From: Georgi Vlaev <gvlaev@xxxxxxxxxxx>
This driver exports the CB FPGA presence detect bits from a
single 32bit CB register as GPIOs.
Signed-off-by: Georgi Vlaev <gvlaev@xxxxxxxxxxx>
Signed-off-by: Guenter Roeck <groeck@xxxxxxxxxxx>
[Ported from Juniper kernel]
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
---
drivers/gpio/Kconfig | 12 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-cbc-presence.c | 460 +++++++++++++++++++++++++++++++++++++++
3 files changed, 473 insertions(+)
create mode 100644 drivers/gpio/gpio-cbc-presence.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b29f521..ef8f408 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -158,6 +158,18 @@ config GPIO_CBC
This driver can also be built as a module. If so, the module
will be called gpio-cbc.
+config GPIO_CBC_PRESENCE
+ tristate "Juniper Networks PTX1K CBC presence detect as GPIO"
+ depends on MFD_JUNIPER_CBC && OF
+ default y if JNX_CONNECTOR
+ help
+ This driver exports the CH_PRS and OTHER_CH_PRS presence detect
+ bits of the PTX1K RCB CBC FPGA as GPIOs on the relevant Juniper
+ platforms. Select if JNX_CONNECTOR is selected.
+
+ This driver can also be built as a module. If so, the module
+ will be called gpio-cbc-presence.
+
config GPIO_CLPS711X
tristate "CLPS711X GPIO support"
depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 78dd0d4..825c2636 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o
obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.o
obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
obj-$(CONFIG_GPIO_CBC) += gpio-cbc.o
+obj-$(CONFIG_GPIO_CBC_PRESENCE) += gpio-cbc-presence.o
obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o
obj-$(CONFIG_GPIO_CS5535) += gpio-cs5535.o
obj-$(CONFIG_GPIO_CRYSTAL_COVE) += gpio-crystalcove.o
diff --git a/drivers/gpio/gpio-cbc-presence.c b/drivers/gpio/gpio-cbc-presence.c
new file mode 100644
index 0000000..ab16c0b
--- /dev/null
+++ b/drivers/gpio/gpio-cbc-presence.c
@@ -0,0 +1,460 @@
+/*
+ * Juniper Networks PTX1K CBC presence detect as GPIO driver
+ *
+ * Copyright (c) 2014, Juniper Networks
+ * Author: Georgi Vlaev <gvlaev@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/gpio.h>
+#include <linux/errno.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/mfd/cbc-core.h>
+
+/*
+ * PTX1K RCB CBC:
+ * We have 26 presence bits in 2 regs.
+ * Interrupts are raised per bit change in a reg (2 ints)
+ *
+ * CBC_TOP_REGS_CH_PRS:
+ * FPC[7:0] -> FPC[7:0]
+ * FAN[16] -> FAN[0]
+ * CB[22:21] -> CB[1:0]
+ * FPD[23]
+ * OTHER_RE[26]
+ *
+ * CBC_TOP_REGS_OTHER_CH_PRS:
+ * PSM[4:0]
+ * SIB[10:5] -> SIB[5:0]
+ * SFPP[21:20] -> SFPP[1:0]
+ */
+
+/*
+ * struct cbc_presence_gpio - GPIO private data structure.
+ * @base: PCI base address of Memory mapped I/O register.
+ * @dev: Pointer to device structure.
+ * @gpio: Data for GPIO infrastructure.
+ */
+struct cbc_presence_gpio {
+ void __iomem *base;
+ struct device *dev;
+ struct gpio_chip gpio;
+ struct mutex irq_lock;
+ struct mutex work_lock;
+ struct irq_domain *domain;
+ int irq;
+ u32 reg;
+ unsigned long presence_cache;
+ unsigned long presence_irq_enabled;
+ unsigned long mask;
+ unsigned long always_present;
+ unsigned long poll_interval;
+ u8 irq_type[32];
+ struct delayed_work work;
+};
+
+static u32 cbc_presence_read(struct cbc_presence_gpio *cpg)
+{
+ return ioread32(cpg->base + cpg->reg) | cpg->always_present;
+}
+
+static int cbc_presence_gpio_get(struct gpio_chip *gc, unsigned int nr)
+{
+ struct cbc_presence_gpio *cpg =
+ container_of(gc, struct cbc_presence_gpio, gpio);
+ unsigned long data, pos, ord = 0;
+
+ data = cbc_presence_read(cpg);
+ for_each_set_bit(pos, &cpg->mask, fls(cpg->mask)) {
+ if (ord == nr)
+ return !!test_bit(ord, &data);
+ ord++;
+ }
+ return 0;
+}
+
+static int cbc_presence_gpio_direction_input(struct gpio_chip *gc,
+ unsigned int nr)
+{
+ /* all pins are input pins */
+ return 0;
+}
+
+static int cbc_presence_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
+{
+ struct cbc_presence_gpio *cpg = container_of(gc,
+ struct cbc_presence_gpio, gpio);
+
+ return irq_create_mapping(cpg->domain, offset);
+}
+
+static void cbc_presence_irq_mask(struct irq_data *data)
+{
+ struct cbc_presence_gpio *cpg = irq_data_get_irq_chip_data(data);
+
+ clear_bit(data->hwirq, &cpg->presence_irq_enabled);
+}
+
+static void cbc_presence_irq_unmask(struct irq_data *data)
+{
+ struct cbc_presence_gpio *cpg = irq_data_get_irq_chip_data(data);
+
+ set_bit(data->hwirq, &cpg->presence_irq_enabled);
+}
+
+static int cbc_presence_irq_set_type(struct irq_data *data, unsigned int type)
+{
+ struct cbc_presence_gpio *cpg = irq_data_get_irq_chip_data(data);
+
+ cpg->irq_type[data->hwirq] = type & 0x0f;
+
+ return 0;
+}
+
+static void cbc_presence_irq_bus_lock(struct irq_data *data)
+{
+ struct cbc_presence_gpio *cpg = irq_data_get_irq_chip_data(data);
+
+ mutex_lock(&cpg->irq_lock);
+}
+
+static void cbc_presence_irq_bus_unlock(struct irq_data *data)
+{
+ struct cbc_presence_gpio *cpg = irq_data_get_irq_chip_data(data);
+
+ /* Synchronize interrupts to chip */
+
+ mutex_unlock(&cpg->irq_lock);
+}
+
+static struct irq_chip cbc_presence_irq_chip = {
+ .name = "gpio-cbc-presence",
+ .irq_mask = cbc_presence_irq_mask,
+ .irq_unmask = cbc_presence_irq_unmask,
+ .irq_set_type = cbc_presence_irq_set_type,
+ .irq_bus_lock = cbc_presence_irq_bus_lock,
+ .irq_bus_sync_unlock = cbc_presence_irq_bus_unlock,
+};
+
+static int cbc_presence_gpio_irq_map(struct irq_domain *domain,
+ unsigned int irq, irq_hw_number_t hwirq)
+{
+ irq_set_chip_data(irq, domain->host_data);
+ irq_set_chip(irq, &cbc_presence_irq_chip);
+ irq_set_nested_thread(irq, true);
+ irq_set_noprobe(irq);
+
+ return 0;
+}
+
+static const struct irq_domain_ops cbc_presence_gpio_irq_domain_ops = {
+ .map = cbc_presence_gpio_irq_map,
+ .xlate = irq_domain_xlate_twocell,
+};
+
+static void cbc_presence_gpio_irq_work(struct cbc_presence_gpio *cpg)
+{
+ unsigned long data, pos, ord = 0;
+
+ data = cbc_presence_read(cpg);
+
+ mutex_lock(&cpg->work_lock);
+ for_each_set_bit(pos, &cpg->mask, fls(cpg->mask)) {
+ int type, bit;
+
+ if (!test_bit(ord, &cpg->presence_irq_enabled)) {
+ ord++;
+ continue;
+ }
+
+ bit = test_bit(pos, &data);
+ if (bit == test_bit(pos, &cpg->presence_cache)) {
+ ord++;
+ continue;
+ }
+
+ type = cpg->irq_type[ord];
+ /*
+ * check irq->type for match. Only handle edge triggered
+ * interrupts; anything else doesn't make sense here.
+ */
+ if (((type & IRQ_TYPE_EDGE_RISING) && bit) ||
+ ((type & IRQ_TYPE_EDGE_FALLING) && !bit)) {
+ int virq = irq_find_mapping(cpg->domain, ord);
+
+ handle_nested_irq(virq);
+ }
+ ord++;
+ }
+ cpg->presence_cache = data;
+ mutex_unlock(&cpg->work_lock);
+}
+
+static irqreturn_t cbc_presence_gpio_irq_handler(int irq, void *data)
+{
+ struct cbc_presence_gpio *cpg = data;
+
+ cbc_presence_gpio_irq_work(cpg);
+
+ return IRQ_HANDLED;
+}
+
+static void cbc_presence_gpio_worker(struct work_struct *work)
+{
+ struct cbc_presence_gpio *cpg =
+ container_of(work, struct cbc_presence_gpio, work.work);
+
+ cbc_presence_gpio_irq_work(cpg);
+ schedule_delayed_work(&cpg->work,
+ msecs_to_jiffies(cpg->poll_interval));
+}
+
+static int cbc_presence_gpio_irq_setup(struct device *dev,
+ struct cbc_presence_gpio *cpg)
+{
+ int ret;
+
+ cpg->domain = irq_domain_add_linear(dev->of_node,
+ hweight_long(cpg->mask),
+ &cbc_presence_gpio_irq_domain_ops,
+ cpg);
+
+ if (cpg->domain == NULL)
+ return -ENOMEM;
+
+ INIT_DELAYED_WORK(&cpg->work, cbc_presence_gpio_worker);
+
+ if (cpg->irq) {
+ dev_info(dev, "Setting up interrupt %d\n", cpg->irq);
+ ret = devm_request_threaded_irq(dev, cpg->irq, NULL,
+ cbc_presence_gpio_irq_handler,
+ IRQF_ONESHOT,
+ dev_name(dev), cpg);
+ if (ret)
+ goto out_remove_domain;
+ } else {
+ schedule_delayed_work(&cpg->work, 1);
+ }
+
+ cpg->gpio.to_irq = cbc_presence_gpio_to_irq;
+
+ return 0;
+
+out_remove_domain:
+ irq_domain_remove(cpg->domain);
+ return ret;
+}
+
+static void cbc_presence_gpio_irq_teardown(struct device *dev,
+ struct cbc_presence_gpio *cpg)
+{
+ int i;
+
+ if (!cpg->irq)
+ cancel_delayed_work_sync(&cpg->work);
+
+ for (i = 0; i < cpg->gpio.ngpio; i++) {
+ int irq = irq_find_mapping(cpg->domain, i);
+
+ if (irq > 0)
+ irq_dispose_mapping(irq);
+ }
+ irq_domain_remove(cpg->domain);
+}
+
+static int cbc_presence_gpio_of_xlate(struct gpio_chip *gpio,
+ const struct of_phandle_args *gpiospec,
+ u32 *flags)
+{
+ if (WARN_ON(gpio->of_gpio_n_cells < 2))
+ return -EINVAL;
+
+ if (WARN_ON(gpiospec->args_count < gpio->of_gpio_n_cells))
+ return -EINVAL;
+
+ if (gpiospec->args[0] > gpio->ngpio)
+ return -EINVAL;
+
+ if (flags)
+ *flags = gpiospec->args[1] >> 16;
+
+ return gpiospec->args[0];
+}
+
+static void cbc_presence_gpio_setup(struct cbc_presence_gpio *cpg)
+{
+ struct gpio_chip *gpio = &cpg->gpio;
+
+ gpio->label = dev_name(cpg->dev);
+ gpio->owner = THIS_MODULE;
+ gpio->get = cbc_presence_gpio_get;
+ gpio->direction_input = cbc_presence_gpio_direction_input;
+ gpio->dbg_show = NULL;
+ gpio->base = -1;
+ gpio->ngpio = hweight_long(cpg->mask);
+ gpio->can_sleep = 0;
+ gpio->of_node = cpg->dev->of_node;
+ gpio->of_xlate = cbc_presence_gpio_of_xlate;
+ gpio->of_gpio_n_cells = 2;
+}
+
+static int cbc_presence_of_setup(struct cbc_presence_gpio *cpg)
+{
+ struct device *dev = cpg->dev;
+ struct device_node *node = dev->of_node;
+ u32 value;
+ int ret;
+
+ /* reg := CBC_TOP_REGS_CH_PRS | CBC_TOP_REGS_OTHER_CH_PRS */
+ ret = of_property_read_u32(node, "reg", &value);
+ if (ret) {
+ dev_err(dev, "failed to read the <reg> property.\n");
+ return ret;
+ }
+ cpg->reg = value;
+
+ /* mask := valid presence bits in <reg> */
+ ret = of_property_read_u32(node, "mask", &value);
+ if (ret)
+ value = 0xffffffff;
+ cpg->mask = value;
+
+ /*
+ * always-present := some frus are always present, but not reported
+ * e.g MP/BP on PTX1K & PTX3K
+ */
+ ret = of_property_read_u32(node, "always-present", &value);
+ if (ret)
+ value = 0;
+ cpg->always_present = value;
+
+ /*
+ * poll-interval := some CBC releses don't support interrupts.
+ * Default poll interval is 1000 msec
+ */
+ ret = of_property_read_u32(node, "poll-interval", &value);
+ if (ret)
+ value = 1000;
+ cpg->poll_interval = value;
+
+ return 0;
+}
+
+static int cbc_presence_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cbc_presence_gpio *cpg;
+ struct resource *res;
+ int ret;
+
+ cpg = devm_kzalloc(dev, sizeof(struct cbc_presence_gpio),
+ GFP_KERNEL);
+ if (cpg == NULL)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ cpg->base = devm_ioremap_nocache(dev, res->start, resource_size(res));
+ if (IS_ERR(cpg->base))
+ return -ENOMEM;
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret > 0)
+ cpg->irq = ret;
+
+ cpg->dev = dev;
+ mutex_init(&cpg->irq_lock);
+ mutex_init(&cpg->work_lock);
+
+ ret = cbc_presence_of_setup(cpg);
+ if (ret)
+ return -ENODEV;
+
+ cbc_presence_gpio_setup(cpg);
+
+ /* cache the current presence */
+ cpg->presence_cache = cbc_presence_read(cpg);
+
+ ret = cbc_presence_gpio_irq_setup(dev, cpg);
+ if (ret < 0) {
+ dev_err(dev, "Failed to setup CBC presence irqs\n");
+ return ret;
+ }
+
+ ret = gpiochip_add(&cpg->gpio);
+ if (ret) {
+ dev_err(dev, "Failed to register CBC presence gpio\n");
+ goto err;
+ }
+
+ platform_set_drvdata(pdev, cpg);
+
+ return 0;
+err:
+ gpiochip_remove(&cpg->gpio);
+
+ if (cpg->domain)
+ cbc_presence_gpio_irq_teardown(dev, cpg);
+
+ return ret;
+}
+
+static int cbc_presence_gpio_remove(struct platform_device *pdev)
+{
+ struct cbc_presence_gpio *cpg = platform_get_drvdata(pdev);
+
+ cancel_delayed_work_sync(&cpg->work);
+ if (cpg->domain)
+ cbc_presence_gpio_irq_teardown(&pdev->dev, cpg);
+
+ gpiochip_remove(&cpg->gpio);
+
+ return 0;
+}
+
+static const struct of_device_id cbc_presence_gpio_ids[] = {
+ { .compatible = "jnx,gpio-cbc-presence", },
+ /*
+ * These are the same devices ... MFD OF hackery to
+ * get around the single of_node compatible match
+ * mfd_add_device() for the OTHER_CH_PRESENCE
+ */
+ { .compatible = "jnx,gpio-cbc-presence-other", },
+ { .compatible = "jnx,gpio-cbc-presence-sib", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, cbc_presence_gpio_ids);
+
+static struct platform_driver cbc_presence_gpio_driver = {
+ .driver = {
+ .name = "gpio-cbc-presence",
+ .owner = THIS_MODULE,
+ .of_match_table = cbc_presence_gpio_ids,
+ },
+ .probe = cbc_presence_gpio_probe,
+ .remove = cbc_presence_gpio_remove,
+};
+module_platform_driver(cbc_presence_gpio_driver);
+
+MODULE_DESCRIPTION("Juniper Networks CB presence detect as GPIO driver");
+MODULE_AUTHOR("Georgi Vlaev <gvlaev@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
1.9.1
--
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