>From f5ace22d5aec5e62b6110e3a61f03ca04eaffafb Mon Sep 17 00:00:00 2001
From: Wen Wang <wen.w.wang@xxxxxxxxx>
Date: Thu, 14 May 2009 14:56:44 +0800
Subject: [PATCH] Patch for Moorestown I2C controller driver
Signed-off-by: Wen Wang <wen.w.wang@xxxxxxxxx>
---
drivers/i2c/busses/Kconfig | 10 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-moorestown.c | 778 +++++++++++++++++++++++++++++++++++
drivers/i2c/busses/i2c-moorestown.h | 259 ++++++++++++
4 files changed, 1048 insertions(+), 0 deletions(-)
create mode 100644 drivers/i2c/busses/i2c-moorestown.c
create mode 100755 drivers/i2c/busses/i2c-moorestown.h
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index a48c8ae..cf84038 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -738,4 +738,14 @@ config SCx200_ACB
This support is also available as a module. If so, the module
will be called scx200_acb.
+config I2C_MOORESTOWN
+ tristate "Intel Moorestown I2C Controller"
+ depends on PCI && GPIOLIB
+ default y
+ help
+ If you say yes to this option, support will be included for the Intel
+ Moorestown chipset I2C controller.
+ This driver can also be built as a module. If so, the module
+ will be called i2c-moorestown.
+
endmenu
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 776acb6..9d5f89c 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_I2C_SIBYTE) += i2c-sibyte.o
obj-$(CONFIG_I2C_STUB) += i2c-stub.o
obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
obj-$(CONFIG_SCx200_I2C) += scx200_i2c.o
+obj-$(CONFIG_I2C_MOORESTOWN) += i2c-moorestown.o
ifeq ($(CONFIG_I2C_DEBUG_BUS),y)
EXTRA_CFLAGS += -DDEBUG
diff --git a/drivers/i2c/busses/i2c-moorestown.c b/drivers/i2c/busses/i2c-moorestown.c
new file mode 100644
index 0000000..ab8a619
--- /dev/null
+++ b/drivers/i2c/busses/i2c-moorestown.c
@@ -0,0 +1,778 @@
+/*
+ * Support for Moorestown I2C controller
+ *
+ * Copyright (c) 2009 Intel Corporation.
+ * Copyright (c) 2009 Synopsys. Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License, version
+ * 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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., 51
+ * Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+
+#include "i2c-moorestown.h"
+
+#define MAX_T_POLL_COUNT 10000 /* FIXME */
+#define DEF_BAR 0
+#define VERSION "Version 0.5"
+
+#define mrst_i2c_read(reg) __raw_readl(reg)
+#define mrst_i2c_write(reg, val) __raw_writel((val), (reg))
+
+static int speed_mode = STANDARD;
+module_param(speed_mode, int, S_IRUGO);
+
+/**
+ * mrst_i2c_disable - Disable I2C controller
+ * @adap: struct pointer to i2c_adapter
+ *
+ * Return Value:
+ * 0 success
+ * -EBUSY if device is busy
+ * -ETIMEOUT if i2c cannot be disabled within the given time
+ *
+ * I2C bus state should be checked prior to disabling the hardware. If bus is
+ * not in idle state, an errno is returned. Write "0" to IC_ENABLE to disable
+ * I2C controller.
+ */
+static int mrst_i2c_disable(struct i2c_adapter *adap)
+{
+ struct mrst_i2c_private *i2c =
+ (struct mrst_i2c_private *)i2c_get_adapdata(adap);
+ int count = 0;
+
+ /* Check if device is busy */
+ dev_dbg(&adap->dev, "mrst i2c disable\n");
+ while (mrst_i2c_read(i2c->base + IC_STATUS) & 0x1) {
+ dev_dbg(&adap->dev, "i2c is busy, count is %d\n", count);
+ if (count++ > MAX_T_POLL_COUNT)
+ return -EBUSY;
+ }
+
+ /* Set IC_ENABLE to 0 */
+ mrst_i2c_write(i2c->base + IC_ENABLE, 0);
+
+ /* Disable all interupts */
+ mrst_i2c_write(i2c->base + IC_INTR_MASK, 0x0000);
+
+ /* Clear all interrupts */
+ mrst_i2c_read(i2c->base + IC_CLR_INTR);
+
+ return 0;
+}
+
+/**
+ * mrst_i2c_hwinit - Initiate the I2C hardware registers. This function will
+ * be called in mrst_i2c_probe() before device registration.
+ * @dev: pci device struct pointer
+ *
+ * Return Values:
+ * 0 success
+ * -EBUSY i2c cannot be disabled
+ * -ETIMEDOUT i2c cannot be disabled
+ * -EFAULT If APB data width is not 32-bit wide
+ *
+ * I2C should be disabled prior to other register operation. If failed, an
+ * errno is returned. Mask and Clear all interrpts, this should be done at
+ * first. Set common registers which will not be modified during normal
+ * transfers, including: controll register, FIFO threshold and clock freq.
+ * Check APB data width at last.
+ */
+static int __devinit mrst_i2c_hwinit(struct pci_dev *dev)
+{
+ struct mrst_i2c_private *i2c =
+ (struct mrst_i2c_private *)pci_get_drvdata(dev);
+ int err = 0;
+
+ /* Disable i2c first */
+ err = mrst_i2c_disable(i2c->adap);
+ if (err)
+ return err;
+
+ /* Disable all interupts */
+ mrst_i2c_write(i2c->base + IC_INTR_MASK, 0x0000);
+
+ /* Clear all interrupts */
+ mrst_i2c_read(i2c->base + IC_CLR_INTR);
+
+ /*
+ * Setup clock frequency and speed mode
+ * Enable restart condition,
+ * enable master FSM, disable slave FSM,
+ * use target address when initiating transfer
+ */
+ switch (speed_mode) {
+ case STANDARD:
+ mrst_i2c_write(i2c->base + IC_CON,
+ SLV_DIS | RESTART | STANDARD_MODE | MASTER_EN);
+ mrst_i2c_write(i2c->base + IC_SS_SCL_HCNT, 0x75);
+ mrst_i2c_write(i2c->base + IC_SS_SCL_LCNT, 0x7c);
+ break;
+ case FAST:
+ mrst_i2c_write(i2c->base + IC_CON,
+ SLV_DIS | RESTART | FAST_MODE | MASTER_EN);
+ mrst_i2c_write(i2c->base + IC_SS_SCL_HCNT, 0x15);
+ mrst_i2c_write(i2c->base + IC_SS_SCL_LCNT, 0x21);
+ break;
+ case HIGH:
+ mrst_i2c_write(i2c->base + IC_CON,
+ SLV_DIS | RESTART | HIGH_MODE | MASTER_EN);
+ mrst_i2c_write(i2c->base + IC_SS_SCL_HCNT, 0x7);
+ mrst_i2c_write(i2c->base + IC_SS_SCL_LCNT, 0xE);
+ break;
+ default:
+ ;
+ }
+
+ /* Set tranmit & receive FIFO threshold to zero */
+ mrst_i2c_write(i2c->base + IC_RX_TL, 0x3);
+ mrst_i2c_write(i2c->base + IC_TX_TL, 0x3);
+
+ mrst_i2c_write(i2c->base + IC_ENABLE, 1);
+
+ return err;
+}
+
+/**
+ * mrst_i2c_func - Return the supported three I2C operations.
+ * @adapter: i2c_adapter struct pointer
+ */
+static u32 mrst_i2c_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
+}
+
+/**
+ * mrst_i2c_invalid_address - To check if the address in i2c message is
+ * correct.
+ * @p: i2c_msg struct pointer
+ *
+ * Return Values:
+ * 0 if the address is valid
+ * 1 if the address is invalid
+ */
+static inline int mrst_i2c_invalid_address(const struct i2c_msg *p)
+{
+ int ret = ((p->addr > 0x3ff) || (!(p->flags & I2C_M_TEN)
+ && (p->addr > 0x7f)));
+ return ret;
+}
+
+/**
+ * mrst_i2c_address_neq - To check if the addresses for different i2c messages
+ * are equal.
+ * @p1: first i2c_msg
+ * @p2: second i2c_msg
+ *
+ * Return Values:
+ * 0 if addresse are equal
+ * 1 if not equal
+ *
+ * Within a single transfer, I2C client may need to send its address more
+ * than one time. So a check for the address equation is needed.
+ */
+static inline int mrst_i2c_address_neq(const struct i2c_msg *p1,
+ const struct i2c_msg *p2)
+{
+ int ret = ((p1->addr != p2->addr) || ((p1->flags & (I2C_M_TEN))
+ != ((p2->flags) & (I2C_M_TEN))));
+ return ret;
+}
+
+/**
+ * mrst_i2c_abort - To handle transfer abortions and print error messages.
+ * @adap: i2c_adapter struct pointer
+ *
+ * By reading register IC_TX_ABRT_SOURCE, various transfer errors can be
+ * distingushed. At present, no circumstances have been found out that
+ * multiple errors would be occured simutaneously, so we simply use the
+ * register value directly.
+ *
+ * At last the error bits are cleared. (Note clear ABRT_SBYTE_NORSTRT bit need
+ * a few extra steps)
+ */
+static void mrst_i2c_abort(struct i2c_adapter *adap)
+{
+ struct mrst_i2c_private *i2c = (struct mrst_i2c_private *)
+ i2c_get_adapdata(adap);
+
+ /* Read about source register */
+ int abort = mrst_i2c_read(i2c->base + IC_TX_ABRT_SOURCE);
+
+ dev_dbg(&adap->dev, "Abort: ");
+
+ /* Single transfer error check:
+ * According to databook, TX/RX FIFOs would be flushed when
+ * the abort interrupt occured.
+ */
+ switch (abort) {
+ case (ABRT_MASTER_DIS):
+ dev_err(&adap->dev,
+ "initiate Master operation with Master mode"
+ "disabled.\n");
+
+ break;
+ case (ABRT_10B_RD_NORSTRT):
+ dev_err(&adap->dev,
+ "RESTART disabled and master sends READ cmd in 10-BIT"
+ "addressing.\n");
+ break;
+ case (ABRT_SBYTE_NORSTRT):
+ dev_err(&adap->dev,
+ "RESTART disabled and user is trying to send START"
+ "byte.\n");
+ /* Page 141 data book */
+ mrst_i2c_write(i2c->base + IC_TX_ABRT_SOURCE,
+ !(ABRT_SBYTE_NORSTRT));
+ mrst_i2c_write(i2c->base + IC_CON, RESTART);
+ mrst_i2c_write(i2c->base + IC_TAR, !(IC_TAR_SPECIAL));
+ break;
+ case (ABRT_SBYTE_ACKDET):
+ dev_err(&adap->dev,
+ "START byte was acknowledged.\n");
+ break;
+ case (ABRT_TXDATA_NOACK):
+ dev_err(&adap->dev,
+ "No acknowledge received from slave.\n");
+ break;
+ case (ABRT_10ADDR2_NOACK):
+ dev_err(&adap->dev,
+ "The 2nd address byte of 10-bit address not"
+ "acknowledged.\n");
+ break;
+ case (ABRT_10ADDR1_NOACK):
+ dev_dbg(&adap->dev,
+ "The 1st address byte of 10-bit address not"
+ "acknowledged.\n");
+ break;
+ case (ABRT_7B_ADDR_NOACK):
+ dev_err(&adap->dev,
+ "7-bit address not acknowledged.\n");
+ break;
+ default:
+ ;;
+ }
+
+ /* Clear TX_ABRT bit */
+ mrst_i2c_read(i2c->base + IC_CLR_TX_ABRT);
+}
+
+/**
+ * xfer_read - Internal function to implement master read transfer.
+ * @adap: i2c_adapter struct pointer
+ * @buf: buffer in i2c_msg
+ * @length: number of bytes to be read
+ *
+ * Return Values:
+ * 0 if the read transfer succeeds
+ * -ETIMEDOUT if cannot read the "raw" interrupt register
+ * -EINVAL if transfer abort occured
+ *
+ * For every byte, a "READ" command will be loaded into IC_DATA_CMD prior to
+ * data transfer. The actual "read" operation will be performed if the RX_FULL
+ * interrupt is occured.
+ *
+ * Note there may be two interrupt signals captured, one should read
+ * IC_RAW_INTR_STAT to seperate between errors and actual data.
+ */
+static int xfer_read(struct i2c_adapter *adap, unsigned char *buf, int length)
+{
+ struct mrst_i2c_private *i2c = (struct mrst_i2c_private *)
+ i2c_get_adapdata(adap);
+ uint32_t reg_val;
+ int i = length;
+ unsigned count = 0;
+ uint32_t bit_get = 1 << 3; /* receive fifo not empty */
+
+ while (i--)
+ mrst_i2c_write(i2c->base + IC_DATA_CMD, (uint16_t)0x100);
+
+ i = length;
+ while (i--) {
+ count = 0;
+ reg_val = mrst_i2c_read(i2c->base + IC_STATUS);
+ while ((reg_val & bit_get) == 0) {
+ reg_val = mrst_i2c_read(i2c->base + IC_RAW_INTR_STAT);
+ if ((reg_val & 0x40) == 0x40)
+ goto read_abrt;
+ reg_val = mrst_i2c_read(i2c->base + IC_STATUS);
+ if (count++ > MAX_T_POLL_COUNT)
+ goto read_loop;
+ }
+
+ reg_val = mrst_i2c_read(i2c->base + IC_DATA_CMD);
+ *buf++ = reg_val;
+ }
+
+ return 0;
+
+read_loop:
+ dev_err(&adap->dev, "Time out in read\n");
+ return -ETIMEDOUT;
+read_abrt:
+ dev_err(&adap->dev, "Abort from read\n");
+ mrst_i2c_abort(adap);
+ return -EINVAL;
+}
+
+/**
+ * xfer_write - Internal function to implement master write transfer.
+ * @adap: i2c_adapter struct pointer
+ * @buf: buffer in i2c_msg
+ * @length: number of bytes to be read
+ *
+ * Return Values:
+ * 0 if the read transfer succeeds
+ * -ETIMEDOUT if cannot read the "raw" interrupt register
+ * -EINVAL if transfer abort occured
+ *
+ * For every byte, a "WRITE" command will be loaded into IC_DATA_CMD prior to
+ * data transfer. The actual "write" operation will be performed if the
+ * RX_FULL interrupt siganal is occured.
+ *
+ * Note there may be two interrupt signals captured, one should read
+ * IC_RAW_INTR_STAT to seperate between errors and actual data.
+ */
+static int xfer_write(struct i2c_adapter *adap,
+ unsigned char *buf, int length)
+{
+ struct mrst_i2c_private *i2c = (struct mrst_i2c_private *)
+ i2c_get_adapdata(adap);
+
+ int i;
+ uint32_t reg_val;
+ unsigned count = 0;
+ uint32_t bit_get = 1 << 2; /* transmit fifo completely empty */
+
+ for (i = 0; i < length; i++)
+ mrst_i2c_write(i2c->base + IC_DATA_CMD,
+ (uint16_t)(*(buf + i)));
+
+ reg_val = mrst_i2c_read(i2c->base + IC_STATUS);
+ while ((reg_val & bit_get) == 0) {
+ if (count++ > MAX_T_POLL_COUNT)
+ goto write_loop;
+ reg_val = mrst_i2c_read(i2c->base + IC_STATUS);
+ }
+
+ udelay(speed_mode);
+ reg_val = mrst_i2c_read(i2c->base + IC_RAW_INTR_STAT);
+ if ((reg_val & 0x40) == 0x40)
+ goto write_abrt;
+
+ return 0;
+
+write_loop:
+ dev_err(&adap->dev, "Time out in write\n");
+ return -ETIMEDOUT;
+write_abrt:
+ dev_err(&adap->dev, "Abort from write\n");
+ mrst_i2c_abort(adap);
+ return -EINVAL;
+}
+
+static int mrst_i2c_setup(struct i2c_adapter *adap, struct i2c_msg *pmsg)
+{
+ struct mrst_i2c_private *i2c =
+ (struct mrst_i2c_private *)i2c_get_adapdata(adap);
+ int err;
+ uint32_t reg_val;
+
+ /* Disable device first */
+ err = mrst_i2c_disable(adap);
+ if (err) {
+ dev_err(&adap->dev,
+ "Cannot disable i2c controller, timeout!\n");
+ return -ETIMEDOUT;
+ }
+
+ reg_val = mrst_i2c_read(i2c->base + IC_ENABLE);
+ if (reg_val & 0x1) {
+ dev_dbg(&adap->dev, "i2c busy, can't setup\n");
+ return -EINVAL;
+ }
+
+ /* Note here we have a change */
+ switch (speed_mode) {
+ case STANDARD:
+ reg_val = SLV_DIS | RESTART | STANDARD_MODE | MASTER_EN;
+ break;
+ case FAST:
+ reg_val = SLV_DIS | RESTART | FAST_MODE | MASTER_EN;
+ break;
+ case HIGH:
+ reg_val = SLV_DIS | RESTART | HIGH_MODE | MASTER_EN;
+ break;
+ default:
+ ;
+ }
+
+ reg_val = reg_val | (pmsg->flags & I2C_M_TEN ? 1 : 0) << 4;
+ mrst_i2c_write(i2c->base + IC_CON, reg_val);
+
+ /* set target address to the I2C slave address */
+ dev_dbg(&adap->dev, "set target address to the I2C slave address,"
+ "addr is %x\n", pmsg->addr);
+ reg_val = ((pmsg->addr & 0x3ff) |
+ (pmsg->flags & I2C_M_TEN ? IC_TAR_10BIT_ADDR : 0));
+ mrst_i2c_write(i2c->base + IC_TAR, reg_val);
+
+ /* Enable I2C controller */
+ mrst_i2c_write(i2c->base + IC_ENABLE, ENABLE);
+
+ return 0;
+}
+
+/**
+ * mrst_i2c_xfer - Main master transfer routine.
+ * @adap: i2c_adapter struct pointer
+ * @pmsg: i2c_msg struct pointer
+ * @num: number of i2c_msg
+ *
+ * Return Values:
+ * + number of messages transfered
+ * -ETIMEDOUT If cannot disable I2C controller or read IC_STATUS
+ * -EINVAL If the address in i2c_msg is invalid
+ *
+ * This function will be registered in i2c-core and exposed to external
+ * I2C clients.
+ * 1. Disable I2C controller
+ * 2. Unmask three interrupts: RX_FULL, TX_EMPTY, TX_ABRT
+ * 3. Check if address in i2c_msg is valid
+ * 4. Enable I2C controller
+ * 5. Perform real transfer (call xfer_read or xfer_write)
+ * 6. Wait until the current transfer is finished(check bus state)
+ * 7. Mask and clear all interrupts
+ */
+static int mrst_i2c_xfer(struct i2c_adapter *adap,
+ struct i2c_msg *pmsg,
+ int num)
+{
+ struct mrst_i2c_private *i2c =
+ (struct mrst_i2c_private *)i2c_get_adapdata(adap);
+ int i, err;
+
+ dev_dbg(&adap->dev, "mrst_i2c_xfer, process %d msg(s)\n", num);
+ dev_dbg(&adap->dev, KERN_INFO "slave address is %x\n", pmsg->addr);
+
+ /* if number of messages equal 0*/
+ if (num == 0)
+ return 0;
+
+ /* Checked the sanity of passed messages. */
+ if (unlikely(mrst_i2c_invalid_address(&pmsg[0]))) {
+ dev_err(&adap->dev, "Invalid address 0x%03x (%d-bit)\n",
+ pmsg[0].addr, pmsg[0].flags & I2C_M_TEN ? 10 : 7);
+ return -EINVAL;
+ }
+ for (i = 0; i < num; i++) {
+ /* Message address equal? */
+ if (unlikely(mrst_i2c_address_neq(&pmsg[0], &pmsg[i]))) {
+ dev_err(&adap->dev, "Invalid address in msg[%d]\n", i);
+ return -EINVAL;
+ }
+ }
+
+ if (mrst_i2c_setup(adap, pmsg))
+ return -EINVAL;
+
+ for (i = 0; i < num; i++) {
+ dev_dbg(&adap->dev, " #%d: %sing %d byte%s %s 0x%02x\n", i,
+ pmsg->flags & I2C_M_RD ? "read" : "writ",
+ pmsg->len, pmsg->len > 1 ? "s" : "",
+ pmsg->flags & I2C_M_RD ? "from" : "to", pmsg->addr);
+
+
+ /* Read or Write */
+ if (pmsg->len && pmsg->buf) {
+ if (pmsg->flags & I2C_M_RD) {
+ dev_dbg(&adap->dev, "I2C_M_RD\n");
+ err = xfer_read(adap, pmsg->buf, pmsg->len);
+ } else {
+ dev_dbg(&adap->dev, "I2C_M_WR\n");
+ err = xfer_write(adap, pmsg->buf, pmsg->len);
+ }
+ if (err < 0)
+ goto err_1;
+ }
+ dev_dbg(&adap->dev, "msg[%d] transfer complete\n", i);
+ pmsg++; /* next message */
+ }
+ goto exit;
+
+err_1:
+ i = err;
+exit:
+ /* Mask interrupts */
+ mrst_i2c_write(i2c->base + IC_INTR_MASK, 0x0000);
+ /* Clear all interrupts */
+ mrst_i2c_read(i2c->base + IC_CLR_INTR);
+
+ return i;
+}
+
+static int mrst_gpio_init(int sda, int scl)
+{
+ if (gpio_request(sda, "I2C_SDA"))
+ goto err_sda;
+
+ if (gpio_request(scl, "I2C_SCL"))
+ goto err_scl;
+
+ /* TODO: Wait for Moorestown GPIO driver into upstream to uncomment */
+ /*gpio_alt_func(sda, 1);*/
+ /*gpio_alt_func(scl, 1);*/
+
+ return 0;
+err_scl:
+ gpio_free(sda);
+err_sda:
+ return -1;
+}
+
+static struct pci_device_id mrst_i2c_ids[] = {
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0802)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0803)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0804)},
+ {0,}
+};
+MODULE_DEVICE_TABLE(pci, mrst_i2c_ids);
+
+static struct i2c_algorithm mrst_i2c_algorithm = {
+ .master_xfer = mrst_i2c_xfer,
+ .functionality = mrst_i2c_func,
+};
+
+static struct pci_driver mrst_i2c_driver = {
+ .name = "mrst_i2c",
+ .id_table = mrst_i2c_ids,
+ .probe = mrst_i2c_probe,
+ .remove = __devexit_p(mrst_i2c_remove),
+ .suspend = NULL,
+ .resume = NULL,
+};
+
+/**
+ * mrst_i2c_probe - I2C controller initialization routine
+ * @dev: pci device
+ * @id: device id
+ *
+ * Return Values:
+ * 0 success
+ * -ENODEV If cannot allocate pci resource
+ * -ENOMEM If the register base remapping failed, or
+ * if kzalloc failed
+ *
+ * Initialization steps:
+ * 1. Request for PCI resource
+ * 2. Remap the start address of PCI resource to register base
+ * 3. Request for device memory region
+ * 4. Fill in the struct members of mrst_i2c_private
+ * 5. Call mrst_i2c_hwinit() for hardware initialization
+ * 6. Register I2C adapter in i2c-core
+ */
+static int __devinit mrst_i2c_probe(struct pci_dev *dev,
+ const struct pci_device_id *id)
+{
+ struct mrst_i2c_private *mrst;
+ struct i2c_adapter *adap;
+ unsigned int start, len;
+ int err, busnum = 0;
+ void __iomem *base = NULL;
+ int gpio_sda = 0, gpio_scl = 0;
+
+ err = pci_enable_device(dev);
+ if (err) {
+ dev_err(&dev->dev, "Failed to enable I2C PCI device (%d)\n",
+ err);
+ goto exit;
+ }
+
+ /* Determine the address of the I2C area */
+ start = pci_resource_start(dev, DEF_BAR);
+ len = pci_resource_len(dev, DEF_BAR);
+ if (!start || len <= 0) {
+ dev_err(&dev->dev, "Base address initialization failed\n");
+ err = -ENODEV;
+ goto exit;
+ }
+ dev_dbg(&dev->dev, "mrst i2c resource start %x, len=%d\n",
+ start, len);
+ err = pci_request_region(dev, DEF_BAR, mrst_i2c_driver.name);
+ if (err) {
+ dev_err(&dev->dev, "Failed to request I2C region "
+ "0x%1x-0x%Lx\n", start,
+ (unsigned long long)pci_resource_end(dev, DEF_BAR));
+ goto exit;
+ }
+
+ base = ioremap_nocache(start, len);
+ if (!base) {
+ dev_err(&dev->dev, "I/O memory remapping failed\n");
+ err = -ENOMEM;
+ goto fail0;
+ }
+
+ /* Allocate the per-device data structure, mrst_i2c_private */
+ mrst = kzalloc(sizeof(struct mrst_i2c_private), GFP_KERNEL);
+ if (mrst == NULL) {
+ dev_err(&dev->dev, "Can't allocate interface!\n");
+ err = -ENOMEM;
+ goto fail1;
+ }
+
+ adap = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
+ if (adap == NULL) {
+ dev_err(&dev->dev, "Can't allocate interface!\n");
+ err = -ENOMEM;
+ goto fail2;
+ }
+
+ /* Initialize struct members */
+ snprintf(adap->name, sizeof(adap->name), "mrst_i2c");
+ adap->owner = THIS_MODULE;
+ adap->algo = &mrst_i2c_algorithm;
+ adap->class = I2C_CLASS_HWMON;
+ adap->dev.parent = &dev->dev;
+ mrst->adap = adap;
+ mrst->base = base;
+ mrst->speed = speed_mode;
+
+ pci_set_drvdata(dev, mrst);
+ i2c_set_adapdata(adap, mrst);
+
+ /* Initialize i2c controller */
+ err = mrst_i2c_hwinit(dev);
+ if (err < 0) {
+ dev_err(&dev->dev, "I2C interface initialization failed\n");
+ goto fail3;
+ }
+
+ switch (id->device) {
+ case 0x0802:
+ dev_dbg(&adap->dev, KERN_INFO "I2C0\n");
+ gpio_sda = GPIO_I2C_0_SDA;
+ gpio_scl = GPIO_I2C_0_SCL;
+ adap->nr = busnum = 0;
+ break;
+ case 0x0803:
+ dev_dbg(&adap->dev, KERN_INFO "I2C1\n");
+ gpio_sda = GPIO_I2C_1_SDA;
+ gpio_scl = GPIO_I2C_1_SCL;
+ adap->nr = busnum = 1;
+ break;
+ case 0x0804:
+ dev_dbg(&adap->dev, KERN_INFO "I2C2\n");
+ gpio_sda = GPIO_I2C_2_SDA;
+ gpio_scl = GPIO_I2C_2_SCL;
+ adap->nr = busnum = 2;
+ break;
+ default:
+ ;
+ }
+
+ /* Config GPIO pin for I2C */
+ err = mrst_gpio_init(gpio_sda, gpio_scl);
+ if (err) {
+ dev_err(&dev->dev, "GPIO %s registration failed\n",
+ adap->name);
+ goto fail3;
+ }
+
+ /* Adapter registration */
+ err = i2c_add_numbered_adapter(adap);
+ if (err) {
+ dev_err(&dev->dev, "Adapter %s registration failed\n",
+ adap->name);
+ goto fail3;
+ }
+
+ dev_dbg(&dev->dev, "MRST I2C bus %d driver bind success.\n", busnum);
+ return 0;
+
+fail3:
+ i2c_set_adapdata(adap, NULL);
+ pci_set_drvdata(dev, NULL);
+ kfree(adap);
+fail2:
+ kfree(mrst);
+fail1:
+ iounmap(base);
+fail0:
+ pci_release_region(dev, DEF_BAR);
+exit:
+ return err;
+}
+
+static void __devexit mrst_i2c_remove(struct pci_dev *dev)
+{
+ struct mrst_i2c_private *mrst = (struct mrst_i2c_private *)
+ pci_get_drvdata(dev);
+ if (i2c_del_adapter(mrst->adap))
+ dev_err(&dev->dev, "Failed to delete i2c adapter");
+
+ switch (dev->device) {
+ case 0x0802:
+ gpio_free(GPIO_I2C_0_SDA);
+ gpio_free(GPIO_I2C_0_SCL);
+ break;
+ case 0x0803:
+ gpio_free(GPIO_I2C_1_SDA);
+ gpio_free(GPIO_I2C_1_SCL);
+ break;
+ case 0x0804:
+ gpio_free(GPIO_I2C_2_SDA);
+ gpio_free(GPIO_I2C_2_SCL);
+ break;
+ default:
+ break;
+ }
+
+ pci_set_drvdata(dev, NULL);
+ iounmap(mrst->base);
+ kfree(mrst);
+ pci_release_region(dev, DEF_BAR);
+}
+
+static int __init mrst_i2c_init(void)
+{
+ printk(KERN_NOTICE "Moorestown I2C driver %s\n", VERSION);
+ return pci_register_driver(&mrst_i2c_driver);
+}
+
+static void __exit mrst_i2c_exit(void)
+{
+ pci_unregister_driver(&mrst_i2c_driver);
+}
+
+module_init(mrst_i2c_init);
+module_exit(mrst_i2c_exit);
+
+MODULE_AUTHOR("Ba Zheng <zheng.ba@xxxxxxxxx>");
+MODULE_DESCRIPTION("I2C driver for Moorestown Platform");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(VERSION);
diff --git a/drivers/i2c/busses/i2c-moorestown.h b/drivers/i2c/busses/i2c-moorestown.h
new file mode 100755
index 0000000..e2645c0
--- /dev/null
+++ b/drivers/i2c/busses/i2c-moorestown.h
@@ -0,0 +1,259 @@
+#ifndef __I2C_MRST_H
+#define __I2C_MRST_H
+
+#include <linux/i2c.h>
+
+struct mrst_i2c_private {
+ struct i2c_adapter *adap;
+ /* Register base address */
+ void __iomem *base;
+ /* Speed mode */
+ int speed;
+};
+
+/* Speed mode macros */
+#define STANDARD 100
+#define FAST 25
+#define HIGH 3
+
+/* Control register */
+#define IC_CON 0x00
+#define SLV_DIS (1 << 6) /* Disable slave mode */
+#define RESTART (1 << 5) /* Send a Restart condition */
+#define ADDR_10BIT (1 << 4) /* 10-bit addressing */
+#define STANDARD_MODE (1 << 1) /* standard mode */
+#define FAST_MODE (2 << 1) /* fast mode */
+#define HIGH_MODE (3 << 1) /* high speed mode */
+#define MASTER_EN (1 << 0) /* Master mode */
+
+/* Target address register */
+#define IC_TAR 0x04
+#define IC_TAR_10BIT_ADDR (1 << 12) /* 10-bit addressing */
+#define IC_TAR_SPECIAL (1 << 11) /* Perform special I2C cmd */
+#define IC_TAR_GC_OR_START (1 << 10) /* 0: Gerneral Call Address */
+ /* 1: START BYTE */
+
+/* Slave Address Register */
+#define IC_SAR 0x08 /* Not used in Master mode */
+
+/* High Speed Master Mode Code Address Register */
+#define IC_HS_MADDR 0x0c
+
+/* Rx/Tx Data Buffer and Command Register */
+#define IC_DATA_CMD 0x10
+#define IC_RD (1 << 8) /* 1: Read 0: Write */
+
+/* Standard Speed Clock SCL High Count Register */
+#define IC_SS_SCL_HCNT 0x14
+
+/* Standard Speed Clock SCL Low Count Register */
+#define IC_SS_SCL_LCNT 0x18
+
+/* Fast Speed Clock SCL High Count Register */
+#define IC_FS_SCL_HCNT 0x1c
+
+/* Fast Spedd Clock SCL Low Count Register */
+#define IC_FS_SCL_LCNT 0x20
+
+/* High Speed Clock SCL High Count Register */
+#define IC_HS_SCL_HCNT 0x24
+
+/* High Speed Clock SCL Low Count Register */
+#define IC_HS_SCL_LCNT 0x28
+
+/* Interrupt Status Register */
+#define IC_INTR_STAT 0x2c /* Read only */
+#define R_GEN_CALL (1 << 11)
+#define R_START_DET (1 << 10)
+#define R_STOP_DET (1 << 9)
+#define R_ACTIVITY (1 << 8)
+#define R_RX_DONE (1 << 7)
+#define R_TX_ABRT (1 << 6)
+#define R_RD_REQ (1 << 5)
+#define R_TX_EMPTY (1 << 4)
+#define R_TX_OVER (1 << 3)
+#define R_RX_FULL (1 << 2)
+#define R_RX_OVER (1 << 1)
+#define R_RX_UNDER (1 << 0)
+
+/* Interrupt Mask Register */
+#define IC_INTR_MASK 0x30 /* Read and Write */
+#define M_GEN_CALL (1 << 11)
+#define M_START_DET (1 << 10)
+#define M_STOP_DET (1 << 9)
+#define M_ACTIVITY (1 << 8)
+#define M_RX_DONE (1 << 7)
+#define M_TX_ABRT (1 << 6)
+#define M_RD_REQ (1 << 5)
+#define M_TX_EMPTY (1 << 4)
+#define M_TX_OVER (1 << 3)
+#define M_RX_FULL (1 << 2)
+#define M_RX_OVER (1 << 1)
+#define M_RX_UNDER (1 << 0)
+
+/* Raw Interrupt Status Register */
+#define IC_RAW_INTR_STAT 0x34 /* Read Only */
+#define GEN_CALL (1 << 11) /* General call */
+#define START_DET (1 << 10) /* (RE)START occured */
+#define STOP_DET (1 << 9) /* STOP occured */
+#define ACTIVITY (1 << 8) /* Bus busy */
+#define RX_DONE (1 << 7) /* Not used in Master mode */
+#define TX_ABRT (1 << 6) /* Transmit Abort */
+#define RD_REQ (1 << 5) /* Not used in Master mode */
+#define TX_EMPTY (1 << 4) /* TX FIFO <= threshold */
+#define TX_OVER (1 << 3) /* TX FIFO overflow */
+#define RX_FULL (1 << 2) /* RX FIFO >= threshold */
+#define RX_OVER (1 << 1) /* RX FIFO overflow */
+#define RX_UNDER (1 << 0) /* RX FIFO empty */
+
+/* Receive FIFO Threshold Register */
+#define IC_RX_TL 0x38
+
+/* Transmit FIFO Treshold Register */
+#define IC_TX_TL 0x3c
+
+/* Clear Combined and Individual Interrupt Register */
+#define IC_CLR_INTR 0x40
+#define CLR_INTR (1 << 0)
+
+/* Clear RX_UNDER Interrupt Register */
+#define IC_CLR_RX_UNDER 0x44
+#define CLR_RX_UNDER (1 << 0)
+
+/* Clear RX_OVER Interrupt Register */
+#define IC_CLR_RX_OVER 0x48
+#define CLR_RX_OVER (1 << 0)
+
+/* Clear TX_OVER Interrupt Register */
+#define IC_CLR_TX_OVER 0x4c
+#define CLR_TX_OVER (1 << 0)
+
+#define IC_CLR_RD_REQ 0x50
+
+/* Clear TX_ABRT Interrupt Register */
+#define IC_CLR_TX_ABRT 0x54
+#define CLR_TX_ABRT (1 << 0)
+
+#define IC_CLR_RX_DONE 0x58
+
+
+/* Clear ACTIVITY Interrupt Register */
+#define IC_CLR_ACTIVITY 0x5c
+#define CLR_ACTIVITY (1 << 0)
+
+/* Clear STOP_DET Interrupt Register */
+#define IC_CLR_STOP_DET 0x60
+#define CLR_STOP_DET (1 << 0)
+
+/* Clear START_DET Interrupt Register */
+#define IC_CLR_START_DET 0x64
+#define CLR_START_DET (1 << 0)
+
+/* Clear GEN_CALL Interrupt Register */
+#define IC_CLR_GEN_CALL 0x68
+#define CLR_GEN_CALL (1 << 0)
+
+/* Enable Register */
+#define IC_ENABLE 0x6c
+#define ENABLE (1 << 0)
+
+/* Status Register */
+#define IC_STATUS 0x70 /* Read Only */
+#define STAT_SLV_ACTIVITY (1 << 6) /* Slave not in idle */
+#define STAT_MST_ACTIVITY (1 << 5) /* Master not in idle */
+#define STAT_RFF (1 << 4) /* RX FIFO Full */
+#define STAT_RFNE (1 << 3) /* RX FIFO Not Empty */
+#define STAT_TFE (1 << 2) /* TX FIFO Empty */
+#define STAT_TFNF (1 << 1) /* TX FIFO Not Full */
+#define STAT_ACTIVITY (1 << 0) /* Activity Status */
+
+/* Transmit FIFO Level Register */
+#define IC_TXFLR 0x74 /* Read Only */
+#define TXFLR (1 << 0) /* TX FIFO level */
+
+/* Receive FIFO Level Register */
+#define IC_RXFLR 0x78 /* Read Only */
+#define RXFLR (1 << 0) /* RX FIFO level */
+
+/* Transmit Abort Source Register */
+#define IC_TX_ABRT_SOURCE 0x80
+#define ABRT_SLVRD_INTX (1 << 15)
+#define ABRT_SLV_ARBLOST (1 << 14)
+#define ABRT_SLVFLUSH_TXFIFO (1 << 13)
+#define ARB_LOST (1 << 12)
+#define ABRT_MASTER_DIS (1 << 11)
+#define ABRT_10B_RD_NORSTRT (1 << 10)
+#define ABRT_SBYTE_NORSTRT (1 << 9)
+#define ABRT_HS_NORSTRT (1 << 8)
+#define ABRT_SBYTE_ACKDET (1 << 7)
+#define ABRT_HS_ACKDET (1 << 6)
+#define ABRT_GCALL_READ (1 << 5)
+#define ABRT_GCALL_NOACK (1 << 4)
+#define ABRT_TXDATA_NOACK (1 << 3)
+#define ABRT_10ADDR2_NOACK (1 << 2)
+#define ABRT_10ADDR1_NOACK (1 << 1)
+#define ABRT_7B_ADDR_NOACK (1 << 0)
+
+/* Enable Status Register */
+#define IC_ENABLE_STATUS 0x9c
+#define IC_EN (1 << 0) /* I2C in an enabled state */
+
+/* Component Parameter Register 1*/
+#define IC_COMP_PARAM_1 0xf4
+#define APB_DATA_WIDTH (0x3 << 0)
+
+/* GPIO_PINS */
+#define GPIO_I2C_0_SDA 56
+#define GPIO_I2C_0_SCL 57
+
+#define GPIO_I2C_1_SDA 54
+#define GPIO_I2C_1_SCL 55
+
+#define GPIO_I2C_2_SDA 52
+#define GPIO_I2C_2_SCL 53
+
+/* added by xiaolin --begin */
+#define SS_MIN_SCL_HIGH 4000
+#define SS_MIN_SCL_LOW 4700
+#define FS_MIN_SCL_HIGH 600
+#define FS_MIN_SCL_LOW 1300
+#define HS_MIN_SCL_HIGH_100PF 60
+#define HS_MIN_SCL_LOW_100PF 120
+
+enum mrst_i2c_irq {
+ i2c_irq_none = 0x000,
+ i2c_irq_rx_under = 0x001,
+ i2c_irq_rx_over = 0x002,
+ i2c_irq_rx_full = 0x004,
+ i2c_irq_tx_over = 0x008,
+ i2c_irq_tx_empty = 0x010,
+ i2c_irq_rd_req = 0x020,
+ i2c_irq_tx_abrt = 0x040,
+ i2c_irq_rx_done = 0x080,
+ i2c_irq_activity = 0x100,
+ i2c_irq_stop_det = 0x200,
+ i2c_irq_start_det = 0x400,
+ i2c_irq_gen_call = 0x800,
+ i2c_irq_all = 0xfff
+};
+
+/* Function declarations */
+static int mrst_i2c_disable(struct i2c_adapter *);
+static int __devinit mrst_i2c_hwinit(struct pci_dev *);
+static u32 mrst_i2c_func(struct i2c_adapter *);
+static inline int mrst_i2c_invalid_address(const struct i2c_msg *);
+static inline int mrst_i2c_address_neq(const struct i2c_msg *,
+ const struct i2c_msg *);
+static int mrst_i2c_xfer(struct i2c_adapter *,
+ struct i2c_msg *,
+ int);
+static int __devinit mrst_i2c_probe(struct pci_dev *,
+ const struct pci_device_id *);
+static void __devexit mrst_i2c_remove(struct pci_dev *);
+static int __init mrst_i2c_init(void);
+static void __exit mrst_i2c_exit(void);
+static int xfer_read(struct i2c_adapter *,
+ unsigned char *, int);
+static int xfer_write(struct i2c_adapter *,
+ unsigned char *, int);
+#endif /* __I2C_MRST_H */
--
1.5.5.1
>-----Original Message-----
>From: Wang, Wen W
>Sent: 2009年5月14日 15:36
>To: Jean Delvare
>Cc: linux-i2c@xxxxxxxxxxxxxxx; Wang, Wen W
>Subject: [PATCH 0/1] I2C: I2C controller driver for Intel Moorestown platform
>
>Hi Jean,
>
>After a long discussion with other engineers, we finally got parsing I2C device info
>table code out of the I2C controller driver. Here is a description for the patch:
>
>1. Patch for I2C controller driver for Intel low power platform "Moorestown".
>2. The driver depends on a GPIO driver for Intel Moorestown platform.
>3. Patch is based on Linux 2.6.30-rc5.
>4. Patch 1 will:
> a. Add "i2c_moorestown.c" and "i2c_moorestown.h" to kernel directory
>"drivers/i2c/busses"
> b. Add items into kernel files "drivers/i2c/busses/Kconfig" and
>"drivers/i2c/Makefile".
>
>Code for parsing I2C device info table and register the table into I2C core are moved
>into a separate platform driver under arch/ directory per your comments.
>
>Thanks
>Wen
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