i2c-bfin-twi: Add platform_resource interface to support multi-port TWI controllers

 - Dynamic alloc the resource of TWI driver data according to board information
 - TWI register read/write accessor based on dynamic regs_base
 - Support TWI0/TWI1 for BF54x

Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

2 files changed, 177 insertions, 108 deletions

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 495c971ce5b..7d538ddfd37 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -100,7 +100,7 @@ config I2C_AU1550
 
 config I2C_BLACKFIN_TWI
         tristate "Blackfin TWI I2C support"
-        depends on BF534 || BF536 || BF537
+        depends on BF534 || BF536 || BF537 || BF54x
         help
           This is the TWI I2C device driver for Blackfin 534/536/537/54x.
           This driver can also be built as a module.  If so, the module
diff --git a/drivers/i2c/busses/i2c-bfin-twi.c b/drivers/i2c/busses/i2c-bfin-twi.c
index 86956a8f0ae..f2b558f17ca 100644
--- a/drivers/i2c/busses/i2c-bfin-twi.c
+++ b/drivers/i2c/busses/i2c-bfin-twi.c
@@ -62,43 +62,66 @@ struct bfin_twi_iface {
         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.
@@ -113,33 +136,33 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
                         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.
@@ -156,7 +179,7 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
                 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) {
@@ -165,23 +188,22 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
                                  */
                                 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) {
@@ -190,7 +212,7 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
                         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;
@@ -198,7 +220,7 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
                                 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();
@@ -206,23 +228,23 @@ static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
                         }
 
                         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);
                 }
@@ -272,12 +294,11 @@ static int bfin_twi_master_xfer(struct i2c_adapter *adap,
         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;
@@ -296,14 +317,14 @@ static int bfin_twi_master_xfer(struct i2c_adapter *adap,
         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)
@@ -312,23 +333,23 @@ static int bfin_twi_master_xfer(struct i2c_adapter *adap,
                 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;
         }
 
@@ -336,7 +357,7 @@ static int bfin_twi_master_xfer(struct i2c_adapter *adap,
         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();
@@ -362,12 +383,11 @@ int bfin_twi_smbus_xfer(struct i2c_adapter *adap, u16 addr,
         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;
@@ -439,15 +459,15 @@ int bfin_twi_smbus_xfer(struct i2c_adapter *adap, u16 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);
 
         /* 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;
@@ -455,60 +475,64 @@ int bfin_twi_smbus_xfer(struct i2c_adapter *adap, u16 addr,
 
         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);
@@ -516,13 +540,13 @@ int bfin_twi_smbus_xfer(struct i2c_adapter *adap, u16 addr,
                                 }
                         }
                 }
-                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;
@@ -557,10 +581,10 @@ static struct i2c_algorithm bfin_twi_algorithm = {
 
 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;
@@ -568,24 +592,53 @@ static int i2c_bfin_twi_suspend(struct platform_device *dev, pm_message_t state)
 
 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;
@@ -593,39 +646,55 @@ static int i2c_bfin_twi_probe(struct platform_device *dev)
 
         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;
 }
 
@@ -637,6 +706,8 @@ static int i2c_bfin_twi_remove(struct platform_device *pdev)
 
         i2c_del_adapter(&(iface->adap));
         free_irq(iface->irq, iface);
+        iounmap(iface->regs_base);
+        kfree(iface);
 
         return 0;
 }
@@ -654,8 +725,6 @@ static struct platform_driver i2c_bfin_twi_driver = {
 
 static int __init i2c_bfin_twi_init(void)
 {
-        pr_info("I2C: Blackfin I2C TWI driver\n");
-
         return platform_driver_register(&i2c_bfin_twi_driver);
 }