oxnas: add SoC restart driver for reboot

Refresh oxnas kernel config while at it.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 229 insertions, 0 deletions

diff --git a/target/linux/oxnas/files/drivers/power/reset/oxnas-restart.c b/target/linux/oxnas/files/drivers/power/reset/oxnas-restart.c
new file mode 100644
index 0000000000..5664914ea4
--- /dev/null
+++ b/target/linux/oxnas/files/drivers/power/reset/oxnas-restart.c
@@ -0,0 +1,229 @@
+// SPDX-License-Identifier: (GPL-2.0)
+/*
+ * oxnas SoC reset driver
+ * based on:
+ * Microsemi MIPS SoC reset driver
+ * and ox820_assert_system_reset() written by Ma Hajun <mahaijuns@gmail.com>
+ *
+ * License: GPL
+ * Copyright (c) 2013 Ma Hajun <mahaijuns@gmail.com>
+ * Copyright (c) 2017 Microsemi Corporation
+ * Copyright (c) 2019 Daniel Golle <daniel@makrotopia.org>
+ */
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/notifier.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+
+/* bit numbers of reset control register */
+#define SYS_CTRL_RST_SCU                0
+#define SYS_CTRL_RST_COPRO              1
+#define SYS_CTRL_RST_ARM0               2
+#define SYS_CTRL_RST_ARM1               3
+#define SYS_CTRL_RST_USBHS              4
+#define SYS_CTRL_RST_USBHSPHYA          5
+#define SYS_CTRL_RST_MACA               6
+#define SYS_CTRL_RST_MAC                SYS_CTRL_RST_MACA
+#define SYS_CTRL_RST_PCIEA              7
+#define SYS_CTRL_RST_SGDMA              8
+#define SYS_CTRL_RST_CIPHER             9
+#define SYS_CTRL_RST_DDR                10
+#define SYS_CTRL_RST_SATA               11
+#define SYS_CTRL_RST_SATA_LINK          12
+#define SYS_CTRL_RST_SATA_PHY           13
+#define SYS_CTRL_RST_PCIEPHY            14
+#define SYS_CTRL_RST_STATIC             15
+#define SYS_CTRL_RST_GPIO               16
+#define SYS_CTRL_RST_UART1              17
+#define SYS_CTRL_RST_UART2              18
+#define SYS_CTRL_RST_MISC               19
+#define SYS_CTRL_RST_I2S                20
+#define SYS_CTRL_RST_SD                 21
+#define SYS_CTRL_RST_MACB               22
+#define SYS_CTRL_RST_PCIEB              23
+#define SYS_CTRL_RST_VIDEO              24
+#define SYS_CTRL_RST_DDR_PHY            25
+#define SYS_CTRL_RST_USBHSPHYB          26
+#define SYS_CTRL_RST_USBDEV             27
+#define SYS_CTRL_RST_ARMDBG             29
+#define SYS_CTRL_RST_PLLA               30
+#define SYS_CTRL_RST_PLLB               31
+
+/* bit numbers of clock control register */
+#define SYS_CTRL_CLK_COPRO              0
+#define SYS_CTRL_CLK_DMA                1
+#define SYS_CTRL_CLK_CIPHER             2
+#define SYS_CTRL_CLK_SD                 3
+#define SYS_CTRL_CLK_SATA               4
+#define SYS_CTRL_CLK_I2S                5
+#define SYS_CTRL_CLK_USBHS              6
+#define SYS_CTRL_CLK_MACA               7
+#define SYS_CTRL_CLK_MAC                SYS_CTRL_CLK_MACA
+#define SYS_CTRL_CLK_PCIEA              8
+#define SYS_CTRL_CLK_STATIC             9
+#define SYS_CTRL_CLK_MACB               10
+#define SYS_CTRL_CLK_PCIEB              11
+#define SYS_CTRL_CLK_REF600             12
+#define SYS_CTRL_CLK_USBDEV             13
+#define SYS_CTRL_CLK_DDR                14
+#define SYS_CTRL_CLK_DDRPHY             15
+#define SYS_CTRL_CLK_DDRCK              16
+
+/* Regmap offsets */
+#define CLK_SET_REGOFFSET               0x2c
+#define CLK_CLR_REGOFFSET               0x30
+#define RST_SET_REGOFFSET               0x34
+#define RST_CLR_REGOFFSET               0x38
+#define SECONDARY_SEL_REGOFFSET         0x14
+#define TERTIARY_SEL_REGOFFSET          0x8c
+#define QUATERNARY_SEL_REGOFFSET        0x94
+#define DEBUG_SEL_REGOFFSET             0x9c
+#define ALTERNATIVE_SEL_REGOFFSET       0xa4
+#define PULLUP_SEL_REGOFFSET            0xac
+#define SEC_SECONDARY_SEL_REGOFFSET     0x100014
+#define SEC_TERTIARY_SEL_REGOFFSET      0x10008c
+#define SEC_QUATERNARY_SEL_REGOFFSET    0x100094
+#define SEC_DEBUG_SEL_REGOFFSET         0x10009c
+#define SEC_ALTERNATIVE_SEL_REGOFFSET   0x1000a4
+#define SEC_PULLUP_SEL_REGOFFSET        0x1000ac
+
+
+struct oxnas_restart_context {
+	struct regmap *sys_ctrl;
+	struct notifier_block restart_handler;
+};
+
+static int oxnas_restart_handle(struct notifier_block *this,
+				 unsigned long mode, void *cmd)
+{
+	struct oxnas_restart_context *ctx = container_of(this, struct
+							oxnas_restart_context,
+							restart_handler);
+	u32 value;
+
+	/* Assert reset to cores as per power on defaults
+	 * Don't touch the DDR interface as things will come to an impromptu stop
+	 * NB Possibly should be asserting reset for PLLB, but there are timing
+	 *    concerns here according to the docs */
+	value = BIT(SYS_CTRL_RST_COPRO)		|
+		BIT(SYS_CTRL_RST_USBHS)		|
+		BIT(SYS_CTRL_RST_USBHSPHYA)	|
+		BIT(SYS_CTRL_RST_MACA)		|
+		BIT(SYS_CTRL_RST_PCIEA)		|
+		BIT(SYS_CTRL_RST_SGDMA)		|
+		BIT(SYS_CTRL_RST_CIPHER)	|
+		BIT(SYS_CTRL_RST_SATA)		|
+		BIT(SYS_CTRL_RST_SATA_LINK)	|
+		BIT(SYS_CTRL_RST_SATA_PHY)	|
+		BIT(SYS_CTRL_RST_PCIEPHY)	|
+		BIT(SYS_CTRL_RST_STATIC)	|
+		BIT(SYS_CTRL_RST_UART1)		|
+		BIT(SYS_CTRL_RST_UART2)		|
+		BIT(SYS_CTRL_RST_MISC)		|
+		BIT(SYS_CTRL_RST_I2S)		|
+		BIT(SYS_CTRL_RST_SD)		|
+		BIT(SYS_CTRL_RST_MACB)		|
+		BIT(SYS_CTRL_RST_PCIEB)		|
+		BIT(SYS_CTRL_RST_VIDEO)		|
+		BIT(SYS_CTRL_RST_USBHSPHYB)	|
+		BIT(SYS_CTRL_RST_USBDEV);
+
+	regmap_write(ctx->sys_ctrl, RST_SET_REGOFFSET, value);
+
+	/* Release reset to cores as per power on defaults */
+	regmap_write(ctx->sys_ctrl, RST_CLR_REGOFFSET, BIT(SYS_CTRL_RST_GPIO));
+
+	/* Disable clocks to cores as per power-on defaults - must leave DDR
+	 * related clocks enabled otherwise we'll stop rather abruptly. */
+	value =
+		BIT(SYS_CTRL_CLK_COPRO)		|
+		BIT(SYS_CTRL_CLK_DMA)		|
+		BIT(SYS_CTRL_CLK_CIPHER)	|
+		BIT(SYS_CTRL_CLK_SD)		|
+		BIT(SYS_CTRL_CLK_SATA)		|
+		BIT(SYS_CTRL_CLK_I2S)		|
+		BIT(SYS_CTRL_CLK_USBHS)		|
+		BIT(SYS_CTRL_CLK_MAC)		|
+		BIT(SYS_CTRL_CLK_PCIEA)		|
+		BIT(SYS_CTRL_CLK_STATIC)	|
+		BIT(SYS_CTRL_CLK_MACB)		|
+		BIT(SYS_CTRL_CLK_PCIEB)		|
+		BIT(SYS_CTRL_CLK_REF600)	|
+		BIT(SYS_CTRL_CLK_USBDEV);
+
+	regmap_write(ctx->sys_ctrl, CLK_CLR_REGOFFSET, value);
+
+	/* Enable clocks to cores as per power-on defaults */
+
+	/* Set sys-control pin mux'ing as per power-on defaults */
+	regmap_write(ctx->sys_ctrl, SECONDARY_SEL_REGOFFSET, 0);
+	regmap_write(ctx->sys_ctrl, TERTIARY_SEL_REGOFFSET, 0);
+	regmap_write(ctx->sys_ctrl, QUATERNARY_SEL_REGOFFSET, 0);
+	regmap_write(ctx->sys_ctrl, DEBUG_SEL_REGOFFSET, 0);
+	regmap_write(ctx->sys_ctrl, ALTERNATIVE_SEL_REGOFFSET, 0);
+	regmap_write(ctx->sys_ctrl, PULLUP_SEL_REGOFFSET, 0);
+
+	regmap_write(ctx->sys_ctrl, SEC_SECONDARY_SEL_REGOFFSET, 0);
+	regmap_write(ctx->sys_ctrl, SEC_TERTIARY_SEL_REGOFFSET, 0);
+	regmap_write(ctx->sys_ctrl, SEC_QUATERNARY_SEL_REGOFFSET, 0);
+	regmap_write(ctx->sys_ctrl, SEC_DEBUG_SEL_REGOFFSET, 0);
+	regmap_write(ctx->sys_ctrl, SEC_ALTERNATIVE_SEL_REGOFFSET, 0);
+	regmap_write(ctx->sys_ctrl, SEC_PULLUP_SEL_REGOFFSET, 0);
+
+	/* No need to save any state, as the ROM loader can determine whether
+	 * reset is due to power cycling or programatic action, just hit the
+	 * (self-clearing) CPU reset bit of the block reset register */
+	value =
+		BIT(SYS_CTRL_RST_SCU) |
+		BIT(SYS_CTRL_RST_ARM0) |
+		BIT(SYS_CTRL_RST_ARM1);
+
+	regmap_write(ctx->sys_ctrl, RST_SET_REGOFFSET, value);
+
+	pr_emerg("Unable to restart system\n");
+	return NOTIFY_DONE;
+}
+
+static int oxnas_restart_probe(struct platform_device *pdev)
+{
+	struct oxnas_restart_context *ctx;
+	struct regmap *sys_ctrl;
+	struct device *dev = &pdev->dev;
+	int err = 0;
+
+	sys_ctrl = syscon_regmap_lookup_by_compatible("oxsemi,ox820-sys-ctrl");
+	if (IS_ERR(sys_ctrl))
+		return PTR_ERR(sys_ctrl);
+
+	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->sys_ctrl = sys_ctrl;
+	ctx->restart_handler.notifier_call = oxnas_restart_handle;
+	ctx->restart_handler.priority = 192;
+	err = register_restart_handler(&ctx->restart_handler);
+	if (err)
+		dev_err(dev, "can't register restart notifier (err=%d)\n", err);
+
+	return err;
+}
+
+static const struct of_device_id oxnas_restart_of_match[] = {
+	{ .compatible = "oxsemi,ox820-sys-ctrl" },
+	{}
+};
+
+static struct platform_driver oxnas_restart_driver = {
+	.probe = oxnas_restart_probe,
+	.driver = {
+		.name = "oxnas-chip-reset",
+		.of_match_table = oxnas_restart_of_match,
+	},
+};
+builtin_platform_driver(oxnas_restart_driver);