261 lines
7.1 KiB
C
261 lines
7.1 KiB
C
/* $NetBSD: nbpiic.c,v 1.1 2011/08/06 03:53:40 kiyohara Exp $ */
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/*
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* Copyright (c) 2011 KIYOHARA Takashi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: nbpiic.c,v 1.1 2011/08/06 03:53:40 kiyohara Exp $");
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#include <sys/param.h>
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#include <sys/device.h>
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#include <sys/mutex.h>
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#include <machine/platid.h>
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#include <machine/platid_mask.h>
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#include <arm/xscale/pxa2x0var.h>
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#include <arm/xscale/pxa2x0_i2c.h>
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#include <hpcarm/dev/nbppconvar.h>
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#include <dev/i2c/i2cvar.h>
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#include "nbppcon.h"
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#define NBPIIC_SLAVE_ADDR 0x70
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struct nbpiic_softc {
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struct pxa2x0_i2c_softc sc_pxa_i2c;
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struct i2c_controller sc_i2c;
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kmutex_t sc_lock;
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device_t sc_pcon;
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char sc_buf[16];
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int sc_idx;
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};
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static int pxaiic_match(device_t, cfdata_t, void *);
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static void pxaiic_attach(device_t, device_t, void *);
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static int nbpiic_intr(void *);
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int nbpiic_poll(void *, int, char *);
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/* fuctions for i2c_controller */
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static int nbpiic_acquire_bus(void *, int);
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static void nbpiic_release_bus(void *, int);
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static int nbpiic_exec(void *cookie, i2c_op_t, i2c_addr_t, const void *, size_t,
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void *, size_t, int);
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CFATTACH_DECL_NEW(pxaiic, sizeof(struct nbpiic_softc),
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pxaiic_match, pxaiic_attach, NULL, NULL);
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/* ARGSUSED */
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static int
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pxaiic_match(device_t parent, cfdata_t match, void *aux)
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{
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struct pxaip_attach_args *pxa = aux;
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if (strcmp(pxa->pxa_name, match->cf_name) != 0 ||
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!platid_match(&platid, &platid_mask_MACH_PSIONTEKLOGIX_NETBOOK_PRO))
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return 0;
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pxa->pxa_size = PXA2X0_I2C_SIZE;
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return 1;
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}
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/* ARGSUSED */
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static void
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pxaiic_attach(device_t parent, device_t self, void *aux)
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{
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struct nbpiic_softc *sc = device_private(self);
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struct pxaip_attach_args *pxa = aux;
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struct i2cbus_attach_args iba;
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void *ih;
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aprint_normal("\n");
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aprint_naive("\n");
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sc->sc_pxa_i2c.sc_dev = self;
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sc->sc_pxa_i2c.sc_iot = pxa->pxa_iot;
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sc->sc_pxa_i2c.sc_addr = pxa->pxa_addr;
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sc->sc_pxa_i2c.sc_size = pxa->pxa_size;
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sc->sc_pxa_i2c.sc_isar = NBPIIC_SLAVE_ADDR;
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sc->sc_pxa_i2c.sc_stat = PI2C_STAT_INIT;
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if (pxa2x0_i2c_attach_sub(&sc->sc_pxa_i2c)) {
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aprint_error_dev(self, "unable to attach PXA I2C\n");
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return;
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}
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/* Initialize mutex with IPL_HIGH. Keyboard was connected to us. */
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mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_HIGH);
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ih = pxa2x0_intr_establish(pxa->pxa_intr, IPL_HIGH, nbpiic_intr, sc);
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if (ih == NULL) {
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aprint_error_dev(self, "intr_establish failed\n");
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return;
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}
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/* Initialize i2c_controller */
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sc->sc_i2c.ic_cookie = sc;
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sc->sc_i2c.ic_acquire_bus = nbpiic_acquire_bus;
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sc->sc_i2c.ic_release_bus = nbpiic_release_bus;
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sc->sc_i2c.ic_send_start = NULL;
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sc->sc_i2c.ic_send_stop = NULL;
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sc->sc_i2c.ic_initiate_xfer = NULL;
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sc->sc_i2c.ic_read_byte = NULL;
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sc->sc_i2c.ic_write_byte = NULL;
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sc->sc_i2c.ic_exec = nbpiic_exec;
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iba.iba_tag = &sc->sc_i2c;
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pxa2x0_i2c_open(&sc->sc_pxa_i2c);
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config_found_ia(self, "i2cbus", &iba, iicbus_print);
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sc->sc_pcon = device_find_by_xname("nbppcon0");
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/* Don't close I2C-bus. We are slave device. */
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}
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static int
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nbpiic_intr(void *arg)
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{
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struct nbpiic_softc *sc = arg;
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struct pxa2x0_i2c_softc *pi2c = &sc->sc_pxa_i2c;
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int handled, len;
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handled = pxa2x0_i2c_intr_sub(pi2c, &len, &sc->sc_buf[sc->sc_idx]);
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if (len != 0)
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sc->sc_idx += len;
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if (pi2c->sc_stat == PI2C_STAT_STOP) {
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#if NNBPPCON > 0
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nbppcon_intr(sc->sc_pcon, sc->sc_idx, sc->sc_buf);
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#endif
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sc->sc_idx = 0;
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pi2c->sc_stat = PI2C_STAT_INIT;
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}
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return handled;
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}
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int
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nbpiic_poll(void *cookie, int buflen, char *buf)
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{
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struct nbpiic_softc *sc = cookie;
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int rv;
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if (sc->sc_idx > 0) {
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if (buflen < sc->sc_idx) {
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(void) pxa2x0_i2c_poll(&sc->sc_pxa_i2c,
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sizeof(sc->sc_buf) - sc->sc_idx, buf + sc->sc_idx,
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I2C_F_READ);
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sc->sc_idx = 0;
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} else
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memcpy(buf, sc->sc_buf, sc->sc_idx);
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}
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rv = pxa2x0_i2c_poll(&sc->sc_pxa_i2c,
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buflen - sc->sc_idx, buf + sc->sc_idx, I2C_F_READ);
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sc->sc_idx = 0;
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return rv;
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}
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static int
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nbpiic_acquire_bus(void *cookie, int flags)
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{
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struct nbpiic_softc *sc = cookie;
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mutex_enter(&sc->sc_lock);
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return 0;
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}
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static void
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nbpiic_release_bus(void *cookie, int flags)
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{
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struct nbpiic_softc *sc = cookie;
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mutex_exit(&sc->sc_lock);
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return;
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}
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static int
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nbpiic_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd,
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size_t cmdlen, void *vbuf, size_t buflen, int flags)
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{
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struct nbpiic_softc *sc = cookie;
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int rv = -1;
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const u_char cmd = *(const u_char *)vcmd;
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if (I2C_OP_READ_P(op) && (cmdlen == 0) && (buflen == 1))
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rv = pxa2x0_i2c_read(&sc->sc_pxa_i2c, addr, (u_char *)vbuf);
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if ((I2C_OP_READ_P(op)) && (cmdlen == 1) && (buflen == 1)) {
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rv = pxa2x0_i2c_write(&sc->sc_pxa_i2c, addr, cmd);
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if (rv == 0)
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rv = pxa2x0_i2c_read(&sc->sc_pxa_i2c,
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addr, (u_char *)vbuf);
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}
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if ((I2C_OP_READ_P(op)) && (cmdlen == 1) && (buflen == 2)) {
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printf("%s: read cmdlen=1, buflen=2: Ooops, maybe error...\n", __func__);
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rv = pxa2x0_i2c_write(&sc->sc_pxa_i2c, addr, cmd);
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if (rv == 0)
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rv = pxa2x0_i2c_read(&sc->sc_pxa_i2c,
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addr, &((u_char *)vbuf)[0]);
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if (rv == 0)
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rv = pxa2x0_i2c_read(&sc->sc_pxa_i2c,
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addr, &((u_char *)vbuf)[1]);
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}
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if ((I2C_OP_WRITE_P(op)) && (cmdlen == 0) && (buflen == 1))
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rv = pxa2x0_i2c_write(&sc->sc_pxa_i2c, addr, *(u_char *)vbuf);
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if ((I2C_OP_WRITE_P(op)) && (cmdlen == 1) && (buflen == 1)) {
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u_short v = (cmd << 8) | ((u_char *)vbuf)[0];
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rv = pxa2x0_i2c_write_2(&sc->sc_pxa_i2c, addr, v);
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}
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if ((I2C_OP_WRITE_P(op)) && (cmdlen == 1) && (buflen == 2)) {
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printf("%s: write cmdlen=1, buflen=2: Ooops, maybe error...\n", __func__);
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rv = pxa2x0_i2c_write(&sc->sc_pxa_i2c, addr, cmd);
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if (rv == 0) {
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u_short v =
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(((u_char *)vbuf)[0] << 8) | ((u_char *)vbuf)[1];
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rv = pxa2x0_i2c_write_2(&sc->sc_pxa_i2c, addr, v);
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}
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}
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/* Handle quick_read/quick_write ops - XXX Untested XXX */
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if ((cmdlen == 0) && (buflen == 0))
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rv = pxa2x0_i2c_quick(&sc->sc_pxa_i2c, addr,
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I2C_OP_READ_P(op) ? 1 : 0);
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return rv;
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}
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