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freebsd-dev/sys/dev/glxiic/glxiic.c

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/*-
* Copyright (c) 2011 Henrik Brix Andersen <brix@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* AMD Geode LX CS5536 System Management Bus controller.
*
* Although AMD refers to this device as an SMBus controller, it
* really is an I2C controller (It lacks SMBus ALERT# and Alert
* Response support).
*
* The driver is implemented as an interrupt-driven state machine,
* supporting both master and slave mode.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sysctl.h>
#ifdef GLXIIC_DEBUG
#include <sys/syslog.h>
#endif
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <dev/iicbus/iiconf.h>
#include <dev/iicbus/iicbus.h>
#include "iicbus_if.h"
/* CS5536 PCI-ISA ID. */
#define GLXIIC_CS5536_DEV_ID 0x20901022
/* MSRs. */
#define GLXIIC_MSR_PIC_YSEL_HIGH 0x51400021
/* Bus speeds. */
#define GLXIIC_SLOW 0x0258 /* 10 kHz. */
#define GLXIIC_FAST 0x0078 /* 50 kHz. */
#define GLXIIC_FASTEST 0x003c /* 100 kHz. */
/* Default bus activity timeout in milliseconds. */
#define GLXIIC_DEFAULT_TIMEOUT 35
/* GPIO register offsets. */
#define GLXIIC_GPIOL_OUT_AUX1_SEL 0x10
#define GLXIIC_GPIOL_IN_AUX1_SEL 0x34
/* GPIO 14 (SMB_CLK) and 15 (SMB_DATA) bitmasks. */
#define GLXIIC_GPIO_14_15_ENABLE 0x0000c000
#define GLXIIC_GPIO_14_15_DISABLE 0xc0000000
/* SMB register offsets. */
#define GLXIIC_SMB_SDA 0x00
#define GLXIIC_SMB_STS 0x01
#define GLXIIC_SMB_STS_SLVSTP_BIT (1 << 7)
#define GLXIIC_SMB_STS_SDAST_BIT (1 << 6)
#define GLXIIC_SMB_STS_BER_BIT (1 << 5)
#define GLXIIC_SMB_STS_NEGACK_BIT (1 << 4)
#define GLXIIC_SMB_STS_STASTR_BIT (1 << 3)
#define GLXIIC_SMB_STS_NMATCH_BIT (1 << 2)
#define GLXIIC_SMB_STS_MASTER_BIT (1 << 1)
#define GLXIIC_SMB_STS_XMIT_BIT (1 << 0)
#define GLXIIC_SMB_CTRL_STS 0x02
#define GLXIIC_SMB_CTRL_STS_TGSCL_BIT (1 << 5)
#define GLXIIC_SMB_CTRL_STS_TSDA_BIT (1 << 4)
#define GLXIIC_SMB_CTRL_STS_GCMTCH_BIT (1 << 3)
#define GLXIIC_SMB_CTRL_STS_MATCH_BIT (1 << 2)
#define GLXIIC_SMB_CTRL_STS_BB_BIT (1 << 1)
#define GLXIIC_SMB_CTRL_STS_BUSY_BIT (1 << 0)
#define GLXIIC_SMB_CTRL1 0x03
#define GLXIIC_SMB_CTRL1_STASTRE_BIT (1 << 7)
#define GLXIIC_SMB_CTRL1_NMINTE_BIT (1 << 6)
#define GLXIIC_SMB_CTRL1_GCMEN_BIT (1 << 5)
#define GLXIIC_SMB_CTRL1_ACK_BIT (1 << 4)
#define GLXIIC_SMB_CTRL1_INTEN_BIT (1 << 2)
#define GLXIIC_SMB_CTRL1_STOP_BIT (1 << 1)
#define GLXIIC_SMB_CTRL1_START_BIT (1 << 0)
#define GLXIIC_SMB_ADDR 0x04
#define GLXIIC_SMB_ADDR_SAEN_BIT (1 << 7)
#define GLXIIC_SMB_CTRL2 0x05
#define GLXIIC_SMB_CTRL2_EN_BIT (1 << 0)
#define GLXIIC_SMB_CTRL3 0x06
typedef enum {
GLXIIC_STATE_IDLE,
GLXIIC_STATE_SLAVE_TX,
GLXIIC_STATE_SLAVE_RX,
GLXIIC_STATE_MASTER_ADDR,
GLXIIC_STATE_MASTER_TX,
GLXIIC_STATE_MASTER_RX,
GLXIIC_STATE_MASTER_STOP,
GLXIIC_STATE_MAX,
} glxiic_state_t;
struct glxiic_softc {
device_t dev; /* Myself. */
device_t iicbus; /* IIC bus. */
struct mtx mtx; /* Lock. */
glxiic_state_t state; /* Driver state. */
struct callout callout; /* Driver state timeout callout. */
int timeout; /* Driver state timeout (ms). */
int smb_rid; /* SMB controller resource ID. */
struct resource *smb_res; /* SMB controller resource. */
int gpio_rid; /* GPIO resource ID. */
struct resource *gpio_res; /* GPIO resource. */
int irq_rid; /* IRQ resource ID. */
struct resource *irq_res; /* IRQ resource. */
void *irq_handler; /* IRQ handler cookie. */
int old_irq; /* IRQ mapped by board firmware. */
struct iic_msg *msg; /* Current master mode message. */
uint32_t nmsgs; /* Number of messages remaining. */
uint8_t *data; /* Current master mode data byte. */
uint16_t ndata; /* Number of data bytes remaining. */
int error; /* Last master mode error. */
uint8_t addr; /* Own address. */
uint16_t sclfrq; /* Bus frequency. */
};
#ifdef GLXIIC_DEBUG
#define GLXIIC_DEBUG_LOG(fmt, args...) \
log(LOG_DEBUG, "%s: " fmt "\n" , __func__ , ## args)
#else
#define GLXIIC_DEBUG_LOG(fmt, args...)
#endif
#define GLXIIC_SCLFRQ(n) ((n << 1))
#define GLXIIC_SMBADDR(n) ((n >> 1))
#define GLXIIC_SMB_IRQ_TO_MAP(n) ((n << 16))
#define GLXIIC_MAP_TO_SMB_IRQ(n) ((n >> 16) & 0xf)
#define GLXIIC_LOCK(_sc) mtx_lock(&_sc->mtx)
#define GLXIIC_UNLOCK(_sc) mtx_unlock(&_sc->mtx)
#define GLXIIC_LOCK_INIT(_sc) \
mtx_init(&_sc->mtx, device_get_nameunit(_sc->dev), "glxiic", MTX_DEF)
#define GLXIIC_SLEEP(_sc) \
mtx_sleep(_sc, &_sc->mtx, IICPRI, "glxiic", 0)
#define GLXIIC_WAKEUP(_sc) wakeup(_sc);
#define GLXIIC_LOCK_DESTROY(_sc) mtx_destroy(&_sc->mtx);
#define GLXIIC_ASSERT_LOCKED(_sc) mtx_assert(&_sc->mtx, MA_OWNED);
typedef int (glxiic_state_callback_t)(struct glxiic_softc *sc,
uint8_t status);
static glxiic_state_callback_t glxiic_state_idle_callback;
static glxiic_state_callback_t glxiic_state_slave_tx_callback;
static glxiic_state_callback_t glxiic_state_slave_rx_callback;
static glxiic_state_callback_t glxiic_state_master_addr_callback;
static glxiic_state_callback_t glxiic_state_master_tx_callback;
static glxiic_state_callback_t glxiic_state_master_rx_callback;
static glxiic_state_callback_t glxiic_state_master_stop_callback;
struct glxiic_state_table_entry {
glxiic_state_callback_t *callback;
boolean_t master;
};
typedef struct glxiic_state_table_entry glxiic_state_table_entry_t;
static glxiic_state_table_entry_t glxiic_state_table[GLXIIC_STATE_MAX] = {
[GLXIIC_STATE_IDLE] = {
.callback = &glxiic_state_idle_callback,
.master = FALSE,
},
[GLXIIC_STATE_SLAVE_TX] = {
.callback = &glxiic_state_slave_tx_callback,
.master = FALSE,
},
[GLXIIC_STATE_SLAVE_RX] = {
.callback = &glxiic_state_slave_rx_callback,
.master = FALSE,
},
[GLXIIC_STATE_MASTER_ADDR] = {
.callback = &glxiic_state_master_addr_callback,
.master = TRUE,
},
[GLXIIC_STATE_MASTER_TX] = {
.callback = &glxiic_state_master_tx_callback,
.master = TRUE,
},
[GLXIIC_STATE_MASTER_RX] = {
.callback = &glxiic_state_master_rx_callback,
.master = TRUE,
},
[GLXIIC_STATE_MASTER_STOP] = {
.callback = &glxiic_state_master_stop_callback,
.master = TRUE,
},
};
static void glxiic_identify(driver_t *driver, device_t parent);
static int glxiic_probe(device_t dev);
static int glxiic_attach(device_t dev);
static int glxiic_detach(device_t dev);
static uint8_t glxiic_read_status_locked(struct glxiic_softc *sc);
static void glxiic_stop_locked(struct glxiic_softc *sc);
static void glxiic_timeout(void *arg);
static void glxiic_start_timeout_locked(struct glxiic_softc *sc);
static void glxiic_set_state_locked(struct glxiic_softc *sc,
glxiic_state_t state);
static int glxiic_handle_slave_match_locked(struct glxiic_softc *sc,
uint8_t status);
static void glxiic_intr(void *arg);
static int glxiic_reset(device_t dev, u_char speed, u_char addr,
u_char *oldaddr);
static int glxiic_transfer(device_t dev, struct iic_msg *msgs,
uint32_t nmsgs);
static void glxiic_smb_map_interrupt(int irq);
static void glxiic_gpio_enable(struct glxiic_softc *sc);
static void glxiic_gpio_disable(struct glxiic_softc *sc);
static void glxiic_smb_enable(struct glxiic_softc *sc, uint8_t speed,
uint8_t addr);
static void glxiic_smb_disable(struct glxiic_softc *sc);
static device_method_t glxiic_methods[] = {
DEVMETHOD(device_identify, glxiic_identify),
DEVMETHOD(device_probe, glxiic_probe),
DEVMETHOD(device_attach, glxiic_attach),
DEVMETHOD(device_detach, glxiic_detach),
DEVMETHOD(iicbus_reset, glxiic_reset),
DEVMETHOD(iicbus_transfer, glxiic_transfer),
DEVMETHOD(iicbus_callback, iicbus_null_callback),
{ 0, 0 }
};
static driver_t glxiic_driver = {
"glxiic",
glxiic_methods,
sizeof(struct glxiic_softc),
};
static devclass_t glxiic_devclass;
DRIVER_MODULE(glxiic, isab, glxiic_driver, glxiic_devclass, 0, 0);
DRIVER_MODULE(iicbus, glxiic, iicbus_driver, iicbus_devclass, 0, 0);
MODULE_DEPEND(glxiic, iicbus, 1, 1, 1);
static void
glxiic_identify(driver_t *driver, device_t parent)
{
/* Prevent child from being added more than once. */
if (device_find_child(parent, driver->name, -1) != NULL)
return;
if (pci_get_devid(parent) == GLXIIC_CS5536_DEV_ID) {
if (device_add_child(parent, driver->name, -1) == NULL)
device_printf(parent, "Could not add glxiic child\n");
}
}
static int
glxiic_probe(device_t dev)
{
if (resource_disabled("glxiic", device_get_unit(dev)))
return (ENXIO);
device_set_desc(dev, "AMD Geode CS5536 SMBus controller");
return (BUS_PROBE_DEFAULT);
}
static int
glxiic_attach(device_t dev)
{
struct glxiic_softc *sc;
struct sysctl_ctx_list *ctx;
struct sysctl_oid *tree;
int error, irq, unit;
uint32_t irq_map;
sc = device_get_softc(dev);
sc->dev = dev;
sc->state = GLXIIC_STATE_IDLE;
error = 0;
GLXIIC_LOCK_INIT(sc);
callout_init_mtx(&sc->callout, &sc->mtx, 0);
sc->smb_rid = PCIR_BAR(0);
sc->smb_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &sc->smb_rid,
RF_ACTIVE);
if (sc->smb_res == NULL) {
device_printf(dev, "Could not allocate SMBus I/O port\n");
error = ENXIO;
goto out;
}
sc->gpio_rid = PCIR_BAR(1);
sc->gpio_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
&sc->gpio_rid, RF_SHAREABLE | RF_ACTIVE);
if (sc->gpio_res == NULL) {
device_printf(dev, "Could not allocate GPIO I/O port\n");
error = ENXIO;
goto out;
}
/* Ensure the controller is not enabled by firmware. */
glxiic_smb_disable(sc);
/* Read the existing IRQ map. */
irq_map = rdmsr(GLXIIC_MSR_PIC_YSEL_HIGH);
sc->old_irq = GLXIIC_MAP_TO_SMB_IRQ(irq_map);
unit = device_get_unit(dev);
if (resource_int_value("glxiic", unit, "irq", &irq) == 0) {
if (irq < 1 || irq > 15) {
device_printf(dev, "Bad value %d for glxiic.%d.irq\n",
irq, unit);
error = ENXIO;
goto out;
}
if (bootverbose)
device_printf(dev, "Using irq %d set by hint\n", irq);
} else if (sc->old_irq != 0) {
if (bootverbose)
device_printf(dev, "Using irq %d set by firmware\n",
irq);
irq = sc->old_irq;
} else {
device_printf(dev, "No irq mapped by firmware");
printf(" and no glxiic.%d.irq hint provided\n", unit);
error = ENXIO;
goto out;
}
/* Map the SMBus interrupt to the requested legacy IRQ. */
glxiic_smb_map_interrupt(irq);
sc->irq_rid = 0;
sc->irq_res = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->irq_rid,
irq, irq, 1, RF_SHAREABLE | RF_ACTIVE);
if (sc->irq_res == NULL) {
device_printf(dev, "Could not allocate IRQ %d\n", irq);
error = ENXIO;
goto out;
}
error = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
NULL, glxiic_intr, sc, &(sc->irq_handler));
if (error != 0) {
device_printf(dev, "Could not setup IRQ handler\n");
error = ENXIO;
goto out;
}
if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL) {
device_printf(dev, "Could not allocate iicbus instance\n");
error = ENXIO;
goto out;
}
ctx = device_get_sysctl_ctx(dev);
tree = device_get_sysctl_tree(dev);
sc->timeout = GLXIIC_DEFAULT_TIMEOUT;
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
"timeout", CTLFLAG_RWTUN, &sc->timeout, 0,
"activity timeout in ms");
glxiic_gpio_enable(sc);
glxiic_smb_enable(sc, IIC_FASTEST, 0);
error = bus_generic_attach(dev);
if (error != 0) {
device_printf(dev, "Could not probe and attach children\n");
error = ENXIO;
}
out:
if (error != 0) {
callout_drain(&sc->callout);
if (sc->iicbus != NULL)
device_delete_child(dev, sc->iicbus);
if (sc->smb_res != NULL) {
glxiic_smb_disable(sc);
bus_release_resource(dev, SYS_RES_IOPORT, sc->smb_rid,
sc->smb_res);
}
if (sc->gpio_res != NULL) {
glxiic_gpio_disable(sc);
bus_release_resource(dev, SYS_RES_IOPORT, sc->gpio_rid,
sc->gpio_res);
}
if (sc->irq_handler != NULL)
bus_teardown_intr(dev, sc->irq_res, sc->irq_handler);
if (sc->irq_res != NULL)
bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid,
sc->irq_res);
/* Restore the old SMBus interrupt mapping. */
glxiic_smb_map_interrupt(sc->old_irq);
GLXIIC_LOCK_DESTROY(sc);
}
return (error);
}
static int
glxiic_detach(device_t dev)
{
struct glxiic_softc *sc;
int error;
sc = device_get_softc(dev);
error = bus_generic_detach(dev);
if (error != 0)
goto out;
if (sc->iicbus != NULL)
error = device_delete_child(dev, sc->iicbus);
out:
callout_drain(&sc->callout);
if (sc->smb_res != NULL) {
glxiic_smb_disable(sc);
bus_release_resource(dev, SYS_RES_IOPORT, sc->smb_rid,
sc->smb_res);
}
if (sc->gpio_res != NULL) {
glxiic_gpio_disable(sc);
bus_release_resource(dev, SYS_RES_IOPORT, sc->gpio_rid,
sc->gpio_res);
}
if (sc->irq_handler != NULL)
bus_teardown_intr(dev, sc->irq_res, sc->irq_handler);
if (sc->irq_res != NULL)
bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid,
sc->irq_res);
/* Restore the old SMBus interrupt mapping. */
glxiic_smb_map_interrupt(sc->old_irq);
GLXIIC_LOCK_DESTROY(sc);
return (error);
}
static uint8_t
glxiic_read_status_locked(struct glxiic_softc *sc)
{
uint8_t status;
GLXIIC_ASSERT_LOCKED(sc);
status = bus_read_1(sc->smb_res, GLXIIC_SMB_STS);
/* Clear all status flags except SDAST and STASTR after reading. */
bus_write_1(sc->smb_res, GLXIIC_SMB_STS, (GLXIIC_SMB_STS_SLVSTP_BIT |
GLXIIC_SMB_STS_BER_BIT | GLXIIC_SMB_STS_NEGACK_BIT |
GLXIIC_SMB_STS_NMATCH_BIT));
return (status);
}
static void
glxiic_stop_locked(struct glxiic_softc *sc)
{
uint8_t status, ctrl1;
GLXIIC_ASSERT_LOCKED(sc);
status = glxiic_read_status_locked(sc);
ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);
bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,
ctrl1 | GLXIIC_SMB_CTRL1_STOP_BIT);
/*
* Perform a dummy read of SDA in master receive mode to clear
* SDAST if set.
*/
if ((status & GLXIIC_SMB_STS_XMIT_BIT) == 0 &&
(status & GLXIIC_SMB_STS_SDAST_BIT) != 0)
bus_read_1(sc->smb_res, GLXIIC_SMB_SDA);
/* Check stall after start bit and clear if needed */
if ((status & GLXIIC_SMB_STS_STASTR_BIT) != 0) {
bus_write_1(sc->smb_res, GLXIIC_SMB_STS,
GLXIIC_SMB_STS_STASTR_BIT);
}
}
static void
glxiic_timeout(void *arg)
{
struct glxiic_softc *sc;
uint8_t error;
sc = (struct glxiic_softc *)arg;
GLXIIC_DEBUG_LOG("timeout in state %d", sc->state);
if (glxiic_state_table[sc->state].master) {
sc->error = IIC_ETIMEOUT;
GLXIIC_WAKEUP(sc);
} else {
error = IIC_ETIMEOUT;
iicbus_intr(sc->iicbus, INTR_ERROR, &error);
}
glxiic_smb_disable(sc);
glxiic_smb_enable(sc, IIC_UNKNOWN, sc->addr);
glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE);
}
static void
glxiic_start_timeout_locked(struct glxiic_softc *sc)
{
GLXIIC_ASSERT_LOCKED(sc);
callout_reset(&sc->callout, sc->timeout * 1000 / hz, glxiic_timeout,
sc);
}
static void
glxiic_set_state_locked(struct glxiic_softc *sc, glxiic_state_t state)
{
GLXIIC_ASSERT_LOCKED(sc);
if (state == GLXIIC_STATE_IDLE)
callout_stop(&sc->callout);
else if (sc->timeout > 0)
glxiic_start_timeout_locked(sc);
sc->state = state;
}
static int
glxiic_handle_slave_match_locked(struct glxiic_softc *sc, uint8_t status)
{
uint8_t ctrl_sts, addr;
GLXIIC_ASSERT_LOCKED(sc);
ctrl_sts = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL_STS);
if ((ctrl_sts & GLXIIC_SMB_CTRL_STS_MATCH_BIT) != 0) {
if ((status & GLXIIC_SMB_STS_XMIT_BIT) != 0) {
addr = sc->addr | LSB;
glxiic_set_state_locked(sc,
GLXIIC_STATE_SLAVE_TX);
} else {
addr = sc->addr & ~LSB;
glxiic_set_state_locked(sc,
GLXIIC_STATE_SLAVE_RX);
}
iicbus_intr(sc->iicbus, INTR_START, &addr);
} else if ((ctrl_sts & GLXIIC_SMB_CTRL_STS_GCMTCH_BIT) != 0) {
addr = 0;
glxiic_set_state_locked(sc, GLXIIC_STATE_SLAVE_RX);
iicbus_intr(sc->iicbus, INTR_GENERAL, &addr);
} else {
GLXIIC_DEBUG_LOG("unknown slave match");
return (IIC_ESTATUS);
}
return (IIC_NOERR);
}
static int
glxiic_state_idle_callback(struct glxiic_softc *sc, uint8_t status)
{
GLXIIC_ASSERT_LOCKED(sc);
if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) {
GLXIIC_DEBUG_LOG("bus error in idle");
return (IIC_EBUSERR);
}
if ((status & GLXIIC_SMB_STS_NMATCH_BIT) != 0) {
return (glxiic_handle_slave_match_locked(sc, status));
}
return (IIC_NOERR);
}
static int
glxiic_state_slave_tx_callback(struct glxiic_softc *sc, uint8_t status)
{
uint8_t data;
GLXIIC_ASSERT_LOCKED(sc);
if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) {
GLXIIC_DEBUG_LOG("bus error in slave tx");
return (IIC_EBUSERR);
}
if ((status & GLXIIC_SMB_STS_SLVSTP_BIT) != 0) {
iicbus_intr(sc->iicbus, INTR_STOP, NULL);
glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE);
return (IIC_NOERR);
}
if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) {
iicbus_intr(sc->iicbus, INTR_NOACK, NULL);
return (IIC_NOERR);
}
if ((status & GLXIIC_SMB_STS_NMATCH_BIT) != 0) {
/* Handle repeated start in slave mode. */
return (glxiic_handle_slave_match_locked(sc, status));
}
if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) {
GLXIIC_DEBUG_LOG("not awaiting data in slave tx");
return (IIC_ESTATUS);
}
iicbus_intr(sc->iicbus, INTR_TRANSMIT, &data);
bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, data);
glxiic_start_timeout_locked(sc);
return (IIC_NOERR);
}
static int
glxiic_state_slave_rx_callback(struct glxiic_softc *sc, uint8_t status)
{
uint8_t data;
GLXIIC_ASSERT_LOCKED(sc);
if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) {
GLXIIC_DEBUG_LOG("bus error in slave rx");
return (IIC_EBUSERR);
}
if ((status & GLXIIC_SMB_STS_SLVSTP_BIT) != 0) {
iicbus_intr(sc->iicbus, INTR_STOP, NULL);
glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE);
return (IIC_NOERR);
}
if ((status & GLXIIC_SMB_STS_NMATCH_BIT) != 0) {
/* Handle repeated start in slave mode. */
return (glxiic_handle_slave_match_locked(sc, status));
}
if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) {
GLXIIC_DEBUG_LOG("no pending data in slave rx");
return (IIC_ESTATUS);
}
data = bus_read_1(sc->smb_res, GLXIIC_SMB_SDA);
iicbus_intr(sc->iicbus, INTR_RECEIVE, &data);
glxiic_start_timeout_locked(sc);
return (IIC_NOERR);
}
static int
glxiic_state_master_addr_callback(struct glxiic_softc *sc, uint8_t status)
{
uint8_t slave;
uint8_t ctrl1;
GLXIIC_ASSERT_LOCKED(sc);
if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) {
GLXIIC_DEBUG_LOG("bus error after master start");
return (IIC_EBUSERR);
}
if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) {
GLXIIC_DEBUG_LOG("not bus master after master start");
return (IIC_ESTATUS);
}
if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) {
GLXIIC_DEBUG_LOG("not awaiting address in master addr");
return (IIC_ESTATUS);
}
if ((sc->msg->flags & IIC_M_RD) != 0) {
slave = sc->msg->slave | LSB;
glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_RX);
} else {
slave = sc->msg->slave & ~LSB;
glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_TX);
}
sc->data = sc->msg->buf;
sc->ndata = sc->msg->len;
/* Handle address-only transfer. */
if (sc->ndata == 0)
glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_STOP);
bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, slave);
if ((sc->msg->flags & IIC_M_RD) != 0 && sc->ndata == 1) {
/* Last byte from slave, set NACK. */
ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);
bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,
ctrl1 | GLXIIC_SMB_CTRL1_ACK_BIT);
}
return (IIC_NOERR);
}
static int
glxiic_state_master_tx_callback(struct glxiic_softc *sc, uint8_t status)
{
GLXIIC_ASSERT_LOCKED(sc);
if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) {
GLXIIC_DEBUG_LOG("bus error in master tx");
return (IIC_EBUSERR);
}
if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) {
GLXIIC_DEBUG_LOG("not bus master in master tx");
return (IIC_ESTATUS);
}
if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) {
GLXIIC_DEBUG_LOG("slave nack in master tx");
return (IIC_ENOACK);
}
if ((status & GLXIIC_SMB_STS_STASTR_BIT) != 0) {
bus_write_1(sc->smb_res, GLXIIC_SMB_STS,
GLXIIC_SMB_STS_STASTR_BIT);
}
if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) {
GLXIIC_DEBUG_LOG("not awaiting data in master tx");
return (IIC_ESTATUS);
}
bus_write_1(sc->smb_res, GLXIIC_SMB_SDA, *sc->data++);
if (--sc->ndata == 0)
glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_STOP);
else
glxiic_start_timeout_locked(sc);
return (IIC_NOERR);
}
static int
glxiic_state_master_rx_callback(struct glxiic_softc *sc, uint8_t status)
{
uint8_t ctrl1;
GLXIIC_ASSERT_LOCKED(sc);
if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) {
GLXIIC_DEBUG_LOG("bus error in master rx");
return (IIC_EBUSERR);
}
if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) {
GLXIIC_DEBUG_LOG("not bus master in master rx");
return (IIC_ESTATUS);
}
if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) {
GLXIIC_DEBUG_LOG("slave nack in rx");
return (IIC_ENOACK);
}
if ((status & GLXIIC_SMB_STS_STASTR_BIT) != 0) {
/* Bus is stalled, clear and wait for data. */
bus_write_1(sc->smb_res, GLXIIC_SMB_STS,
GLXIIC_SMB_STS_STASTR_BIT);
return (IIC_NOERR);
}
if ((status & GLXIIC_SMB_STS_SDAST_BIT) == 0) {
GLXIIC_DEBUG_LOG("no pending data in master rx");
return (IIC_ESTATUS);
}
*sc->data++ = bus_read_1(sc->smb_res, GLXIIC_SMB_SDA);
if (--sc->ndata == 0) {
/* Proceed with stop on reading last byte. */
glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_STOP);
return (glxiic_state_table[sc->state].callback(sc, status));
}
if (sc->ndata == 1) {
/* Last byte from slave, set NACK. */
ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);
bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,
ctrl1 | GLXIIC_SMB_CTRL1_ACK_BIT);
}
glxiic_start_timeout_locked(sc);
return (IIC_NOERR);
}
static int
glxiic_state_master_stop_callback(struct glxiic_softc *sc, uint8_t status)
{
uint8_t ctrl1;
GLXIIC_ASSERT_LOCKED(sc);
if ((status & GLXIIC_SMB_STS_BER_BIT) != 0) {
GLXIIC_DEBUG_LOG("bus error in master stop");
return (IIC_EBUSERR);
}
if ((status & GLXIIC_SMB_STS_MASTER_BIT) == 0) {
GLXIIC_DEBUG_LOG("not bus master in master stop");
return (IIC_ESTATUS);
}
if ((status & GLXIIC_SMB_STS_NEGACK_BIT) != 0) {
GLXIIC_DEBUG_LOG("slave nack in master stop");
return (IIC_ENOACK);
}
if (--sc->nmsgs > 0) {
/* Start transfer of next message. */
if ((sc->msg->flags & IIC_M_NOSTOP) == 0) {
glxiic_stop_locked(sc);
}
ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);
bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,
ctrl1 | GLXIIC_SMB_CTRL1_START_BIT);
glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_ADDR);
sc->msg++;
} else {
/* Last message. */
glxiic_stop_locked(sc);
glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE);
sc->error = IIC_NOERR;
GLXIIC_WAKEUP(sc);
}
return (IIC_NOERR);
}
static void
glxiic_intr(void *arg)
{
struct glxiic_softc *sc;
int error;
uint8_t status, data;
sc = (struct glxiic_softc *)arg;
GLXIIC_LOCK(sc);
status = glxiic_read_status_locked(sc);
/* Check if this interrupt originated from the SMBus. */
if ((status &
~(GLXIIC_SMB_STS_MASTER_BIT | GLXIIC_SMB_STS_XMIT_BIT)) != 0) {
error = glxiic_state_table[sc->state].callback(sc, status);
if (error != IIC_NOERR) {
if (glxiic_state_table[sc->state].master) {
glxiic_stop_locked(sc);
glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE);
sc->error = error;
GLXIIC_WAKEUP(sc);
} else {
data = error & 0xff;
iicbus_intr(sc->iicbus, INTR_ERROR, &data);
glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE);
}
}
}
GLXIIC_UNLOCK(sc);
}
static int
glxiic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
{
struct glxiic_softc *sc;
sc = device_get_softc(dev);
GLXIIC_LOCK(sc);
if (oldaddr != NULL)
*oldaddr = sc->addr;
sc->addr = addr;
/* A disable/enable cycle resets the controller. */
glxiic_smb_disable(sc);
glxiic_smb_enable(sc, speed, addr);
if (glxiic_state_table[sc->state].master) {
sc->error = IIC_ESTATUS;
GLXIIC_WAKEUP(sc);
}
glxiic_set_state_locked(sc, GLXIIC_STATE_IDLE);
GLXIIC_UNLOCK(sc);
return (IIC_NOERR);
}
static int
glxiic_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
{
struct glxiic_softc *sc;
int error;
uint8_t ctrl1;
sc = device_get_softc(dev);
GLXIIC_LOCK(sc);
if (sc->state != GLXIIC_STATE_IDLE) {
error = IIC_EBUSBSY;
goto out;
}
sc->msg = msgs;
sc->nmsgs = nmsgs;
glxiic_set_state_locked(sc, GLXIIC_STATE_MASTER_ADDR);
/* Set start bit and let glxiic_intr() handle the transfer. */
ctrl1 = bus_read_1(sc->smb_res, GLXIIC_SMB_CTRL1);
bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,
ctrl1 | GLXIIC_SMB_CTRL1_START_BIT);
GLXIIC_SLEEP(sc);
error = sc->error;
out:
GLXIIC_UNLOCK(sc);
return (error);
}
static void
glxiic_smb_map_interrupt(int irq)
{
uint32_t irq_map;
int old_irq;
/* Protect the read-modify-write operation. */
critical_enter();
irq_map = rdmsr(GLXIIC_MSR_PIC_YSEL_HIGH);
old_irq = GLXIIC_MAP_TO_SMB_IRQ(irq_map);
if (irq != old_irq) {
irq_map &= ~GLXIIC_SMB_IRQ_TO_MAP(old_irq);
irq_map |= GLXIIC_SMB_IRQ_TO_MAP(irq);
wrmsr(GLXIIC_MSR_PIC_YSEL_HIGH, irq_map);
}
critical_exit();
}
static void
glxiic_gpio_enable(struct glxiic_softc *sc)
{
bus_write_4(sc->gpio_res, GLXIIC_GPIOL_IN_AUX1_SEL,
GLXIIC_GPIO_14_15_ENABLE);
bus_write_4(sc->gpio_res, GLXIIC_GPIOL_OUT_AUX1_SEL,
GLXIIC_GPIO_14_15_ENABLE);
}
static void
glxiic_gpio_disable(struct glxiic_softc *sc)
{
bus_write_4(sc->gpio_res, GLXIIC_GPIOL_OUT_AUX1_SEL,
GLXIIC_GPIO_14_15_DISABLE);
bus_write_4(sc->gpio_res, GLXIIC_GPIOL_IN_AUX1_SEL,
GLXIIC_GPIO_14_15_DISABLE);
}
static void
glxiic_smb_enable(struct glxiic_softc *sc, uint8_t speed, uint8_t addr)
{
uint8_t ctrl1;
ctrl1 = 0;
switch (speed) {
case IIC_SLOW:
sc->sclfrq = GLXIIC_SLOW;
break;
case IIC_FAST:
sc->sclfrq = GLXIIC_FAST;
break;
case IIC_FASTEST:
sc->sclfrq = GLXIIC_FASTEST;
break;
case IIC_UNKNOWN:
default:
/* Reuse last frequency. */
break;
}
/* Set bus speed and enable controller. */
bus_write_2(sc->smb_res, GLXIIC_SMB_CTRL2,
GLXIIC_SCLFRQ(sc->sclfrq) | GLXIIC_SMB_CTRL2_EN_BIT);
if (addr != 0) {
/* Enable new match and global call match interrupts. */
ctrl1 |= GLXIIC_SMB_CTRL1_NMINTE_BIT |
GLXIIC_SMB_CTRL1_GCMEN_BIT;
bus_write_1(sc->smb_res, GLXIIC_SMB_ADDR,
GLXIIC_SMB_ADDR_SAEN_BIT | GLXIIC_SMBADDR(addr));
} else {
bus_write_1(sc->smb_res, GLXIIC_SMB_ADDR, 0);
}
/* Enable stall after start and interrupt. */
bus_write_1(sc->smb_res, GLXIIC_SMB_CTRL1,
ctrl1 | GLXIIC_SMB_CTRL1_STASTRE_BIT | GLXIIC_SMB_CTRL1_INTEN_BIT);
}
static void
glxiic_smb_disable(struct glxiic_softc *sc)
{
uint16_t sclfrq;
sclfrq = bus_read_2(sc->smb_res, GLXIIC_SMB_CTRL2);
bus_write_2(sc->smb_res, GLXIIC_SMB_CTRL2,
sclfrq & ~GLXIIC_SMB_CTRL2_EN_BIT);
}
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