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Message-Id: <1454511275-9791-2-git-send-email-alexandre.torgue@gmail.com>
Date: Wed, 3 Feb 2016 15:54:32 +0100
From: Alexandre TORGUE <alexandre.torgue@...il.com>
To: Maxime Coquelin <mcoquelin.stm32@...il.com>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
netdev@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] net: ethernet: dwmac: add Ethernet glue logic for stm32 chip
stm324xx family chips support Synopsys MAC 3.510 IP.
This patch adds settings for logical glue logic:
-clocks
-mode selection MII or RMII.
Signed-off-by: Alexandre TORGUE <alexandre.torgue@...il.com>
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index cec147d..a94dd15 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -114,6 +114,18 @@ config DWMAC_SUNXI
This selects Allwinner SoC glue layer support for the
stmmac device driver. This driver is used for A20/A31
GMAC ethernet controller.
+
+config DWMAC_STM32
+ tristate "STM32 DWMAC support"
+ default ARCH_STM32
+ depends on OF
+ select MFD_SYSCON
+ ---help---
+ Support for ethernet controller on STM32 SOCs.
+
+ This selects STM32 SoC glue layer support for the stmmac
+ device driver. This driver is used on for the STM32 series
+ SOCs GMAC ethernet controller.
endif
config STMMAC_PCI
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index b390161..9fb2061 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_DWMAC_SOCFPGA) += dwmac-socfpga.o
obj-$(CONFIG_DWMAC_STI) += dwmac-sti.o
obj-$(CONFIG_DWMAC_SUNXI) += dwmac-sunxi.o
obj-$(CONFIG_DWMAC_GENERIC) += dwmac-generic.o
+obj-$(CONFIG_DWMAC_STM32) += dwmac-stm32.o
stmmac-platform-objs:= stmmac_platform.o
obj-$(CONFIG_STMMAC_PCI) += stmmac-pci.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
new file mode 100644
index 0000000..56ccc20
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -0,0 +1,177 @@
+/*
+ * dwmac-stm32.c - DWMAC Specific Glue layer for STM32 MCU
+ *
+ * Copyright (C) Alexandre Torgue 2015
+ * Author: Alexandre Torgue <alexandre.torgue@...il.com>
+ * License terms: GNU General Public License (GPL), version 2
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/stmmac.h>
+#include <linux/phy.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_net.h>
+
+#include "stmmac_platform.h"
+
+#define MII_PHY_SEL_MASK BIT(23)
+
+struct stm32_dwmac {
+ int interface; /* MII interface */
+ struct clk *clk_tx;
+ struct clk *clk_rx;
+ u32 mode_reg; /* MAC glue-logic mode register */
+ struct device *dev;
+ struct regmap *regmap;
+ u32 speed;
+};
+
+static int stm32_dwmac_init(struct platform_device *pdev, void *priv)
+{
+ struct stm32_dwmac *dwmac = priv;
+ struct regmap *regmap = dwmac->regmap;
+ int ret, iface = dwmac->interface;
+ u32 reg = dwmac->mode_reg;
+ u32 val;
+
+ if (dwmac->clk_tx)
+ ret = clk_prepare_enable(dwmac->clk_tx);
+ if (ret)
+ goto out;
+
+ if (dwmac->clk_rx)
+ ret = clk_prepare_enable(dwmac->clk_rx);
+ if (ret)
+ goto out_disable_clk_tx;
+
+ val = (iface == PHY_INTERFACE_MODE_MII) ? 0 : 1;
+ ret = regmap_update_bits(regmap, reg, MII_PHY_SEL_MASK, val);
+ if (ret)
+ goto out_disable_clk_tx_rx;
+
+ return 0;
+
+out_disable_clk_tx_rx:
+ clk_disable_unprepare(dwmac->clk_rx);
+out_disable_clk_tx:
+ clk_disable_unprepare(dwmac->clk_tx);
+out:
+ return ret;
+}
+
+static void stm32_dwmac_exit(struct platform_device *pdev, void *priv)
+{
+ struct stm32_dwmac *dwmac = priv;
+
+ if (dwmac->clk_tx)
+ clk_disable_unprepare(dwmac->clk_tx);
+ if (dwmac->clk_rx)
+ clk_disable_unprepare(dwmac->clk_rx);
+}
+
+static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac,
+ struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct regmap *regmap;
+ int err;
+
+ if (!np)
+ return -EINVAL;
+
+ /* Get TX/RX clocks */
+ dwmac->clk_tx = devm_clk_get(dev, "tx-clk");
+ if (IS_ERR(dwmac->clk_tx)) {
+ dev_warn(dev, "No tx clock provided...\n");
+ dwmac->clk_tx = NULL;
+ }
+ dwmac->clk_rx = devm_clk_get(dev, "rx-clk");
+ if (IS_ERR(dwmac->clk_rx)) {
+ dev_warn(dev, "No rx clock provided...\n");
+ dwmac->clk_rx = NULL;
+ }
+
+ /* Get mode register */
+ regmap = syscon_regmap_lookup_by_phandle(np, "st,syscon");
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ err = of_property_read_u32_index(np, "st,syscon", 1, &dwmac->mode_reg);
+ if (err) {
+ dev_err(dev, "Can't get sysconfig mode offset (%d)\n", err);
+ return err;
+ }
+
+ dwmac->dev = dev;
+ dwmac->interface = of_get_phy_mode(np);
+ dwmac->regmap = regmap;
+
+ return 0;
+}
+
+static int stm32_dwmac_probe(struct platform_device *pdev)
+{
+ struct plat_stmmacenet_data *plat_dat;
+ struct stmmac_resources stmmac_res;
+ struct stm32_dwmac *dwmac;
+ int ret;
+
+ ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+ if (ret)
+ return ret;
+
+ plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+ if (IS_ERR(plat_dat))
+ return PTR_ERR(plat_dat);
+
+ dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+ if (!dwmac)
+ return -ENOMEM;
+
+ ret = stm32_dwmac_parse_data(dwmac, pdev);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to parse OF data\n");
+ return ret;
+ }
+
+ plat_dat->bsp_priv = dwmac;
+ plat_dat->init = stm32_dwmac_init;
+ plat_dat->exit = stm32_dwmac_exit;
+
+ ret = stm32_dwmac_init(pdev, plat_dat->bsp_priv);
+ if (ret)
+ return ret;
+
+ return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+}
+
+static const struct of_device_id stm32_dwmac_match[] = {
+ { .compatible = "st,stm32-dwmac"},
+ { }
+};
+MODULE_DEVICE_TABLE(of, stm32_dwmac_match);
+
+static struct platform_driver stm32_dwmac_driver = {
+ .probe = stm32_dwmac_probe,
+ .remove = stmmac_pltfr_remove,
+ .driver = {
+ .name = "stm32-dwmac",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = stm32_dwmac_match,
+ },
+};
+module_platform_driver(stm32_dwmac_driver);
+
+MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@...il.com>");
+MODULE_DESCRIPTION("STMicroelectronics MCU DWMAC Specific Glue layer");
+MODULE_LICENSE("GPL");
+
--
1.9.1
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