Re: [PATCH v2 2/2] ethernet: stmmac: dwmac-rk: Add GMAC support for RK3576

On Friday, 9 August 2024 09:16:44 EDT Heiko Stübner wrote:

Hi Detlev,

Am Donnerstag, 8. August 2024, 19:00:18 CEST schrieb Detlev Casanova:

quoted

From: David Wu <redacted>

Add constants and callback functions for the dwmac on RK3576 soc.

Signed-off-by: David Wu <redacted>
[rebase, extracted bindings]
Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
---

 .../net/ethernet/stmicro/stmmac/dwmac-rk.c    | 156 ++++++++++++++++++
 1 file changed, 156 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c

b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c index
7ae04d8d291c8..e1fa8fc9f4012 100644

--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c

@@ -1116,6 +1116,161 @@ static const struct rk_gmac_ops rk3568_ops = {

 	},
 
 };

[...]

quoted

+/* SDGMAC_GRF */
+#define RK3576_GRF_GMAC_CON0			0X0020
+#define RK3576_GRF_GMAC_CON1			0X0024
+
+#define RK3576_GMAC_RMII_MODE			GRF_BIT(3)
+#define RK3576_GMAC_RGMII_MODE			GRF_CLR_BIT(3)
+
+#define RK3576_GMAC_CLK_SELET_IO		GRF_BIT(7)
+#define RK3576_GMAC_CLK_SELET_CRU		GRF_CLR_BIT(7)

nit: typos _CLK_SELECT_ ... missing the C in select

Ack

quoted

+
+#define RK3576_GMAC_CLK_RMII_DIV2		GRF_BIT(5)
+#define RK3576_GMAC_CLK_RMII_DIV20		GRF_CLR_BIT(5)

I think those are backwards
The TRM says bit[5]=0: 25MHz (DIV2) and bit[5]=1: 2.5MHz (DIV20)

I guess nobody also on Rockchip's side tested a RMII phy on those controllrs

Can't be sure about that. An error in the TRM is not impossible either, as for 
rk3588, it is also bit[5]=0: DIV20 and bit[5]=1: DIV2. I can switch them to 
match the TRM though, we may never now.

quoted

+
+#define RK3576_GMAC_CLK_RGMII_DIV1		\
+			(GRF_CLR_BIT(6) | GRF_CLR_BIT(5))
+#define RK3576_GMAC_CLK_RGMII_DIV5		\
+			(GRF_BIT(6) | GRF_BIT(5))
+#define RK3576_GMAC_CLK_RGMII_DIV50		\
+			(GRF_BIT(6) | GRF_CLR_BIT(5))
+

in contrast, these are correct and match the TRM

quoted

+#define RK3576_GMAC_CLK_RMII_GATE		GRF_BIT(4)
+#define RK3576_GMAC_CLK_RMII_NOGATE		GRF_CLR_BIT(4)
+
+static void rk3576_set_to_rgmii(struct rk_priv_data *bsp_priv,
+				int tx_delay, int rx_delay)
+{
+	struct device *dev = &bsp_priv->pdev->dev;
+	unsigned int offset_con;
+
+	if (IS_ERR(bsp_priv->grf) || IS_ERR(bsp_priv->php_grf)) {
+		dev_err(dev, "Missing rockchip,grf or rockchip,php_grf 

property\n");

quoted

+		return;
+	}
+
+	offset_con = bsp_priv->id == 1 ? RK3576_GRF_GMAC_CON1 :
+					 RK3576_GRF_GMAC_CON0;
+
+	regmap_write(bsp_priv->grf, offset_con, RK3576_GMAC_RGMII_MODE);
+
+	offset_con = bsp_priv->id == 1 ? RK3576_VCCIO0_1_3_IOC_CON4 :
+					 

RK3576_VCCIO0_1_3_IOC_CON2;

quoted

+
+	/* m0 && m1 delay enabled */
+	regmap_write(bsp_priv->php_grf, offset_con,
+		     DELAY_ENABLE(RK3576, tx_delay, rx_delay));
+	regmap_write(bsp_priv->php_grf, offset_con + 0x4,
+		     DELAY_ENABLE(RK3576, tx_delay, rx_delay));
+
+	/* m0 && m1 delay value */
+	regmap_write(bsp_priv->php_grf, offset_con,
+		     RK3576_GMAC_CLK_TX_DL_CFG(tx_delay) |
+		     RK3576_GMAC_CLK_RX_DL_CFG(rx_delay));
+	regmap_write(bsp_priv->php_grf, offset_con + 0x4,
+		     RK3576_GMAC_CLK_TX_DL_CFG(tx_delay) |
+		     RK3576_GMAC_CLK_RX_DL_CFG(rx_delay));
+}
+
+static void rk3576_set_to_rmii(struct rk_priv_data *bsp_priv)
+{
+	struct device *dev = &bsp_priv->pdev->dev;
+	unsigned int offset_con;
+
+	if (IS_ERR(bsp_priv->php_grf)) {
+		dev_err(dev, "%s: Missing rockchip,php_grf property\n", 

__func__);

quoted

+		return;
+	}
+
+	offset_con = bsp_priv->id == 1 ? RK3576_GRF_GMAC_CON1 :
+					 RK3576_GRF_GMAC_CON0;
+
+	regmap_write(bsp_priv->grf, offset_con, RK3576_GMAC_RMII_MODE);
+}
+
+static void rk3576_set_gmac_speed(struct rk_priv_data *bsp_priv, int
speed) +{
+	struct device *dev = &bsp_priv->pdev->dev;
+	unsigned int val = 0, offset_con;
+
+	switch (speed) {
+	case 10:
+		if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII)
+			val = RK3576_GMAC_CLK_RMII_DIV20;
+		else
+			val = RK3576_GMAC_CLK_RGMII_DIV50;

		val = bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII ?
				RK3576_GMAC_CLK_RMII_DIV20 :
				RK3576_GMAC_CLK_RGMII_DIV50;
perhaps?

This way matches how it is written in rk3588_set_gmac_speed(). I find that 
having similar code for similar functions helps reading and understanding it 
better (although I agree that your suggestion looks better).

I'd rather keep it like it is for now if that's ok.

quoted

+		break;
+	case 100:
+		if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII)
+			val = RK3576_GMAC_CLK_RMII_DIV2;
+		else
+			val = RK3576_GMAC_CLK_RGMII_DIV5;

same as above?

quoted

+		break;
+	case 1000:
+		if (bsp_priv->phy_iface != PHY_INTERFACE_MODE_RMII)
+			val = RK3576_GMAC_CLK_RGMII_DIV1;
+		else
+			goto err;

		if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII)
			goto err;

		val = RK3576_GMAC_CLK_RGMII_DIV1;

quoted

+		break;
+	default:
+		goto err;
+	}
+
+	offset_con = bsp_priv->id == 1 ? RK3576_GRF_GMAC_CON1 :
+					 RK3576_GRF_GMAC_CON0;
+
+	regmap_write(bsp_priv->grf, offset_con, val);
+
+	return;
+err:
+	dev_err(dev, "unknown speed value for GMAC speed=%d", speed);
+}
+
+static void rk3576_set_clock_selection(struct rk_priv_data *bsp_priv,
bool input, +				       bool enable)
+{
+	unsigned int val = input ? RK3576_GMAC_CLK_SELET_IO :
+				   RK3576_GMAC_CLK_SELET_CRU;
+	unsigned int offset_con;
+
+	val |= enable ? RK3576_GMAC_CLK_RMII_NOGATE :
+			RK3576_GMAC_CLK_RMII_GATE;
+
+	offset_con = bsp_priv->id == 1 ? RK3576_GRF_GMAC_CON1 :
+					 RK3576_GRF_GMAC_CON0;

nit: alignment of both looks like it could be nicer

That's strange, the alignments looks good in vim and git diff. It also looks 
nice on the archive: https://lore.kernel.org/linux-rockchip/
20240808170113.82775-3-detlev.casanova@collabora.com/
 

Regards,
Detlev