Release 4.14 drivers/gpio/gpio-thunderx.c

Directory: drivers/gpio
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2016, 2017 Cavium Inc.
 */

#include <linux/bitops.h>
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/spinlock.h>



#define GPIO_RX_DAT	0x0

#define GPIO_TX_SET	0x8

#define GPIO_TX_CLR	0x10

#define GPIO_CONST	0x90

#define  GPIO_CONST_GPIOS_MASK 0xff

#define GPIO_BIT_CFG	0x400

#define  GPIO_BIT_CFG_TX_OE		BIT(0)

#define  GPIO_BIT_CFG_PIN_XOR		BIT(1)

#define  GPIO_BIT_CFG_INT_EN		BIT(2)

#define  GPIO_BIT_CFG_INT_TYPE		BIT(3)

#define  GPIO_BIT_CFG_FIL_MASK		GENMASK(11, 4)

#define  GPIO_BIT_CFG_FIL_CNT_SHIFT	4

#define  GPIO_BIT_CFG_FIL_SEL_SHIFT	8

#define  GPIO_BIT_CFG_TX_OD		BIT(12)

#define  GPIO_BIT_CFG_PIN_SEL_MASK	GENMASK(25, 16)

#define GPIO_INTR	0x800

#define  GPIO_INTR_INTR			BIT(0)

#define  GPIO_INTR_INTR_W1S		BIT(1)

#define  GPIO_INTR_ENA_W1C		BIT(2)

#define  GPIO_INTR_ENA_W1S		BIT(3)

#define GPIO_2ND_BANK	0x1400


#define GLITCH_FILTER_400NS ((4u << GPIO_BIT_CFG_FIL_SEL_SHIFT) | \
                             (9u << GPIO_BIT_CFG_FIL_CNT_SHIFT))

struct thunderx_gpio;


struct thunderx_line {
	
struct thunderx_gpio	*txgpio;
	
unsigned int		line;
	
unsigned int		fil_bits;
};


struct thunderx_gpio {
	
struct gpio_chip	chip;
	
u8 __iomem		*register_base;
	
struct irq_domain	*irqd;
	
struct msix_entry	*msix_entries;	/* per line MSI-X */
	
struct thunderx_line	*line_entries;	/* per line irq info */
	
raw_spinlock_t		lock;
	
unsigned long		invert_mask[2];
	
unsigned long		od_mask[2];
	
int			base_msi;
};



static unsigned int bit_cfg_reg(unsigned int line)
{
	return 8 * line + GPIO_BIT_CFG;
}

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static unsigned int intr_reg(unsigned int line)
{
	return 8 * line + GPIO_INTR;
}

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static bool thunderx_gpio_is_gpio_nowarn(struct thunderx_gpio *txgpio,
					 unsigned int line)
{
	u64 bit_cfg = readq(txgpio->register_base + bit_cfg_reg(line));

	return (bit_cfg & GPIO_BIT_CFG_PIN_SEL_MASK) == 0;
}

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/*
 * Check (and WARN) that the pin is available for GPIO.  We will not
 * allow modification of the state of non-GPIO pins from this driver.
 */


static bool thunderx_gpio_is_gpio(struct thunderx_gpio *txgpio,
				  unsigned int line)
{
	bool rv = thunderx_gpio_is_gpio_nowarn(txgpio, line);

	WARN_RATELIMIT(!rv, "Pin %d not available for GPIO\n", line);

	return rv;
}

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static int thunderx_gpio_request(struct gpio_chip *chip, unsigned int line)
{
	struct thunderx_gpio *txgpio = gpiochip_get_data(chip);

	return thunderx_gpio_is_gpio(txgpio, line) ? 0 : -EIO;
}

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static int thunderx_gpio_dir_in(struct gpio_chip *chip, unsigned int line)
{
	struct thunderx_gpio *txgpio = gpiochip_get_data(chip);

	if (!thunderx_gpio_is_gpio(txgpio, line))
		return -EIO;

	raw_spin_lock(&txgpio->lock);
	clear_bit(line, txgpio->invert_mask);
	clear_bit(line, txgpio->od_mask);
	writeq(txgpio->line_entries[line].fil_bits,
	       txgpio->register_base + bit_cfg_reg(line));
	raw_spin_unlock(&txgpio->lock);
	return 0;
}

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static void thunderx_gpio_set(struct gpio_chip *chip, unsigned int line,
			      int value)
{
	struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
	int bank = line / 64;
	int bank_bit = line % 64;

	void __iomem *reg = txgpio->register_base +
		(bank * GPIO_2ND_BANK) + (value ? GPIO_TX_SET : GPIO_TX_CLR);

	writeq(BIT_ULL(bank_bit), reg);
}

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static int thunderx_gpio_dir_out(struct gpio_chip *chip, unsigned int line,
				 int value)
{
	struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
	u64 bit_cfg = txgpio->line_entries[line].fil_bits | GPIO_BIT_CFG_TX_OE;

	if (!thunderx_gpio_is_gpio(txgpio, line))
		return -EIO;

	raw_spin_lock(&txgpio->lock);

	thunderx_gpio_set(chip, line, value);

	if (test_bit(line, txgpio->invert_mask))
		bit_cfg |= GPIO_BIT_CFG_PIN_XOR;

	if (test_bit(line, txgpio->od_mask))
		bit_cfg |= GPIO_BIT_CFG_TX_OD;

	writeq(bit_cfg, txgpio->register_base + bit_cfg_reg(line));

	raw_spin_unlock(&txgpio->lock);
	return 0;
}

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static int thunderx_gpio_get_direction(struct gpio_chip *chip, unsigned int line)
{
	struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
	u64 bit_cfg;

	if (!thunderx_gpio_is_gpio_nowarn(txgpio, line))
		/*
                 * Say it is input for now to avoid WARNing on
                 * gpiochip_add_data().  We will WARN if someone
                 * requests it or tries to use it.
                 */
		return 1;

	bit_cfg = readq(txgpio->register_base + bit_cfg_reg(line));

	return !(bit_cfg & GPIO_BIT_CFG_TX_OE);
}

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static int thunderx_gpio_set_config(struct gpio_chip *chip,
				    unsigned int line,
				    unsigned long cfg)
{
	bool orig_invert, orig_od, orig_dat, new_invert, new_od;
	u32 arg, sel;
	u64 bit_cfg;
	int bank = line / 64;
	int bank_bit = line % 64;
	int ret = -ENOTSUPP;
	struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
	void __iomem *reg = txgpio->register_base + (bank * GPIO_2ND_BANK) + GPIO_TX_SET;

	if (!thunderx_gpio_is_gpio(txgpio, line))
		return -EIO;

	raw_spin_lock(&txgpio->lock);
	orig_invert = test_bit(line, txgpio->invert_mask);
	new_invert  = orig_invert;
	orig_od = test_bit(line, txgpio->od_mask);
	new_od = orig_od;
	orig_dat = ((readq(reg) >> bank_bit) & 1) ^ orig_invert;
	bit_cfg = readq(txgpio->register_base + bit_cfg_reg(line));
	switch (pinconf_to_config_param(cfg)) {
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		/*
                 * Weird, setting open-drain mode causes signal
                 * inversion.  Note this so we can compensate in the
                 * dir_out function.
                 */
		set_bit(line, txgpio->invert_mask);
		new_invert  = true;
		set_bit(line, txgpio->od_mask);
		new_od = true;
		ret = 0;
		break;
	case PIN_CONFIG_DRIVE_PUSH_PULL:
		clear_bit(line, txgpio->invert_mask);
		new_invert  = false;
		clear_bit(line, txgpio->od_mask);
		new_od  = false;
		ret = 0;
		break;
	case PIN_CONFIG_INPUT_DEBOUNCE:
		arg = pinconf_to_config_argument(cfg);
		if (arg > 1228) { /* 15 * 2^15 * 2.5nS maximum */
			ret = -EINVAL;
			break;
		}
		arg *= 400; /* scale to 2.5nS clocks. */
		sel = 0;
		while (arg > 15) {
			sel++;
			arg++; /* always round up */
			arg >>= 1;
		}
		txgpio->line_entries[line].fil_bits =
			(sel << GPIO_BIT_CFG_FIL_SEL_SHIFT) |
			(arg << GPIO_BIT_CFG_FIL_CNT_SHIFT);
		bit_cfg &= ~GPIO_BIT_CFG_FIL_MASK;
		bit_cfg |= txgpio->line_entries[line].fil_bits;
		writeq(bit_cfg, txgpio->register_base + bit_cfg_reg(line));
		ret = 0;
		break;
	default:
		break;
	}
	raw_spin_unlock(&txgpio->lock);

	/*
         * If currently output and OPEN_DRAIN changed, install the new
         * settings
         */
	if ((new_invert != orig_invert || new_od != orig_od) &&
	    (bit_cfg & GPIO_BIT_CFG_TX_OE))
		ret = thunderx_gpio_dir_out(chip, line, orig_dat ^ new_invert);

	return ret;
}

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static int thunderx_gpio_get(struct gpio_chip *chip, unsigned int line)
{
	struct thunderx_gpio *txgpio = gpiochip_get_data(chip);
	int bank = line / 64;
	int bank_bit = line % 64;
	u64 read_bits = readq(txgpio->register_base + (bank * GPIO_2ND_BANK) + GPIO_RX_DAT);
	u64 masked_bits = read_bits & BIT_ULL(bank_bit);

	if (test_bit(line, txgpio->invert_mask))
		return masked_bits == 0;
	else
		return masked_bits != 0;
}

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static void thunderx_gpio_set_multiple(struct gpio_chip *chip,
				       unsigned long *mask,
				       unsigned long *bits)
{
	int bank;
	u64 set_bits, clear_bits;
	struct thunderx_gpio *txgpio = gpiochip_get_data(chip);

	for (bank = 0; bank <= chip->ngpio / 64; bank++) {
		set_bits = bits[bank] & mask[bank];
		clear_bits = ~bits[bank] & mask[bank];
		writeq(set_bits, txgpio->register_base + (bank * GPIO_2ND_BANK) + GPIO_TX_SET);
		writeq(clear_bits, txgpio->register_base + (bank * GPIO_2ND_BANK) + GPIO_TX_CLR);
	}
}

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static void thunderx_gpio_irq_ack(struct irq_data *data)
{
	struct thunderx_line *txline = irq_data_get_irq_chip_data(data);

	writeq(GPIO_INTR_INTR,
	       txline->txgpio->register_base + intr_reg(txline->line));
}

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static void thunderx_gpio_irq_mask(struct irq_data *data)
{
	struct thunderx_line *txline = irq_data_get_irq_chip_data(data);

	writeq(GPIO_INTR_ENA_W1C,
	       txline->txgpio->register_base + intr_reg(txline->line));
}

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static void thunderx_gpio_irq_mask_ack(struct irq_data *data)
{
	struct thunderx_line *txline = irq_data_get_irq_chip_data(data);

	writeq(GPIO_INTR_ENA_W1C | GPIO_INTR_INTR,
	       txline->txgpio->register_base + intr_reg(txline->line));
}

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static void thunderx_gpio_irq_unmask(struct irq_data *data)
{
	struct thunderx_line *txline = irq_data_get_irq_chip_data(data);

	writeq(GPIO_INTR_ENA_W1S,
	       txline->txgpio->register_base + intr_reg(txline->line));
}

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static int thunderx_gpio_irq_set_type(struct irq_data *data,
				      unsigned int flow_type)
{
	struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
	struct thunderx_gpio *txgpio = txline->txgpio;
	u64 bit_cfg;

	irqd_set_trigger_type(data, flow_type);

	bit_cfg = txline->fil_bits | GPIO_BIT_CFG_INT_EN;

	if (flow_type & IRQ_TYPE_EDGE_BOTH) {
		irq_set_handler_locked(data, handle_fasteoi_ack_irq);
		bit_cfg |= GPIO_BIT_CFG_INT_TYPE;
	} else {
		irq_set_handler_locked(data, handle_fasteoi_mask_irq);
	}

	raw_spin_lock(&txgpio->lock);
	if (flow_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)) {
		bit_cfg |= GPIO_BIT_CFG_PIN_XOR;
		set_bit(txline->line, txgpio->invert_mask);
	} else {
		clear_bit(txline->line, txgpio->invert_mask);
	}
	clear_bit(txline->line, txgpio->od_mask);
	writeq(bit_cfg, txgpio->register_base + bit_cfg_reg(txline->line));
	raw_spin_unlock(&txgpio->lock);

	return IRQ_SET_MASK_OK;
}

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static void thunderx_gpio_irq_enable(struct irq_data *data)
{
	irq_chip_enable_parent(data);
	thunderx_gpio_irq_unmask(data);
}

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static void thunderx_gpio_irq_disable(struct irq_data *data)
{
	thunderx_gpio_irq_mask(data);
	irq_chip_disable_parent(data);
}

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static int thunderx_gpio_irq_request_resources(struct irq_data *data)
{
	struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
	struct thunderx_gpio *txgpio = txline->txgpio;
	struct irq_data *parent_data = data->parent_data;
	int r;

	r = gpiochip_lock_as_irq(&txgpio->chip, txline->line);
	if (r)
		return r;

	if (parent_data && parent_data->chip->irq_request_resources) {
		r = parent_data->chip->irq_request_resources(parent_data);
		if (r)
			goto error;
	}

	return 0;
error:
	gpiochip_unlock_as_irq(&txgpio->chip, txline->line);
	return r;
}

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static void thunderx_gpio_irq_release_resources(struct irq_data *data)
{
	struct thunderx_line *txline = irq_data_get_irq_chip_data(data);
	struct thunderx_gpio *txgpio = txline->txgpio;
	struct irq_data *parent_data = data->parent_data;

	if (parent_data && parent_data->chip->irq_release_resources)
		parent_data->chip->irq_release_resources(parent_data);

	gpiochip_unlock_as_irq(&txgpio->chip, txline->line);
}

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/*
 * Interrupts are chained from underlying MSI-X vectors.  We have
 * these irq_chip functions to be able to handle level triggering
 * semantics and other acknowledgment tasks associated with the GPIO
 * mechanism.
 */

static struct irq_chip thunderx_gpio_irq_chip = {
	.name			= "GPIO",
	.irq_enable		= thunderx_gpio_irq_enable,
	.irq_disable		= thunderx_gpio_irq_disable,
	.irq_ack		= thunderx_gpio_irq_ack,
	.irq_mask		= thunderx_gpio_irq_mask,
	.irq_mask_ack		= thunderx_gpio_irq_mask_ack,
	.irq_unmask		= thunderx_gpio_irq_unmask,
	.irq_eoi		= irq_chip_eoi_parent,
	.irq_set_affinity	= irq_chip_set_affinity_parent,
	.irq_request_resources	= thunderx_gpio_irq_request_resources,
	.irq_release_resources	= thunderx_gpio_irq_release_resources,
	.irq_set_type		= thunderx_gpio_irq_set_type,

	.flags			= IRQCHIP_SET_TYPE_MASKED
};



static int thunderx_gpio_irq_map(struct irq_domain *d, unsigned int irq,
				 irq_hw_number_t hwirq)
{
	struct thunderx_gpio *txgpio = d->host_data;

	if (hwirq >= txgpio->chip.ngpio)
		return -EINVAL;
	if (!thunderx_gpio_is_gpio_nowarn(txgpio, hwirq))
		return -EPERM;
	return 0;
}

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static int thunderx_gpio_irq_translate(struct irq_domain *d,
				       struct irq_fwspec *fwspec,
				       irq_hw_number_t *hwirq,
				       unsigned int *type)
{
	struct thunderx_gpio *txgpio = d->host_data;

	if (WARN_ON(fwspec->param_count < 2))
		return -EINVAL;
	if (fwspec->param[0] >= txgpio->chip.ngpio)
		return -EINVAL;
	*hwirq = fwspec->param[0];
	*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
	return 0;
}

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static int thunderx_gpio_irq_alloc(struct irq_domain *d, unsigned int virq,
				   unsigned int nr_irqs, void *arg)
{
	struct thunderx_line *txline = arg;

	return irq_domain_set_hwirq_and_chip(d, virq, txline->line,
					     &thunderx_gpio_irq_chip, txline);
}

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static const struct irq_domain_ops thunderx_gpio_irqd_ops = {
	.map		= thunderx_gpio_irq_map,
	.alloc		= thunderx_gpio_irq_alloc,
	.translate	= thunderx_gpio_irq_translate
};



static int thunderx_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
{
	struct thunderx_gpio *txgpio = gpiochip_get_data(chip);

	return irq_find_mapping(txgpio->irqd, offset);
}

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static int thunderx_gpio_probe(struct pci_dev *pdev,
			       const struct pci_device_id *id)
{
	void __iomem * const *tbl;
	struct device *dev = &pdev->dev;
	struct thunderx_gpio *txgpio;
	struct gpio_chip *chip;
	int ngpio, i;
	int err = 0;

	txgpio = devm_kzalloc(dev, sizeof(*txgpio), GFP_KERNEL);
	if (!txgpio)
		return -ENOMEM;

	raw_spin_lock_init(&txgpio->lock);
	chip = &txgpio->chip;

	pci_set_drvdata(pdev, txgpio);

	err = pcim_enable_device(pdev);
	if (err) {
		dev_err(dev, "Failed to enable PCI device: err %d\n", err);
		goto out;
	}

	err = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
	if (err) {
		dev_err(dev, "Failed to iomap PCI device: err %d\n", err);
		goto out;
	}

	tbl = pcim_iomap_table(pdev);
	txgpio->register_base = tbl[0];
	if (!txgpio->register_base) {
		dev_err(dev, "Cannot map PCI resource\n");
		err = -ENOMEM;
		goto out;
	}

	if (pdev->subsystem_device == 0xa10a) {
		/* CN88XX has no GPIO_CONST register*/
		ngpio = 50;
		txgpio->base_msi = 48;
	} else {
		u64 c = readq(txgpio->register_base + GPIO_CONST);

		ngpio = c & GPIO_CONST_GPIOS_MASK;
		txgpio->base_msi = (c >> 8) & 0xff;
	}

	txgpio->msix_entries = devm_kzalloc(dev,
					  sizeof(struct msix_entry) * ngpio,
					  GFP_KERNEL);
	if (!txgpio->msix_entries) {
		err = -ENOMEM;
		goto out;
	}

	txgpio->line_entries = devm_kzalloc(dev,
					    sizeof(struct thunderx_line) * ngpio,
					    GFP_KERNEL);
	if (!txgpio->line_entries) {
		err = -ENOMEM;
		goto out;
	}

	for (i = 0; i < ngpio; i++) {
		u64 bit_cfg = readq(txgpio->register_base + bit_cfg_reg(i));

		txgpio->msix_entries[i].entry = txgpio->base_msi + (2 * i);
		txgpio->line_entries[i].line = i;
		txgpio->line_entries[i].txgpio = txgpio;
		/*
                 * If something has already programmed the pin, use
                 * the existing glitch filter settings, otherwise go
                 * to 400nS.
                 */
		txgpio->line_entries[i].fil_bits = bit_cfg ?
			(bit_cfg & GPIO_BIT_CFG_FIL_MASK) : GLITCH_FILTER_400NS;

		if ((bit_cfg & GPIO_BIT_CFG_TX_OE) && (bit_cfg & GPIO_BIT_CFG_TX_OD))
			set_bit(i, txgpio->od_mask);
		if (bit_cfg & GPIO_BIT_CFG_PIN_XOR)
			set_bit(i, txgpio->invert_mask);
	}


	/* Enable all MSI-X for interrupts on all possible lines. */
	err = pci_enable_msix_range(pdev, txgpio->msix_entries, ngpio, ngpio);
	if (err < 0)
		goto out;

	/*
         * Push GPIO specific irqdomain on hierarchy created as a side
         * effect of the pci_enable_msix()
         */
	txgpio->irqd = irq_domain_create_hierarchy(irq_get_irq_data(txgpio->msix_entries[0].vector)->domain,
						   0, 0, of_node_to_fwnode(dev->of_node),
						   &thunderx_gpio_irqd_ops, txgpio);
	if (!txgpio->irqd)
		goto out;

	/* Push on irq_data and the domain for each line. */
	for (i = 0; i < ngpio; i++) {
		err = irq_domain_push_irq(txgpio->irqd,
					  txgpio->msix_entries[i].vector,
					  &txgpio->line_entries[i]);
		if (err < 0)
			dev_err(dev, "irq_domain_push_irq: %d\n", err);
	}

	chip->label = KBUILD_MODNAME;
	chip->parent = dev;
	chip->owner = THIS_MODULE;
	chip->request = thunderx_gpio_request;
	chip->base = -1; /* System allocated */
	chip->can_sleep = false;
	chip->ngpio = ngpio;
	chip->get_direction = thunderx_gpio_get_direction;
	chip->direction_input = thunderx_gpio_dir_in;
	chip->get = thunderx_gpio_get;
	chip->direction_output = thunderx_gpio_dir_out;
	chip->set = thunderx_gpio_set;
	chip->set_multiple = thunderx_gpio_set_multiple;
	chip->set_config = thunderx_gpio_set_config;
	chip->to_irq = thunderx_gpio_to_irq;
	err = devm_gpiochip_add_data(dev, chip, txgpio);
	if (err)
		goto out;

	dev_info(dev, "ThunderX GPIO: %d lines with base %d.\n",
		 ngpio, chip->base);
	return 0;
out:
	pci_set_drvdata(pdev, NULL);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
David Daney 719 100.00% 1 100.00%
Total 719 100.00% 1 100.00%



static void thunderx_gpio_remove(struct pci_dev *pdev)
{
	int i;
	struct thunderx_gpio *txgpio = pci_get_drvdata(pdev);

	for (i = 0; i < txgpio->chip.ngpio; i++)
		irq_domain_pop_irq(txgpio->irqd,
				   txgpio->msix_entries[i].vector);

	irq_domain_remove(txgpio->irqd);

	pci_set_drvdata(pdev, NULL);
}

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David Daney 71 100.00% 1 100.00%
Total 71 100.00% 1 100.00%


static const struct pci_device_id thunderx_gpio_id_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xA00A) },
	{ 0, }	/* end of table */
};

MODULE_DEVICE_TABLE(pci, thunderx_gpio_id_table);


static struct pci_driver thunderx_gpio_driver = {
	.name = KBUILD_MODNAME,
	.id_table = thunderx_gpio_id_table,
	.probe = thunderx_gpio_probe,
	.remove = thunderx_gpio_remove,
};


module_pci_driver(thunderx_gpio_driver);

MODULE_DESCRIPTION("Cavium Inc. ThunderX/OCTEON-TX GPIO Driver");
MODULE_LICENSE("GPL");
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Person Tokens Prop Commits CommitProp
David Daney 3052 100.00% 1 100.00%
Total 3052 100.00% 1 100.00%
Directory: drivers/gpio

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
David Daney	18	100.00%	1	100.00%
Total	18	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.14 drivers/gpio/gpio-thunderx.c

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