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2dc6c6f1 MV |
1 | /* |
2 | * Generic PXA PATA driver | |
3 | * | |
4 | * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; see the file COPYING. If not, write to | |
18 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
2dc6c6f1 MV |
23 | #include <linux/blkdev.h> |
24 | #include <linux/ata.h> | |
25 | #include <linux/libata.h> | |
26 | #include <linux/platform_device.h> | |
88622d80 | 27 | #include <linux/dmaengine.h> |
2dc6c6f1 MV |
28 | #include <linux/gpio.h> |
29 | #include <linux/slab.h> | |
30 | #include <linux/completion.h> | |
31 | ||
32 | #include <scsi/scsi_host.h> | |
33 | ||
293b2da1 | 34 | #include <linux/platform_data/ata-pxa.h> |
2dc6c6f1 MV |
35 | |
36 | #define DRV_NAME "pata_pxa" | |
37 | #define DRV_VERSION "0.1" | |
38 | ||
39 | struct pata_pxa_data { | |
88622d80 RJ |
40 | struct dma_chan *dma_chan; |
41 | dma_cookie_t dma_cookie; | |
2dc6c6f1 MV |
42 | struct completion dma_done; |
43 | }; | |
44 | ||
45 | /* | |
88622d80 | 46 | * DMA interrupt handler. |
2dc6c6f1 | 47 | */ |
88622d80 | 48 | static void pxa_ata_dma_irq(void *d) |
2dc6c6f1 | 49 | { |
88622d80 RJ |
50 | struct pata_pxa_data *pd = d; |
51 | enum dma_status status; | |
2dc6c6f1 | 52 | |
88622d80 RJ |
53 | status = dmaengine_tx_status(pd->dma_chan, pd->dma_cookie, NULL); |
54 | if (status == DMA_ERROR || status == DMA_COMPLETE) | |
55 | complete(&pd->dma_done); | |
2dc6c6f1 MV |
56 | } |
57 | ||
58 | /* | |
59 | * Prepare taskfile for submission. | |
60 | */ | |
61 | static void pxa_qc_prep(struct ata_queued_cmd *qc) | |
62 | { | |
63 | struct pata_pxa_data *pd = qc->ap->private_data; | |
88622d80 RJ |
64 | struct dma_async_tx_descriptor *tx; |
65 | enum dma_transfer_direction dir; | |
2dc6c6f1 MV |
66 | |
67 | if (!(qc->flags & ATA_QCFLAG_DMAMAP)) | |
68 | return; | |
69 | ||
88622d80 RJ |
70 | dir = (qc->dma_dir == DMA_TO_DEVICE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM); |
71 | tx = dmaengine_prep_slave_sg(pd->dma_chan, qc->sg, qc->n_elem, dir, | |
72 | DMA_PREP_INTERRUPT); | |
73 | if (!tx) { | |
74 | ata_dev_err(qc->dev, "prep_slave_sg() failed\n"); | |
75 | return; | |
76 | } | |
77 | tx->callback = pxa_ata_dma_irq; | |
78 | tx->callback_param = pd; | |
79 | pd->dma_cookie = dmaengine_submit(tx); | |
2dc6c6f1 MV |
80 | } |
81 | ||
82 | /* | |
83 | * Configure the DMA controller, load the DMA descriptors, but don't start the | |
84 | * DMA controller yet. Only issue the ATA command. | |
85 | */ | |
86 | static void pxa_bmdma_setup(struct ata_queued_cmd *qc) | |
87 | { | |
88 | qc->ap->ops->sff_exec_command(qc->ap, &qc->tf); | |
89 | } | |
90 | ||
91 | /* | |
92 | * Execute the DMA transfer. | |
93 | */ | |
94 | static void pxa_bmdma_start(struct ata_queued_cmd *qc) | |
95 | { | |
96 | struct pata_pxa_data *pd = qc->ap->private_data; | |
97 | init_completion(&pd->dma_done); | |
88622d80 | 98 | dma_async_issue_pending(pd->dma_chan); |
2dc6c6f1 MV |
99 | } |
100 | ||
101 | /* | |
102 | * Wait until the DMA transfer completes, then stop the DMA controller. | |
103 | */ | |
104 | static void pxa_bmdma_stop(struct ata_queued_cmd *qc) | |
105 | { | |
106 | struct pata_pxa_data *pd = qc->ap->private_data; | |
88622d80 | 107 | enum dma_status status; |
2dc6c6f1 | 108 | |
88622d80 RJ |
109 | status = dmaengine_tx_status(pd->dma_chan, pd->dma_cookie, NULL); |
110 | if (status != DMA_ERROR && status != DMA_COMPLETE && | |
111 | wait_for_completion_timeout(&pd->dma_done, HZ)) | |
112 | ata_dev_err(qc->dev, "Timeout waiting for DMA completion!"); | |
2dc6c6f1 | 113 | |
88622d80 | 114 | dmaengine_terminate_all(pd->dma_chan); |
2dc6c6f1 MV |
115 | } |
116 | ||
117 | /* | |
118 | * Read DMA status. The bmdma_stop() will take care of properly finishing the | |
119 | * DMA transfer so we always have DMA-complete interrupt here. | |
120 | */ | |
121 | static unsigned char pxa_bmdma_status(struct ata_port *ap) | |
122 | { | |
123 | struct pata_pxa_data *pd = ap->private_data; | |
124 | unsigned char ret = ATA_DMA_INTR; | |
88622d80 RJ |
125 | struct dma_tx_state state; |
126 | enum dma_status status; | |
2dc6c6f1 | 127 | |
88622d80 RJ |
128 | status = dmaengine_tx_status(pd->dma_chan, pd->dma_cookie, &state); |
129 | if (status != DMA_COMPLETE) | |
2dc6c6f1 MV |
130 | ret |= ATA_DMA_ERR; |
131 | ||
132 | return ret; | |
133 | } | |
134 | ||
135 | /* | |
136 | * No IRQ register present so we do nothing. | |
137 | */ | |
138 | static void pxa_irq_clear(struct ata_port *ap) | |
139 | { | |
140 | } | |
141 | ||
142 | /* | |
143 | * Check for ATAPI DMA. ATAPI DMA is unsupported by this driver. It's still | |
144 | * unclear why ATAPI has DMA issues. | |
145 | */ | |
146 | static int pxa_check_atapi_dma(struct ata_queued_cmd *qc) | |
147 | { | |
148 | return -EOPNOTSUPP; | |
149 | } | |
150 | ||
151 | static struct scsi_host_template pxa_ata_sht = { | |
152 | ATA_BMDMA_SHT(DRV_NAME), | |
153 | }; | |
154 | ||
155 | static struct ata_port_operations pxa_ata_port_ops = { | |
156 | .inherits = &ata_bmdma_port_ops, | |
157 | .cable_detect = ata_cable_40wire, | |
158 | ||
159 | .bmdma_setup = pxa_bmdma_setup, | |
160 | .bmdma_start = pxa_bmdma_start, | |
161 | .bmdma_stop = pxa_bmdma_stop, | |
162 | .bmdma_status = pxa_bmdma_status, | |
163 | ||
164 | .check_atapi_dma = pxa_check_atapi_dma, | |
165 | ||
166 | .sff_irq_clear = pxa_irq_clear, | |
167 | ||
168 | .qc_prep = pxa_qc_prep, | |
169 | }; | |
170 | ||
0ec24914 | 171 | static int pxa_ata_probe(struct platform_device *pdev) |
2dc6c6f1 MV |
172 | { |
173 | struct ata_host *host; | |
174 | struct ata_port *ap; | |
175 | struct pata_pxa_data *data; | |
176 | struct resource *cmd_res; | |
177 | struct resource *ctl_res; | |
178 | struct resource *dma_res; | |
179 | struct resource *irq_res; | |
61b8c345 | 180 | struct pata_pxa_pdata *pdata = dev_get_platdata(&pdev->dev); |
88622d80 | 181 | struct dma_slave_config config; |
2dc6c6f1 MV |
182 | int ret = 0; |
183 | ||
184 | /* | |
185 | * Resource validation, three resources are needed: | |
186 | * - CMD port base address | |
187 | * - CTL port base address | |
188 | * - DMA port base address | |
189 | * - IRQ pin | |
190 | */ | |
191 | if (pdev->num_resources != 4) { | |
192 | dev_err(&pdev->dev, "invalid number of resources\n"); | |
193 | return -EINVAL; | |
194 | } | |
195 | ||
196 | /* | |
197 | * CMD port base address | |
198 | */ | |
199 | cmd_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
200 | if (unlikely(cmd_res == NULL)) | |
201 | return -EINVAL; | |
202 | ||
203 | /* | |
204 | * CTL port base address | |
205 | */ | |
206 | ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
207 | if (unlikely(ctl_res == NULL)) | |
208 | return -EINVAL; | |
209 | ||
210 | /* | |
211 | * DMA port base address | |
212 | */ | |
213 | dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
214 | if (unlikely(dma_res == NULL)) | |
215 | return -EINVAL; | |
216 | ||
217 | /* | |
218 | * IRQ pin | |
219 | */ | |
220 | irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
221 | if (unlikely(irq_res == NULL)) | |
222 | return -EINVAL; | |
223 | ||
224 | /* | |
225 | * Allocate the host | |
226 | */ | |
227 | host = ata_host_alloc(&pdev->dev, 1); | |
228 | if (!host) | |
229 | return -ENOMEM; | |
230 | ||
231 | ap = host->ports[0]; | |
232 | ap->ops = &pxa_ata_port_ops; | |
233 | ap->pio_mask = ATA_PIO4; | |
234 | ap->mwdma_mask = ATA_MWDMA2; | |
2dc6c6f1 MV |
235 | |
236 | ap->ioaddr.cmd_addr = devm_ioremap(&pdev->dev, cmd_res->start, | |
237 | resource_size(cmd_res)); | |
238 | ap->ioaddr.ctl_addr = devm_ioremap(&pdev->dev, ctl_res->start, | |
239 | resource_size(ctl_res)); | |
240 | ap->ioaddr.bmdma_addr = devm_ioremap(&pdev->dev, dma_res->start, | |
241 | resource_size(dma_res)); | |
242 | ||
243 | /* | |
244 | * Adjust register offsets | |
245 | */ | |
246 | ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; | |
247 | ap->ioaddr.data_addr = ap->ioaddr.cmd_addr + | |
248 | (ATA_REG_DATA << pdata->reg_shift); | |
249 | ap->ioaddr.error_addr = ap->ioaddr.cmd_addr + | |
250 | (ATA_REG_ERR << pdata->reg_shift); | |
251 | ap->ioaddr.feature_addr = ap->ioaddr.cmd_addr + | |
252 | (ATA_REG_FEATURE << pdata->reg_shift); | |
253 | ap->ioaddr.nsect_addr = ap->ioaddr.cmd_addr + | |
254 | (ATA_REG_NSECT << pdata->reg_shift); | |
255 | ap->ioaddr.lbal_addr = ap->ioaddr.cmd_addr + | |
256 | (ATA_REG_LBAL << pdata->reg_shift); | |
257 | ap->ioaddr.lbam_addr = ap->ioaddr.cmd_addr + | |
258 | (ATA_REG_LBAM << pdata->reg_shift); | |
259 | ap->ioaddr.lbah_addr = ap->ioaddr.cmd_addr + | |
260 | (ATA_REG_LBAH << pdata->reg_shift); | |
261 | ap->ioaddr.device_addr = ap->ioaddr.cmd_addr + | |
262 | (ATA_REG_DEVICE << pdata->reg_shift); | |
263 | ap->ioaddr.status_addr = ap->ioaddr.cmd_addr + | |
264 | (ATA_REG_STATUS << pdata->reg_shift); | |
265 | ap->ioaddr.command_addr = ap->ioaddr.cmd_addr + | |
266 | (ATA_REG_CMD << pdata->reg_shift); | |
267 | ||
268 | /* | |
269 | * Allocate and load driver's internal data structure | |
270 | */ | |
271 | data = devm_kzalloc(&pdev->dev, sizeof(struct pata_pxa_data), | |
272 | GFP_KERNEL); | |
273 | if (!data) | |
274 | return -ENOMEM; | |
275 | ||
276 | ap->private_data = data; | |
2dc6c6f1 | 277 | |
88622d80 RJ |
278 | memset(&config, 0, sizeof(config)); |
279 | config.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
280 | config.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
281 | config.src_addr = dma_res->start; | |
282 | config.dst_addr = dma_res->start; | |
283 | config.src_maxburst = 32; | |
284 | config.dst_maxburst = 32; | |
2dc6c6f1 MV |
285 | |
286 | /* | |
287 | * Request the DMA channel | |
288 | */ | |
88622d80 | 289 | data->dma_chan = |
273340e8 | 290 | dma_request_slave_channel(&pdev->dev, "data"); |
88622d80 | 291 | if (!data->dma_chan) |
2dc6c6f1 | 292 | return -EBUSY; |
88622d80 RJ |
293 | ret = dmaengine_slave_config(data->dma_chan, &config); |
294 | if (ret < 0) { | |
295 | dev_err(&pdev->dev, "dma configuration failed: %d\n", ret); | |
296 | return ret; | |
297 | } | |
2dc6c6f1 MV |
298 | |
299 | /* | |
300 | * Activate the ATA host | |
301 | */ | |
302 | ret = ata_host_activate(host, irq_res->start, ata_sff_interrupt, | |
303 | pdata->irq_flags, &pxa_ata_sht); | |
304 | if (ret) | |
88622d80 | 305 | dma_release_channel(data->dma_chan); |
2dc6c6f1 MV |
306 | |
307 | return ret; | |
308 | } | |
309 | ||
0ec24914 | 310 | static int pxa_ata_remove(struct platform_device *pdev) |
2dc6c6f1 | 311 | { |
d89995db | 312 | struct ata_host *host = platform_get_drvdata(pdev); |
2dc6c6f1 MV |
313 | struct pata_pxa_data *data = host->ports[0]->private_data; |
314 | ||
88622d80 | 315 | dma_release_channel(data->dma_chan); |
2dc6c6f1 MV |
316 | |
317 | ata_host_detach(host); | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | static struct platform_driver pxa_ata_driver = { | |
323 | .probe = pxa_ata_probe, | |
0ec24914 | 324 | .remove = pxa_ata_remove, |
2dc6c6f1 MV |
325 | .driver = { |
326 | .name = DRV_NAME, | |
2dc6c6f1 MV |
327 | }, |
328 | }; | |
329 | ||
99c8ea3e | 330 | module_platform_driver(pxa_ata_driver); |
2dc6c6f1 MV |
331 | |
332 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); | |
333 | MODULE_DESCRIPTION("DMA-capable driver for PATA on PXA CPU"); | |
334 | MODULE_LICENSE("GPL"); | |
335 | MODULE_VERSION(DRV_VERSION); | |
336 | MODULE_ALIAS("platform:" DRV_NAME); |