440 lines
11 KiB
C
440 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Marvell PXA2xx family pin control
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*
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* Copyright (C) 2015 Robert Jarzmik
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*/
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#include <linux/bitops.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/module.h>
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#include <linux/pinctrl/machine.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include <linux/pinctrl/pinmux.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include "../pinctrl-utils.h"
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#include "pinctrl-pxa2xx.h"
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static int pxa2xx_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
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{
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struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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return pctl->ngroups;
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}
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static const char *pxa2xx_pctrl_get_group_name(struct pinctrl_dev *pctldev,
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unsigned tgroup)
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{
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struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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struct pxa_pinctrl_group *group = pctl->groups + tgroup;
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return group->name;
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}
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static int pxa2xx_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
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unsigned tgroup,
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const unsigned **pins,
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unsigned *num_pins)
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{
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struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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struct pxa_pinctrl_group *group = pctl->groups + tgroup;
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*pins = (unsigned *)&group->pin;
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*num_pins = 1;
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return 0;
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}
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static const struct pinctrl_ops pxa2xx_pctl_ops = {
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#ifdef CONFIG_OF
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.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
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.dt_free_map = pinctrl_utils_free_map,
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#endif
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.get_groups_count = pxa2xx_pctrl_get_groups_count,
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.get_group_name = pxa2xx_pctrl_get_group_name,
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.get_group_pins = pxa2xx_pctrl_get_group_pins,
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};
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static struct pxa_desc_function *
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pxa_desc_by_func_group(struct pxa_pinctrl *pctl, const char *pin_name,
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const char *func_name)
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{
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int i;
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struct pxa_desc_function *df;
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for (i = 0; i < pctl->npins; i++) {
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const struct pxa_desc_pin *pin = pctl->ppins + i;
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if (!strcmp(pin->pin.name, pin_name))
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for (df = pin->functions; df->name; df++)
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if (!strcmp(df->name, func_name))
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return df;
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}
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return NULL;
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}
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static int pxa2xx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned pin,
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bool input)
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{
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struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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unsigned long flags;
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uint32_t val;
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void __iomem *gpdr;
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gpdr = pctl->base_gpdr[pin / 32];
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dev_dbg(pctl->dev, "set_direction(pin=%d): dir=%d\n",
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pin, !input);
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spin_lock_irqsave(&pctl->lock, flags);
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val = readl_relaxed(gpdr);
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val = (val & ~BIT(pin % 32)) | (input ? 0 : BIT(pin % 32));
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writel_relaxed(val, gpdr);
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spin_unlock_irqrestore(&pctl->lock, flags);
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return 0;
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}
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static const char *pxa2xx_pmx_get_func_name(struct pinctrl_dev *pctldev,
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unsigned function)
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{
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struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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struct pxa_pinctrl_function *pf = pctl->functions + function;
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return pf->name;
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}
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static int pxa2xx_get_functions_count(struct pinctrl_dev *pctldev)
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{
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struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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return pctl->nfuncs;
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}
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static int pxa2xx_pmx_get_func_groups(struct pinctrl_dev *pctldev,
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unsigned function,
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const char * const **groups,
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unsigned * const num_groups)
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{
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struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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struct pxa_pinctrl_function *pf = pctl->functions + function;
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*groups = pf->groups;
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*num_groups = pf->ngroups;
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return 0;
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}
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static int pxa2xx_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned function,
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unsigned tgroup)
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{
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struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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struct pxa_pinctrl_group *group = pctl->groups + tgroup;
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struct pxa_desc_function *df;
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int pin, shift;
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unsigned long flags;
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void __iomem *gafr, *gpdr;
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u32 val;
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df = pxa_desc_by_func_group(pctl, group->name,
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(pctl->functions + function)->name);
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if (!df)
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return -EINVAL;
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pin = group->pin;
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gafr = pctl->base_gafr[pin / 16];
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gpdr = pctl->base_gpdr[pin / 32];
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shift = (pin % 16) << 1;
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dev_dbg(pctl->dev, "set_mux(pin=%d): af=%d dir=%d\n",
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pin, df->muxval >> 1, df->muxval & 0x1);
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spin_lock_irqsave(&pctl->lock, flags);
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val = readl_relaxed(gafr);
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val = (val & ~(0x3 << shift)) | ((df->muxval >> 1) << shift);
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writel_relaxed(val, gafr);
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val = readl_relaxed(gpdr);
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val = (val & ~BIT(pin % 32)) | ((df->muxval & 1) ? BIT(pin % 32) : 0);
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writel_relaxed(val, gpdr);
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spin_unlock_irqrestore(&pctl->lock, flags);
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return 0;
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}
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static const struct pinmux_ops pxa2xx_pinmux_ops = {
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.get_functions_count = pxa2xx_get_functions_count,
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.get_function_name = pxa2xx_pmx_get_func_name,
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.get_function_groups = pxa2xx_pmx_get_func_groups,
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.set_mux = pxa2xx_pmx_set_mux,
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.gpio_set_direction = pxa2xx_pmx_gpio_set_direction,
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};
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static int pxa2xx_pconf_group_get(struct pinctrl_dev *pctldev,
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unsigned group,
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unsigned long *config)
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{
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struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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struct pxa_pinctrl_group *g = pctl->groups + group;
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unsigned long flags;
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unsigned pin = g->pin;
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void __iomem *pgsr = pctl->base_pgsr[pin / 32];
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u32 val;
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spin_lock_irqsave(&pctl->lock, flags);
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val = readl_relaxed(pgsr) & BIT(pin % 32);
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*config = val ? PIN_CONFIG_LOW_POWER_MODE : 0;
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spin_unlock_irqrestore(&pctl->lock, flags);
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dev_dbg(pctl->dev, "get sleep gpio state(pin=%d) %d\n",
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pin, !!val);
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return 0;
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}
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static int pxa2xx_pconf_group_set(struct pinctrl_dev *pctldev,
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unsigned group,
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unsigned long *configs,
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unsigned num_configs)
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{
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struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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struct pxa_pinctrl_group *g = pctl->groups + group;
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unsigned long flags;
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unsigned pin = g->pin;
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void __iomem *pgsr = pctl->base_pgsr[pin / 32];
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int i, is_set = 0;
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u32 val;
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for (i = 0; i < num_configs; i++) {
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switch (pinconf_to_config_param(configs[i])) {
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case PIN_CONFIG_LOW_POWER_MODE:
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is_set = pinconf_to_config_argument(configs[i]);
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break;
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default:
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return -EINVAL;
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}
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}
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dev_dbg(pctl->dev, "set sleep gpio state(pin=%d) %d\n",
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pin, is_set);
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spin_lock_irqsave(&pctl->lock, flags);
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val = readl_relaxed(pgsr);
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val = (val & ~BIT(pin % 32)) | (is_set ? BIT(pin % 32) : 0);
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writel_relaxed(val, pgsr);
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spin_unlock_irqrestore(&pctl->lock, flags);
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return 0;
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}
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static const struct pinconf_ops pxa2xx_pconf_ops = {
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.pin_config_group_get = pxa2xx_pconf_group_get,
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.pin_config_group_set = pxa2xx_pconf_group_set,
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.is_generic = true,
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};
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static struct pinctrl_desc pxa2xx_pinctrl_desc = {
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.confops = &pxa2xx_pconf_ops,
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.pctlops = &pxa2xx_pctl_ops,
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.pmxops = &pxa2xx_pinmux_ops,
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};
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static const struct pxa_pinctrl_function *
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pxa2xx_find_function(struct pxa_pinctrl *pctl, const char *fname,
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const struct pxa_pinctrl_function *functions)
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{
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const struct pxa_pinctrl_function *func;
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for (func = functions; func->name; func++)
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if (!strcmp(fname, func->name))
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return func;
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return NULL;
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}
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static int pxa2xx_build_functions(struct pxa_pinctrl *pctl)
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{
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int i;
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struct pxa_pinctrl_function *functions;
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struct pxa_desc_function *df;
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/*
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* Each pin can have at most 6 alternate functions, and 2 gpio functions
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* which are common to each pin. As there are more than 2 pins without
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* alternate function, 6 * npins is an absolute high limit of the number
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* of functions.
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*/
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functions = devm_kcalloc(pctl->dev, pctl->npins * 6,
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sizeof(*functions), GFP_KERNEL);
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if (!functions)
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return -ENOMEM;
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for (i = 0; i < pctl->npins; i++)
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for (df = pctl->ppins[i].functions; df->name; df++)
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if (!pxa2xx_find_function(pctl, df->name, functions))
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(functions + pctl->nfuncs++)->name = df->name;
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pctl->functions = devm_kmemdup(pctl->dev, functions,
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pctl->nfuncs * sizeof(*functions),
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GFP_KERNEL);
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if (!pctl->functions)
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return -ENOMEM;
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devm_kfree(pctl->dev, functions);
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return 0;
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}
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static int pxa2xx_build_groups(struct pxa_pinctrl *pctl)
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{
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int i, j, ngroups;
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struct pxa_pinctrl_function *func;
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struct pxa_desc_function *df;
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char **gtmp;
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gtmp = devm_kmalloc_array(pctl->dev, pctl->npins, sizeof(*gtmp),
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GFP_KERNEL);
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if (!gtmp)
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return -ENOMEM;
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for (i = 0; i < pctl->nfuncs; i++) {
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ngroups = 0;
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for (j = 0; j < pctl->npins; j++)
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for (df = pctl->ppins[j].functions; df->name;
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df++)
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if (!strcmp(pctl->functions[i].name,
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df->name))
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gtmp[ngroups++] = (char *)
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pctl->ppins[j].pin.name;
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func = pctl->functions + i;
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func->ngroups = ngroups;
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func->groups =
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devm_kmalloc_array(pctl->dev, ngroups,
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sizeof(char *), GFP_KERNEL);
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if (!func->groups)
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return -ENOMEM;
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memcpy(func->groups, gtmp, ngroups * sizeof(*gtmp));
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}
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devm_kfree(pctl->dev, gtmp);
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return 0;
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}
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static int pxa2xx_build_state(struct pxa_pinctrl *pctl,
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const struct pxa_desc_pin *ppins, int npins)
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{
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struct pxa_pinctrl_group *group;
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struct pinctrl_pin_desc *pins;
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int ret, i;
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pctl->npins = npins;
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pctl->ppins = ppins;
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pctl->ngroups = npins;
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pctl->desc.npins = npins;
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pins = devm_kcalloc(pctl->dev, npins, sizeof(*pins), GFP_KERNEL);
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if (!pins)
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return -ENOMEM;
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pctl->desc.pins = pins;
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for (i = 0; i < npins; i++)
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pins[i] = ppins[i].pin;
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pctl->groups = devm_kmalloc_array(pctl->dev, pctl->ngroups,
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sizeof(*pctl->groups), GFP_KERNEL);
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if (!pctl->groups)
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return -ENOMEM;
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for (i = 0; i < npins; i++) {
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group = pctl->groups + i;
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group->name = ppins[i].pin.name;
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group->pin = ppins[i].pin.number;
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}
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ret = pxa2xx_build_functions(pctl);
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if (ret)
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return ret;
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ret = pxa2xx_build_groups(pctl);
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if (ret)
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return ret;
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return 0;
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}
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int pxa2xx_pinctrl_init(struct platform_device *pdev,
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const struct pxa_desc_pin *ppins, int npins,
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void __iomem *base_gafr[], void __iomem *base_gpdr[],
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void __iomem *base_pgsr[])
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{
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struct pxa_pinctrl *pctl;
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int ret, i, maxpin = 0;
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for (i = 0; i < npins; i++)
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maxpin = max_t(int, ppins[i].pin.number, maxpin);
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pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
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if (!pctl)
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return -ENOMEM;
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pctl->base_gafr = devm_kcalloc(&pdev->dev, roundup(maxpin, 16),
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sizeof(*pctl->base_gafr), GFP_KERNEL);
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pctl->base_gpdr = devm_kcalloc(&pdev->dev, roundup(maxpin, 32),
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sizeof(*pctl->base_gpdr), GFP_KERNEL);
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pctl->base_pgsr = devm_kcalloc(&pdev->dev, roundup(maxpin, 32),
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sizeof(*pctl->base_pgsr), GFP_KERNEL);
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if (!pctl->base_gafr || !pctl->base_gpdr || !pctl->base_pgsr)
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return -ENOMEM;
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platform_set_drvdata(pdev, pctl);
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spin_lock_init(&pctl->lock);
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pctl->dev = &pdev->dev;
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pctl->desc = pxa2xx_pinctrl_desc;
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pctl->desc.name = dev_name(&pdev->dev);
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pctl->desc.owner = THIS_MODULE;
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for (i = 0; i < roundup(maxpin, 16); i += 16)
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pctl->base_gafr[i / 16] = base_gafr[i / 16];
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for (i = 0; i < roundup(maxpin, 32); i += 32) {
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pctl->base_gpdr[i / 32] = base_gpdr[i / 32];
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pctl->base_pgsr[i / 32] = base_pgsr[i / 32];
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}
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ret = pxa2xx_build_state(pctl, ppins, npins);
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if (ret)
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return ret;
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pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, &pctl->desc, pctl);
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if (IS_ERR(pctl->pctl_dev)) {
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dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
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return PTR_ERR(pctl->pctl_dev);
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}
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dev_info(&pdev->dev, "initialized pxa2xx pinctrl driver\n");
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return 0;
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}
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EXPORT_SYMBOL_GPL(pxa2xx_pinctrl_init);
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int pxa2xx_pinctrl_exit(struct platform_device *pdev)
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{
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struct pxa_pinctrl *pctl = platform_get_drvdata(pdev);
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pinctrl_unregister(pctl->pctl_dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pxa2xx_pinctrl_exit);
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MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
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MODULE_DESCRIPTION("Marvell PXA2xx pinctrl driver");
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MODULE_LICENSE("GPL v2");
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