struct i2c_msg *pmsg;
int msg_num;
int cur_msg;
+ void __iomem *regs_base;
};
-static struct bfin_twi_iface twi_iface;
+
+#define DEFINE_TWI_REG(reg, off) \
+static inline u16 read_##reg(struct bfin_twi_iface *iface) \
+ { return bfin_read16(iface->regs_base + (off)); } \
+static inline void write_##reg(struct bfin_twi_iface *iface, u16 v) \
+ { bfin_write16(iface->regs_base + (off), v); }
+
+DEFINE_TWI_REG(CLKDIV, 0x00)
+DEFINE_TWI_REG(CONTROL, 0x04)
+DEFINE_TWI_REG(SLAVE_CTL, 0x08)
+DEFINE_TWI_REG(SLAVE_STAT, 0x0C)
+DEFINE_TWI_REG(SLAVE_ADDR, 0x10)
+DEFINE_TWI_REG(MASTER_CTL, 0x14)
+DEFINE_TWI_REG(MASTER_STAT, 0x18)
+DEFINE_TWI_REG(MASTER_ADDR, 0x1C)
+DEFINE_TWI_REG(INT_STAT, 0x20)
+DEFINE_TWI_REG(INT_MASK, 0x24)
+DEFINE_TWI_REG(FIFO_CTL, 0x28)
+DEFINE_TWI_REG(FIFO_STAT, 0x2C)
+DEFINE_TWI_REG(XMT_DATA8, 0x80)
+DEFINE_TWI_REG(XMT_DATA16, 0x84)
+DEFINE_TWI_REG(RCV_DATA8, 0x88)
+DEFINE_TWI_REG(RCV_DATA16, 0x8C)
static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
{
- unsigned short twi_int_status = bfin_read_TWI_INT_STAT();
- unsigned short mast_stat = bfin_read_TWI_MASTER_STAT();
+ unsigned short twi_int_status = read_INT_STAT(iface);
+ unsigned short mast_stat = read_MASTER_STAT(iface);
if (twi_int_status & XMTSERV) {
/* Transmit next data */
if (iface->writeNum > 0) {
- bfin_write_TWI_XMT_DATA8(*(iface->transPtr++));
+ write_XMT_DATA8(iface, *(iface->transPtr++));
iface->writeNum--;
}
/* start receive immediately after complete sending in
* combine mode.
*/
else if (iface->cur_mode == TWI_I2C_MODE_COMBINED)
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
- | MDIR | RSTART);
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) | MDIR | RSTART);
else if (iface->manual_stop)
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
- | STOP);
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) | STOP);
else if (iface->cur_mode == TWI_I2C_MODE_REPEAT &&
iface->cur_msg+1 < iface->msg_num)
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
- | RSTART);
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) | RSTART);
SSYNC();
/* Clear status */
- bfin_write_TWI_INT_STAT(XMTSERV);
+ write_INT_STAT(iface, XMTSERV);
SSYNC();
}
if (twi_int_status & RCVSERV) {
if (iface->readNum > 0) {
/* Receive next data */
- *(iface->transPtr) = bfin_read_TWI_RCV_DATA8();
+ *(iface->transPtr) = read_RCV_DATA8(iface);
if (iface->cur_mode == TWI_I2C_MODE_COMBINED) {
/* Change combine mode into sub mode after
* read first data.
iface->transPtr++;
iface->readNum--;
} else if (iface->manual_stop) {
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
- | STOP);
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) | STOP);
SSYNC();
} else if (iface->cur_mode == TWI_I2C_MODE_REPEAT &&
iface->cur_msg+1 < iface->msg_num) {
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
- | RSTART);
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) | RSTART);
SSYNC();
}
/* Clear interrupt source */
- bfin_write_TWI_INT_STAT(RCVSERV);
+ write_INT_STAT(iface, RCVSERV);
SSYNC();
}
if (twi_int_status & MERR) {
- bfin_write_TWI_INT_STAT(MERR);
- bfin_write_TWI_INT_MASK(0);
- bfin_write_TWI_MASTER_STAT(0x3e);
- bfin_write_TWI_MASTER_CTL(0);
+ write_INT_STAT(iface, MERR);
+ write_INT_MASK(iface, 0);
+ write_MASTER_STAT(iface, 0x3e);
+ write_MASTER_CTL(iface, 0);
SSYNC();
iface->result = -EIO;
/* if both err and complete int stats are set, return proper
* results.
*/
if (twi_int_status & MCOMP) {
- bfin_write_TWI_INT_STAT(MCOMP);
- bfin_write_TWI_INT_MASK(0);
- bfin_write_TWI_MASTER_CTL(0);
+ write_INT_STAT(iface, MCOMP);
+ write_INT_MASK(iface, 0);
+ write_MASTER_CTL(iface, 0);
SSYNC();
/* If it is a quick transfer, only address bug no data,
* not an err, return 1.
return;
}
if (twi_int_status & MCOMP) {
- bfin_write_TWI_INT_STAT(MCOMP);
+ write_INT_STAT(iface, MCOMP);
SSYNC();
if (iface->cur_mode == TWI_I2C_MODE_COMBINED) {
if (iface->readNum == 0) {
*/
iface->readNum = 1;
iface->manual_stop = 1;
- bfin_write_TWI_MASTER_CTL(
- bfin_read_TWI_MASTER_CTL()
- | (0xff << 6));
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) | (0xff << 6));
} else {
/* set the readd number in other
* combine mode.
*/
- bfin_write_TWI_MASTER_CTL(
- (bfin_read_TWI_MASTER_CTL() &
+ write_MASTER_CTL(iface,
+ (read_MASTER_CTL(iface) &
(~(0xff << 6))) |
- ( iface->readNum << 6));
+ (iface->readNum << 6));
}
/* remove restart bit and enable master receive */
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() &
- ~RSTART);
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() |
- MEN | MDIR);
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) & ~RSTART);
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) | MEN | MDIR);
SSYNC();
} else if (iface->cur_mode == TWI_I2C_MODE_REPEAT &&
iface->cur_msg+1 < iface->msg_num) {
iface->writeNum = iface->readNum =
iface->pmsg[iface->cur_msg].len;
/* Set Transmit device address */
- bfin_write_TWI_MASTER_ADDR(
+ write_MASTER_ADDR(iface,
iface->pmsg[iface->cur_msg].addr);
if (iface->pmsg[iface->cur_msg].flags & I2C_M_RD)
iface->read_write = I2C_SMBUS_READ;
iface->read_write = I2C_SMBUS_WRITE;
/* Transmit first data */
if (iface->writeNum > 0) {
- bfin_write_TWI_XMT_DATA8(
+ write_XMT_DATA8(iface,
*(iface->transPtr++));
iface->writeNum--;
SSYNC();
}
if (iface->pmsg[iface->cur_msg].len <= 255)
- bfin_write_TWI_MASTER_CTL(
+ write_MASTER_CTL(iface,
iface->pmsg[iface->cur_msg].len << 6);
else {
- bfin_write_TWI_MASTER_CTL(0xff << 6);
+ write_MASTER_CTL(iface, 0xff << 6);
iface->manual_stop = 1;
}
/* remove restart bit and enable master receive */
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() &
- ~RSTART);
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() |
+ write_MASTER_CTL(iface,
+ read_MASTER_CTL(iface) & ~RSTART);
+ write_MASTER_CTL(iface, read_MASTER_CTL(iface) |
MEN | ((iface->read_write == I2C_SMBUS_READ) ?
MDIR : 0));
SSYNC();
} else {
iface->result = 1;
- bfin_write_TWI_INT_MASK(0);
- bfin_write_TWI_MASTER_CTL(0);
+ write_INT_MASK(iface, 0);
+ write_MASTER_CTL(iface, 0);
SSYNC();
complete(&iface->complete);
}
struct i2c_msg *pmsg;
int rc = 0;
- if (!(bfin_read_TWI_CONTROL() & TWI_ENA))
+ if (!(read_CONTROL(iface) & TWI_ENA))
return -ENXIO;
- while (bfin_read_TWI_MASTER_STAT() & BUSBUSY) {
+ while (read_MASTER_STAT(iface) & BUSBUSY)
yield();
- }
iface->pmsg = msgs;
iface->msg_num = num;
iface->result = 0;
iface->timeout_count = 10;
/* Set Transmit device address */
- bfin_write_TWI_MASTER_ADDR(pmsg->addr);
+ write_MASTER_ADDR(iface, pmsg->addr);
/* FIFO Initiation. Data in FIFO should be
* discarded before start a new operation.
*/
- bfin_write_TWI_FIFO_CTL(0x3);
+ write_FIFO_CTL(iface, 0x3);
SSYNC();
- bfin_write_TWI_FIFO_CTL(0);
+ write_FIFO_CTL(iface, 0);
SSYNC();
if (pmsg->flags & I2C_M_RD)
iface->read_write = I2C_SMBUS_WRITE;
/* Transmit first data */
if (iface->writeNum > 0) {
- bfin_write_TWI_XMT_DATA8(*(iface->transPtr++));
+ write_XMT_DATA8(iface, *(iface->transPtr++));
iface->writeNum--;
SSYNC();
}
}
/* clear int stat */
- bfin_write_TWI_INT_STAT(MERR | MCOMP | XMTSERV | RCVSERV);
+ write_INT_STAT(iface, MERR | MCOMP | XMTSERV | RCVSERV);
/* Interrupt mask . Enable XMT, RCV interrupt */
- bfin_write_TWI_INT_MASK(MCOMP | MERR | RCVSERV | XMTSERV);
+ write_INT_MASK(iface, MCOMP | MERR | RCVSERV | XMTSERV);
SSYNC();
if (pmsg->len <= 255)
- bfin_write_TWI_MASTER_CTL(pmsg->len << 6);
+ write_MASTER_CTL(iface, pmsg->len << 6);
else {
- bfin_write_TWI_MASTER_CTL(0xff << 6);
+ write_MASTER_CTL(iface, 0xff << 6);
iface->manual_stop = 1;
}
add_timer(&iface->timeout_timer);
/* Master enable */
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
+ write_MASTER_CTL(iface, read_MASTER_CTL(iface) | MEN |
((iface->read_write == I2C_SMBUS_READ) ? MDIR : 0) |
((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ > 100) ? FAST : 0));
SSYNC();
struct bfin_twi_iface *iface = adap->algo_data;
int rc = 0;
- if (!(bfin_read_TWI_CONTROL() & TWI_ENA))
+ if (!(read_CONTROL(iface) & TWI_ENA))
return -ENXIO;
- while (bfin_read_TWI_MASTER_STAT() & BUSBUSY) {
+ while (read_MASTER_STAT(iface) & BUSBUSY)
yield();
- }
iface->writeNum = 0;
iface->readNum = 0;
/* FIFO Initiation. Data in FIFO should be discarded before
* start a new operation.
*/
- bfin_write_TWI_FIFO_CTL(0x3);
+ write_FIFO_CTL(iface, 0x3);
SSYNC();
- bfin_write_TWI_FIFO_CTL(0);
+ write_FIFO_CTL(iface, 0);
/* clear int stat */
- bfin_write_TWI_INT_STAT(MERR|MCOMP|XMTSERV|RCVSERV);
+ write_INT_STAT(iface, MERR | MCOMP | XMTSERV | RCVSERV);
/* Set Transmit device address */
- bfin_write_TWI_MASTER_ADDR(addr);
+ write_MASTER_ADDR(iface, addr);
SSYNC();
iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
switch (iface->cur_mode) {
case TWI_I2C_MODE_STANDARDSUB:
- bfin_write_TWI_XMT_DATA8(iface->command);
- bfin_write_TWI_INT_MASK(MCOMP | MERR |
+ write_XMT_DATA8(iface, iface->command);
+ write_INT_MASK(iface, MCOMP | MERR |
((iface->read_write == I2C_SMBUS_READ) ?
RCVSERV : XMTSERV));
SSYNC();
if (iface->writeNum + 1 <= 255)
- bfin_write_TWI_MASTER_CTL((iface->writeNum + 1) << 6);
+ write_MASTER_CTL(iface, (iface->writeNum + 1) << 6);
else {
- bfin_write_TWI_MASTER_CTL(0xff << 6);
+ write_MASTER_CTL(iface, 0xff << 6);
iface->manual_stop = 1;
}
/* Master enable */
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
+ write_MASTER_CTL(iface, read_MASTER_CTL(iface) | MEN |
((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ>100) ? FAST : 0));
break;
case TWI_I2C_MODE_COMBINED:
- bfin_write_TWI_XMT_DATA8(iface->command);
- bfin_write_TWI_INT_MASK(MCOMP | MERR | RCVSERV | XMTSERV);
+ write_XMT_DATA8(iface, iface->command);
+ write_INT_MASK(iface, MCOMP | MERR | RCVSERV | XMTSERV);
SSYNC();
if (iface->writeNum > 0)
- bfin_write_TWI_MASTER_CTL((iface->writeNum + 1) << 6);
+ write_MASTER_CTL(iface, (iface->writeNum + 1) << 6);
else
- bfin_write_TWI_MASTER_CTL(0x1 << 6);
+ write_MASTER_CTL(iface, 0x1 << 6);
/* Master enable */
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
+ write_MASTER_CTL(iface, read_MASTER_CTL(iface) | MEN |
((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ>100) ? FAST : 0));
break;
default:
- bfin_write_TWI_MASTER_CTL(0);
+ write_MASTER_CTL(iface, 0);
if (size != I2C_SMBUS_QUICK) {
/* Don't access xmit data register when this is a
* read operation.
*/
if (iface->read_write != I2C_SMBUS_READ) {
if (iface->writeNum > 0) {
- bfin_write_TWI_XMT_DATA8(*(iface->transPtr++));
+ write_XMT_DATA8(iface,
+ *(iface->transPtr++));
if (iface->writeNum <= 255)
- bfin_write_TWI_MASTER_CTL(iface->writeNum << 6);
+ write_MASTER_CTL(iface,
+ iface->writeNum << 6);
else {
- bfin_write_TWI_MASTER_CTL(0xff << 6);
+ write_MASTER_CTL(iface,
+ 0xff << 6);
iface->manual_stop = 1;
}
iface->writeNum--;
} else {
- bfin_write_TWI_XMT_DATA8(iface->command);
- bfin_write_TWI_MASTER_CTL(1 << 6);
+ write_XMT_DATA8(iface, iface->command);
+ write_MASTER_CTL(iface, 1 << 6);
}
} else {
if (iface->readNum > 0 && iface->readNum <= 255)
- bfin_write_TWI_MASTER_CTL(iface->readNum << 6);
+ write_MASTER_CTL(iface,
+ iface->readNum << 6);
else if (iface->readNum > 255) {
- bfin_write_TWI_MASTER_CTL(0xff << 6);
+ write_MASTER_CTL(iface, 0xff << 6);
iface->manual_stop = 1;
} else {
del_timer(&iface->timeout_timer);
}
}
}
- bfin_write_TWI_INT_MASK(MCOMP | MERR |
+ write_INT_MASK(iface, MCOMP | MERR |
((iface->read_write == I2C_SMBUS_READ) ?
RCVSERV : XMTSERV));
SSYNC();
/* Master enable */
- bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
+ write_MASTER_CTL(iface, read_MASTER_CTL(iface) | MEN |
((iface->read_write == I2C_SMBUS_READ) ? MDIR : 0) |
((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ > 100) ? FAST : 0));
break;
static int i2c_bfin_twi_suspend(struct platform_device *dev, pm_message_t state)
{
-/* struct bfin_twi_iface *iface = platform_get_drvdata(dev);*/
+ struct bfin_twi_iface *iface = platform_get_drvdata(dev);
/* Disable TWI */
- bfin_write_TWI_CONTROL(bfin_read_TWI_CONTROL() & ~TWI_ENA);
+ write_CONTROL(iface, read_CONTROL(iface) & ~TWI_ENA);
SSYNC();
return 0;
static int i2c_bfin_twi_resume(struct platform_device *dev)
{
-/* struct bfin_twi_iface *iface = platform_get_drvdata(dev);*/
+ struct bfin_twi_iface *iface = platform_get_drvdata(dev);
/* Enable TWI */
- bfin_write_TWI_CONTROL(bfin_read_TWI_CONTROL() | TWI_ENA);
+ write_CONTROL(iface, read_CONTROL(iface) | TWI_ENA);
SSYNC();
return 0;
}
-static int i2c_bfin_twi_probe(struct platform_device *dev)
+static int i2c_bfin_twi_probe(struct platform_device *pdev)
{
- struct bfin_twi_iface *iface = &twi_iface;
+ struct bfin_twi_iface *iface;
struct i2c_adapter *p_adap;
+ struct resource *res;
int rc;
+ iface = kzalloc(sizeof(struct bfin_twi_iface), GFP_KERNEL);
+ if (!iface) {
+ dev_err(&pdev->dev, "Cannot allocate memory\n");
+ rc = -ENOMEM;
+ goto out_error_nomem;
+ }
+
spin_lock_init(&(iface->lock));
init_completion(&(iface->complete));
- iface->irq = IRQ_TWI;
+
+ /* Find and map our resources */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
+ rc = -ENOENT;
+ goto out_error_get_res;
+ }
+
+ iface->regs_base = ioremap(res->start, res->end - res->start + 1);
+ if (iface->regs_base == NULL) {
+ dev_err(&pdev->dev, "Cannot map IO\n");
+ rc = -ENXIO;
+ goto out_error_ioremap;
+ }
+
+ iface->irq = platform_get_irq(pdev, 0);
+ if (iface->irq < 0) {
+ dev_err(&pdev->dev, "No IRQ specified\n");
+ rc = -ENOENT;
+ goto out_error_no_irq;
+ }
init_timer(&(iface->timeout_timer));
iface->timeout_timer.function = bfin_twi_timeout;
p_adap = &iface->adap;
p_adap->id = I2C_HW_BLACKFIN;
- p_adap->nr = dev->id;
- strlcpy(p_adap->name, dev->name, sizeof(p_adap->name));
+ p_adap->nr = pdev->id;
+ strlcpy(p_adap->name, pdev->name, sizeof(p_adap->name));
p_adap->algo = &bfin_twi_algorithm;
p_adap->algo_data = iface;
p_adap->class = I2C_CLASS_ALL;
- p_adap->dev.parent = &dev->dev;
+ p_adap->dev.parent = &pdev->dev;
rc = request_irq(iface->irq, bfin_twi_interrupt_entry,
- IRQF_DISABLED, dev->name, iface);
+ IRQF_DISABLED, pdev->name, iface);
if (rc) {
- dev_err(&(p_adap->dev), "i2c-bfin-twi: can't get IRQ %d !\n",
- iface->irq);
- return -ENODEV;
+ dev_err(&pdev->dev, "Can't get IRQ %d !\n", iface->irq);
+ rc = -ENODEV;
+ goto out_error_req_irq;
}
/* Set TWI internal clock as 10MHz */
- bfin_write_TWI_CONTROL(((get_sclk() / 1024 / 1024 + 5) / 10) & 0x7F);
+ write_CONTROL(iface, ((get_sclk() / 1024 / 1024 + 5) / 10) & 0x7F);
/* Set Twi interface clock as specified */
- bfin_write_TWI_CLKDIV((( 5*1024 / CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ )
- << 8) | (( 5*1024 / CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ )
+ write_CLKDIV(iface, ((5*1024 / CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ)
+ << 8) | ((5*1024 / CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ)
& 0xFF));
/* Enable TWI */
- bfin_write_TWI_CONTROL(bfin_read_TWI_CONTROL() | TWI_ENA);
+ write_CONTROL(iface, read_CONTROL(iface) | TWI_ENA);
SSYNC();
rc = i2c_add_numbered_adapter(p_adap);
- if (rc < 0)
- free_irq(iface->irq, iface);
- else
- platform_set_drvdata(dev, iface);
+ if (rc < 0) {
+ dev_err(&pdev->dev, "Can't add i2c adapter!\n");
+ goto out_error_add_adapter;
+ }
+
+ platform_set_drvdata(pdev, iface);
+ dev_info(&pdev->dev, "Blackfin I2C TWI controller, regs_base@%p\n",
+ iface->regs_base);
+
+ return 0;
+
+out_error_add_adapter:
+ free_irq(iface->irq, iface);
+out_error_req_irq:
+out_error_no_irq:
+ iounmap(iface->regs_base);
+out_error_ioremap:
+out_error_get_res:
+ kfree(iface);
+out_error_nomem:
return rc;
}
i2c_del_adapter(&(iface->adap));
free_irq(iface->irq, iface);
+ iounmap(iface->regs_base);
+ kfree(iface);
return 0;
}
static int __init i2c_bfin_twi_init(void)
{
- pr_info("I2C: Blackfin I2C TWI driver\n");
-
return platform_driver_register(&i2c_bfin_twi_driver);
}
projects / linux-2.6 / commitdiff