2 * (C) Copyright 2000 - 2010
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.
33 #include <linux/compiler.h>
35 #include <asm/processor.h>
38 DECLARE_GLOBAL_DATA_PTR;
40 #if defined(CONFIG_PSC_CONSOLE) || defined(CONFIG_SERIAL_MULTI)
42 static void fifo_init (volatile psc512x_t *psc)
44 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
47 /* reset Rx & Tx fifo slice */
48 out_be32(&psc->rfcmd, PSC_FIFO_RESET_SLICE);
49 out_be32(&psc->tfcmd, PSC_FIFO_RESET_SLICE);
51 /* disable Tx & Rx FIFO interrupts */
52 out_be32(&psc->rfintmask, 0);
53 out_be32(&psc->tfintmask, 0);
55 #if defined(CONFIG_SERIAL_MULTI)
56 switch (((u32)psc & 0xf00) >> 8) {
58 tfsize = FIFOC_PSC0_TX_SIZE | (FIFOC_PSC0_TX_ADDR << 16);
59 rfsize = FIFOC_PSC0_RX_SIZE | (FIFOC_PSC0_RX_ADDR << 16);
62 tfsize = FIFOC_PSC1_TX_SIZE | (FIFOC_PSC1_TX_ADDR << 16);
63 rfsize = FIFOC_PSC1_RX_SIZE | (FIFOC_PSC1_RX_ADDR << 16);
66 tfsize = FIFOC_PSC2_TX_SIZE | (FIFOC_PSC2_TX_ADDR << 16);
67 rfsize = FIFOC_PSC2_RX_SIZE | (FIFOC_PSC2_RX_ADDR << 16);
70 tfsize = FIFOC_PSC3_TX_SIZE | (FIFOC_PSC3_TX_ADDR << 16);
71 rfsize = FIFOC_PSC3_RX_SIZE | (FIFOC_PSC3_RX_ADDR << 16);
74 tfsize = FIFOC_PSC4_TX_SIZE | (FIFOC_PSC4_TX_ADDR << 16);
75 rfsize = FIFOC_PSC4_RX_SIZE | (FIFOC_PSC4_RX_ADDR << 16);
78 tfsize = FIFOC_PSC5_TX_SIZE | (FIFOC_PSC5_TX_ADDR << 16);
79 rfsize = FIFOC_PSC5_RX_SIZE | (FIFOC_PSC5_RX_ADDR << 16);
82 tfsize = FIFOC_PSC6_TX_SIZE | (FIFOC_PSC6_TX_ADDR << 16);
83 rfsize = FIFOC_PSC6_RX_SIZE | (FIFOC_PSC6_RX_ADDR << 16);
86 tfsize = FIFOC_PSC7_TX_SIZE | (FIFOC_PSC7_TX_ADDR << 16);
87 rfsize = FIFOC_PSC7_RX_SIZE | (FIFOC_PSC7_RX_ADDR << 16);
90 tfsize = FIFOC_PSC8_TX_SIZE | (FIFOC_PSC8_TX_ADDR << 16);
91 rfsize = FIFOC_PSC8_RX_SIZE | (FIFOC_PSC8_RX_ADDR << 16);
94 tfsize = FIFOC_PSC9_TX_SIZE | (FIFOC_PSC9_TX_ADDR << 16);
95 rfsize = FIFOC_PSC9_RX_SIZE | (FIFOC_PSC9_RX_ADDR << 16);
98 tfsize = FIFOC_PSC10_TX_SIZE | (FIFOC_PSC10_TX_ADDR << 16);
99 rfsize = FIFOC_PSC10_RX_SIZE | (FIFOC_PSC10_RX_ADDR << 16);
102 tfsize = FIFOC_PSC11_TX_SIZE | (FIFOC_PSC11_TX_ADDR << 16);
103 rfsize = FIFOC_PSC11_RX_SIZE | (FIFOC_PSC11_RX_ADDR << 16);
109 tfsize = CONSOLE_FIFO_TX_SIZE | (CONSOLE_FIFO_TX_ADDR << 16);
110 rfsize = CONSOLE_FIFO_RX_SIZE | (CONSOLE_FIFO_RX_ADDR << 16);
112 out_be32(&psc->tfsize, tfsize);
113 out_be32(&psc->rfsize, rfsize);
115 /* enable Tx & Rx FIFO slice */
116 out_be32(&psc->rfcmd, PSC_FIFO_ENABLE_SLICE);
117 out_be32(&psc->tfcmd, PSC_FIFO_ENABLE_SLICE);
119 out_be32(&im->fifoc.fifoc_cmd, FIFOC_DISABLE_CLOCK_GATE);
120 __asm__ volatile ("sync");
123 void serial_setbrg_dev(unsigned int idx)
125 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
126 volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
127 unsigned long baseclk, div;
128 unsigned long baudrate;
132 baudrate = gd->baudrate;
133 if (idx != CONFIG_PSC_CONSOLE) {
134 /* Allows setting baudrate for other serial devices
135 * on PSCx using environment. If not specified, use
136 * the same baudrate as for console.
138 sprintf(buf, "psc%d_baudrate", idx);
139 br_env = getenv(buf);
141 baudrate = simple_strtoul(br_env, NULL, 10);
143 debug("%s: idx %d, baudrate %d\n", __func__, idx, baudrate);
146 /* calculate divisor for setting PSC CTUR and CTLR registers */
147 baseclk = (gd->ips_clk + 8) / 16;
148 div = (baseclk + (baudrate / 2)) / baudrate;
150 out_8(&psc->ctur, (div >> 8) & 0xff);
151 out_8(&psc->ctlr, div & 0xff); /* set baudrate */
154 int serial_init_dev(unsigned int idx)
156 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
157 volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
158 #if defined(CONFIG_SERIAL_MULTI)
161 reg = in_be32(&im->clk.sccr[0]);
162 out_be32(&im->clk.sccr[0], reg | CLOCK_SCCR1_PSC_EN(idx));
167 /* set MR register to point to MR1 */
168 out_8(&psc->command, PSC_SEL_MODE_REG_1);
171 out_8(&psc->command, PSC_TX_DISABLE | PSC_RX_DISABLE);
173 /* choose the prescaler by 16 for the Tx/Rx clock generation */
174 out_be16(&psc->psc_clock_select, 0xdd00);
176 /* switch to UART mode */
177 out_be32(&psc->sicr, 0);
179 /* mode register points to mr1 */
180 /* configure parity, bit length and so on in mode register 1*/
181 out_8(&psc->mode, PSC_MODE_8_BITS | PSC_MODE_PARNONE);
182 /* now, mode register points to mr2 */
183 out_8(&psc->mode, PSC_MODE_1_STOPBIT);
186 serial_setbrg_dev(idx);
188 /* disable all interrupts */
189 out_be16(&psc->psc_imr, 0);
191 /* reset and enable Rx/Tx */
192 out_8(&psc->command, PSC_RST_RX);
193 out_8(&psc->command, PSC_RST_TX);
194 out_8(&psc->command, PSC_RX_ENABLE | PSC_TX_ENABLE);
199 int serial_uninit_dev(unsigned int idx)
201 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
202 volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
205 out_8(&psc->command, PSC_RX_DISABLE | PSC_TX_DISABLE);
206 reg = in_be32(&im->clk.sccr[0]);
207 reg &= ~CLOCK_SCCR1_PSC_EN(idx);
208 out_be32(&im->clk.sccr[0], reg);
213 void serial_putc_dev(unsigned int idx, const char c)
215 volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
216 volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
219 serial_putc_dev(idx, '\r');
221 /* Wait for last character to go. */
222 while (!(in_be16(&psc->psc_status) & PSC_SR_TXEMP))
225 out_8(&psc->tfdata_8, c);
228 void serial_putc_raw_dev(unsigned int idx, const char c)
230 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
231 volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
233 /* Wait for last character to go. */
234 while (!(in_be16(&psc->psc_status) & PSC_SR_TXEMP))
237 out_8(&psc->tfdata_8, c);
240 void serial_puts_dev(unsigned int idx, const char *s)
243 serial_putc_dev(idx, *s++);
246 int serial_getc_dev(unsigned int idx)
248 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
249 volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
251 /* Wait for a character to arrive. */
252 while (in_be32(&psc->rfstat) & PSC_FIFO_EMPTY)
255 return in_8(&psc->rfdata_8);
258 int serial_tstc_dev(unsigned int idx)
260 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
261 volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
263 return !(in_be32(&psc->rfstat) & PSC_FIFO_EMPTY);
266 void serial_setrts_dev(unsigned int idx, int s)
268 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
269 volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
272 /* Assert RTS (become LOW) */
273 out_8(&psc->op1, 0x1);
276 /* Negate RTS (become HIGH) */
277 out_8(&psc->op0, 0x1);
281 int serial_getcts_dev(unsigned int idx)
283 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
284 volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
286 return (in_8(&psc->ip) & 0x1) ? 0 : 1;
288 #endif /* CONFIG_PSC_CONSOLE || CONFIG_SERIAL_MULTI */
290 #if defined(CONFIG_SERIAL_MULTI)
292 #define DECLARE_PSC_SERIAL_FUNCTIONS(port) \
293 int serial##port##_init(void) \
295 return serial_init_dev(port); \
297 int serial##port##_uninit(void) \
299 return serial_uninit_dev(port); \
301 void serial##port##_setbrg(void) \
303 serial_setbrg_dev(port); \
305 int serial##port##_getc(void) \
307 return serial_getc_dev(port); \
309 int serial##port##_tstc(void) \
311 return serial_tstc_dev(port); \
313 void serial##port##_putc(const char c) \
315 serial_putc_dev(port, c); \
317 void serial##port##_puts(const char *s) \
319 serial_puts_dev(port, s); \
322 #define INIT_PSC_SERIAL_STRUCTURE(port, name) { \
324 serial##port##_init, \
325 serial##port##_uninit, \
326 serial##port##_setbrg, \
327 serial##port##_getc, \
328 serial##port##_tstc, \
329 serial##port##_putc, \
330 serial##port##_puts, \
333 #if defined(CONFIG_SYS_PSC1)
334 DECLARE_PSC_SERIAL_FUNCTIONS(1);
335 struct serial_device serial1_device =
336 INIT_PSC_SERIAL_STRUCTURE(1, "psc1");
339 #if defined(CONFIG_SYS_PSC3)
340 DECLARE_PSC_SERIAL_FUNCTIONS(3);
341 struct serial_device serial3_device =
342 INIT_PSC_SERIAL_STRUCTURE(3, "psc3");
345 #if defined(CONFIG_SYS_PSC4)
346 DECLARE_PSC_SERIAL_FUNCTIONS(4);
347 struct serial_device serial4_device =
348 INIT_PSC_SERIAL_STRUCTURE(4, "psc4");
351 #if defined(CONFIG_SYS_PSC6)
352 DECLARE_PSC_SERIAL_FUNCTIONS(6);
353 struct serial_device serial6_device =
354 INIT_PSC_SERIAL_STRUCTURE(6, "psc6");
357 __weak struct serial_device *default_serial_console(void)
359 #if (CONFIG_PSC_CONSOLE == 3)
360 return &serial3_device;
361 #elif (CONFIG_PSC_CONSOLE == 6)
362 return &serial6_device;
364 #error "invalid CONFIG_PSC_CONSOLE"
370 void serial_setbrg(void)
372 serial_setbrg_dev(CONFIG_PSC_CONSOLE);
375 int serial_init(void)
377 return serial_init_dev(CONFIG_PSC_CONSOLE);
380 void serial_putc(const char c)
382 serial_putc_dev(CONFIG_PSC_CONSOLE, c);
385 void serial_putc_raw(const char c)
387 serial_putc_raw_dev(CONFIG_PSC_CONSOLE, c);
390 void serial_puts(const char *s)
392 serial_puts_dev(CONFIG_PSC_CONSOLE, s);
395 int serial_getc(void)
397 return serial_getc_dev(CONFIG_PSC_CONSOLE);
400 int serial_tstc(void)
402 return serial_tstc_dev(CONFIG_PSC_CONSOLE);
405 void serial_setrts(int s)
407 return serial_setrts_dev(CONFIG_PSC_CONSOLE, s);
410 int serial_getcts(void)
412 return serial_getcts_dev(CONFIG_PSC_CONSOLE);
414 #endif /* CONFIG_PSC_CONSOLE */
416 #if defined(CONFIG_SERIAL_MULTI)
417 #include <stdio_dev.h>
419 * Routines for communication with serial devices over PSC
421 /* Bitfield for initialized PSCs */
422 static unsigned int initialized;
424 struct stdio_dev *open_port(int num, int baudrate)
426 struct stdio_dev *port;
431 if (num < 0 || num > 11)
434 sprintf(name, "psc%d", num);
435 port = stdio_get_by_name(name);
439 if (!test_bit(num, &initialized)) {
440 sprintf(env_var, "psc%d_baudrate", num);
441 sprintf(env_val, "%d", baudrate);
442 setenv(env_var, env_val);
447 set_bit(num, &initialized);
453 int close_port(int num)
455 struct stdio_dev *port;
459 if (num < 0 || num > 11)
462 sprintf(name, "psc%d", num);
463 port = stdio_get_by_name(name);
468 clear_bit(num, &initialized);
473 int write_port(struct stdio_dev *port, char *buf)
483 int read_port(struct stdio_dev *port, char *buf, int size)
493 while (port->tstc()) {
494 buf[cnt++] = port->getc();
501 #endif /* CONFIG_SERIAL_MULTI */