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324 lines
7.3 KiB
324 lines
7.3 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Baikal-T1 L2-cache driver"); |
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MODULE_LICENSE("GPL v2");
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