diff options
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/firewire/cmp.c | 91 | ||||
| -rw-r--r-- | sound/firewire/cmp.h | 6 |
2 files changed, 49 insertions, 48 deletions
diff --git a/sound/firewire/cmp.c b/sound/firewire/cmp.c index efdbf585e404..deb494d6e785 100644 --- a/sound/firewire/cmp.c +++ b/sound/firewire/cmp.c @@ -14,18 +14,20 @@ #include "iso-resources.h" #include "cmp.h" -#define IMPR_SPEED_MASK 0xc0000000 -#define IMPR_SPEED_SHIFT 30 -#define IMPR_XSPEED_MASK 0x00000060 -#define IMPR_XSPEED_SHIFT 5 -#define IMPR_PLUGS_MASK 0x0000001f - -#define IPCR_ONLINE 0x80000000 -#define IPCR_BCAST_CONN 0x40000000 -#define IPCR_P2P_CONN_MASK 0x3f000000 -#define IPCR_P2P_CONN_SHIFT 24 -#define IPCR_CHANNEL_MASK 0x003f0000 -#define IPCR_CHANNEL_SHIFT 16 +/* 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 enum bus_reset_handling { ABORT_ON_BUS_RESET, @@ -88,24 +90,24 @@ static int pcr_modify(struct cmp_connection *c, * cmp_connection_init - initializes a connection manager * @c: the connection manager to initialize * @unit: a unit of the target device - * @ipcr_index: the index of the iPCR on the target device + * @pcr_index: the index of the iPCR/oPCR on the target device */ int cmp_connection_init(struct cmp_connection *c, struct fw_unit *unit, - unsigned int ipcr_index) + unsigned int pcr_index) { - __be32 impr_be; - u32 impr; + __be32 mpr_be; + u32 mpr; int err; err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST, CSR_REGISTER_BASE + CSR_IMPR, - &impr_be, 4, 0); + &mpr_be, 4, 0); if (err < 0) return err; - impr = be32_to_cpu(impr_be); + mpr = be32_to_cpu(mpr_be); - if (ipcr_index >= (impr & IMPR_PLUGS_MASK)) + if (pcr_index >= (mpr & MPR_PLUGS_MASK)) return -EINVAL; err = fw_iso_resources_init(&c->resources, unit); @@ -115,10 +117,10 @@ int cmp_connection_init(struct cmp_connection *c, c->connected = false; mutex_init(&c->mutex); c->last_pcr_value = cpu_to_be32(0x80000000); - c->pcr_index = ipcr_index; - c->max_speed = (impr & IMPR_SPEED_MASK) >> IMPR_SPEED_SHIFT; + c->pcr_index = pcr_index; + c->max_speed = (mpr & MPR_SPEED_MASK) >> MPR_SPEED_SHIFT; if (c->max_speed == SCODE_BETA) - c->max_speed += (impr & IMPR_XSPEED_MASK) >> IMPR_XSPEED_SHIFT; + c->max_speed += (mpr & MPR_XSPEED_MASK) >> MPR_XSPEED_SHIFT; return 0; } @@ -139,23 +141,23 @@ EXPORT_SYMBOL(cmp_connection_destroy); static __be32 ipcr_set_modify(struct cmp_connection *c, __be32 ipcr) { - ipcr &= ~cpu_to_be32(IPCR_BCAST_CONN | - IPCR_P2P_CONN_MASK | - IPCR_CHANNEL_MASK); - ipcr |= cpu_to_be32(1 << IPCR_P2P_CONN_SHIFT); - ipcr |= cpu_to_be32(c->resources.channel << IPCR_CHANNEL_SHIFT); + 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 ipcr_set_check(struct cmp_connection *c, __be32 ipcr) +static int pcr_set_check(struct cmp_connection *c, __be32 pcr) { - if (ipcr & cpu_to_be32(IPCR_BCAST_CONN | - IPCR_P2P_CONN_MASK)) { + if (pcr & cpu_to_be32(PCR_BCAST_CONN | + PCR_P2P_CONN_MASK)) { cmp_error(c, "plug is already in use\n"); return -EBUSY; } - if (!(ipcr & cpu_to_be32(IPCR_ONLINE))) { + if (!(pcr & cpu_to_be32(PCR_ONLINE))) { cmp_error(c, "plug is not on-line\n"); return -ECONNREFUSED; } @@ -170,9 +172,9 @@ static int ipcr_set_check(struct cmp_connection *c, __be32 ipcr) * * 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 plug control register. When this - * function succeeds, the caller is responsible for starting transmitting - * packets. + * 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) @@ -193,7 +195,7 @@ retry_after_bus_reset: if (err < 0) goto err_mutex; - err = pcr_modify(c, ipcr_set_modify, ipcr_set_check, + err = pcr_modify(c, ipcr_set_modify, pcr_set_check, ABORT_ON_BUS_RESET); if (err == -EAGAIN) { fw_iso_resources_free(&c->resources); @@ -221,8 +223,8 @@ 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. + * 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. @@ -242,7 +244,7 @@ int cmp_connection_update(struct cmp_connection *c) if (err < 0) goto err_unconnect; - err = pcr_modify(c, ipcr_set_modify, ipcr_set_check, + err = pcr_modify(c, ipcr_set_modify, pcr_set_check, SUCCEED_ON_BUS_RESET); if (err < 0) goto err_resources; @@ -261,19 +263,18 @@ err_unconnect: } EXPORT_SYMBOL(cmp_connection_update); - -static __be32 ipcr_break_modify(struct cmp_connection *c, __be32 ipcr) +static __be32 pcr_break_modify(struct cmp_connection *c, __be32 pcr) { - return ipcr & ~cpu_to_be32(IPCR_BCAST_CONN | IPCR_P2P_CONN_MASK); + 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 plug control - * register, and frees the isochronous resources of the connection. Before - * calling this function, the caller should cease transmitting packets. + * 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) { @@ -286,7 +287,7 @@ void cmp_connection_break(struct cmp_connection *c) return; } - err = pcr_modify(c, ipcr_break_modify, NULL, SUCCEED_ON_BUS_RESET); + err = pcr_modify(c, pcr_break_modify, NULL, SUCCEED_ON_BUS_RESET); if (err < 0) cmp_error(c, "plug is still connected\n"); diff --git a/sound/firewire/cmp.h b/sound/firewire/cmp.h index f47de08feb12..2320cd44d499 100644 --- a/sound/firewire/cmp.h +++ b/sound/firewire/cmp.h @@ -11,8 +11,8 @@ struct fw_unit; * struct cmp_connection - manages an isochronous connection to a device * @speed: the connection's actual speed * - * This structure manages (using CMP) an isochronous stream from the local - * computer to a device's input plug (iPCR). + * This structure manages (using CMP) an isochronous stream between the local + * computer and a device's input plug (iPCR) and output plug (oPCR). * * There is no corresponding oPCR created on the local computer, so it is not * possible to overlay connections on top of this one. @@ -30,7 +30,7 @@ struct cmp_connection { int cmp_connection_init(struct cmp_connection *connection, struct fw_unit *unit, - unsigned int ipcr_index); + unsigned int pcr_index); void cmp_connection_destroy(struct cmp_connection *connection); int cmp_connection_establish(struct cmp_connection *connection, |