/*
set pin configuration at run time
caller fills pin_configuration, except sel, which will derived from func in this routine.
*/
int pinmux_set_pin_config(struct pin_config *config)
{
int ret = 0, i;
void __iomem *base = g_chip_pin_desc.base;
enum PIN_NAME name;
if(!config)
return -EINVAL;
name = config->name;
if(!is_ball_valid(name))
return -EINVAL;
/* get the sel bits */
for (i=0; i<MAX_ALT_FUNC; i++) {
if (g_chip_pin_desc.desc_tbl[name].f_tbl[i] == config->func) {
config->reg.b.sel = i;
break;
}
}
if (i==MAX_ALT_FUNC) {
printk (KERN_WARNING "%s no matching function for pin %u\n", __func__, config->name);
return -EINVAL;
}
writel(config->reg.val, base + g_chip_pin_desc.desc_tbl[name].reg_offset);
/*
* When CONFIG_CAPRI_BSC3_PAD_CTRL_MODE is enabled, BSC3 pins are set
* to GPIO_67 and GPIO_68, if there is no I2C traffic on BSC3. This
* would pump lots of PINMUX change message to the console. So here
* use pr_debug instead of pr_info.
*/
#ifndef CONFIG_CAPRI_BSC3_PAD_CTRL_MODE
pr_info("[PINMUX] - write value 0x%08x to register 0x%08x\n",
config->reg.val,
g_chip_pin_desc.desc_tbl[name].reg_offset);
#else
pr_debug("[PINMUX] - write value 0x%08x to register 0x%08x\n",
config->reg.val,
g_chip_pin_desc.desc_tbl[name].reg_offset);
#endif
#ifdef CONFIG_PINMUX_VERIFY_WRITE
/* Add PINMUX_VERIFY_WRITE to the boards.cfg file board of interest to enable this code */
{
unsigned int rdval = readl(base + g_chip_pin_desc.desc_tbl[name].reg_offset);
if (rdval != config->reg.val)
{
printf(KERN_ERR "%s: pin %u offset 0x%x wrote 0x%x rdval 0x%x\n",
__func__, name, g_chip_pin_desc.desc_tbl[name].reg_offset,
config->reg.val, rdval);
return -EIO;
}
}
#endif
return ret;
}
/*
get pin configuration at run time
caller provides pin ball name
*/
int pinmux_get_pin_config(struct pin_config *config)
{
int ret = 0;
void __iomem *base = g_chip_pin_desc.base;
enum PIN_NAME name;
if(!config)
return -EINVAL;
name = config->name;
if(!is_ball_valid(name))
return -EINVAL;
config->reg.val = readl(base+g_chip_pin_desc.desc_tbl[name].reg_offset);
/* populate func */
config->func = g_chip_pin_desc.desc_tbl[name].f_tbl[config->reg.b.sel];
return ret;
}
static int bcm_modem_detect_gpio_request(enum PIN_NAME pin_cfg_name,
enum PIN_FUNC pin_cfg_func)
{
int rc = 0;
struct pin_config modem_det_pin_cfg;
struct pin_config modem_det_pin_cfg_orig;
unsigned int gpio_pin;
enum PIN_FUNC pin_func_orig;
if (is_ball_valid(pin_cfg_name)) {
rc = pinmux_find_gpio(pin_cfg_name, &gpio_pin, &pin_func_orig);
if (rc < 0) {
pr_err("%s: Unable to find gpio pin\n", __func__);
return rc;
}
modem_det_pin_cfg.name = pin_cfg_name;
rc = pinmux_get_pin_config(&modem_det_pin_cfg);
if (rc < 0) {
pr_err("%s: Unable to find pin configuration\n",
__func__);
return rc;
}
/* Keep a copy of original configuration */
memcpy(&modem_det_pin_cfg_orig, &modem_det_pin_cfg,
sizeof(struct pin_config));
modem_det_pin_cfg.reg.b.pull_up = 1;
modem_det_pin_cfg.reg.b.pull_dn = 0;
modem_det_pin_cfg.reg.b.drv_sth = DRIVE_STRENGTH_16MA;
modem_det_pin_cfg.func = pin_cfg_func;
rc = pinmux_set_pin_config(&modem_det_pin_cfg);
if (rc < 0) {
pr_err("%s: Unable to set pin configuration\n",
__func__);
return rc;
}
rc = gpio_request(gpio_pin, "modem_detect");
if (rc < 0) {
pr_err("Unable to request GPIO pin %d\n",
gpio_pin);
goto modem_detect_pin_config_restore;
}
/* Set to output to charge potentially existing capacitor */
gpio_direction_output(gpio_pin, 1);
mdelay(BCM_MODEM_DETECT_GPIO_CHARGE_MS);
gpio_direction_input(gpio_pin);
modem_present = gpio_get_value(gpio_pin);
modem_detect_pin_config_restore:
gpio_free(gpio_pin);
pinmux_set_pin_config(&modem_det_pin_cfg_orig);
} else {
rc = -EINVAL;
pr_err("%s: Invalid gpio pin name provided %d\n",
__func__, pin_cfg_name);
}
return rc;
}
