2 *Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
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.
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.
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.
17 #if defined(CONFIG_SERIAL_PCH_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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>
31 #include <linux/dmi.h>
32 #include <linux/nmi.h>
33 #include <linux/delay.h>
35 #include <linux/debugfs.h>
36 #include <linux/dmaengine.h>
37 #include <linux/pch_dma.h>
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,
53 #define PCH_UART_DRIVER_DEVICE "ttyPCH"
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
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))
70 #define PCH_UART_HANDLED_LS_INT (1<<((PCH_UART_HANDLED_LS_INT_SHIFT)<<1))
72 #define PCH_UART_RBR 0x00
73 #define PCH_UART_THR 0x00
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
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
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
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
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 |\
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
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
137 #define PCH_UART_LSR_DR 0x00000001
138 #define PCH_UART_LSR_ERR (1<<7)
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)
151 #define PCH_UART_DLL 0x00
152 #define PCH_UART_DLM 0x01
154 #define PCH_UART_BRCSR 0x0E
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)
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)
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)
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)
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)
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)
211 #define PCI_VENDOR_ID_ROHM 0x10DB
213 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
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 */
222 struct pch_uart_buffer {
228 struct uart_port port;
230 void __iomem *membase;
231 resource_size_t mapbase;
233 struct pci_dev *pdev;
241 struct pch_uart_buffer rxbuf;
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;
254 struct scatterlist sg_rx;
257 dma_addr_t rx_buf_dma;
259 struct dentry *debugfs;
261 /* protect the eg20t_port private structure and io access to membase */
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...)
270 struct pch_uart_driver_data {
275 enum pch_uart_num_t {
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},
303 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
304 static struct eg20t_port *pch_uart_ports[PCH_UART_NR];
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 };
313 #ifdef CONFIG_DEBUG_FS
315 #define PCH_REGS_BUFSIZE 1024
318 static ssize_t port_show_regs(struct file *file, char __user *user_buf,
319 size_t count, loff_t *ppos)
321 struct eg20t_port *priv = file->private_data;
327 buf = kzalloc(PCH_REGS_BUFSIZE, GFP_KERNEL);
331 len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
332 "PCH EG20T port[%d] regs:\n", priv->port.line);
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,
350 ioread8(priv->membase + PCH_UART_BRCSR));
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);
360 if (len > PCH_REGS_BUFSIZE)
361 len = PCH_REGS_BUFSIZE;
363 ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
368 static const struct file_operations port_regs_ops = {
369 .owner = THIS_MODULE,
371 .read = port_show_regs,
372 .llseek = default_llseek,
374 #endif /* CONFIG_DEBUG_FS */
376 /* Return UART clock, checking for board specific clocks. */
377 static int pch_uart_get_uartclk(void)
384 cmp = dmi_get_system_info(DMI_BOARD_NAME);
385 if (cmp && strstr(cmp, "CM-iTC"))
386 return CMITC_UARTCLK;
388 cmp = dmi_get_system_info(DMI_BIOS_VERSION);
389 if (cmp && strnstr(cmp, "FRI2", 4))
390 return FRI2_64_UARTCLK;
392 cmp = dmi_get_system_info(DMI_PRODUCT_NAME);
393 if (cmp && strstr(cmp, "Fish River Island II"))
394 return FRI2_48_UARTCLK;
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")))
402 cmp = dmi_get_system_info(DMI_BOARD_NAME);
403 if (cmp && strstr(cmp, "MinnowBoard"))
404 return MINNOW_UARTCLK;
406 return DEFAULT_UARTCLK;
409 static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv,
412 u8 ier = ioread8(priv->membase + UART_IER);
413 ier |= flag & PCH_UART_IER_MASK;
414 iowrite8(ier, priv->membase + UART_IER);
417 static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
420 u8 ier = ioread8(priv->membase + UART_IER);
421 ier &= ~(flag & PCH_UART_IER_MASK);
422 iowrite8(ier, priv->membase + UART_IER);
425 static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud,
426 unsigned int parity, unsigned int bits,
429 unsigned int dll, dlm, lcr;
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);
438 dll = (unsigned int)div & 0x00FFU;
439 dlm = ((unsigned int)div >> 8) & 0x00FFU;
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);
446 if (bits & ~PCH_UART_LCR_WLS) {
447 dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits);
451 if (stb & ~PCH_UART_LCR_STB) {
452 dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb);
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);
470 static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
473 if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) {
474 dev_err(priv->port.dev, "%s:Invalid flag(0x%x)\n",
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);
487 static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
488 unsigned int dmamode,
489 unsigned int fifo_size, unsigned int trigger)
493 if (dmamode & ~PCH_UART_FCR_DMS) {
494 dev_err(priv->port.dev, "%s:Invalid DMA Mode(0x%x)\n",
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);
505 if (trigger & ~PCH_UART_FCR_RFTL) {
506 dev_err(priv->port.dev, "%s:Invalid TRIGGER(0x%x)\n",
511 switch (priv->fifo_size) {
513 priv->trigger_level =
514 trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT];
517 priv->trigger_level =
518 trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT];
521 priv->trigger_level =
522 trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT];
525 priv->trigger_level =
526 trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT];
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);
540 static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
542 unsigned int msr = ioread8(priv->membase + UART_MSR);
543 priv->dmsr = msr & PCH_UART_MSR_DELTA;
547 static void pch_uart_hal_write(struct eg20t_port *priv,
548 const unsigned char *buf, int tx_size)
553 for (i = 0; i < tx_size;) {
555 iowrite8(thr, priv->membase + PCH_UART_THR);
559 static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
564 struct uart_port *port = &priv->port;
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);
572 if (lsr & UART_LSR_BI) {
574 if (uart_handle_break(port))
579 if (uart_handle_sysrq_char(port, rbr))
589 static unsigned char pch_uart_hal_get_iid(struct eg20t_port *priv)
591 return ioread8(priv->membase + UART_IIR) &\
592 (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP);
595 static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
597 return ioread8(priv->membase + UART_LSR);
600 static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
604 lcr = ioread8(priv->membase + UART_LCR);
606 lcr |= PCH_UART_LCR_SB;
608 lcr &= ~PCH_UART_LCR_SB;
610 iowrite8(lcr, priv->membase + UART_LCR);
613 static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
616 struct uart_port *port = &priv->port;
617 struct tty_port *tport = &port->state->port;
619 tty_insert_flip_string(tport, buf, size);
620 tty_flip_buffer_push(tport);
625 static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf)
628 struct uart_port *port = &priv->port;
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;
641 static int dma_push_rx(struct eg20t_port *priv, int size)
643 struct tty_struct *tty;
645 struct uart_port *port = &priv->port;
646 struct tty_port *tport = &port->state->port;
649 tty = tty_port_tty_get(tport);
651 dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
655 room = tty_buffer_request_room(tport, size);
658 dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
663 tty_insert_flip_string(tport, sg_virt(&priv->sg_rx), size);
665 port->icount.rx += room;
672 static void pch_free_dma(struct uart_port *port)
674 struct eg20t_port *priv;
675 priv = container_of(port, struct eg20t_port, port);
678 dma_release_channel(priv->chan_tx);
679 priv->chan_tx = NULL;
682 dma_release_channel(priv->chan_rx);
683 priv->chan_rx = NULL;
686 if (priv->rx_buf_dma) {
687 dma_free_coherent(port->dev, port->fifosize, priv->rx_buf_virt,
689 priv->rx_buf_virt = NULL;
690 priv->rx_buf_dma = 0;
696 static bool filter(struct dma_chan *chan, void *slave)
698 struct pch_dma_slave *param = slave;
700 if ((chan->chan_id == param->chan_id) && (param->dma_dev ==
701 chan->device->dev)) {
702 chan->private = param;
709 static void pch_request_dma(struct uart_port *port)
712 struct dma_chan *chan;
713 struct pci_dev *dma_dev;
714 struct pch_dma_slave *param;
715 struct eg20t_port *priv =
716 container_of(port, struct eg20t_port, port);
718 dma_cap_set(DMA_SLAVE, mask);
720 dma_dev = pci_get_bus_and_slot(priv->pdev->bus->number,
721 PCI_DEVFN(0xa, 0)); /* Get DMA's dev
724 param = &priv->param_tx;
725 param->dma_dev = &dma_dev->dev;
726 param->chan_id = priv->port.line * 2; /* Tx = 0, 2, 4, ... */
728 param->tx_reg = port->mapbase + UART_TX;
729 chan = dma_request_channel(mask, filter, param);
731 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
735 priv->chan_tx = chan;
738 param = &priv->param_rx;
739 param->dma_dev = &dma_dev->dev;
740 param->chan_id = priv->port.line * 2 + 1; /* Rx = Tx + 1 */
742 param->rx_reg = port->mapbase + UART_RX;
743 chan = dma_request_channel(mask, filter, param);
745 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Rx)\n",
747 dma_release_channel(priv->chan_tx);
748 priv->chan_tx = NULL;
752 /* Get Consistent memory for DMA */
753 priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
754 &priv->rx_buf_dma, GFP_KERNEL);
755 priv->chan_rx = chan;
758 static void pch_dma_rx_complete(void *arg)
760 struct eg20t_port *priv = arg;
761 struct uart_port *port = &priv->port;
764 dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
765 count = dma_push_rx(priv, priv->trigger_level);
767 tty_flip_buffer_push(&port->state->port);
768 async_tx_ack(priv->desc_rx);
769 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
770 PCH_UART_HAL_RX_ERR_INT);
773 static void pch_dma_tx_complete(void *arg)
775 struct eg20t_port *priv = arg;
776 struct uart_port *port = &priv->port;
777 struct circ_buf *xmit = &port->state->xmit;
778 struct scatterlist *sg = priv->sg_tx_p;
781 for (i = 0; i < priv->nent; i++, sg++) {
782 xmit->tail += sg_dma_len(sg);
783 port->icount.tx += sg_dma_len(sg);
785 xmit->tail &= UART_XMIT_SIZE - 1;
786 async_tx_ack(priv->desc_tx);
787 dma_unmap_sg(port->dev, sg, priv->nent, DMA_TO_DEVICE);
788 priv->tx_dma_use = 0;
790 kfree(priv->sg_tx_p);
791 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
794 static int pop_tx(struct eg20t_port *priv, int size)
797 struct uart_port *port = &priv->port;
798 struct circ_buf *xmit = &port->state->xmit;
800 if (uart_tx_stopped(port) || uart_circ_empty(xmit) || count >= size)
805 CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
806 int sz = min(size - count, cnt_to_end);
807 pch_uart_hal_write(priv, &xmit->buf[xmit->tail], sz);
808 xmit->tail = (xmit->tail + sz) & (UART_XMIT_SIZE - 1);
810 } while (!uart_circ_empty(xmit) && count < size);
813 dev_dbg(priv->port.dev, "%d characters. Remained %d characters.(%lu)\n",
814 count, size - count, jiffies);
819 static int handle_rx_to(struct eg20t_port *priv)
821 struct pch_uart_buffer *buf;
824 if (!priv->start_rx) {
825 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
826 PCH_UART_HAL_RX_ERR_INT);
831 rx_size = pch_uart_hal_read(priv, buf->buf, buf->size);
832 ret = push_rx(priv, buf->buf, rx_size);
835 } while (rx_size == buf->size);
837 return PCH_UART_HANDLED_RX_INT;
840 static int handle_rx(struct eg20t_port *priv)
842 return handle_rx_to(priv);
845 static int dma_handle_rx(struct eg20t_port *priv)
847 struct uart_port *port = &priv->port;
848 struct dma_async_tx_descriptor *desc;
849 struct scatterlist *sg;
851 priv = container_of(port, struct eg20t_port, port);
854 sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */
856 sg_dma_len(sg) = priv->trigger_level;
858 sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt),
859 sg_dma_len(sg), (unsigned long)priv->rx_buf_virt &
862 sg_dma_address(sg) = priv->rx_buf_dma;
864 desc = dmaengine_prep_slave_sg(priv->chan_rx,
865 sg, 1, DMA_DEV_TO_MEM,
866 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
871 priv->desc_rx = desc;
872 desc->callback = pch_dma_rx_complete;
873 desc->callback_param = priv;
874 desc->tx_submit(desc);
875 dma_async_issue_pending(priv->chan_rx);
877 return PCH_UART_HANDLED_RX_INT;
880 static unsigned int handle_tx(struct eg20t_port *priv)
882 struct uart_port *port = &priv->port;
883 struct circ_buf *xmit = &port->state->xmit;
889 if (!priv->start_tx) {
890 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
892 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
897 fifo_size = max(priv->fifo_size, 1);
899 if (pop_tx_x(priv, xmit->buf)) {
900 pch_uart_hal_write(priv, xmit->buf, 1);
905 size = min(xmit->head - xmit->tail, fifo_size);
909 tx_size = pop_tx(priv, size);
911 port->icount.tx += tx_size;
915 priv->tx_empty = tx_empty;
918 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
919 uart_write_wakeup(port);
922 return PCH_UART_HANDLED_TX_INT;
925 static unsigned int dma_handle_tx(struct eg20t_port *priv)
927 struct uart_port *port = &priv->port;
928 struct circ_buf *xmit = &port->state->xmit;
929 struct scatterlist *sg;
933 struct dma_async_tx_descriptor *desc;
940 if (!priv->start_tx) {
941 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
943 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
948 if (priv->tx_dma_use) {
949 dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n",
951 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
956 fifo_size = max(priv->fifo_size, 1);
958 if (pop_tx_x(priv, xmit->buf)) {
959 pch_uart_hal_write(priv, xmit->buf, 1);
965 bytes = min((int)CIRC_CNT(xmit->head, xmit->tail,
966 UART_XMIT_SIZE), CIRC_CNT_TO_END(xmit->head,
967 xmit->tail, UART_XMIT_SIZE));
969 dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__);
970 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
971 uart_write_wakeup(port);
975 if (bytes > fifo_size) {
976 num = bytes / fifo_size + 1;
978 rem = bytes % fifo_size;
985 dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n",
986 __func__, num, size, rem);
988 priv->tx_dma_use = 1;
990 priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
991 if (!priv->sg_tx_p) {
992 dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__);
996 sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
999 for (i = 0; i < num; i++, sg++) {
1001 sg_set_page(sg, virt_to_page(xmit->buf),
1002 rem, fifo_size * i);
1004 sg_set_page(sg, virt_to_page(xmit->buf),
1005 size, fifo_size * i);
1009 nent = dma_map_sg(port->dev, sg, num, DMA_TO_DEVICE);
1011 dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__);
1016 for (i = 0; i < nent; i++, sg++) {
1017 sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) +
1019 sg_dma_address(sg) = (sg_dma_address(sg) &
1020 ~(UART_XMIT_SIZE - 1)) + sg->offset;
1021 if (i == (nent - 1))
1022 sg_dma_len(sg) = rem;
1024 sg_dma_len(sg) = size;
1027 desc = dmaengine_prep_slave_sg(priv->chan_tx,
1028 priv->sg_tx_p, nent, DMA_MEM_TO_DEV,
1029 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1031 dev_err(priv->port.dev, "%s:device_prep_slave_sg Failed\n",
1035 dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE);
1036 priv->desc_tx = desc;
1037 desc->callback = pch_dma_tx_complete;
1038 desc->callback_param = priv;
1040 desc->tx_submit(desc);
1042 dma_async_issue_pending(priv->chan_tx);
1044 return PCH_UART_HANDLED_TX_INT;
1047 static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
1049 struct uart_port *port = &priv->port;
1050 struct tty_struct *tty = tty_port_tty_get(&port->state->port);
1051 char *error_msg[5] = {};
1054 if (lsr & PCH_UART_LSR_ERR)
1055 error_msg[i++] = "Error data in FIFO\n";
1057 if (lsr & UART_LSR_FE) {
1058 port->icount.frame++;
1059 error_msg[i++] = " Framing Error\n";
1062 if (lsr & UART_LSR_PE) {
1063 port->icount.parity++;
1064 error_msg[i++] = " Parity Error\n";
1067 if (lsr & UART_LSR_OE) {
1068 port->icount.overrun++;
1069 error_msg[i++] = " Overrun Error\n";
1073 for (i = 0; error_msg[i] != NULL; i++)
1074 dev_err(&priv->pdev->dev, error_msg[i]);
1080 static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
1082 struct eg20t_port *priv = dev_id;
1083 unsigned int handled;
1087 unsigned long flags;
1091 spin_lock_irqsave(&priv->lock, flags);
1094 iid = pch_uart_hal_get_iid(priv);
1095 if (iid & PCH_UART_IIR_IP) /* No Interrupt */
1098 case PCH_UART_IID_RLS: /* Receiver Line Status */
1099 lsr = pch_uart_hal_get_line_status(priv);
1100 if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
1101 UART_LSR_PE | UART_LSR_OE)) {
1102 pch_uart_err_ir(priv, lsr);
1103 ret = PCH_UART_HANDLED_RX_ERR_INT;
1105 ret = PCH_UART_HANDLED_LS_INT;
1108 case PCH_UART_IID_RDR: /* Received Data Ready */
1109 if (priv->use_dma) {
1110 pch_uart_hal_disable_interrupt(priv,
1111 PCH_UART_HAL_RX_INT |
1112 PCH_UART_HAL_RX_ERR_INT);
1113 ret = dma_handle_rx(priv);
1115 pch_uart_hal_enable_interrupt(priv,
1116 PCH_UART_HAL_RX_INT |
1117 PCH_UART_HAL_RX_ERR_INT);
1119 ret = handle_rx(priv);
1122 case PCH_UART_IID_RDR_TO: /* Received Data Ready
1124 ret = handle_rx_to(priv);
1126 case PCH_UART_IID_THRE: /* Transmitter Holding Register
1129 ret = dma_handle_tx(priv);
1131 ret = handle_tx(priv);
1133 case PCH_UART_IID_MS: /* Modem Status */
1134 msr = pch_uart_hal_get_modem(priv);
1135 next = 0; /* MS ir prioirty is the lowest. So, MS ir
1136 means final interrupt */
1137 if ((msr & UART_MSR_ANY_DELTA) == 0)
1139 ret |= PCH_UART_HANDLED_MS_INT;
1141 default: /* Never junp to this label */
1142 dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__,
1148 handled |= (unsigned int)ret;
1151 spin_unlock_irqrestore(&priv->lock, flags);
1152 return IRQ_RETVAL(handled);
1155 /* This function tests whether the transmitter fifo and shifter for the port
1156 described by 'port' is empty. */
1157 static unsigned int pch_uart_tx_empty(struct uart_port *port)
1159 struct eg20t_port *priv;
1161 priv = container_of(port, struct eg20t_port, port);
1163 return TIOCSER_TEMT;
1168 /* Returns the current state of modem control inputs. */
1169 static unsigned int pch_uart_get_mctrl(struct uart_port *port)
1171 struct eg20t_port *priv;
1173 unsigned int ret = 0;
1175 priv = container_of(port, struct eg20t_port, port);
1176 modem = pch_uart_hal_get_modem(priv);
1178 if (modem & UART_MSR_DCD)
1181 if (modem & UART_MSR_RI)
1184 if (modem & UART_MSR_DSR)
1187 if (modem & UART_MSR_CTS)
1193 static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1196 struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
1198 if (mctrl & TIOCM_DTR)
1199 mcr |= UART_MCR_DTR;
1200 if (mctrl & TIOCM_RTS)
1201 mcr |= UART_MCR_RTS;
1202 if (mctrl & TIOCM_LOOP)
1203 mcr |= UART_MCR_LOOP;
1205 if (priv->mcr & UART_MCR_AFE)
1206 mcr |= UART_MCR_AFE;
1209 iowrite8(mcr, priv->membase + UART_MCR);
1212 static void pch_uart_stop_tx(struct uart_port *port)
1214 struct eg20t_port *priv;
1215 priv = container_of(port, struct eg20t_port, port);
1217 priv->tx_dma_use = 0;
1220 static void pch_uart_start_tx(struct uart_port *port)
1222 struct eg20t_port *priv;
1224 priv = container_of(port, struct eg20t_port, port);
1226 if (priv->use_dma) {
1227 if (priv->tx_dma_use) {
1228 dev_dbg(priv->port.dev, "%s : Tx DMA is NOT empty.\n",
1235 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
1238 static void pch_uart_stop_rx(struct uart_port *port)
1240 struct eg20t_port *priv;
1241 priv = container_of(port, struct eg20t_port, port);
1243 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
1244 PCH_UART_HAL_RX_ERR_INT);
1247 /* Enable the modem status interrupts. */
1248 static void pch_uart_enable_ms(struct uart_port *port)
1250 struct eg20t_port *priv;
1251 priv = container_of(port, struct eg20t_port, port);
1252 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
1255 /* Control the transmission of a break signal. */
1256 static void pch_uart_break_ctl(struct uart_port *port, int ctl)
1258 struct eg20t_port *priv;
1259 unsigned long flags;
1261 priv = container_of(port, struct eg20t_port, port);
1262 spin_lock_irqsave(&priv->lock, flags);
1263 pch_uart_hal_set_break(priv, ctl);
1264 spin_unlock_irqrestore(&priv->lock, flags);
1267 /* Grab any interrupt resources and initialise any low level driver state. */
1268 static int pch_uart_startup(struct uart_port *port)
1270 struct eg20t_port *priv;
1275 priv = container_of(port, struct eg20t_port, port);
1279 priv->uartclk = port->uartclk;
1281 port->uartclk = priv->uartclk;
1283 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1284 ret = pch_uart_hal_set_line(priv, default_baud,
1285 PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
1290 switch (priv->fifo_size) {
1292 fifo_size = PCH_UART_HAL_FIFO256;
1295 fifo_size = PCH_UART_HAL_FIFO64;
1298 fifo_size = PCH_UART_HAL_FIFO16;
1302 fifo_size = PCH_UART_HAL_FIFO_DIS;
1306 switch (priv->trigger) {
1307 case PCH_UART_HAL_TRIGGER1:
1310 case PCH_UART_HAL_TRIGGER_L:
1311 trigger_level = priv->fifo_size / 4;
1313 case PCH_UART_HAL_TRIGGER_M:
1314 trigger_level = priv->fifo_size / 2;
1316 case PCH_UART_HAL_TRIGGER_H:
1318 trigger_level = priv->fifo_size - (priv->fifo_size / 8);
1322 priv->trigger_level = trigger_level;
1323 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1324 fifo_size, priv->trigger);
1328 ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
1329 KBUILD_MODNAME, priv);
1334 pch_request_dma(port);
1337 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
1338 PCH_UART_HAL_RX_ERR_INT);
1339 uart_update_timeout(port, CS8, default_baud);
1344 static void pch_uart_shutdown(struct uart_port *port)
1346 struct eg20t_port *priv;
1349 priv = container_of(port, struct eg20t_port, port);
1350 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1351 pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
1352 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1353 PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
1355 dev_err(priv->port.dev,
1356 "pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);
1360 free_irq(priv->port.irq, priv);
1363 /* Change the port parameters, including word length, parity, stop
1364 *bits. Update read_status_mask and ignore_status_mask to indicate
1365 *the types of events we are interested in receiving. */
1366 static void pch_uart_set_termios(struct uart_port *port,
1367 struct ktermios *termios, struct ktermios *old)
1371 unsigned int parity, bits, stb;
1372 struct eg20t_port *priv;
1373 unsigned long flags;
1375 priv = container_of(port, struct eg20t_port, port);
1376 switch (termios->c_cflag & CSIZE) {
1378 bits = PCH_UART_HAL_5BIT;
1381 bits = PCH_UART_HAL_6BIT;
1384 bits = PCH_UART_HAL_7BIT;
1387 bits = PCH_UART_HAL_8BIT;
1390 if (termios->c_cflag & CSTOPB)
1391 stb = PCH_UART_HAL_STB2;
1393 stb = PCH_UART_HAL_STB1;
1395 if (termios->c_cflag & PARENB) {
1396 if (termios->c_cflag & PARODD)
1397 parity = PCH_UART_HAL_PARITY_ODD;
1399 parity = PCH_UART_HAL_PARITY_EVEN;
1402 parity = PCH_UART_HAL_PARITY_NONE;
1404 /* Only UART0 has auto hardware flow function */
1405 if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256))
1406 priv->mcr |= UART_MCR_AFE;
1408 priv->mcr &= ~UART_MCR_AFE;
1410 termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
1412 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
1414 spin_lock_irqsave(&priv->lock, flags);
1415 spin_lock(&port->lock);
1417 uart_update_timeout(port, termios->c_cflag, baud);
1418 rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
1422 pch_uart_set_mctrl(&priv->port, priv->port.mctrl);
1423 /* Don't rewrite B0 */
1424 if (tty_termios_baud_rate(termios))
1425 tty_termios_encode_baud_rate(termios, baud, baud);
1428 spin_unlock(&port->lock);
1429 spin_unlock_irqrestore(&priv->lock, flags);
1432 static const char *pch_uart_type(struct uart_port *port)
1434 return KBUILD_MODNAME;
1437 static void pch_uart_release_port(struct uart_port *port)
1439 struct eg20t_port *priv;
1441 priv = container_of(port, struct eg20t_port, port);
1442 pci_iounmap(priv->pdev, priv->membase);
1443 pci_release_regions(priv->pdev);
1446 static int pch_uart_request_port(struct uart_port *port)
1448 struct eg20t_port *priv;
1450 void __iomem *membase;
1452 priv = container_of(port, struct eg20t_port, port);
1453 ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
1457 membase = pci_iomap(priv->pdev, 1, 0);
1459 pci_release_regions(priv->pdev);
1462 priv->membase = port->membase = membase;
1467 static void pch_uart_config_port(struct uart_port *port, int type)
1469 struct eg20t_port *priv;
1471 priv = container_of(port, struct eg20t_port, port);
1472 if (type & UART_CONFIG_TYPE) {
1473 port->type = priv->port_type;
1474 pch_uart_request_port(port);
1478 static int pch_uart_verify_port(struct uart_port *port,
1479 struct serial_struct *serinfo)
1481 struct eg20t_port *priv;
1483 priv = container_of(port, struct eg20t_port, port);
1484 if (serinfo->flags & UPF_LOW_LATENCY) {
1485 dev_info(priv->port.dev,
1486 "PCH UART : Use PIO Mode (without DMA)\n");
1488 serinfo->flags &= ~UPF_LOW_LATENCY;
1490 #ifndef CONFIG_PCH_DMA
1491 dev_err(priv->port.dev, "%s : PCH DMA is not Loaded.\n",
1495 dev_info(priv->port.dev, "PCH UART : Use DMA Mode\n");
1497 pch_request_dma(port);
1505 * Wait for transmitter & holding register to empty
1507 static void wait_for_xmitr(struct eg20t_port *up, int bits)
1509 unsigned int status, tmout = 10000;
1511 /* Wait up to 10ms for the character(s) to be sent. */
1513 status = ioread8(up->membase + UART_LSR);
1515 if ((status & bits) == bits)
1522 /* Wait up to 1s for flow control if necessary */
1523 if (up->port.flags & UPF_CONS_FLOW) {
1525 for (tmout = 1000000; tmout; tmout--) {
1526 unsigned int msr = ioread8(up->membase + UART_MSR);
1527 if (msr & UART_MSR_CTS)
1530 touch_nmi_watchdog();
1535 #ifdef CONFIG_CONSOLE_POLL
1537 * Console polling routines for communicate via uart while
1538 * in an interrupt or debug context.
1540 static int pch_uart_get_poll_char(struct uart_port *port)
1542 struct eg20t_port *priv =
1543 container_of(port, struct eg20t_port, port);
1544 u8 lsr = ioread8(priv->membase + UART_LSR);
1546 if (!(lsr & UART_LSR_DR))
1547 return NO_POLL_CHAR;
1549 return ioread8(priv->membase + PCH_UART_RBR);
1553 static void pch_uart_put_poll_char(struct uart_port *port,
1557 struct eg20t_port *priv =
1558 container_of(port, struct eg20t_port, port);
1561 * First save the IER then disable the interrupts
1563 ier = ioread8(priv->membase + UART_IER);
1564 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1566 wait_for_xmitr(priv, UART_LSR_THRE);
1568 * Send the character out.
1569 * If a LF, also do CR...
1571 iowrite8(c, priv->membase + PCH_UART_THR);
1573 wait_for_xmitr(priv, UART_LSR_THRE);
1574 iowrite8(13, priv->membase + PCH_UART_THR);
1578 * Finally, wait for transmitter to become empty
1579 * and restore the IER
1581 wait_for_xmitr(priv, BOTH_EMPTY);
1582 iowrite8(ier, priv->membase + UART_IER);
1584 #endif /* CONFIG_CONSOLE_POLL */
1586 static struct uart_ops pch_uart_ops = {
1587 .tx_empty = pch_uart_tx_empty,
1588 .set_mctrl = pch_uart_set_mctrl,
1589 .get_mctrl = pch_uart_get_mctrl,
1590 .stop_tx = pch_uart_stop_tx,
1591 .start_tx = pch_uart_start_tx,
1592 .stop_rx = pch_uart_stop_rx,
1593 .enable_ms = pch_uart_enable_ms,
1594 .break_ctl = pch_uart_break_ctl,
1595 .startup = pch_uart_startup,
1596 .shutdown = pch_uart_shutdown,
1597 .set_termios = pch_uart_set_termios,
1598 /* .pm = pch_uart_pm, Not supported yet */
1599 /* .set_wake = pch_uart_set_wake, Not supported yet */
1600 .type = pch_uart_type,
1601 .release_port = pch_uart_release_port,
1602 .request_port = pch_uart_request_port,
1603 .config_port = pch_uart_config_port,
1604 .verify_port = pch_uart_verify_port,
1605 #ifdef CONFIG_CONSOLE_POLL
1606 .poll_get_char = pch_uart_get_poll_char,
1607 .poll_put_char = pch_uart_put_poll_char,
1611 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1613 static void pch_console_putchar(struct uart_port *port, int ch)
1615 struct eg20t_port *priv =
1616 container_of(port, struct eg20t_port, port);
1618 wait_for_xmitr(priv, UART_LSR_THRE);
1619 iowrite8(ch, priv->membase + PCH_UART_THR);
1623 * Print a string to the serial port trying not to disturb
1624 * any possible real use of the port...
1626 * The console_lock must be held when we get here.
1629 pch_console_write(struct console *co, const char *s, unsigned int count)
1631 struct eg20t_port *priv;
1632 unsigned long flags;
1633 int priv_locked = 1;
1634 int port_locked = 1;
1637 priv = pch_uart_ports[co->index];
1639 touch_nmi_watchdog();
1641 local_irq_save(flags);
1642 if (priv->port.sysrq) {
1643 /* call to uart_handle_sysrq_char already took the priv lock */
1645 /* serial8250_handle_port() already took the port lock */
1647 } else if (oops_in_progress) {
1648 priv_locked = spin_trylock(&priv->lock);
1649 port_locked = spin_trylock(&priv->port.lock);
1651 spin_lock(&priv->lock);
1652 spin_lock(&priv->port.lock);
1656 * First save the IER then disable the interrupts
1658 ier = ioread8(priv->membase + UART_IER);
1660 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1662 uart_console_write(&priv->port, s, count, pch_console_putchar);
1665 * Finally, wait for transmitter to become empty
1666 * and restore the IER
1668 wait_for_xmitr(priv, BOTH_EMPTY);
1669 iowrite8(ier, priv->membase + UART_IER);
1672 spin_unlock(&priv->port.lock);
1674 spin_unlock(&priv->lock);
1675 local_irq_restore(flags);
1678 static int __init pch_console_setup(struct console *co, char *options)
1680 struct uart_port *port;
1681 int baud = default_baud;
1687 * Check whether an invalid uart number has been specified, and
1688 * if so, search for the first available port that does have
1691 if (co->index >= PCH_UART_NR)
1693 port = &pch_uart_ports[co->index]->port;
1695 if (!port || (!port->iobase && !port->membase))
1698 port->uartclk = pch_uart_get_uartclk();
1701 uart_parse_options(options, &baud, &parity, &bits, &flow);
1703 return uart_set_options(port, co, baud, parity, bits, flow);
1706 static struct uart_driver pch_uart_driver;
1708 static struct console pch_console = {
1709 .name = PCH_UART_DRIVER_DEVICE,
1710 .write = pch_console_write,
1711 .device = uart_console_device,
1712 .setup = pch_console_setup,
1713 .flags = CON_PRINTBUFFER | CON_ANYTIME,
1715 .data = &pch_uart_driver,
1718 #define PCH_CONSOLE (&pch_console)
1720 #define PCH_CONSOLE NULL
1721 #endif /* CONFIG_SERIAL_PCH_UART_CONSOLE */
1723 static struct uart_driver pch_uart_driver = {
1724 .owner = THIS_MODULE,
1725 .driver_name = KBUILD_MODNAME,
1726 .dev_name = PCH_UART_DRIVER_DEVICE,
1730 .cons = PCH_CONSOLE,
1733 static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
1734 const struct pci_device_id *id)
1736 struct eg20t_port *priv;
1738 unsigned int iobase;
1739 unsigned int mapbase;
1740 unsigned char *rxbuf;
1743 struct pch_uart_driver_data *board;
1744 char name[32]; /* for debugfs file name */
1746 board = &drv_dat[id->driver_data];
1747 port_type = board->port_type;
1749 priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
1751 goto init_port_alloc_err;
1753 rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1755 goto init_port_free_txbuf;
1757 switch (port_type) {
1759 fifosize = 256; /* EG20T/ML7213: UART0 */
1762 fifosize = 64; /* EG20T:UART1~3 ML7213: UART1~2*/
1765 dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
1766 goto init_port_hal_free;
1769 pci_enable_msi(pdev);
1770 pci_set_master(pdev);
1772 spin_lock_init(&priv->lock);
1774 iobase = pci_resource_start(pdev, 0);
1775 mapbase = pci_resource_start(pdev, 1);
1776 priv->mapbase = mapbase;
1777 priv->iobase = iobase;
1780 priv->rxbuf.buf = rxbuf;
1781 priv->rxbuf.size = PAGE_SIZE;
1783 priv->fifo_size = fifosize;
1784 priv->uartclk = pch_uart_get_uartclk();
1785 priv->port_type = PORT_MAX_8250 + port_type + 1;
1786 priv->port.dev = &pdev->dev;
1787 priv->port.iobase = iobase;
1788 priv->port.membase = NULL;
1789 priv->port.mapbase = mapbase;
1790 priv->port.irq = pdev->irq;
1791 priv->port.iotype = UPIO_PORT;
1792 priv->port.ops = &pch_uart_ops;
1793 priv->port.flags = UPF_BOOT_AUTOCONF;
1794 priv->port.fifosize = fifosize;
1795 priv->port.line = board->line_no;
1796 priv->trigger = PCH_UART_HAL_TRIGGER_M;
1798 spin_lock_init(&priv->port.lock);
1800 pci_set_drvdata(pdev, priv);
1801 priv->trigger_level = 1;
1804 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1805 pch_uart_ports[board->line_no] = priv;
1807 ret = uart_add_one_port(&pch_uart_driver, &priv->port);
1809 goto init_port_hal_free;
1811 #ifdef CONFIG_DEBUG_FS
1812 snprintf(name, sizeof(name), "uart%d_regs", board->line_no);
1813 priv->debugfs = debugfs_create_file(name, S_IFREG | S_IRUGO,
1814 NULL, priv, &port_regs_ops);
1820 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1821 pch_uart_ports[board->line_no] = NULL;
1823 free_page((unsigned long)rxbuf);
1824 init_port_free_txbuf:
1826 init_port_alloc_err:
1831 static void pch_uart_exit_port(struct eg20t_port *priv)
1834 #ifdef CONFIG_DEBUG_FS
1836 debugfs_remove(priv->debugfs);
1838 uart_remove_one_port(&pch_uart_driver, &priv->port);
1839 pci_set_drvdata(priv->pdev, NULL);
1840 free_page((unsigned long)priv->rxbuf.buf);
1843 static void pch_uart_pci_remove(struct pci_dev *pdev)
1845 struct eg20t_port *priv = pci_get_drvdata(pdev);
1847 pci_disable_msi(pdev);
1849 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1850 pch_uart_ports[priv->port.line] = NULL;
1852 pch_uart_exit_port(priv);
1853 pci_disable_device(pdev);
1858 static int pch_uart_pci_suspend(struct pci_dev *pdev, pm_message_t state)
1860 struct eg20t_port *priv = pci_get_drvdata(pdev);
1862 uart_suspend_port(&pch_uart_driver, &priv->port);
1864 pci_save_state(pdev);
1865 pci_set_power_state(pdev, pci_choose_state(pdev, state));
1869 static int pch_uart_pci_resume(struct pci_dev *pdev)
1871 struct eg20t_port *priv = pci_get_drvdata(pdev);
1874 pci_set_power_state(pdev, PCI_D0);
1875 pci_restore_state(pdev);
1877 ret = pci_enable_device(pdev);
1880 "%s-pci_enable_device failed(ret=%d) ", __func__, ret);
1884 uart_resume_port(&pch_uart_driver, &priv->port);
1889 #define pch_uart_pci_suspend NULL
1890 #define pch_uart_pci_resume NULL
1893 static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
1894 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
1895 .driver_data = pch_et20t_uart0},
1896 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
1897 .driver_data = pch_et20t_uart1},
1898 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
1899 .driver_data = pch_et20t_uart2},
1900 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
1901 .driver_data = pch_et20t_uart3},
1902 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
1903 .driver_data = pch_ml7213_uart0},
1904 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
1905 .driver_data = pch_ml7213_uart1},
1906 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
1907 .driver_data = pch_ml7213_uart2},
1908 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C),
1909 .driver_data = pch_ml7223_uart0},
1910 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D),
1911 .driver_data = pch_ml7223_uart1},
1912 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8811),
1913 .driver_data = pch_ml7831_uart0},
1914 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8812),
1915 .driver_data = pch_ml7831_uart1},
1919 static int pch_uart_pci_probe(struct pci_dev *pdev,
1920 const struct pci_device_id *id)
1923 struct eg20t_port *priv;
1925 ret = pci_enable_device(pdev);
1929 priv = pch_uart_init_port(pdev, id);
1932 goto probe_disable_device;
1934 pci_set_drvdata(pdev, priv);
1938 probe_disable_device:
1939 pci_disable_msi(pdev);
1940 pci_disable_device(pdev);
1945 static struct pci_driver pch_uart_pci_driver = {
1947 .id_table = pch_uart_pci_id,
1948 .probe = pch_uart_pci_probe,
1949 .remove = pch_uart_pci_remove,
1950 .suspend = pch_uart_pci_suspend,
1951 .resume = pch_uart_pci_resume,
1954 static int __init pch_uart_module_init(void)
1958 /* register as UART driver */
1959 ret = uart_register_driver(&pch_uart_driver);
1963 /* register as PCI driver */
1964 ret = pci_register_driver(&pch_uart_pci_driver);
1966 uart_unregister_driver(&pch_uart_driver);
1970 module_init(pch_uart_module_init);
1972 static void __exit pch_uart_module_exit(void)
1974 pci_unregister_driver(&pch_uart_pci_driver);
1975 uart_unregister_driver(&pch_uart_driver);
1977 module_exit(pch_uart_module_exit);
1979 MODULE_LICENSE("GPL v2");
1980 MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
1981 module_param(default_baud, uint, S_IRUGO);
1982 MODULE_PARM_DESC(default_baud,
1983 "Default BAUD for initial driver state and console (default 9600)");
1984 module_param(user_uartclk, uint, S_IRUGO);
1985 MODULE_PARM_DESC(user_uartclk,
1986 "Override UART default or board specific UART clock");