pmc551.c

老版本的mtd-snap

#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 <[e-mail]>");
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);