diff options
Diffstat (limited to 'target/linux/gemini/patches-4.14/0020-soc-Add-SoC-driver-for-Gemini.patch')
| -rw-r--r-- | target/linux/gemini/patches-4.14/0020-soc-Add-SoC-driver-for-Gemini.patch | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/target/linux/gemini/patches-4.14/0020-soc-Add-SoC-driver-for-Gemini.patch b/target/linux/gemini/patches-4.14/0020-soc-Add-SoC-driver-for-Gemini.patch new file mode 100644 index 0000000000..f1bbe0a15f --- /dev/null +++ b/target/linux/gemini/patches-4.14/0020-soc-Add-SoC-driver-for-Gemini.patch @@ -0,0 +1,113 @@ +From b0a88a861b036124ef2d6acfe6dd87cfde63e750 Mon Sep 17 00:00:00 2001 +From: Linus Walleij <linus.walleij@linaro.org> +Date: Fri, 22 Dec 2017 00:19:08 +0100 +Subject: [PATCH 20/31] soc: Add SoC driver for Gemini + +This adds an SoC driver for the Gemini. Currently there +is only one thing not fitting into any other framework, +and that is the bus arbitration setting. + +All Gemini vendor trees seem to be setting this register to +exactly the same arbitration so we just add a small code +snippet to do this at subsys_init() time before any other +drivers kick in. + +Signed-off-by: Linus Walleij <linus.walleij@linaro.org> +Signed-off-by: Arnd Bergmann <arnd@arndb.de> +--- + drivers/soc/Makefile | 1 + + drivers/soc/gemini/Makefile | 2 ++ + drivers/soc/gemini/soc-gemini.c | 71 +++++++++++++++++++++++++++++++++++++++++ + 3 files changed, 74 insertions(+) + create mode 100644 drivers/soc/gemini/Makefile + create mode 100644 drivers/soc/gemini/soc-gemini.c + +--- a/drivers/soc/Makefile ++++ b/drivers/soc/Makefile +@@ -9,6 +9,7 @@ obj-y += bcm/ + obj-$(CONFIG_ARCH_DOVE) += dove/ + obj-$(CONFIG_MACH_DOVE) += dove/ + obj-y += fsl/ ++obj-$(CONFIG_ARCH_GEMINI) += gemini/ + obj-$(CONFIG_ARCH_MXC) += imx/ + obj-$(CONFIG_SOC_XWAY) += lantiq/ + obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/ +--- /dev/null ++++ b/drivers/soc/gemini/Makefile +@@ -0,0 +1,2 @@ ++# SPDX-License-Identifier: GPL-2.0 ++obj-y += soc-gemini.o +--- /dev/null ++++ b/drivers/soc/gemini/soc-gemini.c +@@ -0,0 +1,71 @@ ++// SPDX-License-Identifier: GPL-2.0 ++/* ++ * Copyright (C) 2017 Linaro Ltd. ++ * ++ * Author: Linus Walleij <linus.walleij@linaro.org> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2, as ++ * published by the Free Software Foundation. ++ * ++ */ ++#include <linux/init.h> ++#include <linux/kernel.h> ++#include <linux/mfd/syscon.h> ++#include <linux/regmap.h> ++#include <linux/of.h> ++ ++#define GLOBAL_WORD_ID 0x00 ++#define GEMINI_GLOBAL_ARB1_CTRL 0x2c ++#define GEMINI_ARB1_BURST_MASK GENMASK(21, 16) ++#define GEMINI_ARB1_BURST_SHIFT 16 ++/* These all define the priority on the BUS2 backplane */ ++#define GEMINI_ARB1_PRIO_MASK GENMASK(9, 0) ++#define GEMINI_ARB1_DMAC_HIGH_PRIO BIT(0) ++#define GEMINI_ARB1_IDE_HIGH_PRIO BIT(1) ++#define GEMINI_ARB1_RAID_HIGH_PRIO BIT(2) ++#define GEMINI_ARB1_SECURITY_HIGH_PRIO BIT(3) ++#define GEMINI_ARB1_GMAC0_HIGH_PRIO BIT(4) ++#define GEMINI_ARB1_GMAC1_HIGH_PRIO BIT(5) ++#define GEMINI_ARB1_USB0_HIGH_PRIO BIT(6) ++#define GEMINI_ARB1_USB1_HIGH_PRIO BIT(7) ++#define GEMINI_ARB1_PCI_HIGH_PRIO BIT(8) ++#define GEMINI_ARB1_TVE_HIGH_PRIO BIT(9) ++ ++#define GEMINI_DEFAULT_BURST_SIZE 0x20 ++#define GEMINI_DEFAULT_PRIO (GEMINI_ARB1_GMAC0_HIGH_PRIO | \ ++ GEMINI_ARB1_GMAC1_HIGH_PRIO) ++ ++static int __init gemini_soc_init(void) ++{ ++ struct regmap *map; ++ u32 rev; ++ u32 val; ++ int ret; ++ ++ /* Multiplatform guard, only proceed on Gemini */ ++ if (!of_machine_is_compatible("cortina,gemini")) ++ return 0; ++ ++ map = syscon_regmap_lookup_by_compatible("cortina,gemini-syscon"); ++ if (IS_ERR(map)) ++ return PTR_ERR(map); ++ ret = regmap_read(map, GLOBAL_WORD_ID, &rev); ++ if (ret) ++ return ret; ++ ++ val = (GEMINI_DEFAULT_BURST_SIZE << GEMINI_ARB1_BURST_SHIFT) | ++ GEMINI_DEFAULT_PRIO; ++ ++ /* Set up system arbitration */ ++ regmap_update_bits(map, ++ GEMINI_GLOBAL_ARB1_CTRL, ++ GEMINI_ARB1_BURST_MASK | GEMINI_ARB1_PRIO_MASK, ++ val); ++ ++ pr_info("Gemini SoC %04x revision %02x, set arbitration %08x\n", ++ rev >> 8, rev & 0xff, val); ++ ++ return 0; ++} ++subsys_initcall(gemini_soc_init); |