pinctrl: Add core support for Aspeed SoCs
The Aspeed SoCs typically provide more than 200 pins for GPIO and other functions. The signal enabled on a pin is determined on a priority basis, where a given pin can provide a number of different signal types. In addition to the priority levels, the Aspeed pin controllers describe the signal active on a pin by compound logical expressions involving multiple operators, registers and bits. Some difficulty arises as a pin's function bit masks for each priority level are frequently not the same (i.e. we cannot just flip a bit to change from a high to low priority signal), or even in the same register(s). Some configuration bits affect multiple pins, while in other cases the signals for a bus must each be enabled individually. Together, these features give rise to some complexity in the implementation. A more complete description of the complexities is provided in the associated header file. The patch doesn't implement pinctrl/pinmux/pinconf for any particular Aspeed SoC, rather it adds the framework for defining pinmux configurations. Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Reviewed-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andrew Jeffery
Linus Walleij
parent
5f714700b1
commit
4d3d0e4272
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@ -254,6 +254,7 @@ config PINCTRL_ZYNQ
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help
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This selects the pinctrl driver for Xilinx Zynq.
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source "drivers/pinctrl/aspeed/Kconfig"
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source "drivers/pinctrl/bcm/Kconfig"
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source "drivers/pinctrl/berlin/Kconfig"
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source "drivers/pinctrl/freescale/Kconfig"
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@ -37,6 +37,7 @@ obj-$(CONFIG_PINCTRL_TB10X) += pinctrl-tb10x.o
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obj-$(CONFIG_PINCTRL_ST) += pinctrl-st.o
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obj-$(CONFIG_PINCTRL_ZYNQ) += pinctrl-zynq.o
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obj-$(CONFIG_ARCH_ASPEED) += aspeed/
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obj-y += bcm/
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obj-$(CONFIG_PINCTRL_BERLIN) += berlin/
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obj-y += freescale/
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@ -0,0 +1,8 @@
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config PINCTRL_ASPEED
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bool
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depends on (ARCH_ASPEED || COMPILE_TEST) && OF
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depends on MFD_SYSCON
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select PINMUX
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select PINCONF
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select GENERIC_PINCONF
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select REGMAP_MMIO
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@ -0,0 +1,4 @@
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# Aspeed pinctrl support
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ccflags-y += -Woverride-init
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obj-$(CONFIG_PINCTRL_ASPEED) += pinctrl-aspeed.o
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@ -0,0 +1,498 @@
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/*
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* Copyright (C) 2016 IBM Corp.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/mfd/syscon.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include "../core.h"
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#include "pinctrl-aspeed.h"
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int aspeed_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
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{
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struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
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return pdata->ngroups;
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}
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const char *aspeed_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
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unsigned int group)
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{
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struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
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return pdata->groups[group].name;
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}
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int aspeed_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
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unsigned int group, const unsigned int **pins,
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unsigned int *npins)
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{
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struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
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*pins = &pdata->groups[group].pins[0];
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*npins = pdata->groups[group].npins;
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return 0;
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}
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void aspeed_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
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struct seq_file *s, unsigned int offset)
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{
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seq_printf(s, " %s", dev_name(pctldev->dev));
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}
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int aspeed_pinmux_get_fn_count(struct pinctrl_dev *pctldev)
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{
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struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
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return pdata->nfunctions;
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}
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const char *aspeed_pinmux_get_fn_name(struct pinctrl_dev *pctldev,
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unsigned int function)
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{
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struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
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return pdata->functions[function].name;
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}
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int aspeed_pinmux_get_fn_groups(struct pinctrl_dev *pctldev,
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unsigned int function,
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const char * const **groups,
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unsigned int * const num_groups)
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{
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struct aspeed_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
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*groups = pdata->functions[function].groups;
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*num_groups = pdata->functions[function].ngroups;
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return 0;
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}
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static inline void aspeed_sig_desc_print_val(
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const struct aspeed_sig_desc *desc, bool enable, u32 rv)
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{
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pr_debug("SCU%x[0x%08x]=0x%x, got 0x%x from 0x%08x\n", desc->reg,
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desc->mask, enable ? desc->enable : desc->disable,
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(rv & desc->mask) >> __ffs(desc->mask), rv);
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}
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/**
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* Query the enabled or disabled state of a signal descriptor
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*
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* @desc: The signal descriptor of interest
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* @enabled: True to query the enabled state, false to query disabled state
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* @regmap: The SCU regmap instance
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*
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* @return True if the descriptor's bitfield is configured to the state
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* selected by @enabled, false otherwise
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*
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* Evaluation of descriptor state is non-trivial in that it is not a binary
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* outcome: The bitfields can be greater than one bit in size and thus can take
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* a value that is neither the enabled nor disabled state recorded in the
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* descriptor (typically this means a different function to the one of interest
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* is enabled). Thus we must explicitly test for either condition as required.
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*/
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static bool aspeed_sig_desc_eval(const struct aspeed_sig_desc *desc,
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bool enabled, struct regmap *map)
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{
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unsigned int raw;
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u32 want;
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if (regmap_read(map, desc->reg, &raw) < 0)
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return false;
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aspeed_sig_desc_print_val(desc, enabled, raw);
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want = enabled ? desc->enable : desc->disable;
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return ((raw & desc->mask) >> __ffs(desc->mask)) == want;
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}
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/**
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* Query the enabled or disabled state for a mux function's signal on a pin
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*
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* @expr: An expression controlling the signal for a mux function on a pin
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* @enabled: True to query the enabled state, false to query disabled state
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* @regmap: The SCU regmap instance
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*
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* @return True if the expression composed by @enabled evaluates true, false
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* otherwise
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*
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* A mux function is enabled or disabled if the function's signal expression
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* for each pin in the function's pin group evaluates true for the desired
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* state. An signal expression evaluates true if all of its associated signal
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* descriptors evaluate true for the desired state.
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*
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* If an expression's state is described by more than one bit, either through
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* multi-bit bitfields in a single signal descriptor or through multiple signal
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* descriptors of a single bit then it is possible for the expression to be in
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* neither the enabled nor disabled state. Thus we must explicitly test for
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* either condition as required.
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*/
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static bool aspeed_sig_expr_eval(const struct aspeed_sig_expr *expr,
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bool enabled, struct regmap *map)
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{
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int i;
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for (i = 0; i < expr->ndescs; i++) {
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const struct aspeed_sig_desc *desc = &expr->descs[i];
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if (!aspeed_sig_desc_eval(desc, enabled, map))
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return false;
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}
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return true;
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}
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/**
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* Configure a pin's signal by applying an expression's descriptor state for
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* all descriptors in the expression.
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*
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* @expr: The expression associated with the function whose signal is to be
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* configured
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* @enable: true to enable an function's signal through a pin's signal
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* expression, false to disable the function's signal
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* @map: The SCU's regmap instance for pinmux register access.
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*
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* @return true if the expression is configured as requested, false otherwise
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*/
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static bool aspeed_sig_expr_set(const struct aspeed_sig_expr *expr,
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bool enable, struct regmap *map)
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{
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int i;
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bool ret;
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ret = aspeed_sig_expr_eval(expr, enable, map);
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if (ret)
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return ret;
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for (i = 0; i < expr->ndescs; i++) {
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const struct aspeed_sig_desc *desc = &expr->descs[i];
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u32 pattern = enable ? desc->enable : desc->disable;
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/*
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* Strap registers are configured in hardware or by early-boot
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* firmware. Treat them as read-only despite that we can write
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* them. This may mean that certain functions cannot be
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* deconfigured and is the reason we re-evaluate after writing
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* all descriptor bits.
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*/
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if (desc->reg == HW_STRAP1 || desc->reg == HW_STRAP2)
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continue;
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ret = regmap_update_bits(map, desc->reg, desc->mask,
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pattern << __ffs(desc->mask));
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if (ret < 0)
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return false;
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}
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return aspeed_sig_expr_eval(expr, enable, map);
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}
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static bool aspeed_sig_expr_enable(const struct aspeed_sig_expr *expr,
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struct regmap *map)
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{
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return aspeed_sig_expr_set(expr, true, map);
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}
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static bool aspeed_sig_expr_disable(const struct aspeed_sig_expr *expr,
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struct regmap *map)
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{
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return aspeed_sig_expr_set(expr, false, map);
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}
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/**
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* Disable a signal on a pin by disabling all provided signal expressions.
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*
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* @exprs: The list of signal expressions (from a priority level on a pin)
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* @map: The SCU's regmap instance for pinmux register access.
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*
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* @return true if all expressions in the list are successfully disabled, false
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* otherwise
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*/
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static bool aspeed_disable_sig(const struct aspeed_sig_expr **exprs,
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struct regmap *map)
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{
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bool disabled = true;
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if (!exprs)
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return true;
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while (*exprs) {
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bool ret;
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ret = aspeed_sig_expr_disable(*exprs, map);
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disabled = disabled && ret;
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exprs++;
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}
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return disabled;
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}
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/**
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* Search for the signal expression needed to enable the pin's signal for the
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* requested function.
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*
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* @exprs: List of signal expressions (haystack)
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* @name: The name of the requested function (needle)
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*
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* @return A pointer to the signal expression whose function tag matches the
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* provided name, otherwise NULL.
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*
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*/
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static const struct aspeed_sig_expr *aspeed_find_expr_by_name(
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const struct aspeed_sig_expr **exprs, const char *name)
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{
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while (*exprs) {
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if (strcmp((*exprs)->function, name) == 0)
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return *exprs;
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exprs++;
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}
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return NULL;
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}
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static char *get_defined_attribute(const struct aspeed_pin_desc *pdesc,
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const char *(*get)(
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const struct aspeed_sig_expr *))
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{
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char *found = NULL;
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size_t len = 0;
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const struct aspeed_sig_expr ***prios, **funcs, *expr;
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prios = pdesc->prios;
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while ((funcs = *prios)) {
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while ((expr = *funcs)) {
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const char *str = get(expr);
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size_t delta = strlen(str) + 2;
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char *expanded;
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expanded = krealloc(found, len + delta + 1, GFP_KERNEL);
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if (!expanded) {
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kfree(found);
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return expanded;
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}
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found = expanded;
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found[len] = '\0';
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len += delta;
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strcat(found, str);
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strcat(found, ", ");
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funcs++;
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}
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prios++;
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}
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if (len < 2) {
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kfree(found);
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return NULL;
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}
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found[len - 2] = '\0';
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return found;
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}
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static const char *aspeed_sig_expr_function(const struct aspeed_sig_expr *expr)
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{
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return expr->function;
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}
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static char *get_defined_functions(const struct aspeed_pin_desc *pdesc)
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{
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return get_defined_attribute(pdesc, aspeed_sig_expr_function);
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}
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static const char *aspeed_sig_expr_signal(const struct aspeed_sig_expr *expr)
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{
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return expr->signal;
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}
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static char *get_defined_signals(const struct aspeed_pin_desc *pdesc)
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{
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return get_defined_attribute(pdesc, aspeed_sig_expr_signal);
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}
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int aspeed_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned int function,
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unsigned int group)
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{
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int i;
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const struct aspeed_pinctrl_data *pdata =
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pinctrl_dev_get_drvdata(pctldev);
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const struct aspeed_pin_group *pgroup = &pdata->groups[group];
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const struct aspeed_pin_function *pfunc =
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&pdata->functions[function];
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for (i = 0; i < pgroup->npins; i++) {
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int pin = pgroup->pins[i];
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const struct aspeed_pin_desc *pdesc = pdata->pins[pin].drv_data;
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const struct aspeed_sig_expr *expr = NULL;
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const struct aspeed_sig_expr **funcs;
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const struct aspeed_sig_expr ***prios;
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if (!pdesc)
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return -EINVAL;
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prios = pdesc->prios;
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if (!prios)
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continue;
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/* Disable functions at a higher priority than that requested */
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while ((funcs = *prios)) {
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expr = aspeed_find_expr_by_name(funcs, pfunc->name);
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if (expr)
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break;
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if (!aspeed_disable_sig(funcs, pdata->map))
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return -EPERM;
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prios++;
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}
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if (!expr) {
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char *functions = get_defined_functions(pdesc);
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char *signals = get_defined_signals(pdesc);
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pr_warn("No function %s found on pin %s (%d). Found signal(s) %s for function(s) %s\n",
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pfunc->name, pdesc->name, pin, signals,
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functions);
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kfree(signals);
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kfree(functions);
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return -ENXIO;
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}
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if (!aspeed_sig_expr_enable(expr, pdata->map))
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return -EPERM;
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}
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return 0;
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}
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static bool aspeed_expr_is_gpio(const struct aspeed_sig_expr *expr)
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{
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/*
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* The signal type is GPIO if the signal name has "GPIO" as a prefix.
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* strncmp (rather than strcmp) is used to implement the prefix
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* requirement.
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*
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* expr->signal might look like "GPIOT3" in the GPIO case.
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*/
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return strncmp(expr->signal, "GPIO", 4) == 0;
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}
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static bool aspeed_gpio_in_exprs(const struct aspeed_sig_expr **exprs)
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{
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if (!exprs)
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return false;
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while (*exprs) {
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if (aspeed_expr_is_gpio(*exprs))
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return true;
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exprs++;
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}
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return false;
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}
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int aspeed_gpio_request_enable(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned int offset)
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{
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const struct aspeed_pinctrl_data *pdata =
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pinctrl_dev_get_drvdata(pctldev);
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const struct aspeed_pin_desc *pdesc = pdata->pins[offset].drv_data;
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const struct aspeed_sig_expr ***prios, **funcs, *expr;
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if (!pdesc)
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return -EINVAL;
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prios = pdesc->prios;
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if (!prios)
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return -ENXIO;
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/* Disable any functions of higher priority than GPIO */
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while ((funcs = *prios)) {
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if (aspeed_gpio_in_exprs(funcs))
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break;
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if (!aspeed_disable_sig(funcs, pdata->map))
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return -EPERM;
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prios++;
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}
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if (!funcs) {
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char *signals = get_defined_signals(pdesc);
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pr_warn("No GPIO signal type found on pin %s (%d). Found: %s\n",
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pdesc->name, offset, signals);
|
||||
kfree(signals);
|
||||
|
||||
return -ENXIO;
|
||||
}
|
||||
|
||||
expr = *funcs;
|
||||
|
||||
/*
|
||||
* Disabling all higher-priority expressions is enough to enable the
|
||||
* lowest-priority signal type. As such it has no associated
|
||||
* expression.
|
||||
*/
|
||||
if (!expr)
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* If GPIO is not the lowest priority signal type, assume there is only
|
||||
* one expression defined to enable the GPIO function
|
||||
*/
|
||||
if (!aspeed_sig_expr_enable(expr, pdata->map))
|
||||
return -EPERM;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int aspeed_pinctrl_probe(struct platform_device *pdev,
|
||||
struct pinctrl_desc *pdesc,
|
||||
struct aspeed_pinctrl_data *pdata)
|
||||
{
|
||||
struct device *parent;
|
||||
struct pinctrl_dev *pctl;
|
||||
|
||||
parent = pdev->dev.parent;
|
||||
if (!parent) {
|
||||
dev_err(&pdev->dev, "No parent for syscon pincontroller\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
pdata->map = syscon_node_to_regmap(parent->of_node);
|
||||
if (IS_ERR(pdata->map)) {
|
||||
dev_err(&pdev->dev, "No regmap for syscon pincontroller parent\n");
|
||||
return PTR_ERR(pdata->map);
|
||||
}
|
||||
|
||||
pctl = pinctrl_register(pdesc, &pdev->dev, pdata);
|
||||
|
||||
if (IS_ERR(pctl)) {
|
||||
dev_err(&pdev->dev, "Failed to register pinctrl\n");
|
||||
return PTR_ERR(pctl);
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, pdata);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,569 @@
|
|||
/*
|
||||
* Copyright (C) 2016 IBM Corp.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*/
|
||||
|
||||
#ifndef PINCTRL_ASPEED
|
||||
#define PINCTRL_ASPEED
|
||||
|
||||
#include <linux/pinctrl/pinctrl.h>
|
||||
#include <linux/pinctrl/pinmux.h>
|
||||
#include <linux/pinctrl/pinconf.h>
|
||||
#include <linux/pinctrl/pinconf-generic.h>
|
||||
#include <linux/regmap.h>
|
||||
|
||||
/*
|
||||
* The ASPEED SoCs provide typically more than 200 pins for GPIO and other
|
||||
* functions. The SoC function enabled on a pin is determined on a priority
|
||||
* basis where a given pin can provide a number of different signal types.
|
||||
*
|
||||
* The signal active on a pin is described by both a priority level and
|
||||
* compound logical expressions involving multiple operators, registers and
|
||||
* bits. Some difficulty arises as the pin's function bit masks for each
|
||||
* priority level are frequently not the same (i.e. cannot just flip a bit to
|
||||
* change from a high to low priority signal), or even in the same register.
|
||||
* Further, not all signals can be unmuxed, as some expressions depend on
|
||||
* values in the hardware strapping register (which is treated as read-only).
|
||||
*
|
||||
* SoC Multi-function Pin Expression Examples
|
||||
* ------------------------------------------
|
||||
*
|
||||
* Here are some sample mux configurations from the AST2400 and AST2500
|
||||
* datasheets to illustrate the corner cases, roughly in order of least to most
|
||||
* corner. The signal priorities are in decending order from P0 (highest).
|
||||
*
|
||||
* D6 is a pin with a single function (beside GPIO); a high priority signal
|
||||
* that participates in one function:
|
||||
*
|
||||
* Ball | Default | P0 Signal | P0 Expression | P1 Signal | P1 Expression | Other
|
||||
* -----+---------+-----------+-----------------------------+-----------+---------------+----------
|
||||
* D6 GPIOA0 MAC1LINK SCU80[0]=1 GPIOA0
|
||||
* -----+---------+-----------+-----------------------------+-----------+---------------+----------
|
||||
*
|
||||
* C5 is a multi-signal pin (high and low priority signals). Here we touch
|
||||
* different registers for the different functions that enable each signal:
|
||||
*
|
||||
* -----+---------+-----------+-----------------------------+-----------+---------------+----------
|
||||
* C5 GPIOA4 SCL9 SCU90[22]=1 TIMER5 SCU80[4]=1 GPIOA4
|
||||
* -----+---------+-----------+-----------------------------+-----------+---------------+----------
|
||||
*
|
||||
* E19 is a single-signal pin with two functions that influence the active
|
||||
* signal. In this case both bits have the same meaning - enable a dedicated
|
||||
* LPC reset pin. However it's not always the case that the bits in the
|
||||
* OR-relationship have the same meaning.
|
||||
*
|
||||
* -----+---------+-----------+-----------------------------+-----------+---------------+----------
|
||||
* E19 GPIOB4 LPCRST# SCU80[12]=1 | Strap[14]=1 GPIOB4
|
||||
* -----+---------+-----------+-----------------------------+-----------+---------------+----------
|
||||
*
|
||||
* For example, pin B19 has a low-priority signal that's enabled by two
|
||||
* distinct SoC functions: A specific SIOPBI bit in register SCUA4, and an ACPI
|
||||
* bit in the STRAP register. The ACPI bit configures signals on pins in
|
||||
* addition to B19. Both of the low priority functions as well as the high
|
||||
* priority function must be disabled for GPIOF1 to be used.
|
||||
*
|
||||
* Ball | Default | P0 Signal | P0 Expression | P1 Signal | P1 Expression | Other
|
||||
* -----+---------+-----------+-----------------------------------------+-----------+----------------------------------------+----------
|
||||
* B19 GPIOF1 NDCD4 SCU80[25]=1 SIOPBI# SCUA4[12]=1 | Strap[19]=0 GPIOF1
|
||||
* -----+---------+-----------+-----------------------------------------+-----------+----------------------------------------+----------
|
||||
*
|
||||
* For pin E18, the SoC ANDs the expected state of three bits to determine the
|
||||
* pin's active signal:
|
||||
*
|
||||
* * SCU3C[3]: Enable external SOC reset function
|
||||
* * SCU80[15]: Enable SPICS1# or EXTRST# function pin
|
||||
* * SCU90[31]: Select SPI interface CS# output
|
||||
*
|
||||
* -----+---------+-----------+-----------------------------------------+-----------+----------------------------------------+----------
|
||||
* E18 GPIOB7 EXTRST# SCU3C[3]=1 & SCU80[15]=1 & SCU90[31]=0 SPICS1# SCU3C[3]=1 & SCU80[15]=1 & SCU90[31]=1 GPIOB7
|
||||
* -----+---------+-----------+-----------------------------------------+-----------+----------------------------------------+----------
|
||||
*
|
||||
* (Bits SCU3C[3] and SCU80[15] appear to only be used in the expressions for
|
||||
* selecting the signals on pin E18)
|
||||
*
|
||||
* Pin T5 is a multi-signal pin with a more complex configuration:
|
||||
*
|
||||
* Ball | Default | P0 Signal | P0 Expression | P1 Signal | P1 Expression | Other
|
||||
* -----+---------+-----------+------------------------------+-----------+---------------+----------
|
||||
* T5 GPIOL1 VPIDE SCU90[5:4]!=0 & SCU84[17]=1 NDCD1 SCU84[17]=1 GPIOL1
|
||||
* -----+---------+-----------+------------------------------+-----------+---------------+----------
|
||||
*
|
||||
* The high priority signal configuration is best thought of in terms of its
|
||||
* exploded form, with reference to the SCU90[5:4] bits:
|
||||
*
|
||||
* * SCU90[5:4]=00: disable
|
||||
* * SCU90[5:4]=01: 18 bits (R6/G6/B6) video mode.
|
||||
* * SCU90[5:4]=10: 24 bits (R8/G8/B8) video mode.
|
||||
* * SCU90[5:4]=11: 30 bits (R10/G10/B10) video mode.
|
||||
*
|
||||
* Re-writing:
|
||||
*
|
||||
* -----+---------+-----------+------------------------------+-----------+---------------+----------
|
||||
* T5 GPIOL1 VPIDE (SCU90[5:4]=1 & SCU84[17]=1) NDCD1 SCU84[17]=1 GPIOL1
|
||||
* | (SCU90[5:4]=2 & SCU84[17]=1)
|
||||
* | (SCU90[5:4]=3 & SCU84[17]=1)
|
||||
* -----+---------+-----------+------------------------------+-----------+---------------+----------
|
||||
*
|
||||
* For reference the SCU84[17] bit configure the "UART1 NDCD1 or Video VPIDE
|
||||
* function pin", where the signal itself is determined by whether SCU94[5:4]
|
||||
* is disabled or in one of the 18, 24 or 30bit video modes.
|
||||
*
|
||||
* Other video-input-related pins require an explicit state in SCU90[5:4], e.g.
|
||||
* W1 and U5:
|
||||
*
|
||||
* -----+---------+-----------+------------------------------+-----------+---------------+----------
|
||||
* W1 GPIOL6 VPIB0 SCU90[5:4]=3 & SCU84[22]=1 TXD1 SCU84[22]=1 GPIOL6
|
||||
* U5 GPIOL7 VPIB1 SCU90[5:4]=3 & SCU84[23]=1 RXD1 SCU84[23]=1 GPIOL7
|
||||
* -----+---------+-----------+------------------------------+-----------+---------------+----------
|
||||
*
|
||||
* The examples of T5 and W1 are particularly fertile, as they also demonstrate
|
||||
* that despite operating as part of the video input bus each signal needs to
|
||||
* be enabled individually via it's own SCU84 (in the cases of T5 and W1)
|
||||
* register bit. This is a little crazy if the bus doesn't have optional
|
||||
* signals, but is used to decent effect with some of the UARTs where not all
|
||||
* signals are required. However, this isn't done consistently - UART1 is
|
||||
* enabled on a per-pin basis, and by contrast, all signals for UART6 are
|
||||
* enabled by a single bit.
|
||||
*
|
||||
* Further, the high and low priority signals listed in the table above share
|
||||
* a configuration bit. The VPI signals should operate in concert in a single
|
||||
* function, but the UART signals should retain the ability to be configured
|
||||
* independently. This pushes the implementation down the path of tagging a
|
||||
* signal's expressions with the function they participate in, rather than
|
||||
* defining masks affecting multiple signals per function. The latter approach
|
||||
* fails in this instance where applying the configuration for the UART pin of
|
||||
* interest will stomp on the state of other UART signals when disabling the
|
||||
* VPI functions on the current pin.
|
||||
*
|
||||
* Ball | Default | P0 Signal | P0 Expression | P1 Signal | P1 Expression | Other
|
||||
* -----+------------+-----------+---------------------------+-----------+---------------+------------
|
||||
* A12 RGMII1TXCK GPIOT0 SCUA0[0]=1 RMII1TXEN Strap[6]=0 RGMII1TXCK
|
||||
* B12 RGMII1TXCTL GPIOT1 SCUA0[1]=1 – Strap[6]=0 RGMII1TXCTL
|
||||
* -----+------------+-----------+---------------------------+-----------+---------------+------------
|
||||
*
|
||||
* A12 demonstrates that the "Other" signal isn't always GPIO - in this case
|
||||
* GPIOT0 is a high-priority signal and RGMII1TXCK is Other. Thus, GPIO
|
||||
* should be treated like any other signal type with full function expression
|
||||
* requirements, and not assumed to be the default case. Separately, GPIOT0 and
|
||||
* GPIOT1's signal descriptor bits are distinct, therefore we must iterate all
|
||||
* pins in the function's group to disable the higher-priority signals such
|
||||
* that the signal for the function of interest is correctly enabled.
|
||||
*
|
||||
* Finally, three priority levels aren't always enough; the AST2500 brings with
|
||||
* it 18 pins of five priority levels, however the 18 pins only use three of
|
||||
* the five priority levels.
|
||||
*
|
||||
* Ultimately the requirement to control pins in the examples above drive the
|
||||
* design:
|
||||
*
|
||||
* * Pins provide signals according to functions activated in the mux
|
||||
* configuration
|
||||
*
|
||||
* * Pins provide up to five signal types in a priority order
|
||||
*
|
||||
* * For priorities levels defined on a pin, each priority provides one signal
|
||||
*
|
||||
* * Enabling lower priority signals requires higher priority signals be
|
||||
* disabled
|
||||
*
|
||||
* * A function represents a set of signals; functions are distinct if their
|
||||
* sets of signals are not equal
|
||||
*
|
||||
* * Signals participate in one or more functions
|
||||
*
|
||||
* * A function is described by an expression of one or more signal
|
||||
* descriptors, which compare bit values in a register
|
||||
*
|
||||
* * A signal expression is the smallest set of signal descriptors whose
|
||||
* comparisons must evaluate 'true' for a signal to be enabled on a pin.
|
||||
*
|
||||
* * A function's signal is active on a pin if evaluating all signal
|
||||
* descriptors in the pin's signal expression for the function yields a 'true'
|
||||
* result
|
||||
*
|
||||
* * A signal at a given priority on a given pin is active if any of the
|
||||
* functions in which the signal participates are active, and no higher
|
||||
* priority signal on the pin is active
|
||||
*
|
||||
* * GPIO is configured per-pin
|
||||
*
|
||||
* And so:
|
||||
*
|
||||
* * To disable a signal, any function(s) activating the signal must be
|
||||
* disabled
|
||||
*
|
||||
* * Each pin must know the signal expressions of functions in which it
|
||||
* participates, for the purpose of enabling the Other function. This is done
|
||||
* by deactivating all functions that activate higher priority signals on the
|
||||
* pin.
|
||||
*
|
||||
* As a concrete example:
|
||||
*
|
||||
* * T5 provides three signals types: VPIDE, NDCD1 and GPIO
|
||||
*
|
||||
* * The VPIDE signal participates in 3 functions: VPI18, VPI24 and VPI30
|
||||
*
|
||||
* * The NDCD1 signal participates in just its own NDCD1 function
|
||||
*
|
||||
* * VPIDE is high priority, NDCD1 is low priority, and GPIOL1 is the least
|
||||
* prioritised
|
||||
*
|
||||
* * The prerequisit for activating the NDCD1 signal is that the VPI18, VPI24
|
||||
* and VPI30 functions all be disabled
|
||||
*
|
||||
* * Similarly, all of VPI18, VPI24, VPI30 and NDCD1 functions must be disabled
|
||||
* to provide GPIOL6
|
||||
*
|
||||
* Considerations
|
||||
* --------------
|
||||
*
|
||||
* If pinctrl allows us to allocate a pin we can configure a function without
|
||||
* concern for the function of already allocated pins, if pin groups are
|
||||
* created with respect to the SoC functions in which they participate. This is
|
||||
* intuitive, but it did not feel obvious from the bit/pin relationships.
|
||||
*
|
||||
* Conversely, failing to allocate all pins in a group indicates some bits (as
|
||||
* well as pins) required for the group's configuration will already be in use,
|
||||
* likely in a way that's inconsistent with the requirements of the failed
|
||||
* group.
|
||||
*/
|
||||
|
||||
/*
|
||||
* The "Multi-function Pins Mapping and Control" table in the SoC datasheet
|
||||
* references registers by the device/offset mnemonic. The register macros
|
||||
* below are named the same way to ease transcription and verification (as
|
||||
* opposed to naming them e.g. PINMUX_CTRL_[0-9]). Further, signal expressions
|
||||
* reference registers beyond those dedicated to pinmux, such as the system
|
||||
* reset control and MAC clock configuration registers. The AST2500 goes a step
|
||||
* further and references registers in the graphics IP block, but that isn't
|
||||
* handled yet.
|
||||
*/
|
||||
#define SCU2C 0x2C /* Misc. Control Register */
|
||||
#define SCU3C 0x3C /* System Reset Control/Status Register */
|
||||
#define SCU48 0x48 /* MAC Interface Clock Delay Setting */
|
||||
#define HW_STRAP1 0x70 /* AST2400 strapping is 33 bits, is split */
|
||||
#define SCU80 0x80 /* Multi-function Pin Control #1 */
|
||||
#define SCU84 0x84 /* Multi-function Pin Control #2 */
|
||||
#define SCU88 0x88 /* Multi-function Pin Control #3 */
|
||||
#define SCU8C 0x8C /* Multi-function Pin Control #4 */
|
||||
#define SCU90 0x90 /* Multi-function Pin Control #5 */
|
||||
#define SCU94 0x94 /* Multi-function Pin Control #6 */
|
||||
#define SCUA0 0xA0 /* Multi-function Pin Control #7 */
|
||||
#define SCUA4 0xA4 /* Multi-function Pin Control #8 */
|
||||
#define SCUA8 0xA8 /* Multi-function Pin Control #9 */
|
||||
#define HW_STRAP2 0xD0 /* Strapping */
|
||||
|
||||
/**
|
||||
* A signal descriptor, which describes the register, bits and the
|
||||
* enable/disable values that should be compared or written.
|
||||
*
|
||||
* @reg: The register offset from base in bytes
|
||||
* @mask: The mask to apply to the register. The lowest set bit of the mask is
|
||||
* used to derive the shift value.
|
||||
* @enable: The value that enables the function. Value should be in the LSBs,
|
||||
* not at the position of the mask.
|
||||
* @disable: The value that disables the function. Value should be in the
|
||||
* LSBs, not at the position of the mask.
|
||||
*/
|
||||
struct aspeed_sig_desc {
|
||||
unsigned int reg;
|
||||
u32 mask;
|
||||
u32 enable;
|
||||
u32 disable;
|
||||
};
|
||||
|
||||
/**
|
||||
* Describes a signal expression. The expression is evaluated by ANDing the
|
||||
* evaluation of the descriptors.
|
||||
*
|
||||
* @signal: The signal name for the priority level on the pin. If the signal
|
||||
* type is GPIO, then the signal name must begin with the string
|
||||
* "GPIO", e.g. GPIOA0, GPIOT4 etc.
|
||||
* @function: The name of the function the signal participates in for the
|
||||
* associated expression
|
||||
* @ndescs: The number of signal descriptors in the expression
|
||||
* @descs: Pointer to an array of signal descriptors that comprise the
|
||||
* function expression
|
||||
*/
|
||||
struct aspeed_sig_expr {
|
||||
const char *signal;
|
||||
const char *function;
|
||||
int ndescs;
|
||||
const struct aspeed_sig_desc *descs;
|
||||
};
|
||||
|
||||
/**
|
||||
* A struct capturing the list of expressions enabling signals at each priority
|
||||
* for a given pin. The signal configuration for a priority level is evaluated
|
||||
* by ORing the evaluation of the signal expressions in the respective
|
||||
* priority's list.
|
||||
*
|
||||
* @name: A name for the pin
|
||||
* @prios: A pointer to an array of expression list pointers
|
||||
*
|
||||
*/
|
||||
struct aspeed_pin_desc {
|
||||
const char *name;
|
||||
const struct aspeed_sig_expr ***prios;
|
||||
};
|
||||
|
||||
/* Macro hell */
|
||||
|
||||
/**
|
||||
* Short-hand macro for describing a configuration enabled by the state of one
|
||||
* bit. The disable value is derived.
|
||||
*
|
||||
* @reg: The signal's associated register, offset from base
|
||||
* @idx: The signal's bit index in the register
|
||||
* @val: The value (0 or 1) that enables the function
|
||||
*/
|
||||
#define SIG_DESC_BIT(reg, idx, val) \
|
||||
{ reg, BIT_MASK(idx), val, (((val) + 1) & 1) }
|
||||
|
||||
/**
|
||||
* A further short-hand macro describing a configuration enabled with a set bit.
|
||||
*
|
||||
* @reg: The configuration's associated register, offset from base
|
||||
* @idx: The configuration's bit index in the register
|
||||
*/
|
||||
#define SIG_DESC_SET(reg, idx) SIG_DESC_BIT(reg, idx, 1)
|
||||
|
||||
#define SIG_DESC_LIST_SYM(sig, func) sig_descs_ ## sig ## _ ## func
|
||||
#define SIG_DESC_LIST_DECL(sig, func, ...) \
|
||||
static const struct aspeed_sig_desc SIG_DESC_LIST_SYM(sig, func)[] = \
|
||||
{ __VA_ARGS__ }
|
||||
|
||||
#define SIG_EXPR_SYM(sig, func) sig_expr_ ## sig ## _ ## func
|
||||
#define SIG_EXPR_DECL_(sig, func) \
|
||||
static const struct aspeed_sig_expr SIG_EXPR_SYM(sig, func) = \
|
||||
{ \
|
||||
.signal = #sig, \
|
||||
.function = #func, \
|
||||
.ndescs = ARRAY_SIZE(SIG_DESC_LIST_SYM(sig, func)), \
|
||||
.descs = &(SIG_DESC_LIST_SYM(sig, func))[0], \
|
||||
}
|
||||
|
||||
/**
|
||||
* Declare a signal expression.
|
||||
*
|
||||
* @sig: A macro symbol name for the signal (is subjected to stringification
|
||||
* and token pasting)
|
||||
* @func: The function in which the signal is participating
|
||||
* @...: Signal descriptors that define the signal expression
|
||||
*
|
||||
* For example, the following declares the ROMD8 signal for the ROM16 function:
|
||||
*
|
||||
* SIG_EXPR_DECL(ROMD8, ROM16, SIG_DESC_SET(SCU90, 6));
|
||||
*
|
||||
* And with multiple signal descriptors:
|
||||
*
|
||||
* SIG_EXPR_DECL(ROMD8, ROM16S, SIG_DESC_SET(HW_STRAP1, 4),
|
||||
* { HW_STRAP1, GENMASK(1, 0), 0, 0 });
|
||||
*/
|
||||
#define SIG_EXPR_DECL(sig, func, ...) \
|
||||
SIG_DESC_LIST_DECL(sig, func, __VA_ARGS__); \
|
||||
SIG_EXPR_DECL_(sig, func)
|
||||
|
||||
/**
|
||||
* Declare a pointer to a signal expression
|
||||
*
|
||||
* @sig: The macro symbol name for the signal (subjected to token pasting)
|
||||
* @func: The macro symbol name for the function (subjected to token pasting)
|
||||
*/
|
||||
#define SIG_EXPR_PTR(sig, func) (&SIG_EXPR_SYM(sig, func))
|
||||
|
||||
#define SIG_EXPR_LIST_SYM(sig) sig_exprs_ ## sig
|
||||
|
||||
/**
|
||||
* Declare a signal expression list for reference in a struct aspeed_pin_prio.
|
||||
*
|
||||
* @sig: A macro symbol name for the signal (is subjected to token pasting)
|
||||
* @...: Signal expression structure pointers (use SIG_EXPR_PTR())
|
||||
*
|
||||
* For example, the 16-bit ROM bus can be enabled by one of two possible signal
|
||||
* expressions:
|
||||
*
|
||||
* SIG_EXPR_DECL(ROMD8, ROM16, SIG_DESC_SET(SCU90, 6));
|
||||
* SIG_EXPR_DECL(ROMD8, ROM16S, SIG_DESC_SET(HW_STRAP1, 4),
|
||||
* { HW_STRAP1, GENMASK(1, 0), 0, 0 });
|
||||
* SIG_EXPR_LIST_DECL(ROMD8, SIG_EXPR_PTR(ROMD8, ROM16),
|
||||
* SIG_EXPR_PTR(ROMD8, ROM16S));
|
||||
*/
|
||||
#define SIG_EXPR_LIST_DECL(sig, ...) \
|
||||
static const struct aspeed_sig_expr *SIG_EXPR_LIST_SYM(sig)[] = \
|
||||
{ __VA_ARGS__, NULL }
|
||||
|
||||
/**
|
||||
* A short-hand macro for declaring a function expression and an expression
|
||||
* list with a single function.
|
||||
*
|
||||
* @func: A macro symbol name for the function (is subjected to token pasting)
|
||||
* @...: Function descriptors that define the function expression
|
||||
*
|
||||
* For example, signal NCTS6 participates in its own function with one group:
|
||||
*
|
||||
* SIG_EXPR_LIST_DECL_SINGLE(NCTS6, NCTS6, SIG_DESC_SET(SCU90, 7));
|
||||
*/
|
||||
#define SIG_EXPR_LIST_DECL_SINGLE(sig, func, ...) \
|
||||
SIG_DESC_LIST_DECL(sig, func, __VA_ARGS__); \
|
||||
SIG_EXPR_DECL_(sig, func); \
|
||||
SIG_EXPR_LIST_DECL(sig, SIG_EXPR_PTR(sig, func))
|
||||
|
||||
#define SIG_EXPR_LIST_DECL_DUAL(sig, f0, f1) \
|
||||
SIG_EXPR_LIST_DECL(sig, SIG_EXPR_PTR(sig, f0), SIG_EXPR_PTR(sig, f1))
|
||||
|
||||
#define SIG_EXPR_LIST_PTR(sig) (&SIG_EXPR_LIST_SYM(sig)[0])
|
||||
|
||||
#define PIN_EXPRS_SYM(pin) pin_exprs_ ## pin
|
||||
#define PIN_EXPRS_PTR(pin) (&PIN_EXPRS_SYM(pin)[0])
|
||||
#define PIN_SYM(pin) pin_ ## pin
|
||||
|
||||
#define MS_PIN_DECL_(pin, ...) \
|
||||
static const struct aspeed_sig_expr **PIN_EXPRS_SYM(pin)[] = \
|
||||
{ __VA_ARGS__, NULL }; \
|
||||
static const struct aspeed_pin_desc PIN_SYM(pin) = \
|
||||
{ #pin, PIN_EXPRS_PTR(pin) }
|
||||
|
||||
/**
|
||||
* Declare a multi-signal pin
|
||||
*
|
||||
* @pin: The pin number
|
||||
* @other: Macro name for "other" functionality (subjected to stringification)
|
||||
* @high: Macro name for the highest priority signal functions
|
||||
* @low: Macro name for the low signal functions
|
||||
*
|
||||
* For example:
|
||||
*
|
||||
* #define A8 56
|
||||
* SIG_EXPR_DECL(ROMD8, ROM16, SIG_DESC_SET(SCU90, 6));
|
||||
* SIG_EXPR_DECL(ROMD8, ROM16S, SIG_DESC_SET(HW_STRAP1, 4),
|
||||
* { HW_STRAP1, GENMASK(1, 0), 0, 0 });
|
||||
* SIG_EXPR_LIST_DECL(ROMD8, SIG_EXPR_PTR(ROMD8, ROM16),
|
||||
* SIG_EXPR_PTR(ROMD8, ROM16S));
|
||||
* SIG_EXPR_LIST_DECL_SINGLE(NCTS6, NCTS6, SIG_DESC_SET(SCU90, 7));
|
||||
* MS_PIN_DECL(A8, GPIOH0, ROMD8, NCTS6);
|
||||
*/
|
||||
#define MS_PIN_DECL(pin, other, high, low) \
|
||||
SIG_EXPR_LIST_DECL_SINGLE(other, other); \
|
||||
MS_PIN_DECL_(pin, \
|
||||
SIG_EXPR_LIST_PTR(high), \
|
||||
SIG_EXPR_LIST_PTR(low), \
|
||||
SIG_EXPR_LIST_PTR(other))
|
||||
|
||||
#define PIN_GROUP_SYM(func) pins_ ## func
|
||||
#define FUNC_GROUP_SYM(func) groups_ ## func
|
||||
#define FUNC_GROUP_DECL(func, ...) \
|
||||
static const int PIN_GROUP_SYM(func)[] = { __VA_ARGS__ }; \
|
||||
static const char *FUNC_GROUP_SYM(func)[] = { #func }
|
||||
|
||||
/**
|
||||
* Declare a single signal pin
|
||||
*
|
||||
* @pin: The pin number
|
||||
* @other: Macro name for "other" functionality (subjected to stringification)
|
||||
* @sig: Macro name for the signal (subjected to stringification)
|
||||
*
|
||||
* For example:
|
||||
*
|
||||
* #define E3 80
|
||||
* SIG_EXPR_LIST_DECL_SINGLE(SCL5, I2C5, I2C5_DESC);
|
||||
* SS_PIN_DECL(E3, GPIOK0, SCL5);
|
||||
*/
|
||||
#define SS_PIN_DECL(pin, other, sig) \
|
||||
SIG_EXPR_LIST_DECL_SINGLE(other, other); \
|
||||
MS_PIN_DECL_(pin, SIG_EXPR_LIST_PTR(sig), SIG_EXPR_LIST_PTR(other))
|
||||
|
||||
/**
|
||||
* Single signal, single function pin declaration
|
||||
*
|
||||
* @pin: The pin number
|
||||
* @other: Macro name for "other" functionality (subjected to stringification)
|
||||
* @sig: Macro name for the signal (subjected to stringification)
|
||||
* @...: Signal descriptors that define the function expression
|
||||
*
|
||||
* For example:
|
||||
*
|
||||
* SSSF_PIN_DECL(A4, GPIOA2, TIMER3, SIG_DESC_SET(SCU80, 2));
|
||||
*/
|
||||
#define SSSF_PIN_DECL(pin, other, sig, ...) \
|
||||
SIG_EXPR_LIST_DECL_SINGLE(sig, sig, __VA_ARGS__); \
|
||||
SIG_EXPR_LIST_DECL_SINGLE(other, other); \
|
||||
MS_PIN_DECL_(pin, SIG_EXPR_LIST_PTR(sig), SIG_EXPR_LIST_PTR(other)); \
|
||||
FUNC_GROUP_DECL(sig, pin)
|
||||
|
||||
#define GPIO_PIN_DECL(pin, gpio) \
|
||||
SIG_EXPR_LIST_DECL_SINGLE(gpio, gpio); \
|
||||
MS_PIN_DECL_(pin, SIG_EXPR_LIST_PTR(gpio))
|
||||
|
||||
struct aspeed_pinctrl_data {
|
||||
struct regmap *map;
|
||||
|
||||
const struct pinctrl_pin_desc *pins;
|
||||
const unsigned int npins;
|
||||
|
||||
const struct aspeed_pin_group *groups;
|
||||
const unsigned int ngroups;
|
||||
|
||||
const struct aspeed_pin_function *functions;
|
||||
const unsigned int nfunctions;
|
||||
};
|
||||
|
||||
#define ASPEED_PINCTRL_PIN(name_) \
|
||||
[name_] = { \
|
||||
.number = name_, \
|
||||
.name = #name_, \
|
||||
.drv_data = (void *) &(PIN_SYM(name_)) \
|
||||
}
|
||||
|
||||
struct aspeed_pin_group {
|
||||
const char *name;
|
||||
const unsigned int *pins;
|
||||
const unsigned int npins;
|
||||
};
|
||||
|
||||
#define ASPEED_PINCTRL_GROUP(name_) { \
|
||||
.name = #name_, \
|
||||
.pins = &(PIN_GROUP_SYM(name_))[0], \
|
||||
.npins = ARRAY_SIZE(PIN_GROUP_SYM(name_)), \
|
||||
}
|
||||
|
||||
struct aspeed_pin_function {
|
||||
const char *name;
|
||||
const char *const *groups;
|
||||
unsigned int ngroups;
|
||||
};
|
||||
|
||||
#define ASPEED_PINCTRL_FUNC(name_, ...) { \
|
||||
.name = #name_, \
|
||||
.groups = &FUNC_GROUP_SYM(name_)[0], \
|
||||
.ngroups = ARRAY_SIZE(FUNC_GROUP_SYM(name_)), \
|
||||
}
|
||||
|
||||
int aspeed_pinctrl_get_groups_count(struct pinctrl_dev *pctldev);
|
||||
const char *aspeed_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
|
||||
unsigned int group);
|
||||
int aspeed_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
|
||||
unsigned int group, const unsigned int **pins,
|
||||
unsigned int *npins);
|
||||
void aspeed_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
|
||||
struct seq_file *s, unsigned int offset);
|
||||
int aspeed_pinmux_get_fn_count(struct pinctrl_dev *pctldev);
|
||||
const char *aspeed_pinmux_get_fn_name(struct pinctrl_dev *pctldev,
|
||||
unsigned int function);
|
||||
int aspeed_pinmux_get_fn_groups(struct pinctrl_dev *pctldev,
|
||||
unsigned int function, const char * const **groups,
|
||||
unsigned int * const num_groups);
|
||||
int aspeed_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned int function,
|
||||
unsigned int group);
|
||||
int aspeed_gpio_request_enable(struct pinctrl_dev *pctldev,
|
||||
struct pinctrl_gpio_range *range,
|
||||
unsigned int offset);
|
||||
int aspeed_pinctrl_probe(struct platform_device *pdev,
|
||||
struct pinctrl_desc *pdesc,
|
||||
struct aspeed_pinctrl_data *pdata);
|
||||
|
||||
#endif /* PINCTRL_ASPEED */
|
||||
Loading…
Reference in New Issue