ENGR00244769-2 [NOR FLASH]-Improve WEIM NOR speed

Increase the NOR flash read speed.
Added weimnor driver to use cached (and page mode) reads.

Signed-off-by: Oliver Brown <oliver.brown@freescale.com>

2 files changed, 47 insertions, 13 deletions

diff --git a/arch/arm/configs/imx6_defconfig b/arch/arm/configs/imx6_defconfig
index fc897eddcfa3..3b2d31e4c4d2 100644
--- a/arch/arm/configs/imx6_defconfig
+++ b/arch/arm/configs/imx6_defconfig
@@ -301,6 +301,7 @@ CONFIG_IMX_HAVE_PLATFORM_IMX_PCIE=y
 # CONFIG_ARCH_MX503 is not set
 # CONFIG_ARCH_MX51 is not set
 CONFIG_ARCH_MX6=y
+# CONFIG_MACH_IMX_BLUETOOTH_RFKILL is not set
 CONFIG_ARCH_MX6Q=y
 CONFIG_FORCE_MAX_ZONEORDER=14
 CONFIG_SOC_IMX6Q=y
@@ -752,8 +753,8 @@ CONFIG_MTD_CFI_UTIL=y
 # Mapping drivers for chip access
 #
 # CONFIG_MTD_COMPLEX_MAPPINGS is not set
-CONFIG_MTD_PHYSMAP=y
-# CONFIG_MTD_PHYSMAP_COMPAT is not set
+# CONFIG_MTD_PHYSMAP is not set
+CONFIG_MTD_IMX6X_WEIMNOR=y
 # CONFIG_MTD_ARM_INTEGRATOR is not set
 # CONFIG_MTD_PLATRAM is not set
 
@@ -1099,6 +1100,7 @@ CONFIG_TOUCHSCREEN_MAX11801=y
 # CONFIG_TOUCHSCREEN_TOUCHWIN is not set
 # CONFIG_TOUCHSCREEN_WM97XX is not set
 # CONFIG_TOUCHSCREEN_USB_COMPOSITE is not set
+# CONFIG_TOUCHSCREEN_NOVATEK is not set
 # CONFIG_TOUCHSCREEN_TOUCHIT213 is not set
 # CONFIG_TOUCHSCREEN_TSC2005 is not set
 # CONFIG_TOUCHSCREEN_TSC2007 is not set
@@ -1957,6 +1959,7 @@ CONFIG_USB_OTG=y
 #
 # CONFIG_USB_C67X00_HCD is not set
 CONFIG_USB_EHCI_HCD=y
+# CONFIG_FSL_USB_TEST_MODE is not set
 CONFIG_USB_EHCI_ARC=y
 CONFIG_USB_EHCI_ARC_OTG=y
 # CONFIG_USB_EHCI_ARC_HSIC is not set
diff --git a/arch/arm/mach-mx6/board-mx6q_sabreauto.c b/arch/arm/mach-mx6/board-mx6q_sabreauto.c
index 4222730bbaba..f028fa828304 100644
--- a/arch/arm/mach-mx6/board-mx6q_sabreauto.c
+++ b/arch/arm/mach-mx6/board-mx6q_sabreauto.c
@@ -438,6 +438,7 @@ static struct spi_board_info m25p32_spi0_board_info[] __initdata = {
 		.platform_data	= &m25p32_spi_flash_data,
 	},
 };
+
 static void spi_device_init(void)
 {
 	spi_register_board_info(m25p32_spi0_board_info,
@@ -478,8 +479,8 @@ static struct physmap_flash_data nor_flash_data = {
 	.nr_parts	= ARRAY_SIZE(mxc_nor_partitions),
 };
 
-static struct platform_device physmap_flash_device = {
-	.name	= "physmap-flash",
+static struct platform_device imx6x_weimnor_device = {
+	.name	= "imx6x-weimnor",
 	.id	= 0,
 	.dev	= {
 		.platform_data = &nor_flash_data,
@@ -493,15 +494,45 @@ static void mx6q_setup_weimcs(void)
 	unsigned int reg;
 	void __iomem *nor_reg = MX6_IO_ADDRESS(WEIM_BASE_ADDR);
 	void __iomem *ccm_reg = MX6_IO_ADDRESS(CCM_BASE_ADDR);
+	struct clk *clk;
+	u32 rate;
 
-	/*CCM_BASE_ADDR + CLKCTL_CCGR6*/
+	/* CLKCTL_CCGR6: Set emi_slow_clock to be on in all modes */
 	reg = readl(ccm_reg + 0x80);
 	reg |= 0x00000C00;
 	writel(reg, ccm_reg + 0x80);
 
-	__raw_writel(0x00620081, nor_reg);
-	__raw_writel(0x1C022000, nor_reg + 0x00000008);
+	/* Timing settings below based upon datasheet for M29W256GL7AN6E
+	   These setting assume that the EIM_SLOW_CLOCK is set to 132 MHz */
+	clk = clk_get(NULL, "emi_slow_clk");
+	if (IS_ERR(clk))
+		printk(KERN_ERR "emi_slow_clk not found\n");
+
+	rate = clk_get_rate(clk);
+	if (rate != 132000000)
+		printk(KERN_ERR "Warning: emi_slow_clk not set to 132 MHz!"
+		       " WEIM NOR timing may be incorrect!\n");
+
+	/* EIM_CS0GCR1: 16-bit port on DATA[31:16],  Burst Length 8 words,
+	   Chip select enable is set */
+	__raw_writel(0x00020181, nor_reg);
+
+	/* EIM_CS0GCR2: Address hold time is set to cycle after ADV negation */
+	__raw_writel(0x00000001, nor_reg + 0x00000004);
+
+	/* EIM_CS0RCR1: RWSC = 9 EIM Clocks, ADV Negation = 2 EIM Clocks,
+	   OE Assertion = 2 EIM Clocks */
+	__raw_writel(0x0a022000, nor_reg + 0x00000008);
+
+	/* EIM_CS0RCR2: APR = Page read enabled, PAT = 4 EIM Clocks */
+	__raw_writel(0x0000c000, nor_reg + 0x0000000c);
+
+	/* EIM_CS0WCR1: WWSC = 8 EIM Clocks, WADVN = 1,  WBEA = 1, WBEN = 1,
+	   WEA = 1, WEN = 1  */
 	__raw_writel(0x0804a240, nor_reg + 0x00000010);
+
+	/* EIM_WCR: WDOG_EN = 1, INTPOL = 1  */
+	__raw_writel(0x00000120, nor_reg + 0x00000090);
 }
 
 static int max7310_1_setup(struct i2c_client *client,
@@ -1581,12 +1612,12 @@ static void __init mx6_board_init(void)
 	}
 	/* SPI */
 	imx6q_add_ecspi(0, &mx6q_sabreauto_spi_data);
-		if (spinor_en)
-			spi_device_init();
-		else if (weimnor_en) {
-			mx6q_setup_weimcs();
-			platform_device_register(&physmap_flash_device);
-		}
+	if (spinor_en)
+		spi_device_init();
+	else if (weimnor_en) {
+		mx6q_setup_weimcs();
+		platform_device_register(&imx6x_weimnor_device);
+	}
 	imx6q_add_mxc_hdmi(&hdmi_data);
 
 	imx6q_add_anatop_thermal_imx(1, &mx6q_sabreauto_anatop_thermal_data);