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cpg: add spread spectrum control

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Disables spread spectrum by default so that the frequency estimations of
the CPG driver (notably used by the timer driver and libprof) are more
accurate.
This commit is contained in:
Lephe 2020-07-20 17:10:47 +02:00
parent bf21246f13
commit 6c535bf7df
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GPG key ID: 1BBA026E13FC0495
3 changed files with 39 additions and 11 deletions
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7
TODO
View file

@ -3,17 +3,11 @@ For the 2.1.0 release:
* project: remove the compat branch
* project: remove the gray aliases
Issues:
* #10 support fx-CG 20
Extensions on existing code:
* tmu: make interrupt handlers more elegant
* bopti: try to display fullscreen images with TLB access + DMA on fxcg50
* topti: support unicode fonts
* dma: fx9860g support (need to switch it on and update the Makefile)
* core: try to leave add-in without reset in case of panic
* hardware: fill in the HWMEM_FITTLB flag
* cpg: spread spectrum on fxcg50
* core: use cmp/str for memchr()
* r61524: brightness control and clean the file
* core: review forgotten globals and MPU addresses not in <gint/mpu/*.h>
@ -21,6 +15,7 @@ Extensions on existing code:
* core: run destructors when a task-switch results in leaving the app
* core: invoke main menu instead of returning after main() ends
* core rtc: use qdiv10 to massively improve division performance
* topti: let the font specify letter and word spacing
Future directions.
* A complete file system abstraction

9
include/gint/mpu/cpg.h
View file

@ -65,8 +65,13 @@ typedef volatile struct
uint32_t CKOFF :1; /* CKO Output Stop */
uint32_t :1;
);
/* TODO: CPG: Add the SSCGCR register */
pad(0x28);
pad(0x1c);
lword_union(SSCGCR,
uint32_t SSEN :1; /* Spread Spectrum Enable */
uint32_t :31;
);
pad(0x8);
lword_union(FLLFRQ,
uint32_t :16;

34
src/cpg/cpg.c
View file

@ -113,11 +113,17 @@ static void sh7305_probe(void)
#undef CPG
//---
// Other driver stuff
// Initialization, contexts and driver metadata
//---
static void init(void)
{
/* Disable spread spectrum in SSGSCR */
if(isSH4())
{
SH7305_CPG.SSCGCR.SSEN = 0;
}
/* This avoids warnings about sh7705_probe() being undefined when
building for fxcg50 */
#if defined(FX9860G) || (!defined(FX9860G) && !defined(FXCG50))
@ -126,9 +132,31 @@ static void init(void)
sh7305_probe();
}
typedef struct {
uint32_t SSCGCR;
} ctx_t;
static ctx_t sys_ctx, gint_ctx;
static void ctx_save(void *ctx)
{
ctx_t *c = ctx;
if(isSH4()) c->SSCGCR = SH7305_CPG.SSCGCR.lword;
}
static void ctx_restore(void *ctx)
{
ctx_t *c = ctx;
if(isSH4()) SH7305_CPG.SSCGCR.lword = c->SSCGCR;
}
gint_driver_t drv_cpg = {
.name = "CPG",
.init = init,
.name = "CPG",
.init = init,
.sys_ctx = &sys_ctx,
.gint_ctx = &gint_ctx,
.ctx_save = ctx_save,
.ctx_restore = ctx_restore,
};
GINT_DECLARE_DRIVER(1, drv_cpg);