diff options
author | James Morris <jmorris@namei.org> | 2008-09-21 17:41:56 -0700 |
---|---|---|
committer | James Morris <jmorris@namei.org> | 2008-09-21 17:41:56 -0700 |
commit | ab2b49518e743962f71b94246855c44ee9cf52cc (patch) | |
tree | 26b260a350f0a0a0d19b558bf147b812e3a1564c /drivers/i2c | |
parent | f058925b201357fba48d56cc9c1719ae274b2022 (diff) | |
parent | 72d31053f62c4bc464c2783974926969614a8649 (diff) |
Merge branch 'master' into next
Conflicts:
MAINTAINERS
Thanks for breaking my tree :-)
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'drivers/i2c')
-rw-r--r-- | drivers/i2c/busses/i2c-sh_mobile.c | 271 | ||||
-rw-r--r-- | drivers/i2c/i2c-core.c | 18 |
2 files changed, 218 insertions, 71 deletions
diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c index 840e634fa31..640cbb23732 100644 --- a/drivers/i2c/busses/i2c-sh_mobile.c +++ b/drivers/i2c/busses/i2c-sh_mobile.c @@ -31,13 +31,84 @@ #include <linux/clk.h> #include <linux/io.h> +/* Transmit operation: */ +/* */ +/* 0 byte transmit */ +/* BUS: S A8 ACK P */ +/* IRQ: DTE WAIT */ +/* ICIC: */ +/* ICCR: 0x94 0x90 */ +/* ICDR: A8 */ +/* */ +/* 1 byte transmit */ +/* BUS: S A8 ACK D8(1) ACK P */ +/* IRQ: DTE WAIT WAIT */ +/* ICIC: -DTE */ +/* ICCR: 0x94 0x90 */ +/* ICDR: A8 D8(1) */ +/* */ +/* 2 byte transmit */ +/* BUS: S A8 ACK D8(1) ACK D8(2) ACK P */ +/* IRQ: DTE WAIT WAIT WAIT */ +/* ICIC: -DTE */ +/* ICCR: 0x94 0x90 */ +/* ICDR: A8 D8(1) D8(2) */ +/* */ +/* 3 bytes or more, +---------+ gets repeated */ +/* */ +/* */ +/* Receive operation: */ +/* */ +/* 0 byte receive - not supported since slave may hold SDA low */ +/* */ +/* 1 byte receive [TX] | [RX] */ +/* BUS: S A8 ACK | D8(1) ACK P */ +/* IRQ: DTE WAIT | WAIT DTE */ +/* ICIC: -DTE | +DTE */ +/* ICCR: 0x94 0x81 | 0xc0 */ +/* ICDR: A8 | D8(1) */ +/* */ +/* 2 byte receive [TX]| [RX] */ +/* BUS: S A8 ACK | D8(1) ACK D8(2) ACK P */ +/* IRQ: DTE WAIT | WAIT WAIT DTE */ +/* ICIC: -DTE | +DTE */ +/* ICCR: 0x94 0x81 | 0xc0 */ +/* ICDR: A8 | D8(1) D8(2) */ +/* */ +/* 3 byte receive [TX] | [RX] */ +/* BUS: S A8 ACK | D8(1) ACK D8(2) ACK D8(3) ACK P */ +/* IRQ: DTE WAIT | WAIT WAIT WAIT DTE */ +/* ICIC: -DTE | +DTE */ +/* ICCR: 0x94 0x81 | 0xc0 */ +/* ICDR: A8 | D8(1) D8(2) D8(3) */ +/* */ +/* 4 bytes or more, this part is repeated +---------+ */ +/* */ +/* */ +/* Interrupt order and BUSY flag */ +/* ___ _ */ +/* SDA ___\___XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXAAAAAAAAA___/ */ +/* SCL \_/1\_/2\_/3\_/4\_/5\_/6\_/7\_/8\___/9\_____/ */ +/* */ +/* S D7 D6 D5 D4 D3 D2 D1 D0 P */ +/* ___ */ +/* WAIT IRQ ________________________________/ \___________ */ +/* TACK IRQ ____________________________________/ \_______ */ +/* DTE IRQ __________________________________________/ \_ */ +/* AL IRQ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ +/* _______________________________________________ */ +/* BUSY __/ \_ */ +/* */ + enum sh_mobile_i2c_op { OP_START = 0, - OP_TX_ONLY, + OP_TX_FIRST, + OP_TX, OP_TX_STOP, OP_TX_TO_RX, - OP_RX_ONLY, + OP_RX, OP_RX_STOP, + OP_RX_STOP_DATA, }; struct sh_mobile_i2c_data { @@ -127,25 +198,34 @@ static unsigned char i2c_op(struct sh_mobile_i2c_data *pd, spin_lock_irqsave(&pd->lock, flags); switch (op) { - case OP_START: + case OP_START: /* issue start and trigger DTE interrupt */ iowrite8(0x94, ICCR(pd)); break; - case OP_TX_ONLY: + case OP_TX_FIRST: /* disable DTE interrupt and write data */ + iowrite8(ICIC_WAITE | ICIC_ALE | ICIC_TACKE, ICIC(pd)); iowrite8(data, ICDR(pd)); break; - case OP_TX_STOP: + case OP_TX: /* write data */ iowrite8(data, ICDR(pd)); - iowrite8(0x90, ICCR(pd)); - iowrite8(ICIC_ALE | ICIC_TACKE, ICIC(pd)); break; - case OP_TX_TO_RX: + case OP_TX_STOP: /* write data and issue a stop afterwards */ iowrite8(data, ICDR(pd)); + iowrite8(0x90, ICCR(pd)); + break; + case OP_TX_TO_RX: /* select read mode */ iowrite8(0x81, ICCR(pd)); break; - case OP_RX_ONLY: + case OP_RX: /* just read data */ ret = ioread8(ICDR(pd)); break; - case OP_RX_STOP: + case OP_RX_STOP: /* enable DTE interrupt, issue stop */ + iowrite8(ICIC_DTEE | ICIC_WAITE | ICIC_ALE | ICIC_TACKE, + ICIC(pd)); + iowrite8(0xc0, ICCR(pd)); + break; + case OP_RX_STOP_DATA: /* enable DTE interrupt, read data, issue stop */ + iowrite8(ICIC_DTEE | ICIC_WAITE | ICIC_ALE | ICIC_TACKE, + ICIC(pd)); ret = ioread8(ICDR(pd)); iowrite8(0xc0, ICCR(pd)); break; @@ -157,58 +237,120 @@ static unsigned char i2c_op(struct sh_mobile_i2c_data *pd, return ret; } +static int sh_mobile_i2c_is_first_byte(struct sh_mobile_i2c_data *pd) +{ + if (pd->pos == -1) + return 1; + + return 0; +} + +static int sh_mobile_i2c_is_last_byte(struct sh_mobile_i2c_data *pd) +{ + if (pd->pos == (pd->msg->len - 1)) + return 1; + + return 0; +} + +static void sh_mobile_i2c_get_data(struct sh_mobile_i2c_data *pd, + unsigned char *buf) +{ + switch (pd->pos) { + case -1: + *buf = (pd->msg->addr & 0x7f) << 1; + *buf |= (pd->msg->flags & I2C_M_RD) ? 1 : 0; + break; + default: + *buf = pd->msg->buf[pd->pos]; + } +} + +static int sh_mobile_i2c_isr_tx(struct sh_mobile_i2c_data *pd) +{ + unsigned char data; + + if (pd->pos == pd->msg->len) + return 1; + + sh_mobile_i2c_get_data(pd, &data); + + if (sh_mobile_i2c_is_last_byte(pd)) + i2c_op(pd, OP_TX_STOP, data); + else if (sh_mobile_i2c_is_first_byte(pd)) + i2c_op(pd, OP_TX_FIRST, data); + else + i2c_op(pd, OP_TX, data); + + pd->pos++; + return 0; +} + +static int sh_mobile_i2c_isr_rx(struct sh_mobile_i2c_data *pd) +{ + unsigned char data; + int real_pos; + + do { + if (pd->pos <= -1) { + sh_mobile_i2c_get_data(pd, &data); + + if (sh_mobile_i2c_is_first_byte(pd)) + i2c_op(pd, OP_TX_FIRST, data); + else + i2c_op(pd, OP_TX, data); + break; + } + + if (pd->pos == 0) { + i2c_op(pd, OP_TX_TO_RX, 0); + break; + } + + real_pos = pd->pos - 2; + + if (pd->pos == pd->msg->len) { + if (real_pos < 0) { + i2c_op(pd, OP_RX_STOP, 0); + break; + } + data = i2c_op(pd, OP_RX_STOP_DATA, 0); + } else + data = i2c_op(pd, OP_RX, 0); + + pd->msg->buf[real_pos] = data; + } while (0); + + pd->pos++; + return pd->pos == (pd->msg->len + 2); +} + static irqreturn_t sh_mobile_i2c_isr(int irq, void *dev_id) { struct platform_device *dev = dev_id; struct sh_mobile_i2c_data *pd = platform_get_drvdata(dev); - struct i2c_msg *msg = pd->msg; - unsigned char data, sr; - int wakeup = 0; + unsigned char sr; + int wakeup; sr = ioread8(ICSR(pd)); - pd->sr |= sr; + pd->sr |= sr; /* remember state */ dev_dbg(pd->dev, "i2c_isr 0x%02x 0x%02x %s %d %d!\n", sr, pd->sr, - (msg->flags & I2C_M_RD) ? "read" : "write", - pd->pos, msg->len); + (pd->msg->flags & I2C_M_RD) ? "read" : "write", + pd->pos, pd->msg->len); if (sr & (ICSR_AL | ICSR_TACK)) { - iowrite8(0, ICIC(pd)); /* disable interrupts */ - wakeup = 1; - goto do_wakeup; - } + /* don't interrupt transaction - continue to issue stop */ + iowrite8(sr & ~(ICSR_AL | ICSR_TACK), ICSR(pd)); + wakeup = 0; + } else if (pd->msg->flags & I2C_M_RD) + wakeup = sh_mobile_i2c_isr_rx(pd); + else + wakeup = sh_mobile_i2c_isr_tx(pd); - if (pd->pos == msg->len) { - i2c_op(pd, OP_RX_ONLY, 0); - wakeup = 1; - goto do_wakeup; - } + if (sr & ICSR_WAIT) /* TODO: add delay here to support slow acks */ + iowrite8(sr & ~ICSR_WAIT, ICSR(pd)); - if (pd->pos == -1) { - data = (msg->addr & 0x7f) << 1; - data |= (msg->flags & I2C_M_RD) ? 1 : 0; - } else - data = msg->buf[pd->pos]; - - if ((pd->pos == -1) || !(msg->flags & I2C_M_RD)) { - if (msg->flags & I2C_M_RD) - i2c_op(pd, OP_TX_TO_RX, data); - else if (pd->pos == (msg->len - 1)) { - i2c_op(pd, OP_TX_STOP, data); - wakeup = 1; - } else - i2c_op(pd, OP_TX_ONLY, data); - } else { - if (pd->pos == (msg->len - 1)) - data = i2c_op(pd, OP_RX_STOP, 0); - else - data = i2c_op(pd, OP_RX_ONLY, 0); - - msg->buf[pd->pos] = data; - } - pd->pos++; - - do_wakeup: if (wakeup) { pd->sr |= SW_DONE; wake_up(&pd->wait); @@ -219,6 +361,11 @@ static irqreturn_t sh_mobile_i2c_isr(int irq, void *dev_id) static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg) { + if (usr_msg->len == 0 && (usr_msg->flags & I2C_M_RD)) { + dev_err(pd->dev, "Unsupported zero length i2c read\n"); + return -EIO; + } + /* Initialize channel registers */ iowrite8(ioread8(ICCR(pd)) & ~ICCR_ICE, ICCR(pd)); @@ -233,9 +380,8 @@ static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg) pd->pos = -1; pd->sr = 0; - /* Enable all interrupts except wait */ - iowrite8(ioread8(ICIC(pd)) | ICIC_ALE | ICIC_TACKE | ICIC_DTEE, - ICIC(pd)); + /* Enable all interrupts to begin with */ + iowrite8(ICIC_WAITE | ICIC_ALE | ICIC_TACKE | ICIC_DTEE, ICIC(pd)); return 0; } @@ -268,25 +414,18 @@ static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter, if (!k) dev_err(pd->dev, "Transfer request timed out\n"); - retry_count = 10; + retry_count = 1000; again: val = ioread8(ICSR(pd)); dev_dbg(pd->dev, "val 0x%02x pd->sr 0x%02x\n", val, pd->sr); - if ((val | pd->sr) & (ICSR_TACK | ICSR_AL)) { - err = -EIO; - break; - } - /* the interrupt handler may wake us up before the * transfer is finished, so poll the hardware * until we're done. */ - - if (!(!(val & ICSR_BUSY) && (val & ICSR_SCLM) && - (val & ICSR_SDAM))) { - msleep(1); + if (val & ICSR_BUSY) { + udelay(10); if (retry_count--) goto again; @@ -294,6 +433,12 @@ again: dev_err(pd->dev, "Polling timed out\n"); break; } + + /* handle missing acknowledge and arbitration lost */ + if ((val | pd->sr) & (ICSR_TACK | ICSR_AL)) { + err = -EIO; + break; + } } deactivate_ch(pd); diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 550853f79ae..b346a687ab5 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -108,6 +108,9 @@ static int i2c_device_probe(struct device *dev) if (!driver->probe || !driver->id_table) return -ENODEV; client->driver = driver; + if (!device_can_wakeup(&client->dev)) + device_init_wakeup(&client->dev, + client->flags & I2C_CLIENT_WAKE); dev_dbg(dev, "probe\n"); status = driver->probe(client, i2c_match_id(driver->id_table, client)); @@ -262,9 +265,8 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info) client->adapter = adap; client->dev.platform_data = info->platform_data; - device_init_wakeup(&client->dev, info->flags & I2C_CLIENT_WAKE); - client->flags = info->flags & ~I2C_CLIENT_WAKE; + client->flags = info->flags; client->addr = info->addr; client->irq = info->irq; @@ -1188,8 +1190,8 @@ int i2c_probe(struct i2c_adapter *adapter, && address_data->normal_i2c[0] == I2C_CLIENT_END) return 0; - dev_warn(&adapter->dev, "SMBus Quick command not supported, " - "can't probe for chips\n"); + dev_dbg(&adapter->dev, "SMBus Quick command not supported, " + "can't probe for chips\n"); return -EOPNOTSUPP; } @@ -1350,6 +1352,10 @@ static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver) } } + /* Stop here if the classes do not match */ + if (!(adapter->class & driver->class)) + goto exit_free; + /* Stop here if we can't use SMBUS_QUICK */ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK)) { if (address_data->probe[0] == I2C_CLIENT_END @@ -1362,10 +1368,6 @@ static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver) goto exit_free; } - /* Stop here if the classes do not match */ - if (!(adapter->class & driver->class)) - goto exit_free; - /* Probe entries are done second, and are not affected by ignore entries either */ for (i = 0; address_data->probe[i] != I2C_CLIENT_END; i += 2) { |