[PATCH v2 1/1] memory: bt1-l2-ctl: Remove not-going-to-be-supported code for Baikal SoC

[Andy Shevchenko]

As noticed in the discussion [1] the Baikal SoC and platforms
are not going to be finalized, hence remove stale code.

Link: https://lore.kernel.org/lkml/22b92ddf-6321-41b5-8073-f9c7064d3432@xxxxxxxxxxxxx/ [1]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---

v2: dropped DT bindings change (Krzysztof)

 drivers/memory/Kconfig      |  11 --
 drivers/memory/Makefile     |   1 -
 drivers/memory/bt1-l2-ctl.c | 323 ------------------------------------
 3 files changed, 335 deletions(-)
 delete mode 100644 drivers/memory/bt1-l2-ctl.c

diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig
index 79df0d22e218..e5527020ff33 100644
--- a/drivers/memory/Kconfig
+++ b/drivers/memory/Kconfig
@@ -64,17 +64,6 @@ config BRCMSTB_MEMC
 	  controller and specifically control the Self Refresh Power Down
 	  (SRPD) inactivity timeout.
 
-config BT1_L2_CTL
-	bool "Baikal-T1 CM2 L2-RAM Cache Control Block"
-	depends on MIPS_BAIKAL_T1 || COMPILE_TEST
-	select MFD_SYSCON
-	help
-	  Baikal-T1 CPU is based on the MIPS P5600 Warrior IP-core. The CPU
-	  resides Coherency Manager v2 with embedded 1MB L2-cache. It's
-	  possible to tune the L2 cache performance up by setting the data,
-	  tags and way-select latencies of RAM access. This driver provides a
-	  dt properties-based and sysfs interface for it.
-
 config TI_AEMIF
 	tristate "Texas Instruments AEMIF driver"
 	depends on ARCH_DAVINCI || ARCH_KEYSTONE || COMPILE_TEST
diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
index c1959661bf63..3ee883c8759a 100644
--- a/drivers/memory/Makefile
+++ b/drivers/memory/Makefile
@@ -11,7 +11,6 @@ obj-$(CONFIG_ARM_PL172_MPMC)	+= pl172.o
 obj-$(CONFIG_ATMEL_EBI)		+= atmel-ebi.o
 obj-$(CONFIG_BRCMSTB_DPFE)	+= brcmstb_dpfe.o
 obj-$(CONFIG_BRCMSTB_MEMC)	+= brcmstb_memc.o
-obj-$(CONFIG_BT1_L2_CTL)	+= bt1-l2-ctl.o
 obj-$(CONFIG_TI_AEMIF)		+= ti-aemif.o
 obj-$(CONFIG_TI_EMIF)		+= emif.o
 obj-$(CONFIG_OMAP_GPMC)		+= omap-gpmc.o
diff --git a/drivers/memory/bt1-l2-ctl.c b/drivers/memory/bt1-l2-ctl.c
deleted file mode 100644
index 0fd96abc172a..000000000000
--- a/drivers/memory/bt1-l2-ctl.c
+++ /dev/null
@@ -1,323 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
- *
- * Authors:
- *   Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>
- *
- * Baikal-T1 CM2 L2-cache Control Block driver.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/bitfield.h>
-#include <linux/types.h>
-#include <linux/device.h>
-#include <linux/platform_device.h>
-#include <linux/regmap.h>
-#include <linux/mfd/syscon.h>
-#include <linux/sysfs.h>
-#include <linux/of.h>
-
-#define L2_CTL_REG			0x028
-#define L2_CTL_DATA_STALL_FLD		0
-#define L2_CTL_DATA_STALL_MASK		GENMASK(1, L2_CTL_DATA_STALL_FLD)
-#define L2_CTL_TAG_STALL_FLD		2
-#define L2_CTL_TAG_STALL_MASK		GENMASK(3, L2_CTL_TAG_STALL_FLD)
-#define L2_CTL_WS_STALL_FLD		4
-#define L2_CTL_WS_STALL_MASK		GENMASK(5, L2_CTL_WS_STALL_FLD)
-#define L2_CTL_SET_CLKRATIO		BIT(13)
-#define L2_CTL_CLKRATIO_LOCK		BIT(31)
-
-#define L2_CTL_STALL_MIN		0
-#define L2_CTL_STALL_MAX		3
-#define L2_CTL_STALL_SET_DELAY_US	1
-#define L2_CTL_STALL_SET_TOUT_US	1000
-
-/*
- * struct l2_ctl - Baikal-T1 L2 Control block private data.
- * @dev: Pointer to the device structure.
- * @sys_regs: Baikal-T1 System Controller registers map.
- */
-struct l2_ctl {
-	struct device *dev;
-
-	struct regmap *sys_regs;
-};
-
-/*
- * enum l2_ctl_stall - Baikal-T1 L2-cache-RAM stall identifier.
- * @L2_WSSTALL: Way-select latency.
- * @L2_TAGSTALL: Tag latency.
- * @L2_DATASTALL: Data latency.
- */
-enum l2_ctl_stall {
-	L2_WS_STALL,
-	L2_TAG_STALL,
-	L2_DATA_STALL
-};
-
-/*
- * struct l2_ctl_device_attribute - Baikal-T1 L2-cache device attribute.
- * @dev_attr: Actual sysfs device attribute.
- * @id: L2-cache stall field identifier.
- */
-struct l2_ctl_device_attribute {
-	struct device_attribute dev_attr;
-	enum l2_ctl_stall id;
-};
-
-#define to_l2_ctl_dev_attr(_dev_attr) \
-	container_of(_dev_attr, struct l2_ctl_device_attribute, dev_attr)
-
-#define L2_CTL_ATTR_RW(_name, _prefix, _id) \
-	struct l2_ctl_device_attribute l2_ctl_attr_##_name = \
-		{ __ATTR(_name, 0644, _prefix##_show, _prefix##_store),	_id }
-
-static int l2_ctl_get_latency(struct l2_ctl *l2, enum l2_ctl_stall id, u32 *val)
-{
-	u32 data = 0;
-	int ret;
-
-	ret = regmap_read(l2->sys_regs, L2_CTL_REG, &data);
-	if (ret)
-		return ret;
-
-	switch (id) {
-	case L2_WS_STALL:
-		*val = FIELD_GET(L2_CTL_WS_STALL_MASK, data);
-		break;
-	case L2_TAG_STALL:
-		*val = FIELD_GET(L2_CTL_TAG_STALL_MASK, data);
-		break;
-	case L2_DATA_STALL:
-		*val = FIELD_GET(L2_CTL_DATA_STALL_MASK, data);
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int l2_ctl_set_latency(struct l2_ctl *l2, enum l2_ctl_stall id, u32 val)
-{
-	u32 mask = 0, data = 0;
-	int ret;
-
-	val = clamp_val(val, L2_CTL_STALL_MIN, L2_CTL_STALL_MAX);
-
-	switch (id) {
-	case L2_WS_STALL:
-		data = FIELD_PREP(L2_CTL_WS_STALL_MASK, val);
-		mask = L2_CTL_WS_STALL_MASK;
-		break;
-	case L2_TAG_STALL:
-		data = FIELD_PREP(L2_CTL_TAG_STALL_MASK, val);
-		mask = L2_CTL_TAG_STALL_MASK;
-		break;
-	case L2_DATA_STALL:
-		data = FIELD_PREP(L2_CTL_DATA_STALL_MASK, val);
-		mask = L2_CTL_DATA_STALL_MASK;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	data |= L2_CTL_SET_CLKRATIO;
-	mask |= L2_CTL_SET_CLKRATIO;
-
-	ret = regmap_update_bits(l2->sys_regs, L2_CTL_REG, mask, data);
-	if (ret)
-		return ret;
-
-	return regmap_read_poll_timeout(l2->sys_regs, L2_CTL_REG, data,
-					data & L2_CTL_CLKRATIO_LOCK,
-					L2_CTL_STALL_SET_DELAY_US,
-					L2_CTL_STALL_SET_TOUT_US);
-}
-
-static void l2_ctl_clear_data(void *data)
-{
-	struct l2_ctl *l2 = data;
-	struct platform_device *pdev = to_platform_device(l2->dev);
-
-	platform_set_drvdata(pdev, NULL);
-}
-
-static struct l2_ctl *l2_ctl_create_data(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct l2_ctl *l2;
-	int ret;
-
-	l2 = devm_kzalloc(dev, sizeof(*l2), GFP_KERNEL);
-	if (!l2)
-		return ERR_PTR(-ENOMEM);
-
-	ret = devm_add_action(dev, l2_ctl_clear_data, l2);
-	if (ret) {
-		dev_err(dev, "Can't add L2 CTL data clear action\n");
-		return ERR_PTR(ret);
-	}
-
-	l2->dev = dev;
-	platform_set_drvdata(pdev, l2);
-
-	return l2;
-}
-
-static int l2_ctl_find_sys_regs(struct l2_ctl *l2)
-{
-	l2->sys_regs = syscon_node_to_regmap(l2->dev->of_node->parent);
-	if (IS_ERR(l2->sys_regs)) {
-		dev_err(l2->dev, "Couldn't get L2 CTL register map\n");
-		return PTR_ERR(l2->sys_regs);
-	}
-
-	return 0;
-}
-
-static int l2_ctl_of_parse_property(struct l2_ctl *l2, enum l2_ctl_stall id,
-				    const char *propname)
-{
-	int ret = 0;
-	u32 data;
-
-	if (!of_property_read_u32(l2->dev->of_node, propname, &data)) {
-		ret = l2_ctl_set_latency(l2, id, data);
-		if (ret)
-			dev_err(l2->dev, "Invalid value of '%s'\n", propname);
-	}
-
-	return ret;
-}
-
-static int l2_ctl_of_parse(struct l2_ctl *l2)
-{
-	int ret;
-
-	ret = l2_ctl_of_parse_property(l2, L2_WS_STALL, "baikal,l2-ws-latency");
-	if (ret)
-		return ret;
-
-	ret = l2_ctl_of_parse_property(l2, L2_TAG_STALL, "baikal,l2-tag-latency");
-	if (ret)
-		return ret;
-
-	return l2_ctl_of_parse_property(l2, L2_DATA_STALL,
-					"baikal,l2-data-latency");
-}
-
-static ssize_t l2_ctl_latency_show(struct device *dev,
-				   struct device_attribute *attr,
-				   char *buf)
-{
-	struct l2_ctl_device_attribute *devattr = to_l2_ctl_dev_attr(attr);
-	struct l2_ctl *l2 = dev_get_drvdata(dev);
-	u32 data;
-	int ret;
-
-	ret = l2_ctl_get_latency(l2, devattr->id, &data);
-	if (ret)
-		return ret;
-
-	return sysfs_emit(buf, "%u\n", data);
-}
-
-static ssize_t l2_ctl_latency_store(struct device *dev,
-				    struct device_attribute *attr,
-				    const char *buf, size_t count)
-{
-	struct l2_ctl_device_attribute *devattr = to_l2_ctl_dev_attr(attr);
-	struct l2_ctl *l2 = dev_get_drvdata(dev);
-	u32 data;
-	int ret;
-
-	if (kstrtouint(buf, 0, &data) < 0)
-		return -EINVAL;
-
-	ret = l2_ctl_set_latency(l2, devattr->id, data);
-	if (ret)
-		return ret;
-
-	return count;
-}
-
-static L2_CTL_ATTR_RW(l2_ws_latency, l2_ctl_latency, L2_WS_STALL);
-static L2_CTL_ATTR_RW(l2_tag_latency, l2_ctl_latency, L2_TAG_STALL);
-static L2_CTL_ATTR_RW(l2_data_latency, l2_ctl_latency, L2_DATA_STALL);
-
-static struct attribute *l2_ctl_sysfs_attrs[] = {
-	&l2_ctl_attr_l2_ws_latency.dev_attr.attr,
-	&l2_ctl_attr_l2_tag_latency.dev_attr.attr,
-	&l2_ctl_attr_l2_data_latency.dev_attr.attr,
-	NULL
-};
-ATTRIBUTE_GROUPS(l2_ctl_sysfs);
-
-static void l2_ctl_remove_sysfs(void *data)
-{
-	struct l2_ctl *l2 = data;
-
-	device_remove_groups(l2->dev, l2_ctl_sysfs_groups);
-}
-
-static int l2_ctl_init_sysfs(struct l2_ctl *l2)
-{
-	int ret;
-
-	ret = device_add_groups(l2->dev, l2_ctl_sysfs_groups);
-	if (ret) {
-		dev_err(l2->dev, "Failed to create L2 CTL sysfs nodes\n");
-		return ret;
-	}
-
-	ret = devm_add_action_or_reset(l2->dev, l2_ctl_remove_sysfs, l2);
-	if (ret)
-		dev_err(l2->dev, "Can't add L2 CTL sysfs remove action\n");
-
-	return ret;
-}
-
-static int l2_ctl_probe(struct platform_device *pdev)
-{
-	struct l2_ctl *l2;
-	int ret;
-
-	l2 = l2_ctl_create_data(pdev);
-	if (IS_ERR(l2))
-		return PTR_ERR(l2);
-
-	ret = l2_ctl_find_sys_regs(l2);
-	if (ret)
-		return ret;
-
-	ret = l2_ctl_of_parse(l2);
-	if (ret)
-		return ret;
-
-	ret = l2_ctl_init_sysfs(l2);
-	if (ret)
-		return ret;
-
-	return 0;
-}
-
-static const struct of_device_id l2_ctl_of_match[] = {
-	{ .compatible = "baikal,bt1-l2-ctl" },
-	{ }
-};
-MODULE_DEVICE_TABLE(of, l2_ctl_of_match);
-
-static struct platform_driver l2_ctl_driver = {
-	.probe = l2_ctl_probe,
-	.driver = {
-		.name = "bt1-l2-ctl",
-		.of_match_table = l2_ctl_of_match
-	}
-};
-module_platform_driver(l2_ctl_driver);
-
-MODULE_AUTHOR("Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>");
-MODULE_DESCRIPTION("Baikal-T1 L2-cache driver");
-- 
2.50.1