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/timer.h>
15 #include <linux/ioport.h>
16 #include <linux/interrupt.h>
17 #include <linux/blkdev.h>
18 #include <linux/hdreg.h>
19 #include <linux/pci.h>
20 #include <linux/delay.h>
21 #include <linux/ide.h>
22 #include <linux/init.h>
27 /* SUPERIO 87560 is a PoS chip that NatSem denies exists.
28 * Unfortunately, it's built-in on all Astro-based PA-RISC workstations
29 * which use the integrated NS87514 cell for CD-ROM support.
30 * i.e we have to support for CD-ROM installs.
31 * See drivers/parisc/superio.c for more gory details.
33 #include <asm/superio.h>
35 static unsigned long superio_ide_status
[2];
36 static unsigned long superio_ide_select
[2];
37 static unsigned long superio_ide_dma_status
[2];
39 #define SUPERIO_IDE_MAX_RETRIES 25
41 /* Because of a defect in Super I/O, all reads of the PCI DMA status
42 * registers, IDE status register and the IDE select register need to be
45 static u8
superio_ide_inb (unsigned long port
)
47 if (port
== superio_ide_status
[0] ||
48 port
== superio_ide_status
[1] ||
49 port
== superio_ide_select
[0] ||
50 port
== superio_ide_select
[1] ||
51 port
== superio_ide_dma_status
[0] ||
52 port
== superio_ide_dma_status
[1]) {
54 int retries
= SUPERIO_IDE_MAX_RETRIES
;
56 /* printk(" [ reading port 0x%x with retry ] ", port); */
62 } while (tmp
== 0 && retries
-- > 0);
70 static void __devinit
superio_ide_init_iops (struct hwif_s
*hwif
)
72 struct pci_dev
*pdev
= to_pci_dev(hwif
->dev
);
74 u8 port
= hwif
->channel
, tmp
;
76 base
= pci_resource_start(pdev
, port
* 2) & ~3;
77 dmabase
= pci_resource_start(pdev
, 4) & ~3;
79 superio_ide_status
[port
] = base
+ IDE_STATUS_OFFSET
;
80 superio_ide_select
[port
] = base
+ IDE_SELECT_OFFSET
;
81 superio_ide_dma_status
[port
] = dmabase
+ (!port
? 2 : 0xa);
83 /* Clear error/interrupt, enable dma */
84 tmp
= superio_ide_inb(superio_ide_dma_status
[port
]);
85 outb(tmp
| 0x66, superio_ide_dma_status
[port
]);
87 /* We need to override inb to workaround a SuperIO errata */
88 hwif
->INB
= superio_ide_inb
;
91 static void __devinit
init_iops_ns87415(ide_hwif_t
*hwif
)
93 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
95 if (PCI_SLOT(dev
->devfn
) == 0xE)
96 /* Built-in - assume it's under superio. */
97 superio_ide_init_iops(hwif
);
101 static unsigned int ns87415_count
= 0, ns87415_control
[MAX_HWIFS
] = { 0 };
104 * This routine either enables/disables (according to drive->present)
105 * the IRQ associated with the port (HWIF(drive)),
106 * and selects either PIO or DMA handshaking for the next I/O operation.
108 static void ns87415_prepare_drive (ide_drive_t
*drive
, unsigned int use_dma
)
110 ide_hwif_t
*hwif
= HWIF(drive
);
111 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
112 unsigned int bit
, other
, new, *old
= (unsigned int *) hwif
->select_data
;
115 local_irq_save(flags
);
118 /* Adjust IRQ enable bit */
119 bit
= 1 << (8 + hwif
->channel
);
120 new = drive
->present
? (new & ~bit
) : (new | bit
);
122 /* Select PIO or DMA, DMA may only be selected for one drive/channel. */
123 bit
= 1 << (20 + drive
->select
.b
.unit
+ (hwif
->channel
<< 1));
124 other
= 1 << (20 + (1 - drive
->select
.b
.unit
) + (hwif
->channel
<< 1));
125 new = use_dma
? ((new & ~other
) | bit
) : (new & ~bit
);
131 * Don't change DMA engine settings while Write Buffers
134 (void) pci_read_config_byte(dev
, 0x43, &stat
);
135 while (stat
& 0x03) {
137 (void) pci_read_config_byte(dev
, 0x43, &stat
);
141 (void) pci_write_config_dword(dev
, 0x40, new);
144 * And let things settle...
149 local_irq_restore(flags
);
152 static void ns87415_selectproc (ide_drive_t
*drive
)
154 ns87415_prepare_drive (drive
, drive
->using_dma
);
157 static int ns87415_ide_dma_end (ide_drive_t
*drive
)
159 ide_hwif_t
*hwif
= HWIF(drive
);
160 u8 dma_stat
= 0, dma_cmd
= 0;
162 drive
->waiting_for_dma
= 0;
163 dma_stat
= hwif
->INB(hwif
->dma_status
);
164 /* get dma command mode */
165 dma_cmd
= hwif
->INB(hwif
->dma_command
);
167 outb(dma_cmd
& ~1, hwif
->dma_command
);
168 /* from ERRATA: clear the INTR & ERROR bits */
169 dma_cmd
= hwif
->INB(hwif
->dma_command
);
170 outb(dma_cmd
| 6, hwif
->dma_command
);
171 /* and free any DMA resources */
172 ide_destroy_dmatable(drive
);
173 /* verify good DMA status */
174 return (dma_stat
& 7) != 4;
177 static int ns87415_ide_dma_setup(ide_drive_t
*drive
)
179 /* select DMA xfer */
180 ns87415_prepare_drive(drive
, 1);
181 if (!ide_dma_setup(drive
))
183 /* DMA failed: select PIO xfer */
184 ns87415_prepare_drive(drive
, 0);
188 static void __devinit
init_hwif_ns87415 (ide_hwif_t
*hwif
)
190 struct pci_dev
*dev
= to_pci_dev(hwif
->dev
);
191 unsigned int ctrl
, using_inta
;
198 hwif
->selectproc
= &ns87415_selectproc
;
201 * We cannot probe for IRQ: both ports share common IRQ on INTA.
202 * Also, leave IRQ masked during drive probing, to prevent infinite
203 * interrupts from a potentially floating INTA..
205 * IRQs get unmasked in selectproc when drive is first used.
207 (void) pci_read_config_dword(dev
, 0x40, &ctrl
);
208 (void) pci_read_config_byte(dev
, 0x09, &progif
);
209 /* is irq in "native" mode? */
210 using_inta
= progif
& (1 << (hwif
->channel
<< 1));
212 using_inta
= ctrl
& (1 << (4 + hwif
->channel
));
214 hwif
->select_data
= hwif
->mate
->select_data
;
216 hwif
->select_data
= (unsigned long)
217 &ns87415_control
[ns87415_count
++];
218 ctrl
|= (1 << 8) | (1 << 9); /* mask both IRQs */
220 ctrl
&= ~(1 << 6); /* unmask INTA */
221 *((unsigned int *)hwif
->select_data
) = ctrl
;
222 (void) pci_write_config_dword(dev
, 0x40, ctrl
);
225 * Set prefetch size to 512 bytes for both ports,
226 * but don't turn on/off prefetching here.
228 pci_write_config_byte(dev
, 0x55, 0xee);
232 * XXX: Reset the device, if we don't it will not respond to
233 * SELECT_DRIVE() properly during first ide_probe_port().
236 outb(12, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
238 outb(8, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
241 stat
= hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
244 } while ((stat
& BUSY_STAT
) && --timeout
);
249 hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
]);
250 else if (!hwif
->irq
&& hwif
->mate
&& hwif
->mate
->irq
)
251 hwif
->irq
= hwif
->mate
->irq
; /* share IRQ with mate */
256 outb(0x60, hwif
->dma_status
);
257 hwif
->dma_setup
= &ns87415_ide_dma_setup
;
258 hwif
->ide_dma_end
= &ns87415_ide_dma_end
;
261 static const struct ide_port_info ns87415_chipset __devinitdata
= {
263 #ifdef CONFIG_SUPERIO
264 .init_iops
= init_iops_ns87415
,
266 .init_hwif
= init_hwif_ns87415
,
267 .host_flags
= IDE_HFLAG_TRUST_BIOS_FOR_DMA
|
268 IDE_HFLAG_NO_ATAPI_DMA
|
272 static int __devinit
ns87415_init_one(struct pci_dev
*dev
, const struct pci_device_id
*id
)
274 return ide_setup_pci_device(dev
, &ns87415_chipset
);
277 static const struct pci_device_id ns87415_pci_tbl
[] = {
278 { PCI_VDEVICE(NS
, PCI_DEVICE_ID_NS_87415
), 0 },
281 MODULE_DEVICE_TABLE(pci
, ns87415_pci_tbl
);
283 static struct pci_driver driver
= {
284 .name
= "NS87415_IDE",
285 .id_table
= ns87415_pci_tbl
,
286 .probe
= ns87415_init_one
,
289 static int __init
ns87415_ide_init(void)
291 return ide_pci_register_driver(&driver
);
294 module_init(ns87415_ide_init
);
296 MODULE_AUTHOR("Mark Lord, Eddie Dost, Andre Hedrick");
297 MODULE_DESCRIPTION("PCI driver module for NS87415 IDE");
298 MODULE_LICENSE("GPL");