patch-2.1.116 linux/arch/alpha/kernel/apecs.c
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- Lines: 623
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.1.115/linux/arch/alpha/kernel/apecs.c
- Orig date:
Wed Jun 24 22:54:02 1998
diff -u --recursive --new-file v2.1.115/linux/arch/alpha/kernel/apecs.c linux/arch/alpha/kernel/apecs.c
@@ -1,622 +0,0 @@
-/*
- * Code common to all APECS chips.
- *
- * Rewritten for Apecs from the lca.c from:
- *
- * 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/pci.h>
-
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/hwrpb.h>
-#include <asm/ptrace.h>
-
-/*
- * NOTE: Herein lie back-to-back mb instructions. They are magic.
- * One plausible explanation is that the i/o controller does not properly
- * handle the system transaction. Another involves timing. Ho hum.
- */
-
-extern struct hwrpb_struct *hwrpb;
-extern asmlinkage void wrmces(unsigned long mces);
-
-/*
- * BIOS32-style PCI interface:
- */
-
-#ifdef DEBUG
-# define DBG(args) printk args
-#else
-# define DBG(args)
-#endif
-
-#define vuip volatile unsigned int *
-
-static volatile unsigned int apecs_mcheck_expected = 0;
-static volatile unsigned int apecs_mcheck_taken = 0;
-static unsigned int apecs_jd, apecs_jd1, apecs_jd2;
-
-#ifdef CONFIG_ALPHA_SRM_SETUP
-unsigned int APECS_DMA_WIN_BASE = APECS_DMA_WIN_BASE_DEFAULT;
-unsigned int APECS_DMA_WIN_SIZE = APECS_DMA_WIN_SIZE_DEFAULT;
-#endif /* SRM_SETUP */
-
-/*
- * Given a bus, device, and function number, compute resulting
- * configuration space address and setup the APECS_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
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | | | | | | | | | | | | | | | | | | | | | | | |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 haxr2 = 0; /* to keep gcc quiet */
-
-#ifdef CONFIG_ALPHA_SRM
- /* some SRMs step on these registers during a machine check: */
- register long s0 asm ("9");
- register long s1 asm ("10");
- register long s2 asm ("11");
- register long s3 asm ("12");
- register long s4 asm ("13");
- register long s5 asm ("14");
- asm volatile ("# %0" : "r="(s0));
- asm volatile ("# %0" : "r="(s1));
- asm volatile ("# %0" : "r="(s2));
- asm volatile ("# %0" : "r="(s3));
- asm volatile ("# %0" : "r="(s4));
- asm volatile ("# %0" : "r="(s5));
-#endif
-
- 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 = *(vuip)APECS_IOC_DCSR;
- *(vuip)APECS_IOC_DCSR = stat0;
- mb();
- DBG(("conf_read: APECS DCSR was 0x%x\n", stat0));
- /* if Type1 access, must set HAE #2 */
- if (type1) {
- haxr2 = *(vuip)APECS_IOC_HAXR2;
- mb();
- *(vuip)APECS_IOC_HAXR2 = haxr2 | 1;
- DBG(("conf_read: TYPE1 access\n"));
- }
-
- draina();
- apecs_mcheck_expected = 1;
- apecs_mcheck_taken = 0;
- mb();
- /* access configuration space: */
- value = *(vuip)addr;
- mb();
- mb(); /* magic */
- if (apecs_mcheck_taken) {
- apecs_mcheck_taken = 0;
- value = 0xffffffffU;
- mb();
- }
- apecs_mcheck_expected = 0;
- mb();
-
-#if 1
- /*
- * 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.
- */
- draina();
-
- /* now look for any errors */
- stat0 = *(vuip)APECS_IOC_DCSR;
- DBG(("conf_read: APECS DCSR after read 0x%x\n", stat0));
- if (stat0 & 0xffe0U) { /* is any error bit set? */
- /* if not NDEV, print status */
- if (!(stat0 & 0x0800)) {
- printk("apecs.c:conf_read: got stat0=%x\n", stat0);
- }
-
- /* reset error status: */
- *(vuip)APECS_IOC_DCSR = stat0;
- mb();
- wrmces(0x7); /* reset machine check */
- value = 0xffffffff;
- }
-#endif
-
- /* if Type1 access, must reset HAE #2 so normal IO space ops work */
- if (type1) {
- *(vuip)APECS_IOC_HAXR2 = haxr2 & ~1;
- mb();
- }
- restore_flags(flags);
-#ifdef CONFIG_ALPHA_SRM
- /* some SRMs step on these registers during a machine check: */
- asm volatile ("# %0" :: "r"(s0));
- asm volatile ("# %0" :: "r"(s1));
- asm volatile ("# %0" :: "r"(s2));
- asm volatile ("# %0" :: "r"(s3));
- asm volatile ("# %0" :: "r"(s4));
- asm volatile ("# %0" :: "r"(s5));
-#endif
- return value;
-}
-
-
-static void conf_write(unsigned long addr, unsigned int value, unsigned char type1)
-{
- unsigned long flags;
- unsigned int stat0;
- unsigned int haxr2 = 0; /* to keep gcc quiet */
-
- save_flags(flags); /* avoid getting hit by machine check */
- cli();
-
- /* reset status register to avoid losing errors: */
- stat0 = *(vuip)APECS_IOC_DCSR;
- *(vuip)APECS_IOC_DCSR = stat0;
- mb();
-
- /* if Type1 access, must set HAE #2 */
- if (type1) {
- haxr2 = *(vuip)APECS_IOC_HAXR2;
- mb();
- *(vuip)APECS_IOC_HAXR2 = haxr2 | 1;
- }
-
- draina();
- apecs_mcheck_expected = 1;
- mb();
- /* access configuration space: */
- *(vuip)addr = value;
- mb();
- mb(); /* magic */
- apecs_mcheck_expected = 0;
- mb();
-
-#if 1
- /*
- * 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.
- */
- draina();
-
- /* now look for any errors */
- stat0 = *(vuip)APECS_IOC_DCSR;
- if (stat0 & 0xffe0U) { /* is any error bit set? */
- /* if not NDEV, print status */
- if (!(stat0 & 0x0800)) {
- printk("apecs.c:conf_write: got stat0=%x\n", stat0);
- }
-
- /* reset error status: */
- *(vuip)APECS_IOC_DCSR = stat0;
- mb();
- wrmces(0x7); /* reset machine check */
- }
-#endif
-
- /* if Type1 access, must reset HAE #2 so normal IO space ops work */
- if (type1) {
- *(vuip)APECS_IOC_HAXR2 = haxr2 & ~1;
- mb();
- }
- restore_flags(flags);
-}
-
-
-int pcibios_read_config_byte (unsigned char bus, unsigned char device_fn,
- unsigned char where, unsigned char *value)
-{
- unsigned long addr = APECS_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 = APECS_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 = APECS_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 = APECS_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 = APECS_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 = APECS_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 apecs_init(unsigned long mem_start, unsigned long mem_end)
-{
-
-#ifdef CONFIG_ALPHA_XL
- /*
- * Set up the PCI->physical memory translation windows.
- * For the XL we *must* use both windows, in order to
- * maximize the amount of physical memory that can be used
- * to DMA from the ISA bus, and still allow PCI bus devices
- * access to all of host memory.
- *
- * see <asm/apecs.h> for window bases and sizes.
- *
- * this restriction due to the true XL motherboards' 82379AB SIO
- * PCI<->ISA bridge chip which passes only 27 bits of address...
- */
-
- *(vuip)APECS_IOC_PB1R = 1U<<19 | (APECS_XL_DMA_WIN1_BASE & 0xfff00000U);
- *(vuip)APECS_IOC_PM1R = (APECS_XL_DMA_WIN1_SIZE - 1) & 0xfff00000U;
- *(vuip)APECS_IOC_TB1R = 0;
-
- *(vuip)APECS_IOC_PB2R = 1U<<19 | (APECS_XL_DMA_WIN2_BASE & 0xfff00000U);
- *(vuip)APECS_IOC_PM2R = (APECS_XL_DMA_WIN2_SIZE - 1) & 0xfff00000U;
- *(vuip)APECS_IOC_TB2R = 0;
-
-#else /* CONFIG_ALPHA_XL */
-#ifdef CONFIG_ALPHA_SRM_SETUP
- /* check window 1 for enabled and mapped to 0 */
- if ((*(vuip)APECS_IOC_PB1R & (1U<<19)) && (*(vuip)APECS_IOC_TB1R == 0))
- {
- APECS_DMA_WIN_BASE = *(vuip)APECS_IOC_PB1R & 0xfff00000U;
- APECS_DMA_WIN_SIZE = *(vuip)APECS_IOC_PM1R & 0xfff00000U;
- APECS_DMA_WIN_SIZE += 0x00100000U;
-#if 0
- printk("apecs_init: using Window 1 settings\n");
- printk("apecs_init: PB1R 0x%x PM1R 0x%x TB1R 0x%x\n",
- *(vuip)APECS_IOC_PB1R,
- *(vuip)APECS_IOC_PM1R,
- *(vuip)APECS_IOC_TB1R);
-#endif
- }
- else /* check window 2 for enabled and mapped to 0 */
- if ((*(vuip)APECS_IOC_PB2R & (1U<<19)) && (*(vuip)APECS_IOC_TB2R == 0))
- {
- APECS_DMA_WIN_BASE = *(vuip)APECS_IOC_PB2R & 0xfff00000U;
- APECS_DMA_WIN_SIZE = *(vuip)APECS_IOC_PM2R & 0xfff00000U;
- APECS_DMA_WIN_SIZE += 0x00100000U;
-#if 0
- printk("apecs_init: using Window 2 settings\n");
- printk("apecs_init: PB2R 0x%x PM2R 0x%x TB2R 0x%x\n",
- *(vuip)APECS_IOC_PB2R,
- *(vuip)APECS_IOC_PM2R,
- *(vuip)APECS_IOC_TB2R);
-#endif
- }
- else /* we must use our defaults... */
-#endif /* SRM_SETUP */
- {
- /*
- * Set up the PCI->physical memory translation windows.
- * For now, window 2 is disabled. In the future, we may
- * want to use it to do scatter/gather DMA. Window 1
- * goes at 1 GB and is 1 GB large.
- */
- *(vuip)APECS_IOC_PB2R = 0U; /* disable window 2 */
-
- *(vuip)APECS_IOC_PB1R = 1U<<19 | (APECS_DMA_WIN_BASE & 0xfff00000U);
- *(vuip)APECS_IOC_PM1R = (APECS_DMA_WIN_SIZE - 1) & 0xfff00000U;
- *(vuip)APECS_IOC_TB1R = 0;
- }
-#endif /* CONFIG_ALPHA_XL */
-
-#ifdef CONFIG_ALPHA_CABRIOLET
-#ifdef NO_LONGER_NEEDED_I_HOPE
- /*
- * JAE: HACK!!! for now, hardwire if configured...
- * davidm: Older miniloader versions don't set the clock frequency
- * right, so hardcode it for now.
- */
- if (hwrpb->sys_type == ST_DEC_EB64P) {
- hwrpb->sys_type = ST_DEC_EBPC64;
- }
- if (hwrpb->cycle_freq == 0) {
- hwrpb->cycle_freq = 275000000;
- }
-
- /* update checksum: */
- {
- unsigned long *l, sum;
-
- sum = 0;
- for (l = (unsigned long *) hwrpb;
- l < (unsigned long *) &hwrpb->chksum;
- ++l)
- sum += *l;
- hwrpb->chksum = sum;
- }
-#endif /* NO_LONGER_NEEDED_I_HOPE */
-#endif /* CONFIG_ALPHA_CABRIOLET */
-
- /*
- * Finally, clear the HAXR2 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 haxr2 = *(vuip)APECS_IOC_HAXR2; mb();
- if (haxr2) printk("apecs_init: HAXR2 was 0x%x\n", haxr2);
-#endif
- *(vuip)APECS_IOC_HAXR2 = 0; mb();
- }
-
-
- return mem_start;
-}
-
-int apecs_pci_clr_err(void)
-{
- apecs_jd = *(vuip)APECS_IOC_DCSR;
- if (apecs_jd & 0xffe0L) {
- apecs_jd1 = *(vuip)APECS_IOC_SEAR;
- *(vuip)APECS_IOC_DCSR = apecs_jd | 0xffe1L;
- apecs_jd = *(vuip)APECS_IOC_DCSR;
- mb();
- }
- *(vuip)APECS_IOC_TBIA = (unsigned int)APECS_IOC_TBIA;
- apecs_jd2 = *(vuip)APECS_IOC_TBIA;
- mb();
- return 0;
-}
-
-void apecs_machine_check(unsigned long vector, unsigned long la_ptr,
- struct pt_regs * regs)
-{
- struct el_common *mchk_header;
- struct el_procdata *mchk_procdata;
- struct el_apecs_sysdata_mcheck *mchk_sysdata;
- unsigned long *ptr;
- int i;
-
-
- mchk_header = (struct el_common *)la_ptr;
- mchk_procdata = (struct el_procdata *)
- (la_ptr + mchk_header->proc_offset - sizeof(mchk_procdata->paltemp));
- mchk_sysdata =
- (struct el_apecs_sysdata_mcheck *)(la_ptr + mchk_header->sys_offset);
-
-#ifdef DEBUG
- printk("apecs_machine_check: vector=0x%lx la_ptr=0x%lx\n",
- vector, la_ptr);
- printk(" 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);
- printk("apecs_machine_check: expected %d DCSR 0x%lx PEAR 0x%lx\n",
- apecs_mcheck_expected, mchk_sysdata->epic_dcsr,
- mchk_sysdata->epic_pear);
- 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.
- */
-#ifdef CONFIG_ALPHA_MIKASA
-#define MCHK_NO_DEVSEL 0x205L
-#define MCHK_NO_TABT 0x204L
- if (apecs_mcheck_expected &&
- (((unsigned int)mchk_header->code == MCHK_NO_DEVSEL) ||
- ((unsigned int)mchk_header->code == MCHK_NO_TABT))
- )
- {
-#else
- if (apecs_mcheck_expected && (mchk_sysdata->epic_dcsr && 0x0c00UL)) {
-#endif
- apecs_mcheck_expected = 0;
- apecs_mcheck_taken = 1;
- mb();
- mb(); /* magic */
- apecs_pci_clr_err();
- wrmces(0x7);
- mb();
- draina();
- DBG(("apecs_machine_check: EXPECTED\n"));
- }
- else if (vector == 0x620 || vector == 0x630) {
- wrmces(0x1f); /* disable correctable from now on */
- mb();
- draina();
- printk("apecs_machine_check: HW correctable (0x%lx)\n",
- vector);
- }
- else {
- printk(KERN_CRIT "APECS machine check:\n");
- printk(KERN_CRIT " vector=0x%lx la_ptr=0x%lx\n",
- vector, la_ptr);
- printk(KERN_CRIT
- " 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);
- printk(KERN_CRIT " expected %d DCSR 0x%lx PEAR 0x%lx\n",
- apecs_mcheck_expected, mchk_sysdata->epic_dcsr,
- mchk_sysdata->epic_pear);
-
- ptr = (unsigned long *)la_ptr;
- for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
- printk(KERN_CRIT " +%lx %lx %lx\n",
- i*sizeof(long), ptr[i], ptr[i+1]);
- }
-#if 0
- /* doesn't work with MILO */
- show_regs(regs);
-#endif
- }
-}
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