// SPDX-License-Identifier: GPL-2.0 /* (C) 2015 Pengutronix, Alexander Aring * * Authors: * Alexander Aring * Eric Anholt */ #include #include #include #include #include #include /* * 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 "); MODULE_AUTHOR("Eric Anholt "); MODULE_DESCRIPTION("Raspberry Pi power domain driver"); MODULE_LICENSE("GPL v2");