// 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)