xref: /openbmc/linux/arch/powerpc/sysdev/fsl_soc.c (revision 62e106c8)
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 
get_immrbase(void)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 
fsl_get_sys_freq(void)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 
get_brgfreq(void)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 
get_baudrate(void)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 
fsl_rstcr_restart(struct notifier_block * this,unsigned long mode,void * cmd)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 
setup_rstcr(void)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  */
fsl_hv_restart(char * cmd)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  */
fsl_hv_halt(void)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