Date: Mon, 08 May 2000 14:31:27 -0600 From: Warner Losh <imp@village.org> To: Duncan Barclay <dmlb@ragnet.demon.co.uk> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Getting an aligned IO port Message-ID: <200005082031.OAA79569@harmony.village.org> In-Reply-To: Your message of "Mon, 08 May 2000 18:31:32 BST." <XFMail.000508183132.dmlb@computer.my.domain> References: <XFMail.000508183132.dmlb@computer.my.domain>
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In message <XFMail.000508183132.dmlb@computer.my.domain> Duncan Barclay writes:
: How can get a 16byte aligned ISA IO port from the resource allocator? I need
: this to get if_xe working for Realport cards.
:
: This aspect of the driver is nothing to do with Warner's changes to PCCard.
I'm going to have to commit the byte alignment stuff that was posted a
while ago committed.
Until then, you request 16 bytes from the system for the ioports.
Since this is pccard, you'll likely want to map it in the 0x100 -
0x3ff range:
start = 0x100;
end = 0x3ff;
rid = 1; /* 0 is managed by pccardd */
do {
res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, start,
end, 16, RF_ACTIVE);
if (res == 0)
break; /* we failed */
if ((rman_get_start(res) & 0xf) == 0)
break; /* good */
start = (rman_get_start(res) + 15) & ~0xf;
} while (1);
Warner
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