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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-21 GuEe-GUI first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include <firmware-raspberrypi.h>
#include <dt-bindings/power/raspberrypi-power.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
/*
* Packet definition used by RPI_FIRMWARE_SET_POWER_STATE and
* RPI_FIRMWARE_SET_DOMAIN_STATE.
*/
struct rpi_power_domain_packet
{
rt_uint32_t domain;
rt_uint32_t state;
};
struct rpi_power_domain
{
struct rt_dm_power_domain parent;
rt_uint32_t domain;
rt_bool_t old_interface;
struct rpi_firmware *rpi_fw;
};
#define raw_to_rpi_power_domain(raw) rt_container_of(raw, struct rpi_power_domain, parent)
struct rpi_power_domains
{
struct rt_dm_power_domain_proxy parent;
rt_bool_t has_new_interface;
struct rpi_firmware *rpi_fw;
struct rpi_power_domain domains[RPI_POWER_DOMAIN_COUNT];
};
#define raw_to_rpi_power_domains(raw) rt_container_of(raw, struct rpi_power_domains, parent)
static rt_err_t rpi_firmware_set_power(struct rt_dm_power_domain *domain, rt_bool_t on)
{
struct rpi_power_domain *rpi_domain = raw_to_rpi_power_domain(domain);
struct rpi_power_domain_packet packet;
packet.domain = rpi_domain->domain;
packet.state = on;
return rpi_firmware_property(rpi_domain->rpi_fw,
rpi_domain->old_interface ?
RPI_FIRMWARE_SET_POWER_STATE : RPI_FIRMWARE_SET_DOMAIN_STATE,
&packet, sizeof(packet));
}
static rt_err_t rpi_domain_off(struct rt_dm_power_domain *domain)
{
return rpi_firmware_set_power(domain, RT_FALSE);
}
static rt_err_t rpi_domain_on(struct rt_dm_power_domain *domain)
{
return rpi_firmware_set_power(domain, RT_TRUE);
}
static struct rt_dm_power_domain *rpi_power_domains_ofw_parse(
struct rt_dm_power_domain_proxy *proxy, struct rt_ofw_cell_args *args)
{
struct rpi_power_domains *rpi_domains = raw_to_rpi_power_domains(proxy);
return &rpi_domains->domains[args->args[0]].parent;
}
static void rpi_common_init_power_domain(struct rpi_power_domains *rpi_domains, int id)
{
struct rpi_power_domain *dom = &rpi_domains->domains[id];
dom->rpi_fw = rpi_domains->rpi_fw;
dom->parent.power_on = rpi_domain_on;
dom->parent.power_off = rpi_domain_off;
rt_dm_power_domain_register(&dom->parent);
}
static void rpi_init_power_domain(struct rpi_power_domains *rpi_domains,
int id, const char *name)
{
struct rpi_power_domain *dom = &rpi_domains->domains[id];
if (!rpi_domains->has_new_interface)
{
return;
}
/* The DT binding index is the firmware's domain index minus one. */
dom->domain = id + 1;
rpi_common_init_power_domain(rpi_domains, id);
(void)name;
}
static void rpi_init_old_power_domain(struct rpi_power_domains *rpi_domains,
int id, int domain, const char *name)
{
struct rpi_power_domain *dom = &rpi_domains->domains[id];
dom->old_interface = RT_TRUE;
dom->domain = domain;
rpi_common_init_power_domain(rpi_domains, id);
(void)name;
}
/*
* Detect whether the firmware supports the new power domains interface.
*
* The firmware does not return an error on an unknown tag and just skips
* over it, so probe by putting an unexpected value in the return field
* and checking if it was unchanged.
*/
static rt_bool_t rpi_has_new_domain_support(struct rpi_power_domains *rpi_domains)
{
struct rpi_power_domain_packet packet;
packet.domain = RPI_POWER_DOMAIN_ARM;
packet.state = ~0;
return !rpi_firmware_property(rpi_domains->rpi_fw,
RPI_FIRMWARE_GET_DOMAIN_STATE, &packet, sizeof(packet)) &&
packet.state != ~0;
}
static rt_err_t rpi_power_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
struct rt_device *dev = &pdev->parent;
struct rt_ofw_node *np = dev->ofw_node;
struct rt_ofw_node *fw_np;
struct rpi_power_domains *rpi_domains = rt_calloc(1, sizeof(*rpi_domains));
if (!rpi_domains)
{
return -RT_ENOMEM;
}
fw_np = rt_ofw_parse_phandle(np, "firmware", 0);
if (!fw_np)
{
err = -RT_EINVAL;
goto _fail;
}
rpi_domains->rpi_fw = rpi_firmware_get(fw_np);
rt_ofw_node_put(fw_np);
if (!rpi_domains->rpi_fw)
{
err = -RT_EINVAL;
goto _fail;
}
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");
rpi_domains->parent.ofw_parse = rpi_power_domains_ofw_parse;
rt_dm_power_domain_proxy_ofw_bind(&rpi_domains->parent, pdev->parent.ofw_node);
return RT_EOK;
_fail:
rt_free(rpi_domains);
return err;
}
static const struct rt_ofw_node_id rpi_power_ofw_ids[] =
{
{ .compatible = "raspberrypi,bcm2835-power" },
{ /* sentinel */ }
};
static struct rt_platform_driver rpi_power_driver =
{
.name = "raspberrypi-power",
.ids = rpi_power_ofw_ids,
.probe = rpi_power_probe,
};
static int rpi_power_drv_register(void)
{
rt_platform_driver_register(&rpi_power_driver);
return 0;
}
INIT_SUBSYS_EXPORT(rpi_power_drv_register);
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