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/* sbus.c:  SBus support routines.

 *

 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)

 */

#include <linux/kernel.h>

#include <linux/malloc.h>

#include <asm/system.h>

#include <asm/sbus.h>

#include <asm/dma.h>

#include <asm/oplib.h>

/* This file has been written to be more dynamic and a bit cleaner,

 * but it still needs some spring cleaning.

 */

struct linux_sbus *SBus_chain;

static char lbuf[128];

/* Perhaps when I figure out more about the iommu we'll put a

 * device registration routine here that probe_sbus() calls to

 * setup the iommu for each Sbus.

 */

/* We call this for each SBus device, and fill the structure based

 * upon the prom device tree.  We return the start of memory after

 * the things we have allocated.

 */

/* #define DEBUG_FILL */

void

fill_sbus_device(int nd, struct linux_sbus_device *sbus_dev)

{

        int grrr, len;

        unsigned long dev_base_addr, base;

        sbus_dev->prom_node = nd;

        prom_getstring(nd, "name", lbuf, sizeof(lbuf));

        strcpy(sbus_dev->prom_name, lbuf);

        dev_base_addr = prom_getint(nd, "address");

        if(dev_base_addr != -1)

                sbus_dev->sbus_addr = dev_base_addr;

        len = prom_getproperty(nd, "reg", (void *) sbus_dev->reg_addrs,

                               sizeof(sbus_dev->reg_addrs));

        if(len%sizeof(struct linux_prom_registers)) {

                prom_printf("WHOOPS:  proplen for %s was %d, need multiple of %d\n",

                       sbus_dev->prom_name, len,

                       (int) sizeof(struct linux_prom_registers));

                panic("fill_sbus_device");

        }

        sbus_dev->num_registers = (len/sizeof(struct linux_prom_registers));

        base = (unsigned long) sbus_dev->reg_addrs[0].phys_addr;

        if(base>=SUN_SBUS_BVADDR || sparc_cpu_model == sun4m) {

                /* Ahh, we can determine the slot and offset */

                sbus_dev->slot = sbus_dev_slot(base);

                sbus_dev->offset = sbus_dev_offset(base);

        } else {   /* Grrr, gotta do calculations to fix things up */

                sbus_dev->slot = sbus_dev->reg_addrs[0].which_io;

                sbus_dev->offset = base;

                sbus_dev->reg_addrs[0].phys_addr =

                        (char *) sbus_devaddr(sbus_dev->slot, base);

                for(grrr=1; grrr<sbus_dev->num_registers; grrr++) {

                        base = (unsigned long) sbus_dev->reg_addrs[grrr].phys_addr;

                        sbus_dev->reg_addrs[grrr].phys_addr = (char *)

                                sbus_devaddr(sbus_dev->slot, base);

                }

                /* That surely sucked */

        }

        sbus_dev->sbus_addr = (unsigned long) sbus_dev->reg_addrs[0].phys_addr;

        if(len>(sizeof(struct linux_prom_registers)*PROMREG_MAX)) {

                prom_printf("WHOOPS:  I got too many register addresses for %s  len=%d\n",

                       sbus_dev->prom_name, len);

                panic("sbus device register overflow");

        }

        len = prom_getproperty(nd, "address", (void *) sbus_dev->sbus_vaddrs,

                               sizeof(sbus_dev->sbus_vaddrs));

        if(len == -1) len=0;

        if(len&3) {

                prom_printf("Grrr, I didn't get a multiple of 4 proplen "

                       "for device %s got %d\n", sbus_dev->prom_name, len);

                len=0;

        }

        sbus_dev->num_vaddrs = (len/4);

        len = prom_getproperty(nd, "intr", (void *)sbus_dev->irqs,

                               sizeof(sbus_dev->irqs));

        if (len == -1) len=0;

        if (len&7) {

                prom_printf("Grrr, I didn't get a multiple of 8 proplen for "

                       "device %s got %d\n", sbus_dev->prom_name, len);

                len=0;

        }

        sbus_dev->num_irqs=(len/8);

#if OLD_STYLE_IRQ

        /* Grrr, V3 prom tries to be efficient */

        for(len=0; len<sbus_dev->num_irqs; len++) {

                sbus_dev->irqs[len].pri &= 0xf;

        }

#endif

        if(sbus_dev->num_irqs == 0) sbus_dev->irqs[0].pri=0;

#ifdef DEBUG_FILL

        prom_printf("Found %s at SBUS slot %x offset %08lx irq-level %d\n",

               sbus_dev->prom_name, sbus_dev->slot, sbus_dev->offset,

               sbus_dev->irqs[0].pri);

        prom_printf("Base address %08lx\n", sbus_dev->sbus_addr);

        prom_printf("REGISTERS: Probed %d register(s)\n", sbus_dev->num_registers);

        for(len=0; len<sbus_dev->num_registers; len++)

                prom_printf("Regs<%d> at address<%08lx> IO-space<%d> size<%d "

                       "bytes, %d words>\n", (int) len,

                       (unsigned long) sbus_dev->reg_addrs[len].phys_addr,

                       sbus_dev->reg_addrs[len].which_io,

                       sbus_dev->reg_addrs[len].reg_size,

                       (sbus_dev->reg_addrs[len].reg_size/4));

#endif

        return;

}

/* This routine gets called from whoever needs the sbus first, to scan

 * the SBus device tree.  Currently it just prints out the devices

 * found on the bus and builds trees of SBUS structs and attached

 * devices.

 */

extern void sun_console_init(void);

extern unsigned long iommu_init(int iommu_node, unsigned long memstart,

                                unsigned long memend, struct linux_sbus *sbus);

unsigned long

sbus_init(unsigned long memory_start, unsigned long memory_end)

{

        register int nd, this_sbus, sbus_devs, topnd, iommund;

        unsigned int sbus_clock;

        struct linux_sbus *sbus;

        struct linux_sbus_device *this_dev;

        int num_sbus = 0;  /* How many did we find? */

        memory_start = ((memory_start + 7) & (~7));

        topnd = prom_getchild(prom_root_node);

        /* Finding the first sbus is a special case... */

        iommund = 0;

        if((nd = prom_searchsiblings(topnd, "sbus")) == 0) {

                if((iommund = prom_searchsiblings(topnd, "iommu")) == 0 ||

                   (nd = prom_getchild(iommund)) == 0 ||

                   (nd = prom_searchsiblings(nd, "sbus")) == 0) {

                        /* No reason to run further - the data access trap will occur. */

                        panic("sbus not found");

                }

        }

        /* Ok, we've found the first one, allocate first SBus struct

         * and place in chain.

         */

        sbus = SBus_chain = (struct linux_sbus *) memory_start;

        memory_start += sizeof(struct linux_sbus);

        sbus->next = 0;

        this_sbus=nd;

        /* Have IOMMU will travel. XXX grrr - this should be per sbus... */

        if(iommund)

                memory_start = iommu_init(iommund, memory_start, memory_end, sbus);

        /* Loop until we find no more SBUS's */

        while(this_sbus) {

                printk("sbus%d: ", num_sbus);

                sbus_clock = prom_getint(this_sbus, "clock-frequency");

                if(sbus_clock==-1) sbus_clock = (25*1000*1000);

                printk("Clock %d.%d MHz\n", (int) ((sbus_clock/1000)/1000),

                       (int) (((sbus_clock/1000)%1000 != 0) ?

                              (((sbus_clock/1000)%1000) + 1000) : 0));

                prom_getstring(this_sbus, "name", lbuf, sizeof(lbuf));

                sbus->prom_node = this_sbus;

                strcpy(sbus->prom_name, lbuf);

                sbus->clock_freq = sbus_clock;

                sbus_devs = prom_getchild(this_sbus);

                sbus->devices = (struct linux_sbus_device *) memory_start;

                memory_start += sizeof(struct linux_sbus_device);

                this_dev = sbus->devices;

                this_dev->next = 0;

                fill_sbus_device(sbus_devs, this_dev);

                this_dev->my_bus = sbus;

                /* Should we traverse for children? */

                if(strcmp(this_dev->prom_name, "espdma")==0 ||

                   strcmp(this_dev->prom_name, "ledma")==0) {

                        /* Allocate device node */

                        this_dev->child = (struct linux_sbus_device *) memory_start;

                        memory_start += sizeof(struct linux_sbus_device);

                        /* Fill it */

                        fill_sbus_device(prom_getchild(sbus_devs), this_dev->child);

                        this_dev->child->my_bus = sbus;

                } else {

                        this_dev->child = 0;

                }

                while((sbus_devs = prom_getsibling(sbus_devs)) != 0) {

                        /* Allocate device node */

                        this_dev->next = (struct linux_sbus_device *) memory_start;

                        memory_start += sizeof(struct linux_sbus_device);

                        this_dev=this_dev->next;

                        this_dev->next=0;

                        /* Fill it */

                        fill_sbus_device(sbus_devs, this_dev);

                        this_dev->my_bus = sbus;

                        /* Is there a child node hanging off of us? */

                        if(strcmp(this_dev->prom_name, "espdma")==0 ||

                           strcmp(this_dev->prom_name, "ledma")==0) {

                                /* Get new device struct */

                                this_dev->child =

                                        (struct linux_sbus_device *) memory_start;

                                memory_start += sizeof(struct linux_sbus_device);

                                /* Fill it */

                                fill_sbus_device(prom_getchild(sbus_devs),

                                                 this_dev->child);

                                this_dev->child->my_bus = sbus;

                        } else {

                                this_dev->child = 0;

                        }

                }

                memory_start = dvma_init(sbus, memory_start);

                num_sbus++;

                this_sbus = prom_getsibling(this_sbus);

                if(!this_sbus) break;

                this_sbus = prom_searchsiblings(this_sbus, "sbus");

                if(this_sbus) {

                        sbus->next = (struct linux_sbus *) memory_start;

                        memory_start += sizeof(struct linux_sbus);

                        sbus = sbus->next;

                        sbus->next = 0;

                } else {

                        break;

                }

        } /* while(this_sbus) */

        sun_console_init(); /* whee... */

        return memory_start;

}