[PATCHv1 03/19] clk: rockchip: add pll type for RK3588
Sebastian Reichel
sebastian.reichel at collabora.com
Fri Apr 22 10:09:04 PDT 2022
From: Elaine Zhang <zhangqing at rock-chips.com>
Add RK3588 PLL support including calculation of PLL parameters
for arbitrary frequencies.
Signed-off-by: Elaine Zhang <zhangqing at rock-chips.com>
[rebase and partially rewrite code]
Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
---
drivers/clk/rockchip/clk-pll.c | 287 ++++++++++++++++++++++++++++++++-
drivers/clk/rockchip/clk.h | 18 +++
2 files changed, 304 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/rockchip/clk-pll.c b/drivers/clk/rockchip/clk-pll.c
index f7827b3b7fc1..010e47eb51b8 100644
--- a/drivers/clk/rockchip/clk-pll.c
+++ b/drivers/clk/rockchip/clk-pll.c
@@ -15,6 +15,7 @@
#include <linux/iopoll.h>
#include <linux/regmap.h>
#include <linux/clk.h>
+#include <linux/units.h>
#include "clk.h"
#define PLL_MODE_MASK 0x3
@@ -47,6 +48,67 @@ struct rockchip_clk_pll {
#define to_rockchip_clk_pll_nb(nb) \
container_of(nb, struct rockchip_clk_pll, clk_nb)
+static int
+rockchip_rk3588_get_pll_settings(struct rockchip_clk_pll *pll,
+ unsigned long fin_hz,
+ unsigned long fout_hz,
+ struct rockchip_pll_rate_table *rate_table)
+{
+ u64 fvco_min = 2250 * HZ_PER_MHZ, fvco_max = 4500 * HZ_PER_MHZ;
+ u64 fout_min = 37 * HZ_PER_MHZ, fout_max = 4500 * HZ_PER_MHZ;
+ u32 p, m, s;
+ u64 fvco, fref, fout, ffrac;
+
+ if (fin_hz == 0 || fout_hz == 0 || fout_hz == fin_hz)
+ return -EINVAL;
+
+ if (fout_hz > fout_max || fout_hz < fout_min)
+ return -EINVAL;
+
+ if (fin_hz / HZ_PER_MHZ * HZ_PER_MHZ == fin_hz &&
+ fout_hz / HZ_PER_MHZ * HZ_PER_MHZ == fout_hz) {
+ for (s = 0; s <= 6; s++) {
+ fvco = fout_hz << s;
+ if (fvco < fvco_min || fvco > fvco_max)
+ continue;
+ for (p = 2; p <= 4; p++) {
+ for (m = 64; m <= 1023; m++) {
+ if (fvco == m * fin_hz / p) {
+ rate_table->p = p;
+ rate_table->m = m;
+ rate_table->s = s;
+ rate_table->k = 0;
+ return 0;
+ }
+ }
+ }
+ }
+ } else {
+ fout = (fout_hz / HZ_PER_MHZ) * HZ_PER_MHZ;
+ ffrac = (fout_hz % HZ_PER_MHZ);
+ for (s = 0; s <= 6; s++) {
+ fvco = fout << s;
+ if (fvco < fvco_min || fvco > fvco_max)
+ continue;
+ for (p = 1; p <= 4; p++) {
+ for (m = 64; m <= 1023; m++) {
+ if (fvco == m * fin_hz / p) {
+ rate_table->p = p;
+ rate_table->m = m;
+ rate_table->s = s;
+ fref = fin_hz / p;
+ fout = (ffrac << s) * 65535;
+ rate_table->k = fout / fref;
+ return 0;
+ }
+ }
+ }
+ }
+ }
+
+ return -EINVAL;
+}
+
static const struct rockchip_pll_rate_table *rockchip_get_pll_settings(
struct rockchip_clk_pll *pll, unsigned long rate)
{
@@ -68,6 +130,14 @@ static long rockchip_pll_round_rate(struct clk_hw *hw,
const struct rockchip_pll_rate_table *rate_table = pll->rate_table;
int i;
+ if (pll->type == pll_rk3588 || pll->type == pll_rk3588_core) {
+ long parent_rate = prate ? *prate : 24 * HZ_PER_MHZ;
+ struct rockchip_pll_rate_table pll_settings;
+
+ if (rockchip_rk3588_get_pll_settings(pll, parent_rate, drate, &pll_settings) >= 0)
+ return pll_settings.rate;
+ }
+
/* Assumming rate_table is in descending order */
for (i = 0; i < pll->rate_count; i++) {
if (drate >= rate_table[i].rate)
@@ -842,6 +912,212 @@ static const struct clk_ops rockchip_rk3399_pll_clk_ops = {
.init = rockchip_rk3399_pll_init,
};
+/**
+ * PLL used in RK3588
+ */
+
+#define RK3588_PLLCON(i) (i * 0x4)
+#define RK3588_PLLCON0_M_MASK 0x3ff
+#define RK3588_PLLCON0_M_SHIFT 0
+#define RK3588_PLLCON1_P_MASK 0x3f
+#define RK3588_PLLCON1_P_SHIFT 0
+#define RK3588_PLLCON1_S_MASK 0x7
+#define RK3588_PLLCON1_S_SHIFT 6
+#define RK3588_PLLCON2_K_MASK 0xffff
+#define RK3588_PLLCON2_K_SHIFT 0
+#define RK3588_PLLCON1_PWRDOWN BIT(13)
+#define RK3588_PLLCON6_LOCK_STATUS BIT(15)
+
+static int rockchip_rk3588_pll_wait_lock(struct rockchip_clk_pll *pll)
+{
+ u32 pllcon;
+ int ret;
+
+ /*
+ * Lock time typical 250, max 500 input clock cycles @24MHz
+ * So define a very safe maximum of 1000us, meaning 24000 cycles.
+ */
+ ret = readl_relaxed_poll_timeout(pll->reg_base + RK3588_PLLCON(6),
+ pllcon,
+ pllcon & RK3588_PLLCON6_LOCK_STATUS,
+ 0, 1000);
+ if (ret)
+ pr_err("%s: timeout waiting for pll to lock\n", __func__);
+
+ return ret;
+}
+
+static void rockchip_rk3588_pll_get_params(struct rockchip_clk_pll *pll,
+ struct rockchip_pll_rate_table *rate)
+{
+ u32 pllcon;
+
+ pllcon = readl_relaxed(pll->reg_base + RK3588_PLLCON(0));
+ rate->m = ((pllcon >> RK3588_PLLCON0_M_SHIFT) & RK3588_PLLCON0_M_MASK);
+
+ pllcon = readl_relaxed(pll->reg_base + RK3588_PLLCON(1));
+ rate->p = ((pllcon >> RK3588_PLLCON1_P_SHIFT) & RK3588_PLLCON1_P_MASK);
+ rate->s = ((pllcon >> RK3588_PLLCON1_S_SHIFT) & RK3588_PLLCON1_S_MASK);
+
+ pllcon = readl_relaxed(pll->reg_base + RK3588_PLLCON(2));
+ rate->k = ((pllcon >> RK3588_PLLCON2_K_SHIFT) & RK3588_PLLCON2_K_MASK);
+}
+
+static unsigned long rockchip_rk3588_pll_recalc_rate(struct clk_hw *hw, unsigned long prate)
+{
+ struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+ struct rockchip_pll_rate_table cur;
+ u64 rate64 = prate, postdiv;
+
+ rockchip_rk3588_pll_get_params(pll, &cur);
+
+ rate64 *= cur.m;
+ do_div(rate64, cur.p);
+
+ if (cur.k) {
+ /* fractional mode */
+ u64 frac_rate64 = prate * cur.k;
+
+ postdiv = cur.p * 65535;
+ do_div(frac_rate64, postdiv);
+ rate64 += frac_rate64;
+ }
+ rate64 = rate64 >> cur.s;
+
+ return (unsigned long)rate64;
+}
+
+static int rockchip_rk3588_pll_set_params(struct rockchip_clk_pll *pll,
+ const struct rockchip_pll_rate_table *rate)
+{
+ const struct clk_ops *pll_mux_ops = pll->pll_mux_ops;
+ struct clk_mux *pll_mux = &pll->pll_mux;
+ struct rockchip_pll_rate_table cur;
+ int rate_change_remuxed = 0;
+ int cur_parent;
+ int ret;
+
+ pr_debug("%s: rate settings for %lu p: %d, m: %d, s: %d, k: %d\n",
+ __func__, rate->rate, rate->p, rate->m, rate->s, rate->k);
+
+ rockchip_rk3588_pll_get_params(pll, &cur);
+ cur.rate = 0;
+
+ if (pll->type == pll_rk3588) {
+ cur_parent = pll_mux_ops->get_parent(&pll_mux->hw);
+ if (cur_parent == PLL_MODE_NORM) {
+ pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_SLOW);
+ rate_change_remuxed = 1;
+ }
+ }
+
+ /* set pll power down */
+ writel(HIWORD_UPDATE(RK3588_PLLCON1_PWRDOWN,
+ RK3588_PLLCON1_PWRDOWN, 0),
+ pll->reg_base + RK3399_PLLCON(1));
+
+ /* update pll values */
+ writel_relaxed(HIWORD_UPDATE(rate->m, RK3588_PLLCON0_M_MASK, RK3588_PLLCON0_M_SHIFT),
+ pll->reg_base + RK3399_PLLCON(0));
+
+ writel_relaxed(HIWORD_UPDATE(rate->p, RK3588_PLLCON1_P_MASK, RK3588_PLLCON1_P_SHIFT) |
+ HIWORD_UPDATE(rate->s, RK3588_PLLCON1_S_MASK, RK3588_PLLCON1_S_SHIFT),
+ pll->reg_base + RK3399_PLLCON(1));
+
+ writel_relaxed(HIWORD_UPDATE(rate->k, RK3588_PLLCON2_K_MASK, RK3588_PLLCON2_K_SHIFT),
+ pll->reg_base + RK3399_PLLCON(2));
+
+ /* set pll power up */
+ writel(HIWORD_UPDATE(0, RK3588_PLLCON1_PWRDOWN, 0),
+ pll->reg_base + RK3588_PLLCON(1));
+
+ /* wait for the pll to lock */
+ ret = rockchip_rk3588_pll_wait_lock(pll);
+ if (ret) {
+ pr_warn("%s: pll update unsuccessful, trying to restore old params\n",
+ __func__);
+ rockchip_rk3588_pll_set_params(pll, &cur);
+ }
+
+ if ((pll->type == pll_rk3588) && rate_change_remuxed)
+ pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_NORM);
+
+ return ret;
+}
+
+static int rockchip_rk3588_pll_set_rate(struct clk_hw *hw, unsigned long drate,
+ unsigned long prate)
+{
+ struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+ struct rockchip_pll_rate_table rate;
+ unsigned long old_rate = rockchip_rk3588_pll_recalc_rate(hw, prate);
+
+ pr_debug("%s: changing %s from %lu to %lu with a parent rate of %lu\n",
+ __func__, __clk_get_name(hw->clk), old_rate, drate, prate);
+
+ if (rockchip_rk3588_get_pll_settings(pll, prate, drate, &rate) < 0) {
+ pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
+ drate, __clk_get_name(hw->clk));
+ return -EINVAL;
+ }
+
+ return rockchip_rk3588_pll_set_params(pll, &rate);
+}
+
+static int rockchip_rk3588_pll_enable(struct clk_hw *hw)
+{
+ struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+
+ writel(HIWORD_UPDATE(0, RK3588_PLLCON1_PWRDOWN, 0),
+ pll->reg_base + RK3588_PLLCON(1));
+ rockchip_rk3588_pll_wait_lock(pll);
+
+ return 0;
+}
+
+static void rockchip_rk3588_pll_disable(struct clk_hw *hw)
+{
+ struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+
+ writel(HIWORD_UPDATE(RK3588_PLLCON1_PWRDOWN, RK3588_PLLCON1_PWRDOWN, 0),
+ pll->reg_base + RK3588_PLLCON(1));
+}
+
+static int rockchip_rk3588_pll_is_enabled(struct clk_hw *hw)
+{
+ struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+ u32 pllcon = readl(pll->reg_base + RK3588_PLLCON(1));
+
+ return !(pllcon & RK3588_PLLCON1_PWRDOWN);
+}
+
+static int rockchip_rk3588_pll_init(struct clk_hw *hw)
+{
+ struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
+
+ if (!(pll->flags & ROCKCHIP_PLL_SYNC_RATE))
+ return 0;
+
+ return 0;
+}
+
+static const struct clk_ops rockchip_rk3588_pll_clk_norate_ops = {
+ .recalc_rate = rockchip_rk3588_pll_recalc_rate,
+ .enable = rockchip_rk3588_pll_enable,
+ .disable = rockchip_rk3588_pll_disable,
+ .is_enabled = rockchip_rk3588_pll_is_enabled,
+};
+
+static const struct clk_ops rockchip_rk3588_pll_clk_ops = {
+ .recalc_rate = rockchip_rk3588_pll_recalc_rate,
+ .round_rate = rockchip_pll_round_rate,
+ .set_rate = rockchip_rk3588_pll_set_rate,
+ .enable = rockchip_rk3588_pll_enable,
+ .disable = rockchip_rk3588_pll_disable,
+ .is_enabled = rockchip_rk3588_pll_is_enabled,
+ .init = rockchip_rk3588_pll_init,
+};
+
/*
* Common registering of pll clocks
*/
@@ -890,7 +1166,8 @@ struct clk *rockchip_clk_register_pll(struct rockchip_clk_provider *ctx,
if (pll_type == pll_rk3036 ||
pll_type == pll_rk3066 ||
pll_type == pll_rk3328 ||
- pll_type == pll_rk3399)
+ pll_type == pll_rk3399 ||
+ pll_type == pll_rk3588)
pll_mux->flags |= CLK_MUX_HIWORD_MASK;
/* the actual muxing is xin24m, pll-output, xin32k */
@@ -957,6 +1234,14 @@ struct clk *rockchip_clk_register_pll(struct rockchip_clk_provider *ctx,
else
init.ops = &rockchip_rk3399_pll_clk_ops;
break;
+ case pll_rk3588:
+ case pll_rk3588_core:
+ if (!pll->rate_table)
+ init.ops = &rockchip_rk3588_pll_clk_norate_ops;
+ else
+ init.ops = &rockchip_rk3588_pll_clk_ops;
+ init.flags = flags;
+ break;
default:
pr_warn("%s: Unknown pll type for pll clk %s\n",
__func__, name);
diff --git a/drivers/clk/rockchip/clk.h b/drivers/clk/rockchip/clk.h
index 6aece7f07a7d..bf7c8d082fde 100644
--- a/drivers/clk/rockchip/clk.h
+++ b/drivers/clk/rockchip/clk.h
@@ -221,6 +221,8 @@ enum rockchip_pll_type {
pll_rk3066,
pll_rk3328,
pll_rk3399,
+ pll_rk3588,
+ pll_rk3588_core,
};
#define RK3036_PLL_RATE(_rate, _refdiv, _fbdiv, _postdiv1, \
@@ -253,6 +255,15 @@ enum rockchip_pll_type {
.nb = _nb, \
}
+#define RK3588_PLL_RATE(_rate, _p, _m, _s, _k) \
+{ \
+ .rate = _rate##U, \
+ .p = _p, \
+ .m = _m, \
+ .s = _s, \
+ .k = _k, \
+}
+
/**
* struct rockchip_clk_provider - information about clock provider
* @reg_base: virtual address for the register base.
@@ -288,6 +299,13 @@ struct rockchip_pll_rate_table {
unsigned int dsmpd;
unsigned int frac;
};
+ struct {
+ /* for RK3588 */
+ unsigned int m;
+ unsigned int p;
+ unsigned int s;
+ unsigned int k;
+ };
};
};
--
2.35.1
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