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280 lines
8.1 KiB
Diff
280 lines
8.1 KiB
Diff
From 8d7247813f02cad15a67980c2631d9ee37d7b76b Mon Sep 17 00:00:00 2001
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From: Maxime Jourdan <maxi.jourdan@wanadoo.fr>
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Date: Wed, 1 Aug 2018 20:51:25 +0200
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Subject: [PATCH] soc: amlogic: add meson-canvas driver
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Amlogic SoCs have a repository of 256 canvas which they use to
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describe pixel buffers.
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They contain metadata like width, height, block mode, endianness [..]
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Many IPs within those SoCs like vdec/vpu rely on those canvas to read/write
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pixels.
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Signed-off-by: Maxime Jourdan <maxi.jourdan@wanadoo.fr>
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---
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drivers/soc/amlogic/Kconfig | 7 ++
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drivers/soc/amlogic/Makefile | 1 +
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drivers/soc/amlogic/meson-canvas.c | 182 +++++++++++++++++++++++++++++++
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include/linux/soc/amlogic/meson-canvas.h | 37 +++++++
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4 files changed, 227 insertions(+)
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create mode 100644 drivers/soc/amlogic/meson-canvas.c
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create mode 100644 include/linux/soc/amlogic/meson-canvas.h
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diff --git a/drivers/soc/amlogic/Kconfig b/drivers/soc/amlogic/Kconfig
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index b04f6e4..5bd0498 100644
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--- a/drivers/soc/amlogic/Kconfig
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+++ b/drivers/soc/amlogic/Kconfig
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@@ -1,5 +1,12 @@
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menu "Amlogic SoC drivers"
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+config MESON_CANVAS
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+ bool "Amlogic Meson Canvas driver"
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+ depends on ARCH_MESON || COMPILE_TEST
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+ default ARCH_MESON
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+ help
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+ Say yes to support the canvas IP within Amlogic Meson Soc family.
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+
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config MESON_GX_SOCINFO
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bool "Amlogic Meson GX SoC Information driver"
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depends on ARCH_MESON || COMPILE_TEST
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diff --git a/drivers/soc/amlogic/Makefile b/drivers/soc/amlogic/Makefile
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index 8fa3218..0ab16d3 100644
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--- a/drivers/soc/amlogic/Makefile
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+++ b/drivers/soc/amlogic/Makefile
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@@ -1,3 +1,4 @@
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+obj-$(CONFIG_MESON_CANVAS) += meson-canvas.o
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obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o
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obj-$(CONFIG_MESON_GX_PM_DOMAINS) += meson-gx-pwrc-vpu.o
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obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o
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diff --git a/drivers/soc/amlogic/meson-canvas.c b/drivers/soc/amlogic/meson-canvas.c
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new file mode 100644
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index 0000000..671eb89
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--- /dev/null
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+++ b/drivers/soc/amlogic/meson-canvas.c
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@@ -0,0 +1,182 @@
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+/*
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+ * Copyright (C) 2018 Maxime Jourdan
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+ * Copyright (C) 2016 BayLibre, SAS
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+ * Author: Neil Armstrong <narmstrong@baylibre.com>
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+ * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
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+ * Copyright (C) 2014 Endless Mobile
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation; either version 2 of the
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+ * License, or (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include <linux/of_address.h>
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+#include <linux/platform_device.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/regmap.h>
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+#include <linux/mfd/syscon.h>
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+#include <linux/soc/amlogic/meson-canvas.h>
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+#include <asm/io.h>
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+
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+#define NUM_CANVAS 256
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+
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+/* DMC Registers */
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+#define DMC_CAV_LUT_DATAL 0x48 /* 0x12 offset in data sheet */
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+ #define CANVAS_WIDTH_LBIT 29
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+ #define CANVAS_WIDTH_LWID 3
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+#define DMC_CAV_LUT_DATAH 0x4c /* 0x13 offset in data sheet */
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+ #define CANVAS_WIDTH_HBIT 0
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+ #define CANVAS_HEIGHT_BIT 9
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+ #define CANVAS_BLKMODE_BIT 24
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+#define DMC_CAV_LUT_ADDR 0x50 /* 0x14 offset in data sheet */
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+ #define CANVAS_LUT_WR_EN (0x2 << 8)
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+ #define CANVAS_LUT_RD_EN (0x1 << 8)
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+
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+struct meson_canvas {
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+ struct device *dev;
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+ struct regmap *regmap_dmc;
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+ struct mutex lock;
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+ u8 used[NUM_CANVAS];
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+};
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+
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+static struct meson_canvas canvas = { 0 };
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+
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+static int meson_canvas_setup(uint8_t canvas_index, uint32_t addr,
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+ uint32_t stride, uint32_t height,
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+ unsigned int wrap,
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+ unsigned int blkmode,
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+ unsigned int endian)
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+{
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+ struct regmap *regmap = canvas.regmap_dmc;
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+ u32 val;
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+
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+ mutex_lock(&canvas.lock);
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+
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+ if (!canvas.used[canvas_index]) {
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+ dev_err(canvas.dev,
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+ "Trying to setup non allocated canvas %u\n",
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+ canvas_index);
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+ mutex_unlock(&canvas.lock);
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+ return -EINVAL;
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+ }
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+
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+ regmap_write(regmap, DMC_CAV_LUT_DATAL,
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+ ((addr + 7) >> 3) |
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+ (((stride + 7) >> 3) << CANVAS_WIDTH_LBIT));
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+
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+ regmap_write(regmap, DMC_CAV_LUT_DATAH,
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+ ((((stride + 7) >> 3) >> CANVAS_WIDTH_LWID) <<
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+ CANVAS_WIDTH_HBIT) |
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+ (height << CANVAS_HEIGHT_BIT) |
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+ (wrap << 22) |
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+ (blkmode << CANVAS_BLKMODE_BIT) |
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+ (endian << 26));
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+
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+ regmap_write(regmap, DMC_CAV_LUT_ADDR,
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+ CANVAS_LUT_WR_EN | canvas_index);
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+
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+ /* Force a read-back to make sure everything is flushed. */
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+ regmap_read(regmap, DMC_CAV_LUT_DATAH, &val);
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+ mutex_unlock(&canvas.lock);
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+
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+ return 0;
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+}
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+
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+static int meson_canvas_alloc(uint8_t *canvas_index)
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+{
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+ int i;
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+
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+ mutex_lock(&canvas.lock);
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+ for (i = 0; i < NUM_CANVAS; ++i) {
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+ if (!canvas.used[i]) {
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+ canvas.used[i] = 1;
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+ mutex_unlock(&canvas.lock);
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+ *canvas_index = i;
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+ return 0;
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+ }
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+ }
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+ mutex_unlock(&canvas.lock);
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+ dev_err(canvas.dev, "No more canvas available\n");
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+
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+ return -ENODEV;
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+}
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+
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+static int meson_canvas_free(uint8_t canvas_index)
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+{
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+ mutex_lock(&canvas.lock);
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+ if (!canvas.used[canvas_index]) {
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+ dev_err(canvas.dev,
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+ "Trying to free unused canvas %u\n", canvas_index);
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+ mutex_unlock(&canvas.lock);
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+ return -EINVAL;
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+ }
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+ canvas.used[canvas_index] = 0;
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+ mutex_unlock(&canvas.lock);
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+
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+ return 0;
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+}
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+
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+static struct meson_canvas_platform_data canvas_platform_data = {
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+ .alloc = meson_canvas_alloc,
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+ .free = meson_canvas_free,
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+ .setup = meson_canvas_setup,
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+};
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+
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+static int meson_canvas_probe(struct platform_device *pdev)
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+{
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+ struct regmap *regmap_dmc;
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+ struct device *dev;
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+
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+ dev = &pdev->dev;
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+
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+ regmap_dmc = syscon_node_to_regmap(of_get_parent(dev->of_node));
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+ if (IS_ERR(regmap_dmc)) {
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+ dev_err(&pdev->dev, "failed to get DMC regmap\n");
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+ return PTR_ERR(regmap_dmc);
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+ }
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+
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+ canvas.dev = dev;
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+ canvas.regmap_dmc = regmap_dmc;
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+ mutex_init(&canvas.lock);
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+
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+ dev->platform_data = &canvas_platform_data;
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+
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+ return 0;
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+}
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+
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+static int meson_canvas_remove(struct platform_device *pdev)
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+{
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+ mutex_destroy(&canvas.lock);
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+ return 0;
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+}
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+
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+static const struct of_device_id canvas_dt_match[] = {
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+ { .compatible = "amlogic,meson-canvas" },
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+ {}
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+};
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+MODULE_DEVICE_TABLE(of, canvas_dt_match);
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+
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+static struct platform_driver meson_canvas_driver = {
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+ .probe = meson_canvas_probe,
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+ .remove = meson_canvas_remove,
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+ .driver = {
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+ .name = "meson-canvas",
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+ .of_match_table = canvas_dt_match,
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+ },
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+};
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+module_platform_driver(meson_canvas_driver);
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+
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+MODULE_ALIAS("platform:meson-canvas");
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+MODULE_DESCRIPTION("AMLogic Meson Canvas driver");
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+MODULE_AUTHOR("Maxime Jourdan <maxi.jourdan@wanadoo.fr>");
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+MODULE_LICENSE("GPL v2");
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diff --git a/include/linux/soc/amlogic/meson-canvas.h b/include/linux/soc/amlogic/meson-canvas.h
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new file mode 100644
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index 0000000..af9e241
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--- /dev/null
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+++ b/include/linux/soc/amlogic/meson-canvas.h
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@@ -0,0 +1,37 @@
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+/*
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+ * Copyright (c) 2018 Maxime Jourdan
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+ * Author: Maxime Jourdan <maxi.jourdan@wanadoo.fr>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+#ifndef MESON_CANVAS_H
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+#define MESON_CANVAS_H
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+
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+#include <linux/kernel.h>
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+
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+#define MESON_CANVAS_WRAP_NONE 0x00
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+#define MESON_CANVAS_WRAP_X 0x01
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+#define MESON_CANVAS_WRAP_Y 0x02
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+
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+#define MESON_CANVAS_BLKMODE_LINEAR 0x00
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+#define MESON_CANVAS_BLKMODE_32x32 0x01
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+#define MESON_CANVAS_BLKMODE_64x64 0x02
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+
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+struct meson_canvas_platform_data {
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+ int (*alloc)(uint8_t *canvas_index);
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+ int (*free) (uint8_t canvas_index);
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+ int (*setup)(uint8_t canvas_index, uint32_t addr,
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+ uint32_t stride, uint32_t height,
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+ unsigned int wrap,
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+ unsigned int blkmode,
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+ unsigned int endian);
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+};
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+
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+#endif
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