1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * FSL SoC setup code
4 *
5 * Maintained by Kumar Gala (see MAINTAINERS for contact information)
6 *
7 * 2006 (c) MontaVista Software, Inc.
8 * Vitaly Bordug <vbordug@ru.mvista.com>
9 */
10
11 #include <linux/stddef.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/errno.h>
15 #include <linux/major.h>
16 #include <linux/delay.h>
17 #include <linux/irq.h>
18 #include <linux/export.h>
19 #include <linux/device.h>
20 #include <linux/platform_device.h>
21 #include <linux/of.h>
22 #include <linux/phy.h>
23 #include <linux/spi/spi.h>
24 #include <linux/fsl_devices.h>
25 #include <linux/reboot.h>
26
27 #include <linux/atomic.h>
28 #include <asm/io.h>
29 #include <asm/irq.h>
30 #include <asm/time.h>
31 #include <asm/machdep.h>
32 #include <sysdev/fsl_soc.h>
33 #include <mm/mmu_decl.h>
34 #include <asm/cpm2.h>
35 #include <asm/fsl_hcalls.h> /* For the Freescale hypervisor */
36
37 static phys_addr_t immrbase = -1;
38
39 phys_addr_t get_immrbase(void)
40 {
41 struct device_node *soc;
42
43 if (immrbase != -1)
44 return immrbase;
45
46 soc = of_find_node_by_type(NULL, "soc");
47 if (soc) {
48 struct resource res;
49
50 if (!of_range_to_resource(soc, 0, &res))
51 immrbase = res.start;
52
53 of_node_put(soc);
54 }
55
56 return immrbase;
57 }
58
59 EXPORT_SYMBOL(get_immrbase);
60
61 u32 fsl_get_sys_freq(void)
62 {
63 static u32 sysfreq = -1;
64 struct device_node *soc;
65
66 if (sysfreq != -1)
67 return sysfreq;
68
69 soc = of_find_node_by_type(NULL, "soc");
70 if (!soc)
71 return -1;
72
73 of_property_read_u32(soc, "clock-frequency", &sysfreq);
74 if (sysfreq == -1 || !sysfreq)
75 of_property_read_u32(soc, "bus-frequency", &sysfreq);
76
77 of_node_put(soc);
78 return sysfreq;
79 }
80 EXPORT_SYMBOL(fsl_get_sys_freq);
81
82 #if defined(CONFIG_CPM) || defined(CONFIG_QUICC_ENGINE)
83
84 u32 get_brgfreq(void)
85 {
86 static u32 brgfreq = -1;
87 struct device_node *node;
88
89 if (brgfreq != -1)
90 return brgfreq;
91
92 node = of_find_compatible_node(NULL, NULL, "fsl,cpm-brg");
93 if (node) {
94 of_property_read_u32(node, "clock-frequency", &brgfreq);
95 of_node_put(node);
96 return brgfreq;
97 }
98
99 /* Legacy device binding -- will go away when no users are left. */
100 node = of_find_node_by_type(NULL, "cpm");
101 if (!node)
102 node = of_find_compatible_node(NULL, NULL, "fsl,qe");
103 if (!node)
104 node = of_find_node_by_type(NULL, "qe");
105
106 if (node) {
107 of_property_read_u32(node, "brg-frequency", &brgfreq);
108 if (brgfreq == -1 || !brgfreq)
109 if (!of_property_read_u32(node, "bus-frequency",
110 &brgfreq))
111 brgfreq /= 2;
112 of_node_put(node);
113 }
114
115 return brgfreq;
116 }
117
118 EXPORT_SYMBOL(get_brgfreq);
119
120 u32 get_baudrate(void)
121 {
122 static u32 fs_baudrate = -1;
123 struct device_node *node;
124
125 if (fs_baudrate != -1)
126 return fs_baudrate;
127
128 node = of_find_node_by_type(NULL, "serial");
129 if (node) {
130 of_property_read_u32(node, "current-speed", &fs_baudrate);
131 of_node_put(node);
132 }
133
134 return fs_baudrate;
135 }
136
137 EXPORT_SYMBOL(get_baudrate);
138 #endif /* CONFIG_CPM2 */
139
140 #if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
141 static __be32 __iomem *rstcr;
142
143 static int fsl_rstcr_restart(struct notifier_block *this,
144 unsigned long mode, void *cmd)
145 {
146 local_irq_disable();
147 /* set reset control register */
148 out_be32(rstcr, 0x2); /* HRESET_REQ */
149
150 return NOTIFY_DONE;
151 }
152
153 static int __init setup_rstcr(void)
154 {
155 struct device_node *np;
156
157 static struct notifier_block restart_handler = {
158 .notifier_call = fsl_rstcr_restart,
159 .priority = 128,
160 };
161
162 for_each_node_by_name(np, "global-utilities") {
163 if (of_property_read_bool(np, "fsl,has-rstcr")) {
164 rstcr = of_iomap(np, 0) + 0xb0;
165 if (!rstcr) {
166 printk (KERN_ERR "Error: reset control "
167 "register not mapped!\n");
168 } else {
169 register_restart_handler(&restart_handler);
170 }
171 break;
172 }
173 }
174
175 of_node_put(np);
176
177 return 0;
178 }
179
180 arch_initcall(setup_rstcr);
181
182 #endif
183
184 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
185 struct platform_diu_data_ops diu_ops;
186 EXPORT_SYMBOL(diu_ops);
187 #endif
188
189 #ifdef CONFIG_EPAPR_PARAVIRT
190 /*
191 * Restart the current partition
192 *
193 * This function should be assigned to the ppc_md.restart function pointer,
194 * to initiate a partition restart when we're running under the Freescale
195 * hypervisor.
196 */
197 void __noreturn fsl_hv_restart(char *cmd)
198 {
199 pr_info("hv restart\n");
200 fh_partition_restart(-1);
201 while (1) ;
202 }
203
204 /*
205 * Halt the current partition
206 *
207 * This function should be assigned to the pm_power_off and ppc_md.halt
208 * function pointers, to shut down the partition when we're running under
209 * the Freescale hypervisor.
210 */
211 void __noreturn fsl_hv_halt(void)
212 {
213 pr_info("hv exit\n");
214 fh_partition_stop(-1);
215 while (1) ;
216 }
217 #endif
218
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