From 484e36ff18341ca1fca4258139100b2e90530f53 Mon Sep 17 00:00:00 2001 From: Helmut Buchsbaum Date: Tue, 9 Feb 2016 20:47:14 +0100 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- drivers/net/phy/spi_ks8995.c | 118 ++++++++++++++++++++++++----------- 1 file changed, 80 insertions(+), 38 deletions(-) diff --git a/drivers/net/phy/spi_ks8995.c b/drivers/net/phy/spi_ks8995.c index e7a215d2b1ae..5e66d4bd7325 100644 --- a/drivers/net/phy/spi_ks8995.c +++ b/drivers/net/phy/spi_ks8995.c @@ -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; } -- 2.39.5