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linux/arch/arm/mach-sa1100/pci-nanoengine.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* linux/arch/arm/mach-sa1100/pci-nanoengine.c
*
* PCI functions for BSE nanoEngine PCI
*
* Copyright (C) 2010 Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
*/
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <asm/mach/pci.h>
#include <asm/mach-types.h>
#include <mach/nanoengine.h>
#include <mach/hardware.h>
static void __iomem *nanoengine_pci_map_bus(struct pci_bus *bus,
unsigned int devfn, int where)
{
if (bus->number != 0 || (devfn >> 3) != 0)
return NULL;
return (void __iomem *)NANO_PCI_CONFIG_SPACE_VIRT +
((bus->number << 16) | (devfn << 8) | (where & ~3));
}
static struct pci_ops pci_nano_ops = {
.map_bus = nanoengine_pci_map_bus,
.read = pci_generic_config_read32,
.write = pci_generic_config_write32,
};
static int __init pci_nanoengine_map_irq(const struct pci_dev *dev, u8 slot,
u8 pin)
{
return NANOENGINE_IRQ_GPIO_PCI;
}
static struct resource pci_io_ports =
DEFINE_RES_IO_NAMED(0x400, 0x400, "PCI IO");
static struct resource pci_non_prefetchable_memory = {
.name = "PCI non-prefetchable",
.start = NANO_PCI_MEM_RW_PHYS,
/* nanoEngine documentation says there is a 1 Megabyte window here,
* but PCI reports just 128 + 8 kbytes. */
.end = NANO_PCI_MEM_RW_PHYS + NANO_PCI_MEM_RW_SIZE - 1,
/* .end = NANO_PCI_MEM_RW_PHYS + SZ_128K + SZ_8K - 1,*/
.flags = IORESOURCE_MEM,
};
/*
* nanoEngine PCI reports 1 Megabyte of prefetchable memory, but it
* overlaps with previously defined memory.
*
* Here is what happens:
*
# dmesg
...
pci 0000:00:00.0: [8086:1209] type 0 class 0x000200
pci 0000:00:00.0: reg 10: [mem 0x00021000-0x00021fff]
pci 0000:00:00.0: reg 14: [io 0x0000-0x003f]
pci 0000:00:00.0: reg 18: [mem 0x00000000-0x0001ffff]
pci 0000:00:00.0: reg 30: [mem 0x00000000-0x000fffff pref]
pci 0000:00:00.0: supports D1 D2
pci 0000:00:00.0: PME# supported from D0 D1 D2 D3hot
pci 0000:00:00.0: PME# disabled
PCI: bus0: Fast back to back transfers enabled
pci 0000:00:00.0: BAR 6: can't assign mem pref (size 0x100000)
pci 0000:00:00.0: BAR 2: assigned [mem 0x18600000-0x1861ffff]
pci 0000:00:00.0: BAR 2: set to [mem 0x18600000-0x1861ffff] (PCI address [0x0-0x1ffff])
pci 0000:00:00.0: BAR 0: assigned [mem 0x18620000-0x18620fff]
pci 0000:00:00.0: BAR 0: set to [mem 0x18620000-0x18620fff] (PCI address [0x20000-0x20fff])
pci 0000:00:00.0: BAR 1: assigned [io 0x0400-0x043f]
pci 0000:00:00.0: BAR 1: set to [io 0x0400-0x043f] (PCI address [0x0-0x3f])
*
* On the other hand, if we do not request the prefetchable memory resource,
* linux will alloc it first and the two non-prefetchable memory areas that
* are our real interest will not be mapped. So we choose to map it to an
* unused area. It gets recognized as expansion ROM, but becomes disabled.
*
* Here is what happens then:
*
# dmesg
...
pci 0000:00:00.0: [8086:1209] type 0 class 0x000200
pci 0000:00:00.0: reg 10: [mem 0x00021000-0x00021fff]
pci 0000:00:00.0: reg 14: [io 0x0000-0x003f]
pci 0000:00:00.0: reg 18: [mem 0x00000000-0x0001ffff]
pci 0000:00:00.0: reg 30: [mem 0x00000000-0x000fffff pref]
pci 0000:00:00.0: supports D1 D2
pci 0000:00:00.0: PME# supported from D0 D1 D2 D3hot
pci 0000:00:00.0: PME# disabled
PCI: bus0: Fast back to back transfers enabled
pci 0000:00:00.0: BAR 6: assigned [mem 0x78000000-0x780fffff pref]
pci 0000:00:00.0: BAR 2: assigned [mem 0x18600000-0x1861ffff]
pci 0000:00:00.0: BAR 2: set to [mem 0x18600000-0x1861ffff] (PCI address [0x0-0x1ffff])
pci 0000:00:00.0: BAR 0: assigned [mem 0x18620000-0x18620fff]
pci 0000:00:00.0: BAR 0: set to [mem 0x18620000-0x18620fff] (PCI address [0x20000-0x20fff])
pci 0000:00:00.0: BAR 1: assigned [io 0x0400-0x043f]
pci 0000:00:00.0: BAR 1: set to [io 0x0400-0x043f] (PCI address [0x0-0x3f])
# lspci -vv -s 0000:00:00.0
00:00.0 Class 0200: Device 8086:1209 (rev 09)
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR+ <PERR+ INTx-
Latency: 0 (2000ns min, 14000ns max), Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 0
Region 0: Memory at 18620000 (32-bit, non-prefetchable) [size=4K]
Region 1: I/O ports at 0400 [size=64]
Region 2: [virtual] Memory at 18600000 (32-bit, non-prefetchable) [size=128K]
[virtual] Expansion ROM at 78000000 [disabled] [size=1M]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=2 PME-
Kernel driver in use: e100
Kernel modules: e100
*
*/
static struct resource pci_prefetchable_memory = {
.name = "PCI prefetchable",
.start = 0x78000000,
.end = 0x78000000 + NANO_PCI_MEM_RW_SIZE - 1,
.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH,
};
static int __init pci_nanoengine_setup_resources(struct pci_sys_data *sys)
{
if (request_resource(&ioport_resource, &pci_io_ports)) {
printk(KERN_ERR "PCI: unable to allocate io port region\n");
return -EBUSY;
}
if (request_resource(&iomem_resource, &pci_non_prefetchable_memory)) {
release_resource(&pci_io_ports);
printk(KERN_ERR "PCI: unable to allocate non prefetchable\n");
return -EBUSY;
}
if (request_resource(&iomem_resource, &pci_prefetchable_memory)) {
release_resource(&pci_io_ports);
release_resource(&pci_non_prefetchable_memory);
printk(KERN_ERR "PCI: unable to allocate prefetchable\n");
return -EBUSY;
}
pci_add_resource_offset(&sys->resources, &pci_io_ports, sys->io_offset);
pci_add_resource_offset(&sys->resources,
&pci_non_prefetchable_memory, sys->mem_offset);
pci_add_resource_offset(&sys->resources,
&pci_prefetchable_memory, sys->mem_offset);
return 1;
}
int __init pci_nanoengine_setup(int nr, struct pci_sys_data *sys)
{
int ret = 0;
pcibios_min_io = 0;
pcibios_min_mem = 0;
if (nr == 0) {
sys->mem_offset = NANO_PCI_MEM_RW_PHYS;
sys->io_offset = 0x400;
ret = pci_nanoengine_setup_resources(sys);
/* Enable alternate memory bus master mode, see
* "Intel StrongARM SA1110 Developer's Manual",
* section 10.8, "Alternate Memory Bus Master Mode". */
GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
GAFR |= GPIO_MBGNT | GPIO_MBREQ;
TUCR |= TUCR_MBGPIO;
}
return ret;
}
static struct hw_pci nanoengine_pci __initdata = {
.map_irq = pci_nanoengine_map_irq,
.nr_controllers = 1,
.ops = &pci_nano_ops,
.setup = pci_nanoengine_setup,
};
static int __init nanoengine_pci_init(void)
{
if (machine_is_nanoengine())
pci_common_init(&nanoengine_pci);
return 0;
}
subsys_initcall(nanoengine_pci_init);
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