errval_t ti_twl6030_set_vmmc_vsel(int millis)
{
TWL_DEBUG("ti_twl6030_vmmc_vsel\n");
//ti_twl6030_mmcctrl_vmmc_auto_off_wrf(&twl, 0x0);
ti_twl6030_mmcctrl_sw_fc_wrf(&twl, 0x1);
ti_twl6030_vmmc_off();
wait_msec(10);
ti_twl6030_vsel_t vsel = millis_to_vsel(millis);
ti_twl6030_vmmc_cfg_voltage_vsel_wrf(&twl, vsel);
ti_twl6030_vmmc_on();
//ti_twl6030_mmcctrl_vmmc_auto_off_wrf(&twl, 0x0);
ti_twl6030_vmmc_pr();
return SYS_ERR_OK;
}
/*
* \brief Prepare configuration of MMC host controller
*
*/
static void mmchs_pre_configure(void)
{
printf("mmchs: pre_configure()\n");
// need connection to TWL6030 for sdmmc1_enable_power()
ti_twl6030_init();
// for testing
ti_twl6030_vmmc_pr();
// TRM chapter 18: Control module? Is that CM2?
sdmmc1_enable_power();
// ==================================================
// STEP 2: Software reset
mmchs_do_sw_reset();
mmchs_do_state_machine_reset();
// ==================================================
// Step 1b: Disable idle and stanbdy states
mmchs_disable_standby();
mmchs_enable_wakeup();
}
/*
* We need to configure the extended-drain I/O pads to the right voltage and
* turn on the external power supply (TWL6030 on the pandaboard)
*/
void sdmmc1_enable_power(void)
{
// compare with Table 18-109 in OMAP TRM, p3681
// Step 1: software must keep PWRDNZ low when setting up voltages
printf("%s: Step 1\n", __FUNCTION__);
omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pbiaslite_pwrdnz_wrf(&ctrlmod, 0x0);
omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pwrdnz_wrf(&ctrlmod, 0x0);
// Step 2: preliminary settings for MMC1_PBIAS and MMC1 I/O cell
printf("%s: Step 2\n", __FUNCTION__);
// 1. turn of hiz mode
omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pbiaslite_hiz_mode_wrf(&ctrlmod, 0x0);
// 2. setup PBIAS_IRQ (MA_IRQ_75)
errval_t err = inthandler_setup_arm(pbias_handle_irq, NULL, PBIAS_IRQ);
assert(err_is_ok(err));
// 3. pad multiplexing -- looks ok when dumping pad registers, so I'm
// not doing anything right now -SG
// 4. set MMC1 speed control to 26MHz@30pF (0x0) -- alternative 65MHz@30pF (0x1)
omap44xx_sysctrl_padconf_core_control_mmc1_sdmmc1_dr0_speedctrl_wrf(&ctrlmod,
0x0);
omap44xx_sysctrl_padconf_core_control_mmc1_sdmmc1_dr1_speedctrl_wrf(&ctrlmod,
0x0);
omap44xx_sysctrl_padconf_core_control_mmc1_sdmmc1_dr2_speedctrl_wrf(&ctrlmod,
0x0);
// 5. set MMC1 pullup strength to 10-50kOhm (0x1) -- alt. 50-110kOhm (0x0)
omap44xx_sysctrl_padconf_core_control_mmc1_sdmmc1_pustrength_grp0_wrf(&ctrlmod,
0x0);
omap44xx_sysctrl_padconf_core_control_mmc1_sdmmc1_pustrength_grp1_wrf(&ctrlmod,
0x0);
omap44xx_sysctrl_padconf_core_control_mmc1_sdmmc1_pustrength_grp2_wrf(&ctrlmod,
0x0);
omap44xx_sysctrl_padconf_core_control_mmc1_sdmmc1_pustrength_grp3_wrf(&ctrlmod,
0x0);
// Step 3: Program desired SDMMC1_VDDS for MMC I/O in I2C attached power
// controller TODO? -- assuming 3.0V for now, manual says reset value is
// 3.0V -SG
// controller (3.0V)
//ti_twl6030_vmmc_off();
err = ti_twl6030_set_vmmc_vsel(3000);
assert(err_is_ok(err));
// Step 4: Set VMODE bit according to Step 3 (0x1 == 3.0V)
printf("%s: Step 4\n", __FUNCTION__);
omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pbiaslite_vmode_wrf(&ctrlmod, 0x1);
// Step 5: wait for SDMMC1_VDDS voltage to stabilize TODO
// might already be stable after reset? -SG
//ti_twl6030_vmmc_pr();
//mmchs_wait_msec(1000);
// Step 6: Disable PWRDNZ mode for MMC1_PBIAS and MMC1 I/O cell
printf("%s: Step 6\n", __FUNCTION__);
omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pbiaslite_pwrdnz_wrf(&ctrlmod, 0x1);
omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pwrdnz_wrf(&ctrlmod, 0x1);
//ti_twl6030_vmmc_on();
printf("%s:%d: wait until supply_hi_out is 0x1\n", __FUNCTION__, __LINE__);
while(omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pbiaslite_supply_hi_out_rdf(&ctrlmod)
!= 0x1) {}
printf("%s:%d: done waiting for suply hi out\n", __FUNCTION__, __LINE__);
// Step 7: Store SUPPLY_HI_OUT bit
uint8_t supply_hi_out =
omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pbiaslite_supply_hi_out_rdf(&ctrlmod);
printf("%s: Step 7: supply_hi_out = %d\n", __FUNCTION__, supply_hi_out);
printf("%s: Step 7: vmode_error = %d\n", __FUNCTION__,
omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pbiaslite_vmode_error_rdf(&ctrlmod));
// Wait for Interrupt
//printf("Waiting for pbias Interrupt (id=%d)\n", PBIAS_IRQ);
//while(!pbias_got_irq) {
// event_dispatch(get_default_waitset());
//}
printf("%s: Step 8\n", __FUNCTION__);
// Step 8: check VMODE_ERROR and set PWRDNZ if error
if (omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pbiaslite_vmode_error_rdf(&ctrlmod)) {
printf("got VMODE error\n");
omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pwrdnz_wrf(&ctrlmod, 0x0);
omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pbiaslite_pwrdnz_wrf(&ctrlmod, 0x0);
}
// Step 9: check if SUPPLY_HI_OUT corresponds to SDMMC1_VDDS (3.0V)
if (supply_hi_out != 0x1) {
printf("SDMMC1_VDDS seems to be != 3.0V\n");
// TODO: redo setting SDMMC1_VDDS
} else {
// supply_hi_out should be 0x1 (3.0V)
assert(supply_hi_out == 0x1);
// set VMODE bit to supply_hi_out
omap44xx_sysctrl_padconf_core_control_pbiaslite_mmc1_pbiaslite_vmode_wrf(&ctrlmod, supply_hi_out);
}
// Step 12: clear PBIAS IRQ
pbias_got_irq = 0;
char buf[2048];
omap44xx_sysctrl_padconf_core_control_pbiaslite_pr(buf, 2047, &ctrlmod);
printf("%s:%d: %s\n", __FUNCTION__, __LINE__, buf);
ti_twl6030_vmmc_pr();
}