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acaa7aa3 AV |
1 | /* |
2 | * Freescale LBC and UPM routines. | |
3 | * | |
3ab8f2a2 RZ |
4 | * Copyright © 2007-2008 MontaVista Software, Inc. |
5 | * Copyright © 2010 Freescale Semiconductor | |
acaa7aa3 AV |
6 | * |
7 | * Author: Anton Vorontsov <avorontsov@ru.mvista.com> | |
3ab8f2a2 RZ |
8 | * Author: Jack Lan <Jack.Lan@freescale.com> |
9 | * Author: Roy Zang <tie-fei.zang@freescale.com> | |
acaa7aa3 AV |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | */ | |
16 | ||
c0da99d5 AV |
17 | #include <linux/init.h> |
18 | #include <linux/module.h> | |
acaa7aa3 | 19 | #include <linux/kernel.h> |
c0da99d5 AV |
20 | #include <linux/compiler.h> |
21 | #include <linux/spinlock.h> | |
22 | #include <linux/types.h> | |
23 | #include <linux/io.h> | |
acaa7aa3 | 24 | #include <linux/of.h> |
3ab8f2a2 RZ |
25 | #include <linux/slab.h> |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/mod_devicetable.h> | |
c0da99d5 | 29 | #include <asm/prom.h> |
acaa7aa3 AV |
30 | #include <asm/fsl_lbc.h> |
31 | ||
c0da99d5 | 32 | static spinlock_t fsl_lbc_lock = __SPIN_LOCK_UNLOCKED(fsl_lbc_lock); |
3ab8f2a2 RZ |
33 | struct fsl_lbc_ctrl *fsl_lbc_ctrl_dev; |
34 | EXPORT_SYMBOL(fsl_lbc_ctrl_dev); | |
acaa7aa3 | 35 | |
0b824d2b LCB |
36 | /** |
37 | * fsl_lbc_addr - convert the base address | |
38 | * @addr_base: base address of the memory bank | |
39 | * | |
40 | * This function converts a base address of lbc into the right format for the | |
41 | * BR register. If the SOC has eLBC then it returns 32bit physical address | |
42 | * else it convers a 34bit local bus physical address to correct format of | |
43 | * 32bit address for BR register (Example: MPC8641). | |
44 | */ | |
45 | u32 fsl_lbc_addr(phys_addr_t addr_base) | |
46 | { | |
47 | struct device_node *np = fsl_lbc_ctrl_dev->dev->of_node; | |
48 | u32 addr = addr_base & 0xffff8000; | |
49 | ||
50 | if (of_device_is_compatible(np, "fsl,elbc")) | |
51 | return addr; | |
52 | ||
53 | return addr | ((addr_base & 0x300000000ull) >> 19); | |
54 | } | |
55 | EXPORT_SYMBOL(fsl_lbc_addr); | |
56 | ||
acaa7aa3 AV |
57 | /** |
58 | * fsl_lbc_find - find Localbus bank | |
59 | * @addr_base: base address of the memory bank | |
60 | * | |
61 | * This function walks LBC banks comparing "Base address" field of the BR | |
62 | * registers with the supplied addr_base argument. When bases match this | |
63 | * function returns bank number (starting with 0), otherwise it returns | |
64 | * appropriate errno value. | |
65 | */ | |
66 | int fsl_lbc_find(phys_addr_t addr_base) | |
67 | { | |
68 | int i; | |
3ab8f2a2 | 69 | struct fsl_lbc_regs __iomem *lbc; |
acaa7aa3 | 70 | |
3ab8f2a2 | 71 | if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs) |
acaa7aa3 AV |
72 | return -ENODEV; |
73 | ||
3ab8f2a2 RZ |
74 | lbc = fsl_lbc_ctrl_dev->regs; |
75 | for (i = 0; i < ARRAY_SIZE(lbc->bank); i++) { | |
76 | __be32 br = in_be32(&lbc->bank[i].br); | |
77 | __be32 or = in_be32(&lbc->bank[i].or); | |
acaa7aa3 | 78 | |
0b824d2b | 79 | if (br & BR_V && (br & or & BR_BA) == fsl_lbc_addr(addr_base)) |
acaa7aa3 AV |
80 | return i; |
81 | } | |
82 | ||
83 | return -ENOENT; | |
84 | } | |
85 | EXPORT_SYMBOL(fsl_lbc_find); | |
86 | ||
87 | /** | |
88 | * fsl_upm_find - find pre-programmed UPM via base address | |
89 | * @addr_base: base address of the memory bank controlled by the UPM | |
90 | * @upm: pointer to the allocated fsl_upm structure | |
91 | * | |
92 | * This function fills fsl_upm structure so you can use it with the rest of | |
93 | * UPM API. On success this function returns 0, otherwise it returns | |
94 | * appropriate errno value. | |
95 | */ | |
96 | int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm *upm) | |
97 | { | |
98 | int bank; | |
99 | __be32 br; | |
3ab8f2a2 | 100 | struct fsl_lbc_regs __iomem *lbc; |
acaa7aa3 AV |
101 | |
102 | bank = fsl_lbc_find(addr_base); | |
103 | if (bank < 0) | |
104 | return bank; | |
105 | ||
3ab8f2a2 RZ |
106 | if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs) |
107 | return -ENODEV; | |
108 | ||
109 | lbc = fsl_lbc_ctrl_dev->regs; | |
110 | br = in_be32(&lbc->bank[bank].br); | |
acaa7aa3 AV |
111 | |
112 | switch (br & BR_MSEL) { | |
113 | case BR_MS_UPMA: | |
3ab8f2a2 | 114 | upm->mxmr = &lbc->mamr; |
acaa7aa3 AV |
115 | break; |
116 | case BR_MS_UPMB: | |
3ab8f2a2 | 117 | upm->mxmr = &lbc->mbmr; |
acaa7aa3 AV |
118 | break; |
119 | case BR_MS_UPMC: | |
3ab8f2a2 | 120 | upm->mxmr = &lbc->mcmr; |
acaa7aa3 AV |
121 | break; |
122 | default: | |
123 | return -EINVAL; | |
124 | } | |
125 | ||
126 | switch (br & BR_PS) { | |
127 | case BR_PS_8: | |
128 | upm->width = 8; | |
129 | break; | |
130 | case BR_PS_16: | |
131 | upm->width = 16; | |
132 | break; | |
133 | case BR_PS_32: | |
134 | upm->width = 32; | |
135 | break; | |
136 | default: | |
137 | return -EINVAL; | |
138 | } | |
139 | ||
140 | return 0; | |
141 | } | |
142 | EXPORT_SYMBOL(fsl_upm_find); | |
c0da99d5 AV |
143 | |
144 | /** | |
145 | * fsl_upm_run_pattern - actually run an UPM pattern | |
146 | * @upm: pointer to the fsl_upm structure obtained via fsl_upm_find | |
147 | * @io_base: remapped pointer to where memory access should happen | |
148 | * @mar: MAR register content during pattern execution | |
149 | * | |
150 | * This function triggers dummy write to the memory specified by the io_base, | |
151 | * thus UPM pattern actually executed. Note that mar usage depends on the | |
152 | * pre-programmed AMX bits in the UPM RAM. | |
153 | */ | |
154 | int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base, u32 mar) | |
155 | { | |
156 | int ret = 0; | |
157 | unsigned long flags; | |
158 | ||
3ab8f2a2 RZ |
159 | if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs) |
160 | return -ENODEV; | |
161 | ||
c0da99d5 AV |
162 | spin_lock_irqsave(&fsl_lbc_lock, flags); |
163 | ||
3ab8f2a2 | 164 | out_be32(&fsl_lbc_ctrl_dev->regs->mar, mar); |
c0da99d5 AV |
165 | |
166 | switch (upm->width) { | |
167 | case 8: | |
168 | out_8(io_base, 0x0); | |
169 | break; | |
170 | case 16: | |
171 | out_be16(io_base, 0x0); | |
172 | break; | |
173 | case 32: | |
174 | out_be32(io_base, 0x0); | |
175 | break; | |
176 | default: | |
177 | ret = -EINVAL; | |
178 | break; | |
179 | } | |
180 | ||
181 | spin_unlock_irqrestore(&fsl_lbc_lock, flags); | |
182 | ||
183 | return ret; | |
184 | } | |
185 | EXPORT_SYMBOL(fsl_upm_run_pattern); | |
3ab8f2a2 RZ |
186 | |
187 | static int __devinit fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl) | |
188 | { | |
189 | struct fsl_lbc_regs __iomem *lbc = ctrl->regs; | |
190 | ||
191 | /* clear event registers */ | |
192 | setbits32(&lbc->ltesr, LTESR_CLEAR); | |
193 | out_be32(&lbc->lteatr, 0); | |
194 | out_be32(&lbc->ltear, 0); | |
195 | out_be32(&lbc->lteccr, LTECCR_CLEAR); | |
196 | out_be32(&lbc->ltedr, LTEDR_ENABLE); | |
197 | ||
198 | /* Enable interrupts for any detected events */ | |
199 | out_be32(&lbc->lteir, LTEIR_ENABLE); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | /* | |
205 | * NOTE: This interrupt is used to report localbus events of various kinds, | |
206 | * such as transaction errors on the chipselects. | |
207 | */ | |
208 | ||
209 | static irqreturn_t fsl_lbc_ctrl_irq(int irqno, void *data) | |
210 | { | |
211 | struct fsl_lbc_ctrl *ctrl = data; | |
212 | struct fsl_lbc_regs __iomem *lbc = ctrl->regs; | |
213 | u32 status; | |
214 | ||
215 | status = in_be32(&lbc->ltesr); | |
216 | if (!status) | |
217 | return IRQ_NONE; | |
218 | ||
219 | out_be32(&lbc->ltesr, LTESR_CLEAR); | |
220 | out_be32(&lbc->lteatr, 0); | |
221 | out_be32(&lbc->ltear, 0); | |
222 | ctrl->irq_status = status; | |
223 | ||
224 | if (status & LTESR_BM) | |
225 | dev_err(ctrl->dev, "Local bus monitor time-out: " | |
226 | "LTESR 0x%08X\n", status); | |
227 | if (status & LTESR_WP) | |
228 | dev_err(ctrl->dev, "Write protect error: " | |
229 | "LTESR 0x%08X\n", status); | |
230 | if (status & LTESR_ATMW) | |
231 | dev_err(ctrl->dev, "Atomic write error: " | |
232 | "LTESR 0x%08X\n", status); | |
233 | if (status & LTESR_ATMR) | |
234 | dev_err(ctrl->dev, "Atomic read error: " | |
235 | "LTESR 0x%08X\n", status); | |
236 | if (status & LTESR_CS) | |
237 | dev_err(ctrl->dev, "Chip select error: " | |
238 | "LTESR 0x%08X\n", status); | |
239 | if (status & LTESR_UPM) | |
240 | ; | |
241 | if (status & LTESR_FCT) { | |
242 | dev_err(ctrl->dev, "FCM command time-out: " | |
243 | "LTESR 0x%08X\n", status); | |
244 | smp_wmb(); | |
245 | wake_up(&ctrl->irq_wait); | |
246 | } | |
247 | if (status & LTESR_PAR) { | |
248 | dev_err(ctrl->dev, "Parity or Uncorrectable ECC error: " | |
249 | "LTESR 0x%08X\n", status); | |
250 | smp_wmb(); | |
251 | wake_up(&ctrl->irq_wait); | |
252 | } | |
253 | if (status & LTESR_CC) { | |
254 | smp_wmb(); | |
255 | wake_up(&ctrl->irq_wait); | |
256 | } | |
257 | if (status & ~LTESR_MASK) | |
258 | dev_err(ctrl->dev, "Unknown error: " | |
259 | "LTESR 0x%08X\n", status); | |
260 | return IRQ_HANDLED; | |
261 | } | |
262 | ||
263 | /* | |
264 | * fsl_lbc_ctrl_probe | |
265 | * | |
266 | * called by device layer when it finds a device matching | |
267 | * one our driver can handled. This code allocates all of | |
268 | * the resources needed for the controller only. The | |
269 | * resources for the NAND banks themselves are allocated | |
270 | * in the chip probe function. | |
271 | */ | |
272 | ||
273 | static int __devinit fsl_lbc_ctrl_probe(struct platform_device *dev) | |
274 | { | |
275 | int ret; | |
276 | ||
277 | if (!dev->dev.of_node) { | |
278 | dev_err(&dev->dev, "Device OF-Node is NULL"); | |
279 | return -EFAULT; | |
280 | } | |
281 | ||
282 | fsl_lbc_ctrl_dev = kzalloc(sizeof(*fsl_lbc_ctrl_dev), GFP_KERNEL); | |
283 | if (!fsl_lbc_ctrl_dev) | |
284 | return -ENOMEM; | |
285 | ||
286 | dev_set_drvdata(&dev->dev, fsl_lbc_ctrl_dev); | |
287 | ||
288 | spin_lock_init(&fsl_lbc_ctrl_dev->lock); | |
289 | init_waitqueue_head(&fsl_lbc_ctrl_dev->irq_wait); | |
290 | ||
291 | fsl_lbc_ctrl_dev->regs = of_iomap(dev->dev.of_node, 0); | |
292 | if (!fsl_lbc_ctrl_dev->regs) { | |
293 | dev_err(&dev->dev, "failed to get memory region\n"); | |
294 | ret = -ENODEV; | |
295 | goto err; | |
296 | } | |
297 | ||
298 | fsl_lbc_ctrl_dev->irq = irq_of_parse_and_map(dev->dev.of_node, 0); | |
299 | if (fsl_lbc_ctrl_dev->irq == NO_IRQ) { | |
300 | dev_err(&dev->dev, "failed to get irq resource\n"); | |
301 | ret = -ENODEV; | |
302 | goto err; | |
303 | } | |
304 | ||
305 | fsl_lbc_ctrl_dev->dev = &dev->dev; | |
306 | ||
307 | ret = fsl_lbc_ctrl_init(fsl_lbc_ctrl_dev); | |
308 | if (ret < 0) | |
309 | goto err; | |
310 | ||
311 | ret = request_irq(fsl_lbc_ctrl_dev->irq, fsl_lbc_ctrl_irq, 0, | |
312 | "fsl-lbc", fsl_lbc_ctrl_dev); | |
313 | if (ret != 0) { | |
314 | dev_err(&dev->dev, "failed to install irq (%d)\n", | |
315 | fsl_lbc_ctrl_dev->irq); | |
316 | ret = fsl_lbc_ctrl_dev->irq; | |
317 | goto err; | |
318 | } | |
319 | ||
320 | return 0; | |
321 | ||
322 | err: | |
323 | iounmap(fsl_lbc_ctrl_dev->regs); | |
324 | kfree(fsl_lbc_ctrl_dev); | |
325 | return ret; | |
326 | } | |
327 | ||
328 | static const struct of_device_id fsl_lbc_match[] = { | |
329 | { .compatible = "fsl,elbc", }, | |
330 | { .compatible = "fsl,pq3-localbus", }, | |
331 | { .compatible = "fsl,pq2-localbus", }, | |
332 | { .compatible = "fsl,pq2pro-localbus", }, | |
333 | {}, | |
334 | }; | |
335 | ||
336 | static struct platform_driver fsl_lbc_ctrl_driver = { | |
337 | .driver = { | |
338 | .name = "fsl-lbc", | |
339 | .of_match_table = fsl_lbc_match, | |
340 | }, | |
341 | .probe = fsl_lbc_ctrl_probe, | |
342 | }; | |
343 | ||
344 | static int __init fsl_lbc_init(void) | |
345 | { | |
346 | return platform_driver_register(&fsl_lbc_ctrl_driver); | |
347 | } | |
348 | module_init(fsl_lbc_init); |