/*
* Code common to all CIA chips.
*
* Written by David A Rusling (david.rusling@reo.mts.dec.com).
* December 1995.
*
*/
#include <linux/kernel.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/bios32.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/hwrpb.h>
#include <asm/ptrace.h>
#include <asm/mmu_context.h>
extern struct hwrpb_struct *hwrpb;
extern asmlinkage void wrmces(unsigned long mces);
extern int alpha_sys_type;
/*
* BIOS32-style PCI interface:
*/
#ifdef CONFIG_ALPHA_CIA
#ifdef DEBUG
# define DBG(args) printk args
#else
# define DBG(args)
#endif
#define vulp volatile unsigned long *
#define vuip volatile unsigned int *
static volatile unsigned int CIA_mcheck_expected = 0;
static volatile unsigned int CIA_mcheck_taken = 0;
static unsigned long CIA_jd, CIA_jd1, CIA_jd2;
/*
* Given a bus, device, and function number, compute resulting
* configuration space address and setup the CIA_HAXR2 register
* accordingly. It is therefore not safe to have concurrent
* invocations to configuration space access routines, but there
* really shouldn't be any need for this.
*
* Type 0:
*
* 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
* 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | |D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|0|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* 31:11 Device select bit.
* 10:8 Function number
* 7:2 Register number
*
* Type 1:
*
* 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
* 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* 31:24 reserved
* 23:16 bus number (8 bits = 128 possible buses)
* 15:11 Device number (5 bits)
* 10:8 function number
* 7:2 register number
*
* Notes:
* The function number selects which function of a multi-function device
* (e.g., scsi and ethernet).
*
* The register selects a DWORD (32 bit) register offset. Hence it
* doesn't get shifted by 2 bits as we want to "drop" the bottom two
* bits.
*/
static int mk_conf_addr(unsigned char bus, unsigned char device_fn,
unsigned char where, unsigned long *pci_addr,
unsigned char *type1)
{
unsigned long addr;
DBG(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x, pci_addr=0x%p, type1=0x%p)\n",
bus, device_fn, where, pci_addr, type1));
if (bus == 0) {
int device = device_fn >> 3;
/* type 0 configuration cycle: */
if (device > 20) {
DBG(("mk_conf_addr: device (%d) > 20, returning -1\n", device));
return -1;
}
*type1 = 0;
addr = (device_fn << 8) | (where);
} else {
/* type 1 configuration cycle: */
*type1 = 1;
addr = (bus << 16) | (device_fn << 8) | (where);
}
*pci_addr = addr;
DBG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
return 0;
}
static unsigned int conf_read(unsigned long addr, unsigned char type1)
{
unsigned long flags;
unsigned int stat0, value;
unsigned int cia_cfg = 0; /* to keep gcc quiet */
save_flags(flags); /* avoid getting hit by machine check */
cli();
DBG(("conf_read(addr=0x%lx, type1=%d)\n", addr, type1));
/* reset status register to avoid losing errors: */
stat0 = *((volatile unsigned int *)CIA_IOC_CIA_ERR);
*((volatile unsigned int *)CIA_IOC_CIA_ERR) = stat0;
mb();
DBG(("conf_read: CIA ERR was 0x%x\n", stat0));
/* if Type1 access, must set CIA CFG */
if (type1) {
cia_cfg = *((unsigned int *)CIA_IOC_CFG);
mb();
*((unsigned int *)CIA_IOC_CFG) = cia_cfg | 1;
DBG(("conf_read: TYPE1 access\n"));
}
mb();
draina();
CIA_mcheck_expected = 1;
CIA_mcheck_taken = 0;
mb();
/* access configuration space: */
value = *((volatile unsigned int *)addr);
mb();
mb();
if (CIA_mcheck_taken) {
CIA_mcheck_taken = 0;
value = 0xffffffffU;
mb();
}
CIA_mcheck_expected = 0;
mb();
/*
* david.rusling@reo.mts.dec.com. This code is needed for the
* EB64+ as it does not generate a machine check (why I don't
* know). When we build kernels for one particular platform
* then we can make this conditional on the type.
*/
#if 0
draina();
/* now look for any errors */
stat0 = *((unsigned int *)CIA_IOC_CIA_ERR);
DBG(("conf_read: CIA ERR after read 0x%x\n", stat0));
if (stat0 & 0x8280U) { /* is any error bit set? */
/* if not NDEV, print status */
if (!(stat0 & 0x0080)) {
printk("CIA.c:conf_read: got stat0=%x\n", stat0);
}
/* reset error status: */
*((volatile unsigned long *)CIA_IOC_CIA_ERR) = stat0;
mb();
wrmces(0x7); /* reset machine check */
value = 0xffffffff;
}
#endif
/* if Type1 access, must reset IOC CFG so normal IO space ops work */
if (type1) {
*((unsigned int *)CIA_IOC_CFG) = cia_cfg & ~1;
mb();
}
DBG(("conf_read(): finished\n"));
restore_flags(flags);
return value;
}
static void conf_write(unsigned long addr, unsigned int value, unsigned char type1)
{
unsigned long flags;
unsigned int stat0;
unsigned int cia_cfg = 0; /* to keep gcc quiet */
save_flags(flags); /* avoid getting hit by machine check */
cli();
/* reset status register to avoid losing errors: */
stat0 = *((volatile unsigned int *)CIA_IOC_CIA_ERR);
*((volatile unsigned int *)CIA_IOC_CIA_ERR) = stat0;
mb();
DBG(("conf_write: CIA ERR was 0x%x\n", stat0));
/* if Type1 access, must set CIA CFG */
if (type1) {
cia_cfg = *((unsigned int *)CIA_IOC_CFG);
mb();
*((unsigned int *)CIA_IOC_CFG) = cia_cfg | 1;
DBG(("conf_read: TYPE1 access\n"));
}
draina();
CIA_mcheck_expected = 1;
mb();
/* access configuration space: */
*((volatile unsigned int *)addr) = value;
mb();
mb();
CIA_mcheck_expected = 0;
mb();
/*
* david.rusling@reo.mts.dec.com. This code is needed for the
* EB64+ as it does not generate a machine check (why I don't
* know). When we build kernels for one particular platform
* then we can make this conditional on the type.
*/
#if 0
draina();
/* now look for any errors */
stat0 = *((unsigned int *)CIA_IOC_CIA_ERR);
DBG(("conf_write: CIA ERR after write 0x%x\n", stat0));
if (stat0 & 0x8280U) { /* is any error bit set? */
/* if not NDEV, print status */
if (!(stat0 & 0x0080)) {
printk("CIA.c:conf_read: got stat0=%x\n", stat0);
}
/* reset error status: */
*((volatile unsigned long *)CIA_IOC_CIA_ERR) = stat0;
mb();
wrmces(0x7); /* reset machine check */
value = 0xffffffff;
}
#endif
/* if Type1 access, must reset IOC CFG so normal IO space ops work */
if (type1) {
*((unsigned int *)CIA_IOC_CFG) = cia_cfg & ~1;
mb();
}
DBG(("conf_write(): finished\n"));
restore_flags(flags);
}
int pcibios_read_config_byte (unsigned char bus, unsigned char device_fn,
unsigned char where, unsigned char *value)
{
unsigned long addr = CIA_CONF;
unsigned long pci_addr;
unsigned char type1;
*value = 0xff;
if (mk_conf_addr(bus, device_fn, where, &pci_addr, &type1) < 0) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x00;
*value = conf_read(addr, type1) >> ((where & 3) * 8);
return PCIBIOS_SUCCESSFUL;
}
int pcibios_read_config_word (unsigned char bus, unsigned char device_fn,
unsigned char where, unsigned short *value)
{
unsigned long addr = CIA_CONF;
unsigned long pci_addr;
unsigned char type1;
*value = 0xffff;
if (where & 0x1) {
return PCIBIOS_BAD_REGISTER_NUMBER;
}
if (mk_conf_addr(bus, device_fn, where, &pci_addr, &type1)) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x08;
*value = conf_read(addr, type1) >> ((where & 3) * 8);
return PCIBIOS_SUCCESSFUL;
}
int pcibios_read_config_dword (unsigned char bus, unsigned char device_fn,
unsigned char where, unsigned int *value)
{
unsigned long addr = CIA_CONF;
unsigned long pci_addr;
unsigned char type1;
*value = 0xffffffff;
if (where & 0x3) {
return PCIBIOS_BAD_REGISTER_NUMBER;
}
if (mk_conf_addr(bus, device_fn, where, &pci_addr, &type1)) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x18;
*value = conf_read(addr, type1);
return PCIBIOS_SUCCESSFUL;
}
int pcibios_write_config_byte (unsigned char bus, unsigned char device_fn,
unsigned char where, unsigned char value)
{
unsigned long addr = CIA_CONF;
unsigned long pci_addr;
unsigned char type1;
if (mk_conf_addr(bus, device_fn, where, &pci_addr, &type1) < 0) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x00;
conf_write(addr, value << ((where & 3) * 8), type1);
return PCIBIOS_SUCCESSFUL;
}
int pcibios_write_config_word (unsigned char bus, unsigned char device_fn,
unsigned char where, unsigned short value)
{
unsigned long addr = CIA_CONF;
unsigned long pci_addr;
unsigned char type1;
if (mk_conf_addr(bus, device_fn, where, &pci_addr, &type1) < 0) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x08;
conf_write(addr, value << ((where & 3) * 8), type1);
return PCIBIOS_SUCCESSFUL;
}
int pcibios_write_config_dword (unsigned char bus, unsigned char device_fn,
unsigned char where, unsigned int value)
{
unsigned long addr = CIA_CONF;
unsigned long pci_addr;
unsigned char type1;
if (mk_conf_addr(bus, device_fn, where, &pci_addr, &type1) < 0) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x18;
conf_write(addr, value << ((where & 3) * 8), type1);
return PCIBIOS_SUCCESSFUL;
}
unsigned long cia_init(unsigned long mem_start, unsigned long mem_end)
{
unsigned int cia_err ;
/*
* Set up error reporting.
*/
cia_err = *(vuip)CIA_IOC_CIA_ERR ;
cia_err |= (0x1 << 7) ; /* master abort */
*(vuip)CIA_IOC_CIA_ERR = cia_err ;
mb() ;
/*
* Set up the PCI->physical memory translation windows.
* For now, windows 1,2 and 3 are disabled. In the future, we may
* want to use them to do scatter/gather DMA. Window 0
* goes at 1 GB and is 1 GB large.
*/
*(vuip)CIA_IOC_PCI_W0_BASE = 1U | (CIA_DMA_WIN_BASE & 0xfff00000U);
*(vuip)CIA_IOC_PCI_W0_MASK = (CIA_DMA_WIN_SIZE - 1) & 0xfff00000U;
*(vuip)CIA_IOC_PCI_T0_BASE = 0;
*(vuip)CIA_IOC_PCI_W1_BASE = 0x0 ;
*(vuip)CIA_IOC_PCI_W2_BASE = 0x0 ;
*(vuip)CIA_IOC_PCI_W3_BASE = 0x0 ;
/*
* check ASN in HWRPB for validity, report if bad
*/
if (hwrpb->max_asn != MAX_ASN) {
printk("CIA_init: max ASN from HWRPB is bad (0x%lx)\n",
hwrpb->max_asn);
hwrpb->max_asn = MAX_ASN;
}
/*
* Finally, clear the CIA_CFG register, which gets used
* for PCI Config Space accesses. That is the way
* we want to use it, and we do not want to depend on
* what ARC or SRM might have left behind...
*/
{
#if 0
unsigned int cia_cfg = *((unsigned int *)CIA_IOC_CFG); mb();
if (cia_cfg) printk("CIA_init: CFG was 0x%x\n", cia_cfg);
#endif
*((unsigned int *)CIA_IOC_CFG) = 0; mb();
}
return mem_start;
}
int cia_pci_clr_err(void)
{
CIA_jd = *((unsigned int *)CIA_IOC_CIA_ERR);
DBG(("CIA_pci_clr_err: CIA ERR after read 0x%x\n", CIA_jd));
*((unsigned long *)CIA_IOC_CIA_ERR) = 0x0080;
mb();
return 0;
}
void cia_machine_check(unsigned long vector, unsigned long la_ptr,
struct pt_regs * regs)
{
#if 0
printk("CIA machine check ignored\n") ;
#else
struct el_common *mchk_header;
struct el_CIA_sysdata_mcheck *mchk_sysdata;
mchk_header = (struct el_common *)la_ptr;
mchk_sysdata =
(struct el_CIA_sysdata_mcheck *)(la_ptr + mchk_header->sys_offset);
DBG(("cia_machine_check: vector=0x%lx la_ptr=0x%lx\n", vector, la_ptr));
DBG((" pc=0x%lx size=0x%x procoffset=0x%x sysoffset 0x%x\n",
regs->pc, mchk_header->size, mchk_header->proc_offset, mchk_header->sys_offset));
DBG(("cia_machine_check: expected %d DCSR 0x%lx PEAR 0x%lx\n",
CIA_mcheck_expected, mchk_sysdata->epic_dcsr, mchk_sysdata->epic_pear));
#ifdef DEBUG
{
unsigned long *ptr;
int i;
ptr = (unsigned long *)la_ptr;
for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
printk(" +%lx %lx %lx\n", i*sizeof(long), ptr[i], ptr[i+1]);
}
}
#endif /* DEBUG */
/*
* Check if machine check is due to a badaddr() and if so,
* ignore the machine check.
*/
mb();
mb();
if (CIA_mcheck_expected/* && (mchk_sysdata->epic_dcsr && 0x0c00UL)*/) {
DBG(("CIA machine check expected\n"));
CIA_mcheck_expected = 0;
CIA_mcheck_taken = 1;
mb();
mb();
draina();
cia_pci_clr_err();
wrmces(0x7);
mb();
}
#if 1
else
printk("CIA machine check NOT expected\n") ;
#endif
#endif
}
#endif /* CONFIG_ALPHA_CIA */
