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/cpu.h>
61 #include <machine/cpufunc.h>
62 #include <machine/frame.h>
63 #include <machine/resource.h>
64 #include <machine/intr.h>
66 #include <dev/iicbus/iicbus.h>
67 #include <dev/iicbus/iiconf.h>
69 #include <dev/ofw/openfirm.h>
70 #include <dev/ofw/ofw_bus.h>
71 #include <dev/ofw/ofw_bus_subr.h>
73 #include "arm/ti/twl/twl.h"
76 #define TWL_DEVICE_UNKNOWN 0xffff
77 #define TWL_DEVICE_4030 0x4030
78 #define TWL_DEVICE_6025 0x6025
79 #define TWL_DEVICE_6030 0x6030
81 /* Each TWL device typically has more than one I2C address */
82 #define TWL_MAX_SUBADDRS 4
84 /* The maxium number of bytes that can be written in one call */
85 #define TWL_MAX_IIC_DATA_SIZE 63
87 /* The TWL devices typically use 4 I2C address for the different internal
88 * register sets, plus one SmartReflex I2C address.
90 #define TWL_CHIP_ID0 0x48
91 #define TWL_CHIP_ID1 0x49
92 #define TWL_CHIP_ID2 0x4A
93 #define TWL_CHIP_ID3 0x4B
95 #define TWL_SMARTREFLEX_CHIP_ID 0x12
97 #define TWL_INVALID_CHIP_ID 0xff
102 unsigned int sc_type;
104 uint8_t sc_subaddr_map[TWL_MAX_SUBADDRS];
106 struct intr_config_hook sc_scan_hook;
113 * Macros for driver mutex locking
115 #define TWL_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
116 #define TWL_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
117 #define TWL_LOCK_INIT(_sc) \
118 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \
120 #define TWL_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
121 #define TWL_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
122 #define TWL_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
126 * twl_is_4030 - returns true if the device is TWL4030
127 * twl_is_6025 - returns true if the device is TWL6025
128 * twl_is_6030 - returns true if the device is TWL6030
129 * @sc: device soft context
131 * Returns a non-zero value if the device matches.
134 * Returns a non-zero value if the device matches, otherwise zero.
137 twl_is_4030(device_t dev)
139 struct twl_softc *sc = device_get_softc(dev);
140 return (sc->sc_type == TWL_DEVICE_4030);
144 twl_is_6025(device_t dev)
146 struct twl_softc *sc = device_get_softc(dev);
147 return (sc->sc_type == TWL_DEVICE_6025);
151 twl_is_6030(device_t dev)
153 struct twl_softc *sc = device_get_softc(dev);
154 return (sc->sc_type == TWL_DEVICE_6030);
159 * twl_read - read one or more registers from the TWL device
160 * @sc: device soft context
161 * @nsub: the sub-module to read from
162 * @reg: the register offset within the module to read
163 * @buf: buffer to store the bytes in
164 * @cnt: the number of bytes to read
166 * Reads one or more registers and stores the result in the suppled buffer.
169 * Zero on success or an error code on failure.
172 twl_read(device_t dev, uint8_t nsub, uint8_t reg, uint8_t *buf, uint16_t cnt)
174 struct twl_softc *sc;
175 struct iic_msg msg[2];
179 sc = device_get_softc(dev);
182 addr = sc->sc_subaddr_map[nsub];
185 if (addr == TWL_INVALID_CHIP_ID)
189 /* Set the address to read from */
191 msg[0].flags = IIC_M_WR | IIC_M_NOSTOP;
194 /* Read the data back */
196 msg[1].flags = IIC_M_RD;
200 rc = iicbus_transfer(dev, msg, 2);
202 device_printf(dev, "iicbus read failed (adr:0x%02x, reg:0x%02x)\n",
211 * twl_write - writes one or more registers to the TWL device
212 * @sc: device soft context
213 * @nsub: the sub-module to read from
214 * @reg: the register offset within the module to read
215 * @buf: data to write
216 * @cnt: the number of bytes to write
218 * Writes one or more registers.
221 * Zero on success or a negative error code on failure.
224 twl_write(device_t dev, uint8_t nsub, uint8_t reg, uint8_t *buf, uint16_t cnt)
226 struct twl_softc *sc;
229 uint8_t tmp_buf[TWL_MAX_IIC_DATA_SIZE + 1];
232 if (cnt > TWL_MAX_IIC_DATA_SIZE)
235 /* Set the register address as the first byte */
237 memcpy(&tmp_buf[1], buf, cnt);
239 sc = device_get_softc(dev);
242 addr = sc->sc_subaddr_map[nsub];
245 if (addr == TWL_INVALID_CHIP_ID)
249 /* Setup the transfer and execute it */
251 msg.flags = IIC_M_WR;
255 rc = iicbus_transfer(dev, &msg, 1);
257 device_printf(sc->sc_dev, "iicbus write failed (adr:0x%02x, reg:0x%02x)\n",
266 * twl_test_present - checks if a device with given address is present
267 * @sc: device soft context
268 * @addr: the address of the device to scan for
270 * Sends just the address byte and checks for an ACK. If no ACK then device
271 * is assumed to not be present.
274 * EIO if device is not present, otherwise 0 is returned.
277 twl_test_present(struct twl_softc *sc, uint8_t addr)
282 /* Set the address to read from */
284 msg.flags = IIC_M_RD;
288 if (iicbus_transfer(sc->sc_dev, &msg, 1) != 0)
295 * twl_scan - scans the i2c bus for sub modules
296 * @dev: the twl device
298 * TWL devices don't just have one i2c slave address, rather they have up to
299 * 5 other addresses, each is for separate modules within the device. This
300 * function scans the bus for 4 possible sub-devices and stores the info
307 struct twl_softc *sc;
309 uint8_t devs[TWL_MAX_SUBADDRS];
310 uint8_t base = TWL_CHIP_ID0;
312 sc = device_get_softc((device_t)dev);
314 memset(devs, TWL_INVALID_CHIP_ID, TWL_MAX_SUBADDRS);
316 /* Try each of the addresses (0x48, 0x49, 0x4a & 0x4b) to determine which
317 * sub modules we have.
319 for (i = 0; i < TWL_MAX_SUBADDRS; i++) {
320 if (twl_test_present(sc, (base + i)) == 0) {
321 devs[i] = (base + i);
322 device_printf(sc->sc_dev, "Found (sub)device at 0x%02x\n", (base + i));
327 memcpy(sc->sc_subaddr_map, devs, TWL_MAX_SUBADDRS);
330 /* Finished with the interrupt hook */
331 config_intrhook_disestablish(&sc->sc_scan_hook);
336 * @dev: the twl device
338 * Scans the FDT for a match for the device, possible compatible device
339 * strings are; "ti,twl6030", "ti,twl6025", "ti,twl4030".
341 * The FDT compat string also determines the type of device (it is currently
342 * not possible to dynamically determine the device type).
346 twl_probe(device_t dev)
351 struct twl_softc *sc;
353 if ((compat = ofw_bus_get_compat(dev)) == NULL)
356 if ((node = ofw_bus_get_node(dev)) == 0)
359 /* Get total 'compatible' prop len */
360 if ((len = OF_getproplen(node, "compatible")) <= 0)
363 sc = device_get_softc(dev);
365 sc->sc_type = TWL_DEVICE_UNKNOWN;
368 if (strncasecmp(compat, "ti,twl6030", 10) == 0)
369 sc->sc_type = TWL_DEVICE_6030;
370 else if (strncasecmp(compat, "ti,twl6025", 10) == 0)
371 sc->sc_type = TWL_DEVICE_6025;
372 else if (strncasecmp(compat, "ti,twl4030", 10) == 0)
373 sc->sc_type = TWL_DEVICE_4030;
375 if (sc->sc_type != TWL_DEVICE_UNKNOWN)
378 /* Slide to the next sub-string. */
379 l = strlen(compat) + 1;
384 switch (sc->sc_type) {
385 case TWL_DEVICE_4030:
386 device_set_desc(dev, "TI TWL4030/TPS659x0 Companion IC");
388 case TWL_DEVICE_6025:
389 device_set_desc(dev, "TI TWL6025 Companion IC");
391 case TWL_DEVICE_6030:
392 device_set_desc(dev, "TI TWL6030 Companion IC");
394 case TWL_DEVICE_UNKNOWN:
403 twl_attach(device_t dev)
405 struct twl_softc *sc;
407 sc = device_get_softc(dev);
412 /* We have to wait until interrupts are enabled. I2C read and write
413 * only works if the interrupts are available.
415 sc->sc_scan_hook.ich_func = twl_scan;
416 sc->sc_scan_hook.ich_arg = dev;
418 if (config_intrhook_establish(&sc->sc_scan_hook) != 0)
421 /* FIXME: should be in DTS file */
422 if ((sc->sc_vreg = device_add_child(dev, "twl_vreg", -1)) == NULL)
423 device_printf(dev, "could not allocate twl_vreg instance\n");
424 if ((sc->sc_clks = device_add_child(dev, "twl_clks", -1)) == NULL)
425 device_printf(dev, "could not allocate twl_clks instance\n");
427 return (bus_generic_attach(dev));
431 twl_detach(device_t dev)
433 struct twl_softc *sc;
435 sc = device_get_softc(dev);
438 device_delete_child(dev, sc->sc_vreg);
440 device_delete_child(dev, sc->sc_clks);
443 TWL_LOCK_DESTROY(sc);
448 static device_method_t twl_methods[] = {
449 DEVMETHOD(device_probe, twl_probe),
450 DEVMETHOD(device_attach, twl_attach),
451 DEVMETHOD(device_detach, twl_detach),
456 static driver_t twl_driver = {
459 sizeof(struct twl_softc),
461 static devclass_t twl_devclass;
463 DRIVER_MODULE(twl, iicbus, twl_driver, twl_devclass, 0, 0);
464 MODULE_VERSION(twl, 1);