2 * (C) Copyright 2004, Freescale, Inc
3 * TsiChung Liew, Tsi-Chung.Liew@freescale.com.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 * Minimal serial functions needed to use one of the PSC ports
27 * as serial console interface.
33 DECLARE_GLOBAL_DATA_PTR;
35 #define PSC_BASE MMAP_PSC1
37 #if defined(CONFIG_PSC_CONSOLE)
38 int serial_init (void)
40 volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
43 /* write to SICR: SIM2 = uart mode,dcd does not affect rx */
48 /* write to CSR: RX/TX baud rate from timers */
49 psc->sr_csr = 0xdd000000;
51 psc->mr1_2 = PSC_MR1_BITS_CHAR_8 | PSC_MR1_NO_PARITY | PSC_MR2_STOP_BITS_1;
53 /* Setting up BaudRate */
54 counter = ((gd->bus_clk / gd->baudrate)) >> 5;
57 /* write to CTUR: divide counter upper byte */
58 psc->ctur = ((counter & 0xff00) << 16);
59 /* write to CTLR: divide counter lower byte */
60 psc->ctlr = ((counter & 0x00ff) << 24);
62 psc->cr = PSC_CR_RST_RX_CMD;
63 psc->cr = PSC_CR_RST_TX_CMD;
64 psc->cr = PSC_CR_RST_ERR_STS_CMD;
65 psc->cr = PSC_CR_RST_BRK_INT_CMD;
66 psc->cr = PSC_CR_RST_MR_PTR_CMD;
68 psc->cr = PSC_CR_RX_ENABLE | PSC_CR_TX_ENABLE;
72 void serial_putc (const char c)
74 volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
79 /* Wait for last character to go. */
80 while (!(psc->sr_csr & PSC_SR_TXRDY));
85 void serial_puts (const char *s)
92 int serial_getc (void)
94 volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
96 /* Wait for a character to arrive. */
97 while (!(psc->sr_csr & PSC_SR_RXRDY));
98 return psc->xmitbuf[2];
101 int serial_tstc (void)
103 volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
105 return (psc->sr_csr & PSC_SR_RXRDY);
108 void serial_setbrg (void)
110 volatile psc8220_t *psc = (psc8220_t *) PSC_BASE;
113 counter = ((gd->bus_clk / gd->baudrate)) >> 5;
116 /* write to CTUR: divide counter upper byte */
117 psc->ctur = ((counter & 0xff00) << 16);
118 /* write to CTLR: divide counter lower byte */
119 psc->ctlr = ((counter & 0x00ff) << 24);
121 psc->cr = PSC_CR_RST_RX_CMD;
122 psc->cr = PSC_CR_RST_TX_CMD;
124 psc->cr = PSC_CR_RX_ENABLE | PSC_CR_TX_ENABLE;
126 #endif /* CONFIG_PSC_CONSOLE */