tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/drivers/serial/cpm_uart_cpm2.c
3 *
4 * Driver for CPM (SCC/SMC) serial ports; CPM2 definitions
5 *
6 * Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
7 * Pantelis Antoniou (panto@intracom.gr) (CPM1)
8 *
9 * Copyright (C) 2004 Freescale Semiconductor, Inc.
10 * (C) 2004 Intracom, S.A.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (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, MA 02111-1307 USA
25 *
26 */
27
28#include <linux/config.h>
29#include <linux/module.h>
30#include <linux/tty.h>
31#include <linux/ioport.h>
32#include <linux/init.h>
33#include <linux/serial.h>
34#include <linux/console.h>
35#include <linux/sysrq.h>
36#include <linux/device.h>
37#include <linux/bootmem.h>
38#include <linux/dma-mapping.h>
39
40#include <asm/io.h>
41#include <asm/irq.h>
42
43#include <linux/serial_core.h>
44#include <linux/kernel.h>
45
46#include "cpm_uart.h"
47
48/**************************************************************/
49
50void cpm_line_cr_cmd(int line, int cmd)
51{
52 volatile cpm_cpm2_t *cp = cpmp;
53 ulong val;
54
55 switch (line) {
56 case UART_SMC1:
57 val = mk_cr_cmd(CPM_CR_SMC1_PAGE, CPM_CR_SMC1_SBLOCK, 0,
58 cmd) | CPM_CR_FLG;
59 break;
60 case UART_SMC2:
61 val = mk_cr_cmd(CPM_CR_SMC2_PAGE, CPM_CR_SMC2_SBLOCK, 0,
62 cmd) | CPM_CR_FLG;
63 break;
64 case UART_SCC1:
65 val = mk_cr_cmd(CPM_CR_SCC1_PAGE, CPM_CR_SCC1_SBLOCK, 0,
66 cmd) | CPM_CR_FLG;
67 break;
68 case UART_SCC2:
69 val = mk_cr_cmd(CPM_CR_SCC2_PAGE, CPM_CR_SCC2_SBLOCK, 0,
70 cmd) | CPM_CR_FLG;
71 break;
72 case UART_SCC3:
73 val = mk_cr_cmd(CPM_CR_SCC3_PAGE, CPM_CR_SCC3_SBLOCK, 0,
74 cmd) | CPM_CR_FLG;
75 break;
76 case UART_SCC4:
77 val = mk_cr_cmd(CPM_CR_SCC4_PAGE, CPM_CR_SCC4_SBLOCK, 0,
78 cmd) | CPM_CR_FLG;
79 break;
80 default:
81 return;
82
83 }
84 cp->cp_cpcr = val;
85 while (cp->cp_cpcr & CPM_CR_FLG) ;
86}
87
88void smc1_lineif(struct uart_cpm_port *pinfo)
89{
90 volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
91
92 /* SMC1 is only on port D */
93 io->iop_ppard |= 0x00c00000;
94 io->iop_pdird |= 0x00400000;
95 io->iop_pdird &= ~0x00800000;
96 io->iop_psord &= ~0x00c00000;
97
98 /* Wire BRG1 to SMC1 */
99 cpm2_immr->im_cpmux.cmx_smr &= 0x0f;
100 pinfo->brg = 1;
101}
102
103void smc2_lineif(struct uart_cpm_port *pinfo)
104{
105 volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
106
107 /* SMC2 is only on port A */
108 io->iop_ppara |= 0x00c00000;
109 io->iop_pdira |= 0x00400000;
110 io->iop_pdira &= ~0x00800000;
111 io->iop_psora &= ~0x00c00000;
112
113 /* Wire BRG2 to SMC2 */
114 cpm2_immr->im_cpmux.cmx_smr &= 0xf0;
115 pinfo->brg = 2;
116}
117
118void scc1_lineif(struct uart_cpm_port *pinfo)
119{
120 volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
121
122 /* Use Port D for SCC1 instead of other functions. */
123 io->iop_ppard |= 0x00000003;
124 io->iop_psord &= ~0x00000001; /* Rx */
125 io->iop_psord |= 0x00000002; /* Tx */
126 io->iop_pdird &= ~0x00000001; /* Rx */
127 io->iop_pdird |= 0x00000002; /* Tx */
128
129 /* Wire BRG1 to SCC1 */
130 cpm2_immr->im_cpmux.cmx_scr &= 0x00ffffff;
131 cpm2_immr->im_cpmux.cmx_scr |= 0x00000000;
132 pinfo->brg = 1;
133}
134
135void scc2_lineif(struct uart_cpm_port *pinfo)
136{
137 /*
138 * STx GP3 uses the SCC2 secondary option pin assignment
139 * which this driver doesn't account for in the static
140 * pin assignments. This kind of board specific info
141 * really has to get out of the driver so boards can
142 * be supported in a sane fashion.
143 */
144#ifndef CONFIG_STX_GP3
145#ifdef CONFIG_MPC8560_ADS
146 volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
147 io->iop_ppard |= 0x00000018;
148 io->iop_psord &= ~0x00000008; /* Rx */
149 io->iop_psord &= ~0x00000010; /* Tx */
150 io->iop_pdird &= ~0x00000008; /* Rx */
151 io->iop_pdird |= 0x00000010; /* Tx */
152#else
153 volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
154 io->iop_pparb |= 0x008b0000;
155 io->iop_pdirb |= 0x00880000;
156 io->iop_psorb |= 0x00880000;
157 io->iop_pdirb &= ~0x00030000;
158 io->iop_psorb &= ~0x00030000;
159#endif
160#endif
161 cpm2_immr->im_cpmux.cmx_scr &= 0xff00ffff;
162 cpm2_immr->im_cpmux.cmx_scr |= 0x00090000;
163 pinfo->brg = 2;
164}
165
166void scc3_lineif(struct uart_cpm_port *pinfo)
167{
168 volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
169 io->iop_pparb |= 0x008b0000;
170 io->iop_pdirb |= 0x00880000;
171 io->iop_psorb |= 0x00880000;
172 io->iop_pdirb &= ~0x00030000;
173 io->iop_psorb &= ~0x00030000;
174 cpm2_immr->im_cpmux.cmx_scr &= 0xffff00ff;
175 cpm2_immr->im_cpmux.cmx_scr |= 0x00001200;
176 pinfo->brg = 3;
177}
178
179void scc4_lineif(struct uart_cpm_port *pinfo)
180{
181 volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
182
183 io->iop_ppard |= 0x00000600;
184 io->iop_psord &= ~0x00000600; /* Tx/Rx */
185 io->iop_pdird &= ~0x00000200; /* Rx */
186 io->iop_pdird |= 0x00000400; /* Tx */
187
188 cpm2_immr->im_cpmux.cmx_scr &= 0xffffff00;
189 cpm2_immr->im_cpmux.cmx_scr |= 0x0000001b;
190 pinfo->brg = 4;
191}
192
193/*
194 * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
195 * receive buffer descriptors from dual port ram, and a character
196 * buffer area from host mem. If we are allocating for the console we need
197 * to do it from bootmem
198 */
199int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
200{
201 int dpmemsz, memsz;
202 u8 *dp_mem;
203 uint dp_offset;
204 u8 *mem_addr;
205 dma_addr_t dma_addr = 0;
206
207 pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
208
209 dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
210 dp_offset = cpm_dpalloc(dpmemsz, 8);
211 if (IS_DPERR(dp_offset)) {
212 printk(KERN_ERR
213 "cpm_uart_cpm.c: could not allocate buffer descriptors\n");
214 return -ENOMEM;
215 }
216
217 dp_mem = cpm_dpram_addr(dp_offset);
218
219 memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
220 L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
221 if (is_con)
222 mem_addr = alloc_bootmem(memsz);
223 else
224 mem_addr = dma_alloc_coherent(NULL, memsz, &dma_addr,
225 GFP_KERNEL);
226
227 if (mem_addr == NULL) {
228 cpm_dpfree(dp_offset);
229 printk(KERN_ERR
230 "cpm_uart_cpm.c: could not allocate coherent memory\n");
231 return -ENOMEM;
232 }
233
234 pinfo->dp_addr = dp_offset;
235 pinfo->mem_addr = mem_addr;
236 pinfo->dma_addr = dma_addr;
237
238 pinfo->rx_buf = mem_addr;
239 pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
240 * pinfo->rx_fifosize);
241
242 pinfo->rx_bd_base = (volatile cbd_t *)dp_mem;
243 pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
244
245 return 0;
246}
247
248void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
249{
250 dma_free_coherent(NULL, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
251 pinfo->rx_fifosize) +
252 L1_CACHE_ALIGN(pinfo->tx_nrfifos *
253 pinfo->tx_fifosize), pinfo->mem_addr,
254 pinfo->dma_addr);
255
256 cpm_dpfree(pinfo->dp_addr);
257}
258
259/* Setup any dynamic params in the uart desc */
260int cpm_uart_init_portdesc(void)
261{
262 pr_debug("CPM uart[-]:init portdesc\n");
263
264 cpm_uart_nr = 0;
265#ifdef CONFIG_SERIAL_CPM_SMC1
266 cpm_uart_ports[UART_SMC1].smcp = (smc_t *) & cpm2_immr->im_smc[0];
267 cpm_uart_ports[UART_SMC1].smcup =
268 (smc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SMC1];
269 *(u16 *)(&cpm2_immr->im_dprambase[PROFF_SMC1_BASE]) = PROFF_SMC1;
270 cpm_uart_ports[UART_SMC1].port.mapbase =
271 (unsigned long)&cpm2_immr->im_smc[0];
272 cpm_uart_ports[UART_SMC1].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
273 cpm_uart_ports[UART_SMC1].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
274 cpm_uart_ports[UART_SMC1].port.uartclk = (((bd_t *) __res)->bi_intfreq);
275 cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1;
276#endif
277
278#ifdef CONFIG_SERIAL_CPM_SMC2
279 cpm_uart_ports[UART_SMC2].smcp = (smc_t *) & cpm2_immr->im_smc[1];
280 cpm_uart_ports[UART_SMC2].smcup =
281 (smc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SMC2];
282 *(u16 *)(&cpm2_immr->im_dprambase[PROFF_SMC2_BASE]) = PROFF_SMC2;
283 cpm_uart_ports[UART_SMC2].port.mapbase =
284 (unsigned long)&cpm2_immr->im_smc[1];
285 cpm_uart_ports[UART_SMC2].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
286 cpm_uart_ports[UART_SMC2].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
287 cpm_uart_ports[UART_SMC2].port.uartclk = (((bd_t *) __res)->bi_intfreq);
288 cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2;
289#endif
290
291#ifdef CONFIG_SERIAL_CPM_SCC1
292 cpm_uart_ports[UART_SCC1].sccp = (scc_t *) & cpm2_immr->im_scc[0];
293 cpm_uart_ports[UART_SCC1].sccup =
294 (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC1];
295 cpm_uart_ports[UART_SCC1].port.mapbase =
296 (unsigned long)&cpm2_immr->im_scc[0];
297 cpm_uart_ports[UART_SCC1].sccp->scc_sccm &=
298 ~(UART_SCCM_TX | UART_SCCM_RX);
299 cpm_uart_ports[UART_SCC1].sccp->scc_gsmrl &=
300 ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
301 cpm_uart_ports[UART_SCC1].port.uartclk = (((bd_t *) __res)->bi_intfreq);
302 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1;
303#endif
304
305#ifdef CONFIG_SERIAL_CPM_SCC2
306 cpm_uart_ports[UART_SCC2].sccp = (scc_t *) & cpm2_immr->im_scc[1];
307 cpm_uart_ports[UART_SCC2].sccup =
308 (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC2];
309 cpm_uart_ports[UART_SCC2].port.mapbase =
310 (unsigned long)&cpm2_immr->im_scc[1];
311 cpm_uart_ports[UART_SCC2].sccp->scc_sccm &=
312 ~(UART_SCCM_TX | UART_SCCM_RX);
313 cpm_uart_ports[UART_SCC2].sccp->scc_gsmrl &=
314 ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
315 cpm_uart_ports[UART_SCC2].port.uartclk = (((bd_t *) __res)->bi_intfreq);
316 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2;
317#endif
318
319#ifdef CONFIG_SERIAL_CPM_SCC3
320 cpm_uart_ports[UART_SCC3].sccp = (scc_t *) & cpm2_immr->im_scc[2];
321 cpm_uart_ports[UART_SCC3].sccup =
322 (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC3];
323 cpm_uart_ports[UART_SCC3].port.mapbase =
324 (unsigned long)&cpm2_immr->im_scc[2];
325 cpm_uart_ports[UART_SCC3].sccp->scc_sccm &=
326 ~(UART_SCCM_TX | UART_SCCM_RX);
327 cpm_uart_ports[UART_SCC3].sccp->scc_gsmrl &=
328 ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
329 cpm_uart_ports[UART_SCC3].port.uartclk = (((bd_t *) __res)->bi_intfreq);
330 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3;
331#endif
332
333#ifdef CONFIG_SERIAL_CPM_SCC4
334 cpm_uart_ports[UART_SCC4].sccp = (scc_t *) & cpm2_immr->im_scc[3];
335 cpm_uart_ports[UART_SCC4].sccup =
336 (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC4];
337 cpm_uart_ports[UART_SCC4].port.mapbase =
338 (unsigned long)&cpm2_immr->im_scc[3];
339 cpm_uart_ports[UART_SCC4].sccp->scc_sccm &=
340 ~(UART_SCCM_TX | UART_SCCM_RX);
341 cpm_uart_ports[UART_SCC4].sccp->scc_gsmrl &=
342 ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
343 cpm_uart_ports[UART_SCC4].port.uartclk = (((bd_t *) __res)->bi_intfreq);
344 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4;
345#endif
346
347 return 0;
348}