linux-kernel - [PATCH v4 2/2] mtd: spi-nor: cadence-quadspi: Disable the auto-poll for Intel LGM SoC

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Date:   Thu, 17 Oct 2019 15:20:00 +0800
From:   "Ramuthevar,Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
To:     linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        dwmw2@...radead.org, computersforpeace@...il.com, richard@....at,
        jwboyer@...il.com, boris.brezillon@...e-electrons.com,
        cyrille.pitchen@...el.com, david.oberhollenzer@...ma-star.at,
        miquel.raynal@...tlin.com, tudor.ambarus@...il.com,
        vigneshr@...com, andriy.shevchenko@...el.com,
        cheol.yong.kim@...el.com, qi-ming.wu@...el.com,
        Ramuthevar Vadivel Murugan 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
Subject: [PATCH v4 2/2] mtd: spi-nor: cadence-quadspi: Disable the auto-poll for Intel LGM SoC

From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>

On Intel Lightning Mountain SoCs QSPI controller do not use auto-poll.
This patch disables auto polling when direct access mode is disabled

Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
---
 drivers/mtd/spi-nor/cadence-quadspi.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
index 0ad076eaa81b..c2333f0473e3 100644
--- a/drivers/mtd/spi-nor/cadence-quadspi.c
+++ b/drivers/mtd/spi-nor/cadence-quadspi.c
@@ -88,6 +88,7 @@ struct cqspi_st {
 	bool			rclk_en;
 	u32			trigger_address;
 	u32			wr_delay;
+	bool			auto_poll;
 	struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT];
 };
 
@@ -136,6 +137,8 @@ struct cqspi_driver_platdata {
 #define CQSPI_REG_RD_INSTR_TYPE_DATA_MASK	0x3
 #define CQSPI_REG_RD_INSTR_DUMMY_MASK		0x1F
 
+#define CQSPI_REG_WR_COMPLETION_CTRL			0x38
+#define CQSPI_REG_WR_COMPLETION_DISABLE_AUTO_POLL	BIT(14)
 #define CQSPI_REG_WR_INSTR			0x08
 #define CQSPI_REG_WR_INSTR_OPCODE_LSB		0
 #define CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB	12
@@ -1175,6 +1178,18 @@ static int cqspi_of_get_pdata(struct platform_device *pdev)
 	return 0;
 }
 
+static int cqspi_disable_auto_poll(struct cqspi_st *cqspi)
+{
+	void __iomem *reg_base = cqspi->iobase;
+	unsigned int reg;
+
+	reg = readl(reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
+	reg |= CQSPI_REG_WR_COMPLETION_DISABLE_AUTO_POLL;
+	writel(reg, reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
+
+	return 0;
+}
+
 static void cqspi_controller_init(struct cqspi_st *cqspi)
 {
 	u32 reg;
@@ -1206,6 +1221,10 @@ static void cqspi_controller_init(struct cqspi_st *cqspi)
 	reg |= CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;
 	writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
 
+	/* Disable auto-polling */
+	if (!cqspi->auto_poll)
+		cqspi_disable_auto_poll(cqspi);
+
 	cqspi_controller_enable(cqspi, 1);
 }
 
@@ -1421,6 +1440,9 @@ static int cqspi_probe(struct platform_device *pdev)
 		cqspi->wr_delay = 5 * DIV_ROUND_UP(NSEC_PER_SEC,
 						   cqspi->master_ref_clk_hz);
 
+	if (ddata && (ddata->quirks & CQSPI_DISABLE_DAC_MODE))
+		cqspi->auto_poll = false;
+
 	ret = devm_request_irq(dev, irq, cqspi_irq_handler, 0,
 			       pdev->name, cqspi);
 	if (ret) {
-- 
2.11.0