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Subject[PATCH v1 char-misc-next 1/5] misc: microchip: pci1xxxx: load auxiliary bus driver for the PIO function in the multi-function endpoint of pci1xxxx device.
Date
pci1xxxx is a PCIe switch with a multi-function endpoint on one of its
downstream ports. PIO function is one of the functions in the
multi-function endpoint. PIO function combines a GPIO controller and also
an interface to program pci1xxxx's OTP & EEPROM. This auxiliary bus driver
is loaded for the PIO function and separate child devices are enumerated
for GPIO controller and OTP/EEPROM interface.

Signed-off-by: Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>
---
MAINTAINERS | 7 +
drivers/misc/Kconfig | 1 +
drivers/misc/Makefile | 3 +-
drivers/misc/mchp_pci1xxxx/Kconfig | 10 ++
drivers/misc/mchp_pci1xxxx/Makefile | 1 +
drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.c | 166 ++++++++++++++++++
drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.h | 28 +++
7 files changed, 215 insertions(+), 1 deletion(-)
create mode 100644 drivers/misc/mchp_pci1xxxx/Kconfig
create mode 100644 drivers/misc/mchp_pci1xxxx/Makefile
create mode 100644 drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.c
create mode 100644 drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 285ffe0df5cf..9d20c9af0d5c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13244,6 +13244,13 @@ S: Supported
F: Documentation/devicetree/bindings/mtd/atmel-nand.txt
F: drivers/mtd/nand/raw/atmel/*

+MICROCHIP PCI1XXXX GP DRIVER
+M: Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>
+L: linux-gpio@vger.kernel.org
+S: Supported
+F: drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.c
+F: drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.h
+
MICROCHIP OTPC DRIVER
M: Claudiu Beznea <claudiu.beznea@microchip.com>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 94e9fb4cdd76..358ad56f6524 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -513,4 +513,5 @@ source "drivers/misc/cardreader/Kconfig"
source "drivers/misc/habanalabs/Kconfig"
source "drivers/misc/uacce/Kconfig"
source "drivers/misc/pvpanic/Kconfig"
+source "drivers/misc/mchp_pci1xxxx/Kconfig"
endmenu
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 2be8542616dd..ac9b3e757ba1 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -60,4 +60,5 @@ obj-$(CONFIG_XILINX_SDFEC) += xilinx_sdfec.o
obj-$(CONFIG_HISI_HIKEY_USB) += hisi_hikey_usb.o
obj-$(CONFIG_HI6421V600_IRQ) += hi6421v600-irq.o
obj-$(CONFIG_OPEN_DICE) += open-dice.o
-obj-$(CONFIG_VCPU_STALL_DETECTOR) += vcpu_stall_detector.o
\ No newline at end of file
+obj-$(CONFIG_GP_PCI1XXXX) += mchp_pci1xxxx/
+obj-$(CONFIG_VCPU_STALL_DETECTOR) += vcpu_stall_detector.o
diff --git a/drivers/misc/mchp_pci1xxxx/Kconfig b/drivers/misc/mchp_pci1xxxx/Kconfig
new file mode 100644
index 000000000000..387a88addfb0
--- /dev/null
+++ b/drivers/misc/mchp_pci1xxxx/Kconfig
@@ -0,0 +1,10 @@
+config GP_PCI1XXXX
+ tristate "Microchip PCI1XXXX PCIe to GPIO Expander + OTP/EEPROM manager"
+ select GPIOLIB_IRQCHIP
+ help
+ PCI1XXXX is a PCIe GEN 3 switch with one of the endpoints having
+ multiple functions and one of the functions is a GPIO controller
+ which also has registers to interface with the OTP and EEPROM.
+ Select yes, no or module here to include or exclude the driver
+ for the GPIO function.
+
diff --git a/drivers/misc/mchp_pci1xxxx/Makefile b/drivers/misc/mchp_pci1xxxx/Makefile
new file mode 100644
index 000000000000..23927ab251c4
--- /dev/null
+++ b/drivers/misc/mchp_pci1xxxx/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_GP_PCI1XXXX) := mchp_pci1xxxx_gp.o
diff --git a/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.c b/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.c
new file mode 100644
index 000000000000..bfc03028b34d
--- /dev/null
+++ b/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2022 Microchip Technology Inc.
+
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/spinlock.h>
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/idr.h>
+#include "mchp_pci1xxxx_gp.h"
+
+struct aux_bus_device {
+ struct auxiliary_device_wrapper *aux_device_wrapper[2];
+};
+
+static DEFINE_IDA(gp_client_ida);
+static const char aux_dev_otp_e2p_name[15] = "gp_otp_e2p";
+static const char aux_dev_gpio_name[15] = "gp_gpio";
+
+static void gp_auxiliary_device_release(struct device *dev)
+{
+ struct auxiliary_device_wrapper *aux_device_wrapper =
+ (struct auxiliary_device_wrapper *)container_of(dev,
+ struct auxiliary_device_wrapper, aux_dev.dev);
+
+ ida_free(&gp_client_ida, aux_device_wrapper->aux_dev.id);
+ kfree(aux_device_wrapper);
+}
+
+static int gp_aux_bus_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct aux_bus_device *aux_bus;
+ int retval;
+
+ retval = pcim_enable_device(pdev);
+ if (retval)
+ return retval;
+
+ aux_bus = kzalloc(sizeof(*aux_bus), GFP_KERNEL);
+ if (!aux_bus)
+ return -ENOMEM;
+
+ aux_bus->aux_device_wrapper[0] = kzalloc(sizeof(*aux_bus->aux_device_wrapper[0]),
+ GFP_KERNEL);
+ if (!aux_bus->aux_device_wrapper[0])
+ return -ENOMEM;
+
+ retval = ida_alloc(&gp_client_ida, GFP_KERNEL);
+ if (retval < 0)
+ goto err_ida_alloc_0;
+
+ aux_bus->aux_device_wrapper[0]->aux_dev.name = aux_dev_otp_e2p_name;
+ aux_bus->aux_device_wrapper[0]->aux_dev.dev.parent = &pdev->dev;
+ aux_bus->aux_device_wrapper[0]->aux_dev.dev.release = gp_auxiliary_device_release;
+ aux_bus->aux_device_wrapper[0]->aux_dev.id = retval;
+
+ aux_bus->aux_device_wrapper[0]->gp_aux_data.region_start = pci_resource_start(pdev, 0);
+ aux_bus->aux_device_wrapper[0]->gp_aux_data.region_length = pci_resource_end(pdev, 0);
+
+ retval = auxiliary_device_init(&aux_bus->aux_device_wrapper[0]->aux_dev);
+ if (retval < 0)
+ goto err_aux_dev_init_0;
+
+ retval = auxiliary_device_add(&aux_bus->aux_device_wrapper[0]->aux_dev);
+ if (retval)
+ goto err_aux_dev_add_0;
+
+ aux_bus->aux_device_wrapper[1] = kzalloc(sizeof(*aux_bus->aux_device_wrapper[1]),
+ GFP_KERNEL);
+ if (!aux_bus->aux_device_wrapper[1])
+ return -ENOMEM;
+
+ retval = ida_alloc(&gp_client_ida, GFP_KERNEL);
+ if (retval < 0)
+ goto err_ida_alloc_1;
+
+ aux_bus->aux_device_wrapper[1]->aux_dev.name = aux_dev_gpio_name;
+ aux_bus->aux_device_wrapper[1]->aux_dev.dev.parent = &pdev->dev;
+ aux_bus->aux_device_wrapper[1]->aux_dev.dev.release = gp_auxiliary_device_release;
+ aux_bus->aux_device_wrapper[1]->aux_dev.id = retval;
+
+ aux_bus->aux_device_wrapper[1]->gp_aux_data.region_start = pci_resource_start(pdev, 0);
+ aux_bus->aux_device_wrapper[1]->gp_aux_data.region_length = pci_resource_end(pdev, 0);
+
+ retval = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
+
+ if (retval < 0)
+ return retval;
+
+ pdev->irq = pci_irq_vector(pdev, 0);
+ if (pdev->irq < 0)
+ return retval;
+
+ aux_bus->aux_device_wrapper[1]->gp_aux_data.irq_num = pdev->irq;
+
+ retval = auxiliary_device_init(&aux_bus->aux_device_wrapper[1]->aux_dev);
+ if (retval < 0)
+ goto err_aux_dev_init_1;
+
+ retval = auxiliary_device_add(&aux_bus->aux_device_wrapper[1]->aux_dev);
+ if (retval)
+ goto err_aux_dev_add_1;
+
+ pci_set_drvdata(pdev, aux_bus);
+ pci_set_master(pdev);
+
+ return 0;
+
+err_aux_dev_add_1:
+ auxiliary_device_uninit(&aux_bus->aux_device_wrapper[1]->aux_dev);
+
+err_aux_dev_init_1:
+ ida_free(&gp_client_ida, aux_bus->aux_device_wrapper[1]->aux_dev.id);
+
+err_ida_alloc_1:
+ kfree(aux_bus->aux_device_wrapper[1]);
+
+err_aux_dev_add_0:
+ auxiliary_device_uninit(&aux_bus->aux_device_wrapper[0]->aux_dev);
+
+err_aux_dev_init_0:
+ ida_free(&gp_client_ida, aux_bus->aux_device_wrapper[0]->aux_dev.id);
+
+err_ida_alloc_0:
+ kfree(aux_bus->aux_device_wrapper[0]);
+
+ return retval;
+}
+
+static void gp_aux_bus_remove(struct pci_dev *pdev)
+{
+ struct aux_bus_device *aux_bus = pci_get_drvdata(pdev);
+
+ auxiliary_device_delete(&aux_bus->aux_device_wrapper[0]->aux_dev);
+ auxiliary_device_uninit(&aux_bus->aux_device_wrapper[0]->aux_dev);
+ auxiliary_device_delete(&aux_bus->aux_device_wrapper[1]->aux_dev);
+ auxiliary_device_uninit(&aux_bus->aux_device_wrapper[1]->aux_dev);
+ kfree(aux_bus);
+ pci_disable_device(pdev);
+}
+
+static const struct pci_device_id pci1xxxx_tbl[] = {
+ { PCI_DEVICE(0x1055, 0xA005) },
+ { PCI_DEVICE(0x1055, 0xA015) },
+ { PCI_DEVICE(0x1055, 0xA025) },
+ { PCI_DEVICE(0x1055, 0xA035) },
+ { PCI_DEVICE(0x1055, 0xA045) },
+ { PCI_DEVICE(0x1055, 0xA055) },
+ {0,}
+};
+MODULE_DEVICE_TABLE(pci, pci1xxxx_tbl);
+
+static struct pci_driver pci1xxxx_gp_driver = {
+ .name = "PCI1xxxxGP",
+ .id_table = pci1xxxx_tbl,
+ .probe = gp_aux_bus_probe,
+ .remove = gp_aux_bus_remove,
+};
+
+module_pci_driver(pci1xxxx_gp_driver);
+
+MODULE_DESCRIPTION("Microchip Technology Inc. PCI1xxxx GP expander");
+MODULE_AUTHOR("Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.h b/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.h
new file mode 100644
index 000000000000..37eec73b20d7
--- /dev/null
+++ b/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2022 Microchip Technology Inc. */
+
+#ifndef _GPIO_PCI1XXXX_H
+#define _GPIO_PCI1XXXX_H
+
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/kthread.h>
+#include <linux/types.h>
+#include <linux/auxiliary_bus.h>
+
+/* Perform operations like variable length write, read and write with read back for OTP / EEPROM
+ * Perform bit mode write in OTP
+ */
+
+struct gp_aux_data_type {
+ int irq_num;
+ resource_size_t region_start;
+ resource_size_t region_length;
+};
+
+struct auxiliary_device_wrapper {
+ struct auxiliary_device aux_dev;
+ struct gp_aux_data_type gp_aux_data;
+};
+
+#endif
--
2.25.1
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