mirror of
https://github.com/AsahiLinux/u-boot
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8bde7f776c
- remove trailing white space, trailing empty lines, C++ comments, etc.
- split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c)
* Patches by Kenneth Johansson, 25 Jun 2003:
- major rework of command structure
(work done mostly by Michal Cendrowski and Joakim Kristiansen)
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| .. | ||
| epic.h | ||
| epic1.c | ||
| epic2.S | ||
| epicutil.S | ||
| README | ||
CONTENT: epic.h epic1.c epic2.s WHAT ARE THESE FILES: These files contain MPC8240 (Kahlua) EPIC driver routines. The driver routines are not written for any specific operating system. They serves the purpose of code sample, and jump-start for using the MPC8240 EPIC unit. For the reason of correctness of C language syntax, these files are compiled by Metaware C compiler and assembler. ENDIAN NOTATION: The algorithm is designed for big-endian mode, software is responsible for byte swapping. USAGE: 1. The host system that is running on MPC8240 shall link the files listed here. The memory location of driver routines shall take into account of that driver routines need to run in supervisor mode and they process external interrupts. The routine epic_exception shall be called by exception vector at location 0x500, i.e., 603e core external exception vector. 2. The host system is responsible for configuring the MPC8240 including Embedded Utilities Memory Block. All EPIC driver functions require the content of Embedded Utilities Memory Block Base Address Register, EUMBBAR, as the first parameter. 3. Before EPIC unit of MPC8240 can be used, initialize EPIC unit by calling epicInit with the corresponding parameters. The initialization shall disable the 603e core External Exception by calling CoreExtIntDisable( ). Next, call epicInit( ). Last, enable the 603e core External Exception by calling CoreExtIntEnable( ). 4. After EPIC unit has been successfully initialized, epicIntSourceSet( ) shall be used to register each external interrupt source. Anytime, an external interrupt source can be disabled or enabled by calling corresponding function, epicIntDisable( ), or epicIntEnable( ). Global Timers' resource, base count and frequency, can be changed by calling epicTmFrequencySet( ) and epicTmBaseSet( ). To stop counting a specific global timer, use the function, epicTmInhibit while epicTmEnable can be used to start counting a timer. 5. To mask a set of external interrupts that are are certain level below, epicIntPrioritySet( ) can be used. For example, if the processor's current task priority register is set to 0x7, only interrupts of priority 0x8 or higher will be passed to the processor. Be careful when using this function. It may corrupt the current interrupt pending, selector, and request registers, resulting an invalid vetor. After enabling an interrupt, disable it may also cause an invalid vector. User may consider using the spurious vector interrupt service routine to handle this case. 6. The EPIC driver routines contains a set of utilities, Set and Get, for host system to query and modify the desired EPIC source registers. 7. Each external interrupt source shall register its interrupt service routine. The routine shall contain all interrupt source specific processes and keep as short as possible. Special customized end of interrupt routine is optional. If it is needed, it shall contain the external interrupt source specific end of interrupt process. External interrupt exception vector at 0x500 shall always call the epicEOI just before rfi instruction. Refer to the routine, epic_exception, for a code sample.