diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/i2c/busses/i2c-ali1563.c | 442 |
1 files changed, 442 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-ali1563.c b/drivers/i2c/busses/i2c-ali1563.c new file mode 100644 index 000000000..55a9e93fb --- /dev/null +++ b/drivers/i2c/busses/i2c-ali1563.c @@ -0,0 +1,442 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge + * + * Copyright (C) 2004 Patrick Mochel + * 2005 Rudolf Marek <r.marek@assembler.cz> + * + * The 1563 southbridge is deceptively similar to the 1533, with a + * few notable exceptions. One of those happens to be the fact they + * upgraded the i2c core to be 2.0 compliant, and happens to be almost + * identical to the i2c controller found in the Intel 801 south + * bridges. + * + * This driver is based on a mix of the 15x3, 1535, and i801 drivers, + * with a little help from the ALi 1563 spec. + */ + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/pci.h> +#include <linux/acpi.h> + +#define ALI1563_MAX_TIMEOUT 500 +#define ALI1563_SMBBA 0x80 +#define ALI1563_SMB_IOEN 1 +#define ALI1563_SMB_HOSTEN 2 +#define ALI1563_SMB_IOSIZE 16 + +#define SMB_HST_STS (ali1563_smba + 0) +#define SMB_HST_CNTL1 (ali1563_smba + 1) +#define SMB_HST_CNTL2 (ali1563_smba + 2) +#define SMB_HST_CMD (ali1563_smba + 3) +#define SMB_HST_ADD (ali1563_smba + 4) +#define SMB_HST_DAT0 (ali1563_smba + 5) +#define SMB_HST_DAT1 (ali1563_smba + 6) +#define SMB_BLK_DAT (ali1563_smba + 7) + +#define HST_STS_BUSY 0x01 +#define HST_STS_INTR 0x02 +#define HST_STS_DEVERR 0x04 +#define HST_STS_BUSERR 0x08 +#define HST_STS_FAIL 0x10 +#define HST_STS_DONE 0x80 +#define HST_STS_BAD 0x1c + + +#define HST_CNTL1_TIMEOUT 0x80 +#define HST_CNTL1_LAST 0x40 + +#define HST_CNTL2_KILL 0x04 +#define HST_CNTL2_START 0x40 +#define HST_CNTL2_QUICK 0x00 +#define HST_CNTL2_BYTE 0x01 +#define HST_CNTL2_BYTE_DATA 0x02 +#define HST_CNTL2_WORD_DATA 0x03 +#define HST_CNTL2_BLOCK 0x05 + + +#define HST_CNTL2_SIZEMASK 0x38 + +static struct pci_driver ali1563_pci_driver; +static unsigned short ali1563_smba; + +static int ali1563_transaction(struct i2c_adapter *a, int size) +{ + u32 data; + int timeout; + int status = -EIO; + + dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, " + "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", + inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2), + inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0), + inb_p(SMB_HST_DAT1)); + + data = inb_p(SMB_HST_STS); + if (data & HST_STS_BAD) { + dev_err(&a->dev, "ali1563: Trying to reset busy device\n"); + outb_p(data | HST_STS_BAD, SMB_HST_STS); + data = inb_p(SMB_HST_STS); + if (data & HST_STS_BAD) + return -EBUSY; + } + outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2); + + timeout = ALI1563_MAX_TIMEOUT; + do { + msleep(1); + } while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout); + + dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, " + "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", + inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2), + inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0), + inb_p(SMB_HST_DAT1)); + + if (timeout && !(data & HST_STS_BAD)) + return 0; + + if (!timeout) { + dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n"); + /* Issue 'kill' to host controller */ + outb_p(HST_CNTL2_KILL, SMB_HST_CNTL2); + data = inb_p(SMB_HST_STS); + status = -ETIMEDOUT; + } + + /* device error - no response, ignore the autodetection case */ + if (data & HST_STS_DEVERR) { + if (size != HST_CNTL2_QUICK) + dev_err(&a->dev, "Device error!\n"); + status = -ENXIO; + } + /* bus collision */ + if (data & HST_STS_BUSERR) { + dev_err(&a->dev, "Bus collision!\n"); + /* Issue timeout, hoping it helps */ + outb_p(HST_CNTL1_TIMEOUT, SMB_HST_CNTL1); + } + + if (data & HST_STS_FAIL) { + dev_err(&a->dev, "Cleaning fail after KILL!\n"); + outb_p(0x0, SMB_HST_CNTL2); + } + + return status; +} + +static int ali1563_block_start(struct i2c_adapter *a) +{ + u32 data; + int timeout; + int status = -EIO; + + dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, " + "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", + inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2), + inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0), + inb_p(SMB_HST_DAT1)); + + data = inb_p(SMB_HST_STS); + if (data & HST_STS_BAD) { + dev_warn(&a->dev, "ali1563: Trying to reset busy device\n"); + outb_p(data | HST_STS_BAD, SMB_HST_STS); + data = inb_p(SMB_HST_STS); + if (data & HST_STS_BAD) + return -EBUSY; + } + + /* Clear byte-ready bit */ + outb_p(data | HST_STS_DONE, SMB_HST_STS); + + /* Start transaction and wait for byte-ready bit to be set */ + outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2); + + timeout = ALI1563_MAX_TIMEOUT; + do { + msleep(1); + } while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout); + + dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, " + "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", + inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2), + inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0), + inb_p(SMB_HST_DAT1)); + + if (timeout && !(data & HST_STS_BAD)) + return 0; + + if (timeout == 0) + status = -ETIMEDOUT; + + if (data & HST_STS_DEVERR) + status = -ENXIO; + + dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n", + timeout ? "" : "Timeout ", + data & HST_STS_FAIL ? "Transaction Failed " : "", + data & HST_STS_BUSERR ? "No response or Bus Collision " : "", + data & HST_STS_DEVERR ? "Device Error " : "", + !(data & HST_STS_DONE) ? "Transaction Never Finished " : ""); + return status; +} + +static int ali1563_block(struct i2c_adapter *a, + union i2c_smbus_data *data, u8 rw) +{ + int i, len; + int error = 0; + + /* Do we need this? */ + outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1); + + if (rw == I2C_SMBUS_WRITE) { + len = data->block[0]; + if (len < 1) + len = 1; + else if (len > 32) + len = 32; + outb_p(len, SMB_HST_DAT0); + outb_p(data->block[1], SMB_BLK_DAT); + } else + len = 32; + + outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_BLOCK, SMB_HST_CNTL2); + + for (i = 0; i < len; i++) { + if (rw == I2C_SMBUS_WRITE) { + outb_p(data->block[i + 1], SMB_BLK_DAT); + error = ali1563_block_start(a); + if (error) + break; + } else { + error = ali1563_block_start(a); + if (error) + break; + if (i == 0) { + len = inb_p(SMB_HST_DAT0); + if (len < 1) + len = 1; + else if (len > 32) + len = 32; + } + data->block[i+1] = inb_p(SMB_BLK_DAT); + } + } + /* Do we need this? */ + outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1); + return error; +} + +static s32 ali1563_access(struct i2c_adapter *a, u16 addr, + unsigned short flags, char rw, u8 cmd, + int size, union i2c_smbus_data *data) +{ + int error = 0; + int timeout; + u32 reg; + + for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) { + reg = inb_p(SMB_HST_STS); + if (!(reg & HST_STS_BUSY)) + break; + } + if (!timeout) + dev_warn(&a->dev, "SMBus not idle. HST_STS = %02x\n", reg); + outb_p(0xff, SMB_HST_STS); + + /* Map the size to what the chip understands */ + switch (size) { + case I2C_SMBUS_QUICK: + size = HST_CNTL2_QUICK; + break; + case I2C_SMBUS_BYTE: + size = HST_CNTL2_BYTE; + break; + case I2C_SMBUS_BYTE_DATA: + size = HST_CNTL2_BYTE_DATA; + break; + case I2C_SMBUS_WORD_DATA: + size = HST_CNTL2_WORD_DATA; + break; + case I2C_SMBUS_BLOCK_DATA: + size = HST_CNTL2_BLOCK; + break; + default: + dev_warn(&a->dev, "Unsupported transaction %d\n", size); + error = -EOPNOTSUPP; + goto Done; + } + + outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD); + outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) | + (size << 3), SMB_HST_CNTL2); + + /* Write the command register */ + + switch (size) { + case HST_CNTL2_BYTE: + if (rw == I2C_SMBUS_WRITE) + /* Beware it uses DAT0 register and not CMD! */ + outb_p(cmd, SMB_HST_DAT0); + break; + case HST_CNTL2_BYTE_DATA: + outb_p(cmd, SMB_HST_CMD); + if (rw == I2C_SMBUS_WRITE) + outb_p(data->byte, SMB_HST_DAT0); + break; + case HST_CNTL2_WORD_DATA: + outb_p(cmd, SMB_HST_CMD); + if (rw == I2C_SMBUS_WRITE) { + outb_p(data->word & 0xff, SMB_HST_DAT0); + outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1); + } + break; + case HST_CNTL2_BLOCK: + outb_p(cmd, SMB_HST_CMD); + error = ali1563_block(a, data, rw); + goto Done; + } + + error = ali1563_transaction(a, size); + if (error) + goto Done; + + if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK)) + goto Done; + + switch (size) { + case HST_CNTL2_BYTE: /* Result put in SMBHSTDAT0 */ + data->byte = inb_p(SMB_HST_DAT0); + break; + case HST_CNTL2_BYTE_DATA: + data->byte = inb_p(SMB_HST_DAT0); + break; + case HST_CNTL2_WORD_DATA: + data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8); + break; + } +Done: + return error; +} + +static u32 ali1563_func(struct i2c_adapter *a) +{ + return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | + I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | + I2C_FUNC_SMBUS_BLOCK_DATA; +} + + +static int ali1563_setup(struct pci_dev *dev) +{ + u16 ctrl; + + pci_read_config_word(dev, ALI1563_SMBBA, &ctrl); + + /* SMB I/O Base in high 12 bits and must be aligned with the + * size of the I/O space. */ + ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1); + if (!ali1563_smba) { + dev_warn(&dev->dev, "ali1563_smba Uninitialized\n"); + goto Err; + } + + /* Check if device is enabled */ + if (!(ctrl & ALI1563_SMB_HOSTEN)) { + dev_warn(&dev->dev, "Host Controller not enabled\n"); + goto Err; + } + if (!(ctrl & ALI1563_SMB_IOEN)) { + dev_warn(&dev->dev, "I/O space not enabled, trying manually\n"); + pci_write_config_word(dev, ALI1563_SMBBA, + ctrl | ALI1563_SMB_IOEN); + pci_read_config_word(dev, ALI1563_SMBBA, &ctrl); + if (!(ctrl & ALI1563_SMB_IOEN)) { + dev_err(&dev->dev, + "I/O space still not enabled, giving up\n"); + goto Err; + } + } + + if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE, + ali1563_pci_driver.name)) + goto Err; + + if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE, + ali1563_pci_driver.name)) { + dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n", + ali1563_smba); + goto Err; + } + dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba); + + return 0; +Err: + return -ENODEV; +} + +static void ali1563_shutdown(struct pci_dev *dev) +{ + release_region(ali1563_smba, ALI1563_SMB_IOSIZE); +} + +static const struct i2c_algorithm ali1563_algorithm = { + .smbus_xfer = ali1563_access, + .functionality = ali1563_func, +}; + +static struct i2c_adapter ali1563_adapter = { + .owner = THIS_MODULE, + .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, + .algo = &ali1563_algorithm, +}; + +static int ali1563_probe(struct pci_dev *dev, + const struct pci_device_id *id_table) +{ + int error; + + error = ali1563_setup(dev); + if (error) + goto exit; + ali1563_adapter.dev.parent = &dev->dev; + snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name), + "SMBus ALi 1563 Adapter @ %04x", ali1563_smba); + error = i2c_add_adapter(&ali1563_adapter); + if (error) + goto exit_shutdown; + return 0; + +exit_shutdown: + ali1563_shutdown(dev); +exit: + dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error); + return error; +} + +static void ali1563_remove(struct pci_dev *dev) +{ + i2c_del_adapter(&ali1563_adapter); + ali1563_shutdown(dev); +} + +static const struct pci_device_id ali1563_id_table[] = { + { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) }, + {}, +}; + +MODULE_DEVICE_TABLE(pci, ali1563_id_table); + +static struct pci_driver ali1563_pci_driver = { + .name = "ali1563_smbus", + .id_table = ali1563_id_table, + .probe = ali1563_probe, + .remove = ali1563_remove, +}; + +module_pci_driver(ali1563_pci_driver); + +MODULE_LICENSE("GPL"); |