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Date:   Tue, 24 Jan 2017 15:05:24 +0800
From:   "zhichang.yuan" <yuanzhichang@...ilicon.com>
To:     <catalin.marinas@....com>, <will.deacon@....com>,
        <robh+dt@...nel.org>, <frowand.list@...il.com>,
        <bhelgaas@...gle.com>, <rafael@...nel.org>, <mark.rutland@....com>,
        <brian.starkey@....com>, <olof@...om.net>, <arnd@...db.de>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <lorenzo.pieralisi@....com>, <benh@...nel.crashing.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <devicetree@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-serial@...r.kernel.org>, <minyard@....org>,
        <liviu.dudau@....com>, <zourongrong@...il.com>,
        <john.garry@...wei.com>, <gabriele.paoloni@...wei.com>,
        <zhichang.yuan02@...il.com>, <kantyzc@....com>,
        <xuwei5@...ilicon.com>,
        "zhichang.yuan" <yuanzhichang@...ilicon.com>
Subject: [PATCH V6 4/5] LPC: Support the device-tree LPC host on Hip06/Hip07

The low-pin-count(LPC) interface of Hip06/Hip07 accesses the peripherals in
I/O port addresses. This patch implements the LPC host controller driver which
perform the I/O operations on the underlying hardware.
We don't want to touch those existing peripherals' driver, such as ipmi-bt. So
this driver applies the indirect-IO introduced in the previous patch after
registering an indirect-IO node to the indirect-IO devices list which will be
searched in the I/O accessors.
As the I/O translations for LPC children depend on the host I/O registration,
we should ensure the host I/O registration is finished before all the LPC
children scanning. That is why an arch_init() hook was added in this patch.

Signed-off-by: zhichang.yuan <yuanzhichang@...ilicon.com>
Signed-off-by: Gabriele Paoloni <gabriele.paoloni@...wei.com>
---
 .../arm/hisilicon/hisilicon-low-pin-count.txt      |  33 ++
 MAINTAINERS                                        |   9 +
 arch/arm64/boot/dts/hisilicon/hip06-d03.dts        |   4 +
 arch/arm64/boot/dts/hisilicon/hip06.dtsi           |  14 +
 drivers/bus/Kconfig                                |   8 +
 drivers/bus/Makefile                               |   1 +
 drivers/bus/hisi_lpc.c                             | 599 +++++++++++++++++++++
 7 files changed, 668 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/hisilicon/hisilicon-low-pin-count.txt
 create mode 100644 drivers/bus/hisi_lpc.c

diff --git a/Documentation/devicetree/bindings/arm/hisilicon/hisilicon-low-pin-count.txt b/Documentation/devicetree/bindings/arm/hisilicon/hisilicon-low-pin-count.txt
new file mode 100644
index 0000000..213181f
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/hisilicon/hisilicon-low-pin-count.txt
@@ -0,0 +1,33 @@
+Hisilicon Hip06 low-pin-count device
+  Hisilicon Hip06 SoCs implement a Low Pin Count (LPC) controller, which
+  provides I/O access to some legacy ISA devices.
+  Hip06 is based on arm64 architecture where there is no I/O space. So, the
+  I/O ports here are not cpu addresses, and there is no 'ranges' property in
+  LPC device node.
+
+Required properties:
+- compatible:  value should be as follows:
+	(a) "hisilicon,hip06-lpc"
+	(b) "hisilicon,hip07-lpc"
+- #address-cells: must be 2 which stick to the ISA/EISA binding doc.
+- #size-cells: must be 1 which stick to the ISA/EISA binding doc.
+- reg: base memory range where the LPC register set is mapped.
+
+Note:
+  The node name before '@' must be "isa" to represent the binding stick to the
+  ISA/EISA binding specification.
+
+Example:
+
+isa@...b0000 {
+	compatible = "hisilicon,hip06-lpc";
+	#address-cells = <2>;
+	#size-cells = <1>;
+	reg = <0x0 0xa01b0000 0x0 0x1000>;
+
+	ipmi0: bt@e4 {
+		compatible = "ipmi-bt";
+		device_type = "ipmi";
+		reg = <0x01 0xe4 0x04>;
+	};
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 26edd83..0153707 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5855,6 +5855,15 @@ F:	include/uapi/linux/if_hippi.h
 F:	net/802/hippi.c
 F:	drivers/net/hippi/
 
+HISILICON LPC BUS DRIVER
+M:	Zhichang Yuan <yuanzhichang@...ilicon.com>
+L:	linux-arm-kernel@...ts.infradead.org
+W:	http://www.hisilicon.com
+S:	Maintained
+F:	drivers/bus/hisi_lpc.c
+F:	lib/extio.c
+F:	Documentation/devicetree/bindings/arm/hisilicon/hisilicon-low-pin-count.txt
+
 HISILICON NETWORK SUBSYSTEM DRIVER
 M:	Yisen Zhuang <yisen.zhuang@...wei.com>
 M:	Salil Mehta <salil.mehta@...wei.com>
diff --git a/arch/arm64/boot/dts/hisilicon/hip06-d03.dts b/arch/arm64/boot/dts/hisilicon/hip06-d03.dts
index 7c4114a..75b2b5c 100644
--- a/arch/arm64/boot/dts/hisilicon/hip06-d03.dts
+++ b/arch/arm64/boot/dts/hisilicon/hip06-d03.dts
@@ -52,3 +52,7 @@
 &usb_ehci {
 	status = "ok";
 };
+
+&ipmi0 {
+	status = "ok";
+};
diff --git a/arch/arm64/boot/dts/hisilicon/hip06.dtsi b/arch/arm64/boot/dts/hisilicon/hip06.dtsi
index a049b64..c450f8d 100644
--- a/arch/arm64/boot/dts/hisilicon/hip06.dtsi
+++ b/arch/arm64/boot/dts/hisilicon/hip06.dtsi
@@ -318,6 +318,20 @@
 		#size-cells = <2>;
 		ranges;
 
+		isa@...b0000 {
+			compatible = "hisilicon,hip06-lpc";
+			#size-cells = <1>;
+			#address-cells = <2>;
+			reg = <0x0 0xa01b0000 0x0 0x1000>;
+
+			ipmi0: bt@e4 {
+				compatible = "ipmi-bt";
+				device_type = "ipmi";
+				reg = <0x01 0xe4 0x04>;
+				status = "disabled";
+			};
+		};
+
 		refclk: refclk {
 			compatible = "fixed-clock";
 			clock-frequency = <50000000>;
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index b9e8cfc..58cee84 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -64,6 +64,14 @@ config BRCMSTB_GISB_ARB
 	  arbiter. This driver provides timeout and target abort error handling
 	  and internal bus master decoding.
 
+config HISILICON_LPC
+	bool "Workaround for nonstandard ISA I/O space on Hisilicon Hip0X"
+	depends on (ARM64 && ARCH_HISI && PCI) || COMPILE_TEST
+	select INDIRECT_PIO
+	help
+	  Driver needed for some legacy ISA devices attached to Low-Pin-Count
+	  on Hisilicon Hip0X SoC.
+
 config IMX_WEIM
 	bool "Freescale EIM DRIVER"
 	depends on ARCH_MXC
diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index cc6364b..28e3862 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_ARM_CCI)		+= arm-cci.o
 obj-$(CONFIG_ARM_CCN)		+= arm-ccn.o
 
 obj-$(CONFIG_BRCMSTB_GISB_ARB)	+= brcmstb_gisb.o
+obj-$(CONFIG_HISILICON_LPC)	+= hisi_lpc.o
 obj-$(CONFIG_IMX_WEIM)		+= imx-weim.o
 obj-$(CONFIG_MIPS_CDMM)		+= mips_cdmm.o
 obj-$(CONFIG_MVEBU_MBUS) 	+= mvebu-mbus.o
diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c
new file mode 100644
index 0000000..a96e384
--- /dev/null
+++ b/drivers/bus/hisi_lpc.c
@@ -0,0 +1,599 @@
+/*
+ * Copyright (C) 2016 Hisilicon Limited, All Rights Reserved.
+ * Author: Zhichang Yuan <yuanzhichang@...ilicon.com>
+ * Author: Zou Rongrong <zourongrong@...wei.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/acpi.h>
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/pci.h>
+#include <linux/serial_8250.h>
+#include <linux/slab.h>
+
+/*
+ * Setting this bit means each IO operation will target to a
+ * different port address:
+ * 0 means repeatedly IO operations will stick on the same port,
+ * such as BT;
+ */
+#define FG_INCRADDR_LPC		0x02
+
+struct lpc_cycle_para {
+	unsigned int opflags;
+	unsigned int csize; /* the data length of each operation */
+};
+
+struct hisilpc_dev {
+	spinlock_t cycle_lock;
+	void __iomem  *membase;
+	struct extio_node *extio;
+};
+
+/* bounds of the LPC bus address range */
+#define LPC_MIN_BUS_RANGE	0x0
+
+/*
+ * The maximal IO size for each leagcy bus.
+ * The port size of legacy I/O devices is normally less than 0x400.
+ * Defining the I/O range size as 0x400 here should be sufficient for
+ * all peripherals under one bus.
+ */
+#define LPC_BUS_IO_SIZE		0x400
+
+/* The maximum continuous operations */
+#define LPC_MAX_OPCNT	16
+/* only support IO data unit length is four at maximum */
+#define LPC_MAX_DULEN	4
+#if LPC_MAX_DULEN > LPC_MAX_OPCNT
+#error "LPC.. MAX_DULEN must be not bigger than MAX_OPCNT!"
+#endif
+
+#define LPC_REG_START		0x00 /* start a new LPC cycle */
+#define LPC_REG_OP_STATUS	0x04 /* the current LPC status */
+#define LPC_REG_IRQ_ST		0x08 /* interrupt enable&status */
+#define LPC_REG_OP_LEN		0x10 /* how many LPC cycles each start */
+#define LPC_REG_CMD		0x14 /* command for the required LPC cycle */
+#define LPC_REG_ADDR		0x20 /* LPC target address */
+#define LPC_REG_WDATA		0x24 /* data to be written */
+#define LPC_REG_RDATA		0x28 /* data coming from peer */
+
+
+/* The command register fields */
+#define LPC_CMD_SAMEADDR	0x08
+#define LPC_CMD_TYPE_IO		0x00
+#define LPC_CMD_WRITE		0x01
+#define LPC_CMD_READ		0x00
+/* the bit attribute is W1C. 1 represents OK. */
+#define LPC_STAT_BYIRQ		0x02
+
+#define LPC_STATUS_IDLE		0x01
+#define LPC_OP_FINISHED		0x02
+
+#define START_WORK		0x01
+
+/*
+ * The minimal waiting interval... Suggest it is not less than 10.
+ * Bigger value probably will lower the performance.
+ */
+#define LPC_NSEC_PERWAIT	100
+/*
+ * The maximum waiting time is about 128us.
+ * The fastest IO cycle time is about 390ns, but the worst case will wait
+ * for extra 256 lpc clocks, so (256 + 13) * 30ns = 8 us. The maximum
+ * burst cycles is 16. So, the maximum waiting time is about 128us under
+ * worst case.
+ * choose 1300 as the maximum.
+ */
+#define LPC_MAX_WAITCNT		1300
+/* About 10us. This is specific for single IO operation, such as inb. */
+#define LPC_PEROP_WAITCNT	100
+
+
+static inline int wait_lpc_idle(unsigned char *mbase,
+				unsigned int waitcnt) {
+	u32 opstatus;
+
+	while (waitcnt--) {
+		ndelay(LPC_NSEC_PERWAIT);
+		opstatus = readl(mbase + LPC_REG_OP_STATUS);
+		if (opstatus & LPC_STATUS_IDLE)
+			return (opstatus & LPC_OP_FINISHED) ? 0 : (-EIO);
+	}
+	return -ETIME;
+}
+
+/*
+ * hisilpc_target_in - trigger a series of lpc cycles to read required data
+ *		       from target peripheral.
+ * @pdev: pointer to hisi lpc device
+ * @para: some parameters used to control the lpc I/O operations
+ * @ptaddr: the lpc I/O target port address
+ * @buf: where the read back data is stored
+ * @opcnt: how many I/O operations required in this calling
+ *
+ * Only one byte data is read each I/O operation.
+ *
+ * Returns 0 on success, non-zero on fail.
+ *
+ */
+static int
+hisilpc_target_in(struct hisilpc_dev *lpcdev, struct lpc_cycle_para *para,
+		  unsigned long ptaddr, unsigned char *buf,
+		  unsigned long opcnt)
+{
+	unsigned long cnt_per_trans;
+	unsigned int cmd_word;
+	unsigned int waitcnt;
+	int ret;
+
+	if (!buf || !opcnt || !para || !para->csize || !lpcdev)
+		return -EINVAL;
+
+	if (opcnt  > LPC_MAX_OPCNT)
+		return -EINVAL;
+
+	cmd_word = LPC_CMD_TYPE_IO | LPC_CMD_READ;
+	waitcnt = LPC_PEROP_WAITCNT;
+	if (!(para->opflags & FG_INCRADDR_LPC)) {
+		cmd_word |= LPC_CMD_SAMEADDR;
+		waitcnt = LPC_MAX_WAITCNT;
+	}
+
+	ret = 0;
+	cnt_per_trans = (para->csize == 1) ? opcnt : para->csize;
+	for (; opcnt && !ret; cnt_per_trans = para->csize) {
+		unsigned long flags;
+
+		/* whole operation must be atomic */
+		spin_lock_irqsave(&lpcdev->cycle_lock, flags);
+
+		writel(cnt_per_trans, lpcdev->membase + LPC_REG_OP_LEN);
+
+		writel(cmd_word, lpcdev->membase + LPC_REG_CMD);
+
+		writel(ptaddr, lpcdev->membase + LPC_REG_ADDR);
+
+		writel(START_WORK, lpcdev->membase + LPC_REG_START);
+
+		/* whether the operation is finished */
+		ret = wait_lpc_idle(lpcdev->membase, waitcnt);
+		if (!ret) {
+			opcnt -= cnt_per_trans;
+			for (; cnt_per_trans--; buf++)
+				*buf = readl(lpcdev->membase + LPC_REG_RDATA);
+		}
+
+		spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);
+	}
+
+	return ret;
+}
+
+/**
+ * hisilpc_target_out - trigger a series of lpc cycles to write required
+ *			data to target peripheral.
+ * @pdev: pointer to hisi lpc device
+ * @para: some parameters used to control the lpc I/O operations
+ * @ptaddr: the lpc I/O target port address
+ * @buf: where the data to be written is stored
+ * @opcnt: how many I/O operations required
+ *
+ * Only one byte data is read each I/O operation.
+ *
+ * Returns 0 on success, non-zero on fail.
+ *
+ */
+static int
+hisilpc_target_out(struct hisilpc_dev *lpcdev, struct lpc_cycle_para *para,
+		   unsigned long ptaddr, const unsigned char *buf,
+		   unsigned long opcnt)
+{
+	unsigned long cnt_per_trans;
+	unsigned int cmd_word;
+	unsigned int waitcnt;
+	int ret;
+
+	if (!buf || !opcnt || !para || !lpcdev)
+		return -EINVAL;
+
+	if (opcnt > LPC_MAX_OPCNT)
+		return -EINVAL;
+	/* default is increasing address */
+	cmd_word = LPC_CMD_TYPE_IO | LPC_CMD_WRITE;
+	waitcnt = LPC_PEROP_WAITCNT;
+	if (!(para->opflags & FG_INCRADDR_LPC)) {
+		cmd_word |= LPC_CMD_SAMEADDR;
+		waitcnt = LPC_MAX_WAITCNT;
+	}
+
+	ret = 0;
+	cnt_per_trans = (para->csize == 1) ? opcnt : para->csize;
+	for (; opcnt && !ret; cnt_per_trans = para->csize) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&lpcdev->cycle_lock, flags);
+
+		writel(cnt_per_trans, lpcdev->membase + LPC_REG_OP_LEN);
+		opcnt -= cnt_per_trans;
+		for (; cnt_per_trans--; buf++)
+			writel(*buf, lpcdev->membase + LPC_REG_WDATA);
+
+		writel(cmd_word, lpcdev->membase + LPC_REG_CMD);
+
+		writel(ptaddr, lpcdev->membase + LPC_REG_ADDR);
+
+		writel(START_WORK, lpcdev->membase + LPC_REG_START);
+
+		/* whether the operation is finished */
+		ret = wait_lpc_idle(lpcdev->membase, waitcnt);
+
+		spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);
+	}
+
+	return ret;
+}
+
+static inline unsigned long
+hisi_lpc_pio_to_addr(struct hisilpc_dev *lpcdev, unsigned long pio)
+{
+	return pio - lpcdev->extio->io_start + lpcdev->extio->bus_start;
+}
+
+
+/**
+ * hisilpc_comm_in - read/input the data from the I/O peripheral
+ *		     through LPC.
+ * @devobj: pointer to the device information relevant to LPC controller.
+ * @pio: the target I/O port address.
+ * @dlen: the data length required to read from the target I/O port.
+ *
+ * when succeed, the data read back is stored in buffer pointed by inbuf.
+ * For inb, return the data read from I/O or -1 when error occur.
+ */
+static u64 hisilpc_comm_in(void *devobj, unsigned long pio, size_t dlen)
+{
+	struct hisilpc_dev *lpcdev = devobj;
+	struct lpc_cycle_para iopara;
+	u32 rd_data;
+	unsigned char *newbuf;
+	int ret = 0;
+	unsigned long ptaddr;
+
+	if (!lpcdev || !dlen || dlen > LPC_MAX_DULEN ||	(dlen & (dlen - 1)))
+		return -1;
+
+	/* the local buffer must be enough for one data unit */
+	if (sizeof(rd_data) < dlen)
+		return -1;
+
+	newbuf = (unsigned char *)&rd_data;
+
+	ptaddr = hisi_lpc_pio_to_addr(lpcdev, pio);
+
+	iopara.opflags = FG_INCRADDR_LPC;
+	iopara.csize = dlen;
+
+	ret = hisilpc_target_in(lpcdev, &iopara, ptaddr, newbuf, dlen);
+	if (ret)
+		return -1;
+
+	return le32_to_cpu(rd_data);
+}
+
+/**
+ * hisilpc_comm_out - output the data whose maximum length is four bytes
+		      to the I/O peripheral through the LPC host.
+ * @devobj: pointer to the device information relevant to LPC controller.
+ * @outval: a value to be outputted from caller, maximum is four bytes.
+ * @pio: the target I/O port address.
+ * @dlen: the data length required writing to the target I/O port.
+ *
+ * This function is corresponding to out(b,w,l) only
+ *
+ */
+static void hisilpc_comm_out(void *devobj, unsigned long pio,
+			     u32 outval, size_t dlen)
+{
+	struct hisilpc_dev *lpcdev = devobj;
+	struct lpc_cycle_para iopara;
+	const unsigned char *newbuf;
+	unsigned long ptaddr;
+
+	if (!lpcdev || !dlen || dlen > LPC_MAX_DULEN)
+		return;
+
+	if (sizeof(outval) < dlen)
+		return;
+
+	outval = cpu_to_le32(outval);
+
+	newbuf = (const unsigned char *)&outval;
+
+	ptaddr = hisi_lpc_pio_to_addr(lpcdev, pio);
+
+	iopara.opflags = FG_INCRADDR_LPC;
+	iopara.csize = dlen;
+
+	hisilpc_target_out(lpcdev, &iopara, ptaddr, newbuf, dlen);
+}
+
+/*
+ * hisilpc_comm_ins - read/input the data in buffer to the I/O
+ *		peripheral through LPC, it corresponds to ins(b,w,l)
+ * @devobj: pointer to the device information relevant to LPC controller.
+ * @pio: the target I/O port address.
+ * @inbuf: a buffer where read/input data bytes are stored.
+ * @dlen: the data length required writing to the target I/O port.
+ * @count: how many data units whose length is dlen will be read.
+ *
+ */
+static u64
+hisilpc_comm_ins(void *devobj, unsigned long pio, void *inbuf,
+		 size_t dlen, unsigned int count)
+{
+	struct hisilpc_dev *lpcdev = devobj;
+	struct lpc_cycle_para iopara;
+	unsigned char *newbuf;
+	unsigned int loopcnt, cntleft;
+	unsigned int max_perburst;
+	unsigned long ptaddr;
+
+	if (!lpcdev || !inbuf || !count || !dlen ||
+			dlen > LPC_MAX_DULEN || (dlen & (dlen - 1)))
+		return -1;
+
+	iopara.opflags = 0;
+	if (dlen > 1)
+		iopara.opflags |= FG_INCRADDR_LPC;
+	iopara.csize = dlen;
+
+	ptaddr = hisi_lpc_pio_to_addr(lpcdev, pio);
+	newbuf = (unsigned char *)inbuf;
+	/*
+	 * ensure data stream whose length is multiple of dlen to be processed
+	 * each IO input
+	 */
+	max_perburst = LPC_MAX_OPCNT & (~(dlen - 1));
+	cntleft = count * dlen;
+	do {
+		int ret;
+
+		loopcnt = (cntleft >= max_perburst) ? max_perburst : cntleft;
+		ret = hisilpc_target_in(lpcdev, &iopara, ptaddr,
+					newbuf, loopcnt);
+		if (ret)
+			return ret;
+		newbuf += loopcnt;
+		cntleft -= loopcnt;
+	} while (cntleft);
+
+	return 0;
+}
+
+/*
+ * hisilpc_comm_outs - write/output the data in buffer to the I/O
+ *		peripheral through LPC, it corresponds to outs(b,w,l)
+ * @devobj: pointer to the device information relevant to LPC controller.
+ * @pio: the target I/O port address.
+ * @outbuf: a buffer where write/output data bytes are stored.
+ * @dlen: the data length required writing to the target I/O port .
+ * @count: how many data units whose length is dlen will be written.
+ *
+ */
+static void
+hisilpc_comm_outs(void *devobj, unsigned long pio, const void *outbuf,
+		  size_t dlen, unsigned int count)
+{
+	struct hisilpc_dev *lpcdev = devobj;
+	struct lpc_cycle_para iopara;
+	const unsigned char *newbuf;
+	unsigned int loopcnt, cntleft;
+	unsigned int max_perburst;
+	unsigned long ptaddr;
+
+	if (!lpcdev || !outbuf || !count || !dlen ||
+			dlen > LPC_MAX_DULEN || (dlen & (dlen - 1)))
+		return;
+
+	iopara.opflags = 0;
+	if (dlen > 1)
+		iopara.opflags |= FG_INCRADDR_LPC;
+	iopara.csize = dlen;
+
+	ptaddr = hisi_lpc_pio_to_addr(lpcdev, pio);
+	newbuf = (unsigned char *)outbuf;
+	/*
+	 * ensure data stream whose length is multiple of dlen to be processed
+	 * each IO input
+	 */
+	max_perburst = LPC_MAX_OPCNT & (~(dlen - 1));
+	cntleft = count * dlen;
+	do {
+		loopcnt = (cntleft >= max_perburst) ? max_perburst : cntleft;
+		if (hisilpc_target_out(lpcdev, &iopara, ptaddr, newbuf,
+						loopcnt))
+			break;
+		newbuf += loopcnt;
+		cntleft -= loopcnt;
+	} while (cntleft);
+}
+
+static struct extio_ops hisi_lpc_ops = {
+	.pfin = hisilpc_comm_in,
+	.pfout = hisilpc_comm_out,
+	.pfins = hisilpc_comm_ins,
+	.pfouts = hisilpc_comm_outs,
+};
+
+/**
+ * hisilpc_probe - the probe callback function for hisi lpc device,
+ *		   will finish all the initialization.
+ * @pdev: the platform device corresponding to hisi lpc
+ *
+ * Returns 0 on success, non-zero on fail.
+ *
+ */
+static int hisilpc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct hisilpc_dev *lpcdev;
+	int ret = 0;
+
+	dev_info(dev, "probing...\n");
+
+	lpcdev = devm_kzalloc(dev, sizeof(struct hisilpc_dev), GFP_KERNEL);
+	if (!lpcdev)
+		return -ENOMEM;
+
+	spin_lock_init(&lpcdev->cycle_lock);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(dev, "no MEM resource\n");
+		return -ENODEV;
+	}
+
+	lpcdev->membase = devm_ioremap_resource(dev, res);
+	if (IS_ERR(lpcdev->membase)) {
+		dev_err(dev, "remap failed\n");
+		return PTR_ERR(lpcdev->membase);
+	}
+
+	/* get the linux virtual IO node registered before. */
+	lpcdev->extio = extio_find_node(dev->fwnode);
+	if (!lpcdev->extio) {
+		dev_err(dev, "No extio node registered!\n");
+		return -EFAULT;
+	}
+
+	lpcdev->extio->devpara = lpcdev;
+	lpcdev->extio->ops = &hisi_lpc_ops;
+
+	platform_set_drvdata(pdev, lpcdev);
+
+	/*
+	 * The children scanning is only for dts. For ACPI children, the
+	 * corresponding devices had be created during ACPI scanning.
+	 */
+	if (!has_acpi_companion(dev)) {
+		ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
+		if (ret)
+			dev_err(dev, "OF: enumerate LPC bus fail(%d)\n", ret);
+	}
+
+	if (!ret)
+		dev_info(dev, "hslpc end probing. range[0x%lx - %lx]\n",
+			 lpcdev->extio->io_start,
+			 lpcdev->extio->io_start + lpcdev->extio->range_size);
+	else
+		dev_info(dev, "hslpc probing is fail(%d)\n", ret);
+
+	return ret;
+}
+
+static const struct of_device_id hisilpc_of_match[] = {
+	{ .compatible = "hisilicon,hip06-lpc", },
+	{ .compatible = "hisilicon,hip07-lpc", },
+	{},
+};
+
+static const struct acpi_device_id hisilpc_acpi_match[] = {
+	{"HISI0191", },
+	{},
+};
+
+static struct platform_driver hisilpc_driver = {
+	.driver = {
+		.name           = "hisi_lpc",
+		.of_match_table = hisilpc_of_match,
+		.acpi_match_table = hisilpc_acpi_match,
+	},
+	.probe = hisilpc_probe,
+};
+
+
+builtin_platform_driver(hisilpc_driver);
+
+/*
+ * hisilpc_bus_platform_notify -- notify callback function specific for
+ *			hisi-lpc bus. Here, will register linux virtual
+ *			PIO for the bus detected, then the bus children
+ *			can translate their bus-local IO to linux PIO.
+ */
+static int hisilpc_bus_platform_notify(struct notifier_block *nb,
+			unsigned long action, void *data)
+{
+	struct extio_node *io_node;
+	struct device *dev = data;
+	int ret;
+
+	if (!is_of_node(dev->fwnode) && !is_acpi_node(dev->fwnode))
+		return NOTIFY_DONE;
+
+	if (action != BUS_NOTIFY_ADD_DEVICE)
+		return NOTIFY_DONE;
+
+	/* whether the device notified is hisi-lpc? */
+	if (has_acpi_companion(dev)) {
+		if (!acpi_match_device(hisilpc_acpi_match, dev))
+			return NOTIFY_DONE;
+	} else {
+		if (!of_match_node(hisilpc_of_match, dev->of_node))
+			return NOTIFY_DONE;
+	}
+
+	/*
+	 * indirectIO bus was detected, time to request the linux virtual
+	 * IO.
+	 */
+	io_node = kzalloc(sizeof(*io_node), GFP_KERNEL);
+	if (!io_node)
+		return NOTIFY_DONE;
+
+	io_node->bus_start = LPC_MIN_BUS_RANGE;
+	io_node->range_size = LPC_BUS_IO_SIZE;
+
+	ret = pci_register_io_range(dev->fwnode, IO_RANGE_IOEXT,
+			io_node->range_size, &io_node->io_start);
+	if (ret) {
+		dev_err(dev, "register indirectIO range FAIL!\n");
+		kfree(io_node);
+		return NOTIFY_DONE;
+	}
+	io_node->fwnode = dev->fwnode;
+	/* register the linux virtual IO range node to list. */
+	register_extio(io_node);
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block hisilpc_preinit_nb = {
+	.notifier_call = hisilpc_bus_platform_notify,
+};
+
+static int __init hisilpc_init(void)
+{
+	return bus_register_notifier(&platform_bus_type, &hisilpc_preinit_nb);
+}
+
+/* This initial funtion must be called before the platform bus scanning. */
+arch_initcall(hisilpc_init);
-- 
1.9.1

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