Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/* (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
 *
 * Authors:
 * Alexander Aring <aar@pengutronix.de>
 * Eric Anholt <eric@anholt.net>
 */
 
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <dt-bindings/power/raspberrypi-power.h>
#include <soc/bcm2835/raspberrypi-firmware.h>
 
/*
 * Firmware indices for the old power domains interface.  Only a few
 * of them were actually implemented.
 */
#define RPI_OLD_POWER_DOMAIN_USB		3
#define RPI_OLD_POWER_DOMAIN_V3D		10
 
struct rpi_power_domain {
<------>u32 domain;
<------>bool enabled;
<------>bool old_interface;
<------>struct generic_pm_domain base;
<------>struct rpi_firmware *fw;
};
 
struct rpi_power_domains {
<------>bool has_new_interface;
<------>struct genpd_onecell_data xlate;
<------>struct rpi_firmware *fw;
<------>struct rpi_power_domain domains[RPI_POWER_DOMAIN_COUNT];
};
 
/*
 * Packet definition used by RPI_FIRMWARE_SET_POWER_STATE and
 * RPI_FIRMWARE_SET_DOMAIN_STATE
 */
struct rpi_power_domain_packet {
<------>u32 domain;
<------>u32 on;
};
 
/*
 * Asks the firmware to enable or disable power on a specific power
 * domain.
 */
static int rpi_firmware_set_power(struct rpi_power_domain *rpi_domain, bool on)
{
<------>struct rpi_power_domain_packet packet;
 
<------>packet.domain = rpi_domain->domain;
<------>packet.on = on;
<------>return rpi_firmware_property(rpi_domain->fw,
<------><------><------><------>     rpi_domain->old_interface ?
<------><------><------><------>     RPI_FIRMWARE_SET_POWER_STATE :
<------><------><------><------>     RPI_FIRMWARE_SET_DOMAIN_STATE,
<------><------><------><------>     &packet, sizeof(packet));
}
 
static int rpi_domain_off(struct generic_pm_domain *domain)
{
<------>struct rpi_power_domain *rpi_domain =
<------><------>container_of(domain, struct rpi_power_domain, base);
 
<------>return rpi_firmware_set_power(rpi_domain, false);
}
 
static int rpi_domain_on(struct generic_pm_domain *domain)
{
<------>struct rpi_power_domain *rpi_domain =
<------><------>container_of(domain, struct rpi_power_domain, base);
 
<------>return rpi_firmware_set_power(rpi_domain, true);
}
 
static void rpi_common_init_power_domain(struct rpi_power_domains *rpi_domains,
<------><------><------><------><------> int xlate_index, const char *name)
{
<------>struct rpi_power_domain *dom = &rpi_domains->domains[xlate_index];
 
<------>dom->fw = rpi_domains->fw;
 
<------>dom->base.name = name;
<------>dom->base.power_on = rpi_domain_on;
<------>dom->base.power_off = rpi_domain_off;
 
<------>/*
<------> * Treat all power domains as off at boot.
<------> *
<------> * The firmware itself may be keeping some domains on, but
<------> * from Linux's perspective all we control is the refcounts
<------> * that we give to the firmware, and we can't ask the firmware
<------> * to turn off something that we haven't ourselves turned on.
<------> */
<------>pm_genpd_init(&dom->base, NULL, true);
 
<------>rpi_domains->xlate.domains[xlate_index] = &dom->base;
}
 
static void rpi_init_power_domain(struct rpi_power_domains *rpi_domains,
<------><------><------><------>  int xlate_index, const char *name)
{
<------>struct rpi_power_domain *dom = &rpi_domains->domains[xlate_index];
 
<------>if (!rpi_domains->has_new_interface)
<------><------>return;
 
<------>/* The DT binding index is the firmware's domain index minus one. */
<------>dom->domain = xlate_index + 1;
 
<------>rpi_common_init_power_domain(rpi_domains, xlate_index, name);
}
 
static void rpi_init_old_power_domain(struct rpi_power_domains *rpi_domains,
<------><------><------><------>      int xlate_index, int domain,
<------><------><------><------>      const char *name)
{
<------>struct rpi_power_domain *dom = &rpi_domains->domains[xlate_index];
 
<------>dom->old_interface = true;
<------>dom->domain = domain;
 
<------>rpi_common_init_power_domain(rpi_domains, xlate_index, name);
}
 
/*
 * Detects whether the firmware supports the new power domains interface.
 *
 * The firmware doesn't actually return an error on an unknown tag,
 * and just skips over it, so we do the detection by putting an
 * unexpected value in the return field and checking if it was
 * unchanged.
 */
static bool
rpi_has_new_domain_support(struct rpi_power_domains *rpi_domains)
{
<------>struct rpi_power_domain_packet packet;
<------>int ret;
 
<------>packet.domain = RPI_POWER_DOMAIN_ARM;
<------>packet.on = ~0;
 
<------>ret = rpi_firmware_property(rpi_domains->fw,
<------><------><------><------>    RPI_FIRMWARE_GET_DOMAIN_STATE,
<------><------><------><------>    &packet, sizeof(packet));
 
<------>return ret == 0 && packet.on != ~0;
}
 
static int rpi_power_probe(struct platform_device *pdev)
{
<------>struct device_node *fw_np;
<------>struct device *dev = &pdev->dev;
<------>struct rpi_power_domains *rpi_domains;
 
<------>rpi_domains = devm_kzalloc(dev, sizeof(*rpi_domains), GFP_KERNEL);
<------>if (!rpi_domains)
<------><------>return -ENOMEM;
 
<------>rpi_domains->xlate.domains =
<------><------>devm_kcalloc(dev,
<------><------><------>     RPI_POWER_DOMAIN_COUNT,
<------><------><------>     sizeof(*rpi_domains->xlate.domains),
<------><------><------>     GFP_KERNEL);
<------>if (!rpi_domains->xlate.domains)
<------><------>return -ENOMEM;
 
<------>rpi_domains->xlate.num_domains = RPI_POWER_DOMAIN_COUNT;
 
<------>fw_np = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
<------>if (!fw_np) {
<------><------>dev_err(&pdev->dev, "no firmware node\n");
<------><------>return -ENODEV;
<------>}
 
<------>rpi_domains->fw = rpi_firmware_get(fw_np);
<------>of_node_put(fw_np);
<------>if (!rpi_domains->fw)
<------><------>return -EPROBE_DEFER;
 
<------>rpi_domains->has_new_interface =
<------><------>rpi_has_new_domain_support(rpi_domains);
 
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_I2C0, "I2C0");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_I2C1, "I2C1");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_I2C2, "I2C2");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_VIDEO_SCALER,
<------><------><------>      "VIDEO_SCALER");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_VPU1, "VPU1");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_HDMI, "HDMI");
 
<------>/*
<------> * Use the old firmware interface for USB power, so that we
<------> * can turn it on even if the firmware hasn't been updated.
<------> */
<------>rpi_init_old_power_domain(rpi_domains, RPI_POWER_DOMAIN_USB,
<------><------><------><------>  RPI_OLD_POWER_DOMAIN_USB, "USB");
 
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_VEC, "VEC");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_JPEG, "JPEG");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_H264, "H264");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_V3D, "V3D");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_ISP, "ISP");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_UNICAM0, "UNICAM0");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_UNICAM1, "UNICAM1");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_CCP2RX, "CCP2RX");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_CSI2, "CSI2");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_CPI, "CPI");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_DSI0, "DSI0");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_DSI1, "DSI1");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_TRANSPOSER,
<------><------><------>      "TRANSPOSER");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_CCP2TX, "CCP2TX");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_CDP, "CDP");
<------>rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_ARM, "ARM");
 
<------>of_genpd_add_provider_onecell(dev->of_node, &rpi_domains->xlate);
 
<------>platform_set_drvdata(pdev, rpi_domains);
 
<------>return 0;
}
 
static const struct of_device_id rpi_power_of_match[] = {
<------>{ .compatible = "raspberrypi,bcm2835-power", },
<------>{},
};
MODULE_DEVICE_TABLE(of, rpi_power_of_match);
 
static struct platform_driver rpi_power_driver = {
<------>.driver = {
<------><------>.name = "raspberrypi-power",
<------><------>.of_match_table = rpi_power_of_match,
<------>},
<------>.probe		= rpi_power_probe,
};
builtin_platform_driver(rpi_power_driver);
 
MODULE_AUTHOR("Alexander Aring <aar@pengutronix.de>");
MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
MODULE_DESCRIPTION("Raspberry Pi power domain driver");
MODULE_LICENSE("GPL v2");