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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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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>
34 lines
1.2 KiB
C
34 lines
1.2 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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#include <linux/kernel.h>
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#include "gpiomux.h"
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#include "proc_comm.h"
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void __msm_gpiomux_write(unsigned gpio, gpiomux_config_t val)
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{
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unsigned tlmm_config = (val & ~GPIOMUX_CTL_MASK) |
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((gpio & 0x3ff) << 4);
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unsigned tlmm_disable = 0;
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int rc;
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rc = msm_proc_comm(PCOM_RPC_GPIO_TLMM_CONFIG_EX,
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&tlmm_config, &tlmm_disable);
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if (rc)
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pr_err("%s: unexpected proc_comm failure %d: %08x %08x\n",
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__func__, rc, tlmm_config, tlmm_disable);
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}
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