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Diffstat (limited to 'drivers/i2c/busses/i2c-amd756.c')
-rw-r--r--drivers/i2c/busses/i2c-amd756.c402
1 files changed, 402 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-amd756.c b/drivers/i2c/busses/i2c-amd756.c
new file mode 100644
index 000000000..ef1307a25
--- /dev/null
+++ b/drivers/i2c/busses/i2c-amd756.c
@@ -0,0 +1,402 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org>
+
+ Shamelessly ripped from i2c-piix4.c:
+
+ Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
+ Philip Edelbrock <phil@netroedge.com>
+
+*/
+
+/*
+ 2002-04-08: Added nForce support. (Csaba Halasz)
+ 2002-10-03: Fixed nForce PnP I/O port. (Michael Steil)
+ 2002-12-28: Rewritten into something that resembles a Linux driver (hch)
+ 2003-11-29: Added back AMD8111 removed by the previous rewrite.
+ (Philip Pokorny)
+*/
+
+/*
+ Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce
+ Note: we assume there can only be one device, with one SMBus interface.
+*/
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/stddef.h>
+#include <linux/ioport.h>
+#include <linux/i2c.h>
+#include <linux/acpi.h>
+#include <linux/io.h>
+
+/* AMD756 SMBus address offsets */
+#define SMB_ADDR_OFFSET 0xE0
+#define SMB_IOSIZE 16
+#define SMB_GLOBAL_STATUS (0x0 + amd756_ioport)
+#define SMB_GLOBAL_ENABLE (0x2 + amd756_ioport)
+#define SMB_HOST_ADDRESS (0x4 + amd756_ioport)
+#define SMB_HOST_DATA (0x6 + amd756_ioport)
+#define SMB_HOST_COMMAND (0x8 + amd756_ioport)
+#define SMB_HOST_BLOCK_DATA (0x9 + amd756_ioport)
+#define SMB_HAS_DATA (0xA + amd756_ioport)
+#define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_ioport)
+#define SMB_HAS_HOST_ADDRESS (0xE + amd756_ioport)
+#define SMB_SNOOP_ADDRESS (0xF + amd756_ioport)
+
+/* PCI Address Constants */
+
+/* address of I/O space */
+#define SMBBA 0x058 /* mh */
+#define SMBBANFORCE 0x014
+
+/* general configuration */
+#define SMBGCFG 0x041 /* mh */
+
+/* silicon revision code */
+#define SMBREV 0x008
+
+/* Other settings */
+#define MAX_TIMEOUT 500
+
+/* AMD756 constants */
+#define AMD756_QUICK 0x00
+#define AMD756_BYTE 0x01
+#define AMD756_BYTE_DATA 0x02
+#define AMD756_WORD_DATA 0x03
+#define AMD756_PROCESS_CALL 0x04
+#define AMD756_BLOCK_DATA 0x05
+
+static struct pci_driver amd756_driver;
+static unsigned short amd756_ioport;
+
+/*
+ SMBUS event = I/O 28-29 bit 11
+ see E0 for the status bits and enabled in E2
+
+*/
+#define GS_ABRT_STS (1 << 0)
+#define GS_COL_STS (1 << 1)
+#define GS_PRERR_STS (1 << 2)
+#define GS_HST_STS (1 << 3)
+#define GS_HCYC_STS (1 << 4)
+#define GS_TO_STS (1 << 5)
+#define GS_SMB_STS (1 << 11)
+
+#define GS_CLEAR_STS (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \
+ GS_HCYC_STS | GS_TO_STS )
+
+#define GE_CYC_TYPE_MASK (7)
+#define GE_HOST_STC (1 << 3)
+#define GE_ABORT (1 << 5)
+
+
+static int amd756_transaction(struct i2c_adapter *adap)
+{
+ int temp;
+ int result = 0;
+ int timeout = 0;
+
+ dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "
+ "DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS),
+ inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS),
+ inb_p(SMB_HOST_DATA));
+
+ /* Make sure the SMBus host is ready to start transmitting */
+ if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {
+ dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp);
+ do {
+ msleep(1);
+ temp = inw_p(SMB_GLOBAL_STATUS);
+ } while ((temp & (GS_HST_STS | GS_SMB_STS)) &&
+ (timeout++ < MAX_TIMEOUT));
+ /* If the SMBus is still busy, we give up */
+ if (timeout > MAX_TIMEOUT) {
+ dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp);
+ goto abort;
+ }
+ timeout = 0;
+ }
+
+ /* start the transaction by setting the start bit */
+ outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE);
+
+ /* We will always wait for a fraction of a second! */
+ do {
+ msleep(1);
+ temp = inw_p(SMB_GLOBAL_STATUS);
+ } while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT));
+
+ /* If the SMBus is still busy, we give up */
+ if (timeout > MAX_TIMEOUT) {
+ dev_dbg(&adap->dev, "Completion timeout!\n");
+ goto abort;
+ }
+
+ if (temp & GS_PRERR_STS) {
+ result = -ENXIO;
+ dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n");
+ }
+
+ if (temp & GS_COL_STS) {
+ result = -EIO;
+ dev_warn(&adap->dev, "SMBus collision!\n");
+ }
+
+ if (temp & GS_TO_STS) {
+ result = -ETIMEDOUT;
+ dev_dbg(&adap->dev, "SMBus protocol timeout!\n");
+ }
+
+ if (temp & GS_HCYC_STS)
+ dev_dbg(&adap->dev, "SMBus protocol success!\n");
+
+ outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
+
+#ifdef DEBUG
+ if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) {
+ dev_dbg(&adap->dev,
+ "Failed reset at end of transaction (%04x)\n", temp);
+ }
+#endif
+
+ dev_dbg(&adap->dev,
+ "Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n",
+ inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE),
+ inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA));
+
+ return result;
+
+ abort:
+ dev_warn(&adap->dev, "Sending abort\n");
+ outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
+ msleep(100);
+ outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
+ return -EIO;
+}
+
+/* Return negative errno on error. */
+static s32 amd756_access(struct i2c_adapter * adap, u16 addr,
+ unsigned short flags, char read_write,
+ u8 command, int size, union i2c_smbus_data * data)
+{
+ int i, len;
+ int status;
+
+ switch (size) {
+ case I2C_SMBUS_QUICK:
+ outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMB_HOST_ADDRESS);
+ size = AMD756_QUICK;
+ break;
+ case I2C_SMBUS_BYTE:
+ outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMB_HOST_ADDRESS);
+ if (read_write == I2C_SMBUS_WRITE)
+ outb_p(command, SMB_HOST_DATA);
+ size = AMD756_BYTE;
+ break;
+ case I2C_SMBUS_BYTE_DATA:
+ outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMB_HOST_ADDRESS);
+ outb_p(command, SMB_HOST_COMMAND);
+ if (read_write == I2C_SMBUS_WRITE)
+ outw_p(data->byte, SMB_HOST_DATA);
+ size = AMD756_BYTE_DATA;
+ break;
+ case I2C_SMBUS_WORD_DATA:
+ outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMB_HOST_ADDRESS);
+ outb_p(command, SMB_HOST_COMMAND);
+ if (read_write == I2C_SMBUS_WRITE)
+ outw_p(data->word, SMB_HOST_DATA); /* TODO: endian???? */
+ size = AMD756_WORD_DATA;
+ break;
+ case I2C_SMBUS_BLOCK_DATA:
+ outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMB_HOST_ADDRESS);
+ outb_p(command, SMB_HOST_COMMAND);
+ if (read_write == I2C_SMBUS_WRITE) {
+ len = data->block[0];
+ if (len < 0)
+ len = 0;
+ if (len > 32)
+ len = 32;
+ outw_p(len, SMB_HOST_DATA);
+ /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
+ for (i = 1; i <= len; i++)
+ outb_p(data->block[i],
+ SMB_HOST_BLOCK_DATA);
+ }
+ size = AMD756_BLOCK_DATA;
+ break;
+ default:
+ dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
+ return -EOPNOTSUPP;
+ }
+
+ /* How about enabling interrupts... */
+ outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE);
+
+ status = amd756_transaction(adap);
+ if (status)
+ return status;
+
+ if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK))
+ return 0;
+
+
+ switch (size) {
+ case AMD756_BYTE:
+ data->byte = inw_p(SMB_HOST_DATA);
+ break;
+ case AMD756_BYTE_DATA:
+ data->byte = inw_p(SMB_HOST_DATA);
+ break;
+ case AMD756_WORD_DATA:
+ data->word = inw_p(SMB_HOST_DATA); /* TODO: endian???? */
+ break;
+ case AMD756_BLOCK_DATA:
+ data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f;
+ if(data->block[0] > 32)
+ data->block[0] = 32;
+ /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
+ for (i = 1; i <= data->block[0]; i++)
+ data->block[i] = inb_p(SMB_HOST_BLOCK_DATA);
+ break;
+ }
+
+ return 0;
+}
+
+static u32 amd756_func(struct i2c_adapter *adapter)
+{
+ 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 const struct i2c_algorithm smbus_algorithm = {
+ .smbus_xfer = amd756_access,
+ .functionality = amd756_func,
+};
+
+struct i2c_adapter amd756_smbus = {
+ .owner = THIS_MODULE,
+ .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
+ .algo = &smbus_algorithm,
+};
+
+enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 };
+static const char* chipname[] = {
+ "AMD756", "AMD766", "AMD768",
+ "nVidia nForce", "AMD8111",
+};
+
+static const struct pci_device_id amd756_ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B),
+ .driver_data = AMD756 },
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413),
+ .driver_data = AMD766 },
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443),
+ .driver_data = AMD768 },
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS),
+ .driver_data = AMD8111 },
+ { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS),
+ .driver_data = NFORCE },
+ { 0, }
+};
+
+MODULE_DEVICE_TABLE (pci, amd756_ids);
+
+static int amd756_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ int nforce = (id->driver_data == NFORCE);
+ int error;
+ u8 temp;
+
+ if (amd756_ioport) {
+ dev_err(&pdev->dev, "Only one device supported "
+ "(you have a strange motherboard, btw)\n");
+ return -ENODEV;
+ }
+
+ if (nforce) {
+ if (PCI_FUNC(pdev->devfn) != 1)
+ return -ENODEV;
+
+ pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport);
+ amd756_ioport &= 0xfffc;
+ } else { /* amd */
+ if (PCI_FUNC(pdev->devfn) != 3)
+ return -ENODEV;
+
+ pci_read_config_byte(pdev, SMBGCFG, &temp);
+ if ((temp & 128) == 0) {
+ dev_err(&pdev->dev,
+ "Error: SMBus controller I/O not enabled!\n");
+ return -ENODEV;
+ }
+
+ /* Determine the address of the SMBus areas */
+ /* Technically it is a dword but... */
+ pci_read_config_word(pdev, SMBBA, &amd756_ioport);
+ amd756_ioport &= 0xff00;
+ amd756_ioport += SMB_ADDR_OFFSET;
+ }
+
+ error = acpi_check_region(amd756_ioport, SMB_IOSIZE,
+ amd756_driver.name);
+ if (error)
+ return -ENODEV;
+
+ if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) {
+ dev_err(&pdev->dev, "SMB region 0x%x already in use!\n",
+ amd756_ioport);
+ return -ENODEV;
+ }
+
+ pci_read_config_byte(pdev, SMBREV, &temp);
+ dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp);
+ dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport);
+
+ /* set up the sysfs linkage to our parent device */
+ amd756_smbus.dev.parent = &pdev->dev;
+
+ snprintf(amd756_smbus.name, sizeof(amd756_smbus.name),
+ "SMBus %s adapter at %04x", chipname[id->driver_data],
+ amd756_ioport);
+
+ error = i2c_add_adapter(&amd756_smbus);
+ if (error)
+ goto out_err;
+
+ return 0;
+
+ out_err:
+ release_region(amd756_ioport, SMB_IOSIZE);
+ return error;
+}
+
+static void amd756_remove(struct pci_dev *dev)
+{
+ i2c_del_adapter(&amd756_smbus);
+ release_region(amd756_ioport, SMB_IOSIZE);
+}
+
+static struct pci_driver amd756_driver = {
+ .name = "amd756_smbus",
+ .id_table = amd756_ids,
+ .probe = amd756_probe,
+ .remove = amd756_remove,
+};
+
+module_pci_driver(amd756_driver);
+
+MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
+MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(amd756_smbus);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 09:04:30 +0000