--- /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 struct ste_toc_entry *sproc_find_rsc_entry(const struct firmware *fw)
+{
+ int i;
+ struct ste_toc *toc;
+
+ if (!fw)
+ return NULL;
+
+ toc = (void *)fw->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))) {
+ if (toc->table[i].start > fw->size)
+ return NULL;
+ 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;
+ struct ste_toc_entry *entry;
+
+ entry = sproc_find_rsc_entry(fw);
+ 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;
+}
+
+/* STE modem firmware handler operations */
+const struct rproc_fw_ops sproc_fw_ops = {
+ .load = sproc_load_segments,
+ .find_rsc_table = sproc_find_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);
+}
+
+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);
+ rproc_put(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;
+ 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_rproc;
+
+ return 0;
+
+free_rproc:
+ /* Reset device data upon error */
+ mdev->drv_data = NULL;
+ rproc_put(rproc);
+ return err;
+}
+
+static struct platform_driver sproc_driver = {
+ .driver = {
+ .name = SPROC_MODEM_NAME,
+ .owner = THIS_MODULE,
+ },
+ .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 / firefly-linux-kernel-4.4.55.git / blobdiff