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Message-Id: <1455047238-111358-3-git-send-email-helmut.buchsbaum@gmail.com>
Date: Tue, 9 Feb 2016 20:47:14 +0100
From: Helmut Buchsbaum <helmut.buchsbaum@...il.com>
To: "David S. Miller" <davem@...emloft.net>,
Florian Fainelli <f.fainelli@...il.com>,
Andrew Lunn <andrew@...n.ch>,
Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc: netdev@...r.kernel.org,
Helmut Buchsbaum <helmut.buchsbaum@...il.com>
Subject: [PATCH v3 2/6] 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@...il.com>
---
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 e848ad9..2803c8e 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;
}
--
2.1.4
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