[PATCH net-next 1/3] net: ethernet: mediatek: get the chip id by ETHDMASYS registers

Nelson Chang
2016-10-03T07:18:49Z

The driver gets the chip id by ETHSYS_CHIPID0_3/ETHSYS_CHIPID4_7 registers
in mtk_probe().

Signed-off-by: Nelson Chang <nelson.chang@mediatek.com>
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 27 +++++++++++++++++++++++++++
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 5 +++++
2 files changed, 32 insertions(+)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index ad4ab97..a3e4ae6 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2323,6 +2323,27 @@ free_netdev:
return err;
}

+static u32 mtk_get_chip_id(struct mtk_eth *eth)
+{
+ u32 val[2], id[4];
+ u32 chip_id;
+
+ regmap_read(eth->ethsys, ETHSYS_CHIPID0_3, &val[0]);
+ regmap_read(eth->ethsys, ETHSYS_CHIPID4_7, &val[1]);
+
+ id[3] = ((val[0] >> 16) & 0xff) - '0';
+ id[2] = ((val[0] >> 24) & 0xff) - '0';
+ id[1] = (val[1] & 0xff) - '0';
+ id[0] = ((val[1] >> 8) & 0xff) - '0';
+
+ chip_id = (id[3] * 1000) + (id[2] * 100) +
+ (id[1] * 10) + id[0];
+
+ dev_info(eth->dev, "chip id = %d\n", chip_id);
+
+ return chip_id;
+}
+
static int mtk_probe(struct platform_device *pdev)
{
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -2388,6 +2409,12 @@ static int mtk_probe(struct platform_device *pdev)
if (err)
return err;

+ eth->chip_id = mtk_get_chip_id(eth);
+ if (!eth->chip_id) {
+ dev_err(&pdev->dev, "failed to get chip id\n");
+ return -ENODEV;
+ }
+
for_each_child_of_node(pdev->dev.of_node, mac_np) {
if (!of_device_is_compatible(mac_np,
"mediatek,eth-mac"))
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 3003195..a5b422b 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -342,6 +342,10 @@
#define GPIO_BIAS_CTRL 0xed0
#define GPIO_DRV_SEL10 0xf00

+/* ethernet subsystem chip id register */
+#define ETHSYS_CHIPID0_3 0x0
+#define ETHSYS_CHIPID4_7 0x4
+
/* ethernet subsystem config register */
#define ETHSYS_SYSCFG0 0x14
#define SYSCFG0_GE_MASK 0x3
@@ -534,6 +538,7 @@ struct mtk_eth {
unsigned long sysclk;
struct regmap *ethsys;
struct regmap *pctl;
+ u32 chip_id;
bool hwlro;
atomic_t dma_refcnt;
struct mtk_tx_ring tx_ring;
--
1.9.1