[PATCH v3 3/7] clk: meson: a1: pll: support 'syspll' general-purpose PLL for CPU clock

Dmitry Rokosov
2024-05-15T18:51:22Z

The 'syspll' PLL, also known as the system PLL, is a general and
essential PLL responsible for generating the CPU clock frequency.
With its wide-ranging capabilities, it is designed to accommodate
frequencies within the range of 768MHz to 1536MHz.

Signed-off-by: Dmitry Rokosov <ddrokosov@salutedevices.com>
---
drivers/clk/meson/a1-pll.c | 72 ++++++++++++++++++++++++++++++++++++++
drivers/clk/meson/a1-pll.h | 6 ++++
2 files changed, 78 insertions(+)

diff --git a/drivers/clk/meson/a1-pll.c b/drivers/clk/meson/a1-pll.c
index 60b2e53e7e51..286e83199d17 100644
--- a/drivers/clk/meson/a1-pll.c
+++ b/drivers/clk/meson/a1-pll.c
@@ -138,6 +138,76 @@ static struct clk_regmap hifi_pll = {
},
};

+static const struct pll_mult_range sys_pll_mult_range = {
+ .min = 32,
+ .max = 64,
+};
+
+static const struct reg_sequence sys_pll_init_regs[] = {
+ { .reg = ANACTRL_SYSPLL_CTRL1, .def = 0x01800000 },
+ { .reg = ANACTRL_SYSPLL_CTRL2, .def = 0x00001100 },
+ { .reg = ANACTRL_SYSPLL_CTRL3, .def = 0x10022300 },
+ { .reg = ANACTRL_SYSPLL_CTRL4, .def = 0x00300000 },
+ { .reg = ANACTRL_SYSPLL_CTRL0, .def = 0x01f18432 },
+};
+
+static struct clk_regmap sys_pll = {
+ .data = &(struct meson_clk_pll_data){
+ .en = {
+ .reg_off = ANACTRL_SYSPLL_CTRL0,
+ .shift = 28,
+ .width = 1,
+ },
+ .m = {
+ .reg_off = ANACTRL_SYSPLL_CTRL0,
+ .shift = 0,
+ .width = 8,
+ },
+ .n = {
+ .reg_off = ANACTRL_SYSPLL_CTRL0,
+ .shift = 10,
+ .width = 5,
+ },
+ .frac = {
+ .reg_off = ANACTRL_SYSPLL_CTRL1,
+ .shift = 0,
+ .width = 19,
+ },
+ .l = {
+ .reg_off = ANACTRL_SYSPLL_STS,
+ .shift = 31,
+ .width = 1,
+ },
+ .current_en = {
+ .reg_off = ANACTRL_SYSPLL_CTRL0,
+ .shift = 26,
+ .width = 1,
+ },
+ .l_detect = {
+ .reg_off = ANACTRL_SYSPLL_CTRL2,
+ .shift = 6,
+ .width = 1,
+ },
+ .range = &sys_pll_mult_range,
+ .init_regs = sys_pll_init_regs,
+ .init_count = ARRAY_SIZE(sys_pll_init_regs),
+ /*
+ * The sys_pll clock is usually enabled and initialized in the
+ * bootloader stage. Additionally, the cpu_clk is connected to
+ * sys_pll. As a result, it is not allowed to initialize the
+ * cpu_clk again, as doing so would prevent the CPU from
+ * executing any instructions.
+ */
+ .flags = CLK_MESON_PLL_NOINIT_ENABLED,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "sys_pll",
+ .ops = &meson_clk_pll_ops,
+ .parent_names = (const char *[]){ "syspll_in" },
+ .num_parents = 1,
+ },
+};
+
static struct clk_fixed_factor fclk_div2_div = {
.mult = 1,
.div = 2,
@@ -283,6 +353,7 @@ static struct clk_hw *a1_pll_hw_clks[] = {
[CLKID_FCLK_DIV5] = &fclk_div5.hw,
[CLKID_FCLK_DIV7] = &fclk_div7.hw,
[CLKID_HIFI_PLL] = &hifi_pll.hw,
+ [CLKID_SYS_PLL] = &sys_pll.hw,
};

static struct clk_regmap *const a1_pll_regmaps[] = {
@@ -293,6 +364,7 @@ static struct clk_regmap *const a1_pll_regmaps[] = {
&fclk_div5,
&fclk_div7,
&hifi_pll,
+ &sys_pll,
};

static struct regmap_config a1_pll_regmap_cfg = {
diff --git a/drivers/clk/meson/a1-pll.h b/drivers/clk/meson/a1-pll.h
index 4be17b2bf383..666d9b2137e9 100644
--- a/drivers/clk/meson/a1-pll.h
+++ b/drivers/clk/meson/a1-pll.h
@@ -18,6 +18,12 @@
#define ANACTRL_FIXPLL_CTRL0 0x0
#define ANACTRL_FIXPLL_CTRL1 0x4
#define ANACTRL_FIXPLL_STS 0x14
+#define ANACTRL_SYSPLL_CTRL0 0x80
+#define ANACTRL_SYSPLL_CTRL1 0x84
+#define ANACTRL_SYSPLL_CTRL2 0x88
+#define ANACTRL_SYSPLL_CTRL3 0x8c
+#define ANACTRL_SYSPLL_CTRL4 0x90
+#define ANACTRL_SYSPLL_STS 0x94
#define ANACTRL_HIFIPLL_CTRL0 0xc0
#define ANACTRL_HIFIPLL_CTRL1 0xc4
#define ANACTRL_HIFIPLL_CTRL2 0xc8
--
2.43.0