[v0 PATCH 2/5] EDAC: Add CPC925 driver source file

Harry Ciao
2009-04-02T06:11:14Z

Introduce IBM CPC925 EDAC driver source file, which makes use of error
detections on the IBM CPC925 Bridge and Memory Controller.

Signed-off-by: Harry Ciao <qingtao.cao@windriver.com>
---
drivers/edac/cpc925_edac.c | 757 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 757 insertions(+)
create mode 100644 drivers/edac/cpc925_edac.c

--- /dev/null
+++ b/drivers/edac/cpc925_edac.c
@@ -0,0 +1,757 @@
+/*
+ * cpc925_edac.c, IBM CPC925 Bridge and Memory controller EDAC kernel module
+ *
+ * Copyright (c) 2008 Wind River Systems, Inc.
+ *
+ * Authors: Cao Qingtao <qingtao.cao@windriver.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/edac.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include "edac_core.h"
+#include "edac_module.h"
+#include "cpc925_edac.h"
+
+static int edac_mc_idx;
+
+/* Get total memory size from Open Firmware DTB */
+static void get_total_mem(struct cpc925_mc_pdata *pdata)
+{
+ struct device_node *np = NULL;
+ const unsigned int *reg, *reg_end;
+ int len, sw, aw;
+ unsigned long start, size;
+
+ np = of_find_node_by_type(NULL, "memory");
+ if (!np)
+ return;
+
+ aw = of_n_addr_cells(np);
+ sw = of_n_size_cells(np);
+ reg = (const unsigned int *)of_get_property(np, "reg", &len);
+ reg_end = reg + len/4;
+
+ pdata->total_mem = 0;
+ do {
+ start = of_read_number(reg, aw);
+ reg += aw;
+ size = of_read_number(reg, sw);
+ reg += sw;
+ debugf1("%s: start 0x%lx, size 0x%lx\n", __func__,
+ start, size);
+ pdata->total_mem += size;
+ } while (reg < reg_end);
+
+ of_node_put(np);
+ debugf0("%s: total_mem 0x%lx\n", __func__, pdata->total_mem);
+}
+
+static void cpc925_init_csrows(struct mem_ctl_info *mci)
+{
+ struct cpc925_mc_pdata *pdata = mci->pvt_info;
+ struct csrow_info *csrow;
+ int index;
+ u32 mbmr, mbbar, bba;
+ unsigned long row_size, last_nr_pages = 0;
+
+ get_total_mem(pdata);
+
+ for (index = 0; index < mci->nr_csrows; index++) {
+ mbmr = __raw_readl(pdata->vbase + REG_MBMR_OFFSET +
+ 0x20 * index);
+ mbbar = __raw_readl(pdata->vbase + REG_MBBAR_OFFSET +
+ 0x20 + index);
+ bba = (((mbmr & MBMR_BBA_MASK) >> MBMR_BBA_SHIFT) << 8) |
+ ((mbbar & MBBAR_BBA_MASK) >> MBBAR_BBA_SHIFT);
+
+ if (bba == 0)
+ continue; /* not populated */
+
+ csrow = &mci->csrows[index];
+
+ row_size = bba * (1UL << 28); /* 256M */
+ csrow->first_page = last_nr_pages;
+ csrow->nr_pages = row_size >> PAGE_SHIFT;
+ csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
+ last_nr_pages = csrow->last_page + 1;
+
+ csrow->mtype = MEM_RDDR;
+ csrow->edac_mode = EDAC_SECDED;
+
+ switch (csrow->nr_channels) {
+ case 1: /* Single channel */
+ csrow->grain = 32; /* four-beat burst of 32 bytes */
+ break;
+ case 2: /* Dual channel */
+ default:
+ csrow->grain = 64; /* four-beat burst of 64 bytes */
+ break;
+ }
+
+ switch ((mbmr & MBMR_MODE_MASK) >> MBMR_MODE_SHIFT) {
+ case 6: /* 0110, no way to differentiate X8 VS X16 */
+ case 5: /* 0101 */
+ case 8: /* 1000 */
+ csrow->dtype = DEV_X16;
+ break;
+ case 7: /* 0111 */
+ case 9: /* 1001 */
+ csrow->dtype = DEV_X8;
+ break;
+ default:
+ csrow->dtype = DEV_UNKNOWN;
+ break;
+ }
+ }
+}
+
+/* Enable memory controller ECC detection */
+static void cpc925_mc_init(struct mem_ctl_info *mci)
+{
+ struct cpc925_mc_pdata *pdata = mci->pvt_info;
+ u32 apimask;
+ u32 mccr;
+
+ /* Enable various ECC error exceptions */
+ apimask = __raw_readl(pdata->vbase + REG_APIMASK_OFFSET);
+ if ((apimask & ECC_MASK_ENABLE) == 0) {
+ apimask |= ECC_MASK_ENABLE;
+ __raw_writel(apimask, pdata->vbase + REG_APIMASK_OFFSET);
+ }
+
+ /* Enable ECC detection */
+ mccr = __raw_readl(pdata->vbase + REG_MCCR_OFFSET);
+ if ((mccr & MCCR_ECC_EN) == 0) {
+ mccr |= MCCR_ECC_EN;
+ __raw_writel(mccr, pdata->vbase + REG_MCCR_OFFSET);
+ }
+}
+
+/* Disable memory controller ECC detection */
+static void cpc925_mc_exit(struct mem_ctl_info *mci)
+{
+ /*
+ * WARNING:
+ * We are supposed to clear the ECC error detection bits,
+ * and it will be no problem to do so. However, once they
+ * are cleared here if we want to re-install CPC925 EDAC
+ * module later, setting them up in cpc925_mc_init() will
+ * trigger machine check exception.
+ * Also, it's ok to leave ECC error detection bits enabled,
+ * since they are reset to 1 by default or by boot loader.
+ */
+
+ return;
+}
+
+/*
+ * Revert DDR column/row/bank addresses into page frame number and
+ * offset in page.
+ *
+ * Suppose memory mode is 0x0111(128-bit mode, identical DIMM pairs),
+ * physical address(PA) bits to column address(CA) bits mappings are:
+ * CA 0 1 2 3 4 5 6 7 8 9 10
+ * PA 59 58 57 56 55 54 53 52 51 50 49
+ *
+ * physical address(PA) bits to bank address(BA) bits mappings are:
+ * BA 0 1
+ * PA 43 44
+ *
+ * physical address(PA) bits to row address(RA) bits mappings are:
+ * RA 0 1 2 3 4 5 6 7 8 9 10 11 12
+ * PA 36 35 34 48 47 46 45 40 41 42 39 38 37
+ */
+static void cpc925_mc_get_pfn(struct mem_ctl_info *mci, u32 mear,
+ unsigned long *pfn, unsigned long *offset, int *csrow)
+{
+ u32 bcnt, rank, col, bank, row;
+ u32 c;
+ unsigned long pa;
+ int i;
+
+ bcnt = (mear & MEAR_BCNT_MASK) >> MEAR_BCNT_SHIFT;
+ rank = (mear & MEAR_RANK_MASK) >> MEAR_RANK_SHIFT;
+ col = (mear & MEAR_COL_MASK) >> MEAR_COL_SHIFT;
+ bank = (mear & MEAR_BANK_MASK) >> MEAR_BANK_SHIFT;
+ row = mear & MEAR_ROW_MASK;
+
+ *csrow = rank;
+
+#ifdef CONFIG_EDAC_DEBUG
+ if (mci->csrows[rank].first_page == 0) {
+ cpc925_mc_printk(mci, KERN_ERR, "ECC occurs in a "
+ "non-populated csrow, broken hardware?\n");
+ return;
+ }
+#endif
+
+ /* Revert csrow number */
+ pa = mci->csrows[rank].first_page << PAGE_SHIFT;
+
+ /* Revert column address */
+ col += bcnt;
+ for (i = 0; i < 11; i++) {
+ c = col & 0x1;
+ col >>= 1;
+ pa |= c << (14 - i);
+ }
+
+ /* Revert bank address */
+ pa |= bank << 19;
+
+ /* Revert row address, in 4 steps */
+ for (i = 0; i < 3; i++) {
+ c = row & 0x1;
+ row >>= 1;
+ pa |= c << (26 - i);
+ }
+
+ for (i = 0; i < 3; i++) {
+ c = row & 0x1;
+ row >>= 1;
+ pa |= c << (21 + i);
+ }
+
+ for (i = 0; i < 4; i++) {
+ c = row & 0x1;
+ row >>= 1;
+ pa |= c << (18 - i);
+ }
+
+ for (i = 0; i < 3; i++) {
+ c = row & 0x1;
+ row >>= 1;
+ pa |= c << (29 - i);
+ }
+
+ *offset = pa & (PAGE_SIZE - 1);
+ *pfn = pa >> PAGE_SHIFT;
+
+ debugf0("%s: ECC physical address 0x%lx\n", __func__, pa);
+}
+
+static int cpc925_mc_find_channel(struct mem_ctl_info *mci, u16 syndrome)
+{
+ if ((syndrome & MESR_ECC_SYN_H_MASK) == 0)
+ return 0;
+
+ if ((syndrome & MESR_ECC_SYN_L_MASK) == 0)
+ return 1;
+
+ cpc925_mc_printk(mci, KERN_INFO, "Unexpected syndrome value: 0x%x\n",
+ syndrome);
+ return 1;
+}
+
+/* Check memory controller registers for ECC errors */
+static void cpc925_mc_check(struct mem_ctl_info *mci)
+{
+ struct cpc925_mc_pdata *pdata = mci->pvt_info;
+ u32 apiexcp;
+ u32 mear;
+ u32 mesr;
+ u16 syndrome;
+ unsigned long pfn = 0, offset = 0;
+ int csrow = 0, channel = 0;
+
+ /* APIEXCP is cleared when read */
+ apiexcp = __raw_readl(pdata->vbase + REG_APIEXCP_OFFSET);
+ if ((apiexcp & ECC_EXCP_DETECTED) == 0)
+ return;
+
+ mesr = __raw_readl(pdata->vbase + REG_MESR_OFFSET);
+ syndrome = mesr | (MESR_ECC_SYN_H_MASK | MESR_ECC_SYN_L_MASK);
+
+ mear = __raw_readl(pdata->vbase + REG_MEAR_OFFSET);
+
+ /* Revert column/row addresses into page frame number, etc */
+ cpc925_mc_get_pfn(mci, mear, &pfn, &offset, &csrow);
+
+ if (apiexcp & UECC_EXCP_DETECTED) {
+ cpc925_mc_printk(mci, KERN_INFO, "DRAM UECC Fault\n");
+ channel = cpc925_mc_find_channel(mci, syndrome);
+ edac_mc_handle_ce(mci, pfn, offset, syndrome,
+ csrow, channel, mci->ctl_name);
+ }
+
+ if (apiexcp & CECC_EXCP_DETECTED) {
+ cpc925_mc_printk(mci, KERN_INFO, "DRAM CECC Fault\n");
+ edac_mc_handle_ue(mci, pfn, offset,
+ csrow, mci->ctl_name);
+ }
+
+ cpc925_mc_printk(mci, KERN_INFO, "Dump registers:\n");
+ cpc925_mc_printk(mci, KERN_INFO, "APIMASK 0x%08x\n",
+ __raw_readl(pdata->vbase + REG_APIMASK_OFFSET));
+ cpc925_mc_printk(mci, KERN_INFO, "APIEXCP 0x%08x\n",
+ apiexcp);
+ cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Ctrl 0x%08x\n",
+ __raw_readl(pdata->vbase + REG_MSCR_OFFSET));
+ cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge Start 0x%08x\n",
+ __raw_readl(pdata->vbase + REG_MSRSR_OFFSET));
+ cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Rge End 0x%08x\n",
+ __raw_readl(pdata->vbase + REG_MSRER_OFFSET));
+ cpc925_mc_printk(mci, KERN_INFO, "Mem Scrub Pattern 0x%08x\n",
+ __raw_readl(pdata->vbase + REG_MSPR_OFFSET));
+ cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Ctrl 0x%08x\n",
+ __raw_readl(pdata->vbase + REG_MCCR_OFFSET));
+ cpc925_mc_printk(mci, KERN_INFO, "Mem Chk Rge End 0x%08x\n",
+ __raw_readl(pdata->vbase + REG_MCRER_OFFSET));
+ cpc925_mc_printk(mci, KERN_INFO, "Mem Err Address 0x%08x\n",
+ mesr);
+ cpc925_mc_printk(mci, KERN_INFO, "Mem Err Syndrome 0x%08x\n",
+ syndrome);
+}
+
+/******************** CPU err device********************************/
+/* Enable CPU Errors detection */
+static void cpc925_cpu_init(struct cpc925_dev_info *dev_info)
+{
+ u32 apimask;
+
+ apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
+ if ((apimask & CPU_MASK_ENABLE) == 0) {
+ apimask |= CPU_MASK_ENABLE;
+ __raw_writel(apimask, dev_info->vbase + REG_APIMASK_OFFSET);
+ }
+}
+
+/* Disable CPU Errors detection */
+static void cpc925_cpu_exit(struct cpc925_dev_info *dev_info)
+{
+ /*
+ * WARNING:
+ * We are supposed to clear the CPU error detection bits,
+ * and it will be no problem to do so. However, once they
+ * are cleared here if we want to re-install CPC925 EDAC
+ * module later, setting them up in cpc925_cpu_init() will
+ * trigger machine check exception.
+ * Also, it's ok to leave CPU error detection bits enabled,
+ * since they are reset to 1 by default.
+ */
+
+ return;
+}
+
+/* Check for CPU Errors */
+static void cpc925_cpu_check(struct edac_device_ctl_info *edac_dev)
+{
+ struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
+ u32 apiexcp;
+ u32 apimask;
+
+ /* APIEXCP is cleared when read */
+ apiexcp = __raw_readl(dev_info->vbase + REG_APIEXCP_OFFSET);
+ if ((apiexcp & CPU_EXCP_DETECTED) == 0)
+ return;
+
+ apimask = __raw_readl(dev_info->vbase + REG_APIMASK_OFFSET);
+ cpc925_printk(KERN_INFO, "Processor Interface Fault\n"
+ "Processor Interface register dump:\n");
+ cpc925_printk(KERN_INFO, "APIMASK 0x%08x\n", apimask);
+ cpc925_printk(KERN_INFO, "APIEXCP 0x%08x\n", apiexcp);
+
+ edac_device_handle_ue(edac_dev, 0, 0, edac_dev->ctl_name);
+}
+
+/******************** HT Link err device****************************/
+/* Enable HyperTransport Link Error detection */
+static void cpc925_htlink_init(struct cpc925_dev_info *dev_info)
+{
+ u32 ht_errctrl;
+
+ ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
+ if ((ht_errctrl & HT_ERRCTRL_ENABLE) == 0) {
+ ht_errctrl |= HT_ERRCTRL_ENABLE;
+ __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
+ }
+}
+
+/* Disable HyperTransport Link Error detection */
+static void cpc925_htlink_exit(struct cpc925_dev_info *dev_info)
+{
+ u32 ht_errctrl;
+
+ ht_errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
+ ht_errctrl &= ~HT_ERRCTRL_ENABLE;
+ __raw_writel(ht_errctrl, dev_info->vbase + REG_ERRCTRL_OFFSET);
+}
+
+/* Check for HyperTransport Link errors */
+static void cpc925_htlink_check(struct edac_device_ctl_info *edac_dev)
+{
+ struct cpc925_dev_info *dev_info = edac_dev->pvt_info;
+ u32 brgctrl = __raw_readl(dev_info->vbase + REG_BRGCTRL_OFFSET);
+ u32 linkctrl = __raw_readl(dev_info->vbase + REG_LINKCTRL_OFFSET);
+ u32 errctrl = __raw_readl(dev_info->vbase + REG_ERRCTRL_OFFSET);
+ u32 linkerr = __raw_readl(dev_info->vbase + REG_LINKERR_OFFSET);
+
+ if (!((brgctrl & BRGCTRL_DETSERR) ||
+ (linkctrl & HT_LINKCTRL_DETECTED) ||
+ (errctrl & HT_ERRCTRL_DETECTED) ||
+ (linkerr & HT_LINKERR_DETECTED)))
+ return;
+
+ cpc925_printk(KERN_INFO, "HT Link Fault\n"
+ "HT register dump:\n");
+ cpc925_printk(KERN_INFO, "Bridge Ctrl 0x%08x\n",
+ brgctrl);
+ cpc925_printk(KERN_INFO, "Link Config Ctrl 0x%08x\n",
+ linkctrl);
+ cpc925_printk(KERN_INFO, "Error Enum and Ctrl 0x%08x\n",
+ errctrl);
+ cpc925_printk(KERN_INFO, "Link Error 0x%08x\n",
+ linkerr);
+
+ /* Clear by write 1 */
+ if (brgctrl & BRGCTRL_DETSERR)
+ __raw_writel(BRGCTRL_DETSERR,
+ dev_info->vbase + REG_BRGCTRL_OFFSET);
+
+ if (linkctrl & HT_LINKCTRL_DETECTED)
+ __raw_writel(HT_LINKCTRL_DETECTED,
+ dev_info->vbase + REG_LINKCTRL_OFFSET);
+
+ /* Initiate Secondary Bus Reset to clear the chain failure */
+ if (errctrl & ERRCTRL_CHN_FAL)
+ __raw_writel(BRGCTRL_SECBUSRESET,
+ dev_info->vbase + REG_BRGCTRL_OFFSET);
+
+ if (errctrl & ERRCTRL_RSP_ERR)
+ __raw_writel(ERRCTRL_RSP_ERR,
+ dev_info->vbase + REG_ERRCTRL_OFFSET);
+
+ if (linkerr & HT_LINKERR_DETECTED)
+ __raw_writel(HT_LINKERR_DETECTED,
+ dev_info->vbase + REG_LINKERR_OFFSET);
+
+ edac_device_handle_ce(edac_dev, 0, 0, edac_dev->ctl_name);
+}
+
+static struct cpc925_dev_info cpc925_devs[] = {
+ {
+ .ctl_name = CPC925_CPU_ERR_DEV,
+ .init = cpc925_cpu_init,
+ .exit = cpc925_cpu_exit,
+ .check = cpc925_cpu_check,
+ },
+ {
+ .ctl_name = CPC925_HT_LINK_DEV,
+ .init = cpc925_htlink_init,
+ .exit = cpc925_htlink_exit,
+ .check = cpc925_htlink_check,
+ },
+ {0}, /* Terminated by NULL */
+};
+
+/*
+ * Add CPU Err detection and HyperTransport Link Err detection
+ * as common "edac_device", they have no corresponding device
+ * nodes in the Open Firmware DTB and we have to add platform
+ * devices for them. Also, they will share the MMIO with that
+ * of memory controller.
+ */
+static void cpc925_add_edac_devices(void __iomem *vbase)
+{
+ struct cpc925_dev_info *dev_info;
+
+ if (!vbase) {
+ cpc925_printk(KERN_ERR, "MMIO not established yet\n");
+ return;
+ }
+
+ for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
+ dev_info->vbase = vbase;
+ dev_info->pdev = platform_device_register_simple(
+ dev_info->ctl_name, 0, NULL, 0);
+ if (IS_ERR(dev_info->pdev)) {
+ cpc925_printk(KERN_ERR,
+ "Can't register platform device for %s\n",
+ dev_info->ctl_name);
+ continue;
+ }
+
+ /*
+ * Don't have to allocate private structure but
+ * make use of cpc925_devs[] instead.
+ */
+ dev_info->edac_idx = edac_device_alloc_index();
+ dev_info->edac_dev =
+ edac_device_alloc_ctl_info(0, dev_info->ctl_name,
+ 1, NULL, 0, 0, NULL, 0, dev_info->edac_idx);
+ if (!dev_info->edac_dev) {
+ cpc925_printk(KERN_ERR, "No memory for edac device\n");
+ goto err1;
+ }
+
+ dev_info->edac_dev->pvt_info = dev_info;
+ dev_info->edac_dev->dev = &dev_info->pdev->dev;
+ dev_info->edac_dev->ctl_name = dev_info->ctl_name;
+ dev_info->edac_dev->mod_name = CPC925_EDAC_MOD_STR;
+ dev_info->edac_dev->dev_name = dev_name(&dev_info->pdev->dev);
+
+ if (edac_op_state == EDAC_OPSTATE_POLL)
+ dev_info->edac_dev->edac_check = dev_info->check;
+
+ if (dev_info->init)
+ dev_info->init(dev_info);
+
+ if (edac_device_add_device(dev_info->edac_dev) > 0) {
+ cpc925_printk(KERN_ERR,
+ "Unable to add edac device for %s\n",
+ dev_info->ctl_name);
+ goto err2;
+ }
+
+ debugf0("%s: Successfully added edac device for %s\n",
+ __func__, dev_info->ctl_name);
+
+ continue;
+
+err2:
+ if (dev_info->exit)
+ dev_info->exit(dev_info);
+ edac_device_free_ctl_info(dev_info->edac_dev);
+err1:
+ platform_device_unregister(dev_info->pdev);
+ }
+}
+
+/*
+ * Delete the common "edac_device" for CPU Err Detection
+ * and HyperTransport Link Err Detection
+ */
+static void cpc925_del_edac_devices(void)
+{
+ struct cpc925_dev_info *dev_info;
+
+ for (dev_info = &cpc925_devs[0]; dev_info->init; dev_info++) {
+ if (dev_info->edac_dev) {
+ edac_device_del_device(dev_info->edac_dev->dev);
+ edac_device_free_ctl_info(dev_info->edac_dev);
+ platform_device_unregister(dev_info->pdev);
+ }
+
+ if (dev_info->exit)
+ dev_info->exit(dev_info);
+
+ debugf0("%s: Successfully deleted edac device for %s\n",
+ __func__, dev_info->ctl_name);
+ }
+}
+
+/* Convert current back-ground scrub rate into byte/sec bandwith */
+static int cpc925_get_sdram_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
+{
+ struct cpc925_mc_pdata *pdata = mci->pvt_info;
+ u32 mscr;
+ u8 si;
+
+ mscr = __raw_readl(pdata->vbase + REG_MSCR_OFFSET);
+ si = (mscr & MSCR_SI_MASK) >> MSCR_SI_SHIFT;
+
+ debugf0("%s, Mem Scrub Ctrl Register 0x%x\n", __func__, mscr);
+
+ if (((mscr & MSCR_SCRUB_MOD_MASK) != MSCR_BACKGR_SCRUB) ||
+ (si == 0)) {
+ cpc925_mc_printk(mci, KERN_INFO, "Scrub mode not enabled\n");
+ *bw = 0;
+ } else
+ *bw = CPC925_SCRUB_BLOCK_SIZE * 0xFA67 / si;
+
+ return 0;
+}
+
+/* Return 0 for single channel; 1 for dual channel */
+static int cpc925_mc_get_channels(void __iomem *vbase)
+{
+ int dual = 0;
+ u32 mbcr;
+
+ mbcr = __raw_readl(vbase + REG_MBCR_OFFSET);
+
+ /*
+ * Dual channel only when 128-bit wide physical bus
+ * and 128-bit configuration.
+ */
+ if (((mbcr & MBCR_64BITCFG_MASK) == 0) &&
+ ((mbcr & MBCR_64BITBUS_MASK) == 0))
+ dual = 1;
+
+ debugf0("%s: %s channel\n", __func__,
+ (dual > 0) ? "Dual" : "Single");
+
+ return dual;
+}
+
+static int __devinit cpc925_probe(struct platform_device *pdev)
+{
+ struct mem_ctl_info *mci;
+ void __iomem *vbase;
+ struct cpc925_mc_pdata *pdata;
+ struct resource *r;
+ int res = 0, nr_channels;
+
+ debugf0("%s: %s platform device found!\n", __func__, pdev->name);
+
+ if (!devres_open_group(&pdev->dev, cpc925_probe, GFP_KERNEL)) {
+ res = -ENOMEM;
+ goto out;
+ }
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r) {
+ cpc925_printk(KERN_ERR, "Unable to get resource\n");
+ res = -ENOENT;
+ goto err1;
+ }
+
+ if (!devm_request_mem_region(&pdev->dev,
+ r->start,
+ r->end - r->start + 1,
+ pdev->name)) {
+ cpc925_printk(KERN_ERR, "Unable to request mem region\n");
+ res = -EBUSY;
+ goto err1;
+ }
+
+ vbase = devm_ioremap(&pdev->dev, r->start, r->end - r->start + 1);
+ if (!vbase) {
+ cpc925_printk(KERN_ERR, "Unable to ioremap device\n");
+ res = -ENOMEM;
+ goto err2;
+ }
+
+ nr_channels = cpc925_mc_get_channels(vbase);
+ mci = edac_mc_alloc(sizeof(struct cpc925_mc_pdata),
+ CPC925_NR_CSROWS, nr_channels + 1, edac_mc_idx);
+ if (!mci) {
+ cpc925_printk(KERN_ERR, "No memory for mem_ctl_info\n");
+ res = -ENOMEM;
+ goto err2;
+ }
+
+ pdata = mci->pvt_info;
+ pdata->vbase = vbase;
+ pdata->edac_idx = edac_mc_idx++;
+ pdata->name = pdev->name;
+
+ mci->dev = &pdev->dev;
+ platform_set_drvdata(pdev, mci);
+ mci->dev_name = dev_name(&pdev->dev);
+ mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR;
+ mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
+ mci->edac_cap = EDAC_FLAG_SECDED;
+ mci->mod_name = CPC925_EDAC_MOD_STR;
+ mci->mod_ver = CPC925_EDAC_REVISION;
+ mci->ctl_name = pdev->name;
+
+ if (edac_op_state == EDAC_OPSTATE_POLL)
+ mci->edac_check = cpc925_mc_check;
+
+ mci->ctl_page_to_phys = NULL;
+ mci->scrub_mode = SCRUB_SW_SRC;
+ mci->set_sdram_scrub_rate = NULL;
+ mci->get_sdram_scrub_rate = cpc925_get_sdram_scrub_rate;
+
+ cpc925_init_csrows(mci);
+
+ /* Setup memory controller registers */
+ cpc925_mc_init(mci);
+
+ if (edac_mc_add_mc(mci) > 0) {
+ cpc925_mc_printk(mci, KERN_ERR, "Failed edac_mc_add_mc()\n");
+ goto err3;
+ }
+
+ cpc925_add_edac_devices(vbase);
+
+ /* get this far and it's successful */
+ debugf0("%s: success\n", __func__);
+
+ res = 0;
+ goto out;
+
+err3:
+ cpc925_mc_exit(mci);
+ edac_mc_free(mci);
+err2:
+ devm_release_mem_region(&pdev->dev, r->start, r->end-r->start+1);
+err1:
+ devres_release_group(&pdev->dev, cpc925_probe);
+out:
+ return res;
+}
+
+static int cpc925_remove(struct platform_device *pdev)
+{
+ struct mem_ctl_info *mci = platform_get_drvdata(pdev);
+
+ /*
+ * Delete common edac devices before edac mc, because
+ * the former share the MMIO of the latter.
+ */
+ cpc925_del_edac_devices();
+ cpc925_mc_exit(mci);
+
+ edac_mc_del_mc(&pdev->dev);
+ edac_mc_free(mci);
+
+ return 0;
+}
+
+static struct platform_driver cpc925_edac_driver = {
+ .probe = cpc925_probe,
+ .remove = cpc925_remove,
+ .driver = {
+ .name = "cpc925_edac",
+ }
+};
+
+static int __init cpc925_edac_init(void)
+{
+ int ret = 0;
+
+ printk(KERN_INFO "IBM CPC925 EDAC driver " CPC925_EDAC_REVISION "\n");
+ printk(KERN_INFO "\t(c) 2008 Wind River Systems, Inc\n");
+
+ /* Only support POLL mode so far */
+ edac_op_state = EDAC_OPSTATE_POLL;
+
+ ret = platform_driver_register(&cpc925_edac_driver);
+ if (ret) {
+ printk(KERN_WARNING "Failed to register %s\n",
+ CPC925_EDAC_MOD_STR);
+ }
+
+ return ret;
+}
+
+static void __exit cpc925_edac_exit(void)
+{
+ platform_driver_unregister(&cpc925_edac_driver);
+}
+
+module_init(cpc925_edac_init);
+module_exit(cpc925_edac_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Cao Qingtao <qingtao.cao@windriver.com>");
+MODULE_DESCRIPTION("IBM CPC925 Bridge and MC EDAC kernel module");