2 * cpc925_edac.c, EDAC driver for IBM CPC925 Bridge and Memory Controller.
4 * Copyright (c) 2008 Wind River Systems, Inc.
6 * Authors: Cao Qingtao <qingtao.cao@windriver.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
15 * See the GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/module.h>
23 #include <linux/init.h>
25 #include <linux/edac.h>
27 #include <linux/platform_device.h>
29 #include "edac_core.h"
30 #include "edac_module.h"
32 #define CPC925_EDAC_REVISION " Ver: 1.0.0 " __DATE__
33 #define CPC925_EDAC_MOD_STR "cpc925_edac"
35 #define cpc925_printk(level, fmt, arg...) \
36 edac_printk(level, "CPC925", fmt, ##arg)
38 #define cpc925_mc_printk(mci, level, fmt, arg...) \
39 edac_mc_chipset_printk(mci, level, "CPC925", fmt, ##arg)
42 * CPC925 registers are of 32 bits with bit0 defined at the
43 * most significant bit and bit31 at that of least significant.
45 #define CPC925_BITS_PER_REG 32
46 #define CPC925_BIT(nr) (1UL << (CPC925_BITS_PER_REG - 1 - nr))
49 * EDAC device names for the error detections of
50 * CPU Interface and Hypertransport Link.
52 #define CPC925_CPU_ERR_DEV "cpu"
53 #define CPC925_HT_LINK_DEV "htlink"
55 /* Suppose DDR Refresh cycle is 15.6 microsecond */
56 #define CPC925_REF_FREQ 0xFA69
57 #define CPC925_SCRUB_BLOCK_SIZE 64 /* bytes */
58 #define CPC925_NR_CSROWS 8
61 * All registers and bits definitions are taken from
62 * "CPC925 Bridge and Memory Controller User Manual, SA14-2761-02".
66 * CPU and Memory Controller Registers
68 /************************************************************
69 * Processor Interface Exception Mask Register (APIMASK)
70 ************************************************************/
71 #define REG_APIMASK_OFFSET 0x30070
73 APIMASK_DART = CPC925_BIT(0), /* DART Exception */
74 APIMASK_ADI0 = CPC925_BIT(1), /* Handshake Error on PI0_ADI */
75 APIMASK_ADI1 = CPC925_BIT(2), /* Handshake Error on PI1_ADI */
76 APIMASK_STAT = CPC925_BIT(3), /* Status Exception */
77 APIMASK_DERR = CPC925_BIT(4), /* Data Error Exception */
78 APIMASK_ADRS0 = CPC925_BIT(5), /* Addressing Exception on PI0 */
79 APIMASK_ADRS1 = CPC925_BIT(6), /* Addressing Exception on PI1 */
81 APIMASK_ECC_UE_H = CPC925_BIT(8), /* UECC upper */
82 APIMASK_ECC_CE_H = CPC925_BIT(9), /* CECC upper */
83 APIMASK_ECC_UE_L = CPC925_BIT(10), /* UECC lower */
84 APIMASK_ECC_CE_L = CPC925_BIT(11), /* CECC lower */
86 CPU_MASK_ENABLE = (APIMASK_DART | APIMASK_ADI0 | APIMASK_ADI1 |
87 APIMASK_STAT | APIMASK_DERR | APIMASK_ADRS0 |
89 ECC_MASK_ENABLE = (APIMASK_ECC_UE_H | APIMASK_ECC_CE_H |
90 APIMASK_ECC_UE_L | APIMASK_ECC_CE_L),
93 /************************************************************
94 * Processor Interface Exception Register (APIEXCP)
95 ************************************************************/
96 #define REG_APIEXCP_OFFSET 0x30060
98 APIEXCP_DART = CPC925_BIT(0), /* DART Exception */
99 APIEXCP_ADI0 = CPC925_BIT(1), /* Handshake Error on PI0_ADI */
100 APIEXCP_ADI1 = CPC925_BIT(2), /* Handshake Error on PI1_ADI */
101 APIEXCP_STAT = CPC925_BIT(3), /* Status Exception */
102 APIEXCP_DERR = CPC925_BIT(4), /* Data Error Exception */
103 APIEXCP_ADRS0 = CPC925_BIT(5), /* Addressing Exception on PI0 */
104 APIEXCP_ADRS1 = CPC925_BIT(6), /* Addressing Exception on PI1 */
105 /* BIT(7) Reserved */
106 APIEXCP_ECC_UE_H = CPC925_BIT(8), /* UECC upper */
107 APIEXCP_ECC_CE_H = CPC925_BIT(9), /* CECC upper */
108 APIEXCP_ECC_UE_L = CPC925_BIT(10), /* UECC lower */
109 APIEXCP_ECC_CE_L = CPC925_BIT(11), /* CECC lower */
111 CPU_EXCP_DETECTED = (APIEXCP_DART | APIEXCP_ADI0 | APIEXCP_ADI1 |
112 APIEXCP_STAT | APIEXCP_DERR | APIEXCP_ADRS0 |
114 UECC_EXCP_DETECTED = (APIEXCP_ECC_UE_H | APIEXCP_ECC_UE_L),
115 CECC_EXCP_DETECTED = (APIEXCP_ECC_CE_H | APIEXCP_ECC_CE_L),
116 ECC_EXCP_DETECTED = (UECC_EXCP_DETECTED | CECC_EXCP_DETECTED),
119 /************************************************************
120 * Memory Bus Configuration Register (MBCR)
121 ************************************************************/
122 #define REG_MBCR_OFFSET 0x2190
123 #define MBCR_64BITCFG_SHIFT 23
124 #define MBCR_64BITCFG_MASK (1UL << MBCR_64BITCFG_SHIFT)
125 #define MBCR_64BITBUS_SHIFT 22
126 #define MBCR_64BITBUS_MASK (1UL << MBCR_64BITBUS_SHIFT)
128 /************************************************************
129 * Memory Bank Mode Register (MBMR)
130 ************************************************************/
131 #define REG_MBMR_OFFSET 0x21C0
132 #define MBMR_MODE_MAX_VALUE 0xF
133 #define MBMR_MODE_SHIFT 25
134 #define MBMR_MODE_MASK (MBMR_MODE_MAX_VALUE << MBMR_MODE_SHIFT)
135 #define MBMR_BBA_SHIFT 24
136 #define MBMR_BBA_MASK (1UL << MBMR_BBA_SHIFT)
138 /************************************************************
139 * Memory Bank Boundary Address Register (MBBAR)
140 ************************************************************/
141 #define REG_MBBAR_OFFSET 0x21D0
142 #define MBBAR_BBA_MAX_VALUE 0xFF
143 #define MBBAR_BBA_SHIFT 24
144 #define MBBAR_BBA_MASK (MBBAR_BBA_MAX_VALUE << MBBAR_BBA_SHIFT)
146 /************************************************************
147 * Memory Scrub Control Register (MSCR)
148 ************************************************************/
149 #define REG_MSCR_OFFSET 0x2400
150 #define MSCR_SCRUB_MOD_MASK 0xC0000000 /* scrub_mod - bit0:1*/
151 #define MSCR_BACKGR_SCRUB 0x40000000 /* 01 */
152 #define MSCR_SI_SHIFT 16 /* si - bit8:15*/
153 #define MSCR_SI_MAX_VALUE 0xFF
154 #define MSCR_SI_MASK (MSCR_SI_MAX_VALUE << MSCR_SI_SHIFT)
156 /************************************************************
157 * Memory Scrub Range Start Register (MSRSR)
158 ************************************************************/
159 #define REG_MSRSR_OFFSET 0x2410
161 /************************************************************
162 * Memory Scrub Range End Register (MSRER)
163 ************************************************************/
164 #define REG_MSRER_OFFSET 0x2420
166 /************************************************************
167 * Memory Scrub Pattern Register (MSPR)
168 ************************************************************/
169 #define REG_MSPR_OFFSET 0x2430
171 /************************************************************
172 * Memory Check Control Register (MCCR)
173 ************************************************************/
174 #define REG_MCCR_OFFSET 0x2440
176 MCCR_ECC_EN = CPC925_BIT(0), /* ECC high and low check */
179 /************************************************************
180 * Memory Check Range End Register (MCRER)
181 ************************************************************/
182 #define REG_MCRER_OFFSET 0x2450
184 /************************************************************
185 * Memory Error Address Register (MEAR)
186 ************************************************************/
187 #define REG_MEAR_OFFSET 0x2460
188 #define MEAR_BCNT_MAX_VALUE 0x3
189 #define MEAR_BCNT_SHIFT 30
190 #define MEAR_BCNT_MASK (MEAR_BCNT_MAX_VALUE << MEAR_BCNT_SHIFT)
191 #define MEAR_RANK_MAX_VALUE 0x7
192 #define MEAR_RANK_SHIFT 27
193 #define MEAR_RANK_MASK (MEAR_RANK_MAX_VALUE << MEAR_RANK_SHIFT)
194 #define MEAR_COL_MAX_VALUE 0x7FF
195 #define MEAR_COL_SHIFT 16
196 #define MEAR_COL_MASK (MEAR_COL_MAX_VALUE << MEAR_COL_SHIFT)
197 #define MEAR_BANK_MAX_VALUE 0x3
198 #define MEAR_BANK_SHIFT 14
199 #define MEAR_BANK_MASK (MEAR_BANK_MAX_VALUE << MEAR_BANK_SHIFT)
200 #define MEAR_ROW_MASK 0x00003FFF
202 /************************************************************
203 * Memory Error Syndrome Register (MESR)
204 ************************************************************/
205 #define REG_MESR_OFFSET 0x2470
206 #define MESR_ECC_SYN_H_MASK 0xFF00
207 #define MESR_ECC_SYN_L_MASK 0x00FF
209 /************************************************************
210 * Memory Mode Control Register (MMCR)
211 ************************************************************/
212 #define REG_MMCR_OFFSET 0x2500
214 MMCR_REG_DIMM_MODE = CPC925_BIT(3),
218 * HyperTransport Link Registers
220 /************************************************************
221 * Error Handling/Enumeration Scratch Pad Register (ERRCTRL)
222 ************************************************************/
223 #define REG_ERRCTRL_OFFSET 0x70140
224 enum errctrl_bits { /* nonfatal interrupts for */
225 ERRCTRL_SERR_NF = CPC925_BIT(0), /* system error */
226 ERRCTRL_CRC_NF = CPC925_BIT(1), /* CRC error */
227 ERRCTRL_RSP_NF = CPC925_BIT(2), /* Response error */
228 ERRCTRL_EOC_NF = CPC925_BIT(3), /* End-Of-Chain error */
229 ERRCTRL_OVF_NF = CPC925_BIT(4), /* Overflow error */
230 ERRCTRL_PROT_NF = CPC925_BIT(5), /* Protocol error */
232 ERRCTRL_RSP_ERR = CPC925_BIT(6), /* Response error received */
233 ERRCTRL_CHN_FAL = CPC925_BIT(7), /* Sync flooding detected */
235 HT_ERRCTRL_ENABLE = (ERRCTRL_SERR_NF | ERRCTRL_CRC_NF |
236 ERRCTRL_RSP_NF | ERRCTRL_EOC_NF |
237 ERRCTRL_OVF_NF | ERRCTRL_PROT_NF),
238 HT_ERRCTRL_DETECTED = (ERRCTRL_RSP_ERR | ERRCTRL_CHN_FAL),
241 /************************************************************
242 * Link Configuration and Link Control Register (LINKCTRL)
243 ************************************************************/
244 #define REG_LINKCTRL_OFFSET 0x70110
246 LINKCTRL_CRC_ERR = (CPC925_BIT(22) | CPC925_BIT(23)),
247 LINKCTRL_LINK_FAIL = CPC925_BIT(27),
249 HT_LINKCTRL_DETECTED = (LINKCTRL_CRC_ERR | LINKCTRL_LINK_FAIL),
252 /************************************************************
253 * Link FreqCap/Error/Freq/Revision ID Register (LINKERR)
254 ************************************************************/
255 #define REG_LINKERR_OFFSET 0x70120
257 LINKERR_EOC_ERR = CPC925_BIT(17), /* End-Of-Chain error */
258 LINKERR_OVF_ERR = CPC925_BIT(18), /* Receive Buffer Overflow */
259 LINKERR_PROT_ERR = CPC925_BIT(19), /* Protocol error */
261 HT_LINKERR_DETECTED = (LINKERR_EOC_ERR | LINKERR_OVF_ERR |
265 /************************************************************
266 * Bridge Control Register (BRGCTRL)
267 ************************************************************/
268 #define REG_BRGCTRL_OFFSET 0x70300
270 BRGCTRL_DETSERR = CPC925_BIT(0), /* SERR on Secondary Bus */
271 BRGCTRL_SECBUSRESET = CPC925_BIT(9), /* Secondary Bus Reset */
274 /* Private structure for edac memory controller */
275 struct cpc925_mc_pdata {
277 unsigned long total_mem;
282 /* Private structure for common edac device */
283 struct cpc925_dev_info {
285 struct platform_device *pdev;
288 struct edac_device_ctl_info *edac_dev;
289 void (*init)(struct cpc925_dev_info *dev_info);
290 void (*exit)(struct cpc925_dev_info *dev_info);
291 void (*check)(struct edac_device_ctl_info *edac_dev);
294 /* Get total memory size from Open Firmware DTB */
295 static void get_total_mem(struct cpc925_mc_pdata *pdata)
297 struct device_node *np = NULL;
298 const unsigned int *reg, *reg_end;
300 unsigned long start, size;
302 np = of_find_node_by_type(NULL, "memory");
306 aw = of_n_addr_cells(np);
307 sw = of_n_size_cells(np);
308 reg = (const unsigned int *)of_get_property(np, "reg", &len);
309 reg_end = reg + len/4;
311 pdata->total_mem = 0;
313 start = of_read_number(reg, aw);
315 size = of_read_number(reg, sw);
317 debugf1("%s: start 0x%lx, size 0x%lx\n", __func__,
319 pdata->total_mem += size;
320 } while (reg < reg_end);
323 debugf0("%s: total_mem 0x%lx\n", __func__, pdata->total_mem);
326 static void cpc925_init_csrows(struct mem_ctl_info *mci)
328 struct cpc925_mc_pdata *pdata = mci->pvt_info;
329 struct csrow_info *csrow;
331 u32 mbmr, mbbar, bba;
332 unsigned long row_size, last_nr_pages = 0;
334 get_total_mem(pdata);
336 for (index = 0; index < mci->nr_csrows; index++) {
337 mbmr = __raw_readl(pdata->vbase + REG_MBMR_OFFSET +
339 mbbar = __raw_readl(pdata->vbase + REG_MBBAR_OFFSET +
341 bba = (((mbmr & MBMR_BBA_MASK) >> MBMR_BBA_SHIFT) << 8) |
342 ((mbbar & MBBAR_BBA_MASK) >> MBBAR_BBA_SHIFT);
345 continue; /* not populated */
347 csrow = &mci->csrows[index];
349 row_size = bba * (1UL << 28); /* 256M */
350 csrow->first_page = last_nr_pages;
351 csrow->nr_pages = row_size >> PAGE_SHIFT;
352 csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
353 last_nr_pages = csrow->last_page + 1;
355 csrow->mtype = MEM_RDDR;
356 csrow->edac_mode = EDAC_SECDED;
358 switch (csrow->nr_channels) {
359 case 1: /* Single channel */
360 csrow->grain = 32; /* four-beat burst of 32 bytes */
362 case 2: /* Dual channel */
364 csrow->grain = 64; /* four-beat burst of 64 bytes */
368 switch ((mbmr & MBMR_MODE_MASK) >> MBMR_MODE_SHIFT) {
369 case 6: /* 0110, no way to differentiate X8 VS X16 */
372 csrow->dtype = DEV_X16;
376 csrow->dtype = DEV_X8;
379 csrow->dtype = DEV_UNKNOWN;
385 /* Enable memory controller ECC detection */
386 static void cpc925_mc_init(struct mem_ctl_info *mci)
388 struct cpc925_mc_pdata *pdata = mci->pvt_info;
392 /* Enable various ECC error exceptions */
393 apimask = __raw_readl(pdata->vbase + REG_APIMASK_OFFSET);
394 if ((apimask & ECC_MASK_ENABLE) == 0) {
395 apimask |= ECC_MASK_ENABLE;
396 __raw_writel(apimask, pdata->vbase + REG_APIMASK_OFFSET);
399 /* Enable ECC detection */
400 mccr = __raw_readl(pdata->vbase + REG_MCCR_OFFSET);
401 if ((mccr & MCCR_ECC_EN) == 0) {
403 __raw_writel(mccr, pdata->vbase + REG_MCCR_OFFSET);
407 /* Disable memory controller ECC detection */
408 static void cpc925_mc_exit(struct mem_ctl_info *mci)
412 * We are supposed to clear the ECC error detection bits,
413 * and it will be no problem to do so. However, once they
414 * are cleared here if we want to re-install CPC925 EDAC
415 * module later, setting them up in cpc925_mc_init() will
416 * trigger machine check exception.
417 * Also, it's ok to leave ECC error detection bits enabled,
418 * since they are reset to 1 by default or by boot loader.
425 * Revert DDR column/row/bank addresses into page frame number and
428 * Suppose memory mode is 0x0111(128-bit mode, identical DIMM pairs),
429 * physical address(PA) bits to column address(CA) bits mappings are:
430 * CA 0 1 2 3 4 5 6 7 8 9 10
431 * PA 59 58 57 56 55 54 53 52 51 50 49
433 * physical address(PA) bits to bank address(BA) bits mappings are:
437 * physical address(PA) bits to row address(RA) bits mappings are:
438 * RA 0 1 2 3 4 5 6 7 8 9 10 11 12
439 * PA 36 35 34 48 47 46 45 40 41 42 39 38 37
441 static void cpc925_mc_get_pfn(struct mem_ctl_info *mci, u32 mear,
442 unsigned long *pfn, unsigned long *offset, int *csrow)
444 u32 bcnt, rank, col, bank, row;
449 bcnt = (mear & MEAR_BCNT_MASK) >> MEAR_BCNT_SHIFT;
450 rank = (mear & MEAR_RANK_MASK) >> MEAR_RANK_SHIFT;
451 col = (mear & MEAR_COL_MASK) >> MEAR_COL_SHIFT;
452 bank = (mear & MEAR_BANK_MASK) >> MEAR_BANK_SHIFT;
453 row = mear & MEAR_ROW_MASK;
457 #ifdef CONFIG_EDAC_DEBUG
458 if (mci->csrows[rank].first_page == 0) {
459 cpc925_mc_printk(mci, KERN_ERR, "ECC occurs in a "
460 "non-populated csrow, broken hardware?\n");
465 /* Revert csrow number */
466 pa = mci->csrows[rank].first_page << PAGE_SHIFT;
468 /* Revert column address */
470 for (i = 0; i < 11; i++) {
476 /* Revert bank address */
479 /* Revert row address, in 4 steps */
480 for (i = 0; i < 3; i++) {
486 for (i = 0; i < 3; i++) {
492 for (i = 0; i < 4; i++) {
498 for (i = 0; i < 3; i++) {
504 *offset = pa & (PAGE_SIZE - 1);
505 *pfn = pa >> PAGE_SHIFT;
507 debugf0("%s: ECC physical address 0x%lx\n", __func__, pa);
510 static int cpc925_mc_find_channel(struct mem_ctl_info *mci, u16 syndrome)
512 if ((syndrome & MESR_ECC_SYN_H_MASK) == 0)
515 if ((syndrome & MESR_ECC_SYN_L_MASK) == 0)
518 cpc925_mc_printk(mci, KERN_INFO, "Unexpected syndrome value: 0x%x\n",
523 /* Check memory controller registers for ECC errors */
524 static void cpc925_mc_check(struct mem_ctl_info *mci)
526 struct cpc925_mc_pdata *pdata = mci->pvt_info;
531 unsigned long pfn = 0, offset = 0;
532 int csrow = 0, channel = 0;
534 /* APIEXCP is cleared when read */
535 apiexcp = __raw_readl(pdata->vbase + REG_APIEXCP_OFFSET);
536 if ((apiexcp & ECC_EXCP_DETECTED) == 0)
539 mesr = __raw_readl(pdata->vbase + REG_MESR_OFFSET);
540 syndrome = mesr | (MESR_ECC_SYN_H_MASK | MESR_ECC_SYN_L_MASK);
542 mear = __raw_readl(pdata->vbase + REG_MEAR_OFFSET);
544 /* Revert column/row addresses into page frame number, etc */
545 cpc925_mc_get_pfn(mci, mear, &pfn, &offset, &csrow);
547 if (apiexcp & CECC_EXCP_DETECTED) {
548 cpc925_mc_printk(mci, KERN_INFO, "DRAM CECC Fault\n");
549 channel = cpc925_mc_find_channel(mci, syndrome);
550 edac_mc_handle_ce(mci, pfn, offset, syndrome,
551 csrow, channel, mci->ctl_name);
554 if (apiexcp & UECC_EXCP_DETECTED) {
555 cpc925_mc_printk(mci, KERN_INFO, "DRAM UECC Fault\n");
556 edac_mc_handle_ue(mci, pfn, offset, csrow, mci->ctl_name);
559 cpc925_mc_printk(mci, KERN_INFO, "Dump registers:\n");
560 cpc925_mc_printk(mci, KERN_INFO, "APIMASK 0x%08x\n",
561 __raw_readl(pdata->vbase + REG_APIMASK_OFFSET));
562 cpc925_mc_printk(mci, KERN_INFO, "APIEXCP 0x%08x\n",
564 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Ctrl 0x%08x\n",
565 __raw_readl(pdata->vbase + REG_MSCR_OFFSET));
566 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge Start 0x%08x\n",
567 __raw_readl(pdata->vbase + REG_MSRSR_OFFSET));
568 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge End 0x%08x\n",
569 __raw_readl(pdata->vbase + REG_MSRER_OFFSET));
570 cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Pattern 0x%08x\n",
571 __raw_readl(pdata->vbase + REG_MSPR_OFFSET));
572 cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Ctrl 0x%08x\n",
573 __raw_readl(pdata->vbase + REG_MCCR_OFFSET));
574 cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Rge End 0x%08x\n",
575 __raw_readl(pdata->vbase + REG_MCRER_OFFSET));
576 cpc925_mc_printk(mci, KERN_INFO, "Mem Err Address 0x%08x\n",
578 cpc925_mc_printk(mci, KERN_INFO, "Mem Err Syndrome 0x%08x\n",
582 /******************** CPU err device********************************/
583 /* Enable CPU Errors detection */
584 static void cpc925_cpu_init(struct cpc925_dev_info *dev_info)
588 apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
589 if ((apimask & CPU_MASK_ENABLE) == 0) {
590 apimask |= CPU_MASK_ENABLE;
591 __raw_writel(apimask, dev_info->vbase + REG_APIMASK_OFFSET);
595 /* Disable CPU Errors detection */
596 static void cpc925_cpu_exit(struct cpc925_dev_info *dev_info)
600 * We are supposed to clear the CPU error detection bits,
601 * and it will be no problem to do so. However, once they
602 * are cleared here if we want to re-install CPC925 EDAC
603 * module later, setting them up in cpc925_cpu_init() will
604 * trigger machine check exception.
605 * Also, it's ok to leave CPU error detection bits enabled,
606 * since they are reset to 1 by default.
612 /* Check for CPU Errors */
613 static void cpc925_cpu_check(struct edac_device_ctl_info *edac_dev)
615 struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
619 /* APIEXCP is cleared when read */
620 apiexcp = __raw_readl(dev_info->vbase + REG_APIEXCP_OFFSET);
621 if ((apiexcp & CPU_EXCP_DETECTED) == 0)
624 apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
625 cpc925_printk(KERN_INFO, "Processor Interface Fault\n"
626 "Processor Interface register dump:\n");
627 cpc925_printk(KERN_INFO, "APIMASK 0x%08x\n", apimask);
628 cpc925_printk(KERN_INFO, "APIEXCP 0x%08x\n", apiexcp);
630 edac_device_handle_ue(edac_dev, 0, 0, edac_dev->ctl_name);
633 /******************** HT Link err device****************************/
634 /* Enable HyperTransport Link Error detection */
635 static void cpc925_htlink_init(struct cpc925_dev_info *dev_info)
639 ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
640 if ((ht_errctrl & HT_ERRCTRL_ENABLE) == 0) {
641 ht_errctrl |= HT_ERRCTRL_ENABLE;
642 __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
646 /* Disable HyperTransport Link Error detection */
647 static void cpc925_htlink_exit(struct cpc925_dev_info *dev_info)
651 ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
652 ht_errctrl &= ~HT_ERRCTRL_ENABLE;
653 __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
656 /* Check for HyperTransport Link errors */
657 static void cpc925_htlink_check(struct edac_device_ctl_info *edac_dev)
659 struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
660 u32 brgctrl = __raw_readl(dev_info->vbase + REG_BRGCTRL_OFFSET);
661 u32 linkctrl = __raw_readl(dev_info->vbase + REG_LINKCTRL_OFFSET);
662 u32 errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
663 u32 linkerr = __raw_readl(dev_info->vbase + REG_LINKERR_OFFSET);
665 if (!((brgctrl & BRGCTRL_DETSERR) ||
666 (linkctrl & HT_LINKCTRL_DETECTED) ||
667 (errctrl & HT_ERRCTRL_DETECTED) ||
668 (linkerr & HT_LINKERR_DETECTED)))
671 cpc925_printk(KERN_INFO, "HT Link Fault\n"
672 "HT register dump:\n");
673 cpc925_printk(KERN_INFO, "Bridge Ctrl 0x%08x\n",
675 cpc925_printk(KERN_INFO, "Link Config Ctrl 0x%08x\n",
677 cpc925_printk(KERN_INFO, "Error Enum and Ctrl 0x%08x\n",
679 cpc925_printk(KERN_INFO, "Link Error 0x%08x\n",
682 /* Clear by write 1 */
683 if (brgctrl & BRGCTRL_DETSERR)
684 __raw_writel(BRGCTRL_DETSERR,
685 dev_info->vbase + REG_BRGCTRL_OFFSET);
687 if (linkctrl & HT_LINKCTRL_DETECTED)
688 __raw_writel(HT_LINKCTRL_DETECTED,
689 dev_info->vbase + REG_LINKCTRL_OFFSET);
691 /* Initiate Secondary Bus Reset to clear the chain failure */
692 if (errctrl & ERRCTRL_CHN_FAL)
693 __raw_writel(BRGCTRL_SECBUSRESET,
694 dev_info->vbase + REG_BRGCTRL_OFFSET);
696 if (errctrl & ERRCTRL_RSP_ERR)
697 __raw_writel(ERRCTRL_RSP_ERR,
698 dev_info->vbase + REG_ERRCTRL_OFFSET);
700 if (linkerr & HT_LINKERR_DETECTED)
701 __raw_writel(HT_LINKERR_DETECTED,
702 dev_info->vbase + REG_LINKERR_OFFSET);
704 edac_device_handle_ce(edac_dev, 0, 0, edac_dev->ctl_name);
707 static struct cpc925_dev_info cpc925_devs[] = {
709 .ctl_name = CPC925_CPU_ERR_DEV,
710 .init = cpc925_cpu_init,
711 .exit = cpc925_cpu_exit,
712 .check = cpc925_cpu_check,
715 .ctl_name = CPC925_HT_LINK_DEV,
716 .init = cpc925_htlink_init,
717 .exit = cpc925_htlink_exit,
718 .check = cpc925_htlink_check,
720 {0}, /* Terminated by NULL */
724 * Add CPU Err detection and HyperTransport Link Err detection
725 * as common "edac_device", they have no corresponding device
726 * nodes in the Open Firmware DTB and we have to add platform
727 * devices for them. Also, they will share the MMIO with that
728 * of memory controller.
730 static void cpc925_add_edac_devices(void __iomem *vbase)
732 struct cpc925_dev_info *dev_info;
735 cpc925_printk(KERN_ERR, "MMIO not established yet\n");
739 for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
740 dev_info->vbase = vbase;
741 dev_info->pdev = platform_device_register_simple(
742 dev_info->ctl_name, 0, NULL, 0);
743 if (IS_ERR(dev_info->pdev)) {
744 cpc925_printk(KERN_ERR,
745 "Can't register platform device for %s\n",
751 * Don't have to allocate private structure but
752 * make use of cpc925_devs[] instead.
754 dev_info->edac_idx = edac_device_alloc_index();
756 edac_device_alloc_ctl_info(0, dev_info->ctl_name,
757 1, NULL, 0, 0, NULL, 0, dev_info->edac_idx);
758 if (!dev_info->edac_dev) {
759 cpc925_printk(KERN_ERR, "No memory for edac device\n");
763 dev_info->edac_dev->pvt_info = dev_info;
764 dev_info->edac_dev->dev = &dev_info->pdev->dev;
765 dev_info->edac_dev->ctl_name = dev_info->ctl_name;
766 dev_info->edac_dev->mod_name = CPC925_EDAC_MOD_STR;
767 dev_info->edac_dev->dev_name = dev_name(&dev_info->pdev->dev);
769 if (edac_op_state == EDAC_OPSTATE_POLL)
770 dev_info->edac_dev->edac_check = dev_info->check;
773 dev_info->init(dev_info);
775 if (edac_device_add_device(dev_info->edac_dev) > 0) {
776 cpc925_printk(KERN_ERR,
777 "Unable to add edac device for %s\n",
782 debugf0("%s: Successfully added edac device for %s\n",
783 __func__, dev_info->ctl_name);
789 dev_info->exit(dev_info);
790 edac_device_free_ctl_info(dev_info->edac_dev);
792 platform_device_unregister(dev_info->pdev);
797 * Delete the common "edac_device" for CPU Err Detection
798 * and HyperTransport Link Err Detection
800 static void cpc925_del_edac_devices(void)
802 struct cpc925_dev_info *dev_info;
804 for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
805 if (dev_info->edac_dev) {
806 edac_device_del_device(dev_info->edac_dev->dev);
807 edac_device_free_ctl_info(dev_info->edac_dev);
808 platform_device_unregister(dev_info->pdev);
812 dev_info->exit(dev_info);
814 debugf0("%s: Successfully deleted edac device for %s\n",
815 __func__, dev_info->ctl_name);
819 /* Convert current back-ground scrub rate into byte/sec bandwith */
820 static int cpc925_get_sdram_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
822 struct cpc925_mc_pdata *pdata = mci->pvt_info;
826 mscr = __raw_readl(pdata->vbase + REG_MSCR_OFFSET);
827 si = (mscr & MSCR_SI_MASK) >> MSCR_SI_SHIFT;
829 debugf0("%s, Mem Scrub Ctrl Register 0x%x\n", __func__, mscr);
831 if (((mscr & MSCR_SCRUB_MOD_MASK) != MSCR_BACKGR_SCRUB) ||
833 cpc925_mc_printk(mci, KERN_INFO, "Scrub mode not enabled\n");
836 *bw = CPC925_SCRUB_BLOCK_SIZE * 0xFA67 / si;
841 /* Return 0 for single channel; 1 for dual channel */
842 static int cpc925_mc_get_channels(void __iomem *vbase)
847 mbcr = __raw_readl(vbase + REG_MBCR_OFFSET);
850 * Dual channel only when 128-bit wide physical bus
851 * and 128-bit configuration.
853 if (((mbcr & MBCR_64BITCFG_MASK) == 0) &&
854 ((mbcr & MBCR_64BITBUS_MASK) == 0))
857 debugf0("%s: %s channel\n", __func__,
858 (dual > 0) ? "Dual" : "Single");
863 static int __devinit cpc925_probe(struct platform_device *pdev)
865 static int edac_mc_idx;
866 struct mem_ctl_info *mci;
868 struct cpc925_mc_pdata *pdata;
870 int res = 0, nr_channels;
872 debugf0("%s: %s platform device found!\n", __func__, pdev->name);
874 if (!devres_open_group(&pdev->dev, cpc925_probe, GFP_KERNEL)) {
879 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
881 cpc925_printk(KERN_ERR, "Unable to get resource\n");
886 if (!devm_request_mem_region(&pdev->dev,
888 r->end - r->start + 1,
890 cpc925_printk(KERN_ERR, "Unable to request mem region\n");
895 vbase = devm_ioremap(&pdev->dev, r->start, r->end - r->start + 1);
897 cpc925_printk(KERN_ERR, "Unable to ioremap device\n");
902 nr_channels = cpc925_mc_get_channels(vbase);
903 mci = edac_mc_alloc(sizeof(struct cpc925_mc_pdata),
904 CPC925_NR_CSROWS, nr_channels + 1, edac_mc_idx);
906 cpc925_printk(KERN_ERR, "No memory for mem_ctl_info\n");
911 pdata = mci->pvt_info;
912 pdata->vbase = vbase;
913 pdata->edac_idx = edac_mc_idx++;
914 pdata->name = pdev->name;
916 mci->dev = &pdev->dev;
917 platform_set_drvdata(pdev, mci);
918 mci->dev_name = dev_name(&pdev->dev);
919 mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR;
920 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
921 mci->edac_cap = EDAC_FLAG_SECDED;
922 mci->mod_name = CPC925_EDAC_MOD_STR;
923 mci->mod_ver = CPC925_EDAC_REVISION;
924 mci->ctl_name = pdev->name;
926 if (edac_op_state == EDAC_OPSTATE_POLL)
927 mci->edac_check = cpc925_mc_check;
929 mci->ctl_page_to_phys = NULL;
930 mci->scrub_mode = SCRUB_SW_SRC;
931 mci->set_sdram_scrub_rate = NULL;
932 mci->get_sdram_scrub_rate = cpc925_get_sdram_scrub_rate;
934 cpc925_init_csrows(mci);
936 /* Setup memory controller registers */
939 if (edac_mc_add_mc(mci) > 0) {
940 cpc925_mc_printk(mci, KERN_ERR, "Failed edac_mc_add_mc()\n");
944 cpc925_add_edac_devices(vbase);
946 /* get this far and it's successful */
947 debugf0("%s: success\n", __func__);
956 devm_release_mem_region(&pdev->dev, r->start, r->end-r->start+1);
958 devres_release_group(&pdev->dev, cpc925_probe);
963 static int cpc925_remove(struct platform_device *pdev)
965 struct mem_ctl_info *mci = platform_get_drvdata(pdev);
968 * Delete common edac devices before edac mc, because
969 * the former share the MMIO of the latter.
971 cpc925_del_edac_devices();
974 edac_mc_del_mc(&pdev->dev);
980 static struct platform_driver cpc925_edac_driver = {
981 .probe = cpc925_probe,
982 .remove = cpc925_remove,
984 .name = "cpc925_edac",
988 static int __init cpc925_edac_init(void)
992 printk(KERN_INFO "IBM CPC925 EDAC driver " CPC925_EDAC_REVISION "\n");
993 printk(KERN_INFO "\t(c) 2008 Wind River Systems, Inc\n");
995 /* Only support POLL mode so far */
996 edac_op_state = EDAC_OPSTATE_POLL;
998 ret = platform_driver_register(&cpc925_edac_driver);
1000 printk(KERN_WARNING "Failed to register %s\n",
1001 CPC925_EDAC_MOD_STR);
1007 static void __exit cpc925_edac_exit(void)
1009 platform_driver_unregister(&cpc925_edac_driver);
1012 module_init(cpc925_edac_init);
1013 module_exit(cpc925_edac_exit);
1015 MODULE_LICENSE("GPL");
1016 MODULE_AUTHOR("Cao Qingtao <qingtao.cao@windriver.com>");
1017 MODULE_DESCRIPTION("IBM CPC925 Bridge and MC EDAC kernel module");