source: SVN/rincon/u-boot/cpu/blackfin/serial.h @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 22 months ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 7.2 KB
Line 
1/*
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) 2004-2007 Analog Devices Inc.
7 *
8 * Licensed under the GPL-2 or later.
9 */
10
11#ifndef __BFIN_CPU_SERIAL_H__
12#define __BFIN_CPU_SERIAL_H__
13
14#include <asm/blackfin.h>
15#include <asm/mach-common/bits/uart.h>
16
17#ifdef CONFIG_DEBUG_EARLY_SERIAL
18# define BFIN_DEBUG_EARLY_SERIAL 1
19#else
20# define BFIN_DEBUG_EARLY_SERIAL 0
21#endif
22
23#define LOB(x) ((x) & 0xFF)
24#define HIB(x) (((x) >> 8) & 0xFF)
25
26#ifndef UART_LSR
27# if (CONFIG_UART_CONSOLE == 3)
28#  define pUART_DLH  pUART3_DLH
29#  define pUART_DLL  pUART3_DLL
30#  define pUART_GCTL pUART3_GCTL
31#  define pUART_IER  pUART3_IER
32#  define pUART_IERC pUART3_IER_CLEAR
33#  define pUART_LCR  pUART3_LCR
34#  define pUART_LSR  pUART3_LSR
35#  define pUART_RBR  pUART3_RBR
36#  define pUART_THR  pUART3_THR
37#  define  UART_THR   UART3_THR
38#  define  UART_LSR   UART3_LSR
39# elif (CONFIG_UART_CONSOLE == 2)
40#  define pUART_DLH  pUART2_DLH
41#  define pUART_DLL  pUART2_DLL
42#  define pUART_GCTL pUART2_GCTL
43#  define pUART_IER  pUART2_IER
44#  define pUART_IERC pUART2_IER_CLEAR
45#  define pUART_LCR  pUART2_LCR
46#  define pUART_LSR  pUART2_LSR
47#  define pUART_RBR  pUART2_RBR
48#  define pUART_THR  pUART2_THR
49#  define  UART_THR   UART2_THR
50#  define  UART_LSR   UART2_LSR
51# elif (CONFIG_UART_CONSOLE == 1)
52#  define pUART_DLH  pUART1_DLH
53#  define pUART_DLL  pUART1_DLL
54#  define pUART_GCTL pUART1_GCTL
55#  define pUART_IER  pUART1_IER
56#  define pUART_IERC pUART1_IER_CLEAR
57#  define pUART_LCR  pUART1_LCR
58#  define pUART_LSR  pUART1_LSR
59#  define pUART_RBR  pUART1_RBR
60#  define pUART_THR  pUART1_THR
61#  define  UART_THR   UART1_THR
62#  define  UART_LSR   UART1_LSR
63# elif (CONFIG_UART_CONSOLE == 0)
64#  define pUART_DLH  pUART0_DLH
65#  define pUART_DLL  pUART0_DLL
66#  define pUART_GCTL pUART0_GCTL
67#  define pUART_IER  pUART0_IER
68#  define pUART_IERC pUART0_IER_CLEAR
69#  define pUART_LCR  pUART0_LCR
70#  define pUART_LSR  pUART0_LSR
71#  define pUART_RBR  pUART0_RBR
72#  define pUART_THR  pUART0_THR
73#  define  UART_THR   UART0_THR
74#  define  UART_LSR   UART0_LSR
75# endif
76#endif
77
78#ifndef __ASSEMBLY__
79
80/* We cannot use get_sclk() in initcode as it is defined elsewhere. */
81#ifdef BFIN_IN_INITCODE
82# define get_sclk() (CONFIG_CLKIN_HZ * CONFIG_VCO_MULT / CONFIG_SCLK_DIV)
83#endif
84
85#ifdef __ADSPBF54x__
86# define ACCESS_LATCH()
87# define ACCESS_PORT_IER()
88# define CLEAR_IER()       (*pUART_IERC = 0)
89#else
90# define ACCESS_LATCH()    (*pUART_LCR |= DLAB)
91# define ACCESS_PORT_IER() (*pUART_LCR &= ~DLAB)
92# define CLEAR_IER()       (*pUART_IER = 0)
93#endif
94
95__attribute__((always_inline))
96static inline void serial_do_portmux(void)
97{
98#ifdef __ADSPBF52x__
99# define DO_MUX(port, mux, tx, rx) \
100        bfin_write_PORT##port##_MUX((bfin_read_PORT##port##_MUX() & ~PORT_x_MUX_##mux##_MASK) | PORT_x_MUX_##mux##_FUNC_3); \
101        bfin_write_PORT##port##_FER(bfin_read_PORT##port##_FER() | P##port##tx | P##port##rx);
102        switch (CONFIG_UART_CONSOLE) {
103        case 0: DO_MUX(G, 2, 7, 8);   break;    /* Port G; mux 2; PG2 and PG8 */
104        case 1: DO_MUX(F, 5, 14, 15); break;    /* Port F; mux 5; PF14 and PF15 */
105        }
106        SSYNC();
107#elif defined(__ADSPBF537__) || defined(__ADSPBF536__) || defined(__ADSPBF534__)
108# define DO_MUX(func, tx, rx) \
109        bfin_write_PORT_MUX(bfin_read_PORT_MUX() & ~(func)); \
110        bfin_write_PORTF_FER(bfin_read_PORTF_FER() | PF##tx | PF##rx);
111        switch (CONFIG_UART_CONSOLE) {
112        case 0: DO_MUX(PFDE, 0, 1); break;
113        case 1: DO_MUX(PFTE, 2, 3); break;
114        }
115        SSYNC();
116#elif defined(__ADSPBF54x__)
117# define DO_MUX(port, tx, rx) \
118        bfin_write_PORT##port##_MUX((bfin_read_PORT##port##_MUX() & ~(PORT_x_MUX_##tx##_MASK | PORT_x_MUX_##rx##_MASK)) | PORT_x_MUX_##tx##_FUNC_1 | PORT_x_MUX_##rx##_FUNC_1); \
119        bfin_write_PORT##port##_FER(bfin_read_PORT##port##_FER() | P##port##tx | P##port##rx);
120        switch (CONFIG_UART_CONSOLE) {
121        case 0: DO_MUX(E, 7, 8); break; /* Port E; PE7 and PE8 */
122        case 1: DO_MUX(H, 0, 1); break; /* Port H; PH0 and PH1 */
123        case 2: DO_MUX(B, 4, 5); break; /* Port B; PB4 and PB5 */
124        case 3: DO_MUX(B, 6, 7); break; /* Port B; PB6 and PB7 */
125        }
126        SSYNC();
127#endif
128}
129
130__attribute__((always_inline))
131static inline void serial_early_init(void)
132{
133        /* handle portmux crap on different Blackfins */
134        serial_do_portmux();
135
136        /* Enable UART */
137        *pUART_GCTL = UCEN;
138
139        /* Set LCR to Word Lengh 8-bit word select */
140        *pUART_LCR = WLS_8;
141
142        SSYNC();
143}
144
145__attribute__((always_inline))
146static inline uint32_t serial_early_get_baud(void)
147{
148        /* If the UART isnt enabled, then we are booting an LDR
149         * from a non-UART source (so like flash) which means
150         * the baud rate here is meaningless.
151         */
152        if ((*pUART_GCTL & UCEN) != UCEN)
153                return 0;
154
155#if (0) /* See comment for serial_reset_baud() in initcode.c */
156        /* Set DLAB in LCR to Access DLL and DLH */
157        ACCESS_LATCH();
158        SSYNC();
159
160        uint8_t dll = *pUART_DLL;
161        uint8_t dlh = *pUART_DLH;
162        uint16_t divisor = (dlh << 8) | dll;
163        uint32_t baud = get_sclk() / (divisor * 16);
164
165        /* Clear DLAB in LCR to Access THR RBR IER */
166        ACCESS_PORT_IER();
167        SSYNC();
168
169        return baud;
170#else
171        return CONFIG_BAUDRATE;
172#endif
173}
174
175__attribute__((always_inline))
176static inline void serial_early_set_baud(uint32_t baud)
177{
178        /* Translate from baud into divisor in terms of SCLK.
179         * The +1 is to make sure we over sample just a little
180         * rather than under sample the incoming signals.
181         */
182        uint16_t divisor = (get_sclk() / (baud * 16)) + 1;
183
184        /* Set DLAB in LCR to Access DLL and DLH */
185        ACCESS_LATCH();
186        SSYNC();
187
188        /* Program the divisor to get the baud rate we want */
189        *pUART_DLL = LOB(divisor);
190        *pUART_DLH = HIB(divisor);
191        SSYNC();
192
193        /* Clear DLAB in LCR to Access THR RBR IER */
194        ACCESS_PORT_IER();
195        SSYNC();
196}
197
198#ifndef BFIN_IN_INITCODE
199__attribute__((always_inline))
200static inline void serial_early_puts(const char *s)
201{
202        if (BFIN_DEBUG_EARLY_SERIAL) {
203                serial_puts("Early: ");
204                serial_puts(s);
205        }
206}
207#endif
208
209#else
210
211.macro serial_early_init
212#ifdef CONFIG_DEBUG_EARLY_SERIAL
213        call _serial_initialize;
214#endif
215.endm
216
217.macro serial_early_set_baud
218#ifdef CONFIG_DEBUG_EARLY_SERIAL
219        R0.L = LO(CONFIG_BAUDRATE);
220        R0.H = HI(CONFIG_BAUDRATE);
221        call _serial_set_baud;
222#endif
223.endm
224
225/* Recursively expand calls to _serial_putc for every byte
226 * passed to us.  Append a newline when we're all done.
227 */
228.macro _serial_early_putc byte:req morebytes:vararg
229#ifdef CONFIG_DEBUG_EARLY_SERIAL
230        R0 = \byte;
231        call _serial_putc;
232.ifnb \morebytes
233        _serial_early_putc \morebytes
234.else
235.if (\byte != '\n')
236        _serial_early_putc '\n'
237.endif
238.endif
239#endif
240.endm
241
242/* Wrapper around recurisve _serial_early_putc macro which
243 * simply prepends the string "Early: "
244 */
245.macro serial_early_putc byte:req morebytes:vararg
246#ifdef CONFIG_DEBUG_EARLY_SERIAL
247        _serial_early_putc 'E', 'a', 'r', 'l', 'y', ':', ' ', \byte, \morebytes
248#endif
249.endm
250
251/* Since we embed the string right into our .text section, we need
252 * to find its address.  We do this by getting our PC and adding 2
253 * bytes (which is the length of the jump instruction).  Then we
254 * pass this address to serial_puts().
255 */
256#ifdef CONFIG_DEBUG_EARLY_SERIAL
257# define serial_early_puts(str) \
258        call _get_pc; \
259        jump 1f; \
260        .ascii "Early:"; \
261        .ascii __FILE__; \
262        .ascii ": "; \
263        .ascii str; \
264        .asciz "\n"; \
265        .align 4; \
2661: \
267        R0 += 2; \
268        call _serial_puts;
269#else
270# define serial_early_puts(str)
271#endif
272
273#endif
274
275#endif
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