[PATCH v2] misc: nuvoton: Add host interface configuartion driver

[Jim Liu]

add nuvoton BMC npcm750 host configuartion driver

Signed-off-by: Jim Liu <JJLIU0 at nuvoton.com>
---
Changes for v2:
   - add kconfig and use depend for kconfig
---
 drivers/misc/Kconfig          |   6 ++
 drivers/misc/Makefile         |   1 +
 drivers/misc/npcm_host_intf.c | 110 ++++++++++++++++++++++++++++++++++
 3 files changed, 117 insertions(+)
 create mode 100644 drivers/misc/npcm_host_intf.c

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 85ae7f62e9..265a7e510d 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -282,6 +282,12 @@ config MXC_OCOTP
 	  Programmable memory pages that are stored on the some
 	  Freescale i.MX processors.
 
+config NPCM_HOST
+	bool "Enable support espi or LPC for Host"
+	depends on REGMAP && SYSCON
+	help
+	  Enable NPCM BMC espi or LPC support for Host reading and writing.
+
 config SPL_MXC_OCOTP
 	bool "Enable MXC OCOTP driver in SPL"
 	depends on SPL && (ARCH_IMX8M || ARCH_MX6 || ARCH_MX7 || ARCH_MX7ULP || ARCH_VF610)
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 7a6047f64f..51a534d535 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_LED_STATUS_GPIO) += gpio_led.o
 obj-$(CONFIG_MPC83XX_SERDES) += mpc83xx_serdes.o
 obj-$(CONFIG_$(SPL_)MXC_OCOTP) += mxc_ocotp.o
 obj-$(CONFIG_MXS_OCOTP) += mxs_ocotp.o
+obj-$(CONFIG_NPCM_HOST) += npcm_host_intf.o
 obj-$(CONFIG_NUVOTON_NCT6102D) += nuvoton_nct6102d.o
 obj-$(CONFIG_P2SB) += p2sb-uclass.o
 obj-$(CONFIG_PCA9551_LED) += pca9551_led.o
diff --git a/drivers/misc/npcm_host_intf.c b/drivers/misc/npcm_host_intf.c
new file mode 100644
index 0000000000..0244e40457
--- /dev/null
+++ b/drivers/misc/npcm_host_intf.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Host interface (LPC or eSPI) configuration on Nuvoton BMC
+ * Copyright (c) 2022 Nuvoton Technology Corp.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include <dm/device_compat.h>
+#include <linux/bitfield.h>
+
+#define SMC_CTL_REG_ADDR	0xc0001001
+#define SMC_CTL_HOSTWAIT	0x80
+
+/* GCR Register Offsets */
+#define HIFCR			0x50
+#define MFSEL1			0x260
+#define MFSEL4			0x26c
+
+/* ESPI Register offsets */
+#define ESPICFG			0x4
+#define ESPIHINDP		0x80
+
+/* MFSEL bit fileds */
+#define MFSEL1_LPCSEL		BIT(26)
+#define MFSEL4_ESPISEL		BIT(8)
+
+/* ESPICFG bit fileds */
+#define CHSUPP_MASK		GENMASK(27, 24)
+#define IOMODE_MASK		GENMASK(9, 8)
+#define IOMODE_SDQ		FIELD_PREP(IOMODE_MASK, 3)
+#define MAXFREQ_MASK		GENMASK(12, 10)
+#define MAXFREQ_33MHZ		FIELD_PREP(MAXFREQ_MASK, 2)
+
+/* ESPIHINDP bit fileds */
+#define AUTO_SBLD		BIT(4)
+#define AUTO_HS1		BIT(8)
+#define AUTO_HS2		BIT(12)
+#define AUTO_HS3		BIT(16)
+
+static int npcm_host_intf_bind(struct udevice *dev)
+{
+	struct regmap *syscon;
+	void __iomem *base;
+	u32 ch_supp, val;
+	u32 ioaddr;
+	const char *type;
+	int ret;
+
+	/* Release host wait */
+	setbits_8(SMC_CTL_REG_ADDR, SMC_CTL_HOSTWAIT);
+
+	syscon = syscon_regmap_lookup_by_phandle(dev, "syscon");
+	if (IS_ERR(syscon)) {
+		dev_err(dev, "%s: unable to get syscon, dev %s\n", __func__, dev->name);
+		return PTR_ERR(syscon);
+	}
+
+	ioaddr  = dev_read_u32_default(dev, "ioaddr", 0);
+	if (ioaddr)
+		regmap_write(syscon, HIFCR, ioaddr);
+
+	type = dev_read_string(dev, "type");
+	if (!type)
+		return -EINVAL;
+
+	if (!strcmp(type, "espi")) {
+		base = dev_read_addr_ptr(dev);
+		if (!base)
+			return -EINVAL;
+
+		ret = dev_read_u32(dev, "channel-support", &ch_supp);
+		if (ret)
+			return ret;
+
+		/* Select eSPI pins function */
+		regmap_update_bits(syscon, MFSEL1, MFSEL1_LPCSEL, 0);
+		regmap_update_bits(syscon, MFSEL4, MFSEL4_ESPISEL, MFSEL4_ESPISEL);
+
+		val = AUTO_SBLD | AUTO_HS1 | AUTO_HS2 | AUTO_HS3 | ch_supp;
+		writel(val, base + ESPIHINDP);
+
+		val = readl(base + ESPICFG);
+		val &= ~(CHSUPP_MASK | IOMODE_MASK | MAXFREQ_MASK);
+		val |= IOMODE_SDQ | MAXFREQ_33MHZ | FIELD_PREP(CHSUPP_MASK, ch_supp);
+		writel(val, base + ESPICFG);
+	} else if (!strcmp(type, "lpc")) {
+		/* Select LPC pin function */
+		regmap_update_bits(syscon, MFSEL4, MFSEL4_ESPISEL, 0);
+		regmap_update_bits(syscon, MFSEL1, MFSEL1_LPCSEL, MFSEL1_LPCSEL);
+	}
+
+	return 0;
+}
+
+static const struct udevice_id npcm_hostintf_ids[] = {
+	{ .compatible = "nuvoton,npcm750-host-intf" },
+	{ .compatible = "nuvoton,npcm845-host-intf" },
+	{ }
+};
+
+U_BOOT_DRIVER(npcm_host_intf) = {
+	.name	= "npcm_host_intf",
+	.id	= UCLASS_MISC,
+	.of_match = npcm_hostintf_ids,
+	.bind = npcm_host_intf_bind,
+};
-- 
2.17.1