[PATCH v2 2/5] gpio: gxp: Add HPE GXP GPIO

From: nick . hawkins
Date: Wed May 31 2023 - 11:24:15 EST

From: Nick Hawkins <nick.hawkins@xxxxxxx>

The GXP SoC supports GPIO on multiple interfaces. The interfaces are
CPLD and Host. The GPIOs is a combination of both physical and virtual
I/O across the interfaces. The gpio-gxp driver specifically covers the
CSM(physical), FN2(virtual), and VUHC(virtual) which are the host. The
gpio-gxp-pl driver covers the CPLD which takes physical I/O from the
board and shares it with GXP via a propriety interface that maps the I/O
onto a specific register area of the GXP. The drivers both support
interrupts but from different interrupt parents.

Signed-off-by: Nick Hawkins <nick.hawkins@xxxxxxx>

---

v2:
*Separated code into two files to keep size down: gpio-gxp.c and
gpio-gxp-pl.c
*Fixed Kconfig indentation as well as add new entry for gpio-gxp-pl
*Removed use of linux/of.h and linux/of_device.h
*Added mod_devicetable.h and property.h
*Fixed indentation of defines and uses consistent number of digits
*Corrected defines with improper GPIO_ namespace.
*For masks now use BIT()
*Added comment for PLREG offsets
*Move gpio_chip to be first in structure
*Calculate offset for high and low byte GPIO reads instead of having
H(High) and L(Low) letters added to the variables.
*Removed repeditive use of "? 1 : 0"
*Switched to handle_bad_irq()
*Removed improper bailout on gpiochip_add_data
*Used GENMASK to arm interrupts
*Removed use of of_match_device
*fixed sizeof in devm_kzalloc
*Added COMPILE_TEST to Kconfig
*Added dev_err_probe
*Removed unecessary parent and compatible checks
---
drivers/gpio/Kconfig | 18 ++
drivers/gpio/Makefile | 2 +
drivers/gpio/gpio-gxp-pl.c | 536 +++++++++++++++++++++++++++++++
drivers/gpio/gpio-gxp.c | 637 +++++++++++++++++++++++++++++++++++++
4 files changed, 1193 insertions(+)
create mode 100644 drivers/gpio/gpio-gxp-pl.c
create mode 100644 drivers/gpio/gpio-gxp.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 13be729710f2..b0a24ef18392 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1235,6 +1235,24 @@ config HTC_EGPIO
several HTC phones. It provides basic support for input
pins, output pins, and IRQs.

+config GPIO_GXP
+ tristate "GXP GPIO support"
+ depends on ARCH_HPE_GXP || COMPILE_TEST
+ select GPIOLIB_IRQCHIP
+ help
+ Say Y here to support GXP GPIO controllers. It provides
+ support for the multiple GPIO interfaces available to be
+ available to the Host.
+
+config GPIO_GXP_PL
+ tristate "GXP GPIO PL support"
+ depends on ARCH_HPE_GXP || COMPILE_TEST
+ select GPIOLIB_IRQCHIP
+ help
+ Say Y here to support GXP GPIO PL controller. It provides
+ support for the GPIO PL interface available to be
+ available to the Host.
+
config GPIO_JANZ_TTL
tristate "Janz VMOD-TTL Digital IO Module"
depends on MFD_JANZ_CMODIO
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index c048ba003367..a401dd472c93 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -63,6 +63,8 @@ obj-$(CONFIG_GPIO_FTGPIO010) += gpio-ftgpio010.o
obj-$(CONFIG_GPIO_GE_FPGA) += gpio-ge.o
obj-$(CONFIG_GPIO_GPIO_MM) += gpio-gpio-mm.o
obj-$(CONFIG_GPIO_GRGPIO) += gpio-grgpio.o
+obj-$(CONFIG_GPIO_GXP) += gpio-gxp.o
+obj-$(CONFIG_GPIO_GXP_PL) += gpio-gxp-pl.o
obj-$(CONFIG_GPIO_GW_PLD) += gpio-gw-pld.o
obj-$(CONFIG_GPIO_HISI) += gpio-hisi.o
obj-$(CONFIG_GPIO_HLWD) += gpio-hlwd.o
diff --git a/drivers/gpio/gpio-gxp-pl.c b/drivers/gpio/gpio-gxp-pl.c
new file mode 100644
index 000000000000..3b27848d6bfc
--- /dev/null
+++ b/drivers/gpio/gpio-gxp-pl.c
@@ -0,0 +1,536 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2023 Hewlett-Packard Enterprise Development Company, L.P. */
+
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+/* Specific offsets in CPLD registers for interrupts */
+#define PLREG_INT_GRP_STAT_MASK 0x08
+#define PLREG_INT_HI_PRI_EN 0x0C
+#define PLREG_INT_GRP5_BASE 0x31
+#define PLREG_INT_GRP6_BASE 0x35
+#define PLREG_INT_GRP5_FLAG 0x30
+#define PLREG_INT_GRP6_FLAG 0x34
+
+/* Specific bits to enable Group 4 and Group 5 interrupts */
+#define PLREG_GRP4_GRP5_MASK GENMASK(5, 4)
+
+/* Specific offsets in CPLD registers */
+#define PLREG_IOP_LED 0x04
+#define PLREG_IDENT_LED 0x05
+#define PLREG_HEALTH_LED 0x0D
+#define PLREG_PSU_INST 0x19
+#define PLREG_PSU_AC 0x1B
+#define PLREG_PSU_DC 0x1C
+#define PLREG_FAN_INST 0x27
+#define PLREG_FAN_FAIL 0x29
+
+#define GXP_GPIO_DIR_OUT 0x00
+#define GXP_GPIO_DIR_IN 0x01
+
+enum pl_gpio_pn {
+ IOP_LED1 = 0,
+ IOP_LED2 = 1,
+ IOP_LED3 = 2,
+ IOP_LED4 = 3,
+ IOP_LED5 = 4,
+ IOP_LED6 = 5,
+ IOP_LED7 = 6,
+ IOP_LED8 = 7,
+ FAN1_INST = 8,
+ FAN2_INST = 9,
+ FAN3_INST = 10,
+ FAN4_INST = 11,
+ FAN5_INST = 12,
+ FAN6_INST = 13,
+ FAN7_INST = 14,
+ FAN8_INST = 15,
+ FAN1_FAIL = 16,
+ FAN2_FAIL = 17,
+ FAN3_FAIL = 18,
+ FAN4_FAIL = 19,
+ FAN5_FAIL = 20,
+ FAN6_FAIL = 21,
+ FAN7_FAIL = 22,
+ FAN8_FAIL = 23,
+ LED_IDENTIFY = 24,
+ LED_HEALTH_RED = 25,
+ LED_HEALTH_AMBER = 26,
+ PWR_BTN_INT = 27,
+ UID_PRESS_INT = 28,
+ SLP_INT = 29,
+ ACM_FORCE_OFF = 30,
+ ACM_REMOVED = 31,
+ ACM_REQ_N = 32,
+ PSU1_INST = 33,
+ PSU2_INST = 34,
+ PSU3_INST = 35,
+ PSU4_INST = 36,
+ PSU5_INST = 37,
+ PSU6_INST = 38,
+ PSU7_INST = 39,
+ PSU8_INST = 40,
+ PSU1_AC = 41,
+ PSU2_AC = 42,
+ PSU3_AC = 43,
+ PSU4_AC = 44,
+ PSU5_AC = 45,
+ PSU6_AC = 46,
+ PSU7_AC = 47,
+ PSU8_AC = 48,
+ PSU1_DC = 49,
+ PSU2_DC = 50,
+ PSU3_DC = 51,
+ PSU4_DC = 52,
+ PSU5_DC = 53,
+ PSU6_DC = 54,
+ PSU7_DC = 55,
+ PSU8_DC = 56,
+ RESET = 57,
+ NMI_OUT = 58,
+ VPBTN = 59,
+ PGOOD = 60,
+ PERST = 61,
+ POST_COMPLETE = 62,
+};
+
+/* Provide info for fan driver */
+u8 fan_presence;
+EXPORT_SYMBOL(fan_presence);
+
+u8 fan_fail;
+EXPORT_SYMBOL(fan_fail);
+
+/* Remember last PSU config */
+u8 psu_presence;
+
+struct gxp_gpio_drvdata {
+ struct regmap *base;
+ struct regmap *interrupt;
+ struct gpio_chip chip;
+ int irq;
+};
+
+static struct regmap *gxp_gpio_init_regmap(struct platform_device *pdev,
+ char *reg_name, u8 bits)
+{
+ struct regmap_config regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ };
+ void __iomem *base;
+
+ if (bits == 8) {
+ regmap_config.reg_bits = 8;
+ regmap_config.reg_stride = 1;
+ regmap_config.val_bits = 8;
+ regmap_config.max_register = 0xff;
+ }
+
+ base = devm_platform_ioremap_resource_byname(pdev, reg_name);
+ if (IS_ERR(base))
+ return ERR_CAST(base);
+
+ regmap_config.name = reg_name;
+
+ return devm_regmap_init_mmio(&pdev->dev, base, &regmap_config);
+}
+
+static int gxp_gpio_pl_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+ unsigned int val;
+ int ret = 0;
+
+ switch (offset) {
+ case IOP_LED1 ... IOP_LED8:
+ regmap_read(drvdata->base, PLREG_IOP_LED, &val);
+ ret = (val & BIT(offset)) ? 1 : 0;
+ break;
+ case FAN1_INST ...FAN8_INST:
+ regmap_read(drvdata->base, PLREG_FAN_INST, &val);
+ fan_presence = (u8)val;
+ ret = (fan_presence & BIT((offset - FAN1_INST))) ? 1 : 0;
+ break;
+ case FAN1_FAIL ... FAN8_FAIL:
+ regmap_read(drvdata->base, PLREG_FAN_FAIL, &val);
+ fan_fail = (u8)val;
+ ret = (fan_fail & BIT((offset - FAN1_FAIL))) ? 1 : 0;
+ break;
+ case PWR_BTN_INT ... SLP_INT:
+ regmap_read(drvdata->base, PLREG_INT_GRP5_FLAG, &val);
+ /* Active low */
+ ret = (val & BIT((offset - PWR_BTN_INT) + 16)) ? 0 : 1;
+ break;
+ case PSU1_INST ... PSU8_INST:
+ regmap_read(drvdata->base, PLREG_PSU_INST, &val);
+ psu_presence = (u8)val;
+ ret = (psu_presence & BIT((offset - PSU1_INST))) ? 1 : 0;
+ break;
+ case PSU1_AC ... PSU8_AC:
+ regmap_read(drvdata->base, PLREG_PSU_AC, &val);
+ ret = (val & BIT((offset - PSU1_AC))) ? 1 : 0;
+ break;
+ case PSU1_DC ... PSU8_DC:
+ regmap_read(drvdata->base, PLREG_PSU_DC, &val);
+ ret = (val & BIT((offset - PSU1_DC))) ? 1 : 0;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static void gxp_gpio_pl_set(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+
+ switch (offset) {
+ case IOP_LED1 ... IOP_LED8:
+ regmap_update_bits(drvdata->base,
+ PLREG_IOP_LED,
+ BIT(offset),
+ value == 0 ? 0 : BIT(offset));
+ break;
+ case LED_IDENTIFY:
+ regmap_update_bits(drvdata->base,
+ PLREG_IDENT_LED,
+ BIT(7) | BIT(6),
+ value == 0 ? BIT(7) : BIT(7) | BIT(6));
+ break;
+ case LED_HEALTH_RED:
+ regmap_update_bits(drvdata->base,
+ PLREG_HEALTH_LED,
+ BIT(7),
+ value == 0 ? 0 : BIT(7));
+ break;
+ case LED_HEALTH_AMBER:
+ regmap_update_bits(drvdata->base,
+ PLREG_HEALTH_LED,
+ BIT(6),
+ value == 0 ? 0 : BIT(6));
+ break;
+ default:
+ break;
+ }
+}
+
+static int gxp_gpio_pl_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+ int ret = GXP_GPIO_DIR_IN;
+
+ switch (offset) {
+ case IOP_LED1 ... IOP_LED8:
+ case LED_IDENTIFY ... LED_HEALTH_AMBER:
+ case ACM_FORCE_OFF:
+ case ACM_REQ_N:
+ ret = GXP_GPIO_DIR_OUT;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int gxp_gpio_pl_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ int ret = -EOPNOTSUPP;
+
+ switch (offset) {
+ case 8 ... 55:
+ ret = GXP_GPIO_DIR_OUT;
+ break;
+ case 59 ... 65:
+ ret = GXP_GPIO_DIR_OUT;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int gxp_gpio_pl_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ int ret = -EOPNOTSUPP;
+
+ switch (offset) {
+ case IOP_LED1 ... IOP_LED8:
+ case LED_IDENTIFY ... LED_HEALTH_AMBER:
+ case ACM_FORCE_OFF:
+ case ACM_REQ_N:
+ gxp_gpio_pl_set(chip, offset, value);
+ ret = GXP_GPIO_DIR_OUT;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static void gxp_gpio_pl_irq_ack(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+ unsigned int val;
+
+ /* Read latched interrupt for group 5 */
+ regmap_read(drvdata->interrupt, PLREG_INT_GRP5_FLAG, &val);
+ /* Clear latched interrupt */
+ regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP5_FLAG,
+ 0xFF, 0xFF);
+
+ /* Read latched interrupt for group 6 */
+ regmap_read(drvdata->interrupt, PLREG_INT_GRP6_FLAG, &val);
+ /* Clear latched interrupt */
+ regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP6_FLAG,
+ 0xFF, 0xFF);
+}
+
+static void gxp_gpio_pl_irq_set_mask(struct irq_data *d, bool set)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+
+ regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP5_BASE,
+ BIT(0) | BIT(2), set ? 0 : BIT(0) | BIT(2));
+
+ regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP6_BASE,
+ BIT(2), set ? 0 : BIT(2));
+}
+
+static void gxp_gpio_pl_irq_mask(struct irq_data *d)
+{
+ gxp_gpio_pl_irq_set_mask(d, false);
+}
+
+static void gxp_gpio_pl_irq_unmask(struct irq_data *d)
+{
+ gxp_gpio_pl_irq_set_mask(d, true);
+}
+
+static int gxp_gpio_irq_init_hw(struct gpio_chip *chip)
+{
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+
+ regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP5_BASE,
+ BIT(0) | BIT(2), 0);
+
+ regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP6_BASE,
+ BIT(2), 0);
+
+ return 0;
+}
+
+static int gxp_gpio_pl_set_type(struct irq_data *d, unsigned int type)
+{
+ if (type & IRQ_TYPE_LEVEL_MASK)
+ irq_set_handler_locked(d, handle_level_irq);
+ else
+ irq_set_handler_locked(d, handle_edge_irq);
+
+ return 0;
+}
+
+static irqreturn_t gxp_gpio_pl_irq_handle(int irq, void *_drvdata)
+{
+ struct gxp_gpio_drvdata *drvdata = (struct gxp_gpio_drvdata *)_drvdata;
+ unsigned int val, girq, i;
+
+ /* Check group 5 interrupts */
+
+ regmap_read(drvdata->base, PLREG_INT_GRP5_FLAG, &val);
+
+ if (val) {
+ for_each_set_bit(i, (unsigned long *)&val, 3) {
+ girq = irq_find_mapping(drvdata->chip.irq.domain,
+ i + PWR_BTN_INT);
+ generic_handle_irq(girq);
+ }
+
+ /* Clear latched interrupt */
+ regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP5_FLAG,
+ 0xFF, 0xFF);
+ regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP5_BASE,
+ BIT(0) | BIT(2), 0);
+ }
+
+ /* Check group 6 interrupts */
+
+ regmap_read(drvdata->base, PLREG_INT_GRP6_FLAG, &val);
+
+ if (val & BIT(2)) {
+ u8 old_psu = psu_presence;
+
+ regmap_read(drvdata->base, PLREG_PSU_INST, &val);
+ psu_presence = (u8)val;
+
+ if (old_psu != psu_presence) {
+ /* Identify all bits which differs */
+ u8 current_val = psu_presence;
+ u8 old_val = old_psu;
+
+ for (i = 0 ; i < 8 ; i++) {
+ if ((current_val & 0x1) != (old_val & 0x1)) {
+ /* PSU state has changed */
+ girq = irq_find_mapping(drvdata->chip.irq.domain,
+ i + PSU1_INST);
+ if (girq)
+ generic_handle_irq(girq);
+ }
+ current_val = current_val >> 1;
+ old_val = old_val >> 1;
+ }
+ }
+ }
+
+ /* Clear latched interrupt */
+ regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP6_FLAG,
+ 0xFF, 0xFF);
+ regmap_update_bits(drvdata->interrupt, PLREG_INT_GRP6_BASE,
+ BIT(2), 0);
+
+ return IRQ_HANDLED;
+}
+
+static struct gpio_chip plreg_chip = {
+ .label = "gxp_gpio_plreg",
+ .owner = THIS_MODULE,
+ .get = gxp_gpio_pl_get,
+ .set = gxp_gpio_pl_set,
+ .get_direction = gxp_gpio_pl_get_direction,
+ .direction_input = gxp_gpio_pl_direction_input,
+ .direction_output = gxp_gpio_pl_direction_output,
+ .base = -1,
+};
+
+static struct irq_chip gxp_plreg_irqchip = {
+ .name = "gxp_plreg",
+ .irq_ack = gxp_gpio_pl_irq_ack,
+ .irq_mask = gxp_gpio_pl_irq_mask,
+ .irq_unmask = gxp_gpio_pl_irq_unmask,
+ .irq_set_type = gxp_gpio_pl_set_type,
+};
+
+static int gxp_gpio_pl_init(struct platform_device *pdev)
+{
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
+ struct gpio_irq_chip *girq;
+ int ret;
+ unsigned int val;
+
+ drvdata->base = gxp_gpio_init_regmap(pdev, "base", 8);
+ if (IS_ERR(drvdata->base))
+ return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->base),
+ "failed to map base\n");
+
+ drvdata->interrupt = gxp_gpio_init_regmap(pdev, "interrupt", 8);
+ if (IS_ERR(drvdata->interrupt))
+ return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->interrupt),
+ "failed to map interrupt base\n");
+
+ regmap_read(drvdata->base, PLREG_FAN_INST, &val);
+ fan_presence = (u8)val;
+
+ regmap_read(drvdata->base, PLREG_FAN_FAIL, &val);
+ fan_fail = (u8)val;
+
+ regmap_read(drvdata->base, PLREG_PSU_INST, &val);
+ psu_presence = (u8)val;
+
+ drvdata->chip = plreg_chip;
+ drvdata->chip.ngpio = 57;
+ drvdata->chip.parent = &pdev->dev;
+
+ girq = &drvdata->chip.irq;
+ girq->chip = &gxp_plreg_irqchip;
+ girq->parent_handler = NULL;
+ girq->num_parents = 0;
+ girq->parents = NULL;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_bad_irq;
+
+ girq->init_hw = gxp_gpio_irq_init_hw;
+
+ ret = devm_gpiochip_add_data(&pdev->dev, &drvdata->chip, drvdata);
+ if (ret < 0)
+ dev_err_probe(&pdev->dev, ret, "Could not register gpiochip for plreg\n");
+
+ regmap_update_bits(drvdata->base,
+ PLREG_INT_HI_PRI_EN,
+ PLREG_GRP4_GRP5_MASK,
+ PLREG_GRP4_GRP5_MASK);
+ regmap_update_bits(drvdata->base,
+ PLREG_INT_GRP_STAT_MASK,
+ PLREG_GRP4_GRP5_MASK,
+ 0x00);
+ regmap_read(drvdata->base, PLREG_INT_HI_PRI_EN, &val);
+ regmap_read(drvdata->base, PLREG_INT_GRP_STAT_MASK, &val);
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0)
+ return dev_err_probe(&pdev->dev, ret, "Get irq from platform fail\n");
+
+ drvdata->irq = ret;
+
+ ret = devm_request_irq(&pdev->dev, drvdata->irq, gxp_gpio_pl_irq_handle,
+ IRQF_SHARED, "gxp-pl", drvdata);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static const struct of_device_id gxp_gpio_of_match[] = {
+ { .compatible = "hpe,gxp-gpio-pl" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, gxp_gpio_of_match);
+
+static int gxp_gpio_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct gxp_gpio_drvdata *drvdata;
+
+ /* Initialize global vars */
+ fan_presence = 0;
+ fan_fail = 0;
+ psu_presence = 0;
+
+ drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, drvdata);
+
+ ret = gxp_gpio_pl_init(pdev);
+
+ return ret;
+}
+
+static struct platform_driver gxp_gpio_driver = {
+ .driver = {
+ .name = "gxp-gpio-pl",
+ .of_match_table = gxp_gpio_of_match,
+ },
+ .probe = gxp_gpio_probe,
+};
+module_platform_driver(gxp_gpio_driver);
+
+MODULE_AUTHOR("Nick Hawkins <nick.hawkins@xxxxxxx>");
+MODULE_DESCRIPTION("GPIO PL interface for GXP");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpio/gpio-gxp.c b/drivers/gpio/gpio-gxp.c
new file mode 100644
index 000000000000..ed6d8577e6b7
--- /dev/null
+++ b/drivers/gpio/gpio-gxp.c
@@ -0,0 +1,637 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2023 Hewlett-Packard Enterprise Development Company, L.P. */
+
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#define GPIDAT 0x040
+#define GPODAT 0x0b0
+#define GPODAT2 0x0f8
+#define GPOOWN 0x110
+#define GPOOWN2 0x118
+#define ASR_OFS 0x05c
+
+#define GXP_GPIO_DIR_OUT 0
+#define GXP_GPIO_DIR_IN 1
+
+#define PGOOD_MASK BIT(0)
+
+struct gxp_gpio_drvdata {
+ struct gpio_chip chip;
+ struct regmap *csm_map;
+ void __iomem *fn2_vbtn;
+ struct regmap *fn2_stat;
+ struct regmap *vuhc0_map;
+ int irq;
+};
+
+/*
+ * Note: Instead of definining all PINs here are the select few that
+ * are specifically defined in DTS and offsets are used here.
+ */
+enum gxp_gpio_pn {
+ RESET = 192,
+ VPBTN = 210, /* aka POWER_OK */
+ PGOOD = 211, /* aka PS_PWROK */
+ PERST = 212, /* aka PCIERST */
+ POST_COMPLETE = 213,
+};
+
+static int gxp_gpio_csm_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+ int ret = 0;
+
+ switch (offset) {
+ case 0 ... 31:
+ regmap_read(drvdata->csm_map, GPIDAT, &ret);
+ ret = (ret & BIT(offset));
+ break;
+ case 32 ... 63:
+ regmap_read(drvdata->csm_map, GPIDAT + 0x20, &ret);
+ ret = (ret & BIT(offset - 32));
+ break;
+ case 64 ... 95:
+ regmap_read(drvdata->csm_map, GPODAT, &ret);
+ ret = (ret & BIT(offset - 64));
+ break;
+ case 96 ... 127:
+ regmap_read(drvdata->csm_map, GPODAT + 0x04, &ret);
+ ret = (ret & BIT(offset - 96));
+ break;
+ case 128 ... 159:
+ regmap_read(drvdata->csm_map, GPODAT2, &ret);
+ ret = (ret & BIT(offset - 128));
+ break;
+ case 160 ... 191:
+ regmap_read(drvdata->csm_map, GPODAT2 + 0x04, &ret);
+ ret = (ret & BIT(offset - 160));
+ break;
+ case RESET:
+ /* SW_RESET */
+ regmap_read(drvdata->csm_map, ASR_OFS, &ret);
+ ret = (ret & BIT(15));
+ break;
+ default:
+ break;
+ }
+
+ /* Return either 1 or 0 */
+ return (ret ? 1 : 0);
+}
+
+static void gxp_gpio_csm_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+ u32 tmp;
+
+ switch (offset) {
+ case 64 ... 95:
+ /* Keep ownership setting */
+ regmap_read(drvdata->csm_map, GPOOWN, &tmp);
+ tmp = (tmp & BIT(offset - 64)) ? 1 : 0;
+
+ regmap_update_bits(drvdata->csm_map, GPOOWN,
+ BIT(offset - 64), BIT(offset - 64));
+ regmap_update_bits(drvdata->csm_map, GPODAT,
+ BIT(offset - 64), value ? BIT(offset - 64) : 0);
+
+ /* Restore ownership setting */
+ regmap_update_bits(drvdata->csm_map, GPOOWN,
+ BIT(offset - 64), tmp ? BIT(offset - 64) : 0);
+ break;
+ case 96 ... 127:
+ /* Keep ownership setting */
+ regmap_read(drvdata->csm_map, GPOOWN + 0x04, &tmp);
+ tmp = (tmp & BIT(offset - 96)) ? 1 : 0;
+
+ regmap_update_bits(drvdata->csm_map, GPOOWN + 0x04,
+ BIT(offset - 96), BIT(offset - 96));
+ regmap_update_bits(drvdata->csm_map, GPODAT + 0x04,
+ BIT(offset - 96), value ? BIT(offset - 96) : 0);
+
+ /* Restore ownership setting */
+ regmap_update_bits(drvdata->csm_map, GPOOWN + 0x04,
+ BIT(offset - 96), tmp ? BIT(offset - 96) : 0);
+ break;
+ case 128 ... 159:
+ /* Keep ownership setting */
+ regmap_read(drvdata->csm_map, GPOOWN2, &tmp);
+ tmp = (tmp & BIT(offset - 128)) ? 1 : 0;
+
+ regmap_update_bits(drvdata->csm_map, GPOOWN2,
+ BIT(offset - 128), BIT(offset - 128));
+ regmap_update_bits(drvdata->csm_map, GPODAT2,
+ BIT(offset - 128), value ? BIT(offset - 128) : 0);
+
+ /* Restore ownership setting */
+ regmap_update_bits(drvdata->csm_map, GPOOWN2,
+ BIT(offset - 128), tmp ? BIT(offset - 128) : 0);
+ break;
+ case 160 ... 191:
+ /* Keep ownership setting */
+ regmap_read(drvdata->csm_map, GPOOWN2 + 0x04, &tmp);
+ tmp = (tmp & BIT(offset - 160)) ? 1 : 0;
+
+ regmap_update_bits(drvdata->csm_map, GPOOWN2 + 0x04,
+ BIT(offset - 160), BIT(offset - 160));
+ regmap_update_bits(drvdata->csm_map, GPODAT2 + 0x04,
+ BIT(offset - 160), value ? BIT(offset - 160) : 0);
+
+ /* Restore ownership setting */
+ regmap_update_bits(drvdata->csm_map, GPOOWN2 + 0x04,
+ BIT(offset - 160), tmp ? BIT(offset - 160) : 0);
+ break;
+ case 192:
+ if (value) {
+ regmap_update_bits(drvdata->csm_map, ASR_OFS,
+ BIT(0), BIT(0));
+ regmap_update_bits(drvdata->csm_map, ASR_OFS,
+ BIT(15), BIT(15));
+ } else {
+ regmap_update_bits(drvdata->csm_map, ASR_OFS,
+ BIT(15), 0);
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+static int gxp_gpio_csm_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ int ret = 0;
+
+ switch (offset) {
+ case 0 ... 63:
+ ret = GXP_GPIO_DIR_IN;
+ break;
+ case 64 ... 191:
+ ret = GXP_GPIO_DIR_OUT;
+ break;
+ case 192 ... 193:
+ ret = GXP_GPIO_DIR_OUT;
+ break;
+ case 194:
+ ret = GXP_GPIO_DIR_IN;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int gxp_gpio_csm_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ int ret = -EOPNOTSUPP;
+
+ switch (offset) {
+ case 0 ... 63:
+ ret = 0;
+ break;
+ case 194:
+ ret = 0;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int gxp_gpio_csm_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ int ret = -EOPNOTSUPP;
+
+ switch (offset) {
+ case 64 ... 191:
+ case 192 ... 193:
+ gxp_gpio_csm_set(chip, offset, value);
+ ret = 0;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int gxp_gpio_vuhc_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+ unsigned int val;
+ int ret = 0;
+
+ if (offset < 8) {
+ regmap_read(drvdata->vuhc0_map, 0x64 + 4 * offset, &val);
+ ret = (val & BIT(13)) ? 1 : 0;
+ }
+
+ return ret;
+}
+
+static void gxp_gpio_vuhc_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ switch (offset) {
+ default:
+ break;
+ }
+}
+
+static int gxp_gpio_vuhc_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ int ret = 0;
+
+ switch (offset) {
+ case 0:
+ case 1:
+ case 2:
+ ret = GXP_GPIO_DIR_IN;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int gxp_gpio_vuhc_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ int ret = -EOPNOTSUPP;
+
+ switch (offset) {
+ case 0:
+ case 1:
+ case 2:
+ ret = 0;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int gxp_gpio_vuhc_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ int ret = -EOPNOTSUPP;
+
+ switch (offset) {
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int gxp_gpio_fn2_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+ unsigned int val;
+ int ret = 0;
+
+ switch (offset) {
+ case PGOOD:
+ regmap_read(drvdata->fn2_stat, 0, &val);
+ ret = (val & BIT(24));
+
+ break;
+ case PERST:
+ regmap_read(drvdata->fn2_stat, 0, &val);
+ ret = (val & BIT(25));
+
+ break;
+ default:
+ break;
+ }
+
+ /* Return either 1 or 0 */
+ return (ret ? 1 : 0);
+}
+
+static void gxp_gpio_fn2_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+
+ switch (offset) {
+ case VPBTN:
+ writeb(1, drvdata->fn2_vbtn);
+ break;
+ default:
+ break;
+ }
+}
+
+static int gxp_gpio_fn2_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ int ret = GXP_GPIO_DIR_IN;
+
+ switch (offset) {
+ case VPBTN:
+ ret = GXP_GPIO_DIR_OUT;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int gxp_gpio_fn2_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ int ret = -EOPNOTSUPP;
+
+ switch (offset) {
+ case PGOOD:
+ case PERST:
+ case POST_COMPLETE:
+ ret = 0;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int gxp_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ int ret = 0;
+
+ if (offset < 200)
+ ret = gxp_gpio_csm_get(chip, offset);
+ else if (offset >= 250 && offset < 300)
+ ret = gxp_gpio_vuhc_get(chip, offset - 250);
+ else if (offset >= 300)
+ ret = gxp_gpio_fn2_get(chip, offset);
+
+ return ret;
+}
+
+static void gxp_gpio_set(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ if (offset < 200)
+ gxp_gpio_csm_set(chip, offset, value);
+ else if (offset >= 250 && offset < 300)
+ gxp_gpio_vuhc_set(chip, offset - 250, value);
+ else if (offset >= 300)
+ gxp_gpio_fn2_set(chip, offset, value);
+}
+
+static int gxp_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ int ret = 0;
+
+ if (offset < 200)
+ ret = gxp_gpio_csm_get_direction(chip, offset);
+ else if (offset >= 250 && offset < 300)
+ ret = gxp_gpio_vuhc_get_direction(chip, offset - 250);
+ else if (offset >= 300)
+ ret = gxp_gpio_fn2_get_direction(chip, offset);
+
+ return ret;
+}
+
+static int gxp_gpio_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ int ret = 0;
+
+ if (offset < 200)
+ ret = gxp_gpio_csm_direction_input(chip, offset);
+ else if (offset >= 250 && offset < 300)
+ ret = gxp_gpio_vuhc_direction_input(chip, offset - 250);
+ else if (offset >= 300)
+ ret = gxp_gpio_fn2_direction_input(chip, offset);
+
+ return ret;
+}
+
+static int gxp_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ int ret = 0;
+
+ if (offset < 200)
+ ret = gxp_gpio_csm_direction_output(chip, offset, value);
+ else if (offset >= 250 && offset < 300)
+ ret = gxp_gpio_vuhc_direction_output(chip, offset - 250, value);
+ return ret;
+}
+
+static struct regmap *gxp_gpio_init_regmap(struct platform_device *pdev,
+ char *reg_name, u8 bits)
+{
+ struct regmap_config regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ };
+ void __iomem *base;
+
+ if (bits == 8) {
+ regmap_config.reg_bits = 8;
+ regmap_config.reg_stride = 1;
+ regmap_config.val_bits = 8;
+ regmap_config.max_register = 0xff;
+ }
+
+ base = devm_platform_ioremap_resource_byname(pdev, reg_name);
+ if (IS_ERR(base))
+ return ERR_CAST(base);
+
+ regmap_config.name = reg_name;
+
+ return devm_regmap_init_mmio(&pdev->dev, base, &regmap_config);
+}
+
+static void gxp_gpio_fn2_irq_ack(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+ unsigned int val;
+
+ /* Read latched interrupt */
+ regmap_read(drvdata->fn2_stat, 0, &val);
+ /* Clear latched interrupt */
+ regmap_update_bits(drvdata->fn2_stat, 0,
+ 0xFFFF, 0xFFFF);
+}
+
+#define FN2_SEVMASK BIT(2)
+static void gxp_gpio_fn2_irq_set_mask(struct irq_data *d, bool set)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(chip->parent);
+
+ regmap_update_bits(drvdata->fn2_stat, FN2_SEVMASK,
+ BIT(0), set ? BIT(0) : 0);
+}
+
+static void gxp_gpio_fn2_irq_mask(struct irq_data *d)
+{
+ gxp_gpio_fn2_irq_set_mask(d, false);
+}
+
+static void gxp_gpio_fn2_irq_unmask(struct irq_data *d)
+{
+ gxp_gpio_fn2_irq_set_mask(d, true);
+}
+
+static int gxp_gpio_fn2_set_type(struct irq_data *d, unsigned int type)
+{
+ if (type & IRQ_TYPE_LEVEL_MASK)
+ irq_set_handler_locked(d, handle_level_irq);
+ else
+ irq_set_handler_locked(d, handle_edge_irq);
+
+ return 0;
+}
+
+static irqreturn_t gxp_gpio_fn2_irq_handle(int irq, void *_drvdata)
+{
+ struct gxp_gpio_drvdata *drvdata = (struct gxp_gpio_drvdata *)_drvdata;
+ unsigned int val, girq;
+
+ regmap_read(drvdata->fn2_stat, 0, &val);
+
+ if (val & PGOOD_MASK) {
+ girq = irq_find_mapping(drvdata->chip.irq.domain, PGOOD);
+ generic_handle_irq(girq);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static struct irq_chip gxp_gpio_irqchip = {
+ .name = "gxp_fn2",
+ .irq_ack = gxp_gpio_fn2_irq_ack,
+ .irq_mask = gxp_gpio_fn2_irq_mask,
+ .irq_unmask = gxp_gpio_fn2_irq_unmask,
+ .irq_set_type = gxp_gpio_fn2_set_type,
+};
+
+static struct gpio_chip common_chip = {
+ .label = "gxp_gpio",
+ .owner = THIS_MODULE,
+ .get = gxp_gpio_get,
+ .set = gxp_gpio_set,
+ .get_direction = gxp_gpio_get_direction,
+ .direction_input = gxp_gpio_direction_input,
+ .direction_output = gxp_gpio_direction_output,
+ .base = 0,
+};
+
+static int gxp_gpio_init(struct platform_device *pdev)
+{
+ struct gxp_gpio_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
+ struct gpio_irq_chip *girq;
+ int ret;
+
+ drvdata->csm_map = gxp_gpio_init_regmap(pdev, "csm", 32);
+ if (IS_ERR(drvdata->csm_map))
+ return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->csm_map),
+ "failed to map csm_handle\n");
+
+ drvdata->fn2_vbtn = devm_platform_ioremap_resource_byname(pdev, "fn2-vbtn");
+ if (IS_ERR(drvdata->fn2_vbtn))
+ return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->fn2_vbtn),
+ "failed to map fn2_vbtn\n");
+
+ drvdata->fn2_stat = gxp_gpio_init_regmap(pdev, "fn2-stat", 32);
+ if (IS_ERR(drvdata->fn2_stat))
+ return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->fn2_stat),
+ "failed to map fn2_stat\n");
+
+ drvdata->vuhc0_map = gxp_gpio_init_regmap(pdev, "vuhc", 32);
+ if (IS_ERR(drvdata->vuhc0_map))
+ return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->vuhc0_map),
+ "failed to map vuhc0_map\n");
+
+ girq = &drvdata->chip.irq;
+ girq->chip = &gxp_gpio_irqchip;
+ girq->parent_handler = NULL;
+ girq->num_parents = 0;
+ girq->parents = NULL;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_bad_irq;
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0)
+ return dev_err_probe(&pdev->dev, ret,
+ "Get irq from platform fail\n");
+
+ drvdata->irq = ret;
+
+ ret = devm_request_irq(&pdev->dev, drvdata->irq, gxp_gpio_fn2_irq_handle,
+ IRQF_SHARED, "gxp-fn2", drvdata);
+ if (ret < 0)
+ return ret;
+
+ drvdata->chip = common_chip;
+ drvdata->chip.ngpio = 220;
+
+ drvdata->chip.parent = &pdev->dev;
+ ret = devm_gpiochip_add_data(&pdev->dev, &drvdata->chip, NULL);
+ if (ret < 0)
+ return dev_err_probe(&pdev->dev, ret,
+ "Could not register gpiochip for fn2\n");
+
+ return 0;
+}
+
+static const struct of_device_id gxp_gpio_of_match[] = {
+ { .compatible = "hpe,gxp-gpio" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, gxp_gpio_of_match);
+
+static int gxp_gpio_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct gxp_gpio_drvdata *drvdata;
+
+ drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, drvdata);
+
+ ret = gxp_gpio_init(pdev);
+
+ return ret;
+}
+
+static struct platform_driver gxp_gpio_driver = {
+ .driver = {
+ .name = "gxp-gpio",
+ .of_match_table = gxp_gpio_of_match,
+ },
+ .probe = gxp_gpio_probe,
+};
+module_platform_driver(gxp_gpio_driver);
+
+MODULE_AUTHOR("Nick Hawkins <nick.hawkins@xxxxxxx>");
+MODULE_DESCRIPTION("GPIO interface for GXP");
+MODULE_LICENSE("GPL");
--
2.17.1