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