Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 1 | /* |
Saravana Kannan | 217b9b1 | 2014-08-07 20:04:45 -0700 | [diff] [blame] | 2 | * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved. |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #define pr_fmt(fmt) "bimc-bwmon: " fmt |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/io.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/err.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/of.h> |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 26 | #include <linux/of_device.h> |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 27 | #include <linux/spinlock.h> |
| 28 | #include "governor_bw_hwmon.h" |
| 29 | |
| 30 | #define GLB_INT_STATUS(m) ((m)->global_base + 0x100) |
| 31 | #define GLB_INT_CLR(m) ((m)->global_base + 0x108) |
| 32 | #define GLB_INT_EN(m) ((m)->global_base + 0x10C) |
| 33 | #define MON_INT_STATUS(m) ((m)->base + 0x100) |
| 34 | #define MON_INT_CLR(m) ((m)->base + 0x108) |
| 35 | #define MON_INT_EN(m) ((m)->base + 0x10C) |
| 36 | #define MON_EN(m) ((m)->base + 0x280) |
| 37 | #define MON_CLEAR(m) ((m)->base + 0x284) |
| 38 | #define MON_CNT(m) ((m)->base + 0x288) |
| 39 | #define MON_THRES(m) ((m)->base + 0x290) |
| 40 | #define MON_MASK(m) ((m)->base + 0x298) |
| 41 | #define MON_MATCH(m) ((m)->base + 0x29C) |
| 42 | |
Hanumath Prasad | 1240169 | 2015-05-14 20:22:11 +0530 | [diff] [blame^] | 43 | /* |
| 44 | * Don't set the threshold lower than this value. This helps avoid |
| 45 | * threshold IRQs when the traffic is close to zero and even small |
| 46 | * changes can exceed the threshold percentage. |
| 47 | */ |
| 48 | #define FLOOR_MBPS 100UL |
| 49 | |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 50 | struct bwmon_spec { |
| 51 | bool wrap_on_thres; |
| 52 | bool overflow; |
| 53 | }; |
| 54 | |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 55 | struct bwmon { |
| 56 | void __iomem *base; |
| 57 | void __iomem *global_base; |
| 58 | unsigned int mport; |
| 59 | unsigned int irq; |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 60 | const struct bwmon_spec *spec; |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 61 | struct device *dev; |
| 62 | struct bw_hwmon hw; |
| 63 | }; |
| 64 | |
| 65 | #define to_bwmon(ptr) container_of(ptr, struct bwmon, hw) |
| 66 | |
| 67 | static DEFINE_SPINLOCK(glb_lock); |
| 68 | static void mon_enable(struct bwmon *m) |
| 69 | { |
| 70 | writel_relaxed(0x1, MON_EN(m)); |
| 71 | } |
| 72 | |
| 73 | static void mon_disable(struct bwmon *m) |
| 74 | { |
| 75 | writel_relaxed(0x0, MON_EN(m)); |
| 76 | } |
| 77 | |
| 78 | static void mon_clear(struct bwmon *m) |
| 79 | { |
| 80 | writel_relaxed(0x1, MON_CLEAR(m)); |
| 81 | /* |
| 82 | * The counter clear and IRQ clear bits are not in the same 4KB |
| 83 | * region. So, we need to make sure the counter clear is completed |
| 84 | * before we try to clear the IRQ or do any other counter operations. |
| 85 | */ |
| 86 | mb(); |
| 87 | } |
| 88 | |
| 89 | static void mon_irq_enable(struct bwmon *m) |
| 90 | { |
| 91 | u32 val; |
| 92 | |
| 93 | spin_lock(&glb_lock); |
| 94 | val = readl_relaxed(GLB_INT_EN(m)); |
| 95 | val |= 1 << m->mport; |
| 96 | writel_relaxed(val, GLB_INT_EN(m)); |
| 97 | spin_unlock(&glb_lock); |
| 98 | |
| 99 | val = readl_relaxed(MON_INT_EN(m)); |
| 100 | val |= 0x1; |
| 101 | writel_relaxed(val, MON_INT_EN(m)); |
| 102 | } |
| 103 | |
| 104 | static void mon_irq_disable(struct bwmon *m) |
| 105 | { |
| 106 | u32 val; |
| 107 | |
| 108 | spin_lock(&glb_lock); |
| 109 | val = readl_relaxed(GLB_INT_EN(m)); |
| 110 | val &= ~(1 << m->mport); |
| 111 | writel_relaxed(val, GLB_INT_EN(m)); |
| 112 | spin_unlock(&glb_lock); |
| 113 | |
| 114 | val = readl_relaxed(MON_INT_EN(m)); |
| 115 | val &= ~0x1; |
| 116 | writel_relaxed(val, MON_INT_EN(m)); |
| 117 | } |
| 118 | |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 119 | static unsigned int mon_irq_status(struct bwmon *m) |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 120 | { |
| 121 | u32 mval; |
| 122 | |
| 123 | mval = readl_relaxed(MON_INT_STATUS(m)); |
| 124 | |
| 125 | dev_dbg(m->dev, "IRQ status p:%x, g:%x\n", mval, |
| 126 | readl_relaxed(GLB_INT_STATUS(m))); |
| 127 | |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 128 | return mval; |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 129 | } |
| 130 | |
| 131 | static void mon_irq_clear(struct bwmon *m) |
| 132 | { |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 133 | writel_relaxed(0x3, MON_INT_CLR(m)); |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 134 | mb(); |
| 135 | writel_relaxed(1 << m->mport, GLB_INT_CLR(m)); |
| 136 | mb(); |
| 137 | } |
| 138 | |
| 139 | static void mon_set_limit(struct bwmon *m, u32 count) |
| 140 | { |
| 141 | writel_relaxed(count, MON_THRES(m)); |
| 142 | dev_dbg(m->dev, "Thres: %08x\n", count); |
| 143 | } |
| 144 | |
| 145 | static u32 mon_get_limit(struct bwmon *m) |
| 146 | { |
| 147 | return readl_relaxed(MON_THRES(m)); |
| 148 | } |
| 149 | |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 150 | #define THRES_HIT(status) (status & BIT(0)) |
| 151 | #define OVERFLOW(status) (status & BIT(1)) |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 152 | static unsigned long mon_get_count(struct bwmon *m) |
| 153 | { |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 154 | unsigned long count, status; |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 155 | |
| 156 | count = readl_relaxed(MON_CNT(m)); |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 157 | status = mon_irq_status(m); |
| 158 | |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 159 | dev_dbg(m->dev, "Counter: %08lx\n", count); |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 160 | |
| 161 | if (OVERFLOW(status) && m->spec->overflow) |
| 162 | count += 0xFFFFFFFF; |
| 163 | if (THRES_HIT(status) && m->spec->wrap_on_thres) |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 164 | count += mon_get_limit(m); |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 165 | |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 166 | dev_dbg(m->dev, "Actual Count: %08lx\n", count); |
| 167 | |
| 168 | return count; |
| 169 | } |
| 170 | |
| 171 | /* ********** CPUBW specific code ********** */ |
| 172 | |
| 173 | /* Returns MBps of read/writes for the sampling window. */ |
| 174 | static unsigned int bytes_to_mbps(long long bytes, unsigned int us) |
| 175 | { |
| 176 | bytes *= USEC_PER_SEC; |
| 177 | do_div(bytes, us); |
| 178 | bytes = DIV_ROUND_UP_ULL(bytes, SZ_1M); |
| 179 | return bytes; |
| 180 | } |
| 181 | |
| 182 | static unsigned int mbps_to_bytes(unsigned long mbps, unsigned int ms, |
| 183 | unsigned int tolerance_percent) |
| 184 | { |
| 185 | mbps *= (100 + tolerance_percent) * ms; |
| 186 | mbps /= 100; |
| 187 | mbps = DIV_ROUND_UP(mbps, MSEC_PER_SEC); |
| 188 | mbps *= SZ_1M; |
| 189 | return mbps; |
| 190 | } |
| 191 | |
| 192 | static unsigned long meas_bw_and_set_irq(struct bw_hwmon *hw, |
| 193 | unsigned int tol, unsigned int us) |
| 194 | { |
| 195 | unsigned long mbps; |
| 196 | u32 limit; |
| 197 | unsigned int sample_ms = hw->df->profile->polling_ms; |
| 198 | struct bwmon *m = to_bwmon(hw); |
| 199 | |
| 200 | mon_disable(m); |
| 201 | |
| 202 | mbps = mon_get_count(m); |
| 203 | mbps = bytes_to_mbps(mbps, us); |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 204 | |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 205 | /* |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 206 | * If the counter wraps on thres, don't set the thres too low. |
| 207 | * Setting it too low runs the risk of the counter wrapping around |
| 208 | * multiple times before the IRQ is processed. |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 209 | */ |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 210 | if (likely(!m->spec->wrap_on_thres)) |
Hanumath Prasad | 1240169 | 2015-05-14 20:22:11 +0530 | [diff] [blame^] | 211 | limit = mbps_to_bytes(max(mbps, FLOOR_MBPS), sample_ms, tol); |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 212 | else |
| 213 | limit = mbps_to_bytes(max(mbps, 400UL), sample_ms, tol); |
| 214 | |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 215 | mon_set_limit(m, limit); |
| 216 | |
| 217 | mon_clear(m); |
| 218 | mon_irq_clear(m); |
| 219 | mon_enable(m); |
| 220 | |
| 221 | dev_dbg(m->dev, "MBps = %lu\n", mbps); |
| 222 | return mbps; |
| 223 | } |
| 224 | |
| 225 | static irqreturn_t bwmon_intr_handler(int irq, void *dev) |
| 226 | { |
| 227 | struct bwmon *m = dev; |
| 228 | if (mon_irq_status(m)) { |
| 229 | update_bw_hwmon(&m->hw); |
| 230 | return IRQ_HANDLED; |
| 231 | } |
| 232 | |
| 233 | return IRQ_NONE; |
| 234 | } |
| 235 | |
| 236 | static int start_bw_hwmon(struct bw_hwmon *hw, unsigned long mbps) |
| 237 | { |
| 238 | struct bwmon *m = to_bwmon(hw); |
| 239 | u32 limit; |
| 240 | int ret; |
| 241 | |
| 242 | ret = request_threaded_irq(m->irq, NULL, bwmon_intr_handler, |
| 243 | IRQF_ONESHOT | IRQF_SHARED, |
| 244 | dev_name(m->dev), m); |
| 245 | if (ret) { |
Saravana Kannan | cddae1b | 2014-08-07 19:38:02 -0700 | [diff] [blame] | 246 | dev_err(m->dev, "Unable to register interrupt handler! (%d)\n", |
| 247 | ret); |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 248 | return ret; |
| 249 | } |
| 250 | |
| 251 | mon_disable(m); |
| 252 | |
| 253 | limit = mbps_to_bytes(mbps, hw->df->profile->polling_ms, 0); |
| 254 | mon_set_limit(m, limit); |
| 255 | |
| 256 | mon_clear(m); |
| 257 | mon_irq_clear(m); |
| 258 | mon_irq_enable(m); |
| 259 | mon_enable(m); |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | |
| 264 | static void stop_bw_hwmon(struct bw_hwmon *hw) |
| 265 | { |
| 266 | struct bwmon *m = to_bwmon(hw); |
| 267 | |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 268 | free_irq(m->irq, m); |
| 269 | mon_disable(m); |
| 270 | mon_irq_disable(m); |
| 271 | mon_clear(m); |
| 272 | mon_irq_clear(m); |
| 273 | } |
| 274 | |
Saravana Kannan | cddae1b | 2014-08-07 19:38:02 -0700 | [diff] [blame] | 275 | static int suspend_bw_hwmon(struct bw_hwmon *hw) |
| 276 | { |
| 277 | struct bwmon *m = to_bwmon(hw); |
| 278 | |
Saravana Kannan | 217b9b1 | 2014-08-07 20:04:45 -0700 | [diff] [blame] | 279 | free_irq(m->irq, m); |
Saravana Kannan | cddae1b | 2014-08-07 19:38:02 -0700 | [diff] [blame] | 280 | mon_disable(m); |
| 281 | mon_irq_disable(m); |
| 282 | mon_irq_clear(m); |
| 283 | |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static int resume_bw_hwmon(struct bw_hwmon *hw) |
| 288 | { |
| 289 | struct bwmon *m = to_bwmon(hw); |
Saravana Kannan | 217b9b1 | 2014-08-07 20:04:45 -0700 | [diff] [blame] | 290 | int ret; |
Saravana Kannan | cddae1b | 2014-08-07 19:38:02 -0700 | [diff] [blame] | 291 | |
| 292 | mon_clear(m); |
| 293 | mon_irq_enable(m); |
| 294 | mon_enable(m); |
Saravana Kannan | 217b9b1 | 2014-08-07 20:04:45 -0700 | [diff] [blame] | 295 | ret = request_threaded_irq(m->irq, NULL, bwmon_intr_handler, |
| 296 | IRQF_ONESHOT | IRQF_SHARED, |
| 297 | dev_name(m->dev), m); |
| 298 | if (ret) { |
| 299 | dev_err(m->dev, "Unable to register interrupt handler! (%d)\n", |
| 300 | ret); |
| 301 | return ret; |
| 302 | } |
Saravana Kannan | cddae1b | 2014-08-07 19:38:02 -0700 | [diff] [blame] | 303 | |
| 304 | return 0; |
| 305 | } |
| 306 | |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 307 | /*************************************************************************/ |
| 308 | |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 309 | static const struct bwmon_spec spec[] = { |
| 310 | { .wrap_on_thres = true, .overflow = false }, |
| 311 | { .wrap_on_thres = false, .overflow = true }, |
| 312 | }; |
| 313 | |
| 314 | static const struct of_device_id bimc_bwmon_match_table[] = { |
| 315 | { .compatible = "qcom,bimc-bwmon", .data = &spec[0] }, |
| 316 | { .compatible = "qcom,bimc-bwmon2", .data = &spec[1] }, |
| 317 | {} |
| 318 | }; |
| 319 | |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 320 | static int bimc_bwmon_driver_probe(struct platform_device *pdev) |
| 321 | { |
| 322 | struct device *dev = &pdev->dev; |
| 323 | struct resource *res; |
| 324 | struct bwmon *m; |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 325 | const struct of_device_id *id; |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 326 | int ret; |
| 327 | u32 data; |
| 328 | |
| 329 | m = devm_kzalloc(dev, sizeof(*m), GFP_KERNEL); |
| 330 | if (!m) |
| 331 | return -ENOMEM; |
| 332 | m->dev = dev; |
| 333 | |
| 334 | ret = of_property_read_u32(dev->of_node, "qcom,mport", &data); |
| 335 | if (ret) { |
| 336 | dev_err(dev, "mport not found!\n"); |
| 337 | return ret; |
| 338 | } |
| 339 | m->mport = data; |
| 340 | |
Saravana Kannan | 75206c2 | 2014-09-22 17:42:57 -0700 | [diff] [blame] | 341 | id = of_match_device(bimc_bwmon_match_table, dev); |
| 342 | if (!id) { |
| 343 | dev_err(dev, "Unknown device type!\n"); |
| 344 | return -ENODEV; |
| 345 | } |
| 346 | m->spec = id->data; |
| 347 | |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 348 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base"); |
| 349 | if (!res) { |
| 350 | dev_err(dev, "base not found!\n"); |
| 351 | return -EINVAL; |
| 352 | } |
| 353 | m->base = devm_ioremap(dev, res->start, resource_size(res)); |
| 354 | if (!m->base) { |
| 355 | dev_err(dev, "Unable map base!\n"); |
| 356 | return -ENOMEM; |
| 357 | } |
| 358 | |
| 359 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "global_base"); |
| 360 | if (!res) { |
| 361 | dev_err(dev, "global_base not found!\n"); |
| 362 | return -EINVAL; |
| 363 | } |
| 364 | m->global_base = devm_ioremap(dev, res->start, resource_size(res)); |
| 365 | if (!m->global_base) { |
| 366 | dev_err(dev, "Unable map global_base!\n"); |
| 367 | return -ENOMEM; |
| 368 | } |
| 369 | |
| 370 | m->irq = platform_get_irq(pdev, 0); |
| 371 | if (m->irq < 0) { |
| 372 | dev_err(dev, "Unable to get IRQ number\n"); |
| 373 | return m->irq; |
| 374 | } |
| 375 | |
| 376 | m->hw.of_node = of_parse_phandle(dev->of_node, "qcom,target-dev", 0); |
| 377 | if (!m->hw.of_node) |
| 378 | return -EINVAL; |
| 379 | m->hw.start_hwmon = &start_bw_hwmon; |
| 380 | m->hw.stop_hwmon = &stop_bw_hwmon; |
Saravana Kannan | cddae1b | 2014-08-07 19:38:02 -0700 | [diff] [blame] | 381 | m->hw.suspend_hwmon = &suspend_bw_hwmon; |
| 382 | m->hw.resume_hwmon = &resume_bw_hwmon; |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 383 | m->hw.meas_bw_and_set_irq = &meas_bw_and_set_irq; |
| 384 | |
| 385 | ret = register_bw_hwmon(dev, &m->hw); |
| 386 | if (ret) { |
| 387 | dev_err(dev, "Dev BW hwmon registration failed\n"); |
| 388 | return ret; |
| 389 | } |
| 390 | |
| 391 | return 0; |
| 392 | } |
| 393 | |
Saravana Kannan | ed84c52 | 2014-05-28 18:59:54 -0700 | [diff] [blame] | 394 | static struct platform_driver bimc_bwmon_driver = { |
| 395 | .probe = bimc_bwmon_driver_probe, |
| 396 | .driver = { |
| 397 | .name = "bimc-bwmon", |
| 398 | .of_match_table = bimc_bwmon_match_table, |
| 399 | }, |
| 400 | }; |
| 401 | |
| 402 | module_platform_driver(bimc_bwmon_driver); |
| 403 | MODULE_DESCRIPTION("BIMC bandwidth monitor driver"); |
| 404 | MODULE_LICENSE("GPL v2"); |