1 files changed, 69 insertions, 0 deletions

diff --git a/arch/powerpc/boot/mpc52xx-psc.c b/arch/powerpc/boot/mpc52xx-psc.c
new file mode 100644
index 000000000000..1074626e6a37
--- /dev/null
+++ b/arch/powerpc/boot/mpc52xx-psc.c
@@ -0,0 +1,69 @@
+/*
+ * MPC5200 PSC serial console support.
+ *
+ * Author: Grant Likely <grant.likely@secretlab.ca>
+ *
+ * Copyright (c) 2007 Secret Lab Technologies Ltd.
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ *
+ * It is assumed that the firmware (or the platform file) has already set
+ * up the port.
+ */
+
+#include "types.h"
+#include "io.h"
+#include "ops.h"
+
+/* Programmable Serial Controller (PSC) status register bits */
+#define MPC52xx_PSC_SR          0x04
+#define MPC52xx_PSC_SR_RXRDY            0x0100
+#define MPC52xx_PSC_SR_RXFULL           0x0200
+#define MPC52xx_PSC_SR_TXRDY            0x0400
+#define MPC52xx_PSC_SR_TXEMP            0x0800
+
+#define MPC52xx_PSC_BUFFER      0x0C
+
+static void *psc;
+
+static int psc_open(void)
+{
+        /* Assume the firmware has already configured the PSC into
+         * uart mode */
+        return 0;
+}
+
+static void psc_putc(unsigned char c)
+{
+        while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_TXRDY)) ;
+        out_8(psc + MPC52xx_PSC_BUFFER, c);
+}
+
+static unsigned char psc_tstc(void)
+{
+        return (in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY) != 0;
+}
+
+static unsigned char psc_getc(void)
+{
+        while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY)) ;
+        return in_8(psc + MPC52xx_PSC_BUFFER);
+}
+
+int mpc5200_psc_console_init(void *devp, struct serial_console_data *scdp)
+{
+        int n;
+
+        /* Get the base address of the psc registers */
+        n = getprop(devp, "virtual-reg", &psc, sizeof(psc));
+        if (n != sizeof(psc)) {
+                if (!dt_xlate_reg(devp, 0, (void *)&psc, NULL))
+                        return -1;
+        }
+
+        scdp->open = psc_open;
+        scdp->putc = psc_putc;
+        scdp->getc = psc_getc;
+        scdp->tstc = psc_tstc;
+
+        return 0;
+}