drivers/ps2ser.c

   1 /***********************************************************************
   2  *
   3  * (C) Copyright 2004
   4  * DENX Software Engineering
   5  * Wolfgang Denk, wd@denx.de
   6  * All rights reserved.
   7  *
   8  * Simple 16550A serial driver
   9  *
  10  * Originally from linux source (drivers/char/ps2ser.c)
  11  *
  12  * Used by the PS/2 multiplexer driver (ps2mult.c)
  13  *
  14  ***********************************************************************/
  15
  16 #include <common.h>
  17
  18 #ifdef CONFIG_PS2SERIAL
  19
  20 #include <asm/io.h>
  21 #include <asm/atomic.h>
  22 #include <ps2mult.h>
  23 #if defined(CFG_NS16550) || defined(CONFIG_MPC85xx)
  24 #include <ns16550.h>
  25 #endif
  26
  27 DECLARE_GLOBAL_DATA_PTR;
  28
  29 /* #define      DEBUG */
  30
  31 #define PS2SER_BAUD     57600
  32
  33 #ifdef CONFIG_MPC5xxx
  34 #if CONFIG_PS2SERIAL == 1
  35 #define PSC_BASE MPC5XXX_PSC1
  36 #elif CONFIG_PS2SERIAL == 2
  37 #define PSC_BASE MPC5XXX_PSC2
  38 #elif CONFIG_PS2SERIAL == 3
  39 #define PSC_BASE MPC5XXX_PSC3
  40 #elif defined(CONFIG_MGT5100)
  41 #error CONFIG_PS2SERIAL must be in 1, 2 or 3
  42 #elif CONFIG_PS2SERIAL == 4
  43 #define PSC_BASE MPC5XXX_PSC4
  44 #elif CONFIG_PS2SERIAL == 5
  45 #define PSC_BASE MPC5XXX_PSC5
  46 #elif CONFIG_PS2SERIAL == 6
  47 #define PSC_BASE MPC5XXX_PSC6
  48 #else
  49 #error CONFIG_PS2SERIAL must be in 1 ... 6
  50 #endif
  51
  52 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
  53
  54 #if CONFIG_PS2SERIAL == 1
  55 #define COM_BASE (CFG_CCSRBAR+0x4500)
  56 #elif CONFIG_PS2SERIAL == 2
  57 #define COM_BASE (CFG_CCSRBAR+0x4600)
  58 #else
  59 #error CONFIG_PS2SERIAL must be in 1 ... 2
  60 #endif
  61
  62 #endif /* CONFIG_MPC5xxx / CONFIG_MPC8540 / other */
  63
  64 static int      ps2ser_getc_hw(void);
  65 static void     ps2ser_interrupt(void *dev_id);
  66
  67 extern struct   serial_state rs_table[]; /* in serial.c */
  68 #if !defined(CONFIG_MPC5xxx) && !defined(CONFIG_MPC8540) && !defined(CONFIG_MPC8541) && !defined(CONFIG_MPC8555)
  69 static struct   serial_state *state;
  70 #endif
  71
  72 static u_char   ps2buf[PS2BUF_SIZE];
  73 static atomic_t ps2buf_cnt;
  74 static int      ps2buf_in_idx;
  75 static int      ps2buf_out_idx;
  76
  77 #ifdef CONFIG_MPC5xxx
  78 int ps2ser_init(void)
  79 {
  80         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
  81         unsigned long baseclk;
  82         int div;
  83
  84         /* reset PSC */
  85         psc->command = PSC_SEL_MODE_REG_1;
  86
  87         /* select clock sources */
  88 #if defined(CONFIG_MGT5100)
  89         psc->psc_clock_select = 0xdd00;
  90         baseclk = (CFG_MPC5XXX_CLKIN + 16) / 32;
  91 #elif defined(CONFIG_MPC5200)
  92         psc->psc_clock_select = 0;
  93         baseclk = (gd->ipb_clk + 16) / 32;
  94 #endif
  95
  96         /* switch to UART mode */
  97         psc->sicr = 0;
  98
  99         /* configure parity, bit length and so on */
 100 #if defined(CONFIG_MGT5100)
 101         psc->mode = PSC_MODE_ERR | PSC_MODE_8_BITS | PSC_MODE_PARNONE;
 102 #elif defined(CONFIG_MPC5200)
 103         psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
 104 #endif
 105         psc->mode = PSC_MODE_ONE_STOP;
 106
 107         /* set up UART divisor */
 108         div = (baseclk + (PS2SER_BAUD/2)) / PS2SER_BAUD;
 109         psc->ctur = (div >> 8) & 0xff;
 110         psc->ctlr = div & 0xff;
 111
 112         /* disable all interrupts */
 113         psc->psc_imr = 0;
 114
 115         /* reset and enable Rx/Tx */
 116         psc->command = PSC_RST_RX;
 117         psc->command = PSC_RST_TX;
 118         psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;
 119
 120         return (0);
 121 }
 122
 123 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
 124 int ps2ser_init(void)
 125 {
 126         NS16550_t com_port = (NS16550_t)COM_BASE;
 127
 128         com_port->ier = 0x00;
 129         com_port->lcr = LCR_BKSE | LCR_8N1;
 130         com_port->dll = (CFG_NS16550_CLK / 16 / PS2SER_BAUD) & 0xff;
 131         com_port->dlm = ((CFG_NS16550_CLK / 16 / PS2SER_BAUD) >> 8) & 0xff;
 132         com_port->lcr = LCR_8N1;
 133         com_port->mcr = (MCR_DTR | MCR_RTS);
 134         com_port->fcr = (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR);
 135
 136         return (0);
 137 }
 138
 139 #else /* !CONFIG_MPC5xxx && !CONFIG_MPC8540 / other */
 140
 141 static inline unsigned int ps2ser_in(int offset)
 142 {
 143         return readb((unsigned long) state->iomem_base + offset);
 144 }
 145
 146 static inline void ps2ser_out(int offset, int value)
 147 {
 148         writeb(value, (unsigned long) state->iomem_base + offset);
 149 }
 150
 151 int ps2ser_init(void)
 152 {
 153         int quot;
 154         unsigned cval;
 155
 156         state = rs_table + CONFIG_PS2SERIAL;
 157
 158         quot = state->baud_base / PS2SER_BAUD;
 159         cval = 0x3; /* 8N1 - 8 data bits, no parity bits, 1 stop bit */
 160
 161           /* Set speed, enable interrupts, enable FIFO
 162            */
 163         ps2ser_out(UART_LCR, cval | UART_LCR_DLAB);
 164         ps2ser_out(UART_DLL, quot & 0xff);
 165         ps2ser_out(UART_DLM, quot >> 8);
 166         ps2ser_out(UART_LCR, cval);
 167         ps2ser_out(UART_IER, UART_IER_RDI);
 168         ps2ser_out(UART_MCR, UART_MCR_OUT2 | UART_MCR_DTR | UART_MCR_RTS);
 169         ps2ser_out(UART_FCR,
 170             UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
 171
 172         /* If we read 0xff from the LSR, there is no UART here
 173          */
 174         if (ps2ser_in(UART_LSR) == 0xff) {
 175                 printf ("ps2ser.c: no UART found\n");
 176                 return -1;
 177         }
 178
 179         irq_install_handler(state->irq, ps2ser_interrupt, NULL);
 180
 181         return 0;
 182 }
 183 #endif /* CONFIG_MPC5xxx / CONFIG_MPC8540 / other */
 184
 185 void ps2ser_putc(int chr)
 186 {
 187 #ifdef CONFIG_MPC5xxx
 188         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
 189 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
 190         NS16550_t com_port = (NS16550_t)COM_BASE;
 191 #endif
 192 #ifdef DEBUG
 193         printf(">>>> 0x%02x\n", chr);
 194 #endif
 195
 196 #ifdef CONFIG_MPC5xxx
 197         while (!(psc->psc_status & PSC_SR_TXRDY));
 198
 199         psc->psc_buffer_8 = chr;
 200 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
 201         while ((com_port->lsr & LSR_THRE) == 0);
 202         com_port->thr = chr;
 203 #else
 204         while (!(ps2ser_in(UART_LSR) & UART_LSR_THRE));
 205
 206         ps2ser_out(UART_TX, chr);
 207 #endif
 208 }
 209
 210 static int ps2ser_getc_hw(void)
 211 {
 212 #ifdef CONFIG_MPC5xxx
 213         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
 214 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
 215         NS16550_t com_port = (NS16550_t)COM_BASE;
 216 #endif
 217         int res = -1;
 218
 219 #ifdef CONFIG_MPC5xxx
 220         if (psc->psc_status & PSC_SR_RXRDY) {
 221                 res = (psc->psc_buffer_8);
 222         }
 223 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
 224         if (com_port->lsr & LSR_DR) {
 225                 res = com_port->rbr;
 226         }
 227 #else
 228         if (ps2ser_in(UART_LSR) & UART_LSR_DR) {
 229                 res = (ps2ser_in(UART_RX));
 230         }
 231 #endif
 232
 233         return res;
 234 }
 235
 236 int ps2ser_getc(void)
 237 {
 238         volatile int chr;
 239         int flags;
 240
 241 #ifdef DEBUG
 242         printf("<< ");
 243 #endif
 244
 245         flags = disable_interrupts();
 246
 247         do {
 248                 if (atomic_read(&ps2buf_cnt) != 0) {
 249                         chr = ps2buf[ps2buf_out_idx++];
 250                         ps2buf_out_idx &= (PS2BUF_SIZE - 1);
 251                         atomic_dec(&ps2buf_cnt);
 252                 } else {
 253                         chr = ps2ser_getc_hw();
 254                 }
 255         }
 256         while (chr < 0);
 257
 258         if (flags) enable_interrupts();
 259
 260 #ifdef DEBUG
 261         printf("0x%02x\n", chr);
 262 #endif
 263
 264         return chr;
 265 }
 266
 267 int ps2ser_check(void)
 268 {
 269         int flags;
 270
 271         flags = disable_interrupts();
 272         ps2ser_interrupt(NULL);
 273         if (flags) enable_interrupts();
 274
 275         return atomic_read(&ps2buf_cnt);
 276 }
 277
 278 static void ps2ser_interrupt(void *dev_id)
 279 {
 280 #ifdef CONFIG_MPC5xxx
 281         volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)PSC_BASE;
 282 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
 283         NS16550_t com_port = (NS16550_t)COM_BASE;
 284 #endif
 285         int chr;
 286         int status;
 287
 288         do {
 289                 chr = ps2ser_getc_hw();
 290 #ifdef CONFIG_MPC5xxx
 291                 status = psc->psc_status;
 292 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
 293                 status = com_port->lsr;
 294 #else
 295                 status = ps2ser_in(UART_IIR);
 296 #endif
 297                 if (chr < 0) continue;
 298
 299                 if (atomic_read(&ps2buf_cnt) < PS2BUF_SIZE) {
 300                         ps2buf[ps2buf_in_idx++] = chr;
 301                         ps2buf_in_idx &= (PS2BUF_SIZE - 1);
 302                         atomic_inc(&ps2buf_cnt);
 303                 } else {
 304                         printf ("ps2ser.c: buffer overflow\n");
 305                 }
 306 #ifdef CONFIG_MPC5xxx
 307         } while (status & PSC_SR_RXRDY);
 308 #elif defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || defined(CONFIG_MPC8555)
 309         } while (status & LSR_DR);
 310 #else
 311         } while (status & UART_IIR_RDI);
 312 #endif
 313
 314         if (atomic_read(&ps2buf_cnt)) {
 315                 ps2mult_callback(atomic_read(&ps2buf_cnt));
 316         }
 317 }
 318
 319 #endif /* CONFIG_PS2SERIAL */