Alexander Shishkin | 14cdbf0 | 2015-09-22 15:47:19 +0300 | [diff] [blame] | 1 | /* |
| 2 | * Intel(R) Trace Hub PTI output driver |
| 3 | * |
| 4 | * Copyright (C) 2014-2015 Intel Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | */ |
| 15 | |
| 16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 17 | |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/device.h> |
| 21 | #include <linux/sizes.h> |
| 22 | #include <linux/printk.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/mm.h> |
| 25 | #include <linux/io.h> |
| 26 | |
| 27 | #include "intel_th.h" |
| 28 | #include "pti.h" |
| 29 | |
| 30 | struct pti_device { |
| 31 | void __iomem *base; |
| 32 | struct intel_th_device *thdev; |
| 33 | unsigned int mode; |
| 34 | unsigned int freeclk; |
| 35 | unsigned int clkdiv; |
| 36 | unsigned int patgen; |
| 37 | }; |
| 38 | |
| 39 | /* map PTI widths to MODE settings of PTI_CTL register */ |
| 40 | static const unsigned int pti_mode[] = { |
| 41 | 0, 4, 8, 0, 12, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0, |
| 42 | }; |
| 43 | |
| 44 | static int pti_width_mode(unsigned int width) |
| 45 | { |
| 46 | int i; |
| 47 | |
| 48 | for (i = 0; i < ARRAY_SIZE(pti_mode); i++) |
| 49 | if (pti_mode[i] == width) |
| 50 | return i; |
| 51 | |
| 52 | return -EINVAL; |
| 53 | } |
| 54 | |
| 55 | static ssize_t mode_show(struct device *dev, struct device_attribute *attr, |
| 56 | char *buf) |
| 57 | { |
| 58 | struct pti_device *pti = dev_get_drvdata(dev); |
| 59 | |
| 60 | return scnprintf(buf, PAGE_SIZE, "%d\n", pti_mode[pti->mode]); |
| 61 | } |
| 62 | |
| 63 | static ssize_t mode_store(struct device *dev, struct device_attribute *attr, |
| 64 | const char *buf, size_t size) |
| 65 | { |
| 66 | struct pti_device *pti = dev_get_drvdata(dev); |
| 67 | unsigned long val; |
| 68 | int ret; |
| 69 | |
| 70 | ret = kstrtoul(buf, 10, &val); |
| 71 | if (ret) |
| 72 | return ret; |
| 73 | |
| 74 | ret = pti_width_mode(val); |
| 75 | if (ret < 0) |
| 76 | return ret; |
| 77 | |
| 78 | pti->mode = ret; |
| 79 | |
| 80 | return size; |
| 81 | } |
| 82 | |
| 83 | static DEVICE_ATTR_RW(mode); |
| 84 | |
| 85 | static ssize_t |
| 86 | freerunning_clock_show(struct device *dev, struct device_attribute *attr, |
| 87 | char *buf) |
| 88 | { |
| 89 | struct pti_device *pti = dev_get_drvdata(dev); |
| 90 | |
| 91 | return scnprintf(buf, PAGE_SIZE, "%d\n", pti->freeclk); |
| 92 | } |
| 93 | |
| 94 | static ssize_t |
| 95 | freerunning_clock_store(struct device *dev, struct device_attribute *attr, |
| 96 | const char *buf, size_t size) |
| 97 | { |
| 98 | struct pti_device *pti = dev_get_drvdata(dev); |
| 99 | unsigned long val; |
| 100 | int ret; |
| 101 | |
| 102 | ret = kstrtoul(buf, 10, &val); |
| 103 | if (ret) |
| 104 | return ret; |
| 105 | |
| 106 | pti->freeclk = !!val; |
| 107 | |
| 108 | return size; |
| 109 | } |
| 110 | |
| 111 | static DEVICE_ATTR_RW(freerunning_clock); |
| 112 | |
| 113 | static ssize_t |
| 114 | clock_divider_show(struct device *dev, struct device_attribute *attr, |
| 115 | char *buf) |
| 116 | { |
| 117 | struct pti_device *pti = dev_get_drvdata(dev); |
| 118 | |
| 119 | return scnprintf(buf, PAGE_SIZE, "%d\n", 1u << pti->clkdiv); |
| 120 | } |
| 121 | |
| 122 | static ssize_t |
| 123 | clock_divider_store(struct device *dev, struct device_attribute *attr, |
| 124 | const char *buf, size_t size) |
| 125 | { |
| 126 | struct pti_device *pti = dev_get_drvdata(dev); |
| 127 | unsigned long val; |
| 128 | int ret; |
| 129 | |
| 130 | ret = kstrtoul(buf, 10, &val); |
| 131 | if (ret) |
| 132 | return ret; |
| 133 | |
| 134 | if (!is_power_of_2(val) || val > 8 || !val) |
| 135 | return -EINVAL; |
| 136 | |
| 137 | pti->clkdiv = val; |
| 138 | |
| 139 | return size; |
| 140 | } |
| 141 | |
| 142 | static DEVICE_ATTR_RW(clock_divider); |
| 143 | |
| 144 | static struct attribute *pti_output_attrs[] = { |
| 145 | &dev_attr_mode.attr, |
| 146 | &dev_attr_freerunning_clock.attr, |
| 147 | &dev_attr_clock_divider.attr, |
| 148 | NULL, |
| 149 | }; |
| 150 | |
| 151 | static struct attribute_group pti_output_group = { |
| 152 | .attrs = pti_output_attrs, |
| 153 | }; |
| 154 | |
| 155 | static int intel_th_pti_activate(struct intel_th_device *thdev) |
| 156 | { |
| 157 | struct pti_device *pti = dev_get_drvdata(&thdev->dev); |
| 158 | u32 ctl = PTI_EN; |
| 159 | |
| 160 | if (pti->patgen) |
| 161 | ctl |= pti->patgen << __ffs(PTI_PATGENMODE); |
| 162 | if (pti->freeclk) |
| 163 | ctl |= PTI_FCEN; |
| 164 | ctl |= pti->mode << __ffs(PTI_MODE); |
| 165 | ctl |= pti->clkdiv << __ffs(PTI_CLKDIV); |
| 166 | |
| 167 | iowrite32(ctl, pti->base + REG_PTI_CTL); |
| 168 | |
| 169 | intel_th_trace_enable(thdev); |
| 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | static void intel_th_pti_deactivate(struct intel_th_device *thdev) |
| 175 | { |
| 176 | struct pti_device *pti = dev_get_drvdata(&thdev->dev); |
| 177 | |
| 178 | intel_th_trace_disable(thdev); |
| 179 | |
| 180 | iowrite32(0, pti->base + REG_PTI_CTL); |
| 181 | } |
| 182 | |
| 183 | static void read_hw_config(struct pti_device *pti) |
| 184 | { |
| 185 | u32 ctl = ioread32(pti->base + REG_PTI_CTL); |
| 186 | |
| 187 | pti->mode = (ctl & PTI_MODE) >> __ffs(PTI_MODE); |
| 188 | pti->clkdiv = (ctl & PTI_CLKDIV) >> __ffs(PTI_CLKDIV); |
| 189 | pti->freeclk = !!(ctl & PTI_FCEN); |
| 190 | |
| 191 | if (!pti_mode[pti->mode]) |
| 192 | pti->mode = pti_width_mode(4); |
| 193 | if (!pti->clkdiv) |
| 194 | pti->clkdiv = 1; |
| 195 | } |
| 196 | |
| 197 | static int intel_th_pti_probe(struct intel_th_device *thdev) |
| 198 | { |
| 199 | struct device *dev = &thdev->dev; |
| 200 | struct resource *res; |
| 201 | struct pti_device *pti; |
| 202 | void __iomem *base; |
Alexander Shishkin | 14cdbf0 | 2015-09-22 15:47:19 +0300 | [diff] [blame] | 203 | |
| 204 | res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0); |
| 205 | if (!res) |
| 206 | return -ENODEV; |
| 207 | |
| 208 | base = devm_ioremap(dev, res->start, resource_size(res)); |
Dan Carpenter | 73061da | 2015-10-16 17:09:13 +0300 | [diff] [blame] | 209 | if (!base) |
| 210 | return -ENOMEM; |
Alexander Shishkin | 14cdbf0 | 2015-09-22 15:47:19 +0300 | [diff] [blame] | 211 | |
| 212 | pti = devm_kzalloc(dev, sizeof(*pti), GFP_KERNEL); |
| 213 | if (!pti) |
| 214 | return -ENOMEM; |
| 215 | |
| 216 | pti->thdev = thdev; |
| 217 | pti->base = base; |
| 218 | |
| 219 | read_hw_config(pti); |
| 220 | |
Alexander Shishkin | 14cdbf0 | 2015-09-22 15:47:19 +0300 | [diff] [blame] | 221 | dev_set_drvdata(dev, pti); |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | static void intel_th_pti_remove(struct intel_th_device *thdev) |
| 227 | { |
Alexander Shishkin | 14cdbf0 | 2015-09-22 15:47:19 +0300 | [diff] [blame] | 228 | } |
| 229 | |
| 230 | static struct intel_th_driver intel_th_pti_driver = { |
| 231 | .probe = intel_th_pti_probe, |
| 232 | .remove = intel_th_pti_remove, |
| 233 | .activate = intel_th_pti_activate, |
| 234 | .deactivate = intel_th_pti_deactivate, |
Alexander Shishkin | e8644e4 | 2016-03-04 19:55:10 +0200 | [diff] [blame] | 235 | .attr_group = &pti_output_group, |
Alexander Shishkin | 14cdbf0 | 2015-09-22 15:47:19 +0300 | [diff] [blame] | 236 | .driver = { |
| 237 | .name = "pti", |
| 238 | .owner = THIS_MODULE, |
| 239 | }, |
| 240 | }; |
| 241 | |
| 242 | module_driver(intel_th_pti_driver, |
| 243 | intel_th_driver_register, |
| 244 | intel_th_driver_unregister); |
| 245 | |
| 246 | MODULE_LICENSE("GPL v2"); |
| 247 | MODULE_DESCRIPTION("Intel(R) Trace Hub PTI output driver"); |
| 248 | MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); |