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