/*
* 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/device.h>
#include <linux/delay.h>
#include <asm/system.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 <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_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
* @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;
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;
snprintf(cx_dev->dev.bus_id, BUS_ID_SIZE, "%d",
cx_dev->cx_id.nasid);
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)
{
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 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 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 is_fpga_tio(int nasid, int *bt)
{
int ioboard_type;
ioboard_type = ia64_sn_sysctl_ioboard_get(nasid);
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)
{
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 (bitstream_loaded(nasid)) {
uint64_t 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 uint64_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, 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;
if (!ia64_platform_is("sn2"))
return -ENODEV;
bus_register(&tiocx_bus_type);
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);
}
subsys_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);
