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ALSA: firewire-lib: Add handling output connection by CMP

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This patch adds some macros, codes with condition of direction and new functions
to handle output connection. Once cmp_connection_init() is executed with its
direction, CMP input and output connection can be handled by the same way.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2014-04-25 22:44:56 +09:00 committed by Takashi Iwai
parent c68a1c6584
commit 44aff6980a
1 changed files with 90 additions and 9 deletions
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99
sound/firewire/cmp.c
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@ -29,6 +29,14 @@
#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,
@ -41,10 +49,27 @@ void cmp_error(struct cmp_connection *c, const char *fmt, ...)
va_start(va, fmt);
dev_err(&c->resources.unit->device, "%cPCR%u: %pV",
'i', c->pcr_index, &(struct va_format){ fmt, &va });
(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),
@ -60,8 +85,7 @@ static int pcr_modify(struct cmp_connection *c,
err = snd_fw_transaction(
c->resources.unit, TCODE_LOCK_COMPARE_SWAP,
CSR_REGISTER_BASE + CSR_IPCR(c->pcr_index),
buffer, 8,
pcr_address(c), buffer, 8,
FW_FIXED_GENERATION | c->resources.generation);
if (err < 0) {
@ -101,9 +125,9 @@ int cmp_connection_init(struct cmp_connection *c,
u32 mpr;
int err;
c->direction = direction;
err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
CSR_REGISTER_BASE + CSR_IMPR,
&mpr_be, 4, 0);
mpr_address(c), &mpr_be, 4, 0);
if (err < 0)
return err;
mpr = be32_to_cpu(mpr_be);
@ -151,6 +175,53 @@ static __be32 ipcr_set_modify(struct cmp_connection *c, __be32 ipcr)
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 |
@ -196,8 +267,13 @@ retry_after_bus_reset:
if (err < 0)
goto err_mutex;
err = pcr_modify(c, ipcr_set_modify, pcr_set_check,
ABORT_ON_BUS_RESET);
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;
@ -245,8 +321,13 @@ int cmp_connection_update(struct cmp_connection *c)
if (err < 0)
goto err_unconnect;
err = pcr_modify(c, ipcr_set_modify, pcr_set_check,
SUCCEED_ON_BUS_RESET);
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;