[PATCH v2] i2c-eg20t: support new device OKI SEMICONDUCTOR ML7213 IOH

[Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>]

Support new device OKI SEMICONDUCTOR ML7213 IOH(Input/Output Hub).
The ML7213 IOH, which is for IVI(In-Vehicle Infotainment), is a companion chip
for the Atom E6xx series and compatible with the Intel EG20T PCH.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
---
 drivers/i2c/busses/Kconfig     |    3 +
 drivers/i2c/busses/i2c-eg20t.c |  144 +++++++++++++++++++++++++--------------
 2 files changed, 95 insertions(+), 52 deletions(-)

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 7e18670..5b592df 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -646,6 +646,9 @@ config I2C_EG20T
 	  is an IOH(Input/Output Hub) for x86 embedded processor.
 	  This driver can access PCH I2C bus device.
 
+	  This driver also supports the ML7213, a companion chip for the
+	  Atom E6xx series and compatible with the Intel EG20T PCH.
+
 comment "External I2C/SMBus adapter drivers"
 
 config I2C_PARPORT
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index 2e067dd..59d9123 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -131,6 +131,13 @@
 #define pch_pci_dbg(pdev, fmt, arg...)  \
 	dev_dbg(&pdev->dev, "%s :" fmt, __func__, ##arg)
 
+/*
+Set the number of I2C instance max
+Intel EG20T PCH :		1ch
+OKI SEMICONDUCTOR ML7213 IOH :	2ch
+*/
+#define PCH_I2C_MAX_DEV			2
+
 /**
  * struct i2c_algo_pch_data - for I2C driver functionalities
  * @pch_adapter:		stores the reference to i2c_adapter structure
@@ -155,12 +162,14 @@ struct i2c_algo_pch_data {
  * @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.
+ * @ch_num:		specifies the number of i2c instance
  *
  * pch_data has as many elements as maximum I2C channels
  */
 struct adapter_info {
-	struct i2c_algo_pch_data pch_data;
+	struct i2c_algo_pch_data pch_data[PCH_I2C_MAX_DEV];
 	bool pch_i2c_suspended;
+	int ch_num;
 };
 
 
@@ -169,8 +178,13 @@ static int pch_clk = 50000;	/* specifies I2C clock speed in KHz */
 static wait_queue_head_t pch_event;
 static DEFINE_MUTEX(pch_mutex);
 
+/* Definition for ML7213 by OKI SEMICONDUCTOR */
+#define PCI_VENDOR_ID_ROHM		0x10DB
+#define PCI_DEVICE_ID_ML7213_I2C	0x802D
+
 static struct pci_device_id __devinitdata pch_pcidev_id[] = {
-	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PCH_I2C)},
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_PCH_I2C),   1, },
+	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_I2C), 2, },
 	{0,}
 };
 
@@ -568,10 +582,10 @@ s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
 }
 
 /**
- * pch_i2c_cb_ch0() - Interrupt handler Call back function
+ * pch_i2c_cb() - 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)
+static void pch_i2c_cb(struct i2c_algo_pch_data *adap)
 {
 	u32 sts;
 	void __iomem *p = adap->pch_base_address;
@@ -599,24 +613,31 @@ static void pch_i2c_cb_ch0(struct i2c_algo_pch_data *adap)
  */
 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);
+	u32 reg_val;
+	int flag;
+	int i;
+	struct adapter_info *adap_info = pData;
+	void __iomem *p;
+	u32 mode;
+
+	for (i = 0, flag = 0; i < adap_info->ch_num; i++) {
+		p = adap_info->pch_data[i].pch_base_address;
+		mode = ioread32(p + PCH_I2CMOD);
+		mode &= BUFFER_MODE | EEPROM_SR_MODE;
+		if (mode != NORMAL_MODE) {
+			pch_err(adap_info->pch_data,
+				"I2C-%d mode(%d) is not supported\n", mode, i);
+			continue;
+		}
 
-	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(&adap_info->pch_data[i]);
+			flag = 1;
+		}
 	}
 
-	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;
+	return flag ? IRQ_HANDLED : IRQ_NONE;
 }
 
 /**
@@ -712,8 +733,10 @@ static int __devinit pch_i2c_probe(struct pci_dev *pdev,
 			       const struct pci_device_id *id)
 {
 	void __iomem *base_addr;
-	s32 ret;
+	int ret;
+	int i, j;
 	struct adapter_info *adap_info;
+	struct i2c_adapter *pch_adap;
 
 	pch_pci_dbg(pdev, "Entered.\n");
 
@@ -743,32 +766,36 @@ static int __devinit pch_i2c_probe(struct pci_dev *pdev,
 		goto err_pci_iomap;
 	}
 
-	adap_info->pch_i2c_suspended = false;
+	/* Set the number of I2C channel instance */
+	adap_info->ch_num = id->driver_data;
 
-	adap_info->pch_data.p_adapter_info = adap_info;
+	for (i = 0; i < adap_info->ch_num; i++) {
+		pch_adap = &adap_info->pch_data[i].pch_adapter;
+		adap_info->pch_i2c_suspended = false;
 
-	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;
+		adap_info->pch_data[i].p_adapter_info = adap_info;
 
-	/* (i * 0x80) + base_addr; */
-	adap_info->pch_data.pch_base_address = base_addr;
+		pch_adap->owner = THIS_MODULE;
+		pch_adap->class = I2C_CLASS_HWMON;
+		strcpy(pch_adap->name, KBUILD_MODNAME);
+		pch_adap->algo = &pch_algorithm;
+		pch_adap->algo_data = &adap_info->pch_data[i];
 
-	adap_info->pch_data.pch_adapter.dev.parent = &pdev->dev;
+		/* base_addr + offset; */
+		adap_info->pch_data[i].pch_base_address = base_addr + 0x100 * i;
 
-	ret = i2c_add_adapter(&(adap_info->pch_data.pch_adapter));
+		pch_adap->dev.parent = &pdev->dev;
 
-	if (ret) {
-		pch_pci_err(pdev, "i2c_add_adapter FAILED\n");
-		goto err_i2c_add_adapter;
-	}
+		ret = i2c_add_adapter(pch_adap);
+		if (ret) {
+			pch_pci_err(pdev, "i2c_add_adapter[ch:%d] FAILED\n", i);
+			goto err_i2c_add_adapter;
+		}
 
-	pch_i2c_init(&adap_info->pch_data);
+		pch_i2c_init(&adap_info->pch_data[i]);
+	}
 	ret = request_irq(pdev->irq, pch_i2c_handler, IRQF_SHARED,
-		  KBUILD_MODNAME, &adap_info->pch_data);
+		  KBUILD_MODNAME, adap_info);
 	if (ret) {
 		pch_pci_err(pdev, "request_irq FAILED\n");
 		goto err_request_irq;
@@ -779,7 +806,8 @@ static int __devinit pch_i2c_probe(struct pci_dev *pdev,
 	return 0;
 
 err_request_irq:
-	i2c_del_adapter(&(adap_info->pch_data.pch_adapter));
+	for (j = 0; j < i; j++)
+		i2c_del_adapter(&adap_info->pch_data[j].pch_adapter);
 err_i2c_add_adapter:
 	pci_iounmap(pdev, base_addr);
 err_pci_iomap:
@@ -793,17 +821,22 @@ err_pci_enable:
 
 static void __devexit pch_i2c_remove(struct pci_dev *pdev)
 {
+	int i;
 	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));
+	free_irq(pdev->irq, adap_info);
 
-	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;
+	for (i = 0; i < adap_info->ch_num; i++) {
+		pch_i2c_disbl_int(&adap_info->pch_data[i]);
+		i2c_del_adapter(&adap_info->pch_data[i].pch_adapter);
 	}
 
+	if (adap_info->pch_data[0].pch_base_address)
+		pci_iounmap(pdev, adap_info->pch_data[0].pch_base_address);
+
+	for (i = 0; i < adap_info->ch_num; i++)
+		adap_info->pch_data[i].pch_base_address = 0;
+
 	pci_set_drvdata(pdev, NULL);
 
 	pci_release_regions(pdev);
@@ -816,17 +849,22 @@ static void __devexit pch_i2c_remove(struct pci_dev *pdev)
 static int pch_i2c_suspend(struct pci_dev *pdev, pm_message_t state)
 {
 	int ret;
+	int i;
 	struct adapter_info *adap_info = pci_get_drvdata(pdev);
-	void __iomem *p = adap_info->pch_data.pch_base_address;
+	void __iomem *p = adap_info->pch_data[0].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);
+	for (i = 0; i < adap_info->ch_num; i++) {
+		while ((adap_info->pch_data[i].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);
+	for (i = 0; i < adap_info->ch_num; i++)
+		pch_i2c_disbl_int(&adap_info->pch_data[i]);
 
 	pch_pci_dbg(pdev, "I2CSR = %x I2CBUFSTA = %x I2CESRSTA = %x "
 		"invoked function pch_i2c_disbl_int successfully\n",
@@ -849,6 +887,7 @@ static int pch_i2c_suspend(struct pci_dev *pdev, pm_message_t state)
 
 static int pch_i2c_resume(struct pci_dev *pdev)
 {
+	int i;
 	struct adapter_info *adap_info = pci_get_drvdata(pdev);
 
 	pci_set_power_state(pdev, PCI_D0);
@@ -861,7 +900,8 @@ static int pch_i2c_resume(struct pci_dev *pdev)
 
 	pci_enable_wake(pdev, PCI_D3hot, 0);
 
-	pch_i2c_init(&adap_info->pch_data);
+	for (i = 0; i < adap_info->ch_num; i++)
+		pch_i2c_init(&adap_info->pch_data[i]);
 
 	adap_info->pch_i2c_suspended = false;
 
@@ -893,7 +933,7 @@ static void __exit pch_pci_exit(void)
 }
 module_exit(pch_pci_exit);
 
-MODULE_DESCRIPTION("PCH I2C PCI Driver");
+MODULE_DESCRIPTION("Intel EG20T PCH/OKI SEMICONDUCTOR ML7213 IOH I2C Driver");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Tomoya MORINAGA. <tomoya-linux@dsn.okisemi.com>");
 module_param(pch_i2c_speed, int, (S_IRUSR | S_IWUSR));
-- 
1.7.3.4