3 files changed, 116 insertions, 1 deletions

diff --git a/arch/arm/plat-orion/Makefile b/arch/arm/plat-orion/Makefile
index 0f048c58b4c9..95a5fc53b6db 100644
--- a/arch/arm/plat-orion/Makefile
+++ b/arch/arm/plat-orion/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-obj-y   := irq.o pcie.o time.o common.o
+obj-y   := irq.o pcie.o time.o common.o mpp.o
 obj-m   :=
 obj-n   :=
 obj-    :=
diff --git a/arch/arm/plat-orion/include/plat/mpp.h b/arch/arm/plat-orion/include/plat/mpp.h
new file mode 100644
index 000000000000..723adce99f41
--- /dev/null
+++ b/arch/arm/plat-orion/include/plat/mpp.h
@@ -0,0 +1,34 @@
+/*
+ * arch/arm/plat-orion/include/plat/mpp.h
+ *
+ * Marvell Orion SoC MPP handling.
+ *
+ * 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.
+ */
+
+#ifndef __PLAT_MPP_H
+#define __PLAT_MPP_H
+
+#define MPP_NUM(x)      ((x) & 0xff)
+#define MPP_SEL(x)      (((x) >> 8) & 0xf)
+
+/* This is the generic MPP macro, without any variant information.
+   Each machine architecture is expected to extend this with further
+   bit fields indicating which MPP configurations are valid for a
+   specific variant. */
+
+#define GENERIC_MPP(_num, _sel, _in, _out) ( \
+        /* MPP number */                ((_num) & 0xff) | \
+        /* MPP select value */          (((_sel) & 0xf) << 8) | \
+        /* may be input signal */       ((!!(_in)) << 12) | \
+        /* may be output signal */      ((!!(_out)) << 13))
+
+#define MPP_INPUT_MASK          GENERIC_MPP(0, 0x0, 1, 0)
+#define MPP_OUTPUT_MASK         GENERIC_MPP(0, 0x0, 0, 1)
+
+void __init orion_mpp_conf(unsigned int *mpp_list, unsigned int variant_mask,
+                           unsigned int mpp_max, unsigned int dev_bus);
+
+#endif
diff --git a/arch/arm/plat-orion/mpp.c b/arch/arm/plat-orion/mpp.c
new file mode 100644
index 000000000000..248c02205b66
--- /dev/null
+++ b/arch/arm/plat-orion/mpp.c
@@ -0,0 +1,81 @@
+/*
+ * arch/arm/plat-orion/mpp.c
+ *
+ * MPP functions for Marvell orion 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 <linux/io.h>
+#include <linux/gpio.h>
+#include <mach/hardware.h>
+#include <plat/mpp.h>
+
+/* Address of the ith MPP control register */
+static __init unsigned long mpp_ctrl_addr(unsigned int i,
+                                          unsigned long dev_bus)
+{
+        return dev_bus + (i) * 4;
+}
+
+
+void __init orion_mpp_conf(unsigned int *mpp_list, unsigned int variant_mask,
+                           unsigned int mpp_max, unsigned int dev_bus)
+{
+        unsigned int mpp_nr_regs = (1 + mpp_max/8);
+        u32 mpp_ctrl[mpp_nr_regs];
+        int i;
+
+        if (!variant_mask)
+                return;
+
+        printk(KERN_DEBUG "initial MPP regs:");
+        for (i = 0; i < mpp_nr_regs; i++) {
+                mpp_ctrl[i] = readl(mpp_ctrl_addr(i, dev_bus));
+                printk(" %08x", mpp_ctrl[i]);
+        }
+        printk("\n");
+
+        for ( ; *mpp_list; mpp_list++) {
+                unsigned int num = MPP_NUM(*mpp_list);
+                unsigned int sel = MPP_SEL(*mpp_list);
+                int shift, gpio_mode;
+
+                if (num > mpp_max) {
+                        printk(KERN_ERR "orion_mpp_conf: invalid MPP "
+                                        "number (%u)\n", num);
+                        continue;
+                }
+                if (!(*mpp_list & variant_mask)) {
+                        printk(KERN_WARNING
+                               "orion_mpp_conf: requested MPP%u config "
+                               "unavailable on this hardware\n", num);
+                        continue;
+                }
+
+                shift = (num & 7) << 2;
+                mpp_ctrl[num / 8] &= ~(0xf << shift);
+                mpp_ctrl[num / 8] |= sel << shift;
+
+                gpio_mode = 0;
+                if (*mpp_list & MPP_INPUT_MASK)
+                        gpio_mode |= GPIO_INPUT_OK;
+                if (*mpp_list & MPP_OUTPUT_MASK)
+                        gpio_mode |= GPIO_OUTPUT_OK;
+                if (sel != 0)
+                        gpio_mode = 0;
+                orion_gpio_set_valid(num, gpio_mode);
+        }
+
+        printk(KERN_DEBUG "  final MPP regs:");
+        for (i = 0; i < mpp_nr_regs; i++) {
+                writel(mpp_ctrl[i], mpp_ctrl_addr(i, dev_bus));
+                printk(" %08x", mpp_ctrl[i]);
+        }
+        printk("\n");
+}