Differential D24361 Diff 71654 sys/arm/freescale/vybrid/vf_i2c.c

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sys/arm/freescale/vybrid/vf_i2c.c

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#include <dev/iicbus/iicbus.h>		#include <dev/iicbus/iicbus.h>

#include "iicbus_if.h"		#include "iicbus_if.h"

#include <dev/ofw/openfirm.h>		#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>		#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>		#include <dev/ofw/ofw_bus_subr.h>

		#ifdef EXT_RESOURCES
		#include <dev/extres/clk/clk.h>
		#endif

#include <machine/bus.h>		#include <machine/bus.h>
#include <machine/cpu.h>		#include <machine/cpu.h>
#include <machine/intr.h>		#include <machine/intr.h>

#include <arm/freescale/vybrid/vf_common.h>		#include <arm/freescale/vybrid/vf_common.h>

#define I2C_IBAD 0x0 /* I2C Bus Address Register */		#define I2C_IBAD 0x0 /* I2C Bus Address Register */
#define I2C_IBFD 0x1 /* I2C Bus Frequency Divider Register */		#define I2C_IBFD 0x1 /* I2C Bus Frequency Divider Register */
Show All 20 Lines

#ifdef DEBUG		#ifdef DEBUG
#define vf_i2c_dbg(_sc, fmt, args...) \		#define vf_i2c_dbg(_sc, fmt, args...) \
device_printf((_sc)->dev, fmt, ##args)		device_printf((_sc)->dev, fmt, ##args)
#else		#else
#define vf_i2c_dbg(_sc, fmt, args...)		#define vf_i2c_dbg(_sc, fmt, args...)
#endif		#endif

		#define HW_UNKNOWN 0x00
		#define HW_MVF600 0x01
		#define HW_VF610 0x02

static int i2c_repeated_start(device_t, u_char, int);		static int i2c_repeated_start(device_t, u_char, int);
static int i2c_start(device_t, u_char, int);		static int i2c_start(device_t, u_char, int);
static int i2c_stop(device_t);		static int i2c_stop(device_t);
static int i2c_reset(device_t, u_char, u_char, u_char *);		static int i2c_reset(device_t, u_char, u_char, u_char *);
static int i2c_read(device_t, char , int, int , int, int);		static int i2c_read(device_t, char , int, int , int, int);
static int i2c_write(device_t, const char , int, int , int);		static int i2c_write(device_t, const char , int, int , int);
		static phandle_t i2c_get_node(device_t, device_t);

		struct i2c_div_type {
		uint32_t reg_val;
		uint32_t div;
		};

struct i2c_softc {		struct i2c_softc {
struct resource *res[2];		struct resource *res[2];
bus_space_tag_t bst;		bus_space_tag_t bst;
bus_space_handle_t bsh;		bus_space_handle_t bsh;
		#ifdef EXT_RESOURCES
		clk_t clock;
		uint32_t freq;
		#endif
device_t dev;		device_t dev;
device_t iicbus;		device_t iicbus;
struct mtx mutex;		struct mtx mutex;
		uintptr_t hwtype;
};		};

static struct resource_spec i2c_spec[] = {		static struct resource_spec i2c_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },		{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ SYS_RES_IRQ, 0, RF_ACTIVE },		{ SYS_RES_IRQ, 0, RF_ACTIVE },
{ -1, 0 }		{ -1, 0 }
};		};

		#ifdef EXT_RESOURCES
		static struct i2c_div_type vf610_div_table[] = {
		{ 0x00, 20 }, { 0x01, 22 }, { 0x02, 24 }, { 0x03, 26 },
		{ 0x04, 28 }, { 0x05, 30 }, { 0x09, 32 }, { 0x06, 34 },
		{ 0x0A, 36 }, { 0x0B, 40 }, { 0x0C, 44 }, { 0x0D, 48 },
		{ 0x0E, 56 }, { 0x12, 64 }, { 0x13, 72 }, { 0x14, 80 },
		{ 0x15, 88 }, { 0x19, 96 }, { 0x16, 104 }, { 0x1A, 112 },
		{ 0x17, 128 }, { 0x1D, 160 }, { 0x1E, 192 }, { 0x22, 224 },
		{ 0x1F, 240 }, { 0x23, 256 }, { 0x24, 288 }, { 0x25, 320 },
		{ 0x26, 384 }, { 0x2A, 448 }, { 0x27, 480 }, { 0x2B, 512 },
		{ 0x2C, 576 }, { 0x2D, 640 }, { 0x2E, 768 }, { 0x32, 896 },
		{ 0x2F, 960 }, { 0x33, 1024 }, { 0x34, 1152 }, { 0x35, 1280 },
		{ 0x36, 1536 }, { 0x3A, 1792 }, { 0x37, 1920 }, { 0x3B, 2048 },
		{ 0x3C, 2304 }, { 0x3D, 2560 }, { 0x3E, 3072 }, { 0x3F, 3840 }
		};
		#endif

		static const struct ofw_compat_data i2c_compat_data[] = {
		{"fsl,mvf600-i2c", HW_MVF600},
		{"fsl,vf610-i2c", HW_VF610},
		{NULL, HW_UNKNOWN}
		};

static int		static int
i2c_probe(device_t dev)		i2c_probe(device_t dev)
{		{

if (!ofw_bus_status_okay(dev))		if (!ofw_bus_status_okay(dev))
return (ENXIO);		return (ENXIO);

if (!ofw_bus_is_compatible(dev, "fsl,mvf600-i2c"))		if (!ofw_bus_search_compatible(dev, i2c_compat_data)->ocd_data)
return (ENXIO);		return (ENXIO);

device_set_desc(dev, "Vybrid Family Inter-Integrated Circuit (I2C)");		device_set_desc(dev, "Vybrid Family Inter-Integrated Circuit (I2C)");
return (BUS_PROBE_DEFAULT);		return (BUS_PROBE_DEFAULT);
}		}

static int		static int
i2c_attach(device_t dev)		i2c_attach(device_t dev)
{		{
struct i2c_softc *sc;		struct i2c_softc *sc;
		#ifdef EXT_RESOURCES
		phandle_t node;
		#endif
		int error;

sc = device_get_softc(dev);		sc = device_get_softc(dev);
sc->dev = dev;		sc->dev = dev;
		sc->hwtype = ofw_bus_search_compatible(dev, i2c_compat_data)->ocd_data;
		#ifdef EXT_RESOURCES
		node = ofw_bus_get_node(dev);

		error = clk_get_by_ofw_index(dev, node, 0, &sc->clock);
		if (error != 0) {
		sc->freq = 0;
		device_printf(dev, "Parent clock not found.\n");
		manuUnsubmitted Not Done Inline Actions Can the driver work if there is no clock ? Since you set sc->freq below I'm not sure it can. manu: Can the driver work if there is no clock ? Since you set sc->freq below I'm not sure it can.
		dgr_semihalf.comAuthorUnsubmitted Not Done Inline Actions The driver can work without clock - when no clock is found it uses the highest possible prescaler value for VF610. For MVF600 the way driver originally worked is preserved. dgr_semihalf.com: The driver can work without clock - when no clock is found it uses the highest possible…
		} else {
		if (OF_hasprop(node, "clock-frequency"))
		OF_getencprop(node, "clock-frequency", &sc->freq,
		sizeof(sc->freq));
		else
		sc->freq = 100000;
		}
		#endif

mtx_init(&sc->mutex, device_get_nameunit(dev), "I2C", MTX_DEF);		mtx_init(&sc->mutex, device_get_nameunit(dev), "I2C", MTX_DEF);

if (bus_alloc_resources(dev, i2c_spec, sc->res)) {		error = bus_alloc_resources(dev, i2c_spec, sc->res);
		if (error != 0) {
		mtx_destroy(&sc->mutex);
device_printf(dev, "could not allocate resources\n");		device_printf(dev, "could not allocate resources\n");
return (ENXIO);		return (ENXIO);
}		}

/* Memory interface */		/* Memory interface */
sc->bst = rman_get_bustag(sc->res[0]);		sc->bst = rman_get_bustag(sc->res[0]);
sc->bsh = rman_get_bushandle(sc->res[0]);		sc->bsh = rman_get_bushandle(sc->res[0]);

WRITE1(sc, I2C_IBIC, IBIC_BIIE);		WRITE1(sc, I2C_IBIC, IBIC_BIIE);

sc->iicbus = device_add_child(dev, "iicbus", -1);		sc->iicbus = device_add_child(dev, "iicbus", -1);
if (sc->iicbus == NULL) {		if (sc->iicbus == NULL) {
device_printf(dev, "could not add iicbus child");		device_printf(dev, "could not add iicbus child");
mtx_destroy(&sc->mutex);		mtx_destroy(&sc->mutex);
		bus_release_resources(dev, i2c_spec, sc->res);
return (ENXIO);		return (ENXIO);
}		}

bus_generic_attach(dev);		bus_generic_attach(dev);

return (0);		return (0);
}		}

		static int
		i2c_detach(device_t dev)
		{
		struct i2c_softc *sc;
		int error = 0;

		sc = device_get_softc(dev);

		error = bus_generic_detach(dev);
		if (error != 0) {
		device_printf(dev, "cannot detach child devices.\n");
		return (error);
		}

		error = device_delete_child(dev, sc->iicbus);
		if (error != 0) {
		device_printf(dev, "could not delete iicbus child.\n");
		return (error);
		}

		bus_release_resources(dev, i2c_spec, sc->res);
		manuUnsubmitted Not Done Inline Actions Missing call to bus_release_resources manu: Missing call to bus_release_resources

		mtx_destroy(&sc->mutex);

		return (0);
		}

/* Wait for transfer interrupt flag */		/* Wait for transfer interrupt flag */
static int		static int
wait_for_iif(struct i2c_softc *sc)		wait_for_iif(struct i2c_softc *sc)
{		{
int retry;		int retry;

retry = 1000;		retry = 1000;
while (retry --) {		while (retry --) {
▲ Show 20 Lines • Show All 74 Lines • ▼ Show 20 Lines	i2c_repeated_start(device_t dev, u_char slave, int timeout)

/* Write target address - LSB is R/W bit */		/* Write target address - LSB is R/W bit */
WRITE1(sc, I2C_IBDR, slave);		WRITE1(sc, I2C_IBDR, slave);

error = wait_for_iif(sc);		error = wait_for_iif(sc);

mtx_unlock(&sc->mutex);		mtx_unlock(&sc->mutex);

if (error)		if (error != 0)
return (error);		return (error);

return (IIC_NOERR);		return (IIC_NOERR);
}		}

static int		static int
i2c_start(device_t dev, u_char slave, int timeout)		i2c_start(device_t dev, u_char slave, int timeout)
{		{
Show All 25 Lines	i2c_start(device_t dev, u_char slave, int timeout)
WRITE1(sc, I2C_IBCR, reg);		WRITE1(sc, I2C_IBCR, reg);

/* Write target address - LSB is R/W bit */		/* Write target address - LSB is R/W bit */
WRITE1(sc, I2C_IBDR, slave);		WRITE1(sc, I2C_IBDR, slave);

error = wait_for_iif(sc);		error = wait_for_iif(sc);

mtx_unlock(&sc->mutex);		mtx_unlock(&sc->mutex);
if (error) {		if (error != 0) {
vf_i2c_dbg(sc, "cant i2c start: iif error\n");		vf_i2c_dbg(sc, "cant i2c start: iif error\n");
return (error);		return (error);
}		}

return (IIC_NOERR);		return (IIC_NOERR);
}		}

static int		static int
Show All 17 Lines	if (wait_for_nibb(sc) == IIC_ETIMEOUT) {
DELAY(1000);		DELAY(1000);
WRITE1(sc, I2C_IBCR, IBCR_NOACK);		WRITE1(sc, I2C_IBCR, IBCR_NOACK);
}		}
mtx_unlock(&sc->mutex);		mtx_unlock(&sc->mutex);

return (IIC_NOERR);		return (IIC_NOERR);
}		}

		static uint32_t
		i2c_get_div_val(device_t dev)
		{
		struct i2c_softc *sc;
		#ifdef EXT_RESOURCES
		uint64_t clk_freq;
		int error, i;

		sc = device_get_softc(dev);

		if (sc->hwtype == HW_MVF600)
		return 20;

		if (sc->freq == 0)
		return vf610_div_table[nitems(vf610_div_table) - 1].reg_val;

		error = clk_get_freq(sc->clock, &clk_freq);
		if (error != 0) {
		device_printf(dev, "Could not get parent clock frequency. "
		"Using default divider.\n");
		return vf610_div_table[nitems(vf610_div_table) - 1].reg_val;
		}

		for (i = 0; i < nitems(vf610_div_table) - 1; i++)
		if ((clk_freq / vf610_div_table[i].div) <= sc->freq)
		break;

		return vf610_div_table[i].reg_val;
		#else
		sc = device_get_softc(dev);

		if (sc->hwtype == HW_VF610)
		return 0x3F;
		else
		return 20;
		#endif
		}

static int		static int
i2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldadr)		i2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldadr)
{		{
struct i2c_softc *sc;		struct i2c_softc *sc;
		uint32_t div;

sc = device_get_softc(dev);		sc = device_get_softc(dev);
		div = i2c_get_div_val(dev);
		vf_i2c_dbg(sc, "Div val: %02x\n", div);

vf_i2c_dbg(sc, "i2c reset\n");		vf_i2c_dbg(sc, "i2c reset\n");

switch (speed) {		switch (speed) {
case IIC_FAST:		case IIC_FAST:
case IIC_SLOW:		case IIC_SLOW:
case IIC_UNKNOWN:		case IIC_UNKNOWN:
case IIC_FASTEST:		case IIC_FASTEST:
default:		default:
break;		break;
}		}

mtx_lock(&sc->mutex);		mtx_lock(&sc->mutex);
WRITE1(sc, I2C_IBCR, IBCR_MDIS);		WRITE1(sc, I2C_IBCR, IBCR_MDIS);

DELAY(1000);		DELAY(1000);

WRITE1(sc, I2C_IBFD, 20);		WRITE1(sc, I2C_IBFD, div);
WRITE1(sc, I2C_IBCR, 0x0); /* Enable i2c */		WRITE1(sc, I2C_IBCR, 0x0); /* Enable i2c */

DELAY(1000);		DELAY(1000);

mtx_unlock(&sc->mutex);		mtx_unlock(&sc->mutex);

return (IIC_NOERR);		return (IIC_NOERR);
}		}
Show All 21 Lines	if (len) {

/* dummy read */		/* dummy read */
READ1(sc, I2C_IBDR);		READ1(sc, I2C_IBDR);
DELAY(1000);		DELAY(1000);
}		}

while (*read < len) {		while (*read < len) {
error = wait_for_icf(sc);		error = wait_for_icf(sc);
if (error) {		if (error != 0) {
mtx_unlock(&sc->mutex);		mtx_unlock(&sc->mutex);
return (error);		return (error);
}		}

if ((*read == len - 2) && last) {		if ((*read == len - 2) && last) {
/* NO ACK on last byte */		/* NO ACK on last byte */
WRITE1(sc, I2C_IBCR, IBCR_IBIE \| IBCR_MSSL \| \		WRITE1(sc, I2C_IBCR, IBCR_IBIE \| IBCR_MSSL \| \
IBCR_NOACK);		IBCR_NOACK);
Show All 25 Lines	i2c_write(device_t dev, const char buf, int len, int sent, int timeout)
*sent = 0;		*sent = 0;

mtx_lock(&sc->mutex);		mtx_lock(&sc->mutex);
while (*sent < len) {		while (*sent < len) {

WRITE1(sc, I2C_IBDR, *buf++);		WRITE1(sc, I2C_IBDR, *buf++);

error = wait_for_iif(sc);		error = wait_for_iif(sc);
if (error) {		if (error != 0) {
mtx_unlock(&sc->mutex);		mtx_unlock(&sc->mutex);
return (error);		return (error);
}		}

(*sent)++;		(*sent)++;
}		}
mtx_unlock(&sc->mutex);		mtx_unlock(&sc->mutex);

return (IIC_NOERR);		return (IIC_NOERR);
}		}

		static phandle_t
		i2c_get_node(device_t bus, device_t dev)
		{

		return ofw_bus_get_node(bus);
		}

static device_method_t i2c_methods[] = {		static device_method_t i2c_methods[] = {
DEVMETHOD(device_probe, i2c_probe),		DEVMETHOD(device_probe, i2c_probe),
DEVMETHOD(device_attach, i2c_attach),		DEVMETHOD(device_attach, i2c_attach),
		DEVMETHOD(device_detach, i2c_detach),

		DEVMETHOD(ofw_bus_get_node, i2c_get_node),

DEVMETHOD(iicbus_callback, iicbus_null_callback),		DEVMETHOD(iicbus_callback, iicbus_null_callback),
DEVMETHOD(iicbus_repeated_start, i2c_repeated_start),		DEVMETHOD(iicbus_repeated_start, i2c_repeated_start),
DEVMETHOD(iicbus_start, i2c_start),		DEVMETHOD(iicbus_start, i2c_start),
DEVMETHOD(iicbus_stop, i2c_stop),		DEVMETHOD(iicbus_stop, i2c_stop),
DEVMETHOD(iicbus_reset, i2c_reset),		DEVMETHOD(iicbus_reset, i2c_reset),
DEVMETHOD(iicbus_read, i2c_read),		DEVMETHOD(iicbus_read, i2c_read),
DEVMETHOD(iicbus_write, i2c_write),		DEVMETHOD(iicbus_write, i2c_write),
DEVMETHOD(iicbus_transfer, iicbus_transfer_gen),		DEVMETHOD(iicbus_transfer, iicbus_transfer_gen),

{ 0, 0 }		{ 0, 0 }
};		};

static driver_t i2c_driver = {		static driver_t i2c_driver = {
"i2c",		"i2c",
i2c_methods,		i2c_methods,
sizeof(struct i2c_softc),		sizeof(struct i2c_softc),
};		};

static devclass_t i2c_devclass;		static devclass_t i2c_devclass;

DRIVER_MODULE(i2c, simplebus, i2c_driver, i2c_devclass, 0, 0);		DRIVER_MODULE(i2c, simplebus, i2c_driver, i2c_devclass, 0, 0);
DRIVER_MODULE(iicbus, i2c, iicbus_driver, iicbus_devclass, 0, 0);		DRIVER_MODULE(iicbus, i2c, iicbus_driver, iicbus_devclass, 0, 0);
		DRIVER_MODULE(ofw_iicbus, i2c, ofw_iicbus_driver, ofw_iicbus_devclass, 0, 0);