Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/net/irda/sa1100_ir.c |
| 3 | * |
| 4 | * Copyright (C) 2000-2001 Russell King |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * Infra-red driver for the StrongARM SA1100 embedded microprocessor |
| 11 | * |
| 12 | * Note that we don't have to worry about the SA1111's DMA bugs in here, |
| 13 | * so we use the straight forward dma_map_* functions with a null pointer. |
| 14 | * |
| 15 | * This driver takes one kernel command line parameter, sa1100ir=, with |
| 16 | * the following options: |
| 17 | * max_rate:baudrate - set the maximum baud rate |
Russell King | 15877e9 | 2012-01-08 12:04:05 +0000 | [diff] [blame] | 18 | * power_level:level - set the transmitter power level |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * tx_lpm:0|1 - set transmit low power mode |
| 20 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/module.h> |
| 22 | #include <linux/moduleparam.h> |
| 23 | #include <linux/types.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/netdevice.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/rtnetlink.h> |
| 29 | #include <linux/interrupt.h> |
| 30 | #include <linux/delay.h> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 31 | #include <linux/platform_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/dma-mapping.h> |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 33 | #include <linux/dmaengine.h> |
| 34 | #include <linux/sa11x0-dma.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include <net/irda/irda.h> |
| 37 | #include <net/irda/wrapper.h> |
| 38 | #include <net/irda/irda_device.h> |
| 39 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 40 | #include <mach/hardware.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <asm/mach/irda.h> |
| 42 | |
| 43 | static int power_level = 3; |
| 44 | static int tx_lpm; |
| 45 | static int max_rate = 4000000; |
| 46 | |
Russell King | 885767c | 2012-01-08 12:53:22 +0000 | [diff] [blame] | 47 | struct sa1100_buf { |
Russell King | 3c500a3 | 2012-01-12 13:56:28 +0000 | [diff] [blame] | 48 | struct device *dev; |
Russell King | 885767c | 2012-01-08 12:53:22 +0000 | [diff] [blame] | 49 | struct sk_buff *skb; |
Russell King | 32273f5 | 2012-01-12 12:45:00 +0000 | [diff] [blame] | 50 | struct scatterlist sg; |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 51 | struct dma_chan *chan; |
| 52 | dma_cookie_t cookie; |
Russell King | 885767c | 2012-01-08 12:53:22 +0000 | [diff] [blame] | 53 | }; |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | struct sa1100_irda { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | unsigned char utcr4; |
| 57 | unsigned char power; |
| 58 | unsigned char open; |
| 59 | |
| 60 | int speed; |
| 61 | int newspeed; |
| 62 | |
Russell King | 885767c | 2012-01-08 12:53:22 +0000 | [diff] [blame] | 63 | struct sa1100_buf dma_rx; |
| 64 | struct sa1100_buf dma_tx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | struct device *dev; |
| 67 | struct irda_platform_data *pdata; |
| 68 | struct irlap_cb *irlap; |
| 69 | struct qos_info qos; |
| 70 | |
| 71 | iobuff_t tx_buff; |
| 72 | iobuff_t rx_buff; |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 73 | |
| 74 | int (*tx_start)(struct sk_buff *, struct net_device *, struct sa1100_irda *); |
Russell King | 374f773 | 2012-01-08 16:26:15 +0000 | [diff] [blame] | 75 | irqreturn_t (*irq)(struct net_device *, struct sa1100_irda *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | }; |
| 77 | |
Russell King | 0e888ee | 2012-01-08 16:30:44 +0000 | [diff] [blame] | 78 | static int sa1100_irda_set_speed(struct sa1100_irda *, int); |
| 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | #define IS_FIR(si) ((si)->speed >= 4000000) |
| 81 | |
| 82 | #define HPSIR_MAX_RXLEN 2047 |
| 83 | |
Russell King | d138dac | 2012-01-13 11:50:03 +0000 | [diff] [blame] | 84 | static struct dma_slave_config sa1100_irda_sir_tx = { |
| 85 | .direction = DMA_TO_DEVICE, |
| 86 | .dst_addr = __PREG(Ser2UTDR), |
| 87 | .dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE, |
| 88 | .dst_maxburst = 4, |
| 89 | }; |
| 90 | |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 91 | static struct dma_slave_config sa1100_irda_fir_rx = { |
| 92 | .direction = DMA_FROM_DEVICE, |
| 93 | .src_addr = __PREG(Ser2HSDR), |
| 94 | .src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE, |
| 95 | .src_maxburst = 8, |
| 96 | }; |
| 97 | |
| 98 | static struct dma_slave_config sa1100_irda_fir_tx = { |
| 99 | .direction = DMA_TO_DEVICE, |
| 100 | .dst_addr = __PREG(Ser2HSDR), |
| 101 | .dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE, |
| 102 | .dst_maxburst = 8, |
| 103 | }; |
| 104 | |
| 105 | static unsigned sa1100_irda_dma_xferred(struct sa1100_buf *buf) |
| 106 | { |
| 107 | struct dma_chan *chan = buf->chan; |
| 108 | struct dma_tx_state state; |
| 109 | enum dma_status status; |
| 110 | |
| 111 | status = chan->device->device_tx_status(chan, buf->cookie, &state); |
| 112 | if (status != DMA_PAUSED) |
| 113 | return 0; |
| 114 | |
| 115 | return sg_dma_len(&buf->sg) - state.residue; |
| 116 | } |
| 117 | |
| 118 | static int sa1100_irda_dma_request(struct device *dev, struct sa1100_buf *buf, |
| 119 | const char *name, struct dma_slave_config *cfg) |
| 120 | { |
| 121 | dma_cap_mask_t m; |
| 122 | int ret; |
| 123 | |
| 124 | dma_cap_zero(m); |
| 125 | dma_cap_set(DMA_SLAVE, m); |
| 126 | |
| 127 | buf->chan = dma_request_channel(m, sa11x0_dma_filter_fn, (void *)name); |
| 128 | if (!buf->chan) { |
| 129 | dev_err(dev, "unable to request DMA channel for %s\n", |
| 130 | name); |
| 131 | return -ENOENT; |
| 132 | } |
| 133 | |
| 134 | ret = dmaengine_slave_config(buf->chan, cfg); |
| 135 | if (ret) |
| 136 | dev_warn(dev, "DMA slave_config for %s returned %d\n", |
| 137 | name, ret); |
| 138 | |
| 139 | buf->dev = buf->chan->device->dev; |
| 140 | |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | static void sa1100_irda_dma_start(struct sa1100_buf *buf, |
| 145 | enum dma_transfer_direction dir, dma_async_tx_callback cb, void *cb_p) |
| 146 | { |
| 147 | struct dma_async_tx_descriptor *desc; |
| 148 | struct dma_chan *chan = buf->chan; |
| 149 | |
Russell King | d9d5454 | 2012-03-30 11:44:15 +0100 | [diff] [blame] | 150 | desc = dmaengine_prep_slave_sg(chan, &buf->sg, 1, dir, |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 151 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
| 152 | if (desc) { |
| 153 | desc->callback = cb; |
| 154 | desc->callback_param = cb_p; |
| 155 | buf->cookie = dmaengine_submit(desc); |
| 156 | dma_async_issue_pending(chan); |
| 157 | } |
| 158 | } |
| 159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | /* |
| 161 | * Allocate and map the receive buffer, unless it is already allocated. |
| 162 | */ |
| 163 | static int sa1100_irda_rx_alloc(struct sa1100_irda *si) |
| 164 | { |
Russell King | 885767c | 2012-01-08 12:53:22 +0000 | [diff] [blame] | 165 | if (si->dma_rx.skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | return 0; |
| 167 | |
Russell King | 885767c | 2012-01-08 12:53:22 +0000 | [diff] [blame] | 168 | si->dma_rx.skb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC); |
| 169 | if (!si->dma_rx.skb) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | printk(KERN_ERR "sa1100_ir: out of memory for RX SKB\n"); |
| 171 | return -ENOMEM; |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | * Align any IP headers that may be contained |
| 176 | * within the frame. |
| 177 | */ |
Russell King | 885767c | 2012-01-08 12:53:22 +0000 | [diff] [blame] | 178 | skb_reserve(si->dma_rx.skb, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
Russell King | 32273f5 | 2012-01-12 12:45:00 +0000 | [diff] [blame] | 180 | sg_set_buf(&si->dma_rx.sg, si->dma_rx.skb->data, HPSIR_MAX_RXLEN); |
Russell King | 3c500a3 | 2012-01-12 13:56:28 +0000 | [diff] [blame] | 181 | if (dma_map_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE) == 0) { |
Russell King | 885767c | 2012-01-08 12:53:22 +0000 | [diff] [blame] | 182 | dev_kfree_skb_any(si->dma_rx.skb); |
Russell King | 22f0bf9 | 2012-01-08 13:55:23 +0000 | [diff] [blame] | 183 | return -ENOMEM; |
| 184 | } |
| 185 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * We want to get here as soon as possible, and get the receiver setup. |
| 191 | * We use the existing buffer. |
| 192 | */ |
| 193 | static void sa1100_irda_rx_dma_start(struct sa1100_irda *si) |
| 194 | { |
Russell King | 885767c | 2012-01-08 12:53:22 +0000 | [diff] [blame] | 195 | if (!si->dma_rx.skb) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | printk(KERN_ERR "sa1100_ir: rx buffer went missing\n"); |
| 197 | return; |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | * First empty receive FIFO |
| 202 | */ |
Russell King | 6a7f491 | 2012-01-08 20:49:28 +0000 | [diff] [blame] | 203 | Ser2HSCR0 = HSCR0_HSSP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
| 205 | /* |
| 206 | * Enable the DMA, receiver and receive interrupt. |
| 207 | */ |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 208 | dmaengine_terminate_all(si->dma_rx.chan); |
| 209 | sa1100_irda_dma_start(&si->dma_rx, DMA_DEV_TO_MEM, NULL, NULL); |
| 210 | |
Russell King | 6a7f491 | 2012-01-08 20:49:28 +0000 | [diff] [blame] | 211 | Ser2HSCR0 = HSCR0_HSSP | HSCR0_RXE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
Russell King | 0e888ee | 2012-01-08 16:30:44 +0000 | [diff] [blame] | 214 | static void sa1100_irda_check_speed(struct sa1100_irda *si) |
| 215 | { |
| 216 | if (si->newspeed) { |
| 217 | sa1100_irda_set_speed(si, si->newspeed); |
| 218 | si->newspeed = 0; |
| 219 | } |
| 220 | } |
| 221 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | /* |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 223 | * HP-SIR format support. |
| 224 | */ |
Russell King | d138dac | 2012-01-13 11:50:03 +0000 | [diff] [blame] | 225 | static void sa1100_irda_sirtxdma_irq(void *id) |
| 226 | { |
| 227 | struct net_device *dev = id; |
| 228 | struct sa1100_irda *si = netdev_priv(dev); |
| 229 | |
| 230 | dma_unmap_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE); |
| 231 | dev_kfree_skb(si->dma_tx.skb); |
| 232 | si->dma_tx.skb = NULL; |
| 233 | |
| 234 | dev->stats.tx_packets++; |
| 235 | dev->stats.tx_bytes += sg_dma_len(&si->dma_tx.sg); |
| 236 | |
| 237 | /* We need to ensure that the transmitter has finished. */ |
| 238 | do |
| 239 | rmb(); |
| 240 | while (Ser2UTSR1 & UTSR1_TBY); |
| 241 | |
| 242 | /* |
| 243 | * Ok, we've finished transmitting. Now enable the receiver. |
| 244 | * Sometimes we get a receive IRQ immediately after a transmit... |
| 245 | */ |
| 246 | Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID; |
| 247 | Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE; |
| 248 | |
| 249 | sa1100_irda_check_speed(si); |
| 250 | |
| 251 | /* I'm hungry! */ |
| 252 | netif_wake_queue(dev); |
| 253 | } |
| 254 | |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 255 | static int sa1100_irda_sir_tx_start(struct sk_buff *skb, struct net_device *dev, |
| 256 | struct sa1100_irda *si) |
| 257 | { |
| 258 | si->tx_buff.data = si->tx_buff.head; |
| 259 | si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data, |
| 260 | si->tx_buff.truesize); |
| 261 | |
Russell King | d138dac | 2012-01-13 11:50:03 +0000 | [diff] [blame] | 262 | si->dma_tx.skb = skb; |
| 263 | sg_set_buf(&si->dma_tx.sg, si->tx_buff.data, si->tx_buff.len); |
| 264 | if (dma_map_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE) == 0) { |
| 265 | si->dma_tx.skb = NULL; |
| 266 | netif_wake_queue(dev); |
| 267 | dev->stats.tx_dropped++; |
| 268 | return NETDEV_TX_OK; |
| 269 | } |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 270 | |
Russell King | d138dac | 2012-01-13 11:50:03 +0000 | [diff] [blame] | 271 | sa1100_irda_dma_start(&si->dma_tx, DMA_MEM_TO_DEV, sa1100_irda_sirtxdma_irq, dev); |
| 272 | |
| 273 | /* |
| 274 | * The mean turn-around time is enforced by XBOF padding, |
| 275 | * so we don't have to do anything special here. |
| 276 | */ |
| 277 | Ser2UTCR3 = UTCR3_TXE; |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 278 | |
| 279 | return NETDEV_TX_OK; |
| 280 | } |
| 281 | |
Russell King | a6b2ea6 | 2012-01-08 17:10:01 +0000 | [diff] [blame] | 282 | static irqreturn_t sa1100_irda_sir_irq(struct net_device *dev, struct sa1100_irda *si) |
| 283 | { |
| 284 | int status; |
| 285 | |
| 286 | status = Ser2UTSR0; |
| 287 | |
| 288 | /* |
| 289 | * Deal with any receive errors first. The bytes in error may be |
| 290 | * the only bytes in the receive FIFO, so we do this first. |
| 291 | */ |
| 292 | while (status & UTSR0_EIF) { |
| 293 | int stat, data; |
| 294 | |
| 295 | stat = Ser2UTSR1; |
| 296 | data = Ser2UTDR; |
| 297 | |
| 298 | if (stat & (UTSR1_FRE | UTSR1_ROR)) { |
| 299 | dev->stats.rx_errors++; |
| 300 | if (stat & UTSR1_FRE) |
| 301 | dev->stats.rx_frame_errors++; |
| 302 | if (stat & UTSR1_ROR) |
| 303 | dev->stats.rx_fifo_errors++; |
| 304 | } else |
| 305 | async_unwrap_char(dev, &dev->stats, &si->rx_buff, data); |
| 306 | |
| 307 | status = Ser2UTSR0; |
| 308 | } |
| 309 | |
| 310 | /* |
| 311 | * We must clear certain bits. |
| 312 | */ |
| 313 | Ser2UTSR0 = status & (UTSR0_RID | UTSR0_RBB | UTSR0_REB); |
| 314 | |
| 315 | if (status & UTSR0_RFS) { |
| 316 | /* |
| 317 | * There are at least 4 bytes in the FIFO. Read 3 bytes |
| 318 | * and leave the rest to the block below. |
| 319 | */ |
| 320 | async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR); |
| 321 | async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR); |
| 322 | async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR); |
| 323 | } |
| 324 | |
| 325 | if (status & (UTSR0_RFS | UTSR0_RID)) { |
| 326 | /* |
| 327 | * Fifo contains more than 1 character. |
| 328 | */ |
| 329 | do { |
| 330 | async_unwrap_char(dev, &dev->stats, &si->rx_buff, |
| 331 | Ser2UTDR); |
| 332 | } while (Ser2UTSR1 & UTSR1_RNE); |
| 333 | |
| 334 | } |
| 335 | |
Russell King | a6b2ea6 | 2012-01-08 17:10:01 +0000 | [diff] [blame] | 336 | return IRQ_HANDLED; |
| 337 | } |
| 338 | |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 339 | /* |
| 340 | * FIR format support. |
| 341 | */ |
Russell King | 26f2bee | 2012-01-08 17:48:02 +0000 | [diff] [blame] | 342 | static void sa1100_irda_firtxdma_irq(void *id) |
| 343 | { |
| 344 | struct net_device *dev = id; |
| 345 | struct sa1100_irda *si = netdev_priv(dev); |
| 346 | struct sk_buff *skb; |
| 347 | |
| 348 | /* |
| 349 | * Wait for the transmission to complete. Unfortunately, |
| 350 | * the hardware doesn't give us an interrupt to indicate |
| 351 | * "end of frame". |
| 352 | */ |
| 353 | do |
| 354 | rmb(); |
| 355 | while (!(Ser2HSSR0 & HSSR0_TUR) || Ser2HSSR1 & HSSR1_TBY); |
| 356 | |
| 357 | /* |
| 358 | * Clear the transmit underrun bit. |
| 359 | */ |
| 360 | Ser2HSSR0 = HSSR0_TUR; |
| 361 | |
| 362 | /* |
| 363 | * Do we need to change speed? Note that we're lazy |
| 364 | * here - we don't free the old dma_rx.skb. We don't need |
| 365 | * to allocate a buffer either. |
| 366 | */ |
| 367 | sa1100_irda_check_speed(si); |
| 368 | |
| 369 | /* |
| 370 | * Start reception. This disables the transmitter for |
| 371 | * us. This will be using the existing RX buffer. |
| 372 | */ |
| 373 | sa1100_irda_rx_dma_start(si); |
| 374 | |
| 375 | /* Account and free the packet. */ |
| 376 | skb = si->dma_tx.skb; |
| 377 | if (skb) { |
Russell King | 3c500a3 | 2012-01-12 13:56:28 +0000 | [diff] [blame] | 378 | dma_unmap_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, |
Russell King | 32273f5 | 2012-01-12 12:45:00 +0000 | [diff] [blame] | 379 | DMA_TO_DEVICE); |
Russell King | 26f2bee | 2012-01-08 17:48:02 +0000 | [diff] [blame] | 380 | dev->stats.tx_packets ++; |
| 381 | dev->stats.tx_bytes += skb->len; |
| 382 | dev_kfree_skb_irq(skb); |
| 383 | si->dma_tx.skb = NULL; |
| 384 | } |
| 385 | |
| 386 | /* |
| 387 | * Make sure that the TX queue is available for sending |
| 388 | * (for retries). TX has priority over RX at all times. |
| 389 | */ |
| 390 | netif_wake_queue(dev); |
| 391 | } |
| 392 | |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 393 | static int sa1100_irda_fir_tx_start(struct sk_buff *skb, struct net_device *dev, |
| 394 | struct sa1100_irda *si) |
| 395 | { |
| 396 | int mtt = irda_get_mtt(skb); |
| 397 | |
| 398 | si->dma_tx.skb = skb; |
Russell King | 32273f5 | 2012-01-12 12:45:00 +0000 | [diff] [blame] | 399 | sg_set_buf(&si->dma_tx.sg, skb->data, skb->len); |
Russell King | 3c500a3 | 2012-01-12 13:56:28 +0000 | [diff] [blame] | 400 | if (dma_map_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE) == 0) { |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 401 | si->dma_tx.skb = NULL; |
| 402 | netif_wake_queue(dev); |
| 403 | dev->stats.tx_dropped++; |
| 404 | dev_kfree_skb(skb); |
| 405 | return NETDEV_TX_OK; |
| 406 | } |
| 407 | |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 408 | sa1100_irda_dma_start(&si->dma_tx, DMA_MEM_TO_DEV, sa1100_irda_firtxdma_irq, dev); |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 409 | |
| 410 | /* |
| 411 | * If we have a mean turn-around time, impose the specified |
| 412 | * specified delay. We could shorten this by timing from |
| 413 | * the point we received the packet. |
| 414 | */ |
| 415 | if (mtt) |
| 416 | udelay(mtt); |
| 417 | |
Russell King | 6a7f491 | 2012-01-08 20:49:28 +0000 | [diff] [blame] | 418 | Ser2HSCR0 = HSCR0_HSSP | HSCR0_TXE; |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 419 | |
| 420 | return NETDEV_TX_OK; |
| 421 | } |
| 422 | |
Russell King | a6b2ea6 | 2012-01-08 17:10:01 +0000 | [diff] [blame] | 423 | static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev) |
| 424 | { |
| 425 | struct sk_buff *skb = si->dma_rx.skb; |
Russell King | a6b2ea6 | 2012-01-08 17:10:01 +0000 | [diff] [blame] | 426 | unsigned int len, stat, data; |
| 427 | |
| 428 | if (!skb) { |
| 429 | printk(KERN_ERR "sa1100_ir: SKB is NULL!\n"); |
| 430 | return; |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * Get the current data position. |
| 435 | */ |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 436 | len = sa1100_irda_dma_xferred(&si->dma_rx); |
Russell King | a6b2ea6 | 2012-01-08 17:10:01 +0000 | [diff] [blame] | 437 | if (len > HPSIR_MAX_RXLEN) |
| 438 | len = HPSIR_MAX_RXLEN; |
Russell King | 3c500a3 | 2012-01-12 13:56:28 +0000 | [diff] [blame] | 439 | dma_unmap_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE); |
Russell King | a6b2ea6 | 2012-01-08 17:10:01 +0000 | [diff] [blame] | 440 | |
| 441 | do { |
| 442 | /* |
| 443 | * Read Status, and then Data. |
| 444 | */ |
| 445 | stat = Ser2HSSR1; |
| 446 | rmb(); |
| 447 | data = Ser2HSDR; |
| 448 | |
| 449 | if (stat & (HSSR1_CRE | HSSR1_ROR)) { |
| 450 | dev->stats.rx_errors++; |
| 451 | if (stat & HSSR1_CRE) |
| 452 | dev->stats.rx_crc_errors++; |
| 453 | if (stat & HSSR1_ROR) |
| 454 | dev->stats.rx_frame_errors++; |
| 455 | } else |
| 456 | skb->data[len++] = data; |
| 457 | |
| 458 | /* |
| 459 | * If we hit the end of frame, there's |
| 460 | * no point in continuing. |
| 461 | */ |
| 462 | if (stat & HSSR1_EOF) |
| 463 | break; |
| 464 | } while (Ser2HSSR0 & HSSR0_EIF); |
| 465 | |
| 466 | if (stat & HSSR1_EOF) { |
| 467 | si->dma_rx.skb = NULL; |
| 468 | |
| 469 | skb_put(skb, len); |
| 470 | skb->dev = dev; |
| 471 | skb_reset_mac_header(skb); |
| 472 | skb->protocol = htons(ETH_P_IRDA); |
| 473 | dev->stats.rx_packets++; |
| 474 | dev->stats.rx_bytes += len; |
| 475 | |
| 476 | /* |
| 477 | * Before we pass the buffer up, allocate a new one. |
| 478 | */ |
| 479 | sa1100_irda_rx_alloc(si); |
| 480 | |
| 481 | netif_rx(skb); |
| 482 | } else { |
| 483 | /* |
| 484 | * Remap the buffer - it was previously mapped, and we |
| 485 | * hope that this succeeds. |
| 486 | */ |
Russell King | 3c500a3 | 2012-01-12 13:56:28 +0000 | [diff] [blame] | 487 | dma_map_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE); |
Russell King | a6b2ea6 | 2012-01-08 17:10:01 +0000 | [diff] [blame] | 488 | } |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * We only have to handle RX events here; transmit events go via the TX |
| 493 | * DMA handler. We disable RX, process, and the restart RX. |
| 494 | */ |
| 495 | static irqreturn_t sa1100_irda_fir_irq(struct net_device *dev, struct sa1100_irda *si) |
| 496 | { |
| 497 | /* |
| 498 | * Stop RX DMA |
| 499 | */ |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 500 | dmaengine_pause(si->dma_rx.chan); |
Russell King | a6b2ea6 | 2012-01-08 17:10:01 +0000 | [diff] [blame] | 501 | |
| 502 | /* |
| 503 | * Framing error - we throw away the packet completely. |
| 504 | * Clearing RXE flushes the error conditions and data |
| 505 | * from the fifo. |
| 506 | */ |
| 507 | if (Ser2HSSR0 & (HSSR0_FRE | HSSR0_RAB)) { |
| 508 | dev->stats.rx_errors++; |
| 509 | |
| 510 | if (Ser2HSSR0 & HSSR0_FRE) |
| 511 | dev->stats.rx_frame_errors++; |
| 512 | |
| 513 | /* |
| 514 | * Clear out the DMA... |
| 515 | */ |
Russell King | 6a7f491 | 2012-01-08 20:49:28 +0000 | [diff] [blame] | 516 | Ser2HSCR0 = HSCR0_HSSP; |
Russell King | a6b2ea6 | 2012-01-08 17:10:01 +0000 | [diff] [blame] | 517 | |
| 518 | /* |
| 519 | * Clear selected status bits now, so we |
| 520 | * don't miss them next time around. |
| 521 | */ |
| 522 | Ser2HSSR0 = HSSR0_FRE | HSSR0_RAB; |
| 523 | } |
| 524 | |
| 525 | /* |
| 526 | * Deal with any receive errors. The any of the lowest |
| 527 | * 8 bytes in the FIFO may contain an error. We must read |
| 528 | * them one by one. The "error" could even be the end of |
| 529 | * packet! |
| 530 | */ |
| 531 | if (Ser2HSSR0 & HSSR0_EIF) |
| 532 | sa1100_irda_fir_error(si, dev); |
| 533 | |
| 534 | /* |
| 535 | * No matter what happens, we must restart reception. |
| 536 | */ |
| 537 | sa1100_irda_rx_dma_start(si); |
| 538 | |
| 539 | return IRQ_HANDLED; |
| 540 | } |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 541 | |
| 542 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | * Set the IrDA communications speed. |
| 544 | */ |
| 545 | static int sa1100_irda_set_speed(struct sa1100_irda *si, int speed) |
| 546 | { |
| 547 | unsigned long flags; |
| 548 | int brd, ret = -EINVAL; |
| 549 | |
| 550 | switch (speed) { |
| 551 | case 9600: case 19200: case 38400: |
| 552 | case 57600: case 115200: |
| 553 | brd = 3686400 / (16 * speed) - 1; |
| 554 | |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 555 | /* Stop the receive DMA, and configure transmit. */ |
Russell King | d138dac | 2012-01-13 11:50:03 +0000 | [diff] [blame] | 556 | if (IS_FIR(si)) { |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 557 | dmaengine_terminate_all(si->dma_rx.chan); |
Russell King | d138dac | 2012-01-13 11:50:03 +0000 | [diff] [blame] | 558 | dmaengine_slave_config(si->dma_tx.chan, |
| 559 | &sa1100_irda_sir_tx); |
| 560 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
| 562 | local_irq_save(flags); |
| 563 | |
| 564 | Ser2UTCR3 = 0; |
| 565 | Ser2HSCR0 = HSCR0_UART; |
| 566 | |
| 567 | Ser2UTCR1 = brd >> 8; |
| 568 | Ser2UTCR2 = brd; |
| 569 | |
| 570 | /* |
| 571 | * Clear status register |
| 572 | */ |
| 573 | Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID; |
| 574 | Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE; |
| 575 | |
| 576 | if (si->pdata->set_speed) |
| 577 | si->pdata->set_speed(si->dev, speed); |
| 578 | |
| 579 | si->speed = speed; |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 580 | si->tx_start = sa1100_irda_sir_tx_start; |
Russell King | 374f773 | 2012-01-08 16:26:15 +0000 | [diff] [blame] | 581 | si->irq = sa1100_irda_sir_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
| 583 | local_irq_restore(flags); |
| 584 | ret = 0; |
| 585 | break; |
| 586 | |
| 587 | case 4000000: |
Russell King | d138dac | 2012-01-13 11:50:03 +0000 | [diff] [blame] | 588 | if (!IS_FIR(si)) |
| 589 | dmaengine_slave_config(si->dma_tx.chan, |
| 590 | &sa1100_irda_fir_tx); |
| 591 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | local_irq_save(flags); |
| 593 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | Ser2HSSR0 = 0xff; |
Russell King | 6a7f491 | 2012-01-08 20:49:28 +0000 | [diff] [blame] | 595 | Ser2HSCR0 = HSCR0_HSSP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | Ser2UTCR3 = 0; |
| 597 | |
| 598 | si->speed = speed; |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 599 | si->tx_start = sa1100_irda_fir_tx_start; |
Russell King | 374f773 | 2012-01-08 16:26:15 +0000 | [diff] [blame] | 600 | si->irq = sa1100_irda_fir_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | |
| 602 | if (si->pdata->set_speed) |
| 603 | si->pdata->set_speed(si->dev, speed); |
| 604 | |
| 605 | sa1100_irda_rx_alloc(si); |
| 606 | sa1100_irda_rx_dma_start(si); |
| 607 | |
| 608 | local_irq_restore(flags); |
| 609 | |
| 610 | break; |
| 611 | |
| 612 | default: |
| 613 | break; |
| 614 | } |
| 615 | |
| 616 | return ret; |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * Control the power state of the IrDA transmitter. |
| 621 | * State: |
| 622 | * 0 - off |
| 623 | * 1 - short range, lowest power |
| 624 | * 2 - medium range, medium power |
| 625 | * 3 - maximum range, high power |
| 626 | * |
| 627 | * Currently, only assabet is known to support this. |
| 628 | */ |
| 629 | static int |
| 630 | __sa1100_irda_set_power(struct sa1100_irda *si, unsigned int state) |
| 631 | { |
| 632 | int ret = 0; |
| 633 | if (si->pdata->set_power) |
| 634 | ret = si->pdata->set_power(si->dev, state); |
| 635 | return ret; |
| 636 | } |
| 637 | |
| 638 | static inline int |
| 639 | sa1100_set_power(struct sa1100_irda *si, unsigned int state) |
| 640 | { |
| 641 | int ret; |
| 642 | |
| 643 | ret = __sa1100_irda_set_power(si, state); |
| 644 | if (ret == 0) |
| 645 | si->power = state; |
| 646 | |
| 647 | return ret; |
| 648 | } |
| 649 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 650 | static irqreturn_t sa1100_irda_irq(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | { |
| 652 | struct net_device *dev = dev_id; |
Russell King | 374f773 | 2012-01-08 16:26:15 +0000 | [diff] [blame] | 653 | struct sa1100_irda *si = netdev_priv(dev); |
| 654 | |
| 655 | return si->irq(dev, si); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | } |
| 657 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev) |
| 659 | { |
Wang Chen | 4cf1653 | 2008-11-12 23:38:14 -0800 | [diff] [blame] | 660 | struct sa1100_irda *si = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | int speed = irda_get_next_speed(skb); |
| 662 | |
| 663 | /* |
| 664 | * Does this packet contain a request to change the interface |
| 665 | * speed? If so, remember it until we complete the transmission |
| 666 | * of this frame. |
| 667 | */ |
| 668 | if (speed != si->speed && speed != -1) |
| 669 | si->newspeed = speed; |
| 670 | |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 671 | /* If this is an empty frame, we can bypass a lot. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | if (skb->len == 0) { |
Russell King | 0e888ee | 2012-01-08 16:30:44 +0000 | [diff] [blame] | 673 | sa1100_irda_check_speed(si); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | dev_kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 675 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
| 677 | |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 678 | netif_stop_queue(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 680 | /* We must not already have a skb to transmit... */ |
| 681 | BUG_ON(si->dma_tx.skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
Russell King | 3d26db1 | 2012-01-08 16:16:39 +0000 | [diff] [blame] | 683 | return si->tx_start(skb, dev, si); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | } |
| 685 | |
| 686 | static int |
| 687 | sa1100_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd) |
| 688 | { |
| 689 | struct if_irda_req *rq = (struct if_irda_req *)ifreq; |
Wang Chen | 4cf1653 | 2008-11-12 23:38:14 -0800 | [diff] [blame] | 690 | struct sa1100_irda *si = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | int ret = -EOPNOTSUPP; |
| 692 | |
| 693 | switch (cmd) { |
| 694 | case SIOCSBANDWIDTH: |
| 695 | if (capable(CAP_NET_ADMIN)) { |
| 696 | /* |
| 697 | * We are unable to set the speed if the |
| 698 | * device is not running. |
| 699 | */ |
| 700 | if (si->open) { |
| 701 | ret = sa1100_irda_set_speed(si, |
| 702 | rq->ifr_baudrate); |
| 703 | } else { |
| 704 | printk("sa1100_irda_ioctl: SIOCSBANDWIDTH: !netif_running\n"); |
| 705 | ret = 0; |
| 706 | } |
| 707 | } |
| 708 | break; |
| 709 | |
| 710 | case SIOCSMEDIABUSY: |
| 711 | ret = -EPERM; |
| 712 | if (capable(CAP_NET_ADMIN)) { |
| 713 | irda_device_set_media_busy(dev, TRUE); |
| 714 | ret = 0; |
| 715 | } |
| 716 | break; |
| 717 | |
| 718 | case SIOCGRECEIVING: |
| 719 | rq->ifr_receiving = IS_FIR(si) ? 0 |
| 720 | : si->rx_buff.state != OUTSIDE_FRAME; |
| 721 | break; |
| 722 | |
| 723 | default: |
| 724 | break; |
| 725 | } |
| 726 | |
| 727 | return ret; |
| 728 | } |
| 729 | |
Russell King | cbe1d24 | 2012-01-08 16:40:07 +0000 | [diff] [blame] | 730 | static int sa1100_irda_startup(struct sa1100_irda *si) |
| 731 | { |
| 732 | int ret; |
| 733 | |
| 734 | /* |
| 735 | * Ensure that the ports for this device are setup correctly. |
| 736 | */ |
| 737 | if (si->pdata->startup) { |
| 738 | ret = si->pdata->startup(si->dev); |
| 739 | if (ret) |
| 740 | return ret; |
| 741 | } |
| 742 | |
| 743 | /* |
| 744 | * Configure PPC for IRDA - we want to drive TXD2 low. |
| 745 | * We also want to drive this pin low during sleep. |
| 746 | */ |
| 747 | PPSR &= ~PPC_TXD2; |
| 748 | PSDR &= ~PPC_TXD2; |
| 749 | PPDR |= PPC_TXD2; |
| 750 | |
| 751 | /* |
| 752 | * Enable HP-SIR modulation, and ensure that the port is disabled. |
| 753 | */ |
| 754 | Ser2UTCR3 = 0; |
| 755 | Ser2HSCR0 = HSCR0_UART; |
| 756 | Ser2UTCR4 = si->utcr4; |
| 757 | Ser2UTCR0 = UTCR0_8BitData; |
| 758 | Ser2HSCR2 = HSCR2_TrDataH | HSCR2_RcDataL; |
| 759 | |
| 760 | /* |
| 761 | * Clear status register |
| 762 | */ |
| 763 | Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID; |
| 764 | |
| 765 | ret = sa1100_irda_set_speed(si, si->speed = 9600); |
| 766 | if (ret) { |
| 767 | Ser2UTCR3 = 0; |
| 768 | Ser2HSCR0 = 0; |
| 769 | |
| 770 | if (si->pdata->shutdown) |
| 771 | si->pdata->shutdown(si->dev); |
| 772 | } |
| 773 | |
| 774 | return ret; |
| 775 | } |
| 776 | |
| 777 | static void sa1100_irda_shutdown(struct sa1100_irda *si) |
| 778 | { |
| 779 | /* |
| 780 | * Stop all DMA activity. |
| 781 | */ |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 782 | dmaengine_terminate_all(si->dma_rx.chan); |
| 783 | dmaengine_terminate_all(si->dma_tx.chan); |
Russell King | cbe1d24 | 2012-01-08 16:40:07 +0000 | [diff] [blame] | 784 | |
| 785 | /* Disable the port. */ |
| 786 | Ser2UTCR3 = 0; |
| 787 | Ser2HSCR0 = 0; |
| 788 | |
| 789 | if (si->pdata->shutdown) |
| 790 | si->pdata->shutdown(si->dev); |
| 791 | } |
| 792 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | static int sa1100_irda_start(struct net_device *dev) |
| 794 | { |
Wang Chen | 4cf1653 | 2008-11-12 23:38:14 -0800 | [diff] [blame] | 795 | struct sa1100_irda *si = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | int err; |
| 797 | |
| 798 | si->speed = 9600; |
| 799 | |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 800 | err = sa1100_irda_dma_request(si->dev, &si->dma_rx, "Ser2ICPRc", |
| 801 | &sa1100_irda_fir_rx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | if (err) |
| 803 | goto err_rx_dma; |
| 804 | |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 805 | err = sa1100_irda_dma_request(si->dev, &si->dma_tx, "Ser2ICPTr", |
| 806 | &sa1100_irda_sir_tx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | if (err) |
| 808 | goto err_tx_dma; |
| 809 | |
| 810 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | * Setup the serial port for the specified speed. |
| 812 | */ |
| 813 | err = sa1100_irda_startup(si); |
| 814 | if (err) |
| 815 | goto err_startup; |
| 816 | |
| 817 | /* |
| 818 | * Open a new IrLAP layer instance. |
| 819 | */ |
| 820 | si->irlap = irlap_open(dev, &si->qos, "sa1100"); |
| 821 | err = -ENOMEM; |
| 822 | if (!si->irlap) |
| 823 | goto err_irlap; |
| 824 | |
Russell King | 374f773 | 2012-01-08 16:26:15 +0000 | [diff] [blame] | 825 | err = request_irq(dev->irq, sa1100_irda_irq, 0, dev->name, dev); |
| 826 | if (err) |
| 827 | goto err_irq; |
| 828 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | /* |
| 830 | * Now enable the interrupt and start the queue |
| 831 | */ |
| 832 | si->open = 1; |
| 833 | sa1100_set_power(si, power_level); /* low power mode */ |
Russell King | 374f773 | 2012-01-08 16:26:15 +0000 | [diff] [blame] | 834 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | netif_start_queue(dev); |
| 836 | return 0; |
| 837 | |
Russell King | 374f773 | 2012-01-08 16:26:15 +0000 | [diff] [blame] | 838 | err_irq: |
| 839 | irlap_close(si->irlap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | err_irlap: |
| 841 | si->open = 0; |
| 842 | sa1100_irda_shutdown(si); |
| 843 | err_startup: |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 844 | dma_release_channel(si->dma_tx.chan); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | err_tx_dma: |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 846 | dma_release_channel(si->dma_rx.chan); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | err_rx_dma: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | return err; |
| 849 | } |
| 850 | |
| 851 | static int sa1100_irda_stop(struct net_device *dev) |
| 852 | { |
Wang Chen | 4cf1653 | 2008-11-12 23:38:14 -0800 | [diff] [blame] | 853 | struct sa1100_irda *si = netdev_priv(dev); |
Russell King | ba84525 | 2012-01-08 15:38:15 +0000 | [diff] [blame] | 854 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
Russell King | 374f773 | 2012-01-08 16:26:15 +0000 | [diff] [blame] | 856 | netif_stop_queue(dev); |
| 857 | |
| 858 | si->open = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | sa1100_irda_shutdown(si); |
| 860 | |
| 861 | /* |
Russell King | ba84525 | 2012-01-08 15:38:15 +0000 | [diff] [blame] | 862 | * If we have been doing any DMA activity, make sure we |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | * tidy that up cleanly. |
| 864 | */ |
Russell King | ba84525 | 2012-01-08 15:38:15 +0000 | [diff] [blame] | 865 | skb = si->dma_rx.skb; |
| 866 | if (skb) { |
Russell King | 3c500a3 | 2012-01-12 13:56:28 +0000 | [diff] [blame] | 867 | dma_unmap_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, |
Russell King | 32273f5 | 2012-01-12 12:45:00 +0000 | [diff] [blame] | 868 | DMA_FROM_DEVICE); |
Russell King | ba84525 | 2012-01-08 15:38:15 +0000 | [diff] [blame] | 869 | dev_kfree_skb(skb); |
Russell King | 885767c | 2012-01-08 12:53:22 +0000 | [diff] [blame] | 870 | si->dma_rx.skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | } |
| 872 | |
Russell King | ba84525 | 2012-01-08 15:38:15 +0000 | [diff] [blame] | 873 | skb = si->dma_tx.skb; |
| 874 | if (skb) { |
Russell King | 3c500a3 | 2012-01-12 13:56:28 +0000 | [diff] [blame] | 875 | dma_unmap_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, |
Russell King | 32273f5 | 2012-01-12 12:45:00 +0000 | [diff] [blame] | 876 | DMA_TO_DEVICE); |
Russell King | ba84525 | 2012-01-08 15:38:15 +0000 | [diff] [blame] | 877 | dev_kfree_skb(skb); |
| 878 | si->dma_tx.skb = NULL; |
| 879 | } |
| 880 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | /* Stop IrLAP */ |
| 882 | if (si->irlap) { |
| 883 | irlap_close(si->irlap); |
| 884 | si->irlap = NULL; |
| 885 | } |
| 886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | /* |
| 888 | * Free resources |
| 889 | */ |
Russell King | bf95154 | 2012-01-13 11:48:13 +0000 | [diff] [blame] | 890 | dma_release_channel(si->dma_tx.chan); |
| 891 | dma_release_channel(si->dma_rx.chan); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | free_irq(dev->irq, dev); |
| 893 | |
| 894 | sa1100_set_power(si, 0); |
| 895 | |
| 896 | return 0; |
| 897 | } |
| 898 | |
| 899 | static int sa1100_irda_init_iobuf(iobuff_t *io, int size) |
| 900 | { |
| 901 | io->head = kmalloc(size, GFP_KERNEL | GFP_DMA); |
| 902 | if (io->head != NULL) { |
| 903 | io->truesize = size; |
| 904 | io->in_frame = FALSE; |
| 905 | io->state = OUTSIDE_FRAME; |
| 906 | io->data = io->head; |
| 907 | } |
| 908 | return io->head ? 0 : -ENOMEM; |
| 909 | } |
| 910 | |
Alexander Beregalov | a1de966 | 2009-04-15 12:52:42 +0000 | [diff] [blame] | 911 | static const struct net_device_ops sa1100_irda_netdev_ops = { |
| 912 | .ndo_open = sa1100_irda_start, |
| 913 | .ndo_stop = sa1100_irda_stop, |
| 914 | .ndo_start_xmit = sa1100_irda_hard_xmit, |
| 915 | .ndo_do_ioctl = sa1100_irda_ioctl, |
Alexander Beregalov | a1de966 | 2009-04-15 12:52:42 +0000 | [diff] [blame] | 916 | }; |
| 917 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 918 | static int sa1100_irda_probe(struct platform_device *pdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | struct net_device *dev; |
| 921 | struct sa1100_irda *si; |
| 922 | unsigned int baudrate_mask; |
Russell King | e556fdb | 2012-01-08 12:02:17 +0000 | [diff] [blame] | 923 | int err, irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
| 925 | if (!pdev->dev.platform_data) |
| 926 | return -EINVAL; |
| 927 | |
Russell King | e556fdb | 2012-01-08 12:02:17 +0000 | [diff] [blame] | 928 | irq = platform_get_irq(pdev, 0); |
| 929 | if (irq <= 0) |
| 930 | return irq < 0 ? irq : -ENXIO; |
| 931 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | err = request_mem_region(__PREG(Ser2UTCR0), 0x24, "IrDA") ? 0 : -EBUSY; |
| 933 | if (err) |
| 934 | goto err_mem_1; |
| 935 | err = request_mem_region(__PREG(Ser2HSCR0), 0x1c, "IrDA") ? 0 : -EBUSY; |
| 936 | if (err) |
| 937 | goto err_mem_2; |
| 938 | err = request_mem_region(__PREG(Ser2HSCR2), 0x04, "IrDA") ? 0 : -EBUSY; |
| 939 | if (err) |
| 940 | goto err_mem_3; |
| 941 | |
| 942 | dev = alloc_irdadev(sizeof(struct sa1100_irda)); |
Peter Senna Tschudin | cd9d116 | 2012-10-05 11:33:06 +0000 | [diff] [blame^] | 943 | if (!dev) { |
| 944 | err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | goto err_mem_4; |
Peter Senna Tschudin | cd9d116 | 2012-10-05 11:33:06 +0000 | [diff] [blame^] | 946 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | |
Russell King | d323860 | 2012-01-08 12:07:24 +0000 | [diff] [blame] | 948 | SET_NETDEV_DEV(dev, &pdev->dev); |
| 949 | |
Wang Chen | 4cf1653 | 2008-11-12 23:38:14 -0800 | [diff] [blame] | 950 | si = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | si->dev = &pdev->dev; |
| 952 | si->pdata = pdev->dev.platform_data; |
| 953 | |
Russell King | 32273f5 | 2012-01-12 12:45:00 +0000 | [diff] [blame] | 954 | sg_init_table(&si->dma_rx.sg, 1); |
| 955 | sg_init_table(&si->dma_tx.sg, 1); |
| 956 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | /* |
| 958 | * Initialise the HP-SIR buffers |
| 959 | */ |
| 960 | err = sa1100_irda_init_iobuf(&si->rx_buff, 14384); |
| 961 | if (err) |
| 962 | goto err_mem_5; |
Russell King | 04b7fc4 | 2012-01-12 13:51:10 +0000 | [diff] [blame] | 963 | err = sa1100_irda_init_iobuf(&si->tx_buff, IRDA_SIR_MAX_FRAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | if (err) |
| 965 | goto err_mem_5; |
| 966 | |
Alexander Beregalov | a1de966 | 2009-04-15 12:52:42 +0000 | [diff] [blame] | 967 | dev->netdev_ops = &sa1100_irda_netdev_ops; |
Russell King | e556fdb | 2012-01-08 12:02:17 +0000 | [diff] [blame] | 968 | dev->irq = irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | |
| 970 | irda_init_max_qos_capabilies(&si->qos); |
| 971 | |
| 972 | /* |
| 973 | * We support original IRDA up to 115k2. (we don't currently |
| 974 | * support 4Mbps). Min Turn Time set to 1ms or greater. |
| 975 | */ |
| 976 | baudrate_mask = IR_9600; |
| 977 | |
| 978 | switch (max_rate) { |
| 979 | case 4000000: baudrate_mask |= IR_4000000 << 8; |
| 980 | case 115200: baudrate_mask |= IR_115200; |
| 981 | case 57600: baudrate_mask |= IR_57600; |
| 982 | case 38400: baudrate_mask |= IR_38400; |
| 983 | case 19200: baudrate_mask |= IR_19200; |
| 984 | } |
| 985 | |
| 986 | si->qos.baud_rate.bits &= baudrate_mask; |
| 987 | si->qos.min_turn_time.bits = 7; |
| 988 | |
| 989 | irda_qos_bits_to_value(&si->qos); |
| 990 | |
| 991 | si->utcr4 = UTCR4_HPSIR; |
| 992 | if (tx_lpm) |
| 993 | si->utcr4 |= UTCR4_Z1_6us; |
| 994 | |
| 995 | /* |
| 996 | * Initially enable HP-SIR modulation, and ensure that the port |
| 997 | * is disabled. |
| 998 | */ |
| 999 | Ser2UTCR3 = 0; |
| 1000 | Ser2UTCR4 = si->utcr4; |
| 1001 | Ser2HSCR0 = HSCR0_UART; |
| 1002 | |
| 1003 | err = register_netdev(dev); |
| 1004 | if (err == 0) |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1005 | platform_set_drvdata(pdev, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | |
| 1007 | if (err) { |
| 1008 | err_mem_5: |
| 1009 | kfree(si->tx_buff.head); |
| 1010 | kfree(si->rx_buff.head); |
| 1011 | free_netdev(dev); |
| 1012 | err_mem_4: |
| 1013 | release_mem_region(__PREG(Ser2HSCR2), 0x04); |
| 1014 | err_mem_3: |
| 1015 | release_mem_region(__PREG(Ser2HSCR0), 0x1c); |
| 1016 | err_mem_2: |
| 1017 | release_mem_region(__PREG(Ser2UTCR0), 0x24); |
| 1018 | } |
| 1019 | err_mem_1: |
| 1020 | return err; |
| 1021 | } |
| 1022 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1023 | static int sa1100_irda_remove(struct platform_device *pdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1025 | struct net_device *dev = platform_get_drvdata(pdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | |
| 1027 | if (dev) { |
Wang Chen | 4cf1653 | 2008-11-12 23:38:14 -0800 | [diff] [blame] | 1028 | struct sa1100_irda *si = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | unregister_netdev(dev); |
| 1030 | kfree(si->tx_buff.head); |
| 1031 | kfree(si->rx_buff.head); |
| 1032 | free_netdev(dev); |
| 1033 | } |
| 1034 | |
| 1035 | release_mem_region(__PREG(Ser2HSCR2), 0x04); |
| 1036 | release_mem_region(__PREG(Ser2HSCR0), 0x1c); |
| 1037 | release_mem_region(__PREG(Ser2UTCR0), 0x24); |
| 1038 | |
| 1039 | return 0; |
| 1040 | } |
| 1041 | |
Russell King | cbe1d24 | 2012-01-08 16:40:07 +0000 | [diff] [blame] | 1042 | #ifdef CONFIG_PM |
| 1043 | /* |
| 1044 | * Suspend the IrDA interface. |
| 1045 | */ |
| 1046 | static int sa1100_irda_suspend(struct platform_device *pdev, pm_message_t state) |
| 1047 | { |
| 1048 | struct net_device *dev = platform_get_drvdata(pdev); |
| 1049 | struct sa1100_irda *si; |
| 1050 | |
| 1051 | if (!dev) |
| 1052 | return 0; |
| 1053 | |
| 1054 | si = netdev_priv(dev); |
| 1055 | if (si->open) { |
| 1056 | /* |
| 1057 | * Stop the transmit queue |
| 1058 | */ |
| 1059 | netif_device_detach(dev); |
| 1060 | disable_irq(dev->irq); |
| 1061 | sa1100_irda_shutdown(si); |
| 1062 | __sa1100_irda_set_power(si, 0); |
| 1063 | } |
| 1064 | |
| 1065 | return 0; |
| 1066 | } |
| 1067 | |
| 1068 | /* |
| 1069 | * Resume the IrDA interface. |
| 1070 | */ |
| 1071 | static int sa1100_irda_resume(struct platform_device *pdev) |
| 1072 | { |
| 1073 | struct net_device *dev = platform_get_drvdata(pdev); |
| 1074 | struct sa1100_irda *si; |
| 1075 | |
| 1076 | if (!dev) |
| 1077 | return 0; |
| 1078 | |
| 1079 | si = netdev_priv(dev); |
| 1080 | if (si->open) { |
| 1081 | /* |
| 1082 | * If we missed a speed change, initialise at the new speed |
| 1083 | * directly. It is debatable whether this is actually |
| 1084 | * required, but in the interests of continuing from where |
| 1085 | * we left off it is desirable. The converse argument is |
| 1086 | * that we should re-negotiate at 9600 baud again. |
| 1087 | */ |
| 1088 | if (si->newspeed) { |
| 1089 | si->speed = si->newspeed; |
| 1090 | si->newspeed = 0; |
| 1091 | } |
| 1092 | |
| 1093 | sa1100_irda_startup(si); |
| 1094 | __sa1100_irda_set_power(si, si->power); |
| 1095 | enable_irq(dev->irq); |
| 1096 | |
| 1097 | /* |
| 1098 | * This automatically wakes up the queue |
| 1099 | */ |
| 1100 | netif_device_attach(dev); |
| 1101 | } |
| 1102 | |
| 1103 | return 0; |
| 1104 | } |
| 1105 | #else |
| 1106 | #define sa1100_irda_suspend NULL |
| 1107 | #define sa1100_irda_resume NULL |
| 1108 | #endif |
| 1109 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1110 | static struct platform_driver sa1100ir_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | .probe = sa1100_irda_probe, |
| 1112 | .remove = sa1100_irda_remove, |
| 1113 | .suspend = sa1100_irda_suspend, |
| 1114 | .resume = sa1100_irda_resume, |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1115 | .driver = { |
| 1116 | .name = "sa11x0-ir", |
Kay Sievers | 72abb46 | 2008-04-18 13:50:44 -0700 | [diff] [blame] | 1117 | .owner = THIS_MODULE, |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1118 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | }; |
| 1120 | |
| 1121 | static int __init sa1100_irda_init(void) |
| 1122 | { |
| 1123 | /* |
| 1124 | * Limit power level a sensible range. |
| 1125 | */ |
| 1126 | if (power_level < 1) |
| 1127 | power_level = 1; |
| 1128 | if (power_level > 3) |
| 1129 | power_level = 3; |
| 1130 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1131 | return platform_driver_register(&sa1100ir_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | } |
| 1133 | |
| 1134 | static void __exit sa1100_irda_exit(void) |
| 1135 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 1136 | platform_driver_unregister(&sa1100ir_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | } |
| 1138 | |
| 1139 | module_init(sa1100_irda_init); |
| 1140 | module_exit(sa1100_irda_exit); |
| 1141 | module_param(power_level, int, 0); |
| 1142 | module_param(tx_lpm, int, 0); |
| 1143 | module_param(max_rate, int, 0); |
| 1144 | |
| 1145 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); |
| 1146 | MODULE_DESCRIPTION("StrongARM SA1100 IrDA driver"); |
| 1147 | MODULE_LICENSE("GPL"); |
| 1148 | MODULE_PARM_DESC(power_level, "IrDA power level, 1 (low) to 3 (high)"); |
| 1149 | MODULE_PARM_DESC(tx_lpm, "Enable transmitter low power (1.6us) mode"); |
| 1150 | MODULE_PARM_DESC(max_rate, "Maximum baud rate (4000000, 115200, 57600, 38400, 19200, 9600)"); |
Kay Sievers | 72abb46 | 2008-04-18 13:50:44 -0700 | [diff] [blame] | 1151 | MODULE_ALIAS("platform:sa11x0-ir"); |