3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * Infineon Technologies AG, http://www.infineon.com
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #include <asm/addrspace.h>
33 #define SET_BIT(reg, mask) asc_writel(reg, asc_readl(reg) | (mask))
34 #define CLEAR_BIT(reg, mask) asc_writel(reg, asc_readl(reg) & (~mask))
35 #define SET_BITFIELD(reg, mask, off, val) asc_writel(reg, (asc_readl(reg) & (~mask)) | (val << off) )
39 #define DEBUG_ASC_RAW_RX_BUF 0xA0800000
40 #define DEBUG_ASC_RAW_TX_BUF 0xA0900000
43 DECLARE_GLOBAL_DATA_PTR
;
45 static IfxAsc_t
*pAsc
= (IfxAsc_t
*)CKSEG1ADDR(CONFIG_SYS_IFX_ASC_BASE
);
49 * BaudRate = ----- * --------------------
50 * 512 16 * (ReloadValue+1)
55 * ReloadValue = ( ----- * --------------- ) - 1
58 static void serial_divs(u32 baudrate
, u32 fasc
, u32
*pfdv
, u32
*preload
)
60 u32 clock
= fasc
/ 16;
62 u32 fdv
; /* best fdv */
63 u32 reload
= 0; /* best reload */
64 u32 diff
; /* smallest diff */
65 u32 idiff
; /* current diff */
66 u32 ireload
; /* current reload */
67 u32 i
; /* current fdv */
68 u32 result
; /* current resulting baudrate */
75 fdv
= 512; /* start with 1:1 fraction */
76 diff
= baudrate
; /* highest possible */
78 /* i is the test fdv value -- start with the largest possible */
79 for (i
= 512; i
> 0; i
--)
81 ireload
= (clock
* i
) / baudrate
;
83 break; /* already invalid */
84 result
= (clock
* i
) / ireload
;
86 idiff
= (result
> baudrate
) ? (result
- baudrate
) : (baudrate
- result
);
91 break; /* can't do better */
93 else if (idiff
< diff
)
95 fdv
= i
; /* best so far */
97 diff
= idiff
; /* update lowest diff*/
101 *pfdv
= (fdv
== 512) ? 0 : fdv
;
102 *preload
= reload
- 1;
106 void serial_setbrg (void)
108 u32 ReloadValue
, fdv
;
110 serial_divs(gd
->baudrate
, get_bus_freq(0), &fdv
, &ReloadValue
);
112 /* Disable Baud Rate Generator; BG should only be written when R=0 */
113 CLEAR_BIT(asc_con
, ASCCON_R
);
115 /* Enable Fractional Divider */
116 SET_BIT(asc_con
, ASCCON_FDE
); /* FDE = 1 */
118 /* Set fractional divider value */
119 asc_writel(asc_fdv
, fdv
& ASCFDV_VALUE_MASK
);
121 /* Set reload value in BG */
122 asc_writel(asc_bg
, ReloadValue
);
124 /* Enable Baud Rate Generator */
125 SET_BIT(asc_con
, ASCCON_R
); /* R = 1 */
129 int serial_init (void)
132 /* and we have to set CLC register*/
133 CLEAR_BIT(asc_clc
, ASCCLC_DISS
);
134 SET_BITFIELD(asc_clc
, ASCCLC_RMCMASK
, ASCCLC_RMCOFFSET
, 0x0001);
136 /* initialy we are in async mode */
137 asc_writel(asc_con
, ASCCON_M_8ASYNC
);
139 /* select input port */
140 asc_writel(asc_pisel
, CONSOLE_TTY
& 0x1);
142 /* TXFIFO's filling level */
143 SET_BITFIELD(asc_txfcon
, ASCTXFCON_TXFITLMASK
,
144 ASCTXFCON_TXFITLOFF
, ASC_TXFIFO_FL
);
146 SET_BIT(asc_txfcon
, ASCTXFCON_TXFEN
);
148 /* RXFIFO's filling level */
149 SET_BITFIELD(asc_txfcon
, ASCRXFCON_RXFITLMASK
,
150 ASCRXFCON_RXFITLOFF
, ASC_RXFIFO_FL
);
152 SET_BIT(asc_rxfcon
, ASCRXFCON_RXFEN
);
157 /* enable error signals & Receiver enable */
158 SET_BIT(asc_whbstate
, ASCWHBSTATE_SETREN
|ASCCON_FEN
|ASCCON_TOEN
|ASCCON_ROEN
);
164 void serial_putc (const char c
)
168 static u8
* debug
= (u8
*) DEBUG_ASC_RAW_TX_BUF
;
173 /* check do we have a free space in the TX FIFO */
174 /* get current filling level */
176 txFl
= ( asc_readl(asc_fstat
) & ASCFSTAT_TXFFLMASK
) >> ASCFSTAT_TXFFLOFF
;
178 while ( txFl
== ASC_TXFIFO_FULL
);
180 asc_writel(asc_tbuf
, c
); /* write char to Transmit Buffer Register */
182 /* check for errors */
183 if ( asc_readl(asc_state
) & ASCSTATE_TOE
) {
184 SET_BIT(asc_whbstate
, ASCWHBSTATE_CLRTOE
);
189 void serial_puts (const char *s
)
196 int serial_getc (void)
199 while ((asc_readl(asc_fstat
) & ASCFSTAT_RXFFLMASK
) == 0 );
200 c
= (char)(asc_readl(asc_rbuf
) & 0xff);
203 static u8
* debug
=(u8
*)(DEBUG_ASC_RAW_RX_BUF
);
210 int serial_tstc (void)
214 if ( (asc_readl(asc_fstat
) & ASCFSTAT_RXFFLMASK
) == 0 ) {
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