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Diffstat (limited to 'arch/arm/plat-orion/mpp.c')
-rw-r--r--arch/arm/plat-orion/mpp.c81
1 files changed, 81 insertions, 0 deletions
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");
+}