Re: [PATCH 5/7] soc: aspeed: Add eSPI flash channel support

Hi aspeedyh,

kernel test robot noticed the following build errors:

[auto build test ERROR on 0257f64bdac7fdca30fa3cae0df8b9ecbec7733a]

url:    https://github.com/intel-lab-lkp/linux/commits/aspeedyh/dt-bindings-soc-aspeed-Add-AST2600-eSPI-controller/20260315-101647
base:   0257f64bdac7fdca30fa3cae0df8b9ecbec7733a
patch link:    https://lore.kernel.org/r/20260313-upstream_espi-v1-5-9504428e1f43%40aspeedtech.com
patch subject: [PATCH 5/7] soc: aspeed: Add eSPI flash channel support
config: riscv-allyesconfig (https://download.01.org/0day-ci/archive/20260320/[email protected]/config)
compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260320/[email protected]/reproduce)

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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

>> drivers/soc/aspeed/espi/ast2600-espi.c:137:9: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           reg |= FIELD_PREP(ESPI_CTRL_FLASH_TAFS_MODE, flash->tafs.mode);
                  ^
   drivers/soc/aspeed/espi/ast2600-espi.c:172:28: warning: variable 'flash' set but not used [-Wunused-but-set-variable]
           struct aspeed_espi_flash *flash;
                                     ^
>> drivers/soc/aspeed/espi/ast2600-espi.c:194:13: error: call to undeclared function 'FIELD_GET'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           hdr->cyc = FIELD_GET(ESPI_FLASH_RX_CTRL_CYC, reg);
                      ^
   drivers/soc/aspeed/espi/ast2600-espi.c:243:8: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           reg = FIELD_PREP(ESPI_FLASH_TX_CTRL_CYC, cyc) |
                 ^
   1 warning and 3 errors generated.


vim +/FIELD_PREP +137 drivers/soc/aspeed/espi/ast2600-espi.c

   111	
   112	static void ast2600_espi_flash_reset(struct aspeed_espi *espi)
   113	{
   114		struct aspeed_espi_flash *flash;
   115		u32 reg;
   116	
   117		flash = &espi->flash;
   118	
   119		writel(ESPI_INT_EN_FLASH, espi->regs + ESPI_INT_EN_CLR);
   120		writel(ESPI_INT_STS_FLASH, espi->regs + ESPI_INT_STS);
   121	
   122		reg = readl(espi->regs + ESPI_CTRL);
   123		reg &= ~(ESPI_CTRL_FLASH_TX_SW_RST
   124			 | ESPI_CTRL_FLASH_RX_SW_RST
   125			 | ESPI_CTRL_FLASH_TX_DMA_EN
   126			 | ESPI_CTRL_FLASH_RX_DMA_EN
   127			 | ESPI_CTRL_FLASH_SW_RDY);
   128		writel(reg, espi->regs + ESPI_CTRL);
   129	
   130		udelay(1);
   131	
   132		reg |= (ESPI_CTRL_FLASH_TX_SW_RST | ESPI_CTRL_FLASH_RX_SW_RST);
   133		writel(reg, espi->regs + ESPI_CTRL);
   134	
   135		flash->tafs.mode = TAFS_MODE_SW;
   136		reg = readl(espi->regs + ESPI_CTRL) & ~ESPI_CTRL_FLASH_TAFS_MODE;
 > 137		reg |= FIELD_PREP(ESPI_CTRL_FLASH_TAFS_MODE, flash->tafs.mode);
   138		writel(reg, espi->regs + ESPI_CTRL);
   139	
   140		if (flash->dma.enable) {
   141			writel(flash->dma.tx_addr, espi->regs + ESPI_FLASH_TX_DMA);
   142			writel(flash->dma.rx_addr, espi->regs + ESPI_FLASH_RX_DMA);
   143	
   144			reg = readl(espi->regs + ESPI_CTRL)
   145			      | ESPI_CTRL_FLASH_TX_DMA_EN
   146			      | ESPI_CTRL_FLASH_RX_DMA_EN;
   147			writel(reg, espi->regs + ESPI_CTRL);
   148		}
   149	
   150		writel(ESPI_INT_EN_FLASH_RX_CMPLT, espi->regs + ESPI_INT_EN);
   151	
   152		reg = readl(espi->regs + ESPI_CTRL) | ESPI_CTRL_FLASH_SW_RDY;
   153		writel(reg, espi->regs + ESPI_CTRL);
   154	}
   155	
   156	int ast2600_espi_flash_probe(struct aspeed_espi *espi)
   157	{
   158		u32 regs;
   159	
   160		regs = readl(espi->regs + ESPI_STS);
   161		if (regs & (ESPI_STS_FLASH_TX_BUSY | ESPI_STS_FLASH_RX_BUSY)) {
   162			dev_warn(espi->dev, "eSPI flash channel is busy, deferring...\n");
   163			return -EPROBE_DEFER;
   164		}
   165	
   166		ast2600_espi_flash_reset(espi);
   167		return 0;
   168	}
   169	
   170	int ast2600_espi_flash_remove(struct aspeed_espi *espi)
   171	{
   172		struct aspeed_espi_flash *flash;
   173		u32 reg;
   174	
   175		flash = &espi->flash;
   176	
   177		writel(ESPI_INT_EN_FLASH, espi->regs + ESPI_INT_EN_CLR);
   178	
   179		reg = readl(espi->regs + ESPI_CTRL);
   180		reg &= ~(ESPI_CTRL_FLASH_TX_DMA_EN
   181			 | ESPI_CTRL_FLASH_RX_DMA_EN
   182			 | ESPI_CTRL_FLASH_SW_RDY);
   183		writel(reg, espi->regs + ESPI_CTRL);
   184	
   185		return 0;
   186	}
   187	
   188	int ast2600_espi_flash_get_hdr(struct aspeed_espi *espi,
   189				       struct espi_comm_hdr *hdr)
   190	{
   191		u32 reg, len;
   192	
   193		reg = readl(espi->regs + ESPI_FLASH_RX_CTRL);
 > 194		hdr->cyc = FIELD_GET(ESPI_FLASH_RX_CTRL_CYC, reg);
   195		hdr->tag = FIELD_GET(ESPI_FLASH_RX_CTRL_TAG, reg);
   196		len = FIELD_GET(ESPI_FLASH_RX_CTRL_LEN, reg);
   197		hdr->len_h = (len >> 8) & 0xff;
   198		hdr->len_l = len & 0xff;
   199	
   200		return 0;
   201	}
   202	

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