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linux/drivers/mfd/twl4030-power.c
Amit Kucheria 75a7456539 mfd: Print warning for twl4030 out-of-order script loading 
When the sleep script is loaded before the wakeup script, there is a
chance that the system might go to sleep before the wakeup script
loading is completed. This will lead to a system that does not wakeup
and has been observed to cause non-booting boards.

Various options were considered to solve this problem, including
modification of the core twl4030 power code to be smart enough to
reorder the loading of the scripts. But it felt too over-engineered.

Hence this patch just warns the DPS script developer so that they may be
reordered in the board-code itself.

Signed-off-by: Amit Kucheria <amit.kucheria@verdurent.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2009-09-17 09:47:22 +02:00

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/*
* linux/drivers/i2c/chips/twl4030-power.c
*
* Handle TWL4030 Power initialization
*
* Copyright (C) 2008 Nokia Corporation
* Copyright (C) 2006 Texas Instruments, Inc
*
* Written by Kalle Jokiniemi
* Peter De Schrijver <peter.de-schrijver@nokia.com>
* Several fixes by Amit Kucheria <amit.kucheria@verdurent.com>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file "COPYING" in the main directory of this
* archive for more details.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/i2c/twl4030.h>
#include <linux/platform_device.h>
#include <asm/mach-types.h>
static u8 twl4030_start_script_address = 0x2b;
#define PWR_P1_SW_EVENTS 0x10
#define PWR_DEVOFF (1<<0)
#define PHY_TO_OFF_PM_MASTER(p) (p - 0x36)
#define PHY_TO_OFF_PM_RECEIVER(p) (p - 0x5b)
/* resource - hfclk */
#define R_HFCLKOUT_DEV_GRP PHY_TO_OFF_PM_RECEIVER(0xe6)
/* PM events */
#define R_P1_SW_EVENTS PHY_TO_OFF_PM_MASTER(0x46)
#define R_P2_SW_EVENTS PHY_TO_OFF_PM_MASTER(0x47)
#define R_P3_SW_EVENTS PHY_TO_OFF_PM_MASTER(0x48)
#define R_CFG_P1_TRANSITION PHY_TO_OFF_PM_MASTER(0x36)
#define R_CFG_P2_TRANSITION PHY_TO_OFF_PM_MASTER(0x37)
#define R_CFG_P3_TRANSITION PHY_TO_OFF_PM_MASTER(0x38)
#define LVL_WAKEUP 0x08
#define ENABLE_WARMRESET (1<<4)
#define END_OF_SCRIPT 0x3f
#define R_SEQ_ADD_A2S PHY_TO_OFF_PM_MASTER(0x55)
#define R_SEQ_ADD_S2A12 PHY_TO_OFF_PM_MASTER(0x56)
#define R_SEQ_ADD_S2A3 PHY_TO_OFF_PM_MASTER(0x57)
#define R_SEQ_ADD_WARM PHY_TO_OFF_PM_MASTER(0x58)
#define R_MEMORY_ADDRESS PHY_TO_OFF_PM_MASTER(0x59)
#define R_MEMORY_DATA PHY_TO_OFF_PM_MASTER(0x5a)
#define R_PROTECT_KEY 0x0E
#define KEY_1 0xC0
#define KEY_2 0x0C
/* resource configuration registers */
#define DEVGROUP_OFFSET 0
#define TYPE_OFFSET 1
/* Bit positions */
#define DEVGROUP_SHIFT 5
#define DEVGROUP_MASK (7 << DEVGROUP_SHIFT)
#define TYPE_SHIFT 0
#define TYPE_MASK (7 << TYPE_SHIFT)
#define TYPE2_SHIFT 3
#define TYPE2_MASK (3 << TYPE2_SHIFT)
static u8 res_config_addrs[] = {
[RES_VAUX1] = 0x17,
[RES_VAUX2] = 0x1b,
[RES_VAUX3] = 0x1f,
[RES_VAUX4] = 0x23,
[RES_VMMC1] = 0x27,
[RES_VMMC2] = 0x2b,
[RES_VPLL1] = 0x2f,
[RES_VPLL2] = 0x33,
[RES_VSIM] = 0x37,
[RES_VDAC] = 0x3b,
[RES_VINTANA1] = 0x3f,
[RES_VINTANA2] = 0x43,
[RES_VINTDIG] = 0x47,
[RES_VIO] = 0x4b,
[RES_VDD1] = 0x55,
[RES_VDD2] = 0x63,
[RES_VUSB_1V5] = 0x71,
[RES_VUSB_1V8] = 0x74,
[RES_VUSB_3V1] = 0x77,
[RES_VUSBCP] = 0x7a,
[RES_REGEN] = 0x7f,
[RES_NRES_PWRON] = 0x82,
[RES_CLKEN] = 0x85,
[RES_SYSEN] = 0x88,
[RES_HFCLKOUT] = 0x8b,
[RES_32KCLKOUT] = 0x8e,
[RES_RESET] = 0x91,
[RES_Main_Ref] = 0x94,
};
static int __init twl4030_write_script_byte(u8 address, u8 byte)
{
int err;
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, address,
R_MEMORY_ADDRESS);
if (err)
goto out;
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, byte,
R_MEMORY_DATA);
out:
return err;
}
static int __init twl4030_write_script_ins(u8 address, u16 pmb_message,
u8 delay, u8 next)
{
int err;
address *= 4;
err = twl4030_write_script_byte(address++, pmb_message >> 8);
if (err)
goto out;
err = twl4030_write_script_byte(address++, pmb_message & 0xff);
if (err)
goto out;
err = twl4030_write_script_byte(address++, delay);
if (err)
goto out;
err = twl4030_write_script_byte(address++, next);
out:
return err;
}
static int __init twl4030_write_script(u8 address, struct twl4030_ins *script,
int len)
{
int err;
for (; len; len--, address++, script++) {
if (len == 1) {
err = twl4030_write_script_ins(address,
script->pmb_message,
script->delay,
END_OF_SCRIPT);
if (err)
break;
} else {
err = twl4030_write_script_ins(address,
script->pmb_message,
script->delay,
address + 1);
if (err)
break;
}
}
return err;
}
static int __init twl4030_config_wakeup3_sequence(u8 address)
{
int err;
u8 data;
/* Set SLEEP to ACTIVE SEQ address for P3 */
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, address,
R_SEQ_ADD_S2A3);
if (err)
goto out;
/* P3 LVL_WAKEUP should be on LEVEL */
err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &data,
R_P3_SW_EVENTS);
if (err)
goto out;
data |= LVL_WAKEUP;
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, data,
R_P3_SW_EVENTS);
out:
if (err)
pr_err("TWL4030 wakeup sequence for P3 config error\n");
return err;
}
static int __init twl4030_config_wakeup12_sequence(u8 address)
{
int err = 0;
u8 data;
/* Set SLEEP to ACTIVE SEQ address for P1 and P2 */
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, address,
R_SEQ_ADD_S2A12);
if (err)
goto out;
/* P1/P2 LVL_WAKEUP should be on LEVEL */
err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &data,
R_P1_SW_EVENTS);
if (err)
goto out;
data |= LVL_WAKEUP;
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, data,
R_P1_SW_EVENTS);
if (err)
goto out;
err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &data,
R_P2_SW_EVENTS);
if (err)
goto out;
data |= LVL_WAKEUP;
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, data,
R_P2_SW_EVENTS);
if (err)
goto out;
if (machine_is_omap_3430sdp() || machine_is_omap_ldp()) {
/* Disabling AC charger effect on sleep-active transitions */
err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &data,
R_CFG_P1_TRANSITION);
if (err)
goto out;
data &= ~(1<<1);
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, data ,
R_CFG_P1_TRANSITION);
if (err)
goto out;
}
out:
if (err)
pr_err("TWL4030 wakeup sequence for P1 and P2" \
"config error\n");
return err;
}
static int __init twl4030_config_sleep_sequence(u8 address)
{
int err;
/* Set ACTIVE to SLEEP SEQ address in T2 memory*/
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, address,
R_SEQ_ADD_A2S);
if (err)
pr_err("TWL4030 sleep sequence config error\n");
return err;
}
static int __init twl4030_config_warmreset_sequence(u8 address)
{
int err;
u8 rd_data;
/* Set WARM RESET SEQ address for P1 */
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, address,
R_SEQ_ADD_WARM);
if (err)
goto out;
/* P1/P2/P3 enable WARMRESET */
err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &rd_data,
R_P1_SW_EVENTS);
if (err)
goto out;
rd_data |= ENABLE_WARMRESET;
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, rd_data,
R_P1_SW_EVENTS);
if (err)
goto out;
err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &rd_data,
R_P2_SW_EVENTS);
if (err)
goto out;
rd_data |= ENABLE_WARMRESET;
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, rd_data,
R_P2_SW_EVENTS);
if (err)
goto out;
err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &rd_data,
R_P3_SW_EVENTS);
if (err)
goto out;
rd_data |= ENABLE_WARMRESET;
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, rd_data,
R_P3_SW_EVENTS);
out:
if (err)
pr_err("TWL4030 warmreset seq config error\n");
return err;
}
static int __init twl4030_configure_resource(struct twl4030_resconfig *rconfig)
{
int rconfig_addr;
int err;
u8 type;
u8 grp;
if (rconfig->resource > TOTAL_RESOURCES) {
pr_err("TWL4030 Resource %d does not exist\n",
rconfig->resource);
return -EINVAL;
}
rconfig_addr = res_config_addrs[rconfig->resource];
/* Set resource group */
err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &grp,
rconfig_addr + DEVGROUP_OFFSET);
if (err) {
pr_err("TWL4030 Resource %d group could not be read\n",
rconfig->resource);
return err;
}
if (rconfig->devgroup >= 0) {
grp &= ~DEVGROUP_MASK;
grp |= rconfig->devgroup << DEVGROUP_SHIFT;
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
grp, rconfig_addr + DEVGROUP_OFFSET);
if (err < 0) {
pr_err("TWL4030 failed to program devgroup\n");
return err;
}
}
/* Set resource types */
err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &type,
rconfig_addr + TYPE_OFFSET);
if (err < 0) {
pr_err("TWL4030 Resource %d type could not be read\n",
rconfig->resource);
return err;
}
if (rconfig->type >= 0) {
type &= ~TYPE_MASK;
type |= rconfig->type << TYPE_SHIFT;
}
if (rconfig->type2 >= 0) {
type &= ~TYPE2_MASK;
type |= rconfig->type2 << TYPE2_SHIFT;
}
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
type, rconfig_addr + TYPE_OFFSET);
if (err < 0) {
pr_err("TWL4030 failed to program resource type\n");
return err;
}
return 0;
}
static int __init load_twl4030_script(struct twl4030_script *tscript,
u8 address)
{
int err;
static int order;
/* Make sure the script isn't going beyond last valid address (0x3f) */
if ((address + tscript->size) > END_OF_SCRIPT) {
pr_err("TWL4030 scripts too big error\n");
return -EINVAL;
}
err = twl4030_write_script(address, tscript->script, tscript->size);
if (err)
goto out;
if (tscript->flags & TWL4030_WRST_SCRIPT) {
err = twl4030_config_warmreset_sequence(address);
if (err)
goto out;
}
if (tscript->flags & TWL4030_WAKEUP12_SCRIPT) {
err = twl4030_config_wakeup12_sequence(address);
if (err)
goto out;
order = 1;
}
if (tscript->flags & TWL4030_WAKEUP3_SCRIPT) {
err = twl4030_config_wakeup3_sequence(address);
if (err)
goto out;
}
if (tscript->flags & TWL4030_SLEEP_SCRIPT)
if (order)
pr_warning("TWL4030: Bad order of scripts (sleep "\
"script before wakeup) Leads to boot"\
"failure on some boards\n");
err = twl4030_config_sleep_sequence(address);
out:
return err;
}
void __init twl4030_power_init(struct twl4030_power_data *twl4030_scripts)
{
int err = 0;
int i;
struct twl4030_resconfig *resconfig;
u8 address = twl4030_start_script_address;
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_1,
R_PROTECT_KEY);
if (err)
goto unlock;
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_2,
R_PROTECT_KEY);
if (err)
goto unlock;
for (i = 0; i < twl4030_scripts->num; i++) {
err = load_twl4030_script(twl4030_scripts->scripts[i], address);
if (err)
goto load;
address += twl4030_scripts->scripts[i]->size;
}
resconfig = twl4030_scripts->resource_config;
if (resconfig) {
while (resconfig->resource) {
err = twl4030_configure_resource(resconfig);
if (err)
goto resource;
resconfig++;
}
}
err = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, R_PROTECT_KEY);
if (err)
pr_err("TWL4030 Unable to relock registers\n");
return;
unlock:
if (err)
pr_err("TWL4030 Unable to unlock registers\n");
return;
load:
if (err)
pr_err("TWL4030 failed to load scripts\n");
return;
resource:
if (err)
pr_err("TWL4030 failed to configure resource\n");
return;
}
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