OpenSDV
/
linux-stable-rt
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
linux-stable-rt/drivers/mtd/devices/pmc551.c

844 lines
29 KiB
C
Raw Blame History

/*
* $Id: pmc551.c,v 1.30 2005/01/05 18:05:13 dwmw2 Exp $
*
* PMC551 PCI Mezzanine Ram Device
*
* Author:
* Mark Ferrell <mferrell@mvista.com>
* Copyright 1999,2000 Nortel Networks
*
* License:
* As part of this driver was derived from the slram.c driver it
* falls under the same license, which is GNU General Public
* License v2
*
* Description:
* This driver is intended to support the PMC551 PCI Ram device
* from Ramix Inc. The PMC551 is a PMC Mezzanine module for
* cPCI embedded systems. The device contains a single SROM
* that initially programs the V370PDC chipset onboard the
* device, and various banks of DRAM/SDRAM onboard. This driver
* implements this PCI Ram device as an MTD (Memory Technology
* Device) so that it can be used to hold a file system, or for
* added swap space in embedded systems. Since the memory on
* this board isn't as fast as main memory we do not try to hook
* it into main memory as that would simply reduce performance
* on the system. Using it as a block device allows us to use
* it as high speed swap or for a high speed disk device of some
* sort. Which becomes very useful on diskless systems in the
* embedded market I might add.
*
* Notes:
* Due to what I assume is more buggy SROM, the 64M PMC551 I
* have available claims that all 4 of it's DRAM banks have 64M
* of ram configured (making a grand total of 256M onboard).
* This is slightly annoying since the BAR0 size reflects the
* aperture size, not the dram size, and the V370PDC supplies no
* other method for memory size discovery. This problem is
* mostly only relevant when compiled as a module, as the
* unloading of the module with an aperture size smaller then
* the ram will cause the driver to detect the onboard memory
* size to be equal to the aperture size when the module is
* reloaded. Soooo, to help, the module supports an msize
* option to allow the specification of the onboard memory, and
* an asize option, to allow the specification of the aperture
* size. The aperture must be equal to or less then the memory
* size, the driver will correct this if you screw it up. This
* problem is not relevant for compiled in drivers as compiled
* in drivers only init once.
*
* Credits:
* Saeed Karamooz <saeed@ramix.com> of Ramix INC. for the
* initial example code of how to initialize this device and for
* help with questions I had concerning operation of the device.
*
* Most of the MTD code for this driver was originally written
* for the slram.o module in the MTD drivers package which
* allows the mapping of system memory into an MTD device.
* Since the PMC551 memory module is accessed in the same
* fashion as system memory, the slram.c code became a very nice
* fit to the needs of this driver. All we added was PCI
* detection/initialization to the driver and automatically figure
* out the size via the PCI detection.o, later changes by Corey
* Minyard set up the card to utilize a 1M sliding apature.
*
* Corey Minyard <minyard@nortelnetworks.com>
* * Modified driver to utilize a sliding aperture instead of
* mapping all memory into kernel space which turned out to
* be very wasteful.
* * Located a bug in the SROM's initialization sequence that
* made the memory unusable, added a fix to code to touch up
* the DRAM some.
*
* Bugs/FIXME's:
* * MUST fix the init function to not spin on a register
* waiting for it to set .. this does not safely handle busted
* devices that never reset the register correctly which will
* cause the system to hang w/ a reboot being the only chance at
* recover. [sort of fixed, could be better]
* * Add I2C handling of the SROM so we can read the SROM's information
* about the aperture size. This should always accurately reflect the
* onboard memory size.
* * Comb the init routine. It's still a bit cludgy on a few things.
*/
#include <linux/version.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <asm/io.h>
#include <asm/system.h>
#include <linux/pci.h>
#ifndef CONFIG_PCI
#error Enable PCI in your kernel config
#endif
#include <linux/mtd/mtd.h>
#include <linux/mtd/pmc551.h>
#include <linux/mtd/compatmac.h>
static struct mtd_info *pmc551list;
static int pmc551_erase (struct mtd_info *mtd, struct erase_info *instr)
{
struct mypriv *priv = mtd->priv;
u32 soff_hi, soff_lo; /* start address offset hi/lo */
u32 eoff_hi, eoff_lo; /* end address offset hi/lo */
unsigned long end;
u_char *ptr;
size_t retlen;
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_erase(pos:%ld, len:%ld)\n", (long)instr->addr, (long)instr->len);
#endif
end = instr->addr + instr->len - 1;
/* Is it past the end? */
if ( end > mtd->size ) {
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_erase() out of bounds (%ld > %ld)\n", (long)end, (long)mtd->size);
#endif
return -EINVAL;
}
eoff_hi = end & ~(priv->asize - 1);
soff_hi = instr->addr & ~(priv->asize - 1);
eoff_lo = end & (priv->asize - 1);
soff_lo = instr->addr & (priv->asize - 1);
pmc551_point (mtd, instr->addr, instr->len, &retlen, &ptr);
if ( soff_hi == eoff_hi || mtd->size == priv->asize) {
/* The whole thing fits within one access, so just one shot
will do it. */
memset(ptr, 0xff, instr->len);
} else {
/* We have to do multiple writes to get all the data
written. */
while (soff_hi != eoff_hi) {
#ifdef CONFIG_MTD_PMC551_DEBUG
printk( KERN_DEBUG "pmc551_erase() soff_hi: %ld, eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
#endif
memset(ptr, 0xff, priv->asize);
if (soff_hi + priv->asize >= mtd->size) {
goto out;
}
soff_hi += priv->asize;
pmc551_point (mtd,(priv->base_map0|soff_hi),
priv->asize, &retlen, &ptr);
}
memset (ptr, 0xff, eoff_lo);
}
out:
instr->state = MTD_ERASE_DONE;
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_erase() done\n");
#endif
mtd_erase_callback(instr);
return 0;
}
static int pmc551_point (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf)
{
struct mypriv *priv = mtd->priv;
u32 soff_hi;
u32 soff_lo;
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_point(%ld, %ld)\n", (long)from, (long)len);
#endif
if (from + len > mtd->size) {
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_point() out of bounds (%ld > %ld)\n", (long)from+len, (long)mtd->size);
#endif
return -EINVAL;
}
soff_hi = from & ~(priv->asize - 1);
soff_lo = from & (priv->asize - 1);
/* Cheap hack optimization */
if( priv->curr_map0 != from ) {
pci_write_config_dword ( priv->dev, PMC551_PCI_MEM_MAP0,
(priv->base_map0 | soff_hi) );
priv->curr_map0 = soff_hi;
}
*mtdbuf = priv->start + soff_lo;
*retlen = len;
return 0;
}
static void pmc551_unpoint (struct mtd_info *mtd, u_char *addr, loff_t from, size_t len)
{
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_unpoint()\n");
#endif
}
static int pmc551_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
struct mypriv *priv = mtd->priv;
u32 soff_hi, soff_lo; /* start address offset hi/lo */
u32 eoff_hi, eoff_lo; /* end address offset hi/lo */
unsigned long end;
u_char *ptr;
u_char *copyto = buf;
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_read(pos:%ld, len:%ld) asize: %ld\n", (long)from, (long)len, (long)priv->asize);
#endif
end = from + len - 1;
/* Is it past the end? */
if (end > mtd->size) {
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_read() out of bounds (%ld > %ld)\n", (long) end, (long)mtd->size);
#endif
return -EINVAL;
}
soff_hi = from & ~(priv->asize - 1);
eoff_hi = end & ~(priv->asize - 1);
soff_lo = from & (priv->asize - 1);
eoff_lo = end & (priv->asize - 1);
pmc551_point (mtd, from, len, retlen, &ptr);
if (soff_hi == eoff_hi) {
/* The whole thing fits within one access, so just one shot
will do it. */
memcpy(copyto, ptr, len);
copyto += len;
} else {
/* We have to do multiple writes to get all the data
written. */
while (soff_hi != eoff_hi) {
#ifdef CONFIG_MTD_PMC551_DEBUG
printk( KERN_DEBUG "pmc551_read() soff_hi: %ld, eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
#endif
memcpy(copyto, ptr, priv->asize);
copyto += priv->asize;
if (soff_hi + priv->asize >= mtd->size) {
goto out;
}
soff_hi += priv->asize;
pmc551_point (mtd, soff_hi, priv->asize, retlen, &ptr);
}
memcpy(copyto, ptr, eoff_lo);
copyto += eoff_lo;
}
out:
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_read() done\n");
#endif
*retlen = copyto - buf;
return 0;
}
static int pmc551_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
struct mypriv *priv = mtd->priv;
u32 soff_hi, soff_lo; /* start address offset hi/lo */
u32 eoff_hi, eoff_lo; /* end address offset hi/lo */
unsigned long end;
u_char *ptr;
const u_char *copyfrom = buf;
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_write(pos:%ld, len:%ld) asize:%ld\n", (long)to, (long)len, (long)priv->asize);
#endif
end = to + len - 1;
/* Is it past the end? or did the u32 wrap? */
if (end > mtd->size ) {
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_write() out of bounds (end: %ld, size: %ld, to: %ld)\n", (long) end, (long)mtd->size, (long)to);
#endif
return -EINVAL;
}
soff_hi = to & ~(priv->asize - 1);
eoff_hi = end & ~(priv->asize - 1);
soff_lo = to & (priv->asize - 1);
eoff_lo = end & (priv->asize - 1);
pmc551_point (mtd, to, len, retlen, &ptr);
if (soff_hi == eoff_hi) {
/* The whole thing fits within one access, so just one shot
will do it. */
memcpy(ptr, copyfrom, len);
copyfrom += len;
} else {
/* We have to do multiple writes to get all the data
written. */
while (soff_hi != eoff_hi) {
#ifdef CONFIG_MTD_PMC551_DEBUG
printk( KERN_DEBUG "pmc551_write() soff_hi: %ld, eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
#endif
memcpy(ptr, copyfrom, priv->asize);
copyfrom += priv->asize;
if (soff_hi >= mtd->size) {
goto out;
}
soff_hi += priv->asize;
pmc551_point (mtd, soff_hi, priv->asize, retlen, &ptr);
}
memcpy(ptr, copyfrom, eoff_lo);
copyfrom += eoff_lo;
}
out:
#ifdef CONFIG_MTD_PMC551_DEBUG
printk(KERN_DEBUG "pmc551_write() done\n");
#endif
*retlen = copyfrom - buf;
return 0;
}
/*
* Fixup routines for the V370PDC
* PCI device ID 0x020011b0
*
* This function basicly kick starts the DRAM oboard the card and gets it
* ready to be used. Before this is done the device reads VERY erratic, so
* much that it can crash the Linux 2.2.x series kernels when a user cat's
* /proc/pci .. though that is mainly a kernel bug in handling the PCI DEVSEL
* register. FIXME: stop spinning on registers .. must implement a timeout
* mechanism
* returns the size of the memory region found.
*/
static u32 fixup_pmc551 (struct pci_dev *dev)
{
#ifdef CONFIG_MTD_PMC551_BUGFIX
u32 dram_data;
#endif
u32 size, dcmd, cfg, dtmp;
u16 cmd, tmp, i;
u8 bcmd, counter;
/* Sanity Check */
if(!dev) {
return -ENODEV;
}
/*
* Attempt to reset the card
* FIXME: Stop Spinning registers
*/
counter=0;
/* unlock registers */
pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, 0xA5 );
/* read in old data */
pci_read_config_byte(dev, PMC551_SYS_CTRL_REG, &bcmd );
/* bang the reset line up and down for a few */
for(i=0;i<10;i++) {
counter=0;
bcmd &= ~0x80;
while(counter++ < 100) {
pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);
}
counter=0;
bcmd |= 0x80;
while(counter++ < 100) {
pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);
}
}
bcmd |= (0x40|0x20);
pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);
/*
* Take care and turn off the memory on the device while we
* tweak the configurations
*/
pci_read_config_word(dev, PCI_COMMAND, &cmd);
tmp = cmd & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY);
pci_write_config_word(dev, PCI_COMMAND, tmp);
/*
* Disable existing aperture before probing memory size
*/
pci_read_config_dword(dev, PMC551_PCI_MEM_MAP0, &dcmd);
dtmp=(dcmd|PMC551_PCI_MEM_MAP_ENABLE|PMC551_PCI_MEM_MAP_REG_EN);
pci_write_config_dword(dev, PMC551_PCI_MEM_MAP0, dtmp);
/*
* Grab old BAR0 config so that we can figure out memory size
* This is another bit of kludge going on. The reason for the
* redundancy is I am hoping to retain the original configuration
* previously assigned to the card by the BIOS or some previous
* fixup routine in the kernel. So we read the old config into cfg,
* then write all 1's to the memory space, read back the result into
* "size", and then write back all the old config.
*/
pci_read_config_dword( dev, PCI_BASE_ADDRESS_0, &cfg );
#ifndef CONFIG_MTD_PMC551_BUGFIX
pci_write_config_dword( dev, PCI_BASE_ADDRESS_0, ~0 );
pci_read_config_dword( dev, PCI_BASE_ADDRESS_0, &size );
size = (size&PCI_BASE_ADDRESS_MEM_MASK);
size &= ~(size-1);
pci_write_config_dword( dev, PCI_BASE_ADDRESS_0, cfg );
#else
/*
* Get the size of the memory by reading all the DRAM size values
* and adding them up.
*
* KLUDGE ALERT: the boards we are using have invalid column and
* row mux values. We fix them here, but this will break other
* memory configurations.
*/
pci_read_config_dword(dev, PMC551_DRAM_BLK0, &dram_data);
size = PMC551_DRAM_BLK_GET_SIZE(dram_data);
dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
pci_write_config_dword(dev, PMC551_DRAM_BLK0, dram_data);
pci_read_config_dword(dev, PMC551_DRAM_BLK1, &dram_data);
size += PMC551_DRAM_BLK_GET_SIZE(dram_data);
dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
pci_write_config_dword(dev, PMC551_DRAM_BLK1, dram_data);
pci_read_config_dword(dev, PMC551_DRAM_BLK2, &dram_data);
size += PMC551_DRAM_BLK_GET_SIZE(dram_data);
dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
pci_write_config_dword(dev, PMC551_DRAM_BLK2, dram_data);
pci_read_config_dword(dev, PMC551_DRAM_BLK3, &dram_data);
size += PMC551_DRAM_BLK_GET_SIZE(dram_data);
dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
pci_write_config_dword(dev, PMC551_DRAM_BLK3, dram_data);
/*
* Oops .. something went wrong
*/
if( (size &= PCI_BASE_ADDRESS_MEM_MASK) == 0) {
return -ENODEV;
}
#endif /* CONFIG_MTD_PMC551_BUGFIX */
if ((cfg&PCI_BASE_ADDRESS_SPACE) != PCI_BASE_ADDRESS_SPACE_MEMORY) {
return -ENODEV;
}
/*
* Precharge Dram
*/
pci_write_config_word( dev, PMC551_SDRAM_MA, 0x0400 );
pci_write_config_word( dev, PMC551_SDRAM_CMD, 0x00bf );
/*
* Wait until command has gone through
* FIXME: register spinning issue
*/
do { pci_read_config_word( dev, PMC551_SDRAM_CMD, &cmd );
if(counter++ > 100)break;
} while ( (PCI_COMMAND_IO) & cmd );
/*
* Turn on auto refresh
* The loop is taken directly from Ramix's example code. I assume that
* this must be held high for some duration of time, but I can find no
* documentation refrencing the reasons why.
*/
for ( i = 1; i<=8 ; i++) {
pci_write_config_word (dev, PMC551_SDRAM_CMD, 0x0df);
/*
* Make certain command has gone through
* FIXME: register spinning issue
*/
counter=0;
do { pci_read_config_word(dev, PMC551_SDRAM_CMD, &cmd);
if(counter++ > 100)break;
} while ( (PCI_COMMAND_IO) & cmd );
}
pci_write_config_word ( dev, PMC551_SDRAM_MA, 0x0020);
pci_write_config_word ( dev, PMC551_SDRAM_CMD, 0x0ff);
/*
* Wait until command completes
* FIXME: register spinning issue
*/
counter=0;
do { pci_read_config_word ( dev, PMC551_SDRAM_CMD, &cmd);
if(counter++ > 100)break;
} while ( (PCI_COMMAND_IO) & cmd );
pci_read_config_dword ( dev, PMC551_DRAM_CFG, &dcmd);
dcmd |= 0x02000000;
pci_write_config_dword ( dev, PMC551_DRAM_CFG, dcmd);
/*
* Check to make certain fast back-to-back, if not
* then set it so
*/
pci_read_config_word( dev, PCI_STATUS, &cmd);
if((cmd&PCI_COMMAND_FAST_BACK) == 0) {
cmd |= PCI_COMMAND_FAST_BACK;
pci_write_config_word( dev, PCI_STATUS, cmd);
}
/*
* Check to make certain the DEVSEL is set correctly, this device
* has a tendancy to assert DEVSEL and TRDY when a write is performed
* to the memory when memory is read-only
*/
if((cmd&PCI_STATUS_DEVSEL_MASK) != 0x0) {
cmd &= ~PCI_STATUS_DEVSEL_MASK;
pci_write_config_word( dev, PCI_STATUS, cmd );
}
/*
* Set to be prefetchable and put everything back based on old cfg.
* it's possible that the reset of the V370PDC nuked the original
* setup
*/
/*
cfg |= PCI_BASE_ADDRESS_MEM_PREFETCH;
pci_write_config_dword( dev, PCI_BASE_ADDRESS_0, cfg );
*/
/*
* Turn PCI memory and I/O bus access back on
*/
pci_write_config_word( dev, PCI_COMMAND,
PCI_COMMAND_MEMORY | PCI_COMMAND_IO );
#ifdef CONFIG_MTD_PMC551_DEBUG
/*
* Some screen fun
*/
printk(KERN_DEBUG "pmc551: %d%c (0x%x) of %sprefetchable memory at 0x%lx\n",
(size<1024)?size:(size<1048576)?size>>10:size>>20,
(size<1024)?'B':(size<1048576)?'K':'M',
size, ((dcmd&(0x1<<3)) == 0)?"non-":"",
(dev->resource[0].start)&PCI_BASE_ADDRESS_MEM_MASK );
/*
* Check to see the state of the memory
*/
pci_read_config_dword( dev, PMC551_DRAM_BLK0, &dcmd );
printk(KERN_DEBUG "pmc551: DRAM_BLK0 Flags: %s,%s\n"
"pmc551: DRAM_BLK0 Size: %d at %d\n"
"pmc551: DRAM_BLK0 Row MUX: %d, Col MUX: %d\n",
(((0x1<<1)&dcmd) == 0)?"RW":"RO",
(((0x1<<0)&dcmd) == 0)?"Off":"On",
PMC551_DRAM_BLK_GET_SIZE(dcmd),
((dcmd>>20)&0x7FF), ((dcmd>>13)&0x7), ((dcmd>>9)&0xF) );
pci_read_config_dword( dev, PMC551_DRAM_BLK1, &dcmd );
printk(KERN_DEBUG "pmc551: DRAM_BLK1 Flags: %s,%s\n"
"pmc551: DRAM_BLK1 Size: %d at %d\n"
"pmc551: DRAM_BLK1 Row MUX: %d, Col MUX: %d\n",
(((0x1<<1)&dcmd) == 0)?"RW":"RO",
(((0x1<<0)&dcmd) == 0)?"Off":"On",
PMC551_DRAM_BLK_GET_SIZE(dcmd),
((dcmd>>20)&0x7FF), ((dcmd>>13)&0x7), ((dcmd>>9)&0xF) );
pci_read_config_dword( dev, PMC551_DRAM_BLK2, &dcmd );
printk(KERN_DEBUG "pmc551: DRAM_BLK2 Flags: %s,%s\n"
"pmc551: DRAM_BLK2 Size: %d at %d\n"
"pmc551: DRAM_BLK2 Row MUX: %d, Col MUX: %d\n",
(((0x1<<1)&dcmd) == 0)?"RW":"RO",
(((0x1<<0)&dcmd) == 0)?"Off":"On",
PMC551_DRAM_BLK_GET_SIZE(dcmd),
((dcmd>>20)&0x7FF), ((dcmd>>13)&0x7), ((dcmd>>9)&0xF) );
pci_read_config_dword( dev, PMC551_DRAM_BLK3, &dcmd );
printk(KERN_DEBUG "pmc551: DRAM_BLK3 Flags: %s,%s\n"
"pmc551: DRAM_BLK3 Size: %d at %d\n"
"pmc551: DRAM_BLK3 Row MUX: %d, Col MUX: %d\n",
(((0x1<<1)&dcmd) == 0)?"RW":"RO",
(((0x1<<0)&dcmd) == 0)?"Off":"On",
PMC551_DRAM_BLK_GET_SIZE(dcmd),
((dcmd>>20)&0x7FF), ((dcmd>>13)&0x7), ((dcmd>>9)&0xF) );
pci_read_config_word( dev, PCI_COMMAND, &cmd );
printk( KERN_DEBUG "pmc551: Memory Access %s\n",
(((0x1<<1)&cmd) == 0)?"off":"on" );
printk( KERN_DEBUG "pmc551: I/O Access %s\n",
(((0x1<<0)&cmd) == 0)?"off":"on" );
pci_read_config_word( dev, PCI_STATUS, &cmd );
printk( KERN_DEBUG "pmc551: Devsel %s\n",
((PCI_STATUS_DEVSEL_MASK&cmd)==0x000)?"Fast":
((PCI_STATUS_DEVSEL_MASK&cmd)==0x200)?"Medium":
((PCI_STATUS_DEVSEL_MASK&cmd)==0x400)?"Slow":"Invalid" );
printk( KERN_DEBUG "pmc551: %sFast Back-to-Back\n",
((PCI_COMMAND_FAST_BACK&cmd) == 0)?"Not ":"" );
pci_read_config_byte(dev, PMC551_SYS_CTRL_REG, &bcmd );
printk( KERN_DEBUG "pmc551: EEPROM is under %s control\n"
"pmc551: System Control Register is %slocked to PCI access\n"
"pmc551: System Control Register is %slocked to EEPROM access\n",
(bcmd&0x1)?"software":"hardware",
(bcmd&0x20)?"":"un", (bcmd&0x40)?"":"un");
#endif
return size;
}
/*
* Kernel version specific module stuffages
*/
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Ferrell <mferrell@mvista.com>");
MODULE_DESCRIPTION(PMC551_VERSION);
/*
* Stuff these outside the ifdef so as to not bust compiled in driver support
*/
static int msize=0;
#if defined(CONFIG_MTD_PMC551_APERTURE_SIZE)
static int asize=CONFIG_MTD_PMC551_APERTURE_SIZE
#else
static int asize=0;
#endif
module_param(msize, int, 0);
MODULE_PARM_DESC(msize, "memory size in Megabytes [1 - 1024]");
module_param(asize, int, 0);
MODULE_PARM_DESC(asize, "aperture size, must be <= memsize [1-1024]");
/*
* PMC551 Card Initialization
*/
static int __init init_pmc551(void)
{
struct pci_dev *PCI_Device = NULL;
struct mypriv *priv;
int count, found=0;
struct mtd_info *mtd;
u32 length = 0;
if(msize) {
msize = (1 << (ffs(msize) - 1))<<20;
if (msize > (1<<30)) {
printk(KERN_NOTICE "pmc551: Invalid memory size [%d]\n", msize);
return -EINVAL;
}
}
if(asize) {
asize = (1 << (ffs(asize) - 1))<<20;
if (asize > (1<<30) ) {
printk(KERN_NOTICE "pmc551: Invalid aperture size [%d]\n", asize);
return -EINVAL;
}
}
printk(KERN_INFO PMC551_VERSION);
/*
* PCU-bus chipset probe.
*/
for( count = 0; count < MAX_MTD_DEVICES; count++ ) {
if ((PCI_Device = pci_find_device(PCI_VENDOR_ID_V3_SEMI,
PCI_DEVICE_ID_V3_SEMI_V370PDC,
PCI_Device ) ) == NULL) {
break;
}
printk(KERN_NOTICE "pmc551: Found PCI V370PDC at 0x%lX\n",
PCI_Device->resource[0].start);
/*
* The PMC551 device acts VERY weird if you don't init it
* first. i.e. it will not correctly report devsel. If for
* some reason the sdram is in a wrote-protected state the
* device will DEVSEL when it is written to causing problems
* with the oldproc.c driver in
* some kernels (2.2.*)
*/
if((length = fixup_pmc551(PCI_Device)) <= 0) {
printk(KERN_NOTICE "pmc551: Cannot init SDRAM\n");
break;
}
/*
* This is needed until the driver is capable of reading the
* onboard I2C SROM to discover the "real" memory size.
*/
if(msize) {
length = msize;
printk(KERN_NOTICE "pmc551: Using specified memory size 0x%x\n", length);
} else {
msize = length;
}
mtd = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
if (!mtd) {
printk(KERN_NOTICE "pmc551: Cannot allocate new MTD device.\n");
break;
}
memset(mtd, 0, sizeof(struct mtd_info));
priv = kmalloc (sizeof(struct mypriv), GFP_KERNEL);
if (!priv) {
printk(KERN_NOTICE "pmc551: Cannot allocate new MTD device.\n");
kfree(mtd);
break;
}
memset(priv, 0, sizeof(*priv));
mtd->priv = priv;
priv->dev = PCI_Device;
if(asize > length) {
printk(KERN_NOTICE "pmc551: reducing aperture size to fit %dM\n",length>>20);
priv->asize = asize = length;
} else if (asize == 0 || asize == length) {
printk(KERN_NOTICE "pmc551: Using existing aperture size %dM\n", length>>20);
priv->asize = asize = length;
} else {
printk(KERN_NOTICE "pmc551: Using specified aperture size %dM\n", asize>>20);
priv->asize = asize;
}
priv->start = ioremap(((PCI_Device->resource[0].start)
& PCI_BASE_ADDRESS_MEM_MASK),
priv->asize);
if (!priv->start) {
printk(KERN_NOTICE "pmc551: Unable to map IO space\n");
kfree(mtd->priv);
kfree(mtd);
break;
}
#ifdef CONFIG_MTD_PMC551_DEBUG
printk( KERN_DEBUG "pmc551: setting aperture to %d\n",
ffs(priv->asize>>20)-1);
#endif
priv->base_map0 = ( PMC551_PCI_MEM_MAP_REG_EN
| PMC551_PCI_MEM_MAP_ENABLE
| (ffs(priv->asize>>20)-1)<<4 );
priv->curr_map0 = priv->base_map0;
pci_write_config_dword ( priv->dev, PMC551_PCI_MEM_MAP0,
priv->curr_map0 );
#ifdef CONFIG_MTD_PMC551_DEBUG
printk( KERN_DEBUG "pmc551: aperture set to %d\n",
(priv->base_map0 & 0xF0)>>4 );
#endif
mtd->size = msize;
mtd->flags = MTD_CAP_RAM;
mtd->erase = pmc551_erase;
mtd->read = pmc551_read;
mtd->write = pmc551_write;
mtd->point = pmc551_point;
mtd->unpoint = pmc551_unpoint;
mtd->type = MTD_RAM;
mtd->name = "PMC551 RAM board";
mtd->erasesize = 0x10000;
mtd->owner = THIS_MODULE;
if (add_mtd_device(mtd)) {
printk(KERN_NOTICE "pmc551: Failed to register new device\n");
iounmap(priv->start);
kfree(mtd->priv);
kfree(mtd);
break;
}
printk(KERN_NOTICE "Registered pmc551 memory device.\n");
printk(KERN_NOTICE "Mapped %dM of memory from 0x%p to 0x%p\n",
priv->asize>>20,
priv->start,
priv->start + priv->asize);
printk(KERN_NOTICE "Total memory is %d%c\n",
(length<1024)?length:
(length<1048576)?length>>10:length>>20,
(length<1024)?'B':(length<1048576)?'K':'M');
priv->nextpmc551 = pmc551list;
pmc551list = mtd;
found++;
}
if( !pmc551list ) {
printk(KERN_NOTICE "pmc551: not detected\n");
return -ENODEV;
} else {
printk(KERN_NOTICE "pmc551: %d pmc551 devices loaded\n", found);
return 0;
}
}
/*
* PMC551 Card Cleanup
*/
static void __exit cleanup_pmc551(void)
{
int found=0;
struct mtd_info *mtd;
struct mypriv *priv;
while((mtd=pmc551list)) {
priv = mtd->priv;
pmc551list = priv->nextpmc551;
if(priv->start) {
printk (KERN_DEBUG "pmc551: unmapping %dM starting at 0x%p\n",
priv->asize>>20, priv->start);
iounmap (priv->start);
}
kfree (mtd->priv);
del_mtd_device (mtd);
kfree (mtd);
found++;
}
printk(KERN_NOTICE "pmc551: %d pmc551 devices unloaded\n", found);
}
module_init(init_pmc551);
module_exit(cleanup_pmc551);
Reference in New Issue View Git Blame Copy Permalink