![Yijing Wang](/assets/img/avatar_default.png)
Use pci_is_bridge() to simplify code. No functional change. Requires:326c1cdae7
PCI: Rename pci_is_bridge() to pci_has_subordinate() Requires:1c86438c94
PCI: Add new pci_is_bridge() interface Signed-off-by: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: David S. Miller <davem@davemloft.net>
1009 lines
25 KiB
C
1009 lines
25 KiB
C
/* pci.c: UltraSparc PCI controller support.
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*
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* Copyright (C) 1997, 1998, 1999 David S. Miller (davem@redhat.com)
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* Copyright (C) 1998, 1999 Eddie C. Dost (ecd@skynet.be)
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* Copyright (C) 1999 Jakub Jelinek (jj@ultra.linux.cz)
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*
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* OF tree based PCI bus probing taken from the PowerPC port
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* with minor modifications, see there for credits.
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*/
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/pci.h>
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#include <linux/msi.h>
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#include <linux/irq.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/irq.h>
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#include <asm/prom.h>
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#include <asm/apb.h>
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#include "pci_impl.h"
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/* List of all PCI controllers found in the system. */
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struct pci_pbm_info *pci_pbm_root = NULL;
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/* Each PBM found gets a unique index. */
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int pci_num_pbms = 0;
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volatile int pci_poke_in_progress;
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volatile int pci_poke_cpu = -1;
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volatile int pci_poke_faulted;
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static DEFINE_SPINLOCK(pci_poke_lock);
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void pci_config_read8(u8 *addr, u8 *ret)
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{
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unsigned long flags;
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u8 byte;
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spin_lock_irqsave(&pci_poke_lock, flags);
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pci_poke_cpu = smp_processor_id();
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pci_poke_in_progress = 1;
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pci_poke_faulted = 0;
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__asm__ __volatile__("membar #Sync\n\t"
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"lduba [%1] %2, %0\n\t"
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"membar #Sync"
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: "=r" (byte)
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: "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
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: "memory");
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pci_poke_in_progress = 0;
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pci_poke_cpu = -1;
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if (!pci_poke_faulted)
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*ret = byte;
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spin_unlock_irqrestore(&pci_poke_lock, flags);
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}
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void pci_config_read16(u16 *addr, u16 *ret)
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{
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unsigned long flags;
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u16 word;
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spin_lock_irqsave(&pci_poke_lock, flags);
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pci_poke_cpu = smp_processor_id();
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pci_poke_in_progress = 1;
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pci_poke_faulted = 0;
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__asm__ __volatile__("membar #Sync\n\t"
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"lduha [%1] %2, %0\n\t"
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"membar #Sync"
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: "=r" (word)
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: "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
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: "memory");
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pci_poke_in_progress = 0;
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pci_poke_cpu = -1;
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if (!pci_poke_faulted)
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*ret = word;
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spin_unlock_irqrestore(&pci_poke_lock, flags);
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}
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void pci_config_read32(u32 *addr, u32 *ret)
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{
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unsigned long flags;
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u32 dword;
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spin_lock_irqsave(&pci_poke_lock, flags);
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pci_poke_cpu = smp_processor_id();
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pci_poke_in_progress = 1;
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pci_poke_faulted = 0;
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__asm__ __volatile__("membar #Sync\n\t"
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"lduwa [%1] %2, %0\n\t"
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"membar #Sync"
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: "=r" (dword)
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: "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
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: "memory");
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pci_poke_in_progress = 0;
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pci_poke_cpu = -1;
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if (!pci_poke_faulted)
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*ret = dword;
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spin_unlock_irqrestore(&pci_poke_lock, flags);
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}
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void pci_config_write8(u8 *addr, u8 val)
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{
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unsigned long flags;
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spin_lock_irqsave(&pci_poke_lock, flags);
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pci_poke_cpu = smp_processor_id();
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pci_poke_in_progress = 1;
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pci_poke_faulted = 0;
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__asm__ __volatile__("membar #Sync\n\t"
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"stba %0, [%1] %2\n\t"
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"membar #Sync"
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: /* no outputs */
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: "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
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: "memory");
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pci_poke_in_progress = 0;
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pci_poke_cpu = -1;
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spin_unlock_irqrestore(&pci_poke_lock, flags);
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}
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void pci_config_write16(u16 *addr, u16 val)
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{
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unsigned long flags;
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spin_lock_irqsave(&pci_poke_lock, flags);
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pci_poke_cpu = smp_processor_id();
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pci_poke_in_progress = 1;
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pci_poke_faulted = 0;
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__asm__ __volatile__("membar #Sync\n\t"
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"stha %0, [%1] %2\n\t"
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"membar #Sync"
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: /* no outputs */
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: "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
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: "memory");
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pci_poke_in_progress = 0;
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pci_poke_cpu = -1;
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spin_unlock_irqrestore(&pci_poke_lock, flags);
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}
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void pci_config_write32(u32 *addr, u32 val)
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{
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unsigned long flags;
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spin_lock_irqsave(&pci_poke_lock, flags);
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pci_poke_cpu = smp_processor_id();
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pci_poke_in_progress = 1;
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pci_poke_faulted = 0;
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__asm__ __volatile__("membar #Sync\n\t"
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"stwa %0, [%1] %2\n\t"
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"membar #Sync"
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: /* no outputs */
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: "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
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: "memory");
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pci_poke_in_progress = 0;
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pci_poke_cpu = -1;
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spin_unlock_irqrestore(&pci_poke_lock, flags);
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}
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static int ofpci_verbose;
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static int __init ofpci_debug(char *str)
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{
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int val = 0;
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get_option(&str, &val);
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if (val)
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ofpci_verbose = 1;
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return 1;
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}
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__setup("ofpci_debug=", ofpci_debug);
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static unsigned long pci_parse_of_flags(u32 addr0)
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{
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unsigned long flags = 0;
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if (addr0 & 0x02000000) {
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flags = IORESOURCE_MEM | PCI_BASE_ADDRESS_SPACE_MEMORY;
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flags |= (addr0 >> 22) & PCI_BASE_ADDRESS_MEM_TYPE_64;
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flags |= (addr0 >> 28) & PCI_BASE_ADDRESS_MEM_TYPE_1M;
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if (addr0 & 0x40000000)
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flags |= IORESOURCE_PREFETCH
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| PCI_BASE_ADDRESS_MEM_PREFETCH;
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} else if (addr0 & 0x01000000)
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flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO;
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return flags;
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}
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/* The of_device layer has translated all of the assigned-address properties
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* into physical address resources, we only have to figure out the register
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* mapping.
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*/
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static void pci_parse_of_addrs(struct platform_device *op,
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struct device_node *node,
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struct pci_dev *dev)
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{
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struct resource *op_res;
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const u32 *addrs;
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int proplen;
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addrs = of_get_property(node, "assigned-addresses", &proplen);
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if (!addrs)
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return;
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if (ofpci_verbose)
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printk(" parse addresses (%d bytes) @ %p\n",
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proplen, addrs);
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op_res = &op->resource[0];
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for (; proplen >= 20; proplen -= 20, addrs += 5, op_res++) {
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struct resource *res;
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unsigned long flags;
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int i;
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flags = pci_parse_of_flags(addrs[0]);
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if (!flags)
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continue;
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i = addrs[0] & 0xff;
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if (ofpci_verbose)
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printk(" start: %llx, end: %llx, i: %x\n",
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op_res->start, op_res->end, i);
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if (PCI_BASE_ADDRESS_0 <= i && i <= PCI_BASE_ADDRESS_5) {
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res = &dev->resource[(i - PCI_BASE_ADDRESS_0) >> 2];
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} else if (i == dev->rom_base_reg) {
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res = &dev->resource[PCI_ROM_RESOURCE];
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flags |= IORESOURCE_READONLY | IORESOURCE_CACHEABLE
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| IORESOURCE_SIZEALIGN;
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} else {
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printk(KERN_ERR "PCI: bad cfg reg num 0x%x\n", i);
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continue;
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}
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res->start = op_res->start;
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res->end = op_res->end;
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res->flags = flags;
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res->name = pci_name(dev);
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}
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}
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static struct pci_dev *of_create_pci_dev(struct pci_pbm_info *pbm,
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struct device_node *node,
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struct pci_bus *bus, int devfn)
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{
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struct dev_archdata *sd;
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struct pci_slot *slot;
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struct platform_device *op;
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struct pci_dev *dev;
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const char *type;
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u32 class;
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dev = pci_alloc_dev(bus);
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if (!dev)
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return NULL;
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sd = &dev->dev.archdata;
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sd->iommu = pbm->iommu;
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sd->stc = &pbm->stc;
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sd->host_controller = pbm;
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sd->op = op = of_find_device_by_node(node);
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sd->numa_node = pbm->numa_node;
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sd = &op->dev.archdata;
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sd->iommu = pbm->iommu;
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sd->stc = &pbm->stc;
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sd->numa_node = pbm->numa_node;
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if (!strcmp(node->name, "ebus"))
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of_propagate_archdata(op);
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type = of_get_property(node, "device_type", NULL);
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if (type == NULL)
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type = "";
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if (ofpci_verbose)
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printk(" create device, devfn: %x, type: %s\n",
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devfn, type);
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dev->sysdata = node;
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dev->dev.parent = bus->bridge;
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dev->dev.bus = &pci_bus_type;
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dev->dev.of_node = of_node_get(node);
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dev->devfn = devfn;
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dev->multifunction = 0; /* maybe a lie? */
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set_pcie_port_type(dev);
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list_for_each_entry(slot, &dev->bus->slots, list)
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if (PCI_SLOT(dev->devfn) == slot->number)
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dev->slot = slot;
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dev->vendor = of_getintprop_default(node, "vendor-id", 0xffff);
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dev->device = of_getintprop_default(node, "device-id", 0xffff);
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dev->subsystem_vendor =
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of_getintprop_default(node, "subsystem-vendor-id", 0);
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dev->subsystem_device =
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of_getintprop_default(node, "subsystem-id", 0);
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dev->cfg_size = pci_cfg_space_size(dev);
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/* We can't actually use the firmware value, we have
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* to read what is in the register right now. One
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* reason is that in the case of IDE interfaces the
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* firmware can sample the value before the the IDE
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* interface is programmed into native mode.
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*/
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pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
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dev->class = class >> 8;
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dev->revision = class & 0xff;
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dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(bus),
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dev->bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn));
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if (ofpci_verbose)
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printk(" class: 0x%x device name: %s\n",
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dev->class, pci_name(dev));
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/* I have seen IDE devices which will not respond to
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* the bmdma simplex check reads if bus mastering is
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* disabled.
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*/
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if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE)
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pci_set_master(dev);
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dev->current_state = PCI_UNKNOWN; /* unknown power state */
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dev->error_state = pci_channel_io_normal;
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dev->dma_mask = 0xffffffff;
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if (!strcmp(node->name, "pci")) {
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/* a PCI-PCI bridge */
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dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;
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dev->rom_base_reg = PCI_ROM_ADDRESS1;
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} else if (!strcmp(type, "cardbus")) {
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dev->hdr_type = PCI_HEADER_TYPE_CARDBUS;
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} else {
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dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
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dev->rom_base_reg = PCI_ROM_ADDRESS;
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dev->irq = sd->op->archdata.irqs[0];
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if (dev->irq == 0xffffffff)
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dev->irq = PCI_IRQ_NONE;
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}
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pci_parse_of_addrs(sd->op, node, dev);
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if (ofpci_verbose)
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printk(" adding to system ...\n");
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pci_device_add(dev, bus);
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return dev;
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}
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static void apb_calc_first_last(u8 map, u32 *first_p, u32 *last_p)
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{
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u32 idx, first, last;
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first = 8;
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last = 0;
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for (idx = 0; idx < 8; idx++) {
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if ((map & (1 << idx)) != 0) {
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if (first > idx)
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first = idx;
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if (last < idx)
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last = idx;
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}
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}
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*first_p = first;
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*last_p = last;
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}
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/* Cook up fake bus resources for SUNW,simba PCI bridges which lack
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* a proper 'ranges' property.
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*/
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static void apb_fake_ranges(struct pci_dev *dev,
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struct pci_bus *bus,
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struct pci_pbm_info *pbm)
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{
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struct pci_bus_region region;
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struct resource *res;
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u32 first, last;
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u8 map;
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pci_read_config_byte(dev, APB_IO_ADDRESS_MAP, &map);
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apb_calc_first_last(map, &first, &last);
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res = bus->resource[0];
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res->flags = IORESOURCE_IO;
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region.start = (first << 21);
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region.end = (last << 21) + ((1 << 21) - 1);
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pcibios_bus_to_resource(dev->bus, res, ®ion);
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pci_read_config_byte(dev, APB_MEM_ADDRESS_MAP, &map);
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apb_calc_first_last(map, &first, &last);
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res = bus->resource[1];
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res->flags = IORESOURCE_MEM;
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region.start = (first << 29);
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region.end = (last << 29) + ((1 << 29) - 1);
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pcibios_bus_to_resource(dev->bus, res, ®ion);
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}
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static void pci_of_scan_bus(struct pci_pbm_info *pbm,
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struct device_node *node,
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struct pci_bus *bus);
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#define GET_64BIT(prop, i) ((((u64) (prop)[(i)]) << 32) | (prop)[(i)+1])
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static void of_scan_pci_bridge(struct pci_pbm_info *pbm,
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struct device_node *node,
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struct pci_dev *dev)
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{
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struct pci_bus *bus;
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const u32 *busrange, *ranges;
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int len, i, simba;
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struct pci_bus_region region;
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struct resource *res;
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unsigned int flags;
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u64 size;
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if (ofpci_verbose)
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printk("of_scan_pci_bridge(%s)\n", node->full_name);
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/* parse bus-range property */
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busrange = of_get_property(node, "bus-range", &len);
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if (busrange == NULL || len != 8) {
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printk(KERN_DEBUG "Can't get bus-range for PCI-PCI bridge %s\n",
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node->full_name);
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return;
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}
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ranges = of_get_property(node, "ranges", &len);
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simba = 0;
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if (ranges == NULL) {
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const char *model = of_get_property(node, "model", NULL);
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if (model && !strcmp(model, "SUNW,simba"))
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simba = 1;
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}
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bus = pci_add_new_bus(dev->bus, dev, busrange[0]);
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if (!bus) {
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printk(KERN_ERR "Failed to create pci bus for %s\n",
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node->full_name);
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return;
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}
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bus->primary = dev->bus->number;
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pci_bus_insert_busn_res(bus, busrange[0], busrange[1]);
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bus->bridge_ctl = 0;
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/* parse ranges property, or cook one up by hand for Simba */
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/* PCI #address-cells == 3 and #size-cells == 2 always */
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res = &dev->resource[PCI_BRIDGE_RESOURCES];
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for (i = 0; i < PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES; ++i) {
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res->flags = 0;
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bus->resource[i] = res;
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++res;
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}
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if (simba) {
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apb_fake_ranges(dev, bus, pbm);
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goto after_ranges;
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} else if (ranges == NULL) {
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pci_read_bridge_bases(bus);
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goto after_ranges;
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}
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i = 1;
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for (; len >= 32; len -= 32, ranges += 8) {
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flags = pci_parse_of_flags(ranges[0]);
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size = GET_64BIT(ranges, 6);
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if (flags == 0 || size == 0)
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continue;
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if (flags & IORESOURCE_IO) {
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res = bus->resource[0];
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if (res->flags) {
|
|
printk(KERN_ERR "PCI: ignoring extra I/O range"
|
|
" for bridge %s\n", node->full_name);
|
|
continue;
|
|
}
|
|
} else {
|
|
if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) {
|
|
printk(KERN_ERR "PCI: too many memory ranges"
|
|
" for bridge %s\n", node->full_name);
|
|
continue;
|
|
}
|
|
res = bus->resource[i];
|
|
++i;
|
|
}
|
|
|
|
res->flags = flags;
|
|
region.start = GET_64BIT(ranges, 1);
|
|
region.end = region.start + size - 1;
|
|
pcibios_bus_to_resource(dev->bus, res, ®ion);
|
|
}
|
|
after_ranges:
|
|
sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus),
|
|
bus->number);
|
|
if (ofpci_verbose)
|
|
printk(" bus name: %s\n", bus->name);
|
|
|
|
pci_of_scan_bus(pbm, node, bus);
|
|
}
|
|
|
|
static void pci_of_scan_bus(struct pci_pbm_info *pbm,
|
|
struct device_node *node,
|
|
struct pci_bus *bus)
|
|
{
|
|
struct device_node *child;
|
|
const u32 *reg;
|
|
int reglen, devfn, prev_devfn;
|
|
struct pci_dev *dev;
|
|
|
|
if (ofpci_verbose)
|
|
printk("PCI: scan_bus[%s] bus no %d\n",
|
|
node->full_name, bus->number);
|
|
|
|
child = NULL;
|
|
prev_devfn = -1;
|
|
while ((child = of_get_next_child(node, child)) != NULL) {
|
|
if (ofpci_verbose)
|
|
printk(" * %s\n", child->full_name);
|
|
reg = of_get_property(child, "reg", ®len);
|
|
if (reg == NULL || reglen < 20)
|
|
continue;
|
|
|
|
devfn = (reg[0] >> 8) & 0xff;
|
|
|
|
/* This is a workaround for some device trees
|
|
* which list PCI devices twice. On the V100
|
|
* for example, device number 3 is listed twice.
|
|
* Once as "pm" and once again as "lomp".
|
|
*/
|
|
if (devfn == prev_devfn)
|
|
continue;
|
|
prev_devfn = devfn;
|
|
|
|
/* create a new pci_dev for this device */
|
|
dev = of_create_pci_dev(pbm, child, bus, devfn);
|
|
if (!dev)
|
|
continue;
|
|
if (ofpci_verbose)
|
|
printk("PCI: dev header type: %x\n",
|
|
dev->hdr_type);
|
|
|
|
if (pci_is_bridge(dev))
|
|
of_scan_pci_bridge(pbm, child, dev);
|
|
}
|
|
}
|
|
|
|
static ssize_t
|
|
show_pciobppath_attr(struct device * dev, struct device_attribute * attr, char * buf)
|
|
{
|
|
struct pci_dev *pdev;
|
|
struct device_node *dp;
|
|
|
|
pdev = to_pci_dev(dev);
|
|
dp = pdev->dev.of_node;
|
|
|
|
return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
|
|
}
|
|
|
|
static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, show_pciobppath_attr, NULL);
|
|
|
|
static void pci_bus_register_of_sysfs(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
struct pci_bus *child_bus;
|
|
int err;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
/* we don't really care if we can create this file or
|
|
* not, but we need to assign the result of the call
|
|
* or the world will fall under alien invasion and
|
|
* everybody will be frozen on a spaceship ready to be
|
|
* eaten on alpha centauri by some green and jelly
|
|
* humanoid.
|
|
*/
|
|
err = sysfs_create_file(&dev->dev.kobj, &dev_attr_obppath.attr);
|
|
(void) err;
|
|
}
|
|
list_for_each_entry(child_bus, &bus->children, node)
|
|
pci_bus_register_of_sysfs(child_bus);
|
|
}
|
|
|
|
struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
|
|
struct device *parent)
|
|
{
|
|
LIST_HEAD(resources);
|
|
struct device_node *node = pbm->op->dev.of_node;
|
|
struct pci_bus *bus;
|
|
|
|
printk("PCI: Scanning PBM %s\n", node->full_name);
|
|
|
|
pci_add_resource_offset(&resources, &pbm->io_space,
|
|
pbm->io_space.start);
|
|
pci_add_resource_offset(&resources, &pbm->mem_space,
|
|
pbm->mem_space.start);
|
|
pbm->busn.start = pbm->pci_first_busno;
|
|
pbm->busn.end = pbm->pci_last_busno;
|
|
pbm->busn.flags = IORESOURCE_BUS;
|
|
pci_add_resource(&resources, &pbm->busn);
|
|
bus = pci_create_root_bus(parent, pbm->pci_first_busno, pbm->pci_ops,
|
|
pbm, &resources);
|
|
if (!bus) {
|
|
printk(KERN_ERR "Failed to create bus for %s\n",
|
|
node->full_name);
|
|
pci_free_resource_list(&resources);
|
|
return NULL;
|
|
}
|
|
|
|
pci_of_scan_bus(pbm, node, bus);
|
|
pci_bus_add_devices(bus);
|
|
pci_bus_register_of_sysfs(bus);
|
|
|
|
return bus;
|
|
}
|
|
|
|
void pcibios_fixup_bus(struct pci_bus *pbus)
|
|
{
|
|
}
|
|
|
|
resource_size_t pcibios_align_resource(void *data, const struct resource *res,
|
|
resource_size_t size, resource_size_t align)
|
|
{
|
|
return res->start;
|
|
}
|
|
|
|
int pcibios_enable_device(struct pci_dev *dev, int mask)
|
|
{
|
|
u16 cmd, oldcmd;
|
|
int i;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
|
oldcmd = cmd;
|
|
|
|
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
|
|
struct resource *res = &dev->resource[i];
|
|
|
|
/* Only set up the requested stuff */
|
|
if (!(mask & (1<<i)))
|
|
continue;
|
|
|
|
if (res->flags & IORESOURCE_IO)
|
|
cmd |= PCI_COMMAND_IO;
|
|
if (res->flags & IORESOURCE_MEM)
|
|
cmd |= PCI_COMMAND_MEMORY;
|
|
}
|
|
|
|
if (cmd != oldcmd) {
|
|
printk(KERN_DEBUG "PCI: Enabling device: (%s), cmd %x\n",
|
|
pci_name(dev), cmd);
|
|
/* Enable the appropriate bits in the PCI command register. */
|
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Platform support for /proc/bus/pci/X/Y mmap()s. */
|
|
|
|
/* If the user uses a host-bridge as the PCI device, he may use
|
|
* this to perform a raw mmap() of the I/O or MEM space behind
|
|
* that controller.
|
|
*
|
|
* This can be useful for execution of x86 PCI bios initialization code
|
|
* on a PCI card, like the xfree86 int10 stuff does.
|
|
*/
|
|
static int __pci_mmap_make_offset_bus(struct pci_dev *pdev, struct vm_area_struct *vma,
|
|
enum pci_mmap_state mmap_state)
|
|
{
|
|
struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
|
|
unsigned long space_size, user_offset, user_size;
|
|
|
|
if (mmap_state == pci_mmap_io) {
|
|
space_size = resource_size(&pbm->io_space);
|
|
} else {
|
|
space_size = resource_size(&pbm->mem_space);
|
|
}
|
|
|
|
/* Make sure the request is in range. */
|
|
user_offset = vma->vm_pgoff << PAGE_SHIFT;
|
|
user_size = vma->vm_end - vma->vm_start;
|
|
|
|
if (user_offset >= space_size ||
|
|
(user_offset + user_size) > space_size)
|
|
return -EINVAL;
|
|
|
|
if (mmap_state == pci_mmap_io) {
|
|
vma->vm_pgoff = (pbm->io_space.start +
|
|
user_offset) >> PAGE_SHIFT;
|
|
} else {
|
|
vma->vm_pgoff = (pbm->mem_space.start +
|
|
user_offset) >> PAGE_SHIFT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Adjust vm_pgoff of VMA such that it is the physical page offset
|
|
* corresponding to the 32-bit pci bus offset for DEV requested by the user.
|
|
*
|
|
* Basically, the user finds the base address for his device which he wishes
|
|
* to mmap. They read the 32-bit value from the config space base register,
|
|
* add whatever PAGE_SIZE multiple offset they wish, and feed this into the
|
|
* offset parameter of mmap on /proc/bus/pci/XXX for that device.
|
|
*
|
|
* Returns negative error code on failure, zero on success.
|
|
*/
|
|
static int __pci_mmap_make_offset(struct pci_dev *pdev,
|
|
struct vm_area_struct *vma,
|
|
enum pci_mmap_state mmap_state)
|
|
{
|
|
unsigned long user_paddr, user_size;
|
|
int i, err;
|
|
|
|
/* First compute the physical address in vma->vm_pgoff,
|
|
* making sure the user offset is within range in the
|
|
* appropriate PCI space.
|
|
*/
|
|
err = __pci_mmap_make_offset_bus(pdev, vma, mmap_state);
|
|
if (err)
|
|
return err;
|
|
|
|
/* If this is a mapping on a host bridge, any address
|
|
* is OK.
|
|
*/
|
|
if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
|
|
return err;
|
|
|
|
/* Otherwise make sure it's in the range for one of the
|
|
* device's resources.
|
|
*/
|
|
user_paddr = vma->vm_pgoff << PAGE_SHIFT;
|
|
user_size = vma->vm_end - vma->vm_start;
|
|
|
|
for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
|
|
struct resource *rp = &pdev->resource[i];
|
|
resource_size_t aligned_end;
|
|
|
|
/* Active? */
|
|
if (!rp->flags)
|
|
continue;
|
|
|
|
/* Same type? */
|
|
if (i == PCI_ROM_RESOURCE) {
|
|
if (mmap_state != pci_mmap_mem)
|
|
continue;
|
|
} else {
|
|
if ((mmap_state == pci_mmap_io &&
|
|
(rp->flags & IORESOURCE_IO) == 0) ||
|
|
(mmap_state == pci_mmap_mem &&
|
|
(rp->flags & IORESOURCE_MEM) == 0))
|
|
continue;
|
|
}
|
|
|
|
/* Align the resource end to the next page address.
|
|
* PAGE_SIZE intentionally added instead of (PAGE_SIZE - 1),
|
|
* because actually we need the address of the next byte
|
|
* after rp->end.
|
|
*/
|
|
aligned_end = (rp->end + PAGE_SIZE) & PAGE_MASK;
|
|
|
|
if ((rp->start <= user_paddr) &&
|
|
(user_paddr + user_size) <= aligned_end)
|
|
break;
|
|
}
|
|
|
|
if (i > PCI_ROM_RESOURCE)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
|
|
* device mapping.
|
|
*/
|
|
static void __pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_area_struct *vma,
|
|
enum pci_mmap_state mmap_state)
|
|
{
|
|
/* Our io_remap_pfn_range takes care of this, do nothing. */
|
|
}
|
|
|
|
/* Perform the actual remap of the pages for a PCI device mapping, as appropriate
|
|
* for this architecture. The region in the process to map is described by vm_start
|
|
* and vm_end members of VMA, the base physical address is found in vm_pgoff.
|
|
* The pci device structure is provided so that architectures may make mapping
|
|
* decisions on a per-device or per-bus basis.
|
|
*
|
|
* Returns a negative error code on failure, zero on success.
|
|
*/
|
|
int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
|
|
enum pci_mmap_state mmap_state,
|
|
int write_combine)
|
|
{
|
|
int ret;
|
|
|
|
ret = __pci_mmap_make_offset(dev, vma, mmap_state);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
__pci_mmap_set_pgprot(dev, vma, mmap_state);
|
|
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
ret = io_remap_pfn_range(vma, vma->vm_start,
|
|
vma->vm_pgoff,
|
|
vma->vm_end - vma->vm_start,
|
|
vma->vm_page_prot);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_NUMA
|
|
int pcibus_to_node(struct pci_bus *pbus)
|
|
{
|
|
struct pci_pbm_info *pbm = pbus->sysdata;
|
|
|
|
return pbm->numa_node;
|
|
}
|
|
EXPORT_SYMBOL(pcibus_to_node);
|
|
#endif
|
|
|
|
/* Return the domain number for this pci bus */
|
|
|
|
int pci_domain_nr(struct pci_bus *pbus)
|
|
{
|
|
struct pci_pbm_info *pbm = pbus->sysdata;
|
|
int ret;
|
|
|
|
if (!pbm) {
|
|
ret = -ENXIO;
|
|
} else {
|
|
ret = pbm->index;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(pci_domain_nr);
|
|
|
|
#ifdef CONFIG_PCI_MSI
|
|
int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
|
|
{
|
|
struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
|
|
unsigned int irq;
|
|
|
|
if (!pbm->setup_msi_irq)
|
|
return -EINVAL;
|
|
|
|
return pbm->setup_msi_irq(&irq, pdev, desc);
|
|
}
|
|
|
|
void arch_teardown_msi_irq(unsigned int irq)
|
|
{
|
|
struct msi_desc *entry = irq_get_msi_desc(irq);
|
|
struct pci_dev *pdev = entry->dev;
|
|
struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
|
|
|
|
if (pbm->teardown_msi_irq)
|
|
pbm->teardown_msi_irq(irq, pdev);
|
|
}
|
|
#endif /* !(CONFIG_PCI_MSI) */
|
|
|
|
static void ali_sound_dma_hack(struct pci_dev *pdev, int set_bit)
|
|
{
|
|
struct pci_dev *ali_isa_bridge;
|
|
u8 val;
|
|
|
|
/* ALI sound chips generate 31-bits of DMA, a special register
|
|
* determines what bit 31 is emitted as.
|
|
*/
|
|
ali_isa_bridge = pci_get_device(PCI_VENDOR_ID_AL,
|
|
PCI_DEVICE_ID_AL_M1533,
|
|
NULL);
|
|
|
|
pci_read_config_byte(ali_isa_bridge, 0x7e, &val);
|
|
if (set_bit)
|
|
val |= 0x01;
|
|
else
|
|
val &= ~0x01;
|
|
pci_write_config_byte(ali_isa_bridge, 0x7e, val);
|
|
pci_dev_put(ali_isa_bridge);
|
|
}
|
|
|
|
int pci64_dma_supported(struct pci_dev *pdev, u64 device_mask)
|
|
{
|
|
u64 dma_addr_mask;
|
|
|
|
if (pdev == NULL) {
|
|
dma_addr_mask = 0xffffffff;
|
|
} else {
|
|
struct iommu *iommu = pdev->dev.archdata.iommu;
|
|
|
|
dma_addr_mask = iommu->dma_addr_mask;
|
|
|
|
if (pdev->vendor == PCI_VENDOR_ID_AL &&
|
|
pdev->device == PCI_DEVICE_ID_AL_M5451 &&
|
|
device_mask == 0x7fffffff) {
|
|
ali_sound_dma_hack(pdev,
|
|
(dma_addr_mask & 0x80000000) != 0);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (device_mask >= (1UL << 32UL))
|
|
return 0;
|
|
|
|
return (device_mask & dma_addr_mask) == dma_addr_mask;
|
|
}
|
|
|
|
void pci_resource_to_user(const struct pci_dev *pdev, int bar,
|
|
const struct resource *rp, resource_size_t *start,
|
|
resource_size_t *end)
|
|
{
|
|
struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
|
|
unsigned long offset;
|
|
|
|
if (rp->flags & IORESOURCE_IO)
|
|
offset = pbm->io_space.start;
|
|
else
|
|
offset = pbm->mem_space.start;
|
|
|
|
*start = rp->start - offset;
|
|
*end = rp->end - offset;
|
|
}
|
|
|
|
void pcibios_set_master(struct pci_dev *dev)
|
|
{
|
|
/* No special bus mastering setup handling */
|
|
}
|
|
|
|
static int __init pcibios_init(void)
|
|
{
|
|
pci_dfl_cache_line_size = 64 >> 2;
|
|
return 0;
|
|
}
|
|
subsys_initcall(pcibios_init);
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
static void pci_bus_slot_names(struct device_node *node, struct pci_bus *bus)
|
|
{
|
|
const struct pci_slot_names {
|
|
u32 slot_mask;
|
|
char names[0];
|
|
} *prop;
|
|
const char *sp;
|
|
int len, i;
|
|
u32 mask;
|
|
|
|
prop = of_get_property(node, "slot-names", &len);
|
|
if (!prop)
|
|
return;
|
|
|
|
mask = prop->slot_mask;
|
|
sp = prop->names;
|
|
|
|
if (ofpci_verbose)
|
|
printk("PCI: Making slots for [%s] mask[0x%02x]\n",
|
|
node->full_name, mask);
|
|
|
|
i = 0;
|
|
while (mask) {
|
|
struct pci_slot *pci_slot;
|
|
u32 this_bit = 1 << i;
|
|
|
|
if (!(mask & this_bit)) {
|
|
i++;
|
|
continue;
|
|
}
|
|
|
|
if (ofpci_verbose)
|
|
printk("PCI: Making slot [%s]\n", sp);
|
|
|
|
pci_slot = pci_create_slot(bus, i, sp, NULL);
|
|
if (IS_ERR(pci_slot))
|
|
printk(KERN_ERR "PCI: pci_create_slot returned %ld\n",
|
|
PTR_ERR(pci_slot));
|
|
|
|
sp += strlen(sp) + 1;
|
|
mask &= ~this_bit;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
static int __init of_pci_slot_init(void)
|
|
{
|
|
struct pci_bus *pbus = NULL;
|
|
|
|
while ((pbus = pci_find_next_bus(pbus)) != NULL) {
|
|
struct device_node *node;
|
|
|
|
if (pbus->self) {
|
|
/* PCI->PCI bridge */
|
|
node = pbus->self->dev.of_node;
|
|
} else {
|
|
struct pci_pbm_info *pbm = pbus->sysdata;
|
|
|
|
/* Host PCI controller */
|
|
node = pbm->op->dev.of_node;
|
|
}
|
|
|
|
pci_bus_slot_names(node, pbus);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
device_initcall(of_pci_slot_init);
|
|
#endif
|