spi: cadence-quadspi: Support for device reset via OSPI controller

Add support for flash device reset via ospi controller, instead of
using GPIO, as ospi IP has device reset feature on Versal Gen2 platform.

Signed-off-by: Srikanth Boyapally <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: SrikanthGoud123

drivers/spi/spi-cadence-quadspi.c

@@ -44,6 +44,7 @@ static_assert(CQSPI_MAX_CHIPSELECT <= SPI_CS_CNT_MAX);
 #define CQSPI_NEEDS_APB_AHB_HAZARD_WAR	BIT(5)
 #define CQSPI_RD_NO_IRQ			BIT(6)
 #define CQSPI_DMA_SET_MASK		BIT(7)
+#define CQSPI_SUPPORT_DEVICE_RESET	BIT(8)
 
 /* Capabilities */
 #define CQSPI_SUPPORTS_OCTAL		BIT(0)
@@ -110,7 +111,7 @@ struct cqspi_st {
 
 struct cqspi_driver_platdata {
 	u32 hwcaps_mask;
-	u8 quirks;
+	u16 quirks;
 	int (*indirect_read_dma)(struct cqspi_flash_pdata *f_pdata,
 				 u_char *rxbuf, loff_t from_addr, size_t n_rx);
 	u32 (*get_dma_status)(struct cqspi_st *cqspi);
@@ -145,6 +146,8 @@ struct cqspi_driver_platdata {
 #define CQSPI_REG_CONFIG_IDLE_LSB		31
 #define CQSPI_REG_CONFIG_CHIPSELECT_MASK	0xF
 #define CQSPI_REG_CONFIG_BAUD_MASK		0xF
+#define CQSPI_REG_CONFIG_RESET_PIN_FLD_MASK    BIT(5)
+#define CQSPI_REG_CONFIG_RESET_CFG_FLD_MASK    BIT(6)
 
 #define CQSPI_REG_RD_INSTR			0x04
 #define CQSPI_REG_RD_INSTR_OPCODE_LSB		0
@@ -831,6 +834,25 @@ static int cqspi_indirect_read_execute(struct cqspi_flash_pdata *f_pdata,
 	return ret;
 }
 
+static void cqspi_device_reset(struct cqspi_st *cqspi)
+{
+	u32 reg;
+
+	reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);
+	reg |= CQSPI_REG_CONFIG_RESET_CFG_FLD_MASK;
+	writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
+	/*
+	 * NOTE: Delay timing implementation is derived from
+	 * spi_nor_hw_reset()
+	 */
+	writel(reg & ~CQSPI_REG_CONFIG_RESET_PIN_FLD_MASK, cqspi->iobase + CQSPI_REG_CONFIG);
+	usleep_range(1, 5);
+	writel(reg | CQSPI_REG_CONFIG_RESET_PIN_FLD_MASK, cqspi->iobase + CQSPI_REG_CONFIG);
+	usleep_range(100, 150);
+	writel(reg & ~CQSPI_REG_CONFIG_RESET_PIN_FLD_MASK, cqspi->iobase + CQSPI_REG_CONFIG);
+	usleep_range(1000, 1200);
+}
+
 static void cqspi_controller_enable(struct cqspi_st *cqspi, bool enable)
 {
 	void __iomem *reg_base = cqspi->iobase;
@@ -1912,6 +1934,9 @@ static int cqspi_probe(struct platform_device *pdev)
 
 	host->num_chipselect = cqspi->num_chipselect;
 
+	if (ddata->quirks & CQSPI_SUPPORT_DEVICE_RESET)
+		cqspi_device_reset(cqspi);
+
 	if (cqspi->use_direct_mode) {
 		ret = cqspi_request_mmap_dma(cqspi);
 		if (ret == -EPROBE_DEFER)
@@ -2054,6 +2079,15 @@ static const struct cqspi_driver_platdata versal_ospi = {
 	.get_dma_status = cqspi_get_versal_dma_status,
 };
 
+static const struct cqspi_driver_platdata versal2_ospi = {
+	.hwcaps_mask = CQSPI_SUPPORTS_OCTAL,
+	.quirks = CQSPI_DISABLE_DAC_MODE | CQSPI_SUPPORT_EXTERNAL_DMA
+			| CQSPI_DMA_SET_MASK
+			| CQSPI_SUPPORT_DEVICE_RESET,
+	.indirect_read_dma = cqspi_versal_indirect_read_dma,
+	.get_dma_status = cqspi_get_versal_dma_status,
+};
+
 static const struct cqspi_driver_platdata jh7110_qspi = {
 	.quirks = CQSPI_DISABLE_DAC_MODE,
 	.jh7110_clk_init = cqspi_jh7110_clk_init,
@@ -2106,6 +2140,10 @@ static const struct of_device_id cqspi_dt_ids[] = {
 		.compatible = "mobileye,eyeq5-ospi",
 		.data = &mobileye_eyeq5_ospi,
 	},
+	{
+		.compatible = "amd,versal2-ospi",
+		.data = &versal2_ospi,
+	},
 	{ /* end of table */ }
 };