msm: add gpiomux api for gpio multiplex & configuration.
Add the 'gpiomux' api, which addresses the following shortcomings
of existing tlmm api:
- gpio power-collapse, which is managed by a peripheral processor on
other targets, must be managed by the application processor on the 8x60.
- The enable/disable flag of the legacy gpio_tlmm_config api
is not applicable on the 8x60, and causes confusion.
- The gpio 'direction' bits are meaningless for all func_sel
configurations except for generic-gpio mode (func_sel 0), in which
case the gpio_direction_* functions should be used. Having these
bits in the tlmm api leads to confusion and misuse of the gpiolib
api, and they have been removed in gpiomux.
- The functional api of the legacy system ran contrary to the typical
use-case, which is a single massive configuration at boot. Rather
than forcing hundreds of 'config' function calls, the new api
allows data to be configured with a single table.
gpiomux_get and gpiomux_put are meant to be called automatically
when gpio_request and gpio_free are called, giving automatic
gpiomux/tlmm control to those drivers/lines with simple
power profiles - in the simplest cases, an entry in the gpiomux table
and the correct usage of gpiolib is all that is required to get proper
gpio power control.
Signed-off-by: Gregory Bean <gbean@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
2010-08-28 21:05:44 +04:00
/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
*
* This program is free software ; you can redistribute it and / or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation .
*
* 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 . , 51 Franklin Street , Fifth Floor , Boston , MA
* 02110 - 1301 , USA .
*/
# include "gpiomux.h"
2010-08-28 21:05:46 +04:00
struct msm_gpiomux_config msm_gpiomux_configs [ GPIOMUX_NGPIOS ] = {
[ 86 ] = { /* UART3 RX */
. suspended = GPIOMUX_DRV_2MA | GPIOMUX_PULL_DOWN |
GPIOMUX_FUNC_1 | GPIOMUX_VALID ,
} ,
[ 87 ] = { /* UART3 TX */
. suspended = GPIOMUX_DRV_2MA | GPIOMUX_PULL_DOWN |
GPIOMUX_FUNC_1 | GPIOMUX_VALID ,
} ,
} ;
