xtensa: Add support for the Sonic Ethernet device for the XT2000 board.
Chris Zankel [Tue, 6 May 2008 06:36:35 +0000 (23:36 -0700)]
Add support for the on-board Sonic Ethernet device for the XT2000
evaluation board.

Signed-off-by: Chris Zankel <chris@zankel.net>

drivers/net/Kconfig
drivers/net/Makefile
drivers/net/xtsonic.c [new file with mode: 0644]

index 1d8af33..d15ab76 100644 (file)
@@ -464,6 +464,12 @@ config MIPS_JAZZ_SONIC
          This is the driver for the onboard card of MIPS Magnum 4000,
          Acer PICA, Olivetti M700-10 and a few other identical OEM systems.
 
+config XTENSA_XT2000_SONIC
+       tristate "Xtensa XT2000 onboard SONIC Ethernet support"
+       depends on XTENSA_PLATFORM_XT2000
+       help
+         This is the driver for the onboard card of the Xtensa XT2000 board.
+
 config MIPS_AU1X00_ENET
        bool "MIPS AU1000 Ethernet support"
        depends on SOC_AU1X00
index fa2510b..f19acf8 100644 (file)
@@ -227,6 +227,8 @@ pasemi_mac_driver-objs := pasemi_mac.o pasemi_mac_ethtool.o
 obj-$(CONFIG_MLX4_CORE) += mlx4/
 obj-$(CONFIG_ENC28J60) += enc28j60.o
 
+obj-$(CONFIG_XTENSA_XT2000_SONIC) += xtsonic.o
+
 obj-$(CONFIG_MACB) += macb.o
 
 obj-$(CONFIG_ARM) += arm/
diff --git a/drivers/net/xtsonic.c b/drivers/net/xtsonic.c
new file mode 100644 (file)
index 0000000..da42aa0
--- /dev/null
@@ -0,0 +1,319 @@
+/*
+ * xtsonic.c
+ *
+ * (C) 2001 - 2007 Tensilica Inc.
+ *     Kevin Chea <kchea@yahoo.com>
+ *     Marc Gauthier <marc@linux-xtensa.org>
+ *     Chris Zankel <chris@zankel.net>
+ *
+ * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
+ *
+ * This driver is based on work from Andreas Busse, but most of
+ * the code is rewritten.
+ *
+ * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
+ *
+ * A driver for the onboard Sonic ethernet controller on the XT2000.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/dma.h>
+
+static char xtsonic_string[] = "xtsonic";
+
+extern unsigned xtboard_nvram_valid(void);
+extern void xtboard_get_ether_addr(unsigned char *buf);
+
+#include "sonic.h"
+
+/*
+ * According to the documentation for the Sonic ethernet controller,
+ * EOBC should be 760 words (1520 bytes) for 32-bit applications, and,
+ * as such, 2 words less than the buffer size. The value for RBSIZE
+ * defined in sonic.h, however is only 1520.
+ *
+ * (Note that in 16-bit configurations, EOBC is 759 words (1518 bytes) and
+ * RBSIZE 1520 bytes)
+ */
+#undef SONIC_RBSIZE
+#define SONIC_RBSIZE   1524
+
+/*
+ * The chip provides 256 byte register space.
+ */
+#define SONIC_MEM_SIZE 0x100
+
+/*
+ * Macros to access SONIC registers
+ */
+#define SONIC_READ(reg) \
+       (0xffff & *((volatile unsigned int *)dev->base_addr+reg))
+
+#define SONIC_WRITE(reg,val) \
+       *((volatile unsigned int *)dev->base_addr+reg) = val
+
+
+/* Use 0 for production, 1 for verification, and >2 for debug */
+#ifdef SONIC_DEBUG
+static unsigned int sonic_debug = SONIC_DEBUG;
+#else
+static unsigned int sonic_debug = 1;
+#endif
+
+/*
+ * We cannot use station (ethernet) address prefixes to detect the
+ * sonic controller since these are board manufacturer depended.
+ * So we check for known Silicon Revision IDs instead.
+ */
+static unsigned short known_revisions[] =
+{
+       0x101,                  /* SONIC 83934 */
+       0xffff                  /* end of list */
+};
+
+static int xtsonic_open(struct net_device *dev)
+{
+       if (request_irq(dev->irq,&sonic_interrupt,IRQF_DISABLED,"sonic",dev)) {
+               printk(KERN_ERR "%s: unable to get IRQ %d.\n",
+                      dev->name, dev->irq);
+               return -EAGAIN;
+       }
+       return sonic_open(dev);
+}
+
+static int xtsonic_close(struct net_device *dev)
+{
+       int err;
+       err = sonic_close(dev);
+       free_irq(dev->irq, dev);
+       return err;
+}
+
+static int __init sonic_probe1(struct net_device *dev)
+{
+       static unsigned version_printed = 0;
+       unsigned int silicon_revision;
+       struct sonic_local *lp = netdev_priv(dev);
+       unsigned int base_addr = dev->base_addr;
+       int i;
+       int err = 0;
+
+       if (!request_mem_region(base_addr, 0x100, xtsonic_string))
+               return -EBUSY;
+
+       /*
+        * get the Silicon Revision ID. If this is one of the known
+        * one assume that we found a SONIC ethernet controller at
+        * the expected location.
+        */
+       silicon_revision = SONIC_READ(SONIC_SR);
+       if (sonic_debug > 1)
+               printk("SONIC Silicon Revision = 0x%04x\n",silicon_revision);
+
+       i = 0;
+       while ((known_revisions[i] != 0xffff) &&
+                       (known_revisions[i] != silicon_revision))
+               i++;
+
+       if (known_revisions[i] == 0xffff) {
+               printk("SONIC ethernet controller not found (0x%4x)\n",
+                               silicon_revision);
+               return -ENODEV;
+       }
+
+       if (sonic_debug  &&  version_printed++ == 0)
+               printk(version);
+
+       /*
+        * Put the sonic into software reset, then retrieve ethernet address.
+        * Note: we are assuming that the boot-loader has initialized the cam.
+        */
+       SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
+       SONIC_WRITE(SONIC_DCR,
+                   SONIC_DCR_WC0|SONIC_DCR_DW|SONIC_DCR_LBR|SONIC_DCR_SBUS);
+       SONIC_WRITE(SONIC_CEP,0);
+       SONIC_WRITE(SONIC_IMR,0);
+
+       SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
+       SONIC_WRITE(SONIC_CEP,0);
+
+       for (i=0; i<3; i++) {
+               unsigned int val = SONIC_READ(SONIC_CAP0-i);
+               dev->dev_addr[i*2] = val;
+               dev->dev_addr[i*2+1] = val >> 8;
+       }
+
+       /* Initialize the device structure. */
+
+       lp->dma_bitmode = SONIC_BITMODE32;
+
+       /*
+        *  Allocate local private descriptor areas in uncached space.
+        *  The entire structure must be located within the same 64kb segment.
+        *  A simple way to ensure this is to allocate twice the
+        *  size of the structure -- given that the structure is
+        *  much less than 64 kB, at least one of the halves of
+        *  the allocated area will be contained entirely in 64 kB.
+        *  We also allocate extra space for a pointer to allow freeing
+        *  this structure later on (in xtsonic_cleanup_module()).
+        */
+       lp->descriptors =
+               dma_alloc_coherent(lp->device,
+                       SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
+                       &lp->descriptors_laddr, GFP_KERNEL);
+
+       if (lp->descriptors == NULL) {
+               printk(KERN_ERR "%s: couldn't alloc DMA memory for "
+                               " descriptors.\n", lp->device->bus_id);
+               goto out;
+       }
+
+       lp->cda = lp->descriptors;
+       lp->tda = lp->cda + (SIZEOF_SONIC_CDA
+                            * SONIC_BUS_SCALE(lp->dma_bitmode));
+       lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
+                            * SONIC_BUS_SCALE(lp->dma_bitmode));
+       lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
+                            * SONIC_BUS_SCALE(lp->dma_bitmode));
+
+       /* get the virtual dma address */
+
+       lp->cda_laddr = lp->descriptors_laddr;
+       lp->tda_laddr = lp->cda_laddr + (SIZEOF_SONIC_CDA
+                                        * SONIC_BUS_SCALE(lp->dma_bitmode));
+       lp->rda_laddr = lp->tda_laddr + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
+                                        * SONIC_BUS_SCALE(lp->dma_bitmode));
+       lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
+                                        * SONIC_BUS_SCALE(lp->dma_bitmode));
+
+       dev->open = xtsonic_open;
+       dev->stop = xtsonic_close;
+       dev->hard_start_xmit    = sonic_send_packet;
+       dev->get_stats          = sonic_get_stats;
+       dev->set_multicast_list = &sonic_multicast_list;
+       dev->tx_timeout         = sonic_tx_timeout;
+       dev->watchdog_timeo     = TX_TIMEOUT;
+
+       /*
+        * clear tally counter
+        */
+       SONIC_WRITE(SONIC_CRCT,0xffff);
+       SONIC_WRITE(SONIC_FAET,0xffff);
+       SONIC_WRITE(SONIC_MPT,0xffff);
+
+       return 0;
+out:
+       release_region(dev->base_addr, SONIC_MEM_SIZE);
+       return err;
+}
+
+
+/*
+ * Probe for a SONIC ethernet controller on an XT2000 board.
+ * Actually probing is superfluous but we're paranoid.
+ */
+
+int __init xtsonic_probe(struct platform_device *pdev)
+{
+       struct net_device *dev;
+       struct sonic_local *lp;
+       struct resource *resmem, *resirq;
+       int err = 0;
+
+       DECLARE_MAC_BUF(mac);
+
+       if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0)) == NULL)
+               return -ENODEV;
+
+       if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0)) == NULL)
+               return -ENODEV;
+
+       if ((dev = alloc_etherdev(sizeof(struct sonic_local))) == NULL)
+               return -ENOMEM;
+
+       lp = netdev_priv(dev);
+       lp->device = &pdev->dev;
+       SET_NETDEV_DEV(dev, &pdev->dev);
+       netdev_boot_setup_check(dev);
+
+       dev->base_addr = resmem->start;
+       dev->irq = resirq->start;
+
+       if ((err = sonic_probe1(dev)))
+               goto out;
+       if ((err = register_netdev(dev)))
+               goto out1;
+
+       printk("%s: SONIC ethernet @%08lx, MAC %s, IRQ %d\n", dev->name,
+              dev->base_addr, print_mac(mac, dev->dev_addr), dev->irq);
+
+       return 0;
+
+out1:
+       release_region(dev->base_addr, SONIC_MEM_SIZE);
+out:
+       free_netdev(dev);
+
+       return err;
+}
+
+MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver");
+module_param(sonic_debug, int, 0);
+MODULE_PARM_DESC(sonic_debug, "xtsonic debug level (1-4)");
+
+#include "sonic.c"
+
+static int __devexit xtsonic_device_remove (struct platform_device *pdev)
+{
+       struct net_device *dev = platform_get_drvdata(pdev);
+       struct sonic_local *lp = netdev_priv(dev);
+
+       unregister_netdev(dev);
+       dma_free_coherent(lp->device,
+                         SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
+                         lp->descriptors, lp->descriptors_laddr);
+       release_region (dev->base_addr, SONIC_MEM_SIZE);
+       free_netdev(dev);
+
+       return 0;
+}
+
+static struct platform_driver xtsonic_driver = {
+       .probe = xtsonic_probe,
+       .remove = __devexit_p(xtsonic_device_remove),
+       .driver = {
+               .name = xtsonic_string,
+       },
+};
+
+static int __init xtsonic_init(void)
+{
+       return platform_driver_register(&xtsonic_driver);
+}
+
+static void __exit xtsonic_cleanup(void)
+{
+       platform_driver_unregister(&xtsonic_driver);
+}
+
+module_init(xtsonic_init);
+module_exit(xtsonic_cleanup);