[ARM] Orion: rework MPP handling

Instead of having board code poke directly into the MPP configuration
registers, and separately calling orion5x_gpio_set_valid_pins() to
indicate which MPP pins can be used as GPIO pins, introduce a helper
function for configuring the roles of each of the MPP pins, and have
that helper function handle gpio validity internally.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Sylver Bruneau <sylver.bruneau@googlemail.com>
Acked-by: Russell King <linux@arm.linux.org.uk>

1 files changed, 163 insertions, 0 deletions

diff --git a/arch/arm/mach-orion5x/mpp.c b/arch/arm/mach-orion5x/mpp.c
new file mode 100644
index 000000000000..a48cadb01590
--- /dev/null
+++ b/arch/arm/mach-orion5x/mpp.c
@@ -0,0 +1,163 @@
+/*
+ * arch/arm/mach-orion5x/mpp.c
+ *
+ * MPP functions for Marvell Orion 5x SoCs
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mbus.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include "common.h"
+#include "mpp.h"
+
+static int is_5181l(void)
+{
+	u32 dev;
+	u32 rev;
+
+	orion5x_pcie_id(&dev, &rev);
+
+	return !!(dev == MV88F5181_DEV_ID && rev >= MV88F5181L_REV_A0);
+}
+
+static int is_5182(void)
+{
+	u32 dev;
+	u32 rev;
+
+	orion5x_pcie_id(&dev, &rev);
+
+	return !!(dev == MV88F5182_DEV_ID);
+}
+
+static int is_5281(void)
+{
+	u32 dev;
+	u32 rev;
+
+	orion5x_pcie_id(&dev, &rev);
+
+	return !!(dev == MV88F5281_DEV_ID);
+}
+
+static int __init determine_type_encoding(int mpp, enum orion5x_mpp_type type)
+{
+	switch (type) {
+	case MPP_UNUSED:
+	case MPP_GPIO:
+		if (mpp == 0)
+			return 3;
+		if (mpp >= 1 && mpp <= 15)
+			return 0;
+		if (mpp >= 16 && mpp <= 19) {
+			if (is_5182())
+				return 5;
+			if (type == MPP_UNUSED)
+				return 0;
+		}
+		return -1;
+
+	case MPP_PCIE_RST_OUTn:
+		if (mpp == 0)
+			return 0;
+		return -1;
+
+	case MPP_PCI_ARB:
+		if (mpp >= 0 && mpp <= 7)
+			return 2;
+		return -1;
+
+	case MPP_PCI_PMEn:
+		if (mpp == 2)
+			return 3;
+		return -1;
+
+	case MPP_GIGE:
+		if (mpp >= 8 && mpp <= 19)
+			return 1;
+		return -1;
+
+	case MPP_NAND:
+		if (is_5182() || is_5281()) {
+			if (mpp >= 4 && mpp <= 7)
+				return 4;
+			if (mpp >= 12 && mpp <= 17)
+				return 4;
+		}
+		return -1;
+
+	case MPP_PCI_CLK:
+		if (is_5181l() && mpp >= 6 && mpp <= 7)
+			return 5;
+		return -1;
+
+	case MPP_SATA_LED:
+		if (is_5182()) {
+			if (mpp >= 4 && mpp <= 7)
+				return 5;
+			if (mpp >= 12 && mpp <= 15)
+				return 5;
+		}
+		return -1;
+
+	case MPP_UART:
+		if (mpp >= 16 && mpp <= 19)
+			return 0;
+		return -1;
+	}
+
+	printk(KERN_INFO "unknown MPP type %d\n", type);
+
+	return -1;
+}
+
+void __init orion5x_mpp_conf(struct orion5x_mpp_mode *mode)
+{
+	u32 mpp_0_7_ctrl = readl(MPP_0_7_CTRL);
+	u32 mpp_8_15_ctrl = readl(MPP_8_15_CTRL);
+	u32 mpp_16_19_ctrl = readl(MPP_16_19_CTRL);
+
+	while (mode->mpp >= 0) {
+		u32 *reg;
+		int num_type;
+		int shift;
+
+		if (mode->mpp >= 0 && mode->mpp <= 7)
+			reg = &mpp_0_7_ctrl;
+		else if (mode->mpp >= 8 && mode->mpp <= 15)
+			reg = &mpp_8_15_ctrl;
+		else if (mode->mpp >= 16 && mode->mpp <= 19)
+			reg = &mpp_16_19_ctrl;
+		else {
+			printk(KERN_ERR "orion5x_mpp_conf: invalid MPP "
+					"(%d)\n", mode->mpp);
+			continue;
+		}
+
+		num_type = determine_type_encoding(mode->mpp, mode->type);
+		if (num_type < 0) {
+			printk(KERN_ERR "orion5x_mpp_conf: invalid MPP "
+					"combination (%d, %d)\n", mode->mpp,
+					mode->type);
+			continue;
+		}
+
+		shift = (mode->mpp & 7) << 2;
+		*reg &= ~(0xf << shift);
+		*reg |= (num_type & 0xf) << shift;
+
+		orion5x_gpio_set_valid(mode->mpp, !!(mode->type == MPP_GPIO));
+
+		mode++;
+	}
+
+	writel(mpp_0_7_ctrl, MPP_0_7_CTRL);
+	writel(mpp_8_15_ctrl, MPP_8_15_CTRL);
+	writel(mpp_16_19_ctrl, MPP_16_19_CTRL);
+}