[PATCH] net: designware: add Amlogic Meson8b & later glue driver
Neil Armstrong
narmstrong at baylibre.com
Wed Feb 24 20:33:56 CET 2021
This adds a proper glue driver for the Designware DWMAC ethernet MAC IP
found in the Amlogic Meson8, GXBB, GXL, GXM, G12A, G12B & SM1 SoCs.
This is aimed to replace the static ethernet link setup found on the board
init code for the Amlogic SoC based boards.
Tested on a libretech-cc (S905x Internal RMII 10/100 PHY) and Khadas VIM3 (A113d
with external 10/100/1000 RGMII PHY) to cover the most extreme setups.
Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
---
drivers/net/Kconfig | 8 ++
drivers/net/Makefile | 1 +
drivers/net/dwmac_meson8b.c | 150 ++++++++++++++++++++++++++++++++++++
3 files changed, 159 insertions(+)
create mode 100644 drivers/net/dwmac_meson8b.c
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index e1d3b26687..cf062fad4d 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -271,6 +271,14 @@ config ETH_DESIGNWARE
100Mbit and 1 Gbit operation. You must enable CONFIG_PHYLIB to
provide the PHY (physical media interface).
+config ETH_DESIGNWARE_MESON8B
+ bool "Amlogic Meson8b and later glue driver for Synopsys Designware Ethernet MAC"
+ depends on DM_ETH
+ select ETH_DESIGNWARE
+ help
+ This provides glue layer to use Synopsys Designware Ethernet MAC
+ present on the Amlogic Meson8b, GX, AXG & G12A SoCs.
+
config ETH_DESIGNWARE_SOCFPGA
select REGMAP
select SYSCON
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 070ae7662c..ce7b9e3478 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_CORTINA_NI_ENET) += cortina_ni.o
obj-$(CONFIG_CS8900) += cs8900.o
obj-$(CONFIG_TULIP) += dc2114x.o
obj-$(CONFIG_ETH_DESIGNWARE) += designware.o
+obj-$(CONFIG_ETH_DESIGNWARE_MESON8B) += dwmac_meson8b.o
obj-$(CONFIG_ETH_DESIGNWARE_SOCFPGA) += dwmac_socfpga.o
obj-$(CONFIG_ETH_DESIGNWARE_S700) += dwmac_s700.o
obj-$(CONFIG_DRIVER_DM9000) += dm9000x.o
diff --git a/drivers/net/dwmac_meson8b.c b/drivers/net/dwmac_meson8b.c
new file mode 100644
index 0000000000..c0b6ef4994
--- /dev/null
+++ b/drivers/net/dwmac_meson8b.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2021 BayLibre, SAS
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <phy.h>
+#include "designware.h"
+#include <dm/device_compat.h>
+#include <linux/err.h>
+
+#define ETH_REG_0 0x0
+#define ETH_REG_1 0x4
+#define ETH_REG_2 0x18
+#define ETH_REG_3 0x1c
+
+#define GX_ETH_REG_0_PHY_INTF BIT(0)
+#define GX_ETH_REG_0_TX_PHASE(x) (((x) & 3) << 5)
+#define GX_ETH_REG_0_TX_RATIO(x) (((x) & 7) << 7)
+#define GX_ETH_REG_0_PHY_CLK_EN BIT(10)
+#define GX_ETH_REG_0_INVERT_RMII_CLK BIT(11)
+#define GX_ETH_REG_0_CLK_EN BIT(12)
+
+#define AXG_ETH_REG_0_PHY_INTF_RGMII BIT(0)
+#define AXG_ETH_REG_0_PHY_INTF_RMII BIT(2)
+#define AXG_ETH_REG_0_TX_PHASE(x) (((x) & 3) << 5)
+#define AXG_ETH_REG_0_TX_RATIO(x) (((x) & 7) << 7)
+#define AXG_ETH_REG_0_PHY_CLK_EN BIT(10)
+#define AXG_ETH_REG_0_INVERT_RMII_CLK BIT(11)
+#define AXG_ETH_REG_0_CLK_EN BIT(12)
+
+struct dwmac_meson8b_plat {
+ struct dw_eth_pdata dw_eth_pdata;
+ int (*dwmac_setup)(struct udevice *dev, struct eth_pdata *edata);
+ void *regs;
+};
+
+static int dwmac_meson8b_of_to_plat(struct udevice *dev)
+{
+ struct dwmac_meson8b_plat *pdata = dev_get_plat(dev);
+
+ pdata->regs = (void *)dev_read_addr_index(dev, 1);
+ if ((fdt_addr_t)pdata->regs == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ pdata->dwmac_setup = (void *)dev_get_driver_data(dev);
+ if (!pdata->dwmac_setup)
+ return -EINVAL;
+
+ return designware_eth_of_to_plat(dev);
+}
+
+static int dwmac_setup_axg(struct udevice *dev, struct eth_pdata *edata)
+{
+ struct dwmac_meson8b_plat *plat = dev_get_plat(dev);
+
+ switch (edata->phy_interface) {
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ /* Set RGMII mode */
+ setbits_le32(plat->regs + ETH_REG_0, AXG_ETH_REG_0_PHY_INTF_RGMII |
+ AXG_ETH_REG_0_TX_PHASE(1) |
+ AXG_ETH_REG_0_TX_RATIO(4) |
+ AXG_ETH_REG_0_PHY_CLK_EN |
+ AXG_ETH_REG_0_CLK_EN);
+ break;
+
+ case PHY_INTERFACE_MODE_RMII:
+ /* Set RMII mode */
+ out_le32(plat->regs + ETH_REG_0, AXG_ETH_REG_0_PHY_INTF_RMII |
+ AXG_ETH_REG_0_INVERT_RMII_CLK |
+ AXG_ETH_REG_0_CLK_EN);
+ break;
+ default:
+ dev_err(dev, "Unsupported PHY mode\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int dwmac_setup_gx(struct udevice *dev, struct eth_pdata *edata)
+{
+ struct dwmac_meson8b_plat *plat = dev_get_plat(dev);
+
+ switch (edata->phy_interface) {
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ /* Set RGMII mode */
+ setbits_le32(plat->regs + ETH_REG_0, GX_ETH_REG_0_PHY_INTF |
+ GX_ETH_REG_0_TX_PHASE(1) |
+ GX_ETH_REG_0_TX_RATIO(4) |
+ GX_ETH_REG_0_PHY_CLK_EN |
+ GX_ETH_REG_0_CLK_EN);
+
+ break;
+
+ case PHY_INTERFACE_MODE_RMII:
+ /* Set RMII mode */
+ out_le32(plat->regs + ETH_REG_0, GX_ETH_REG_0_INVERT_RMII_CLK |
+ GX_ETH_REG_0_CLK_EN);
+
+ if (!IS_ENABLED(CONFIG_MESON_GXBB))
+ writel(0x10110181, plat->regs + ETH_REG_2);
+
+ break;
+ default:
+ dev_err(dev, "Unsupported PHY mode\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int dwmac_meson8b_probe(struct udevice *dev)
+{
+ struct dwmac_meson8b_plat *pdata = dev_get_plat(dev);
+ struct eth_pdata *edata = &pdata->dw_eth_pdata.eth_pdata;
+ int ret;
+
+ ret = pdata->dwmac_setup(dev, edata);
+ if (ret)
+ return ret;
+
+ return designware_eth_probe(dev);
+}
+
+static const struct udevice_id dwmac_meson8b_ids[] = {
+ { .compatible = "amlogic,meson-gxbb-dwmac", .data = (ulong)dwmac_setup_gx },
+ { .compatible = "amlogic,meson-axg-dwmac", .data = (ulong)dwmac_setup_axg },
+ { }
+};
+
+U_BOOT_DRIVER(dwmac_meson8b) = {
+ .name = "dwmac_meson8b",
+ .id = UCLASS_ETH,
+ .of_match = dwmac_meson8b_ids,
+ .of_to_plat = dwmac_meson8b_of_to_plat,
+ .probe = dwmac_meson8b_probe,
+ .ops = &designware_eth_ops,
+ .priv_auto = sizeof(struct dw_eth_dev),
+ .plat_auto = sizeof(struct dwmac_meson8b_plat),
+ .flags = DM_FLAG_ALLOC_PRIV_DMA,
+};
--
2.25.1
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