+++ /dev/null
-/*
- * Copyright (C) ST-Ericsson AB 2012
- * Author: Sjur Brændeland <sjur.brandeland@stericsson.com>
- * License terms: GNU General Public License (GPL), version 2
- */
-
-#include <linux/module.h>
-#include <linux/dma-mapping.h>
-#include <linux/remoteproc.h>
-#include <linux/ste_modem_shm.h>
-#include "remoteproc_internal.h"
-
-#define SPROC_FW_SIZE (50 * 4096)
-#define SPROC_MAX_TOC_ENTRIES 32
-#define SPROC_MAX_NOTIFY_ID 14
-#define SPROC_RESOURCE_NAME "rsc-table"
-#define SPROC_MODEM_NAME "ste-modem"
-#define SPROC_MODEM_FIRMWARE SPROC_MODEM_NAME "-fw.bin"
-
-#define sproc_dbg(sproc, fmt, ...) \
- dev_dbg(&sproc->mdev->pdev.dev, fmt, ##__VA_ARGS__)
-#define sproc_err(sproc, fmt, ...) \
- dev_err(&sproc->mdev->pdev.dev, fmt, ##__VA_ARGS__)
-
-/* STE-modem control structure */
-struct sproc {
- struct rproc *rproc;
- struct ste_modem_device *mdev;
- int error;
- void *fw_addr;
- size_t fw_size;
- dma_addr_t fw_dma_addr;
-};
-
-/* STE-Modem firmware entry */
-struct ste_toc_entry {
- __le32 start;
- __le32 size;
- __le32 flags;
- __le32 entry_point;
- __le32 load_addr;
- char name[12];
-};
-
-/*
- * The Table Of Content is located at the start of the firmware image and
- * at offset zero in the shared memory region. The resource table typically
- * contains the initial boot image (boot strap) and other information elements
- * such as remoteproc resource table. Each entry is identified by a unique
- * name.
- */
-struct ste_toc {
- struct ste_toc_entry table[SPROC_MAX_TOC_ENTRIES];
-};
-
-/* Loads the firmware to shared memory. */
-static int sproc_load_segments(struct rproc *rproc, const struct firmware *fw)
-{
- struct sproc *sproc = rproc->priv;
-
- memcpy(sproc->fw_addr, fw->data, fw->size);
-
- return 0;
-}
-
-/* Find the entry for resource table in the Table of Content */
-static const struct ste_toc_entry *sproc_find_rsc_entry(const void *data)
-{
- int i;
- const struct ste_toc *toc = data;
-
- /* Search the table for the resource table */
- for (i = 0; i < SPROC_MAX_TOC_ENTRIES &&
- toc->table[i].start != 0xffffffff; i++) {
- if (!strncmp(toc->table[i].name, SPROC_RESOURCE_NAME,
- sizeof(toc->table[i].name)))
- return &toc->table[i];
- }
-
- return NULL;
-}
-
-/* Find the resource table inside the remote processor's firmware. */
-static struct resource_table *
-sproc_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
- int *tablesz)
-{
- struct sproc *sproc = rproc->priv;
- struct resource_table *table;
- const struct ste_toc_entry *entry;
-
- if (!fw)
- return NULL;
-
- entry = sproc_find_rsc_entry(fw->data);
- if (!entry) {
- sproc_err(sproc, "resource table not found in fw\n");
- return NULL;
- }
-
- table = (void *)(fw->data + entry->start);
-
- /* sanity check size and offset of resource table */
- if (entry->start > SPROC_FW_SIZE ||
- entry->size > SPROC_FW_SIZE ||
- fw->size > SPROC_FW_SIZE ||
- entry->start + entry->size > fw->size ||
- sizeof(struct resource_table) > entry->size) {
- sproc_err(sproc, "bad size of fw or resource table\n");
- return NULL;
- }
-
- /* we don't support any version beyond the first */
- if (table->ver != 1) {
- sproc_err(sproc, "unsupported fw ver: %d\n", table->ver);
- return NULL;
- }
-
- /* make sure reserved bytes are zeroes */
- if (table->reserved[0] || table->reserved[1]) {
- sproc_err(sproc, "non zero reserved bytes\n");
- return NULL;
- }
-
- /* make sure the offsets array isn't truncated */
- if (table->num > SPROC_MAX_TOC_ENTRIES ||
- table->num * sizeof(table->offset[0]) +
- sizeof(struct resource_table) > entry->size) {
- sproc_err(sproc, "resource table incomplete\n");
- return NULL;
- }
-
- /* If the fw size has grown, release the previous fw allocation */
- if (SPROC_FW_SIZE < fw->size) {
- sproc_err(sproc, "Insufficient space for fw (%d < %zd)\n",
- SPROC_FW_SIZE, fw->size);
- return NULL;
- }
-
- sproc->fw_size = fw->size;
- *tablesz = entry->size;
-
- return table;
-}
-
-/* Find the resource table inside the remote processor's firmware. */
-static struct resource_table *
-sproc_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *fw)
-{
- struct sproc *sproc = rproc->priv;
- const struct ste_toc_entry *entry;
-
- if (!fw || !sproc->fw_addr)
- return NULL;
-
- entry = sproc_find_rsc_entry(sproc->fw_addr);
- if (!entry) {
- sproc_err(sproc, "resource table not found in fw\n");
- return NULL;
- }
-
- return sproc->fw_addr + entry->start;
-}
-
-/* STE modem firmware handler operations */
-static const struct rproc_fw_ops sproc_fw_ops = {
- .load = sproc_load_segments,
- .find_rsc_table = sproc_find_rsc_table,
- .find_loaded_rsc_table = sproc_find_loaded_rsc_table,
-};
-
-/* Kick the modem with specified notification id */
-static void sproc_kick(struct rproc *rproc, int vqid)
-{
- struct sproc *sproc = rproc->priv;
-
- sproc_dbg(sproc, "kick vqid:%d\n", vqid);
-
- /*
- * We need different notification IDs for RX and TX so add
- * an offset on TX notification IDs.
- */
- sproc->mdev->ops.kick(sproc->mdev, vqid + SPROC_MAX_NOTIFY_ID);
-}
-
-/* Received a kick from a modem, kick the virtqueue */
-static void sproc_kick_callback(struct ste_modem_device *mdev, int vqid)
-{
- struct sproc *sproc = mdev->drv_data;
-
- if (rproc_vq_interrupt(sproc->rproc, vqid) == IRQ_NONE)
- sproc_dbg(sproc, "no message was found in vqid %d\n", vqid);
-}
-
-static struct ste_modem_dev_cb sproc_dev_cb = {
- .kick = sproc_kick_callback,
-};
-
-/* Start the STE modem */
-static int sproc_start(struct rproc *rproc)
-{
- struct sproc *sproc = rproc->priv;
- int i, err;
-
- sproc_dbg(sproc, "start ste-modem\n");
-
- /* Sanity test the max_notifyid */
- if (rproc->max_notifyid > SPROC_MAX_NOTIFY_ID) {
- sproc_err(sproc, "Notification IDs too high:%d\n",
- rproc->max_notifyid);
- return -EINVAL;
- }
-
- /* Subscribe to notifications */
- for (i = 0; i <= rproc->max_notifyid; i++) {
- err = sproc->mdev->ops.kick_subscribe(sproc->mdev, i);
- if (err) {
- sproc_err(sproc,
- "subscription of kicks failed:%d\n", err);
- return err;
- }
- }
-
- /* Request modem start-up*/
- return sproc->mdev->ops.power(sproc->mdev, true);
-}
-
-/* Stop the STE modem */
-static int sproc_stop(struct rproc *rproc)
-{
- struct sproc *sproc = rproc->priv;
-
- sproc_dbg(sproc, "stop ste-modem\n");
-
- return sproc->mdev->ops.power(sproc->mdev, false);
-}
-
-static struct rproc_ops sproc_ops = {
- .start = sproc_start,
- .stop = sproc_stop,
- .kick = sproc_kick,
-};
-
-/* STE modem device is unregistered */
-static int sproc_drv_remove(struct platform_device *pdev)
-{
- struct ste_modem_device *mdev =
- container_of(pdev, struct ste_modem_device, pdev);
- struct sproc *sproc = mdev->drv_data;
-
- sproc_dbg(sproc, "remove ste-modem\n");
-
- /* Reset device callback functions */
- sproc->mdev->ops.setup(sproc->mdev, NULL);
-
- /* Unregister as remoteproc device */
- rproc_del(sproc->rproc);
- dma_free_coherent(sproc->rproc->dev.parent, SPROC_FW_SIZE,
- sproc->fw_addr, sproc->fw_dma_addr);
- rproc_free(sproc->rproc);
-
- mdev->drv_data = NULL;
-
- return 0;
-}
-
-/* Handle probe of a modem device */
-static int sproc_probe(struct platform_device *pdev)
-{
- struct ste_modem_device *mdev =
- container_of(pdev, struct ste_modem_device, pdev);
- struct sproc *sproc;
- struct rproc *rproc;
- int err;
-
- dev_dbg(&mdev->pdev.dev, "probe ste-modem\n");
-
- if (!mdev->ops.setup || !mdev->ops.kick || !mdev->ops.kick_subscribe ||
- !mdev->ops.power) {
- dev_err(&mdev->pdev.dev, "invalid mdev ops\n");
- return -EINVAL;
- }
-
- rproc = rproc_alloc(&mdev->pdev.dev, mdev->pdev.name, &sproc_ops,
- SPROC_MODEM_FIRMWARE, sizeof(*sproc));
- if (!rproc)
- return -ENOMEM;
-
- sproc = rproc->priv;
- sproc->mdev = mdev;
- sproc->rproc = rproc;
- rproc->has_iommu = false;
- mdev->drv_data = sproc;
-
- /* Provide callback functions to modem device */
- sproc->mdev->ops.setup(sproc->mdev, &sproc_dev_cb);
-
- /* Set the STE-modem specific firmware handler */
- rproc->fw_ops = &sproc_fw_ops;
-
- /*
- * STE-modem requires the firmware to be located
- * at the start of the shared memory region. So we need to
- * reserve space for firmware at the start.
- */
- sproc->fw_addr = dma_alloc_coherent(rproc->dev.parent, SPROC_FW_SIZE,
- &sproc->fw_dma_addr,
- GFP_KERNEL);
- if (!sproc->fw_addr) {
- sproc_err(sproc, "Cannot allocate memory for fw\n");
- err = -ENOMEM;
- goto free_rproc;
- }
-
- /* Register as a remoteproc device */
- err = rproc_add(rproc);
- if (err)
- goto free_mem;
-
- return 0;
-
-free_mem:
- dma_free_coherent(rproc->dev.parent, SPROC_FW_SIZE,
- sproc->fw_addr, sproc->fw_dma_addr);
-free_rproc:
- /* Reset device data upon error */
- mdev->drv_data = NULL;
- rproc_free(rproc);
- return err;
-}
-
-static struct platform_driver sproc_driver = {
- .driver = {
- .name = SPROC_MODEM_NAME,
- },
- .probe = sproc_probe,
- .remove = sproc_drv_remove,
-};
-
-module_platform_driver(sproc_driver);
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("STE Modem driver using the Remote Processor Framework");
projects / platform / kernel / linux-starfive.git / commitdiff