// SPDX-License-Identifier: GPL-2.0-only
/*
 * TI K3 DSP Remote Processor(s) driver
 *
 * Copyright (C) 2018-2022 Texas Instruments Incorporated - https://www.ti.com/
 *	Suman Anna <s-anna@ti.com>
 */

#include <linux/io.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_reserved_mem.h>
#include <linux/omap-mailbox.h>
#include <linux/platform_device.h>
#include <linux/remoteproc.h>
#include <linux/reset.h>
#include <linux/slab.h>

#include "omap_remoteproc.h"
#include "remoteproc_internal.h"
#include "ti_sci_proc.h"
#include "ti_k3_common.h"

/*
 * Power up the DSP remote processor.
 *
 * This function will be invoked only after the firmware for this rproc
 * was loaded, parsed successfully, and all of its resource requirements
 * were met. This callback is invoked only in remoteproc mode.
 */
static int k3_dsp_rproc_start(struct rproc *rproc)
{
	struct k3_rproc *kproc = rproc->priv;
	struct device *dev = kproc->dev;
	u32 boot_addr;
	int ret;

	boot_addr = rproc->bootaddr;
	if (boot_addr & (kproc->data->boot_align_addr - 1)) {
		dev_err(dev, "invalid boot address 0x%x, must be aligned on a 0x%x boundary\n",
			boot_addr, kproc->data->boot_align_addr);
		return -EINVAL;
	}

	dev_dbg(dev, "booting DSP core using boot addr = 0x%x\n", boot_addr);
	ret = ti_sci_proc_set_config(kproc->tsp, boot_addr, 0, 0);
	if (ret)
		return ret;

	/* Call the K3 common start function after doing DSP specific stuff */
	ret = k3_rproc_start(rproc);
	if (ret)
		return ret;

	return 0;
}

static const struct rproc_ops k3_dsp_rproc_ops = {
	.start			= k3_dsp_rproc_start,
	.stop			= k3_rproc_stop,
	.attach			= k3_rproc_attach,
	.detach			= k3_rproc_detach,
	.kick			= k3_rproc_kick,
	.da_to_va		= k3_rproc_da_to_va,
	.get_loaded_rsc_table	= k3_get_loaded_rsc_table,
};

static int k3_dsp_rproc_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	const struct k3_rproc_dev_data *data;
	struct k3_rproc *kproc;
	struct rproc *rproc;
	const char *fw_name;
	bool p_state = false;
	int ret = 0;

	data = of_device_get_match_data(dev);
	if (!data)
		return -ENODEV;

	ret = rproc_of_parse_firmware(dev, 0, &fw_name);
	if (ret)
		return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");

	rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_dsp_rproc_ops,
				 fw_name, sizeof(*kproc));
	if (!rproc)
		return -ENOMEM;

	rproc->has_iommu = false;
	rproc->recovery_disabled = true;
	if (data->uses_lreset) {
		rproc->ops->prepare = k3_rproc_prepare;
		rproc->ops->unprepare = k3_rproc_unprepare;
	}
	kproc = rproc->priv;
	kproc->rproc = rproc;
	kproc->dev = dev;
	kproc->data = data;

	ret = k3_rproc_request_mbox(rproc);
	if (ret)
		return ret;

	kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
	if (IS_ERR(kproc->ti_sci))
		return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
				     "failed to get ti-sci handle\n");

	ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
	if (ret)
		return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");

	kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
	if (IS_ERR(kproc->reset))
		return dev_err_probe(dev, PTR_ERR(kproc->reset),
				     "failed to get reset\n");

	kproc->tsp = ti_sci_proc_of_get_tsp(dev, kproc->ti_sci);
	if (IS_ERR(kproc->tsp))
		return dev_err_probe(dev, PTR_ERR(kproc->tsp),
				     "failed to construct ti-sci proc control\n");

	ret = ti_sci_proc_request(kproc->tsp);
	if (ret < 0) {
		dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
		return ret;
	}
	ret = devm_add_action_or_reset(dev, k3_release_tsp, kproc->tsp);
	if (ret)
		return ret;

	ret = k3_rproc_of_get_memories(pdev, kproc);
	if (ret)
		return ret;

	ret = k3_reserved_mem_init(kproc);
	if (ret)
		return dev_err_probe(dev, ret, "reserved memory init failed\n");

	ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
					       NULL, &p_state);
	if (ret)
		return dev_err_probe(dev, ret, "failed to get initial state, mode cannot be determined\n");

	/* configure J721E devices for either remoteproc or IPC-only mode */
	if (p_state) {
		dev_info(dev, "configured DSP for IPC-only mode\n");
		rproc->state = RPROC_DETACHED;
	} else {
		dev_info(dev, "configured DSP for remoteproc mode\n");
	}

	ret = devm_rproc_add(dev, rproc);
	if (ret)
		return dev_err_probe(dev, ret, "failed to add register device with remoteproc core\n");

	platform_set_drvdata(pdev, kproc);

	return 0;
}

static void k3_dsp_rproc_remove(struct platform_device *pdev)
{
	struct k3_rproc *kproc = platform_get_drvdata(pdev);
	struct rproc *rproc = kproc->rproc;
	struct device *dev = &pdev->dev;
	int ret;

	if (rproc->state == RPROC_ATTACHED) {
		ret = rproc_detach(rproc);
		if (ret)
			dev_err(dev, "failed to detach proc (%pe)\n", ERR_PTR(ret));
	}
}

static const struct k3_rproc_mem_data c66_mems[] = {
	{ .name = "l2sram", .dev_addr = 0x800000 },
	{ .name = "l1pram", .dev_addr = 0xe00000 },
	{ .name = "l1dram", .dev_addr = 0xf00000 },
};

/* C71x cores only have a L1P Cache, there are no L1P SRAMs */
static const struct k3_rproc_mem_data c71_mems[] = {
	{ .name = "l2sram", .dev_addr = 0x800000 },
	{ .name = "l1dram", .dev_addr = 0xe00000 },
};

static const struct k3_rproc_mem_data c7xv_mems[] = {
	{ .name = "l2sram", .dev_addr = 0x800000 },
};

static const struct k3_rproc_dev_data c66_data = {
	.mems = c66_mems,
	.num_mems = ARRAY_SIZE(c66_mems),
	.boot_align_addr = SZ_1K,
	.uses_lreset = true,
};

static const struct k3_rproc_dev_data c71_data = {
	.mems = c71_mems,
	.num_mems = ARRAY_SIZE(c71_mems),
	.boot_align_addr = SZ_2M,
	.uses_lreset = false,
};

static const struct k3_rproc_dev_data c7xv_data = {
	.mems = c7xv_mems,
	.num_mems = ARRAY_SIZE(c7xv_mems),
	.boot_align_addr = SZ_2M,
	.uses_lreset = false,
};

static const struct of_device_id k3_dsp_of_match[] = {
	{ .compatible = "ti,j721e-c66-dsp", .data = &c66_data, },
	{ .compatible = "ti,j721e-c71-dsp", .data = &c71_data, },
	{ .compatible = "ti,j721s2-c71-dsp", .data = &c71_data, },
	{ .compatible = "ti,am62a-c7xv-dsp", .data = &c7xv_data, },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, k3_dsp_of_match);

static struct platform_driver k3_dsp_rproc_driver = {
	.probe	= k3_dsp_rproc_probe,
	.remove = k3_dsp_rproc_remove,
	.driver	= {
		.name = "k3-dsp-rproc",
		.of_match_table = k3_dsp_of_match,
	},
};

module_platform_driver(k3_dsp_rproc_driver);

MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TI K3 DSP Remoteproc driver");