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gpio: tegra186: Support multiple interrupts per bank

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Tegra194 and later support more than a single interrupt per bank. This
is primarily useful for virtualization but can also be helpful for more
fine-grained CPU affinity control. To keep things simple for now, route
all pins to the first interrupt.

For backwards-compatibility, support old device trees that specify only
one interrupt per bank by counting the interrupts at probe time.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
This commit is contained in:
Thierry Reding 2021-09-17 12:54:12 +02:00 committed by Bartosz Golaszewski
parent ca03874806
commit 2103868047
1 changed files with 41 additions and 7 deletions
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48
drivers/gpio/gpio-tegra186.c
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@ -69,6 +69,8 @@ struct tegra_gpio_soc {
const char *name;
unsigned int instance;
unsigned int num_irqs_per_bank;
const struct tegra186_pin_range *pin_ranges;
unsigned int num_pin_ranges;
const char *pinmux;
@ -452,7 +454,7 @@ static void tegra186_gpio_irq(struct irq_desc *desc)
struct irq_domain *domain = gpio->gpio.irq.domain;
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned int parent = irq_desc_get_irq(desc);
unsigned int i, offset = 0;
unsigned int i, j, offset = 0;
chained_irq_enter(chip, desc);
@ -465,7 +467,12 @@ static void tegra186_gpio_irq(struct irq_desc *desc)
base = gpio->base + port->bank * 0x1000 + port->port * 0x200;
/* skip ports that are not associated with this bank */
if (parent != gpio->irq[port->bank])
for (j = 0; j < gpio->num_irqs_per_bank; j++) {
if (parent == gpio->irq[port->bank * gpio->num_irqs_per_bank + j])
break;
}
if (j == gpio->num_irqs_per_bank)
goto skip;
value = readl(base + TEGRA186_GPIO_INTERRUPT_STATUS(1));
@ -567,6 +574,7 @@ static const struct of_device_id tegra186_pmc_of_match[] = {
static void tegra186_gpio_init_route_mapping(struct tegra_gpio *gpio)
{
struct device *dev = gpio->gpio.parent;
unsigned int i, j;
u32 value;
@ -585,12 +593,30 @@ static void tegra186_gpio_init_route_mapping(struct tegra_gpio *gpio)
*/
if ((value & TEGRA186_GPIO_CTL_SCR_SEC_REN) == 0 &&
(value & TEGRA186_GPIO_CTL_SCR_SEC_WEN) == 0) {
for (j = 0; j < 8; j++) {
/*
* On Tegra194 and later, each pin can be routed to one or more
* interrupts.
*/
for (j = 0; j < gpio->num_irqs_per_bank; j++) {
dev_dbg(dev, "programming default interrupt routing for port %s\n",
port->name);
offset = TEGRA186_GPIO_INT_ROUTE_MAPPING(p, j);
value = readl(base + offset);
value = BIT(port->pins) - 1;
writel(value, base + offset);
/*
* By default we only want to route GPIO pins to IRQ 0. This works
* only under the assumption that we're running as the host kernel
* and hence all GPIO pins are owned by Linux.
*
* For cases where Linux is the guest OS, the hypervisor will have
* to configure the interrupt routing and pass only the valid
* interrupts via device tree.
*/
if (j == 0) {
value = readl(base + offset);
value = BIT(port->pins) - 1;
writel(value, base + offset);
}
}
}
}
@ -610,6 +636,9 @@ static unsigned int tegra186_gpio_irqs_per_bank(struct tegra_gpio *gpio)
gpio->num_irqs_per_bank = gpio->num_irq / gpio->num_banks;
if (gpio->num_irqs_per_bank > gpio->soc->num_irqs_per_bank)
goto error;
return 0;
error:
@ -766,7 +795,8 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
irq->parents = gpio->irq;
}
tegra186_gpio_init_route_mapping(gpio);
if (gpio->soc->num_irqs_per_bank > 1)
tegra186_gpio_init_route_mapping(gpio);
np = of_find_matching_node(NULL, tegra186_pmc_of_match);
if (np) {
@ -833,6 +863,7 @@ static const struct tegra_gpio_soc tegra186_main_soc = {
.ports = tegra186_main_ports,
.name = "tegra186-gpio",
.instance = 0,
.num_irqs_per_bank = 1,
};
#define TEGRA186_AON_GPIO_PORT(_name, _bank, _port, _pins) \
@ -859,6 +890,7 @@ static const struct tegra_gpio_soc tegra186_aon_soc = {
.ports = tegra186_aon_ports,
.name = "tegra186-gpio-aon",
.instance = 1,
.num_irqs_per_bank = 1,
};
#define TEGRA194_MAIN_GPIO_PORT(_name, _bank, _port, _pins) \
@ -910,6 +942,7 @@ static const struct tegra_gpio_soc tegra194_main_soc = {
.ports = tegra194_main_ports,
.name = "tegra194-gpio",
.instance = 0,
.num_irqs_per_bank = 8,
.num_pin_ranges = ARRAY_SIZE(tegra194_main_pin_ranges),
.pin_ranges = tegra194_main_pin_ranges,
.pinmux = "nvidia,tegra194-pinmux",
@ -936,6 +969,7 @@ static const struct tegra_gpio_soc tegra194_aon_soc = {
.ports = tegra194_aon_ports,
.name = "tegra194-gpio-aon",
.instance = 1,
.num_irqs_per_bank = 8,
};
static const struct of_device_id tegra186_gpio_of_match[] = {