mirror of
https://github.com/Fishwaldo/linux-bl808.git
synced 2025-03-18 04:54:52 +00:00
WIP: Remoteproc support for bl808
This commit is contained in:
parent
e17d63c2b6
commit
9348e10221
3 changed files with 400 additions and 0 deletions
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@ -161,6 +161,15 @@ config PRU_REMOTEPROC
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processors on various TI SoCs. It's safe to say N here if you're
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not interested in the PRU or if you are unsure.
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config BL808_REMOTEPROC
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tristate "BL808 remoteproc support"
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select MAILBOX
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help
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Support for Bouffalo Labs BL808 remote processors M0/LP
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subsystem via the remote processor framework.
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Say Y or M here to enable
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config QCOM_PIL_INFO
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tristate
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@ -39,3 +39,5 @@ obj-$(CONFIG_STM32_RPROC) += stm32_rproc.o
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obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o
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obj-$(CONFIG_TI_K3_R5_REMOTEPROC) += ti_k3_r5_remoteproc.o
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obj-$(CONFIG_XLNX_R5_REMOTEPROC) += xlnx_r5_remoteproc.o
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obj-$(CONFIG_BL808_REMOTEPROC) += bl808_remoteproc.o
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389
drivers/remoteproc/bl808_remoteproc.c
Normal file
389
drivers/remoteproc/bl808_remoteproc.c
Normal file
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@ -0,0 +1,389 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Remote processor machine-specific module for bl808
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*
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* Copyright (C) 2023 Justin Hammond
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*/
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#include <linux/bitops.h>
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#include <linux/clk.h>
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#include <linux/reset.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_reserved_mem.h>
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#include <linux/platform_device.h>
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#include <linux/remoteproc.h>
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#include <linux/mailbox_client.h>
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#include "remoteproc_internal.h"
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/**
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* struct bl808_rproc - bl808 remote processor instance state
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* @rproc: rproc handle
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* @mbox: the mailbox channel
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* @client: the mailbox client
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*/
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struct bl808_rproc {
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struct rproc *rproc;
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struct mbox_chan *mbox;
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struct mbox_client client;
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};
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/* The feature bitmap for virtio rpmsg */
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#define VIRTIO_RPMSG_F_NS 0 /* RP supports name service notifications */
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#define FW_RSC_U32_ADDR_ANY 0xFFFFFFFFUL
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#define RPMSG_VDEV_DFEATURES (1 << VIRTIO_RPMSG_F_NS)
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/* VirtIO rpmsg device id */
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#define VIRTIO_ID_RPMSG_ 7
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/* Resource table entries */
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#define NUM_VRINGS 0x02
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#define VRING_ALIGN 0x1000
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#define RING_TX FW_RSC_U32_ADDR_ANY
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#define RING_RX FW_RSC_U32_ADDR_ANY
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#define VRING_SIZE 2
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#define NUM_TABLE_ENTRIES 1
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#define NO_RESOURCE_ENTRIES 1
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/* this is normally in the header of the ELF files for firmware
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* but since M0 is already running and there isn't a ELF file on
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* flash for it, we fudge the resource table header to statically
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* specify our virtio rings etc
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*/
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struct remote_resource_table {
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u32 version;
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u32 num;
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u32 reserved[2];
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u32 offset[NO_RESOURCE_ENTRIES];
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/* rpmsg vdev entry */
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u32 type;
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struct fw_rsc_vdev rpmsg_vdev;
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struct fw_rsc_vdev_vring rpmsg_vring0;
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struct fw_rsc_vdev_vring rpmsg_vring1;
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}__packed;
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/* this is our fudged ELF Resource Table Header setup with
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* one rpmsg virtio device and two virtio rings
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*/
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struct remote_resource_table resources = {
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/* Version */
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.version = 1,
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/* NUmber of table entries */
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.num = NUM_TABLE_ENTRIES,
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/* reserved fields */
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.reserved = {0, 0,},
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/* Offsets of rsc entries */
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.offset[0] = offsetof(struct remote_resource_table, type),
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.type = RSC_VDEV,
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/* Virtio device entry */
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{
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VIRTIO_ID_RPMSG_, 0, RPMSG_VDEV_DFEATURES, 0, 0, 0,
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NUM_VRINGS, {0, 0},
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},
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/* Vring rsc entry - part of vdev rsc entry */
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{RING_TX, VRING_ALIGN, VRING_SIZE, 1, 0},
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{RING_RX, VRING_ALIGN, VRING_SIZE, 2, 0},
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};
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/* return a pointer to our resource table
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*/
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struct resource_table *bl808_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *size)
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{
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struct device *dev = rproc->dev.parent;
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dev_dbg(dev, "bl808_rproc_get_loaded_rsc_table");
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*size = sizeof(resources);
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return (struct resource_table *)&resources;
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}
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/* allocate vdev0buffer */
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static int bl808_rproc_mem_alloc(struct rproc *rproc,
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struct rproc_mem_entry *mem)
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{
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struct device *dev = rproc->dev.parent;
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void *va;
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dev_dbg(dev, "Allocating memory region");
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va = ioremap_wc(mem->dma, mem->len);
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if (!va) {
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dev_err(dev, "Unable to map memory region: %pa+%zx\n",
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&mem->dma, mem->len);
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return -ENOMEM;
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}
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/* Update memory entry va */
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mem->va = va;
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dev_dbg(dev, "Allocated memory region: %pa+%zx -> %p", &mem->dma, mem->len, mem->va);
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return 0;
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}
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/* release vdev0buffer */
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static int bl808_rproc_mem_release(struct rproc *rproc,
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struct rproc_mem_entry *mem)
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{
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struct device *dev = rproc->dev.parent;
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dev_dbg(dev, "release memory region");
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iounmap(mem->va);
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return 0;
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}
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/*
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* Pull the memory ranges for virtio from the device tree and register them
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*/
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static int bl808_rproc_setupmem(struct rproc *rproc)
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{
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struct device *dev = rproc->dev.parent;
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struct device_node *np = dev->of_node;
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struct rproc_mem_entry *mem;
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struct reserved_mem *rmem;
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struct of_phandle_iterator it;
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int index = 0;
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dev_dbg(dev, "bl808_rproc_parse_fw %s", np->name);
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of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
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while (of_phandle_iterator_next(&it) == 0) {
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dev_dbg(dev, "memory-region %s", it.node->name);
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rmem = of_reserved_mem_lookup(it.node);
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if (!rmem) {
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dev_err(dev, "unable to acquire memory-region\n");
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return -EINVAL;
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}
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dev_dbg(dev, "memory-region %s", it.node->name);
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/* No need to map vdev buffer */
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if (strcmp(it.node->name, "vdev0buffer")) {
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/* Register memory region */
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dev_dbg(dev, "registering memory region %s", it.node->name);
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mem = rproc_mem_entry_init(dev, NULL,
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(dma_addr_t)rmem->base,
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rmem->size, rmem->base,
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bl808_rproc_mem_alloc,
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bl808_rproc_mem_release,
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it.node->name);
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} else {
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/* Register reserved memory for vdev buffer allocation */
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dev_dbg(dev, "registering reserved memory region %s", it.node->name);
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mem = rproc_of_resm_mem_entry_init(dev, index,
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rmem->size,
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rmem->base,
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it.node->name);
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}
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if (!mem) {
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dev_err(dev, "unable to allocate memory entry %s", it.node->name);
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return -ENOMEM;
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}
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rproc_add_carveout(rproc, mem);
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index++;
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}
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return 0;
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}
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/* M0 is already started. Do Nothing
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*/
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static int bl808_rproc_start(struct rproc *rproc)
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{
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struct device *dev = rproc->dev.parent;
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dev_dbg(dev, "bl808_rproc_start");
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return 0;
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}
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/* We don't want to stop M0, as it will crash. Do Nothing
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*/
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static int bl808_rproc_stop(struct rproc *rproc)
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{
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struct device *dev = rproc->dev.parent;
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dev_dbg(dev, "bl808_rproc_stop");
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return 0;
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}
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/* kick the virtqueue to let M0 know there is a update to the vring
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*/
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static void bl808_rproc_kick(struct rproc *rproc, int vqid)
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{
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struct device *dev = rproc->dev.parent;
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struct bl808_rproc *drproc = (struct bl808_rproc *)rproc->priv;
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/* Kick the other CPU to let it know the vrings are updated */
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dev_dbg(dev, "bl808_rproc_kick %d", vqid);
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mbox_send_message(drproc->mbox, (void*)vqid);
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}
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/* M0 signaled us there is a update on the vring, check it
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*/
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static void bflb_rproc_mbox_callback(struct mbox_client *client, void *data)
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{
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struct device *dev = client->dev;
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struct rproc *rproc = dev_get_drvdata(dev);
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u32 vqid = (u32)data;
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dev_dbg(dev, "bflb_rproc_mbox_callback %d", vqid);
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if (vqid > 0 && vqid < 3)
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rproc_vq_interrupt(rproc, vqid);
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else
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dev_err(dev, "bflb_rproc_mbox_callback: Invalid vqid %d", vqid);
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}
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/* M0 is already running when we boot
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* so just attach to it.
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* we also register a mailbox to get kicks from M0 when vrings are updated
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*/
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static int bl808_rproc_attach(struct rproc *rproc)
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{
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struct device *dev = &rproc->dev;
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struct bl808_rproc *drproc = (struct bl808_rproc *)rproc->priv;
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int ret;
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/* request the mailbox */
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struct mbox_client *vq1_mbox = &drproc->client;
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vq1_mbox->dev = dev->parent;
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dev_dbg(vq1_mbox->dev, "bl808_rproc_attachasdfadfsdf: Attaching to %s", rproc->name);
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vq1_mbox->tx_done = NULL;
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vq1_mbox->rx_callback = bflb_rproc_mbox_callback;
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vq1_mbox->tx_block = false;
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vq1_mbox->knows_txdone = false;
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drproc->mbox = mbox_request_channel(vq1_mbox, 0);
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if (IS_ERR(drproc->mbox)) {
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ret = -EBUSY;
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dev_err(dev, "mbox_request_channel failed: %ld\n",
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PTR_ERR(drproc->mbox));
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return ret;
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}
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dev_dbg(dev, "bl808_rproc_attach: Attaching to %s", rproc->name);
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return 0;
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}
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/* Detach. Do Nothing? */
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static int bl808_rproc_detach(struct rproc *rproc)
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{
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struct device *dev = rproc->dev.parent;
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dev_dbg(dev, "bl808_rproc_detach: Detaching from %s", rproc->name);
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return 0;
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}
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static const struct rproc_ops bl808_rproc_ops = {
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.start = bl808_rproc_start,
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.stop = bl808_rproc_stop,
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.attach = bl808_rproc_attach,
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.detach = bl808_rproc_detach,
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.kick = bl808_rproc_kick,
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.prepare = bl808_rproc_setupmem,
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.get_loaded_rsc_table = bl808_rproc_get_loaded_rsc_table,
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};
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static int bl808_rproc_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct bl808_rproc *drproc;
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struct rproc *rproc;
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int ret;
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dev_dbg(dev, "bl808_rproc_probe ");
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rproc = rproc_alloc(dev, "M0", &bl808_rproc_ops, NULL,
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sizeof(*drproc));
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if (!rproc) {
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ret = -ENOMEM;
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goto free_mem;
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}
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/* error recovery is not supported at present */
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rproc->recovery_disabled = true;
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/* M0 is running when linux boots */
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//atomic_inc(&rproc->power);
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rproc->state = RPROC_DETACHED;
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drproc = rproc->priv;
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drproc->rproc = rproc;
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rproc->has_iommu = false;
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ret = rproc_add(rproc);
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if (ret) {
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dev_err(dev, "rproc_add failed: %d\n", ret);
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goto free_rproc;
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}
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platform_set_drvdata(pdev, rproc);
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dev_dbg(dev, "rproc_add success");
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return 0;
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free_rproc:
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rproc_free(rproc);
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free_mem:
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if (dev->of_node)
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of_reserved_mem_device_release(dev);
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return ret;
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}
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static int bl808_rproc_remove(struct platform_device *pdev)
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{
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struct rproc *rproc = platform_get_drvdata(pdev);
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struct device *dev = &pdev->dev;
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dev_dbg(dev, "bl808_rproc_remove");
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/*XXX TODO: we need to unregister our mailbox? */
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rproc_del(rproc);
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rproc_free(rproc);
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if (dev->of_node)
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of_reserved_mem_device_release(dev);
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return 0;
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}
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static const struct of_device_id davinci_rproc_of_match[] __maybe_unused = {
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{ .compatible = "bflb,bl808-rproc", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, davinci_rproc_of_match);
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static struct platform_driver bl808_rproc_driver = {
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.probe = bl808_rproc_probe,
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.remove = bl808_rproc_remove,
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.driver = {
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.name = "bl808-rproc",
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.of_match_table = of_match_ptr(davinci_rproc_of_match),
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},
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};
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module_platform_driver(bl808_rproc_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("justin@dynam.ac");
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MODULE_DESCRIPTION("bl808 Remote Processor control driver");
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