diff options
Diffstat (limited to 'arch/arm/mach-sa1100/pci-nanoengine.c')
| -rw-r--r-- | arch/arm/mach-sa1100/pci-nanoengine.c | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/arch/arm/mach-sa1100/pci-nanoengine.c b/arch/arm/mach-sa1100/pci-nanoengine.c new file mode 100644 index 00000000..fba7a913 --- /dev/null +++ b/arch/arm/mach-sa1100/pci-nanoengine.c @@ -0,0 +1,284 @@ +/* + * 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> + +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(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; + + 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); |