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113 lines
3.5 KiB
113 lines
3.5 KiB
From b0a88a861b036124ef2d6acfe6dd87cfde63e750 Mon Sep 17 00:00:00 2001
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From: Linus Walleij <linus.walleij@linaro.org>
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Date: Fri, 22 Dec 2017 00:19:08 +0100
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Subject: [PATCH 20/31] soc: Add SoC driver for Gemini
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This adds an SoC driver for the Gemini. Currently there
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is only one thing not fitting into any other framework,
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and that is the bus arbitration setting.
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All Gemini vendor trees seem to be setting this register to
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exactly the same arbitration so we just add a small code
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snippet to do this at subsys_init() time before any other
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drivers kick in.
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Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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---
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drivers/soc/Makefile | 1 +
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drivers/soc/gemini/Makefile | 2 ++
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drivers/soc/gemini/soc-gemini.c | 71 +++++++++++++++++++++++++++++++++++++++++
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3 files changed, 74 insertions(+)
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create mode 100644 drivers/soc/gemini/Makefile
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create mode 100644 drivers/soc/gemini/soc-gemini.c
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--- a/drivers/soc/Makefile
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+++ b/drivers/soc/Makefile
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@@ -9,6 +9,7 @@ obj-y += bcm/
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obj-$(CONFIG_ARCH_DOVE) += dove/
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obj-$(CONFIG_MACH_DOVE) += dove/
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obj-y += fsl/
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+obj-$(CONFIG_ARCH_GEMINI) += gemini/
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obj-$(CONFIG_ARCH_MXC) += imx/
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obj-$(CONFIG_SOC_XWAY) += lantiq/
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obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/
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--- /dev/null
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+++ b/drivers/soc/gemini/Makefile
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@@ -0,0 +1,2 @@
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+# SPDX-License-Identifier: GPL-2.0
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+obj-y += soc-gemini.o
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--- /dev/null
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+++ b/drivers/soc/gemini/soc-gemini.c
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@@ -0,0 +1,71 @@
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+// SPDX-License-Identifier: GPL-2.0
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+/*
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+ * Copyright (C) 2017 Linaro Ltd.
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+ *
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+ * Author: Linus Walleij <linus.walleij@linaro.org>
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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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+ */
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+#include <linux/init.h>
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+#include <linux/kernel.h>
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+#include <linux/mfd/syscon.h>
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+#include <linux/regmap.h>
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+#include <linux/of.h>
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+
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+#define GLOBAL_WORD_ID 0x00
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+#define GEMINI_GLOBAL_ARB1_CTRL 0x2c
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+#define GEMINI_ARB1_BURST_MASK GENMASK(21, 16)
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+#define GEMINI_ARB1_BURST_SHIFT 16
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+/* These all define the priority on the BUS2 backplane */
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+#define GEMINI_ARB1_PRIO_MASK GENMASK(9, 0)
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+#define GEMINI_ARB1_DMAC_HIGH_PRIO BIT(0)
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+#define GEMINI_ARB1_IDE_HIGH_PRIO BIT(1)
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+#define GEMINI_ARB1_RAID_HIGH_PRIO BIT(2)
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+#define GEMINI_ARB1_SECURITY_HIGH_PRIO BIT(3)
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+#define GEMINI_ARB1_GMAC0_HIGH_PRIO BIT(4)
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+#define GEMINI_ARB1_GMAC1_HIGH_PRIO BIT(5)
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+#define GEMINI_ARB1_USB0_HIGH_PRIO BIT(6)
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+#define GEMINI_ARB1_USB1_HIGH_PRIO BIT(7)
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+#define GEMINI_ARB1_PCI_HIGH_PRIO BIT(8)
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+#define GEMINI_ARB1_TVE_HIGH_PRIO BIT(9)
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+
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+#define GEMINI_DEFAULT_BURST_SIZE 0x20
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+#define GEMINI_DEFAULT_PRIO (GEMINI_ARB1_GMAC0_HIGH_PRIO | \
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+ GEMINI_ARB1_GMAC1_HIGH_PRIO)
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+
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+static int __init gemini_soc_init(void)
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+{
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+ struct regmap *map;
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+ u32 rev;
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+ u32 val;
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+ int ret;
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+
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+ /* Multiplatform guard, only proceed on Gemini */
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+ if (!of_machine_is_compatible("cortina,gemini"))
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+ return 0;
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+
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+ map = syscon_regmap_lookup_by_compatible("cortina,gemini-syscon");
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+ if (IS_ERR(map))
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+ return PTR_ERR(map);
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+ ret = regmap_read(map, GLOBAL_WORD_ID, &rev);
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+ if (ret)
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+ return ret;
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+
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+ val = (GEMINI_DEFAULT_BURST_SIZE << GEMINI_ARB1_BURST_SHIFT) |
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+ GEMINI_DEFAULT_PRIO;
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+
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+ /* Set up system arbitration */
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+ regmap_update_bits(map,
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+ GEMINI_GLOBAL_ARB1_CTRL,
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+ GEMINI_ARB1_BURST_MASK | GEMINI_ARB1_PRIO_MASK,
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+ val);
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+
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+ pr_info("Gemini SoC %04x revision %02x, set arbitration %08x\n",
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+ rev >> 8, rev & 0xff, val);
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+
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+ return 0;
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+}
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+subsys_initcall(gemini_soc_init);
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