326 lines
8.2 KiB
C
326 lines
8.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Texas Instruments' K3 System Controller Driver
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*
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* Copyright (C) 2017-2018 Texas Instruments Incorporated - http://www.ti.com/
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* Lokesh Vutla <lokeshvutla@ti.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <remoteproc.h>
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#include <errno.h>
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#include <mailbox.h>
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#include <dm/device_compat.h>
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#include <linux/soc/ti/k3-sec-proxy.h>
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#define K3_MSG_R5_TO_M3_M3FW 0x8105
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#define K3_MSG_M3_TO_R5_CERT_RESULT 0x8805
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#define K3_MSG_M3_TO_R5_BOOT_NOTIFICATION 0x000A
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#define K3_FLAGS_MSG_CERT_AUTH_PASS 0x555555
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#define K3_FLAGS_MSG_CERT_AUTH_FAIL 0xffffff
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/**
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* struct k3_sysctrler_msg_hdr - Generic Header for Messages and responses.
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* @cmd_id: Message ID. One of K3_MSG_*
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* @host_id: Host ID of the message
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* @seq_ne: Message identifier indicating a transfer sequence.
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* @flags: Flags for the message.
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*/
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struct k3_sysctrler_msg_hdr {
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u16 cmd_id;
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u8 host_id;
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u8 seq_nr;
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u32 flags;
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} __packed;
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/**
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* struct k3_sysctrler_load_msg - Message format for Firmware loading
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* @hdr: Generic message hdr
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* @buffer_address: Address at which firmware is located.
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* @buffer_size: Size of the firmware.
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*/
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struct k3_sysctrler_load_msg {
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struct k3_sysctrler_msg_hdr hdr;
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u32 buffer_address;
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u32 buffer_size;
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} __packed;
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/**
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* struct k3_sysctrler_boot_notification_msg - Message format for boot
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* notification
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* @checksum: Checksum for the entire message
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* @reserved: Reserved for future use.
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* @hdr: Generic message hdr
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*/
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struct k3_sysctrler_boot_notification_msg {
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u16 checksum;
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u16 reserved;
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struct k3_sysctrler_msg_hdr hdr;
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} __packed;
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/**
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* struct k3_sysctrler_desc - Description of SoC integration.
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* @host_id: Host identifier representing the compute entity
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* @max_rx_timeout_ms: Timeout for communication with SoC (in Milliseconds)
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* @max_msg_size: Maximum size of data per message that can be handled.
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*/
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struct k3_sysctrler_desc {
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u8 host_id;
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int max_rx_timeout_us;
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int max_msg_size;
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};
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/**
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* struct k3_sysctrler_privdata - Structure representing System Controller data.
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* @chan_tx: Transmit mailbox channel
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* @chan_rx: Receive mailbox channel
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* @desc: SoC description for this instance
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* @seq_nr: Counter for number of messages sent.
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*/
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struct k3_sysctrler_privdata {
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struct mbox_chan chan_tx;
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struct mbox_chan chan_rx;
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struct k3_sysctrler_desc *desc;
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u32 seq_nr;
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};
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static inline
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void k3_sysctrler_load_msg_setup(struct k3_sysctrler_load_msg *fw,
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struct k3_sysctrler_privdata *priv,
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ulong addr, ulong size)
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{
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fw->hdr.cmd_id = K3_MSG_R5_TO_M3_M3FW;
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fw->hdr.host_id = priv->desc->host_id;
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fw->hdr.seq_nr = priv->seq_nr++;
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fw->hdr.flags = 0x0;
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fw->buffer_address = addr;
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fw->buffer_size = size;
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}
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static int k3_sysctrler_load_response(u32 *buf)
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{
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struct k3_sysctrler_load_msg *fw;
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fw = (struct k3_sysctrler_load_msg *)buf;
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/* Check for proper response ID */
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if (fw->hdr.cmd_id != K3_MSG_M3_TO_R5_CERT_RESULT) {
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dev_err(dev, "%s: Command expected 0x%x, but received 0x%x\n",
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__func__, K3_MSG_M3_TO_R5_CERT_RESULT, fw->hdr.cmd_id);
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return -EINVAL;
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}
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/* Check for certificate authentication result */
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if (fw->hdr.flags == K3_FLAGS_MSG_CERT_AUTH_FAIL) {
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dev_err(dev, "%s: Firmware certificate authentication failed\n",
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__func__);
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return -EINVAL;
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} else if (fw->hdr.flags != K3_FLAGS_MSG_CERT_AUTH_PASS) {
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dev_err(dev, "%s: Firmware Load response Invalid %d\n",
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__func__, fw->hdr.flags);
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return -EINVAL;
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}
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debug("%s: Firmware authentication passed\n", __func__);
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return 0;
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}
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static int k3_sysctrler_boot_notification_response(u32 *buf)
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{
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struct k3_sysctrler_boot_notification_msg *boot;
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boot = (struct k3_sysctrler_boot_notification_msg *)buf;
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/* ToDo: Verify checksum */
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/* Check for proper response ID */
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if (boot->hdr.cmd_id != K3_MSG_M3_TO_R5_BOOT_NOTIFICATION) {
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dev_err(dev, "%s: Command expected 0x%x, but received 0x%x\n",
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__func__, K3_MSG_M3_TO_R5_BOOT_NOTIFICATION,
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boot->hdr.cmd_id);
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return -EINVAL;
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}
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debug("%s: Boot notification received\n", __func__);
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return 0;
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}
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/**
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* k3_sysctrler_load() - Loadup the K3 remote processor
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* @dev: corresponding K3 remote processor device
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* @addr: Address in memory where image binary is stored
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* @size: Size in bytes of the image binary
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*
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* Return: 0 if all goes good, else appropriate error message.
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*/
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static int k3_sysctrler_load(struct udevice *dev, ulong addr, ulong size)
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{
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struct k3_sysctrler_privdata *priv = dev_get_priv(dev);
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struct k3_sysctrler_load_msg firmware;
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struct k3_sec_proxy_msg msg;
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int ret;
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debug("%s: Loading binary from 0x%08lX, size 0x%08lX\n",
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__func__, addr, size);
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memset(&firmware, 0, sizeof(firmware));
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memset(&msg, 0, sizeof(msg));
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/* Setup the message */
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k3_sysctrler_load_msg_setup(&firmware, priv, addr, size);
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msg.len = sizeof(firmware);
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msg.buf = (u32 *)&firmware;
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/* Send the message */
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ret = mbox_send(&priv->chan_tx, &msg);
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if (ret) {
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dev_err(dev, "%s: Firmware Loading failed. ret = %d\n",
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__func__, ret);
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return ret;
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}
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/* Receive the response */
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ret = mbox_recv(&priv->chan_rx, &msg, priv->desc->max_rx_timeout_us);
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if (ret) {
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dev_err(dev, "%s: Firmware Load response failed. ret = %d\n",
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__func__, ret);
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return ret;
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}
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/* Process the response */
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ret = k3_sysctrler_load_response(msg.buf);
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if (ret)
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return ret;
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debug("%s: Firmware Loaded successfully on dev %s\n",
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__func__, dev->name);
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return 0;
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}
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/**
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* k3_sysctrler_start() - Start the remote processor
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* Note that while technically the K3 system controller starts up
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* automatically after its firmware got loaded we still want to
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* utilize the rproc start operation for other startup-related
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* tasks.
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* @dev: device to operate upon
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*
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* Return: 0 if all went ok, else return appropriate error
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*/
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static int k3_sysctrler_start(struct udevice *dev)
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{
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struct k3_sysctrler_privdata *priv = dev_get_priv(dev);
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struct k3_sec_proxy_msg msg;
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int ret;
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debug("%s(dev=%p)\n", __func__, dev);
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/* Receive the boot notification. Note that it is sent only once. */
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ret = mbox_recv(&priv->chan_rx, &msg, priv->desc->max_rx_timeout_us);
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if (ret) {
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dev_err(dev, "%s: Boot Notification response failed. ret = %d\n",
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__func__, ret);
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return ret;
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}
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/* Process the response */
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ret = k3_sysctrler_boot_notification_response(msg.buf);
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if (ret)
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return ret;
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debug("%s: Boot notification received successfully on dev %s\n",
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__func__, dev->name);
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return 0;
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}
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static const struct dm_rproc_ops k3_sysctrler_ops = {
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.load = k3_sysctrler_load,
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.start = k3_sysctrler_start,
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};
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/**
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* k3_of_to_priv() - generate private data from device tree
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* @dev: corresponding k3 remote processor device
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* @priv: pointer to driver specific private data
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*
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* Return: 0 if all goes good, else appropriate error message.
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*/
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static int k3_of_to_priv(struct udevice *dev,
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struct k3_sysctrler_privdata *priv)
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{
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int ret;
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ret = mbox_get_by_name(dev, "tx", &priv->chan_tx);
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if (ret) {
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dev_err(dev, "%s: Acquiring Tx channel failed. ret = %d\n",
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__func__, ret);
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return ret;
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}
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ret = mbox_get_by_name(dev, "rx", &priv->chan_rx);
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if (ret) {
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dev_err(dev, "%s: Acquiring Rx channel failed. ret = %d\n",
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__func__, ret);
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return ret;
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}
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return 0;
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}
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/**
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* k3_sysctrler_probe() - Basic probe
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* @dev: corresponding k3 remote processor device
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*
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* Return: 0 if all goes good, else appropriate error message.
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*/
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static int k3_sysctrler_probe(struct udevice *dev)
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{
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struct k3_sysctrler_privdata *priv;
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int ret;
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debug("%s(dev=%p)\n", __func__, dev);
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priv = dev_get_priv(dev);
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ret = k3_of_to_priv(dev, priv);
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if (ret) {
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dev_err(dev, "%s: Probe failed with error %d\n", __func__, ret);
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return ret;
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}
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priv->desc = (void *)dev_get_driver_data(dev);
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priv->seq_nr = 0;
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return 0;
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}
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static const struct k3_sysctrler_desc k3_sysctrler_am654_desc = {
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.host_id = 4, /* HOST_ID_R5_1 */
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.max_rx_timeout_us = 800000,
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.max_msg_size = 60,
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};
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static const struct udevice_id k3_sysctrler_ids[] = {
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{
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.compatible = "ti,am654-system-controller",
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.data = (ulong)&k3_sysctrler_am654_desc,
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},
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{}
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};
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U_BOOT_DRIVER(k3_sysctrler) = {
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.name = "k3_system_controller",
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.of_match = k3_sysctrler_ids,
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.id = UCLASS_REMOTEPROC,
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.ops = &k3_sysctrler_ops,
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.probe = k3_sysctrler_probe,
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.priv_auto_alloc_size = sizeof(struct k3_sysctrler_privdata),
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};
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