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// 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");
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