320 строки
9.1 KiB
C
320 строки
9.1 KiB
C
/*
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* Intel MID PCI support
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* Copyright (c) 2008 Intel Corporation
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* Jesse Barnes <jesse.barnes@intel.com>
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*
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* Moorestown has an interesting PCI implementation:
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* - configuration space is memory mapped (as defined by MCFG)
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* - Lincroft devices also have a real, type 1 configuration space
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* - Early Lincroft silicon has a type 1 access bug that will cause
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* a hang if non-existent devices are accessed
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* - some devices have the "fixed BAR" capability, which means
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* they can't be relocated or modified; check for that during
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* BAR sizing
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*
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* So, we use the MCFG space for all reads and writes, but also send
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* Lincroft writes to type 1 space. But only read/write if the device
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* actually exists, otherwise return all 1s for reads and bit bucket
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* the writes.
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*/
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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/init.h>
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#include <linux/dmi.h>
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#include <linux/acpi.h>
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#include <linux/io.h>
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#include <linux/smp.h>
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#include <asm/segment.h>
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#include <asm/pci_x86.h>
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#include <asm/hw_irq.h>
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#include <asm/io_apic.h>
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#include <asm/intel-mid.h>
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#define PCIE_CAP_OFFSET 0x100
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/* Fixed BAR fields */
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#define PCIE_VNDR_CAP_ID_FIXED_BAR 0x00 /* Fixed BAR (TBD) */
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#define PCI_FIXED_BAR_0_SIZE 0x04
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#define PCI_FIXED_BAR_1_SIZE 0x08
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#define PCI_FIXED_BAR_2_SIZE 0x0c
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#define PCI_FIXED_BAR_3_SIZE 0x10
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#define PCI_FIXED_BAR_4_SIZE 0x14
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#define PCI_FIXED_BAR_5_SIZE 0x1c
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static int pci_soc_mode;
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/**
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* fixed_bar_cap - return the offset of the fixed BAR cap if found
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* @bus: PCI bus
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* @devfn: device in question
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*
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* Look for the fixed BAR cap on @bus and @devfn, returning its offset
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* if found or 0 otherwise.
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*/
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static int fixed_bar_cap(struct pci_bus *bus, unsigned int devfn)
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{
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int pos;
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u32 pcie_cap = 0, cap_data;
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pos = PCIE_CAP_OFFSET;
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if (!raw_pci_ext_ops)
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return 0;
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while (pos) {
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if (raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
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devfn, pos, 4, &pcie_cap))
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return 0;
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if (PCI_EXT_CAP_ID(pcie_cap) == 0x0000 ||
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PCI_EXT_CAP_ID(pcie_cap) == 0xffff)
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break;
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if (PCI_EXT_CAP_ID(pcie_cap) == PCI_EXT_CAP_ID_VNDR) {
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raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
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devfn, pos + 4, 4, &cap_data);
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if ((cap_data & 0xffff) == PCIE_VNDR_CAP_ID_FIXED_BAR)
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return pos;
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}
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pos = PCI_EXT_CAP_NEXT(pcie_cap);
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}
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return 0;
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}
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static int pci_device_update_fixed(struct pci_bus *bus, unsigned int devfn,
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int reg, int len, u32 val, int offset)
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{
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u32 size;
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unsigned int domain, busnum;
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int bar = (reg - PCI_BASE_ADDRESS_0) >> 2;
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domain = pci_domain_nr(bus);
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busnum = bus->number;
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if (val == ~0 && len == 4) {
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unsigned long decode;
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raw_pci_ext_ops->read(domain, busnum, devfn,
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offset + 8 + (bar * 4), 4, &size);
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/* Turn the size into a decode pattern for the sizing code */
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if (size) {
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decode = size - 1;
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decode |= decode >> 1;
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decode |= decode >> 2;
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decode |= decode >> 4;
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decode |= decode >> 8;
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decode |= decode >> 16;
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decode++;
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decode = ~(decode - 1);
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} else {
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decode = 0;
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}
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/*
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* If val is all ones, the core code is trying to size the reg,
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* so update the mmconfig space with the real size.
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*
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* Note: this assumes the fixed size we got is a power of two.
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*/
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return raw_pci_ext_ops->write(domain, busnum, devfn, reg, 4,
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decode);
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}
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/* This is some other kind of BAR write, so just do it. */
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return raw_pci_ext_ops->write(domain, busnum, devfn, reg, len, val);
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}
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/**
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* type1_access_ok - check whether to use type 1
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* @bus: bus number
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* @devfn: device & function in question
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*
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* If the bus is on a Lincroft chip and it exists, or is not on a Lincroft at
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* all, the we can go ahead with any reads & writes. If it's on a Lincroft,
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* but doesn't exist, avoid the access altogether to keep the chip from
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* hanging.
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*/
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static bool type1_access_ok(unsigned int bus, unsigned int devfn, int reg)
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{
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/*
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* This is a workaround for A0 LNC bug where PCI status register does
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* not have new CAP bit set. can not be written by SW either.
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*
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* PCI header type in real LNC indicates a single function device, this
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* will prevent probing other devices under the same function in PCI
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* shim. Therefore, use the header type in shim instead.
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*/
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if (reg >= 0x100 || reg == PCI_STATUS || reg == PCI_HEADER_TYPE)
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return false;
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if (bus == 0 && (devfn == PCI_DEVFN(2, 0)
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|| devfn == PCI_DEVFN(0, 0)
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|| devfn == PCI_DEVFN(3, 0)))
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return true;
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return false; /* Langwell on others */
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}
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static int pci_read(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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if (type1_access_ok(bus->number, devfn, where))
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return pci_direct_conf1.read(pci_domain_nr(bus), bus->number,
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devfn, where, size, value);
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return raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
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devfn, where, size, value);
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}
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static int pci_write(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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int offset;
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/*
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* On MRST, there is no PCI ROM BAR, this will cause a subsequent read
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* to ROM BAR return 0 then being ignored.
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*/
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if (where == PCI_ROM_ADDRESS)
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return 0;
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/*
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* Devices with fixed BARs need special handling:
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* - BAR sizing code will save, write ~0, read size, restore
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* - so writes to fixed BARs need special handling
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* - other writes to fixed BAR devices should go through mmconfig
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*/
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offset = fixed_bar_cap(bus, devfn);
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if (offset &&
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(where >= PCI_BASE_ADDRESS_0 && where <= PCI_BASE_ADDRESS_5)) {
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return pci_device_update_fixed(bus, devfn, where, size, value,
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offset);
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}
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/*
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* On Moorestown update both real & mmconfig space
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* Note: early Lincroft silicon can't handle type 1 accesses to
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* non-existent devices, so just eat the write in that case.
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*/
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if (type1_access_ok(bus->number, devfn, where))
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return pci_direct_conf1.write(pci_domain_nr(bus), bus->number,
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devfn, where, size, value);
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return raw_pci_ext_ops->write(pci_domain_nr(bus), bus->number, devfn,
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where, size, value);
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}
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static int intel_mid_pci_irq_enable(struct pci_dev *dev)
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{
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int polarity;
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if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_TANGIER)
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polarity = 0; /* active high */
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else
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polarity = 1; /* active low */
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/*
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* MRST only have IOAPIC, the PCI irq lines are 1:1 mapped to
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* IOAPIC RTE entries, so we just enable RTE for the device.
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*/
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if (mp_set_gsi_attr(dev->irq, 1, polarity, dev_to_node(&dev->dev)))
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return -EBUSY;
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if (mp_map_gsi_to_irq(dev->irq, IOAPIC_MAP_ALLOC) < 0)
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return -EBUSY;
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return 0;
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}
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static void intel_mid_pci_irq_disable(struct pci_dev *dev)
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{
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if (!mp_should_keep_irq(&dev->dev) && dev->irq > 0)
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mp_unmap_irq(dev->irq);
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}
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struct pci_ops intel_mid_pci_ops = {
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.read = pci_read,
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.write = pci_write,
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};
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/**
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* intel_mid_pci_init - installs intel_mid_pci_ops
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*
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* Moorestown has an interesting PCI implementation (see above).
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* Called when the early platform detection installs it.
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*/
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int __init intel_mid_pci_init(void)
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{
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pr_info("Intel MID platform detected, using MID PCI ops\n");
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pci_mmcfg_late_init();
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pcibios_enable_irq = intel_mid_pci_irq_enable;
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pcibios_disable_irq = intel_mid_pci_irq_disable;
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pci_root_ops = intel_mid_pci_ops;
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pci_soc_mode = 1;
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/* Continue with standard init */
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return 1;
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}
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/*
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* Langwell devices are not true PCI devices; they are not subject to 10 ms
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* d3 to d0 delay required by PCI spec.
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*/
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static void pci_d3delay_fixup(struct pci_dev *dev)
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{
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/*
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* PCI fixups are effectively decided compile time. If we have a dual
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* SoC/non-SoC kernel we don't want to mangle d3 on non-SoC devices.
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*/
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if (!pci_soc_mode)
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return;
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/*
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* True PCI devices in Lincroft should allow type 1 access, the rest
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* are Langwell fake PCI devices.
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*/
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if (type1_access_ok(dev->bus->number, dev->devfn, PCI_DEVICE_ID))
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return;
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dev->d3_delay = 0;
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}
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_d3delay_fixup);
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static void mrst_power_off_unused_dev(struct pci_dev *dev)
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{
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pci_set_power_state(dev, PCI_D3hot);
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}
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0801, mrst_power_off_unused_dev);
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0809, mrst_power_off_unused_dev);
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x080C, mrst_power_off_unused_dev);
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0812, mrst_power_off_unused_dev);
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0815, mrst_power_off_unused_dev);
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/*
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* Langwell devices reside at fixed offsets, don't try to move them.
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*/
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static void pci_fixed_bar_fixup(struct pci_dev *dev)
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{
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unsigned long offset;
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u32 size;
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int i;
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if (!pci_soc_mode)
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return;
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/* Must have extended configuration space */
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if (dev->cfg_size < PCIE_CAP_OFFSET + 4)
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return;
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/* Fixup the BAR sizes for fixed BAR devices and make them unmoveable */
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offset = fixed_bar_cap(dev->bus, dev->devfn);
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if (!offset || PCI_DEVFN(2, 0) == dev->devfn ||
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PCI_DEVFN(2, 2) == dev->devfn)
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return;
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for (i = 0; i < PCI_ROM_RESOURCE; i++) {
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pci_read_config_dword(dev, offset + 8 + (i * 4), &size);
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dev->resource[i].end = dev->resource[i].start + size - 1;
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dev->resource[i].flags |= IORESOURCE_PCI_FIXED;
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}
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}
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_fixed_bar_fixup);
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