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Subject[PATCH v2 09/15] net: dsa: Add support for switch EEPROM access
Date
On some chips it is possible to access the switch eeprom.
Add infrastructure support for it.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
v2:
- Add support for configuring switch EEPROM size through platform data
or devicetree data
- Do not compare new pointers against NULL
- Check if get_eeprom pointer is set before calling it

include/net/dsa.h | 10 ++++++++++
net/dsa/dsa.c | 4 ++++
net/dsa/slave.c | 41 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 55 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 55e75e7..37856a2 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -38,6 +38,9 @@ struct dsa_chip_data {
struct device *host_dev;
int sw_addr;

+ /* set to size of eeprom if supported by the switch */
+ int eeprom_len;
+
/* Device tree node pointer for this specific switch chip
* used during switch setup in case additional properties
* and resources needs to be used
@@ -258,6 +261,13 @@ struct dsa_switch_driver {
int (*set_temp_limit)(struct dsa_switch *ds, int temp);
int (*get_temp_alarm)(struct dsa_switch *ds, bool *alarm);
#endif
+
+ /* EEPROM access */
+ int (*get_eeprom_len)(struct dsa_switch *ds);
+ int (*get_eeprom)(struct dsa_switch *ds,
+ struct ethtool_eeprom *eeprom, u8 *data);
+ int (*set_eeprom)(struct dsa_switch *ds,
+ struct ethtool_eeprom *eeprom, u8 *data);
};

void register_switch_driver(struct dsa_switch_driver *type);
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 5edbbca..1c1b925 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -575,6 +575,7 @@ static int dsa_of_probe(struct platform_device *pdev)
const char *port_name;
int chip_index, port_index;
const unsigned int *sw_addr, *port_reg;
+ u32 eeprom_length;
int ret;

mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
@@ -603,6 +604,9 @@ static int dsa_of_probe(struct platform_device *pdev)
if (pd->nr_chips > DSA_MAX_SWITCHES)
pd->nr_chips = DSA_MAX_SWITCHES;

+ if (!of_property_read_u32(np, "eeprom-length", &eeprom_length))
+ pd->eeprom_length = eeprom_length;
+
pd->chip = kzalloc(pd->nr_chips * sizeof(struct dsa_chip_data),
GFP_KERNEL);
if (!pd->chip) {
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 6d18174..ff2fbe7 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -271,6 +271,44 @@ static u32 dsa_slave_get_link(struct net_device *dev)
return -EOPNOTSUPP;
}

+static int dsa_slave_get_eeprom_len(struct net_device *dev)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ struct dsa_switch *ds = p->parent;
+
+ if (ds->pd->eeprom_len)
+ return ds->pd->eeprom_len;
+
+ if (ds->drv->get_eeprom_len)
+ return ds->drv->get_eeprom_len(ds);
+
+ return 0;
+}
+
+static int dsa_slave_get_eeprom(struct net_device *dev,
+ struct ethtool_eeprom *eeprom, u8 *data)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ struct dsa_switch *ds = p->parent;
+
+ if (ds->drv->get_eeprom)
+ return ds->drv->get_eeprom(ds, eeprom, data);
+
+ return -EOPNOTSUPP;
+}
+
+static int dsa_slave_set_eeprom(struct net_device *dev,
+ struct ethtool_eeprom *eeprom, u8 *data)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ struct dsa_switch *ds = p->parent;
+
+ if (ds->drv->set_eeprom)
+ return ds->drv->set_eeprom(ds, eeprom, data);
+
+ return -EOPNOTSUPP;
+}
+
static void dsa_slave_get_strings(struct net_device *dev,
uint32_t stringset, uint8_t *data)
{
@@ -387,6 +425,9 @@ static const struct ethtool_ops dsa_slave_ethtool_ops = {
.get_drvinfo = dsa_slave_get_drvinfo,
.nway_reset = dsa_slave_nway_reset,
.get_link = dsa_slave_get_link,
+ .get_eeprom_len = dsa_slave_get_eeprom_len,
+ .get_eeprom = dsa_slave_get_eeprom,
+ .set_eeprom = dsa_slave_set_eeprom,
.get_strings = dsa_slave_get_strings,
.get_ethtool_stats = dsa_slave_get_ethtool_stats,
.get_sset_count = dsa_slave_get_sset_count,
--
1.9.1


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