FreeBSD-5.3/sys/alpha/pci/t2.c
/*
* Copyright (c) 2000 Andrew Gallatin & Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Portions of this file were obtained from Compaq intellectual
* property which was made available under the following copyright:
*
* *****************************************************************
* * *
* * Copyright Compaq Computer Corporation, 2000 *
* * *
* * Permission to use, copy, modify, distribute, and sell *
* * this software and its documentation for any purpose is *
* * hereby granted without fee, provided that the above *
* * copyright notice appear in all copies and that both *
* * that copyright notice and this permission notice appear *
* * in supporting documentation, and that the name of *
* * Compaq Computer Corporation not be used in advertising *
* * or publicity pertaining to distribution of the software *
* * without specific, written prior permission. Compaq *
* * makes no representations about the suitability of this *
* * software for any purpose. It is provided "AS IS" *
* * without express or implied warranty. *
* * *
* *****************************************************************
*/
/*
* T2 CBUS to PCI bridge
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/alpha/pci/t2.c,v 1.21 2004/07/01 15:07:27 gallatin Exp $");
#define __RMAN_RESOURCE_VISIBLE
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/proc.h>
#include <sys/rman.h>
#include <sys/interrupt.h>
#include <dev/pci/pcivar.h>
#include <alpha/pci/t2reg.h>
#include <alpha/pci/t2var.h>
#include <alpha/isa/isavar.h>
#include <machine/cpuconf.h>
#include <machine/intr.h>
#include <machine/intrcnt.h>
#include <machine/md_var.h>
#include <machine/resource.h>
#include <machine/sgmap.h>
#include <machine/swiz.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#define KV(pa) ALPHA_PHYS_TO_K0SEG(pa + sable_lynx_base)
vm_offset_t sable_lynx_base = 0UL;
volatile t2_csr_t *t2_csr[2];
static int pci_int_type[2];
static devclass_t t2_devclass;
static device_t t2_0; /* XXX only one for now */
struct t2_softc {
int junk;
};
#define T2_SOFTC(dev) (struct t2_softc*) device_get_softc(dev)
static alpha_chipset_read_hae_t t2_read_hae;
static alpha_chipset_write_hae_t t2_write_hae;
static alpha_chipset_t t2_chipset = {
t2_read_hae,
t2_write_hae,
};
static u_int32_t t2_hae_mem[2];
#define REG1 (1UL << 24)
static u_int32_t
t2_set_hae_mem(void *arg, u_int32_t pa)
{
register_t s;
u_int32_t msb;
int hose;
hose = (long)arg;
if(pa >= REG1){
msb = pa & 0xf8000000;
pa -= msb;
msb >>= 27; /* t2 puts high bits in the bottom of the register */
s = intr_disable();
if (msb != t2_hae_mem[hose]) {
t2_hae_mem[hose] = msb;
t2_csr[hose]->hae0_1 = t2_hae_mem[hose];
alpha_mb();
t2_hae_mem[hose] = t2_csr[hose]->hae0_1;
}
intr_restore(s);
}
return pa;
}
static u_int64_t
t2_read_hae(void)
{
return t2_hae_mem[0] << 27;
}
static void
t2_write_hae(u_int64_t hae)
{
u_int32_t pa = hae;
t2_set_hae_mem(0, pa);
}
static int t2_probe(device_t dev);
static int t2_attach(device_t dev);
static int t2_setup_intr(device_t dev, device_t child,
struct resource *irq, int flags,
void *intr, void *arg, void **cookiep);
static int t2_teardown_intr(device_t dev, device_t child,
struct resource *irq, void *cookie);
static void
t2_dispatch_intr(void *frame, unsigned long vector);
static void
t2_machine_check(unsigned long mces, struct trapframe *framep,
unsigned long vector, unsigned long param);
static device_method_t t2_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, t2_probe),
DEVMETHOD(device_attach, t2_attach),
/* Bus interface */
DEVMETHOD(bus_setup_intr, t2_setup_intr),
DEVMETHOD(bus_teardown_intr, t2_teardown_intr),
{ 0, 0 }
};
static driver_t t2_driver = {
"t2",
t2_methods,
sizeof(struct t2_softc),
};
#define T2_SGMAP_BASE (8*1024*1024)
#define T2_SGMAP_SIZE (8*1024*1024)
static void
t2_sgmap_invalidate(void)
{
u_int64_t val;
alpha_mb();
val = REGVAL64(T2_IOCSR);
val |= T2_IOCSRL_ITLB;
REGVAL64(T2_IOCSR) = val;
alpha_mb();
alpha_mb();
val = REGVAL64(T2_IOCSR);
val &= ~T2_IOCSRL_ITLB;
REGVAL64(T2_IOCSR) = val;
alpha_mb();
alpha_mb();
}
static void
t2_sgmap_map(void *arg, bus_addr_t ba, vm_offset_t pa)
{
u_int64_t *sgtable = arg;
int index = alpha_btop(ba - T2_SGMAP_BASE);
if (pa) {
if (pa > (1L<<32))
panic("t2_sgmap_map: can't map address 0x%lx", pa);
sgtable[index] = ((pa >> 13) << 1) | 1;
} else {
sgtable[index] = 0;
}
alpha_mb();
t2_sgmap_invalidate();
}
static void
t2_init_sgmap(int h)
{
void *sgtable;
/*
* First setup Window 2 to map 8Mb to 16Mb with an
* sgmap. Allocate the map aligned to a 32 boundary.
*
* bits 31..20 of WBASE represent the pci start address
* (in units of 1Mb), and bits 11..0 represent the pci
* end address
*/
t2_csr[h]->wbase2 = T2_WSIZE_8M|T2_WINDOW_ENABLE|T2_WINDOW_SG
| ((T2_SGMAP_BASE >> 20) << 20)
| ((T2_SGMAP_BASE + T2_SGMAP_SIZE) >> 20);
t2_csr[h]->wmask2 = T2_WMASK_8M;
alpha_mb();
sgtable = contigmalloc(8192, M_DEVBUF, M_NOWAIT,
0, (1L<<34),
32*1024, (1L<<34));
if (!sgtable)
panic("t2_init_sgmap: can't allocate page table");
t2_csr[h]->tbase2 =
(pmap_kextract((vm_offset_t) sgtable) >> T2_TBASE_SHIFT);
chipset.sgmap = sgmap_map_create(T2_SGMAP_BASE,
T2_SGMAP_BASE + T2_SGMAP_SIZE,
t2_sgmap_map, sgtable);
}
static void
t2_csr_init(int h)
{
/*
* initialize the DMA windows
*/
t2_csr[h]->wbase1 = T2_WSIZE_1G|T2_WINDOW_ENABLE|T2_WINDOW_DIRECT|0x7ff;
t2_csr[h]->wmask1 = T2_WMASK_1G;
t2_csr[h]->tbase1 = 0x0;
t2_csr[h]->wbase2 = 0x0;
/*
* enable the PCI "Hole" for ISA devices which use memory in
* the 512k - 1MB range
*/
t2_csr[h]->hbase = 1 << 13;
t2_init_sgmap(0);
/* initialize the HAEs */
t2_csr[h]->hae0_1 = 0x0;
alpha_mb();
t2_csr[h]->hae0_2 = 0x0;
alpha_mb();
t2_csr[h]->hae0_3 = 0x0;
alpha_mb();
}
/*
* Perform basic chipset init/fixup. Called by various early
* consumers to ensure that the system will work before the
* bus methods are invoked.
*
*/
void
t2_init()
{
static int initted = 0;
static struct swiz_space io_space, mem_space;
if (initted) return;
initted = 1;
swiz_init_space(&io_space, KV(T2_PCI_SIO));
swiz_init_space_hae(&mem_space, KV(T2_PCI_SPARSE),
t2_set_hae_mem, 0);
busspace_isa_io = (struct alpha_busspace *) &io_space;
busspace_isa_mem = (struct alpha_busspace *) &mem_space;
chipset = t2_chipset;
}
static int
t2_probe(device_t dev)
{
int h, t2_num_hoses = 1;
device_t child;
if (t2_0)
return ENXIO;
t2_0 = dev;
device_set_desc(dev, "T2 Core Logic chipset");
t2_csr[0] = (t2_csr_t *)
ALPHA_PHYS_TO_K0SEG(sable_lynx_base + PCI0_BASE);
t2_csr[1] = (t2_csr_t *)
ALPHA_PHYS_TO_K0SEG(sable_lynx_base + PCI1_BASE);
/* Look at the rev of the chip. If the high bit is set in the
* rev field then we have either a T3 or a T4 chip, so use the
* new interrupt structure. If it is clear, then we have a T2
* so use the old way */
platform.mcheck_handler = t2_machine_check;
if (((t2_csr[0]->iocsr) >> 35) & 1)
pci_int_type[0] = 1;
else
pci_int_type[0] = 0;
device_printf(dev, "using interrupt type %d on pci bus 0\n",
pci_int_type[0]);
if (!badaddr(__DEVOLATILE(void *, &t2_csr[1]->tlbbr), sizeof(long))) {
pci_int_type[1] = 1; /* PCI1 always uses the new scheme */
/* Clear any errors that the BADADDR probe may have caused */
t2_csr[1]->cerr1 |= t2_csr[1]->cerr1;
t2_csr[1]->pcierr1 |= t2_csr[1]->pcierr1;
device_printf(dev, "found EXT_IO!!!!!\n");
/* t2_num_hoses = 2; XXX not ready for this yet */
}
for (h = 0; h < t2_num_hoses; h++)
t2_csr_init(h);
child = device_add_child(dev, "pcib", 0);
device_set_ivars(child, 0);
return 0;
}
static int
t2_attach(device_t dev)
{
t2_init();
set_iointr(t2_dispatch_intr);
platform.isa_setup_intr = t2_setup_intr;
platform.isa_teardown_intr = t2_teardown_intr;
snprintf(chipset_type, sizeof(chipset_type), "t2");
bus_generic_attach(dev);
return 0;
}
/*
* magical mystery table partly obtained from Linux
* at least some of their values for PCI masks
* were incorrect, and I've filled in my own extrapolations
* XXX this needs more testers
*/
unsigned long t2_shadow_mask = -1L;
static const char irq_to_mask[40] = {
-1, 6, -1, 8, 15, 12, 7, 9, /* ISA 0-7 */
-1, 16, 17, 18, 3, -1, 21, 22, /* ISA 8-15 */
-1, -1, -1, -1, -1, -1, -1, -1, /* ?? EISA XXX */
-1, -1, -1, -1, -1, -1, -1, -1, /* ?? EISA XXX */
0, 1, 2, 3, 4, 5, 6, 7 /* PCI 0-7 XXX */
};
static void
t2_8259_disable_mask(int mask)
{
t2_shadow_mask |= (1UL << mask);
if (mask <= 7)
outb(SLAVE0_ICU, t2_shadow_mask);
else if (mask <= 15)
outb(SLAVE1_ICU, t2_shadow_mask >> 8);
else
outb(SLAVE2_ICU, t2_shadow_mask >> 16);
}
static void
t2_8259_enable_mask(int mask)
{
t2_shadow_mask &= ~(1UL << mask);
if (mask <= 7)
outb(SLAVE0_ICU, t2_shadow_mask);
else if (mask <= 15)
outb(SLAVE1_ICU, t2_shadow_mask >> 8);
else
outb(SLAVE2_ICU, t2_shadow_mask >> 16);
}
static void
t2_eoi( int vector)
{
int irq, hose;
hose = (vector >= 0xC00);
irq = (vector - 0x800) >> 4;
if (pci_int_type[hose]) {
/* New interrupt scheme. Both PCI0 and PCI1 can use
* the same handler. Dispatching interrupts with the
* IC IC chip is easy. We simply write the vector
* address register (var) on the T3/T4 (offset
* 0x480) with the IRQ level (0 - 63) of what came in. */
t2_csr[hose]->var = (u_long) irq;
alpha_mb();
alpha_mb();
} else {
switch (irq) {
case 0 ... 7:
outb(SLAVE0_ICU-1, (0xe0 | (irq)));
outb(MASTER_ICU-1, (0xe0 | 1));
break;
case 8 ... 15:
outb(SLAVE1_ICU-1, (0xe0 | (irq - 8)));
outb(MASTER_ICU-1, (0xe0 | 3));
break;
case 16 ... 24:
outb(SLAVE2_ICU-1, (0xe0 | (irq - 16)));
outb(MASTER_ICU-1, (0xe0 | 4));
break;
}
}
}
static void
t2_enable_vec(uintptr_t vector)
{
int irq, hose;
u_long IC_mask, scratch;
hose = (vector >= 0xC00);
irq = (vector - 0x800) >> 4;
mtx_lock_spin(&icu_lock);
if (pci_int_type[hose]) {
/* Write the air register on the T3/T4 with the
* address of the IC IC masks register (offset 0x40) */
t2_csr[hose]->air = 0x40;
alpha_mb();
scratch = t2_csr[hose]->air;
alpha_mb();
IC_mask = t2_csr[hose]->dir;
IC_mask &= ~(1L << ( (u_long) irq));
t2_csr[hose]->dir = IC_mask;
alpha_mb();
alpha_mb();
/*
* EOI the interrupt we just enabled.
*/
t2_eoi(vector);
} else {
/* Old style 8259 (Gack!!!) interrupts */
t2_8259_enable_mask(irq);
}
mtx_unlock_spin(&icu_lock);
}
static void
t2_disable_vec(uintptr_t vector)
{
int hose, irq;
u_long scratch, IC_mask;
hose = (vector >= 0xC00);
irq = (vector - 0x800) >> 4;
mtx_lock_spin(&icu_lock);
if (pci_int_type[hose]) {
/* Write the air register on the T3/T4 wioth the
* address of the IC IC masks register (offset 0x40) */
t2_csr[hose]->air = 0x40;
alpha_mb();
scratch = t2_csr[hose]->air;
alpha_mb();
/*
* Read the dir register to fetch the mask data, 'or' in the
* new disable bit, and write the data back.
*/
IC_mask = t2_csr[hose]->dir;
IC_mask |= (1L << ( (u_long) irq));
/* Set the disable bit */
t2_csr[hose]->dir = IC_mask;
alpha_mb();
alpha_mb();
} else {
/* Old style 8259 (Gack!!!) interrupts */
t2_8259_disable_mask(irq);
}
mtx_unlock_spin(&icu_lock);
}
static int
t2_setup_intr(device_t dev, device_t child,
struct resource *irq, int flags,
void *intr, void *arg, void **cookiep)
{
int error, vector, stdio_irq;
const char *name;
device_t bus, parent;
name = device_get_nameunit(dev);
stdio_irq = irq->r_start;
if (strncmp(name, "eisa", 4) == 0) {
if ((stdio_irq != 6 ) && (stdio_irq != 3 )) {
stdio_irq =
T2_EISA_IRQ_TO_STDIO_IRQ(stdio_irq);
}
} else if ((strncmp(name, "isa", 3)) == 0) {
stdio_irq = irq_to_mask[stdio_irq];
}
parent = dev;
do {
bus = parent;
parent = device_get_parent(bus);
} while (parent && strncmp("t2", device_get_nameunit(parent), 2));
if (parent && (device_get_unit(bus) != 0))
vector = STDIO_PCI1_IRQ_TO_SCB_VECTOR(stdio_irq);
else
vector = STDIO_PCI0_IRQ_TO_SCB_VECTOR(stdio_irq);
error = rman_activate_resource(irq);
if (error)
return error;
error = alpha_setup_intr(device_get_nameunit(child ? child : dev),
vector, intr, arg, flags, cookiep,
&intrcnt[irq->r_start], t2_disable_vec, t2_enable_vec);
if (error)
return error;
/* Enable interrupt */
t2_enable_vec(vector);
if (bootverbose != 0)
device_printf(child,
"interrupting at T2 irq %d (stdio irq %d)\n",
(int) irq->r_start, stdio_irq);
return 0;
}
static int
t2_teardown_intr(device_t dev, device_t child,
struct resource *irq, void *cookie)
{
int mask;
mask = irq_to_mask[irq->r_start];
/* Disable interrupt */
/*
* XXX this is totally broken!
* we don't have enough info to figure out where the interrupt
* came from if hose != 0 and pci_int_type[hose] != 0
* We should probably carry around the vector someplace --
* that would be enough to figure out the hose and the stdio irq
*/
t2_shadow_mask |= (1UL << mask);
mtx_lock_spin(&icu_lock);
if (mask <= 7)
outb(SLAVE0_ICU, t2_shadow_mask);
else if (mask <= 15)
outb(SLAVE1_ICU, t2_shadow_mask >> 8);
else
outb(SLAVE2_ICU, t2_shadow_mask >> 16);
mtx_unlock_spin(&icu_lock);
alpha_teardown_intr(cookie);
return rman_deactivate_resource(irq);
}
static void
t2_dispatch_intr(void *frame, unsigned long vector)
{
alpha_dispatch_intr(frame, vector);
mtx_lock_spin(&icu_lock);
t2_eoi(vector);
mtx_unlock_spin(&icu_lock);
}
static void
t2_machine_check(unsigned long mces, struct trapframe *framep,
unsigned long vector, unsigned long param)
{
int expected;
expected = mc_expected;
machine_check(mces, framep, vector, param);
/* for some reason the alpha_pal_wrmces() doesn't clear all
pending machine checks & we may take another */
mc_expected = expected;
}
DRIVER_MODULE(t2, root, t2_driver, t2_devclass, 0, 0);