clk: baikal-t1: Move reset-controls code into a dedicated module

Before adding the directly controlled resets support it's reasonable to
move the existing resets control functionality into a dedicated object for
the sake of the CCU dividers clock driver simplification. After the new
functionality was added clk-ccu-div.c would have got to a mixture of the
weakly dependent clocks and resets methods. Splitting the methods up into
the two objects will make the code easier to read and maintain. It shall
also improve the code scalability (though hopefully we won't need this
part that much in the future).

The reset control functionality is now implemented in the framework of a
single unit since splitting it up doesn't make much sense due to
relatively simple reset operations. The ccu-rst.c has been designed to be
looking like ccu-div.c or ccu-pll.c with two globally available methods
for the sake of the code unification and better code readability.

This commit doesn't provide any change in the CCU reset implementation
semantics. As before the driver will support the trigger-like CCU resets
only, which are responsible for the AXI-bus, APB-bus and SATA-ref blocks
reset. The assert/de-assert-capable reset controls support will be added
in the next commit.

Note the CCU Clock dividers and resets functionality split up was possible
due to not having any side-effects (at least we didn't found ones) of the
regmap-based concurrent access of the common CCU dividers/reset CSRs.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20220929225402.9696-6-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

1 files changed, 10 insertions, 82 deletions

diff --git a/drivers/clk/baikal-t1/clk-ccu-div.c b/drivers/clk/baikal-t1/clk-ccu-div.c
index 90f4fda406ee..278aa38d767e 100644
--- a/drivers/clk/baikal-t1/clk-ccu-div.c
+++ b/drivers/clk/baikal-t1/clk-ccu-div.c
@@ -24,9 +24,9 @@
 #include <linux/regmap.h>
 
 #include <dt-bindings/clock/bt1-ccu.h>
-#include <dt-bindings/reset/bt1-ccu.h>
 
 #include "ccu-div.h"
+#include "ccu-rst.h"
 
 #define CCU_AXI_MAIN_BASE		0x030
 #define CCU_AXI_DDR_BASE		0x034
@@ -95,12 +95,6 @@
 		.divider = _divider				\
 	}
 
-#define CCU_DIV_RST_MAP(_rst_id, _clk_id)	\
-	{					\
-		.rst_id = _rst_id,		\
-		.clk_id = _clk_id		\
-	}
-
 struct ccu_div_info {
 	unsigned int id;
 	const char *name;
@@ -115,11 +109,6 @@ struct ccu_div_info {
 	unsigned long features;
 };
 
-struct ccu_div_rst_map {
-	unsigned int rst_id;
-	unsigned int clk_id;
-};
-
 struct ccu_div_data {
 	struct device_node *np;
 	struct regmap *sys_regs;
@@ -128,11 +117,8 @@ struct ccu_div_data {
 	const struct ccu_div_info *divs_info;
 	struct ccu_div **divs;
 
-	unsigned int rst_num;
-	const struct ccu_div_rst_map *rst_map;
-	struct reset_controller_dev rcdev;
+	struct ccu_rst *rsts;
 };
-#define to_ccu_div_data(_rcdev) container_of(_rcdev, struct ccu_div_data, rcdev)
 
 /*
  * AXI Main Interconnect (axi_main_clk) and DDR AXI-bus (axi_ddr_clk) clocks
@@ -179,20 +165,6 @@ static const struct ccu_div_info axi_info[] = {
 			 CLK_SET_RATE_GATE, CCU_DIV_RESET_DOMAIN)
 };
 
-static const struct ccu_div_rst_map axi_rst_map[] = {
-	CCU_DIV_RST_MAP(CCU_AXI_MAIN_RST, CCU_AXI_MAIN_CLK),
-	CCU_DIV_RST_MAP(CCU_AXI_DDR_RST, CCU_AXI_DDR_CLK),
-	CCU_DIV_RST_MAP(CCU_AXI_SATA_RST, CCU_AXI_SATA_CLK),
-	CCU_DIV_RST_MAP(CCU_AXI_GMAC0_RST, CCU_AXI_GMAC0_CLK),
-	CCU_DIV_RST_MAP(CCU_AXI_GMAC1_RST, CCU_AXI_GMAC1_CLK),
-	CCU_DIV_RST_MAP(CCU_AXI_XGMAC_RST, CCU_AXI_XGMAC_CLK),
-	CCU_DIV_RST_MAP(CCU_AXI_PCIE_M_RST, CCU_AXI_PCIE_M_CLK),
-	CCU_DIV_RST_MAP(CCU_AXI_PCIE_S_RST, CCU_AXI_PCIE_S_CLK),
-	CCU_DIV_RST_MAP(CCU_AXI_USB_RST, CCU_AXI_USB_CLK),
-	CCU_DIV_RST_MAP(CCU_AXI_HWA_RST, CCU_AXI_HWA_CLK),
-	CCU_DIV_RST_MAP(CCU_AXI_SRAM_RST, CCU_AXI_SRAM_CLK)
-};
-
 /*
  * APB-bus clock is marked as critical since it's a main communication bus
  * for the SoC devices registers IO-operations.
@@ -254,11 +226,6 @@ static const struct ccu_div_info sys_info[] = {
 			 CLK_SET_RATE_GATE, CCU_DIV_SKIP_ONE_TO_THREE)
 };
 
-static const struct ccu_div_rst_map sys_rst_map[] = {
-	CCU_DIV_RST_MAP(CCU_SYS_SATA_REF_RST, CCU_SYS_SATA_REF_CLK),
-	CCU_DIV_RST_MAP(CCU_SYS_APB_RST, CCU_SYS_APB_CLK),
-};
-
 static struct ccu_div *ccu_div_find_desc(struct ccu_div_data *data,
 					 unsigned int clk_id)
 {
@@ -274,42 +241,6 @@ static struct ccu_div *ccu_div_find_desc(struct ccu_div_data *data,
 	return ERR_PTR(-EINVAL);
 }
 
-static int ccu_div_reset(struct reset_controller_dev *rcdev,
-			 unsigned long rst_id)
-{
-	struct ccu_div_data *data = to_ccu_div_data(rcdev);
-	const struct ccu_div_rst_map *map;
-	struct ccu_div *div;
-	int idx, ret;
-
-	for (idx = 0, map = data->rst_map; idx < data->rst_num; ++idx, ++map) {
-		if (map->rst_id == rst_id)
-			break;
-	}
-	if (idx == data->rst_num) {
-		pr_err("Invalid reset ID %lu specified\n", rst_id);
-		return -EINVAL;
-	}
-
-	div = ccu_div_find_desc(data, map->clk_id);
-	if (IS_ERR(div)) {
-		pr_err("Invalid clock ID %d in mapping\n", map->clk_id);
-		return PTR_ERR(div);
-	}
-
-	ret = ccu_div_reset_domain(div);
-	if (ret) {
-		pr_err("Reset isn't supported by divider %s\n",
-			clk_hw_get_name(ccu_div_get_clk_hw(div)));
-	}
-
-	return ret;
-}
-
-static const struct reset_control_ops ccu_div_rst_ops = {
-	.reset = ccu_div_reset,
-};
-
 static struct ccu_div_data *ccu_div_create_data(struct device_node *np)
 {
 	struct ccu_div_data *data;
@@ -323,13 +254,9 @@ static struct ccu_div_data *ccu_div_create_data(struct device_node *np)
 	if (of_device_is_compatible(np, "baikal,bt1-ccu-axi")) {
 		data->divs_num = ARRAY_SIZE(axi_info);
 		data->divs_info = axi_info;
-		data->rst_num = ARRAY_SIZE(axi_rst_map);
-		data->rst_map = axi_rst_map;
 	} else if (of_device_is_compatible(np, "baikal,bt1-ccu-sys")) {
 		data->divs_num = ARRAY_SIZE(sys_info);
 		data->divs_info = sys_info;
-		data->rst_num = ARRAY_SIZE(sys_rst_map);
-		data->rst_map = sys_rst_map;
 	} else {
 		pr_err("Incompatible DT node '%s' specified\n",
 			of_node_full_name(np));
@@ -455,18 +382,19 @@ static void ccu_div_clk_unregister(struct ccu_div_data *data)
 
 static int ccu_div_rst_register(struct ccu_div_data *data)
 {
-	int ret;
+	struct ccu_rst_init_data init = {0};
 
-	data->rcdev.ops = &ccu_div_rst_ops;
-	data->rcdev.of_node = data->np;
-	data->rcdev.nr_resets = data->rst_num;
+	init.sys_regs = data->sys_regs;
+	init.np = data->np;
 
-	ret = reset_controller_register(&data->rcdev);
-	if (ret)
+	data->rsts = ccu_rst_hw_register(&init);
+	if (IS_ERR(data->rsts)) {
 		pr_err("Couldn't register divider '%s' reset controller\n",
 			of_node_full_name(data->np));
+		return PTR_ERR(data->rsts);
+	}
 
-	return ret;
+	return 0;
 }
 
 static void ccu_div_init(struct device_node *np)