net: stmmac: Add Adaptrum Anarion GMAC glue layer

Before the GMAC on the Anarion chip can be used, the PHY interface
selection must be configured with the DWMAC block in reset.

This layer covers a block containing only two registers. Although it
is possible to model this as a reset controller and use the "resets"
property of stmmac, it's much more intuitive to include this in the
glue layer instead.

At this time only RGMII is supported, because it is the only mode
which has been validated hardware-wise.

Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 85c0e41f80211788e81f30f88fa4c05a8dc590d1..97035766c291b0a9df2734d1f97d88ac72d5f688 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -45,6 +45,15 @@ config DWMAC_GENERIC
          platform specific code to function or is using platform
          data for setup.
 
+config DWMAC_ANARION
+       tristate "Adaptrum Anarion GMAC support"
+       default ARC
+       depends on OF && (ARC || COMPILE_TEST)
+       help
+         Support for Adaptrum Anarion GMAC Ethernet controller.
+
+         This selects the Anarion SoC glue layer support for the stmmac driver.
+
 config DWMAC_IPQ806X
        tristate "QCA IPQ806x DWMAC support"
        default ARCH_QCOM

diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index fd4937a7fcabf39cf4c2c1c55b575275803092a3..238307fadcdbc104701fa878b2fcce7c6e843421 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -7,6 +7,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o  \
 
 # Ordering matters. Generic driver must be last.
 obj-$(CONFIG_STMMAC_PLATFORM)  += stmmac-platform.o
+obj-$(CONFIG_DWMAC_ANARION)    += dwmac-anarion.o
 obj-$(CONFIG_DWMAC_IPQ806X)    += dwmac-ipq806x.o
 obj-$(CONFIG_DWMAC_LPC18XX)    += dwmac-lpc18xx.o
 obj-$(CONFIG_DWMAC_MESON)      += dwmac-meson.o dwmac-meson8b.o

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c
new file mode 100644 (file)
index 0000000..85ce80c
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c
@@ -0,0 +1,152 @@
+/*
+ * Adaptrum Anarion DWMAC glue layer
+ *
+ * Copyright (C) 2017, Adaptrum, Inc.
+ * (Written by Alexandru Gagniuc <alex.g at adaptrum.com> for Adaptrum, Inc.)
+ * Licensed under the GPLv2 or (at your option) any later version.
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_net.h>
+#include <linux/stmmac.h>
+
+#include "stmmac.h"
+#include "stmmac_platform.h"
+
+#define GMAC_RESET_CONTROL_REG         0
+#define GMAC_SW_CONFIG_REG             4
+#define  GMAC_CONFIG_INTF_SEL_MASK     (0x7 << 0)
+#define  GMAC_CONFIG_INTF_RGMII                (0x1 << 0)
+
+struct anarion_gmac {
+       uintptr_t ctl_block;
+       uint32_t phy_intf_sel;
+};
+
+static uint32_t gmac_read_reg(struct anarion_gmac *gmac, uint8_t reg)
+{
+       return readl((void *)(gmac->ctl_block + reg));
+};
+
+static void gmac_write_reg(struct anarion_gmac *gmac, uint8_t reg, uint32_t val)
+{
+       writel(val, (void *)(gmac->ctl_block + reg));
+}
+
+static int anarion_gmac_init(struct platform_device *pdev, void *priv)
+{
+       uint32_t sw_config;
+       struct anarion_gmac *gmac = priv;
+
+       /* Reset logic, configure interface mode, then release reset. SIMPLE! */
+       gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1);
+
+       sw_config = gmac_read_reg(gmac, GMAC_SW_CONFIG_REG);
+       sw_config &= ~GMAC_CONFIG_INTF_SEL_MASK;
+       sw_config |= (gmac->phy_intf_sel & GMAC_CONFIG_INTF_SEL_MASK);
+       gmac_write_reg(gmac, GMAC_SW_CONFIG_REG, sw_config);
+
+       gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 0);
+
+       return 0;
+}
+
+static void anarion_gmac_exit(struct platform_device *pdev, void *priv)
+{
+       struct anarion_gmac *gmac = priv;
+
+       gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1);
+}
+
+static struct anarion_gmac *anarion_config_dt(struct platform_device *pdev)
+{
+       int phy_mode;
+       struct resource *res;
+       void __iomem *ctl_block;
+       struct anarion_gmac *gmac;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+       ctl_block = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(ctl_block)) {
+               dev_err(&pdev->dev, "Cannot get reset region (%ld)!\n",
+                       PTR_ERR(ctl_block));
+               return ctl_block;
+       }
+
+       gmac = devm_kzalloc(&pdev->dev, sizeof(*gmac), GFP_KERNEL);
+       if (!gmac)
+               return ERR_PTR(-ENOMEM);
+
+       gmac->ctl_block = (uintptr_t)ctl_block;
+
+       phy_mode = of_get_phy_mode(pdev->dev.of_node);
+       switch (phy_mode) {
+       case PHY_INTERFACE_MODE_RGMII:          /* Fall through */
+       case PHY_INTERFACE_MODE_RGMII_ID        /* Fall through */:
+       case PHY_INTERFACE_MODE_RGMII_RXID:     /* Fall through */
+       case PHY_INTERFACE_MODE_RGMII_TXID:
+               gmac->phy_intf_sel = GMAC_CONFIG_INTF_RGMII;
+               break;
+       default:
+               dev_err(&pdev->dev, "Unsupported phy-mode (%d)\n",
+                       phy_mode);
+               return ERR_PTR(-ENOTSUPP);
+       }
+
+       return gmac;
+}
+
+static int anarion_dwmac_probe(struct platform_device *pdev)
+{
+       int ret;
+       struct anarion_gmac *gmac;
+       struct plat_stmmacenet_data *plat_dat;
+       struct stmmac_resources stmmac_res;
+
+       ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+       if (ret)
+               return ret;
+
+       gmac = anarion_config_dt(pdev);
+       if (IS_ERR(gmac))
+               return PTR_ERR(gmac);
+
+       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       if (IS_ERR(plat_dat))
+               return PTR_ERR(plat_dat);
+
+       plat_dat->init = anarion_gmac_init;
+       plat_dat->exit = anarion_gmac_exit;
+       anarion_gmac_init(pdev, gmac);
+       plat_dat->bsp_priv = gmac;
+
+       ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+       if (ret) {
+               stmmac_remove_config_dt(pdev, plat_dat);
+               return ret;
+       }
+
+       return 0;
+}
+
+static const struct of_device_id anarion_dwmac_match[] = {
+       { .compatible = "adaptrum,anarion-gmac" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, anarion_dwmac_match);
+
+static struct platform_driver anarion_dwmac_driver = {
+       .probe  = anarion_dwmac_probe,
+       .remove = stmmac_pltfr_remove,
+       .driver = {
+               .name           = "anarion-dwmac",
+               .pm             = &stmmac_pltfr_pm_ops,
+               .of_match_table = anarion_dwmac_match,
+       },
+};
+module_platform_driver(anarion_dwmac_driver);
+
+MODULE_DESCRIPTION("Adaptrum Anarion DWMAC specific glue layer");
+MODULE_AUTHOR("Alexandru Gagniuc <mr.nuke.me@gmail.com>");
+MODULE_LICENSE("GPL v2");