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/of_platform.h>
  23 #include <linux/phy.h>
  24 #include <linux/spi/spi.h>
  25 #include <linux/fsl_devices.h>
  26 #include <linux/fs_enet_pd.h>
  27 #include <linux/fs_uart_pd.h>
  28 #include <linux/reboot.h>
  29
  30 #include <linux/atomic.h>
  31 #include <asm/io.h>
  32 #include <asm/irq.h>
  33 #include <asm/time.h>
  34 #include <asm/prom.h>
  35 #include <asm/machdep.h>
  36 #include <sysdev/fsl_soc.h>
  37 #include <mm/mmu_decl.h>
  38 #include <asm/cpm2.h>
  39 #include <asm/fsl_hcalls.h>     /* For the Freescale hypervisor */
  40
  41 extern void init_fcc_ioports(struct fs_platform_info*);
  42 extern void init_fec_ioports(struct fs_platform_info*);
  43 extern void init_smc_ioports(struct fs_uart_platform_info*);
  44 static phys_addr_t immrbase = -1;
  45
  46 phys_addr_t get_immrbase(void)
  47 {
  48         struct device_node *soc;
  49
  50         if (immrbase != -1)
  51                 return immrbase;
  52
  53         soc = of_find_node_by_type(NULL, "soc");
  54         if (soc) {
  55                 int size;
  56                 u32 naddr;
  57                 const __be32 *prop = of_get_property(soc, "#address-cells", &size);
  58
  59                 if (prop && size == 4)
  60                         naddr = be32_to_cpup(prop);
  61                 else
  62                         naddr = 2;
  63
  64                 prop = of_get_property(soc, "ranges", &size);
  65                 if (prop)
  66                         immrbase = of_translate_address(soc, prop + naddr);
  67
  68                 of_node_put(soc);
  69         }
  70
  71         return immrbase;
  72 }
  73
  74 EXPORT_SYMBOL(get_immrbase);
  75
  76 u32 fsl_get_sys_freq(void)
  77 {
  78         static u32 sysfreq = -1;
  79         struct device_node *soc;
  80
  81         if (sysfreq != -1)
  82                 return sysfreq;
  83
  84         soc = of_find_node_by_type(NULL, "soc");
  85         if (!soc)
  86                 return -1;
  87
  88         of_property_read_u32(soc, "clock-frequency", &sysfreq);
  89         if (sysfreq == -1 || !sysfreq)
  90                 of_property_read_u32(soc, "bus-frequency", &sysfreq);
  91
  92         of_node_put(soc);
  93         return sysfreq;
  94 }
  95 EXPORT_SYMBOL(fsl_get_sys_freq);
  96
  97 #if defined(CONFIG_CPM) || defined(CONFIG_QUICC_ENGINE)
  98
  99 u32 get_brgfreq(void)
 100 {
 101         static u32 brgfreq = -1;
 102         struct device_node *node;
 103
 104         if (brgfreq != -1)
 105                 return brgfreq;
 106
 107         node = of_find_compatible_node(NULL, NULL, "fsl,cpm-brg");
 108         if (node) {
 109                 of_property_read_u32(node, "clock-frequency", &brgfreq);
 110                 of_node_put(node);
 111                 return brgfreq;
 112         }
 113
 114         /* Legacy device binding -- will go away when no users are left. */
 115         node = of_find_node_by_type(NULL, "cpm");
 116         if (!node)
 117                 node = of_find_compatible_node(NULL, NULL, "fsl,qe");
 118         if (!node)
 119                 node = of_find_node_by_type(NULL, "qe");
 120
 121         if (node) {
 122                 of_property_read_u32(node, "brg-frequency", &brgfreq);
 123                 if (brgfreq == -1 || !brgfreq)
 124                         if (!of_property_read_u32(node, "bus-frequency",
 125                                                   &brgfreq))
 126                                 brgfreq /= 2;
 127                 of_node_put(node);
 128         }
 129
 130         return brgfreq;
 131 }
 132
 133 EXPORT_SYMBOL(get_brgfreq);
 134
 135 u32 get_baudrate(void)
 136 {
 137         static u32 fs_baudrate = -1;
 138         struct device_node *node;
 139
 140         if (fs_baudrate != -1)
 141                 return fs_baudrate;
 142
 143         node = of_find_node_by_type(NULL, "serial");
 144         if (node) {
 145                 of_property_read_u32(node, "current-speed", &fs_baudrate);
 146                 of_node_put(node);
 147         }
 148
 149         return fs_baudrate;
 150 }
 151
 152 EXPORT_SYMBOL(get_baudrate);
 153 #endif /* CONFIG_CPM2 */
 154
 155 #if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
 156 static __be32 __iomem *rstcr;
 157
 158 static int fsl_rstcr_restart(struct notifier_block *this,
 159                              unsigned long mode, void *cmd)
 160 {
 161         local_irq_disable();
 162         /* set reset control register */
 163         out_be32(rstcr, 0x2);   /* HRESET_REQ */
 164
 165         return NOTIFY_DONE;
 166 }
 167
 168 static int __init setup_rstcr(void)
 169 {
 170         struct device_node *np;
 171
 172         static struct notifier_block restart_handler = {
 173                 .notifier_call = fsl_rstcr_restart,
 174                 .priority = 128,
 175         };
 176
 177         for_each_node_by_name(np, "global-utilities") {
 178                 if ((of_get_property(np, "fsl,has-rstcr", NULL))) {
 179                         rstcr = of_iomap(np, 0) + 0xb0;
 180                         if (!rstcr) {
 181                                 printk (KERN_ERR "Error: reset control "
 182                                                 "register not mapped!\n");
 183                         } else {
 184                                 register_restart_handler(&restart_handler);
 185                         }
 186                         break;
 187                 }
 188         }
 189
 190         of_node_put(np);
 191
 192         return 0;
 193 }
 194
 195 arch_initcall(setup_rstcr);
 196
 197 #endif
 198
 199 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
 200 struct platform_diu_data_ops diu_ops;
 201 EXPORT_SYMBOL(diu_ops);
 202 #endif
 203
 204 #ifdef CONFIG_EPAPR_PARAVIRT
 205 /*
 206  * Restart the current partition
 207  *
 208  * This function should be assigned to the ppc_md.restart function pointer,
 209  * to initiate a partition restart when we're running under the Freescale
 210  * hypervisor.
 211  */
 212 void __noreturn fsl_hv_restart(char *cmd)
 213 {
 214         pr_info("hv restart\n");
 215         fh_partition_restart(-1);
 216         while (1) ;
 217 }
 218
 219 /*
 220  * Halt the current partition
 221  *
 222  * This function should be assigned to the pm_power_off and ppc_md.halt
 223  * function pointers, to shut down the partition when we're running under
 224  * the Freescale hypervisor.
 225  */
 226 void __noreturn fsl_hv_halt(void)
 227 {
 228         pr_info("hv exit\n");
 229         fh_partition_stop(-1);
 230         while (1) ;
 231 }
 232 #endif