LM
/
u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

nmhw21: don't power up GSM modem at startup 

BugzID: 57459
This commit is contained in:
Rene Straub 2019-06-12 12:59:11 +02:00
parent ccb5de587f
commit 5c5c0b98fe
1 changed files with 30 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
board/nm/nmhw21/board.c
View File

@ -704,41 +704,47 @@ static void init_gsm(void)
/* /*
* Perform power up sequence for TOBY-L2 modem. * Perform power up sequence for TOBY-L2 modem.
* *
* Modem is initially disabled and does not start automatically. * TOBY-L2 series can be switched on in one of the following ways:
* Enable power and start modem by "pressing" POWER_ON_OFF input for 1.0s. * - Rising edge on the VCC pin to a valid voltage for module supply,
* i.e. applying module supply
* - Low level on the PWR_ON pin, which is normally set high by an
* internal pull-up, for a valid time period when the applied VCC
* voltage is within the valid operating range (see section 4.2.8).
* - Low level on the RESET_N pin, which is normally set high by an
* internal pull-up, for a valid time period when the applied VCC
* voltage is within the valid operating range (see section 4.2.9).
*
* PWR_ON low time: 5 ms - Low time to switch-on the module
* RESET_N low time: 18..800 ms - Low time to switch-on the module
* 2.1..15 s - Low time to reset the module
* 16 s - Low time to switch-off the module
* *
* References: * References:
* - uBlox TOBY-L2 Datasheet UBX-13004573 - R24 * - uBlox TOBY-L2 Datasheet UBX-13004573 - R24
* 2.3.1 Module power-on * 2.3.1 Module power-on
* 4.2.8 PWR_ON pin
* 4.2.9 RESET_N pin
*
* Functionality:
* - Leave GSM power enable as is (default at power up = off)
* - Set reset line inactive (note: inverter logic in HW present)
* - Leave button unpressed (note: inverter logic in HW present)
* - Modem shall be enabled by Linux system by enabling GSM power
* supply
*/ */
bus = da9063_claim_i2c_bus();
puts("GSM: "); puts("GSM: ");
/* TODO: Keep Power-On and use GSM Modem Reset Signal to restart */ REQUEST_AND_CLEAR_GPIO(GPIO_RST_GSM); /* Set reset inactive (active high) */
REQUEST_AND_CLEAR_GPIO(GPIO_PWR_GSM); /* Set power switch inactive/released (active high) */
REQUEST_AND_SET_GPIO(GPIO_RST_GSM); /* Assert reset (active high) */ puts("init\n");
REQUEST_AND_CLEAR_GPIO(GPIO_PWR_GSM); /* Keep power switch inactive (released) */
da9063_set_gpio(PMIC_GSM_SUPPLY_EN_IO, 0); /* Switch GSM Supply off */
mdelay(30+100); /* Give time to discharge supply */
/* Keep of for 100ms, #3.3.2 */
da9063_set_gpio(PMIC_GSM_SUPPLY_EN_IO, 1); /* Enable GSM supply */
mdelay(10);
gpio_set_value(GPIO_RST_GSM, 0); /* Take modem out of reset */
puts("ready\n");
da9063_release_i2c_bus(bus);
} }
static void init_gnss(void) static void init_gnss(void)
{ {
/* /*
* Release GNSS reset line, so that modem starts up early * Release GNSS reset line, so that module starts up early
*/ */
REQUEST_AND_SET_GPIO(GPIO_RST_GNSS); REQUEST_AND_SET_GPIO(GPIO_RST_GNSS);
} }