treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / hwtracing / intel_th / sth.c
blob3a1f4e65037841eb8a878c3f1fc4177483566c52
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Intel(R) Trace Hub Software Trace Hub support
5 * Copyright (C) 2014-2015 Intel Corporation.
6 */
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
18 #include "intel_th.h"
19 #include "sth.h"
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;
30 static struct intel_th_channel __iomem *
31 sth_channel(struct sth_device *sth, unsigned int master, unsigned int channel)
33 struct intel_th_channel __iomem *sw_map = sth->channels;
35 return &sw_map[(master - sth->stm.sw_start) * sth->stm.sw_nchannels +
36 channel];
39 static void sth_iowrite(void __iomem *dest, const unsigned char *payload,
40 unsigned int size)
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;
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)
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;
76 #ifndef CONFIG_64BIT
77 if (size > 4)
78 size = 4;
79 #endif
81 size = rounddown_pow_of_two(size);
83 switch (packet) {
84 /* Global packets (GERR, XSYNC, TRIG) are sent with register writes */
85 case STP_PACKET_GERR:
86 reg += 4;
87 /* fall through */
89 case STP_PACKET_XSYNC:
90 reg += 8;
91 /* fall through */
93 case STP_PACKET_TRIG:
94 if (flags & STP_PACKET_TIMESTAMPED)
95 reg += 4;
96 writeb_relaxed(*payload, sth->base + reg);
97 break;
99 case STP_PACKET_MERR:
100 if (size > 4)
101 size = 4;
103 sth_iowrite(&out->MERR, payload, size);
104 break;
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;
112 size = 0;
113 writeb_relaxed(0, outp);
114 break;
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;
124 case STP_PACKET_DATA:
125 outp = &out->Dn;
127 if (flags & STP_PACKET_TIMESTAMPED)
128 outp += 2;
129 if (flags & STP_PACKET_MARKED)
130 outp++;
132 sth_iowrite(outp, payload, size);
133 break;
134 default:
135 return -ENOTSUPP;
138 return size;
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)
145 struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
146 phys_addr_t addr;
148 master -= sth->stm.sw_start;
149 addr = sth->channels_phys + (master * sth->stm.sw_nchannels + channel) *
150 sizeof(struct intel_th_channel);
152 if (offset_in_page(addr) ||
153 offset_in_page(nr_chans * sizeof(struct intel_th_channel)))
154 return 0;
156 return addr;
159 static int sth_stm_link(struct stm_data *stm_data, unsigned int master,
160 unsigned int channel)
162 struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
164 intel_th_set_output(to_intel_th_device(sth->dev), master);
166 return 0;
169 static int intel_th_sw_init(struct sth_device *sth)
171 u32 reg;
173 reg = ioread32(sth->base + REG_STH_STHCAP1);
174 sth->stm.sw_nchannels = reg & 0xff;
176 reg = ioread32(sth->base + REG_STH_STHCAP0);
177 sth->stm.sw_start = reg & 0xffff;
178 sth->stm.sw_end = reg >> 16;
180 sth->sw_nmasters = sth->stm.sw_end - sth->stm.sw_start;
181 dev_dbg(sth->dev, "sw_start: %x sw_end: %x masters: %x nchannels: %x\n",
182 sth->stm.sw_start, sth->stm.sw_end, sth->sw_nmasters,
183 sth->stm.sw_nchannels);
185 return 0;
188 static int intel_th_sth_probe(struct intel_th_device *thdev)
190 struct device *dev = &thdev->dev;
191 struct sth_device *sth;
192 struct resource *res;
193 void __iomem *base, *channels;
194 int err;
196 res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0);
197 if (!res)
198 return -ENODEV;
200 base = devm_ioremap(dev, res->start, resource_size(res));
201 if (!base)
202 return -ENOMEM;
204 res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 1);
205 if (!res)
206 return -ENODEV;
208 channels = devm_ioremap(dev, res->start, resource_size(res));
209 if (!channels)
210 return -ENOMEM;
212 sth = devm_kzalloc(dev, sizeof(*sth), GFP_KERNEL);
213 if (!sth)
214 return -ENOMEM;
216 sth->dev = dev;
217 sth->base = base;
218 sth->channels = channels;
219 sth->channels_phys = res->start;
220 sth->stm.name = dev_name(dev);
221 sth->stm.packet = sth_stm_packet;
222 sth->stm.mmio_addr = sth_stm_mmio_addr;
223 sth->stm.sw_mmiosz = sizeof(struct intel_th_channel);
224 sth->stm.link = sth_stm_link;
226 err = intel_th_sw_init(sth);
227 if (err)
228 return err;
230 err = stm_register_device(dev, &sth->stm, THIS_MODULE);
231 if (err) {
232 dev_err(dev, "stm_register_device failed\n");
233 return err;
236 dev_set_drvdata(dev, sth);
238 return 0;
241 static void intel_th_sth_remove(struct intel_th_device *thdev)
243 struct sth_device *sth = dev_get_drvdata(&thdev->dev);
245 stm_unregister_device(&sth->stm);
248 static struct intel_th_driver intel_th_sth_driver = {
249 .probe = intel_th_sth_probe,
250 .remove = intel_th_sth_remove,
251 .driver = {
252 .name = "sth",
253 .owner = THIS_MODULE,
257 module_driver(intel_th_sth_driver,
258 intel_th_driver_register,
259 intel_th_driver_unregister);
261 MODULE_LICENSE("GPL v2");
262 MODULE_DESCRIPTION("Intel(R) Trace Hub Software Trace Hub driver");
263 MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>");