[PATCH] ARM: imx: Improve the soc revision calculation flow

[Bai Ping]

On our i.MX6 SOC, the DIGPROG register is used for representing the
SOC ID and silicon revision. The revision has two part: MAJOR and
MINOR. each is represented in 8 bits in the register.

bits [15:8]: reflect the MAJOR part of the revision;
bits [7:0]: reflect the MINOR part of the revision;

In our linux kernel, the soc revision is represented in 8 bits.
MAJOR part and MINOR each occupy 4 bits.

previous method does NOT take care about the MAJOR part in DIGPROG
register. So reformat the revision read from the HW to be compatible
with the revision format used in kernel.

Signed-off-by: Bai Ping <ping.bai at nxp.com>
---
 arch/arm/mach-imx/anatop.c | 58 +++++++++++++++++-----------------------------
 1 file changed, 21 insertions(+), 37 deletions(-)

diff --git a/arch/arm/mach-imx/anatop.c b/arch/arm/mach-imx/anatop.c
index 649a84c..170cb30 100644
--- a/arch/arm/mach-imx/anatop.c
+++ b/arch/arm/mach-imx/anatop.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2013-2015 Freescale Semiconductor, Inc.
+ * Copyright NXP 2017.
  *
  * The code contained herein is licensed under the GNU General Public
  * License. You may obtain a copy of the GNU General Public License
@@ -116,6 +117,8 @@ void __init imx_init_revision_from_anatop(void)
 	unsigned int revision;
 	u32 digprog;
 	u16 offset = ANADIG_DIGPROG;
+	u16 major_part, minor_part;
+
 
 	np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
 	anatop_base = of_iomap(np, 0);
@@ -127,45 +130,26 @@ void __init imx_init_revision_from_anatop(void)
 	digprog = readl_relaxed(anatop_base + offset);
 	iounmap(anatop_base);
 
-	switch (digprog & 0xff) {
-	case 0:
-		/*
-		 * For i.MX6QP, most of the code for i.MX6Q can be resued,
-		 * so internally, we identify it as i.MX6Q Rev 2.0
-		 */
-		if (digprog >> 8 & 0x01)
-			revision = IMX_CHIP_REVISION_2_0;
-		else
-			revision = IMX_CHIP_REVISION_1_0;
-		break;
-	case 1:
-		revision = IMX_CHIP_REVISION_1_1;
-		break;
-	case 2:
-		revision = IMX_CHIP_REVISION_1_2;
-		break;
-	case 3:
-		revision = IMX_CHIP_REVISION_1_3;
-		break;
-	case 4:
-		revision = IMX_CHIP_REVISION_1_4;
-		break;
-	case 5:
-		/*
-		 * i.MX6DQ TO1.5 is defined as Rev 1.3 in Data Sheet, marked
-		 * as 'D' in Part Number last character.
-		 */
-		revision = IMX_CHIP_REVISION_1_5;
-		break;
-	default:
-		/*
-		 * Fail back to return raw register value instead of 0xff.
-		 * It will be easy to know version information in SOC if it
-		 * can't be recognized by known version. And some chip's (i.MX7D)
-		 * digprog value match linux version format, so it needn't map
-		 * again and we can use register value directly.
+	/*
+	 * On i.MX7D digprog value match linux version format, so
+	 * it needn't map again and we can use register value directly.
+	 */
+	if (of_device_is_compatible(np, "fsl,imx7d-anatop")) {
+		revision = digprog & 0xff;
+	} else {
+
+		/* MAJOR: [15:8], the major silicon revison;
+		 * MINOR: [7: 0], the minor silicon revison;
+		 *
+		 * please refer to the i.MX RM for the detailed
+		 * silicon revison bit define.
+		 * format the major part and minor part to match the
+		 * linux kernel soc version format.
 		 */
 		revision = digprog & 0xff;
+		major_part = (digprog >> 8) & 0xf;
+		minor_part = digprog & 0xf;
+		revision = ((major_part + 1) << 4) | minor_part;
 	}
 
 	mxc_set_cpu_type(digprog >> 16 & 0xff);
-- 
1.9.1