static inline void bus_reset_if_active(struct i2c_adapter *adap)
{
struct i2c_pnx_algo_data *alg_data = adap->algo_data;
u32 stat;
if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_active) {
dev_err(&adap->dev,
"%s: Bus is still active after xfer. Reset it...\n",
adap->name);
iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
I2C_REG_CTL(alg_data));
wait_reset(I2C_PNX_TIMEOUT, alg_data);
} else if (!(stat & mstatus_rfe) || !(stat & mstatus_tfe)) {
/* If there is data in the fifo's after transfer,
* flush fifo's by reset.
*/
iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
I2C_REG_CTL(alg_data));
wait_reset(I2C_PNX_TIMEOUT, alg_data);
} else if (stat & mstatus_nai) {
iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
I2C_REG_CTL(alg_data));
wait_reset(I2C_PNX_TIMEOUT, alg_data);
}
}
static inline void bus_reset_if_active(struct i2c_pnx_algo_data *alg_data)
{
u32 stat;
if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_active) {
dev_err(&alg_data->adapter.dev,
"%s: Bus is still active after xfer. Reset it...\n",
alg_data->adapter.name);
iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
I2C_REG_CTL(alg_data));
wait_reset(I2C_PNX_TIMEOUT, alg_data);
} else if (!(stat & mstatus_rfe) || !(stat & mstatus_tfe)) {
/*
*/
iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
I2C_REG_CTL(alg_data));
wait_reset(I2C_PNX_TIMEOUT, alg_data);
} else if (stat & mstatus_nai) {
iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
I2C_REG_CTL(alg_data));
wait_reset(I2C_PNX_TIMEOUT, alg_data);
}
}
int open_pclta( struct inode *inode, struct file *file )
{
struct pclta_device *device = pclta_device_table[MINOR(inode->i_rdev)];
file->private_data = device;
// file->f_op=&pclta_fops; karl test 13/07/2000
CALL_MSG("open_pclta()", ++pclta_call_level );
if( device == NULL ) {
RETURN_MSG("open_pclta() ENXIO", pclta_call_level-- );
return -ENXIO; // no such device
}
if( device->state != Offline ) {
RETURN_MSG("open_pclta() EBUSY", pclta_call_level-- );
return -EBUSY; // device busy
}
if( !open_device( device ) ) {
RETURN_MSG("open_pclta() ENOMEM", pclta_call_level-- );
return -ENOMEM; // out of memory
}
// program interrupt request line
// outb_p(irq_mask[device->interrupt], selirq_reg(device->base_address) ); //removed 07/07/200 karl. added init_hw below
DEBUG_MSG("Base Addy=0x0%x ; IRQ=%d ; IRQ MASK = 0x0%x \n",device->base_address, device->interrupt ,pclta_irq_mask[device->interrupt]);
init_hw( device->base_address, pclta_irq_mask[device->interrupt], device->txcvr_clock );
if( ! wait_reset(device->base_address, 500 ) ) {
VERBOSE_MSG( "error(%d) PCLTA_LRESET.\n", PCLTA_LRESET );
return -EBUSY;
} // waiting to leave reset state
device->state = Idle;
//enable_irq( device->interrupt ); // karl's test 07/07/2000
MOD_INC_USE_COUNT;
RETURN_MSG("open_pclta() OK", pclta_call_level-- );
return 0;
}
static void i2c_pnx_timeout(unsigned long data)
{
struct i2c_pnx_algo_data *alg_data = (struct i2c_pnx_algo_data *)data;
u32 ctl;
dev_err(&alg_data->adapter.dev,
"Master timed out. stat = %04x, cntrl = %04x. Resetting master...\n",
ioread32(I2C_REG_STS(alg_data)),
ioread32(I2C_REG_CTL(alg_data)));
/* Reset master and disable interrupts */
ctl = ioread32(I2C_REG_CTL(alg_data));
ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie | mcntrl_drmie);
iowrite32(ctl, I2C_REG_CTL(alg_data));
ctl |= mcntrl_reset;
iowrite32(ctl, I2C_REG_CTL(alg_data));
wait_reset(alg_data);
alg_data->mif.ret = -EIO;
complete(&alg_data->mif.complete);
}
static int i2c_pnx_probe(struct platform_device *pdev)
{
unsigned long tmp;
int ret = 0;
struct i2c_pnx_algo_data *alg_data;
unsigned long freq;
struct resource *res;
u32 speed = I2C_PNX_SPEED_KHZ_DEFAULT * 1000;
alg_data = devm_kzalloc(&pdev->dev, sizeof(*alg_data), GFP_KERNEL);
if (!alg_data)
return -ENOMEM;
platform_set_drvdata(pdev, alg_data);
alg_data->adapter.dev.parent = &pdev->dev;
alg_data->adapter.algo = &pnx_algorithm;
alg_data->adapter.algo_data = alg_data;
alg_data->adapter.nr = pdev->id;
alg_data->timeout = I2C_PNX_TIMEOUT_DEFAULT;
#ifdef CONFIG_OF
alg_data->adapter.dev.of_node = of_node_get(pdev->dev.of_node);
if (pdev->dev.of_node) {
of_property_read_u32(pdev->dev.of_node, "clock-frequency",
&speed);
/*
* At this point, it is planned to add an OF timeout property.
* As soon as there is a consensus about how to call and handle
* this, sth. like the following can be put here:
*
* of_property_read_u32(pdev->dev.of_node, "timeout",
* &alg_data->timeout);
*/
}
#endif
alg_data->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(alg_data->clk))
return PTR_ERR(alg_data->clk);
init_timer(&alg_data->mif.timer);
alg_data->mif.timer.function = i2c_pnx_timeout;
alg_data->mif.timer.data = (unsigned long)alg_data;
snprintf(alg_data->adapter.name, sizeof(alg_data->adapter.name),
"%s", pdev->name);
/* Register I/O resource */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
alg_data->ioaddr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(alg_data->ioaddr))
return PTR_ERR(alg_data->ioaddr);
ret = clk_prepare_enable(alg_data->clk);
if (ret)
return ret;
freq = clk_get_rate(alg_data->clk);
/*
* Clock Divisor High This value is the number of system clocks
* the serial clock (SCL) will be high.
* For example, if the system clock period is 50 ns and the maximum
* desired serial period is 10000 ns (100 kHz), then CLKHI would be
* set to 0.5*(f_sys/f_i2c)-2=0.5*(20e6/100e3)-2=98. The actual value
* programmed into CLKHI will vary from this slightly due to
* variations in the output pad's rise and fall times as well as
* the deglitching filter length.
*/
tmp = (freq / speed) / 2 - 2;
if (tmp > 0x3FF)
tmp = 0x3FF;
iowrite32(tmp, I2C_REG_CKH(alg_data));
iowrite32(tmp, I2C_REG_CKL(alg_data));
iowrite32(mcntrl_reset, I2C_REG_CTL(alg_data));
if (wait_reset(alg_data)) {
ret = -ENODEV;
goto out_clock;
}
init_completion(&alg_data->mif.complete);
alg_data->irq = platform_get_irq(pdev, 0);
if (alg_data->irq < 0) {
dev_err(&pdev->dev, "Failed to get IRQ from platform resource\n");
ret = alg_data->irq;
goto out_clock;
}
ret = devm_request_irq(&pdev->dev, alg_data->irq, i2c_pnx_interrupt,
0, pdev->name, alg_data);
if (ret)
goto out_clock;
/* Register this adapter with the I2C subsystem */
ret = i2c_add_numbered_adapter(&alg_data->adapter);
if (ret < 0) {
dev_err(&pdev->dev, "I2C: Failed to add bus\n");
goto out_clock;
}
dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n",
alg_data->adapter.name, res->start, alg_data->irq);
return 0;
out_clock:
clk_disable_unprepare(alg_data->clk);
return ret;
}
static int __devinit i2c_pnx_probe(struct platform_device *pdev)
{
unsigned long tmp;
int ret = 0;
struct i2c_pnx_algo_data *alg_data;
int freq_mhz;
struct i2c_pnx_data *i2c_pnx = pdev->dev.platform_data;
if (!i2c_pnx || !i2c_pnx->adapter) {
dev_err(&pdev->dev, "%s: no platform data supplied\n",
__func__);
ret = -EINVAL;
goto out;
}
platform_set_drvdata(pdev, i2c_pnx);
if (i2c_pnx->calculate_input_freq)
freq_mhz = i2c_pnx->calculate_input_freq(pdev);
else {
freq_mhz = PNX_DEFAULT_FREQ;
dev_info(&pdev->dev, "Setting bus frequency to default value: "
"%d MHz\n", freq_mhz);
}
i2c_pnx->adapter->algo = &pnx_algorithm;
alg_data = i2c_pnx->adapter->algo_data;
init_timer(&alg_data->mif.timer);
alg_data->mif.timer.function = i2c_pnx_timeout;
alg_data->mif.timer.data = (unsigned long)i2c_pnx->adapter;
/* Register I/O resource */
if (!request_mem_region(alg_data->base, I2C_PNX_REGION_SIZE,
pdev->name)) {
dev_err(&pdev->dev,
"I/O region 0x%08x for I2C already in use.\n",
alg_data->base);
ret = -ENODEV;
goto out_drvdata;
}
if (!(alg_data->ioaddr =
(u32)ioremap(alg_data->base, I2C_PNX_REGION_SIZE))) {
dev_err(&pdev->dev, "Couldn't ioremap I2C I/O region\n");
ret = -ENOMEM;
goto out_release;
}
i2c_pnx->set_clock_run(pdev);
/*
* Clock Divisor High This value is the number of system clocks
* the serial clock (SCL) will be high.
* For example, if the system clock period is 50 ns and the maximum
* desired serial period is 10000 ns (100 kHz), then CLKHI would be
* set to 0.5*(f_sys/f_i2c)-2=0.5*(20e6/100e3)-2=98. The actual value
* programmed into CLKHI will vary from this slightly due to
* variations in the output pad's rise and fall times as well as
* the deglitching filter length.
*/
tmp = ((freq_mhz * 1000) / I2C_PNX_SPEED_KHZ) / 2 - 2;
iowrite32(tmp, I2C_REG_CKH(alg_data));
iowrite32(tmp, I2C_REG_CKL(alg_data));
iowrite32(mcntrl_reset, I2C_REG_CTL(alg_data));
if (wait_reset(I2C_PNX_TIMEOUT, alg_data)) {
ret = -ENODEV;
goto out_unmap;
}
init_completion(&alg_data->mif.complete);
ret = request_irq(alg_data->irq, i2c_pnx_interrupt,
0, pdev->name, i2c_pnx->adapter);
if (ret)
goto out_clock;
/* Register this adapter with the I2C subsystem */
i2c_pnx->adapter->dev.parent = &pdev->dev;
ret = i2c_add_adapter(i2c_pnx->adapter);
if (ret < 0) {
dev_err(&pdev->dev, "I2C: Failed to add bus\n");
goto out_irq;
}
dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n",
i2c_pnx->adapter->name, alg_data->base, alg_data->irq);
return 0;
out_irq:
free_irq(alg_data->irq, alg_data);
out_clock:
i2c_pnx->set_clock_stop(pdev);
out_unmap:
iounmap((void *)alg_data->ioaddr);
out_release:
release_mem_region(alg_data->base, I2C_PNX_REGION_SIZE);
out_drvdata:
platform_set_drvdata(pdev, NULL);
out:
return ret;
}
static int __devinit i2c_pnx_probe(struct platform_device *pdev)
{
unsigned long tmp;
int ret = 0;
struct i2c_pnx_algo_data *alg_data;
unsigned long freq;
struct i2c_pnx_data *i2c_pnx = pdev->dev.platform_data;
if (!i2c_pnx || !i2c_pnx->name) {
dev_err(&pdev->dev, "%s: no platform data supplied\n",
__func__);
ret = -EINVAL;
goto out;
}
alg_data = kzalloc(sizeof(*alg_data), GFP_KERNEL);
if (!alg_data) {
ret = -ENOMEM;
goto err_kzalloc;
}
platform_set_drvdata(pdev, alg_data);
strlcpy(alg_data->adapter.name, i2c_pnx->name,
sizeof(alg_data->adapter.name));
alg_data->adapter.dev.parent = &pdev->dev;
alg_data->adapter.algo = &pnx_algorithm;
alg_data->adapter.algo_data = alg_data;
alg_data->adapter.nr = pdev->id;
alg_data->i2c_pnx = i2c_pnx;
alg_data->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(alg_data->clk)) {
ret = PTR_ERR(alg_data->clk);
goto out_drvdata;
}
init_timer(&alg_data->mif.timer);
alg_data->mif.timer.function = i2c_pnx_timeout;
alg_data->mif.timer.data = (unsigned long)alg_data;
/* Register I/O resource */
if (!request_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE,
pdev->name)) {
dev_err(&pdev->dev,
"I/O region 0x%08x for I2C already in use.\n",
i2c_pnx->base);
ret = -ENODEV;
goto out_clkget;
}
alg_data->ioaddr = ioremap(i2c_pnx->base, I2C_PNX_REGION_SIZE);
if (!alg_data->ioaddr) {
dev_err(&pdev->dev, "Couldn't ioremap I2C I/O region\n");
ret = -ENOMEM;
goto out_release;
}
ret = clk_enable(alg_data->clk);
if (ret)
goto out_unmap;
freq = clk_get_rate(alg_data->clk);
/*
* Clock Divisor High This value is the number of system clocks
* the serial clock (SCL) will be high.
* For example, if the system clock period is 50 ns and the maximum
* desired serial period is 10000 ns (100 kHz), then CLKHI would be
* set to 0.5*(f_sys/f_i2c)-2=0.5*(20e6/100e3)-2=98. The actual value
* programmed into CLKHI will vary from this slightly due to
* variations in the output pad's rise and fall times as well as
* the deglitching filter length.
*/
tmp = ((freq / 1000) / I2C_PNX_SPEED_KHZ) / 2 - 2;
iowrite32(tmp, I2C_REG_CKH(alg_data));
iowrite32(tmp, I2C_REG_CKL(alg_data));
iowrite32(mcntrl_reset, I2C_REG_CTL(alg_data));
if (wait_reset(I2C_PNX_TIMEOUT, alg_data)) {
ret = -ENODEV;
goto out_clock;
}
init_completion(&alg_data->mif.complete);
ret = request_irq(i2c_pnx->irq, i2c_pnx_interrupt,
0, pdev->name, alg_data);
if (ret)
goto out_clock;
/* Register this adapter with the I2C subsystem */
ret = i2c_add_numbered_adapter(&alg_data->adapter);
if (ret < 0) {
dev_err(&pdev->dev, "I2C: Failed to add bus\n");
goto out_irq;
}
dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n",
alg_data->adapter.name, i2c_pnx->base, i2c_pnx->irq);
return 0;
out_irq:
free_irq(i2c_pnx->irq, alg_data);
out_clock:
clk_disable(alg_data->clk);
out_unmap:
iounmap(alg_data->ioaddr);
out_release:
release_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE);
out_clkget:
clk_put(alg_data->clk);
out_drvdata:
kfree(alg_data);
err_kzalloc:
platform_set_drvdata(pdev, NULL);
out:
return ret;
}
static int __devinit i2c_pnx_probe(struct platform_device *pdev)
{
unsigned long tmp;
int ret = 0;
struct i2c_pnx_algo_data *alg_data;
unsigned long freq;
struct i2c_pnx_data *i2c_pnx = pdev->dev.platform_data;
if (!i2c_pnx || !i2c_pnx->name) {
dev_err(&pdev->dev, "%s: no platform data supplied\n",
__func__);
ret = -EINVAL;
goto out;
}
alg_data = kzalloc(sizeof(*alg_data), GFP_KERNEL);
if (!alg_data) {
ret = -ENOMEM;
goto err_kzalloc;
}
platform_set_drvdata(pdev, alg_data);
strlcpy(alg_data->adapter.name, i2c_pnx->name,
sizeof(alg_data->adapter.name));
alg_data->adapter.dev.parent = &pdev->dev;
alg_data->adapter.algo = &pnx_algorithm;
alg_data->adapter.algo_data = alg_data;
alg_data->adapter.nr = pdev->id;
alg_data->i2c_pnx = i2c_pnx;
alg_data->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(alg_data->clk)) {
ret = PTR_ERR(alg_data->clk);
goto out_drvdata;
}
init_timer(&alg_data->mif.timer);
alg_data->mif.timer.function = i2c_pnx_timeout;
alg_data->mif.timer.data = (unsigned long)alg_data;
/* */
if (!request_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE,
pdev->name)) {
dev_err(&pdev->dev,
"I/O region 0x%08x for I2C already in use.\n",
i2c_pnx->base);
ret = -ENODEV;
goto out_clkget;
}
alg_data->ioaddr = ioremap(i2c_pnx->base, I2C_PNX_REGION_SIZE);
if (!alg_data->ioaddr) {
dev_err(&pdev->dev, "Couldn't ioremap I2C I/O region\n");
ret = -ENOMEM;
goto out_release;
}
ret = clk_enable(alg_data->clk);
if (ret)
goto out_unmap;
freq = clk_get_rate(alg_data->clk);
/*
*/
tmp = ((freq / 1000) / I2C_PNX_SPEED_KHZ) / 2 - 2;
if (tmp > 0x3FF)
tmp = 0x3FF;
iowrite32(tmp, I2C_REG_CKH(alg_data));
iowrite32(tmp, I2C_REG_CKL(alg_data));
iowrite32(mcntrl_reset, I2C_REG_CTL(alg_data));
if (wait_reset(I2C_PNX_TIMEOUT, alg_data)) {
ret = -ENODEV;
goto out_clock;
}
init_completion(&alg_data->mif.complete);
ret = request_irq(i2c_pnx->irq, i2c_pnx_interrupt,
0, pdev->name, alg_data);
if (ret)
goto out_clock;
/* */
ret = i2c_add_numbered_adapter(&alg_data->adapter);
if (ret < 0) {
dev_err(&pdev->dev, "I2C: Failed to add bus\n");
goto out_irq;
}
dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n",
alg_data->adapter.name, i2c_pnx->base, i2c_pnx->irq);
return 0;
out_irq:
free_irq(i2c_pnx->irq, alg_data);
out_clock:
clk_disable(alg_data->clk);
out_unmap:
iounmap(alg_data->ioaddr);
out_release:
release_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE);
out_clkget:
clk_put(alg_data->clk);
out_drvdata:
kfree(alg_data);
err_kzalloc:
platform_set_drvdata(pdev, NULL);
out:
return ret;
}
bool probe_hardware( int minor )
{
int erc, trans;
byte rx_buffer[256];
int port = base_address[minor];
int irq = pclta_interrupt[minor];
struct pclta_device * device;
if( !port || !irq )
return 0;
VERBOSE_MSG( "probing minor = %d, I/O = %#x-%#x, interrupt request = %d ... ",
minor, port, port+3, irq );
if( 0 > check_region( port, 4 ) ) {
VERBOSE_MSG( "error(%d) PCLTA_IOPERM.\n", PCLTA_IOPERM );
return false;
}
init_hw( port, 0x00, CLK_10 ); // initialize device hardware, no IRQ
if( ! wait_reset( port, 500 ) ) {
VERBOSE_MSG( "error(%d) PCLTA_LRESET.\n", PCLTA_LRESET );
return false;
} // waiting to leave reset state
setup_timeout( 200 );
while( !pclta_timeout );
// Why wait? Because, when PCLTA gets out of RESET state, it sets
// status register BEFORE preparing uplink reset. So, I read the
// packet of length 0 and get an error. Stupid!
// wait for reset command response
if( ! wait_uplink_buffer( port, 500, rx_buffer ) ) {
VERBOSE_MSG( "error(%d) PCLTA_RESP. \n", PCLTA_RESP );
return false;
}
// make sure the reset was successful
if( rx_buffer[0] != 1 || rx_buffer[1] != niRESET ) {
VERBOSE_MSG( "error(%d) PCLTA_RESP. Reset not successfull. \n", PCLTA_RESP );
return false;
}
// set up internal interrupt register
write_byte_wait( port, CMD_XFER );
write_byte_wait( port, 2 );
write_byte_wait( port, niIRQENA );
write_byte_wait( port, IRQPLRTY | RESET_ENABLE | DLREADY_ENABLE | DLPBA_ENABLE
| DLBA_ENABLE | ULREADY_ENABLE );
// write a command to get transciever status
write_byte_wait( port, CMD_XFER );
write_byte_wait( port, 1 );
write_byte_wait( port, niSSTATUS );
// wait for response
if( ! wait_uplink_buffer( port, 500, rx_buffer ) ) {
VERBOSE_MSG( "error(%d) PCLTA_STAT.\n", PCLTA_STAT );
return false;
}
// get transceiver type
trans = rx_buffer[2]>>3;
if( ! *pclta_transceiver[trans] ) {
VERBOSE_MSG( "error(%d) PCLTA_TSCV.\n", PCLTA_TSCV );
return false; // transciever not supported
}
// register character device
if( 0 > (pclta_major = register_chrdev( 0, "pclta", &pclta_fops )) ) {
VERBOSE_MSG( "error(%d) PCLTA_MAJOR.\n", PCLTA_MAJOR );
return false;
}
// request interrupt permission OLD LOCATION
// if( 0 > ( erc = request_irq( irq, pclta_interrupt, 0, "pclta", NULL ) ) ) { SLOW INT
// if( 0 > ( erc = request_irq( irq, pclta_interrupt,SA_INTERRUPT, "pclta", device ) ) ) {
// VERBOSE_MSG( "error(%d) PCLTA_IRQPERM.\n", PCLTA_IRQPERM );
// return false;
// }
// create device descriptor
device = create_device( port, irq, pclta_clock[rx_buffer[2]>>3] );
if( device == NULL ) {
VERBOSE_MSG( "error(%d) PCLTA_CDEV.\n", PCLTA_CDEV );
return false;
}
// request interrupt permission NEW LOCATION SO WE HAVE DEVICE STRUCT
// if( 0 > ( erc = request_irq( irq, pclta_interrupt, 0, "pclta", NULL ) ) ) { SLOW INT
if( 0 > ( erc = request_irq( irq, pclta_interrupt_handler,0, "pclta", device) ) ) {
VERBOSE_MSG( "error(%d) PCLTA_IRQPERM.\n", PCLTA_IRQPERM );
return false;
}
// set up pointers to device descriptor
pclta_device_table[minor] = device;
pclta_interrupt_table[minor] = device;
// remember minor number
device->minor = minor;
// claim I/O space
request_region( port, 4, "pclta" );
// start up the interupts removed 07/07 by karl.
// init_hw( port,irq_mask[irq], CLK_10 ); // initialize device hardware, no IRQ
DEBUG_MSG( "Transceiver type: %s", pclta_transceiver[trans] );
MESSAGE("Device pclta%d installed.", minor );
return true;
}