| Message ID | 1377267365-24057-5-git-send-email-zonque@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Friday 23 August 2013 07:46 PM, Daniel Mack wrote: > The cpsw currently lacks code to properly set up the hardware interface > mode on AM33xx. Other platforms might be equally affected. > > Usually, the bootloader will configure the control module register, so > probably that's why such support wasn't needed in the past. In suspend > mode though, this register is modified, and so it needs reprogramming > after resume. > > This patch adds code that makes use of the previously added and optional > support for passing the control mode register, and configures the > correct register bits when the slave is opened. > > The AM33xx also has a bit for each slave to configure the RMII reference > clock direction. Setting it is now supported by a per-slave DT property. > > This code path introducted by this patch is currently exclusive for > am33xx. > > Signed-off-by: Daniel Mack <zonque@gmail.com> > --- > Documentation/devicetree/bindings/net/cpsw.txt | 2 + > drivers/net/ethernet/ti/cpsw.c | 61 ++++++++++++++++++++++++++ > drivers/net/ethernet/ti/cpsw.h | 1 + > 3 files changed, 64 insertions(+) > > diff --git a/Documentation/devicetree/bindings/net/cpsw.txt b/Documentation/devicetree/bindings/net/cpsw.txt > index b717458..0895a51 100644 > --- a/Documentation/devicetree/bindings/net/cpsw.txt > +++ b/Documentation/devicetree/bindings/net/cpsw.txt > @@ -34,6 +34,8 @@ Required properties: > - phy_id : Specifies slave phy id > - phy-mode : The interface between the SoC and the PHY (a string > that of_get_phy_mode() can understand) > +- ti,rmii-clock-ext : If present, the driver will configure the RMII > + interface to external clock usage > - mac-address : Specifies slave MAC address > > Optional properties: > diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c > index 73c44cb6..86b8f7a 100644 > --- a/drivers/net/ethernet/ti/cpsw.c > +++ b/drivers/net/ethernet/ti/cpsw.c > @@ -138,6 +138,13 @@ do { \ > #define CPSW_CMINTMAX_INTVL (1000 / CPSW_CMINTMIN_CNT) > #define CPSW_CMINTMIN_INTVL ((1000 / CPSW_CMINTMAX_CNT) + 1) > > +#define AM33XX_GMII_SEL_MODE_MII (0) > +#define AM33XX_GMII_SEL_MODE_RMII (1) > +#define AM33XX_GMII_SEL_MODE_RGMII (2) > + > +#define AM33XX_GMII_SEL_RMII2_IO_CLK_EN BIT(7) > +#define AM33XX_GMII_SEL_RMII1_IO_CLK_EN BIT(6) These defined can go into cpsw.h so that we can maintain platform defines in one file. > + > #define cpsw_enable_irq(priv) \ > do { \ > u32 i; \ > @@ -980,6 +987,56 @@ static inline void cpsw_add_dual_emac_def_ale_entries( > priv->host_port, ALE_VLAN, slave->port_vlan); > } > > +static void cpsw_set_phy_interface_mode(struct cpsw_slave *slave, > + struct cpsw_priv *priv) > +{ > + u32 reg, mask, mode = 0; Please define each variable in separate line to make it clean. Please check for IS_ERR(gmii_sel_reg) and return if gmii register is not specified in DT then the below code will crash when trying to access gmii_sel_reg. > + > + switch (priv->data.hw_type) { > + case CPSW_TYPE_AM33XX: > + if (!priv->gmii_sel_reg) > + break; > + > + reg = readl(priv->gmii_sel_reg); > + > + if (slave->phy) { > + switch (slave->phy->interface) { > + case PHY_INTERFACE_MODE_MII: > + default: > + mode = AM33XX_GMII_SEL_MODE_MII; > + break; > + case PHY_INTERFACE_MODE_RMII: > + mode = AM33XX_GMII_SEL_MODE_RMII; > + break; > + case PHY_INTERFACE_MODE_RGMII: You need to take care of other RGMII modes as well, for your info AM335xevm phy mode is "rgmii-txid" Regards Mugunthan V N
diff --git a/Documentation/devicetree/bindings/net/cpsw.txt b/Documentation/devicetree/bindings/net/cpsw.txt index b717458..0895a51 100644 --- a/Documentation/devicetree/bindings/net/cpsw.txt +++ b/Documentation/devicetree/bindings/net/cpsw.txt @@ -34,6 +34,8 @@ Required properties: - phy_id : Specifies slave phy id - phy-mode : The interface between the SoC and the PHY (a string that of_get_phy_mode() can understand) +- ti,rmii-clock-ext : If present, the driver will configure the RMII + interface to external clock usage - mac-address : Specifies slave MAC address Optional properties: diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index 73c44cb6..86b8f7a 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -138,6 +138,13 @@ do { \ #define CPSW_CMINTMAX_INTVL (1000 / CPSW_CMINTMIN_CNT) #define CPSW_CMINTMIN_INTVL ((1000 / CPSW_CMINTMAX_CNT) + 1) +#define AM33XX_GMII_SEL_MODE_MII (0) +#define AM33XX_GMII_SEL_MODE_RMII (1) +#define AM33XX_GMII_SEL_MODE_RGMII (2) + +#define AM33XX_GMII_SEL_RMII2_IO_CLK_EN BIT(7) +#define AM33XX_GMII_SEL_RMII1_IO_CLK_EN BIT(6) + #define cpsw_enable_irq(priv) \ do { \ u32 i; \ @@ -980,6 +987,56 @@ static inline void cpsw_add_dual_emac_def_ale_entries( priv->host_port, ALE_VLAN, slave->port_vlan); } +static void cpsw_set_phy_interface_mode(struct cpsw_slave *slave, + struct cpsw_priv *priv) +{ + u32 reg, mask, mode = 0; + + switch (priv->data.hw_type) { + case CPSW_TYPE_AM33XX: + if (!priv->gmii_sel_reg) + break; + + reg = readl(priv->gmii_sel_reg); + + if (slave->phy) { + switch (slave->phy->interface) { + case PHY_INTERFACE_MODE_MII: + default: + mode = AM33XX_GMII_SEL_MODE_MII; + break; + case PHY_INTERFACE_MODE_RMII: + mode = AM33XX_GMII_SEL_MODE_RMII; + break; + case PHY_INTERFACE_MODE_RGMII: + mode = AM33XX_GMII_SEL_MODE_RGMII; + break; + }; + } + + mask = 0x3 << (slave->slave_num * 2) | + BIT(slave->slave_num + 6); + mode <<= slave->slave_num * 2; + + if (slave->data->rmii_clock_external) { + if (slave->slave_num == 0) + mode |= AM33XX_GMII_SEL_RMII1_IO_CLK_EN; + else + mode |= AM33XX_GMII_SEL_RMII2_IO_CLK_EN; + } + + reg &= ~mask; + reg |= mode; + + writel(reg, priv->gmii_sel_reg); + break; + + default: + break; + + } +} + static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv) { char name[32]; @@ -1028,6 +1085,8 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv) slave->phy->phy_id); phy_start(slave->phy); } + + cpsw_set_phy_interface_mode(slave, priv); } static inline void cpsw_add_default_vlan(struct cpsw_priv *priv) @@ -1823,6 +1882,8 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data, memcpy(slave_data->mac_addr, mac_addr, ETH_ALEN); slave_data->phy_if = of_get_phy_mode(slave_node); + if (of_find_property(slave_node, "ti,rmii-clock-ext", NULL)) + slave_data->rmii_clock_external = true; if (data->dual_emac) { if (of_property_read_u32(slave_node, "dual_emac_res_vlan", diff --git a/drivers/net/ethernet/ti/cpsw.h b/drivers/net/ethernet/ti/cpsw.h index 96c374a..3baa2350 100644 --- a/drivers/net/ethernet/ti/cpsw.h +++ b/drivers/net/ethernet/ti/cpsw.h @@ -19,6 +19,7 @@ struct cpsw_slave_data { char phy_id[MII_BUS_ID_SIZE]; int phy_if; + bool rmii_clock_external; u8 mac_addr[ETH_ALEN]; u16 dual_emac_res_vlan; /* Reserved VLAN for DualEMAC */ };
The cpsw currently lacks code to properly set up the hardware interface mode on AM33xx. Other platforms might be equally affected. Usually, the bootloader will configure the control module register, so probably that's why such support wasn't needed in the past. In suspend mode though, this register is modified, and so it needs reprogramming after resume. This patch adds code that makes use of the previously added and optional support for passing the control mode register, and configures the correct register bits when the slave is opened. The AM33xx also has a bit for each slave to configure the RMII reference clock direction. Setting it is now supported by a per-slave DT property. This code path introducted by this patch is currently exclusive for am33xx. Signed-off-by: Daniel Mack <zonque@gmail.com> --- Documentation/devicetree/bindings/net/cpsw.txt | 2 + drivers/net/ethernet/ti/cpsw.c | 61 ++++++++++++++++++++++++++ drivers/net/ethernet/ti/cpsw.h | 1 + 3 files changed, 64 insertions(+)