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linux/arch/mips/pci/ops-pmcmsp.c
Yong Zhang 8b5690f884 MIPS: irq: Remove IRQF_DISABLED 
Since commit [e58aa3d2: genirq: Run irq handlers with interrupts disabled],
We run all interrupt handlers with interrupts disabled and we even check
and yell when an interrupt handler returns with interrupts enabled (see
commit [b738a50a: genirq: Warn when handler enables interrupts]).

So now this flag is a NOOP and can be removed.

[ralf@linux-mips.org: Fixed up conflicts in
arch/mips/alchemy/common/dbdma.c, arch/mips/cavium-octeon/smp.c and
arch/mips/kernel/perf_event.c.]

Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: tglx@linutronix.de
linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2835/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-12-07 22:03:45 +00:00

999 lines
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/*
* PMC-Sierra MSP board specific pci_ops
*
* Copyright 2001 MontaVista Software Inc.
* Copyright 2005-2007 PMC-Sierra, Inc
*
* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
*
* Much of the code is derived from the original DDB5074 port by
* Geert Uytterhoeven <geert@sonycom.com>
*
* 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.
*
*/
#define PCI_COUNTERS 1
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS)
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#endif /* CONFIG_PROC_FS && PCI_COUNTERS */
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/byteorder.h>
#if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
#include <asm/mipsmtregs.h>
#endif
#include <msp_prom.h>
#include <msp_cic_int.h>
#include <msp_pci.h>
#include <msp_regs.h>
#include <msp_regops.h>
#define PCI_ACCESS_READ 0
#define PCI_ACCESS_WRITE 1
#if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS)
static char proc_init;
extern struct proc_dir_entry *proc_bus_pci_dir;
unsigned int pci_int_count[32];
static void pci_proc_init(void);
/*****************************************************************************
*
* FUNCTION: read_msp_pci_counts
* _________________________________________________________________________
*
* DESCRIPTION: Prints the count of how many times each PCI
* interrupt has asserted. Can be invoked by the
* /proc filesystem.
*
* INPUTS: page - part of STDOUT calculation
* off - part of STDOUT calculation
* count - part of STDOUT calculation
* data - unused
*
* OUTPUTS: start - new start location
* eof - end of file pointer
*
* RETURNS: len - STDOUT length
*
****************************************************************************/
static int read_msp_pci_counts(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
int i;
int len = 0;
unsigned int intcount, total = 0;
for (i = 0; i < 32; ++i) {
intcount = pci_int_count[i];
if (intcount != 0) {
len += sprintf(page + len, "[%d] = %u\n", i, intcount);
total += intcount;
}
}
len += sprintf(page + len, "total = %u\n", total);
if (len <= off+count)
*eof = 1;
*start = page + off;
len -= off;
if (len > count)
len = count;
if (len < 0)
len = 0;
return len;
}
/*****************************************************************************
*
* FUNCTION: gen_pci_cfg_wr
* _________________________________________________________________________
*
* DESCRIPTION: Generates a configuration write cycle for debug purposes.
* The IDSEL line asserted and location and data written are
* immaterial. Just want to be able to prove that a
* configuration write can be correctly generated on the
* PCI bus. Intent is that this function by invocable from
* the /proc filesystem.
*
* INPUTS: page - part of STDOUT calculation
* off - part of STDOUT calculation
* count - part of STDOUT calculation
* data - unused
*
* OUTPUTS: start - new start location
* eof - end of file pointer
*
* RETURNS: len - STDOUT length
*
****************************************************************************/
static int gen_pci_cfg_wr(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
unsigned char where = 0; /* Write to static Device/Vendor ID */
unsigned char bus_num = 0; /* Bus 0 */
unsigned char dev_fn = 0xF; /* Arbitrary device number */
u32 wr_data = 0xFF00AA00; /* Arbitrary data */
struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
int len = 0;
unsigned long value;
int intr;
len += sprintf(page + len, "PMC MSP PCI: Beginning\n");
if (proc_init == 0) {
pci_proc_init();
proc_init = ~0;
}
len += sprintf(page + len, "PMC MSP PCI: Before Cfg Wr\n");
/*
* Generate PCI Configuration Write Cycle
*/
/* Clear cause register bits */
preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F);
/* Setup address that is to appear on PCI bus */
preg->config_addr = BPCI_CFGADDR_ENABLE |
(bus_num << BPCI_CFGADDR_BUSNUM_SHF) |
(dev_fn << BPCI_CFGADDR_FUNCTNUM_SHF) |
(where & 0xFC);
value = cpu_to_le32(wr_data);
/* Launch the PCI configuration write cycle */
*PCI_CONFIG_SPACE_REG = value;
/*
* Check if the PCI configuration cycle (rd or wr) succeeded, by
* checking the status bits for errors like master or target abort.
*/
intr = preg->if_status;
len += sprintf(page + len, "PMC MSP PCI: After Cfg Wr\n");
/* Handle STDOUT calculations */
if (len <= off+count)
*eof = 1;
*start = page + off;
len -= off;
if (len > count)
len = count;
if (len < 0)
len = 0;
return len;
}
/*****************************************************************************
*
* FUNCTION: pci_proc_init
* _________________________________________________________________________
*
* DESCRIPTION: Create entries in the /proc filesystem for debug access.
*
* INPUTS: none
*
* OUTPUTS: none
*
* RETURNS: none
*
****************************************************************************/
static void pci_proc_init(void)
{
create_proc_read_entry("pmc_msp_pci_rd_cnt", 0, NULL,
read_msp_pci_counts, NULL);
create_proc_read_entry("pmc_msp_pci_cfg_wr", 0, NULL,
gen_pci_cfg_wr, NULL);
}
#endif /* CONFIG_PROC_FS && PCI_COUNTERS */
static DEFINE_SPINLOCK(bpci_lock);
/*****************************************************************************
*
* STRUCT: pci_io_resource
* _________________________________________________________________________
*
* DESCRIPTION: Defines the address range that pciauto() will use to
* assign to the I/O BARs of PCI devices.
*
* Use the start and end addresses of the MSP7120 PCI Host
* Controller I/O space, in the form that they appear on the
* PCI bus AFTER MSP7120 has performed address translation.
*
* For I/O accesses, MSP7120 ignores OATRAN and maps I/O
* accesses into the bottom 0xFFF region of address space,
* so that is the range to put into the pci_io_resource
* struct.
*
* In MSP4200, the start address was 0x04 instead of the
* expected 0x00. Will just assume there was a good reason
* for this!
*
* NOTES: Linux, by default, will assign I/O space to the lowest
* region of address space. Since MSP7120 and Linux,
* by default, have no offset in between how they map, the
* io_offset element of pci_controller struct should be set
* to zero.
* ELEMENTS:
* name - String used for a meaningful name.
*
* start - Start address of MSP7120's I/O space, as MSP7120 presents
* the address on the PCI bus.
*
* end - End address of MSP7120's I/O space, as MSP7120 presents
* the address on the PCI bus.
*
* flags - Attributes indicating the type of resource. In this case,
* indicate I/O space.
*
****************************************************************************/
static struct resource pci_io_resource = {
.name = "pci IO space",
.start = 0x04,
.end = 0x0FFF,
.flags = IORESOURCE_IO /* I/O space */
};
/*****************************************************************************
*
* STRUCT: pci_mem_resource
* _________________________________________________________________________
*
* DESCRIPTION: Defines the address range that pciauto() will use to
* assign to the memory BARs of PCI devices.
*
* The .start and .end values are dependent upon how address
* translation is performed by the OATRAN regiser.
*
* The values to use for .start and .end are the values
* in the form they appear on the PCI bus AFTER MSP7120 has
* performed OATRAN address translation.
*
* ELEMENTS:
* name - String used for a meaningful name.
*
* start - Start address of MSP7120's memory space, as MSP7120 presents
* the address on the PCI bus.
*
* end - End address of MSP7120's memory space, as MSP7120 presents
* the address on the PCI bus.
*
* flags - Attributes indicating the type of resource. In this case,
* indicate memory space.
*
****************************************************************************/
static struct resource pci_mem_resource = {
.name = "pci memory space",
.start = MSP_PCI_SPACE_BASE,
.end = MSP_PCI_SPACE_END,
.flags = IORESOURCE_MEM /* memory space */
};
/*****************************************************************************
*
* FUNCTION: bpci_interrupt
* _________________________________________________________________________
*
* DESCRIPTION: PCI status interrupt handler. Updates the count of how
* many times each status bit has been set, then clears
* the status bits. If the appropriate macros are defined,
* these counts can be viewed via the /proc filesystem.
*
* INPUTS: irq - unused
* dev_id - unused
* pt_regs - unused
*
* OUTPUTS: none
*
* RETURNS: PCIBIOS_SUCCESSFUL - success
*
****************************************************************************/
static irqreturn_t bpci_interrupt(int irq, void *dev_id)
{
struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
unsigned int stat = preg->if_status;
#if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS)
int i;
for (i = 0; i < 32; ++i) {
if ((1 << i) & stat)
++pci_int_count[i];
}
#endif /* PROC_FS && PCI_COUNTERS */
/* printk("PCI ISR: Status=%08X\n", stat); */
/* write to clear all asserted interrupts */
preg->if_status = stat;
return IRQ_HANDLED;
}
/*****************************************************************************
*
* FUNCTION: msp_pcibios_config_access
* _________________________________________________________________________
*
* DESCRIPTION: Performs a PCI configuration access (rd or wr), then
* checks that the access succeeded by querying MSP7120's
* PCI status bits.
*
* INPUTS:
* access_type - kind of PCI configuration cycle to perform
* (read or write). Legal values are
* PCI_ACCESS_WRITE and PCI_ACCESS_READ.
*
* bus - pointer to the bus number of the device to
* be targeted for the configuration cycle.
* The only element of the pci_bus structure
* used is bus->number. This argument determines
* if the configuration access will be Type 0 or
* Type 1. Since MSP7120 assumes itself to be the
* PCI Host, any non-zero bus->number generates
* a Type 1 access.
*
* devfn - this is an 8-bit field. The lower three bits
* specify the function number of the device to
* be targeted for the configuration cycle, with
* all three-bit combinations being legal. The
* upper five bits specify the device number,
* with legal values being 10 to 31.
*
* where - address within the Configuration Header
* space to access.
*
* data - for write accesses, contains the data to
* write.
*
* OUTPUTS:
* data - for read accesses, contains the value read.
*
* RETURNS: PCIBIOS_SUCCESSFUL - success
* -1 - access failure
*
****************************************************************************/
int msp_pcibios_config_access(unsigned char access_type,
struct pci_bus *bus,
unsigned int devfn,
unsigned char where,
u32 *data)
{
struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
unsigned char bus_num = bus->number;
unsigned char dev_fn = (unsigned char)devfn;
unsigned long flags;
unsigned long intr;
unsigned long value;
static char pciirqflag;
int ret;
#if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
unsigned int vpe_status;
#endif
#if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS)
if (proc_init == 0) {
pci_proc_init();
proc_init = ~0;
}
#endif /* CONFIG_PROC_FS && PCI_COUNTERS */
/*
* Just the first time this function invokes, allocate
* an interrupt line for PCI host status interrupts. The
* allocation assigns an interrupt handler to the interrupt.
*/
if (pciirqflag == 0) {
ret = request_irq(MSP_INT_PCI,/* Hardcoded internal MSP7120 wiring */
bpci_interrupt,
IRQF_SHARED,
"PMC MSP PCI Host",
preg);
if (ret != 0)
return ret;
pciirqflag = ~0;
}
#if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
local_irq_save(flags);
vpe_status = dvpe();
#else
spin_lock_irqsave(&bpci_lock, flags);
#endif
/*
* Clear PCI cause register bits.
*
* In Polo, the PCI Host had a dedicated DMA called the
* Block Copy (not to be confused with the general purpose Block
* Copy Engine block). There appear to have been special interrupts
* for this Block Copy, called Block Copy 0 Fault (BC0F) and
* Block Copy 1 Fault (BC1F). MSP4200 and MSP7120 don't have this
* dedicated Block Copy block, so these two interrupts are now
* marked reserved. In case the Block Copy is resurrected in a
* future design, maintain the code that treats these two interrupts
* specially.
*
* Write to clear all interrupts in the PCI status register, aside
* from BC0F and BC1F.
*/
preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F);
/* Setup address that is to appear on PCI bus */
preg->config_addr = BPCI_CFGADDR_ENABLE |
(bus_num << BPCI_CFGADDR_BUSNUM_SHF) |
(dev_fn << BPCI_CFGADDR_FUNCTNUM_SHF) |
(where & 0xFC);
/* IF access is a PCI configuration write */
if (access_type == PCI_ACCESS_WRITE) {
value = cpu_to_le32(*data);
*PCI_CONFIG_SPACE_REG = value;
} else {
/* ELSE access is a PCI configuration read */
value = le32_to_cpu(*PCI_CONFIG_SPACE_REG);
*data = value;
}
/*
* Check if the PCI configuration cycle (rd or wr) succeeded, by
* checking the status bits for errors like master or target abort.
*/
intr = preg->if_status;
/* Clear config access */
preg->config_addr = 0;
/* IF error occurred */
if (intr & ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F)) {
/* Clear status bits */
preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F);
#if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
evpe(vpe_status);
local_irq_restore(flags);
#else
spin_unlock_irqrestore(&bpci_lock, flags);
#endif
return -1;
}
#if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
evpe(vpe_status);
local_irq_restore(flags);
#else
spin_unlock_irqrestore(&bpci_lock, flags);
#endif
return PCIBIOS_SUCCESSFUL;
}
/*****************************************************************************
*
* FUNCTION: msp_pcibios_read_config_byte
* _________________________________________________________________________
*
* DESCRIPTION: Read a byte from PCI configuration address spac
* Since the hardware can't address 8 bit chunks
* directly, read a 32-bit chunk, then mask off extraneous
* bits.
*
* INPUTS bus - structure containing attributes for the PCI bus
* that the read is destined for.
* devfn - device/function combination that the read is
* destined for.
* where - register within the Configuration Header space
* to access.
*
* OUTPUTS val - read data
*
* RETURNS: PCIBIOS_SUCCESSFUL - success
* -1 - read access failure
*
****************************************************************************/
static int
msp_pcibios_read_config_byte(struct pci_bus *bus,
unsigned int devfn,
int where,
u32 *val)
{
u32 data = 0;
/*
* If the config access did not complete normally (e.g., underwent
* master abort) do the PCI compliant thing, which is to supply an
* all ones value.
*/
if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
where, &data)) {
*val = 0xFFFFFFFF;
return -1;
}
*val = (data >> ((where & 3) << 3)) & 0x0ff;
return PCIBIOS_SUCCESSFUL;
}
/*****************************************************************************
*
* FUNCTION: msp_pcibios_read_config_word
* _________________________________________________________________________
*
* DESCRIPTION: Read a word (16 bits) from PCI configuration address space.
* Since the hardware can't address 16 bit chunks
* directly, read a 32-bit chunk, then mask off extraneous
* bits.
*
* INPUTS bus - structure containing attributes for the PCI bus
* that the read is destined for.
* devfn - device/function combination that the read is
* destined for.
* where - register within the Configuration Header space
* to access.
*
* OUTPUTS val - read data
*
* RETURNS: PCIBIOS_SUCCESSFUL - success
* PCIBIOS_BAD_REGISTER_NUMBER - bad register address
* -1 - read access failure
*
****************************************************************************/
static int
msp_pcibios_read_config_word(struct pci_bus *bus,
unsigned int devfn,
int where,
u32 *val)
{
u32 data = 0;
/* if (where & 1) */ /* Commented out non-compliant code.
* Should allow word access to configuration
* registers, with only exception being when
* the word access would wrap around into
* the next dword.
*/
if ((where & 3) == 3) {
*val = 0xFFFFFFFF;
return PCIBIOS_BAD_REGISTER_NUMBER;
}
/*
* If the config access did not complete normally (e.g., underwent
* master abort) do the PCI compliant thing, which is to supply an
* all ones value.
*/
if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
where, &data)) {
*val = 0xFFFFFFFF;
return -1;
}
*val = (data >> ((where & 3) << 3)) & 0x0ffff;
return PCIBIOS_SUCCESSFUL;
}
/*****************************************************************************
*
* FUNCTION: msp_pcibios_read_config_dword
* _________________________________________________________________________
*
* DESCRIPTION: Read a double word (32 bits) from PCI configuration
* address space.
*
* INPUTS bus - structure containing attributes for the PCI bus
* that the read is destined for.
* devfn - device/function combination that the read is
* destined for.
* where - register within the Configuration Header space
* to access.
*
* OUTPUTS val - read data
*
* RETURNS: PCIBIOS_SUCCESSFUL - success
* PCIBIOS_BAD_REGISTER_NUMBER - bad register address
* -1 - read access failure
*
****************************************************************************/
static int
msp_pcibios_read_config_dword(struct pci_bus *bus,
unsigned int devfn,
int where,
u32 *val)
{
u32 data = 0;
/* Address must be dword aligned. */
if (where & 3) {
*val = 0xFFFFFFFF;
return PCIBIOS_BAD_REGISTER_NUMBER;
}
/*
* If the config access did not complete normally (e.g., underwent
* master abort) do the PCI compliant thing, which is to supply an
* all ones value.
*/
if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
where, &data)) {
*val = 0xFFFFFFFF;
return -1;
}
*val = data;
return PCIBIOS_SUCCESSFUL;
}
/*****************************************************************************
*
* FUNCTION: msp_pcibios_write_config_byte
* _________________________________________________________________________
*
* DESCRIPTION: Write a byte to PCI configuration address space.
* Since the hardware can't address 8 bit chunks
* directly, a read-modify-write is performed.
*
* INPUTS bus - structure containing attributes for the PCI bus
* that the write is destined for.
* devfn - device/function combination that the write is
* destined for.
* where - register within the Configuration Header space
* to access.
* val - value to write
*
* OUTPUTS none
*
* RETURNS: PCIBIOS_SUCCESSFUL - success
* -1 - write access failure
*
****************************************************************************/
static int
msp_pcibios_write_config_byte(struct pci_bus *bus,
unsigned int devfn,
int where,
u8 val)
{
u32 data = 0;
/* read config space */
if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
where, &data))
return -1;
/* modify the byte within the dword */
data = (data & ~(0xff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
/* write back the full dword */
if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
where, &data))
return -1;
return PCIBIOS_SUCCESSFUL;
}
/*****************************************************************************
*
* FUNCTION: msp_pcibios_write_config_word
* _________________________________________________________________________
*
* DESCRIPTION: Write a word (16-bits) to PCI configuration address space.
* Since the hardware can't address 16 bit chunks
* directly, a read-modify-write is performed.
*
* INPUTS bus - structure containing attributes for the PCI bus
* that the write is destined for.
* devfn - device/function combination that the write is
* destined for.
* where - register within the Configuration Header space
* to access.
* val - value to write
*
* OUTPUTS none
*
* RETURNS: PCIBIOS_SUCCESSFUL - success
* PCIBIOS_BAD_REGISTER_NUMBER - bad register address
* -1 - write access failure
*
****************************************************************************/
static int
msp_pcibios_write_config_word(struct pci_bus *bus,
unsigned int devfn,
int where,
u16 val)
{
u32 data = 0;
/* Fixed non-compliance: if (where & 1) */
if ((where & 3) == 3)
return PCIBIOS_BAD_REGISTER_NUMBER;
/* read config space */
if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
where, &data))
return -1;
/* modify the word within the dword */
data = (data & ~(0xffff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
/* write back the full dword */
if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
where, &data))
return -1;
return PCIBIOS_SUCCESSFUL;
}
/*****************************************************************************
*
* FUNCTION: msp_pcibios_write_config_dword
* _________________________________________________________________________
*
* DESCRIPTION: Write a double word (32-bits) to PCI configuration address
* space.
*
* INPUTS bus - structure containing attributes for the PCI bus
* that the write is destined for.
* devfn - device/function combination that the write is
* destined for.
* where - register within the Configuration Header space
* to access.
* val - value to write
*
* OUTPUTS none
*
* RETURNS: PCIBIOS_SUCCESSFUL - success
* PCIBIOS_BAD_REGISTER_NUMBER - bad register address
* -1 - write access failure
*
****************************************************************************/
static int
msp_pcibios_write_config_dword(struct pci_bus *bus,
unsigned int devfn,
int where,
u32 val)
{
/* check that address is dword aligned */
if (where & 3)
return PCIBIOS_BAD_REGISTER_NUMBER;
/* perform write */
if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
where, &val))
return -1;
return PCIBIOS_SUCCESSFUL;
}
/*****************************************************************************
*
* FUNCTION: msp_pcibios_read_config
* _________________________________________________________________________
*
* DESCRIPTION: Interface the PCI configuration read request with
* the appropriate function, based on how many bytes
* the read request is.
*
* INPUTS bus - structure containing attributes for the PCI bus
* that the write is destined for.
* devfn - device/function combination that the write is
* destined for.
* where - register within the Configuration Header space
* to access.
* size - in units of bytes, should be 1, 2, or 4.
*
* OUTPUTS val - value read, with any extraneous bytes masked
* to zero.
*
* RETURNS: PCIBIOS_SUCCESSFUL - success
* -1 - failure
*
****************************************************************************/
int
msp_pcibios_read_config(struct pci_bus *bus,
unsigned int devfn,
int where,
int size,
u32 *val)
{
if (size == 1) {
if (msp_pcibios_read_config_byte(bus, devfn, where, val)) {
return -1;
}
} else if (size == 2) {
if (msp_pcibios_read_config_word(bus, devfn, where, val)) {
return -1;
}
} else if (size == 4) {
if (msp_pcibios_read_config_dword(bus, devfn, where, val)) {
return -1;
}
} else {
*val = 0xFFFFFFFF;
return -1;
}
return PCIBIOS_SUCCESSFUL;
}
/*****************************************************************************
*
* FUNCTION: msp_pcibios_write_config
* _________________________________________________________________________
*
* DESCRIPTION: Interface the PCI configuration write request with
* the appropriate function, based on how many bytes
* the read request is.
*
* INPUTS bus - structure containing attributes for the PCI bus
* that the write is destined for.
* devfn - device/function combination that the write is
* destined for.
* where - register within the Configuration Header space
* to access.
* size - in units of bytes, should be 1, 2, or 4.
* val - value to write
*
* OUTPUTS: none
*
* RETURNS: PCIBIOS_SUCCESSFUL - success
* -1 - failure
*
****************************************************************************/
int
msp_pcibios_write_config(struct pci_bus *bus,
unsigned int devfn,
int where,
int size,
u32 val)
{
if (size == 1) {
if (msp_pcibios_write_config_byte(bus, devfn,
where, (u8)(0xFF & val))) {
return -1;
}
} else if (size == 2) {
if (msp_pcibios_write_config_word(bus, devfn,
where, (u16)(0xFFFF & val))) {
return -1;
}
} else if (size == 4) {
if (msp_pcibios_write_config_dword(bus, devfn, where, val)) {
return -1;
}
} else {
return -1;
}
return PCIBIOS_SUCCESSFUL;
}
/*****************************************************************************
*
* STRUCTURE: msp_pci_ops
* _________________________________________________________________________
*
* DESCRIPTION: structure to abstract the hardware specific PCI
* configuration accesses.
*
* ELEMENTS:
* read - function for Linux to generate PCI Configuration reads.
* write - function for Linux to generate PCI Configuration writes.
*
****************************************************************************/
struct pci_ops msp_pci_ops = {
.read = msp_pcibios_read_config,
.write = msp_pcibios_write_config
};
/*****************************************************************************
*
* STRUCTURE: msp_pci_controller
* _________________________________________________________________________
*
* Describes the attributes of the MSP7120 PCI Host Controller
*
* ELEMENTS:
* pci_ops - abstracts the hardware specific PCI configuration
* accesses.
*
* mem_resource - address range pciauto() uses to assign to PCI device
* memory BARs.
*
* mem_offset - offset between how MSP7120 outbound PCI memory
* transaction addresses appear on the PCI bus and how Linux
* wants to configure memory BARs of the PCI devices.
* MSP7120 does nothing funky, so just set to zero.
*
* io_resource - address range pciauto() uses to assign to PCI device
* I/O BARs.
*
* io_offset - offset between how MSP7120 outbound PCI I/O
* transaction addresses appear on the PCI bus and how
* Linux defaults to configure I/O BARs of the PCI devices.
* MSP7120 maps outbound I/O accesses into the bottom
* bottom 4K of PCI address space (and ignores OATRAN).
* Since the Linux default is to configure I/O BARs to the
* bottom 4K, no special offset is needed. Just set to zero.
*
****************************************************************************/
static struct pci_controller msp_pci_controller = {
.pci_ops = &msp_pci_ops,
.mem_resource = &pci_mem_resource,
.mem_offset = 0,
.io_map_base = MSP_PCI_IOSPACE_BASE,
.io_resource = &pci_io_resource,
.io_offset = 0
};
/*****************************************************************************
*
* FUNCTION: msp_pci_init
* _________________________________________________________________________
*
* DESCRIPTION: Initialize the PCI Host Controller and register it with
* Linux so Linux can seize control of the PCI bus.
*
****************************************************************************/
void __init msp_pci_init(void)
{
struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
u32 id;
/* Extract Device ID */
id = read_reg32(PCI_JTAG_DEVID_REG, 0xFFFF) >> 12;
/* Check if JTAG ID identifies MSP7120 */
if (!MSP_HAS_PCI(id)) {
printk(KERN_WARNING "PCI: No PCI; id reads as %x\n", id);
goto no_pci;
}
/*
* Enable flushing of the PCI-SDRAM queue upon a read
* of the SDRAM's Memory Configuration Register.
*/
*(unsigned long *)QFLUSH_REG_1 = 3;
/* Configure PCI Host Controller. */
preg->if_status = ~0; /* Clear cause register bits */
preg->config_addr = 0; /* Clear config access */
preg->oatran = MSP_PCI_OATRAN; /* PCI outbound addr translation */
preg->if_mask = 0xF8BF87C0; /* Enable all PCI status interrupts */
/* configure so inb(), outb(), and family are functional */
set_io_port_base(MSP_PCI_IOSPACE_BASE);
/* Tell Linux the details of the MSP7120 PCI Host Controller */
register_pci_controller(&msp_pci_controller);
return;
no_pci:
/* Disable PCI channel */
printk(KERN_WARNING "PCI: no host PCI bus detected\n");
}
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