arch/arm/mach-sa1100/pci-nanoengine.c - linux - Git at Google

 /*
  * 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(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);
	/*
	* 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(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);