e7692e2cfd
Documentation enhancement and code cleanup by Laurent Pinchart. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAABAgAGBQJRwvwkAAoJENfPZGlqN0++mukP/1+rldtrgijEKjqRLFFll2M1 3Z1FABTR7IywSzGvr2npBpmfPsa+w9Cmnn6BDTKUHjJYyurjiinumtDLH5oo6/Xb fXmhmco1huO0rnf9C84GysmDjDdSqYMs6wEaG2XjDcLPpYd6pLkb5/tl5bnTCoSt MW5kChypAVcrVflc2DMMU0cTtJ2joslOASHxlTXwCfgdG87R8iX2FtoPynKL9l3i pe0R8ASoZkxtGd4JT9PJyORq0PtACJB0z4Wm2V7wM8S/Cln4mDIl6NJc3VWCMnHp 2YRvSMhUDpKfhDrSnGFVHAhJBMuJQdVRHSxj0ZwDKQi9xeQr7lsfGa5bbb3a3pOr HYGz/eRkExIRWFw8rQ4YGoEAN6T7os5BTxxSTagRztZxRz5fD+yqQMGzv9/uIG9c iKOkGhrR0UPz4Ul8fo/C+uX8kvSfX4CpVozCBFOnszW0pMF/qIabsOVpJoAMOBsR q2YIyLkFxn/S97DK4xm/lyX1o3SBwIOeyCHb5KIlxFS6AVgOvxJwowjfQSaDbrP0 MIFxTSd4rkIt3kph6gT2cfJ6l8TbXs0bxtxWzOfu4UAVrwdc/HJzLUcSs++0s7Ca +Z48tjhuz3a8WPQgay1l8PoEaFXzvMaLNTMbG+Zfx9gVyWbmyk5r6VM7akXJqy2P cJA8purzFCEWjmk0od51 =tnz4 -----END PGP SIGNATURE----- Merge tag 'renesas-gpio-rcar2-for-v3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into next/drivers From Simon Horman: Second Round of Renesas ARM based SoC GPIO R-Car updates for v3.11 Documentation enhancement and code cleanup by Laurent Pinchart. * tag 'renesas-gpio-rcar2-for-v3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas: gpio-rcar: Remove #ifdef CONFIG_OF around OF-specific sections gpio-rcar: Reference core gpio documentation in the DT bindings Signed-off-by: Arnd Bergmann <arnd@arndb.de>
455 lines
12 KiB
C
455 lines
12 KiB
C
/*
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* Renesas R-Car GPIO Support
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*
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* Copyright (C) 2013 Magnus Damm
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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
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/module.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_data/gpio-rcar.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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struct gpio_rcar_priv {
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void __iomem *base;
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spinlock_t lock;
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struct gpio_rcar_config config;
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struct platform_device *pdev;
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struct gpio_chip gpio_chip;
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struct irq_chip irq_chip;
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struct irq_domain *irq_domain;
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};
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#define IOINTSEL 0x00
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#define INOUTSEL 0x04
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#define OUTDT 0x08
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#define INDT 0x0c
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#define INTDT 0x10
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#define INTCLR 0x14
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#define INTMSK 0x18
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#define MSKCLR 0x1c
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#define POSNEG 0x20
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#define EDGLEVEL 0x24
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#define FILONOFF 0x28
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#define BOTHEDGE 0x4c
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#define RCAR_MAX_GPIO_PER_BANK 32
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static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs)
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{
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return ioread32(p->base + offs);
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}
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static inline void gpio_rcar_write(struct gpio_rcar_priv *p, int offs,
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u32 value)
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{
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iowrite32(value, p->base + offs);
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}
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static void gpio_rcar_modify_bit(struct gpio_rcar_priv *p, int offs,
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int bit, bool value)
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{
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u32 tmp = gpio_rcar_read(p, offs);
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if (value)
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tmp |= BIT(bit);
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else
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tmp &= ~BIT(bit);
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gpio_rcar_write(p, offs, tmp);
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}
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static void gpio_rcar_irq_disable(struct irq_data *d)
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{
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struct gpio_rcar_priv *p = irq_data_get_irq_chip_data(d);
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gpio_rcar_write(p, INTMSK, ~BIT(irqd_to_hwirq(d)));
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}
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static void gpio_rcar_irq_enable(struct irq_data *d)
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{
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struct gpio_rcar_priv *p = irq_data_get_irq_chip_data(d);
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gpio_rcar_write(p, MSKCLR, BIT(irqd_to_hwirq(d)));
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}
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static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p,
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unsigned int hwirq,
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bool active_high_rising_edge,
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bool level_trigger,
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bool both)
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{
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unsigned long flags;
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/* follow steps in the GPIO documentation for
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* "Setting Edge-Sensitive Interrupt Input Mode" and
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* "Setting Level-Sensitive Interrupt Input Mode"
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*/
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spin_lock_irqsave(&p->lock, flags);
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/* Configure postive or negative logic in POSNEG */
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gpio_rcar_modify_bit(p, POSNEG, hwirq, !active_high_rising_edge);
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/* Configure edge or level trigger in EDGLEVEL */
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gpio_rcar_modify_bit(p, EDGLEVEL, hwirq, !level_trigger);
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/* Select one edge or both edges in BOTHEDGE */
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if (p->config.has_both_edge_trigger)
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gpio_rcar_modify_bit(p, BOTHEDGE, hwirq, both);
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/* Select "Interrupt Input Mode" in IOINTSEL */
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gpio_rcar_modify_bit(p, IOINTSEL, hwirq, true);
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/* Write INTCLR in case of edge trigger */
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if (!level_trigger)
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gpio_rcar_write(p, INTCLR, BIT(hwirq));
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spin_unlock_irqrestore(&p->lock, flags);
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}
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static int gpio_rcar_irq_set_type(struct irq_data *d, unsigned int type)
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{
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struct gpio_rcar_priv *p = irq_data_get_irq_chip_data(d);
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unsigned int hwirq = irqd_to_hwirq(d);
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dev_dbg(&p->pdev->dev, "sense irq = %d, type = %d\n", hwirq, type);
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switch (type & IRQ_TYPE_SENSE_MASK) {
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case IRQ_TYPE_LEVEL_HIGH:
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gpio_rcar_config_interrupt_input_mode(p, hwirq, true, true,
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false);
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break;
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case IRQ_TYPE_LEVEL_LOW:
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gpio_rcar_config_interrupt_input_mode(p, hwirq, false, true,
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false);
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break;
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case IRQ_TYPE_EDGE_RISING:
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gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false,
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false);
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break;
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case IRQ_TYPE_EDGE_FALLING:
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gpio_rcar_config_interrupt_input_mode(p, hwirq, false, false,
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false);
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break;
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case IRQ_TYPE_EDGE_BOTH:
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if (!p->config.has_both_edge_trigger)
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return -EINVAL;
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gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false,
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true);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id)
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{
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struct gpio_rcar_priv *p = dev_id;
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u32 pending;
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unsigned int offset, irqs_handled = 0;
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while ((pending = gpio_rcar_read(p, INTDT))) {
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offset = __ffs(pending);
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gpio_rcar_write(p, INTCLR, BIT(offset));
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generic_handle_irq(irq_find_mapping(p->irq_domain, offset));
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irqs_handled++;
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}
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return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
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}
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static inline struct gpio_rcar_priv *gpio_to_priv(struct gpio_chip *chip)
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{
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return container_of(chip, struct gpio_rcar_priv, gpio_chip);
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}
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static void gpio_rcar_config_general_input_output_mode(struct gpio_chip *chip,
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unsigned int gpio,
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bool output)
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{
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struct gpio_rcar_priv *p = gpio_to_priv(chip);
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unsigned long flags;
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/* follow steps in the GPIO documentation for
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* "Setting General Output Mode" and
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* "Setting General Input Mode"
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*/
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spin_lock_irqsave(&p->lock, flags);
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/* Configure postive logic in POSNEG */
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gpio_rcar_modify_bit(p, POSNEG, gpio, false);
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/* Select "General Input/Output Mode" in IOINTSEL */
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gpio_rcar_modify_bit(p, IOINTSEL, gpio, false);
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/* Select Input Mode or Output Mode in INOUTSEL */
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gpio_rcar_modify_bit(p, INOUTSEL, gpio, output);
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spin_unlock_irqrestore(&p->lock, flags);
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}
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static int gpio_rcar_request(struct gpio_chip *chip, unsigned offset)
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{
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return pinctrl_request_gpio(chip->base + offset);
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}
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static void gpio_rcar_free(struct gpio_chip *chip, unsigned offset)
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{
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pinctrl_free_gpio(chip->base + offset);
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/* Set the GPIO as an input to ensure that the next GPIO request won't
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* drive the GPIO pin as an output.
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*/
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gpio_rcar_config_general_input_output_mode(chip, offset, false);
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}
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static int gpio_rcar_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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gpio_rcar_config_general_input_output_mode(chip, offset, false);
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return 0;
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}
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static int gpio_rcar_get(struct gpio_chip *chip, unsigned offset)
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{
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return (int)(gpio_rcar_read(gpio_to_priv(chip), INDT) & BIT(offset));
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}
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static void gpio_rcar_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct gpio_rcar_priv *p = gpio_to_priv(chip);
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unsigned long flags;
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spin_lock_irqsave(&p->lock, flags);
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gpio_rcar_modify_bit(p, OUTDT, offset, value);
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spin_unlock_irqrestore(&p->lock, flags);
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}
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static int gpio_rcar_direction_output(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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/* write GPIO value to output before selecting output mode of pin */
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gpio_rcar_set(chip, offset, value);
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gpio_rcar_config_general_input_output_mode(chip, offset, true);
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return 0;
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}
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static int gpio_rcar_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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return irq_create_mapping(gpio_to_priv(chip)->irq_domain, offset);
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}
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static int gpio_rcar_irq_domain_map(struct irq_domain *h, unsigned int virq,
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irq_hw_number_t hw)
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{
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struct gpio_rcar_priv *p = h->host_data;
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dev_dbg(&p->pdev->dev, "map hw irq = %d, virq = %d\n", (int)hw, virq);
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irq_set_chip_data(virq, h->host_data);
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irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq);
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set_irq_flags(virq, IRQF_VALID); /* kill me now */
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return 0;
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}
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static struct irq_domain_ops gpio_rcar_irq_domain_ops = {
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.map = gpio_rcar_irq_domain_map,
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};
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static void gpio_rcar_parse_pdata(struct gpio_rcar_priv *p)
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{
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struct gpio_rcar_config *pdata = p->pdev->dev.platform_data;
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struct device_node *np = p->pdev->dev.of_node;
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struct of_phandle_args args;
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int ret;
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if (pdata) {
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p->config = *pdata;
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} else if (IS_ENABLED(CONFIG_OF) && np) {
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ret = of_parse_phandle_with_args(np, "gpio-ranges",
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"#gpio-range-cells", 0, &args);
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p->config.number_of_pins = ret == 0 && args.args_count == 3
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? args.args[2]
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: RCAR_MAX_GPIO_PER_BANK;
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p->config.gpio_base = -1;
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}
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if (p->config.number_of_pins == 0 ||
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p->config.number_of_pins > RCAR_MAX_GPIO_PER_BANK) {
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dev_warn(&p->pdev->dev,
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"Invalid number of gpio lines %u, using %u\n",
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p->config.number_of_pins, RCAR_MAX_GPIO_PER_BANK);
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p->config.number_of_pins = RCAR_MAX_GPIO_PER_BANK;
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}
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}
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static int gpio_rcar_probe(struct platform_device *pdev)
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{
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struct gpio_rcar_priv *p;
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struct resource *io, *irq;
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struct gpio_chip *gpio_chip;
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struct irq_chip *irq_chip;
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const char *name = dev_name(&pdev->dev);
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int ret;
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p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
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if (!p) {
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dev_err(&pdev->dev, "failed to allocate driver data\n");
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ret = -ENOMEM;
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goto err0;
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}
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p->pdev = pdev;
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spin_lock_init(&p->lock);
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/* Get device configuration from DT node or platform data. */
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gpio_rcar_parse_pdata(p);
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platform_set_drvdata(pdev, p);
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io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!io || !irq) {
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dev_err(&pdev->dev, "missing IRQ or IOMEM\n");
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ret = -EINVAL;
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goto err0;
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}
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p->base = devm_ioremap_nocache(&pdev->dev, io->start,
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resource_size(io));
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if (!p->base) {
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dev_err(&pdev->dev, "failed to remap I/O memory\n");
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ret = -ENXIO;
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goto err0;
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}
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gpio_chip = &p->gpio_chip;
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gpio_chip->request = gpio_rcar_request;
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gpio_chip->free = gpio_rcar_free;
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gpio_chip->direction_input = gpio_rcar_direction_input;
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gpio_chip->get = gpio_rcar_get;
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gpio_chip->direction_output = gpio_rcar_direction_output;
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gpio_chip->set = gpio_rcar_set;
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gpio_chip->to_irq = gpio_rcar_to_irq;
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gpio_chip->label = name;
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gpio_chip->dev = &pdev->dev;
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gpio_chip->owner = THIS_MODULE;
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gpio_chip->base = p->config.gpio_base;
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gpio_chip->ngpio = p->config.number_of_pins;
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irq_chip = &p->irq_chip;
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irq_chip->name = name;
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irq_chip->irq_mask = gpio_rcar_irq_disable;
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irq_chip->irq_unmask = gpio_rcar_irq_enable;
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irq_chip->irq_enable = gpio_rcar_irq_enable;
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irq_chip->irq_disable = gpio_rcar_irq_disable;
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irq_chip->irq_set_type = gpio_rcar_irq_set_type;
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irq_chip->flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_SET_TYPE_MASKED;
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p->irq_domain = irq_domain_add_simple(pdev->dev.of_node,
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p->config.number_of_pins,
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p->config.irq_base,
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&gpio_rcar_irq_domain_ops, p);
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if (!p->irq_domain) {
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ret = -ENXIO;
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dev_err(&pdev->dev, "cannot initialize irq domain\n");
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goto err1;
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}
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if (devm_request_irq(&pdev->dev, irq->start,
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gpio_rcar_irq_handler, IRQF_SHARED, name, p)) {
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dev_err(&pdev->dev, "failed to request IRQ\n");
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ret = -ENOENT;
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goto err1;
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}
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ret = gpiochip_add(gpio_chip);
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if (ret) {
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dev_err(&pdev->dev, "failed to add GPIO controller\n");
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goto err1;
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}
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dev_info(&pdev->dev, "driving %d GPIOs\n", p->config.number_of_pins);
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/* warn in case of mismatch if irq base is specified */
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if (p->config.irq_base) {
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ret = irq_find_mapping(p->irq_domain, 0);
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if (p->config.irq_base != ret)
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dev_warn(&pdev->dev, "irq base mismatch (%u/%u)\n",
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p->config.irq_base, ret);
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}
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if (p->config.pctl_name) {
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ret = gpiochip_add_pin_range(gpio_chip, p->config.pctl_name, 0,
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gpio_chip->base, gpio_chip->ngpio);
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if (ret < 0)
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dev_warn(&pdev->dev, "failed to add pin range\n");
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}
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return 0;
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err1:
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irq_domain_remove(p->irq_domain);
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err0:
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return ret;
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}
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static int gpio_rcar_remove(struct platform_device *pdev)
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{
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struct gpio_rcar_priv *p = platform_get_drvdata(pdev);
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int ret;
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ret = gpiochip_remove(&p->gpio_chip);
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if (ret)
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return ret;
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irq_domain_remove(p->irq_domain);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id gpio_rcar_of_table[] = {
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{
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.compatible = "renesas,gpio-rcar",
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},
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{ },
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};
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MODULE_DEVICE_TABLE(of, gpio_rcar_of_table);
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#endif
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static struct platform_driver gpio_rcar_device_driver = {
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.probe = gpio_rcar_probe,
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.remove = gpio_rcar_remove,
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.driver = {
|
|
.name = "gpio_rcar",
|
|
.of_match_table = of_match_ptr(gpio_rcar_of_table),
|
|
}
|
|
};
|
|
|
|
module_platform_driver(gpio_rcar_device_driver);
|
|
|
|
MODULE_AUTHOR("Magnus Damm");
|
|
MODULE_DESCRIPTION("Renesas R-Car GPIO Driver");
|
|
MODULE_LICENSE("GPL v2");
|