1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Intel(R) Trace Hub Software Trace Hub support 4 * 5 * Copyright (C) 2014-2015 Intel Corporation. 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/types.h> 11 #include <linux/module.h> 12 #include <linux/device.h> 13 #include <linux/io.h> 14 #include <linux/mm.h> 15 #include <linux/slab.h> 16 #include <linux/stm.h> 17 18 #include "intel_th.h" 19 #include "sth.h" 20 21 struct sth_device { 22 void __iomem *base; 23 void __iomem *channels; 24 phys_addr_t channels_phys; 25 struct device *dev; 26 struct stm_data stm; 27 unsigned int sw_nmasters; 28 }; 29 30 static struct intel_th_channel __iomem * 31 sth_channel(struct sth_device *sth, unsigned int master, unsigned int channel) 32 { 33 struct intel_th_channel __iomem *sw_map = sth->channels; 34 35 return &sw_map[(master - sth->stm.sw_start) * sth->stm.sw_nchannels + 36 channel]; 37 } 38 39 static void sth_iowrite(void __iomem *dest, const unsigned char *payload, 40 unsigned int size) 41 { 42 switch (size) { 43 #ifdef CONFIG_64BIT 44 case 8: 45 writeq_relaxed(*(u64 *)payload, dest); 46 break; 47 #endif 48 case 4: 49 writel_relaxed(*(u32 *)payload, dest); 50 break; 51 case 2: 52 writew_relaxed(*(u16 *)payload, dest); 53 break; 54 case 1: 55 writeb_relaxed(*(u8 *)payload, dest); 56 break; 57 default: 58 break; 59 } 60 } 61 62 static ssize_t notrace sth_stm_packet(struct stm_data *stm_data, 63 unsigned int master, 64 unsigned int channel, 65 unsigned int packet, 66 unsigned int flags, 67 unsigned int size, 68 const unsigned char *payload) 69 { 70 struct sth_device *sth = container_of(stm_data, struct sth_device, stm); 71 struct intel_th_channel __iomem *out = 72 sth_channel(sth, master, channel); 73 u64 __iomem *outp = &out->Dn; 74 unsigned long reg = REG_STH_TRIG; 75 76 #ifndef CONFIG_64BIT 77 if (size > 4) 78 size = 4; 79 #endif 80 81 size = rounddown_pow_of_two(size); 82 83 switch (packet) { 84 /* Global packets (GERR, XSYNC, TRIG) are sent with register writes */ 85 case STP_PACKET_GERR: 86 reg += 4; 87 fallthrough; 88 89 case STP_PACKET_XSYNC: 90 reg += 8; 91 fallthrough; 92 93 case STP_PACKET_TRIG: 94 if (flags & STP_PACKET_TIMESTAMPED) 95 reg += 4; 96 writeb_relaxed(*payload, sth->base + reg); 97 break; 98 99 case STP_PACKET_MERR: 100 if (size > 4) 101 size = 4; 102 103 sth_iowrite(&out->MERR, payload, size); 104 break; 105 106 case STP_PACKET_FLAG: 107 if (flags & STP_PACKET_TIMESTAMPED) 108 outp = (u64 __iomem *)&out->FLAG_TS; 109 else 110 outp = (u64 __iomem *)&out->FLAG; 111 112 size = 0; 113 writeb_relaxed(0, outp); 114 break; 115 116 case STP_PACKET_USER: 117 if (flags & STP_PACKET_TIMESTAMPED) 118 outp = &out->USER_TS; 119 else 120 outp = &out->USER; 121 sth_iowrite(outp, payload, size); 122 break; 123 124 case STP_PACKET_DATA: 125 outp = &out->Dn; 126 127 if (flags & STP_PACKET_TIMESTAMPED) 128 outp += 2; 129 if (flags & STP_PACKET_MARKED) 130 outp++; 131 132 sth_iowrite(outp, payload, size); 133 break; 134 default: 135 return -ENOTSUPP; 136 } 137 138 return size; 139 } 140 141 static phys_addr_t 142 sth_stm_mmio_addr(struct stm_data *stm_data, unsigned int master, 143 unsigned int channel, unsigned int nr_chans) 144 { 145 struct sth_device *sth = container_of(stm_data, struct sth_device, stm); 146 phys_addr_t addr; 147 148 master -= sth->stm.sw_start; 149 addr = sth->channels_phys + (master * sth->stm.sw_nchannels + channel) * 150 sizeof(struct intel_th_channel); 151 152 if (offset_in_page(addr) || 153 offset_in_page(nr_chans * sizeof(struct intel_th_channel))) 154 return 0; 155 156 return addr; 157 } 158 159 static int sth_stm_link(struct stm_data *stm_data, unsigned int master, 160 unsigned int channel) 161 { 162 struct sth_device *sth = container_of(stm_data, struct sth_device, stm); 163 164 return intel_th_set_output(to_intel_th_device(sth->dev), master); 165 } 166 167 static int intel_th_sw_init(struct sth_device *sth) 168 { 169 u32 reg; 170 171 reg = ioread32(sth->base + REG_STH_STHCAP1); 172 sth->stm.sw_nchannels = reg & 0xff; 173 174 reg = ioread32(sth->base + REG_STH_STHCAP0); 175 sth->stm.sw_start = reg & 0xffff; 176 sth->stm.sw_end = reg >> 16; 177 178 sth->sw_nmasters = sth->stm.sw_end - sth->stm.sw_start; 179 dev_dbg(sth->dev, "sw_start: %x sw_end: %x masters: %x nchannels: %x\n", 180 sth->stm.sw_start, sth->stm.sw_end, sth->sw_nmasters, 181 sth->stm.sw_nchannels); 182 183 return 0; 184 } 185 186 static int intel_th_sth_probe(struct intel_th_device *thdev) 187 { 188 struct device *dev = &thdev->dev; 189 struct sth_device *sth; 190 struct resource *res; 191 void __iomem *base, *channels; 192 int err; 193 194 res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0); 195 if (!res) 196 return -ENODEV; 197 198 base = devm_ioremap(dev, res->start, resource_size(res)); 199 if (!base) 200 return -ENOMEM; 201 202 res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 1); 203 if (!res) 204 return -ENODEV; 205 206 channels = devm_ioremap(dev, res->start, resource_size(res)); 207 if (!channels) 208 return -ENOMEM; 209 210 sth = devm_kzalloc(dev, sizeof(*sth), GFP_KERNEL); 211 if (!sth) 212 return -ENOMEM; 213 214 sth->dev = dev; 215 sth->base = base; 216 sth->channels = channels; 217 sth->channels_phys = res->start; 218 sth->stm.name = dev_name(dev); 219 sth->stm.packet = sth_stm_packet; 220 sth->stm.mmio_addr = sth_stm_mmio_addr; 221 sth->stm.sw_mmiosz = sizeof(struct intel_th_channel); 222 sth->stm.link = sth_stm_link; 223 224 err = intel_th_sw_init(sth); 225 if (err) 226 return err; 227 228 err = stm_register_device(dev, &sth->stm, THIS_MODULE); 229 if (err) { 230 dev_err(dev, "stm_register_device failed\n"); 231 return err; 232 } 233 234 dev_set_drvdata(dev, sth); 235 236 return 0; 237 } 238 239 static void intel_th_sth_remove(struct intel_th_device *thdev) 240 { 241 struct sth_device *sth = dev_get_drvdata(&thdev->dev); 242 243 stm_unregister_device(&sth->stm); 244 } 245 246 static struct intel_th_driver intel_th_sth_driver = { 247 .probe = intel_th_sth_probe, 248 .remove = intel_th_sth_remove, 249 .driver = { 250 .name = "sth", 251 .owner = THIS_MODULE, 252 }, 253 }; 254 255 module_driver(intel_th_sth_driver, 256 intel_th_driver_register, 257 intel_th_driver_unregister); 258 259 MODULE_LICENSE("GPL v2"); 260 MODULE_DESCRIPTION("Intel(R) Trace Hub Software Trace Hub driver"); 261 MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>"); 262