--- /dev/null
+/*
+ * 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/init.h>
+#include <linux/pci.h>
+#include <linux/ide.h>
+#include <linux/dma-mapping.h>
+
+#define DRV_NAME "cs5520"
+
+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_hwif_t *hwif, ide_drive_t *drive)
+{
+ struct pci_dev *pdev = to_pci_dev(hwif->dev);
+ int controller = drive->dn > 1 ? 1 : 0;
+ const u8 pio = drive->pio_mode - XFER_PIO_0;
+
+ /* 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_hwif_t *hwif, ide_drive_t *drive)
+{
+ printk(KERN_ERR "cs55x0: bad ide timing.\n");
+
+ drive->pio_mode = XFER_PIO_0 + 0;
+ cs5520_set_pio_mode(hwif, drive);
+}
+
+static const struct ide_port_ops cs5520_port_ops = {
+ .set_pio_mode = cs5520_set_pio_mode,
+ .set_dma_mode = cs5520_set_dma_mode,
+};
+
+static const struct ide_port_info cyrix_chipset = {
+ .name = DRV_NAME,
+ .enablebits = { { 0x60, 0x01, 0x01 }, { 0x60, 0x02, 0x02 } },
+ .port_ops = &cs5520_port_ops,
+ .host_flags = IDE_HFLAG_ISA_PORTS | IDE_HFLAG_CS5520,
+ .pio_mask = ATA_PIO4,
+};
+
+/*
+ * 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 cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ const struct ide_port_info *d = &cyrix_chipset;
+ struct ide_hw hw[2], *hws[] = { NULL, NULL };
+
+ 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_io(dev)) {
+ printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
+ return -ENODEV;
+ }
+ pci_set_master(dev);
+ if (dma_set_mask(&dev->dev, DMA_BIT_MASK(32))) {
+ printk(KERN_WARNING "%s: No suitable DMA available.\n",
+ d->name);
+ 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, &hw[0], &hws[0]);
+ hw[0].irq = 14;
+ hw[1].irq = 15;
+
+ return ide_host_add(d, hws, 2, NULL);
+}
+
+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 cs5520_pci_driver = {
+ .name = "Cyrix_IDE",
+ .id_table = cs5520_pci_tbl,
+ .probe = cs5520_init_one,
+ .suspend = ide_pci_suspend,
+ .resume = ide_pci_resume,
+};
+
+static int __init cs5520_ide_init(void)
+{
+ return ide_pci_register_driver(&cs5520_pci_driver);
+}
+
+module_init(cs5520_ide_init);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff