arm: Kirkwood: Basic SOCs support

Kirkwood family controllers are highly integrated SOCs
based on Feroceon-88FR131/Sheeva-88SV131/arm926ejs cpu core.

SOC versions supported:-
1) 88F6281-A0       define CONFIG_KW88F6281_A0
2) 88F6192-A0       define CONFIG_KW88F6192_A0

Other supported features:-
1) get_random_hex() fucntion
2) PCI Express port initialization
3) NS16550 driver support

Contributors:
Yotam Admon <yotam@marvell.com>
Michael Blostein <michaelbl@marvell.com

Reviewed-by: Ronen Shitrit <rshitrit@marvell.com>
Acked-by: Stefan Rose <sr@denx.de>
Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>

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
index 00000000000..b2f0ad55e3c
--- /dev/null
+++ b/cpu/arm926ejs/kirkwood/mpp.c
@@ -0,0 +1,80 @@
+/*
+ * 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");
+
+}