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Blackfin: use on-chip reset func with newer parts

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Turns out the documentation is wrong and doing "RAISE 1" does not result
in a software reset, only a core reset.  So when the on-chip rom has a
functioning reset helper, use it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2011-05-02 00:00:35 -04:00
parent f91c69168a
commit 803103925b
1 changed files with 31 additions and 34 deletions
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65
arch/blackfin/kernel/reboot.c
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@ -23,6 +23,9 @@
__attribute__ ((__l1_text__, __noreturn__))
static void bfin_reset(void)
{
if (!ANOMALY_05000353 && !ANOMALY_05000386)
bfrom_SoftReset((void *)(L1_SCRATCH_START + L1_SCRATCH_LENGTH - 20));
/* Wait for completion of "system" events such as cache line
* line fills so that we avoid infinite stalls later on as
* much as possible. This code is in L1, so it won't trigger
@ -30,46 +33,40 @@ static void bfin_reset(void)
*/
__builtin_bfin_ssync();
/* The bootrom checks to see how it was reset and will
* automatically perform a software reset for us when
* it starts executing after the core reset.
/* Initiate System software reset. */
bfin_write_SWRST(0x7);
/* Due to the way reset is handled in the hardware, we need
* to delay for 10 SCLKS. The only reliable way to do this is
* to calculate the CCLK/SCLK ratio and multiply 10. For now,
* we'll assume worse case which is a 1:15 ratio.
*/
if (ANOMALY_05000353 || ANOMALY_05000386) {
/* Initiate System software reset. */
bfin_write_SWRST(0x7);
asm(
"LSETUP (1f, 1f) LC0 = %0\n"
"1: nop;"
:
: "a" (15 * 10)
: "LC0", "LB0", "LT0"
);
/* Due to the way reset is handled in the hardware, we need
* to delay for 10 SCLKS. The only reliable way to do this is
* to calculate the CCLK/SCLK ratio and multiply 10. For now,
* we'll assume worse case which is a 1:15 ratio.
*/
asm(
"LSETUP (1f, 1f) LC0 = %0\n"
"1: nop;"
:
: "a" (15 * 10)
: "LC0", "LB0", "LT0"
);
/* Clear System software reset */
bfin_write_SWRST(0);
/* Clear System software reset */
bfin_write_SWRST(0);
/* The BF526 ROM will crash during reset */
/* The BF526 ROM will crash during reset */
#if defined(__ADSPBF522__) || defined(__ADSPBF524__) || defined(__ADSPBF526__)
bfin_read_SWRST();
bfin_read_SWRST();
#endif
/* Wait for the SWRST write to complete. Cannot rely on SSYNC
* though as the System state is all reset now.
*/
asm(
"LSETUP (1f, 1f) LC1 = %0\n"
"1: nop;"
:
: "a" (15 * 1)
: "LC1", "LB1", "LT1"
);
}
/* Wait for the SWRST write to complete. Cannot rely on SSYNC
* though as the System state is all reset now.
*/
asm(
"LSETUP (1f, 1f) LC1 = %0\n"
"1: nop;"
:
: "a" (15 * 1)
: "LC1", "LB1", "LT1"
);
while (1)
/* Issue core reset */