drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c

   1 // SPDX-License-Identifier: ISC
   2 /*
   3  * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/firmware.h>
   8
   9 #include "mt76x02.h"
  10 #include "mt76x02_mcu.h"
  11 #include "mt76x02_usb.h"
  12
  13 #define MT_CMD_HDR_LEN                  4
  14
  15 #define MT_FCE_DMA_ADDR                 0x0230
  16 #define MT_FCE_DMA_LEN                  0x0234
  17
  18 #define MT_TX_CPU_FROM_FCE_CPU_DESC_IDX 0x09a8
  19
  20 static void
  21 mt76x02u_multiple_mcu_reads(struct mt76_dev *dev, u8 *data, int len)
  22 {
  23         struct mt76_usb *usb = &dev->usb;
  24         int i;
  25
  26         WARN_ON_ONCE(len / 8 != usb->mcu.rp_len);
  27
  28         for (i = 0; i < usb->mcu.rp_len; i++) {
  29                 u32 reg = get_unaligned_le32(data + 8 * i) - usb->mcu.base;
  30                 u32 val = get_unaligned_le32(data + 8 * i + 4);
  31
  32                 WARN_ON_ONCE(usb->mcu.rp[i].reg != reg);
  33                 usb->mcu.rp[i].value = val;
  34         }
  35 }
  36
  37 static int mt76x02u_mcu_wait_resp(struct mt76_dev *dev, u8 seq)
  38 {
  39         struct mt76_usb *usb = &dev->usb;
  40         u8 *data = usb->mcu.data;
  41         int i, len, ret;
  42         u32 rxfce;
  43
  44         for (i = 0; i < 5; i++) {
  45                 ret = mt76u_bulk_msg(dev, data, MCU_RESP_URB_SIZE, &len,
  46                                      300, MT_EP_IN_CMD_RESP);
  47                 if (ret == -ETIMEDOUT)
  48                         continue;
  49                 if (ret)
  50                         goto out;
  51
  52                 if (usb->mcu.rp)
  53                         mt76x02u_multiple_mcu_reads(dev, data + 4, len - 8);
  54
  55                 rxfce = get_unaligned_le32(data);
  56                 if (seq == FIELD_GET(MT_RX_FCE_INFO_CMD_SEQ, rxfce) &&
  57                     FIELD_GET(MT_RX_FCE_INFO_EVT_TYPE, rxfce) == EVT_CMD_DONE)
  58                         return 0;
  59
  60                 dev_err(dev->dev, "error: MCU resp evt:%lx seq:%hhx-%lx\n",
  61                         FIELD_GET(MT_RX_FCE_INFO_EVT_TYPE, rxfce),
  62                         seq, FIELD_GET(MT_RX_FCE_INFO_CMD_SEQ, rxfce));
  63         }
  64 out:
  65         dev_err(dev->dev, "error: %s failed with %d\n", __func__, ret);
  66         return ret;
  67 }
  68
  69 static int
  70 __mt76x02u_mcu_send_msg(struct mt76_dev *dev, struct sk_buff *skb,
  71                         int cmd, bool wait_resp)
  72 {
  73         u8 seq = 0;
  74         u32 info;
  75         int ret;
  76
  77         if (test_bit(MT76_REMOVED, &dev->phy.state)) {
  78                 ret = 0;
  79                 goto out;
  80         }
  81
  82         if (wait_resp) {
  83                 seq = ++dev->mcu.msg_seq & 0xf;
  84                 if (!seq)
  85                         seq = ++dev->mcu.msg_seq & 0xf;
  86         }
  87
  88         info = FIELD_PREP(MT_MCU_MSG_CMD_SEQ, seq) |
  89                FIELD_PREP(MT_MCU_MSG_CMD_TYPE, cmd) |
  90                MT_MCU_MSG_TYPE_CMD;
  91         ret = mt76x02u_skb_dma_info(skb, CPU_TX_PORT, info);
  92         if (ret)
  93                 return ret;
  94
  95         ret = mt76u_bulk_msg(dev, skb->data, skb->len, NULL, 500,
  96                              MT_EP_OUT_INBAND_CMD);
  97         if (ret)
  98                 goto out;
  99
 100         if (wait_resp)
 101                 ret = mt76x02u_mcu_wait_resp(dev, seq);
 102
 103 out:
 104         consume_skb(skb);
 105
 106         return ret;
 107 }
 108
 109 static int
 110 mt76x02u_mcu_send_msg(struct mt76_dev *dev, int cmd, const void *data,
 111                       int len, bool wait_resp)
 112 {
 113         struct sk_buff *skb;
 114         int err;
 115
 116         skb = mt76_mcu_msg_alloc(dev, data, len);
 117         if (!skb)
 118                 return -ENOMEM;
 119
 120         mutex_lock(&dev->mcu.mutex);
 121         err = __mt76x02u_mcu_send_msg(dev, skb, cmd, wait_resp);
 122         mutex_unlock(&dev->mcu.mutex);
 123
 124         return err;
 125 }
 126
 127 static inline void skb_put_le32(struct sk_buff *skb, u32 val)
 128 {
 129         put_unaligned_le32(val, skb_put(skb, 4));
 130 }
 131
 132 static int
 133 mt76x02u_mcu_wr_rp(struct mt76_dev *dev, u32 base,
 134                    const struct mt76_reg_pair *data, int n)
 135 {
 136         const int max_vals_per_cmd = MT_INBAND_PACKET_MAX_LEN / 8;
 137         const int CMD_RANDOM_WRITE = 12;
 138         struct sk_buff *skb;
 139         int cnt, i, ret;
 140
 141         if (!n)
 142                 return 0;
 143
 144         cnt = min(max_vals_per_cmd, n);
 145
 146         skb = alloc_skb(cnt * 8 + MT_DMA_HDR_LEN + 4, GFP_KERNEL);
 147         if (!skb)
 148                 return -ENOMEM;
 149         skb_reserve(skb, MT_DMA_HDR_LEN);
 150
 151         for (i = 0; i < cnt; i++) {
 152                 skb_put_le32(skb, base + data[i].reg);
 153                 skb_put_le32(skb, data[i].value);
 154         }
 155
 156         mutex_lock(&dev->mcu.mutex);
 157         ret = __mt76x02u_mcu_send_msg(dev, skb, CMD_RANDOM_WRITE, cnt == n);
 158         mutex_unlock(&dev->mcu.mutex);
 159         if (ret)
 160                 return ret;
 161
 162         return mt76x02u_mcu_wr_rp(dev, base, data + cnt, n - cnt);
 163 }
 164
 165 static int
 166 mt76x02u_mcu_rd_rp(struct mt76_dev *dev, u32 base,
 167                    struct mt76_reg_pair *data, int n)
 168 {
 169         const int CMD_RANDOM_READ = 10;
 170         const int max_vals_per_cmd = MT_INBAND_PACKET_MAX_LEN / 8;
 171         struct mt76_usb *usb = &dev->usb;
 172         struct sk_buff *skb;
 173         int cnt, i, ret;
 174
 175         if (!n)
 176                 return 0;
 177
 178         cnt = min(max_vals_per_cmd, n);
 179         if (cnt != n)
 180                 return -EINVAL;
 181
 182         skb = alloc_skb(cnt * 8 + MT_DMA_HDR_LEN + 4, GFP_KERNEL);
 183         if (!skb)
 184                 return -ENOMEM;
 185         skb_reserve(skb, MT_DMA_HDR_LEN);
 186
 187         for (i = 0; i < cnt; i++) {
 188                 skb_put_le32(skb, base + data[i].reg);
 189                 skb_put_le32(skb, data[i].value);
 190         }
 191
 192         mutex_lock(&dev->mcu.mutex);
 193
 194         usb->mcu.rp = data;
 195         usb->mcu.rp_len = n;
 196         usb->mcu.base = base;
 197
 198         ret = __mt76x02u_mcu_send_msg(dev, skb, CMD_RANDOM_READ, true);
 199
 200         usb->mcu.rp = NULL;
 201
 202         mutex_unlock(&dev->mcu.mutex);
 203
 204         return ret;
 205 }
 206
 207 void mt76x02u_mcu_fw_reset(struct mt76x02_dev *dev)
 208 {
 209         mt76u_vendor_request(&dev->mt76, MT_VEND_DEV_MODE,
 210                              USB_DIR_OUT | USB_TYPE_VENDOR,
 211                              0x1, 0, NULL, 0);
 212 }
 213 EXPORT_SYMBOL_GPL(mt76x02u_mcu_fw_reset);
 214
 215 static int
 216 __mt76x02u_mcu_fw_send_data(struct mt76x02_dev *dev, u8 *data,
 217                             const void *fw_data, int len, u32 dst_addr)
 218 {
 219         __le32 info;
 220         u32 val;
 221         int err, data_len;
 222
 223         info = cpu_to_le32(FIELD_PREP(MT_MCU_MSG_PORT, CPU_TX_PORT) |
 224                            FIELD_PREP(MT_MCU_MSG_LEN, len) |
 225                            MT_MCU_MSG_TYPE_CMD);
 226
 227         memcpy(data, &info, sizeof(info));
 228         memcpy(data + sizeof(info), fw_data, len);
 229         memset(data + sizeof(info) + len, 0, 4);
 230
 231         mt76u_single_wr(&dev->mt76, MT_VEND_WRITE_FCE,
 232                         MT_FCE_DMA_ADDR, dst_addr);
 233         len = roundup(len, 4);
 234         mt76u_single_wr(&dev->mt76, MT_VEND_WRITE_FCE,
 235                         MT_FCE_DMA_LEN, len << 16);
 236
 237         data_len = MT_CMD_HDR_LEN + len + sizeof(info);
 238
 239         err = mt76u_bulk_msg(&dev->mt76, data, data_len, NULL, 1000,
 240                              MT_EP_OUT_INBAND_CMD);
 241         if (err) {
 242                 dev_err(dev->mt76.dev, "firmware upload failed: %d\n", err);
 243                 return err;
 244         }
 245
 246         val = mt76_rr(dev, MT_TX_CPU_FROM_FCE_CPU_DESC_IDX);
 247         val++;
 248         mt76_wr(dev, MT_TX_CPU_FROM_FCE_CPU_DESC_IDX, val);
 249
 250         return 0;
 251 }
 252
 253 int mt76x02u_mcu_fw_send_data(struct mt76x02_dev *dev, const void *data,
 254                               int data_len, u32 max_payload, u32 offset)
 255 {
 256         int len, err = 0, pos = 0, max_len = max_payload - 8;
 257         u8 *buf;
 258
 259         buf = kmalloc(max_payload, GFP_KERNEL);
 260         if (!buf)
 261                 return -ENOMEM;
 262
 263         while (data_len > 0) {
 264                 len = min_t(int, data_len, max_len);
 265                 err = __mt76x02u_mcu_fw_send_data(dev, buf, data + pos,
 266                                                   len, offset + pos);
 267                 if (err < 0)
 268                         break;
 269
 270                 data_len -= len;
 271                 pos += len;
 272                 usleep_range(5000, 10000);
 273         }
 274         kfree(buf);
 275
 276         return err;
 277 }
 278 EXPORT_SYMBOL_GPL(mt76x02u_mcu_fw_send_data);
 279
 280 void mt76x02u_init_mcu(struct mt76_dev *dev)
 281 {
 282         static const struct mt76_mcu_ops mt76x02u_mcu_ops = {
 283                 .headroom = MT_CMD_HDR_LEN,
 284                 .tailroom = 8,
 285                 .mcu_send_msg = mt76x02u_mcu_send_msg,
 286                 .mcu_parse_response = mt76x02_mcu_parse_response,
 287                 .mcu_wr_rp = mt76x02u_mcu_wr_rp,
 288                 .mcu_rd_rp = mt76x02u_mcu_rd_rp,
 289         };
 290
 291         dev->mcu_ops = &mt76x02u_mcu_ops;
 292 }
 293 EXPORT_SYMBOL_GPL(mt76x02u_init_mcu);
 294
 295 MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
 296 MODULE_DESCRIPTION("MediaTek MT76x02 MCU helpers");
 297 MODULE_LICENSE("Dual BSD/GPL");