aboutsummaryrefslogtreecommitdiffstats
path: root/arch/ppc/boot/simple/m8xx_tty.c
blob: ea615d8ca541a233d9ebaf88d1ffc6edf862c643 (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
/* Minimal serial functions needed to send messages out the serial
 * port on the MBX console.
 *
 * The MBX uses SMC1 for the serial port.  We reset the port and use
 * only the first BD that EPPC-Bug set up as a character FIFO.
 *
 * Later versions (at least 1.4, maybe earlier) of the MBX EPPC-Bug
 * use COM1 instead of SMC1 as the console port.  This kinda sucks
 * for the rest of the kernel, so here we force the use of SMC1 again.
 */
#include <linux/types.h>
#include <asm/uaccess.h>
#include <asm/mpc8xx.h>
#include <asm/commproc.h>

#ifdef CONFIG_MBX
#define MBX_CSR1	((volatile u_char *)0xfa100000)
#define CSR1_COMEN	(u_char)0x02
#endif

#ifdef TQM_SMC2_CONSOLE
#define PROFF_CONS	PROFF_SMC2
#define CPM_CR_CH_CONS	CPM_CR_CH_SMC2
#define SMC_INDEX	1
static volatile iop8xx_t *iopp = (iop8xx_t *)&(((immap_t *)IMAP_ADDR)->im_ioport);
#else
#define PROFF_CONS	PROFF_SMC1
#define CPM_CR_CH_CONS	CPM_CR_CH_SMC1
#define SMC_INDEX	0
#endif

static cpm8xx_t	*cpmp = (cpm8xx_t *)&(((immap_t *)IMAP_ADDR)->im_cpm);

unsigned long
serial_init(int ignored, bd_t *bd)
{
	volatile smc_t		*sp;
	volatile smc_uart_t	*up;
	volatile cbd_t	*tbdf, *rbdf;
	volatile cpm8xx_t	*cp;
	uint	dpaddr, memaddr;
#ifndef CONFIG_MBX
	uint	ui;
#endif

	cp = cpmp;
	sp = (smc_t*)&(cp->cp_smc[SMC_INDEX]);
	up = (smc_uart_t *)&cp->cp_dparam[PROFF_CONS];

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

#ifdef CONFIG_FADS
	/* Enable SMC1/2 transceivers.
	*/
	*((volatile uint *)BCSR1) &= ~(BCSR1_RS232EN_1|BCSR1_RS232EN_2);
#endif

#ifndef CONFIG_MBX
	{
	/* Initialize SMCx and use it for the console port.
	 */

	/* Enable SDMA.
	*/
	((immap_t *)IMAP_ADDR)->im_siu_conf.sc_sdcr = 1;

#ifdef TQM_SMC2_CONSOLE
	/* Use Port A for SMC2 instead of other functions.
	*/
	iopp->iop_papar |=  0x00c0;
	iopp->iop_padir &= ~0x00c0;
	iopp->iop_paodr &= ~0x00c0;
#else
	/* Use Port B for SMCs instead of other functions.
	*/
	cp->cp_pbpar |= 0x00000cc0;
	cp->cp_pbdir &= ~0x00000cc0;
	cp->cp_pbodr &= ~0x00000cc0;
#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 for SMC FIFOs.
	 */
	memaddr = (bd->bi_memsize - 32) & ~15;

	/* Set the physical address of the host memory buffers in
	 * the buffer descriptors.
	 */
	rbdf = (cbd_t *)&cp->cp_dpmem[dpaddr];
	rbdf->cbd_bufaddr = memaddr;
	rbdf->cbd_sc = 0;
	tbdf = rbdf + 1;
	tbdf->cbd_bufaddr = memaddr+4;
	tbdf->cbd_sc = 0;

	/* Set up the uart parameters in the parameter ram.
	*/
	up->smc_rbase = dpaddr;
	up->smc_tbase = dpaddr+sizeof(cbd_t);
	up->smc_rfcr = SMC_EB;
	up->smc_tfcr = SMC_EB;

	/* 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.
	 * See 8xx_io/commproc.c for details.
	 * This wires BRG1 to SMC1 and BRG2 to SMC2;
	 */
	cp->cp_simode = 0x10000000;
	ui = bd->bi_intfreq / 16 / bd->bi_baudrate;
#ifdef TQM_SMC2_CONSOLE
	cp->cp_brgc2 =
#else
	cp->cp_brgc1 =
#endif
		((ui - 1) < 4096)
		? (((ui - 1) << 1) | CPM_BRG_EN)
		: ((((ui / 16) - 1) << 1) | CPM_BRG_EN | CPM_BRG_DIV16);

#else /* CONFIG_MBX */
	if (*MBX_CSR1 & CSR1_COMEN) {
		/* COM1 is enabled.  Initialize SMC1 and use it for
		 * the console port.
		 */

		/* Enable SDMA.
		*/
		((immap_t *)IMAP_ADDR)->im_siu_conf.sc_sdcr = 1;

		/* Use Port B for SMCs instead of other functions.
		*/
		cp->cp_pbpar |= 0x00000cc0;
		cp->cp_pbdir &= ~0x00000cc0;
		cp->cp_pbodr &= ~0x00000cc0;

		/* 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.  EPPC-Bug isn't
		 * running any more, so we can do this.
		 */
		memaddr = (bd->bi_memsize - 32) & ~15;

		/* Set the physical address of the host memory buffers in
		 * the buffer descriptors.
		 */
		rbdf = (cbd_t *)&cp->cp_dpmem[dpaddr];
		rbdf->cbd_bufaddr = memaddr;
		rbdf->cbd_sc = 0;
		tbdf = rbdf + 1;
		tbdf->cbd_bufaddr = memaddr+4;
		tbdf->cbd_sc = 0;

		/* Set up the uart parameters in the parameter ram.
		*/
		up->smc_rbase = dpaddr;
		up->smc_tbase = dpaddr+sizeof(cbd_t);
		up->smc_rfcr = SMC_EB;
		up->smc_tfcr = SMC_EB;

		/* 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.
		 * See 8xx_io/commproc.c for details.
		 */
		cp->cp_simode = 0x10000000;
		cp->cp_brgc1 =
			(((bd->bi_intfreq/16) / 9600) << 1) | CPM_BRG_EN;

		/* Enable SMC1 for console output.
		*/
		*MBX_CSR1 &= ~CSR1_COMEN;
	}
	else {
#endif /* ndef CONFIG_MBX */
		/* SMCx is used as console port.
		*/
		tbdf = (cbd_t *)&cp->cp_dpmem[up->smc_tbase];
		rbdf = (cbd_t *)&cp->cp_dpmem[up->smc_rbase];

		/* Issue a stop transmit, and wait for it.
		*/
		cp->cp_cpcr = mk_cr_cmd(CPM_CR_CH_CONS,
					CPM_CR_STOP_TX) | CPM_CR_FLG;
		while (cp->cp_cpcr & CPM_CR_FLG);
	}

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

	/* Single character receive.
	*/
	up->smc_mrblr = 1;
	up->smc_maxidl = 0;

	/* Initialize Tx/Rx parameters.
	*/
	cp->cp_cpcr = mk_cr_cmd(CPM_CR_CH_CONS, CPM_CR_INIT_TRX) | CPM_CR_FLG;
	while (cp->cp_cpcr & CPM_CR_FLG);

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

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

void
serial_putc(void *ignored, const char c)
{
	volatile cbd_t		*tbdf;
	volatile char		*buf;
	volatile smc_uart_t	*up;

	up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_CONS];
	tbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_tbase];

	/* 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)
{
	volatile cbd_t		*rbdf;
	volatile char		*buf;
	volatile smc_uart_t	*up;
	char			c;

	up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_CONS];
	rbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase];

	/* Wait for character to show up.
	*/
	buf = (char *)rbdf->cbd_bufaddr;
	while (rbdf->cbd_sc & BD_SC_EMPTY);
	c = *buf;
	rbdf->cbd_sc |= BD_SC_EMPTY;

	return(c);
}

int
serial_tstc(void *ignored)
{
	volatile cbd_t		*rbdf;
	volatile smc_uart_t	*up;

	up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_CONS];
	rbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase];

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