svn commit: r344577 - head/sys/arm64/rockchip/clk
Emmanuel Vadot
manu at FreeBSD.org
Tue Feb 26 13:15:32 UTC 2019
Author: manu
Date: Tue Feb 26 13:15:31 2019
New Revision: 344577
URL: https://svnweb.freebsd.org/changeset/base/344577
Log:
arm64: rockchip: clk: ARM CLK improvement
RockChip clocks register have a write mask in the upper 16 bits, if a 1
is present the corresponding bit in the lower 16 ones is set.
Use this instead of always setting the mask to 0xFFFF0000.
This avoids a read of the register.
While here set the parent after changing its freqeuncy, this reduce the time
between changing the parent and changing the divider for the arm clock.
MFC after: 1 week
Modified:
head/sys/arm64/rockchip/clk/rk_clk_armclk.c
head/sys/arm64/rockchip/clk/rk_clk_armclk.h
Modified: head/sys/arm64/rockchip/clk/rk_clk_armclk.c
==============================================================================
--- head/sys/arm64/rockchip/clk/rk_clk_armclk.c Tue Feb 26 13:14:49 2019 (r344576)
+++ head/sys/arm64/rockchip/clk/rk_clk_armclk.c Tue Feb 26 13:15:31 2019 (r344577)
@@ -72,8 +72,11 @@ struct rk_clk_armclk_sc {
#define DEVICE_UNLOCK(_clk) \
CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
-#define RK_ARMCLK_WRITE_MASK 0xFFFF0000
+#define RK_ARMCLK_WRITE_MASK_SHIFT 16
+/* #define dprintf(format, arg...) printf("%s:(%s)" format, __func__, clknode_get_name(clk), arg) */
+#define dprintf(format, arg...)
+
static int
rk_clk_armclk_init(struct clknode *clk, device_t dev)
{
@@ -98,14 +101,15 @@ static int
rk_clk_armclk_set_mux(struct clknode *clk, int index)
{
struct rk_clk_armclk_sc *sc;
- uint32_t val;
+ uint32_t val = 0;
sc = clknode_get_softc(clk);
+ dprintf("Set mux to %d\n", index);
DEVICE_LOCK(clk);
- READ4(clk, sc->muxdiv_offset, &val);
- val &= ~(sc->mux_mask >> sc->mux_shift);
- val |= index << sc->mux_shift | RK_ARMCLK_WRITE_MASK;
+ val |= index << sc->mux_shift;
+ val |= sc->mux_mask << RK_ARMCLK_WRITE_MASK_SHIFT;
+ dprintf("Write: muxdiv_offset=%x, val=%x\n", sc->muxdiv_offset, val);
WRITE4(clk, sc->muxdiv_offset, val);
DEVICE_UNLOCK(clk);
@@ -123,10 +127,12 @@ rk_clk_armclk_recalc(struct clknode *clk, uint64_t *fr
DEVICE_LOCK(clk);
READ4(clk, sc->muxdiv_offset, ®);
+ dprintf("Read: muxdiv_offset=%x, val=%x\n", sc->muxdiv_offset, reg);
DEVICE_UNLOCK(clk);
div = ((reg & sc->div_mask) >> sc->div_shift) + 1;
+ dprintf("parent_freq=%lu, div=%u\n", *freq, div);
*freq = *freq / div;
@@ -141,14 +147,14 @@ rk_clk_armclk_set_freq(struct clknode *clk, uint64_t f
struct clknode *p_main;
const char **p_names;
uint64_t best = 0, best_p = 0;
- uint32_t div = 0, val;
+ uint32_t div = 0, val = 0;
int err, i, rate = 0;
sc = clknode_get_softc(clk);
+ dprintf("Finding best parent/div for target freq of %lu\n", *fout);
p_names = clknode_get_parent_names(clk);
p_main = clknode_find_by_name(p_names[sc->main_parent]);
- clknode_set_parent_by_idx(clk, sc->main_parent);
for (i = 0; i < sc->nrates; i++) {
if (sc->rates[i].freq == *fout) {
@@ -156,6 +162,10 @@ rk_clk_armclk_set_freq(struct clknode *clk, uint64_t f
div = sc->rates[i].div;
best_p = best * div;
rate = i;
+ dprintf("Best parent %s (%d) with best freq at %lu\n",
+ clknode_get_name(p_main),
+ sc->main_parent,
+ best);
break;
}
}
@@ -169,17 +179,22 @@ rk_clk_armclk_set_freq(struct clknode *clk, uint64_t f
return (0);
}
+ dprintf("Changing parent (%s) freq to %lu\n", clknode_get_name(p_main), best_p);
err = clknode_set_freq(p_main, best_p, 0, 1);
if (err != 0)
printf("Cannot set %s to %lu\n",
clknode_get_name(p_main),
best_p);
+ clknode_set_parent_by_idx(clk, sc->main_parent);
+
+ clknode_get_freq(p_main, &best_p);
+ dprintf("main parent freq at %lu\n", best_p);
DEVICE_LOCK(clk);
- READ4(clk, sc->muxdiv_offset, &val);
- val &= ~sc->div_mask;
val |= (div - 1) << sc->div_shift;
- WRITE4(clk, sc->muxdiv_offset, val | RK_CLK_ARMCLK_MASK);
+ val |= sc->div_mask << RK_ARMCLK_WRITE_MASK_SHIFT;
+ dprintf("Write: muxdiv_offset=%x, val=%x\n", sc->muxdiv_offset, val);
+ WRITE4(clk, sc->muxdiv_offset, val);
DEVICE_UNLOCK(clk);
*fout = best;
Modified: head/sys/arm64/rockchip/clk/rk_clk_armclk.h
==============================================================================
--- head/sys/arm64/rockchip/clk/rk_clk_armclk.h Tue Feb 26 13:14:49 2019 (r344576)
+++ head/sys/arm64/rockchip/clk/rk_clk_armclk.h Tue Feb 26 13:15:31 2019 (r344577)
@@ -58,8 +58,6 @@ struct rk_clk_armclk_def {
int nrates;
};
-#define RK_CLK_ARMCLK_MASK 0xFFFF0000
-
int rk_clk_armclk_register(struct clkdom *clkdom,
struct rk_clk_armclk_def *clkdef);
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