1 /* 2 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB 3 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/module.h> 8 #include <linux/errno.h> 9 #include <linux/mutex.h> 10 #include <linux/of.h> 11 #include <linux/of_platform.h> 12 #include <linux/interrupt.h> 13 #include <linux/of_device.h> 14 15 #include <asm/oplib.h> 16 #include <asm/timer.h> 17 #include <asm/prom.h> 18 #include <asm/leon.h> 19 #include <asm/leon_amba.h> 20 #include <asm/traps.h> 21 #include <asm/cacheflush.h> 22 23 #include "prom.h" 24 #include "irq.h" 25 26 struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address, initialized by amba_init() */ 27 struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address, initialized by amba_init() */ 28 struct amba_apb_device leon_percpu_timer_dev[16]; 29 30 int leondebug_irq_disable; 31 int leon_debug_irqout; 32 static int dummy_master_l10_counter; 33 34 unsigned long leon3_gptimer_irq; /* interrupt controller irq number, initialized by amba_init() */ 35 unsigned int sparc_leon_eirq; 36 #define LEON_IMASK ((&leon3_irqctrl_regs->mask[0])) 37 38 /* Return the IRQ of the pending IRQ on the extended IRQ controller */ 39 int sparc_leon_eirq_get(int eirq, int cpu) 40 { 41 return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f; 42 } 43 44 irqreturn_t sparc_leon_eirq_isr(int dummy, void *dev_id) 45 { 46 printk(KERN_ERR "sparc_leon_eirq_isr: ERROR EXTENDED IRQ\n"); 47 return IRQ_HANDLED; 48 } 49 50 /* The extended IRQ controller has been found, this function registers it */ 51 void sparc_leon_eirq_register(int eirq) 52 { 53 int irq; 54 55 /* Register a "BAD" handler for this interrupt, it should never happen */ 56 irq = request_irq(eirq, sparc_leon_eirq_isr, 57 (IRQF_DISABLED | SA_STATIC_ALLOC), "extirq", NULL); 58 59 if (irq) { 60 printk(KERN_ERR 61 "sparc_leon_eirq_register: unable to attach IRQ%d\n", 62 eirq); 63 } else { 64 sparc_leon_eirq = eirq; 65 } 66 67 } 68 69 static inline unsigned long get_irqmask(unsigned int irq) 70 { 71 unsigned long mask; 72 73 if (!irq || ((irq > 0xf) && !sparc_leon_eirq) 74 || ((irq > 0x1f) && sparc_leon_eirq)) { 75 printk(KERN_ERR 76 "leon_get_irqmask: false irq number: %d\n", irq); 77 mask = 0; 78 } else { 79 mask = LEON_HARD_INT(irq); 80 } 81 return mask; 82 } 83 84 static void leon_enable_irq(unsigned int irq_nr) 85 { 86 unsigned long mask, flags; 87 mask = get_irqmask(irq_nr); 88 local_irq_save(flags); 89 LEON3_BYPASS_STORE_PA(LEON_IMASK, 90 (LEON3_BYPASS_LOAD_PA(LEON_IMASK) | (mask))); 91 local_irq_restore(flags); 92 } 93 94 static void leon_disable_irq(unsigned int irq_nr) 95 { 96 unsigned long mask, flags; 97 mask = get_irqmask(irq_nr); 98 local_irq_save(flags); 99 LEON3_BYPASS_STORE_PA(LEON_IMASK, 100 (LEON3_BYPASS_LOAD_PA(LEON_IMASK) & ~(mask))); 101 local_irq_restore(flags); 102 103 } 104 105 void __init leon_init_timers(irq_handler_t counter_fn) 106 { 107 int irq; 108 109 leondebug_irq_disable = 0; 110 leon_debug_irqout = 0; 111 master_l10_counter = (unsigned int *)&dummy_master_l10_counter; 112 dummy_master_l10_counter = 0; 113 114 if (leon3_gptimer_regs && leon3_irqctrl_regs) { 115 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].val, 0); 116 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].rld, 117 (((1000000 / 100) - 1))); 118 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl, 0); 119 120 #ifdef CONFIG_SMP 121 leon_percpu_timer_dev[0].start = (int)leon3_gptimer_regs; 122 leon_percpu_timer_dev[0].irq = leon3_gptimer_irq+1; 123 124 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) & 125 (1<<LEON3_GPTIMER_SEPIRQ))) { 126 prom_printf("irq timer not configured with separate irqs\n"); 127 BUG(); 128 } 129 130 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].val, 0); 131 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].rld, (((1000000/100) - 1))); 132 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl, 0); 133 # endif 134 135 } else { 136 printk(KERN_ERR "No Timer/irqctrl found\n"); 137 BUG(); 138 } 139 140 irq = request_irq(leon3_gptimer_irq, 141 counter_fn, 142 (IRQF_DISABLED | SA_STATIC_ALLOC), "timer", NULL); 143 144 if (irq) { 145 printk(KERN_ERR "leon_time_init: unable to attach IRQ%d\n", 146 LEON_INTERRUPT_TIMER1); 147 prom_halt(); 148 } 149 150 # ifdef CONFIG_SMP 151 { 152 unsigned long flags; 153 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_percpu_timer_dev[0].irq - 1)]; 154 155 /* For SMP we use the level 14 ticker, however the bootup code 156 * has copied the firmwares level 14 vector into boot cpu's 157 * trap table, we must fix this now or we get squashed. 158 */ 159 local_irq_save(flags); 160 161 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */ 162 163 /* Adjust so that we jump directly to smpleon_ticker */ 164 trap_table->inst_three += smpleon_ticker - real_irq_entry; 165 166 local_flush_cache_all(); 167 local_irq_restore(flags); 168 } 169 # endif 170 171 if (leon3_gptimer_regs) { 172 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl, 173 LEON3_GPTIMER_EN | 174 LEON3_GPTIMER_RL | 175 LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN); 176 177 #ifdef CONFIG_SMP 178 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl, 179 LEON3_GPTIMER_EN | 180 LEON3_GPTIMER_RL | 181 LEON3_GPTIMER_LD | 182 LEON3_GPTIMER_IRQEN); 183 #endif 184 185 } 186 } 187 188 void leon_clear_clock_irq(void) 189 { 190 } 191 192 void leon_load_profile_irq(int cpu, unsigned int limit) 193 { 194 BUG(); 195 } 196 197 198 199 200 void __init leon_trans_init(struct device_node *dp) 201 { 202 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) { 203 struct property *p; 204 p = of_find_property(dp, "mid", (void *)0); 205 if (p) { 206 int mid; 207 dp->name = prom_early_alloc(5 + 1); 208 memcpy(&mid, p->value, p->length); 209 sprintf((char *)dp->name, "cpu%.2d", mid); 210 } 211 } 212 } 213 214 void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0; 215 216 void __init leon_node_init(struct device_node *dp, struct device_node ***nextp) 217 { 218 if (prom_amba_init && 219 strcmp(dp->type, "ambapp") == 0 && 220 strcmp(dp->name, "ambapp0") == 0) { 221 prom_amba_init(dp, nextp); 222 } 223 } 224 225 #ifdef CONFIG_SMP 226 227 void leon_set_cpu_int(int cpu, int level) 228 { 229 unsigned long mask; 230 mask = get_irqmask(level); 231 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask); 232 } 233 234 static void leon_clear_ipi(int cpu, int level) 235 { 236 unsigned long mask; 237 mask = get_irqmask(level); 238 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16); 239 } 240 241 static void leon_set_udt(int cpu) 242 { 243 } 244 245 void leon_clear_profile_irq(int cpu) 246 { 247 } 248 249 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu) 250 { 251 unsigned long mask, flags, *addr; 252 mask = get_irqmask(irq_nr); 253 local_irq_save(flags); 254 addr = (unsigned long *)&(leon3_irqctrl_regs->mask[cpu]); 255 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | (mask))); 256 local_irq_restore(flags); 257 } 258 259 #endif 260 261 void __init leon_init_IRQ(void) 262 { 263 sparc_init_timers = leon_init_timers; 264 265 BTFIXUPSET_CALL(enable_irq, leon_enable_irq, BTFIXUPCALL_NORM); 266 BTFIXUPSET_CALL(disable_irq, leon_disable_irq, BTFIXUPCALL_NORM); 267 BTFIXUPSET_CALL(enable_pil_irq, leon_enable_irq, BTFIXUPCALL_NORM); 268 BTFIXUPSET_CALL(disable_pil_irq, leon_disable_irq, BTFIXUPCALL_NORM); 269 270 BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq, 271 BTFIXUPCALL_NORM); 272 BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq, 273 BTFIXUPCALL_NOP); 274 275 #ifdef CONFIG_SMP 276 BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM); 277 BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM); 278 BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM); 279 #endif 280 281 } 282 283 void __init leon_init(void) 284 { 285 prom_build_more = &leon_node_init; 286 } 287