1 files changed, 548 insertions, 0 deletions

diff --git a/arch/ia64/sn/kernel/tiocx.c b/arch/ia64/sn/kernel/tiocx.c
new file mode 100644
index 000000000000..66190d7e492d
--- /dev/null
+++ b/arch/ia64/sn/kernel/tiocx.c
@@ -0,0 +1,548 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2005 Silicon Graphics, Inc.  All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/proc_fs.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <asm/uaccess.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/sn/addrs.h>
+#include <asm/sn/io.h>
+#include <asm/sn/types.h>
+#include <asm/sn/shubio.h>
+#include <asm/sn/tiocx.h>
+#include "tio.h"
+#include "xtalk/xwidgetdev.h"
+#include "xtalk/hubdev.h"
+
+#define CX_DEV_NONE 0
+#define DEVICE_NAME "tiocx"
+#define WIDGET_ID 0
+#define TIOCX_DEBUG 0
+
+#if TIOCX_DEBUG
+#define DBG(fmt...)    printk(KERN_ALERT fmt)
+#else
+#define DBG(fmt...)
+#endif
+
+struct device_attribute dev_attr_cxdev_control;
+
+/**
+ * tiocx_match - Try to match driver id list with device.
+ * @dev: device pointer
+ * @drv: driver pointer
+ *
+ * Returns 1 if match, 0 otherwise.
+ */
+static int tiocx_match(struct device *dev, struct device_driver *drv)
+{
+        struct cx_dev *cx_dev = to_cx_dev(dev);
+        struct cx_drv *cx_drv = to_cx_driver(drv);
+        const struct cx_device_id *ids = cx_drv->id_table;
+
+        if (!ids)
+                return 0;
+
+        while (ids->part_num) {
+                if (ids->part_num == cx_dev->cx_id.part_num)
+                        return 1;
+                ids++;
+        }
+        return 0;
+
+}
+
+static int tiocx_hotplug(struct device *dev, char **envp, int num_envp,
+                         char *buffer, int buffer_size)
+{
+        return -ENODEV;
+}
+
+static void tiocx_bus_release(struct device *dev)
+{
+        kfree(to_cx_dev(dev));
+}
+
+struct bus_type tiocx_bus_type = {
+        .name = "tiocx",
+        .match = tiocx_match,
+        .hotplug = tiocx_hotplug,
+};
+
+/**
+ * cx_device_match - Find cx_device in the id table.
+ * @ids: id table from driver
+ * @cx_device: part/mfg id for the device
+ *
+ */
+static const struct cx_device_id *cx_device_match(const struct cx_device_id
+                                                  *ids,
+                                                  struct cx_dev *cx_device)
+{
+        /*
+         * NOTES: We may want to check for CX_ANY_ID too.
+         *        Do we want to match against nasid too?
+         *        CX_DEV_NONE == 0, if the driver tries to register for
+         *        part/mfg == 0 we should return no-match (NULL) here.
+         */
+        while (ids->part_num && ids->mfg_num) {
+                if (ids->part_num == cx_device->cx_id.part_num &&
+                    ids->mfg_num == cx_device->cx_id.mfg_num)
+                        return ids;
+                ids++;
+        }
+
+        return NULL;
+}
+
+/**
+ * cx_device_probe - Look for matching device.
+ *                      Call driver probe routine if found.
+ * @cx_driver: driver table (cx_drv struct) from driver
+ * @cx_device: part/mfg id for the device
+ */
+static int cx_device_probe(struct device *dev)
+{
+        const struct cx_device_id *id;
+        struct cx_drv *cx_drv = to_cx_driver(dev->driver);
+        struct cx_dev *cx_dev = to_cx_dev(dev);
+        int error = 0;
+
+        if (!cx_dev->driver && cx_drv->probe) {
+                id = cx_device_match(cx_drv->id_table, cx_dev);
+                if (id) {
+                        if ((error = cx_drv->probe(cx_dev, id)) < 0)
+                                return error;
+                        else
+                                cx_dev->driver = cx_drv;
+                }
+        }
+
+        return error;
+}
+
+/**
+ * cx_driver_remove - Remove driver from device struct.
+ * @dev: device
+ */
+static int cx_driver_remove(struct device *dev)
+{
+        struct cx_dev *cx_dev = to_cx_dev(dev);
+        struct cx_drv *cx_drv = cx_dev->driver;
+        if (cx_drv->remove)
+                cx_drv->remove(cx_dev);
+        cx_dev->driver = NULL;
+        return 0;
+}
+
+/**
+ * cx_driver_register - Register the driver.
+ * @cx_driver: driver table (cx_drv struct) from driver
+ * 
+ * Called from the driver init routine to register a driver.
+ * The cx_drv struct contains the driver name, a pointer to
+ * a table of part/mfg numbers and a pointer to the driver's
+ * probe/attach routine.
+ */
+int cx_driver_register(struct cx_drv *cx_driver)
+{
+        cx_driver->driver.name = cx_driver->name;
+        cx_driver->driver.bus = &tiocx_bus_type;
+        cx_driver->driver.probe = cx_device_probe;
+        cx_driver->driver.remove = cx_driver_remove;
+
+        return driver_register(&cx_driver->driver);
+}
+
+/**
+ * cx_driver_unregister - Unregister the driver.
+ * @cx_driver: driver table (cx_drv struct) from driver
+ */
+int cx_driver_unregister(struct cx_drv *cx_driver)
+{
+        driver_unregister(&cx_driver->driver);
+        return 0;
+}
+
+/**
+ * cx_device_register - Register a device.
+ * @nasid: device's nasid
+ * @part_num: device's part number
+ * @mfg_num: device's manufacturer number
+ * @hubdev: hub info associated with this device
+ *
+ */
+int
+cx_device_register(nasid_t nasid, int part_num, int mfg_num,
+                   struct hubdev_info *hubdev)
+{
+        struct cx_dev *cx_dev;
+
+        cx_dev = kcalloc(1, sizeof(struct cx_dev), GFP_KERNEL);
+        DBG("cx_dev= 0x%p\n", cx_dev);
+        if (cx_dev == NULL)
+                return -ENOMEM;
+
+        cx_dev->cx_id.part_num = part_num;
+        cx_dev->cx_id.mfg_num = mfg_num;
+        cx_dev->cx_id.nasid = nasid;
+        cx_dev->hubdev = hubdev;
+
+        cx_dev->dev.parent = NULL;
+        cx_dev->dev.bus = &tiocx_bus_type;
+        cx_dev->dev.release = tiocx_bus_release;
+        snprintf(cx_dev->dev.bus_id, BUS_ID_SIZE, "%d.0x%x",
+                 cx_dev->cx_id.nasid, cx_dev->cx_id.part_num);
+        device_register(&cx_dev->dev);
+        get_device(&cx_dev->dev);
+
+        device_create_file(&cx_dev->dev, &dev_attr_cxdev_control);
+
+        return 0;
+}
+
+/**
+ * cx_device_unregister - Unregister a device.
+ * @cx_dev: part/mfg id for the device
+ */
+int cx_device_unregister(struct cx_dev *cx_dev)
+{
+        put_device(&cx_dev->dev);
+        device_unregister(&cx_dev->dev);
+        return 0;
+}
+
+/**
+ * cx_device_reload - Reload the device.
+ * @nasid: device's nasid
+ * @part_num: device's part number
+ * @mfg_num: device's manufacturer number
+ *
+ * Remove the device associated with 'nasid' from device list and then
+ * call device-register with the given part/mfg numbers.
+ */
+static int cx_device_reload(struct cx_dev *cx_dev)
+{
+        device_remove_file(&cx_dev->dev, &dev_attr_cxdev_control);
+        cx_device_unregister(cx_dev);
+        return cx_device_register(cx_dev->cx_id.nasid, cx_dev->cx_id.part_num,
+                                  cx_dev->cx_id.mfg_num, cx_dev->hubdev);
+}
+
+static inline uint64_t tiocx_intr_alloc(nasid_t nasid, int widget,
+                                        u64 sn_irq_info,
+                                        int req_irq, nasid_t req_nasid,
+                                        int req_slice)
+{
+        struct ia64_sal_retval rv;
+        rv.status = 0;
+        rv.v0 = 0;
+
+        ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
+                                SAL_INTR_ALLOC, nasid,
+                                widget, sn_irq_info, req_irq,
+                                req_nasid, req_slice);
+        return rv.status;
+}
+
+static inline void tiocx_intr_free(nasid_t nasid, int widget,
+                                   struct sn_irq_info *sn_irq_info)
+{
+        struct ia64_sal_retval rv;
+        rv.status = 0;
+        rv.v0 = 0;
+
+        ia64_sal_oemcall_nolock(&rv, SN_SAL_IOIF_INTERRUPT,
+                                SAL_INTR_FREE, nasid,
+                                widget, sn_irq_info->irq_irq,
+                                sn_irq_info->irq_cookie, 0, 0);
+}
+
+struct sn_irq_info *tiocx_irq_alloc(nasid_t nasid, int widget, int irq,
+                                    nasid_t req_nasid, int slice)
+{
+        struct sn_irq_info *sn_irq_info;
+        int status;
+        int sn_irq_size = sizeof(struct sn_irq_info);
+
+        if ((nasid & 1) == 0)
+                return NULL;
+
+        sn_irq_info = kmalloc(sn_irq_size, GFP_KERNEL);
+        if (sn_irq_info == NULL)
+                return NULL;
+
+        memset(sn_irq_info, 0x0, sn_irq_size);
+
+        status = tiocx_intr_alloc(nasid, widget, __pa(sn_irq_info), irq,
+                                  req_nasid, slice);
+        if (status) {
+                kfree(sn_irq_info);
+                return NULL;
+        } else {
+                return sn_irq_info;
+        }
+}
+
+void tiocx_irq_free(struct sn_irq_info *sn_irq_info)
+{
+        uint64_t bridge = (uint64_t) sn_irq_info->irq_bridge;
+        nasid_t nasid = NASID_GET(bridge);
+        int widget;
+
+        if (nasid & 1) {
+                widget = TIO_SWIN_WIDGETNUM(bridge);
+                tiocx_intr_free(nasid, widget, sn_irq_info);
+                kfree(sn_irq_info);
+        }
+}
+
+uint64_t
+tiocx_dma_addr(uint64_t addr)
+{
+        return PHYS_TO_TIODMA(addr);
+}
+
+uint64_t
+tiocx_swin_base(int nasid)
+{
+        return TIO_SWIN_BASE(nasid, TIOCX_CORELET);
+}
+
+EXPORT_SYMBOL(cx_driver_register);
+EXPORT_SYMBOL(cx_driver_unregister);
+EXPORT_SYMBOL(cx_device_register);
+EXPORT_SYMBOL(cx_device_unregister);
+EXPORT_SYMBOL(tiocx_irq_alloc);
+EXPORT_SYMBOL(tiocx_irq_free);
+EXPORT_SYMBOL(tiocx_bus_type);
+EXPORT_SYMBOL(tiocx_dma_addr);
+EXPORT_SYMBOL(tiocx_swin_base);
+
+static uint64_t tiocx_get_hubdev_info(u64 handle, u64 address)
+{
+
+        struct ia64_sal_retval ret_stuff;
+        ret_stuff.status = 0;
+        ret_stuff.v0 = 0;
+
+        ia64_sal_oemcall_nolock(&ret_stuff,
+                                SN_SAL_IOIF_GET_HUBDEV_INFO,
+                                handle, address, 0, 0, 0, 0, 0);
+        return ret_stuff.v0;
+}
+
+static void tio_conveyor_set(nasid_t nasid, int enable_flag)
+{
+        uint64_t ice_frz;
+        uint64_t disable_cb = (1ull << 61);
+
+        if (!(nasid & 1))
+                return;
+
+        ice_frz = REMOTE_HUB_L(nasid, TIO_ICE_FRZ_CFG);
+        if (enable_flag) {
+                if (!(ice_frz & disable_cb))    /* already enabled */
+                        return;
+                ice_frz &= ~disable_cb;
+        } else {
+                if (ice_frz & disable_cb)       /* already disabled */
+                        return;
+                ice_frz |= disable_cb;
+        }
+        DBG(KERN_ALERT "TIO_ICE_FRZ_CFG= 0x%lx\n", ice_frz);
+        REMOTE_HUB_S(nasid, TIO_ICE_FRZ_CFG, ice_frz);
+}
+
+#define tio_conveyor_enable(nasid) tio_conveyor_set(nasid, 1)
+#define tio_conveyor_disable(nasid) tio_conveyor_set(nasid, 0)
+
+static void tio_corelet_reset(nasid_t nasid, int corelet)
+{
+        if (!(nasid & 1))
+                return;
+
+        REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 1 << corelet);
+        udelay(2000);
+        REMOTE_HUB_S(nasid, TIO_ICE_PMI_TX_CFG, 0);
+        udelay(2000);
+}
+
+static int fpga_attached(nasid_t nasid)
+{
+        uint64_t cx_credits;
+
+        cx_credits = REMOTE_HUB_L(nasid, TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3);
+        cx_credits &= TIO_ICE_PMI_TX_DYN_CREDIT_STAT_CB3_CREDIT_CNT_MASK;
+        DBG("cx_credits= 0x%lx\n", cx_credits);
+
+        return (cx_credits == 0xf) ? 1 : 0;
+}
+
+static int tiocx_reload(struct cx_dev *cx_dev)
+{
+        int part_num = CX_DEV_NONE;
+        int mfg_num = CX_DEV_NONE;
+        nasid_t nasid = cx_dev->cx_id.nasid;
+
+        if (fpga_attached(nasid)) {
+                uint64_t cx_id;
+
+                cx_id =
+                    *(volatile int32_t *)(TIO_SWIN_BASE(nasid, TIOCX_CORELET) +
+                                          WIDGET_ID);
+                part_num = XWIDGET_PART_NUM(cx_id);
+                mfg_num = XWIDGET_MFG_NUM(cx_id);
+                DBG("part= 0x%x, mfg= 0x%x\n", part_num, mfg_num);
+                /* just ignore it if it's a CE */
+                if (part_num == TIO_CE_ASIC_PARTNUM)
+                        return 0;
+        }
+
+        cx_dev->cx_id.part_num = part_num;
+        cx_dev->cx_id.mfg_num = mfg_num;
+
+        /*
+         * Delete old device and register the new one.  It's ok if
+         * part_num/mfg_num == CX_DEV_NONE.  We want to register
+         * devices in the table even if a bitstream isn't loaded.
+         * That allows use to see that a bitstream isn't loaded via
+         * TIOCX_IOCTL_DEV_LIST.
+         */
+        return cx_device_reload(cx_dev);
+}
+
+static ssize_t show_cxdev_control(struct device *dev, char *buf)
+{
+        struct cx_dev *cx_dev = to_cx_dev(dev);
+
+        return sprintf(buf, "0x%x 0x%x 0x%x\n",
+                       cx_dev->cx_id.nasid,
+                       cx_dev->cx_id.part_num, cx_dev->cx_id.mfg_num);
+}
+
+static ssize_t store_cxdev_control(struct device *dev, const char *buf,
+                                   size_t count)
+{
+        int n;
+        struct cx_dev *cx_dev = to_cx_dev(dev);
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        if (count <= 0)
+                return 0;
+
+        n = simple_strtoul(buf, NULL, 0);
+
+        switch (n) {
+        case 1:
+                tiocx_reload(cx_dev);
+                break;
+        case 3:
+                tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
+                break;
+        default:
+                break;
+        }
+
+        return count;
+}
+
+DEVICE_ATTR(cxdev_control, 0644, show_cxdev_control, store_cxdev_control);
+
+static int __init tiocx_init(void)
+{
+        cnodeid_t cnodeid;
+        int found_tiocx_device = 0;
+
+        bus_register(&tiocx_bus_type);
+
+        for (cnodeid = 0; cnodeid < MAX_COMPACT_NODES; cnodeid++) {
+                nasid_t nasid;
+
+                if ((nasid = cnodeid_to_nasid(cnodeid)) < 0)
+                        break;  /* No more nasids .. bail out of loop */
+
+                if (nasid & 0x1) {      /* TIO's are always odd */
+                        struct hubdev_info *hubdev;
+                        uint64_t status;
+                        struct xwidget_info *widgetp;
+
+                        DBG("Found TIO at nasid 0x%x\n", nasid);
+
+                        hubdev =
+                            (struct hubdev_info *)(NODEPDA(cnodeid)->pdinfo);
+                        status =
+                            tiocx_get_hubdev_info(nasid,
+                                                  (uint64_t) __pa(hubdev));
+                        if (status)
+                                continue;
+
+                        widgetp = &hubdev->hdi_xwidget_info[TIOCX_CORELET];
+
+                        /* The CE hangs off of the CX port but is not an FPGA */
+                        if (widgetp->xwi_hwid.part_num == TIO_CE_ASIC_PARTNUM)
+                                continue;
+
+                        tio_corelet_reset(nasid, TIOCX_CORELET);
+                        tio_conveyor_enable(nasid);
+
+                        if (cx_device_register
+                            (nasid, widgetp->xwi_hwid.part_num,
+                             widgetp->xwi_hwid.mfg_num, hubdev) < 0)
+                                return -ENXIO;
+                        else
+                                found_tiocx_device++;
+                }
+        }
+
+        /* It's ok if we find zero devices. */
+        DBG("found_tiocx_device= %d\n", found_tiocx_device);
+
+        return 0;
+}
+
+static void __exit tiocx_exit(void)
+{
+        struct device *dev;
+        struct device *tdev;
+
+        DBG("tiocx_exit\n");
+
+        /*
+         * Unregister devices.
+         */
+        list_for_each_entry_safe(dev, tdev, &tiocx_bus_type.devices.list,
+                                 bus_list) {
+                if (dev) {
+                        struct cx_dev *cx_dev = to_cx_dev(dev);
+                        device_remove_file(dev, &dev_attr_cxdev_control);
+                        cx_device_unregister(cx_dev);
+                }
+        }
+
+        bus_unregister(&tiocx_bus_type);
+}
+
+module_init(tiocx_init);
+module_exit(tiocx_exit);
+
+/************************************************************************
+ * Module licensing and description
+ ************************************************************************/
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bruce Losure <blosure@sgi.com>");
+MODULE_DESCRIPTION("TIOCX module");
+MODULE_SUPPORTED_DEVICE(DEVICE_NAME);