drivers/hid/amd-sfh-hid/amd_sfh_pcie.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * AMD MP2 PCIe communication driver
   4  * Copyright 2020 Advanced Micro Devices, Inc.
   5  *
   6  * Authors: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
   7  *          Sandeep Singh <Sandeep.singh@amd.com>
   8  */
   9
  10 #include <linux/bitops.h>
  11 #include <linux/delay.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/io-64-nonatomic-lo-hi.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17
  18 #include "amd_sfh_pcie.h"
  19
  20 #define DRIVER_NAME     "pcie_mp2_amd"
  21 #define DRIVER_DESC     "AMD(R) PCIe MP2 Communication Driver"
  22
  23 #define ACEL_EN         BIT(0)
  24 #define GYRO_EN         BIT(1)
  25 #define MAGNO_EN                BIT(2)
  26 #define ALS_EN          BIT(19)
  27
  28 void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info)
  29 {
  30         union sfh_cmd_param cmd_param;
  31         union sfh_cmd_base cmd_base;
  32
  33         /* fill up command register */
  34         memset(&cmd_base, 0, sizeof(cmd_base));
  35         cmd_base.s.cmd_id = ENABLE_SENSOR;
  36         cmd_base.s.period = info.period;
  37         cmd_base.s.sensor_id = info.sensor_idx;
  38
  39         /* fill up command param register */
  40         memset(&cmd_param, 0, sizeof(cmd_param));
  41         cmd_param.s.buf_layout = 1;
  42         cmd_param.s.buf_length = 16;
  43
  44         writeq(info.dma_address, privdata->mmio + AMD_C2P_MSG2);
  45         writel(cmd_param.ul, privdata->mmio + AMD_C2P_MSG1);
  46         writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
  47 }
  48
  49 void amd_stop_sensor(struct amd_mp2_dev *privdata, u16 sensor_idx)
  50 {
  51         union sfh_cmd_base cmd_base;
  52
  53         /* fill up command register */
  54         memset(&cmd_base, 0, sizeof(cmd_base));
  55         cmd_base.s.cmd_id = DISABLE_SENSOR;
  56         cmd_base.s.period = 0;
  57         cmd_base.s.sensor_id = sensor_idx;
  58
  59         writeq(0x0, privdata->mmio + AMD_C2P_MSG2);
  60         writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
  61 }
  62
  63 void amd_stop_all_sensors(struct amd_mp2_dev *privdata)
  64 {
  65         union sfh_cmd_base cmd_base;
  66
  67         /* fill up command register */
  68         memset(&cmd_base, 0, sizeof(cmd_base));
  69         cmd_base.s.cmd_id = STOP_ALL_SENSORS;
  70         cmd_base.s.period = 0;
  71         cmd_base.s.sensor_id = 0;
  72
  73         writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
  74 }
  75
  76 int amd_mp2_get_sensor_num(struct amd_mp2_dev *privdata, u8 *sensor_id)
  77 {
  78         int activestatus, num_of_sensors = 0;
  79
  80         privdata->activecontrolstatus = readl(privdata->mmio + AMD_P2C_MSG3);
  81         activestatus = privdata->activecontrolstatus >> 4;
  82         if (ACEL_EN  & activestatus)
  83                 sensor_id[num_of_sensors++] = accel_idx;
  84
  85         if (GYRO_EN & activestatus)
  86                 sensor_id[num_of_sensors++] = gyro_idx;
  87
  88         if (MAGNO_EN & activestatus)
  89                 sensor_id[num_of_sensors++] = mag_idx;
  90
  91         if (ALS_EN & activestatus)
  92                 sensor_id[num_of_sensors++] = als_idx;
  93
  94         return num_of_sensors;
  95 }
  96
  97 static void amd_mp2_pci_remove(void *privdata)
  98 {
  99         amd_sfh_hid_client_deinit(privdata);
 100         amd_stop_all_sensors(privdata);
 101 }
 102
 103 static int amd_mp2_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 104 {
 105         struct amd_mp2_dev *privdata;
 106         int rc;
 107
 108         privdata = devm_kzalloc(&pdev->dev, sizeof(*privdata), GFP_KERNEL);
 109         if (!privdata)
 110                 return -ENOMEM;
 111
 112         privdata->pdev = pdev;
 113         pci_set_drvdata(pdev, privdata);
 114         rc = pcim_enable_device(pdev);
 115         if (rc)
 116                 return rc;
 117
 118         rc = pcim_iomap_regions(pdev, BIT(2), DRIVER_NAME);
 119         if (rc)
 120                 return rc;
 121
 122         privdata->mmio = pcim_iomap_table(pdev)[2];
 123         pci_set_master(pdev);
 124         rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 125         if (rc) {
 126                 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 127                 return rc;
 128         }
 129         rc = devm_add_action_or_reset(&pdev->dev, amd_mp2_pci_remove, privdata);
 130         if (rc)
 131                 return rc;
 132
 133         return amd_sfh_hid_client_init(privdata);
 134 }
 135
 136 static const struct pci_device_id amd_mp2_pci_tbl[] = {
 137         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_MP2) },
 138         { }
 139 };
 140 MODULE_DEVICE_TABLE(pci, amd_mp2_pci_tbl);
 141
 142 static struct pci_driver amd_mp2_pci_driver = {
 143         .name           = DRIVER_NAME,
 144         .id_table       = amd_mp2_pci_tbl,
 145         .probe          = amd_mp2_pci_probe,
 146 };
 147 module_pci_driver(amd_mp2_pci_driver);
 148
 149 MODULE_DESCRIPTION(DRIVER_DESC);
 150 MODULE_LICENSE("Dual BSD/GPL");
 151 MODULE_AUTHOR("Shyam Sundar S K <Shyam-sundar.S-k@amd.com>");
 152 MODULE_AUTHOR("Sandeep Singh <Sandeep.singh@amd.com>");