1 // SPDX-License-Identifier: GPL-2.0
3 *Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
5 #include <linux/kernel.h>
6 #include <linux/serial.h>
7 #include <linux/serial_reg.h>
8 #include <linux/slab.h>
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/console.h>
12 #include <linux/serial_core.h>
13 #include <linux/tty.h>
14 #include <linux/tty_flip.h>
15 #include <linux/interrupt.h>
17 #include <linux/dmi.h>
18 #include <linux/nmi.h>
19 #include <linux/delay.h>
22 #include <linux/debugfs.h>
23 #include <linux/dmaengine.h>
24 #include <linux/pch_dma.h>
27 PCH_UART_HANDLED_RX_INT_SHIFT,
28 PCH_UART_HANDLED_TX_INT_SHIFT,
29 PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
30 PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
31 PCH_UART_HANDLED_MS_INT_SHIFT,
32 PCH_UART_HANDLED_LS_INT_SHIFT,
35 #define PCH_UART_DRIVER_DEVICE "ttyPCH"
37 /* Set the max number of UART port
38 * Intel EG20T PCH: 4 port
39 * LAPIS Semiconductor ML7213 IOH: 3 port
40 * LAPIS Semiconductor ML7223 IOH: 2 port
44 #define PCH_UART_HANDLED_RX_INT (1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
45 #define PCH_UART_HANDLED_TX_INT (1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
46 #define PCH_UART_HANDLED_RX_ERR_INT (1<<((\
47 PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1))
48 #define PCH_UART_HANDLED_RX_TRG_INT (1<<((\
49 PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1))
50 #define PCH_UART_HANDLED_MS_INT (1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1))
52 #define PCH_UART_HANDLED_LS_INT (1<<((PCH_UART_HANDLED_LS_INT_SHIFT)<<1))
54 #define PCH_UART_RBR 0x00
55 #define PCH_UART_THR 0x00
57 #define PCH_UART_IER_MASK (PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\
58 PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI)
59 #define PCH_UART_IER_ERBFI 0x00000001
60 #define PCH_UART_IER_ETBEI 0x00000002
61 #define PCH_UART_IER_ELSI 0x00000004
62 #define PCH_UART_IER_EDSSI 0x00000008
64 #define PCH_UART_IIR_IP 0x00000001
65 #define PCH_UART_IIR_IID 0x00000006
66 #define PCH_UART_IIR_MSI 0x00000000
67 #define PCH_UART_IIR_TRI 0x00000002
68 #define PCH_UART_IIR_RRI 0x00000004
69 #define PCH_UART_IIR_REI 0x00000006
70 #define PCH_UART_IIR_TOI 0x00000008
71 #define PCH_UART_IIR_FIFO256 0x00000020
72 #define PCH_UART_IIR_FIFO64 PCH_UART_IIR_FIFO256
73 #define PCH_UART_IIR_FE 0x000000C0
75 #define PCH_UART_FCR_FIFOE 0x00000001
76 #define PCH_UART_FCR_RFR 0x00000002
77 #define PCH_UART_FCR_TFR 0x00000004
78 #define PCH_UART_FCR_DMS 0x00000008
79 #define PCH_UART_FCR_FIFO256 0x00000020
80 #define PCH_UART_FCR_RFTL 0x000000C0
82 #define PCH_UART_FCR_RFTL1 0x00000000
83 #define PCH_UART_FCR_RFTL64 0x00000040
84 #define PCH_UART_FCR_RFTL128 0x00000080
85 #define PCH_UART_FCR_RFTL224 0x000000C0
86 #define PCH_UART_FCR_RFTL16 PCH_UART_FCR_RFTL64
87 #define PCH_UART_FCR_RFTL32 PCH_UART_FCR_RFTL128
88 #define PCH_UART_FCR_RFTL56 PCH_UART_FCR_RFTL224
89 #define PCH_UART_FCR_RFTL4 PCH_UART_FCR_RFTL64
90 #define PCH_UART_FCR_RFTL8 PCH_UART_FCR_RFTL128
91 #define PCH_UART_FCR_RFTL14 PCH_UART_FCR_RFTL224
92 #define PCH_UART_FCR_RFTL_SHIFT 6
94 #define PCH_UART_LCR_WLS 0x00000003
95 #define PCH_UART_LCR_STB 0x00000004
96 #define PCH_UART_LCR_PEN 0x00000008
97 #define PCH_UART_LCR_EPS 0x00000010
98 #define PCH_UART_LCR_SP 0x00000020
99 #define PCH_UART_LCR_SB 0x00000040
100 #define PCH_UART_LCR_DLAB 0x00000080
101 #define PCH_UART_LCR_NP 0x00000000
102 #define PCH_UART_LCR_OP PCH_UART_LCR_PEN
103 #define PCH_UART_LCR_EP (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS)
104 #define PCH_UART_LCR_1P (PCH_UART_LCR_PEN | PCH_UART_LCR_SP)
105 #define PCH_UART_LCR_0P (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS |\
108 #define PCH_UART_LCR_5BIT 0x00000000
109 #define PCH_UART_LCR_6BIT 0x00000001
110 #define PCH_UART_LCR_7BIT 0x00000002
111 #define PCH_UART_LCR_8BIT 0x00000003
113 #define PCH_UART_MCR_DTR 0x00000001
114 #define PCH_UART_MCR_RTS 0x00000002
115 #define PCH_UART_MCR_OUT 0x0000000C
116 #define PCH_UART_MCR_LOOP 0x00000010
117 #define PCH_UART_MCR_AFE 0x00000020
119 #define PCH_UART_LSR_DR 0x00000001
120 #define PCH_UART_LSR_ERR (1<<7)
122 #define PCH_UART_MSR_DCTS 0x00000001
123 #define PCH_UART_MSR_DDSR 0x00000002
124 #define PCH_UART_MSR_TERI 0x00000004
125 #define PCH_UART_MSR_DDCD 0x00000008
126 #define PCH_UART_MSR_CTS 0x00000010
127 #define PCH_UART_MSR_DSR 0x00000020
128 #define PCH_UART_MSR_RI 0x00000040
129 #define PCH_UART_MSR_DCD 0x00000080
130 #define PCH_UART_MSR_DELTA (PCH_UART_MSR_DCTS | PCH_UART_MSR_DDSR |\
131 PCH_UART_MSR_TERI | PCH_UART_MSR_DDCD)
133 #define PCH_UART_DLL 0x00
134 #define PCH_UART_DLM 0x01
136 #define PCH_UART_BRCSR 0x0E
138 #define PCH_UART_IID_RLS (PCH_UART_IIR_REI)
139 #define PCH_UART_IID_RDR (PCH_UART_IIR_RRI)
140 #define PCH_UART_IID_RDR_TO (PCH_UART_IIR_RRI | PCH_UART_IIR_TOI)
141 #define PCH_UART_IID_THRE (PCH_UART_IIR_TRI)
142 #define PCH_UART_IID_MS (PCH_UART_IIR_MSI)
144 #define PCH_UART_HAL_PARITY_NONE (PCH_UART_LCR_NP)
145 #define PCH_UART_HAL_PARITY_ODD (PCH_UART_LCR_OP)
146 #define PCH_UART_HAL_PARITY_EVEN (PCH_UART_LCR_EP)
147 #define PCH_UART_HAL_PARITY_FIX1 (PCH_UART_LCR_1P)
148 #define PCH_UART_HAL_PARITY_FIX0 (PCH_UART_LCR_0P)
149 #define PCH_UART_HAL_5BIT (PCH_UART_LCR_5BIT)
150 #define PCH_UART_HAL_6BIT (PCH_UART_LCR_6BIT)
151 #define PCH_UART_HAL_7BIT (PCH_UART_LCR_7BIT)
152 #define PCH_UART_HAL_8BIT (PCH_UART_LCR_8BIT)
153 #define PCH_UART_HAL_STB1 0
154 #define PCH_UART_HAL_STB2 (PCH_UART_LCR_STB)
156 #define PCH_UART_HAL_CLR_TX_FIFO (PCH_UART_FCR_TFR)
157 #define PCH_UART_HAL_CLR_RX_FIFO (PCH_UART_FCR_RFR)
158 #define PCH_UART_HAL_CLR_ALL_FIFO (PCH_UART_HAL_CLR_TX_FIFO | \
159 PCH_UART_HAL_CLR_RX_FIFO)
161 #define PCH_UART_HAL_DMA_MODE0 0
162 #define PCH_UART_HAL_FIFO_DIS 0
163 #define PCH_UART_HAL_FIFO16 (PCH_UART_FCR_FIFOE)
164 #define PCH_UART_HAL_FIFO256 (PCH_UART_FCR_FIFOE | \
165 PCH_UART_FCR_FIFO256)
166 #define PCH_UART_HAL_FIFO64 (PCH_UART_HAL_FIFO256)
167 #define PCH_UART_HAL_TRIGGER1 (PCH_UART_FCR_RFTL1)
168 #define PCH_UART_HAL_TRIGGER64 (PCH_UART_FCR_RFTL64)
169 #define PCH_UART_HAL_TRIGGER128 (PCH_UART_FCR_RFTL128)
170 #define PCH_UART_HAL_TRIGGER224 (PCH_UART_FCR_RFTL224)
171 #define PCH_UART_HAL_TRIGGER16 (PCH_UART_FCR_RFTL16)
172 #define PCH_UART_HAL_TRIGGER32 (PCH_UART_FCR_RFTL32)
173 #define PCH_UART_HAL_TRIGGER56 (PCH_UART_FCR_RFTL56)
174 #define PCH_UART_HAL_TRIGGER4 (PCH_UART_FCR_RFTL4)
175 #define PCH_UART_HAL_TRIGGER8 (PCH_UART_FCR_RFTL8)
176 #define PCH_UART_HAL_TRIGGER14 (PCH_UART_FCR_RFTL14)
177 #define PCH_UART_HAL_TRIGGER_L (PCH_UART_FCR_RFTL64)
178 #define PCH_UART_HAL_TRIGGER_M (PCH_UART_FCR_RFTL128)
179 #define PCH_UART_HAL_TRIGGER_H (PCH_UART_FCR_RFTL224)
181 #define PCH_UART_HAL_RX_INT (PCH_UART_IER_ERBFI)
182 #define PCH_UART_HAL_TX_INT (PCH_UART_IER_ETBEI)
183 #define PCH_UART_HAL_RX_ERR_INT (PCH_UART_IER_ELSI)
184 #define PCH_UART_HAL_MS_INT (PCH_UART_IER_EDSSI)
185 #define PCH_UART_HAL_ALL_INT (PCH_UART_IER_MASK)
187 #define PCH_UART_HAL_DTR (PCH_UART_MCR_DTR)
188 #define PCH_UART_HAL_RTS (PCH_UART_MCR_RTS)
189 #define PCH_UART_HAL_OUT (PCH_UART_MCR_OUT)
190 #define PCH_UART_HAL_LOOP (PCH_UART_MCR_LOOP)
191 #define PCH_UART_HAL_AFE (PCH_UART_MCR_AFE)
193 #define DEFAULT_UARTCLK 1843200 /* 1.8432 MHz */
194 #define CMITC_UARTCLK 192000000 /* 192.0000 MHz */
195 #define FRI2_64_UARTCLK 64000000 /* 64.0000 MHz */
196 #define FRI2_48_UARTCLK 48000000 /* 48.0000 MHz */
197 #define NTC1_UARTCLK 64000000 /* 64.0000 MHz */
198 #define MINNOW_UARTCLK 50000000 /* 50.0000 MHz */
200 struct pch_uart_buffer {
206 struct uart_port port;
208 void __iomem *membase;
209 resource_size_t mapbase;
211 struct pci_dev *pdev;
213 unsigned int uartclk;
219 struct pch_uart_buffer rxbuf;
223 unsigned int use_dma;
224 struct dma_async_tx_descriptor *desc_tx;
225 struct dma_async_tx_descriptor *desc_rx;
226 struct pch_dma_slave param_tx;
227 struct pch_dma_slave param_rx;
228 struct dma_chan *chan_tx;
229 struct dma_chan *chan_rx;
230 struct scatterlist *sg_tx_p;
233 struct scatterlist sg_rx;
236 dma_addr_t rx_buf_dma;
238 #define IRQ_NAME_SIZE 17
239 char irq_name[IRQ_NAME_SIZE];
241 /* protect the eg20t_port private structure and io access to membase */
246 * struct pch_uart_driver_data - private data structure for UART-DMA
247 * @port_type: The type of UART port
248 * @line_no: UART port line number (0, 1, 2...)
250 struct pch_uart_driver_data {
255 enum pch_uart_num_t {
269 static struct pch_uart_driver_data drv_dat[] = {
270 [pch_et20t_uart0] = {PORT_PCH_8LINE, 0},
271 [pch_et20t_uart1] = {PORT_PCH_2LINE, 1},
272 [pch_et20t_uart2] = {PORT_PCH_2LINE, 2},
273 [pch_et20t_uart3] = {PORT_PCH_2LINE, 3},
274 [pch_ml7213_uart0] = {PORT_PCH_8LINE, 0},
275 [pch_ml7213_uart1] = {PORT_PCH_2LINE, 1},
276 [pch_ml7213_uart2] = {PORT_PCH_2LINE, 2},
277 [pch_ml7223_uart0] = {PORT_PCH_8LINE, 0},
278 [pch_ml7223_uart1] = {PORT_PCH_2LINE, 1},
279 [pch_ml7831_uart0] = {PORT_PCH_8LINE, 0},
280 [pch_ml7831_uart1] = {PORT_PCH_2LINE, 1},
283 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
284 static struct eg20t_port *pch_uart_ports[PCH_UART_NR];
286 static unsigned int default_baud = 9600;
287 static unsigned int user_uartclk = 0;
288 static const int trigger_level_256[4] = { 1, 64, 128, 224 };
289 static const int trigger_level_64[4] = { 1, 16, 32, 56 };
290 static const int trigger_level_16[4] = { 1, 4, 8, 14 };
291 static const int trigger_level_1[4] = { 1, 1, 1, 1 };
293 #define PCH_REGS_BUFSIZE 1024
296 static ssize_t port_show_regs(struct file *file, char __user *user_buf,
297 size_t count, loff_t *ppos)
299 struct eg20t_port *priv = file->private_data;
305 buf = kzalloc(PCH_REGS_BUFSIZE, GFP_KERNEL);
309 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
310 "PCH EG20T port[%d] regs:\n", priv->port.line);
312 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
313 "=================================\n");
314 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
315 "IER: \t0x%02x\n", ioread8(priv->membase + UART_IER));
316 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
317 "IIR: \t0x%02x\n", ioread8(priv->membase + UART_IIR));
318 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
319 "LCR: \t0x%02x\n", ioread8(priv->membase + UART_LCR));
320 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
321 "MCR: \t0x%02x\n", ioread8(priv->membase + UART_MCR));
322 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
323 "LSR: \t0x%02x\n", ioread8(priv->membase + UART_LSR));
324 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
325 "MSR: \t0x%02x\n", ioread8(priv->membase + UART_MSR));
326 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
328 ioread8(priv->membase + PCH_UART_BRCSR));
330 lcr = ioread8(priv->membase + UART_LCR);
331 iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
332 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
333 "DLL: \t0x%02x\n", ioread8(priv->membase + UART_DLL));
334 len += scnprintf(buf + len, PCH_REGS_BUFSIZE - len,
335 "DLM: \t0x%02x\n", ioread8(priv->membase + UART_DLM));
336 iowrite8(lcr, priv->membase + UART_LCR);
338 if (len > PCH_REGS_BUFSIZE)
339 len = PCH_REGS_BUFSIZE;
341 ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
346 static const struct file_operations port_regs_ops = {
347 .owner = THIS_MODULE,
349 .read = port_show_regs,
350 .llseek = default_llseek,
353 static const struct dmi_system_id pch_uart_dmi_table[] = {
357 DMI_MATCH(DMI_BOARD_NAME, "CM-iTC"),
359 (void *)CMITC_UARTCLK,
364 DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
366 (void *)FRI2_64_UARTCLK,
369 .ident = "Fish River Island II",
371 DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
373 (void *)FRI2_48_UARTCLK,
378 DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
380 (void *)NTC1_UARTCLK,
383 .ident = "nanoETXexpress-TT",
385 DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
387 (void *)NTC1_UARTCLK,
390 .ident = "MinnowBoard",
392 DMI_MATCH(DMI_BOARD_NAME, "MinnowBoard"),
394 (void *)MINNOW_UARTCLK,
399 /* Return UART clock, checking for board specific clocks. */
400 static unsigned int pch_uart_get_uartclk(void)
402 const struct dmi_system_id *d;
407 d = dmi_first_match(pch_uart_dmi_table);
409 return (unsigned long)d->driver_data;
411 return DEFAULT_UARTCLK;
414 static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv,
417 u8 ier = ioread8(priv->membase + UART_IER);
418 ier |= flag & PCH_UART_IER_MASK;
419 iowrite8(ier, priv->membase + UART_IER);
422 static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
425 u8 ier = ioread8(priv->membase + UART_IER);
426 ier &= ~(flag & PCH_UART_IER_MASK);
427 iowrite8(ier, priv->membase + UART_IER);
430 static int pch_uart_hal_set_line(struct eg20t_port *priv, unsigned int baud,
431 unsigned int parity, unsigned int bits,
434 unsigned int dll, dlm, lcr;
437 div = DIV_ROUND_CLOSEST(priv->uartclk / 16, baud);
438 if (div < 0 || USHRT_MAX <= div) {
439 dev_err(priv->port.dev, "Invalid Baud(div=0x%x)\n", div);
443 dll = (unsigned int)div & 0x00FFU;
444 dlm = ((unsigned int)div >> 8) & 0x00FFU;
446 if (parity & ~(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS | PCH_UART_LCR_SP)) {
447 dev_err(priv->port.dev, "Invalid parity(0x%x)\n", parity);
451 if (bits & ~PCH_UART_LCR_WLS) {
452 dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits);
456 if (stb & ~PCH_UART_LCR_STB) {
457 dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb);
465 dev_dbg(priv->port.dev, "%s:baud = %u, div = %04x, lcr = %02x (%lu)\n",
466 __func__, baud, div, lcr, jiffies);
467 iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
468 iowrite8(dll, priv->membase + PCH_UART_DLL);
469 iowrite8(dlm, priv->membase + PCH_UART_DLM);
470 iowrite8(lcr, priv->membase + UART_LCR);
475 static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
478 if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) {
479 dev_err(priv->port.dev, "%s:Invalid flag(0x%x)\n",
484 iowrite8(PCH_UART_FCR_FIFOE | priv->fcr, priv->membase + UART_FCR);
485 iowrite8(PCH_UART_FCR_FIFOE | priv->fcr | flag,
486 priv->membase + UART_FCR);
487 iowrite8(priv->fcr, priv->membase + UART_FCR);
492 static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
493 unsigned int dmamode,
494 unsigned int fifo_size, unsigned int trigger)
498 if (dmamode & ~PCH_UART_FCR_DMS) {
499 dev_err(priv->port.dev, "%s:Invalid DMA Mode(0x%x)\n",
504 if (fifo_size & ~(PCH_UART_FCR_FIFOE | PCH_UART_FCR_FIFO256)) {
505 dev_err(priv->port.dev, "%s:Invalid FIFO SIZE(0x%x)\n",
506 __func__, fifo_size);
510 if (trigger & ~PCH_UART_FCR_RFTL) {
511 dev_err(priv->port.dev, "%s:Invalid TRIGGER(0x%x)\n",
516 switch (priv->fifo_size) {
518 priv->trigger_level =
519 trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT];
522 priv->trigger_level =
523 trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT];
526 priv->trigger_level =
527 trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT];
530 priv->trigger_level =
531 trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT];
535 dmamode | fifo_size | trigger | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR;
536 iowrite8(PCH_UART_FCR_FIFOE, priv->membase + UART_FCR);
537 iowrite8(PCH_UART_FCR_FIFOE | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR,
538 priv->membase + UART_FCR);
539 iowrite8(fcr, priv->membase + UART_FCR);
545 static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
547 unsigned int msr = ioread8(priv->membase + UART_MSR);
548 priv->dmsr = msr & PCH_UART_MSR_DELTA;
552 static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
557 struct uart_port *port = &priv->port;
559 lsr = ioread8(priv->membase + UART_LSR);
560 for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
561 i < rx_size && lsr & (UART_LSR_DR | UART_LSR_BI);
562 lsr = ioread8(priv->membase + UART_LSR)) {
563 rbr = ioread8(priv->membase + PCH_UART_RBR);
565 if (lsr & UART_LSR_BI) {
567 if (uart_handle_break(port))
570 if (uart_handle_sysrq_char(port, rbr))
578 static unsigned char pch_uart_hal_get_iid(struct eg20t_port *priv)
580 return ioread8(priv->membase + UART_IIR) &\
581 (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP);
584 static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
586 return ioread8(priv->membase + UART_LSR);
589 static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
593 lcr = ioread8(priv->membase + UART_LCR);
595 lcr |= PCH_UART_LCR_SB;
597 lcr &= ~PCH_UART_LCR_SB;
599 iowrite8(lcr, priv->membase + UART_LCR);
602 static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
605 struct uart_port *port = &priv->port;
606 struct tty_port *tport = &port->state->port;
608 tty_insert_flip_string(tport, buf, size);
609 tty_flip_buffer_push(tport);
614 static int dma_push_rx(struct eg20t_port *priv, int size)
617 struct uart_port *port = &priv->port;
618 struct tty_port *tport = &port->state->port;
620 room = tty_buffer_request_room(tport, size);
623 dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
628 tty_insert_flip_string(tport, sg_virt(&priv->sg_rx), size);
630 port->icount.rx += room;
635 static void pch_free_dma(struct uart_port *port)
637 struct eg20t_port *priv;
638 priv = container_of(port, struct eg20t_port, port);
641 dma_release_channel(priv->chan_tx);
642 priv->chan_tx = NULL;
645 dma_release_channel(priv->chan_rx);
646 priv->chan_rx = NULL;
649 if (priv->rx_buf_dma) {
650 dma_free_coherent(port->dev, port->fifosize, priv->rx_buf_virt,
652 priv->rx_buf_virt = NULL;
653 priv->rx_buf_dma = 0;
659 static bool filter(struct dma_chan *chan, void *slave)
661 struct pch_dma_slave *param = slave;
663 if ((chan->chan_id == param->chan_id) && (param->dma_dev ==
664 chan->device->dev)) {
665 chan->private = param;
672 static void pch_request_dma(struct uart_port *port)
675 struct dma_chan *chan;
676 struct pci_dev *dma_dev;
677 struct pch_dma_slave *param;
678 struct eg20t_port *priv =
679 container_of(port, struct eg20t_port, port);
681 dma_cap_set(DMA_SLAVE, mask);
683 /* Get DMA's dev information */
684 dma_dev = pci_get_slot(priv->pdev->bus,
685 PCI_DEVFN(PCI_SLOT(priv->pdev->devfn), 0));
688 param = &priv->param_tx;
689 param->dma_dev = &dma_dev->dev;
690 param->chan_id = priv->port.line * 2; /* Tx = 0, 2, 4, ... */
692 param->tx_reg = port->mapbase + UART_TX;
693 chan = dma_request_channel(mask, filter, param);
695 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
697 pci_dev_put(dma_dev);
700 priv->chan_tx = chan;
703 param = &priv->param_rx;
704 param->dma_dev = &dma_dev->dev;
705 param->chan_id = priv->port.line * 2 + 1; /* Rx = Tx + 1 */
707 param->rx_reg = port->mapbase + UART_RX;
708 chan = dma_request_channel(mask, filter, param);
710 dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Rx)\n",
712 dma_release_channel(priv->chan_tx);
713 priv->chan_tx = NULL;
714 pci_dev_put(dma_dev);
718 /* Get Consistent memory for DMA */
719 priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
720 &priv->rx_buf_dma, GFP_KERNEL);
721 priv->chan_rx = chan;
723 pci_dev_put(dma_dev);
726 static void pch_dma_rx_complete(void *arg)
728 struct eg20t_port *priv = arg;
729 struct uart_port *port = &priv->port;
732 dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
733 count = dma_push_rx(priv, priv->trigger_level);
735 tty_flip_buffer_push(&port->state->port);
736 async_tx_ack(priv->desc_rx);
737 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
738 PCH_UART_HAL_RX_ERR_INT);
741 static void pch_dma_tx_complete(void *arg)
743 struct eg20t_port *priv = arg;
744 struct uart_port *port = &priv->port;
745 struct scatterlist *sg = priv->sg_tx_p;
748 for (i = 0; i < priv->nent; i++, sg++)
749 uart_xmit_advance(port, sg_dma_len(sg));
751 async_tx_ack(priv->desc_tx);
752 dma_unmap_sg(port->dev, priv->sg_tx_p, priv->orig_nent, DMA_TO_DEVICE);
753 priv->tx_dma_use = 0;
756 kfree(priv->sg_tx_p);
757 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
760 static int handle_rx_to(struct eg20t_port *priv)
762 struct pch_uart_buffer *buf;
765 if (!priv->start_rx) {
766 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
767 PCH_UART_HAL_RX_ERR_INT);
772 rx_size = pch_uart_hal_read(priv, buf->buf, buf->size);
773 ret = push_rx(priv, buf->buf, rx_size);
776 } while (rx_size == buf->size);
778 return PCH_UART_HANDLED_RX_INT;
781 static int handle_rx(struct eg20t_port *priv)
783 return handle_rx_to(priv);
786 static int dma_handle_rx(struct eg20t_port *priv)
788 struct uart_port *port = &priv->port;
789 struct dma_async_tx_descriptor *desc;
790 struct scatterlist *sg;
792 priv = container_of(port, struct eg20t_port, port);
795 sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */
797 sg_dma_len(sg) = priv->trigger_level;
799 sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt),
800 sg_dma_len(sg), offset_in_page(priv->rx_buf_virt));
802 sg_dma_address(sg) = priv->rx_buf_dma;
804 desc = dmaengine_prep_slave_sg(priv->chan_rx,
805 sg, 1, DMA_DEV_TO_MEM,
806 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
811 priv->desc_rx = desc;
812 desc->callback = pch_dma_rx_complete;
813 desc->callback_param = priv;
814 desc->tx_submit(desc);
815 dma_async_issue_pending(priv->chan_rx);
817 return PCH_UART_HANDLED_RX_INT;
820 static unsigned int handle_tx(struct eg20t_port *priv)
822 struct uart_port *port = &priv->port;
823 struct circ_buf *xmit = &port->state->xmit;
827 if (!priv->start_tx) {
828 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
830 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
835 fifo_size = max(priv->fifo_size, 1);
838 iowrite8(port->x_char, priv->membase + PCH_UART_THR);
845 while (!uart_tx_stopped(port) && !uart_circ_empty(xmit) && fifo_size) {
846 iowrite8(xmit->buf[xmit->tail], priv->membase + PCH_UART_THR);
847 uart_xmit_advance(port, 1);
852 priv->tx_empty = tx_empty;
855 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
856 uart_write_wakeup(port);
859 return PCH_UART_HANDLED_TX_INT;
862 static unsigned int dma_handle_tx(struct eg20t_port *priv)
864 struct uart_port *port = &priv->port;
865 struct circ_buf *xmit = &port->state->xmit;
866 struct scatterlist *sg;
869 struct dma_async_tx_descriptor *desc;
876 if (!priv->start_tx) {
877 dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
879 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
884 if (priv->tx_dma_use) {
885 dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n",
887 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
892 fifo_size = max(priv->fifo_size, 1);
895 iowrite8(port->x_char, priv->membase + PCH_UART_THR);
901 bytes = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
903 dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__);
904 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
905 uart_write_wakeup(port);
909 if (bytes > fifo_size) {
910 num = bytes / fifo_size + 1;
912 rem = bytes % fifo_size;
919 dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n",
920 __func__, num, size, rem);
922 priv->tx_dma_use = 1;
924 priv->sg_tx_p = kmalloc_array(num, sizeof(struct scatterlist), GFP_ATOMIC);
925 if (!priv->sg_tx_p) {
926 dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__);
930 sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
933 for (i = 0; i < num; i++, sg++) {
935 sg_set_page(sg, virt_to_page(xmit->buf),
938 sg_set_page(sg, virt_to_page(xmit->buf),
939 size, fifo_size * i);
943 nent = dma_map_sg(port->dev, sg, num, DMA_TO_DEVICE);
945 dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__);
948 priv->orig_nent = num;
951 for (i = 0; i < nent; i++, sg++) {
952 sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) +
954 sg_dma_address(sg) = (sg_dma_address(sg) &
955 ~(UART_XMIT_SIZE - 1)) + sg->offset;
957 sg_dma_len(sg) = rem;
959 sg_dma_len(sg) = size;
962 desc = dmaengine_prep_slave_sg(priv->chan_tx,
963 priv->sg_tx_p, nent, DMA_MEM_TO_DEV,
964 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
966 dev_err(priv->port.dev, "%s:dmaengine_prep_slave_sg Failed\n",
970 dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE);
971 priv->desc_tx = desc;
972 desc->callback = pch_dma_tx_complete;
973 desc->callback_param = priv;
975 desc->tx_submit(desc);
977 dma_async_issue_pending(priv->chan_tx);
979 return PCH_UART_HANDLED_TX_INT;
982 static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
984 struct uart_port *port = &priv->port;
985 struct tty_struct *tty = tty_port_tty_get(&port->state->port);
986 char *error_msg[5] = {};
989 if (lsr & PCH_UART_LSR_ERR)
990 error_msg[i++] = "Error data in FIFO\n";
992 if (lsr & UART_LSR_FE) {
993 port->icount.frame++;
994 error_msg[i++] = " Framing Error\n";
997 if (lsr & UART_LSR_PE) {
998 port->icount.parity++;
999 error_msg[i++] = " Parity Error\n";
1002 if (lsr & UART_LSR_OE) {
1003 port->icount.overrun++;
1004 error_msg[i++] = " Overrun Error\n";
1008 for (i = 0; error_msg[i] != NULL; i++)
1009 dev_err(&priv->pdev->dev, error_msg[i]);
1015 static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
1017 struct eg20t_port *priv = dev_id;
1018 unsigned int handled;
1022 unsigned long flags;
1026 spin_lock_irqsave(&priv->lock, flags);
1029 iid = pch_uart_hal_get_iid(priv);
1030 if (iid & PCH_UART_IIR_IP) /* No Interrupt */
1033 case PCH_UART_IID_RLS: /* Receiver Line Status */
1034 lsr = pch_uart_hal_get_line_status(priv);
1035 if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
1036 UART_LSR_PE | UART_LSR_OE)) {
1037 pch_uart_err_ir(priv, lsr);
1038 ret = PCH_UART_HANDLED_RX_ERR_INT;
1040 ret = PCH_UART_HANDLED_LS_INT;
1043 case PCH_UART_IID_RDR: /* Received Data Ready */
1044 if (priv->use_dma) {
1045 pch_uart_hal_disable_interrupt(priv,
1046 PCH_UART_HAL_RX_INT |
1047 PCH_UART_HAL_RX_ERR_INT);
1048 ret = dma_handle_rx(priv);
1050 pch_uart_hal_enable_interrupt(priv,
1051 PCH_UART_HAL_RX_INT |
1052 PCH_UART_HAL_RX_ERR_INT);
1054 ret = handle_rx(priv);
1057 case PCH_UART_IID_RDR_TO: /* Received Data Ready
1059 ret = handle_rx_to(priv);
1061 case PCH_UART_IID_THRE: /* Transmitter Holding Register
1064 ret = dma_handle_tx(priv);
1066 ret = handle_tx(priv);
1068 case PCH_UART_IID_MS: /* Modem Status */
1069 msr = pch_uart_hal_get_modem(priv);
1070 next = 0; /* MS ir prioirty is the lowest. So, MS ir
1071 means final interrupt */
1072 if ((msr & UART_MSR_ANY_DELTA) == 0)
1074 ret |= PCH_UART_HANDLED_MS_INT;
1076 default: /* Never junp to this label */
1077 dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__,
1083 handled |= (unsigned int)ret;
1086 spin_unlock_irqrestore(&priv->lock, flags);
1087 return IRQ_RETVAL(handled);
1090 /* This function tests whether the transmitter fifo and shifter for the port
1091 described by 'port' is empty. */
1092 static unsigned int pch_uart_tx_empty(struct uart_port *port)
1094 struct eg20t_port *priv;
1096 priv = container_of(port, struct eg20t_port, port);
1098 return TIOCSER_TEMT;
1103 /* Returns the current state of modem control inputs. */
1104 static unsigned int pch_uart_get_mctrl(struct uart_port *port)
1106 struct eg20t_port *priv;
1108 unsigned int ret = 0;
1110 priv = container_of(port, struct eg20t_port, port);
1111 modem = pch_uart_hal_get_modem(priv);
1113 if (modem & UART_MSR_DCD)
1116 if (modem & UART_MSR_RI)
1119 if (modem & UART_MSR_DSR)
1122 if (modem & UART_MSR_CTS)
1128 static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1131 struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
1133 if (mctrl & TIOCM_DTR)
1134 mcr |= UART_MCR_DTR;
1135 if (mctrl & TIOCM_RTS)
1136 mcr |= UART_MCR_RTS;
1137 if (mctrl & TIOCM_LOOP)
1138 mcr |= UART_MCR_LOOP;
1140 if (priv->mcr & UART_MCR_AFE)
1141 mcr |= UART_MCR_AFE;
1144 iowrite8(mcr, priv->membase + UART_MCR);
1147 static void pch_uart_stop_tx(struct uart_port *port)
1149 struct eg20t_port *priv;
1150 priv = container_of(port, struct eg20t_port, port);
1152 priv->tx_dma_use = 0;
1155 static void pch_uart_start_tx(struct uart_port *port)
1157 struct eg20t_port *priv;
1159 priv = container_of(port, struct eg20t_port, port);
1161 if (priv->use_dma) {
1162 if (priv->tx_dma_use) {
1163 dev_dbg(priv->port.dev, "%s : Tx DMA is NOT empty.\n",
1170 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
1173 static void pch_uart_stop_rx(struct uart_port *port)
1175 struct eg20t_port *priv;
1176 priv = container_of(port, struct eg20t_port, port);
1178 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
1179 PCH_UART_HAL_RX_ERR_INT);
1182 /* Enable the modem status interrupts. */
1183 static void pch_uart_enable_ms(struct uart_port *port)
1185 struct eg20t_port *priv;
1186 priv = container_of(port, struct eg20t_port, port);
1187 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
1190 /* Control the transmission of a break signal. */
1191 static void pch_uart_break_ctl(struct uart_port *port, int ctl)
1193 struct eg20t_port *priv;
1194 unsigned long flags;
1196 priv = container_of(port, struct eg20t_port, port);
1197 spin_lock_irqsave(&priv->lock, flags);
1198 pch_uart_hal_set_break(priv, ctl);
1199 spin_unlock_irqrestore(&priv->lock, flags);
1202 /* Grab any interrupt resources and initialise any low level driver state. */
1203 static int pch_uart_startup(struct uart_port *port)
1205 struct eg20t_port *priv;
1210 priv = container_of(port, struct eg20t_port, port);
1214 priv->uartclk = port->uartclk;
1216 port->uartclk = priv->uartclk;
1218 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1219 ret = pch_uart_hal_set_line(priv, default_baud,
1220 PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
1225 switch (priv->fifo_size) {
1227 fifo_size = PCH_UART_HAL_FIFO256;
1230 fifo_size = PCH_UART_HAL_FIFO64;
1233 fifo_size = PCH_UART_HAL_FIFO16;
1237 fifo_size = PCH_UART_HAL_FIFO_DIS;
1241 switch (priv->trigger) {
1242 case PCH_UART_HAL_TRIGGER1:
1245 case PCH_UART_HAL_TRIGGER_L:
1246 trigger_level = priv->fifo_size / 4;
1248 case PCH_UART_HAL_TRIGGER_M:
1249 trigger_level = priv->fifo_size / 2;
1251 case PCH_UART_HAL_TRIGGER_H:
1253 trigger_level = priv->fifo_size - (priv->fifo_size / 8);
1257 priv->trigger_level = trigger_level;
1258 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1259 fifo_size, priv->trigger);
1263 ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
1264 priv->irq_name, priv);
1269 pch_request_dma(port);
1272 pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
1273 PCH_UART_HAL_RX_ERR_INT);
1274 uart_update_timeout(port, CS8, default_baud);
1279 static void pch_uart_shutdown(struct uart_port *port)
1281 struct eg20t_port *priv;
1284 priv = container_of(port, struct eg20t_port, port);
1285 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1286 pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
1287 ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
1288 PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
1290 dev_err(priv->port.dev,
1291 "pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);
1295 free_irq(priv->port.irq, priv);
1298 /* Change the port parameters, including word length, parity, stop
1299 *bits. Update read_status_mask and ignore_status_mask to indicate
1300 *the types of events we are interested in receiving. */
1301 static void pch_uart_set_termios(struct uart_port *port,
1302 struct ktermios *termios,
1303 const struct ktermios *old)
1306 unsigned int baud, parity, bits, stb;
1307 struct eg20t_port *priv;
1308 unsigned long flags;
1310 priv = container_of(port, struct eg20t_port, port);
1311 switch (termios->c_cflag & CSIZE) {
1313 bits = PCH_UART_HAL_5BIT;
1316 bits = PCH_UART_HAL_6BIT;
1319 bits = PCH_UART_HAL_7BIT;
1322 bits = PCH_UART_HAL_8BIT;
1325 if (termios->c_cflag & CSTOPB)
1326 stb = PCH_UART_HAL_STB2;
1328 stb = PCH_UART_HAL_STB1;
1330 if (termios->c_cflag & PARENB) {
1331 if (termios->c_cflag & PARODD)
1332 parity = PCH_UART_HAL_PARITY_ODD;
1334 parity = PCH_UART_HAL_PARITY_EVEN;
1337 parity = PCH_UART_HAL_PARITY_NONE;
1339 /* Only UART0 has auto hardware flow function */
1340 if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256))
1341 priv->mcr |= UART_MCR_AFE;
1343 priv->mcr &= ~UART_MCR_AFE;
1345 termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
1347 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
1349 spin_lock_irqsave(&priv->lock, flags);
1350 uart_port_lock(port);
1352 uart_update_timeout(port, termios->c_cflag, baud);
1353 rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
1357 pch_uart_set_mctrl(&priv->port, priv->port.mctrl);
1358 /* Don't rewrite B0 */
1359 if (tty_termios_baud_rate(termios))
1360 tty_termios_encode_baud_rate(termios, baud, baud);
1363 uart_port_unlock(port);
1364 spin_unlock_irqrestore(&priv->lock, flags);
1367 static const char *pch_uart_type(struct uart_port *port)
1369 return KBUILD_MODNAME;
1372 static void pch_uart_release_port(struct uart_port *port)
1374 struct eg20t_port *priv;
1376 priv = container_of(port, struct eg20t_port, port);
1377 pci_iounmap(priv->pdev, priv->membase);
1378 pci_release_regions(priv->pdev);
1381 static int pch_uart_request_port(struct uart_port *port)
1383 struct eg20t_port *priv;
1385 void __iomem *membase;
1387 priv = container_of(port, struct eg20t_port, port);
1388 ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
1392 membase = pci_iomap(priv->pdev, 1, 0);
1394 pci_release_regions(priv->pdev);
1397 priv->membase = port->membase = membase;
1402 static void pch_uart_config_port(struct uart_port *port, int type)
1404 struct eg20t_port *priv;
1406 priv = container_of(port, struct eg20t_port, port);
1407 if (type & UART_CONFIG_TYPE) {
1408 port->type = priv->port_type;
1409 pch_uart_request_port(port);
1413 static int pch_uart_verify_port(struct uart_port *port,
1414 struct serial_struct *serinfo)
1416 struct eg20t_port *priv;
1418 priv = container_of(port, struct eg20t_port, port);
1419 if (serinfo->flags & UPF_LOW_LATENCY) {
1420 dev_info(priv->port.dev,
1421 "PCH UART : Use PIO Mode (without DMA)\n");
1423 serinfo->flags &= ~UPF_LOW_LATENCY;
1425 #ifndef CONFIG_PCH_DMA
1426 dev_err(priv->port.dev, "%s : PCH DMA is not Loaded.\n",
1430 if (!priv->use_dma) {
1431 pch_request_dma(port);
1435 dev_info(priv->port.dev, "PCH UART: %s\n",
1437 "Use DMA Mode" : "No DMA");
1443 #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_PCH_UART_CONSOLE)
1445 * Wait for transmitter & holding register to empty
1447 static void wait_for_xmitr(struct eg20t_port *up, int bits)
1449 unsigned int status, tmout = 10000;
1451 /* Wait up to 10ms for the character(s) to be sent. */
1453 status = ioread8(up->membase + UART_LSR);
1455 if ((status & bits) == bits)
1462 /* Wait up to 1s for flow control if necessary */
1463 if (up->port.flags & UPF_CONS_FLOW) {
1465 for (tmout = 1000000; tmout; tmout--) {
1466 unsigned int msr = ioread8(up->membase + UART_MSR);
1467 if (msr & UART_MSR_CTS)
1470 touch_nmi_watchdog();
1474 #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_PCH_UART_CONSOLE */
1476 #ifdef CONFIG_CONSOLE_POLL
1478 * Console polling routines for communicate via uart while
1479 * in an interrupt or debug context.
1481 static int pch_uart_get_poll_char(struct uart_port *port)
1483 struct eg20t_port *priv =
1484 container_of(port, struct eg20t_port, port);
1485 u8 lsr = ioread8(priv->membase + UART_LSR);
1487 if (!(lsr & UART_LSR_DR))
1488 return NO_POLL_CHAR;
1490 return ioread8(priv->membase + PCH_UART_RBR);
1494 static void pch_uart_put_poll_char(struct uart_port *port,
1498 struct eg20t_port *priv =
1499 container_of(port, struct eg20t_port, port);
1502 * First save the IER then disable the interrupts
1504 ier = ioread8(priv->membase + UART_IER);
1505 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1507 wait_for_xmitr(priv, UART_LSR_THRE);
1509 * Send the character out.
1511 iowrite8(c, priv->membase + PCH_UART_THR);
1514 * Finally, wait for transmitter to become empty
1515 * and restore the IER
1517 wait_for_xmitr(priv, UART_LSR_BOTH_EMPTY);
1518 iowrite8(ier, priv->membase + UART_IER);
1520 #endif /* CONFIG_CONSOLE_POLL */
1522 static const struct uart_ops pch_uart_ops = {
1523 .tx_empty = pch_uart_tx_empty,
1524 .set_mctrl = pch_uart_set_mctrl,
1525 .get_mctrl = pch_uart_get_mctrl,
1526 .stop_tx = pch_uart_stop_tx,
1527 .start_tx = pch_uart_start_tx,
1528 .stop_rx = pch_uart_stop_rx,
1529 .enable_ms = pch_uart_enable_ms,
1530 .break_ctl = pch_uart_break_ctl,
1531 .startup = pch_uart_startup,
1532 .shutdown = pch_uart_shutdown,
1533 .set_termios = pch_uart_set_termios,
1534 /* .pm = pch_uart_pm, Not supported yet */
1535 .type = pch_uart_type,
1536 .release_port = pch_uart_release_port,
1537 .request_port = pch_uart_request_port,
1538 .config_port = pch_uart_config_port,
1539 .verify_port = pch_uart_verify_port,
1540 #ifdef CONFIG_CONSOLE_POLL
1541 .poll_get_char = pch_uart_get_poll_char,
1542 .poll_put_char = pch_uart_put_poll_char,
1546 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1548 static void pch_console_putchar(struct uart_port *port, unsigned char ch)
1550 struct eg20t_port *priv =
1551 container_of(port, struct eg20t_port, port);
1553 wait_for_xmitr(priv, UART_LSR_THRE);
1554 iowrite8(ch, priv->membase + PCH_UART_THR);
1558 * Print a string to the serial port trying not to disturb
1559 * any possible real use of the port...
1561 * The console_lock must be held when we get here.
1564 pch_console_write(struct console *co, const char *s, unsigned int count)
1566 struct eg20t_port *priv;
1567 unsigned long flags;
1568 int priv_locked = 1;
1569 int port_locked = 1;
1572 priv = pch_uart_ports[co->index];
1574 touch_nmi_watchdog();
1576 local_irq_save(flags);
1577 if (priv->port.sysrq) {
1578 /* call to uart_handle_sysrq_char already took the priv lock */
1580 /* serial8250_handle_port() already took the port lock */
1582 } else if (oops_in_progress) {
1583 priv_locked = spin_trylock(&priv->lock);
1584 port_locked = uart_port_trylock(&priv->port);
1586 spin_lock(&priv->lock);
1587 uart_port_lock(&priv->port);
1591 * First save the IER then disable the interrupts
1593 ier = ioread8(priv->membase + UART_IER);
1595 pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
1597 uart_console_write(&priv->port, s, count, pch_console_putchar);
1600 * Finally, wait for transmitter to become empty
1601 * and restore the IER
1603 wait_for_xmitr(priv, UART_LSR_BOTH_EMPTY);
1604 iowrite8(ier, priv->membase + UART_IER);
1607 uart_port_unlock(&priv->port);
1609 spin_unlock(&priv->lock);
1610 local_irq_restore(flags);
1613 static int __init pch_console_setup(struct console *co, char *options)
1615 struct uart_port *port;
1616 int baud = default_baud;
1622 * Check whether an invalid uart number has been specified, and
1623 * if so, search for the first available port that does have
1626 if (co->index >= PCH_UART_NR)
1628 port = &pch_uart_ports[co->index]->port;
1630 if (!port || (!port->iobase && !port->membase))
1633 port->uartclk = pch_uart_get_uartclk();
1636 uart_parse_options(options, &baud, &parity, &bits, &flow);
1638 return uart_set_options(port, co, baud, parity, bits, flow);
1641 static struct uart_driver pch_uart_driver;
1643 static struct console pch_console = {
1644 .name = PCH_UART_DRIVER_DEVICE,
1645 .write = pch_console_write,
1646 .device = uart_console_device,
1647 .setup = pch_console_setup,
1648 .flags = CON_PRINTBUFFER | CON_ANYTIME,
1650 .data = &pch_uart_driver,
1653 #define PCH_CONSOLE (&pch_console)
1655 #define PCH_CONSOLE NULL
1656 #endif /* CONFIG_SERIAL_PCH_UART_CONSOLE */
1658 static struct uart_driver pch_uart_driver = {
1659 .owner = THIS_MODULE,
1660 .driver_name = KBUILD_MODNAME,
1661 .dev_name = PCH_UART_DRIVER_DEVICE,
1665 .cons = PCH_CONSOLE,
1668 static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
1669 const struct pci_device_id *id)
1671 struct eg20t_port *priv;
1673 unsigned int iobase;
1674 unsigned int mapbase;
1675 unsigned char *rxbuf;
1678 struct pch_uart_driver_data *board;
1681 board = &drv_dat[id->driver_data];
1682 port_type = board->port_type;
1684 priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
1686 goto init_port_alloc_err;
1688 rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1690 goto init_port_free_txbuf;
1692 switch (port_type) {
1693 case PORT_PCH_8LINE:
1694 fifosize = 256; /* EG20T/ML7213: UART0 */
1696 case PORT_PCH_2LINE:
1697 fifosize = 64; /* EG20T:UART1~3 ML7213: UART1~2*/
1700 dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
1701 goto init_port_hal_free;
1704 pci_enable_msi(pdev);
1705 pci_set_master(pdev);
1707 spin_lock_init(&priv->lock);
1709 iobase = pci_resource_start(pdev, 0);
1710 mapbase = pci_resource_start(pdev, 1);
1711 priv->mapbase = mapbase;
1712 priv->iobase = iobase;
1715 priv->rxbuf.buf = rxbuf;
1716 priv->rxbuf.size = PAGE_SIZE;
1718 priv->fifo_size = fifosize;
1719 priv->uartclk = pch_uart_get_uartclk();
1720 priv->port_type = port_type;
1721 priv->port.dev = &pdev->dev;
1722 priv->port.iobase = iobase;
1723 priv->port.membase = NULL;
1724 priv->port.mapbase = mapbase;
1725 priv->port.irq = pdev->irq;
1726 priv->port.iotype = UPIO_PORT;
1727 priv->port.ops = &pch_uart_ops;
1728 priv->port.flags = UPF_BOOT_AUTOCONF;
1729 priv->port.fifosize = fifosize;
1730 priv->port.line = board->line_no;
1731 priv->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PCH_UART_CONSOLE);
1732 priv->trigger = PCH_UART_HAL_TRIGGER_M;
1734 snprintf(priv->irq_name, IRQ_NAME_SIZE,
1735 KBUILD_MODNAME ":" PCH_UART_DRIVER_DEVICE "%d",
1738 spin_lock_init(&priv->port.lock);
1740 pci_set_drvdata(pdev, priv);
1741 priv->trigger_level = 1;
1744 if (pdev->dev.of_node)
1745 of_property_read_u32(pdev->dev.of_node, "clock-frequency"
1748 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1749 pch_uart_ports[board->line_no] = priv;
1751 ret = uart_add_one_port(&pch_uart_driver, &priv->port);
1753 goto init_port_hal_free;
1755 snprintf(name, sizeof(name), "uart%d_regs", priv->port.line);
1756 debugfs_create_file(name, S_IFREG | S_IRUGO, NULL, priv,
1762 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1763 pch_uart_ports[board->line_no] = NULL;
1765 free_page((unsigned long)rxbuf);
1766 init_port_free_txbuf:
1768 init_port_alloc_err:
1773 static void pch_uart_exit_port(struct eg20t_port *priv)
1777 snprintf(name, sizeof(name), "uart%d_regs", priv->port.line);
1778 debugfs_lookup_and_remove(name, NULL);
1779 uart_remove_one_port(&pch_uart_driver, &priv->port);
1780 free_page((unsigned long)priv->rxbuf.buf);
1783 static void pch_uart_pci_remove(struct pci_dev *pdev)
1785 struct eg20t_port *priv = pci_get_drvdata(pdev);
1787 pci_disable_msi(pdev);
1789 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
1790 pch_uart_ports[priv->port.line] = NULL;
1792 pch_uart_exit_port(priv);
1793 pci_disable_device(pdev);
1798 static int __maybe_unused pch_uart_pci_suspend(struct device *dev)
1800 struct eg20t_port *priv = dev_get_drvdata(dev);
1802 uart_suspend_port(&pch_uart_driver, &priv->port);
1807 static int __maybe_unused pch_uart_pci_resume(struct device *dev)
1809 struct eg20t_port *priv = dev_get_drvdata(dev);
1811 uart_resume_port(&pch_uart_driver, &priv->port);
1816 static const struct pci_device_id pch_uart_pci_id[] = {
1817 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
1818 .driver_data = pch_et20t_uart0},
1819 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
1820 .driver_data = pch_et20t_uart1},
1821 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
1822 .driver_data = pch_et20t_uart2},
1823 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
1824 .driver_data = pch_et20t_uart3},
1825 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
1826 .driver_data = pch_ml7213_uart0},
1827 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
1828 .driver_data = pch_ml7213_uart1},
1829 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
1830 .driver_data = pch_ml7213_uart2},
1831 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C),
1832 .driver_data = pch_ml7223_uart0},
1833 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D),
1834 .driver_data = pch_ml7223_uart1},
1835 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8811),
1836 .driver_data = pch_ml7831_uart0},
1837 {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8812),
1838 .driver_data = pch_ml7831_uart1},
1842 static int pch_uart_pci_probe(struct pci_dev *pdev,
1843 const struct pci_device_id *id)
1846 struct eg20t_port *priv;
1848 ret = pci_enable_device(pdev);
1852 priv = pch_uart_init_port(pdev, id);
1855 goto probe_disable_device;
1857 pci_set_drvdata(pdev, priv);
1861 probe_disable_device:
1862 pci_disable_msi(pdev);
1863 pci_disable_device(pdev);
1868 static SIMPLE_DEV_PM_OPS(pch_uart_pci_pm_ops,
1869 pch_uart_pci_suspend,
1870 pch_uart_pci_resume);
1872 static struct pci_driver pch_uart_pci_driver = {
1874 .id_table = pch_uart_pci_id,
1875 .probe = pch_uart_pci_probe,
1876 .remove = pch_uart_pci_remove,
1877 .driver.pm = &pch_uart_pci_pm_ops,
1880 static int __init pch_uart_module_init(void)
1884 /* register as UART driver */
1885 ret = uart_register_driver(&pch_uart_driver);
1889 /* register as PCI driver */
1890 ret = pci_register_driver(&pch_uart_pci_driver);
1892 uart_unregister_driver(&pch_uart_driver);
1896 module_init(pch_uart_module_init);
1898 static void __exit pch_uart_module_exit(void)
1900 pci_unregister_driver(&pch_uart_pci_driver);
1901 uart_unregister_driver(&pch_uart_driver);
1903 module_exit(pch_uart_module_exit);
1905 MODULE_LICENSE("GPL v2");
1906 MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
1907 MODULE_DEVICE_TABLE(pci, pch_uart_pci_id);
1909 module_param(default_baud, uint, S_IRUGO);
1910 MODULE_PARM_DESC(default_baud,
1911 "Default BAUD for initial driver state and console (default 9600)");
1912 module_param(user_uartclk, uint, S_IRUGO);
1913 MODULE_PARM_DESC(user_uartclk,
1914 "Override UART default or board specific UART clock");