[PATCH 4/5] clk: meson: gxbb-ao: replace cec-32k with the dual divider
From: Jerome Brunet
Date: Tue Dec 04 2018 - 11:53:37 EST
Replace the cec-32k clock of gxbb-ao with the simpler dual divider
driver. The dual divider implements only the dividing part. All the
other bits are now exposed using simple elements, such as gates and
muxes
Signed-off-by: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
---
drivers/clk/meson/Makefile | 2 +-
drivers/clk/meson/gxbb-aoclk-32k.c | 193 -----------------------
drivers/clk/meson/gxbb-aoclk.c | 238 +++++++++++++++++++++++------
drivers/clk/meson/gxbb-aoclk.h | 20 +--
4 files changed, 191 insertions(+), 262 deletions(-)
delete mode 100644 drivers/clk/meson/gxbb-aoclk-32k.c
diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
index ae3fa2a127d5..6da1d7082f1a 100644
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile
@@ -7,7 +7,7 @@ obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-dualdiv.o
obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o sclk-div.o
obj-$(CONFIG_COMMON_CLK_MESON_AO) += meson-aoclk.o
obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o
-obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o gxbb-aoclk-32k.o
+obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o
obj-$(CONFIG_COMMON_CLK_AXG) += axg.o axg-aoclk.o
obj-$(CONFIG_COMMON_CLK_AXG_AUDIO) += axg-audio.o
obj-$(CONFIG_COMMON_CLK_REGMAP_MESON) += clk-regmap.o
diff --git a/drivers/clk/meson/gxbb-aoclk-32k.c b/drivers/clk/meson/gxbb-aoclk-32k.c
deleted file mode 100644
index 680467141a1d..000000000000
--- a/drivers/clk/meson/gxbb-aoclk-32k.c
+++ /dev/null
@@ -1,193 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (c) 2017 BayLibre, SAS.
- * Author: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
- */
-
-#include <linux/clk-provider.h>
-#include <linux/bitfield.h>
-#include <linux/regmap.h>
-#include "gxbb-aoclk.h"
-
-/*
- * The AO Domain embeds a dual/divider to generate a more precise
- * 32,768KHz clock for low-power suspend mode and CEC.
- * ______ ______
- * | | | |
- * ______ | Div1 |-| Cnt1 | ______
- * | | /|______| |______|\ | |
- * Xtal-->| Gate |---| ______ ______ X-X--| Gate |-->
- * |______| | \| | | |/ | |______|
- * | | Div2 |-| Cnt2 | |
- * | |______| |______| |
- * |_______________________|
- *
- * The dividing can be switched to single or dual, with a counter
- * for each divider to set when the switching is done.
- * The entire dividing mechanism can be also bypassed.
- */
-
-#define CLK_CNTL0_N1_MASK GENMASK(11, 0)
-#define CLK_CNTL0_N2_MASK GENMASK(23, 12)
-#define CLK_CNTL0_DUALDIV_EN BIT(28)
-#define CLK_CNTL0_OUT_GATE_EN BIT(30)
-#define CLK_CNTL0_IN_GATE_EN BIT(31)
-
-#define CLK_CNTL1_M1_MASK GENMASK(11, 0)
-#define CLK_CNTL1_M2_MASK GENMASK(23, 12)
-#define CLK_CNTL1_BYPASS_EN BIT(24)
-#define CLK_CNTL1_SELECT_OSC BIT(27)
-
-#define PWR_CNTL_ALT_32K_SEL GENMASK(13, 10)
-
-struct cec_32k_freq_table {
- unsigned long parent_rate;
- unsigned long target_rate;
- bool dualdiv;
- unsigned int n1;
- unsigned int n2;
- unsigned int m1;
- unsigned int m2;
-};
-
-static const struct cec_32k_freq_table aoclk_cec_32k_table[] = {
- [0] = {
- .parent_rate = 24000000,
- .target_rate = 32768,
- .dualdiv = true,
- .n1 = 733,
- .n2 = 732,
- .m1 = 8,
- .m2 = 11,
- },
-};
-
-/*
- * If CLK_CNTL0_DUALDIV_EN == 0
- * - will use N1 divider only
- * If CLK_CNTL0_DUALDIV_EN == 1
- * - hold M1 cycles of N1 divider then changes to N2
- * - hold M2 cycles of N2 divider then changes to N1
- * Then we can get more accurate division.
- */
-static unsigned long aoclk_cec_32k_recalc_rate(struct clk_hw *hw,
- unsigned long parent_rate)
-{
- struct aoclk_cec_32k *cec_32k = to_aoclk_cec_32k(hw);
- unsigned long n1;
- u32 reg0, reg1;
-
- regmap_read(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL0, ®0);
- regmap_read(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL1, ®1);
-
- if (reg1 & CLK_CNTL1_BYPASS_EN)
- return parent_rate;
-
- if (reg0 & CLK_CNTL0_DUALDIV_EN) {
- unsigned long n2, m1, m2, f1, f2, p1, p2;
-
- n1 = FIELD_GET(CLK_CNTL0_N1_MASK, reg0) + 1;
- n2 = FIELD_GET(CLK_CNTL0_N2_MASK, reg0) + 1;
-
- m1 = FIELD_GET(CLK_CNTL1_M1_MASK, reg1) + 1;
- m2 = FIELD_GET(CLK_CNTL1_M2_MASK, reg1) + 1;
-
- f1 = DIV_ROUND_CLOSEST(parent_rate, n1);
- f2 = DIV_ROUND_CLOSEST(parent_rate, n2);
-
- p1 = DIV_ROUND_CLOSEST(100000000 * m1, f1 * (m1 + m2));
- p2 = DIV_ROUND_CLOSEST(100000000 * m2, f2 * (m1 + m2));
-
- return DIV_ROUND_UP(100000000, p1 + p2);
- }
-
- n1 = FIELD_GET(CLK_CNTL0_N1_MASK, reg0) + 1;
-
- return DIV_ROUND_CLOSEST(parent_rate, n1);
-}
-
-static const struct cec_32k_freq_table *find_cec_32k_freq(unsigned long rate,
- unsigned long prate)
-{
- int i;
-
- for (i = 0 ; i < ARRAY_SIZE(aoclk_cec_32k_table) ; ++i)
- if (aoclk_cec_32k_table[i].parent_rate == prate &&
- aoclk_cec_32k_table[i].target_rate == rate)
- return &aoclk_cec_32k_table[i];
-
- return NULL;
-}
-
-static long aoclk_cec_32k_round_rate(struct clk_hw *hw, unsigned long rate,
- unsigned long *prate)
-{
- const struct cec_32k_freq_table *freq = find_cec_32k_freq(rate,
- *prate);
-
- /* If invalid return first one */
- if (!freq)
- return aoclk_cec_32k_table[0].target_rate;
-
- return freq->target_rate;
-}
-
-/*
- * From the Amlogic init procedure, the IN and OUT gates needs to be handled
- * in the init procedure to avoid any glitches.
- */
-
-static int aoclk_cec_32k_set_rate(struct clk_hw *hw, unsigned long rate,
- unsigned long parent_rate)
-{
- const struct cec_32k_freq_table *freq = find_cec_32k_freq(rate,
- parent_rate);
- struct aoclk_cec_32k *cec_32k = to_aoclk_cec_32k(hw);
- u32 reg = 0;
-
- if (!freq)
- return -EINVAL;
-
- /* Disable clock */
- regmap_update_bits(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL0,
- CLK_CNTL0_IN_GATE_EN | CLK_CNTL0_OUT_GATE_EN, 0);
-
- reg = FIELD_PREP(CLK_CNTL0_N1_MASK, freq->n1 - 1);
- if (freq->dualdiv)
- reg |= CLK_CNTL0_DUALDIV_EN |
- FIELD_PREP(CLK_CNTL0_N2_MASK, freq->n2 - 1);
-
- regmap_write(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL0, reg);
-
- reg = FIELD_PREP(CLK_CNTL1_M1_MASK, freq->m1 - 1);
- if (freq->dualdiv)
- reg |= FIELD_PREP(CLK_CNTL1_M2_MASK, freq->m2 - 1);
-
- regmap_write(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL1, reg);
-
- /* Enable clock */
- regmap_update_bits(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL0,
- CLK_CNTL0_IN_GATE_EN, CLK_CNTL0_IN_GATE_EN);
-
- udelay(200);
-
- regmap_update_bits(cec_32k->regmap, AO_RTC_ALT_CLK_CNTL0,
- CLK_CNTL0_OUT_GATE_EN, CLK_CNTL0_OUT_GATE_EN);
-
- regmap_update_bits(cec_32k->regmap, AO_CRT_CLK_CNTL1,
- CLK_CNTL1_SELECT_OSC, CLK_CNTL1_SELECT_OSC);
-
- /* Select 32k from XTAL */
- regmap_update_bits(cec_32k->regmap,
- AO_RTI_PWR_CNTL_REG0,
- PWR_CNTL_ALT_32K_SEL,
- FIELD_PREP(PWR_CNTL_ALT_32K_SEL, 4));
-
- return 0;
-}
-
-const struct clk_ops meson_aoclk_cec_32k_ops = {
- .recalc_rate = aoclk_cec_32k_recalc_rate,
- .round_rate = aoclk_cec_32k_round_rate,
- .set_rate = aoclk_cec_32k_set_rate,
-};
diff --git a/drivers/clk/meson/gxbb-aoclk.c b/drivers/clk/meson/gxbb-aoclk.c
index 42ed61d3c3fb..4188294d9a96 100644
--- a/drivers/clk/meson/gxbb-aoclk.c
+++ b/drivers/clk/meson/gxbb-aoclk.c
@@ -5,10 +5,19 @@
*/
#include <linux/platform_device.h>
#include <linux/mfd/syscon.h>
-#include "clk-regmap.h"
+#include "clkc.h"
#include "meson-aoclk.h"
#include "gxbb-aoclk.h"
+/* AO Configuration Clock registers offsets */
+#define AO_RTI_PWR_CNTL_REG1 0x0c
+#define AO_RTI_PWR_CNTL_REG0 0x10
+#define AO_RTI_GEN_CNTL_REG0 0x40
+#define AO_OSCIN_CNTL 0x58
+#define AO_CRT_CLK_CNTL1 0x68
+#define AO_RTC_ALT_CLK_CNTL0 0x94
+#define AO_RTC_ALT_CLK_CNTL1 0x98
+
#define GXBB_AO_GATE(_name, _bit) \
static struct clk_regmap _name##_ao = { \
.data = &(struct clk_regmap_gate_data) { \
@@ -31,13 +40,161 @@ GXBB_AO_GATE(uart1, 3);
GXBB_AO_GATE(uart2, 5);
GXBB_AO_GATE(ir_blaster, 6);
-static struct aoclk_cec_32k cec_32k_ao = {
- .hw.init = &(struct clk_init_data) {
- .name = "cec_32k_ao",
- .ops = &meson_aoclk_cec_32k_ops,
+static struct clk_regmap ao_cts_oscin = {
+ .data = &(struct clk_regmap_gate_data){
+ .offset = AO_RTI_PWR_CNTL_REG0,
+ .bit_idx = 6,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "ao_cts_oscin",
+ .ops = &clk_regmap_gate_ro_ops,
.parent_names = (const char *[]){ "xtal" },
.num_parents = 1,
- .flags = CLK_IGNORE_UNUSED,
+ },
+};
+
+static struct clk_regmap ao_32k_pre = {
+ .data = &(struct clk_regmap_gate_data){
+ .offset = AO_RTC_ALT_CLK_CNTL0,
+ .bit_idx = 31,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "ao_32k_pre",
+ .ops = &clk_regmap_gate_ops,
+ .parent_names = (const char *[]){ "ao_cts_oscin" },
+ .num_parents = 1,
+ },
+};
+
+static const struct meson_clk_dualdiv_param gxbb_32k_div_table[] = {
+ {
+ .dual = 1,
+ .n1 = 733,
+ .m1 = 8,
+ .n2 = 732,
+ .m2 = 11,
+ }, {}
+};
+
+static struct clk_regmap ao_32k_div = {
+ .data = &(struct meson_clk_dualdiv_data){
+ .n1 = {
+ .reg_off = AO_RTC_ALT_CLK_CNTL0,
+ .shift = 0,
+ .width = 12,
+ },
+ .n2 = {
+ .reg_off = AO_RTC_ALT_CLK_CNTL0,
+ .shift = 12,
+ .width = 12,
+ },
+ .m1 = {
+ .reg_off = AO_RTC_ALT_CLK_CNTL1,
+ .shift = 0,
+ .width = 12,
+ },
+ .m2 = {
+ .reg_off = AO_RTC_ALT_CLK_CNTL1,
+ .shift = 12,
+ .width = 12,
+ },
+ .dual = {
+ .reg_off = AO_RTC_ALT_CLK_CNTL0,
+ .shift = 28,
+ .width = 1,
+ },
+ .table = gxbb_32k_div_table,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "ao_32k_div",
+ .ops = &meson_clk_dualdiv_ops,
+ .parent_names = (const char *[]){ "ao_32k_pre" },
+ .num_parents = 1,
+ },
+};
+
+static struct clk_regmap ao_32k_sel = {
+ .data = &(struct clk_regmap_mux_data) {
+ .offset = AO_RTC_ALT_CLK_CNTL1,
+ .mask = 0x1,
+ .shift = 24,
+ .flags = CLK_MUX_ROUND_CLOSEST,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "ao_32k_sel",
+ .ops = &clk_regmap_mux_ops,
+ .parent_names = (const char *[]){ "ao_32k_div",
+ "ao_32k_pre" },
+ .num_parents = 2,
+ .flags = CLK_SET_RATE_PARENT,
+ },
+};
+
+static struct clk_regmap ao_32k = {
+ .data = &(struct clk_regmap_gate_data){
+ .offset = AO_RTC_ALT_CLK_CNTL0,
+ .bit_idx = 30,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "ao_32k",
+ .ops = &clk_regmap_gate_ops,
+ .parent_names = (const char *[]){ "ao_32k_sel" },
+ .num_parents = 1,
+ .flags = CLK_SET_RATE_PARENT,
+ },
+};
+
+static struct clk_regmap ao_cts_rtc_oscin = {
+ .data = &(struct clk_regmap_mux_data) {
+ .offset = AO_RTI_PWR_CNTL_REG0,
+ .mask = 0x7,
+ .shift = 10,
+ .table = (u32[]){ 1, 2, 3, 4 },
+ .flags = CLK_MUX_ROUND_CLOSEST,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "ao_cts_rtc_oscin",
+ .ops = &clk_regmap_mux_ops,
+ .parent_names = (const char *[]){ "ext_32k_0",
+ "ext_32k_1",
+ "ext_32k_2",
+ "ao_32k" },
+ .num_parents = 4,
+ .flags = CLK_SET_RATE_PARENT,
+ },
+};
+
+static struct clk_regmap ao_clk81 = {
+ .data = &(struct clk_regmap_mux_data) {
+ .offset = AO_RTI_PWR_CNTL_REG0,
+ .mask = 0x1,
+ .shift = 0,
+ .flags = CLK_MUX_ROUND_CLOSEST,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "ao_clk81",
+ .ops = &clk_regmap_mux_ro_ops,
+ .parent_names = (const char *[]){ "clk81",
+ "ao_cts_rtc_oscin" },
+ .num_parents = 2,
+ .flags = CLK_SET_RATE_PARENT,
+ },
+};
+
+static struct clk_regmap ao_cts_cec = {
+ .data = &(struct clk_regmap_mux_data) {
+ .offset = AO_CRT_CLK_CNTL1,
+ .mask = 0x1,
+ .shift = 27,
+ .table = (u32[]){ 1 },
+ .flags = CLK_MUX_ROUND_CLOSEST,
+ },
+ .hw.init = &(struct clk_init_data){
+ .name = "ao_cts_cec",
+ .ops = &clk_regmap_mux_ops,
+ .parent_names = (const char *[]){ "ao_cts_rtc_oscin" },
+ .num_parents = 1,
+ .flags = CLK_SET_RATE_PARENT,
},
};
@@ -50,13 +207,21 @@ static const unsigned int gxbb_aoclk_reset[] = {
[RESET_AO_IR_BLASTER] = 23,
};
-static struct clk_regmap *gxbb_aoclk_gate[] = {
- [CLKID_AO_REMOTE] = &remote_ao,
- [CLKID_AO_I2C_MASTER] = &i2c_master_ao,
- [CLKID_AO_I2C_SLAVE] = &i2c_slave_ao,
- [CLKID_AO_UART1] = &uart1_ao,
- [CLKID_AO_UART2] = &uart2_ao,
- [CLKID_AO_IR_BLASTER] = &ir_blaster_ao,
+static struct clk_regmap *gxbb_aoclk[] = {
+ &remote_ao,
+ &i2c_master_ao,
+ &i2c_slave_ao,
+ &uart1_ao,
+ &uart2_ao,
+ &ir_blaster_ao,
+ &ao_cts_oscin,
+ &ao_32k_pre,
+ &ao_32k_div,
+ &ao_32k_sel,
+ &ao_32k,
+ &ao_cts_rtc_oscin,
+ &ao_clk81,
+ &ao_cts_cec,
};
static const struct clk_hw_onecell_data gxbb_aoclk_onecell_data = {
@@ -67,52 +232,27 @@ static const struct clk_hw_onecell_data gxbb_aoclk_onecell_data = {
[CLKID_AO_UART1] = &uart1_ao.hw,
[CLKID_AO_UART2] = &uart2_ao.hw,
[CLKID_AO_IR_BLASTER] = &ir_blaster_ao.hw,
- [CLKID_AO_CEC_32K] = &cec_32k_ao.hw,
+ [CLKID_AO_CEC_32K] = &ao_cts_cec.hw,
+ [CLKID_AO_CTS_OSCIN] = &ao_cts_oscin.hw,
+ [CLKID_AO_32K_PRE] = &ao_32k_pre.hw,
+ [CLKID_AO_32K_DIV] = &ao_32k_div.hw,
+ [CLKID_AO_32K_SEL] = &ao_32k_sel.hw,
+ [CLKID_AO_32K] = &ao_32k.hw,
+ [CLKID_AO_CTS_RTC_OSCIN] = &ao_cts_rtc_oscin.hw,
+ [CLKID_AO_CLK81] = &ao_clk81.hw,
},
.num = NR_CLKS,
};
-static int gxbb_register_cec_ao_32k(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct regmap *regmap;
- int ret;
-
- regmap = syscon_node_to_regmap(of_get_parent(dev->of_node));
- if (IS_ERR(regmap)) {
- dev_err(dev, "failed to get regmap\n");
- return PTR_ERR(regmap);
- }
-
- /* Specific clocks */
- cec_32k_ao.regmap = regmap;
- ret = devm_clk_hw_register(dev, &cec_32k_ao.hw);
- if (ret) {
- dev_err(&pdev->dev, "clk cec_32k_ao register failed.\n");
- return ret;
- }
-
- return 0;
-}
-
static const struct meson_aoclk_data gxbb_aoclkc_data = {
.reset_reg = AO_RTI_GEN_CNTL_REG0,
.num_reset = ARRAY_SIZE(gxbb_aoclk_reset),
.reset = gxbb_aoclk_reset,
- .num_clks = ARRAY_SIZE(gxbb_aoclk_gate),
- .clks = gxbb_aoclk_gate,
+ .num_clks = ARRAY_SIZE(gxbb_aoclk),
+ .clks = gxbb_aoclk,
.hw_data = &gxbb_aoclk_onecell_data,
};
-static int gxbb_aoclkc_probe(struct platform_device *pdev)
-{
- int ret = gxbb_register_cec_ao_32k(pdev);
- if (ret)
- return ret;
-
- return meson_aoclkc_probe(pdev);
-}
-
static const struct of_device_id gxbb_aoclkc_match_table[] = {
{
.compatible = "amlogic,meson-gx-aoclkc",
@@ -122,7 +262,7 @@ static const struct of_device_id gxbb_aoclkc_match_table[] = {
};
static struct platform_driver gxbb_aoclkc_driver = {
- .probe = gxbb_aoclkc_probe,
+ .probe = meson_aoclkc_probe,
.driver = {
.name = "gxbb-aoclkc",
.of_match_table = gxbb_aoclkc_match_table,
diff --git a/drivers/clk/meson/gxbb-aoclk.h b/drivers/clk/meson/gxbb-aoclk.h
index c514493d989a..1db16f9b37d4 100644
--- a/drivers/clk/meson/gxbb-aoclk.h
+++ b/drivers/clk/meson/gxbb-aoclk.h
@@ -7,25 +7,7 @@
#ifndef __GXBB_AOCLKC_H
#define __GXBB_AOCLKC_H
-#define NR_CLKS 7
-
-/* AO Configuration Clock registers offsets */
-#define AO_RTI_PWR_CNTL_REG1 0x0c
-#define AO_RTI_PWR_CNTL_REG0 0x10
-#define AO_RTI_GEN_CNTL_REG0 0x40
-#define AO_OSCIN_CNTL 0x58
-#define AO_CRT_CLK_CNTL1 0x68
-#define AO_RTC_ALT_CLK_CNTL0 0x94
-#define AO_RTC_ALT_CLK_CNTL1 0x98
-
-struct aoclk_cec_32k {
- struct clk_hw hw;
- struct regmap *regmap;
-};
-
-#define to_aoclk_cec_32k(_hw) container_of(_hw, struct aoclk_cec_32k, hw)
-
-extern const struct clk_ops meson_aoclk_cec_32k_ops;
+#define NR_CLKS 14
#include <dt-bindings/clock/gxbb-aoclkc.h>
#include <dt-bindings/reset/gxbb-aoclkc.h>
--
2.19.1