/*
* 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) 1992-1997,2000-2003 Silicon Graphics, Inc. All rights reserved.
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <asm/sn/sn2/sn_private.h>
#include <asm/sn/iograph.h>
#include <asm/sn/simulator.h>
#include <asm/sn/hcl.h>
#include <asm/sn/hcl_util.h>
/* #define DEBUG 1 */
/* #define XBOW_DEBUG 1 */
#define kdebug 0
/*
* This file supports the Xbow chip. Main functions: initializtion,
* error handling.
*/
/*
* each vertex corresponding to an xbow chip
* has a "fastinfo" pointer pointing at one
* of these things.
*/
struct xbow_soft_s {
vertex_hdl_t conn; /* our connection point */
vertex_hdl_t vhdl; /* xbow's private vertex */
vertex_hdl_t busv; /* the xswitch vertex */
xbow_t *base; /* PIO pointer to crossbow chip */
char *name; /* hwgraph name */
xbow_link_status_t xbow_link_status[MAX_XBOW_PORTS];
widget_cfg_t *wpio[MAX_XBOW_PORTS]; /* cached PIO pointer */
/* Bandwidth allocation state. Bandwidth values are for the
* destination port since contention happens there.
* Implicit mapping from xbow ports (8..f) -> (0..7) array indices.
*/
unsigned long long bw_hiwm[MAX_XBOW_PORTS]; /* hiwater mark values */
unsigned long long bw_cur_used[MAX_XBOW_PORTS]; /* bw used currently */
};
#define xbow_soft_set(v,i) hwgraph_fastinfo_set((v), (arbitrary_info_t)(i))
#define xbow_soft_get(v) ((struct xbow_soft_s *)hwgraph_fastinfo_get((v)))
/*
* Function Table of Contents
*/
int xbow_attach(vertex_hdl_t);
int xbow_widget_present(xbow_t *, int);
static int xbow_link_alive(xbow_t *, int);
vertex_hdl_t xbow_widget_lookup(vertex_hdl_t, int);
void xbow_intr_preset(void *, int, xwidgetnum_t, iopaddr_t, xtalk_intr_vector_t);
static void xbow_setwidint(xtalk_intr_t);
xswitch_reset_link_f xbow_reset_link;
xswitch_provider_t xbow_provider =
{
xbow_reset_link,
};
static int
xbow_mmap(struct file * file, struct vm_area_struct * vma)
{
unsigned long phys_addr;
int error;
phys_addr = (unsigned long)file->private_data & ~0xc000000000000000; /* Mask out the Uncache bits */
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
vma->vm_flags |= VM_RESERVED | VM_IO;
error = io_remap_page_range(vma, vma->vm_start, phys_addr,
vma->vm_end-vma->vm_start,
vma->vm_page_prot);
return(error);
}
/*
* This is the file operation table for the pcibr driver.
* As each of the functions are implemented, put the
* appropriate function name below.
*/
struct file_operations xbow_fops = {
.owner = THIS_MODULE,
.mmap = xbow_mmap,
};
#ifdef XBRIDGE_REGS_SIM
/* xbow_set_simulated_regs: sets xbow regs as needed
* for powering through the boot
*/
void
xbow_set_simulated_regs(xbow_t *xbow, int port)
{
/*
* turn on link
*/
xbow->xb_link(port).link_status = (1<<31);
/*
* and give it a live widget too
*/
xbow->xb_link(port).link_aux_status = XB_AUX_STAT_PRESENT;
/*
* zero the link control reg
*/
xbow->xb_link(port).link_control = 0x0;
}
#endif /* XBRIDGE_REGS_SIM */
/*
* xbow_attach: the crosstalk provider has
* determined that there is a crossbow widget
* present, and has handed us the connection
* point for that vertex.
*
* We not only add our own vertex, but add
* some "xtalk switch" data to the switch
* vertex (at the connect point's parent) if
* it does not have any.
*/
/*ARGSUSED */
int
xbow_attach(vertex_hdl_t conn)
{
/*REFERENCED */
vertex_hdl_t vhdl;
vertex_hdl_t busv;
xbow_t *xbow;
struct xbow_soft_s *soft;
int port;
xswitch_info_t info;
xtalk_intr_t intr_hdl;
char devnm[MAXDEVNAME], *s;
xbowreg_t id;
int rev;
int i;
int xbow_num;
#if DEBUG && ATTACH_DEBUG
char name[MAXDEVNAME];
#endif
static void xbow_errintr_handler(int, void *, struct pt_regs *);
#if DEBUG && ATTACH_DEBUG
printk("%s: xbow_attach\n", vertex_to_name(conn, name, MAXDEVNAME));
#endif
/*
* Get a PIO pointer to the base of the crossbow
* chip.
*/
#ifdef XBRIDGE_REGS_SIM
printk("xbow_attach: XBRIDGE_REGS_SIM FIXME: allocating %ld bytes for xbow_s\n", sizeof(xbow_t));
xbow = (xbow_t *) kmalloc(sizeof(xbow_t), GFP_KERNEL);
if (!xbow)
return -ENOMEM;
/*
* turn on ports e and f like in a real live ibrick
*/
xbow_set_simulated_regs(xbow, 0xe);
xbow_set_simulated_regs(xbow, 0xf);
#else
xbow = (xbow_t *) xtalk_piotrans_addr(conn, 0, 0, sizeof(xbow_t), 0);
#endif /* XBRIDGE_REGS_SIM */
/*
* Locate the "switch" vertex: it is the parent
* of our connection point.
*/
busv = hwgraph_connectpt_get(conn);
#if DEBUG && ATTACH_DEBUG
printk("xbow_attach: Bus Vertex 0x%p, conn 0x%p, xbow register 0x%p wid= 0x%x\n", busv, conn, xbow, *(volatile u32 *)xbow);
#endif
ASSERT(busv != GRAPH_VERTEX_NONE);
/*
* Create our private vertex, and connect our
* driver information to it. This makes it possible
* for diagnostic drivers to open the crossbow
* vertex for access to registers.
*/
/*
* Register a xbow driver with hwgraph.
* file ops.
*/
vhdl = hwgraph_register(conn, EDGE_LBL_XBOW, 0,
0, 0, 0,
S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, 0, 0,
(struct file_operations *)&xbow_fops, (void *)xbow);
if (!vhdl) {
printk(KERN_WARNING "xbow_attach: Unable to create char device for xbow conn %p\n",
(void *)conn);
}
/*
* Allocate the soft state structure and attach
* it to the xbow's vertex
*/
soft = kmalloc(sizeof(*soft), GFP_KERNEL);
if (!soft)
return -ENOMEM;
soft->conn = conn;
soft->vhdl = vhdl;
soft->busv = busv;
soft->base = xbow;
/* does the universe really need another macro? */
/* xbow_soft_set(vhdl, (arbitrary_info_t) soft); */
/* hwgraph_fastinfo_set(vhdl, (arbitrary_info_t) soft); */
#define XBOW_NUM_SUFFIX_FORMAT "[xbow# %d]"
/* Add xbow number as a suffix to the hwgraph name of the xbow.
* This is helpful while looking at the error/warning messages.
*/
xbow_num = 0;
/*
* get the name of this xbow vertex and keep the info.
* This is needed during errors and interupts, but as
* long as we have it, we can use it elsewhere.
*/
s = dev_to_name(vhdl, devnm, MAXDEVNAME);
soft->name = kmalloc(strlen(s) + strlen(XBOW_NUM_SUFFIX_FORMAT) + 1,
GFP_KERNEL);
if (!soft->name) {
kfree(soft);
return -ENOMEM;
}
sprintf(soft->name,"%s"XBOW_NUM_SUFFIX_FORMAT, s,xbow_num);
#ifdef XBRIDGE_REGS_SIM
/* my o200/ibrick has id=0x2d002049, but XXBOW_WIDGET_PART_NUM is defined
* as 0xd000, so I'm using that for the partnum bitfield.
*/
printk("xbow_attach: XBRIDGE_REGS_SIM FIXME: need xb_wid_id value!!\n");
id = 0x2d000049;
#else
id = xbow->xb_wid_id;
#endif /* XBRIDGE_REGS_SIM */
rev = XWIDGET_PART_REV_NUM(id);
#define XBOW_16_BIT_PORT_BW_MAX (800 * 1000 * 1000) /* 800 MB/s */
/* Set bandwidth hiwatermark and current values */
for (i = 0; i < MAX_XBOW_PORTS; i++) {
soft->bw_hiwm[i] = XBOW_16_BIT_PORT_BW_MAX; /* for now */
soft->bw_cur_used[i] = 0;
}
/*
* attach the crossbow error interrupt.
*/
intr_hdl = xtalk_intr_alloc(conn, (device_desc_t)0, vhdl);
ASSERT(intr_hdl != NULL);
{
int irq = ((hub_intr_t)intr_hdl)->i_bit;
int cpu = ((hub_intr_t)intr_hdl)->i_cpuid;
intr_unreserve_level(cpu, irq);
((hub_intr_t)intr_hdl)->i_bit = SGI_XBOW_ERROR;
}
xtalk_intr_connect(intr_hdl,
(intr_func_t) xbow_errintr_handler,
(intr_arg_t) soft,
(xtalk_intr_setfunc_t) xbow_setwidint,
(void *) xbow);
request_irq(SGI_XBOW_ERROR, (void *)xbow_errintr_handler, SA_SHIRQ, "XBOW error",
(intr_arg_t) soft);
/*
* Enable xbow error interrupts
*/
xbow->xb_wid_control = (XB_WID_CTRL_REG_ACC_IE | XB_WID_CTRL_XTALK_IE);
/*
* take a census of the widgets present,
* leaving notes at the switch vertex.
*/
info = xswitch_info_new(busv);
for (port = MAX_PORT_NUM - MAX_XBOW_PORTS;
port < MAX_PORT_NUM; ++port) {
if (!xbow_link_alive(xbow, port)) {
#if DEBUG && XBOW_DEBUG
printk(KERN_INFO "0x%p link %d is not alive\n",
(void *)busv, port);
#endif
continue;
}
if (!xbow_widget_present(xbow, port)) {
#if DEBUG && XBOW_DEBUG
printk(KERN_INFO "0x%p link %d is alive but no widget is present\n", (void *)busv, port);
#endif
continue;
}
#if DEBUG && XBOW_DEBUG
printk(KERN_INFO "0x%p link %d has a widget\n",
(void *)busv, port);
#endif
xswitch_info_link_is_ok(info, port);
/*
* Turn some error interrupts on
* and turn others off. The PROM has
* some things turned on we don't
* want to see (bandwidth allocation
* errors for instance); so if it
* is not listed here, it is not on.
*/
xbow->xb_link(port).link_control =
( (xbow->xb_link(port).link_control
/*
* Turn off these bits; they are non-fatal,
* but we might want to save some statistics
* on the frequency of these errors.
* XXX FIXME XXX
*/
& ~XB_CTRL_RCV_CNT_OFLOW_IE
& ~XB_CTRL_XMT_CNT_OFLOW_IE
& ~XB_CTRL_BNDWDTH_ALLOC_IE
& ~XB_CTRL_RCV_IE)
/*
* These are the ones we want to turn on.
*/
| (XB_CTRL_ILLEGAL_DST_IE
| XB_CTRL_OALLOC_IBUF_IE
| XB_CTRL_XMT_MAX_RTRY_IE
| XB_CTRL_MAXREQ_TOUT_IE
| XB_CTRL_XMT_RTRY_IE
| XB_CTRL_SRC_TOUT_IE) );
}
xswitch_provider_register(busv, &xbow_provider);
return 0; /* attach successful */
}
/*
* xbow_widget_present: See if a device is present
* on the specified port of this crossbow.
*/
int
xbow_widget_present(xbow_t *xbow, int port)
{
if ( IS_RUNNING_ON_SIMULATOR() ) {
if ( (port == 14) || (port == 15) ) {
return 1;
}
else {
return 0;
}
}
else {
/* WAR: port 0xf on PIC is missing present bit */
if (XBOW_WAR_ENABLED(PV854827, xbow->xb_wid_id) &&
IS_PIC_XBOW(xbow->xb_wid_id) && port==0xf) {
return 1;
}
else if ( IS_PIC_XBOW(xbow->xb_wid_id) && port==0xb ) {
/* for opus the present bit doesn't work on port 0xb */
return 1;
}
return xbow->xb_link(port).link_aux_status & XB_AUX_STAT_PRESENT;
}
}
static int
xbow_link_alive(xbow_t * xbow, int port)
{
xbwX_stat_t xbow_linkstat;
xbow_linkstat.linkstatus = xbow->xb_link(port).link_status;
return (xbow_linkstat.link_alive);
}
/*
* xbow_widget_lookup
* Lookup the edges connected to the xbow specified, and
* retrieve the handle corresponding to the widgetnum
* specified.
* If not found, return 0.
*/
vertex_hdl_t
xbow_widget_lookup(vertex_hdl_t vhdl,
int widgetnum)
{
xswitch_info_t xswitch_info;
vertex_hdl_t conn;
xswitch_info = xswitch_info_get(vhdl);
conn = xswitch_info_vhdl_get(xswitch_info, widgetnum);
return conn;
}
/*
* xbow_setwidint: called when xtalk
* is establishing or migrating our
* interrupt service.
*/
static void
xbow_setwidint(xtalk_intr_t intr)
{
xwidgetnum_t targ = xtalk_intr_target_get(intr);
iopaddr_t addr = xtalk_intr_addr_get(intr);
xtalk_intr_vector_t vect = xtalk_intr_vector_get(intr);
xbow_t *xbow = (xbow_t *) xtalk_intr_sfarg_get(intr);
xbow_intr_preset((void *) xbow, 0, targ, addr, vect);
}
/*
* xbow_intr_preset: called during mlreset time
* if the platform specific code needs to route
* an xbow interrupt before the xtalk infrastructure
* is available for use.
*
* Also called from xbow_setwidint, so we don't
* replicate the guts of the routine.
*
* XXX- probably should be renamed xbow_wid_intr_set or
* something to reduce confusion.
*/
/*ARGSUSED3 */
void
xbow_intr_preset(void *which_widget,
int which_widget_intr,
xwidgetnum_t targ,
iopaddr_t addr,
xtalk_intr_vector_t vect)
{
xbow_t *xbow = (xbow_t *) which_widget;
xbow->xb_wid_int_upper = ((0xFF000000 & (vect << 24)) |
(0x000F0000 & (targ << 16)) |
XTALK_ADDR_TO_UPPER(addr));
xbow->xb_wid_int_lower = XTALK_ADDR_TO_LOWER(addr);
}
#define XEM_ADD_STR(s) printk("%s", (s))
#define XEM_ADD_NVAR(n,v) printk("\t%20s: 0x%llx\n", (n), ((unsigned long long)v))
#define XEM_ADD_VAR(v) XEM_ADD_NVAR(#v,(v))
#define XEM_ADD_IOEF(p,n) if (IOERROR_FIELDVALID(ioe,n)) { \
IOERROR_GETVALUE(p,ioe,n); \
XEM_ADD_NVAR("ioe." #n, p); \
}
int
xbow_xmit_retry_error(struct xbow_soft_s *soft,
int port)
{
xswitch_info_t info;
vertex_hdl_t vhdl;
widget_cfg_t *wid;
widgetreg_t id;
int part;
int mfgr;
wid = soft->wpio[port - BASE_XBOW_PORT];
if (wid == NULL) {
/* If we can't track down a PIO
* pointer to our widget yet,
* leave our caller knowing that
* we are interested in this
* interrupt if it occurs in
* the future.
*/
info = xswitch_info_get(soft->busv);
if (!info)
return 1;
vhdl = xswitch_info_vhdl_get(info, port);
if (vhdl == GRAPH_VERTEX_NONE)
return 1;
wid = (widget_cfg_t *) xtalk_piotrans_addr
(vhdl, 0, 0, sizeof *wid, 0);
if (!wid)
return 1;
soft->wpio[port - BASE_XBOW_PORT] = wid;
}
id = wid->w_id;
part = XWIDGET_PART_NUM(id);
mfgr = XWIDGET_MFG_NUM(id);
return 0;
}
/*
* xbow_errintr_handler will be called if the xbow
* sends an interrupt request to report an error.
*/
static irqreturn_t
xbow_errintr_handler(int irq, void *arg, struct pt_regs *ep)
{
ioerror_t ioe[1];
struct xbow_soft_s *soft = (struct xbow_soft_s *)arg;
xbow_t *xbow = soft->base;
xbowreg_t wid_control;
xbowreg_t wid_stat;
xbowreg_t wid_err_cmdword;
xbowreg_t wid_err_upper;
xbowreg_t wid_err_lower;
w_err_cmd_word_u wid_err;
unsigned long long wid_err_addr;
int fatal = 0;
int dump_ioe = 0;
static int xbow_error_handler(void *, int, ioerror_mode_t, ioerror_t *);
wid_control = xbow->xb_wid_control;
wid_stat = xbow->xb_wid_stat_clr;
wid_err_cmdword = xbow->xb_wid_err_cmdword;
wid_err_upper = xbow->xb_wid_err_upper;
wid_err_lower = xbow->xb_wid_err_lower;
xbow->xb_wid_err_cmdword = 0;
wid_err_addr = wid_err_lower | (((iopaddr_t) wid_err_upper & WIDGET_ERR_UPPER_ADDR_ONLY) << 32);
if (wid_stat & XB_WID_STAT_LINK_INTR_MASK) {
int port;
wid_err.r = wid_err_cmdword;
for (port = MAX_PORT_NUM - MAX_XBOW_PORTS;
port < MAX_PORT_NUM; port++) {
if (wid_stat & XB_WID_STAT_LINK_INTR(port)) {
xb_linkregs_t *link = &(xbow->xb_link(port));
xbowreg_t link_control = link->link_control;
xbowreg_t link_status = link->link_status_clr;
xbowreg_t link_aux_status = link->link_aux_status;
xbowreg_t link_pend;
link_pend = link_status & link_control &
(XB_STAT_ILLEGAL_DST_ERR
| XB_STAT_OALLOC_IBUF_ERR
| XB_STAT_RCV_CNT_OFLOW_ERR
| XB_STAT_XMT_CNT_OFLOW_ERR
| XB_STAT_XMT_MAX_RTRY_ERR
| XB_STAT_RCV_ERR
| XB_STAT_XMT_RTRY_ERR
| XB_STAT_MAXREQ_TOUT_ERR
| XB_STAT_SRC_TOUT_ERR
);
if (link_pend & XB_STAT_ILLEGAL_DST_ERR) {
if (wid_err.f.sidn == port) {
IOERROR_INIT(ioe);
IOERROR_SETVALUE(ioe, widgetnum, port);
IOERROR_SETVALUE(ioe, xtalkaddr, wid_err_addr);
if (IOERROR_HANDLED ==
xbow_error_handler(soft,
IOECODE_DMA,
MODE_DEVERROR,
ioe)) {
link_pend &= ~XB_STAT_ILLEGAL_DST_ERR;
} else {
dump_ioe++;
}
}
}
/* Xbow/Bridge WAR:
* if the bridge signals an LLP Transmitter Retry,
* rewrite its control register.
* If someone else triggers this interrupt,
* ignore (and disable) the interrupt.
*/
if (link_pend & XB_STAT_XMT_RTRY_ERR) {
if (!xbow_xmit_retry_error(soft, port)) {
link_control &= ~XB_CTRL_XMT_RTRY_IE;
link->link_control = link_control;
link->link_control; /* stall until written */
}
link_pend &= ~XB_STAT_XMT_RTRY_ERR;
}
if (link_pend) {
vertex_hdl_t xwidget_vhdl;
char *xwidget_name;
/* Get the widget name corresponding to the current
* xbow link.
*/
xwidget_vhdl = xbow_widget_lookup(soft->busv,port);
xwidget_name = xwidget_name_get(xwidget_vhdl);
printk("%s port %X[%s] XIO Bus Error",
soft->name, port, xwidget_name);
if (link_status & XB_STAT_MULTI_ERR)
XEM_ADD_STR("\tMultiple Errors\n");
if (link_status & XB_STAT_ILLEGAL_DST_ERR)
XEM_ADD_STR("\tInvalid Packet Destination\n");
if (link_status & XB_STAT_OALLOC_IBUF_ERR)
XEM_ADD_STR("\tInput Overallocation Error\n");
if (link_status & XB_STAT_RCV_CNT_OFLOW_ERR)
XEM_ADD_STR("\tLLP receive error counter overflow\n");
if (link_status & XB_STAT_XMT_CNT_OFLOW_ERR)
XEM_ADD_STR("\tLLP transmit retry counter overflow\n");
if (link_status & XB_STAT_XMT_MAX_RTRY_ERR)
XEM_ADD_STR("\tLLP Max Transmitter Retry\n");
if (link_status & XB_STAT_RCV_ERR)
XEM_ADD_STR("\tLLP Receiver error\n");
if (link_status & XB_STAT_XMT_RTRY_ERR)
XEM_ADD_STR("\tLLP Transmitter Retry\n");
if (link_status & XB_STAT_MAXREQ_TOUT_ERR)
XEM_ADD_STR("\tMaximum Request Timeout\n");
if (link_status & XB_STAT_SRC_TOUT_ERR)
XEM_ADD_STR("\tSource Timeout Error\n");
{
int other_port;
for (other_port = 8; other_port < 16; ++other_port) {
if (link_aux_status & (1 << other_port)) {
/* XXX- need to go to "other_port"
* and clean up after the timeout?
*/
XEM_ADD_VAR(other_port);
}
}
}
#if !DEBUG
if (kdebug) {
#endif
XEM_ADD_VAR(link_control);
XEM_ADD_VAR(link_status);
XEM_ADD_VAR(link_aux_status);
#if !DEBUG
}
#endif
fatal++;
}
}
}
}
if (wid_stat & wid_control & XB_WID_STAT_WIDGET0_INTR) {
/* we have a "widget zero" problem */
if (wid_stat & (XB_WID_STAT_MULTI_ERR
| XB_WID_STAT_XTALK_ERR
| XB_WID_STAT_REG_ACC_ERR)) {
printk("%s Port 0 XIO Bus Error",
soft->name);
if (wid_stat & XB_WID_STAT_MULTI_ERR)
XEM_ADD_STR("\tMultiple Error\n");
if (wid_stat & XB_WID_STAT_XTALK_ERR)
XEM_ADD_STR("\tXIO Error\n");
if (wid_stat & XB_WID_STAT_REG_ACC_ERR)
XEM_ADD_STR("\tRegister Access Error\n");
fatal++;
}
}
if (fatal) {
XEM_ADD_VAR(wid_stat);
XEM_ADD_VAR(wid_control);
XEM_ADD_VAR(wid_err_cmdword);
XEM_ADD_VAR(wid_err_upper);
XEM_ADD_VAR(wid_err_lower);
XEM_ADD_VAR(wid_err_addr);
panic("XIO Bus Error");
}
return IRQ_HANDLED;
}
/*
* XBOW ERROR Handling routines.
* These get invoked as part of walking down the error handling path
* from hub/heart towards the I/O device that caused the error.
*/
/*
* xbow_error_handler
* XBow error handling dispatch routine.
* This is the primary interface used by external world to invoke
* in case of an error related to a xbow.
* Only functionality in this layer is to identify the widget handle
* given the widgetnum. Otherwise, xbow does not gathers any error
* data.
*/
static int
xbow_error_handler(
void *einfo,
int error_code,
ioerror_mode_t mode,
ioerror_t *ioerror)
{
int retval = IOERROR_WIDGETLEVEL;
struct xbow_soft_s *soft = (struct xbow_soft_s *) einfo;
int port;
vertex_hdl_t conn;
vertex_hdl_t busv;
xbow_t *xbow = soft->base;
xbowreg_t wid_stat;
xbowreg_t wid_err_cmdword;
xbowreg_t wid_err_upper;
xbowreg_t wid_err_lower;
unsigned long long wid_err_addr;
xb_linkregs_t *link;
xbowreg_t link_control;
xbowreg_t link_status;
xbowreg_t link_aux_status;
ASSERT(soft != 0);
busv = soft->busv;
#if DEBUG && ERROR_DEBUG
printk("%s: xbow_error_handler\n", soft->name, busv);
#endif
IOERROR_GETVALUE(port, ioerror, widgetnum);
if (port == 0) {
/* error during access to xbow:
* do NOT attempt to access xbow regs.
*/
if (mode == MODE_DEVPROBE)
return IOERROR_HANDLED;
if (error_code & IOECODE_DMA) {
printk(KERN_ALERT
"DMA error blamed on Crossbow at %s\n"
"\tbut Crosbow never initiates DMA!",
soft->name);
}
if (error_code & IOECODE_PIO) {
iopaddr_t tmp;
IOERROR_GETVALUE(tmp, ioerror, xtalkaddr);
printk(KERN_ALERT "PIO Error on XIO Bus %s\n"
"\tattempting to access XIO controller\n"
"\twith offset 0x%lx",
soft->name, tmp);
}
/* caller will dump contents of ioerror
* in DEBUG and kdebug kernels.
*/
return retval;
}
/*
* error not on port zero:
* safe to read xbow registers.
*/
wid_stat = xbow->xb_wid_stat;
wid_err_cmdword = xbow->xb_wid_err_cmdword;
wid_err_upper = xbow->xb_wid_err_upper;
wid_err_lower = xbow->xb_wid_err_lower;
wid_err_addr =
wid_err_lower
| (((iopaddr_t) wid_err_upper
& WIDGET_ERR_UPPER_ADDR_ONLY)
<< 32);
if ((port < BASE_XBOW_PORT) ||
(port >= MAX_PORT_NUM)) {
if (mode == MODE_DEVPROBE)
return IOERROR_HANDLED;
if (error_code & IOECODE_DMA) {
printk(KERN_ALERT
"DMA error blamed on XIO port at %s/%d\n"
"\tbut Crossbow does not support that port",
soft->name, port);
}
if (error_code & IOECODE_PIO) {
iopaddr_t tmp;
IOERROR_GETVALUE(tmp, ioerror, xtalkaddr);
printk(KERN_ALERT
"PIO Error on XIO Bus %s\n"
"\tattempting to access XIO port %d\n"
"\t(which Crossbow does not support)"
"\twith offset 0x%lx",
soft->name, port, tmp);
}
#if !DEBUG
if (kdebug) {
#endif
XEM_ADD_STR("Raw status values for Crossbow:\n");
XEM_ADD_VAR(wid_stat);
XEM_ADD_VAR(wid_err_cmdword);
XEM_ADD_VAR(wid_err_upper);
XEM_ADD_VAR(wid_err_lower);
XEM_ADD_VAR(wid_err_addr);
#if !DEBUG
}
#endif
/* caller will dump contents of ioerror
* in DEBUG and kdebug kernels.
*/
return retval;
}
/* access to valid port:
* ok to check port status.
*/
link = &(xbow->xb_link(port));
link_control = link->link_control;
link_status = link->link_status;
link_aux_status = link->link_aux_status;
/* Check that there is something present
* in that XIO port.
*/
/* WAR: PIC widget 0xf is missing prescense bit */
if (XBOW_WAR_ENABLED(PV854827, xbow->xb_wid_id) &&
IS_PIC_XBOW(xbow->xb_wid_id) && (port==0xf))
;
else if (IS_PIC_XBOW(xbow->xb_wid_id) && (port==0xb))
; /* WAR for opus this is missing on 0xb */
else if (!(link_aux_status & XB_AUX_STAT_PRESENT)) {
/* nobody connected. */
if (mode == MODE_DEVPROBE)
return IOERROR_HANDLED;
if (error_code & IOECODE_DMA) {
printk(KERN_ALERT
"DMA error blamed on XIO port at %s/%d\n"
"\tbut there is no device connected there.",
soft->name, port);
}
if (error_code & IOECODE_PIO) {
iopaddr_t tmp;
IOERROR_GETVALUE(tmp, ioerror, xtalkaddr);
printk(KERN_ALERT
"PIO Error on XIO Bus %s\n"
"\tattempting to access XIO port %d\n"
"\t(which has no device connected)"
"\twith offset 0x%lx",
soft->name, port, tmp);
}
#if !DEBUG
if (kdebug) {
#endif
XEM_ADD_STR("Raw status values for Crossbow:\n");
XEM_ADD_VAR(wid_stat);
XEM_ADD_VAR(wid_err_cmdword);
XEM_ADD_VAR(wid_err_upper);
XEM_ADD_VAR(wid_err_lower);
XEM_ADD_VAR(wid_err_addr);
XEM_ADD_VAR(port);
XEM_ADD_VAR(link_control);
XEM_ADD_VAR(link_status);
XEM_ADD_VAR(link_aux_status);
#if !DEBUG
}
#endif
return retval;
}
/* Check that the link is alive.
*/
if (!(link_status & XB_STAT_LINKALIVE)) {
iopaddr_t tmp;
/* nobody connected. */
if (mode == MODE_DEVPROBE)
return IOERROR_HANDLED;
printk(KERN_ALERT
"%s%sError on XIO Bus %s port %d",
(error_code & IOECODE_DMA) ? "DMA " : "",
(error_code & IOECODE_PIO) ? "PIO " : "",
soft->name, port);
IOERROR_GETVALUE(tmp, ioerror, xtalkaddr);
if ((error_code & IOECODE_PIO) &&
(IOERROR_FIELDVALID(ioerror, xtalkaddr))) {
printk("\tAccess attempted to offset 0x%lx\n", tmp);
}
if (link_aux_status & XB_AUX_LINKFAIL_RST_BAD)
XEM_ADD_STR("\tLink never came out of reset\n");
else
XEM_ADD_STR("\tLink failed while transferring data\n");
}
/* get the connection point for the widget
* involved in this error; if it exists and
* is not our connectpoint, cycle back through
* xtalk_error_handler to deliver control to
* the proper handler (or to report a generic
* crosstalk error).
*
* If the downstream handler won't handle
* the problem, we let our upstream caller
* deal with it, after (in DEBUG and kdebug
* kernels) dumping the xbow state for this
* port.
*/
conn = xbow_widget_lookup(busv, port);
if ((conn != GRAPH_VERTEX_NONE) &&
(conn != soft->conn)) {
retval = xtalk_error_handler(conn, error_code, mode, ioerror);
if (retval == IOERROR_HANDLED)
return IOERROR_HANDLED;
}
if (mode == MODE_DEVPROBE)
return IOERROR_HANDLED;
if (retval == IOERROR_UNHANDLED) {
iopaddr_t tmp;
retval = IOERROR_PANIC;
printk(KERN_ALERT
"%s%sError on XIO Bus %s port %d",
(error_code & IOECODE_DMA) ? "DMA " : "",
(error_code & IOECODE_PIO) ? "PIO " : "",
soft->name, port);
IOERROR_GETVALUE(tmp, ioerror, xtalkaddr);
if ((error_code & IOECODE_PIO) &&
(IOERROR_FIELDVALID(ioerror, xtalkaddr))) {
printk("\tAccess attempted to offset 0x%lx\n", tmp);
}
}
#if !DEBUG
if (kdebug) {
#endif
XEM_ADD_STR("Raw status values for Crossbow:\n");
XEM_ADD_VAR(wid_stat);
XEM_ADD_VAR(wid_err_cmdword);
XEM_ADD_VAR(wid_err_upper);
XEM_ADD_VAR(wid_err_lower);
XEM_ADD_VAR(wid_err_addr);
XEM_ADD_VAR(port);
XEM_ADD_VAR(link_control);
XEM_ADD_VAR(link_status);
XEM_ADD_VAR(link_aux_status);
#if !DEBUG
}
#endif
/* caller will dump raw ioerror data
* in DEBUG and kdebug kernels.
*/
return retval;
}
int
xbow_reset_link(vertex_hdl_t xconn_vhdl)
{
xwidget_info_t widget_info;
xwidgetnum_t port;
xbow_t *xbow;
xbowreg_t ctrl;
xbwX_stat_t stat;
unsigned long itick;
unsigned int dtick;
static long ticks_to_wait = HZ / 1000;
widget_info = xwidget_info_get(xconn_vhdl);
port = xwidget_info_id_get(widget_info);
#ifdef XBOW_K1PTR /* defined if we only have one xbow ... */
xbow = XBOW_K1PTR;
#else
{
vertex_hdl_t xbow_vhdl;
struct xbow_soft_s *xbow_soft;
hwgraph_traverse(xconn_vhdl, ".master/xtalk/0/xbow", &xbow_vhdl);
xbow_soft = xbow_soft_get(xbow_vhdl);
xbow = xbow_soft->base;
}
#endif
/*
* This requires three PIOs (reset the link, check for the
* reset, restore the control register for the link) plus
* 10us to wait for the reset. We allow up to 1ms for the
* widget to come out of reset before giving up and
* returning a failure.
*/
ctrl = xbow->xb_link(port).link_control;
xbow->xb_link(port).link_reset = 0;
itick = jiffies;
while (1) {
stat.linkstatus = xbow->xb_link(port).link_status;
if (stat.link_alive)
break;
dtick = jiffies - itick;
if (dtick > ticks_to_wait) {
return -1; /* never came out of reset */
}
udelay(2); /* don't beat on link_status */
}
xbow->xb_link(port).link_control = ctrl;
return 0;
}
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