arch/powerpc/sysdev/fsl_soc.c

   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