[RFC 10/24] drm/lima: add PMU related functions

[Qiang Yu <yuq825@gmail.com>]

From: Lima Project Developers <dri-devel@lists.freedesktop.org>

Signed-off-by: Qiang Yu <yuq825@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
---
 drivers/gpu/drm/lima/lima_pmu.c | 85 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/lima/lima_pmu.h | 30 ++++++++++++
 2 files changed, 115 insertions(+)
 create mode 100644 drivers/gpu/drm/lima/lima_pmu.c
 create mode 100644 drivers/gpu/drm/lima/lima_pmu.h

diff --git a/drivers/gpu/drm/lima/lima_pmu.c b/drivers/gpu/drm/lima/lima_pmu.c
new file mode 100644
index 000000000000..255a64e9f265
--- /dev/null
+++ b/drivers/gpu/drm/lima/lima_pmu.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2017-2018 Lima Project
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/of.h>
+#include <linux/io.h>
+#include <linux/device.h>
+
+#include "lima_device.h"
+#include "lima_pmu.h"
+#include "lima_regs.h"
+
+#define pmu_write(reg, data) writel(data, ip->iomem + LIMA_PMU_##reg)
+#define pmu_read(reg) readl(ip->iomem + LIMA_PMU_##reg)
+
+static int lima_pmu_wait_cmd(struct lima_ip *ip)
+{
+	struct lima_device *dev = ip->dev;
+	u32 stat, timeout;
+
+	for (timeout = 1000000; timeout > 0; timeout--) {
+		stat = pmu_read(INT_RAWSTAT);
+		if (stat & LIMA_PMU_INT_CMD_MASK)
+			break;
+	}
+
+	if (!timeout) {
+		dev_err(dev->dev, "timeout wait pmd cmd\n");
+		return -ETIMEDOUT;
+	}
+
+	pmu_write(INT_CLEAR, LIMA_PMU_INT_CMD_MASK);
+	return 0;
+}
+
+int lima_pmu_init(struct lima_ip *ip)
+{
+	int err;
+	u32 stat;
+	struct lima_device *dev = ip->dev;
+	struct device_node *np = dev->dev->of_node;
+
+	/* If this value is too low, when in high GPU clk freq,
+	 * GPU will be in unstable state. */
+	if (of_property_read_u32(np, "switch-delay", &ip->data.switch_delay))
+		ip->data.switch_delay = 0xff;
+
+	pmu_write(INT_MASK, 0);
+	pmu_write(SW_DELAY, ip->data.switch_delay);
+
+	/* status reg 1=off 0=on */
+	stat = pmu_read(STATUS);
+
+	/* power up all ip */
+	if (stat) {
+		pmu_write(POWER_UP, stat);
+		err = lima_pmu_wait_cmd(ip);
+		if (err)
+			return err;
+	}
+	return 0;
+}
+
+void lima_pmu_fini(struct lima_ip *ip)
+{
+
+}
diff --git a/drivers/gpu/drm/lima/lima_pmu.h b/drivers/gpu/drm/lima/lima_pmu.h
new file mode 100644
index 000000000000..fb68a7059a37
--- /dev/null
+++ b/drivers/gpu/drm/lima/lima_pmu.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2017-2018 Lima Project
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef __LIMA_PMU_H__
+#define __LIMA_PMU_H__
+
+struct lima_ip;
+
+int lima_pmu_init(struct lima_ip *ip);
+void lima_pmu_fini(struct lima_ip *ip);
+
+#endif
-- 
2.17.0

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