Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Freescale STMP37XX/STMP378X Application UART driver |
| 3 | * |
| 4 | * Author: dmitry pervushin <dimka@embeddedalley.com> |
| 5 | * |
| 6 | * Copyright 2008-2010 Freescale Semiconductor, Inc. |
| 7 | * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. |
| 8 | * |
| 9 | * The code contained herein is licensed under the GNU General Public |
| 10 | * License. You may obtain a copy of the GNU General Public License |
| 11 | * Version 2 or later at the following locations: |
| 12 | * |
| 13 | * http://www.opensource.org/licenses/gpl-license.html |
| 14 | * http://www.gnu.org/copyleft/gpl.html |
| 15 | */ |
| 16 | |
| 17 | #include <linux/kernel.h> |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 18 | #include <linux/errno.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/console.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/wait.h> |
| 25 | #include <linux/tty.h> |
| 26 | #include <linux/tty_driver.h> |
| 27 | #include <linux/tty_flip.h> |
| 28 | #include <linux/serial.h> |
| 29 | #include <linux/serial_core.h> |
| 30 | #include <linux/platform_device.h> |
| 31 | #include <linux/device.h> |
| 32 | #include <linux/clk.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/io.h> |
Shawn Guo | 2e174c3 | 2012-05-06 22:54:26 +0800 | [diff] [blame] | 35 | #include <linux/pinctrl/consumer.h> |
Fabio Estevam | 1ea6607 | 2012-06-18 10:06:09 -0300 | [diff] [blame] | 36 | #include <linux/of_device.h> |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 37 | #include <linux/dma-mapping.h> |
| 38 | #include <linux/fsl/mxs-dma.h> |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 39 | |
| 40 | #include <asm/cacheflush.h> |
| 41 | |
| 42 | #define MXS_AUART_PORTS 5 |
| 43 | |
| 44 | #define AUART_CTRL0 0x00000000 |
| 45 | #define AUART_CTRL0_SET 0x00000004 |
| 46 | #define AUART_CTRL0_CLR 0x00000008 |
| 47 | #define AUART_CTRL0_TOG 0x0000000c |
| 48 | #define AUART_CTRL1 0x00000010 |
| 49 | #define AUART_CTRL1_SET 0x00000014 |
| 50 | #define AUART_CTRL1_CLR 0x00000018 |
| 51 | #define AUART_CTRL1_TOG 0x0000001c |
| 52 | #define AUART_CTRL2 0x00000020 |
| 53 | #define AUART_CTRL2_SET 0x00000024 |
| 54 | #define AUART_CTRL2_CLR 0x00000028 |
| 55 | #define AUART_CTRL2_TOG 0x0000002c |
| 56 | #define AUART_LINECTRL 0x00000030 |
| 57 | #define AUART_LINECTRL_SET 0x00000034 |
| 58 | #define AUART_LINECTRL_CLR 0x00000038 |
| 59 | #define AUART_LINECTRL_TOG 0x0000003c |
| 60 | #define AUART_LINECTRL2 0x00000040 |
| 61 | #define AUART_LINECTRL2_SET 0x00000044 |
| 62 | #define AUART_LINECTRL2_CLR 0x00000048 |
| 63 | #define AUART_LINECTRL2_TOG 0x0000004c |
| 64 | #define AUART_INTR 0x00000050 |
| 65 | #define AUART_INTR_SET 0x00000054 |
| 66 | #define AUART_INTR_CLR 0x00000058 |
| 67 | #define AUART_INTR_TOG 0x0000005c |
| 68 | #define AUART_DATA 0x00000060 |
| 69 | #define AUART_STAT 0x00000070 |
| 70 | #define AUART_DEBUG 0x00000080 |
| 71 | #define AUART_VERSION 0x00000090 |
| 72 | #define AUART_AUTOBAUD 0x000000a0 |
| 73 | |
| 74 | #define AUART_CTRL0_SFTRST (1 << 31) |
| 75 | #define AUART_CTRL0_CLKGATE (1 << 30) |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 76 | #define AUART_CTRL0_RXTO_ENABLE (1 << 27) |
| 77 | #define AUART_CTRL0_RXTIMEOUT(v) (((v) & 0x7ff) << 16) |
| 78 | #define AUART_CTRL0_XFER_COUNT(v) ((v) & 0xffff) |
| 79 | |
| 80 | #define AUART_CTRL1_XFER_COUNT(v) ((v) & 0xffff) |
| 81 | |
| 82 | #define AUART_CTRL2_DMAONERR (1 << 26) |
| 83 | #define AUART_CTRL2_TXDMAE (1 << 25) |
| 84 | #define AUART_CTRL2_RXDMAE (1 << 24) |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 85 | |
| 86 | #define AUART_CTRL2_CTSEN (1 << 15) |
Huang Shijie | 0059202 | 2012-08-08 10:37:59 +0800 | [diff] [blame] | 87 | #define AUART_CTRL2_RTSEN (1 << 14) |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 88 | #define AUART_CTRL2_RTS (1 << 11) |
| 89 | #define AUART_CTRL2_RXE (1 << 9) |
| 90 | #define AUART_CTRL2_TXE (1 << 8) |
| 91 | #define AUART_CTRL2_UARTEN (1 << 0) |
| 92 | |
| 93 | #define AUART_LINECTRL_BAUD_DIVINT_SHIFT 16 |
| 94 | #define AUART_LINECTRL_BAUD_DIVINT_MASK 0xffff0000 |
| 95 | #define AUART_LINECTRL_BAUD_DIVINT(v) (((v) & 0xffff) << 16) |
| 96 | #define AUART_LINECTRL_BAUD_DIVFRAC_SHIFT 8 |
| 97 | #define AUART_LINECTRL_BAUD_DIVFRAC_MASK 0x00003f00 |
| 98 | #define AUART_LINECTRL_BAUD_DIVFRAC(v) (((v) & 0x3f) << 8) |
| 99 | #define AUART_LINECTRL_WLEN_MASK 0x00000060 |
| 100 | #define AUART_LINECTRL_WLEN(v) (((v) & 0x3) << 5) |
| 101 | #define AUART_LINECTRL_FEN (1 << 4) |
| 102 | #define AUART_LINECTRL_STP2 (1 << 3) |
| 103 | #define AUART_LINECTRL_EPS (1 << 2) |
| 104 | #define AUART_LINECTRL_PEN (1 << 1) |
| 105 | #define AUART_LINECTRL_BRK (1 << 0) |
| 106 | |
| 107 | #define AUART_INTR_RTIEN (1 << 22) |
| 108 | #define AUART_INTR_TXIEN (1 << 21) |
| 109 | #define AUART_INTR_RXIEN (1 << 20) |
| 110 | #define AUART_INTR_CTSMIEN (1 << 17) |
| 111 | #define AUART_INTR_RTIS (1 << 6) |
| 112 | #define AUART_INTR_TXIS (1 << 5) |
| 113 | #define AUART_INTR_RXIS (1 << 4) |
| 114 | #define AUART_INTR_CTSMIS (1 << 1) |
| 115 | |
| 116 | #define AUART_STAT_BUSY (1 << 29) |
| 117 | #define AUART_STAT_CTS (1 << 28) |
| 118 | #define AUART_STAT_TXFE (1 << 27) |
| 119 | #define AUART_STAT_TXFF (1 << 25) |
| 120 | #define AUART_STAT_RXFE (1 << 24) |
| 121 | #define AUART_STAT_OERR (1 << 19) |
| 122 | #define AUART_STAT_BERR (1 << 18) |
| 123 | #define AUART_STAT_PERR (1 << 17) |
| 124 | #define AUART_STAT_FERR (1 << 16) |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 125 | #define AUART_STAT_RXCOUNT_MASK 0xffff |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 126 | |
| 127 | static struct uart_driver auart_driver; |
| 128 | |
Huang Shijie | f4b1f03b | 2012-11-16 16:03:52 +0800 | [diff] [blame] | 129 | enum mxs_auart_type { |
| 130 | IMX23_AUART, |
| 131 | IMX28_AUART, |
| 132 | }; |
| 133 | |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 134 | struct mxs_auart_port { |
| 135 | struct uart_port port; |
| 136 | |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 137 | #define MXS_AUART_DMA_CONFIG 0x1 |
| 138 | #define MXS_AUART_DMA_ENABLED 0x2 |
| 139 | #define MXS_AUART_DMA_TX_SYNC 2 /* bit 2 */ |
| 140 | #define MXS_AUART_DMA_RX_READY 3 /* bit 3 */ |
| 141 | unsigned long flags; |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 142 | unsigned int ctrl; |
Huang Shijie | f4b1f03b | 2012-11-16 16:03:52 +0800 | [diff] [blame] | 143 | enum mxs_auart_type devtype; |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 144 | |
| 145 | unsigned int irq; |
| 146 | |
| 147 | struct clk *clk; |
| 148 | struct device *dev; |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 149 | |
| 150 | /* for DMA */ |
| 151 | struct mxs_dma_data dma_data; |
| 152 | int dma_channel_rx, dma_channel_tx; |
| 153 | int dma_irq_rx, dma_irq_tx; |
| 154 | int dma_channel; |
| 155 | |
| 156 | struct scatterlist tx_sgl; |
| 157 | struct dma_chan *tx_dma_chan; |
| 158 | void *tx_dma_buf; |
| 159 | |
| 160 | struct scatterlist rx_sgl; |
| 161 | struct dma_chan *rx_dma_chan; |
| 162 | void *rx_dma_buf; |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 163 | }; |
| 164 | |
Huang Shijie | f4b1f03b | 2012-11-16 16:03:52 +0800 | [diff] [blame] | 165 | static struct platform_device_id mxs_auart_devtype[] = { |
| 166 | { .name = "mxs-auart-imx23", .driver_data = IMX23_AUART }, |
| 167 | { .name = "mxs-auart-imx28", .driver_data = IMX28_AUART }, |
| 168 | { /* sentinel */ } |
| 169 | }; |
| 170 | MODULE_DEVICE_TABLE(platform, mxs_auart_devtype); |
| 171 | |
| 172 | static struct of_device_id mxs_auart_dt_ids[] = { |
| 173 | { |
| 174 | .compatible = "fsl,imx28-auart", |
| 175 | .data = &mxs_auart_devtype[IMX28_AUART] |
| 176 | }, { |
| 177 | .compatible = "fsl,imx23-auart", |
| 178 | .data = &mxs_auart_devtype[IMX23_AUART] |
| 179 | }, { /* sentinel */ } |
| 180 | }; |
| 181 | MODULE_DEVICE_TABLE(of, mxs_auart_dt_ids); |
| 182 | |
| 183 | static inline int is_imx28_auart(struct mxs_auart_port *s) |
| 184 | { |
| 185 | return s->devtype == IMX28_AUART; |
| 186 | } |
| 187 | |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 188 | static inline bool auart_dma_enabled(struct mxs_auart_port *s) |
| 189 | { |
| 190 | return s->flags & MXS_AUART_DMA_ENABLED; |
| 191 | } |
| 192 | |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 193 | static void mxs_auart_stop_tx(struct uart_port *u); |
| 194 | |
| 195 | #define to_auart_port(u) container_of(u, struct mxs_auart_port, port) |
| 196 | |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 197 | static void mxs_auart_tx_chars(struct mxs_auart_port *s); |
| 198 | |
| 199 | static void dma_tx_callback(void *param) |
| 200 | { |
| 201 | struct mxs_auart_port *s = param; |
| 202 | struct circ_buf *xmit = &s->port.state->xmit; |
| 203 | |
| 204 | dma_unmap_sg(s->dev, &s->tx_sgl, 1, DMA_TO_DEVICE); |
| 205 | |
| 206 | /* clear the bit used to serialize the DMA tx. */ |
| 207 | clear_bit(MXS_AUART_DMA_TX_SYNC, &s->flags); |
| 208 | smp_mb__after_clear_bit(); |
| 209 | |
| 210 | /* wake up the possible processes. */ |
| 211 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 212 | uart_write_wakeup(&s->port); |
| 213 | |
| 214 | mxs_auart_tx_chars(s); |
| 215 | } |
| 216 | |
| 217 | static int mxs_auart_dma_tx(struct mxs_auart_port *s, int size) |
| 218 | { |
| 219 | struct dma_async_tx_descriptor *desc; |
| 220 | struct scatterlist *sgl = &s->tx_sgl; |
| 221 | struct dma_chan *channel = s->tx_dma_chan; |
| 222 | u32 pio; |
| 223 | |
| 224 | /* [1] : send PIO. Note, the first pio word is CTRL1. */ |
| 225 | pio = AUART_CTRL1_XFER_COUNT(size); |
| 226 | desc = dmaengine_prep_slave_sg(channel, (struct scatterlist *)&pio, |
| 227 | 1, DMA_TRANS_NONE, 0); |
| 228 | if (!desc) { |
| 229 | dev_err(s->dev, "step 1 error\n"); |
| 230 | return -EINVAL; |
| 231 | } |
| 232 | |
| 233 | /* [2] : set DMA buffer. */ |
| 234 | sg_init_one(sgl, s->tx_dma_buf, size); |
| 235 | dma_map_sg(s->dev, sgl, 1, DMA_TO_DEVICE); |
| 236 | desc = dmaengine_prep_slave_sg(channel, sgl, |
| 237 | 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
| 238 | if (!desc) { |
| 239 | dev_err(s->dev, "step 2 error\n"); |
| 240 | return -EINVAL; |
| 241 | } |
| 242 | |
| 243 | /* [3] : submit the DMA */ |
| 244 | desc->callback = dma_tx_callback; |
| 245 | desc->callback_param = s; |
| 246 | dmaengine_submit(desc); |
| 247 | dma_async_issue_pending(channel); |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | static void mxs_auart_tx_chars(struct mxs_auart_port *s) |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 252 | { |
| 253 | struct circ_buf *xmit = &s->port.state->xmit; |
| 254 | |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 255 | if (auart_dma_enabled(s)) { |
fabio.estevam@freescale.com | 87b8bed | 2013-01-07 23:11:06 -0200 | [diff] [blame] | 256 | u32 i = 0; |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 257 | int size; |
| 258 | void *buffer = s->tx_dma_buf; |
| 259 | |
| 260 | if (test_and_set_bit(MXS_AUART_DMA_TX_SYNC, &s->flags)) |
| 261 | return; |
| 262 | |
| 263 | while (!uart_circ_empty(xmit) && !uart_tx_stopped(&s->port)) { |
| 264 | size = min_t(u32, UART_XMIT_SIZE - i, |
| 265 | CIRC_CNT_TO_END(xmit->head, |
| 266 | xmit->tail, |
| 267 | UART_XMIT_SIZE)); |
| 268 | memcpy(buffer + i, xmit->buf + xmit->tail, size); |
| 269 | xmit->tail = (xmit->tail + size) & (UART_XMIT_SIZE - 1); |
| 270 | |
| 271 | i += size; |
| 272 | if (i >= UART_XMIT_SIZE) |
| 273 | break; |
| 274 | } |
| 275 | |
| 276 | if (uart_tx_stopped(&s->port)) |
| 277 | mxs_auart_stop_tx(&s->port); |
| 278 | |
| 279 | if (i) { |
| 280 | mxs_auart_dma_tx(s, i); |
| 281 | } else { |
| 282 | clear_bit(MXS_AUART_DMA_TX_SYNC, &s->flags); |
| 283 | smp_mb__after_clear_bit(); |
| 284 | } |
| 285 | return; |
| 286 | } |
| 287 | |
| 288 | |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 289 | while (!(readl(s->port.membase + AUART_STAT) & |
| 290 | AUART_STAT_TXFF)) { |
| 291 | if (s->port.x_char) { |
| 292 | s->port.icount.tx++; |
| 293 | writel(s->port.x_char, |
| 294 | s->port.membase + AUART_DATA); |
| 295 | s->port.x_char = 0; |
| 296 | continue; |
| 297 | } |
| 298 | if (!uart_circ_empty(xmit) && !uart_tx_stopped(&s->port)) { |
| 299 | s->port.icount.tx++; |
| 300 | writel(xmit->buf[xmit->tail], |
| 301 | s->port.membase + AUART_DATA); |
| 302 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 303 | } else |
| 304 | break; |
| 305 | } |
Uwe Kleine-König | d0758a2 | 2011-11-22 14:22:56 +0100 | [diff] [blame] | 306 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 307 | uart_write_wakeup(&s->port); |
| 308 | |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 309 | if (uart_circ_empty(&(s->port.state->xmit))) |
| 310 | writel(AUART_INTR_TXIEN, |
| 311 | s->port.membase + AUART_INTR_CLR); |
| 312 | else |
| 313 | writel(AUART_INTR_TXIEN, |
| 314 | s->port.membase + AUART_INTR_SET); |
| 315 | |
| 316 | if (uart_tx_stopped(&s->port)) |
| 317 | mxs_auart_stop_tx(&s->port); |
| 318 | } |
| 319 | |
| 320 | static void mxs_auart_rx_char(struct mxs_auart_port *s) |
| 321 | { |
| 322 | int flag; |
| 323 | u32 stat; |
| 324 | u8 c; |
| 325 | |
| 326 | c = readl(s->port.membase + AUART_DATA); |
| 327 | stat = readl(s->port.membase + AUART_STAT); |
| 328 | |
| 329 | flag = TTY_NORMAL; |
| 330 | s->port.icount.rx++; |
| 331 | |
| 332 | if (stat & AUART_STAT_BERR) { |
| 333 | s->port.icount.brk++; |
| 334 | if (uart_handle_break(&s->port)) |
| 335 | goto out; |
| 336 | } else if (stat & AUART_STAT_PERR) { |
| 337 | s->port.icount.parity++; |
| 338 | } else if (stat & AUART_STAT_FERR) { |
| 339 | s->port.icount.frame++; |
| 340 | } |
| 341 | |
| 342 | /* |
| 343 | * Mask off conditions which should be ingored. |
| 344 | */ |
| 345 | stat &= s->port.read_status_mask; |
| 346 | |
| 347 | if (stat & AUART_STAT_BERR) { |
| 348 | flag = TTY_BREAK; |
| 349 | } else if (stat & AUART_STAT_PERR) |
| 350 | flag = TTY_PARITY; |
| 351 | else if (stat & AUART_STAT_FERR) |
| 352 | flag = TTY_FRAME; |
| 353 | |
| 354 | if (stat & AUART_STAT_OERR) |
| 355 | s->port.icount.overrun++; |
| 356 | |
| 357 | if (uart_handle_sysrq_char(&s->port, c)) |
| 358 | goto out; |
| 359 | |
| 360 | uart_insert_char(&s->port, stat, AUART_STAT_OERR, c, flag); |
| 361 | out: |
| 362 | writel(stat, s->port.membase + AUART_STAT); |
| 363 | } |
| 364 | |
| 365 | static void mxs_auart_rx_chars(struct mxs_auart_port *s) |
| 366 | { |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 367 | u32 stat = 0; |
| 368 | |
| 369 | for (;;) { |
| 370 | stat = readl(s->port.membase + AUART_STAT); |
| 371 | if (stat & AUART_STAT_RXFE) |
| 372 | break; |
| 373 | mxs_auart_rx_char(s); |
| 374 | } |
| 375 | |
| 376 | writel(stat, s->port.membase + AUART_STAT); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 377 | tty_flip_buffer_push(&s->port.state->port); |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 378 | } |
| 379 | |
| 380 | static int mxs_auart_request_port(struct uart_port *u) |
| 381 | { |
| 382 | return 0; |
| 383 | } |
| 384 | |
| 385 | static int mxs_auart_verify_port(struct uart_port *u, |
| 386 | struct serial_struct *ser) |
| 387 | { |
| 388 | if (u->type != PORT_UNKNOWN && u->type != PORT_IMX) |
| 389 | return -EINVAL; |
| 390 | return 0; |
| 391 | } |
| 392 | |
| 393 | static void mxs_auart_config_port(struct uart_port *u, int flags) |
| 394 | { |
| 395 | } |
| 396 | |
| 397 | static const char *mxs_auart_type(struct uart_port *u) |
| 398 | { |
| 399 | struct mxs_auart_port *s = to_auart_port(u); |
| 400 | |
| 401 | return dev_name(s->dev); |
| 402 | } |
| 403 | |
| 404 | static void mxs_auart_release_port(struct uart_port *u) |
| 405 | { |
| 406 | } |
| 407 | |
| 408 | static void mxs_auart_set_mctrl(struct uart_port *u, unsigned mctrl) |
| 409 | { |
| 410 | struct mxs_auart_port *s = to_auart_port(u); |
| 411 | |
| 412 | u32 ctrl = readl(u->membase + AUART_CTRL2); |
| 413 | |
Steffen Trumtrar | a683321 | 2012-12-13 14:27:43 +0100 | [diff] [blame] | 414 | ctrl &= ~(AUART_CTRL2_RTSEN | AUART_CTRL2_RTS); |
Huang Shijie | 0059202 | 2012-08-08 10:37:59 +0800 | [diff] [blame] | 415 | if (mctrl & TIOCM_RTS) { |
Huang Shijie | f21ec3d | 2012-08-22 22:13:36 -0400 | [diff] [blame] | 416 | if (tty_port_cts_enabled(&u->state->port)) |
Huang Shijie | 0059202 | 2012-08-08 10:37:59 +0800 | [diff] [blame] | 417 | ctrl |= AUART_CTRL2_RTSEN; |
Steffen Trumtrar | a683321 | 2012-12-13 14:27:43 +0100 | [diff] [blame] | 418 | else |
| 419 | ctrl |= AUART_CTRL2_RTS; |
Huang Shijie | 0059202 | 2012-08-08 10:37:59 +0800 | [diff] [blame] | 420 | } |
| 421 | |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 422 | s->ctrl = mctrl; |
| 423 | writel(ctrl, u->membase + AUART_CTRL2); |
| 424 | } |
| 425 | |
| 426 | static u32 mxs_auart_get_mctrl(struct uart_port *u) |
| 427 | { |
| 428 | struct mxs_auart_port *s = to_auart_port(u); |
| 429 | u32 stat = readl(u->membase + AUART_STAT); |
| 430 | int ctrl2 = readl(u->membase + AUART_CTRL2); |
| 431 | u32 mctrl = s->ctrl; |
| 432 | |
| 433 | mctrl &= ~TIOCM_CTS; |
| 434 | if (stat & AUART_STAT_CTS) |
| 435 | mctrl |= TIOCM_CTS; |
| 436 | |
| 437 | if (ctrl2 & AUART_CTRL2_RTS) |
| 438 | mctrl |= TIOCM_RTS; |
| 439 | |
| 440 | return mctrl; |
| 441 | } |
| 442 | |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 443 | static bool mxs_auart_dma_filter(struct dma_chan *chan, void *param) |
| 444 | { |
| 445 | struct mxs_auart_port *s = param; |
| 446 | |
| 447 | if (!mxs_dma_is_apbx(chan)) |
| 448 | return false; |
| 449 | |
| 450 | if (s->dma_channel == chan->chan_id) { |
| 451 | chan->private = &s->dma_data; |
| 452 | return true; |
| 453 | } |
| 454 | return false; |
| 455 | } |
| 456 | |
| 457 | static int mxs_auart_dma_prep_rx(struct mxs_auart_port *s); |
| 458 | static void dma_rx_callback(void *arg) |
| 459 | { |
| 460 | struct mxs_auart_port *s = (struct mxs_auart_port *) arg; |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 461 | struct tty_port *port = &s->port.state->port; |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 462 | int count; |
| 463 | u32 stat; |
| 464 | |
Huang Shijie | d7ffb93 | 2012-11-22 15:06:30 +0800 | [diff] [blame] | 465 | dma_unmap_sg(s->dev, &s->rx_sgl, 1, DMA_FROM_DEVICE); |
| 466 | |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 467 | stat = readl(s->port.membase + AUART_STAT); |
| 468 | stat &= ~(AUART_STAT_OERR | AUART_STAT_BERR | |
| 469 | AUART_STAT_PERR | AUART_STAT_FERR); |
| 470 | |
| 471 | count = stat & AUART_STAT_RXCOUNT_MASK; |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 472 | tty_insert_flip_string(port, s->rx_dma_buf, count); |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 473 | |
| 474 | writel(stat, s->port.membase + AUART_STAT); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 475 | tty_flip_buffer_push(port); |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 476 | |
| 477 | /* start the next DMA for RX. */ |
| 478 | mxs_auart_dma_prep_rx(s); |
| 479 | } |
| 480 | |
| 481 | static int mxs_auart_dma_prep_rx(struct mxs_auart_port *s) |
| 482 | { |
| 483 | struct dma_async_tx_descriptor *desc; |
| 484 | struct scatterlist *sgl = &s->rx_sgl; |
| 485 | struct dma_chan *channel = s->rx_dma_chan; |
| 486 | u32 pio[1]; |
| 487 | |
| 488 | /* [1] : send PIO */ |
| 489 | pio[0] = AUART_CTRL0_RXTO_ENABLE |
| 490 | | AUART_CTRL0_RXTIMEOUT(0x80) |
| 491 | | AUART_CTRL0_XFER_COUNT(UART_XMIT_SIZE); |
| 492 | desc = dmaengine_prep_slave_sg(channel, (struct scatterlist *)pio, |
| 493 | 1, DMA_TRANS_NONE, 0); |
| 494 | if (!desc) { |
| 495 | dev_err(s->dev, "step 1 error\n"); |
| 496 | return -EINVAL; |
| 497 | } |
| 498 | |
| 499 | /* [2] : send DMA request */ |
| 500 | sg_init_one(sgl, s->rx_dma_buf, UART_XMIT_SIZE); |
| 501 | dma_map_sg(s->dev, sgl, 1, DMA_FROM_DEVICE); |
| 502 | desc = dmaengine_prep_slave_sg(channel, sgl, 1, DMA_DEV_TO_MEM, |
| 503 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
| 504 | if (!desc) { |
| 505 | dev_err(s->dev, "step 2 error\n"); |
| 506 | return -1; |
| 507 | } |
| 508 | |
| 509 | /* [3] : submit the DMA, but do not issue it. */ |
| 510 | desc->callback = dma_rx_callback; |
| 511 | desc->callback_param = s; |
| 512 | dmaengine_submit(desc); |
| 513 | dma_async_issue_pending(channel); |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | static void mxs_auart_dma_exit_channel(struct mxs_auart_port *s) |
| 518 | { |
| 519 | if (s->tx_dma_chan) { |
| 520 | dma_release_channel(s->tx_dma_chan); |
| 521 | s->tx_dma_chan = NULL; |
| 522 | } |
| 523 | if (s->rx_dma_chan) { |
| 524 | dma_release_channel(s->rx_dma_chan); |
| 525 | s->rx_dma_chan = NULL; |
| 526 | } |
| 527 | |
| 528 | kfree(s->tx_dma_buf); |
| 529 | kfree(s->rx_dma_buf); |
| 530 | s->tx_dma_buf = NULL; |
| 531 | s->rx_dma_buf = NULL; |
| 532 | } |
| 533 | |
| 534 | static void mxs_auart_dma_exit(struct mxs_auart_port *s) |
| 535 | { |
| 536 | |
| 537 | writel(AUART_CTRL2_TXDMAE | AUART_CTRL2_RXDMAE | AUART_CTRL2_DMAONERR, |
| 538 | s->port.membase + AUART_CTRL2_CLR); |
| 539 | |
| 540 | mxs_auart_dma_exit_channel(s); |
| 541 | s->flags &= ~MXS_AUART_DMA_ENABLED; |
| 542 | clear_bit(MXS_AUART_DMA_TX_SYNC, &s->flags); |
| 543 | clear_bit(MXS_AUART_DMA_RX_READY, &s->flags); |
| 544 | } |
| 545 | |
| 546 | static int mxs_auart_dma_init(struct mxs_auart_port *s) |
| 547 | { |
| 548 | dma_cap_mask_t mask; |
| 549 | |
| 550 | if (auart_dma_enabled(s)) |
| 551 | return 0; |
| 552 | |
| 553 | /* We do not get the right DMA channels. */ |
Thomas Jarosch | 81a7d77 | 2012-12-29 00:16:33 +0100 | [diff] [blame] | 554 | if (s->dma_channel_rx == -1 || s->dma_channel_tx == -1) |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 555 | return -EINVAL; |
| 556 | |
| 557 | /* init for RX */ |
| 558 | dma_cap_zero(mask); |
| 559 | dma_cap_set(DMA_SLAVE, mask); |
| 560 | s->dma_channel = s->dma_channel_rx; |
| 561 | s->dma_data.chan_irq = s->dma_irq_rx; |
| 562 | s->rx_dma_chan = dma_request_channel(mask, mxs_auart_dma_filter, s); |
| 563 | if (!s->rx_dma_chan) |
| 564 | goto err_out; |
| 565 | s->rx_dma_buf = kzalloc(UART_XMIT_SIZE, GFP_KERNEL | GFP_DMA); |
| 566 | if (!s->rx_dma_buf) |
| 567 | goto err_out; |
| 568 | |
| 569 | /* init for TX */ |
| 570 | s->dma_channel = s->dma_channel_tx; |
| 571 | s->dma_data.chan_irq = s->dma_irq_tx; |
| 572 | s->tx_dma_chan = dma_request_channel(mask, mxs_auart_dma_filter, s); |
| 573 | if (!s->tx_dma_chan) |
| 574 | goto err_out; |
| 575 | s->tx_dma_buf = kzalloc(UART_XMIT_SIZE, GFP_KERNEL | GFP_DMA); |
| 576 | if (!s->tx_dma_buf) |
| 577 | goto err_out; |
| 578 | |
| 579 | /* set the flags */ |
| 580 | s->flags |= MXS_AUART_DMA_ENABLED; |
| 581 | dev_dbg(s->dev, "enabled the DMA support."); |
| 582 | |
| 583 | return 0; |
| 584 | |
| 585 | err_out: |
| 586 | mxs_auart_dma_exit_channel(s); |
| 587 | return -EINVAL; |
| 588 | |
| 589 | } |
| 590 | |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 591 | static void mxs_auart_settermios(struct uart_port *u, |
| 592 | struct ktermios *termios, |
| 593 | struct ktermios *old) |
| 594 | { |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 595 | struct mxs_auart_port *s = to_auart_port(u); |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 596 | u32 bm, ctrl, ctrl2, div; |
| 597 | unsigned int cflag, baud; |
| 598 | |
| 599 | cflag = termios->c_cflag; |
| 600 | |
| 601 | ctrl = AUART_LINECTRL_FEN; |
| 602 | ctrl2 = readl(u->membase + AUART_CTRL2); |
| 603 | |
| 604 | /* byte size */ |
| 605 | switch (cflag & CSIZE) { |
| 606 | case CS5: |
| 607 | bm = 0; |
| 608 | break; |
| 609 | case CS6: |
| 610 | bm = 1; |
| 611 | break; |
| 612 | case CS7: |
| 613 | bm = 2; |
| 614 | break; |
| 615 | case CS8: |
| 616 | bm = 3; |
| 617 | break; |
| 618 | default: |
| 619 | return; |
| 620 | } |
| 621 | |
| 622 | ctrl |= AUART_LINECTRL_WLEN(bm); |
| 623 | |
| 624 | /* parity */ |
| 625 | if (cflag & PARENB) { |
| 626 | ctrl |= AUART_LINECTRL_PEN; |
| 627 | if ((cflag & PARODD) == 0) |
| 628 | ctrl |= AUART_LINECTRL_EPS; |
| 629 | } |
| 630 | |
| 631 | u->read_status_mask = 0; |
| 632 | |
| 633 | if (termios->c_iflag & INPCK) |
| 634 | u->read_status_mask |= AUART_STAT_PERR; |
| 635 | if (termios->c_iflag & (BRKINT | PARMRK)) |
| 636 | u->read_status_mask |= AUART_STAT_BERR; |
| 637 | |
| 638 | /* |
| 639 | * Characters to ignore |
| 640 | */ |
| 641 | u->ignore_status_mask = 0; |
| 642 | if (termios->c_iflag & IGNPAR) |
| 643 | u->ignore_status_mask |= AUART_STAT_PERR; |
| 644 | if (termios->c_iflag & IGNBRK) { |
| 645 | u->ignore_status_mask |= AUART_STAT_BERR; |
| 646 | /* |
| 647 | * If we're ignoring parity and break indicators, |
| 648 | * ignore overruns too (for real raw support). |
| 649 | */ |
| 650 | if (termios->c_iflag & IGNPAR) |
| 651 | u->ignore_status_mask |= AUART_STAT_OERR; |
| 652 | } |
| 653 | |
| 654 | /* |
| 655 | * ignore all characters if CREAD is not set |
| 656 | */ |
| 657 | if (cflag & CREAD) |
| 658 | ctrl2 |= AUART_CTRL2_RXE; |
| 659 | else |
| 660 | ctrl2 &= ~AUART_CTRL2_RXE; |
| 661 | |
| 662 | /* figure out the stop bits requested */ |
| 663 | if (cflag & CSTOPB) |
| 664 | ctrl |= AUART_LINECTRL_STP2; |
| 665 | |
| 666 | /* figure out the hardware flow control settings */ |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 667 | if (cflag & CRTSCTS) { |
| 668 | /* |
| 669 | * The DMA has a bug(see errata:2836) in mx23. |
| 670 | * So we can not implement the DMA for auart in mx23, |
| 671 | * we can only implement the DMA support for auart |
| 672 | * in mx28. |
| 673 | */ |
| 674 | if (is_imx28_auart(s) && (s->flags & MXS_AUART_DMA_CONFIG)) { |
| 675 | if (!mxs_auart_dma_init(s)) |
| 676 | /* enable DMA tranfer */ |
| 677 | ctrl2 |= AUART_CTRL2_TXDMAE | AUART_CTRL2_RXDMAE |
| 678 | | AUART_CTRL2_DMAONERR; |
| 679 | } |
Huang Shijie | 0059202 | 2012-08-08 10:37:59 +0800 | [diff] [blame] | 680 | ctrl2 |= AUART_CTRL2_CTSEN | AUART_CTRL2_RTSEN; |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 681 | } else { |
Huang Shijie | 0059202 | 2012-08-08 10:37:59 +0800 | [diff] [blame] | 682 | ctrl2 &= ~(AUART_CTRL2_CTSEN | AUART_CTRL2_RTSEN); |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 683 | } |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 684 | |
| 685 | /* set baud rate */ |
| 686 | baud = uart_get_baud_rate(u, termios, old, 0, u->uartclk); |
| 687 | div = u->uartclk * 32 / baud; |
| 688 | ctrl |= AUART_LINECTRL_BAUD_DIVFRAC(div & 0x3F); |
| 689 | ctrl |= AUART_LINECTRL_BAUD_DIVINT(div >> 6); |
| 690 | |
| 691 | writel(ctrl, u->membase + AUART_LINECTRL); |
| 692 | writel(ctrl2, u->membase + AUART_CTRL2); |
Lothar Waßmann | 8b979f7 | 2012-05-03 11:37:12 +0200 | [diff] [blame] | 693 | |
| 694 | uart_update_timeout(u, termios->c_cflag, baud); |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 695 | |
| 696 | /* prepare for the DMA RX. */ |
| 697 | if (auart_dma_enabled(s) && |
| 698 | !test_and_set_bit(MXS_AUART_DMA_RX_READY, &s->flags)) { |
| 699 | if (!mxs_auart_dma_prep_rx(s)) { |
| 700 | /* Disable the normal RX interrupt. */ |
Huang Shijie | a591944 | 2012-11-22 15:06:29 +0800 | [diff] [blame] | 701 | writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN, |
| 702 | u->membase + AUART_INTR_CLR); |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 703 | } else { |
| 704 | mxs_auart_dma_exit(s); |
| 705 | dev_err(s->dev, "We can not start up the DMA.\n"); |
| 706 | } |
| 707 | } |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 708 | } |
| 709 | |
| 710 | static irqreturn_t mxs_auart_irq_handle(int irq, void *context) |
| 711 | { |
| 712 | u32 istatus, istat; |
| 713 | struct mxs_auart_port *s = context; |
| 714 | u32 stat = readl(s->port.membase + AUART_STAT); |
| 715 | |
| 716 | istatus = istat = readl(s->port.membase + AUART_INTR); |
| 717 | |
| 718 | if (istat & AUART_INTR_CTSMIS) { |
| 719 | uart_handle_cts_change(&s->port, stat & AUART_STAT_CTS); |
| 720 | writel(AUART_INTR_CTSMIS, |
| 721 | s->port.membase + AUART_INTR_CLR); |
| 722 | istat &= ~AUART_INTR_CTSMIS; |
| 723 | } |
| 724 | |
| 725 | if (istat & (AUART_INTR_RTIS | AUART_INTR_RXIS)) { |
Huang Shijie | a591944 | 2012-11-22 15:06:29 +0800 | [diff] [blame] | 726 | if (!auart_dma_enabled(s)) |
| 727 | mxs_auart_rx_chars(s); |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 728 | istat &= ~(AUART_INTR_RTIS | AUART_INTR_RXIS); |
| 729 | } |
| 730 | |
| 731 | if (istat & AUART_INTR_TXIS) { |
| 732 | mxs_auart_tx_chars(s); |
| 733 | istat &= ~AUART_INTR_TXIS; |
| 734 | } |
| 735 | |
| 736 | writel(istatus & (AUART_INTR_RTIS |
| 737 | | AUART_INTR_TXIS |
| 738 | | AUART_INTR_RXIS |
| 739 | | AUART_INTR_CTSMIS), |
| 740 | s->port.membase + AUART_INTR_CLR); |
| 741 | |
| 742 | return IRQ_HANDLED; |
| 743 | } |
| 744 | |
| 745 | static void mxs_auart_reset(struct uart_port *u) |
| 746 | { |
| 747 | int i; |
| 748 | unsigned int reg; |
| 749 | |
| 750 | writel(AUART_CTRL0_SFTRST, u->membase + AUART_CTRL0_CLR); |
| 751 | |
| 752 | for (i = 0; i < 10000; i++) { |
| 753 | reg = readl(u->membase + AUART_CTRL0); |
| 754 | if (!(reg & AUART_CTRL0_SFTRST)) |
| 755 | break; |
| 756 | udelay(3); |
| 757 | } |
| 758 | writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_CLR); |
| 759 | } |
| 760 | |
| 761 | static int mxs_auart_startup(struct uart_port *u) |
| 762 | { |
| 763 | struct mxs_auart_port *s = to_auart_port(u); |
| 764 | |
Shawn Guo | a481377 | 2011-12-20 14:10:29 +0800 | [diff] [blame] | 765 | clk_prepare_enable(s->clk); |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 766 | |
| 767 | writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_CLR); |
| 768 | |
| 769 | writel(AUART_CTRL2_UARTEN, u->membase + AUART_CTRL2_SET); |
| 770 | |
| 771 | writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN | AUART_INTR_CTSMIEN, |
| 772 | u->membase + AUART_INTR); |
| 773 | |
| 774 | /* |
| 775 | * Enable fifo so all four bytes of a DMA word are written to |
| 776 | * output (otherwise, only the LSB is written, ie. 1 in 4 bytes) |
| 777 | */ |
| 778 | writel(AUART_LINECTRL_FEN, u->membase + AUART_LINECTRL_SET); |
| 779 | |
| 780 | return 0; |
| 781 | } |
| 782 | |
| 783 | static void mxs_auart_shutdown(struct uart_port *u) |
| 784 | { |
| 785 | struct mxs_auart_port *s = to_auart_port(u); |
| 786 | |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 787 | if (auart_dma_enabled(s)) |
| 788 | mxs_auart_dma_exit(s); |
| 789 | |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 790 | writel(AUART_CTRL2_UARTEN, u->membase + AUART_CTRL2_CLR); |
| 791 | |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 792 | writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN | AUART_INTR_CTSMIEN, |
| 793 | u->membase + AUART_INTR_CLR); |
| 794 | |
Huang Shijie | 851b714 | 2012-09-06 22:38:40 -0400 | [diff] [blame] | 795 | writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_SET); |
| 796 | |
Shawn Guo | a481377 | 2011-12-20 14:10:29 +0800 | [diff] [blame] | 797 | clk_disable_unprepare(s->clk); |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 798 | } |
| 799 | |
| 800 | static unsigned int mxs_auart_tx_empty(struct uart_port *u) |
| 801 | { |
| 802 | if (readl(u->membase + AUART_STAT) & AUART_STAT_TXFE) |
| 803 | return TIOCSER_TEMT; |
| 804 | else |
| 805 | return 0; |
| 806 | } |
| 807 | |
| 808 | static void mxs_auart_start_tx(struct uart_port *u) |
| 809 | { |
| 810 | struct mxs_auart_port *s = to_auart_port(u); |
| 811 | |
| 812 | /* enable transmitter */ |
| 813 | writel(AUART_CTRL2_TXE, u->membase + AUART_CTRL2_SET); |
| 814 | |
| 815 | mxs_auart_tx_chars(s); |
| 816 | } |
| 817 | |
| 818 | static void mxs_auart_stop_tx(struct uart_port *u) |
| 819 | { |
| 820 | writel(AUART_CTRL2_TXE, u->membase + AUART_CTRL2_CLR); |
| 821 | } |
| 822 | |
| 823 | static void mxs_auart_stop_rx(struct uart_port *u) |
| 824 | { |
| 825 | writel(AUART_CTRL2_RXE, u->membase + AUART_CTRL2_CLR); |
| 826 | } |
| 827 | |
| 828 | static void mxs_auart_break_ctl(struct uart_port *u, int ctl) |
| 829 | { |
| 830 | if (ctl) |
| 831 | writel(AUART_LINECTRL_BRK, |
| 832 | u->membase + AUART_LINECTRL_SET); |
| 833 | else |
| 834 | writel(AUART_LINECTRL_BRK, |
| 835 | u->membase + AUART_LINECTRL_CLR); |
| 836 | } |
| 837 | |
| 838 | static void mxs_auart_enable_ms(struct uart_port *port) |
| 839 | { |
| 840 | /* just empty */ |
| 841 | } |
| 842 | |
| 843 | static struct uart_ops mxs_auart_ops = { |
| 844 | .tx_empty = mxs_auart_tx_empty, |
| 845 | .start_tx = mxs_auart_start_tx, |
| 846 | .stop_tx = mxs_auart_stop_tx, |
| 847 | .stop_rx = mxs_auart_stop_rx, |
| 848 | .enable_ms = mxs_auart_enable_ms, |
| 849 | .break_ctl = mxs_auart_break_ctl, |
| 850 | .set_mctrl = mxs_auart_set_mctrl, |
| 851 | .get_mctrl = mxs_auart_get_mctrl, |
| 852 | .startup = mxs_auart_startup, |
| 853 | .shutdown = mxs_auart_shutdown, |
| 854 | .set_termios = mxs_auart_settermios, |
| 855 | .type = mxs_auart_type, |
| 856 | .release_port = mxs_auart_release_port, |
| 857 | .request_port = mxs_auart_request_port, |
| 858 | .config_port = mxs_auart_config_port, |
| 859 | .verify_port = mxs_auart_verify_port, |
| 860 | }; |
| 861 | |
| 862 | static struct mxs_auart_port *auart_port[MXS_AUART_PORTS]; |
| 863 | |
| 864 | #ifdef CONFIG_SERIAL_MXS_AUART_CONSOLE |
| 865 | static void mxs_auart_console_putchar(struct uart_port *port, int ch) |
| 866 | { |
| 867 | unsigned int to = 1000; |
| 868 | |
| 869 | while (readl(port->membase + AUART_STAT) & AUART_STAT_TXFF) { |
| 870 | if (!to--) |
| 871 | break; |
| 872 | udelay(1); |
| 873 | } |
| 874 | |
| 875 | writel(ch, port->membase + AUART_DATA); |
| 876 | } |
| 877 | |
| 878 | static void |
| 879 | auart_console_write(struct console *co, const char *str, unsigned int count) |
| 880 | { |
| 881 | struct mxs_auart_port *s; |
| 882 | struct uart_port *port; |
| 883 | unsigned int old_ctrl0, old_ctrl2; |
| 884 | unsigned int to = 1000; |
| 885 | |
Wolfram Sang | 4829e76 | 2013-04-19 21:12:17 +0200 | [diff] [blame] | 886 | if (co->index >= MXS_AUART_PORTS || co->index < 0) |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 887 | return; |
| 888 | |
| 889 | s = auart_port[co->index]; |
| 890 | port = &s->port; |
| 891 | |
| 892 | clk_enable(s->clk); |
| 893 | |
| 894 | /* First save the CR then disable the interrupts */ |
| 895 | old_ctrl2 = readl(port->membase + AUART_CTRL2); |
| 896 | old_ctrl0 = readl(port->membase + AUART_CTRL0); |
| 897 | |
| 898 | writel(AUART_CTRL0_CLKGATE, |
| 899 | port->membase + AUART_CTRL0_CLR); |
| 900 | writel(AUART_CTRL2_UARTEN | AUART_CTRL2_TXE, |
| 901 | port->membase + AUART_CTRL2_SET); |
| 902 | |
| 903 | uart_console_write(port, str, count, mxs_auart_console_putchar); |
| 904 | |
| 905 | /* |
| 906 | * Finally, wait for transmitter to become empty |
| 907 | * and restore the TCR |
| 908 | */ |
| 909 | while (readl(port->membase + AUART_STAT) & AUART_STAT_BUSY) { |
| 910 | if (!to--) |
| 911 | break; |
| 912 | udelay(1); |
| 913 | } |
| 914 | |
| 915 | writel(old_ctrl0, port->membase + AUART_CTRL0); |
| 916 | writel(old_ctrl2, port->membase + AUART_CTRL2); |
| 917 | |
| 918 | clk_disable(s->clk); |
| 919 | } |
| 920 | |
| 921 | static void __init |
| 922 | auart_console_get_options(struct uart_port *port, int *baud, |
| 923 | int *parity, int *bits) |
| 924 | { |
| 925 | unsigned int lcr_h, quot; |
| 926 | |
| 927 | if (!(readl(port->membase + AUART_CTRL2) & AUART_CTRL2_UARTEN)) |
| 928 | return; |
| 929 | |
| 930 | lcr_h = readl(port->membase + AUART_LINECTRL); |
| 931 | |
| 932 | *parity = 'n'; |
| 933 | if (lcr_h & AUART_LINECTRL_PEN) { |
| 934 | if (lcr_h & AUART_LINECTRL_EPS) |
| 935 | *parity = 'e'; |
| 936 | else |
| 937 | *parity = 'o'; |
| 938 | } |
| 939 | |
| 940 | if ((lcr_h & AUART_LINECTRL_WLEN_MASK) == AUART_LINECTRL_WLEN(2)) |
| 941 | *bits = 7; |
| 942 | else |
| 943 | *bits = 8; |
| 944 | |
| 945 | quot = ((readl(port->membase + AUART_LINECTRL) |
| 946 | & AUART_LINECTRL_BAUD_DIVINT_MASK)) |
| 947 | >> (AUART_LINECTRL_BAUD_DIVINT_SHIFT - 6); |
| 948 | quot |= ((readl(port->membase + AUART_LINECTRL) |
| 949 | & AUART_LINECTRL_BAUD_DIVFRAC_MASK)) |
| 950 | >> AUART_LINECTRL_BAUD_DIVFRAC_SHIFT; |
| 951 | if (quot == 0) |
| 952 | quot = 1; |
| 953 | |
| 954 | *baud = (port->uartclk << 2) / quot; |
| 955 | } |
| 956 | |
| 957 | static int __init |
| 958 | auart_console_setup(struct console *co, char *options) |
| 959 | { |
| 960 | struct mxs_auart_port *s; |
| 961 | int baud = 9600; |
| 962 | int bits = 8; |
| 963 | int parity = 'n'; |
| 964 | int flow = 'n'; |
| 965 | int ret; |
| 966 | |
| 967 | /* |
| 968 | * Check whether an invalid uart number has been specified, and |
| 969 | * if so, search for the first available port that does have |
| 970 | * console support. |
| 971 | */ |
| 972 | if (co->index == -1 || co->index >= ARRAY_SIZE(auart_port)) |
| 973 | co->index = 0; |
| 974 | s = auart_port[co->index]; |
| 975 | if (!s) |
| 976 | return -ENODEV; |
| 977 | |
Shawn Guo | a481377 | 2011-12-20 14:10:29 +0800 | [diff] [blame] | 978 | clk_prepare_enable(s->clk); |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 979 | |
| 980 | if (options) |
| 981 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 982 | else |
| 983 | auart_console_get_options(&s->port, &baud, &parity, &bits); |
| 984 | |
| 985 | ret = uart_set_options(&s->port, co, baud, parity, bits, flow); |
| 986 | |
Shawn Guo | a481377 | 2011-12-20 14:10:29 +0800 | [diff] [blame] | 987 | clk_disable_unprepare(s->clk); |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 988 | |
| 989 | return ret; |
| 990 | } |
| 991 | |
| 992 | static struct console auart_console = { |
| 993 | .name = "ttyAPP", |
| 994 | .write = auart_console_write, |
| 995 | .device = uart_console_device, |
| 996 | .setup = auart_console_setup, |
| 997 | .flags = CON_PRINTBUFFER, |
| 998 | .index = -1, |
| 999 | .data = &auart_driver, |
| 1000 | }; |
| 1001 | #endif |
| 1002 | |
| 1003 | static struct uart_driver auart_driver = { |
| 1004 | .owner = THIS_MODULE, |
| 1005 | .driver_name = "ttyAPP", |
| 1006 | .dev_name = "ttyAPP", |
| 1007 | .major = 0, |
| 1008 | .minor = 0, |
| 1009 | .nr = MXS_AUART_PORTS, |
| 1010 | #ifdef CONFIG_SERIAL_MXS_AUART_CONSOLE |
| 1011 | .cons = &auart_console, |
| 1012 | #endif |
| 1013 | }; |
| 1014 | |
Fabio Estevam | 1ea6607 | 2012-06-18 10:06:09 -0300 | [diff] [blame] | 1015 | /* |
| 1016 | * This function returns 1 if pdev isn't a device instatiated by dt, 0 if it |
| 1017 | * could successfully get all information from dt or a negative errno. |
| 1018 | */ |
| 1019 | static int serial_mxs_probe_dt(struct mxs_auart_port *s, |
| 1020 | struct platform_device *pdev) |
| 1021 | { |
| 1022 | struct device_node *np = pdev->dev.of_node; |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 1023 | u32 dma_channel[2]; |
Fabio Estevam | 1ea6607 | 2012-06-18 10:06:09 -0300 | [diff] [blame] | 1024 | int ret; |
| 1025 | |
| 1026 | if (!np) |
| 1027 | /* no device tree device */ |
| 1028 | return 1; |
| 1029 | |
| 1030 | ret = of_alias_get_id(np, "serial"); |
| 1031 | if (ret < 0) { |
| 1032 | dev_err(&pdev->dev, "failed to get alias id: %d\n", ret); |
| 1033 | return ret; |
| 1034 | } |
| 1035 | s->port.line = ret; |
| 1036 | |
Huang Shijie | e800163 | 2012-11-16 16:03:53 +0800 | [diff] [blame] | 1037 | s->dma_irq_rx = platform_get_irq(pdev, 1); |
| 1038 | s->dma_irq_tx = platform_get_irq(pdev, 2); |
| 1039 | |
| 1040 | ret = of_property_read_u32_array(np, "fsl,auart-dma-channel", |
| 1041 | dma_channel, 2); |
| 1042 | if (ret == 0) { |
| 1043 | s->dma_channel_rx = dma_channel[0]; |
| 1044 | s->dma_channel_tx = dma_channel[1]; |
| 1045 | |
| 1046 | s->flags |= MXS_AUART_DMA_CONFIG; |
| 1047 | } else { |
| 1048 | s->dma_channel_rx = -1; |
| 1049 | s->dma_channel_tx = -1; |
| 1050 | } |
Fabio Estevam | 1ea6607 | 2012-06-18 10:06:09 -0300 | [diff] [blame] | 1051 | return 0; |
| 1052 | } |
| 1053 | |
Bill Pemberton | 9671f09 | 2012-11-19 13:21:50 -0500 | [diff] [blame] | 1054 | static int mxs_auart_probe(struct platform_device *pdev) |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1055 | { |
Huang Shijie | f4b1f03b | 2012-11-16 16:03:52 +0800 | [diff] [blame] | 1056 | const struct of_device_id *of_id = |
| 1057 | of_match_device(mxs_auart_dt_ids, &pdev->dev); |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1058 | struct mxs_auart_port *s; |
| 1059 | u32 version; |
| 1060 | int ret = 0; |
| 1061 | struct resource *r; |
Shawn Guo | 2e174c3 | 2012-05-06 22:54:26 +0800 | [diff] [blame] | 1062 | struct pinctrl *pinctrl; |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1063 | |
| 1064 | s = kzalloc(sizeof(struct mxs_auart_port), GFP_KERNEL); |
| 1065 | if (!s) { |
| 1066 | ret = -ENOMEM; |
| 1067 | goto out; |
| 1068 | } |
| 1069 | |
Fabio Estevam | 1ea6607 | 2012-06-18 10:06:09 -0300 | [diff] [blame] | 1070 | ret = serial_mxs_probe_dt(s, pdev); |
| 1071 | if (ret > 0) |
| 1072 | s->port.line = pdev->id < 0 ? 0 : pdev->id; |
| 1073 | else if (ret < 0) |
| 1074 | goto out_free; |
| 1075 | |
Shawn Guo | 2e174c3 | 2012-05-06 22:54:26 +0800 | [diff] [blame] | 1076 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); |
| 1077 | if (IS_ERR(pinctrl)) { |
| 1078 | ret = PTR_ERR(pinctrl); |
| 1079 | goto out_free; |
| 1080 | } |
| 1081 | |
Huang Shijie | f4b1f03b | 2012-11-16 16:03:52 +0800 | [diff] [blame] | 1082 | if (of_id) { |
| 1083 | pdev->id_entry = of_id->data; |
| 1084 | s->devtype = pdev->id_entry->driver_data; |
| 1085 | } |
| 1086 | |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1087 | s->clk = clk_get(&pdev->dev, NULL); |
| 1088 | if (IS_ERR(s->clk)) { |
| 1089 | ret = PTR_ERR(s->clk); |
| 1090 | goto out_free; |
| 1091 | } |
| 1092 | |
| 1093 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1094 | if (!r) { |
| 1095 | ret = -ENXIO; |
| 1096 | goto out_free_clk; |
| 1097 | } |
| 1098 | |
| 1099 | s->port.mapbase = r->start; |
| 1100 | s->port.membase = ioremap(r->start, resource_size(r)); |
| 1101 | s->port.ops = &mxs_auart_ops; |
| 1102 | s->port.iotype = UPIO_MEM; |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1103 | s->port.fifosize = 16; |
| 1104 | s->port.uartclk = clk_get_rate(s->clk); |
| 1105 | s->port.type = PORT_IMX; |
Wolfram Sang | 4c24f2c | 2013-04-19 21:06:20 +0200 | [diff] [blame^] | 1106 | s->port.dev = s->dev = &pdev->dev; |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1107 | |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1108 | s->ctrl = 0; |
| 1109 | |
| 1110 | s->irq = platform_get_irq(pdev, 0); |
| 1111 | s->port.irq = s->irq; |
| 1112 | ret = request_irq(s->irq, mxs_auart_irq_handle, 0, dev_name(&pdev->dev), s); |
| 1113 | if (ret) |
| 1114 | goto out_free_clk; |
| 1115 | |
| 1116 | platform_set_drvdata(pdev, s); |
| 1117 | |
Fabio Estevam | 1ea6607 | 2012-06-18 10:06:09 -0300 | [diff] [blame] | 1118 | auart_port[s->port.line] = s; |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1119 | |
| 1120 | mxs_auart_reset(&s->port); |
| 1121 | |
| 1122 | ret = uart_add_one_port(&auart_driver, &s->port); |
| 1123 | if (ret) |
| 1124 | goto out_free_irq; |
| 1125 | |
| 1126 | version = readl(s->port.membase + AUART_VERSION); |
| 1127 | dev_info(&pdev->dev, "Found APPUART %d.%d.%d\n", |
| 1128 | (version >> 24) & 0xff, |
| 1129 | (version >> 16) & 0xff, version & 0xffff); |
| 1130 | |
| 1131 | return 0; |
| 1132 | |
| 1133 | out_free_irq: |
| 1134 | auart_port[pdev->id] = NULL; |
| 1135 | free_irq(s->irq, s); |
| 1136 | out_free_clk: |
| 1137 | clk_put(s->clk); |
| 1138 | out_free: |
| 1139 | kfree(s); |
| 1140 | out: |
| 1141 | return ret; |
| 1142 | } |
| 1143 | |
Bill Pemberton | ae8d8a1 | 2012-11-19 13:26:18 -0500 | [diff] [blame] | 1144 | static int mxs_auart_remove(struct platform_device *pdev) |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1145 | { |
| 1146 | struct mxs_auart_port *s = platform_get_drvdata(pdev); |
| 1147 | |
| 1148 | uart_remove_one_port(&auart_driver, &s->port); |
| 1149 | |
| 1150 | auart_port[pdev->id] = NULL; |
| 1151 | |
| 1152 | clk_put(s->clk); |
| 1153 | free_irq(s->irq, s); |
| 1154 | kfree(s); |
| 1155 | |
| 1156 | return 0; |
| 1157 | } |
| 1158 | |
| 1159 | static struct platform_driver mxs_auart_driver = { |
| 1160 | .probe = mxs_auart_probe, |
Bill Pemberton | 2d47b71 | 2012-11-19 13:21:34 -0500 | [diff] [blame] | 1161 | .remove = mxs_auart_remove, |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1162 | .driver = { |
| 1163 | .name = "mxs-auart", |
| 1164 | .owner = THIS_MODULE, |
Fabio Estevam | 1ea6607 | 2012-06-18 10:06:09 -0300 | [diff] [blame] | 1165 | .of_match_table = mxs_auart_dt_ids, |
Sascha Hauer | 47d37d6 | 2011-01-11 15:54:54 +0100 | [diff] [blame] | 1166 | }, |
| 1167 | }; |
| 1168 | |
| 1169 | static int __init mxs_auart_init(void) |
| 1170 | { |
| 1171 | int r; |
| 1172 | |
| 1173 | r = uart_register_driver(&auart_driver); |
| 1174 | if (r) |
| 1175 | goto out; |
| 1176 | |
| 1177 | r = platform_driver_register(&mxs_auart_driver); |
| 1178 | if (r) |
| 1179 | goto out_err; |
| 1180 | |
| 1181 | return 0; |
| 1182 | out_err: |
| 1183 | uart_unregister_driver(&auart_driver); |
| 1184 | out: |
| 1185 | return r; |
| 1186 | } |
| 1187 | |
| 1188 | static void __exit mxs_auart_exit(void) |
| 1189 | { |
| 1190 | platform_driver_unregister(&mxs_auart_driver); |
| 1191 | uart_unregister_driver(&auart_driver); |
| 1192 | } |
| 1193 | |
| 1194 | module_init(mxs_auart_init); |
| 1195 | module_exit(mxs_auart_exit); |
| 1196 | MODULE_LICENSE("GPL"); |
| 1197 | MODULE_DESCRIPTION("Freescale MXS application uart driver"); |
Fabio Estevam | 1ea6607 | 2012-06-18 10:06:09 -0300 | [diff] [blame] | 1198 | MODULE_ALIAS("platform:mxs-auart"); |