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fsl_i2c: Added a callpoint for i2c_board_late_init
[glsdk/glsdk-u-boot.git] / arch / ppc / cpu / ppc4xx / iop480_uart.c
1 /*
2  * (C) Copyright 2000-2006
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
24 #include <common.h>
25 #include <commproc.h>
26 #include <asm/processor.h>
27 #include <asm/io.h>
28 #include <watchdog.h>
30 #ifdef CONFIG_SERIAL_MULTI
31 #include <serial.h>
32 #endif
34 DECLARE_GLOBAL_DATA_PTR;
36 #ifdef CONFIG_IOP480
38 #define SPU_BASE         0x40000000
40 #define spu_LineStat_rc  0x00   /* Line Status Register (Read/Clear) */
41 #define spu_LineStat_w   0x04   /* Line Status Register (Set) */
42 #define spu_Handshk_rc   0x08   /* Handshake Status Register (Read/Clear) */
43 #define spu_Handshk_w    0x0c   /* Handshake Status Register (Set) */
44 #define spu_BRateDivh    0x10   /* Baud rate divisor high */
45 #define spu_BRateDivl    0x14   /* Baud rate divisor low */
46 #define spu_CtlReg       0x18   /* Control Register */
47 #define spu_RxCmd        0x1c   /* Rx Command Register */
48 #define spu_TxCmd        0x20   /* Tx Command Register */
49 #define spu_RxBuff       0x24   /* Rx data buffer */
50 #define spu_TxBuff       0x24   /* Tx data buffer */
52 /*-----------------------------------------------------------------------------+
53   | Line Status Register.
54   +-----------------------------------------------------------------------------*/
55 #define asyncLSRport1           0x40000000
56 #define asyncLSRport1set        0x40000004
57 #define asyncLSRDataReady             0x80
58 #define asyncLSRFramingError          0x40
59 #define asyncLSROverrunError          0x20
60 #define asyncLSRParityError           0x10
61 #define asyncLSRBreakInterrupt        0x08
62 #define asyncLSRTxHoldEmpty           0x04
63 #define asyncLSRTxShiftEmpty          0x02
65 /*-----------------------------------------------------------------------------+
66   | Handshake Status Register.
67   +-----------------------------------------------------------------------------*/
68 #define asyncHSRport1           0x40000008
69 #define asyncHSRport1set        0x4000000c
70 #define asyncHSRDsr                   0x80
71 #define asyncLSRCts                   0x40
73 /*-----------------------------------------------------------------------------+
74   | Control Register.
75   +-----------------------------------------------------------------------------*/
76 #define asyncCRport1            0x40000018
77 #define asyncCRNormal                 0x00
78 #define asyncCRLoopback               0x40
79 #define asyncCRAutoEcho               0x80
80 #define asyncCRDtr                    0x20
81 #define asyncCRRts                    0x10
82 #define asyncCRWordLength7            0x00
83 #define asyncCRWordLength8            0x08
84 #define asyncCRParityDisable          0x00
85 #define asyncCRParityEnable           0x04
86 #define asyncCREvenParity             0x00
87 #define asyncCROddParity              0x02
88 #define asyncCRStopBitsOne            0x00
89 #define asyncCRStopBitsTwo            0x01
90 #define asyncCRDisableDtrRts          0x00
92 /*-----------------------------------------------------------------------------+
93   | Receiver Command Register.
94   +-----------------------------------------------------------------------------*/
95 #define asyncRCRport1           0x4000001c
96 #define asyncRCRDisable               0x00
97 #define asyncRCREnable                0x80
98 #define asyncRCRIntDisable            0x00
99 #define asyncRCRIntEnabled            0x20
100 #define asyncRCRDMACh2                0x40
101 #define asyncRCRDMACh3                0x60
102 #define asyncRCRErrorInt              0x10
103 #define asyncRCRPauseEnable           0x08
105 /*-----------------------------------------------------------------------------+
106   | Transmitter Command Register.
107   +-----------------------------------------------------------------------------*/
108 #define asyncTCRport1           0x40000020
109 #define asyncTCRDisable               0x00
110 #define asyncTCREnable                0x80
111 #define asyncTCRIntDisable            0x00
112 #define asyncTCRIntEnabled            0x20
113 #define asyncTCRDMACh2                0x40
114 #define asyncTCRDMACh3                0x60
115 #define asyncTCRTxEmpty               0x10
116 #define asyncTCRErrorInt              0x08
117 #define asyncTCRStopPause             0x04
118 #define asyncTCRBreakGen              0x02
120 /*-----------------------------------------------------------------------------+
121   | Miscellanies defines.
122   +-----------------------------------------------------------------------------*/
123 #define asyncTxBufferport1      0x40000024
124 #define asyncRxBufferport1      0x40000024
125 #define asyncDLABLsbport1       0x40000014
126 #define asyncDLABMsbport1       0x40000010
127 #define asyncXOFFchar                 0x13
128 #define asyncXONchar                  0x11
130 /*
131  * Minimal serial functions needed to use one of the SMC ports
132  * as serial console interface.
133  */
135 int serial_init (void)
137         volatile char val;
138         unsigned short br_reg;
140         br_reg = ((((CONFIG_CPUCLOCK * 1000000) / 16) / gd->baudrate) - 1);
142         /*
143          * Init onboard UART
144          */
145         out_8((u8 *)SPU_BASE + spu_LineStat_rc, 0x78); /* Clear all bits in Line Status Reg */
146         out_8((u8 *)SPU_BASE + spu_BRateDivl, (br_reg & 0x00ff)); /* Set baud rate divisor... */
147         out_8((u8 *)SPU_BASE + spu_BRateDivh, ((br_reg & 0xff00) >> 8)); /* ... */
148         out_8((u8 *)SPU_BASE + spu_CtlReg, 0x08);       /* Set 8 bits, no parity and 1 stop bit */
149         out_8((u8 *)SPU_BASE + spu_RxCmd, 0xb0);        /* Enable Rx */
150         out_8((u8 *)SPU_BASE + spu_TxCmd, 0x9c);        /* Enable Tx */
151         out_8((u8 *)SPU_BASE + spu_Handshk_rc, 0xff);   /* Clear Handshake */
152         val = in_8((u8 *)SPU_BASE + spu_RxBuff);        /* Dummy read, to clear receiver */
154         return (0);
157 void serial_setbrg (void)
159         unsigned short br_reg;
161         br_reg = ((((CONFIG_CPUCLOCK * 1000000) / 16) / gd->baudrate) - 1);
163         out_8((u8 *)SPU_BASE + spu_BRateDivl,
164               (br_reg & 0x00ff)); /* Set baud rate divisor... */
165         out_8((u8 *)SPU_BASE + spu_BRateDivh,
166               ((br_reg & 0xff00) >> 8)); /* ... */
169 void serial_putc (const char c)
171         if (c == '\n')
172                 serial_putc ('\r');
174         /* load status from handshake register */
175         if (in_8((u8 *)SPU_BASE + spu_Handshk_rc) != 00)
176                 out_8((u8 *)SPU_BASE + spu_Handshk_rc, 0xff);   /* Clear Handshake */
178         out_8((u8 *)SPU_BASE + spu_TxBuff, c);  /* Put char */
180         while ((in_8((u8 *)SPU_BASE + spu_LineStat_rc) & 04) != 04) {
181                 if (in_8((u8 *)SPU_BASE + spu_Handshk_rc) != 00)
182                         out_8((u8 *)SPU_BASE + spu_Handshk_rc, 0xff);   /* Clear Handshake */
183         }
186 void serial_puts (const char *s)
188         while (*s) {
189                 serial_putc (*s++);
190         }
193 int serial_getc ()
195         unsigned char status = 0;
197         while (1) {
198                 status = in_8((u8 *)asyncLSRport1);
199                 if ((status & asyncLSRDataReady) != 0x0) {
200                         break;
201                 }
202                 if ((status & ( asyncLSRFramingError |
203                                 asyncLSROverrunError |
204                                 asyncLSRParityError  |
205                                 asyncLSRBreakInterrupt )) != 0) {
206                         (void) out_8((u8 *)asyncLSRport1,
207                                      asyncLSRFramingError |
208                                      asyncLSROverrunError |
209                                      asyncLSRParityError  |
210                                      asyncLSRBreakInterrupt );
211                 }
212         }
213         return (0x000000ff & (int) in_8((u8 *)asyncRxBufferport1));
216 int serial_tstc ()
218         unsigned char status;
220         status = in_8((u8 *)asyncLSRport1);
221         if ((status & asyncLSRDataReady) != 0x0) {
222                 return (1);
223         }
224         if ((status & ( asyncLSRFramingError |
225                         asyncLSROverrunError |
226                         asyncLSRParityError  |
227                         asyncLSRBreakInterrupt )) != 0) {
228                 (void) out_8((u8 *)asyncLSRport1,
229                              asyncLSRFramingError |
230                              asyncLSROverrunError |
231                              asyncLSRParityError  |
232                              asyncLSRBreakInterrupt);
233         }
234         return 0;
237 #endif  /* CONFIG_IOP480 */