drivers/tty/serial/pch_uart.c

   1 /*
   2  *Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
   3  *
   4  *This program is free software; you can redistribute it and/or modify
   5  *it under the terms of the GNU General Public License as published by
   6  *the Free Software Foundation; version 2 of the License.
   7  *
   8  *This program is distributed in the hope that it will be useful,
   9  *but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *GNU General Public License for more details.
  12  *
  13  *You should have received a copy of the GNU General Public License
  14  *along with this program; if not, write to the Free Software
  15  *Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
  16  */
  17 #if defined(CONFIG_SERIAL_PCH_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  18 #define SUPPORT_SYSRQ
  19 #endif
  20 #include <linux/kernel.h>
  21 #include <linux/serial_reg.h>
  22 #include <linux/slab.h>
  23 #include <linux/module.h>
  24 #include <linux/pci.h>
  25 #include <linux/console.h>
  26 #include <linux/serial_core.h>
  27 #include <linux/tty.h>
  28 #include <linux/tty_flip.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/io.h>
  31 #include <linux/dmi.h>
  32 #include <linux/nmi.h>
  33 #include <linux/delay.h>
  34 #include <linux/of.h>
  35
  36 #include <linux/debugfs.h>
  37 #include <linux/dmaengine.h>
  38 #include <linux/pch_dma.h>
  39
  40 enum {
  41         PCH_UART_HANDLED_RX_INT_SHIFT,
  42         PCH_UART_HANDLED_TX_INT_SHIFT,
  43         PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
  44         PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
  45         PCH_UART_HANDLED_MS_INT_SHIFT,
  46         PCH_UART_HANDLED_LS_INT_SHIFT,
  47 };
  48
  49 enum {
  50         PCH_UART_8LINE,
  51         PCH_UART_2LINE,
  52 };
  53
  54 #define PCH_UART_DRIVER_DEVICE "ttyPCH"
  55
  56 /* Set the max number of UART port
  57  * Intel EG20T PCH: 4 port
  58  * LAPIS Semiconductor ML7213 IOH: 3 port
  59  * LAPIS Semiconductor ML7223 IOH: 2 port
  60 */
  61 #define PCH_UART_NR     4
  62
  63 #define PCH_UART_HANDLED_RX_INT (1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
  64 #define PCH_UART_HANDLED_TX_INT (1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
  65 #define PCH_UART_HANDLED_RX_ERR_INT     (1<<((\
  66                                         PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1))
  67 #define PCH_UART_HANDLED_RX_TRG_INT     (1<<((\
  68                                         PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1))
  69 #define PCH_UART_HANDLED_MS_INT (1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1))
  70
  71 #define PCH_UART_HANDLED_LS_INT (1<<((PCH_UART_HANDLED_LS_INT_SHIFT)<<1))
  72
  73 #define PCH_UART_RBR            0x00
  74 #define PCH_UART_THR            0x00
  75
  76 #define PCH_UART_IER_MASK       (PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\
  77                                 PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI)
  78 #define PCH_UART_IER_ERBFI      0x00000001
  79 #define PCH_UART_IER_ETBEI      0x00000002
  80 #define PCH_UART_IER_ELSI       0x00000004
  81 #define PCH_UART_IER_EDSSI      0x00000008
  82
  83 #define PCH_UART_IIR_IP                 0x00000001
  84 #define PCH_UART_IIR_IID                0x00000006
  85 #define PCH_UART_IIR_MSI                0x00000000
  86 #define PCH_UART_IIR_TRI                0x00000002
  87 #define PCH_UART_IIR_RRI                0x00000004
  88 #define PCH_UART_IIR_REI                0x00000006
  89 #define PCH_UART_IIR_TOI                0x00000008
  90 #define PCH_UART_IIR_FIFO256            0x00000020
  91 #define PCH_UART_IIR_FIFO64             PCH_UART_IIR_FIFO256
  92 #define PCH_UART_IIR_FE                 0x000000C0
  93
  94 #define PCH_UART_FCR_FIFOE              0x00000001
  95 #define PCH_UART_FCR_RFR                0x00000002
  96 #define PCH_UART_FCR_TFR                0x00000004
  97 #define PCH_UART_FCR_DMS                0x00000008
  98 #define PCH_UART_FCR_FIFO256            0x00000020
  99 #define PCH_UART_FCR_RFTL               0x000000C0
 100
 101 #define PCH_UART_FCR_RFTL1              0x00000000
 102 #define PCH_UART_FCR_RFTL64             0x00000040
 103 #define PCH_UART_FCR_RFTL128            0x00000080
 104 #define PCH_UART_FCR_RFTL224            0x000000C0
 105 #define PCH_UART_FCR_RFTL16             PCH_UART_FCR_RFTL64
 106 #define PCH_UART_FCR_RFTL32             PCH_UART_FCR_RFTL128
 107 #define PCH_UART_FCR_RFTL56             PCH_UART_FCR_RFTL224
 108 #define PCH_UART_FCR_RFTL4              PCH_UART_FCR_RFTL64
 109 #define PCH_UART_FCR_RFTL8              PCH_UART_FCR_RFTL128
 110 #define PCH_UART_FCR_RFTL14             PCH_UART_FCR_RFTL224
 111 #define PCH_UART_FCR_RFTL_SHIFT         6
 112
 113 #define PCH_UART_LCR_WLS        0x00000003
 114 #define PCH_UART_LCR_STB        0x00000004
 115 #define PCH_UART_LCR_PEN        0x00000008
 116 #define PCH_UART_LCR_EPS        0x00000010
 117 #define PCH_UART_LCR_SP         0x00000020
 118 #define PCH_UART_LCR_SB         0x00000040
 119 #define PCH_UART_LCR_DLAB       0x00000080
 120 #define PCH_UART_LCR_NP         0x00000000
 121 #define PCH_UART_LCR_OP         PCH_UART_LCR_PEN
 122 #define PCH_UART_LCR_EP         (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS)
 123 #define PCH_UART_LCR_1P         (PCH_UART_LCR_PEN | PCH_UART_LCR_SP)
 124 #define PCH_UART_LCR_0P         (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS |\
 125                                 PCH_UART_LCR_SP)
 126
 127 #define PCH_UART_LCR_5BIT       0x00000000
 128 #define PCH_UART_LCR_6BIT       0x00000001
 129 #define PCH_UART_LCR_7BIT       0x00000002
 130 #define PCH_UART_LCR_8BIT       0x00000003
 131
 132 #define PCH_UART_MCR_DTR        0x00000001
 133 #define PCH_UART_MCR_RTS        0x00000002
 134 #define PCH_UART_MCR_OUT        0x0000000C
 135 #define PCH_UART_MCR_LOOP       0x00000010
 136 #define PCH_UART_MCR_AFE        0x00000020
 137
 138 #define PCH_UART_LSR_DR         0x00000001
 139 #define PCH_UART_LSR_ERR        (1<<7)
 140
 141 #define PCH_UART_MSR_DCTS       0x00000001
 142 #define PCH_UART_MSR_DDSR       0x00000002
 143 #define PCH_UART_MSR_TERI       0x00000004
 144 #define PCH_UART_MSR_DDCD       0x00000008
 145 #define PCH_UART_MSR_CTS        0x00000010
 146 #define PCH_UART_MSR_DSR        0x00000020
 147 #define PCH_UART_MSR_RI         0x00000040
 148 #define PCH_UART_MSR_DCD        0x00000080
 149 #define PCH_UART_MSR_DELTA      (PCH_UART_MSR_DCTS | PCH_UART_MSR_DDSR |\
 150                                 PCH_UART_MSR_TERI | PCH_UART_MSR_DDCD)
 151
 152 #define PCH_UART_DLL            0x00
 153 #define PCH_UART_DLM            0x01
 154
 155 #define PCH_UART_BRCSR          0x0E
 156
 157 #define PCH_UART_IID_RLS        (PCH_UART_IIR_REI)
 158 #define PCH_UART_IID_RDR        (PCH_UART_IIR_RRI)
 159 #define PCH_UART_IID_RDR_TO     (PCH_UART_IIR_RRI | PCH_UART_IIR_TOI)
 160 #define PCH_UART_IID_THRE       (PCH_UART_IIR_TRI)
 161 #define PCH_UART_IID_MS         (PCH_UART_IIR_MSI)
 162
 163 #define PCH_UART_HAL_PARITY_NONE        (PCH_UART_LCR_NP)
 164 #define PCH_UART_HAL_PARITY_ODD         (PCH_UART_LCR_OP)
 165 #define PCH_UART_HAL_PARITY_EVEN        (PCH_UART_LCR_EP)
 166 #define PCH_UART_HAL_PARITY_FIX1        (PCH_UART_LCR_1P)
 167 #define PCH_UART_HAL_PARITY_FIX0        (PCH_UART_LCR_0P)
 168 #define PCH_UART_HAL_5BIT               (PCH_UART_LCR_5BIT)
 169 #define PCH_UART_HAL_6BIT               (PCH_UART_LCR_6BIT)
 170 #define PCH_UART_HAL_7BIT               (PCH_UART_LCR_7BIT)
 171 #define PCH_UART_HAL_8BIT               (PCH_UART_LCR_8BIT)
 172 #define PCH_UART_HAL_STB1               0
 173 #define PCH_UART_HAL_STB2               (PCH_UART_LCR_STB)
 174
 175 #define PCH_UART_HAL_CLR_TX_FIFO        (PCH_UART_FCR_TFR)
 176 #define PCH_UART_HAL_CLR_RX_FIFO        (PCH_UART_FCR_RFR)
 177 #define PCH_UART_HAL_CLR_ALL_FIFO       (PCH_UART_HAL_CLR_TX_FIFO | \
 178                                         PCH_UART_HAL_CLR_RX_FIFO)
 179
 180 #define PCH_UART_HAL_DMA_MODE0          0
 181 #define PCH_UART_HAL_FIFO_DIS           0
 182 #define PCH_UART_HAL_FIFO16             (PCH_UART_FCR_FIFOE)
 183 #define PCH_UART_HAL_FIFO256            (PCH_UART_FCR_FIFOE | \
 184                                         PCH_UART_FCR_FIFO256)
 185 #define PCH_UART_HAL_FIFO64             (PCH_UART_HAL_FIFO256)
 186 #define PCH_UART_HAL_TRIGGER1           (PCH_UART_FCR_RFTL1)
 187 #define PCH_UART_HAL_TRIGGER64          (PCH_UART_FCR_RFTL64)
 188 #define PCH_UART_HAL_TRIGGER128         (PCH_UART_FCR_RFTL128)
 189 #define PCH_UART_HAL_TRIGGER224         (PCH_UART_FCR_RFTL224)
 190 #define PCH_UART_HAL_TRIGGER16          (PCH_UART_FCR_RFTL16)
 191 #define PCH_UART_HAL_TRIGGER32          (PCH_UART_FCR_RFTL32)
 192 #define PCH_UART_HAL_TRIGGER56          (PCH_UART_FCR_RFTL56)
 193 #define PCH_UART_HAL_TRIGGER4           (PCH_UART_FCR_RFTL4)
 194 #define PCH_UART_HAL_TRIGGER8           (PCH_UART_FCR_RFTL8)
 195 #define PCH_UART_HAL_TRIGGER14          (PCH_UART_FCR_RFTL14)
 196 #define PCH_UART_HAL_TRIGGER_L          (PCH_UART_FCR_RFTL64)
 197 #define PCH_UART_HAL_TRIGGER_M          (PCH_UART_FCR_RFTL128)
 198 #define PCH_UART_HAL_TRIGGER_H          (PCH_UART_FCR_RFTL224)
 199
 200 #define PCH_UART_HAL_RX_INT             (PCH_UART_IER_ERBFI)
 201 #define PCH_UART_HAL_TX_INT             (PCH_UART_IER_ETBEI)
 202 #define PCH_UART_HAL_RX_ERR_INT         (PCH_UART_IER_ELSI)
 203 #define PCH_UART_HAL_MS_INT             (PCH_UART_IER_EDSSI)
 204 #define PCH_UART_HAL_ALL_INT            (PCH_UART_IER_MASK)
 205
 206 #define PCH_UART_HAL_DTR                (PCH_UART_MCR_DTR)
 207 #define PCH_UART_HAL_RTS                (PCH_UART_MCR_RTS)
 208 #define PCH_UART_HAL_OUT                (PCH_UART_MCR_OUT)
 209 #define PCH_UART_HAL_LOOP               (PCH_UART_MCR_LOOP)
 210 #define PCH_UART_HAL_AFE                (PCH_UART_MCR_AFE)
 211
 212 #define PCI_VENDOR_ID_ROHM              0x10DB
 213
 214 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
 215
 216 #define DEFAULT_UARTCLK   1843200 /*   1.8432 MHz */
 217 #define CMITC_UARTCLK   192000000 /* 192.0000 MHz */
 218 #define FRI2_64_UARTCLK  64000000 /*  64.0000 MHz */
 219 #define FRI2_48_UARTCLK  48000000 /*  48.0000 MHz */
 220 #define NTC1_UARTCLK     64000000 /*  64.0000 MHz */
 221 #define MINNOW_UARTCLK   50000000 /*  50.0000 MHz */
 222
 223 struct pch_uart_buffer {
 224         unsigned char *buf;
 225         int size;
 226 };
 227
 228 struct eg20t_port {
 229         struct uart_port port;
 230         int port_type;
 231         void __iomem *membase;
 232         resource_size_t mapbase;
 233         unsigned int iobase;
 234         struct pci_dev *pdev;
 235         int fifo_size;
 236         unsigned int uartclk;
 237         int start_tx;
 238         int start_rx;
 239         int tx_empty;
 240         int trigger;
 241         int trigger_level;
 242         struct pch_uart_buffer rxbuf;
 243         unsigned int dmsr;
 244         unsigned int fcr;
 245         unsigned int mcr;
 246         unsigned int use_dma;
 247         struct dma_async_tx_descriptor  *desc_tx;
 248         struct dma_async_tx_descriptor  *desc_rx;
 249         struct pch_dma_slave            param_tx;
 250         struct pch_dma_slave            param_rx;
 251         struct dma_chan                 *chan_tx;
 252         struct dma_chan                 *chan_rx;
 253         struct scatterlist              *sg_tx_p;
 254         int                             nent;
 255         struct scatterlist              sg_rx;
 256         int                             tx_dma_use;
 257         void                            *rx_buf_virt;
 258         dma_addr_t                      rx_buf_dma;
 259
 260         struct dentry   *debugfs;
 261 #define IRQ_NAME_SIZE 17
 262         char                            irq_name[IRQ_NAME_SIZE];
 263
 264         /* protect the eg20t_port private structure and io access to membase */
 265         spinlock_t lock;
 266 };
 267
 268 /**
 269  * struct pch_uart_driver_data - private data structure for UART-DMA
 270  * @port_type:                  The number of DMA channel
 271  * @line_no:                    UART port line number (0, 1, 2...)
 272  */
 273 struct pch_uart_driver_data {
 274         int port_type;
 275         int line_no;
 276 };
 277
 278 enum pch_uart_num_t {
 279         pch_et20t_uart0 = 0,
 280         pch_et20t_uart1,
 281         pch_et20t_uart2,
 282         pch_et20t_uart3,
 283         pch_ml7213_uart0,
 284         pch_ml7213_uart1,
 285         pch_ml7213_uart2,
 286         pch_ml7223_uart0,
 287         pch_ml7223_uart1,
 288         pch_ml7831_uart0,
 289         pch_ml7831_uart1,
 290 };
 291
 292 static struct pch_uart_driver_data drv_dat[] = {
 293         [pch_et20t_uart0] = {PCH_UART_8LINE, 0},
 294         [pch_et20t_uart1] = {PCH_UART_2LINE, 1},
 295         [pch_et20t_uart2] = {PCH_UART_2LINE, 2},
 296         [pch_et20t_uart3] = {PCH_UART_2LINE, 3},
 297         [pch_ml7213_uart0] = {PCH_UART_8LINE, 0},
 298         [pch_ml7213_uart1] = {PCH_UART_2LINE, 1},
 299         [pch_ml7213_uart2] = {PCH_UART_2LINE, 2},
 300         [pch_ml7223_uart0] = {PCH_UART_8LINE, 0},
 301         [pch_ml7223_uart1] = {PCH_UART_2LINE, 1},
 302         [pch_ml7831_uart0] = {PCH_UART_8LINE, 0},
 303         [pch_ml7831_uart1] = {PCH_UART_2LINE, 1},
 304 };
 305
 306 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
 307 static struct eg20t_port *pch_uart_ports[PCH_UART_NR];
 308 #endif
 309 static unsigned int default_baud = 9600;
 310 static unsigned int user_uartclk = 0;
 311 static const int trigger_level_256[4] = { 1, 64, 128, 224 };
 312 static const int trigger_level_64[4] = { 1, 16, 32, 56 };
 313 static const int trigger_level_16[4] = { 1, 4, 8, 14 };
 314 static const int trigger_level_1[4] = { 1, 1, 1, 1 };
 315
 316 #ifdef CONFIG_DEBUG_FS
 317
 318 #define PCH_REGS_BUFSIZE        1024
 319
 320
 321 static ssize_t port_show_regs(struct file *file, char __user *user_buf,
 322                                 size_t count, loff_t *ppos)
 323 {
 324         struct eg20t_port *priv = file->private_data;
 325         char *buf;
 326         u32 len = 0;
 327         ssize_t ret;
 328         unsigned char lcr;
 329
 330         buf = kzalloc(PCH_REGS_BUFSIZE, GFP_KERNEL);
 331         if (!buf)
 332                 return 0;
 333
 334         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 335                         "PCH EG20T port[%d] regs:\n", priv->port.line);
 336
 337         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 338                         "=================================\n");
 339         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 340                         "IER: \t0x%02x\n", ioread8(priv->membase + UART_IER));
 341         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 342                         "IIR: \t0x%02x\n", ioread8(priv->membase + UART_IIR));
 343         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 344                         "LCR: \t0x%02x\n", ioread8(priv->membase + UART_LCR));
 345         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 346                         "MCR: \t0x%02x\n", ioread8(priv->membase + UART_MCR));
 347         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 348                         "LSR: \t0x%02x\n", ioread8(priv->membase + UART_LSR));
 349         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 350                         "MSR: \t0x%02x\n", ioread8(priv->membase + UART_MSR));
 351         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 352                         "BRCSR: \t0x%02x\n",
 353                         ioread8(priv->membase + PCH_UART_BRCSR));
 354
 355         lcr = ioread8(priv->membase + UART_LCR);
 356         iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
 357         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 358                         "DLL: \t0x%02x\n", ioread8(priv->membase + UART_DLL));
 359         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 360                         "DLM: \t0x%02x\n", ioread8(priv->membase + UART_DLM));
 361         iowrite8(lcr, priv->membase + UART_LCR);
 362
 363         if (len > PCH_REGS_BUFSIZE)
 364                 len = PCH_REGS_BUFSIZE;
 365
 366         ret =  simple_read_from_buffer(user_buf, count, ppos, buf, len);
 367         kfree(buf);
 368         return ret;
 369 }
 370
 371 static const struct file_operations port_regs_ops = {
 372         .owner          = THIS_MODULE,
 373         .open           = simple_open,
 374         .read           = port_show_regs,
 375         .llseek         = default_llseek,
 376 };
 377 #endif  /* CONFIG_DEBUG_FS */
 378
 379 static struct dmi_system_id pch_uart_dmi_table[] = {
 380         {
 381                 .ident = "CM-iTC",
 382                 {
 383                         DMI_MATCH(DMI_BOARD_NAME, "CM-iTC"),
 384                 },
 385                 (void *)CMITC_UARTCLK,
 386         },
 387         {
 388                 .ident = "FRI2",
 389                 {
 390                         DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
 391                 },
 392                 (void *)FRI2_64_UARTCLK,
 393         },
 394         {
 395                 .ident = "Fish River Island II",
 396                 {
 397                         DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
 398                 },
 399                 (void *)FRI2_48_UARTCLK,
 400         },
 401         {
 402                 .ident = "COMe-mTT",
 403                 {
 404                         DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
 405                 },
 406                 (void *)NTC1_UARTCLK,
 407         },
 408         {
 409                 .ident = "nanoETXexpress-TT",
 410                 {
 411                         DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
 412                 },
 413                 (void *)NTC1_UARTCLK,
 414         },
 415         {
 416                 .ident = "MinnowBoard",
 417                 {
 418                         DMI_MATCH(DMI_BOARD_NAME, "MinnowBoard"),
 419                 },
 420                 (void *)MINNOW_UARTCLK,
 421         },
 422 };
 423
 424 /* Return UART clock, checking for board specific clocks. */
 425 static unsigned int pch_uart_get_uartclk(void)
 426 {
 427         const struct dmi_system_id *d;
 428
 429         if (user_uartclk)
 430                 return user_uartclk;
 431
 432         d = dmi_first_match(pch_uart_dmi_table);
 433         if (d)
 434                 return (unsigned long)d->driver_data;
 435
 436         return DEFAULT_UARTCLK;
 437 }
 438
 439 static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv,
 440                                           unsigned int flag)
 441 {
 442         u8 ier = ioread8(priv->membase + UART_IER);
 443         ier |= flag & PCH_UART_IER_MASK;
 444         iowrite8(ier, priv->membase + UART_IER);
 445 }
 446
 447 static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
 448                                            unsigned int flag)
 449 {
 450         u8 ier = ioread8(priv->membase + UART_IER);
 451         ier &= ~(flag & PCH_UART_IER_MASK);
 452         iowrite8(ier, priv->membase + UART_IER);
 453 }
 454
 455 static int pch_uart_hal_set_line(struct eg20t_port *priv, unsigned int baud,
 456                                  unsigned int parity, unsigned int bits,
 457                                  unsigned int stb)
 458 {
 459         unsigned int dll, dlm, lcr;
 460         int div;
 461
 462         div = DIV_ROUND_CLOSEST(priv->uartclk / 16, baud);
 463         if (div < 0 || USHRT_MAX <= div) {
 464                 dev_err(priv->port.dev, "Invalid Baud(div=0x%x)\n", div);
 465                 return -EINVAL;
 466         }
 467
 468         dll = (unsigned int)div & 0x00FFU;
 469         dlm = ((unsigned int)div >> 8) & 0x00FFU;
 470
 471         if (parity & ~(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS | PCH_UART_LCR_SP)) {
 472                 dev_err(priv->port.dev, "Invalid parity(0x%x)\n", parity);
 473                 return -EINVAL;
 474         }
 475
 476         if (bits & ~PCH_UART_LCR_WLS) {
 477                 dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits);
 478                 return -EINVAL;
 479         }
 480
 481         if (stb & ~PCH_UART_LCR_STB) {
 482                 dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb);
 483                 return -EINVAL;
 484         }
 485
 486         lcr = parity;
 487         lcr |= bits;
 488         lcr |= stb;
 489
 490         dev_dbg(priv->port.dev, "%s:baud = %u, div = %04x, lcr = %02x (%lu)\n",
 491                  __func__, baud, div, lcr, jiffies);
 492         iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
 493         iowrite8(dll, priv->membase + PCH_UART_DLL);
 494         iowrite8(dlm, priv->membase + PCH_UART_DLM);
 495         iowrite8(lcr, priv->membase + UART_LCR);
 496
 497         return 0;
 498 }
 499
 500 static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
 501                                     unsigned int flag)
 502 {
 503         if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) {
 504                 dev_err(priv->port.dev, "%s:Invalid flag(0x%x)\n",
 505                         __func__, flag);
 506                 return -EINVAL;
 507         }
 508
 509         iowrite8(PCH_UART_FCR_FIFOE | priv->fcr, priv->membase + UART_FCR);
 510         iowrite8(PCH_UART_FCR_FIFOE | priv->fcr | flag,
 511                  priv->membase + UART_FCR);
 512         iowrite8(priv->fcr, priv->membase + UART_FCR);
 513
 514         return 0;
 515 }
 516
 517 static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
 518                                  unsigned int dmamode,
 519                                  unsigned int fifo_size, unsigned int trigger)
 520 {
 521         u8 fcr;
 522
 523         if (dmamode & ~PCH_UART_FCR_DMS) {
 524                 dev_err(priv->port.dev, "%s:Invalid DMA Mode(0x%x)\n",
 525                         __func__, dmamode);
 526                 return -EINVAL;
 527         }
 528
 529         if (fifo_size & ~(PCH_UART_FCR_FIFOE | PCH_UART_FCR_FIFO256)) {
 530                 dev_err(priv->port.dev, "%s:Invalid FIFO SIZE(0x%x)\n",
 531                         __func__, fifo_size);
 532                 return -EINVAL;
 533         }
 534
 535         if (trigger & ~PCH_UART_FCR_RFTL) {
 536                 dev_err(priv->port.dev, "%s:Invalid TRIGGER(0x%x)\n",
 537                         __func__, trigger);
 538                 return -EINVAL;
 539         }
 540
 541         switch (priv->fifo_size) {
 542         case 256:
 543                 priv->trigger_level =
 544                     trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 545                 break;
 546         case 64:
 547                 priv->trigger_level =
 548                     trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 549                 break;
 550         case 16:
 551                 priv->trigger_level =
 552                     trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 553                 break;
 554         default:
 555                 priv->trigger_level =
 556                     trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 557                 break;
 558         }
 559         fcr =
 560             dmamode | fifo_size | trigger | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR;
 561         iowrite8(PCH_UART_FCR_FIFOE, priv->membase + UART_FCR);
 562         iowrite8(PCH_UART_FCR_FIFOE | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR,
 563                  priv->membase + UART_FCR);
 564         iowrite8(fcr, priv->membase + UART_FCR);
 565         priv->fcr = fcr;
 566
 567         return 0;
 568 }
 569
 570 static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
 571 {
 572         unsigned int msr = ioread8(priv->membase + UART_MSR);
 573         priv->dmsr = msr & PCH_UART_MSR_DELTA;
 574         return (u8)msr;
 575 }
 576
 577 static void pch_uart_hal_write(struct eg20t_port *priv,
 578                               const unsigned char *buf, int tx_size)
 579 {
 580         int i;
 581         unsigned int thr;
 582
 583         for (i = 0; i < tx_size;) {
 584                 thr = buf[i++];
 585                 iowrite8(thr, priv->membase + PCH_UART_THR);
 586         }
 587 }
 588
 589 static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
 590                              int rx_size)
 591 {
 592         int i;
 593         u8 rbr, lsr;
 594         struct uart_port *port = &priv->port;
 595
 596         lsr = ioread8(priv->membase + UART_LSR);
 597         for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
 598              i < rx_size && lsr & (UART_LSR_DR | UART_LSR_BI);
 599              lsr = ioread8(priv->membase + UART_LSR)) {
 600                 rbr = ioread8(priv->membase + PCH_UART_RBR);
 601
 602                 if (lsr & UART_LSR_BI) {
 603                         port->icount.brk++;
 604                         if (uart_handle_break(port))
 605                                 continue;
 606                 }
 607 #ifdef SUPPORT_SYSRQ
 608                 if (port->sysrq) {
 609                         if (uart_handle_sysrq_char(port, rbr))
 610                                 continue;
 611                 }
 612 #endif
 613
 614                 buf[i++] = rbr;
 615         }
 616         return i;
 617 }
 618
 619 static unsigned char pch_uart_hal_get_iid(struct eg20t_port *priv)
 620 {
 621         return ioread8(priv->membase + UART_IIR) &\
 622                       (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP);
 623 }
 624
 625 static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
 626 {
 627         return ioread8(priv->membase + UART_LSR);
 628 }
 629
 630 static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
 631 {
 632         unsigned int lcr;
 633
 634         lcr = ioread8(priv->membase + UART_LCR);
 635         if (on)
 636                 lcr |= PCH_UART_LCR_SB;
 637         else
 638                 lcr &= ~PCH_UART_LCR_SB;
 639
 640         iowrite8(lcr, priv->membase + UART_LCR);
 641 }
 642
 643 static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
 644                    int size)
 645 {
 646         struct uart_port *port = &priv->port;
 647         struct tty_port *tport = &port->state->port;
 648
 649         tty_insert_flip_string(tport, buf, size);
 650         tty_flip_buffer_push(tport);
 651
 652         return 0;
 653 }
 654
 655 static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf)
 656 {
 657         int ret = 0;
 658         struct uart_port *port = &priv->port;
 659
 660         if (port->x_char) {
 661                 dev_dbg(priv->port.dev, "%s:X character send %02x (%lu)\n",
 662                         __func__, port->x_char, jiffies);
 663                 buf[0] = port->x_char;
 664                 port->x_char = 0;
 665                 ret = 1;
 666         }
 667
 668         return ret;
 669 }
 670
 671 static int dma_push_rx(struct eg20t_port *priv, int size)
 672 {
 673         int room;
 674         struct uart_port *port = &priv->port;
 675         struct tty_port *tport = &port->state->port;
 676
 677         room = tty_buffer_request_room(tport, size);
 678
 679         if (room < size)
 680                 dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
 681                          size - room);
 682         if (!room)
 683                 return 0;
 684
 685         tty_insert_flip_string(tport, sg_virt(&priv->sg_rx), size);
 686
 687         port->icount.rx += room;
 688
 689         return room;
 690 }
 691
 692 static void pch_free_dma(struct uart_port *port)
 693 {
 694         struct eg20t_port *priv;
 695         priv = container_of(port, struct eg20t_port, port);
 696
 697         if (priv->chan_tx) {
 698                 dma_release_channel(priv->chan_tx);
 699                 priv->chan_tx = NULL;
 700         }
 701         if (priv->chan_rx) {
 702                 dma_release_channel(priv->chan_rx);
 703                 priv->chan_rx = NULL;
 704         }
 705
 706         if (priv->rx_buf_dma) {
 707                 dma_free_coherent(port->dev, port->fifosize, priv->rx_buf_virt,
 708                                   priv->rx_buf_dma);
 709                 priv->rx_buf_virt = NULL;
 710                 priv->rx_buf_dma = 0;
 711         }
 712
 713         return;
 714 }
 715
 716 static bool filter(struct dma_chan *chan, void *slave)
 717 {
 718         struct pch_dma_slave *param = slave;
 719
 720         if ((chan->chan_id == param->chan_id) && (param->dma_dev ==
 721                                                   chan->device->dev)) {
 722                 chan->private = param;
 723                 return true;
 724         } else {
 725                 return false;
 726         }
 727 }
 728
 729 static void pch_request_dma(struct uart_port *port)
 730 {
 731         dma_cap_mask_t mask;
 732         struct dma_chan *chan;
 733         struct pci_dev *dma_dev;
 734         struct pch_dma_slave *param;
 735         struct eg20t_port *priv =
 736                                 container_of(port, struct eg20t_port, port);
 737         dma_cap_zero(mask);
 738         dma_cap_set(DMA_SLAVE, mask);
 739
 740         /* Get DMA's dev information */
 741         dma_dev = pci_get_slot(priv->pdev->bus,
 742                         PCI_DEVFN(PCI_SLOT(priv->pdev->devfn), 0));
 743
 744         /* Set Tx DMA */
 745         param = &priv->param_tx;
 746         param->dma_dev = &dma_dev->dev;
 747         param->chan_id = priv->port.line * 2; /* Tx = 0, 2, 4, ... */
 748
 749         param->tx_reg = port->mapbase + UART_TX;
 750         chan = dma_request_channel(mask, filter, param);
 751         if (!chan) {
 752                 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
 753                         __func__);
 754                 return;
 755         }
 756         priv->chan_tx = chan;
 757
 758         /* Set Rx DMA */
 759         param = &priv->param_rx;
 760         param->dma_dev = &dma_dev->dev;
 761         param->chan_id = priv->port.line * 2 + 1; /* Rx = Tx + 1 */
 762
 763         param->rx_reg = port->mapbase + UART_RX;
 764         chan = dma_request_channel(mask, filter, param);
 765         if (!chan) {
 766                 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Rx)\n",
 767                         __func__);
 768                 dma_release_channel(priv->chan_tx);
 769                 priv->chan_tx = NULL;
 770                 return;
 771         }
 772
 773         /* Get Consistent memory for DMA */
 774         priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
 775                                     &priv->rx_buf_dma, GFP_KERNEL);
 776         priv->chan_rx = chan;
 777 }
 778
 779 static void pch_dma_rx_complete(void *arg)
 780 {
 781         struct eg20t_port *priv = arg;
 782         struct uart_port *port = &priv->port;
 783         int count;
 784
 785         dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
 786         count = dma_push_rx(priv, priv->trigger_level);
 787         if (count)
 788                 tty_flip_buffer_push(&port->state->port);
 789         async_tx_ack(priv->desc_rx);
 790         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
 791                                             PCH_UART_HAL_RX_ERR_INT);
 792 }
 793
 794 static void pch_dma_tx_complete(void *arg)
 795 {
 796         struct eg20t_port *priv = arg;
 797         struct uart_port *port = &priv->port;
 798         struct circ_buf *xmit = &port->state->xmit;
 799         struct scatterlist *sg = priv->sg_tx_p;
 800         int i;
 801
 802         for (i = 0; i < priv->nent; i++, sg++) {
 803                 xmit->tail += sg_dma_len(sg);
 804                 port->icount.tx += sg_dma_len(sg);
 805         }
 806         xmit->tail &= UART_XMIT_SIZE - 1;
 807         async_tx_ack(priv->desc_tx);
 808         dma_unmap_sg(port->dev, sg, priv->nent, DMA_TO_DEVICE);
 809         priv->tx_dma_use = 0;
 810         priv->nent = 0;
 811         kfree(priv->sg_tx_p);
 812         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
 813 }
 814
 815 static int pop_tx(struct eg20t_port *priv, int size)
 816 {
 817         int count = 0;
 818         struct uart_port *port = &priv->port;
 819         struct circ_buf *xmit = &port->state->xmit;
 820
 821         if (uart_tx_stopped(port) || uart_circ_empty(xmit) || count >= size)
 822                 goto pop_tx_end;
 823
 824         do {
 825                 int cnt_to_end =
 826                     CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
 827                 int sz = min(size - count, cnt_to_end);
 828                 pch_uart_hal_write(priv, &xmit->buf[xmit->tail], sz);
 829                 xmit->tail = (xmit->tail + sz) & (UART_XMIT_SIZE - 1);
 830                 count += sz;
 831         } while (!uart_circ_empty(xmit) && count < size);
 832
 833 pop_tx_end:
 834         dev_dbg(priv->port.dev, "%d characters. Remained %d characters.(%lu)\n",
 835                  count, size - count, jiffies);
 836
 837         return count;
 838 }
 839
 840 static int handle_rx_to(struct eg20t_port *priv)
 841 {
 842         struct pch_uart_buffer *buf;
 843         int rx_size;
 844         int ret;
 845         if (!priv->start_rx) {
 846                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
 847                                                      PCH_UART_HAL_RX_ERR_INT);
 848                 return 0;
 849         }
 850         buf = &priv->rxbuf;
 851         do {
 852                 rx_size = pch_uart_hal_read(priv, buf->buf, buf->size);
 853                 ret = push_rx(priv, buf->buf, rx_size);
 854                 if (ret)
 855                         return 0;
 856         } while (rx_size == buf->size);
 857
 858         return PCH_UART_HANDLED_RX_INT;
 859 }
 860
 861 static int handle_rx(struct eg20t_port *priv)
 862 {
 863         return handle_rx_to(priv);
 864 }
 865
 866 static int dma_handle_rx(struct eg20t_port *priv)
 867 {
 868         struct uart_port *port = &priv->port;
 869         struct dma_async_tx_descriptor *desc;
 870         struct scatterlist *sg;
 871
 872         priv = container_of(port, struct eg20t_port, port);
 873         sg = &priv->sg_rx;
 874
 875         sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */
 876
 877         sg_dma_len(sg) = priv->trigger_level;
 878
 879         sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt),
 880                      sg_dma_len(sg), (unsigned long)priv->rx_buf_virt &
 881                      ~PAGE_MASK);
 882
 883         sg_dma_address(sg) = priv->rx_buf_dma;
 884
 885         desc = dmaengine_prep_slave_sg(priv->chan_rx,
 886                         sg, 1, DMA_DEV_TO_MEM,
 887                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 888
 889         if (!desc)
 890                 return 0;
 891
 892         priv->desc_rx = desc;
 893         desc->callback = pch_dma_rx_complete;
 894         desc->callback_param = priv;
 895         desc->tx_submit(desc);
 896         dma_async_issue_pending(priv->chan_rx);
 897
 898         return PCH_UART_HANDLED_RX_INT;
 899 }
 900
 901 static unsigned int handle_tx(struct eg20t_port *priv)
 902 {
 903         struct uart_port *port = &priv->port;
 904         struct circ_buf *xmit = &port->state->xmit;
 905         int fifo_size;
 906         int tx_size;
 907         int size;
 908         int tx_empty;
 909
 910         if (!priv->start_tx) {
 911                 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
 912                         __func__, jiffies);
 913                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 914                 priv->tx_empty = 1;
 915                 return 0;
 916         }
 917
 918         fifo_size = max(priv->fifo_size, 1);
 919         tx_empty = 1;
 920         if (pop_tx_x(priv, xmit->buf)) {
 921                 pch_uart_hal_write(priv, xmit->buf, 1);
 922                 port->icount.tx++;
 923                 tx_empty = 0;
 924                 fifo_size--;
 925         }
 926         size = min(xmit->head - xmit->tail, fifo_size);
 927         if (size < 0)
 928                 size = fifo_size;
 929
 930         tx_size = pop_tx(priv, size);
 931         if (tx_size > 0) {
 932                 port->icount.tx += tx_size;
 933                 tx_empty = 0;
 934         }
 935
 936         priv->tx_empty = tx_empty;
 937
 938         if (tx_empty) {
 939                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 940                 uart_write_wakeup(port);
 941         }
 942
 943         return PCH_UART_HANDLED_TX_INT;
 944 }
 945
 946 static unsigned int dma_handle_tx(struct eg20t_port *priv)
 947 {
 948         struct uart_port *port = &priv->port;
 949         struct circ_buf *xmit = &port->state->xmit;
 950         struct scatterlist *sg;
 951         int nent;
 952         int fifo_size;
 953         int tx_empty;
 954         struct dma_async_tx_descriptor *desc;
 955         int num;
 956         int i;
 957         int bytes;
 958         int size;
 959         int rem;
 960
 961         if (!priv->start_tx) {
 962                 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
 963                         __func__, jiffies);
 964                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 965                 priv->tx_empty = 1;
 966                 return 0;
 967         }
 968
 969         if (priv->tx_dma_use) {
 970                 dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n",
 971                         __func__, jiffies);
 972                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 973                 priv->tx_empty = 1;
 974                 return 0;
 975         }
 976
 977         fifo_size = max(priv->fifo_size, 1);
 978         tx_empty = 1;
 979         if (pop_tx_x(priv, xmit->buf)) {
 980                 pch_uart_hal_write(priv, xmit->buf, 1);
 981                 port->icount.tx++;
 982                 tx_empty = 0;
 983                 fifo_size--;
 984         }
 985
 986         bytes = min((int)CIRC_CNT(xmit->head, xmit->tail,
 987                              UART_XMIT_SIZE), CIRC_CNT_TO_END(xmit->head,
 988                              xmit->tail, UART_XMIT_SIZE));
 989         if (!bytes) {
 990                 dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__);
 991                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 992                 uart_write_wakeup(port);
 993                 return 0;
 994         }
 995
 996         if (bytes > fifo_size) {
 997                 num = bytes / fifo_size + 1;
 998                 size = fifo_size;
 999                 rem = bytes % fifo_size;
1000         } else {
1001                 num = 1;
1002                 size = bytes;
1003                 rem = bytes;
1004         }
1005
1006         dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n",
1007                 __func__, num, size, rem);
1008
1009         priv->tx_dma_use = 1;
1010
1011         priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
1012         if (!priv->sg_tx_p) {
1013                 dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__);
1014                 return 0;
1015         }
1016
1017         sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
1018         sg = priv->sg_tx_p;
1019
1020         for (i = 0; i < num; i++, sg++) {
1021                 if (i == (num - 1))
1022                         sg_set_page(sg, virt_to_page(xmit->buf),
1023                                     rem, fifo_size * i);
1024                 else
1025                         sg_set_page(sg, virt_to_page(xmit->buf),
1026                                     size, fifo_size * i);
1027         }
1028
1029         sg = priv->sg_tx_p;
1030         nent = dma_map_sg(port->dev, sg, num, DMA_TO_DEVICE);
1031         if (!nent) {
1032                 dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__);
1033                 return 0;
1034         }
1035         priv->nent = nent;
1036
1037         for (i = 0; i < nent; i++, sg++) {
1038                 sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) +
1039                               fifo_size * i;
1040                 sg_dma_address(sg) = (sg_dma_address(sg) &
1041                                     ~(UART_XMIT_SIZE - 1)) + sg->offset;
1042                 if (i == (nent - 1))
1043                         sg_dma_len(sg) = rem;
1044                 else
1045                         sg_dma_len(sg) = size;
1046         }
1047
1048         desc = dmaengine_prep_slave_sg(priv->chan_tx,
1049                                         priv->sg_tx_p, nent, DMA_MEM_TO_DEV,
1050                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1051         if (!desc) {
1052                 dev_err(priv->port.dev, "%s:dmaengine_prep_slave_sg Failed\n",
1053                         __func__);
1054                 return 0;
1055         }
1056         dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE);
1057         priv->desc_tx = desc;
1058         desc->callback = pch_dma_tx_complete;
1059         desc->callback_param = priv;
1060
1061         desc->tx_submit(desc);
1062
1063         dma_async_issue_pending(priv->chan_tx);
1064
1065         return PCH_UART_HANDLED_TX_INT;
1066 }
1067
1068 static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
1069 {
1070         struct uart_port *port = &priv->port;
1071         struct tty_struct *tty = tty_port_tty_get(&port->state->port);
1072         char   *error_msg[5] = {};
1073         int    i = 0;
1074
1075         if (lsr & PCH_UART_LSR_ERR)
1076                 error_msg[i++] = "Error data in FIFO\n";
1077
1078         if (lsr & UART_LSR_FE) {
1079                 port->icount.frame++;
1080                 error_msg[i++] = "  Framing Error\n";
1081         }
1082
1083         if (lsr & UART_LSR_PE) {
1084                 port->icount.parity++;
1085                 error_msg[i++] = "  Parity Error\n";
1086         }
1087
1088         if (lsr & UART_LSR_OE) {
1089                 port->icount.overrun++;
1090                 error_msg[i++] = "  Overrun Error\n";
1091         }
1092
1093         if (tty == NULL) {
1094                 for (i = 0; error_msg[i] != NULL; i++)
1095                         dev_err(&priv->pdev->dev, error_msg[i]);
1096         } else {
1097                 tty_kref_put(tty);
1098         }
1099 }
1100
1101 static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
1102 {
1103         struct eg20t_port *priv = dev_id;
1104         unsigned int handled;
1105         u8 lsr;
1106         int ret = 0;
1107         unsigned char iid;
1108         unsigned long flags;
1109         int next = 1;
1110         u8 msr;
1111
1112         spin_lock_irqsave(&priv->lock, flags);
1113         handled = 0;
1114         while (next) {
1115                 iid = pch_uart_hal_get_iid(priv);
1116                 if (iid & PCH_UART_IIR_IP) /* No Interrupt */
1117                         break;
1118                 switch (iid) {
1119                 case PCH_UART_IID_RLS:  /* Receiver Line Status */
1120                         lsr = pch_uart_hal_get_line_status(priv);
1121                         if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
1122                                                 UART_LSR_PE | UART_LSR_OE)) {
1123                                 pch_uart_err_ir(priv, lsr);
1124                                 ret = PCH_UART_HANDLED_RX_ERR_INT;
1125                         } else {
1126                                 ret = PCH_UART_HANDLED_LS_INT;
1127                         }
1128                         break;
1129                 case PCH_UART_IID_RDR:  /* Received Data Ready */
1130                         if (priv->use_dma) {
1131                                 pch_uart_hal_disable_interrupt(priv,
1132                                                 PCH_UART_HAL_RX_INT |
1133                                                 PCH_UART_HAL_RX_ERR_INT);
1134                                 ret = dma_handle_rx(priv);
1135                                 if (!ret)
1136                                         pch_uart_hal_enable_interrupt(priv,
1137                                                 PCH_UART_HAL_RX_INT |
1138                                                 PCH_UART_HAL_RX_ERR_INT);
1139                         } else {
1140                                 ret = handle_rx(priv);
1141                         }
1142                         break;
1143                 case PCH_UART_IID_RDR_TO:       /* Received Data Ready
1144                                                    (FIFO Timeout) */
1145                         ret = handle_rx_to(priv);
1146                         break;
1147                 case PCH_UART_IID_THRE: /* Transmitter Holding Register
1148                                                    Empty */
1149                         if (priv->use_dma)
1150                                 ret = dma_handle_tx(priv);
1151                         else
1152                                 ret = handle_tx(priv);
1153                         break;
1154                 case PCH_UART_IID_MS:   /* Modem Status */
1155                         msr = pch_uart_hal_get_modem(priv);
1156                         next = 0; /* MS ir prioirty is the lowest. So, MS ir
1157                                      means final interrupt */
1158                         if ((msr & UART_MSR_ANY_DELTA) == 0)
1159                                 break;
1160                         ret |= PCH_UART_HANDLED_MS_INT;
1161                         break;
1162                 default:        /* Never junp to this label */
1163                         dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__,
1164                                 iid, jiffies);
1165                         ret = -1;
1166                         next = 0;
1167                         break;
1168                 }
1169                 handled |= (unsigned int)ret;
1170         }
1171
1172         spin_unlock_irqrestore(&priv->lock, flags);
1173         return IRQ_RETVAL(handled);
1174 }
1175
1176 /* This function tests whether the transmitter fifo and shifter for the port
1177                                                 described by 'port' is empty. */
1178 static unsigned int pch_uart_tx_empty(struct uart_port *port)
1179 {
1180         struct eg20t_port *priv;
1181
1182         priv = container_of(port, struct eg20t_port, port);
1183         if (priv->tx_empty)
1184                 return TIOCSER_TEMT;
1185         else
1186                 return 0;
1187 }
1188
1189 /* Returns the current state of modem control inputs. */
1190 static unsigned int pch_uart_get_mctrl(struct uart_port *port)
1191 {
1192         struct eg20t_port *priv;
1193         u8 modem;
1194         unsigned int ret = 0;
1195
1196         priv = container_of(port, struct eg20t_port, port);
1197         modem = pch_uart_hal_get_modem(priv);
1198
1199         if (modem & UART_MSR_DCD)
1200                 ret |= TIOCM_CAR;
1201
1202         if (modem & UART_MSR_RI)
1203                 ret |= TIOCM_RNG;
1204
1205         if (modem & UART_MSR_DSR)
1206                 ret |= TIOCM_DSR;
1207
1208         if (modem & UART_MSR_CTS)
1209                 ret |= TIOCM_CTS;
1210
1211         return ret;
1212 }
1213
1214 static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1215 {
1216         u32 mcr = 0;
1217         struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
1218
1219         if (mctrl & TIOCM_DTR)
1220                 mcr |= UART_MCR_DTR;
1221         if (mctrl & TIOCM_RTS)
1222                 mcr |= UART_MCR_RTS;
1223         if (mctrl & TIOCM_LOOP)
1224                 mcr |= UART_MCR_LOOP;
1225
1226         if (priv->mcr & UART_MCR_AFE)
1227                 mcr |= UART_MCR_AFE;
1228
1229         if (mctrl)
1230                 iowrite8(mcr, priv->membase + UART_MCR);
1231 }
1232
1233 static void pch_uart_stop_tx(struct uart_port *port)
1234 {
1235         struct eg20t_port *priv;
1236         priv = container_of(port, struct eg20t_port, port);
1237         priv->start_tx = 0;
1238         priv->tx_dma_use = 0;
1239 }
1240
1241 static void pch_uart_start_tx(struct uart_port *port)
1242 {
1243         struct eg20t_port *priv;
1244
1245         priv = container_of(port, struct eg20t_port, port);
1246
1247         if (priv->use_dma) {
1248                 if (priv->tx_dma_use) {
1249                         dev_dbg(priv->port.dev, "%s : Tx DMA is NOT empty.\n",
1250                                 __func__);
1251                         return;
1252                 }
1253         }
1254
1255         priv->start_tx = 1;
1256         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
1257 }
1258
1259 static void pch_uart_stop_rx(struct uart_port *port)
1260 {
1261         struct eg20t_port *priv;
1262         priv = container_of(port, struct eg20t_port, port);
1263         priv->start_rx = 0;
1264         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
1265                                              PCH_UART_HAL_RX_ERR_INT);
1266 }
1267
1268 /* Enable the modem status interrupts. */
1269 static void pch_uart_enable_ms(struct uart_port *port)
1270 {
1271         struct eg20t_port *priv;
1272         priv = container_of(port, struct eg20t_port, port);
1273         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
1274 }
1275
1276 /* Control the transmission of a break signal. */
1277 static void pch_uart_break_ctl(struct uart_port *port, int ctl)
1278 {
1279         struct eg20t_port *priv;
1280         unsigned long flags;
1281
1282         priv = container_of(port, struct eg20t_port, port);
1283         spin_lock_irqsave(&priv->lock, flags);
1284         pch_uart_hal_set_break(priv, ctl);
1285         spin_unlock_irqrestore(&priv->lock, flags);
1286 }
1287
1288 /* Grab any interrupt resources and initialise any low level driver state. */
1289 static int pch_uart_startup(struct uart_port *port)
1290 {
1291         struct eg20t_port *priv;
1292         int ret;
1293         int fifo_size;
1294         int trigger_level;
1295
1296         priv = container_of(port, struct eg20t_port, port);
1297         priv->tx_empty = 1;
1298
1299         if (port->uartclk)
1300                 priv->uartclk = port->uartclk;
1301         else
1302                 port->uartclk = priv->uartclk;
1303
1304         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1305         ret = pch_uart_hal_set_line(priv, default_baud,
1306                               PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
1307                               PCH_UART_HAL_STB1);
1308         if (ret)
1309                 return ret;
1310
1311         switch (priv->fifo_size) {
1312         case 256:
1313                 fifo_size = PCH_UART_HAL_FIFO256;
1314                 break;
1315         case 64:
1316                 fifo_size = PCH_UART_HAL_FIFO64;
1317                 break;
1318         case 16:
1319                 fifo_size = PCH_UART_HAL_FIFO16;
1320                 break;
1321         case 1:
1322         default:
1323                 fifo_size = PCH_UART_HAL_FIFO_DIS;
1324                 break;
1325         }
1326
1327         switch (priv->trigger) {
1328         case PCH_UART_HAL_TRIGGER1:
1329                 trigger_level = 1;
1330                 break;
1331         case PCH_UART_HAL_TRIGGER_L:
1332                 trigger_level = priv->fifo_size / 4;
1333                 break;
1334         case PCH_UART_HAL_TRIGGER_M:
1335                 trigger_level = priv->fifo_size / 2;
1336                 break;
1337         case PCH_UART_HAL_TRIGGER_H:
1338         default:
1339                 trigger_level = priv->fifo_size - (priv->fifo_size / 8);
1340                 break;
1341         }
1342
1343         priv->trigger_level = trigger_level;
1344         ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1345                                     fifo_size, priv->trigger);
1346         if (ret < 0)
1347                 return ret;
1348
1349         ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
1350                         priv->irq_name, priv);
1351         if (ret < 0)
1352                 return ret;
1353
1354         if (priv->use_dma)
1355                 pch_request_dma(port);
1356
1357         priv->start_rx = 1;
1358         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
1359                                             PCH_UART_HAL_RX_ERR_INT);
1360         uart_update_timeout(port, CS8, default_baud);
1361
1362         return 0;
1363 }
1364
1365 static void pch_uart_shutdown(struct uart_port *port)
1366 {
1367         struct eg20t_port *priv;
1368         int ret;
1369
1370         priv = container_of(port, struct eg20t_port, port);
1371         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1372         pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
1373         ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1374                               PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
1375         if (ret)
1376                 dev_err(priv->port.dev,
1377                         "pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);
1378
1379         pch_free_dma(port);
1380
1381         free_irq(priv->port.irq, priv);
1382 }
1383
1384 /* Change the port parameters, including word length, parity, stop
1385  *bits.  Update read_status_mask and ignore_status_mask to indicate
1386  *the types of events we are interested in receiving.  */
1387 static void pch_uart_set_termios(struct uart_port *port,
1388                                  struct ktermios *termios, struct ktermios *old)
1389 {
1390         int rtn;
1391         unsigned int baud, parity, bits, stb;
1392         struct eg20t_port *priv;
1393         unsigned long flags;
1394
1395         priv = container_of(port, struct eg20t_port, port);
1396         switch (termios->c_cflag & CSIZE) {
1397         case CS5:
1398                 bits = PCH_UART_HAL_5BIT;
1399                 break;
1400         case CS6:
1401                 bits = PCH_UART_HAL_6BIT;
1402                 break;
1403         case CS7:
1404                 bits = PCH_UART_HAL_7BIT;
1405                 break;
1406         default:                /* CS8 */
1407                 bits = PCH_UART_HAL_8BIT;
1408                 break;
1409         }
1410         if (termios->c_cflag & CSTOPB)
1411                 stb = PCH_UART_HAL_STB2;
1412         else
1413                 stb = PCH_UART_HAL_STB1;
1414
1415         if (termios->c_cflag & PARENB) {
1416                 if (termios->c_cflag & PARODD)
1417                         parity = PCH_UART_HAL_PARITY_ODD;
1418                 else
1419                         parity = PCH_UART_HAL_PARITY_EVEN;
1420
1421         } else
1422                 parity = PCH_UART_HAL_PARITY_NONE;
1423
1424         /* Only UART0 has auto hardware flow function */
1425         if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256))
1426                 priv->mcr |= UART_MCR_AFE;
1427         else
1428                 priv->mcr &= ~UART_MCR_AFE;
1429
1430         termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
1431
1432         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
1433
1434         spin_lock_irqsave(&priv->lock, flags);
1435         spin_lock(&port->lock);
1436
1437         uart_update_timeout(port, termios->c_cflag, baud);
1438         rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
1439         if (rtn)
1440                 goto out;
1441
1442         pch_uart_set_mctrl(&priv->port, priv->port.mctrl);
1443         /* Don't rewrite B0 */
1444         if (tty_termios_baud_rate(termios))
1445                 tty_termios_encode_baud_rate(termios, baud, baud);
1446
1447 out:
1448         spin_unlock(&port->lock);
1449         spin_unlock_irqrestore(&priv->lock, flags);
1450 }
1451
1452 static const char *pch_uart_type(struct uart_port *port)
1453 {
1454         return KBUILD_MODNAME;
1455 }
1456
1457 static void pch_uart_release_port(struct uart_port *port)
1458 {
1459         struct eg20t_port *priv;
1460
1461         priv = container_of(port, struct eg20t_port, port);
1462         pci_iounmap(priv->pdev, priv->membase);
1463         pci_release_regions(priv->pdev);
1464 }
1465
1466 static int pch_uart_request_port(struct uart_port *port)
1467 {
1468         struct eg20t_port *priv;
1469         int ret;
1470         void __iomem *membase;
1471
1472         priv = container_of(port, struct eg20t_port, port);
1473         ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
1474         if (ret < 0)
1475                 return -EBUSY;
1476
1477         membase = pci_iomap(priv->pdev, 1, 0);
1478         if (!membase) {
1479                 pci_release_regions(priv->pdev);
1480                 return -EBUSY;
1481         }
1482         priv->membase = port->membase = membase;
1483
1484         return 0;
1485 }
1486
1487 static void pch_uart_config_port(struct uart_port *port, int type)
1488 {
1489         struct eg20t_port *priv;
1490
1491         priv = container_of(port, struct eg20t_port, port);
1492         if (type & UART_CONFIG_TYPE) {
1493                 port->type = priv->port_type;
1494                 pch_uart_request_port(port);
1495         }
1496 }
1497
1498 static int pch_uart_verify_port(struct uart_port *port,
1499                                 struct serial_struct *serinfo)
1500 {
1501         struct eg20t_port *priv;
1502
1503         priv = container_of(port, struct eg20t_port, port);
1504         if (serinfo->flags & UPF_LOW_LATENCY) {
1505                 dev_info(priv->port.dev,
1506                         "PCH UART : Use PIO Mode (without DMA)\n");
1507                 priv->use_dma = 0;
1508                 serinfo->flags &= ~UPF_LOW_LATENCY;
1509         } else {
1510 #ifndef CONFIG_PCH_DMA
1511                 dev_err(priv->port.dev, "%s : PCH DMA is not Loaded.\n",
1512                         __func__);
1513                 return -EOPNOTSUPP;
1514 #endif
1515                 if (!priv->use_dma) {
1516                         pch_request_dma(port);
1517                         if (priv->chan_rx)
1518                                 priv->use_dma = 1;
1519                 }
1520                 dev_info(priv->port.dev, "PCH UART: %s\n",
1521                                 priv->use_dma ?
1522                                 "Use DMA Mode" : "No DMA");
1523         }
1524
1525         return 0;
1526 }
1527
1528 #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_PCH_UART_CONSOLE)
1529 /*
1530  *      Wait for transmitter & holding register to empty
1531  */
1532 static void wait_for_xmitr(struct eg20t_port *up, int bits)
1533 {
1534         unsigned int status, tmout = 10000;
1535
1536         /* Wait up to 10ms for the character(s) to be sent. */
1537         for (;;) {
1538                 status = ioread8(up->membase + UART_LSR);
1539
1540                 if ((status & bits) == bits)
1541                         break;
1542                 if (--tmout == 0)
1543                         break;
1544                 udelay(1);
1545         }
1546
1547         /* Wait up to 1s for flow control if necessary */
1548         if (up->port.flags & UPF_CONS_FLOW) {
1549                 unsigned int tmout;
1550                 for (tmout = 1000000; tmout; tmout--) {
1551                         unsigned int msr = ioread8(up->membase + UART_MSR);
1552                         if (msr & UART_MSR_CTS)
1553                                 break;
1554                         udelay(1);
1555                         touch_nmi_watchdog();
1556                 }
1557         }
1558 }
1559 #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_PCH_UART_CONSOLE */
1560
1561 #ifdef CONFIG_CONSOLE_POLL
1562 /*
1563  * Console polling routines for communicate via uart while
1564  * in an interrupt or debug context.
1565  */
1566 static int pch_uart_get_poll_char(struct uart_port *port)
1567 {
1568         struct eg20t_port *priv =
1569                 container_of(port, struct eg20t_port, port);
1570         u8 lsr = ioread8(priv->membase + UART_LSR);
1571
1572         if (!(lsr & UART_LSR_DR))
1573                 return NO_POLL_CHAR;
1574
1575         return ioread8(priv->membase + PCH_UART_RBR);
1576 }
1577
1578
1579 static void pch_uart_put_poll_char(struct uart_port *port,
1580                          unsigned char c)
1581 {
1582         unsigned int ier;
1583         struct eg20t_port *priv =
1584                 container_of(port, struct eg20t_port, port);
1585
1586         /*
1587          * First save the IER then disable the interrupts
1588          */
1589         ier = ioread8(priv->membase + UART_IER);
1590         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1591
1592         wait_for_xmitr(priv, UART_LSR_THRE);
1593         /*
1594          * Send the character out.
1595          */
1596         iowrite8(c, priv->membase + PCH_UART_THR);
1597
1598         /*
1599          * Finally, wait for transmitter to become empty
1600          * and restore the IER
1601          */
1602         wait_for_xmitr(priv, BOTH_EMPTY);
1603         iowrite8(ier, priv->membase + UART_IER);
1604 }
1605 #endif /* CONFIG_CONSOLE_POLL */
1606
1607 static struct uart_ops pch_uart_ops = {
1608         .tx_empty = pch_uart_tx_empty,
1609         .set_mctrl = pch_uart_set_mctrl,
1610         .get_mctrl = pch_uart_get_mctrl,
1611         .stop_tx = pch_uart_stop_tx,
1612         .start_tx = pch_uart_start_tx,
1613         .stop_rx = pch_uart_stop_rx,
1614         .enable_ms = pch_uart_enable_ms,
1615         .break_ctl = pch_uart_break_ctl,
1616         .startup = pch_uart_startup,
1617         .shutdown = pch_uart_shutdown,
1618         .set_termios = pch_uart_set_termios,
1619 /*      .pm             = pch_uart_pm,          Not supported yet */
1620         .type = pch_uart_type,
1621         .release_port = pch_uart_release_port,
1622         .request_port = pch_uart_request_port,
1623         .config_port = pch_uart_config_port,
1624         .verify_port = pch_uart_verify_port,
1625 #ifdef CONFIG_CONSOLE_POLL
1626         .poll_get_char = pch_uart_get_poll_char,
1627         .poll_put_char = pch_uart_put_poll_char,
1628 #endif
1629 };
1630
1631 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1632
1633 static void pch_console_putchar(struct uart_port *port, int ch)
1634 {
1635         struct eg20t_port *priv =
1636                 container_of(port, struct eg20t_port, port);
1637
1638         wait_for_xmitr(priv, UART_LSR_THRE);
1639         iowrite8(ch, priv->membase + PCH_UART_THR);
1640 }
1641
1642 /*
1643  *      Print a string to the serial port trying not to disturb
1644  *      any possible real use of the port...
1645  *
1646  *      The console_lock must be held when we get here.
1647  */
1648 static void
1649 pch_console_write(struct console *co, const char *s, unsigned int count)
1650 {
1651         struct eg20t_port *priv;
1652         unsigned long flags;
1653         int priv_locked = 1;
1654         int port_locked = 1;
1655         u8 ier;
1656
1657         priv = pch_uart_ports[co->index];
1658
1659         touch_nmi_watchdog();
1660
1661         local_irq_save(flags);
1662         if (priv->port.sysrq) {
1663                 /* call to uart_handle_sysrq_char already took the priv lock */
1664                 priv_locked = 0;
1665                 /* serial8250_handle_port() already took the port lock */
1666                 port_locked = 0;
1667         } else if (oops_in_progress) {
1668                 priv_locked = spin_trylock(&priv->lock);
1669                 port_locked = spin_trylock(&priv->port.lock);
1670         } else {
1671                 spin_lock(&priv->lock);
1672                 spin_lock(&priv->port.lock);
1673         }
1674
1675         /*
1676          *      First save the IER then disable the interrupts
1677          */
1678         ier = ioread8(priv->membase + UART_IER);
1679
1680         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1681
1682         uart_console_write(&priv->port, s, count, pch_console_putchar);
1683
1684         /*
1685          *      Finally, wait for transmitter to become empty
1686          *      and restore the IER
1687          */
1688         wait_for_xmitr(priv, BOTH_EMPTY);
1689         iowrite8(ier, priv->membase + UART_IER);
1690
1691         if (port_locked)
1692                 spin_unlock(&priv->port.lock);
1693         if (priv_locked)
1694                 spin_unlock(&priv->lock);
1695         local_irq_restore(flags);
1696 }
1697
1698 static int __init pch_console_setup(struct console *co, char *options)
1699 {
1700         struct uart_port *port;
1701         int baud = default_baud;
1702         int bits = 8;
1703         int parity = 'n';
1704         int flow = 'n';
1705
1706         /*
1707          * Check whether an invalid uart number has been specified, and
1708          * if so, search for the first available port that does have
1709          * console support.
1710          */
1711         if (co->index >= PCH_UART_NR)
1712                 co->index = 0;
1713         port = &pch_uart_ports[co->index]->port;
1714
1715         if (!port || (!port->iobase && !port->membase))
1716                 return -ENODEV;
1717
1718         port->uartclk = pch_uart_get_uartclk();
1719
1720         if (options)
1721                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1722
1723         return uart_set_options(port, co, baud, parity, bits, flow);
1724 }
1725
1726 static struct uart_driver pch_uart_driver;
1727
1728 static struct console pch_console = {
1729         .name           = PCH_UART_DRIVER_DEVICE,
1730         .write          = pch_console_write,
1731         .device         = uart_console_device,
1732         .setup          = pch_console_setup,
1733         .flags          = CON_PRINTBUFFER | CON_ANYTIME,
1734         .index          = -1,
1735         .data           = &pch_uart_driver,
1736 };
1737
1738 #define PCH_CONSOLE     (&pch_console)
1739 #else
1740 #define PCH_CONSOLE     NULL
1741 #endif  /* CONFIG_SERIAL_PCH_UART_CONSOLE */
1742
1743 static struct uart_driver pch_uart_driver = {
1744         .owner = THIS_MODULE,
1745         .driver_name = KBUILD_MODNAME,
1746         .dev_name = PCH_UART_DRIVER_DEVICE,
1747         .major = 0,
1748         .minor = 0,
1749         .nr = PCH_UART_NR,
1750         .cons = PCH_CONSOLE,
1751 };
1752
1753 static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
1754                                              const struct pci_device_id *id)
1755 {
1756         struct eg20t_port *priv;
1757         int ret;
1758         unsigned int iobase;
1759         unsigned int mapbase;
1760         unsigned char *rxbuf;
1761         int fifosize;
1762         int port_type;
1763         struct pch_uart_driver_data *board;
1764 #ifdef CONFIG_DEBUG_FS
1765         char name[32];  /* for debugfs file name */
1766 #endif
1767
1768         board = &drv_dat[id->driver_data];
1769         port_type = board->port_type;
1770
1771         priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
1772         if (priv == NULL)
1773                 goto init_port_alloc_err;
1774
1775         rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1776         if (!rxbuf)
1777                 goto init_port_free_txbuf;
1778
1779         switch (port_type) {
1780         case PORT_UNKNOWN:
1781                 fifosize = 256; /* EG20T/ML7213: UART0 */
1782                 break;
1783         case PORT_8250:
1784                 fifosize = 64; /* EG20T:UART1~3  ML7213: UART1~2*/
1785                 break;
1786         default:
1787                 dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
1788                 goto init_port_hal_free;
1789         }
1790
1791         pci_enable_msi(pdev);
1792         pci_set_master(pdev);
1793
1794         spin_lock_init(&priv->lock);
1795
1796         iobase = pci_resource_start(pdev, 0);
1797         mapbase = pci_resource_start(pdev, 1);
1798         priv->mapbase = mapbase;
1799         priv->iobase = iobase;
1800         priv->pdev = pdev;
1801         priv->tx_empty = 1;
1802         priv->rxbuf.buf = rxbuf;
1803         priv->rxbuf.size = PAGE_SIZE;
1804
1805         priv->fifo_size = fifosize;
1806         priv->uartclk = pch_uart_get_uartclk();
1807         priv->port_type = PORT_MAX_8250 + port_type + 1;
1808         priv->port.dev = &pdev->dev;
1809         priv->port.iobase = iobase;
1810         priv->port.membase = NULL;
1811         priv->port.mapbase = mapbase;
1812         priv->port.irq = pdev->irq;
1813         priv->port.iotype = UPIO_PORT;
1814         priv->port.ops = &pch_uart_ops;
1815         priv->port.flags = UPF_BOOT_AUTOCONF;
1816         priv->port.fifosize = fifosize;
1817         priv->port.line = board->line_no;
1818         priv->trigger = PCH_UART_HAL_TRIGGER_M;
1819
1820         snprintf(priv->irq_name, IRQ_NAME_SIZE,
1821                  KBUILD_MODNAME ":" PCH_UART_DRIVER_DEVICE "%d",
1822                  priv->port.line);
1823
1824         spin_lock_init(&priv->port.lock);
1825
1826         pci_set_drvdata(pdev, priv);
1827         priv->trigger_level = 1;
1828         priv->fcr = 0;
1829
1830         if (pdev->dev.of_node)
1831                 of_property_read_u32(pdev->dev.of_node, "clock-frequency"
1832                                          , &user_uartclk);
1833
1834 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1835         pch_uart_ports[board->line_no] = priv;
1836 #endif
1837         ret = uart_add_one_port(&pch_uart_driver, &priv->port);
1838         if (ret < 0)
1839                 goto init_port_hal_free;
1840
1841 #ifdef CONFIG_DEBUG_FS
1842         snprintf(name, sizeof(name), "uart%d_regs", board->line_no);
1843         priv->debugfs = debugfs_create_file(name, S_IFREG | S_IRUGO,
1844                                 NULL, priv, &port_regs_ops);
1845 #endif
1846
1847         return priv;
1848
1849 init_port_hal_free:
1850 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1851         pch_uart_ports[board->line_no] = NULL;
1852 #endif
1853         free_page((unsigned long)rxbuf);
1854 init_port_free_txbuf:
1855         kfree(priv);
1856 init_port_alloc_err:
1857
1858         return NULL;
1859 }
1860
1861 static void pch_uart_exit_port(struct eg20t_port *priv)
1862 {
1863
1864 #ifdef CONFIG_DEBUG_FS
1865         if (priv->debugfs)
1866                 debugfs_remove(priv->debugfs);
1867 #endif
1868         uart_remove_one_port(&pch_uart_driver, &priv->port);
1869         free_page((unsigned long)priv->rxbuf.buf);
1870 }
1871
1872 static void pch_uart_pci_remove(struct pci_dev *pdev)
1873 {
1874         struct eg20t_port *priv = pci_get_drvdata(pdev);
1875
1876         pci_disable_msi(pdev);
1877
1878 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1879         pch_uart_ports[priv->port.line] = NULL;
1880 #endif
1881         pch_uart_exit_port(priv);
1882         pci_disable_device(pdev);
1883         kfree(priv);
1884         return;
1885 }
1886 #ifdef CONFIG_PM
1887 static int pch_uart_pci_suspend(struct pci_dev *pdev, pm_message_t state)
1888 {
1889         struct eg20t_port *priv = pci_get_drvdata(pdev);
1890
1891         uart_suspend_port(&pch_uart_driver, &priv->port);
1892
1893         pci_save_state(pdev);
1894         pci_set_power_state(pdev, pci_choose_state(pdev, state));
1895         return 0;
1896 }
1897
1898 static int pch_uart_pci_resume(struct pci_dev *pdev)
1899 {
1900         struct eg20t_port *priv = pci_get_drvdata(pdev);
1901         int ret;
1902
1903         pci_set_power_state(pdev, PCI_D0);
1904         pci_restore_state(pdev);
1905
1906         ret = pci_enable_device(pdev);
1907         if (ret) {
1908                 dev_err(&pdev->dev,
1909                 "%s-pci_enable_device failed(ret=%d) ", __func__, ret);
1910                 return ret;
1911         }
1912
1913         uart_resume_port(&pch_uart_driver, &priv->port);
1914
1915         return 0;
1916 }
1917 #else
1918 #define pch_uart_pci_suspend NULL
1919 #define pch_uart_pci_resume NULL
1920 #endif
1921
1922 static const struct pci_device_id pch_uart_pci_id[] = {
1923         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
1924          .driver_data = pch_et20t_uart0},
1925         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
1926          .driver_data = pch_et20t_uart1},
1927         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
1928          .driver_data = pch_et20t_uart2},
1929         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
1930          .driver_data = pch_et20t_uart3},
1931         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
1932          .driver_data = pch_ml7213_uart0},
1933         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
1934          .driver_data = pch_ml7213_uart1},
1935         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
1936          .driver_data = pch_ml7213_uart2},
1937         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C),
1938          .driver_data = pch_ml7223_uart0},
1939         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D),
1940          .driver_data = pch_ml7223_uart1},
1941         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8811),
1942          .driver_data = pch_ml7831_uart0},
1943         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8812),
1944          .driver_data = pch_ml7831_uart1},
1945         {0,},
1946 };
1947
1948 static int pch_uart_pci_probe(struct pci_dev *pdev,
1949                                         const struct pci_device_id *id)
1950 {
1951         int ret;
1952         struct eg20t_port *priv;
1953
1954         ret = pci_enable_device(pdev);
1955         if (ret < 0)
1956                 goto probe_error;
1957
1958         priv = pch_uart_init_port(pdev, id);
1959         if (!priv) {
1960                 ret = -EBUSY;
1961                 goto probe_disable_device;
1962         }
1963         pci_set_drvdata(pdev, priv);
1964
1965         return ret;
1966
1967 probe_disable_device:
1968         pci_disable_msi(pdev);
1969         pci_disable_device(pdev);
1970 probe_error:
1971         return ret;
1972 }
1973
1974 static struct pci_driver pch_uart_pci_driver = {
1975         .name = "pch_uart",
1976         .id_table = pch_uart_pci_id,
1977         .probe = pch_uart_pci_probe,
1978         .remove = pch_uart_pci_remove,
1979         .suspend = pch_uart_pci_suspend,
1980         .resume = pch_uart_pci_resume,
1981 };
1982
1983 static int __init pch_uart_module_init(void)
1984 {
1985         int ret;
1986
1987         /* register as UART driver */
1988         ret = uart_register_driver(&pch_uart_driver);
1989         if (ret < 0)
1990                 return ret;
1991
1992         /* register as PCI driver */
1993         ret = pci_register_driver(&pch_uart_pci_driver);
1994         if (ret < 0)
1995                 uart_unregister_driver(&pch_uart_driver);
1996
1997         return ret;
1998 }
1999 module_init(pch_uart_module_init);
2000
2001 static void __exit pch_uart_module_exit(void)
2002 {
2003         pci_unregister_driver(&pch_uart_pci_driver);
2004         uart_unregister_driver(&pch_uart_driver);
2005 }
2006 module_exit(pch_uart_module_exit);
2007
2008 MODULE_LICENSE("GPL v2");
2009 MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
2010 MODULE_DEVICE_TABLE(pci, pch_uart_pci_id);
2011
2012 module_param(default_baud, uint, S_IRUGO);
2013 MODULE_PARM_DESC(default_baud,
2014                  "Default BAUD for initial driver state and console (default 9600)");
2015 module_param(user_uartclk, uint, S_IRUGO);
2016 MODULE_PARM_DESC(user_uartclk,
2017                  "Override UART default or board specific UART clock");