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-rw-r--r--configs/platform-rpi/patches/linux-4.4/0012-ARM-bcm2835-add-rpi-power-domain-driver.patch374
1 files changed, 374 insertions, 0 deletions
diff --git a/configs/platform-rpi/patches/linux-4.4/0012-ARM-bcm2835-add-rpi-power-domain-driver.patch b/configs/platform-rpi/patches/linux-4.4/0012-ARM-bcm2835-add-rpi-power-domain-driver.patch
new file mode 100644
index 0000000..e4aad60
--- /dev/null
+++ b/configs/platform-rpi/patches/linux-4.4/0012-ARM-bcm2835-add-rpi-power-domain-driver.patch
@@ -0,0 +1,374 @@
+From: Alexander Aring <alex.aring@gmail.com>
+Date: Wed, 16 Dec 2015 16:26:47 -0800
+Subject: [PATCH] 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>
+Signed-off-by: Alexander Aring <alex.aring@gmail.com>
+---
+ 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/soc/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/soc/raspberrypi-power.h
+
+diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
+index 4e853ed2c82b..844142620031 100644
+--- 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"
+diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
+index f2ba2e932ae1..f3f955cdb04b 100644
+--- 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-$(CONFIG_ARCH_MEDIATEK) += mediatek/
+diff --git a/drivers/soc/bcm/Kconfig b/drivers/soc/bcm/Kconfig
+new file mode 100644
+index 000000000000..5ba1827fe36f
+--- /dev/null
++++ b/drivers/soc/bcm/Kconfig
+@@ -0,0 +1,9 @@
++config RASPBERRYPI_POWER
++ bool "Raspberry Pi power domain driver"
++ depends on ARCH_BCM2835 || COMPILE_TEST
++ depends on RASPBERRYPI_FIRMWARE
++ select PM_GENERIC_DOMAINS if PM
++ select PM_GENERIC_DOMAINS_OF if PM
++ help
++ This enables support for the RPi power domains which can be enabled
++ or disabled via the RPi firmware.
+diff --git a/drivers/soc/bcm/Makefile b/drivers/soc/bcm/Makefile
+new file mode 100644
+index 000000000000..63aa3eb23087
+--- /dev/null
++++ b/drivers/soc/bcm/Makefile
+@@ -0,0 +1 @@
++obj-$(CONFIG_RASPBERRYPI_POWER) += raspberrypi-power.o
+diff --git a/drivers/soc/bcm/raspberrypi-power.c b/drivers/soc/bcm/raspberrypi-power.c
+new file mode 100644
+index 000000000000..d5bab0696580
+--- /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/soc/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");
+diff --git a/include/dt-bindings/soc/raspberrypi-power.h b/include/dt-bindings/soc/raspberrypi-power.h
+new file mode 100644
+index 000000000000..b3ff8e09a78f
+--- /dev/null
++++ b/include/dt-bindings/soc/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 */