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70c2cf283c
Recent work on raspberry-power driver showed that even the stacktrace on firmware property timeout doesn't provide enough information. So add the first tag name to the warning to be in line with a status error. Signed-off-by: Stefan Wahren <wahrenst@gmx.net> Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com> Link: https://lore.kernel.org/r/20240728114200.75559-2-wahrenst@gmx.net Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
416 lines
10 KiB
C
416 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Defines interfaces for interacting with the Raspberry Pi firmware's
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* property channel.
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*
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* Copyright © 2015 Broadcom
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*/
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#include <linux/dma-mapping.h>
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#include <linux/kref.h>
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#include <linux/mailbox_client.h>
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#include <linux/mailbox_controller.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <soc/bcm2835/raspberrypi-firmware.h>
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#define MBOX_MSG(chan, data28) (((data28) & ~0xf) | ((chan) & 0xf))
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#define MBOX_CHAN(msg) ((msg) & 0xf)
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#define MBOX_DATA28(msg) ((msg) & ~0xf)
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#define MBOX_CHAN_PROPERTY 8
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static struct platform_device *rpi_hwmon;
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static struct platform_device *rpi_clk;
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struct rpi_firmware {
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struct mbox_client cl;
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struct mbox_chan *chan; /* The property channel. */
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struct completion c;
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u32 enabled;
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struct kref consumers;
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};
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static DEFINE_MUTEX(transaction_lock);
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static void response_callback(struct mbox_client *cl, void *msg)
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{
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struct rpi_firmware *fw = container_of(cl, struct rpi_firmware, cl);
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complete(&fw->c);
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}
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/*
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* Sends a request to the firmware through the BCM2835 mailbox driver,
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* and synchronously waits for the reply.
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*/
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static int
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rpi_firmware_transaction(struct rpi_firmware *fw, u32 chan, u32 data)
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{
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u32 message = MBOX_MSG(chan, data);
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int ret;
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WARN_ON(data & 0xf);
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mutex_lock(&transaction_lock);
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reinit_completion(&fw->c);
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ret = mbox_send_message(fw->chan, &message);
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if (ret >= 0) {
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if (wait_for_completion_timeout(&fw->c, HZ)) {
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ret = 0;
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} else {
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ret = -ETIMEDOUT;
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}
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} else {
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dev_err(fw->cl.dev, "mbox_send_message returned %d\n", ret);
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}
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mutex_unlock(&transaction_lock);
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return ret;
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}
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/**
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* rpi_firmware_property_list - Submit firmware property list
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* @fw: Pointer to firmware structure from rpi_firmware_get().
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* @data: Buffer holding tags.
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* @tag_size: Size of tags buffer.
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*
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* Submits a set of concatenated tags to the VPU firmware through the
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* mailbox property interface.
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*
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* The buffer header and the ending tag are added by this function and
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* don't need to be supplied, just the actual tags for your operation.
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* See struct rpi_firmware_property_tag_header for the per-tag
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* structure.
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*/
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int rpi_firmware_property_list(struct rpi_firmware *fw,
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void *data, size_t tag_size)
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{
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size_t size = tag_size + 12;
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u32 *buf;
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dma_addr_t bus_addr;
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int ret;
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/* Packets are processed a dword at a time. */
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if (size & 3)
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return -EINVAL;
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buf = dma_alloc_coherent(fw->chan->mbox->dev, PAGE_ALIGN(size),
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&bus_addr, GFP_ATOMIC);
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if (!buf)
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return -ENOMEM;
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/* The firmware will error out without parsing in this case. */
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WARN_ON(size >= 1024 * 1024);
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buf[0] = size;
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buf[1] = RPI_FIRMWARE_STATUS_REQUEST;
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memcpy(&buf[2], data, tag_size);
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buf[size / 4 - 1] = RPI_FIRMWARE_PROPERTY_END;
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wmb();
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ret = rpi_firmware_transaction(fw, MBOX_CHAN_PROPERTY, bus_addr);
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rmb();
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memcpy(data, &buf[2], tag_size);
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if (ret == 0 && buf[1] != RPI_FIRMWARE_STATUS_SUCCESS) {
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/*
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* The tag name here might not be the one causing the
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* error, if there were multiple tags in the request.
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* But single-tag is the most common, so go with it.
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*/
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dev_err(fw->cl.dev, "Request 0x%08x returned status 0x%08x\n",
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buf[2], buf[1]);
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ret = -EINVAL;
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} else if (ret == -ETIMEDOUT) {
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WARN_ONCE(1, "Firmware transaction 0x%08x timeout", buf[2]);
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}
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dma_free_coherent(fw->chan->mbox->dev, PAGE_ALIGN(size), buf, bus_addr);
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return ret;
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}
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EXPORT_SYMBOL_GPL(rpi_firmware_property_list);
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/**
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* rpi_firmware_property - Submit single firmware property
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* @fw: Pointer to firmware structure from rpi_firmware_get().
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* @tag: One of enum_mbox_property_tag.
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* @tag_data: Tag data buffer.
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* @buf_size: Buffer size.
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*
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* Submits a single tag to the VPU firmware through the mailbox
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* property interface.
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*
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* This is a convenience wrapper around
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* rpi_firmware_property_list() to avoid some of the
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* boilerplate in property calls.
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*/
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int rpi_firmware_property(struct rpi_firmware *fw,
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u32 tag, void *tag_data, size_t buf_size)
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{
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struct rpi_firmware_property_tag_header *header;
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int ret;
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/* Some mailboxes can use over 1k bytes. Rather than checking
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* size and using stack or kmalloc depending on requirements,
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* just use kmalloc. Mailboxes don't get called enough to worry
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* too much about the time taken in the allocation.
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*/
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void *data = kmalloc(sizeof(*header) + buf_size, GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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header = data;
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header->tag = tag;
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header->buf_size = buf_size;
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header->req_resp_size = 0;
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memcpy(data + sizeof(*header), tag_data, buf_size);
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ret = rpi_firmware_property_list(fw, data, buf_size + sizeof(*header));
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memcpy(tag_data, data + sizeof(*header), buf_size);
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kfree(data);
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return ret;
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}
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EXPORT_SYMBOL_GPL(rpi_firmware_property);
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static void
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rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
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{
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time64_t date_and_time;
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u32 packet;
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int ret = rpi_firmware_property(fw,
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RPI_FIRMWARE_GET_FIRMWARE_REVISION,
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&packet, sizeof(packet));
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if (ret)
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return;
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/* This is not compatible with y2038 */
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date_and_time = packet;
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dev_info(fw->cl.dev, "Attached to firmware from %ptT\n", &date_and_time);
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}
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static void
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rpi_register_hwmon_driver(struct device *dev, struct rpi_firmware *fw)
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{
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u32 packet;
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int ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_THROTTLED,
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&packet, sizeof(packet));
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if (ret)
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return;
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rpi_hwmon = platform_device_register_data(dev, "raspberrypi-hwmon",
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-1, NULL, 0);
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}
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static void rpi_register_clk_driver(struct device *dev)
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{
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struct device_node *firmware;
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/*
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* Earlier DTs don't have a node for the firmware clocks but
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* rely on us creating a platform device by hand. If we do
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* have a node for the firmware clocks, just bail out here.
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*/
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firmware = of_get_compatible_child(dev->of_node,
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"raspberrypi,firmware-clocks");
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if (firmware) {
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of_node_put(firmware);
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return;
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}
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rpi_clk = platform_device_register_data(dev, "raspberrypi-clk",
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-1, NULL, 0);
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}
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unsigned int rpi_firmware_clk_get_max_rate(struct rpi_firmware *fw, unsigned int id)
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{
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struct rpi_firmware_clk_rate_request msg =
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RPI_FIRMWARE_CLK_RATE_REQUEST(id);
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int ret;
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ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_MAX_CLOCK_RATE,
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&msg, sizeof(msg));
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if (ret)
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/*
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* If our firmware doesn't support that operation, or fails, we
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* assume the maximum clock rate is absolute maximum we can
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* store over our type.
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*/
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return UINT_MAX;
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return le32_to_cpu(msg.rate);
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}
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EXPORT_SYMBOL_GPL(rpi_firmware_clk_get_max_rate);
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static void rpi_firmware_delete(struct kref *kref)
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{
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struct rpi_firmware *fw = container_of(kref, struct rpi_firmware,
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consumers);
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mbox_free_channel(fw->chan);
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kfree(fw);
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}
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void rpi_firmware_put(struct rpi_firmware *fw)
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{
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kref_put(&fw->consumers, rpi_firmware_delete);
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}
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EXPORT_SYMBOL_GPL(rpi_firmware_put);
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static void devm_rpi_firmware_put(void *data)
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{
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struct rpi_firmware *fw = data;
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rpi_firmware_put(fw);
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}
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static int rpi_firmware_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct rpi_firmware *fw;
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/*
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* Memory will be freed by rpi_firmware_delete() once all users have
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* released their firmware handles. Don't use devm_kzalloc() here.
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*/
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fw = kzalloc(sizeof(*fw), GFP_KERNEL);
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if (!fw)
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return -ENOMEM;
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fw->cl.dev = dev;
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fw->cl.rx_callback = response_callback;
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fw->cl.tx_block = true;
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fw->chan = mbox_request_channel(&fw->cl, 0);
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if (IS_ERR(fw->chan)) {
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int ret = PTR_ERR(fw->chan);
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kfree(fw);
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return dev_err_probe(dev, ret, "Failed to get mbox channel\n");
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}
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init_completion(&fw->c);
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kref_init(&fw->consumers);
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platform_set_drvdata(pdev, fw);
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rpi_firmware_print_firmware_revision(fw);
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rpi_register_hwmon_driver(dev, fw);
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rpi_register_clk_driver(dev);
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return 0;
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}
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static void rpi_firmware_shutdown(struct platform_device *pdev)
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{
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struct rpi_firmware *fw = platform_get_drvdata(pdev);
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if (!fw)
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return;
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rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_REBOOT, NULL, 0);
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}
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static void rpi_firmware_remove(struct platform_device *pdev)
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{
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struct rpi_firmware *fw = platform_get_drvdata(pdev);
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platform_device_unregister(rpi_hwmon);
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rpi_hwmon = NULL;
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platform_device_unregister(rpi_clk);
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rpi_clk = NULL;
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rpi_firmware_put(fw);
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}
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static const struct of_device_id rpi_firmware_of_match[] = {
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{ .compatible = "raspberrypi,bcm2835-firmware", },
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{},
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};
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MODULE_DEVICE_TABLE(of, rpi_firmware_of_match);
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struct device_node *rpi_firmware_find_node(void)
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{
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return of_find_matching_node(NULL, rpi_firmware_of_match);
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}
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EXPORT_SYMBOL_GPL(rpi_firmware_find_node);
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/**
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* rpi_firmware_get - Get pointer to rpi_firmware structure.
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* @firmware_node: Pointer to the firmware Device Tree node.
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*
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* The reference to rpi_firmware has to be released with rpi_firmware_put().
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*
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* Returns NULL is the firmware device is not ready.
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*/
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struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node)
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{
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struct platform_device *pdev = of_find_device_by_node(firmware_node);
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struct rpi_firmware *fw;
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if (!pdev)
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return NULL;
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fw = platform_get_drvdata(pdev);
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if (!fw)
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goto err_put_device;
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if (!kref_get_unless_zero(&fw->consumers))
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goto err_put_device;
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put_device(&pdev->dev);
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return fw;
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err_put_device:
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put_device(&pdev->dev);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(rpi_firmware_get);
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/**
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* devm_rpi_firmware_get - Get pointer to rpi_firmware structure.
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* @dev: The firmware device structure
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* @firmware_node: Pointer to the firmware Device Tree node.
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*
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* Returns NULL is the firmware device is not ready.
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*/
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struct rpi_firmware *devm_rpi_firmware_get(struct device *dev,
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struct device_node *firmware_node)
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{
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struct rpi_firmware *fw;
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fw = rpi_firmware_get(firmware_node);
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if (!fw)
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return NULL;
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if (devm_add_action_or_reset(dev, devm_rpi_firmware_put, fw))
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return NULL;
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return fw;
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}
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EXPORT_SYMBOL_GPL(devm_rpi_firmware_get);
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static struct platform_driver rpi_firmware_driver = {
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.driver = {
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.name = "raspberrypi-firmware",
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.of_match_table = rpi_firmware_of_match,
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},
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.probe = rpi_firmware_probe,
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.shutdown = rpi_firmware_shutdown,
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.remove_new = rpi_firmware_remove,
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};
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module_platform_driver(rpi_firmware_driver);
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MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
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MODULE_DESCRIPTION("Raspberry Pi firmware driver");
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MODULE_LICENSE("GPL v2");
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