xref: /netbsd-src/sys/arch/hpcarm/dev/nbpiic.c (revision 4066ef2218b7d7a605ca8031f7897395da0a5bb8)
1*4066ef22Sandvar /*	$NetBSD: nbpiic.c,v 1.6 2022/06/18 22:11:00 andvar Exp $ */
2587ef940Skiyohara /*
3587ef940Skiyohara  * Copyright (c) 2011 KIYOHARA Takashi
4587ef940Skiyohara  * All rights reserved.
5587ef940Skiyohara  *
6587ef940Skiyohara  * Redistribution and use in source and binary forms, with or without
7587ef940Skiyohara  * modification, are permitted provided that the following conditions
8587ef940Skiyohara  * are met:
9587ef940Skiyohara  * 1. Redistributions of source code must retain the above copyright
10587ef940Skiyohara  *    notice, this list of conditions and the following disclaimer.
11587ef940Skiyohara  * 2. Redistributions in binary form must reproduce the above copyright
12587ef940Skiyohara  *    notice, this list of conditions and the following disclaimer in the
13587ef940Skiyohara  *    documentation and/or other materials provided with the distribution.
14587ef940Skiyohara  *
15587ef940Skiyohara  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16587ef940Skiyohara  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17587ef940Skiyohara  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18587ef940Skiyohara  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19587ef940Skiyohara  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20587ef940Skiyohara  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21587ef940Skiyohara  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22587ef940Skiyohara  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23587ef940Skiyohara  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
24587ef940Skiyohara  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25587ef940Skiyohara  * POSSIBILITY OF SUCH DAMAGE.
26587ef940Skiyohara  */
27587ef940Skiyohara #include <sys/cdefs.h>
28*4066ef22Sandvar __KERNEL_RCSID(0, "$NetBSD: nbpiic.c,v 1.6 2022/06/18 22:11:00 andvar Exp $");
29587ef940Skiyohara 
30587ef940Skiyohara #include <sys/param.h>
31587ef940Skiyohara #include <sys/device.h>
32587ef940Skiyohara #include <sys/mutex.h>
33587ef940Skiyohara 
34587ef940Skiyohara #include <machine/platid.h>
35587ef940Skiyohara #include <machine/platid_mask.h>
36587ef940Skiyohara 
37587ef940Skiyohara #include <arm/xscale/pxa2x0var.h>
38587ef940Skiyohara #include <arm/xscale/pxa2x0_i2c.h>
39587ef940Skiyohara 
40587ef940Skiyohara #include <hpcarm/dev/nbppconvar.h>
41587ef940Skiyohara 
42587ef940Skiyohara #include <dev/i2c/i2cvar.h>
43587ef940Skiyohara 
44587ef940Skiyohara #include "nbppcon.h"
45587ef940Skiyohara 
46587ef940Skiyohara #define NBPIIC_SLAVE_ADDR	0x70
47587ef940Skiyohara 
48587ef940Skiyohara struct nbpiic_softc {
49587ef940Skiyohara 	struct pxa2x0_i2c_softc sc_pxa_i2c;
50587ef940Skiyohara 
51587ef940Skiyohara 	struct i2c_controller sc_i2c;
52587ef940Skiyohara 	kmutex_t sc_lock;
53587ef940Skiyohara 
54587ef940Skiyohara 	device_t sc_pcon;
55587ef940Skiyohara 	char sc_buf[16];
56587ef940Skiyohara 	int sc_idx;
57587ef940Skiyohara };
58587ef940Skiyohara 
59587ef940Skiyohara 
60587ef940Skiyohara static int pxaiic_match(device_t, cfdata_t, void *);
61587ef940Skiyohara static void pxaiic_attach(device_t, device_t, void *);
62587ef940Skiyohara 
63587ef940Skiyohara static int nbpiic_intr(void *);
64587ef940Skiyohara int nbpiic_poll(void *, int, char *);
65587ef940Skiyohara 
66*4066ef22Sandvar /* functions for i2c_controller */
67587ef940Skiyohara static int nbpiic_exec(void *cookie, i2c_op_t, i2c_addr_t, const void *, size_t,
68587ef940Skiyohara     void *, size_t, int);
69587ef940Skiyohara 
70587ef940Skiyohara CFATTACH_DECL_NEW(pxaiic, sizeof(struct nbpiic_softc),
71587ef940Skiyohara     pxaiic_match, pxaiic_attach, NULL, NULL);
72587ef940Skiyohara 
73587ef940Skiyohara 
74587ef940Skiyohara /* ARGSUSED */
75587ef940Skiyohara static int
pxaiic_match(device_t parent,cfdata_t match,void * aux)76587ef940Skiyohara pxaiic_match(device_t parent, cfdata_t match, void *aux)
77587ef940Skiyohara {
78587ef940Skiyohara 	struct pxaip_attach_args *pxa = aux;
79587ef940Skiyohara 
80587ef940Skiyohara 	if (strcmp(pxa->pxa_name, match->cf_name) != 0 ||
81587ef940Skiyohara 	    !platid_match(&platid, &platid_mask_MACH_PSIONTEKLOGIX_NETBOOK_PRO))
82587ef940Skiyohara 		return 0;
83587ef940Skiyohara 
84587ef940Skiyohara 	pxa->pxa_size = PXA2X0_I2C_SIZE;
85587ef940Skiyohara 	return 1;
86587ef940Skiyohara }
87587ef940Skiyohara 
88587ef940Skiyohara /* ARGSUSED */
89587ef940Skiyohara static void
pxaiic_attach(device_t parent,device_t self,void * aux)90587ef940Skiyohara pxaiic_attach(device_t parent, device_t self, void *aux)
91587ef940Skiyohara {
92587ef940Skiyohara 	struct nbpiic_softc *sc = device_private(self);
93587ef940Skiyohara 	struct pxaip_attach_args *pxa = aux;
94587ef940Skiyohara 	struct i2cbus_attach_args iba;
95587ef940Skiyohara 	void *ih;
96587ef940Skiyohara 
97587ef940Skiyohara 	aprint_normal("\n");
98587ef940Skiyohara 	aprint_naive("\n");
99587ef940Skiyohara 
100587ef940Skiyohara 	sc->sc_pxa_i2c.sc_dev = self;
101587ef940Skiyohara 	sc->sc_pxa_i2c.sc_iot = pxa->pxa_iot;
102587ef940Skiyohara 	sc->sc_pxa_i2c.sc_addr = pxa->pxa_addr;
103587ef940Skiyohara 	sc->sc_pxa_i2c.sc_size = pxa->pxa_size;
104587ef940Skiyohara 	sc->sc_pxa_i2c.sc_isar = NBPIIC_SLAVE_ADDR;
105587ef940Skiyohara 	sc->sc_pxa_i2c.sc_stat = PI2C_STAT_INIT;
106587ef940Skiyohara 	if (pxa2x0_i2c_attach_sub(&sc->sc_pxa_i2c)) {
107587ef940Skiyohara 		aprint_error_dev(self, "unable to attach PXA I2C\n");
108587ef940Skiyohara 		return;
109587ef940Skiyohara 	}
110587ef940Skiyohara 
111601e1783Sthorpej 	/*
112601e1783Sthorpej 	 * Initialize mutex with IPL_HIGH.  Keyboard was connected to us.
113601e1783Sthorpej 	 * This is orthogonal to the lock held at the i2c layer; this
114601e1783Sthorpej 	 * is just to interlock us with the keyboard interrupt.
115601e1783Sthorpej 	 */
116587ef940Skiyohara 	mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_HIGH);
117587ef940Skiyohara 
118587ef940Skiyohara 	ih = pxa2x0_intr_establish(pxa->pxa_intr, IPL_HIGH, nbpiic_intr, sc);
119587ef940Skiyohara 	if (ih == NULL) {
120587ef940Skiyohara 		aprint_error_dev(self, "intr_establish failed\n");
121587ef940Skiyohara 		return;
122587ef940Skiyohara 	}
123587ef940Skiyohara 
124587ef940Skiyohara 	/* Initialize i2c_controller  */
125601e1783Sthorpej 	iic_tag_init(&sc->sc_i2c);
126587ef940Skiyohara 	sc->sc_i2c.ic_cookie = sc;
127587ef940Skiyohara 	sc->sc_i2c.ic_exec = nbpiic_exec;
128587ef940Skiyohara 
1292f02870fSchs 	memset(&iba, 0, sizeof(iba));
130587ef940Skiyohara 	iba.iba_tag = &sc->sc_i2c;
131587ef940Skiyohara 	pxa2x0_i2c_open(&sc->sc_pxa_i2c);
132c7fb772bSthorpej 	config_found(self, &iba, iicbus_print, CFARGS_NONE);
133587ef940Skiyohara 
134587ef940Skiyohara 	sc->sc_pcon = device_find_by_xname("nbppcon0");
135587ef940Skiyohara 
136587ef940Skiyohara 	/* Don't close I2C-bus.  We are slave device. */
137587ef940Skiyohara }
138587ef940Skiyohara 
139587ef940Skiyohara static int
nbpiic_intr(void * arg)140587ef940Skiyohara nbpiic_intr(void *arg)
141587ef940Skiyohara {
142587ef940Skiyohara 	struct nbpiic_softc *sc = arg;
143587ef940Skiyohara 	struct pxa2x0_i2c_softc *pi2c = &sc->sc_pxa_i2c;
144587ef940Skiyohara 	int handled, len;
145587ef940Skiyohara 
146587ef940Skiyohara 	handled = pxa2x0_i2c_intr_sub(pi2c, &len, &sc->sc_buf[sc->sc_idx]);
147587ef940Skiyohara 	if (len != 0)
148587ef940Skiyohara 		sc->sc_idx += len;
149587ef940Skiyohara 	if (pi2c->sc_stat == PI2C_STAT_STOP) {
150587ef940Skiyohara #if NNBPPCON > 0
151587ef940Skiyohara 		nbppcon_intr(sc->sc_pcon, sc->sc_idx, sc->sc_buf);
152587ef940Skiyohara #endif
153587ef940Skiyohara 		sc->sc_idx = 0;
154587ef940Skiyohara 		pi2c->sc_stat = PI2C_STAT_INIT;
155587ef940Skiyohara 	}
156587ef940Skiyohara 
157587ef940Skiyohara 	return handled;
158587ef940Skiyohara }
159587ef940Skiyohara 
160587ef940Skiyohara int
nbpiic_poll(void * cookie,int buflen,char * buf)161587ef940Skiyohara nbpiic_poll(void *cookie, int buflen, char *buf)
162587ef940Skiyohara {
163587ef940Skiyohara 	struct nbpiic_softc *sc = cookie;
164587ef940Skiyohara 	int rv;
165587ef940Skiyohara 
166587ef940Skiyohara 	if (sc->sc_idx > 0) {
167587ef940Skiyohara 		if (buflen < sc->sc_idx) {
168587ef940Skiyohara 			(void) pxa2x0_i2c_poll(&sc->sc_pxa_i2c,
169587ef940Skiyohara 			    sizeof(sc->sc_buf) - sc->sc_idx, buf + sc->sc_idx,
170587ef940Skiyohara 			    I2C_F_READ);
171587ef940Skiyohara 			sc->sc_idx = 0;
172587ef940Skiyohara 		} else
173587ef940Skiyohara 			memcpy(buf, sc->sc_buf, sc->sc_idx);
174587ef940Skiyohara 	}
175587ef940Skiyohara 	rv = pxa2x0_i2c_poll(&sc->sc_pxa_i2c,
176587ef940Skiyohara 	    buflen - sc->sc_idx, buf + sc->sc_idx, I2C_F_READ);
177587ef940Skiyohara 	sc->sc_idx = 0;
178587ef940Skiyohara 
179587ef940Skiyohara 	return rv;
180587ef940Skiyohara }
181587ef940Skiyohara 
182587ef940Skiyohara static int
nbpiic_exec(void * cookie,i2c_op_t op,i2c_addr_t addr,const void * vcmd,size_t cmdlen,void * vbuf,size_t buflen,int flags)183587ef940Skiyohara nbpiic_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd,
184587ef940Skiyohara 	    size_t cmdlen, void *vbuf, size_t buflen, int flags)
185587ef940Skiyohara {
186587ef940Skiyohara 	struct nbpiic_softc *sc = cookie;
187587ef940Skiyohara 	int rv = -1;
188587ef940Skiyohara 	const u_char cmd = *(const u_char *)vcmd;
189587ef940Skiyohara 
190601e1783Sthorpej 	mutex_enter(&sc->sc_lock);
191601e1783Sthorpej 
192587ef940Skiyohara 	if (I2C_OP_READ_P(op) && (cmdlen == 0) && (buflen == 1))
193587ef940Skiyohara 		rv = pxa2x0_i2c_read(&sc->sc_pxa_i2c, addr, (u_char *)vbuf);
194587ef940Skiyohara 
195587ef940Skiyohara 	if ((I2C_OP_READ_P(op)) && (cmdlen == 1) && (buflen == 1)) {
196587ef940Skiyohara 		rv = pxa2x0_i2c_write(&sc->sc_pxa_i2c, addr, cmd);
197587ef940Skiyohara 		if (rv == 0)
198587ef940Skiyohara 			rv = pxa2x0_i2c_read(&sc->sc_pxa_i2c,
199587ef940Skiyohara 			    addr, (u_char *)vbuf);
200587ef940Skiyohara 	}
201587ef940Skiyohara 
202587ef940Skiyohara 	if ((I2C_OP_READ_P(op)) && (cmdlen == 1) && (buflen == 2)) {
203587ef940Skiyohara printf("%s: read cmdlen=1, buflen=2: Ooops, maybe error...\n", __func__);
204587ef940Skiyohara 		rv = pxa2x0_i2c_write(&sc->sc_pxa_i2c, addr, cmd);
205587ef940Skiyohara 		if (rv == 0)
206587ef940Skiyohara 			rv = pxa2x0_i2c_read(&sc->sc_pxa_i2c,
207587ef940Skiyohara 			    addr, &((u_char *)vbuf)[0]);
208587ef940Skiyohara 		if (rv == 0)
209587ef940Skiyohara 			rv = pxa2x0_i2c_read(&sc->sc_pxa_i2c,
210587ef940Skiyohara 			    addr, &((u_char *)vbuf)[1]);
211587ef940Skiyohara 	}
212587ef940Skiyohara 
213587ef940Skiyohara 	if ((I2C_OP_WRITE_P(op)) && (cmdlen == 0) && (buflen == 1))
214587ef940Skiyohara 		rv = pxa2x0_i2c_write(&sc->sc_pxa_i2c, addr, *(u_char *)vbuf);
215587ef940Skiyohara 
216587ef940Skiyohara 	if ((I2C_OP_WRITE_P(op)) && (cmdlen == 1) && (buflen == 1)) {
217587ef940Skiyohara 		u_short v = (cmd << 8) | ((u_char *)vbuf)[0];
218587ef940Skiyohara 
219587ef940Skiyohara 		rv = pxa2x0_i2c_write_2(&sc->sc_pxa_i2c, addr, v);
220587ef940Skiyohara 	}
221587ef940Skiyohara 
222587ef940Skiyohara 	if ((I2C_OP_WRITE_P(op)) && (cmdlen == 1) && (buflen == 2)) {
223587ef940Skiyohara printf("%s: write cmdlen=1, buflen=2: Ooops, maybe error...\n", __func__);
224587ef940Skiyohara 		rv = pxa2x0_i2c_write(&sc->sc_pxa_i2c, addr, cmd);
225587ef940Skiyohara 		if (rv == 0) {
226587ef940Skiyohara 			u_short v =
227587ef940Skiyohara 			    (((u_char *)vbuf)[0] << 8) | ((u_char *)vbuf)[1];
228587ef940Skiyohara 
229587ef940Skiyohara 			rv = pxa2x0_i2c_write_2(&sc->sc_pxa_i2c, addr, v);
230587ef940Skiyohara 		}
231587ef940Skiyohara 	}
232587ef940Skiyohara 
233587ef940Skiyohara 	/* Handle quick_read/quick_write ops - XXX Untested XXX */
234587ef940Skiyohara 	if ((cmdlen == 0) && (buflen == 0))
235587ef940Skiyohara 		rv = pxa2x0_i2c_quick(&sc->sc_pxa_i2c, addr,
236587ef940Skiyohara 			I2C_OP_READ_P(op) ? 1 : 0);
237587ef940Skiyohara 
238601e1783Sthorpej 	mutex_exit(&sc->sc_lock);
239601e1783Sthorpej 
240587ef940Skiyohara 	return rv;
241587ef940Skiyohara }
242