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[69.109.179.158]) by smtp.gmail.com with ESMTPSA id l8-20020a4ab2c8000000b0035eb4e5a6cbsm5252065ooo.33.2022.07.18.13.56.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Jul 2022 13:56:59 -0700 (PDT) From: William Breathitt Gray To: linus.walleij@linaro.org, brgl@bgdev.pl Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, William Breathitt Gray , John Hentges , Jay Dolan Subject: [PATCH v3 5/6] gpio: 104-idi-48: Implement and utilize register structures Date: Fri, 15 Jul 2022 14:52:27 -0400 Message-Id: <300ea3f4c4b1ebc0ef934875fdefe9402ab1e9a4.1657907849.git.william.gray@linaro.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Reduce magic numbers and improve code readability by implementing and utilizing named register data structures. The 104-IDI-48 device features an Intel 8255 compatible GPIO interface, so the i8255 GPIO module is selected and utilized as well. Cc: John Hentges Cc: Jay Dolan Signed-off-by: William Breathitt Gray --- Changes in v3: - Include "gpio-i8255.h" instead of - Import I8255 symbol namespace - Consolidate 'lock' and 'ack_lock' into a single spinlock 'lock' synchronizing I/O as well as protecting irq_mask states drivers/gpio/Kconfig | 1 + drivers/gpio/gpio-104-idi-48.c | 141 ++++++++++++++------------------- 2 files changed, 60 insertions(+), 82 deletions(-) diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 1d4529c39dc6..253a03ee3fa4 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -868,6 +868,7 @@ config GPIO_104_IDI_48 depends on PC104 select ISA_BUS_API select GPIOLIB_IRQCHIP + select GPIO_I8255 help Enables GPIO support for the ACCES 104-IDI-48 family (104-IDI-48A, 104-IDI-48AC, 104-IDI-48B, 104-IDI-48BC). The base port addresses for diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c index 9521ece3ebef..380ab1221a66 100644 --- a/drivers/gpio/gpio-104-idi-48.c +++ b/drivers/gpio/gpio-104-idi-48.c @@ -6,7 +6,6 @@ * This driver supports the following ACCES devices: 104-IDI-48A, * 104-IDI-48AC, 104-IDI-48B, and 104-IDI-48BC. */ -#include #include #include #include @@ -20,6 +19,11 @@ #include #include #include +#include + +#include "gpio-i8255.h" + +MODULE_IMPORT_NS(I8255); #define IDI_48_EXTENT 8 #define MAX_NUM_IDI_48 max_num_isa_dev(IDI_48_EXTENT) @@ -33,21 +37,34 @@ static unsigned int irq[MAX_NUM_IDI_48]; module_param_hw_array(irq, uint, irq, NULL, 0); MODULE_PARM_DESC(irq, "ACCES 104-IDI-48 interrupt line numbers"); +/** + * struct idi_48_reg - device register structure + * @port0: Port 0 Inputs + * @unused: Unused + * @port1: Port 1 Inputs + * @irq: Read: IRQ Status Register/IRQ Clear + * Write: IRQ Enable/Disable + */ +struct idi_48_reg { + u8 port0[3]; + u8 unused; + u8 port1[3]; + u8 irq; +}; + /** * struct idi_48_gpio - GPIO device private data structure * @chip: instance of the gpio_chip * @lock: synchronization lock to prevent I/O race conditions - * @ack_lock: synchronization lock to prevent IRQ handler race conditions * @irq_mask: input bits affected by interrupts - * @base: base port address of the GPIO device + * @reg: I/O address offset for the device registers * @cos_enb: Change-Of-State IRQ enable boundaries mask */ struct idi_48_gpio { struct gpio_chip chip; - raw_spinlock_t lock; - spinlock_t ack_lock; + spinlock_t lock; unsigned char irq_mask[6]; - void __iomem *base; + struct idi_48_reg __iomem *reg; unsigned char cos_enb; }; @@ -64,42 +81,18 @@ static int idi_48_gpio_direction_input(struct gpio_chip *chip, unsigned offset) static int idi_48_gpio_get(struct gpio_chip *chip, unsigned offset) { struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip); - unsigned i; - static const unsigned int register_offset[6] = { 0, 1, 2, 4, 5, 6 }; - void __iomem *port_addr; - unsigned mask; - - for (i = 0; i < 48; i += 8) - if (offset < i + 8) { - port_addr = idi48gpio->base + register_offset[i / 8]; - mask = BIT(offset - i); - - return !!(ioread8(port_addr) & mask); - } + const void __iomem *const ppi = idi48gpio->reg; - /* The following line should never execute since offset < 48 */ - return 0; + return i8255_get(ppi, offset); } static int idi_48_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip); - unsigned long offset; - unsigned long gpio_mask; - static const size_t ports[] = { 0, 1, 2, 4, 5, 6 }; - void __iomem *port_addr; - unsigned long port_state; - - /* clear bits array to a clean slate */ - bitmap_zero(bits, chip->ngpio); + const void __iomem *const ppi = idi48gpio->reg; - for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) { - port_addr = idi48gpio->base + ports[offset / 8]; - port_state = ioread8(port_addr) & gpio_mask; - - bitmap_set_value8(bits, port_state, offset); - } + i8255_get_multiple(ppi, mask, bits, chip->ngpio); return 0; } @@ -113,30 +106,24 @@ static void idi_48_irq_mask(struct irq_data *data) struct gpio_chip *chip = irq_data_get_irq_chip_data(data); struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip); const unsigned offset = irqd_to_hwirq(data); - unsigned i; - unsigned mask; - unsigned boundary; + const unsigned long boundary = offset / 8; + const unsigned long mask = BIT(offset % 8); unsigned long flags; - for (i = 0; i < 48; i += 8) - if (offset < i + 8) { - mask = BIT(offset - i); - boundary = i / 8; - - idi48gpio->irq_mask[boundary] &= ~mask; + spin_lock_irqsave(&idi48gpio->lock, flags); - if (!idi48gpio->irq_mask[boundary]) { - idi48gpio->cos_enb &= ~BIT(boundary); + idi48gpio->irq_mask[boundary] &= ~mask; - raw_spin_lock_irqsave(&idi48gpio->lock, flags); + /* Exit early if there are still input lines with IRQ unmasked */ + if (idi48gpio->irq_mask[boundary]) + goto exit; - iowrite8(idi48gpio->cos_enb, idi48gpio->base + 7); + idi48gpio->cos_enb &= ~BIT(boundary); - raw_spin_unlock_irqrestore(&idi48gpio->lock, flags); - } + iowrite8(idi48gpio->cos_enb, &idi48gpio->reg->irq); - return; - } +exit: + spin_unlock_irqrestore(&idi48gpio->lock, flags); } static void idi_48_irq_unmask(struct irq_data *data) @@ -144,32 +131,27 @@ static void idi_48_irq_unmask(struct irq_data *data) struct gpio_chip *chip = irq_data_get_irq_chip_data(data); struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip); const unsigned offset = irqd_to_hwirq(data); - unsigned i; - unsigned mask; - unsigned boundary; + const unsigned long boundary = offset / 8; + const unsigned long mask = BIT(offset % 8); unsigned prev_irq_mask; unsigned long flags; - for (i = 0; i < 48; i += 8) - if (offset < i + 8) { - mask = BIT(offset - i); - boundary = i / 8; - prev_irq_mask = idi48gpio->irq_mask[boundary]; + spin_lock_irqsave(&idi48gpio->lock, flags); - idi48gpio->irq_mask[boundary] |= mask; + prev_irq_mask = idi48gpio->irq_mask[boundary]; - if (!prev_irq_mask) { - idi48gpio->cos_enb |= BIT(boundary); + idi48gpio->irq_mask[boundary] |= mask; - raw_spin_lock_irqsave(&idi48gpio->lock, flags); + /* Exit early if IRQ was already unmasked for this boundary */ + if (prev_irq_mask) + goto exit; - iowrite8(idi48gpio->cos_enb, idi48gpio->base + 7); + idi48gpio->cos_enb |= BIT(boundary); - raw_spin_unlock_irqrestore(&idi48gpio->lock, flags); - } + iowrite8(idi48gpio->cos_enb, &idi48gpio->reg->irq); - return; - } +exit: + spin_unlock_irqrestore(&idi48gpio->lock, flags); } static int idi_48_irq_set_type(struct irq_data *data, unsigned flow_type) @@ -200,17 +182,13 @@ static irqreturn_t idi_48_irq_handler(int irq, void *dev_id) unsigned long gpio; struct gpio_chip *const chip = &idi48gpio->chip; - spin_lock(&idi48gpio->ack_lock); - - raw_spin_lock(&idi48gpio->lock); - - cos_status = ioread8(idi48gpio->base + 7); + spin_lock(&idi48gpio->lock); - raw_spin_unlock(&idi48gpio->lock); + cos_status = ioread8(&idi48gpio->reg->irq); /* IRQ Status (bit 6) is active low (0 = IRQ generated by device) */ if (cos_status & BIT(6)) { - spin_unlock(&idi48gpio->ack_lock); + spin_unlock(&idi48gpio->lock); return IRQ_NONE; } @@ -228,7 +206,7 @@ static irqreturn_t idi_48_irq_handler(int irq, void *dev_id) } } - spin_unlock(&idi48gpio->ack_lock); + spin_unlock(&idi48gpio->lock); return IRQ_HANDLED; } @@ -250,8 +228,8 @@ static int idi_48_irq_init_hw(struct gpio_chip *gc) struct idi_48_gpio *const idi48gpio = gpiochip_get_data(gc); /* Disable IRQ by default */ - iowrite8(0, idi48gpio->base + 7); - ioread8(idi48gpio->base + 7); + iowrite8(0, &idi48gpio->reg->irq); + ioread8(&idi48gpio->reg->irq); return 0; } @@ -273,8 +251,8 @@ static int idi_48_probe(struct device *dev, unsigned int id) return -EBUSY; } - idi48gpio->base = devm_ioport_map(dev, base[id], IDI_48_EXTENT); - if (!idi48gpio->base) + idi48gpio->reg = devm_ioport_map(dev, base[id], IDI_48_EXTENT); + if (!idi48gpio->reg) return -ENOMEM; idi48gpio->chip.label = name; @@ -298,8 +276,7 @@ static int idi_48_probe(struct device *dev, unsigned int id) girq->handler = handle_edge_irq; girq->init_hw = idi_48_irq_init_hw; - raw_spin_lock_init(&idi48gpio->lock); - spin_lock_init(&idi48gpio->ack_lock); + spin_lock_init(&idi48gpio->lock); err = devm_gpiochip_add_data(dev, &idi48gpio->chip, idi48gpio); if (err) { -- 2.36.1