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1// SPDX-License-Identifier: GPL-2.02/*3 * ARM PL353 SMC driver4 *5 * Copyright (C) 2012 - 2018 Xilinx, Inc6 * Author: Punnaiah Choudary Kalluri <punnaiah@xilinx.com>7 * Author: Naga Sureshkumar Relli <nagasure@xilinx.com>8 */9 10#include <linux/clk.h>11#include <linux/kernel.h>12#include <linux/module.h>13#include <linux/of.h>14#include <linux/of_platform.h>15#include <linux/platform_device.h>16#include <linux/amba/bus.h>17 18/**19 * struct pl353_smc_data - Private smc driver structure20 * @memclk: Pointer to the peripheral clock21 * @aclk: Pointer to the AXI peripheral clock22 */23struct pl353_smc_data {24 struct clk *memclk;25 struct clk *aclk;26};27 28static int __maybe_unused pl353_smc_suspend(struct device *dev)29{30 struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);31 32 clk_disable(pl353_smc->memclk);33 clk_disable(pl353_smc->aclk);34 35 return 0;36}37 38static int __maybe_unused pl353_smc_resume(struct device *dev)39{40 struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);41 int ret;42 43 ret = clk_enable(pl353_smc->aclk);44 if (ret) {45 dev_err(dev, "Cannot enable axi domain clock.\n");46 return ret;47 }48 49 ret = clk_enable(pl353_smc->memclk);50 if (ret) {51 dev_err(dev, "Cannot enable memory clock.\n");52 clk_disable(pl353_smc->aclk);53 return ret;54 }55 56 return ret;57}58 59static SIMPLE_DEV_PM_OPS(pl353_smc_dev_pm_ops, pl353_smc_suspend,60 pl353_smc_resume);61 62static const struct of_device_id pl353_smc_supported_children[] = {63 {64 .compatible = "cfi-flash"65 },66 {67 .compatible = "arm,pl353-nand-r2p1",68 },69 {}70};71 72static int pl353_smc_probe(struct amba_device *adev, const struct amba_id *id)73{74 struct device_node *of_node = adev->dev.of_node;75 const struct of_device_id *match = NULL;76 struct pl353_smc_data *pl353_smc;77 78 pl353_smc = devm_kzalloc(&adev->dev, sizeof(*pl353_smc), GFP_KERNEL);79 if (!pl353_smc)80 return -ENOMEM;81 82 pl353_smc->aclk = devm_clk_get_enabled(&adev->dev, "apb_pclk");83 if (IS_ERR(pl353_smc->aclk))84 return dev_err_probe(&adev->dev, PTR_ERR(pl353_smc->aclk),85 "aclk clock not found.\n");86 87 pl353_smc->memclk = devm_clk_get_enabled(&adev->dev, "memclk");88 if (IS_ERR(pl353_smc->memclk))89 return dev_err_probe(&adev->dev, PTR_ERR(pl353_smc->memclk),90 "memclk clock not found.\n");91 92 amba_set_drvdata(adev, pl353_smc);93 94 /* Find compatible children. Only a single child is supported */95 for_each_available_child_of_node_scoped(of_node, child) {96 match = of_match_node(pl353_smc_supported_children, child);97 if (!match) {98 dev_warn(&adev->dev, "unsupported child node\n");99 continue;100 }101 of_platform_device_create(child, NULL, &adev->dev);102 break;103 }104 if (!match) {105 dev_err(&adev->dev, "no matching children\n");106 return -ENODEV;107 }108 109 return 0;110}111 112static const struct amba_id pl353_ids[] = {113 {114 .id = 0x00041353,115 .mask = 0x000fffff,116 },117 { 0, 0 },118};119MODULE_DEVICE_TABLE(amba, pl353_ids);120 121static struct amba_driver pl353_smc_driver = {122 .drv = {123 .name = "pl353-smc",124 .pm = &pl353_smc_dev_pm_ops,125 },126 .id_table = pl353_ids,127 .probe = pl353_smc_probe,128};129 130module_amba_driver(pl353_smc_driver);131 132MODULE_AUTHOR("Xilinx, Inc.");133MODULE_DESCRIPTION("ARM PL353 SMC Driver");134MODULE_LICENSE("GPL");135