arch/arm-native/kernel/platform_bcm2708.c

   1 /*
   2     Copyright © 2015, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <aros/kernel.h>
   7 #include <aros/symbolsets.h>
   8
   9 #include "kernel_base.h"
  10
  11 #include <proto/kernel.h>
  12 #include <proto/exec.h>
  13
  14 #include <inttypes.h>
  15 #include <hardware/intbits.h>
  16
  17 #include <strings.h>
  18
  19 #include "kernel_intern.h"
  20 #include "kernel_debug.h"
  21 #include "kernel_cpu.h"
  22 #include "kernel_interrupts.h"
  23 #include "kernel_intr.h"
  24 #include "kernel_fb.h"
  25
  26 #include "exec_platform.h"
  27
  28 #define ARM_PERIIOBASE __arm_arosintern.ARMI_PeripheralBase
  29 #include <hardware/bcm2708.h>
  30 #include <hardware/bcm2708_boot.h>
  31 #include <hardware/pl011uart.h>
  32
  33 #define IRQBANK_POINTER(bank)   ((bank == 0) ? GPUIRQ_ENBL0 : (bank == 1) ? GPUIRQ_ENBL1 : ARMIRQ_ENBL)
  34
  35 #define IRQ_BANK1       0x00000100
  36 #define IRQ_BANK2       0x00000200
  37
  38 #define D(x) x
  39 #define DIRQ(x)
  40 #define DFIQ(x)
  41 #define DTIMER(x)
  42
  43 extern void mpcore_trampoline();
  44 extern uint32_t mpcore_end;
  45 extern uint32_t mpcore_pde;
  46
  47 extern void cpu_Register(void);
  48 extern void arm_flush_cache(uint32_t addr, uint32_t length);
  49
  50 static void bcm2708_init(APTR _kernelBase, APTR _sysBase)
  51 {
  52     struct ExecBase *SysBase = (struct ExecBase *)_sysBase;
  53     struct KernelBase *KernelBase = (struct KernelBase *)_kernelBase;
  54
  55     D(bug("[KRN:BCM2708] %s()\n", __PRETTY_FUNCTION__));
  56
  57     if (__arm_arosintern.ARMI_PeripheralBase == (APTR)BCM2836_PERIPHYSBASE)
  58     {
  59         void *trampoline_src = mpcore_trampoline;
  60         void *trampoline_dst = (void *)BOOTMEMADDR(bm_mctrampoline);
  61         uint32_t trampoline_length = (uintptr_t)&mpcore_end - (uintptr_t)mpcore_trampoline;
  62         uint32_t trampoline_data_offset = (uintptr_t)&mpcore_pde - (uintptr_t)mpcore_trampoline;
  63         int core;
  64         uint32_t *core_stack;
  65         uint32_t tmp;
  66         tls_t   *__tls;
  67
  68         bug("[KRN:BCM2708] Initialising Multicore System\n");
  69         D(bug("[KRN:BCM2708] %s: Copy SMP trampoline from %p to %p (%d bytes)\n", __PRETTY_FUNCTION__, trampoline_src, trampoline_dst, trampoline_length));
  70
  71         bcopy(trampoline_src, trampoline_dst, trampoline_length);
  72
  73         D(bug("[KRN:BCM2708] %s: Patching data for trampoline at offset %d\n", __PRETTY_FUNCTION__, trampoline_data_offset));
  74
  75         asm volatile ("mrc p15, 0, %0, c2, c0, 0":"=r"(tmp));
  76         ((uint32_t *)(trampoline_dst + trampoline_data_offset))[0] = tmp; // pde
  77         ((uint32_t *)(trampoline_dst + trampoline_data_offset))[1] = (uint32_t)cpu_Register;
  78
  79         for (core = 1; core < 4; core ++)
  80         {
  81                 core_stack = (uint32_t *)AllocMem(AROS_STACKSIZE*sizeof(uint32_t), MEMF_CLEAR); /* MEMF_PRIVATE */
  82                 ((uint32_t *)(trampoline_dst + trampoline_data_offset))[2] = (uint32_t)&core_stack[AROS_STACKSIZE-sizeof(IPTR)];
  83
  84                 __tls =  AllocMem(sizeof(tls_t),  MEMF_CLEAR); /* MEMF_PRIVATE */
  85                 __tls->SysBase = _sysBase;
  86                 __tls->KernelBase = _kernelBase;
  87                 __tls->ThisTask = NULL;
  88                 arm_flush_cache(((uint32_t)__tls) & ~63, 512);
  89                 ((uint32_t *)(trampoline_dst + trampoline_data_offset))[3] = __tls;
  90
  91                 D(bug("[KRN:BCM2708] %s: Attempting to wake core #%d\n", __PRETTY_FUNCTION__, core));
  92                 D(bug("[KRN:BCM2708] %s: core #%d stack @ 0x%p (sp=0x%p)\n", __PRETTY_FUNCTION__, core, core_stack, ((uint32_t *)(trampoline_dst + trampoline_data_offset))[2]));
  93                 D(bug("[KRN:BCM2708] %s: core #%d tls @ 0x%p\n", __PRETTY_FUNCTION__, core, ((uint32_t *)(trampoline_dst + trampoline_data_offset))[3]));
  94
  95                 arm_flush_cache((uint32_t)trampoline_dst, 512);
  96                 *((uint32_t *)(BCM2836_MAILBOX3_SET0 + (0x10 * core))) = (uint32_t)trampoline_dst;
  97
  98                 if (__arm_arosintern.ARMI_Delay)
  99                     __arm_arosintern.ARMI_Delay(10000000);
 100         }
 101     }
 102 }
 103
 104 static void bcm2708_init_core(APTR _kernelBase, APTR _sysBase)
 105 {
 106     struct ExecBase *SysBase = (struct ExecBase *)_sysBase;
 107     struct KernelBase *KernelBase = (struct KernelBase *)_kernelBase;
 108     uint32_t tmp;
 109
 110     D(bug("[KRN:BCM2708] %s()\n", __PRETTY_FUNCTION__));
 111
 112     asm volatile (" mrc p15, 0, %0, c0, c0, 5 " : "=r" (tmp));
 113
 114     // enable FIQ mailbox interupt
 115     *((uint32_t *)(BCM2836_MAILBOX_INT_CTRL0 + (0x4 * (tmp & 0x3)))) = (1 << 3);
 116 }
 117
 118 static unsigned int bcm2807_get_time(void)
 119 {
 120     return *((volatile unsigned int *)(SYSTIMER_CLO));
 121 }
 122
 123 static void bcm2807_irq_init(void)
 124 {
 125     // disable IRQ's
 126 //    *(volatile unsigned int *)ARMFIQ_CTRL = 0;
 127
 128     *(volatile unsigned int *)ARMIRQ_DIBL = ~0;
 129     *(volatile unsigned int *)GPUIRQ_DIBL0 = ~0;
 130     *(volatile unsigned int *)GPUIRQ_DIBL1 = ~0;
 131
 132     // aknowledge pending IRQ's
 133     *(volatile unsigned int *)ARMIRQ_PEND = *(volatile unsigned int *)ARMIRQ_PEND;
 134     *(volatile unsigned int *)GPUIRQ_PEND0 = *(volatile unsigned int *)GPUIRQ_PEND0;
 135     *(volatile unsigned int *)GPUIRQ_PEND1 = *(volatile unsigned int *)GPUIRQ_PEND1;
 136 }
 137
 138 static void bcm2807_irq_enable(int irq)
 139 {
 140     int bank = IRQ_BANK(irq);
 141     unsigned int reg;
 142
 143     reg = (unsigned int)IRQBANK_POINTER(bank);
 144
 145     DIRQ(bug("[KRN:BCM2708] Enabling irq %d [bank %d, reg 0x%p]\n", irq, bank, reg));
 146
 147     *((volatile unsigned int *)reg) = IRQ_MASK(irq);
 148
 149     DIRQ(bug("[KRN:BCM2708] irqmask=%08x\n", *((volatile unsigned int *)reg)));
 150 }
 151
 152 static void bcm2807_irq_disable(int irq)
 153 {
 154     int bank = IRQ_BANK(irq);
 155     unsigned int reg;
 156
 157     reg = (unsigned int)IRQBANK_POINTER(bank) + 0x0c;
 158
 159     DIRQ(bug("[KRN:BCM2708] Disabling irq %d [bank %d, reg 0x%p]\n", irq, bank, reg));
 160
 161     *((volatile unsigned int *)reg) = IRQ_MASK(irq);
 162
 163     DIRQ(bug("[KRN:BCM2708] irqmask=%08x\n", *((volatile unsigned int *)reg)));
 164 }
 165
 166 static void bcm2807_irq_process()
 167 {
 168     unsigned int pendingarm, pending0, pending1, irq;
 169
 170     for(;;)
 171     {
 172         pendingarm = *((volatile unsigned int *)(ARMIRQ_PEND));
 173         pending0 = *((volatile unsigned int *)(GPUIRQ_PEND0));
 174         pending1 = *((volatile unsigned int *)(GPUIRQ_PEND1));
 175
 176         if (!(pendingarm || pending0 || pending1))
 177             break;
 178
 179         DIRQ(bug("[KRN:BCM2708] PendingARM %08x\n", pendingarm));
 180         DIRQ(bug("[KRN:BCM2708] Pending0 %08x\n", pending0));
 181         DIRQ(bug("[KRN:BCM2708] Pending1 %08x\n", pending1));
 182
 183         if (pendingarm & ~(IRQ_BANK1 | IRQ_BANK2))
 184         {
 185             for (irq = (2 << 5); irq < ((2 << 5) + 8); irq++)
 186             {
 187                 if (pendingarm & (1 << (irq - (2 << 5))))
 188                 {
 189                     DIRQ(bug("[KRN:BCM2708] Handling IRQ %d ..\n", irq));
 190                     krnRunIRQHandlers(KernelBase, irq);
 191                 }
 192             }
 193         }
 194
 195         if (pending0)
 196         {
 197             for (irq = (0 << 5); irq < ((0 << 5) + 32); irq++)
 198             {
 199                 if (pending0 & (1 << (irq - (0 << 5))))
 200                 {
 201                     DIRQ(bug("[KRN:BCM2708] Handling IRQ %d ..\n", irq));
 202                     krnRunIRQHandlers(KernelBase, irq);
 203                 }
 204             }
 205         }
 206
 207         if (pending1)
 208         {
 209             for (irq = (1 << 5); irq < ((1 << 5) + 32); irq++)
 210             {
 211                 if (pending1 & (1 << (irq - (1 << 5))))
 212                 {
 213                     DIRQ(bug("[KRN:BCM2708] Handling IRQ %d ..\n", irq));
 214                     krnRunIRQHandlers(KernelBase, irq);
 215                 }
 216             }
 217         }
 218     }
 219 }
 220
 221 static void bcm2807_fiq_process()
 222 {
 223     uint32_t tmp, fiq;
 224
 225     asm volatile (" mrc p15, 0, %0, c0, c0, 5 " : "=r" (tmp));
 226
 227     DFIQ(bug("[KRN:BCM2708] %s(%d)\n", __PRETTY_FUNCTION__, (tmp & 0x3)));
 228
 229     fiq = *((uint32_t *)(BCM2836_FIQ_PEND0 + (0x4 * (tmp & 0x3))));
 230
 231     DFIQ(bug("[KRN:BCM2708] %s: FIQ %x\n", __PRETTY_FUNCTION__, fiq));
 232
 233     *((uint32_t *)(BCM2836_FIQ_PEND0 + (0x4 * (tmp & 0x3)))) = fiq;
 234 }
 235
 236 static void bcm2708_toggle_led(int LED, int state)
 237 {
 238     if (__arm_arosintern.ARMI_PeripheralBase == (APTR)BCM2836_PERIPHYSBASE)
 239     {
 240         int pin = 35;
 241         APTR gpiofunc = GPCLR1;
 242
 243         if (LED == ARM_LED_ACTIVITY)
 244             pin = 47;
 245
 246         if (state == ARM_LED_ON)
 247             gpiofunc = GPSET1;
 248
 249         *(volatile unsigned int *)gpiofunc = (1 << (pin-32));
 250     }
 251     else
 252     {
 253         // RasPi 1 only allows us to toggle the activity LED
 254         if (state)
 255             *(volatile unsigned int *)GPCLR0 = (1 << 16);
 256         else
 257             *(volatile unsigned int *)GPSET0 = (1 << 16);
 258     }
 259 }
 260
 261 /* Use system timer 3 for our scheduling heartbeat */
 262 #define VBLANK_TIMER            3
 263 #define VBLANK_INTERVAL         (1000000 / 50)
 264
 265 static void bcm2708_gputimer_handler(unsigned int timerno, void *unused1)
 266 {
 267     unsigned int stc;
 268
 269     DTIMER(bug("[KRN:BCM2708] %s(%d)\n", __PRETTY_FUNCTION__, timerno));
 270
 271     /* Aknowledge our timer interrupt */
 272     *((volatile unsigned int *)(SYSTIMER_CS)) = 1 << timerno;
 273
 274     /* Signal the Exec VBlankServer */
 275     if (SysBase && (SysBase->IDNestCnt < 0)) {
 276         core_Cause(INTB_VERTB, 1L << INTB_VERTB);
 277     }
 278
 279     /* Refresh our timer interrupt */
 280     stc = *((volatile unsigned int *)(SYSTIMER_CLO));
 281     stc += VBLANK_INTERVAL;
 282     *((volatile unsigned int *)(SYSTIMER_C0 + (timerno * 4))) = stc;
 283
 284     DTIMER(bug("[BCM2708] %s: Done..\n", __PRETTY_FUNCTION__));
 285 }
 286
 287 static APTR bcm2708_init_gputimer(APTR _kernelBase)
 288 {
 289     struct KernelBase *KernelBase = (struct KernelBase *)_kernelBase;
 290     struct IntrNode *GPUTimerHandle;
 291     unsigned int stc;
 292
 293     DTIMER(bug("[KRN:BCM2708] %s(%012p)\n", __PRETTY_FUNCTION__, KernelBase));
 294
 295     if ((GPUTimerHandle = AllocMem(sizeof(struct IntrNode), MEMF_PUBLIC|MEMF_CLEAR)) != NULL)
 296     {
 297         DTIMER(bug("[KRN:BCM2708] %s: IntrNode @ 0x%p:\n", __PRETTY_FUNCTION__, GPUTimerHandle));
 298         DTIMER(bug("[KRN:BCM2708] %s: Using GPUTimer %d for VBlank\n", __PRETTY_FUNCTION__, VBLANK_TIMER));
 299
 300         GPUTimerHandle->in_Handler = bcm2708_gputimer_handler;
 301         GPUTimerHandle->in_HandlerData = (void *)VBLANK_TIMER;
 302         GPUTimerHandle->in_HandlerData2 = KernelBase;
 303         GPUTimerHandle->in_type = it_interrupt;
 304         GPUTimerHandle->in_nr = IRQ_TIMER0 + VBLANK_TIMER;
 305
 306         ADDHEAD(&KernelBase->kb_Interrupts[IRQ_TIMER0 + VBLANK_TIMER], &GPUTimerHandle->in_Node);
 307
 308         DTIMER(bug("[KRN:BCM2708] %s: Enabling Hardware IRQ.. \n", __PRETTY_FUNCTION__));
 309
 310         stc = *((volatile unsigned int *)(SYSTIMER_CLO));
 311         stc += VBLANK_INTERVAL;
 312         *((volatile unsigned int *)(SYSTIMER_CS)) = (1 << VBLANK_TIMER);
 313         *((volatile unsigned int *)(SYSTIMER_C0 + (VBLANK_TIMER * 4))) = stc;
 314
 315         ictl_enable_irq(IRQ_TIMER0 + VBLANK_TIMER, KernelBase);
 316     }
 317
 318     DTIMER(bug("[KRN:BCM2708] %s: Done.. \n", __PRETTY_FUNCTION__));
 319
 320     return GPUTimerHandle;
 321 }
 322
 323 static inline void bcm2708_ser_waitout()
 324 {
 325     while(1)
 326     {
 327        if ((*(volatile uint32_t *)(PL011_0_BASE + PL011_FR) & PL011_FR_TXFF) == 0) break;
 328     }
 329 }
 330
 331 static void bcm2708_ser_putc(uint8_t chr)
 332 {
 333     bcm2708_ser_waitout();
 334
 335     if (chr == '\n')
 336     {
 337         *(volatile uint32_t *)(PL011_0_BASE + PL011_DR) = '\r';
 338         bcm2708_ser_waitout();
 339     }
 340     *(volatile uint32_t *)(PL011_0_BASE + PL011_DR) = chr;
 341 }
 342
 343 static int bcm2708_ser_getc(void)
 344 {
 345     if ((*(volatile uint32_t *)(PL011_0_BASE + PL011_FR) & PL011_FR_RXFE) == 0)
 346         return (int)*(volatile uint32_t *)(PL011_0_BASE + PL011_DR);
 347
 348     return -1;
 349 }
 350
 351 static IPTR bcm2708_probe(struct ARM_Implementation *krnARMImpl, struct TagItem *msg)
 352 {
 353     void *bootPutC = NULL;
 354
 355     while(msg->ti_Tag != TAG_DONE)
 356     {
 357         switch (msg->ti_Tag)
 358         {
 359         case KRN_FuncPutC:
 360             bootPutC = (void *)msg->ti_Data;
 361             break;
 362         }
 363         msg++;
 364     }
 365
 366     if (krnARMImpl->ARMI_Platform != 0xc42)
 367         return FALSE;
 368
 369     if (krnARMImpl->ARMI_Family == 7)
 370     {
 371         /*  bcm2836 uses armv7 */
 372         krnARMImpl->ARMI_PeripheralBase = (APTR)BCM2836_PERIPHYSBASE;
 373         krnARMImpl->ARMI_InitCore = &bcm2708_init_core;
 374         krnARMImpl->ARMI_FIQProcess = &bcm2807_fiq_process;
 375     }
 376     else
 377         krnARMImpl->ARMI_PeripheralBase = (APTR)BCM2835_PERIPHYSBASE;
 378
 379     krnARMImpl->ARMI_GetTime = &bcm2807_get_time;
 380     krnARMImpl->ARMI_InitTimer = &bcm2708_init_gputimer;
 381     krnARMImpl->ARMI_LED_Toggle = &bcm2708_toggle_led;
 382
 383     krnARMImpl->ARMI_SerPutChar = &bcm2708_ser_putc;
 384     krnARMImpl->ARMI_SerGetChar = &bcm2708_ser_getc;
 385     if ((krnARMImpl->ARMI_PutChar = bootPutC) != NULL)
 386             krnARMImpl->ARMI_PutChar(0xFF); // Clear the display
 387
 388     krnARMImpl->ARMI_IRQInit = &bcm2807_irq_init;
 389     krnARMImpl->ARMI_IRQEnable = &bcm2807_irq_enable;
 390     krnARMImpl->ARMI_IRQDisable = &bcm2807_irq_disable;
 391     krnARMImpl->ARMI_IRQProcess = &bcm2807_irq_process;
 392
 393     krnARMImpl->ARMI_Init = &bcm2708_init;
 394
 395     return TRUE;
 396 }
 397
 398 ADD2SET(bcm2708_probe, ARMPLATFORMS, 0);