zssp.c revision 1.7 1 /* $NetBSD: zssp.c,v 1.7 2009/03/11 09:10:39 nonaka Exp $ */
2 /* $OpenBSD: zaurus_ssp.c,v 1.6 2005/04/08 21:58:49 uwe Exp $ */
3
4 /*
5 * Copyright (c) 2005 Uwe Stuehler <uwe (at) bsdx.de>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include <sys/cdefs.h>
21 __KERNEL_RCSID(0, "$NetBSD: zssp.c,v 1.7 2009/03/11 09:10:39 nonaka Exp $");
22
23 #include <sys/param.h>
24 #include <sys/systm.h>
25 #include <sys/device.h>
26
27 #include <machine/bus.h>
28
29 #include <arm/xscale/pxa2x0reg.h>
30 #include <arm/xscale/pxa2x0var.h>
31 #include <arm/xscale/pxa2x0_gpio.h>
32
33 #include <zaurus/dev/zsspvar.h>
34 #include <zaurus/zaurus/zaurus_var.h>
35
36 #define GPIO_ADS7846_CS_C3000 14 /* SSP SFRM */
37 #define GPIO_MAX1111_CS_C3000 20
38 #define GPIO_TG_CS_C3000 53
39
40 #define SSCR0_ADS7846_C3000 0x06ab /* 12bit/Microwire/div by 7 */
41 #define SSCR0_MAX1111 0x0387
42 #define SSCR0_LZ9JG18 0x01ab
43
44 struct zssp_softc {
45 device_t sc_dev;
46 bus_space_tag_t sc_iot;
47 bus_space_handle_t sc_ioh;
48 };
49
50 static int zssp_match(device_t, cfdata_t, void *);
51 static void zssp_attach(device_t, device_t, void *);
52
53 CFATTACH_DECL_NEW(zssp, sizeof(struct zssp_softc),
54 zssp_match, zssp_attach, NULL, NULL);
55
56 static void zssp_init(void);
57 static bool zssp_resume(device_t dv PMF_FN_ARGS);
58
59 static struct zssp_softc *zssp_sc;
60
61 static int
62 zssp_match(device_t parent, cfdata_t cf, void *aux)
63 {
64
65 if (zssp_sc != NULL)
66 return 0;
67
68 return 1;
69 }
70
71 static void
72 zssp_attach(device_t parent, device_t self, void *aux)
73 {
74 struct zssp_softc *sc = device_private(self);
75
76 sc->sc_dev = self;
77 zssp_sc = sc;
78
79 aprint_normal("\n");
80 aprint_naive("\n");
81
82 sc->sc_iot = &pxa2x0_bs_tag;
83 if (bus_space_map(sc->sc_iot, PXA2X0_SSP1_BASE, PXA2X0_SSP_SIZE,
84 0, &sc->sc_ioh)) {
85 aprint_error_dev(sc->sc_dev, "can't map bus space\n");
86 return;
87 }
88
89 if (!pmf_device_register(sc->sc_dev, NULL, zssp_resume))
90 aprint_error_dev(sc->sc_dev,
91 "couldn't establish power handler\n");
92
93 zssp_init();
94 }
95
96 /*
97 * Initialize the dedicated SSP unit and disable all chip selects.
98 * This function is called with interrupts disabled.
99 */
100 static void
101 zssp_init(void)
102 {
103 struct zssp_softc *sc;
104
105 KASSERT(zssp_sc != NULL);
106 sc = zssp_sc;
107
108 pxa2x0_clkman_config(CKEN_SSP, 1);
109
110 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSCR0, SSCR0_LZ9JG18);
111 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSCR1, 0);
112
113 pxa2x0_gpio_set_function(GPIO_ADS7846_CS_C3000, GPIO_OUT|GPIO_SET);
114 pxa2x0_gpio_set_function(GPIO_MAX1111_CS_C3000, GPIO_OUT|GPIO_SET);
115 pxa2x0_gpio_set_function(GPIO_TG_CS_C3000, GPIO_OUT|GPIO_SET);
116 }
117
118 static bool
119 zssp_resume(device_t dv PMF_FN_ARGS)
120 {
121 int s;
122
123 s = splhigh();
124 zssp_init();
125 splx(s);
126
127 return true;
128 }
129
130 /*
131 * Transmit a single data word to one of the ICs, keep the chip selected
132 * afterwards, and don't wait for data to be returned in SSDR. Interrupts
133 * must be held off until zssp_ic_stop() gets called.
134 */
135 void
136 zssp_ic_start(int ic, uint32_t data)
137 {
138 struct zssp_softc *sc;
139
140 KASSERT(zssp_sc != NULL);
141 sc = zssp_sc;
142
143 /* disable other ICs */
144 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSCR0, 0);
145 if (ic != ZSSP_IC_ADS7846)
146 pxa2x0_gpio_set_bit(GPIO_ADS7846_CS_C3000);
147 if (ic != ZSSP_IC_LZ9JG18)
148 pxa2x0_gpio_set_bit(GPIO_TG_CS_C3000);
149 if (ic != ZSSP_IC_MAX1111)
150 pxa2x0_gpio_set_bit(GPIO_MAX1111_CS_C3000);
151
152 /* activate the chosen one */
153 switch (ic) {
154 case ZSSP_IC_ADS7846:
155 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSCR0,
156 SSCR0_ADS7846_C3000);
157 pxa2x0_gpio_clear_bit(GPIO_ADS7846_CS_C3000);
158 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSDR, data);
159 while ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, SSP_SSSR)
160 & SSSR_TNF) != SSSR_TNF)
161 continue; /* poll */
162 break;
163 case ZSSP_IC_LZ9JG18:
164 pxa2x0_gpio_clear_bit(GPIO_TG_CS_C3000);
165 break;
166 case ZSSP_IC_MAX1111:
167 pxa2x0_gpio_clear_bit(GPIO_MAX1111_CS_C3000);
168 break;
169 }
170 }
171
172 /*
173 * Read the last value from SSDR and deactivate all chip-selects.
174 */
175 uint32_t
176 zssp_ic_stop(int ic)
177 {
178 struct zssp_softc *sc;
179 uint32_t rv;
180
181 KASSERT(zssp_sc != NULL);
182 sc = zssp_sc;
183
184 switch (ic) {
185 case ZSSP_IC_ADS7846:
186 /* read result of last command */
187 while ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, SSP_SSSR)
188 & SSSR_RNE) != SSSR_RNE)
189 continue; /* poll */
190 rv = bus_space_read_4(sc->sc_iot, sc->sc_ioh, SSP_SSDR);
191 break;
192 case ZSSP_IC_LZ9JG18:
193 case ZSSP_IC_MAX1111:
194 /* last value received is irrelevant or undefined */
195 default:
196 rv = 0;
197 break;
198 }
199
200 pxa2x0_gpio_set_bit(GPIO_ADS7846_CS_C3000);
201 pxa2x0_gpio_set_bit(GPIO_TG_CS_C3000);
202 pxa2x0_gpio_set_bit(GPIO_MAX1111_CS_C3000);
203
204 return rv;
205 }
206
207 /*
208 * Activate one of the chip-select lines, transmit one word value in
209 * each direction, and deactivate the chip-select again.
210 */
211 uint32_t
212 zssp_ic_send(int ic, uint32_t data)
213 {
214
215 switch (ic) {
216 case ZSSP_IC_MAX1111:
217 return (zssp_read_max1111(data));
218 case ZSSP_IC_ADS7846:
219 return (zssp_read_ads7846(data));
220 case ZSSP_IC_LZ9JG18:
221 zssp_write_lz9jg18(data);
222 return 0;
223 default:
224 aprint_error("zssp: zssp_ic_send: invalid IC %d\n", ic);
225 return 0;
226 }
227 }
228
229 int
230 zssp_read_max1111(uint32_t cmd)
231 {
232 struct zssp_softc *sc;
233 int data[3];
234 int voltage[3]; /* voltage[0]: dummy */
235 int i;
236 int s;
237
238 KASSERT(zssp_sc != NULL);
239 sc = zssp_sc;
240
241 s = splhigh();
242
243 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSCR0, 0);
244 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSCR0, SSCR0_MAX1111);
245
246 pxa2x0_gpio_set_bit(GPIO_TG_CS_C3000);
247 pxa2x0_gpio_set_bit(GPIO_ADS7846_CS_C3000);
248 pxa2x0_gpio_clear_bit(GPIO_MAX1111_CS_C3000);
249
250 delay(1);
251
252 memset(data, 0, sizeof(data));
253 data[0] = cmd;
254 for (i = 0; i < __arraycount(data); i++) {
255 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSDR, data[i]);
256 while ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, SSP_SSSR)
257 & SSSR_TNF) != SSSR_TNF)
258 continue; /* poll */
259 /* XXX is this delay necessary? */
260 delay(1);
261 while ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, SSP_SSSR)
262 & SSSR_RNE) != SSSR_RNE)
263 continue; /* poll */
264 voltage[i] = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
265 SSP_SSDR);
266 }
267
268 pxa2x0_gpio_set_bit(GPIO_TG_CS_C3000);
269 pxa2x0_gpio_set_bit(GPIO_ADS7846_CS_C3000);
270 pxa2x0_gpio_set_bit(GPIO_MAX1111_CS_C3000);
271
272 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSCR0, 0);
273
274 splx(s);
275
276 /* XXX no idea what this means, but it's what Linux would do. */
277 if ((voltage[1] & 0xc0) != 0 || (voltage[2] & 0x3f) != 0)
278 return -1;
279 return ((voltage[1] << 2) & 0xfc) | ((voltage[2] >> 6) & 0x03);
280 }
281
282 /* XXX - only does CS_ADS7846 */
283 uint32_t
284 zssp_read_ads7846(uint32_t cmd)
285 {
286 struct zssp_softc *sc;
287 unsigned int cr0;
288 uint32_t val;
289 int s;
290
291 if (zssp_sc == NULL) {
292 printf("zssp_read_ads7846: not configured\n");
293 return 0;
294 }
295 sc = zssp_sc;
296
297 s = splhigh();
298
299 if (ZAURUS_ISC3000) {
300 cr0 = SSCR0_ADS7846_C3000;
301 } else {
302 cr0 = 0x00ab;
303 }
304 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSCR0, 0);
305 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSCR0, cr0);
306
307 pxa2x0_gpio_set_bit(GPIO_TG_CS_C3000);
308 pxa2x0_gpio_set_bit(GPIO_MAX1111_CS_C3000);
309 pxa2x0_gpio_clear_bit(GPIO_ADS7846_CS_C3000);
310
311 bus_space_write_4(sc->sc_iot, sc->sc_ioh, SSP_SSDR, cmd);
312
313 while ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, SSP_SSSR)
314 & SSSR_TNF) != SSSR_TNF)
315 continue; /* poll */
316
317 delay(1);
318
319 while ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, SSP_SSSR)
320 & SSSR_RNE) != SSSR_RNE)
321 continue; /* poll */
322
323 val = bus_space_read_4(sc->sc_iot, sc->sc_ioh, SSP_SSDR);
324
325 pxa2x0_gpio_set_bit(GPIO_ADS7846_CS_C3000);
326
327 splx(s);
328
329 return val;
330 }
331
332 void
333 zssp_write_lz9jg18(uint32_t data)
334 {
335 int sclk_pin, sclk_fn;
336 int sfrm_pin, sfrm_fn;
337 int txd_pin, txd_fn;
338 int rxd_pin, rxd_fn;
339 int i;
340 int s;
341
342 /* XXX this creates a DAC command from a backlight duty value. */
343 data = 0x40 | (data & 0x1f);
344
345 if (ZAURUS_ISC3000) {
346 sclk_pin = 19;
347 sfrm_pin = 14;
348 txd_pin = 87;
349 rxd_pin = 86;
350 } else {
351 sclk_pin = 23;
352 sfrm_pin = 24;
353 txd_pin = 25;
354 rxd_pin = 26;
355 }
356
357 s = splhigh();
358
359 sclk_fn = pxa2x0_gpio_get_function(sclk_pin);
360 sfrm_fn = pxa2x0_gpio_get_function(sfrm_pin);
361 txd_fn = pxa2x0_gpio_get_function(txd_pin);
362 rxd_fn = pxa2x0_gpio_get_function(rxd_pin);
363
364 pxa2x0_gpio_set_function(sfrm_pin, GPIO_OUT | GPIO_SET);
365 pxa2x0_gpio_set_function(sclk_pin, GPIO_OUT | GPIO_CLR);
366 pxa2x0_gpio_set_function(txd_pin, GPIO_OUT | GPIO_CLR);
367 pxa2x0_gpio_set_function(rxd_pin, GPIO_IN);
368
369 pxa2x0_gpio_set_bit(GPIO_MAX1111_CS_C3000);
370 pxa2x0_gpio_set_bit(GPIO_ADS7846_CS_C3000);
371 pxa2x0_gpio_clear_bit(GPIO_TG_CS_C3000);
372
373 delay(10);
374
375 for (i = 0; i < 8; i++) {
376 if (data & 0x80)
377 pxa2x0_gpio_set_bit(txd_pin);
378 else
379 pxa2x0_gpio_clear_bit(txd_pin);
380 delay(10);
381 pxa2x0_gpio_set_bit(sclk_pin);
382 delay(10);
383 pxa2x0_gpio_clear_bit(sclk_pin);
384 delay(10);
385 data <<= 1;
386 }
387
388 pxa2x0_gpio_clear_bit(txd_pin);
389 pxa2x0_gpio_set_bit(GPIO_TG_CS_C3000);
390
391 pxa2x0_gpio_set_function(sclk_pin, sclk_fn);
392 pxa2x0_gpio_set_function(sfrm_pin, sfrm_fn);
393 pxa2x0_gpio_set_function(txd_pin, txd_fn);
394 pxa2x0_gpio_set_function(rxd_pin, rxd_fn);
395
396 splx(s);
397 }
398