diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0268-ARM-bcm2835-add-rpi-power-domain-driver.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0268-ARM-bcm2835-add-rpi-power-domain-driver.patch | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0268-ARM-bcm2835-add-rpi-power-domain-driver.patch b/target/linux/brcm2708/patches-4.4/0268-ARM-bcm2835-add-rpi-power-domain-driver.patch new file mode 100644 index 0000000..8eec0c9 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0268-ARM-bcm2835-add-rpi-power-domain-driver.patch @@ -0,0 +1,361 @@ +From 9088d7b5c981548b23b8a5c96310bca88ef1503f Mon Sep 17 00:00:00 2001 +From: Alexander Aring <alex.aring@gmail.com> +Date: Wed, 16 Dec 2015 16:26:47 -0800 +Subject: [PATCH 268/381] ARM: bcm2835: add rpi power domain driver + +This patch adds support for several power domains on Raspberry Pi, +including USB (so it can be enabled even if the bootloader didn't do +it), and graphics. + +This patch is the combined work of Eric Anholt (who wrote USB support +inside of the Raspberry Pi firmware driver, and wrote the non-USB +domain support) and Alexander Aring (who separated the original USB +work out from the firmware driver). + +Signed-off-by: Alexander Aring <alex.aring@gmail.com> +Signed-off-by: Eric Anholt <eric@anholt.net> +Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> +Reviewed-by: Kevin Hilman <khilman@linaro.org> +(cherry picked from commit a09cd356586d33f64cbe64ee4f5c1a7c4a6abee5) +--- + drivers/soc/Kconfig | 1 + + drivers/soc/Makefile | 1 + + drivers/soc/bcm/Kconfig | 9 + + drivers/soc/bcm/Makefile | 1 + + drivers/soc/bcm/raspberrypi-power.c | 247 ++++++++++++++++++++++++++ + include/dt-bindings/power/raspberrypi-power.h | 41 +++++ + 6 files changed, 300 insertions(+) + create mode 100644 drivers/soc/bcm/Kconfig + create mode 100644 drivers/soc/bcm/Makefile + create mode 100644 drivers/soc/bcm/raspberrypi-power.c + create mode 100644 include/dt-bindings/power/raspberrypi-power.h + +--- a/drivers/soc/Kconfig ++++ b/drivers/soc/Kconfig +@@ -1,5 +1,6 @@ + menu "SOC (System On Chip) specific Drivers" + ++source "drivers/soc/bcm/Kconfig" + source "drivers/soc/brcmstb/Kconfig" + source "drivers/soc/mediatek/Kconfig" + source "drivers/soc/qcom/Kconfig" +--- a/drivers/soc/Makefile ++++ b/drivers/soc/Makefile +@@ -2,6 +2,7 @@ + # Makefile for the Linux Kernel SOC specific device drivers. + # + ++obj-y += bcm/ + obj-$(CONFIG_SOC_BRCMSTB) += brcmstb/ + obj-$(CONFIG_MACH_DOVE) += dove/ + obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/ +--- /dev/null ++++ b/drivers/soc/bcm/Kconfig +@@ -0,0 +1,9 @@ ++config RASPBERRYPI_POWER ++ bool "Raspberry Pi power domain driver" ++ depends on ARCH_BCM2835 || COMPILE_TEST ++ depends on RASPBERRYPI_FIRMWARE ++ select PM_GENERIC_DOMAINS if PM ++ select PM_GENERIC_DOMAINS_OF if PM ++ help ++ This enables support for the RPi power domains which can be enabled ++ or disabled via the RPi firmware. +--- /dev/null ++++ b/drivers/soc/bcm/Makefile +@@ -0,0 +1 @@ ++obj-$(CONFIG_RASPBERRYPI_POWER) += raspberrypi-power.o +--- /dev/null ++++ b/drivers/soc/bcm/raspberrypi-power.c +@@ -0,0 +1,247 @@ ++/* (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ * ++ * 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; ++} __packet; ++ ++/* ++ * 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_kzalloc(dev, sizeof(*rpi_domains->xlate.domains) * ++ RPI_POWER_DOMAIN_COUNT, 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 = rpi_firmware_get(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"); +--- /dev/null ++++ b/include/dt-bindings/power/raspberrypi-power.h +@@ -0,0 +1,41 @@ ++/* ++ * Copyright © 2015 Broadcom ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#ifndef _DT_BINDINGS_ARM_BCM2835_RPI_POWER_H ++#define _DT_BINDINGS_ARM_BCM2835_RPI_POWER_H ++ ++/* These power domain indices are the firmware interface's indices ++ * minus one. ++ */ ++#define RPI_POWER_DOMAIN_I2C0 0 ++#define RPI_POWER_DOMAIN_I2C1 1 ++#define RPI_POWER_DOMAIN_I2C2 2 ++#define RPI_POWER_DOMAIN_VIDEO_SCALER 3 ++#define RPI_POWER_DOMAIN_VPU1 4 ++#define RPI_POWER_DOMAIN_HDMI 5 ++#define RPI_POWER_DOMAIN_USB 6 ++#define RPI_POWER_DOMAIN_VEC 7 ++#define RPI_POWER_DOMAIN_JPEG 8 ++#define RPI_POWER_DOMAIN_H264 9 ++#define RPI_POWER_DOMAIN_V3D 10 ++#define RPI_POWER_DOMAIN_ISP 11 ++#define RPI_POWER_DOMAIN_UNICAM0 12 ++#define RPI_POWER_DOMAIN_UNICAM1 13 ++#define RPI_POWER_DOMAIN_CCP2RX 14 ++#define RPI_POWER_DOMAIN_CSI2 15 ++#define RPI_POWER_DOMAIN_CPI 16 ++#define RPI_POWER_DOMAIN_DSI0 17 ++#define RPI_POWER_DOMAIN_DSI1 18 ++#define RPI_POWER_DOMAIN_TRANSPOSER 19 ++#define RPI_POWER_DOMAIN_CCP2TX 20 ++#define RPI_POWER_DOMAIN_CDP 21 ++#define RPI_POWER_DOMAIN_ARM 22 ++ ++#define RPI_POWER_DOMAIN_COUNT 23 ++ ++#endif /* _DT_BINDINGS_ARM_BCM2835_RPI_POWER_H */ |