brcm63xx: enable dual rx/tx spi support for hsspi

should improve flash access times. Should be harmless to gnerally
enable regardless if a flash supporting dual reads is attached. In
doubt, spi-nor will just fall back to serial reads.

Signed-off-by: Jonas Gorski <[email protected]>

SVN-Revision: 46725

target/linux/brcm63xx/patches-4.1/010-4.3-01-spi-bcm63xx-hsspi-add-support-for-dual-spi-read-writ.patch

@@ -0,0 +1,68 @@
+From 61dc388f577b6f984797949f32c30021d9ea73dc Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <[email protected]>
+Date: Sun, 23 Aug 2015 12:16:02 +0200
+Subject: [PATCH V2] spi/bcm63xx-hsspi: add support for dual spi read/write
+
+Add support for dual read/writes on spi-bcm63xx-hsspi. This has been
+tested with a s25fl129p1 dual read capable spi flash, with a nice speed
+improvement:
+
+serial read:
+
+root@OpenWrt:/# time dd if=/dev/mtd4 of=/dev/null bs=8192
+2032+0 records in
+2032+0 records out
+real    0m 4.39s
+user    0m 0.00s
+sys     0m 1.55s
+
+dual read:
+
+root@OpenWrt:/# time dd if=/dev/mtd4 of=/dev/null bs=8192
+2032+0 records in
+2032+0 records out
+real    0m 3.09s
+user    0m 0.00s
+sys     0m 1.56s
+
+Signed-off-by: Jonas Gorski <[email protected]>
+---
+ drivers/spi/spi-bcm63xx-hsspi.c | 13 +++++++++----
+ 1 file changed, 9 insertions(+), 4 deletions(-)
+
+--- a/drivers/spi/spi-bcm63xx-hsspi.c
++++ b/drivers/spi/spi-bcm63xx-hsspi.c
+@@ -76,6 +76,7 @@
+ #define HSSPI_FIFO_REG(x)			(0x200 + (x) * 0x200)
+ 
+ 
++#define HSSPI_OP_MULTIBIT			BIT(11)
+ #define HSSPI_OP_CODE_SHIFT			13
+ #define HSSPI_OP_SLEEP				(0 << HSSPI_OP_CODE_SHIFT)
+ #define HSSPI_OP_READ_WRITE			(1 << HSSPI_OP_CODE_SHIFT)
+@@ -171,9 +172,12 @@ static int bcm63xx_hsspi_do_txrx(struct
+ 	if (opcode != HSSPI_OP_READ)
+ 		step_size -= HSSPI_OPCODE_LEN;
+ 
+-	__raw_writel(0 << MODE_CTRL_PREPENDBYTE_CNT_SHIFT |
+-		     2 << MODE_CTRL_MULTIDATA_WR_STRT_SHIFT |
+-		     2 << MODE_CTRL_MULTIDATA_RD_STRT_SHIFT | 0xff,
++	if ((opcode == HSSPI_OP_READ && t->rx_nbits == SPI_NBITS_DUAL) ||
++	    (opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL))
++		opcode |= HSSPI_OP_MULTIBIT;
++
++	__raw_writel(1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT |
++		     1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT | 0xff,
+ 		     bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select));
+ 
+ 	while (pending > 0) {
+@@ -374,7 +378,8 @@ static int bcm63xx_hsspi_probe(struct pl
+ 	master->num_chipselect = 8;
+ 	master->setup = bcm63xx_hsspi_setup;
+ 	master->transfer_one_message = bcm63xx_hsspi_transfer_one;
+-	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
++	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH |
++			    SPI_RX_DUAL | SPI_TX_DUAL;
+ 	master->bits_per_word_mask = SPI_BPW_MASK(8);
+ 	master->auto_runtime_pm = true;
+ 

target/linux/brcm63xx/patches-4.1/411-MIPS-BCM63XX-Register-SPI-flash-if-present.patch

@@ -5,7 +5,7 @@ Subject: [PATCH 29/60] MIPS: BCM63XX: Register SPI flash if present
 
 Signed-off-by: Jonas Gorski <[email protected]>
 ---
- arch/mips/bcm63xx/dev-flash.c                     |   33 +++++++++++++++++++-
+ arch/mips/bcm63xx/dev-flash.c                     |   35 +++++++++++++++++++-
  arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h |    2 +
  2 files changed, 33 insertions(+), 2 deletions(-)
 
@@ -95,15 +95,17 @@ Signed-off-by: Jonas Gorski <[email protected]>
  		if (val & STRAPBUS_63268_BOOT_SEL_SERIAL)
  			return BCM63XX_FLASH_TYPE_SERIAL;
  		else
-@@ -195,8 +232,15 @@ int __init bcm63xx_flash_register(void)
+@@ -195,8 +232,17 @@ int __init bcm63xx_flash_register(void)
  
  		return platform_device_register(&mtd_dev);
  	case BCM63XX_FLASH_TYPE_SERIAL:
 -		pr_warn("unsupported serial flash detected\n");
 -		return -ENODEV;
 +		if (BCMCPU_IS_6318() || BCMCPU_IS_6328() || BCMCPU_IS_6362() ||
-+		    BCMCPU_IS_63268())
++		    BCMCPU_IS_63268()) {
 +			bcm63xx_spi_flash_info[0].bus_num = 1;
++			bcm63xx_spi_flash_info[0].mode = SPI_RX_DUAL;
++		}
 +
 +		if (BCMCPU_IS_6358() || BCMCPU_IS_6368())
 +			bcm63xx_flash_data.max_transfer_len = SPI_6358_MSG_DATA_SIZE;

target/linux/brcm63xx/patches-4.1/415-MIPS-BCM63XX-export-the-attached-flash-type.patch

@@ -11,7 +11,7 @@ Signed-off-by: Jonas Gorski <[email protected]>
 
 --- a/arch/mips/bcm63xx/dev-flash.c
 +++ b/arch/mips/bcm63xx/dev-flash.c
-@@ -250,3 +250,8 @@ int __init bcm63xx_flash_register(void)
+@@ -252,3 +252,8 @@ int __init bcm63xx_flash_register(void)
  		return -ENODEV;
  	}
  }