tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 71bbca0322aee9dfe26f2a23ab54f5cfca1dd85c commit: 07a6747f952bd8a1ee87d6f5d74448c64fbb152e [2753/2753] i2c: zhaoxin: Add support for Zhaoxin I2C controller config: x86_64-buildonly-randconfig-001-20250827 (https://download.01.org/0day-ci/archive/20250827/202508271625.s6br6gQM-lkp@i...) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250827/202508271625.s6br6gQM-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202508271625.s6br6gQM-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from drivers/i2c/busses/i2c-zhaoxin.c:12: In file included from include/linux/i2c.h:19: In file included from include/linux/regulator/consumer.h:35: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:20: In file included from include/linux/mm.h:2235: include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion] 522 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_" | ~~~~~~~~~~~ ^ ~~~
drivers/i2c/busses/i2c-zhaoxin.c:176:5: warning: no previous prototype for function 'zxi2c_fifo_irq_xfer' [-Wmissing-prototypes] 176 | int zxi2c_fifo_irq_xfer(struct zxi2c *i2c, bool irq) | ^ drivers/i2c/busses/i2c-zhaoxin.c:176:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 176 | int zxi2c_fifo_irq_xfer(struct zxi2c *i2c, bool irq) | ^ | static drivers/i2c/busses/i2c-zhaoxin.c:314:5: warning: no previous prototype for function 'zxi2c_xfer' [-Wmissing-prototypes] 314 | int zxi2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) | ^ drivers/i2c/busses/i2c-zhaoxin.c:314:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 314 | int zxi2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) | ^ | static 3 warnings generated.
vim +/zxi2c_fifo_irq_xfer +176 drivers/i2c/busses/i2c-zhaoxin.c 174 175 /* 'irq == true' means in interrupt context */
176 int zxi2c_fifo_irq_xfer(struct zxi2c *i2c, bool irq) 177 { 178 u16 i; 179 u8 tmp; 180 struct i2c_msg *msg = i2c->msg; 181 void __iomem *base = i2c->base; 182 bool read = !!(msg->flags & I2C_M_RD); 183 184 if (irq) { 185 /* get the received data */ 186 if (read) 187 for (i = 0; i < i2c->xfer_len; i++) 188 msg->buf[i2c->xfered_len + i] = ioread8(base + ZXI2C_REG_HRDR); 189 190 i2c->xfered_len += i2c->xfer_len; 191 if (i2c->xfered_len == msg->len) 192 return 1; 193 } 194 195 /* reset fifo buffer */ 196 tmp = ioread8(base + ZXI2C_REG_HCR); 197 iowrite8(tmp | ZXI2C_HCR_RST_FIFO, base + ZXI2C_REG_HCR); 198 199 /* set xfer len */ 200 i2c->xfer_len = min_t(u16, msg->len - i2c->xfered_len, ZXI2C_FIFO_SIZE); 201 if (read) { 202 iowrite8(i2c->xfer_len - 1, base + ZXI2C_REG_HRLR); 203 } else { 204 iowrite8(i2c->xfer_len - 1, base + ZXI2C_REG_HTLR); 205 /* set write data */ 206 for (i = 0; i < i2c->xfer_len; i++) 207 iowrite8(msg->buf[i2c->xfered_len + i], base + ZXI2C_REG_HTDR); 208 } 209 210 /* prepare to stop transmission */ 211 if (i2c->hrv && msg->len == (i2c->xfered_len + i2c->xfer_len)) { 212 tmp = ioread8(base + ZXI2C_REG_CR); 213 tmp |= read ? ZXI2C_CR_RX_END : ZXI2C_CR_TX_END; 214 iowrite8(tmp, base + ZXI2C_REG_CR); 215 } 216 217 if (irq) { 218 /* continue transmission */ 219 tmp = ioread8(base + ZXI2C_REG_CR); 220 iowrite8(tmp |= ZXI2C_CR_CPU_RDY, base + ZXI2C_REG_CR); 221 } else { 222 u16 tcr_val = i2c->tcr; 223 224 /* start transmission */ 225 tcr_val |= read ? ZXI2C_TCR_READ : 0; 226 writew(tcr_val | msg->addr, base + ZXI2C_REG_TCR); 227 } 228 229 return 0; 230 } 231 232 static irqreturn_t zxi2c_isr(int irq, void *data) 233 { 234 struct zxi2c *i2c = data; 235 void __iomem *base = i2c->base; 236 u8 status; 237 238 /* save the status and write-clear it */ 239 status = readw(base + ZXI2C_REG_ISR); 240 if (!status) 241 return IRQ_NONE; 242 243 writew(status, base + ZXI2C_REG_ISR); 244 245 i2c->ret = 0; 246 if (status & ZXI2C_ISR_NACK_ADDR) 247 i2c->ret = -EIO; 248 249 if (!i2c->ret) { 250 if (i2c->mode == ZXI2C_BYTE_MODE) 251 i2c->ret = zxi2c_irq_xfer(i2c); 252 else 253 i2c->ret = zxi2c_fifo_irq_xfer(i2c, true); 254 } 255 256 if (i2c->ret) 257 complete(&i2c->complete); 258 259 return IRQ_HANDLED; 260 } 261 262 static int zxi2c_write(struct zxi2c *i2c, struct i2c_msg *msg, int last) 263 { 264 u16 tcr_val = i2c->tcr; 265 void __iomem *base = i2c->base; 266 267 i2c->last = last; 268 269 writew(msg->buf[0] & 0xFF, base + ZXI2C_REG_CDR); 270 271 reinit_completion(&i2c->complete); 272 273 tcr_val |= msg->addr & 0x7f; 274 275 writew(tcr_val, base + ZXI2C_REG_TCR); 276 277 if (!wait_for_completion_timeout(&i2c->complete, ZXI2C_TIMEOUT)) 278 return -ETIMEDOUT; 279 280 return i2c->ret; 281 } 282 283 static int zxi2c_read(struct zxi2c *i2c, struct i2c_msg *msg, bool first) 284 { 285 u16 val, tcr_val = i2c->tcr; 286 void __iomem *base = i2c->base; 287 288 val = readw(base + ZXI2C_REG_CR); 289 val &= ~(ZXI2C_CR_TX_END | ZXI2C_CR_RX_END); 290 291 if (msg->len == 1) 292 val |= ZXI2C_CR_RX_END; 293 294 writew(val, base + ZXI2C_REG_CR); 295 296 reinit_completion(&i2c->complete); 297 298 tcr_val |= ZXI2C_TCR_READ | (msg->addr & 0x7f); 299 300 writew(tcr_val, base + ZXI2C_REG_TCR); 301 302 if (!first) { 303 val = readw(base + ZXI2C_REG_CR); 304 val |= ZXI2C_CR_CPU_RDY; 305 writew(val, base + ZXI2C_REG_CR); 306 } 307 308 if (!wait_for_completion_timeout(&i2c->complete, ZXI2C_TIMEOUT)) 309 return -ETIMEDOUT; 310 311 return i2c->ret; 312 } 313 314 int zxi2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) 315 { 316 struct i2c_msg *msg; 317 int i; 318 int ret = 0; 319 struct zxi2c *i2c = i2c_get_adapdata(adap); 320 321 i2c->mode = ZXI2C_BYTE_MODE; 322 for (i = 0; ret >= 0 && i < num; i++) { 323 i2c->msg = msg = &msgs[i]; 324 i2c->xfered_len = 0; 325 if (msg->len == 0) 326 return -EIO; 327 328 if (msg->flags & I2C_M_RD) 329 ret = zxi2c_read(i2c, msg, i == 0); 330 else 331 ret = zxi2c_write(i2c, msg, (i + 1) == num); 332 } 333 334 return (ret < 0) ? ret : i; 335 } 336
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