2 * Copyright 2011 Tilera Corporation. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
13 * Tilera-specific EDAC driver.
15 * This source code is derived from the following driver:
17 * Cell MIC driver for ECC counting
19 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/platform_device.h>
28 #include <linux/uaccess.h>
29 #include <linux/edac.h>
30 #include <hv/hypervisor.h>
31 #include <hv/drv_mshim_intf.h>
33 #include "edac_core.h"
35 #define DRV_NAME "tile-edac"
37 /* Number of cs_rows needed per memory controller on TILEPro. */
38 #define TILE_EDAC_NR_CSROWS 1
40 /* Number of channels per memory controller on TILEPro. */
41 #define TILE_EDAC_NR_CHANS 1
43 /* Granularity of reported error in bytes on TILEPro. */
44 #define TILE_EDAC_ERROR_GRAIN 8
46 /* TILE processor has multiple independent memory controllers. */
47 struct platform_device *mshim_pdev[TILE_MAX_MSHIMS];
49 struct tile_edac_priv {
50 int hv_devhdl; /* Hypervisor device handle. */
51 int node; /* Memory controller instance #. */
52 unsigned int ce_count; /*
53 * Correctable-error counter
58 static void tile_edac_check(struct mem_ctl_info *mci)
60 struct tile_edac_priv *priv = mci->pvt_info;
61 struct mshim_mem_error mem_error;
63 if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_error,
64 sizeof(struct mshim_mem_error), MSHIM_MEM_ERROR_OFF) !=
65 sizeof(struct mshim_mem_error)) {
66 pr_err(DRV_NAME ": MSHIM_MEM_ERROR_OFF pread failure.\n");
70 /* Check if the current error count is different from the saved one. */
71 if (mem_error.sbe_count != priv->ce_count) {
72 dev_dbg(mci->dev, "ECC CE err on node %d\n", priv->node);
73 priv->ce_count = mem_error.sbe_count;
74 edac_mc_handle_ce(mci, 0, 0, 0, 0, 0, mci->ctl_name);
79 * Initialize the 'csrows' table within the mci control structure with the
80 * addressing of memory.
82 static int __devinit tile_edac_init_csrows(struct mem_ctl_info *mci)
84 struct csrow_info *csrow = &mci->csrows[0];
85 struct tile_edac_priv *priv = mci->pvt_info;
86 struct mshim_mem_info mem_info;
88 if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_info,
89 sizeof(struct mshim_mem_info), MSHIM_MEM_INFO_OFF) !=
90 sizeof(struct mshim_mem_info)) {
91 pr_err(DRV_NAME ": MSHIM_MEM_INFO_OFF pread failure.\n");
96 csrow->edac_mode = EDAC_SECDED;
98 csrow->edac_mode = EDAC_NONE;
99 switch (mem_info.mem_type) {
101 csrow->mtype = MEM_DDR2;
105 csrow->mtype = MEM_DDR3;
112 csrow->first_page = 0;
113 csrow->nr_pages = mem_info.mem_size >> PAGE_SHIFT;
114 csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
115 csrow->grain = TILE_EDAC_ERROR_GRAIN;
116 csrow->dtype = DEV_UNKNOWN;
121 static int __devinit tile_edac_mc_probe(struct platform_device *pdev)
125 struct mem_ctl_info *mci;
126 struct tile_edac_priv *priv;
129 sprintf(hv_file, "mshim/%d", pdev->id);
130 hv_devhdl = hv_dev_open((HV_VirtAddr)hv_file, 0);
134 /* A TILE MC has a single channel and one chip-select row. */
135 mci = edac_mc_alloc(sizeof(struct tile_edac_priv),
136 TILE_EDAC_NR_CSROWS, TILE_EDAC_NR_CHANS, pdev->id);
139 priv = mci->pvt_info;
140 priv->node = pdev->id;
141 priv->hv_devhdl = hv_devhdl;
143 mci->dev = &pdev->dev;
144 mci->mtype_cap = MEM_FLAG_DDR2;
145 mci->edac_ctl_cap = EDAC_FLAG_SECDED;
147 mci->mod_name = DRV_NAME;
149 mci->ctl_name = "TILEGx_Memory_Controller";
151 mci->ctl_name = "TILEPro_Memory_Controller";
153 mci->dev_name = dev_name(&pdev->dev);
154 mci->edac_check = tile_edac_check;
157 * Initialize the MC control structure 'csrows' table
158 * with the mapping and control information.
160 if (tile_edac_init_csrows(mci)) {
161 /* No csrows found. */
162 mci->edac_cap = EDAC_FLAG_NONE;
164 mci->edac_cap = EDAC_FLAG_SECDED;
167 platform_set_drvdata(pdev, mci);
169 /* Register with EDAC core */
170 rc = edac_mc_add_mc(mci);
172 dev_err(&pdev->dev, "failed to register with EDAC core\n");
180 static int __devexit tile_edac_mc_remove(struct platform_device *pdev)
182 struct mem_ctl_info *mci = platform_get_drvdata(pdev);
184 edac_mc_del_mc(&pdev->dev);
190 static struct platform_driver tile_edac_mc_driver = {
193 .owner = THIS_MODULE,
195 .probe = tile_edac_mc_probe,
196 .remove = __devexit_p(tile_edac_mc_remove),
200 * Driver init routine.
202 static int __init tile_edac_init(void)
205 struct platform_device *pdev;
208 /* Only support POLL mode. */
209 edac_op_state = EDAC_OPSTATE_POLL;
211 err = platform_driver_register(&tile_edac_mc_driver);
215 for (i = 0; i < TILE_MAX_MSHIMS; i++) {
217 * Not all memory controllers are configured such as in the
218 * case of a simulator. So we register only those mshims
219 * that are configured by the hypervisor.
221 sprintf(hv_file, "mshim/%d", i);
222 if (hv_dev_open((HV_VirtAddr)hv_file, 0) < 0)
225 pdev = platform_device_register_simple(DRV_NAME, i, NULL, 0);
228 mshim_pdev[i] = pdev;
233 platform_driver_unregister(&tile_edac_mc_driver);
240 * Driver cleanup routine.
242 static void __exit tile_edac_exit(void)
246 for (i = 0; i < TILE_MAX_MSHIMS; i++) {
247 struct platform_device *pdev = mshim_pdev[i];
251 platform_set_drvdata(pdev, NULL);
252 platform_device_unregister(pdev);
254 platform_driver_unregister(&tile_edac_mc_driver);
257 module_init(tile_edac_init);
258 module_exit(tile_edac_exit);