ACODEC, 0),
SEC_PD(AUDIO, 0),
SEC_PD(OTP, 0),
SEC_PD(DMA, 0),
SEC_PD(SD_EMMC, 0),
SEC_PD(RAMA, 0),
/* SRAMB is used as ATF runtime memory, and should be always on */
SEC_PD(RAMB, GENPD_FLAG_ALWAYS_ON),
SEC_PD(IR, 0),
SEC_PD(SPICC, 0),
SEC_PD(SPIFC, 0),
SEC_PD(USB, 0),
/* NIC is for the Arm NIC-400 interconnect, and should be always on */
SEC_PD(NIC, GENPD_FLAG_ALWAYS_ON),
SEC_PD(PDMIN, 0),
SEC_PD(RSA, 0),
};
static int meson_secure_pwrc_probe(struct platform_device *pdev)
{
int i;
struct device_node *sm_np;
struct meson_secure_pwrc *pwrc;
const struct meson_secure_pwrc_domain_data *match;
match = of_device_get_match_data(&pdev->dev);
if (!match) {
dev_err(&pdev->dev, "failed to get match data\n");
return -ENODEV;
}
sm_np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gxbb-sm");
if (!sm_np) {
dev_err(&pdev->dev, "no secure-monitor node\n");
return -ENODEV;
}
pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
if (!pwrc)
return -ENOMEM;
pwrc->fw = meson_sm_get(sm_np);
of_node_put(sm_np);
if (!pwrc->fw)
return -EPROBE_DEFER;
pwrc->xlate.domains = devm_kcalloc(&pdev->dev, match->count,
sizeof(*pwrc->xlate.domains),
GFP_KERNEL);
if (!pwrc->xlate.domains)
return -ENOMEM;
pwrc->domains = devm_kcalloc(&pdev->dev, match->count,
sizeof(*pwrc->domains), GFP_KERNEL);
if (!pwrc->domains)
return -ENOMEM;
pwrc->xlate.num_domains = match->count;
platform_set_drvdata(pdev, pwrc);
for (i = 0 ; i < match->count ; ++i) {
struct meson_secure_pwrc_domain *dom = &pwrc->domains[i];
if (!match->domains[i].index)
continue;
dom->pwrc = pwrc;
dom->index = match->domains[i].index;
dom->base.name = match->domains[i].name;
dom->base.flags = match->domains[i].flags;
dom->base.power_on = meson_secure_pwrc_on;
dom->base.power_off = meson_secure_pwrc_off;
pm_genpd_init(&dom->base, NULL, match->domains[i].is_off(dom));
pwrc->xlate.domains[i] = &dom->base;
}
return of_genpd_add_provider_onecell(pdev->dev.of_node, &pwrc->xlate);
}
static struct meson_secure_pwrc_domain_data meson_secure_a1_pwrc_data = {
.domains = a1_pwrc_domains,
.count = ARRAY_SIZE(a1_pwrc_domains),
};
static const struct of_device_id meson_secure_pwrc_match_table[] = {
{
.compatible = "amlogic,meson-a1-pwrc",
.data = &meson_secure_a1_pwrc_data,
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, meson_secure_pwrc_match_table);
static struct platform_driver meson_secure_pwrc_driver = {
.probe = meson_secure_pwrc_probe,
.driver = {
.name = "meson_secure_pwrc",
.of_match_table = meson_secure_pwrc_match_table,
},
};
module_platform_driver(meson_secure_pwrc_driver);
MODULE_LICENSE("Dual MIT/GPL");
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