diff options
Diffstat (limited to 'drivers/mailbox/qcom-apcs-ipc-mailbox.c')
| -rw-r--r-- | drivers/mailbox/qcom-apcs-ipc-mailbox.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/drivers/mailbox/qcom-apcs-ipc-mailbox.c b/drivers/mailbox/qcom-apcs-ipc-mailbox.c new file mode 100644 index 000000000..3d100a004 --- /dev/null +++ b/drivers/mailbox/qcom-apcs-ipc-mailbox.c @@ -0,0 +1,191 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2017, Linaro Ltd + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/mailbox_controller.h> + +#define QCOM_APCS_IPC_BITS 32 + +struct qcom_apcs_ipc { + struct mbox_controller mbox; + struct mbox_chan mbox_chans[QCOM_APCS_IPC_BITS]; + + struct regmap *regmap; + unsigned long offset; + struct platform_device *clk; +}; + +struct qcom_apcs_ipc_data { + int offset; + char *clk_name; +}; + +static const struct qcom_apcs_ipc_data ipq6018_apcs_data = { + .offset = 8, .clk_name = "qcom,apss-ipq6018-clk" +}; + +static const struct qcom_apcs_ipc_data ipq8074_apcs_data = { + .offset = 8, .clk_name = NULL +}; + +static const struct qcom_apcs_ipc_data msm8916_apcs_data = { + .offset = 8, .clk_name = "qcom-apcs-msm8916-clk" +}; + +static const struct qcom_apcs_ipc_data msm8994_apcs_data = { + .offset = 8, .clk_name = NULL +}; + +static const struct qcom_apcs_ipc_data msm8996_apcs_data = { + .offset = 16, .clk_name = NULL +}; + +static const struct qcom_apcs_ipc_data msm8998_apcs_data = { + .offset = 8, .clk_name = NULL +}; + +static const struct qcom_apcs_ipc_data sdm660_apcs_data = { + .offset = 8, .clk_name = NULL +}; + +static const struct qcom_apcs_ipc_data apps_shared_apcs_data = { + .offset = 12, .clk_name = NULL +}; + +static const struct regmap_config apcs_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = 0xFFC, + .fast_io = true, +}; + +static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data) +{ + struct qcom_apcs_ipc *apcs = container_of(chan->mbox, + struct qcom_apcs_ipc, mbox); + unsigned long idx = (unsigned long)chan->con_priv; + + return regmap_write(apcs->regmap, apcs->offset, BIT(idx)); +} + +static const struct mbox_chan_ops qcom_apcs_ipc_ops = { + .send_data = qcom_apcs_ipc_send_data, +}; + +static int qcom_apcs_ipc_probe(struct platform_device *pdev) +{ + struct qcom_apcs_ipc *apcs; + const struct qcom_apcs_ipc_data *apcs_data; + struct regmap *regmap; + struct resource *res; + void __iomem *base; + unsigned long i; + int ret; + + apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL); + if (!apcs) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + apcs_data = of_device_get_match_data(&pdev->dev); + + apcs->regmap = regmap; + apcs->offset = apcs_data->offset; + + /* Initialize channel identifiers */ + for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++) + apcs->mbox_chans[i].con_priv = (void *)i; + + apcs->mbox.dev = &pdev->dev; + apcs->mbox.ops = &qcom_apcs_ipc_ops; + apcs->mbox.chans = apcs->mbox_chans; + apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans); + + ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox); + if (ret) { + dev_err(&pdev->dev, "failed to register APCS IPC controller\n"); + return ret; + } + + if (apcs_data->clk_name) { + apcs->clk = platform_device_register_data(&pdev->dev, + apcs_data->clk_name, + PLATFORM_DEVID_AUTO, + NULL, 0); + if (IS_ERR(apcs->clk)) + dev_err(&pdev->dev, "failed to register APCS clk\n"); + } + + platform_set_drvdata(pdev, apcs); + + return 0; +} + +static int qcom_apcs_ipc_remove(struct platform_device *pdev) +{ + struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev); + struct platform_device *clk = apcs->clk; + + platform_device_unregister(clk); + + return 0; +} + +/* .data is the offset of the ipc register within the global block */ +static const struct of_device_id qcom_apcs_ipc_of_match[] = { + { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data }, + { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq8074_apcs_data }, + { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data }, + { .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data }, + { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data }, + { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8998_apcs_data }, + { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data }, + { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data }, + { .compatible = "qcom,sdm660-apcs-hmss-global", .data = &sdm660_apcs_data }, + { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data }, + { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data }, + {} +}; +MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match); + +static struct platform_driver qcom_apcs_ipc_driver = { + .probe = qcom_apcs_ipc_probe, + .remove = qcom_apcs_ipc_remove, + .driver = { + .name = "qcom_apcs_ipc", + .of_match_table = qcom_apcs_ipc_of_match, + }, +}; + +static int __init qcom_apcs_ipc_init(void) +{ + return platform_driver_register(&qcom_apcs_ipc_driver); +} +postcore_initcall(qcom_apcs_ipc_init); + +static void __exit qcom_apcs_ipc_exit(void) +{ + platform_driver_unregister(&qcom_apcs_ipc_driver); +} +module_exit(qcom_apcs_ipc_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Qualcomm APCS IPC driver"); |