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![Fan Wu](/assets/img/avatar_default.png)
What the patch does: 1. Call pinmux_disable_setting ahead of pinmux_enable_setting each time pinctrl_select_state is called 2. Remove the HW disable operation in pinmux_disable_setting function. 3. Remove the disable ops in struct pinmux_ops 4. Remove all the disable ops users in current code base. Notes: 1. Great thanks for the suggestion from Linus, Tony Lindgren and Stephen Warren and Everyone that shared comments on this patch. 2. The patch also includes comment fixes from Stephen Warren. The reason why we do this: 1. To avoid duplicated calling of the enable_setting operation without disabling operation inbetween which will let the pin descriptor desc->mux_usecount increase monotonously. 2. The HW pin disable operation is not useful for any of the existing platforms. And this can be used to avoid the HW glitch after using the item #1 modification. In the following case, the issue can be reproduced: 1. There is a driver that need to switch pin state dynamically, e.g. between "sleep" and "default" state 2. The pin setting configuration in a DTS node may be like this: component a { pinctrl-names = "default", "sleep"; pinctrl-0 = <&a_grp_setting &c_grp_setting>; pinctrl-1 = <&b_grp_setting &c_grp_setting>; } The "c_grp_setting" config node is totally identical, maybe like following one: c_grp_setting: c_grp_setting { pinctrl-single,pins = <GPIO48 AF6>; } 3. When switching the pin state in the following official pinctrl sequence: pin = pinctrl_get(); state = pinctrl_lookup_state(wanted_state); pinctrl_select_state(state); pinctrl_put(); Test Result: 1. The switch is completed as expected, that is: the device's pin configuration is changed according to the description in the "wanted_state" group setting 2. The "desc->mux_usecount" of the corresponding pins in "c_group" is increased without being decreased, because the "desc" is for each physical pin while the setting is for each setting node in the DTS. Thus, if the "c_grp_setting" in pinctrl-0 is not disabled ahead of enabling "c_grp_setting" in pinctrl-1, the desc->mux_usecount will keep increasing without any chance to be decreased. According to the comments in the original code, only the setting, in old state but not in new state, will be "disabled" (calling pinmux_disable_setting), which is correct logic but not intact. We still need consider case that the setting is in both old state and new state. We can do this in the following two ways: 1. Avoid to "enable"(calling pinmux_enable_setting) the "same pin setting" repeatedly 2. "Disable"(calling pinmux_disable_setting) the "same pin setting", actually two setting instances, ahead of enabling them. Analysis: 1. The solution #2 is better because it can avoid too much iteration. 2. If we disable all of the settings in the old state and one of the setting(s) exist in the new state, the pins mux function change may happen when some SoC vendors defined the "pinctrl-single,function-off" in their DTS file. old_setting => disabled_setting => new_setting. 3. In the pinmux framework, when a pin state is switched, the setting in the old state should be marked as "disabled". Conclusion: 1. To Remove the HW disabling operation to above the glitch mentioned above. 2. Handle the issue mentioned above by disabling all of the settings in old state and then enable the all of the settings in new state. Signed-off-by: Fan Wu <fwu@marvell.com> Acked-by: Stephen Warren <swarren@nvidia.com> Acked-by: Patrice Chotard <patrice.chotard@st.com> Acked-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Maxime Coquelin <maxime.coquelin@st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
671 lines
17 KiB
C
671 lines
17 KiB
C
/*
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* Core driver for the pin muxing portions of the pin control subsystem
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*
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* Copyright (C) 2011-2012 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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* Based on bits of regulator core, gpio core and clk core
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#define pr_fmt(fmt) "pinmux core: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/radix-tree.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/string.h>
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#include <linux/sysfs.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/pinctrl/machine.h>
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#include <linux/pinctrl/pinmux.h>
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#include "core.h"
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#include "pinmux.h"
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int pinmux_check_ops(struct pinctrl_dev *pctldev)
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{
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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unsigned nfuncs;
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unsigned selector = 0;
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/* Check that we implement required operations */
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if (!ops ||
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!ops->get_functions_count ||
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!ops->get_function_name ||
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!ops->get_function_groups ||
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!ops->enable) {
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dev_err(pctldev->dev, "pinmux ops lacks necessary functions\n");
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return -EINVAL;
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}
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/* Check that all functions registered have names */
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nfuncs = ops->get_functions_count(pctldev);
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while (selector < nfuncs) {
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const char *fname = ops->get_function_name(pctldev,
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selector);
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if (!fname) {
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dev_err(pctldev->dev, "pinmux ops has no name for function%u\n",
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selector);
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return -EINVAL;
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}
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selector++;
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}
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return 0;
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}
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int pinmux_validate_map(struct pinctrl_map const *map, int i)
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{
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if (!map->data.mux.function) {
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pr_err("failed to register map %s (%d): no function given\n",
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map->name, i);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* pin_request() - request a single pin to be muxed in, typically for GPIO
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* @pin: the pin number in the global pin space
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* @owner: a representation of the owner of this pin; typically the device
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* name that controls its mux function, or the requested GPIO name
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* @gpio_range: the range matching the GPIO pin if this is a request for a
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* single GPIO pin
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*/
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static int pin_request(struct pinctrl_dev *pctldev,
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int pin, const char *owner,
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struct pinctrl_gpio_range *gpio_range)
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{
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struct pin_desc *desc;
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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int status = -EINVAL;
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desc = pin_desc_get(pctldev, pin);
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if (desc == NULL) {
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dev_err(pctldev->dev,
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"pin %d is not registered so it cannot be requested\n",
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pin);
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goto out;
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}
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dev_dbg(pctldev->dev, "request pin %d (%s) for %s\n",
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pin, desc->name, owner);
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if (gpio_range) {
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/* There's no need to support multiple GPIO requests */
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if (desc->gpio_owner) {
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dev_err(pctldev->dev,
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"pin %s already requested by %s; cannot claim for %s\n",
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desc->name, desc->gpio_owner, owner);
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goto out;
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}
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desc->gpio_owner = owner;
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} else {
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if (desc->mux_usecount && strcmp(desc->mux_owner, owner)) {
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dev_err(pctldev->dev,
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"pin %s already requested by %s; cannot claim for %s\n",
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desc->name, desc->mux_owner, owner);
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goto out;
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}
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desc->mux_usecount++;
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if (desc->mux_usecount > 1)
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return 0;
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desc->mux_owner = owner;
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}
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/* Let each pin increase references to this module */
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if (!try_module_get(pctldev->owner)) {
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dev_err(pctldev->dev,
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"could not increase module refcount for pin %d\n",
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pin);
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status = -EINVAL;
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goto out_free_pin;
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}
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/*
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* If there is no kind of request function for the pin we just assume
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* we got it by default and proceed.
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*/
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if (gpio_range && ops->gpio_request_enable)
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/* This requests and enables a single GPIO pin */
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status = ops->gpio_request_enable(pctldev, gpio_range, pin);
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else if (ops->request)
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status = ops->request(pctldev, pin);
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else
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status = 0;
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if (status) {
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dev_err(pctldev->dev, "request() failed for pin %d\n", pin);
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module_put(pctldev->owner);
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}
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out_free_pin:
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if (status) {
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if (gpio_range) {
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desc->gpio_owner = NULL;
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} else {
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desc->mux_usecount--;
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if (!desc->mux_usecount)
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desc->mux_owner = NULL;
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}
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}
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out:
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if (status)
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dev_err(pctldev->dev, "pin-%d (%s) status %d\n",
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pin, owner, status);
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return status;
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}
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/**
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* pin_free() - release a single muxed in pin so something else can be muxed
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* @pctldev: pin controller device handling this pin
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* @pin: the pin to free
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* @gpio_range: the range matching the GPIO pin if this is a request for a
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* single GPIO pin
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*
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* This function returns a pointer to the previous owner. This is used
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* for callers that dynamically allocate an owner name so it can be freed
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* once the pin is free. This is done for GPIO request functions.
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*/
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static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
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struct pinctrl_gpio_range *gpio_range)
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{
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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struct pin_desc *desc;
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const char *owner;
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desc = pin_desc_get(pctldev, pin);
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if (desc == NULL) {
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dev_err(pctldev->dev,
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"pin is not registered so it cannot be freed\n");
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return NULL;
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}
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if (!gpio_range) {
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/*
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* A pin should not be freed more times than allocated.
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*/
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if (WARN_ON(!desc->mux_usecount))
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return NULL;
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desc->mux_usecount--;
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if (desc->mux_usecount)
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return NULL;
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}
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/*
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* If there is no kind of request function for the pin we just assume
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* we got it by default and proceed.
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*/
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if (gpio_range && ops->gpio_disable_free)
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ops->gpio_disable_free(pctldev, gpio_range, pin);
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else if (ops->free)
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ops->free(pctldev, pin);
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if (gpio_range) {
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owner = desc->gpio_owner;
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desc->gpio_owner = NULL;
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} else {
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owner = desc->mux_owner;
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desc->mux_owner = NULL;
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desc->mux_setting = NULL;
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}
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module_put(pctldev->owner);
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return owner;
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}
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/**
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* pinmux_request_gpio() - request pinmuxing for a GPIO pin
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* @pctldev: pin controller device affected
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* @pin: the pin to mux in for GPIO
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* @range: the applicable GPIO range
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*/
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int pinmux_request_gpio(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned pin, unsigned gpio)
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{
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const char *owner;
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int ret;
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/* Conjure some name stating what chip and pin this is taken by */
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owner = kasprintf(GFP_KERNEL, "%s:%d", range->name, gpio);
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if (!owner)
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return -EINVAL;
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ret = pin_request(pctldev, pin, owner, range);
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if (ret < 0)
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kfree(owner);
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return ret;
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}
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/**
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* pinmux_free_gpio() - release a pin from GPIO muxing
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* @pctldev: the pin controller device for the pin
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* @pin: the affected currently GPIO-muxed in pin
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* @range: applicable GPIO range
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*/
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void pinmux_free_gpio(struct pinctrl_dev *pctldev, unsigned pin,
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struct pinctrl_gpio_range *range)
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{
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const char *owner;
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owner = pin_free(pctldev, pin, range);
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kfree(owner);
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}
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/**
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* pinmux_gpio_direction() - set the direction of a single muxed-in GPIO pin
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* @pctldev: the pin controller handling this pin
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* @range: applicable GPIO range
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* @pin: the affected GPIO pin in this controller
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* @input: true if we set the pin as input, false for output
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*/
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int pinmux_gpio_direction(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned pin, bool input)
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{
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const struct pinmux_ops *ops;
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int ret;
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ops = pctldev->desc->pmxops;
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if (ops->gpio_set_direction)
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ret = ops->gpio_set_direction(pctldev, range, pin, input);
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else
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ret = 0;
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return ret;
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}
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static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev,
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const char *function)
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{
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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unsigned nfuncs = ops->get_functions_count(pctldev);
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unsigned selector = 0;
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/* See if this pctldev has this function */
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while (selector < nfuncs) {
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const char *fname = ops->get_function_name(pctldev,
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selector);
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if (!strcmp(function, fname))
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return selector;
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selector++;
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}
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pr_err("%s does not support function %s\n",
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pinctrl_dev_get_name(pctldev), function);
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return -EINVAL;
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}
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int pinmux_map_to_setting(struct pinctrl_map const *map,
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struct pinctrl_setting *setting)
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{
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struct pinctrl_dev *pctldev = setting->pctldev;
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const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
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char const * const *groups;
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unsigned num_groups;
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int ret;
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const char *group;
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int i;
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if (!pmxops) {
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dev_err(pctldev->dev, "does not support mux function\n");
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return -EINVAL;
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}
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ret = pinmux_func_name_to_selector(pctldev, map->data.mux.function);
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if (ret < 0) {
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dev_err(pctldev->dev, "invalid function %s in map table\n",
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map->data.mux.function);
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return ret;
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}
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setting->data.mux.func = ret;
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ret = pmxops->get_function_groups(pctldev, setting->data.mux.func,
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&groups, &num_groups);
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if (ret < 0) {
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dev_err(pctldev->dev, "can't query groups for function %s\n",
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map->data.mux.function);
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return ret;
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}
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if (!num_groups) {
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dev_err(pctldev->dev,
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"function %s can't be selected on any group\n",
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map->data.mux.function);
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return -EINVAL;
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}
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if (map->data.mux.group) {
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bool found = false;
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group = map->data.mux.group;
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for (i = 0; i < num_groups; i++) {
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if (!strcmp(group, groups[i])) {
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found = true;
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break;
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}
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}
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if (!found) {
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dev_err(pctldev->dev,
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"invalid group \"%s\" for function \"%s\"\n",
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group, map->data.mux.function);
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return -EINVAL;
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}
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} else {
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group = groups[0];
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}
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ret = pinctrl_get_group_selector(pctldev, group);
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if (ret < 0) {
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dev_err(pctldev->dev, "invalid group %s in map table\n",
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map->data.mux.group);
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return ret;
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}
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setting->data.mux.group = ret;
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return 0;
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}
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void pinmux_free_setting(struct pinctrl_setting const *setting)
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{
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/* This function is currently unused */
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}
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int pinmux_enable_setting(struct pinctrl_setting const *setting)
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{
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struct pinctrl_dev *pctldev = setting->pctldev;
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const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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int ret = 0;
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const unsigned *pins = NULL;
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unsigned num_pins = 0;
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int i;
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struct pin_desc *desc;
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if (pctlops->get_group_pins)
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ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
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&pins, &num_pins);
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if (ret) {
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const char *gname;
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/* errors only affect debug data, so just warn */
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gname = pctlops->get_group_name(pctldev,
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setting->data.mux.group);
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dev_warn(pctldev->dev,
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"could not get pins for group %s\n",
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gname);
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num_pins = 0;
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}
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/* Try to allocate all pins in this group, one by one */
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for (i = 0; i < num_pins; i++) {
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ret = pin_request(pctldev, pins[i], setting->dev_name, NULL);
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if (ret) {
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const char *gname;
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const char *pname;
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desc = pin_desc_get(pctldev, pins[i]);
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pname = desc ? desc->name : "non-existing";
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gname = pctlops->get_group_name(pctldev,
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setting->data.mux.group);
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dev_err(pctldev->dev,
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"could not request pin %d (%s) from group %s "
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" on device %s\n",
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pins[i], pname, gname,
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pinctrl_dev_get_name(pctldev));
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goto err_pin_request;
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}
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}
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/* Now that we have acquired the pins, encode the mux setting */
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for (i = 0; i < num_pins; i++) {
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desc = pin_desc_get(pctldev, pins[i]);
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if (desc == NULL) {
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dev_warn(pctldev->dev,
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"could not get pin desc for pin %d\n",
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pins[i]);
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continue;
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}
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desc->mux_setting = &(setting->data.mux);
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}
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ret = ops->enable(pctldev, setting->data.mux.func,
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setting->data.mux.group);
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if (ret)
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goto err_enable;
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return 0;
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err_enable:
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for (i = 0; i < num_pins; i++) {
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desc = pin_desc_get(pctldev, pins[i]);
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if (desc)
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desc->mux_setting = NULL;
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}
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err_pin_request:
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/* On error release all taken pins */
|
|
while (--i >= 0)
|
|
pin_free(pctldev, pins[i], NULL);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void pinmux_disable_setting(struct pinctrl_setting const *setting)
|
|
{
|
|
struct pinctrl_dev *pctldev = setting->pctldev;
|
|
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
|
|
int ret = 0;
|
|
const unsigned *pins = NULL;
|
|
unsigned num_pins = 0;
|
|
int i;
|
|
struct pin_desc *desc;
|
|
|
|
if (pctlops->get_group_pins)
|
|
ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
|
|
&pins, &num_pins);
|
|
if (ret) {
|
|
const char *gname;
|
|
|
|
/* errors only affect debug data, so just warn */
|
|
gname = pctlops->get_group_name(pctldev,
|
|
setting->data.mux.group);
|
|
dev_warn(pctldev->dev,
|
|
"could not get pins for group %s\n",
|
|
gname);
|
|
num_pins = 0;
|
|
}
|
|
|
|
/* Flag the descs that no setting is active */
|
|
for (i = 0; i < num_pins; i++) {
|
|
desc = pin_desc_get(pctldev, pins[i]);
|
|
if (desc == NULL) {
|
|
dev_warn(pctldev->dev,
|
|
"could not get pin desc for pin %d\n",
|
|
pins[i]);
|
|
continue;
|
|
}
|
|
if (desc->mux_setting == &(setting->data.mux)) {
|
|
desc->mux_setting = NULL;
|
|
/* And release the pin */
|
|
pin_free(pctldev, pins[i], NULL);
|
|
} else {
|
|
const char *gname;
|
|
|
|
gname = pctlops->get_group_name(pctldev,
|
|
setting->data.mux.group);
|
|
dev_warn(pctldev->dev,
|
|
"not freeing pin %d (%s) as part of "
|
|
"deactivating group %s - it is already "
|
|
"used for some other setting",
|
|
pins[i], desc->name, gname);
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
/* Called from pincontrol core */
|
|
static int pinmux_functions_show(struct seq_file *s, void *what)
|
|
{
|
|
struct pinctrl_dev *pctldev = s->private;
|
|
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
|
|
unsigned nfuncs;
|
|
unsigned func_selector = 0;
|
|
|
|
if (!pmxops)
|
|
return 0;
|
|
|
|
mutex_lock(&pctldev->mutex);
|
|
nfuncs = pmxops->get_functions_count(pctldev);
|
|
while (func_selector < nfuncs) {
|
|
const char *func = pmxops->get_function_name(pctldev,
|
|
func_selector);
|
|
const char * const *groups;
|
|
unsigned num_groups;
|
|
int ret;
|
|
int i;
|
|
|
|
ret = pmxops->get_function_groups(pctldev, func_selector,
|
|
&groups, &num_groups);
|
|
if (ret)
|
|
seq_printf(s, "function %s: COULD NOT GET GROUPS\n",
|
|
func);
|
|
|
|
seq_printf(s, "function: %s, groups = [ ", func);
|
|
for (i = 0; i < num_groups; i++)
|
|
seq_printf(s, "%s ", groups[i]);
|
|
seq_puts(s, "]\n");
|
|
|
|
func_selector++;
|
|
}
|
|
|
|
mutex_unlock(&pctldev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pinmux_pins_show(struct seq_file *s, void *what)
|
|
{
|
|
struct pinctrl_dev *pctldev = s->private;
|
|
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
|
|
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
|
|
unsigned i, pin;
|
|
|
|
if (!pmxops)
|
|
return 0;
|
|
|
|
seq_puts(s, "Pinmux settings per pin\n");
|
|
seq_puts(s, "Format: pin (name): mux_owner gpio_owner hog?\n");
|
|
|
|
mutex_lock(&pctldev->mutex);
|
|
|
|
/* The pin number can be retrived from the pin controller descriptor */
|
|
for (i = 0; i < pctldev->desc->npins; i++) {
|
|
struct pin_desc *desc;
|
|
bool is_hog = false;
|
|
|
|
pin = pctldev->desc->pins[i].number;
|
|
desc = pin_desc_get(pctldev, pin);
|
|
/* Skip if we cannot search the pin */
|
|
if (desc == NULL)
|
|
continue;
|
|
|
|
if (desc->mux_owner &&
|
|
!strcmp(desc->mux_owner, pinctrl_dev_get_name(pctldev)))
|
|
is_hog = true;
|
|
|
|
seq_printf(s, "pin %d (%s): %s %s%s", pin,
|
|
desc->name ? desc->name : "unnamed",
|
|
desc->mux_owner ? desc->mux_owner
|
|
: "(MUX UNCLAIMED)",
|
|
desc->gpio_owner ? desc->gpio_owner
|
|
: "(GPIO UNCLAIMED)",
|
|
is_hog ? " (HOG)" : "");
|
|
|
|
if (desc->mux_setting)
|
|
seq_printf(s, " function %s group %s\n",
|
|
pmxops->get_function_name(pctldev,
|
|
desc->mux_setting->func),
|
|
pctlops->get_group_name(pctldev,
|
|
desc->mux_setting->group));
|
|
else
|
|
seq_printf(s, "\n");
|
|
}
|
|
|
|
mutex_unlock(&pctldev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void pinmux_show_map(struct seq_file *s, struct pinctrl_map const *map)
|
|
{
|
|
seq_printf(s, "group %s\nfunction %s\n",
|
|
map->data.mux.group ? map->data.mux.group : "(default)",
|
|
map->data.mux.function);
|
|
}
|
|
|
|
void pinmux_show_setting(struct seq_file *s,
|
|
struct pinctrl_setting const *setting)
|
|
{
|
|
struct pinctrl_dev *pctldev = setting->pctldev;
|
|
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
|
|
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
|
|
|
|
seq_printf(s, "group: %s (%u) function: %s (%u)\n",
|
|
pctlops->get_group_name(pctldev, setting->data.mux.group),
|
|
setting->data.mux.group,
|
|
pmxops->get_function_name(pctldev, setting->data.mux.func),
|
|
setting->data.mux.func);
|
|
}
|
|
|
|
static int pinmux_functions_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, pinmux_functions_show, inode->i_private);
|
|
}
|
|
|
|
static int pinmux_pins_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, pinmux_pins_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations pinmux_functions_ops = {
|
|
.open = pinmux_functions_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static const struct file_operations pinmux_pins_ops = {
|
|
.open = pinmux_pins_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
void pinmux_init_device_debugfs(struct dentry *devroot,
|
|
struct pinctrl_dev *pctldev)
|
|
{
|
|
debugfs_create_file("pinmux-functions", S_IFREG | S_IRUGO,
|
|
devroot, pctldev, &pinmux_functions_ops);
|
|
debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO,
|
|
devroot, pctldev, &pinmux_pins_ops);
|
|
}
|
|
|
|
#endif /* CONFIG_DEBUG_FS */
|