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Date: Fri, 25 Aug 2017 19:16:01 +0300
From: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To: Greg KH <greg@...ah.com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>,
Chunyan Zhang <zhang.chunyan@...aro.org>,
linux-kernel@...r.kernel.org,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [GIT PULL 10/15] intel_th: pti: Support Low Power Path output port type
The Low Power Path (LPP) output port type, looks mostly like PTI to
the software, with a few additional bits in the control register.
This extends the PTI driver to support LPP ports as well.
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
drivers/hwtracing/intel_th/pti.c | 115 +++++++++++++++++++++++++++++++++++++--
drivers/hwtracing/intel_th/pti.h | 8 +++
2 files changed, 118 insertions(+), 5 deletions(-)
diff --git a/drivers/hwtracing/intel_th/pti.c b/drivers/hwtracing/intel_th/pti.c
index 35738b5bfc..e96a1fcb57 100644
--- a/drivers/hwtracing/intel_th/pti.c
+++ b/drivers/hwtracing/intel_th/pti.c
@@ -1,7 +1,7 @@
/*
* Intel(R) Trace Hub PTI output driver
*
- * Copyright (C) 2014-2015 Intel Corporation.
+ * Copyright (C) 2014-2016 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -34,6 +34,8 @@ struct pti_device {
unsigned int freeclk;
unsigned int clkdiv;
unsigned int patgen;
+ unsigned int lpp_dest_mask;
+ unsigned int lpp_dest;
};
/* map PTI widths to MODE settings of PTI_CTL register */
@@ -163,6 +165,7 @@ static int intel_th_pti_activate(struct intel_th_device *thdev)
ctl |= PTI_FCEN;
ctl |= pti->mode << __ffs(PTI_MODE);
ctl |= pti->clkdiv << __ffs(PTI_CLKDIV);
+ ctl |= pti->lpp_dest << __ffs(LPP_DEST);
iowrite32(ctl, pti->base + REG_PTI_CTL);
@@ -192,6 +195,15 @@ static void read_hw_config(struct pti_device *pti)
pti->mode = pti_width_mode(4);
if (!pti->clkdiv)
pti->clkdiv = 1;
+
+ if (pti->thdev->output.type == GTH_LPP) {
+ if (ctl & LPP_PTIPRESENT)
+ pti->lpp_dest_mask |= LPP_DEST_PTI;
+ if (ctl & LPP_BSSBPRESENT)
+ pti->lpp_dest_mask |= LPP_DEST_EXI;
+ if (ctl & LPP_DEST)
+ pti->lpp_dest = 1;
+ }
}
static int intel_th_pti_probe(struct intel_th_device *thdev)
@@ -239,10 +251,103 @@ static struct intel_th_driver intel_th_pti_driver = {
},
};
-module_driver(intel_th_pti_driver,
- intel_th_driver_register,
- intel_th_driver_unregister);
+static const char * const lpp_dest_str[] = { "pti", "exi" };
+
+static ssize_t lpp_dest_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct pti_device *pti = dev_get_drvdata(dev);
+ ssize_t ret = 0;
+ int i;
+
+ for (i = ARRAY_SIZE(lpp_dest_str) - 1; i >= 0; i--) {
+ const char *fmt = pti->lpp_dest == i ? "[%s] " : "%s ";
+
+ if (!(pti->lpp_dest_mask & BIT(i)))
+ continue;
+
+ ret += scnprintf(buf + ret, PAGE_SIZE - ret,
+ fmt, lpp_dest_str[i]);
+ }
+
+ if (ret)
+ buf[ret - 1] = '\n';
+
+ return ret;
+}
+
+static ssize_t lpp_dest_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct pti_device *pti = dev_get_drvdata(dev);
+ ssize_t ret = -EINVAL;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(lpp_dest_str); i++)
+ if (sysfs_streq(buf, lpp_dest_str[i]))
+ break;
+
+ if (i < ARRAY_SIZE(lpp_dest_str) && pti->lpp_dest_mask & BIT(i)) {
+ pti->lpp_dest = i;
+ ret = size;
+ }
+
+ return ret;
+}
+
+static DEVICE_ATTR_RW(lpp_dest);
+
+static struct attribute *lpp_output_attrs[] = {
+ &dev_attr_mode.attr,
+ &dev_attr_freerunning_clock.attr,
+ &dev_attr_clock_divider.attr,
+ &dev_attr_lpp_dest.attr,
+ NULL,
+};
+
+static struct attribute_group lpp_output_group = {
+ .attrs = lpp_output_attrs,
+};
+
+static struct intel_th_driver intel_th_lpp_driver = {
+ .probe = intel_th_pti_probe,
+ .remove = intel_th_pti_remove,
+ .activate = intel_th_pti_activate,
+ .deactivate = intel_th_pti_deactivate,
+ .attr_group = &lpp_output_group,
+ .driver = {
+ .name = "lpp",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init intel_th_pti_lpp_init(void)
+{
+ int err;
+
+ err = intel_th_driver_register(&intel_th_pti_driver);
+ if (err)
+ return err;
+
+ err = intel_th_driver_register(&intel_th_lpp_driver);
+ if (err) {
+ intel_th_driver_unregister(&intel_th_pti_driver);
+ return err;
+ }
+
+ return 0;
+}
+
+module_init(intel_th_pti_lpp_init);
+
+static void __exit intel_th_pti_lpp_exit(void)
+{
+ intel_th_driver_unregister(&intel_th_pti_driver);
+ intel_th_driver_unregister(&intel_th_lpp_driver);
+}
+
+module_exit(intel_th_pti_lpp_exit);
MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("Intel(R) Trace Hub PTI output driver");
+MODULE_DESCRIPTION("Intel(R) Trace Hub PTI/LPP output driver");
MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@...ux.intel.com>");
diff --git a/drivers/hwtracing/intel_th/pti.h b/drivers/hwtracing/intel_th/pti.h
index 20883f5628..30827be67b 100644
--- a/drivers/hwtracing/intel_th/pti.h
+++ b/drivers/hwtracing/intel_th/pti.h
@@ -23,7 +23,15 @@ enum {
#define PTI_EN BIT(0)
#define PTI_FCEN BIT(1)
#define PTI_MODE 0xf0
+#define LPP_PTIPRESENT BIT(8)
+#define LPP_BSSBPRESENT BIT(9)
#define PTI_CLKDIV 0x000f0000
#define PTI_PATGENMODE 0x00f00000
+#define LPP_DEST BIT(25)
+#define LPP_BSSBACT BIT(30)
+#define LPP_LPPBUSY BIT(31)
+
+#define LPP_DEST_PTI BIT(0)
+#define LPP_DEST_EXI BIT(1)
#endif /* __INTEL_TH_STH_H__ */
--
2.14.1
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