diff options
Diffstat (limited to 'drivers/fsi')
| -rw-r--r-- | drivers/fsi/fsi-core.c | 109 | ||||
| -rw-r--r-- | drivers/fsi/fsi-master.h | 2 |
2 files changed, 93 insertions, 18 deletions
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index f039b348e484..372a9d8a8990 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -81,6 +81,8 @@ struct fsi_slave { int id; int link; uint32_t size; /* size of slave address space */ + u8 t_send_delay; + u8 t_echo_delay; }; #define to_fsi_master(d) container_of(d, struct fsi_master, dev) @@ -239,15 +241,15 @@ static inline uint32_t fsi_smode_sid(int x) return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; } -static uint32_t fsi_slave_smode(int id) +static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly) { return FSI_SMODE_WSC | FSI_SMODE_ECRC | fsi_smode_sid(id) - | fsi_smode_echodly(0xf) | fsi_smode_senddly(0xf) + | fsi_smode_echodly(t_echodly - 1) | fsi_smode_senddly(t_senddly - 1) | fsi_smode_lbcrr(0x8); } -static int fsi_slave_set_smode(struct fsi_master *master, int link, int id) +static int fsi_slave_set_smode(struct fsi_slave *slave) { uint32_t smode; __be32 data; @@ -255,11 +257,12 @@ static int fsi_slave_set_smode(struct fsi_master *master, int link, int id) /* set our smode register with the slave ID field to 0; this enables * extended slave addressing */ - smode = fsi_slave_smode(id); + smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay); data = cpu_to_be32(smode); - return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SMODE, - &data, sizeof(data)); + return fsi_master_write(slave->master, slave->link, slave->id, + FSI_SLAVE_BASE + FSI_SMODE, + &data, sizeof(data)); } static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, @@ -268,7 +271,7 @@ static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, struct fsi_master *master = slave->master; int rc, link; uint32_t reg; - uint8_t id; + uint8_t id, send_delay, echo_delay; if (discard_errors) return -1; @@ -299,15 +302,26 @@ static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, } } + send_delay = slave->t_send_delay; + echo_delay = slave->t_echo_delay; + /* getting serious, reset the slave via BREAK */ rc = fsi_master_break(master, link); if (rc) return rc; - rc = fsi_slave_set_smode(master, link, id); + slave->t_send_delay = send_delay; + slave->t_echo_delay = echo_delay; + + rc = fsi_slave_set_smode(slave); if (rc) return rc; + if (master->link_config) + master->link_config(master, link, + slave->t_send_delay, + slave->t_echo_delay); + return fsi_slave_report_and_clear_errors(slave); } @@ -659,6 +673,50 @@ static struct device_node *fsi_slave_find_of_node(struct fsi_master *master, return NULL; } +static ssize_t slave_send_echo_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct fsi_slave *slave = to_fsi_slave(dev); + + return sprintf(buf, "%u\n", slave->t_send_delay); +} + +static ssize_t slave_send_echo_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct fsi_slave *slave = to_fsi_slave(dev); + struct fsi_master *master = slave->master; + unsigned long val; + int rc; + + if (kstrtoul(buf, 0, &val) < 0) + return -EINVAL; + + if (val < 1 || val > 16) + return -EINVAL; + + if (!master->link_config) + return -ENXIO; + + /* Current HW mandates that send and echo delay are identical */ + slave->t_send_delay = val; + slave->t_echo_delay = val; + + rc = fsi_slave_set_smode(slave); + if (rc < 0) + return rc; + if (master->link_config) + master->link_config(master, slave->link, + slave->t_send_delay, + slave->t_echo_delay); + + return count; +} + +static DEVICE_ATTR(send_echo_delays, 0600, + slave_send_echo_show, slave_send_echo_store); + static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) { uint32_t chip_id; @@ -691,14 +749,6 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", chip_id, master->idx, link, id); - rc = fsi_slave_set_smode(master, link, id); - if (rc) { - dev_warn(&master->dev, - "can't set smode on slave:%02x:%02x %d\n", - link, id, rc); - return -ENODEV; - } - /* If we're behind a master that doesn't provide a self-running bus * clock, put the slave into async mode */ @@ -727,6 +777,21 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) slave->link = link; slave->id = id; slave->size = FSI_SLAVE_SIZE_23b; + slave->t_send_delay = 16; + slave->t_echo_delay = 16; + + rc = fsi_slave_set_smode(slave); + if (rc) { + dev_warn(&master->dev, + "can't set smode on slave:%02x:%02x %d\n", + link, id, rc); + kfree(slave); + return -ENODEV; + } + if (master->link_config) + master->link_config(master, link, + slave->t_send_delay, + slave->t_echo_delay); dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); rc = device_register(&slave->dev); @@ -745,6 +810,10 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) if (rc) dev_warn(&slave->dev, "failed to create term attr: %d\n", rc); + rc = device_create_file(&slave->dev, &dev_attr_send_echo_delays); + if (rc) + dev_warn(&slave->dev, "failed to create delay attr: %d\n", rc); + rc = fsi_slave_scan(slave); if (rc) dev_dbg(&master->dev, "failed during slave scan with: %d\n", @@ -815,12 +884,16 @@ static int fsi_master_link_enable(struct fsi_master *master, int link) */ static int fsi_master_break(struct fsi_master *master, int link) { + int rc = 0; + trace_fsi_master_break(master, link); if (master->send_break) - return master->send_break(master, link); + rc = master->send_break(master, link); + if (master->link_config) + master->link_config(master, link, 16, 16); - return 0; + return rc; } static int fsi_master_scan(struct fsi_master *master) diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h index ee0b46086026..7d619c68ab9b 100644 --- a/drivers/fsi/fsi-master.h +++ b/drivers/fsi/fsi-master.h @@ -33,6 +33,8 @@ struct fsi_master { int (*term)(struct fsi_master *, int link, uint8_t id); int (*send_break)(struct fsi_master *, int link); int (*link_enable)(struct fsi_master *, int link); + int (*link_config)(struct fsi_master *, int link, + u8 t_send_delay, u8 t_echo_delay); }; #define dev_to_fsi_master(d) container_of(d, struct fsi_master, dev) |