aboutsummaryrefslogtreecommitdiffstats
path: root/arch/ppc/boot/simple/m8260_tty.c
blob: d770947e9b8fe186ab4fbea0c94426feb601772c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
/* Minimal serial functions needed to send messages out the serial
 * port on SMC1.
 */
#include <linux/types.h>
#include <asm/mpc8260.h>
#include <asm/cpm2.h>
#include <asm/immap_cpm2.h>

uint	no_print;
extern char	*params[];
extern int	nparams;
static		u_char	cons_hold[128], *sgptr;
static		int	cons_hold_cnt;

/* If defined, enables serial console.  The value (1 through 4)
 * should designate which SCC is used, but this isn't complete.  Only
 * SCC1 is known to work at this time.
 * We're only linked if SERIAL_CPM_CONSOLE=y, so we only need to test
 * SERIAL_CPM_SCC1.
 */
#ifdef CONFIG_SERIAL_CPM_SCC1
#define SCC_CONSOLE 1
#endif

unsigned long
serial_init(int ignored, bd_t *bd)
{
#ifdef SCC_CONSOLE
	volatile scc_t		*sccp;
	volatile scc_uart_t	*sup;
#else
	volatile smc_t		*sp;
	volatile smc_uart_t	*up;
#endif
	volatile cbd_t	*tbdf, *rbdf;
	volatile cpm2_map_t	*ip;
	volatile iop_cpm2_t	*io;
	volatile cpm_cpm2_t	*cp;
	uint	dpaddr, memaddr;

	ip = (cpm2_map_t *)CPM_MAP_ADDR;
	cp = &ip->im_cpm;
	io = &ip->im_ioport;

	/* Perform a reset.
	*/
	cp->cp_cpcr = (CPM_CR_RST | CPM_CR_FLG);

	/* Wait for it.
	*/
	while (cp->cp_cpcr & CPM_CR_FLG);

#ifdef CONFIG_ADS8260
	/* Enable the RS-232 transceivers.
	*/
	*(volatile uint *)(BCSR_ADDR + 4) &=
					~(BCSR1_RS232_EN1 | BCSR1_RS232_EN2);
#endif

#ifdef SCC_CONSOLE
	sccp = (scc_t *)&(ip->im_scc[SCC_CONSOLE-1]);
	sup = (scc_uart_t *)&ip->im_dprambase[PROFF_SCC1 + ((SCC_CONSOLE-1) << 8)];
	sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
	sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);

	/* Use Port D for SCC1 instead of other functions.
	*/
	io->iop_ppard |= 0x00000003;
	io->iop_psord &= ~0x00000001;	/* Rx */
	io->iop_psord |= 0x00000002;	/* Tx */
	io->iop_pdird &= ~0x00000001;	/* Rx */
	io->iop_pdird |= 0x00000002;	/* Tx */

#else
	sp = (smc_t*)&(ip->im_smc[0]);
	*(ushort *)(&ip->im_dprambase[PROFF_SMC1_BASE]) = PROFF_SMC1;
	up = (smc_uart_t *)&ip->im_dprambase[PROFF_SMC1];

	/* Disable transmitter/receiver.
	*/
	sp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);

	/* Use Port D for SMC1 instead of other functions.
	*/
	io->iop_ppard |= 0x00c00000;
	io->iop_pdird |= 0x00400000;
	io->iop_pdird &= ~0x00800000;
	io->iop_psord &= ~0x00c00000;
#endif

	/* Allocate space for two buffer descriptors in the DP ram.
	 * For now, this address seems OK, but it may have to
	 * change with newer versions of the firmware.
	 */
	dpaddr = 0x0800;

	/* Grab a few bytes from the top of memory.
	 */
	memaddr = (bd->bi_memsize - 256) & ~15;

	/* Set the physical address of the host memory buffers in
	 * the buffer descriptors.
	 */
	rbdf = (cbd_t *)&ip->im_dprambase[dpaddr];
	rbdf->cbd_bufaddr = memaddr;
	rbdf->cbd_sc = 0;
	tbdf = rbdf + 1;
	tbdf->cbd_bufaddr = memaddr+128;
	tbdf->cbd_sc = 0;

	/* Set up the uart parameters in the parameter ram.
	*/
#ifdef SCC_CONSOLE
	sup->scc_genscc.scc_rbase = dpaddr;
	sup->scc_genscc.scc_tbase = dpaddr + sizeof(cbd_t);

	/* Set up the uart parameters in the
	 * parameter ram.
	 */
	sup->scc_genscc.scc_rfcr = CPMFCR_GBL | CPMFCR_EB;
	sup->scc_genscc.scc_tfcr = CPMFCR_GBL | CPMFCR_EB;

	sup->scc_genscc.scc_mrblr = 128;
	sup->scc_maxidl = 8;
	sup->scc_brkcr = 1;
	sup->scc_parec = 0;
	sup->scc_frmec = 0;
	sup->scc_nosec = 0;
	sup->scc_brkec = 0;
	sup->scc_uaddr1 = 0;
	sup->scc_uaddr2 = 0;
	sup->scc_toseq = 0;
	sup->scc_char1 = 0x8000;
	sup->scc_char2 = 0x8000;
	sup->scc_char3 = 0x8000;
	sup->scc_char4 = 0x8000;
	sup->scc_char5 = 0x8000;
	sup->scc_char6 = 0x8000;
	sup->scc_char7 = 0x8000;
	sup->scc_char8 = 0x8000;
	sup->scc_rccm = 0xc0ff;

	/* Send the CPM an initialize command.
	*/
	cp->cp_cpcr = mk_cr_cmd(CPM_CR_SCC1_PAGE, CPM_CR_SCC1_SBLOCK, 0,
			CPM_CR_INIT_TRX) | CPM_CR_FLG;
	while (cp->cp_cpcr & CPM_CR_FLG);

	/* Set UART mode, 8 bit, no parity, one stop.
	 * Enable receive and transmit.
	 */
	sccp->scc_gsmrh = 0;
	sccp->scc_gsmrl =
		(SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);

	/* Disable all interrupts and clear all pending
	 * events.
	 */
	sccp->scc_sccm = 0;
	sccp->scc_scce = 0xffff;
	sccp->scc_dsr = 0x7e7e;
	sccp->scc_psmr = 0x3000;

	/* Wire BRG1 to SCC1.  The console driver will take care of
	 * others.
	 */
	ip->im_cpmux.cmx_scr = 0;
#else
	up->smc_rbase = dpaddr;
	up->smc_tbase = dpaddr+sizeof(cbd_t);
	up->smc_rfcr = CPMFCR_EB;
	up->smc_tfcr = CPMFCR_EB;
	up->smc_brklen = 0;
	up->smc_brkec = 0;
	up->smc_brkcr = 0;
	up->smc_mrblr = 128;
	up->smc_maxidl = 8;

	/* Set UART mode, 8 bit, no parity, one stop.
	 * Enable receive and transmit.
	 */
	sp->smc_smcmr = smcr_mk_clen(9) |  SMCMR_SM_UART;

	/* Mask all interrupts and remove anything pending.
	*/
	sp->smc_smcm = 0;
	sp->smc_smce = 0xff;

	/* Set up the baud rate generator.
	 */
	ip->im_cpmux.cmx_smr = 0;
#endif

	/* The baud rate divisor needs to be coordinated with clk_8260().
	*/
	ip->im_brgc1 =
		(((bd->bi_brgfreq/16) / bd->bi_baudrate) << 1) |
								CPM_BRG_EN;

	/* Make the first buffer the only buffer.
	*/
	tbdf->cbd_sc |= BD_SC_WRAP;
	rbdf->cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP;

	/* Initialize Tx/Rx parameters.
	*/
#ifdef SCC_CONSOLE
	sccp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
#else
	cp->cp_cpcr = mk_cr_cmd(CPM_CR_SMC1_PAGE, CPM_CR_SMC1_SBLOCK, 0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
	while (cp->cp_cpcr & CPM_CR_FLG);

	/* Enable transmitter/receiver.
	*/
	sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
#endif

	/* This is ignored.
	*/
	return 0;
}

int
serial_readbuf(u_char *cbuf)
{
	volatile cbd_t		*rbdf;
	volatile char		*buf;
#ifdef SCC_CONSOLE
	volatile scc_uart_t	*sup;
#else
	volatile smc_uart_t	*up;
#endif
	volatile cpm2_map_t	*ip;
	int	i, nc;

	ip = (cpm2_map_t *)CPM_MAP_ADDR;

#ifdef SCC_CONSOLE
	sup = (scc_uart_t *)&ip->im_dprambase[PROFF_SCC1 + ((SCC_CONSOLE-1) << 8)];
	rbdf = (cbd_t *)&ip->im_dprambase[sup->scc_genscc.scc_rbase];
#else
	up = (smc_uart_t *)&(ip->im_dprambase[PROFF_SMC1]);
	rbdf = (cbd_t *)&ip->im_dprambase[up->smc_rbase];
#endif

	/* Wait for character to show up.
	*/
	buf = (char *)rbdf->cbd_bufaddr;
	while (rbdf->cbd_sc & BD_SC_EMPTY);
	nc = rbdf->cbd_datlen;
	for (i=0; i<nc; i++)
		*cbuf++ = *buf++;
	rbdf->cbd_sc |= BD_SC_EMPTY;

	return(nc);
}

void
serial_putc(void *ignored, const char c)
{
	volatile cbd_t		*tbdf;
	volatile char		*buf;
#ifdef SCC_CONSOLE
	volatile scc_uart_t	*sup;
#else
	volatile smc_uart_t	*up;
#endif
	volatile cpm2_map_t	*ip;

	ip = (cpm2_map_t *)CPM_MAP_ADDR;
#ifdef SCC_CONSOLE
	sup = (scc_uart_t *)&ip->im_dprambase[PROFF_SCC1 + ((SCC_CONSOLE-1) << 8)];
	tbdf = (cbd_t *)&ip->im_dprambase[sup->scc_genscc.scc_tbase];
#else
	up = (smc_uart_t *)&(ip->im_dprambase[PROFF_SMC1]);
	tbdf = (cbd_t *)&ip->im_dprambase[up->smc_tbase];
#endif

	/* Wait for last character to go.
	*/
	buf = (char *)tbdf->cbd_bufaddr;
	while (tbdf->cbd_sc & BD_SC_READY);

	*buf = c;
	tbdf->cbd_datlen = 1;
	tbdf->cbd_sc |= BD_SC_READY;
}

char
serial_getc(void *ignored)
{
	char	c;

	if (cons_hold_cnt <= 0) {
		cons_hold_cnt = serial_readbuf(cons_hold);
		sgptr = cons_hold;
	}
	c = *sgptr++;
	cons_hold_cnt--;

	return(c);
}

int
serial_tstc(void *ignored)
{
	volatile cbd_t		*rbdf;
#ifdef SCC_CONSOLE
	volatile scc_uart_t	*sup;
#else
	volatile smc_uart_t	*up;
#endif
	volatile cpm2_map_t	*ip;

	ip = (cpm2_map_t *)CPM_MAP_ADDR;
#ifdef SCC_CONSOLE
	sup = (scc_uart_t *)&ip->im_dprambase[PROFF_SCC1 + ((SCC_CONSOLE-1) << 8)];
	rbdf = (cbd_t *)&ip->im_dprambase[sup->scc_genscc.scc_rbase];
#else
	up = (smc_uart_t *)&(ip->im_dprambase[PROFF_SMC1]);
	rbdf = (cbd_t *)&ip->im_dprambase[up->smc_rbase];
#endif

	return(!(rbdf->cbd_sc & BD_SC_EMPTY));
}