/*
* r8a7740 chip has lasting errata on I2C I/O pad reset.
* this is work-around for it.
*/
static int sh_mobile_i2c_r8a7740_workaround(struct sh_mobile_i2c_data *pd)
{
iic_set_clr(pd, ICCR, ICCR_ICE, 0);
iic_rd(pd, ICCR); /* dummy read */
iic_set_clr(pd, ICSTART, ICSTART_ICSTART, 0);
iic_rd(pd, ICSTART); /* dummy read */
udelay(10);
iic_wr(pd, ICCR, ICCR_SCP);
iic_wr(pd, ICSTART, 0);
udelay(10);
iic_wr(pd, ICCR, ICCR_TRS);
udelay(10);
iic_wr(pd, ICCR, 0);
udelay(10);
iic_wr(pd, ICCR, ICCR_TRS);
udelay(10);
return sh_mobile_i2c_init(pd);
}
static int sh_mobile_i2c_probe(struct platform_device *dev)
{
struct sh_mobile_i2c_data *pd;
struct i2c_adapter *adap;
struct resource *res;
const struct sh_mobile_dt_config *config;
int ret;
u32 bus_speed;
pd = devm_kzalloc(&dev->dev, sizeof(struct sh_mobile_i2c_data), GFP_KERNEL);
if (!pd)
return -ENOMEM;
pd->clk = devm_clk_get(&dev->dev, NULL);
if (IS_ERR(pd->clk)) {
dev_err(&dev->dev, "cannot get clock\n");
return PTR_ERR(pd->clk);
}
ret = sh_mobile_i2c_hook_irqs(dev, pd);
if (ret)
return ret;
pd->dev = &dev->dev;
platform_set_drvdata(dev, pd);
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
pd->res = res;
pd->reg = devm_ioremap_resource(&dev->dev, res);
if (IS_ERR(pd->reg))
return PTR_ERR(pd->reg);
ret = of_property_read_u32(dev->dev.of_node, "clock-frequency", &bus_speed);
pd->bus_speed = (ret || !bus_speed) ? STANDARD_MODE : bus_speed;
pd->clks_per_count = 1;
/* Newer variants come with two new bits in ICIC */
if (resource_size(res) > 0x17)
pd->flags |= IIC_FLAG_HAS_ICIC67;
pm_runtime_enable(&dev->dev);
pm_runtime_get_sync(&dev->dev);
config = of_device_get_match_data(&dev->dev);
if (config) {
pd->clks_per_count = config->clks_per_count;
ret = config->setup(pd);
} else {
ret = sh_mobile_i2c_init(pd);
}
pm_runtime_put_sync(&dev->dev);
if (ret)
return ret;
/* Init DMA */
sg_init_table(&pd->sg, 1);
pd->dma_direction = DMA_NONE;
pd->dma_rx = pd->dma_tx = ERR_PTR(-EPROBE_DEFER);
/* setup the private data */
adap = &pd->adap;
i2c_set_adapdata(adap, pd);
adap->owner = THIS_MODULE;
adap->algo = &sh_mobile_i2c_algorithm;
adap->quirks = &sh_mobile_i2c_quirks;
adap->dev.parent = &dev->dev;
adap->retries = 5;
adap->nr = dev->id;
adap->dev.of_node = dev->dev.of_node;
strlcpy(adap->name, dev->name, sizeof(adap->name));
spin_lock_init(&pd->lock);
init_waitqueue_head(&pd->wait);
ret = i2c_add_numbered_adapter(adap);
if (ret < 0) {
sh_mobile_i2c_release_dma(pd);
return ret;
}
dev_info(&dev->dev, "I2C adapter %d, bus speed %lu Hz\n", adap->nr, pd->bus_speed);
return 0;
}
static int sh_mobile_i2c_probe(struct platform_device *dev)
{
struct i2c_sh_mobile_platform_data *pdata = dev_get_platdata(&dev->dev);
struct sh_mobile_i2c_data *pd;
struct i2c_adapter *adap;
struct resource *res;
int ret;
u32 bus_speed;
pd = devm_kzalloc(&dev->dev, sizeof(struct sh_mobile_i2c_data), GFP_KERNEL);
if (!pd)
return -ENOMEM;
pd->clk = devm_clk_get(&dev->dev, NULL);
if (IS_ERR(pd->clk)) {
dev_err(&dev->dev, "cannot get clock\n");
return PTR_ERR(pd->clk);
}
ret = sh_mobile_i2c_hook_irqs(dev);
if (ret)
return ret;
pd->dev = &dev->dev;
platform_set_drvdata(dev, pd);
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
pd->reg = devm_ioremap_resource(&dev->dev, res);
if (IS_ERR(pd->reg))
return PTR_ERR(pd->reg);
/* Use platform data bus speed or STANDARD_MODE */
ret = of_property_read_u32(dev->dev.of_node, "clock-frequency", &bus_speed);
pd->bus_speed = ret ? STANDARD_MODE : bus_speed;
pd->clks_per_count = 1;
if (dev->dev.of_node) {
const struct of_device_id *match;
match = of_match_device(sh_mobile_i2c_dt_ids, &dev->dev);
if (match) {
const struct sh_mobile_dt_config *config;
config = match->data;
pd->clks_per_count = config->clks_per_count;
}
} else {
if (pdata && pdata->bus_speed)
pd->bus_speed = pdata->bus_speed;
if (pdata && pdata->clks_per_count)
pd->clks_per_count = pdata->clks_per_count;
}
/* The IIC blocks on SH-Mobile ARM processors
* come with two new bits in ICIC.
*/
if (resource_size(res) > 0x17)
pd->flags |= IIC_FLAG_HAS_ICIC67;
ret = sh_mobile_i2c_init(pd);
if (ret)
return ret;
/* Enable Runtime PM for this device.
*
* Also tell the Runtime PM core to ignore children
* for this device since it is valid for us to suspend
* this I2C master driver even though the slave devices
* on the I2C bus may not be suspended.
*
* The state of the I2C hardware bus is unaffected by
* the Runtime PM state.
*/
pm_suspend_ignore_children(&dev->dev, true);
pm_runtime_enable(&dev->dev);
/* setup the private data */
adap = &pd->adap;
i2c_set_adapdata(adap, pd);
adap->owner = THIS_MODULE;
adap->algo = &sh_mobile_i2c_algorithm;
adap->dev.parent = &dev->dev;
adap->retries = 5;
adap->nr = dev->id;
adap->dev.of_node = dev->dev.of_node;
strlcpy(adap->name, dev->name, sizeof(adap->name));
spin_lock_init(&pd->lock);
init_waitqueue_head(&pd->wait);
ret = i2c_add_numbered_adapter(adap);
if (ret < 0) {
dev_err(&dev->dev, "cannot add numbered adapter\n");
return ret;
}
dev_info(&dev->dev,
"I2C adapter %d with bus speed %lu Hz (L/H=0x%x/0x%x)\n",
adap->nr, pd->bus_speed, pd->iccl, pd->icch);
return 0;
}
