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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * (c) Copyright 2002-2010, Ralink Technology, Inc.
0004  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
0005  * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
0006  */
0007 
0008 #include <linux/kernel.h>
0009 #include <linux/firmware.h>
0010 #include <linux/delay.h>
0011 #include <linux/usb.h>
0012 #include <linux/skbuff.h>
0013 
0014 #include "mt7601u.h"
0015 #include "dma.h"
0016 #include "mcu.h"
0017 #include "usb.h"
0018 #include "trace.h"
0019 
0020 #define MCU_FW_URB_MAX_PAYLOAD      0x3800
0021 #define MCU_FW_URB_SIZE         (MCU_FW_URB_MAX_PAYLOAD + 12)
0022 #define MCU_RESP_URB_SIZE       1024
0023 
0024 static inline int firmware_running(struct mt7601u_dev *dev)
0025 {
0026     return mt7601u_rr(dev, MT_MCU_COM_REG0) == 1;
0027 }
0028 
0029 static inline void skb_put_le32(struct sk_buff *skb, u32 val)
0030 {
0031     put_unaligned_le32(val, skb_put(skb, 4));
0032 }
0033 
0034 static inline void mt7601u_dma_skb_wrap_cmd(struct sk_buff *skb,
0035                         u8 seq, enum mcu_cmd cmd)
0036 {
0037     WARN_ON(mt7601u_dma_skb_wrap(skb, CPU_TX_PORT, DMA_COMMAND,
0038                      FIELD_PREP(MT_TXD_CMD_INFO_SEQ, seq) |
0039                      FIELD_PREP(MT_TXD_CMD_INFO_TYPE, cmd)));
0040 }
0041 
0042 static inline void trace_mt_mcu_msg_send_cs(struct mt7601u_dev *dev,
0043                         struct sk_buff *skb, bool need_resp)
0044 {
0045     u32 i, csum = 0;
0046 
0047     for (i = 0; i < skb->len / 4; i++)
0048         csum ^= get_unaligned_le32(skb->data + i * 4);
0049 
0050     trace_mt_mcu_msg_send(dev, skb, csum, need_resp);
0051 }
0052 
0053 static struct sk_buff *mt7601u_mcu_msg_alloc(const void *data, int len)
0054 {
0055     struct sk_buff *skb;
0056 
0057     WARN_ON(len % 4); /* if length is not divisible by 4 we need to pad */
0058 
0059     skb = alloc_skb(len + MT_DMA_HDR_LEN + 4, GFP_KERNEL);
0060     if (skb) {
0061         skb_reserve(skb, MT_DMA_HDR_LEN);
0062         skb_put_data(skb, data, len);
0063     }
0064 
0065     return skb;
0066 }
0067 
0068 static int mt7601u_mcu_wait_resp(struct mt7601u_dev *dev, u8 seq)
0069 {
0070     struct urb *urb = dev->mcu.resp.urb;
0071     u32 rxfce;
0072     int urb_status, ret, i = 5;
0073 
0074     while (i--) {
0075         if (!wait_for_completion_timeout(&dev->mcu.resp_cmpl,
0076                          msecs_to_jiffies(300))) {
0077             dev_warn(dev->dev, "Warning: %s retrying\n", __func__);
0078             continue;
0079         }
0080 
0081         /* Make copies of important data before reusing the urb */
0082         rxfce = get_unaligned_le32(dev->mcu.resp.buf);
0083         urb_status = urb->status * mt7601u_urb_has_error(urb);
0084 
0085         ret = mt7601u_usb_submit_buf(dev, USB_DIR_IN, MT_EP_IN_CMD_RESP,
0086                          &dev->mcu.resp, GFP_KERNEL,
0087                          mt7601u_complete_urb,
0088                          &dev->mcu.resp_cmpl);
0089         if (ret)
0090             return ret;
0091 
0092         if (urb_status)
0093             dev_err(dev->dev, "Error: MCU resp urb failed:%d\n",
0094                 urb_status);
0095 
0096         if (FIELD_GET(MT_RXD_CMD_INFO_CMD_SEQ, rxfce) == seq &&
0097             FIELD_GET(MT_RXD_CMD_INFO_EVT_TYPE, rxfce) == CMD_DONE)
0098             return 0;
0099 
0100         dev_err(dev->dev, "Error: MCU resp evt:%lx seq:%hhx-%lx!\n",
0101             FIELD_GET(MT_RXD_CMD_INFO_EVT_TYPE, rxfce),
0102             seq, FIELD_GET(MT_RXD_CMD_INFO_CMD_SEQ, rxfce));
0103     }
0104 
0105     dev_err(dev->dev, "Error: %s timed out\n", __func__);
0106     return -ETIMEDOUT;
0107 }
0108 
0109 static int
0110 mt7601u_mcu_msg_send(struct mt7601u_dev *dev, struct sk_buff *skb,
0111              enum mcu_cmd cmd, bool wait_resp)
0112 {
0113     struct usb_device *usb_dev = mt7601u_to_usb_dev(dev);
0114     unsigned cmd_pipe = usb_sndbulkpipe(usb_dev,
0115                         dev->out_eps[MT_EP_OUT_INBAND_CMD]);
0116     int sent, ret;
0117     u8 seq = 0;
0118 
0119     if (test_bit(MT7601U_STATE_REMOVED, &dev->state)) {
0120         consume_skb(skb);
0121         return 0;
0122     }
0123 
0124     mutex_lock(&dev->mcu.mutex);
0125 
0126     if (wait_resp)
0127         while (!seq)
0128             seq = ++dev->mcu.msg_seq & 0xf;
0129 
0130     mt7601u_dma_skb_wrap_cmd(skb, seq, cmd);
0131 
0132     if (dev->mcu.resp_cmpl.done)
0133         dev_err(dev->dev, "Error: MCU response pre-completed!\n");
0134 
0135     trace_mt_mcu_msg_send_cs(dev, skb, wait_resp);
0136     trace_mt_submit_urb_sync(dev, cmd_pipe, skb->len);
0137     ret = usb_bulk_msg(usb_dev, cmd_pipe, skb->data, skb->len, &sent, 500);
0138     if (ret) {
0139         dev_err(dev->dev, "Error: send MCU cmd failed:%d\n", ret);
0140         goto out;
0141     }
0142     if (sent != skb->len)
0143         dev_err(dev->dev, "Error: %s sent != skb->len\n", __func__);
0144 
0145     if (wait_resp)
0146         ret = mt7601u_mcu_wait_resp(dev, seq);
0147 out:
0148     mutex_unlock(&dev->mcu.mutex);
0149 
0150     consume_skb(skb);
0151 
0152     return ret;
0153 }
0154 
0155 static int mt7601u_mcu_function_select(struct mt7601u_dev *dev,
0156                        enum mcu_function func, u32 val)
0157 {
0158     struct sk_buff *skb;
0159     struct {
0160         __le32 id;
0161         __le32 value;
0162     } __packed __aligned(4) msg = {
0163         .id = cpu_to_le32(func),
0164         .value = cpu_to_le32(val),
0165     };
0166 
0167     skb = mt7601u_mcu_msg_alloc(&msg, sizeof(msg));
0168     if (!skb)
0169         return -ENOMEM;
0170     return mt7601u_mcu_msg_send(dev, skb, CMD_FUN_SET_OP, func == 5);
0171 }
0172 
0173 int mt7601u_mcu_tssi_read_kick(struct mt7601u_dev *dev, int use_hvga)
0174 {
0175     int ret;
0176 
0177     if (!test_bit(MT7601U_STATE_MCU_RUNNING, &dev->state))
0178         return 0;
0179 
0180     ret = mt7601u_mcu_function_select(dev, ATOMIC_TSSI_SETTING,
0181                       use_hvga);
0182     if (ret) {
0183         dev_warn(dev->dev, "Warning: MCU TSSI read kick failed\n");
0184         return ret;
0185     }
0186 
0187     dev->tssi_read_trig = true;
0188 
0189     return 0;
0190 }
0191 
0192 int
0193 mt7601u_mcu_calibrate(struct mt7601u_dev *dev, enum mcu_calibrate cal, u32 val)
0194 {
0195     struct sk_buff *skb;
0196     struct {
0197         __le32 id;
0198         __le32 value;
0199     } __packed __aligned(4) msg = {
0200         .id = cpu_to_le32(cal),
0201         .value = cpu_to_le32(val),
0202     };
0203 
0204     skb = mt7601u_mcu_msg_alloc(&msg, sizeof(msg));
0205     if (!skb)
0206         return -ENOMEM;
0207     return mt7601u_mcu_msg_send(dev, skb, CMD_CALIBRATION_OP, true);
0208 }
0209 
0210 int mt7601u_write_reg_pairs(struct mt7601u_dev *dev, u32 base,
0211                 const struct mt76_reg_pair *data, int n)
0212 {
0213     const int max_vals_per_cmd = INBAND_PACKET_MAX_LEN / 8;
0214     struct sk_buff *skb;
0215     int cnt, i, ret;
0216 
0217     if (!n)
0218         return 0;
0219 
0220     cnt = min(max_vals_per_cmd, n);
0221 
0222     skb = alloc_skb(cnt * 8 + MT_DMA_HDR_LEN + 4, GFP_KERNEL);
0223     if (!skb)
0224         return -ENOMEM;
0225     skb_reserve(skb, MT_DMA_HDR_LEN);
0226 
0227     for (i = 0; i < cnt; i++) {
0228         skb_put_le32(skb, base + data[i].reg);
0229         skb_put_le32(skb, data[i].value);
0230     }
0231 
0232     ret = mt7601u_mcu_msg_send(dev, skb, CMD_RANDOM_WRITE, cnt == n);
0233     if (ret)
0234         return ret;
0235 
0236     return mt7601u_write_reg_pairs(dev, base, data + cnt, n - cnt);
0237 }
0238 
0239 int mt7601u_burst_write_regs(struct mt7601u_dev *dev, u32 offset,
0240                  const u32 *data, int n)
0241 {
0242     const int max_regs_per_cmd = INBAND_PACKET_MAX_LEN / 4 - 1;
0243     struct sk_buff *skb;
0244     int cnt, i, ret;
0245 
0246     if (!n)
0247         return 0;
0248 
0249     cnt = min(max_regs_per_cmd, n);
0250 
0251     skb = alloc_skb(cnt * 4 + MT_DMA_HDR_LEN + 4, GFP_KERNEL);
0252     if (!skb)
0253         return -ENOMEM;
0254     skb_reserve(skb, MT_DMA_HDR_LEN);
0255 
0256     skb_put_le32(skb, MT_MCU_MEMMAP_WLAN + offset);
0257     for (i = 0; i < cnt; i++)
0258         skb_put_le32(skb, data[i]);
0259 
0260     ret = mt7601u_mcu_msg_send(dev, skb, CMD_BURST_WRITE, cnt == n);
0261     if (ret)
0262         return ret;
0263 
0264     return mt7601u_burst_write_regs(dev, offset + cnt * 4,
0265                     data + cnt, n - cnt);
0266 }
0267 
0268 struct mt76_fw_header {
0269     __le32 ilm_len;
0270     __le32 dlm_len;
0271     __le16 build_ver;
0272     __le16 fw_ver;
0273     u8 pad[4];
0274     char build_time[16];
0275 };
0276 
0277 struct mt76_fw {
0278     struct mt76_fw_header hdr;
0279     u8 ivb[MT_MCU_IVB_SIZE];
0280     u8 ilm[];
0281 };
0282 
0283 static int __mt7601u_dma_fw(struct mt7601u_dev *dev,
0284                 const struct mt7601u_dma_buf *dma_buf,
0285                 const void *data, u32 len, u32 dst_addr)
0286 {
0287     DECLARE_COMPLETION_ONSTACK(cmpl);
0288     struct mt7601u_dma_buf buf = *dma_buf; /* we need to fake length */
0289     __le32 reg;
0290     u32 val;
0291     int ret;
0292 
0293     reg = cpu_to_le32(FIELD_PREP(MT_TXD_INFO_TYPE, DMA_PACKET) |
0294               FIELD_PREP(MT_TXD_INFO_D_PORT, CPU_TX_PORT) |
0295               FIELD_PREP(MT_TXD_INFO_LEN, len));
0296     memcpy(buf.buf, &reg, sizeof(reg));
0297     memcpy(buf.buf + sizeof(reg), data, len);
0298     memset(buf.buf + sizeof(reg) + len, 0, 8);
0299 
0300     ret = mt7601u_vendor_single_wr(dev, MT_VEND_WRITE_FCE,
0301                        MT_FCE_DMA_ADDR, dst_addr);
0302     if (ret)
0303         return ret;
0304     len = roundup(len, 4);
0305     ret = mt7601u_vendor_single_wr(dev, MT_VEND_WRITE_FCE,
0306                        MT_FCE_DMA_LEN, len << 16);
0307     if (ret)
0308         return ret;
0309 
0310     buf.len = MT_DMA_HDR_LEN + len + 4;
0311     ret = mt7601u_usb_submit_buf(dev, USB_DIR_OUT, MT_EP_OUT_INBAND_CMD,
0312                      &buf, GFP_KERNEL,
0313                      mt7601u_complete_urb, &cmpl);
0314     if (ret)
0315         return ret;
0316 
0317     if (!wait_for_completion_timeout(&cmpl, msecs_to_jiffies(1000))) {
0318         dev_err(dev->dev, "Error: firmware upload timed out\n");
0319         usb_kill_urb(buf.urb);
0320         return -ETIMEDOUT;
0321     }
0322     if (mt7601u_urb_has_error(buf.urb)) {
0323         dev_err(dev->dev, "Error: firmware upload urb failed:%d\n",
0324             buf.urb->status);
0325         return buf.urb->status;
0326     }
0327 
0328     val = mt7601u_rr(dev, MT_TX_CPU_FROM_FCE_CPU_DESC_IDX);
0329     val++;
0330     mt7601u_wr(dev, MT_TX_CPU_FROM_FCE_CPU_DESC_IDX, val);
0331 
0332     return 0;
0333 }
0334 
0335 static int
0336 mt7601u_dma_fw(struct mt7601u_dev *dev, struct mt7601u_dma_buf *dma_buf,
0337            const void *data, int len, u32 dst_addr)
0338 {
0339     int n, ret;
0340 
0341     if (len == 0)
0342         return 0;
0343 
0344     n = min(MCU_FW_URB_MAX_PAYLOAD, len);
0345     ret = __mt7601u_dma_fw(dev, dma_buf, data, n, dst_addr);
0346     if (ret)
0347         return ret;
0348 
0349     if (!mt76_poll_msec(dev, MT_MCU_COM_REG1, BIT(31), BIT(31), 500))
0350         return -ETIMEDOUT;
0351 
0352     return mt7601u_dma_fw(dev, dma_buf, data + n, len - n, dst_addr + n);
0353 }
0354 
0355 static int
0356 mt7601u_upload_firmware(struct mt7601u_dev *dev, const struct mt76_fw *fw)
0357 {
0358     struct mt7601u_dma_buf dma_buf;
0359     void *ivb;
0360     u32 ilm_len, dlm_len;
0361     int i, ret;
0362 
0363     ivb = kmemdup(fw->ivb, sizeof(fw->ivb), GFP_KERNEL);
0364     if (!ivb)
0365         return -ENOMEM;
0366     if (mt7601u_usb_alloc_buf(dev, MCU_FW_URB_SIZE, &dma_buf)) {
0367         ret = -ENOMEM;
0368         goto error;
0369     }
0370 
0371     ilm_len = le32_to_cpu(fw->hdr.ilm_len) - sizeof(fw->ivb);
0372     dev_dbg(dev->dev, "loading FW - ILM %u + IVB %zu\n",
0373         ilm_len, sizeof(fw->ivb));
0374     ret = mt7601u_dma_fw(dev, &dma_buf, fw->ilm, ilm_len, sizeof(fw->ivb));
0375     if (ret)
0376         goto error;
0377 
0378     dlm_len = le32_to_cpu(fw->hdr.dlm_len);
0379     dev_dbg(dev->dev, "loading FW - DLM %u\n", dlm_len);
0380     ret = mt7601u_dma_fw(dev, &dma_buf, fw->ilm + ilm_len,
0381                  dlm_len, MT_MCU_DLM_OFFSET);
0382     if (ret)
0383         goto error;
0384 
0385     ret = mt7601u_vendor_request(dev, MT_VEND_DEV_MODE, USB_DIR_OUT,
0386                      0x12, 0, ivb, sizeof(fw->ivb));
0387     if (ret < 0)
0388         goto error;
0389     ret = 0;
0390 
0391     for (i = 100; i && !firmware_running(dev); i--)
0392         msleep(10);
0393     if (!i) {
0394         ret = -ETIMEDOUT;
0395         goto error;
0396     }
0397 
0398     dev_dbg(dev->dev, "Firmware running!\n");
0399 error:
0400     kfree(ivb);
0401     mt7601u_usb_free_buf(dev, &dma_buf);
0402 
0403     return ret;
0404 }
0405 
0406 static int mt7601u_load_firmware(struct mt7601u_dev *dev)
0407 {
0408     const struct firmware *fw;
0409     const struct mt76_fw_header *hdr;
0410     int len, ret;
0411     u32 val;
0412 
0413     mt7601u_wr(dev, MT_USB_DMA_CFG, (MT_USB_DMA_CFG_RX_BULK_EN |
0414                      MT_USB_DMA_CFG_TX_BULK_EN));
0415 
0416     if (firmware_running(dev))
0417         return firmware_request_cache(dev->dev, MT7601U_FIRMWARE);
0418 
0419     ret = request_firmware(&fw, MT7601U_FIRMWARE, dev->dev);
0420     if (ret)
0421         return ret;
0422 
0423     if (!fw || !fw->data || fw->size < sizeof(*hdr))
0424         goto err_inv_fw;
0425 
0426     hdr = (const struct mt76_fw_header *) fw->data;
0427 
0428     if (le32_to_cpu(hdr->ilm_len) <= MT_MCU_IVB_SIZE)
0429         goto err_inv_fw;
0430 
0431     len = sizeof(*hdr);
0432     len += le32_to_cpu(hdr->ilm_len);
0433     len += le32_to_cpu(hdr->dlm_len);
0434 
0435     if (fw->size != len)
0436         goto err_inv_fw;
0437 
0438     val = le16_to_cpu(hdr->fw_ver);
0439     dev_info(dev->dev,
0440          "Firmware Version: %d.%d.%02d Build: %x Build time: %.16s\n",
0441          (val >> 12) & 0xf, (val >> 8) & 0xf, val & 0xf,
0442          le16_to_cpu(hdr->build_ver), hdr->build_time);
0443 
0444     len = le32_to_cpu(hdr->ilm_len);
0445 
0446     mt7601u_wr(dev, 0x94c, 0);
0447     mt7601u_wr(dev, MT_FCE_PSE_CTRL, 0);
0448 
0449     mt7601u_vendor_reset(dev);
0450     msleep(5);
0451 
0452     mt7601u_wr(dev, 0xa44, 0);
0453     mt7601u_wr(dev, 0x230, 0x84210);
0454     mt7601u_wr(dev, 0x400, 0x80c00);
0455     mt7601u_wr(dev, 0x800, 1);
0456 
0457     mt7601u_rmw(dev, MT_PBF_CFG, 0, (MT_PBF_CFG_TX0Q_EN |
0458                      MT_PBF_CFG_TX1Q_EN |
0459                      MT_PBF_CFG_TX2Q_EN |
0460                      MT_PBF_CFG_TX3Q_EN));
0461 
0462     mt7601u_wr(dev, MT_FCE_PSE_CTRL, 1);
0463 
0464     mt7601u_wr(dev, MT_USB_DMA_CFG, (MT_USB_DMA_CFG_RX_BULK_EN |
0465                      MT_USB_DMA_CFG_TX_BULK_EN));
0466     val = mt76_set(dev, MT_USB_DMA_CFG, MT_USB_DMA_CFG_TX_CLR);
0467     val &= ~MT_USB_DMA_CFG_TX_CLR;
0468     mt7601u_wr(dev, MT_USB_DMA_CFG, val);
0469 
0470     /* FCE tx_fs_base_ptr */
0471     mt7601u_wr(dev, MT_TX_CPU_FROM_FCE_BASE_PTR, 0x400230);
0472     /* FCE tx_fs_max_cnt */
0473     mt7601u_wr(dev, MT_TX_CPU_FROM_FCE_MAX_COUNT, 1);
0474     /* FCE pdma enable */
0475     mt7601u_wr(dev, MT_FCE_PDMA_GLOBAL_CONF, 0x44);
0476     /* FCE skip_fs_en */
0477     mt7601u_wr(dev, MT_FCE_SKIP_FS, 3);
0478 
0479     ret = mt7601u_upload_firmware(dev, (const struct mt76_fw *)fw->data);
0480 
0481     release_firmware(fw);
0482 
0483     return ret;
0484 
0485 err_inv_fw:
0486     dev_err(dev->dev, "Invalid firmware image\n");
0487     release_firmware(fw);
0488     return -ENOENT;
0489 }
0490 
0491 int mt7601u_mcu_init(struct mt7601u_dev *dev)
0492 {
0493     int ret;
0494 
0495     mutex_init(&dev->mcu.mutex);
0496 
0497     ret = mt7601u_load_firmware(dev);
0498     if (ret)
0499         return ret;
0500 
0501     set_bit(MT7601U_STATE_MCU_RUNNING, &dev->state);
0502 
0503     return 0;
0504 }
0505 
0506 int mt7601u_mcu_cmd_init(struct mt7601u_dev *dev)
0507 {
0508     int ret;
0509 
0510     ret = mt7601u_mcu_function_select(dev, Q_SELECT, 1);
0511     if (ret)
0512         return ret;
0513 
0514     init_completion(&dev->mcu.resp_cmpl);
0515     if (mt7601u_usb_alloc_buf(dev, MCU_RESP_URB_SIZE, &dev->mcu.resp)) {
0516         mt7601u_usb_free_buf(dev, &dev->mcu.resp);
0517         return -ENOMEM;
0518     }
0519 
0520     ret = mt7601u_usb_submit_buf(dev, USB_DIR_IN, MT_EP_IN_CMD_RESP,
0521                      &dev->mcu.resp, GFP_KERNEL,
0522                      mt7601u_complete_urb, &dev->mcu.resp_cmpl);
0523     if (ret) {
0524         mt7601u_usb_free_buf(dev, &dev->mcu.resp);
0525         return ret;
0526     }
0527 
0528     return 0;
0529 }
0530 
0531 void mt7601u_mcu_cmd_deinit(struct mt7601u_dev *dev)
0532 {
0533     usb_kill_urb(dev->mcu.resp.urb);
0534     mt7601u_usb_free_buf(dev, &dev->mcu.resp);
0535 }
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