1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * RZ/V2H System controller (SYS) driver
4  *
5  * Copyright (C) 2025 Renesas Electronics Corp.
6  */
7 
8 #include <linux/bitfield.h>
9 #include <linux/bits.h>
10 #include <linux/device.h>
11 #include <linux/init.h>
12 #include <linux/io.h>
13 
14 #include "rz-sysc.h"
15 
16 /* Register Offsets */
17 #define SYS_LSI_MODE		0x300
18 /*
19  * BOOTPLLCA[1:0]
20  *	    [0,0] => 1.1GHZ
21  *	    [0,1] => 1.5GHZ
22  *	    [1,0] => 1.6GHZ
23  *	    [1,1] => 1.7GHZ
24  */
25 #define SYS_LSI_MODE_STAT_BOOTPLLCA55	GENMASK(12, 11)
26 #define SYS_LSI_MODE_CA55_1_7GHZ	0x3
27 
28 #define SYS_LSI_PRR			0x308
29 #define SYS_LSI_PRR_GPU_DIS		BIT(0)
30 #define SYS_LSI_PRR_ISP_DIS		BIT(4)
31 
rzv2h_sys_print_id(struct device * dev,void __iomem * sysc_base,struct soc_device_attribute * soc_dev_attr)32 static void rzv2h_sys_print_id(struct device *dev,
33 				void __iomem *sysc_base,
34 				struct soc_device_attribute *soc_dev_attr)
35 {
36 	bool gpu_enabled, isp_enabled;
37 	u32 prr_val, mode_val;
38 
39 	prr_val = readl(sysc_base + SYS_LSI_PRR);
40 	mode_val = readl(sysc_base + SYS_LSI_MODE);
41 
42 	/* Check GPU and ISP configuration */
43 	gpu_enabled = !(prr_val & SYS_LSI_PRR_GPU_DIS);
44 	isp_enabled = !(prr_val & SYS_LSI_PRR_ISP_DIS);
45 
46 	dev_info(dev, "Detected Renesas %s %s Rev %s%s%s\n",
47 		 soc_dev_attr->family, soc_dev_attr->soc_id, soc_dev_attr->revision,
48 		 gpu_enabled ? " with GE3D (Mali-G31)" : "",
49 		 isp_enabled ? " with ISP (Mali-C55)" : "");
50 
51 	/* Check CA55 PLL configuration */
52 	if (FIELD_GET(SYS_LSI_MODE_STAT_BOOTPLLCA55, mode_val) != SYS_LSI_MODE_CA55_1_7GHZ)
53 		dev_warn(dev, "CA55 PLL is not set to 1.7GHz\n");
54 }
55 
56 static const struct rz_sysc_soc_id_init_data rzv2h_sys_soc_id_init_data __initconst = {
57 	.family = "RZ/V2H",
58 	.id = 0x847a447,
59 	.devid_offset = 0x304,
60 	.revision_mask = GENMASK(31, 28),
61 	.specific_id_mask = GENMASK(27, 0),
62 	.print_id = rzv2h_sys_print_id,
63 };
64 
65 const struct rz_sysc_init_data rzv2h_sys_init_data = {
66 	.soc_id_init_data = &rzv2h_sys_soc_id_init_data,
67 };
68