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 218