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 case STP_PACKET_XSYNC: 88 reg += 8; 89 case STP_PACKET_TRIG: 90 if (flags & STP_PACKET_TIMESTAMPED) 91 reg += 4; 92 writeb_relaxed(*payload, sth->base + reg); 93 break; 94 95 case STP_PACKET_MERR: 96 if (size > 4) 97 size = 4; 98 99 sth_iowrite(&out->MERR, payload, size); 100 break; 101 102 case STP_PACKET_FLAG: 103 if (flags & STP_PACKET_TIMESTAMPED) 104 outp = (u64 __iomem *)&out->FLAG_TS; 105 else 106 outp = (u64 __iomem *)&out->FLAG; 107 108 size = 0; 109 writeb_relaxed(0, outp); 110 break; 111 112 case STP_PACKET_USER: 113 if (flags & STP_PACKET_TIMESTAMPED) 114 outp = &out->USER_TS; 115 else 116 outp = &out->USER; 117 sth_iowrite(outp, payload, size); 118 break; 119 120 case STP_PACKET_DATA: 121 outp = &out->Dn; 122 123 if (flags & STP_PACKET_TIMESTAMPED) 124 outp += 2; 125 if (flags & STP_PACKET_MARKED) 126 outp++; 127 128 sth_iowrite(outp, payload, size); 129 break; 130 default: 131 return -ENOTSUPP; 132 } 133 134 return size; 135 } 136 137 static phys_addr_t 138 sth_stm_mmio_addr(struct stm_data *stm_data, unsigned int master, 139 unsigned int channel, unsigned int nr_chans) 140 { 141 struct sth_device *sth = container_of(stm_data, struct sth_device, stm); 142 phys_addr_t addr; 143 144 master -= sth->stm.sw_start; 145 addr = sth->channels_phys + (master * sth->stm.sw_nchannels + channel) * 146 sizeof(struct intel_th_channel); 147 148 if (offset_in_page(addr) || 149 offset_in_page(nr_chans * sizeof(struct intel_th_channel))) 150 return 0; 151 152 return addr; 153 } 154 155 static int sth_stm_link(struct stm_data *stm_data, unsigned int master, 156 unsigned int channel) 157 { 158 struct sth_device *sth = container_of(stm_data, struct sth_device, stm); 159 160 intel_th_set_output(to_intel_th_device(sth->dev), master); 161 162 return 0; 163 } 164 165 static int intel_th_sw_init(struct sth_device *sth) 166 { 167 u32 reg; 168 169 reg = ioread32(sth->base + REG_STH_STHCAP1); 170 sth->stm.sw_nchannels = reg & 0xff; 171 172 reg = ioread32(sth->base + REG_STH_STHCAP0); 173 sth->stm.sw_start = reg & 0xffff; 174 sth->stm.sw_end = reg >> 16; 175 176 sth->sw_nmasters = sth->stm.sw_end - sth->stm.sw_start; 177 dev_dbg(sth->dev, "sw_start: %x sw_end: %x masters: %x nchannels: %x\n", 178 sth->stm.sw_start, sth->stm.sw_end, sth->sw_nmasters, 179 sth->stm.sw_nchannels); 180 181 return 0; 182 } 183 184 static int intel_th_sth_probe(struct intel_th_device *thdev) 185 { 186 struct device *dev = &thdev->dev; 187 struct sth_device *sth; 188 struct resource *res; 189 void __iomem *base, *channels; 190 int err; 191 192 res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0); 193 if (!res) 194 return -ENODEV; 195 196 base = devm_ioremap(dev, res->start, resource_size(res)); 197 if (!base) 198 return -ENOMEM; 199 200 res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 1); 201 if (!res) 202 return -ENODEV; 203 204 channels = devm_ioremap(dev, res->start, resource_size(res)); 205 if (!channels) 206 return -ENOMEM; 207 208 sth = devm_kzalloc(dev, sizeof(*sth), GFP_KERNEL); 209 if (!sth) 210 return -ENOMEM; 211 212 sth->dev = dev; 213 sth->base = base; 214 sth->channels = channels; 215 sth->channels_phys = res->start; 216 sth->stm.name = dev_name(dev); 217 sth->stm.packet = sth_stm_packet; 218 sth->stm.mmio_addr = sth_stm_mmio_addr; 219 sth->stm.sw_mmiosz = sizeof(struct intel_th_channel); 220 sth->stm.link = sth_stm_link; 221 222 err = intel_th_sw_init(sth); 223 if (err) 224 return err; 225 226 err = stm_register_device(dev, &sth->stm, THIS_MODULE); 227 if (err) { 228 dev_err(dev, "stm_register_device failed\n"); 229 return err; 230 } 231 232 dev_set_drvdata(dev, sth); 233 234 return 0; 235 } 236 237 static void intel_th_sth_remove(struct intel_th_device *thdev) 238 { 239 struct sth_device *sth = dev_get_drvdata(&thdev->dev); 240 241 stm_unregister_device(&sth->stm); 242 } 243 244 static struct intel_th_driver intel_th_sth_driver = { 245 .probe = intel_th_sth_probe, 246 .remove = intel_th_sth_remove, 247 .driver = { 248 .name = "sth", 249 .owner = THIS_MODULE, 250 }, 251 }; 252 253 module_driver(intel_th_sth_driver, 254 intel_th_driver_register, 255 intel_th_driver_unregister); 256 257 MODULE_LICENSE("GPL v2"); 258 MODULE_DESCRIPTION("Intel(R) Trace Hub Software Trace Hub driver"); 259 MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>"); 260