mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Nicolas Saenz Julienne](/assets/img/avatar_default.png)
Use devm_rpi_firmware_get() so as to make sure we release RPi's firmware interface when unbinding the device. Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
246 lines
7.2 KiB
C
246 lines
7.2 KiB
C
// 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 = devm_rpi_firmware_get(&pdev->dev, 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");
|