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42d1f039 WD |
1 | /* |
2 | * (C) Copyright 2003 Motorola Inc. | |
3 | * Xianghua Xiao (X.Xiao@motorola.com) | |
4 | * Modified based on 8260 for 8560. | |
5 | * | |
6 | * (C) Copyright 2000 | |
7 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
8 | * | |
9 | * See file CREDITS for list of people who contributed to this | |
10 | * project. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License as | |
14 | * published by the Free Software Foundation; either version 2 of | |
15 | * the License, or (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
25 | * MA 02111-1307 USA | |
26 | * | |
27 | * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00. | |
28 | */ | |
29 | ||
30 | /* | |
31 | * Minimal serial functions needed to use one of the SCC ports | |
32 | * as serial console interface. | |
33 | */ | |
34 | ||
35 | #include <common.h> | |
36 | #include <asm/cpm_85xx.h> | |
37 | ||
d87080b7 WD |
38 | DECLARE_GLOBAL_DATA_PTR; |
39 | ||
42d1f039 WD |
40 | #if defined(CONFIG_CONS_ON_SCC) |
41 | ||
42 | #if CONFIG_CONS_INDEX == 1 /* Console on SCC1 */ | |
43 | ||
44 | #define SCC_INDEX 0 | |
45 | #define PROFF_SCC PROFF_SCC1 | |
46 | #define CMXSCR_MASK (CMXSCR_GR1|CMXSCR_SC1|\ | |
47 | CMXSCR_RS1CS_MSK|CMXSCR_TS1CS_MSK) | |
48 | #define CMXSCR_VALUE (CMXSCR_RS1CS_BRG1|CMXSCR_TS1CS_BRG1) | |
49 | #define CPM_CR_SCC_PAGE CPM_CR_SCC1_PAGE | |
50 | #define CPM_CR_SCC_SBLOCK CPM_CR_SCC1_SBLOCK | |
51 | ||
52 | #elif CONFIG_CONS_INDEX == 2 /* Console on SCC2 */ | |
53 | ||
54 | #define SCC_INDEX 1 | |
55 | #define PROFF_SCC PROFF_SCC2 | |
56 | #define CMXSCR_MASK (CMXSCR_GR2|CMXSCR_SC2|\ | |
57 | CMXSCR_RS2CS_MSK|CMXSCR_TS2CS_MSK) | |
58 | #define CMXSCR_VALUE (CMXSCR_RS2CS_BRG2|CMXSCR_TS2CS_BRG2) | |
59 | #define CPM_CR_SCC_PAGE CPM_CR_SCC2_PAGE | |
60 | #define CPM_CR_SCC_SBLOCK CPM_CR_SCC2_SBLOCK | |
61 | ||
62 | #elif CONFIG_CONS_INDEX == 3 /* Console on SCC3 */ | |
63 | ||
64 | #define SCC_INDEX 2 | |
65 | #define PROFF_SCC PROFF_SCC3 | |
66 | #define CMXSCR_MASK (CMXSCR_GR3|CMXSCR_SC3|\ | |
67 | CMXSCR_RS3CS_MSK|CMXSCR_TS3CS_MSK) | |
68 | #define CMXSCR_VALUE (CMXSCR_RS3CS_BRG3|CMXSCR_TS3CS_BRG3) | |
69 | #define CPM_CR_SCC_PAGE CPM_CR_SCC3_PAGE | |
70 | #define CPM_CR_SCC_SBLOCK CPM_CR_SCC3_SBLOCK | |
71 | ||
72 | #elif CONFIG_CONS_INDEX == 4 /* Console on SCC4 */ | |
73 | ||
74 | #define SCC_INDEX 3 | |
75 | #define PROFF_SCC PROFF_SCC4 | |
76 | #define CMXSCR_MASK (CMXSCR_GR4|CMXSCR_SC4|\ | |
77 | CMXSCR_RS4CS_MSK|CMXSCR_TS4CS_MSK) | |
78 | #define CMXSCR_VALUE (CMXSCR_RS4CS_BRG4|CMXSCR_TS4CS_BRG4) | |
79 | #define CPM_CR_SCC_PAGE CPM_CR_SCC4_PAGE | |
80 | #define CPM_CR_SCC_SBLOCK CPM_CR_SCC4_SBLOCK | |
81 | ||
82 | #else | |
83 | ||
84 | #error "console not correctly defined" | |
85 | ||
86 | #endif | |
87 | ||
88 | int serial_init (void) | |
89 | { | |
6d0f6bcf | 90 | volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR; |
42d1f039 WD |
91 | volatile ccsr_cpm_scc_t *sp; |
92 | volatile scc_uart_t *up; | |
93 | volatile cbd_t *tbdf, *rbdf; | |
aafeefbd | 94 | volatile ccsr_cpm_cp_t *cp = &(cpm->im_cpm_cp); |
42d1f039 WD |
95 | uint dpaddr; |
96 | ||
97 | /* initialize pointers to SCC */ | |
98 | ||
aafeefbd KG |
99 | sp = (ccsr_cpm_scc_t *) &(cpm->im_cpm_scc[SCC_INDEX]); |
100 | up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]); | |
42d1f039 WD |
101 | |
102 | /* Disable transmitter/receiver. | |
103 | */ | |
104 | sp->gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT); | |
105 | ||
106 | /* put the SCC channel into NMSI (non multiplexd serial interface) | |
107 | * mode and wire the selected SCC Tx and Rx clocks to BRGx (15-15). | |
108 | */ | |
aafeefbd KG |
109 | cpm->im_cpm_mux.cmxscr = \ |
110 | (cpm->im_cpm_mux.cmxscr&~CMXSCR_MASK)|CMXSCR_VALUE; | |
42d1f039 WD |
111 | |
112 | /* Set up the baud rate generator. | |
113 | */ | |
114 | serial_setbrg (); | |
115 | ||
116 | /* Allocate space for two buffer descriptors in the DP ram. | |
117 | * damm: allocating space after the two buffers for rx/tx data | |
118 | */ | |
119 | ||
120 | dpaddr = m8560_cpm_dpalloc((2 * sizeof (cbd_t)) + 2, 16); | |
121 | ||
122 | /* Set the physical address of the host memory buffers in | |
123 | * the buffer descriptors. | |
124 | */ | |
aafeefbd | 125 | rbdf = (cbd_t *)&(cpm->im_dprambase[dpaddr]); |
42d1f039 WD |
126 | rbdf->cbd_bufaddr = (uint) (rbdf+2); |
127 | rbdf->cbd_sc = BD_SC_EMPTY | BD_SC_WRAP; | |
128 | tbdf = rbdf + 1; | |
129 | tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1; | |
130 | tbdf->cbd_sc = BD_SC_WRAP; | |
131 | ||
132 | /* Set up the uart parameters in the parameter ram. | |
133 | */ | |
134 | up->scc_genscc.scc_rbase = dpaddr; | |
135 | up->scc_genscc.scc_tbase = dpaddr+sizeof(cbd_t); | |
136 | up->scc_genscc.scc_rfcr = CPMFCR_EB; | |
137 | up->scc_genscc.scc_tfcr = CPMFCR_EB; | |
138 | up->scc_genscc.scc_mrblr = 1; | |
139 | up->scc_maxidl = 0; | |
140 | up->scc_brkcr = 1; | |
141 | up->scc_parec = 0; | |
142 | up->scc_frmec = 0; | |
143 | up->scc_nosec = 0; | |
144 | up->scc_brkec = 0; | |
145 | up->scc_uaddr1 = 0; | |
146 | up->scc_uaddr2 = 0; | |
147 | up->scc_toseq = 0; | |
148 | up->scc_char1 = up->scc_char2 = up->scc_char3 = up->scc_char4 = 0x8000; | |
149 | up->scc_char5 = up->scc_char6 = up->scc_char7 = up->scc_char8 = 0x8000; | |
150 | up->scc_rccm = 0xc0ff; | |
151 | ||
152 | /* Mask all interrupts and remove anything pending. | |
153 | */ | |
154 | sp->sccm = 0; | |
155 | sp->scce = 0xffff; | |
156 | ||
157 | /* Set 8 bit FIFO, 16 bit oversampling and UART mode. | |
158 | */ | |
159 | sp->gsmrh = SCC_GSMRH_RFW; /* 8 bit FIFO */ | |
160 | sp->gsmrl = \ | |
161 | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16 | SCC_GSMRL_MODE_UART; | |
162 | ||
163 | /* Set CTS no flow control, 1 stop bit, 8 bit character length, | |
164 | * normal async UART mode, no parity | |
165 | */ | |
166 | sp->psmr = SCU_PSMR_CL; | |
167 | ||
168 | /* execute the "Init Rx and Tx params" CP command. | |
169 | */ | |
170 | ||
171 | while (cp->cpcr & CPM_CR_FLG) /* wait if cp is busy */ | |
172 | ; | |
173 | ||
174 | cp->cpcr = mk_cr_cmd(CPM_CR_SCC_PAGE, CPM_CR_SCC_SBLOCK, | |
175 | 0, CPM_CR_INIT_TRX) | CPM_CR_FLG; | |
176 | ||
177 | while (cp->cpcr & CPM_CR_FLG) /* wait if cp is busy */ | |
178 | ; | |
179 | ||
180 | /* Enable transmitter/receiver. | |
181 | */ | |
182 | sp->gsmrl |= SCC_GSMRL_ENR | SCC_GSMRL_ENT; | |
183 | ||
184 | return (0); | |
185 | } | |
186 | ||
187 | void | |
188 | serial_setbrg (void) | |
189 | { | |
42d1f039 WD |
190 | #if defined(CONFIG_CONS_USE_EXTC) |
191 | m8560_cpm_extcbrg(SCC_INDEX, gd->baudrate, | |
192 | CONFIG_CONS_EXTC_RATE, CONFIG_CONS_EXTC_PINSEL); | |
193 | #else | |
194 | m8560_cpm_setbrg(SCC_INDEX, gd->baudrate); | |
195 | #endif | |
196 | } | |
197 | ||
198 | void | |
199 | serial_putc(const char c) | |
200 | { | |
201 | volatile scc_uart_t *up; | |
202 | volatile cbd_t *tbdf; | |
6d0f6bcf | 203 | volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR; |
42d1f039 WD |
204 | |
205 | if (c == '\n') | |
206 | serial_putc ('\r'); | |
207 | ||
aafeefbd KG |
208 | up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]); |
209 | tbdf = (cbd_t *)&(cpm->im_dprambase[up->scc_genscc.scc_tbase]); | |
42d1f039 WD |
210 | |
211 | /* Wait for last character to go. | |
212 | */ | |
213 | while (tbdf->cbd_sc & BD_SC_READY) | |
214 | ; | |
215 | ||
216 | /* Load the character into the transmit buffer. | |
217 | */ | |
218 | *(volatile char *)tbdf->cbd_bufaddr = c; | |
219 | tbdf->cbd_datlen = 1; | |
220 | tbdf->cbd_sc |= BD_SC_READY; | |
221 | } | |
222 | ||
223 | void | |
224 | serial_puts (const char *s) | |
225 | { | |
226 | while (*s) { | |
227 | serial_putc (*s++); | |
228 | } | |
229 | } | |
230 | ||
231 | int | |
232 | serial_getc(void) | |
233 | { | |
234 | volatile cbd_t *rbdf; | |
235 | volatile scc_uart_t *up; | |
6d0f6bcf | 236 | volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR; |
42d1f039 WD |
237 | unsigned char c; |
238 | ||
aafeefbd KG |
239 | up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]); |
240 | rbdf = (cbd_t *)&(cpm->im_dprambase[up->scc_genscc.scc_rbase]); | |
42d1f039 WD |
241 | |
242 | /* Wait for character to show up. | |
243 | */ | |
244 | while (rbdf->cbd_sc & BD_SC_EMPTY) | |
245 | ; | |
246 | ||
247 | /* Grab the char and clear the buffer again. | |
248 | */ | |
249 | c = *(volatile unsigned char *)rbdf->cbd_bufaddr; | |
250 | rbdf->cbd_sc |= BD_SC_EMPTY; | |
251 | ||
252 | return (c); | |
253 | } | |
254 | ||
255 | int | |
256 | serial_tstc() | |
257 | { | |
258 | volatile cbd_t *rbdf; | |
259 | volatile scc_uart_t *up; | |
6d0f6bcf | 260 | volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR; |
42d1f039 | 261 | |
aafeefbd KG |
262 | up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]); |
263 | rbdf = (cbd_t *)&(cpm->im_dprambase[up->scc_genscc.scc_rbase]); | |
42d1f039 WD |
264 | |
265 | return ((rbdf->cbd_sc & BD_SC_EMPTY) == 0); | |
266 | } | |
267 | ||
268 | #endif /* CONFIG_CONS_ON_SCC */ |