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1#include <linux/types.h>
2#include <linux/kernel.h>
3#include <linux/ide.h>
4#include <linux/scatterlist.h>
5#include <linux/dma-mapping.h>
6#include <linux/io.h>
7
8/**
9 * config_drive_for_dma - attempt to activate IDE DMA
10 * @drive: the drive to place in DMA mode
11 *
12 * If the drive supports at least mode 2 DMA or UDMA of any kind
13 * then attempt to place it into DMA mode. Drives that are known to
14 * support DMA but predate the DMA properties or that are known
15 * to have DMA handling bugs are also set up appropriately based
16 * on the good/bad drive lists.
17 */
18
19int config_drive_for_dma(ide_drive_t *drive)
20{
21 ide_hwif_t *hwif = drive->hwif;
22 u16 *id = drive->id;
23
24 if (drive->media != ide_disk) {
25 if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
26 return 0;
27 }
28
29 /*
30 * Enable DMA on any drive that has
31 * UltraDMA (mode 0/1/2/3/4/5/6) enabled
32 */
33 if ((id[ATA_ID_FIELD_VALID] & 4) &&
34 ((id[ATA_ID_UDMA_MODES] >> 8) & 0x7f))
35 return 1;
36
37 /*
38 * Enable DMA on any drive that has mode2 DMA
39 * (multi or single) enabled
40 */
41 if ((id[ATA_ID_MWDMA_MODES] & 0x404) == 0x404 ||
42 (id[ATA_ID_SWDMA_MODES] & 0x404) == 0x404)
43 return 1;
44
45 /* Consult the list of known "good" drives */
46 if (ide_dma_good_drive(drive))
47 return 1;
48
49 return 0;
50}
51
52u8 ide_dma_sff_read_status(ide_hwif_t *hwif)
53{
54 unsigned long addr = hwif->dma_base + ATA_DMA_STATUS;
55
56 if (hwif->host_flags & IDE_HFLAG_MMIO)
57 return readb((void __iomem *)addr);
58 else
59 return inb(addr);
60}
61EXPORT_SYMBOL_GPL(ide_dma_sff_read_status);
62
63static void ide_dma_sff_write_status(ide_hwif_t *hwif, u8 val)
64{
65 unsigned long addr = hwif->dma_base + ATA_DMA_STATUS;
66
67 if (hwif->host_flags & IDE_HFLAG_MMIO)
68 writeb(val, (void __iomem *)addr);
69 else
70 outb(val, addr);
71}
72
73/**
74 * ide_dma_host_set - Enable/disable DMA on a host
75 * @drive: drive to control
76 *
77 * Enable/disable DMA on an IDE controller following generic
78 * bus-mastering IDE controller behaviour.
79 */
80
81void ide_dma_host_set(ide_drive_t *drive, int on)
82{
83 ide_hwif_t *hwif = drive->hwif;
84 u8 unit = drive->dn & 1;
85 u8 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
86
87 if (on)
88 dma_stat |= (1 << (5 + unit));
89 else
90 dma_stat &= ~(1 << (5 + unit));
91
92 ide_dma_sff_write_status(hwif, dma_stat);
93}
94EXPORT_SYMBOL_GPL(ide_dma_host_set);
95
96/**
97 * ide_build_dmatable - build IDE DMA table
98 *
99 * ide_build_dmatable() prepares a dma request. We map the command
100 * to get the pci bus addresses of the buffers and then build up
101 * the PRD table that the IDE layer wants to be fed.
102 *
103 * Most chipsets correctly interpret a length of 0x0000 as 64KB,
104 * but at least one (e.g. CS5530) misinterprets it as zero (!).
105 * So we break the 64KB entry into two 32KB entries instead.
106 *
107 * Returns the number of built PRD entries if all went okay,
108 * returns 0 otherwise.
109 *
110 * May also be invoked from trm290.c
111 */
112
113int ide_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
114{
115 ide_hwif_t *hwif = drive->hwif;
116 __le32 *table = (__le32 *)hwif->dmatable_cpu;
117 unsigned int count = 0;
118 int i;
119 struct scatterlist *sg;
120 u8 is_trm290 = !!(hwif->host_flags & IDE_HFLAG_TRM290);
121
122 for_each_sg(hwif->sg_table, sg, cmd->sg_nents, i) {
123 u32 cur_addr, cur_len, xcount, bcount;
124
125 cur_addr = sg_dma_address(sg);
126 cur_len = sg_dma_len(sg);
127
128 /*
129 * Fill in the dma table, without crossing any 64kB boundaries.
130 * Most hardware requires 16-bit alignment of all blocks,
131 * but the trm290 requires 32-bit alignment.
132 */
133
134 while (cur_len) {
135 if (count++ >= PRD_ENTRIES)
136 goto use_pio_instead;
137
138 bcount = 0x10000 - (cur_addr & 0xffff);
139 if (bcount > cur_len)
140 bcount = cur_len;
141 *table++ = cpu_to_le32(cur_addr);
142 xcount = bcount & 0xffff;
143 if (is_trm290)
144 xcount = ((xcount >> 2) - 1) << 16;
145 else if (xcount == 0x0000) {
146 if (count++ >= PRD_ENTRIES)
147 goto use_pio_instead;
148 *table++ = cpu_to_le32(0x8000);
149 *table++ = cpu_to_le32(cur_addr + 0x8000);
150 xcount = 0x8000;
151 }
152 *table++ = cpu_to_le32(xcount);
153 cur_addr += bcount;
154 cur_len -= bcount;
155 }
156 }
157
158 if (count) {
159 if (!is_trm290)
160 *--table |= cpu_to_le32(0x80000000);
161 return count;
162 }
163
164use_pio_instead:
165 printk(KERN_ERR "%s: %s\n", drive->name,
166 count ? "DMA table too small" : "empty DMA table?");
167
168 return 0; /* revert to PIO for this request */
169}
170EXPORT_SYMBOL_GPL(ide_build_dmatable);
171
172/**
173 * ide_dma_setup - begin a DMA phase
174 * @drive: target device
175 * @cmd: command
176 *
177 * Build an IDE DMA PRD (IDE speak for scatter gather table)
178 * and then set up the DMA transfer registers for a device
179 * that follows generic IDE PCI DMA behaviour. Controllers can
180 * override this function if they need to
181 *
182 * Returns 0 on success. If a PIO fallback is required then 1
183 * is returned.
184 */
185
186int ide_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
187{
188 ide_hwif_t *hwif = drive->hwif;
189 u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
190 u8 rw = (cmd->tf_flags & IDE_TFLAG_WRITE) ? 0 : ATA_DMA_WR;
191 u8 dma_stat;
192
193 /* fall back to pio! */
194 if (ide_build_dmatable(drive, cmd) == 0) {
195 ide_map_sg(drive, cmd);
196 return 1;
197 }
198
199 /* PRD table */
200 if (mmio)
201 writel(hwif->dmatable_dma,
202 (void __iomem *)(hwif->dma_base + ATA_DMA_TABLE_OFS));
203 else
204 outl(hwif->dmatable_dma, hwif->dma_base + ATA_DMA_TABLE_OFS);
205
206 /* specify r/w */
207 if (mmio)
208 writeb(rw, (void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
209 else
210 outb(rw, hwif->dma_base + ATA_DMA_CMD);
211
212 /* read DMA status for INTR & ERROR flags */
213 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
214
215 /* clear INTR & ERROR flags */
216 ide_dma_sff_write_status(hwif, dma_stat | ATA_DMA_ERR | ATA_DMA_INTR);
217
218 return 0;
219}
220EXPORT_SYMBOL_GPL(ide_dma_setup);
221
222/**
223 * ide_dma_sff_timer_expiry - handle a DMA timeout
224 * @drive: Drive that timed out
225 *
226 * An IDE DMA transfer timed out. In the event of an error we ask
227 * the driver to resolve the problem, if a DMA transfer is still
228 * in progress we continue to wait (arguably we need to add a
229 * secondary 'I don't care what the drive thinks' timeout here)
230 * Finally if we have an interrupt we let it complete the I/O.
231 * But only one time - we clear expiry and if it's still not
232 * completed after WAIT_CMD, we error and retry in PIO.
233 * This can occur if an interrupt is lost or due to hang or bugs.
234 */
235
236int ide_dma_sff_timer_expiry(ide_drive_t *drive)
237{
238 ide_hwif_t *hwif = drive->hwif;
239 u8 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
240
241 printk(KERN_WARNING "%s: %s: DMA status (0x%02x)\n",
242 drive->name, __func__, dma_stat);
243
244 if ((dma_stat & 0x18) == 0x18) /* BUSY Stupid Early Timer !! */
245 return WAIT_CMD;
246
247 hwif->expiry = NULL; /* one free ride for now */
248
249 if (dma_stat & ATA_DMA_ERR) /* ERROR */
250 return -1;
251
252 if (dma_stat & ATA_DMA_ACTIVE) /* DMAing */
253 return WAIT_CMD;
254
255 if (dma_stat & ATA_DMA_INTR) /* Got an Interrupt */
256 return WAIT_CMD;
257
258 return 0; /* Status is unknown -- reset the bus */
259}
260EXPORT_SYMBOL_GPL(ide_dma_sff_timer_expiry);
261
262void ide_dma_start(ide_drive_t *drive)
263{
264 ide_hwif_t *hwif = drive->hwif;
265 u8 dma_cmd;
266
267 /* Note that this is done *after* the cmd has
268 * been issued to the drive, as per the BM-IDE spec.
269 * The Promise Ultra33 doesn't work correctly when
270 * we do this part before issuing the drive cmd.
271 */
272 if (hwif->host_flags & IDE_HFLAG_MMIO) {
273 dma_cmd = readb((void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
274 writeb(dma_cmd | ATA_DMA_START,
275 (void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
276 } else {
277 dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
278 outb(dma_cmd | ATA_DMA_START, hwif->dma_base + ATA_DMA_CMD);
279 }
280}
281EXPORT_SYMBOL_GPL(ide_dma_start);
282
283/* returns 1 on error, 0 otherwise */
284int ide_dma_end(ide_drive_t *drive)
285{
286 ide_hwif_t *hwif = drive->hwif;
287 u8 dma_stat = 0, dma_cmd = 0;
288
289 /* stop DMA */
290 if (hwif->host_flags & IDE_HFLAG_MMIO) {
291 dma_cmd = readb((void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
292 writeb(dma_cmd & ~ATA_DMA_START,
293 (void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
294 } else {
295 dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
296 outb(dma_cmd & ~ATA_DMA_START, hwif->dma_base + ATA_DMA_CMD);
297 }
298
299 /* get DMA status */
300 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
301
302 /* clear INTR & ERROR bits */
303 ide_dma_sff_write_status(hwif, dma_stat | ATA_DMA_ERR | ATA_DMA_INTR);
304
305#define CHECK_DMA_MASK (ATA_DMA_ACTIVE | ATA_DMA_ERR | ATA_DMA_INTR)
306
307 /* verify good DMA status */
308 if ((dma_stat & CHECK_DMA_MASK) != ATA_DMA_INTR)
309 return 0x10 | dma_stat;
310 return 0;
311}
312EXPORT_SYMBOL_GPL(ide_dma_end);
313
314/* returns 1 if dma irq issued, 0 otherwise */
315int ide_dma_test_irq(ide_drive_t *drive)
316{
317 ide_hwif_t *hwif = drive->hwif;
318 u8 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
319
320 return (dma_stat & ATA_DMA_INTR) ? 1 : 0;
321}
322EXPORT_SYMBOL_GPL(ide_dma_test_irq);
323
324const struct ide_dma_ops sff_dma_ops = {
325 .dma_host_set = ide_dma_host_set,
326 .dma_setup = ide_dma_setup,
327 .dma_start = ide_dma_start,
328 .dma_end = ide_dma_end,
329 .dma_test_irq = ide_dma_test_irq,
330 .dma_lost_irq = ide_dma_lost_irq,
331 .dma_timer_expiry = ide_dma_sff_timer_expiry,
332 .dma_sff_read_status = ide_dma_sff_read_status,
333};
334EXPORT_SYMBOL_GPL(sff_dma_ops);
1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/types.h>
3#include <linux/kernel.h>
4#include <linux/export.h>
5#include <linux/ide.h>
6#include <linux/scatterlist.h>
7#include <linux/dma-mapping.h>
8#include <linux/io.h>
9
10/**
11 * config_drive_for_dma - attempt to activate IDE DMA
12 * @drive: the drive to place in DMA mode
13 *
14 * If the drive supports at least mode 2 DMA or UDMA of any kind
15 * then attempt to place it into DMA mode. Drives that are known to
16 * support DMA but predate the DMA properties or that are known
17 * to have DMA handling bugs are also set up appropriately based
18 * on the good/bad drive lists.
19 */
20
21int config_drive_for_dma(ide_drive_t *drive)
22{
23 ide_hwif_t *hwif = drive->hwif;
24 u16 *id = drive->id;
25
26 if (drive->media != ide_disk) {
27 if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
28 return 0;
29 }
30
31 /*
32 * Enable DMA on any drive that has
33 * UltraDMA (mode 0/1/2/3/4/5/6) enabled
34 */
35 if ((id[ATA_ID_FIELD_VALID] & 4) &&
36 ((id[ATA_ID_UDMA_MODES] >> 8) & 0x7f))
37 return 1;
38
39 /*
40 * Enable DMA on any drive that has mode2 DMA
41 * (multi or single) enabled
42 */
43 if ((id[ATA_ID_MWDMA_MODES] & 0x404) == 0x404 ||
44 (id[ATA_ID_SWDMA_MODES] & 0x404) == 0x404)
45 return 1;
46
47 /* Consult the list of known "good" drives */
48 if (ide_dma_good_drive(drive))
49 return 1;
50
51 return 0;
52}
53
54u8 ide_dma_sff_read_status(ide_hwif_t *hwif)
55{
56 unsigned long addr = hwif->dma_base + ATA_DMA_STATUS;
57
58 if (hwif->host_flags & IDE_HFLAG_MMIO)
59 return readb((void __iomem *)addr);
60 else
61 return inb(addr);
62}
63EXPORT_SYMBOL_GPL(ide_dma_sff_read_status);
64
65static void ide_dma_sff_write_status(ide_hwif_t *hwif, u8 val)
66{
67 unsigned long addr = hwif->dma_base + ATA_DMA_STATUS;
68
69 if (hwif->host_flags & IDE_HFLAG_MMIO)
70 writeb(val, (void __iomem *)addr);
71 else
72 outb(val, addr);
73}
74
75/**
76 * ide_dma_host_set - Enable/disable DMA on a host
77 * @drive: drive to control
78 *
79 * Enable/disable DMA on an IDE controller following generic
80 * bus-mastering IDE controller behaviour.
81 */
82
83void ide_dma_host_set(ide_drive_t *drive, int on)
84{
85 ide_hwif_t *hwif = drive->hwif;
86 u8 unit = drive->dn & 1;
87 u8 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
88
89 if (on)
90 dma_stat |= (1 << (5 + unit));
91 else
92 dma_stat &= ~(1 << (5 + unit));
93
94 ide_dma_sff_write_status(hwif, dma_stat);
95}
96EXPORT_SYMBOL_GPL(ide_dma_host_set);
97
98/**
99 * ide_build_dmatable - build IDE DMA table
100 *
101 * ide_build_dmatable() prepares a dma request. We map the command
102 * to get the pci bus addresses of the buffers and then build up
103 * the PRD table that the IDE layer wants to be fed.
104 *
105 * Most chipsets correctly interpret a length of 0x0000 as 64KB,
106 * but at least one (e.g. CS5530) misinterprets it as zero (!).
107 * So we break the 64KB entry into two 32KB entries instead.
108 *
109 * Returns the number of built PRD entries if all went okay,
110 * returns 0 otherwise.
111 *
112 * May also be invoked from trm290.c
113 */
114
115int ide_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
116{
117 ide_hwif_t *hwif = drive->hwif;
118 __le32 *table = (__le32 *)hwif->dmatable_cpu;
119 unsigned int count = 0;
120 int i;
121 struct scatterlist *sg;
122 u8 is_trm290 = !!(hwif->host_flags & IDE_HFLAG_TRM290);
123
124 for_each_sg(hwif->sg_table, sg, cmd->sg_nents, i) {
125 u32 cur_addr, cur_len, xcount, bcount;
126
127 cur_addr = sg_dma_address(sg);
128 cur_len = sg_dma_len(sg);
129
130 /*
131 * Fill in the dma table, without crossing any 64kB boundaries.
132 * Most hardware requires 16-bit alignment of all blocks,
133 * but the trm290 requires 32-bit alignment.
134 */
135
136 while (cur_len) {
137 if (count++ >= PRD_ENTRIES)
138 goto use_pio_instead;
139
140 bcount = 0x10000 - (cur_addr & 0xffff);
141 if (bcount > cur_len)
142 bcount = cur_len;
143 *table++ = cpu_to_le32(cur_addr);
144 xcount = bcount & 0xffff;
145 if (is_trm290)
146 xcount = ((xcount >> 2) - 1) << 16;
147 else if (xcount == 0x0000) {
148 if (count++ >= PRD_ENTRIES)
149 goto use_pio_instead;
150 *table++ = cpu_to_le32(0x8000);
151 *table++ = cpu_to_le32(cur_addr + 0x8000);
152 xcount = 0x8000;
153 }
154 *table++ = cpu_to_le32(xcount);
155 cur_addr += bcount;
156 cur_len -= bcount;
157 }
158 }
159
160 if (count) {
161 if (!is_trm290)
162 *--table |= cpu_to_le32(0x80000000);
163 return count;
164 }
165
166use_pio_instead:
167 printk(KERN_ERR "%s: %s\n", drive->name,
168 count ? "DMA table too small" : "empty DMA table?");
169
170 return 0; /* revert to PIO for this request */
171}
172EXPORT_SYMBOL_GPL(ide_build_dmatable);
173
174/**
175 * ide_dma_setup - begin a DMA phase
176 * @drive: target device
177 * @cmd: command
178 *
179 * Build an IDE DMA PRD (IDE speak for scatter gather table)
180 * and then set up the DMA transfer registers for a device
181 * that follows generic IDE PCI DMA behaviour. Controllers can
182 * override this function if they need to
183 *
184 * Returns 0 on success. If a PIO fallback is required then 1
185 * is returned.
186 */
187
188int ide_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
189{
190 ide_hwif_t *hwif = drive->hwif;
191 u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
192 u8 rw = (cmd->tf_flags & IDE_TFLAG_WRITE) ? 0 : ATA_DMA_WR;
193 u8 dma_stat;
194
195 /* fall back to pio! */
196 if (ide_build_dmatable(drive, cmd) == 0) {
197 ide_map_sg(drive, cmd);
198 return 1;
199 }
200
201 /* PRD table */
202 if (mmio)
203 writel(hwif->dmatable_dma,
204 (void __iomem *)(hwif->dma_base + ATA_DMA_TABLE_OFS));
205 else
206 outl(hwif->dmatable_dma, hwif->dma_base + ATA_DMA_TABLE_OFS);
207
208 /* specify r/w */
209 if (mmio)
210 writeb(rw, (void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
211 else
212 outb(rw, hwif->dma_base + ATA_DMA_CMD);
213
214 /* read DMA status for INTR & ERROR flags */
215 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
216
217 /* clear INTR & ERROR flags */
218 ide_dma_sff_write_status(hwif, dma_stat | ATA_DMA_ERR | ATA_DMA_INTR);
219
220 return 0;
221}
222EXPORT_SYMBOL_GPL(ide_dma_setup);
223
224/**
225 * ide_dma_sff_timer_expiry - handle a DMA timeout
226 * @drive: Drive that timed out
227 *
228 * An IDE DMA transfer timed out. In the event of an error we ask
229 * the driver to resolve the problem, if a DMA transfer is still
230 * in progress we continue to wait (arguably we need to add a
231 * secondary 'I don't care what the drive thinks' timeout here)
232 * Finally if we have an interrupt we let it complete the I/O.
233 * But only one time - we clear expiry and if it's still not
234 * completed after WAIT_CMD, we error and retry in PIO.
235 * This can occur if an interrupt is lost or due to hang or bugs.
236 */
237
238int ide_dma_sff_timer_expiry(ide_drive_t *drive)
239{
240 ide_hwif_t *hwif = drive->hwif;
241 u8 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
242
243 printk(KERN_WARNING "%s: %s: DMA status (0x%02x)\n",
244 drive->name, __func__, dma_stat);
245
246 if ((dma_stat & 0x18) == 0x18) /* BUSY Stupid Early Timer !! */
247 return WAIT_CMD;
248
249 hwif->expiry = NULL; /* one free ride for now */
250
251 if (dma_stat & ATA_DMA_ERR) /* ERROR */
252 return -1;
253
254 if (dma_stat & ATA_DMA_ACTIVE) /* DMAing */
255 return WAIT_CMD;
256
257 if (dma_stat & ATA_DMA_INTR) /* Got an Interrupt */
258 return WAIT_CMD;
259
260 return 0; /* Status is unknown -- reset the bus */
261}
262EXPORT_SYMBOL_GPL(ide_dma_sff_timer_expiry);
263
264void ide_dma_start(ide_drive_t *drive)
265{
266 ide_hwif_t *hwif = drive->hwif;
267 u8 dma_cmd;
268
269 /* Note that this is done *after* the cmd has
270 * been issued to the drive, as per the BM-IDE spec.
271 * The Promise Ultra33 doesn't work correctly when
272 * we do this part before issuing the drive cmd.
273 */
274 if (hwif->host_flags & IDE_HFLAG_MMIO) {
275 dma_cmd = readb((void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
276 writeb(dma_cmd | ATA_DMA_START,
277 (void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
278 } else {
279 dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
280 outb(dma_cmd | ATA_DMA_START, hwif->dma_base + ATA_DMA_CMD);
281 }
282}
283EXPORT_SYMBOL_GPL(ide_dma_start);
284
285/* returns 1 on error, 0 otherwise */
286int ide_dma_end(ide_drive_t *drive)
287{
288 ide_hwif_t *hwif = drive->hwif;
289 u8 dma_stat = 0, dma_cmd = 0;
290
291 /* stop DMA */
292 if (hwif->host_flags & IDE_HFLAG_MMIO) {
293 dma_cmd = readb((void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
294 writeb(dma_cmd & ~ATA_DMA_START,
295 (void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
296 } else {
297 dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
298 outb(dma_cmd & ~ATA_DMA_START, hwif->dma_base + ATA_DMA_CMD);
299 }
300
301 /* get DMA status */
302 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
303
304 /* clear INTR & ERROR bits */
305 ide_dma_sff_write_status(hwif, dma_stat | ATA_DMA_ERR | ATA_DMA_INTR);
306
307#define CHECK_DMA_MASK (ATA_DMA_ACTIVE | ATA_DMA_ERR | ATA_DMA_INTR)
308
309 /* verify good DMA status */
310 if ((dma_stat & CHECK_DMA_MASK) != ATA_DMA_INTR)
311 return 0x10 | dma_stat;
312 return 0;
313}
314EXPORT_SYMBOL_GPL(ide_dma_end);
315
316/* returns 1 if dma irq issued, 0 otherwise */
317int ide_dma_test_irq(ide_drive_t *drive)
318{
319 ide_hwif_t *hwif = drive->hwif;
320 u8 dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
321
322 return (dma_stat & ATA_DMA_INTR) ? 1 : 0;
323}
324EXPORT_SYMBOL_GPL(ide_dma_test_irq);
325
326const struct ide_dma_ops sff_dma_ops = {
327 .dma_host_set = ide_dma_host_set,
328 .dma_setup = ide_dma_setup,
329 .dma_start = ide_dma_start,
330 .dma_end = ide_dma_end,
331 .dma_test_irq = ide_dma_test_irq,
332 .dma_lost_irq = ide_dma_lost_irq,
333 .dma_timer_expiry = ide_dma_sff_timer_expiry,
334 .dma_sff_read_status = ide_dma_sff_read_status,
335};
336EXPORT_SYMBOL_GPL(sff_dma_ops);