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 #ifdef CONFIG_PPC_CPM_NEW_BINDING
  45 #include <asm/prom.h>
  46 #endif
  47
  48 #include <linux/serial_core.h>
  49 #include <linux/kernel.h>
  50
  51 #include "cpm_uart.h"
  52
  53 /**************************************************************/
  54
  55 #ifdef CONFIG_PPC_CPM_NEW_BINDING
  56 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
  57 {
  58         cpm_command(port->command, cmd);
  59 }
  60
  61 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
  62                                 struct device_node *np)
  63 {
  64         void __iomem *pram;
  65         unsigned long offset;
  66         struct resource res;
  67         unsigned long len;
  68
  69         /* Don't remap parameter RAM if it has already been initialized
  70          * during console setup.
  71          */
  72         if (IS_SMC(port) && port->smcup)
  73                 return port->smcup;
  74         else if (!IS_SMC(port) && port->sccup)
  75                 return port->sccup;
  76
  77         if (of_address_to_resource(np, 1, &res))
  78                 return NULL;
  79
  80         len = 1 + res.end - res.start;
  81         pram = ioremap(res.start, len);
  82         if (!pram)
  83                 return NULL;
  84
  85         if (!IS_SMC(port))
  86                 return pram;
  87
  88         if (len != 2) {
  89                 printk(KERN_WARNING "cpm_uart[%d]: device tree references "
  90                         "SMC pram, using boot loader/wrapper pram mapping. "
  91                         "Please fix your device tree to reference the pram "
  92                         "base register instead.\n",
  93                         port->port.line);
  94                 return pram;
  95         }
  96
  97         offset = cpm_dpalloc(PROFF_SMC_SIZE, 64);
  98         out_be16(pram, offset);
  99         iounmap(pram);
 100         return cpm_muram_addr(offset);
 101 }
 102
 103 void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
 104 {
 105         if (!IS_SMC(port))
 106                 iounmap(pram);
 107 }
 108
 109 #else
 110 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
 111 {
 112         ulong val;
 113         int line = port - cpm_uart_ports;
 114         volatile cpm_cpm2_t *cp = cpm2_map(im_cpm);
 115
 116
 117         switch (line) {
 118         case UART_SMC1:
 119                 val = mk_cr_cmd(CPM_CR_SMC1_PAGE, CPM_CR_SMC1_SBLOCK, 0,
 120                                 cmd) | CPM_CR_FLG;
 121                 break;
 122         case UART_SMC2:
 123                 val = mk_cr_cmd(CPM_CR_SMC2_PAGE, CPM_CR_SMC2_SBLOCK, 0,
 124                                 cmd) | CPM_CR_FLG;
 125                 break;
 126         case UART_SCC1:
 127                 val = mk_cr_cmd(CPM_CR_SCC1_PAGE, CPM_CR_SCC1_SBLOCK, 0,
 128                                 cmd) | CPM_CR_FLG;
 129                 break;
 130         case UART_SCC2:
 131                 val = mk_cr_cmd(CPM_CR_SCC2_PAGE, CPM_CR_SCC2_SBLOCK, 0,
 132                                 cmd) | CPM_CR_FLG;
 133                 break;
 134         case UART_SCC3:
 135                 val = mk_cr_cmd(CPM_CR_SCC3_PAGE, CPM_CR_SCC3_SBLOCK, 0,
 136                                 cmd) | CPM_CR_FLG;
 137                 break;
 138         case UART_SCC4:
 139                 val = mk_cr_cmd(CPM_CR_SCC4_PAGE, CPM_CR_SCC4_SBLOCK, 0,
 140                                 cmd) | CPM_CR_FLG;
 141                 break;
 142         default:
 143                 return;
 144
 145         }
 146         cp->cp_cpcr = val;
 147         while (cp->cp_cpcr & CPM_CR_FLG) ;
 148
 149         cpm2_unmap(cp);
 150 }
 151
 152 void smc1_lineif(struct uart_cpm_port *pinfo)
 153 {
 154         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
 155         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 156
 157         /* SMC1 is only on port D */
 158         io->iop_ppard |= 0x00c00000;
 159         io->iop_pdird |= 0x00400000;
 160         io->iop_pdird &= ~0x00800000;
 161         io->iop_psord &= ~0x00c00000;
 162
 163         /* Wire BRG1 to SMC1 */
 164         cpmux->cmx_smr &= 0x0f;
 165         pinfo->brg = 1;
 166
 167         cpm2_unmap(cpmux);
 168         cpm2_unmap(io);
 169 }
 170
 171 void smc2_lineif(struct uart_cpm_port *pinfo)
 172 {
 173         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
 174         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 175
 176         /* SMC2 is only on port A */
 177         io->iop_ppara |= 0x00c00000;
 178         io->iop_pdira |= 0x00400000;
 179         io->iop_pdira &= ~0x00800000;
 180         io->iop_psora &= ~0x00c00000;
 181
 182         /* Wire BRG2 to SMC2 */
 183         cpmux->cmx_smr &= 0xf0;
 184         pinfo->brg = 2;
 185
 186         cpm2_unmap(cpmux);
 187         cpm2_unmap(io);
 188 }
 189
 190 void scc1_lineif(struct uart_cpm_port *pinfo)
 191 {
 192         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
 193         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 194
 195         /* Use Port D for SCC1 instead of other functions.  */
 196         io->iop_ppard |= 0x00000003;
 197         io->iop_psord &= ~0x00000001;   /* Rx */
 198         io->iop_psord |= 0x00000002;    /* Tx */
 199         io->iop_pdird &= ~0x00000001;   /* Rx */
 200         io->iop_pdird |= 0x00000002;    /* Tx */
 201
 202         /* Wire BRG1 to SCC1 */
 203         cpmux->cmx_scr &= 0x00ffffff;
 204         cpmux->cmx_scr |= 0x00000000;
 205         pinfo->brg = 1;
 206
 207         cpm2_unmap(cpmux);
 208         cpm2_unmap(io);
 209 }
 210
 211 void scc2_lineif(struct uart_cpm_port *pinfo)
 212 {
 213         /*
 214          * STx GP3 uses the SCC2 secondary option pin assignment
 215          * which this driver doesn't account for in the static
 216          * pin assignments. This kind of board specific info
 217          * really has to get out of the driver so boards can
 218          * be supported in a sane fashion.
 219          */
 220         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 221 #ifndef CONFIG_STX_GP3
 222         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
 223
 224         io->iop_pparb |= 0x008b0000;
 225         io->iop_pdirb |= 0x00880000;
 226         io->iop_psorb |= 0x00880000;
 227         io->iop_pdirb &= ~0x00030000;
 228         io->iop_psorb &= ~0x00030000;
 229 #endif
 230         cpmux->cmx_scr &= 0xff00ffff;
 231         cpmux->cmx_scr |= 0x00090000;
 232         pinfo->brg = 2;
 233
 234         cpm2_unmap(cpmux);
 235         cpm2_unmap(io);
 236 }
 237
 238 void scc3_lineif(struct uart_cpm_port *pinfo)
 239 {
 240         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
 241         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 242
 243         io->iop_pparb |= 0x008b0000;
 244         io->iop_pdirb |= 0x00880000;
 245         io->iop_psorb |= 0x00880000;
 246         io->iop_pdirb &= ~0x00030000;
 247         io->iop_psorb &= ~0x00030000;
 248         cpmux->cmx_scr &= 0xffff00ff;
 249         cpmux->cmx_scr |= 0x00001200;
 250         pinfo->brg = 3;
 251
 252         cpm2_unmap(cpmux);
 253         cpm2_unmap(io);
 254 }
 255
 256 void scc4_lineif(struct uart_cpm_port *pinfo)
 257 {
 258         volatile iop_cpm2_t *io = cpm2_map(im_ioport);
 259         volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 260
 261         io->iop_ppard |= 0x00000600;
 262         io->iop_psord &= ~0x00000600;   /* Tx/Rx */
 263         io->iop_pdird &= ~0x00000200;   /* Rx */
 264         io->iop_pdird |= 0x00000400;    /* Tx */
 265
 266         cpmux->cmx_scr &= 0xffffff00;
 267         cpmux->cmx_scr |= 0x0000001b;
 268         pinfo->brg = 4;
 269
 270         cpm2_unmap(cpmux);
 271         cpm2_unmap(io);
 272 }
 273 #endif
 274
 275 /*
 276  * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
 277  * receive buffer descriptors from dual port ram, and a character
 278  * buffer area from host mem. If we are allocating for the console we need
 279  * to do it from bootmem
 280  */
 281 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 282 {
 283         int dpmemsz, memsz;
 284         u8 __iomem *dp_mem;
 285         unsigned long dp_offset;
 286         u8 *mem_addr;
 287         dma_addr_t dma_addr = 0;
 288
 289         pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
 290
 291         dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
 292         dp_offset = cpm_dpalloc(dpmemsz, 8);
 293         if (IS_ERR_VALUE(dp_offset)) {
 294                 printk(KERN_ERR
 295                        "cpm_uart_cpm.c: could not allocate buffer descriptors\n");
 296                 return -ENOMEM;
 297         }
 298
 299         dp_mem = cpm_dpram_addr(dp_offset);
 300
 301         memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
 302             L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
 303         if (is_con) {
 304                 mem_addr = alloc_bootmem(memsz);
 305                 dma_addr = virt_to_bus(mem_addr);
 306         }
 307         else
 308                 mem_addr = dma_alloc_coherent(NULL, memsz, &dma_addr,
 309                                               GFP_KERNEL);
 310
 311         if (mem_addr == NULL) {
 312                 cpm_dpfree(dp_offset);
 313                 printk(KERN_ERR
 314                        "cpm_uart_cpm.c: could not allocate coherent memory\n");
 315                 return -ENOMEM;
 316         }
 317
 318         pinfo->dp_addr = dp_offset;
 319         pinfo->mem_addr = mem_addr;
 320         pinfo->dma_addr = dma_addr;
 321         pinfo->mem_size = memsz;
 322
 323         pinfo->rx_buf = mem_addr;
 324         pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
 325                                                        * pinfo->rx_fifosize);
 326
 327         pinfo->rx_bd_base = (cbd_t __iomem *)dp_mem;
 328         pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
 329
 330         return 0;
 331 }
 332
 333 void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
 334 {
 335         dma_free_coherent(NULL, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
 336                                                pinfo->rx_fifosize) +
 337                           L1_CACHE_ALIGN(pinfo->tx_nrfifos *
 338                                          pinfo->tx_fifosize), (void __force *)pinfo->mem_addr,
 339                           pinfo->dma_addr);
 340
 341         cpm_dpfree(pinfo->dp_addr);
 342 }
 343
 344 #ifndef CONFIG_PPC_CPM_NEW_BINDING
 345 /* Setup any dynamic params in the uart desc */
 346 int cpm_uart_init_portdesc(void)
 347 {
 348 #if defined(CONFIG_SERIAL_CPM_SMC1) || defined(CONFIG_SERIAL_CPM_SMC2)
 349         u16 *addr;
 350 #endif
 351         pr_debug("CPM uart[-]:init portdesc\n");
 352
 353         cpm_uart_nr = 0;
 354 #ifdef CONFIG_SERIAL_CPM_SMC1
 355         cpm_uart_ports[UART_SMC1].smcp = (smc_t *) cpm2_map(im_smc[0]);
 356         cpm_uart_ports[UART_SMC1].port.mapbase =
 357             (unsigned long)cpm_uart_ports[UART_SMC1].smcp;
 358
 359         cpm_uart_ports[UART_SMC1].smcup =
 360             (smc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SMC1], PROFF_SMC_SIZE);
 361         addr = (u16 *)cpm2_map_size(im_dprambase[PROFF_SMC1_BASE], 2);
 362         *addr = PROFF_SMC1;
 363         cpm2_unmap(addr);
 364
 365         cpm_uart_ports[UART_SMC1].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
 366         cpm_uart_ports[UART_SMC1].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 367         cpm_uart_ports[UART_SMC1].port.uartclk = uart_clock();
 368         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1;
 369 #endif
 370
 371 #ifdef CONFIG_SERIAL_CPM_SMC2
 372         cpm_uart_ports[UART_SMC2].smcp = (smc_t *) cpm2_map(im_smc[1]);
 373         cpm_uart_ports[UART_SMC2].port.mapbase =
 374             (unsigned long)cpm_uart_ports[UART_SMC2].smcp;
 375
 376         cpm_uart_ports[UART_SMC2].smcup =
 377             (smc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SMC2], PROFF_SMC_SIZE);
 378         addr = (u16 *)cpm2_map_size(im_dprambase[PROFF_SMC2_BASE], 2);
 379         *addr = PROFF_SMC2;
 380         cpm2_unmap(addr);
 381
 382         cpm_uart_ports[UART_SMC2].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
 383         cpm_uart_ports[UART_SMC2].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 384         cpm_uart_ports[UART_SMC2].port.uartclk = uart_clock();
 385         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2;
 386 #endif
 387
 388 #ifdef CONFIG_SERIAL_CPM_SCC1
 389         cpm_uart_ports[UART_SCC1].sccp = (scc_t *) cpm2_map(im_scc[0]);
 390         cpm_uart_ports[UART_SCC1].port.mapbase =
 391             (unsigned long)cpm_uart_ports[UART_SCC1].sccp;
 392         cpm_uart_ports[UART_SCC1].sccup =
 393             (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC1], PROFF_SCC_SIZE);
 394
 395         cpm_uart_ports[UART_SCC1].sccp->scc_sccm &=
 396             ~(UART_SCCM_TX | UART_SCCM_RX);
 397         cpm_uart_ports[UART_SCC1].sccp->scc_gsmrl &=
 398             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 399         cpm_uart_ports[UART_SCC1].port.uartclk = uart_clock();
 400         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1;
 401 #endif
 402
 403 #ifdef CONFIG_SERIAL_CPM_SCC2
 404         cpm_uart_ports[UART_SCC2].sccp = (scc_t *) cpm2_map(im_scc[1]);
 405         cpm_uart_ports[UART_SCC2].port.mapbase =
 406             (unsigned long)cpm_uart_ports[UART_SCC2].sccp;
 407         cpm_uart_ports[UART_SCC2].sccup =
 408             (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC2], PROFF_SCC_SIZE);
 409
 410         cpm_uart_ports[UART_SCC2].sccp->scc_sccm &=
 411             ~(UART_SCCM_TX | UART_SCCM_RX);
 412         cpm_uart_ports[UART_SCC2].sccp->scc_gsmrl &=
 413             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 414         cpm_uart_ports[UART_SCC2].port.uartclk = uart_clock();
 415         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2;
 416 #endif
 417
 418 #ifdef CONFIG_SERIAL_CPM_SCC3
 419         cpm_uart_ports[UART_SCC3].sccp = (scc_t *) cpm2_map(im_scc[2]);
 420         cpm_uart_ports[UART_SCC3].port.mapbase =
 421             (unsigned long)cpm_uart_ports[UART_SCC3].sccp;
 422         cpm_uart_ports[UART_SCC3].sccup =
 423             (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC3], PROFF_SCC_SIZE);
 424
 425         cpm_uart_ports[UART_SCC3].sccp->scc_sccm &=
 426             ~(UART_SCCM_TX | UART_SCCM_RX);
 427         cpm_uart_ports[UART_SCC3].sccp->scc_gsmrl &=
 428             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 429         cpm_uart_ports[UART_SCC3].port.uartclk = uart_clock();
 430         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3;
 431 #endif
 432
 433 #ifdef CONFIG_SERIAL_CPM_SCC4
 434         cpm_uart_ports[UART_SCC4].sccp = (scc_t *) cpm2_map(im_scc[3]);
 435         cpm_uart_ports[UART_SCC4].port.mapbase =
 436             (unsigned long)cpm_uart_ports[UART_SCC4].sccp;
 437         cpm_uart_ports[UART_SCC4].sccup =
 438             (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC4], PROFF_SCC_SIZE);
 439
 440         cpm_uart_ports[UART_SCC4].sccp->scc_sccm &=
 441             ~(UART_SCCM_TX | UART_SCCM_RX);
 442         cpm_uart_ports[UART_SCC4].sccp->scc_gsmrl &=
 443             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 444         cpm_uart_ports[UART_SCC4].port.uartclk = uart_clock();
 445         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4;
 446 #endif
 447
 448         return 0;
 449 }
 450 #endif