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Subject[PATCH RFC 08/10] net: stmmac:sti: Add STi SOC glue driver.
Date
From: Srinivas Kandagatla <srinivas.kandagatla@st.com>

STi series SOCs have a glue layer on top of the synopsis gmac IP, this
glue layer needs to be configured before the gmac driver starts using
the IP.

This patch adds a platform driver for the glue layer which configures
the IP before stmmac driver takes over.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
---
.../devicetree/bindings/net/sti-dwmac.txt | 45 +++
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c | 294 ++++++++++++++++++++
3 files changed, 340 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/net/sti-dwmac.txt
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c

diff --git a/Documentation/devicetree/bindings/net/sti-dwmac.txt b/Documentation/devicetree/bindings/net/sti-dwmac.txt
new file mode 100644
index 0000000..5431d9d
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/sti-dwmac.txt
@@ -0,0 +1,45 @@
+STMicroelectronics SoC DWMAC controller
+
+The device node has following properties.
+
+Required properties:
+ - compatible : Can be "st,stih415-dwmac", "st,stih416-dwmac" or
+ "st,stid127-dwmac".
+ - reg : Offset of the glue configuration register map in system
+ configuration regmap pointed by st,syscon property and size.
+ - st,syscon : Should be phandle to system configuration node which
+ encompases this glue registers.
+ - st,tx-retime-src: This specifies which clk is wired up to the mac for
+ retimeing tx lines. This is totally board dependent and can take one of the
+ posssible values from "txclk", "clk_125", "phyclk" or "clkgen".
+
+Optional properties:
+ - resets : phandle pointing to the system reset controller with correct
+ reset line index for ethernet reset.
+
+Sub-nodes:
+The dwmac core should be added as subnode to STMicroelectronics dwmac glue.
+- dwmac : The binding details of dwmac can be found in
+ Documentation/devicetree/bindings/net/stmmac.txt
+
+Example:
+
+ethernet0: ethernet0{
+ #address-cells = <1>;
+ #size-cells = <1>;
+ compatible = "st,stih415-dwmac";
+ reg = <0x148 0x4>;
+ resets = <&softreset STIH415_ETH0_SOFTRESET>;
+ st,syscon = <&syscfg_rear>;
+ st,tx-retime-src = "clk_125";
+ ranges;
+
+ dwmac0:dwmac@fe810000 {
+ device_type = "network";
+ compatible = "snps,dwmac", "snps,dwmac-3.610";
+ reg = <0xfe810000 0x8000>;
+ interrupts = <0 147 0>;
+ interrupt-names = "macirq";
+ ...
+ };
+};
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 356a9dd..32db223 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -1,6 +1,7 @@
obj-$(CONFIG_STMMAC_ETH) += stmmac.o
stmmac-$(CONFIG_STMMAC_PLATFORM) += stmmac_platform.o
stmmac-$(CONFIG_STMMAC_PCI) += stmmac_pci.o
+stmmac-$(CONFIG_ARCH_STI) += dwmac-sti.o
stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o \
chain_mode.o dwmac_lib.o dwmac1000_core.o dwmac1000_dma.o \
dwmac100_core.o dwmac100_dma.o enh_desc.o norm_desc.o \
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c
new file mode 100644
index 0000000..34cfa96
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c
@@ -0,0 +1,294 @@
+/**
+ * dwmac-sti.c - STMicroelectronics DWMAC Specific Glue layer
+ *
+ * Copyright (C) 2003-2013 STMicroelectronics (R&D) Limited
+ * Author: Srinivas Kandagatla <srinivas.kandagatla@st.com>
+ *
+ * Inspired by drivers/usb/dwc3/dwc3-exynos.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/phy.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_net.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+
+#define BITS_MASK(lsb, msb) ((BIT(msb - lsb + 1) - 1) << lsb)
+
+#define TX_RETIME_SRC_MASK BITS_MASK(6, 8)
+#define ETH_SEL_TX_RETIME_CLK BIT(8)
+#define ETH_SEL_INTERNAL_NOTEXT_PHYCLK BIT(7)
+#define ETH_SEL_TXCLK_NOT_CLK125 BIT(6)
+
+#define ENMII_MASK BITS_MASK(5, 5)
+#define ENMII BIT(5)
+
+/**
+ * 3 bits [4:2]
+ * 000-GMII/MII
+ * 001-RGMII
+ * 010-SGMII
+ * 100-RMII
+*/
+#define MII_PHY_SEL_MASK BITS_MASK(2, 4)
+#define ETH_PHY_SEL_RMII BIT(4)
+#define ETH_PHY_SEL_SGMII BIT(3)
+#define ETH_PHY_SEL_RGMII BIT(2)
+#define ETH_PHY_SEL_GMII 0x0
+#define ETH_PHY_SEL_MII 0x0
+
+struct sti_dwmac {
+ int interface;
+ int tx_retime_src;
+ int reg;
+ struct device *dev;
+ struct regmap *regmap;
+ struct device_node *dwmac_np;
+ struct reset_control *rstc;
+};
+
+static u32 phy_intf_sels[] = {
+ [PHY_INTERFACE_MODE_MII] = ETH_PHY_SEL_MII,
+ [PHY_INTERFACE_MODE_GMII] = ETH_PHY_SEL_GMII,
+ [PHY_INTERFACE_MODE_RGMII] = ETH_PHY_SEL_RGMII,
+ [PHY_INTERFACE_MODE_RGMII_ID] = ETH_PHY_SEL_RGMII,
+ [PHY_INTERFACE_MODE_SGMII] = ETH_PHY_SEL_SGMII,
+ [PHY_INTERFACE_MODE_RMII] = ETH_PHY_SEL_RMII,
+};
+
+enum {
+ TX_RETIME_SRC_NA,
+ TX_RETIME_SRC_TXCLK,
+ TX_RETIME_SRC_MII_CLK_125,
+ TX_RETIME_SRC_PHYCLK,
+ TX_RETIME_SRC_CLKGEN,
+};
+
+static const char * const tx_retime_srcs[] = {
+ [TX_RETIME_SRC_NA] = "",
+ [TX_RETIME_SRC_TXCLK] = "txclk",
+ [TX_RETIME_SRC_MII_CLK_125] = "clk_125",
+ [TX_RETIME_SRC_PHYCLK] = "phyclk",
+ [TX_RETIME_SRC_CLKGEN] = "clkgen",
+};
+
+/**
+ * TX lines are always retimed with a clk, which can vary depending
+ * on the board configuration. Below is the table of these bits
+ * in eth configuration register depending on source of retime clk.
+ *
+ *---------------------------------------------------------------
+ * src | tx_rt_clk | int_not_ext_phyclk | txclk_n_clk125|
+ *---------------------------------------------------------------
+ * txclk | 0 | n/a | 1 |
+ *---------------------------------------------------------------
+ * ck_125| 0 | n/a | 0 |
+ *---------------------------------------------------------------
+ * phyclk| 1 | 0 | n/a |
+ *---------------------------------------------------------------
+ * clkgen| 1 | 1 | n/a |
+ *---------------------------------------------------------------
+ */
+
+static u32 tx_retime_val[] = {
+ [TX_RETIME_SRC_TXCLK] = ETH_SEL_TXCLK_NOT_CLK125,
+ [TX_RETIME_SRC_MII_CLK_125] = 0x0,
+ [TX_RETIME_SRC_PHYCLK] = ETH_SEL_TX_RETIME_CLK,
+ [TX_RETIME_SRC_CLKGEN] = ETH_SEL_TX_RETIME_CLK |
+ ETH_SEL_INTERNAL_NOTEXT_PHYCLK,
+};
+
+static int sti_get_tx_retime_src(struct device_node *np)
+{
+ const char *rs;
+ int err, i;
+
+ err = of_property_read_string(np, "st,tx-retime-src", &rs);
+ if (err < 0)
+ return err;
+
+ for (i = 0; i < ARRAY_SIZE(tx_retime_srcs); i++)
+ if (!strcasecmp(rs, tx_retime_srcs[i]))
+ return i;
+
+ return -EINVAL;
+}
+
+static int sti_dwmac_parse_data(struct sti_dwmac *dwmac, struct device *dev)
+{
+ struct resource res;
+ struct device_node *np = dev->of_node;
+ struct device_node *stmmac_np;
+ struct regmap *regmap;
+ int tx_retime_src;
+
+ stmmac_np = of_get_next_available_child(np, NULL);
+ if (!stmmac_np) {
+ dev_info(dev, "No dwmac node found\n");
+ return -EINVAL;
+ }
+
+ if (!of_device_is_compatible(stmmac_np, "snps,dwmac")) {
+ dev_info(dev, "dwmac node isn't compatible with snps,dwmac\n");
+ return -EINVAL;
+ }
+
+ dwmac->interface = of_get_phy_mode(stmmac_np);
+ of_node_put(stmmac_np);
+
+ if (of_address_to_resource(np, 0, &res))
+ return -EINVAL;
+
+ regmap = syscon_regmap_lookup_by_phandle(np, "st,syscon");
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ tx_retime_src = sti_get_tx_retime_src(np);
+ if (tx_retime_src <= 0)
+ return tx_retime_src;
+
+ dwmac->tx_retime_src = tx_retime_src;
+ dwmac->regmap = regmap;
+ dwmac->dwmac_np = stmmac_np;
+ dwmac->reg = res.start;
+ dwmac->dev = dev;
+ dwmac->rstc = reset_control_get(dev, NULL);
+
+ if (IS_ERR(dwmac->rstc))
+ dwmac->rstc = NULL;
+
+ return 0;
+}
+
+static int sti_dwmac_setup(struct sti_dwmac *dwmac)
+{
+ struct regmap *regmap = dwmac->regmap;
+ int tx_retime_src = dwmac->tx_retime_src;
+ int iface = dwmac->interface;
+ int reg = dwmac->reg;
+ u32 val;
+
+ regmap_update_bits(regmap, reg, MII_PHY_SEL_MASK,
+ phy_intf_sels[iface]);
+
+ val = (iface == PHY_INTERFACE_MODE_REVMII) ? 0 : ENMII;
+ regmap_update_bits(regmap, reg, ENMII_MASK, val);
+
+ regmap_update_bits(regmap, reg, TX_RETIME_SRC_MASK,
+ tx_retime_val[tx_retime_src]);
+
+ /* Enable the IP */
+ if (dwmac->rstc)
+ reset_control_deassert(dwmac->rstc);
+
+ return 0;
+}
+
+static int sti_dwmac_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->of_node;
+ int ret = -ENOMEM;
+ struct sti_dwmac *dwmac;
+
+ dwmac = devm_kzalloc(dev, sizeof(*dwmac), GFP_KERNEL);
+
+ if (!dwmac)
+ return -ENOMEM;
+
+ ret = sti_dwmac_parse_data(dwmac, dev);
+ if (ret) {
+ dev_err(dev, "Unable to parse OF data\n");
+ return ret;
+ }
+
+ ret = sti_dwmac_setup(dwmac);
+ if (ret) {
+ dev_err(dev, "couldn't setup SoC glue (%d)\n", ret);
+ return ret;
+ }
+
+ if (node) {
+ ret = of_platform_populate(node, NULL, NULL, dev);
+ if (ret) {
+ dev_err(dev, "failed to add dwmac core\n");
+ return ret;
+ }
+ } else {
+ dev_err(dev, "no device node, failed to add dwmac core\n");
+ return -ENODEV;
+ }
+
+ platform_set_drvdata(pdev, dwmac);
+
+ return 0;
+}
+
+static int sti_dwmac_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int sti_dwmac_suspend(struct device *dev)
+{
+ struct sti_dwmac *dwmac = dev_get_drvdata(dev);
+
+ if (!device_child_may_wakeup(dev))
+ reset_control_assert(dwmac->rstc);
+
+ return 0;
+}
+
+static int sti_dwmac_resume(struct device *dev)
+{
+ struct sti_dwmac *dwmac = dev_get_drvdata(dev);
+
+ if (!device_child_may_wakeup(dev))
+ sti_dwmac_setup(dwmac);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(sti_dwmac_pm_ops, sti_dwmac_suspend, sti_dwmac_resume);
+#endif
+
+static const struct of_device_id sti_dwmac_match[] = {
+ { .compatible = "st,stih415-dwmac" },
+ { .compatible = "st,stih416-dwmac" },
+ { .compatible = "st,stid127-dwmac" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sti_dwmac_match);
+
+static struct platform_driver sti_dwmac_driver = {
+ .probe = sti_dwmac_probe,
+ .remove = sti_dwmac_remove,
+ .driver = {
+ .name = "sti-dwmac",
+ .of_match_table = of_match_ptr(sti_dwmac_match),
+#ifdef CONFIG_PM
+ .pm = &sti_dwmac_pm_ops,
+#endif
+ },
+};
+
+module_platform_driver(sti_dwmac_driver);
+
+MODULE_ALIAS("platform:sti-dwmac");
+MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@st.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("STMicroelectronics DWMAC Glue Layer");
--
1.7.6.5


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