2 * Copyright (C) 1997-1998 Mark Lord <mlord@pobox.com>
3 * Copyright (C) 1998 Eddie C. Dost <ecd@skynet.be>
4 * Copyright (C) 1999-2000 Andre Hedrick <andre@linux-ide.org>
5 * Copyright (C) 2004 Grant Grundler <grundler at parisc-linux.org>
7 * Inspired by an earlier effort from David S. Miller <davem@redhat.com>
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/interrupt.h>
14 #include <linux/hdreg.h>
15 #include <linux/pci.h>
16 #include <linux/delay.h>
17 #include <linux/ide.h>
18 #include <linux/init.h>
22 #define DRV_NAME "ns87415"
25 /* SUPERIO 87560 is a PoS chip that NatSem denies exists.
26 * Unfortunately, it's built-in on all Astro-based PA-RISC workstations
27 * which use the integrated NS87514 cell for CD-ROM support.
28 * i.e we have to support for CD-ROM installs.
29 * See drivers/parisc/superio.c for more gory details.
31 #include <asm/superio.h>
33 #define SUPERIO_IDE_MAX_RETRIES 25
35 /* Because of a defect in Super I/O, all reads of the PCI DMA status
36 * registers, IDE status register and the IDE select register need to be
39 static u8 superio_ide_inb (unsigned long port)
42 int retries = SUPERIO_IDE_MAX_RETRIES;
44 /* printk(" [ reading port 0x%x with retry ] ", port); */
50 } while (tmp == 0 && retries-- > 0);
55 static u8 superio_read_status(ide_hwif_t *hwif)
57 return superio_ide_inb(hwif->io_ports.status_addr);
60 static u8 superio_read_sff_dma_status(ide_hwif_t *hwif)
62 return superio_ide_inb(hwif->dma_base + ATA_DMA_STATUS);
65 static void superio_tf_read(ide_drive_t *drive, ide_task_t *task)
67 struct ide_io_ports *io_ports = &drive->hwif->io_ports;
68 struct ide_taskfile *tf = &task->tf;
70 if (task->tf_flags & IDE_TFLAG_IN_DATA) {
71 u16 data = inw(io_ports->data_addr);
73 tf->data = data & 0xff;
74 tf->hob_data = (data >> 8) & 0xff;
77 /* be sure we're looking at the low order bits */
78 outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
80 if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
81 tf->feature = inb(io_ports->feature_addr);
82 if (task->tf_flags & IDE_TFLAG_IN_NSECT)
83 tf->nsect = inb(io_ports->nsect_addr);
84 if (task->tf_flags & IDE_TFLAG_IN_LBAL)
85 tf->lbal = inb(io_ports->lbal_addr);
86 if (task->tf_flags & IDE_TFLAG_IN_LBAM)
87 tf->lbam = inb(io_ports->lbam_addr);
88 if (task->tf_flags & IDE_TFLAG_IN_LBAH)
89 tf->lbah = inb(io_ports->lbah_addr);
90 if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
91 tf->device = superio_ide_inb(io_ports->device_addr);
93 if (task->tf_flags & IDE_TFLAG_LBA48) {
94 outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
96 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
97 tf->hob_feature = inb(io_ports->feature_addr);
98 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
99 tf->hob_nsect = inb(io_ports->nsect_addr);
100 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
101 tf->hob_lbal = inb(io_ports->lbal_addr);
102 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
103 tf->hob_lbam = inb(io_ports->lbam_addr);
104 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
105 tf->hob_lbah = inb(io_ports->lbah_addr);
109 static const struct ide_tp_ops superio_tp_ops = {
110 .exec_command = ide_exec_command,
111 .read_status = superio_read_status,
112 .read_altstatus = ide_read_altstatus,
113 .read_sff_dma_status = superio_read_sff_dma_status,
115 .set_irq = ide_set_irq,
117 .tf_load = ide_tf_load,
118 .tf_read = superio_tf_read,
120 .input_data = ide_input_data,
121 .output_data = ide_output_data,
124 static void __devinit superio_init_iops(struct hwif_s *hwif)
126 struct pci_dev *pdev = to_pci_dev(hwif->dev);
128 u8 port = hwif->channel, tmp;
130 dma_stat = (pci_resource_start(pdev, 4) & ~3) + (!port ? 2 : 0xa);
132 /* Clear error/interrupt, enable dma */
133 tmp = superio_ide_inb(dma_stat);
134 outb(tmp | 0x66, dma_stat);
138 static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 };
141 * This routine either enables/disables (according to drive->present)
142 * the IRQ associated with the port (HWIF(drive)),
143 * and selects either PIO or DMA handshaking for the next I/O operation.
145 static void ns87415_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
147 ide_hwif_t *hwif = HWIF(drive);
148 struct pci_dev *dev = to_pci_dev(hwif->dev);
149 unsigned int bit, other, new, *old = (unsigned int *) hwif->select_data;
152 local_irq_save(flags);
155 /* Adjust IRQ enable bit */
156 bit = 1 << (8 + hwif->channel);
157 new = drive->present ? (new & ~bit) : (new | bit);
159 /* Select PIO or DMA, DMA may only be selected for one drive/channel. */
160 bit = 1 << (20 + drive->select.b.unit + (hwif->channel << 1));
161 other = 1 << (20 + (1 - drive->select.b.unit) + (hwif->channel << 1));
162 new = use_dma ? ((new & ~other) | bit) : (new & ~bit);
168 * Don't change DMA engine settings while Write Buffers
171 (void) pci_read_config_byte(dev, 0x43, &stat);
172 while (stat & 0x03) {
174 (void) pci_read_config_byte(dev, 0x43, &stat);
178 (void) pci_write_config_dword(dev, 0x40, new);
181 * And let things settle...
186 local_irq_restore(flags);
189 static void ns87415_selectproc (ide_drive_t *drive)
191 ns87415_prepare_drive (drive, drive->using_dma);
194 static int ns87415_dma_end(ide_drive_t *drive)
196 ide_hwif_t *hwif = HWIF(drive);
197 u8 dma_stat = 0, dma_cmd = 0;
199 drive->waiting_for_dma = 0;
200 dma_stat = hwif->tp_ops->read_sff_dma_status(hwif);
201 /* get DMA command mode */
202 dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
204 outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
205 /* from ERRATA: clear the INTR & ERROR bits */
206 dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
207 outb(dma_cmd | 6, hwif->dma_base + ATA_DMA_CMD);
208 /* and free any DMA resources */
209 ide_destroy_dmatable(drive);
210 /* verify good DMA status */
211 return (dma_stat & 7) != 4;
214 static int ns87415_dma_setup(ide_drive_t *drive)
216 /* select DMA xfer */
217 ns87415_prepare_drive(drive, 1);
218 if (!ide_dma_setup(drive))
220 /* DMA failed: select PIO xfer */
221 ns87415_prepare_drive(drive, 0);
225 static void __devinit init_hwif_ns87415 (ide_hwif_t *hwif)
227 struct pci_dev *dev = to_pci_dev(hwif->dev);
228 unsigned int ctrl, using_inta;
236 * We cannot probe for IRQ: both ports share common IRQ on INTA.
237 * Also, leave IRQ masked during drive probing, to prevent infinite
238 * interrupts from a potentially floating INTA..
240 * IRQs get unmasked in selectproc when drive is first used.
242 (void) pci_read_config_dword(dev, 0x40, &ctrl);
243 (void) pci_read_config_byte(dev, 0x09, &progif);
244 /* is irq in "native" mode? */
245 using_inta = progif & (1 << (hwif->channel << 1));
247 using_inta = ctrl & (1 << (4 + hwif->channel));
249 hwif->select_data = hwif->mate->select_data;
251 hwif->select_data = (unsigned long)
252 &ns87415_control[ns87415_count++];
253 ctrl |= (1 << 8) | (1 << 9); /* mask both IRQs */
255 ctrl &= ~(1 << 6); /* unmask INTA */
256 *((unsigned int *)hwif->select_data) = ctrl;
257 (void) pci_write_config_dword(dev, 0x40, ctrl);
260 * Set prefetch size to 512 bytes for both ports,
261 * but don't turn on/off prefetching here.
263 pci_write_config_byte(dev, 0x55, 0xee);
267 * XXX: Reset the device, if we don't it will not respond to
268 * SELECT_DRIVE() properly during first ide_probe_port().
271 outb(12, hwif->io_ports.ctl_addr);
273 outb(8, hwif->io_ports.ctl_addr);
276 stat = hwif->tp_ops->read_status(hwif);
279 } while ((stat & BUSY_STAT) && --timeout);
284 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
285 else if (!hwif->irq && hwif->mate && hwif->mate->irq)
286 hwif->irq = hwif->mate->irq; /* share IRQ with mate */
291 outb(0x60, hwif->dma_base + ATA_DMA_STATUS);
294 static const struct ide_port_ops ns87415_port_ops = {
295 .selectproc = ns87415_selectproc,
298 static const struct ide_dma_ops ns87415_dma_ops = {
299 .dma_host_set = ide_dma_host_set,
300 .dma_setup = ns87415_dma_setup,
301 .dma_exec_cmd = ide_dma_exec_cmd,
302 .dma_start = ide_dma_start,
303 .dma_end = ns87415_dma_end,
304 .dma_test_irq = ide_dma_test_irq,
305 .dma_lost_irq = ide_dma_lost_irq,
306 .dma_timeout = ide_dma_timeout,
309 static const struct ide_port_info ns87415_chipset __devinitdata = {
311 .init_hwif = init_hwif_ns87415,
312 .port_ops = &ns87415_port_ops,
313 .dma_ops = &ns87415_dma_ops,
314 .host_flags = IDE_HFLAG_TRUST_BIOS_FOR_DMA |
315 IDE_HFLAG_NO_ATAPI_DMA,
318 static int __devinit ns87415_init_one(struct pci_dev *dev, const struct pci_device_id *id)
320 struct ide_port_info d = ns87415_chipset;
322 #ifdef CONFIG_SUPERIO
323 if (PCI_SLOT(dev->devfn) == 0xE) {
324 /* Built-in - assume it's under superio. */
325 d.init_iops = superio_init_iops;
326 d.tp_ops = &superio_tp_ops;
329 return ide_pci_init_one(dev, &d, NULL);
332 static const struct pci_device_id ns87415_pci_tbl[] = {
333 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87415), 0 },
336 MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl);
338 static struct pci_driver driver = {
339 .name = "NS87415_IDE",
340 .id_table = ns87415_pci_tbl,
341 .probe = ns87415_init_one,
342 .remove = ide_pci_remove,
345 static int __init ns87415_ide_init(void)
347 return ide_pci_register_driver(&driver);
350 static void __exit ns87415_ide_exit(void)
352 pci_unregister_driver(&driver);
355 module_init(ns87415_ide_init);
356 module_exit(ns87415_ide_exit);
358 MODULE_AUTHOR("Mark Lord, Eddie Dost, Andre Hedrick");
359 MODULE_DESCRIPTION("PCI driver module for NS87415 IDE");
360 MODULE_LICENSE("GPL");