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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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04d8a9db89
The kernel.h macro DIV_ROUND_CLOSEST performs the computation (x + d/2)/d but is perhaps more readable. The semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @haskernel@ @@ @depends on haskernel@ expression x,__divisor; @@ - (((x) + ((__divisor) / 2)) / (__divisor)) + DIV_ROUND_CLOSEST(x,__divisor) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Matt Turner <mattst88@gmail.com>
242 lines
5.8 KiB
C
242 lines
5.8 KiB
C
/*
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* linux/arch/alpha/kernel/sys_ruffian.c
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*
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* Copyright (C) 1995 David A Rusling
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* Copyright (C) 1996 Jay A Estabrook
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* Copyright (C) 1998, 1999, 2000 Richard Henderson
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*
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* Code supporting the RUFFIAN.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/ioport.h>
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#include <linux/timex.h>
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#include <linux/init.h>
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#include <asm/ptrace.h>
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#include <asm/system.h>
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#include <asm/dma.h>
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#include <asm/irq.h>
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#include <asm/mmu_context.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/core_cia.h>
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#include <asm/tlbflush.h>
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#include <asm/8253pit.h>
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#include "proto.h"
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#include "irq_impl.h"
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#include "pci_impl.h"
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#include "machvec_impl.h"
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static void __init
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ruffian_init_irq(void)
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{
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/* Invert 6&7 for i82371 */
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*(vulp)PYXIS_INT_HILO = 0x000000c0UL; mb();
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*(vulp)PYXIS_INT_CNFG = 0x00002064UL; mb(); /* all clear */
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outb(0x11,0xA0);
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outb(0x08,0xA1);
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outb(0x02,0xA1);
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outb(0x01,0xA1);
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outb(0xFF,0xA1);
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outb(0x11,0x20);
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outb(0x00,0x21);
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outb(0x04,0x21);
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outb(0x01,0x21);
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outb(0xFF,0x21);
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/* Finish writing the 82C59A PIC Operation Control Words */
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outb(0x20,0xA0);
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outb(0x20,0x20);
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init_i8259a_irqs();
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/* Not interested in the bogus interrupts (0,3,6),
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NMI (1), HALT (2), flash (5), or 21142 (8). */
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init_pyxis_irqs(0x16f0000);
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common_init_isa_dma();
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}
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#define RUFFIAN_LATCH DIV_ROUND_CLOSEST(PIT_TICK_RATE, HZ)
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static void __init
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ruffian_init_rtc(void)
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{
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/* Ruffian does not have the RTC connected to the CPU timer
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interrupt. Instead, it uses the PIT connected to IRQ 0. */
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/* Setup interval timer. */
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outb(0x34, 0x43); /* binary, mode 2, LSB/MSB, ch 0 */
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outb(RUFFIAN_LATCH & 0xff, 0x40); /* LSB */
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outb(RUFFIAN_LATCH >> 8, 0x40); /* MSB */
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outb(0xb6, 0x43); /* pit counter 2: speaker */
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outb(0x31, 0x42);
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outb(0x13, 0x42);
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setup_irq(0, &timer_irqaction);
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}
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static void
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ruffian_kill_arch (int mode)
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{
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cia_kill_arch(mode);
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#if 0
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/* This only causes re-entry to ARCSBIOS */
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/* Perhaps this works for other PYXIS as well? */
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*(vuip) PYXIS_RESET = 0x0000dead;
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mb();
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#endif
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}
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/*
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* Interrupt routing:
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*
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* Primary bus
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* IdSel INTA INTB INTC INTD
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* 21052 13 - - - -
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* SIO 14 23 - - -
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* 21143 15 44 - - -
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* Slot 0 17 43 42 41 40
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*
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* Secondary bus
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* IdSel INTA INTB INTC INTD
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* Slot 0 8 (18) 19 18 17 16
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* Slot 1 9 (19) 31 30 29 28
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* Slot 2 10 (20) 27 26 25 24
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* Slot 3 11 (21) 39 38 37 36
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* Slot 4 12 (22) 35 34 33 32
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* 53c875 13 (23) 20 - - -
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*
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*/
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static int __init
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ruffian_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[11][5] __initdata = {
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/*INT INTA INTB INTC INTD */
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{-1, -1, -1, -1, -1}, /* IdSel 13, 21052 */
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{-1, -1, -1, -1, -1}, /* IdSel 14, SIO */
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{44, 44, 44, 44, 44}, /* IdSel 15, 21143 */
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{-1, -1, -1, -1, -1}, /* IdSel 16, none */
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{43, 43, 42, 41, 40}, /* IdSel 17, 64-bit slot */
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/* the next 6 are actually on PCI bus 1, across the bridge */
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{19, 19, 18, 17, 16}, /* IdSel 8, slot 0 */
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{31, 31, 30, 29, 28}, /* IdSel 9, slot 1 */
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{27, 27, 26, 25, 24}, /* IdSel 10, slot 2 */
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{39, 39, 38, 37, 36}, /* IdSel 11, slot 3 */
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{35, 35, 34, 33, 32}, /* IdSel 12, slot 4 */
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{20, 20, 20, 20, 20}, /* IdSel 13, 53c875 */
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};
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const long min_idsel = 13, max_idsel = 23, irqs_per_slot = 5;
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return COMMON_TABLE_LOOKUP;
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}
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static u8 __init
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ruffian_swizzle(struct pci_dev *dev, u8 *pinp)
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{
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int slot, pin = *pinp;
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if (dev->bus->number == 0) {
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slot = PCI_SLOT(dev->devfn);
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}
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/* Check for the built-in bridge. */
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else if (PCI_SLOT(dev->bus->self->devfn) == 13) {
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slot = PCI_SLOT(dev->devfn) + 10;
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}
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else
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{
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/* Must be a card-based bridge. */
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do {
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if (PCI_SLOT(dev->bus->self->devfn) == 13) {
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slot = PCI_SLOT(dev->devfn) + 10;
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break;
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}
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pin = pci_swizzle_interrupt_pin(dev, pin);
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/* Move up the chain of bridges. */
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dev = dev->bus->self;
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/* Slot of the next bridge. */
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slot = PCI_SLOT(dev->devfn);
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} while (dev->bus->self);
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}
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*pinp = pin;
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return slot;
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}
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#ifdef BUILDING_FOR_MILO
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/*
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* The DeskStation Ruffian motherboard firmware does not place
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* the memory size in the PALimpure area. Therefore, we use
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* the Bank Configuration Registers in PYXIS to obtain the size.
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*/
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static unsigned long __init
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ruffian_get_bank_size(unsigned long offset)
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{
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unsigned long bank_addr, bank, ret = 0;
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/* Valid offsets are: 0x800, 0x840 and 0x880
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since Ruffian only uses three banks. */
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bank_addr = (unsigned long)PYXIS_MCR + offset;
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bank = *(vulp)bank_addr;
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/* Check BANK_ENABLE */
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if (bank & 0x01) {
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static unsigned long size[] __initdata = {
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0x40000000UL, /* 0x00, 1G */
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0x20000000UL, /* 0x02, 512M */
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0x10000000UL, /* 0x04, 256M */
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0x08000000UL, /* 0x06, 128M */
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0x04000000UL, /* 0x08, 64M */
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0x02000000UL, /* 0x0a, 32M */
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0x01000000UL, /* 0x0c, 16M */
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0x00800000UL, /* 0x0e, 8M */
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0x80000000UL, /* 0x10, 2G */
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};
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bank = (bank & 0x1e) >> 1;
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if (bank < ARRAY_SIZE(size))
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ret = size[bank];
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}
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return ret;
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}
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#endif /* BUILDING_FOR_MILO */
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/*
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* The System Vector
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*/
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struct alpha_machine_vector ruffian_mv __initmv = {
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.vector_name = "Ruffian",
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DO_EV5_MMU,
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DO_DEFAULT_RTC,
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DO_PYXIS_IO,
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.machine_check = cia_machine_check,
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.max_isa_dma_address = ALPHA_RUFFIAN_MAX_ISA_DMA_ADDRESS,
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.min_io_address = DEFAULT_IO_BASE,
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.min_mem_address = DEFAULT_MEM_BASE,
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.pci_dac_offset = PYXIS_DAC_OFFSET,
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.nr_irqs = 48,
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.device_interrupt = pyxis_device_interrupt,
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.init_arch = pyxis_init_arch,
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.init_irq = ruffian_init_irq,
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.init_rtc = ruffian_init_rtc,
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.init_pci = cia_init_pci,
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.kill_arch = ruffian_kill_arch,
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.pci_map_irq = ruffian_map_irq,
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.pci_swizzle = ruffian_swizzle,
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};
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ALIAS_MV(ruffian)
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