ARM: orion: Refactor the MPP code common in the orion platform

[pandora-kernel.git] / arch / arm / plat-orion / mpp.c

diff --git a/arch/arm/plat-orion/mpp.c b/arch/arm/plat-orion/mpp.c
new file mode 100644 (file)
index 0000000..248c022
--- /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");
+}