615 lines
16 KiB
C
615 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/alpha/kernel/core_mcpcia.c
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*
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* Based on code written by David A Rusling (david.rusling@reo.mts.dec.com).
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*
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* Code common to all MCbus-PCI Adaptor core logic chipsets
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*/
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#define __EXTERN_INLINE inline
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#include <asm/io.h>
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#include <asm/core_mcpcia.h>
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#undef __EXTERN_INLINE
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <asm/ptrace.h>
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#include "proto.h"
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#include "pci_impl.h"
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/*
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* NOTE: Herein lie back-to-back mb instructions. They are magic.
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* One plausible explanation is that the i/o controller does not properly
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* handle the system transaction. Another involves timing. Ho hum.
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*/
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/*
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* BIOS32-style PCI interface:
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*/
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#define DEBUG_CFG 0
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#if DEBUG_CFG
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# define DBG_CFG(args) printk args
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#else
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# define DBG_CFG(args)
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#endif
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/*
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* Given a bus, device, and function number, compute resulting
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* configuration space address and setup the MCPCIA_HAXR2 register
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* accordingly. It is therefore not safe to have concurrent
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* invocations to configuration space access routines, but there
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* really shouldn't be any need for this.
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*
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* Type 0:
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*
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* 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | | |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|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* 31:11 Device select bit.
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* 10:8 Function number
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* 7:2 Register number
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*
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* Type 1:
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*
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* 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* 31:24 reserved
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* 23:16 bus number (8 bits = 128 possible buses)
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* 15:11 Device number (5 bits)
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* 10:8 function number
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* 7:2 register number
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*
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* Notes:
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* The function number selects which function of a multi-function device
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* (e.g., SCSI and Ethernet).
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*
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* The register selects a DWORD (32 bit) register offset. Hence it
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* doesn't get shifted by 2 bits as we want to "drop" the bottom two
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* bits.
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*/
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static unsigned int
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conf_read(unsigned long addr, unsigned char type1,
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struct pci_controller *hose)
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{
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unsigned long flags;
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unsigned long mid = MCPCIA_HOSE2MID(hose->index);
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unsigned int stat0, value, cpu;
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cpu = smp_processor_id();
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local_irq_save(flags);
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DBG_CFG(("conf_read(addr=0x%lx, type1=%d, hose=%d)\n",
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addr, type1, mid));
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/* Reset status register to avoid losing errors. */
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stat0 = *(vuip)MCPCIA_CAP_ERR(mid);
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*(vuip)MCPCIA_CAP_ERR(mid) = stat0;
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mb();
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*(vuip)MCPCIA_CAP_ERR(mid);
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DBG_CFG(("conf_read: MCPCIA_CAP_ERR(%d) was 0x%x\n", mid, stat0));
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mb();
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draina();
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mcheck_expected(cpu) = 1;
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mcheck_taken(cpu) = 0;
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mcheck_extra(cpu) = mid;
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mb();
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/* Access configuration space. */
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value = *((vuip)addr);
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mb();
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mb(); /* magic */
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if (mcheck_taken(cpu)) {
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mcheck_taken(cpu) = 0;
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value = 0xffffffffU;
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mb();
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}
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mcheck_expected(cpu) = 0;
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mb();
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DBG_CFG(("conf_read(): finished\n"));
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local_irq_restore(flags);
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return value;
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}
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static void
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conf_write(unsigned long addr, unsigned int value, unsigned char type1,
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struct pci_controller *hose)
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{
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unsigned long flags;
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unsigned long mid = MCPCIA_HOSE2MID(hose->index);
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unsigned int stat0, cpu;
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cpu = smp_processor_id();
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local_irq_save(flags); /* avoid getting hit by machine check */
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/* Reset status register to avoid losing errors. */
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stat0 = *(vuip)MCPCIA_CAP_ERR(mid);
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*(vuip)MCPCIA_CAP_ERR(mid) = stat0; mb();
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*(vuip)MCPCIA_CAP_ERR(mid);
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DBG_CFG(("conf_write: MCPCIA CAP_ERR(%d) was 0x%x\n", mid, stat0));
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draina();
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mcheck_expected(cpu) = 1;
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mcheck_extra(cpu) = mid;
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mb();
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/* Access configuration space. */
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*((vuip)addr) = value;
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mb();
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mb(); /* magic */
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*(vuip)MCPCIA_CAP_ERR(mid); /* read to force the write */
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mcheck_expected(cpu) = 0;
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mb();
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DBG_CFG(("conf_write(): finished\n"));
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local_irq_restore(flags);
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}
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static int
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mk_conf_addr(struct pci_bus *pbus, unsigned int devfn, int where,
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struct pci_controller *hose, unsigned long *pci_addr,
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unsigned char *type1)
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{
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u8 bus = pbus->number;
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unsigned long addr;
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DBG_CFG(("mk_conf_addr(bus=%d,devfn=0x%x,hose=%d,where=0x%x,"
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" pci_addr=0x%p, type1=0x%p)\n",
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bus, devfn, hose->index, where, pci_addr, type1));
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/* Type 1 configuration cycle for *ALL* busses. */
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*type1 = 1;
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if (!pbus->parent) /* No parent means peer PCI bus. */
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bus = 0;
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addr = (bus << 16) | (devfn << 8) | (where);
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addr <<= 5; /* swizzle for SPARSE */
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addr |= hose->config_space_base;
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*pci_addr = addr;
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DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
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return 0;
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}
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static int
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mcpcia_read_config(struct pci_bus *bus, unsigned int devfn, int where,
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int size, u32 *value)
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{
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struct pci_controller *hose = bus->sysdata;
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unsigned long addr, w;
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unsigned char type1;
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if (mk_conf_addr(bus, devfn, where, hose, &addr, &type1))
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return PCIBIOS_DEVICE_NOT_FOUND;
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addr |= (size - 1) * 8;
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w = conf_read(addr, type1, hose);
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switch (size) {
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case 1:
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*value = __kernel_extbl(w, where & 3);
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break;
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case 2:
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*value = __kernel_extwl(w, where & 3);
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break;
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case 4:
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*value = w;
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break;
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}
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return PCIBIOS_SUCCESSFUL;
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}
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static int
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mcpcia_write_config(struct pci_bus *bus, unsigned int devfn, int where,
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int size, u32 value)
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{
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struct pci_controller *hose = bus->sysdata;
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unsigned long addr;
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unsigned char type1;
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if (mk_conf_addr(bus, devfn, where, hose, &addr, &type1))
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return PCIBIOS_DEVICE_NOT_FOUND;
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addr |= (size - 1) * 8;
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value = __kernel_insql(value, where & 3);
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conf_write(addr, value, type1, hose);
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return PCIBIOS_SUCCESSFUL;
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}
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struct pci_ops mcpcia_pci_ops =
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{
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.read = mcpcia_read_config,
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.write = mcpcia_write_config,
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};
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void
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mcpcia_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end)
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{
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wmb();
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*(vuip)MCPCIA_SG_TBIA(MCPCIA_HOSE2MID(hose->index)) = 0;
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mb();
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}
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static int __init
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mcpcia_probe_hose(int h)
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{
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int cpu = smp_processor_id();
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int mid = MCPCIA_HOSE2MID(h);
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unsigned int pci_rev;
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/* Gotta be REAL careful. If hose is absent, we get an mcheck. */
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mb();
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mb();
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draina();
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wrmces(7);
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mcheck_expected(cpu) = 2; /* indicates probing */
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mcheck_taken(cpu) = 0;
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mcheck_extra(cpu) = mid;
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mb();
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/* Access the bus revision word. */
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pci_rev = *(vuip)MCPCIA_REV(mid);
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mb();
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mb(); /* magic */
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if (mcheck_taken(cpu)) {
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mcheck_taken(cpu) = 0;
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pci_rev = 0xffffffff;
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mb();
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}
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mcheck_expected(cpu) = 0;
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mb();
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return (pci_rev >> 16) == PCI_CLASS_BRIDGE_HOST;
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}
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static void __init
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mcpcia_new_hose(int h)
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{
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struct pci_controller *hose;
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struct resource *io, *mem, *hae_mem;
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int mid = MCPCIA_HOSE2MID(h);
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hose = alloc_pci_controller();
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if (h == 0)
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pci_isa_hose = hose;
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io = alloc_resource();
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mem = alloc_resource();
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hae_mem = alloc_resource();
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hose->io_space = io;
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hose->mem_space = hae_mem;
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hose->sparse_mem_base = MCPCIA_SPARSE(mid) - IDENT_ADDR;
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hose->dense_mem_base = MCPCIA_DENSE(mid) - IDENT_ADDR;
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hose->sparse_io_base = MCPCIA_IO(mid) - IDENT_ADDR;
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hose->dense_io_base = 0;
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hose->config_space_base = MCPCIA_CONF(mid);
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hose->index = h;
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io->start = MCPCIA_IO(mid) - MCPCIA_IO_BIAS;
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io->end = io->start + 0xffff;
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io->name = pci_io_names[h];
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io->flags = IORESOURCE_IO;
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mem->start = MCPCIA_DENSE(mid) - MCPCIA_MEM_BIAS;
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mem->end = mem->start + 0xffffffff;
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mem->name = pci_mem_names[h];
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mem->flags = IORESOURCE_MEM;
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hae_mem->start = mem->start;
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hae_mem->end = mem->start + MCPCIA_MEM_MASK;
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hae_mem->name = pci_hae0_name;
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hae_mem->flags = IORESOURCE_MEM;
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if (request_resource(&ioport_resource, io) < 0)
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printk(KERN_ERR "Failed to request IO on hose %d\n", h);
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if (request_resource(&iomem_resource, mem) < 0)
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printk(KERN_ERR "Failed to request MEM on hose %d\n", h);
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if (request_resource(mem, hae_mem) < 0)
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printk(KERN_ERR "Failed to request HAE_MEM on hose %d\n", h);
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}
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static void
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mcpcia_pci_clr_err(int mid)
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{
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*(vuip)MCPCIA_CAP_ERR(mid);
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*(vuip)MCPCIA_CAP_ERR(mid) = 0xffffffff; /* Clear them all. */
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mb();
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*(vuip)MCPCIA_CAP_ERR(mid); /* Re-read for force write. */
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}
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static void __init
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mcpcia_startup_hose(struct pci_controller *hose)
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{
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int mid = MCPCIA_HOSE2MID(hose->index);
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unsigned int tmp;
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mcpcia_pci_clr_err(mid);
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/*
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* Set up error reporting.
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*/
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tmp = *(vuip)MCPCIA_CAP_ERR(mid);
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tmp |= 0x0006; /* master/target abort */
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*(vuip)MCPCIA_CAP_ERR(mid) = tmp;
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mb();
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tmp = *(vuip)MCPCIA_CAP_ERR(mid);
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/*
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* Set up the PCI->physical memory translation windows.
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*
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* Window 0 is scatter-gather 8MB at 8MB (for isa)
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* Window 1 is scatter-gather (up to) 1GB at 1GB (for pci)
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* Window 2 is direct access 2GB at 2GB
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*/
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hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000, 0);
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hose->sg_pci = iommu_arena_new(hose, 0x40000000,
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size_for_memory(0x40000000), 0);
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__direct_map_base = 0x80000000;
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__direct_map_size = 0x80000000;
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*(vuip)MCPCIA_W0_BASE(mid) = hose->sg_isa->dma_base | 3;
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*(vuip)MCPCIA_W0_MASK(mid) = (hose->sg_isa->size - 1) & 0xfff00000;
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*(vuip)MCPCIA_T0_BASE(mid) = virt_to_phys(hose->sg_isa->ptes) >> 8;
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*(vuip)MCPCIA_W1_BASE(mid) = hose->sg_pci->dma_base | 3;
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*(vuip)MCPCIA_W1_MASK(mid) = (hose->sg_pci->size - 1) & 0xfff00000;
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*(vuip)MCPCIA_T1_BASE(mid) = virt_to_phys(hose->sg_pci->ptes) >> 8;
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*(vuip)MCPCIA_W2_BASE(mid) = __direct_map_base | 1;
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*(vuip)MCPCIA_W2_MASK(mid) = (__direct_map_size - 1) & 0xfff00000;
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*(vuip)MCPCIA_T2_BASE(mid) = 0;
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*(vuip)MCPCIA_W3_BASE(mid) = 0x0;
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mcpcia_pci_tbi(hose, 0, -1);
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*(vuip)MCPCIA_HBASE(mid) = 0x0;
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mb();
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*(vuip)MCPCIA_HAE_MEM(mid) = 0U;
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mb();
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*(vuip)MCPCIA_HAE_MEM(mid); /* read it back. */
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*(vuip)MCPCIA_HAE_IO(mid) = 0;
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mb();
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*(vuip)MCPCIA_HAE_IO(mid); /* read it back. */
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}
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void __init
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mcpcia_init_arch(void)
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{
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/* With multiple PCI busses, we play with I/O as physical addrs. */
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ioport_resource.end = ~0UL;
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/* Allocate hose 0. That's the one that all the ISA junk hangs
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off of, from which we'll be registering stuff here in a bit.
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Other hose detection is done in mcpcia_init_hoses, which is
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called from init_IRQ. */
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mcpcia_new_hose(0);
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}
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/* This is called from init_IRQ, since we cannot take interrupts
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before then. Which means we cannot do this in init_arch. */
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void __init
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mcpcia_init_hoses(void)
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{
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struct pci_controller *hose;
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int hose_count;
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int h;
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/* First, find how many hoses we have. */
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hose_count = 0;
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for (h = 0; h < MCPCIA_MAX_HOSES; ++h) {
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if (mcpcia_probe_hose(h)) {
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if (h != 0)
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mcpcia_new_hose(h);
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hose_count++;
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}
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}
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printk("mcpcia_init_hoses: found %d hoses\n", hose_count);
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/* Now do init for each hose. */
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for (hose = hose_head; hose; hose = hose->next)
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mcpcia_startup_hose(hose);
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}
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static void
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mcpcia_print_uncorrectable(struct el_MCPCIA_uncorrected_frame_mcheck *logout)
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{
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struct el_common_EV5_uncorrectable_mcheck *frame;
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int i;
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frame = &logout->procdata;
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/* Print PAL fields */
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for (i = 0; i < 24; i += 2) {
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printk(" paltmp[%d-%d] = %16lx %16lx\n",
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i, i+1, frame->paltemp[i], frame->paltemp[i+1]);
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}
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for (i = 0; i < 8; i += 2) {
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printk(" shadow[%d-%d] = %16lx %16lx\n",
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i, i+1, frame->shadow[i],
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frame->shadow[i+1]);
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}
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printk(" Addr of excepting instruction = %16lx\n",
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frame->exc_addr);
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printk(" Summary of arithmetic traps = %16lx\n",
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frame->exc_sum);
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printk(" Exception mask = %16lx\n",
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frame->exc_mask);
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printk(" Base address for PALcode = %16lx\n",
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frame->pal_base);
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printk(" Interrupt Status Reg = %16lx\n",
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frame->isr);
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printk(" CURRENT SETUP OF EV5 IBOX = %16lx\n",
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frame->icsr);
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printk(" I-CACHE Reg %s parity error = %16lx\n",
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(frame->ic_perr_stat & 0x800L) ?
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"Data" : "Tag",
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frame->ic_perr_stat);
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printk(" D-CACHE error Reg = %16lx\n",
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frame->dc_perr_stat);
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if (frame->dc_perr_stat & 0x2) {
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switch (frame->dc_perr_stat & 0x03c) {
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case 8:
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printk(" Data error in bank 1\n");
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break;
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case 4:
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printk(" Data error in bank 0\n");
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break;
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case 20:
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printk(" Tag error in bank 1\n");
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break;
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case 10:
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||
printk(" Tag error in bank 0\n");
|
||
break;
|
||
}
|
||
}
|
||
printk(" Effective VA = %16lx\n",
|
||
frame->va);
|
||
printk(" Reason for D-stream = %16lx\n",
|
||
frame->mm_stat);
|
||
printk(" EV5 SCache address = %16lx\n",
|
||
frame->sc_addr);
|
||
printk(" EV5 SCache TAG/Data parity = %16lx\n",
|
||
frame->sc_stat);
|
||
printk(" EV5 BC_TAG_ADDR = %16lx\n",
|
||
frame->bc_tag_addr);
|
||
printk(" EV5 EI_ADDR: Phys addr of Xfer = %16lx\n",
|
||
frame->ei_addr);
|
||
printk(" Fill Syndrome = %16lx\n",
|
||
frame->fill_syndrome);
|
||
printk(" EI_STAT reg = %16lx\n",
|
||
frame->ei_stat);
|
||
printk(" LD_LOCK = %16lx\n",
|
||
frame->ld_lock);
|
||
}
|
||
|
||
static void
|
||
mcpcia_print_system_area(unsigned long la_ptr)
|
||
{
|
||
struct el_common *frame;
|
||
struct pci_controller *hose;
|
||
|
||
struct IOD_subpacket {
|
||
unsigned long base;
|
||
unsigned int whoami;
|
||
unsigned int rsvd1;
|
||
unsigned int pci_rev;
|
||
unsigned int cap_ctrl;
|
||
unsigned int hae_mem;
|
||
unsigned int hae_io;
|
||
unsigned int int_ctl;
|
||
unsigned int int_reg;
|
||
unsigned int int_mask0;
|
||
unsigned int int_mask1;
|
||
unsigned int mc_err0;
|
||
unsigned int mc_err1;
|
||
unsigned int cap_err;
|
||
unsigned int rsvd2;
|
||
unsigned int pci_err1;
|
||
unsigned int mdpa_stat;
|
||
unsigned int mdpa_syn;
|
||
unsigned int mdpb_stat;
|
||
unsigned int mdpb_syn;
|
||
unsigned int rsvd3;
|
||
unsigned int rsvd4;
|
||
unsigned int rsvd5;
|
||
} *iodpp;
|
||
|
||
frame = (struct el_common *)la_ptr;
|
||
iodpp = (struct IOD_subpacket *) (la_ptr + frame->sys_offset);
|
||
|
||
for (hose = hose_head; hose; hose = hose->next, iodpp++) {
|
||
|
||
printk("IOD %d Register Subpacket - Bridge Base Address %16lx\n",
|
||
hose->index, iodpp->base);
|
||
printk(" WHOAMI = %8x\n", iodpp->whoami);
|
||
printk(" PCI_REV = %8x\n", iodpp->pci_rev);
|
||
printk(" CAP_CTRL = %8x\n", iodpp->cap_ctrl);
|
||
printk(" HAE_MEM = %8x\n", iodpp->hae_mem);
|
||
printk(" HAE_IO = %8x\n", iodpp->hae_io);
|
||
printk(" INT_CTL = %8x\n", iodpp->int_ctl);
|
||
printk(" INT_REG = %8x\n", iodpp->int_reg);
|
||
printk(" INT_MASK0 = %8x\n", iodpp->int_mask0);
|
||
printk(" INT_MASK1 = %8x\n", iodpp->int_mask1);
|
||
printk(" MC_ERR0 = %8x\n", iodpp->mc_err0);
|
||
printk(" MC_ERR1 = %8x\n", iodpp->mc_err1);
|
||
printk(" CAP_ERR = %8x\n", iodpp->cap_err);
|
||
printk(" PCI_ERR1 = %8x\n", iodpp->pci_err1);
|
||
printk(" MDPA_STAT = %8x\n", iodpp->mdpa_stat);
|
||
printk(" MDPA_SYN = %8x\n", iodpp->mdpa_syn);
|
||
printk(" MDPB_STAT = %8x\n", iodpp->mdpb_stat);
|
||
printk(" MDPB_SYN = %8x\n", iodpp->mdpb_syn);
|
||
}
|
||
}
|
||
|
||
void
|
||
mcpcia_machine_check(unsigned long vector, unsigned long la_ptr)
|
||
{
|
||
struct el_MCPCIA_uncorrected_frame_mcheck *mchk_logout;
|
||
unsigned int cpu = smp_processor_id();
|
||
int expected;
|
||
|
||
mchk_logout = (struct el_MCPCIA_uncorrected_frame_mcheck *)la_ptr;
|
||
expected = mcheck_expected(cpu);
|
||
|
||
mb();
|
||
mb(); /* magic */
|
||
draina();
|
||
|
||
switch (expected) {
|
||
case 0:
|
||
{
|
||
/* FIXME: how do we figure out which hose the
|
||
error was on? */
|
||
struct pci_controller *hose;
|
||
for (hose = hose_head; hose; hose = hose->next)
|
||
mcpcia_pci_clr_err(MCPCIA_HOSE2MID(hose->index));
|
||
break;
|
||
}
|
||
case 1:
|
||
mcpcia_pci_clr_err(mcheck_extra(cpu));
|
||
break;
|
||
default:
|
||
/* Otherwise, we're being called from mcpcia_probe_hose
|
||
and there's no hose clear an error from. */
|
||
break;
|
||
}
|
||
|
||
wrmces(0x7);
|
||
mb();
|
||
|
||
process_mcheck_info(vector, la_ptr, "MCPCIA", expected != 0);
|
||
if (!expected && vector != 0x620 && vector != 0x630) {
|
||
mcpcia_print_uncorrectable(mchk_logout);
|
||
mcpcia_print_system_area(la_ptr);
|
||
}
|
||
}
|