mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 12:46:39 +07:00
5f217f905b
Complete missing parameters, correct wrong reference, and add an explaination about the differences between the latest specification and our implementation. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
405 lines
9.4 KiB
C
405 lines
9.4 KiB
C
/*
|
|
* Connection Management Procedures (IEC 61883-1) helper functions
|
|
*
|
|
* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
|
|
* Licensed under the terms of the GNU General Public License, version 2.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/firewire.h>
|
|
#include <linux/firewire-constants.h>
|
|
#include <linux/module.h>
|
|
#include <linux/sched.h>
|
|
#include "lib.h"
|
|
#include "iso-resources.h"
|
|
#include "cmp.h"
|
|
|
|
/* MPR common fields */
|
|
#define MPR_SPEED_MASK 0xc0000000
|
|
#define MPR_SPEED_SHIFT 30
|
|
#define MPR_XSPEED_MASK 0x00000060
|
|
#define MPR_XSPEED_SHIFT 5
|
|
#define MPR_PLUGS_MASK 0x0000001f
|
|
|
|
/* PCR common fields */
|
|
#define PCR_ONLINE 0x80000000
|
|
#define PCR_BCAST_CONN 0x40000000
|
|
#define PCR_P2P_CONN_MASK 0x3f000000
|
|
#define PCR_P2P_CONN_SHIFT 24
|
|
#define PCR_CHANNEL_MASK 0x003f0000
|
|
#define PCR_CHANNEL_SHIFT 16
|
|
|
|
/* oPCR specific fields */
|
|
#define OPCR_XSPEED_MASK 0x00C00000
|
|
#define OPCR_XSPEED_SHIFT 22
|
|
#define OPCR_SPEED_MASK 0x0000C000
|
|
#define OPCR_SPEED_SHIFT 14
|
|
#define OPCR_OVERHEAD_ID_MASK 0x00003C00
|
|
#define OPCR_OVERHEAD_ID_SHIFT 10
|
|
|
|
enum bus_reset_handling {
|
|
ABORT_ON_BUS_RESET,
|
|
SUCCEED_ON_BUS_RESET,
|
|
};
|
|
|
|
static __printf(2, 3)
|
|
void cmp_error(struct cmp_connection *c, const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
|
|
va_start(va, fmt);
|
|
dev_err(&c->resources.unit->device, "%cPCR%u: %pV",
|
|
(c->direction == CMP_INPUT) ? 'i' : 'o',
|
|
c->pcr_index, &(struct va_format){ fmt, &va });
|
|
va_end(va);
|
|
}
|
|
|
|
static u64 mpr_address(struct cmp_connection *c)
|
|
{
|
|
if (c->direction == CMP_INPUT)
|
|
return CSR_REGISTER_BASE + CSR_IMPR;
|
|
else
|
|
return CSR_REGISTER_BASE + CSR_OMPR;
|
|
}
|
|
|
|
static u64 pcr_address(struct cmp_connection *c)
|
|
{
|
|
if (c->direction == CMP_INPUT)
|
|
return CSR_REGISTER_BASE + CSR_IPCR(c->pcr_index);
|
|
else
|
|
return CSR_REGISTER_BASE + CSR_OPCR(c->pcr_index);
|
|
}
|
|
|
|
static int pcr_modify(struct cmp_connection *c,
|
|
__be32 (*modify)(struct cmp_connection *c, __be32 old),
|
|
int (*check)(struct cmp_connection *c, __be32 pcr),
|
|
enum bus_reset_handling bus_reset_handling)
|
|
{
|
|
__be32 old_arg, buffer[2];
|
|
int err;
|
|
|
|
buffer[0] = c->last_pcr_value;
|
|
for (;;) {
|
|
old_arg = buffer[0];
|
|
buffer[1] = modify(c, buffer[0]);
|
|
|
|
err = snd_fw_transaction(
|
|
c->resources.unit, TCODE_LOCK_COMPARE_SWAP,
|
|
pcr_address(c), buffer, 8,
|
|
FW_FIXED_GENERATION | c->resources.generation);
|
|
|
|
if (err < 0) {
|
|
if (err == -EAGAIN &&
|
|
bus_reset_handling == SUCCEED_ON_BUS_RESET)
|
|
err = 0;
|
|
return err;
|
|
}
|
|
|
|
if (buffer[0] == old_arg) /* success? */
|
|
break;
|
|
|
|
if (check) {
|
|
err = check(c, buffer[0]);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
}
|
|
c->last_pcr_value = buffer[1];
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* cmp_connection_init - initializes a connection manager
|
|
* @c: the connection manager to initialize
|
|
* @unit: a unit of the target device
|
|
* @direction: input or output
|
|
* @pcr_index: the index of the iPCR/oPCR on the target device
|
|
*/
|
|
int cmp_connection_init(struct cmp_connection *c,
|
|
struct fw_unit *unit,
|
|
enum cmp_direction direction,
|
|
unsigned int pcr_index)
|
|
{
|
|
__be32 mpr_be;
|
|
u32 mpr;
|
|
int err;
|
|
|
|
c->direction = direction;
|
|
err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
|
|
mpr_address(c), &mpr_be, 4, 0);
|
|
if (err < 0)
|
|
return err;
|
|
mpr = be32_to_cpu(mpr_be);
|
|
|
|
if (pcr_index >= (mpr & MPR_PLUGS_MASK))
|
|
return -EINVAL;
|
|
|
|
err = fw_iso_resources_init(&c->resources, unit);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
c->connected = false;
|
|
mutex_init(&c->mutex);
|
|
c->last_pcr_value = cpu_to_be32(0x80000000);
|
|
c->pcr_index = pcr_index;
|
|
c->max_speed = (mpr & MPR_SPEED_MASK) >> MPR_SPEED_SHIFT;
|
|
if (c->max_speed == SCODE_BETA)
|
|
c->max_speed += (mpr & MPR_XSPEED_MASK) >> MPR_XSPEED_SHIFT;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(cmp_connection_init);
|
|
|
|
/**
|
|
* cmp_connection_check_used - check connection is already esablished or not
|
|
* @c: the connection manager to be checked
|
|
* @used: the pointer to store the result of checking the connection
|
|
*/
|
|
int cmp_connection_check_used(struct cmp_connection *c, bool *used)
|
|
{
|
|
__be32 pcr;
|
|
int err;
|
|
|
|
err = snd_fw_transaction(
|
|
c->resources.unit, TCODE_READ_QUADLET_REQUEST,
|
|
pcr_address(c), &pcr, 4, 0);
|
|
if (err >= 0)
|
|
*used = !!(pcr & cpu_to_be32(PCR_BCAST_CONN |
|
|
PCR_P2P_CONN_MASK));
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(cmp_connection_check_used);
|
|
|
|
/**
|
|
* cmp_connection_destroy - free connection manager resources
|
|
* @c: the connection manager
|
|
*/
|
|
void cmp_connection_destroy(struct cmp_connection *c)
|
|
{
|
|
WARN_ON(c->connected);
|
|
mutex_destroy(&c->mutex);
|
|
fw_iso_resources_destroy(&c->resources);
|
|
}
|
|
EXPORT_SYMBOL(cmp_connection_destroy);
|
|
|
|
|
|
static __be32 ipcr_set_modify(struct cmp_connection *c, __be32 ipcr)
|
|
{
|
|
ipcr &= ~cpu_to_be32(PCR_BCAST_CONN |
|
|
PCR_P2P_CONN_MASK |
|
|
PCR_CHANNEL_MASK);
|
|
ipcr |= cpu_to_be32(1 << PCR_P2P_CONN_SHIFT);
|
|
ipcr |= cpu_to_be32(c->resources.channel << PCR_CHANNEL_SHIFT);
|
|
|
|
return ipcr;
|
|
}
|
|
|
|
static int get_overhead_id(struct cmp_connection *c)
|
|
{
|
|
int id;
|
|
|
|
/*
|
|
* apply "oPCR overhead ID encoding"
|
|
* the encoding table can convert up to 512.
|
|
* here the value over 512 is converted as the same way as 512.
|
|
*/
|
|
for (id = 1; id < 16; id++) {
|
|
if (c->resources.bandwidth_overhead < (id << 5))
|
|
break;
|
|
}
|
|
if (id == 16)
|
|
id = 0;
|
|
|
|
return id;
|
|
}
|
|
|
|
static __be32 opcr_set_modify(struct cmp_connection *c, __be32 opcr)
|
|
{
|
|
unsigned int spd, xspd;
|
|
|
|
/* generate speed and extended speed field value */
|
|
if (c->speed > SCODE_400) {
|
|
spd = SCODE_800;
|
|
xspd = c->speed - SCODE_800;
|
|
} else {
|
|
spd = c->speed;
|
|
xspd = 0;
|
|
}
|
|
|
|
opcr &= ~cpu_to_be32(PCR_BCAST_CONN |
|
|
PCR_P2P_CONN_MASK |
|
|
OPCR_XSPEED_MASK |
|
|
PCR_CHANNEL_MASK |
|
|
OPCR_SPEED_MASK |
|
|
OPCR_OVERHEAD_ID_MASK);
|
|
opcr |= cpu_to_be32(1 << PCR_P2P_CONN_SHIFT);
|
|
opcr |= cpu_to_be32(xspd << OPCR_XSPEED_SHIFT);
|
|
opcr |= cpu_to_be32(c->resources.channel << PCR_CHANNEL_SHIFT);
|
|
opcr |= cpu_to_be32(spd << OPCR_SPEED_SHIFT);
|
|
opcr |= cpu_to_be32(get_overhead_id(c) << OPCR_OVERHEAD_ID_SHIFT);
|
|
|
|
return opcr;
|
|
}
|
|
|
|
static int pcr_set_check(struct cmp_connection *c, __be32 pcr)
|
|
{
|
|
if (pcr & cpu_to_be32(PCR_BCAST_CONN |
|
|
PCR_P2P_CONN_MASK)) {
|
|
cmp_error(c, "plug is already in use\n");
|
|
return -EBUSY;
|
|
}
|
|
if (!(pcr & cpu_to_be32(PCR_ONLINE))) {
|
|
cmp_error(c, "plug is not on-line\n");
|
|
return -ECONNREFUSED;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cmp_connection_establish - establish a connection to the target
|
|
* @c: the connection manager
|
|
* @max_payload_bytes: the amount of data (including CIP headers) per packet
|
|
*
|
|
* This function establishes a point-to-point connection from the local
|
|
* computer to the target by allocating isochronous resources (channel and
|
|
* bandwidth) and setting the target's input/output plug control register.
|
|
* When this function succeeds, the caller is responsible for starting
|
|
* transmitting packets.
|
|
*/
|
|
int cmp_connection_establish(struct cmp_connection *c,
|
|
unsigned int max_payload_bytes)
|
|
{
|
|
int err;
|
|
|
|
if (WARN_ON(c->connected))
|
|
return -EISCONN;
|
|
|
|
c->speed = min(c->max_speed,
|
|
fw_parent_device(c->resources.unit)->max_speed);
|
|
|
|
mutex_lock(&c->mutex);
|
|
|
|
retry_after_bus_reset:
|
|
err = fw_iso_resources_allocate(&c->resources,
|
|
max_payload_bytes, c->speed);
|
|
if (err < 0)
|
|
goto err_mutex;
|
|
|
|
if (c->direction == CMP_OUTPUT)
|
|
err = pcr_modify(c, opcr_set_modify, pcr_set_check,
|
|
ABORT_ON_BUS_RESET);
|
|
else
|
|
err = pcr_modify(c, ipcr_set_modify, pcr_set_check,
|
|
ABORT_ON_BUS_RESET);
|
|
|
|
if (err == -EAGAIN) {
|
|
fw_iso_resources_free(&c->resources);
|
|
goto retry_after_bus_reset;
|
|
}
|
|
if (err < 0)
|
|
goto err_resources;
|
|
|
|
c->connected = true;
|
|
|
|
mutex_unlock(&c->mutex);
|
|
|
|
return 0;
|
|
|
|
err_resources:
|
|
fw_iso_resources_free(&c->resources);
|
|
err_mutex:
|
|
mutex_unlock(&c->mutex);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(cmp_connection_establish);
|
|
|
|
/**
|
|
* cmp_connection_update - update the connection after a bus reset
|
|
* @c: the connection manager
|
|
*
|
|
* This function must be called from the driver's .update handler to
|
|
* reestablish any connection that might have been active.
|
|
*
|
|
* Returns zero on success, or a negative error code. On an error, the
|
|
* connection is broken and the caller must stop transmitting iso packets.
|
|
*/
|
|
int cmp_connection_update(struct cmp_connection *c)
|
|
{
|
|
int err;
|
|
|
|
mutex_lock(&c->mutex);
|
|
|
|
if (!c->connected) {
|
|
mutex_unlock(&c->mutex);
|
|
return 0;
|
|
}
|
|
|
|
err = fw_iso_resources_update(&c->resources);
|
|
if (err < 0)
|
|
goto err_unconnect;
|
|
|
|
if (c->direction == CMP_OUTPUT)
|
|
err = pcr_modify(c, opcr_set_modify, pcr_set_check,
|
|
SUCCEED_ON_BUS_RESET);
|
|
else
|
|
err = pcr_modify(c, ipcr_set_modify, pcr_set_check,
|
|
SUCCEED_ON_BUS_RESET);
|
|
|
|
if (err < 0)
|
|
goto err_resources;
|
|
|
|
mutex_unlock(&c->mutex);
|
|
|
|
return 0;
|
|
|
|
err_resources:
|
|
fw_iso_resources_free(&c->resources);
|
|
err_unconnect:
|
|
c->connected = false;
|
|
mutex_unlock(&c->mutex);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(cmp_connection_update);
|
|
|
|
static __be32 pcr_break_modify(struct cmp_connection *c, __be32 pcr)
|
|
{
|
|
return pcr & ~cpu_to_be32(PCR_BCAST_CONN | PCR_P2P_CONN_MASK);
|
|
}
|
|
|
|
/**
|
|
* cmp_connection_break - break the connection to the target
|
|
* @c: the connection manager
|
|
*
|
|
* This function deactives the connection in the target's input/output plug
|
|
* control register, and frees the isochronous resources of the connection.
|
|
* Before calling this function, the caller should cease transmitting packets.
|
|
*/
|
|
void cmp_connection_break(struct cmp_connection *c)
|
|
{
|
|
int err;
|
|
|
|
mutex_lock(&c->mutex);
|
|
|
|
if (!c->connected) {
|
|
mutex_unlock(&c->mutex);
|
|
return;
|
|
}
|
|
|
|
err = pcr_modify(c, pcr_break_modify, NULL, SUCCEED_ON_BUS_RESET);
|
|
if (err < 0)
|
|
cmp_error(c, "plug is still connected\n");
|
|
|
|
fw_iso_resources_free(&c->resources);
|
|
|
|
c->connected = false;
|
|
|
|
mutex_unlock(&c->mutex);
|
|
}
|
|
EXPORT_SYMBOL(cmp_connection_break);
|