clk: meson-g12a: add PCIE PLL clocks

Add the PCIe reference clock feeding the USB3 + PCIE combo PHY.

This PLL needs a very precise register sequence to permit to be locked,
thus using the specific clk-pll pcie ops.

The PLL is then followed by :
- a fixed /2 divider
- a 5-bit 1-based divider
- a final /2 divider

This reference clock is fixed to 100MHz, thus only a single PLL setup
is added.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lkml.kernel.org/r/20190307141455.23879-4-narmstrong@baylibre.com

2 files changed, 122 insertions, 1 deletions

diff --git a/drivers/clk/meson/g12a.c b/drivers/clk/meson/g12a.c
index 10ba8bc4646d..a47435f91f2f 100644
--- a/drivers/clk/meson/g12a.c
+++ b/drivers/clk/meson/g12a.c
@@ -614,6 +614,118 @@ static struct clk_regmap g12a_hifi_pll = {
         },
 };
 
+/*
+ * The Meson G12A PCIE PLL is fined tuned to deliver a very precise
+ * 100MHz reference clock for the PCIe Analog PHY, and thus requires
+ * a strict register sequence to enable the PLL.
+ */
+static const struct reg_sequence g12a_pcie_pll_init_regs[] = {
+        { .reg = HHI_PCIE_PLL_CNTL0,    .def = 0x20090496 },
+        { .reg = HHI_PCIE_PLL_CNTL0,    .def = 0x30090496 },
+        { .reg = HHI_PCIE_PLL_CNTL1,    .def = 0x00000000 },
+        { .reg = HHI_PCIE_PLL_CNTL2,    .def = 0x00001100 },
+        { .reg = HHI_PCIE_PLL_CNTL3,    .def = 0x10058e00 },
+        { .reg = HHI_PCIE_PLL_CNTL4,    .def = 0x000100c0 },
+        { .reg = HHI_PCIE_PLL_CNTL5,    .def = 0x68000048 },
+        { .reg = HHI_PCIE_PLL_CNTL5,    .def = 0x68000068, .delay_us = 20 },
+        { .reg = HHI_PCIE_PLL_CNTL4,    .def = 0x008100c0, .delay_us = 10 },
+        { .reg = HHI_PCIE_PLL_CNTL0,    .def = 0x34090496 },
+        { .reg = HHI_PCIE_PLL_CNTL0,    .def = 0x14090496, .delay_us = 10 },
+        { .reg = HHI_PCIE_PLL_CNTL2,    .def = 0x00001000 },
+};
+
+/* Keep a single entry table for recalc/round_rate() ops */
+static const struct pll_params_table g12a_pcie_pll_table[] = {
+        PLL_PARAMS(150, 1),
+        {0, 0},
+};
+
+static struct clk_regmap g12a_pcie_pll_dco = {
+        .data = &(struct meson_clk_pll_data){
+                .en = {
+                        .reg_off = HHI_PCIE_PLL_CNTL0,
+                        .shift   = 28,
+                        .width   = 1,
+                },
+                .m = {
+                        .reg_off = HHI_PCIE_PLL_CNTL0,
+                        .shift   = 0,
+                        .width   = 8,
+                },
+                .n = {
+                        .reg_off = HHI_PCIE_PLL_CNTL0,
+                        .shift   = 10,
+                        .width   = 5,
+                },
+                .frac = {
+                        .reg_off = HHI_PCIE_PLL_CNTL1,
+                        .shift   = 0,
+                        .width   = 12,
+                },
+                .l = {
+                        .reg_off = HHI_PCIE_PLL_CNTL0,
+                        .shift   = 31,
+                        .width   = 1,
+                },
+                .rst = {
+                        .reg_off = HHI_PCIE_PLL_CNTL0,
+                        .shift   = 29,
+                        .width   = 1,
+                },
+                .table = g12a_pcie_pll_table,
+                .init_regs = g12a_pcie_pll_init_regs,
+                .init_count = ARRAY_SIZE(g12a_pcie_pll_init_regs),
+        },
+        .hw.init = &(struct clk_init_data){
+                .name = "pcie_pll_dco",
+                .ops = &meson_clk_pcie_pll_ops,
+                .parent_names = (const char *[]){ IN_PREFIX "xtal" },
+                .num_parents = 1,
+        },
+};
+
+static struct clk_fixed_factor g12a_pcie_pll_dco_div2 = {
+        .mult = 1,
+        .div = 2,
+        .hw.init = &(struct clk_init_data){
+                .name = "pcie_pll_dco_div2",
+                .ops = &clk_fixed_factor_ops,
+                .parent_names = (const char *[]){ "pcie_pll_dco" },
+                .num_parents = 1,
+                .flags = CLK_SET_RATE_PARENT,
+        },
+};
+
+static struct clk_regmap g12a_pcie_pll_od = {
+        .data = &(struct clk_regmap_div_data){
+                .offset = HHI_PCIE_PLL_CNTL0,
+                .shift = 16,
+                .width = 5,
+                .flags = CLK_DIVIDER_ROUND_CLOSEST |
+                         CLK_DIVIDER_ONE_BASED |
+                         CLK_DIVIDER_ALLOW_ZERO,
+        },
+        .hw.init = &(struct clk_init_data){
+                .name = "pcie_pll_od",
+                .ops = &clk_regmap_divider_ops,
+                .parent_names = (const char *[]){ "pcie_pll_dco_div2" },
+                .num_parents = 1,
+                .flags = CLK_SET_RATE_PARENT,
+        },
+};
+
+static struct clk_fixed_factor g12a_pcie_pll = {
+        .mult = 1,
+        .div = 2,
+        .hw.init = &(struct clk_init_data){
+                .name = "pcie_pll_pll",
+                .ops = &clk_fixed_factor_ops,
+                .parent_names = (const char *[]){ "pcie_pll_od" },
+                .num_parents = 1,
+                .flags = CLK_SET_RATE_PARENT,
+        },
+};
+
 static struct clk_regmap g12a_hdmi_pll_dco = {
         .data = &(struct meson_clk_pll_data){
                 .en = {
@@ -2499,6 +2611,10 @@ static struct clk_hw_onecell_data g12a_hw_onecell_data = {
                 [CLKID_CPU_CLK_AXI]             = &g12a_cpu_clk_axi.hw,
                 [CLKID_CPU_CLK_TRACE_DIV]       = &g12a_cpu_clk_trace_div.hw,
                 [CLKID_CPU_CLK_TRACE]           = &g12a_cpu_clk_trace.hw,
+                [CLKID_PCIE_PLL_DCO]            = &g12a_pcie_pll_dco.hw,
+                [CLKID_PCIE_PLL_DCO_DIV2]       = &g12a_pcie_pll_dco_div2.hw,
+                [CLKID_PCIE_PLL_OD]             = &g12a_pcie_pll_od.hw,
+                [CLKID_PCIE_PLL]                = &g12a_pcie_pll.hw,
                 [NR_CLKS]                       = NULL,
         },
         .num = NR_CLKS,
@@ -2685,6 +2801,8 @@ static struct clk_regmap *const g12a_clk_regmaps[] = {
         &g12a_cpu_clk_axi,
         &g12a_cpu_clk_trace_div,
         &g12a_cpu_clk_trace,
+        &g12a_pcie_pll_od,
+        &g12a_pcie_pll_dco,
 };
 
 static const struct meson_eeclkc_data g12a_clkc_data = {
diff --git a/drivers/clk/meson/g12a.h b/drivers/clk/meson/g12a.h
index 70aa469ca1cf..1393a09730a6 100644
--- a/drivers/clk/meson/g12a.h
+++ b/drivers/clk/meson/g12a.h
@@ -186,8 +186,11 @@
 #define CLKID_CPU_CLK_AXI                       195
 #define CLKID_CPU_CLK_TRACE_DIV                 196
 #define CLKID_CPU_CLK_TRACE                     197
+#define CLKID_PCIE_PLL_DCO                      198
+#define CLKID_PCIE_PLL_DCO_DIV2                 199
+#define CLKID_PCIE_PLL_OD                       200
 
-#define NR_CLKS                                 198
+#define NR_CLKS                                 202
 
 /* include the CLKIDs that have been made part of the DT binding */
 #include <dt-bindings/clock/g12a-clkc.h>