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 (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
  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         pinfo->brg = 1;
  85 }
  86
  87 void smc2_lineif(struct uart_cpm_port *pinfo)
  88 {
  89         pinfo->brg = 2;
  90 }
  91
  92 void scc1_lineif(struct uart_cpm_port *pinfo)
  93 {
  94         /* XXX SCC1: insert port configuration here */
  95         pinfo->brg = 1;
  96 }
  97
  98 void scc2_lineif(struct uart_cpm_port *pinfo)
  99 {
 100         /* XXX SCC2: insert port configuration here */
 101         pinfo->brg = 2;
 102 }
 103
 104 void scc3_lineif(struct uart_cpm_port *pinfo)
 105 {
 106         /* XXX SCC3: insert port configuration here */
 107         pinfo->brg = 3;
 108 }
 109
 110 void scc4_lineif(struct uart_cpm_port *pinfo)
 111 {
 112         /* XXX SCC4: insert port configuration here */
 113         pinfo->brg = 4;
 114 }
 115
 116 /*
 117  * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
 118  * receive buffer descriptors from dual port ram, and a character
 119  * buffer area from host mem. If we are allocating for the console we need
 120  * to do it from bootmem
 121  */
 122 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 123 {
 124         int dpmemsz, memsz;
 125         u8 *dp_mem;
 126         uint dp_offset;
 127         u8 *mem_addr;
 128         dma_addr_t dma_addr = 0;
 129
 130         pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
 131
 132         dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
 133         dp_offset = cpm_dpalloc(dpmemsz, 8);
 134         if (IS_DPERR(dp_offset)) {
 135                 printk(KERN_ERR
 136                        "cpm_uart_cpm1.c: could not allocate buffer descriptors\n");
 137                 return -ENOMEM;
 138         }
 139         dp_mem = cpm_dpram_addr(dp_offset);
 140
 141         memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
 142             L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
 143         if (is_con) {
 144                 /* was hostalloc but changed cause it blows away the */
 145                 /* large tlb mapping when pinning the kernel area    */
 146                 mem_addr = (u8 *) cpm_dpram_addr(cpm_dpalloc(memsz, 8));
 147                 dma_addr = 0;
 148         } else
 149                 mem_addr = dma_alloc_coherent(NULL, memsz, &dma_addr,
 150                                               GFP_KERNEL);
 151
 152         if (mem_addr == NULL) {
 153                 cpm_dpfree(dp_offset);
 154                 printk(KERN_ERR
 155                        "cpm_uart_cpm1.c: could not allocate coherent memory\n");
 156                 return -ENOMEM;
 157         }
 158
 159         pinfo->dp_addr = dp_offset;
 160         pinfo->mem_addr = mem_addr;
 161         pinfo->dma_addr = dma_addr;
 162
 163         pinfo->rx_buf = mem_addr;
 164         pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
 165                                                        * pinfo->rx_fifosize);
 166
 167         pinfo->rx_bd_base = (volatile cbd_t *)dp_mem;
 168         pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
 169
 170         return 0;
 171 }
 172
 173 void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
 174 {
 175         dma_free_coherent(NULL, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
 176                                                pinfo->rx_fifosize) +
 177                           L1_CACHE_ALIGN(pinfo->tx_nrfifos *
 178                                          pinfo->tx_fifosize), pinfo->mem_addr,
 179                           pinfo->dma_addr);
 180
 181         cpm_dpfree(pinfo->dp_addr);
 182 }
 183
 184 /* Setup any dynamic params in the uart desc */
 185 int cpm_uart_init_portdesc(void)
 186 {
 187         pr_debug("CPM uart[-]:init portdesc\n");
 188
 189         cpm_uart_nr = 0;
 190 #ifdef CONFIG_SERIAL_CPM_SMC1
 191         cpm_uart_ports[UART_SMC1].smcp = &cpmp->cp_smc[0];
 192 /*
 193  *  Is SMC1 being relocated?
 194  */
 195 # ifdef CONFIG_I2C_SPI_SMC1_UCODE_PATCH
 196         cpm_uart_ports[UART_SMC1].smcup =
 197             (smc_uart_t *) & cpmp->cp_dparam[0x3C0];
 198 # else
 199         cpm_uart_ports[UART_SMC1].smcup =
 200             (smc_uart_t *) & cpmp->cp_dparam[PROFF_SMC1];
 201 # endif
 202         cpm_uart_ports[UART_SMC1].port.mapbase =
 203             (unsigned long)&cpmp->cp_smc[0];
 204         cpm_uart_ports[UART_SMC1].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
 205         cpm_uart_ports[UART_SMC1].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 206         cpm_uart_ports[UART_SMC1].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 207         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1;
 208 #endif
 209
 210 #ifdef CONFIG_SERIAL_CPM_SMC2
 211         cpm_uart_ports[UART_SMC2].smcp = &cpmp->cp_smc[1];
 212         cpm_uart_ports[UART_SMC2].smcup =
 213             (smc_uart_t *) & cpmp->cp_dparam[PROFF_SMC2];
 214         cpm_uart_ports[UART_SMC2].port.mapbase =
 215             (unsigned long)&cpmp->cp_smc[1];
 216         cpm_uart_ports[UART_SMC2].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
 217         cpm_uart_ports[UART_SMC2].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 218         cpm_uart_ports[UART_SMC2].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 219         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2;
 220 #endif
 221
 222 #ifdef CONFIG_SERIAL_CPM_SCC1
 223         cpm_uart_ports[UART_SCC1].sccp = &cpmp->cp_scc[0];
 224         cpm_uart_ports[UART_SCC1].sccup =
 225             (scc_uart_t *) & cpmp->cp_dparam[PROFF_SCC1];
 226         cpm_uart_ports[UART_SCC1].port.mapbase =
 227             (unsigned long)&cpmp->cp_scc[0];
 228         cpm_uart_ports[UART_SCC1].sccp->scc_sccm &=
 229             ~(UART_SCCM_TX | UART_SCCM_RX);
 230         cpm_uart_ports[UART_SCC1].sccp->scc_gsmrl &=
 231             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 232         cpm_uart_ports[UART_SCC1].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 233         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1;
 234 #endif
 235
 236 #ifdef CONFIG_SERIAL_CPM_SCC2
 237         cpm_uart_ports[UART_SCC2].sccp = &cpmp->cp_scc[1];
 238         cpm_uart_ports[UART_SCC2].sccup =
 239             (scc_uart_t *) & cpmp->cp_dparam[PROFF_SCC2];
 240         cpm_uart_ports[UART_SCC2].port.mapbase =
 241             (unsigned long)&cpmp->cp_scc[1];
 242         cpm_uart_ports[UART_SCC2].sccp->scc_sccm &=
 243             ~(UART_SCCM_TX | UART_SCCM_RX);
 244         cpm_uart_ports[UART_SCC2].sccp->scc_gsmrl &=
 245             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 246         cpm_uart_ports[UART_SCC2].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 247         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2;
 248 #endif
 249
 250 #ifdef CONFIG_SERIAL_CPM_SCC3
 251         cpm_uart_ports[UART_SCC3].sccp = &cpmp->cp_scc[2];
 252         cpm_uart_ports[UART_SCC3].sccup =
 253             (scc_uart_t *) & cpmp->cp_dparam[PROFF_SCC3];
 254         cpm_uart_ports[UART_SCC3].port.mapbase =
 255             (unsigned long)&cpmp->cp_scc[2];
 256         cpm_uart_ports[UART_SCC3].sccp->scc_sccm &=
 257             ~(UART_SCCM_TX | UART_SCCM_RX);
 258         cpm_uart_ports[UART_SCC3].sccp->scc_gsmrl &=
 259             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 260         cpm_uart_ports[UART_SCC3].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 261         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3;
 262 #endif
 263
 264 #ifdef CONFIG_SERIAL_CPM_SCC4
 265         cpm_uart_ports[UART_SCC4].sccp = &cpmp->cp_scc[3];
 266         cpm_uart_ports[UART_SCC4].sccup =
 267             (scc_uart_t *) & cpmp->cp_dparam[PROFF_SCC4];
 268         cpm_uart_ports[UART_SCC4].port.mapbase =
 269             (unsigned long)&cpmp->cp_scc[3];
 270         cpm_uart_ports[UART_SCC4].sccp->scc_sccm &=
 271             ~(UART_SCCM_TX | UART_SCCM_RX);
 272         cpm_uart_ports[UART_SCC4].sccp->scc_gsmrl &=
 273             ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 274         cpm_uart_ports[UART_SCC4].port.uartclk = (((bd_t *) __res)->bi_intfreq);
 275         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4;
 276 #endif
 277         return 0;
 278 }