// SPDX-License-Identifier: GPL-2.0/* * linux/arch/alpha/kernel/sys_marvel.c * * Marvel / IO7 support */ #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 <linux/bitops.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_marvel.h>#include <asm/hwrpb.h>#include <asm/tlbflush.h>#include <asm/vga.h> #include "proto.h"#include "err_impl.h"#include "irq_impl.h"#include "pci_impl.h"#include "machvec_impl.h" #if NR_IRQS < MARVEL_NR_IRQS# error NR_IRQS < MARVEL_NR_IRQS !!!#endif /* * Interrupt handling. */static void io7_device_interrupt(unsigned long vector){	unsigned int pid;	unsigned int irq; 	/*	 * Vector is 0x800 + (interrupt)	 *	 * where (interrupt) is:	 *	 *	...16|15 14|13     4|3 0	 *	-----+-----+--------+---	 *	  PE |  0  |   irq  | 0	 *	 * where (irq) is 	 *	 *       0x0800 - 0x0ff0	 - 0x0800 + (LSI id << 4)	 *	 0x1000 - 0x2ff0	 - 0x1000 + (MSI_DAT<8:0> << 4)	 */	pid = vector >> 16;	irq = ((vector & 0xffff) - 0x800) >> 4; 	irq += 16;				/* offset for legacy */	irq &= MARVEL_IRQ_VEC_IRQ_MASK;		/* not too many bits */	irq |= pid << MARVEL_IRQ_VEC_PE_SHIFT;	/* merge the pid     */ 	handle_irq(irq);} static volatile unsigned long *io7_get_irq_ctl(unsigned int irq, struct io7 **pio7){	volatile unsigned long *ctl;	unsigned int pid;	struct io7 *io7; 	pid = irq >> MARVEL_IRQ_VEC_PE_SHIFT; 	if (!(io7 = marvel_find_io7(pid))) {		printk(KERN_ERR 		       "%s for nonexistent io7 -- vec %x, pid %d\n",		       __func__, irq, pid);		return NULL;	} 	irq &= MARVEL_IRQ_VEC_IRQ_MASK;	/* isolate the vector    */	irq -= 16;			/* subtract legacy bias  */ 	if (irq >= 0x180) {		printk(KERN_ERR 		       "%s for invalid irq -- pid %d adjusted irq %x\n",		       __func__, pid, irq);		return NULL;	} 	ctl = &io7->csrs->PO7_LSI_CTL[irq & 0xff].csr; /* assume LSI */	if (irq >= 0x80)	     	/* MSI */		ctl = &io7->csrs->PO7_MSI_CTL[((irq - 0x80) >> 5) & 0x0f].csr; 	if (pio7) *pio7 = io7;	return ctl;} static voidio7_enable_irq(struct irq_data *d){	volatile unsigned long *ctl;	unsigned int irq = d->irq;	struct io7 *io7; 	ctl = io7_get_irq_ctl(irq, &io7);	if (!ctl || !io7) {		printk(KERN_ERR "%s: get_ctl failed for irq %x\n",		       __func__, irq);		return;	} 	raw_spin_lock(&io7->irq_lock);	*ctl |= 1UL << 24;	mb();	*ctl;	raw_spin_unlock(&io7->irq_lock);} static voidio7_disable_irq(struct irq_data *d){	volatile unsigned long *ctl;	unsigned int irq = d->irq;	struct io7 *io7; 	ctl = io7_get_irq_ctl(irq, &io7);	if (!ctl || !io7) {		printk(KERN_ERR "%s: get_ctl failed for irq %x\n",		       __func__, irq);		return;	} 	raw_spin_lock(&io7->irq_lock);	*ctl &= ~(1UL << 24);	mb();	*ctl;	raw_spin_unlock(&io7->irq_lock);} static voidmarvel_irq_noop(struct irq_data *d){	return;} static struct irq_chip marvel_legacy_irq_type = {	.name		= "LEGACY",	.irq_mask	= marvel_irq_noop,	.irq_unmask	= marvel_irq_noop,}; static struct irq_chip io7_lsi_irq_type = {	.name		= "LSI",	.irq_unmask	= io7_enable_irq,	.irq_mask	= io7_disable_irq,	.irq_mask_ack	= io7_disable_irq,}; static struct irq_chip io7_msi_irq_type = {	.name		= "MSI",	.irq_unmask	= io7_enable_irq,	.irq_mask	= io7_disable_irq,	.irq_ack	= marvel_irq_noop,}; static voidio7_redirect_irq(struct io7 *io7, 		 volatile unsigned long *csr, 		 unsigned int where){	unsigned long val;		val = *csr;	val &= ~(0x1ffUL << 24);		/* clear the target pid   */	val |= ((unsigned long)where << 24);	/* set the new target pid */		*csr = val;	mb();	*csr;} static void io7_redirect_one_lsi(struct io7 *io7, unsigned int which, unsigned int where){	unsigned long val; 	/*	 * LSI_CTL has target PID @ 14	 */	val = io7->csrs->PO7_LSI_CTL[which].csr;	val &= ~(0x1ffUL << 14);		/* clear the target pid */	val |= ((unsigned long)where << 14);	/* set the new target pid */ 	io7->csrs->PO7_LSI_CTL[which].csr = val;	mb();	io7->csrs->PO7_LSI_CTL[which].csr;} static void io7_redirect_one_msi(struct io7 *io7, unsigned int which, unsigned int where){	unsigned long val; 	/*	 * MSI_CTL has target PID @ 14	 */	val = io7->csrs->PO7_MSI_CTL[which].csr;	val &= ~(0x1ffUL << 14);		/* clear the target pid */	val |= ((unsigned long)where << 14);	/* set the new target pid */ 	io7->csrs->PO7_MSI_CTL[which].csr = val;	mb();	io7->csrs->PO7_MSI_CTL[which].csr;} static void __initinit_one_io7_lsi(struct io7 *io7, unsigned int which, unsigned int where){	/*	 * LSI_CTL has target PID @ 14	 */	io7->csrs->PO7_LSI_CTL[which].csr = ((unsigned long)where << 14);	mb();	io7->csrs->PO7_LSI_CTL[which].csr;} static void __initinit_one_io7_msi(struct io7 *io7, unsigned int which, unsigned int where){	/*	 * MSI_CTL has target PID @ 14	 */	io7->csrs->PO7_MSI_CTL[which].csr = ((unsigned long)where << 14);	mb();	io7->csrs->PO7_MSI_CTL[which].csr;} static void __initinit_io7_irqs(struct io7 *io7, 	      struct irq_chip *lsi_ops,	      struct irq_chip *msi_ops){	long base = (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT) + 16;	long i; 	printk("Initializing interrupts for IO7 at PE %u - base %lx\n",		io7->pe, base); 	/*	 * Where should interrupts from this IO7 go?	 *	 * They really should be sent to the local CPU to avoid having to	 * traverse the mesh, but if it's not an SMP kernel, they have to	 * go to the boot CPU. Send them all to the boot CPU for now,	 * as each secondary starts, it can redirect it's local device 	 * interrupts.	 */	printk("  Interrupts reported to CPU at PE %u\n", boot_cpuid); 	raw_spin_lock(&io7->irq_lock); 	/* set up the error irqs */	io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, boot_cpuid);	io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, boot_cpuid);	io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, boot_cpuid);	io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, boot_cpuid);	io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, boot_cpuid); 	/* Set up the lsi irqs.  */	for (i = 0; i < 128; ++i) {		irq_set_chip_and_handler(base + i, lsi_ops, handle_level_irq);		irq_set_status_flags(i, IRQ_LEVEL);	} 	/* Disable the implemented irqs in hardware.  */	for (i = 0; i < 0x60; ++i) 		init_one_io7_lsi(io7, i, boot_cpuid); 	init_one_io7_lsi(io7, 0x74, boot_cpuid);	init_one_io7_lsi(io7, 0x75, boot_cpuid);  	/* Set up the msi irqs.  */	for (i = 128; i < (128 + 512); ++i) {		irq_set_chip_and_handler(base + i, msi_ops, handle_level_irq);		irq_set_status_flags(i, IRQ_LEVEL);	} 	for (i = 0; i < 16; ++i)		init_one_io7_msi(io7, i, boot_cpuid); 	raw_spin_unlock(&io7->irq_lock);} static void __initmarvel_init_irq(void){	int i;	struct io7 *io7 = NULL; 	/* Reserve the legacy irqs.  */	for (i = 0; i < 16; ++i) {		irq_set_chip_and_handler(i, &marvel_legacy_irq_type,					 handle_level_irq);	} 	/* Init the io7 irqs.  */	for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )		init_io7_irqs(io7, &io7_lsi_irq_type, &io7_msi_irq_type);} static int marvel_map_irq(const struct pci_dev *cdev, u8 slot, u8 pin){	struct pci_dev *dev = (struct pci_dev *)cdev;	struct pci_controller *hose = dev->sysdata;	struct io7_port *io7_port = hose->sysdata;	struct io7 *io7 = io7_port->io7;	int msi_loc, msi_data_off;	u16 msg_ctl;	u16 msg_dat;	u8 intline; 	int irq; 	pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);	irq = intline; 	msi_loc = dev->msi_cap;	msg_ctl = 0;	if (msi_loc) 		pci_read_config_word(dev, msi_loc + PCI_MSI_FLAGS, &msg_ctl); 	if (msg_ctl & PCI_MSI_FLAGS_ENABLE) { 		msi_data_off = PCI_MSI_DATA_32;		if (msg_ctl & PCI_MSI_FLAGS_64BIT) 			msi_data_off = PCI_MSI_DATA_64;		pci_read_config_word(dev, msi_loc + msi_data_off, &msg_dat); 		irq = msg_dat & 0x1ff;		/* we use msg_data<8:0> */		irq += 0x80;			/* offset for lsi       */ #if 1		printk("PCI:%d:%d:%d (hose %d) is using MSI\n",		       dev->bus->number, 		       PCI_SLOT(dev->devfn), 		       PCI_FUNC(dev->devfn),		       hose->index);		printk("  %d message(s) from 0x%04x\n", 		       1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),		       msg_dat);		printk("  reporting on %d IRQ(s) from %d (0x%x)\n", 		       1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),		       (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT),		       (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT));#endif #if 0		pci_write_config_word(dev, msi_loc + PCI_MSI_FLAGS,				      msg_ctl & ~PCI_MSI_FLAGS_ENABLE);		pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);		irq = intline; 		printk("  forcing LSI interrupt on irq %d [0x%x]\n", irq, irq);#endif	} 	irq += 16;					/* offset for legacy */	irq |= io7->pe << MARVEL_IRQ_VEC_PE_SHIFT;	/* merge the pid     */ 	return irq; } static void __initmarvel_init_pci(void){	struct io7 *io7; 	marvel_register_error_handlers(); 	/* Indicate that we trust the console to configure things properly */	pci_set_flags(PCI_PROBE_ONLY);	common_init_pci();	locate_and_init_vga(NULL); 	/* Clear any io7 errors.  */	for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; ) 		io7_clear_errors(io7);} static void __initmarvel_init_rtc(void){	init_rtc_irq(NULL);} static voidmarvel_smp_callin(void){	int cpuid = hard_smp_processor_id();	struct io7 *io7 = marvel_find_io7(cpuid);	unsigned int i; 	if (!io7)		return; 	/* 	 * There is a local IO7 - redirect all of its interrupts here.	 */	printk("Redirecting IO7 interrupts to local CPU at PE %u\n", cpuid); 	/* Redirect the error IRQS here.  */	io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, cpuid);	io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, cpuid);	io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, cpuid);	io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, cpuid);	io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, cpuid); 	/* Redirect the implemented LSIs here.  */	for (i = 0; i < 0x60; ++i) 		io7_redirect_one_lsi(io7, i, cpuid); 	io7_redirect_one_lsi(io7, 0x74, cpuid);	io7_redirect_one_lsi(io7, 0x75, cpuid); 	/* Redirect the MSIs here.  */	for (i = 0; i < 16; ++i)		io7_redirect_one_msi(io7, i, cpuid);}/* * System Vectors */struct alpha_machine_vector marvel_ev7_mv __initmv = {	.vector_name		= "MARVEL/EV7",	DO_EV7_MMU,	.rtc_port		= 0x70,	.rtc_boot_cpu_only	= 1,	DO_MARVEL_IO,	.machine_check		= marvel_machine_check,	.max_isa_dma_address	= ALPHA_MAX_ISA_DMA_ADDRESS,	.min_io_address		= DEFAULT_IO_BASE,	.min_mem_address	= DEFAULT_MEM_BASE,	.pci_dac_offset		= IO7_DAC_OFFSET, 	.nr_irqs		= MARVEL_NR_IRQS,	.device_interrupt	= io7_device_interrupt, 	.agp_info		= marvel_agp_info, 	.smp_callin		= marvel_smp_callin,	.init_arch		= marvel_init_arch,	.init_irq		= marvel_init_irq,	.init_rtc		= marvel_init_rtc,	.init_pci		= marvel_init_pci,	.kill_arch		= marvel_kill_arch,	.pci_map_irq		= marvel_map_irq,	.pci_swizzle		= common_swizzle,};ALIAS_MV(marvel_ev7)