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-rw-r--r--sys/dev/iicbus/icee.c157
1 files changed, 120 insertions, 37 deletions
diff --git a/sys/dev/iicbus/icee.c b/sys/dev/iicbus/icee.c
index 800ec4c..fffb356 100644
--- a/sys/dev/iicbus/icee.c
+++ b/sys/dev/iicbus/icee.c
@@ -27,6 +27,9 @@ __FBSDID("$FreeBSD$");
/*
* Generic IIC eeprom support, modeled after the AT24C family of products.
*/
+
+#include "opt_platform.h"
+
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
@@ -37,26 +40,73 @@ __FBSDID("$FreeBSD$");
#include <sys/sx.h>
#include <sys/uio.h>
#include <machine/bus.h>
+
+#ifdef FDT
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#endif
+
#include <dev/iicbus/iiconf.h>
#include <dev/iicbus/iicbus.h>
#include "iicbus_if.h"
-#define IIC_M_WR 0 /* write operation */
+/*
+ * AT24 parts have a "write page size" that differs per-device, and a "read page
+ * size" that is always equal to the full device size. We define maximum values
+ * here to limit how long we occupy the bus with a single transfer, and because
+ * there are temporary buffers of these sizes allocated on the stack.
+ */
#define MAX_RD_SZ 256 /* Largest read size we support */
-#define MAX_WR_SZ 256 /* Largest write size we support */
+#define MAX_WR_SZ 256 /* Largest write size we support */
struct icee_softc {
- device_t sc_dev; /* Myself */
- device_t sc_busdev; /* Parent bus */
+ device_t dev; /* Myself */
struct cdev *cdev; /* user interface */
- int addr;
+ int addr; /* Slave address on the bus */
int size; /* How big am I? */
- int type; /* What type 8 or 16 bit? */
- int rd_sz; /* What's the read page size */
+ int type; /* What address type 8 or 16 bit? */
int wr_sz; /* What's the write page size */
};
+#ifdef FDT
+struct eeprom_desc {
+ int type;
+ int size;
+ int wr_sz;
+ const char *name;
+};
+
+static struct eeprom_desc type_desc[] = {
+ { 8, 128, 8, "AT24C01"},
+ { 8, 256, 8, "AT24C02"},
+ { 8, 512, 16, "AT24C04"},
+ { 8, 1024, 16, "AT24C08"},
+ { 8, 2 * 1024, 16, "AT24C16"},
+ {16, 4 * 1024, 32, "AT24C32"},
+ {16, 8 * 1024, 32, "AT24C64"},
+ {16, 16 * 1024, 64, "AT24C128"},
+ {16, 32 * 1024, 64, "AT24C256"},
+ {16, 64 * 1024, 128, "AT24C512"},
+ {16, 128 * 1024, 256, "AT24CM01"},
+};
+
+static struct ofw_compat_data compat_data[] = {
+ {"atmel,24c01", (uintptr_t)(&type_desc[0])},
+ {"atmel,24c02", (uintptr_t)(&type_desc[1])},
+ {"atmel,24c04", (uintptr_t)(&type_desc[2])},
+ {"atmel,24c08", (uintptr_t)(&type_desc[3])},
+ {"atmel,24c16", (uintptr_t)(&type_desc[4])},
+ {"atmel,24c32", (uintptr_t)(&type_desc[5])},
+ {"atmel,24c64", (uintptr_t)(&type_desc[6])},
+ {"atmel,24c128", (uintptr_t)(&type_desc[7])},
+ {"atmel,24c256", (uintptr_t)(&type_desc[8])},
+ {"atmel,24c512", (uintptr_t)(&type_desc[9])},
+ {"atmel,24c1024", (uintptr_t)(&type_desc[10])},
+ {NULL, (uintptr_t)NULL},
+};
+#endif
+
#define CDEV2SOFTC(dev) ((dev)->si_drv1)
/* cdev routines */
@@ -75,6 +125,39 @@ static struct cdevsw icee_cdevsw =
.d_write = icee_write
};
+#ifdef FDT
+static int
+icee_probe(device_t dev)
+{
+ struct eeprom_desc *d;
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ d = (struct eeprom_desc *)
+ ofw_bus_search_compatible(dev, compat_data)->ocd_data;
+ if (d == NULL)
+ return (ENXIO);
+
+ device_set_desc(dev, d->name);
+ return (BUS_PROBE_DEFAULT);
+}
+
+static void
+icee_init(struct icee_softc *sc)
+{
+ struct eeprom_desc *d;
+
+ d = (struct eeprom_desc *)
+ ofw_bus_search_compatible(sc->dev, compat_data)->ocd_data;
+ if (d == NULL)
+ return; /* attach will see sc->size == 0 and return error */
+
+ sc->size = d->size;
+ sc->type = d->type;
+ sc->wr_sz = d->wr_sz;
+}
+#else /* !FDT */
static int
icee_probe(device_t dev)
{
@@ -83,37 +166,44 @@ icee_probe(device_t dev)
return (BUS_PROBE_NOWILDCARD);
}
-static int
-icee_attach(device_t dev)
+static void
+icee_init(struct icee_softc *sc)
{
- struct icee_softc *sc = device_get_softc(dev);
const char *dname;
- int dunit, err;
+ int dunit;
- sc->sc_dev = dev;
- sc->sc_busdev = device_get_parent(sc->sc_dev);
- sc->addr = iicbus_get_addr(dev);
- err = 0;
- dname = device_get_name(dev);
- dunit = device_get_unit(dev);
+ dname = device_get_name(sc->dev);
+ dunit = device_get_unit(sc->dev);
resource_int_value(dname, dunit, "size", &sc->size);
resource_int_value(dname, dunit, "type", &sc->type);
- resource_int_value(dname, dunit, "rd_sz", &sc->rd_sz);
- if (sc->rd_sz > MAX_RD_SZ)
- sc->rd_sz = MAX_RD_SZ;
resource_int_value(dname, dunit, "wr_sz", &sc->wr_sz);
+}
+#endif /* FDT */
+
+static int
+icee_attach(device_t dev)
+{
+ struct icee_softc *sc = device_get_softc(dev);
+
+ sc->dev = dev;
+ sc->addr = iicbus_get_addr(dev);
+ icee_init(sc);
+ if (sc->size == 0 || sc->type == 0 || sc->wr_sz == 0) {
+ device_printf(sc->dev, "Missing config data, "
+ "these cannot be zero: size %d type %d wr_sz %d\n",
+ sc->size, sc->type, sc->wr_sz);
+ return (EINVAL);
+ }
if (bootverbose)
- device_printf(dev, "size: %d bytes bus_width: %d-bits\n",
+ device_printf(dev, "size: %d bytes, addressing: %d-bits\n",
sc->size, sc->type);
sc->cdev = make_dev(&icee_cdevsw, device_get_unit(dev), UID_ROOT,
GID_WHEEL, 0600, "icee%d", device_get_unit(dev));
if (sc->cdev == NULL) {
- err = ENOMEM;
- goto out;
+ return (ENOMEM);
}
sc->cdev->si_drv1 = sc;
-out:
- return (err);
+ return (0);
}
static int
@@ -149,14 +239,11 @@ icee_read(struct cdev *dev, struct uio *uio, int ioflag)
return (EIO);
if (sc->type != 8 && sc->type != 16)
return (EINVAL);
- error = iicbus_request_bus(sc->sc_busdev, sc->sc_dev, IIC_INTRWAIT);
- if (error!= 0)
- return (iic2errno(error));
slave = error = 0;
while (uio->uio_resid > 0) {
if (uio->uio_offset >= sc->size)
break;
- len = MIN(sc->rd_sz - (uio->uio_offset & (sc->rd_sz - 1)),
+ len = MIN(MAX_RD_SZ - (uio->uio_offset & (MAX_RD_SZ - 1)),
uio->uio_resid);
switch (sc->type) {
case 8:
@@ -175,7 +262,7 @@ icee_read(struct cdev *dev, struct uio *uio, int ioflag)
}
for (i = 0; i < 2; i++)
msgs[i].slave = slave;
- error = iicbus_transfer(sc->sc_dev, msgs, 2);
+ error = iicbus_transfer_excl(sc->dev, msgs, 2, IIC_INTRWAIT);
if (error) {
error = iic2errno(error);
break;
@@ -184,7 +271,6 @@ icee_read(struct cdev *dev, struct uio *uio, int ioflag)
if (error)
break;
}
- iicbus_release_bus(sc->sc_busdev, sc->sc_dev);
return (error);
}
@@ -213,9 +299,6 @@ icee_write(struct cdev *dev, struct uio *uio, int ioflag)
if (sc->type != 8 && sc->type != 16)
return (EINVAL);
- error = iicbus_request_bus(sc->sc_busdev, sc->sc_dev, IIC_INTRWAIT);
- if (error!= 0)
- return (iic2errno(error));
slave = error = 0;
while (uio->uio_resid > 0) {
if (uio->uio_offset >= sc->size)
@@ -239,7 +322,7 @@ icee_write(struct cdev *dev, struct uio *uio, int ioflag)
error = uiomove(data + sc->type / 8, len, uio);
if (error)
break;
- error = iicbus_transfer(sc->sc_dev, wr, 1);
+ error = iicbus_transfer_excl(sc->dev, wr, 1, IIC_INTRWAIT);
if (error) {
error = iic2errno(error);
break;
@@ -248,14 +331,14 @@ icee_write(struct cdev *dev, struct uio *uio, int ioflag)
waitlimit = 10000;
rd[0].slave = slave;
do {
- error = iicbus_transfer(sc->sc_dev, rd, 1);
+ error = iicbus_transfer_excl(sc->dev, rd, 1,
+ IIC_INTRWAIT);
} while (waitlimit-- > 0 && error != 0);
if (error) {
error = iic2errno(error);
break;
}
}
- iicbus_release_bus(sc->sc_busdev, sc->sc_dev);
return error;
}
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