arch/sparc/kernel/leon_kernel.c

   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         of_pdt_build_more = &leon_node_init;
 286 }