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Sonic Zhanga12c51f2012-08-16 11:16:02 +08001/*
2 * serial.h - common serial defines for early debug and serial driver.
3 * any functions defined here must be always_inline since
4 * initcode cannot have function calls.
5 *
6 * Copyright (c) 2004-2011 Analog Devices Inc.
7 *
8 * Licensed under the GPL-2 or later.
9 */
10
11#ifndef __BFIN_CPU_SERIAL1_H__
12#define __BFIN_CPU_SERIAL1_H__
13
14#include <asm/mach-common/bits/uart.h>
15
16#ifndef __ASSEMBLY__
17
Sonic Zhang79f2b392013-02-05 19:10:34 +080018#include <asm/clock.h>
19
Sonic Zhanga12c51f2012-08-16 11:16:02 +080020#define MMR_UART(n) _PASTE_UART(n, UART, DLL)
21#ifdef UART_DLL
22# define UART0_DLL UART_DLL
23# if CONFIG_UART_CONSOLE != 0
24# error CONFIG_UART_CONSOLE must be 0 on parts with only one UART
25# endif
26#endif
27#define UART_BASE MMR_UART(CONFIG_UART_CONSOLE)
28
29#define LOB(x) ((x) & 0xFF)
30#define HIB(x) (((x) >> 8) & 0xFF)
31
32/*
33 * All Blackfin system MMRs are padded to 32bits even if the register
34 * itself is only 16bits. So use a helper macro to streamline this.
35 */
36struct bfin_mmr_serial {
37#if BFIN_UART_HW_VER == 2
38 u16 dll;
39 u16 __pad_0;
40 u16 dlh;
41 u16 __pad_1;
42 u16 gctl;
43 u16 __pad_2;
44 u16 lcr;
45 u16 __pad_3;
46 u16 mcr;
47 u16 __pad_4;
48 u16 lsr;
49 u16 __pad_5;
50 u16 msr;
51 u16 __pad_6;
52 u16 scr;
53 u16 __pad_7;
54 u16 ier_set;
55 u16 __pad_8;
56 u16 ier_clear;
57 u16 __pad_9;
58 u16 thr;
59 u16 __pad_10;
60 u16 rbr;
61 u16 __pad_11;
62#else
63 union {
64 u16 dll;
65 u16 thr;
66 const u16 rbr;
67 };
68 const u16 __spad0;
69 union {
70 u16 dlh;
71 u16 ier;
72 };
73 const u16 __spad1;
74 const u16 iir;
75 u16 __pad_0;
76 u16 lcr;
77 u16 __pad_1;
78 u16 mcr;
79 u16 __pad_2;
80 u16 lsr;
81 u16 __pad_3;
82 u16 msr;
83 u16 __pad_4;
84 u16 scr;
85 u16 __pad_5;
86 const u32 __spad2;
87 u16 gctl;
88 u16 __pad_6;
89#endif
90};
91
92#define uart_lsr_t uint32_t
93#define _lsr_read(p) bfin_read(&p->lsr)
94#define _lsr_write(p, v) bfin_write(&p->lsr, v)
95
96#if BFIN_UART_HW_VER == 2
97# define ACCESS_LATCH()
98# define ACCESS_PORT_IER()
99#else
100# define ACCESS_LATCH() bfin_write_or(&pUART->lcr, DLAB)
101# define ACCESS_PORT_IER() bfin_write_and(&pUART->lcr, ~DLAB)
102#endif
103
104__attribute__((always_inline))
105static inline void serial_early_do_mach_portmux(char port, int mux_mask,
106 int mux_func, int port_pin)
107{
108 switch (port) {
109#if defined(__ADSPBF54x__)
110 case 'B':
111 bfin_write_PORTB_MUX((bfin_read_PORTB_MUX() &
112 ~mux_mask) | mux_func);
113 bfin_write_PORTB_FER(bfin_read_PORTB_FER() | port_pin);
114 break;
115 case 'E':
116 bfin_write_PORTE_MUX((bfin_read_PORTE_MUX() &
117 ~mux_mask) | mux_func);
118 bfin_write_PORTE_FER(bfin_read_PORTE_FER() | port_pin);
119 break;
120#endif
121#if defined(__ADSPBF50x__) || defined(__ADSPBF51x__) || defined(__ADSPBF52x__)
122 case 'F':
123 bfin_write_PORTF_MUX((bfin_read_PORTF_MUX() &
124 ~mux_mask) | mux_func);
125 bfin_write_PORTF_FER(bfin_read_PORTF_FER() | port_pin);
126 break;
127 case 'G':
128 bfin_write_PORTG_MUX((bfin_read_PORTG_MUX() &
129 ~mux_mask) | mux_func);
130 bfin_write_PORTG_FER(bfin_read_PORTG_FER() | port_pin);
131 break;
132 case 'H':
133 bfin_write_PORTH_MUX((bfin_read_PORTH_MUX() &
134 ~mux_mask) | mux_func);
135 bfin_write_PORTH_FER(bfin_read_PORTH_FER() | port_pin);
136 break;
137#endif
138 default:
139 break;
140 }
141}
142
143__attribute__((always_inline))
144static inline void serial_early_do_portmux(void)
145{
146#if defined(__ADSPBF50x__)
147 switch (CONFIG_UART_CONSOLE) {
148 case 0:
149 serial_early_do_mach_portmux('G', PORT_x_MUX_7_MASK,
150 PORT_x_MUX_7_FUNC_1, PG12); /* TX: G; mux 7; func 1; PG12 */
151 serial_early_do_mach_portmux('G', PORT_x_MUX_7_MASK,
152 PORT_x_MUX_7_FUNC_1, PG13); /* RX: G; mux 7; func 1; PG13 */
153 break;
154 case 1:
155 serial_early_do_mach_portmux('F', PORT_x_MUX_3_MASK,
156 PORT_x_MUX_3_FUNC_1, PF7); /* TX: F; mux 3; func 1; PF6 */
157 serial_early_do_mach_portmux('F', PORT_x_MUX_3_MASK,
158 PORT_x_MUX_3_FUNC_1, PF6); /* RX: F; mux 3; func 1; PF7 */
159 break;
160 }
161#elif defined(__ADSPBF51x__)
162 switch (CONFIG_UART_CONSOLE) {
163 case 0:
164 serial_early_do_mach_portmux('G', PORT_x_MUX_5_MASK,
165 PORT_x_MUX_5_FUNC_2, PG9); /* TX: G; mux 5; func 2; PG9 */
166 serial_early_do_mach_portmux('G', PORT_x_MUX_5_MASK,
167 PORT_x_MUX_5_FUNC_2, PG10); /* RX: G; mux 5; func 2; PG10 */
168 break;
169 case 1:
170 serial_early_do_mach_portmux('H', PORT_x_MUX_3_MASK,
171 PORT_x_MUX_3_FUNC_2, PH7); /* TX: H; mux 3; func 2; PH6 */
172 serial_early_do_mach_portmux('H', PORT_x_MUX_3_MASK,
173 PORT_x_MUX_3_FUNC_2, PH6); /* RX: H; mux 3; func 2; PH7 */
174 break;
175 }
176#elif defined(__ADSPBF52x__)
177 switch (CONFIG_UART_CONSOLE) {
178 case 0:
179 serial_early_do_mach_portmux('G', PORT_x_MUX_2_MASK,
180 PORT_x_MUX_2_FUNC_3, PG7); /* TX: G; mux 2; func 3; PG7 */
181 serial_early_do_mach_portmux('G', PORT_x_MUX_2_MASK,
182 PORT_x_MUX_2_FUNC_3, PG8); /* RX: G; mux 2; func 3; PG8 */
183 break;
184 case 1:
185 serial_early_do_mach_portmux('F', PORT_x_MUX_5_MASK,
186 PORT_x_MUX_5_FUNC_3, PF14); /* TX: F; mux 5; func 3; PF14 */
187 serial_early_do_mach_portmux('F', PORT_x_MUX_5_MASK,
188 PORT_x_MUX_5_FUNC_3, PF15); /* RX: F; mux 5; func 3; PF15 */
189 break;
190 }
191#elif defined(__ADSPBF537__) || defined(__ADSPBF536__) || defined(__ADSPBF534__)
192 const uint16_t func[] = { PFDE, PFTE, };
193 bfin_write_PORT_MUX(bfin_read_PORT_MUX() & ~func[CONFIG_UART_CONSOLE]);
194 bfin_write_PORTF_FER(bfin_read_PORTF_FER() |
195 (1 << P_IDENT(P_UART(RX))) |
196 (1 << P_IDENT(P_UART(TX))));
197#elif defined(__ADSPBF54x__)
198 switch (CONFIG_UART_CONSOLE) {
199 case 0:
200 serial_early_do_mach_portmux('E', PORT_x_MUX_7_MASK,
201 PORT_x_MUX_7_FUNC_1, PE7); /* TX: E; mux 7; func 1; PE7 */
202 serial_early_do_mach_portmux('E', PORT_x_MUX_8_MASK,
203 PORT_x_MUX_8_FUNC_1, PE8); /* RX: E; mux 8; func 1; PE8 */
204 break;
205 case 1:
206 serial_early_do_mach_portmux('H', PORT_x_MUX_0_MASK,
207 PORT_x_MUX_0_FUNC_1, PH0); /* TX: H; mux 0; func 1; PH0 */
208 serial_early_do_mach_portmux('H', PORT_x_MUX_1_MASK,
209 PORT_x_MUX_1_FUNC_1, PH1); /* RX: H; mux 1; func 1; PH1 */
210 break;
211 case 2:
212 serial_early_do_mach_portmux('B', PORT_x_MUX_4_MASK,
213 PORT_x_MUX_4_FUNC_1, PB4); /* TX: B; mux 4; func 1; PB4 */
214 serial_early_do_mach_portmux('B', PORT_x_MUX_5_MASK,
215 PORT_x_MUX_5_FUNC_1, PB5); /* RX: B; mux 5; func 1; PB5 */
216 break;
217 case 3:
218 serial_early_do_mach_portmux('B', PORT_x_MUX_6_MASK,
219 PORT_x_MUX_6_FUNC_1, PB6); /* TX: B; mux 6; func 1; PB6 */
220 serial_early_do_mach_portmux('B', PORT_x_MUX_7_MASK,
221 PORT_x_MUX_7_FUNC_1, PB7); /* RX: B; mux 7; func 1; PB7 */
222 break;
223 }
224#elif defined(__ADSPBF561__)
225 /* UART pins could be GPIO, but they aren't pin muxed. */
226#else
227# if (P_UART(RX) & P_DEFINED) || (P_UART(TX) & P_DEFINED)
228# error "missing portmux logic for UART"
229# endif
230#endif
231 SSYNC();
232}
233
234__attribute__((always_inline))
Sonic Zhanga12c51f2012-08-16 11:16:02 +0800235static inline int uart_init(uint32_t uart_base)
236{
237 /* always enable UART -- avoids anomalies 05000309 and 05000350 */
238 bfin_write(&pUART->gctl, UCEN);
239
240 /* Set LCR to Word Lengh 8-bit word select */
241 bfin_write(&pUART->lcr, WLS_8);
242
243 SSYNC();
244
245 return 0;
246}
247
248__attribute__((always_inline))
249static inline int serial_early_init(uint32_t uart_base)
250{
251 /* handle portmux crap on different Blackfins */
252 serial_do_portmux();
253
254 return uart_init(uart_base);
255}
256
257__attribute__((always_inline))
258static inline int serial_early_uninit(uint32_t uart_base)
259{
260 /* disable the UART by clearing UCEN */
261 bfin_write(&pUART->gctl, 0);
262
263 return 0;
264}
265
266__attribute__((always_inline))
Sonic Zhang79f2b392013-02-05 19:10:34 +0800267static inline void serial_set_divisor(uint32_t uart_base, uint16_t divisor)
Sonic Zhanga12c51f2012-08-16 11:16:02 +0800268{
Sonic Zhanga12c51f2012-08-16 11:16:02 +0800269 /* Set DLAB in LCR to Access DLL and DLH */
270 ACCESS_LATCH();
271 SSYNC();
272
273 /* Program the divisor to get the baud rate we want */
274 bfin_write(&pUART->dll, LOB(divisor));
275 bfin_write(&pUART->dlh, HIB(divisor));
276 SSYNC();
277
278 /* Clear DLAB in LCR to Access THR RBR IER */
279 ACCESS_PORT_IER();
280 SSYNC();
281}
282
283__attribute__((always_inline))
Sonic Zhang79f2b392013-02-05 19:10:34 +0800284static inline void serial_early_set_baud(uint32_t uart_base, uint32_t baud)
285{
286 /* Translate from baud into divisor in terms of SCLK. The
287 * weird multiplication is to make sure we over sample just
288 * a little rather than under sample the incoming signals.
289 */
Sonic Zhangab80b652012-11-30 17:39:32 +0800290#if CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS
291 uint16_t divisor = (early_get_uart_clk() + baud * 8) / (baud * 16)
292 - ANOMALY_05000230;
293#else
Sonic Zhang79f2b392013-02-05 19:10:34 +0800294 uint16_t divisor = early_division(early_get_uart_clk() + (baud * 8),
295 baud * 16) - ANOMALY_05000230;
Sonic Zhangab80b652012-11-30 17:39:32 +0800296#endif
Sonic Zhang79f2b392013-02-05 19:10:34 +0800297
298 serial_set_divisor(uart_base, divisor);
299}
300
301__attribute__((always_inline))
Sonic Zhanga12c51f2012-08-16 11:16:02 +0800302static inline void serial_early_put_div(uint16_t divisor)
303{
304 uint32_t uart_base = UART_BASE;
305
306 /* Set DLAB in LCR to Access DLL and DLH */
307 ACCESS_LATCH();
308 SSYNC();
309
310 /* Program the divisor to get the baud rate we want */
311 bfin_write(&pUART->dll, LOB(divisor));
312 bfin_write(&pUART->dlh, HIB(divisor));
313 SSYNC();
314
315 /* Clear DLAB in LCR to Access THR RBR IER */
316 ACCESS_PORT_IER();
317 SSYNC();
318}
319
320__attribute__((always_inline))
321static inline uint16_t serial_early_get_div(void)
322{
323 uint32_t uart_base = UART_BASE;
324
325 /* Set DLAB in LCR to Access DLL and DLH */
326 ACCESS_LATCH();
327 SSYNC();
328
329 uint8_t dll = bfin_read(&pUART->dll);
330 uint8_t dlh = bfin_read(&pUART->dlh);
331 uint16_t divisor = (dlh << 8) | dll;
332
333 /* Clear DLAB in LCR to Access THR RBR IER */
334 ACCESS_PORT_IER();
335 SSYNC();
336
337 return divisor;
338}
339
340#endif
341
342#endif