forked from Minki/linux
2874c5fd28
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
945 lines
28 KiB
C
945 lines
28 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* 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@linux-m68k.org>
|
|
*/
|
|
|
|
#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: show_msp_pci_counts
|
|
* _________________________________________________________________________
|
|
*
|
|
* DESCRIPTION: Prints the count of how many times each PCI
|
|
* interrupt has asserted. Can be invoked by the
|
|
* /proc filesystem.
|
|
*
|
|
* INPUTS: m - synthetic file construction data
|
|
* v - iterator
|
|
*
|
|
* RETURNS: 0 or error
|
|
*
|
|
****************************************************************************/
|
|
static int show_msp_pci_counts(struct seq_file *m, void *v)
|
|
{
|
|
int i;
|
|
unsigned int intcount, total = 0;
|
|
|
|
for (i = 0; i < 32; ++i) {
|
|
intcount = pci_int_count[i];
|
|
if (intcount != 0) {
|
|
seq_printf(m, "[%d] = %u\n", i, intcount);
|
|
total += intcount;
|
|
}
|
|
}
|
|
|
|
seq_printf(m, "total = %u\n", total);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* FUNCTION: gen_pci_cfg_wr_show
|
|
* _________________________________________________________________________
|
|
*
|
|
* 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: m - synthetic file construction data
|
|
* v - iterator
|
|
*
|
|
* RETURNS: 0 or error
|
|
*
|
|
****************************************************************************/
|
|
static int gen_pci_cfg_wr_show(struct seq_file *m, void *v)
|
|
{
|
|
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;
|
|
unsigned long value;
|
|
int intr;
|
|
|
|
seq_puts(m, "PMC MSP PCI: Beginning\n");
|
|
|
|
if (proc_init == 0) {
|
|
pci_proc_init();
|
|
proc_init = ~0;
|
|
}
|
|
|
|
seq_puts(m, "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;
|
|
|
|
seq_puts(m, "PMC MSP PCI: After Cfg Wr\n");
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* 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)
|
|
{
|
|
proc_create_single("pmc_msp_pci_rd_cnt", 0, NULL, show_msp_pci_counts);
|
|
proc_create_single("pmc_msp_pci_cfg_wr", 0, NULL, gen_pci_cfg_wr_show);
|
|
}
|
|
#endif /* CONFIG_PROC_FS && PCI_COUNTERS */
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* 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 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)
|
|
vpe_status = dvpe();
|
|
#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);
|
|
#endif
|
|
|
|
return -1;
|
|
}
|
|
|
|
#if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
|
|
evpe(vpe_status);
|
|
#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");
|
|
}
|