| /* |
| * 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 = to_pci_dev(hwif->dev); |
| int controller = drive->dn > 1 ? 1 : 0; |
| |
| /* 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)); |
| } |
| |
| 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 |
| * |
| * ATAPI is harder so disable it for now using IDE_HFLAG_NO_ATAPI_DMA |
| */ |
| |
| static void cs5520_dma_host_set(ide_drive_t *drive, int on) |
| { |
| drive->vdma = on; |
| ide_dma_host_set(drive, on); |
| } |
| |
| 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->dma_host_set = &cs5520_dma_host_set; |
| } |
| |
| #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_ABUSE_SET_DMA_MODE |\ |
| 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"); |