From 2100a53919eec7f9a76bc67204cd89e20afa2924 Mon Sep 17 00:00:00 2001
From: Peng Fan <Peng.Fan@freescale.com>
Date: Thu, 9 Oct 2014 11:02:22 +0800
Subject: MLK-9665-1 QuadSPI: Support flash bigger than 16MB

By introducing CONFIG_SPI_FLASH_BAR and add related command in LUT to
enable fsl_qspi.c can handle flash size bigger that 16M. Because uboot
does not support 32bits address access, this means bank address should
be used to access bigger flash.

It is hard to let qspi driver dynamically set LUT, so BRRD BRWR RDEAR
and WREAR are all supported.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
---
 drivers/spi/fsl_qspi.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c
index 07374df..8439dbd 100644
--- a/drivers/spi/fsl_qspi.c
+++ b/drivers/spi/fsl_qspi.c
@@ -180,6 +180,12 @@
 #define SEQID_RDCR		9
 #define SEQID_DDR_QUAD_READ	10
 #define SEQID_BE_4K		11
+#ifdef CONFIG_SPI_FLASH_BAR
+#define SEQID_BRRD		12
+#define SEQID_BRWR		13
+#define SEQID_RDEAR		14
+#define SEQID_WREAR		15
+#endif
 
 /* Flash opcodes. */
 #define	OPCODE_WREN		0x06	/* Write enable */
@@ -214,7 +220,12 @@
 #define	OPCODE_EN4B		0xb7	/* Enter 4-byte mode */
 #define	OPCODE_EX4B		0xe9	/* Exit 4-byte mode */
 
+/* Used for Micron, winbond and Macronix flashes */
+#define	OPCODE_WREAR		0xc5	/* EAR register write */
+#define	OPCODE_RDEAR		0xc8	/* EAR reigster read */
+
 /* Used for Spansion flashes only. */
+#define	OPCODE_BRRD		0x16	/* Bank register read */
 #define	OPCODE_BRWR		0x17	/* Bank register write */
 
 /* Status Register bits. */
@@ -377,6 +388,31 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	writel(LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
 			base + QUADSPI_LUT(lut_base));
 
+#ifdef CONFIG_SPI_FLASH_BAR
+	/*
+	 * BRRD BRWR RDEAR WREAR are all supported, because it is hard to
+	 * dynamically check whether to set BRRD BRWR or RDEAR WREAR.
+	 */
+	lut_base = SEQID_BRRD * 4;
+	cmd = OPCODE_BRRD;
+	writel(LUT0(CMD, PAD1, cmd) | LUT1(READ, PAD1, 0x1),
+	       base + QUADSPI_LUT(lut_base));
+
+	lut_base = SEQID_BRWR * 4;
+	cmd = OPCODE_BRWR;
+	writel(LUT0(CMD, PAD1, cmd) | LUT1(WRITE, PAD1, 0x1),
+	       base + QUADSPI_LUT(lut_base));
+
+	lut_base = SEQID_RDEAR * 4;
+	cmd = OPCODE_RDEAR;
+	writel(LUT0(CMD, PAD1, cmd) | LUT1(READ, PAD1, 0x1),
+	       base + QUADSPI_LUT(lut_base));
+
+	lut_base = SEQID_WREAR * 4;
+	cmd = OPCODE_WREAR;
+	writel(LUT0(CMD, PAD1, cmd) | LUT1(WRITE, PAD1, 0x1),
+	       base + QUADSPI_LUT(lut_base));
+#endif
 
 	fsl_qspi_lock_lut(q);
 }
@@ -589,6 +625,16 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
 		return SEQID_DDR_QUAD_READ;
 	case OPCODE_BE_4K:
 		return SEQID_BE_4K;
+#ifdef CONFIG_SPI_FLASH_BAR
+	case OPCODE_BRRD:
+		return SEQID_BRRD;
+	case OPCODE_BRWR:
+		return SEQID_BRWR;
+	case OPCODE_RDEAR:
+		return SEQID_RDEAR;
+	case OPCODE_WREAR:
+		return SEQID_WREAR;
+#endif
 	default:
 		break;
 	}
@@ -682,7 +728,10 @@ fsl_qspi_runcmd(struct fsl_qspi *q, u8 cmd, unsigned int addr, int len)
 	/* restore the MCR */
 	writel(reg, base + QUADSPI_MCR);
 
-	if ((OPCODE_SE == cmd) || (OPCODE_PP == cmd) || (OPCODE_BE_4K == cmd))
+	/* After switch BANK, AHB buffer should also be invalid. */
+	if ((OPCODE_SE == cmd) || (OPCODE_PP == cmd) ||
+	    (OPCODE_BE_4K == cmd) || (OPCODE_WREAR == cmd) ||
+	    (OPCODE_BRWR == cmd))
 		fsl_qspi_invalid(q);
 	return err;
 }
-- 
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