This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / powerpc / boot / ns16550.c

diff --git a/arch/powerpc/boot/ns16550.c b/arch/powerpc/boot/ns16550.c
new file mode 100644 (file)
index 0000000..1ffe72e
--- /dev/null
+++ b/arch/powerpc/boot/ns16550.c
@@ -0,0 +1,74 @@
+/*
+ * 16550 serial console support.
+ *
+ * Original copied from <file:arch/ppc/boot/common/ns16550.c>
+ * (which had no copyright)
+ * Modifications: 2006 (c) MontaVista Software, Inc.
+ *
+ * Modified by: Mark A. Greer <mgreer@mvista.com>
+ */
+#include <stdarg.h>
+#include <stddef.h>
+#include "types.h"
+#include "string.h"
+#include "stdio.h"
+#include "io.h"
+#include "ops.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_LCR       3       /* Out: Line Control Register */
+#define UART_MCR       4       /* Out: Modem Control Register */
+#define UART_LSR       5       /* In:  Line Status Register */
+#define UART_LSR_THRE  0x20    /* Transmit-hold-register empty */
+#define UART_LSR_DR    0x01    /* Receiver data ready */
+#define UART_MSR       6       /* In:  Modem Status Register */
+#define UART_SCR       7       /* I/O: Scratch Register */
+
+static unsigned char *reg_base;
+static u32 reg_shift;
+
+static int ns16550_open(void)
+{
+       out_8(reg_base + (UART_FCR << reg_shift), 0x06);
+       return 0;
+}
+
+static void ns16550_putc(unsigned char c)
+{
+       while ((in_8(reg_base + (UART_LSR << reg_shift)) & UART_LSR_THRE) == 0);
+       out_8(reg_base, c);
+}
+
+static unsigned char ns16550_getc(void)
+{
+       while ((in_8(reg_base + (UART_LSR << reg_shift)) & UART_LSR_DR) == 0);
+       return in_8(reg_base);
+}
+
+static u8 ns16550_tstc(void)
+{
+       return ((in_8(reg_base + (UART_LSR << reg_shift)) & UART_LSR_DR) != 0);
+}
+
+int ns16550_console_init(void *devp, struct serial_console_data *scdp)
+{
+       int n;
+
+       n = getprop(devp, "virtual-reg", &reg_base, sizeof(reg_base));
+       if (n != sizeof(reg_base))
+               return -1;
+
+       n = getprop(devp, "reg-shift", &reg_shift, sizeof(reg_shift));
+       if (n != sizeof(reg_shift))
+               reg_shift = 0;
+
+       scdp->open = ns16550_open;
+       scdp->putc = ns16550_putc;
+       scdp->getc = ns16550_getc;
+       scdp->tstc = ns16550_tstc;
+       scdp->close = NULL;
+
+       return 0;
+}