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/* $OpenBSD: alipm.c,v 1.1 2005/12/24 23:36:36 kettenis Exp $ */
/*
* Copyright (c) 2005 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <dev/i2c/i2cvar.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
/*
* Acer Labs M7101 Power register definitions.
*/
/* PCI configuration registers. */
#define ALIPM_CONF 0xd0 /* general configuration */
#define ALIPM_CONF_SMBEN 0x0400 /* emanble SMBus */
#define ALIPM_BASE 0xe0 /* ACPI and SMBus base address */
#define ALIPM_SMB_HOSTC 0xf0 /* host configuration */
#define ALIPM_SMB_HOSTC_HSTEN 0x00000001 /* enable host controller */
#define ALIPM_SMB_HOSTC_CLOCK 0x00e00000 /* clock speed */
#define ALIPM_SMB_HOSTC_149K 0x00000000 /* 149 KHz clock */
#define ALIPM_SMB_HOSTC_74K 0x00200000 /* 74 KHz clock */
#define ALIPM_SMB_HOSTC_37K 0x00400000 /* 37 KHz clock */
#define ALIPM_SMB_HOSTC_223K 0x00800000 /* 223 KHz clock */
#define ALIPM_SMB_HOSTC_111K 0x00a00000 /* 111 KHz clock */
#define ALIPM_SMB_HOSTC_55K 0x00c00000 /* 55 KHz clock */
#define ALIPM_SMB_SIZE 32 /* SMBus I/O space size */
/* SMBus I/O registers */
#define ALIPM_SMB_HS 0x00 /* host status */
#define ALIPM_SMB_HS_IDLE 0x04
#define ALIPM_SMB_HS_BUSY 0x08 /* running a command */
#define ALIPM_SMB_HS_DONE 0x10 /* command completed */
#define ALIPM_SMB_HS_DEVERR 0x20 /* command error */
#define ALIPM_SMB_HS_BUSERR 0x40 /* transaction collision */
#define ALIPM_SMB_HS_FAILED 0x80 /* failed bus transaction */
#define ALIPM_SMB_HS_BITS \
"\020\003IDLE\004BUSY\005DONE\006DEVERR\007BUSERR\010FAILED"
#define ALIPM_SMB_HC 0x01 /* host control */
#define ALIPM_SMB_HC_KILL 0x04 /* kill command */
#define ALIPM_SMB_HC_RESET 0x08 /* reset bus */
#define ALIPM_SMB_HC_CMD_QUICK 0x00 /* QUICK command */
#define ALIPM_SMB_HC_CMD_BYTE 0x10 /* BYTE command */
#define ALIPM_SMB_HC_CMD_BDATA 0x20 /* BYTE DATA command */
#define ALIPM_SMB_HC_CMD_WDATA 0x30 /* WORD DATA command */
#define ALIPM_SMB_HC_CMD_BLOCK 0x40 /* BLOCK command */
#define ALIPM_SMB_START 0x02 /* start command */
#define ALIPM_SMB_TXSLVA 0x03 /* transmit slave address */
#define ALIPM_SMB_TXSLVA_READ (1 << 0) /* read direction */
#define ALIPM_SMB_TXSLVA_ADDR(x) (((x) & 0x7f) << 1) /* 7-bit address */
#define ALIPM_SMB_HD0 0x04 /* host data 0 */
#define ALIPM_SMB_HD1 0x05 /* host data 1 */
#define ALIPM_SMB_HBDB 0x06 /* host block data byte */
#define ALIPM_SMB_HCMD 0x07 /* host command */
#ifdef ALIPM_DEBUG
#define DPRINTF(x) printf x
#else
#define DPRINTF(x)
#endif
#define ALIPM_DELAY 100
#define ALIPM_TIMEOUT 1
struct alipm_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct i2c_controller sc_smb_tag;
struct lock sc_smb_lock;
};
int alipm_match(struct device *, void *, void *);
void alipm_attach(struct device *, struct device *, void *);
int alipm_smb_acquire_bus(void *, int);
void alipm_smb_release_bus(void *, int);
int alipm_smb_exec(void *, i2c_op_t, i2c_addr_t, const void *,
size_t, void *, size_t, int);
struct cfattach alipm_ca = {
sizeof(struct alipm_softc),
alipm_match,
alipm_attach
};
struct cfdriver alipm_cd = {
NULL, "alipm", DV_DULL
};
int
alipm_match(struct device *parent, void *match, void *aux)
{
struct pci_attach_args *pa = aux;
if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_ALI &&
(PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_ALI_M7101))
return (1);
return (0);
}
void
alipm_attach(struct device *parent, struct device *self, void *aux)
{
struct alipm_softc *sc = (struct alipm_softc *) self;
struct pci_attach_args *pa = aux;
struct i2cbus_attach_args iba;
pcireg_t iobase;
pcireg_t reg;
/* Map I/O space */
iobase = pci_conf_read(pa->pa_pc, pa->pa_tag, ALIPM_BASE) >> 16;
sc->sc_iot = pa->pa_iot;
if (bus_space_map(sc->sc_iot, iobase,
ALIPM_SMB_SIZE, 0, &sc->sc_ioh)) {
printf(": can't map I/O space\n");
return;
}
reg = pci_conf_read(pa->pa_pc, pa->pa_tag, ALIPM_CONF);
if ((reg & ALIPM_CONF_SMBEN) == 0) {
printf(": SMBus disabled\n");
return;
}
reg = pci_conf_read(pa->pa_pc, pa->pa_tag, ALIPM_SMB_HOSTC);
if ((reg & ALIPM_SMB_HOSTC_HSTEN) == 0) {
printf(": SMBus host disabled\n");
return;
}
switch (reg & ALIPM_SMB_HOSTC_CLOCK) {
case ALIPM_SMB_HOSTC_149K:
printf(": 149KHz clock");
break;
case ALIPM_SMB_HOSTC_74K:
printf(": 74KHz clock");
break;
case ALIPM_SMB_HOSTC_37K:
printf(": 37KHz clock");
break;
case ALIPM_SMB_HOSTC_223K:
printf(": 223KHz clock");
break;
case ALIPM_SMB_HOSTC_111K:
printf(": 111KHz clock");
break;
case ALIPM_SMB_HOSTC_55K:
printf(": 55KHz clock");
break;
default:
printf(" unknown clock speed");
break;
}
printf("\n");
/* Attach I2C bus */
lockinit(&sc->sc_smb_lock, PRIBIO | PCATCH, "alipm", 0, 0);
sc->sc_smb_tag.ic_cookie = sc;
sc->sc_smb_tag.ic_acquire_bus = alipm_smb_acquire_bus;
sc->sc_smb_tag.ic_release_bus = alipm_smb_release_bus;
sc->sc_smb_tag.ic_exec = alipm_smb_exec;
iba.iba_name = "iic";
iba.iba_tag = &sc->sc_smb_tag;
iba.iba_scan = 1;
config_found(&sc->sc_dev, &iba, iicbus_print);
}
int
alipm_smb_acquire_bus(void *cookie, int flags)
{
struct alipm_softc *sc = cookie;
if (flags & I2C_F_POLL)
return (0);
return (lockmgr(&sc->sc_smb_lock, LK_EXCLUSIVE, NULL));
}
void
alipm_smb_release_bus(void *cookie, int flags)
{
struct alipm_softc *sc = cookie;
if (flags & I2C_F_POLL)
return;
lockmgr(&sc->sc_smb_lock, LK_RELEASE, NULL);
}
int
alipm_smb_exec(void *cookie, i2c_op_t op, i2c_addr_t addr,
const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags)
{
struct alipm_softc *sc = cookie;
u_int8_t *b;
u_int8_t ctl, st;
int retries, error = 0;
DPRINTF(("%s: exec op %d, addr 0x%x, cmdlen %d, len %d, "
"flags 0x%x\n", sc->sc_dev.dv_xname, op, addr, cmdlen,
len, flags));
if (!I2C_OP_STOP_P(op) || cmdlen > 1 || len > 2)
return (EOPNOTSUPP);
/* Clear status bits */
bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS,
ALIPM_SMB_HS_DONE | ALIPM_SMB_HS_FAILED |
ALIPM_SMB_HS_BUSERR | ALIPM_SMB_HS_DEVERR);
/* Wait until bus is idle */
for (retries = 1000; retries > 0; retries--) {
st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS);
if (st & (ALIPM_SMB_HS_IDLE | ALIPM_SMB_HS_FAILED |
ALIPM_SMB_HS_BUSERR | ALIPM_SMB_HS_DEVERR))
break;
DELAY(ALIPM_DELAY);
}
if (retries == 0) {
printf("%s: timeout waiting until bus is idle\n",
sc->sc_dev.dv_xname);
return (ETIMEDOUT);
}
if (st & (ALIPM_SMB_HS_FAILED |
ALIPM_SMB_HS_BUSERR | ALIPM_SMB_HS_DEVERR)) {
printf("%s: bus error 0x%b\n", sc->sc_dev.dv_xname,
st, ALIPM_SMB_HS_BITS);
return (EIO);
}
/* Set slave address and transfer direction. */
bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_TXSLVA,
ALIPM_SMB_TXSLVA_ADDR(addr) |
(I2C_OP_READ_P(op) ? ALIPM_SMB_TXSLVA_READ : 0));
b = (void *)cmdbuf;
if (cmdlen > 0)
/* Set command byte */
bus_space_write_1(sc->sc_iot, sc->sc_ioh,
ALIPM_SMB_HCMD, b[0]);
if (I2C_OP_WRITE_P(op)) {
/* Write data. */
b = buf;
if (len > 0)
bus_space_write_1(sc->sc_iot, sc->sc_ioh,
ALIPM_SMB_HD0, b[0]);
if (len > 1)
bus_space_write_1(sc->sc_iot, sc->sc_ioh,
ALIPM_SMB_HD1, b[1]);
}
/* Set SMBus command */
if (len == 0)
ctl = ALIPM_SMB_HC_CMD_BYTE;
else if (len == 1)
ctl = ALIPM_SMB_HC_CMD_BDATA;
else if (len == 2)
ctl = ALIPM_SMB_HC_CMD_WDATA;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HC, ctl);
/* Start transaction */
bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_START, 0xff);
/* Poll for completion */
DELAY(ALIPM_DELAY);
for (retries = 1000; retries > 0; retries--) {
st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS);
if (st & (ALIPM_SMB_HS_IDLE | ALIPM_SMB_HS_FAILED |
ALIPM_SMB_HS_BUSERR | ALIPM_SMB_HS_DEVERR))
break;
DELAY(ALIPM_DELAY);
}
if (retries == 0) {
printf("%s: timeout\n", sc->sc_dev.dv_xname);
error = ETIMEDOUT;
goto done;
}
if ((st & ALIPM_SMB_HS_DONE) == 0) {
bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HC,
ALIPM_SMB_HC_KILL);
st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS);
}
/* Check for errors */
if (st & (ALIPM_SMB_HS_FAILED |
ALIPM_SMB_HS_BUSERR | ALIPM_SMB_HS_DEVERR)) {
error = EIO;
goto done;
}
if (I2C_OP_READ_P(op)) {
/* Read data */
b = buf;
if (len > 0)
b[0] = bus_space_read_1(sc->sc_iot, sc->sc_ioh,
ALIPM_SMB_HD0);
if (len > 1)
b[1] = bus_space_read_1(sc->sc_iot, sc->sc_ioh,
ALIPM_SMB_HD1);
}
done:
/* Clear status bits */
bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS, st);
return (error);
}
|