aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/serial/cpm_uart/cpm_uart_cpm2.c
blob: cdba128250a96e5f2f98a07c5dcbf2318c65ff92 (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
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
/*
 *  linux/drivers/serial/cpm_uart_cpm2.c
 *
 *  Driver for CPM (SCC/SMC) serial ports; CPM2 definitions
 *
 *  Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
 *              Pantelis Antoniou (panto@intracom.gr) (CPM1)
 * 
 *  Copyright (C) 2004 Freescale Semiconductor, Inc.
 *            (C) 2004 Intracom, S.A.
 *            (C) 2006 MontaVista Software, Inc.
 * 		Vitaly Bordug <vbordug@ru.mvista.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/device.h>
#include <linux/bootmem.h>
#include <linux/dma-mapping.h>

#include <asm/io.h>
#include <asm/irq.h>

#include <linux/serial_core.h>
#include <linux/kernel.h>

#include "cpm_uart.h"

/**************************************************************/

void cpm_line_cr_cmd(int line, int cmd)
{
	volatile cpm_cpm2_t *cp = cpmp;
	ulong val;

	switch (line) {
	case UART_SMC1:
		val = mk_cr_cmd(CPM_CR_SMC1_PAGE, CPM_CR_SMC1_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	case UART_SMC2:
		val = mk_cr_cmd(CPM_CR_SMC2_PAGE, CPM_CR_SMC2_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	case UART_SCC1:
		val = mk_cr_cmd(CPM_CR_SCC1_PAGE, CPM_CR_SCC1_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	case UART_SCC2:
		val = mk_cr_cmd(CPM_CR_SCC2_PAGE, CPM_CR_SCC2_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	case UART_SCC3:
		val = mk_cr_cmd(CPM_CR_SCC3_PAGE, CPM_CR_SCC3_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	case UART_SCC4:
		val = mk_cr_cmd(CPM_CR_SCC4_PAGE, CPM_CR_SCC4_SBLOCK, 0,
				cmd) | CPM_CR_FLG;
		break;
	default:
		return;

	}
	cp->cp_cpcr = val;
	while (cp->cp_cpcr & CPM_CR_FLG) ;
}

void smc1_lineif(struct uart_cpm_port *pinfo)
{
	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;

	/* SMC1 is only on port D */
	io->iop_ppard |= 0x00c00000;
	io->iop_pdird |= 0x00400000;
	io->iop_pdird &= ~0x00800000;
	io->iop_psord &= ~0x00c00000;

	/* Wire BRG1 to SMC1 */
	cpm2_immr->im_cpmux.cmx_smr &= 0x0f;
	pinfo->brg = 1;
}

void smc2_lineif(struct uart_cpm_port *pinfo)
{
	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;

	/* SMC2 is only on port A */
	io->iop_ppara |= 0x00c00000;
	io->iop_pdira |= 0x00400000;
	io->iop_pdira &= ~0x00800000;
	io->iop_psora &= ~0x00c00000;

	/* Wire BRG2 to SMC2 */
	cpm2_immr->im_cpmux.cmx_smr &= 0xf0;
	pinfo->brg = 2;
}

void scc1_lineif(struct uart_cpm_port *pinfo)
{
	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;

	/* 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 */

	/* Wire BRG1 to SCC1 */
	cpm2_immr->im_cpmux.cmx_scr &= 0x00ffffff;
	cpm2_immr->im_cpmux.cmx_scr |= 0x00000000;
	pinfo->brg = 1;
}

void scc2_lineif(struct uart_cpm_port *pinfo)
{
	/*
	 * STx GP3 uses the SCC2 secondary option pin assignment
	 * which this driver doesn't account for in the static
	 * pin assignments. This kind of board specific info
	 * really has to get out of the driver so boards can
	 * be supported in a sane fashion.
	 */
#ifndef CONFIG_STX_GP3
	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
	io->iop_pparb |= 0x008b0000;
	io->iop_pdirb |= 0x00880000;
	io->iop_psorb |= 0x00880000;
	io->iop_pdirb &= ~0x00030000;
	io->iop_psorb &= ~0x00030000;
#endif
	cpm2_immr->im_cpmux.cmx_scr &= 0xff00ffff;
	cpm2_immr->im_cpmux.cmx_scr |= 0x00090000;
	pinfo->brg = 2;
}

void scc3_lineif(struct uart_cpm_port *pinfo)
{
	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
	io->iop_pparb |= 0x008b0000;
	io->iop_pdirb |= 0x00880000;
	io->iop_psorb |= 0x00880000;
	io->iop_pdirb &= ~0x00030000;
	io->iop_psorb &= ~0x00030000;
	cpm2_immr->im_cpmux.cmx_scr &= 0xffff00ff;
	cpm2_immr->im_cpmux.cmx_scr |= 0x00001200;
	pinfo->brg = 3;
}

void scc4_lineif(struct uart_cpm_port *pinfo)
{
	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;

	io->iop_ppard |= 0x00000600;
	io->iop_psord &= ~0x00000600;	/* Tx/Rx */
	io->iop_pdird &= ~0x00000200;	/* Rx */
	io->iop_pdird |= 0x00000400;	/* Tx */

	cpm2_immr->im_cpmux.cmx_scr &= 0xffffff00;
	cpm2_immr->im_cpmux.cmx_scr |= 0x0000001b;
	pinfo->brg = 4;
}

/*
 * Allocate DP-Ram and memory buffers. We need to allocate a transmit and 
 * receive buffer descriptors from dual port ram, and a character
 * buffer area from host mem. If we are allocating for the console we need
 * to do it from bootmem
 */
int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
{
	int dpmemsz, memsz;
	u8 *dp_mem;
	uint dp_offset;
	u8 *mem_addr;
	dma_addr_t dma_addr = 0;

	pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);

	dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
	dp_offset = cpm_dpalloc(dpmemsz, 8);
	if (IS_DPERR(dp_offset)) {
		printk(KERN_ERR
		       "cpm_uart_cpm.c: could not allocate buffer descriptors\n");
		return -ENOMEM;
	}

	dp_mem = cpm_dpram_addr(dp_offset);

	memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
	    L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
	if (is_con) {
		mem_addr = alloc_bootmem(memsz);
		dma_addr = virt_to_bus(mem_addr);
	}
	else
		mem_addr = dma_alloc_coherent(NULL, memsz, &dma_addr,
					      GFP_KERNEL);

	if (mem_addr == NULL) {
		cpm_dpfree(dp_offset);
		printk(KERN_ERR
		       "cpm_uart_cpm.c: could not allocate coherent memory\n");
		return -ENOMEM;
	}

	pinfo->dp_addr = dp_offset;
	pinfo->mem_addr = mem_addr;
	pinfo->dma_addr = dma_addr;
	pinfo->mem_size = memsz;

	pinfo->rx_buf = mem_addr;
	pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
						       * pinfo->rx_fifosize);

	pinfo->rx_bd_base = (volatile cbd_t *)dp_mem;
	pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;

	return 0;
}

void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
{
	dma_free_coherent(NULL, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
					       pinfo->rx_fifosize) +
			  L1_CACHE_ALIGN(pinfo->tx_nrfifos *
					 pinfo->tx_fifosize), pinfo->mem_addr,
			  pinfo->dma_addr);

	cpm_dpfree(pinfo->dp_addr);
}

/* Setup any dynamic params in the uart desc */
int cpm_uart_init_portdesc(void)
{
	pr_debug("CPM uart[-]:init portdesc\n");

	cpm_uart_nr = 0;
#ifdef CONFIG_SERIAL_CPM_SMC1
	cpm_uart_ports[UART_SMC1].smcp = (smc_t *) & cpm2_immr->im_smc[0];
	cpm_uart_ports[UART_SMC1].smcup =
	    (smc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SMC1];
	*(u16 *)(&cpm2_immr->im_dprambase[PROFF_SMC1_BASE]) = PROFF_SMC1;
	cpm_uart_ports[UART_SMC1].port.mapbase =
	    (unsigned long)&cpm2_immr->im_smc[0];
	cpm_uart_ports[UART_SMC1].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
	cpm_uart_ports[UART_SMC1].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
	cpm_uart_ports[UART_SMC1].port.uartclk = (((bd_t *) __res)->bi_intfreq);
	cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1;
#endif

#ifdef CONFIG_SERIAL_CPM_SMC2
	cpm_uart_ports[UART_SMC2].smcp = (smc_t *) & cpm2_immr->im_smc[1];
	cpm_uart_ports[UART_SMC2].smcup =
	    (smc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SMC2];
	*(u16 *)(&cpm2_immr->im_dprambase[PROFF_SMC2_BASE]) = PROFF_SMC2;
	cpm_uart_ports[UART_SMC2].port.mapbase =
	    (unsigned long)&cpm2_immr->im_smc[1];
	cpm_uart_ports[UART_SMC2].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
	cpm_uart_ports[UART_SMC2].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
	cpm_uart_ports[UART_SMC2].port.uartclk = (((bd_t *) __res)->bi_intfreq);
	cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2;
#endif

#ifdef CONFIG_SERIAL_CPM_SCC1
	cpm_uart_ports[UART_SCC1].sccp = (scc_t *) & cpm2_immr->im_scc[0];
	cpm_uart_ports[UART_SCC1].sccup =
	    (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC1];
	cpm_uart_ports[UART_SCC1].port.mapbase =
	    (unsigned long)&cpm2_immr->im_scc[0];
	cpm_uart_ports[UART_SCC1].sccp->scc_sccm &=
	    ~(UART_SCCM_TX | UART_SCCM_RX);
	cpm_uart_ports[UART_SCC1].sccp->scc_gsmrl &=
	    ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
	cpm_uart_ports[UART_SCC1].port.uartclk = (((bd_t *) __res)->bi_intfreq);
	cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1;
#endif

#ifdef CONFIG_SERIAL_CPM_SCC2
	cpm_uart_ports[UART_SCC2].sccp = (scc_t *) & cpm2_immr->im_scc[1];
	cpm_uart_ports[UART_SCC2].sccup =
	    (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC2];
	cpm_uart_ports[UART_SCC2].port.mapbase =
	    (unsigned long)&cpm2_immr->im_scc[1];
	cpm_uart_ports[UART_SCC2].sccp->scc_sccm &=
	    ~(UART_SCCM_TX | UART_SCCM_RX);
	cpm_uart_ports[UART_SCC2].sccp->scc_gsmrl &=
	    ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
	cpm_uart_ports[UART_SCC2].port.uartclk = (((bd_t *) __res)->bi_intfreq);
	cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2;
#endif

#ifdef CONFIG_SERIAL_CPM_SCC3
	cpm_uart_ports[UART_SCC3].sccp = (scc_t *) & cpm2_immr->im_scc[2];
	cpm_uart_ports[UART_SCC3].sccup =
	    (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC3];
	cpm_uart_ports[UART_SCC3].port.mapbase =
	    (unsigned long)&cpm2_immr->im_scc[2];
	cpm_uart_ports[UART_SCC3].sccp->scc_sccm &=
	    ~(UART_SCCM_TX | UART_SCCM_RX);
	cpm_uart_ports[UART_SCC3].sccp->scc_gsmrl &=
	    ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
	cpm_uart_ports[UART_SCC3].port.uartclk = (((bd_t *) __res)->bi_intfreq);
	cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3;
#endif

#ifdef CONFIG_SERIAL_CPM_SCC4
	cpm_uart_ports[UART_SCC4].sccp = (scc_t *) & cpm2_immr->im_scc[3];
	cpm_uart_ports[UART_SCC4].sccup =
	    (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC4];
	cpm_uart_ports[UART_SCC4].port.mapbase =
	    (unsigned long)&cpm2_immr->im_scc[3];
	cpm_uart_ports[UART_SCC4].sccp->scc_sccm &=
	    ~(UART_SCCM_TX | UART_SCCM_RX);
	cpm_uart_ports[UART_SCC4].sccp->scc_gsmrl &=
	    ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
	cpm_uart_ports[UART_SCC4].port.uartclk = (((bd_t *) __res)->bi_intfreq);
	cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4;
#endif

	return 0;
}