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/*
* Copyright © 2008 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
* Ben Widawsky <ben@bwidawsk.net>
*
*/
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <err.h>
#include <assert.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "intel_io.h"
#include "igt_debugfs.h"
#include "intel_chipset.h"
#define FAKEKEY 0x2468ace0
void *mmio;
static struct _mmio_data {
int inited;
bool safe;
uint32_t i915_devid;
struct intel_register_map map;
int key;
} mmio_data;
void
intel_mmio_use_dump_file(char *file)
{
int fd;
struct stat st;
fd = open(file, O_RDWR);
if (fd == -1) {
fprintf(stderr, "Couldn't open %s: %s\n", file,
strerror(errno));
exit(1);
}
fstat(fd, &st);
mmio = mmap(NULL, st.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
if (mmio == MAP_FAILED) {
fprintf(stderr, "Couldn't mmap %s: %s\n", file,
strerror(errno));
exit(1);
}
close(fd);
}
void
intel_mmio_use_pci_bar(struct pci_device *pci_dev)
{
uint32_t devid, gen;
int mmio_bar, mmio_size;
int error;
devid = pci_dev->device_id;
if (IS_GEN2(devid))
mmio_bar = 1;
else
mmio_bar = 0;
gen = intel_gen(devid);
if (gen < 3)
mmio_size = 512*1024;
else if (gen < 5)
mmio_size = 512*1024;
else
mmio_size = 2*1024*1024;
error = pci_device_map_range (pci_dev,
pci_dev->regions[mmio_bar].base_addr,
mmio_size,
PCI_DEV_MAP_FLAG_WRITABLE,
&mmio);
if (error != 0) {
fprintf(stderr, "Couldn't map MMIO region: %s\n",
strerror(error));
exit(1);
}
}
static void
release_forcewake_lock(int fd)
{
close(fd);
}
/*
* Initialize register access library.
*
* @pci_dev: pci device we're mucking with
* @safe: use safe register access tables
*/
int
intel_register_access_init(struct pci_device *pci_dev, int safe)
{
int ret;
/* after old API is deprecated, remove this */
if (mmio == NULL)
intel_mmio_use_pci_bar(pci_dev);
assert(mmio != NULL);
if (mmio_data.inited)
return -1;
mmio_data.safe = (safe != 0 &&
intel_gen(pci_dev->device_id) >= 4) ? true : false;
mmio_data.i915_devid = pci_dev->device_id;
if (mmio_data.safe)
mmio_data.map = intel_get_register_map(mmio_data.i915_devid);
/* Find where the forcewake lock is. Forcewake doesn't exist
* gen < 6, but the debugfs should do the right things for us.
*/
ret = igt_open_forcewake_handle();
if (ret == -1)
mmio_data.key = FAKEKEY;
else
mmio_data.key = ret;
mmio_data.inited++;
return 0;
}
static int
intel_register_access_needs_wake(void)
{
return mmio_data.key != FAKEKEY;
}
int intel_register_access_needs_fakewake(void)
{
return mmio_data.key == FAKEKEY;
}
void
intel_register_access_fini(void)
{
if (mmio_data.key && intel_register_access_needs_wake())
release_forcewake_lock(mmio_data.key);
mmio_data.inited--;
}
uint32_t
intel_register_read(uint32_t reg)
{
struct intel_register_range *range;
uint32_t ret;
assert(mmio_data.inited);
if (intel_gen(mmio_data.i915_devid) >= 6)
assert(mmio_data.key != -1);
if (!mmio_data.safe)
goto read_out;
range = intel_get_register_range(mmio_data.map,
reg,
INTEL_RANGE_READ);
if(!range) {
fprintf(stderr, "Register read blocked for safety "
"(*0x%08x)\n", reg);
ret = 0xffffffff;
goto out;
}
read_out:
ret = *(volatile uint32_t *)((volatile char *)mmio + reg);
out:
return ret;
}
void
intel_register_write(uint32_t reg, uint32_t val)
{
struct intel_register_range *range;
assert(mmio_data.inited);
if (intel_gen(mmio_data.i915_devid) >= 6)
assert(mmio_data.key != -1);
if (!mmio_data.safe)
goto write_out;
range = intel_get_register_range(mmio_data.map,
reg,
INTEL_RANGE_WRITE);
if (!range) {
fprintf(stderr, "Register write blocked for safety "
"(*0x%08x = 0x%x)\n", reg, val);
}
write_out:
*(volatile uint32_t *)((volatile char *)mmio + reg) = val;
}
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