Merge git://www.denx.de/git/u-boot

1 files changed, 197 insertions, 0 deletions

diff --git a/cpu/mpc512x/serial.c b/cpu/mpc512x/serial.c
new file mode 100644
index 0000000..200ff2c
--- /dev/null
+++ b/cpu/mpc512x/serial.c
@@ -0,0 +1,197 @@
+/*
+ * (C) Copyright 2000 - 2007
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ * Based ont the MPC5200 PSC driver.
+ * Adapted for MPC512x by Jan Wrobel <wrr@semihalf.com>
+ */
+
+/*
+ * Minimal serial functions needed to use one of the PSC ports
+ * as serial console interface.
+ */
+
+#include <common.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if defined(CONFIG_PSC_CONSOLE)
+
+static void fifo_init (volatile psc512x_t *psc)
+{
+	volatile immap_t *im = (immap_t *) CFG_IMMR;
+
+	/* reset Rx & Tx fifo slice */
+	psc->rfcmd = PSC_FIFO_RESET_SLICE;
+	psc->tfcmd = PSC_FIFO_RESET_SLICE;
+
+	/* disable Tx & Rx FIFO interrupts */
+	psc->rfintmask = 0;
+	psc->tfintmask = 0;
+
+	psc->tfsize = CONSOLE_FIFO_TX_SIZE | (CONSOLE_FIFO_TX_ADDR << 16);
+	psc->rfsize = CONSOLE_FIFO_RX_SIZE | (CONSOLE_FIFO_RX_ADDR << 16);
+
+	/* enable Tx & Rx FIFO slice */
+	psc->rfcmd = PSC_FIFO_ENABLE_SLICE;
+	psc->tfcmd = PSC_FIFO_ENABLE_SLICE;
+
+	im->fifoc.fifoc_cmd = FIFOC_DISABLE_CLOCK_GATE;
+	__asm__ volatile ("sync");
+}
+
+int serial_init(void)
+{
+	volatile immap_t *im = (immap_t *) CFG_IMMR;
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+	unsigned long baseclk;
+	int div;
+
+	fifo_init (psc);
+
+	/* set MR register to point to MR1 */
+	psc->command = PSC_SEL_MODE_REG_1;
+
+	/* disable Tx/Rx */
+	psc->command = PSC_TX_DISABLE | PSC_RX_DISABLE;
+
+	/* choose the prescaler	by 16 for the Tx/Rx clock generation */
+	psc->psc_clock_select =  0xdd00;
+
+	/* switch to UART mode */
+	psc->sicr = 0;
+
+	/* mode register points to mr1 */
+	/* configure parity, bit length and so on in mode register 1*/
+	psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
+	/* now, mode register points to mr2 */
+	psc->mode = PSC_MODE_1_STOPBIT;
+
+	/* calculate dividor for setting PSC CTUR and CTLR registers */
+	baseclk = (gd->ipb_clk + 8) / 16;
+	div = (baseclk + (gd->baudrate / 2)) / gd->baudrate;
+
+	psc->ctur = (div >> 8) & 0xff;
+	/* set baudrate */
+	psc->ctlr = div & 0xff;
+
+	/* disable all interrupts */
+	psc->psc_imr = 0;
+
+	/* reset and enable Rx/Tx */
+	psc->command = PSC_RST_RX;
+	psc->command = PSC_RST_TX;
+	psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;
+
+	return 0;
+}
+
+void serial_putc (const char c)
+{
+	volatile immap_t *im = (immap_t *)CFG_IMMR;
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+
+	if (c == '\n')
+		serial_putc ('\r');
+
+	/* Wait for last character to go. */
+	while (!(psc->psc_status & PSC_SR_TXEMP))
+		;
+
+	psc->tfdata_8 = c;
+}
+
+void serial_putc_raw (const char c)
+{
+	volatile immap_t *im = (immap_t *) CFG_IMMR;
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+
+	/* Wait for last character to go. */
+	while (!(psc->psc_status & PSC_SR_TXEMP))
+		;
+
+	psc->tfdata_8 = c;
+}
+
+
+void serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}
+
+int serial_getc (void)
+{
+	volatile immap_t *im = (immap_t *) CFG_IMMR;
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+
+	/* Wait for a character to arrive. */
+	while (psc->rfstat & PSC_FIFO_EMPTY)
+		;
+
+	return psc->rfdata_8;
+}
+
+int serial_tstc (void)
+{
+	volatile immap_t *im = (immap_t *) CFG_IMMR;
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+
+	return !(psc->rfstat & PSC_FIFO_EMPTY);
+}
+
+void serial_setbrg (void)
+{
+	volatile immap_t *im = (immap_t *) CFG_IMMR;
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+	unsigned long baseclk, div;
+
+	baseclk = (gd->csb_clk + 8) / 16;
+	div = (baseclk + (gd->baudrate / 2)) / gd->baudrate;
+
+	psc->ctur = (div >> 8) & 0xFF;
+	psc->ctlr =  div & 0xff; /* set baudrate */
+}
+
+void serial_setrts(int s)
+{
+	volatile immap_t *im = (immap_t *) CFG_IMMR;
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+
+	if (s) {
+		/* Assert RTS (become LOW) */
+		psc->op1 = 0x1;
+	}
+	else {
+		/* Negate RTS (become HIGH) */
+		psc->op0 = 0x1;
+	}
+}
+
+int serial_getcts(void)
+{
+	volatile immap_t *im = (immap_t *) CFG_IMMR;
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+
+	return (psc->ip & 0x1) ? 0 : 1;
+}
+#endif /* CONFIG_PSC_CONSOLE */