i2c: PA Semi SMBus driver
New driver for the PA Semi SMBus interfaces. Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Olof Johansson
Jean Delvare
Родитель
88b9e750e9
Коммит
beb58aa39e
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@ -2523,6 +2523,12 @@ M: olof@lixom.net
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L: netdev@vger.kernel.org
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S: Maintained
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PA SEMI SMBUS DRIVER
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P: Olof Johansson
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M: olof@lixom.net
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L: i2c@lm-sensors.org
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S: Maintained
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PARALLEL PORT SUPPORT
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P: Phil Blundell
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M: philb@gnu.org
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@ -342,6 +342,13 @@ config I2C_PARPORT_LIGHT
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This support is also available as a module. If so, the module
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will be called i2c-parport-light.
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config I2C_PASEMI
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tristate "PA Semi SMBus interface"
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# depends on PPC_PASEMI && I2C && PCI
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depends on I2C && PCI
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help
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Supports the PA Semi PWRficient on-chip SMBus interfaces.
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config I2C_PROSAVAGE
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tristate "S3/VIA (Pro)Savage"
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depends on I2C && PCI
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@ -27,6 +27,7 @@ obj-$(CONFIG_I2C_OCORES) += i2c-ocores.o
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obj-$(CONFIG_I2C_OMAP) += i2c-omap.o
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obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
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obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o
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obj-$(CONFIG_I2C_PASEMI) += i2c-pasemi.o
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obj-$(CONFIG_I2C_PCA_ISA) += i2c-pca-isa.o
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obj-$(CONFIG_I2C_PIIX4) += i2c-piix4.o
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obj-$(CONFIG_I2C_PNX) += i2c-pnx.o
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@ -0,0 +1,426 @@
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/*
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* Copyright (C) 2006-2007 PA Semi, Inc
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*
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* SMBus host driver for PA Semi PWRficient
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#include <linux/sched.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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static struct pci_driver pasemi_smb_driver;
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struct pasemi_smbus {
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struct pci_dev *dev;
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struct i2c_adapter adapter;
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unsigned long base;
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int size;
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};
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/* Register offsets */
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#define REG_MTXFIFO 0x00
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#define REG_MRXFIFO 0x04
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#define REG_SMSTA 0x14
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#define REG_CTL 0x1c
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/* Register defs */
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#define MTXFIFO_READ 0x00000400
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#define MTXFIFO_STOP 0x00000200
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#define MTXFIFO_START 0x00000100
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#define MTXFIFO_DATA_M 0x000000ff
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#define MRXFIFO_EMPTY 0x00000100
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#define MRXFIFO_DATA_M 0x000000ff
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#define SMSTA_XEN 0x08000000
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#define CTL_MRR 0x00000400
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#define CTL_MTR 0x00000200
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#define CTL_CLK_M 0x000000ff
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#define CLK_100K_DIV 84
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#define CLK_400K_DIV 21
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static inline void reg_write(struct pasemi_smbus *smbus, int reg, int val)
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{
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dev_dbg(&smbus->dev->dev, "smbus write reg %lx val %08x\n",
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smbus->base + reg, val);
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outl(val, smbus->base + reg);
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}
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static inline int reg_read(struct pasemi_smbus *smbus, int reg)
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{
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int ret;
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ret = inl(smbus->base + reg);
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dev_dbg(&smbus->dev->dev, "smbus read reg %lx val %08x\n",
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smbus->base + reg, ret);
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return ret;
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}
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#define TXFIFO_WR(smbus, reg) reg_write((smbus), REG_MTXFIFO, (reg))
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#define RXFIFO_RD(smbus) reg_read((smbus), REG_MRXFIFO)
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static void pasemi_smb_clear(struct pasemi_smbus *smbus)
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{
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unsigned int status;
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status = reg_read(smbus, REG_SMSTA);
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reg_write(smbus, REG_SMSTA, status);
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}
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static unsigned int pasemi_smb_waitready(struct pasemi_smbus *smbus)
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{
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int timeout = 10;
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unsigned int status;
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status = reg_read(smbus, REG_SMSTA);
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while (!(status & SMSTA_XEN) && timeout--) {
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msleep(1);
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status = reg_read(smbus, REG_SMSTA);
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}
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if (timeout < 0) {
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dev_warn(&smbus->dev->dev, "Timeout, status 0x%08x\n", status);
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reg_write(smbus, REG_SMSTA, status);
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return -ETIME;
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}
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/* Clear XEN */
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reg_write(smbus, REG_SMSTA, SMSTA_XEN);
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return 0;
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}
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static int pasemi_i2c_xfer_msg(struct i2c_adapter *adapter,
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struct i2c_msg *msg, int stop)
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{
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struct pasemi_smbus *smbus = adapter->algo_data;
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int read, i, err;
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u32 rd;
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read = msg->flags & I2C_M_RD ? 1 : 0;
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TXFIFO_WR(smbus, MTXFIFO_START | (msg->addr << 1) | read);
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if (read) {
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TXFIFO_WR(smbus, msg->len | MTXFIFO_READ |
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(stop ? MTXFIFO_STOP : 0));
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err = pasemi_smb_waitready(smbus);
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if (err)
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goto reset_out;
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for (i = 0; i < msg->len; i++) {
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rd = RXFIFO_RD(smbus);
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if (rd & MRXFIFO_EMPTY) {
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err = -ENODATA;
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goto reset_out;
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}
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msg->buf[i] = rd & MRXFIFO_DATA_M;
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}
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} else {
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for (i = 0; i < msg->len - 1; i++)
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TXFIFO_WR(smbus, msg->buf[i]);
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TXFIFO_WR(smbus, msg->buf[msg->len] |
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(stop ? MTXFIFO_STOP : 0));
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}
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return 0;
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reset_out:
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reg_write(smbus, REG_CTL, (CTL_MTR | CTL_MRR |
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(CLK_100K_DIV & CTL_CLK_M)));
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return err;
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}
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static int pasemi_i2c_xfer(struct i2c_adapter *adapter,
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struct i2c_msg *msgs, int num)
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{
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struct pasemi_smbus *smbus = adapter->algo_data;
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int ret, i;
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pasemi_smb_clear(smbus);
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ret = 0;
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for (i = 0; i < num && !ret; i++)
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ret = pasemi_i2c_xfer_msg(adapter, &msgs[i], (i == (num - 1)));
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return ret ? ret : num;
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}
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static int pasemi_smb_xfer(struct i2c_adapter *adapter,
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u16 addr, unsigned short flags, char read_write, u8 command,
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int size, union i2c_smbus_data *data)
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{
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struct pasemi_smbus *smbus = adapter->algo_data;
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unsigned int rd;
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int read_flag, err;
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int len = 0, i;
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/* All our ops take 8-bit shifted addresses */
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addr <<= 1;
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read_flag = read_write == I2C_SMBUS_READ;
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pasemi_smb_clear(smbus);
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switch (size) {
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case I2C_SMBUS_QUICK:
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TXFIFO_WR(smbus, addr | read_flag | MTXFIFO_START |
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MTXFIFO_STOP);
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break;
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case I2C_SMBUS_BYTE:
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TXFIFO_WR(smbus, addr | read_flag | MTXFIFO_START);
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if (read_write)
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TXFIFO_WR(smbus, 1 | MTXFIFO_STOP | MTXFIFO_READ);
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else
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TXFIFO_WR(smbus, MTXFIFO_STOP | command);
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break;
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case I2C_SMBUS_BYTE_DATA:
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TXFIFO_WR(smbus, addr | MTXFIFO_START);
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TXFIFO_WR(smbus, command);
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if (read_write) {
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TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);
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TXFIFO_WR(smbus, 1 | MTXFIFO_READ | MTXFIFO_STOP);
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} else {
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TXFIFO_WR(smbus, MTXFIFO_STOP | data->byte);
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}
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break;
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case I2C_SMBUS_WORD_DATA:
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TXFIFO_WR(smbus, addr | MTXFIFO_START);
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TXFIFO_WR(smbus, command);
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if (read_write) {
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TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);
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TXFIFO_WR(smbus, 2 | MTXFIFO_READ | MTXFIFO_STOP);
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} else {
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TXFIFO_WR(smbus, data->word & MTXFIFO_DATA_M);
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TXFIFO_WR(smbus, MTXFIFO_STOP | (data->word >> 8));
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}
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break;
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case I2C_SMBUS_BLOCK_DATA:
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TXFIFO_WR(smbus, addr | MTXFIFO_START);
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TXFIFO_WR(smbus, command);
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if (read_write) {
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TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);
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TXFIFO_WR(smbus, 1 | MTXFIFO_READ);
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rd = RXFIFO_RD(smbus);
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len = min_t(u8, (rd & MRXFIFO_DATA_M),
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I2C_SMBUS_BLOCK_MAX);
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TXFIFO_WR(smbus, (len + 1) | MTXFIFO_READ |
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MTXFIFO_STOP);
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} else {
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len = min_t(u8, data->block[0], I2C_SMBUS_BLOCK_MAX);
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TXFIFO_WR(smbus, len);
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for (i = 1; i < len; i++)
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TXFIFO_WR(smbus, data->block[i]);
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TXFIFO_WR(smbus, data->block[len] | MTXFIFO_STOP);
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}
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break;
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case I2C_SMBUS_PROC_CALL:
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read_write = I2C_SMBUS_READ;
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TXFIFO_WR(smbus, addr | MTXFIFO_START);
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TXFIFO_WR(smbus, command);
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TXFIFO_WR(smbus, data->word & MTXFIFO_DATA_M);
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TXFIFO_WR(smbus, (data->word >> 8) & MTXFIFO_DATA_M);
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TXFIFO_WR(smbus, addr | I2C_SMBUS_READ | MTXFIFO_START);
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TXFIFO_WR(smbus, 2 | MTXFIFO_STOP | MTXFIFO_READ);
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break;
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case I2C_SMBUS_BLOCK_PROC_CALL:
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len = min_t(u8, data->block[0], I2C_SMBUS_BLOCK_MAX - 1);
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read_write = I2C_SMBUS_READ;
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TXFIFO_WR(smbus, addr | MTXFIFO_START);
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TXFIFO_WR(smbus, command);
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TXFIFO_WR(smbus, len);
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for (i = 1; i <= len; i++)
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TXFIFO_WR(smbus, data->block[i]);
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TXFIFO_WR(smbus, addr | I2C_SMBUS_READ);
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TXFIFO_WR(smbus, MTXFIFO_READ | 1);
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rd = RXFIFO_RD(smbus);
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len = min_t(u8, (rd & MRXFIFO_DATA_M),
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I2C_SMBUS_BLOCK_MAX - len);
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TXFIFO_WR(smbus, (len + 1) | MTXFIFO_READ | MTXFIFO_STOP);
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break;
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default:
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dev_warn(&adapter->dev, "Unsupported transaction %d\n", size);
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return -EINVAL;
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}
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err = pasemi_smb_waitready(smbus);
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if (err)
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goto reset_out;
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if (read_write == I2C_SMBUS_WRITE)
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return 0;
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switch (size) {
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case I2C_SMBUS_BYTE:
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case I2C_SMBUS_BYTE_DATA:
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rd = RXFIFO_RD(smbus);
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if (rd & MRXFIFO_EMPTY) {
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err = -ENODATA;
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goto reset_out;
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}
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data->byte = rd & MRXFIFO_DATA_M;
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break;
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case I2C_SMBUS_WORD_DATA:
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case I2C_SMBUS_PROC_CALL:
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rd = RXFIFO_RD(smbus);
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if (rd & MRXFIFO_EMPTY) {
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err = -ENODATA;
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goto reset_out;
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}
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data->word = rd & MRXFIFO_DATA_M;
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rd = RXFIFO_RD(smbus);
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if (rd & MRXFIFO_EMPTY) {
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err = -ENODATA;
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goto reset_out;
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}
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data->word |= (rd & MRXFIFO_DATA_M) << 8;
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break;
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case I2C_SMBUS_BLOCK_DATA:
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case I2C_SMBUS_BLOCK_PROC_CALL:
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data->block[0] = len;
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for (i = 1; i <= len; i ++) {
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rd = RXFIFO_RD(smbus);
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if (rd & MRXFIFO_EMPTY) {
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err = -ENODATA;
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goto reset_out;
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}
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data->block[i] = rd & MRXFIFO_DATA_M;
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}
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break;
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}
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return 0;
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reset_out:
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reg_write(smbus, REG_CTL, (CTL_MTR | CTL_MRR |
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(CLK_100K_DIV & CTL_CLK_M)));
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return err;
|
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}
|
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static u32 pasemi_smb_func(struct i2c_adapter *adapter)
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{
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return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
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I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_PROC_CALL |
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I2C_FUNC_SMBUS_BLOCK_PROC_CALL | I2C_FUNC_I2C;
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}
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static const struct i2c_algorithm smbus_algorithm = {
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.master_xfer = pasemi_i2c_xfer,
|
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.smbus_xfer = pasemi_smb_xfer,
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.functionality = pasemi_smb_func,
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};
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|
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static int __devinit pasemi_smb_probe(struct pci_dev *dev,
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const struct pci_device_id *id)
|
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{
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struct pasemi_smbus *smbus;
|
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int error;
|
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|
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if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
|
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return -ENODEV;
|
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|
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smbus = kzalloc(sizeof(struct pasemi_smbus), GFP_KERNEL);
|
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if (!smbus)
|
||||
return -ENOMEM;
|
||||
|
||||
smbus->dev = dev;
|
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smbus->base = pci_resource_start(dev, 0);
|
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smbus->size = pci_resource_len(dev, 0);
|
||||
|
||||
if (!request_region(smbus->base, smbus->size,
|
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pasemi_smb_driver.name)) {
|
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error = -EBUSY;
|
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goto out_kfree;
|
||||
}
|
||||
|
||||
smbus->adapter.owner = THIS_MODULE;
|
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snprintf(smbus->adapter.name, I2C_NAME_SIZE,
|
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"PA Semi SMBus adapter at 0x%lx", smbus->base);
|
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smbus->adapter.class = I2C_CLASS_HWMON;
|
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smbus->adapter.algo = &smbus_algorithm;
|
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smbus->adapter.algo_data = smbus;
|
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|
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/* set up the driverfs linkage to our parent device */
|
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smbus->adapter.dev.parent = &dev->dev;
|
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|
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reg_write(smbus, REG_CTL, (CTL_MTR | CTL_MRR |
|
||||
(CLK_100K_DIV & CTL_CLK_M)));
|
||||
|
||||
error = i2c_add_adapter(&smbus->adapter);
|
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if (error)
|
||||
goto out_release_region;
|
||||
|
||||
pci_set_drvdata(dev, smbus);
|
||||
|
||||
return 0;
|
||||
|
||||
out_release_region:
|
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release_region(smbus->base, smbus->size);
|
||||
out_kfree:
|
||||
kfree(smbus);
|
||||
return error;
|
||||
}
|
||||
|
||||
static void __devexit pasemi_smb_remove(struct pci_dev *dev)
|
||||
{
|
||||
struct pasemi_smbus *smbus = pci_get_drvdata(dev);
|
||||
|
||||
i2c_del_adapter(&smbus->adapter);
|
||||
release_region(smbus->base, smbus->size);
|
||||
kfree(smbus);
|
||||
}
|
||||
|
||||
static struct pci_device_id pasemi_smb_ids[] = {
|
||||
{ PCI_DEVICE(0x1959, 0xa003) },
|
||||
{ 0, }
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(pci, pasemi_smb_ids);
|
||||
|
||||
static struct pci_driver pasemi_smb_driver = {
|
||||
.name = "i2c-pasemi",
|
||||
.id_table = pasemi_smb_ids,
|
||||
.probe = pasemi_smb_probe,
|
||||
.remove = __devexit_p(pasemi_smb_remove),
|
||||
};
|
||||
|
||||
static int __init pasemi_smb_init(void)
|
||||
{
|
||||
return pci_register_driver(&pasemi_smb_driver);
|
||||
}
|
||||
|
||||
static void __exit pasemi_smb_exit(void)
|
||||
{
|
||||
pci_unregister_driver(&pasemi_smb_driver);
|
||||
}
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
|
||||
MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");
|
||||
|
||||
module_init(pasemi_smb_init);
|
||||
module_exit(pasemi_smb_exit);
|
||||
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