RE: [PATCH] EG20T: Update PCH_I2C driver to 2.6.36

From: Wang, Qi
Date: Tue Nov 09 2010 - 00:22:25 EST

Hi Jean,

I verified this driver at our development board, and it passed our test programming. There's no functionality issue now. Also we together polish this code again.

Would you please accept this driver?

Best Regards,
Qi.

> -----Original Message-----
> From: Tomoya MORINAGA [mailto:tomoya-linux@xxxxxxxxxxxxxxx]
> Sent: Tuesday, November 09, 2010 12:25 PM
> To: Jean Delvare (PC drivers, core); Ben Dooks (embedded platforms); Samuel
> Ortiz; Linus Walleij; Wolfram Sang; Ralf Baechle; srinidhi kasagar;
> linux-i2c@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Cc: Wang, Qi; Khor, Andrew Chih Howe; Wang, Yong Y; Ewe, Kok Howg
> Subject: [PATCH] EG20T: Update PCH_I2C driver to 2.6.36
>
> Hi Jean,
>
> I have got Intel's signature.
> Please push it to kernel tree.
>
> Thanks,
> Tomoya MORINAGA(OKI SEMICONDUCTOR CO., LTD.)
> ---
> I2C driver of EG20T PCH
>
> EG20T PCH is the platform controller hub that is going to be used in
> Intel's upcoming general embedded platform. All IO peripherals in
> EG20T PCH are actually devices sitting on AMBA bus.
> EG20T PCH has I2C I/F. Using this I/F, it is able to access system
> devices connected to I2C.
>
> Signed-off-by: Tomoya MORINAGA <tomoya-linux@xxxxxxxxxxxxxxx>
> Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxxxxxx>
> Signed-off-by: Qi Wang <qi.wang@xxxxxxxxx>
> ---
> drivers/i2c/busses/Kconfig | 8 +
> drivers/i2c/busses/Makefile | 1 +
> drivers/i2c/busses/i2c-eg20t.c | 900
> ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 909 insertions(+), 0 deletions(-)
> create mode 100644 drivers/i2c/busses/i2c-eg20t.c
>
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 6539ac2..fcce69c 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -627,6 +627,14 @@ config I2C_XILINX
> This driver can also be built as a module. If so, the module
> will be called xilinx_i2c.
>
> +config I2C_EG20T
> + tristate "PCH I2C of Intel EG20T"
> + depends on PCI
> + help
> + This driver is for PCH(Platform controller Hub) I2C of EG20T which
> + is an IOH(Input/Output Hub) for x86 embedded processor.
> + This driver can access PCH I2C bus device.
> +
> comment "External I2C/SMBus adapter drivers"
>
> config I2C_PARPORT
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index c3ef492..e55e051 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -60,6 +60,7 @@ obj-$(CONFIG_I2C_STU300) += i2c-stu300.o
> obj-$(CONFIG_I2C_VERSATILE) += i2c-versatile.o
> obj-$(CONFIG_I2C_OCTEON) += i2c-octeon.o
> obj-$(CONFIG_I2C_XILINX) += i2c-xiic.o
> +obj-$(CONFIG_I2C_EG20T) += i2c-eg20t.o
>
> # External I2C/SMBus adapter drivers
> obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
> diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
> new file mode 100644
> index 0000000..f835635
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-eg20t.c
> @@ -0,0 +1,900 @@
> +/*
> + * Copyright (C) 2010 OKI SEMICONDUCTOR CO., LTD.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
> USA.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/errno.h>
> +#include <linux/i2c.h>
> +#include <linux/fs.h>
> +#include <linux/io.h>
> +#include <linux/types.h>
> +#include <linux/interrupt.h>
> +#include <linux/jiffies.h>
> +#include <linux/pci.h>
> +#include <linux/mutex.h>
> +#include <linux/ktime.h>
> +
> +#define PCH_EVENT_SET 0 /* I2C Interrupt Event Set Status */
> +#define PCH_EVENT_NONE 1 /* I2C Interrupt Event Clear Status */
> +#define PCH_MAX_CLK 100000 /* Maximum Clock speed in MHz */
> +#define PCH_BUFFER_MODE_ENABLE 0x0002 /* flag for Buffer mode
> enable */
> +#define PCH_EEPROM_SW_RST_MODE_ENABLE 0x0008 /* EEPROM
> SW RST enable flag */
> +
> +#define PCH_I2CSADR 0x00 /* I2C slave address register */
> +#define PCH_I2CCTL 0x04 /* I2C control register */
> +#define PCH_I2CSR 0x08 /* I2C status register */
> +#define PCH_I2CDR 0x0C /* I2C data register */
> +#define PCH_I2CMON 0x10 /* I2C bus monitor register */
> +#define PCH_I2CBC 0x14 /* I2C bus transfer rate setup counter */
> +#define PCH_I2CMOD 0x18 /* I2C mode register */
> +#define PCH_I2CBUFSLV 0x1C /* I2C buffer mode slave address
> register */
> +#define PCH_I2CBUFSUB 0x20 /* I2C buffer mode subaddress register
> */
> +#define PCH_I2CBUFFOR 0x24 /* I2C buffer mode format register */
> +#define PCH_I2CBUFCTL 0x28 /* I2C buffer mode control register */
> +#define PCH_I2CBUFMSK 0x2C /* I2C buffer mode interrupt mask
> register */
> +#define PCH_I2CBUFSTA 0x30 /* I2C buffer mode status register */
> +#define PCH_I2CBUFLEV 0x34 /* I2C buffer mode level register */
> +#define PCH_I2CESRFOR 0x38 /* EEPROM software reset mode
> format register */
> +#define PCH_I2CESRCTL 0x3C /* EEPROM software reset mode ctrl
> register */
> +#define PCH_I2CESRMSK 0x40 /* EEPROM software reset mode */
> +#define PCH_I2CESRSTA 0x44 /* EEPROM software reset mode
> status register */
> +#define PCH_I2CTMR 0x48 /* I2C timer register */
> +#define PCH_I2CSRST 0xFC /* I2C reset register */
> +#define PCH_I2CNF 0xF8 /* I2C noise filter register */
> +
> +#define BUS_IDLE_TIMEOUT 20
> +#define PCH_I2CCTL_I2CMEN 0x0080
> +#define TEN_BIT_ADDR_DEFAULT 0xF000
> +#define TEN_BIT_ADDR_MASK 0xF0
> +#define PCH_START 0x0020
> +#define PCH_ESR_START 0x0001
> +#define PCH_BUFF_START 0x1
> +#define PCH_REPSTART 0x0004
> +#define PCH_ACK 0x0008
> +#define PCH_GETACK 0x0001
> +#define CLR_REG 0x0
> +#define I2C_RD 0x1
> +#define I2CMCF_BIT 0x0080
> +#define I2CMIF_BIT 0x0002
> +#define I2CMAL_BIT 0x0010
> +#define I2CBMFI_BIT 0x0001
> +#define I2CBMAL_BIT 0x0002
> +#define I2CBMNA_BIT 0x0004
> +#define I2CBMTO_BIT 0x0008
> +#define I2CBMIS_BIT 0x0010
> +#define I2CESRFI_BIT 0X0001
> +#define I2CESRTO_BIT 0x0002
> +#define I2CESRFIIE_BIT 0x1
> +#define I2CESRTOIE_BIT 0x2
> +#define I2CBMDZ_BIT 0x0040
> +#define I2CBMAG_BIT 0x0020
> +#define I2CMBB_BIT 0x0020
> +#define BUFFER_MODE_MASK (I2CBMFI_BIT | I2CBMAL_BIT |
> I2CBMNA_BIT | \
> + I2CBMTO_BIT | I2CBMIS_BIT)
> +#define I2C_ADDR_MSK 0xFF
> +#define I2C_MSB_2B_MSK 0x300
> +#define FAST_MODE_CLK 400
> +#define FAST_MODE_EN 0x0001
> +#define SUB_ADDR_LEN_MAX 4
> +#define BUF_LEN_MAX 32
> +#define PCH_BUFFER_MODE 0x1
> +#define EEPROM_SW_RST_MODE 0x0002
> +#define NORMAL_INTR_ENBL 0x0300
> +#define EEPROM_RST_INTR_ENBL (I2CESRFIIE_BIT | I2CESRTOIE_BIT)
> +#define EEPROM_RST_INTR_DISBL 0x0
> +#define BUFFER_MODE_INTR_ENBL 0x001F
> +#define BUFFER_MODE_INTR_DISBL 0x0
> +#define NORMAL_MODE 0x0
> +#define BUFFER_MODE 0x1
> +#define EEPROM_SR_MODE 0x2
> +#define I2C_TX_MODE 0x0010
> +#define PCH_BUF_TX 0xFFF7
> +#define PCH_BUF_RD 0x0008
> +#define I2C_ERROR_MASK (I2CESRTO_EVENT | I2CBMIS_EVENT |
> I2CBMTO_EVENT | \
> + I2CBMNA_EVENT | I2CBMAL_EVENT | I2CMAL_EVENT)
> +#define I2CMAL_EVENT 0x0001
> +#define I2CMCF_EVENT 0x0002
> +#define I2CBMFI_EVENT 0x0004
> +#define I2CBMAL_EVENT 0x0008
> +#define I2CBMNA_EVENT 0x0010
> +#define I2CBMTO_EVENT 0x0020
> +#define I2CBMIS_EVENT 0x0040
> +#define I2CESRFI_EVENT 0x0080
> +#define I2CESRTO_EVENT 0x0100
> +#define PCI_DEVICE_ID_PCH_I2C 0x8817
> +
> +#define pch_dbg(adap, fmt, arg...) \
> + dev_dbg(adap->pch_adapter.dev.parent, "%s :" fmt, __func__, ##arg)
> +
> +#define pch_err(adap, fmt, arg...) \
> + dev_err(adap->pch_adapter.dev.parent, "%s :" fmt, __func__, ##arg)
> +
> +#define pch_pci_err(pdev, fmt, arg...) \
> + dev_err(&pdev->dev, "%s :" fmt, __func__, ##arg)
> +
> +#define pch_pci_dbg(pdev, fmt, arg...) \
> + dev_dbg(&pdev->dev, "%s :" fmt, __func__, ##arg)
> +
> +/**
> + * struct i2c_algo_pch_data - for I2C driver functionalities
> + * @pch_adapter: stores the reference to i2c_adapter structure
> + * @p_adapter_info: stores the reference to adapter_info structure
> + * @pch_base_address: specifies the remapped base address
> + * @pch_buff_mode_en: specifies if buffer mode is enabled
> + * @pch_event_flag: specifies occurrence of interrupt events
> + * @pch_i2c_xfer_in_progress: specifies whether the transfer is completed
> + */
> +struct i2c_algo_pch_data {
> + struct i2c_adapter pch_adapter;
> + struct adapter_info *p_adapter_info;
> + void __iomem *pch_base_address;
> + int pch_buff_mode_en;
> + u32 pch_event_flag;
> + bool pch_i2c_xfer_in_progress;
> +};
> +
> +/**
> + * struct adapter_info - This structure holds the adapter information for the
> + PCH i2c controller
> + * @pch_data: stores a list of i2c_algo_pch_data
> + * @pch_i2c_suspended: specifies whether the system is suspended or not
> + * perhaps with more lines and words.
> + *
> + * pch_data has as many elements as maximum I2C channels
> + */
> +struct adapter_info {
> + struct i2c_algo_pch_data pch_data;
> + bool pch_i2c_suspended;
> +};
> +
> +
> +static int pch_i2c_speed = 100; /* I2C bus speed in Kbps */
> +static int pch_clk = 50000; /* specifies I2C clock speed in KHz */
> +static wait_queue_head_t pch_event;
> +static DEFINE_MUTEX(pch_mutex);
> +
> +static struct pci_device_id __devinitdata pch_pcidev_id[] = {
> + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PCH_I2C)},
> + {0,}
> +};
> +
> +static irqreturn_t pch_i2c_handler(int irq, void *pData);
> +
> +static inline void pch_setbit(void __iomem *addr, u32 offset, u32 bitmask)
> +{
> + u32 val;
> + val = ioread32(addr + offset);
> + val |= bitmask;
> + iowrite32(val, addr + offset);
> +}
> +
> +static inline void pch_clrbit(void __iomem *addr, u32 offset, u32 bitmask)
> +{
> + u32 val;
> + val = ioread32(addr + offset);
> + val &= (~bitmask);
> + iowrite32(val, addr + offset);
> +}
> +
> +/**
> + * pch_i2c_init() - hardware initialization of I2C module
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + */
> +static void pch_i2c_init(struct i2c_algo_pch_data *adap)
> +{
> + void __iomem *p = adap->pch_base_address;
> + u32 pch_i2cbc;
> + u32 pch_i2ctmr;
> + u32 reg_value;
> +
> + /* reset I2C controller */
> + iowrite32(0x01, p + PCH_I2CSRST);
> + msleep(20);
> + iowrite32(0x0, p + PCH_I2CSRST);
> +
> + /* Initialize I2C registers */
> + iowrite32(0x21, p + PCH_I2CNF);
> +
> + pch_setbit(adap->pch_base_address, PCH_I2CCTL,
> + PCH_I2CCTL_I2CMEN);
> +
> + if (pch_i2c_speed != 400)
> + pch_i2c_speed = 100;
> +
> + reg_value = PCH_I2CCTL_I2CMEN;
> + if (pch_i2c_speed == FAST_MODE_CLK) {
> + reg_value |= FAST_MODE_EN;
> + pch_dbg(adap, "Fast mode enabled\n");
> + }
> +
> + if (pch_clk > PCH_MAX_CLK)
> + pch_clk = 62500;
> +
> + pch_i2cbc = (pch_clk + (pch_i2c_speed * 4)) / pch_i2c_speed * 8;
> + /* Set transfer speed in I2CBC */
> + iowrite32(pch_i2cbc, p + PCH_I2CBC);
> +
> + pch_i2ctmr = (pch_clk) / 8;
> + iowrite32(pch_i2ctmr, p + PCH_I2CTMR);
> +
> + reg_value |= NORMAL_INTR_ENBL; /* Enable interrupts in normal
> mode */
> + iowrite32(reg_value, p + PCH_I2CCTL);
> +
> + pch_dbg(adap,
> + "I2CCTL=%x pch_i2cbc=%x pch_i2ctmr=%x Enable interrupts\n",
> + ioread32(p + PCH_I2CCTL), pch_i2cbc, pch_i2ctmr);
> +
> + init_waitqueue_head(&pch_event);
> +}
> +
> +static inline bool ktime_lt(const ktime_t cmp1, const ktime_t cmp2)
> +{
> + return cmp1.tv64 < cmp2.tv64;
> +}
> +
> +/**
> + * pch_i2c_wait_for_bus_idle() - check the status of bus.
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + * @timeout: waiting time counter (us).
> + */
> +static s32 pch_i2c_wait_for_bus_idle(struct i2c_algo_pch_data *adap,
> + s32 timeout)
> +{
> + void __iomem *p = adap->pch_base_address;
> +
> + /* MAX timeout value is timeout*1000*1000nsec */
> + ktime_t ns_val = ktime_add_ns(ktime_get(), timeout*1000*1000);
> + do {
> + if ((ioread32(p + PCH_I2CSR) & I2CMBB_BIT) == 0)
> + break;
> + msleep(20);
> + } while (ktime_lt(ktime_get(), ns_val));
> +
> + pch_dbg(adap, "I2CSR = %x\n", ioread32(p + PCH_I2CSR));
> +
> + if (timeout == 0) {
> + pch_err(adap, "%s: Timeout Error.return%d\n", __func__, -ETIME);
> + return -ETIME;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * pch_i2c_start() - Generate I2C start condition in normal mode.
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + *
> + * Generate I2C start condition in normal mode by setting I2CCTL.I2CMSTA to
> 1.
> + */
> +static void pch_i2c_start(struct i2c_algo_pch_data *adap)
> +{
> + void __iomem *p = adap->pch_base_address;
> + pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
> + pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_START);
> +}
> +
> +/**
> + * pch_i2c_wait_for_xfer_complete() - initiates a wait for the tx complete
> event
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + */
> +static s32 pch_i2c_wait_for_xfer_complete(struct i2c_algo_pch_data *adap)
> +{
> + s32 ret;
> + ret = wait_event_timeout(pch_event,
> + (adap->pch_event_flag != 0), msecs_to_jiffies(50));
> + if (ret < 0) {
> + pch_err(adap, "timeout: %x\n", adap->pch_event_flag);
> + return ret;
> + }
> +
> + if (ret == 0) {
> + pch_err(adap, "timeout: %x\n", adap->pch_event_flag);
> + return -ETIMEDOUT;
> + }
> +
> + if (adap->pch_event_flag & I2C_ERROR_MASK) {
> + pch_err(adap, "error bits set: %x\n", adap->pch_event_flag);
> + return -EIO;
> + }
> +
> + adap->pch_event_flag = 0;
> +
> + return 0;
> +}
> +
> +/**
> + * pch_i2c_getack() - to confirm ACK/NACK
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + */
> +static s32 pch_i2c_getack(struct i2c_algo_pch_data *adap)
> +{
> + u32 reg_val;
> + void __iomem *p = adap->pch_base_address;
> + reg_val = ioread32(p + PCH_I2CSR) & PCH_GETACK;
> +
> + if (reg_val != 0) {
> + pch_err(adap, "return%d\n", -EPROTO);
> + return -EPROTO;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * pch_i2c_stop() - generate stop condition in normal mode.
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + */
> +static void pch_i2c_stop(struct i2c_algo_pch_data *adap)
> +{
> + void __iomem *p = adap->pch_base_address;
> + pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
> + /* clear the start bit */
> + pch_clrbit(adap->pch_base_address, PCH_I2CCTL, PCH_START);
> +}
> +
> +/**
> + * pch_i2c_repstart() - generate repeated start condition in normal mode
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + */
> +static void pch_i2c_repstart(struct i2c_algo_pch_data *adap)
> +{
> + void __iomem *p = adap->pch_base_address;
> + pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
> + pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_REPSTART);
> +}
> +
> +/**
> + * pch_i2c_writebytes() - write data to I2C bus in normal mode
> + * @i2c_adap: Pointer to the struct i2c_adapter.
> + * @last: specifies whether last message or not.
> + * In the case of compound mode it will be 1 for last message,
> + * otherwise 0.
> + * @first: specifies whether first message or not.
> + * 1 for first message otherwise 0.
> + */
> +static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
> + struct i2c_msg *msgs, u32 last, u32 first)
> +{
> + struct i2c_algo_pch_data *adap = i2c_adap->algo_data;
> + u8 *buf;
> + u32 length;
> + u32 addr;
> + u32 addr_2_msb;
> + u32 addr_8_lsb;
> + s32 wrcount;
> + void __iomem *p = adap->pch_base_address;
> +
> + length = msgs->len;
> + buf = msgs->buf;
> + addr = msgs->addr;
> +
> + /* enable master tx */
> + pch_setbit(adap->pch_base_address, PCH_I2CCTL, I2C_TX_MODE);
> +
> + pch_dbg(adap, "I2CCTL = %x msgs->len = %d\n", ioread32(p +
> PCH_I2CCTL),
> + length);
> +
> + if (first) {
> + if (pch_i2c_wait_for_bus_idle(adap, BUS_IDLE_TIMEOUT) == -ETIME)
> + return -ETIME;
> + }
> +
> + if (msgs->flags & I2C_M_TEN) {
> + addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7);
> + iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR);
> + if (first)
> + pch_i2c_start(adap);
> + if (pch_i2c_wait_for_xfer_complete(adap) == 0 &&
> + pch_i2c_getack(adap) == 0) {
> + addr_8_lsb = (addr & I2C_ADDR_MSK);
> + iowrite32(addr_8_lsb, p + PCH_I2CDR);
> + } else {
> + pch_i2c_stop(adap);
> + return -ETIME;
> + }
> + } else {
> + /* set 7 bit slave address and R/W bit as 0 */
> + iowrite32(addr << 1, p + PCH_I2CDR);
> + if (first)
> + pch_i2c_start(adap);
> + }
> +
> + if ((pch_i2c_wait_for_xfer_complete(adap) == 0) &&
> + (pch_i2c_getack(adap) == 0)) {
> + for (wrcount = 0; wrcount < length; ++wrcount) {
> + /* write buffer value to I2C data register */
> + iowrite32(buf[wrcount], p + PCH_I2CDR);
> + pch_dbg(adap, "writing %x to Data register\n",
> + buf[wrcount]);
> +
> + if (pch_i2c_wait_for_xfer_complete(adap) != 0)
> + return -ETIME;
> +
> + if (pch_i2c_getack(adap))
> + return -EIO;
> + }
> +
> + /* check if this is the last message */
> + if (last)
> + pch_i2c_stop(adap);
> + else
> + pch_i2c_repstart(adap);
> + } else {
> + pch_i2c_stop(adap);
> + return -EIO;
> + }
> +
> + pch_dbg(adap, "return=%d\n", wrcount);
> +
> + return wrcount;
> +}
> +
> +/**
> + * pch_i2c_sendack() - send ACK
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + */
> +static void pch_i2c_sendack(struct i2c_algo_pch_data *adap)
> +{
> + void __iomem *p = adap->pch_base_address;
> + pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
> + pch_clrbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK);
> +}
> +
> +/**
> + * pch_i2c_sendnack() - send NACK
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + */
> +static void pch_i2c_sendnack(struct i2c_algo_pch_data *adap)
> +{
> + void __iomem *p = adap->pch_base_address;
> + pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
> + pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK);
> +}
> +
> +/**
> + * pch_i2c_readbytes() - read data from I2C bus in normal mode.
> + * @i2c_adap: Pointer to the struct i2c_adapter.
> + * @msgs: Pointer to i2c_msg structure.
> + * @last: specifies whether last message or not.
> + * @first: specifies whether first message or not.
> + */
> +s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
> + u32 last, u32 first)
> +{
> + struct i2c_algo_pch_data *adap = i2c_adap->algo_data;
> +
> + u8 *buf;
> + u32 count;
> + u32 length;
> + u32 addr;
> + u32 addr_2_msb;
> + void __iomem *p = adap->pch_base_address;
> +
> + length = msgs->len;
> + buf = msgs->buf;
> + addr = msgs->addr;
> +
> + /* enable master reception */
> + pch_clrbit(adap->pch_base_address, PCH_I2CCTL, I2C_TX_MODE);
> +
> + if (first) {
> + if (pch_i2c_wait_for_bus_idle(adap, BUS_IDLE_TIMEOUT) == -ETIME)
> + return -ETIME;
> + }
> +
> + if (msgs->flags & I2C_M_TEN) {
> + addr_2_msb = (((addr & I2C_MSB_2B_MSK) >> 7) | (I2C_RD));
> + iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR);
> +
> + } else {
> + /* 7 address bits + R/W bit */
> + addr = (((addr) << 1) | (I2C_RD));
> + iowrite32(addr, p + PCH_I2CDR);
> + }
> +
> + /* check if it is the first message */
> + if (first)
> + pch_i2c_start(adap);
> +
> + if ((pch_i2c_wait_for_xfer_complete(adap) == 0) &&
> + (pch_i2c_getack(adap) == 0)) {
> + pch_dbg(adap, "return %d\n", 0);
> +
> + if (length == 0) {
> + pch_i2c_stop(adap);
> + ioread32(p + PCH_I2CDR); /* Dummy read needs */
> +
> + count = length;
> + } else {
> + int read_index;
> + int loop;
> + pch_i2c_sendack(adap);
> +
> + /* Dummy read */
> + for (loop = 1, read_index = 0; loop < length; loop++) {
> + buf[read_index] = ioread32(p + PCH_I2CDR);
> +
> + if (loop != 1)
> + read_index++;
> +
> + if (pch_i2c_wait_for_xfer_complete(adap) != 0) {
> + pch_i2c_stop(adap);
> + return -ETIME;
> + }
> + } /* end for */
> +
> + pch_i2c_sendnack(adap);
> +
> + buf[read_index] = ioread32(p + PCH_I2CDR);
> +
> + if (length != 1)
> + read_index++;
> +
> + if (pch_i2c_wait_for_xfer_complete(adap) == 0) {
> + if (last)
> + pch_i2c_stop(adap);
> + else
> + pch_i2c_repstart(adap);
> +
> + buf[read_index++] = ioread32(p + PCH_I2CDR);
> + count = read_index;
> + } else {
> + count = -ETIME;
> + }
> +
> + }
> + } else {
> + count = -ETIME;
> + pch_i2c_stop(adap);
> + }
> +
> + return count;
> +}
> +
> +/**
> + * pch_i2c_cb_ch0() - Interrupt handler Call back function
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + */
> +static void pch_i2c_cb_ch0(struct i2c_algo_pch_data *adap)
> +{
> + u32 sts;
> + void __iomem *p = adap->pch_base_address;
> +
> + sts = ioread32(p + PCH_I2CSR);
> + sts &= (I2CMAL_BIT | I2CMCF_BIT | I2CMIF_BIT);
> + if (sts & I2CMAL_BIT)
> + adap->pch_event_flag |= I2CMAL_EVENT;
> +
> + if (sts & I2CMCF_BIT)
> + adap->pch_event_flag |= I2CMCF_EVENT;
> +
> + /* clear the applicable bits */
> + pch_clrbit(adap->pch_base_address, PCH_I2CSR, sts);
> +
> + pch_dbg(adap, "PCH_I2CSR = %x\n", ioread32(p + PCH_I2CSR));
> +
> + wake_up(&pch_event);
> +}
> +
> +/**
> + * pch_i2c_handler() - interrupt handler for the PCH I2C controller
> + * @irq: irq number.
> + * @pData: cookie passed back to the handler function.
> + */
> +static irqreturn_t pch_i2c_handler(int irq, void *pData)
> +{
> + s32 reg_val;
> +
> + struct i2c_algo_pch_data *adap_data = (struct i2c_algo_pch_data
> *)pData;
> + void __iomem *p = adap_data->pch_base_address;
> + u32 mode = ioread32(p + PCH_I2CMOD) & (BUFFER_MODE |
> EEPROM_SR_MODE);
> +
> + if (mode != NORMAL_MODE) {
> + pch_err(adap_data, "I2C mode is not supported\n");
> + return IRQ_NONE;
> + }
> +
> + reg_val = ioread32(p + PCH_I2CSR);
> + if (reg_val & (I2CMAL_BIT | I2CMCF_BIT | I2CMIF_BIT))
> + pch_i2c_cb_ch0(adap_data);
> + else
> + return IRQ_NONE;
> +
> + return IRQ_HANDLED;
> +}
> +
> +/**
> + * pch_i2c_xfer() - Reading adnd writing data through I2C bus
> + * @i2c_adap: Pointer to the struct i2c_adapter.
> + * @msgs: Pointer to i2c_msg structure.
> + * @num: number of messages.
> + */
> +static s32 pch_i2c_xfer(struct i2c_adapter *i2c_adap,
> + struct i2c_msg *msgs, s32 num)
> +{
> + struct i2c_msg *pmsg;
> + u32 i = 0;
> + u32 status;
> + u32 msglen;
> + u32 subaddrlen;
> + s32 ret;
> +
> + struct i2c_algo_pch_data *adap = i2c_adap->algo_data;
> +
> + ret = mutex_lock_interruptible(&pch_mutex);
> + if (ret)
> + return -ERESTARTSYS;
> +
> + if (adap->p_adapter_info->pch_i2c_suspended) {
> + mutex_unlock(&pch_mutex);
> + return -EBUSY;
> + }
> +
> + pch_dbg(adap, "adap->p_adapter_info->pch_i2c_suspended is %d\n",
> + adap->p_adapter_info->pch_i2c_suspended);
> + /* transfer not completed */
> + adap->pch_i2c_xfer_in_progress = true;
> +
> + pmsg = &msgs[0];
> + pmsg->flags |= adap->pch_buff_mode_en;
> + status = pmsg->flags;
> + pch_dbg(adap,
> + "After invoking I2C_MODE_SEL :flag= 0x%x\n", status);
> + /* calculate sub address length and message length */
> + /* these are applicable only for buffer mode */
> + subaddrlen = pmsg->buf[0];
> + /* calculate actual message length excluding
> + * the sub address fields */
> + msglen = (pmsg->len) - (subaddrlen + 1);
> + if (status & (I2C_M_RD)) {
> + pch_dbg(adap, "invoking pch_i2c_readbytes\n");
> + ret = pch_i2c_readbytes(i2c_adap, pmsg, (i + 1 == num),
> + (i == 0));
> + } else {
> + pch_dbg(adap, "invoking pch_i2c_writebytes\n");
> + ret = pch_i2c_writebytes(i2c_adap, pmsg, (i + 1 == num),
> + (i == 0));
> + }
> +
> + adap->pch_i2c_xfer_in_progress = false; /* transfer completed */
> +
> + mutex_unlock(&pch_mutex);
> +
> + return ret;
> +}
> +
> +/**
> + * pch_i2c_func() - return the functionality of the I2C driver
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + */
> +static u32 pch_i2c_func(struct i2c_adapter *adap)
> +{
> + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
> I2C_FUNC_10BIT_ADDR;
> +}
> +
> +static struct i2c_algorithm pch_algorithm = {
> + .master_xfer = pch_i2c_xfer,
> + .functionality = pch_i2c_func
> +};
> +
> +/**
> + * pch_i2c_disbl_int() - Disable PCH I2C interrupts
> + * @adap: Pointer to struct i2c_algo_pch_data.
> + */
> +static void pch_i2c_disbl_int(struct i2c_algo_pch_data *adap)
> +{
> + void __iomem *p = adap->pch_base_address;
> +
> + pch_clrbit(adap->pch_base_address, PCH_I2CCTL,
> NORMAL_INTR_ENBL);
> +
> + iowrite32(EEPROM_RST_INTR_DISBL, p + PCH_I2CESRMSK);
> +
> + iowrite32(BUFFER_MODE_INTR_DISBL, p + PCH_I2CBUFMSK);
> +}
> +
> +static int __devinit pch_i2c_probe(struct pci_dev *pdev,
> + const struct pci_device_id *id)
> +{
> + void __iomem *base_addr;
> + s32 ret;
> + struct adapter_info *adap_info;
> +
> + pch_pci_dbg(pdev, "Entered.\n");
> +
> + adap_info = kzalloc((sizeof(struct adapter_info)), GFP_KERNEL);
> + if (adap_info == NULL) {
> + pch_pci_err(pdev, "Memory allocation FAILED\n");
> + return -ENOMEM;
> + }
> +
> + ret = pci_enable_device(pdev);
> + if (ret) {
> + pch_pci_err(pdev, "pci_enable_device FAILED\n");
> + goto err_pci_enable;
> + }
> +
> + ret = pci_request_regions(pdev, KBUILD_MODNAME);
> + if (ret) {
> + pch_pci_err(pdev, "pci_request_regions FAILED\n");
> + goto err_pci_req;
> + }
> +
> + base_addr = pci_iomap(pdev, 1, 0);
> +
> + if (base_addr == NULL) {
> + pch_pci_err(pdev, "pci_iomap FAILED\n");
> + ret = -ENOMEM;
> + goto err_pci_iomap;
> + }
> +
> + adap_info->pch_i2c_suspended = false;
> +
> + adap_info->pch_data.p_adapter_info = adap_info;
> +
> + adap_info->pch_data.pch_adapter.owner = THIS_MODULE;
> + adap_info->pch_data.pch_adapter.class = I2C_CLASS_HWMON;
> + strcpy(adap_info->pch_data.pch_adapter.name, KBUILD_MODNAME);
> + adap_info->pch_data.pch_adapter.algo = &pch_algorithm;
> + adap_info->pch_data.pch_adapter.algo_data =
> + &adap_info->pch_data;
> +
> + /* (i * 0x80) + base_addr; */
> + adap_info->pch_data.pch_base_address = base_addr;
> +
> + adap_info->pch_data.pch_adapter.dev.parent = &pdev->dev;
> +
> + ret = i2c_add_adapter(&(adap_info->pch_data.pch_adapter));
> +
> + if (ret) {
> + pch_pci_err(pdev, "i2c_add_adapter FAILED\n");
> + goto err_i2c_add_adapter;
> + }
> +
> + pch_i2c_init(&adap_info->pch_data);
> + ret = request_irq(pdev->irq, pch_i2c_handler, IRQF_SHARED,
> + KBUILD_MODNAME, &adap_info->pch_data);
> + if (ret) {
> + pch_pci_err(pdev, "request_irq FAILED\n");
> + goto err_request_irq;
> + }
> +
> + pci_set_drvdata(pdev, adap_info);
> + pch_pci_dbg(pdev, "returns %d.\n", ret);
> + return 0;
> +
> +err_request_irq:
> + i2c_del_adapter(&(adap_info->pch_data.pch_adapter));
> +err_i2c_add_adapter:
> + pci_iounmap(pdev, base_addr);
> +err_pci_iomap:
> + pci_release_regions(pdev);
> +err_pci_req:
> + pci_disable_device(pdev);
> +err_pci_enable:
> + kfree(adap_info);
> + return ret;
> +}
> +
> +static void __devexit pch_i2c_remove(struct pci_dev *pdev)
> +{
> + struct adapter_info *adap_info = pci_get_drvdata(pdev);
> +
> + pch_i2c_disbl_int(&adap_info->pch_data);
> + free_irq(pdev->irq, &adap_info->pch_data);
> + i2c_del_adapter(&(adap_info->pch_data.pch_adapter));
> +
> + if (adap_info->pch_data.pch_base_address) {
> + pci_iounmap(pdev, adap_info->pch_data.pch_base_address);
> + adap_info->pch_data.pch_base_address = 0;
> + }
> +
> + pci_set_drvdata(pdev, NULL);
> +
> + pci_release_regions(pdev);
> +
> + pci_disable_device(pdev);
> + kfree(adap_info);
> +}
> +
> +#ifdef CONFIG_PM
> +static int pch_i2c_suspend(struct pci_dev *pdev, pm_message_t state)
> +{
> + int ret;
> + struct adapter_info *adap_info = pci_get_drvdata(pdev);
> + void __iomem *p = adap_info->pch_data.pch_base_address;
> +
> + adap_info->pch_i2c_suspended = true;
> +
> + while ((adap_info->pch_data.pch_i2c_xfer_in_progress)) {
> + /* Wait until all channel transfers are completed */
> + msleep(20);
> + }
> + /* Disable the i2c interrupts */
> + pch_i2c_disbl_int(&adap_info->pch_data);
> +
> + pch_pci_dbg(pdev, "I2CSR = %x I2CBUFSTA = %x I2CESRSTA = %x "
> + "invoked function pch_i2c_disbl_int successfully\n",
> + ioread32(p + PCH_I2CSR), ioread32(p + PCH_I2CBUFSTA),
> + ioread32(p + PCH_I2CESRSTA));
> +
> + ret = pci_save_state(pdev);
> +
> + if (ret) {
> + pch_pci_err(pdev, "pci_save_state\n");
> + return ret;
> + }
> +
> + pci_enable_wake(pdev, PCI_D3hot, 0);
> + pci_disable_device(pdev);
> + pci_set_power_state(pdev, pci_choose_state(pdev, state));
> +
> + return 0;
> +}
> +
> +static int pch_i2c_resume(struct pci_dev *pdev)
> +{
> + struct adapter_info *adap_info = pci_get_drvdata(pdev);
> +
> + pci_set_power_state(pdev, PCI_D0);
> + pci_restore_state(pdev);
> +
> + if (pci_enable_device(pdev) < 0) {
> + pch_pci_err(pdev, "pch_i2c_resume:pci_enable_device FAILED\n");
> + return -EIO;
> + }
> +
> + pci_enable_wake(pdev, PCI_D3hot, 0);
> +
> + pch_i2c_init(&adap_info->pch_data);
> +
> + adap_info->pch_i2c_suspended = false;
> +
> + return 0;
> +}
> +#else
> +#define pch_i2c_suspend NULL
> +#define pch_i2c_resume NULL
> +#endif
> +
> +static struct pci_driver pch_pcidriver = {
> + .name = KBUILD_MODNAME,
> + .id_table = pch_pcidev_id,
> + .probe = pch_i2c_probe,
> + .remove = __devexit_p(pch_i2c_remove),
> + .suspend = pch_i2c_suspend,
> + .resume = pch_i2c_resume
> +};
> +
> +static int __init pch_pci_init(void)
> +{
> + return pci_register_driver(&pch_pcidriver);
> +}
> +module_init(pch_pci_init);
> +
> +static void __exit pch_pci_exit(void)
> +{
> + pci_unregister_driver(&pch_pcidriver);
> +}
> +module_exit(pch_pci_exit);
> +
> +MODULE_DESCRIPTION("PCH I2C PCI Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Tomoya MORINAGA.
> <tomoya-linux@xxxxxxxxxxxxxxx>");
> +module_param(pch_i2c_speed, int, (S_IRUSR | S_IWUSR));
> +module_param(pch_clk, int, (S_IRUSR | S_IWUSR));
> --
> 1.6.0.6
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