stmmac: add the experimental PCI support

This patch adds the PCI support (as EXPERIMENTAL)
this has been also tested on XLINX XC2V3000 FF1152AMT0221
D1215994A VIRTEX FPGA board.
To support the PCI bus the main part has been reworked
and both the platform and the PCI specific parts have
been moved into different files.
Signed-off-by: Rayagond Kokatanur <rayagond@vayavyalabs.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/Kconfig

@@ -12,11 +12,36 @@ config STMMAC_ETH
 
 if STMMAC_ETH
 
+config STMMAC_PLATFORM
+	tristate "STMMAC platform bus support"
+	depends on STMMAC_ETH
+	default y
+	---help---
+	  This selects the platform specific bus support for
+	  the stmmac device driver. This is the driver used
+	  on many embedded STM platforms based on ARM and SuperH
+	  processors.
+	  If you have a controller with this interface, say Y or M here.
+
+	  If unsure, say N.
+
+config STMMAC_PCI
+	tristate "STMMAC support on PCI bus (EXPERIMENTAL)"
+	depends on STMMAC_ETH && PCI && EXPERIMENTAL
+	---help---
+	  This is to select the Synopsys DWMAC available on PCI devices,
+	  if you have a controller with this interface, say Y or M here.
+
+	  This PCI support is tested on XLINX XC2V3000 FF1152AMT0221
+	  D1215994A VIRTEX FPGA board.
+
+	  If unsure, say N.
+
 config STMMAC_DEBUG_FS
 	bool "Enable monitoring via sysFS "
 	default n
 	depends on STMMAC_ETH && DEBUG_FS
-	-- help
+	---help---
 	  The stmmac entry in /sys reports DMA TX/RX rings
 	  or (if supported) the HW cap register.
 

drivers/net/ethernet/stmicro/stmmac/Makefile

@@ -2,6 +2,8 @@ obj-$(CONFIG_STMMAC_ETH) += stmmac.o
 stmmac-$(CONFIG_STMMAC_TIMER) += stmmac_timer.o
 stmmac-$(CONFIG_STMMAC_RING) += ring_mode.o
 stmmac-$(CONFIG_STMMAC_CHAINED) += chain_mode.o
+stmmac-$(CONFIG_STMMAC_PLATFORM) += stmmac_platform.o
+stmmac-$(CONFIG_STMMAC_PCI) += stmmac_pci.o
 stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o	\
 	      dwmac_lib.o dwmac1000_core.o  dwmac1000_dma.o	\
 	      dwmac100_core.o dwmac100_dma.o enh_desc.o  norm_desc.o \

drivers/net/ethernet/stmicro/stmmac/common.h

@@ -22,7 +22,11 @@
   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
 *******************************************************************************/
 
+#include <linux/etherdevice.h>
 #include <linux/netdevice.h>
+#include <linux/phy.h>
+#include <linux/module.h>
+#include <linux/init.h>
 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
 #define STMMAC_VLAN_TAG_USED
 #include <linux/if_vlan.h>
@@ -315,5 +319,8 @@ extern void stmmac_set_mac_addr(void __iomem *ioaddr, u8 addr[6],
 				unsigned int high, unsigned int low);
 extern void stmmac_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
 				unsigned int high, unsigned int low);
+
+extern void stmmac_set_mac(void __iomem *ioaddr, bool enable);
+
 extern void dwmac_dma_flush_tx_fifo(void __iomem *ioaddr);
 extern const struct stmmac_ring_mode_ops ring_mode_ops;

drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c

@@ -238,6 +238,19 @@ void stmmac_set_mac_addr(void __iomem *ioaddr, u8 addr[6],
 	writel(data, ioaddr + low);
 }
 
+/* Enable disable MAC RX/TX */
+void stmmac_set_mac(void __iomem *ioaddr, bool enable)
+{
+	u32 value = readl(ioaddr + MAC_CTRL_REG);
+
+	if (enable)
+		value |= MAC_RNABLE_RX | MAC_ENABLE_TX;
+	else
+		value &= ~(MAC_ENABLE_TX | MAC_RNABLE_RX);
+
+	writel(value, ioaddr + MAC_CTRL_REG);
+}
+
 void stmmac_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
 			 unsigned int high, unsigned int low)
 {

drivers/net/ethernet/stmicro/stmmac/stmmac.h

@@ -20,7 +20,8 @@
   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
 *******************************************************************************/
 
-#define DRV_MODULE_VERSION	"Oct_2011"
+#define STMMAC_RESOURCE_NAME   "stmmaceth"
+#define DRV_MODULE_VERSION	"Dec_2011"
 #include <linux/stmmac.h>
 #include <linux/phy.h>
 #include "common.h"
@@ -82,8 +83,18 @@ struct stmmac_priv {
 	int hw_cap_support;
 };
 
+extern int phyaddr;
+
 extern int stmmac_mdio_unregister(struct net_device *ndev);
 extern int stmmac_mdio_register(struct net_device *ndev);
 extern void stmmac_set_ethtool_ops(struct net_device *netdev);
 extern const struct stmmac_desc_ops enh_desc_ops;
 extern const struct stmmac_desc_ops ndesc_ops;
+
+int stmmac_freeze(struct net_device *ndev);
+int stmmac_restore(struct net_device *ndev);
+int stmmac_resume(struct net_device *ndev);
+int stmmac_suspend(struct net_device *ndev);
+int stmmac_dvr_remove(struct net_device *ndev);
+struct stmmac_priv *stmmac_dvr_probe(struct device *device,
+				struct plat_stmmacenet_data *plat_dat);

drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c

@@ -109,6 +109,7 @@ static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg,
  */
 static int stmmac_mdio_reset(struct mii_bus *bus)
 {
+#if defined(CONFIG_STMMAC_PLATFORM)
 	struct net_device *ndev = bus->priv;
 	struct stmmac_priv *priv = netdev_priv(ndev);
 	unsigned int mii_address = priv->hw->mii.addr;
@@ -123,7 +124,7 @@ static int stmmac_mdio_reset(struct mii_bus *bus)
 	 * on MDC, so perform a dummy mdio read.
 	 */
 	writel(0, priv->ioaddr + mii_address);
-
+#endif
 	return 0;
 }
 

drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c

+/*******************************************************************************
+  This contains the functions to handle the pci driver.
+
+  Copyright (C) 2011-2012  Vayavya Labs Pvt Ltd
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Author: Rayagond Kokatanur <rayagond@vayavyalabs.com>
+  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
+*******************************************************************************/
+
+#include <linux/pci.h>
+#include "stmmac.h"
+
+struct plat_stmmacenet_data plat_dat;
+struct stmmac_mdio_bus_data mdio_data;
+
+static void stmmac_default_data(void)
+{
+	memset(&plat_dat, 0, sizeof(struct plat_stmmacenet_data));
+	plat_dat.bus_id = 1;
+	plat_dat.phy_addr = 0;
+	plat_dat.interface = PHY_INTERFACE_MODE_GMII;
+	plat_dat.pbl = 32;
+	plat_dat.clk_csr = 2;	/* clk_csr_i = 20-35MHz & MDC = clk_csr_i/16 */
+	plat_dat.has_gmac = 1;
+	plat_dat.force_sf_dma_mode = 1;
+
+	mdio_data.bus_id = 1;
+	mdio_data.phy_reset = NULL;
+	mdio_data.phy_mask = 0;
+	plat_dat.mdio_bus_data = &mdio_data;
+}
+
+/**
+ * stmmac_pci_probe
+ *
+ * @pdev: pci device pointer
+ * @id: pointer to table of device id/id's.
+ *
+ * Description: This probing function gets called for all PCI devices which
+ * match the ID table and are not "owned" by other driver yet. This function
+ * gets passed a "struct pci_dev *" for each device whose entry in the ID table
+ * matches the device. The probe functions returns zero when the driver choose
+ * to take "ownership" of the device or an error code(-ve no) otherwise.
+ */
+static int __devinit stmmac_pci_probe(struct pci_dev *pdev,
+				      const struct pci_device_id *id)
+{
+	int ret = 0;
+	void __iomem *addr = NULL;
+	struct stmmac_priv *priv = NULL;
+	int i;
+
+	/* Enable pci device */
+	ret = pci_enable_device(pdev);
+	if (ret) {
+		pr_err("%s : ERROR: failed to enable %s device\n", __func__,
+		       pci_name(pdev));
+		return ret;
+	}
+	if (pci_request_regions(pdev, STMMAC_RESOURCE_NAME)) {
+		pr_err("%s: ERROR: failed to get PCI region\n", __func__);
+		ret = -ENODEV;
+		goto err_out_req_reg_failed;
+	}
+
+	/* Get the base address of device */
+	for (i = 0; i <= 5; i++) {
+		if (pci_resource_len(pdev, i) == 0)
+			continue;
+		addr = pci_iomap(pdev, i, 0);
+		if (addr == NULL) {
+			pr_err("%s: ERROR: cannot map regiser memory, aborting",
+			       __func__);
+			ret = -EIO;
+			goto err_out_map_failed;
+		}
+		break;
+	}
+	pci_set_master(pdev);
+
+	stmmac_default_data();
+
+	priv = stmmac_dvr_probe(&(pdev->dev), &plat_dat);
+	if (!priv) {
+		pr_err("%s: main drivr probe failed", __func__);
+		goto err_out;
+	}
+	priv->ioaddr = addr;
+	priv->dev->base_addr = (unsigned long)addr;
+	priv->dev->irq = pdev->irq;
+	priv->wol_irq = pdev->irq;
+
+	pci_set_drvdata(pdev, priv->dev);
+
+	pr_debug("STMMAC platform driver registration completed");
+
+	return 0;
+
+err_out:
+	pci_clear_master(pdev);
+err_out_map_failed:
+	pci_release_regions(pdev);
+err_out_req_reg_failed:
+	pci_disable_device(pdev);
+
+	return ret;
+}
+
+/**
+ * stmmac_dvr_remove
+ *
+ * @pdev: platform device pointer
+ * Description: this function calls the main to free the net resources
+ * and releases the PCI resources.
+ */
+static void __devexit stmmac_pci_remove(struct pci_dev *pdev)
+{
+	struct net_device *ndev = pci_get_drvdata(pdev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+
+	stmmac_dvr_remove(ndev);
+
+	pci_set_drvdata(pdev, NULL);
+	pci_iounmap(pdev, priv->ioaddr);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+}
+
+#ifdef CONFIG_PM
+static int stmmac_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	struct net_device *ndev = pci_get_drvdata(pdev);
+	int ret;
+
+	ret = stmmac_suspend(ndev);
+	pci_save_state(pdev);
+	pci_set_power_state(pdev, pci_choose_state(pdev, state));
+
+	return ret;
+}
+
+static int stmmac_pci_resume(struct pci_dev *pdev)
+{
+	struct net_device *ndev = pci_get_drvdata(pdev);
+
+	pci_set_power_state(pdev, PCI_D0);
+	pci_restore_state(pdev);
+
+	return stmmac_resume(ndev);
+}
+#endif
+
+#define STMMAC_VENDOR_ID 0x700
+#define STMMAC_DEVICE_ID 0x1108
+
+static DEFINE_PCI_DEVICE_TABLE(stmmac_id_table) = {
+	{
+	PCI_DEVICE(STMMAC_VENDOR_ID, STMMAC_DEVICE_ID)}, {
+	}
+};
+
+MODULE_DEVICE_TABLE(pci, stmmac_id_table);
+
+static struct pci_driver stmmac_driver = {
+	.name = STMMAC_RESOURCE_NAME,
+	.id_table = stmmac_id_table,
+	.probe = stmmac_pci_probe,
+	.remove = __devexit_p(stmmac_pci_remove),
+#ifdef CONFIG_PM
+	.suspend = stmmac_pci_suspend,
+	.resume = stmmac_pci_resume,
+#endif
+};
+
+/**
+ * stmmac_init_module - Entry point for the driver
+ * Description: This function is the entry point for the driver.
+ */
+static int __init stmmac_init_module(void)
+{
+	int ret;
+
+	ret = pci_register_driver(&stmmac_driver);
+	if (ret < 0)
+		pr_err("%s: ERROR: driver registration failed\n", __func__);
+
+	return ret;
+}
+
+/**
+ * stmmac_cleanup_module - Cleanup routine for the driver
+ * Description: This function is the cleanup routine for the driver.
+ */
+static void __exit stmmac_cleanup_module(void)
+{
+	pci_unregister_driver(&stmmac_driver);
+}
+
+module_init(stmmac_init_module);
+module_exit(stmmac_cleanup_module);
+
+MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet PCI driver");
+MODULE_AUTHOR("Rayagond Kokatanur <rayagond.kokatanur@vayavyalabs.com>");
+MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
+MODULE_LICENSE("GPL");

drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

+/*******************************************************************************
+  This contains the functions to handle the platform driver.
+
+  Copyright (C) 2007-2011  STMicroelectronics Ltd
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
+*******************************************************************************/
+
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include "stmmac.h"
+
+/**
+ * stmmac_pltfr_probe
+ * @pdev: platform device pointer
+ * Description: platform_device probe function. It allocates
+ * the necessary resources and invokes the main to init
+ * the net device, register the mdio bus etc.
+ */
+static int stmmac_pltfr_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct resource *res;
+	void __iomem *addr = NULL;
+	struct stmmac_priv *priv = NULL;
+	struct plat_stmmacenet_data *plat_dat;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+
+	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
+		pr_err("%s: ERROR: memory allocation failed"
+		       "cannot get the I/O addr 0x%x\n",
+		       __func__, (unsigned int)res->start);
+		return -EBUSY;
+	}
+
+	addr = ioremap(res->start, resource_size(res));
+	if (!addr) {
+		pr_err("%s: ERROR: memory mapping failed", __func__);
+		ret = -ENOMEM;
+		goto out_release_region;
+	}
+	plat_dat = pdev->dev.platform_data;
+	priv = stmmac_dvr_probe(&(pdev->dev), plat_dat);
+	if (!priv) {
+		pr_err("%s: main drivr probe failed", __func__);
+		goto out_release_region;
+	}
+
+	priv->ioaddr = addr;
+	/* Set the I/O base addr */
+	priv->dev->base_addr = (unsigned long)addr;
+
+	/* Get the MAC information */
+	priv->dev->irq = platform_get_irq_byname(pdev, "macirq");
+	if (priv->dev->irq == -ENXIO) {
+		pr_err("%s: ERROR: MAC IRQ configuration "
+		       "information not found\n", __func__);
+		ret = -ENXIO;
+		goto out_unmap;
+	}
+
+	/*
+	 * On some platforms e.g. SPEAr the wake up irq differs from the mac irq
+	 * The external wake up irq can be passed through the platform code
+	 * named as "eth_wake_irq"
+	 *
+	 * In case the wake up interrupt is not passed from the platform
+	 * so the driver will continue to use the mac irq (ndev->irq)
+	 */
+	priv->wol_irq = platform_get_irq_byname(pdev, "eth_wake_irq");
+	if (priv->wol_irq == -ENXIO)
+		priv->wol_irq = priv->dev->irq;
+
+	platform_set_drvdata(pdev, priv->dev);
+
+	/* Custom initialisation */
+	if (priv->plat->init) {
+		ret = priv->plat->init(pdev);
+		if (unlikely(ret))
+			goto out_unmap;
+	}
+
+	pr_debug("STMMAC platform driver registration completed");
+
+	return 0;
+
+out_unmap:
+	iounmap(addr);
+	platform_set_drvdata(pdev, NULL);
+
+out_release_region:
+	release_mem_region(res->start, resource_size(res));
+
+	return ret;
+}
+
+/**
+ * stmmac_pltfr_remove
+ * @pdev: platform device pointer
+ * Description: this function calls the main to free the net resources
+ * and calls the platforms hook and release the resources (e.g. mem).
+ */
+static int stmmac_pltfr_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+	struct resource *res;
+	int ret = stmmac_dvr_remove(ndev);
+
+	if (priv->plat->exit)
+		priv->plat->exit(pdev);
+
+	if (priv->plat->exit)
+		priv->plat->exit(pdev);
+
+	platform_set_drvdata(pdev, NULL);
+
+	iounmap((void *)priv->ioaddr);
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(res->start, resource_size(res));
+
+	return ret;
+}
+
+#ifdef CONFIG_PM
+static int stmmac_pltfr_suspend(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+
+	return stmmac_suspend(ndev);
+}
+
+static int stmmac_pltfr_resume(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+
+	return stmmac_resume(ndev);
+}
+
+int stmmac_pltfr_freeze(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+
+	return stmmac_freeze(ndev);
+}
+
+int stmmac_pltfr_restore(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+
+	return stmmac_restore(ndev);
+}
+
+static const struct dev_pm_ops stmmac_pltfr_pm_ops = {
+	.suspend = stmmac_pltfr_suspend,
+	.resume = stmmac_pltfr_resume,
+	.freeze = stmmac_pltfr_freeze,
+	.thaw = stmmac_pltfr_restore,
+	.restore = stmmac_pltfr_restore,
+};
+#else
+static const struct dev_pm_ops stmmac_pltfr_pm_ops;
+#endif /* CONFIG_PM */
+
+static struct platform_driver stmmac_driver = {
+	.probe = stmmac_pltfr_probe,
+	.remove = stmmac_pltfr_remove,
+	.driver = {
+		   .name = STMMAC_RESOURCE_NAME,
+		   .owner = THIS_MODULE,
+		   .pm = &stmmac_pltfr_pm_ops,
+		   },
+};
+
+module_platform_driver(stmmac_driver);
+
+MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet PLATFORM driver");
+MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
+MODULE_LICENSE("GPL");