drivers/pinctrl/qcom/pinctrl-qdf2xxx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
   4  *
   5  * GPIO and pin control functions on this SOC are handled by the "TLMM"
   6  * device.  The driver which controls this device is pinctrl-msm.c.  Each
   7  * SOC with a TLMM is expected to create a client driver that registers
   8  * with pinctrl-msm.c.  This means that all TLMM drivers are pin control
   9  * drivers.
  10  *
  11  * This pin control driver is intended to be used only an ACPI-enabled
  12  * system.  As such, UEFI will handle all pin control configuration, so
  13  * this driver does not provide pin control functions.  It is effectively
  14  * a GPIO-only driver.  The alternative is to duplicate the GPIO code of
  15  * pinctrl-msm.c into another driver.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/pinctrl/pinctrl.h>
  21 #include <linux/acpi.h>
  22
  23 #include "pinctrl-msm.h"
  24
  25 /* A maximum of 256 allows us to use a u8 array to hold the GPIO numbers */
  26 #define MAX_GPIOS       256
  27
  28 /* maximum size of each gpio name (enough room for "gpioXXX" + null) */
  29 #define NAME_SIZE       8
  30
  31 static int qdf2xxx_pinctrl_probe(struct platform_device *pdev)
  32 {
  33         struct msm_pinctrl_soc_data *pinctrl;
  34         struct pinctrl_pin_desc *pins;
  35         struct msm_pingroup *groups;
  36         char (*names)[NAME_SIZE];
  37         unsigned int i;
  38         u32 num_gpios;
  39         unsigned int avail_gpios; /* The number of GPIOs we support */
  40         u8 gpios[MAX_GPIOS];      /* An array of supported GPIOs */
  41         int ret;
  42
  43         /* Query the number of GPIOs from ACPI */
  44         ret = device_property_read_u32(&pdev->dev, "num-gpios", &num_gpios);
  45         if (ret < 0) {
  46                 dev_err(&pdev->dev, "missing 'num-gpios' property\n");
  47                 return ret;
  48         }
  49         if (!num_gpios || num_gpios > MAX_GPIOS) {
  50                 dev_err(&pdev->dev, "invalid 'num-gpios' property\n");
  51                 return -ENODEV;
  52         }
  53
  54         /* The number of GPIOs in the approved list */
  55         ret = device_property_count_u8(&pdev->dev, "gpios");
  56         if (ret < 0) {
  57                 dev_err(&pdev->dev, "missing 'gpios' property\n");
  58                 return ret;
  59         }
  60         /*
  61          * The number of available GPIOs should be non-zero, and no
  62          * more than the total number of GPIOS.
  63          */
  64         if (!ret || ret > num_gpios) {
  65                 dev_err(&pdev->dev, "invalid 'gpios' property\n");
  66                 return -ENODEV;
  67         }
  68         avail_gpios = ret;
  69
  70         ret = device_property_read_u8_array(&pdev->dev, "gpios", gpios,
  71                                             avail_gpios);
  72         if (ret < 0) {
  73                 dev_err(&pdev->dev, "could not read list of GPIOs\n");
  74                 return ret;
  75         }
  76
  77         pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
  78         pins = devm_kcalloc(&pdev->dev, num_gpios,
  79                 sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
  80         groups = devm_kcalloc(&pdev->dev, num_gpios,
  81                 sizeof(struct msm_pingroup), GFP_KERNEL);
  82         names = devm_kcalloc(&pdev->dev, avail_gpios, NAME_SIZE, GFP_KERNEL);
  83
  84         if (!pinctrl || !pins || !groups || !names)
  85                 return -ENOMEM;
  86
  87         /*
  88          * Initialize the array.  GPIOs not listed in the 'gpios' array
  89          * still need a number, but nothing else.
  90          */
  91         for (i = 0; i < num_gpios; i++) {
  92                 pins[i].number = i;
  93                 groups[i].pins = &pins[i].number;
  94         }
  95
  96         /* Populate the entries that are meant to be exposed as GPIOs. */
  97         for (i = 0; i < avail_gpios; i++) {
  98                 unsigned int gpio = gpios[i];
  99
 100                 groups[gpio].npins = 1;
 101                 snprintf(names[i], NAME_SIZE, "gpio%u", gpio);
 102                 pins[gpio].name = names[i];
 103                 groups[gpio].name = names[i];
 104
 105                 groups[gpio].ctl_reg = 0x10000 * gpio;
 106                 groups[gpio].io_reg = 0x04 + 0x10000 * gpio;
 107                 groups[gpio].intr_cfg_reg = 0x08 + 0x10000 * gpio;
 108                 groups[gpio].intr_status_reg = 0x0c + 0x10000 * gpio;
 109                 groups[gpio].intr_target_reg = 0x08 + 0x10000 * gpio;
 110
 111                 groups[gpio].mux_bit = 2;
 112                 groups[gpio].pull_bit = 0;
 113                 groups[gpio].drv_bit = 6;
 114                 groups[gpio].oe_bit = 9;
 115                 groups[gpio].in_bit = 0;
 116                 groups[gpio].out_bit = 1;
 117                 groups[gpio].intr_enable_bit = 0;
 118                 groups[gpio].intr_status_bit = 0;
 119                 groups[gpio].intr_target_bit = 5;
 120                 groups[gpio].intr_target_kpss_val = 1;
 121                 groups[gpio].intr_raw_status_bit = 4;
 122                 groups[gpio].intr_polarity_bit = 1;
 123                 groups[gpio].intr_detection_bit = 2;
 124                 groups[gpio].intr_detection_width = 2;
 125         }
 126
 127         pinctrl->pins = pins;
 128         pinctrl->groups = groups;
 129         pinctrl->npins = num_gpios;
 130         pinctrl->ngroups = num_gpios;
 131         pinctrl->ngpios = num_gpios;
 132
 133         return msm_pinctrl_probe(pdev, pinctrl);
 134 }
 135
 136 static const struct acpi_device_id qdf2xxx_acpi_ids[] = {
 137         {"QCOM8002"},
 138         {},
 139 };
 140 MODULE_DEVICE_TABLE(acpi, qdf2xxx_acpi_ids);
 141
 142 static struct platform_driver qdf2xxx_pinctrl_driver = {
 143         .driver = {
 144                 .name = "qdf2xxx-pinctrl",
 145                 .acpi_match_table = ACPI_PTR(qdf2xxx_acpi_ids),
 146         },
 147         .probe = qdf2xxx_pinctrl_probe,
 148         .remove = msm_pinctrl_remove,
 149 };
 150
 151 static int __init qdf2xxx_pinctrl_init(void)
 152 {
 153         return platform_driver_register(&qdf2xxx_pinctrl_driver);
 154 }
 155 arch_initcall(qdf2xxx_pinctrl_init);
 156
 157 static void __exit qdf2xxx_pinctrl_exit(void)
 158 {
 159         platform_driver_unregister(&qdf2xxx_pinctrl_driver);
 160 }
 161 module_exit(qdf2xxx_pinctrl_exit);
 162
 163 MODULE_DESCRIPTION("Qualcomm Technologies QDF2xxx pin control driver");
 164 MODULE_LICENSE("GPL v2");