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https://github.com/edk2-porting/linux-next.git
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1963a2afc8
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>
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef __ARCH_ARM_MACH_MSM_GPIOMUX_V2_H
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#define __ARCH_ARM_MACH_MSM_GPIOMUX_V2_H
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#define GPIOMUX_NGPIOS 173
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typedef u16 gpiomux_config_t;
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enum {
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GPIOMUX_DRV_2MA = 0UL << 6,
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GPIOMUX_DRV_4MA = 1UL << 6,
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GPIOMUX_DRV_6MA = 2UL << 6,
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GPIOMUX_DRV_8MA = 3UL << 6,
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GPIOMUX_DRV_10MA = 4UL << 6,
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GPIOMUX_DRV_12MA = 5UL << 6,
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GPIOMUX_DRV_14MA = 6UL << 6,
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GPIOMUX_DRV_16MA = 7UL << 6,
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};
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enum {
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GPIOMUX_FUNC_GPIO = 0UL << 2,
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GPIOMUX_FUNC_1 = 1UL << 2,
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GPIOMUX_FUNC_2 = 2UL << 2,
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GPIOMUX_FUNC_3 = 3UL << 2,
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GPIOMUX_FUNC_4 = 4UL << 2,
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GPIOMUX_FUNC_5 = 5UL << 2,
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GPIOMUX_FUNC_6 = 6UL << 2,
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GPIOMUX_FUNC_7 = 7UL << 2,
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GPIOMUX_FUNC_8 = 8UL << 2,
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GPIOMUX_FUNC_9 = 9UL << 2,
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GPIOMUX_FUNC_A = 10UL << 2,
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GPIOMUX_FUNC_B = 11UL << 2,
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GPIOMUX_FUNC_C = 12UL << 2,
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GPIOMUX_FUNC_D = 13UL << 2,
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GPIOMUX_FUNC_E = 14UL << 2,
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GPIOMUX_FUNC_F = 15UL << 2,
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};
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enum {
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GPIOMUX_PULL_NONE = 0UL,
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GPIOMUX_PULL_DOWN = 1UL,
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GPIOMUX_PULL_KEEPER = 2UL,
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GPIOMUX_PULL_UP = 3UL,
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};
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#endif
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