// 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 0 x800 + ( interrupt )
*
* where ( interrupt ) is :
*
* . . . 16 | 15 14 | 13 4 | 3 0
* - - - - - + - - - - - + - - - - - - - - + - - -
* PE | 0 | irq | 0
*
* where ( irq ) is
*
* 0 x0800 - 0 x0ff0 - 0 x0800 + ( LSI id < < 4 )
* 0 x1000 - 0 x2ff0 - 0 x1000 + ( MSI_DAT < 8 : 0 > < < 4 )
*/
pid = vector >> 16 ;
irq = ((vector & 0 xffff) - 0 x800) >> 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 >= 0 x180) {
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 & 0 xff].csr; /* assume LSI */
if (irq >= 0 x80) /* MSI */
ctl = &io7->csrs->PO7_MSI_CTL[((irq - 0 x80) >> 5 ) & 0 x0f].csr;
if (pio7) *pio7 = io7;
return ctl;
}
static void
io7_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 |= 1 UL << 24 ;
mb();
*ctl;
raw_spin_unlock(&io7->irq_lock);
}
static void
io7_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 &= ~(1 UL << 24 );
mb();
*ctl;
raw_spin_unlock(&io7->irq_lock);
}
static void
marvel_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 void
io7_redirect_irq(struct io7 *io7,
volatile unsigned long *csr,
unsigned int where)
{
unsigned long val;
val = *csr;
val &= ~(0 x1ffUL << 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 &= ~(0 x1ffUL << 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 &= ~(0 x1ffUL << 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 __init
init_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 __init
init_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 __init
init_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 < 0 x60; ++i)
init_one_io7_lsi(io7, i, boot_cpuid);
init_one_io7_lsi(io7, 0 x74, boot_cpuid);
init_one_io7_lsi(io7, 0 x75, 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 __init
marvel_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 & 0 x1ff; /* we use msg_data<8:0> */
irq += 0 x80; /* 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 __init
marvel_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 __init
marvel_init_rtc(void )
{
init_rtc_irq(NULL);
}
static void
marvel_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 < 0 x60; ++i)
io7_redirect_one_lsi(io7, i, cpuid);
io7_redirect_one_lsi(io7, 0 x74, cpuid);
io7_redirect_one_lsi(io7, 0 x75, 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 = 0 x70,
.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)
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