[PATCH net-next 10/13] net: macb: Add "mobileye,eyeq5-gem" compatible

Théo Lebrun
2025-03-21T19:14:13Z

Add support for the two GEM instances inside Mobileye EyeQ5 SoCs, using
compatible "mobileye,eyeq5-gem". With it, add a custom init sequence
that accesses two system-controller registers.

Noteworthy: NET_IP_ALIGN=2 on MIPS but the hardware does not align and
low bits aren't configurable, so we cannot respect the requested IP
header alignment.

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
---
drivers/net/ethernet/cadence/macb_main.c | 95 ++++++++++++++++++++++++++++++++
1 file changed, 95 insertions(+)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 79161d559166478f85a6f8294d488ed961d9be7f..9f2a5bf9a5ebca5941229bd96091a0fb96f0607d 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -22,6 +22,7 @@
#include <linux/iopoll.h>
#include <linux/ip.h>
#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netdevice.h>
@@ -34,6 +35,7 @@
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/ptp_classify.h>
+#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/tcp.h>
@@ -4967,6 +4969,86 @@ static int init_reset_optional(struct platform_device *pdev)
return ret;
}

+#define EYEQ5_OLB_GP_TX_SWRST_DIS BIT(0) // Tx SW reset
+#define EYEQ5_OLB_GP_TX_M_CLKE BIT(1) // Tx M clock enable
+#define EYEQ5_OLB_GP_SYS_SWRST_DIS BIT(2) // Sys SW reset
+#define EYEQ5_OLB_GP_SYS_M_CLKE BIT(3) // Sys clock enable
+#define EYEQ5_OLB_GP_SGMII_MODE BIT(4) // SGMII mode
+#define EYEQ5_OLB_GP_RGMII_DRV GENMASK(8, 5) // RGMII mode
+#define EYEQ5_OLB_GP_SMA_DRV GENMASK(12, 9)
+#define EYEQ5_OLB_GP_RGMII_PD BIT(13) // RGMII pull-down
+#define EYEQ5_OLB_GP_MDIO_PU BIT(14) // RGMII pull-up
+#define EYEQ5_OLB_GP_RGMII_RX_ST BIT(15) // Schmitt trigger on RGMII Rx
+#define EYEQ5_OLB_GP_RGMII_TX_ST BIT(16) // Schmitt trigger on RGMII Tx
+#define EYEQ5_OLB_GP_MDIO_ST BIT(17)
+#define EYEQ5_OLB_GP_MDC_ST BIT(18)
+#define EYEQ5_OLB_GP_MBIST_ENABLE BIT(19)
+
+#define EYEQ5_OLB_SGMII_PWR_EN BIT(0)
+#define EYEQ5_OLB_SGMII_RST_DIS BIT(1)
+#define EYEQ5_OLB_SGMII_PLL_EN BIT(2)
+#define EYEQ5_OLB_SGMII_SIG_DET_SW BIT(3)
+#define EYEQ5_OLB_SGMII_PWR_STATE_MASK GENMASK(8, 4)
+#define EYEQ5_OLB_SGMII_PWR_STATE BIT(4)
+#define EYEQ5_OLB_SGMII_TX_ELECT_IDLE BIT(9) // Tx elect idle
+#define EYEQ5_OLB_SGMII_POWER_ACK BIT(16)
+#define EYEQ5_OLB_SGMII_PLL_ACK BIT(18)
+#define EYEQ5_OLB_SGMII_SIG_DET BIT(19)
+#define EYEQ5_OLB_SGMII_PWR_STATE_ACK GENMASK(24, 20)
+
+static int eyeq5_init(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct net_device *netdev = platform_get_drvdata(pdev);
+ struct macb *bp = netdev_priv(netdev);
+ struct device_node *np = dev->of_node;
+ unsigned int gp, sgmii;
+ struct regmap *regmap;
+ unsigned int args[2];
+ unsigned int reg;
+ int ret;
+
+ regmap = syscon_regmap_lookup_by_phandle_args(np, "mobileye,olb", 2, args);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ gp = args[0];
+ sgmii = args[1];
+
+ /* Forced reset */
+ regmap_write(regmap, gp, 0);
+ regmap_write(regmap, sgmii, 0);
+ usleep_range(5, 20);
+
+ if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) {
+ regmap_write(regmap, gp, EYEQ5_OLB_GP_SGMII_MODE);
+
+ reg = EYEQ5_OLB_SGMII_PWR_EN | EYEQ5_OLB_SGMII_RST_DIS |
+ EYEQ5_OLB_SGMII_PLL_EN;
+ regmap_write(regmap, sgmii, reg);
+
+ ret = regmap_read_poll_timeout(regmap, sgmii, reg,
+ reg & EYEQ5_OLB_SGMII_PLL_ACK,
+ 1, 100);
+ if (ret)
+ return dev_err_probe(dev, ret, "PLL timeout");
+
+ regmap_read(regmap, sgmii, &reg);
+ reg |= EYEQ5_OLB_SGMII_PWR_STATE | EYEQ5_OLB_SGMII_SIG_DET_SW;
+ regmap_write(regmap, sgmii, reg);
+ }
+
+ regmap_read(regmap, gp, &reg);
+ reg &= ~EYEQ5_OLB_GP_RGMII_DRV;
+ if (phy_interface_mode_is_rgmii(bp->phy_interface))
+ reg |= FIELD_PREP(EYEQ5_OLB_GP_RGMII_DRV, 0x9);
+ reg |= EYEQ5_OLB_GP_TX_SWRST_DIS | EYEQ5_OLB_GP_TX_M_CLKE;
+ reg |= EYEQ5_OLB_GP_SYS_SWRST_DIS | EYEQ5_OLB_GP_SYS_M_CLKE;
+ regmap_write(regmap, gp, reg);
+
+ return macb_init(pdev);
+}
+
static const struct macb_usrio_config sama7g5_usrio = {
.mii = 0,
.rmii = 1,
@@ -5135,6 +5217,18 @@ static const struct macb_config versal_config = {
.usrio = &macb_default_usrio,
};

+static const struct macb_config eyeq5_config = {
+ .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO |
+ MACB_CAPS_GEM_HAS_PTP | MACB_CAPS_QUEUE_DISABLE |
+ MACB_CAPS_NO_LSO,
+ .hw_ip_align = 0,
+ .dma_burst_length = 16,
+ .clk_init = macb_clk_init,
+ .init = eyeq5_init,
+ .jumbo_max_len = 10240,
+ .usrio = &macb_default_usrio,
+};
+
static const struct of_device_id macb_dt_ids[] = {
{ .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config },
{ .compatible = "cdns,macb" },
@@ -5152,6 +5246,7 @@ static const struct of_device_id macb_dt_ids[] = {
{ .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config}, /* deprecated */
{ .compatible = "cdns,zynq-gem", .data = &zynq_config }, /* deprecated */
{ .compatible = "sifive,fu540-c000-gem", .data = &fu540_c000_config },
+ { .compatible = "mobileye,eyeq5-gem", .data = &eyeq5_config },
{ .compatible = "microchip,mpfs-macb", .data = &mpfs_config },
{ .compatible = "microchip,sama7g5-gem", .data = &sama7g5_gem_config },
{ .compatible = "microchip,sama7g5-emac", .data = &sama7g5_emac_config },

--
2.48.1