// SPDX-License-Identifier: GPL-2.0 /* * linux/arch/alpha/kernel/sys_rawhide.c * * Copyright (C) 1995 David A Rusling * Copyright (C) 1996 Jay A Estabrook * Copyright (C) 1998, 1999 Richard Henderson * * Code supporting the RAWHIDE. */ #include <linux/kernel.h> #include <linux/types.h> #include <linux/mm.h> #include <linux/sched.h> #include <linux/pci.h> #include <linux/init.h> #include <asm/ptrace.h> #include <asm/dma.h> #include <asm/irq.h> #include <asm/mmu_context.h> #include <asm/io.h> #include <asm/pgtable.h> #include <asm/core_mcpcia.h> #include <asm/tlbflush.h> #include "proto.h" #include "irq_impl.h" #include "pci_impl.h" #include "machvec_impl.h" /* * HACK ALERT! only the boot cpu is used for interrupts. */ /* Note mask bit is true for ENABLED irqs. */ static unsigned int hose_irq_masks[4] = { 0xff0000, 0xfe0000, 0xff0000, 0xff0000 }; static unsigned int cached_irq_masks[4]; DEFINE_SPINLOCK(rawhide_irq_lock); static inline void rawhide_update_irq_hw(int hose, int mask) { *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(hose)) = mask; mb(); *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(hose)); } #define hose_exists(h) \ (((h) < MCPCIA_MAX_HOSES) && (cached_irq_masks[(h)] != 0)) static inline void rawhide_enable_irq(struct irq_data *d) { unsigned int mask, hose; unsigned int irq = d->irq; irq -= 16; hose = irq / 24; if (!hose_exists(hose)) /* if hose non-existent, exit */ return; irq -= hose * 24; mask = 1 << irq; spin_lock(&rawhide_irq_lock); mask |= cached_irq_masks[hose]; cached_irq_masks[hose] = mask; rawhide_update_irq_hw(hose, mask); spin_unlock(&rawhide_irq_lock); } static void rawhide_disable_irq(struct irq_data *d) { unsigned int mask, hose; unsigned int irq = d->irq; irq -= 16; hose = irq / 24; if (!hose_exists(hose)) /* if hose non-existent, exit */ return; irq -= hose * 24; mask = ~(1 << irq) | hose_irq_masks[hose]; spin_lock(&rawhide_irq_lock); mask &= cached_irq_masks[hose]; cached_irq_masks[hose] = mask; rawhide_update_irq_hw(hose, mask); spin_unlock(&rawhide_irq_lock); } static void rawhide_mask_and_ack_irq(struct irq_data *d) { unsigned int mask, mask1, hose; unsigned int irq = d->irq; irq -= 16; hose = irq / 24; if (!hose_exists(hose)) /* if hose non-existent, exit */ return; irq -= hose * 24; mask1 = 1 << irq; mask = ~mask1 | hose_irq_masks[hose]; spin_lock(&rawhide_irq_lock); mask &= cached_irq_masks[hose]; cached_irq_masks[hose] = mask; rawhide_update_irq_hw(hose, mask); /* Clear the interrupt. */ *(vuip)MCPCIA_INT_REQ(MCPCIA_HOSE2MID(hose)) = mask1; spin_unlock(&rawhide_irq_lock); } static struct irq_chip rawhide_irq_type = { .name = "RAWHIDE", .irq_unmask = rawhide_enable_irq, .irq_mask = rawhide_disable_irq, .irq_mask_ack = rawhide_mask_and_ack_irq, }; static void rawhide_srm_device_interrupt(unsigned long vector) { int irq; irq = (vector - 0x800) >> 4; /* * The RAWHIDE SRM console reports PCI interrupts with a vector * 0x80 *higher* than one might expect, as PCI IRQ 0 (ie bit 0) * shows up as IRQ 24, etc, etc. We adjust it down by 8 to have * it line up with the actual bit numbers from the REQ registers, * which is how we manage the interrupts/mask. Sigh... * * Also, PCI #1 interrupts are offset some more... :-( */ if (irq == 52) { /* SCSI on PCI1 is special. */ irq = 72; } /* Adjust by which hose it is from. */ irq -= ((irq + 16) >> 2) & 0x38; handle_irq(irq); } static void __init rawhide_init_irq(void) { struct pci_controller *hose; long i; mcpcia_init_hoses(); /* Clear them all; only hoses that exist will be non-zero. */ for (i = 0; i < MCPCIA_MAX_HOSES; i++) cached_irq_masks[i] = 0; for (hose = hose_head; hose; hose = hose->next) { unsigned int h = hose->index; unsigned int mask = hose_irq_masks[h]; cached_irq_masks[h] = mask; *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(h)) = mask; *(vuip)MCPCIA_INT_MASK1(MCPCIA_HOSE2MID(h)) = 0; } for (i = 16; i < 128; ++i) { irq_set_chip_and_handler(i, &rawhide_irq_type, handle_level_irq); irq_set_status_flags(i, IRQ_LEVEL); } init_i8259a_irqs(); common_init_isa_dma(); } /* * PCI Fixup configuration. * * Summary @ MCPCIA_PCI0_INT_REQ: * Bit Meaning * 0 Interrupt Line A from slot 2 PCI0 * 1 Interrupt Line B from slot 2 PCI0 * 2 Interrupt Line C from slot 2 PCI0 * 3 Interrupt Line D from slot 2 PCI0 * 4 Interrupt Line A from slot 3 PCI0 * 5 Interrupt Line B from slot 3 PCI0 * 6 Interrupt Line C from slot 3 PCI0 * 7 Interrupt Line D from slot 3 PCI0 * 8 Interrupt Line A from slot 4 PCI0 * 9 Interrupt Line B from slot 4 PCI0 * 10 Interrupt Line C from slot 4 PCI0 * 11 Interrupt Line D from slot 4 PCI0 * 12 Interrupt Line A from slot 5 PCI0 * 13 Interrupt Line B from slot 5 PCI0 * 14 Interrupt Line C from slot 5 PCI0 * 15 Interrupt Line D from slot 5 PCI0 * 16 EISA interrupt (PCI 0) or SCSI interrupt (PCI 1) * 17-23 NA * * IdSel * 1 EISA bridge (PCI bus 0 only) * 2 PCI option slot 2 * 3 PCI option slot 3 * 4 PCI option slot 4 * 5 PCI option slot 5 * */ static int rawhide_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) { static char irq_tab[5][5] = { /*INT INTA INTB INTC INTD */ { 16+16, 16+16, 16+16, 16+16, 16+16}, /* IdSel 1 SCSI PCI 1 */ { 16+ 0, 16+ 0, 16+ 1, 16+ 2, 16+ 3}, /* IdSel 2 slot 2 */ { 16+ 4, 16+ 4, 16+ 5, 16+ 6, 16+ 7}, /* IdSel 3 slot 3 */ { 16+ 8, 16+ 8, 16+ 9, 16+10, 16+11}, /* IdSel 4 slot 4 */ { 16+12, 16+12, 16+13, 16+14, 16+15} /* IdSel 5 slot 5 */ }; const long min_idsel = 1, max_idsel = 5, irqs_per_slot = 5; struct pci_controller *hose = dev->sysdata; int irq = COMMON_TABLE_LOOKUP; if (irq >= 0) irq += 24 * hose->index; return irq; } /* * The System Vector */ struct alpha_machine_vector rawhide_mv __initmv = { .vector_name = "Rawhide", DO_EV5_MMU, DO_DEFAULT_RTC, DO_MCPCIA_IO, .machine_check = mcpcia_machine_check, .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, .min_io_address = DEFAULT_IO_BASE, .min_mem_address = MCPCIA_DEFAULT_MEM_BASE, .pci_dac_offset = MCPCIA_DAC_OFFSET, .nr_irqs = 128, .device_interrupt = rawhide_srm_device_interrupt, .init_arch = mcpcia_init_arch, .init_irq = rawhide_init_irq, .init_rtc = common_init_rtc, .init_pci = common_init_pci, .kill_arch = NULL, .pci_map_irq = rawhide_map_irq, .pci_swizzle = common_swizzle, }; ALIAS_MV(rawhide)