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Diffstat (limited to 'cpu/arm926ejs/kirkwood/mpp.c')
-rw-r--r--cpu/arm926ejs/kirkwood/mpp.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/cpu/arm926ejs/kirkwood/mpp.c b/cpu/arm926ejs/kirkwood/mpp.c
new file mode 100644
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+++ b/cpu/arm926ejs/kirkwood/mpp.c
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+/*
+ * arch/arm/mach-kirkwood/mpp.c
+ *
+ * MPP functions for Marvell Kirkwood SoCs
+ * Referenced from Linux kernel source
+ *
+ * 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 <common.h>
+#include <asm/arch/kirkwood.h>
+#include <asm/arch/mpp.h>
+
+static u32 kirkwood_variant(void)
+{
+ switch (readl(KW_REG_DEVICE_ID) & 0x03) {
+ case 1:
+ return MPP_F6192_MASK;
+ case 2:
+ return MPP_F6281_MASK;
+ default:
+ debug("MPP setup: unknown kirkwood variant\n");
+ return 0;
+ }
+}
+
+#define MPP_CTRL(i) (KW_MPP_BASE + (i* 4))
+#define MPP_NR_REGS (1 + MPP_MAX/8)
+
+void kirkwood_mpp_conf(u32 *mpp_list)
+{
+ u32 mpp_ctrl[MPP_NR_REGS];
+ unsigned int variant_mask;
+ int i;
+
+ variant_mask = kirkwood_variant();
+ if (!variant_mask)
+ return;
+
+ debug( "initial MPP regs:");
+ for (i = 0; i < MPP_NR_REGS; i++) {
+ mpp_ctrl[i] = readl(MPP_CTRL(i));
+ debug(" %08x", mpp_ctrl[i]);
+ }
+ debug("\n");
+
+
+ while (*mpp_list) {
+ unsigned int num = MPP_NUM(*mpp_list);
+ unsigned int sel = MPP_SEL(*mpp_list);
+ int shift;
+
+ if (num > MPP_MAX) {
+ debug("kirkwood_mpp_conf: invalid MPP "
+ "number (%u)\n", num);
+ continue;
+ }
+ if (!(*mpp_list & variant_mask)) {
+ debug("kirkwood_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;
+
+ mpp_list++;
+ }
+
+ debug(" final MPP regs:");
+ for (i = 0; i < MPP_NR_REGS; i++) {
+ writel(mpp_ctrl[i], MPP_CTRL(i));
+ debug(" %08x", mpp_ctrl[i]);
+ }
+ debug("\n");
+
+}