2 * (C) Copyright 2000 - 2009
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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,
23 * Based ont the MPC5200 PSC driver.
24 * Adapted for MPC512x by Jan Wrobel <wrr@semihalf.com>
28 * Minimal serial functions needed to use one of the PSC ports
29 * as serial console interface.
34 #include <asm/processor.h>
36 DECLARE_GLOBAL_DATA_PTR;
38 #if defined(CONFIG_PSC_CONSOLE)
40 static void fifo_init (volatile psc512x_t *psc)
42 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
44 /* reset Rx & Tx fifo slice */
45 out_be32(&psc->rfcmd, PSC_FIFO_RESET_SLICE);
46 out_be32(&psc->tfcmd, PSC_FIFO_RESET_SLICE);
48 /* disable Tx & Rx FIFO interrupts */
49 out_be32(&psc->rfintmask, 0);
50 out_be32(&psc->tfintmask, 0);
52 out_be32(&psc->tfsize, CONSOLE_FIFO_TX_SIZE | (CONSOLE_FIFO_TX_ADDR << 16));
53 out_be32(&psc->rfsize, CONSOLE_FIFO_RX_SIZE | (CONSOLE_FIFO_RX_ADDR << 16));
55 /* enable Tx & Rx FIFO slice */
56 out_be32(&psc->rfcmd, PSC_FIFO_ENABLE_SLICE);
57 out_be32(&psc->tfcmd, PSC_FIFO_ENABLE_SLICE);
59 out_be32(&im->fifoc.fifoc_cmd, FIFOC_DISABLE_CLOCK_GATE);
60 __asm__ volatile ("sync");
63 void serial_setbrg(void)
65 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
66 volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
67 unsigned long baseclk, div;
69 /* calculate dividor for setting PSC CTUR and CTLR registers */
70 baseclk = (gd->ips_clk + 8) / 16;
71 div = (baseclk + (gd->baudrate / 2)) / gd->baudrate;
73 out_8(&psc->ctur, (div >> 8) & 0xff);
74 out_8(&psc->ctlr, div & 0xff); /* set baudrate */
79 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
80 volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
84 /* set MR register to point to MR1 */
85 out_8(&psc->command, PSC_SEL_MODE_REG_1);
88 out_8(&psc->command, PSC_TX_DISABLE | PSC_RX_DISABLE);
90 /* choose the prescaler by 16 for the Tx/Rx clock generation */
91 out_be16(&psc->psc_clock_select, 0xdd00);
93 /* switch to UART mode */
94 out_be32(&psc->sicr, 0);
96 /* mode register points to mr1 */
97 /* configure parity, bit length and so on in mode register 1*/
98 out_8(&psc->mode, PSC_MODE_8_BITS | PSC_MODE_PARNONE);
99 /* now, mode register points to mr2 */
100 out_8(&psc->mode, PSC_MODE_1_STOPBIT);
105 /* disable all interrupts */
106 out_be16(&psc->psc_imr, 0);
108 /* reset and enable Rx/Tx */
109 out_8(&psc->command, PSC_RST_RX);
110 out_8(&psc->command, PSC_RST_TX);
111 out_8(&psc->command, PSC_RX_ENABLE | PSC_TX_ENABLE);
116 void serial_putc (const char c)
118 volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
119 volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
124 /* Wait for last character to go. */
125 while (!(in_be16(&psc->psc_status) & PSC_SR_TXEMP))
131 void serial_putc_raw (const char c)
133 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
134 volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
136 /* Wait for last character to go. */
137 while (!(in_be16(&psc->psc_status) & PSC_SR_TXEMP))
144 void serial_puts (const char *s)
151 int serial_getc (void)
153 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
154 volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
156 /* Wait for a character to arrive. */
157 while (in_be32(&psc->rfstat) & PSC_FIFO_EMPTY)
160 return psc->rfdata_8;
163 int serial_tstc (void)
165 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
166 volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
168 return !(in_be32(&psc->rfstat) & PSC_FIFO_EMPTY);
171 void serial_setrts(int s)
173 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
174 volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
177 /* Assert RTS (become LOW) */
178 out_8(&psc->op1, 0x1);
181 /* Negate RTS (become HIGH) */
182 out_8(&psc->op0, 0x1);
186 int serial_getcts(void)
188 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
189 volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
191 return (in_8(&psc->ip) & 0x1) ? 0 : 1;
193 #endif /* CONFIG_PSC_CONSOLE */