arch/alpha/kernel/sys_rawhide.c - linux - Git at Google

 // 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/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)
	// 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/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)