arch/powerpc/sysdev/fsl_soc.c

   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 #include <linux/reboot.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 u32 fsl_get_sys_freq(void)
  81 {
  82         static u32 sysfreq = -1;
  83         struct device_node *soc;
  84
  85         if (sysfreq != -1)
  86                 return sysfreq;
  87
  88         soc = of_find_node_by_type(NULL, "soc");
  89         if (!soc)
  90                 return -1;
  91
  92         of_property_read_u32(soc, "clock-frequency", &sysfreq);
  93         if (sysfreq == -1 || !sysfreq)
  94                 of_property_read_u32(soc, "bus-frequency", &sysfreq);
  95
  96         of_node_put(soc);
  97         return sysfreq;
  98 }
  99 EXPORT_SYMBOL(fsl_get_sys_freq);
 100
 101 #if defined(CONFIG_CPM2) || defined(CONFIG_QUICC_ENGINE) || defined(CONFIG_8xx)
 102
 103 u32 get_brgfreq(void)
 104 {
 105         static u32 brgfreq = -1;
 106         struct device_node *node;
 107
 108         if (brgfreq != -1)
 109                 return brgfreq;
 110
 111         node = of_find_compatible_node(NULL, NULL, "fsl,cpm-brg");
 112         if (node) {
 113                 of_property_read_u32(node, "clock-frequency", &brgfreq);
 114                 of_node_put(node);
 115                 return brgfreq;
 116         }
 117
 118         /* Legacy device binding -- will go away when no users are left. */
 119         node = of_find_node_by_type(NULL, "cpm");
 120         if (!node)
 121                 node = of_find_compatible_node(NULL, NULL, "fsl,qe");
 122         if (!node)
 123                 node = of_find_node_by_type(NULL, "qe");
 124
 125         if (node) {
 126                 of_property_read_u32(node, "brg-frequency", &brgfreq);
 127                 if (brgfreq == -1 || !brgfreq)
 128                         if (!of_property_read_u32(node, "bus-frequency",
 129                                                   &brgfreq))
 130                                 brgfreq /= 2;
 131                 of_node_put(node);
 132         }
 133
 134         return brgfreq;
 135 }
 136
 137 EXPORT_SYMBOL(get_brgfreq);
 138
 139 u32 get_baudrate(void)
 140 {
 141         static u32 fs_baudrate = -1;
 142         struct device_node *node;
 143
 144         if (fs_baudrate != -1)
 145                 return fs_baudrate;
 146
 147         node = of_find_node_by_type(NULL, "serial");
 148         if (node) {
 149                 of_property_read_u32(node, "current-speed", &fs_baudrate);
 150                 of_node_put(node);
 151         }
 152
 153         return fs_baudrate;
 154 }
 155
 156 EXPORT_SYMBOL(get_baudrate);
 157 #endif /* CONFIG_CPM2 */
 158
 159 #if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
 160 static __be32 __iomem *rstcr;
 161
 162 static int fsl_rstcr_restart(struct notifier_block *this,
 163                              unsigned long mode, void *cmd)
 164 {
 165         local_irq_disable();
 166         /* set reset control register */
 167         out_be32(rstcr, 0x2);   /* HRESET_REQ */
 168
 169         return NOTIFY_DONE;
 170 }
 171
 172 static int __init setup_rstcr(void)
 173 {
 174         struct device_node *np;
 175
 176         static struct notifier_block restart_handler = {
 177                 .notifier_call = fsl_rstcr_restart,
 178                 .priority = 128,
 179         };
 180
 181         for_each_node_by_name(np, "global-utilities") {
 182                 if ((of_get_property(np, "fsl,has-rstcr", NULL))) {
 183                         rstcr = of_iomap(np, 0) + 0xb0;
 184                         if (!rstcr) {
 185                                 printk (KERN_ERR "Error: reset control "
 186                                                 "register not mapped!\n");
 187                         } else {
 188                                 register_restart_handler(&restart_handler);
 189                         }
 190                         break;
 191                 }
 192         }
 193
 194         of_node_put(np);
 195
 196         return 0;
 197 }
 198
 199 arch_initcall(setup_rstcr);
 200
 201 #endif
 202
 203 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
 204 struct platform_diu_data_ops diu_ops;
 205 EXPORT_SYMBOL(diu_ops);
 206 #endif
 207
 208 #ifdef CONFIG_EPAPR_PARAVIRT
 209 /*
 210  * Restart the current partition
 211  *
 212  * This function should be assigned to the ppc_md.restart function pointer,
 213  * to initiate a partition restart when we're running under the Freescale
 214  * hypervisor.
 215  */
 216 void __noreturn fsl_hv_restart(char *cmd)
 217 {
 218         pr_info("hv restart\n");
 219         fh_partition_restart(-1);
 220         while (1) ;
 221 }
 222
 223 /*
 224  * Halt the current partition
 225  *
 226  * This function should be assigned to the pm_power_off and ppc_md.halt
 227  * function pointers, to shut down the partition when we're running under
 228  * the Freescale hypervisor.
 229  */
 230 void __noreturn fsl_hv_halt(void)
 231 {
 232         pr_info("hv exit\n");
 233         fh_partition_stop(-1);
 234         while (1) ;
 235 }
 236 #endif