Das U-Boot: Universal Boot Loader

diff --git a/common/cmd_spi.c b/common/cmd_spi.c
new file mode 100644 (file)
index 0000000..ccf9cc2
--- /dev/null
+++ b/common/cmd_spi.c
@@ -0,0 +1,116 @@
+/*
+ * (C) Copyright 2002
+ * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * SPI Read/Write Utilities
+ */
+
+#include <common.h>
+#include <command.h>
+#include <spi.h>
+#include <cmd_spi.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_SPI)
+
+#define MAX_SPI_BYTES  32      /* max number of bytes we can handle */
+
+/*
+ * External table of chip select functions (see the appropriate board
+ * support for the actual definition of the table).
+ */
+extern spi_chipsel_type spi_chipsel[];
+
+
+/*
+ * Values from last command.
+ */
+static int   device;
+static int   bitlen;
+static uchar dout[MAX_SPI_BYTES];
+static uchar din[MAX_SPI_BYTES];
+
+/*
+ * SPI read/write
+ *
+ * Syntax:
+ *   spi {dev} {num_bits} {dout}
+ *     {dev} is the device number for controlling chip select (see TBD)
+ *     {num_bits} is the number of bits to send & receive (base 10)
+ *     {dout} is a hexadecimal string of data to send
+ * The command prints out the hexadecimal string received via SPI.
+ */
+
+int do_spi (cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
+{
+       char  *cp = 0;
+       uchar tmp;
+       int   j;
+       int   rcode = 0;
+
+       /*
+        * We use the last specified parameters, unless new ones are
+        * entered.
+        */
+
+       if ((flag & CMD_FLAG_REPEAT) == 0)
+       {
+               if (argc >= 2)
+                       device = simple_strtoul(argv[1], NULL, 10);
+               if (argc >= 3)
+                       bitlen = simple_strtoul(argv[2], NULL, 10);
+               if (argc >= 4)
+               cp = argv[3];
+               for(j = 0; *cp; j++, cp++) {
+                       tmp = *cp - '0';
+                       if(tmp > 9)
+                               tmp -= ('A' - '0') - 10;
+                       if(tmp > 15)
+                               tmp -= ('a' - 'A');
+                       if(tmp > 15) {
+                               printf("Conversion error on %c, bailing out.\n", *cp);
+                               break;
+                       }
+                       if((j % 2) == 0)
+                               dout[j / 2] = (tmp << 4);
+                       else
+                               dout[j / 2] |= tmp;
+               }
+       }
+
+printf("spi_chipsel[%d] = %08X\n", device, (uint)spi_chipsel[device]);
+       if(spi_xfer(spi_chipsel[device], bitlen, dout, din) != 0) {
+               printf("Error with the SPI transaction.\n");
+               rcode = 1;
+       } else {
+               cp = din;
+               for(j = 0; j < ((bitlen + 7) / 8); j++) {
+                       printf("%02X", *cp++);
+               }
+               printf("\n");
+       }
+
+       return rcode;
+}
+
+#endif /* CFG_CMD_SPI */
+

diff --git a/common/soft_spi.c b/common/soft_spi.c
new file mode 100644 (file)
index 0000000..a5b62f2
--- /dev/null
+++ b/common/soft_spi.c
@@ -0,0 +1,138 @@
+/*
+ * (C) Copyright 2002
+ * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
+ *
+ * Influenced by code from:
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <spi.h>
+
+#if defined(CONFIG_SOFT_SPI)
+
+#define DEBUG_SPI
+
+
+/*-----------------------------------------------------------------------
+ * Definitions
+ */
+
+#ifdef DEBUG_SPI
+#define PRINTD(fmt,args...)    printf (fmt ,##args)
+#else
+#define PRINTD(fmt,args...)
+#endif
+
+
+
+/*=====================================================================*/
+/*                         Public Functions                            */
+/*=====================================================================*/
+
+/*-----------------------------------------------------------------------
+ * Initialization
+ */
+void spi_init (void)
+{
+#ifdef SPI_INIT
+       volatile immap_t *immr = (immap_t *)CFG_IMMR;
+
+       SPI_INIT;
+#endif
+}
+
+
+/*-----------------------------------------------------------------------
+ * SPI transfer
+ *
+ * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
+ * "bitlen" bits in the SPI MISO port.  That's just the way SPI works.
+ *
+ * The source of the outgoing bits is the "dout" parameter and the
+ * destination of the input bits is the "din" parameter.  Note that "dout"
+ * and "din" can point to the same memory location, in which case the
+ * input data overwrites the output data (since both are buffered by
+ * temporary variables, this is OK).
+ *
+ * If the chipsel() function is not NULL, it is called with a parameter
+ * of '1' (chip select active) at the start of the transfer and again with
+ * a parameter of '0' at the end of the transfer.
+ *
+ * If the chipsel() function _is_ NULL, it the responsibility of the
+ * caller to make the appropriate chip select active before calling
+ * spi_xfer() and making it inactive after spi_xfer() returns.
+ */
+int  spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din)
+{
+       volatile immap_t *immr = (immap_t *)CFG_IMMR;
+       uchar tmpdin  = 0;
+       uchar tmpdout = 0;
+       int   j;
+
+       PRINTD("spi_xfer: chipsel %08X dout %08X din %08X bitlen %d\n",
+               (int)chipsel, *(uint *)dout, *(uint *)din, bitlen);
+
+       if(chipsel != NULL) {
+               (*chipsel)(1);  /* select the target chip */
+       }
+
+       for(j = 0; j < bitlen; j++) {
+               /*
+                * Check if it is time to work on a new byte.
+                */
+               if((j % 8) == 0) {
+                       tmpdout = *dout++;
+                       if(j != 0) {
+                               *din++ = tmpdin;
+                       }
+                       tmpdin  = 0;
+               }
+               SPI_SCL(0);
+               SPI_SDA(tmpdout & 0x80);
+               SPI_DELAY;
+               SPI_SCL(1);
+               SPI_DELAY;
+               tmpdin  <<= 1;
+               tmpdin   |= SPI_READ;
+               tmpdout <<= 1;
+       }
+       /*
+        * If the number of bits isn't a multiple of 8, shift the last
+        * bits over to left-justify them.  Then store the last byte
+        * read in.
+        */
+       if((bitlen % 8) != 0)
+               tmpdin <<= 8 - (bitlen % 8);
+       *din++ = tmpdin;
+
+       SPI_SCL(0);             /* SPI wants the clock left low for idle */
+
+       if(chipsel != NULL) {
+               (*chipsel)(0);  /* deselect the target chip */
+
+       }
+
+       return(0);
+}
+
+#endif /* CONFIG_SOFT_SPI */
+

diff --git a/cpu/mpc8260/status_led.c b/cpu/mpc8260/status_led.c
new file mode 100644 (file)
index 0000000..0174e39
--- /dev/null
+++ b/cpu/mpc8260/status_led.c
@@ -0,0 +1,160 @@
+/*
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.         See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <status_led.h>
+
+/*
+ * The purpose of this code is to signal the operational status of a
+ * target which usually boots over the network; while running in
+ * PCBoot, a status LED is blinking. As soon as a valid BOOTP reply
+ * message has been received, the LED is turned off. The Linux
+ * kernel, once it is running, will start blinking the LED again,
+ * with another frequency.
+ */
+
+/* ------------------------------------------------------------------------- */
+
+#ifdef CONFIG_STATUS_LED
+
+typedef struct {
+       ulong   mask;
+       int     state;
+       int     period;
+       int     cnt;
+} led_dev_t;
+
+led_dev_t led_dev[] = {
+    {  STATUS_LED_BIT,
+       STATUS_LED_STATE,
+       STATUS_LED_PERIOD,
+       0,
+    },
+#if defined(STATUS_LED_BIT1)
+    {  STATUS_LED_BIT1,
+       STATUS_LED_STATE1,
+       STATUS_LED_PERIOD1,
+       0,
+    },
+#endif
+#if defined(STATUS_LED_BIT2)
+    {  STATUS_LED_BIT2,
+       STATUS_LED_STATE2,
+       STATUS_LED_PERIOD2,
+       0,
+    },
+#endif
+};
+
+#define MAX_LED_DEV    (sizeof(led_dev)/sizeof(led_dev_t))
+
+static int status_led_init_done = 0;
+
+static void status_led_init (void)
+{
+    volatile immap_t *immr = (immap_t *)CFG_IMMR;
+    int i;
+
+    for (i=0; i<MAX_LED_DEV; ++i) {
+       led_dev_t *ld = &led_dev[i];
+
+       immr->STATUS_LED_PAR &= ~(ld->mask);
+#ifdef STATUS_LED_ODR
+       immr->STATUS_LED_ODR &= ~(ld->mask);
+#endif
+#if (STATUS_LED_ACTIVE == 0)
+       if (ld->state == STATUS_LED_ON)
+               immr->STATUS_LED_DAT &= ~(ld->mask);
+       else
+               immr->STATUS_LED_DAT |=   ld->mask ;
+#else
+       if (ld->state == STATUS_LED_ON)
+               immr->STATUS_LED_DAT |=   ld->mask ;
+       else
+               immr->STATUS_LED_DAT &= ~(ld->mask);
+#endif
+       immr->STATUS_LED_DIR |=   ld->mask ;
+    }
+
+    status_led_init_done  = 1;
+}
+
+void status_led_tick (ulong timestamp)
+{
+    volatile immap_t *immr = (immap_t *)CFG_IMMR;
+    int i;
+
+    if (!status_led_init_done)
+       status_led_init();
+
+    for (i=0; i<MAX_LED_DEV; ++i) {
+       led_dev_t *ld = &led_dev[i];
+
+       if (ld->state != STATUS_LED_BLINKING)
+               continue;
+
+       if (++(ld->cnt) >= ld->period) {
+               immr->STATUS_LED_DAT ^= ld->mask;
+               ld->cnt -= ld->period;
+       }
+    }
+}
+
+void status_led_set (int led, int state)
+{
+    volatile immap_t *immr = (immap_t *)CFG_IMMR;
+    led_dev_t *ld;
+
+    if (led < 0 || led >= MAX_LED_DEV)
+       return;
+
+    if (!status_led_init_done)
+       status_led_init();
+
+    ld = &led_dev[led];
+
+    switch (state) {
+    default:
+       return;
+    case STATUS_LED_BLINKING:
+       ld->cnt = 0;            /* always start with full period        */
+       /* fall through */      /* always start with LED _ON_           */
+    case STATUS_LED_ON:
+#if (STATUS_LED_ACTIVE == 0)
+       immr->STATUS_LED_DAT &= ~(ld->mask);
+#else
+       immr->STATUS_LED_DAT |=   ld->mask ;
+#endif
+       break;
+    case STATUS_LED_OFF:
+#if (STATUS_LED_ACTIVE == 0)
+       immr->STATUS_LED_DAT |=   ld->mask ;
+#else
+       immr->STATUS_LED_DAT &= ~(ld->mask);
+#endif
+       break;
+    }
+    ld->state = state;
+}
+
+#endif /* CONFIG_STATUS_LED */