xref: /openbmc/linux/drivers/soc/fsl/guts.c (revision 31af04cd)
1 /*
2  * Freescale QorIQ Platforms GUTS Driver
3  *
4  * Copyright (C) 2016 Freescale Semiconductor, Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  */
11 
12 #include <linux/io.h>
13 #include <linux/slab.h>
14 #include <linux/module.h>
15 #include <linux/of_fdt.h>
16 #include <linux/sys_soc.h>
17 #include <linux/of_address.h>
18 #include <linux/platform_device.h>
19 #include <linux/fsl/guts.h>
20 
21 struct guts {
22 	struct ccsr_guts __iomem *regs;
23 	bool little_endian;
24 };
25 
26 struct fsl_soc_die_attr {
27 	char	*die;
28 	u32	svr;
29 	u32	mask;
30 };
31 
32 static struct guts *guts;
33 static struct soc_device_attribute soc_dev_attr;
34 static struct soc_device *soc_dev;
35 
36 
37 /* SoC die attribute definition for QorIQ platform */
38 static const struct fsl_soc_die_attr fsl_soc_die[] = {
39 	/*
40 	 * Power Architecture-based SoCs T Series
41 	 */
42 
43 	/* Die: T4240, SoC: T4240/T4160/T4080 */
44 	{ .die		= "T4240",
45 	  .svr		= 0x82400000,
46 	  .mask		= 0xfff00000,
47 	},
48 	/* Die: T1040, SoC: T1040/T1020/T1042/T1022 */
49 	{ .die		= "T1040",
50 	  .svr		= 0x85200000,
51 	  .mask		= 0xfff00000,
52 	},
53 	/* Die: T2080, SoC: T2080/T2081 */
54 	{ .die		= "T2080",
55 	  .svr		= 0x85300000,
56 	  .mask		= 0xfff00000,
57 	},
58 	/* Die: T1024, SoC: T1024/T1014/T1023/T1013 */
59 	{ .die		= "T1024",
60 	  .svr		= 0x85400000,
61 	  .mask		= 0xfff00000,
62 	},
63 
64 	/*
65 	 * ARM-based SoCs LS Series
66 	 */
67 
68 	/* Die: LS1043A, SoC: LS1043A/LS1023A */
69 	{ .die		= "LS1043A",
70 	  .svr		= 0x87920000,
71 	  .mask		= 0xffff0000,
72 	},
73 	/* Die: LS2080A, SoC: LS2080A/LS2040A/LS2085A */
74 	{ .die		= "LS2080A",
75 	  .svr		= 0x87010000,
76 	  .mask		= 0xff3f0000,
77 	},
78 	/* Die: LS1088A, SoC: LS1088A/LS1048A/LS1084A/LS1044A */
79 	{ .die		= "LS1088A",
80 	  .svr		= 0x87030000,
81 	  .mask		= 0xff3f0000,
82 	},
83 	/* Die: LS1012A, SoC: LS1012A */
84 	{ .die		= "LS1012A",
85 	  .svr		= 0x87040000,
86 	  .mask		= 0xffff0000,
87 	},
88 	/* Die: LS1046A, SoC: LS1046A/LS1026A */
89 	{ .die		= "LS1046A",
90 	  .svr		= 0x87070000,
91 	  .mask		= 0xffff0000,
92 	},
93 	/* Die: LS2088A, SoC: LS2088A/LS2048A/LS2084A/LS2044A */
94 	{ .die		= "LS2088A",
95 	  .svr		= 0x87090000,
96 	  .mask		= 0xff3f0000,
97 	},
98 	/* Die: LS1021A, SoC: LS1021A/LS1020A/LS1022A */
99 	{ .die		= "LS1021A",
100 	  .svr		= 0x87000000,
101 	  .mask		= 0xfff70000,
102 	},
103 	{ },
104 };
105 
106 static const struct fsl_soc_die_attr *fsl_soc_die_match(
107 	u32 svr, const struct fsl_soc_die_attr *matches)
108 {
109 	while (matches->svr) {
110 		if (matches->svr == (svr & matches->mask))
111 			return matches;
112 		matches++;
113 	};
114 	return NULL;
115 }
116 
117 u32 fsl_guts_get_svr(void)
118 {
119 	u32 svr = 0;
120 
121 	if (!guts || !guts->regs)
122 		return svr;
123 
124 	if (guts->little_endian)
125 		svr = ioread32(&guts->regs->svr);
126 	else
127 		svr = ioread32be(&guts->regs->svr);
128 
129 	return svr;
130 }
131 EXPORT_SYMBOL(fsl_guts_get_svr);
132 
133 static int fsl_guts_probe(struct platform_device *pdev)
134 {
135 	struct device_node *root, *np = pdev->dev.of_node;
136 	struct device *dev = &pdev->dev;
137 	struct resource *res;
138 	const struct fsl_soc_die_attr *soc_die;
139 	const char *machine;
140 	u32 svr;
141 
142 	/* Initialize guts */
143 	guts = devm_kzalloc(dev, sizeof(*guts), GFP_KERNEL);
144 	if (!guts)
145 		return -ENOMEM;
146 
147 	guts->little_endian = of_property_read_bool(np, "little-endian");
148 
149 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
150 	guts->regs = devm_ioremap_resource(dev, res);
151 	if (IS_ERR(guts->regs))
152 		return PTR_ERR(guts->regs);
153 
154 	/* Register soc device */
155 	root = of_find_node_by_path("/");
156 	if (of_property_read_string(root, "model", &machine))
157 		of_property_read_string_index(root, "compatible", 0, &machine);
158 	of_node_put(root);
159 	if (machine)
160 		soc_dev_attr.machine = devm_kstrdup(dev, machine, GFP_KERNEL);
161 
162 	svr = fsl_guts_get_svr();
163 	soc_die = fsl_soc_die_match(svr, fsl_soc_die);
164 	if (soc_die) {
165 		soc_dev_attr.family = devm_kasprintf(dev, GFP_KERNEL,
166 						     "QorIQ %s", soc_die->die);
167 	} else {
168 		soc_dev_attr.family = devm_kasprintf(dev, GFP_KERNEL, "QorIQ");
169 	}
170 	if (!soc_dev_attr.family)
171 		return -ENOMEM;
172 	soc_dev_attr.soc_id = devm_kasprintf(dev, GFP_KERNEL,
173 					     "svr:0x%08x", svr);
174 	if (!soc_dev_attr.soc_id)
175 		return -ENOMEM;
176 	soc_dev_attr.revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
177 					       (svr >>  4) & 0xf, svr & 0xf);
178 	if (!soc_dev_attr.revision)
179 		return -ENOMEM;
180 
181 	soc_dev = soc_device_register(&soc_dev_attr);
182 	if (IS_ERR(soc_dev))
183 		return PTR_ERR(soc_dev);
184 
185 	pr_info("Machine: %s\n", soc_dev_attr.machine);
186 	pr_info("SoC family: %s\n", soc_dev_attr.family);
187 	pr_info("SoC ID: %s, Revision: %s\n",
188 		soc_dev_attr.soc_id, soc_dev_attr.revision);
189 	return 0;
190 }
191 
192 static int fsl_guts_remove(struct platform_device *dev)
193 {
194 	soc_device_unregister(soc_dev);
195 	return 0;
196 }
197 
198 /*
199  * Table for matching compatible strings, for device tree
200  * guts node, for Freescale QorIQ SOCs.
201  */
202 static const struct of_device_id fsl_guts_of_match[] = {
203 	{ .compatible = "fsl,qoriq-device-config-1.0", },
204 	{ .compatible = "fsl,qoriq-device-config-2.0", },
205 	{ .compatible = "fsl,p1010-guts", },
206 	{ .compatible = "fsl,p1020-guts", },
207 	{ .compatible = "fsl,p1021-guts", },
208 	{ .compatible = "fsl,p1022-guts", },
209 	{ .compatible = "fsl,p1023-guts", },
210 	{ .compatible = "fsl,p2020-guts", },
211 	{ .compatible = "fsl,bsc9131-guts", },
212 	{ .compatible = "fsl,bsc9132-guts", },
213 	{ .compatible = "fsl,mpc8536-guts", },
214 	{ .compatible = "fsl,mpc8544-guts", },
215 	{ .compatible = "fsl,mpc8548-guts", },
216 	{ .compatible = "fsl,mpc8568-guts", },
217 	{ .compatible = "fsl,mpc8569-guts", },
218 	{ .compatible = "fsl,mpc8572-guts", },
219 	{ .compatible = "fsl,ls1021a-dcfg", },
220 	{ .compatible = "fsl,ls1043a-dcfg", },
221 	{ .compatible = "fsl,ls2080a-dcfg", },
222 	{ .compatible = "fsl,ls1088a-dcfg", },
223 	{ .compatible = "fsl,ls1012a-dcfg", },
224 	{ .compatible = "fsl,ls1046a-dcfg", },
225 	{}
226 };
227 MODULE_DEVICE_TABLE(of, fsl_guts_of_match);
228 
229 static struct platform_driver fsl_guts_driver = {
230 	.driver = {
231 		.name = "fsl-guts",
232 		.of_match_table = fsl_guts_of_match,
233 	},
234 	.probe = fsl_guts_probe,
235 	.remove = fsl_guts_remove,
236 };
237 
238 static int __init fsl_guts_init(void)
239 {
240 	return platform_driver_register(&fsl_guts_driver);
241 }
242 core_initcall(fsl_guts_init);
243 
244 static void __exit fsl_guts_exit(void)
245 {
246 	platform_driver_unregister(&fsl_guts_driver);
247 }
248 module_exit(fsl_guts_exit);
249