u-boot/drivers/mailbox/k3-sec-proxy.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Texas Instruments' K3 Secure proxy Driver
*
* Copyright (C) 2017-2018 Texas Instruments Incorporated - http://www.ti.com/
* Lokesh Vutla <lokeshvutla@ti.com>
*/
#include <common.h>
#include <log.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <dm/device_compat.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/soc/ti/k3-sec-proxy.h>
#include <dm.h>
#include <mailbox-uclass.h>
DECLARE_GLOBAL_DATA_PTR;
/* SEC PROXY RT THREAD STATUS */
#define RT_THREAD_STATUS 0x0
#define RT_THREAD_THRESHOLD 0x4
#define RT_THREAD_STATUS_ERROR_SHIFT 31
#define RT_THREAD_STATUS_ERROR_MASK BIT(31)
#define RT_THREAD_STATUS_CUR_CNT_SHIFT 0
#define RT_THREAD_STATUS_CUR_CNT_MASK GENMASK(7, 0)
/* SEC PROXY SCFG THREAD CTRL */
#define SCFG_THREAD_CTRL 0x1000
#define SCFG_THREAD_CTRL_DIR_SHIFT 31
#define SCFG_THREAD_CTRL_DIR_MASK BIT(31)
#define SEC_PROXY_THREAD(base, x) ((base) + (0x1000 * (x)))
#define THREAD_IS_RX 1
#define THREAD_IS_TX 0
/**
* struct k3_sec_proxy_desc - Description of secure proxy integration.
* @thread_count: Number of Threads.
* @max_msg_size: Message size in bytes.
* @data_start_offset: Offset of the First data register of the thread
* @data_end_offset: Offset of the Last data register of the thread
* @valid_threads: List of Valid threads that the processor can access
* @num_valid_threads: Number of valid threads.
*/
struct k3_sec_proxy_desc {
u16 thread_count;
u16 max_msg_size;
u16 data_start_offset;
u16 data_end_offset;
const u32 *valid_threads;
u32 num_valid_threads;
};
/**
* struct k3_sec_proxy_thread - Description of a secure proxy Thread
* @id: Thread ID
* @data: Thread Data path region for target
* @scfg: Secure Config Region for Thread
* @rt: RealTime Region for Thread
* @rx_buf: Receive buffer data, max message size.
*/
struct k3_sec_proxy_thread {
u32 id;
void __iomem *data;
void __iomem *scfg;
void __iomem *rt;
u32 *rx_buf;
};
/**
* struct k3_sec_proxy_mbox - Description of a Secure Proxy Instance
* @chan: Mailbox Channel
* @desc: Description of the SoC integration
* @chans: Array for valid thread instances
* @target_data: Secure Proxy region for Target Data
* @scfg: Secure Proxy Region for Secure configuration.
* @rt: Secure proxy Region for Real Time Region.
*/
struct k3_sec_proxy_mbox {
struct mbox_chan chan;
struct k3_sec_proxy_desc *desc;
struct k3_sec_proxy_thread *chans;
phys_addr_t target_data;
phys_addr_t scfg;
phys_addr_t rt;
};
static inline u32 sp_readl(void __iomem *addr, unsigned int offset)
{
return readl(addr + offset);
}
/**
* k3_sec_proxy_of_xlate() - Translation of phandle to channel
* @chan: Mailbox channel
* @args: Phandle Pointer
*
* Translates the phandle args and fills up the Mailbox channel from client.
* Return: 0 if all goes good, else return corresponding error message.
*/
static int k3_sec_proxy_of_xlate(struct mbox_chan *chan,
struct ofnode_phandle_args *args)
{
struct k3_sec_proxy_mbox *spm = dev_get_priv(chan->dev);
int ind, i;
debug("%s(chan=%p)\n", __func__, chan);
if (args->args_count != 1) {
debug("Invalid args_count: %d\n", args->args_count);
return -EINVAL;
}
ind = args->args[0];
for (i = 0; i < spm->desc->num_valid_threads; i++)
if (spm->chans[i].id == ind) {
chan->id = ind;
chan->con_priv = &spm->chans[i];
return 0;
}
dev_err(chan->dev, "%s: Invalid Thread ID %d\n", __func__, ind);
return -ENOENT;
}
/**
* k3_sec_proxy_request() - Request for mailbox channel
* @chan: Channel Pointer
*/
static int k3_sec_proxy_request(struct mbox_chan *chan)
{
debug("%s(chan=%p)\n", __func__, chan);
return 0;
}
/**
* k3_sec_proxy_free() - Free the mailbox channel
* @chan: Channel Pointer
*/
static int k3_sec_proxy_free(struct mbox_chan *chan)
{
debug("%s(chan=%p)\n", __func__, chan);
return 0;
}
/**
* k3_sec_proxy_verify_thread() - Verify thread status before
* sending/receiving data.
* @spt: pointer to secure proxy thread description
* @dir: Direction of the thread
*
* Return: 0 if all goes good, else appropriate error message.
*/
static inline int k3_sec_proxy_verify_thread(struct k3_sec_proxy_thread *spt,
u8 dir)
{
/* Check for any errors already available */
if (sp_readl(spt->rt, RT_THREAD_STATUS) &
RT_THREAD_STATUS_ERROR_MASK) {
printf("%s: Thread %d is corrupted, cannot send data.\n",
__func__, spt->id);
return -EINVAL;
}
/* Make sure thread is configured for right direction */
if ((sp_readl(spt->scfg, SCFG_THREAD_CTRL)
& SCFG_THREAD_CTRL_DIR_MASK) >> SCFG_THREAD_CTRL_DIR_SHIFT != dir) {
if (dir)
printf("%s: Trying to receive data on tx Thread %d\n",
__func__, spt->id);
else
printf("%s: Trying to send data on rx Thread %d\n",
__func__, spt->id);
return -EINVAL;
}
/* Check the message queue before sending/receiving data */
if (!(sp_readl(spt->rt, RT_THREAD_STATUS) &
RT_THREAD_STATUS_CUR_CNT_MASK))
return -ENODATA;
return 0;
}
/**
* k3_sec_proxy_send() - Send data via mailbox channel
* @chan: Channel Pointer
* @data: Pointer to k3_sec_proxy_msg
*
* Return: 0 if all goes good, else appropriate error message.
*/
static int k3_sec_proxy_send(struct mbox_chan *chan, const void *data)
{
const struct k3_sec_proxy_msg *msg = (struct k3_sec_proxy_msg *)data;
struct k3_sec_proxy_mbox *spm = dev_get_priv(chan->dev);
struct k3_sec_proxy_thread *spt = chan->con_priv;
int num_words, trail_bytes, ret;
void __iomem *data_reg;
u32 *word_data;
debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
ret = k3_sec_proxy_verify_thread(spt, THREAD_IS_TX);
if (ret) {
dev_err(chan->dev,
"%s: Thread%d verification failed. ret = %d\n",
__func__, spt->id, ret);
return ret;
}
/* Check the message size. */
if (msg->len > spm->desc->max_msg_size) {
dev_err(chan->dev,
"%s: Thread %ld message length %zu > max msg size %d\n",
__func__, chan->id, msg->len, spm->desc->max_msg_size);
return -EINVAL;
}
/* Send the message */
data_reg = spt->data + spm->desc->data_start_offset;
for (num_words = msg->len / sizeof(u32), word_data = (u32 *)msg->buf;
num_words;
num_words--, data_reg += sizeof(u32), word_data++)
writel(*word_data, data_reg);
trail_bytes = msg->len % sizeof(u32);
if (trail_bytes) {
u32 data_trail = *word_data;
/* Ensure all unused data is 0 */
data_trail &= 0xFFFFFFFF >> (8 * (sizeof(u32) - trail_bytes));
writel(data_trail, data_reg);
data_reg += sizeof(u32);
}
/*
* 'data_reg' indicates next register to write. If we did not already
* write on tx complete reg(last reg), we must do so for transmit
* In addition, we also need to make sure all intermediate data
* registers(if any required), are reset to 0 for TISCI backward
* compatibility to be maintained.
*/
while (data_reg <= (spt->data + spm->desc->data_end_offset)) {
writel(0x0, data_reg);
data_reg += sizeof(u32);
}
debug("%s: Message successfully sent on thread %ld\n",
__func__, chan->id);
return 0;
}
/**
* k3_sec_proxy_recv() - Receive data via mailbox channel
* @chan: Channel Pointer
* @data: Pointer to k3_sec_proxy_msg
*
* Return: 0 if all goes good, else appropriate error message.
*/
static int k3_sec_proxy_recv(struct mbox_chan *chan, void *data)
{
struct k3_sec_proxy_mbox *spm = dev_get_priv(chan->dev);
struct k3_sec_proxy_thread *spt = chan->con_priv;
struct k3_sec_proxy_msg *msg = data;
void __iomem *data_reg;
int num_words, ret;
u32 *word_data;
debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
ret = k3_sec_proxy_verify_thread(spt, THREAD_IS_RX);
if (ret)
return ret;
msg->len = spm->desc->max_msg_size;
msg->buf = spt->rx_buf;
data_reg = spt->data + spm->desc->data_start_offset;
word_data = spt->rx_buf;
for (num_words = spm->desc->max_msg_size / sizeof(u32);
num_words;
num_words--, data_reg += sizeof(u32), word_data++)
*word_data = readl(data_reg);
debug("%s: Message successfully received from thread %ld\n",
__func__, chan->id);
return 0;
}
struct mbox_ops k3_sec_proxy_mbox_ops = {
.of_xlate = k3_sec_proxy_of_xlate,
.request = k3_sec_proxy_request,
.rfree = k3_sec_proxy_free,
.send = k3_sec_proxy_send,
.recv = k3_sec_proxy_recv,
};
/**
* k3_sec_proxy_of_to_priv() - generate private data from device tree
* @dev: corresponding k3 secure proxy device
* @spm: pointer to driver specific private data
*
* Return: 0 if all went ok, else corresponding error message.
*/
static int k3_sec_proxy_of_to_priv(struct udevice *dev,
struct k3_sec_proxy_mbox *spm)
{
const void *blob = gd->fdt_blob;
if (!blob) {
debug("'%s' no dt?\n", dev->name);
return -ENODEV;
}
spm->target_data = devfdt_get_addr_name(dev, "target_data");
if (spm->target_data == FDT_ADDR_T_NONE) {
dev_err(dev, "No reg property for target data base\n");
return -EINVAL;
}
spm->scfg = devfdt_get_addr_name(dev, "scfg");
if (spm->rt == FDT_ADDR_T_NONE) {
dev_err(dev, "No reg property for Secure Cfg base\n");
return -EINVAL;
}
spm->rt = devfdt_get_addr_name(dev, "rt");
if (spm->rt == FDT_ADDR_T_NONE) {
dev_err(dev, "No reg property for Real Time Cfg base\n");
return -EINVAL;
}
return 0;
}
/**
* k3_sec_proxy_thread_setup - Initialize the parameters for all valid threads
* @spm: Mailbox instance for which threads needs to be initialized
*
* Return: 0 if all went ok, else corresponding error message
*/
static int k3_sec_proxy_thread_setup(struct k3_sec_proxy_mbox *spm)
{
struct k3_sec_proxy_thread *spt;
int i, ind;
for (i = 0; i < spm->desc->num_valid_threads; i++) {
spt = &spm->chans[i];
ind = spm->desc->valid_threads[i];
spt->id = ind;
spt->data = (void *)SEC_PROXY_THREAD(spm->target_data, ind);
spt->scfg = (void *)SEC_PROXY_THREAD(spm->scfg, ind);
spt->rt = (void *)SEC_PROXY_THREAD(spm->rt, ind);
spt->rx_buf = calloc(1, spm->desc->max_msg_size);
if (!spt->rx_buf)
return -ENOMEM;
}
return 0;
}
/**
* k3_sec_proxy_probe() - Basic probe
* @dev: corresponding mailbox device
*
* Return: 0 if all went ok, else corresponding error message
*/
static int k3_sec_proxy_probe(struct udevice *dev)
{
struct k3_sec_proxy_mbox *spm = dev_get_priv(dev);
int ret;
debug("%s(dev=%p)\n", __func__, dev);
ret = k3_sec_proxy_of_to_priv(dev, spm);
if (ret)
return ret;
spm->desc = (void *)dev_get_driver_data(dev);
spm->chans = calloc(spm->desc->num_valid_threads,
sizeof(struct k3_sec_proxy_thread));
if (!spm->chans)
return -ENOMEM;
ret = k3_sec_proxy_thread_setup(spm);
if (ret) {
debug("%s: secure proxy thread setup failed\n", __func__);
return ret;
}
return 0;
}
static int k3_sec_proxy_remove(struct udevice *dev)
{
struct k3_sec_proxy_mbox *spm = dev_get_priv(dev);
debug("%s(dev=%p)\n", __func__, dev);
free(spm->chans);
return 0;
}
static const u32 am6x_valid_threads[] = { 0, 1, 4, 5, 6, 7, 8, 9, 11, 12, 13, 20, 21, 22, 23 };
static const struct k3_sec_proxy_desc am654_desc = {
.thread_count = 90,
.max_msg_size = 60,
.data_start_offset = 0x4,
.data_end_offset = 0x3C,
.valid_threads = am6x_valid_threads,
.num_valid_threads = ARRAY_SIZE(am6x_valid_threads),
};
static const struct udevice_id k3_sec_proxy_ids[] = {
{ .compatible = "ti,am654-secure-proxy", .data = (ulong)&am654_desc},
{ }
};
U_BOOT_DRIVER(k3_sec_proxy) = {
.name = "k3-secure-proxy",
.id = UCLASS_MAILBOX,
.of_match = k3_sec_proxy_ids,
.probe = k3_sec_proxy_probe,
.remove = k3_sec_proxy_remove,
.priv_auto = sizeof(struct k3_sec_proxy_mbox),
.ops = &k3_sec_proxy_mbox_ops,
};