drivers/serial/cpm_uart/cpm_uart_cpm1.c

   1 /*
   2  *  linux/drivers/serial/cpm_uart.c
   3  *
   4  *  Driver for CPM (SCC/SMC) serial ports; CPM1 definitions
   5  *
   6  *  Maintainer: Kumar Gala (kumar.gala@freescale.com) (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
  50 void cpm_line_cr_cmd(int line, int cmd)
  51 {
  52         ushort val;
  53         volatile cpm8xx_t *cp = cpmp;
  54
  55         switch (line) {
  56         case UART_SMC1:
  57                 val = mk_cr_cmd(CPM_CR_CH_SMC1, cmd) | CPM_CR_FLG;
  58                 break;
  59         case UART_SMC2:
  60                 val = mk_cr_cmd(CPM_CR_CH_SMC2, cmd) | CPM_CR_FLG;
  61                 break;
  62         case UART_SCC1:
  63                 val = mk_cr_cmd(CPM_CR_CH_SCC1, cmd) | CPM_CR_FLG;
  64                 break;
  65         case UART_SCC2:
  66                 val = mk_cr_cmd(CPM_CR_CH_SCC2, cmd) | CPM_CR_FLG;
  67                 break;
  68         case UART_SCC3:
  69                 val = mk_cr_cmd(CPM_CR_CH_SCC3, cmd) | CPM_CR_FLG;
  70                 break;
  71         case UART_SCC4:
  72                 val = mk_cr_cmd(CPM_CR_CH_SCC4, cmd) | CPM_CR_FLG;
  73                 break;
  74         default:
  75                 return;
  76
  77         }
  78         cp->cp_cpcr = val;
  79         while (cp->cp_cpcr & CPM_CR_FLG) ;
  80 }
  81
  82 void smc1_lineif(struct uart_cpm_port *pinfo)
  83 {
  84         volatile cpm8xx_t *cp = cpmp;
  85         unsigned int iobits = 0x000000c0;
  86
  87         if (!pinfo->is_portb) {
  88                 cp->cp_pbpar |= iobits;
  89                 cp->cp_pbdir &= ~iobits;
  90                 cp->cp_pbodr &= ~iobits;
  91         } else {
  92                 ((immap_t *)IMAP_ADDR)->im_ioport.iop_papar |= iobits;
  93                 ((immap_t *)IMAP_ADDR)->im_ioport.iop_padir &= ~iobits;
  94                 ((immap_t *)IMAP_ADDR)->im_ioport.iop_paodr &= ~iobits;
  95         }
  96
  97 #ifdef CONFIG_MPC885ADS
  98         /* Enable SMC1 transceivers */
  99         {
 100                 volatile uint __iomem *bcsr1 = ioremap(BCSR1, 4);
 101                 uint tmp;
 102
 103                 tmp = in_be32(bcsr1);
 104                 tmp &= ~BCSR1_RS232EN_1;
 105                 out_be32(bcsr1, tmp);
 106                 iounmap(bcsr1);
 107         }
 108 #endif
 109
 110         pinfo->brg = 1;
 111 }
 112
 113 void smc2_lineif(struct uart_cpm_port *pinfo)
 114 {
 115 #ifdef CONFIG_MPC885ADS
 116         volatile cpm8xx_t *cp = cpmp;
 117         volatile uint __iomem *bcsr1;
 118         uint tmp;
 119
 120         cp->cp_pepar |= 0x00000c00;
 121         cp->cp_pedir &= ~0x00000c00;
 122         cp->cp_peso &= ~0x00000400;
 123         cp->cp_peso |= 0x00000800;
 124
 125         /* Enable SMC2 transceivers */
 126         bcsr1 = ioremap(BCSR1, 4);
 127         tmp = in_be32(bcsr1);
 128         tmp &= ~BCSR1_RS232EN_2;
 129         out_be32(bcsr1, tmp);
 130         iounmap(bcsr1);
 131 #endif
 132
 133         pinfo->brg = 2;
 134 }
 135
 136 void scc1_lineif(struct uart_cpm_port *pinfo)
 137 {
 138         /* XXX SCC1: insert port configuration here */
 139         pinfo->brg = 1;
 140 }
 141
 142 void scc2_lineif(struct uart_cpm_port *pinfo)
 143 {
 144         /* XXX SCC2: insert port configuration here */
 145         pinfo->brg = 2;
 146 }
 147
 148 void scc3_lineif(struct uart_cpm_port *pinfo)
 149 {
 150         /* XXX SCC3: insert port configuration here */
 151         pinfo->brg = 3;
 152 }
 153
 154 void scc4_lineif(struct uart_cpm_port *pinfo)
 155 {
 156         /* XXX SCC4: insert port configuration here */
 157         pinfo->brg = 4;
 158 }
 159
 160 /*
 161  * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
 162  * receive buffer descriptors from dual port ram, and a character
 163  * buffer area from host mem. If we are allocating for the console we need
 164  * to do it from bootmem
 165  */
 166 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 167 {
 168         int dpmemsz, memsz;
 169         u8 *dp_mem;
 170         uint dp_offset;
 171         u8 *mem_addr;
 172         dma_addr_t dma_addr = 0;
 173
 174         pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
 175
 176         dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
 177         dp_offset = cpm_dpalloc(dpmemsz, 8);
 178         if (IS_DPERR(dp_offset)) {
 179                 printk(KERN_ERR
 180                        "cpm_uart_cpm1.c: could not allocate buffer descriptors\n");
 181                 return -ENOMEM;
 182         }
 183         dp_mem = cpm_dpram_addr(dp_offset);
 184
 185         memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
 186             L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
 187         if (is_con) {
 188                 mem_addr = (u8 *) cpm_dpram_addr(cpm_dpalloc(memsz, 8));
 189                 dma_addr = 0;
 190         } else
 191                 mem_addr = dma_alloc_coherent(NULL, memsz, &dma_addr,
 192                                               GFP_KERNEL);
 193
 194         if (mem_addr == NULL) {
 195                 cpm_dpfree(dp_offset);
 196                 printk(KERN_ERR
 197                        "cpm_uart_cpm1.c: could not allocate coherent memory\n");
 198                 return -ENOMEM;
 199         }
 200
 201         pinfo->dp_addr = dp_offset;
 202         pinfo->mem_addr = mem_addr;
 203         pinfo->dma_addr = dma_addr;
 204
 205         pinfo->rx_buf = mem_addr;
 206         pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
 207                                                        * pinfo->rx_fifosize);
 208
 209         pinfo->rx_bd_base = (volatile cbd_t *)dp_mem;
 210         pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
 211
 212         return 0;
 213 }
 214
 215 void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
 216 {
 217         dma_free_coherent(NULL, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
 218                                                pinfo->rx_fifosize) +
 219                           L1_CACHE_ALIGN(pinfo->tx_nrfifos *
 220                                          pinfo->tx_fifosize), pinfo->mem_addr,
 221                           pinfo->dma_addr);
 222
 223         cpm_dpfree(pinfo->dp_addr);
 224 }
 225
 226 /* Setup any dynamic params in the uart desc */
 227 int cpm_uart_init_portdesc(void)
 228 {
 229         pr_debug("CPM uart[-]:init portdesc\n");
 230
 231         cpm_uart_nr = 0;
 232 #ifdef CONFIG_SERIAL_CPM_SMC1
 233         cpm_uart_ports[UART_SMC1].smcp = &cpmp->cp_smc[0];
 234 /*
 235  *  Is SMC1 being relocated?
 236  */
 237 # ifdef CONFIG_I2C_SPI_SMC1_UCODE_PATCH
 238         cpm_uart_ports[UART_SMC1].smcup =
 239             (smc_uart_t *) & cpmp->cp_dparam[0x3C0];
 240 # else
 241         cpm_uart_ports[UART_SMC1].smcup =
 242             (smc_uart_t *) & cpmp->cp_dparam[PROFF_SMC1];
 243 # endif
 244         cpm_uart_ports[UART_SMC1].port.mapbase =
 245             (unsigned long)&cpmp->cp_smc[0];
 246         cpm_uart_ports[UART_SMC1].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
 247         cpm_uart_ports[UART_SMC1].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 248         cpm_uart_ports[UART_SMC1].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 249         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1;
 250 #endif
 251
 252 #ifdef CONFIG_SERIAL_CPM_SMC2
 253         cpm_uart_ports[UART_SMC2].smcp = &cpmp->cp_smc[1];
 254         cpm_uart_ports[UART_SMC2].smcup =
 255             (smc_uart_t *) & cpmp->cp_dparam[PROFF_SMC2];
 256         cpm_uart_ports[UART_SMC2].port.mapbase =
 257             (unsigned long)&cpmp->cp_smc[1];
 258         cpm_uart_ports[UART_SMC2].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
 259         cpm_uart_ports[UART_SMC2].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 260         cpm_uart_ports[UART_SMC2].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 261         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2;
 262 #endif
 263
 264 #ifdef CONFIG_SERIAL_CPM_SCC1
 265         cpm_uart_ports[UART_SCC1].sccp = &cpmp->cp_scc[0];
 266         cpm_uart_ports[UART_SCC1].sccup =
 267             (scc_uart_t *) & cpmp->cp_dparam[PROFF_SCC1];
 268         cpm_uart_ports[UART_SCC1].port.mapbase =
 269             (unsigned long)&cpmp->cp_scc[0];
 270         cpm_uart_ports[UART_SCC1].sccp->scc_sccm &=
 271             ~(UART_SCCM_TX | UART_SCCM_RX);
 272         cpm_uart_ports[UART_SCC1].sccp->scc_gsmrl &=
 273             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 274         cpm_uart_ports[UART_SCC1].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 275         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1;
 276 #endif
 277
 278 #ifdef CONFIG_SERIAL_CPM_SCC2
 279         cpm_uart_ports[UART_SCC2].sccp = &cpmp->cp_scc[1];
 280         cpm_uart_ports[UART_SCC2].sccup =
 281             (scc_uart_t *) & cpmp->cp_dparam[PROFF_SCC2];
 282         cpm_uart_ports[UART_SCC2].port.mapbase =
 283             (unsigned long)&cpmp->cp_scc[1];
 284         cpm_uart_ports[UART_SCC2].sccp->scc_sccm &=
 285             ~(UART_SCCM_TX | UART_SCCM_RX);
 286         cpm_uart_ports[UART_SCC2].sccp->scc_gsmrl &=
 287             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 288         cpm_uart_ports[UART_SCC2].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 289         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2;
 290 #endif
 291
 292 #ifdef CONFIG_SERIAL_CPM_SCC3
 293         cpm_uart_ports[UART_SCC3].sccp = &cpmp->cp_scc[2];
 294         cpm_uart_ports[UART_SCC3].sccup =
 295             (scc_uart_t *) & cpmp->cp_dparam[PROFF_SCC3];
 296         cpm_uart_ports[UART_SCC3].port.mapbase =
 297             (unsigned long)&cpmp->cp_scc[2];
 298         cpm_uart_ports[UART_SCC3].sccp->scc_sccm &=
 299             ~(UART_SCCM_TX | UART_SCCM_RX);
 300         cpm_uart_ports[UART_SCC3].sccp->scc_gsmrl &=
 301             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 302         cpm_uart_ports[UART_SCC3].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 303         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3;
 304 #endif
 305
 306 #ifdef CONFIG_SERIAL_CPM_SCC4
 307         cpm_uart_ports[UART_SCC4].sccp = &cpmp->cp_scc[3];
 308         cpm_uart_ports[UART_SCC4].sccup =
 309             (scc_uart_t *) & cpmp->cp_dparam[PROFF_SCC4];
 310         cpm_uart_ports[UART_SCC4].port.mapbase =
 311             (unsigned long)&cpmp->cp_scc[3];
 312         cpm_uart_ports[UART_SCC4].sccp->scc_sccm &=
 313             ~(UART_SCCM_TX | UART_SCCM_RX);
 314         cpm_uart_ports[UART_SCC4].sccp->scc_gsmrl &=
 315             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 316         cpm_uart_ports[UART_SCC4].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 317         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4;
 318 #endif
 319         return 0;
 320 }