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1 | /* |
2 | * Generic platform device PATA driver | |
3 | * | |
4 | * Copyright (C) 2006 Paul Mundt | |
5 | * | |
6 | * Based on pata_pcmcia: | |
7 | * | |
8 | * Copyright 2005-2006 Red Hat Inc <alan@redhat.com>, all rights reserved. | |
9 | * | |
10 | * This file is subject to the terms and conditions of the GNU General Public | |
11 | * License. See the file "COPYING" in the main directory of this archive | |
12 | * for more details. | |
13 | */ | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/blkdev.h> | |
18 | #include <scsi/scsi_host.h> | |
19 | #include <linux/ata.h> | |
20 | #include <linux/libata.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/pata_platform.h> | |
23 | ||
24 | #define DRV_NAME "pata_platform" | |
25 | #define DRV_VERSION "0.1.2" | |
26 | ||
27 | static int pio_mask = 1; | |
28 | ||
29 | /* | |
30 | * Provide our own set_mode() as we don't want to change anything that has | |
31 | * already been configured.. | |
32 | */ | |
33 | static void pata_platform_set_mode(struct ata_port *ap) | |
34 | { | |
35 | int i; | |
36 | ||
37 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
38 | struct ata_device *dev = &ap->device[i]; | |
39 | ||
40 | if (ata_dev_enabled(dev)) { | |
41 | /* We don't really care */ | |
42 | dev->pio_mode = dev->xfer_mode = XFER_PIO_0; | |
43 | dev->xfer_shift = ATA_SHIFT_PIO; | |
44 | dev->flags |= ATA_DFLAG_PIO; | |
45 | } | |
46 | } | |
47 | } | |
48 | ||
49 | static void pata_platform_host_stop(struct ata_host *host) | |
50 | { | |
51 | int i; | |
52 | ||
53 | /* | |
54 | * Unmap the bases for MMIO | |
55 | */ | |
56 | for (i = 0; i < host->n_ports; i++) { | |
57 | struct ata_port *ap = host->ports[i]; | |
58 | ||
59 | if (ap->flags & ATA_FLAG_MMIO) { | |
60 | iounmap((void __iomem *)ap->ioaddr.ctl_addr); | |
61 | iounmap((void __iomem *)ap->ioaddr.cmd_addr); | |
62 | } | |
63 | } | |
64 | } | |
65 | ||
66 | static struct scsi_host_template pata_platform_sht = { | |
67 | .module = THIS_MODULE, | |
68 | .name = DRV_NAME, | |
69 | .ioctl = ata_scsi_ioctl, | |
70 | .queuecommand = ata_scsi_queuecmd, | |
71 | .can_queue = ATA_DEF_QUEUE, | |
72 | .this_id = ATA_SHT_THIS_ID, | |
73 | .sg_tablesize = LIBATA_MAX_PRD, | |
74 | .max_sectors = ATA_MAX_SECTORS, | |
75 | .cmd_per_lun = ATA_SHT_CMD_PER_LUN, | |
76 | .emulated = ATA_SHT_EMULATED, | |
77 | .use_clustering = ATA_SHT_USE_CLUSTERING, | |
78 | .proc_name = DRV_NAME, | |
79 | .dma_boundary = ATA_DMA_BOUNDARY, | |
80 | .slave_configure = ata_scsi_slave_config, | |
81 | .bios_param = ata_std_bios_param, | |
82 | }; | |
83 | ||
84 | static struct ata_port_operations pata_platform_port_ops = { | |
85 | .set_mode = pata_platform_set_mode, | |
86 | ||
87 | .port_disable = ata_port_disable, | |
88 | .tf_load = ata_tf_load, | |
89 | .tf_read = ata_tf_read, | |
90 | .check_status = ata_check_status, | |
91 | .exec_command = ata_exec_command, | |
92 | .dev_select = ata_std_dev_select, | |
93 | ||
94 | .freeze = ata_bmdma_freeze, | |
95 | .thaw = ata_bmdma_thaw, | |
96 | .error_handler = ata_bmdma_error_handler, | |
97 | .post_internal_cmd = ata_bmdma_post_internal_cmd, | |
98 | ||
99 | .qc_prep = ata_qc_prep, | |
100 | .qc_issue = ata_qc_issue_prot, | |
101 | ||
102 | .data_xfer = ata_pio_data_xfer_noirq, | |
103 | ||
104 | .irq_handler = ata_interrupt, | |
105 | .irq_clear = ata_bmdma_irq_clear, | |
106 | ||
107 | .port_start = ata_port_start, | |
108 | .port_stop = ata_port_stop, | |
109 | .host_stop = pata_platform_host_stop | |
110 | }; | |
111 | ||
112 | static void pata_platform_setup_port(struct ata_ioports *ioaddr, | |
113 | struct pata_platform_info *info) | |
114 | { | |
115 | unsigned int shift = 0; | |
116 | ||
117 | /* Fixup the port shift for platforms that need it */ | |
118 | if (info && info->ioport_shift) | |
119 | shift = info->ioport_shift; | |
120 | ||
121 | ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); | |
122 | ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); | |
123 | ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); | |
124 | ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); | |
125 | ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); | |
126 | ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); | |
127 | ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); | |
128 | ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); | |
129 | ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); | |
130 | ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); | |
131 | } | |
132 | ||
133 | /** | |
134 | * pata_platform_probe - attach a platform interface | |
135 | * @pdev: platform device | |
136 | * | |
137 | * Register a platform bus IDE interface. Such interfaces are PIO and we | |
138 | * assume do not support IRQ sharing. | |
139 | * | |
140 | * Platform devices are expected to contain 3 resources per port: | |
141 | * | |
142 | * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) | |
143 | * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) | |
144 | * - IRQ (IORESOURCE_IRQ) | |
145 | * | |
146 | * If the base resources are both mem types, the ioremap() is handled | |
147 | * here. For IORESOURCE_IO, it's assumed that there's no remapping | |
148 | * necessary. | |
149 | */ | |
150 | static int __devinit pata_platform_probe(struct platform_device *pdev) | |
151 | { | |
152 | struct resource *io_res, *ctl_res; | |
153 | struct ata_probe_ent ae; | |
154 | unsigned int mmio; | |
155 | int ret; | |
156 | ||
157 | /* | |
158 | * Simple resource validation .. | |
159 | */ | |
160 | if (unlikely(pdev->num_resources != 3)) { | |
161 | dev_err(&pdev->dev, "invalid number of resources\n"); | |
162 | return -EINVAL; | |
163 | } | |
164 | ||
165 | /* | |
166 | * Get the I/O base first | |
167 | */ | |
168 | io_res = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
169 | if (io_res == NULL) { | |
170 | io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
171 | if (unlikely(io_res == NULL)) | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Then the CTL base | |
177 | */ | |
178 | ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); | |
179 | if (ctl_res == NULL) { | |
180 | ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
181 | if (unlikely(ctl_res == NULL)) | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
185 | /* | |
186 | * Check for MMIO | |
187 | */ | |
188 | mmio = (( io_res->flags == IORESOURCE_MEM) && | |
189 | (ctl_res->flags == IORESOURCE_MEM)); | |
190 | ||
191 | /* | |
192 | * Now that that's out of the way, wire up the port.. | |
193 | */ | |
194 | memset(&ae, 0, sizeof(struct ata_probe_ent)); | |
195 | INIT_LIST_HEAD(&ae.node); | |
196 | ae.dev = &pdev->dev; | |
197 | ae.port_ops = &pata_platform_port_ops; | |
198 | ae.sht = &pata_platform_sht; | |
199 | ae.n_ports = 1; | |
200 | ae.pio_mask = pio_mask; | |
201 | ae.irq = platform_get_irq(pdev, 0); | |
202 | ae.irq_flags = 0; | |
203 | ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST; | |
204 | ||
205 | /* | |
206 | * Handle the MMIO case | |
207 | */ | |
208 | if (mmio) { | |
209 | ae.port_flags |= ATA_FLAG_MMIO; | |
210 | ||
211 | ae.port[0].cmd_addr = (unsigned long)ioremap(io_res->start, | |
212 | io_res->end - io_res->start + 1); | |
213 | if (unlikely(!ae.port[0].cmd_addr)) { | |
214 | dev_err(&pdev->dev, "failed to remap IO base\n"); | |
215 | return -ENXIO; | |
216 | } | |
217 | ||
218 | ae.port[0].ctl_addr = (unsigned long)ioremap(ctl_res->start, | |
219 | ctl_res->end - ctl_res->start + 1); | |
220 | if (unlikely(!ae.port[0].ctl_addr)) { | |
221 | dev_err(&pdev->dev, "failed to remap CTL base\n"); | |
222 | ret = -ENXIO; | |
223 | goto bad_remap; | |
224 | } | |
225 | } else { | |
226 | ae.port[0].cmd_addr = io_res->start; | |
227 | ae.port[0].ctl_addr = ctl_res->start; | |
228 | } | |
229 | ||
230 | ae.port[0].altstatus_addr = ae.port[0].ctl_addr; | |
231 | ||
232 | pata_platform_setup_port(&ae.port[0], pdev->dev.platform_data); | |
233 | ||
234 | if (unlikely(ata_device_add(&ae) == 0)) { | |
235 | ret = -ENODEV; | |
236 | goto add_failed; | |
237 | } | |
238 | ||
239 | return 0; | |
240 | ||
241 | add_failed: | |
242 | if (ae.port[0].ctl_addr && mmio) | |
243 | iounmap((void __iomem *)ae.port[0].ctl_addr); | |
244 | bad_remap: | |
245 | if (ae.port[0].cmd_addr && mmio) | |
246 | iounmap((void __iomem *)ae.port[0].cmd_addr); | |
247 | ||
248 | return ret; | |
249 | } | |
250 | ||
251 | /** | |
252 | * pata_platform_remove - unplug a platform interface | |
253 | * @pdev: platform device | |
254 | * | |
255 | * A platform bus ATA device has been unplugged. Perform the needed | |
256 | * cleanup. Also called on module unload for any active devices. | |
257 | */ | |
258 | static int __devexit pata_platform_remove(struct platform_device *pdev) | |
259 | { | |
260 | struct device *dev = &pdev->dev; | |
261 | struct ata_host *host = dev_get_drvdata(dev); | |
262 | ||
263 | ata_host_remove(host); | |
264 | dev_set_drvdata(dev, NULL); | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static struct platform_driver pata_platform_driver = { | |
270 | .probe = pata_platform_probe, | |
271 | .remove = __devexit_p(pata_platform_remove), | |
272 | .driver = { | |
273 | .name = DRV_NAME, | |
274 | .owner = THIS_MODULE, | |
275 | }, | |
276 | }; | |
277 | ||
278 | static int __init pata_platform_init(void) | |
279 | { | |
280 | return platform_driver_register(&pata_platform_driver); | |
281 | } | |
282 | ||
283 | static void __exit pata_platform_exit(void) | |
284 | { | |
285 | platform_driver_unregister(&pata_platform_driver); | |
286 | } | |
287 | module_init(pata_platform_init); | |
288 | module_exit(pata_platform_exit); | |
289 | ||
290 | module_param(pio_mask, int, 0); | |
291 | ||
292 | MODULE_AUTHOR("Paul Mundt"); | |
293 | MODULE_DESCRIPTION("low-level driver for platform device ATA"); | |
294 | MODULE_LICENSE("GPL"); | |
295 | MODULE_VERSION(DRV_VERSION); |