[PATCH v4 2/4] spi: spi-sg2044-nor: Add configurable chip_info

[Zixian Zeng]

SG2044 and SG2042 have similar SPI-NOR flash controller design,
but have incompatibility which causes existing driver
not working on SG2042:
1. SPI-NOR flash controller on SG2042 have no OPT register.
2. FIFO trigger level on SG2042 should be strictly less than 8.

So introduce a new configurable chip_info structure to hold the
different configuration.

Link: https://github.com/sophgo/sophgo-doc/blob/main/SG2042/TRM/source/SPI-flash.rst
Signed-off-by: Zixian Zeng <sycamoremoon376 at gmail.com>
---
 drivers/spi/spi-sg2044-nor.c | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-sg2044-nor.c b/drivers/spi/spi-sg2044-nor.c
index a59aa3fc55d277653d01df9c83b3f0aa08edab46..0ef569eb28b7609df1f23d89a6b3e7afc2569c80 100644
--- a/drivers/spi/spi-sg2044-nor.c
+++ b/drivers/spi/spi-sg2044-nor.c
@@ -84,12 +84,18 @@
 
 #define SPIFMC_MAX_READ_SIZE			0x10000
 
+struct sg204x_spifmc_chip_info {
+	bool has_opt_reg;
+	u32 rd_fifo_int_trigger_level;
+};
+
 struct sg2044_spifmc {
 	struct spi_controller *ctrl;
 	void __iomem *io_base;
 	struct device *dev;
 	struct mutex lock;
 	struct clk *clk;
+	const struct sg204x_spifmc_chip_info *chip_info;
 };
 
 static int sg2044_spifmc_wait_int(struct sg2044_spifmc *spifmc, u8 int_type)
@@ -139,7 +145,7 @@ static ssize_t sg2044_spifmc_read_64k(struct sg2044_spifmc *spifmc,
 
 	reg = sg2044_spifmc_init_reg(spifmc);
 	reg |= (op->addr.nbytes + op->dummy.nbytes) << SPIFMC_TRAN_CSR_ADDR_BYTES_SHIFT;
-	reg |= SPIFMC_TRAN_CSR_FIFO_TRG_LVL_8_BYTE;
+	reg |= spifmc->chip_info->rd_fifo_int_trigger_level;
 	reg |= SPIFMC_TRAN_CSR_WITH_CMD;
 	reg |= SPIFMC_TRAN_CSR_TRAN_MODE_RX;
 
@@ -335,7 +341,8 @@ static ssize_t sg2044_spifmc_trans_reg(struct sg2044_spifmc *spifmc,
 		reg |= SPIFMC_TRAN_CSR_TRAN_MODE_RX;
 		reg |= SPIFMC_TRAN_CSR_TRAN_MODE_TX;
 
-		writel(SPIFMC_OPT_DISABLE_FIFO_FLUSH, spifmc->io_base + SPIFMC_OPT);
+		if (spifmc->chip_info->has_opt_reg)
+			writel(SPIFMC_OPT_DISABLE_FIFO_FLUSH, spifmc->io_base + SPIFMC_OPT);
 	} else {
 		/*
 		 * If write values to the Status Register,
@@ -457,6 +464,11 @@ static int sg2044_spifmc_probe(struct platform_device *pdev)
 	ret = devm_mutex_init(dev, &spifmc->lock);
 	if (ret)
 		return ret;
+	spifmc->chip_info = device_get_match_data(&pdev->dev);
+	if (!spifmc->chip_info) {
+		dev_err(&pdev->dev, "Failed to get specific chip info\n");
+		return -EINVAL;
+	}
 
 	sg2044_spifmc_init(spifmc);
 	sg2044_spifmc_init_reg(spifmc);
@@ -468,8 +480,13 @@ static int sg2044_spifmc_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct sg204x_spifmc_chip_info sg2044_chip_info = {
+	.has_opt_reg = true,
+	.rd_fifo_int_trigger_level = SPIFMC_TRAN_CSR_FIFO_TRG_LVL_8_BYTE,
+};
+
 static const struct of_device_id sg2044_spifmc_match[] = {
-	{ .compatible = "sophgo,sg2044-spifmc-nor" },
+	{ .compatible = "sophgo,sg2044-spifmc-nor", .data = &sg2044_chip_info },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sg2044_spifmc_match);

-- 
2.49.0