drivers/tty/serial/pch_uart.c

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