i2c-eg20t: add driver for Intel EG20T
I2C driver for Intel EG20T PCH
Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Reviewed-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Qi Wang <qi.wang@intel.com>
[ben-linux@fluff.org: reworded commit message]
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
new file mode 100644
index 0000000..2e067dd
--- /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@dsn.okisemi.com>");
+module_param(pch_i2c_speed, int, (S_IRUSR | S_IWUSR));
+module_param(pch_clk, int, (S_IRUSR | S_IWUSR));