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