123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438 |
- // 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,
- .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;
- }
- /*
- * 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,
- };
|