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Message-ID: <52A24438.4000908@codeaurora.org>
Date: Fri, 06 Dec 2013 13:40:08 -0800
From: Stephen Boyd <sboyd@...eaurora.org>
To: Bjorn Andersson <bjorn.andersson@...ymobile.com>,
Rob Herring <rob.herring@...xeda.com>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Stephen Warren <swarren@...dotorg.org>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Rob Landley <rob@...dley.net>,
Linus Walleij <linus.walleij@...aro.org>,
Grant Likely <grant.likely@...aro.org>,
devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/3] pinctrl: Add Qualcomm TLMM driver
General nitpick: There seems to be a lot of checks for invalid input in
the op functions. I hope that they're all unnecessary debugging that can
be removed.
On 12/05/13 18:10, Bjorn Andersson wrote:
> This adds a pinctrl, pinmux, pinconf and gpiolib driver for the
> Qualcomm TLMM block.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> ---
> drivers/pinctrl/Kconfig | 6 +
> drivers/pinctrl/Makefile | 1 +
> drivers/pinctrl/pinctrl-msm.c | 1028 +++++++++++++++++++++++++++++++++++++++++
> drivers/pinctrl/pinctrl-msm.h | 123 +++++
> 4 files changed, 1158 insertions(+)
> create mode 100644 drivers/pinctrl/pinctrl-msm.c
> create mode 100644 drivers/pinctrl/pinctrl-msm.h
>
> diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
> index 33f9dc1..d0b6846 100644
> --- a/drivers/pinctrl/Kconfig
> +++ b/drivers/pinctrl/Kconfig
> @@ -202,6 +202,12 @@ config PINCTRL_IMX28
> bool
> select PINCTRL_MXS
>
> +config PINCTRL_MSM
> + bool
Why not tristate?
> + select PINMUX
> + select PINCONF
> + select GENERIC_PINCONF
> +
> config PINCTRL_NOMADIK
> bool "Nomadik pin controller driver"
> depends on ARCH_U8500 || ARCH_NOMADIK
> diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
> index 4f7be29..a525f8b 100644
> --- a/drivers/pinctrl/Makefile
> +++ b/drivers/pinctrl/Makefile
> @@ -35,6 +35,7 @@ obj-$(CONFIG_PINCTRL_FALCON) += pinctrl-falcon.o
> obj-$(CONFIG_PINCTRL_MXS) += pinctrl-mxs.o
> obj-$(CONFIG_PINCTRL_IMX23) += pinctrl-imx23.o
> obj-$(CONFIG_PINCTRL_IMX28) += pinctrl-imx28.o
> +obj-$(CONFIG_PINCTRL_MSM) += pinctrl-msm.o
> obj-$(CONFIG_PINCTRL_NOMADIK) += pinctrl-nomadik.o
> obj-$(CONFIG_PINCTRL_STN8815) += pinctrl-nomadik-stn8815.o
> obj-$(CONFIG_PINCTRL_DB8500) += pinctrl-nomadik-db8500.o
> diff --git a/drivers/pinctrl/pinctrl-msm.c b/drivers/pinctrl/pinctrl-msm.c
> new file mode 100644
> index 0000000..28b90ab
> --- /dev/null
> +++ b/drivers/pinctrl/pinctrl-msm.c
> @@ -0,0 +1,1028 @@
> +/*
> + * Copyright (c) 2013, Sony Mobile Communications AB.
> + * Copyright (c) 2013, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/irqdomain.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/pinctrl/machine.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/pinconf-generic.h>
> +#include <linux/slab.h>
> +#include <linux/gpio.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/of_irq.h>
> +#include <linux/spinlock.h>
> +
> +#include "core.h"
> +#include "pinconf.h"
> +#include "pinctrl-msm.h"
> +#include "pinctrl-utils.h"
> +
> +/**
> + * struct msm_pinctrl - state for a pinctrl-msm device
> + * @dev: device handle.
> + * @pctrl: pinctrl handle.
> + * @domain: irqdomain handle.
> + * @chip: gpiochip handle.
> + * @irq: parent irq for the TLMM irq_chip.
> + * @lock: Spinlock to protect register resources as well
> + * as msm_pinctrl data structures.
> + * @enabled_irqs: Bitmap of currently enabled irqs.
> + * @dual_edge_irqs: Bitmap of irqs that need sw emulated dual edge
> + * detection.
> + * @wake_irqs: Bitmap of irqs with requested as wakeup source.
> + * @soc; Reference to soc_data of platform specific data.
> + * @regs: Base address for the TLMM register map.
> + */
> +struct msm_pinctrl {
> + struct device *dev;
> + struct pinctrl_dev *pctrl;
> + struct irq_domain *domain;
> + struct gpio_chip chip;
> + unsigned irq;
> +
> + spinlock_t lock;
> +
> + unsigned long *enabled_irqs;
> + unsigned long *dual_edge_irqs;
> + unsigned long *wake_irqs;
In the gpio driver we went with a static upper limit on the bitmap. That
allowed us to avoid small allocations fragmenting the heap. Please do
the same here (look at gpio-msm-v2.c).
> +
> + const struct msm_pinctrl_soc_data *soc;
> + void __iomem *regs;
> +};
> +
> +static int msm_get_groups_count(struct pinctrl_dev *pctldev)
> +{
> + struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +
> + return pctrl->soc->ngroups;
> +}
> +
> +static const char *msm_get_group_name(struct pinctrl_dev *pctldev,
> + unsigned group)
> +{
> + struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +
> + return pctrl->soc->groups[group].name;
> +}
> +
> +static int msm_get_group_pins(struct pinctrl_dev *pctldev,
> + unsigned group,
> + const unsigned **pins,
> + unsigned *num_pins)
> +{
> + struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +
> + *pins = pctrl->soc->groups[group].pins;
> + *num_pins = pctrl->soc->groups[group].npins;
> + return 0;
> +}
> +
> +static struct pinctrl_ops msm_pinctrl_ops = {
const?
> + .get_groups_count = msm_get_groups_count,
> + .get_group_name = msm_get_group_name,
> + .get_group_pins = msm_get_group_pins,
> + .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
> + .dt_free_map = pinctrl_utils_dt_free_map,
> +};
> +
> +static int msm_get_functions_count(struct pinctrl_dev *pctldev)
> +{
> + struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +
> + return pctrl->soc->nfunctions;
> +}
> +
> +static const char *msm_get_function_name(struct pinctrl_dev *pctldev,
> + unsigned function)
> +{
> + struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +
> + return pctrl->soc->functions[function].name;
> +}
> +
> +static int msm_get_function_groups(struct pinctrl_dev *pctldev,
> + unsigned function,
> + const char * const **groups,
> + unsigned * const num_groups)
> +{
> + struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +
> + *groups = pctrl->soc->functions[function].groups;
> + *num_groups = pctrl->soc->functions[function].ngroups;
> + return 0;
> +}
> +
> +static int msm_pinmux_enable(struct pinctrl_dev *pctldev,
> + unsigned function,
> + unsigned group)
> +{
> + struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> + const struct msm_pingroup *g;
> + unsigned long flags;
> + u32 val;
> + int i;
> +
> + g = &pctrl->soc->groups[group];
> +
> + if (WARN_ON(g->mux_bit < 0))
> + return -EINVAL;
> +
> + for (i = 0; i < ARRAY_SIZE(g->funcs); i++) {
> + if (g->funcs[i] == function)
> + break;
> + }
> +
> + if (WARN_ON(i == ARRAY_SIZE(g->funcs)))
> + return -EINVAL;
> +
> + spin_lock_irqsave(&pctrl->lock, flags);
> +
> + val = readl(pctrl->regs + g->ctl_reg);
> + val &= ~(0x7 << g->mux_bit);
> + val |= i << g->mux_bit;
> + writel(val, pctrl->regs + g->ctl_reg);
> +
> + spin_unlock_irqrestore(&pctrl->lock, flags);
> +
> + return 0;
> +}
> +
> +static void msm_pinmux_disable(struct pinctrl_dev *pctldev,
> + unsigned function,
> + unsigned group)
> +{
> + struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> + const struct msm_pingroup *g;
> + unsigned long flags;
> + u32 val;
> +
> + g = &pctrl->soc->groups[group];
> +
> + if (WARN_ON(g->mux_bit < 0))
> + return;
> +
> + spin_lock_irqsave(&pctrl->lock, flags);
> +
> + /* Clear the mux bits to select gpio mode */
> + val = readl(pctrl->regs + g->ctl_reg);
> + val &= ~(0x7 << g->mux_bit);
> + writel(val, pctrl->regs + g->ctl_reg);
> +
> + spin_unlock_irqrestore(&pctrl->lock, flags);
> +}
> +
> +static struct pinmux_ops msm_pinmux_ops = {
const?
> + .get_functions_count = msm_get_functions_count,
> + .get_function_name = msm_get_function_name,
> + .get_function_groups = msm_get_function_groups,
> + .enable = msm_pinmux_enable,
> + .disable = msm_pinmux_disable,
> +};
> +
> +static int msm_config_reg(struct msm_pinctrl *pctrl,
> + const struct msm_pingroup *g,
> + unsigned param,
> + unsigned *reg,
> + unsigned *mask,
> + unsigned *bit)
> +{
> + switch (param) {
> + case PIN_CONFIG_BIAS_DISABLE:
> + *reg = g->ctl_reg;
> + *bit = g->pull_bit;
> + *mask = 3;
> + break;
> + case PIN_CONFIG_BIAS_PULL_DOWN:
> + *reg = g->ctl_reg;
> + *bit = g->pull_bit;
> + *mask = 3;
> + break;
> + case PIN_CONFIG_BIAS_PULL_UP:
> + *reg = g->ctl_reg;
> + *bit = g->pull_bit;
> + *mask = 3;
> + break;
> + case PIN_CONFIG_DRIVE_STRENGTH:
> + *reg = g->ctl_reg;
> + *bit = g->drv_bit;
> + *mask = 7;
> + break;
> + default:
> + dev_err(pctrl->dev, "Invalid config param %04x\n", param);
> + return -ENOTSUPP;
> + }
> +
> + if (*reg < 0) {
> + dev_err(pctrl->dev, "Config param %04x not supported on group %s\n",
> + param, g->name);
> + return -ENOTSUPP;
> + }
> +
> + return 0;
> +}
> +
> +static int msm_config_get(struct pinctrl_dev *pctldev,
> + unsigned int pin,
> + unsigned long *config)
> +{
> + dev_err(pctldev->dev, "pin_config_set op not supported\n");
> + return -ENOTSUPP;
> +}
> +
> +static int msm_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
> + unsigned long *configs, unsigned num_configs)
> +{
> + dev_err(pctldev->dev, "pin_config_set op not supported\n");
> + return -ENOTSUPP;
> +}
> +
> +#define MSM_NO_PULL 0
> +#define MSM_PULL_DOWN 1
> +#define MSM_PULL_UP 3
> +
> +static const unsigned msm_regval_to_drive[] = { 2, 4, 6, 8, 10, 12, 14, 16 };
> +static const unsigned msm_drive_to_regval[] = { -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, 4, -1, 5, -1, 6, -1, 7 };
> +
> +static int msm_config_group_get(struct pinctrl_dev *pctldev,
> + unsigned int group,
> + unsigned long *config)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> + unsigned param = pinconf_to_config_param(*config);
> + unsigned mask;
> + unsigned arg;
> + unsigned bit;
> + unsigned reg;
> + int ret;
> + u32 val;
> +
> + g = &pctrl->soc->groups[group];
> +
> + ret = msm_config_reg(pctrl, g, param, ®, &mask, &bit);
> + if (ret < 0)
> + return ret;
> +
> + val = readl(pctrl->regs + reg);
> + arg = (val >> bit) & mask;
> +
> + /* Convert register value to pinconf value */
> + switch (param) {
> + case PIN_CONFIG_BIAS_DISABLE:
> + arg = arg == MSM_NO_PULL;
> + break;
> + case PIN_CONFIG_BIAS_PULL_DOWN:
> + arg = arg == MSM_PULL_DOWN;
> + break;
> + case PIN_CONFIG_BIAS_PULL_UP:
> + arg = arg == MSM_PULL_UP;
> + break;
> + case PIN_CONFIG_DRIVE_STRENGTH:
> + arg = msm_regval_to_drive[arg];
> + break;
> + default:
> + dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
> + param);
> + return -EINVAL;
> + }
> +
> + *config = pinconf_to_config_packed(param, arg);
> +
> + return 0;
> +}
> +
> +static int msm_config_group_set(struct pinctrl_dev *pctldev,
> + unsigned group,
> + unsigned long *configs,
> + unsigned num_configs)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> + unsigned long flags;
> + unsigned param;
> + unsigned mask;
> + unsigned arg;
> + unsigned bit;
> + unsigned reg;
> + int ret;
> + u32 val;
> + int i;
> +
> + g = &pctrl->soc->groups[group];
> +
> + for (i = 0; i < num_configs; i++) {
> + param = pinconf_to_config_param(configs[i]);
> + arg = pinconf_to_config_argument(configs[i]);
> +
> + ret = msm_config_reg(pctrl, g, param, ®, &mask, &bit);
> + if (ret < 0)
> + return ret;
> +
> + /* Convert pinconf values to register values */
> + switch (param) {
> + case PIN_CONFIG_BIAS_DISABLE:
> + arg = MSM_NO_PULL;
> + break;
> + case PIN_CONFIG_BIAS_PULL_DOWN:
> + arg = MSM_PULL_DOWN;
> + break;
> + case PIN_CONFIG_BIAS_PULL_UP:
> + arg = MSM_PULL_UP;
> + break;
> + case PIN_CONFIG_DRIVE_STRENGTH:
> + /* Check for invalid values */
> + if (arg > ARRAY_SIZE(msm_drive_to_regval))
> + arg = -1;
> + else
> + arg = msm_drive_to_regval[arg];
> + break;
> + default:
> + dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
> + param);
> + return -EINVAL;
> + }
> +
> + /* Range-check user-supplied value */
> + if (arg & ~mask) {
> + dev_err(pctrl->dev, "config %x: %x is invalid\n", param, arg);
> + return -EINVAL;
> + }
> +
> + spin_lock_irqsave(&pctrl->lock, flags);
> + val = readl(pctrl->regs + reg);
> + val &= ~(mask << bit);
> + val |= arg << bit;
> + writel(val, pctrl->regs + reg);
> + spin_unlock_irqrestore(&pctrl->lock, flags);
> + }
> +
> + return 0;
> +}
> +
> +static struct pinconf_ops msm_pinconf_ops = {
const?
> + .pin_config_get = msm_config_get,
> + .pin_config_set = msm_config_set,
> + .pin_config_group_get = msm_config_group_get,
> + .pin_config_group_set = msm_config_group_set,
> +};
> +
> +static struct pinctrl_desc msm_pinctrl_desc = {
> + .pctlops = &msm_pinctrl_ops,
> + .pmxops = &msm_pinmux_ops,
> + .confops = &msm_pinconf_ops,
> + .owner = THIS_MODULE,
> +};
> +
> +static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
> + unsigned long flags;
> + u32 val;
> +
> + if (WARN_ON(offset >= pctrl->soc->ngroups))
> + return -EINVAL;
> +
> + g = &pctrl->soc->groups[offset];
> +
> + if (WARN_ON(g->oe_bit < 0))
> + return -EINVAL;
> +
> + spin_lock_irqsave(&pctrl->lock, flags);
> +
> + val = readl(pctrl->regs + g->ctl_reg);
> + val &= ~BIT(g->oe_bit);
> + writel(val, pctrl->regs + g->ctl_reg);
> +
> + spin_unlock_irqrestore(&pctrl->lock, flags);
> +
> + return 0;
> +}
> +
> +static int msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
> + unsigned long flags;
> + u32 val;
> +
> + if (WARN_ON(offset >= pctrl->soc->ngroups))
> + return -EINVAL;
How is this possible?
> +
> + g = &pctrl->soc->groups[offset];
> +
> + if (WARN_ON(g->oe_bit < 0))
> + return -EINVAL;
> +
> + spin_lock_irqsave(&pctrl->lock, flags);
> +
> + writel(value ? BIT(g->out_bit) : 0, pctrl->regs + g->io_reg);
> +
> + val = readl(pctrl->regs + g->ctl_reg);
> + val |= BIT(g->oe_bit);
> + writel(val, pctrl->regs + g->ctl_reg);
> +
> + spin_unlock_irqrestore(&pctrl->lock, flags);
> +
> + return 0;
> +}
> +
> +static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
> + u32 val;
> +
> + if (WARN_ON(offset >= pctrl->soc->ngroups))
> + return -EINVAL;
> +
> + g = &pctrl->soc->groups[offset];
> +
> + val = readl(pctrl->regs + g->io_reg);
> + return !!(val & BIT(g->in_bit));
> +}
> +
> +static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
> + unsigned long flags;
> + u32 val;
> +
> + if (WARN_ON(offset >= pctrl->soc->ngroups))
> + return;
> +
> + g = &pctrl->soc->groups[offset];
> +
> + spin_lock_irqsave(&pctrl->lock, flags);
> +
> + val = readl(pctrl->regs + g->io_reg);
> + val |= BIT(g->out_bit);
> + writel(val, pctrl->regs + g->io_reg);
> +
> + spin_unlock_irqrestore(&pctrl->lock, flags);
> +}
> +
> +static int msm_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
> +{
> + struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
> +
> + return irq_find_mapping(pctrl->domain, offset);
> +}
> +
> +static int msm_gpio_request(struct gpio_chip *chip, unsigned offset)
> +{
> + int gpio = chip->base + offset;
> + return pinctrl_request_gpio(gpio);
> +}
> +
> +static void msm_gpio_free(struct gpio_chip *chip, unsigned offset)
> +{
> + int gpio = chip->base + offset;
> + return pinctrl_free_gpio(gpio);
> +}
> +
> +#ifdef CONFIG_DEBUG_FS
> +#include <linux/seq_file.h>
> +
> +static void msm_gpio_dbg_show_one(struct seq_file *s,
> + struct pinctrl_dev *pctldev,
> + struct gpio_chip *chip,
> + unsigned offset,
> + unsigned gpio)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
> + unsigned func;
> + int is_out;
> + int drive;
> + int pull;
> + u32 ctl_reg;
> +
> + const char *pulls[] = {
static const char * const ?
> + "no pull",
> + "pull down",
> + "keeper",
> + "pull up"
> + };
> +
> + g = &pctrl->soc->groups[offset];
> + ctl_reg = readl(pctrl->regs + g->ctl_reg);
> +
> + is_out = !!(ctl_reg & BIT(g->oe_bit));
> + func = (ctl_reg >> g->mux_bit) & 7;
> + drive = (ctl_reg >> g->drv_bit) & 7;
> + pull = (ctl_reg >> g->pull_bit) & 3;
> +
> + seq_printf(s, " %-8s: %-3s %d", g->name, is_out ? "out" : "in", func);
> + seq_printf(s, " %dmA", msm_regval_to_drive[drive]);
> + seq_printf(s, " %s", pulls[pull]);
> +}
> +
> +static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
> +{
> + unsigned gpio = chip->base;
> + unsigned i;
> +
> + for (i = 0; i < chip->ngpio; i++, gpio++) {
> + msm_gpio_dbg_show_one(s, NULL, chip, i, gpio);
> + seq_printf(s, "\n");
seq_puts()?
> + }
> +}
> +
> +#else
> +#define msm_gpio_dbg_show NULL
> +#endif
> +
> +static struct gpio_chip msm_gpio_template = {
> + .direction_input = msm_gpio_direction_input,
> + .direction_output = msm_gpio_direction_output,
> + .get = msm_gpio_get,
> + .set = msm_gpio_set,
> + .to_irq = msm_gpio_to_irq,
> + .request = msm_gpio_request,
> + .free = msm_gpio_free,
> + .dbg_show = msm_gpio_dbg_show,
> +};
> +
> +/* For dual-edge interrupts in software, since some hardware has no
> + * such support:
> + *
> + * At appropriate moments, this function may be called to flip the polarity
> + * settings of both-edge irq lines to try and catch the next edge.
> + *
> + * The attempt is considered successful if:
> + * - the status bit goes high, indicating that an edge was caught, or
> + * - the input value of the gpio doesn't change during the attempt.
> + * If the value changes twice during the process, that would cause the first
> + * test to fail but would force the second, as two opposite
> + * transitions would cause a detection no matter the polarity setting.
> + *
> + * The do-loop tries to sledge-hammer closed the timing hole between
> + * the initial value-read and the polarity-write - if the line value changes
> + * during that window, an interrupt is lost, the new polarity setting is
> + * incorrect, and the first success test will fail, causing a retry.
> + *
> + * Algorithm comes from Google's msmgpio driver.
> + */
> +static void msm_gpio_update_dual_edge_pos(struct msm_pinctrl *pctrl,
> + const struct msm_pingroup *g,
> + struct irq_data *d)
> +{
> + int loop_limit = 100;
> + unsigned val, val2, intstat;
> + unsigned pol;
> +
> + do {
> + val = readl(pctrl->regs + g->io_reg) & BIT(g->in_bit);
> +
> + pol = readl(pctrl->regs + g->intr_cfg_reg);
> + pol ^= BIT(g->intr_polarity_bit);
> + writel(pol, pctrl->regs + g->intr_cfg_reg);
> +
> + val2 = readl(pctrl->regs + g->io_reg) & BIT(g->in_bit);
> + intstat = readl(pctrl->regs + g->intr_status_reg);
> + if (intstat || (val == val2))
> + return;
> + } while (loop_limit-- > 0);
> + dev_err(pctrl->dev, "dual-edge irq failed to stabilize, %#08x != %#08x\n",
> + val, val2);
> +}
> +
> +static void msm_gpio_irq_mask(struct irq_data *d)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl;
> + unsigned long flags;
> + u32 val;
> +
> + pctrl = irq_data_get_irq_chip_data(d);
> + if (!pctrl)
> + return;
> +
> + if (WARN_ON(d->hwirq >= pctrl->soc->ngroups))
> + return;
> +
> + g = &pctrl->soc->groups[d->hwirq];
> +
> + spin_lock_irqsave(&pctrl->lock, flags);
> +
> + val = readl(pctrl->regs + g->intr_cfg_reg);
> + val &= ~BIT(g->intr_enable_bit);
> + writel(val, pctrl->regs + g->intr_cfg_reg);
> +
> + clear_bit(d->hwirq, pctrl->enabled_irqs);
> +
> + spin_unlock_irqrestore(&pctrl->lock, flags);
> +}
> +
> +static void msm_gpio_irq_unmask(struct irq_data *d)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl;
> + unsigned long flags;
> + u32 val;
> +
> + pctrl = irq_data_get_irq_chip_data(d);
> + if (!pctrl)
> + return;
> +
> + if (WARN_ON(d->hwirq >= pctrl->soc->ngroups))
> + return;
> +
> + g = &pctrl->soc->groups[d->hwirq];
> +
> + spin_lock_irqsave(&pctrl->lock, flags);
> +
> + val = readl(pctrl->regs + g->intr_status_reg);
> + val &= ~BIT(g->intr_status_bit);
> + writel(val, pctrl->regs + g->intr_status_reg);
> +
> + val = readl(pctrl->regs + g->intr_cfg_reg);
> + val |= BIT(g->intr_enable_bit);
> + writel(val, pctrl->regs + g->intr_cfg_reg);
> +
> + set_bit(d->hwirq, pctrl->enabled_irqs);
> +
> + spin_unlock_irqrestore(&pctrl->lock, flags);
> +}
> +
> +static void msm_gpio_irq_ack(struct irq_data *d)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl;
> + unsigned long flags;
> + u32 val;
> +
> + pctrl = irq_data_get_irq_chip_data(d);
> + if (!pctrl)
> + return;
> +
> + if (WARN_ON(d->hwirq >= pctrl->soc->ngroups))
> + return;
> +
> + g = &pctrl->soc->groups[d->hwirq];
> +
> + spin_lock_irqsave(&pctrl->lock, flags);
> +
> + val = readl(pctrl->regs + g->intr_status_reg);
> + val &= ~BIT(g->intr_status_bit);
> + writel(val, pctrl->regs + g->intr_status_reg);
> +
> + if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
> + msm_gpio_update_dual_edge_pos(pctrl, g, d);
> +
> + spin_unlock_irqrestore(&pctrl->lock, flags);
> +}
> +
> +#define INTR_TARGET_PROC_APPS 4
> +
> +static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl;
> + unsigned long flags;
> + u32 val;
> +
> + pctrl = irq_data_get_irq_chip_data(d);
> + if (!pctrl)
> + return -EINVAL;
How is this possible?
> +
> + if (WARN_ON(d->hwirq >= pctrl->soc->ngroups))
> + return -EINVAL;
> +
> + g = &pctrl->soc->groups[d->hwirq];
> +
> + spin_lock_irqsave(&pctrl->lock, flags);
> +
> + /*
> + * For hw without possibility of detecting both edges
> + */
> + if (g->intr_detection_width == 1 && type == IRQ_TYPE_EDGE_BOTH)
> + set_bit(d->hwirq, pctrl->dual_edge_irqs);
> + else
> + clear_bit(d->hwirq, pctrl->dual_edge_irqs);
> +
> + /* Route interrupts to application cpu */
> + val = readl(pctrl->regs + g->intr_target_reg);
> + val &= ~(7 << g->intr_target_bit);
> + val |= INTR_TARGET_PROC_APPS << g->intr_target_bit;
> + writel(val, pctrl->regs + g->intr_target_reg);
> +
> + /* Update configuration for gpio.
> + * RAW_STATUS_EN is left on for all gpio irqs. Due to the
> + * internal circuitry of TLMM, toggling the RAW_STATUS
> + * could cause the INTR_STATUS to be set for EDGE interrupts.
> + */
> + val = readl(pctrl->regs + g->intr_cfg_reg);
> + val |= BIT(g->intr_raw_status_bit);
> + if (g->intr_detection_width == 2) {
> + val &= ~(3 << g->intr_detection_bit);
> + val &= ~(1 << g->intr_polarity_bit);
> + switch (type) {
> + case IRQ_TYPE_EDGE_RISING:
> + val |= 1 << g->intr_detection_bit;
> + val |= BIT(g->intr_polarity_bit);
> + break;
> + case IRQ_TYPE_EDGE_FALLING:
> + val |= 2 << g->intr_detection_bit;
> + val |= BIT(g->intr_polarity_bit);
> + break;
> + case IRQ_TYPE_EDGE_BOTH:
> + val |= 3 << g->intr_detection_bit;
> + val |= BIT(g->intr_polarity_bit);
> + break;
> + case IRQ_TYPE_LEVEL_LOW:
> + break;
> + case IRQ_TYPE_LEVEL_HIGH:
> + val |= BIT(g->intr_polarity_bit);
> + break;
> + }
> + } else if (g->intr_detection_width == 1) {
> + val &= ~(1 << g->intr_detection_bit);
> + val &= ~(1 << g->intr_polarity_bit);
> + switch (type) {
> + case IRQ_TYPE_EDGE_RISING:
> + val |= BIT(g->intr_detection_bit);
> + val |= BIT(g->intr_polarity_bit);
> + break;
> + case IRQ_TYPE_EDGE_FALLING:
> + val |= BIT(g->intr_detection_bit);
> + break;
> + case IRQ_TYPE_EDGE_BOTH:
> + val |= BIT(g->intr_detection_bit);
> + break;
> + case IRQ_TYPE_LEVEL_LOW:
> + break;
> + case IRQ_TYPE_LEVEL_HIGH:
> + val |= BIT(g->intr_polarity_bit);
> + break;
> + }
> + } else {
> + BUG();
> + }
This would be better written as a collection of ifs so that
IRQ_TYPE_EDGE_BOTH doesn't have to be tested and we duplicate less code.
> + writel(val, pctrl->regs + g->intr_cfg_reg);
> +
> + if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
> + msm_gpio_update_dual_edge_pos(pctrl, g, d);
> +
> + spin_unlock_irqrestore(&pctrl->lock, flags);
> +
> + if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
> + __irq_set_handler_locked(d->irq, handle_level_irq);
> + else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
> + __irq_set_handler_locked(d->irq, handle_edge_irq);
> +
> + return 0;
> +}
> +
> +static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
> +{
> + struct msm_pinctrl *pctrl;
> + unsigned long flags;
> + unsigned ngpio;
> +
> + pctrl = irq_data_get_irq_chip_data(d);
> + if (!pctrl)
> + return -EINVAL;
> +
> + ngpio = pctrl->chip.ngpio;
> +
> + spin_lock_irqsave(&pctrl->lock, flags);
> +
> + if (on) {
> + if (bitmap_empty(pctrl->wake_irqs, ngpio))
> + enable_irq_wake(pctrl->irq);
> + set_bit(d->hwirq, pctrl->wake_irqs);
> + } else {
> + clear_bit(d->hwirq, pctrl->wake_irqs);
> + if (bitmap_empty(pctrl->wake_irqs, ngpio))
> + disable_irq_wake(pctrl->irq);
> + }
> +
> + spin_unlock_irqrestore(&pctrl->lock, flags);
> +
> + return 0;
> +}
> +
> +static unsigned int msm_gpio_irq_startup(struct irq_data *d)
> +{
> + struct msm_pinctrl *pctrl = irq_data_get_irq_chip_data(d);
> +
> + if (gpio_lock_as_irq(&pctrl->chip, d->hwirq)) {
> + dev_err(pctrl->dev, "unable to lock HW IRQ %lu for IRQ\n",
> + d->hwirq);
> + }
> + msm_gpio_irq_unmask(d);
> + return 0;
> +}
> +
> +static void msm_gpio_irq_shutdown(struct irq_data *d)
> +{
> + struct msm_pinctrl *pctrl = irq_data_get_irq_chip_data(d);
> +
> + msm_gpio_irq_mask(d);
> + gpio_unlock_as_irq(&pctrl->chip, d->hwirq);
> +}
> +
> +static struct irq_chip msm_gpio_irq_chip = {
> + .name = "msmgpio",
> + .irq_mask = msm_gpio_irq_mask,
> + .irq_unmask = msm_gpio_irq_unmask,
> + .irq_ack = msm_gpio_irq_ack,
> + .irq_set_type = msm_gpio_irq_set_type,
> + .irq_set_wake = msm_gpio_irq_set_wake,
> + .irq_startup = msm_gpio_irq_startup,
> + .irq_shutdown = msm_gpio_irq_shutdown,
> +};
> +
> +static void msm_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
> +{
> + const struct msm_pingroup *g;
> + struct msm_pinctrl *pctrl = irq_desc_get_handler_data(desc);
> + struct irq_chip *chip = irq_get_chip(irq);
> + int irq_pin;
> + int handled = 0;
> + u32 val;
> + int i;
> +
> + chained_irq_enter(chip, desc);
> +
> + /*
> + * Each pin have it's own IRQ status register, so use
s/have/has/
> + * enabled_irq bitmap to limit the number of reads.
> + */
> + for_each_set_bit(i, pctrl->enabled_irqs, pctrl->chip.ngpio) {
> + g = &pctrl->soc->groups[i];
> + val = readl(pctrl->regs + g->intr_status_reg);
> + if (val & BIT(g->intr_status_bit)) {
> + irq_pin = irq_find_mapping(pctrl->domain, i);
> + generic_handle_irq(irq_pin);
> + handled++;
> + }
> + }
> +
> + /* No interrutps where flagged */
s/where/were/
s/interrutps/interrupts/
> + if (handled == 0)
> + handle_bad_irq(irq, desc);
> +
> + chained_irq_exit(chip, desc);
> +}
> +
> +static int msm_gpio_init(struct msm_pinctrl *pctrl)
> +{
> + struct gpio_chip *chip;
> + int irq;
> + int ret;
> + int i;
> + int r;
> +
> + chip = &pctrl->chip;
> + chip->base = 0;
> + chip->ngpio = pctrl->soc->ngpios;
> + chip->label = dev_name(pctrl->dev);
> + chip->dev = pctrl->dev;
> + chip->owner = THIS_MODULE;
> + chip->of_node = pctrl->dev->of_node;
> +
> + pctrl->enabled_irqs = devm_kzalloc(pctrl->dev,
> + sizeof(unsigned long) * BITS_TO_LONGS(chip->ngpio),
> + GFP_KERNEL);
If you don't agree with how gpio-msm-v2.c does it, please use
devm_kcalloc().
> + if (!pctrl->enabled_irqs) {
> + dev_err(pctrl->dev, "Failed to allocate enabled_irqs bitmap\n");
> + return -ENOMEM;
> + }
> +
> + pctrl->dual_edge_irqs = devm_kzalloc(pctrl->dev,
> + sizeof(unsigned long) * BITS_TO_LONGS(chip->ngpio),
> + GFP_KERNEL);
> + if (!pctrl->dual_edge_irqs) {
> + dev_err(pctrl->dev, "Failed to allocate dual_edge_irqs bitmap\n");
> + return -ENOMEM;
> + }
> +
> + pctrl->wake_irqs = devm_kzalloc(pctrl->dev,
> + sizeof(unsigned long) * BITS_TO_LONGS(chip->ngpio),
> + GFP_KERNEL);
> + if (!pctrl->wake_irqs) {
> + dev_err(pctrl->dev, "Failed to allocate wake_irqs bitmap\n");
> + return -ENOMEM;
> + }
> +
> + ret = gpiochip_add(&pctrl->chip);
> + if (ret) {
> + dev_err(pctrl->dev, "Failed register gpiochip\n");
> + return ret;
> + }
> +
> + ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), 0, 0, chip->ngpio);
> + if (ret) {
> + dev_err(pctrl->dev, "Failed to add pin range\n");
> + return ret;
> + }
> +
> + pctrl->domain = irq_domain_add_linear(pctrl->dev->of_node, chip->ngpio,
> + &irq_domain_simple_ops, NULL);
> + if (!pctrl->domain) {
> + dev_err(pctrl->dev, "Failed to register irq domain\n");
> + r = gpiochip_remove(&pctrl->chip);
> + return -ENOSYS;
> + }
> +
> + for (i = 0; i < chip->ngpio; i++) {
> + irq = irq_create_mapping(pctrl->domain, i);
> + irq_set_chip_and_handler(irq, &msm_gpio_irq_chip, handle_edge_irq);
> + irq_set_chip_data(irq, pctrl);
> + }
> +
> + irq_set_handler_data(pctrl->irq, pctrl);
> + irq_set_chained_handler(pctrl->irq, msm_gpio_irq_handler);
> +
> + return 0;
> +}
> +
> +int msm_pinctrl_probe(struct platform_device *pdev,
> + const struct msm_pinctrl_soc_data *soc_data)
> +{
> + struct msm_pinctrl *pctrl;
> + struct resource *res;
> + int ret;
> +
> + pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
> + if (!pctrl) {
> + dev_err(&pdev->dev, "Can't allocate msm_pinctrl\n");
> + return -ENOMEM;
> + }
> + pctrl->dev = &pdev->dev;
> + pctrl->soc = soc_data;
> + pctrl->chip = msm_gpio_template;
> +
> + spin_lock_init(&pctrl->lock);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + pctrl->regs = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(pctrl->regs))
> + return PTR_ERR(pctrl->regs);
> +
> + pctrl->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
Why not use platform_get_irq()?
> + if (pctrl->irq < 0) {
> + dev_err(&pdev->dev, "No interrupt defined for msmgpio\n");
> + return pctrl->irq;
> + }
> +
> + msm_pinctrl_desc.name = dev_name(&pdev->dev);
> + msm_pinctrl_desc.pins = pctrl->soc->pins;
> + msm_pinctrl_desc.npins = pctrl->soc->npins;
> + pctrl->pctrl = pinctrl_register(&msm_pinctrl_desc, &pdev->dev, pctrl);
> + if (!pctrl->pctrl) {
> + dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
> + return -ENODEV;
> + }
> +
> + ret = msm_gpio_init(pctrl);
> + if (ret) {
> + pinctrl_unregister(pctrl->pctrl);
> + return ret;
> + }
> +
> + platform_set_drvdata(pdev, pctrl);
> +
> + dev_dbg(&pdev->dev, "Probed Qualcomm pinctrl driver\n");
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(msm_pinctrl_probe);
> +
> +int msm_pinctrl_remove(struct platform_device *pdev)
> +{
> + struct msm_pinctrl *pctrl = platform_get_drvdata(pdev);
> + int ret;
> +
> + irq_set_chained_handler(pctrl->irq, NULL);
> + irq_domain_remove(pctrl->domain);
> + ret = gpiochip_remove(&pctrl->chip);
> + pinctrl_unregister(pctrl->pctrl);
> +
> + return 0;
return ret?
> +}
> +EXPORT_SYMBOL(msm_pinctrl_remove);
> +
> diff --git a/drivers/pinctrl/pinctrl-msm.h b/drivers/pinctrl/pinctrl-msm.h
> new file mode 100644
> index 0000000..13b7463
> --- /dev/null
> +++ b/drivers/pinctrl/pinctrl-msm.h
> @@ -0,0 +1,123 @@
> +/*
> + * Copyright (c) 2013, Sony Mobile Communications AB.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +#ifndef __PINCTRL_MSM_H__
> +#define __PINCTRL_MSM_H__
> +
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/machine.h>
Are any of these includes actually necessary? Can't we just forward
declare struct pinctrl_pin_desc?
> +
>
> +struct msm_pingroup {
> + const char *name;
> + const unsigned *pins;
> + unsigned npins;
> +
> + unsigned funcs[8];
> +
> + s16 ctl_reg;
> + s16 io_reg;
> + s16 intr_cfg_reg;
> + s16 intr_status_reg;
> + s16 intr_target_reg;
Why are these signed? Because the macros assign -1 to them? Perhaps make
them unsigned and make the macro assign ~0U?
> +
> + unsigned mux_bit:5;
> +
> + unsigned pull_bit:5;
> + unsigned drv_bit:5;
> +
> + unsigned oe_bit:5;
> + unsigned in_bit:5;
> + unsigned out_bit:5;
> +
> + unsigned intr_enable_bit:5;
> + unsigned intr_status_bit:5;
> +
> + unsigned intr_target_bit:5;
> + unsigned intr_raw_status_bit:5;
> + unsigned intr_polarity_bit:5;
> + unsigned intr_detection_bit:5;
> + unsigned intr_detection_width:5;
> +};
> +
> +/**
> + * struct msm_pinctrl_soc_data - Qualcomm pin controller driver configuration
> + * @pins: An array describing all pins the pin controller affects.
> + * @npins: The number of entries in @pins.
> + * @functions: An array describing all mux functions the SoC supports.
> + * @nfunctions: The number of entries in @functions.
> + * @groups: An array describing all pin groups the pin SoC supports.
> + * @ngroups: The numbmer of entries in @groups.
> + * @ngpio: The number of pingroups the driver should expose as GPIOs.
> + */
> +struct msm_pinctrl_soc_data {
> + const struct pinctrl_pin_desc *pins;
> + unsigned npins;
> + const struct msm_function *functions;
> + unsigned nfunctions;
> + const struct msm_pingroup *groups;
> + unsigned ngroups;
> + unsigned ngpios;
> +};
> +
> +int msm_pinctrl_probe(struct platform_device *pdev,
> + const struct msm_pinctrl_soc_data *soc_data);
> +int msm_pinctrl_remove(struct platform_device *pdev);
> +
> +#endif
> +
--
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