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Linux/arch/powerpc/sysdev/fsl_soc.c

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  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/spi/spi.h>
 29 #include <linux/fsl_devices.h>
 30 #include <linux/fs_enet_pd.h>
 31 #include <linux/fs_uart_pd.h>
 32 
 33 #include <linux/atomic.h>
 34 #include <asm/io.h>
 35 #include <asm/irq.h>
 36 #include <asm/time.h>
 37 #include <asm/prom.h>
 38 #include <asm/machdep.h>
 39 #include <sysdev/fsl_soc.h>
 40 #include <mm/mmu_decl.h>
 41 #include <asm/cpm2.h>
 42 #include <asm/fsl_hcalls.h>     /* For the Freescale hypervisor */
 43 
 44 extern void init_fcc_ioports(struct fs_platform_info*);
 45 extern void init_fec_ioports(struct fs_platform_info*);
 46 extern void init_smc_ioports(struct fs_uart_platform_info*);
 47 static phys_addr_t immrbase = -1;
 48 
 49 phys_addr_t get_immrbase(void)
 50 {
 51         struct device_node *soc;
 52 
 53         if (immrbase != -1)
 54                 return immrbase;
 55 
 56         soc = of_find_node_by_type(NULL, "soc");
 57         if (soc) {
 58                 int size;
 59                 u32 naddr;
 60                 const __be32 *prop = of_get_property(soc, "#address-cells", &size);
 61 
 62                 if (prop && size == 4)
 63                         naddr = be32_to_cpup(prop);
 64                 else
 65                         naddr = 2;
 66 
 67                 prop = of_get_property(soc, "ranges", &size);
 68                 if (prop)
 69                         immrbase = of_translate_address(soc, prop + naddr);
 70 
 71                 of_node_put(soc);
 72         }
 73 
 74         return immrbase;
 75 }
 76 
 77 EXPORT_SYMBOL(get_immrbase);
 78 
 79 static u32 sysfreq = -1;
 80 
 81 u32 fsl_get_sys_freq(void)
 82 {
 83         struct device_node *soc;
 84         const u32 *prop;
 85         int size;
 86 
 87         if (sysfreq != -1)
 88                 return sysfreq;
 89 
 90         soc = of_find_node_by_type(NULL, "soc");
 91         if (!soc)
 92                 return -1;
 93 
 94         prop = of_get_property(soc, "clock-frequency", &size);
 95         if (!prop || size != sizeof(*prop) || *prop == 0)
 96                 prop = of_get_property(soc, "bus-frequency", &size);
 97 
 98         if (prop && size == sizeof(*prop))
 99                 sysfreq = *prop;
100 
101         of_node_put(soc);
102         return sysfreq;
103 }
104 EXPORT_SYMBOL(fsl_get_sys_freq);
105 
106 #if defined(CONFIG_CPM2) || defined(CONFIG_QUICC_ENGINE) || defined(CONFIG_8xx)
107 
108 static u32 brgfreq = -1;
109 
110 u32 get_brgfreq(void)
111 {
112         struct device_node *node;
113         const unsigned int *prop;
114         int size;
115 
116         if (brgfreq != -1)
117                 return brgfreq;
118 
119         node = of_find_compatible_node(NULL, NULL, "fsl,cpm-brg");
120         if (node) {
121                 prop = of_get_property(node, "clock-frequency", &size);
122                 if (prop && size == 4)
123                         brgfreq = *prop;
124 
125                 of_node_put(node);
126                 return brgfreq;
127         }
128 
129         /* Legacy device binding -- will go away when no users are left. */
130         node = of_find_node_by_type(NULL, "cpm");
131         if (!node)
132                 node = of_find_compatible_node(NULL, NULL, "fsl,qe");
133         if (!node)
134                 node = of_find_node_by_type(NULL, "qe");
135 
136         if (node) {
137                 prop = of_get_property(node, "brg-frequency", &size);
138                 if (prop && size == 4)
139                         brgfreq = *prop;
140 
141                 if (brgfreq == -1 || brgfreq == 0) {
142                         prop = of_get_property(node, "bus-frequency", &size);
143                         if (prop && size == 4)
144                                 brgfreq = *prop / 2;
145                 }
146                 of_node_put(node);
147         }
148 
149         return brgfreq;
150 }
151 
152 EXPORT_SYMBOL(get_brgfreq);
153 
154 static u32 fs_baudrate = -1;
155 
156 u32 get_baudrate(void)
157 {
158         struct device_node *node;
159 
160         if (fs_baudrate != -1)
161                 return fs_baudrate;
162 
163         node = of_find_node_by_type(NULL, "serial");
164         if (node) {
165                 int size;
166                 const unsigned int *prop = of_get_property(node,
167                                 "current-speed", &size);
168 
169                 if (prop)
170                         fs_baudrate = *prop;
171                 of_node_put(node);
172         }
173 
174         return fs_baudrate;
175 }
176 
177 EXPORT_SYMBOL(get_baudrate);
178 #endif /* CONFIG_CPM2 */
179 
180 #if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
181 static __be32 __iomem *rstcr;
182 
183 static int __init setup_rstcr(void)
184 {
185         struct device_node *np;
186 
187         for_each_node_by_name(np, "global-utilities") {
188                 if ((of_get_property(np, "fsl,has-rstcr", NULL))) {
189                         rstcr = of_iomap(np, 0) + 0xb0;
190                         if (!rstcr)
191                                 printk (KERN_ERR "Error: reset control "
192                                                 "register not mapped!\n");
193                         break;
194                 }
195         }
196 
197         if (!rstcr && ppc_md.restart == fsl_rstcr_restart)
198                 printk(KERN_ERR "No RSTCR register, warm reboot won't work\n");
199 
200         of_node_put(np);
201 
202         return 0;
203 }
204 
205 arch_initcall(setup_rstcr);
206 
207 void fsl_rstcr_restart(char *cmd)
208 {
209         local_irq_disable();
210         if (rstcr)
211                 /* set reset control register */
212                 out_be32(rstcr, 0x2);   /* HRESET_REQ */
213 
214         while (1) ;
215 }
216 #endif
217 
218 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
219 struct platform_diu_data_ops diu_ops;
220 EXPORT_SYMBOL(diu_ops);
221 #endif
222 
223 #ifdef CONFIG_EPAPR_PARAVIRT
224 /*
225  * Restart the current partition
226  *
227  * This function should be assigned to the ppc_md.restart function pointer,
228  * to initiate a partition restart when we're running under the Freescale
229  * hypervisor.
230  */
231 void fsl_hv_restart(char *cmd)
232 {
233         pr_info("hv restart\n");
234         fh_partition_restart(-1);
235 }
236 
237 /*
238  * Halt the current partition
239  *
240  * This function should be assigned to the pm_power_off and ppc_md.halt
241  * function pointers, to shut down the partition when we're running under
242  * the Freescale hypervisor.
243  */
244 void fsl_hv_halt(void)
245 {
246         pr_info("hv exit\n");
247         fh_partition_stop(-1);
248 }
249 #endif
250 

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