1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 *Copyright (C) 2011 LAPIS Semiconductor Co., Ltd. 4 */ 5 #include <linux/kernel.h> 6 #include <linux/serial.h> 7 #include <linux/serial_reg.h> 8 #include <linux/slab.h> 9 #include <linux/module.h> 10 #include <linux/pci.h> 11 #include <linux/console.h> 12 #include <linux/serial_core.h> 13 #include <linux/tty.h> 14 #include <linux/tty_flip.h> 15 #include <linux/interrupt.h> 16 #include <linux/io.h> 17 #include <linux/dmi.h> 18 #include <linux/nmi.h> 19 #include <linux/delay.h> 20 #include <linux/of.h> 21 22 #include <linux/debugfs.h> 23 #include <linux/dmaengine.h> 24 #include <linux/pch_dma.h> 25 26 enum { 27 PCH_UART_HANDLED_RX_INT_SHIFT, 28 PCH_UART_HANDLED_TX_INT_SHIFT, 29 PCH_UART_HANDLED_RX_ERR_INT_SHIFT, 30 PCH_UART_HANDLED_RX_TRG_INT_SHIFT, 31 PCH_UART_HANDLED_MS_INT_SHIFT, 32 PCH_UART_HANDLED_LS_INT_SHIFT, 33 }; 34 35 #define PCH_UART_DRIVER_DEVICE "ttyPCH" 36 37 /* Set the max number of UART port 38 * Intel EG20T PCH: 4 port 39 * LAPIS Semiconductor ML7213 IOH: 3 port 40 * LAPIS Semiconductor ML7223 IOH: 2 port 41 */ 42 #define PCH_UART_NR 4 43 44 #define PCH_UART_HANDLED_RX_INT (1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1)) 45 #define PCH_UART_HANDLED_TX_INT (1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1)) 46 #define PCH_UART_HANDLED_RX_ERR_INT (1<<((\ 47 PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1)) 48 #define PCH_UART_HANDLED_RX_TRG_INT (1<<((\ 49 PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1)) 50 #define PCH_UART_HANDLED_MS_INT (1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1)) 51 52 #define PCH_UART_HANDLED_LS_INT (1<<((PCH_UART_HANDLED_LS_INT_SHIFT)<<1)) 53 54 #define PCH_UART_RBR 0x00 55 #define PCH_UART_THR 0x00 56 57 #define PCH_UART_IER_MASK (PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\ 58 PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI) 59 #define PCH_UART_IER_ERBFI 0x00000001 60 #define PCH_UART_IER_ETBEI 0x00000002 61 #define PCH_UART_IER_ELSI 0x00000004 62 #define PCH_UART_IER_EDSSI 0x00000008 63 64 #define PCH_UART_IIR_IP 0x00000001 65 #define PCH_UART_IIR_IID 0x00000006 66 #define PCH_UART_IIR_MSI 0x00000000 67 #define PCH_UART_IIR_TRI 0x00000002 68 #define PCH_UART_IIR_RRI 0x00000004 69 #define PCH_UART_IIR_REI 0x00000006 70 #define PCH_UART_IIR_TOI 0x00000008 71 #define PCH_UART_IIR_FIFO256 0x00000020 72 #define PCH_UART_IIR_FIFO64 PCH_UART_IIR_FIFO256 73 #define PCH_UART_IIR_FE 0x000000C0 74 75 #define PCH_UART_FCR_FIFOE 0x00000001 76 #define PCH_UART_FCR_RFR 0x00000002 77 #define PCH_UART_FCR_TFR 0x00000004 78 #define PCH_UART_FCR_DMS 0x00000008 79 #define PCH_UART_FCR_FIFO256 0x00000020 80 #define PCH_UART_FCR_RFTL 0x000000C0 81 82 #define PCH_UART_FCR_RFTL1 0x00000000 83 #define PCH_UART_FCR_RFTL64 0x00000040 84 #define PCH_UART_FCR_RFTL128 0x00000080 85 #define PCH_UART_FCR_RFTL224 0x000000C0 86 #define PCH_UART_FCR_RFTL16 PCH_UART_FCR_RFTL64 87 #define PCH_UART_FCR_RFTL32 PCH_UART_FCR_RFTL128 88 #define PCH_UART_FCR_RFTL56 PCH_UART_FCR_RFTL224 89 #define PCH_UART_FCR_RFTL4 PCH_UART_FCR_RFTL64 90 #define PCH_UART_FCR_RFTL8 PCH_UART_FCR_RFTL128 91 #define PCH_UART_FCR_RFTL14 PCH_UART_FCR_RFTL224 92 #define PCH_UART_FCR_RFTL_SHIFT 6 93 94 #define PCH_UART_LCR_WLS 0x00000003 95 #define PCH_UART_LCR_STB 0x00000004 96 #define PCH_UART_LCR_PEN 0x00000008 97 #define PCH_UART_LCR_EPS 0x00000010 98 #define PCH_UART_LCR_SP 0x00000020 99 #define PCH_UART_LCR_SB 0x00000040 100 #define PCH_UART_LCR_DLAB 0x00000080 101 #define PCH_UART_LCR_NP 0x00000000 102 #define PCH_UART_LCR_OP PCH_UART_LCR_PEN 103 #define PCH_UART_LCR_EP (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS) 104 #define PCH_UART_LCR_1P (PCH_UART_LCR_PEN | PCH_UART_LCR_SP) 105 #define PCH_UART_LCR_0P (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS |\ 106 PCH_UART_LCR_SP) 107 108 #define PCH_UART_LCR_5BIT 0x00000000 109 #define PCH_UART_LCR_6BIT 0x00000001 110 #define PCH_UART_LCR_7BIT 0x00000002 111 #define PCH_UART_LCR_8BIT 0x00000003 112 113 #define PCH_UART_MCR_DTR 0x00000001 114 #define PCH_UART_MCR_RTS 0x00000002 115 #define PCH_UART_MCR_OUT 0x0000000C 116 #define PCH_UART_MCR_LOOP 0x00000010 117 #define PCH_UART_MCR_AFE 0x00000020 118 119 #define PCH_UART_LSR_DR 0x00000001 120 #define PCH_UART_LSR_ERR (1<<7) 121 122 #define PCH_UART_MSR_DCTS 0x00000001 123 #define PCH_UART_MSR_DDSR 0x00000002 124 #define PCH_UART_MSR_TERI 0x00000004 125 #define PCH_UART_MSR_DDCD 0x00000008 126 #define PCH_UART_MSR_CTS 0x00000010 127 #define PCH_UART_MSR_DSR 0x00000020 128 #define PCH_UART_MSR_RI 0x00000040 129 #define PCH_UART_MSR_DCD 0x00000080 130 #define PCH_UART_MSR_DELTA (PCH_UART_MSR_DCTS | PCH_UART_MSR_DDSR |\ 131 PCH_UART_MSR_TERI | PCH_UART_MSR_DDCD) 132 133 #define PCH_UART_DLL 0x00 134 #define PCH_UART_DLM 0x01 135 136 #define PCH_UART_BRCSR 0x0E 137 138 #define PCH_UART_IID_RLS (PCH_UART_IIR_REI) 139 #define PCH_UART_IID_RDR (PCH_UART_IIR_RRI) 140 #define PCH_UART_IID_RDR_TO (PCH_UART_IIR_RRI | PCH_UART_IIR_TOI) 141 #define PCH_UART_IID_THRE (PCH_UART_IIR_TRI) 142 #define PCH_UART_IID_MS (PCH_UART_IIR_MSI) 143 144 #define PCH_UART_HAL_PARITY_NONE (PCH_UART_LCR_NP) 145 #define PCH_UART_HAL_PARITY_ODD (PCH_UART_LCR_OP) 146 #define PCH_UART_HAL_PARITY_EVEN (PCH_UART_LCR_EP) 147 #define PCH_UART_HAL_PARITY_FIX1 (PCH_UART_LCR_1P) 148 #define PCH_UART_HAL_PARITY_FIX0 (PCH_UART_LCR_0P) 149 #define PCH_UART_HAL_5BIT (PCH_UART_LCR_5BIT) 150 #define PCH_UART_HAL_6BIT (PCH_UART_LCR_6BIT) 151 #define PCH_UART_HAL_7BIT (PCH_UART_LCR_7BIT) 152 #define PCH_UART_HAL_8BIT (PCH_UART_LCR_8BIT) 153 #define PCH_UART_HAL_STB1 0 154 #define PCH_UART_HAL_STB2 (PCH_UART_LCR_STB) 155 156 #define PCH_UART_HAL_CLR_TX_FIFO (PCH_UART_FCR_TFR) 157 #define PCH_UART_HAL_CLR_RX_FIFO (PCH_UART_FCR_RFR) 158 #define PCH_UART_HAL_CLR_ALL_FIFO (PCH_UART_HAL_CLR_TX_FIFO | \ 159 PCH_UART_HAL_CLR_RX_FIFO) 160 161 #define PCH_UART_HAL_DMA_MODE0 0 162 #define PCH_UART_HAL_FIFO_DIS 0 163 #define PCH_UART_HAL_FIFO16 (PCH_UART_FCR_FIFOE) 164 #define PCH_UART_HAL_FIFO256 (PCH_UART_FCR_FIFOE | \ 165 PCH_UART_FCR_FIFO256) 166 #define PCH_UART_HAL_FIFO64 (PCH_UART_HAL_FIFO256) 167 #define PCH_UART_HAL_TRIGGER1 (PCH_UART_FCR_RFTL1) 168 #define PCH_UART_HAL_TRIGGER64 (PCH_UART_FCR_RFTL64) 169 #define PCH_UART_HAL_TRIGGER128 (PCH_UART_FCR_RFTL128) 170 #define PCH_UART_HAL_TRIGGER224 (PCH_UART_FCR_RFTL224) 171 #define PCH_UART_HAL_TRIGGER16 (PCH_UART_FCR_RFTL16) 172 #define PCH_UART_HAL_TRIGGER32 (PCH_UART_FCR_RFTL32) 173 #define PCH_UART_HAL_TRIGGER56 (PCH_UART_FCR_RFTL56) 174 #define PCH_UART_HAL_TRIGGER4 (PCH_UART_FCR_RFTL4) 175 #define PCH_UART_HAL_TRIGGER8 (PCH_UART_FCR_RFTL8) 176 #define PCH_UART_HAL_TRIGGER14 (PCH_UART_FCR_RFTL14) 177 #define PCH_UART_HAL_TRIGGER_L (PCH_UART_FCR_RFTL64) 178 #define PCH_UART_HAL_TRIGGER_M (PCH_UART_FCR_RFTL128) 179 #define PCH_UART_HAL_TRIGGER_H (PCH_UART_FCR_RFTL224) 180 181 #define PCH_UART_HAL_RX_INT (PCH_UART_IER_ERBFI) 182 #define PCH_UART_HAL_TX_INT (PCH_UART_IER_ETBEI) 183 #define PCH_UART_HAL_RX_ERR_INT (PCH_UART_IER_ELSI) 184 #define PCH_UART_HAL_MS_INT (PCH_UART_IER_EDSSI) 185 #define PCH_UART_HAL_ALL_INT (PCH_UART_IER_MASK) 186 187 #define PCH_UART_HAL_DTR (PCH_UART_MCR_DTR) 188 #define PCH_UART_HAL_RTS (PCH_UART_MCR_RTS) 189 #define PCH_UART_HAL_OUT (PCH_UART_MCR_OUT) 190 #define PCH_UART_HAL_LOOP (PCH_UART_MCR_LOOP) 191 #define PCH_UART_HAL_AFE (PCH_UART_MCR_AFE) 192 193 #define DEFAULT_UARTCLK 1843200 /* 1.8432 MHz */ 194 #define CMITC_UARTCLK 192000000 /* 192.0000 MHz */ 195 #define FRI2_64_UARTCLK 64000000 /* 64.0000 MHz */ 196 #define FRI2_48_UARTCLK 48000000 /* 48.0000 MHz */ 197 #define NTC1_UARTCLK 64000000 /* 64.0000 MHz */ 198 #define MINNOW_UARTCLK 50000000 /* 50.0000 MHz */ 199 200 struct pch_uart_buffer { 201 unsigned char *buf; 202 int size; 203 }; 204 205 struct eg20t_port { 206 struct uart_port port; 207 int port_type; 208 void __iomem *membase; 209 resource_size_t mapbase; 210 unsigned int iobase; 211 struct pci_dev *pdev; 212 int fifo_size; 213 unsigned int uartclk; 214 int start_tx; 215 int start_rx; 216 int tx_empty; 217 int trigger; 218 int trigger_level; 219 struct pch_uart_buffer rxbuf; 220 unsigned int dmsr; 221 unsigned int fcr; 222 unsigned int mcr; 223 unsigned int use_dma; 224 struct dma_async_tx_descriptor *desc_tx; 225 struct dma_async_tx_descriptor *desc_rx; 226 struct pch_dma_slave param_tx; 227 struct pch_dma_slave param_rx; 228 struct dma_chan *chan_tx; 229 struct dma_chan *chan_rx; 230 struct scatterlist *sg_tx_p; 231 int nent; 232 int orig_nent; 233 struct scatterlist sg_rx; 234 int tx_dma_use; 235 void *rx_buf_virt; 236 dma_addr_t rx_buf_dma; 237 238 #define IRQ_NAME_SIZE 17 239 char irq_name[IRQ_NAME_SIZE]; 240 241 /* protect the eg20t_port private structure and io access to membase */ 242 spinlock_t lock; 243 }; 244 245 /** 246 * struct pch_uart_driver_data - private data structure for UART-DMA 247 * @port_type: The type of UART port 248 * @line_no: UART port line number (0, 1, 2...) 249 */ 250 struct pch_uart_driver_data { 251 int port_type; 252 int line_no; 253 }; 254 255 enum pch_uart_num_t { 256 pch_et20t_uart0 = 0, 257 pch_et20t_uart1, 258 pch_et20t_uart2, 259 pch_et20t_uart3, 260 pch_ml7213_uart0, 261 pch_ml7213_uart1, 262 pch_ml7213_uart2, 263 pch_ml7223_uart0, 264 pch_ml7223_uart1, 265 pch_ml7831_uart0, 266 pch_ml7831_uart1, 267 }; 268 269 static struct pch_uart_driver_data drv_dat[] = { 270 [pch_et20t_uart0] = {PORT_PCH_8LINE, 0}, 271 [pch_et20t_uart1] = {PORT_PCH_2LINE, 1}, 272 [pch_et20t_uart2] = {PORT_PCH_2LINE, 2}, 273 [pch_et20t_uart3] = {PORT_PCH_2LINE, 3}, 274 [pch_ml7213_uart0] = {PORT_PCH_8LINE, 0}, 275 [pch_ml7213_uart1] = {PORT_PCH_2LINE, 1}, 276 [pch_ml7213_uart2] = {PORT_PCH_2LINE, 2}, 277 [pch_ml7223_uart0] = {PORT_PCH_8LINE, 0}, 278 [pch_ml7223_uart1] = {PORT_PCH_2LINE, 1}, 279 [pch_ml7831_uart0] = {PORT_PCH_8LINE, 0}, 280 [pch_ml7831_uart1] = {PORT_PCH_2LINE, 1}, 281 }; 282 283 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE 284 static struct eg20t_port *pch_uart_ports[PCH_UART_NR]; 285 #endif 286 static unsigned int default_baud = 9600; 287 static unsigned int user_uartclk = 0; 288 static const int trigger_level_256[4] = { 1, 64, 128, 224 }; 289 static const int trigger_level_64[4] = { 1, 16, 32, 56 }; 290 static const int trigger_level_16[4] = { 1, 4, 8, 14 }; 291 static const int trigger_level_1[4] = { 1, 1, 1, 1 }; 292 293 #define PCH_REGS_BUFSIZE 1024 294 295 296 static ssize_t port_show_regs(struct file *file, char __user *user_buf, 297 size_t count, loff_t *ppos) 298 { 299 struct eg20t_port *priv = file->private_data; 300 char *buf; 301 u32 len = 0; 302 ssize_t ret; 303 unsigned char lcr; 304 305 buf = kzalloc(PCH_REGS_BUFSIZE, GFP_KERNEL); 306 if (!buf) 307 return 0; 308 309 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, 310 "PCH EG20T port[%d] regs:\n", priv->port.line); 311 312 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, 313 "=================================\n"); 314 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, 315 "IER: \t0x%02x\n", ioread8(priv->membase + UART_IER)); 316 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, 317 "IIR: \t0x%02x\n", ioread8(priv->membase + UART_IIR)); 318 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, 319 "LCR: \t0x%02x\n", ioread8(priv->membase + UART_LCR)); 320 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, 321 "MCR: \t0x%02x\n", ioread8(priv->membase + UART_MCR)); 322 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, 323 "LSR: \t0x%02x\n", ioread8(priv->membase + UART_LSR)); 324 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, 325 "MSR: \t0x%02x\n", ioread8(priv->membase + UART_MSR)); 326 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, 327 "BRCSR: \t0x%02x\n", 328 ioread8(priv->membase + PCH_UART_BRCSR)); 329 330 lcr = ioread8(priv->membase + UART_LCR); 331 iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR); 332 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, 333 "DLL: \t0x%02x\n", ioread8(priv->membase + UART_DLL)); 334 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len, 335 "DLM: \t0x%02x\n", ioread8(priv->membase + UART_DLM)); 336 iowrite8(lcr, priv->membase + UART_LCR); 337 338 if (len > PCH_REGS_BUFSIZE) 339 len = PCH_REGS_BUFSIZE; 340 341 ret = simple_read_from_buffer(user_buf, count, ppos, buf, len); 342 kfree(buf); 343 return ret; 344 } 345 346 static const struct file_operations port_regs_ops = { 347 .owner = THIS_MODULE, 348 .open = simple_open, 349 .read = port_show_regs, 350 .llseek = default_llseek, 351 }; 352 353 static const struct dmi_system_id pch_uart_dmi_table[] = { 354 { 355 .ident = "CM-iTC", 356 { 357 DMI_MATCH(DMI_BOARD_NAME, "CM-iTC"), 358 }, 359 (void *)CMITC_UARTCLK, 360 }, 361 { 362 .ident = "FRI2", 363 { 364 DMI_MATCH(DMI_BIOS_VERSION, "FRI2"), 365 }, 366 (void *)FRI2_64_UARTCLK, 367 }, 368 { 369 .ident = "Fish River Island II", 370 { 371 DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"), 372 }, 373 (void *)FRI2_48_UARTCLK, 374 }, 375 { 376 .ident = "COMe-mTT", 377 { 378 DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"), 379 }, 380 (void *)NTC1_UARTCLK, 381 }, 382 { 383 .ident = "nanoETXexpress-TT", 384 { 385 DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"), 386 }, 387 (void *)NTC1_UARTCLK, 388 }, 389 { 390 .ident = "MinnowBoard", 391 { 392 DMI_MATCH(DMI_BOARD_NAME, "MinnowBoard"), 393 }, 394 (void *)MINNOW_UARTCLK, 395 }, 396 { } 397 }; 398 399 /* Return UART clock, checking for board specific clocks. */ 400 static unsigned int pch_uart_get_uartclk(void) 401 { 402 const struct dmi_system_id *d; 403 404 if (user_uartclk) 405 return user_uartclk; 406 407 d = dmi_first_match(pch_uart_dmi_table); 408 if (d) 409 return (unsigned long)d->driver_data; 410 411 return DEFAULT_UARTCLK; 412 } 413 414 static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv, 415 unsigned int flag) 416 { 417 u8 ier = ioread8(priv->membase + UART_IER); 418 ier |= flag & PCH_UART_IER_MASK; 419 iowrite8(ier, priv->membase + UART_IER); 420 } 421 422 static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv, 423 unsigned int flag) 424 { 425 u8 ier = ioread8(priv->membase + UART_IER); 426 ier &= ~(flag & PCH_UART_IER_MASK); 427 iowrite8(ier, priv->membase + UART_IER); 428 } 429 430 static int pch_uart_hal_set_line(struct eg20t_port *priv, unsigned int baud, 431 unsigned int parity, unsigned int bits, 432 unsigned int stb) 433 { 434 unsigned int dll, dlm, lcr; 435 int div; 436 437 div = DIV_ROUND_CLOSEST(priv->uartclk / 16, baud); 438 if (div < 0 || USHRT_MAX <= div) { 439 dev_err(priv->port.dev, "Invalid Baud(div=0x%x)\n", div); 440 return -EINVAL; 441 } 442 443 dll = (unsigned int)div & 0x00FFU; 444 dlm = ((unsigned int)div >> 8) & 0x00FFU; 445 446 if (parity & ~(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS | PCH_UART_LCR_SP)) { 447 dev_err(priv->port.dev, "Invalid parity(0x%x)\n", parity); 448 return -EINVAL; 449 } 450 451 if (bits & ~PCH_UART_LCR_WLS) { 452 dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits); 453 return -EINVAL; 454 } 455 456 if (stb & ~PCH_UART_LCR_STB) { 457 dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb); 458 return -EINVAL; 459 } 460 461 lcr = parity; 462 lcr |= bits; 463 lcr |= stb; 464 465 dev_dbg(priv->port.dev, "%s:baud = %u, div = %04x, lcr = %02x (%lu)\n", 466 __func__, baud, div, lcr, jiffies); 467 iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR); 468 iowrite8(dll, priv->membase + PCH_UART_DLL); 469 iowrite8(dlm, priv->membase + PCH_UART_DLM); 470 iowrite8(lcr, priv->membase + UART_LCR); 471 472 return 0; 473 } 474 475 static int pch_uart_hal_fifo_reset(struct eg20t_port *priv, 476 unsigned int flag) 477 { 478 if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) { 479 dev_err(priv->port.dev, "%s:Invalid flag(0x%x)\n", 480 __func__, flag); 481 return -EINVAL; 482 } 483 484 iowrite8(PCH_UART_FCR_FIFOE | priv->fcr, priv->membase + UART_FCR); 485 iowrite8(PCH_UART_FCR_FIFOE | priv->fcr | flag, 486 priv->membase + UART_FCR); 487 iowrite8(priv->fcr, priv->membase + UART_FCR); 488 489 return 0; 490 } 491 492 static int pch_uart_hal_set_fifo(struct eg20t_port *priv, 493 unsigned int dmamode, 494 unsigned int fifo_size, unsigned int trigger) 495 { 496 u8 fcr; 497 498 if (dmamode & ~PCH_UART_FCR_DMS) { 499 dev_err(priv->port.dev, "%s:Invalid DMA Mode(0x%x)\n", 500 __func__, dmamode); 501 return -EINVAL; 502 } 503 504 if (fifo_size & ~(PCH_UART_FCR_FIFOE | PCH_UART_FCR_FIFO256)) { 505 dev_err(priv->port.dev, "%s:Invalid FIFO SIZE(0x%x)\n", 506 __func__, fifo_size); 507 return -EINVAL; 508 } 509 510 if (trigger & ~PCH_UART_FCR_RFTL) { 511 dev_err(priv->port.dev, "%s:Invalid TRIGGER(0x%x)\n", 512 __func__, trigger); 513 return -EINVAL; 514 } 515 516 switch (priv->fifo_size) { 517 case 256: 518 priv->trigger_level = 519 trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT]; 520 break; 521 case 64: 522 priv->trigger_level = 523 trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT]; 524 break; 525 case 16: 526 priv->trigger_level = 527 trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT]; 528 break; 529 default: 530 priv->trigger_level = 531 trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT]; 532 break; 533 } 534 fcr = 535 dmamode | fifo_size | trigger | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR; 536 iowrite8(PCH_UART_FCR_FIFOE, priv->membase + UART_FCR); 537 iowrite8(PCH_UART_FCR_FIFOE | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR, 538 priv->membase + UART_FCR); 539 iowrite8(fcr, priv->membase + UART_FCR); 540 priv->fcr = fcr; 541 542 return 0; 543 } 544 545 static u8 pch_uart_hal_get_modem(struct eg20t_port *priv) 546 { 547 unsigned int msr = ioread8(priv->membase + UART_MSR); 548 priv->dmsr = msr & PCH_UART_MSR_DELTA; 549 return (u8)msr; 550 } 551 552 static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf, 553 int rx_size) 554 { 555 int i; 556 u8 rbr, lsr; 557 struct uart_port *port = &priv->port; 558 559 lsr = ioread8(priv->membase + UART_LSR); 560 for (i = 0, lsr = ioread8(priv->membase + UART_LSR); 561 i < rx_size && lsr & (UART_LSR_DR | UART_LSR_BI); 562 lsr = ioread8(priv->membase + UART_LSR)) { 563 rbr = ioread8(priv->membase + PCH_UART_RBR); 564 565 if (lsr & UART_LSR_BI) { 566 port->icount.brk++; 567 if (uart_handle_break(port)) 568 continue; 569 } 570 if (uart_handle_sysrq_char(port, rbr)) 571 continue; 572 573 buf[i++] = rbr; 574 } 575 return i; 576 } 577 578 static unsigned char pch_uart_hal_get_iid(struct eg20t_port *priv) 579 { 580 return ioread8(priv->membase + UART_IIR) &\ 581 (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP); 582 } 583 584 static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv) 585 { 586 return ioread8(priv->membase + UART_LSR); 587 } 588 589 static void pch_uart_hal_set_break(struct eg20t_port *priv, int on) 590 { 591 unsigned int lcr; 592 593 lcr = ioread8(priv->membase + UART_LCR); 594 if (on) 595 lcr |= PCH_UART_LCR_SB; 596 else 597 lcr &= ~PCH_UART_LCR_SB; 598 599 iowrite8(lcr, priv->membase + UART_LCR); 600 } 601 602 static int push_rx(struct eg20t_port *priv, const unsigned char *buf, 603 int size) 604 { 605 struct uart_port *port = &priv->port; 606 struct tty_port *tport = &port->state->port; 607 608 tty_insert_flip_string(tport, buf, size); 609 tty_flip_buffer_push(tport); 610 611 return 0; 612 } 613 614 static int dma_push_rx(struct eg20t_port *priv, int size) 615 { 616 int room; 617 struct uart_port *port = &priv->port; 618 struct tty_port *tport = &port->state->port; 619 620 room = tty_buffer_request_room(tport, size); 621 622 if (room < size) 623 dev_warn(port->dev, "Rx overrun: dropping %u bytes\n", 624 size - room); 625 if (!room) 626 return 0; 627 628 tty_insert_flip_string(tport, sg_virt(&priv->sg_rx), size); 629 630 port->icount.rx += room; 631 632 return room; 633 } 634 635 static void pch_free_dma(struct uart_port *port) 636 { 637 struct eg20t_port *priv; 638 priv = container_of(port, struct eg20t_port, port); 639 640 if (priv->chan_tx) { 641 dma_release_channel(priv->chan_tx); 642 priv->chan_tx = NULL; 643 } 644 if (priv->chan_rx) { 645 dma_release_channel(priv->chan_rx); 646 priv->chan_rx = NULL; 647 } 648 649 if (priv->rx_buf_dma) { 650 dma_free_coherent(port->dev, port->fifosize, priv->rx_buf_virt, 651 priv->rx_buf_dma); 652 priv->rx_buf_virt = NULL; 653 priv->rx_buf_dma = 0; 654 } 655 656 return; 657 } 658 659 static bool filter(struct dma_chan *chan, void *slave) 660 { 661 struct pch_dma_slave *param = slave; 662 663 if ((chan->chan_id == param->chan_id) && (param->dma_dev == 664 chan->device->dev)) { 665 chan->private = param; 666 return true; 667 } else { 668 return false; 669 } 670 } 671 672 static void pch_request_dma(struct uart_port *port) 673 { 674 dma_cap_mask_t mask; 675 struct dma_chan *chan; 676 struct pci_dev *dma_dev; 677 struct pch_dma_slave *param; 678 struct eg20t_port *priv = 679 container_of(port, struct eg20t_port, port); 680 dma_cap_zero(mask); 681 dma_cap_set(DMA_SLAVE, mask); 682 683 /* Get DMA's dev information */ 684 dma_dev = pci_get_slot(priv->pdev->bus, 685 PCI_DEVFN(PCI_SLOT(priv->pdev->devfn), 0)); 686 687 /* Set Tx DMA */ 688 param = &priv->param_tx; 689 param->dma_dev = &dma_dev->dev; 690 param->chan_id = priv->port.line * 2; /* Tx = 0, 2, 4, ... */ 691 692 param->tx_reg = port->mapbase + UART_TX; 693 chan = dma_request_channel(mask, filter, param); 694 if (!chan) { 695 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n", 696 __func__); 697 pci_dev_put(dma_dev); 698 return; 699 } 700 priv->chan_tx = chan; 701 702 /* Set Rx DMA */ 703 param = &priv->param_rx; 704 param->dma_dev = &dma_dev->dev; 705 param->chan_id = priv->port.line * 2 + 1; /* Rx = Tx + 1 */ 706 707 param->rx_reg = port->mapbase + UART_RX; 708 chan = dma_request_channel(mask, filter, param); 709 if (!chan) { 710 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Rx)\n", 711 __func__); 712 dma_release_channel(priv->chan_tx); 713 priv->chan_tx = NULL; 714 pci_dev_put(dma_dev); 715 return; 716 } 717 718 /* Get Consistent memory for DMA */ 719 priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize, 720 &priv->rx_buf_dma, GFP_KERNEL); 721 priv->chan_rx = chan; 722 723 pci_dev_put(dma_dev); 724 } 725 726 static void pch_dma_rx_complete(void *arg) 727 { 728 struct eg20t_port *priv = arg; 729 struct uart_port *port = &priv->port; 730 int count; 731 732 dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE); 733 count = dma_push_rx(priv, priv->trigger_level); 734 if (count) 735 tty_flip_buffer_push(&port->state->port); 736 async_tx_ack(priv->desc_rx); 737 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT | 738 PCH_UART_HAL_RX_ERR_INT); 739 } 740 741 static void pch_dma_tx_complete(void *arg) 742 { 743 struct eg20t_port *priv = arg; 744 struct uart_port *port = &priv->port; 745 struct scatterlist *sg = priv->sg_tx_p; 746 int i; 747 748 for (i = 0; i < priv->nent; i++, sg++) 749 uart_xmit_advance(port, sg_dma_len(sg)); 750 751 async_tx_ack(priv->desc_tx); 752 dma_unmap_sg(port->dev, priv->sg_tx_p, priv->orig_nent, DMA_TO_DEVICE); 753 priv->tx_dma_use = 0; 754 priv->nent = 0; 755 priv->orig_nent = 0; 756 kfree(priv->sg_tx_p); 757 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT); 758 } 759 760 static int handle_rx_to(struct eg20t_port *priv) 761 { 762 struct pch_uart_buffer *buf; 763 int rx_size; 764 int ret; 765 if (!priv->start_rx) { 766 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT | 767 PCH_UART_HAL_RX_ERR_INT); 768 return 0; 769 } 770 buf = &priv->rxbuf; 771 do { 772 rx_size = pch_uart_hal_read(priv, buf->buf, buf->size); 773 ret = push_rx(priv, buf->buf, rx_size); 774 if (ret) 775 return 0; 776 } while (rx_size == buf->size); 777 778 return PCH_UART_HANDLED_RX_INT; 779 } 780 781 static int handle_rx(struct eg20t_port *priv) 782 { 783 return handle_rx_to(priv); 784 } 785 786 static int dma_handle_rx(struct eg20t_port *priv) 787 { 788 struct uart_port *port = &priv->port; 789 struct dma_async_tx_descriptor *desc; 790 struct scatterlist *sg; 791 792 priv = container_of(port, struct eg20t_port, port); 793 sg = &priv->sg_rx; 794 795 sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */ 796 797 sg_dma_len(sg) = priv->trigger_level; 798 799 sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt), 800 sg_dma_len(sg), offset_in_page(priv->rx_buf_virt)); 801 802 sg_dma_address(sg) = priv->rx_buf_dma; 803 804 desc = dmaengine_prep_slave_sg(priv->chan_rx, 805 sg, 1, DMA_DEV_TO_MEM, 806 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 807 808 if (!desc) 809 return 0; 810 811 priv->desc_rx = desc; 812 desc->callback = pch_dma_rx_complete; 813 desc->callback_param = priv; 814 desc->tx_submit(desc); 815 dma_async_issue_pending(priv->chan_rx); 816 817 return PCH_UART_HANDLED_RX_INT; 818 } 819 820 static unsigned int handle_tx(struct eg20t_port *priv) 821 { 822 struct uart_port *port = &priv->port; 823 struct circ_buf *xmit = &port->state->xmit; 824 int fifo_size; 825 int tx_empty; 826 827 if (!priv->start_tx) { 828 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n", 829 __func__, jiffies); 830 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT); 831 priv->tx_empty = 1; 832 return 0; 833 } 834 835 fifo_size = max(priv->fifo_size, 1); 836 tx_empty = 1; 837 if (port->x_char) { 838 iowrite8(port->x_char, priv->membase + PCH_UART_THR); 839 port->icount.tx++; 840 port->x_char = 0; 841 tx_empty = 0; 842 fifo_size--; 843 } 844 845 while (!uart_tx_stopped(port) && !uart_circ_empty(xmit) && fifo_size) { 846 iowrite8(xmit->buf[xmit->tail], priv->membase + PCH_UART_THR); 847 uart_xmit_advance(port, 1); 848 fifo_size--; 849 tx_empty = 0; 850 } 851 852 priv->tx_empty = tx_empty; 853 854 if (tx_empty) { 855 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT); 856 uart_write_wakeup(port); 857 } 858 859 return PCH_UART_HANDLED_TX_INT; 860 } 861 862 static unsigned int dma_handle_tx(struct eg20t_port *priv) 863 { 864 struct uart_port *port = &priv->port; 865 struct circ_buf *xmit = &port->state->xmit; 866 struct scatterlist *sg; 867 int nent; 868 int fifo_size; 869 struct dma_async_tx_descriptor *desc; 870 int num; 871 int i; 872 int bytes; 873 int size; 874 int rem; 875 876 if (!priv->start_tx) { 877 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n", 878 __func__, jiffies); 879 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT); 880 priv->tx_empty = 1; 881 return 0; 882 } 883 884 if (priv->tx_dma_use) { 885 dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n", 886 __func__, jiffies); 887 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT); 888 priv->tx_empty = 1; 889 return 0; 890 } 891 892 fifo_size = max(priv->fifo_size, 1); 893 894 if (port->x_char) { 895 iowrite8(port->x_char, priv->membase + PCH_UART_THR); 896 port->icount.tx++; 897 port->x_char = 0; 898 fifo_size--; 899 } 900 901 bytes = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); 902 if (!bytes) { 903 dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__); 904 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT); 905 uart_write_wakeup(port); 906 return 0; 907 } 908 909 if (bytes > fifo_size) { 910 num = bytes / fifo_size + 1; 911 size = fifo_size; 912 rem = bytes % fifo_size; 913 } else { 914 num = 1; 915 size = bytes; 916 rem = bytes; 917 } 918 919 dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n", 920 __func__, num, size, rem); 921 922 priv->tx_dma_use = 1; 923 924 priv->sg_tx_p = kmalloc_array(num, sizeof(struct scatterlist), GFP_ATOMIC); 925 if (!priv->sg_tx_p) { 926 dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__); 927 return 0; 928 } 929 930 sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */ 931 sg = priv->sg_tx_p; 932 933 for (i = 0; i < num; i++, sg++) { 934 if (i == (num - 1)) 935 sg_set_page(sg, virt_to_page(xmit->buf), 936 rem, fifo_size * i); 937 else 938 sg_set_page(sg, virt_to_page(xmit->buf), 939 size, fifo_size * i); 940 } 941 942 sg = priv->sg_tx_p; 943 nent = dma_map_sg(port->dev, sg, num, DMA_TO_DEVICE); 944 if (!nent) { 945 dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__); 946 return 0; 947 } 948 priv->orig_nent = num; 949 priv->nent = nent; 950 951 for (i = 0; i < nent; i++, sg++) { 952 sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) + 953 fifo_size * i; 954 sg_dma_address(sg) = (sg_dma_address(sg) & 955 ~(UART_XMIT_SIZE - 1)) + sg->offset; 956 if (i == (nent - 1)) 957 sg_dma_len(sg) = rem; 958 else 959 sg_dma_len(sg) = size; 960 } 961 962 desc = dmaengine_prep_slave_sg(priv->chan_tx, 963 priv->sg_tx_p, nent, DMA_MEM_TO_DEV, 964 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 965 if (!desc) { 966 dev_err(priv->port.dev, "%s:dmaengine_prep_slave_sg Failed\n", 967 __func__); 968 return 0; 969 } 970 dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE); 971 priv->desc_tx = desc; 972 desc->callback = pch_dma_tx_complete; 973 desc->callback_param = priv; 974 975 desc->tx_submit(desc); 976 977 dma_async_issue_pending(priv->chan_tx); 978 979 return PCH_UART_HANDLED_TX_INT; 980 } 981 982 static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr) 983 { 984 struct uart_port *port = &priv->port; 985 struct tty_struct *tty = tty_port_tty_get(&port->state->port); 986 char *error_msg[5] = {}; 987 int i = 0; 988 989 if (lsr & PCH_UART_LSR_ERR) 990 error_msg[i++] = "Error data in FIFO\n"; 991 992 if (lsr & UART_LSR_FE) { 993 port->icount.frame++; 994 error_msg[i++] = " Framing Error\n"; 995 } 996 997 if (lsr & UART_LSR_PE) { 998 port->icount.parity++; 999 error_msg[i++] = " Parity Error\n"; 1000 } 1001 1002 if (lsr & UART_LSR_OE) { 1003 port->icount.overrun++; 1004 error_msg[i++] = " Overrun Error\n"; 1005 } 1006 1007 if (tty == NULL) { 1008 for (i = 0; error_msg[i] != NULL; i++) 1009 dev_err(&priv->pdev->dev, error_msg[i]); 1010 } else { 1011 tty_kref_put(tty); 1012 } 1013 } 1014 1015 static irqreturn_t pch_uart_interrupt(int irq, void *dev_id) 1016 { 1017 struct eg20t_port *priv = dev_id; 1018 unsigned int handled; 1019 u8 lsr; 1020 int ret = 0; 1021 unsigned char iid; 1022 unsigned long flags; 1023 int next = 1; 1024 u8 msr; 1025 1026 spin_lock_irqsave(&priv->lock, flags); 1027 handled = 0; 1028 while (next) { 1029 iid = pch_uart_hal_get_iid(priv); 1030 if (iid & PCH_UART_IIR_IP) /* No Interrupt */ 1031 break; 1032 switch (iid) { 1033 case PCH_UART_IID_RLS: /* Receiver Line Status */ 1034 lsr = pch_uart_hal_get_line_status(priv); 1035 if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE | 1036 UART_LSR_PE | UART_LSR_OE)) { 1037 pch_uart_err_ir(priv, lsr); 1038 ret = PCH_UART_HANDLED_RX_ERR_INT; 1039 } else { 1040 ret = PCH_UART_HANDLED_LS_INT; 1041 } 1042 break; 1043 case PCH_UART_IID_RDR: /* Received Data Ready */ 1044 if (priv->use_dma) { 1045 pch_uart_hal_disable_interrupt(priv, 1046 PCH_UART_HAL_RX_INT | 1047 PCH_UART_HAL_RX_ERR_INT); 1048 ret = dma_handle_rx(priv); 1049 if (!ret) 1050 pch_uart_hal_enable_interrupt(priv, 1051 PCH_UART_HAL_RX_INT | 1052 PCH_UART_HAL_RX_ERR_INT); 1053 } else { 1054 ret = handle_rx(priv); 1055 } 1056 break; 1057 case PCH_UART_IID_RDR_TO: /* Received Data Ready 1058 (FIFO Timeout) */ 1059 ret = handle_rx_to(priv); 1060 break; 1061 case PCH_UART_IID_THRE: /* Transmitter Holding Register 1062 Empty */ 1063 if (priv->use_dma) 1064 ret = dma_handle_tx(priv); 1065 else 1066 ret = handle_tx(priv); 1067 break; 1068 case PCH_UART_IID_MS: /* Modem Status */ 1069 msr = pch_uart_hal_get_modem(priv); 1070 next = 0; /* MS ir prioirty is the lowest. So, MS ir 1071 means final interrupt */ 1072 if ((msr & UART_MSR_ANY_DELTA) == 0) 1073 break; 1074 ret |= PCH_UART_HANDLED_MS_INT; 1075 break; 1076 default: /* Never junp to this label */ 1077 dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__, 1078 iid, jiffies); 1079 ret = -1; 1080 next = 0; 1081 break; 1082 } 1083 handled |= (unsigned int)ret; 1084 } 1085 1086 spin_unlock_irqrestore(&priv->lock, flags); 1087 return IRQ_RETVAL(handled); 1088 } 1089 1090 /* This function tests whether the transmitter fifo and shifter for the port 1091 described by 'port' is empty. */ 1092 static unsigned int pch_uart_tx_empty(struct uart_port *port) 1093 { 1094 struct eg20t_port *priv; 1095 1096 priv = container_of(port, struct eg20t_port, port); 1097 if (priv->tx_empty) 1098 return TIOCSER_TEMT; 1099 else 1100 return 0; 1101 } 1102 1103 /* Returns the current state of modem control inputs. */ 1104 static unsigned int pch_uart_get_mctrl(struct uart_port *port) 1105 { 1106 struct eg20t_port *priv; 1107 u8 modem; 1108 unsigned int ret = 0; 1109 1110 priv = container_of(port, struct eg20t_port, port); 1111 modem = pch_uart_hal_get_modem(priv); 1112 1113 if (modem & UART_MSR_DCD) 1114 ret |= TIOCM_CAR; 1115 1116 if (modem & UART_MSR_RI) 1117 ret |= TIOCM_RNG; 1118 1119 if (modem & UART_MSR_DSR) 1120 ret |= TIOCM_DSR; 1121 1122 if (modem & UART_MSR_CTS) 1123 ret |= TIOCM_CTS; 1124 1125 return ret; 1126 } 1127 1128 static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) 1129 { 1130 u32 mcr = 0; 1131 struct eg20t_port *priv = container_of(port, struct eg20t_port, port); 1132 1133 if (mctrl & TIOCM_DTR) 1134 mcr |= UART_MCR_DTR; 1135 if (mctrl & TIOCM_RTS) 1136 mcr |= UART_MCR_RTS; 1137 if (mctrl & TIOCM_LOOP) 1138 mcr |= UART_MCR_LOOP; 1139 1140 if (priv->mcr & UART_MCR_AFE) 1141 mcr |= UART_MCR_AFE; 1142 1143 if (mctrl) 1144 iowrite8(mcr, priv->membase + UART_MCR); 1145 } 1146 1147 static void pch_uart_stop_tx(struct uart_port *port) 1148 { 1149 struct eg20t_port *priv; 1150 priv = container_of(port, struct eg20t_port, port); 1151 priv->start_tx = 0; 1152 priv->tx_dma_use = 0; 1153 } 1154 1155 static void pch_uart_start_tx(struct uart_port *port) 1156 { 1157 struct eg20t_port *priv; 1158 1159 priv = container_of(port, struct eg20t_port, port); 1160 1161 if (priv->use_dma) { 1162 if (priv->tx_dma_use) { 1163 dev_dbg(priv->port.dev, "%s : Tx DMA is NOT empty.\n", 1164 __func__); 1165 return; 1166 } 1167 } 1168 1169 priv->start_tx = 1; 1170 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT); 1171 } 1172 1173 static void pch_uart_stop_rx(struct uart_port *port) 1174 { 1175 struct eg20t_port *priv; 1176 priv = container_of(port, struct eg20t_port, port); 1177 priv->start_rx = 0; 1178 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT | 1179 PCH_UART_HAL_RX_ERR_INT); 1180 } 1181 1182 /* Enable the modem status interrupts. */ 1183 static void pch_uart_enable_ms(struct uart_port *port) 1184 { 1185 struct eg20t_port *priv; 1186 priv = container_of(port, struct eg20t_port, port); 1187 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT); 1188 } 1189 1190 /* Control the transmission of a break signal. */ 1191 static void pch_uart_break_ctl(struct uart_port *port, int ctl) 1192 { 1193 struct eg20t_port *priv; 1194 unsigned long flags; 1195 1196 priv = container_of(port, struct eg20t_port, port); 1197 spin_lock_irqsave(&priv->lock, flags); 1198 pch_uart_hal_set_break(priv, ctl); 1199 spin_unlock_irqrestore(&priv->lock, flags); 1200 } 1201 1202 /* Grab any interrupt resources and initialise any low level driver state. */ 1203 static int pch_uart_startup(struct uart_port *port) 1204 { 1205 struct eg20t_port *priv; 1206 int ret; 1207 int fifo_size; 1208 int trigger_level; 1209 1210 priv = container_of(port, struct eg20t_port, port); 1211 priv->tx_empty = 1; 1212 1213 if (port->uartclk) 1214 priv->uartclk = port->uartclk; 1215 else 1216 port->uartclk = priv->uartclk; 1217 1218 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT); 1219 ret = pch_uart_hal_set_line(priv, default_baud, 1220 PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT, 1221 PCH_UART_HAL_STB1); 1222 if (ret) 1223 return ret; 1224 1225 switch (priv->fifo_size) { 1226 case 256: 1227 fifo_size = PCH_UART_HAL_FIFO256; 1228 break; 1229 case 64: 1230 fifo_size = PCH_UART_HAL_FIFO64; 1231 break; 1232 case 16: 1233 fifo_size = PCH_UART_HAL_FIFO16; 1234 break; 1235 case 1: 1236 default: 1237 fifo_size = PCH_UART_HAL_FIFO_DIS; 1238 break; 1239 } 1240 1241 switch (priv->trigger) { 1242 case PCH_UART_HAL_TRIGGER1: 1243 trigger_level = 1; 1244 break; 1245 case PCH_UART_HAL_TRIGGER_L: 1246 trigger_level = priv->fifo_size / 4; 1247 break; 1248 case PCH_UART_HAL_TRIGGER_M: 1249 trigger_level = priv->fifo_size / 2; 1250 break; 1251 case PCH_UART_HAL_TRIGGER_H: 1252 default: 1253 trigger_level = priv->fifo_size - (priv->fifo_size / 8); 1254 break; 1255 } 1256 1257 priv->trigger_level = trigger_level; 1258 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0, 1259 fifo_size, priv->trigger); 1260 if (ret < 0) 1261 return ret; 1262 1263 ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED, 1264 priv->irq_name, priv); 1265 if (ret < 0) 1266 return ret; 1267 1268 if (priv->use_dma) 1269 pch_request_dma(port); 1270 1271 priv->start_rx = 1; 1272 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT | 1273 PCH_UART_HAL_RX_ERR_INT); 1274 uart_update_timeout(port, CS8, default_baud); 1275 1276 return 0; 1277 } 1278 1279 static void pch_uart_shutdown(struct uart_port *port) 1280 { 1281 struct eg20t_port *priv; 1282 int ret; 1283 1284 priv = container_of(port, struct eg20t_port, port); 1285 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT); 1286 pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO); 1287 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0, 1288 PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1); 1289 if (ret) 1290 dev_err(priv->port.dev, 1291 "pch_uart_hal_set_fifo Failed(ret=%d)\n", ret); 1292 1293 pch_free_dma(port); 1294 1295 free_irq(priv->port.irq, priv); 1296 } 1297 1298 /* Change the port parameters, including word length, parity, stop 1299 *bits. Update read_status_mask and ignore_status_mask to indicate 1300 *the types of events we are interested in receiving. */ 1301 static void pch_uart_set_termios(struct uart_port *port, 1302 struct ktermios *termios, 1303 const struct ktermios *old) 1304 { 1305 int rtn; 1306 unsigned int baud, parity, bits, stb; 1307 struct eg20t_port *priv; 1308 unsigned long flags; 1309 1310 priv = container_of(port, struct eg20t_port, port); 1311 switch (termios->c_cflag & CSIZE) { 1312 case CS5: 1313 bits = PCH_UART_HAL_5BIT; 1314 break; 1315 case CS6: 1316 bits = PCH_UART_HAL_6BIT; 1317 break; 1318 case CS7: 1319 bits = PCH_UART_HAL_7BIT; 1320 break; 1321 default: /* CS8 */ 1322 bits = PCH_UART_HAL_8BIT; 1323 break; 1324 } 1325 if (termios->c_cflag & CSTOPB) 1326 stb = PCH_UART_HAL_STB2; 1327 else 1328 stb = PCH_UART_HAL_STB1; 1329 1330 if (termios->c_cflag & PARENB) { 1331 if (termios->c_cflag & PARODD) 1332 parity = PCH_UART_HAL_PARITY_ODD; 1333 else 1334 parity = PCH_UART_HAL_PARITY_EVEN; 1335 1336 } else 1337 parity = PCH_UART_HAL_PARITY_NONE; 1338 1339 /* Only UART0 has auto hardware flow function */ 1340 if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256)) 1341 priv->mcr |= UART_MCR_AFE; 1342 else 1343 priv->mcr &= ~UART_MCR_AFE; 1344 1345 termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */ 1346 1347 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); 1348 1349 spin_lock_irqsave(&priv->lock, flags); 1350 uart_port_lock(port); 1351 1352 uart_update_timeout(port, termios->c_cflag, baud); 1353 rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb); 1354 if (rtn) 1355 goto out; 1356 1357 pch_uart_set_mctrl(&priv->port, priv->port.mctrl); 1358 /* Don't rewrite B0 */ 1359 if (tty_termios_baud_rate(termios)) 1360 tty_termios_encode_baud_rate(termios, baud, baud); 1361 1362 out: 1363 uart_port_unlock(port); 1364 spin_unlock_irqrestore(&priv->lock, flags); 1365 } 1366 1367 static const char *pch_uart_type(struct uart_port *port) 1368 { 1369 return KBUILD_MODNAME; 1370 } 1371 1372 static void pch_uart_release_port(struct uart_port *port) 1373 { 1374 struct eg20t_port *priv; 1375 1376 priv = container_of(port, struct eg20t_port, port); 1377 pci_iounmap(priv->pdev, priv->membase); 1378 pci_release_regions(priv->pdev); 1379 } 1380 1381 static int pch_uart_request_port(struct uart_port *port) 1382 { 1383 struct eg20t_port *priv; 1384 int ret; 1385 void __iomem *membase; 1386 1387 priv = container_of(port, struct eg20t_port, port); 1388 ret = pci_request_regions(priv->pdev, KBUILD_MODNAME); 1389 if (ret < 0) 1390 return -EBUSY; 1391 1392 membase = pci_iomap(priv->pdev, 1, 0); 1393 if (!membase) { 1394 pci_release_regions(priv->pdev); 1395 return -EBUSY; 1396 } 1397 priv->membase = port->membase = membase; 1398 1399 return 0; 1400 } 1401 1402 static void pch_uart_config_port(struct uart_port *port, int type) 1403 { 1404 struct eg20t_port *priv; 1405 1406 priv = container_of(port, struct eg20t_port, port); 1407 if (type & UART_CONFIG_TYPE) { 1408 port->type = priv->port_type; 1409 pch_uart_request_port(port); 1410 } 1411 } 1412 1413 static int pch_uart_verify_port(struct uart_port *port, 1414 struct serial_struct *serinfo) 1415 { 1416 struct eg20t_port *priv; 1417 1418 priv = container_of(port, struct eg20t_port, port); 1419 if (serinfo->flags & UPF_LOW_LATENCY) { 1420 dev_info(priv->port.dev, 1421 "PCH UART : Use PIO Mode (without DMA)\n"); 1422 priv->use_dma = 0; 1423 serinfo->flags &= ~UPF_LOW_LATENCY; 1424 } else { 1425 #ifndef CONFIG_PCH_DMA 1426 dev_err(priv->port.dev, "%s : PCH DMA is not Loaded.\n", 1427 __func__); 1428 return -EOPNOTSUPP; 1429 #endif 1430 if (!priv->use_dma) { 1431 pch_request_dma(port); 1432 if (priv->chan_rx) 1433 priv->use_dma = 1; 1434 } 1435 dev_info(priv->port.dev, "PCH UART: %s\n", 1436 priv->use_dma ? 1437 "Use DMA Mode" : "No DMA"); 1438 } 1439 1440 return 0; 1441 } 1442 1443 #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_PCH_UART_CONSOLE) 1444 /* 1445 * Wait for transmitter & holding register to empty 1446 */ 1447 static void wait_for_xmitr(struct eg20t_port *up, int bits) 1448 { 1449 unsigned int status, tmout = 10000; 1450 1451 /* Wait up to 10ms for the character(s) to be sent. */ 1452 for (;;) { 1453 status = ioread8(up->membase + UART_LSR); 1454 1455 if ((status & bits) == bits) 1456 break; 1457 if (--tmout == 0) 1458 break; 1459 udelay(1); 1460 } 1461 1462 /* Wait up to 1s for flow control if necessary */ 1463 if (up->port.flags & UPF_CONS_FLOW) { 1464 unsigned int tmout; 1465 for (tmout = 1000000; tmout; tmout--) { 1466 unsigned int msr = ioread8(up->membase + UART_MSR); 1467 if (msr & UART_MSR_CTS) 1468 break; 1469 udelay(1); 1470 touch_nmi_watchdog(); 1471 } 1472 } 1473 } 1474 #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_PCH_UART_CONSOLE */ 1475 1476 #ifdef CONFIG_CONSOLE_POLL 1477 /* 1478 * Console polling routines for communicate via uart while 1479 * in an interrupt or debug context. 1480 */ 1481 static int pch_uart_get_poll_char(struct uart_port *port) 1482 { 1483 struct eg20t_port *priv = 1484 container_of(port, struct eg20t_port, port); 1485 u8 lsr = ioread8(priv->membase + UART_LSR); 1486 1487 if (!(lsr & UART_LSR_DR)) 1488 return NO_POLL_CHAR; 1489 1490 return ioread8(priv->membase + PCH_UART_RBR); 1491 } 1492 1493 1494 static void pch_uart_put_poll_char(struct uart_port *port, 1495 unsigned char c) 1496 { 1497 unsigned int ier; 1498 struct eg20t_port *priv = 1499 container_of(port, struct eg20t_port, port); 1500 1501 /* 1502 * First save the IER then disable the interrupts 1503 */ 1504 ier = ioread8(priv->membase + UART_IER); 1505 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT); 1506 1507 wait_for_xmitr(priv, UART_LSR_THRE); 1508 /* 1509 * Send the character out. 1510 */ 1511 iowrite8(c, priv->membase + PCH_UART_THR); 1512 1513 /* 1514 * Finally, wait for transmitter to become empty 1515 * and restore the IER 1516 */ 1517 wait_for_xmitr(priv, UART_LSR_BOTH_EMPTY); 1518 iowrite8(ier, priv->membase + UART_IER); 1519 } 1520 #endif /* CONFIG_CONSOLE_POLL */ 1521 1522 static const struct uart_ops pch_uart_ops = { 1523 .tx_empty = pch_uart_tx_empty, 1524 .set_mctrl = pch_uart_set_mctrl, 1525 .get_mctrl = pch_uart_get_mctrl, 1526 .stop_tx = pch_uart_stop_tx, 1527 .start_tx = pch_uart_start_tx, 1528 .stop_rx = pch_uart_stop_rx, 1529 .enable_ms = pch_uart_enable_ms, 1530 .break_ctl = pch_uart_break_ctl, 1531 .startup = pch_uart_startup, 1532 .shutdown = pch_uart_shutdown, 1533 .set_termios = pch_uart_set_termios, 1534 /* .pm = pch_uart_pm, Not supported yet */ 1535 .type = pch_uart_type, 1536 .release_port = pch_uart_release_port, 1537 .request_port = pch_uart_request_port, 1538 .config_port = pch_uart_config_port, 1539 .verify_port = pch_uart_verify_port, 1540 #ifdef CONFIG_CONSOLE_POLL 1541 .poll_get_char = pch_uart_get_poll_char, 1542 .poll_put_char = pch_uart_put_poll_char, 1543 #endif 1544 }; 1545 1546 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE 1547 1548 static void pch_console_putchar(struct uart_port *port, unsigned char ch) 1549 { 1550 struct eg20t_port *priv = 1551 container_of(port, struct eg20t_port, port); 1552 1553 wait_for_xmitr(priv, UART_LSR_THRE); 1554 iowrite8(ch, priv->membase + PCH_UART_THR); 1555 } 1556 1557 /* 1558 * Print a string to the serial port trying not to disturb 1559 * any possible real use of the port... 1560 * 1561 * The console_lock must be held when we get here. 1562 */ 1563 static void 1564 pch_console_write(struct console *co, const char *s, unsigned int count) 1565 { 1566 struct eg20t_port *priv; 1567 unsigned long flags; 1568 int priv_locked = 1; 1569 int port_locked = 1; 1570 u8 ier; 1571 1572 priv = pch_uart_ports[co->index]; 1573 1574 touch_nmi_watchdog(); 1575 1576 local_irq_save(flags); 1577 if (priv->port.sysrq) { 1578 /* call to uart_handle_sysrq_char already took the priv lock */ 1579 priv_locked = 0; 1580 /* serial8250_handle_port() already took the port lock */ 1581 port_locked = 0; 1582 } else if (oops_in_progress) { 1583 priv_locked = spin_trylock(&priv->lock); 1584 port_locked = uart_port_trylock(&priv->port); 1585 } else { 1586 spin_lock(&priv->lock); 1587 uart_port_lock(&priv->port); 1588 } 1589 1590 /* 1591 * First save the IER then disable the interrupts 1592 */ 1593 ier = ioread8(priv->membase + UART_IER); 1594 1595 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT); 1596 1597 uart_console_write(&priv->port, s, count, pch_console_putchar); 1598 1599 /* 1600 * Finally, wait for transmitter to become empty 1601 * and restore the IER 1602 */ 1603 wait_for_xmitr(priv, UART_LSR_BOTH_EMPTY); 1604 iowrite8(ier, priv->membase + UART_IER); 1605 1606 if (port_locked) 1607 uart_port_unlock(&priv->port); 1608 if (priv_locked) 1609 spin_unlock(&priv->lock); 1610 local_irq_restore(flags); 1611 } 1612 1613 static int __init pch_console_setup(struct console *co, char *options) 1614 { 1615 struct uart_port *port; 1616 int baud = default_baud; 1617 int bits = 8; 1618 int parity = 'n'; 1619 int flow = 'n'; 1620 1621 /* 1622 * Check whether an invalid uart number has been specified, and 1623 * if so, search for the first available port that does have 1624 * console support. 1625 */ 1626 if (co->index >= PCH_UART_NR) 1627 co->index = 0; 1628 port = &pch_uart_ports[co->index]->port; 1629 1630 if (!port || (!port->iobase && !port->membase)) 1631 return -ENODEV; 1632 1633 port->uartclk = pch_uart_get_uartclk(); 1634 1635 if (options) 1636 uart_parse_options(options, &baud, &parity, &bits, &flow); 1637 1638 return uart_set_options(port, co, baud, parity, bits, flow); 1639 } 1640 1641 static struct uart_driver pch_uart_driver; 1642 1643 static struct console pch_console = { 1644 .name = PCH_UART_DRIVER_DEVICE, 1645 .write = pch_console_write, 1646 .device = uart_console_device, 1647 .setup = pch_console_setup, 1648 .flags = CON_PRINTBUFFER | CON_ANYTIME, 1649 .index = -1, 1650 .data = &pch_uart_driver, 1651 }; 1652 1653 #define PCH_CONSOLE (&pch_console) 1654 #else 1655 #define PCH_CONSOLE NULL 1656 #endif /* CONFIG_SERIAL_PCH_UART_CONSOLE */ 1657 1658 static struct uart_driver pch_uart_driver = { 1659 .owner = THIS_MODULE, 1660 .driver_name = KBUILD_MODNAME, 1661 .dev_name = PCH_UART_DRIVER_DEVICE, 1662 .major = 0, 1663 .minor = 0, 1664 .nr = PCH_UART_NR, 1665 .cons = PCH_CONSOLE, 1666 }; 1667 1668 static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev, 1669 const struct pci_device_id *id) 1670 { 1671 struct eg20t_port *priv; 1672 int ret; 1673 unsigned int iobase; 1674 unsigned int mapbase; 1675 unsigned char *rxbuf; 1676 int fifosize; 1677 int port_type; 1678 struct pch_uart_driver_data *board; 1679 char name[32]; 1680 1681 board = &drv_dat[id->driver_data]; 1682 port_type = board->port_type; 1683 1684 priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL); 1685 if (priv == NULL) 1686 goto init_port_alloc_err; 1687 1688 rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL); 1689 if (!rxbuf) 1690 goto init_port_free_txbuf; 1691 1692 switch (port_type) { 1693 case PORT_PCH_8LINE: 1694 fifosize = 256; /* EG20T/ML7213: UART0 */ 1695 break; 1696 case PORT_PCH_2LINE: 1697 fifosize = 64; /* EG20T:UART1~3 ML7213: UART1~2*/ 1698 break; 1699 default: 1700 dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type); 1701 goto init_port_hal_free; 1702 } 1703 1704 pci_enable_msi(pdev); 1705 pci_set_master(pdev); 1706 1707 spin_lock_init(&priv->lock); 1708 1709 iobase = pci_resource_start(pdev, 0); 1710 mapbase = pci_resource_start(pdev, 1); 1711 priv->mapbase = mapbase; 1712 priv->iobase = iobase; 1713 priv->pdev = pdev; 1714 priv->tx_empty = 1; 1715 priv->rxbuf.buf = rxbuf; 1716 priv->rxbuf.size = PAGE_SIZE; 1717 1718 priv->fifo_size = fifosize; 1719 priv->uartclk = pch_uart_get_uartclk(); 1720 priv->port_type = port_type; 1721 priv->port.dev = &pdev->dev; 1722 priv->port.iobase = iobase; 1723 priv->port.membase = NULL; 1724 priv->port.mapbase = mapbase; 1725 priv->port.irq = pdev->irq; 1726 priv->port.iotype = UPIO_PORT; 1727 priv->port.ops = &pch_uart_ops; 1728 priv->port.flags = UPF_BOOT_AUTOCONF; 1729 priv->port.fifosize = fifosize; 1730 priv->port.line = board->line_no; 1731 priv->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PCH_UART_CONSOLE); 1732 priv->trigger = PCH_UART_HAL_TRIGGER_M; 1733 1734 snprintf(priv->irq_name, IRQ_NAME_SIZE, 1735 KBUILD_MODNAME ":" PCH_UART_DRIVER_DEVICE "%d", 1736 priv->port.line); 1737 1738 spin_lock_init(&priv->port.lock); 1739 1740 pci_set_drvdata(pdev, priv); 1741 priv->trigger_level = 1; 1742 priv->fcr = 0; 1743 1744 if (pdev->dev.of_node) 1745 of_property_read_u32(pdev->dev.of_node, "clock-frequency" 1746 , &user_uartclk); 1747 1748 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE 1749 pch_uart_ports[board->line_no] = priv; 1750 #endif 1751 ret = uart_add_one_port(&pch_uart_driver, &priv->port); 1752 if (ret < 0) 1753 goto init_port_hal_free; 1754 1755 snprintf(name, sizeof(name), "uart%d_regs", priv->port.line); 1756 debugfs_create_file(name, S_IFREG | S_IRUGO, NULL, priv, 1757 &port_regs_ops); 1758 1759 return priv; 1760 1761 init_port_hal_free: 1762 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE 1763 pch_uart_ports[board->line_no] = NULL; 1764 #endif 1765 free_page((unsigned long)rxbuf); 1766 init_port_free_txbuf: 1767 kfree(priv); 1768 init_port_alloc_err: 1769 1770 return NULL; 1771 } 1772 1773 static void pch_uart_exit_port(struct eg20t_port *priv) 1774 { 1775 char name[32]; 1776 1777 snprintf(name, sizeof(name), "uart%d_regs", priv->port.line); 1778 debugfs_lookup_and_remove(name, NULL); 1779 uart_remove_one_port(&pch_uart_driver, &priv->port); 1780 free_page((unsigned long)priv->rxbuf.buf); 1781 } 1782 1783 static void pch_uart_pci_remove(struct pci_dev *pdev) 1784 { 1785 struct eg20t_port *priv = pci_get_drvdata(pdev); 1786 1787 pci_disable_msi(pdev); 1788 1789 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE 1790 pch_uart_ports[priv->port.line] = NULL; 1791 #endif 1792 pch_uart_exit_port(priv); 1793 pci_disable_device(pdev); 1794 kfree(priv); 1795 return; 1796 } 1797 1798 static int __maybe_unused pch_uart_pci_suspend(struct device *dev) 1799 { 1800 struct eg20t_port *priv = dev_get_drvdata(dev); 1801 1802 uart_suspend_port(&pch_uart_driver, &priv->port); 1803 1804 return 0; 1805 } 1806 1807 static int __maybe_unused pch_uart_pci_resume(struct device *dev) 1808 { 1809 struct eg20t_port *priv = dev_get_drvdata(dev); 1810 1811 uart_resume_port(&pch_uart_driver, &priv->port); 1812 1813 return 0; 1814 } 1815 1816 static const struct pci_device_id pch_uart_pci_id[] = { 1817 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811), 1818 .driver_data = pch_et20t_uart0}, 1819 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812), 1820 .driver_data = pch_et20t_uart1}, 1821 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813), 1822 .driver_data = pch_et20t_uart2}, 1823 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814), 1824 .driver_data = pch_et20t_uart3}, 1825 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027), 1826 .driver_data = pch_ml7213_uart0}, 1827 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028), 1828 .driver_data = pch_ml7213_uart1}, 1829 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029), 1830 .driver_data = pch_ml7213_uart2}, 1831 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C), 1832 .driver_data = pch_ml7223_uart0}, 1833 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D), 1834 .driver_data = pch_ml7223_uart1}, 1835 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8811), 1836 .driver_data = pch_ml7831_uart0}, 1837 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8812), 1838 .driver_data = pch_ml7831_uart1}, 1839 {0,}, 1840 }; 1841 1842 static int pch_uart_pci_probe(struct pci_dev *pdev, 1843 const struct pci_device_id *id) 1844 { 1845 int ret; 1846 struct eg20t_port *priv; 1847 1848 ret = pci_enable_device(pdev); 1849 if (ret < 0) 1850 goto probe_error; 1851 1852 priv = pch_uart_init_port(pdev, id); 1853 if (!priv) { 1854 ret = -EBUSY; 1855 goto probe_disable_device; 1856 } 1857 pci_set_drvdata(pdev, priv); 1858 1859 return ret; 1860 1861 probe_disable_device: 1862 pci_disable_msi(pdev); 1863 pci_disable_device(pdev); 1864 probe_error: 1865 return ret; 1866 } 1867 1868 static SIMPLE_DEV_PM_OPS(pch_uart_pci_pm_ops, 1869 pch_uart_pci_suspend, 1870 pch_uart_pci_resume); 1871 1872 static struct pci_driver pch_uart_pci_driver = { 1873 .name = "pch_uart", 1874 .id_table = pch_uart_pci_id, 1875 .probe = pch_uart_pci_probe, 1876 .remove = pch_uart_pci_remove, 1877 .driver.pm = &pch_uart_pci_pm_ops, 1878 }; 1879 1880 static int __init pch_uart_module_init(void) 1881 { 1882 int ret; 1883 1884 /* register as UART driver */ 1885 ret = uart_register_driver(&pch_uart_driver); 1886 if (ret < 0) 1887 return ret; 1888 1889 /* register as PCI driver */ 1890 ret = pci_register_driver(&pch_uart_pci_driver); 1891 if (ret < 0) 1892 uart_unregister_driver(&pch_uart_driver); 1893 1894 return ret; 1895 } 1896 module_init(pch_uart_module_init); 1897 1898 static void __exit pch_uart_module_exit(void) 1899 { 1900 pci_unregister_driver(&pch_uart_pci_driver); 1901 uart_unregister_driver(&pch_uart_driver); 1902 } 1903 module_exit(pch_uart_module_exit); 1904 1905 MODULE_LICENSE("GPL v2"); 1906 MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver"); 1907 MODULE_DEVICE_TABLE(pci, pch_uart_pci_id); 1908 1909 module_param(default_baud, uint, S_IRUGO); 1910 MODULE_PARM_DESC(default_baud, 1911 "Default BAUD for initial driver state and console (default 9600)"); 1912 module_param(user_uartclk, uint, S_IRUGO); 1913 MODULE_PARM_DESC(user_uartclk, 1914 "Override UART default or board specific UART clock"); 1915