1 /* 2 * Intel(R) Trace Hub Software Trace Hub support 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/io.h> 22 #include <linux/mm.h> 23 #include <linux/slab.h> 24 #include <linux/stm.h> 25 26 #include "intel_th.h" 27 #include "sth.h" 28 29 struct sth_device { 30 void __iomem *base; 31 void __iomem *channels; 32 phys_addr_t channels_phys; 33 struct device *dev; 34 struct stm_data stm; 35 unsigned int sw_nmasters; 36 }; 37 38 static struct intel_th_channel __iomem * 39 sth_channel(struct sth_device *sth, unsigned int master, unsigned int channel) 40 { 41 struct intel_th_channel __iomem *sw_map = sth->channels; 42 43 return &sw_map[(master - sth->stm.sw_start) * sth->stm.sw_nchannels + 44 channel]; 45 } 46 47 static void sth_iowrite(void __iomem *dest, const unsigned char *payload, 48 unsigned int size) 49 { 50 switch (size) { 51 #ifdef CONFIG_64BIT 52 case 8: 53 writeq_relaxed(*(u64 *)payload, dest); 54 break; 55 #endif 56 case 4: 57 writel_relaxed(*(u32 *)payload, dest); 58 break; 59 case 2: 60 writew_relaxed(*(u16 *)payload, dest); 61 break; 62 case 1: 63 writeb_relaxed(*(u8 *)payload, dest); 64 break; 65 default: 66 break; 67 } 68 } 69 70 static ssize_t sth_stm_packet(struct stm_data *stm_data, unsigned int master, 71 unsigned int channel, unsigned int packet, 72 unsigned int flags, unsigned int size, 73 const unsigned char *payload) 74 { 75 struct sth_device *sth = container_of(stm_data, struct sth_device, stm); 76 struct intel_th_channel __iomem *out = 77 sth_channel(sth, master, channel); 78 u64 __iomem *outp = &out->Dn; 79 unsigned long reg = REG_STH_TRIG; 80 81 #ifndef CONFIG_64BIT 82 if (size > 4) 83 size = 4; 84 #endif 85 86 size = rounddown_pow_of_two(size); 87 88 switch (packet) { 89 /* Global packets (GERR, XSYNC, TRIG) are sent with register writes */ 90 case STP_PACKET_GERR: 91 reg += 4; 92 case STP_PACKET_XSYNC: 93 reg += 8; 94 case STP_PACKET_TRIG: 95 if (flags & STP_PACKET_TIMESTAMPED) 96 reg += 4; 97 writeb_relaxed(*payload, sth->base + reg); 98 break; 99 100 case STP_PACKET_MERR: 101 if (size > 4) 102 size = 4; 103 104 sth_iowrite(&out->MERR, payload, size); 105 break; 106 107 case STP_PACKET_FLAG: 108 if (flags & STP_PACKET_TIMESTAMPED) 109 outp = (u64 __iomem *)&out->FLAG_TS; 110 else 111 outp = (u64 __iomem *)&out->FLAG; 112 113 size = 0; 114 writeb_relaxed(0, outp); 115 break; 116 117 case STP_PACKET_USER: 118 if (flags & STP_PACKET_TIMESTAMPED) 119 outp = &out->USER_TS; 120 else 121 outp = &out->USER; 122 sth_iowrite(outp, payload, size); 123 break; 124 125 case STP_PACKET_DATA: 126 outp = &out->Dn; 127 128 if (flags & STP_PACKET_TIMESTAMPED) 129 outp += 2; 130 if (flags & STP_PACKET_MARKED) 131 outp++; 132 133 sth_iowrite(outp, payload, size); 134 break; 135 default: 136 return -ENOTSUPP; 137 } 138 139 return size; 140 } 141 142 static phys_addr_t 143 sth_stm_mmio_addr(struct stm_data *stm_data, unsigned int master, 144 unsigned int channel, unsigned int nr_chans) 145 { 146 struct sth_device *sth = container_of(stm_data, struct sth_device, stm); 147 phys_addr_t addr; 148 149 master -= sth->stm.sw_start; 150 addr = sth->channels_phys + (master * sth->stm.sw_nchannels + channel) * 151 sizeof(struct intel_th_channel); 152 153 if (offset_in_page(addr) || 154 offset_in_page(nr_chans * sizeof(struct intel_th_channel))) 155 return 0; 156 157 return addr; 158 } 159 160 static int sth_stm_link(struct stm_data *stm_data, unsigned int master, 161 unsigned int channel) 162 { 163 struct sth_device *sth = container_of(stm_data, struct sth_device, stm); 164 165 intel_th_set_output(to_intel_th_device(sth->dev), master); 166 167 return 0; 168 } 169 170 static int intel_th_sw_init(struct sth_device *sth) 171 { 172 u32 reg; 173 174 reg = ioread32(sth->base + REG_STH_STHCAP1); 175 sth->stm.sw_nchannels = reg & 0xff; 176 177 reg = ioread32(sth->base + REG_STH_STHCAP0); 178 sth->stm.sw_start = reg & 0xffff; 179 sth->stm.sw_end = reg >> 16; 180 181 sth->sw_nmasters = sth->stm.sw_end - sth->stm.sw_start; 182 dev_dbg(sth->dev, "sw_start: %x sw_end: %x masters: %x nchannels: %x\n", 183 sth->stm.sw_start, sth->stm.sw_end, sth->sw_nmasters, 184 sth->stm.sw_nchannels); 185 186 return 0; 187 } 188 189 static int intel_th_sth_probe(struct intel_th_device *thdev) 190 { 191 struct device *dev = &thdev->dev; 192 struct sth_device *sth; 193 struct resource *res; 194 void __iomem *base, *channels; 195 int err; 196 197 res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0); 198 if (!res) 199 return -ENODEV; 200 201 base = devm_ioremap(dev, res->start, resource_size(res)); 202 if (!base) 203 return -ENOMEM; 204 205 res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 1); 206 if (!res) 207 return -ENODEV; 208 209 channels = devm_ioremap(dev, res->start, resource_size(res)); 210 if (!channels) 211 return -ENOMEM; 212 213 sth = devm_kzalloc(dev, sizeof(*sth), GFP_KERNEL); 214 if (!sth) 215 return -ENOMEM; 216 217 sth->dev = dev; 218 sth->base = base; 219 sth->channels = channels; 220 sth->channels_phys = res->start; 221 sth->stm.name = dev_name(dev); 222 sth->stm.packet = sth_stm_packet; 223 sth->stm.mmio_addr = sth_stm_mmio_addr; 224 sth->stm.sw_mmiosz = sizeof(struct intel_th_channel); 225 sth->stm.link = sth_stm_link; 226 227 err = intel_th_sw_init(sth); 228 if (err) 229 return err; 230 231 err = stm_register_device(dev, &sth->stm, THIS_MODULE); 232 if (err) { 233 dev_err(dev, "stm_register_device failed\n"); 234 return err; 235 } 236 237 dev_set_drvdata(dev, sth); 238 239 return 0; 240 } 241 242 static void intel_th_sth_remove(struct intel_th_device *thdev) 243 { 244 struct sth_device *sth = dev_get_drvdata(&thdev->dev); 245 246 stm_unregister_device(&sth->stm); 247 } 248 249 static struct intel_th_driver intel_th_sth_driver = { 250 .probe = intel_th_sth_probe, 251 .remove = intel_th_sth_remove, 252 .driver = { 253 .name = "sth", 254 .owner = THIS_MODULE, 255 }, 256 }; 257 258 module_driver(intel_th_sth_driver, 259 intel_th_driver_register, 260 intel_th_driver_unregister); 261 262 MODULE_LICENSE("GPL v2"); 263 MODULE_DESCRIPTION("Intel(R) Trace Hub Software Trace Hub driver"); 264 MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>"); 265