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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III4 * flexcop-pci.c - covers the PCI part including DMA transfers5 * see flexcop.c for copyright information6 */7 8#define FC_LOG_PREFIX "flexcop-pci"9#include "flexcop-common.h"10 11static int enable_pid_filtering = 1;12module_param(enable_pid_filtering, int, 0444);13MODULE_PARM_DESC(enable_pid_filtering,14 "enable hardware pid filtering: supported values: 0 (fullts), 1");15 16static int irq_chk_intv = 100;17module_param(irq_chk_intv, int, 0644);18MODULE_PARM_DESC(irq_chk_intv, "set the interval for IRQ streaming watchdog.");19 20#ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG21#define dprintk(level, args...) \22 do { if ((debug & (level))) printk(args); } while (0)23#define DEBSTATUS ""24#else25#define dprintk(level, args...) no_printk(args)26#define DEBSTATUS " (debugging is not enabled)"27#endif28 29#define deb_info(args...) dprintk(0x01, args)30#define deb_reg(args...) dprintk(0x02, args)31#define deb_ts(args...) dprintk(0x04, args)32#define deb_irq(args...) dprintk(0x08, args)33#define deb_chk(args...) dprintk(0x10, args)34 35static int debug;36module_param(debug, int, 0644);37MODULE_PARM_DESC(debug,38 "set debug level (1=info,2=regs,4=TS,8=irqdma,16=check (|-able))."39 DEBSTATUS);40 41#define DRIVER_VERSION "0.1"42#define DRIVER_NAME "flexcop-pci"43#define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@posteo.de>"44 45struct flexcop_pci {46 struct pci_dev *pdev;47 48#define FC_PCI_INIT 0x0149#define FC_PCI_DMA_INIT 0x0250 int init_state;51 52 void __iomem *io_mem;53 u32 irq;54 /* buffersize (at least for DMA1, need to be % 188 == 0,55 * this logic is required */56#define FC_DEFAULT_DMA1_BUFSIZE (1280 * 188)57#define FC_DEFAULT_DMA2_BUFSIZE (10 * 188)58 struct flexcop_dma dma[2];59 60 int active_dma1_addr; /* 0 = addr0 of dma1; 1 = addr1 of dma1 */61 u32 last_dma1_cur_pos;62 /* position of the pointer last time the timer/packet irq occurred */63 int count;64 int count_prev;65 int stream_problem;66 67 spinlock_t irq_lock;68 unsigned long last_irq;69 70 struct delayed_work irq_check_work;71 struct flexcop_device *fc_dev;72};73 74static int lastwreg, lastwval, lastrreg, lastrval;75 76static flexcop_ibi_value flexcop_pci_read_ibi_reg(struct flexcop_device *fc,77 flexcop_ibi_register r)78{79 struct flexcop_pci *fc_pci = fc->bus_specific;80 flexcop_ibi_value v;81 v.raw = readl(fc_pci->io_mem + r);82 83 if (lastrreg != r || lastrval != v.raw) {84 lastrreg = r; lastrval = v.raw;85 deb_reg("new rd: %3x: %08x\n", r, v.raw);86 }87 88 return v;89}90 91static int flexcop_pci_write_ibi_reg(struct flexcop_device *fc,92 flexcop_ibi_register r, flexcop_ibi_value v)93{94 struct flexcop_pci *fc_pci = fc->bus_specific;95 96 if (lastwreg != r || lastwval != v.raw) {97 lastwreg = r; lastwval = v.raw;98 deb_reg("new wr: %3x: %08x\n", r, v.raw);99 }100 101 writel(v.raw, fc_pci->io_mem + r);102 return 0;103}104 105static void flexcop_pci_irq_check_work(struct work_struct *work)106{107 struct flexcop_pci *fc_pci =108 container_of(work, struct flexcop_pci, irq_check_work.work);109 struct flexcop_device *fc = fc_pci->fc_dev;110 111 if (fc->feedcount) {112 113 if (fc_pci->count == fc_pci->count_prev) {114 deb_chk("no IRQ since the last check\n");115 if (fc_pci->stream_problem++ == 3) {116 struct dvb_demux_feed *feed;117 deb_info("flexcop-pci: stream problem, resetting pid filter\n");118 119 spin_lock_irq(&fc->demux.lock);120 list_for_each_entry(feed, &fc->demux.feed_list,121 list_head) {122 flexcop_pid_feed_control(fc, feed, 0);123 }124 125 list_for_each_entry(feed, &fc->demux.feed_list,126 list_head) {127 flexcop_pid_feed_control(fc, feed, 1);128 }129 spin_unlock_irq(&fc->demux.lock);130 131 fc_pci->stream_problem = 0;132 }133 } else {134 fc_pci->stream_problem = 0;135 fc_pci->count_prev = fc_pci->count;136 }137 }138 139 schedule_delayed_work(&fc_pci->irq_check_work,140 msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));141}142 143/* When PID filtering is turned on, we use the timer IRQ, because small amounts144 * of data need to be passed to the user space instantly as well. When PID145 * filtering is turned off, we use the page-change-IRQ */146static irqreturn_t flexcop_pci_isr(int irq, void *dev_id)147{148 struct flexcop_pci *fc_pci = dev_id;149 struct flexcop_device *fc = fc_pci->fc_dev;150 unsigned long flags;151 flexcop_ibi_value v;152 irqreturn_t ret = IRQ_HANDLED;153 154 spin_lock_irqsave(&fc_pci->irq_lock, flags);155 v = fc->read_ibi_reg(fc, irq_20c);156 157 /* errors */158 if (v.irq_20c.Data_receiver_error)159 deb_chk("data receiver error\n");160 if (v.irq_20c.Continuity_error_flag)161 deb_chk("Continuity error flag is set\n");162 if (v.irq_20c.LLC_SNAP_FLAG_set)163 deb_chk("LLC_SNAP_FLAG_set is set\n");164 if (v.irq_20c.Transport_Error)165 deb_chk("Transport error\n");166 167 if ((fc_pci->count % 1000) == 0)168 deb_chk("%d valid irq took place so far\n", fc_pci->count);169 170 if (v.irq_20c.DMA1_IRQ_Status == 1) {171 if (fc_pci->active_dma1_addr == 0)172 flexcop_pass_dmx_packets(fc_pci->fc_dev,173 fc_pci->dma[0].cpu_addr0,174 fc_pci->dma[0].size / 188);175 else176 flexcop_pass_dmx_packets(fc_pci->fc_dev,177 fc_pci->dma[0].cpu_addr1,178 fc_pci->dma[0].size / 188);179 180 deb_irq("page change to page: %d\n",!fc_pci->active_dma1_addr);181 fc_pci->active_dma1_addr = !fc_pci->active_dma1_addr;182 /* for the timer IRQ we only can use buffer dmx feeding, because we don't have183 * complete TS packets when reading from the DMA memory */184 } else if (v.irq_20c.DMA1_Timer_Status == 1) {185 dma_addr_t cur_addr =186 fc->read_ibi_reg(fc,dma1_008).dma_0x8.dma_cur_addr << 2;187 u32 cur_pos = cur_addr - fc_pci->dma[0].dma_addr0;188 if (cur_pos > fc_pci->dma[0].size * 2)189 goto error;190 191 deb_irq("%u irq: %08x cur_addr: %llx: cur_pos: %08x, last_cur_pos: %08x ",192 jiffies_to_usecs(jiffies - fc_pci->last_irq),193 v.raw, (unsigned long long)cur_addr, cur_pos,194 fc_pci->last_dma1_cur_pos);195 fc_pci->last_irq = jiffies;196 197 /* buffer end was reached, restarted from the beginning198 * pass the data from last_cur_pos to the buffer end to the demux199 */200 if (cur_pos < fc_pci->last_dma1_cur_pos) {201 deb_irq(" end was reached: passing %d bytes ",202 (fc_pci->dma[0].size*2 - 1) -203 fc_pci->last_dma1_cur_pos);204 flexcop_pass_dmx_data(fc_pci->fc_dev,205 fc_pci->dma[0].cpu_addr0 +206 fc_pci->last_dma1_cur_pos,207 (fc_pci->dma[0].size*2) -208 fc_pci->last_dma1_cur_pos);209 fc_pci->last_dma1_cur_pos = 0;210 }211 212 if (cur_pos > fc_pci->last_dma1_cur_pos) {213 deb_irq(" passing %d bytes ",214 cur_pos - fc_pci->last_dma1_cur_pos);215 flexcop_pass_dmx_data(fc_pci->fc_dev,216 fc_pci->dma[0].cpu_addr0 +217 fc_pci->last_dma1_cur_pos,218 cur_pos - fc_pci->last_dma1_cur_pos);219 }220 deb_irq("\n");221 222 fc_pci->last_dma1_cur_pos = cur_pos;223 fc_pci->count++;224 } else {225 deb_irq("isr for flexcop called, apparently without reason (%08x)\n",226 v.raw);227 ret = IRQ_NONE;228 }229 230error:231 spin_unlock_irqrestore(&fc_pci->irq_lock, flags);232 return ret;233}234 235static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff)236{237 struct flexcop_pci *fc_pci = fc->bus_specific;238 if (onoff) {239 flexcop_dma_config(fc, &fc_pci->dma[0], FC_DMA_1);240 flexcop_dma_config(fc, &fc_pci->dma[1], FC_DMA_2);241 flexcop_dma_config_timer(fc, FC_DMA_1, 0);242 flexcop_dma_xfer_control(fc, FC_DMA_1,243 FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1, 1);244 deb_irq("DMA xfer enabled\n");245 246 fc_pci->last_dma1_cur_pos = 0;247 flexcop_dma_control_timer_irq(fc, FC_DMA_1, 1);248 deb_irq("IRQ enabled\n");249 fc_pci->count_prev = fc_pci->count;250 } else {251 flexcop_dma_control_timer_irq(fc, FC_DMA_1, 0);252 deb_irq("IRQ disabled\n");253 254 flexcop_dma_xfer_control(fc, FC_DMA_1,255 FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1, 0);256 deb_irq("DMA xfer disabled\n");257 }258 return 0;259}260 261static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci)262{263 int ret;264 ret = flexcop_dma_allocate(fc_pci->pdev, &fc_pci->dma[0],265 FC_DEFAULT_DMA1_BUFSIZE);266 if (ret != 0)267 return ret;268 269 ret = flexcop_dma_allocate(fc_pci->pdev, &fc_pci->dma[1],270 FC_DEFAULT_DMA2_BUFSIZE);271 if (ret != 0) {272 flexcop_dma_free(&fc_pci->dma[0]);273 return ret;274 }275 276 flexcop_sram_set_dest(fc_pci->fc_dev, FC_SRAM_DEST_MEDIA |277 FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1);278 flexcop_sram_set_dest(fc_pci->fc_dev, FC_SRAM_DEST_CAO |279 FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2);280 fc_pci->init_state |= FC_PCI_DMA_INIT;281 return ret;282}283 284static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci)285{286 if (fc_pci->init_state & FC_PCI_DMA_INIT) {287 flexcop_dma_free(&fc_pci->dma[0]);288 flexcop_dma_free(&fc_pci->dma[1]);289 }290 fc_pci->init_state &= ~FC_PCI_DMA_INIT;291}292 293static int flexcop_pci_init(struct flexcop_pci *fc_pci)294{295 int ret;296 297 info("card revision %x", fc_pci->pdev->revision);298 299 if ((ret = pci_enable_device(fc_pci->pdev)) != 0)300 return ret;301 pci_set_master(fc_pci->pdev);302 303 if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0)304 goto err_pci_disable_device;305 306 fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800);307 308 if (!fc_pci->io_mem) {309 err("cannot map io memory\n");310 ret = -EIO;311 goto err_pci_release_regions;312 }313 314 pci_set_drvdata(fc_pci->pdev, fc_pci);315 spin_lock_init(&fc_pci->irq_lock);316 if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr,317 IRQF_SHARED, DRIVER_NAME, fc_pci)) != 0)318 goto err_pci_iounmap;319 320 fc_pci->init_state |= FC_PCI_INIT;321 return ret;322 323err_pci_iounmap:324 pci_iounmap(fc_pci->pdev, fc_pci->io_mem);325err_pci_release_regions:326 pci_release_regions(fc_pci->pdev);327err_pci_disable_device:328 pci_disable_device(fc_pci->pdev);329 return ret;330}331 332static void flexcop_pci_exit(struct flexcop_pci *fc_pci)333{334 if (fc_pci->init_state & FC_PCI_INIT) {335 free_irq(fc_pci->pdev->irq, fc_pci);336 pci_iounmap(fc_pci->pdev, fc_pci->io_mem);337 pci_release_regions(fc_pci->pdev);338 pci_disable_device(fc_pci->pdev);339 }340 fc_pci->init_state &= ~FC_PCI_INIT;341}342 343static int flexcop_pci_probe(struct pci_dev *pdev,344 const struct pci_device_id *ent)345{346 struct flexcop_device *fc;347 struct flexcop_pci *fc_pci;348 int ret = -ENOMEM;349 350 if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {351 err("out of memory\n");352 return -ENOMEM;353 }354 355 /* general flexcop init */356 fc_pci = fc->bus_specific;357 fc_pci->fc_dev = fc;358 359 fc->read_ibi_reg = flexcop_pci_read_ibi_reg;360 fc->write_ibi_reg = flexcop_pci_write_ibi_reg;361 fc->i2c_request = flexcop_i2c_request;362 fc->get_mac_addr = flexcop_eeprom_check_mac_addr;363 fc->stream_control = flexcop_pci_stream_control;364 365 if (enable_pid_filtering)366 info("will use the HW PID filter.");367 else368 info("will pass the complete TS to the demuxer.");369 370 fc->pid_filtering = enable_pid_filtering;371 fc->bus_type = FC_PCI;372 fc->dev = &pdev->dev;373 fc->owner = THIS_MODULE;374 375 /* bus specific part */376 fc_pci->pdev = pdev;377 if ((ret = flexcop_pci_init(fc_pci)) != 0)378 goto err_kfree;379 380 /* init flexcop */381 if ((ret = flexcop_device_initialize(fc)) != 0)382 goto err_pci_exit;383 384 /* init dma */385 if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)386 goto err_fc_exit;387 388 INIT_DELAYED_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work);389 390 if (irq_chk_intv > 0)391 schedule_delayed_work(&fc_pci->irq_check_work,392 msecs_to_jiffies(irq_chk_intv < 100 ?393 100 :394 irq_chk_intv));395 return ret;396 397err_fc_exit:398 flexcop_device_exit(fc);399err_pci_exit:400 flexcop_pci_exit(fc_pci);401err_kfree:402 flexcop_device_kfree(fc);403 return ret;404}405 406/* in theory every _exit function should be called exactly two times,407 * here and in the bail-out-part of the _init-function408 */409static void flexcop_pci_remove(struct pci_dev *pdev)410{411 struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);412 413 if (irq_chk_intv > 0)414 cancel_delayed_work(&fc_pci->irq_check_work);415 416 flexcop_pci_dma_exit(fc_pci);417 flexcop_device_exit(fc_pci->fc_dev);418 flexcop_pci_exit(fc_pci);419 flexcop_device_kfree(fc_pci->fc_dev);420}421 422static const struct pci_device_id flexcop_pci_tbl[] = {423 { PCI_DEVICE(0x13d0, 0x2103) },424 { },425};426 427MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);428 429static struct pci_driver flexcop_pci_driver = {430 .name = "b2c2_flexcop_pci",431 .id_table = flexcop_pci_tbl,432 .probe = flexcop_pci_probe,433 .remove = flexcop_pci_remove,434};435 436module_pci_driver(flexcop_pci_driver);437 438MODULE_AUTHOR(DRIVER_AUTHOR);439MODULE_DESCRIPTION(DRIVER_NAME);440MODULE_LICENSE("GPL");441