2 * Copyright (c) 1998, 2001 Nicolas Souchu
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 * I2C support for the bti2c chipset.
33 * From brooktree848.c <fsmp@freefall.org>
38 #include <sys/param.h>
39 #include <sys/kernel.h>
40 #include <sys/malloc.h>
41 #include <sys/systm.h>
42 #include <sys/module.h>
46 #if __FreeBSD_version < 500014
47 #include <sys/select.h>
49 #include <sys/selinfo.h>
52 #if (__FreeBSD_version < 500000)
53 #include <machine/clock.h> /* for DELAY */
54 #include <pci/pcivar.h>
55 #include <pci/pcireg.h>
57 #include <dev/pci/pcivar.h>
58 #include <dev/pci/pcireg.h>
61 #include <machine/bus.h>
64 #include <dev/bktr/ioctl_meteor.h>
65 #include <dev/bktr/ioctl_bt848.h> /* extensions to ioctl_meteor.h */
66 #include <dev/bktr/bktr_reg.h>
67 #include <dev/bktr/bktr_i2c.h>
69 #include <dev/smbus/smbconf.h>
70 #include <dev/iicbus/iiconf.h>
74 /* Compilation is void if BKTR_USE_FREEBSD_SMBUS is not
75 * defined. This allows bktr owners to have smbus active for there
76 * motherboard and still use their bktr without smbus.
78 #if defined(BKTR_USE_FREEBSD_SMBUS)
80 #define BTI2C_DEBUG(x) if (bti2c_debug) (x)
81 static int bti2c_debug = 0;
84 * Call this to pass the address of the bktr device to the
85 * bti2c_i2c layer and initialize all the I2C bus architecture
87 int bt848_i2c_attach(device_t dev)
89 struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
90 struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
92 sc->smbus = device_add_child(dev, "smbus", -1);
93 sc->iicbb = device_add_child(dev, "iicbb", -1);
95 if (!sc->iicbb || !sc->smbus)
98 bus_generic_attach(dev);
103 int bt848_i2c_detach(device_t dev)
105 struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
106 struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
109 if ((error = bus_generic_detach(dev)))
112 if (sc->iicbb && (error = device_delete_child(dev, sc->iicbb)))
115 if (sc->smbus && (error = device_delete_child(dev, sc->smbus)))
122 int bti2c_smb_callback(device_t dev, int index, caddr_t *data)
124 struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
125 struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
128 /* test each time if we already have/haven't the iicbus
132 case SMB_REQUEST_BUS:
134 if (!sc->bus_owned) {
140 case SMB_RELEASE_BUS:
155 int bti2c_iic_callback(device_t dev, int index, caddr_t *data)
157 struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
158 struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
161 /* test each time if we already have/haven't the smbus
165 case IIC_REQUEST_BUS:
167 if (!sc->bus_owned) {
173 case IIC_RELEASE_BUS:
188 int bti2c_iic_reset(device_t dev, u_char speed, u_char addr, u_char * oldaddr)
191 *oldaddr = 0; /* XXX */
193 return (IIC_ENOADDR);
196 void bti2c_iic_setsda(device_t dev, int val)
198 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
201 clock = INL(sc, BKTR_I2C_DATA_CTL) & 0x2;
204 OUTL(sc, BKTR_I2C_DATA_CTL, clock | 1);
206 OUTL(sc, BKTR_I2C_DATA_CTL, clock);
213 void bti2c_iic_setscl(device_t dev, int val)
215 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
218 data = INL(sc, BKTR_I2C_DATA_CTL) & 0x1;
221 OUTL(sc, BKTR_I2C_DATA_CTL, 0x2 | data);
223 OUTL(sc, BKTR_I2C_DATA_CTL, data);
231 bti2c_iic_getsda(device_t dev)
233 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
235 return (INL(sc,BKTR_I2C_DATA_CTL) & 0x1);
239 bti2c_iic_getscl(device_t dev)
245 bti2c_write(struct bktr_softc *sc, u_long data)
249 /* clear status bits */
250 OUTL(sc, BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
252 BTI2C_DEBUG(printf("w%lx", data));
254 /* write the address and data */
255 OUTL(sc, BKTR_I2C_DATA_CTL, data);
257 /* wait for completion */
258 for ( x = 0x7fffffff; x; --x ) { /* safety valve */
259 if ( INL(sc, BKTR_INT_STAT) & BT848_INT_I2CDONE )
264 if ( !x || !( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK) ) {
265 BTI2C_DEBUG(printf("%c%c", (!x)?'+':'-',
266 (!( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
269 BTI2C_DEBUG(printf("+"));
276 bti2c_smb_writeb(device_t dev, u_char slave, char cmd, char byte)
278 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
281 data = ((slave & 0xff) << 24) | ((byte & 0xff) << 16) | (u_char)cmd;
283 return (bti2c_write(sc, data));
287 * byte1 becomes low byte of word
288 * byte2 becomes high byte of word
291 bti2c_smb_writew(device_t dev, u_char slave, char cmd, short word)
293 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
297 low = (char)(word & 0xff);
298 high = (char)((word & 0xff00) >> 8);
300 data = ((slave & 0xff) << 24) | ((low & 0xff) << 16) |
301 ((high & 0xff) << 8) | BT848_DATA_CTL_I2CW3B | (u_char)cmd;
303 return (bti2c_write(sc, data));
307 * The Bt878 and Bt879 differed on the treatment of i2c commands
310 bti2c_smb_readb(device_t dev, u_char slave, char cmd, char *byte)
312 struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
315 /* clear status bits */
316 OUTL(sc,BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
318 OUTL(sc,BKTR_I2C_DATA_CTL, ((slave & 0xff) << 24) | (u_char)cmd);;
320 BTI2C_DEBUG(printf("r%lx/", (u_long)(((slave & 0xff) << 24) | (u_char)cmd)));
322 /* wait for completion */
323 for ( x = 0x7fffffff; x; --x ) { /* safety valve */
324 if ( INL(sc,BKTR_INT_STAT) & BT848_INT_I2CDONE )
329 if ( !x || !(INL(sc,BKTR_INT_STAT) & BT848_INT_RACK) ) {
330 BTI2C_DEBUG(printf("r%c%c", (!x)?'+':'-',
331 (!( INL(sc,BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
335 *byte = (char)((INL(sc,BKTR_I2C_DATA_CTL) >> 8) & 0xff);
336 BTI2C_DEBUG(printf("r%x+", *byte));
341 #endif /* defined(BKTR_USE_FREEBSD_SMBUS) */