diff options
Diffstat (limited to 'drivers/soc/bcm/raspberrypi-power.c')
-rw-r--r-- | drivers/soc/bcm/raspberrypi-power.c | 245 |
1 files changed, 0 insertions, 245 deletions
diff --git a/drivers/soc/bcm/raspberrypi-power.c b/drivers/soc/bcm/raspberrypi-power.c deleted file mode 100644 index 58175af982a0..000000000000 --- a/drivers/soc/bcm/raspberrypi-power.c +++ /dev/null @@ -1,245 +0,0 @@ -// 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"); |