/*
* Code common to all LCA chips.
*
* Written by David Mosberger (davidm@cs.arizona.edu) with some code
* taken from Dave Rusling's (david.rusling@reo.mts.dec.com) 32-bit
* bios code.
*/
#include <linux/kernel.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/bios32.h>
#include <linux/pci.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/io.h>
/*
* BIOS32-style PCI interface:
*/
#ifdef CONFIG_ALPHA_LCA
#define vulp volatile unsigned long *
/*
* Machine check reasons. Defined according to PALcode sources
* (osf.h and platform.h).
*/
#define MCHK_K_TPERR 0x0080
#define MCHK_K_TCPERR 0x0082
#define MCHK_K_HERR 0x0084
#define MCHK_K_ECC_C 0x0086
#define MCHK_K_ECC_NC 0x0088
#define MCHK_K_UNKNOWN 0x008A
#define MCHK_K_CACKSOFT 0x008C
#define MCHK_K_BUGCHECK 0x008E
#define MCHK_K_OS_BUGCHECK 0x0090
#define MCHK_K_DCPERR 0x0092
#define MCHK_K_ICPERR 0x0094
/*
* Platform-specific machine-check reasons:
*/
#define MCHK_K_SIO_SERR 0x204 /* all platforms so far */
#define MCHK_K_SIO_IOCHK 0x206 /* all platforms so far */
#define MCHK_K_DCSR 0x208 /* all but Noname */
/*
* Given a bus, device, and function number, compute resulting
* configuration space address and setup the LCA_IOC_CONF 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | | | | | | | | | | | | | | | | | | | | | | |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 long addr;
if (bus == 0) {
int device = device_fn >> 3;
int func = device_fn & 0x7;
/* type 0 configuration cycle: */
if (device > 12) {
return -1;
}
*((volatile unsigned long*) LCA_IOC_CONF) = 0;
addr = (1 << (11 + device)) | (func << 8) | where;
} else {
/* type 1 configuration cycle: */
*((volatile unsigned long*) LCA_IOC_CONF) = 1;
addr = (bus << 16) | (device_fn << 8) | where;
}
*pci_addr = addr;
return 0;
}
static unsigned int conf_read(unsigned long addr)
{
unsigned long flags, code, stat0;
unsigned int value;
save_flags(flags);
cli();
/* reset status register to avoid loosing errors: */
stat0 = *((volatile unsigned long*)LCA_IOC_STAT0);
*((volatile unsigned long*)LCA_IOC_STAT0) = stat0;
mb();
/* access configuration space: */
value = *((volatile unsigned int*)addr);
draina();
stat0 = *((unsigned long*)LCA_IOC_STAT0);
if (stat0 & LCA_IOC_STAT0_ERR) {
code = ((stat0 >> LCA_IOC_STAT0_CODE_SHIFT)
& LCA_IOC_STAT0_CODE_MASK);
if (code != 1) {
printk("lca.c:conf_read: got stat0=%lx\n", stat0);
}
/* reset error status: */
*((volatile unsigned long*)LCA_IOC_STAT0) = stat0;
mb();
wrmces(0x7); /* reset machine check */
value = 0xffffffff;
}
restore_flags(flags);
return value;
}
static void conf_write(unsigned long addr, unsigned int value)
{
unsigned long flags, code, stat0;
save_flags(flags); /* avoid getting hit by machine check */
cli();
/* reset status register to avoid loosing errors: */
stat0 = *((volatile unsigned long*)LCA_IOC_STAT0);
*((volatile unsigned long*)LCA_IOC_STAT0) = stat0;
mb();
/* access configuration space: */
*((volatile unsigned int*)addr) = value;
draina();
stat0 = *((unsigned long*)LCA_IOC_STAT0);
if (stat0 & LCA_IOC_STAT0_ERR) {
code = ((stat0 >> LCA_IOC_STAT0_CODE_SHIFT)
& LCA_IOC_STAT0_CODE_MASK);
if (code != 1) {
printk("lca.c:conf_write: got stat0=%lx\n", stat0);
}
/* reset error status: */
*((volatile unsigned long*)LCA_IOC_STAT0) = stat0;
mb();
wrmces(0x7); /* reset machine check */
}
restore_flags(flags);
}
int pcibios_read_config_byte (unsigned char bus, unsigned char device_fn,
unsigned char where, unsigned char *value)
{
unsigned long addr = LCA_CONF;
unsigned long pci_addr;
*value = 0xff;
if (mk_conf_addr(bus, device_fn, where, &pci_addr) < 0) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x00;
*value = conf_read(addr) >> ((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 = LCA_CONF;
unsigned long pci_addr;
*value = 0xffff;
if (where & 0x1) {
return PCIBIOS_BAD_REGISTER_NUMBER;
}
if (mk_conf_addr(bus, device_fn, where, &pci_addr)) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x08;
*value = conf_read(addr) >> ((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 = LCA_CONF;
unsigned long pci_addr;
*value = 0xffffffff;
if (where & 0x3) {
return PCIBIOS_BAD_REGISTER_NUMBER;
}
if (mk_conf_addr(bus, device_fn, where, &pci_addr)) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x18;
*value = conf_read(addr);
return PCIBIOS_SUCCESSFUL;
}
int pcibios_write_config_byte (unsigned char bus, unsigned char device_fn,
unsigned char where, unsigned char value)
{
unsigned long addr = LCA_CONF;
unsigned long pci_addr;
if (mk_conf_addr(bus, device_fn, where, &pci_addr) < 0) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x00;
conf_write(addr, value << ((where & 3) * 8));
return PCIBIOS_SUCCESSFUL;
}
int pcibios_write_config_word (unsigned char bus, unsigned char device_fn,
unsigned char where, unsigned short value)
{
unsigned long addr = LCA_CONF;
unsigned long pci_addr;
if (mk_conf_addr(bus, device_fn, where, &pci_addr) < 0) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x08;
conf_write(addr, value << ((where & 3) * 8));
return PCIBIOS_SUCCESSFUL;
}
int pcibios_write_config_dword (unsigned char bus, unsigned char device_fn,
unsigned char where, unsigned int value)
{
unsigned long addr = LCA_CONF;
unsigned long pci_addr;
if (mk_conf_addr(bus, device_fn, where, &pci_addr) < 0) {
return PCIBIOS_SUCCESSFUL;
}
addr |= (pci_addr << 5) + 0x18;
conf_write(addr, value << ((where & 3) * 8));
return PCIBIOS_SUCCESSFUL;
}
unsigned long lca_init(unsigned long mem_start, unsigned long mem_end)
{
/*
* Set up the PCI->physical memory translation windows.
* For now, window 1 is disabled. In the future, we may
* want to use it to do scatter/gather DMA. Window 0
* goes at 1 GB and is 1 GB large.
*/
*(vulp)LCA_IOC_W_BASE1 = 0UL<<33;
*(vulp)LCA_IOC_W_BASE0 = 1UL<<33 | LCA_DMA_WIN_BASE;
*(vulp)LCA_IOC_W_MASK0 = LCA_DMA_WIN_SIZE - 1;
*(vulp)LCA_IOC_T_BASE0 = 0;
/*
* Disable PCI parity for now. The NCR53c810 chip has
* troubles meeting the PCI spec which results in
* data parity errors.
*/
*(vulp)LCA_IOC_PAR_DIS = 1UL<<5;
return mem_start;
}
/*
* Constants used during machine-check handling. I suppose these
* could be moved into lca.h but I don't see much reason why anybody
* else would want to use them.
*/
#define ESR_EAV (1UL<< 0) /* error address valid */
#define ESR_CEE (1UL<< 1) /* correctable error */
#define ESR_UEE (1UL<< 2) /* uncorrectable error */
#define ESR_WRE (1UL<< 3) /* write-error */
#define ESR_SOR (1UL<< 4) /* error source */
#define ESR_CTE (1UL<< 7) /* cache-tag error */
#define ESR_MSE (1UL<< 9) /* multiple soft errors */
#define ESR_MHE (1UL<<10) /* multiple hard errors */
#define ESR_NXM (1UL<<12) /* non-existent memory */
#define IOC_ERR ( 1<<4) /* ioc logs an error */
#define IOC_CMD_SHIFT 0
#define IOC_CMD (0xf<<IOC_CMD_SHIFT)
#define IOC_CODE_SHIFT 8
#define IOC_CODE (0xf<<IOC_CODE_SHIFT)
#define IOC_LOST ( 1<<5)
#define IOC_P_NBR ((__u32) ~((1<<13) - 1))
void mem_error (unsigned long esr, unsigned long ear)
{
printk(" %s %s error to %s occurred at address %x\n",
(esr & ESR_CEE) ? "Correctable" : ((esr & ESR_UEE) ? "Uncorrectable" : "A"),
(esr & ESR_WRE) ? "write" : "read",
(esr & ESR_SOR) ? "memory" : "b-cache",
(unsigned) (ear & 0x1ffffff8));
if (esr & ESR_CTE) {
printk(" A b-cache tag parity error was detected.\n");
}
if (esr & ESR_MSE) {
printk(" Several other correctable errors occurred.\n");
}
if (esr & ESR_MHE) {
printk(" Several other uncorrectable errors occurred.\n");
}
if (esr & ESR_NXM) {
printk(" Attempted to access non-existent memory.\n");
}
}
void ioc_error (__u32 stat0, __u32 stat1)
{
const char *pci_cmd[] = {
"Interrupt Acknowledge", "Special", "I/O Read", "I/O Write",
"Rsvd 1", "Rsvd 2", "Memory Read", "Memory Write", "Rsvd3", "Rsvd4",
"Configuration Read", "Configuration Write", "Memory Read Multiple",
"Dual Address", "Memory Read Line", "Memory Write and Invalidate"
};
const char *err_name[] = {
"exceeded retry limit", "no device", "bad data parity", "target abort",
"bad address parity", "page table read error", "invalid page", "data error"
};
unsigned code = (stat0 & IOC_CODE) >> IOC_CODE_SHIFT;
unsigned cmd = (stat0 & IOC_CMD) >> IOC_CMD_SHIFT;
printk(" %s initiated PCI %s cycle to address %x failed due to %s.\n",
code > 3 ? "PCI" : "CPU", pci_cmd[cmd], stat1, err_name[code]);
if (code == 5 || code == 6) {
printk(" (Error occurred at PCI memory address %x.)\n", (stat0 & ~IOC_P_NBR));
}
if (stat0 & IOC_LOST) {
printk(" Other PCI errors occurred simultaneously.\n");
}
}
void lca_machine_check (unsigned long vector, unsigned long la, struct pt_regs *regs)
{
const char * reason;
union el_lca el;
char buf[128];
printk("lca: machine check (la=0x%lx,pc=0x%lx)\n", la, regs->pc);
el.c = (struct el_common *) la;
/*
* The first quadword after the common header always seems to
* be the machine check reason---don't know why this isn't
* part of the common header instead. In the case of a long
* logout frame, the upper 32 bits is the machine check
* revision level, which we ignore for now.
*/
switch (el.s->reason & 0xffffffff) {
case MCHK_K_TPERR: reason = "tag parity error"; break;
case MCHK_K_TCPERR: reason = "tag something parity error"; break;
case MCHK_K_HERR: reason = "access to non-existent memory"; break;
case MCHK_K_ECC_C: reason = "correctable ECC error"; break;
case MCHK_K_ECC_NC: reason = "non-correctable ECC error"; break;
case MCHK_K_CACKSOFT: reason = "MCHK_K_CACKSOFT"; break; /* what's this? */
case MCHK_K_BUGCHECK: reason = "illegal exception in PAL mode"; break;
case MCHK_K_OS_BUGCHECK: reason = "callsys in kernel mode"; break;
case MCHK_K_DCPERR: reason = "d-cache parity error"; break;
case MCHK_K_ICPERR: reason = "i-cache parity error"; break;
case MCHK_K_SIO_SERR: reason = "SIO SERR occurred on on PCI bus"; break;
case MCHK_K_SIO_IOCHK: reason = "SIO IOCHK occurred on ISA bus"; break;
case MCHK_K_DCSR: reason = "MCHK_K_DCSR"; break;
case MCHK_K_UNKNOWN:
default:
sprintf(buf, "reason for machine-check unknown (0x%lx)",
el.s->reason & 0xffffffff);
reason = buf;
break;
}
wrmces(rdmces()); /* reset machine check pending flag */
switch (el.c->size) {
case sizeof(struct el_lca_mcheck_short):
printk(" Reason: %s (short frame%s, dc_stat=%lx):\n",
reason, el.c->retry ? ", retryable" : "", el.s->dc_stat);
if (el.s->esr & ESR_EAV) {
mem_error(el.s->esr, el.s->ear);
}
if (el.s->ioc_stat0 & IOC_ERR) {
ioc_error(el.s->ioc_stat0, el.s->ioc_stat1);
}
break;
case sizeof(struct el_lca_mcheck_long):
printk(" Reason: %s (long frame%s):\n",
reason, el.c->retry ? ", retryable" : "");
printk(" reason: %lx exc_addr: %lx dc_stat: %lx\n",
el.l->pt[0], el.l->exc_addr, el.l->dc_stat);
printk(" car: %lx\n", el.l->car);
if (el.l->esr & ESR_EAV) {
mem_error(el.l->esr, el.l->ear);
}
if (el.l->ioc_stat0 & IOC_ERR) {
ioc_error(el.l->ioc_stat0, el.l->ioc_stat1);
}
break;
default:
printk(" Unknown errorlog size %d\n", el.c->size);
}
}
#endif /* CONFIG_ALPHA_LCA */
