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-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIVAwUAT3NKzROxKuMESys7AQKElw/+JyDxJSlj+g+nymkx8IVVuU8CsEwNLgRk 8KEnRfLhGtkXFLSJYWO6jzGo16F8Uqli1PdMFte/wagSv0285/HZaKlkkBVHdJ/m u40oSjgT013bBh6MQ0Oaf8pFezFUiQB5zPOA9QGaLVGDLXCmgqUgd7exaD5wRIwB ZmyItjZeAVnDfk1R+ZiNYytHAi8A5wSB+eFDCIQYgyulA1Igd1UnRtx+dRKbvc/m rWQ6KWbZHIdvP1ksd8wHHkrlUD2pEeJ8glJLsZUhMm/5oMf/8RmOCvmo8rvE/qwl eDQ1h4cGYlfjobxXZMHqAN9m7Jg2bI946HZjdb7/7oCeO6VW3FwPZ/Ic75p+wp45 HXJTItufERYk6QxShiOKvA+QexnYwY0IT5oRP4DrhdVB/X9cl2MoaZHC+RbYLQy+ /5VNZKi38iK4F9AbFamS7kd0i5QszA/ZzEzKZ6VMuOp3W/fagpn4ZJT1LIA3m4A9 Q0cj24mqeyCfjysu0TMbPtaN+Yjeu1o1OFRvM8XffbZsp5bNzuTDEvviJ2NXw4vK 4qUHulhYSEWcu9YgAZXvEWDEM78FXCkg2v/CrZXH5tyc95kUkMPcgG+QZBB5wElR FaOKpiC/BuNIGEf02IZQ4nfDxE90QwnDeoYeV+FvNj9UEOopJ5z5bMPoTHxm4cCD NypQthI85pc= =G9mT -----END PGP SIGNATURE----- Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system Pull "Disintegrate and delete asm/system.h" from David Howells: "Here are a bunch of patches to disintegrate asm/system.h into a set of separate bits to relieve the problem of circular inclusion dependencies. I've built all the working defconfigs from all the arches that I can and made sure that they don't break. The reason for these patches is that I recently encountered a circular dependency problem that came about when I produced some patches to optimise get_order() by rewriting it to use ilog2(). This uses bitops - and on the SH arch asm/bitops.h drags in asm-generic/get_order.h by a circuituous route involving asm/system.h. The main difficulty seems to be asm/system.h. It holds a number of low level bits with no/few dependencies that are commonly used (eg. memory barriers) and a number of bits with more dependencies that aren't used in many places (eg. switch_to()). These patches break asm/system.h up into the following core pieces: (1) asm/barrier.h Move memory barriers here. This already done for MIPS and Alpha. (2) asm/switch_to.h Move switch_to() and related stuff here. (3) asm/exec.h Move arch_align_stack() here. Other process execution related bits could perhaps go here from asm/processor.h. (4) asm/cmpxchg.h Move xchg() and cmpxchg() here as they're full word atomic ops and frequently used by atomic_xchg() and atomic_cmpxchg(). (5) asm/bug.h Move die() and related bits. (6) asm/auxvec.h Move AT_VECTOR_SIZE_ARCH here. Other arch headers are created as needed on a per-arch basis." Fixed up some conflicts from other header file cleanups and moving code around that has happened in the meantime, so David's testing is somewhat weakened by that. We'll find out anything that got broken and fix it.. * tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits) Delete all instances of asm/system.h Remove all #inclusions of asm/system.h Add #includes needed to permit the removal of asm/system.h Move all declarations of free_initmem() to linux/mm.h Disintegrate asm/system.h for OpenRISC Split arch_align_stack() out from asm-generic/system.h Split the switch_to() wrapper out of asm-generic/system.h Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h Create asm-generic/barrier.h Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] Disintegrate asm/system.h for Tile Disintegrate asm/system.h for Sparc Disintegrate asm/system.h for SH Disintegrate asm/system.h for Score Disintegrate asm/system.h for S390 Disintegrate asm/system.h for PowerPC Disintegrate asm/system.h for PA-RISC Disintegrate asm/system.h for MN10300 ...
394 lines
9.4 KiB
C
394 lines
9.4 KiB
C
/*
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* linux/arch/arm/kernel/dec21285.c: PCI functions for DC21285
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*
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* Copyright (C) 1998-2001 Russell King
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* Copyright (C) 1998-2000 Phil Blundell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <video/vga.h>
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#include <asm/irq.h>
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#include <asm/mach/pci.h>
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#include <asm/hardware/dec21285.h>
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#define MAX_SLOTS 21
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#define PCICMD_ABORT ((PCI_STATUS_REC_MASTER_ABORT| \
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PCI_STATUS_REC_TARGET_ABORT)<<16)
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#define PCICMD_ERROR_BITS ((PCI_STATUS_DETECTED_PARITY | \
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PCI_STATUS_REC_MASTER_ABORT | \
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PCI_STATUS_REC_TARGET_ABORT | \
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PCI_STATUS_PARITY) << 16)
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extern int setup_arm_irq(int, struct irqaction *);
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extern void pcibios_report_status(u_int status_mask, int warn);
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static unsigned long
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dc21285_base_address(struct pci_bus *bus, unsigned int devfn)
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{
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unsigned long addr = 0;
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if (bus->number == 0) {
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if (PCI_SLOT(devfn) == 0)
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/*
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* For devfn 0, point at the 21285
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*/
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addr = ARMCSR_BASE;
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else {
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devfn -= 1 << 3;
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if (devfn < PCI_DEVFN(MAX_SLOTS, 0))
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addr = PCICFG0_BASE | 0xc00000 | (devfn << 8);
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}
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} else
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addr = PCICFG1_BASE | (bus->number << 16) | (devfn << 8);
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return addr;
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}
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static int
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dc21285_read_config(struct pci_bus *bus, unsigned int devfn, int where,
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int size, u32 *value)
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{
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unsigned long addr = dc21285_base_address(bus, devfn);
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u32 v = 0xffffffff;
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if (addr)
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switch (size) {
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case 1:
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asm("ldrb %0, [%1, %2]"
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: "=r" (v) : "r" (addr), "r" (where) : "cc");
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break;
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case 2:
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asm("ldrh %0, [%1, %2]"
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: "=r" (v) : "r" (addr), "r" (where) : "cc");
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break;
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case 4:
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asm("ldr %0, [%1, %2]"
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: "=r" (v) : "r" (addr), "r" (where) : "cc");
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break;
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}
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*value = v;
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v = *CSR_PCICMD;
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if (v & PCICMD_ABORT) {
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*CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
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return -1;
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}
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return PCIBIOS_SUCCESSFUL;
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}
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static int
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dc21285_write_config(struct pci_bus *bus, unsigned int devfn, int where,
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int size, u32 value)
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{
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unsigned long addr = dc21285_base_address(bus, devfn);
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u32 v;
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if (addr)
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switch (size) {
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case 1:
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asm("strb %0, [%1, %2]"
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: : "r" (value), "r" (addr), "r" (where)
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: "cc");
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break;
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case 2:
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asm("strh %0, [%1, %2]"
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: : "r" (value), "r" (addr), "r" (where)
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: "cc");
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break;
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case 4:
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asm("str %0, [%1, %2]"
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: : "r" (value), "r" (addr), "r" (where)
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: "cc");
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break;
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}
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v = *CSR_PCICMD;
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if (v & PCICMD_ABORT) {
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*CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
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return -1;
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}
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return PCIBIOS_SUCCESSFUL;
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}
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static struct pci_ops dc21285_ops = {
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.read = dc21285_read_config,
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.write = dc21285_write_config,
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};
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static struct timer_list serr_timer;
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static struct timer_list perr_timer;
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static void dc21285_enable_error(unsigned long __data)
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{
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switch (__data) {
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case IRQ_PCI_SERR:
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del_timer(&serr_timer);
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break;
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case IRQ_PCI_PERR:
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del_timer(&perr_timer);
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break;
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}
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enable_irq(__data);
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}
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/*
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* Warn on PCI errors.
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*/
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static irqreturn_t dc21285_abort_irq(int irq, void *dev_id)
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{
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unsigned int cmd;
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unsigned int status;
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cmd = *CSR_PCICMD;
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status = cmd >> 16;
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cmd = cmd & 0xffff;
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if (status & PCI_STATUS_REC_MASTER_ABORT) {
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printk(KERN_DEBUG "PCI: master abort, pc=0x%08lx\n",
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instruction_pointer(get_irq_regs()));
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cmd |= PCI_STATUS_REC_MASTER_ABORT << 16;
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}
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if (status & PCI_STATUS_REC_TARGET_ABORT) {
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printk(KERN_DEBUG "PCI: target abort: ");
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pcibios_report_status(PCI_STATUS_REC_MASTER_ABORT |
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PCI_STATUS_SIG_TARGET_ABORT |
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PCI_STATUS_REC_TARGET_ABORT, 1);
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printk("\n");
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cmd |= PCI_STATUS_REC_TARGET_ABORT << 16;
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}
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*CSR_PCICMD = cmd;
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return IRQ_HANDLED;
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}
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static irqreturn_t dc21285_serr_irq(int irq, void *dev_id)
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{
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struct timer_list *timer = dev_id;
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unsigned int cntl;
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printk(KERN_DEBUG "PCI: system error received: ");
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pcibios_report_status(PCI_STATUS_SIG_SYSTEM_ERROR, 1);
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printk("\n");
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cntl = *CSR_SA110_CNTL & 0xffffdf07;
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*CSR_SA110_CNTL = cntl | SA110_CNTL_RXSERR;
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/*
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* back off this interrupt
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*/
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disable_irq(irq);
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timer->expires = jiffies + HZ;
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add_timer(timer);
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return IRQ_HANDLED;
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}
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static irqreturn_t dc21285_discard_irq(int irq, void *dev_id)
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{
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printk(KERN_DEBUG "PCI: discard timer expired\n");
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*CSR_SA110_CNTL &= 0xffffde07;
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return IRQ_HANDLED;
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}
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static irqreturn_t dc21285_dparity_irq(int irq, void *dev_id)
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{
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unsigned int cmd;
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printk(KERN_DEBUG "PCI: data parity error detected: ");
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pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
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printk("\n");
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cmd = *CSR_PCICMD & 0xffff;
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*CSR_PCICMD = cmd | 1 << 24;
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return IRQ_HANDLED;
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}
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static irqreturn_t dc21285_parity_irq(int irq, void *dev_id)
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{
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struct timer_list *timer = dev_id;
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unsigned int cmd;
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printk(KERN_DEBUG "PCI: parity error detected: ");
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pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
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printk("\n");
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cmd = *CSR_PCICMD & 0xffff;
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*CSR_PCICMD = cmd | 1 << 31;
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/*
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* back off this interrupt
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*/
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disable_irq(irq);
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timer->expires = jiffies + HZ;
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add_timer(timer);
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return IRQ_HANDLED;
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}
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int __init dc21285_setup(int nr, struct pci_sys_data *sys)
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{
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struct resource *res;
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if (nr || !footbridge_cfn_mode())
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return 0;
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res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
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if (!res) {
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printk("out of memory for root bus resources");
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return 0;
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}
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res[0].flags = IORESOURCE_MEM;
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res[0].name = "Footbridge non-prefetch";
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res[1].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
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res[1].name = "Footbridge prefetch";
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allocate_resource(&iomem_resource, &res[1], 0x20000000,
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0xa0000000, 0xffffffff, 0x20000000, NULL, NULL);
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allocate_resource(&iomem_resource, &res[0], 0x40000000,
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0x80000000, 0xffffffff, 0x40000000, NULL, NULL);
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sys->mem_offset = DC21285_PCI_MEM;
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pci_add_resource_offset(&sys->resources,
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&ioport_resource, sys->io_offset);
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pci_add_resource_offset(&sys->resources, &res[0], sys->mem_offset);
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pci_add_resource_offset(&sys->resources, &res[1], sys->mem_offset);
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return 1;
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}
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struct pci_bus * __init dc21285_scan_bus(int nr, struct pci_sys_data *sys)
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{
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return pci_scan_root_bus(NULL, 0, &dc21285_ops, sys, &sys->resources);
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}
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#define dc21285_request_irq(_a, _b, _c, _d, _e) \
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WARN_ON(request_irq(_a, _b, _c, _d, _e) < 0)
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void __init dc21285_preinit(void)
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{
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unsigned int mem_size, mem_mask;
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int cfn_mode;
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pcibios_min_mem = 0x81000000;
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vga_base = PCIMEM_BASE;
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mem_size = (unsigned int)high_memory - PAGE_OFFSET;
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for (mem_mask = 0x00100000; mem_mask < 0x10000000; mem_mask <<= 1)
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if (mem_mask >= mem_size)
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break;
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/*
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* These registers need to be set up whether we're the
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* central function or not.
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*/
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*CSR_SDRAMBASEMASK = (mem_mask - 1) & 0x0ffc0000;
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*CSR_SDRAMBASEOFFSET = 0;
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*CSR_ROMBASEMASK = 0x80000000;
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*CSR_CSRBASEMASK = 0;
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*CSR_CSRBASEOFFSET = 0;
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*CSR_PCIADDR_EXTN = 0;
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cfn_mode = __footbridge_cfn_mode();
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printk(KERN_INFO "PCI: DC21285 footbridge, revision %02lX, in "
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"%s mode\n", *CSR_CLASSREV & 0xff, cfn_mode ?
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"central function" : "addin");
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if (footbridge_cfn_mode()) {
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/*
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* Clear any existing errors - we aren't
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* interested in historical data...
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*/
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*CSR_SA110_CNTL = (*CSR_SA110_CNTL & 0xffffde07) |
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SA110_CNTL_RXSERR;
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*CSR_PCICMD = (*CSR_PCICMD & 0xffff) | PCICMD_ERROR_BITS;
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}
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init_timer(&serr_timer);
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init_timer(&perr_timer);
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serr_timer.data = IRQ_PCI_SERR;
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serr_timer.function = dc21285_enable_error;
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perr_timer.data = IRQ_PCI_PERR;
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perr_timer.function = dc21285_enable_error;
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/*
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* We don't care if these fail.
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*/
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dc21285_request_irq(IRQ_PCI_SERR, dc21285_serr_irq, IRQF_DISABLED,
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"PCI system error", &serr_timer);
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dc21285_request_irq(IRQ_PCI_PERR, dc21285_parity_irq, IRQF_DISABLED,
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"PCI parity error", &perr_timer);
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dc21285_request_irq(IRQ_PCI_ABORT, dc21285_abort_irq, IRQF_DISABLED,
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"PCI abort", NULL);
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dc21285_request_irq(IRQ_DISCARD_TIMER, dc21285_discard_irq, IRQF_DISABLED,
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"Discard timer", NULL);
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dc21285_request_irq(IRQ_PCI_DPERR, dc21285_dparity_irq, IRQF_DISABLED,
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"PCI data parity", NULL);
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if (cfn_mode) {
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static struct resource csrio;
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csrio.flags = IORESOURCE_IO;
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csrio.name = "Footbridge";
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allocate_resource(&ioport_resource, &csrio, 128,
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0xff00, 0xffff, 128, NULL, NULL);
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/*
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* Map our SDRAM at a known address in PCI space, just in case
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* the firmware had other ideas. Using a nonzero base is
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* necessary, since some VGA cards forcefully use PCI addresses
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* in the range 0x000a0000 to 0x000c0000. (eg, S3 cards).
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*/
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*CSR_PCICSRBASE = 0xf4000000;
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*CSR_PCICSRIOBASE = csrio.start;
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*CSR_PCISDRAMBASE = __virt_to_bus(PAGE_OFFSET);
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*CSR_PCIROMBASE = 0;
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*CSR_PCICMD = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
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PCI_COMMAND_INVALIDATE | PCICMD_ERROR_BITS;
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} else if (footbridge_cfn_mode() != 0) {
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/*
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* If we are not compiled to accept "add-in" mode, then
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* we are using a constant virt_to_bus translation which
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* can not hope to cater for the way the host BIOS has
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* set up the machine.
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*/
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panic("PCI: this kernel is compiled for central "
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"function mode only");
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}
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}
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void __init dc21285_postinit(void)
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{
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register_isa_ports(DC21285_PCI_MEM, DC21285_PCI_IO, 0);
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}
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