[PATCH] network driver for Hilscher netx

This is a patch for the Hilscher netx builtin ethernet ports. The
netx board support was merged into 2.6.17-git2.
The netx is a arm926 based SoC.

Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

--
 drivers/net/Kconfig             |   11
 drivers/net/Makefile            |    1
 drivers/net/netx-eth.c          |  516 ++++++++++++++++++++++++++++++++++++++++
 include/asm-arm/arch-netx/eth.h |   27 ++
 4 files changed, 555 insertions(+)
Signed-off-by: Jeff Garzik <jeff@garzik.org>

3 files changed, 528 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 67e8126..7fa24c5 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -854,6 +854,17 @@ config SMC9194
 	  <file:Documentation/networking/net-modules.txt>. The module
 	  will be called smc9194.
 
+config NET_NETX
+	tristate "NetX Ethernet support"
+	select MII
+	depends on NET_ETHERNET && ARCH_NETX
+	help
+	  This is support for the Hilscher netX builtin Ethernet ports
+
+	  To compile this driver as a module, choose M here and read
+	  <file:Documentation/networking/net-modules.txt>. The module
+	  will be called netx-eth.
+
 config DM9000
 	tristate "DM9000 support"
 	depends on (ARM || MIPS) && NET_ETHERNET
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 1eced32..c91e951 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -187,6 +187,7 @@ obj-$(CONFIG_MACSONIC) += macsonic.o
 obj-$(CONFIG_MACMACE) += macmace.o
 obj-$(CONFIG_MAC89x0) += mac89x0.o
 obj-$(CONFIG_TUN) += tun.o
+obj-$(CONFIG_NET_NETX) += netx-eth.o
 obj-$(CONFIG_DL2K) += dl2k.o
 obj-$(CONFIG_R8169) += r8169.o
 obj-$(CONFIG_AMD8111_ETH) += amd8111e.o
diff --git a/drivers/net/netx-eth.c b/drivers/net/netx-eth.c
new file mode 100644
index 0000000..b92430c
--- /dev/null
+++ b/drivers/net/netx-eth.c
@@ -0,0 +1,516 @@
+/*
+ * drivers/net/netx-eth.c
+ *
+ * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/mii.h>
+
+#include <asm/io.h>
+#include <asm/hardware.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/netx-regs.h>
+#include <asm/arch/pfifo.h>
+#include <asm/arch/xc.h>
+#include <asm/arch/eth.h>
+
+/* XC Fifo Offsets */
+#define EMPTY_PTR_FIFO(xcno)    (0 + ((xcno) << 3))	/* Index of the empty pointer FIFO */
+#define IND_FIFO_PORT_HI(xcno)  (1 + ((xcno) << 3))	/* Index of the FIFO where received */
+							/* Data packages are indicated by XC */
+#define IND_FIFO_PORT_LO(xcno)  (2 + ((xcno) << 3))	/* Index of the FIFO where received */
+							/* Data packages are indicated by XC */
+#define REQ_FIFO_PORT_HI(xcno)  (3 + ((xcno) << 3))	/* Index of the FIFO where Data packages */
+							/* have to be indicated by ARM which */
+							/* shall be sent */
+#define REQ_FIFO_PORT_LO(xcno)  (4 + ((xcno) << 3))	/* Index of the FIFO where Data packages */
+							/* have to be indicated by ARM which shall */
+							/* be sent */
+#define CON_FIFO_PORT_HI(xcno)  (5 + ((xcno) << 3))	/* Index of the FIFO where sent Data packages */
+							/* are confirmed */
+#define CON_FIFO_PORT_LO(xcno)  (6 + ((xcno) << 3))	/* Index of the FIFO where sent Data */
+							/* packages are confirmed */
+#define PFIFO_MASK(xcno)        (0x7f << (xcno*8))
+
+#define FIFO_PTR_FRAMELEN_SHIFT 0
+#define FIFO_PTR_FRAMELEN_MASK  (0x7ff << 0)
+#define FIFO_PTR_FRAMELEN(len)  (((len) << 0) & FIFO_PTR_FRAMELEN_MASK)
+#define FIFO_PTR_TIMETRIG       (1<<11)
+#define FIFO_PTR_MULTI_REQ
+#define FIFO_PTR_ORIGIN         (1<<14)
+#define FIFO_PTR_VLAN           (1<<15)
+#define FIFO_PTR_FRAMENO_SHIFT  16
+#define FIFO_PTR_FRAMENO_MASK   (0x3f << 16)
+#define FIFO_PTR_FRAMENO(no)    (((no) << 16) & FIFO_PTR_FRAMENO_MASK)
+#define FIFO_PTR_SEGMENT_SHIFT  22
+#define FIFO_PTR_SEGMENT_MASK   (0xf << 22)
+#define FIFO_PTR_SEGMENT(seg)   (((seg) & 0xf) << 22)
+#define FIFO_PTR_ERROR_SHIFT    28
+#define FIFO_PTR_ERROR_MASK     (0xf << 28)
+
+#define ISR_LINK_STATUS_CHANGE (1<<4)
+#define ISR_IND_LO             (1<<3)
+#define ISR_CON_LO             (1<<2)
+#define ISR_IND_HI             (1<<1)
+#define ISR_CON_HI             (1<<0)
+
+#define ETH_MAC_LOCAL_CONFIG 0x1560
+#define ETH_MAC_4321         0x1564
+#define ETH_MAC_65           0x1568
+
+#define MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT 16
+#define MAC_TRAFFIC_CLASS_ARRANGEMENT_MASK (0xf<<MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT)
+#define MAC_TRAFFIC_CLASS_ARRANGEMENT(x) (((x)<<MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT) & MAC_TRAFFIC_CLASS_ARRANGEMENT_MASK)
+#define LOCAL_CONFIG_LINK_STATUS_IRQ_EN (1<<24)
+#define LOCAL_CONFIG_CON_LO_IRQ_EN (1<<23)
+#define LOCAL_CONFIG_CON_HI_IRQ_EN (1<<22)
+#define LOCAL_CONFIG_IND_LO_IRQ_EN (1<<21)
+#define LOCAL_CONFIG_IND_HI_IRQ_EN (1<<20)
+
+#define CARDNAME "netx-eth"
+
+/* LSB must be zero */
+#define INTERNAL_PHY_ADR 0x1c
+
+struct netx_eth_priv {
+	void                    __iomem *sram_base, *xpec_base, *xmac_base;
+	int                     id;
+	struct net_device_stats stats;
+	struct mii_if_info      mii;
+	u32                     msg_enable;
+	struct xc               *xc;
+	spinlock_t              lock;
+};
+
+static void netx_eth_set_multicast_list(struct net_device *ndev)
+{
+	/* implement me */
+}
+
+static int
+netx_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+	struct netx_eth_priv *priv = netdev_priv(ndev);
+	unsigned char *buf = skb->data;
+	unsigned int len = skb->len;
+
+	spin_lock_irq(&priv->lock);
+	memcpy_toio(priv->sram_base + 1560, (void *)buf, len);
+	if (len < 60) {
+		memset_io(priv->sram_base + 1560 + len, 0, 60 - len);
+		len = 60;
+	}
+
+	pfifo_push(REQ_FIFO_PORT_LO(priv->id),
+	           FIFO_PTR_SEGMENT(priv->id) |
+	           FIFO_PTR_FRAMENO(1) |
+	           FIFO_PTR_FRAMELEN(len));
+
+	ndev->trans_start = jiffies;
+	priv->stats.tx_packets++;
+	priv->stats.tx_bytes += skb->len;
+
+	netif_stop_queue(ndev);
+	spin_unlock_irq(&priv->lock);
+	dev_kfree_skb(skb);
+
+	return 0;
+}
+
+static void netx_eth_receive(struct net_device *ndev)
+{
+	struct netx_eth_priv *priv = netdev_priv(ndev);
+	unsigned int val, frameno, seg, len;
+	unsigned char *data;
+	struct sk_buff *skb;
+
+	val = pfifo_pop(IND_FIFO_PORT_LO(priv->id));
+
+	frameno = (val & FIFO_PTR_FRAMENO_MASK) >> FIFO_PTR_FRAMENO_SHIFT;
+	seg = (val & FIFO_PTR_SEGMENT_MASK) >> FIFO_PTR_SEGMENT_SHIFT;
+	len = (val & FIFO_PTR_FRAMELEN_MASK) >> FIFO_PTR_FRAMELEN_SHIFT;
+
+	skb = dev_alloc_skb(len);
+	if (unlikely(skb == NULL)) {
+		printk(KERN_NOTICE "%s: Low memory, packet dropped.\n",
+			ndev->name);
+		priv->stats.rx_dropped++;
+		return;
+	}
+
+	data = skb_put(skb, len);
+
+	memcpy_fromio(data, priv->sram_base + frameno * 1560, len);
+
+	pfifo_push(EMPTY_PTR_FIFO(priv->id),
+		FIFO_PTR_SEGMENT(seg) | FIFO_PTR_FRAMENO(frameno));
+
+	ndev->last_rx = jiffies;
+	skb->dev = ndev;
+	skb->protocol = eth_type_trans(skb, ndev);
+	netif_rx(skb);
+	priv->stats.rx_packets++;
+	priv->stats.rx_bytes += len;
+}
+
+static irqreturn_t
+netx_eth_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *ndev = dev_id;
+	struct netx_eth_priv *priv = netdev_priv(ndev);
+	int status;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	status = readl(NETX_PFIFO_XPEC_ISR(priv->id));
+	while (status) {
+		int fill_level;
+		writel(status, NETX_PFIFO_XPEC_ISR(priv->id));
+
+		if ((status & ISR_CON_HI) || (status & ISR_IND_HI))
+			printk("%s: unexpected status: 0x%08x\n",
+			    __FUNCTION__, status);
+
+		fill_level =
+		    readl(NETX_PFIFO_FILL_LEVEL(IND_FIFO_PORT_LO(priv->id)));
+		while (fill_level--)
+			netx_eth_receive(ndev);
+
+		if (status & ISR_CON_LO)
+			netif_wake_queue(ndev);
+
+		if (status & ISR_LINK_STATUS_CHANGE)
+			mii_check_media(&priv->mii, netif_msg_link(priv), 1);
+
+		status = readl(NETX_PFIFO_XPEC_ISR(priv->id));
+	}
+	spin_unlock_irqrestore(&priv->lock, flags);
+	return IRQ_HANDLED;
+}
+
+static struct net_device_stats *netx_eth_query_statistics(struct net_device *ndev)
+{
+	struct netx_eth_priv *priv = netdev_priv(ndev);
+	return &priv->stats;
+}
+
+static int netx_eth_open(struct net_device *ndev)
+{
+	struct netx_eth_priv *priv = netdev_priv(ndev);
+
+	if (request_irq
+	    (ndev->irq, &netx_eth_interrupt, SA_SHIRQ, ndev->name, ndev))
+		return -EAGAIN;
+
+	writel(ndev->dev_addr[0] |
+	       ndev->dev_addr[1]<<8 |
+	       ndev->dev_addr[2]<<16 |
+	       ndev->dev_addr[3]<<24,
+	       priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_4321);
+	writel(ndev->dev_addr[4] |
+	       ndev->dev_addr[5]<<8,
+	       priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_65);
+
+	writel(LOCAL_CONFIG_LINK_STATUS_IRQ_EN |
+		LOCAL_CONFIG_CON_LO_IRQ_EN |
+		LOCAL_CONFIG_CON_HI_IRQ_EN |
+		LOCAL_CONFIG_IND_LO_IRQ_EN |
+		LOCAL_CONFIG_IND_HI_IRQ_EN,
+		priv->xpec_base + NETX_XPEC_RAM_START_OFS +
+		ETH_MAC_LOCAL_CONFIG);
+
+	mii_check_media(&priv->mii, netif_msg_link(priv), 1);
+	netif_start_queue(ndev);
+
+	return 0;
+}
+
+static int netx_eth_close(struct net_device *ndev)
+{
+	struct netx_eth_priv *priv = netdev_priv(ndev);
+
+	netif_stop_queue(ndev);
+
+	writel(0,
+	    priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_LOCAL_CONFIG);
+
+	free_irq(ndev->irq, ndev);
+
+	return 0;
+}
+
+static void netx_eth_timeout(struct net_device *ndev)
+{
+	struct netx_eth_priv *priv = netdev_priv(ndev);
+	int i;
+
+	printk(KERN_ERR "%s: transmit timed out, resetting\n", ndev->name);
+
+	spin_lock_irq(&priv->lock);
+
+	xc_reset(priv->xc);
+	xc_start(priv->xc);
+
+	for (i=2; i<=18; i++)
+		pfifo_push(EMPTY_PTR_FIFO(priv->id),
+			FIFO_PTR_FRAMENO(i) | FIFO_PTR_SEGMENT(priv->id));
+
+	spin_unlock_irq(&priv->lock);
+
+	netif_wake_queue(ndev);
+}
+
+static int
+netx_eth_phy_read(struct net_device *ndev, int phy_id, int reg)
+{
+	unsigned int val;
+
+	val = MIIMU_SNRDY | MIIMU_PREAMBLE | MIIMU_PHYADDR(phy_id) |
+	      MIIMU_REGADDR(reg) | MIIMU_PHY_NRES;
+
+	writel(val, NETX_MIIMU);
+	while (readl(NETX_MIIMU) & MIIMU_SNRDY);
+
+	return readl(NETX_MIIMU) >> 16;
+
+}
+
+static void
+netx_eth_phy_write(struct net_device *ndev, int phy_id, int reg, int value)
+{
+	unsigned int val;
+
+	val = MIIMU_SNRDY | MIIMU_PREAMBLE | MIIMU_PHYADDR(phy_id) |
+	      MIIMU_REGADDR(reg) | MIIMU_PHY_NRES | MIIMU_OPMODE_WRITE |
+	      MIIMU_DATA(value);
+
+	writel(val, NETX_MIIMU);
+	while (readl(NETX_MIIMU) & MIIMU_SNRDY);
+}
+
+static int netx_eth_enable(struct net_device *ndev)
+{
+	struct netx_eth_priv *priv = netdev_priv(ndev);
+	unsigned int mac4321, mac65;
+	int running, i;
+
+	ether_setup(ndev);
+
+	ndev->open = netx_eth_open;
+	ndev->stop = netx_eth_close;
+	ndev->hard_start_xmit = netx_eth_hard_start_xmit;
+	ndev->tx_timeout = netx_eth_timeout;
+	ndev->watchdog_timeo = msecs_to_jiffies(5000);
+	ndev->get_stats = netx_eth_query_statistics;
+	ndev->set_multicast_list = netx_eth_set_multicast_list;
+
+	priv->msg_enable       = NETIF_MSG_LINK;
+	priv->mii.phy_id_mask  = 0x1f;
+	priv->mii.reg_num_mask = 0x1f;
+	priv->mii.force_media  = 0;
+	priv->mii.full_duplex  = 0;
+	priv->mii.dev	     = ndev;
+	priv->mii.mdio_read    = netx_eth_phy_read;
+	priv->mii.mdio_write   = netx_eth_phy_write;
+	priv->mii.phy_id = INTERNAL_PHY_ADR + priv->id;
+
+	running = xc_running(priv->xc);
+	xc_stop(priv->xc);
+
+	/* if the xc engine is already running, assume the bootloader has
+	 * loaded the firmware for us
+	 */
+	if (running) {
+		/* get Node Address from hardware */
+		mac4321 = readl(priv->xpec_base +
+			NETX_XPEC_RAM_START_OFS + ETH_MAC_4321);
+		mac65 = readl(priv->xpec_base +
+			NETX_XPEC_RAM_START_OFS + ETH_MAC_65);
+
+		ndev->dev_addr[0] = mac4321 & 0xff;
+		ndev->dev_addr[1] = (mac4321 >> 8) & 0xff;
+		ndev->dev_addr[2] = (mac4321 >> 16) & 0xff;
+		ndev->dev_addr[3] = (mac4321 >> 24) & 0xff;
+		ndev->dev_addr[4] = mac65 & 0xff;
+		ndev->dev_addr[5] = (mac65 >> 8) & 0xff;
+	} else {
+		if (xc_request_firmware(priv->xc)) {
+			printk(CARDNAME ": requesting firmware failed\n");
+			return -ENODEV;
+		}
+	}
+
+	xc_reset(priv->xc);
+	xc_start(priv->xc);
+
+	if (!is_valid_ether_addr(ndev->dev_addr))
+		printk("%s: Invalid ethernet MAC address.  Please "
+		       "set using ifconfig\n", ndev->name);
+
+	for (i=2; i<=18; i++)
+		pfifo_push(EMPTY_PTR_FIFO(priv->id),
+			FIFO_PTR_FRAMENO(i) | FIFO_PTR_SEGMENT(priv->id));
+
+	return register_netdev(ndev);
+
+}
+
+static int netx_eth_drv_probe(struct platform_device *pdev)
+{
+	struct netx_eth_priv *priv;
+	struct net_device *ndev;
+	struct netxeth_platform_data *pdata;
+	int ret;
+
+	ndev = alloc_etherdev(sizeof (struct netx_eth_priv));
+	if (!ndev) {
+		printk("%s: could not allocate device.\n", CARDNAME);
+		ret = -ENOMEM;
+		goto exit;
+	}
+	SET_MODULE_OWNER(ndev);
+	SET_NETDEV_DEV(ndev, &pdev->dev);
+
+	platform_set_drvdata(pdev, ndev);
+
+	priv = netdev_priv(ndev);
+
+	pdata = (struct netxeth_platform_data *)pdev->dev.platform_data;
+	priv->xc = request_xc(pdata->xcno, &pdev->dev);
+	if (!priv->xc) {
+		dev_err(&pdev->dev, "unable to request xc engine\n");
+		ret = -ENODEV;
+		goto exit_free_netdev;
+	}
+
+	ndev->irq = priv->xc->irq;
+	priv->id = pdev->id;
+	priv->xpec_base = priv->xc->xpec_base;
+	priv->xmac_base = priv->xc->xmac_base;
+	priv->sram_base = priv->xc->sram_base;
+
+	ret = pfifo_request(PFIFO_MASK(priv->id));
+	if (ret) {
+		printk("unable to request PFIFO\n");
+		goto exit_free_xc;
+	}
+
+	ret = netx_eth_enable(ndev);
+	if (ret)
+		goto exit_free_pfifo;
+
+	return 0;
+exit_free_pfifo:
+	pfifo_free(PFIFO_MASK(priv->id));
+exit_free_xc:
+	free_xc(priv->xc);
+exit_free_netdev:
+	platform_set_drvdata(pdev, NULL);
+	free_netdev(ndev);
+exit:
+	return ret;
+}
+
+static int netx_eth_drv_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = dev_get_drvdata(&pdev->dev);
+	struct netx_eth_priv *priv = netdev_priv(ndev);
+
+	platform_set_drvdata(pdev, NULL);
+
+	unregister_netdev(ndev);
+	xc_stop(priv->xc);
+	free_xc(priv->xc);
+	free_netdev(ndev);
+	pfifo_free(PFIFO_MASK(priv->id));
+
+	return 0;
+}
+
+static int netx_eth_drv_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	dev_err(&pdev->dev, "suspend not implemented\n");
+	return 0;
+}
+
+static int netx_eth_drv_resume(struct platform_device *pdev)
+{
+	dev_err(&pdev->dev, "resume not implemented\n");
+	return 0;
+}
+
+static struct platform_driver netx_eth_driver = {
+	.probe		= netx_eth_drv_probe,
+	.remove		= netx_eth_drv_remove,
+	.suspend	= netx_eth_drv_suspend,
+	.resume		= netx_eth_drv_resume,
+	.driver		= {
+		.name	= CARDNAME,
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init netx_eth_init(void)
+{
+	unsigned int phy_control, val;
+
+	printk("NetX Ethernet driver\n");
+
+	phy_control = PHY_CONTROL_PHY_ADDRESS(INTERNAL_PHY_ADR>>1) |
+		      PHY_CONTROL_PHY1_MODE(PHY_MODE_ALL) |
+		      PHY_CONTROL_PHY1_AUTOMDIX |
+		      PHY_CONTROL_PHY1_EN |
+		      PHY_CONTROL_PHY0_MODE(PHY_MODE_ALL) |
+		      PHY_CONTROL_PHY0_AUTOMDIX |
+		      PHY_CONTROL_PHY0_EN |
+		      PHY_CONTROL_CLK_XLATIN;
+
+	val = readl(NETX_SYSTEM_IOC_ACCESS_KEY);
+	writel(val, NETX_SYSTEM_IOC_ACCESS_KEY);
+
+	writel(phy_control | PHY_CONTROL_RESET, NETX_SYSTEM_PHY_CONTROL);
+	udelay(100);
+
+	val = readl(NETX_SYSTEM_IOC_ACCESS_KEY);
+	writel(val, NETX_SYSTEM_IOC_ACCESS_KEY);
+
+	writel(phy_control, NETX_SYSTEM_PHY_CONTROL);
+
+	return platform_driver_register(&netx_eth_driver);
+}
+
+static void __exit netx_eth_cleanup(void)
+{
+	platform_driver_unregister(&netx_eth_driver);
+}
+
+module_init(netx_eth_init);
+module_exit(netx_eth_cleanup);
+
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
+