3 * Ben Gray <ben.r.gray@gmail.com>.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
32 * Texas Instruments TWL4030/TWL5030/TWL60x0/TPS659x0 Power Management and
33 * Audio CODEC devices.
35 * This code is based on the Linux TWL multifunctional device driver, which is
36 * copyright (C) 2005-2006 Texas Instruments, Inc.
38 * These chips are typically used as support ICs for the OMAP range of embedded
39 * ARM processes/SOC from Texas Instruments. They are typically used to control
40 * on board voltages, however some variants have other features like audio
41 * codecs, USB OTG transceivers, RTC, PWM, etc.
43 * This driver acts as a bus for more specific companion devices.
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
51 #include <sys/module.h>
53 #include <sys/resource.h>
55 #include <sys/sysctl.h>
56 #include <sys/mutex.h>
57 #include <sys/malloc.h>
59 #include <machine/bus.h>
60 #include <machine/resource.h>
61 #include <machine/intr.h>
63 #include <dev/iicbus/iicbus.h>
64 #include <dev/iicbus/iiconf.h>
66 #include <dev/ofw/openfirm.h>
67 #include <dev/ofw/ofw_bus.h>
68 #include <dev/ofw/ofw_bus_subr.h>
70 #include "arm/ti/twl/twl.h"
73 #define TWL_DEVICE_UNKNOWN 0xffff
74 #define TWL_DEVICE_4030 0x4030
75 #define TWL_DEVICE_6025 0x6025
76 #define TWL_DEVICE_6030 0x6030
78 /* Each TWL device typically has more than one I2C address */
79 #define TWL_MAX_SUBADDRS 4
81 /* The maxium number of bytes that can be written in one call */
82 #define TWL_MAX_IIC_DATA_SIZE 63
84 /* The TWL devices typically use 4 I2C address for the different internal
85 * register sets, plus one SmartReflex I2C address.
87 #define TWL_CHIP_ID0 0x48
88 #define TWL_CHIP_ID1 0x49
89 #define TWL_CHIP_ID2 0x4A
90 #define TWL_CHIP_ID3 0x4B
92 #define TWL_SMARTREFLEX_CHIP_ID 0x12
94 #define TWL_INVALID_CHIP_ID 0xff
101 uint8_t sc_subaddr_map[TWL_MAX_SUBADDRS];
103 struct intr_config_hook sc_scan_hook;
110 * Macros for driver mutex locking
112 #define TWL_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
113 #define TWL_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
114 #define TWL_LOCK_INIT(_sc) \
115 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \
117 #define TWL_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
118 #define TWL_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
119 #define TWL_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
123 * twl_is_4030 - returns true if the device is TWL4030
124 * twl_is_6025 - returns true if the device is TWL6025
125 * twl_is_6030 - returns true if the device is TWL6030
126 * @sc: device soft context
128 * Returns a non-zero value if the device matches.
131 * Returns a non-zero value if the device matches, otherwise zero.
134 twl_is_4030(device_t dev)
136 struct twl_softc *sc = device_get_softc(dev);
137 return (sc->sc_type == TWL_DEVICE_4030);
141 twl_is_6025(device_t dev)
143 struct twl_softc *sc = device_get_softc(dev);
144 return (sc->sc_type == TWL_DEVICE_6025);
148 twl_is_6030(device_t dev)
150 struct twl_softc *sc = device_get_softc(dev);
151 return (sc->sc_type == TWL_DEVICE_6030);
156 * twl_read - read one or more registers from the TWL device
157 * @sc: device soft context
158 * @nsub: the sub-module to read from
159 * @reg: the register offset within the module to read
160 * @buf: buffer to store the bytes in
161 * @cnt: the number of bytes to read
163 * Reads one or more registers and stores the result in the suppled buffer.
166 * Zero on success or an error code on failure.
169 twl_read(device_t dev, uint8_t nsub, uint8_t reg, uint8_t *buf, uint16_t cnt)
171 struct twl_softc *sc;
172 struct iic_msg msg[2];
176 sc = device_get_softc(dev);
179 addr = sc->sc_subaddr_map[nsub];
182 if (addr == TWL_INVALID_CHIP_ID)
186 /* Set the address to read from */
188 msg[0].flags = IIC_M_WR | IIC_M_NOSTOP;
191 /* Read the data back */
193 msg[1].flags = IIC_M_RD;
197 rc = iicbus_transfer(dev, msg, 2);
199 device_printf(dev, "iicbus read failed (adr:0x%02x, reg:0x%02x)\n",
208 * twl_write - writes one or more registers to the TWL device
209 * @sc: device soft context
210 * @nsub: the sub-module to read from
211 * @reg: the register offset within the module to read
212 * @buf: data to write
213 * @cnt: the number of bytes to write
215 * Writes one or more registers.
218 * Zero on success or a negative error code on failure.
221 twl_write(device_t dev, uint8_t nsub, uint8_t reg, uint8_t *buf, uint16_t cnt)
223 struct twl_softc *sc;
226 uint8_t tmp_buf[TWL_MAX_IIC_DATA_SIZE + 1];
229 if (cnt > TWL_MAX_IIC_DATA_SIZE)
232 /* Set the register address as the first byte */
234 memcpy(&tmp_buf[1], buf, cnt);
236 sc = device_get_softc(dev);
239 addr = sc->sc_subaddr_map[nsub];
242 if (addr == TWL_INVALID_CHIP_ID)
246 /* Setup the transfer and execute it */
248 msg.flags = IIC_M_WR;
252 rc = iicbus_transfer(dev, &msg, 1);
254 device_printf(sc->sc_dev, "iicbus write failed (adr:0x%02x, reg:0x%02x)\n",
263 * twl_test_present - checks if a device with given address is present
264 * @sc: device soft context
265 * @addr: the address of the device to scan for
267 * Sends just the address byte and checks for an ACK. If no ACK then device
268 * is assumed to not be present.
271 * EIO if device is not present, otherwise 0 is returned.
274 twl_test_present(struct twl_softc *sc, uint8_t addr)
279 /* Set the address to read from */
281 msg.flags = IIC_M_RD;
285 if (iicbus_transfer(sc->sc_dev, &msg, 1) != 0)
292 * twl_scan - scans the i2c bus for sub modules
293 * @dev: the twl device
295 * TWL devices don't just have one i2c slave address, rather they have up to
296 * 5 other addresses, each is for separate modules within the device. This
297 * function scans the bus for 4 possible sub-devices and stores the info
304 struct twl_softc *sc;
306 uint8_t devs[TWL_MAX_SUBADDRS];
307 uint8_t base = TWL_CHIP_ID0;
309 sc = device_get_softc((device_t)dev);
311 memset(devs, TWL_INVALID_CHIP_ID, TWL_MAX_SUBADDRS);
313 /* Try each of the addresses (0x48, 0x49, 0x4a & 0x4b) to determine which
314 * sub modules we have.
316 for (i = 0; i < TWL_MAX_SUBADDRS; i++) {
317 if (twl_test_present(sc, (base + i)) == 0) {
318 devs[i] = (base + i);
319 device_printf(sc->sc_dev, "Found (sub)device at 0x%02x\n", (base + i));
324 memcpy(sc->sc_subaddr_map, devs, TWL_MAX_SUBADDRS);
327 /* Finished with the interrupt hook */
328 config_intrhook_disestablish(&sc->sc_scan_hook);
333 * @dev: the twl device
335 * Scans the FDT for a match for the device, possible compatible device
336 * strings are; "ti,twl6030", "ti,twl6025", "ti,twl4030".
338 * The FDT compat string also determines the type of device (it is currently
339 * not possible to dynamically determine the device type).
343 twl_probe(device_t dev)
348 struct twl_softc *sc;
350 if ((compat = ofw_bus_get_compat(dev)) == NULL)
353 if ((node = ofw_bus_get_node(dev)) == 0)
356 /* Get total 'compatible' prop len */
357 if ((len = OF_getproplen(node, "compatible")) <= 0)
360 sc = device_get_softc(dev);
362 sc->sc_type = TWL_DEVICE_UNKNOWN;
365 if (strncasecmp(compat, "ti,twl6030", 10) == 0)
366 sc->sc_type = TWL_DEVICE_6030;
367 else if (strncasecmp(compat, "ti,twl6025", 10) == 0)
368 sc->sc_type = TWL_DEVICE_6025;
369 else if (strncasecmp(compat, "ti,twl4030", 10) == 0)
370 sc->sc_type = TWL_DEVICE_4030;
372 if (sc->sc_type != TWL_DEVICE_UNKNOWN)
375 /* Slide to the next sub-string. */
376 l = strlen(compat) + 1;
381 switch (sc->sc_type) {
382 case TWL_DEVICE_4030:
383 device_set_desc(dev, "TI TWL4030/TPS659x0 Companion IC");
385 case TWL_DEVICE_6025:
386 device_set_desc(dev, "TI TWL6025 Companion IC");
388 case TWL_DEVICE_6030:
389 device_set_desc(dev, "TI TWL6030 Companion IC");
391 case TWL_DEVICE_UNKNOWN:
400 twl_attach(device_t dev)
402 struct twl_softc *sc;
404 sc = device_get_softc(dev);
409 /* We have to wait until interrupts are enabled. I2C read and write
410 * only works if the interrupts are available.
412 sc->sc_scan_hook.ich_func = twl_scan;
413 sc->sc_scan_hook.ich_arg = dev;
415 if (config_intrhook_establish(&sc->sc_scan_hook) != 0)
418 /* FIXME: should be in DTS file */
419 if ((sc->sc_vreg = device_add_child(dev, "twl_vreg", -1)) == NULL)
420 device_printf(dev, "could not allocate twl_vreg instance\n");
421 if ((sc->sc_clks = device_add_child(dev, "twl_clks", -1)) == NULL)
422 device_printf(dev, "could not allocate twl_clks instance\n");
424 return (bus_generic_attach(dev));
428 twl_detach(device_t dev)
430 struct twl_softc *sc;
432 sc = device_get_softc(dev);
435 device_delete_child(dev, sc->sc_vreg);
437 device_delete_child(dev, sc->sc_clks);
440 TWL_LOCK_DESTROY(sc);
445 static device_method_t twl_methods[] = {
446 DEVMETHOD(device_probe, twl_probe),
447 DEVMETHOD(device_attach, twl_attach),
448 DEVMETHOD(device_detach, twl_detach),
453 static driver_t twl_driver = {
456 sizeof(struct twl_softc),
458 static devclass_t twl_devclass;
460 DRIVER_MODULE(twl, iicbus, twl_driver, twl_devclass, 0, 0);
461 MODULE_VERSION(twl, 1);