1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2016-2022 NVIDIA Corporation
5 * Author: Thierry Reding <treding@nvidia.com>
6 * Dipen Patel <dpatel@nvidia.com>
9 #include <linux/gpio/driver.h>
10 #include <linux/hte.h>
11 #include <linux/interrupt.h>
12 #include <linux/irq.h>
13 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/seq_file.h>
18 #include <dt-bindings/gpio/tegra186-gpio.h>
19 #include <dt-bindings/gpio/tegra194-gpio.h>
20 #include <dt-bindings/gpio/tegra234-gpio.h>
21 #include <dt-bindings/gpio/tegra241-gpio.h>
23 /* security registers */
24 #define TEGRA186_GPIO_CTL_SCR 0x0c
25 #define TEGRA186_GPIO_CTL_SCR_SEC_WEN BIT(28)
26 #define TEGRA186_GPIO_CTL_SCR_SEC_REN BIT(27)
28 #define TEGRA186_GPIO_INT_ROUTE_MAPPING(p, x) (0x14 + (p) * 0x20 + (x) * 4)
30 #define TEGRA186_GPIO_VM 0x00
31 #define TEGRA186_GPIO_VM_RW_MASK 0x03
32 #define TEGRA186_GPIO_SCR 0x04
33 #define TEGRA186_GPIO_SCR_PIN_SIZE 0x08
34 #define TEGRA186_GPIO_SCR_PORT_SIZE 0x40
35 #define TEGRA186_GPIO_SCR_SEC_WEN BIT(28)
36 #define TEGRA186_GPIO_SCR_SEC_REN BIT(27)
37 #define TEGRA186_GPIO_SCR_SEC_G1W BIT(9)
38 #define TEGRA186_GPIO_SCR_SEC_G1R BIT(1)
40 /* control registers */
41 #define TEGRA186_GPIO_ENABLE_CONFIG 0x00
42 #define TEGRA186_GPIO_ENABLE_CONFIG_ENABLE BIT(0)
43 #define TEGRA186_GPIO_ENABLE_CONFIG_OUT BIT(1)
44 #define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_NONE (0x0 << 2)
45 #define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_LEVEL (0x1 << 2)
46 #define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE (0x2 << 2)
47 #define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE (0x3 << 2)
48 #define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_MASK (0x3 << 2)
49 #define TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL BIT(4)
50 #define TEGRA186_GPIO_ENABLE_CONFIG_DEBOUNCE BIT(5)
51 #define TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT BIT(6)
52 #define TEGRA186_GPIO_ENABLE_CONFIG_TIMESTAMP_FUNC BIT(7)
54 #define TEGRA186_GPIO_DEBOUNCE_CONTROL 0x04
55 #define TEGRA186_GPIO_DEBOUNCE_CONTROL_THRESHOLD(x) ((x) & 0xff)
57 #define TEGRA186_GPIO_INPUT 0x08
58 #define TEGRA186_GPIO_INPUT_HIGH BIT(0)
60 #define TEGRA186_GPIO_OUTPUT_CONTROL 0x0c
61 #define TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED BIT(0)
63 #define TEGRA186_GPIO_OUTPUT_VALUE 0x10
64 #define TEGRA186_GPIO_OUTPUT_VALUE_HIGH BIT(0)
66 #define TEGRA186_GPIO_INTERRUPT_CLEAR 0x14
68 #define TEGRA186_GPIO_INTERRUPT_STATUS(x) (0x100 + (x) * 4)
70 struct tegra_gpio_port {
77 struct tegra186_pin_range {
82 struct tegra_gpio_soc {
83 const struct tegra_gpio_port *ports;
84 unsigned int num_ports;
86 unsigned int instance;
88 unsigned int num_irqs_per_bank;
90 const struct tegra186_pin_range *pin_ranges;
91 unsigned int num_pin_ranges;
98 struct gpio_chip gpio;
102 const struct tegra_gpio_soc *soc;
103 unsigned int num_irqs_per_bank;
104 unsigned int num_banks;
106 void __iomem *secure;
110 static const struct tegra_gpio_port *
111 tegra186_gpio_get_port(struct tegra_gpio *gpio, unsigned int *pin)
113 unsigned int start = 0, i;
115 for (i = 0; i < gpio->soc->num_ports; i++) {
116 const struct tegra_gpio_port *port = &gpio->soc->ports[i];
118 if (*pin >= start && *pin < start + port->pins) {
129 static void __iomem *tegra186_gpio_get_base(struct tegra_gpio *gpio,
132 const struct tegra_gpio_port *port;
135 port = tegra186_gpio_get_port(gpio, &pin);
139 offset = port->bank * 0x1000 + port->port * 0x200;
141 return gpio->base + offset + pin * 0x20;
144 static void __iomem *tegra186_gpio_get_secure_base(struct tegra_gpio *gpio,
147 const struct tegra_gpio_port *port;
150 port = tegra186_gpio_get_port(gpio, &pin);
154 offset = port->bank * 0x1000 + port->port * TEGRA186_GPIO_SCR_PORT_SIZE;
156 return gpio->secure + offset + pin * TEGRA186_GPIO_SCR_PIN_SIZE;
159 static inline bool tegra186_gpio_is_accessible(struct tegra_gpio *gpio, unsigned int pin)
161 void __iomem *secure;
164 secure = tegra186_gpio_get_secure_base(gpio, pin);
166 if (gpio->soc->has_vm_support) {
167 value = readl(secure + TEGRA186_GPIO_VM);
168 if ((value & TEGRA186_GPIO_VM_RW_MASK) != TEGRA186_GPIO_VM_RW_MASK)
172 value = __raw_readl(secure + TEGRA186_GPIO_SCR);
175 * When SCR_SEC_[R|W]EN is unset, then we have full read/write access to all the
176 * registers for given GPIO pin.
177 * When SCR_SEC[R|W]EN is set, then there is need to further check the accompanying
178 * SCR_SEC_G1[R|W] bit to determine read/write access to all the registers for given
182 if (((value & TEGRA186_GPIO_SCR_SEC_REN) == 0 ||
183 ((value & TEGRA186_GPIO_SCR_SEC_REN) && (value & TEGRA186_GPIO_SCR_SEC_G1R))) &&
184 ((value & TEGRA186_GPIO_SCR_SEC_WEN) == 0 ||
185 ((value & TEGRA186_GPIO_SCR_SEC_WEN) && (value & TEGRA186_GPIO_SCR_SEC_G1W))))
191 static int tegra186_init_valid_mask(struct gpio_chip *chip,
192 unsigned long *valid_mask, unsigned int ngpios)
194 struct tegra_gpio *gpio = gpiochip_get_data(chip);
197 for (j = 0; j < ngpios; j++) {
198 if (!tegra186_gpio_is_accessible(gpio, j))
199 clear_bit(j, valid_mask);
204 static int tegra186_gpio_get_direction(struct gpio_chip *chip,
207 struct tegra_gpio *gpio = gpiochip_get_data(chip);
211 base = tegra186_gpio_get_base(gpio, offset);
212 if (WARN_ON(base == NULL))
215 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
216 if (value & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
217 return GPIO_LINE_DIRECTION_OUT;
219 return GPIO_LINE_DIRECTION_IN;
222 static int tegra186_gpio_direction_input(struct gpio_chip *chip,
225 struct tegra_gpio *gpio = gpiochip_get_data(chip);
229 base = tegra186_gpio_get_base(gpio, offset);
230 if (WARN_ON(base == NULL))
233 value = readl(base + TEGRA186_GPIO_OUTPUT_CONTROL);
234 value |= TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
235 writel(value, base + TEGRA186_GPIO_OUTPUT_CONTROL);
237 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
238 value |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
239 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_OUT;
240 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
245 static int tegra186_gpio_direction_output(struct gpio_chip *chip,
246 unsigned int offset, int level)
248 struct tegra_gpio *gpio = gpiochip_get_data(chip);
252 /* configure output level first */
253 chip->set(chip, offset, level);
255 base = tegra186_gpio_get_base(gpio, offset);
256 if (WARN_ON(base == NULL))
259 /* set the direction */
260 value = readl(base + TEGRA186_GPIO_OUTPUT_CONTROL);
261 value &= ~TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
262 writel(value, base + TEGRA186_GPIO_OUTPUT_CONTROL);
264 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
265 value |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
266 value |= TEGRA186_GPIO_ENABLE_CONFIG_OUT;
267 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
272 #define HTE_BOTH_EDGES (HTE_RISING_EDGE_TS | HTE_FALLING_EDGE_TS)
274 static int tegra186_gpio_en_hw_ts(struct gpio_chip *gc, u32 offset,
277 struct tegra_gpio *gpio;
284 gpio = gpiochip_get_data(gc);
288 base = tegra186_gpio_get_base(gpio, offset);
289 if (WARN_ON(base == NULL))
292 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
293 value |= TEGRA186_GPIO_ENABLE_CONFIG_TIMESTAMP_FUNC;
295 if (flags == HTE_BOTH_EDGES) {
296 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE;
297 } else if (flags == HTE_RISING_EDGE_TS) {
298 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
299 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
300 } else if (flags == HTE_FALLING_EDGE_TS) {
301 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
304 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
309 static int tegra186_gpio_dis_hw_ts(struct gpio_chip *gc, u32 offset,
312 struct tegra_gpio *gpio;
319 gpio = gpiochip_get_data(gc);
323 base = tegra186_gpio_get_base(gpio, offset);
324 if (WARN_ON(base == NULL))
327 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
328 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TIMESTAMP_FUNC;
329 if (flags == HTE_BOTH_EDGES) {
330 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE;
331 } else if (flags == HTE_RISING_EDGE_TS) {
332 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
333 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
334 } else if (flags == HTE_FALLING_EDGE_TS) {
335 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
337 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
342 static int tegra186_gpio_get(struct gpio_chip *chip, unsigned int offset)
344 struct tegra_gpio *gpio = gpiochip_get_data(chip);
348 base = tegra186_gpio_get_base(gpio, offset);
349 if (WARN_ON(base == NULL))
352 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
353 if (value & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
354 value = readl(base + TEGRA186_GPIO_OUTPUT_VALUE);
356 value = readl(base + TEGRA186_GPIO_INPUT);
358 return value & BIT(0);
361 static void tegra186_gpio_set(struct gpio_chip *chip, unsigned int offset,
364 struct tegra_gpio *gpio = gpiochip_get_data(chip);
368 base = tegra186_gpio_get_base(gpio, offset);
369 if (WARN_ON(base == NULL))
372 value = readl(base + TEGRA186_GPIO_OUTPUT_VALUE);
374 value &= ~TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
376 value |= TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
378 writel(value, base + TEGRA186_GPIO_OUTPUT_VALUE);
381 static int tegra186_gpio_set_config(struct gpio_chip *chip,
383 unsigned long config)
385 struct tegra_gpio *gpio = gpiochip_get_data(chip);
389 base = tegra186_gpio_get_base(gpio, offset);
393 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
396 debounce = pinconf_to_config_argument(config);
399 * The Tegra186 GPIO controller supports a maximum of 255 ms debounce
402 if (debounce > 255000)
405 debounce = DIV_ROUND_UP(debounce, USEC_PER_MSEC);
407 value = TEGRA186_GPIO_DEBOUNCE_CONTROL_THRESHOLD(debounce);
408 writel(value, base + TEGRA186_GPIO_DEBOUNCE_CONTROL);
410 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
411 value |= TEGRA186_GPIO_ENABLE_CONFIG_DEBOUNCE;
412 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
417 static int tegra186_gpio_add_pin_ranges(struct gpio_chip *chip)
419 struct tegra_gpio *gpio = gpiochip_get_data(chip);
420 struct pinctrl_dev *pctldev;
421 struct device_node *np;
425 if (!gpio->soc->pinmux || gpio->soc->num_pin_ranges == 0)
428 np = of_find_compatible_node(NULL, NULL, gpio->soc->pinmux);
432 pctldev = of_pinctrl_get(np);
435 return -EPROBE_DEFER;
437 for (i = 0; i < gpio->soc->num_pin_ranges; i++) {
438 unsigned int pin = gpio->soc->pin_ranges[i].offset, port;
439 const char *group = gpio->soc->pin_ranges[i].group;
444 if (port >= gpio->soc->num_ports) {
445 dev_warn(chip->parent, "invalid port %u for %s\n",
450 for (j = 0; j < port; j++)
451 pin += gpio->soc->ports[j].pins;
453 err = gpiochip_add_pingroup_range(chip, pctldev, pin, group);
461 static int tegra186_gpio_of_xlate(struct gpio_chip *chip,
462 const struct of_phandle_args *spec,
465 struct tegra_gpio *gpio = gpiochip_get_data(chip);
466 unsigned int port, pin, i, offset = 0;
468 if (WARN_ON(chip->of_gpio_n_cells < 2))
471 if (WARN_ON(spec->args_count < chip->of_gpio_n_cells))
474 port = spec->args[0] / 8;
475 pin = spec->args[0] % 8;
477 if (port >= gpio->soc->num_ports) {
478 dev_err(chip->parent, "invalid port number: %u\n", port);
482 for (i = 0; i < port; i++)
483 offset += gpio->soc->ports[i].pins;
486 *flags = spec->args[1];
491 #define to_tegra_gpio(x) container_of((x), struct tegra_gpio, gpio)
493 static void tegra186_irq_ack(struct irq_data *data)
495 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
496 struct tegra_gpio *gpio = to_tegra_gpio(gc);
499 base = tegra186_gpio_get_base(gpio, data->hwirq);
500 if (WARN_ON(base == NULL))
503 writel(1, base + TEGRA186_GPIO_INTERRUPT_CLEAR);
506 static void tegra186_irq_mask(struct irq_data *data)
508 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
509 struct tegra_gpio *gpio = to_tegra_gpio(gc);
513 base = tegra186_gpio_get_base(gpio, data->hwirq);
514 if (WARN_ON(base == NULL))
517 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
518 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT;
519 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
521 gpiochip_disable_irq(&gpio->gpio, data->hwirq);
524 static void tegra186_irq_unmask(struct irq_data *data)
526 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
527 struct tegra_gpio *gpio = to_tegra_gpio(gc);
531 base = tegra186_gpio_get_base(gpio, data->hwirq);
532 if (WARN_ON(base == NULL))
535 gpiochip_enable_irq(&gpio->gpio, data->hwirq);
537 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
538 value |= TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT;
539 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
542 static int tegra186_irq_set_type(struct irq_data *data, unsigned int type)
544 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
545 struct tegra_gpio *gpio = to_tegra_gpio(gc);
549 base = tegra186_gpio_get_base(gpio, data->hwirq);
550 if (WARN_ON(base == NULL))
553 value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
554 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_MASK;
555 value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
557 switch (type & IRQ_TYPE_SENSE_MASK) {
561 case IRQ_TYPE_EDGE_RISING:
562 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
563 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
566 case IRQ_TYPE_EDGE_FALLING:
567 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
570 case IRQ_TYPE_EDGE_BOTH:
571 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE;
574 case IRQ_TYPE_LEVEL_HIGH:
575 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_LEVEL;
576 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
579 case IRQ_TYPE_LEVEL_LOW:
580 value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_LEVEL;
587 writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
589 if ((type & IRQ_TYPE_EDGE_BOTH) == 0)
590 irq_set_handler_locked(data, handle_level_irq);
592 irq_set_handler_locked(data, handle_edge_irq);
594 if (data->parent_data)
595 return irq_chip_set_type_parent(data, type);
600 static int tegra186_irq_set_wake(struct irq_data *data, unsigned int on)
602 if (data->parent_data)
603 return irq_chip_set_wake_parent(data, on);
608 static void tegra186_irq_print_chip(struct irq_data *data, struct seq_file *p)
610 struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
612 seq_printf(p, dev_name(gc->parent));
615 static const struct irq_chip tegra186_gpio_irq_chip = {
616 .irq_ack = tegra186_irq_ack,
617 .irq_mask = tegra186_irq_mask,
618 .irq_unmask = tegra186_irq_unmask,
619 .irq_set_type = tegra186_irq_set_type,
620 .irq_set_wake = tegra186_irq_set_wake,
621 .irq_print_chip = tegra186_irq_print_chip,
622 .flags = IRQCHIP_IMMUTABLE,
623 GPIOCHIP_IRQ_RESOURCE_HELPERS,
626 static void tegra186_gpio_irq(struct irq_desc *desc)
628 struct tegra_gpio *gpio = irq_desc_get_handler_data(desc);
629 struct irq_domain *domain = gpio->gpio.irq.domain;
630 struct irq_chip *chip = irq_desc_get_chip(desc);
631 unsigned int parent = irq_desc_get_irq(desc);
632 unsigned int i, j, offset = 0;
634 chained_irq_enter(chip, desc);
636 for (i = 0; i < gpio->soc->num_ports; i++) {
637 const struct tegra_gpio_port *port = &gpio->soc->ports[i];
642 base = gpio->base + port->bank * 0x1000 + port->port * 0x200;
644 /* skip ports that are not associated with this bank */
645 for (j = 0; j < gpio->num_irqs_per_bank; j++) {
646 if (parent == gpio->irq[port->bank * gpio->num_irqs_per_bank + j])
650 if (j == gpio->num_irqs_per_bank)
653 value = readl(base + TEGRA186_GPIO_INTERRUPT_STATUS(1));
655 for_each_set_bit(pin, &value, port->pins) {
656 int ret = generic_handle_domain_irq(domain, offset + pin);
657 WARN_RATELIMIT(ret, "hwirq = %d", offset + pin);
661 offset += port->pins;
664 chained_irq_exit(chip, desc);
667 static int tegra186_gpio_irq_domain_translate(struct irq_domain *domain,
668 struct irq_fwspec *fwspec,
669 unsigned long *hwirq,
672 struct tegra_gpio *gpio = gpiochip_get_data(domain->host_data);
673 unsigned int port, pin, i, offset = 0;
675 if (WARN_ON(gpio->gpio.of_gpio_n_cells < 2))
678 if (WARN_ON(fwspec->param_count < gpio->gpio.of_gpio_n_cells))
681 port = fwspec->param[0] / 8;
682 pin = fwspec->param[0] % 8;
684 if (port >= gpio->soc->num_ports)
687 for (i = 0; i < port; i++)
688 offset += gpio->soc->ports[i].pins;
690 *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
691 *hwirq = offset + pin;
696 static int tegra186_gpio_populate_parent_fwspec(struct gpio_chip *chip,
697 union gpio_irq_fwspec *gfwspec,
698 unsigned int parent_hwirq,
699 unsigned int parent_type)
701 struct tegra_gpio *gpio = gpiochip_get_data(chip);
702 struct irq_fwspec *fwspec = &gfwspec->fwspec;
704 fwspec->fwnode = chip->irq.parent_domain->fwnode;
705 fwspec->param_count = 3;
706 fwspec->param[0] = gpio->soc->instance;
707 fwspec->param[1] = parent_hwirq;
708 fwspec->param[2] = parent_type;
713 static int tegra186_gpio_child_to_parent_hwirq(struct gpio_chip *chip,
716 unsigned int *parent_hwirq,
717 unsigned int *parent_type)
719 *parent_hwirq = chip->irq.child_offset_to_irq(chip, hwirq);
725 static unsigned int tegra186_gpio_child_offset_to_irq(struct gpio_chip *chip,
728 struct tegra_gpio *gpio = gpiochip_get_data(chip);
731 for (i = 0; i < gpio->soc->num_ports; i++) {
732 if (offset < gpio->soc->ports[i].pins)
735 offset -= gpio->soc->ports[i].pins;
738 return offset + i * 8;
741 static const struct of_device_id tegra186_pmc_of_match[] = {
742 { .compatible = "nvidia,tegra186-pmc" },
743 { .compatible = "nvidia,tegra194-pmc" },
744 { .compatible = "nvidia,tegra234-pmc" },
748 static void tegra186_gpio_init_route_mapping(struct tegra_gpio *gpio)
750 struct device *dev = gpio->gpio.parent;
754 for (i = 0; i < gpio->soc->num_ports; i++) {
755 const struct tegra_gpio_port *port = &gpio->soc->ports[i];
756 unsigned int offset, p = port->port;
759 base = gpio->secure + port->bank * 0x1000 + 0x800;
761 value = readl(base + TEGRA186_GPIO_CTL_SCR);
764 * For controllers that haven't been locked down yet, make
765 * sure to program the default interrupt route mapping.
767 if ((value & TEGRA186_GPIO_CTL_SCR_SEC_REN) == 0 &&
768 (value & TEGRA186_GPIO_CTL_SCR_SEC_WEN) == 0) {
770 * On Tegra194 and later, each pin can be routed to one or more
773 dev_dbg(dev, "programming default interrupt routing for port %s\n",
776 offset = TEGRA186_GPIO_INT_ROUTE_MAPPING(p, 0);
779 * By default we only want to route GPIO pins to IRQ 0. This works
780 * only under the assumption that we're running as the host kernel
781 * and hence all GPIO pins are owned by Linux.
783 * For cases where Linux is the guest OS, the hypervisor will have
784 * to configure the interrupt routing and pass only the valid
785 * interrupts via device tree.
787 value = readl(base + offset);
788 value = BIT(port->pins) - 1;
789 writel(value, base + offset);
794 static unsigned int tegra186_gpio_irqs_per_bank(struct tegra_gpio *gpio)
796 struct device *dev = gpio->gpio.parent;
798 if (gpio->num_irq > gpio->num_banks) {
799 if (gpio->num_irq % gpio->num_banks != 0)
803 if (gpio->num_irq < gpio->num_banks)
806 gpio->num_irqs_per_bank = gpio->num_irq / gpio->num_banks;
808 if (gpio->num_irqs_per_bank > gpio->soc->num_irqs_per_bank)
814 dev_err(dev, "invalid number of interrupts (%u) for %u banks\n",
815 gpio->num_irq, gpio->num_banks);
819 static int tegra186_gpio_probe(struct platform_device *pdev)
821 unsigned int i, j, offset;
822 struct gpio_irq_chip *irq;
823 struct tegra_gpio *gpio;
824 struct device_node *np;
828 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
832 gpio->soc = device_get_match_data(&pdev->dev);
833 gpio->gpio.label = gpio->soc->name;
834 gpio->gpio.parent = &pdev->dev;
836 /* count the number of banks in the controller */
837 for (i = 0; i < gpio->soc->num_ports; i++)
838 if (gpio->soc->ports[i].bank > gpio->num_banks)
839 gpio->num_banks = gpio->soc->ports[i].bank;
843 /* get register apertures */
844 gpio->secure = devm_platform_ioremap_resource_byname(pdev, "security");
845 if (IS_ERR(gpio->secure)) {
846 gpio->secure = devm_platform_ioremap_resource(pdev, 0);
847 if (IS_ERR(gpio->secure))
848 return PTR_ERR(gpio->secure);
851 gpio->base = devm_platform_ioremap_resource_byname(pdev, "gpio");
852 if (IS_ERR(gpio->base)) {
853 gpio->base = devm_platform_ioremap_resource(pdev, 1);
854 if (IS_ERR(gpio->base))
855 return PTR_ERR(gpio->base);
858 err = platform_irq_count(pdev);
864 err = tegra186_gpio_irqs_per_bank(gpio);
868 gpio->irq = devm_kcalloc(&pdev->dev, gpio->num_irq, sizeof(*gpio->irq),
873 for (i = 0; i < gpio->num_irq; i++) {
874 err = platform_get_irq(pdev, i);
881 gpio->gpio.request = gpiochip_generic_request;
882 gpio->gpio.free = gpiochip_generic_free;
883 gpio->gpio.get_direction = tegra186_gpio_get_direction;
884 gpio->gpio.direction_input = tegra186_gpio_direction_input;
885 gpio->gpio.direction_output = tegra186_gpio_direction_output;
886 gpio->gpio.get = tegra186_gpio_get;
887 gpio->gpio.set = tegra186_gpio_set;
888 gpio->gpio.set_config = tegra186_gpio_set_config;
889 gpio->gpio.add_pin_ranges = tegra186_gpio_add_pin_ranges;
890 gpio->gpio.init_valid_mask = tegra186_init_valid_mask;
891 if (gpio->soc->has_gte) {
892 gpio->gpio.en_hw_timestamp = tegra186_gpio_en_hw_ts;
893 gpio->gpio.dis_hw_timestamp = tegra186_gpio_dis_hw_ts;
896 gpio->gpio.base = -1;
898 for (i = 0; i < gpio->soc->num_ports; i++)
899 gpio->gpio.ngpio += gpio->soc->ports[i].pins;
901 names = devm_kcalloc(gpio->gpio.parent, gpio->gpio.ngpio,
902 sizeof(*names), GFP_KERNEL);
906 for (i = 0, offset = 0; i < gpio->soc->num_ports; i++) {
907 const struct tegra_gpio_port *port = &gpio->soc->ports[i];
910 for (j = 0; j < port->pins; j++) {
911 name = devm_kasprintf(gpio->gpio.parent, GFP_KERNEL,
912 "P%s.%02x", port->name, j);
916 names[offset + j] = name;
919 offset += port->pins;
922 gpio->gpio.names = (const char * const *)names;
924 #if defined(CONFIG_OF_GPIO)
925 gpio->gpio.of_gpio_n_cells = 2;
926 gpio->gpio.of_xlate = tegra186_gpio_of_xlate;
927 #endif /* CONFIG_OF_GPIO */
929 irq = &gpio->gpio.irq;
930 gpio_irq_chip_set_chip(irq, &tegra186_gpio_irq_chip);
931 irq->fwnode = of_node_to_fwnode(pdev->dev.of_node);
932 irq->child_to_parent_hwirq = tegra186_gpio_child_to_parent_hwirq;
933 irq->populate_parent_alloc_arg = tegra186_gpio_populate_parent_fwspec;
934 irq->child_offset_to_irq = tegra186_gpio_child_offset_to_irq;
935 irq->child_irq_domain_ops.translate = tegra186_gpio_irq_domain_translate;
936 irq->handler = handle_simple_irq;
937 irq->default_type = IRQ_TYPE_NONE;
938 irq->parent_handler = tegra186_gpio_irq;
939 irq->parent_handler_data = gpio;
940 irq->num_parents = gpio->num_irq;
943 * To simplify things, use a single interrupt per bank for now. Some
944 * chips support up to 8 interrupts per bank, which can be useful to
945 * distribute the load and decrease the processing latency for GPIOs
946 * but it also requires a more complicated interrupt routing than we
949 if (gpio->num_irqs_per_bank > 1) {
950 irq->parents = devm_kcalloc(&pdev->dev, gpio->num_banks,
951 sizeof(*irq->parents), GFP_KERNEL);
955 for (i = 0; i < gpio->num_banks; i++)
956 irq->parents[i] = gpio->irq[i * gpio->num_irqs_per_bank];
958 irq->num_parents = gpio->num_banks;
960 irq->num_parents = gpio->num_irq;
961 irq->parents = gpio->irq;
964 if (gpio->soc->num_irqs_per_bank > 1)
965 tegra186_gpio_init_route_mapping(gpio);
967 np = of_find_matching_node(NULL, tegra186_pmc_of_match);
969 if (of_device_is_available(np)) {
970 irq->parent_domain = irq_find_host(np);
973 if (!irq->parent_domain)
974 return -EPROBE_DEFER;
980 irq->map = devm_kcalloc(&pdev->dev, gpio->gpio.ngpio,
981 sizeof(*irq->map), GFP_KERNEL);
985 for (i = 0, offset = 0; i < gpio->soc->num_ports; i++) {
986 const struct tegra_gpio_port *port = &gpio->soc->ports[i];
988 for (j = 0; j < port->pins; j++)
989 irq->map[offset + j] = irq->parents[port->bank];
991 offset += port->pins;
994 return devm_gpiochip_add_data(&pdev->dev, &gpio->gpio, gpio);
997 #define TEGRA186_MAIN_GPIO_PORT(_name, _bank, _port, _pins) \
998 [TEGRA186_MAIN_GPIO_PORT_##_name] = { \
1005 static const struct tegra_gpio_port tegra186_main_ports[] = {
1006 TEGRA186_MAIN_GPIO_PORT( A, 2, 0, 7),
1007 TEGRA186_MAIN_GPIO_PORT( B, 3, 0, 7),
1008 TEGRA186_MAIN_GPIO_PORT( C, 3, 1, 7),
1009 TEGRA186_MAIN_GPIO_PORT( D, 3, 2, 6),
1010 TEGRA186_MAIN_GPIO_PORT( E, 2, 1, 8),
1011 TEGRA186_MAIN_GPIO_PORT( F, 2, 2, 6),
1012 TEGRA186_MAIN_GPIO_PORT( G, 4, 1, 6),
1013 TEGRA186_MAIN_GPIO_PORT( H, 1, 0, 7),
1014 TEGRA186_MAIN_GPIO_PORT( I, 0, 4, 8),
1015 TEGRA186_MAIN_GPIO_PORT( J, 5, 0, 8),
1016 TEGRA186_MAIN_GPIO_PORT( K, 5, 1, 1),
1017 TEGRA186_MAIN_GPIO_PORT( L, 1, 1, 8),
1018 TEGRA186_MAIN_GPIO_PORT( M, 5, 3, 6),
1019 TEGRA186_MAIN_GPIO_PORT( N, 0, 0, 7),
1020 TEGRA186_MAIN_GPIO_PORT( O, 0, 1, 4),
1021 TEGRA186_MAIN_GPIO_PORT( P, 4, 0, 7),
1022 TEGRA186_MAIN_GPIO_PORT( Q, 0, 2, 6),
1023 TEGRA186_MAIN_GPIO_PORT( R, 0, 5, 6),
1024 TEGRA186_MAIN_GPIO_PORT( T, 0, 3, 4),
1025 TEGRA186_MAIN_GPIO_PORT( X, 1, 2, 8),
1026 TEGRA186_MAIN_GPIO_PORT( Y, 1, 3, 7),
1027 TEGRA186_MAIN_GPIO_PORT(BB, 2, 3, 2),
1028 TEGRA186_MAIN_GPIO_PORT(CC, 5, 2, 4),
1031 static const struct tegra_gpio_soc tegra186_main_soc = {
1032 .num_ports = ARRAY_SIZE(tegra186_main_ports),
1033 .ports = tegra186_main_ports,
1034 .name = "tegra186-gpio",
1036 .num_irqs_per_bank = 1,
1037 .has_vm_support = false,
1040 #define TEGRA186_AON_GPIO_PORT(_name, _bank, _port, _pins) \
1041 [TEGRA186_AON_GPIO_PORT_##_name] = { \
1048 static const struct tegra_gpio_port tegra186_aon_ports[] = {
1049 TEGRA186_AON_GPIO_PORT( S, 0, 1, 5),
1050 TEGRA186_AON_GPIO_PORT( U, 0, 2, 6),
1051 TEGRA186_AON_GPIO_PORT( V, 0, 4, 8),
1052 TEGRA186_AON_GPIO_PORT( W, 0, 5, 8),
1053 TEGRA186_AON_GPIO_PORT( Z, 0, 7, 4),
1054 TEGRA186_AON_GPIO_PORT(AA, 0, 6, 8),
1055 TEGRA186_AON_GPIO_PORT(EE, 0, 3, 3),
1056 TEGRA186_AON_GPIO_PORT(FF, 0, 0, 5),
1059 static const struct tegra_gpio_soc tegra186_aon_soc = {
1060 .num_ports = ARRAY_SIZE(tegra186_aon_ports),
1061 .ports = tegra186_aon_ports,
1062 .name = "tegra186-gpio-aon",
1064 .num_irqs_per_bank = 1,
1065 .has_vm_support = false,
1068 #define TEGRA194_MAIN_GPIO_PORT(_name, _bank, _port, _pins) \
1069 [TEGRA194_MAIN_GPIO_PORT_##_name] = { \
1076 static const struct tegra_gpio_port tegra194_main_ports[] = {
1077 TEGRA194_MAIN_GPIO_PORT( A, 1, 2, 8),
1078 TEGRA194_MAIN_GPIO_PORT( B, 4, 7, 2),
1079 TEGRA194_MAIN_GPIO_PORT( C, 4, 3, 8),
1080 TEGRA194_MAIN_GPIO_PORT( D, 4, 4, 4),
1081 TEGRA194_MAIN_GPIO_PORT( E, 4, 5, 8),
1082 TEGRA194_MAIN_GPIO_PORT( F, 4, 6, 6),
1083 TEGRA194_MAIN_GPIO_PORT( G, 4, 0, 8),
1084 TEGRA194_MAIN_GPIO_PORT( H, 4, 1, 8),
1085 TEGRA194_MAIN_GPIO_PORT( I, 4, 2, 5),
1086 TEGRA194_MAIN_GPIO_PORT( J, 5, 1, 6),
1087 TEGRA194_MAIN_GPIO_PORT( K, 3, 0, 8),
1088 TEGRA194_MAIN_GPIO_PORT( L, 3, 1, 4),
1089 TEGRA194_MAIN_GPIO_PORT( M, 2, 3, 8),
1090 TEGRA194_MAIN_GPIO_PORT( N, 2, 4, 3),
1091 TEGRA194_MAIN_GPIO_PORT( O, 5, 0, 6),
1092 TEGRA194_MAIN_GPIO_PORT( P, 2, 5, 8),
1093 TEGRA194_MAIN_GPIO_PORT( Q, 2, 6, 8),
1094 TEGRA194_MAIN_GPIO_PORT( R, 2, 7, 6),
1095 TEGRA194_MAIN_GPIO_PORT( S, 3, 3, 8),
1096 TEGRA194_MAIN_GPIO_PORT( T, 3, 4, 8),
1097 TEGRA194_MAIN_GPIO_PORT( U, 3, 5, 1),
1098 TEGRA194_MAIN_GPIO_PORT( V, 1, 0, 8),
1099 TEGRA194_MAIN_GPIO_PORT( W, 1, 1, 2),
1100 TEGRA194_MAIN_GPIO_PORT( X, 2, 0, 8),
1101 TEGRA194_MAIN_GPIO_PORT( Y, 2, 1, 8),
1102 TEGRA194_MAIN_GPIO_PORT( Z, 2, 2, 8),
1103 TEGRA194_MAIN_GPIO_PORT(FF, 3, 2, 2),
1104 TEGRA194_MAIN_GPIO_PORT(GG, 0, 0, 2)
1107 static const struct tegra186_pin_range tegra194_main_pin_ranges[] = {
1108 { TEGRA194_MAIN_GPIO(GG, 0), "pex_l5_clkreq_n_pgg0" },
1109 { TEGRA194_MAIN_GPIO(GG, 1), "pex_l5_rst_n_pgg1" },
1112 static const struct tegra_gpio_soc tegra194_main_soc = {
1113 .num_ports = ARRAY_SIZE(tegra194_main_ports),
1114 .ports = tegra194_main_ports,
1115 .name = "tegra194-gpio",
1117 .num_irqs_per_bank = 8,
1118 .num_pin_ranges = ARRAY_SIZE(tegra194_main_pin_ranges),
1119 .pin_ranges = tegra194_main_pin_ranges,
1120 .pinmux = "nvidia,tegra194-pinmux",
1121 .has_vm_support = true,
1124 #define TEGRA194_AON_GPIO_PORT(_name, _bank, _port, _pins) \
1125 [TEGRA194_AON_GPIO_PORT_##_name] = { \
1132 static const struct tegra_gpio_port tegra194_aon_ports[] = {
1133 TEGRA194_AON_GPIO_PORT(AA, 0, 3, 8),
1134 TEGRA194_AON_GPIO_PORT(BB, 0, 4, 4),
1135 TEGRA194_AON_GPIO_PORT(CC, 0, 1, 8),
1136 TEGRA194_AON_GPIO_PORT(DD, 0, 2, 3),
1137 TEGRA194_AON_GPIO_PORT(EE, 0, 0, 7)
1140 static const struct tegra_gpio_soc tegra194_aon_soc = {
1141 .num_ports = ARRAY_SIZE(tegra194_aon_ports),
1142 .ports = tegra194_aon_ports,
1143 .name = "tegra194-gpio-aon",
1145 .num_irqs_per_bank = 8,
1147 .has_vm_support = false,
1150 #define TEGRA234_MAIN_GPIO_PORT(_name, _bank, _port, _pins) \
1151 [TEGRA234_MAIN_GPIO_PORT_##_name] = { \
1158 static const struct tegra_gpio_port tegra234_main_ports[] = {
1159 TEGRA234_MAIN_GPIO_PORT( A, 0, 0, 8),
1160 TEGRA234_MAIN_GPIO_PORT( B, 0, 3, 1),
1161 TEGRA234_MAIN_GPIO_PORT( C, 5, 1, 8),
1162 TEGRA234_MAIN_GPIO_PORT( D, 5, 2, 4),
1163 TEGRA234_MAIN_GPIO_PORT( E, 5, 3, 8),
1164 TEGRA234_MAIN_GPIO_PORT( F, 5, 4, 6),
1165 TEGRA234_MAIN_GPIO_PORT( G, 4, 0, 8),
1166 TEGRA234_MAIN_GPIO_PORT( H, 4, 1, 8),
1167 TEGRA234_MAIN_GPIO_PORT( I, 4, 2, 7),
1168 TEGRA234_MAIN_GPIO_PORT( J, 5, 0, 6),
1169 TEGRA234_MAIN_GPIO_PORT( K, 3, 0, 8),
1170 TEGRA234_MAIN_GPIO_PORT( L, 3, 1, 4),
1171 TEGRA234_MAIN_GPIO_PORT( M, 2, 0, 8),
1172 TEGRA234_MAIN_GPIO_PORT( N, 2, 1, 8),
1173 TEGRA234_MAIN_GPIO_PORT( P, 2, 2, 8),
1174 TEGRA234_MAIN_GPIO_PORT( Q, 2, 3, 8),
1175 TEGRA234_MAIN_GPIO_PORT( R, 2, 4, 6),
1176 TEGRA234_MAIN_GPIO_PORT( X, 1, 0, 8),
1177 TEGRA234_MAIN_GPIO_PORT( Y, 1, 1, 8),
1178 TEGRA234_MAIN_GPIO_PORT( Z, 1, 2, 8),
1179 TEGRA234_MAIN_GPIO_PORT(AC, 0, 1, 8),
1180 TEGRA234_MAIN_GPIO_PORT(AD, 0, 2, 4),
1181 TEGRA234_MAIN_GPIO_PORT(AE, 3, 3, 2),
1182 TEGRA234_MAIN_GPIO_PORT(AF, 3, 4, 4),
1183 TEGRA234_MAIN_GPIO_PORT(AG, 3, 2, 8),
1186 static const struct tegra_gpio_soc tegra234_main_soc = {
1187 .num_ports = ARRAY_SIZE(tegra234_main_ports),
1188 .ports = tegra234_main_ports,
1189 .name = "tegra234-gpio",
1191 .num_irqs_per_bank = 8,
1192 .has_vm_support = true,
1195 #define TEGRA234_AON_GPIO_PORT(_name, _bank, _port, _pins) \
1196 [TEGRA234_AON_GPIO_PORT_##_name] = { \
1203 static const struct tegra_gpio_port tegra234_aon_ports[] = {
1204 TEGRA234_AON_GPIO_PORT(AA, 0, 4, 8),
1205 TEGRA234_AON_GPIO_PORT(BB, 0, 5, 4),
1206 TEGRA234_AON_GPIO_PORT(CC, 0, 2, 8),
1207 TEGRA234_AON_GPIO_PORT(DD, 0, 3, 3),
1208 TEGRA234_AON_GPIO_PORT(EE, 0, 0, 8),
1209 TEGRA234_AON_GPIO_PORT(GG, 0, 1, 1),
1212 static const struct tegra_gpio_soc tegra234_aon_soc = {
1213 .num_ports = ARRAY_SIZE(tegra234_aon_ports),
1214 .ports = tegra234_aon_ports,
1215 .name = "tegra234-gpio-aon",
1217 .num_irqs_per_bank = 8,
1219 .has_vm_support = false,
1222 #define TEGRA241_MAIN_GPIO_PORT(_name, _bank, _port, _pins) \
1223 [TEGRA241_MAIN_GPIO_PORT_##_name] = { \
1230 static const struct tegra_gpio_port tegra241_main_ports[] = {
1231 TEGRA241_MAIN_GPIO_PORT(A, 0, 0, 8),
1232 TEGRA241_MAIN_GPIO_PORT(B, 0, 1, 8),
1233 TEGRA241_MAIN_GPIO_PORT(C, 0, 2, 2),
1234 TEGRA241_MAIN_GPIO_PORT(D, 0, 3, 6),
1235 TEGRA241_MAIN_GPIO_PORT(E, 0, 4, 8),
1236 TEGRA241_MAIN_GPIO_PORT(F, 1, 0, 8),
1237 TEGRA241_MAIN_GPIO_PORT(G, 1, 1, 8),
1238 TEGRA241_MAIN_GPIO_PORT(H, 1, 2, 8),
1239 TEGRA241_MAIN_GPIO_PORT(J, 1, 3, 8),
1240 TEGRA241_MAIN_GPIO_PORT(K, 1, 4, 4),
1241 TEGRA241_MAIN_GPIO_PORT(L, 1, 5, 6),
1244 static const struct tegra_gpio_soc tegra241_main_soc = {
1245 .num_ports = ARRAY_SIZE(tegra241_main_ports),
1246 .ports = tegra241_main_ports,
1247 .name = "tegra241-gpio",
1249 .num_irqs_per_bank = 8,
1250 .has_vm_support = false,
1253 #define TEGRA241_AON_GPIO_PORT(_name, _bank, _port, _pins) \
1254 [TEGRA241_AON_GPIO_PORT_##_name] = { \
1261 static const struct tegra_gpio_port tegra241_aon_ports[] = {
1262 TEGRA241_AON_GPIO_PORT(AA, 0, 0, 8),
1263 TEGRA241_AON_GPIO_PORT(BB, 0, 0, 4),
1266 static const struct tegra_gpio_soc tegra241_aon_soc = {
1267 .num_ports = ARRAY_SIZE(tegra241_aon_ports),
1268 .ports = tegra241_aon_ports,
1269 .name = "tegra241-gpio-aon",
1271 .num_irqs_per_bank = 8,
1272 .has_vm_support = false,
1275 static const struct of_device_id tegra186_gpio_of_match[] = {
1277 .compatible = "nvidia,tegra186-gpio",
1278 .data = &tegra186_main_soc
1280 .compatible = "nvidia,tegra186-gpio-aon",
1281 .data = &tegra186_aon_soc
1283 .compatible = "nvidia,tegra194-gpio",
1284 .data = &tegra194_main_soc
1286 .compatible = "nvidia,tegra194-gpio-aon",
1287 .data = &tegra194_aon_soc
1289 .compatible = "nvidia,tegra234-gpio",
1290 .data = &tegra234_main_soc
1292 .compatible = "nvidia,tegra234-gpio-aon",
1293 .data = &tegra234_aon_soc
1298 MODULE_DEVICE_TABLE(of, tegra186_gpio_of_match);
1300 static const struct acpi_device_id tegra186_gpio_acpi_match[] = {
1301 { .id = "NVDA0108", .driver_data = (kernel_ulong_t)&tegra186_main_soc },
1302 { .id = "NVDA0208", .driver_data = (kernel_ulong_t)&tegra186_aon_soc },
1303 { .id = "NVDA0308", .driver_data = (kernel_ulong_t)&tegra194_main_soc },
1304 { .id = "NVDA0408", .driver_data = (kernel_ulong_t)&tegra194_aon_soc },
1305 { .id = "NVDA0508", .driver_data = (kernel_ulong_t)&tegra241_main_soc },
1306 { .id = "NVDA0608", .driver_data = (kernel_ulong_t)&tegra241_aon_soc },
1309 MODULE_DEVICE_TABLE(acpi, tegra186_gpio_acpi_match);
1311 static struct platform_driver tegra186_gpio_driver = {
1313 .name = "tegra186-gpio",
1314 .of_match_table = tegra186_gpio_of_match,
1315 .acpi_match_table = tegra186_gpio_acpi_match,
1317 .probe = tegra186_gpio_probe,
1319 module_platform_driver(tegra186_gpio_driver);
1321 MODULE_DESCRIPTION("NVIDIA Tegra186 GPIO controller driver");
1322 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
1323 MODULE_LICENSE("GPL v2");