[PATCH v1 05/15] remoteproc: mediatek: Add SCP core 1 driver for dual-core scp

[Tinghan Shen]

MT8195 SCP is a dual-core processor. The mtk_scp.c driver only controls
SCP core 0. This patch adds a basic driver to control the another core.

Core 1 and core 0 of the SCP are housed in the same subsys.They see
registers and memory in the same way.

Core 1 of the SCP features its own set of core configuration registers,
interrupt controller, timers, and DMAs. The rest of the peripherals
in this subsystem are shared by core 0 and core 1.

As for memory, core 1 has its own cache memory, and the SCP SRAM is shared
by core 0 and core 1.

Signed-off-by: Tinghan Shen <tinghan.shen at mediatek.com>
---
 drivers/remoteproc/Makefile       |  1 +
 drivers/remoteproc/mtk_scp_dual.c | 97 +++++++++++++++++++++++++++++++
 2 files changed, 98 insertions(+)
 create mode 100644 drivers/remoteproc/mtk_scp_dual.c

diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 5478c7cb9e07..84cb687d28da 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_IMX_REMOTEPROC)		+= imx_rproc.o
 obj-$(CONFIG_IMX_DSP_REMOTEPROC)	+= imx_dsp_rproc.o
 obj-$(CONFIG_INGENIC_VPU_RPROC)		+= ingenic_rproc.o
 obj-$(CONFIG_MTK_SCP)			+= mtk_scp.o mtk_scp_ipi.o
+obj-$(CONFIG_MTK_SCP_DUALCORE)		+= mtk_scp_dual.o
 obj-$(CONFIG_OMAP_REMOTEPROC)		+= omap_remoteproc.o
 obj-$(CONFIG_WKUP_M3_RPROC)		+= wkup_m3_rproc.o
 obj-$(CONFIG_DA8XX_REMOTEPROC)		+= da8xx_remoteproc.o
diff --git a/drivers/remoteproc/mtk_scp_dual.c b/drivers/remoteproc/mtk_scp_dual.c
new file mode 100644
index 000000000000..7bc08d26f208
--- /dev/null
+++ b/drivers/remoteproc/mtk_scp_dual.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2022 MediaTek Inc.
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+#include "mtk_common.h"
+#include "remoteproc_internal.h"
+
+static const struct rproc_ops scp_ops;
+
+static int scp_dual_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct mtk_scp *scp;
+	struct rproc *rproc;
+	const char *fw_name = "scp-dual.img";
+	int ret, i;
+	struct resource *res;
+
+	ret = rproc_of_parse_firmware(dev, 0, &fw_name);
+	if (ret < 0 && ret != -EINVAL)
+		return ret;
+
+	rproc = devm_rproc_alloc(dev, np->name, &scp_ops, fw_name, sizeof(*scp));
+	if (!rproc) {
+		dev_err(dev, "unable to allocate remoteproc\n");
+		return -ENOMEM;
+	}
+
+	scp = (struct mtk_scp *)rproc->priv;
+	scp->rproc = rproc;
+	scp->dev = dev;
+	platform_set_drvdata(pdev, scp);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
+	scp->sram_base = devm_ioremap(dev, res->start, resource_size(res));
+	if (IS_ERR(scp->sram_base))
+		return dev_err_probe(dev, PTR_ERR(scp->sram_base),
+				     "Failed to parse and map sram memory\n");
+
+	scp->sram_size = resource_size(res);
+	scp->sram_phys = res->start;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
+	scp->reg_base = devm_ioremap(dev, res->start, resource_size(res));
+	if (IS_ERR(scp->reg_base))
+		return dev_err_probe(dev, PTR_ERR(scp->reg_base),
+				     "Failed to parse and map cfg memory\n");
+
+	mutex_init(&scp->send_lock);
+	for (i = 0; i < SCP_IPI_MAX; i++)
+		mutex_init(&scp->ipi_desc[i].lock);
+
+	init_waitqueue_head(&scp->run.wq);
+	init_waitqueue_head(&scp->ack_wq);
+
+	return 0;
+}
+
+static int scp_dual_remove(struct platform_device *pdev)
+{
+	struct mtk_scp *scp = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < SCP_IPI_MAX; i++)
+		mutex_destroy(&scp->ipi_desc[i].lock);
+	mutex_destroy(&scp->send_lock);
+
+	return 0;
+}
+
+static const struct of_device_id mtk_scp_dual_of_match[] = {
+	{ .compatible = "mediatek,mt8195-scp-dual" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mtk_scp_dual_of_match);
+
+static struct platform_driver mtk_scp_dual_driver = {
+	.probe = scp_dual_probe,
+	.remove = scp_dual_remove,
+	.driver = {
+		.name = "mtk-scp-dual",
+		.of_match_table = mtk_scp_dual_of_match,
+	},
+};
+
+module_platform_driver(mtk_scp_dual_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MediaTek SCP dualcore control driver");
-- 
2.18.0