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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
hifive-unleashed-5.2
Neil Armstrong 2019-03-07 15:14:55 +01:00
parent 39b8500283
commit 34775209ba
2 changed files with 122 additions and 1 deletions
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118
drivers/clk/meson/g12a.c
View File

@ -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 = {

5
drivers/clk/meson/g12a.h
View File

@ -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>