xref: /openbmc/linux/arch/powerpc/sysdev/fsl_soc.c (revision b34e08d5)
1 /*
2  * FSL SoC setup code
3  *
4  * Maintained by Kumar Gala (see MAINTAINERS for contact information)
5  *
6  * 2006 (c) MontaVista Software, Inc.
7  * Vitaly Bordug <vbordug@ru.mvista.com>
8  *
9  * This program is free software; you can redistribute  it and/or modify it
10  * under  the terms of  the GNU General  Public License as published by the
11  * Free Software Foundation;  either version 2 of the  License, or (at your
12  * option) any later version.
13  */
14 
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/errno.h>
19 #include <linux/major.h>
20 #include <linux/delay.h>
21 #include <linux/irq.h>
22 #include <linux/export.h>
23 #include <linux/device.h>
24 #include <linux/platform_device.h>
25 #include <linux/of.h>
26 #include <linux/of_platform.h>
27 #include <linux/phy.h>
28 #include <linux/phy_fixed.h>
29 #include <linux/spi/spi.h>
30 #include <linux/fsl_devices.h>
31 #include <linux/fs_enet_pd.h>
32 #include <linux/fs_uart_pd.h>
33 
34 #include <linux/atomic.h>
35 #include <asm/io.h>
36 #include <asm/irq.h>
37 #include <asm/time.h>
38 #include <asm/prom.h>
39 #include <asm/machdep.h>
40 #include <sysdev/fsl_soc.h>
41 #include <mm/mmu_decl.h>
42 #include <asm/cpm2.h>
43 #include <asm/fsl_hcalls.h>	/* For the Freescale hypervisor */
44 
45 extern void init_fcc_ioports(struct fs_platform_info*);
46 extern void init_fec_ioports(struct fs_platform_info*);
47 extern void init_smc_ioports(struct fs_uart_platform_info*);
48 static phys_addr_t immrbase = -1;
49 
50 phys_addr_t get_immrbase(void)
51 {
52 	struct device_node *soc;
53 
54 	if (immrbase != -1)
55 		return immrbase;
56 
57 	soc = of_find_node_by_type(NULL, "soc");
58 	if (soc) {
59 		int size;
60 		u32 naddr;
61 		const __be32 *prop = of_get_property(soc, "#address-cells", &size);
62 
63 		if (prop && size == 4)
64 			naddr = be32_to_cpup(prop);
65 		else
66 			naddr = 2;
67 
68 		prop = of_get_property(soc, "ranges", &size);
69 		if (prop)
70 			immrbase = of_translate_address(soc, prop + naddr);
71 
72 		of_node_put(soc);
73 	}
74 
75 	return immrbase;
76 }
77 
78 EXPORT_SYMBOL(get_immrbase);
79 
80 static u32 sysfreq = -1;
81 
82 u32 fsl_get_sys_freq(void)
83 {
84 	struct device_node *soc;
85 	const u32 *prop;
86 	int size;
87 
88 	if (sysfreq != -1)
89 		return sysfreq;
90 
91 	soc = of_find_node_by_type(NULL, "soc");
92 	if (!soc)
93 		return -1;
94 
95 	prop = of_get_property(soc, "clock-frequency", &size);
96 	if (!prop || size != sizeof(*prop) || *prop == 0)
97 		prop = of_get_property(soc, "bus-frequency", &size);
98 
99 	if (prop && size == sizeof(*prop))
100 		sysfreq = *prop;
101 
102 	of_node_put(soc);
103 	return sysfreq;
104 }
105 EXPORT_SYMBOL(fsl_get_sys_freq);
106 
107 #if defined(CONFIG_CPM2) || defined(CONFIG_QUICC_ENGINE) || defined(CONFIG_8xx)
108 
109 static u32 brgfreq = -1;
110 
111 u32 get_brgfreq(void)
112 {
113 	struct device_node *node;
114 	const unsigned int *prop;
115 	int size;
116 
117 	if (brgfreq != -1)
118 		return brgfreq;
119 
120 	node = of_find_compatible_node(NULL, NULL, "fsl,cpm-brg");
121 	if (node) {
122 		prop = of_get_property(node, "clock-frequency", &size);
123 		if (prop && size == 4)
124 			brgfreq = *prop;
125 
126 		of_node_put(node);
127 		return brgfreq;
128 	}
129 
130 	/* Legacy device binding -- will go away when no users are left. */
131 	node = of_find_node_by_type(NULL, "cpm");
132 	if (!node)
133 		node = of_find_compatible_node(NULL, NULL, "fsl,qe");
134 	if (!node)
135 		node = of_find_node_by_type(NULL, "qe");
136 
137 	if (node) {
138 		prop = of_get_property(node, "brg-frequency", &size);
139 		if (prop && size == 4)
140 			brgfreq = *prop;
141 
142 		if (brgfreq == -1 || brgfreq == 0) {
143 			prop = of_get_property(node, "bus-frequency", &size);
144 			if (prop && size == 4)
145 				brgfreq = *prop / 2;
146 		}
147 		of_node_put(node);
148 	}
149 
150 	return brgfreq;
151 }
152 
153 EXPORT_SYMBOL(get_brgfreq);
154 
155 static u32 fs_baudrate = -1;
156 
157 u32 get_baudrate(void)
158 {
159 	struct device_node *node;
160 
161 	if (fs_baudrate != -1)
162 		return fs_baudrate;
163 
164 	node = of_find_node_by_type(NULL, "serial");
165 	if (node) {
166 		int size;
167 		const unsigned int *prop = of_get_property(node,
168 				"current-speed", &size);
169 
170 		if (prop)
171 			fs_baudrate = *prop;
172 		of_node_put(node);
173 	}
174 
175 	return fs_baudrate;
176 }
177 
178 EXPORT_SYMBOL(get_baudrate);
179 #endif /* CONFIG_CPM2 */
180 
181 #ifdef CONFIG_FIXED_PHY
182 static int __init of_add_fixed_phys(void)
183 {
184 	int ret;
185 	struct device_node *np;
186 	u32 *fixed_link;
187 	struct fixed_phy_status status = {};
188 
189 	for_each_node_by_name(np, "ethernet") {
190 		fixed_link  = (u32 *)of_get_property(np, "fixed-link", NULL);
191 		if (!fixed_link)
192 			continue;
193 
194 		status.link = 1;
195 		status.duplex = fixed_link[1];
196 		status.speed = fixed_link[2];
197 		status.pause = fixed_link[3];
198 		status.asym_pause = fixed_link[4];
199 
200 		ret = fixed_phy_add(PHY_POLL, fixed_link[0], &status);
201 		if (ret) {
202 			of_node_put(np);
203 			return ret;
204 		}
205 	}
206 
207 	return 0;
208 }
209 arch_initcall(of_add_fixed_phys);
210 #endif /* CONFIG_FIXED_PHY */
211 
212 #if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
213 static __be32 __iomem *rstcr;
214 
215 static int __init setup_rstcr(void)
216 {
217 	struct device_node *np;
218 
219 	for_each_node_by_name(np, "global-utilities") {
220 		if ((of_get_property(np, "fsl,has-rstcr", NULL))) {
221 			rstcr = of_iomap(np, 0) + 0xb0;
222 			if (!rstcr)
223 				printk (KERN_ERR "Error: reset control "
224 						"register not mapped!\n");
225 			break;
226 		}
227 	}
228 
229 	if (!rstcr && ppc_md.restart == fsl_rstcr_restart)
230 		printk(KERN_ERR "No RSTCR register, warm reboot won't work\n");
231 
232 	if (np)
233 		of_node_put(np);
234 
235 	return 0;
236 }
237 
238 arch_initcall(setup_rstcr);
239 
240 void fsl_rstcr_restart(char *cmd)
241 {
242 	local_irq_disable();
243 	if (rstcr)
244 		/* set reset control register */
245 		out_be32(rstcr, 0x2);	/* HRESET_REQ */
246 
247 	while (1) ;
248 }
249 #endif
250 
251 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
252 struct platform_diu_data_ops diu_ops;
253 EXPORT_SYMBOL(diu_ops);
254 #endif
255 
256 #ifdef CONFIG_EPAPR_PARAVIRT
257 /*
258  * Restart the current partition
259  *
260  * This function should be assigned to the ppc_md.restart function pointer,
261  * to initiate a partition restart when we're running under the Freescale
262  * hypervisor.
263  */
264 void fsl_hv_restart(char *cmd)
265 {
266 	pr_info("hv restart\n");
267 	fh_partition_restart(-1);
268 }
269 
270 /*
271  * Halt the current partition
272  *
273  * This function should be assigned to the ppc_md.power_off and ppc_md.halt
274  * function pointers, to shut down the partition when we're running under
275  * the Freescale hypervisor.
276  */
277 void fsl_hv_halt(void)
278 {
279 	pr_info("hv exit\n");
280 	fh_partition_stop(-1);
281 }
282 #endif
283