drivers: Add a new framework for multiplexer devices
Add a new subsystem that handles multiplexer controllers. The API is the
same as in Linux.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
[trini: Update some error calls to use different functions or pass
correct arguments]
Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Jean-Jacques Hiblot
Tom Rini
parent
39dd7c1d6b
commit
0ad40b2463
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@ -64,6 +64,8 @@ source "drivers/mmc/Kconfig"
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source "drivers/mtd/Kconfig"
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source "drivers/mux/Kconfig"
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source "drivers/net/Kconfig"
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source "drivers/nvme/Kconfig"
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@ -14,6 +14,7 @@ obj-$(CONFIG_$(SPL_TPL_)INPUT) += input/
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obj-$(CONFIG_$(SPL_TPL_)LED) += led/
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obj-$(CONFIG_$(SPL_TPL_)MMC_SUPPORT) += mmc/
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obj-y += mtd/
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obj-$(CONFIG_$(SPL_)MULTIPLEXER) += mux/
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obj-$(CONFIG_$(SPL_TPL_)PCH_SUPPORT) += pch/
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obj-$(CONFIG_$(SPL_TPL_)PCI) += pci/
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obj-$(CONFIG_$(SPL_TPL_)PHY) += phy/
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@ -0,0 +1,11 @@
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menu "Multiplexer drivers"
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config MULTIPLEXER
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bool "Multiplexer Support"
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depends on DM
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help
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The mux framework is a minimalistic subsystem that handles multiplexer
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controllers. It provides the same API as Linux and mux drivers should
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be portable with a minimum effort.
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endmenu
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@ -0,0 +1,6 @@
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# SPDX-License-Identifier: GPL-2.0+
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#
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# (C) Copyright 2019
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# Jean-Jacques Hiblot <jjhiblot@ti.com>
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obj-$(CONFIG_$(SPL_)MULTIPLEXER) += mux-uclass.o
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@ -0,0 +1,312 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Multiplexer subsystem
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*
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* Based on the linux multiplexer framework
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*
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* Copyright (C) 2017 Axentia Technologies AB
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* Author: Peter Rosin <peda@axentia.se>
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*
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* Copyright (C) 2017-2018 Texas Instruments Incorporated - http://www.ti.com/
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* Jean-Jacques Hiblot <jjhiblot@ti.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <mux-internal.h>
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#include <dm/device-internal.h>
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#include <dm/device_compat.h>
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#include <dm/devres.h>
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#include <dt-bindings/mux/mux.h>
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#include <linux/bug.h>
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/*
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* The idle-as-is "state" is not an actual state that may be selected, it
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* only implies that the state should not be changed. So, use that state
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* as indication that the cached state of the multiplexer is unknown.
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*/
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#define MUX_CACHE_UNKNOWN MUX_IDLE_AS_IS
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/**
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* mux_control_ops() - Get the mux_control ops.
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* @dev: The client device.
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*
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* Return: A pointer to the 'mux_control_ops' of the device.
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*/
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static inline const struct mux_control_ops *mux_dev_ops(struct udevice *dev)
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{
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return (const struct mux_control_ops *)dev->driver->ops;
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}
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/**
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* mux_control_set() - Set the state of the given mux controller.
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* @mux: A multiplexer control
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* @state: The new requested state.
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*
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* Return: 0 if OK, or a negative error code.
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*/
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static int mux_control_set(struct mux_control *mux, int state)
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{
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int ret = mux_dev_ops(mux->dev)->set(mux, state);
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mux->cached_state = ret < 0 ? MUX_CACHE_UNKNOWN : state;
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return ret;
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}
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unsigned int mux_control_states(struct mux_control *mux)
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{
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return mux->states;
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}
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/**
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* __mux_control_select() - Select the given multiplexer state.
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* @mux: The mux-control to request a change of state from.
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* @state: The new requested state.
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*
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* Try to set the mux to the requested state. If not, try to revert if
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* appropriate.
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*/
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static int __mux_control_select(struct mux_control *mux, int state)
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{
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int ret;
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if (WARN_ON(state < 0 || state >= mux->states))
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return -EINVAL;
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if (mux->cached_state == state)
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return 0;
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ret = mux_control_set(mux, state);
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if (ret >= 0)
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return 0;
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/* The mux update failed, try to revert if appropriate... */
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if (mux->idle_state != MUX_IDLE_AS_IS)
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mux_control_set(mux, mux->idle_state);
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return ret;
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}
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int mux_control_select(struct mux_control *mux, unsigned int state)
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{
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int ret;
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if (mux->in_use)
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return -EBUSY;
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ret = __mux_control_select(mux, state);
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if (ret < 0)
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return ret;
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mux->in_use = true;
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return 0;
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}
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int mux_control_deselect(struct mux_control *mux)
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{
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int ret = 0;
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if (mux->idle_state != MUX_IDLE_AS_IS &&
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mux->idle_state != mux->cached_state)
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ret = mux_control_set(mux, mux->idle_state);
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mux->in_use = false;
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return ret;
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}
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static int mux_of_xlate_default(struct mux_chip *mux_chip,
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struct ofnode_phandle_args *args,
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struct mux_control **muxp)
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{
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struct mux_control *mux;
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int id;
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log_debug("%s(muxp=%p)\n", __func__, muxp);
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if (args->args_count > 1) {
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debug("Invaild args_count: %d\n", args->args_count);
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return -EINVAL;
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}
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if (args->args_count)
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id = args->args[0];
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else
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id = 0;
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if (id >= mux_chip->controllers) {
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pr_err("bad mux controller %u specified in %s\n",
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id, ofnode_get_name(args->node));
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return -ERANGE;
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}
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mux = &mux_chip->mux[id];
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mux->id = id;
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*muxp = mux;
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return 0;
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}
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/**
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* mux_get_by_indexed_prop() - Get a mux control by integer index
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* @dev: The client device.
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* @prop_name: Name of the device tree property.
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* @index: The index of the mux to get
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* @mux: A pointer to the 'mux_control' struct to initialize.
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*
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* Return: 0 of OK, -errno otherwise.
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*/
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static int mux_get_by_indexed_prop(struct udevice *dev, const char *prop_name,
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int index, struct mux_control **mux)
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{
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int ret;
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struct ofnode_phandle_args args;
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struct udevice *dev_mux;
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const struct mux_control_ops *ops;
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struct mux_chip *mux_chip;
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log_debug("%s(dev=%p, index=%d, mux=%p)\n", __func__, dev, index, mux);
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ret = dev_read_phandle_with_args(dev, prop_name, "#mux-control-cells",
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0, index, &args);
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if (ret) {
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debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
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__func__, ret);
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return ret;
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}
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ret = uclass_get_device_by_ofnode(UCLASS_MUX, args.node, &dev_mux);
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if (ret) {
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debug("%s: uclass_get_device_by_ofnode failed: err=%d\n",
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__func__, ret);
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return ret;
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}
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mux_chip = dev_get_uclass_priv(dev_mux);
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ops = mux_dev_ops(dev_mux);
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if (ops->of_xlate)
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ret = ops->of_xlate(mux_chip, &args, mux);
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else
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ret = mux_of_xlate_default(mux_chip, &args, mux);
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if (ret) {
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debug("of_xlate() failed: %d\n", ret);
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return ret;
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}
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(*mux)->dev = dev_mux;
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return 0;
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}
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int mux_get_by_index(struct udevice *dev, int index, struct mux_control **mux)
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{
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return mux_get_by_indexed_prop(dev, "mux-controls", index, mux);
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}
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int mux_control_get(struct udevice *dev, const char *name,
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struct mux_control **mux)
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{
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int index;
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debug("%s(dev=%p, name=%s, mux=%p)\n", __func__, dev, name, mux);
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index = dev_read_stringlist_search(dev, "mux-control-names", name);
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if (index < 0) {
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debug("fdt_stringlist_search() failed: %d\n", index);
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return index;
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}
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return mux_get_by_index(dev, index, mux);
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}
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void mux_control_put(struct mux_control *mux)
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{
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mux_control_deselect(mux);
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}
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/**
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* devm_mux_control_release() - Release the given managed mux.
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* @dev: The client device.
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* @res: Pointer to the mux to be released.
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*
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* This function is called by devres to release the mux. It reverses the
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* effects of mux_control_get().
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*/
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static void devm_mux_control_release(struct udevice *dev, void *res)
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{
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mux_control_put(*(struct mux_control **)res);
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}
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struct mux_control *devm_mux_control_get(struct udevice *dev, const char *id)
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{
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int rc;
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struct mux_control **mux;
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mux = devres_alloc(devm_mux_control_release,
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sizeof(struct mux_control *), __GFP_ZERO);
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if (unlikely(!mux))
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return ERR_PTR(-ENOMEM);
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rc = mux_control_get(dev, id, mux);
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if (rc)
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return ERR_PTR(rc);
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devres_add(dev, mux);
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return *mux;
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}
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int mux_alloc_controllers(struct udevice *dev, unsigned int controllers)
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{
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int i;
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struct mux_chip *mux_chip = dev_get_uclass_priv(dev);
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mux_chip->mux = devm_kmalloc(dev,
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sizeof(struct mux_control) * controllers,
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__GFP_ZERO);
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if (!mux_chip->mux)
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return -ENOMEM;
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mux_chip->controllers = controllers;
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for (i = 0; i < mux_chip->controllers; ++i) {
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struct mux_control *mux = &mux_chip->mux[i];
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mux->dev = dev;
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mux->cached_state = MUX_CACHE_UNKNOWN;
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mux->idle_state = MUX_IDLE_AS_IS;
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mux->in_use = false;
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mux->id = i;
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}
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return 0;
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}
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static int mux_uclass_post_probe(struct udevice *dev)
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{
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int i, ret;
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struct mux_chip *mux_chip = dev_get_uclass_priv(dev);
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/* Set all mux controllers to their idle state. */
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for (i = 0; i < mux_chip->controllers; ++i) {
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struct mux_control *mux = &mux_chip->mux[i];
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if (mux->idle_state == mux->cached_state)
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continue;
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ret = mux_control_set(mux, mux->idle_state);
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if (ret < 0) {
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dev_err(dev, "unable to set idle state\n");
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return ret;
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}
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}
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return 0;
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}
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UCLASS_DRIVER(mux) = {
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.id = UCLASS_MUX,
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.name = "mux",
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.post_probe = mux_uclass_post_probe,
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.per_device_auto_alloc_size = sizeof(struct mux_chip),
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};
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@ -71,6 +71,7 @@ enum uclass_id {
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UCLASS_MMC, /* SD / MMC card or chip */
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UCLASS_MOD_EXP, /* RSA Mod Exp device */
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UCLASS_MTD, /* Memory Technology Device (MTD) device */
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UCLASS_MUX, /* Multiplexer device */
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UCLASS_NOP, /* No-op devices */
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UCLASS_NORTHBRIDGE, /* Intel Northbridge / SDRAM controller */
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UCLASS_NVME, /* NVM Express device */
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@ -0,0 +1,17 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* This header provides constants for most Multiplexer bindings.
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*
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* Most Multiplexer bindings specify an idle state. In most cases, the
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* the multiplexer can be left as is when idle, and in some cases it can
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* disconnect the input/output and leave the multiplexer in a high
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* impedance state.
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*/
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#ifndef _DT_BINDINGS_MUX_MUX_H
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#define _DT_BINDINGS_MUX_MUX_H
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#define MUX_IDLE_AS_IS (-1)
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#define MUX_IDLE_DISCONNECT (-2)
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#endif
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@ -0,0 +1,109 @@
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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Based on the linux multiplexer framework
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*
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* Copyright (C) 2017 Axentia Technologies AB
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* Author: Peter Rosin <peda@axentia.se>
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*
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* Copyright (C) 2017-2018 Texas Instruments Incorporated - http://www.ti.com/
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* Jean-Jacques Hiblot <jjhiblot@ti.com>
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*/
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#ifndef _MUX_INTERNAL_H
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#define _MUX_INTERNAL_H
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/* See mux.h for background documentation. */
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struct ofnode_phandle_args;
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/**
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* struct mux_chip - Represents a chip holding mux controllers.
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* @controllers: Number of mux controllers handled by the chip.
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* @mux: Array of mux controllers that are handled.
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*
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* This a per-device uclass-private data.
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*/
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struct mux_chip {
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unsigned int controllers;
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struct mux_control *mux;
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};
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/**
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* struct mux_control_ops - Mux controller operations for a mux chip.
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* @set: Set the state of the given mux controller.
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*/
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struct mux_control_ops {
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/**
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* set - Apply a state to a multiplexer control
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*
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* @mux: A multiplexer control
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* @return 0 if OK, or a negative error code.
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*/
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int (*set)(struct mux_control *mux, int state);
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/**
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* of_xlate - Translate a client's device-tree (OF) multiplexer
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* specifier.
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*
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* If this function pointer is set to NULL, the multiplexer core will
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* use a default implementation, which assumes #mux-control-cells = <1>
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* and that the DT cell contains a simple integer channel ID.
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*
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* @dev_mux: The multiplexer device. A single device may handle
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* several multiplexer controls.
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* @args: The multiplexer specifier values from device tree.
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* @muxp: (out) A multiplexer control
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* @return 0 if OK, or a negative error code.
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*/
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int (*of_xlate)(struct mux_chip *dev_mux,
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struct ofnode_phandle_args *args,
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struct mux_control **muxp);
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};
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/**
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* struct mux_control - Represents a mux controller.
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* @in_use: Whether the mux controller is in use or not.
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* @dev: The client device.
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* @cached_state: The current mux controller state, or -1 if none.
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* @states: The number of mux controller states.
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* @idle_state: The mux controller state to use when inactive, or one
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* of MUX_IDLE_AS_IS and MUX_IDLE_DISCONNECT.
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* @id: The index of the mux controller within the mux chip
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* it is a part of.
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*
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* Mux drivers may only change @states and @idle_state, and may only do so
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* between allocation and registration of the mux controller. Specifically,
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* @cached_state is internal to the mux core and should never be written by
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* mux drivers.
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*/
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struct mux_control {
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bool in_use;
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struct udevice *dev;
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int cached_state;
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unsigned int states;
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int idle_state;
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int id;
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};
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/**
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* mux_control_get_index() - Get the index of the given mux controller
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* @mux: The mux-control to get the index for.
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*
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* Return: The index of the mux controller within the mux chip the mux
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* controller is a part of.
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*/
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static inline unsigned int mux_control_get_index(struct mux_control *mux)
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{
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return mux->id;
|
||||
}
|
||||
|
||||
/**
|
||||
* mux_alloc_controllers() - Allocate the given number of mux controllers.
|
||||
* @dev: The client device.
|
||||
* controllers: Number of controllers to allocate.
|
||||
*
|
||||
* Return: 0 of OK, -errno otherwise.
|
||||
*/
|
||||
int mux_alloc_controllers(struct udevice *dev, unsigned int controllers);
|
||||
|
||||
#endif
|
||||
|
|
@ -0,0 +1,147 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0+ */
|
||||
/*
|
||||
* Based on the linux multiplexer framework
|
||||
*
|
||||
* At its core, a multiplexer (or mux), also known as a data selector, is a
|
||||
* device that selects between several analog or digital input signals and
|
||||
* forwards it to a single output line. This notion can be extended to work
|
||||
* with buses, like a I2C bus multiplexer for example.
|
||||
*
|
||||
* Copyright (C) 2017 Axentia Technologies AB
|
||||
* Author: Peter Rosin <peda@axentia.se>
|
||||
*
|
||||
* Copyright (C) 2017-2018 Texas Instruments Incorporated - http://www.ti.com/
|
||||
* Jean-Jacques Hiblot <jjhiblot@ti.com>
|
||||
*/
|
||||
|
||||
#ifndef _MUX_H_
|
||||
#define _MUX_H_
|
||||
|
||||
#include <linux/errno.h>
|
||||
#include <linux/types.h>
|
||||
|
||||
struct udevice;
|
||||
struct mux_control;
|
||||
|
||||
#if CONFIG_IS_ENABLED(MULTIPLEXER)
|
||||
/**
|
||||
* mux_control_states() - Query the number of multiplexer states.
|
||||
* @mux: The mux-control to query.
|
||||
*
|
||||
* Return: The number of multiplexer states.
|
||||
*/
|
||||
unsigned int mux_control_states(struct mux_control *mux);
|
||||
|
||||
/**
|
||||
* mux_control_select() - Select the given multiplexer state.
|
||||
* @mux: The mux-control to request a change of state from.
|
||||
* @state: The new requested state.
|
||||
*
|
||||
* On successfully selecting the mux-control state, it will be locked until
|
||||
* there is a call to mux_control_deselect(). If the mux-control is already
|
||||
* selected when mux_control_select() is called, the function will indicate
|
||||
* -EBUSY
|
||||
*
|
||||
* Therefore, make sure to call mux_control_deselect() when the operation is
|
||||
* complete and the mux-control is free for others to use, but do not call
|
||||
* mux_control_deselect() if mux_control_select() fails.
|
||||
*
|
||||
* Return: 0 when the mux-control state has the requested state or a negative
|
||||
* errno on error.
|
||||
*/
|
||||
int __must_check mux_control_select(struct mux_control *mux,
|
||||
unsigned int state);
|
||||
#define mux_control_try_select(mux) mux_control_select(mux)
|
||||
|
||||
/**
|
||||
* mux_control_deselect() - Deselect the previously selected multiplexer state.
|
||||
* @mux: The mux-control to deselect.
|
||||
*
|
||||
* It is required that a single call is made to mux_control_deselect() for
|
||||
* each and every successful call made to either of mux_control_select() or
|
||||
* mux_control_try_select().
|
||||
*
|
||||
* Return: 0 on success and a negative errno on error. An error can only
|
||||
* occur if the mux has an idle state. Note that even if an error occurs, the
|
||||
* mux-control is unlocked and is thus free for the next access.
|
||||
*/
|
||||
int mux_control_deselect(struct mux_control *mux);
|
||||
|
||||
/**
|
||||
* mux_get_by_index() = Get a mux by integer index.
|
||||
* @dev: The client device.
|
||||
* @index: The index of the mux to get.
|
||||
* @mux: A pointer to the 'mux_control' struct to initialize.
|
||||
*
|
||||
* This looks up and initializes a mux. The index is relative to the client
|
||||
* device.
|
||||
*
|
||||
* Return: 0 if OK, or a negative error code.
|
||||
*/
|
||||
int mux_get_by_index(struct udevice *dev, int index, struct mux_control **mux);
|
||||
|
||||
/**
|
||||
* mux_control_get() - Get the mux-control for a device.
|
||||
* @dev: The device that needs a mux-control.
|
||||
* @mux_name: The name identifying the mux-control.
|
||||
* @mux: A pointer to the mux-control pointer.
|
||||
*
|
||||
* Return: 0 of OK, or a negative error code.
|
||||
*/
|
||||
int mux_control_get(struct udevice *dev, const char *name,
|
||||
struct mux_control **mux);
|
||||
|
||||
/**
|
||||
* mux_control_put() - Put away the mux-control for good.
|
||||
* @mux: The mux-control to put away.
|
||||
*
|
||||
* mux_control_put() reverses the effects of mux_control_get().
|
||||
*/
|
||||
void mux_control_put(struct mux_control *mux);
|
||||
|
||||
/**
|
||||
* devm_mux_control_get() - Get the mux-control for a device, with resource
|
||||
* management.
|
||||
* @dev: The device that needs a mux-control.
|
||||
* @mux_name: The name identifying the mux-control.
|
||||
*
|
||||
* Return: Pointer to the mux-control, or an ERR_PTR with a negative errno.
|
||||
*/
|
||||
struct mux_control *devm_mux_control_get(struct udevice *dev,
|
||||
const char *mux_name);
|
||||
#else
|
||||
unsigned int mux_control_states(struct mux_control *mux)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
int __must_check mux_control_select(struct mux_control *mux,
|
||||
unsigned int state)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
#define mux_control_try_select(mux) mux_control_select(mux)
|
||||
|
||||
int mux_control_deselect(struct mux_control *mux)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
struct mux_control *mux_control_get(struct udevice *dev, const char *mux_name)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
void mux_control_put(struct mux_control *mux)
|
||||
{
|
||||
}
|
||||
|
||||
struct mux_control *devm_mux_control_get(struct udevice *dev,
|
||||
const char *mux_name)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue