memory: mvebu-devbus: add Orion5x support

This commit adds support for the Orion5x family of Marvell processors
into the mvebu-devbus driver. It differs from the already supported
Armada 370/XP by:

 * Having a single register (instead of two) for doing all the timing
   configuration.

 * Having a few less timing configuration parameters.

For this reason, a separate compatible string "marvell,orion-devbus"
is introduced.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Link: https://lkml.kernel.org/r/1398202002-28530-9-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 86 insertions, 21 deletions

diff --git a/drivers/memory/mvebu-devbus.c b/drivers/memory/mvebu-devbus.c
index 5dc9c63..c8f3dad 100644
--- a/drivers/memory/mvebu-devbus.c
+++ b/drivers/memory/mvebu-devbus.c
@@ -2,7 +2,7 @@
  * Marvell EBU SoC Device Bus Controller
  * (memory controller for NOR/NAND/SRAM/FPGA devices)
  *
- * Copyright (C) 2013 Marvell
+ * Copyright (C) 2013-2014 Marvell
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -44,6 +44,34 @@
 #define ARMADA_READ_PARAM_OFFSET	0x0
 #define ARMADA_WRITE_PARAM_OFFSET	0x4
 
+#define ORION_RESERVED			(0x2 << 30)
+#define ORION_BADR_SKEW_SHIFT		28
+#define ORION_WR_HIGH_EXT_BIT		BIT(27)
+#define ORION_WR_HIGH_EXT_MASK		0x8
+#define ORION_WR_LOW_EXT_BIT		BIT(26)
+#define ORION_WR_LOW_EXT_MASK		0x8
+#define ORION_ALE_WR_EXT_BIT		BIT(25)
+#define ORION_ALE_WR_EXT_MASK		0x8
+#define ORION_ACC_NEXT_EXT_BIT		BIT(24)
+#define ORION_ACC_NEXT_EXT_MASK		0x10
+#define ORION_ACC_FIRST_EXT_BIT		BIT(23)
+#define ORION_ACC_FIRST_EXT_MASK	0x10
+#define ORION_TURN_OFF_EXT_BIT		BIT(22)
+#define ORION_TURN_OFF_EXT_MASK		0x8
+#define ORION_DEV_WIDTH_SHIFT		20
+#define ORION_WR_HIGH_SHIFT		17
+#define ORION_WR_HIGH_MASK		0x7
+#define ORION_WR_LOW_SHIFT		14
+#define ORION_WR_LOW_MASK		0x7
+#define ORION_ALE_WR_SHIFT		11
+#define ORION_ALE_WR_MASK		0x7
+#define ORION_ACC_NEXT_SHIFT		7
+#define ORION_ACC_NEXT_MASK		0xF
+#define ORION_ACC_FIRST_SHIFT		3
+#define ORION_ACC_FIRST_MASK		0xF
+#define ORION_TURN_OFF_SHIFT		0
+#define ORION_TURN_OFF_MASK		0x7
+
 struct devbus_read_params {
 	u32 bus_width;
 	u32 badr_skew;
@@ -96,7 +124,6 @@ static int devbus_get_timing_params(struct devbus *devbus,
 {
 	int err;
 
-	/* Get read timings */
 	err = of_property_read_u32(node, "devbus,bus-width", &r->bus_width);
 	if (err < 0) {
 		dev_err(devbus->dev,
@@ -138,24 +165,25 @@ static int devbus_get_timing_params(struct devbus *devbus,
 	if (err < 0)
 		return err;
 
-	err = get_timing_param_ps(devbus, node, "devbus,rd-setup-ps",
-				 &r->rd_setup);
-	if (err < 0)
-		return err;
-
-	err = get_timing_param_ps(devbus, node, "devbus,rd-hold-ps",
-				 &r->rd_hold);
-	if (err < 0)
-		return err;
-
-	/* Get write timings */
-	err = of_property_read_u32(node, "devbus,sync-enable",
-				  &w->sync_enable);
-	if (err < 0) {
-		dev_err(devbus->dev,
-			"%s has no 'devbus,sync-enable' property\n",
-			node->full_name);
-		return err;
+	if (of_device_is_compatible(devbus->dev->of_node, "marvell,mvebu-devbus")) {
+		err = get_timing_param_ps(devbus, node, "devbus,rd-setup-ps",
+					  &r->rd_setup);
+		if (err < 0)
+			return err;
+
+		err = get_timing_param_ps(devbus, node, "devbus,rd-hold-ps",
+					  &r->rd_hold);
+		if (err < 0)
+			return err;
+
+		err = of_property_read_u32(node, "devbus,sync-enable",
+					   &w->sync_enable);
+		if (err < 0) {
+			dev_err(devbus->dev,
+				"%s has no 'devbus,sync-enable' property\n",
+				node->full_name);
+			return err;
+		}
 	}
 
 	err = get_timing_param_ps(devbus, node, "devbus,ale-wr-ps",
@@ -176,6 +204,39 @@ static int devbus_get_timing_params(struct devbus *devbus,
 	return 0;
 }
 
+static void devbus_orion_set_timing_params(struct devbus *devbus,
+					  struct device_node *node,
+					  struct devbus_read_params *r,
+					  struct devbus_write_params *w)
+{
+	u32 value;
+
+	/*
+	 * The hardware designers found it would be a good idea to
+	 * split most of the values in the register into two fields:
+	 * one containing all the low-order bits, and another one
+	 * containing just the high-order bit. For all of those
+	 * fields, we have to split the value into these two parts.
+	 */
+	value =	(r->turn_off   & ORION_TURN_OFF_MASK)  << ORION_TURN_OFF_SHIFT  |
+		(r->acc_first  & ORION_ACC_FIRST_MASK) << ORION_ACC_FIRST_SHIFT |
+		(r->acc_next   & ORION_ACC_NEXT_MASK)  << ORION_ACC_NEXT_SHIFT  |
+		(w->ale_wr     & ORION_ALE_WR_MASK)    << ORION_ALE_WR_SHIFT    |
+		(w->wr_low     & ORION_WR_LOW_MASK)    << ORION_WR_LOW_SHIFT    |
+		(w->wr_high    & ORION_WR_HIGH_MASK)   << ORION_WR_HIGH_SHIFT   |
+		r->bus_width                           << ORION_DEV_WIDTH_SHIFT |
+		((r->turn_off  & ORION_TURN_OFF_EXT_MASK)  ? ORION_TURN_OFF_EXT_BIT  : 0) |
+		((r->acc_first & ORION_ACC_FIRST_EXT_MASK) ? ORION_ACC_FIRST_EXT_BIT : 0) |
+		((r->acc_next  & ORION_ACC_NEXT_EXT_MASK)  ? ORION_ACC_NEXT_EXT_BIT  : 0) |
+		((w->ale_wr    & ORION_ALE_WR_EXT_MASK)    ? ORION_ALE_WR_EXT_BIT    : 0) |
+		((w->wr_low    & ORION_WR_LOW_EXT_MASK)    ? ORION_WR_LOW_EXT_BIT    : 0) |
+		((w->wr_high   & ORION_WR_HIGH_EXT_MASK)   ? ORION_WR_HIGH_EXT_BIT   : 0) |
+		(r->badr_skew << ORION_BADR_SKEW_SHIFT) |
+		ORION_RESERVED;
+
+	writel(value, devbus->base);
+}
+
 static void devbus_armada_set_timing_params(struct devbus *devbus,
 					   struct device_node *node,
 					   struct devbus_read_params *r,
@@ -255,7 +316,10 @@ static int mvebu_devbus_probe(struct platform_device *pdev)
 		return err;
 
 	/* Set the new timing parameters */
-	devbus_armada_set_timing_params(devbus, node, &r, &w);
+	if (of_device_is_compatible(node, "marvell,orion-devbus"))
+		devbus_orion_set_timing_params(devbus, node, &r, &w);
+	else
+		devbus_armada_set_timing_params(devbus, node, &r, &w);
 
 	/*
 	 * We need to create a child device explicitly from here to
@@ -271,6 +335,7 @@ static int mvebu_devbus_probe(struct platform_device *pdev)
 
 static const struct of_device_id mvebu_devbus_of_match[] = {
 	{ .compatible = "marvell,mvebu-devbus" },
+	{ .compatible = "marvell,orion-devbus" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, mvebu_devbus_of_match);