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Diffstat (limited to 'drivers/mtd/devices/pmc551.c')
| -rw-r--r-- | drivers/mtd/devices/pmc551.c | 847 |
1 files changed, 847 insertions, 0 deletions
diff --git a/drivers/mtd/devices/pmc551.c b/drivers/mtd/devices/pmc551.c new file mode 100644 index 000000000..6597fc2aa --- /dev/null +++ b/drivers/mtd/devices/pmc551.c @@ -0,0 +1,847 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PMC551 PCI Mezzanine Ram Device + * + * Author: + * Mark Ferrell <mferrell@mvista.com> + * Copyright 1999,2000 Nortel Networks + * + * 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 its DRAM banks have 64MiB + * of ram configured (making a grand total of 256MiB 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 than + * 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/FIXMEs: + * * 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/kernel.h> +#include <linux/module.h> +#include <linux/uaccess.h> +#include <linux/types.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 <linux/pci.h> +#include <linux/mtd/mtd.h> + +#define PMC551_VERSION \ + "Ramix PMC551 PCI Mezzanine Ram Driver. (C) 1999,2000 Nortel Networks.\n" + +#define PCI_VENDOR_ID_V3_SEMI 0x11b0 +#define PCI_DEVICE_ID_V3_SEMI_V370PDC 0x0200 + +#define PMC551_PCI_MEM_MAP0 0x50 +#define PMC551_PCI_MEM_MAP1 0x54 +#define PMC551_PCI_MEM_MAP_MAP_ADDR_MASK 0x3ff00000 +#define PMC551_PCI_MEM_MAP_APERTURE_MASK 0x000000f0 +#define PMC551_PCI_MEM_MAP_REG_EN 0x00000002 +#define PMC551_PCI_MEM_MAP_ENABLE 0x00000001 + +#define PMC551_SDRAM_MA 0x60 +#define PMC551_SDRAM_CMD 0x62 +#define PMC551_DRAM_CFG 0x64 +#define PMC551_SYS_CTRL_REG 0x78 + +#define PMC551_DRAM_BLK0 0x68 +#define PMC551_DRAM_BLK1 0x6c +#define PMC551_DRAM_BLK2 0x70 +#define PMC551_DRAM_BLK3 0x74 +#define PMC551_DRAM_BLK_GET_SIZE(x) (524288 << ((x >> 4) & 0x0f)) +#define PMC551_DRAM_BLK_SET_COL_MUX(x, v) (((x) & ~0x00007000) | (((v) & 0x7) << 12)) +#define PMC551_DRAM_BLK_SET_ROW_MUX(x, v) (((x) & ~0x00000f00) | (((v) & 0xf) << 8)) + +struct mypriv { + struct pci_dev *dev; + u_char *start; + u32 base_map0; + u32 curr_map0; + u32 asize; + struct mtd_info *nextpmc551; +}; + +static struct mtd_info *pmc551list; + +static int pmc551_point(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, void **virt, resource_size_t *phys); + +static int pmc551_erase(struct mtd_info *mtd, struct erase_info *instr) +{ + struct mypriv *priv = mtd->priv; + u32 soff_hi; /* start address offset hi */ + 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; + eoff_hi = end & ~(priv->asize - 1); + soff_hi = instr->addr & ~(priv->asize - 1); + eoff_lo = end & (priv->asize - 1); + + pmc551_point(mtd, instr->addr, instr->len, &retlen, + (void **)&ptr, NULL); + + 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, + (void **)&ptr, NULL); + } + memset(ptr, 0xff, eoff_lo); + } + + out: +#ifdef CONFIG_MTD_PMC551_DEBUG + printk(KERN_DEBUG "pmc551_erase() done\n"); +#endif + + return 0; +} + +static int pmc551_point(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, void **virt, resource_size_t *phys) +{ + 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 + + 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; + } + + *virt = priv->start + soff_lo; + *retlen = len; + return 0; +} + +static int pmc551_unpoint(struct mtd_info *mtd, loff_t from, size_t len) +{ +#ifdef CONFIG_MTD_PMC551_DEBUG + printk(KERN_DEBUG "pmc551_unpoint()\n"); +#endif + return 0; +} + +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; /* start address offset hi */ + 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; + soff_hi = from & ~(priv->asize - 1); + eoff_hi = end & ~(priv->asize - 1); + eoff_lo = end & (priv->asize - 1); + + pmc551_point(mtd, from, len, retlen, (void **)&ptr, NULL); + + 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, + (void **)&ptr, NULL); + } + 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; /* start address offset hi */ + 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; + soff_hi = to & ~(priv->asize - 1); + eoff_hi = end & ~(priv->asize - 1); + eoff_lo = end & (priv->asize - 1); + + pmc551_point(mtd, to, len, retlen, (void **)&ptr, NULL); + + 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, + (void **)&ptr, NULL); + } + 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 basically 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 int __init 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 tendency 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%sB (0x%x) of %sprefetchable memory at " + "0x%llx\n", (size < 1024) ? size : (size < 1048576) ? + size >> 10 : size >> 20, + (size < 1024) ? "" : (size < 1048576) ? "Ki" : "Mi", size, + ((dcmd & (0x1 << 3)) == 0) ? "non-" : "", + (unsigned long long)pci_resource_start(dev, 0)); + + /* + * 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; +static int asize = 0; + +module_param(msize, int, 0); +MODULE_PARM_DESC(msize, "memory size in MiB [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 found = 0; + struct mtd_info *mtd; + int 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 (;;) { + + if ((PCI_Device = pci_get_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%llx\n", + (unsigned long long)pci_resource_start(PCI_Device, 0)); + + /* + * 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 = kzalloc(sizeof(struct mtd_info), GFP_KERNEL); + if (!mtd) + break; + + priv = kzalloc(sizeof(struct mypriv), GFP_KERNEL); + if (!priv) { + kfree(mtd); + break; + } + 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 = pci_iomap(PCI_Device, 0, 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->writesize = 1; + mtd->owner = THIS_MODULE; + + if (mtd_device_register(mtd, NULL, 0)) { + printk(KERN_NOTICE "pmc551: Failed to register new device\n"); + pci_iounmap(PCI_Device, priv->start); + kfree(mtd->priv); + kfree(mtd); + break; + } + + /* Keep a reference as the mtd_device_register worked */ + pci_dev_get(PCI_Device); + + printk(KERN_NOTICE "Registered pmc551 memory device.\n"); + printk(KERN_NOTICE "Mapped %dMiB 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%sB\n", + (length < 1024) ? length : + (length < 1048576) ? length >> 10 : length >> 20, + (length < 1024) ? "" : (length < 1048576) ? "Ki" : "Mi"); + priv->nextpmc551 = pmc551list; + pmc551list = mtd; + found++; + } + + /* Exited early, reference left over */ + pci_dev_put(PCI_Device); + + 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 %dMiB starting at " + "0x%p\n", priv->asize >> 20, priv->start); + pci_iounmap(priv->dev, priv->start); + } + pci_dev_put(priv->dev); + + kfree(mtd->priv); + mtd_device_unregister(mtd); + kfree(mtd); + found++; + } + + printk(KERN_NOTICE "pmc551: %d pmc551 devices unloaded\n", found); +} + +module_init(init_pmc551); +module_exit(cleanup_pmc551); |