openwrt/target/linux/layerscape/patches-5.4/817-spi-0007-LF-18-3-spi-fsl-qspi-Allocate-AHB-memory-dynamically.patch

From 2fc26b1b6377156e07c6c9ce934c58f634fcd21b Mon Sep 17 00:00:00 2001
From: Kuldeep Singh <kuldeep.singh@nxp.com>
Date: Wed, 1 Apr 2020 14:51:37 +0800
Subject: [PATCH] LF-18-3 spi: fsl-qspi: Allocate AHB memory dynamically for
 imx platforms

LS platforms doesn't require dynamic allocaltion of AHB memory. So, let's
define a quirk which allocates AHB memory dynamically only for imx
platforms.

Fixes: c70adc97("spi: spi-fsl-qspi: dynamically alloc AHB memory for QSPI")
Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
[rebase]
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
---
 drivers/spi/spi-fsl-qspi.c | 71 +++++++++++++++++++++++++++++++++++-----------
 1 file changed, 55 insertions(+), 16 deletions(-)

--- a/drivers/spi/spi-fsl-qspi.c
+++ b/drivers/spi/spi-fsl-qspi.c
@@ -197,6 +197,12 @@
  */
 #define QUADSPI_QUIRK_USE_TDH_SETTING	BIT(5)
 
+/*
+ * Use flash size for imx platforms and not for LS platforms. Define a
+ * quirk which enables it only on imx platforms.
+ */
+#define QUADSPI_QUIRK_USE_FLASH_SIZE	BIT(6)
+
 #define QUADSPI_MIN_IOMAP		SZ_4M
 
 struct fsl_qspi_devtype_data {
@@ -213,7 +219,7 @@ static const struct fsl_qspi_devtype_dat
 	.txfifo = SZ_64,
 	.invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID,
 	.ahb_buf_size = SZ_1K,
-	.quirks = QUADSPI_QUIRK_SWAP_ENDIAN,
+	.quirks = QUADSPI_QUIRK_SWAP_ENDIAN | QUADSPI_QUIRK_USE_FLASH_SIZE,
 	.little_endian = true,
 };
 
@@ -222,7 +228,8 @@ static const struct fsl_qspi_devtype_dat
 	.txfifo = SZ_512,
 	.invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID,
 	.ahb_buf_size = SZ_1K,
-	.quirks = QUADSPI_QUIRK_4X_INT_CLK | QUADSPI_QUIRK_TKT245618,
+	.quirks = QUADSPI_QUIRK_4X_INT_CLK | QUADSPI_QUIRK_TKT245618 |
+		  QUADSPI_QUIRK_USE_FLASH_SIZE,
 	.little_endian = true,
 };
 
@@ -232,7 +239,7 @@ static const struct fsl_qspi_devtype_dat
 	.invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID,
 	.ahb_buf_size = SZ_1K,
 	.quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_4X_INT_CLK |
-		  QUADSPI_QUIRK_USE_TDH_SETTING,
+		  QUADSPI_QUIRK_USE_TDH_SETTING | QUADSPI_QUIRK_USE_FLASH_SIZE,
 	.little_endian = true,
 };
 
@@ -242,7 +249,7 @@ static const struct fsl_qspi_devtype_dat
 	.invalid_mstrid = QUADSPI_BUFXCR_INVALID_MSTRID,
 	.ahb_buf_size = SZ_1K,
 	.quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_4X_INT_CLK |
-		  QUADSPI_QUIRK_USE_TDH_SETTING,
+		  QUADSPI_QUIRK_USE_TDH_SETTING | QUADSPI_QUIRK_USE_FLASH_SIZE,
 	.little_endian = true,
 };
 
@@ -310,6 +317,11 @@ static inline int needs_tdh_setting(stru
 	return q->devtype_data->quirks & QUADSPI_QUIRK_USE_TDH_SETTING;
 }
 
+static inline int needs_flash_size(struct fsl_qspi *q)
+{
+	return q->devtype_data->quirks & QUADSPI_QUIRK_USE_FLASH_SIZE;
+}
+
 /*
  * An IC bug makes it necessary to rearrange the 32-bit data.
  * Later chips, such as IMX6SLX, have fixed this bug.
@@ -556,6 +568,14 @@ static void fsl_qspi_select_mem(struct f
 
 static int fsl_qspi_read_ahb(struct fsl_qspi *q, const struct spi_mem_op *op)
 {
+	if (!needs_flash_size(q)) {
+		u32 size = q->devtype_data->ahb_buf_size;
+		memcpy_fromio(op->data.buf.in,
+			      q->ahb_addr + q->selected * size,
+			      op->data.nbytes);
+		return 0;
+	}
+
 	u32 start = op->addr.val + q->selected * q->memmap_phy_size / 4;
 	u32 len = op->data.nbytes;
 
@@ -674,6 +694,7 @@ static int fsl_qspi_exec_op(struct spi_m
 	u32 addr_offset = 0;
 	int err = 0;
 	int invalid_mstrid = q->devtype_data->invalid_mstrid;
+	u32 size = q->devtype_data->ahb_buf_size;
 
 	mutex_lock(&q->lock);
 
@@ -686,8 +707,11 @@ static int fsl_qspi_exec_op(struct spi_m
 	if (needs_amba_base_offset(q))
 		addr_offset = q->memmap_phy;
 
+	if (needs_flash_size(q))
+		size = q->memmap_phy_size / 4;
+
 	qspi_writel(q,
-		    q->selected * q->memmap_phy_size / 4 + addr_offset,
+		    q->selected * size + addr_offset,
 		    base + QUADSPI_SFAR);
 
 	qspi_writel(q, qspi_readl(q, base + QUADSPI_MCR) |
@@ -751,6 +775,7 @@ static int fsl_qspi_default_setup(struct
 	void __iomem *base = q->iobase;
 	u32 reg, addr_offset = 0;
 	int ret;
+	u32 size = q->devtype_data->ahb_buf_size;
 
 	/* disable and unprepare clock to avoid glitch pass to controller */
 	fsl_qspi_clk_disable_unprep(q);
@@ -805,19 +830,22 @@ static int fsl_qspi_default_setup(struct
 		addr_offset = q->memmap_phy;
 
 	/*
-	 * In HW there can be a maximum of four chips on two buses with
-	 * two chip selects on each bus. We use four chip selects in SW
-	 * to differentiate between the four chips.
-	 * We divide the total memory region size equally for each chip
-	 * and set SFA1AD, SFA2AD, SFB1AD, SFB2AD accordingly.
+	 * In HW there can be a maximum of four chips on two buses with two
+	 * chip selects on each bus. We use four chip selects in SW to
+	 * differentiate between the four chips. We divide the total memory
+	 * region/ahb_buf_size size equally for each chip and set SFA1AD,
+	 * SFA2AD, SFB1AD, SFB2AD accordingly.
 	 */
-	qspi_writel(q, q->memmap_phy_size / 4 + addr_offset,
+	if (needs_flash_size(q))
+		size = q->memmap_phy_size / 4;
+
+	qspi_writel(q, size + addr_offset,
 		    base + QUADSPI_SFA1AD);
-	qspi_writel(q, q->memmap_phy_size / 4 * 2 + addr_offset,
+	qspi_writel(q, size * 2 + addr_offset,
 		    base + QUADSPI_SFA2AD);
-	qspi_writel(q, q->memmap_phy_size / 4 * 3 + addr_offset,
+	qspi_writel(q, size * 3 + addr_offset,
 		    base + QUADSPI_SFB1AD);
-	qspi_writel(q, q->memmap_phy_size / 4 * 4 + addr_offset,
+	qspi_writel(q, size * 4 + addr_offset,
 		    base + QUADSPI_SFB2AD);
 
 	q->selected = -1;
@@ -904,6 +932,15 @@ static int fsl_qspi_probe(struct platfor
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 					"QuadSPI-memory");
+
+	if (!needs_flash_size(q)) {
+		q->ahb_addr = devm_ioremap_resource(dev, res);
+		if (IS_ERR(q->ahb_addr)) {
+			ret = PTR_ERR(q->ahb_addr);
+			goto err_put_ctrl;
+		}
+	}
+
 	q->memmap_phy = res->start;
 	q->memmap_phy_size = resource_size(res);
 
@@ -979,8 +1016,10 @@ static int fsl_qspi_remove(struct platfo
 
 	mutex_destroy(&q->lock);
 
-	if (q->ahb_addr)
-		iounmap(q->ahb_addr);
+	if (needs_flash_size(q)) {
+		if (q->ahb_addr)
+			iounmap(q->ahb_addr);
+	}
 
 	return 0;
 }