/* * IDE tuning and bus mastering support for the CS5510/CS5520 * chipsets * * The CS5510/CS5520 are slightly unusual devices. Unlike the * typical IDE controllers they do bus mastering with the drive in * PIO mode and smarter silicon. * * The practical upshot of this is that we must always tune the * drive for the right PIO mode. We must also ignore all the blacklists * and the drive bus mastering DMA information. * * *** This driver is strictly experimental *** * * (c) Copyright Red Hat Inc 2002 * * 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, or (at your option) any * later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * For the avoidance of doubt the "preferred form" of this code is one which * is in an open non patent encumbered format. Where cryptographic key signing * forms part of the process of creating an executable the information * including keys needed to generate an equivalently functional executable * are deemed to be part of the source code. * */ #include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/timer.h> #include <linux/mm.h> #include <linux/ioport.h> #include <linux/blkdev.h> #include <linux/hdreg.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/pci.h> #include <linux/ide.h> #include <linux/dma-mapping.h> #include <asm/io.h> #include <asm/irq.h> struct pio_clocks { int address; int assert; int recovery; }; static struct pio_clocks cs5520_pio_clocks[]={ {3, 6, 11}, {2, 5, 6}, {1, 4, 3}, {1, 3, 2}, {1, 2, 1} }; static void cs5520_set_pio_mode(ide_drive_t *drive, const u8 pio) { ide_hwif_t *hwif = HWIF(drive); struct pci_dev *pdev = hwif->pci_dev; int controller = drive->dn > 1 ? 1 : 0; u8 reg; /* FIXME: if DMA = 1 do we need to set the DMA bit here ? */ /* 8bit CAT/CRT - 8bit command timing for channel */ pci_write_config_byte(pdev, 0x62 + controller, (cs5520_pio_clocks[pio].recovery << 4) | (cs5520_pio_clocks[pio].assert)); /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */ /* FIXME: should these use address ? */ /* Data read timing */ pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1), (cs5520_pio_clocks[pio].recovery << 4) | (cs5520_pio_clocks[pio].assert)); /* Write command timing */ pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1), (cs5520_pio_clocks[pio].recovery << 4) | (cs5520_pio_clocks[pio].assert)); /* Set the DMA enable/disable flag */ reg = inb(hwif->dma_base + 0x02 + 8*controller); reg |= 1<<((drive->dn&1)+5); outb(reg, hwif->dma_base + 0x02 + 8*controller); } static void cs5520_set_dma_mode(ide_drive_t *drive, const u8 speed) { printk(KERN_ERR "cs55x0: bad ide timing.\n"); cs5520_set_pio_mode(drive, 0); } /* * We wrap the DMA activate to set the vdma flag. This is needed * so that the IDE DMA layer issues PIO not DMA commands over the * DMA channel */ static int cs5520_dma_on(ide_drive_t *drive) { /* ATAPI is harder so leave it for now */ drive->vdma = 1; return 0; } static void __devinit init_hwif_cs5520(ide_hwif_t *hwif) { hwif->set_pio_mode = &cs5520_set_pio_mode; hwif->set_dma_mode = &cs5520_set_dma_mode; if (hwif->dma_base == 0) return; hwif->ide_dma_on = &cs5520_dma_on; } #define DECLARE_CS_DEV(name_str) \ { \ .name = name_str, \ .init_hwif = init_hwif_cs5520, \ .host_flags = IDE_HFLAG_ISA_PORTS | \ IDE_HFLAG_CS5520 | \ IDE_HFLAG_VDMA | \ IDE_HFLAG_NO_ATAPI_DMA | \ IDE_HFLAG_BOOTABLE, \ .pio_mask = ATA_PIO4, \ } static const struct ide_port_info cyrix_chipsets[] __devinitdata = { /* 0 */ DECLARE_CS_DEV("Cyrix 5510"), /* 1 */ DECLARE_CS_DEV("Cyrix 5520") }; /* * The 5510/5520 are a bit weird. They don't quite set up the way * the PCI helper layer expects so we must do much of the set up * work longhand. */ static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id) { const struct ide_port_info *d = &cyrix_chipsets[id->driver_data]; u8 idx[4] = { 0xff, 0xff, 0xff, 0xff }; ide_setup_pci_noise(dev, d); /* We must not grab the entire device, it has 'ISA' space in its BARS too and we will freak out other bits of the kernel */ if (pci_enable_device_bars(dev, 1<<2)) { printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name); return -ENODEV; } pci_set_master(dev); if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) { printk(KERN_WARNING "cs5520: No suitable DMA available.\n"); return -ENODEV; } /* * Now the chipset is configured we can let the core * do all the device setup for us */ ide_pci_setup_ports(dev, d, 14, &idx[0]); ide_device_add(idx); return 0; } static const struct pci_device_id cs5520_pci_tbl[] = { { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), 0 }, { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), 1 }, { 0, }, }; MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl); static struct pci_driver driver = { .name = "Cyrix_IDE", .id_table = cs5520_pci_tbl, .probe = cs5520_init_one, }; static int __init cs5520_ide_init(void) { return ide_pci_register_driver(&driver); } module_init(cs5520_ide_init); MODULE_AUTHOR("Alan Cox"); MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE"); MODULE_LICENSE("GPL");