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         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 /* Return UART clock, checking for board specific clocks. */
 377 static int pch_uart_get_uartclk(void)
 378 {
 379         const char *cmp;
 380
 381         if (user_uartclk)
 382                 return user_uartclk;
 383
 384         cmp = dmi_get_system_info(DMI_BOARD_NAME);
 385         if (cmp && strstr(cmp, "CM-iTC"))
 386                 return CMITC_UARTCLK;
 387
 388         cmp = dmi_get_system_info(DMI_BIOS_VERSION);
 389         if (cmp && strnstr(cmp, "FRI2", 4))
 390                 return FRI2_64_UARTCLK;
 391
 392         cmp = dmi_get_system_info(DMI_PRODUCT_NAME);
 393         if (cmp && strstr(cmp, "Fish River Island II"))
 394                 return FRI2_48_UARTCLK;
 395
 396         /* Kontron COMe-mTT10 (nanoETXexpress-TT) */
 397         cmp = dmi_get_system_info(DMI_BOARD_NAME);
 398         if (cmp && (strstr(cmp, "COMe-mTT") ||
 399                     strstr(cmp, "nanoETXexpress-TT")))
 400                 return NTC1_UARTCLK;
 401
 402         cmp = dmi_get_system_info(DMI_BOARD_NAME);
 403         if (cmp && strstr(cmp, "MinnowBoard"))
 404                 return MINNOW_UARTCLK;
 405
 406         return DEFAULT_UARTCLK;
 407 }
 408
 409 static void pch_uart_hal_enable_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 void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
 418                                            unsigned int flag)
 419 {
 420         u8 ier = ioread8(priv->membase + UART_IER);
 421         ier &= ~(flag & PCH_UART_IER_MASK);
 422         iowrite8(ier, priv->membase + UART_IER);
 423 }
 424
 425 static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud,
 426                                  unsigned int parity, unsigned int bits,
 427                                  unsigned int stb)
 428 {
 429         unsigned int dll, dlm, lcr;
 430         int div;
 431
 432         div = DIV_ROUND_CLOSEST(priv->uartclk / 16, baud);
 433         if (div < 0 || USHRT_MAX <= div) {
 434                 dev_err(priv->port.dev, "Invalid Baud(div=0x%x)\n", div);
 435                 return -EINVAL;
 436         }
 437
 438         dll = (unsigned int)div & 0x00FFU;
 439         dlm = ((unsigned int)div >> 8) & 0x00FFU;
 440
 441         if (parity & ~(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS | PCH_UART_LCR_SP)) {
 442                 dev_err(priv->port.dev, "Invalid parity(0x%x)\n", parity);
 443                 return -EINVAL;
 444         }
 445
 446         if (bits & ~PCH_UART_LCR_WLS) {
 447                 dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits);
 448                 return -EINVAL;
 449         }
 450
 451         if (stb & ~PCH_UART_LCR_STB) {
 452                 dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb);
 453                 return -EINVAL;
 454         }
 455
 456         lcr = parity;
 457         lcr |= bits;
 458         lcr |= stb;
 459
 460         dev_dbg(priv->port.dev, "%s:baud = %d, div = %04x, lcr = %02x (%lu)\n",
 461                  __func__, baud, div, lcr, jiffies);
 462         iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
 463         iowrite8(dll, priv->membase + PCH_UART_DLL);
 464         iowrite8(dlm, priv->membase + PCH_UART_DLM);
 465         iowrite8(lcr, priv->membase + UART_LCR);
 466
 467         return 0;
 468 }
 469
 470 static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
 471                                     unsigned int flag)
 472 {
 473         if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) {
 474                 dev_err(priv->port.dev, "%s:Invalid flag(0x%x)\n",
 475                         __func__, flag);
 476                 return -EINVAL;
 477         }
 478
 479         iowrite8(PCH_UART_FCR_FIFOE | priv->fcr, priv->membase + UART_FCR);
 480         iowrite8(PCH_UART_FCR_FIFOE | priv->fcr | flag,
 481                  priv->membase + UART_FCR);
 482         iowrite8(priv->fcr, priv->membase + UART_FCR);
 483
 484         return 0;
 485 }
 486
 487 static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
 488                                  unsigned int dmamode,
 489                                  unsigned int fifo_size, unsigned int trigger)
 490 {
 491         u8 fcr;
 492
 493         if (dmamode & ~PCH_UART_FCR_DMS) {
 494                 dev_err(priv->port.dev, "%s:Invalid DMA Mode(0x%x)\n",
 495                         __func__, dmamode);
 496                 return -EINVAL;
 497         }
 498
 499         if (fifo_size & ~(PCH_UART_FCR_FIFOE | PCH_UART_FCR_FIFO256)) {
 500                 dev_err(priv->port.dev, "%s:Invalid FIFO SIZE(0x%x)\n",
 501                         __func__, fifo_size);
 502                 return -EINVAL;
 503         }
 504
 505         if (trigger & ~PCH_UART_FCR_RFTL) {
 506                 dev_err(priv->port.dev, "%s:Invalid TRIGGER(0x%x)\n",
 507                         __func__, trigger);
 508                 return -EINVAL;
 509         }
 510
 511         switch (priv->fifo_size) {
 512         case 256:
 513                 priv->trigger_level =
 514                     trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 515                 break;
 516         case 64:
 517                 priv->trigger_level =
 518                     trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 519                 break;
 520         case 16:
 521                 priv->trigger_level =
 522                     trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 523                 break;
 524         default:
 525                 priv->trigger_level =
 526                     trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT];
 527                 break;
 528         }
 529         fcr =
 530             dmamode | fifo_size | trigger | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR;
 531         iowrite8(PCH_UART_FCR_FIFOE, priv->membase + UART_FCR);
 532         iowrite8(PCH_UART_FCR_FIFOE | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR,
 533                  priv->membase + UART_FCR);
 534         iowrite8(fcr, priv->membase + UART_FCR);
 535         priv->fcr = fcr;
 536
 537         return 0;
 538 }
 539
 540 static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
 541 {
 542         unsigned int msr = ioread8(priv->membase + UART_MSR);
 543         priv->dmsr = msr & PCH_UART_MSR_DELTA;
 544         return (u8)msr;
 545 }
 546
 547 static void pch_uart_hal_write(struct eg20t_port *priv,
 548                               const unsigned char *buf, int tx_size)
 549 {
 550         int i;
 551         unsigned int thr;
 552
 553         for (i = 0; i < tx_size;) {
 554                 thr = buf[i++];
 555                 iowrite8(thr, priv->membase + PCH_UART_THR);
 556         }
 557 }
 558
 559 static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
 560                              int rx_size)
 561 {
 562         int i;
 563         u8 rbr, lsr;
 564         struct uart_port *port = &priv->port;
 565
 566         lsr = ioread8(priv->membase + UART_LSR);
 567         for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
 568              i < rx_size && lsr & (UART_LSR_DR | UART_LSR_BI);
 569              lsr = ioread8(priv->membase + UART_LSR)) {
 570                 rbr = ioread8(priv->membase + PCH_UART_RBR);
 571
 572                 if (lsr & UART_LSR_BI) {
 573                         port->icount.brk++;
 574                         if (uart_handle_break(port))
 575                                 continue;
 576                 }
 577 #ifdef SUPPORT_SYSRQ
 578                 if (port->sysrq) {
 579                         if (uart_handle_sysrq_char(port, rbr))
 580                                 continue;
 581                 }
 582 #endif
 583
 584                 buf[i++] = rbr;
 585         }
 586         return i;
 587 }
 588
 589 static unsigned char pch_uart_hal_get_iid(struct eg20t_port *priv)
 590 {
 591         return ioread8(priv->membase + UART_IIR) &\
 592                       (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP);
 593 }
 594
 595 static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
 596 {
 597         return ioread8(priv->membase + UART_LSR);
 598 }
 599
 600 static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
 601 {
 602         unsigned int lcr;
 603
 604         lcr = ioread8(priv->membase + UART_LCR);
 605         if (on)
 606                 lcr |= PCH_UART_LCR_SB;
 607         else
 608                 lcr &= ~PCH_UART_LCR_SB;
 609
 610         iowrite8(lcr, priv->membase + UART_LCR);
 611 }
 612
 613 static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
 614                    int size)
 615 {
 616         struct uart_port *port = &priv->port;
 617         struct tty_port *tport = &port->state->port;
 618
 619         tty_insert_flip_string(tport, buf, size);
 620         tty_flip_buffer_push(tport);
 621
 622         return 0;
 623 }
 624
 625 static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf)
 626 {
 627         int ret = 0;
 628         struct uart_port *port = &priv->port;
 629
 630         if (port->x_char) {
 631                 dev_dbg(priv->port.dev, "%s:X character send %02x (%lu)\n",
 632                         __func__, port->x_char, jiffies);
 633                 buf[0] = port->x_char;
 634                 port->x_char = 0;
 635                 ret = 1;
 636         }
 637
 638         return ret;
 639 }
 640
 641 static int dma_push_rx(struct eg20t_port *priv, int size)
 642 {
 643         struct tty_struct *tty;
 644         int room;
 645         struct uart_port *port = &priv->port;
 646         struct tty_port *tport = &port->state->port;
 647
 648         port = &priv->port;
 649         tty = tty_port_tty_get(tport);
 650         if (!tty) {
 651                 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
 652                 return 0;
 653         }
 654
 655         room = tty_buffer_request_room(tport, size);
 656
 657         if (room < size)
 658                 dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
 659                          size - room);
 660         if (!room)
 661                 return room;
 662
 663         tty_insert_flip_string(tport, sg_virt(&priv->sg_rx), size);
 664
 665         port->icount.rx += room;
 666         tty_kref_put(tty);
 667
 668         return room;
 669 }
 670
 671 static void pch_free_dma(struct uart_port *port)
 672 {
 673         struct eg20t_port *priv;
 674         priv = container_of(port, struct eg20t_port, port);
 675
 676         if (priv->chan_tx) {
 677                 dma_release_channel(priv->chan_tx);
 678                 priv->chan_tx = NULL;
 679         }
 680         if (priv->chan_rx) {
 681                 dma_release_channel(priv->chan_rx);
 682                 priv->chan_rx = NULL;
 683         }
 684
 685         if (priv->rx_buf_dma) {
 686                 dma_free_coherent(port->dev, port->fifosize, priv->rx_buf_virt,
 687                                   priv->rx_buf_dma);
 688                 priv->rx_buf_virt = NULL;
 689                 priv->rx_buf_dma = 0;
 690         }
 691
 692         return;
 693 }
 694
 695 static bool filter(struct dma_chan *chan, void *slave)
 696 {
 697         struct pch_dma_slave *param = slave;
 698
 699         if ((chan->chan_id == param->chan_id) && (param->dma_dev ==
 700                                                   chan->device->dev)) {
 701                 chan->private = param;
 702                 return true;
 703         } else {
 704                 return false;
 705         }
 706 }
 707
 708 static void pch_request_dma(struct uart_port *port)
 709 {
 710         dma_cap_mask_t mask;
 711         struct dma_chan *chan;
 712         struct pci_dev *dma_dev;
 713         struct pch_dma_slave *param;
 714         struct eg20t_port *priv =
 715                                 container_of(port, struct eg20t_port, port);
 716         dma_cap_zero(mask);
 717         dma_cap_set(DMA_SLAVE, mask);
 718
 719         dma_dev = pci_get_bus_and_slot(priv->pdev->bus->number,
 720                                        PCI_DEVFN(0xa, 0)); /* Get DMA's dev
 721                                                                 information */
 722         /* Set Tx DMA */
 723         param = &priv->param_tx;
 724         param->dma_dev = &dma_dev->dev;
 725         param->chan_id = priv->port.line * 2; /* Tx = 0, 2, 4, ... */
 726
 727         param->tx_reg = port->mapbase + UART_TX;
 728         chan = dma_request_channel(mask, filter, param);
 729         if (!chan) {
 730                 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
 731                         __func__);
 732                 return;
 733         }
 734         priv->chan_tx = chan;
 735
 736         /* Set Rx DMA */
 737         param = &priv->param_rx;
 738         param->dma_dev = &dma_dev->dev;
 739         param->chan_id = priv->port.line * 2 + 1; /* Rx = Tx + 1 */
 740
 741         param->rx_reg = port->mapbase + UART_RX;
 742         chan = dma_request_channel(mask, filter, param);
 743         if (!chan) {
 744                 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Rx)\n",
 745                         __func__);
 746                 dma_release_channel(priv->chan_tx);
 747                 priv->chan_tx = NULL;
 748                 return;
 749         }
 750
 751         /* Get Consistent memory for DMA */
 752         priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
 753                                     &priv->rx_buf_dma, GFP_KERNEL);
 754         priv->chan_rx = chan;
 755 }
 756
 757 static void pch_dma_rx_complete(void *arg)
 758 {
 759         struct eg20t_port *priv = arg;
 760         struct uart_port *port = &priv->port;
 761         int count;
 762
 763         dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
 764         count = dma_push_rx(priv, priv->trigger_level);
 765         if (count)
 766                 tty_flip_buffer_push(&port->state->port);
 767         async_tx_ack(priv->desc_rx);
 768         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
 769                                             PCH_UART_HAL_RX_ERR_INT);
 770 }
 771
 772 static void pch_dma_tx_complete(void *arg)
 773 {
 774         struct eg20t_port *priv = arg;
 775         struct uart_port *port = &priv->port;
 776         struct circ_buf *xmit = &port->state->xmit;
 777         struct scatterlist *sg = priv->sg_tx_p;
 778         int i;
 779
 780         for (i = 0; i < priv->nent; i++, sg++) {
 781                 xmit->tail += sg_dma_len(sg);
 782                 port->icount.tx += sg_dma_len(sg);
 783         }
 784         xmit->tail &= UART_XMIT_SIZE - 1;
 785         async_tx_ack(priv->desc_tx);
 786         dma_unmap_sg(port->dev, sg, priv->nent, DMA_TO_DEVICE);
 787         priv->tx_dma_use = 0;
 788         priv->nent = 0;
 789         kfree(priv->sg_tx_p);
 790         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
 791 }
 792
 793 static int pop_tx(struct eg20t_port *priv, int size)
 794 {
 795         int count = 0;
 796         struct uart_port *port = &priv->port;
 797         struct circ_buf *xmit = &port->state->xmit;
 798
 799         if (uart_tx_stopped(port) || uart_circ_empty(xmit) || count >= size)
 800                 goto pop_tx_end;
 801
 802         do {
 803                 int cnt_to_end =
 804                     CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
 805                 int sz = min(size - count, cnt_to_end);
 806                 pch_uart_hal_write(priv, &xmit->buf[xmit->tail], sz);
 807                 xmit->tail = (xmit->tail + sz) & (UART_XMIT_SIZE - 1);
 808                 count += sz;
 809         } while (!uart_circ_empty(xmit) && count < size);
 810
 811 pop_tx_end:
 812         dev_dbg(priv->port.dev, "%d characters. Remained %d characters.(%lu)\n",
 813                  count, size - count, jiffies);
 814
 815         return count;
 816 }
 817
 818 static int handle_rx_to(struct eg20t_port *priv)
 819 {
 820         struct pch_uart_buffer *buf;
 821         int rx_size;
 822         int ret;
 823         if (!priv->start_rx) {
 824                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
 825                                                      PCH_UART_HAL_RX_ERR_INT);
 826                 return 0;
 827         }
 828         buf = &priv->rxbuf;
 829         do {
 830                 rx_size = pch_uart_hal_read(priv, buf->buf, buf->size);
 831                 ret = push_rx(priv, buf->buf, rx_size);
 832                 if (ret)
 833                         return 0;
 834         } while (rx_size == buf->size);
 835
 836         return PCH_UART_HANDLED_RX_INT;
 837 }
 838
 839 static int handle_rx(struct eg20t_port *priv)
 840 {
 841         return handle_rx_to(priv);
 842 }
 843
 844 static int dma_handle_rx(struct eg20t_port *priv)
 845 {
 846         struct uart_port *port = &priv->port;
 847         struct dma_async_tx_descriptor *desc;
 848         struct scatterlist *sg;
 849
 850         priv = container_of(port, struct eg20t_port, port);
 851         sg = &priv->sg_rx;
 852
 853         sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */
 854
 855         sg_dma_len(sg) = priv->trigger_level;
 856
 857         sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt),
 858                      sg_dma_len(sg), (unsigned long)priv->rx_buf_virt &
 859                      ~PAGE_MASK);
 860
 861         sg_dma_address(sg) = priv->rx_buf_dma;
 862
 863         desc = dmaengine_prep_slave_sg(priv->chan_rx,
 864                         sg, 1, DMA_DEV_TO_MEM,
 865                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 866
 867         if (!desc)
 868                 return 0;
 869
 870         priv->desc_rx = desc;
 871         desc->callback = pch_dma_rx_complete;
 872         desc->callback_param = priv;
 873         desc->tx_submit(desc);
 874         dma_async_issue_pending(priv->chan_rx);
 875
 876         return PCH_UART_HANDLED_RX_INT;
 877 }
 878
 879 static unsigned int handle_tx(struct eg20t_port *priv)
 880 {
 881         struct uart_port *port = &priv->port;
 882         struct circ_buf *xmit = &port->state->xmit;
 883         int fifo_size;
 884         int tx_size;
 885         int size;
 886         int tx_empty;
 887
 888         if (!priv->start_tx) {
 889                 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
 890                         __func__, jiffies);
 891                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 892                 priv->tx_empty = 1;
 893                 return 0;
 894         }
 895
 896         fifo_size = max(priv->fifo_size, 1);
 897         tx_empty = 1;
 898         if (pop_tx_x(priv, xmit->buf)) {
 899                 pch_uart_hal_write(priv, xmit->buf, 1);
 900                 port->icount.tx++;
 901                 tx_empty = 0;
 902                 fifo_size--;
 903         }
 904         size = min(xmit->head - xmit->tail, fifo_size);
 905         if (size < 0)
 906                 size = fifo_size;
 907
 908         tx_size = pop_tx(priv, size);
 909         if (tx_size > 0) {
 910                 port->icount.tx += tx_size;
 911                 tx_empty = 0;
 912         }
 913
 914         priv->tx_empty = tx_empty;
 915
 916         if (tx_empty) {
 917                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 918                 uart_write_wakeup(port);
 919         }
 920
 921         return PCH_UART_HANDLED_TX_INT;
 922 }
 923
 924 static unsigned int dma_handle_tx(struct eg20t_port *priv)
 925 {
 926         struct uart_port *port = &priv->port;
 927         struct circ_buf *xmit = &port->state->xmit;
 928         struct scatterlist *sg;
 929         int nent;
 930         int fifo_size;
 931         int tx_empty;
 932         struct dma_async_tx_descriptor *desc;
 933         int num;
 934         int i;
 935         int bytes;
 936         int size;
 937         int rem;
 938
 939         if (!priv->start_tx) {
 940                 dev_info(priv->port.dev, "%s:Tx isn't started. (%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         if (priv->tx_dma_use) {
 948                 dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n",
 949                         __func__, jiffies);
 950                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 951                 priv->tx_empty = 1;
 952                 return 0;
 953         }
 954
 955         fifo_size = max(priv->fifo_size, 1);
 956         tx_empty = 1;
 957         if (pop_tx_x(priv, xmit->buf)) {
 958                 pch_uart_hal_write(priv, xmit->buf, 1);
 959                 port->icount.tx++;
 960                 tx_empty = 0;
 961                 fifo_size--;
 962         }
 963
 964         bytes = min((int)CIRC_CNT(xmit->head, xmit->tail,
 965                              UART_XMIT_SIZE), CIRC_CNT_TO_END(xmit->head,
 966                              xmit->tail, UART_XMIT_SIZE));
 967         if (!bytes) {
 968                 dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__);
 969                 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
 970                 uart_write_wakeup(port);
 971                 return 0;
 972         }
 973
 974         if (bytes > fifo_size) {
 975                 num = bytes / fifo_size + 1;
 976                 size = fifo_size;
 977                 rem = bytes % fifo_size;
 978         } else {
 979                 num = 1;
 980                 size = bytes;
 981                 rem = bytes;
 982         }
 983
 984         dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n",
 985                 __func__, num, size, rem);
 986
 987         priv->tx_dma_use = 1;
 988
 989         priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
 990         if (!priv->sg_tx_p) {
 991                 dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__);
 992                 return 0;
 993         }
 994
 995         sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
 996         sg = priv->sg_tx_p;
 997
 998         for (i = 0; i < num; i++, sg++) {
 999                 if (i == (num - 1))
1000                         sg_set_page(sg, virt_to_page(xmit->buf),
1001                                     rem, fifo_size * i);
1002                 else
1003                         sg_set_page(sg, virt_to_page(xmit->buf),
1004                                     size, fifo_size * i);
1005         }
1006
1007         sg = priv->sg_tx_p;
1008         nent = dma_map_sg(port->dev, sg, num, DMA_TO_DEVICE);
1009         if (!nent) {
1010                 dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__);
1011                 return 0;
1012         }
1013         priv->nent = nent;
1014
1015         for (i = 0; i < nent; i++, sg++) {
1016                 sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) +
1017                               fifo_size * i;
1018                 sg_dma_address(sg) = (sg_dma_address(sg) &
1019                                     ~(UART_XMIT_SIZE - 1)) + sg->offset;
1020                 if (i == (nent - 1))
1021                         sg_dma_len(sg) = rem;
1022                 else
1023                         sg_dma_len(sg) = size;
1024         }
1025
1026         desc = dmaengine_prep_slave_sg(priv->chan_tx,
1027                                         priv->sg_tx_p, nent, DMA_MEM_TO_DEV,
1028                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1029         if (!desc) {
1030                 dev_err(priv->port.dev, "%s:device_prep_slave_sg Failed\n",
1031                         __func__);
1032                 return 0;
1033         }
1034         dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE);
1035         priv->desc_tx = desc;
1036         desc->callback = pch_dma_tx_complete;
1037         desc->callback_param = priv;
1038
1039         desc->tx_submit(desc);
1040
1041         dma_async_issue_pending(priv->chan_tx);
1042
1043         return PCH_UART_HANDLED_TX_INT;
1044 }
1045
1046 static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
1047 {
1048         struct uart_port *port = &priv->port;
1049         struct tty_struct *tty = tty_port_tty_get(&port->state->port);
1050         char   *error_msg[5] = {};
1051         int    i = 0;
1052
1053         if (lsr & PCH_UART_LSR_ERR)
1054                 error_msg[i++] = "Error data in FIFO\n";
1055
1056         if (lsr & UART_LSR_FE) {
1057                 port->icount.frame++;
1058                 error_msg[i++] = "  Framing Error\n";
1059         }
1060
1061         if (lsr & UART_LSR_PE) {
1062                 port->icount.parity++;
1063                 error_msg[i++] = "  Parity Error\n";
1064         }
1065
1066         if (lsr & UART_LSR_OE) {
1067                 port->icount.overrun++;
1068                 error_msg[i++] = "  Overrun Error\n";
1069         }
1070
1071         if (tty == NULL) {
1072                 for (i = 0; error_msg[i] != NULL; i++)
1073                         dev_err(&priv->pdev->dev, error_msg[i]);
1074         } else {
1075                 tty_kref_put(tty);
1076         }
1077 }
1078
1079 static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
1080 {
1081         struct eg20t_port *priv = dev_id;
1082         unsigned int handled;
1083         u8 lsr;
1084         int ret = 0;
1085         unsigned char iid;
1086         unsigned long flags;
1087         int next = 1;
1088         u8 msr;
1089
1090         spin_lock_irqsave(&priv->lock, flags);
1091         handled = 0;
1092         while (next) {
1093                 iid = pch_uart_hal_get_iid(priv);
1094                 if (iid & PCH_UART_IIR_IP) /* No Interrupt */
1095                         break;
1096                 switch (iid) {
1097                 case PCH_UART_IID_RLS:  /* Receiver Line Status */
1098                         lsr = pch_uart_hal_get_line_status(priv);
1099                         if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
1100                                                 UART_LSR_PE | UART_LSR_OE)) {
1101                                 pch_uart_err_ir(priv, lsr);
1102                                 ret = PCH_UART_HANDLED_RX_ERR_INT;
1103                         } else {
1104                                 ret = PCH_UART_HANDLED_LS_INT;
1105                         }
1106                         break;
1107                 case PCH_UART_IID_RDR:  /* Received Data Ready */
1108                         if (priv->use_dma) {
1109                                 pch_uart_hal_disable_interrupt(priv,
1110                                                 PCH_UART_HAL_RX_INT |
1111                                                 PCH_UART_HAL_RX_ERR_INT);
1112                                 ret = dma_handle_rx(priv);
1113                                 if (!ret)
1114                                         pch_uart_hal_enable_interrupt(priv,
1115                                                 PCH_UART_HAL_RX_INT |
1116                                                 PCH_UART_HAL_RX_ERR_INT);
1117                         } else {
1118                                 ret = handle_rx(priv);
1119                         }
1120                         break;
1121                 case PCH_UART_IID_RDR_TO:       /* Received Data Ready
1122                                                    (FIFO Timeout) */
1123                         ret = handle_rx_to(priv);
1124                         break;
1125                 case PCH_UART_IID_THRE: /* Transmitter Holding Register
1126                                                    Empty */
1127                         if (priv->use_dma)
1128                                 ret = dma_handle_tx(priv);
1129                         else
1130                                 ret = handle_tx(priv);
1131                         break;
1132                 case PCH_UART_IID_MS:   /* Modem Status */
1133                         msr = pch_uart_hal_get_modem(priv);
1134                         next = 0; /* MS ir prioirty is the lowest. So, MS ir
1135                                      means final interrupt */
1136                         if ((msr & UART_MSR_ANY_DELTA) == 0)
1137                                 break;
1138                         ret |= PCH_UART_HANDLED_MS_INT;
1139                         break;
1140                 default:        /* Never junp to this label */
1141                         dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__,
1142                                 iid, jiffies);
1143                         ret = -1;
1144                         next = 0;
1145                         break;
1146                 }
1147                 handled |= (unsigned int)ret;
1148         }
1149
1150         spin_unlock_irqrestore(&priv->lock, flags);
1151         return IRQ_RETVAL(handled);
1152 }
1153
1154 /* This function tests whether the transmitter fifo and shifter for the port
1155                                                 described by 'port' is empty. */
1156 static unsigned int pch_uart_tx_empty(struct uart_port *port)
1157 {
1158         struct eg20t_port *priv;
1159
1160         priv = container_of(port, struct eg20t_port, port);
1161         if (priv->tx_empty)
1162                 return TIOCSER_TEMT;
1163         else
1164                 return 0;
1165 }
1166
1167 /* Returns the current state of modem control inputs. */
1168 static unsigned int pch_uart_get_mctrl(struct uart_port *port)
1169 {
1170         struct eg20t_port *priv;
1171         u8 modem;
1172         unsigned int ret = 0;
1173
1174         priv = container_of(port, struct eg20t_port, port);
1175         modem = pch_uart_hal_get_modem(priv);
1176
1177         if (modem & UART_MSR_DCD)
1178                 ret |= TIOCM_CAR;
1179
1180         if (modem & UART_MSR_RI)
1181                 ret |= TIOCM_RNG;
1182
1183         if (modem & UART_MSR_DSR)
1184                 ret |= TIOCM_DSR;
1185
1186         if (modem & UART_MSR_CTS)
1187                 ret |= TIOCM_CTS;
1188
1189         return ret;
1190 }
1191
1192 static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1193 {
1194         u32 mcr = 0;
1195         struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
1196
1197         if (mctrl & TIOCM_DTR)
1198                 mcr |= UART_MCR_DTR;
1199         if (mctrl & TIOCM_RTS)
1200                 mcr |= UART_MCR_RTS;
1201         if (mctrl & TIOCM_LOOP)
1202                 mcr |= UART_MCR_LOOP;
1203
1204         if (priv->mcr & UART_MCR_AFE)
1205                 mcr |= UART_MCR_AFE;
1206
1207         if (mctrl)
1208                 iowrite8(mcr, priv->membase + UART_MCR);
1209 }
1210
1211 static void pch_uart_stop_tx(struct uart_port *port)
1212 {
1213         struct eg20t_port *priv;
1214         priv = container_of(port, struct eg20t_port, port);
1215         priv->start_tx = 0;
1216         priv->tx_dma_use = 0;
1217 }
1218
1219 static void pch_uart_start_tx(struct uart_port *port)
1220 {
1221         struct eg20t_port *priv;
1222
1223         priv = container_of(port, struct eg20t_port, port);
1224
1225         if (priv->use_dma) {
1226                 if (priv->tx_dma_use) {
1227                         dev_dbg(priv->port.dev, "%s : Tx DMA is NOT empty.\n",
1228                                 __func__);
1229                         return;
1230                 }
1231         }
1232
1233         priv->start_tx = 1;
1234         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
1235 }
1236
1237 static void pch_uart_stop_rx(struct uart_port *port)
1238 {
1239         struct eg20t_port *priv;
1240         priv = container_of(port, struct eg20t_port, port);
1241         priv->start_rx = 0;
1242         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
1243                                              PCH_UART_HAL_RX_ERR_INT);
1244 }
1245
1246 /* Enable the modem status interrupts. */
1247 static void pch_uart_enable_ms(struct uart_port *port)
1248 {
1249         struct eg20t_port *priv;
1250         priv = container_of(port, struct eg20t_port, port);
1251         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
1252 }
1253
1254 /* Control the transmission of a break signal. */
1255 static void pch_uart_break_ctl(struct uart_port *port, int ctl)
1256 {
1257         struct eg20t_port *priv;
1258         unsigned long flags;
1259
1260         priv = container_of(port, struct eg20t_port, port);
1261         spin_lock_irqsave(&priv->lock, flags);
1262         pch_uart_hal_set_break(priv, ctl);
1263         spin_unlock_irqrestore(&priv->lock, flags);
1264 }
1265
1266 /* Grab any interrupt resources and initialise any low level driver state. */
1267 static int pch_uart_startup(struct uart_port *port)
1268 {
1269         struct eg20t_port *priv;
1270         int ret;
1271         int fifo_size;
1272         int trigger_level;
1273
1274         priv = container_of(port, struct eg20t_port, port);
1275         priv->tx_empty = 1;
1276
1277         if (port->uartclk)
1278                 priv->uartclk = port->uartclk;
1279         else
1280                 port->uartclk = priv->uartclk;
1281
1282         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1283         ret = pch_uart_hal_set_line(priv, default_baud,
1284                               PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
1285                               PCH_UART_HAL_STB1);
1286         if (ret)
1287                 return ret;
1288
1289         switch (priv->fifo_size) {
1290         case 256:
1291                 fifo_size = PCH_UART_HAL_FIFO256;
1292                 break;
1293         case 64:
1294                 fifo_size = PCH_UART_HAL_FIFO64;
1295                 break;
1296         case 16:
1297                 fifo_size = PCH_UART_HAL_FIFO16;
1298                 break;
1299         case 1:
1300         default:
1301                 fifo_size = PCH_UART_HAL_FIFO_DIS;
1302                 break;
1303         }
1304
1305         switch (priv->trigger) {
1306         case PCH_UART_HAL_TRIGGER1:
1307                 trigger_level = 1;
1308                 break;
1309         case PCH_UART_HAL_TRIGGER_L:
1310                 trigger_level = priv->fifo_size / 4;
1311                 break;
1312         case PCH_UART_HAL_TRIGGER_M:
1313                 trigger_level = priv->fifo_size / 2;
1314                 break;
1315         case PCH_UART_HAL_TRIGGER_H:
1316         default:
1317                 trigger_level = priv->fifo_size - (priv->fifo_size / 8);
1318                 break;
1319         }
1320
1321         priv->trigger_level = trigger_level;
1322         ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1323                                     fifo_size, priv->trigger);
1324         if (ret < 0)
1325                 return ret;
1326
1327         ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
1328                         KBUILD_MODNAME, priv);
1329         if (ret < 0)
1330                 return ret;
1331
1332         if (priv->use_dma)
1333                 pch_request_dma(port);
1334
1335         priv->start_rx = 1;
1336         pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
1337                                             PCH_UART_HAL_RX_ERR_INT);
1338         uart_update_timeout(port, CS8, default_baud);
1339
1340         return 0;
1341 }
1342
1343 static void pch_uart_shutdown(struct uart_port *port)
1344 {
1345         struct eg20t_port *priv;
1346         int ret;
1347
1348         priv = container_of(port, struct eg20t_port, port);
1349         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1350         pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
1351         ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1352                               PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
1353         if (ret)
1354                 dev_err(priv->port.dev,
1355                         "pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);
1356
1357         pch_free_dma(port);
1358
1359         free_irq(priv->port.irq, priv);
1360 }
1361
1362 /* Change the port parameters, including word length, parity, stop
1363  *bits.  Update read_status_mask and ignore_status_mask to indicate
1364  *the types of events we are interested in receiving.  */
1365 static void pch_uart_set_termios(struct uart_port *port,
1366                                  struct ktermios *termios, struct ktermios *old)
1367 {
1368         int baud;
1369         int rtn;
1370         unsigned int parity, bits, stb;
1371         struct eg20t_port *priv;
1372         unsigned long flags;
1373
1374         priv = container_of(port, struct eg20t_port, port);
1375         switch (termios->c_cflag & CSIZE) {
1376         case CS5:
1377                 bits = PCH_UART_HAL_5BIT;
1378                 break;
1379         case CS6:
1380                 bits = PCH_UART_HAL_6BIT;
1381                 break;
1382         case CS7:
1383                 bits = PCH_UART_HAL_7BIT;
1384                 break;
1385         default:                /* CS8 */
1386                 bits = PCH_UART_HAL_8BIT;
1387                 break;
1388         }
1389         if (termios->c_cflag & CSTOPB)
1390                 stb = PCH_UART_HAL_STB2;
1391         else
1392                 stb = PCH_UART_HAL_STB1;
1393
1394         if (termios->c_cflag & PARENB) {
1395                 if (termios->c_cflag & PARODD)
1396                         parity = PCH_UART_HAL_PARITY_ODD;
1397                 else
1398                         parity = PCH_UART_HAL_PARITY_EVEN;
1399
1400         } else
1401                 parity = PCH_UART_HAL_PARITY_NONE;
1402
1403         /* Only UART0 has auto hardware flow function */
1404         if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256))
1405                 priv->mcr |= UART_MCR_AFE;
1406         else
1407                 priv->mcr &= ~UART_MCR_AFE;
1408
1409         termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
1410
1411         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
1412
1413         spin_lock_irqsave(&priv->lock, flags);
1414         spin_lock(&port->lock);
1415
1416         uart_update_timeout(port, termios->c_cflag, baud);
1417         rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
1418         if (rtn)
1419                 goto out;
1420
1421         pch_uart_set_mctrl(&priv->port, priv->port.mctrl);
1422         /* Don't rewrite B0 */
1423         if (tty_termios_baud_rate(termios))
1424                 tty_termios_encode_baud_rate(termios, baud, baud);
1425
1426 out:
1427         spin_unlock(&port->lock);
1428         spin_unlock_irqrestore(&priv->lock, flags);
1429 }
1430
1431 static const char *pch_uart_type(struct uart_port *port)
1432 {
1433         return KBUILD_MODNAME;
1434 }
1435
1436 static void pch_uart_release_port(struct uart_port *port)
1437 {
1438         struct eg20t_port *priv;
1439
1440         priv = container_of(port, struct eg20t_port, port);
1441         pci_iounmap(priv->pdev, priv->membase);
1442         pci_release_regions(priv->pdev);
1443 }
1444
1445 static int pch_uart_request_port(struct uart_port *port)
1446 {
1447         struct eg20t_port *priv;
1448         int ret;
1449         void __iomem *membase;
1450
1451         priv = container_of(port, struct eg20t_port, port);
1452         ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
1453         if (ret < 0)
1454                 return -EBUSY;
1455
1456         membase = pci_iomap(priv->pdev, 1, 0);
1457         if (!membase) {
1458                 pci_release_regions(priv->pdev);
1459                 return -EBUSY;
1460         }
1461         priv->membase = port->membase = membase;
1462
1463         return 0;
1464 }
1465
1466 static void pch_uart_config_port(struct uart_port *port, int type)
1467 {
1468         struct eg20t_port *priv;
1469
1470         priv = container_of(port, struct eg20t_port, port);
1471         if (type & UART_CONFIG_TYPE) {
1472                 port->type = priv->port_type;
1473                 pch_uart_request_port(port);
1474         }
1475 }
1476
1477 static int pch_uart_verify_port(struct uart_port *port,
1478                                 struct serial_struct *serinfo)
1479 {
1480         struct eg20t_port *priv;
1481
1482         priv = container_of(port, struct eg20t_port, port);
1483         if (serinfo->flags & UPF_LOW_LATENCY) {
1484                 dev_info(priv->port.dev,
1485                         "PCH UART : Use PIO Mode (without DMA)\n");
1486                 priv->use_dma = 0;
1487                 serinfo->flags &= ~UPF_LOW_LATENCY;
1488         } else {
1489 #ifndef CONFIG_PCH_DMA
1490                 dev_err(priv->port.dev, "%s : PCH DMA is not Loaded.\n",
1491                         __func__);
1492                 return -EOPNOTSUPP;
1493 #endif
1494                 dev_info(priv->port.dev, "PCH UART : Use DMA Mode\n");
1495                 if (!priv->use_dma)
1496                         pch_request_dma(port);
1497                 priv->use_dma = 1;
1498         }
1499
1500         return 0;
1501 }
1502
1503 /*
1504  *      Wait for transmitter & holding register to empty
1505  */
1506 static void wait_for_xmitr(struct eg20t_port *up, int bits)
1507 {
1508         unsigned int status, tmout = 10000;
1509
1510         /* Wait up to 10ms for the character(s) to be sent. */
1511         for (;;) {
1512                 status = ioread8(up->membase + UART_LSR);
1513
1514                 if ((status & bits) == bits)
1515                         break;
1516                 if (--tmout == 0)
1517                         break;
1518                 udelay(1);
1519         }
1520
1521         /* Wait up to 1s for flow control if necessary */
1522         if (up->port.flags & UPF_CONS_FLOW) {
1523                 unsigned int tmout;
1524                 for (tmout = 1000000; tmout; tmout--) {
1525                         unsigned int msr = ioread8(up->membase + UART_MSR);
1526                         if (msr & UART_MSR_CTS)
1527                                 break;
1528                         udelay(1);
1529                         touch_nmi_watchdog();
1530                 }
1531         }
1532 }
1533
1534 #ifdef CONFIG_CONSOLE_POLL
1535 /*
1536  * Console polling routines for communicate via uart while
1537  * in an interrupt or debug context.
1538  */
1539 static int pch_uart_get_poll_char(struct uart_port *port)
1540 {
1541         struct eg20t_port *priv =
1542                 container_of(port, struct eg20t_port, port);
1543         u8 lsr = ioread8(priv->membase + UART_LSR);
1544
1545         if (!(lsr & UART_LSR_DR))
1546                 return NO_POLL_CHAR;
1547
1548         return ioread8(priv->membase + PCH_UART_RBR);
1549 }
1550
1551
1552 static void pch_uart_put_poll_char(struct uart_port *port,
1553                          unsigned char c)
1554 {
1555         unsigned int ier;
1556         struct eg20t_port *priv =
1557                 container_of(port, struct eg20t_port, port);
1558
1559         /*
1560          * First save the IER then disable the interrupts
1561          */
1562         ier = ioread8(priv->membase + UART_IER);
1563         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1564
1565         wait_for_xmitr(priv, UART_LSR_THRE);
1566         /*
1567          * Send the character out.
1568          * If a LF, also do CR...
1569          */
1570         iowrite8(c, priv->membase + PCH_UART_THR);
1571         if (c == 10) {
1572                 wait_for_xmitr(priv, UART_LSR_THRE);
1573                 iowrite8(13, priv->membase + PCH_UART_THR);
1574         }
1575
1576         /*
1577          * Finally, wait for transmitter to become empty
1578          * and restore the IER
1579          */
1580         wait_for_xmitr(priv, BOTH_EMPTY);
1581         iowrite8(ier, priv->membase + UART_IER);
1582 }
1583 #endif /* CONFIG_CONSOLE_POLL */
1584
1585 static struct uart_ops pch_uart_ops = {
1586         .tx_empty = pch_uart_tx_empty,
1587         .set_mctrl = pch_uart_set_mctrl,
1588         .get_mctrl = pch_uart_get_mctrl,
1589         .stop_tx = pch_uart_stop_tx,
1590         .start_tx = pch_uart_start_tx,
1591         .stop_rx = pch_uart_stop_rx,
1592         .enable_ms = pch_uart_enable_ms,
1593         .break_ctl = pch_uart_break_ctl,
1594         .startup = pch_uart_startup,
1595         .shutdown = pch_uart_shutdown,
1596         .set_termios = pch_uart_set_termios,
1597 /*      .pm             = pch_uart_pm,          Not supported yet */
1598 /*      .set_wake       = pch_uart_set_wake,    Not supported yet */
1599         .type = pch_uart_type,
1600         .release_port = pch_uart_release_port,
1601         .request_port = pch_uart_request_port,
1602         .config_port = pch_uart_config_port,
1603         .verify_port = pch_uart_verify_port,
1604 #ifdef CONFIG_CONSOLE_POLL
1605         .poll_get_char = pch_uart_get_poll_char,
1606         .poll_put_char = pch_uart_put_poll_char,
1607 #endif
1608 };
1609
1610 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1611
1612 static void pch_console_putchar(struct uart_port *port, int ch)
1613 {
1614         struct eg20t_port *priv =
1615                 container_of(port, struct eg20t_port, port);
1616
1617         wait_for_xmitr(priv, UART_LSR_THRE);
1618         iowrite8(ch, priv->membase + PCH_UART_THR);
1619 }
1620
1621 /*
1622  *      Print a string to the serial port trying not to disturb
1623  *      any possible real use of the port...
1624  *
1625  *      The console_lock must be held when we get here.
1626  */
1627 static void
1628 pch_console_write(struct console *co, const char *s, unsigned int count)
1629 {
1630         struct eg20t_port *priv;
1631         unsigned long flags;
1632         int priv_locked = 1;
1633         int port_locked = 1;
1634         u8 ier;
1635
1636         priv = pch_uart_ports[co->index];
1637
1638         touch_nmi_watchdog();
1639
1640         local_irq_save(flags);
1641         if (priv->port.sysrq) {
1642                 /* call to uart_handle_sysrq_char already took the priv lock */
1643                 priv_locked = 0;
1644                 /* serial8250_handle_port() already took the port lock */
1645                 port_locked = 0;
1646         } else if (oops_in_progress) {
1647                 priv_locked = spin_trylock(&priv->lock);
1648                 port_locked = spin_trylock(&priv->port.lock);
1649         } else {
1650                 spin_lock(&priv->lock);
1651                 spin_lock(&priv->port.lock);
1652         }
1653
1654         /*
1655          *      First save the IER then disable the interrupts
1656          */
1657         ier = ioread8(priv->membase + UART_IER);
1658
1659         pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1660
1661         uart_console_write(&priv->port, s, count, pch_console_putchar);
1662
1663         /*
1664          *      Finally, wait for transmitter to become empty
1665          *      and restore the IER
1666          */
1667         wait_for_xmitr(priv, BOTH_EMPTY);
1668         iowrite8(ier, priv->membase + UART_IER);
1669
1670         if (port_locked)
1671                 spin_unlock(&priv->port.lock);
1672         if (priv_locked)
1673                 spin_unlock(&priv->lock);
1674         local_irq_restore(flags);
1675 }
1676
1677 static int __init pch_console_setup(struct console *co, char *options)
1678 {
1679         struct uart_port *port;
1680         int baud = default_baud;
1681         int bits = 8;
1682         int parity = 'n';
1683         int flow = 'n';
1684
1685         /*
1686          * Check whether an invalid uart number has been specified, and
1687          * if so, search for the first available port that does have
1688          * console support.
1689          */
1690         if (co->index >= PCH_UART_NR)
1691                 co->index = 0;
1692         port = &pch_uart_ports[co->index]->port;
1693
1694         if (!port || (!port->iobase && !port->membase))
1695                 return -ENODEV;
1696
1697         port->uartclk = pch_uart_get_uartclk();
1698
1699         if (options)
1700                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1701
1702         return uart_set_options(port, co, baud, parity, bits, flow);
1703 }
1704
1705 static struct uart_driver pch_uart_driver;
1706
1707 static struct console pch_console = {
1708         .name           = PCH_UART_DRIVER_DEVICE,
1709         .write          = pch_console_write,
1710         .device         = uart_console_device,
1711         .setup          = pch_console_setup,
1712         .flags          = CON_PRINTBUFFER | CON_ANYTIME,
1713         .index          = -1,
1714         .data           = &pch_uart_driver,
1715 };
1716
1717 #define PCH_CONSOLE     (&pch_console)
1718 #else
1719 #define PCH_CONSOLE     NULL
1720 #endif  /* CONFIG_SERIAL_PCH_UART_CONSOLE */
1721
1722 static struct uart_driver pch_uart_driver = {
1723         .owner = THIS_MODULE,
1724         .driver_name = KBUILD_MODNAME,
1725         .dev_name = PCH_UART_DRIVER_DEVICE,
1726         .major = 0,
1727         .minor = 0,
1728         .nr = PCH_UART_NR,
1729         .cons = PCH_CONSOLE,
1730 };
1731
1732 static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
1733                                              const struct pci_device_id *id)
1734 {
1735         struct eg20t_port *priv;
1736         int ret;
1737         unsigned int iobase;
1738         unsigned int mapbase;
1739         unsigned char *rxbuf;
1740         int fifosize;
1741         int port_type;
1742         struct pch_uart_driver_data *board;
1743         char name[32];  /* for debugfs file name */
1744
1745         board = &drv_dat[id->driver_data];
1746         port_type = board->port_type;
1747
1748         priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
1749         if (priv == NULL)
1750                 goto init_port_alloc_err;
1751
1752         rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1753         if (!rxbuf)
1754                 goto init_port_free_txbuf;
1755
1756         switch (port_type) {
1757         case PORT_UNKNOWN:
1758                 fifosize = 256; /* EG20T/ML7213: UART0 */
1759                 break;
1760         case PORT_8250:
1761                 fifosize = 64; /* EG20T:UART1~3  ML7213: UART1~2*/
1762                 break;
1763         default:
1764                 dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
1765                 goto init_port_hal_free;
1766         }
1767
1768         pci_enable_msi(pdev);
1769         pci_set_master(pdev);
1770
1771         spin_lock_init(&priv->lock);
1772
1773         iobase = pci_resource_start(pdev, 0);
1774         mapbase = pci_resource_start(pdev, 1);
1775         priv->mapbase = mapbase;
1776         priv->iobase = iobase;
1777         priv->pdev = pdev;
1778         priv->tx_empty = 1;
1779         priv->rxbuf.buf = rxbuf;
1780         priv->rxbuf.size = PAGE_SIZE;
1781
1782         priv->fifo_size = fifosize;
1783         priv->uartclk = pch_uart_get_uartclk();
1784         priv->port_type = PORT_MAX_8250 + port_type + 1;
1785         priv->port.dev = &pdev->dev;
1786         priv->port.iobase = iobase;
1787         priv->port.membase = NULL;
1788         priv->port.mapbase = mapbase;
1789         priv->port.irq = pdev->irq;
1790         priv->port.iotype = UPIO_PORT;
1791         priv->port.ops = &pch_uart_ops;
1792         priv->port.flags = UPF_BOOT_AUTOCONF;
1793         priv->port.fifosize = fifosize;
1794         priv->port.line = board->line_no;
1795         priv->trigger = PCH_UART_HAL_TRIGGER_M;
1796
1797         spin_lock_init(&priv->port.lock);
1798
1799         pci_set_drvdata(pdev, priv);
1800         priv->trigger_level = 1;
1801         priv->fcr = 0;
1802
1803 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1804         pch_uart_ports[board->line_no] = priv;
1805 #endif
1806         ret = uart_add_one_port(&pch_uart_driver, &priv->port);
1807         if (ret < 0)
1808                 goto init_port_hal_free;
1809
1810 #ifdef CONFIG_DEBUG_FS
1811         snprintf(name, sizeof(name), "uart%d_regs", board->line_no);
1812         priv->debugfs = debugfs_create_file(name, S_IFREG | S_IRUGO,
1813                                 NULL, priv, &port_regs_ops);
1814 #endif
1815
1816         return priv;
1817
1818 init_port_hal_free:
1819 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1820         pch_uart_ports[board->line_no] = NULL;
1821 #endif
1822         free_page((unsigned long)rxbuf);
1823 init_port_free_txbuf:
1824         kfree(priv);
1825 init_port_alloc_err:
1826
1827         return NULL;
1828 }
1829
1830 static void pch_uart_exit_port(struct eg20t_port *priv)
1831 {
1832
1833 #ifdef CONFIG_DEBUG_FS
1834         if (priv->debugfs)
1835                 debugfs_remove(priv->debugfs);
1836 #endif
1837         uart_remove_one_port(&pch_uart_driver, &priv->port);
1838         pci_set_drvdata(priv->pdev, NULL);
1839         free_page((unsigned long)priv->rxbuf.buf);
1840 }
1841
1842 static void pch_uart_pci_remove(struct pci_dev *pdev)
1843 {
1844         struct eg20t_port *priv = pci_get_drvdata(pdev);
1845
1846         pci_disable_msi(pdev);
1847
1848 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1849         pch_uart_ports[priv->port.line] = NULL;
1850 #endif
1851         pch_uart_exit_port(priv);
1852         pci_disable_device(pdev);
1853         kfree(priv);
1854         return;
1855 }
1856 #ifdef CONFIG_PM
1857 static int pch_uart_pci_suspend(struct pci_dev *pdev, pm_message_t state)
1858 {
1859         struct eg20t_port *priv = pci_get_drvdata(pdev);
1860
1861         uart_suspend_port(&pch_uart_driver, &priv->port);
1862
1863         pci_save_state(pdev);
1864         pci_set_power_state(pdev, pci_choose_state(pdev, state));
1865         return 0;
1866 }
1867
1868 static int pch_uart_pci_resume(struct pci_dev *pdev)
1869 {
1870         struct eg20t_port *priv = pci_get_drvdata(pdev);
1871         int ret;
1872
1873         pci_set_power_state(pdev, PCI_D0);
1874         pci_restore_state(pdev);
1875
1876         ret = pci_enable_device(pdev);
1877         if (ret) {
1878                 dev_err(&pdev->dev,
1879                 "%s-pci_enable_device failed(ret=%d) ", __func__, ret);
1880                 return ret;
1881         }
1882
1883         uart_resume_port(&pch_uart_driver, &priv->port);
1884
1885         return 0;
1886 }
1887 #else
1888 #define pch_uart_pci_suspend NULL
1889 #define pch_uart_pci_resume NULL
1890 #endif
1891
1892 static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
1893         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
1894          .driver_data = pch_et20t_uart0},
1895         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
1896          .driver_data = pch_et20t_uart1},
1897         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
1898          .driver_data = pch_et20t_uart2},
1899         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
1900          .driver_data = pch_et20t_uart3},
1901         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
1902          .driver_data = pch_ml7213_uart0},
1903         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
1904          .driver_data = pch_ml7213_uart1},
1905         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
1906          .driver_data = pch_ml7213_uart2},
1907         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C),
1908          .driver_data = pch_ml7223_uart0},
1909         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D),
1910          .driver_data = pch_ml7223_uart1},
1911         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8811),
1912          .driver_data = pch_ml7831_uart0},
1913         {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8812),
1914          .driver_data = pch_ml7831_uart1},
1915         {0,},
1916 };
1917
1918 static int pch_uart_pci_probe(struct pci_dev *pdev,
1919                                         const struct pci_device_id *id)
1920 {
1921         int ret;
1922         struct eg20t_port *priv;
1923
1924         ret = pci_enable_device(pdev);
1925         if (ret < 0)
1926                 goto probe_error;
1927
1928         priv = pch_uart_init_port(pdev, id);
1929         if (!priv) {
1930                 ret = -EBUSY;
1931                 goto probe_disable_device;
1932         }
1933         pci_set_drvdata(pdev, priv);
1934
1935         return ret;
1936
1937 probe_disable_device:
1938         pci_disable_msi(pdev);
1939         pci_disable_device(pdev);
1940 probe_error:
1941         return ret;
1942 }
1943
1944 static struct pci_driver pch_uart_pci_driver = {
1945         .name = "pch_uart",
1946         .id_table = pch_uart_pci_id,
1947         .probe = pch_uart_pci_probe,
1948         .remove = pch_uart_pci_remove,
1949         .suspend = pch_uart_pci_suspend,
1950         .resume = pch_uart_pci_resume,
1951 };
1952
1953 static int __init pch_uart_module_init(void)
1954 {
1955         int ret;
1956
1957         /* register as UART driver */
1958         ret = uart_register_driver(&pch_uart_driver);
1959         if (ret < 0)
1960                 return ret;
1961
1962         /* register as PCI driver */
1963         ret = pci_register_driver(&pch_uart_pci_driver);
1964         if (ret < 0)
1965                 uart_unregister_driver(&pch_uart_driver);
1966
1967         return ret;
1968 }
1969 module_init(pch_uart_module_init);
1970
1971 static void __exit pch_uart_module_exit(void)
1972 {
1973         pci_unregister_driver(&pch_uart_pci_driver);
1974         uart_unregister_driver(&pch_uart_driver);
1975 }
1976 module_exit(pch_uart_module_exit);
1977
1978 MODULE_LICENSE("GPL v2");
1979 MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
1980 module_param(default_baud, uint, S_IRUGO);
1981 MODULE_PARM_DESC(default_baud,
1982                  "Default BAUD for initial driver state and console (default 9600)");
1983 module_param(user_uartclk, uint, S_IRUGO);
1984 MODULE_PARM_DESC(user_uartclk,
1985                  "Override UART default or board specific UART clock");