From: Conor Dooley <conor.dooley@microchip.com>
To: Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>, Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Conor Dooley <conor.dooley@microchip.com>,
Daire McNamara <daire.mcnamara@microchip.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Claudiu Beznea <claudiu.beznea@microchip.com>,
<linux-clk@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-riscv@lists.infradead.org>
Subject: [PATCH v5 04/14] clk: microchip: mpfs: add reset controller
Date: Fri, 9 Sep 2022 13:31:13 +0100 [thread overview]
Message-ID: <20220909123123.2699583-5-conor.dooley@microchip.com> (raw)
In-Reply-To: <20220909123123.2699583-1-conor.dooley@microchip.com>
Add a reset controller to PolarFire SoC's clock driver. This reset
controller is registered as an aux device and read/write functions
exported to the drivers namespace so that the reset controller can
access the peripheral device reset register.
Reviewed-by: Daire McNamara <daire.mcnamara@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
drivers/clk/microchip/Kconfig | 1 +
drivers/clk/microchip/clk-mpfs.c | 110 +++++++++++++++++++++++++++----
include/soc/microchip/mpfs.h | 8 +++
3 files changed, 107 insertions(+), 12 deletions(-)
diff --git a/drivers/clk/microchip/Kconfig b/drivers/clk/microchip/Kconfig
index a5a99873c4f5..b46e864b3bd8 100644
--- a/drivers/clk/microchip/Kconfig
+++ b/drivers/clk/microchip/Kconfig
@@ -6,5 +6,6 @@ config COMMON_CLK_PIC32
config MCHP_CLK_MPFS
bool "Clk driver for PolarFire SoC"
depends on (RISCV && SOC_MICROCHIP_POLARFIRE) || COMPILE_TEST
+ select AUXILIARY_BUS
help
Supports Clock Configuration for PolarFire SoC
diff --git a/drivers/clk/microchip/clk-mpfs.c b/drivers/clk/microchip/clk-mpfs.c
index b6b89413e090..610c81ecc526 100644
--- a/drivers/clk/microchip/clk-mpfs.c
+++ b/drivers/clk/microchip/clk-mpfs.c
@@ -3,12 +3,14 @@
* Daire McNamara,<daire.mcnamara@microchip.com>
* Copyright (C) 2020 Microchip Technology Inc. All rights reserved.
*/
+#include <linux/auxiliary_bus.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <dt-bindings/clock/microchip,mpfs-clock.h>
+#include <soc/microchip/mpfs.h>
/* address offset of control registers */
#define REG_MSSPLL_REF_CR 0x08u
@@ -28,6 +30,7 @@
#define MSSPLL_FIXED_DIV 4u
struct mpfs_clock_data {
+ struct device *dev;
void __iomem *base;
void __iomem *msspll_base;
struct clk_hw_onecell_data hw_data;
@@ -307,10 +310,6 @@ static int mpfs_periph_clk_enable(struct clk_hw *hw)
spin_lock_irqsave(&mpfs_clk_lock, flags);
- reg = readl_relaxed(base_addr + REG_SUBBLK_RESET_CR);
- val = reg & ~(1u << periph->shift);
- writel_relaxed(val, base_addr + REG_SUBBLK_RESET_CR);
-
reg = readl_relaxed(base_addr + REG_SUBBLK_CLOCK_CR);
val = reg | (1u << periph->shift);
writel_relaxed(val, base_addr + REG_SUBBLK_CLOCK_CR);
@@ -344,12 +343,9 @@ static int mpfs_periph_clk_is_enabled(struct clk_hw *hw)
void __iomem *base_addr = periph_hw->sys_base;
u32 reg;
- reg = readl_relaxed(base_addr + REG_SUBBLK_RESET_CR);
- if ((reg & (1u << periph->shift)) == 0u) {
- reg = readl_relaxed(base_addr + REG_SUBBLK_CLOCK_CR);
- if (reg & (1u << periph->shift))
- return 1;
- }
+ reg = readl_relaxed(base_addr + REG_SUBBLK_CLOCK_CR);
+ if (reg & (1u << periph->shift))
+ return 1;
return 0;
}
@@ -445,6 +441,94 @@ static int mpfs_clk_register_periphs(struct device *dev, struct mpfs_periph_hw_c
return 0;
}
+/*
+ * Peripheral clock resets
+ */
+
+#if IS_ENABLED(CONFIG_RESET_CONTROLLER)
+
+u32 mpfs_reset_read(struct device *dev)
+{
+ struct mpfs_clock_data *clock_data = dev_get_drvdata(dev->parent);
+
+ return readl_relaxed(clock_data->base + REG_SUBBLK_RESET_CR);
+}
+EXPORT_SYMBOL_NS_GPL(mpfs_reset_read, MCHP_CLK_MPFS);
+
+void mpfs_reset_write(struct device *dev, u32 val)
+{
+ struct mpfs_clock_data *clock_data = dev_get_drvdata(dev->parent);
+
+ writel_relaxed(val, clock_data->base + REG_SUBBLK_RESET_CR);
+}
+EXPORT_SYMBOL_NS_GPL(mpfs_reset_write, MCHP_CLK_MPFS);
+
+static void mpfs_reset_unregister_adev(void *_adev)
+{
+ struct auxiliary_device *adev = _adev;
+
+ auxiliary_device_delete(adev);
+}
+
+static void mpfs_reset_adev_release(struct device *dev)
+{
+ struct auxiliary_device *adev = to_auxiliary_dev(dev);
+
+ auxiliary_device_uninit(adev);
+
+ kfree(adev);
+}
+
+static struct auxiliary_device *mpfs_reset_adev_alloc(struct mpfs_clock_data *clk_data)
+{
+ struct auxiliary_device *adev;
+ int ret;
+
+ adev = kzalloc(sizeof(*adev), GFP_KERNEL);
+ if (!adev)
+ return ERR_PTR(-ENOMEM);
+
+ adev->name = "reset-mpfs";
+ adev->dev.parent = clk_data->dev;
+ adev->dev.release = mpfs_reset_adev_release;
+ adev->id = 666u;
+
+ ret = auxiliary_device_init(adev);
+ if (ret) {
+ kfree(adev);
+ return ERR_PTR(ret);
+ }
+
+ return adev;
+}
+
+static int mpfs_reset_controller_register(struct mpfs_clock_data *clk_data)
+{
+ struct auxiliary_device *adev;
+ int ret;
+
+ adev = mpfs_reset_adev_alloc(clk_data);
+ if (IS_ERR(adev))
+ return PTR_ERR(adev);
+
+ ret = auxiliary_device_add(adev);
+ if (ret) {
+ auxiliary_device_uninit(adev);
+ return ret;
+ }
+
+ return devm_add_action_or_reset(clk_data->dev, mpfs_reset_unregister_adev, adev);
+}
+
+#else /* !CONFIG_RESET_CONTROLLER */
+
+static int mpfs_reset_controller_register(struct mpfs_clock_data *clk_data)
+{
+ return 0;
+}
+
+#endif /* !CONFIG_RESET_CONTROLLER */
+
static int mpfs_clk_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -469,6 +553,8 @@ static int mpfs_clk_probe(struct platform_device *pdev)
return PTR_ERR(clk_data->msspll_base);
clk_data->hw_data.num = num_clks;
+ clk_data->dev = dev;
+ dev_set_drvdata(dev, clk_data);
ret = mpfs_clk_register_mssplls(dev, mpfs_msspll_clks, ARRAY_SIZE(mpfs_msspll_clks),
clk_data);
@@ -488,14 +574,14 @@ static int mpfs_clk_probe(struct platform_device *pdev)
if (ret)
return ret;
- return ret;
+ return mpfs_reset_controller_register(clk_data);
}
static const struct of_device_id mpfs_clk_of_match_table[] = {
{ .compatible = "microchip,mpfs-clkcfg", },
{}
};
-MODULE_DEVICE_TABLE(of, mpfs_clk_match_table);
+MODULE_DEVICE_TABLE(of, mpfs_clk_of_match_table);
static struct platform_driver mpfs_clk_driver = {
.probe = mpfs_clk_probe,
diff --git a/include/soc/microchip/mpfs.h b/include/soc/microchip/mpfs.h
index 6466515262bd..f916dcde457f 100644
--- a/include/soc/microchip/mpfs.h
+++ b/include/soc/microchip/mpfs.h
@@ -40,4 +40,12 @@ struct mpfs_sys_controller *mpfs_sys_controller_get(struct device *dev);
#endif /* if IS_ENABLED(CONFIG_POLARFIRE_SOC_SYS_CTRL) */
+#if IS_ENABLED(CONFIG_MCHP_CLK_MPFS)
+
+u32 mpfs_reset_read(struct device *dev);
+
+void mpfs_reset_write(struct device *dev, u32 val);
+
+#endif /* if IS_ENABLED(CONFIG_MCHP_CLK_MPFS) */
+
#endif /* __SOC_MPFS_H__ */
--
2.36.1
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next prev parent reply other threads:[~2022-09-09 12:32 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-09 12:31 [PATCH v5 00/14] PolarFire SoC reset controller & clock cleanups Conor Dooley
2022-09-09 12:31 ` [PATCH v5 01/14] clk: microchip: mpfs: fix clk_cfg array bounds violation Conor Dooley
2022-09-12 7:40 ` Claudiu.Beznea
2022-09-29 0:30 ` Stephen Boyd
2022-09-29 0:32 ` Stephen Boyd
2022-09-09 12:31 ` [PATCH v5 02/14] clk: microchip: mpfs: make the rtc's ahb clock critical Conor Dooley
2022-09-09 12:31 ` [PATCH v5 03/14] dt-bindings: clk: microchip: mpfs: add reset controller support Conor Dooley
2022-09-09 12:31 ` Conor Dooley [this message]
2022-09-09 12:31 ` [PATCH v5 05/14] reset: add polarfire soc reset support Conor Dooley
2022-09-09 12:31 ` [PATCH v5 06/14] MAINTAINERS: add polarfire soc reset controller Conor Dooley
2022-09-09 12:31 ` [PATCH v5 07/14] riscv: dts: microchip: add mpfs specific macb reset support Conor Dooley
2023-03-07 15:16 ` Conor Dooley
2022-09-09 12:31 ` [PATCH v5 08/14] clk: microchip: mpfs: add MSS pll's set & round rate Conor Dooley
2022-09-09 12:31 ` [PATCH v5 09/14] clk: microchip: mpfs: move id & offset out of clock structs Conor Dooley
2022-09-09 12:31 ` [PATCH v5 10/14] clk: microchip: mpfs: simplify control reg access Conor Dooley
2022-09-09 12:31 ` [PATCH v5 11/14] clk: microchip: mpfs: delete 2 line mpfs_clk_register_foo() Conor Dooley
2022-09-09 12:31 ` [PATCH v5 12/14] clk: microchip: mpfs: convert cfg_clk to clk_divider Conor Dooley
2022-09-09 12:31 ` [PATCH v5 13/14] clk: microchip: mpfs: convert periph_clk to clk_gate Conor Dooley
2022-09-09 12:31 ` [PATCH v5 14/14] clk: microchip: mpfs: update module authorship & licencing Conor Dooley
2022-09-09 12:34 ` [PATCH v5 00/14] PolarFire SoC reset controller & clock cleanups Conor.Dooley
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