blob: 23ef0917483cadb2c2380795d70c2714aae0ce76 [file] [log] [blame]
Thor Thayer71bcada2014-09-03 10:27:54 -05001/*
Thor Thayer143f4a52015-06-04 09:28:46 -05002 * Copyright Altera Corporation (C) 2014-2015. All rights reserved.
Thor Thayer71bcada2014-09-03 10:27:54 -05003 * Copyright 2011-2012 Calxeda, Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 *
17 * Adapted from the highbank_mc_edac driver.
18 */
19
20#include <linux/ctype.h>
21#include <linux/edac.h>
22#include <linux/interrupt.h>
23#include <linux/kernel.h>
24#include <linux/mfd/syscon.h>
25#include <linux/of_platform.h>
26#include <linux/platform_device.h>
27#include <linux/regmap.h>
28#include <linux/types.h>
29#include <linux/uaccess.h>
30
Thor Thayer143f4a52015-06-04 09:28:46 -050031#include "altera_edac.h"
Thor Thayer71bcada2014-09-03 10:27:54 -050032#include "edac_core.h"
33#include "edac_module.h"
34
35#define EDAC_MOD_STR "altera_edac"
36#define EDAC_VERSION "1"
37
Thor Thayer143f4a52015-06-04 09:28:46 -050038static const struct altr_sdram_prv_data c5_data = {
39 .ecc_ctrl_offset = CV_CTLCFG_OFST,
40 .ecc_ctl_en_mask = CV_CTLCFG_ECC_AUTO_EN,
41 .ecc_stat_offset = CV_DRAMSTS_OFST,
42 .ecc_stat_ce_mask = CV_DRAMSTS_SBEERR,
43 .ecc_stat_ue_mask = CV_DRAMSTS_DBEERR,
44 .ecc_saddr_offset = CV_ERRADDR_OFST,
Thor Thayer73bcc942015-06-04 09:28:47 -050045 .ecc_daddr_offset = CV_ERRADDR_OFST,
Thor Thayer143f4a52015-06-04 09:28:46 -050046 .ecc_cecnt_offset = CV_SBECOUNT_OFST,
47 .ecc_uecnt_offset = CV_DBECOUNT_OFST,
48 .ecc_irq_en_offset = CV_DRAMINTR_OFST,
49 .ecc_irq_en_mask = CV_DRAMINTR_INTREN,
50 .ecc_irq_clr_offset = CV_DRAMINTR_OFST,
51 .ecc_irq_clr_mask = (CV_DRAMINTR_INTRCLR | CV_DRAMINTR_INTREN),
52 .ecc_cnt_rst_offset = CV_DRAMINTR_OFST,
53 .ecc_cnt_rst_mask = CV_DRAMINTR_INTRCLR,
54#ifdef CONFIG_EDAC_DEBUG
55 .ce_ue_trgr_offset = CV_CTLCFG_OFST,
56 .ce_set_mask = CV_CTLCFG_GEN_SB_ERR,
57 .ue_set_mask = CV_CTLCFG_GEN_DB_ERR,
58#endif
Thor Thayer71bcada2014-09-03 10:27:54 -050059};
60
Thor Thayer73bcc942015-06-04 09:28:47 -050061static const struct altr_sdram_prv_data a10_data = {
62 .ecc_ctrl_offset = A10_ECCCTRL1_OFST,
63 .ecc_ctl_en_mask = A10_ECCCTRL1_ECC_EN,
64 .ecc_stat_offset = A10_INTSTAT_OFST,
65 .ecc_stat_ce_mask = A10_INTSTAT_SBEERR,
66 .ecc_stat_ue_mask = A10_INTSTAT_DBEERR,
67 .ecc_saddr_offset = A10_SERRADDR_OFST,
68 .ecc_daddr_offset = A10_DERRADDR_OFST,
69 .ecc_irq_en_offset = A10_ERRINTEN_OFST,
70 .ecc_irq_en_mask = A10_ECC_IRQ_EN_MASK,
71 .ecc_irq_clr_offset = A10_INTSTAT_OFST,
72 .ecc_irq_clr_mask = (A10_INTSTAT_SBEERR | A10_INTSTAT_DBEERR),
73 .ecc_cnt_rst_offset = A10_ECCCTRL1_OFST,
74 .ecc_cnt_rst_mask = A10_ECC_CNT_RESET_MASK,
75#ifdef CONFIG_EDAC_DEBUG
76 .ce_ue_trgr_offset = A10_DIAGINTTEST_OFST,
77 .ce_set_mask = A10_DIAGINT_TSERRA_MASK,
78 .ue_set_mask = A10_DIAGINT_TDERRA_MASK,
79#endif
80};
81
Thor Thayer71bcada2014-09-03 10:27:54 -050082static irqreturn_t altr_sdram_mc_err_handler(int irq, void *dev_id)
83{
84 struct mem_ctl_info *mci = dev_id;
85 struct altr_sdram_mc_data *drvdata = mci->pvt_info;
Thor Thayer143f4a52015-06-04 09:28:46 -050086 const struct altr_sdram_prv_data *priv = drvdata->data;
Thor Thayer73bcc942015-06-04 09:28:47 -050087 u32 status, err_count = 1, err_addr;
Thor Thayer71bcada2014-09-03 10:27:54 -050088
Thor Thayer143f4a52015-06-04 09:28:46 -050089 regmap_read(drvdata->mc_vbase, priv->ecc_stat_offset, &status);
Thor Thayer71bcada2014-09-03 10:27:54 -050090
Thor Thayer143f4a52015-06-04 09:28:46 -050091 if (status & priv->ecc_stat_ue_mask) {
Thor Thayer73bcc942015-06-04 09:28:47 -050092 regmap_read(drvdata->mc_vbase, priv->ecc_daddr_offset,
93 &err_addr);
94 if (priv->ecc_uecnt_offset)
95 regmap_read(drvdata->mc_vbase, priv->ecc_uecnt_offset,
96 &err_count);
Thor Thayer71bcada2014-09-03 10:27:54 -050097 panic("\nEDAC: [%d Uncorrectable errors @ 0x%08X]\n",
98 err_count, err_addr);
99 }
Thor Thayer143f4a52015-06-04 09:28:46 -0500100 if (status & priv->ecc_stat_ce_mask) {
Thor Thayer73bcc942015-06-04 09:28:47 -0500101 regmap_read(drvdata->mc_vbase, priv->ecc_saddr_offset,
102 &err_addr);
103 if (priv->ecc_uecnt_offset)
104 regmap_read(drvdata->mc_vbase, priv->ecc_cecnt_offset,
105 &err_count);
Thor Thayer71bcada2014-09-03 10:27:54 -0500106 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, err_count,
107 err_addr >> PAGE_SHIFT,
108 err_addr & ~PAGE_MASK, 0,
109 0, 0, -1, mci->ctl_name, "");
Thor Thayer73bcc942015-06-04 09:28:47 -0500110 /* Clear IRQ to resume */
111 regmap_write(drvdata->mc_vbase, priv->ecc_irq_clr_offset,
112 priv->ecc_irq_clr_mask);
113
114 return IRQ_HANDLED;
Thor Thayer71bcada2014-09-03 10:27:54 -0500115 }
Thor Thayer73bcc942015-06-04 09:28:47 -0500116 return IRQ_NONE;
Thor Thayer71bcada2014-09-03 10:27:54 -0500117}
118
119#ifdef CONFIG_EDAC_DEBUG
120static ssize_t altr_sdr_mc_err_inject_write(struct file *file,
121 const char __user *data,
122 size_t count, loff_t *ppos)
123{
124 struct mem_ctl_info *mci = file->private_data;
125 struct altr_sdram_mc_data *drvdata = mci->pvt_info;
Thor Thayer143f4a52015-06-04 09:28:46 -0500126 const struct altr_sdram_prv_data *priv = drvdata->data;
Thor Thayer71bcada2014-09-03 10:27:54 -0500127 u32 *ptemp;
128 dma_addr_t dma_handle;
129 u32 reg, read_reg;
130
131 ptemp = dma_alloc_coherent(mci->pdev, 16, &dma_handle, GFP_KERNEL);
132 if (!ptemp) {
133 dma_free_coherent(mci->pdev, 16, ptemp, dma_handle);
134 edac_printk(KERN_ERR, EDAC_MC,
135 "Inject: Buffer Allocation error\n");
136 return -ENOMEM;
137 }
138
Thor Thayer143f4a52015-06-04 09:28:46 -0500139 regmap_read(drvdata->mc_vbase, priv->ce_ue_trgr_offset,
140 &read_reg);
141 read_reg &= ~(priv->ce_set_mask | priv->ue_set_mask);
Thor Thayer71bcada2014-09-03 10:27:54 -0500142
143 /* Error are injected by writing a word while the SBE or DBE
144 * bit in the CTLCFG register is set. Reading the word will
145 * trigger the SBE or DBE error and the corresponding IRQ.
146 */
147 if (count == 3) {
148 edac_printk(KERN_ALERT, EDAC_MC,
149 "Inject Double bit error\n");
Thor Thayer143f4a52015-06-04 09:28:46 -0500150 regmap_write(drvdata->mc_vbase, priv->ce_ue_trgr_offset,
151 (read_reg | priv->ue_set_mask));
Thor Thayer71bcada2014-09-03 10:27:54 -0500152 } else {
153 edac_printk(KERN_ALERT, EDAC_MC,
154 "Inject Single bit error\n");
Thor Thayer143f4a52015-06-04 09:28:46 -0500155 regmap_write(drvdata->mc_vbase, priv->ce_ue_trgr_offset,
156 (read_reg | priv->ce_set_mask));
Thor Thayer71bcada2014-09-03 10:27:54 -0500157 }
158
159 ptemp[0] = 0x5A5A5A5A;
160 ptemp[1] = 0xA5A5A5A5;
161
162 /* Clear the error injection bits */
Thor Thayer143f4a52015-06-04 09:28:46 -0500163 regmap_write(drvdata->mc_vbase, priv->ce_ue_trgr_offset, read_reg);
Thor Thayer71bcada2014-09-03 10:27:54 -0500164 /* Ensure it has been written out */
165 wmb();
166
167 /*
168 * To trigger the error, we need to read the data back
169 * (the data was written with errors above).
170 * The ACCESS_ONCE macros and printk are used to prevent the
171 * the compiler optimizing these reads out.
172 */
173 reg = ACCESS_ONCE(ptemp[0]);
174 read_reg = ACCESS_ONCE(ptemp[1]);
175 /* Force Read */
176 rmb();
177
178 edac_printk(KERN_ALERT, EDAC_MC, "Read Data [0x%X, 0x%X]\n",
179 reg, read_reg);
180
181 dma_free_coherent(mci->pdev, 16, ptemp, dma_handle);
182
183 return count;
184}
185
186static const struct file_operations altr_sdr_mc_debug_inject_fops = {
187 .open = simple_open,
188 .write = altr_sdr_mc_err_inject_write,
189 .llseek = generic_file_llseek,
190};
191
192static void altr_sdr_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
193{
194 if (mci->debugfs)
195 debugfs_create_file("inject_ctrl", S_IWUSR, mci->debugfs, mci,
196 &altr_sdr_mc_debug_inject_fops);
197}
198#else
199static void altr_sdr_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
200{}
201#endif
202
Thor Thayerf9ae4872015-06-04 09:28:45 -0500203/* Get total memory size from Open Firmware DTB */
204static unsigned long get_total_mem(void)
Thor Thayer71bcada2014-09-03 10:27:54 -0500205{
Thor Thayerf9ae4872015-06-04 09:28:45 -0500206 struct device_node *np = NULL;
207 const unsigned int *reg, *reg_end;
208 int len, sw, aw;
209 unsigned long start, size, total_mem = 0;
Thor Thayer71bcada2014-09-03 10:27:54 -0500210
Thor Thayerf9ae4872015-06-04 09:28:45 -0500211 for_each_node_by_type(np, "memory") {
212 aw = of_n_addr_cells(np);
213 sw = of_n_size_cells(np);
214 reg = (const unsigned int *)of_get_property(np, "reg", &len);
215 reg_end = reg + (len / sizeof(u32));
Thor Thayer71bcada2014-09-03 10:27:54 -0500216
Thor Thayerf9ae4872015-06-04 09:28:45 -0500217 total_mem = 0;
218 do {
219 start = of_read_number(reg, aw);
220 reg += aw;
221 size = of_read_number(reg, sw);
222 reg += sw;
223 total_mem += size;
224 } while (reg < reg_end);
225 }
226 edac_dbg(0, "total_mem 0x%lx\n", total_mem);
227 return total_mem;
Thor Thayer71bcada2014-09-03 10:27:54 -0500228}
229
Thor Thayer143f4a52015-06-04 09:28:46 -0500230static const struct of_device_id altr_sdram_ctrl_of_match[] = {
231 { .compatible = "altr,sdram-edac", .data = (void *)&c5_data},
Thor Thayer73bcc942015-06-04 09:28:47 -0500232 { .compatible = "altr,sdram-edac-a10", .data = (void *)&a10_data},
Thor Thayer143f4a52015-06-04 09:28:46 -0500233 {},
234};
235MODULE_DEVICE_TABLE(of, altr_sdram_ctrl_of_match);
236
Thor Thayer73bcc942015-06-04 09:28:47 -0500237static int a10_init(struct regmap *mc_vbase)
238{
239 if (regmap_update_bits(mc_vbase, A10_INTMODE_OFST,
240 A10_INTMODE_SB_INT, A10_INTMODE_SB_INT)) {
241 edac_printk(KERN_ERR, EDAC_MC,
242 "Error setting SB IRQ mode\n");
243 return -ENODEV;
244 }
245
246 if (regmap_write(mc_vbase, A10_SERRCNTREG_OFST, 1)) {
247 edac_printk(KERN_ERR, EDAC_MC,
248 "Error setting trigger count\n");
249 return -ENODEV;
250 }
251
252 return 0;
253}
254
255static int a10_unmask_irq(struct platform_device *pdev, u32 mask)
256{
257 void __iomem *sm_base;
258 int ret = 0;
259
260 if (!request_mem_region(A10_SYMAN_INTMASK_CLR, sizeof(u32),
261 dev_name(&pdev->dev))) {
262 edac_printk(KERN_ERR, EDAC_MC,
263 "Unable to request mem region\n");
264 return -EBUSY;
265 }
266
267 sm_base = ioremap(A10_SYMAN_INTMASK_CLR, sizeof(u32));
268 if (!sm_base) {
269 edac_printk(KERN_ERR, EDAC_MC,
270 "Unable to ioremap device\n");
271
272 ret = -ENOMEM;
273 goto release;
274 }
275
276 iowrite32(mask, sm_base);
277
278 iounmap(sm_base);
279
280release:
281 release_mem_region(A10_SYMAN_INTMASK_CLR, sizeof(u32));
282
283 return ret;
284}
285
Thor Thayer71bcada2014-09-03 10:27:54 -0500286static int altr_sdram_probe(struct platform_device *pdev)
287{
Thor Thayer143f4a52015-06-04 09:28:46 -0500288 const struct of_device_id *id;
Thor Thayer71bcada2014-09-03 10:27:54 -0500289 struct edac_mc_layer layers[2];
290 struct mem_ctl_info *mci;
291 struct altr_sdram_mc_data *drvdata;
Thor Thayer143f4a52015-06-04 09:28:46 -0500292 const struct altr_sdram_prv_data *priv;
Thor Thayer71bcada2014-09-03 10:27:54 -0500293 struct regmap *mc_vbase;
294 struct dimm_info *dimm;
Thor Thayer143f4a52015-06-04 09:28:46 -0500295 u32 read_reg;
Thor Thayer73bcc942015-06-04 09:28:47 -0500296 int irq, irq2, res = 0;
297 unsigned long mem_size, irqflags = 0;
Thor Thayer71bcada2014-09-03 10:27:54 -0500298
Thor Thayer143f4a52015-06-04 09:28:46 -0500299 id = of_match_device(altr_sdram_ctrl_of_match, &pdev->dev);
300 if (!id)
301 return -ENODEV;
302
Thor Thayer71bcada2014-09-03 10:27:54 -0500303 /* Grab the register range from the sdr controller in device tree */
304 mc_vbase = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
305 "altr,sdr-syscon");
306 if (IS_ERR(mc_vbase)) {
307 edac_printk(KERN_ERR, EDAC_MC,
308 "regmap for altr,sdr-syscon lookup failed.\n");
309 return -ENODEV;
310 }
311
Thor Thayer143f4a52015-06-04 09:28:46 -0500312 /* Check specific dependencies for the module */
313 priv = of_match_node(altr_sdram_ctrl_of_match,
314 pdev->dev.of_node)->data;
315
316 /* Validate the SDRAM controller has ECC enabled */
317 if (regmap_read(mc_vbase, priv->ecc_ctrl_offset, &read_reg) ||
318 ((read_reg & priv->ecc_ctl_en_mask) != priv->ecc_ctl_en_mask)) {
Thor Thayer71bcada2014-09-03 10:27:54 -0500319 edac_printk(KERN_ERR, EDAC_MC,
320 "No ECC/ECC disabled [0x%08X]\n", read_reg);
321 return -ENODEV;
322 }
323
324 /* Grab memory size from device tree. */
Thor Thayerf9ae4872015-06-04 09:28:45 -0500325 mem_size = get_total_mem();
Thor Thayer71bcada2014-09-03 10:27:54 -0500326 if (!mem_size) {
Thor Thayerf9ae4872015-06-04 09:28:45 -0500327 edac_printk(KERN_ERR, EDAC_MC, "Unable to calculate memory size\n");
Thor Thayer71bcada2014-09-03 10:27:54 -0500328 return -ENODEV;
329 }
330
Thor Thayer143f4a52015-06-04 09:28:46 -0500331 /* Ensure the SDRAM Interrupt is disabled */
332 if (regmap_update_bits(mc_vbase, priv->ecc_irq_en_offset,
333 priv->ecc_irq_en_mask, 0)) {
Thor Thayer71bcada2014-09-03 10:27:54 -0500334 edac_printk(KERN_ERR, EDAC_MC,
Thor Thayer143f4a52015-06-04 09:28:46 -0500335 "Error disabling SDRAM ECC IRQ\n");
336 return -ENODEV;
337 }
338
339 /* Toggle to clear the SDRAM Error count */
340 if (regmap_update_bits(mc_vbase, priv->ecc_cnt_rst_offset,
341 priv->ecc_cnt_rst_mask,
342 priv->ecc_cnt_rst_mask)) {
343 edac_printk(KERN_ERR, EDAC_MC,
344 "Error clearing SDRAM ECC count\n");
345 return -ENODEV;
346 }
347
348 if (regmap_update_bits(mc_vbase, priv->ecc_cnt_rst_offset,
349 priv->ecc_cnt_rst_mask, 0)) {
350 edac_printk(KERN_ERR, EDAC_MC,
351 "Error clearing SDRAM ECC count\n");
Thor Thayer71bcada2014-09-03 10:27:54 -0500352 return -ENODEV;
353 }
354
355 irq = platform_get_irq(pdev, 0);
356 if (irq < 0) {
357 edac_printk(KERN_ERR, EDAC_MC,
358 "No irq %d in DT\n", irq);
359 return -ENODEV;
360 }
361
Thor Thayer73bcc942015-06-04 09:28:47 -0500362 /* Arria10 has a 2nd IRQ */
363 irq2 = platform_get_irq(pdev, 1);
364
Thor Thayer71bcada2014-09-03 10:27:54 -0500365 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
366 layers[0].size = 1;
367 layers[0].is_virt_csrow = true;
368 layers[1].type = EDAC_MC_LAYER_CHANNEL;
369 layers[1].size = 1;
370 layers[1].is_virt_csrow = false;
371 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
372 sizeof(struct altr_sdram_mc_data));
373 if (!mci)
374 return -ENOMEM;
375
376 mci->pdev = &pdev->dev;
377 drvdata = mci->pvt_info;
378 drvdata->mc_vbase = mc_vbase;
Thor Thayer143f4a52015-06-04 09:28:46 -0500379 drvdata->data = priv;
Thor Thayer71bcada2014-09-03 10:27:54 -0500380 platform_set_drvdata(pdev, mci);
381
382 if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
Thor Thayer143f4a52015-06-04 09:28:46 -0500383 edac_printk(KERN_ERR, EDAC_MC,
384 "Unable to get managed device resource\n");
Thor Thayer71bcada2014-09-03 10:27:54 -0500385 res = -ENOMEM;
386 goto free;
387 }
388
389 mci->mtype_cap = MEM_FLAG_DDR3;
390 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
391 mci->edac_cap = EDAC_FLAG_SECDED;
392 mci->mod_name = EDAC_MOD_STR;
393 mci->mod_ver = EDAC_VERSION;
394 mci->ctl_name = dev_name(&pdev->dev);
395 mci->scrub_mode = SCRUB_SW_SRC;
396 mci->dev_name = dev_name(&pdev->dev);
397
398 dimm = *mci->dimms;
399 dimm->nr_pages = ((mem_size - 1) >> PAGE_SHIFT) + 1;
400 dimm->grain = 8;
401 dimm->dtype = DEV_X8;
402 dimm->mtype = MEM_DDR3;
403 dimm->edac_mode = EDAC_SECDED;
404
405 res = edac_mc_add_mc(mci);
406 if (res < 0)
407 goto err;
408
Thor Thayer73bcc942015-06-04 09:28:47 -0500409 /* Only the Arria10 has separate IRQs */
410 if (irq2 > 0) {
411 /* Arria10 specific initialization */
412 res = a10_init(mc_vbase);
413 if (res < 0)
414 goto err2;
415
416 res = devm_request_irq(&pdev->dev, irq2,
417 altr_sdram_mc_err_handler,
418 IRQF_SHARED, dev_name(&pdev->dev), mci);
419 if (res < 0) {
420 edac_mc_printk(mci, KERN_ERR,
421 "Unable to request irq %d\n", irq2);
422 res = -ENODEV;
423 goto err2;
424 }
425
426 res = a10_unmask_irq(pdev, A10_DDR0_IRQ_MASK);
427 if (res < 0)
428 goto err2;
429
430 irqflags = IRQF_SHARED;
431 }
432
Thor Thayer71bcada2014-09-03 10:27:54 -0500433 res = devm_request_irq(&pdev->dev, irq, altr_sdram_mc_err_handler,
Thor Thayer73bcc942015-06-04 09:28:47 -0500434 irqflags, dev_name(&pdev->dev), mci);
Thor Thayer71bcada2014-09-03 10:27:54 -0500435 if (res < 0) {
436 edac_mc_printk(mci, KERN_ERR,
437 "Unable to request irq %d\n", irq);
438 res = -ENODEV;
439 goto err2;
440 }
441
Thor Thayer143f4a52015-06-04 09:28:46 -0500442 /* Infrastructure ready - enable the IRQ */
443 if (regmap_update_bits(drvdata->mc_vbase, priv->ecc_irq_en_offset,
444 priv->ecc_irq_en_mask, priv->ecc_irq_en_mask)) {
Thor Thayer71bcada2014-09-03 10:27:54 -0500445 edac_mc_printk(mci, KERN_ERR,
446 "Error enabling SDRAM ECC IRQ\n");
447 res = -ENODEV;
448 goto err2;
449 }
450
451 altr_sdr_mc_create_debugfs_nodes(mci);
452
453 devres_close_group(&pdev->dev, NULL);
454
455 return 0;
456
457err2:
458 edac_mc_del_mc(&pdev->dev);
459err:
460 devres_release_group(&pdev->dev, NULL);
461free:
462 edac_mc_free(mci);
463 edac_printk(KERN_ERR, EDAC_MC,
464 "EDAC Probe Failed; Error %d\n", res);
465
466 return res;
467}
468
469static int altr_sdram_remove(struct platform_device *pdev)
470{
471 struct mem_ctl_info *mci = platform_get_drvdata(pdev);
472
473 edac_mc_del_mc(&pdev->dev);
474 edac_mc_free(mci);
475 platform_set_drvdata(pdev, NULL);
476
477 return 0;
478}
479
Alan Tull6f2b6422015-06-05 08:49:15 -0500480/*
481 * If you want to suspend, need to disable EDAC by removing it
482 * from the device tree or defconfig.
483 */
484#ifdef CONFIG_PM
485static int altr_sdram_prepare(struct device *dev)
486{
487 pr_err("Suspend not allowed when EDAC is enabled.\n");
488
489 return -EPERM;
490}
491
492static const struct dev_pm_ops altr_sdram_pm_ops = {
493 .prepare = altr_sdram_prepare,
494};
495#endif
496
Thor Thayer71bcada2014-09-03 10:27:54 -0500497static struct platform_driver altr_sdram_edac_driver = {
498 .probe = altr_sdram_probe,
499 .remove = altr_sdram_remove,
500 .driver = {
501 .name = "altr_sdram_edac",
Alan Tull6f2b6422015-06-05 08:49:15 -0500502#ifdef CONFIG_PM
503 .pm = &altr_sdram_pm_ops,
504#endif
Thor Thayer71bcada2014-09-03 10:27:54 -0500505 .of_match_table = altr_sdram_ctrl_of_match,
506 },
507};
508
509module_platform_driver(altr_sdram_edac_driver);
510
511MODULE_LICENSE("GPL v2");
512MODULE_AUTHOR("Thor Thayer");
513MODULE_DESCRIPTION("EDAC Driver for Altera SDRAM Controller");