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mfd: twl4030-power: Add generic reset configuration 

The twl4030 PMIC needs to be configured properly for things like
warm reset and deeper idle states so the PMIC manages the regulators
properly based on the hardware triggers from the SoC. Earlier
we have configured twl4030 using platform data, but we want to
do it for device tree based booting also.

In some cases configuring twl4030 is needed for things to work.
For example, when rebooting an OMAP3530 at 125 MHz, it hangs.
With this patch, TWL4030 will be reset when a warm reset occures,
and OMAP3530 does not hang on reboot.

Let's add device tree support and configure things for warm reset
as the default when compatible = "ti,twl4030-power". More
complicated configurations can be added to the driver based on
other compatible flags.

Note we now also make the pdata const like it should be.
This allows use it for match->data with the device tree
related functions.

Based on earlier patch by Matthias Brugger <matthias.bgg@gmail.com>
and Lesly A M <leslyam@ti.com>.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
hifive-unleashed-5.1
Tony Lindgren 2014-05-20 11:17:54 -07:00 committed by Lee Jones
parent 320572813d
commit e7cd1d1eb1
3 changed files with 105 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Documentation/devicetree/bindings/mfd/twl4030-power.txt
View File

@ -5,7 +5,12 @@ to control the power resources, including power scripts. For now, the
binding only supports the complete shutdown of the system after poweroff.
Required properties:
- compatible : must be "ti,twl4030-power"
- compatible : must be one of the following
"ti,twl4030-power"
"ti,twl4030-power-reset"
The use of ti,twl4030-power-reset is recommended at least on
3530 that needs a special configuration for warm reset to work.
Optional properties:
- ti,use_poweroff: With this flag, the chip will initiates an ACTIVE-to-OFF or

109
drivers/mfd/twl4030-power.c
View File

@ -29,6 +29,7 @@
#include <linux/i2c/twl.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm/mach-types.h>
@ -128,6 +129,40 @@ static u8 res_config_addrs[] = {
[RES_MAIN_REF] = 0x94,
};
/*
* Usable values for .remap_sleep and .remap_off
* Based on table "5.3.3 Resource Operating modes"
*/
enum {
TWL_REMAP_OFF = 0,
TWL_REMAP_SLEEP = 8,
TWL_REMAP_ACTIVE = 9,
};
/*
* Macros to configure the PM register states for various resources.
* Note that we can make MSG_SINGULAR etc private to this driver once
* omap3 has been made DT only.
*/
#define TWL_DFLT_DELAY 2 /* typically 2 32 KiHz cycles */
#define TWL_RESOURCE_SET(res, state) \
{ MSG_SINGULAR(DEV_GRP_NULL, (res), (state)), TWL_DFLT_DELAY }
#define TWL_RESOURCE_ON(res) TWL_RESOURCE_SET(res, RES_STATE_ACTIVE)
#define TWL_RESOURCE_OFF(res) TWL_RESOURCE_SET(res, RES_STATE_OFF)
#define TWL_RESOURCE_RESET(res) TWL_RESOURCE_SET(res, RES_STATE_WRST)
/*
* It seems that type1 and type2 is just the resource init order
* number for the type1 and type2 group.
*/
#define TWL_RESOURCE_GROUP_RESET(group, type1, type2) \
{ MSG_BROADCAST(DEV_GRP_NULL, (group), (type1), (type2), \
RES_STATE_WRST), TWL_DFLT_DELAY }
#define TWL_REMAP_SLEEP(res, devgrp, typ, typ2) \
{ .resource = (res), .devgroup = (devgrp), \
.type = (typ), .type2 = (typ2), \
.remap_off = TWL_REMAP_OFF, \
.remap_sleep = TWL_REMAP_SLEEP, }
static int twl4030_write_script_byte(u8 address, u8 byte)
{
int err;
@ -502,7 +537,8 @@ int twl4030_remove_script(u8 flags)
return err;
}
static int twl4030_power_configure_scripts(struct twl4030_power_data *pdata)
static int
twl4030_power_configure_scripts(const struct twl4030_power_data *pdata)
{
int err;
int i;
@ -518,7 +554,8 @@ static int twl4030_power_configure_scripts(struct twl4030_power_data *pdata)
return 0;
}
static int twl4030_power_configure_resources(struct twl4030_power_data *pdata)
static int
twl4030_power_configure_resources(const struct twl4030_power_data *pdata)
{
struct twl4030_resconfig *resconfig = pdata->resource_config;
int err;
@ -550,7 +587,7 @@ void twl4030_power_off(void)
pr_err("TWL4030 Unable to power off\n");
}
static bool twl4030_power_use_poweroff(struct twl4030_power_data *pdata,
static bool twl4030_power_use_poweroff(const struct twl4030_power_data *pdata,
struct device_node *node)
{
if (pdata && pdata->use_poweroff)
@ -562,10 +599,60 @@ static bool twl4030_power_use_poweroff(struct twl4030_power_data *pdata,
return false;
}
#ifdef CONFIG_OF
/* Generic warm reset configuration for omap3 */
static struct twl4030_ins omap3_wrst_seq[] = {
TWL_RESOURCE_OFF(RES_NRES_PWRON),
TWL_RESOURCE_OFF(RES_RESET),
TWL_RESOURCE_RESET(RES_MAIN_REF),
TWL_RESOURCE_GROUP_RESET(RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R2),
TWL_RESOURCE_RESET(RES_VUSB_3V1),
TWL_RESOURCE_GROUP_RESET(RES_GRP_ALL, RES_TYPE_R0, RES_TYPE2_R1),
TWL_RESOURCE_GROUP_RESET(RES_GRP_RC, RES_TYPE_ALL, RES_TYPE2_R0),
TWL_RESOURCE_ON(RES_RESET),
TWL_RESOURCE_ON(RES_NRES_PWRON),
};
static struct twl4030_script omap3_wrst_script = {
.script = omap3_wrst_seq,
.size = ARRAY_SIZE(omap3_wrst_seq),
.flags = TWL4030_WRST_SCRIPT,
};
static struct twl4030_script *omap3_reset_scripts[] = {
&omap3_wrst_script,
};
static struct twl4030_resconfig omap3_rconfig[] = {
TWL_REMAP_SLEEP(RES_HFCLKOUT, DEV_GRP_P3, -1, -1),
TWL_REMAP_SLEEP(RES_VDD1, DEV_GRP_P1, -1, -1),
TWL_REMAP_SLEEP(RES_VDD2, DEV_GRP_P1, -1, -1),
{ 0, 0 },
};
static struct twl4030_power_data omap3_reset = {
.scripts = omap3_reset_scripts,
.num = ARRAY_SIZE(omap3_reset_scripts),
.resource_config = omap3_rconfig,
};
static struct of_device_id twl4030_power_of_match[] = {
{
.compatible = "ti,twl4030-power-reset",
.data = &omap3_reset,
},
{ },
};
MODULE_DEVICE_TABLE(of, twl4030_power_of_match);
#endif /* CONFIG_OF */
static int twl4030_power_probe(struct platform_device *pdev)
{
struct twl4030_power_data *pdata = dev_get_platdata(&pdev->dev);
const struct twl4030_power_data *pdata = dev_get_platdata(&pdev->dev);
struct device_node *node = pdev->dev.of_node;
const struct of_device_id *match;
int err = 0;
int err2 = 0;
u8 val;
@ -586,8 +673,12 @@ static int twl4030_power_probe(struct platform_device *pdev)
return err;
}
match = of_match_device(of_match_ptr(twl4030_power_of_match),
&pdev->dev);
if (match && match->data)
pdata = match->data;
if (pdata) {
/* TODO: convert to device tree */
err = twl4030_power_configure_scripts(pdata);
if (err) {
pr_err("TWL4030 failed to load scripts\n");
@ -637,14 +728,6 @@ static int twl4030_power_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id twl4030_power_of_match[] = {
{.compatible = "ti,twl4030-power", },
{ },
};
MODULE_DEVICE_TABLE(of, twl4030_power_of_match);
#endif
static struct platform_driver twl4030_power_driver = {
.driver = {
.name = "twl4030_power",

3
include/linux/i2c/twl.h
View File

@ -486,7 +486,10 @@ static inline int twl6030_mmc_card_detect(struct device *dev, int slot)
#define RES_GRP_ALL 0x7 /* All resource groups */
#define RES_TYPE2_R0 0x0
#define RES_TYPE2_R1 0x1
#define RES_TYPE2_R2 0x2
#define RES_TYPE_R0 0x0
#define RES_TYPE_ALL 0x7
/* Resource states */