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soundwire: Add helpers for ports operations 

Add helpers to configure, prepare, enable, disable and
de-prepare ports.

Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com>
Signed-off-by: Shreyas NC <shreyas.nc@intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Sanyog Kale 2018-04-26 18:38:23 +05:30 committed by Vinod Koul
parent f8101c74aa
commit 79df15b7d3
4 changed files with 353 additions and 0 deletions
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26
drivers/soundwire/bus.c
View File

@ -577,6 +577,32 @@ static void sdw_modify_slave_status(struct sdw_slave *slave,
mutex_unlock(&slave->bus->bus_lock);
}
int sdw_configure_dpn_intr(struct sdw_slave *slave,
int port, bool enable, int mask)
{
u32 addr;
int ret;
u8 val = 0;
addr = SDW_DPN_INTMASK(port);
/* Set/Clear port ready interrupt mask */
if (enable) {
val |= mask;
val |= SDW_DPN_INT_PORT_READY;
} else {
val &= ~(mask);
val &= ~SDW_DPN_INT_PORT_READY;
}
ret = sdw_update(slave, addr, (mask | SDW_DPN_INT_PORT_READY), val);
if (ret < 0)
dev_err(slave->bus->dev,
"SDW_DPN_INTMASK write failed:%d", val);
return ret;
}
static int sdw_initialize_slave(struct sdw_slave *slave)
{
struct sdw_slave_prop *prop = &slave->prop;

2
drivers/soundwire/bus.h
View File

@ -109,6 +109,8 @@ struct sdw_master_runtime {
struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
enum sdw_data_direction direction,
unsigned int port_num);
int sdw_configure_dpn_intr(struct sdw_slave *slave, int port,
bool enable, int mask);
int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg);
int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,

271
drivers/soundwire/stream.c
View File

@ -243,6 +243,277 @@ static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
return 0;
}
/**
* sdw_enable_disable_slave_ports: Enable/disable slave data port
*
* @bus: bus instance
* @s_rt: slave runtime
* @p_rt: port runtime
* @en: enable or disable operation
*
* This function only sets the enable/disable bits in the relevant bank, the
* actual enable/disable is done with a bank switch
*/
static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
struct sdw_slave_runtime *s_rt,
struct sdw_port_runtime *p_rt, bool en)
{
struct sdw_transport_params *t_params = &p_rt->transport_params;
u32 addr;
int ret;
if (bus->params.next_bank)
addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
else
addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
/*
* Since bus doesn't support sharing a port across two streams,
* it is safe to reset this register
*/
if (en)
ret = sdw_update(s_rt->slave, addr, 0xFF, p_rt->ch_mask);
else
ret = sdw_update(s_rt->slave, addr, 0xFF, 0x0);
if (ret < 0)
dev_err(&s_rt->slave->dev,
"Slave chn_en reg write failed:%d port:%d",
ret, t_params->port_num);
return ret;
}
static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
struct sdw_port_runtime *p_rt, bool en)
{
struct sdw_transport_params *t_params = &p_rt->transport_params;
struct sdw_bus *bus = m_rt->bus;
struct sdw_enable_ch enable_ch;
int ret = 0;
enable_ch.port_num = p_rt->num;
enable_ch.ch_mask = p_rt->ch_mask;
enable_ch.enable = en;
/* Perform Master port channel(s) enable/disable */
if (bus->port_ops->dpn_port_enable_ch) {
ret = bus->port_ops->dpn_port_enable_ch(bus,
&enable_ch, bus->params.next_bank);
if (ret < 0) {
dev_err(bus->dev,
"Master chn_en write failed:%d port:%d",
ret, t_params->port_num);
return ret;
}
} else {
dev_err(bus->dev,
"dpn_port_enable_ch not supported, %s failed\n",
en ? "enable" : "disable");
return -EINVAL;
}
return 0;
}
/**
* sdw_enable_disable_ports() - Enable/disable port(s) for Master and
* Slave(s)
*
* @m_rt: Master stream runtime
* @en: mode (enable/disable)
*/
static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
{
struct sdw_port_runtime *s_port, *m_port;
struct sdw_slave_runtime *s_rt = NULL;
int ret = 0;
/* Enable/Disable Slave port(s) */
list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
list_for_each_entry(s_port, &s_rt->port_list, port_node) {
ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
s_port, en);
if (ret < 0)
return ret;
}
}
/* Enable/Disable Master port(s) */
list_for_each_entry(m_port, &m_rt->port_list, port_node) {
ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
if (ret < 0)
return ret;
}
return 0;
}
static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
struct sdw_prepare_ch prep_ch, enum sdw_port_prep_ops cmd)
{
const struct sdw_slave_ops *ops = s_rt->slave->ops;
int ret;
if (ops->port_prep) {
ret = ops->port_prep(s_rt->slave, &prep_ch, cmd);
if (ret < 0) {
dev_err(&s_rt->slave->dev,
"Slave Port Prep cmd %d failed: %d", cmd, ret);
return ret;
}
}
return 0;
}
static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
struct sdw_slave_runtime *s_rt,
struct sdw_port_runtime *p_rt, bool prep)
{
struct completion *port_ready = NULL;
struct sdw_dpn_prop *dpn_prop;
struct sdw_prepare_ch prep_ch;
unsigned int time_left;
bool intr = false;
int ret = 0, val;
u32 addr;
prep_ch.num = p_rt->num;
prep_ch.ch_mask = p_rt->ch_mask;
dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
s_rt->direction,
prep_ch.num);
if (!dpn_prop) {
dev_err(bus->dev,
"Slave Port:%d properties not found", prep_ch.num);
return -EINVAL;
}
prep_ch.prepare = prep;
prep_ch.bank = bus->params.next_bank;
if (dpn_prop->device_interrupts || !dpn_prop->simple_ch_prep_sm)
intr = true;
/*
* Enable interrupt before Port prepare.
* For Port de-prepare, it is assumed that port
* was prepared earlier
*/
if (prep && intr) {
ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
dpn_prop->device_interrupts);
if (ret < 0)
return ret;
}
/* Inform slave about the impending port prepare */
sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP);
/* Prepare Slave port implementing CP_SM */
if (!dpn_prop->simple_ch_prep_sm) {
addr = SDW_DPN_PREPARECTRL(p_rt->num);
if (prep)
ret = sdw_update(s_rt->slave, addr,
0xFF, p_rt->ch_mask);
else
ret = sdw_update(s_rt->slave, addr, 0xFF, 0x0);
if (ret < 0) {
dev_err(&s_rt->slave->dev,
"Slave prep_ctrl reg write failed");
return ret;
}
/* Wait for completion on port ready */
port_ready = &s_rt->slave->port_ready[prep_ch.num];
time_left = wait_for_completion_timeout(port_ready,
msecs_to_jiffies(dpn_prop->ch_prep_timeout));
val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
val &= p_rt->ch_mask;
if (!time_left || val) {
dev_err(&s_rt->slave->dev,
"Chn prep failed for port:%d", prep_ch.num);
return -ETIMEDOUT;
}
}
/* Inform slaves about ports prepared */
sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP);
/* Disable interrupt after Port de-prepare */
if (!prep && intr)
ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
dpn_prop->device_interrupts);
return ret;
}
static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
struct sdw_port_runtime *p_rt, bool prep)
{
struct sdw_transport_params *t_params = &p_rt->transport_params;
struct sdw_bus *bus = m_rt->bus;
const struct sdw_master_port_ops *ops = bus->port_ops;
struct sdw_prepare_ch prep_ch;
int ret = 0;
prep_ch.num = p_rt->num;
prep_ch.ch_mask = p_rt->ch_mask;
prep_ch.prepare = prep; /* Prepare/De-prepare */
prep_ch.bank = bus->params.next_bank;
/* Pre-prepare/Pre-deprepare port(s) */
if (ops->dpn_port_prep) {
ret = ops->dpn_port_prep(bus, &prep_ch);
if (ret < 0) {
dev_err(bus->dev, "Port prepare failed for port:%d",
t_params->port_num);
return ret;
}
}
return ret;
}
/**
* sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
* Slave(s)
*
* @m_rt: Master runtime handle
* @prep: Prepare or De-prepare
*/
static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
{
struct sdw_slave_runtime *s_rt = NULL;
struct sdw_port_runtime *p_rt;
int ret = 0;
/* Prepare/De-prepare Slave port(s) */
list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
p_rt, prep);
if (ret < 0)
return ret;
}
}
/* Prepare/De-prepare Master port(s) */
list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
if (ret < 0)
return ret;
}
return ret;
}
/**
* sdw_release_stream() - Free the assigned stream runtime
*

54
include/linux/soundwire/sdw.h
View File

@ -376,6 +376,37 @@ enum sdw_reg_bank {
SDW_BANK1,
};
/**
* struct sdw_prepare_ch: Prepare/De-prepare Data Port channel
*
* @num: Port number
* @ch_mask: Active channel mask
* @prepare: Prepare (true) /de-prepare (false) channel
* @bank: Register bank, which bank Slave/Master driver should program for
* implementation defined registers. This is always updated to next_bank
* value read from bus params.
*
*/
struct sdw_prepare_ch {
unsigned int num;
unsigned int ch_mask;
bool prepare;
unsigned int bank;
};
/**
* enum sdw_port_prep_ops: Prepare operations for Data Port
*
* @SDW_OPS_PORT_PRE_PREP: Pre prepare operation for the Port
* @SDW_OPS_PORT_PREP: Prepare operation for the Port
* @SDW_OPS_PORT_POST_PREP: Post prepare operation for the Port
*/
enum sdw_port_prep_ops {
SDW_OPS_PORT_PRE_PREP = 0,
SDW_OPS_PORT_PREP = 1,
SDW_OPS_PORT_POST_PREP = 2,
};
/**
* struct sdw_bus_params: Structure holding bus configuration
*
@ -395,6 +426,7 @@ struct sdw_bus_params {
* @interrupt_callback: Device interrupt notification (invoked in thread
* context)
* @update_status: Update Slave status
* @port_prep: Prepare the port with parameters
*/
struct sdw_slave_ops {
int (*read_prop)(struct sdw_slave *sdw);
@ -402,6 +434,9 @@ struct sdw_slave_ops {
struct sdw_slave_intr_status *status);
int (*update_status)(struct sdw_slave *slave,
enum sdw_slave_status status);
int (*port_prep)(struct sdw_slave *slave,
struct sdw_prepare_ch *prepare_ch,
enum sdw_port_prep_ops pre_ops);
};
/**
@ -505,6 +540,19 @@ struct sdw_transport_params {
unsigned int lane_ctrl;
};
/**
* struct sdw_enable_ch: Enable/disable Data Port channel
*
* @num: Port number
* @ch_mask: Active channel mask
* @enable: Enable (true) /disable (false) channel
*/
struct sdw_enable_ch {
unsigned int port_num;
unsigned int ch_mask;
bool enable;
};
/**
* struct sdw_master_port_ops: Callback functions from bus to Master
* driver to set Master Data ports.
@ -513,6 +561,8 @@ struct sdw_transport_params {
* Mandatory callback
* @dpn_set_port_transport_params: Set transport parameters for the Master
* Port. Mandatory callback
* @dpn_port_prep: Port prepare operations for the Master Data Port.
* @dpn_port_enable_ch: Enable the channels of Master Port.
*/
struct sdw_master_port_ops {
int (*dpn_set_port_params)(struct sdw_bus *bus,
@ -521,6 +571,10 @@ struct sdw_master_port_ops {
int (*dpn_set_port_transport_params)(struct sdw_bus *bus,
struct sdw_transport_params *transport_params,
enum sdw_reg_bank bank);
int (*dpn_port_prep)(struct sdw_bus *bus,
struct sdw_prepare_ch *prepare_ch);
int (*dpn_port_enable_ch)(struct sdw_bus *bus,
struct sdw_enable_ch *enable_ch, unsigned int bank);
};
struct sdw_msg;