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Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +05301/*
2 * Copyright 2011 Freescale Semiconductor, Inc
3 *
4 * Freescale Integrated Flash Controller
5 *
6 * Author: Dipen Dudhat <Dipen.Dudhat@freescale.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +053022#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/compiler.h>
25#include <linux/spinlock.h>
26#include <linux/types.h>
27#include <linux/slab.h>
28#include <linux/io.h>
29#include <linux/of.h>
30#include <linux/of_device.h>
31#include <linux/platform_device.h>
Prabhakar Kushwahad2ae2e22014-01-17 11:15:16 +053032#include <linux/fsl_ifc.h>
Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +053033#include <asm/prom.h>
Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +053034
35struct fsl_ifc_ctrl *fsl_ifc_ctrl_dev;
36EXPORT_SYMBOL(fsl_ifc_ctrl_dev);
37
38/*
39 * convert_ifc_address - convert the base address
40 * @addr_base: base address of the memory bank
41 */
42unsigned int convert_ifc_address(phys_addr_t addr_base)
43{
44 return addr_base & CSPR_BA;
45}
46EXPORT_SYMBOL(convert_ifc_address);
47
48/*
49 * fsl_ifc_find - find IFC bank
50 * @addr_base: base address of the memory bank
51 *
52 * This function walks IFC banks comparing "Base address" field of the CSPR
53 * registers with the supplied addr_base argument. When bases match this
54 * function returns bank number (starting with 0), otherwise it returns
55 * appropriate errno value.
56 */
57int fsl_ifc_find(phys_addr_t addr_base)
58{
59 int i = 0;
60
61 if (!fsl_ifc_ctrl_dev || !fsl_ifc_ctrl_dev->regs)
62 return -ENODEV;
63
Aaron Sierra09691662014-08-26 18:18:33 -050064 for (i = 0; i < fsl_ifc_ctrl_dev->banks; i++) {
Kim Phillips8998a032012-11-30 17:35:01 -060065 u32 cspr = in_be32(&fsl_ifc_ctrl_dev->regs->cspr_cs[i].cspr);
Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +053066 if (cspr & CSPR_V && (cspr & CSPR_BA) ==
67 convert_ifc_address(addr_base))
68 return i;
69 }
70
71 return -ENOENT;
72}
73EXPORT_SYMBOL(fsl_ifc_find);
74
Greg Kroah-Hartmancad5cef2012-12-21 14:04:10 -080075static int fsl_ifc_ctrl_init(struct fsl_ifc_ctrl *ctrl)
Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +053076{
77 struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
78
79 /*
80 * Clear all the common status and event registers
81 */
82 if (in_be32(&ifc->cm_evter_stat) & IFC_CM_EVTER_STAT_CSER)
83 out_be32(&ifc->cm_evter_stat, IFC_CM_EVTER_STAT_CSER);
84
85 /* enable all error and events */
86 out_be32(&ifc->cm_evter_en, IFC_CM_EVTER_EN_CSEREN);
87
88 /* enable all error and event interrupts */
89 out_be32(&ifc->cm_evter_intr_en, IFC_CM_EVTER_INTR_EN_CSERIREN);
90 out_be32(&ifc->cm_erattr0, 0x0);
91 out_be32(&ifc->cm_erattr1, 0x0);
92
93 return 0;
94}
95
96static int fsl_ifc_ctrl_remove(struct platform_device *dev)
97{
98 struct fsl_ifc_ctrl *ctrl = dev_get_drvdata(&dev->dev);
99
100 free_irq(ctrl->nand_irq, ctrl);
101 free_irq(ctrl->irq, ctrl);
102
103 irq_dispose_mapping(ctrl->nand_irq);
104 irq_dispose_mapping(ctrl->irq);
105
106 iounmap(ctrl->regs);
107
108 dev_set_drvdata(&dev->dev, NULL);
109 kfree(ctrl);
110
111 return 0;
112}
113
114/*
115 * NAND events are split between an operational interrupt which only
116 * receives OPC, and an error interrupt that receives everything else,
117 * including non-NAND errors. Whichever interrupt gets to it first
118 * records the status and wakes the wait queue.
119 */
120static DEFINE_SPINLOCK(nand_irq_lock);
121
122static u32 check_nand_stat(struct fsl_ifc_ctrl *ctrl)
123{
124 struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
125 unsigned long flags;
126 u32 stat;
127
128 spin_lock_irqsave(&nand_irq_lock, flags);
129
130 stat = in_be32(&ifc->ifc_nand.nand_evter_stat);
131 if (stat) {
132 out_be32(&ifc->ifc_nand.nand_evter_stat, stat);
133 ctrl->nand_stat = stat;
134 wake_up(&ctrl->nand_wait);
135 }
136
137 spin_unlock_irqrestore(&nand_irq_lock, flags);
138
139 return stat;
140}
141
142static irqreturn_t fsl_ifc_nand_irq(int irqno, void *data)
143{
144 struct fsl_ifc_ctrl *ctrl = data;
145
146 if (check_nand_stat(ctrl))
147 return IRQ_HANDLED;
148
149 return IRQ_NONE;
150}
151
152/*
153 * NOTE: This interrupt is used to report ifc events of various kinds,
154 * such as transaction errors on the chipselects.
155 */
156static irqreturn_t fsl_ifc_ctrl_irq(int irqno, void *data)
157{
158 struct fsl_ifc_ctrl *ctrl = data;
159 struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
160 u32 err_axiid, err_srcid, status, cs_err, err_addr;
161 irqreturn_t ret = IRQ_NONE;
162
163 /* read for chip select error */
164 cs_err = in_be32(&ifc->cm_evter_stat);
165 if (cs_err) {
166 dev_err(ctrl->dev, "transaction sent to IFC is not mapped to"
167 "any memory bank 0x%08X\n", cs_err);
168 /* clear the chip select error */
169 out_be32(&ifc->cm_evter_stat, IFC_CM_EVTER_STAT_CSER);
170
171 /* read error attribute registers print the error information */
172 status = in_be32(&ifc->cm_erattr0);
173 err_addr = in_be32(&ifc->cm_erattr1);
174
175 if (status & IFC_CM_ERATTR0_ERTYP_READ)
176 dev_err(ctrl->dev, "Read transaction error"
177 "CM_ERATTR0 0x%08X\n", status);
178 else
179 dev_err(ctrl->dev, "Write transaction error"
180 "CM_ERATTR0 0x%08X\n", status);
181
182 err_axiid = (status & IFC_CM_ERATTR0_ERAID) >>
183 IFC_CM_ERATTR0_ERAID_SHIFT;
184 dev_err(ctrl->dev, "AXI ID of the error"
185 "transaction 0x%08X\n", err_axiid);
186
187 err_srcid = (status & IFC_CM_ERATTR0_ESRCID) >>
188 IFC_CM_ERATTR0_ESRCID_SHIFT;
189 dev_err(ctrl->dev, "SRC ID of the error"
190 "transaction 0x%08X\n", err_srcid);
191
192 dev_err(ctrl->dev, "Transaction Address corresponding to error"
193 "ERADDR 0x%08X\n", err_addr);
194
195 ret = IRQ_HANDLED;
196 }
197
198 if (check_nand_stat(ctrl))
199 ret = IRQ_HANDLED;
200
201 return ret;
202}
203
204/*
205 * fsl_ifc_ctrl_probe
206 *
207 * called by device layer when it finds a device matching
208 * one our driver can handled. This code allocates all of
209 * the resources needed for the controller only. The
210 * resources for the NAND banks themselves are allocated
211 * in the chip probe function.
212*/
Greg Kroah-Hartmancad5cef2012-12-21 14:04:10 -0800213static int fsl_ifc_ctrl_probe(struct platform_device *dev)
Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +0530214{
215 int ret = 0;
Aaron Sierra09691662014-08-26 18:18:33 -0500216 int version, banks;
Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +0530217
218 dev_info(&dev->dev, "Freescale Integrated Flash Controller\n");
219
220 fsl_ifc_ctrl_dev = kzalloc(sizeof(*fsl_ifc_ctrl_dev), GFP_KERNEL);
221 if (!fsl_ifc_ctrl_dev)
222 return -ENOMEM;
223
224 dev_set_drvdata(&dev->dev, fsl_ifc_ctrl_dev);
225
226 /* IOMAP the entire IFC region */
227 fsl_ifc_ctrl_dev->regs = of_iomap(dev->dev.of_node, 0);
228 if (!fsl_ifc_ctrl_dev->regs) {
229 dev_err(&dev->dev, "failed to get memory region\n");
230 ret = -ENODEV;
231 goto err;
232 }
233
Aaron Sierra09691662014-08-26 18:18:33 -0500234 version = ioread32be(&fsl_ifc_ctrl_dev->regs->ifc_rev) &
235 FSL_IFC_VERSION_MASK;
236 banks = (version == FSL_IFC_VERSION_1_0_0) ? 4 : 8;
237 dev_info(&dev->dev, "IFC version %d.%d, %d banks\n",
238 version >> 24, (version >> 16) & 0xf, banks);
239
240 fsl_ifc_ctrl_dev->version = version;
241 fsl_ifc_ctrl_dev->banks = banks;
242
Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +0530243 /* get the Controller level irq */
244 fsl_ifc_ctrl_dev->irq = irq_of_parse_and_map(dev->dev.of_node, 0);
245 if (fsl_ifc_ctrl_dev->irq == NO_IRQ) {
246 dev_err(&dev->dev, "failed to get irq resource "
247 "for IFC\n");
248 ret = -ENODEV;
249 goto err;
250 }
251
252 /* get the nand machine irq */
253 fsl_ifc_ctrl_dev->nand_irq =
254 irq_of_parse_and_map(dev->dev.of_node, 1);
Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +0530255
256 fsl_ifc_ctrl_dev->dev = &dev->dev;
257
258 ret = fsl_ifc_ctrl_init(fsl_ifc_ctrl_dev);
259 if (ret < 0)
260 goto err;
261
262 init_waitqueue_head(&fsl_ifc_ctrl_dev->nand_wait);
263
264 ret = request_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_irq, IRQF_SHARED,
265 "fsl-ifc", fsl_ifc_ctrl_dev);
266 if (ret != 0) {
267 dev_err(&dev->dev, "failed to install irq (%d)\n",
268 fsl_ifc_ctrl_dev->irq);
269 goto err_irq;
270 }
271
Prabhakar Kushwaha721c0702012-09-13 13:34:11 +0530272 if (fsl_ifc_ctrl_dev->nand_irq) {
273 ret = request_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_nand_irq,
274 0, "fsl-ifc-nand", fsl_ifc_ctrl_dev);
275 if (ret != 0) {
276 dev_err(&dev->dev, "failed to install irq (%d)\n",
277 fsl_ifc_ctrl_dev->nand_irq);
278 goto err_nandirq;
279 }
Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +0530280 }
281
282 return 0;
283
284err_nandirq:
285 free_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_ctrl_dev);
286 irq_dispose_mapping(fsl_ifc_ctrl_dev->nand_irq);
287err_irq:
288 free_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_dev);
289 irq_dispose_mapping(fsl_ifc_ctrl_dev->irq);
290err:
291 return ret;
292}
293
294static const struct of_device_id fsl_ifc_match[] = {
295 {
296 .compatible = "fsl,ifc",
297 },
298 {},
299};
300
301static struct platform_driver fsl_ifc_ctrl_driver = {
302 .driver = {
303 .name = "fsl-ifc",
304 .of_match_table = fsl_ifc_match,
305 },
306 .probe = fsl_ifc_ctrl_probe,
307 .remove = fsl_ifc_ctrl_remove,
308};
309
Prabhakar Kushwahad2ae2e22014-01-17 11:15:16 +0530310static int __init fsl_ifc_init(void)
311{
312 return platform_driver_register(&fsl_ifc_ctrl_driver);
313}
314subsys_initcall(fsl_ifc_init);
Prabhakar Kushwahaa20cbde2011-12-27 17:39:13 +0530315
316MODULE_LICENSE("GPL");
317MODULE_AUTHOR("Freescale Semiconductor");
318MODULE_DESCRIPTION("Freescale Integrated Flash Controller driver");