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linux/arch/arm/mach-sa1100/pci-nanoengine.c
Linus Walleij ac9cf9ff4f mach-sa1100: fix PCI build problem 
The PCI nanoengine driver in the SA1100 machine probably has not
been building for some time. It probably dragged hardware.h
in implicitly and now it doesn't anymore. After this an SA1100
build selecting all system variants will build successfully.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2011-08-10 16:00:48 +00:00

290 lines
9.0 KiB
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/*
* 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>
*
* 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
*/
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <asm/mach/pci.h>
#include <asm/mach-types.h>
#include <mach/nanoengine.h>
#include <mach/hardware.h>
static DEFINE_SPINLOCK(nano_lock);
static int nanoengine_get_pci_address(struct pci_bus *bus,
unsigned int devfn, int where, unsigned long *address)
{
int ret = PCIBIOS_DEVICE_NOT_FOUND;
unsigned int busnr = bus->number;
*address = NANO_PCI_CONFIG_SPACE_VIRT +
((bus->number << 16) | (devfn << 8) | (where & ~3));
ret = (busnr > 255 || devfn > 255 || where > 255) ?
PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
return ret;
}
static int nanoengine_read_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 *val)
{
int ret;
unsigned long address;
unsigned long flags;
u32 v;
/* nanoEngine PCI bridge does not return -1 for a non-existing
* device. We must fake the answer. We know that the only valid
* device is device zero at bus 0, which is the network chip. */
if (bus->number != 0 || (devfn >> 3) != 0) {
v = -1;
nanoengine_get_pci_address(bus, devfn, where, &address);
goto exit_function;
}
spin_lock_irqsave(&nano_lock, flags);
ret = nanoengine_get_pci_address(bus, devfn, where, &address);
if (ret != PCIBIOS_SUCCESSFUL)
return ret;
v = __raw_readl(address);
spin_unlock_irqrestore(&nano_lock, flags);
v >>= ((where & 3) * 8);
v &= (unsigned long)(-1) >> ((4 - size) * 8);
exit_function:
*val = v;
return PCIBIOS_SUCCESSFUL;
}
static int nanoengine_write_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 val)
{
int ret;
unsigned long address;
unsigned long flags;
unsigned shift;
u32 v;
shift = (where & 3) * 8;
spin_lock_irqsave(&nano_lock, flags);
ret = nanoengine_get_pci_address(bus, devfn, where, &address);
if (ret != PCIBIOS_SUCCESSFUL)
return ret;
v = __raw_readl(address);
switch (size) {
case 1:
v &= ~(0xFF << shift);
v |= val << shift;
break;
case 2:
v &= ~(0xFFFF << shift);
v |= val << shift;
break;
case 4:
v = val;
break;
}
__raw_writel(v, address);
spin_unlock_irqrestore(&nano_lock, flags);
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops pci_nano_ops = {
.read = nanoengine_read_config,
.write = nanoengine_write_config,
};
static int __init pci_nanoengine_map_irq(const struct pci_dev *dev, u8 slot,
u8 pin)
{
return NANOENGINE_IRQ_GPIO_PCI;
}
struct pci_bus * __init pci_nanoengine_scan_bus(int nr, struct pci_sys_data *sys)
{
return pci_scan_bus(sys->busnr, &pci_nano_ops, sys);
}
static struct resource pci_io_ports = {
.name = "PCI IO",
.start = 0x400,
.end = 0x7FF,
.flags = IORESOURCE_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 resource **resource)
{
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;
}
resource[0] = &pci_io_ports;
resource[1] = &pci_non_prefetchable_memory;
resource[2] = &pci_prefetchable_memory;
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->resource);
/* 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,
.scan = pci_nanoengine_scan_bus,
.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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