mirror of
https://github.com/torvalds/linux.git
synced 2025-10-31 16:48:26 +02:00
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> Acked-by: Stephen Warren <swarren@wwwdotorg.org>
This commit is contained in:
Eric Anholt
parent
6ff33f3902
commit
4e3d60656a
4 changed files with 383 additions and 0 deletions
|
|
@ -139,6 +139,13 @@ 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/broadcom/Kconfig"
|
||||
source "drivers/firmware/google/Kconfig"
|
||||
source "drivers/firmware/efi/Kconfig"
|
||||
|
|
|
|||
|
|
@ -15,6 +15,7 @@ obj-$(CONFIG_FIRMWARE_MEMMAP) += memmap.o
|
|||
obj-$(CONFIG_QCOM_SCM) += qcom_scm.o
|
||||
obj-$(CONFIG_QCOM_SCM) += qcom_scm-32.o
|
||||
CFLAGS_qcom_scm-32.o :=$(call as-instr,.arch_extension sec,-DREQUIRES_SEC=1)
|
||||
obj-$(CONFIG_RASPBERRYPI_FIRMWARE) += raspberrypi.o
|
||||
|
||||
obj-y += broadcom/
|
||||
obj-$(CONFIG_GOOGLE_FIRMWARE) += google/
|
||||
|
|
|
|||
260
drivers/firmware/raspberrypi.c
Normal file
260
drivers/firmware/raspberrypi.c
Normal file
|
|
@ -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");
|
||||
115
include/soc/bcm2835/raspberrypi-firmware.h
Normal file
115
include/soc/bcm2835/raspberrypi-firmware.h
Normal file
|
|
@ -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);
|
||||
Loading…
Reference in a new issue