Merge tag 'ieee802154-for-davem-2021-08-12' of git://git.kernel.org/pub/scm/linux...
[platform/kernel/linux-rpi.git] / drivers / edac / ti_edac.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
4  *
5  * Texas Instruments DDR3 ECC error correction and detection driver
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms and conditions of the GNU General Public License,
9  * version 2, as published by the Free Software Foundation.
10  *
11  * This program is distributed in the hope it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
14  * more details.
15  *
16  * You should have received a copy of the GNU General Public License along with
17  * this program.  If not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include <linux/init.h>
21 #include <linux/edac.h>
22 #include <linux/io.h>
23 #include <linux/interrupt.h>
24 #include <linux/of_address.h>
25 #include <linux/of_device.h>
26 #include <linux/module.h>
27
28 #include "edac_module.h"
29
30 /* EMIF controller registers */
31 #define EMIF_SDRAM_CONFIG               0x008
32 #define EMIF_IRQ_STATUS                 0x0ac
33 #define EMIF_IRQ_ENABLE_SET             0x0b4
34 #define EMIF_ECC_CTRL                   0x110
35 #define EMIF_1B_ECC_ERR_CNT             0x130
36 #define EMIF_1B_ECC_ERR_THRSH           0x134
37 #define EMIF_1B_ECC_ERR_ADDR_LOG        0x13c
38 #define EMIF_2B_ECC_ERR_ADDR_LOG        0x140
39
40 /* Bit definitions for EMIF_SDRAM_CONFIG */
41 #define SDRAM_TYPE_SHIFT                29
42 #define SDRAM_TYPE_MASK                 GENMASK(31, 29)
43 #define SDRAM_TYPE_DDR3                 (3 << SDRAM_TYPE_SHIFT)
44 #define SDRAM_TYPE_DDR2                 (2 << SDRAM_TYPE_SHIFT)
45 #define SDRAM_NARROW_MODE_MASK          GENMASK(15, 14)
46 #define SDRAM_K2_NARROW_MODE_SHIFT      12
47 #define SDRAM_K2_NARROW_MODE_MASK       GENMASK(13, 12)
48 #define SDRAM_ROWSIZE_SHIFT             7
49 #define SDRAM_ROWSIZE_MASK              GENMASK(9, 7)
50 #define SDRAM_IBANK_SHIFT               4
51 #define SDRAM_IBANK_MASK                GENMASK(6, 4)
52 #define SDRAM_K2_IBANK_SHIFT            5
53 #define SDRAM_K2_IBANK_MASK             GENMASK(6, 5)
54 #define SDRAM_K2_EBANK_SHIFT            3
55 #define SDRAM_K2_EBANK_MASK             BIT(SDRAM_K2_EBANK_SHIFT)
56 #define SDRAM_PAGESIZE_SHIFT            0
57 #define SDRAM_PAGESIZE_MASK             GENMASK(2, 0)
58 #define SDRAM_K2_PAGESIZE_SHIFT         0
59 #define SDRAM_K2_PAGESIZE_MASK          GENMASK(1, 0)
60
61 #define EMIF_1B_ECC_ERR_THRSH_SHIFT     24
62
63 /* IRQ bit definitions */
64 #define EMIF_1B_ECC_ERR                 BIT(5)
65 #define EMIF_2B_ECC_ERR                 BIT(4)
66 #define EMIF_WR_ECC_ERR                 BIT(3)
67 #define EMIF_SYS_ERR                    BIT(0)
68 /* Bit 31 enables ECC and 28 enables RMW */
69 #define ECC_ENABLED                     (BIT(31) | BIT(28))
70
71 #define EDAC_MOD_NAME                   "ti-emif-edac"
72
73 enum {
74         EMIF_TYPE_DRA7,
75         EMIF_TYPE_K2
76 };
77
78 struct ti_edac {
79         void __iomem *reg;
80 };
81
82 static u32 ti_edac_readl(struct ti_edac *edac, u16 offset)
83 {
84         return readl_relaxed(edac->reg + offset);
85 }
86
87 static void ti_edac_writel(struct ti_edac *edac, u32 val, u16 offset)
88 {
89         writel_relaxed(val, edac->reg + offset);
90 }
91
92 static irqreturn_t ti_edac_isr(int irq, void *data)
93 {
94         struct mem_ctl_info *mci = data;
95         struct ti_edac *edac = mci->pvt_info;
96         u32 irq_status;
97         u32 err_addr;
98         int err_count;
99
100         irq_status = ti_edac_readl(edac, EMIF_IRQ_STATUS);
101
102         if (irq_status & EMIF_1B_ECC_ERR) {
103                 err_addr = ti_edac_readl(edac, EMIF_1B_ECC_ERR_ADDR_LOG);
104                 err_count = ti_edac_readl(edac, EMIF_1B_ECC_ERR_CNT);
105                 ti_edac_writel(edac, err_count, EMIF_1B_ECC_ERR_CNT);
106                 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, err_count,
107                                      err_addr >> PAGE_SHIFT,
108                                      err_addr & ~PAGE_MASK, -1, 0, 0, 0,
109                                      mci->ctl_name, "1B");
110         }
111
112         if (irq_status & EMIF_2B_ECC_ERR) {
113                 err_addr = ti_edac_readl(edac, EMIF_2B_ECC_ERR_ADDR_LOG);
114                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
115                                      err_addr >> PAGE_SHIFT,
116                                      err_addr & ~PAGE_MASK, -1, 0, 0, 0,
117                                      mci->ctl_name, "2B");
118         }
119
120         if (irq_status & EMIF_WR_ECC_ERR)
121                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
122                                      0, 0, -1, 0, 0, 0,
123                                      mci->ctl_name, "WR");
124
125         ti_edac_writel(edac, irq_status, EMIF_IRQ_STATUS);
126
127         return IRQ_HANDLED;
128 }
129
130 static void ti_edac_setup_dimm(struct mem_ctl_info *mci, u32 type)
131 {
132         struct dimm_info *dimm;
133         struct ti_edac *edac = mci->pvt_info;
134         int bits;
135         u32 val;
136         u32 memsize;
137
138         dimm = edac_get_dimm(mci, 0, 0, 0);
139
140         val = ti_edac_readl(edac, EMIF_SDRAM_CONFIG);
141
142         if (type == EMIF_TYPE_DRA7) {
143                 bits = ((val & SDRAM_PAGESIZE_MASK) >> SDRAM_PAGESIZE_SHIFT) + 8;
144                 bits += ((val & SDRAM_ROWSIZE_MASK) >> SDRAM_ROWSIZE_SHIFT) + 9;
145                 bits += (val & SDRAM_IBANK_MASK) >> SDRAM_IBANK_SHIFT;
146
147                 if (val & SDRAM_NARROW_MODE_MASK) {
148                         bits++;
149                         dimm->dtype = DEV_X16;
150                 } else {
151                         bits += 2;
152                         dimm->dtype = DEV_X32;
153                 }
154         } else {
155                 bits = 16;
156                 bits += ((val & SDRAM_K2_PAGESIZE_MASK) >>
157                         SDRAM_K2_PAGESIZE_SHIFT) + 8;
158                 bits += (val & SDRAM_K2_IBANK_MASK) >> SDRAM_K2_IBANK_SHIFT;
159                 bits += (val & SDRAM_K2_EBANK_MASK) >> SDRAM_K2_EBANK_SHIFT;
160
161                 val = (val & SDRAM_K2_NARROW_MODE_MASK) >>
162                         SDRAM_K2_NARROW_MODE_SHIFT;
163                 switch (val) {
164                 case 0:
165                         bits += 3;
166                         dimm->dtype = DEV_X64;
167                         break;
168                 case 1:
169                         bits += 2;
170                         dimm->dtype = DEV_X32;
171                         break;
172                 case 2:
173                         bits++;
174                         dimm->dtype = DEV_X16;
175                         break;
176                 }
177         }
178
179         memsize = 1 << bits;
180
181         dimm->nr_pages = memsize >> PAGE_SHIFT;
182         dimm->grain = 4;
183         if ((val & SDRAM_TYPE_MASK) == SDRAM_TYPE_DDR2)
184                 dimm->mtype = MEM_DDR2;
185         else
186                 dimm->mtype = MEM_DDR3;
187
188         val = ti_edac_readl(edac, EMIF_ECC_CTRL);
189         if (val & ECC_ENABLED)
190                 dimm->edac_mode = EDAC_SECDED;
191         else
192                 dimm->edac_mode = EDAC_NONE;
193 }
194
195 static const struct of_device_id ti_edac_of_match[] = {
196         { .compatible = "ti,emif-keystone", .data = (void *)EMIF_TYPE_K2 },
197         { .compatible = "ti,emif-dra7xx", .data = (void *)EMIF_TYPE_DRA7 },
198         {},
199 };
200 MODULE_DEVICE_TABLE(of, ti_edac_of_match);
201
202 static int _emif_get_id(struct device_node *node)
203 {
204         struct device_node *np;
205         const __be32 *addrp;
206         u32 addr, my_addr;
207         int my_id = 0;
208
209         addrp = of_get_address(node, 0, NULL, NULL);
210         my_addr = (u32)of_translate_address(node, addrp);
211
212         for_each_matching_node(np, ti_edac_of_match) {
213                 if (np == node)
214                         continue;
215
216                 addrp = of_get_address(np, 0, NULL, NULL);
217                 addr = (u32)of_translate_address(np, addrp);
218
219                 edac_printk(KERN_INFO, EDAC_MOD_NAME,
220                             "addr=%x, my_addr=%x\n",
221                             addr, my_addr);
222
223                 if (addr < my_addr)
224                         my_id++;
225         }
226
227         return my_id;
228 }
229
230 static int ti_edac_probe(struct platform_device *pdev)
231 {
232         int error_irq = 0, ret = -ENODEV;
233         struct device *dev = &pdev->dev;
234         struct resource *res;
235         void __iomem *reg;
236         struct mem_ctl_info *mci;
237         struct edac_mc_layer layers[1];
238         const struct of_device_id *id;
239         struct ti_edac *edac;
240         int emif_id;
241
242         id = of_match_device(ti_edac_of_match, &pdev->dev);
243         if (!id)
244                 return -ENODEV;
245
246         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
247         reg = devm_ioremap_resource(dev, res);
248         if (IS_ERR(reg)) {
249                 edac_printk(KERN_ERR, EDAC_MOD_NAME,
250                             "EMIF controller regs not defined\n");
251                 return PTR_ERR(reg);
252         }
253
254         layers[0].type = EDAC_MC_LAYER_ALL_MEM;
255         layers[0].size = 1;
256
257         /* Allocate ID number for our EMIF controller */
258         emif_id = _emif_get_id(pdev->dev.of_node);
259         if (emif_id < 0)
260                 return -EINVAL;
261
262         mci = edac_mc_alloc(emif_id, 1, layers, sizeof(*edac));
263         if (!mci)
264                 return -ENOMEM;
265
266         mci->pdev = &pdev->dev;
267         edac = mci->pvt_info;
268         edac->reg = reg;
269         platform_set_drvdata(pdev, mci);
270
271         mci->mtype_cap = MEM_FLAG_DDR3 | MEM_FLAG_DDR2;
272         mci->edac_ctl_cap = EDAC_FLAG_SECDED | EDAC_FLAG_NONE;
273         mci->mod_name = EDAC_MOD_NAME;
274         mci->ctl_name = id->compatible;
275         mci->dev_name = dev_name(&pdev->dev);
276
277         /* Setup memory layout */
278         ti_edac_setup_dimm(mci, (u32)(id->data));
279
280         /* add EMIF ECC error handler */
281         error_irq = platform_get_irq(pdev, 0);
282         if (error_irq < 0) {
283                 ret = error_irq;
284                 edac_printk(KERN_ERR, EDAC_MOD_NAME,
285                             "EMIF irq number not defined.\n");
286                 goto err;
287         }
288
289         ret = devm_request_irq(dev, error_irq, ti_edac_isr, 0,
290                                "emif-edac-irq", mci);
291         if (ret) {
292                 edac_printk(KERN_ERR, EDAC_MOD_NAME,
293                             "request_irq fail for EMIF EDAC irq\n");
294                 goto err;
295         }
296
297         ret = edac_mc_add_mc(mci);
298         if (ret) {
299                 edac_printk(KERN_ERR, EDAC_MOD_NAME,
300                             "Failed to register mci: %d.\n", ret);
301                 goto err;
302         }
303
304         /* Generate an interrupt with each 1b error */
305         ti_edac_writel(edac, 1 << EMIF_1B_ECC_ERR_THRSH_SHIFT,
306                        EMIF_1B_ECC_ERR_THRSH);
307
308         /* Enable interrupts */
309         ti_edac_writel(edac,
310                        EMIF_1B_ECC_ERR | EMIF_2B_ECC_ERR | EMIF_WR_ECC_ERR,
311                        EMIF_IRQ_ENABLE_SET);
312
313         return 0;
314
315 err:
316         edac_mc_free(mci);
317         return ret;
318 }
319
320 static int ti_edac_remove(struct platform_device *pdev)
321 {
322         struct mem_ctl_info *mci = platform_get_drvdata(pdev);
323
324         edac_mc_del_mc(&pdev->dev);
325         edac_mc_free(mci);
326
327         return 0;
328 }
329
330 static struct platform_driver ti_edac_driver = {
331         .probe = ti_edac_probe,
332         .remove = ti_edac_remove,
333         .driver = {
334                    .name = EDAC_MOD_NAME,
335                    .of_match_table = ti_edac_of_match,
336         },
337 };
338
339 module_platform_driver(ti_edac_driver);
340
341 MODULE_AUTHOR("Texas Instruments Inc.");
342 MODULE_DESCRIPTION("EDAC Driver for Texas Instruments DDR3 MC");
343 MODULE_LICENSE("GPL v2");