xtensa: Add support for the Sonic Ethernet device for the XT2000 board.

Add support for the on-board Sonic Ethernet device for the XT2000
evaluation board.

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

1 files changed, 319 insertions, 0 deletions

diff --git a/drivers/net/xtsonic.c b/drivers/net/xtsonic.c
new file mode 100644
index 000000000000..da42aa06a3ba
--- /dev/null
+++ b/drivers/net/xtsonic.c
@@ -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);