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dm: Rename dev_addr..() functions
[people/ms/u-boot.git] / drivers / serial / ns16550.c
1 /*
2 * COM1 NS16550 support
3 * originally from linux source (arch/powerpc/boot/ns16550.c)
4 * modified to use CONFIG_SYS_ISA_MEM and new defines
5 */
6
7 #include <common.h>
8 #include <clk.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <fdtdec.h>
12 #include <ns16550.h>
13 #include <serial.h>
14 #include <watchdog.h>
15 #include <linux/types.h>
16 #include <asm/io.h>
17
18 DECLARE_GLOBAL_DATA_PTR;
19
20 #define UART_LCRVAL UART_LCR_8N1 /* 8 data, 1 stop, no parity */
21 #define UART_MCRVAL (UART_MCR_DTR | \
22 UART_MCR_RTS) /* RTS/DTR */
23
24 #ifndef CONFIG_DM_SERIAL
25 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
26 #define serial_out(x, y) outb(x, (ulong)y)
27 #define serial_in(y) inb((ulong)y)
28 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0)
29 #define serial_out(x, y) out_be32(y, x)
30 #define serial_in(y) in_be32(y)
31 #elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0)
32 #define serial_out(x, y) out_le32(y, x)
33 #define serial_in(y) in_le32(y)
34 #else
35 #define serial_out(x, y) writeb(x, y)
36 #define serial_in(y) readb(y)
37 #endif
38 #endif /* !CONFIG_DM_SERIAL */
39
40 #if defined(CONFIG_SOC_KEYSTONE)
41 #define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0
42 #define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 0))
43 #undef UART_MCRVAL
44 #ifdef CONFIG_SERIAL_HW_FLOW_CONTROL
45 #define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE)
46 #else
47 #define UART_MCRVAL (UART_MCR_RTS)
48 #endif
49 #endif
50
51 #ifndef CONFIG_SYS_NS16550_IER
52 #define CONFIG_SYS_NS16550_IER 0x00
53 #endif /* CONFIG_SYS_NS16550_IER */
54
55 static inline void serial_out_shift(void *addr, int shift, int value)
56 {
57 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
58 outb(value, (ulong)addr);
59 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
60 out_le32(addr, value);
61 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
62 out_be32(addr, value);
63 #elif defined(CONFIG_SYS_NS16550_MEM32)
64 writel(value, addr);
65 #elif defined(CONFIG_SYS_BIG_ENDIAN)
66 writeb(value, addr + (1 << shift) - 1);
67 #else
68 writeb(value, addr);
69 #endif
70 }
71
72 static inline int serial_in_shift(void *addr, int shift)
73 {
74 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
75 return inb((ulong)addr);
76 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
77 return in_le32(addr);
78 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
79 return in_be32(addr);
80 #elif defined(CONFIG_SYS_NS16550_MEM32)
81 return readl(addr);
82 #elif defined(CONFIG_SYS_BIG_ENDIAN)
83 return readb(addr + (1 << shift) - 1);
84 #else
85 return readb(addr);
86 #endif
87 }
88
89 #ifdef CONFIG_DM_SERIAL
90
91 #ifndef CONFIG_SYS_NS16550_CLK
92 #define CONFIG_SYS_NS16550_CLK 0
93 #endif
94
95 static void ns16550_writeb(NS16550_t port, int offset, int value)
96 {
97 struct ns16550_platdata *plat = port->plat;
98 unsigned char *addr;
99
100 offset *= 1 << plat->reg_shift;
101 addr = (unsigned char *)plat->base + offset;
102
103 /*
104 * As far as we know it doesn't make sense to support selection of
105 * these options at run-time, so use the existing CONFIG options.
106 */
107 serial_out_shift(addr + plat->reg_offset, plat->reg_shift, value);
108 }
109
110 static int ns16550_readb(NS16550_t port, int offset)
111 {
112 struct ns16550_platdata *plat = port->plat;
113 unsigned char *addr;
114
115 offset *= 1 << plat->reg_shift;
116 addr = (unsigned char *)plat->base + offset;
117
118 return serial_in_shift(addr + plat->reg_offset, plat->reg_shift);
119 }
120
121 static u32 ns16550_getfcr(NS16550_t port)
122 {
123 struct ns16550_platdata *plat = port->plat;
124
125 return plat->fcr;
126 }
127
128 /* We can clean these up once everything is moved to driver model */
129 #define serial_out(value, addr) \
130 ns16550_writeb(com_port, \
131 (unsigned char *)addr - (unsigned char *)com_port, value)
132 #define serial_in(addr) \
133 ns16550_readb(com_port, \
134 (unsigned char *)addr - (unsigned char *)com_port)
135 #else
136 static u32 ns16550_getfcr(NS16550_t port)
137 {
138 return UART_FCR_DEFVAL;
139 }
140 #endif
141
142 int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
143 {
144 const unsigned int mode_x_div = 16;
145
146 return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
147 }
148
149 static void NS16550_setbrg(NS16550_t com_port, int baud_divisor)
150 {
151 serial_out(UART_LCR_BKSE | UART_LCRVAL, &com_port->lcr);
152 serial_out(baud_divisor & 0xff, &com_port->dll);
153 serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
154 serial_out(UART_LCRVAL, &com_port->lcr);
155 }
156
157 void NS16550_init(NS16550_t com_port, int baud_divisor)
158 {
159 #if (defined(CONFIG_SPL_BUILD) && \
160 (defined(CONFIG_OMAP34XX) || defined(CONFIG_OMAP44XX)))
161 /*
162 * On some OMAP3/OMAP4 devices when UART3 is configured for boot mode
163 * before SPL starts only THRE bit is set. We have to empty the
164 * transmitter before initialization starts.
165 */
166 if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE))
167 == UART_LSR_THRE) {
168 if (baud_divisor != -1)
169 NS16550_setbrg(com_port, baud_divisor);
170 serial_out(0, &com_port->mdr1);
171 }
172 #endif
173
174 while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
175 ;
176
177 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
178 #if defined(CONFIG_ARCH_OMAP2PLUS)
179 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
180 #endif
181 serial_out(UART_MCRVAL, &com_port->mcr);
182 serial_out(ns16550_getfcr(com_port), &com_port->fcr);
183 if (baud_divisor != -1)
184 NS16550_setbrg(com_port, baud_divisor);
185 #if defined(CONFIG_ARCH_OMAP2PLUS) || defined(CONFIG_SOC_DA8XX)
186 /* /16 is proper to hit 115200 with 48MHz */
187 serial_out(0, &com_port->mdr1);
188 #endif
189 #if defined(CONFIG_SOC_KEYSTONE)
190 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC);
191 #endif
192 }
193
194 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
195 void NS16550_reinit(NS16550_t com_port, int baud_divisor)
196 {
197 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
198 NS16550_setbrg(com_port, 0);
199 serial_out(UART_MCRVAL, &com_port->mcr);
200 serial_out(ns16550_getfcr(com_port), &com_port->fcr);
201 NS16550_setbrg(com_port, baud_divisor);
202 }
203 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
204
205 void NS16550_putc(NS16550_t com_port, char c)
206 {
207 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
208 ;
209 serial_out(c, &com_port->thr);
210
211 /*
212 * Call watchdog_reset() upon newline. This is done here in putc
213 * since the environment code uses a single puts() to print the complete
214 * environment upon "printenv". So we can't put this watchdog call
215 * in puts().
216 */
217 if (c == '\n')
218 WATCHDOG_RESET();
219 }
220
221 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
222 char NS16550_getc(NS16550_t com_port)
223 {
224 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
225 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
226 extern void usbtty_poll(void);
227 usbtty_poll();
228 #endif
229 WATCHDOG_RESET();
230 }
231 return serial_in(&com_port->rbr);
232 }
233
234 int NS16550_tstc(NS16550_t com_port)
235 {
236 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
237 }
238
239 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
240
241 #ifdef CONFIG_DEBUG_UART_NS16550
242
243 #include <debug_uart.h>
244
245 static inline void _debug_uart_init(void)
246 {
247 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
248 int baud_divisor;
249
250 /*
251 * We copy the code from above because it is already horribly messy.
252 * Trying to refactor to nicely remove the duplication doesn't seem
253 * feasible. The better fix is to move all users of this driver to
254 * driver model.
255 */
256 baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
257 CONFIG_BAUDRATE);
258 serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
259 serial_dout(&com_port->mcr, UART_MCRVAL);
260 serial_dout(&com_port->fcr, UART_FCR_DEFVAL);
261
262 serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
263 serial_dout(&com_port->dll, baud_divisor & 0xff);
264 serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
265 serial_dout(&com_port->lcr, UART_LCRVAL);
266 }
267
268 static inline void _debug_uart_putc(int ch)
269 {
270 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
271
272 while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
273 ;
274 serial_dout(&com_port->thr, ch);
275 }
276
277 DEBUG_UART_FUNCS
278
279 #endif
280
281 #ifdef CONFIG_DEBUG_UART_OMAP
282
283 #include <debug_uart.h>
284
285 static inline void _debug_uart_init(void)
286 {
287 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
288 int baud_divisor;
289
290 baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
291 CONFIG_BAUDRATE);
292 serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
293 serial_dout(&com_port->mdr1, 0x7);
294 serial_dout(&com_port->mcr, UART_MCRVAL);
295 serial_dout(&com_port->fcr, UART_FCR_DEFVAL);
296
297 serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
298 serial_dout(&com_port->dll, baud_divisor & 0xff);
299 serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
300 serial_dout(&com_port->lcr, UART_LCRVAL);
301 serial_dout(&com_port->mdr1, 0x0);
302 }
303
304 static inline void _debug_uart_putc(int ch)
305 {
306 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
307
308 while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
309 ;
310 serial_dout(&com_port->thr, ch);
311 }
312
313 DEBUG_UART_FUNCS
314
315 #endif
316
317 #ifdef CONFIG_DM_SERIAL
318 static int ns16550_serial_putc(struct udevice *dev, const char ch)
319 {
320 struct NS16550 *const com_port = dev_get_priv(dev);
321
322 if (!(serial_in(&com_port->lsr) & UART_LSR_THRE))
323 return -EAGAIN;
324 serial_out(ch, &com_port->thr);
325
326 /*
327 * Call watchdog_reset() upon newline. This is done here in putc
328 * since the environment code uses a single puts() to print the complete
329 * environment upon "printenv". So we can't put this watchdog call
330 * in puts().
331 */
332 if (ch == '\n')
333 WATCHDOG_RESET();
334
335 return 0;
336 }
337
338 static int ns16550_serial_pending(struct udevice *dev, bool input)
339 {
340 struct NS16550 *const com_port = dev_get_priv(dev);
341
342 if (input)
343 return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0;
344 else
345 return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1;
346 }
347
348 static int ns16550_serial_getc(struct udevice *dev)
349 {
350 struct NS16550 *const com_port = dev_get_priv(dev);
351
352 if (!(serial_in(&com_port->lsr) & UART_LSR_DR))
353 return -EAGAIN;
354
355 return serial_in(&com_port->rbr);
356 }
357
358 static int ns16550_serial_setbrg(struct udevice *dev, int baudrate)
359 {
360 struct NS16550 *const com_port = dev_get_priv(dev);
361 struct ns16550_platdata *plat = com_port->plat;
362 int clock_divisor;
363
364 clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate);
365
366 NS16550_setbrg(com_port, clock_divisor);
367
368 return 0;
369 }
370
371 int ns16550_serial_probe(struct udevice *dev)
372 {
373 struct NS16550 *const com_port = dev_get_priv(dev);
374
375 com_port->plat = dev_get_platdata(dev);
376 NS16550_init(com_port, -1);
377
378 return 0;
379 }
380
381 #if CONFIG_IS_ENABLED(OF_CONTROL)
382 enum {
383 PORT_NS16550 = 0,
384 PORT_JZ4780,
385 };
386 #endif
387
388 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
389 int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
390 {
391 struct ns16550_platdata *plat = dev->platdata;
392 const u32 port_type = dev_get_driver_data(dev);
393 fdt_addr_t addr;
394 struct clk clk;
395 int err;
396
397 /* try Processor Local Bus device first */
398 addr = devfdt_get_addr(dev);
399 #if defined(CONFIG_PCI) && defined(CONFIG_DM_PCI)
400 if (addr == FDT_ADDR_T_NONE) {
401 /* then try pci device */
402 struct fdt_pci_addr pci_addr;
403 u32 bar;
404 int ret;
405
406 /* we prefer to use a memory-mapped register */
407 ret = fdtdec_get_pci_addr(gd->fdt_blob, dev_of_offset(dev),
408 FDT_PCI_SPACE_MEM32, "reg",
409 &pci_addr);
410 if (ret) {
411 /* try if there is any i/o-mapped register */
412 ret = fdtdec_get_pci_addr(gd->fdt_blob,
413 dev_of_offset(dev),
414 FDT_PCI_SPACE_IO,
415 "reg", &pci_addr);
416 if (ret)
417 return ret;
418 }
419
420 ret = fdtdec_get_pci_bar32(dev, &pci_addr, &bar);
421 if (ret)
422 return ret;
423
424 addr = bar;
425 }
426 #endif
427
428 if (addr == FDT_ADDR_T_NONE)
429 return -EINVAL;
430
431 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
432 plat->base = addr;
433 #else
434 plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
435 #endif
436
437 plat->reg_offset = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
438 "reg-offset", 0);
439 plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
440 "reg-shift", 0);
441
442 err = clk_get_by_index(dev, 0, &clk);
443 if (!err) {
444 err = clk_get_rate(&clk);
445 if (!IS_ERR_VALUE(err))
446 plat->clock = err;
447 } else if (err != -ENOENT && err != -ENODEV && err != -ENOSYS) {
448 debug("ns16550 failed to get clock\n");
449 return err;
450 }
451
452 if (!plat->clock)
453 plat->clock = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
454 "clock-frequency",
455 CONFIG_SYS_NS16550_CLK);
456 if (!plat->clock) {
457 debug("ns16550 clock not defined\n");
458 return -EINVAL;
459 }
460
461 plat->fcr = UART_FCR_DEFVAL;
462 if (port_type == PORT_JZ4780)
463 plat->fcr |= UART_FCR_UME;
464
465 return 0;
466 }
467 #endif
468
469 const struct dm_serial_ops ns16550_serial_ops = {
470 .putc = ns16550_serial_putc,
471 .pending = ns16550_serial_pending,
472 .getc = ns16550_serial_getc,
473 .setbrg = ns16550_serial_setbrg,
474 };
475
476 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
477 /*
478 * Please consider existing compatible strings before adding a new
479 * one to keep this table compact. Or you may add a generic "ns16550"
480 * compatible string to your dts.
481 */
482 static const struct udevice_id ns16550_serial_ids[] = {
483 { .compatible = "ns16550", .data = PORT_NS16550 },
484 { .compatible = "ns16550a", .data = PORT_NS16550 },
485 { .compatible = "ingenic,jz4780-uart", .data = PORT_JZ4780 },
486 { .compatible = "nvidia,tegra20-uart", .data = PORT_NS16550 },
487 { .compatible = "snps,dw-apb-uart", .data = PORT_NS16550 },
488 { .compatible = "ti,omap2-uart", .data = PORT_NS16550 },
489 { .compatible = "ti,omap3-uart", .data = PORT_NS16550 },
490 { .compatible = "ti,omap4-uart", .data = PORT_NS16550 },
491 { .compatible = "ti,am3352-uart", .data = PORT_NS16550 },
492 { .compatible = "ti,am4372-uart", .data = PORT_NS16550 },
493 { .compatible = "ti,dra742-uart", .data = PORT_NS16550 },
494 {}
495 };
496 #endif /* OF_CONTROL && !OF_PLATDATA */
497
498 #if CONFIG_IS_ENABLED(SERIAL_PRESENT)
499
500 /* TODO(sjg@chromium.org): Integrate this into a macro like CONFIG_IS_ENABLED */
501 #if !defined(CONFIG_TPL_BUILD) || defined(CONFIG_TPL_DM_SERIAL)
502 U_BOOT_DRIVER(ns16550_serial) = {
503 .name = "ns16550_serial",
504 .id = UCLASS_SERIAL,
505 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
506 .of_match = ns16550_serial_ids,
507 .ofdata_to_platdata = ns16550_serial_ofdata_to_platdata,
508 .platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
509 #endif
510 .priv_auto_alloc_size = sizeof(struct NS16550),
511 .probe = ns16550_serial_probe,
512 .ops = &ns16550_serial_ops,
513 .flags = DM_FLAG_PRE_RELOC,
514 };
515 #endif
516 #endif /* SERIAL_PRESENT */
517
518 #endif /* CONFIG_DM_SERIAL */
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