diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/alpha/kernel/core_mcpcia.c |
Initial import
Diffstat (limited to 'arch/alpha/kernel/core_mcpcia.c')
-rw-r--r-- | arch/alpha/kernel/core_mcpcia.c | 613 |
1 files changed, 613 insertions, 0 deletions
diff --git a/arch/alpha/kernel/core_mcpcia.c b/arch/alpha/kernel/core_mcpcia.c new file mode 100644 index 000000000..da7bcc372 --- /dev/null +++ b/arch/alpha/kernel/core_mcpcia.c @@ -0,0 +1,613 @@ +/* + * linux/arch/alpha/kernel/core_mcpcia.c + * + * Based on code written by David A Rusling (david.rusling@reo.mts.dec.com). + * + * Code common to all MCbus-PCI Adaptor core logic chipsets + */ + +#define __EXTERN_INLINE inline +#include <asm/io.h> +#include <asm/core_mcpcia.h> +#undef __EXTERN_INLINE + +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/sched.h> +#include <linux/init.h> +#include <linux/delay.h> + +#include <asm/ptrace.h> + +#include "proto.h" +#include "pci_impl.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. + */ + +/* + * BIOS32-style PCI interface: + */ + +#define DEBUG_CFG 0 + +#if DEBUG_CFG +# define DBG_CFG(args) printk args +#else +# define DBG_CFG(args) +#endif + +/* + * Given a bus, device, and function number, compute resulting + * configuration space address and setup the MCPCIA_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 unsigned int +conf_read(unsigned long addr, unsigned char type1, + struct pci_controller *hose) +{ + unsigned long flags; + unsigned long mid = MCPCIA_HOSE2MID(hose->index); + unsigned int stat0, value, cpu; + + cpu = smp_processor_id(); + + local_irq_save(flags); + + DBG_CFG(("conf_read(addr=0x%lx, type1=%d, hose=%d)\n", + addr, type1, mid)); + + /* Reset status register to avoid losing errors. */ + stat0 = *(vuip)MCPCIA_CAP_ERR(mid); + *(vuip)MCPCIA_CAP_ERR(mid) = stat0; + mb(); + *(vuip)MCPCIA_CAP_ERR(mid); + DBG_CFG(("conf_read: MCPCIA_CAP_ERR(%d) was 0x%x\n", mid, stat0)); + + mb(); + draina(); + mcheck_expected(cpu) = 1; + mcheck_taken(cpu) = 0; + mcheck_extra(cpu) = mid; + mb(); + + /* Access configuration space. */ + value = *((vuip)addr); + mb(); + mb(); /* magic */ + + if (mcheck_taken(cpu)) { + mcheck_taken(cpu) = 0; + value = 0xffffffffU; + mb(); + } + mcheck_expected(cpu) = 0; + mb(); + + DBG_CFG(("conf_read(): finished\n")); + + local_irq_restore(flags); + return value; +} + +static void +conf_write(unsigned long addr, unsigned int value, unsigned char type1, + struct pci_controller *hose) +{ + unsigned long flags; + unsigned long mid = MCPCIA_HOSE2MID(hose->index); + unsigned int stat0, cpu; + + cpu = smp_processor_id(); + + local_irq_save(flags); /* avoid getting hit by machine check */ + + /* Reset status register to avoid losing errors. */ + stat0 = *(vuip)MCPCIA_CAP_ERR(mid); + *(vuip)MCPCIA_CAP_ERR(mid) = stat0; mb(); + *(vuip)MCPCIA_CAP_ERR(mid); + DBG_CFG(("conf_write: MCPCIA CAP_ERR(%d) was 0x%x\n", mid, stat0)); + + draina(); + mcheck_expected(cpu) = 1; + mcheck_extra(cpu) = mid; + mb(); + + /* Access configuration space. */ + *((vuip)addr) = value; + mb(); + mb(); /* magic */ + *(vuip)MCPCIA_CAP_ERR(mid); /* read to force the write */ + mcheck_expected(cpu) = 0; + mb(); + + DBG_CFG(("conf_write(): finished\n")); + local_irq_restore(flags); +} + +static int +mk_conf_addr(struct pci_bus *pbus, unsigned int devfn, int where, + struct pci_controller *hose, unsigned long *pci_addr, + unsigned char *type1) +{ + u8 bus = pbus->number; + unsigned long addr; + + DBG_CFG(("mk_conf_addr(bus=%d,devfn=0x%x,hose=%d,where=0x%x," + " pci_addr=0x%p, type1=0x%p)\n", + bus, devfn, hose->index, where, pci_addr, type1)); + + /* Type 1 configuration cycle for *ALL* busses. */ + *type1 = 1; + + if (!pbus->parent) /* No parent means peer PCI bus. */ + bus = 0; + addr = (bus << 16) | (devfn << 8) | (where); + addr <<= 5; /* swizzle for SPARSE */ + addr |= hose->config_space_base; + + *pci_addr = addr; + DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr)); + return 0; +} + +static int +mcpcia_read_config(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 *value) +{ + struct pci_controller *hose = bus->sysdata; + unsigned long addr, w; + unsigned char type1; + + if (mk_conf_addr(bus, devfn, where, hose, &addr, &type1)) + return PCIBIOS_DEVICE_NOT_FOUND; + + addr |= (size - 1) * 8; + w = conf_read(addr, type1, hose); + switch (size) { + case 1: + *value = __kernel_extbl(w, where & 3); + break; + case 2: + *value = __kernel_extwl(w, where & 3); + break; + case 4: + *value = w; + break; + } + return PCIBIOS_SUCCESSFUL; +} + +static int +mcpcia_write_config(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 value) +{ + struct pci_controller *hose = bus->sysdata; + unsigned long addr; + unsigned char type1; + + if (mk_conf_addr(bus, devfn, where, hose, &addr, &type1)) + return PCIBIOS_DEVICE_NOT_FOUND; + + addr |= (size - 1) * 8; + value = __kernel_insql(value, where & 3); + conf_write(addr, value, type1, hose); + return PCIBIOS_SUCCESSFUL; +} + +struct pci_ops mcpcia_pci_ops = +{ + .read = mcpcia_read_config, + .write = mcpcia_write_config, +}; + +void +mcpcia_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end) +{ + wmb(); + *(vuip)MCPCIA_SG_TBIA(MCPCIA_HOSE2MID(hose->index)) = 0; + mb(); +} + +static int __init +mcpcia_probe_hose(int h) +{ + int cpu = smp_processor_id(); + int mid = MCPCIA_HOSE2MID(h); + unsigned int pci_rev; + + /* Gotta be REAL careful. If hose is absent, we get an mcheck. */ + + mb(); + mb(); + draina(); + wrmces(7); + + mcheck_expected(cpu) = 2; /* indicates probing */ + mcheck_taken(cpu) = 0; + mcheck_extra(cpu) = mid; + mb(); + + /* Access the bus revision word. */ + pci_rev = *(vuip)MCPCIA_REV(mid); + + mb(); + mb(); /* magic */ + if (mcheck_taken(cpu)) { + mcheck_taken(cpu) = 0; + pci_rev = 0xffffffff; + mb(); + } + mcheck_expected(cpu) = 0; + mb(); + + return (pci_rev >> 16) == PCI_CLASS_BRIDGE_HOST; +} + +static void __init +mcpcia_new_hose(int h) +{ + struct pci_controller *hose; + struct resource *io, *mem, *hae_mem; + int mid = MCPCIA_HOSE2MID(h); + + hose = alloc_pci_controller(); + if (h == 0) + pci_isa_hose = hose; + io = alloc_resource(); + mem = alloc_resource(); + hae_mem = alloc_resource(); + + hose->io_space = io; + hose->mem_space = hae_mem; + hose->sparse_mem_base = MCPCIA_SPARSE(mid) - IDENT_ADDR; + hose->dense_mem_base = MCPCIA_DENSE(mid) - IDENT_ADDR; + hose->sparse_io_base = MCPCIA_IO(mid) - IDENT_ADDR; + hose->dense_io_base = 0; + hose->config_space_base = MCPCIA_CONF(mid); + hose->index = h; + + io->start = MCPCIA_IO(mid) - MCPCIA_IO_BIAS; + io->end = io->start + 0xffff; + io->name = pci_io_names[h]; + io->flags = IORESOURCE_IO; + + mem->start = MCPCIA_DENSE(mid) - MCPCIA_MEM_BIAS; + mem->end = mem->start + 0xffffffff; + mem->name = pci_mem_names[h]; + mem->flags = IORESOURCE_MEM; + + hae_mem->start = mem->start; + hae_mem->end = mem->start + MCPCIA_MEM_MASK; + hae_mem->name = pci_hae0_name; + hae_mem->flags = IORESOURCE_MEM; + + if (request_resource(&ioport_resource, io) < 0) + printk(KERN_ERR "Failed to request IO on hose %d\n", h); + if (request_resource(&iomem_resource, mem) < 0) + printk(KERN_ERR "Failed to request MEM on hose %d\n", h); + if (request_resource(mem, hae_mem) < 0) + printk(KERN_ERR "Failed to request HAE_MEM on hose %d\n", h); +} + +static void +mcpcia_pci_clr_err(int mid) +{ + *(vuip)MCPCIA_CAP_ERR(mid); + *(vuip)MCPCIA_CAP_ERR(mid) = 0xffffffff; /* Clear them all. */ + mb(); + *(vuip)MCPCIA_CAP_ERR(mid); /* Re-read for force write. */ +} + +static void __init +mcpcia_startup_hose(struct pci_controller *hose) +{ + int mid = MCPCIA_HOSE2MID(hose->index); + unsigned int tmp; + + mcpcia_pci_clr_err(mid); + + /* + * Set up error reporting. + */ + tmp = *(vuip)MCPCIA_CAP_ERR(mid); + tmp |= 0x0006; /* master/target abort */ + *(vuip)MCPCIA_CAP_ERR(mid) = tmp; + mb(); + tmp = *(vuip)MCPCIA_CAP_ERR(mid); + + /* + * Set up the PCI->physical memory translation windows. + * + * Window 0 is scatter-gather 8MB at 8MB (for isa) + * Window 1 is scatter-gather (up to) 1GB at 1GB (for pci) + * Window 2 is direct access 2GB at 2GB + */ + hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000, 0); + hose->sg_pci = iommu_arena_new(hose, 0x40000000, + size_for_memory(0x40000000), 0); + + __direct_map_base = 0x80000000; + __direct_map_size = 0x80000000; + + *(vuip)MCPCIA_W0_BASE(mid) = hose->sg_isa->dma_base | 3; + *(vuip)MCPCIA_W0_MASK(mid) = (hose->sg_isa->size - 1) & 0xfff00000; + *(vuip)MCPCIA_T0_BASE(mid) = virt_to_phys(hose->sg_isa->ptes) >> 8; + + *(vuip)MCPCIA_W1_BASE(mid) = hose->sg_pci->dma_base | 3; + *(vuip)MCPCIA_W1_MASK(mid) = (hose->sg_pci->size - 1) & 0xfff00000; + *(vuip)MCPCIA_T1_BASE(mid) = virt_to_phys(hose->sg_pci->ptes) >> 8; + + *(vuip)MCPCIA_W2_BASE(mid) = __direct_map_base | 1; + *(vuip)MCPCIA_W2_MASK(mid) = (__direct_map_size - 1) & 0xfff00000; + *(vuip)MCPCIA_T2_BASE(mid) = 0; + + *(vuip)MCPCIA_W3_BASE(mid) = 0x0; + + mcpcia_pci_tbi(hose, 0, -1); + + *(vuip)MCPCIA_HBASE(mid) = 0x0; + mb(); + + *(vuip)MCPCIA_HAE_MEM(mid) = 0U; + mb(); + *(vuip)MCPCIA_HAE_MEM(mid); /* read it back. */ + *(vuip)MCPCIA_HAE_IO(mid) = 0; + mb(); + *(vuip)MCPCIA_HAE_IO(mid); /* read it back. */ +} + +void __init +mcpcia_init_arch(void) +{ + /* With multiple PCI busses, we play with I/O as physical addrs. */ + ioport_resource.end = ~0UL; + + /* Allocate hose 0. That's the one that all the ISA junk hangs + off of, from which we'll be registering stuff here in a bit. + Other hose detection is done in mcpcia_init_hoses, which is + called from init_IRQ. */ + + mcpcia_new_hose(0); +} + +/* This is called from init_IRQ, since we cannot take interrupts + before then. Which means we cannot do this in init_arch. */ + +void __init +mcpcia_init_hoses(void) +{ + struct pci_controller *hose; + int hose_count; + int h; + + /* First, find how many hoses we have. */ + hose_count = 0; + for (h = 0; h < MCPCIA_MAX_HOSES; ++h) { + if (mcpcia_probe_hose(h)) { + if (h != 0) + mcpcia_new_hose(h); + hose_count++; + } + } + + printk("mcpcia_init_hoses: found %d hoses\n", hose_count); + + /* Now do init for each hose. */ + for (hose = hose_head; hose; hose = hose->next) + mcpcia_startup_hose(hose); +} + +static void +mcpcia_print_uncorrectable(struct el_MCPCIA_uncorrected_frame_mcheck *logout) +{ + struct el_common_EV5_uncorrectable_mcheck *frame; + int i; + + frame = &logout->procdata; + + /* Print PAL fields */ + for (i = 0; i < 24; i += 2) { + printk(" paltmp[%d-%d] = %16lx %16lx\n", + i, i+1, frame->paltemp[i], frame->paltemp[i+1]); + } + for (i = 0; i < 8; i += 2) { + printk(" shadow[%d-%d] = %16lx %16lx\n", + i, i+1, frame->shadow[i], + frame->shadow[i+1]); + } + printk(" Addr of excepting instruction = %16lx\n", + frame->exc_addr); + printk(" Summary of arithmetic traps = %16lx\n", + frame->exc_sum); + printk(" Exception mask = %16lx\n", + frame->exc_mask); + printk(" Base address for PALcode = %16lx\n", + frame->pal_base); + printk(" Interrupt Status Reg = %16lx\n", + frame->isr); + printk(" CURRENT SETUP OF EV5 IBOX = %16lx\n", + frame->icsr); + printk(" I-CACHE Reg %s parity error = %16lx\n", + (frame->ic_perr_stat & 0x800L) ? + "Data" : "Tag", + frame->ic_perr_stat); + printk(" D-CACHE error Reg = %16lx\n", + frame->dc_perr_stat); + if (frame->dc_perr_stat & 0x2) { + switch (frame->dc_perr_stat & 0x03c) { + case 8: + printk(" Data error in bank 1\n"); + break; + case 4: + printk(" Data error in bank 0\n"); + break; + case 20: + printk(" Tag error in bank 1\n"); + break; + case 10: + 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); + } +} |