Root/tools/lib/atben.c

Source at commit b0a3001ca23e9ba9a0d004b9971563cc5ef659ea created 7 years 3 months ago.
By Werner Almesberger, atusb/atusb.kicad_pcb (C15): resolve silk screen on pad; add via
1/*
2 * lib/atben.c - ATRF access functions library (Ben 8:10 card version)
3 *
4 * Written 2010-2011, 2013 by Werner Almesberger
5 * Copyright 2010-2011, 2013 Werner Almesberger
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13
14#include <stdint.h>
15#include <stdlib.h>
16#include <stdio.h>
17#include <unistd.h>
18#include <fcntl.h>
19#include <dirent.h>
20#include <fnmatch.h>
21#include <sys/mman.h>
22
23#include "at86rf230.h"
24#include "timeout.h"
25#include "driver.h"
26
27
28enum {
29    VDD_OFF = 1 << 2, /* VDD disable, PD02 */
30    MOSI = 1 << 8, /* CMD, PD08 */
31#ifdef OLD
32    CLK = 1 << 9, /* CLK, PD09 */
33#else
34    SLP_TR = 1 << 9, /* CLK, PD09 */
35#endif
36    MISO = 1 << 10, /* DAT0, PD10 */
37    SCLK = 1 << 11, /* DAT1, PD11 */
38    IRQ = 1 << 12, /* DAT2, PD12 */
39    nSEL = 1 << 13, /* DAT3/CD, PD13 */
40};
41
42
43#define MMC_PATH "/sys/bus/platform/drivers/jz4740-mmc"
44#define AT86RF230_PATH "/sys/bus/spi/drivers/at86rf230"
45
46
47#define SOC_BASE 0x10000000
48
49#define REG(n) (*(volatile uint32_t *) (dsc->mem+(n)))
50
51#define CGU(n) REG(0x00000+(n))
52#define GPIO(n) REG(0x10000+(n))
53#define MSC(n) REG(0x21000+(n))
54
55#define PDPIN GPIO(0x300) /* port D pin level */
56#define PDDATS GPIO(0x314) /* port D data set */
57#define PDDATC GPIO(0x318) /* port D data clear */
58#define PDFUNS GPIO(0x344) /* port D function set */
59#define PDFUNC GPIO(0x348) /* port D function clear */
60#define PDDIRS GPIO(0x364) /* port D direction set */
61#define PDDIRC GPIO(0x368) /* port D direction clear */
62
63#define MSC_STRPCL MSC(0x00) /* Start/stop MMC/SD clock */
64#define MSC_CLKRT MSC(0x08) /* MSC Clock Rate */
65
66#define CLKGR CGU(0x0020) /* Clock Gate */
67#define MSCCDR CGU(0x0068) /* MSC device clock divider */
68
69
70#define PAGE_SIZE 4096
71
72
73struct atben_dsc {
74    int fd;
75    void *mem;
76};
77
78
79/* ----- Reset functions --------------------------------------------------- */
80
81
82static void wait_for_power(void)
83{
84    /*
85     * Give power time to stabilize and the chip time to reset.
86     * Power takes about 2 ms to ramp up. We wait 10 ms to be sure.
87     */
88    usleep(10*1000);
89}
90
91
92static void atben_cycle(struct atben_dsc *dsc)
93{
94    /* stop the MMC bus clock */
95    MSC_STRPCL = 1;
96
97    /* drive all outputs low (including the MMC bus clock) */
98#ifdef OLD
99    PDDATC = MOSI | CLK | SCLK | nSEL;
100
101    /* make the MMC bus clock a regular output */
102    PDFUNC = CLK;
103#else
104    PDDATC = MOSI | SLP_TR | SCLK | nSEL;
105    PDFUNC = SLP_TR;
106#endif
107
108    /* cut the power */
109    PDDATS = VDD_OFF;
110
111    /* Power drains within about 20 ms. Wait 100 ms to be sure. */
112    usleep(100*1000);
113
114    /* drive MOSI and nSS high */
115    PDDATS = MOSI | nSEL;
116
117    /* precharge the capacitors to avoid current surge */
118    wait_for_power();
119
120#ifdef OLD
121
122    /* return the bus clock output to the MMC controller */
123    PDFUNS = CLK;
124
125    /* start MMC clock output */
126    MSC_STRPCL = 2;
127#endif
128
129    /* supply power */
130    PDDATC = VDD_OFF;
131
132    wait_for_power();
133}
134
135
136/* ----- Low-level SPI operations ------------------------------------------ */
137
138
139static void spi_begin(struct atben_dsc *dsc)
140{
141    PDDATC = nSEL;
142}
143
144
145static void spi_end(struct atben_dsc *dsc)
146{
147    PDDATS = nSEL;
148}
149
150
151static void spi_send(struct atben_dsc *dsc, uint8_t v)
152{
153    uint8_t mask;
154
155    for (mask = 0x80; mask; mask >>= 1) {
156        if (v & mask)
157            PDDATS = MOSI;
158        else
159            PDDATC = MOSI;
160        PDDATS = SCLK;
161        PDDATC = SCLK;
162    }
163}
164
165
166static uint8_t spi_recv(struct atben_dsc *dsc)
167{
168    uint8_t res = 0;
169        uint8_t mask;
170
171    for (mask = 0x80; mask; mask >>= 1) {
172        if (PDPIN & MISO)
173            res |= mask;
174        PDDATS = SCLK;
175        PDDATC = SCLK;
176    }
177        return res;
178}
179
180
181/* ----- Driver operations ------------------------------------------------- */
182
183
184static void atben_reset_rf(void *handle)
185{
186    struct atben_dsc *dsc = handle;
187
188    atben_cycle(dsc);
189    wait_for_power();
190}
191
192
193static int find_file(const char *path, const char *pattern)
194{
195    DIR *dir;
196    const struct dirent *de;
197
198    dir = opendir(path);
199    if (!dir)
200        return 0;
201    while ((de = readdir(dir)))
202        if (!fnmatch(pattern, de->d_name, 0))
203            break;
204    if (closedir(dir) < 0) {
205        perror("closedir");
206        exit(1);
207    }
208    return !!de;
209}
210
211
212static int slot_in_use(void)
213{
214    if (find_file(MMC_PATH, "*.0")) {
215        fprintf(stderr,
216"The 8:10 card slot is currently used by the MMC controller.\n"
217"You can try to detach it with:\n"
218"# echo jz4740-mmc.0 >/sys/bus/platform/drivers/jz4740-mmc/unbind\n");
219        return 1;
220    }
221    if (find_file(AT86RF230_PATH, "*.0")) {
222        fprintf(stderr,
223"The 8:10 card slot is currently used by the AT86RF230 kernel driver.\n"
224"You can try to detach it with:\n"
225"# cd /sys/bus/spi/drivers/at86rf230\n"
226"# echo spi*.0 >unbind\n");
227        return 1;
228    }
229    return 0;
230}
231
232
233static void *atben_open(const char *arg)
234{
235    struct atben_dsc *dsc;
236
237    if (slot_in_use())
238        return NULL;
239
240    dsc = malloc(sizeof(*dsc));
241    if (!dsc) {
242        perror("malloc");
243        exit(1);
244    }
245
246    dsc->fd = open("/dev/mem", O_RDWR | O_SYNC);
247    if (dsc->fd < 0) {
248        perror("/dev/mem");
249        exit(1);
250    }
251    dsc->mem = mmap(NULL, PAGE_SIZE*3*16, PROT_READ | PROT_WRITE,
252        MAP_SHARED, dsc->fd, SOC_BASE);
253        if (dsc->mem == MAP_FAILED) {
254                perror("mmap");
255                exit(1);
256        }
257
258    /* set the output levels */
259    PDDATS = nSEL | VDD_OFF;
260    PDDATC = SCLK;
261
262    /* take the GPIOs away from the MMC controller */
263#ifdef OLD
264    PDFUNC = MOSI | MISO | SCLK | IRQ | nSEL;
265    PDFUNS = CLK;
266#else
267    PDFUNC = MOSI | MISO | SCLK | IRQ | nSEL | SLP_TR;
268#endif
269
270    /* set the pin directions */
271    PDDIRC = MISO | IRQ;
272#ifdef OLD
273    PDDIRS = MOSI | CLK | SCLK | nSEL;
274#else
275    PDDIRS = MOSI | SLP_TR | SCLK | nSEL;
276#endif
277
278    /* let capacitors precharge */
279    wait_for_power();
280
281    /* enable power */
282    PDDATC = VDD_OFF;
283
284#ifdef OLD
285    /* set the MSC clock to 336 MHz / 21 = 16 MHz */
286    MSCCDR = 20;
287    /*
288     * Enable the MSC clock. We need to do this before accessing any
289     * registers of the MSC block !
290     */
291    CLKGR &= ~(1 << 7);
292    /* bus clock = MSC clock / 1 */
293    MSC_CLKRT = 0;
294    /* start MMC clock output */
295    MSC_STRPCL = 2;
296#endif
297
298    wait_for_power();
299    atben_reset_rf(dsc);
300
301    return dsc;
302}
303
304
305static void atben_close(void *arg)
306{
307    struct atben_dsc *dsc = arg;
308
309    /* stop the MMC bus clock */
310    MSC_STRPCL = 1;
311
312    /* cut the power */
313    PDDATS = VDD_OFF;
314
315    /* make all MMC pins inputs */
316#ifdef OLD
317    PDDIRC = MOSI | MISO | CLK | SCLK | IRQ | nSEL;
318#else
319    PDDIRC = MOSI | MISO | SLP_TR | SCLK | IRQ | nSEL;
320#endif
321}
322
323
324static void atben_reg_write(void *handle, uint8_t reg, uint8_t v)
325{
326    struct atben_dsc *dsc = handle;
327
328    spi_begin(dsc);
329    spi_send(dsc, AT86RF230_REG_WRITE | reg);
330    spi_send(dsc, v);
331    spi_end(dsc);
332}
333
334
335static uint8_t atben_reg_read(void *handle, uint8_t reg)
336{
337    struct atben_dsc *dsc = handle;
338    uint8_t res;
339
340    spi_begin(dsc);
341    spi_send(dsc, AT86RF230_REG_READ | reg);
342    res = spi_recv(dsc);
343    spi_end(dsc);
344    return res;
345}
346
347
348static void atben_buf_write(void *handle, const void *buf, int size)
349{
350    struct atben_dsc *dsc = handle;
351
352    spi_begin(dsc);
353    spi_send(dsc, AT86RF230_BUF_WRITE);
354    spi_send(dsc, size);
355    while (size--)
356        spi_send(dsc, *(uint8_t *) buf++);
357    spi_end(dsc);
358}
359
360
361static int atben_buf_read(void *handle, void *buf, int size)
362{
363    struct atben_dsc *dsc = handle;
364    uint8_t len, i;
365
366    spi_begin(dsc);
367    spi_send(dsc, AT86RF230_BUF_READ);
368    len = spi_recv(dsc);
369    len++; /* LQI */
370    if (len > size)
371        len = size;
372    for (i = 0; i != len; i++)
373        *(uint8_t *) buf++ = spi_recv(dsc);
374    spi_end(dsc);
375    return len;
376}
377
378
379static void atben_sram_write(void *handle, uint8_t addr, uint8_t v)
380{
381    struct atben_dsc *dsc = handle;
382
383    spi_begin(dsc);
384    spi_send(dsc, AT86RF230_SRAM_WRITE);
385    spi_send(dsc, addr);
386    spi_send(dsc, v);
387    spi_end(dsc);
388}
389
390
391static uint8_t atben_sram_read(void *handle, uint8_t addr)
392{
393    struct atben_dsc *dsc = handle;
394    uint8_t res;
395
396    spi_begin(dsc);
397    spi_send(dsc, AT86RF230_SRAM_READ);
398    spi_send(dsc, addr);
399    res = spi_recv(dsc);
400    spi_end(dsc);
401    return res;
402}
403
404
405/* ----- SLP_TR ------------------------------------------------------------ */
406
407
408static void atben_slp_tr(void *handle, int on, int pulse)
409{
410    struct atben_dsc *dsc = handle;
411
412    if (on)
413        PDDATS = SLP_TR;
414    else
415        PDDATC = SLP_TR;
416    if (!pulse)
417        return;
418    if (on)
419        PDDATC = SLP_TR;
420    else
421        PDDATS = SLP_TR;
422}
423
424
425/* ----- RF interrupt ------------------------------------------------------ */
426
427
428static int atben_interrupt(void *handle)
429{
430        struct atben_dsc *dsc = handle;
431
432    return !!(PDPIN & IRQ);
433}
434
435
436int atben_interrupt_wait(void *handle, int timeout_ms)
437{
438    struct timeout to;
439    int timedout = 0;
440    uint8_t irq;
441
442    if (timeout_ms > 0)
443        timeout_start(&to, timeout_ms);
444    while (1) {
445        if (timeout_ms > 0)
446            timedout = timeout_reached(&to);
447        if (atben_interrupt(handle)) {
448            irq = atben_reg_read(handle, REG_IRQ_STATUS);
449            if (irq)
450                return irq;
451            fprintf(stderr, "ignoring stray interrupt\n");
452        }
453        if (timedout)
454            return 0;
455        if (timeout_ms >= 0)
456            usleep(1000);
457    }
458
459    return 0;
460}
461
462
463/* ----- Driver-specific hacks --------------------------------------------- */
464
465
466void *atben_regs(void *handle)
467{
468        struct atben_dsc *dsc = handle;
469
470    return dsc->mem;
471}
472
473
474/* ----- Driver interface -------------------------------------------------- */
475
476
477struct atrf_driver atben_driver = {
478    .name = "ben",
479    .open = atben_open,
480    .close = atben_close,
481    .reset = NULL,
482    .reset_rf = atben_reset_rf,
483    .test_mode = NULL,
484    .slp_tr = atben_slp_tr,
485    .reg_write = atben_reg_write,
486    .reg_read = atben_reg_read,
487    .buf_write = atben_buf_write,
488    .buf_read = atben_buf_read,
489    .sram_write = atben_sram_write,
490    .sram_read = atben_sram_read,
491    .interrupt_wait = atben_interrupt_wait,
492};
493

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