2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1998, 2001 Nicolas Souchu
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
33 * I2C support for the bti2c chipset.
35 * From brooktree848.c <fsmp@freefall.org>
40 #include <sys/param.h>
41 #include <sys/kernel.h>
42 #include <sys/malloc.h>
43 #include <sys/systm.h>
44 #include <sys/module.h>
48 #if __FreeBSD_version < 500014
49 #include <sys/select.h>
51 #include <sys/selinfo.h>
54 #if (__FreeBSD_version < 500000)
55 #include <pci/pcivar.h>
56 #include <pci/pcireg.h>
58 #include <dev/pci/pcivar.h>
59 #include <dev/pci/pcireg.h>
62 #include <machine/bus.h>
65 #include <dev/bktr/ioctl_meteor.h>
66 #include <dev/bktr/ioctl_bt848.h> /* extensions to ioctl_meteor.h */
67 #include <dev/bktr/bktr_reg.h>
68 #include <dev/bktr/bktr_i2c.h>
70 #include <dev/smbus/smbconf.h>
71 #include <dev/iicbus/iiconf.h>
73 /* Compilation is void if BKTR_USE_FREEBSD_SMBUS is not
74 * defined. This allows bktr owners to have smbus active for there
75 * motherboard and still use their bktr without smbus.
77 #if defined(BKTR_USE_FREEBSD_SMBUS)
79 #define BTI2C_DEBUG(x) if (bti2c_debug) (x)
80 static int bti2c_debug = 0;
83 * Call this to pass the address of the bktr device to the
84 * bti2c_i2c layer and initialize all the I2C bus architecture
86 int bt848_i2c_attach(device_t dev)
88 struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
89 struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
91 sc->smbus = device_add_child(dev, "smbus", -1);
92 sc->iicbb = device_add_child(dev, "iicbb", -1);
94 if (!sc->iicbb || !sc->smbus)
97 bus_generic_attach(dev);
102 int bt848_i2c_detach(device_t dev)
104 struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
105 struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
108 if ((error = bus_generic_detach(dev)))
111 if (sc->iicbb && (error = device_delete_child(dev, sc->iicbb)))
114 if (sc->smbus && (error = device_delete_child(dev, sc->smbus)))
121 int bti2c_smb_callback(device_t dev, int index, void *data)
123 struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
124 struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
127 /* test each time if we already have/haven't the iicbus
131 case SMB_REQUEST_BUS:
134 if (!sc->bus_owned) {
141 case SMB_RELEASE_BUS:
158 int bti2c_iic_callback(device_t dev, int index, caddr_t *data)
160 struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
161 struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
164 /* test each time if we already have/haven't the smbus
168 case IIC_REQUEST_BUS:
171 if (!sc->bus_owned) {
178 case IIC_RELEASE_BUS:
195 int bti2c_iic_reset(device_t dev, u_char speed, u_char addr, u_char * oldaddr)
199 *oldaddr = 0; /* XXX */
202 return (IIC_ENOADDR);
205 void bti2c_iic_setsda(device_t dev, int val)
207 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
211 clock = INL(sc, BKTR_I2C_DATA_CTL) & 0x2;
214 OUTL(sc, BKTR_I2C_DATA_CTL, clock | 1);
216 OUTL(sc, BKTR_I2C_DATA_CTL, clock);
222 void bti2c_iic_setscl(device_t dev, int val)
224 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
228 data = INL(sc, BKTR_I2C_DATA_CTL) & 0x1;
231 OUTL(sc, BKTR_I2C_DATA_CTL, 0x2 | data);
233 OUTL(sc, BKTR_I2C_DATA_CTL, data);
240 bti2c_iic_getsda(device_t dev)
242 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
246 retval = INL(sc,BKTR_I2C_DATA_CTL) & 0x1;
252 bti2c_iic_getscl(device_t dev)
258 bti2c_write(struct bktr_softc *sc, u_long data)
264 /* clear status bits */
265 OUTL(sc, BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
267 BTI2C_DEBUG(printf("w%lx", data));
269 /* write the address and data */
270 OUTL(sc, BKTR_I2C_DATA_CTL, data);
272 /* wait for completion */
273 for ( x = 0x7fffffff; x; --x ) { /* safety valve */
274 if ( INL(sc, BKTR_INT_STAT) & BT848_INT_I2CDONE )
279 if ( !x || !( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK) ) {
280 BTI2C_DEBUG(printf("%c%c", (!x)?'+':'-',
281 (!( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
285 BTI2C_DEBUG(printf("+"));
293 bti2c_smb_writeb(device_t dev, u_char slave, char cmd, char byte)
295 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
298 data = ((slave & 0xff) << 24) | ((byte & 0xff) << 16) | (u_char)cmd;
300 return (bti2c_write(sc, data));
304 * byte1 becomes low byte of word
305 * byte2 becomes high byte of word
308 bti2c_smb_writew(device_t dev, u_char slave, char cmd, short word)
310 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
314 low = (char)(word & 0xff);
315 high = (char)((word & 0xff00) >> 8);
317 data = ((slave & 0xff) << 24) | ((low & 0xff) << 16) |
318 ((high & 0xff) << 8) | BT848_DATA_CTL_I2CW3B | (u_char)cmd;
320 return (bti2c_write(sc, data));
324 * The Bt878 and Bt879 differed on the treatment of i2c commands
327 bti2c_smb_readb(device_t dev, u_char slave, char cmd, char *byte)
329 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
333 /* clear status bits */
334 OUTL(sc,BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
336 OUTL(sc,BKTR_I2C_DATA_CTL, ((slave & 0xff) << 24) | (u_char)cmd);
338 BTI2C_DEBUG(printf("r%lx/", (u_long)(((slave & 0xff) << 24) | (u_char)cmd)));
340 /* wait for completion */
341 for ( x = 0x7fffffff; x; --x ) { /* safety valve */
342 if ( INL(sc,BKTR_INT_STAT) & BT848_INT_I2CDONE )
347 if ( !x || !(INL(sc,BKTR_INT_STAT) & BT848_INT_RACK) ) {
348 BTI2C_DEBUG(printf("r%c%c", (!x)?'+':'-',
349 (!( INL(sc,BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
354 *byte = (char)((INL(sc,BKTR_I2C_DATA_CTL) >> 8) & 0xff);
355 BTI2C_DEBUG(printf("r%x+", *byte));
361 DRIVER_MODULE(iicbb, bktr, iicbb_driver, iicbb_devclass, 0, 0);
362 DRIVER_MODULE(smbus, bktr, smbus_driver, smbus_devclass, 0, 0);
364 #endif /* defined(BKTR_USE_FREEBSD_SMBUS) */