123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169 |
- // SPDX-License-Identifier: GPL-2.0
- /*
- * ARM PL353 SMC driver
- *
- * Copyright (C) 2012 - 2018 Xilinx, Inc
- * Author: Punnaiah Choudary Kalluri <[email protected]>
- * Author: Naga Sureshkumar Relli <[email protected]>
- */
- #include <linux/clk.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/of_platform.h>
- #include <linux/platform_device.h>
- #include <linux/amba/bus.h>
- /**
- * struct pl353_smc_data - Private smc driver structure
- * @memclk: Pointer to the peripheral clock
- * @aclk: Pointer to the AXI peripheral clock
- */
- struct pl353_smc_data {
- struct clk *memclk;
- struct clk *aclk;
- };
- static int __maybe_unused pl353_smc_suspend(struct device *dev)
- {
- struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
- clk_disable(pl353_smc->memclk);
- clk_disable(pl353_smc->aclk);
- return 0;
- }
- static int __maybe_unused pl353_smc_resume(struct device *dev)
- {
- struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
- int ret;
- ret = clk_enable(pl353_smc->aclk);
- if (ret) {
- dev_err(dev, "Cannot enable axi domain clock.\n");
- return ret;
- }
- ret = clk_enable(pl353_smc->memclk);
- if (ret) {
- dev_err(dev, "Cannot enable memory clock.\n");
- clk_disable(pl353_smc->aclk);
- return ret;
- }
- return ret;
- }
- static SIMPLE_DEV_PM_OPS(pl353_smc_dev_pm_ops, pl353_smc_suspend,
- pl353_smc_resume);
- static const struct of_device_id pl353_smc_supported_children[] = {
- {
- .compatible = "cfi-flash"
- },
- {
- .compatible = "arm,pl353-nand-r2p1",
- },
- {}
- };
- static int pl353_smc_probe(struct amba_device *adev, const struct amba_id *id)
- {
- struct device_node *of_node = adev->dev.of_node;
- const struct of_device_id *match = NULL;
- struct pl353_smc_data *pl353_smc;
- struct device_node *child;
- int err;
- pl353_smc = devm_kzalloc(&adev->dev, sizeof(*pl353_smc), GFP_KERNEL);
- if (!pl353_smc)
- return -ENOMEM;
- pl353_smc->aclk = devm_clk_get(&adev->dev, "apb_pclk");
- if (IS_ERR(pl353_smc->aclk)) {
- dev_err(&adev->dev, "aclk clock not found.\n");
- return PTR_ERR(pl353_smc->aclk);
- }
- pl353_smc->memclk = devm_clk_get(&adev->dev, "memclk");
- if (IS_ERR(pl353_smc->memclk)) {
- dev_err(&adev->dev, "memclk clock not found.\n");
- return PTR_ERR(pl353_smc->memclk);
- }
- err = clk_prepare_enable(pl353_smc->aclk);
- if (err) {
- dev_err(&adev->dev, "Unable to enable AXI clock.\n");
- return err;
- }
- err = clk_prepare_enable(pl353_smc->memclk);
- if (err) {
- dev_err(&adev->dev, "Unable to enable memory clock.\n");
- goto disable_axi_clk;
- }
- amba_set_drvdata(adev, pl353_smc);
- /* Find compatible children. Only a single child is supported */
- for_each_available_child_of_node(of_node, child) {
- match = of_match_node(pl353_smc_supported_children, child);
- if (!match) {
- dev_warn(&adev->dev, "unsupported child node\n");
- continue;
- }
- break;
- }
- if (!match) {
- err = -ENODEV;
- dev_err(&adev->dev, "no matching children\n");
- goto disable_mem_clk;
- }
- of_platform_device_create(child, NULL, &adev->dev);
- of_node_put(child);
- return 0;
- disable_mem_clk:
- clk_disable_unprepare(pl353_smc->memclk);
- disable_axi_clk:
- clk_disable_unprepare(pl353_smc->aclk);
- return err;
- }
- static void pl353_smc_remove(struct amba_device *adev)
- {
- struct pl353_smc_data *pl353_smc = amba_get_drvdata(adev);
- clk_disable_unprepare(pl353_smc->memclk);
- clk_disable_unprepare(pl353_smc->aclk);
- }
- static const struct amba_id pl353_ids[] = {
- {
- .id = 0x00041353,
- .mask = 0x000fffff,
- },
- { 0, 0 },
- };
- MODULE_DEVICE_TABLE(amba, pl353_ids);
- static struct amba_driver pl353_smc_driver = {
- .drv = {
- .owner = THIS_MODULE,
- .name = "pl353-smc",
- .pm = &pl353_smc_dev_pm_ops,
- },
- .id_table = pl353_ids,
- .probe = pl353_smc_probe,
- .remove = pl353_smc_remove,
- };
- module_amba_driver(pl353_smc_driver);
- MODULE_AUTHOR("Xilinx, Inc.");
- MODULE_DESCRIPTION("ARM PL353 SMC Driver");
- MODULE_LICENSE("GPL");
|