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Sylver Bruneau22ac9232008-06-26 10:47:45 +02001/*
Nicolas Pitre3b937a72009-06-01 13:56:02 -04002 * drivers/watchdog/orion_wdt.c
Sylver Bruneau22ac9232008-06-26 10:47:45 +02003 *
Nicolas Pitre3b937a72009-06-01 13:56:02 -04004 * Watchdog driver for Orion/Kirkwood processors
Sylver Bruneau22ac9232008-06-26 10:47:45 +02005 *
6 * Author: Sylver Bruneau <sylver.bruneau@googlemail.com>
7 *
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
11 */
12
Joe Perches27c766a2012-02-15 15:06:19 -080013#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
Sylver Bruneau22ac9232008-06-26 10:47:45 +020015#include <linux/module.h>
16#include <linux/moduleparam.h>
17#include <linux/types.h>
18#include <linux/kernel.h>
Thomas Reitmayr9e058d42009-02-24 14:59:22 -080019#include <linux/platform_device.h>
Sylver Bruneau22ac9232008-06-26 10:47:45 +020020#include <linux/watchdog.h>
Ezequiel Garciae97662e2014-02-10 20:00:24 -030021#include <linux/interrupt.h>
Sylver Bruneau22ac9232008-06-26 10:47:45 +020022#include <linux/io.h>
Andrew Lunn4f04be62012-03-04 16:57:31 +010023#include <linux/clk.h>
Axel Lin0dd6e482012-03-26 11:14:29 +080024#include <linux/err.h>
Andrew Lunn1e7bad02012-06-10 15:20:06 +020025#include <linux/of.h>
Ezequiel Garciafc723852014-02-10 20:00:28 -030026#include <linux/of_device.h>
Sylver Bruneau22ac9232008-06-26 10:47:45 +020027
Ezequiel Garcia868eb612014-02-10 20:00:25 -030028/* RSTOUT mask register physical address for Orion5x, Kirkwood and Dove */
29#define ORION_RSTOUT_MASK_OFFSET 0x20108
30
31/* Internal registers can be configured at any 1 MiB aligned address */
32#define INTERNAL_REGS_MASK ~(SZ_1M - 1)
Sylver Bruneau22ac9232008-06-26 10:47:45 +020033
34/*
35 * Watchdog timer block registers.
36 */
Jason Coopera855a7c2012-03-15 00:33:26 +000037#define TIMER_CTRL 0x0000
Ezequiel Garcia463f96e2014-02-10 20:00:31 -030038#define TIMER_A370_STATUS 0x04
Sylver Bruneau22ac9232008-06-26 10:47:45 +020039
Thomas Reitmayr9e058d42009-02-24 14:59:22 -080040#define WDT_MAX_CYCLE_COUNT 0xffffffff
Sylver Bruneau22ac9232008-06-26 10:47:45 +020041
Ezequiel Garcia463f96e2014-02-10 20:00:31 -030042#define WDT_A370_RATIO_MASK(v) ((v) << 16)
43#define WDT_A370_RATIO_SHIFT 5
44#define WDT_A370_RATIO (1 << WDT_A370_RATIO_SHIFT)
45
46#define WDT_AXP_FIXED_ENABLE_BIT BIT(10)
47#define WDT_A370_EXPIRED BIT(31)
Russell Kingfa142ff2013-06-18 17:19:32 +010048
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +010049static bool nowayout = WATCHDOG_NOWAYOUT;
Thomas Reitmayr9e058d42009-02-24 14:59:22 -080050static int heartbeat = -1; /* module parameter (seconds) */
Ezequiel Garciab89a9c42014-02-10 20:00:27 -030051
Ezequiel Garcia19242272014-02-10 20:00:29 -030052struct orion_watchdog;
53
Ezequiel Garciafc723852014-02-10 20:00:28 -030054struct orion_watchdog_data {
55 int wdt_counter_offset;
56 int wdt_enable_bit;
57 int rstout_enable_bit;
Ezequiel Garciab4836422014-03-15 15:18:01 -030058 int rstout_mask_bit;
Ezequiel Garcia19242272014-02-10 20:00:29 -030059 int (*clock_init)(struct platform_device *,
60 struct orion_watchdog *);
Ezequiel Garcia1b0ea572014-03-15 15:18:00 -030061 int (*enabled)(struct orion_watchdog *);
Ezequiel Garcia490d8e32014-02-10 20:00:30 -030062 int (*start)(struct watchdog_device *);
Ezequiel Garciaebf5cf72014-03-15 15:17:59 -030063 int (*stop)(struct watchdog_device *);
Ezequiel Garciafc723852014-02-10 20:00:28 -030064};
65
Ezequiel Garciab89a9c42014-02-10 20:00:27 -030066struct orion_watchdog {
67 struct watchdog_device wdt;
68 void __iomem *reg;
69 void __iomem *rstout;
Ezequiel Garciab4836422014-03-15 15:18:01 -030070 void __iomem *rstout_mask;
Ezequiel Garciab89a9c42014-02-10 20:00:27 -030071 unsigned long clk_rate;
72 struct clk *clk;
Ezequiel Garciafc723852014-02-10 20:00:28 -030073 const struct orion_watchdog_data *data;
Ezequiel Garciab89a9c42014-02-10 20:00:27 -030074};
Sylver Bruneau22ac9232008-06-26 10:47:45 +020075
Ezequiel Garcia19242272014-02-10 20:00:29 -030076static int orion_wdt_clock_init(struct platform_device *pdev,
77 struct orion_watchdog *dev)
78{
79 int ret;
80
Ezequiel Garcia463f96e2014-02-10 20:00:31 -030081 dev->clk = clk_get(&pdev->dev, NULL);
Ezequiel Garcia19242272014-02-10 20:00:29 -030082 if (IS_ERR(dev->clk))
83 return PTR_ERR(dev->clk);
84 ret = clk_prepare_enable(dev->clk);
Ezequiel Garcia463f96e2014-02-10 20:00:31 -030085 if (ret) {
86 clk_put(dev->clk);
Ezequiel Garcia19242272014-02-10 20:00:29 -030087 return ret;
Ezequiel Garcia463f96e2014-02-10 20:00:31 -030088 }
89
90 dev->clk_rate = clk_get_rate(dev->clk);
91 return 0;
92}
93
94static int armada370_wdt_clock_init(struct platform_device *pdev,
95 struct orion_watchdog *dev)
96{
97 int ret;
98
99 dev->clk = clk_get(&pdev->dev, NULL);
100 if (IS_ERR(dev->clk))
101 return PTR_ERR(dev->clk);
102 ret = clk_prepare_enable(dev->clk);
103 if (ret) {
104 clk_put(dev->clk);
105 return ret;
106 }
107
108 /* Setup watchdog input clock */
109 atomic_io_modify(dev->reg + TIMER_CTRL,
110 WDT_A370_RATIO_MASK(WDT_A370_RATIO_SHIFT),
111 WDT_A370_RATIO_MASK(WDT_A370_RATIO_SHIFT));
112
113 dev->clk_rate = clk_get_rate(dev->clk) / WDT_A370_RATIO;
114 return 0;
115}
116
Ezequiel Garcia8067042a2014-11-04 10:21:32 -0300117static int armada375_wdt_clock_init(struct platform_device *pdev,
118 struct orion_watchdog *dev)
119{
120 int ret;
121
122 dev->clk = of_clk_get_by_name(pdev->dev.of_node, "fixed");
123 if (!IS_ERR(dev->clk)) {
124 ret = clk_prepare_enable(dev->clk);
125 if (ret) {
126 clk_put(dev->clk);
127 return ret;
128 }
129
130 atomic_io_modify(dev->reg + TIMER_CTRL,
131 WDT_AXP_FIXED_ENABLE_BIT,
132 WDT_AXP_FIXED_ENABLE_BIT);
133 dev->clk_rate = clk_get_rate(dev->clk);
134
135 return 0;
136 }
137
138 /* Mandatory fallback for proper devicetree backward compatibility */
139 dev->clk = clk_get(&pdev->dev, NULL);
140 if (IS_ERR(dev->clk))
141 return PTR_ERR(dev->clk);
142
143 ret = clk_prepare_enable(dev->clk);
144 if (ret) {
145 clk_put(dev->clk);
146 return ret;
147 }
148
149 atomic_io_modify(dev->reg + TIMER_CTRL,
150 WDT_A370_RATIO_MASK(WDT_A370_RATIO_SHIFT),
151 WDT_A370_RATIO_MASK(WDT_A370_RATIO_SHIFT));
152 dev->clk_rate = clk_get_rate(dev->clk) / WDT_A370_RATIO;
153
154 return 0;
155}
156
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300157static int armadaxp_wdt_clock_init(struct platform_device *pdev,
158 struct orion_watchdog *dev)
159{
160 int ret;
161
162 dev->clk = of_clk_get_by_name(pdev->dev.of_node, "fixed");
163 if (IS_ERR(dev->clk))
164 return PTR_ERR(dev->clk);
165 ret = clk_prepare_enable(dev->clk);
166 if (ret) {
167 clk_put(dev->clk);
168 return ret;
169 }
170
171 /* Enable the fixed watchdog clock input */
172 atomic_io_modify(dev->reg + TIMER_CTRL,
173 WDT_AXP_FIXED_ENABLE_BIT,
174 WDT_AXP_FIXED_ENABLE_BIT);
Ezequiel Garcia19242272014-02-10 20:00:29 -0300175
176 dev->clk_rate = clk_get_rate(dev->clk);
177 return 0;
178}
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200179
Axel Lin0dd6e482012-03-26 11:14:29 +0800180static int orion_wdt_ping(struct watchdog_device *wdt_dev)
Thomas Reitmayrdf6707b2009-02-20 19:44:59 +0100181{
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300182 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
Thomas Reitmayrdf6707b2009-02-20 19:44:59 +0100183 /* Reload watchdog duration */
Ezequiel Garciafc723852014-02-10 20:00:28 -0300184 writel(dev->clk_rate * wdt_dev->timeout,
185 dev->reg + dev->data->wdt_counter_offset);
Axel Lin0dd6e482012-03-26 11:14:29 +0800186 return 0;
Thomas Reitmayrdf6707b2009-02-20 19:44:59 +0100187}
Thomas Reitmayrdf6707b2009-02-20 19:44:59 +0100188
Ezequiel Garciab4836422014-03-15 15:18:01 -0300189static int armada375_start(struct watchdog_device *wdt_dev)
190{
191 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
192 u32 reg;
193
194 /* Set watchdog duration */
195 writel(dev->clk_rate * wdt_dev->timeout,
196 dev->reg + dev->data->wdt_counter_offset);
197
198 /* Clear the watchdog expiration bit */
199 atomic_io_modify(dev->reg + TIMER_A370_STATUS, WDT_A370_EXPIRED, 0);
200
201 /* Enable watchdog timer */
202 atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit,
203 dev->data->wdt_enable_bit);
204
205 /* Enable reset on watchdog */
206 reg = readl(dev->rstout);
207 reg |= dev->data->rstout_enable_bit;
208 writel(reg, dev->rstout);
209
210 atomic_io_modify(dev->rstout_mask, dev->data->rstout_mask_bit, 0);
211 return 0;
212}
213
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300214static int armada370_start(struct watchdog_device *wdt_dev)
215{
216 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
Ezequiel Garciaeba985e2014-03-15 15:17:58 -0300217 u32 reg;
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300218
219 /* Set watchdog duration */
220 writel(dev->clk_rate * wdt_dev->timeout,
221 dev->reg + dev->data->wdt_counter_offset);
222
223 /* Clear the watchdog expiration bit */
224 atomic_io_modify(dev->reg + TIMER_A370_STATUS, WDT_A370_EXPIRED, 0);
225
226 /* Enable watchdog timer */
227 atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit,
228 dev->data->wdt_enable_bit);
229
Ezequiel Garciaeba985e2014-03-15 15:17:58 -0300230 /* Enable reset on watchdog */
231 reg = readl(dev->rstout);
232 reg |= dev->data->rstout_enable_bit;
233 writel(reg, dev->rstout);
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300234 return 0;
235}
236
Ezequiel Garcia490d8e32014-02-10 20:00:30 -0300237static int orion_start(struct watchdog_device *wdt_dev)
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200238{
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300239 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
240
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200241 /* Set watchdog duration */
Ezequiel Garciafc723852014-02-10 20:00:28 -0300242 writel(dev->clk_rate * wdt_dev->timeout,
243 dev->reg + dev->data->wdt_counter_offset);
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200244
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200245 /* Enable watchdog timer */
Ezequiel Garciafc723852014-02-10 20:00:28 -0300246 atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit,
247 dev->data->wdt_enable_bit);
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200248
249 /* Enable reset on watchdog */
Ezequiel Garciafc723852014-02-10 20:00:28 -0300250 atomic_io_modify(dev->rstout, dev->data->rstout_enable_bit,
251 dev->data->rstout_enable_bit);
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300252
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200253 return 0;
254}
255
256static int orion_wdt_start(struct watchdog_device *wdt_dev)
257{
Ezequiel Garcia490d8e32014-02-10 20:00:30 -0300258 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200259
Ezequiel Garcia490d8e32014-02-10 20:00:30 -0300260 /* There are some per-SoC quirks to handle */
261 return dev->data->start(wdt_dev);
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200262}
263
Ezequiel Garciaebf5cf72014-03-15 15:17:59 -0300264static int orion_stop(struct watchdog_device *wdt_dev)
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200265{
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300266 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
Wim Van Sebroeck6d0f0df2008-10-02 09:32:45 +0000267
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200268 /* Disable reset on watchdog */
Ezequiel Garciafc723852014-02-10 20:00:28 -0300269 atomic_io_modify(dev->rstout, dev->data->rstout_enable_bit, 0);
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200270
271 /* Disable watchdog timer */
Ezequiel Garciafc723852014-02-10 20:00:28 -0300272 atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0);
Wim Van Sebroeck6d0f0df2008-10-02 09:32:45 +0000273
Axel Lin0dd6e482012-03-26 11:14:29 +0800274 return 0;
Wim Van Sebroeck6d0f0df2008-10-02 09:32:45 +0000275}
276
Ezequiel Garciab4836422014-03-15 15:18:01 -0300277static int armada375_stop(struct watchdog_device *wdt_dev)
278{
279 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
280 u32 reg;
281
282 /* Disable reset on watchdog */
283 atomic_io_modify(dev->rstout_mask, dev->data->rstout_mask_bit,
284 dev->data->rstout_mask_bit);
285 reg = readl(dev->rstout);
286 reg &= ~dev->data->rstout_enable_bit;
287 writel(reg, dev->rstout);
288
289 /* Disable watchdog timer */
290 atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0);
291
292 return 0;
293}
294
Ezequiel Garciaebf5cf72014-03-15 15:17:59 -0300295static int armada370_stop(struct watchdog_device *wdt_dev)
296{
297 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
298 u32 reg;
299
300 /* Disable reset on watchdog */
301 reg = readl(dev->rstout);
302 reg &= ~dev->data->rstout_enable_bit;
303 writel(reg, dev->rstout);
304
305 /* Disable watchdog timer */
306 atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0);
307
308 return 0;
309}
310
311static int orion_wdt_stop(struct watchdog_device *wdt_dev)
312{
313 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
314
315 return dev->data->stop(wdt_dev);
316}
317
Ezequiel Garcia1b0ea572014-03-15 15:18:00 -0300318static int orion_enabled(struct orion_watchdog *dev)
Ezequiel Garciad9d0c532014-02-10 20:00:23 -0300319{
320 bool enabled, running;
321
Ezequiel Garciafc723852014-02-10 20:00:28 -0300322 enabled = readl(dev->rstout) & dev->data->rstout_enable_bit;
323 running = readl(dev->reg + TIMER_CTRL) & dev->data->wdt_enable_bit;
Ezequiel Garciad9d0c532014-02-10 20:00:23 -0300324
325 return enabled && running;
326}
327
Ezequiel Garciab4836422014-03-15 15:18:01 -0300328static int armada375_enabled(struct orion_watchdog *dev)
329{
330 bool masked, enabled, running;
331
332 masked = readl(dev->rstout_mask) & dev->data->rstout_mask_bit;
333 enabled = readl(dev->rstout) & dev->data->rstout_enable_bit;
334 running = readl(dev->reg + TIMER_CTRL) & dev->data->wdt_enable_bit;
335
336 return !masked && enabled && running;
337}
338
Ezequiel Garcia1b0ea572014-03-15 15:18:00 -0300339static int orion_wdt_enabled(struct watchdog_device *wdt_dev)
340{
341 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
342
343 return dev->data->enabled(dev);
344}
345
Axel Lin0dd6e482012-03-26 11:14:29 +0800346static unsigned int orion_wdt_get_timeleft(struct watchdog_device *wdt_dev)
Wim Van Sebroeck6d0f0df2008-10-02 09:32:45 +0000347{
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300348 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
Ezequiel Garciafc723852014-02-10 20:00:28 -0300349 return readl(dev->reg + dev->data->wdt_counter_offset) / dev->clk_rate;
Axel Lin0dd6e482012-03-26 11:14:29 +0800350}
351
352static int orion_wdt_set_timeout(struct watchdog_device *wdt_dev,
353 unsigned int timeout)
354{
355 wdt_dev->timeout = timeout;
Wim Van Sebroeck6d0f0df2008-10-02 09:32:45 +0000356 return 0;
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200357}
358
Axel Lin0dd6e482012-03-26 11:14:29 +0800359static const struct watchdog_info orion_wdt_info = {
360 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
361 .identity = "Orion Watchdog",
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200362};
363
Axel Lin0dd6e482012-03-26 11:14:29 +0800364static const struct watchdog_ops orion_wdt_ops = {
365 .owner = THIS_MODULE,
366 .start = orion_wdt_start,
367 .stop = orion_wdt_stop,
368 .ping = orion_wdt_ping,
369 .set_timeout = orion_wdt_set_timeout,
370 .get_timeleft = orion_wdt_get_timeleft,
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200371};
372
Ezequiel Garciae97662e2014-02-10 20:00:24 -0300373static irqreturn_t orion_wdt_irq(int irq, void *devid)
374{
375 panic("Watchdog Timeout");
376 return IRQ_HANDLED;
377}
378
Ezequiel Garcia868eb612014-02-10 20:00:25 -0300379/*
380 * The original devicetree binding for this driver specified only
381 * one memory resource, so in order to keep DT backwards compatibility
382 * we try to fallback to a hardcoded register address, if the resource
383 * is missing from the devicetree.
384 */
385static void __iomem *orion_wdt_ioremap_rstout(struct platform_device *pdev,
386 phys_addr_t internal_regs)
387{
388 struct resource *res;
389 phys_addr_t rstout;
390
391 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
392 if (res)
393 return devm_ioremap(&pdev->dev, res->start,
394 resource_size(res));
395
Ezequiel Garcia868eb612014-02-10 20:00:25 -0300396 rstout = internal_regs + ORION_RSTOUT_MASK_OFFSET;
397
Fabio Estevamedd9d3c2014-02-25 13:17:33 -0300398 WARN(1, FW_BUG "falling back to harcoded RSTOUT reg %pa\n", &rstout);
Ezequiel Garcia868eb612014-02-10 20:00:25 -0300399 return devm_ioremap(&pdev->dev, rstout, 0x4);
400}
401
Ezequiel Garciafc723852014-02-10 20:00:28 -0300402static const struct orion_watchdog_data orion_data = {
403 .rstout_enable_bit = BIT(1),
404 .wdt_enable_bit = BIT(4),
405 .wdt_counter_offset = 0x24,
Ezequiel Garcia19242272014-02-10 20:00:29 -0300406 .clock_init = orion_wdt_clock_init,
Ezequiel Garcia1b0ea572014-03-15 15:18:00 -0300407 .enabled = orion_enabled,
Ezequiel Garcia490d8e32014-02-10 20:00:30 -0300408 .start = orion_start,
Ezequiel Garciaebf5cf72014-03-15 15:17:59 -0300409 .stop = orion_stop,
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200410};
411
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300412static const struct orion_watchdog_data armada370_data = {
413 .rstout_enable_bit = BIT(8),
414 .wdt_enable_bit = BIT(8),
415 .wdt_counter_offset = 0x34,
416 .clock_init = armada370_wdt_clock_init,
Ezequiel Garcia1b0ea572014-03-15 15:18:00 -0300417 .enabled = orion_enabled,
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300418 .start = armada370_start,
Ezequiel Garciaebf5cf72014-03-15 15:17:59 -0300419 .stop = armada370_stop,
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300420};
421
422static const struct orion_watchdog_data armadaxp_data = {
423 .rstout_enable_bit = BIT(8),
424 .wdt_enable_bit = BIT(8),
425 .wdt_counter_offset = 0x34,
426 .clock_init = armadaxp_wdt_clock_init,
Ezequiel Garcia1b0ea572014-03-15 15:18:00 -0300427 .enabled = orion_enabled,
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300428 .start = armada370_start,
Ezequiel Garciaebf5cf72014-03-15 15:17:59 -0300429 .stop = armada370_stop,
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300430};
431
Ezequiel Garciab4836422014-03-15 15:18:01 -0300432static const struct orion_watchdog_data armada375_data = {
433 .rstout_enable_bit = BIT(8),
434 .rstout_mask_bit = BIT(10),
435 .wdt_enable_bit = BIT(8),
436 .wdt_counter_offset = 0x34,
Ezequiel Garcia8067042a2014-11-04 10:21:32 -0300437 .clock_init = armada375_wdt_clock_init,
Ezequiel Garciab4836422014-03-15 15:18:01 -0300438 .enabled = armada375_enabled,
439 .start = armada375_start,
440 .stop = armada375_stop,
441};
442
443static const struct orion_watchdog_data armada380_data = {
444 .rstout_enable_bit = BIT(8),
445 .rstout_mask_bit = BIT(10),
446 .wdt_enable_bit = BIT(8),
447 .wdt_counter_offset = 0x34,
448 .clock_init = armadaxp_wdt_clock_init,
449 .enabled = armada375_enabled,
450 .start = armada375_start,
451 .stop = armada375_stop,
452};
453
Ezequiel Garciafc723852014-02-10 20:00:28 -0300454static const struct of_device_id orion_wdt_of_match_table[] = {
455 {
456 .compatible = "marvell,orion-wdt",
457 .data = &orion_data,
458 },
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300459 {
460 .compatible = "marvell,armada-370-wdt",
461 .data = &armada370_data,
462 },
463 {
464 .compatible = "marvell,armada-xp-wdt",
465 .data = &armadaxp_data,
466 },
Ezequiel Garciab4836422014-03-15 15:18:01 -0300467 {
468 .compatible = "marvell,armada-375-wdt",
469 .data = &armada375_data,
470 },
471 {
472 .compatible = "marvell,armada-380-wdt",
473 .data = &armada380_data,
474 },
Ezequiel Garciafc723852014-02-10 20:00:28 -0300475 {},
476};
477MODULE_DEVICE_TABLE(of, orion_wdt_of_match_table);
478
Ezequiel Garciaaaaac9e2014-03-15 15:17:56 -0300479static int orion_wdt_get_regs(struct platform_device *pdev,
480 struct orion_watchdog *dev)
481{
Ezequiel Garcia92d4fc12014-03-15 15:17:57 -0300482 struct device_node *node = pdev->dev.of_node;
Ezequiel Garciaaaaac9e2014-03-15 15:17:56 -0300483 struct resource *res;
484
485 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
486 if (!res)
487 return -ENODEV;
488 dev->reg = devm_ioremap(&pdev->dev, res->start,
489 resource_size(res));
490 if (!dev->reg)
491 return -ENOMEM;
492
Ezequiel Garcia92d4fc12014-03-15 15:17:57 -0300493 /* Each supported compatible has some RSTOUT register quirk */
494 if (of_device_is_compatible(node, "marvell,orion-wdt")) {
495
496 dev->rstout = orion_wdt_ioremap_rstout(pdev, res->start &
497 INTERNAL_REGS_MASK);
498 if (!dev->rstout)
499 return -ENODEV;
500
501 } else if (of_device_is_compatible(node, "marvell,armada-370-wdt") ||
502 of_device_is_compatible(node, "marvell,armada-xp-wdt")) {
503
504 /* Dedicated RSTOUT register, can be requested. */
505 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
506 dev->rstout = devm_ioremap_resource(&pdev->dev, res);
507 if (IS_ERR(dev->rstout))
508 return PTR_ERR(dev->rstout);
509
Ezequiel Garciab4836422014-03-15 15:18:01 -0300510 } else if (of_device_is_compatible(node, "marvell,armada-375-wdt") ||
511 of_device_is_compatible(node, "marvell,armada-380-wdt")) {
512
513 /* Dedicated RSTOUT register, can be requested. */
514 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
515 dev->rstout = devm_ioremap_resource(&pdev->dev, res);
516 if (IS_ERR(dev->rstout))
517 return PTR_ERR(dev->rstout);
518
519 res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
520 if (!res)
521 return -ENODEV;
522 dev->rstout_mask = devm_ioremap(&pdev->dev, res->start,
523 resource_size(res));
524 if (!dev->rstout_mask)
525 return -ENOMEM;
526
Ezequiel Garcia92d4fc12014-03-15 15:17:57 -0300527 } else {
Ezequiel Garciaaaaac9e2014-03-15 15:17:56 -0300528 return -ENODEV;
Ezequiel Garcia92d4fc12014-03-15 15:17:57 -0300529 }
Ezequiel Garciaaaaac9e2014-03-15 15:17:56 -0300530
531 return 0;
532}
533
Bill Pemberton2d991a12012-11-19 13:21:41 -0500534static int orion_wdt_probe(struct platform_device *pdev)
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800535{
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300536 struct orion_watchdog *dev;
Ezequiel Garciafc723852014-02-10 20:00:28 -0300537 const struct of_device_id *match;
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300538 unsigned int wdt_max_duration; /* (seconds) */
Ezequiel Garciae97662e2014-02-10 20:00:24 -0300539 int ret, irq;
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800540
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300541 dev = devm_kzalloc(&pdev->dev, sizeof(struct orion_watchdog),
542 GFP_KERNEL);
543 if (!dev)
544 return -ENOMEM;
545
Ezequiel Garciafc723852014-02-10 20:00:28 -0300546 match = of_match_device(orion_wdt_of_match_table, &pdev->dev);
547 if (!match)
548 /* Default legacy match */
549 match = &orion_wdt_of_match_table[0];
550
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300551 dev->wdt.info = &orion_wdt_info;
552 dev->wdt.ops = &orion_wdt_ops;
553 dev->wdt.min_timeout = 1;
Ezequiel Garciafc723852014-02-10 20:00:28 -0300554 dev->data = match->data;
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800555
Ezequiel Garciaaaaac9e2014-03-15 15:17:56 -0300556 ret = orion_wdt_get_regs(pdev, dev);
557 if (ret)
558 return ret;
Axel Lin0dd6e482012-03-26 11:14:29 +0800559
Ezequiel Garcia19242272014-02-10 20:00:29 -0300560 ret = dev->data->clock_init(pdev, dev);
Axel Lin0dd6e482012-03-26 11:14:29 +0800561 if (ret) {
Ezequiel Garcia19242272014-02-10 20:00:29 -0300562 dev_err(&pdev->dev, "cannot initialize clock\n");
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800563 return ret;
Axel Lin0dd6e482012-03-26 11:14:29 +0800564 }
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800565
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300566 wdt_max_duration = WDT_MAX_CYCLE_COUNT / dev->clk_rate;
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800567
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300568 dev->wdt.timeout = wdt_max_duration;
569 dev->wdt.max_timeout = wdt_max_duration;
Pratyush Anand65518812015-08-20 14:05:01 +0530570 dev->wdt.parent = &pdev->dev;
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300571 watchdog_init_timeout(&dev->wdt, heartbeat, &pdev->dev);
572
573 platform_set_drvdata(pdev, &dev->wdt);
574 watchdog_set_drvdata(&dev->wdt, dev);
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800575
Ezequiel Garciad9d0c532014-02-10 20:00:23 -0300576 /*
577 * Let's make sure the watchdog is fully stopped, unless it's
578 * explicitly enabled. This may be the case if the module was
579 * removed and re-insterted, or if the bootloader explicitly
580 * set a running watchdog before booting the kernel.
581 */
Ezequiel Garcia1b0ea572014-03-15 15:18:00 -0300582 if (!orion_wdt_enabled(&dev->wdt))
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300583 orion_wdt_stop(&dev->wdt);
Ezequiel Garciad9d0c532014-02-10 20:00:23 -0300584
Ezequiel Garciae97662e2014-02-10 20:00:24 -0300585 /* Request the IRQ only after the watchdog is disabled */
586 irq = platform_get_irq(pdev, 0);
587 if (irq > 0) {
588 /*
589 * Not all supported platforms specify an interrupt for the
590 * watchdog, so let's make it optional.
591 */
592 ret = devm_request_irq(&pdev->dev, irq, orion_wdt_irq, 0,
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300593 pdev->name, dev);
Ezequiel Garciae97662e2014-02-10 20:00:24 -0300594 if (ret < 0) {
595 dev_err(&pdev->dev, "failed to request IRQ\n");
596 goto disable_clk;
597 }
598 }
599
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300600 watchdog_set_nowayout(&dev->wdt, nowayout);
601 ret = watchdog_register_device(&dev->wdt);
Ezequiel Garciabb02c662014-02-10 20:00:20 -0300602 if (ret)
603 goto disable_clk;
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800604
Joe Perches27c766a2012-02-15 15:06:19 -0800605 pr_info("Initial timeout %d sec%s\n",
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300606 dev->wdt.timeout, nowayout ? ", nowayout" : "");
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800607 return 0;
Ezequiel Garciabb02c662014-02-10 20:00:20 -0300608
609disable_clk:
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300610 clk_disable_unprepare(dev->clk);
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300611 clk_put(dev->clk);
Ezequiel Garciabb02c662014-02-10 20:00:20 -0300612 return ret;
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800613}
614
Bill Pemberton4b12b892012-11-19 13:26:24 -0500615static int orion_wdt_remove(struct platform_device *pdev)
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200616{
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300617 struct watchdog_device *wdt_dev = platform_get_drvdata(pdev);
618 struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
619
620 watchdog_unregister_device(wdt_dev);
621 clk_disable_unprepare(dev->clk);
Ezequiel Garcia463f96e2014-02-10 20:00:31 -0300622 clk_put(dev->clk);
Axel Lin0dd6e482012-03-26 11:14:29 +0800623 return 0;
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200624}
625
Nicolas Pitre3b937a72009-06-01 13:56:02 -0400626static void orion_wdt_shutdown(struct platform_device *pdev)
Thomas Reitmayrdf6707b2009-02-20 19:44:59 +0100627{
Ezequiel Garciab89a9c42014-02-10 20:00:27 -0300628 struct watchdog_device *wdt_dev = platform_get_drvdata(pdev);
629 orion_wdt_stop(wdt_dev);
Thomas Reitmayrdf6707b2009-02-20 19:44:59 +0100630}
631
Nicolas Pitre3b937a72009-06-01 13:56:02 -0400632static struct platform_driver orion_wdt_driver = {
633 .probe = orion_wdt_probe,
Bill Pemberton82268712012-11-19 13:21:12 -0500634 .remove = orion_wdt_remove,
Nicolas Pitre3b937a72009-06-01 13:56:02 -0400635 .shutdown = orion_wdt_shutdown,
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800636 .driver = {
Nicolas Pitre3b937a72009-06-01 13:56:02 -0400637 .name = "orion_wdt",
Sachin Kamat85eee812013-09-30 10:12:51 +0530638 .of_match_table = orion_wdt_of_match_table,
Thomas Reitmayr9e058d42009-02-24 14:59:22 -0800639 },
640};
641
Axel Linb8ec6112011-11-29 13:56:27 +0800642module_platform_driver(orion_wdt_driver);
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200643
644MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>");
Nicolas Pitre3b937a72009-06-01 13:56:02 -0400645MODULE_DESCRIPTION("Orion Processor Watchdog");
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200646
647module_param(heartbeat, int, 0);
Thomas Reitmayrdf6707b2009-02-20 19:44:59 +0100648MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds");
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200649
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +0100650module_param(nowayout, bool, 0);
Thomas Reitmayrdf6707b2009-02-20 19:44:59 +0100651MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
652 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
Sylver Bruneau22ac9232008-06-26 10:47:45 +0200653
654MODULE_LICENSE("GPL");
Lubomir Rintelf3ea7332013-01-04 15:06:28 +0100655MODULE_ALIAS("platform:orion_wdt");