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linux-stable/arch/arm/common/it8152.c
FUJITA Tomonori 710224fa27 arm: fix "arm: fix pci_set_consistent_dma_mask for dmabounce devices" 
This fixes the regression caused by the commit 6fee48cd33
("dma-mapping: arm: use generic pci_set_dma_mask and
pci_set_consistent_dma_mask").

ARM needs to clip the dma coherent mask for dmabounce devices. This
restores the old trick.

Note that strictly speaking, the DMA API doesn't allow architectures to do
such but I'm not sure it's worth adding the new API to set the dma mask
that allows architectures to clip it.

Reported-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-22 17:22:38 -07:00

354 lines
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/*
* linux/arch/arm/common/it8152.c
*
* Copyright Compulab Ltd, 2002-2007
* Mike Rapoport <mike@compulab.co.il>
*
* The DMA bouncing part is taken from arch/arm/mach-ixp4xx/common-pci.c
* (see this file for respective copyrights)
*
* Thanks to Guennadi Liakhovetski <gl@dsa-ac.de> for IRQ enumberation
* and demux code.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ptrace.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/mach/pci.h>
#include <asm/hardware/it8152.h>
#define MAX_SLOTS 21
static void it8152_mask_irq(unsigned int irq)
{
if (irq >= IT8152_LD_IRQ(0)) {
__raw_writel((__raw_readl(IT8152_INTC_LDCNIMR) |
(1 << (irq - IT8152_LD_IRQ(0)))),
IT8152_INTC_LDCNIMR);
} else if (irq >= IT8152_LP_IRQ(0)) {
__raw_writel((__raw_readl(IT8152_INTC_LPCNIMR) |
(1 << (irq - IT8152_LP_IRQ(0)))),
IT8152_INTC_LPCNIMR);
} else if (irq >= IT8152_PD_IRQ(0)) {
__raw_writel((__raw_readl(IT8152_INTC_PDCNIMR) |
(1 << (irq - IT8152_PD_IRQ(0)))),
IT8152_INTC_PDCNIMR);
}
}
static void it8152_unmask_irq(unsigned int irq)
{
if (irq >= IT8152_LD_IRQ(0)) {
__raw_writel((__raw_readl(IT8152_INTC_LDCNIMR) &
~(1 << (irq - IT8152_LD_IRQ(0)))),
IT8152_INTC_LDCNIMR);
} else if (irq >= IT8152_LP_IRQ(0)) {
__raw_writel((__raw_readl(IT8152_INTC_LPCNIMR) &
~(1 << (irq - IT8152_LP_IRQ(0)))),
IT8152_INTC_LPCNIMR);
} else if (irq >= IT8152_PD_IRQ(0)) {
__raw_writel((__raw_readl(IT8152_INTC_PDCNIMR) &
~(1 << (irq - IT8152_PD_IRQ(0)))),
IT8152_INTC_PDCNIMR);
}
}
static struct irq_chip it8152_irq_chip = {
.name = "it8152",
.ack = it8152_mask_irq,
.mask = it8152_mask_irq,
.unmask = it8152_unmask_irq,
};
void it8152_init_irq(void)
{
int irq;
__raw_writel((0xffff), IT8152_INTC_PDCNIMR);
__raw_writel((0), IT8152_INTC_PDCNIRR);
__raw_writel((0xffff), IT8152_INTC_LPCNIMR);
__raw_writel((0), IT8152_INTC_LPCNIRR);
__raw_writel((0xffff), IT8152_INTC_LDCNIMR);
__raw_writel((0), IT8152_INTC_LDCNIRR);
for (irq = IT8152_IRQ(0); irq <= IT8152_LAST_IRQ; irq++) {
set_irq_chip(irq, &it8152_irq_chip);
set_irq_handler(irq, handle_level_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
}
}
void it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
{
int bits_pd, bits_lp, bits_ld;
int i;
while (1) {
/* Read all */
bits_pd = __raw_readl(IT8152_INTC_PDCNIRR);
bits_lp = __raw_readl(IT8152_INTC_LPCNIRR);
bits_ld = __raw_readl(IT8152_INTC_LDCNIRR);
/* Ack */
__raw_writel((~bits_pd), IT8152_INTC_PDCNIRR);
__raw_writel((~bits_lp), IT8152_INTC_LPCNIRR);
__raw_writel((~bits_ld), IT8152_INTC_LDCNIRR);
if (!(bits_ld | bits_lp | bits_pd)) {
/* Re-read to guarantee, that there was a moment of
time, when they all three were 0. */
bits_pd = __raw_readl(IT8152_INTC_PDCNIRR);
bits_lp = __raw_readl(IT8152_INTC_LPCNIRR);
bits_ld = __raw_readl(IT8152_INTC_LDCNIRR);
if (!(bits_ld | bits_lp | bits_pd))
return;
}
bits_pd &= ((1 << IT8152_PD_IRQ_COUNT) - 1);
while (bits_pd) {
i = __ffs(bits_pd);
generic_handle_irq(IT8152_PD_IRQ(i));
bits_pd &= ~(1 << i);
}
bits_lp &= ((1 << IT8152_LP_IRQ_COUNT) - 1);
while (bits_lp) {
i = __ffs(bits_lp);
generic_handle_irq(IT8152_LP_IRQ(i));
bits_lp &= ~(1 << i);
}
bits_ld &= ((1 << IT8152_LD_IRQ_COUNT) - 1);
while (bits_ld) {
i = __ffs(bits_ld);
generic_handle_irq(IT8152_LD_IRQ(i));
bits_ld &= ~(1 << i);
}
}
}
/* mapping for on-chip devices */
int __init it8152_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
if ((dev->vendor == PCI_VENDOR_ID_ITE) &&
(dev->device == PCI_DEVICE_ID_ITE_8152)) {
if ((dev->class >> 8) == PCI_CLASS_MULTIMEDIA_AUDIO)
return IT8152_AUDIO_INT;
if ((dev->class >> 8) == PCI_CLASS_SERIAL_USB)
return IT8152_USB_INT;
if ((dev->class >> 8) == PCI_CLASS_SYSTEM_DMA)
return IT8152_CDMA_INT;
}
return 0;
}
static unsigned long it8152_pci_dev_base_address(struct pci_bus *bus,
unsigned int devfn)
{
unsigned long addr = 0;
if (bus->number == 0) {
if (devfn < PCI_DEVFN(MAX_SLOTS, 0))
addr = (devfn << 8);
} else
addr = (bus->number << 16) | (devfn << 8);
return addr;
}
static int it8152_pci_read_config(struct pci_bus *bus,
unsigned int devfn, int where,
int size, u32 *value)
{
unsigned long addr = it8152_pci_dev_base_address(bus, devfn);
u32 v;
int shift;
shift = (where & 3);
__raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
v = (__raw_readl(IT8152_PCI_CFG_DATA) >> (8 * (shift)));
*value = v;
return PCIBIOS_SUCCESSFUL;
}
static int it8152_pci_write_config(struct pci_bus *bus,
unsigned int devfn, int where,
int size, u32 value)
{
unsigned long addr = it8152_pci_dev_base_address(bus, devfn);
u32 v, vtemp, mask = 0;
int shift;
if (size == 1)
mask = 0xff;
if (size == 2)
mask = 0xffff;
shift = (where & 3);
__raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
vtemp = __raw_readl(IT8152_PCI_CFG_DATA);
if (mask)
vtemp &= ~(mask << (8 * shift));
else
vtemp = 0;
v = (value << (8 * shift));
__raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
__raw_writel((v | vtemp), IT8152_PCI_CFG_DATA);
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops it8152_ops = {
.read = it8152_pci_read_config,
.write = it8152_pci_write_config,
};
static struct resource it8152_io = {
.name = "IT8152 PCI I/O region",
.flags = IORESOURCE_IO,
};
static struct resource it8152_mem = {
.name = "IT8152 PCI memory region",
.start = 0x10000000,
.end = 0x13e00000,
.flags = IORESOURCE_MEM,
};
/*
* The following functions are needed for DMA bouncing.
* ITE8152 chip can addrees up to 64MByte, so all the devices
* connected to ITE8152 (PCI and USB) should have limited DMA window
*/
/*
* Setup DMA mask to 64MB on devices connected to ITE8152. Ignore all
* other devices.
*/
static int it8152_pci_platform_notify(struct device *dev)
{
if (dev->bus == &pci_bus_type) {
if (dev->dma_mask)
*dev->dma_mask = (SZ_64M - 1) | PHYS_OFFSET;
dev->coherent_dma_mask = (SZ_64M - 1) | PHYS_OFFSET;
dmabounce_register_dev(dev, 2048, 4096);
}
return 0;
}
static int it8152_pci_platform_notify_remove(struct device *dev)
{
if (dev->bus == &pci_bus_type)
dmabounce_unregister_dev(dev);
return 0;
}
int dma_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
{
dev_dbg(dev, "%s: dma_addr %08x, size %08x\n",
__func__, dma_addr, size);
return (dev->bus == &pci_bus_type) &&
((dma_addr + size - PHYS_OFFSET) >= SZ_64M);
}
int dma_set_coherent_mask(struct device *dev, u64 mask)
{
if (mask >= PHYS_OFFSET + SZ_64M - 1)
return 0;
return -EIO;
}
int __init it8152_pci_setup(int nr, struct pci_sys_data *sys)
{
it8152_io.start = IT8152_IO_BASE + 0x12000;
it8152_io.end = IT8152_IO_BASE + 0x12000 + 0x100000;
sys->mem_offset = 0x10000000;
sys->io_offset = IT8152_IO_BASE;
if (request_resource(&ioport_resource, &it8152_io)) {
printk(KERN_ERR "PCI: unable to allocate IO region\n");
goto err0;
}
if (request_resource(&iomem_resource, &it8152_mem)) {
printk(KERN_ERR "PCI: unable to allocate memory region\n");
goto err1;
}
sys->resource[0] = &it8152_io;
sys->resource[1] = &it8152_mem;
if (platform_notify || platform_notify_remove) {
printk(KERN_ERR "PCI: Can't use platform_notify\n");
goto err2;
}
platform_notify = it8152_pci_platform_notify;
platform_notify_remove = it8152_pci_platform_notify_remove;
return 1;
err2:
release_resource(&it8152_io);
err1:
release_resource(&it8152_mem);
err0:
return -EBUSY;
}
/*
* If we set up a device for bus mastering, we need to check the latency
* timer as we don't have even crappy BIOSes to set it properly.
* The implementation is from arch/i386/pci/i386.c
*/
unsigned int pcibios_max_latency = 255;
void pcibios_set_master(struct pci_dev *dev)
{
u8 lat;
/* no need to update on-chip OHCI controller */
if ((dev->vendor == PCI_VENDOR_ID_ITE) &&
(dev->device == PCI_DEVICE_ID_ITE_8152) &&
((dev->class >> 8) == PCI_CLASS_SERIAL_USB))
return;
pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
if (lat < 16)
lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
else if (lat > pcibios_max_latency)
lat = pcibios_max_latency;
else
return;
printk(KERN_DEBUG "PCI: Setting latency timer of device %s to %d\n",
pci_name(dev), lat);
pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
}
struct pci_bus * __init it8152_pci_scan_bus(int nr, struct pci_sys_data *sys)
{
return pci_scan_bus(nr, &it8152_ops, sys);
}
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