--- /dev/null
+// 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 <asm/io.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);
+}
+
+static inline void sp_writel(void __iomem *addr, unsigned int offset, u32 data)
+{
+ writel(data, 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("Invaild 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(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) {
+ printf("%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++;
+ }
+
+ /*
+ * '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
+ */
+ if (data_reg <= (spt->data + spm->desc->data_end_offset))
+ sp_writel(spt->data, spm->desc->data_end_offset, 0);
+
+ 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,
+ .free = 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;
+}
+
+/*
+ * Thread ID #4: ROM request
+ * Thread ID #5: ROM response, SYSFW notify
+ * Thread ID #6: SYSFW request response
+ * Thread ID #7: SYSFW request high priority
+ * Thread ID #8: SYSFW request low priority
+ * Thread ID #9: SYSFW notify response
+ */
+static const u32 am6x_valid_threads[] = { 4, 5, 6, 7, 8, 9, 11, 13 };
+
+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_alloc_size = sizeof(struct k3_sec_proxy_mbox),
+ .ops = &k3_sec_proxy_mbox_ops,
+};
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