1 files changed, 100 insertions, 0 deletions

diff --git a/arch/powerpc/boot/virtex.c b/arch/powerpc/boot/virtex.c
new file mode 100644
index 000000000000..f622805f8000
--- /dev/null
+++ b/arch/powerpc/boot/virtex.c
@@ -0,0 +1,100 @@
+/*
+ * The platform specific code for virtex devices since a boot loader is not
+ * always used.
+ *
+ * (C) Copyright 2008 Xilinx, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include "ops.h"
+#include "io.h"
+#include "stdio.h"
+
+#define UART_DLL                0       /* Out: Divisor Latch Low */
+#define UART_DLM                1       /* Out: Divisor Latch High */
+#define UART_FCR                2       /* Out: FIFO Control Register */
+#define UART_FCR_CLEAR_RCVR     0x02    /* Clear the RCVR FIFO */
+#define UART_FCR_CLEAR_XMIT     0x04    /* Clear the XMIT FIFO */
+#define UART_LCR                3       /* Out: Line Control Register */
+#define UART_MCR                4       /* Out: Modem Control Register */
+#define UART_MCR_RTS            0x02    /* RTS complement */
+#define UART_MCR_DTR            0x01    /* DTR complement */
+#define UART_LCR_DLAB           0x80    /* Divisor latch access bit */
+#define UART_LCR_WLEN8          0x03    /* Wordlength: 8 bits */
+
+static int virtex_ns16550_console_init(void *devp)
+{
+        unsigned char *reg_base;
+        u32 reg_shift, reg_offset, clk, spd;
+        u16 divisor;
+        int n;
+
+        if (dt_get_virtual_reg(devp, (void **)&reg_base, 1) < 1)
+                return -1;
+
+        n = getprop(devp, "reg-offset", &reg_offset, sizeof(reg_offset));
+        if (n == sizeof(reg_offset))
+                reg_base += reg_offset;
+
+        n = getprop(devp, "reg-shift", &reg_shift, sizeof(reg_shift));
+        if (n != sizeof(reg_shift))
+                reg_shift = 0;
+
+        n = getprop(devp, "current-speed", (void *)&spd, sizeof(spd));
+        if (n != sizeof(spd))
+                spd = 9600;
+
+        /* should there be a default clock rate?*/
+        n = getprop(devp, "clock-frequency", (void *)&clk, sizeof(clk));
+        if (n != sizeof(clk))
+                return -1;
+
+        divisor = clk / (16 * spd);
+
+        /* Access baud rate */
+        out_8(reg_base + (UART_LCR << reg_shift), UART_LCR_DLAB);
+
+        /* Baud rate based on input clock */
+        out_8(reg_base + (UART_DLL << reg_shift), divisor & 0xFF);
+        out_8(reg_base + (UART_DLM << reg_shift), divisor >> 8);
+
+        /* 8 data, 1 stop, no parity */
+        out_8(reg_base + (UART_LCR << reg_shift), UART_LCR_WLEN8);
+
+        /* RTS/DTR */
+        out_8(reg_base + (UART_MCR << reg_shift), UART_MCR_RTS | UART_MCR_DTR);
+
+        /* Clear transmitter and receiver */
+        out_8(reg_base + (UART_FCR << reg_shift),
+                                UART_FCR_CLEAR_XMIT | UART_FCR_CLEAR_RCVR);
+        return 0;
+}
+
+/* For virtex, the kernel may be loaded without using a bootloader and if so
+   some UARTs need more setup than is provided in the normal console init
+*/
+int platform_specific_init(void)
+{
+        void *devp;
+        char devtype[MAX_PROP_LEN];
+        char path[MAX_PATH_LEN];
+
+        devp = finddevice("/chosen");
+        if (devp == NULL)
+                return -1;
+
+        if (getprop(devp, "linux,stdout-path", path, MAX_PATH_LEN) > 0) {
+                devp = finddevice(path);
+                if (devp == NULL)
+                        return -1;
+
+                if ((getprop(devp, "device_type", devtype, sizeof(devtype)) > 0)
+                                && !strcmp(devtype, "serial")
+                                && (dt_is_compatible(devp, "ns16550")))
+                                virtex_ns16550_console_init(devp);
+        }
+        return 0;
+}