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linux_dsm_epyc7002/drivers/mfd/twl4030-power.c
Arnd Bergmann f65e9eacfa mfd: twl4030: Don't warn about uninitialized return code 
If the twl4030_write_script function gets called with
a zero length argument, its return value does not
get set. We know that all scripts have a nonzero
length, but returning an error in case they ever
do is probably appropriate.

Without this patch, building omap2plus_defconfig results in:

drivers/mfd/twl4030-power.c: In function 'load_twl4030_script':
drivers/mfd/twl4030-power.c:414:5: error: 'err' may be used uninitialized in this function

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: "Kristo, Tero" <t-kristo@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2013-01-27 02:18:01 +01:00

586 lines
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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/twl.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 SEQ_OFFSYNC (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)
/* resource configuration registers
<RESOURCE>_DEV_GRP at address 'n+0'
<RESOURCE>_TYPE at address 'n+1'
<RESOURCE>_REMAP at address 'n+2'
<RESOURCE>_DEDICATED at address 'n+3'
*/
#define DEV_GRP_OFFSET 0
#define TYPE_OFFSET 1
#define REMAP_OFFSET 2
#define DEDICATED_OFFSET 3
/* Bit positions in the registers */
/* <RESOURCE>_DEV_GRP */
#define DEV_GRP_SHIFT 5
#define DEV_GRP_MASK (7 << DEV_GRP_SHIFT)
/* <RESOURCE>_TYPE */
#define TYPE_SHIFT 0
#define TYPE_MASK (7 << TYPE_SHIFT)
#define TYPE2_SHIFT 3
#define TYPE2_MASK (3 << TYPE2_SHIFT)
/* <RESOURCE>_REMAP */
#define SLEEP_STATE_SHIFT 0
#define SLEEP_STATE_MASK (0xf << SLEEP_STATE_SHIFT)
#define OFF_STATE_SHIFT 4
#define OFF_STATE_MASK (0xf << OFF_STATE_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 twl4030_write_script_byte(u8 address, u8 byte)
{
int err;
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, address, R_MEMORY_ADDRESS);
if (err)
goto out;
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, byte, R_MEMORY_DATA);
out:
return err;
}
static int 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 twl4030_write_script(u8 address, struct twl4030_ins *script,
int len)
{
int err = -EINVAL;
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 twl4030_config_wakeup3_sequence(u8 address)
{
int err;
u8 data;
/* Set SLEEP to ACTIVE SEQ address for P3 */
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, address, R_SEQ_ADD_S2A3);
if (err)
goto out;
/* P3 LVL_WAKEUP should be on LEVEL */
err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &data, R_P3_SW_EVENTS);
if (err)
goto out;
data |= LVL_WAKEUP;
err = twl_i2c_write_u8(TWL_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 twl4030_config_wakeup12_sequence(u8 address)
{
int err = 0;
u8 data;
/* Set SLEEP to ACTIVE SEQ address for P1 and P2 */
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, address, R_SEQ_ADD_S2A12);
if (err)
goto out;
/* P1/P2 LVL_WAKEUP should be on LEVEL */
err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &data, R_P1_SW_EVENTS);
if (err)
goto out;
data |= LVL_WAKEUP;
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, data, R_P1_SW_EVENTS);
if (err)
goto out;
err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &data, R_P2_SW_EVENTS);
if (err)
goto out;
data |= LVL_WAKEUP;
err = twl_i2c_write_u8(TWL_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 = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &data,
R_CFG_P1_TRANSITION);
if (err)
goto out;
data &= ~(1<<1);
err = twl_i2c_write_u8(TWL_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 twl4030_config_sleep_sequence(u8 address)
{
int err;
/* Set ACTIVE to SLEEP SEQ address in T2 memory*/
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, address, R_SEQ_ADD_A2S);
if (err)
pr_err("TWL4030 sleep sequence config error\n");
return err;
}
static int twl4030_config_warmreset_sequence(u8 address)
{
int err;
u8 rd_data;
/* Set WARM RESET SEQ address for P1 */
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, address, R_SEQ_ADD_WARM);
if (err)
goto out;
/* P1/P2/P3 enable WARMRESET */
err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &rd_data, R_P1_SW_EVENTS);
if (err)
goto out;
rd_data |= ENABLE_WARMRESET;
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, rd_data, R_P1_SW_EVENTS);
if (err)
goto out;
err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &rd_data, R_P2_SW_EVENTS);
if (err)
goto out;
rd_data |= ENABLE_WARMRESET;
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, rd_data, R_P2_SW_EVENTS);
if (err)
goto out;
err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &rd_data, R_P3_SW_EVENTS);
if (err)
goto out;
rd_data |= ENABLE_WARMRESET;
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, rd_data, R_P3_SW_EVENTS);
out:
if (err)
pr_err("TWL4030 warmreset seq config error\n");
return err;
}
static int twl4030_configure_resource(struct twl4030_resconfig *rconfig)
{
int rconfig_addr;
int err;
u8 type;
u8 grp;
u8 remap;
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 = twl_i2c_read_u8(TWL_MODULE_PM_RECEIVER, &grp,
rconfig_addr + DEV_GRP_OFFSET);
if (err) {
pr_err("TWL4030 Resource %d group could not be read\n",
rconfig->resource);
return err;
}
if (rconfig->devgroup != TWL4030_RESCONFIG_UNDEF) {
grp &= ~DEV_GRP_MASK;
grp |= rconfig->devgroup << DEV_GRP_SHIFT;
err = twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER,
grp, rconfig_addr + DEV_GRP_OFFSET);
if (err < 0) {
pr_err("TWL4030 failed to program devgroup\n");
return err;
}
}
/* Set resource types */
err = twl_i2c_read_u8(TWL_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 != TWL4030_RESCONFIG_UNDEF) {
type &= ~TYPE_MASK;
type |= rconfig->type << TYPE_SHIFT;
}
if (rconfig->type2 != TWL4030_RESCONFIG_UNDEF) {
type &= ~TYPE2_MASK;
type |= rconfig->type2 << TYPE2_SHIFT;
}
err = twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER,
type, rconfig_addr + TYPE_OFFSET);
if (err < 0) {
pr_err("TWL4030 failed to program resource type\n");
return err;
}
/* Set remap states */
err = twl_i2c_read_u8(TWL_MODULE_PM_RECEIVER, &remap,
rconfig_addr + REMAP_OFFSET);
if (err < 0) {
pr_err("TWL4030 Resource %d remap could not be read\n",
rconfig->resource);
return err;
}
if (rconfig->remap_off != TWL4030_RESCONFIG_UNDEF) {
remap &= ~OFF_STATE_MASK;
remap |= rconfig->remap_off << OFF_STATE_SHIFT;
}
if (rconfig->remap_sleep != TWL4030_RESCONFIG_UNDEF) {
remap &= ~SLEEP_STATE_MASK;
remap |= rconfig->remap_sleep << SLEEP_STATE_SHIFT;
}
err = twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER,
remap,
rconfig_addr + REMAP_OFFSET);
if (err < 0) {
pr_err("TWL4030 failed to program remap\n");
return err;
}
return 0;
}
static int 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;
}
int twl4030_remove_script(u8 flags)
{
int err = 0;
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG1,
TWL4030_PM_MASTER_PROTECT_KEY);
if (err) {
pr_err("twl4030: unable to unlock PROTECT_KEY\n");
return err;
}
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG2,
TWL4030_PM_MASTER_PROTECT_KEY);
if (err) {
pr_err("twl4030: unable to unlock PROTECT_KEY\n");
return err;
}
if (flags & TWL4030_WRST_SCRIPT) {
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, END_OF_SCRIPT,
R_SEQ_ADD_WARM);
if (err)
return err;
}
if (flags & TWL4030_WAKEUP12_SCRIPT) {
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, END_OF_SCRIPT,
R_SEQ_ADD_S2A12);
if (err)
return err;
}
if (flags & TWL4030_WAKEUP3_SCRIPT) {
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, END_OF_SCRIPT,
R_SEQ_ADD_S2A3);
if (err)
return err;
}
if (flags & TWL4030_SLEEP_SCRIPT) {
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, END_OF_SCRIPT,
R_SEQ_ADD_A2S);
if (err)
return err;
}
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, 0,
TWL4030_PM_MASTER_PROTECT_KEY);
if (err)
pr_err("TWL4030 Unable to relock registers\n");
return err;
}
/*
* In master mode, start the power off sequence.
* After a successful execution, TWL shuts down the power to the SoC
* and all peripherals connected to it.
*/
void twl4030_power_off(void)
{
int err;
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, PWR_DEVOFF,
TWL4030_PM_MASTER_P1_SW_EVENTS);
if (err)
pr_err("TWL4030 Unable to power off\n");
}
void twl4030_power_init(struct twl4030_power_data *twl4030_scripts)
{
int err = 0;
int i;
struct twl4030_resconfig *resconfig;
u8 val, address = twl4030_start_script_address;
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG1,
TWL4030_PM_MASTER_PROTECT_KEY);
if (err)
goto unlock;
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG2,
TWL4030_PM_MASTER_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++;
}
}
/* Board has to be wired properly to use this feature */
if (twl4030_scripts->use_poweroff && !pm_power_off) {
/* Default for SEQ_OFFSYNC is set, lets ensure this */
err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
TWL4030_PM_MASTER_CFG_P123_TRANSITION);
if (err) {
pr_warning("TWL4030 Unable to read registers\n");
} else if (!(val & SEQ_OFFSYNC)) {
val |= SEQ_OFFSYNC;
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val,
TWL4030_PM_MASTER_CFG_P123_TRANSITION);
if (err) {
pr_err("TWL4030 Unable to setup SEQ_OFFSYNC\n");
goto relock;
}
}
pm_power_off = twl4030_power_off;
}
relock:
err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, 0,
TWL4030_PM_MASTER_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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