allow to attach a normal iic bus, implements only iic_exec() and locking functions so far.
This commit is contained in:
macallan
parent
9e54758862
commit
40f380a1cb
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@ -1,4 +1,4 @@
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/* $NetBSD: ki2c.c,v 1.2 2005/06/05 20:16:35 nathanw Exp $ */
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/* $NetBSD: ki2c.c,v 1.3 2005/08/10 14:26:46 macallan Exp $ */
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/* Id: ki2c.c,v 1.7 2002/10/05 09:56:05 tsubai Exp */
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/*-
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@ -35,61 +35,7 @@
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#include <uvm/uvm_extern.h>
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#include <machine/autoconf.h>
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/* Keywest I2C Register offsets */
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#define MODE 0
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#define CONTROL 1
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#define STATUS 2
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#define ISR 3
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#define IER 4
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#define ADDR 5
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#define SUBADDR 6
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#define DATA 7
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/* MODE */
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#define I2C_SPEED 0x03 /* Speed mask */
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#define I2C_100kHz 0x00
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#define I2C_50kHz 0x01
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#define I2C_25kHz 0x02
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#define I2C_MODE 0x0c /* Mode mask */
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#define I2C_DUMBMODE 0x00 /* Dumb mode */
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#define I2C_STDMODE 0x04 /* Standard mode */
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#define I2C_STDSUBMODE 0x08 /* Standard mode + sub address */
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#define I2C_COMBMODE 0x0c /* Combined mode */
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#define I2C_PORT 0xf0 /* Port mask */
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/* CONTROL */
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#define I2C_CT_AAK 0x01 /* Send AAK */
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#define I2C_CT_ADDR 0x02 /* Send address(es) */
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#define I2C_CT_STOP 0x04 /* Send STOP */
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#define I2C_CT_START 0x08 /* Send START */
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/* STATUS */
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#define I2C_ST_BUSY 0x01 /* Busy */
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#define I2C_ST_LASTAAK 0x02 /* Last AAK */
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#define I2C_ST_LASTRW 0x04 /* Last R/W */
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#define I2C_ST_SDA 0x08 /* SDA */
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#define I2C_ST_SCL 0x10 /* SCL */
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/* ISR/IER */
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#define I2C_INT_DATA 0x01 /* Data byte sent/received */
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#define I2C_INT_ADDR 0x02 /* Address sent */
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#define I2C_INT_STOP 0x04 /* STOP condition sent */
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#define I2C_INT_START 0x08 /* START condition sent */
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/* I2C flags */
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#define I2C_BUSY 0x01
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#define I2C_READING 0x02
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#define I2C_ERROR 0x04
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struct ki2c_softc {
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struct device sc_dev;
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u_char *sc_reg;
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int sc_regstep;
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int sc_flags;
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u_char *sc_data;
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int sc_resid;
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};
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#include <macppc/dev/ki2cvar.h>
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int ki2c_match(struct device *, struct cfdata *, void *);
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void ki2c_attach(struct device *, struct device *, void *);
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@ -103,7 +49,15 @@ int ki2c_intr(struct ki2c_softc *);
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int ki2c_poll(struct ki2c_softc *, int);
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int ki2c_start(struct ki2c_softc *, int, int, void *, int);
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int ki2c_read(struct ki2c_softc *, int, int, void *, int);
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int ki2c_write(struct ki2c_softc *, int, int, const void *, int);
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int ki2c_write(struct ki2c_softc *, int, int, void *, int);
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int ki2c_print __P((void *, const char *));
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/* I2C glue */
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static int ki2c_i2c_acquire_bus(void *, int);
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static void ki2c_i2c_release_bus(void *, int);
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static int ki2c_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t,
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void *, size_t, int);
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struct cfattach ki2c_ca = {
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"ki2c", {}, sizeof(struct ki2c_softc), ki2c_match, ki2c_attach
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@ -132,7 +86,12 @@ ki2c_attach(parent, self, aux)
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struct ki2c_softc *sc = (struct ki2c_softc *)self;
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struct confargs *ca = aux;
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int node = ca->ca_node;
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int rate;
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int rate, child, namelen;
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struct ki2c_confargs ka;
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struct i2cbus_attach_args iba;
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char name[32];
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u_int reg[20];
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ca->ca_reg[0] += ca->ca_baseaddr;
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@ -157,6 +116,56 @@ ki2c_attach(parent, self, aux)
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ki2c_setmode(sc, I2C_STDSUBMODE);
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ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */
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lockinit(&sc->sc_buslock, PRIBIO|PCATCH, sc->sc_dev.dv_xname, 0, 0);
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ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP);
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/* fill in the i2c tag */
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sc->sc_i2c.ic_cookie = sc;
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sc->sc_i2c.ic_acquire_bus = ki2c_i2c_acquire_bus;
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sc->sc_i2c.ic_release_bus = ki2c_i2c_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 = ki2c_i2c_exec;
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iba.iba_name = "iic";
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iba.iba_tag = &sc->sc_i2c;
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(void) config_found(&sc->sc_dev, &iba, iicbus_print);
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for (child = OF_child(node); child; child = OF_peer(child)) {
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namelen = OF_getprop(child, "name", name, sizeof(name));
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if (namelen < 0)
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continue;
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if (namelen >= sizeof(name))
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continue;
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name[namelen] = 0;
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ka.ka_name = name;
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ka.ka_node = child;
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if (OF_getprop(child, "reg", reg, sizeof(reg))>0) {
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ka.ka_addr = reg[0];
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ka.ka_tag = &sc->sc_i2c;
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config_found(self, &ka, ki2c_print);
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}
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}
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}
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int
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ki2c_print(aux, ki2c)
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void *aux;
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const char *ki2c;
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{
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struct ki2c_confargs *ka = aux;
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if (ki2c) {
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aprint_normal("%s at %s", ka->ka_name, ki2c);
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aprint_normal(" address 0x%x", ka->ka_addr);
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}
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return UNCONF;
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}
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u_int
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@ -231,7 +240,6 @@ ki2c_intr(sc)
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u_int isr, x;
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isr = ki2c_readreg(sc, ISR);
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if (isr & I2C_INT_ADDR) {
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#if 0
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if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) {
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@ -353,6 +361,9 @@ ki2c_read(sc, addr, subaddr, data, len)
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void *data;
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{
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sc->sc_flags = I2C_READING;
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#ifdef KI2C_DEBUG
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printf("ki2c_read: %02x %d\n", addr, len);
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#endif
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return ki2c_start(sc, addr, subaddr, data, len);
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}
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@ -360,8 +371,46 @@ int
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ki2c_write(sc, addr, subaddr, data, len)
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struct ki2c_softc *sc;
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int addr, subaddr, len;
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const void *data;
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void *data;
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{
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sc->sc_flags = 0;
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return ki2c_start(sc, addr, subaddr, __UNCONST(data), len);
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#ifdef KI2C_DEBUG
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printf("ki2c_write: %02x %d\n",addr,len);
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#endif
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return ki2c_start(sc, addr, subaddr, data, len);
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}
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static int
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ki2c_i2c_acquire_bus(void *cookie, int flags)
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{
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struct ki2c_softc *sc = cookie;
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return (lockmgr(&sc->sc_buslock, LK_EXCLUSIVE, NULL));
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}
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static void
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ki2c_i2c_release_bus(void *cookie, int flags)
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{
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struct ki2c_softc *sc = cookie;
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(void) lockmgr(&sc->sc_buslock, LK_RELEASE, NULL);
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}
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int
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ki2c_i2c_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 ki2c_softc *sc = cookie;
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/* we handle the subaddress stuff ourselves */
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ki2c_setmode(sc, I2C_STDMODE);
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if (ki2c_write(sc, addr, 0, __UNCONST(vcmd), cmdlen) !=0 )
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return -1;
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if (I2C_OP_READ_P(op))
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{
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if (ki2c_read(sc, addr, 0, vbuf, buflen) !=0 )
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return -1;
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}
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return 0;
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}
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