Hi Lesly, Lesly A M <lesl...@ti.com> writes:
> Workaround for TWL5030 Silicon Errata 27 & 28: > 27 - VDD1, VDD2, may have glitches when their output value is updated. > 28 - VDD1 and / or VDD2 DCDC clock may stop working when internal clock > is switched from internal to external. > > Errata 27: > If the DCDC regulators is running on their internal oscillator, > negative glitches may occur on VDD1, VDD2 output when voltage is > changed. > The OMAP device may reboot if the VDD1 or VDD2 go below the > core minimum operating voltage. > > WORKAROUND > Set up the TWL5030 DC-DC power supplies to use the HFCLKIN instead of > the internal oscillator. > > Errata 28: > VDD1/VDD2 clock system may hang during switching the clock source from > internal oscillator to external. VDD1/VDD2 output voltages may collapse > if clock stops. > > WORKAROUND > If HFCLK is disabled in OFFMODE, modify the sleep/wakeup sequence and > setuptimes to make sure the switching will happen only when HFCLKIN is > stable. > Also use the TWL5030 watchdog to safeguard the first switching from > internal oscillator to HFCLKIN during the TWL5030 init. > > IMPACT > power sequence is changed. > sleep/wakeup time values will be changed. > > The workaround changes are called from twl4030_power_init(), since we have to > make some i2c_read calls to check the TRITON version & the i2c will not be > initialized in the early stage. > > This workaround is required for TWL5030 Silicon version less than ES1.2 > The power script & setup time changes are recommended by TI HW team. > > http://omapedia.org/wiki/TWL4030_power_scripts > > Changes taken from TRITON Errata27 workaround patch by Nishanth Menon. > > Signed-off-by: Lesly A M <lesl...@ti.com> > Cc: Nishanth Menon <n...@ti.com> > Cc: David Derrick <dderr...@ti.com> > Cc: Samuel Ortiz <sa...@linux.intel.com> Some minor comments below, > --- > arch/arm/mach-omap2/twl4030.c | 114 > +++++++++++++++++++++++++++++++++++++++++ > drivers/mfd/twl4030-power.c | 64 +++++++++++++++++++++++ > include/linux/i2c/twl.h | 1 + > 3 files changed, 179 insertions(+), 0 deletions(-) > > diff --git a/arch/arm/mach-omap2/twl4030.c b/arch/arm/mach-omap2/twl4030.c > index ff344b3..87de049 100644 > --- a/arch/arm/mach-omap2/twl4030.c > +++ b/arch/arm/mach-omap2/twl4030.c > @@ -137,9 +137,123 @@ static struct twl4030_resconfig twl4030_rconfig[] = { > { 0, 0}, > }; > > +/* > + * Active to Sleep sequence, which is executed upon P1/P2/P3 > + * transition for sleep. > + * > + * The sleep sequence is adjusted to do the switching of VDD1/VDD2/VIO OSC > from > + * HFCLKIN to internal oscillator when the HFCLKIN is stable. > + */ > +static struct twl4030_ins __initdata sleep_on_seq_errata27[] = { > + /* > + * Singular message to disable HCLKOUT. > + * Wait for ~488.32 uS to do the switching of VDD1/VDD2/VIO OSC from > + * HFCLKIN to internal oscillator before disabling HFCLKIN. > + */ > + {MSG_SINGULAR(DEV_GRP_NULL, RES_HFCLKOUT, RES_STATE_SLEEP), 20}, > + /* Broadcast message to put res(TYPE2 = 1) to sleep */ > + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R1, > + RES_STATE_SLEEP), 2}, > + /* Broadcast message to put res(TYPE2 = 2) to sleep, disable HFCLKIN */ > + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R2, > + RES_STATE_SLEEP), 2}, > +}; > + > +static struct twl4030_script sleep_on_script_errata27 __initdata = { > + .script = sleep_on_seq_errata27, > + .size = ARRAY_SIZE(sleep_on_seq_errata27), > + .flags = TWL4030_SLEEP_SCRIPT, > +}; > + > +/* > + * Sleep to Active sequence, which is executed upon P1/P2/P3 > + * transition for wakeup. > + * > + * The wakeup sequence is adjusted to do the VDD1/VDD2 voltage rampup > + * only after HFCLKIN is stabilized and the HFCLKOUT is enabled. > + */ > +static struct twl4030_ins wakeup_seq_errata27[] __initdata = { > + /* > + * Broadcast message to put res(TYPE2 = 2) to active. > + * Wait for ~10 mS (rampup time for OSC on the board) > + * after HFCLKIN is enabled > + */ > + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R2, > + RES_STATE_ACTIVE), 55}, > + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R2, > + RES_STATE_ACTIVE), 55}, > + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R2, > + RES_STATE_ACTIVE), 54}, > + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R2, > + RES_STATE_ACTIVE), 1}, > + /* Singular message to enable HCLKOUT after HFCLKIN is stabilized */ > + {MSG_SINGULAR(DEV_GRP_NULL, RES_HFCLKOUT, RES_STATE_ACTIVE), 1}, > + /* > + * Broadcast message to put res(TYPE2 = 1) to active. > + * VDD1/VDD2 rampup after HFCLKIN is stable and HFCLKOUT is enabled. > + */ > + {MSG_BROADCAST(DEV_GRP_NULL, RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R1, > + RES_STATE_ACTIVE), 2}, > +}; > + > +static struct twl4030_script wakeup_script_errata27 __initdata = { > + .script = wakeup_seq_errata27, > + .size = ARRAY_SIZE(wakeup_seq_errata27), > + .flags = TWL4030_WAKEUP12_SCRIPT | TWL4030_WAKEUP3_SCRIPT, > +}; > + > +/* TRITON script for sleep, wakeup & warm_reset */ > +static struct twl4030_script *twl4030_scripts_errata27[] __initdata = { > + &sleep_on_script_errata27, > + &wakeup_script_errata27, > + &wrst_script, > +}; > + > +/* > + * VDD1/VDD2/VPLL are assigned to P1 and P3, to have better control > + * during OFFMODE. HFCLKOUT is assigned to P1 and P3 (*p2) to turn off > + * only during OFFMODE. > + * (*P2 is included if the platform uses it for modem/some other processor) > + */ > +static struct twl4030_resconfig twl4030_rconfig_errata27[] = { > + { .resource = RES_VPLL1, .devgroup = DEV_GRP_P1 | DEV_GRP_P3, > + .type = 3, .type2 = 1, .remap_sleep = RES_STATE_OFF }, > + { .resource = RES_VINTANA1, .devgroup = DEV_GRP_ALL, .type = 1, > + .type2 = 2, .remap_sleep = RES_STATE_SLEEP }, > + { .resource = RES_VINTANA2, .devgroup = DEV_GRP_ALL, .type = 0, > + .type2 = 2, .remap_sleep = RES_STATE_SLEEP }, > + { .resource = RES_VINTDIG, .devgroup = DEV_GRP_ALL, .type = 1, > + .type2 = 2, .remap_sleep = RES_STATE_SLEEP }, > + { .resource = RES_VIO, .devgroup = DEV_GRP_ALL, .type = 2, > + .type2 = 2, .remap_sleep = RES_STATE_SLEEP }, > + { .resource = RES_VDD1, .devgroup = DEV_GRP_P1 | DEV_GRP_P3, > + .type = 4, .type2 = 1, .remap_sleep = RES_STATE_OFF }, > + { .resource = RES_VDD2, .devgroup = DEV_GRP_P1 | DEV_GRP_P3, > + .type = 3, .type2 = 1, .remap_sleep = RES_STATE_OFF }, > + { .resource = RES_REGEN, .devgroup = DEV_GRP_ALL, .type = 2, > + .type2 = 1, .remap_sleep = RES_STATE_SLEEP }, > + { .resource = RES_NRES_PWRON, .devgroup = DEV_GRP_ALL, .type = 0, > + .type2 = 1, .remap_sleep = RES_STATE_SLEEP }, > + { .resource = RES_CLKEN, .devgroup = DEV_GRP_ALL, .type = 3, > + .type2 = 2, .remap_sleep = RES_STATE_SLEEP }, > + { .resource = RES_SYSEN, .devgroup = DEV_GRP_ALL, .type = 6, > + .type2 = 1, .remap_sleep = RES_STATE_SLEEP }, > + { .resource = RES_HFCLKOUT, .devgroup = DEV_GRP_P1 | DEV_GRP_P3, > + .type = 0, .type2 = 1, .remap_sleep = RES_STATE_SLEEP }, > + { 0, 0}, > +}; > + > +void twl5030_script_errata27(void) static > +{ > + twl4030_generic_script.scripts = twl4030_scripts_errata27; > + twl4030_generic_script.num = ARRAY_SIZE(twl4030_scripts_errata27); > + twl4030_generic_script.resource_config = twl4030_rconfig_errata27; > +} > + > struct twl4030_power_data __initdata twl4030_generic_script = { > .scripts = twl4030_scripts, > .num = ARRAY_SIZE(twl4030_scripts), > .resource_config = twl4030_rconfig, > + .twl5030_errata27wa_script = twl5030_script_errata27, > }; > #endif > diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c > index 8373d79..db24d09 100644 > --- a/drivers/mfd/twl4030-power.c > +++ b/drivers/mfd/twl4030-power.c > @@ -63,6 +63,14 @@ static u8 twl4030_start_script_address = 0x2b; > #define R_MEMORY_ADDRESS PHY_TO_OFF_PM_MASTER(0x59) > #define R_MEMORY_DATA PHY_TO_OFF_PM_MASTER(0x5a) > > +#define R_VDD1_OSC 0x5C > +#define R_VDD2_OSC 0x6A > +#define R_VIO_OSC 0x52 > +#define EXT_FS_CLK_EN (0x1 << 6) > + BIT(6) > +#define R_WDT_CFG 0x03 > +#define WDT_WRK_TIMEOUT 0x03 > + > /* resource configuration registers > <RESOURCE>_DEV_GRP at address 'n+0' > <RESOURCE>_TYPE at address 'n+1' > @@ -511,6 +519,53 @@ int twl4030_remove_script(u8 flags) > return err; > } > > +/** > + * twl_errata27_workaround() - Workaround for TWL5030 Silicon Errata 27 & 28: > + * 27 - VDD1, VDD2, may have glitches when their output value is updated. > + * 28 - VDD1 and / or VDD2 DCDC clock may stop working when internal clock is > + * switched from internal to external. > + * > + * Workaround requires the TWL DCDCs to use HFCLK instead of > + * internal oscillator. Also enable TWL watchdog before switching the osc > + * to recover if the VDD1/VDD2 stop working. > + */ > +static void __init twl_errata27_workaround(void) > +{ > + u8 val; > + u8 smps_osc_reg[] = {R_VDD1_OSC, R_VDD2_OSC, R_VIO_OSC}; > + u8 wdt_counter_val = 0; > + int i; > + int err; > + > + /* Setup the twl wdt to take care of borderline failure case */ > + err = twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &wdt_counter_val, > + R_WDT_CFG); > + err |= twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, WDT_WRK_TIMEOUT, > + R_WDT_CFG); > + > + for (i = 0; i < sizeof(smps_osc_reg); i++) { > + err |= twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &val, > + smps_osc_reg[i]); > + val |= EXT_FS_CLK_EN; > + err |= twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, val, > + smps_osc_reg[i]); > + } > + > + /* restore the original value */ > + err |= twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, wdt_counter_val, > + R_WDT_CFG); > + if (err) > + pr_warning("TWL4030: workaround setup failed!\n"); > +} > + > +bool is_twl5030_errata27wa_required(void) static > +{ > + if (twl_get_si_type() == TWL_SIL_5030) > + return (twl_get_si_version() < TWL5030_REV_1_2); > + > + return 0; > +} > + > void __init twl4030_power_init(struct twl4030_power_data *twl4030_scripts) > { > int err = 0; > @@ -530,6 +585,15 @@ void __init twl4030_power_init(struct twl4030_power_data > *twl4030_scripts) > if (err) > goto unlock; > > + /* Applying TWL5030 Errata 27 WA based on Si revision & > + * flag updated from board file*/ > + if (is_twl5030_errata27wa_required()) { > + pr_info("TWL5030: Enabling workaround for Si Errata 27\n"); > + twl_errata27_workaround(); > + if (twl4030_scripts->twl5030_errata27wa_script) > + twl4030_scripts->twl5030_errata27wa_script(); > + } > + > for (i = 0; i < twl4030_scripts->num; i++) { > err = load_twl4030_script(twl4030_scripts->scripts[i], address); > if (err) > diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h > index d3cc2ac..d114229 100644 > --- a/include/linux/i2c/twl.h > +++ b/include/linux/i2c/twl.h > @@ -672,6 +672,7 @@ struct twl4030_power_data { > struct twl4030_script **scripts; > unsigned num; > struct twl4030_resconfig *resource_config; > + void (*twl5030_errata27wa_script)(void); > #define TWL4030_RESCONFIG_UNDEF ((u8)-1) > }; Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
