1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/i3c/master/aspeed-i3c-global.c b/drivers/i3c/master/aspeed-i3c-global.c
new file mode 100644
index 000000000000..93292ad6652d
--- /dev/null
+++ b/drivers/i3c/master/aspeed-i3c-global.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 ASPEED Technology Inc.
+
+#include <linux/clk.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/io.h>
+#include <linux/reset.h>
+#include <linux/delay.h>
+
+#define ASPEED_I3CG_CTRL(x)		(0x10 + (x * 0x10))
+#define ASPEED_I3CG_SET(x)		(0x14 + (x * 0x10))
+
+#define DEF_SLV_INST_ID			0x4
+#define DEF_SLV_STATIC_ADDR		0x74
+
+union i3c_set_reg {
+	uint32_t value;
+	struct {
+		unsigned int i2c_mode : 1;	/* bit[0] */
+		unsigned int test_mode : 1;	/* bit[1] */
+		unsigned int act_mode : 2;	/* bit[ 3: 2] */
+		unsigned int pending_int : 4;	/* bit[ 7: 4] */
+		unsigned int sa : 7;		/* bit[14: 8] */
+		unsigned int sa_en : 1;		/* bit[15] */
+		unsigned int inst_id : 4;	/* bit[19:16] */
+		unsigned int rsvd : 12;		/* bit[31:20] */
+	} fields;
+};
+
+
+struct aspeed_i3c_global {
+	void __iomem		*base;
+	struct reset_control	*rst;
+};
+
+static const struct of_device_id aspeed_i3c_global_of_table[] = {
+	{ .compatible = "aspeed,ast2600-i3c-global", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, aspeed_i3c_global_of_table);
+
+static int aspeed_i3c_global_probe(struct platform_device *pdev)
+{
+	struct aspeed_i3c_global *i3c_global;
+	union i3c_set_reg reg;
+	int i, ret;
+	u32 num_of_i3cs;
+
+	i3c_global = devm_kzalloc(&pdev->dev, sizeof(*i3c_global), GFP_KERNEL);
+	if (!i3c_global)
+		return -ENOMEM;
+
+	i3c_global->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(i3c_global->base))
+		return PTR_ERR(i3c_global->base);
+
+	i3c_global->rst = devm_reset_control_get(&pdev->dev, NULL);
+	if (IS_ERR(i3c_global->rst)) {
+		dev_err(&pdev->dev,
+			"missing or invalid reset controller device tree entry");
+		return PTR_ERR(i3c_global->rst);
+	}
+
+	reset_control_assert(i3c_global->rst);
+	udelay(3);
+	reset_control_deassert(i3c_global->rst);
+
+	ret = of_property_read_u32(pdev->dev.of_node, "ni3cs", &num_of_i3cs);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to get number of i3c devices");
+		return -EINVAL;
+	}
+
+	reg.value = 0;
+	reg.fields.inst_id = DEF_SLV_INST_ID;
+	reg.fields.sa = DEF_SLV_STATIC_ADDR;
+	reg.fields.pending_int = 0xc;
+	reg.fields.act_mode = 0x1;
+	for (i = 0; i < num_of_i3cs; i++)
+		writel(reg.value, i3c_global->base + ASPEED_I3CG_SET(i));
+
+	dev_info(&pdev->dev, "i3c global control registered\n");
+
+	return 0;
+}
+
+static struct platform_driver aspeed_i3c_driver = {
+	.probe  = aspeed_i3c_global_probe,
+	.driver = {
+		.name = KBUILD_MODNAME,
+		.of_match_table = of_match_ptr(aspeed_i3c_global_of_table),
+	},
+};
+module_platform_driver(aspeed_i3c_driver);
+
+MODULE_AUTHOR("Ryan Chen");
+MODULE_DESCRIPTION("ASPEED I3C Global Driver");
+MODULE_LICENSE("GPL v2");