Apple16X50PCI.cpp   [plain text]


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/*
 * ApplePCI16X50Serial.cpp
 * This file contains the implementation of device driver for a 16650-family
 * serial device connected as a PCI device.  This subclass provides only the routines
 * necessary to detect and initialize the hardware, as well as map the
 * device registers and field interrupts.  All other functions are handled
 * by the client-class "com_apple_driver_16X50UARTSync".
 * 
 * 2002-02-15	dreece	I/O Kit port, based on NeXT drvISASerialPort DriverKit driver.
 */

#include "Apple16X50PCI.h"
#include <IOKit/serial/IOSerialKeys.h>

#define BAR_OFFSET_TO_REFCON(bar, off)	( (void *)( ((bar)&0x07)|((off)&0x18) ) )
#define REFCON_TO_OFFSET(ref)		( (UInt32)( ((UInt32)ref) & 0x18 ) )
#define REFCON_TO_BAR(ref)		( (UInt32)( ((UInt32)ref) & 0x07 ) )

#define super Apple16X50BusInterface
OSDefineMetaClassAndStructors(com_apple_driver_16X50PCI, com_apple_driver_16X50BusInterface)

IOService *Apple16X50PCI::
probe(IOService *provider, SInt32 *score)
{
    Provider = OSDynamicCast(IOPCIDevice, provider);
    if (!Provider) {
        IOLog ("Apple16X50PCI: Attached to non-IOPCIDevice provider!  Failing probe()\n");
        return NULL;
    }

    if (!super::probe(provider, score)) return NULL;

    char buf[80];
    UInt8 dev  = Provider->getDeviceNumber();
    UInt8 func = Provider->getFunctionNumber();
    UInt8 bus  = Provider->getBusNumber();
    
    OSData *propData = OSDynamicCast(OSData, Provider->getProperty("AAPL,slot-name"));
    if (propData && (propData->getLength()) < 16)
        snprintf(buf, sizeof (buf), "PCI %s Bus=%d Dev=%d Func=%d", (char *)(propData->getBytesNoCopy()), bus, dev, func);
    else
        snprintf(buf, sizeof (buf), "PCI Bus=%d Dev=%d Func=%d", bus, dev, func);
    setProperty(kLocationKey, buf);
    Location = (OSDynamicCast(OSString, getProperty(kLocationKey))->getCStringNoCopy());

    setProperty(kIOTTYBaseNameKey, "pci-serial");  // this will be the TTY base name for all UARTS
    InterfaceBaseName="PCI Serial Adapter"; // this will (eventually) be displayed in NetworkPrefs
    
    InterfaceInstance=dev;

    snprintf(buf, sizeof (buf), "Apple16X50PCI%d", (int)InterfaceInstance);
    setName(buf);
    
    // turn off all access except Config space (for now)
    Provider->setMemoryEnable(false);
    Provider->setIOEnable(false);
    Provider->setBusMasterEnable(false);

    return this;
}

Apple16X50UARTSync *Apple16X50PCI::
probeUART(void* refCon, Apple16X50UARTSync *uart, OSDictionary *properties)
{
    char buf[80];

    uart = super::probeUART(refCon, uart, properties);
    if (!uart) return false;
    
    snprintf(buf, sizeof (buf), "%s BAR=%lu Offset=%lu", Location, REFCON_TO_BAR((uintptr_t)refCon), REFCON_TO_OFFSET((uintptr_t)refCon));
    uart->setProperty(kLocationKey, buf);
    return uart;    
}

// This routine examines a base address register (BAR) in the PCI Device's
// Config space.  If the BAR meets all the criteria, then it is mapped
bool Apple16X50PCI::
setupBAR (UInt32 bar, UInt32 maxUARTs)
{
    register UInt32 barsize, implemented;
    UInt32 barbase, addr=kIOPCIConfigBaseAddress0+(bar<<2);
    barbase = Provider->configRead32(addr);	
    Provider->configWrite32(addr, ~barbase);
    implemented = barbase ^ (Provider->configRead32(addr)); // implemented bits are 1, all others 0
    if ((barbase & implemented) == 0)
        goto skip;  // This BAR is not configured
    Provider->configWrite32(addr, barbase);
    // BAR size determined by least-significant implemented bit
    for (barsize=1; barsize; barsize<<=1)
        if (barsize & implemented) break;
    DEBUG_IOLog("%s: BAR[%d]=0x%08x:0x%08x (len=%d bytes)\n", Name,
                (int)bar, (int)barbase, (int)implemented, (int)barsize);
    if ((barbase & 0x01) != 0x01) goto skip; // not an I/O Range
    if (barsize > (maxUARTs*kREG_Size)) goto skip; // range is too big
    if (barsize < (kREG_Size)) goto skip; // range is too small
    Map[bar] = Provider->mapDeviceMemoryWithRegister(addr);
    if (!(Map[bar])) goto skip;
    Len[bar]=barsize;
    return true;
    
   skip:
    RELEASE(Map[bar]);
    Len[bar]=0;
    return false;
}

UInt32 Apple16X50PCI::
scanBARforUARTs (UInt32 bar, UInt32 maxUARTs)
{
    register UInt32 count=0, offset;
    
    if (Map[bar] && Len[bar]) {
	for (offset=0; offset<Len[bar]; offset+=kREG_Size) {
            if (probeUART(BAR_OFFSET_TO_REFCON(bar,offset)))
                count++;
            else break; // look no further
        }
	if (!count) { // no UARTs were found
            RELEASE(Map[bar]);
            Len[bar]=0;
	}
    }
    return count;
}

bool Apple16X50PCI::
start(IOService *provider)
{
    UInt32 bar;
    DEBUG_IOLog("%s: %s ID=%04x:%04x SID=%04x:%04x Class=%02x:%02x:%02x Int=%d\n",
        Name, Location,
        (int)(Provider->configRead16(kIOPCIConfigVendorID)),
        (int)(Provider->configRead16(kIOPCIConfigDeviceID)),
        (int)(Provider->configRead16(kIOPCIConfigSubSystemVendorID)),
        (int)(Provider->configRead16(kIOPCIConfigSubSystemID)),
        (int)(Provider->configRead8(kIOPCIConfigClassCode+2)),
        (int)(Provider->configRead8(kIOPCIConfigClassCode+1)),
        (int)(Provider->configRead8(kIOPCIConfigClassCode+0)),
        (int)(Provider->configRead8(kIOPCIConfigInterruptPin))
    );

    // Setup all relevant BARs in a single pass before enabling IO space
    for (bar=0; bar<MAX_BARS; bar++)
        setupBAR(bar, bar?1:4);
        
    // Examine the first MAX_BARS bars.  We allow up to four
    // uarts concatinated in the first bar, or one uart per bar.
    // This covers both common addressing schemes without too many false hits.
    // XXX - This should be alterable via a property
    Provider->setIOEnable(true);
    for (bar=0; bar<MAX_BARS; bar++) {
        UInt32 count = scanBARforUARTs(bar, bar?1:4);
        if (count != 1) break;
    }

    if (UARTInstance==0) goto fail;
    if (!super::start(provider)) goto fail;
    
    IOLog("%s: Identified %d Serial channels at %s\n", Name, (int)UARTInstance, Location);
    startUARTs();

    return true;

fail:
    Provider->setIOEnable(false);
    return false;
}

void Apple16X50PCI::
stop(IOService *provider)
{
    DEBUG_IOLog("%s: stop(%p)\n", Name, provider);
    super::stop(provider);
    DEBUG_IOLog("%s::stop() releasing UARTs\n", Name);
    for (UInt32 i=0; i<UARTInstance; i++)
        RELEASE(UART[i]);
    Provider->setIOEnable(false);
}

void Apple16X50PCI::
free()
{
    UInt32 i;
    DEBUG_IOLog("%s: free()\n", Name);
    for (i=0; i<MAX_BARS; i++) RELEASE(Map[i]);
    super::free();
}

UInt8 Apple16X50PCI::
getReg(UInt32 reg, void *refCon)
{
    return (Provider->ioRead8(reg+REFCON_TO_OFFSET((uintptr_t)refCon), Map[REFCON_TO_BAR((uintptr_t)refCon)]));
}

void Apple16X50PCI::
setReg(UInt32 reg, UInt8 val, void *refCon)
{
    Provider->ioWrite8(reg+REFCON_TO_OFFSET((uintptr_t)refCon), val, Map[REFCON_TO_BAR((uintptr_t)refCon)]);
}