mirror of
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861e756a76
* include/bsp.h, network/lan91c11x.c, network/lan91c11x.h, network/network.c, start/start.S, startup/bspstart.c, startup/exit.c, startup/linkcmds, startup/memmap.c: Correct license URL and/or fix mistake in copyright notice. Both of these mistakes appear to be from code submitted after these changes were made previously.
252 lines
8.0 KiB
C
252 lines
8.0 KiB
C
/*
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* Cogent CSB336 - MC9328MXL SBC startup code
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*
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* Copyright (c) 2004 by Cogent Computer Systems
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* Written by Jay Monkman <jtm@lopingdog.com>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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*
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#include <bsp.h>
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#include <rtems/libcsupport.h>
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#include <rtems/bspIo.h>
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#include <rtems/libio.h>
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#include <mc9328mxl.h>
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/* Global Variables */
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extern void *_flash_size;
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extern void *_flash_base;
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extern void *_sdram_size;
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extern void *_sdram_base;
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extern void *_bss_free_start;
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unsigned long free_mem_start;
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unsigned long free_mem_end;
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rtems_configuration_table BSP_Configuration;
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rtems_cpu_table Cpu_table;
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char *rtems_progname = "RTEMS";
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extern void rtems_irq_mngt_init(void);
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void bsp_libc_init( void *, uint32_t, int );
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void bsp_postdriver_hook(void);
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/**************************************************************************/
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/* */
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/* NAME: bsp_pretasking_hook - Function to setup system before startup */
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/* */
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/* DESCRIPTION: */
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/* This function is called before drivers are initialized and used */
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/* to setup libc and BSP extensions. */
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/* */
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/* RESTRICTIONS/LIMITATIONS: */
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/* Since this function is setting up libc, it cannot use and libc */
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/* functions. */
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/* */
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/**************************************************************************/
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void bsp_pretasking_hook(void)
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{
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uint32_t heap_start;
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uint32_t heap_size;
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/*
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* Set up the heap.
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*/
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heap_start = free_mem_start;
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heap_size = free_mem_end - free_mem_start;
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/* call rtems lib init - malloc stuff */
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bsp_libc_init((void *)heap_start, heap_size, 0);
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#ifdef RTEMS_DEBUG
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rtems_debug_enable(RTEMS_DEBUG_ALL_MASK);
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#endif /* RTEMS_DEBUG */
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}
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/**************************************************************************/
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/* */
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/* NAME: bsp_start_default - BSP initialization function */
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/* */
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/* DESCRIPTION: */
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/* This function is called before RTEMS is initialized and used */
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/* adjust the kernel's configuration. */
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/* */
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/* This function also configures the CPU's memory protection unit. */
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/* */
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/* RESTRICTIONS/LIMITATIONS: */
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/* Since RTEMS is not configured, no RTEMS functions can be called. */
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/* */
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/**************************************************************************/
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void mmu_set_cpu_async_mode(void);
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void bsp_start_default( void )
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{
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int i;
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/* Set the MCU prescaler to divide by 1 */
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MC9328MXL_PLL_CSCR &= ~MC9328MXL_PLL_CSCR_PRESC;
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/* Enable the MCU PLL */
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MC9328MXL_PLL_CSCR |= MC9328MXL_PLL_CSCR_MPEN;
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/* Delay to allow time for PLL to get going */
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for (i = 0; i < 100; i++) {
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asm volatile ("nop\n");
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}
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/* Set the CPU to asynchrous clock mode, so it uses its fastest clock */
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mmu_set_cpu_async_mode();
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/* disable interrupts */
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MC9328MXL_AITC_INTENABLEL = 0;
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MC9328MXL_AITC_INTENABLEH = 0;
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/* Set interrupt priority to -1 (allow all priorities) */
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MC9328MXL_AITC_NIMASK = 0x1f;
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/* tell rtems about the hooks we are using */
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Cpu_table.pretasking_hook = bsp_pretasking_hook;
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Cpu_table.postdriver_hook = bsp_postdriver_hook;
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/* tell rtems to clear the workspace by default */
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Cpu_table.do_zero_of_workspace = TRUE;
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/* Place RTEMS workspace at beginning of free memory. */
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BSP_Configuration.work_space_start = (void *)&_bss_free_start;
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free_mem_start = ((uint32_t)&_bss_free_start +
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BSP_Configuration.work_space_size);
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free_mem_end = ((uint32_t)&_sdram_base + (uint32_t)&_sdram_size);
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/*
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* Init rtems exceptions management
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*/
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rtems_exception_init_mngt();
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/*
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* Init rtems interrupt management
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*/
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rtems_irq_mngt_init();
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/*
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* The following information is very useful when debugging.
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*/
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#if 0
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printk( "work_space_size = 0x%x\n",
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BSP_Configuration.work_space_size );
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printk( "maximum_extensions = 0x%x\n",
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BSP_Configuration.maximum_extensions );
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printk( "microseconds_per_tick = 0x%x\n",
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BSP_Configuration.microseconds_per_tick );
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printk( "ticks_per_timeslice = 0x%x\n",
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BSP_Configuration.ticks_per_timeslice );
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printk( "maximum_devices = 0x%x\n",
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BSP_Configuration.maximum_devices );
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printk( "number_of_device_drivers = 0x%x\n",
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BSP_Configuration.number_of_device_drivers );
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printk( "Device_driver_table = 0x%x\n",
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BSP_Configuration.Device_driver_table );
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printk( "work_space_start = 0x%x\n",
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BSP_Configuration.work_space_start );
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printk( "work_space_size = 0x%x\n",
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BSP_Configuration.work_space_size );
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#endif
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} /* bsp_start */
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/* Calcuate the frequency for perclk1 */
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int get_perclk1_freq(void)
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{
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unsigned int fin;
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unsigned int fpll;
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unsigned int pd;
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unsigned int mfd;
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unsigned int mfi;
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unsigned int mfn;
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uint32_t reg;
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int perclk1;
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if (MC9328MXL_PLL_CSCR & MC9328MXL_PLL_CSCR_SYSSEL) {
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/* Use external oscillator */
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fin = BSP_OSC_FREQ;
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} else {
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/* Use scaled xtal freq */
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fin = BSP_XTAL_FREQ * 512;
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}
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/* calculate the output of the system PLL */
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reg = MC9328MXL_PLL_SPCTL0;
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pd = ((reg & MC9328MXL_PLL_SPCTL_PD_MASK) >>
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MC9328MXL_PLL_SPCTL_PD_SHIFT);
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mfd = ((reg & MC9328MXL_PLL_SPCTL_MFD_MASK) >>
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MC9328MXL_PLL_SPCTL_MFD_SHIFT);
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mfi = ((reg & MC9328MXL_PLL_SPCTL_MFI_MASK) >>
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MC9328MXL_PLL_SPCTL_MFI_SHIFT);
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mfn = ((reg & MC9328MXL_PLL_SPCTL_MFN_MASK) >>
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MC9328MXL_PLL_SPCTL_MFN_SHIFT);
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#if 0
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printk("fin = %d\n", fin);
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printk("pd = %d\n", pd);
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printk("mfd = %d\n", mfd);
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printk("mfi = %d\n", mfi);
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printk("mfn = %d\n", mfn);
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printk("rounded (fin * mfi) / (pd + 1) = %d\n", (fin * mfi) / (pd + 1));
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printk("rounded (fin * mfn) / ((pd + 1) * (mfd + 1)) = %d\n",
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((long long)fin * mfn) / ((pd + 1) * (mfd + 1)));
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#endif
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fpll = 2 * ( ((fin * mfi + (pd + 1) / 2) / (pd + 1)) +
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(((long long)fin * mfn + ((pd + 1) * (mfd + 1)) / 2) /
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((pd + 1) * (mfd + 1))) );
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/* calculate the output of the PERCLK1 divider */
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reg = MC9328MXL_PLL_PCDR;
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perclk1 = fpll / (1 + ((reg & MC9328MXL_PLL_PCDR_PCLK1_MASK) >>
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MC9328MXL_PLL_PCDR_PCLK1_SHIFT));
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return perclk1;
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}
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/*
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* By making this a weak alias for bsp_start_default, a brave soul
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* can override the actual bsp_start routine used.
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*/
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void bsp_start (void) __attribute__ ((weak, alias("bsp_start_default")));
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/**
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* Reset the system.
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*
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* This functions enables the watchdog and waits for it to
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* fire, thus resetting the system.
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*/
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/**
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* Reset the system.
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*
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* This functions enables the watchdog and waits for it to
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* fire, thus resetting the system.
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*/
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void bsp_reset(void)
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{
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rtems_interrupt_level level;
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_CPU_ISR_Disable(level);
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printk("\n\rI should reset here.\n\r");
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while(1);
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}
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