drivers/serial/cpm_uart/cpm_uart_cpm2.c

   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  *            (C) 2006 MontaVista Software, Inc.
  12  *              Vitaly Bordug <vbordug@ru.mvista.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/tty.h>
  32 #include <linux/ioport.h>
  33 #include <linux/init.h>
  34 #include <linux/serial.h>
  35 #include <linux/console.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/device.h>
  38 #include <linux/bootmem.h>
  39 #include <linux/dma-mapping.h>
  40
  41 #include <asm/io.h>
  42 #include <asm/irq.h>
  43 #include <asm/fs_pd.h>
  44
  45 #include <linux/serial_core.h>
  46 #include <linux/kernel.h>
  47
  48 #include "cpm_uart.h"
  49
  50 /**************************************************************/
  51
  52 void cpm_line_cr_cmd(int line, int cmd)
  53 {
  54         ulong val;
  55         volatile cpm_cpm2_t *cp = cpm2_map(im_cpm);
  56
  57
  58         switch (line) {
  59         case UART_SMC1:
  60                 val = mk_cr_cmd(CPM_CR_SMC1_PAGE, CPM_CR_SMC1_SBLOCK, 0,
  61                                 cmd) | CPM_CR_FLG;
  62                 break;
  63         case UART_SMC2:
  64                 val = mk_cr_cmd(CPM_CR_SMC2_PAGE, CPM_CR_SMC2_SBLOCK, 0,
  65                                 cmd) | CPM_CR_FLG;
  66                 break;
  67         case UART_SCC1:
  68                 val = mk_cr_cmd(CPM_CR_SCC1_PAGE, CPM_CR_SCC1_SBLOCK, 0,
  69                                 cmd) | CPM_CR_FLG;
  70                 break;
  71         case UART_SCC2:
  72                 val = mk_cr_cmd(CPM_CR_SCC2_PAGE, CPM_CR_SCC2_SBLOCK, 0,
  73                                 cmd) | CPM_CR_FLG;
  74                 break;
  75         case UART_SCC3:
  76                 val = mk_cr_cmd(CPM_CR_SCC3_PAGE, CPM_CR_SCC3_SBLOCK, 0,
  77                                 cmd) | CPM_CR_FLG;
  78                 break;
  79         case UART_SCC4:
  80                 val = mk_cr_cmd(CPM_CR_SCC4_PAGE, CPM_CR_SCC4_SBLOCK, 0,
  81                                 cmd) | CPM_CR_FLG;
  82                 break;
  83         default:
  84                 return;
  85
  86         }
  87         cp->cp_cpcr = val;
  88         while (cp->cp_cpcr & CPM_CR_FLG) ;
  89
  90         cpm2_unmap(cp);
  91 }
  92
  93 void smc1_lineif(struct uart_cpm_port *pinfo)
  94 {
  95         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
  96         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
  97
  98         /* SMC1 is only on port D */
  99         io->iop_ppard |= 0x00c00000;
 100         io->iop_pdird |= 0x00400000;
 101         io->iop_pdird &= ~0x00800000;
 102         io->iop_psord &= ~0x00c00000;
 103
 104         /* Wire BRG1 to SMC1 */
 105         cpmux->cmx_smr &= 0x0f;
 106         pinfo->brg = 1;
 107
 108         cpm2_unmap(cpmux);
 109         cpm2_unmap(io);
 110 }
 111
 112 void smc2_lineif(struct uart_cpm_port *pinfo)
 113 {
 114         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
 115         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 116
 117         /* SMC2 is only on port A */
 118         io->iop_ppara |= 0x00c00000;
 119         io->iop_pdira |= 0x00400000;
 120         io->iop_pdira &= ~0x00800000;
 121         io->iop_psora &= ~0x00c00000;
 122
 123         /* Wire BRG2 to SMC2 */
 124         cpmux->cmx_smr &= 0xf0;
 125         pinfo->brg = 2;
 126
 127         cpm2_unmap(cpmux);
 128         cpm2_unmap(io);
 129 }
 130
 131 void scc1_lineif(struct uart_cpm_port *pinfo)
 132 {
 133         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
 134         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 135
 136         /* Use Port D for SCC1 instead of other functions.  */
 137         io->iop_ppard |= 0x00000003;
 138         io->iop_psord &= ~0x00000001;   /* Rx */
 139         io->iop_psord |= 0x00000002;    /* Tx */
 140         io->iop_pdird &= ~0x00000001;   /* Rx */
 141         io->iop_pdird |= 0x00000002;    /* Tx */
 142
 143         /* Wire BRG1 to SCC1 */
 144         cpmux->cmx_scr &= 0x00ffffff;
 145         cpmux->cmx_scr |= 0x00000000;
 146         pinfo->brg = 1;
 147
 148         cpm2_unmap(cpmux);
 149         cpm2_unmap(io);
 150 }
 151
 152 void scc2_lineif(struct uart_cpm_port *pinfo)
 153 {
 154         /*
 155          * STx GP3 uses the SCC2 secondary option pin assignment
 156          * which this driver doesn't account for in the static
 157          * pin assignments. This kind of board specific info
 158          * really has to get out of the driver so boards can
 159          * be supported in a sane fashion.
 160          */
 161 #ifndef CONFIG_STX_GP3
 162         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
 163         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 164
 165         io->iop_pparb |= 0x008b0000;
 166         io->iop_pdirb |= 0x00880000;
 167         io->iop_psorb |= 0x00880000;
 168         io->iop_pdirb &= ~0x00030000;
 169         io->iop_psorb &= ~0x00030000;
 170 #endif
 171         cpmux->cmx_scr &= 0xff00ffff;
 172         cpmux->cmx_scr |= 0x00090000;
 173         pinfo->brg = 2;
 174
 175         cpm2_unmap(cpmux);
 176         cpm2_unmap(io);
 177 }
 178
 179 void scc3_lineif(struct uart_cpm_port *pinfo)
 180 {
 181         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
 182         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 183
 184         io->iop_pparb |= 0x008b0000;
 185         io->iop_pdirb |= 0x00880000;
 186         io->iop_psorb |= 0x00880000;
 187         io->iop_pdirb &= ~0x00030000;
 188         io->iop_psorb &= ~0x00030000;
 189         cpmux->cmx_scr &= 0xffff00ff;
 190         cpmux->cmx_scr |= 0x00001200;
 191         pinfo->brg = 3;
 192
 193         cpm2_unmap(cpmux);
 194         cpm2_unmap(io);
 195 }
 196
 197 void scc4_lineif(struct uart_cpm_port *pinfo)
 198 {
 199         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
 200         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 201
 202         io->iop_ppard |= 0x00000600;
 203         io->iop_psord &= ~0x00000600;   /* Tx/Rx */
 204         io->iop_pdird &= ~0x00000200;   /* Rx */
 205         io->iop_pdird |= 0x00000400;    /* Tx */
 206
 207         cpmux->cmx_scr &= 0xffffff00;
 208         cpmux->cmx_scr |= 0x0000001b;
 209         pinfo->brg = 4;
 210
 211         cpm2_unmap(cpmux);
 212         cpm2_unmap(io);
 213 }
 214
 215 /*
 216  * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
 217  * receive buffer descriptors from dual port ram, and a character
 218  * buffer area from host mem. If we are allocating for the console we need
 219  * to do it from bootmem
 220  */
 221 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 222 {
 223         int dpmemsz, memsz;
 224         u8 *dp_mem;
 225         uint dp_offset;
 226         u8 *mem_addr;
 227         dma_addr_t dma_addr = 0;
 228
 229         pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
 230
 231         dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
 232         dp_offset = cpm_dpalloc(dpmemsz, 8);
 233         if (IS_DPERR(dp_offset)) {
 234                 printk(KERN_ERR
 235                        "cpm_uart_cpm.c: could not allocate buffer descriptors\n");
 236                 return -ENOMEM;
 237         }
 238
 239         dp_mem = cpm_dpram_addr(dp_offset);
 240
 241         memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
 242             L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
 243         if (is_con) {
 244                 mem_addr = alloc_bootmem(memsz);
 245                 dma_addr = virt_to_bus(mem_addr);
 246         }
 247         else
 248                 mem_addr = dma_alloc_coherent(NULL, memsz, &dma_addr,
 249                                               GFP_KERNEL);
 250
 251         if (mem_addr == NULL) {
 252                 cpm_dpfree(dp_offset);
 253                 printk(KERN_ERR
 254                        "cpm_uart_cpm.c: could not allocate coherent memory\n");
 255                 return -ENOMEM;
 256         }
 257
 258         pinfo->dp_addr = dp_offset;
 259         pinfo->mem_addr = mem_addr;
 260         pinfo->dma_addr = dma_addr;
 261         pinfo->mem_size = memsz;
 262
 263         pinfo->rx_buf = mem_addr;
 264         pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
 265                                                        * pinfo->rx_fifosize);
 266
 267         pinfo->rx_bd_base = (volatile cbd_t *)dp_mem;
 268         pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
 269
 270         return 0;
 271 }
 272
 273 void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
 274 {
 275         dma_free_coherent(NULL, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
 276                                                pinfo->rx_fifosize) +
 277                           L1_CACHE_ALIGN(pinfo->tx_nrfifos *
 278                                          pinfo->tx_fifosize), pinfo->mem_addr,
 279                           pinfo->dma_addr);
 280
 281         cpm_dpfree(pinfo->dp_addr);
 282 }
 283
 284 /* Setup any dynamic params in the uart desc */
 285 int __init cpm_uart_init_portdesc(void)
 286 {
 287 #if defined(CONFIG_SERIAL_CPM_SMC1) || defined(CONFIG_SERIAL_CPM_SMC2)
 288         u16 *addr;
 289 #endif
 290         pr_debug("CPM uart[-]:init portdesc\n");
 291
 292         cpm_uart_nr = 0;
 293 #ifdef CONFIG_SERIAL_CPM_SMC1
 294         cpm_uart_ports[UART_SMC1].smcp = (smc_t *) cpm2_map(im_smc[0]);
 295         cpm_uart_ports[UART_SMC1].port.mapbase =
 296             (unsigned long)cpm_uart_ports[UART_SMC1].smcp;
 297
 298         cpm_uart_ports[UART_SMC1].smcup =
 299             (smc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SMC1], PROFF_SMC_SIZE);
 300         addr = (u16 *)cpm2_map_size(im_dprambase[PROFF_SMC1_BASE], 2);
 301         *addr = PROFF_SMC1;
 302         cpm2_unmap(addr);
 303
 304         cpm_uart_ports[UART_SMC1].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
 305         cpm_uart_ports[UART_SMC1].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 306         cpm_uart_ports[UART_SMC1].port.uartclk = uart_clock();
 307         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1;
 308 #endif
 309
 310 #ifdef CONFIG_SERIAL_CPM_SMC2
 311         cpm_uart_ports[UART_SMC2].smcp = (smc_t *) cpm2_map(im_smc[1]);
 312         cpm_uart_ports[UART_SMC2].port.mapbase =
 313             (unsigned long)cpm_uart_ports[UART_SMC2].smcp;
 314
 315         cpm_uart_ports[UART_SMC2].smcup =
 316             (smc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SMC2], PROFF_SMC_SIZE);
 317         addr = (u16 *)cpm2_map_size(im_dprambase[PROFF_SMC2_BASE], 2);
 318         *addr = PROFF_SMC2;
 319         cpm2_unmap(addr);
 320
 321         cpm_uart_ports[UART_SMC2].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
 322         cpm_uart_ports[UART_SMC2].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 323         cpm_uart_ports[UART_SMC2].port.uartclk = uart_clock();
 324         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2;
 325 #endif
 326
 327 #ifdef CONFIG_SERIAL_CPM_SCC1
 328         cpm_uart_ports[UART_SCC1].sccp = (scc_t *) cpm2_map(im_scc[0]);
 329         cpm_uart_ports[UART_SCC1].port.mapbase =
 330             (unsigned long)cpm_uart_ports[UART_SCC1].sccp;
 331         cpm_uart_ports[UART_SCC1].sccup =
 332             (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC1], PROFF_SCC_SIZE);
 333
 334         cpm_uart_ports[UART_SCC1].sccp->scc_sccm &=
 335             ~(UART_SCCM_TX | UART_SCCM_RX);
 336         cpm_uart_ports[UART_SCC1].sccp->scc_gsmrl &=
 337             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 338         cpm_uart_ports[UART_SCC1].port.uartclk = uart_clock();
 339         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1;
 340 #endif
 341
 342 #ifdef CONFIG_SERIAL_CPM_SCC2
 343         cpm_uart_ports[UART_SCC2].sccp = (scc_t *) cpm2_map(im_scc[1]);
 344         cpm_uart_ports[UART_SCC2].port.mapbase =
 345             (unsigned long)cpm_uart_ports[UART_SCC2].sccp;
 346         cpm_uart_ports[UART_SCC2].sccup =
 347             (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC2], PROFF_SCC_SIZE);
 348
 349         cpm_uart_ports[UART_SCC2].sccp->scc_sccm &=
 350             ~(UART_SCCM_TX | UART_SCCM_RX);
 351         cpm_uart_ports[UART_SCC2].sccp->scc_gsmrl &=
 352             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 353         cpm_uart_ports[UART_SCC2].port.uartclk = uart_clock();
 354         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2;
 355 #endif
 356
 357 #ifdef CONFIG_SERIAL_CPM_SCC3
 358         cpm_uart_ports[UART_SCC3].sccp = (scc_t *) cpm2_map(im_scc[2]);
 359         cpm_uart_ports[UART_SCC3].port.mapbase =
 360             (unsigned long)cpm_uart_ports[UART_SCC3].sccp;
 361         cpm_uart_ports[UART_SCC3].sccup =
 362             (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC3], PROFF_SCC_SIZE);
 363
 364         cpm_uart_ports[UART_SCC3].sccp->scc_sccm &=
 365             ~(UART_SCCM_TX | UART_SCCM_RX);
 366         cpm_uart_ports[UART_SCC3].sccp->scc_gsmrl &=
 367             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 368         cpm_uart_ports[UART_SCC3].port.uartclk = uart_clock();
 369         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3;
 370 #endif
 371
 372 #ifdef CONFIG_SERIAL_CPM_SCC4
 373         cpm_uart_ports[UART_SCC4].sccp = (scc_t *) cpm2_map(im_scc[3]);
 374         cpm_uart_ports[UART_SCC4].port.mapbase =
 375             (unsigned long)cpm_uart_ports[UART_SCC4].sccp;
 376         cpm_uart_ports[UART_SCC4].sccup =
 377             (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC4], PROFF_SCC_SIZE);
 378
 379         cpm_uart_ports[UART_SCC4].sccp->scc_sccm &=
 380             ~(UART_SCCM_TX | UART_SCCM_RX);
 381         cpm_uart_ports[UART_SCC4].sccp->scc_gsmrl &=
 382             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 383         cpm_uart_ports[UART_SCC4].port.uartclk = uart_clock();
 384         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4;
 385 #endif
 386
 387         return 0;
 388 }