root/dev/isa/gscsio.c

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DEFINITIONS

This source file includes following definitions.
  1. idxread
  2. idxwrite
  3. gscsio_probe
  4. gscsio_attach
  5. gscsio_acb_init
  6. gscsio_acb_wait
  7. gscsio_acb_reset
  8. gscsio_acb_acquire_bus
  9. gscsio_acb_release_bus
  10. gscsio_acb_send_start
  11. gscsio_acb_send_stop
  12. gscsio_acb_initiate_xfer
  13. gscsio_acb_read_byte
  14. gscsio_acb_write_byte

    1 /*      $OpenBSD: gscsio.c,v 1.9 2007/06/05 08:37:20 jsg Exp $  */
    2 /*
    3  * Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
    4  *
    5  * Permission to use, copy, modify, and distribute this software for any
    6  * purpose with or without fee is hereby granted, provided that the above
    7  * copyright notice and this permission notice appear in all copies.
    8  *
    9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   16  */
   17 
   18 /*
   19  * National Semiconductor Geode SC1100 Super I/O.
   20  * Only ACCESS.bus logical device is supported.
   21  */
   22 
   23 #include <sys/param.h>
   24 #include <sys/systm.h>
   25 #include <sys/device.h>
   26 #include <sys/kernel.h>
   27 #include <sys/rwlock.h>
   28 #include <sys/proc.h>
   29 
   30 #include <machine/bus.h>
   31 
   32 #include <dev/i2c/i2cvar.h>
   33 
   34 #include <dev/isa/isareg.h>
   35 #include <dev/isa/isavar.h>
   36 
   37 #include <dev/isa/gscsioreg.h>
   38 
   39 struct gscsio_softc {
   40         struct device sc_dev;
   41 
   42         bus_space_tag_t sc_iot;
   43         bus_space_handle_t sc_ioh;
   44 
   45         int sc_ld_en[GSCSIO_LDNUM];
   46         bus_space_handle_t sc_ld_ioh0[GSCSIO_LDNUM];
   47         bus_space_handle_t sc_ld_ioh1[GSCSIO_LDNUM];
   48 
   49         /* ACCESS.bus */
   50         struct gscsio_acb {
   51                 void *sc;
   52                 bus_space_handle_t ioh;
   53                 struct rwlock buslock;
   54         } sc_acb[2];
   55         struct i2c_controller sc_acb1_tag;
   56         struct i2c_controller sc_acb2_tag;
   57 };
   58 
   59 /* Supported logical devices description */
   60 static const struct {
   61         const char *ld_name;
   62         int ld_num;
   63         int ld_iosize0;
   64         int ld_iosize1;
   65 } gscsio_ld[] = {
   66         { "ACB1", GSCSIO_LDN_ACB1, 6, 0 },
   67         { "ACB2", GSCSIO_LDN_ACB2, 6, 0 },
   68 };
   69 
   70 int     gscsio_probe(struct device *, void *, void *);
   71 void    gscsio_attach(struct device *, struct device *, void *);
   72 
   73 void    gscsio_acb_init(struct gscsio_acb *, i2c_tag_t);
   74 int     gscsio_acb_wait(struct gscsio_acb *, int, int);
   75 void    gscsio_acb_reset(struct gscsio_acb *acb);
   76 
   77 int     gscsio_acb_acquire_bus(void *, int);
   78 void    gscsio_acb_release_bus(void *, int);
   79 int     gscsio_acb_send_start(void *, int);
   80 int     gscsio_acb_send_stop(void *, int);
   81 int     gscsio_acb_initiate_xfer(void *, uint16_t, int);
   82 int     gscsio_acb_read_byte(void *, uint8_t *, int);
   83 int     gscsio_acb_write_byte(void *, uint8_t, int);
   84 
   85 struct cfattach gscsio_ca = {
   86         sizeof(struct gscsio_softc),
   87         gscsio_probe,
   88         gscsio_attach
   89 };
   90 
   91 struct cfdriver gscsio_cd = {
   92         NULL, "gscsio", DV_DULL
   93 };
   94 
   95 #define ACB_READ(reg) \
   96         bus_space_read_1(sc->sc_iot, acb->ioh, (reg))
   97 #define ACB_WRITE(reg, val) \
   98         bus_space_write_1(sc->sc_iot, acb->ioh, (reg), (val))
   99 
  100 static __inline u_int8_t
  101 idxread(bus_space_tag_t iot, bus_space_handle_t ioh, int idx)
  102 {
  103         bus_space_write_1(iot, ioh, GSCSIO_IDX, idx);
  104 
  105         return (bus_space_read_1(iot, ioh, GSCSIO_DAT));
  106 }
  107 
  108 static __inline void
  109 idxwrite(bus_space_tag_t iot, bus_space_handle_t ioh, int idx, u_int8_t data)
  110 {
  111         bus_space_write_1(iot, ioh, GSCSIO_IDX, idx);
  112         bus_space_write_1(iot, ioh, GSCSIO_DAT, data);
  113 }
  114 
  115 int
  116 gscsio_probe(struct device *parent, void *match, void *aux)
  117 {
  118         struct isa_attach_args *ia = aux;
  119         bus_space_tag_t iot;
  120         bus_space_handle_t ioh;
  121         int iobase;
  122         int rv = 0;
  123 
  124         iot = ia->ia_iot;
  125         iobase = ia->ipa_io[0].base;
  126         if (bus_space_map(iot, iobase, GSCSIO_IOSIZE, 0, &ioh))
  127                 return (0);
  128         if (idxread(iot, ioh, GSCSIO_ID) == GSCSIO_ID_SC1100)
  129                 rv = 1;
  130         bus_space_unmap(iot, ioh, GSCSIO_IOSIZE);
  131 
  132         if (rv) {
  133                 ia->ipa_nio = 1;
  134                 ia->ipa_io[0].length = GSCSIO_IOSIZE;
  135                 ia->ipa_nmem = 0;
  136                 ia->ipa_nirq = 0;
  137                 ia->ipa_ndrq = 0;
  138         }
  139 
  140         return (rv);
  141 }
  142 
  143 void
  144 gscsio_attach(struct device *parent, struct device *self, void *aux)
  145 {
  146         struct gscsio_softc *sc = (void *)self;
  147         struct isa_attach_args *ia = aux;
  148         int i;
  149         int iobase;
  150 
  151         sc->sc_iot = ia->ia_iot;
  152         if (bus_space_map(sc->sc_iot, ia->ipa_io[0].base, GSCSIO_IOSIZE,
  153             0, &sc->sc_ioh)) {
  154                 printf(": can't map I/O space\n");
  155                 return;
  156         }
  157         printf(": SC1100 SIO rev %d:",
  158             idxread(sc->sc_iot, sc->sc_ioh, GSCSIO_REV));
  159 
  160         /* Configure all supported logical devices */
  161         for (i = 0; i < sizeof (gscsio_ld) / sizeof(gscsio_ld[0]); i++) {
  162                 sc->sc_ld_en[gscsio_ld[i].ld_num] = 0;
  163 
  164                 /* Select the device and check if it's activated */
  165                 idxwrite(sc->sc_iot, sc->sc_ioh, GSCSIO_LDN,
  166                     gscsio_ld[i].ld_num);
  167                 if ((idxread(sc->sc_iot, sc->sc_ioh, GSCSIO_ACT) &
  168                     GSCSIO_ACT_EN) == 0)
  169                         continue;
  170 
  171                 /* Map I/O space 0 if necessary */
  172                 if (gscsio_ld[i].ld_iosize0 != 0) {
  173                         iobase = idxread(sc->sc_iot, sc->sc_ioh,
  174                             GSCSIO_IO0_MSB);
  175                         iobase <<= 8;
  176                         iobase |= idxread(sc->sc_iot, sc->sc_ioh,
  177                             GSCSIO_IO0_LSB);
  178                         if (bus_space_map(sc->sc_iot, iobase,
  179                             gscsio_ld[i].ld_iosize0, 0,
  180                             &sc->sc_ld_ioh0[gscsio_ld[i].ld_num]))
  181                                 continue;
  182                 }
  183 
  184                 /* Map I/O space 1 if necessary */
  185                 if (gscsio_ld[i].ld_iosize1 != 0) {
  186                         iobase = idxread(sc->sc_iot, sc->sc_ioh,
  187                             GSCSIO_IO1_MSB);
  188                         iobase <<= 8;
  189                         iobase |= idxread(sc->sc_iot, sc->sc_ioh,
  190                             GSCSIO_IO1_LSB);
  191                         if (bus_space_map(sc->sc_iot, iobase,
  192                             gscsio_ld[i].ld_iosize1, 0,
  193                             &sc->sc_ld_ioh0[gscsio_ld[i].ld_num])) {
  194                                 bus_space_unmap(sc->sc_iot,
  195                                     sc->sc_ld_ioh0[gscsio_ld[i].ld_num],
  196                                     gscsio_ld[i].ld_iosize0);
  197                                 continue;
  198                         }
  199                 }
  200 
  201                 sc->sc_ld_en[gscsio_ld[i].ld_num] = 1;
  202                 printf(" %s", gscsio_ld[i].ld_name);
  203         }
  204         printf("\n");
  205 
  206         /* Initialize ACCESS.bus 1 */
  207         if (sc->sc_ld_en[GSCSIO_LDN_ACB1]) {
  208                 sc->sc_acb[0].sc = sc;
  209                 sc->sc_acb[0].ioh = sc->sc_ld_ioh0[GSCSIO_LDN_ACB1];
  210                 rw_init(&sc->sc_acb[0].buslock, "iiclk");
  211                 gscsio_acb_init(&sc->sc_acb[0], &sc->sc_acb1_tag);
  212         }
  213 
  214         /* Initialize ACCESS.bus 2 */
  215         if (sc->sc_ld_en[GSCSIO_LDN_ACB2]) {
  216                 sc->sc_acb[1].sc = sc;
  217                 sc->sc_acb[1].ioh = sc->sc_ld_ioh0[GSCSIO_LDN_ACB2];
  218                 rw_init(&sc->sc_acb[1].buslock, "iiclk");
  219                 gscsio_acb_init(&sc->sc_acb[1], &sc->sc_acb2_tag);
  220         }
  221 }
  222 
  223 void
  224 gscsio_acb_init(struct gscsio_acb *acb, i2c_tag_t tag)
  225 {
  226         struct gscsio_softc *sc = acb->sc;
  227         struct i2cbus_attach_args iba;
  228 
  229         /* Enable ACB and configure clock frequency */
  230         ACB_WRITE(GSCSIO_ACB_CTL2, GSCSIO_ACB_CTL2_EN |
  231             (GSCSIO_ACB_FREQ << GSCSIO_ACB_CTL2_FREQ_SHIFT));
  232 
  233         /* Select polling mode */
  234         ACB_WRITE(GSCSIO_ACB_CTL1, ACB_READ(GSCSIO_ACB_CTL1) &
  235             ~GSCSIO_ACB_CTL1_INTEN);
  236 
  237         /* Disable slave address */
  238         ACB_WRITE(GSCSIO_ACB_ADDR, ACB_READ(GSCSIO_ACB_ADDR) &
  239             ~GSCSIO_ACB_ADDR_SAEN);
  240 
  241         /* Attach I2C framework */
  242         tag->ic_cookie = acb;
  243         tag->ic_acquire_bus = gscsio_acb_acquire_bus;
  244         tag->ic_release_bus = gscsio_acb_release_bus;
  245         tag->ic_send_start = gscsio_acb_send_start;
  246         tag->ic_send_stop = gscsio_acb_send_stop;
  247         tag->ic_initiate_xfer = gscsio_acb_initiate_xfer;
  248         tag->ic_read_byte = gscsio_acb_read_byte;
  249         tag->ic_write_byte = gscsio_acb_write_byte;
  250 
  251         bzero(&iba, sizeof(iba));
  252         iba.iba_name = "iic";
  253         iba.iba_tag = tag;
  254         config_found(&sc->sc_dev, &iba, iicbus_print);
  255 }
  256 
  257 int
  258 gscsio_acb_wait(struct gscsio_acb *acb, int bits, int flags)
  259 {
  260         struct gscsio_softc *sc = acb->sc;
  261         u_int8_t st;
  262         int i;
  263 
  264         for (i = 0; i < 100; i++) {
  265                 st = ACB_READ(GSCSIO_ACB_ST);
  266                 if (st & GSCSIO_ACB_ST_BER) {
  267                         printf("%s: bus error, flags=0x%x\n",
  268                             sc->sc_dev.dv_xname, flags);
  269                         gscsio_acb_reset(acb);
  270                         return (EIO);
  271                 }
  272                 if (st & GSCSIO_ACB_ST_NEGACK) {
  273 #if 0
  274                         printf("%s: negative ack, flags=0x%x\n",
  275                             sc->sc_dev.dv_xname, flags);
  276 #endif
  277                         gscsio_acb_reset(acb);
  278                         return (EIO);
  279                 }
  280                 if ((st & bits) == bits)
  281                         break;
  282                 delay(10);
  283         }
  284         if ((st & bits) != bits) {
  285                 printf("%s: timeout, flags=0x%x\n",
  286                     sc->sc_dev.dv_xname, flags);
  287                 gscsio_acb_reset(acb);
  288                 return (ETIMEDOUT);
  289         }
  290 
  291         return (0);
  292 }
  293 
  294 void
  295 gscsio_acb_reset(struct gscsio_acb *acb)
  296 {
  297         struct gscsio_softc *sc = acb->sc;
  298         u_int8_t st, ctl;
  299 
  300         /* Clear MASTER, NEGACK and BER */
  301         st = ACB_READ(GSCSIO_ACB_ST);
  302         st |= GSCSIO_ACB_ST_MASTER | GSCSIO_ACB_ST_NEGACK | GSCSIO_ACB_ST_BER;
  303         ACB_WRITE(GSCSIO_ACB_ST, st);
  304 
  305         /* Disable and re-enable ACB */
  306         ACB_WRITE(GSCSIO_ACB_CTL2, 0);
  307         ACB_WRITE(GSCSIO_ACB_CTL2, GSCSIO_ACB_CTL2_EN |
  308             (GSCSIO_ACB_FREQ << GSCSIO_ACB_CTL2_FREQ_SHIFT));
  309 
  310         /* Send stop */
  311         ctl = ACB_READ(GSCSIO_ACB_CTL1);
  312         ctl |= GSCSIO_ACB_CTL1_STOP;
  313         ACB_WRITE(GSCSIO_ACB_CTL1, ctl);
  314 }
  315 
  316 int
  317 gscsio_acb_acquire_bus(void *cookie, int flags)
  318 {
  319         struct gscsio_acb *acb = cookie;
  320 
  321         if (cold || flags & I2C_F_POLL)
  322                 return (0);
  323 
  324         return (rw_enter(&acb->buslock, RW_WRITE | RW_INTR));
  325 }
  326 
  327 void
  328 gscsio_acb_release_bus(void *cookie, int flags)
  329 {
  330         struct gscsio_acb *acb = cookie;
  331 
  332         if (cold || flags & I2C_F_POLL)
  333                 return;
  334 
  335         rw_exit(&acb->buslock);
  336 }
  337 
  338 int
  339 gscsio_acb_send_start(void *cookie, int flags)
  340 {
  341         struct gscsio_acb *acb = cookie;
  342         struct gscsio_softc *sc = acb->sc;
  343         u_int8_t ctl;
  344 
  345         ctl = ACB_READ(GSCSIO_ACB_CTL1);
  346         ctl |= GSCSIO_ACB_CTL1_START;
  347         ACB_WRITE(GSCSIO_ACB_CTL1, ctl);
  348 
  349         return (0);
  350 }
  351 
  352 int
  353 gscsio_acb_send_stop(void *cookie, int flags)
  354 {
  355         struct gscsio_acb *acb = cookie;
  356         struct gscsio_softc *sc = acb->sc;
  357         u_int8_t ctl;
  358 
  359         ctl = ACB_READ(GSCSIO_ACB_CTL1);
  360         ctl |= GSCSIO_ACB_CTL1_STOP;
  361         ACB_WRITE(GSCSIO_ACB_CTL1, ctl);
  362 
  363         return (0);
  364 }
  365 
  366 int
  367 gscsio_acb_initiate_xfer(void *cookie, uint16_t addr, int flags)
  368 {
  369         struct gscsio_acb *acb = cookie;
  370         struct gscsio_softc *sc = acb->sc;
  371         u_int8_t ctl;
  372         int dir;
  373         int error;
  374 
  375         /* Issue start condition */
  376         ctl = ACB_READ(GSCSIO_ACB_CTL1);
  377         ctl |= GSCSIO_ACB_CTL1_START;
  378         ACB_WRITE(GSCSIO_ACB_CTL1, ctl);
  379 
  380         /* Wait for bus mastership */
  381         if ((error = gscsio_acb_wait(acb,
  382             GSCSIO_ACB_ST_MASTER | GSCSIO_ACB_ST_SDAST, flags)))
  383                 return (error);
  384 
  385         /* Send address byte */
  386         dir = (flags & I2C_F_READ ? 1 : 0);
  387         ACB_WRITE(GSCSIO_ACB_SDA, (addr << 1) | dir);
  388 
  389         return (0);
  390 }
  391 
  392 int
  393 gscsio_acb_read_byte(void *cookie, uint8_t *bytep, int flags)
  394 {
  395         struct gscsio_acb *acb = cookie;
  396         struct gscsio_softc *sc = acb->sc;
  397         u_int8_t ctl;
  398         int error;
  399 
  400         /* Wait for the bus to be ready */
  401         if ((error = gscsio_acb_wait(acb, GSCSIO_ACB_ST_SDAST, flags)))
  402                 return (error);
  403 
  404         /* Acknowledge the last byte */
  405         if (flags & I2C_F_LAST) {
  406                 ctl = ACB_READ(GSCSIO_ACB_CTL1);
  407                 ctl |= GSCSIO_ACB_CTL1_ACK;
  408                 ACB_WRITE(GSCSIO_ACB_CTL1, ctl);
  409         }
  410 
  411         /* Read data byte */
  412         *bytep = ACB_READ(GSCSIO_ACB_SDA);
  413 
  414         return (0);
  415 }
  416 
  417 int
  418 gscsio_acb_write_byte(void *cookie, uint8_t byte, int flags)
  419 {
  420         struct gscsio_acb *acb = cookie;
  421         struct gscsio_softc *sc = acb->sc;
  422         u_int8_t ctl;
  423         int error;
  424 
  425         /* Wait for the bus to be ready */
  426         if ((error = gscsio_acb_wait(acb, GSCSIO_ACB_ST_SDAST, flags)))
  427                 return (error);
  428 
  429         /* Send stop after the last byte */
  430         if (flags & I2C_F_STOP) {
  431                 ctl = ACB_READ(GSCSIO_ACB_CTL1);
  432                 ctl |= GSCSIO_ACB_CTL1_STOP;
  433                 ACB_WRITE(GSCSIO_ACB_CTL1, ctl);
  434         }
  435 
  436         /* Write data byte */
  437         ACB_WRITE(GSCSIO_ACB_SDA, byte);
  438 
  439         return (0);
  440 }

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