+++ /dev/null
-From 9384f8ab274dc6b34a6ce18e574cfa38e751f1d4 Mon Sep 17 00:00:00 2001
-From: Eric Anholt <eric@anholt.net>
-Date: Thu, 4 Jun 2015 13:11:46 -0700
-Subject: [PATCH 077/222] 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);
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