habanalabs: add hwmgr module for gaudi

The hwmgr module is responsible for messages sent to GAUDI F/W that are
not common to all habanalabs ASICs.

In GAUDI, we provide the user a simplified mode of controlling the ASIC
clock frequency. Instead of three different clocks, we present a single
clock property that the user can configure via sysfs.

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

1 files changed, 121 insertions, 0 deletions

diff --git a/drivers/misc/habanalabs/gaudi/gaudi_hwmgr.c b/drivers/misc/habanalabs/gaudi/gaudi_hwmgr.c
new file mode 100644
index 000000000000..6dd2c2a1cd70
--- /dev/null
+++ b/drivers/misc/habanalabs/gaudi/gaudi_hwmgr.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2016-2018 HabanaLabs, Ltd.
+ * All Rights Reserved.
+ */
+
+#include "gaudiP.h"
+#include "include/gaudi/gaudi_fw_if.h"
+
+void gaudi_set_pll_profile(struct hl_device *hdev, enum hl_pll_frequency freq)
+{
+	struct gaudi_device *gaudi = hdev->asic_specific;
+
+	if (freq == PLL_LAST)
+		hl_set_frequency(hdev, MME_PLL, gaudi->max_freq_value);
+}
+
+int gaudi_get_clk_rate(struct hl_device *hdev, u32 *cur_clk, u32 *max_clk)
+{
+	long value;
+
+	if (hl_device_disabled_or_in_reset(hdev))
+		return -ENODEV;
+
+	value = hl_get_frequency(hdev, MME_PLL, false);
+
+	if (value < 0) {
+		dev_err(hdev->dev, "Failed to retrieve device max clock %ld\n",
+			value);
+		return value;
+	}
+
+	*max_clk = (value / 1000 / 1000);
+
+	value = hl_get_frequency(hdev, MME_PLL, true);
+
+	if (value < 0) {
+		dev_err(hdev->dev,
+			"Failed to retrieve device current clock %ld\n",
+			value);
+		return value;
+	}
+
+	*cur_clk = (value / 1000 / 1000);
+
+	return 0;
+}
+
+static ssize_t clk_max_freq_mhz_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct hl_device *hdev = dev_get_drvdata(dev);
+	struct gaudi_device *gaudi = hdev->asic_specific;
+	long value;
+
+	if (hl_device_disabled_or_in_reset(hdev))
+		return -ENODEV;
+
+	value = hl_get_frequency(hdev, MME_PLL, false);
+
+	gaudi->max_freq_value = value;
+
+	return sprintf(buf, "%lu\n", (value / 1000 / 1000));
+}
+
+static ssize_t clk_max_freq_mhz_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct hl_device *hdev = dev_get_drvdata(dev);
+	struct gaudi_device *gaudi = hdev->asic_specific;
+	int rc;
+	u64 value;
+
+	if (hl_device_disabled_or_in_reset(hdev)) {
+		count = -ENODEV;
+		goto fail;
+	}
+
+	rc = kstrtoull(buf, 0, &value);
+	if (rc) {
+		count = -EINVAL;
+		goto fail;
+	}
+
+	gaudi->max_freq_value = value * 1000 * 1000;
+
+	hl_set_frequency(hdev, MME_PLL, gaudi->max_freq_value);
+
+fail:
+	return count;
+}
+
+static ssize_t clk_cur_freq_mhz_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct hl_device *hdev = dev_get_drvdata(dev);
+	long value;
+
+	if (hl_device_disabled_or_in_reset(hdev))
+		return -ENODEV;
+
+	value = hl_get_frequency(hdev, MME_PLL, true);
+
+	return sprintf(buf, "%lu\n", (value / 1000 / 1000));
+}
+
+static DEVICE_ATTR_RW(clk_max_freq_mhz);
+static DEVICE_ATTR_RO(clk_cur_freq_mhz);
+
+static struct attribute *gaudi_dev_attrs[] = {
+	&dev_attr_clk_max_freq_mhz.attr,
+	&dev_attr_clk_cur_freq_mhz.attr,
+	NULL,
+};
+
+void gaudi_add_device_attr(struct hl_device *hdev,
+			struct attribute_group *dev_attr_grp)
+{
+	dev_attr_grp->attrs = gaudi_dev_attrs;
+}