Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 569 insertions, 0 deletions

diff --git a/arch/ia64/sn/kernel/tiocx.c b/arch/ia64/sn/kernel/tiocx.c
new file mode 100644
index 000000000..32d0380eb
--- /dev/null
+++ b/arch/ia64/sn/kernel/tiocx.c
@@ -0,0 +1,569 @@
+/*
+ * 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/slab.h>
+#include <linux/spinlock.h>
+#include <linux/proc_fs.h>
+#include <linux/capability.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/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 <asm/sn/l1.h>
+#include <asm/sn/module.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_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	return -ENODEV;
+}
+
+static void tiocx_bus_release(struct device *dev)
+{
+	kfree(to_cx_dev(dev));
+}
+
+/**
+ * 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;
+}
+
+struct bus_type tiocx_bus_type = {
+	.name = "tiocx",
+	.match = tiocx_match,
+	.uevent = tiocx_uevent,
+	.probe = cx_device_probe,
+	.remove = cx_driver_remove,
+};
+
+/**
+ * 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;
+
+	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
+ * @bt: board type of the device
+ *
+ */
+int
+cx_device_register(nasid_t nasid, int part_num, int mfg_num,
+		   struct hubdev_info *hubdev, int bt)
+{
+	struct cx_dev *cx_dev;
+	int r;
+
+	cx_dev = kzalloc(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->bt = bt;
+
+	cx_dev->dev.parent = NULL;
+	cx_dev->dev.bus = &tiocx_bus_type;
+	cx_dev->dev.release = tiocx_bus_release;
+	dev_set_name(&cx_dev->dev, "%d", cx_dev->cx_id.nasid);
+	r = device_register(&cx_dev->dev);
+	if (r) {
+		kfree(cx_dev);
+		return r;
+	}
+	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)
+{
+	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,
+				  cx_dev->bt);
+}
+
+static inline u64 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 = kzalloc(sn_irq_size, GFP_KERNEL);
+	if (sn_irq_info == NULL)
+		return NULL;
+
+	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)
+{
+	u64 bridge = (u64) 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);
+	}
+}
+
+u64 tiocx_dma_addr(u64 addr)
+{
+	return PHYS_TO_TIODMA(addr);
+}
+
+u64 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 void tio_conveyor_set(nasid_t nasid, int enable_flag)
+{
+	u64 ice_frz;
+	u64 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 is_fpga_tio(int nasid, int *bt)
+{
+	u16 uninitialized_var(ioboard_type);	/* GCC be quiet */
+	long rc;
+
+	rc = ia64_sn_sysctl_ioboard_get(nasid, &ioboard_type);
+	if (rc) {
+		printk(KERN_WARNING "ia64_sn_sysctl_ioboard_get failed: %ld\n",
+		       rc);
+		return 0;
+	}
+
+	switch (ioboard_type) {
+	case L1_BRICKTYPE_SA:
+	case L1_BRICKTYPE_ATHENA:
+	case L1_BOARDTYPE_DAYTONA:
+		*bt = ioboard_type;
+		return 1;
+	}
+
+	return 0;
+}
+
+static int bitstream_loaded(nasid_t nasid)
+{
+	u64 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 (bitstream_loaded(nasid)) {
+		u64 cx_id;
+		int rv;
+
+		rv = ia64_sn_sysctl_tio_clock_reset(nasid);
+		if (rv) {
+			printk(KERN_ALERT "CX port JTAG reset failed.\n");
+		} else {
+			cx_id = *(volatile u64 *)
+				(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, struct device_attribute *attr, char *buf)
+{
+	struct cx_dev *cx_dev = to_cx_dev(dev);
+
+	return sprintf(buf, "0x%x 0x%x 0x%x 0x%x\n",
+		       cx_dev->cx_id.nasid,
+		       cx_dev->cx_id.part_num, cx_dev->cx_id.mfg_num,
+		       cx_dev->bt);
+}
+
+static ssize_t store_cxdev_control(struct device *dev, struct device_attribute *attr, 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:
+		tio_corelet_reset(cx_dev->cx_id.nasid, TIOCX_CORELET);
+		tiocx_reload(cx_dev);
+		break;
+	case 2:
+		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;
+	int err;
+
+	if (!ia64_platform_is("sn2"))
+		return 0;
+
+	err = bus_register(&tiocx_bus_type);
+	if (err)
+		return err;
+
+	for (cnodeid = 0; cnodeid < num_cnodes; cnodeid++) {
+		nasid_t nasid;
+		int bt;
+
+		nasid = cnodeid_to_nasid(cnodeid);
+
+		if ((nasid & 0x1) && is_fpga_tio(nasid, &bt)) {
+			struct hubdev_info *hubdev;
+			struct xwidget_info *widgetp;
+
+			DBG("Found TIO at nasid 0x%x\n", nasid);
+
+			hubdev =
+			    (struct hubdev_info *)(NODEPDA(cnodeid)->pdinfo);
+
+			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, bt) < 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 int cx_remove_device(struct device * dev, void * data)
+{
+	struct cx_dev *cx_dev = to_cx_dev(dev);
+	device_remove_file(dev, &dev_attr_cxdev_control);
+	cx_device_unregister(cx_dev);
+	return 0;
+}
+
+static void __exit tiocx_exit(void)
+{
+	DBG("tiocx_exit\n");
+
+	/*
+	 * Unregister devices.
+	 */
+	bus_for_each_dev(&tiocx_bus_type, NULL, NULL, cx_remove_device);
+	bus_unregister(&tiocx_bus_type);
+}
+
+fs_initcall(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);