]>
Commit | Line | Data |
---|---|---|
918d7b7c SM |
1 | /* |
2 | * PATA driver for AT91SAM9260 Static Memory Controller | |
3 | * with CompactFlash interface in True IDE mode | |
4 | * | |
5 | * Copyright (C) 2009 Matyukevich Sergey | |
6 | * | |
7 | * Based on: | |
8 | * * generic platform driver by Paul Mundt: drivers/ata/pata_platform.c | |
9 | * * pata_at32 driver by Kristoffer Nyborg Gregertsen | |
10 | * * at91_ide driver by Stanislaw Gruszka | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License version 2 | |
14 | * as published by the Free Software Foundation. | |
15 | * | |
16 | */ | |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/blkdev.h> | |
22 | #include <scsi/scsi_host.h> | |
23 | #include <linux/ata.h> | |
24 | #include <linux/clk.h> | |
25 | #include <linux/libata.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/ata_platform.h> | |
28 | ||
29 | #include <mach/at91sam9260_matrix.h> | |
30 | #include <mach/at91sam9_smc.h> | |
31 | #include <mach/at91sam9260.h> | |
32 | #include <mach/board.h> | |
33 | #include <mach/gpio.h> | |
34 | ||
35 | ||
36 | #define DRV_NAME "pata_at91" | |
37 | #define DRV_VERSION "0.1" | |
38 | ||
39 | #define CF_IDE_OFFSET 0x00c00000 | |
40 | #define CF_ALT_IDE_OFFSET 0x00e00000 | |
41 | #define CF_IDE_RES_SIZE 0x08 | |
42 | ||
43 | struct at91_ide_info { | |
44 | unsigned long mode; | |
45 | unsigned int cs; | |
46 | ||
47 | void __iomem *ide_addr; | |
48 | void __iomem *alt_addr; | |
49 | }; | |
50 | ||
51 | const struct ata_timing initial_timing = | |
52 | {XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0}; | |
53 | ||
54 | static unsigned int calc_mck_cycles(unsigned int ns, unsigned int mck_hz) | |
55 | { | |
56 | unsigned long mul; | |
57 | ||
58 | /* | |
59 | * cycles = x [nsec] * f [Hz] / 10^9 [ns in sec] = | |
60 | * x * (f / 1_000_000_000) = | |
61 | * x * ((f * 65536) / 1_000_000_000) / 65536 = | |
62 | * x * (((f / 10_000) * 65536) / 100_000) / 65536 = | |
63 | */ | |
64 | ||
65 | mul = (mck_hz / 10000) << 16; | |
66 | mul /= 100000; | |
67 | ||
68 | return (ns * mul + 65536) >> 16; /* rounding */ | |
69 | } | |
70 | ||
71 | static void set_smc_mode(struct at91_ide_info *info) | |
72 | { | |
73 | at91_sys_write(AT91_SMC_MODE(info->cs), info->mode); | |
74 | return; | |
75 | } | |
76 | ||
77 | static void set_smc_timing(struct device *dev, | |
78 | struct at91_ide_info *info, const struct ata_timing *ata) | |
79 | { | |
80 | int read_cycle, write_cycle, active, recover; | |
81 | int nrd_setup, nrd_pulse, nrd_recover; | |
82 | int nwe_setup, nwe_pulse; | |
83 | ||
84 | int ncs_write_setup, ncs_write_pulse; | |
85 | int ncs_read_setup, ncs_read_pulse; | |
86 | ||
87 | unsigned int mck_hz; | |
88 | struct clk *mck; | |
89 | ||
90 | read_cycle = ata->cyc8b; | |
91 | nrd_setup = ata->setup; | |
92 | nrd_pulse = ata->act8b; | |
93 | nrd_recover = ata->rec8b; | |
94 | ||
95 | mck = clk_get(NULL, "mck"); | |
96 | BUG_ON(IS_ERR(mck)); | |
97 | mck_hz = clk_get_rate(mck); | |
98 | ||
99 | read_cycle = calc_mck_cycles(read_cycle, mck_hz); | |
100 | nrd_setup = calc_mck_cycles(nrd_setup, mck_hz); | |
101 | nrd_pulse = calc_mck_cycles(nrd_pulse, mck_hz); | |
102 | nrd_recover = calc_mck_cycles(nrd_recover, mck_hz); | |
103 | ||
104 | clk_put(mck); | |
105 | ||
106 | active = nrd_setup + nrd_pulse; | |
107 | recover = read_cycle - active; | |
108 | ||
109 | /* Need at least two cycles recovery */ | |
110 | if (recover < 2) | |
111 | read_cycle = active + 2; | |
112 | ||
113 | /* (CS0, CS1, DIR, OE) <= (CFCE1, CFCE2, CFRNW, NCSX) timings */ | |
114 | ncs_read_setup = 1; | |
115 | ncs_read_pulse = read_cycle - 2; | |
116 | ||
117 | /* Write timings same as read timings */ | |
118 | write_cycle = read_cycle; | |
119 | nwe_setup = nrd_setup; | |
120 | nwe_pulse = nrd_pulse; | |
121 | ncs_write_setup = ncs_read_setup; | |
122 | ncs_write_pulse = ncs_read_pulse; | |
123 | ||
124 | dev_dbg(dev, "ATA timings: nrd_setup = %d nrd_pulse = %d nrd_cycle = %d\n", | |
125 | nrd_setup, nrd_pulse, read_cycle); | |
126 | dev_dbg(dev, "ATA timings: nwe_setup = %d nwe_pulse = %d nwe_cycle = %d\n", | |
127 | nwe_setup, nwe_pulse, write_cycle); | |
128 | dev_dbg(dev, "ATA timings: ncs_read_setup = %d ncs_read_pulse = %d\n", | |
129 | ncs_read_setup, ncs_read_pulse); | |
130 | dev_dbg(dev, "ATA timings: ncs_write_setup = %d ncs_write_pulse = %d\n", | |
131 | ncs_write_setup, ncs_write_pulse); | |
132 | ||
133 | at91_sys_write(AT91_SMC_SETUP(info->cs), | |
134 | AT91_SMC_NWESETUP_(nwe_setup) | | |
135 | AT91_SMC_NRDSETUP_(nrd_setup) | | |
136 | AT91_SMC_NCS_WRSETUP_(ncs_write_setup) | | |
137 | AT91_SMC_NCS_RDSETUP_(ncs_read_setup)); | |
138 | ||
139 | at91_sys_write(AT91_SMC_PULSE(info->cs), | |
140 | AT91_SMC_NWEPULSE_(nwe_pulse) | | |
141 | AT91_SMC_NRDPULSE_(nrd_pulse) | | |
142 | AT91_SMC_NCS_WRPULSE_(ncs_write_pulse) | | |
143 | AT91_SMC_NCS_RDPULSE_(ncs_read_pulse)); | |
144 | ||
145 | at91_sys_write(AT91_SMC_CYCLE(info->cs), | |
146 | AT91_SMC_NWECYCLE_(write_cycle) | | |
147 | AT91_SMC_NRDCYCLE_(read_cycle)); | |
148 | ||
149 | return; | |
150 | } | |
151 | ||
152 | static void pata_at91_set_piomode(struct ata_port *ap, struct ata_device *adev) | |
153 | { | |
154 | struct at91_ide_info *info = ap->host->private_data; | |
155 | struct ata_timing timing; | |
156 | int ret; | |
157 | ||
158 | /* Compute ATA timing and set it to SMC */ | |
159 | ret = ata_timing_compute(adev, adev->pio_mode, &timing, 1000, 0); | |
160 | if (ret) { | |
161 | dev_warn(ap->dev, "Failed to compute ATA timing %d, \ | |
162 | set PIO_0 timing\n", ret); | |
163 | set_smc_timing(ap->dev, info, &initial_timing); | |
164 | } else { | |
165 | set_smc_timing(ap->dev, info, &timing); | |
166 | } | |
167 | ||
168 | /* Setup SMC mode */ | |
169 | set_smc_mode(info); | |
170 | ||
171 | return; | |
172 | } | |
173 | ||
174 | static unsigned int pata_at91_data_xfer_noirq(struct ata_device *dev, | |
175 | unsigned char *buf, unsigned int buflen, int rw) | |
176 | { | |
177 | struct at91_ide_info *info = dev->link->ap->host->private_data; | |
178 | unsigned int consumed; | |
179 | unsigned long flags; | |
180 | unsigned int mode; | |
181 | ||
182 | local_irq_save(flags); | |
183 | mode = at91_sys_read(AT91_SMC_MODE(info->cs)); | |
184 | ||
185 | /* set 16bit mode before writing data */ | |
186 | at91_sys_write(AT91_SMC_MODE(info->cs), | |
187 | (mode & ~AT91_SMC_DBW) | AT91_SMC_DBW_16); | |
188 | ||
189 | consumed = ata_sff_data_xfer(dev, buf, buflen, rw); | |
190 | ||
191 | /* restore 8bit mode after data is written */ | |
192 | at91_sys_write(AT91_SMC_MODE(info->cs), | |
193 | (mode & ~AT91_SMC_DBW) | AT91_SMC_DBW_8); | |
194 | ||
195 | local_irq_restore(flags); | |
196 | return consumed; | |
197 | } | |
198 | ||
199 | static struct scsi_host_template pata_at91_sht = { | |
200 | ATA_PIO_SHT(DRV_NAME), | |
201 | }; | |
202 | ||
203 | static struct ata_port_operations pata_at91_port_ops = { | |
204 | .inherits = &ata_sff_port_ops, | |
205 | ||
206 | .sff_data_xfer = pata_at91_data_xfer_noirq, | |
207 | .set_piomode = pata_at91_set_piomode, | |
208 | .cable_detect = ata_cable_40wire, | |
209 | .port_start = ATA_OP_NULL, | |
210 | }; | |
211 | ||
212 | static int __devinit pata_at91_probe(struct platform_device *pdev) | |
213 | { | |
214 | struct at91_cf_data *board = pdev->dev.platform_data; | |
215 | struct device *dev = &pdev->dev; | |
216 | struct at91_ide_info *info; | |
217 | struct resource *mem_res; | |
218 | struct ata_host *host; | |
219 | struct ata_port *ap; | |
220 | int irq_flags = 0; | |
221 | int irq = 0; | |
222 | int ret; | |
223 | ||
224 | /* get platform resources: IO/CTL memories and irq/rst pins */ | |
225 | ||
226 | if (pdev->num_resources != 1) { | |
227 | dev_err(&pdev->dev, "invalid number of resources\n"); | |
228 | return -EINVAL; | |
229 | } | |
230 | ||
231 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
232 | ||
233 | if (!mem_res) { | |
234 | dev_err(dev, "failed to get mem resource\n"); | |
235 | return -EINVAL; | |
236 | } | |
237 | ||
238 | irq = board->irq_pin; | |
239 | ||
240 | /* init ata host */ | |
241 | ||
242 | host = ata_host_alloc(dev, 1); | |
243 | ||
244 | if (!host) | |
245 | return -ENOMEM; | |
246 | ||
247 | ap = host->ports[0]; | |
248 | ap->ops = &pata_at91_port_ops; | |
249 | ap->flags |= ATA_FLAG_SLAVE_POSS; | |
250 | ap->pio_mask = ATA_PIO4; | |
251 | ||
252 | if (!irq) { | |
253 | ap->flags |= ATA_FLAG_PIO_POLLING; | |
254 | ata_port_desc(ap, "no IRQ, using PIO polling"); | |
255 | } | |
256 | ||
257 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
258 | ||
259 | if (!info) { | |
260 | dev_err(dev, "failed to allocate memory for private data\n"); | |
261 | return -ENOMEM; | |
262 | } | |
263 | ||
264 | info->cs = board->chipselect; | |
265 | info->mode = AT91_SMC_READMODE | AT91_SMC_WRITEMODE | | |
266 | AT91_SMC_EXNWMODE_READY | AT91_SMC_BAT_SELECT | | |
267 | AT91_SMC_DBW_8 | AT91_SMC_TDF_(0); | |
268 | ||
269 | info->ide_addr = devm_ioremap(dev, | |
270 | mem_res->start + CF_IDE_OFFSET, CF_IDE_RES_SIZE); | |
271 | ||
272 | if (!info->ide_addr) { | |
273 | dev_err(dev, "failed to map IO base\n"); | |
274 | ret = -ENOMEM; | |
275 | goto err_ide_ioremap; | |
276 | } | |
277 | ||
278 | info->alt_addr = devm_ioremap(dev, | |
279 | mem_res->start + CF_ALT_IDE_OFFSET, CF_IDE_RES_SIZE); | |
280 | ||
281 | if (!info->alt_addr) { | |
282 | dev_err(dev, "failed to map CTL base\n"); | |
283 | ret = -ENOMEM; | |
284 | goto err_alt_ioremap; | |
285 | } | |
286 | ||
287 | ap->ioaddr.cmd_addr = info->ide_addr; | |
288 | ap->ioaddr.ctl_addr = info->alt_addr + 0x06; | |
289 | ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; | |
290 | ||
291 | ata_sff_std_ports(&ap->ioaddr); | |
292 | ||
293 | ata_port_desc(ap, "mmio cmd 0x%llx ctl 0x%llx", | |
294 | (unsigned long long)mem_res->start + CF_IDE_OFFSET, | |
295 | (unsigned long long)mem_res->start + CF_ALT_IDE_OFFSET); | |
296 | ||
297 | host->private_data = info; | |
298 | ||
299 | return ata_host_activate(host, irq ? gpio_to_irq(irq) : 0, | |
300 | irq ? ata_sff_interrupt : NULL, | |
301 | irq_flags, &pata_at91_sht); | |
302 | ||
303 | err_alt_ioremap: | |
304 | devm_iounmap(dev, info->ide_addr); | |
305 | ||
306 | err_ide_ioremap: | |
307 | kfree(info); | |
308 | ||
309 | return ret; | |
310 | } | |
311 | ||
312 | static int __devexit pata_at91_remove(struct platform_device *pdev) | |
313 | { | |
314 | struct ata_host *host = dev_get_drvdata(&pdev->dev); | |
315 | struct at91_ide_info *info = host->private_data; | |
316 | struct device *dev = &pdev->dev; | |
317 | ||
318 | if (!host) | |
319 | return 0; | |
320 | ||
321 | ata_host_detach(host); | |
322 | ||
323 | if (!info) | |
324 | return 0; | |
325 | ||
326 | devm_iounmap(dev, info->ide_addr); | |
327 | devm_iounmap(dev, info->alt_addr); | |
328 | ||
329 | kfree(info); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static struct platform_driver pata_at91_driver = { | |
334 | .probe = pata_at91_probe, | |
335 | .remove = __devexit_p(pata_at91_remove), | |
336 | .driver = { | |
337 | .name = DRV_NAME, | |
338 | .owner = THIS_MODULE, | |
339 | }, | |
340 | }; | |
341 | ||
342 | static int __init pata_at91_init(void) | |
343 | { | |
344 | return platform_driver_register(&pata_at91_driver); | |
345 | } | |
346 | ||
347 | static void __exit pata_at91_exit(void) | |
348 | { | |
349 | platform_driver_unregister(&pata_at91_driver); | |
350 | } | |
351 | ||
352 | ||
353 | module_init(pata_at91_init); | |
354 | module_exit(pata_at91_exit); | |
355 | ||
356 | ||
357 | MODULE_LICENSE("GPL"); | |
358 | MODULE_DESCRIPTION("Driver for CF in True IDE mode on AT91SAM9260 SoC"); | |
359 | MODULE_AUTHOR("Matyukevich Sergey"); | |
360 | MODULE_VERSION(DRV_VERSION); | |
361 |