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With that, remove not anymore true comment. Signed-off-by: Andy Shevchenko --- drivers/i2c/busses/i2c-isch.c | 145 ++++++++++++++++++---------------- 1 file changed, 75 insertions(+), 70 deletions(-) diff --git a/drivers/i2c/busses/i2c-isch.c b/drivers/i2c/busses/i2c-isch.c index 0eaefb7b8bca..0fe7c9d1dd0d 100644 --- a/drivers/i2c/busses/i2c-isch.c +++ b/drivers/i2c/busses/i2c-isch.c @@ -9,16 +9,14 @@ */ -/* - Supports: - Intel SCH chipsets (AF82US15W, AF82US15L, AF82UL11L) - Note: we assume there can only be one device, with one SMBus interface. -*/ +/* Supports: Intel SCH chipsets (AF82US15W, AF82US15L, AF82UL11L) */ #include #include #include +#include #include +#include #include #include #include @@ -46,31 +44,33 @@ #define SCH_WORD_DATA 0x03 #define SCH_BLOCK_DATA 0x05 -static struct i2c_adapter sch_adapter; -static void __iomem *sch_smba; +struct sch_i2c { + struct i2c_adapter adapter; + void __iomem *smba; +}; static int backbone_speed = 33000; /* backbone speed in kHz */ module_param(backbone_speed, int, S_IRUSR | S_IWUSR); MODULE_PARM_DESC(backbone_speed, "Backbone speed in kHz, (default = 33000)"); -static inline u8 sch_io_rd8(void __iomem *smba, unsigned int offset) +static inline u8 sch_io_rd8(struct sch_i2c *priv, unsigned int offset) { - return ioread8(smba + offset); + return ioread8(priv->smba + offset); } -static inline void sch_io_wr8(void __iomem *smba, unsigned int offset, u8 value) +static inline void sch_io_wr8(struct sch_i2c *priv, unsigned int offset, u8 value) { - iowrite8(value, smba + offset); + iowrite8(value, priv->smba + offset); } -static inline u16 sch_io_rd16(void __iomem *smba, unsigned int offset) +static inline u16 sch_io_rd16(struct sch_i2c *priv, unsigned int offset) { - return ioread16(smba + offset); + return ioread16(priv->smba + offset); } -static inline void sch_io_wr16(void __iomem *smba, unsigned int offset, u16 value) +static inline void sch_io_wr16(struct sch_i2c *priv, unsigned int offset, u16 value) { - iowrite16(value, smba + offset); + iowrite16(value, priv->smba + offset); } /* @@ -80,26 +80,27 @@ static inline void sch_io_wr16(void __iomem *smba, unsigned int offset, u16 valu */ static int sch_transaction(struct i2c_adapter *adap) { + struct sch_i2c *priv = container_of(adap, struct sch_i2c, adapter); int temp; int result = 0; int retries = 0; dev_dbg(&adap->dev, "Transaction (pre): CNT=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", - sch_io_rd8(sch_smba, SMBHSTCNT), sch_io_rd8(sch_smba, SMBHSTCMD), - sch_io_rd8(sch_smba, SMBHSTADD), - sch_io_rd8(sch_smba, SMBHSTDAT0), sch_io_rd8(sch_smba, SMBHSTDAT1)); + sch_io_rd8(priv, SMBHSTCNT), sch_io_rd8(priv, SMBHSTCMD), + sch_io_rd8(priv, SMBHSTADD), + sch_io_rd8(priv, SMBHSTDAT0), sch_io_rd8(priv, SMBHSTDAT1)); /* Make sure the SMBus host is ready to start transmitting */ - temp = sch_io_rd8(sch_smba, SMBHSTSTS) & 0x0f; + temp = sch_io_rd8(priv, SMBHSTSTS) & 0x0f; if (temp) { /* Can not be busy since we checked it in sch_access */ if (temp & 0x01) dev_dbg(&adap->dev, "Completion (%02x). Clear...\n", temp); if (temp & 0x06) dev_dbg(&adap->dev, "SMBus error (%02x). Resetting...\n", temp); - sch_io_wr8(sch_smba, SMBHSTSTS, temp); - temp = sch_io_rd8(sch_smba, SMBHSTSTS) & 0x0f; + sch_io_wr8(priv, SMBHSTSTS, temp); + temp = sch_io_rd8(priv, SMBHSTSTS) & 0x0f; if (temp) { dev_err(&adap->dev, "SMBus is not ready: (%02x)\n", temp); return -EAGAIN; @@ -107,13 +108,13 @@ static int sch_transaction(struct i2c_adapter *adap) } /* start the transaction by setting bit 4 */ - temp = sch_io_rd8(sch_smba, SMBHSTCNT); + temp = sch_io_rd8(priv, SMBHSTCNT); temp |= 0x10; - sch_io_wr8(sch_smba, SMBHSTCNT, temp); + sch_io_wr8(priv, SMBHSTCNT, temp); do { usleep_range(100, 200); - temp = sch_io_rd8(sch_smba, SMBHSTSTS) & 0x0f; + temp = sch_io_rd8(priv, SMBHSTSTS) & 0x0f; } while ((temp & 0x08) && (retries++ < MAX_RETRIES)); /* If the SMBus is still busy, we give up */ @@ -129,8 +130,8 @@ static int sch_transaction(struct i2c_adapter *adap) dev_err(&adap->dev, "Error: no response!\n"); } else if (temp & 0x01) { dev_dbg(&adap->dev, "Post complete!\n"); - sch_io_wr8(sch_smba, SMBHSTSTS, temp); - temp = sch_io_rd8(sch_smba, SMBHSTSTS) & 0x07; + sch_io_wr8(priv, SMBHSTSTS, temp); + temp = sch_io_rd8(priv, SMBHSTSTS) & 0x07; if (temp & 0x06) { /* Completion clear failed */ dev_dbg(&adap->dev, @@ -141,9 +142,9 @@ static int sch_transaction(struct i2c_adapter *adap) dev_dbg(&adap->dev, "No such address.\n"); } dev_dbg(&adap->dev, "Transaction (post): CNT=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", - sch_io_rd8(sch_smba, SMBHSTCNT), sch_io_rd8(sch_smba, SMBHSTCMD), - sch_io_rd8(sch_smba, SMBHSTADD), - sch_io_rd8(sch_smba, SMBHSTDAT0), sch_io_rd8(sch_smba, SMBHSTDAT1)); + sch_io_rd8(priv, SMBHSTCNT), sch_io_rd8(priv, SMBHSTCMD), + sch_io_rd8(priv, SMBHSTADD), + sch_io_rd8(priv, SMBHSTDAT0), sch_io_rd8(priv, SMBHSTDAT1)); return result; } @@ -158,15 +159,16 @@ static s32 sch_access(struct i2c_adapter *adap, u16 addr, unsigned short flags, char read_write, u8 command, int size, union i2c_smbus_data *data) { + struct sch_i2c *priv = container_of(adap, struct sch_i2c, adapter); int i, len, temp, rc; /* Make sure the SMBus host is not busy */ - temp = sch_io_rd8(sch_smba, SMBHSTSTS) & 0x0f; + temp = sch_io_rd8(priv, SMBHSTSTS) & 0x0f; if (temp & 0x08) { dev_dbg(&adap->dev, "SMBus busy (%02x)\n", temp); return -EAGAIN; } - temp = sch_io_rd16(sch_smba, SMBHSTCLK); + temp = sch_io_rd16(priv, SMBHSTCLK); if (!temp) { /* * We can't determine if we have 33 or 25 MHz clock for @@ -175,47 +177,47 @@ static s32 sch_access(struct i2c_adapter *adap, u16 addr, * run ~75 kHz instead which should do no harm. */ dev_notice(&adap->dev, "Clock divider uninitialized. Setting defaults\n"); - sch_io_wr16(sch_smba, SMBHSTCLK, backbone_speed / (4 * 100)); + sch_io_wr16(priv, SMBHSTCLK, backbone_speed / (4 * 100)); } dev_dbg(&adap->dev, "access size: %d %s\n", size, str_read_write(read_write)); switch (size) { case I2C_SMBUS_QUICK: - sch_io_wr8(sch_smba, SMBHSTADD, (addr << 1) | read_write); + sch_io_wr8(priv, SMBHSTADD, (addr << 1) | read_write); size = SCH_QUICK; break; case I2C_SMBUS_BYTE: - sch_io_wr8(sch_smba, SMBHSTADD, (addr << 1) | read_write); + sch_io_wr8(priv, SMBHSTADD, (addr << 1) | read_write); if (read_write == I2C_SMBUS_WRITE) - sch_io_wr8(sch_smba, SMBHSTCMD, command); + sch_io_wr8(priv, SMBHSTCMD, command); size = SCH_BYTE; break; case I2C_SMBUS_BYTE_DATA: - sch_io_wr8(sch_smba, SMBHSTADD, (addr << 1) | read_write); - sch_io_wr8(sch_smba, SMBHSTCMD, command); + sch_io_wr8(priv, SMBHSTADD, (addr << 1) | read_write); + sch_io_wr8(priv, SMBHSTCMD, command); if (read_write == I2C_SMBUS_WRITE) - sch_io_wr8(sch_smba, SMBHSTDAT0, data->byte); + sch_io_wr8(priv, SMBHSTDAT0, data->byte); size = SCH_BYTE_DATA; break; case I2C_SMBUS_WORD_DATA: - sch_io_wr8(sch_smba, SMBHSTADD, (addr << 1) | read_write); - sch_io_wr8(sch_smba, SMBHSTCMD, command); + sch_io_wr8(priv, SMBHSTADD, (addr << 1) | read_write); + sch_io_wr8(priv, SMBHSTCMD, command); if (read_write == I2C_SMBUS_WRITE) { - sch_io_wr8(sch_smba, SMBHSTDAT0, data->word >> 0); - sch_io_wr8(sch_smba, SMBHSTDAT1, data->word >> 8); + sch_io_wr8(priv, SMBHSTDAT0, data->word >> 0); + sch_io_wr8(priv, SMBHSTDAT1, data->word >> 8); } size = SCH_WORD_DATA; break; case I2C_SMBUS_BLOCK_DATA: - sch_io_wr8(sch_smba, SMBHSTADD, (addr << 1) | read_write); - sch_io_wr8(sch_smba, SMBHSTCMD, command); + sch_io_wr8(priv, SMBHSTADD, (addr << 1) | read_write); + sch_io_wr8(priv, SMBHSTCMD, command); if (read_write == I2C_SMBUS_WRITE) { len = data->block[0]; if (len == 0 || len > I2C_SMBUS_BLOCK_MAX) return -EINVAL; - sch_io_wr8(sch_smba, SMBHSTDAT0, len); + sch_io_wr8(priv, SMBHSTDAT0, len); for (i = 1; i <= len; i++) - sch_io_wr8(sch_smba, SMBBLKDAT + i - 1, data->block[i]); + sch_io_wr8(priv, SMBBLKDAT + i - 1, data->block[i]); } size = SCH_BLOCK_DATA; break; @@ -225,9 +227,9 @@ static s32 sch_access(struct i2c_adapter *adap, u16 addr, } dev_dbg(&adap->dev, "write size %d to 0x%04x\n", size, SMBHSTCNT); - temp = sch_io_rd8(sch_smba, SMBHSTCNT); + temp = sch_io_rd8(priv, SMBHSTCNT); temp = (temp & 0xb0) | (size & 0x7); - sch_io_wr8(sch_smba, SMBHSTCNT, temp); + sch_io_wr8(priv, SMBHSTCNT, temp); rc = sch_transaction(adap); if (rc) /* Error in transaction */ @@ -239,18 +241,18 @@ static s32 sch_access(struct i2c_adapter *adap, u16 addr, switch (size) { case SCH_BYTE: case SCH_BYTE_DATA: - data->byte = sch_io_rd8(sch_smba, SMBHSTDAT0); + data->byte = sch_io_rd8(priv, SMBHSTDAT0); break; case SCH_WORD_DATA: - data->word = (sch_io_rd8(sch_smba, SMBHSTDAT0) << 0) + - (sch_io_rd8(sch_smba, SMBHSTDAT1) << 8); + data->word = (sch_io_rd8(priv, SMBHSTDAT0) << 0) + + (sch_io_rd8(priv, SMBHSTDAT1) << 8); break; case SCH_BLOCK_DATA: - data->block[0] = sch_io_rd8(sch_smba, SMBHSTDAT0); + data->block[0] = sch_io_rd8(priv, SMBHSTDAT0); if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX) return -EPROTO; for (i = 1; i <= data->block[0]; i++) - data->block[i] = sch_io_rd8(sch_smba, SMBBLKDAT + i - 1); + data->block[i] = sch_io_rd8(priv, SMBBLKDAT + i - 1); break; } return 0; @@ -268,46 +270,49 @@ static const struct i2c_algorithm smbus_algorithm = { .functionality = sch_func, }; -static struct i2c_adapter sch_adapter = { - .owner = THIS_MODULE, - .class = I2C_CLASS_HWMON, - .algo = &smbus_algorithm, -}; - static int smbus_sch_probe(struct platform_device *dev) { + struct sch_i2c *priv; struct resource *res; int retval; + priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + res = platform_get_resource(dev, IORESOURCE_IO, 0); if (!res) return -EBUSY; - sch_smba = devm_ioport_map(&dev->dev, res->start, resource_size(res)); - if (!sch_smba) { + priv->smba = devm_ioport_map(&dev->dev, res->start, resource_size(res)); + if (!priv->smba) { dev_err(&dev->dev, "SMBus region %pR already in use!\n", res); return -EBUSY; } /* set up the sysfs linkage to our parent device */ - sch_adapter.dev.parent = &dev->dev; + priv->adapter.dev.parent = &dev->dev; + priv->adapter.owner = THIS_MODULE, + priv->adapter.class = I2C_CLASS_HWMON, + priv->adapter.algo = &smbus_algorithm, - snprintf(sch_adapter.name, sizeof(sch_adapter.name), + snprintf(priv->adapter.name, sizeof(priv->adapter.name), "SMBus SCH adapter at %04x", (unsigned short)res->start); - retval = i2c_add_adapter(&sch_adapter); + retval = i2c_add_adapter(&priv->adapter); if (retval) - sch_smba = NULL; + return retval; - return retval; + platform_set_drvdata(dev, priv); + + return 0; } static void smbus_sch_remove(struct platform_device *pdev) { - if (sch_smba) { - i2c_del_adapter(&sch_adapter); - sch_smba = NULL; - } + struct sch_i2c *priv = platform_get_drvdata(pdev); + + i2c_del_adapter(&priv->adapter); } static struct platform_driver smbus_sch_driver = {