2 * Copyright (c) 1997-1998 Mark Lord
3 * Copyright (c) 2007 MontaVista Software, Inc. <source@mvista.com>
5 * May be copied or modified under the terms of the GNU General Public License
7 * June 22, 2004 - get rid of check_region
13 * This module provides support for the bus-master IDE DMA function
14 * of the Tekram TRM290 chip, used on a variety of PCI IDE add-on boards,
15 * including a "Precision Instruments" board. The TRM290 pre-dates
16 * the sff-8038 standard (ide-dma.c) by a few months, and differs
17 * significantly enough to warrant separate routines for some functions,
18 * while re-using others from ide-dma.c.
20 * EXPERIMENTAL! It works for me (a sample of one).
22 * Works reliably for me in DMA mode (READs only),
23 * DMA WRITEs are disabled by default (see #define below);
25 * DMA is not enabled automatically for this chipset,
26 * but can be turned on manually (with "hdparm -d1") at run time.
28 * I need volunteers with "spare" drives for further testing
29 * and development, and maybe to help figure out the peculiarities.
30 * Even knowing the registers (below), some things behave strangely.
33 #define TRM290_NO_DMA_WRITES /* DMA writes seem unreliable sometimes */
36 * TRM-290 PCI-IDE2 Bus Master Chip
37 * ================================
38 * The configuration registers are addressed in normal I/O port space
39 * and are used as follows:
41 * trm290_base depends on jumper settings, and is probed for by ide-dma.c
43 * trm290_base+2 when WRITTEN: chiptest register (byte, write-only)
44 * bit7 must always be written as "1"
46 * bit1 1=legacy_compatible_mode, 0=native_pci_mode
47 * bit0 1=test_mode, 0=normal(default)
49 * trm290_base+2 when READ: status register (byte, read-only)
51 * bit1 channel0 busmaster interrupt status 0=none, 1=asserted
52 * bit0 channel0 interrupt status 0=none, 1=asserted
54 * trm290_base+3 Interrupt mask register
56 * bit4 legacy_header: 1=present, 0=absent
57 * bit3 channel1 busmaster interrupt status 0=none, 1=asserted (read only)
58 * bit2 channel1 interrupt status 0=none, 1=asserted (read only)
59 * bit1 channel1 interrupt mask: 1=masked, 0=unmasked(default)
60 * bit0 channel0 interrupt mask: 1=masked, 0=unmasked(default)
62 * trm290_base+1 "CPR" Config Pointer Register (byte)
63 * bit7 1=autoincrement CPR bits 2-0 after each access of CDR
64 * bit6 1=min. 1 wait-state posted write cycle (default), 0=0 wait-state
65 * bit5 0=enabled master burst access (default), 1=disable (write only)
66 * bit4 PCI DEVSEL# timing select: 1=medium(default), 0=fast
67 * bit3 0=primary IDE channel, 1=secondary IDE channel
68 * bits2-0 register index for accesses through CDR port
70 * trm290_base+0 "CDR" Config Data Register (word)
71 * two sets of seven config registers,
72 * selected by CPR bit 3 (channel) and CPR bits 2-0 (index 0 to 6),
73 * each index defined below:
75 * Index-0 Base address register for command block (word)
76 * defaults: 0x1f0 for primary, 0x170 for secondary
78 * Index-1 general config register (byte)
79 * bit7 1=DMA enable, 0=DMA disable
80 * bit6 1=activate IDE_RESET, 0=no action (default)
81 * bit5 1=enable IORDY, 0=disable IORDY (default)
82 * bit4 0=16-bit data port(default), 1=8-bit (XT) data port
83 * bit3 interrupt polarity: 1=active_low, 0=active_high(default)
84 * bit2 power-saving-mode(?): 1=enable, 0=disable(default) (write only)
85 * bit1 bus_master_mode(?): 1=enable, 0=disable(default)
86 * bit0 enable_io_ports: 1=enable(default), 0=disable
88 * Index-2 read-ahead counter preload bits 0-7 (byte, write only)
89 * bits7-0 bits7-0 of readahead count
91 * Index-3 read-ahead config register (byte, write only)
92 * bit7 1=enable_readahead, 0=disable_readahead(default)
93 * bit6 1=clear_FIFO, 0=no_action
95 * bit4 mode4 timing control: 1=enable, 0=disable(default)
98 * bits1-0 bits9-8 of read-ahead count
100 * Index-4 base address register for control block (word)
101 * defaults: 0x3f6 for primary, 0x376 for secondary
103 * Index-5 data port timings (shared by both drives) (byte)
104 * standard PCI "clk" (clock) counts, default value = 0xf5
106 * bits7-6 setup time: 00=1clk, 01=2clk, 10=3clk, 11=4clk
107 * bits5-3 hold time: 000=1clk, 001=2clk, 010=3clk,
108 * 011=4clk, 100=5clk, 101=6clk,
109 * 110=8clk, 111=12clk
110 * bits2-0 active time: 000=2clk, 001=3clk, 010=4clk,
111 * 011=5clk, 100=6clk, 101=8clk,
112 * 110=12clk, 111=16clk
114 * Index-6 command/control port timings (shared by both drives) (byte)
115 * same layout as Index-5, default value = 0xde
117 * Suggested CDR programming for PIO mode0 (600ns):
118 * 0x01f0,0x21,0xff,0x80,0x03f6,0xf5,0xde ; primary
119 * 0x0170,0x21,0xff,0x80,0x0376,0xf5,0xde ; secondary
121 * Suggested CDR programming for PIO mode3 (180ns):
122 * 0x01f0,0x21,0xff,0x80,0x03f6,0x09,0xde ; primary
123 * 0x0170,0x21,0xff,0x80,0x0376,0x09,0xde ; secondary
125 * Suggested CDR programming for PIO mode4 (120ns):
126 * 0x01f0,0x21,0xff,0x80,0x03f6,0x00,0xde ; primary
127 * 0x0170,0x21,0xff,0x80,0x0376,0x00,0xde ; secondary
131 #include <linux/types.h>
132 #include <linux/module.h>
133 #include <linux/kernel.h>
134 #include <linux/ioport.h>
135 #include <linux/interrupt.h>
136 #include <linux/blkdev.h>
137 #include <linux/init.h>
138 #include <linux/hdreg.h>
139 #include <linux/pci.h>
140 #include <linux/ide.h>
144 static void trm290_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
146 ide_hwif_t *hwif = HWIF(drive);
150 /* select PIO or DMA */
151 reg = use_dma ? (0x21 | 0x82) : (0x21 & ~0x82);
153 local_irq_save(flags);
155 if (reg != hwif->select_data) {
156 hwif->select_data = reg;
158 outb(0x51 | (hwif->channel << 3), hwif->config_data + 1);
159 outw(reg & 0xff, hwif->config_data);
162 /* enable IRQ if not probing */
163 if (drive->present) {
164 reg = inw(hwif->config_data + 3);
166 reg &= ~(1 << hwif->channel);
167 outw(reg, hwif->config_data + 3);
170 local_irq_restore(flags);
173 static void trm290_selectproc (ide_drive_t *drive)
175 trm290_prepare_drive(drive, drive->using_dma);
178 static void trm290_dma_exec_cmd(ide_drive_t *drive, u8 command)
180 BUG_ON(HWGROUP(drive)->handler != NULL); /* paranoia check */
181 ide_set_handler(drive, &ide_dma_intr, WAIT_CMD, NULL);
182 /* issue cmd to drive */
183 outb(command, IDE_COMMAND_REG);
186 static int trm290_dma_setup(ide_drive_t *drive)
188 ide_hwif_t *hwif = drive->hwif;
189 struct request *rq = hwif->hwgroup->rq;
190 unsigned int count, rw;
192 if (rq_data_dir(rq)) {
193 #ifdef TRM290_NO_DMA_WRITES
194 /* always use PIO for writes */
195 trm290_prepare_drive(drive, 0); /* select PIO xfer */
202 if (!(count = ide_build_dmatable(drive, rq))) {
203 /* try PIO instead of DMA */
204 trm290_prepare_drive(drive, 0); /* select PIO xfer */
207 /* select DMA xfer */
208 trm290_prepare_drive(drive, 1);
209 outl(hwif->dmatable_dma | rw, hwif->dma_base);
210 drive->waiting_for_dma = 1;
212 outw(count * 2 - 1, hwif->dma_base + 2);
216 static void trm290_dma_start(ide_drive_t *drive)
220 static int trm290_ide_dma_end (ide_drive_t *drive)
224 drive->waiting_for_dma = 0;
225 /* purge DMA mappings */
226 ide_destroy_dmatable(drive);
227 status = inw(HWIF(drive)->dma_base + 2);
228 return status != 0x00ff;
231 static int trm290_ide_dma_test_irq (ide_drive_t *drive)
235 status = inw(HWIF(drive)->dma_base + 2);
236 return status == 0x00ff;
239 static void trm290_dma_host_set(ide_drive_t *drive, int on)
243 static void __devinit init_hwif_trm290(ide_hwif_t *hwif)
245 struct pci_dev *dev = to_pci_dev(hwif->dev);
246 unsigned int cfg_base = pci_resource_start(dev, 4);
250 if ((dev->class & 5) && cfg_base)
251 printk(KERN_INFO "TRM290: chip");
254 printk(KERN_INFO "TRM290: using default");
256 printk(KERN_CONT " config base at 0x%04x\n", cfg_base);
257 hwif->config_data = cfg_base;
258 hwif->dma_base = (cfg_base + 4) ^ (hwif->channel ? 0x80 : 0);
260 printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx",
261 hwif->name, hwif->dma_base, hwif->dma_base + 3);
263 if (!request_region(hwif->dma_base, 4, hwif->name)) {
264 printk(KERN_CONT " -- Error, ports in use.\n");
268 hwif->dmatable_cpu = pci_alloc_consistent(dev, PRD_ENTRIES * PRD_BYTES,
269 &hwif->dmatable_dma);
270 if (!hwif->dmatable_cpu) {
271 printk(KERN_CONT " -- Error, unable to allocate DMA table.\n");
272 release_region(hwif->dma_base, 4);
275 printk(KERN_CONT "\n");
277 local_irq_save(flags);
278 /* put config reg into first byte of hwif->select_data */
279 outb(0x51 | (hwif->channel << 3), hwif->config_data + 1);
280 /* select PIO as default */
281 hwif->select_data = 0x21;
282 outb(hwif->select_data, hwif->config_data);
284 reg = inb(hwif->config_data + 3);
285 /* mask IRQs for both ports */
286 reg = (reg & 0x10) | 0x03;
287 outb(reg, hwif->config_data + 3);
288 local_irq_restore(flags);
292 hwif->irq = hwif->channel ? 15 : 14;
293 else if (!hwif->irq && hwif->mate && hwif->mate->irq)
294 /* sharing IRQ with mate */
295 hwif->irq = hwif->mate->irq;
297 hwif->dma_host_set = &trm290_dma_host_set;
298 hwif->dma_setup = &trm290_dma_setup;
299 hwif->dma_exec_cmd = &trm290_dma_exec_cmd;
300 hwif->dma_start = &trm290_dma_start;
301 hwif->ide_dma_end = &trm290_ide_dma_end;
302 hwif->ide_dma_test_irq = &trm290_ide_dma_test_irq;
304 hwif->selectproc = &trm290_selectproc;
308 * My trm290-based card doesn't seem to work with all possible values
309 * for the control basereg, so this kludge ensures that we use only
310 * values that are known to work. Ugh. -ml
312 u16 new, old, compat = hwif->channel ? 0x374 : 0x3f4;
313 static u16 next_offset = 0;
316 outb(0x54 | (hwif->channel << 3), hwif->config_data + 1);
317 old = inw(hwif->config_data);
319 old_mask = inb(old + 2);
320 if (old != compat && old_mask == 0xff) {
321 /* leave lower 10 bits untouched */
322 compat += (next_offset += 0x400);
323 hwif->io_ports[IDE_CONTROL_OFFSET] = compat + 2;
324 outw(compat | 1, hwif->config_data);
325 new = inw(hwif->config_data);
326 printk(KERN_INFO "%s: control basereg workaround: "
327 "old=0x%04x, new=0x%04x\n",
328 hwif->name, old, new & ~1);
334 static const struct ide_port_info trm290_chipset __devinitdata = {
336 .init_hwif = init_hwif_trm290,
337 .chipset = ide_trm290,
338 .host_flags = IDE_HFLAG_NO_ATAPI_DMA |
339 #if 0 /* play it safe for now */
340 IDE_HFLAG_TRUST_BIOS_FOR_DMA |
342 IDE_HFLAG_NO_AUTODMA |
347 static int __devinit trm290_init_one(struct pci_dev *dev, const struct pci_device_id *id)
349 return ide_setup_pci_device(dev, &trm290_chipset);
352 static const struct pci_device_id trm290_pci_tbl[] = {
353 { PCI_VDEVICE(TEKRAM, PCI_DEVICE_ID_TEKRAM_DC290), 0 },
356 MODULE_DEVICE_TABLE(pci, trm290_pci_tbl);
358 static struct pci_driver driver = {
359 .name = "TRM290_IDE",
360 .id_table = trm290_pci_tbl,
361 .probe = trm290_init_one,
364 static int __init trm290_ide_init(void)
366 return ide_pci_register_driver(&driver);
369 module_init(trm290_ide_init);
371 MODULE_AUTHOR("Mark Lord");
372 MODULE_DESCRIPTION("PCI driver module for Tekram TRM290 IDE");
373 MODULE_LICENSE("GPL");