/**
* omap2_i2c_pullup - setup pull-up resistors for I2C bus
* @bus_id: bus id counting from number 1
* @sda_pullup: Pull-up resistor for SDA and SCL pins
*
*/
void omap2_i2c_pullup(int bus_id, enum omap_i2c_pullup_values pullup)
{
u32 val = 0;
if (bus_id < 1 || bus_id > omap_i2c_nr_ports() ||
pullup > I2C_PULLUP_STD_NA_FAST_300_OM) {
pr_err("%s:Wrong pullup (%d) or use wrong I2C port (%d)\n",
__func__, pullup, bus_id);
return;
}
val = omap4_ctrl_pad_readl(OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_I2C_0);
switch (bus_id) {
case 1:
/* Setup PULL-UP resistor for I2C-1 */
val &= ~(OMAP4_I2C1_SDA_LOAD_BITS_MASK |
OMAP4_I2C1_SCL_LOAD_BITS_MASK |
OMAP4_I2C1_SDA_PULLUPRESX_MASK |
OMAP4_I2C1_SCL_PULLUPRESX_MASK);
val |= ((pullup << OMAP4_I2C1_SDA_LOAD_BITS_SHIFT) |
(pullup << OMAP4_I2C1_SCL_LOAD_BITS_SHIFT));
break;
case 2:
/* Setup PULL-UP resistor for I2C-2 */
val &= ~(OMAP4_I2C2_SDA_LOAD_BITS_MASK |
OMAP4_I2C2_SCL_LOAD_BITS_MASK |
OMAP4_I2C2_SDA_PULLUPRESX_MASK |
OMAP4_I2C2_SCL_PULLUPRESX_MASK);
val |= ((pullup << OMAP4_I2C2_SDA_LOAD_BITS_SHIFT) |
(pullup << OMAP4_I2C2_SCL_LOAD_BITS_SHIFT));
break;
case 3:
/* Setup PULL-UP resistor for I2C-3 */
val &= ~(OMAP4_I2C3_SDA_LOAD_BITS_MASK |
OMAP4_I2C3_SCL_LOAD_BITS_MASK |
OMAP4_I2C3_SDA_PULLUPRESX_MASK |
OMAP4_I2C3_SCL_PULLUPRESX_MASK);
val |= ((pullup << OMAP4_I2C3_SDA_LOAD_BITS_SHIFT) |
(pullup << OMAP4_I2C3_SCL_LOAD_BITS_SHIFT));
break;
case 4:
/* Setup PULL-UP resistor for I2C-4 */
val &= ~(OMAP4_I2C4_SDA_LOAD_BITS_MASK |
OMAP4_I2C4_SCL_LOAD_BITS_MASK |
OMAP4_I2C4_SDA_PULLUPRESX_MASK |
OMAP4_I2C4_SCL_PULLUPRESX_MASK);
val |= ((pullup << OMAP4_I2C4_SDA_LOAD_BITS_SHIFT) |
(pullup << OMAP4_I2C4_SCL_LOAD_BITS_SHIFT));
break;
default:
return;
}
omap4_ctrl_pad_writel(val, OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_I2C_0);
}
/**
* omap_register_i2c_bus_board_data - register hwspinlock data
* @bus_id: bus id counting from number 1
* @pdata: pointer to the I2C bus board data
*/
void omap_register_i2c_bus_board_data(int bus_id,
struct omap_i2c_bus_board_data *pdata)
{
BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports());
if ((pdata != NULL) && (pdata->handle != NULL)) {
i2c_pdata[bus_id - 1].handle = pdata->handle;
i2c_pdata[bus_id - 1].hwspin_lock_timeout =
pdata->hwspin_lock_timeout;
i2c_pdata[bus_id - 1].hwspin_unlock = pdata->hwspin_unlock;
}
}
/**
* omap_i2c_bus_setup - Process command line options for the I2C bus speed
* @str: String of options
*
* This function allow to override the default I2C bus speed for given I2C
* bus with a command line option.
*
* Format: i2c_bus=bus_id,clkrate (in kHz)
*
* Returns 1 on success, 0 otherwise.
*/
static int __init omap_i2c_bus_setup(char *str)
{
int ports;
int ints[3];
ports = omap_i2c_nr_ports();
get_options(str, 3, ints);
if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports)
return 0;
i2c_pdata[ints[1] - 1].clkrate = ints[2];
i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP;
return 1;
}
/**
* omap_register_i2c_bus - register I2C bus with device descriptors
* @bus_id: bus id counting from number 1
* @clkrate: clock rate of the bus in kHz
* @info: pointer into I2C device descriptor table or NULL
* @len: number of descriptors in the table
*
* Returns 0 on success or an error code.
*/
int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
struct i2c_board_info const *info,
unsigned len)
{
int err;
BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports());
if (info) {
err = i2c_register_board_info(bus_id, info, len);
if (err)
return err;
}
if (!i2c_rate[bus_id - 1])
i2c_rate[bus_id - 1] = clkrate;
i2c_rate[bus_id - 1] &= ~OMAP_I2C_CMDLINE_SETUP;
return omap_i2c_add_bus(bus_id);
}
