Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2005 Silicon Graphics, Inc. All Rights Reserved. |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * This file contains a module version of the ioc3 serial driver. This |
| 11 | * includes all the support functions needed (support functions, etc.) |
| 12 | * and the serial driver itself. |
| 13 | */ |
| 14 | #include <linux/errno.h> |
| 15 | #include <linux/tty.h> |
| 16 | #include <linux/serial.h> |
| 17 | #include <linux/circ_buf.h> |
| 18 | #include <linux/serial_reg.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/pci.h> |
| 21 | #include <linux/serial_core.h> |
| 22 | #include <linux/ioc3.h> |
| 23 | |
| 24 | /* |
| 25 | * Interesting things about the ioc3 |
| 26 | */ |
| 27 | |
| 28 | #define LOGICAL_PORTS 2 /* rs232(0) and rs422(1) */ |
| 29 | #define PORTS_PER_CARD 2 |
| 30 | #define LOGICAL_PORTS_PER_CARD (PORTS_PER_CARD * LOGICAL_PORTS) |
| 31 | #define MAX_CARDS 8 |
| 32 | #define MAX_LOGICAL_PORTS (LOGICAL_PORTS_PER_CARD * MAX_CARDS) |
| 33 | |
| 34 | /* determine given the sio_ir what port it applies to */ |
| 35 | #define GET_PORT_FROM_SIO_IR(_x) (_x & SIO_IR_SA) ? 0 : 1 |
| 36 | |
| 37 | |
| 38 | /* |
| 39 | * we have 2 logical ports (rs232, rs422) for each physical port |
| 40 | * evens are rs232, odds are rs422 |
| 41 | */ |
| 42 | #define GET_PHYSICAL_PORT(_x) ((_x) >> 1) |
| 43 | #define GET_LOGICAL_PORT(_x) ((_x) & 1) |
| 44 | #define IS_PHYSICAL_PORT(_x) !((_x) & 1) |
| 45 | #define IS_RS232(_x) !((_x) & 1) |
| 46 | |
| 47 | static unsigned int Num_of_ioc3_cards; |
| 48 | static unsigned int Submodule_slot; |
| 49 | |
| 50 | /* defining this will get you LOTS of great debug info */ |
| 51 | //#define DEBUG_INTERRUPTS |
| 52 | #define DPRINT_CONFIG(_x...) ; |
| 53 | //#define DPRINT_CONFIG(_x...) printk _x |
| 54 | #define NOT_PROGRESS() ; |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 55 | //#define NOT_PROGRESS() printk("%s : fails %d\n", __func__, __LINE__) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 56 | |
| 57 | /* number of characters we want to transmit to the lower level at a time */ |
| 58 | #define MAX_CHARS 256 |
| 59 | #define FIFO_SIZE (MAX_CHARS-1) /* it's a uchar */ |
| 60 | |
| 61 | /* Device name we're using */ |
| 62 | #define DEVICE_NAME "ttySIOC" |
| 63 | #define DEVICE_MAJOR 204 |
| 64 | #define DEVICE_MINOR 116 |
| 65 | |
| 66 | /* flags for next_char_state */ |
| 67 | #define NCS_BREAK 0x1 |
| 68 | #define NCS_PARITY 0x2 |
| 69 | #define NCS_FRAMING 0x4 |
| 70 | #define NCS_OVERRUN 0x8 |
| 71 | |
| 72 | /* cause we need SOME parameters ... */ |
| 73 | #define MIN_BAUD_SUPPORTED 1200 |
| 74 | #define MAX_BAUD_SUPPORTED 115200 |
| 75 | |
| 76 | /* protocol types supported */ |
| 77 | #define PROTO_RS232 0 |
| 78 | #define PROTO_RS422 1 |
| 79 | |
| 80 | /* Notification types */ |
| 81 | #define N_DATA_READY 0x01 |
| 82 | #define N_OUTPUT_LOWAT 0x02 |
| 83 | #define N_BREAK 0x04 |
| 84 | #define N_PARITY_ERROR 0x08 |
| 85 | #define N_FRAMING_ERROR 0x10 |
| 86 | #define N_OVERRUN_ERROR 0x20 |
| 87 | #define N_DDCD 0x40 |
| 88 | #define N_DCTS 0x80 |
| 89 | |
| 90 | #define N_ALL_INPUT (N_DATA_READY | N_BREAK \ |
| 91 | | N_PARITY_ERROR | N_FRAMING_ERROR \ |
| 92 | | N_OVERRUN_ERROR | N_DDCD | N_DCTS) |
| 93 | |
| 94 | #define N_ALL_OUTPUT N_OUTPUT_LOWAT |
| 95 | |
| 96 | #define N_ALL_ERRORS (N_PARITY_ERROR | N_FRAMING_ERROR \ |
| 97 | | N_OVERRUN_ERROR) |
| 98 | |
| 99 | #define N_ALL (N_DATA_READY | N_OUTPUT_LOWAT | N_BREAK \ |
| 100 | | N_PARITY_ERROR | N_FRAMING_ERROR \ |
| 101 | | N_OVERRUN_ERROR | N_DDCD | N_DCTS) |
| 102 | |
| 103 | #define SER_CLK_SPEED(prediv) ((22000000 << 1) / prediv) |
| 104 | #define SER_DIVISOR(x, clk) (((clk) + (x) * 8) / ((x) * 16)) |
| 105 | #define DIVISOR_TO_BAUD(div, clk) ((clk) / 16 / (div)) |
| 106 | |
| 107 | /* Some masks */ |
| 108 | #define LCR_MASK_BITS_CHAR (UART_LCR_WLEN5 | UART_LCR_WLEN6 \ |
| 109 | | UART_LCR_WLEN7 | UART_LCR_WLEN8) |
| 110 | #define LCR_MASK_STOP_BITS (UART_LCR_STOP) |
| 111 | |
| 112 | #define PENDING(_a, _p) (readl(&(_p)->vma->sio_ir) & (_a)->ic_enable) |
| 113 | |
| 114 | #define RING_BUF_SIZE 4096 |
| 115 | #define BUF_SIZE_BIT SBBR_L_SIZE |
| 116 | #define PROD_CONS_MASK PROD_CONS_PTR_4K |
| 117 | |
| 118 | #define TOTAL_RING_BUF_SIZE (RING_BUF_SIZE * 4) |
| 119 | |
| 120 | /* driver specific - one per card */ |
| 121 | struct ioc3_card { |
| 122 | struct { |
| 123 | /* uart ports are allocated here */ |
| 124 | struct uart_port icp_uart_port[LOGICAL_PORTS]; |
| 125 | /* the ioc3_port used for this port */ |
| 126 | struct ioc3_port *icp_port; |
| 127 | } ic_port[PORTS_PER_CARD]; |
| 128 | /* currently enabled interrupts */ |
| 129 | uint32_t ic_enable; |
| 130 | }; |
| 131 | |
| 132 | /* Local port info for each IOC3 serial port */ |
| 133 | struct ioc3_port { |
| 134 | /* handy reference material */ |
| 135 | struct uart_port *ip_port; |
| 136 | struct ioc3_card *ip_card; |
| 137 | struct ioc3_driver_data *ip_idd; |
| 138 | struct ioc3_submodule *ip_is; |
| 139 | |
| 140 | /* pci mem addresses for this port */ |
| 141 | struct ioc3_serialregs __iomem *ip_serial_regs; |
| 142 | struct ioc3_uartregs __iomem *ip_uart_regs; |
| 143 | |
| 144 | /* Ring buffer page for this port */ |
| 145 | dma_addr_t ip_dma_ringbuf; |
| 146 | /* vaddr of ring buffer */ |
| 147 | struct ring_buffer *ip_cpu_ringbuf; |
| 148 | |
| 149 | /* Rings for this port */ |
| 150 | struct ring *ip_inring; |
| 151 | struct ring *ip_outring; |
| 152 | |
| 153 | /* Hook to port specific values */ |
| 154 | struct port_hooks *ip_hooks; |
| 155 | |
| 156 | spinlock_t ip_lock; |
| 157 | |
| 158 | /* Various rx/tx parameters */ |
| 159 | int ip_baud; |
| 160 | int ip_tx_lowat; |
| 161 | int ip_rx_timeout; |
| 162 | |
| 163 | /* Copy of notification bits */ |
| 164 | int ip_notify; |
| 165 | |
| 166 | /* Shadow copies of various registers so we don't need to PIO |
| 167 | * read them constantly |
| 168 | */ |
| 169 | uint32_t ip_sscr; |
| 170 | uint32_t ip_tx_prod; |
| 171 | uint32_t ip_rx_cons; |
| 172 | unsigned char ip_flags; |
| 173 | }; |
| 174 | |
| 175 | /* tx low water mark. We need to notify the driver whenever tx is getting |
| 176 | * close to empty so it can refill the tx buffer and keep things going. |
| 177 | * Let's assume that if we interrupt 1 ms before the tx goes idle, we'll |
| 178 | * have no trouble getting in more chars in time (I certainly hope so). |
| 179 | */ |
| 180 | #define TX_LOWAT_LATENCY 1000 |
| 181 | #define TX_LOWAT_HZ (1000000 / TX_LOWAT_LATENCY) |
| 182 | #define TX_LOWAT_CHARS(baud) (baud / 10 / TX_LOWAT_HZ) |
| 183 | |
| 184 | /* Flags per port */ |
| 185 | #define INPUT_HIGH 0x01 |
| 186 | /* used to signify that we have turned off the rx_high |
| 187 | * temporarily - we need to drain the fifo and don't |
| 188 | * want to get blasted with interrupts. |
| 189 | */ |
| 190 | #define DCD_ON 0x02 |
| 191 | /* DCD state is on */ |
| 192 | #define LOWAT_WRITTEN 0x04 |
| 193 | #define READ_ABORTED 0x08 |
| 194 | /* the read was aborted - used to avaoid infinate looping |
| 195 | * in the interrupt handler |
| 196 | */ |
| 197 | #define INPUT_ENABLE 0x10 |
| 198 | |
| 199 | /* Since each port has different register offsets and bitmasks |
| 200 | * for everything, we'll store those that we need in tables so we |
| 201 | * don't have to be constantly checking the port we are dealing with. |
| 202 | */ |
| 203 | struct port_hooks { |
| 204 | uint32_t intr_delta_dcd; |
| 205 | uint32_t intr_delta_cts; |
| 206 | uint32_t intr_tx_mt; |
| 207 | uint32_t intr_rx_timer; |
| 208 | uint32_t intr_rx_high; |
| 209 | uint32_t intr_tx_explicit; |
| 210 | uint32_t intr_clear; |
| 211 | uint32_t intr_all; |
| 212 | char rs422_select_pin; |
| 213 | }; |
| 214 | |
| 215 | static struct port_hooks hooks_array[PORTS_PER_CARD] = { |
| 216 | /* values for port A */ |
| 217 | { |
| 218 | .intr_delta_dcd = SIO_IR_SA_DELTA_DCD, |
| 219 | .intr_delta_cts = SIO_IR_SA_DELTA_CTS, |
| 220 | .intr_tx_mt = SIO_IR_SA_TX_MT, |
| 221 | .intr_rx_timer = SIO_IR_SA_RX_TIMER, |
| 222 | .intr_rx_high = SIO_IR_SA_RX_HIGH, |
| 223 | .intr_tx_explicit = SIO_IR_SA_TX_EXPLICIT, |
| 224 | .intr_clear = (SIO_IR_SA_TX_MT | SIO_IR_SA_RX_FULL |
| 225 | | SIO_IR_SA_RX_HIGH |
| 226 | | SIO_IR_SA_RX_TIMER |
| 227 | | SIO_IR_SA_DELTA_DCD |
| 228 | | SIO_IR_SA_DELTA_CTS |
| 229 | | SIO_IR_SA_INT |
| 230 | | SIO_IR_SA_TX_EXPLICIT |
| 231 | | SIO_IR_SA_MEMERR), |
| 232 | .intr_all = SIO_IR_SA, |
| 233 | .rs422_select_pin = GPPR_UARTA_MODESEL_PIN, |
| 234 | }, |
| 235 | |
| 236 | /* values for port B */ |
| 237 | { |
| 238 | .intr_delta_dcd = SIO_IR_SB_DELTA_DCD, |
| 239 | .intr_delta_cts = SIO_IR_SB_DELTA_CTS, |
| 240 | .intr_tx_mt = SIO_IR_SB_TX_MT, |
| 241 | .intr_rx_timer = SIO_IR_SB_RX_TIMER, |
| 242 | .intr_rx_high = SIO_IR_SB_RX_HIGH, |
| 243 | .intr_tx_explicit = SIO_IR_SB_TX_EXPLICIT, |
| 244 | .intr_clear = (SIO_IR_SB_TX_MT | SIO_IR_SB_RX_FULL |
| 245 | | SIO_IR_SB_RX_HIGH |
| 246 | | SIO_IR_SB_RX_TIMER |
| 247 | | SIO_IR_SB_DELTA_DCD |
| 248 | | SIO_IR_SB_DELTA_CTS |
| 249 | | SIO_IR_SB_INT |
| 250 | | SIO_IR_SB_TX_EXPLICIT |
| 251 | | SIO_IR_SB_MEMERR), |
| 252 | .intr_all = SIO_IR_SB, |
| 253 | .rs422_select_pin = GPPR_UARTB_MODESEL_PIN, |
| 254 | } |
| 255 | }; |
| 256 | |
| 257 | struct ring_entry { |
| 258 | union { |
| 259 | struct { |
| 260 | uint32_t alldata; |
| 261 | uint32_t allsc; |
| 262 | } all; |
| 263 | struct { |
| 264 | char data[4]; /* data bytes */ |
| 265 | char sc[4]; /* status/control */ |
| 266 | } s; |
| 267 | } u; |
| 268 | }; |
| 269 | |
| 270 | /* Test the valid bits in any of the 4 sc chars using "allsc" member */ |
| 271 | #define RING_ANY_VALID \ |
| 272 | ((uint32_t)(RXSB_MODEM_VALID | RXSB_DATA_VALID) * 0x01010101) |
| 273 | |
| 274 | #define ring_sc u.s.sc |
| 275 | #define ring_data u.s.data |
| 276 | #define ring_allsc u.all.allsc |
| 277 | |
| 278 | /* Number of entries per ring buffer. */ |
| 279 | #define ENTRIES_PER_RING (RING_BUF_SIZE / (int) sizeof(struct ring_entry)) |
| 280 | |
| 281 | /* An individual ring */ |
| 282 | struct ring { |
| 283 | struct ring_entry entries[ENTRIES_PER_RING]; |
| 284 | }; |
| 285 | |
| 286 | /* The whole enchilada */ |
| 287 | struct ring_buffer { |
| 288 | struct ring TX_A; |
| 289 | struct ring RX_A; |
| 290 | struct ring TX_B; |
| 291 | struct ring RX_B; |
| 292 | }; |
| 293 | |
| 294 | /* Get a ring from a port struct */ |
| 295 | #define RING(_p, _wh) &(((struct ring_buffer *)((_p)->ip_cpu_ringbuf))->_wh) |
| 296 | |
| 297 | /* for Infinite loop detection */ |
| 298 | #define MAXITER 10000000 |
| 299 | |
| 300 | |
| 301 | /** |
| 302 | * set_baud - Baud rate setting code |
| 303 | * @port: port to set |
| 304 | * @baud: baud rate to use |
| 305 | */ |
| 306 | static int set_baud(struct ioc3_port *port, int baud) |
| 307 | { |
| 308 | int divisor; |
| 309 | int actual_baud; |
| 310 | int diff; |
| 311 | int lcr, prediv; |
| 312 | struct ioc3_uartregs __iomem *uart; |
| 313 | |
| 314 | for (prediv = 6; prediv < 64; prediv++) { |
| 315 | divisor = SER_DIVISOR(baud, SER_CLK_SPEED(prediv)); |
| 316 | if (!divisor) |
| 317 | continue; /* invalid divisor */ |
| 318 | actual_baud = DIVISOR_TO_BAUD(divisor, SER_CLK_SPEED(prediv)); |
| 319 | |
| 320 | diff = actual_baud - baud; |
| 321 | if (diff < 0) |
| 322 | diff = -diff; |
| 323 | |
| 324 | /* if we're within 1% we've found a match */ |
| 325 | if (diff * 100 <= actual_baud) |
| 326 | break; |
| 327 | } |
| 328 | |
| 329 | /* if the above loop completed, we didn't match |
| 330 | * the baud rate. give up. |
| 331 | */ |
| 332 | if (prediv == 64) { |
| 333 | NOT_PROGRESS(); |
| 334 | return 1; |
| 335 | } |
| 336 | |
| 337 | uart = port->ip_uart_regs; |
| 338 | lcr = readb(&uart->iu_lcr); |
| 339 | |
| 340 | writeb(lcr | UART_LCR_DLAB, &uart->iu_lcr); |
| 341 | writeb((unsigned char)divisor, &uart->iu_dll); |
| 342 | writeb((unsigned char)(divisor >> 8), &uart->iu_dlm); |
| 343 | writeb((unsigned char)prediv, &uart->iu_scr); |
| 344 | writeb((unsigned char)lcr, &uart->iu_lcr); |
| 345 | |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | /** |
| 350 | * get_ioc3_port - given a uart port, return the control structure |
| 351 | * @the_port: uart port to find |
| 352 | */ |
| 353 | static struct ioc3_port *get_ioc3_port(struct uart_port *the_port) |
| 354 | { |
| 355 | struct ioc3_driver_data *idd = dev_get_drvdata(the_port->dev); |
| 356 | struct ioc3_card *card_ptr = idd->data[Submodule_slot]; |
| 357 | int ii, jj; |
| 358 | |
| 359 | if (!card_ptr) { |
| 360 | NOT_PROGRESS(); |
| 361 | return NULL; |
| 362 | } |
| 363 | for (ii = 0; ii < PORTS_PER_CARD; ii++) { |
| 364 | for (jj = 0; jj < LOGICAL_PORTS; jj++) { |
| 365 | if (the_port == &card_ptr->ic_port[ii].icp_uart_port[jj]) |
| 366 | return card_ptr->ic_port[ii].icp_port; |
| 367 | } |
| 368 | } |
| 369 | NOT_PROGRESS(); |
| 370 | return NULL; |
| 371 | } |
| 372 | |
| 373 | /** |
| 374 | * port_init - Initialize the sio and ioc3 hardware for a given port |
| 375 | * called per port from attach... |
| 376 | * @port: port to initialize |
| 377 | */ |
| 378 | static int inline port_init(struct ioc3_port *port) |
| 379 | { |
| 380 | uint32_t sio_cr; |
| 381 | struct port_hooks *hooks = port->ip_hooks; |
| 382 | struct ioc3_uartregs __iomem *uart; |
| 383 | int reset_loop_counter = 0xfffff; |
| 384 | struct ioc3_driver_data *idd = port->ip_idd; |
| 385 | |
| 386 | /* Idle the IOC3 serial interface */ |
| 387 | writel(SSCR_RESET, &port->ip_serial_regs->sscr); |
| 388 | |
| 389 | /* Wait until any pending bus activity for this port has ceased */ |
| 390 | do { |
| 391 | sio_cr = readl(&idd->vma->sio_cr); |
| 392 | if (reset_loop_counter-- <= 0) { |
| 393 | printk(KERN_WARNING |
| 394 | "IOC3 unable to come out of reset" |
| 395 | " scr 0x%x\n", sio_cr); |
| 396 | return -1; |
| 397 | } |
| 398 | } while (!(sio_cr & SIO_CR_ARB_DIAG_IDLE) && |
| 399 | (((sio_cr &= SIO_CR_ARB_DIAG) == SIO_CR_ARB_DIAG_TXA) |
| 400 | || sio_cr == SIO_CR_ARB_DIAG_TXB |
| 401 | || sio_cr == SIO_CR_ARB_DIAG_RXA |
| 402 | || sio_cr == SIO_CR_ARB_DIAG_RXB)); |
| 403 | |
| 404 | /* Finish reset sequence */ |
| 405 | writel(0, &port->ip_serial_regs->sscr); |
| 406 | |
| 407 | /* Once RESET is done, reload cached tx_prod and rx_cons values |
| 408 | * and set rings to empty by making prod == cons |
| 409 | */ |
| 410 | port->ip_tx_prod = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK; |
| 411 | writel(port->ip_tx_prod, &port->ip_serial_regs->stpir); |
| 412 | port->ip_rx_cons = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK; |
| 413 | writel(port->ip_rx_cons | SRCIR_ARM, &port->ip_serial_regs->srcir); |
| 414 | |
| 415 | /* Disable interrupts for this 16550 */ |
| 416 | uart = port->ip_uart_regs; |
| 417 | writeb(0, &uart->iu_lcr); |
| 418 | writeb(0, &uart->iu_ier); |
| 419 | |
| 420 | /* Set the default baud */ |
| 421 | set_baud(port, port->ip_baud); |
| 422 | |
| 423 | /* Set line control to 8 bits no parity */ |
| 424 | writeb(UART_LCR_WLEN8 | 0, &uart->iu_lcr); |
| 425 | /* UART_LCR_STOP == 1 stop */ |
| 426 | |
| 427 | /* Enable the FIFOs */ |
| 428 | writeb(UART_FCR_ENABLE_FIFO, &uart->iu_fcr); |
| 429 | /* then reset 16550 FIFOs */ |
| 430 | writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT, |
| 431 | &uart->iu_fcr); |
| 432 | |
| 433 | /* Clear modem control register */ |
| 434 | writeb(0, &uart->iu_mcr); |
| 435 | |
| 436 | /* Clear deltas in modem status register */ |
| 437 | writel(0, &port->ip_serial_regs->shadow); |
| 438 | |
| 439 | /* Only do this once per port pair */ |
| 440 | if (port->ip_hooks == &hooks_array[0]) { |
| 441 | unsigned long ring_pci_addr; |
| 442 | uint32_t __iomem *sbbr_l, *sbbr_h; |
| 443 | |
| 444 | sbbr_l = &idd->vma->sbbr_l; |
| 445 | sbbr_h = &idd->vma->sbbr_h; |
| 446 | ring_pci_addr = (unsigned long __iomem)port->ip_dma_ringbuf; |
| 447 | DPRINT_CONFIG(("%s: ring_pci_addr 0x%p\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 448 | __func__, (void *)ring_pci_addr)); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 449 | |
| 450 | writel((unsigned int)((uint64_t) ring_pci_addr >> 32), sbbr_h); |
| 451 | writel((unsigned int)ring_pci_addr | BUF_SIZE_BIT, sbbr_l); |
| 452 | } |
| 453 | |
| 454 | /* Set the receive timeout value to 10 msec */ |
| 455 | writel(SRTR_HZ / 100, &port->ip_serial_regs->srtr); |
| 456 | |
| 457 | /* Set rx threshold, enable DMA */ |
| 458 | /* Set high water mark at 3/4 of full ring */ |
| 459 | port->ip_sscr = (ENTRIES_PER_RING * 3 / 4); |
| 460 | |
| 461 | /* uart experiences pauses at high baud rate reducing actual |
| 462 | * throughput by 10% or so unless we enable high speed polling |
| 463 | * XXX when this hardware bug is resolved we should revert to |
| 464 | * normal polling speed |
| 465 | */ |
| 466 | port->ip_sscr |= SSCR_HIGH_SPD; |
| 467 | |
| 468 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); |
| 469 | |
| 470 | /* Disable and clear all serial related interrupt bits */ |
| 471 | port->ip_card->ic_enable &= ~hooks->intr_clear; |
| 472 | ioc3_disable(port->ip_is, idd, hooks->intr_clear); |
| 473 | ioc3_ack(port->ip_is, idd, hooks->intr_clear); |
| 474 | return 0; |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * enable_intrs - enable interrupts |
| 479 | * @port: port to enable |
| 480 | * @mask: mask to use |
| 481 | */ |
| 482 | static void enable_intrs(struct ioc3_port *port, uint32_t mask) |
| 483 | { |
| 484 | if ((port->ip_card->ic_enable & mask) != mask) { |
| 485 | port->ip_card->ic_enable |= mask; |
| 486 | ioc3_enable(port->ip_is, port->ip_idd, mask); |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | /** |
| 491 | * local_open - local open a port |
| 492 | * @port: port to open |
| 493 | */ |
| 494 | static inline int local_open(struct ioc3_port *port) |
| 495 | { |
| 496 | int spiniter = 0; |
| 497 | |
| 498 | port->ip_flags = INPUT_ENABLE; |
| 499 | |
| 500 | /* Pause the DMA interface if necessary */ |
| 501 | if (port->ip_sscr & SSCR_DMA_EN) { |
| 502 | writel(port->ip_sscr | SSCR_DMA_PAUSE, |
| 503 | &port->ip_serial_regs->sscr); |
| 504 | while ((readl(&port->ip_serial_regs->sscr) |
| 505 | & SSCR_PAUSE_STATE) == 0) { |
| 506 | spiniter++; |
| 507 | if (spiniter > MAXITER) { |
| 508 | NOT_PROGRESS(); |
| 509 | return -1; |
| 510 | } |
| 511 | } |
| 512 | } |
| 513 | |
| 514 | /* Reset the input fifo. If the uart received chars while the port |
| 515 | * was closed and DMA is not enabled, the uart may have a bunch of |
| 516 | * chars hanging around in its rx fifo which will not be discarded |
| 517 | * by rclr in the upper layer. We must get rid of them here. |
| 518 | */ |
| 519 | writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR, |
| 520 | &port->ip_uart_regs->iu_fcr); |
| 521 | |
| 522 | writeb(UART_LCR_WLEN8, &port->ip_uart_regs->iu_lcr); |
| 523 | /* UART_LCR_STOP == 1 stop */ |
| 524 | |
| 525 | /* Re-enable DMA, set default threshold to intr whenever there is |
| 526 | * data available. |
| 527 | */ |
| 528 | port->ip_sscr &= ~SSCR_RX_THRESHOLD; |
| 529 | port->ip_sscr |= 1; /* default threshold */ |
| 530 | |
| 531 | /* Plug in the new sscr. This implicitly clears the DMA_PAUSE |
| 532 | * flag if it was set above |
| 533 | */ |
| 534 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); |
| 535 | port->ip_tx_lowat = 1; |
| 536 | return 0; |
| 537 | } |
| 538 | |
| 539 | /** |
| 540 | * set_rx_timeout - Set rx timeout and threshold values. |
| 541 | * @port: port to use |
| 542 | * @timeout: timeout value in ticks |
| 543 | */ |
| 544 | static inline int set_rx_timeout(struct ioc3_port *port, int timeout) |
| 545 | { |
| 546 | int threshold; |
| 547 | |
| 548 | port->ip_rx_timeout = timeout; |
| 549 | |
| 550 | /* Timeout is in ticks. Let's figure out how many chars we |
| 551 | * can receive at the current baud rate in that interval |
| 552 | * and set the rx threshold to that amount. There are 4 chars |
| 553 | * per ring entry, so we'll divide the number of chars that will |
| 554 | * arrive in timeout by 4. |
| 555 | * So .... timeout * baud / 10 / HZ / 4, with HZ = 100. |
| 556 | */ |
| 557 | threshold = timeout * port->ip_baud / 4000; |
| 558 | if (threshold == 0) |
| 559 | threshold = 1; /* otherwise we'll intr all the time! */ |
| 560 | |
| 561 | if ((unsigned)threshold > (unsigned)SSCR_RX_THRESHOLD) |
| 562 | return 1; |
| 563 | |
| 564 | port->ip_sscr &= ~SSCR_RX_THRESHOLD; |
| 565 | port->ip_sscr |= threshold; |
| 566 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); |
| 567 | |
| 568 | /* Now set the rx timeout to the given value |
| 569 | * again timeout * SRTR_HZ / HZ |
| 570 | */ |
| 571 | timeout = timeout * SRTR_HZ / 100; |
| 572 | if (timeout > SRTR_CNT) |
| 573 | timeout = SRTR_CNT; |
| 574 | writel(timeout, &port->ip_serial_regs->srtr); |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | /** |
| 579 | * config_port - config the hardware |
| 580 | * @port: port to config |
| 581 | * @baud: baud rate for the port |
| 582 | * @byte_size: data size |
| 583 | * @stop_bits: number of stop bits |
| 584 | * @parenb: parity enable ? |
| 585 | * @parodd: odd parity ? |
| 586 | */ |
| 587 | static inline int |
| 588 | config_port(struct ioc3_port *port, |
| 589 | int baud, int byte_size, int stop_bits, int parenb, int parodd) |
| 590 | { |
| 591 | char lcr, sizebits; |
| 592 | int spiniter = 0; |
| 593 | |
| 594 | DPRINT_CONFIG(("%s: line %d baud %d byte_size %d stop %d parenb %d " |
| 595 | "parodd %d\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 596 | __func__, ((struct uart_port *)port->ip_port)->line, |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 597 | baud, byte_size, stop_bits, parenb, parodd)); |
| 598 | |
| 599 | if (set_baud(port, baud)) |
| 600 | return 1; |
| 601 | |
| 602 | switch (byte_size) { |
| 603 | case 5: |
| 604 | sizebits = UART_LCR_WLEN5; |
| 605 | break; |
| 606 | case 6: |
| 607 | sizebits = UART_LCR_WLEN6; |
| 608 | break; |
| 609 | case 7: |
| 610 | sizebits = UART_LCR_WLEN7; |
| 611 | break; |
| 612 | case 8: |
| 613 | sizebits = UART_LCR_WLEN8; |
| 614 | break; |
| 615 | default: |
| 616 | return 1; |
| 617 | } |
| 618 | |
| 619 | /* Pause the DMA interface if necessary */ |
| 620 | if (port->ip_sscr & SSCR_DMA_EN) { |
| 621 | writel(port->ip_sscr | SSCR_DMA_PAUSE, |
| 622 | &port->ip_serial_regs->sscr); |
| 623 | while ((readl(&port->ip_serial_regs->sscr) |
| 624 | & SSCR_PAUSE_STATE) == 0) { |
| 625 | spiniter++; |
| 626 | if (spiniter > MAXITER) |
| 627 | return -1; |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | /* Clear relevant fields in lcr */ |
| 632 | lcr = readb(&port->ip_uart_regs->iu_lcr); |
| 633 | lcr &= ~(LCR_MASK_BITS_CHAR | UART_LCR_EPAR | |
| 634 | UART_LCR_PARITY | LCR_MASK_STOP_BITS); |
| 635 | |
| 636 | /* Set byte size in lcr */ |
| 637 | lcr |= sizebits; |
| 638 | |
| 639 | /* Set parity */ |
| 640 | if (parenb) { |
| 641 | lcr |= UART_LCR_PARITY; |
| 642 | if (!parodd) |
| 643 | lcr |= UART_LCR_EPAR; |
| 644 | } |
| 645 | |
| 646 | /* Set stop bits */ |
| 647 | if (stop_bits) |
| 648 | lcr |= UART_LCR_STOP /* 2 stop bits */ ; |
| 649 | |
| 650 | writeb(lcr, &port->ip_uart_regs->iu_lcr); |
| 651 | |
| 652 | /* Re-enable the DMA interface if necessary */ |
| 653 | if (port->ip_sscr & SSCR_DMA_EN) { |
| 654 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); |
| 655 | } |
| 656 | port->ip_baud = baud; |
| 657 | |
| 658 | /* When we get within this number of ring entries of filling the |
| 659 | * entire ring on tx, place an EXPLICIT intr to generate a lowat |
| 660 | * notification when output has drained. |
| 661 | */ |
| 662 | port->ip_tx_lowat = (TX_LOWAT_CHARS(baud) + 3) / 4; |
| 663 | if (port->ip_tx_lowat == 0) |
| 664 | port->ip_tx_lowat = 1; |
| 665 | |
| 666 | set_rx_timeout(port, 2); |
| 667 | return 0; |
| 668 | } |
| 669 | |
| 670 | /** |
| 671 | * do_write - Write bytes to the port. Returns the number of bytes |
| 672 | * actually written. Called from transmit_chars |
| 673 | * @port: port to use |
| 674 | * @buf: the stuff to write |
| 675 | * @len: how many bytes in 'buf' |
| 676 | */ |
| 677 | static inline int do_write(struct ioc3_port *port, char *buf, int len) |
| 678 | { |
| 679 | int prod_ptr, cons_ptr, total = 0; |
| 680 | struct ring *outring; |
| 681 | struct ring_entry *entry; |
| 682 | struct port_hooks *hooks = port->ip_hooks; |
| 683 | |
| 684 | BUG_ON(!(len >= 0)); |
| 685 | |
| 686 | prod_ptr = port->ip_tx_prod; |
| 687 | cons_ptr = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK; |
| 688 | outring = port->ip_outring; |
| 689 | |
| 690 | /* Maintain a 1-entry red-zone. The ring buffer is full when |
| 691 | * (cons - prod) % ring_size is 1. Rather than do this subtraction |
| 692 | * in the body of the loop, I'll do it now. |
| 693 | */ |
| 694 | cons_ptr = (cons_ptr - (int)sizeof(struct ring_entry)) & PROD_CONS_MASK; |
| 695 | |
| 696 | /* Stuff the bytes into the output */ |
| 697 | while ((prod_ptr != cons_ptr) && (len > 0)) { |
| 698 | int xx; |
| 699 | |
| 700 | /* Get 4 bytes (one ring entry) at a time */ |
| 701 | entry = (struct ring_entry *)((caddr_t) outring + prod_ptr); |
| 702 | |
| 703 | /* Invalidate all entries */ |
| 704 | entry->ring_allsc = 0; |
| 705 | |
| 706 | /* Copy in some bytes */ |
| 707 | for (xx = 0; (xx < 4) && (len > 0); xx++) { |
| 708 | entry->ring_data[xx] = *buf++; |
| 709 | entry->ring_sc[xx] = TXCB_VALID; |
| 710 | len--; |
| 711 | total++; |
| 712 | } |
| 713 | |
| 714 | /* If we are within some small threshold of filling up the |
| 715 | * entire ring buffer, we must place an EXPLICIT intr here |
| 716 | * to generate a lowat interrupt in case we subsequently |
| 717 | * really do fill up the ring and the caller goes to sleep. |
| 718 | * No need to place more than one though. |
| 719 | */ |
| 720 | if (!(port->ip_flags & LOWAT_WRITTEN) && |
| 721 | ((cons_ptr - prod_ptr) & PROD_CONS_MASK) |
| 722 | <= port->ip_tx_lowat * (int)sizeof(struct ring_entry)) { |
| 723 | port->ip_flags |= LOWAT_WRITTEN; |
| 724 | entry->ring_sc[0] |= TXCB_INT_WHEN_DONE; |
| 725 | } |
| 726 | |
| 727 | /* Go on to next entry */ |
| 728 | prod_ptr += sizeof(struct ring_entry); |
| 729 | prod_ptr &= PROD_CONS_MASK; |
| 730 | } |
| 731 | |
| 732 | /* If we sent something, start DMA if necessary */ |
| 733 | if (total > 0 && !(port->ip_sscr & SSCR_DMA_EN)) { |
| 734 | port->ip_sscr |= SSCR_DMA_EN; |
| 735 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); |
| 736 | } |
| 737 | |
| 738 | /* Store the new producer pointer. If tx is disabled, we stuff the |
| 739 | * data into the ring buffer, but we don't actually start tx. |
| 740 | */ |
| 741 | if (!uart_tx_stopped(port->ip_port)) { |
| 742 | writel(prod_ptr, &port->ip_serial_regs->stpir); |
| 743 | |
| 744 | /* If we are now transmitting, enable tx_mt interrupt so we |
| 745 | * can disable DMA if necessary when the tx finishes. |
| 746 | */ |
| 747 | if (total > 0) |
| 748 | enable_intrs(port, hooks->intr_tx_mt); |
| 749 | } |
| 750 | port->ip_tx_prod = prod_ptr; |
| 751 | |
| 752 | return total; |
| 753 | } |
| 754 | |
| 755 | /** |
| 756 | * disable_intrs - disable interrupts |
| 757 | * @port: port to enable |
| 758 | * @mask: mask to use |
| 759 | */ |
| 760 | static inline void disable_intrs(struct ioc3_port *port, uint32_t mask) |
| 761 | { |
| 762 | if (port->ip_card->ic_enable & mask) { |
| 763 | ioc3_disable(port->ip_is, port->ip_idd, mask); |
| 764 | port->ip_card->ic_enable &= ~mask; |
| 765 | } |
| 766 | } |
| 767 | |
| 768 | /** |
| 769 | * set_notification - Modify event notification |
| 770 | * @port: port to use |
| 771 | * @mask: events mask |
| 772 | * @set_on: set ? |
| 773 | */ |
| 774 | static int set_notification(struct ioc3_port *port, int mask, int set_on) |
| 775 | { |
| 776 | struct port_hooks *hooks = port->ip_hooks; |
| 777 | uint32_t intrbits, sscrbits; |
| 778 | |
| 779 | BUG_ON(!mask); |
| 780 | |
| 781 | intrbits = sscrbits = 0; |
| 782 | |
| 783 | if (mask & N_DATA_READY) |
| 784 | intrbits |= (hooks->intr_rx_timer | hooks->intr_rx_high); |
| 785 | if (mask & N_OUTPUT_LOWAT) |
| 786 | intrbits |= hooks->intr_tx_explicit; |
| 787 | if (mask & N_DDCD) { |
| 788 | intrbits |= hooks->intr_delta_dcd; |
| 789 | sscrbits |= SSCR_RX_RING_DCD; |
| 790 | } |
| 791 | if (mask & N_DCTS) |
| 792 | intrbits |= hooks->intr_delta_cts; |
| 793 | |
| 794 | if (set_on) { |
| 795 | enable_intrs(port, intrbits); |
| 796 | port->ip_notify |= mask; |
| 797 | port->ip_sscr |= sscrbits; |
| 798 | } else { |
| 799 | disable_intrs(port, intrbits); |
| 800 | port->ip_notify &= ~mask; |
| 801 | port->ip_sscr &= ~sscrbits; |
| 802 | } |
| 803 | |
| 804 | /* We require DMA if either DATA_READY or DDCD notification is |
| 805 | * currently requested. If neither of these is requested and |
| 806 | * there is currently no tx in progress, DMA may be disabled. |
| 807 | */ |
| 808 | if (port->ip_notify & (N_DATA_READY | N_DDCD)) |
| 809 | port->ip_sscr |= SSCR_DMA_EN; |
| 810 | else if (!(port->ip_card->ic_enable & hooks->intr_tx_mt)) |
| 811 | port->ip_sscr &= ~SSCR_DMA_EN; |
| 812 | |
| 813 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); |
| 814 | return 0; |
| 815 | } |
| 816 | |
| 817 | /** |
| 818 | * set_mcr - set the master control reg |
| 819 | * @the_port: port to use |
| 820 | * @mask1: mcr mask |
| 821 | * @mask2: shadow mask |
| 822 | */ |
| 823 | static inline int set_mcr(struct uart_port *the_port, |
| 824 | int mask1, int mask2) |
| 825 | { |
| 826 | struct ioc3_port *port = get_ioc3_port(the_port); |
| 827 | uint32_t shadow; |
| 828 | int spiniter = 0; |
| 829 | char mcr; |
| 830 | |
| 831 | if (!port) |
| 832 | return -1; |
| 833 | |
| 834 | /* Pause the DMA interface if necessary */ |
| 835 | if (port->ip_sscr & SSCR_DMA_EN) { |
| 836 | writel(port->ip_sscr | SSCR_DMA_PAUSE, |
| 837 | &port->ip_serial_regs->sscr); |
| 838 | while ((readl(&port->ip_serial_regs->sscr) |
| 839 | & SSCR_PAUSE_STATE) == 0) { |
| 840 | spiniter++; |
| 841 | if (spiniter > MAXITER) |
| 842 | return -1; |
| 843 | } |
| 844 | } |
| 845 | shadow = readl(&port->ip_serial_regs->shadow); |
| 846 | mcr = (shadow & 0xff000000) >> 24; |
| 847 | |
| 848 | /* Set new value */ |
| 849 | mcr |= mask1; |
| 850 | shadow |= mask2; |
| 851 | writeb(mcr, &port->ip_uart_regs->iu_mcr); |
| 852 | writel(shadow, &port->ip_serial_regs->shadow); |
| 853 | |
| 854 | /* Re-enable the DMA interface if necessary */ |
| 855 | if (port->ip_sscr & SSCR_DMA_EN) { |
| 856 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); |
| 857 | } |
| 858 | return 0; |
| 859 | } |
| 860 | |
| 861 | /** |
| 862 | * ioc3_set_proto - set the protocol for the port |
| 863 | * @port: port to use |
| 864 | * @proto: protocol to use |
| 865 | */ |
| 866 | static int ioc3_set_proto(struct ioc3_port *port, int proto) |
| 867 | { |
| 868 | struct port_hooks *hooks = port->ip_hooks; |
| 869 | |
| 870 | switch (proto) { |
| 871 | default: |
| 872 | case PROTO_RS232: |
| 873 | /* Clear the appropriate GIO pin */ |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 874 | DPRINT_CONFIG(("%s: rs232\n", __func__)); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 875 | writel(0, (&port->ip_idd->vma->gppr[0] |
| 876 | + hooks->rs422_select_pin)); |
| 877 | break; |
| 878 | |
| 879 | case PROTO_RS422: |
| 880 | /* Set the appropriate GIO pin */ |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 881 | DPRINT_CONFIG(("%s: rs422\n", __func__)); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 882 | writel(1, (&port->ip_idd->vma->gppr[0] |
| 883 | + hooks->rs422_select_pin)); |
| 884 | break; |
| 885 | } |
| 886 | return 0; |
| 887 | } |
| 888 | |
| 889 | /** |
| 890 | * transmit_chars - upper level write, called with the_port->lock |
| 891 | * @the_port: port to write |
| 892 | */ |
| 893 | static void transmit_chars(struct uart_port *the_port) |
| 894 | { |
| 895 | int xmit_count, tail, head; |
| 896 | int result; |
| 897 | char *start; |
| 898 | struct tty_struct *tty; |
| 899 | struct ioc3_port *port = get_ioc3_port(the_port); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 900 | struct uart_state *state; |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 901 | |
| 902 | if (!the_port) |
| 903 | return; |
| 904 | if (!port) |
| 905 | return; |
| 906 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 907 | state = the_port->state; |
| 908 | tty = state->port.tty; |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 909 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 910 | if (uart_circ_empty(&state->xmit) || uart_tx_stopped(the_port)) { |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 911 | /* Nothing to do or hw stopped */ |
| 912 | set_notification(port, N_ALL_OUTPUT, 0); |
| 913 | return; |
| 914 | } |
| 915 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 916 | head = state->xmit.head; |
| 917 | tail = state->xmit.tail; |
| 918 | start = (char *)&state->xmit.buf[tail]; |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 919 | |
| 920 | /* write out all the data or until the end of the buffer */ |
| 921 | xmit_count = (head < tail) ? (UART_XMIT_SIZE - tail) : (head - tail); |
| 922 | if (xmit_count > 0) { |
| 923 | result = do_write(port, start, xmit_count); |
| 924 | if (result > 0) { |
| 925 | /* booking */ |
| 926 | xmit_count -= result; |
| 927 | the_port->icount.tx += result; |
| 928 | /* advance the pointers */ |
| 929 | tail += result; |
| 930 | tail &= UART_XMIT_SIZE - 1; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 931 | state->xmit.tail = tail; |
| 932 | start = (char *)&state->xmit.buf[tail]; |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 933 | } |
| 934 | } |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 935 | if (uart_circ_chars_pending(&state->xmit) < WAKEUP_CHARS) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 936 | uart_write_wakeup(the_port); |
| 937 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 938 | if (uart_circ_empty(&state->xmit)) { |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 939 | set_notification(port, N_OUTPUT_LOWAT, 0); |
| 940 | } else { |
| 941 | set_notification(port, N_OUTPUT_LOWAT, 1); |
| 942 | } |
| 943 | } |
| 944 | |
| 945 | /** |
| 946 | * ioc3_change_speed - change the speed of the port |
| 947 | * @the_port: port to change |
| 948 | * @new_termios: new termios settings |
| 949 | * @old_termios: old termios settings |
| 950 | */ |
| 951 | static void |
| 952 | ioc3_change_speed(struct uart_port *the_port, |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 953 | struct ktermios *new_termios, struct ktermios *old_termios) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 954 | { |
| 955 | struct ioc3_port *port = get_ioc3_port(the_port); |
| 956 | unsigned int cflag; |
| 957 | int baud; |
| 958 | int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 959 | struct uart_state *state = the_port->state; |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 960 | |
| 961 | cflag = new_termios->c_cflag; |
| 962 | |
| 963 | switch (cflag & CSIZE) { |
| 964 | case CS5: |
| 965 | new_data = 5; |
| 966 | break; |
| 967 | case CS6: |
| 968 | new_data = 6; |
| 969 | break; |
| 970 | case CS7: |
| 971 | new_data = 7; |
| 972 | break; |
| 973 | case CS8: |
| 974 | new_data = 8; |
| 975 | break; |
| 976 | default: |
| 977 | /* cuz we always need a default ... */ |
| 978 | new_data = 5; |
| 979 | break; |
| 980 | } |
| 981 | if (cflag & CSTOPB) { |
| 982 | new_stop = 1; |
| 983 | } |
| 984 | if (cflag & PARENB) { |
| 985 | new_parity_enable = 1; |
| 986 | if (cflag & PARODD) |
| 987 | new_parity = 1; |
| 988 | } |
| 989 | baud = uart_get_baud_rate(the_port, new_termios, old_termios, |
| 990 | MIN_BAUD_SUPPORTED, MAX_BAUD_SUPPORTED); |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 991 | DPRINT_CONFIG(("%s: returned baud %d for line %d\n", __func__, baud, |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 992 | the_port->line)); |
| 993 | |
| 994 | if (!the_port->fifosize) |
| 995 | the_port->fifosize = FIFO_SIZE; |
| 996 | uart_update_timeout(the_port, cflag, baud); |
| 997 | |
| 998 | the_port->ignore_status_mask = N_ALL_INPUT; |
| 999 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1000 | state->port.tty->low_latency = 1; |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1001 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1002 | if (I_IGNPAR(state->port.tty)) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1003 | the_port->ignore_status_mask &= ~(N_PARITY_ERROR |
| 1004 | | N_FRAMING_ERROR); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1005 | if (I_IGNBRK(state->port.tty)) { |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1006 | the_port->ignore_status_mask &= ~N_BREAK; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1007 | if (I_IGNPAR(state->port.tty)) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1008 | the_port->ignore_status_mask &= ~N_OVERRUN_ERROR; |
| 1009 | } |
| 1010 | if (!(cflag & CREAD)) { |
| 1011 | /* ignore everything */ |
| 1012 | the_port->ignore_status_mask &= ~N_DATA_READY; |
| 1013 | } |
| 1014 | |
| 1015 | if (cflag & CRTSCTS) { |
| 1016 | /* enable hardware flow control */ |
| 1017 | port->ip_sscr |= SSCR_HFC_EN; |
| 1018 | } |
| 1019 | else { |
| 1020 | /* disable hardware flow control */ |
| 1021 | port->ip_sscr &= ~SSCR_HFC_EN; |
| 1022 | } |
| 1023 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); |
| 1024 | |
| 1025 | /* Set the configuration and proper notification call */ |
| 1026 | DPRINT_CONFIG(("%s : port 0x%p line %d cflag 0%o " |
| 1027 | "config_port(baud %d data %d stop %d penable %d " |
| 1028 | " parity %d), notification 0x%x\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 1029 | __func__, (void *)port, the_port->line, cflag, baud, |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1030 | new_data, new_stop, new_parity_enable, new_parity, |
| 1031 | the_port->ignore_status_mask)); |
| 1032 | |
| 1033 | if ((config_port(port, baud, /* baud */ |
| 1034 | new_data, /* byte size */ |
| 1035 | new_stop, /* stop bits */ |
| 1036 | new_parity_enable, /* set parity */ |
| 1037 | new_parity)) >= 0) { /* parity 1==odd */ |
| 1038 | set_notification(port, the_port->ignore_status_mask, 1); |
| 1039 | } |
| 1040 | } |
| 1041 | |
| 1042 | /** |
| 1043 | * ic3_startup_local - Start up the serial port - returns >= 0 if no errors |
| 1044 | * @the_port: Port to operate on |
| 1045 | */ |
| 1046 | static inline int ic3_startup_local(struct uart_port *the_port) |
| 1047 | { |
| 1048 | struct ioc3_port *port; |
| 1049 | |
| 1050 | if (!the_port) { |
| 1051 | NOT_PROGRESS(); |
| 1052 | return -1; |
| 1053 | } |
| 1054 | |
| 1055 | port = get_ioc3_port(the_port); |
| 1056 | if (!port) { |
| 1057 | NOT_PROGRESS(); |
| 1058 | return -1; |
| 1059 | } |
| 1060 | |
| 1061 | local_open(port); |
| 1062 | |
| 1063 | /* set the protocol */ |
| 1064 | ioc3_set_proto(port, IS_RS232(the_port->line) ? PROTO_RS232 : |
| 1065 | PROTO_RS422); |
| 1066 | return 0; |
| 1067 | } |
| 1068 | |
| 1069 | /* |
| 1070 | * ioc3_cb_output_lowat - called when the output low water mark is hit |
| 1071 | * @port: port to output |
| 1072 | */ |
| 1073 | static void ioc3_cb_output_lowat(struct ioc3_port *port) |
| 1074 | { |
| 1075 | unsigned long pflags; |
| 1076 | |
| 1077 | /* the_port->lock is set on the call here */ |
| 1078 | if (port->ip_port) { |
| 1079 | spin_lock_irqsave(&port->ip_port->lock, pflags); |
| 1080 | transmit_chars(port->ip_port); |
| 1081 | spin_unlock_irqrestore(&port->ip_port->lock, pflags); |
| 1082 | } |
| 1083 | } |
| 1084 | |
| 1085 | /* |
| 1086 | * ioc3_cb_post_ncs - called for some basic errors |
| 1087 | * @port: port to use |
| 1088 | * @ncs: event |
| 1089 | */ |
| 1090 | static void ioc3_cb_post_ncs(struct uart_port *the_port, int ncs) |
| 1091 | { |
| 1092 | struct uart_icount *icount; |
| 1093 | |
| 1094 | icount = &the_port->icount; |
| 1095 | |
| 1096 | if (ncs & NCS_BREAK) |
| 1097 | icount->brk++; |
| 1098 | if (ncs & NCS_FRAMING) |
| 1099 | icount->frame++; |
| 1100 | if (ncs & NCS_OVERRUN) |
| 1101 | icount->overrun++; |
| 1102 | if (ncs & NCS_PARITY) |
| 1103 | icount->parity++; |
| 1104 | } |
| 1105 | |
| 1106 | /** |
| 1107 | * do_read - Read in bytes from the port. Return the number of bytes |
| 1108 | * actually read. |
| 1109 | * @the_port: port to use |
| 1110 | * @buf: place to put the stuff we read |
| 1111 | * @len: how big 'buf' is |
| 1112 | */ |
| 1113 | |
| 1114 | static inline int do_read(struct uart_port *the_port, char *buf, int len) |
| 1115 | { |
| 1116 | int prod_ptr, cons_ptr, total; |
| 1117 | struct ioc3_port *port = get_ioc3_port(the_port); |
| 1118 | struct ring *inring; |
| 1119 | struct ring_entry *entry; |
| 1120 | struct port_hooks *hooks = port->ip_hooks; |
| 1121 | int byte_num; |
| 1122 | char *sc; |
| 1123 | int loop_counter; |
| 1124 | |
| 1125 | BUG_ON(!(len >= 0)); |
| 1126 | BUG_ON(!port); |
| 1127 | |
| 1128 | /* There is a nasty timing issue in the IOC3. When the rx_timer |
| 1129 | * expires or the rx_high condition arises, we take an interrupt. |
| 1130 | * At some point while servicing the interrupt, we read bytes from |
| 1131 | * the ring buffer and re-arm the rx_timer. However the rx_timer is |
| 1132 | * not started until the first byte is received *after* it is armed, |
| 1133 | * and any bytes pending in the rx construction buffers are not drained |
| 1134 | * to memory until either there are 4 bytes available or the rx_timer |
| 1135 | * expires. This leads to a potential situation where data is left |
| 1136 | * in the construction buffers forever - 1 to 3 bytes were received |
| 1137 | * after the interrupt was generated but before the rx_timer was |
| 1138 | * re-armed. At that point as long as no subsequent bytes are received |
| 1139 | * the timer will never be started and the bytes will remain in the |
| 1140 | * construction buffer forever. The solution is to execute a DRAIN |
| 1141 | * command after rearming the timer. This way any bytes received before |
| 1142 | * the DRAIN will be drained to memory, and any bytes received after |
| 1143 | * the DRAIN will start the TIMER and be drained when it expires. |
| 1144 | * Luckily, this only needs to be done when the DMA buffer is empty |
| 1145 | * since there is no requirement that this function return all |
| 1146 | * available data as long as it returns some. |
| 1147 | */ |
| 1148 | /* Re-arm the timer */ |
| 1149 | |
| 1150 | writel(port->ip_rx_cons | SRCIR_ARM, &port->ip_serial_regs->srcir); |
| 1151 | |
| 1152 | prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK; |
| 1153 | cons_ptr = port->ip_rx_cons; |
| 1154 | |
| 1155 | if (prod_ptr == cons_ptr) { |
| 1156 | int reset_dma = 0; |
| 1157 | |
| 1158 | /* Input buffer appears empty, do a flush. */ |
| 1159 | |
| 1160 | /* DMA must be enabled for this to work. */ |
| 1161 | if (!(port->ip_sscr & SSCR_DMA_EN)) { |
| 1162 | port->ip_sscr |= SSCR_DMA_EN; |
| 1163 | reset_dma = 1; |
| 1164 | } |
| 1165 | |
| 1166 | /* Potential race condition: we must reload the srpir after |
| 1167 | * issuing the drain command, otherwise we could think the rx |
| 1168 | * buffer is empty, then take a very long interrupt, and when |
| 1169 | * we come back it's full and we wait forever for the drain to |
| 1170 | * complete. |
| 1171 | */ |
| 1172 | writel(port->ip_sscr | SSCR_RX_DRAIN, |
| 1173 | &port->ip_serial_regs->sscr); |
| 1174 | prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK; |
| 1175 | |
| 1176 | /* We must not wait for the DRAIN to complete unless there are |
| 1177 | * at least 8 bytes (2 ring entries) available to receive the |
| 1178 | * data otherwise the DRAIN will never complete and we'll |
| 1179 | * deadlock here. |
| 1180 | * In fact, to make things easier, I'll just ignore the flush if |
| 1181 | * there is any data at all now available. |
| 1182 | */ |
| 1183 | if (prod_ptr == cons_ptr) { |
| 1184 | loop_counter = 0; |
| 1185 | while (readl(&port->ip_serial_regs->sscr) & |
| 1186 | SSCR_RX_DRAIN) { |
| 1187 | loop_counter++; |
| 1188 | if (loop_counter > MAXITER) |
| 1189 | return -1; |
| 1190 | } |
| 1191 | |
| 1192 | /* SIGH. We have to reload the prod_ptr *again* since |
| 1193 | * the drain may have caused it to change |
| 1194 | */ |
| 1195 | prod_ptr = readl(&port->ip_serial_regs->srpir) |
| 1196 | & PROD_CONS_MASK; |
| 1197 | } |
| 1198 | if (reset_dma) { |
| 1199 | port->ip_sscr &= ~SSCR_DMA_EN; |
| 1200 | writel(port->ip_sscr, &port->ip_serial_regs->sscr); |
| 1201 | } |
| 1202 | } |
| 1203 | inring = port->ip_inring; |
| 1204 | port->ip_flags &= ~READ_ABORTED; |
| 1205 | |
| 1206 | total = 0; |
| 1207 | loop_counter = 0xfffff; /* to avoid hangs */ |
| 1208 | |
| 1209 | /* Grab bytes from the hardware */ |
| 1210 | while ((prod_ptr != cons_ptr) && (len > 0)) { |
| 1211 | entry = (struct ring_entry *)((caddr_t) inring + cons_ptr); |
| 1212 | |
| 1213 | if (loop_counter-- <= 0) { |
| 1214 | printk(KERN_WARNING "IOC3 serial: " |
| 1215 | "possible hang condition/" |
| 1216 | "port stuck on read (line %d).\n", |
| 1217 | the_port->line); |
| 1218 | break; |
| 1219 | } |
| 1220 | |
| 1221 | /* According to the producer pointer, this ring entry |
| 1222 | * must contain some data. But if the PIO happened faster |
| 1223 | * than the DMA, the data may not be available yet, so let's |
| 1224 | * wait until it arrives. |
| 1225 | */ |
| 1226 | if ((entry->ring_allsc & RING_ANY_VALID) == 0) { |
| 1227 | /* Indicate the read is aborted so we don't disable |
| 1228 | * the interrupt thinking that the consumer is |
| 1229 | * congested. |
| 1230 | */ |
| 1231 | port->ip_flags |= READ_ABORTED; |
| 1232 | len = 0; |
| 1233 | break; |
| 1234 | } |
| 1235 | |
| 1236 | /* Load the bytes/status out of the ring entry */ |
| 1237 | for (byte_num = 0; byte_num < 4 && len > 0; byte_num++) { |
| 1238 | sc = &(entry->ring_sc[byte_num]); |
| 1239 | |
| 1240 | /* Check for change in modem state or overrun */ |
| 1241 | if ((*sc & RXSB_MODEM_VALID) |
| 1242 | && (port->ip_notify & N_DDCD)) { |
| 1243 | /* Notify upper layer if DCD dropped */ |
| 1244 | if ((port->ip_flags & DCD_ON) |
| 1245 | && !(*sc & RXSB_DCD)) { |
| 1246 | /* If we have already copied some data, |
| 1247 | * return it. We'll pick up the carrier |
| 1248 | * drop on the next pass. That way we |
| 1249 | * don't throw away the data that has |
| 1250 | * already been copied back to |
| 1251 | * the caller's buffer. |
| 1252 | */ |
| 1253 | if (total > 0) { |
| 1254 | len = 0; |
| 1255 | break; |
| 1256 | } |
| 1257 | port->ip_flags &= ~DCD_ON; |
| 1258 | |
| 1259 | /* Turn off this notification so the |
| 1260 | * carrier drop protocol won't see it |
| 1261 | * again when it does a read. |
| 1262 | */ |
| 1263 | *sc &= ~RXSB_MODEM_VALID; |
| 1264 | |
| 1265 | /* To keep things consistent, we need |
| 1266 | * to update the consumer pointer so |
| 1267 | * the next reader won't come in and |
| 1268 | * try to read the same ring entries |
| 1269 | * again. This must be done here before |
| 1270 | * the dcd change. |
| 1271 | */ |
| 1272 | |
| 1273 | if ((entry->ring_allsc & RING_ANY_VALID) |
| 1274 | == 0) { |
| 1275 | cons_ptr += (int)sizeof |
| 1276 | (struct ring_entry); |
| 1277 | cons_ptr &= PROD_CONS_MASK; |
| 1278 | } |
| 1279 | writel(cons_ptr, |
| 1280 | &port->ip_serial_regs->srcir); |
| 1281 | port->ip_rx_cons = cons_ptr; |
| 1282 | |
| 1283 | /* Notify upper layer of carrier drop */ |
| 1284 | if ((port->ip_notify & N_DDCD) |
| 1285 | && port->ip_port) { |
| 1286 | uart_handle_dcd_change |
| 1287 | (port->ip_port, 0); |
| 1288 | wake_up_interruptible |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1289 | (&the_port->state-> |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1290 | port.delta_msr_wait); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1291 | } |
| 1292 | |
| 1293 | /* If we had any data to return, we |
| 1294 | * would have returned it above. |
| 1295 | */ |
| 1296 | return 0; |
| 1297 | } |
| 1298 | } |
| 1299 | if (*sc & RXSB_MODEM_VALID) { |
| 1300 | /* Notify that an input overrun occurred */ |
| 1301 | if ((*sc & RXSB_OVERRUN) |
| 1302 | && (port->ip_notify & N_OVERRUN_ERROR)) { |
| 1303 | ioc3_cb_post_ncs(the_port, NCS_OVERRUN); |
| 1304 | } |
| 1305 | /* Don't look at this byte again */ |
| 1306 | *sc &= ~RXSB_MODEM_VALID; |
| 1307 | } |
| 1308 | |
| 1309 | /* Check for valid data or RX errors */ |
| 1310 | if ((*sc & RXSB_DATA_VALID) && |
| 1311 | ((*sc & (RXSB_PAR_ERR |
| 1312 | | RXSB_FRAME_ERR | RXSB_BREAK)) |
| 1313 | && (port->ip_notify & (N_PARITY_ERROR |
| 1314 | | N_FRAMING_ERROR |
| 1315 | | N_BREAK)))) { |
| 1316 | /* There is an error condition on the next byte. |
| 1317 | * If we have already transferred some bytes, |
| 1318 | * we'll stop here. Otherwise if this is the |
| 1319 | * first byte to be read, we'll just transfer |
| 1320 | * it alone after notifying the |
| 1321 | * upper layer of its status. |
| 1322 | */ |
| 1323 | if (total > 0) { |
| 1324 | len = 0; |
| 1325 | break; |
| 1326 | } else { |
| 1327 | if ((*sc & RXSB_PAR_ERR) && |
| 1328 | (port-> |
| 1329 | ip_notify & N_PARITY_ERROR)) { |
| 1330 | ioc3_cb_post_ncs(the_port, |
| 1331 | NCS_PARITY); |
| 1332 | } |
| 1333 | if ((*sc & RXSB_FRAME_ERR) && |
| 1334 | (port-> |
| 1335 | ip_notify & N_FRAMING_ERROR)) { |
| 1336 | ioc3_cb_post_ncs(the_port, |
| 1337 | NCS_FRAMING); |
| 1338 | } |
| 1339 | if ((*sc & RXSB_BREAK) |
| 1340 | && (port->ip_notify & N_BREAK)) { |
| 1341 | ioc3_cb_post_ncs |
| 1342 | (the_port, NCS_BREAK); |
| 1343 | } |
| 1344 | len = 1; |
| 1345 | } |
| 1346 | } |
| 1347 | if (*sc & RXSB_DATA_VALID) { |
| 1348 | *sc &= ~RXSB_DATA_VALID; |
| 1349 | *buf = entry->ring_data[byte_num]; |
| 1350 | buf++; |
| 1351 | len--; |
| 1352 | total++; |
| 1353 | } |
| 1354 | } |
| 1355 | |
| 1356 | /* If we used up this entry entirely, go on to the next one, |
| 1357 | * otherwise we must have run out of buffer space, so |
| 1358 | * leave the consumer pointer here for the next read in case |
| 1359 | * there are still unread bytes in this entry. |
| 1360 | */ |
| 1361 | if ((entry->ring_allsc & RING_ANY_VALID) == 0) { |
| 1362 | cons_ptr += (int)sizeof(struct ring_entry); |
| 1363 | cons_ptr &= PROD_CONS_MASK; |
| 1364 | } |
| 1365 | } |
| 1366 | |
| 1367 | /* Update consumer pointer and re-arm rx timer interrupt */ |
| 1368 | writel(cons_ptr, &port->ip_serial_regs->srcir); |
| 1369 | port->ip_rx_cons = cons_ptr; |
| 1370 | |
| 1371 | /* If we have now dipped below the rx high water mark and we have |
| 1372 | * rx_high interrupt turned off, we can now turn it back on again. |
| 1373 | */ |
| 1374 | if ((port->ip_flags & INPUT_HIGH) && (((prod_ptr - cons_ptr) |
| 1375 | & PROD_CONS_MASK) < |
| 1376 | ((port-> |
| 1377 | ip_sscr & |
| 1378 | SSCR_RX_THRESHOLD) |
| 1379 | << PROD_CONS_PTR_OFF))) { |
| 1380 | port->ip_flags &= ~INPUT_HIGH; |
| 1381 | enable_intrs(port, hooks->intr_rx_high); |
| 1382 | } |
| 1383 | return total; |
| 1384 | } |
| 1385 | |
| 1386 | /** |
| 1387 | * receive_chars - upper level read. |
| 1388 | * @the_port: port to read from |
| 1389 | */ |
| 1390 | static int receive_chars(struct uart_port *the_port) |
| 1391 | { |
| 1392 | struct tty_struct *tty; |
| 1393 | unsigned char ch[MAX_CHARS]; |
| 1394 | int read_count = 0, read_room, flip = 0; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1395 | struct uart_state *state = the_port->state; |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1396 | struct ioc3_port *port = get_ioc3_port(the_port); |
| 1397 | unsigned long pflags; |
| 1398 | |
| 1399 | /* Make sure all the pointers are "good" ones */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1400 | if (!state) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1401 | return 0; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1402 | if (!state->port.tty) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1403 | return 0; |
| 1404 | |
| 1405 | if (!(port->ip_flags & INPUT_ENABLE)) |
| 1406 | return 0; |
| 1407 | |
| 1408 | spin_lock_irqsave(&the_port->lock, pflags); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1409 | tty = state->port.tty; |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1410 | |
| 1411 | read_count = do_read(the_port, ch, MAX_CHARS); |
| 1412 | if (read_count > 0) { |
| 1413 | flip = 1; |
Alan Cox | 4165fe4 | 2010-02-17 13:07:13 +0000 | [diff] [blame] | 1414 | read_room = tty_insert_flip_string(tty, ch, read_count); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1415 | the_port->icount.rx += read_count; |
| 1416 | } |
| 1417 | spin_unlock_irqrestore(&the_port->lock, pflags); |
| 1418 | |
| 1419 | if (flip) |
| 1420 | tty_flip_buffer_push(tty); |
| 1421 | |
| 1422 | return read_count; |
| 1423 | } |
| 1424 | |
| 1425 | /** |
| 1426 | * ioc3uart_intr_one - lowest level (per port) interrupt handler. |
| 1427 | * @is : submodule |
| 1428 | * @idd: driver data |
| 1429 | * @pending: interrupts to handle |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1430 | */ |
| 1431 | |
| 1432 | static int inline |
| 1433 | ioc3uart_intr_one(struct ioc3_submodule *is, |
| 1434 | struct ioc3_driver_data *idd, |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1435 | unsigned int pending) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1436 | { |
| 1437 | int port_num = GET_PORT_FROM_SIO_IR(pending); |
| 1438 | struct port_hooks *hooks; |
| 1439 | unsigned int rx_high_rd_aborted = 0; |
| 1440 | unsigned long flags; |
| 1441 | struct uart_port *the_port; |
| 1442 | struct ioc3_port *port; |
| 1443 | int loop_counter; |
| 1444 | struct ioc3_card *card_ptr; |
| 1445 | unsigned int sio_ir; |
| 1446 | |
| 1447 | card_ptr = idd->data[is->id]; |
| 1448 | port = card_ptr->ic_port[port_num].icp_port; |
| 1449 | hooks = port->ip_hooks; |
| 1450 | |
| 1451 | /* Possible race condition here: The tx_mt interrupt bit may be |
| 1452 | * cleared without the intervention of the interrupt handler, |
| 1453 | * e.g. by a write. If the top level interrupt handler reads a |
| 1454 | * tx_mt, then some other processor does a write, starting up |
| 1455 | * output, then we come in here, see the tx_mt and stop DMA, the |
| 1456 | * output started by the other processor will hang. Thus we can |
| 1457 | * only rely on tx_mt being legitimate if it is read while the |
| 1458 | * port lock is held. Therefore this bit must be ignored in the |
| 1459 | * passed in interrupt mask which was read by the top level |
| 1460 | * interrupt handler since the port lock was not held at the time |
| 1461 | * it was read. We can only rely on this bit being accurate if it |
| 1462 | * is read while the port lock is held. So we'll clear it for now, |
| 1463 | * and reload it later once we have the port lock. |
| 1464 | */ |
| 1465 | |
| 1466 | sio_ir = pending & ~(hooks->intr_tx_mt); |
| 1467 | spin_lock_irqsave(&port->ip_lock, flags); |
| 1468 | |
| 1469 | loop_counter = MAXITER; /* to avoid hangs */ |
| 1470 | |
| 1471 | do { |
| 1472 | uint32_t shadow; |
| 1473 | |
| 1474 | if (loop_counter-- <= 0) { |
| 1475 | printk(KERN_WARNING "IOC3 serial: " |
| 1476 | "possible hang condition/" |
| 1477 | "port stuck on interrupt (line %d).\n", |
| 1478 | ((struct uart_port *)port->ip_port)->line); |
| 1479 | break; |
| 1480 | } |
| 1481 | /* Handle a DCD change */ |
| 1482 | if (sio_ir & hooks->intr_delta_dcd) { |
| 1483 | ioc3_ack(is, idd, hooks->intr_delta_dcd); |
| 1484 | shadow = readl(&port->ip_serial_regs->shadow); |
| 1485 | |
| 1486 | if ((port->ip_notify & N_DDCD) |
| 1487 | && (shadow & SHADOW_DCD) |
| 1488 | && (port->ip_port)) { |
| 1489 | the_port = port->ip_port; |
| 1490 | uart_handle_dcd_change(the_port, |
| 1491 | shadow & SHADOW_DCD); |
| 1492 | wake_up_interruptible |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1493 | (&the_port->state->port.delta_msr_wait); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1494 | } else if ((port->ip_notify & N_DDCD) |
| 1495 | && !(shadow & SHADOW_DCD)) { |
| 1496 | /* Flag delta DCD/no DCD */ |
| 1497 | uart_handle_dcd_change(port->ip_port, |
| 1498 | shadow & SHADOW_DCD); |
| 1499 | port->ip_flags |= DCD_ON; |
| 1500 | } |
| 1501 | } |
| 1502 | |
| 1503 | /* Handle a CTS change */ |
| 1504 | if (sio_ir & hooks->intr_delta_cts) { |
| 1505 | ioc3_ack(is, idd, hooks->intr_delta_cts); |
| 1506 | shadow = readl(&port->ip_serial_regs->shadow); |
| 1507 | |
| 1508 | if ((port->ip_notify & N_DCTS) && (port->ip_port)) { |
| 1509 | the_port = port->ip_port; |
| 1510 | uart_handle_cts_change(the_port, shadow |
| 1511 | & SHADOW_CTS); |
| 1512 | wake_up_interruptible |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1513 | (&the_port->state->port.delta_msr_wait); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1514 | } |
| 1515 | } |
| 1516 | |
| 1517 | /* rx timeout interrupt. Must be some data available. Put this |
| 1518 | * before the check for rx_high since servicing this condition |
| 1519 | * may cause that condition to clear. |
| 1520 | */ |
| 1521 | if (sio_ir & hooks->intr_rx_timer) { |
| 1522 | ioc3_ack(is, idd, hooks->intr_rx_timer); |
| 1523 | if ((port->ip_notify & N_DATA_READY) |
| 1524 | && (port->ip_port)) { |
| 1525 | receive_chars(port->ip_port); |
| 1526 | } |
| 1527 | } |
| 1528 | |
| 1529 | /* rx high interrupt. Must be after rx_timer. */ |
| 1530 | else if (sio_ir & hooks->intr_rx_high) { |
| 1531 | /* Data available, notify upper layer */ |
| 1532 | if ((port->ip_notify & N_DATA_READY) && port->ip_port) { |
| 1533 | receive_chars(port->ip_port); |
| 1534 | } |
| 1535 | |
| 1536 | /* We can't ACK this interrupt. If receive_chars didn't |
| 1537 | * cause the condition to clear, we'll have to disable |
| 1538 | * the interrupt until the data is drained. |
| 1539 | * If the read was aborted, don't disable the interrupt |
| 1540 | * as this may cause us to hang indefinitely. An |
| 1541 | * aborted read generally means that this interrupt |
| 1542 | * hasn't been delivered to the cpu yet anyway, even |
| 1543 | * though we see it as asserted when we read the sio_ir. |
| 1544 | */ |
| 1545 | if ((sio_ir = PENDING(card_ptr, idd)) |
| 1546 | & hooks->intr_rx_high) { |
| 1547 | if (port->ip_flags & READ_ABORTED) { |
| 1548 | rx_high_rd_aborted++; |
| 1549 | } |
| 1550 | else { |
| 1551 | card_ptr->ic_enable &= ~hooks->intr_rx_high; |
| 1552 | port->ip_flags |= INPUT_HIGH; |
| 1553 | } |
| 1554 | } |
| 1555 | } |
| 1556 | |
| 1557 | /* We got a low water interrupt: notify upper layer to |
| 1558 | * send more data. Must come before tx_mt since servicing |
| 1559 | * this condition may cause that condition to clear. |
| 1560 | */ |
| 1561 | if (sio_ir & hooks->intr_tx_explicit) { |
| 1562 | port->ip_flags &= ~LOWAT_WRITTEN; |
| 1563 | ioc3_ack(is, idd, hooks->intr_tx_explicit); |
| 1564 | if (port->ip_notify & N_OUTPUT_LOWAT) |
| 1565 | ioc3_cb_output_lowat(port); |
| 1566 | } |
| 1567 | |
| 1568 | /* Handle tx_mt. Must come after tx_explicit. */ |
| 1569 | else if (sio_ir & hooks->intr_tx_mt) { |
| 1570 | /* If we are expecting a lowat notification |
| 1571 | * and we get to this point it probably means that for |
| 1572 | * some reason the tx_explicit didn't work as expected |
| 1573 | * (that can legitimately happen if the output buffer is |
| 1574 | * filled up in just the right way). |
| 1575 | * So send the notification now. |
| 1576 | */ |
| 1577 | if (port->ip_notify & N_OUTPUT_LOWAT) { |
| 1578 | ioc3_cb_output_lowat(port); |
| 1579 | |
| 1580 | /* We need to reload the sio_ir since the lowat |
| 1581 | * call may have caused another write to occur, |
| 1582 | * clearing the tx_mt condition. |
| 1583 | */ |
| 1584 | sio_ir = PENDING(card_ptr, idd); |
| 1585 | } |
| 1586 | |
| 1587 | /* If the tx_mt condition still persists even after the |
| 1588 | * lowat call, we've got some work to do. |
| 1589 | */ |
| 1590 | if (sio_ir & hooks->intr_tx_mt) { |
| 1591 | /* If we are not currently expecting DMA input, |
| 1592 | * and the transmitter has just gone idle, |
| 1593 | * there is no longer any reason for DMA, so |
| 1594 | * disable it. |
| 1595 | */ |
| 1596 | if (!(port->ip_notify |
| 1597 | & (N_DATA_READY | N_DDCD))) { |
| 1598 | BUG_ON(!(port->ip_sscr |
| 1599 | & SSCR_DMA_EN)); |
| 1600 | port->ip_sscr &= ~SSCR_DMA_EN; |
| 1601 | writel(port->ip_sscr, |
| 1602 | &port->ip_serial_regs->sscr); |
| 1603 | } |
| 1604 | /* Prevent infinite tx_mt interrupt */ |
| 1605 | card_ptr->ic_enable &= ~hooks->intr_tx_mt; |
| 1606 | } |
| 1607 | } |
| 1608 | sio_ir = PENDING(card_ptr, idd); |
| 1609 | |
| 1610 | /* if the read was aborted and only hooks->intr_rx_high, |
| 1611 | * clear hooks->intr_rx_high, so we do not loop forever. |
| 1612 | */ |
| 1613 | |
| 1614 | if (rx_high_rd_aborted && (sio_ir == hooks->intr_rx_high)) { |
| 1615 | sio_ir &= ~hooks->intr_rx_high; |
| 1616 | } |
| 1617 | } while (sio_ir & hooks->intr_all); |
| 1618 | |
| 1619 | spin_unlock_irqrestore(&port->ip_lock, flags); |
| 1620 | ioc3_enable(is, idd, card_ptr->ic_enable); |
| 1621 | return 0; |
| 1622 | } |
| 1623 | |
| 1624 | /** |
| 1625 | * ioc3uart_intr - field all serial interrupts |
| 1626 | * @is : submodule |
| 1627 | * @idd: driver data |
| 1628 | * @pending: interrupts to handle |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1629 | * |
| 1630 | */ |
| 1631 | |
| 1632 | static int ioc3uart_intr(struct ioc3_submodule *is, |
| 1633 | struct ioc3_driver_data *idd, |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1634 | unsigned int pending) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1635 | { |
| 1636 | int ret = 0; |
| 1637 | |
| 1638 | /* |
| 1639 | * The upper level interrupt handler sends interrupts for both ports |
| 1640 | * here. So we need to call for each port with its interrupts. |
| 1641 | */ |
| 1642 | |
| 1643 | if (pending & SIO_IR_SA) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1644 | ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SA); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1645 | if (pending & SIO_IR_SB) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1646 | ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SB); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1647 | |
| 1648 | return ret; |
| 1649 | } |
| 1650 | |
| 1651 | /** |
| 1652 | * ic3_type |
| 1653 | * @port: Port to operate with (we ignore since we only have one port) |
| 1654 | * |
| 1655 | */ |
| 1656 | static const char *ic3_type(struct uart_port *the_port) |
| 1657 | { |
| 1658 | if (IS_RS232(the_port->line)) |
| 1659 | return "SGI IOC3 Serial [rs232]"; |
| 1660 | else |
| 1661 | return "SGI IOC3 Serial [rs422]"; |
| 1662 | } |
| 1663 | |
| 1664 | /** |
| 1665 | * ic3_tx_empty - Is the transmitter empty? |
| 1666 | * @port: Port to operate on |
| 1667 | * |
| 1668 | */ |
| 1669 | static unsigned int ic3_tx_empty(struct uart_port *the_port) |
| 1670 | { |
| 1671 | unsigned int ret = 0; |
| 1672 | struct ioc3_port *port = get_ioc3_port(the_port); |
| 1673 | |
| 1674 | if (readl(&port->ip_serial_regs->shadow) & SHADOW_TEMT) |
| 1675 | ret = TIOCSER_TEMT; |
| 1676 | return ret; |
| 1677 | } |
| 1678 | |
| 1679 | /** |
| 1680 | * ic3_stop_tx - stop the transmitter |
| 1681 | * @port: Port to operate on |
| 1682 | * |
| 1683 | */ |
| 1684 | static void ic3_stop_tx(struct uart_port *the_port) |
| 1685 | { |
| 1686 | struct ioc3_port *port = get_ioc3_port(the_port); |
| 1687 | |
| 1688 | if (port) |
| 1689 | set_notification(port, N_OUTPUT_LOWAT, 0); |
| 1690 | } |
| 1691 | |
| 1692 | /** |
| 1693 | * ic3_stop_rx - stop the receiver |
| 1694 | * @port: Port to operate on |
| 1695 | * |
| 1696 | */ |
| 1697 | static void ic3_stop_rx(struct uart_port *the_port) |
| 1698 | { |
| 1699 | struct ioc3_port *port = get_ioc3_port(the_port); |
| 1700 | |
| 1701 | if (port) |
| 1702 | port->ip_flags &= ~INPUT_ENABLE; |
| 1703 | } |
| 1704 | |
| 1705 | /** |
| 1706 | * null_void_function |
| 1707 | * @port: Port to operate on |
| 1708 | * |
| 1709 | */ |
| 1710 | static void null_void_function(struct uart_port *the_port) |
| 1711 | { |
| 1712 | } |
| 1713 | |
| 1714 | /** |
| 1715 | * ic3_shutdown - shut down the port - free irq and disable |
| 1716 | * @port: port to shut down |
| 1717 | * |
| 1718 | */ |
| 1719 | static void ic3_shutdown(struct uart_port *the_port) |
| 1720 | { |
| 1721 | unsigned long port_flags; |
| 1722 | struct ioc3_port *port; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1723 | struct uart_state *state; |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1724 | |
| 1725 | port = get_ioc3_port(the_port); |
| 1726 | if (!port) |
| 1727 | return; |
| 1728 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1729 | state = the_port->state; |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1730 | wake_up_interruptible(&state->port.delta_msr_wait); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1731 | |
| 1732 | spin_lock_irqsave(&the_port->lock, port_flags); |
| 1733 | set_notification(port, N_ALL, 0); |
| 1734 | spin_unlock_irqrestore(&the_port->lock, port_flags); |
| 1735 | } |
| 1736 | |
| 1737 | /** |
| 1738 | * ic3_set_mctrl - set control lines (dtr, rts, etc) |
| 1739 | * @port: Port to operate on |
| 1740 | * @mctrl: Lines to set/unset |
| 1741 | * |
| 1742 | */ |
| 1743 | static void ic3_set_mctrl(struct uart_port *the_port, unsigned int mctrl) |
| 1744 | { |
| 1745 | unsigned char mcr = 0; |
| 1746 | |
| 1747 | if (mctrl & TIOCM_RTS) |
| 1748 | mcr |= UART_MCR_RTS; |
| 1749 | if (mctrl & TIOCM_DTR) |
| 1750 | mcr |= UART_MCR_DTR; |
| 1751 | if (mctrl & TIOCM_OUT1) |
| 1752 | mcr |= UART_MCR_OUT1; |
| 1753 | if (mctrl & TIOCM_OUT2) |
| 1754 | mcr |= UART_MCR_OUT2; |
| 1755 | if (mctrl & TIOCM_LOOP) |
| 1756 | mcr |= UART_MCR_LOOP; |
| 1757 | |
| 1758 | set_mcr(the_port, mcr, SHADOW_DTR); |
| 1759 | } |
| 1760 | |
| 1761 | /** |
| 1762 | * ic3_get_mctrl - get control line info |
| 1763 | * @port: port to operate on |
| 1764 | * |
| 1765 | */ |
| 1766 | static unsigned int ic3_get_mctrl(struct uart_port *the_port) |
| 1767 | { |
| 1768 | struct ioc3_port *port = get_ioc3_port(the_port); |
| 1769 | uint32_t shadow; |
| 1770 | unsigned int ret = 0; |
| 1771 | |
| 1772 | if (!port) |
| 1773 | return 0; |
| 1774 | |
| 1775 | shadow = readl(&port->ip_serial_regs->shadow); |
| 1776 | if (shadow & SHADOW_DCD) |
| 1777 | ret |= TIOCM_CD; |
| 1778 | if (shadow & SHADOW_DR) |
| 1779 | ret |= TIOCM_DSR; |
| 1780 | if (shadow & SHADOW_CTS) |
| 1781 | ret |= TIOCM_CTS; |
| 1782 | return ret; |
| 1783 | } |
| 1784 | |
| 1785 | /** |
| 1786 | * ic3_start_tx - Start transmitter. Called with the_port->lock |
| 1787 | * @port: Port to operate on |
| 1788 | * |
| 1789 | */ |
| 1790 | static void ic3_start_tx(struct uart_port *the_port) |
| 1791 | { |
| 1792 | struct ioc3_port *port = get_ioc3_port(the_port); |
| 1793 | |
| 1794 | if (port) { |
| 1795 | set_notification(port, N_OUTPUT_LOWAT, 1); |
| 1796 | enable_intrs(port, port->ip_hooks->intr_tx_mt); |
| 1797 | } |
| 1798 | } |
| 1799 | |
| 1800 | /** |
| 1801 | * ic3_break_ctl - handle breaks |
| 1802 | * @port: Port to operate on |
| 1803 | * @break_state: Break state |
| 1804 | * |
| 1805 | */ |
| 1806 | static void ic3_break_ctl(struct uart_port *the_port, int break_state) |
| 1807 | { |
| 1808 | } |
| 1809 | |
| 1810 | /** |
| 1811 | * ic3_startup - Start up the serial port - always return 0 (We're always on) |
| 1812 | * @port: Port to operate on |
| 1813 | * |
| 1814 | */ |
| 1815 | static int ic3_startup(struct uart_port *the_port) |
| 1816 | { |
| 1817 | int retval; |
| 1818 | struct ioc3_port *port; |
| 1819 | struct ioc3_card *card_ptr; |
| 1820 | unsigned long port_flags; |
| 1821 | |
| 1822 | if (!the_port) { |
| 1823 | NOT_PROGRESS(); |
| 1824 | return -ENODEV; |
| 1825 | } |
| 1826 | port = get_ioc3_port(the_port); |
| 1827 | if (!port) { |
| 1828 | NOT_PROGRESS(); |
| 1829 | return -ENODEV; |
| 1830 | } |
| 1831 | card_ptr = port->ip_card; |
| 1832 | port->ip_port = the_port; |
| 1833 | |
| 1834 | if (!card_ptr) { |
| 1835 | NOT_PROGRESS(); |
| 1836 | return -ENODEV; |
| 1837 | } |
| 1838 | |
| 1839 | /* Start up the serial port */ |
| 1840 | spin_lock_irqsave(&the_port->lock, port_flags); |
| 1841 | retval = ic3_startup_local(the_port); |
| 1842 | spin_unlock_irqrestore(&the_port->lock, port_flags); |
| 1843 | return retval; |
| 1844 | } |
| 1845 | |
| 1846 | /** |
| 1847 | * ic3_set_termios - set termios stuff |
| 1848 | * @port: port to operate on |
| 1849 | * @termios: New settings |
| 1850 | * @termios: Old |
| 1851 | * |
| 1852 | */ |
| 1853 | static void |
| 1854 | ic3_set_termios(struct uart_port *the_port, |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1855 | struct ktermios *termios, struct ktermios *old_termios) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1856 | { |
| 1857 | unsigned long port_flags; |
| 1858 | |
| 1859 | spin_lock_irqsave(&the_port->lock, port_flags); |
| 1860 | ioc3_change_speed(the_port, termios, old_termios); |
| 1861 | spin_unlock_irqrestore(&the_port->lock, port_flags); |
| 1862 | } |
| 1863 | |
| 1864 | /** |
| 1865 | * ic3_request_port - allocate resources for port - no op.... |
| 1866 | * @port: port to operate on |
| 1867 | * |
| 1868 | */ |
| 1869 | static int ic3_request_port(struct uart_port *port) |
| 1870 | { |
| 1871 | return 0; |
| 1872 | } |
| 1873 | |
| 1874 | /* Associate the uart functions above - given to serial core */ |
| 1875 | static struct uart_ops ioc3_ops = { |
| 1876 | .tx_empty = ic3_tx_empty, |
| 1877 | .set_mctrl = ic3_set_mctrl, |
| 1878 | .get_mctrl = ic3_get_mctrl, |
| 1879 | .stop_tx = ic3_stop_tx, |
| 1880 | .start_tx = ic3_start_tx, |
| 1881 | .stop_rx = ic3_stop_rx, |
| 1882 | .enable_ms = null_void_function, |
| 1883 | .break_ctl = ic3_break_ctl, |
| 1884 | .startup = ic3_startup, |
| 1885 | .shutdown = ic3_shutdown, |
| 1886 | .set_termios = ic3_set_termios, |
| 1887 | .type = ic3_type, |
| 1888 | .release_port = null_void_function, |
| 1889 | .request_port = ic3_request_port, |
| 1890 | }; |
| 1891 | |
| 1892 | /* |
| 1893 | * Boot-time initialization code |
| 1894 | */ |
| 1895 | |
| 1896 | static struct uart_driver ioc3_uart = { |
| 1897 | .owner = THIS_MODULE, |
| 1898 | .driver_name = "ioc3_serial", |
| 1899 | .dev_name = DEVICE_NAME, |
| 1900 | .major = DEVICE_MAJOR, |
| 1901 | .minor = DEVICE_MINOR, |
| 1902 | .nr = MAX_LOGICAL_PORTS |
| 1903 | }; |
| 1904 | |
| 1905 | /** |
| 1906 | * ioc3_serial_core_attach - register with serial core |
| 1907 | * This is done during pci probing |
| 1908 | * @is: submodule struct for this |
| 1909 | * @idd: handle for this card |
| 1910 | */ |
| 1911 | static inline int ioc3_serial_core_attach( struct ioc3_submodule *is, |
| 1912 | struct ioc3_driver_data *idd) |
| 1913 | { |
| 1914 | struct ioc3_port *port; |
| 1915 | struct uart_port *the_port; |
| 1916 | struct ioc3_card *card_ptr = idd->data[is->id]; |
| 1917 | int ii, phys_port; |
| 1918 | struct pci_dev *pdev = idd->pdev; |
| 1919 | |
| 1920 | DPRINT_CONFIG(("%s: attach pdev 0x%p - card_ptr 0x%p\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 1921 | __func__, pdev, (void *)card_ptr)); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1922 | |
| 1923 | if (!card_ptr) |
| 1924 | return -ENODEV; |
| 1925 | |
| 1926 | /* once around for each logical port on this card */ |
| 1927 | for (ii = 0; ii < LOGICAL_PORTS_PER_CARD; ii++) { |
| 1928 | phys_port = GET_PHYSICAL_PORT(ii); |
| 1929 | the_port = &card_ptr->ic_port[phys_port]. |
| 1930 | icp_uart_port[GET_LOGICAL_PORT(ii)]; |
| 1931 | port = card_ptr->ic_port[phys_port].icp_port; |
| 1932 | port->ip_port = the_port; |
| 1933 | |
| 1934 | DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p [%d/%d]\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 1935 | __func__, (void *)the_port, (void *)port, |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1936 | phys_port, ii)); |
| 1937 | |
| 1938 | /* membase, iobase and mapbase just need to be non-0 */ |
| 1939 | the_port->membase = (unsigned char __iomem *)1; |
| 1940 | the_port->iobase = (pdev->bus->number << 16) | ii; |
| 1941 | the_port->line = (Num_of_ioc3_cards << 2) | ii; |
| 1942 | the_port->mapbase = 1; |
| 1943 | the_port->type = PORT_16550A; |
| 1944 | the_port->fifosize = FIFO_SIZE; |
| 1945 | the_port->ops = &ioc3_ops; |
| 1946 | the_port->irq = idd->irq_io; |
| 1947 | the_port->dev = &pdev->dev; |
| 1948 | |
| 1949 | if (uart_add_one_port(&ioc3_uart, the_port) < 0) { |
| 1950 | printk(KERN_WARNING |
| 1951 | "%s: unable to add port %d bus %d\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 1952 | __func__, the_port->line, pdev->bus->number); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 1953 | } else { |
| 1954 | DPRINT_CONFIG(("IOC3 serial port %d irq %d bus %d\n", |
| 1955 | the_port->line, the_port->irq, pdev->bus->number)); |
| 1956 | } |
| 1957 | |
| 1958 | /* all ports are rs232 for now */ |
| 1959 | if (IS_PHYSICAL_PORT(ii)) |
| 1960 | ioc3_set_proto(port, PROTO_RS232); |
| 1961 | } |
| 1962 | return 0; |
| 1963 | } |
| 1964 | |
| 1965 | /** |
| 1966 | * ioc3uart_remove - register detach function |
| 1967 | * @is: submodule struct for this submodule |
| 1968 | * @idd: ioc3 driver data for this submodule |
| 1969 | */ |
| 1970 | |
| 1971 | static int ioc3uart_remove(struct ioc3_submodule *is, |
| 1972 | struct ioc3_driver_data *idd) |
| 1973 | { |
| 1974 | struct ioc3_card *card_ptr = idd->data[is->id]; |
| 1975 | struct uart_port *the_port; |
| 1976 | struct ioc3_port *port; |
| 1977 | int ii; |
| 1978 | |
| 1979 | if (card_ptr) { |
| 1980 | for (ii = 0; ii < LOGICAL_PORTS_PER_CARD; ii++) { |
| 1981 | the_port = &card_ptr->ic_port[GET_PHYSICAL_PORT(ii)]. |
| 1982 | icp_uart_port[GET_LOGICAL_PORT(ii)]; |
| 1983 | if (the_port) |
| 1984 | uart_remove_one_port(&ioc3_uart, the_port); |
| 1985 | port = card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].icp_port; |
| 1986 | if (port && IS_PHYSICAL_PORT(ii) |
| 1987 | && (GET_PHYSICAL_PORT(ii) == 0)) { |
| 1988 | pci_free_consistent(port->ip_idd->pdev, |
| 1989 | TOTAL_RING_BUF_SIZE, |
| 1990 | (void *)port->ip_cpu_ringbuf, |
| 1991 | port->ip_dma_ringbuf); |
| 1992 | kfree(port); |
| 1993 | card_ptr->ic_port[GET_PHYSICAL_PORT(ii)]. |
| 1994 | icp_port = NULL; |
| 1995 | } |
| 1996 | } |
| 1997 | kfree(card_ptr); |
| 1998 | idd->data[is->id] = NULL; |
| 1999 | } |
| 2000 | return 0; |
| 2001 | } |
| 2002 | |
| 2003 | /** |
| 2004 | * ioc3uart_probe - card probe function called from shim driver |
| 2005 | * @is: submodule struct for this submodule |
| 2006 | * @idd: ioc3 driver data for this card |
| 2007 | */ |
| 2008 | |
| 2009 | static int __devinit |
| 2010 | ioc3uart_probe(struct ioc3_submodule *is, struct ioc3_driver_data *idd) |
| 2011 | { |
| 2012 | struct pci_dev *pdev = idd->pdev; |
| 2013 | struct ioc3_card *card_ptr; |
| 2014 | int ret = 0; |
| 2015 | struct ioc3_port *port; |
| 2016 | struct ioc3_port *ports[PORTS_PER_CARD]; |
| 2017 | int phys_port; |
| 2018 | |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 2019 | DPRINT_CONFIG(("%s (0x%p, 0x%p)\n", __func__, is, idd)); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2020 | |
Burman Yan | 8f31bb3 | 2007-02-14 00:33:07 -0800 | [diff] [blame] | 2021 | card_ptr = kzalloc(sizeof(struct ioc3_card), GFP_KERNEL); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2022 | if (!card_ptr) { |
| 2023 | printk(KERN_WARNING "ioc3_attach_one" |
| 2024 | ": unable to get memory for the IOC3\n"); |
| 2025 | return -ENOMEM; |
| 2026 | } |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2027 | idd->data[is->id] = card_ptr; |
| 2028 | Submodule_slot = is->id; |
| 2029 | |
| 2030 | writel(((UARTA_BASE >> 3) << SIO_CR_SER_A_BASE_SHIFT) | |
| 2031 | ((UARTB_BASE >> 3) << SIO_CR_SER_B_BASE_SHIFT) | |
| 2032 | (0xf << SIO_CR_CMD_PULSE_SHIFT), &idd->vma->sio_cr); |
| 2033 | |
| 2034 | pci_write_config_dword(pdev, PCI_LAT, 0xff00); |
| 2035 | |
| 2036 | /* Enable serial port mode select generic PIO pins as outputs */ |
| 2037 | ioc3_gpcr_set(idd, GPCR_UARTA_MODESEL | GPCR_UARTB_MODESEL); |
| 2038 | |
| 2039 | /* Create port structures for each port */ |
| 2040 | for (phys_port = 0; phys_port < PORTS_PER_CARD; phys_port++) { |
Burman Yan | 8f31bb3 | 2007-02-14 00:33:07 -0800 | [diff] [blame] | 2041 | port = kzalloc(sizeof(struct ioc3_port), GFP_KERNEL); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2042 | if (!port) { |
| 2043 | printk(KERN_WARNING |
| 2044 | "IOC3 serial memory not available for port\n"); |
| 2045 | goto out4; |
| 2046 | } |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2047 | spin_lock_init(&port->ip_lock); |
| 2048 | |
| 2049 | /* we need to remember the previous ones, to point back to |
| 2050 | * them farther down - setting up the ring buffers. |
| 2051 | */ |
| 2052 | ports[phys_port] = port; |
| 2053 | |
| 2054 | /* init to something useful */ |
| 2055 | card_ptr->ic_port[phys_port].icp_port = port; |
| 2056 | port->ip_is = is; |
| 2057 | port->ip_idd = idd; |
| 2058 | port->ip_baud = 9600; |
| 2059 | port->ip_card = card_ptr; |
| 2060 | port->ip_hooks = &hooks_array[phys_port]; |
| 2061 | |
| 2062 | /* Setup each port */ |
| 2063 | if (phys_port == 0) { |
| 2064 | port->ip_serial_regs = &idd->vma->port_a; |
| 2065 | port->ip_uart_regs = &idd->vma->sregs.uarta; |
| 2066 | |
| 2067 | DPRINT_CONFIG(("%s : Port A ip_serial_regs 0x%p " |
| 2068 | "ip_uart_regs 0x%p\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 2069 | __func__, |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2070 | (void *)port->ip_serial_regs, |
| 2071 | (void *)port->ip_uart_regs)); |
| 2072 | |
| 2073 | /* setup ring buffers */ |
| 2074 | port->ip_cpu_ringbuf = pci_alloc_consistent(pdev, |
| 2075 | TOTAL_RING_BUF_SIZE, &port->ip_dma_ringbuf); |
| 2076 | |
| 2077 | BUG_ON(!((((int64_t) port->ip_dma_ringbuf) & |
| 2078 | (TOTAL_RING_BUF_SIZE - 1)) == 0)); |
| 2079 | port->ip_inring = RING(port, RX_A); |
| 2080 | port->ip_outring = RING(port, TX_A); |
| 2081 | DPRINT_CONFIG(("%s : Port A ip_cpu_ringbuf 0x%p " |
| 2082 | "ip_dma_ringbuf 0x%p, ip_inring 0x%p " |
| 2083 | "ip_outring 0x%p\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 2084 | __func__, |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2085 | (void *)port->ip_cpu_ringbuf, |
| 2086 | (void *)port->ip_dma_ringbuf, |
| 2087 | (void *)port->ip_inring, |
| 2088 | (void *)port->ip_outring)); |
| 2089 | } |
| 2090 | else { |
| 2091 | port->ip_serial_regs = &idd->vma->port_b; |
| 2092 | port->ip_uart_regs = &idd->vma->sregs.uartb; |
| 2093 | |
| 2094 | DPRINT_CONFIG(("%s : Port B ip_serial_regs 0x%p " |
| 2095 | "ip_uart_regs 0x%p\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 2096 | __func__, |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2097 | (void *)port->ip_serial_regs, |
| 2098 | (void *)port->ip_uart_regs)); |
| 2099 | |
| 2100 | /* share the ring buffers */ |
| 2101 | port->ip_dma_ringbuf = |
| 2102 | ports[phys_port - 1]->ip_dma_ringbuf; |
| 2103 | port->ip_cpu_ringbuf = |
| 2104 | ports[phys_port - 1]->ip_cpu_ringbuf; |
| 2105 | port->ip_inring = RING(port, RX_B); |
| 2106 | port->ip_outring = RING(port, TX_B); |
| 2107 | DPRINT_CONFIG(("%s : Port B ip_cpu_ringbuf 0x%p " |
| 2108 | "ip_dma_ringbuf 0x%p, ip_inring 0x%p " |
| 2109 | "ip_outring 0x%p\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 2110 | __func__, |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2111 | (void *)port->ip_cpu_ringbuf, |
| 2112 | (void *)port->ip_dma_ringbuf, |
| 2113 | (void *)port->ip_inring, |
| 2114 | (void *)port->ip_outring)); |
| 2115 | } |
| 2116 | |
| 2117 | DPRINT_CONFIG(("%s : port %d [addr 0x%p] card_ptr 0x%p", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 2118 | __func__, |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2119 | phys_port, (void *)port, (void *)card_ptr)); |
| 2120 | DPRINT_CONFIG((" ip_serial_regs 0x%p ip_uart_regs 0x%p\n", |
| 2121 | (void *)port->ip_serial_regs, |
| 2122 | (void *)port->ip_uart_regs)); |
| 2123 | |
| 2124 | /* Initialize the hardware for IOC3 */ |
| 2125 | port_init(port); |
| 2126 | |
| 2127 | DPRINT_CONFIG(("%s: phys_port %d port 0x%p inring 0x%p " |
| 2128 | "outring 0x%p\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 2129 | __func__, |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2130 | phys_port, (void *)port, |
| 2131 | (void *)port->ip_inring, |
| 2132 | (void *)port->ip_outring)); |
| 2133 | |
| 2134 | } |
| 2135 | |
| 2136 | /* register port with the serial core */ |
| 2137 | |
| 2138 | if ((ret = ioc3_serial_core_attach(is, idd))) |
| 2139 | goto out4; |
| 2140 | |
| 2141 | Num_of_ioc3_cards++; |
| 2142 | |
| 2143 | return ret; |
| 2144 | |
| 2145 | /* error exits that give back resources */ |
| 2146 | out4: |
| 2147 | kfree(card_ptr); |
| 2148 | return ret; |
| 2149 | } |
| 2150 | |
Tony Luck | 3c0db89 | 2008-12-08 16:16:21 -0800 | [diff] [blame] | 2151 | static struct ioc3_submodule ioc3uart_ops = { |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2152 | .name = "IOC3uart", |
| 2153 | .probe = ioc3uart_probe, |
| 2154 | .remove = ioc3uart_remove, |
| 2155 | /* call .intr for both ports initially */ |
| 2156 | .irq_mask = SIO_IR_SA | SIO_IR_SB, |
| 2157 | .intr = ioc3uart_intr, |
| 2158 | .owner = THIS_MODULE, |
| 2159 | }; |
| 2160 | |
| 2161 | /** |
| 2162 | * ioc3_detect - module init called, |
| 2163 | */ |
Jean Delvare | 2ea5d35 | 2009-12-14 18:00:27 -0800 | [diff] [blame] | 2164 | static int __init ioc3uart_init(void) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2165 | { |
| 2166 | int ret; |
| 2167 | |
| 2168 | /* register with serial core */ |
| 2169 | if ((ret = uart_register_driver(&ioc3_uart)) < 0) { |
| 2170 | printk(KERN_WARNING |
| 2171 | "%s: Couldn't register IOC3 uart serial driver\n", |
Harvey Harrison | 71cc2c2 | 2008-04-30 00:55:10 -0700 | [diff] [blame] | 2172 | __func__); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2173 | return ret; |
| 2174 | } |
Tony Luck | 3c0db89 | 2008-12-08 16:16:21 -0800 | [diff] [blame] | 2175 | ret = ioc3_register_submodule(&ioc3uart_ops); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2176 | if (ret) |
| 2177 | uart_unregister_driver(&ioc3_uart); |
| 2178 | return ret; |
| 2179 | } |
| 2180 | |
Jean Delvare | 2ea5d35 | 2009-12-14 18:00:27 -0800 | [diff] [blame] | 2181 | static void __exit ioc3uart_exit(void) |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2182 | { |
Tony Luck | 3c0db89 | 2008-12-08 16:16:21 -0800 | [diff] [blame] | 2183 | ioc3_unregister_submodule(&ioc3uart_ops); |
Patrick Gefre | 2d0cfb5 | 2006-01-14 13:20:40 -0800 | [diff] [blame] | 2184 | uart_unregister_driver(&ioc3_uart); |
| 2185 | } |
| 2186 | |
| 2187 | module_init(ioc3uart_init); |
| 2188 | module_exit(ioc3uart_exit); |
| 2189 | |
| 2190 | MODULE_AUTHOR("Pat Gefre - Silicon Graphics Inc. (SGI) <pfg@sgi.com>"); |
| 2191 | MODULE_DESCRIPTION("Serial PCI driver module for SGI IOC3 card"); |
| 2192 | MODULE_LICENSE("GPL"); |