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net: phy: spi_ks8995: verify chip and determine revision 

Since the chip variant is now determined by spi_device_id, verify
family and chip id and determine the revision id.

Signed-off-by: Helmut Buchsbaum <helmut.buchsbaum@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Helmut Buchsbaum 2016-02-09 20:47:14 +01:00 committed by David S. Miller
parent aa54c8da9a
commit 484e36ff18
1 changed files with 80 additions and 38 deletions
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118
drivers/net/phy/spi_ks8995.c
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@ -83,6 +83,8 @@
#define FAMILY_KS8995 0x95
#define CHIPID_M 0
#define KS8995_CHIP_ID 0x00
#define KSZ8864_CHIP_ID 0x01
#define KS8995_CMD_WRITE 0x02U
#define KS8995_CMD_READ 0x03U
@ -97,16 +99,22 @@ enum ks8995_chip_variant {
struct ks8995_chip_params {
char *name;
int family_id;
int chip_id;
int regs_size;
};
static const struct ks8995_chip_params ks8995_chip[] = {
[ks8995] = {
.name = "KS8995MA",
.family_id = FAMILY_KS8995,
.chip_id = KS8995_CHIP_ID,
.regs_size = KS8995_REGS_SIZE,
},
[ksz8864] = {
.name = "KSZ8864RMN",
.family_id = FAMILY_KS8995,
.chip_id = KSZ8864_CHIP_ID,
.regs_size = KSZ8864_REGS_SIZE,
},
};
@ -121,6 +129,7 @@ struct ks8995_switch {
struct ks8995_pdata *pdata;
struct bin_attribute regs_attr;
const struct ks8995_chip_params *chip;
int revision_id;
};
static const struct spi_device_id ks8995_id[] = {
@ -263,6 +272,73 @@ static ssize_t ks8995_registers_write(struct file *filp, struct kobject *kobj,
return ks8995_write(ks8995, buf, off, count);
}
/* ks8995_get_revision - get chip revision
* @ks: pointer to switch instance
*
* Verify chip family and id and get chip revision.
*/
static int ks8995_get_revision(struct ks8995_switch *ks)
{
int err;
u8 id0, id1, ksz8864_id;
/* read family id */
err = ks8995_read_reg(ks, KS8995_REG_ID0, &id0);
if (err) {
err = -EIO;
goto err_out;
}
/* verify family id */
if (id0 != ks->chip->family_id) {
dev_err(&ks->spi->dev, "chip family id mismatch: expected 0x%02x but 0x%02x read\n",
ks->chip->family_id, id0);
err = -ENODEV;
goto err_out;
}
switch (ks->chip->family_id) {
case FAMILY_KS8995:
/* try reading chip id at CHIP ID1 */
err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
if (err) {
err = -EIO;
goto err_out;
}
/* verify chip id */
if ((get_chip_id(id1) == CHIPID_M) &&
(get_chip_id(id1) == ks->chip->chip_id)) {
/* KS8995MA */
ks->revision_id = get_chip_rev(id1);
} else if (get_chip_id(id1) != CHIPID_M) {
/* KSZ8864RMN */
err = ks8995_read_reg(ks, KS8995_REG_ID1, &ksz8864_id);
if (err) {
err = -EIO;
goto err_out;
}
if ((ksz8864_id & 0x80) &&
(ks->chip->chip_id == KSZ8864_CHIP_ID)) {
ks->revision_id = get_chip_rev(id1);
}
} else {
dev_err(&ks->spi->dev, "unsupported chip id for KS8995 family: 0x%02x\n",
id1);
err = -ENODEV;
}
break;
default:
dev_err(&ks->spi->dev, "unsupported family id: 0x%02x\n", id0);
err = -ENODEV;
break;
}
err_out:
return err;
}
static const struct bin_attribute ks8995_registers_attr = {
.attr = {
.name = "registers",
@ -278,7 +354,6 @@ static int ks8995_probe(struct spi_device *spi)
{
struct ks8995_switch *ks;
struct ks8995_pdata *pdata;
u8 ids[2];
int err;
int variant = spi_get_device_id(spi)->driver_data;
@ -309,39 +384,12 @@ static int ks8995_probe(struct spi_device *spi)
return err;
}
err = ks8995_read(ks, ids, KS8995_REG_ID0, sizeof(ids));
if (err < 0) {
dev_err(&spi->dev, "unable to read id registers, err=%d\n",
err);
err = ks8995_get_revision(ks);
if (err)
return err;
}
switch (ids[0]) {
case FAMILY_KS8995:
break;
default:
dev_err(&spi->dev, "unknown family id:%02x\n", ids[0]);
return -ENODEV;
}
ks->regs_attr.size = ks->chip->regs_size;
memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));
if (get_chip_id(ids[1]) != CHIPID_M) {
u8 val;
/* Check if this is a KSZ8864RMN */
err = ks8995_read(ks, &val, KSZ8864_REG_ID1, sizeof(val));
if (err < 0) {
dev_err(&spi->dev,
"unable to read chip id register, err=%d\n",
err);
return err;
}
if ((val & 0x80) == 0) {
dev_err(&spi->dev, "unknown chip:%02x,0\n", ids[1]);
return err;
}
}
err = ks8995_reset(ks);
if (err)
@ -354,14 +402,8 @@ static int ks8995_probe(struct spi_device *spi)
return err;
}
if (get_chip_id(ids[1]) == CHIPID_M) {
dev_info(&spi->dev,
"KS8995 device found, Chip ID:%x, Revision:%x\n",
get_chip_id(ids[1]), get_chip_rev(ids[1]));
} else {
dev_info(&spi->dev, "KSZ8864 device found, Revision:%x\n",
get_chip_rev(ids[1]));
}
dev_info(&spi->dev, "%s device found, Chip ID:%x, Revision:%x\n",
ks->chip->name, ks->chip->chip_id, ks->revision_id);
return 0;
}