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Workaround some EB164 wierdness.

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Obtained from: NetBSD
This commit is contained in:
Doug Rabson 1998-09-16 08:24:30 +00:00
parent f9f51c39c3
commit 7f323059fa
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=39343
1 changed files with 75 additions and 13 deletions
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88
sys/alpha/pci/cia.c
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@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: cia.c,v 1.7 1998/08/11 08:51:09 dfr Exp $
* $Id: cia.c,v 1.8 1998/08/13 08:11:27 dfr Exp $
*/
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -271,6 +271,46 @@ cia_bwx_maxdevs(u_int b)
return 12; /* XXX */
}
static void
cia_clear_abort(void)
{
/*
* Some (apparently-common) revisions of EB164 and AlphaStation
* firmware do the Wrong thing with PCI master and target aborts,
* which are caused by accesing the configuration space of devices
* that don't exist (for example).
*
* To work around this, we clear the CIA error register's PCI
* master and target abort bits before touching PCI configuration
* space and check it afterwards. If it indicates a master or target
* abort, the device wasn't there so we return 0xffffffff.
*/
REGVAL(CIA_CSR_CIA_ERR) = CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT;
alpha_mb();
alpha_pal_draina();
}
static int
cia_check_abort(void)
{
u_int32_t errbits;
int ba = 0;
alpha_pal_draina();
alpha_mb();
errbits = REGVAL(CIA_CSR_CIA_ERR);
if (errbits & (CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT))
ba = 1;
if (errbits) {
REGVAL(CIA_CSR_CIA_ERR) = errbits;
alpha_mb();
alpha_pal_draina();
}
return ba;
}
#define CIA_BWX_CFGADDR(b, s, f, r) \
KV(((b) ? CIA_EV56_BWCONF1 : CIA_EV56_BWCONF0) \
| ((b) << 16) | ((s) << 11) | ((f) << 8) | (r))
@ -279,36 +319,58 @@ static u_int8_t
cia_bwx_cfgreadb(u_int b, u_int s, u_int f, u_int r)
{
vm_offset_t va = CIA_BWX_CFGADDR(b, s, f, r);
alpha_mb();
if (badaddr((caddr_t)va, 1)) return ~0;
return ldbu(va+BWX_EV56_INT1);
u_int8_t data;
cia_clear_abort();
if (badaddr((caddr_t)va, 1)) {
cia_check_abort();
return ~0;
}
data = ldbu(va+BWX_EV56_INT1);
if (cia_check_abort())
return ~0;
return data;
}
static u_int16_t
cia_bwx_cfgreadw(u_int b, u_int s, u_int f, u_int r)
{
vm_offset_t va = CIA_BWX_CFGADDR(b, s, f, r);
alpha_mb();
if (badaddr((caddr_t)va, 2)) return ~0;
return ldwu(va+BWX_EV56_INT2);
u_int16_t data;
cia_clear_abort();
if (badaddr((caddr_t)va, 2)) {
cia_check_abort();
return ~0;
}
data = ldwu(va+BWX_EV56_INT2);
if (cia_check_abort())
return ~0;
return data;
}
static u_int32_t
cia_bwx_cfgreadl(u_int b, u_int s, u_int f, u_int r)
{
vm_offset_t va = CIA_BWX_CFGADDR(b, s, f, r);
alpha_mb();
if (badaddr((caddr_t)va, 4)) return ~0;
return ldl(va+BWX_EV56_INT4);
u_int32_t data;
cia_clear_abort();
if (badaddr((caddr_t)va, 4)) {
cia_check_abort();
return ~0;
}
data = ldl(va+BWX_EV56_INT4);
if (cia_check_abort())
return ~0;
return data;
}
static void
cia_bwx_cfgwriteb(u_int b, u_int s, u_int f, u_int r, u_int8_t data)
{
vm_offset_t va = CIA_BWX_CFGADDR(b, s, f, r);
cia_clear_abort();
if (badaddr((caddr_t)va, 1)) return;
stb(va+BWX_EV56_INT1, data);
alpha_wmb();
cia_check_abort();
}
static void
@ -317,7 +379,7 @@ cia_bwx_cfgwritew(u_int b, u_int s, u_int f, u_int r, u_int16_t data)
vm_offset_t va = CIA_BWX_CFGADDR(b, s, f, r);
if (badaddr((caddr_t)va, 2)) return;
stw(va+BWX_EV56_INT2, data);
alpha_wmb();
cia_check_abort();
}
static void
@ -326,7 +388,7 @@ cia_bwx_cfgwritel(u_int b, u_int s, u_int f, u_int r, u_int32_t data)
vm_offset_t va = CIA_BWX_CFGADDR(b, s, f, r);
if (badaddr((caddr_t)va, 4)) return;
stl(va+BWX_EV56_INT4, data);
alpha_wmb();
cia_check_abort();
}
static u_int8_t