brintos

brintos / linux-shallow public Read only

0
0
Text · 5.4 KiB · c2a2c76 Raw
246 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 *  GPIO interface for Intel Sodaville SoCs.4 *5 *  Copyright (c) 2010, 2011 Intel Corporation6 *7 *  Author: Hans J. Koch <hjk@linutronix.de>8 */9 10#include <linux/errno.h>11#include <linux/gpio/driver.h>12#include <linux/init.h>13#include <linux/interrupt.h>14#include <linux/io.h>15#include <linux/irq.h>16#include <linux/kernel.h>17#include <linux/of_irq.h>18#include <linux/pci.h>19#include <linux/platform_device.h>20 21#define DRV_NAME		"sdv_gpio"22#define SDV_NUM_PUB_GPIOS	1223#define PCI_DEVICE_ID_SDV_GPIO	0x2e6724#define GPIO_BAR		025 26#define GPOUTR		0x0027#define GPOER		0x0428#define GPINR		0x0829 30#define GPSTR		0x0c31#define GPIT1R0		0x1032#define GPIO_INT	0x1433#define GPIT1R1		0x1834 35#define GPMUXCTL	0x1c36 37struct sdv_gpio_chip_data {38	int irq_base;39	void __iomem *gpio_pub_base;40	struct irq_domain *id;41	struct irq_chip_generic *gc;42	struct gpio_chip chip;43};44 45static int sdv_gpio_pub_set_type(struct irq_data *d, unsigned int type)46{47	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);48	struct sdv_gpio_chip_data *sd = gc->private;49	void __iomem *type_reg;50	u32 reg;51 52	if (d->hwirq < 8)53		type_reg = sd->gpio_pub_base + GPIT1R0;54	else55		type_reg = sd->gpio_pub_base + GPIT1R1;56 57	reg = readl(type_reg);58 59	switch (type) {60	case IRQ_TYPE_LEVEL_HIGH:61		reg &= ~BIT(4 * (d->hwirq % 8));62		break;63 64	case IRQ_TYPE_LEVEL_LOW:65		reg |= BIT(4 * (d->hwirq % 8));66		break;67 68	default:69		return -EINVAL;70	}71 72	writel(reg, type_reg);73	return 0;74}75 76static irqreturn_t sdv_gpio_pub_irq_handler(int irq, void *data)77{78	struct sdv_gpio_chip_data *sd = data;79	unsigned long irq_stat = readl(sd->gpio_pub_base + GPSTR);80	int irq_bit;81 82	irq_stat &= readl(sd->gpio_pub_base + GPIO_INT);83	if (!irq_stat)84		return IRQ_NONE;85 86	for_each_set_bit(irq_bit, &irq_stat, 32)87		generic_handle_domain_irq(sd->id, irq_bit);88 89	return IRQ_HANDLED;90}91 92static int sdv_xlate(struct irq_domain *h, struct device_node *node,93		const u32 *intspec, u32 intsize, irq_hw_number_t *out_hwirq,94		u32 *out_type)95{96	u32 line, type;97 98	if (node != irq_domain_get_of_node(h))99		return -EINVAL;100 101	if (intsize < 2)102		return -EINVAL;103 104	line = *intspec;105	*out_hwirq = line;106 107	intspec++;108	type = *intspec;109 110	switch (type) {111	case IRQ_TYPE_LEVEL_LOW:112	case IRQ_TYPE_LEVEL_HIGH:113		*out_type = type;114		break;115	default:116		return -EINVAL;117	}118	return 0;119}120 121static const struct irq_domain_ops irq_domain_sdv_ops = {122	.xlate = sdv_xlate,123};124 125static int sdv_register_irqsupport(struct sdv_gpio_chip_data *sd,126		struct pci_dev *pdev)127{128	struct irq_chip_type *ct;129	int ret;130 131	sd->irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0,132					    SDV_NUM_PUB_GPIOS, -1);133	if (sd->irq_base < 0)134		return sd->irq_base;135 136	/* mask + ACK all interrupt sources */137	writel(0, sd->gpio_pub_base + GPIO_INT);138	writel((1 << 11) - 1, sd->gpio_pub_base + GPSTR);139 140	ret = devm_request_irq(&pdev->dev, pdev->irq,141			       sdv_gpio_pub_irq_handler, IRQF_SHARED,142			       "sdv_gpio", sd);143	if (ret)144		return ret;145 146	/*147	 * This gpio irq controller latches level irqs. Testing shows that if148	 * we unmask & ACK the IRQ before the source of the interrupt is gone149	 * then the interrupt is active again.150	 */151	sd->gc = devm_irq_alloc_generic_chip(&pdev->dev, "sdv-gpio", 1,152					     sd->irq_base,153					     sd->gpio_pub_base,154					     handle_fasteoi_irq);155	if (!sd->gc)156		return -ENOMEM;157 158	sd->gc->private = sd;159	ct = sd->gc->chip_types;160	ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;161	ct->regs.eoi = GPSTR;162	ct->regs.mask = GPIO_INT;163	ct->chip.irq_mask = irq_gc_mask_clr_bit;164	ct->chip.irq_unmask = irq_gc_mask_set_bit;165	ct->chip.irq_eoi = irq_gc_eoi;166	ct->chip.irq_set_type = sdv_gpio_pub_set_type;167 168	irq_setup_generic_chip(sd->gc, IRQ_MSK(SDV_NUM_PUB_GPIOS),169			IRQ_GC_INIT_MASK_CACHE, IRQ_NOREQUEST,170			IRQ_LEVEL | IRQ_NOPROBE);171 172	sd->id = irq_domain_add_legacy(pdev->dev.of_node, SDV_NUM_PUB_GPIOS,173				sd->irq_base, 0, &irq_domain_sdv_ops, sd);174	if (!sd->id)175		return -ENODEV;176 177	return 0;178}179 180static int sdv_gpio_probe(struct pci_dev *pdev,181					const struct pci_device_id *pci_id)182{183	struct sdv_gpio_chip_data *sd;184	int ret;185	u32 mux_val;186 187	sd = devm_kzalloc(&pdev->dev, sizeof(*sd), GFP_KERNEL);188	if (!sd)189		return -ENOMEM;190 191	ret = pcim_enable_device(pdev);192	if (ret) {193		dev_err(&pdev->dev, "can't enable device.\n");194		return ret;195	}196 197	ret = pcim_iomap_regions(pdev, 1 << GPIO_BAR, DRV_NAME);198	if (ret) {199		dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", GPIO_BAR);200		return ret;201	}202 203	sd->gpio_pub_base = pcim_iomap_table(pdev)[GPIO_BAR];204 205	ret = of_property_read_u32(pdev->dev.of_node, "intel,muxctl", &mux_val);206	if (!ret)207		writel(mux_val, sd->gpio_pub_base + GPMUXCTL);208 209	ret = bgpio_init(&sd->chip, &pdev->dev, 4,210			sd->gpio_pub_base + GPINR, sd->gpio_pub_base + GPOUTR,211			NULL, sd->gpio_pub_base + GPOER, NULL, 0);212	if (ret)213		return ret;214 215	sd->chip.ngpio = SDV_NUM_PUB_GPIOS;216 217	ret = devm_gpiochip_add_data(&pdev->dev, &sd->chip, sd);218	if (ret < 0) {219		dev_err(&pdev->dev, "gpiochip_add() failed.\n");220		return ret;221	}222 223	ret = sdv_register_irqsupport(sd, pdev);224	if (ret)225		return ret;226 227	pci_set_drvdata(pdev, sd);228	dev_info(&pdev->dev, "Sodaville GPIO driver registered.\n");229	return 0;230}231 232static const struct pci_device_id sdv_gpio_pci_ids[] = {233	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_SDV_GPIO) },234	{ 0, },235};236 237static struct pci_driver sdv_gpio_driver = {238	.driver = {239		.suppress_bind_attrs = true,240	},241	.name = DRV_NAME,242	.id_table = sdv_gpio_pci_ids,243	.probe = sdv_gpio_probe,244};245builtin_pci_driver(sdv_gpio_driver);246