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// SPDX-License-Identifier: GPL-2.0+
/*
* Texas Instruments' K3 System Controller Driver
*
* Copyright (C) 2017-2018 Texas Instruments Incorporated - https://www.ti.com/
* Lokesh Vutla <lokeshvutla@ti.com>
*/
#include <common.h>
#include <dm.h>
#include <log.h>
#include <remoteproc.h>
#include <errno.h>
#include <mailbox.h>
#include <dm/device_compat.h>
#include <linux/soc/ti/k3-sec-proxy.h>
#define K3_MSG_R5_TO_M3_M3FW 0x8105
#define K3_MSG_M3_TO_R5_CERT_RESULT 0x8805
#define K3_MSG_M3_TO_R5_BOOT_NOTIFICATION 0x000A
#define K3_FLAGS_MSG_CERT_AUTH_PASS 0x555555
#define K3_FLAGS_MSG_CERT_AUTH_FAIL 0xffffff
/**
* struct k3_sysctrler_msg_hdr - Generic Header for Messages and responses.
* @cmd_id: Message ID. One of K3_MSG_*
* @host_id: Host ID of the message
* @seq_ne: Message identifier indicating a transfer sequence.
* @flags: Flags for the message.
*/
struct k3_sysctrler_msg_hdr {
u16 cmd_id;
u8 host_id;
u8 seq_nr;
u32 flags;
} __packed;
/**
* struct k3_sysctrler_load_msg - Message format for Firmware loading
* @hdr: Generic message hdr
* @buffer_address: Address at which firmware is located.
* @buffer_size: Size of the firmware.
*/
struct k3_sysctrler_load_msg {
struct k3_sysctrler_msg_hdr hdr;
u32 buffer_address;
u32 buffer_size;
} __packed;
/**
* struct k3_sysctrler_boot_notification_msg - Message format for boot
* notification
* @checksum: Checksum for the entire message
* @reserved: Reserved for future use.
* @hdr: Generic message hdr
*/
struct k3_sysctrler_boot_notification_msg {
u16 checksum;
u16 reserved;
struct k3_sysctrler_msg_hdr hdr;
} __packed;
/**
* struct k3_sysctrler_desc - Description of SoC integration.
* @host_id: Host identifier representing the compute entity
* @max_rx_timeout_ms: Timeout for communication with SoC (in Milliseconds)
* @max_msg_size: Maximum size of data per message that can be handled.
*/
struct k3_sysctrler_desc {
u8 host_id;
int max_rx_timeout_us;
int max_msg_size;
};
/**
* struct k3_sysctrler_privdata - Structure representing System Controller data.
* @chan_tx: Transmit mailbox channel
* @chan_rx: Receive mailbox channel
* @chan_boot_notify: Boot notification channel
* @desc: SoC description for this instance
* @seq_nr: Counter for number of messages sent.
* @has_boot_notify: Has separate boot notification channel
*/
struct k3_sysctrler_privdata {
struct mbox_chan chan_tx;
struct mbox_chan chan_rx;
struct mbox_chan chan_boot_notify;
struct k3_sysctrler_desc *desc;
u32 seq_nr;
bool has_boot_notify;
};
static inline
void k3_sysctrler_load_msg_setup(struct k3_sysctrler_load_msg *fw,
struct k3_sysctrler_privdata *priv,
ulong addr, ulong size)
{
fw->hdr.cmd_id = K3_MSG_R5_TO_M3_M3FW;
fw->hdr.host_id = priv->desc->host_id;
fw->hdr.seq_nr = priv->seq_nr++;
fw->hdr.flags = 0x0;
fw->buffer_address = addr;
fw->buffer_size = size;
}
static int k3_sysctrler_load_response(struct udevice *dev, u32 *buf)
{
struct k3_sysctrler_load_msg *fw;
fw = (struct k3_sysctrler_load_msg *)buf;
/* Check for proper response ID */
if (fw->hdr.cmd_id != K3_MSG_M3_TO_R5_CERT_RESULT) {
dev_err(dev, "%s: Command expected 0x%x, but received 0x%x\n",
__func__, K3_MSG_M3_TO_R5_CERT_RESULT, fw->hdr.cmd_id);
return -EINVAL;
}
/* Check for certificate authentication result */
if (fw->hdr.flags == K3_FLAGS_MSG_CERT_AUTH_FAIL) {
dev_err(dev, "%s: Firmware certificate authentication failed\n",
__func__);
return -EINVAL;
} else if (fw->hdr.flags != K3_FLAGS_MSG_CERT_AUTH_PASS) {
dev_err(dev, "%s: Firmware Load response Invalid %d\n",
__func__, fw->hdr.flags);
return -EINVAL;
}
debug("%s: Firmware authentication passed\n", __func__);
return 0;
}
static int k3_sysctrler_boot_notification_response(struct udevice *dev,
u32 *buf)
{
struct k3_sysctrler_boot_notification_msg *boot;
boot = (struct k3_sysctrler_boot_notification_msg *)buf;
/* ToDo: Verify checksum */
/* Check for proper response ID */
if (boot->hdr.cmd_id != K3_MSG_M3_TO_R5_BOOT_NOTIFICATION) {
dev_err(dev, "%s: Command expected 0x%x, but received 0x%x\n",
__func__, K3_MSG_M3_TO_R5_BOOT_NOTIFICATION,
boot->hdr.cmd_id);
return -EINVAL;
}
debug("%s: Boot notification received\n", __func__);
return 0;
}
/**
* k3_sysctrler_load() - Loadup the K3 remote processor
* @dev: corresponding K3 remote processor device
* @addr: Address in memory where image binary is stored
* @size: Size in bytes of the image binary
*
* Return: 0 if all goes good, else appropriate error message.
*/
static int k3_sysctrler_load(struct udevice *dev, ulong addr, ulong size)
{
struct k3_sysctrler_privdata *priv = dev_get_priv(dev);
struct k3_sysctrler_load_msg firmware;
struct k3_sec_proxy_msg msg;
int ret;
debug("%s: Loading binary from 0x%08lX, size 0x%08lX\n",
__func__, addr, size);
memset(&firmware, 0, sizeof(firmware));
memset(&msg, 0, sizeof(msg));
/* Setup the message */
k3_sysctrler_load_msg_setup(&firmware, priv, addr, size);
msg.len = sizeof(firmware);
msg.buf = (u32 *)&firmware;
/* Send the message */
ret = mbox_send(&priv->chan_tx, &msg);
if (ret) {
dev_err(dev, "%s: Firmware Loading failed. ret = %d\n",
__func__, ret);
return ret;
}
/* Receive the response */
ret = mbox_recv(&priv->chan_rx, &msg, priv->desc->max_rx_timeout_us);
if (ret) {
dev_err(dev, "%s: Firmware Load response failed. ret = %d\n",
__func__, ret);
return ret;
}
/* Process the response */
ret = k3_sysctrler_load_response(dev, msg.buf);
if (ret)
return ret;
debug("%s: Firmware Loaded successfully on dev %s\n",
__func__, dev->name);
return 0;
}
/**
* k3_sysctrler_start() - Start the remote processor
* Note that while technically the K3 system controller starts up
* automatically after its firmware got loaded we still want to
* utilize the rproc start operation for other startup-related
* tasks.
* @dev: device to operate upon
*
* Return: 0 if all went ok, else return appropriate error
*/
static int k3_sysctrler_start(struct udevice *dev)
{
struct k3_sysctrler_privdata *priv = dev_get_priv(dev);
struct k3_sec_proxy_msg msg;
int ret;
debug("%s(dev=%p)\n", __func__, dev);
/* Receive the boot notification. Note that it is sent only once. */
ret = mbox_recv(priv->has_boot_notify ? &priv->chan_boot_notify :
&priv->chan_rx, &msg, priv->desc->max_rx_timeout_us);
if (ret) {
dev_err(dev, "%s: Boot Notification response failed. ret = %d\n",
__func__, ret);
return ret;
}
/* Process the response */
ret = k3_sysctrler_boot_notification_response(dev, msg.buf);
if (ret)
return ret;
debug("%s: Boot notification received successfully on dev %s\n",
__func__, dev->name);
return 0;
}
static const struct dm_rproc_ops k3_sysctrler_ops = {
.load = k3_sysctrler_load,
.start = k3_sysctrler_start,
};
/**
* k3_of_to_priv() - generate private data from device tree
* @dev: corresponding k3 remote processor device
* @priv: pointer to driver specific private data
*
* Return: 0 if all goes good, else appropriate error message.
*/
static int k3_of_to_priv(struct udevice *dev,
struct k3_sysctrler_privdata *priv)
{
int ret;
ret = mbox_get_by_name(dev, "tx", &priv->chan_tx);
if (ret) {
dev_err(dev, "%s: Acquiring Tx channel failed. ret = %d\n",
__func__, ret);
return ret;
}
ret = mbox_get_by_name(dev, "rx", &priv->chan_rx);
if (ret) {
dev_err(dev, "%s: Acquiring Rx channel failed. ret = %d\n",
__func__, ret);
return ret;
}
/* Some SoCs may have a optional channel for boot notification. */
priv->has_boot_notify = 1;
ret = mbox_get_by_name(dev, "boot_notify", &priv->chan_boot_notify);
if (ret == -ENODATA) {
dev_dbg(dev, "%s: Acquiring optional Boot_notify failed. ret = %d. Using Rx\n",
__func__, ret);
priv->has_boot_notify = 0;
} else if (ret) {
dev_err(dev, "%s: Acquiring boot_notify channel failed. ret = %d\n",
__func__, ret);
return ret;
}
return 0;
}
/**
* k3_sysctrler_probe() - Basic probe
* @dev: corresponding k3 remote processor device
*
* Return: 0 if all goes good, else appropriate error message.
*/
static int k3_sysctrler_probe(struct udevice *dev)
{
struct k3_sysctrler_privdata *priv;
int ret;
debug("%s(dev=%p)\n", __func__, dev);
priv = dev_get_priv(dev);
ret = k3_of_to_priv(dev, priv);
if (ret) {
dev_err(dev, "%s: Probe failed with error %d\n", __func__, ret);
return ret;
}
priv->desc = (void *)dev_get_driver_data(dev);
priv->seq_nr = 0;
return 0;
}
static const struct k3_sysctrler_desc k3_sysctrler_am654_desc = {
.host_id = 4, /* HOST_ID_R5_1 */
.max_rx_timeout_us = 800000,
.max_msg_size = 60,
};
static const struct udevice_id k3_sysctrler_ids[] = {
{
.compatible = "ti,am654-system-controller",
.data = (ulong)&k3_sysctrler_am654_desc,
},
{}
};
U_BOOT_DRIVER(k3_sysctrler) = {
.name = "k3_system_controller",
.of_match = k3_sysctrler_ids,
.id = UCLASS_REMOTEPROC,
.ops = &k3_sysctrler_ops,
.probe = k3_sysctrler_probe,
.priv_auto = sizeof(struct k3_sysctrler_privdata),
};