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Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0077-ARM-bcm2835-Add-the-Raspberry-Pi-firmware-driver.patch')
-rw-r--r--target/linux/brcm2708/patches-4.1/0077-ARM-bcm2835-Add-the-Raspberry-Pi-firmware-driver.patch426
1 files changed, 426 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0077-ARM-bcm2835-Add-the-Raspberry-Pi-firmware-driver.patch b/target/linux/brcm2708/patches-4.1/0077-ARM-bcm2835-Add-the-Raspberry-Pi-firmware-driver.patch
new file mode 100644
index 0000000..f739cbc
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.1/0077-ARM-bcm2835-Add-the-Raspberry-Pi-firmware-driver.patch
@@ -0,0 +1,426 @@
+From 48297e4045a1d8a3b2a0edbe6cf371a34c5eb3be Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Thu, 4 Jun 2015 13:11:46 -0700
+Subject: [PATCH 077/121] ARM: bcm2835: Add the Raspberry Pi firmware driver
+
+This gives us a function for making mailbox property channel requests
+of the firmware, which is most notable in that it will let us get and
+set clock rates.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+---
+ drivers/firmware/Kconfig | 7 +
+ drivers/firmware/Makefile | 1 +
+ drivers/firmware/raspberrypi.c | 260 +++++++++++++++++++++++++++++
+ include/soc/bcm2835/raspberrypi-firmware.h | 115 +++++++++++++
+ 4 files changed, 383 insertions(+)
+ create mode 100644 drivers/firmware/raspberrypi.c
+ create mode 100644 include/soc/bcm2835/raspberrypi-firmware.h
+
+--- a/drivers/firmware/Kconfig
++++ b/drivers/firmware/Kconfig
+@@ -136,6 +136,13 @@ config QCOM_SCM
+ bool
+ depends on ARM || ARM64
+
++config RASPBERRYPI_FIRMWARE
++ tristate "Raspberry Pi Firmware Driver"
++ depends on BCM2835_MBOX
++ help
++ This option enables support for communicating with the firmware on the
++ Raspberry Pi.
++
+ source "drivers/firmware/google/Kconfig"
+ source "drivers/firmware/efi/Kconfig"
+
+--- a/drivers/firmware/Makefile
++++ b/drivers/firmware/Makefile
+@@ -13,6 +13,7 @@ obj-$(CONFIG_ISCSI_IBFT) += iscsi_ibft.o
+ obj-$(CONFIG_FIRMWARE_MEMMAP) += memmap.o
+ obj-$(CONFIG_QCOM_SCM) += qcom_scm.o
+ CFLAGS_qcom_scm.o :=$(call as-instr,.arch_extension sec,-DREQUIRES_SEC=1)
++obj-$(CONFIG_RASPBERRYPI_FIRMWARE) += raspberrypi.o
+
+ obj-$(CONFIG_GOOGLE_FIRMWARE) += google/
+ obj-$(CONFIG_EFI) += efi/
+--- /dev/null
++++ b/drivers/firmware/raspberrypi.c
+@@ -0,0 +1,260 @@
++/*
++ * Defines interfaces for interacting wtih the Raspberry Pi firmware's
++ * property channel.
++ *
++ * 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.
++ */
++
++#include <linux/dma-mapping.h>
++#include <linux/mailbox_client.h>
++#include <linux/module.h>
++#include <linux/of_platform.h>
++#include <linux/platform_device.h>
++#include <soc/bcm2835/raspberrypi-firmware.h>
++
++#define MBOX_MSG(chan, data28) (((data28) & ~0xf) | ((chan) & 0xf))
++#define MBOX_CHAN(msg) ((msg) & 0xf)
++#define MBOX_DATA28(msg) ((msg) & ~0xf)
++#define MBOX_CHAN_PROPERTY 8
++
++struct rpi_firmware {
++ struct mbox_client cl;
++ struct mbox_chan *chan; /* The property channel. */
++ struct completion c;
++ u32 enabled;
++};
++
++static DEFINE_MUTEX(transaction_lock);
++
++static void response_callback(struct mbox_client *cl, void *msg)
++{
++ struct rpi_firmware *fw = container_of(cl, struct rpi_firmware, cl);
++ complete(&fw->c);
++}
++
++/*
++ * Sends a request to the firmware through the BCM2835 mailbox driver,
++ * and synchronously waits for the reply.
++ */
++static int
++rpi_firmware_transaction(struct rpi_firmware *fw, u32 chan, u32 data)
++{
++ u32 message = MBOX_MSG(chan, data);
++ int ret;
++
++ WARN_ON(data & 0xf);
++
++ mutex_lock(&transaction_lock);
++ reinit_completion(&fw->c);
++ ret = mbox_send_message(fw->chan, &message);
++ if (ret >= 0) {
++ wait_for_completion(&fw->c);
++ ret = 0;
++ } else {
++ dev_err(fw->cl.dev, "mbox_send_message returned %d\n", ret);
++ }
++ mutex_unlock(&transaction_lock);
++
++ return ret;
++}
++
++/**
++ * rpi_firmware_property_list - Submit firmware property list
++ * @fw: Pointer to firmware structure from rpi_firmware_get().
++ * @data: Buffer holding tags.
++ * @tag_size: Size of tags buffer.
++ *
++ * Submits a set of concatenated tags to the VPU firmware through the
++ * mailbox property interface.
++ *
++ * The buffer header and the ending tag are added by this function and
++ * don't need to be supplied, just the actual tags for your operation.
++ * See struct rpi_firmware_property_tag_header for the per-tag
++ * structure.
++ */
++int rpi_firmware_property_list(struct rpi_firmware *fw,
++ void *data, size_t tag_size)
++{
++ size_t size = tag_size + 12;
++ u32 *buf;
++ dma_addr_t bus_addr;
++ int ret;
++
++ /* Packets are processed a dword at a time. */
++ if (size & 3)
++ return -EINVAL;
++
++ buf = dma_alloc_coherent(fw->cl.dev, PAGE_ALIGN(size), &bus_addr,
++ GFP_ATOMIC);
++ if (!buf)
++ return -ENOMEM;
++
++ /* The firmware will error out without parsing in this case. */
++ WARN_ON(size >= 1024 * 1024);
++
++ buf[0] = size;
++ buf[1] = RPI_FIRMWARE_STATUS_REQUEST;
++ memcpy(&buf[2], data, tag_size);
++ buf[size / 4 - 1] = RPI_FIRMWARE_PROPERTY_END;
++ wmb();
++
++ ret = rpi_firmware_transaction(fw, MBOX_CHAN_PROPERTY, bus_addr);
++
++ rmb();
++ memcpy(data, &buf[2], tag_size);
++ if (ret == 0 && buf[1] != RPI_FIRMWARE_STATUS_SUCCESS) {
++ /*
++ * The tag name here might not be the one causing the
++ * error, if there were multiple tags in the request.
++ * But single-tag is the most common, so go with it.
++ */
++ dev_err(fw->cl.dev, "Request 0x%08x returned status 0x%08x\n",
++ buf[2], buf[1]);
++ ret = -EINVAL;
++ }
++
++ dma_free_coherent(fw->cl.dev, PAGE_ALIGN(size), buf, bus_addr);
++
++ return ret;
++}
++EXPORT_SYMBOL_GPL(rpi_firmware_property_list);
++
++/**
++ * rpi_firmware_property - Submit single firmware property
++ * @fw: Pointer to firmware structure from rpi_firmware_get().
++ * @tag: One of enum_mbox_property_tag.
++ * @tag_data: Tag data buffer.
++ * @buf_size: Buffer size.
++ *
++ * Submits a single tag to the VPU firmware through the mailbox
++ * property interface.
++ *
++ * This is a convenience wrapper around
++ * rpi_firmware_property_list() to avoid some of the
++ * boilerplate in property calls.
++ */
++int rpi_firmware_property(struct rpi_firmware *fw,
++ u32 tag, void *tag_data, size_t buf_size)
++{
++ /* Single tags are very small (generally 8 bytes), so the
++ * stack should be safe.
++ */
++ u8 data[buf_size + sizeof(struct rpi_firmware_property_tag_header)];
++ struct rpi_firmware_property_tag_header *header =
++ (struct rpi_firmware_property_tag_header *)data;
++ int ret;
++
++ header->tag = tag;
++ header->buf_size = buf_size;
++ header->req_resp_size = 0;
++ memcpy(data + sizeof(struct rpi_firmware_property_tag_header),
++ tag_data, buf_size);
++
++ ret = rpi_firmware_property_list(fw, &data, sizeof(data));
++ memcpy(tag_data,
++ data + sizeof(struct rpi_firmware_property_tag_header),
++ buf_size);
++
++ return ret;
++}
++EXPORT_SYMBOL_GPL(rpi_firmware_property);
++
++static void
++rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
++{
++ u32 packet;
++ int ret = rpi_firmware_property(fw,
++ RPI_FIRMWARE_GET_FIRMWARE_REVISION,
++ &packet, sizeof(packet));
++
++ if (ret == 0) {
++ struct tm tm;
++
++ time_to_tm(packet, 0, &tm);
++
++ dev_info(fw->cl.dev,
++ "Attached to firmware from %04ld-%02d-%02d %02d:%02d\n",
++ tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
++ tm.tm_hour, tm.tm_min);
++ }
++}
++
++static int rpi_firmware_probe(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct rpi_firmware *fw;
++
++ fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL);
++ if (!fw)
++ return -ENOMEM;
++
++ fw->cl.dev = dev;
++ fw->cl.rx_callback = response_callback;
++ fw->cl.tx_block = true;
++
++ fw->chan = mbox_request_channel(&fw->cl, 0);
++ if (IS_ERR(fw->chan)) {
++ int ret = PTR_ERR(fw->chan);
++ if (ret != -EPROBE_DEFER)
++ dev_err(dev, "Failed to get mbox channel: %d\n", ret);
++ return ret;
++ }
++
++ init_completion(&fw->c);
++
++ platform_set_drvdata(pdev, fw);
++
++ rpi_firmware_print_firmware_revision(fw);
++
++ return 0;
++}
++
++static int rpi_firmware_remove(struct platform_device *pdev)
++{
++ struct rpi_firmware *fw = platform_get_drvdata(pdev);
++
++ mbox_free_channel(fw->chan);
++
++ return 0;
++}
++
++/**
++ * rpi_firmware_get - Get pointer to rpi_firmware structure.
++ * @firmware_node: Pointer to the firmware Device Tree node.
++ *
++ * Returns NULL is the firmware device is not ready.
++ */
++struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node)
++{
++ struct platform_device *pdev = of_find_device_by_node(firmware_node);
++
++ if (!pdev)
++ return NULL;
++
++ return platform_get_drvdata(pdev);
++}
++EXPORT_SYMBOL_GPL(rpi_firmware_get);
++
++static const struct of_device_id rpi_firmware_of_match[] = {
++ { .compatible = "raspberrypi,bcm2835-firmware", },
++ {},
++};
++MODULE_DEVICE_TABLE(of, rpi_firmware_of_match);
++
++static struct platform_driver rpi_firmware_driver = {
++ .driver = {
++ .name = "raspberrypi-firmware",
++ .of_match_table = rpi_firmware_of_match,
++ },
++ .probe = rpi_firmware_probe,
++ .remove = rpi_firmware_remove,
++};
++module_platform_driver(rpi_firmware_driver);
++
++MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
++MODULE_DESCRIPTION("Raspberry Pi firmware driver");
++MODULE_LICENSE("GPL v2");
+--- /dev/null
++++ b/include/soc/bcm2835/raspberrypi-firmware.h
+@@ -0,0 +1,115 @@
++/*
++ * 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.
++ */
++
++#include <linux/types.h>
++#include <linux/of_device.h>
++
++struct rpi_firmware;
++
++enum rpi_firmware_property_status {
++ RPI_FIRMWARE_STATUS_REQUEST = 0,
++ RPI_FIRMWARE_STATUS_SUCCESS = 0x80000000,
++ RPI_FIRMWARE_STATUS_ERROR = 0x80000001,
++};
++
++/**
++ * struct rpi_firmware_property_tag_header - Firmware property tag header
++ * @tag: One of enum_mbox_property_tag.
++ * @buf_size: The number of bytes in the value buffer following this
++ * struct.
++ * @req_resp_size: On submit, the length of the request (though it doesn't
++ * appear to be currently used by the firmware). On return,
++ * the length of the response (always 4 byte aligned), with
++ * the low bit set.
++ */
++struct rpi_firmware_property_tag_header {
++ u32 tag;
++ u32 buf_size;
++ u32 req_resp_size;
++};
++
++enum rpi_firmware_property_tag {
++ RPI_FIRMWARE_PROPERTY_END = 0,
++ RPI_FIRMWARE_GET_FIRMWARE_REVISION = 0x00000001,
++
++ RPI_FIRMWARE_SET_CURSOR_INFO = 0x00008010,
++ RPI_FIRMWARE_SET_CURSOR_STATE = 0x00008011,
++
++ RPI_FIRMWARE_GET_BOARD_MODEL = 0x00010001,
++ RPI_FIRMWARE_GET_BOARD_REVISION = 0x00010002,
++ RPI_FIRMWARE_GET_BOARD_MAC_ADDRESS = 0x00010003,
++ RPI_FIRMWARE_GET_BOARD_SERIAL = 0x00010004,
++ RPI_FIRMWARE_GET_ARM_MEMORY = 0x00010005,
++ RPI_FIRMWARE_GET_VC_MEMORY = 0x00010006,
++ RPI_FIRMWARE_GET_CLOCKS = 0x00010007,
++ RPI_FIRMWARE_GET_POWER_STATE = 0x00020001,
++ RPI_FIRMWARE_GET_TIMING = 0x00020002,
++ RPI_FIRMWARE_SET_POWER_STATE = 0x00028001,
++ RPI_FIRMWARE_GET_CLOCK_STATE = 0x00030001,
++ RPI_FIRMWARE_GET_CLOCK_RATE = 0x00030002,
++ RPI_FIRMWARE_GET_VOLTAGE = 0x00030003,
++ RPI_FIRMWARE_GET_MAX_CLOCK_RATE = 0x00030004,
++ RPI_FIRMWARE_GET_MAX_VOLTAGE = 0x00030005,
++ RPI_FIRMWARE_GET_TEMPERATURE = 0x00030006,
++ RPI_FIRMWARE_GET_MIN_CLOCK_RATE = 0x00030007,
++ RPI_FIRMWARE_GET_MIN_VOLTAGE = 0x00030008,
++ RPI_FIRMWARE_GET_TURBO = 0x00030009,
++ RPI_FIRMWARE_GET_MAX_TEMPERATURE = 0x0003000a,
++ RPI_FIRMWARE_ALLOCATE_MEMORY = 0x0003000c,
++ RPI_FIRMWARE_LOCK_MEMORY = 0x0003000d,
++ RPI_FIRMWARE_UNLOCK_MEMORY = 0x0003000e,
++ RPI_FIRMWARE_RELEASE_MEMORY = 0x0003000f,
++ RPI_FIRMWARE_EXECUTE_CODE = 0x00030010,
++ RPI_FIRMWARE_EXECUTE_QPU = 0x00030011,
++ RPI_FIRMWARE_SET_ENABLE_QPU = 0x00030012,
++ RPI_FIRMWARE_GET_DISPMANX_RESOURCE_MEM_HANDLE = 0x00030014,
++ RPI_FIRMWARE_GET_EDID_BLOCK = 0x00030020,
++ RPI_FIRMWARE_SET_CLOCK_STATE = 0x00038001,
++ RPI_FIRMWARE_SET_CLOCK_RATE = 0x00038002,
++ RPI_FIRMWARE_SET_VOLTAGE = 0x00038003,
++ RPI_FIRMWARE_SET_TURBO = 0x00038009,
++
++ /* Dispmanx TAGS */
++ RPI_FIRMWARE_FRAMEBUFFER_ALLOCATE = 0x00040001,
++ RPI_FIRMWARE_FRAMEBUFFER_BLANK = 0x00040002,
++ RPI_FIRMWARE_FRAMEBUFFER_GET_PHYSICAL_WIDTH_HEIGHT = 0x00040003,
++ RPI_FIRMWARE_FRAMEBUFFER_GET_VIRTUAL_WIDTH_HEIGHT = 0x00040004,
++ RPI_FIRMWARE_FRAMEBUFFER_GET_DEPTH = 0x00040005,
++ RPI_FIRMWARE_FRAMEBUFFER_GET_PIXEL_ORDER = 0x00040006,
++ RPI_FIRMWARE_FRAMEBUFFER_GET_ALPHA_MODE = 0x00040007,
++ RPI_FIRMWARE_FRAMEBUFFER_GET_PITCH = 0x00040008,
++ RPI_FIRMWARE_FRAMEBUFFER_GET_VIRTUAL_OFFSET = 0x00040009,
++ RPI_FIRMWARE_FRAMEBUFFER_GET_OVERSCAN = 0x0004000a,
++ RPI_FIRMWARE_FRAMEBUFFER_GET_PALETTE = 0x0004000b,
++ RPI_FIRMWARE_FRAMEBUFFER_RELEASE = 0x00048001,
++ RPI_FIRMWARE_FRAMEBUFFER_TEST_PHYSICAL_WIDTH_HEIGHT = 0x00044003,
++ RPI_FIRMWARE_FRAMEBUFFER_TEST_VIRTUAL_WIDTH_HEIGHT = 0x00044004,
++ RPI_FIRMWARE_FRAMEBUFFER_TEST_DEPTH = 0x00044005,
++ RPI_FIRMWARE_FRAMEBUFFER_TEST_PIXEL_ORDER = 0x00044006,
++ RPI_FIRMWARE_FRAMEBUFFER_TEST_ALPHA_MODE = 0x00044007,
++ RPI_FIRMWARE_FRAMEBUFFER_TEST_VIRTUAL_OFFSET = 0x00044009,
++ RPI_FIRMWARE_FRAMEBUFFER_TEST_OVERSCAN = 0x0004400a,
++ RPI_FIRMWARE_FRAMEBUFFER_TEST_PALETTE = 0x0004400b,
++ RPI_FIRMWARE_FRAMEBUFFER_SET_PHYSICAL_WIDTH_HEIGHT = 0x00048003,
++ RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_WIDTH_HEIGHT = 0x00048004,
++ RPI_FIRMWARE_FRAMEBUFFER_SET_DEPTH = 0x00048005,
++ RPI_FIRMWARE_FRAMEBUFFER_SET_PIXEL_ORDER = 0x00048006,
++ RPI_FIRMWARE_FRAMEBUFFER_SET_ALPHA_MODE = 0x00048007,
++ RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_OFFSET = 0x00048009,
++ RPI_FIRMWARE_FRAMEBUFFER_SET_OVERSCAN = 0x0004800a,
++ RPI_FIRMWARE_FRAMEBUFFER_SET_PALETTE = 0x0004800b,
++
++ RPI_FIRMWARE_GET_COMMAND_LINE = 0x00050001,
++ RPI_FIRMWARE_GET_DMA_CHANNELS = 0x00060001,
++};
++
++int rpi_firmware_property(struct rpi_firmware *fw,
++ u32 tag, void *data, size_t len);
++int rpi_firmware_property_list(struct rpi_firmware *fw,
++ void *data, size_t tag_size);
++struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node);