memory: Add Baikal-T1 L2-cache Control Block driver
Baikal-T1 SoC provides a way to tune the MIPS P5600 CM2 L2-cache performance up. It can be done by changing the L2-RAM Data/Tag/WS latencies in a dedicated register exposed by the system controller. The driver added by this commit provides a dts properties-based and sysfs-based interface for it. The device DT node is supposed to be a child of Baikal-T1 System Controller node. Link: https://lore.kernel.org/r/20200526125928.17096-7-Sergey.Semin@baikalelectronics.ru Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru> Cc: Paul Burton <paulburton@kernel.org> Cc: Olof Johansson <olof@lixom.net> Cc: Rob Herring <robh+dt@kernel.org> Cc: linux-mips@vger.kernel.org Cc: soc@kernel.org Cc: devicetree@vger.kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Serge Semin
Arnd Bergmann
parent
8f93662d83
commit
83ca8b3e8f
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@ -46,6 +46,17 @@ config ATMEL_EBI
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tree is used. This bus supports NANDs, external ethernet controller,
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SRAMs, ATA devices, etc.
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config BT1_L2_CTL
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bool "Baikal-T1 CM2 L2-RAM Cache Control Block"
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depends on MIPS_BAIKAL_T1 || COMPILE_TEST
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select MFD_SYSCON
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help
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Baikal-T1 CPU is based on the MIPS P5600 Warrior IP-core. The CPU
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resides Coherency Manager v2 with embedded 1MB L2-cache. It's
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possible to tune the L2 cache performance up by setting the data,
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tags and way-select latencies of RAM access. This driver provides a
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dt properties-based and sysfs interface for it.
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config TI_AEMIF
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tristate "Texas Instruments AEMIF driver"
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depends on (ARCH_DAVINCI || ARCH_KEYSTONE) && OF
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@ -11,6 +11,7 @@ obj-$(CONFIG_ARM_PL172_MPMC) += pl172.o
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obj-$(CONFIG_ATMEL_SDRAMC) += atmel-sdramc.o
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obj-$(CONFIG_ATMEL_EBI) += atmel-ebi.o
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obj-$(CONFIG_ARCH_BRCMSTB) += brcmstb_dpfe.o
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obj-$(CONFIG_BT1_L2_CTL) += bt1-l2-ctl.o
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obj-$(CONFIG_TI_AEMIF) += ti-aemif.o
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obj-$(CONFIG_TI_EMIF) += emif.o
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obj-$(CONFIG_OMAP_GPMC) += omap-gpmc.o
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@ -0,0 +1,322 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
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*
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* Authors:
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* Serge Semin <Sergey.Semin@baikalelectronics.ru>
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*
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* Baikal-T1 CM2 L2-cache Control Block driver.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/bitfield.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/mfd/syscon.h>
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#include <linux/sysfs.h>
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#include <linux/of.h>
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#define L2_CTL_REG 0x028
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#define L2_CTL_DATA_STALL_FLD 0
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#define L2_CTL_DATA_STALL_MASK GENMASK(1, L2_CTL_DATA_STALL_FLD)
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#define L2_CTL_TAG_STALL_FLD 2
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#define L2_CTL_TAG_STALL_MASK GENMASK(3, L2_CTL_TAG_STALL_FLD)
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#define L2_CTL_WS_STALL_FLD 4
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#define L2_CTL_WS_STALL_MASK GENMASK(5, L2_CTL_WS_STALL_FLD)
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#define L2_CTL_SET_CLKRATIO BIT(13)
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#define L2_CTL_CLKRATIO_LOCK BIT(31)
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#define L2_CTL_STALL_MIN 0
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#define L2_CTL_STALL_MAX 3
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#define L2_CTL_STALL_SET_DELAY_US 1
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#define L2_CTL_STALL_SET_TOUT_US 1000
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/*
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* struct l2_ctl - Baikal-T1 L2 Control block private data.
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* @dev: Pointer to the device structure.
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* @sys_regs: Baikal-T1 System Controller registers map.
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*/
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struct l2_ctl {
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struct device *dev;
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struct regmap *sys_regs;
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};
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/*
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* enum l2_ctl_stall - Baikal-T1 L2-cache-RAM stall identifier.
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* @L2_WSSTALL: Way-select latency.
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* @L2_TAGSTALL: Tag latency.
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* @L2_DATASTALL: Data latency.
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*/
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enum l2_ctl_stall {
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L2_WS_STALL,
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L2_TAG_STALL,
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L2_DATA_STALL
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};
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/*
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* struct l2_ctl_device_attribute - Baikal-T1 L2-cache device attribute.
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* @dev_attr: Actual sysfs device attribute.
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* @id: L2-cache stall field identifier.
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*/
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struct l2_ctl_device_attribute {
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struct device_attribute dev_attr;
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enum l2_ctl_stall id;
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};
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#define to_l2_ctl_dev_attr(_dev_attr) \
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container_of(_dev_attr, struct l2_ctl_device_attribute, dev_attr)
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#define L2_CTL_ATTR_RW(_name, _prefix, _id) \
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struct l2_ctl_device_attribute l2_ctl_attr_##_name = \
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{ __ATTR(_name, 0644, _prefix##_show, _prefix##_store), _id }
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static int l2_ctl_get_latency(struct l2_ctl *l2, enum l2_ctl_stall id, u32 *val)
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{
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u32 data = 0;
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int ret;
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ret = regmap_read(l2->sys_regs, L2_CTL_REG, &data);
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if (ret)
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return ret;
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switch (id) {
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case L2_WS_STALL:
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*val = FIELD_GET(L2_CTL_WS_STALL_MASK, data);
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break;
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case L2_TAG_STALL:
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*val = FIELD_GET(L2_CTL_TAG_STALL_MASK, data);
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break;
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case L2_DATA_STALL:
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*val = FIELD_GET(L2_CTL_DATA_STALL_MASK, data);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int l2_ctl_set_latency(struct l2_ctl *l2, enum l2_ctl_stall id, u32 val)
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{
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u32 mask = 0, data = 0;
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int ret;
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val = clamp_val(val, L2_CTL_STALL_MIN, L2_CTL_STALL_MAX);
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switch (id) {
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case L2_WS_STALL:
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data = FIELD_PREP(L2_CTL_WS_STALL_MASK, val);
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mask = L2_CTL_WS_STALL_MASK;
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break;
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case L2_TAG_STALL:
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data = FIELD_PREP(L2_CTL_TAG_STALL_MASK, val);
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mask = L2_CTL_TAG_STALL_MASK;
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break;
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case L2_DATA_STALL:
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data = FIELD_PREP(L2_CTL_DATA_STALL_MASK, val);
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mask = L2_CTL_DATA_STALL_MASK;
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break;
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default:
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return -EINVAL;
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}
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data |= L2_CTL_SET_CLKRATIO;
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mask |= L2_CTL_SET_CLKRATIO;
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ret = regmap_update_bits(l2->sys_regs, L2_CTL_REG, mask, data);
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if (ret)
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return ret;
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return regmap_read_poll_timeout(l2->sys_regs, L2_CTL_REG, data,
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data & L2_CTL_CLKRATIO_LOCK,
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L2_CTL_STALL_SET_DELAY_US,
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L2_CTL_STALL_SET_TOUT_US);
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}
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static void l2_ctl_clear_data(void *data)
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{
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struct l2_ctl *l2 = data;
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struct platform_device *pdev = to_platform_device(l2->dev);
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platform_set_drvdata(pdev, NULL);
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}
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static struct l2_ctl *l2_ctl_create_data(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct l2_ctl *l2;
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int ret;
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l2 = devm_kzalloc(dev, sizeof(*l2), GFP_KERNEL);
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if (!l2)
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return ERR_PTR(-ENOMEM);
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ret = devm_add_action(dev, l2_ctl_clear_data, l2);
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if (ret) {
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dev_err(dev, "Can't add L2 CTL data clear action\n");
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return ERR_PTR(ret);
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}
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l2->dev = dev;
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platform_set_drvdata(pdev, l2);
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return l2;
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}
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static int l2_ctl_find_sys_regs(struct l2_ctl *l2)
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{
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l2->sys_regs = syscon_node_to_regmap(l2->dev->of_node->parent);
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if (IS_ERR(l2->sys_regs)) {
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dev_err(l2->dev, "Couldn't get L2 CTL register map\n");
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return PTR_ERR(l2->sys_regs);
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}
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return 0;
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}
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static int l2_ctl_of_parse_property(struct l2_ctl *l2, enum l2_ctl_stall id,
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const char *propname)
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{
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int ret = 0;
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u32 data;
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if (!of_property_read_u32(l2->dev->of_node, propname, &data)) {
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ret = l2_ctl_set_latency(l2, id, data);
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if (ret)
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dev_err(l2->dev, "Invalid value of '%s'\n", propname);
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}
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return ret;
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}
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static int l2_ctl_of_parse(struct l2_ctl *l2)
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{
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int ret;
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ret = l2_ctl_of_parse_property(l2, L2_WS_STALL, "baikal,l2-ws-latency");
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if (ret)
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return ret;
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ret = l2_ctl_of_parse_property(l2, L2_TAG_STALL, "baikal,l2-tag-latency");
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if (ret)
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return ret;
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return l2_ctl_of_parse_property(l2, L2_DATA_STALL,
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"baikal,l2-data-latency");
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}
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static ssize_t l2_ctl_latency_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct l2_ctl_device_attribute *devattr = to_l2_ctl_dev_attr(attr);
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struct l2_ctl *l2 = dev_get_drvdata(dev);
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u32 data;
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int ret;
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ret = l2_ctl_get_latency(l2, devattr->id, &data);
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if (ret)
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return ret;
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return scnprintf(buf, PAGE_SIZE, "%u\n", data);
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}
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static ssize_t l2_ctl_latency_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct l2_ctl_device_attribute *devattr = to_l2_ctl_dev_attr(attr);
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struct l2_ctl *l2 = dev_get_drvdata(dev);
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u32 data;
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int ret;
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if (kstrtouint(buf, 0, &data) < 0)
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return -EINVAL;
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ret = l2_ctl_set_latency(l2, devattr->id, data);
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if (ret)
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return ret;
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return count;
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}
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static L2_CTL_ATTR_RW(l2_ws_latency, l2_ctl_latency, L2_WS_STALL);
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static L2_CTL_ATTR_RW(l2_tag_latency, l2_ctl_latency, L2_TAG_STALL);
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static L2_CTL_ATTR_RW(l2_data_latency, l2_ctl_latency, L2_DATA_STALL);
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static struct attribute *l2_ctl_sysfs_attrs[] = {
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&l2_ctl_attr_l2_ws_latency.dev_attr.attr,
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&l2_ctl_attr_l2_tag_latency.dev_attr.attr,
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&l2_ctl_attr_l2_data_latency.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(l2_ctl_sysfs);
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static void l2_ctl_remove_sysfs(void *data)
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{
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struct l2_ctl *l2 = data;
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device_remove_groups(l2->dev, l2_ctl_sysfs_groups);
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}
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static int l2_ctl_init_sysfs(struct l2_ctl *l2)
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{
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int ret;
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ret = device_add_groups(l2->dev, l2_ctl_sysfs_groups);
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if (ret) {
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dev_err(l2->dev, "Failed to create L2 CTL sysfs nodes\n");
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return ret;
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}
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ret = devm_add_action_or_reset(l2->dev, l2_ctl_remove_sysfs, l2);
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if (ret)
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dev_err(l2->dev, "Can't add L2 CTL sysfs remove action\n");
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return ret;
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}
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static int l2_ctl_probe(struct platform_device *pdev)
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{
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struct l2_ctl *l2;
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int ret;
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l2 = l2_ctl_create_data(pdev);
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if (IS_ERR(l2))
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return PTR_ERR(l2);
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ret = l2_ctl_find_sys_regs(l2);
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if (ret)
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return ret;
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ret = l2_ctl_of_parse(l2);
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if (ret)
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return ret;
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ret = l2_ctl_init_sysfs(l2);
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if (ret)
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return ret;
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return 0;
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}
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static const struct of_device_id l2_ctl_of_match[] = {
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{ .compatible = "baikal,bt1-l2-ctl" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, l2_ctl_of_match);
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static struct platform_driver l2_ctl_driver = {
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.probe = l2_ctl_probe,
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.driver = {
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.name = "bt1-l2-ctl",
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.of_match_table = l2_ctl_of_match
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}
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};
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module_platform_driver(l2_ctl_driver);
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MODULE_AUTHOR("Serge Semin <Sergey.Semin@baikalelectronics.ru>");
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MODULE_DESCRIPTION("Baikal-T1 L2-cache driver");
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MODULE_LICENSE("GPL v2");
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