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Merge branch 'master' of git://git.denx.de/u-boot-socfpga
[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_OMAP) || defined(CONFIG_AM33XX) || \
179 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
180 serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
181 #endif
182 serial_out(UART_MCRVAL, &com_port->mcr);
183 serial_out(ns16550_getfcr(com_port), &com_port->fcr);
184 if (baud_divisor != -1)
185 NS16550_setbrg(com_port, baud_divisor);
186 #if defined(CONFIG_OMAP) || \
187 defined(CONFIG_AM33XX) || defined(CONFIG_SOC_DA8XX) || \
188 defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX)
189
190 /* /16 is proper to hit 115200 with 48MHz */
191 serial_out(0, &com_port->mdr1);
192 #endif /* CONFIG_OMAP */
193 #if defined(CONFIG_SOC_KEYSTONE)
194 serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->regC);
195 #endif
196 }
197
198 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
199 void NS16550_reinit(NS16550_t com_port, int baud_divisor)
200 {
201 serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
202 NS16550_setbrg(com_port, 0);
203 serial_out(UART_MCRVAL, &com_port->mcr);
204 serial_out(ns16550_getfcr(com_port), &com_port->fcr);
205 NS16550_setbrg(com_port, baud_divisor);
206 }
207 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
208
209 void NS16550_putc(NS16550_t com_port, char c)
210 {
211 while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
212 ;
213 serial_out(c, &com_port->thr);
214
215 /*
216 * Call watchdog_reset() upon newline. This is done here in putc
217 * since the environment code uses a single puts() to print the complete
218 * environment upon "printenv". So we can't put this watchdog call
219 * in puts().
220 */
221 if (c == '\n')
222 WATCHDOG_RESET();
223 }
224
225 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
226 char NS16550_getc(NS16550_t com_port)
227 {
228 while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
229 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
230 extern void usbtty_poll(void);
231 usbtty_poll();
232 #endif
233 WATCHDOG_RESET();
234 }
235 return serial_in(&com_port->rbr);
236 }
237
238 int NS16550_tstc(NS16550_t com_port)
239 {
240 return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
241 }
242
243 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
244
245 #ifdef CONFIG_DEBUG_UART_NS16550
246
247 #include <debug_uart.h>
248
249 #define serial_dout(reg, value) \
250 serial_out_shift((char *)com_port + \
251 ((char *)reg - (char *)com_port) * \
252 (1 << CONFIG_DEBUG_UART_SHIFT), \
253 CONFIG_DEBUG_UART_SHIFT, value)
254 #define serial_din(reg) \
255 serial_in_shift((char *)com_port + \
256 ((char *)reg - (char *)com_port) * \
257 (1 << CONFIG_DEBUG_UART_SHIFT), \
258 CONFIG_DEBUG_UART_SHIFT)
259
260 static inline void _debug_uart_init(void)
261 {
262 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
263 int baud_divisor;
264
265 /*
266 * We copy the code from above because it is already horribly messy.
267 * Trying to refactor to nicely remove the duplication doesn't seem
268 * feasible. The better fix is to move all users of this driver to
269 * driver model.
270 */
271 baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
272 CONFIG_BAUDRATE);
273 serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
274 serial_dout(&com_port->mcr, UART_MCRVAL);
275 serial_dout(&com_port->fcr, UART_FCR_DEFVAL);
276
277 serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
278 serial_dout(&com_port->dll, baud_divisor & 0xff);
279 serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
280 serial_dout(&com_port->lcr, UART_LCRVAL);
281 }
282
283 static inline void _debug_uart_putc(int ch)
284 {
285 struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
286
287 while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
288 ;
289 serial_dout(&com_port->thr, ch);
290 }
291
292 DEBUG_UART_FUNCS
293
294 #endif
295
296 #ifdef CONFIG_DM_SERIAL
297 static int ns16550_serial_putc(struct udevice *dev, const char ch)
298 {
299 struct NS16550 *const com_port = dev_get_priv(dev);
300
301 if (!(serial_in(&com_port->lsr) & UART_LSR_THRE))
302 return -EAGAIN;
303 serial_out(ch, &com_port->thr);
304
305 /*
306 * Call watchdog_reset() upon newline. This is done here in putc
307 * since the environment code uses a single puts() to print the complete
308 * environment upon "printenv". So we can't put this watchdog call
309 * in puts().
310 */
311 if (ch == '\n')
312 WATCHDOG_RESET();
313
314 return 0;
315 }
316
317 static int ns16550_serial_pending(struct udevice *dev, bool input)
318 {
319 struct NS16550 *const com_port = dev_get_priv(dev);
320
321 if (input)
322 return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0;
323 else
324 return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1;
325 }
326
327 static int ns16550_serial_getc(struct udevice *dev)
328 {
329 struct NS16550 *const com_port = dev_get_priv(dev);
330
331 if (!(serial_in(&com_port->lsr) & UART_LSR_DR))
332 return -EAGAIN;
333
334 return serial_in(&com_port->rbr);
335 }
336
337 static int ns16550_serial_setbrg(struct udevice *dev, int baudrate)
338 {
339 struct NS16550 *const com_port = dev_get_priv(dev);
340 struct ns16550_platdata *plat = com_port->plat;
341 int clock_divisor;
342
343 clock_divisor = ns16550_calc_divisor(com_port, plat->clock, baudrate);
344
345 NS16550_setbrg(com_port, clock_divisor);
346
347 return 0;
348 }
349
350 int ns16550_serial_probe(struct udevice *dev)
351 {
352 struct NS16550 *const com_port = dev_get_priv(dev);
353
354 com_port->plat = dev_get_platdata(dev);
355 NS16550_init(com_port, -1);
356
357 return 0;
358 }
359
360 #if CONFIG_IS_ENABLED(OF_CONTROL)
361 enum {
362 PORT_NS16550 = 0,
363 PORT_JZ4780,
364 };
365 #endif
366
367 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
368 int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
369 {
370 struct ns16550_platdata *plat = dev->platdata;
371 const u32 port_type = dev_get_driver_data(dev);
372 fdt_addr_t addr;
373 struct clk clk;
374 int err;
375
376 /* try Processor Local Bus device first */
377 addr = dev_get_addr(dev);
378 #if defined(CONFIG_PCI) && defined(CONFIG_DM_PCI)
379 if (addr == FDT_ADDR_T_NONE) {
380 /* then try pci device */
381 struct fdt_pci_addr pci_addr;
382 u32 bar;
383 int ret;
384
385 /* we prefer to use a memory-mapped register */
386 ret = fdtdec_get_pci_addr(gd->fdt_blob, dev_of_offset(dev),
387 FDT_PCI_SPACE_MEM32, "reg",
388 &pci_addr);
389 if (ret) {
390 /* try if there is any i/o-mapped register */
391 ret = fdtdec_get_pci_addr(gd->fdt_blob,
392 dev_of_offset(dev),
393 FDT_PCI_SPACE_IO,
394 "reg", &pci_addr);
395 if (ret)
396 return ret;
397 }
398
399 ret = fdtdec_get_pci_bar32(dev, &pci_addr, &bar);
400 if (ret)
401 return ret;
402
403 addr = bar;
404 }
405 #endif
406
407 if (addr == FDT_ADDR_T_NONE)
408 return -EINVAL;
409
410 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
411 plat->base = addr;
412 #else
413 plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
414 #endif
415
416 plat->reg_offset = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
417 "reg-offset", 0);
418 plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
419 "reg-shift", 0);
420
421 err = clk_get_by_index(dev, 0, &clk);
422 if (!err) {
423 err = clk_get_rate(&clk);
424 if (!IS_ERR_VALUE(err))
425 plat->clock = err;
426 } else if (err != -ENOENT && err != -ENODEV && err != -ENOSYS) {
427 debug("ns16550 failed to get clock\n");
428 return err;
429 }
430
431 if (!plat->clock)
432 plat->clock = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
433 "clock-frequency",
434 CONFIG_SYS_NS16550_CLK);
435 if (!plat->clock) {
436 debug("ns16550 clock not defined\n");
437 return -EINVAL;
438 }
439
440 plat->fcr = UART_FCR_DEFVAL;
441 if (port_type == PORT_JZ4780)
442 plat->fcr |= UART_FCR_UME;
443
444 return 0;
445 }
446 #endif
447
448 const struct dm_serial_ops ns16550_serial_ops = {
449 .putc = ns16550_serial_putc,
450 .pending = ns16550_serial_pending,
451 .getc = ns16550_serial_getc,
452 .setbrg = ns16550_serial_setbrg,
453 };
454
455 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
456 #if CONFIG_IS_ENABLED(OF_CONTROL)
457 /*
458 * Please consider existing compatible strings before adding a new
459 * one to keep this table compact. Or you may add a generic "ns16550"
460 * compatible string to your dts.
461 */
462 static const struct udevice_id ns16550_serial_ids[] = {
463 { .compatible = "ns16550", .data = PORT_NS16550 },
464 { .compatible = "ns16550a", .data = PORT_NS16550 },
465 { .compatible = "ingenic,jz4780-uart", .data = PORT_JZ4780 },
466 { .compatible = "nvidia,tegra20-uart", .data = PORT_NS16550 },
467 { .compatible = "snps,dw-apb-uart", .data = PORT_NS16550 },
468 { .compatible = "ti,omap2-uart", .data = PORT_NS16550 },
469 { .compatible = "ti,omap3-uart", .data = PORT_NS16550 },
470 { .compatible = "ti,omap4-uart", .data = PORT_NS16550 },
471 { .compatible = "ti,am3352-uart", .data = PORT_NS16550 },
472 { .compatible = "ti,am4372-uart", .data = PORT_NS16550 },
473 { .compatible = "ti,dra742-uart", .data = PORT_NS16550 },
474 {}
475 };
476 #endif
477
478 #if CONFIG_IS_ENABLED(SERIAL_PRESENT)
479 U_BOOT_DRIVER(ns16550_serial) = {
480 .name = "ns16550_serial",
481 .id = UCLASS_SERIAL,
482 #if CONFIG_IS_ENABLED(OF_CONTROL)
483 .of_match = ns16550_serial_ids,
484 .ofdata_to_platdata = ns16550_serial_ofdata_to_platdata,
485 .platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
486 #endif
487 .priv_auto_alloc_size = sizeof(struct NS16550),
488 .probe = ns16550_serial_probe,
489 .ops = &ns16550_serial_ops,
490 .flags = DM_FLAG_PRE_RELOC,
491 };
492 #endif
493 #endif /* !OF_PLATDATA */
494 #endif /* CONFIG_DM_SERIAL */
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