pinctrl: add support for Qualcomm Technologies QDF2xxx ARM64 SoCs

Add the pinctrl driver for the Qualcomm Technologies QDF2xxx ARM64 SoCs,
which uses the Qualcomm Technologies TLMM pinctrl/gpio device.  This
driver is probed via ACPI and uses the pinctrl-msm.c backend driver.

This driver is intended to be used only an ACPI-enabled system.  As such,
UEFI will handle all pin control configuration, so this driver does not
provide pin control functions.  It is effectively a GPIO-only driver.

Signed-off-by: Timur Tabi <timur@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 131 insertions, 0 deletions

diff --git a/drivers/pinctrl/qcom/Kconfig b/drivers/pinctrl/qcom/Kconfig
index 8eef820b216e..383263a92e59 100644
--- a/drivers/pinctrl/qcom/Kconfig
+++ b/drivers/pinctrl/qcom/Kconfig
@@ -63,6 +63,14 @@ config PINCTRL_MSM8916
           This is the pinctrl, pinmux, pinconf and gpiolib driver for the
           Qualcomm TLMM block found on the Qualcomm 8916 platform.
 
+config PINCTRL_QDF2XXX
+        tristate "Qualcomm Technologies QDF2xxx pin controller driver"
+        depends on GPIOLIB && ACPI
+        select PINCTRL_MSM
+        help
+          This is the GPIO driver for the TLMM block found on the
+          Qualcomm Technologies QDF2xxx SOCs.
+
 config PINCTRL_QCOM_SPMI_PMIC
        tristate "Qualcomm SPMI PMIC pin controller driver"
        depends on GPIOLIB && OF && SPMI
diff --git a/drivers/pinctrl/qcom/Makefile b/drivers/pinctrl/qcom/Makefile
index e321f7ab325b..13b190e72c21 100644
--- a/drivers/pinctrl/qcom/Makefile
+++ b/drivers/pinctrl/qcom/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_PINCTRL_MSM8660)	+= pinctrl-msm8660.o
 obj-$(CONFIG_PINCTRL_MSM8960)   += pinctrl-msm8960.o
 obj-$(CONFIG_PINCTRL_MSM8X74)   += pinctrl-msm8x74.o
 obj-$(CONFIG_PINCTRL_MSM8916)   += pinctrl-msm8916.o
+obj-$(CONFIG_PINCTRL_QDF2XXX)   += pinctrl-qdf2xxx.o
 obj-$(CONFIG_PINCTRL_QCOM_SPMI_PMIC) += pinctrl-spmi-gpio.o
 obj-$(CONFIG_PINCTRL_QCOM_SPMI_PMIC) += pinctrl-spmi-mpp.o
 obj-$(CONFIG_PINCTRL_QCOM_SSBI_PMIC) += pinctrl-ssbi-gpio.o
diff --git a/drivers/pinctrl/qcom/pinctrl-qdf2xxx.c b/drivers/pinctrl/qcom/pinctrl-qdf2xxx.c
new file mode 100644
index 000000000000..e9ff3bc150bb
--- /dev/null
+++ b/drivers/pinctrl/qcom/pinctrl-qdf2xxx.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * GPIO and pin control functions on this SOC are handled by the "TLMM"
+ * device.  The driver which controls this device is pinctrl-msm.c.  Each
+ * SOC with a TLMM is expected to create a client driver that registers
+ * with pinctrl-msm.c.  This means that all TLMM drivers are pin control
+ * drivers.
+ *
+ * This pin control driver is intended to be used only an ACPI-enabled
+ * system.  As such, UEFI will handle all pin control configuration, so
+ * this driver does not provide pin control functions.  It is effectively
+ * a GPIO-only driver.  The alternative is to duplicate the GPIO code of
+ * pinctrl-msm.c into another driver.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/acpi.h>
+
+#include "pinctrl-msm.h"
+
+static struct msm_pinctrl_soc_data qdf2xxx_pinctrl;
+
+static int qdf2xxx_pinctrl_probe(struct platform_device *pdev)
+{
+        struct pinctrl_pin_desc *pins;
+        struct msm_pingroup *groups;
+        unsigned int i;
+        u32 num_gpios;
+        int ret;
+
+        /* Query the number of GPIOs from ACPI */
+        ret = device_property_read_u32(&pdev->dev, "num-gpios", &num_gpios);
+        if (ret < 0)
+                return ret;
+
+        if (!num_gpios) {
+                dev_warn(&pdev->dev, "missing num-gpios property\n");
+                return -ENODEV;
+        }
+
+        pins = devm_kcalloc(&pdev->dev, num_gpios,
+                sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
+        groups = devm_kcalloc(&pdev->dev, num_gpios,
+                sizeof(struct msm_pingroup), GFP_KERNEL);
+
+        for (i = 0; i < num_gpios; i++) {
+                pins[i].number = i;
+
+                groups[i].npins = 1,
+                groups[i].pins = &pins[i].number;
+                groups[i].ctl_reg = 0x10000 * i;
+                groups[i].io_reg = 0x04 + 0x10000 * i;
+                groups[i].intr_cfg_reg = 0x08 + 0x10000 * i;
+                groups[i].intr_status_reg = 0x0c + 0x10000 * i;
+                groups[i].intr_target_reg = 0x08 + 0x10000 * i;
+
+                groups[i].mux_bit = 2;
+                groups[i].pull_bit = 0;
+                groups[i].drv_bit = 6;
+                groups[i].oe_bit = 9;
+                groups[i].in_bit = 0;
+                groups[i].out_bit = 1;
+                groups[i].intr_enable_bit = 0;
+                groups[i].intr_status_bit = 0;
+                groups[i].intr_target_bit = 5;
+                groups[i].intr_target_kpss_val = 1;
+                groups[i].intr_raw_status_bit = 4;
+                groups[i].intr_polarity_bit = 1;
+                groups[i].intr_detection_bit = 2;
+                groups[i].intr_detection_width = 2;
+        }
+
+        qdf2xxx_pinctrl.pins = pins;
+        qdf2xxx_pinctrl.groups = groups;
+        qdf2xxx_pinctrl.npins = num_gpios;
+        qdf2xxx_pinctrl.ngroups = num_gpios;
+        qdf2xxx_pinctrl.ngpios = num_gpios;
+
+        return msm_pinctrl_probe(pdev, &qdf2xxx_pinctrl);
+}
+
+static const struct acpi_device_id qdf2xxx_acpi_ids[] = {
+        {"QCOM8001"},
+        {},
+};
+MODULE_DEVICE_TABLE(acpi, qdf2xxx_acpi_ids);
+
+static struct platform_driver qdf2xxx_pinctrl_driver = {
+        .driver = {
+                .name = "qdf2xxx-pinctrl",
+                .acpi_match_table = ACPI_PTR(qdf2xxx_acpi_ids),
+        },
+        .probe = qdf2xxx_pinctrl_probe,
+        .remove = msm_pinctrl_remove,
+};
+
+static int __init qdf2xxx_pinctrl_init(void)
+{
+        return platform_driver_register(&qdf2xxx_pinctrl_driver);
+}
+arch_initcall(qdf2xxx_pinctrl_init);
+
+static void __exit qdf2xxx_pinctrl_exit(void)
+{
+        platform_driver_unregister(&qdf2xxx_pinctrl_driver);
+}
+module_exit(qdf2xxx_pinctrl_exit);
+
+MODULE_DESCRIPTION("Qualcomm Technologies QDF2xxx pin control driver");
+MODULE_LICENSE("GPL v2");