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91ba4976c0
Some Qualcomm boards feature reserved ranges of pins which are protected by firmware. Attempting to read or write any registers associated with these pins results the board resetting. Add support for parsing these ranges from devicetree and ensure that the pinctrl and GPIO drivers don't try to interact with these pins. Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com> Link: https://lore.kernel.org/r/20250410-topic-sm8x50-pinctrl-reserved-ranges-v2-1-654488392b9a@linaro.org Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Qualcomm common pin control data.
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*
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* Copyright (C) 2023 Linaro Ltd.
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*/
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#ifndef _QCOM_GPIO_H_
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#define _QCOM_GPIO_H_
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#include <asm/types.h>
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#include <stdbool.h>
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struct msm_special_pin_data {
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char *name;
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u32 ctl_reg;
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u32 io_reg;
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unsigned pull_bit:5;
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unsigned drv_bit:5;
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unsigned oe_bit:5;
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unsigned in_bit:5;
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unsigned out_bit:5;
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};
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struct msm_pin_data {
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int pin_count;
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const unsigned int *pin_offsets;
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unsigned int special_pins_start;
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const struct msm_special_pin_data *special_pins_data;
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};
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static inline u32 qcom_pin_offset(const unsigned int *offs, unsigned int selector)
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{
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u32 out = (selector * 0x1000);
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if (offs)
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return out + offs[selector];
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return out;
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}
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static inline bool qcom_is_special_pin(const struct msm_pin_data *pindata, unsigned int pin)
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{
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return pindata->special_pins_start && pin >= pindata->special_pins_start;
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}
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struct udevice;
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/**
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* msm_pinctrl_is_reserved() - Check if a pin lies in a reserved range
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*
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* @dev: pinctrl device
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* @pin: Pin number
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*
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* Returns: true if pin is reserved, otherwise false
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*
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* Call using dev_get_parent() from the GPIO device, it is a child of
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* the pinctrl device.
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*/
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bool msm_pinctrl_is_reserved(struct udevice *dev, unsigned int pin);
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#endif /* _QCOM_GPIO_H_ */
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