drivers/pinctrl/freescale/pinctrl-scu.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2016 Freescale Semiconductor, Inc.
   4  * Copyright 2017-2018 NXP
   5  *      Dong Aisheng <aisheng.dong@nxp.com>
   6  */
   7
   8 #include <linux/err.h>
   9 #include <linux/firmware/imx/sci.h>
  10 #include <linux/module.h>
  11 #include <linux/of_address.h>
  12 #include <linux/pinctrl/pinctrl.h>
  13 #include <linux/platform_device.h>
  14
  15 #include "../core.h"
  16 #include "pinctrl-imx.h"
  17
  18 enum pad_func_e {
  19         IMX_SC_PAD_FUNC_SET = 15,
  20         IMX_SC_PAD_FUNC_GET = 16,
  21 };
  22
  23 struct imx_sc_msg_req_pad_set {
  24         struct imx_sc_rpc_msg hdr;
  25         u32 val;
  26         u16 pad;
  27 } __packed __aligned(4);
  28
  29 struct imx_sc_msg_req_pad_get {
  30         struct imx_sc_rpc_msg hdr;
  31         u16 pad;
  32 } __packed __aligned(4);
  33
  34 struct imx_sc_msg_resp_pad_get {
  35         struct imx_sc_rpc_msg hdr;
  36         u32 val;
  37 } __packed;
  38
  39 static struct imx_sc_ipc *pinctrl_ipc_handle;
  40
  41 int imx_pinctrl_sc_ipc_init(struct platform_device *pdev)
  42 {
  43         return imx_scu_get_handle(&pinctrl_ipc_handle);
  44 }
  45 EXPORT_SYMBOL_GPL(imx_pinctrl_sc_ipc_init);
  46
  47 int imx_pinconf_get_scu(struct pinctrl_dev *pctldev, unsigned pin_id,
  48                         unsigned long *config)
  49 {
  50         struct imx_sc_msg_req_pad_get msg;
  51         struct imx_sc_msg_resp_pad_get *resp;
  52         struct imx_sc_rpc_msg *hdr = &msg.hdr;
  53         int ret;
  54
  55         hdr->ver = IMX_SC_RPC_VERSION;
  56         hdr->svc = IMX_SC_RPC_SVC_PAD;
  57         hdr->func = IMX_SC_PAD_FUNC_GET;
  58         hdr->size = 2;
  59
  60         msg.pad = pin_id;
  61
  62         ret = imx_scu_call_rpc(pinctrl_ipc_handle, &msg, true);
  63         if (ret)
  64                 return ret;
  65
  66         resp = (struct imx_sc_msg_resp_pad_get *)&msg;
  67         *config = resp->val;
  68
  69         return 0;
  70 }
  71 EXPORT_SYMBOL_GPL(imx_pinconf_get_scu);
  72
  73 int imx_pinconf_set_scu(struct pinctrl_dev *pctldev, unsigned pin_id,
  74                         unsigned long *configs, unsigned num_configs)
  75 {
  76         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
  77         struct imx_sc_msg_req_pad_set msg;
  78         struct imx_sc_rpc_msg *hdr = &msg.hdr;
  79         unsigned int mux = configs[0];
  80         unsigned int conf = configs[1];
  81         unsigned int val;
  82         int ret;
  83
  84         /*
  85          * Set mux and conf together in one IPC call
  86          */
  87         WARN_ON(num_configs != 2);
  88
  89         val = conf | BM_PAD_CTL_IFMUX_ENABLE | BM_PAD_CTL_GP_ENABLE;
  90         val |= mux << BP_PAD_CTL_IFMUX;
  91
  92         hdr->ver = IMX_SC_RPC_VERSION;
  93         hdr->svc = IMX_SC_RPC_SVC_PAD;
  94         hdr->func = IMX_SC_PAD_FUNC_SET;
  95         hdr->size = 3;
  96
  97         msg.pad = pin_id;
  98         msg.val = val;
  99
 100         ret = imx_scu_call_rpc(pinctrl_ipc_handle, &msg, true);
 101
 102         dev_dbg(ipctl->dev, "write: pin_id %u config 0x%x val 0x%x\n",
 103                 pin_id, conf, val);
 104
 105         return ret;
 106 }
 107 EXPORT_SYMBOL_GPL(imx_pinconf_set_scu);
 108
 109 void imx_pinctrl_parse_pin_scu(struct imx_pinctrl *ipctl,
 110                                unsigned int *pin_id, struct imx_pin *pin,
 111                                const __be32 **list_p)
 112 {
 113         const struct imx_pinctrl_soc_info *info = ipctl->info;
 114         struct imx_pin_scu *pin_scu = &pin->conf.scu;
 115         const __be32 *list = *list_p;
 116
 117         pin->pin = be32_to_cpu(*list++);
 118         *pin_id = pin->pin;
 119         pin_scu->mux_mode = be32_to_cpu(*list++);
 120         pin_scu->config = be32_to_cpu(*list++);
 121         *list_p = list;
 122
 123         dev_dbg(ipctl->dev, "%s: 0x%x 0x%08lx", info->pins[pin->pin].name,
 124                 pin_scu->mux_mode, pin_scu->config);
 125 }
 126 EXPORT_SYMBOL_GPL(imx_pinctrl_parse_pin_scu);
 127
 128 MODULE_AUTHOR("Dong Aisheng <aisheng.dong@nxp.com>");
 129 MODULE_DESCRIPTION("NXP i.MX SCU common pinctrl driver");
 130 MODULE_LICENSE("GPL v2");