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Subject[RFC 03/11] net: phy: refactor c45 phy identification sequence
Date
Lets factor out the phy id logic, and make it generic
so that it can be used for c22 and c45.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
---
drivers/net/phy/phy_device.c | 65 +++++++++++++++++++-----------------
1 file changed, 35 insertions(+), 30 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 7746c07b97fe..f0761fa5e40b 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -695,6 +695,29 @@ static int get_phy_c45_devs_in_pkg(struct mii_bus *bus, int addr, int dev_addr,
return 0;
}

+static int _get_phy_id(struct mii_bus *bus, int addr, int dev_addr,
+ u32 *phy_id, bool c45)
+{
+ int phy_reg, reg_addr;
+
+ int reg_base = c45 ? (MII_ADDR_C45 | dev_addr << 16) : 0;
+
+ reg_addr = reg_base | MII_PHYSID1;
+ phy_reg = mdiobus_read(bus, addr, reg_addr);
+ if (phy_reg < 0)
+ return -EIO;
+
+ *phy_id = phy_reg << 16;
+
+ reg_addr = reg_base | MII_PHYSID2;
+ phy_reg = mdiobus_read(bus, addr, reg_addr);
+ if (phy_reg < 0)
+ return -EIO;
+ *phy_id |= phy_reg;
+
+ return 0;
+}
+
static bool valid_phy_id(int val)
{
return (val > 0 && ((val & 0x1fffffff) != 0x1fffffff));
@@ -715,17 +738,17 @@ static bool valid_phy_id(int val)
*/
static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
struct phy_c45_device_ids *c45_ids) {
- int phy_reg;
- int i, reg_addr;
+ int ret;
+ int i;
const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
u32 *devs = &c45_ids->devices_in_package;

/* Find first non-zero Devices In package. Device zero is reserved
* for 802.3 c45 complied PHYs, so don't probe it at first.
*/
- for (i = 1; i < num_ids && *devs == 0; i++) {
- phy_reg = get_phy_c45_devs_in_pkg(bus, addr, i, devs);
- if (phy_reg < 0)
+ for (i = 0; i < num_ids && *devs == 0; i++) {
+ ret = get_phy_c45_devs_in_pkg(bus, addr, i, devs);
+ if (ret < 0)
return -EIO;

if ((*devs & 0x1fffffff) == 0x1fffffff) {
@@ -752,17 +775,9 @@ static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
if (!(c45_ids->devices_in_package & (1 << i)))
continue;

- reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID1;
- phy_reg = mdiobus_read(bus, addr, reg_addr);
- if (phy_reg < 0)
- return -EIO;
- c45_ids->device_ids[i] = phy_reg << 16;
-
- reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID2;
- phy_reg = mdiobus_read(bus, addr, reg_addr);
- if (phy_reg < 0)
- return -EIO;
- c45_ids->device_ids[i] |= phy_reg;
+ ret = _get_phy_id(bus, addr, i, &c45_ids->device_ids[i], true);
+ if (ret < 0)
+ return ret;
}
*phy_id = 0;
return 0;
@@ -787,27 +802,17 @@ static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id,
bool is_c45, struct phy_c45_device_ids *c45_ids)
{
- int phy_reg;
+ int ret;

if (is_c45)
return get_phy_c45_ids(bus, addr, phy_id, c45_ids);

- /* Grab the bits from PHYIR1, and put them in the upper half */
- phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
- if (phy_reg < 0) {
+ ret = _get_phy_id(bus, addr, 0, phy_id, false);
+ if (ret < 0) {
/* returning -ENODEV doesn't stop bus scanning */
- return (phy_reg == -EIO || phy_reg == -ENODEV) ? -ENODEV : -EIO;
+ return (ret == -EIO || ret == -ENODEV) ? -ENODEV : -EIO;
}

- *phy_id = phy_reg << 16;
-
- /* Grab the bits from PHYIR2, and put them in the lower half */
- phy_reg = mdiobus_read(bus, addr, MII_PHYSID2);
- if (phy_reg < 0)
- return -EIO;
-
- *phy_id |= phy_reg;
-
return 0;
}

--
2.26.2
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