diff options
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.patch | 426 |
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 0000000000..f739cbc78f --- /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); |