| // 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, |
| }; |