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/slab.h> 11 #include <linux/of.h> 12 #include <linux/of_platform.h> 13 #include <linux/interrupt.h> 14 #include <linux/of_device.h> 15 16 #include <asm/oplib.h> 17 #include <asm/timer.h> 18 #include <asm/prom.h> 19 #include <asm/leon.h> 20 #include <asm/leon_amba.h> 21 #include <asm/traps.h> 22 #include <asm/cacheflush.h> 23 24 #include "prom.h" 25 #include "irq.h" 26 27 struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address, initialized by amba_init() */ 28 struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address, initialized by amba_init() */ 29 struct amba_apb_device leon_percpu_timer_dev[16]; 30 31 int leondebug_irq_disable; 32 int leon_debug_irqout; 33 static int dummy_master_l10_counter; 34 35 unsigned long leon3_gptimer_irq; /* interrupt controller irq number, initialized by amba_init() */ 36 unsigned int sparc_leon_eirq; 37 #define LEON_IMASK ((&leon3_irqctrl_regs->mask[0])) 38 39 /* Return the IRQ of the pending IRQ on the extended IRQ controller */ 40 int sparc_leon_eirq_get(int eirq, int cpu) 41 { 42 return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f; 43 } 44 45 irqreturn_t sparc_leon_eirq_isr(int dummy, void *dev_id) 46 { 47 printk(KERN_ERR "sparc_leon_eirq_isr: ERROR EXTENDED IRQ\n"); 48 return IRQ_HANDLED; 49 } 50 51 /* The extended IRQ controller has been found, this function registers it */ 52 void sparc_leon_eirq_register(int eirq) 53 { 54 int irq; 55 56 /* Register a "BAD" handler for this interrupt, it should never happen */ 57 irq = request_irq(eirq, sparc_leon_eirq_isr, 58 (IRQF_DISABLED | SA_STATIC_ALLOC), "extirq", NULL); 59 60 if (irq) { 61 printk(KERN_ERR 62 "sparc_leon_eirq_register: unable to attach IRQ%d\n", 63 eirq); 64 } else { 65 sparc_leon_eirq = eirq; 66 } 67 68 } 69 70 static inline unsigned long get_irqmask(unsigned int irq) 71 { 72 unsigned long mask; 73 74 if (!irq || ((irq > 0xf) && !sparc_leon_eirq) 75 || ((irq > 0x1f) && sparc_leon_eirq)) { 76 printk(KERN_ERR 77 "leon_get_irqmask: false irq number: %d\n", irq); 78 mask = 0; 79 } else { 80 mask = LEON_HARD_INT(irq); 81 } 82 return mask; 83 } 84 85 static void leon_enable_irq(unsigned int irq_nr) 86 { 87 unsigned long mask, flags; 88 mask = get_irqmask(irq_nr); 89 local_irq_save(flags); 90 LEON3_BYPASS_STORE_PA(LEON_IMASK, 91 (LEON3_BYPASS_LOAD_PA(LEON_IMASK) | (mask))); 92 local_irq_restore(flags); 93 } 94 95 static void leon_disable_irq(unsigned int irq_nr) 96 { 97 unsigned long mask, flags; 98 mask = get_irqmask(irq_nr); 99 local_irq_save(flags); 100 LEON3_BYPASS_STORE_PA(LEON_IMASK, 101 (LEON3_BYPASS_LOAD_PA(LEON_IMASK) & ~(mask))); 102 local_irq_restore(flags); 103 104 } 105 106 void __init leon_init_timers(irq_handler_t counter_fn) 107 { 108 int irq; 109 110 leondebug_irq_disable = 0; 111 leon_debug_irqout = 0; 112 master_l10_counter = (unsigned int *)&dummy_master_l10_counter; 113 dummy_master_l10_counter = 0; 114 115 if (leon3_gptimer_regs && leon3_irqctrl_regs) { 116 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].val, 0); 117 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].rld, 118 (((1000000 / 100) - 1))); 119 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl, 0); 120 121 #ifdef CONFIG_SMP 122 leon_percpu_timer_dev[0].start = (int)leon3_gptimer_regs; 123 leon_percpu_timer_dev[0].irq = leon3_gptimer_irq+1; 124 125 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) & 126 (1<<LEON3_GPTIMER_SEPIRQ))) { 127 prom_printf("irq timer not configured with seperate irqs \n"); 128 BUG(); 129 } 130 131 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].val, 0); 132 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].rld, (((1000000/100) - 1))); 133 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl, 0); 134 # endif 135 136 } else { 137 printk(KERN_ERR "No Timer/irqctrl found\n"); 138 BUG(); 139 } 140 141 irq = request_irq(leon3_gptimer_irq, 142 counter_fn, 143 (IRQF_DISABLED | SA_STATIC_ALLOC), "timer", NULL); 144 145 if (irq) { 146 printk(KERN_ERR "leon_time_init: unable to attach IRQ%d\n", 147 LEON_INTERRUPT_TIMER1); 148 prom_halt(); 149 } 150 151 # ifdef CONFIG_SMP 152 { 153 unsigned long flags; 154 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_percpu_timer_dev[0].irq - 1)]; 155 156 /* For SMP we use the level 14 ticker, however the bootup code 157 * has copied the firmwares level 14 vector into boot cpu's 158 * trap table, we must fix this now or we get squashed. 159 */ 160 local_irq_save(flags); 161 162 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */ 163 164 /* Adjust so that we jump directly to smpleon_ticker */ 165 trap_table->inst_three += smpleon_ticker - real_irq_entry; 166 167 local_flush_cache_all(); 168 local_irq_restore(flags); 169 } 170 # endif 171 172 if (leon3_gptimer_regs) { 173 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl, 174 LEON3_GPTIMER_EN | 175 LEON3_GPTIMER_RL | 176 LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN); 177 178 #ifdef CONFIG_SMP 179 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl, 180 LEON3_GPTIMER_EN | 181 LEON3_GPTIMER_RL | 182 LEON3_GPTIMER_LD | 183 LEON3_GPTIMER_IRQEN); 184 #endif 185 186 } 187 } 188 189 void leon_clear_clock_irq(void) 190 { 191 } 192 193 void leon_load_profile_irq(int cpu, unsigned int limit) 194 { 195 BUG(); 196 } 197 198 199 200 201 void __init leon_trans_init(struct device_node *dp) 202 { 203 if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) { 204 struct property *p; 205 p = of_find_property(dp, "mid", (void *)0); 206 if (p) { 207 int mid; 208 dp->name = prom_early_alloc(5 + 1); 209 memcpy(&mid, p->value, p->length); 210 sprintf((char *)dp->name, "cpu%.2d", mid); 211 } 212 } 213 } 214 215 void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0; 216 217 void __init leon_node_init(struct device_node *dp, struct device_node ***nextp) 218 { 219 if (prom_amba_init && 220 strcmp(dp->type, "ambapp") == 0 && 221 strcmp(dp->name, "ambapp0") == 0) { 222 prom_amba_init(dp, nextp); 223 } 224 } 225 226 #ifdef CONFIG_SMP 227 228 void leon_set_cpu_int(int cpu, int level) 229 { 230 unsigned long mask; 231 mask = get_irqmask(level); 232 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask); 233 } 234 235 static void leon_clear_ipi(int cpu, int level) 236 { 237 unsigned long mask; 238 mask = get_irqmask(level); 239 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16); 240 } 241 242 static void leon_set_udt(int cpu) 243 { 244 } 245 246 void leon_clear_profile_irq(int cpu) 247 { 248 } 249 250 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu) 251 { 252 unsigned long mask, flags, *addr; 253 mask = get_irqmask(irq_nr); 254 local_irq_save(flags); 255 addr = (unsigned long *)&(leon3_irqctrl_regs->mask[cpu]); 256 LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | (mask))); 257 local_irq_restore(flags); 258 } 259 260 #endif 261 262 void __init leon_init_IRQ(void) 263 { 264 sparc_init_timers = leon_init_timers; 265 266 BTFIXUPSET_CALL(enable_irq, leon_enable_irq, BTFIXUPCALL_NORM); 267 BTFIXUPSET_CALL(disable_irq, leon_disable_irq, BTFIXUPCALL_NORM); 268 BTFIXUPSET_CALL(enable_pil_irq, leon_enable_irq, BTFIXUPCALL_NORM); 269 BTFIXUPSET_CALL(disable_pil_irq, leon_disable_irq, BTFIXUPCALL_NORM); 270 271 BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq, 272 BTFIXUPCALL_NORM); 273 BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq, 274 BTFIXUPCALL_NOP); 275 276 #ifdef CONFIG_SMP 277 BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM); 278 BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM); 279 BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM); 280 #endif 281 282 } 283 284 void __init leon_init(void) 285 { 286 prom_build_more = &leon_node_init; 287 } 288