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i2c-eg20t: support new device OKI SEMICONDUCTOR ML7213 IOH
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Support new device OKI SEMICONDUCTOR ML7213 IOH.
The ML7213 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>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
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Tomoya MORINAGA authored and Ben Dooks committed Mar 2, 2011
1 parent 493f335 commit 173442f
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Showing 2 changed files with 108 additions and 68 deletions.
15 changes: 9 additions & 6 deletions drivers/i2c/busses/Kconfig
View file
Original file line number Diff line number Diff line change
Expand Up @@ -639,12 +639,15 @@ config I2C_XILINX
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.
tristate "Intel EG20T PCH/OKI SEMICONDUCTOR ML7213 IOH"
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.

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"

Expand Down
161 changes: 99 additions & 62 deletions drivers/i2c/busses/i2c-eg20t.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand All @@ -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;
};


Expand All @@ -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,}
};

Expand Down Expand Up @@ -211,8 +225,7 @@ static void pch_i2c_init(struct i2c_algo_pch_data *adap)
/* Initialize I2C registers */
iowrite32(0x21, p + PCH_I2CNF);

pch_setbit(adap->pch_base_address, PCH_I2CCTL,
PCH_I2CCTL_I2CMEN);
pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_I2CCTL_I2CMEN);

if (pch_i2c_speed != 400)
pch_i2c_speed = 100;
Expand Down Expand Up @@ -254,7 +267,7 @@ static inline bool ktime_lt(const ktime_t cmp1, const ktime_t cmp2)
* @timeout: waiting time counter (us).
*/
static s32 pch_i2c_wait_for_bus_idle(struct i2c_algo_pch_data *adap,
s32 timeout)
s32 timeout)
{
void __iomem *p = adap->pch_base_address;

Expand Down Expand Up @@ -474,8 +487,8 @@ static void pch_i2c_sendnack(struct i2c_algo_pch_data *adap)
* @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)
static 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;

Expand Down Expand Up @@ -568,10 +581,10 @@ 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;
Expand Down Expand Up @@ -599,24 +612,30 @@ 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);

if (mode != NORMAL_MODE) {
pch_err(adap_data, "I2C mode is not supported\n");
return IRQ_NONE;
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;
}
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;
}

/**
Expand All @@ -626,7 +645,7 @@ static irqreturn_t pch_i2c_handler(int irq, void *pData)
* @num: number of messages.
*/
static s32 pch_i2c_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg *msgs, s32 num)
struct i2c_msg *msgs, s32 num)
{
struct i2c_msg *pmsg;
u32 i = 0;
Expand Down Expand Up @@ -709,11 +728,13 @@ static void pch_i2c_disbl_int(struct i2c_algo_pch_data *adap)
}

static int __devinit pch_i2c_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
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");

Expand Down Expand Up @@ -743,44 +764,48 @@ 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;
goto err_i2c_add_adapter;
}

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:
for (j = 0; j < i; j++)
i2c_del_adapter(&adap_info->pch_data[j].pch_adapter);
pci_iounmap(pdev, base_addr);
err_pci_iomap:
pci_release_regions(pdev);
Expand All @@ -793,17 +818,22 @@ static int __devinit pch_i2c_probe(struct pci_dev *pdev,

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);
Expand All @@ -816,17 +846,22 @@ 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",
Expand All @@ -849,6 +884,7 @@ 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);
Expand All @@ -861,7 +897,8 @@ 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;

Expand Down Expand Up @@ -893,7 +930,7 @@ 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));
Expand Down

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