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