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 *
sth_channel(struct sth_device * sth,unsigned int master,unsigned int channel)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
sth_iowrite(void __iomem * dest,const unsigned char * payload,unsigned int size)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
sth_stm_packet(struct stm_data * stm_data,unsigned int master,unsigned int channel,unsigned int packet,unsigned int flags,unsigned int size,const unsigned char * payload)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
sth_stm_mmio_addr(struct stm_data * stm_data,unsigned int master,unsigned int channel,unsigned int nr_chans)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
sth_stm_link(struct stm_data * stm_data,unsigned int master,unsigned int channel)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
intel_th_sw_init(struct sth_device * sth)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
intel_th_sth_probe(struct intel_th_device * thdev)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
intel_th_sth_remove(struct intel_th_device * thdev)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