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 #include <linux/kernel.h>
  18 #include <linux/serial_reg.h>
  19 #include <linux/slab.h>
  20 #include <linux/module.h>
  21 #include <linux/pci.h>
  22 #include <linux/serial_core.h>
  23 #include <linux/tty.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/io.h>
  27 #include <linux/dmi.h>
  28 #include <linux/console.h>
  29 #include <linux/nmi.h>
  30 #include <linux/delay.h>
  31
  32 #include <linux/debugfs.h>
  33 #include <linux/dmaengine.h>
  34 #include <linux/pch_dma.h>
  35
  36 enum {
  37         PCH_UART_HANDLED_RX_INT_SHIFT,
  38         PCH_UART_HANDLED_TX_INT_SHIFT,
  39         PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
  40         PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
  41         PCH_UART_HANDLED_MS_INT_SHIFT,
  42         PCH_UART_HANDLED_LS_INT_SHIFT,
  43 };
  44
  45 enum {
  46         PCH_UART_8LINE,
  47         PCH_UART_2LINE,
  48 };
  49
  50 #define PCH_UART_DRIVER_DEVICE "ttyPCH"
  51
  52 /* Set the max number of UART port
  53  * Intel EG20T PCH: 4 port
  54  * LAPIS Semiconductor ML7213 IOH: 3 port
  55  * LAPIS Semiconductor ML7223 IOH: 2 port
  56 */
  57 #define PCH_UART_NR     4
  58
  59 #define PCH_UART_HANDLED_RX_INT (1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
  60 #define PCH_UART_HANDLED_TX_INT (1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
  61 #define PCH_UART_HANDLED_RX_ERR_INT     (1<<((\
  62                                         PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1))
  63 #define PCH_UART_HANDLED_RX_TRG_INT     (1<<((\
  64                                         PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1))
  65 #define PCH_UART_HANDLED_MS_INT (1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1))
  66
  67 #define PCH_UART_HANDLED_LS_INT (1<<((PCH_UART_HANDLED_LS_INT_SHIFT)<<1))
  68
  69 #define PCH_UART_RBR            0x00
  70 #define PCH_UART_THR            0x00
  71
  72 #define PCH_UART_IER_MASK       (PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\
  73                                 PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI)
  74 #define PCH_UART_IER_ERBFI      0x00000001
  75 #define PCH_UART_IER_ETBEI      0x00000002
  76 #define PCH_UART_IER_ELSI       0x00000004
  77 #define PCH_UART_IER_EDSSI      0x00000008
  78
  79 #define PCH_UART_IIR_IP                 0x00000001
  80 #define PCH_UART_IIR_IID                0x00000006
  81 #define PCH_UART_IIR_MSI                0x00000000
  82 #define PCH_UART_IIR_TRI                0x00000002
  83 #define PCH_UART_IIR_RRI                0x00000004
  84 #define PCH_UART_IIR_REI                0x00000006
  85 #define PCH_UART_IIR_TOI                0x00000008
  86 #define PCH_UART_IIR_FIFO256            0x00000020
  87 #define PCH_UART_IIR_FIFO64             PCH_UART_IIR_FIFO256
  88 #define PCH_UART_IIR_FE                 0x000000C0
  89
  90 #define PCH_UART_FCR_FIFOE              0x00000001
  91 #define PCH_UART_FCR_RFR                0x00000002
  92 #define PCH_UART_FCR_TFR                0x00000004
  93 #define PCH_UART_FCR_DMS                0x00000008
  94 #define PCH_UART_FCR_FIFO256            0x00000020
  95 #define PCH_UART_FCR_RFTL               0x000000C0
  96
  97 #define PCH_UART_FCR_RFTL1              0x00000000
  98 #define PCH_UART_FCR_RFTL64             0x00000040
  99 #define PCH_UART_FCR_RFTL128            0x00000080
 100 #define PCH_UART_FCR_RFTL224            0x000000C0
 101 #define PCH_UART_FCR_RFTL16             PCH_UART_FCR_RFTL64
 102 #define PCH_UART_FCR_RFTL32             PCH_UART_FCR_RFTL128
 103 #define PCH_UART_FCR_RFTL56             PCH_UART_FCR_RFTL224
 104 #define PCH_UART_FCR_RFTL4              PCH_UART_FCR_RFTL64
 105 #define PCH_UART_FCR_RFTL8              PCH_UART_FCR_RFTL128
 106 #define PCH_UART_FCR_RFTL14             PCH_UART_FCR_RFTL224
 107 #define PCH_UART_FCR_RFTL_SHIFT         6
 108
 109 #define PCH_UART_LCR_WLS        0x00000003
 110 #define PCH_UART_LCR_STB        0x00000004
 111 #define PCH_UART_LCR_PEN        0x00000008
 112 #define PCH_UART_LCR_EPS        0x00000010
 113 #define PCH_UART_LCR_SP         0x00000020
 114 #define PCH_UART_LCR_SB         0x00000040
 115 #define PCH_UART_LCR_DLAB       0x00000080
 116 #define PCH_UART_LCR_NP         0x00000000
 117 #define PCH_UART_LCR_OP         PCH_UART_LCR_PEN
 118 #define PCH_UART_LCR_EP         (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS)
 119 #define PCH_UART_LCR_1P         (PCH_UART_LCR_PEN | PCH_UART_LCR_SP)
 120 #define PCH_UART_LCR_0P         (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS |\
 121                                 PCH_UART_LCR_SP)
 122
 123 #define PCH_UART_LCR_5BIT       0x00000000
 124 #define PCH_UART_LCR_6BIT       0x00000001
 125 #define PCH_UART_LCR_7BIT       0x00000002
 126 #define PCH_UART_LCR_8BIT       0x00000003
 127
 128 #define PCH_UART_MCR_DTR        0x00000001
 129 #define PCH_UART_MCR_RTS        0x00000002
 130 #define PCH_UART_MCR_OUT        0x0000000C
 131 #define PCH_UART_MCR_LOOP       0x00000010
 132 #define PCH_UART_MCR_AFE        0x00000020
 133
 134 #define PCH_UART_LSR_DR         0x00000001
 135 #define PCH_UART_LSR_ERR        (1<<7)
 136
 137 #define PCH_UART_MSR_DCTS       0x00000001
 138 #define PCH_UART_MSR_DDSR       0x00000002
 139 #define PCH_UART_MSR_TERI       0x00000004
 140 #define PCH_UART_MSR_DDCD       0x00000008
 141 #define PCH_UART_MSR_CTS        0x00000010
 142 #define PCH_UART_MSR_DSR        0x00000020
 143 #define PCH_UART_MSR_RI         0x00000040
 144 #define PCH_UART_MSR_DCD        0x00000080
 145 #define PCH_UART_MSR_DELTA      (PCH_UART_MSR_DCTS | PCH_UART_MSR_DDSR |\
 146                                 PCH_UART_MSR_TERI | PCH_UART_MSR_DDCD)
 147
 148 #define PCH_UART_DLL            0x00
 149 #define PCH_UART_DLM            0x01
 150
 151 #define PCH_UART_BRCSR          0x0E
 152
 153 #define PCH_UART_IID_RLS        (PCH_UART_IIR_REI)
 154 #define PCH_UART_IID_RDR        (PCH_UART_IIR_RRI)
 155 #define PCH_UART_IID_RDR_TO     (PCH_UART_IIR_RRI | PCH_UART_IIR_TOI)
 156 #define PCH_UART_IID_THRE       (PCH_UART_IIR_TRI)
 157 #define PCH_UART_IID_MS         (PCH_UART_IIR_MSI)
 158
 159 #define PCH_UART_HAL_PARITY_NONE        (PCH_UART_LCR_NP)
 160 #define PCH_UART_HAL_PARITY_ODD         (PCH_UART_LCR_OP)
 161 #define PCH_UART_HAL_PARITY_EVEN        (PCH_UART_LCR_EP)
 162 #define PCH_UART_HAL_PARITY_FIX1        (PCH_UART_LCR_1P)
 163 #define PCH_UART_HAL_PARITY_FIX0        (PCH_UART_LCR_0P)
 164 #define PCH_UART_HAL_5BIT               (PCH_UART_LCR_5BIT)
 165 #define PCH_UART_HAL_6BIT               (PCH_UART_LCR_6BIT)
 166 #define PCH_UART_HAL_7BIT               (PCH_UART_LCR_7BIT)
 167 #define PCH_UART_HAL_8BIT               (PCH_UART_LCR_8BIT)
 168 #define PCH_UART_HAL_STB1               0
 169 #define PCH_UART_HAL_STB2               (PCH_UART_LCR_STB)
 170
 171 #define PCH_UART_HAL_CLR_TX_FIFO        (PCH_UART_FCR_TFR)
 172 #define PCH_UART_HAL_CLR_RX_FIFO        (PCH_UART_FCR_RFR)
 173 #define PCH_UART_HAL_CLR_ALL_FIFO       (PCH_UART_HAL_CLR_TX_FIFO | \
 174                                         PCH_UART_HAL_CLR_RX_FIFO)
 175
 176 #define PCH_UART_HAL_DMA_MODE0          0
 177 #define PCH_UART_HAL_FIFO_DIS           0
 178 #define PCH_UART_HAL_FIFO16             (PCH_UART_FCR_FIFOE)
 179 #define PCH_UART_HAL_FIFO256            (PCH_UART_FCR_FIFOE | \
 180                                         PCH_UART_FCR_FIFO256)
 181 #define PCH_UART_HAL_FIFO64             (PCH_UART_HAL_FIFO256)
 182 #define PCH_UART_HAL_TRIGGER1           (PCH_UART_FCR_RFTL1)
 183 #define PCH_UART_HAL_TRIGGER64          (PCH_UART_FCR_RFTL64)
 184 #define PCH_UART_HAL_TRIGGER128         (PCH_UART_FCR_RFTL128)
 185 #define PCH_UART_HAL_TRIGGER224         (PCH_UART_FCR_RFTL224)
 186 #define PCH_UART_HAL_TRIGGER16          (PCH_UART_FCR_RFTL16)
 187 #define PCH_UART_HAL_TRIGGER32          (PCH_UART_FCR_RFTL32)
 188 #define PCH_UART_HAL_TRIGGER56          (PCH_UART_FCR_RFTL56)
 189 #define PCH_UART_HAL_TRIGGER4           (PCH_UART_FCR_RFTL4)
 190 #define PCH_UART_HAL_TRIGGER8           (PCH_UART_FCR_RFTL8)
 191 #define PCH_UART_HAL_TRIGGER14          (PCH_UART_FCR_RFTL14)
 192 #define PCH_UART_HAL_TRIGGER_L          (PCH_UART_FCR_RFTL64)
 193 #define PCH_UART_HAL_TRIGGER_M          (PCH_UART_FCR_RFTL128)
 194 #define PCH_UART_HAL_TRIGGER_H          (PCH_UART_FCR_RFTL224)
 195
 196 #define PCH_UART_HAL_RX_INT             (PCH_UART_IER_ERBFI)
 197 #define PCH_UART_HAL_TX_INT             (PCH_UART_IER_ETBEI)
 198 #define PCH_UART_HAL_RX_ERR_INT         (PCH_UART_IER_ELSI)
 199 #define PCH_UART_HAL_MS_INT             (PCH_UART_IER_EDSSI)
 200 #define PCH_UART_HAL_ALL_INT            (PCH_UART_IER_MASK)
 201
 202 #define PCH_UART_HAL_DTR                (PCH_UART_MCR_DTR)
 203 #define PCH_UART_HAL_RTS                (PCH_UART_MCR_RTS)
 204 #define PCH_UART_HAL_OUT                (PCH_UART_MCR_OUT)
 205 #define PCH_UART_HAL_LOOP               (PCH_UART_MCR_LOOP)
 206 #define PCH_UART_HAL_AFE                (PCH_UART_MCR_AFE)
 207
 208 #define PCI_VENDOR_ID_ROHM              0x10DB
 209
 210 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
 211
 212 #define DEFAULT_UARTCLK   1843200 /*   1.8432 MHz */
 213 #define CMITC_UARTCLK   192000000 /* 192.0000 MHz */
 214 #define FRI2_64_UARTCLK  64000000 /*  64.0000 MHz */
 215 #define FRI2_48_UARTCLK  48000000 /*  48.0000 MHz */
 216 #define NTC1_UARTCLK     64000000 /*  64.0000 MHz */
 217
 218 struct pch_uart_buffer {
 219         unsigned char *buf;
 220         int size;
 221 };
 222
 223 struct eg20t_port {
 224         struct uart_port port;
 225         int port_type;
 226         void __iomem *membase;
 227         resource_size_t mapbase;
 228         unsigned int iobase;
 229         struct pci_dev *pdev;
 230         int fifo_size;
 231         int uartclk;
 232         int start_tx;
 233         int start_rx;
 234         int tx_empty;
 235         int trigger;
 236         int trigger_level;
 237         struct pch_uart_buffer rxbuf;
 238         unsigned int dmsr;
 239         unsigned int fcr;
 240         unsigned int mcr;
 241         unsigned int use_dma;
 242         struct dma_async_tx_descriptor  *desc_tx;
 243         struct dma_async_tx_descriptor  *desc_rx;
 244         struct pch_dma_slave            param_tx;
 245         struct pch_dma_slave            param_rx;
 246         struct dma_chan                 *chan_tx;
 247         struct dma_chan                 *chan_rx;
 248         struct scatterlist              *sg_tx_p;
 249         int                             nent;
 250         struct scatterlist              sg_rx;
 251         int                             tx_dma_use;
 252         void                            *rx_buf_virt;
 253         dma_addr_t                      rx_buf_dma;
 254
 255         struct dentry   *debugfs;
 256
 257         /* protect the eg20t_port private structure and io access to membase */
 258         spinlock_t lock;
 259 };
 260
 261 /**
 262  * struct pch_uart_driver_data - private data structure for UART-DMA
 263  * @port_type:                  The number of DMA channel
 264  * @line_no:                    UART port line number (0, 1, 2...)
 265  */
 266 struct pch_uart_driver_data {
 267         int port_type;
 268         int line_no;
 269 };
 270
 271 enum pch_uart_num_t {
 272         pch_et20t_uart0 = 0,
 273         pch_et20t_uart1,
 274         pch_et20t_uart2,
 275         pch_et20t_uart3,
 276         pch_ml7213_uart0,
 277         pch_ml7213_uart1,
 278         pch_ml7213_uart2,
 279         pch_ml7223_uart0,
 280         pch_ml7223_uart1,
 281         pch_ml7831_uart0,
 282         pch_ml7831_uart1,
 283 };
 284
 285 static struct pch_uart_driver_data drv_dat[] = {
 286         [pch_et20t_uart0] = {PCH_UART_8LINE, 0},
 287         [pch_et20t_uart1] = {PCH_UART_2LINE, 1},
 288         [pch_et20t_uart2] = {PCH_UART_2LINE, 2},
 289         [pch_et20t_uart3] = {PCH_UART_2LINE, 3},
 290         [pch_ml7213_uart0] = {PCH_UART_8LINE, 0},
 291         [pch_ml7213_uart1] = {PCH_UART_2LINE, 1},
 292         [pch_ml7213_uart2] = {PCH_UART_2LINE, 2},
 293         [pch_ml7223_uart0] = {PCH_UART_8LINE, 0},
 294         [pch_ml7223_uart1] = {PCH_UART_2LINE, 1},
 295         [pch_ml7831_uart0] = {PCH_UART_8LINE, 0},
 296         [pch_ml7831_uart1] = {PCH_UART_2LINE, 1},
 297 };
 298
 299 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
 300 static struct eg20t_port *pch_uart_ports[PCH_UART_NR];
 301 #endif
 302 static unsigned int default_baud = 9600;
 303 static unsigned int user_uartclk = 0;
 304 static const int trigger_level_256[4] = { 1, 64, 128, 224 };
 305 static const int trigger_level_64[4] = { 1, 16, 32, 56 };
 306 static const int trigger_level_16[4] = { 1, 4, 8, 14 };
 307 static const int trigger_level_1[4] = { 1, 1, 1, 1 };
 308
 309 #ifdef CONFIG_DEBUG_FS
 310
 311 #define PCH_REGS_BUFSIZE        1024
 312
 313
 314 static ssize_t port_show_regs(struct file *file, char __user *user_buf,
 315                                 size_t count, loff_t *ppos)
 316 {
 317         struct eg20t_port *priv = file->private_data;
 318         char *buf;
 319         u32 len = 0;
 320         ssize_t ret;
 321         unsigned char lcr;
 322
 323         buf = kzalloc(PCH_REGS_BUFSIZE, GFP_KERNEL);
 324         if (!buf)
 325                 return 0;
 326
 327         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 328                         "PCH EG20T port[%d] regs:\n", priv->port.line);
 329
 330         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 331                         "=================================\n");
 332         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 333                         "IER: \t0x%02x\n", ioread8(priv->membase + UART_IER));
 334         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 335                         "IIR: \t0x%02x\n", ioread8(priv->membase + UART_IIR));
 336         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 337                         "LCR: \t0x%02x\n", ioread8(priv->membase + UART_LCR));
 338         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 339                         "MCR: \t0x%02x\n", ioread8(priv->membase + UART_MCR));
 340         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 341                         "LSR: \t0x%02x\n", ioread8(priv->membase + UART_LSR));
 342         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 343                         "MSR: \t0x%02x\n", ioread8(priv->membase + UART_MSR));
 344         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 345                         "BRCSR: \t0x%02x\n",
 346                         ioread8(priv->membase + PCH_UART_BRCSR));
 347
 348         lcr = ioread8(priv->membase + UART_LCR);
 349         iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
 350         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 351                         "DLL: \t0x%02x\n", ioread8(priv->membase + UART_DLL));
 352         len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
 353                         "DLM: \t0x%02x\n", ioread8(priv->membase + UART_DLM));
 354         iowrite8(lcr, priv->membase + UART_LCR);
 355
 356         if (len > PCH_REGS_BUFSIZE)
 357                 len = PCH_REGS_BUFSIZE;
 358
 359         ret =  simple_read_from_buffer(user_buf, count, ppos, buf, len);
 360         kfree(buf);
 361         return ret;
 362 }
 363
 364 static const struct file_operations port_regs_ops = {
 365         .owner          = THIS_MODULE,
 366         .open           = simple_open,
 367         .read           = port_show_regs,
 368         .llseek         = default_llseek,
 369 };
 370 #endif  /* CONFIG_DEBUG_FS */
 371
 372 /* Return UART clock, checking for board specific clocks. */
 373 static int pch_uart_get_uartclk(void)
 374 {
 375         const char *cmp;
 376
 377         if (user_uartclk)
 378                 return user_uartclk;
 379
 380         cmp = dmi_get_system_info(DMI_BOARD_NAME);
 381         if (cmp && strstr(cmp, "CM-iTC"))
 382                 return CMITC_UARTCLK;
 383
 384         cmp = dmi_get_system_info(DMI_BIOS_VERSION);
 385         if (cmp && strnstr(cmp, "FRI2", 4))
 386                 return FRI2_64_UARTCLK;
 387
 388         cmp = dmi_get_system_info(DMI_PRODUCT_NAME);
 389         if (cmp && strstr(cmp, "Fish River Island II"))
 390                 return FRI2_48_UARTCLK;
 391
 392         /* Kontron COMe-mTT10 (nanoETXexpress-TT) */
 393         cmp = dmi_get_system_info(DMI_BOARD_NAME);
 394         if (cmp && (strstr(cmp, "COMe-mTT") ||
 395                     strstr(cmp, "nanoETXexpress-TT")))
 396                 return NTC1_UARTCLK;
 397
 398         return DEFAULT_UARTCLK;
 399 }
 400
 401 static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv,
 402                                           unsigned int flag)
 403 {
 404         u8 ier = ioread8(priv->membase + UART_IER);
 405         ier |= flag & PCH_UART_IER_MASK;
 406         iowrite8(ier, priv->membase + UART_IER);
 407 }
 408
 409 static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
 410                                            unsigned int flag)
 411 {
 412         u8 ier = ioread8(priv->membase + UART_IER);
 413         ier &= ~(flag & PCH_UART_IER_MASK);
 414         iowrite8(ier, priv->membase + UART_IER);
 415 }
 416
 417 static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud,
 418                                  unsigned int parity, unsigned int bits,
 419                                  unsigned int stb)
 420 {
 421         unsigned int dll, dlm, lcr;
 422         int div;
 423
 424         div = DIV_ROUND_CLOSEST(priv->uartclk / 16, baud);
 425         if (div < 0 || USHRT_MAX <= div) {
 426                 dev_err(priv->port.dev, "Invalid Baud(div=0x%x)\n", div);
 427                 return -EINVAL;
 428         }
 429
 430         dll = (unsigned int)div & 0x00FFU;
 431         dlm = ((unsigned int)div >> 8) & 0x00FFU;
 432
 433         if (parity & ~(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS | PCH_UART_LCR_SP)) {
 434                 dev_err(priv->port.dev, "Invalid parity(0x%x)\n", parity);
 435                 return -EINVAL;
 436         }
 437
 438         if (bits & ~PCH_UART_LCR_WLS) {
 439                 dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits);
 440                 return -EINVAL;
 441         }
 442
 443         if (stb & ~PCH_UART_LCR_STB) {
 444                 dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb);
 445                 return -EINVAL;
 446         }
 447
 448         lcr = parity;
 449         lcr |= bits;
 450         lcr |= stb;
 451
 452         dev_dbg(priv->port.dev, "%s:baud = %d, div = %04x, lcr = %02x (%lu)\n",
 453                  __func__, baud, div, lcr, jiffies);
 454         iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
 455         iowrite8(dll, priv->membase + PCH_UART_DLL);
 456         iowrite8(dlm, priv->membase + PCH_UART_DLM);
 457         iowrite8(lcr, priv->membase + UART_LCR);
 458
 459         return 0;
 460 }
 461
 462 static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
 463                                     unsigned int flag)
 464 {
 465         if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) {
 466                 dev_err(priv->port.dev, "%s:Invalid flag(0x%x)\n",
 467                         __func__, flag);
 468                 return -EINVAL;
 469         }
 470
 471         iowrite8(PCH_UART_FCR_FIFOE | priv->fcr, priv->membase + UART_FCR);
 472         iowrite8(PCH_UART_FCR_FIFOE | priv->fcr | flag,
 473                  priv->membase + UART_FCR);
 474         iowrite8(priv->fcr, priv->membase + UART_FCR);
 475
 476         return 0;
 477 }
 478
 479 static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
 480                                  unsigned int dmamode,
 481                                  unsigned int fifo_size, unsigned int trigger)
 482 {
 483         u8 fcr;
 484
 485         if (dmamode & ~PCH_UART_FCR_DMS) {
 486                 dev_err(priv->port.dev, "%s:Invalid DMA Mode(0x%x)\n",
 487                         __func__, dmamode);
 488                 return -EINVAL;
 489         }
 490
 491         if (fifo_size & ~(PCH_UART_FCR_FIFOE | PCH_UART_FCR_FIFO256)) {
 492                 dev_err(priv->port.dev, "%s:Invalid FIFO SIZE(0x%x)\n",
 493                         __func__, fifo_size);
 494                 return -EINVAL;
 495         }
 496
 497         if (trigger & ~PCH_UART_FCR_RFTL) {
 498                 dev_err(priv->port.dev, "%s:Invalid TRIGGER(0x%x)\n",
 499                         __func__, trigger);
 500                 return -EINVAL;
 501         }
 502
 503         switch (priv->fifo_size) {
 504         case 256:
 505                 priv->trigger_level =
 506                     trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 507                 break;
 508         case 64:
 509                 priv->trigger_level =
 510                     trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 511                 break;
 512         case 16:
 513                 priv->trigger_level =
 514                     trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 515                 break;
 516         default:
 517                 priv->trigger_level =
 518                     trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 519                 break;
 520         }
 521         fcr =
 522             dmamode | fifo_size | trigger | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR;
 523         iowrite8(PCH_UART_FCR_FIFOE, priv->membase + UART_FCR);
 524         iowrite8(PCH_UART_FCR_FIFOE | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR,
 525                  priv->membase + UART_FCR);
 526         iowrite8(fcr, priv->membase + UART_FCR);
 527         priv->fcr = fcr;
 528
 529         return 0;
 530 }
 531
 532 static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
 533 {
 534         unsigned int msr = ioread8(priv->membase + UART_MSR);
 535         priv->dmsr = msr & PCH_UART_MSR_DELTA;
 536         return (u8)msr;
 537 }
 538
 539 static void pch_uart_hal_write(struct eg20t_port *priv,
 540                               const unsigned char *buf, int tx_size)
 541 {
 542         int i;
 543         unsigned int thr;
 544
 545         for (i = 0; i < tx_size;) {
 546                 thr = buf[i++];
 547                 iowrite8(thr, priv->membase + PCH_UART_THR);
 548         }
 549 }
 550
 551 static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
 552                              int rx_size)
 553 {
 554         int i;
 555         u8 rbr, lsr;
 556
 557         lsr = ioread8(priv->membase + UART_LSR);
 558         for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
 559              i < rx_size && lsr & UART_LSR_DR;
 560              lsr = ioread8(priv->membase + UART_LSR)) {
 561                 rbr = ioread8(priv->membase + PCH_UART_RBR);
 562                 buf[i++] = rbr;
 563         }
 564         return i;
 565 }
 566
 567 static unsigned char pch_uart_hal_get_iid(struct eg20t_port *priv)
 568 {
 569         return ioread8(priv->membase + UART_IIR) &\
 570                       (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP);
 571 }
 572
 573 static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
 574 {
 575         return ioread8(priv->membase + UART_LSR);
 576 }
 577
 578 static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
 579 {
 580         unsigned int lcr;
 581
 582         lcr = ioread8(priv->membase + UART_LCR);
 583         if (on)
 584                 lcr |= PCH_UART_LCR_SB;
 585         else
 586                 lcr &= ~PCH_UART_LCR_SB;
 587
 588         iowrite8(lcr, priv->membase + UART_LCR);
 589 }
 590
 591 static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
 592                    int size)
 593 {
 594         struct uart_port *port;
 595         struct tty_struct *tty;
 596
 597         port = &priv->port;
 598         tty = tty_port_tty_get(&port->state->port);
 599         if (!tty) {
 600                 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
 601                 return -EBUSY;
 602         }
 603
 604         tty_insert_flip_string(tty, buf, size);
 605         tty_flip_buffer_push(tty);
 606         tty_kref_put(tty);
 607
 608         return 0;
 609 }
 610
 611 static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf)
 612 {
 613         int ret = 0;
 614         struct uart_port *port = &priv->port;
 615
 616         if (port->x_char) {
 617                 dev_dbg(priv->port.dev, "%s:X character send %02x (%lu)\n",
 618                         __func__, port->x_char, jiffies);
 619                 buf[0] = port->x_char;
 620                 port->x_char = 0;
 621                 ret = 1;
 622         }
 623
 624         return ret;
 625 }
 626
 627 static int dma_push_rx(struct eg20t_port *priv, int size)
 628 {
 629         struct tty_struct *tty;
 630         int room;
 631         struct uart_port *port = &priv->port;
 632
 633         port = &priv->port;
 634         tty = tty_port_tty_get(&port->state->port);
 635         if (!tty) {
 636                 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
 637                 return 0;
 638         }
 639
 640         room = tty_buffer_request_room(tty, size);
 641
 642         if (room < size)
 643                 dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
 644                          size - room);
 645         if (!room)
 646                 return room;
 647
 648         tty_insert_flip_string(tty, sg_virt(&priv->sg_rx), size);
 649
 650         port->icount.rx += room;
 651         tty_kref_put(tty);
 652
 653         return room;
 654 }
 655
 656 static void pch_free_dma(struct uart_port *port)
 657 {
 658         struct eg20t_port *priv;
 659         priv = container_of(port, struct eg20t_port, port);
 660
 661         if (priv->chan_tx) {
 662                 dma_release_channel(priv->chan_tx);
 663                 priv->chan_tx = NULL;
 664         }
 665         if (priv->chan_rx) {
 666                 dma_release_channel(priv->chan_rx);
 667                 priv->chan_rx = NULL;
 668         }
 669
 670         if (priv->rx_buf_dma) {
 671                 dma_free_coherent(port->dev, port->fifosize, priv->rx_buf_virt,
 672                                   priv->rx_buf_dma);
 673                 priv->rx_buf_virt = NULL;
 674                 priv->rx_buf_dma = 0;
 675         }
 676
 677         return;
 678 }
 679
 680 static bool filter(struct dma_chan *chan, void *slave)
 681 {
 682         struct pch_dma_slave *param = slave;
 683
 684         if ((chan->chan_id == param->chan_id) && (param->dma_dev ==
 685                                                   chan->device->dev)) {
 686                 chan->private = param;
 687                 return true;
 688         } else {
 689                 return false;
 690         }
 691 }
 692
 693 static void pch_request_dma(struct uart_port *port)
 694 {
 695         dma_cap_mask_t mask;
 696         struct dma_chan *chan;
 697         struct pci_dev *dma_dev;
 698         struct pch_dma_slave *param;
 699         struct eg20t_port *priv =
 700                                 container_of(port, struct eg20t_port, port);
 701         dma_cap_zero(mask);
 702         dma_cap_set(DMA_SLAVE, mask);
 703
 704         dma_dev = pci_get_bus_and_slot(priv->pdev->bus->number,
 705                                        PCI_DEVFN(0xa, 0)); /* Get DMA's dev
 706                                                                 information */
 707         /* Set Tx DMA */
 708         param = &priv->param_tx;
 709         param->dma_dev = &dma_dev->dev;
 710         param->chan_id = priv->port.line * 2; /* Tx = 0, 2, 4, ... */
 711
 712         param->tx_reg = port->mapbase + UART_TX;
 713         chan = dma_request_channel(mask, filter, param);
 714         if (!chan) {
 715                 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
 716                         __func__);
 717                 return;
 718         }
 719         priv->chan_tx = chan;
 720
 721         /* Set Rx DMA */
 722         param = &priv->param_rx;
 723         param->dma_dev = &dma_dev->dev;
 724         param->chan_id = priv->port.line * 2 + 1; /* Rx = Tx + 1 */
 725
 726         param->rx_reg = port->mapbase + UART_RX;
 727         chan = dma_request_channel(mask, filter, param);
 728         if (!chan) {
 729                 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Rx)\n",
 730                         __func__);
 731                 dma_release_channel(priv->chan_tx);
 732                 priv->chan_tx = NULL;
 733                 return;
 734         }
 735
 736         /* Get Consistent memory for DMA */
 737         priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
 738                                     &priv->rx_buf_dma, GFP_KERNEL);
 739         priv->chan_rx = chan;
 740 }
 741
 742 static void pch_dma_rx_complete(void *arg)
 743 {
 744         struct eg20t_port *priv = arg;
 745         struct uart_port *port = &priv->port;
 746         struct tty_struct *tty = tty_port_tty_get(&port->state->port);
 747         int count;
 748
 749         if (!tty) {
 750                 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
 751                 return;
 752         }
 753
 754         dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
 755         count = dma_push_rx(priv, priv->trigger_level);
 756         if (count)
 757                 tty_flip_buffer_push(tty);
 758         tty_kref_put(tty);
 759         async_tx_ack(priv->desc_rx);
 760         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
 761                                             PCH_UART_HAL_RX_ERR_INT);
 762 }
 763
 764 static void pch_dma_tx_complete(void *arg)
 765 {
 766         struct eg20t_port *priv = arg;
 767         struct uart_port *port = &priv->port;
 768         struct circ_buf *xmit = &port->state->xmit;
 769         struct scatterlist *sg = priv->sg_tx_p;
 770         int i;
 771
 772         for (i = 0; i < priv->nent; i++, sg++) {
 773                 xmit->tail += sg_dma_len(sg);
 774                 port->icount.tx += sg_dma_len(sg);
 775         }
 776         xmit->tail &= UART_XMIT_SIZE - 1;
 777         async_tx_ack(priv->desc_tx);
 778         dma_unmap_sg(port->dev, sg, priv->nent, DMA_TO_DEVICE);
 779         priv->tx_dma_use = 0;
 780         priv->nent = 0;
 781         kfree(priv->sg_tx_p);
 782         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
 783 }
 784
 785 static int pop_tx(struct eg20t_port *priv, int size)
 786 {
 787         int count = 0;
 788         struct uart_port *port = &priv->port;
 789         struct circ_buf *xmit = &port->state->xmit;
 790
 791         if (uart_tx_stopped(port) || uart_circ_empty(xmit) || count >= size)
 792                 goto pop_tx_end;
 793
 794         do {
 795                 int cnt_to_end =
 796                     CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
 797                 int sz = min(size - count, cnt_to_end);
 798                 pch_uart_hal_write(priv, &xmit->buf[xmit->tail], sz);
 799                 xmit->tail = (xmit->tail + sz) & (UART_XMIT_SIZE - 1);
 800                 count += sz;
 801         } while (!uart_circ_empty(xmit) && count < size);
 802
 803 pop_tx_end:
 804         dev_dbg(priv->port.dev, "%d characters. Remained %d characters.(%lu)\n",
 805                  count, size - count, jiffies);
 806
 807         return count;
 808 }
 809
 810 static int handle_rx_to(struct eg20t_port *priv)
 811 {
 812         struct pch_uart_buffer *buf;
 813         int rx_size;
 814         int ret;
 815         if (!priv->start_rx) {
 816                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
 817                                                      PCH_UART_HAL_RX_ERR_INT);
 818                 return 0;
 819         }
 820         buf = &priv->rxbuf;
 821         do {
 822                 rx_size = pch_uart_hal_read(priv, buf->buf, buf->size);
 823                 ret = push_rx(priv, buf->buf, rx_size);
 824                 if (ret)
 825                         return 0;
 826         } while (rx_size == buf->size);
 827
 828         return PCH_UART_HANDLED_RX_INT;
 829 }
 830
 831 static int handle_rx(struct eg20t_port *priv)
 832 {
 833         return handle_rx_to(priv);
 834 }
 835
 836 static int dma_handle_rx(struct eg20t_port *priv)
 837 {
 838         struct uart_port *port = &priv->port;
 839         struct dma_async_tx_descriptor *desc;
 840         struct scatterlist *sg;
 841
 842         priv = container_of(port, struct eg20t_port, port);
 843         sg = &priv->sg_rx;
 844
 845         sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */
 846
 847         sg_dma_len(sg) = priv->trigger_level;
 848
 849         sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt),
 850                      sg_dma_len(sg), (unsigned long)priv->rx_buf_virt &
 851                      ~PAGE_MASK);
 852
 853         sg_dma_address(sg) = priv->rx_buf_dma;
 854
 855         desc = dmaengine_prep_slave_sg(priv->chan_rx,
 856                         sg, 1, DMA_DEV_TO_MEM,
 857                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 858
 859         if (!desc)
 860                 return 0;
 861
 862         priv->desc_rx = desc;
 863         desc->callback = pch_dma_rx_complete;
 864         desc->callback_param = priv;
 865         desc->tx_submit(desc);
 866         dma_async_issue_pending(priv->chan_rx);
 867
 868         return PCH_UART_HANDLED_RX_INT;
 869 }
 870
 871 static unsigned int handle_tx(struct eg20t_port *priv)
 872 {
 873         struct uart_port *port = &priv->port;
 874         struct circ_buf *xmit = &port->state->xmit;
 875         int fifo_size;
 876         int tx_size;
 877         int size;
 878         int tx_empty;
 879
 880         if (!priv->start_tx) {
 881                 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
 882                         __func__, jiffies);
 883                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 884                 priv->tx_empty = 1;
 885                 return 0;
 886         }
 887
 888         fifo_size = max(priv->fifo_size, 1);
 889         tx_empty = 1;
 890         if (pop_tx_x(priv, xmit->buf)) {
 891                 pch_uart_hal_write(priv, xmit->buf, 1);
 892                 port->icount.tx++;
 893                 tx_empty = 0;
 894                 fifo_size--;
 895         }
 896         size = min(xmit->head - xmit->tail, fifo_size);
 897         if (size < 0)
 898                 size = fifo_size;
 899
 900         tx_size = pop_tx(priv, size);
 901         if (tx_size > 0) {
 902                 port->icount.tx += tx_size;
 903                 tx_empty = 0;
 904         }
 905
 906         priv->tx_empty = tx_empty;
 907
 908         if (tx_empty) {
 909                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 910                 uart_write_wakeup(port);
 911         }
 912
 913         return PCH_UART_HANDLED_TX_INT;
 914 }
 915
 916 static unsigned int dma_handle_tx(struct eg20t_port *priv)
 917 {
 918         struct uart_port *port = &priv->port;
 919         struct circ_buf *xmit = &port->state->xmit;
 920         struct scatterlist *sg;
 921         int nent;
 922         int fifo_size;
 923         int tx_empty;
 924         struct dma_async_tx_descriptor *desc;
 925         int num;
 926         int i;
 927         int bytes;
 928         int size;
 929         int rem;
 930
 931         if (!priv->start_tx) {
 932                 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
 933                         __func__, jiffies);
 934                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 935                 priv->tx_empty = 1;
 936                 return 0;
 937         }
 938
 939         if (priv->tx_dma_use) {
 940                 dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n",
 941                         __func__, jiffies);
 942                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 943                 priv->tx_empty = 1;
 944                 return 0;
 945         }
 946
 947         fifo_size = max(priv->fifo_size, 1);
 948         tx_empty = 1;
 949         if (pop_tx_x(priv, xmit->buf)) {
 950                 pch_uart_hal_write(priv, xmit->buf, 1);
 951                 port->icount.tx++;
 952                 tx_empty = 0;
 953                 fifo_size--;
 954         }
 955
 956         bytes = min((int)CIRC_CNT(xmit->head, xmit->tail,
 957                              UART_XMIT_SIZE), CIRC_CNT_TO_END(xmit->head,
 958                              xmit->tail, UART_XMIT_SIZE));
 959         if (!bytes) {
 960                 dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__);
 961                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 962                 uart_write_wakeup(port);
 963                 return 0;
 964         }
 965
 966         if (bytes > fifo_size) {
 967                 num = bytes / fifo_size + 1;
 968                 size = fifo_size;
 969                 rem = bytes % fifo_size;
 970         } else {
 971                 num = 1;
 972                 size = bytes;
 973                 rem = bytes;
 974         }
 975
 976         dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n",
 977                 __func__, num, size, rem);
 978
 979         priv->tx_dma_use = 1;
 980
 981         priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
 982         if (!priv->sg_tx_p) {
 983                 dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__);
 984                 return 0;
 985         }
 986
 987         sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
 988         sg = priv->sg_tx_p;
 989
 990         for (i = 0; i < num; i++, sg++) {
 991                 if (i == (num - 1))
 992                         sg_set_page(sg, virt_to_page(xmit->buf),
 993                                     rem, fifo_size * i);
 994                 else
 995                         sg_set_page(sg, virt_to_page(xmit->buf),
 996                                     size, fifo_size * i);
 997         }
 998
 999         sg = priv->sg_tx_p;
1000         nent = dma_map_sg(port->dev, sg, num, DMA_TO_DEVICE);
1001         if (!nent) {
1002                 dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__);
1003                 return 0;
1004         }
1005         priv->nent = nent;
1006
1007         for (i = 0; i < nent; i++, sg++) {
1008                 sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) +
1009                               fifo_size * i;
1010                 sg_dma_address(sg) = (sg_dma_address(sg) &
1011                                     ~(UART_XMIT_SIZE - 1)) + sg->offset;
1012                 if (i == (nent - 1))
1013                         sg_dma_len(sg) = rem;
1014                 else
1015                         sg_dma_len(sg) = size;
1016         }
1017
1018         desc = dmaengine_prep_slave_sg(priv->chan_tx,
1019                                         priv->sg_tx_p, nent, DMA_MEM_TO_DEV,
1020                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1021         if (!desc) {
1022                 dev_err(priv->port.dev, "%s:device_prep_slave_sg Failed\n",
1023                         __func__);
1024                 return 0;
1025         }
1026         dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE);
1027         priv->desc_tx = desc;
1028         desc->callback = pch_dma_tx_complete;
1029         desc->callback_param = priv;
1030
1031         desc->tx_submit(desc);
1032
1033         dma_async_issue_pending(priv->chan_tx);
1034
1035         return PCH_UART_HANDLED_TX_INT;
1036 }
1037
1038 static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
1039 {
1040         u8 fcr = ioread8(priv->membase + UART_FCR);
1041
1042         /* Reset FIFO */
1043         fcr |= UART_FCR_CLEAR_RCVR;
1044         iowrite8(fcr, priv->membase + UART_FCR);
1045
1046         if (lsr & PCH_UART_LSR_ERR)
1047                 dev_err(&priv->pdev->dev, "Error data in FIFO\n");
1048
1049         if (lsr & UART_LSR_FE)
1050                 dev_err(&priv->pdev->dev, "Framing Error\n");
1051
1052         if (lsr & UART_LSR_PE)
1053                 dev_err(&priv->pdev->dev, "Parity Error\n");
1054
1055         if (lsr & UART_LSR_OE)
1056                 dev_err(&priv->pdev->dev, "Overrun Error\n");
1057 }
1058
1059 static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
1060 {
1061         struct eg20t_port *priv = dev_id;
1062         unsigned int handled;
1063         u8 lsr;
1064         int ret = 0;
1065         unsigned char iid;
1066         unsigned long flags;
1067         int next = 1;
1068         u8 msr;
1069
1070         spin_lock_irqsave(&priv->lock, flags);
1071         handled = 0;
1072         while (next) {
1073                 iid = pch_uart_hal_get_iid(priv);
1074                 if (iid & PCH_UART_IIR_IP) /* No Interrupt */
1075                         break;
1076                 switch (iid) {
1077                 case PCH_UART_IID_RLS:  /* Receiver Line Status */
1078                         lsr = pch_uart_hal_get_line_status(priv);
1079                         if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
1080                                                 UART_LSR_PE | UART_LSR_OE)) {
1081                                 pch_uart_err_ir(priv, lsr);
1082                                 ret = PCH_UART_HANDLED_RX_ERR_INT;
1083                         } else {
1084                                 ret = PCH_UART_HANDLED_LS_INT;
1085                         }
1086                         break;
1087                 case PCH_UART_IID_RDR:  /* Received Data Ready */
1088                         if (priv->use_dma) {
1089                                 pch_uart_hal_disable_interrupt(priv,
1090                                                 PCH_UART_HAL_RX_INT |
1091                                                 PCH_UART_HAL_RX_ERR_INT);
1092                                 ret = dma_handle_rx(priv);
1093                                 if (!ret)
1094                                         pch_uart_hal_enable_interrupt(priv,
1095                                                 PCH_UART_HAL_RX_INT |
1096                                                 PCH_UART_HAL_RX_ERR_INT);
1097                         } else {
1098                                 ret = handle_rx(priv);
1099                         }
1100                         break;
1101                 case PCH_UART_IID_RDR_TO:       /* Received Data Ready
1102                                                    (FIFO Timeout) */
1103                         ret = handle_rx_to(priv);
1104                         break;
1105                 case PCH_UART_IID_THRE: /* Transmitter Holding Register
1106                                                    Empty */
1107                         if (priv->use_dma)
1108                                 ret = dma_handle_tx(priv);
1109                         else
1110                                 ret = handle_tx(priv);
1111                         break;
1112                 case PCH_UART_IID_MS:   /* Modem Status */
1113                         msr = pch_uart_hal_get_modem(priv);
1114                         next = 0; /* MS ir prioirty is the lowest. So, MS ir
1115                                      means final interrupt */
1116                         if ((msr & UART_MSR_ANY_DELTA) == 0)
1117                                 break;
1118                         ret |= PCH_UART_HANDLED_MS_INT;
1119                         break;
1120                 default:        /* Never junp to this label */
1121                         dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__,
1122                                 iid, jiffies);
1123                         ret = -1;
1124                         next = 0;
1125                         break;
1126                 }
1127                 handled |= (unsigned int)ret;
1128         }
1129
1130         spin_unlock_irqrestore(&priv->lock, flags);
1131         return IRQ_RETVAL(handled);
1132 }
1133
1134 /* This function tests whether the transmitter fifo and shifter for the port
1135                                                 described by 'port' is empty. */
1136 static unsigned int pch_uart_tx_empty(struct uart_port *port)
1137 {
1138         struct eg20t_port *priv;
1139
1140         priv = container_of(port, struct eg20t_port, port);
1141         if (priv->tx_empty)
1142                 return TIOCSER_TEMT;
1143         else
1144                 return 0;
1145 }
1146
1147 /* Returns the current state of modem control inputs. */
1148 static unsigned int pch_uart_get_mctrl(struct uart_port *port)
1149 {
1150         struct eg20t_port *priv;
1151         u8 modem;
1152         unsigned int ret = 0;
1153
1154         priv = container_of(port, struct eg20t_port, port);
1155         modem = pch_uart_hal_get_modem(priv);
1156
1157         if (modem & UART_MSR_DCD)
1158                 ret |= TIOCM_CAR;
1159
1160         if (modem & UART_MSR_RI)
1161                 ret |= TIOCM_RNG;
1162
1163         if (modem & UART_MSR_DSR)
1164                 ret |= TIOCM_DSR;
1165
1166         if (modem & UART_MSR_CTS)
1167                 ret |= TIOCM_CTS;
1168
1169         return ret;
1170 }
1171
1172 static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1173 {
1174         u32 mcr = 0;
1175         struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
1176
1177         if (mctrl & TIOCM_DTR)
1178                 mcr |= UART_MCR_DTR;
1179         if (mctrl & TIOCM_RTS)
1180                 mcr |= UART_MCR_RTS;
1181         if (mctrl & TIOCM_LOOP)
1182                 mcr |= UART_MCR_LOOP;
1183
1184         if (priv->mcr & UART_MCR_AFE)
1185                 mcr |= UART_MCR_AFE;
1186
1187         if (mctrl)
1188                 iowrite8(mcr, priv->membase + UART_MCR);
1189 }
1190
1191 static void pch_uart_stop_tx(struct uart_port *port)
1192 {
1193         struct eg20t_port *priv;
1194         priv = container_of(port, struct eg20t_port, port);
1195         priv->start_tx = 0;
1196         priv->tx_dma_use = 0;
1197 }
1198
1199 static void pch_uart_start_tx(struct uart_port *port)
1200 {
1201         struct eg20t_port *priv;
1202
1203         priv = container_of(port, struct eg20t_port, port);
1204
1205         if (priv->use_dma) {
1206                 if (priv->tx_dma_use) {
1207                         dev_dbg(priv->port.dev, "%s : Tx DMA is NOT empty.\n",
1208                                 __func__);
1209                         return;
1210                 }
1211         }
1212
1213         priv->start_tx = 1;
1214         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
1215 }
1216
1217 static void pch_uart_stop_rx(struct uart_port *port)
1218 {
1219         struct eg20t_port *priv;
1220         priv = container_of(port, struct eg20t_port, port);
1221         priv->start_rx = 0;
1222         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
1223                                              PCH_UART_HAL_RX_ERR_INT);
1224 }
1225
1226 /* Enable the modem status interrupts. */
1227 static void pch_uart_enable_ms(struct uart_port *port)
1228 {
1229         struct eg20t_port *priv;
1230         priv = container_of(port, struct eg20t_port, port);
1231         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
1232 }
1233
1234 /* Control the transmission of a break signal. */
1235 static void pch_uart_break_ctl(struct uart_port *port, int ctl)
1236 {
1237         struct eg20t_port *priv;
1238         unsigned long flags;
1239
1240         priv = container_of(port, struct eg20t_port, port);
1241         spin_lock_irqsave(&priv->lock, flags);
1242         pch_uart_hal_set_break(priv, ctl);
1243         spin_unlock_irqrestore(&priv->lock, flags);
1244 }
1245
1246 /* Grab any interrupt resources and initialise any low level driver state. */
1247 static int pch_uart_startup(struct uart_port *port)
1248 {
1249         struct eg20t_port *priv;
1250         int ret;
1251         int fifo_size;
1252         int trigger_level;
1253
1254         priv = container_of(port, struct eg20t_port, port);
1255         priv->tx_empty = 1;
1256
1257         if (port->uartclk)
1258                 priv->uartclk = port->uartclk;
1259         else
1260                 port->uartclk = priv->uartclk;
1261
1262         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1263         ret = pch_uart_hal_set_line(priv, default_baud,
1264                               PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
1265                               PCH_UART_HAL_STB1);
1266         if (ret)
1267                 return ret;
1268
1269         switch (priv->fifo_size) {
1270         case 256:
1271                 fifo_size = PCH_UART_HAL_FIFO256;
1272                 break;
1273         case 64:
1274                 fifo_size = PCH_UART_HAL_FIFO64;
1275                 break;
1276         case 16:
1277                 fifo_size = PCH_UART_HAL_FIFO16;
1278                 break;
1279         case 1:
1280         default:
1281                 fifo_size = PCH_UART_HAL_FIFO_DIS;
1282                 break;
1283         }
1284
1285         switch (priv->trigger) {
1286         case PCH_UART_HAL_TRIGGER1:
1287                 trigger_level = 1;
1288                 break;
1289         case PCH_UART_HAL_TRIGGER_L:
1290                 trigger_level = priv->fifo_size / 4;
1291                 break;
1292         case PCH_UART_HAL_TRIGGER_M:
1293                 trigger_level = priv->fifo_size / 2;
1294                 break;
1295         case PCH_UART_HAL_TRIGGER_H:
1296         default:
1297                 trigger_level = priv->fifo_size - (priv->fifo_size / 8);
1298                 break;
1299         }
1300
1301         priv->trigger_level = trigger_level;
1302         ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1303                                     fifo_size, priv->trigger);
1304         if (ret < 0)
1305                 return ret;
1306
1307         ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
1308                         KBUILD_MODNAME, priv);
1309         if (ret < 0)
1310                 return ret;
1311
1312         if (priv->use_dma)
1313                 pch_request_dma(port);
1314
1315         priv->start_rx = 1;
1316         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
1317                                             PCH_UART_HAL_RX_ERR_INT);
1318         uart_update_timeout(port, CS8, default_baud);
1319
1320         return 0;
1321 }
1322
1323 static void pch_uart_shutdown(struct uart_port *port)
1324 {
1325         struct eg20t_port *priv;
1326         int ret;
1327
1328         priv = container_of(port, struct eg20t_port, port);
1329         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1330         pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
1331         ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1332                               PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
1333         if (ret)
1334                 dev_err(priv->port.dev,
1335                         "pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);
1336
1337         pch_free_dma(port);
1338
1339         free_irq(priv->port.irq, priv);
1340 }
1341
1342 /* Change the port parameters, including word length, parity, stop
1343  *bits.  Update read_status_mask and ignore_status_mask to indicate
1344  *the types of events we are interested in receiving.  */
1345 static void pch_uart_set_termios(struct uart_port *port,
1346                                  struct ktermios *termios, struct ktermios *old)
1347 {
1348         int baud;
1349         int rtn;
1350         unsigned int parity, bits, stb;
1351         struct eg20t_port *priv;
1352         unsigned long flags;
1353
1354         priv = container_of(port, struct eg20t_port, port);
1355         switch (termios->c_cflag & CSIZE) {
1356         case CS5:
1357                 bits = PCH_UART_HAL_5BIT;
1358                 break;
1359         case CS6:
1360                 bits = PCH_UART_HAL_6BIT;
1361                 break;
1362         case CS7:
1363                 bits = PCH_UART_HAL_7BIT;
1364                 break;
1365         default:                /* CS8 */
1366                 bits = PCH_UART_HAL_8BIT;
1367                 break;
1368         }
1369         if (termios->c_cflag & CSTOPB)
1370                 stb = PCH_UART_HAL_STB2;
1371         else
1372                 stb = PCH_UART_HAL_STB1;
1373
1374         if (termios->c_cflag & PARENB) {
1375                 if (termios->c_cflag & PARODD)
1376                         parity = PCH_UART_HAL_PARITY_ODD;
1377                 else
1378                         parity = PCH_UART_HAL_PARITY_EVEN;
1379
1380         } else
1381                 parity = PCH_UART_HAL_PARITY_NONE;
1382
1383         /* Only UART0 has auto hardware flow function */
1384         if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256))
1385                 priv->mcr |= UART_MCR_AFE;
1386         else
1387                 priv->mcr &= ~UART_MCR_AFE;
1388
1389         termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
1390
1391         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
1392
1393         spin_lock_irqsave(&priv->lock, flags);
1394         spin_lock(&port->lock);
1395
1396         uart_update_timeout(port, termios->c_cflag, baud);
1397         rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
1398         if (rtn)
1399                 goto out;
1400
1401         pch_uart_set_mctrl(&priv->port, priv->port.mctrl);
1402         /* Don't rewrite B0 */
1403         if (tty_termios_baud_rate(termios))
1404                 tty_termios_encode_baud_rate(termios, baud, baud);
1405
1406 out:
1407         spin_unlock(&port->lock);
1408         spin_unlock_irqrestore(&priv->lock, flags);
1409 }
1410
1411 static const char *pch_uart_type(struct uart_port *port)
1412 {
1413         return KBUILD_MODNAME;
1414 }
1415
1416 static void pch_uart_release_port(struct uart_port *port)
1417 {
1418         struct eg20t_port *priv;
1419
1420         priv = container_of(port, struct eg20t_port, port);
1421         pci_iounmap(priv->pdev, priv->membase);
1422         pci_release_regions(priv->pdev);
1423 }
1424
1425 static int pch_uart_request_port(struct uart_port *port)
1426 {
1427         struct eg20t_port *priv;
1428         int ret;
1429         void __iomem *membase;
1430
1431         priv = container_of(port, struct eg20t_port, port);
1432         ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
1433         if (ret < 0)
1434                 return -EBUSY;
1435
1436         membase = pci_iomap(priv->pdev, 1, 0);
1437         if (!membase) {
1438                 pci_release_regions(priv->pdev);
1439                 return -EBUSY;
1440         }
1441         priv->membase = port->membase = membase;
1442
1443         return 0;
1444 }
1445
1446 static void pch_uart_config_port(struct uart_port *port, int type)
1447 {
1448         struct eg20t_port *priv;
1449
1450         priv = container_of(port, struct eg20t_port, port);
1451         if (type & UART_CONFIG_TYPE) {
1452                 port->type = priv->port_type;
1453                 pch_uart_request_port(port);
1454         }
1455 }
1456
1457 static int pch_uart_verify_port(struct uart_port *port,
1458                                 struct serial_struct *serinfo)
1459 {
1460         struct eg20t_port *priv;
1461
1462         priv = container_of(port, struct eg20t_port, port);
1463         if (serinfo->flags & UPF_LOW_LATENCY) {
1464                 dev_info(priv->port.dev,
1465                         "PCH UART : Use PIO Mode (without DMA)\n");
1466                 priv->use_dma = 0;
1467                 serinfo->flags &= ~UPF_LOW_LATENCY;
1468         } else {
1469 #ifndef CONFIG_PCH_DMA
1470                 dev_err(priv->port.dev, "%s : PCH DMA is not Loaded.\n",
1471                         __func__);
1472                 return -EOPNOTSUPP;
1473 #endif
1474                 dev_info(priv->port.dev, "PCH UART : Use DMA Mode\n");
1475                 if (!priv->use_dma)
1476                         pch_request_dma(port);
1477                 priv->use_dma = 1;
1478         }
1479
1480         return 0;
1481 }
1482
1483 static struct uart_ops pch_uart_ops = {
1484         .tx_empty = pch_uart_tx_empty,
1485         .set_mctrl = pch_uart_set_mctrl,
1486         .get_mctrl = pch_uart_get_mctrl,
1487         .stop_tx = pch_uart_stop_tx,
1488         .start_tx = pch_uart_start_tx,
1489         .stop_rx = pch_uart_stop_rx,
1490         .enable_ms = pch_uart_enable_ms,
1491         .break_ctl = pch_uart_break_ctl,
1492         .startup = pch_uart_startup,
1493         .shutdown = pch_uart_shutdown,
1494         .set_termios = pch_uart_set_termios,
1495 /*      .pm             = pch_uart_pm,          Not supported yet */
1496 /*      .set_wake       = pch_uart_set_wake,    Not supported yet */
1497         .type = pch_uart_type,
1498         .release_port = pch_uart_release_port,
1499         .request_port = pch_uart_request_port,
1500         .config_port = pch_uart_config_port,
1501         .verify_port = pch_uart_verify_port
1502 };
1503
1504 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1505
1506 /*
1507  *      Wait for transmitter & holding register to empty
1508  */
1509 static void wait_for_xmitr(struct eg20t_port *up, int bits)
1510 {
1511         unsigned int status, tmout = 10000;
1512
1513         /* Wait up to 10ms for the character(s) to be sent. */
1514         for (;;) {
1515                 status = ioread8(up->membase + UART_LSR);
1516
1517                 if ((status & bits) == bits)
1518                         break;
1519                 if (--tmout == 0)
1520                         break;
1521                 udelay(1);
1522         }
1523
1524         /* Wait up to 1s for flow control if necessary */
1525         if (up->port.flags & UPF_CONS_FLOW) {
1526                 unsigned int tmout;
1527                 for (tmout = 1000000; tmout; tmout--) {
1528                         unsigned int msr = ioread8(up->membase + UART_MSR);
1529                         if (msr & UART_MSR_CTS)
1530                                 break;
1531                         udelay(1);
1532                         touch_nmi_watchdog();
1533                 }
1534         }
1535 }
1536
1537 static void pch_console_putchar(struct uart_port *port, int ch)
1538 {
1539         struct eg20t_port *priv =
1540                 container_of(port, struct eg20t_port, port);
1541
1542         wait_for_xmitr(priv, UART_LSR_THRE);
1543         iowrite8(ch, priv->membase + PCH_UART_THR);
1544 }
1545
1546 /*
1547  *      Print a string to the serial port trying not to disturb
1548  *      any possible real use of the port...
1549  *
1550  *      The console_lock must be held when we get here.
1551  */
1552 static void
1553 pch_console_write(struct console *co, const char *s, unsigned int count)
1554 {
1555         struct eg20t_port *priv;
1556         unsigned long flags;
1557         int priv_locked = 1;
1558         int port_locked = 1;
1559         u8 ier;
1560
1561         priv = pch_uart_ports[co->index];
1562
1563         touch_nmi_watchdog();
1564
1565         local_irq_save(flags);
1566         if (priv->port.sysrq) {
1567                 spin_lock(&priv->lock);
1568                 /* serial8250_handle_port() already took the port lock */
1569                 port_locked = 0;
1570         } else if (oops_in_progress) {
1571                 priv_locked = spin_trylock(&priv->lock);
1572                 port_locked = spin_trylock(&priv->port.lock);
1573         } else {
1574                 spin_lock(&priv->lock);
1575                 spin_lock(&priv->port.lock);
1576         }
1577
1578         /*
1579          *      First save the IER then disable the interrupts
1580          */
1581         ier = ioread8(priv->membase + UART_IER);
1582
1583         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1584
1585         uart_console_write(&priv->port, s, count, pch_console_putchar);
1586
1587         /*
1588          *      Finally, wait for transmitter to become empty
1589          *      and restore the IER
1590          */
1591         wait_for_xmitr(priv, BOTH_EMPTY);
1592         iowrite8(ier, priv->membase + UART_IER);
1593
1594         if (port_locked)
1595                 spin_unlock(&priv->port.lock);
1596         if (priv_locked)
1597                 spin_unlock(&priv->lock);
1598         local_irq_restore(flags);
1599 }
1600
1601 static int __init pch_console_setup(struct console *co, char *options)
1602 {
1603         struct uart_port *port;
1604         int baud = default_baud;
1605         int bits = 8;
1606         int parity = 'n';
1607         int flow = 'n';
1608
1609         /*
1610          * Check whether an invalid uart number has been specified, and
1611          * if so, search for the first available port that does have
1612          * console support.
1613          */
1614         if (co->index >= PCH_UART_NR)
1615                 co->index = 0;
1616         port = &pch_uart_ports[co->index]->port;
1617
1618         if (!port || (!port->iobase && !port->membase))
1619                 return -ENODEV;
1620
1621         port->uartclk = pch_uart_get_uartclk();
1622
1623         if (options)
1624                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1625
1626         return uart_set_options(port, co, baud, parity, bits, flow);
1627 }
1628
1629 static struct uart_driver pch_uart_driver;
1630
1631 static struct console pch_console = {
1632         .name           = PCH_UART_DRIVER_DEVICE,
1633         .write          = pch_console_write,
1634         .device         = uart_console_device,
1635         .setup          = pch_console_setup,
1636         .flags          = CON_PRINTBUFFER | CON_ANYTIME,
1637         .index          = -1,
1638         .data           = &pch_uart_driver,
1639 };
1640
1641 #define PCH_CONSOLE     (&pch_console)
1642 #else
1643 #define PCH_CONSOLE     NULL
1644 #endif
1645
1646 static struct uart_driver pch_uart_driver = {
1647         .owner = THIS_MODULE,
1648         .driver_name = KBUILD_MODNAME,
1649         .dev_name = PCH_UART_DRIVER_DEVICE,
1650         .major = 0,
1651         .minor = 0,
1652         .nr = PCH_UART_NR,
1653         .cons = PCH_CONSOLE,
1654 };
1655
1656 static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
1657                                              const struct pci_device_id *id)
1658 {
1659         struct eg20t_port *priv;
1660         int ret;
1661         unsigned int iobase;
1662         unsigned int mapbase;
1663         unsigned char *rxbuf;
1664         int fifosize;
1665         int port_type;
1666         struct pch_uart_driver_data *board;
1667         char name[32];  /* for debugfs file name */
1668
1669         board = &drv_dat[id->driver_data];
1670         port_type = board->port_type;
1671
1672         priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
1673         if (priv == NULL)
1674                 goto init_port_alloc_err;
1675
1676         rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1677         if (!rxbuf)
1678                 goto init_port_free_txbuf;
1679
1680         switch (port_type) {
1681         case PORT_UNKNOWN:
1682                 fifosize = 256; /* EG20T/ML7213: UART0 */
1683                 break;
1684         case PORT_8250:
1685                 fifosize = 64; /* EG20T:UART1~3  ML7213: UART1~2*/
1686                 break;
1687         default:
1688                 dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
1689                 goto init_port_hal_free;
1690         }
1691
1692         pci_enable_msi(pdev);
1693         pci_set_master(pdev);
1694
1695         spin_lock_init(&priv->lock);
1696
1697         iobase = pci_resource_start(pdev, 0);
1698         mapbase = pci_resource_start(pdev, 1);
1699         priv->mapbase = mapbase;
1700         priv->iobase = iobase;
1701         priv->pdev = pdev;
1702         priv->tx_empty = 1;
1703         priv->rxbuf.buf = rxbuf;
1704         priv->rxbuf.size = PAGE_SIZE;
1705
1706         priv->fifo_size = fifosize;
1707         priv->uartclk = pch_uart_get_uartclk();
1708         priv->port_type = PORT_MAX_8250 + port_type + 1;
1709         priv->port.dev = &pdev->dev;
1710         priv->port.iobase = iobase;
1711         priv->port.membase = NULL;
1712         priv->port.mapbase = mapbase;
1713         priv->port.irq = pdev->irq;
1714         priv->port.iotype = UPIO_PORT;
1715         priv->port.ops = &pch_uart_ops;
1716         priv->port.flags = UPF_BOOT_AUTOCONF;
1717         priv->port.fifosize = fifosize;
1718         priv->port.line = board->line_no;
1719         priv->trigger = PCH_UART_HAL_TRIGGER_M;
1720
1721         spin_lock_init(&priv->port.lock);
1722
1723         pci_set_drvdata(pdev, priv);
1724         priv->trigger_level = 1;
1725         priv->fcr = 0;
1726
1727 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1728         pch_uart_ports[board->line_no] = priv;
1729 #endif
1730         ret = uart_add_one_port(&pch_uart_driver, &priv->port);
1731         if (ret < 0)
1732                 goto init_port_hal_free;
1733
1734 #ifdef CONFIG_DEBUG_FS
1735         snprintf(name, sizeof(name), "uart%d_regs", board->line_no);
1736         priv->debugfs = debugfs_create_file(name, S_IFREG | S_IRUGO,
1737                                 NULL, priv, &port_regs_ops);
1738 #endif
1739
1740         return priv;
1741
1742 init_port_hal_free:
1743 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1744         pch_uart_ports[board->line_no] = NULL;
1745 #endif
1746         free_page((unsigned long)rxbuf);
1747 init_port_free_txbuf:
1748         kfree(priv);
1749 init_port_alloc_err:
1750
1751         return NULL;
1752 }
1753
1754 static void pch_uart_exit_port(struct eg20t_port *priv)
1755 {
1756
1757 #ifdef CONFIG_DEBUG_FS
1758         if (priv->debugfs)
1759                 debugfs_remove(priv->debugfs);
1760 #endif
1761         uart_remove_one_port(&pch_uart_driver, &priv->port);
1762         pci_set_drvdata(priv->pdev, NULL);
1763         free_page((unsigned long)priv->rxbuf.buf);
1764 }
1765
1766 static void pch_uart_pci_remove(struct pci_dev *pdev)
1767 {
1768         struct eg20t_port *priv = pci_get_drvdata(pdev);
1769
1770         pci_disable_msi(pdev);
1771
1772 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1773         pch_uart_ports[priv->port.line] = NULL;
1774 #endif
1775         pch_uart_exit_port(priv);
1776         pci_disable_device(pdev);
1777         kfree(priv);
1778         return;
1779 }
1780 #ifdef CONFIG_PM
1781 static int pch_uart_pci_suspend(struct pci_dev *pdev, pm_message_t state)
1782 {
1783         struct eg20t_port *priv = pci_get_drvdata(pdev);
1784
1785         uart_suspend_port(&pch_uart_driver, &priv->port);
1786
1787         pci_save_state(pdev);
1788         pci_set_power_state(pdev, pci_choose_state(pdev, state));
1789         return 0;
1790 }
1791
1792 static int pch_uart_pci_resume(struct pci_dev *pdev)
1793 {
1794         struct eg20t_port *priv = pci_get_drvdata(pdev);
1795         int ret;
1796
1797         pci_set_power_state(pdev, PCI_D0);
1798         pci_restore_state(pdev);
1799
1800         ret = pci_enable_device(pdev);
1801         if (ret) {
1802                 dev_err(&pdev->dev,
1803                 "%s-pci_enable_device failed(ret=%d) ", __func__, ret);
1804                 return ret;
1805         }
1806
1807         uart_resume_port(&pch_uart_driver, &priv->port);
1808
1809         return 0;
1810 }
1811 #else
1812 #define pch_uart_pci_suspend NULL
1813 #define pch_uart_pci_resume NULL
1814 #endif
1815
1816 static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
1817         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
1818          .driver_data = pch_et20t_uart0},
1819         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
1820          .driver_data = pch_et20t_uart1},
1821         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
1822          .driver_data = pch_et20t_uart2},
1823         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
1824          .driver_data = pch_et20t_uart3},
1825         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
1826          .driver_data = pch_ml7213_uart0},
1827         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
1828          .driver_data = pch_ml7213_uart1},
1829         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
1830          .driver_data = pch_ml7213_uart2},
1831         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C),
1832          .driver_data = pch_ml7223_uart0},
1833         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D),
1834          .driver_data = pch_ml7223_uart1},
1835         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8811),
1836          .driver_data = pch_ml7831_uart0},
1837         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8812),
1838          .driver_data = pch_ml7831_uart1},
1839         {0,},
1840 };
1841
1842 static int pch_uart_pci_probe(struct pci_dev *pdev,
1843                                         const struct pci_device_id *id)
1844 {
1845         int ret;
1846         struct eg20t_port *priv;
1847
1848         ret = pci_enable_device(pdev);
1849         if (ret < 0)
1850                 goto probe_error;
1851
1852         priv = pch_uart_init_port(pdev, id);
1853         if (!priv) {
1854                 ret = -EBUSY;
1855                 goto probe_disable_device;
1856         }
1857         pci_set_drvdata(pdev, priv);
1858
1859         return ret;
1860
1861 probe_disable_device:
1862         pci_disable_msi(pdev);
1863         pci_disable_device(pdev);
1864 probe_error:
1865         return ret;
1866 }
1867
1868 static struct pci_driver pch_uart_pci_driver = {
1869         .name = "pch_uart",
1870         .id_table = pch_uart_pci_id,
1871         .probe = pch_uart_pci_probe,
1872         .remove = pch_uart_pci_remove,
1873         .suspend = pch_uart_pci_suspend,
1874         .resume = pch_uart_pci_resume,
1875 };
1876
1877 static int __init pch_uart_module_init(void)
1878 {
1879         int ret;
1880
1881         /* register as UART driver */
1882         ret = uart_register_driver(&pch_uart_driver);
1883         if (ret < 0)
1884                 return ret;
1885
1886         /* register as PCI driver */
1887         ret = pci_register_driver(&pch_uart_pci_driver);
1888         if (ret < 0)
1889                 uart_unregister_driver(&pch_uart_driver);
1890
1891         return ret;
1892 }
1893 module_init(pch_uart_module_init);
1894
1895 static void __exit pch_uart_module_exit(void)
1896 {
1897         pci_unregister_driver(&pch_uart_pci_driver);
1898         uart_unregister_driver(&pch_uart_driver);
1899 }
1900 module_exit(pch_uart_module_exit);
1901
1902 MODULE_LICENSE("GPL v2");
1903 MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
1904 module_param(default_baud, uint, S_IRUGO);
1905 MODULE_PARM_DESC(default_baud,
1906                  "Default BAUD for initial driver state and console (default 9600)");
1907 module_param(user_uartclk, uint, S_IRUGO);
1908 MODULE_PARM_DESC(user_uartclk,
1909                  "Override UART default or board specific UART clock");