FreeBSD/Linux Kernel Cross Reference
sys/arm/xscale/pxa/pxa_machdep.c

     /*      $NetBSD: hpc_machdep.c,v 1.70 2003/09/16 08:18:22 agc Exp $     */
     
     /*-
      * Copyright (c) 1994-1998 Mark Brinicombe.
      * Copyright (c) 1994 Brini.
      * All rights reserved.
      *
      * This code is derived from software written for Brini by Mark Brinicombe
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Brini.
     * 4. The name of the company nor the name of the author may be used to
     *    endorse or promote products derived from this software without specific
     *    prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
     * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * RiscBSD kernel project
     *
     * machdep.c
     *
     * Machine dependant functions for kernel setup
     *
     * This file needs a lot of work. 
     *
     * Created      : 17/09/94
     */
    
    #include "opt_msgbuf.h"
    #include "opt_ddb.h"
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/8.2/sys/arm/xscale/pxa/pxa_machdep.c 194784 2009-06-23 22:42:39Z jeff $");
    
    #define _ARM32_BUS_DMA_PRIVATE
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/sysproto.h>
    #include <sys/signalvar.h>
    #include <sys/imgact.h>
    #include <sys/kernel.h>
    #include <sys/ktr.h>
    #include <sys/linker.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    #include <sys/pcpu.h>
    #include <sys/proc.h>
    #include <sys/ptrace.h>
    #include <sys/cons.h>
    #include <sys/bio.h>
    #include <sys/bus.h>
    #include <sys/buf.h>
    #include <sys/exec.h>
    #include <sys/kdb.h>
    #include <sys/msgbuf.h>
    #include <machine/reg.h>
    #include <machine/cpu.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    #include <vm/vm_object.h>
    #include <vm/vm_page.h>
    #include <vm/vm_pager.h>
    #include <vm/vm_map.h>
    #include <vm/vnode_pager.h>
    #include <machine/pmap.h>
    #include <machine/vmparam.h>
    #include <machine/pcb.h>
    #include <machine/undefined.h>
    #include <machine/machdep.h>
    #include <machine/metadata.h>
    #include <machine/armreg.h>
    #include <machine/bus.h>
    #include <sys/reboot.h>
    
    #include <arm/xscale/pxa/pxareg.h>
    #include <arm/xscale/pxa/pxavar.h>
    
    #define KERNEL_PT_SYS           0       /* Page table for mapping proc0 zero page */
   #define KERNEL_PT_IOPXS         1
   #define KERNEL_PT_BEFOREKERN    2
   #define KERNEL_PT_AFKERNEL      3       /* L2 table for mapping after kernel */
   #define KERNEL_PT_AFKERNEL_NUM  9
   
   /* this should be evenly divisable by PAGE_SIZE / L2_TABLE_SIZE_REAL (or 4) */
   #define NUM_KERNEL_PTS          (KERNEL_PT_AFKERNEL + KERNEL_PT_AFKERNEL_NUM)
   
   /* Define various stack sizes in pages */
   #define IRQ_STACK_SIZE  1
   #define ABT_STACK_SIZE  1
   #define UND_STACK_SIZE  1
   
   extern u_int data_abort_handler_address;
   extern u_int prefetch_abort_handler_address;
   extern u_int undefined_handler_address;
   
   struct pv_addr kernel_pt_table[NUM_KERNEL_PTS];
   
   extern void *_end;
   
   extern int *end;
   
   struct pcpu __pcpu;
   struct pcpu *pcpup = &__pcpu;
   
   /* Physical and virtual addresses for some global pages */
   
   vm_paddr_t phys_avail[PXA2X0_SDRAM_BANKS * 2 + 4];
   vm_paddr_t dump_avail[PXA2X0_SDRAM_BANKS * 2 + 4];
   vm_offset_t physical_pages;
   
   struct pv_addr systempage;
   struct pv_addr msgbufpv;
   struct pv_addr irqstack;
   struct pv_addr undstack;
   struct pv_addr abtstack;
   struct pv_addr kernelstack;
   struct pv_addr minidataclean;
   
   static struct trapframe proc0_tf;
   
   static void     pxa_probe_sdram(bus_space_tag_t, bus_space_handle_t,
                       uint32_t *, uint32_t *);
   
   /* Static device mappings. */
   static const struct pmap_devmap pxa_devmap[] = {
           /* 
            * Map the on-board devices up into the KVA region so we don't muck
            * up user-space.
            */
           {
                   PXA2X0_PERIPH_START + PXA2X0_PERIPH_OFFSET,
                   PXA2X0_PERIPH_START,
                   PXA250_PERIPH_END - PXA2X0_PERIPH_START,
                   VM_PROT_READ|VM_PROT_WRITE,
                   PTE_NOCACHE,
           },
           { 0, 0, 0, 0, 0, }
   };
   
   #define SDRAM_START 0xa0000000
   
   extern vm_offset_t xscale_cache_clean_addr;
   
   void *
   initarm(void *arg, void *arg2)
   {
           struct pv_addr  kernel_l1pt;
           struct pv_addr  dpcpu;
           int loop;
           u_int l1pagetable;
           vm_offset_t freemempos;
           vm_offset_t freemem_pt;
           vm_offset_t afterkern;
           vm_offset_t freemem_after;
           vm_offset_t lastaddr;
           int i, j;
           uint32_t memsize[PXA2X0_SDRAM_BANKS], memstart[PXA2X0_SDRAM_BANKS];
   
           set_cpufuncs();
   
           lastaddr = fake_preload_metadata();
           pcpu_init(pcpup, 0, sizeof(struct pcpu));
           PCPU_SET(curthread, &thread0);
   
           freemempos = 0xa0200000;
           /* Define a macro to simplify memory allocation */
   #define valloc_pages(var, np)                   \
           alloc_pages((var).pv_pa, (np));         \
           (var).pv_va = (var).pv_pa + 0x20000000;
   
   #define alloc_pages(var, np)                    \
           freemempos -= (np * PAGE_SIZE);         \
           (var) = freemempos;             \
           memset((char *)(var), 0, ((np) * PAGE_SIZE));
   
           while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
                   freemempos -= PAGE_SIZE;
           valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
           for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
                   if (!(loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
                           valloc_pages(kernel_pt_table[loop],
                               L2_TABLE_SIZE / PAGE_SIZE);
                   } else {
                           kernel_pt_table[loop].pv_pa = freemempos +
                               (loop % (PAGE_SIZE / L2_TABLE_SIZE_REAL)) *
                               L2_TABLE_SIZE_REAL;
                           kernel_pt_table[loop].pv_va = 
                               kernel_pt_table[loop].pv_pa + 0x20000000;
                   }
                   i++;
           }
           freemem_pt = freemempos;
           freemempos = 0xa0100000;
           /*
            * Allocate a page for the system page mapped to V0x00000000
            * This page will just contain the system vectors and can be
            * shared by all processes.
            */
           valloc_pages(systempage, 1);
   
           /* Allocate dynamic per-cpu area. */
           valloc_pages(dpcpu, DPCPU_SIZE / PAGE_SIZE);
           dpcpu_init((void *)dpcpu.pv_va, 0);
   
           /* Allocate stacks for all modes */
           valloc_pages(irqstack, IRQ_STACK_SIZE);
           valloc_pages(abtstack, ABT_STACK_SIZE);
           valloc_pages(undstack, UND_STACK_SIZE);
           valloc_pages(kernelstack, KSTACK_PAGES);
           alloc_pages(minidataclean.pv_pa, 1);
           valloc_pages(msgbufpv, round_page(MSGBUF_SIZE) / PAGE_SIZE);
   #ifdef ARM_USE_SMALL_ALLOC
           freemempos -= PAGE_SIZE;
           freemem_pt = trunc_page(freemem_pt);
           freemem_after = freemempos - ((freemem_pt - 0xa0100000) /
               PAGE_SIZE) * sizeof(struct arm_small_page);
           arm_add_smallalloc_pages((void *)(freemem_after + 0x20000000)
               , (void *)0xc0100000, freemem_pt - 0xa0100000, 1);
           freemem_after -= ((freemem_after - 0xa0001000) / PAGE_SIZE) *
               sizeof(struct arm_small_page);
           arm_add_smallalloc_pages((void *)(freemem_after + 0x20000000)
           , (void *)0xc0001000, trunc_page(freemem_after) - 0xa0001000, 0);
           freemempos = trunc_page(freemem_after);
           freemempos -= PAGE_SIZE;
   #endif
           /*
            * Allocate memory for the l1 and l2 page tables. The scheme to avoid
            * wasting memory by allocating the l1pt on the first 16k memory was
            * taken from NetBSD rpc_machdep.c. NKPT should be greater than 12 for
            * this to work (which is supposed to be the case).
            */
   
           /*
            * Now we start construction of the L1 page table
            * We start by mapping the L2 page tables into the L1.
            * This means that we can replace L1 mappings later on if necessary
            */
           l1pagetable = kernel_l1pt.pv_va;
   
           /* Map the L2 pages tables in the L1 page table */
           pmap_link_l2pt(l1pagetable, ARM_VECTORS_HIGH & ~(0x00100000 - 1),
               &kernel_pt_table[KERNEL_PT_SYS]);
   #if 0 /* XXXBJR: What is this?  Don't know if there's an analogue. */
           pmap_link_l2pt(l1pagetable, IQ80321_IOPXS_VBASE,
                           &kernel_pt_table[KERNEL_PT_IOPXS]);
   #endif
           pmap_link_l2pt(l1pagetable, KERNBASE,
               &kernel_pt_table[KERNEL_PT_BEFOREKERN]);
           pmap_map_chunk(l1pagetable, KERNBASE, SDRAM_START, 0x100000,
               VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
           pmap_map_chunk(l1pagetable, KERNBASE + 0x100000, SDRAM_START + 0x100000,
               0x100000, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
           pmap_map_chunk(l1pagetable, KERNBASE + 0x200000, SDRAM_START + 0x200000,
              (((uint32_t)(lastaddr) - KERNBASE - 0x200000) + L1_S_SIZE) & ~(L1_S_SIZE - 1),
               VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
           freemem_after = ((int)lastaddr + PAGE_SIZE) & ~(PAGE_SIZE - 1);
           afterkern = round_page(((vm_offset_t)lastaddr + L1_S_SIZE) &
               ~(L1_S_SIZE - 1));
           for (i = 0; i < KERNEL_PT_AFKERNEL_NUM; i++) {
                   pmap_link_l2pt(l1pagetable, afterkern + i * 0x00100000,
                       &kernel_pt_table[KERNEL_PT_AFKERNEL + i]);
           }
           pmap_map_entry(l1pagetable, afterkern, minidataclean.pv_pa, 
               VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
   
   #ifdef ARM_USE_SMALL_ALLOC
           if ((freemem_after + 2 * PAGE_SIZE) <= afterkern) {
                   arm_add_smallalloc_pages((void *)(freemem_after),
                       (void*)(freemem_after + PAGE_SIZE),
                       afterkern - (freemem_after + PAGE_SIZE), 0);
           }
   #endif
   
           /* Map the Mini-Data cache clean area. */
           xscale_setup_minidata(l1pagetable, afterkern,
               minidataclean.pv_pa);
   
           /* Map the vector page. */
           pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
               VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
           pmap_devmap_bootstrap(l1pagetable, pxa_devmap);
   
           /*
            * Give the XScale global cache clean code an appropriately
            * sized chunk of unmapped VA space starting at 0xff000000
            * (our device mappings end before this address).
            */
           xscale_cache_clean_addr = 0xff000000U;
   
           cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
           setttb(kernel_l1pt.pv_pa);
           cpu_tlb_flushID();
           cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));
   
           /*
            * Pages were allocated during the secondary bootstrap for the
            * stacks for different CPU modes.
            * We must now set the r13 registers in the different CPU modes to
            * point to these stacks.
            * Since the ARM stacks use STMFD etc. we must set r13 to the top end
            * of the stack memory.
            */
           set_stackptr(PSR_IRQ32_MODE,
               irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE);
           set_stackptr(PSR_ABT32_MODE,
               abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE);
           set_stackptr(PSR_UND32_MODE,
               undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE);
   
           /*
            * We must now clean the cache again....
            * Cleaning may be done by reading new data to displace any
            * dirty data in the cache. This will have happened in setttb()
            * but since we are boot strapping the addresses used for the read
            * may have just been remapped and thus the cache could be out
            * of sync. A re-clean after the switch will cure this.
            * After booting there are no gross relocations of the kernel thus
            * this problem will not occur after initarm().
            */
           cpu_idcache_wbinv_all();
   
           /*
            * Sort out bus_space for on-board devices.
            */
           pxa_obio_tag_init();
   
           /*
            * Fetch the SDRAM start/size from the PXA2X0 SDRAM configration
            * registers.
            */
           pxa_probe_sdram(obio_tag, PXA2X0_MEMCTL_BASE, memstart, memsize);
   
           physmem = 0;
           for (i = 0; i < PXA2X0_SDRAM_BANKS; i++) {
                   physmem += memsize[i] / PAGE_SIZE;
           }
   
           /* Fire up consoles. */
           cninit();
   
           /* Set stack for exception handlers */
           data_abort_handler_address = (u_int)data_abort_handler;
           prefetch_abort_handler_address = (u_int)prefetch_abort_handler;
           undefined_handler_address = (u_int)undefinedinstruction_bounce;
           undefined_init();
   
           proc_linkup(&proc0, &thread0);
           thread0.td_kstack = kernelstack.pv_va;
           thread0.td_pcb = (struct pcb *)
                   (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
           thread0.td_pcb->pcb_flags = 0;
           thread0.td_frame = &proc0_tf;
           pcpup->pc_curpcb = thread0.td_pcb;
   
           /* Enable MMU, I-cache, D-cache, write buffer. */
           arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
   
           pmap_curmaxkvaddr = afterkern + PAGE_SIZE;
           /*
            * ARM USE_SMALL_ALLOC uses dump_avail, so it must be filled before
            * calling pmap_bootstrap.
            */
           i = 0;
           for (j = 0; j < PXA2X0_SDRAM_BANKS; j++) {
                   if (memsize[j] > 0) {
                           dump_avail[i++] = round_page(memstart[j]);
                           dump_avail[i++] =
                               trunc_page(memstart[j] + memsize[j]);
                   }
           }
           dump_avail[i] = 0;
           dump_avail[i] = 0;
           pmap_bootstrap(pmap_curmaxkvaddr, 0xd0000000, &kernel_l1pt);
           msgbufp = (void*)msgbufpv.pv_va;
           msgbufinit(msgbufp, MSGBUF_SIZE);
           mutex_init();
   
           i = 0;
   #ifdef ARM_USE_SMALL_ALLOC
           phys_avail[i++] = 0xa0000000;
           phys_avail[i++] = 0xa0001000;   /*
                                            *XXX: Gross hack to get our
                                            * pages in the vm_page_array
                                            . */
   #endif
           for (j = 0; j < PXA2X0_SDRAM_BANKS; j++) {
                   if (memsize[j] > 0) {
                           phys_avail[i] = round_page(memstart[j]);
                           dump_avail[i++] = round_page(memstart[j]);
                           phys_avail[i] =
                               trunc_page(memstart[j] + memsize[j]);
                           dump_avail[i++] =
                               trunc_page(memstart[j] + memsize[j]);
                   }
           }
   
           dump_avail[i] = 0;
           phys_avail[i++] = 0;
           dump_avail[i] = 0;
           phys_avail[i] = 0;
   #ifdef ARM_USE_SMALL_ALLOC
           phys_avail[2] = round_page(virtual_avail - KERNBASE + phys_avail[2]);
   #else
           phys_avail[0] = round_page(virtual_avail - KERNBASE + phys_avail[0]);
   #endif
   
           /* Do basic tuning, hz etc */
           init_param1();
           init_param2(physmem);
           kdb_init();
           return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
               sizeof(struct pcb)));
   }
   
   static void
   pxa_probe_sdram(bus_space_tag_t bst, bus_space_handle_t bsh,
       uint32_t *memstart, uint32_t *memsize)
   {
           uint32_t        mdcnfg, dwid, dcac, drac, dnb;
           int             i;
   
           mdcnfg = bus_space_read_4(bst, bsh, MEMCTL_MDCNFG);
   
           /*
            * Scan all 4 SDRAM banks
            */
           for (i = 0; i < PXA2X0_SDRAM_BANKS; i++) {
                   memstart[i] = 0;
                   memsize[i] = 0;
   
                   switch (i) {
                   case 0:
                   case 1:
                           if ((i == 0 && (mdcnfg & MDCNFG_DE0) == 0) ||
                               (i == 1 && (mdcnfg & MDCNFG_DE1) == 0))
                                   continue;
                           dwid = mdcnfg >> MDCNFD_DWID01_SHIFT;
                           dcac = mdcnfg >> MDCNFD_DCAC01_SHIFT;
                           drac = mdcnfg >> MDCNFD_DRAC01_SHIFT;
                           dnb = mdcnfg >> MDCNFD_DNB01_SHIFT;
                           break;
   
                   case 2:
                   case 3:
                           if ((i == 2 && (mdcnfg & MDCNFG_DE2) == 0) ||
                               (i == 3 && (mdcnfg & MDCNFG_DE3) == 0))
                                   continue;
                           dwid = mdcnfg >> MDCNFD_DWID23_SHIFT;
                           dcac = mdcnfg >> MDCNFD_DCAC23_SHIFT;
                           drac = mdcnfg >> MDCNFD_DRAC23_SHIFT;
                           dnb = mdcnfg >> MDCNFD_DNB23_SHIFT;
                           break;
                   default:
                           panic("pxa_probe_sdram: impossible");
                   }
   
                   dwid = 2 << (1 - (dwid & MDCNFD_DWID_MASK));  /* 16/32 width */
                   dcac = 1 << ((dcac & MDCNFD_DCAC_MASK) + 8);  /* 8-11 columns */
                   drac = 1 << ((drac & MDCNFD_DRAC_MASK) + 11); /* 11-13 rows */
                   dnb = 2 << (dnb & MDCNFD_DNB_MASK);           /* # of banks */
   
                   memsize[i] = dwid * dcac * drac * dnb;
                   memstart[i] = PXA2X0_SDRAM0_START +
                       (i * PXA2X0_SDRAM_BANK_SIZE);
           }
   }
   
   #define TIMER_FREQUENCY 3686400
   #define UNIMPLEMENTED   panic("%s: unimplemented", __func__)
   
   /* XXXBJR: Belongs with DELAY in a timer.c of some sort. */
   void
   cpu_startprofclock(void)
   {
           UNIMPLEMENTED;
   }
   
   void
   cpu_stopprofclock(void)
   {
           UNIMPLEMENTED;
   }
   
   static struct arm32_dma_range pxa_range = {
           .dr_sysbase = 0,
           .dr_busbase = 0,
           .dr_len = ~0u,
   };
   
   struct arm32_dma_range *
   bus_dma_get_range(void)
   {
   
           return (&pxa_range);
   }
   
   int
   bus_dma_get_range_nb(void)
   {
   
           return (1);
   }

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