[PATCH] Hisilicon LPC driver
From: Rongrong Zou
Date: Mon Nov 30 2015 - 08:08:13 EST
This is the Low Pin Count driver for Hisilicon Hi1610 SoC. It is used
for LPC master accessing LPC slave device.
We only implement I/O read and I/O write here, and the 2 interfaces are
exported for uart driver and ipmi_si driver.
Signed-off-by: Rongrong Zou <zourongrong@xxxxxxxxx>
Signed-off-by: lijianhua <Jueying0518@xxxxxxxxx>
---
.../bindings/misc/hisilicon,low-pin-count.txt | 11 +
MAINTAINERS | 5 +
drivers/misc/Kconfig | 7 +
drivers/misc/Makefile | 1 +
drivers/misc/hisi_lpc.c | 292 +++++++++++++++++++++
include/linux/hisi_lpc.h | 83 ++++++
6 files changed, 399 insertions(+)
create mode 100644 Documentation/devicetree/bindings/misc/hisilicon,low-pin-count.txt
create mode 100644 drivers/misc/hisi_lpc.c
create mode 100644 include/linux/hisi_lpc.h
diff --git a/Documentation/devicetree/bindings/misc/hisilicon,low-pin-count.txt b/Documentation/devicetree/bindings/misc/hisilicon,low-pin-count.txt
new file mode 100644
index 0000000..05c1e19
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/hisilicon,low-pin-count.txt
@@ -0,0 +1,11 @@
+Hisilicon Low Pin Count bus
+
+Required properties
+- compatible: "hisilicon,low-pin-count"
+- reg specifies low pin count address range
+
+Example:
+ lpc_0: lpc@a01b0000 {
+ compatible = "hisilicon,low-pin-count";
+ ret = <0x0 0xa01b0000, 0x0, 0x10000>;
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 3f92804..352a4e2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5037,6 +5037,11 @@ F: include/uapi/linux/if_hippi.h
F: net/802/hippi.c
F: drivers/net/hippi/
+HISILICON LOW PIN COUNT DRIVER
+M: Rongrong Zou <zourongrong@xxxxxxxxxx>
+S: Maintained
+F: drivers/misc/hisi-lpc/
+
HOST AP DRIVER
M: Jouni Malinen <j@xxxxx>
L: hostap@xxxxxxxxx (subscribers-only)
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 22892c7..67f286f 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -525,6 +525,13 @@ config VEXPRESS_SYSCFG
bus. System Configuration interface is one of the possible means
of generating transactions on this bus.
+config HISI_LPC
+ bool "hisilicon Low Pin Count driver"
+ help
+ The hisilicon Low Pin Count controller can communicate with
+ device which have Low Pin Count slave controller. This driver
+ Support IO cycle only.
+
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 537d7f3..a8903f0dc 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -56,3 +56,4 @@ obj-$(CONFIG_GENWQE) += genwqe/
obj-$(CONFIG_ECHO) += echo/
obj-$(CONFIG_VEXPRESS_SYSCFG) += vexpress-syscfg.o
obj-$(CONFIG_CXL_BASE) += cxl/
+obj-$(CONFIG_HISI_LPC) += hisi_lpc.o
diff --git a/drivers/misc/hisi_lpc.c b/drivers/misc/hisi_lpc.c
new file mode 100644
index 0000000..aae9ff3
--- /dev/null
+++ b/drivers/misc/hisi_lpc.c
@@ -0,0 +1,292 @@
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/list.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/hisi_lpc.h>
+
+#define LPC_REG_READ(reg, result) ((result) = readl(reg))
+
+#define LPC_REG_WRITE(reg, data) writel((data), (reg))
+
+
+struct hs_lpc_dev *lpc_dev;
+
+int lpc_master_write(unsigned int slv_access_mode, unsigned int cycle_type,
+ unsigned int addr, unsigned char *buf, unsigned int len)
+{
+ unsigned int i;
+ unsigned int lpc_cmd_value;
+ unsigned int lpc_irq_st_value;
+ unsigned int lpc_op_state_value;
+ unsigned int retry = 0;
+
+ /* para check */
+ if (!buf)
+ return -EFAULT;
+
+ if (slv_access_mode != HS_LPC_CMD_SAMEADDR_SING &&
+ slv_access_mode != HS_LPC_CMD_SAMEADDR_INC) {
+ dev_err(lpc_dev->dev, "Slv access mode error\n");
+ return -EINVAL;
+ }
+
+ if ((cycle_type != HS_LPC_CMD_TYPE_IO) &&
+ (cycle_type != HS_LPC_CMD_TYPE_MEM) &&
+ (cycle_type != HS_LPC_CMD_TYPE_FWH)) {
+ dev_err(lpc_dev->dev, "Cycle type error\n");
+ return -EINVAL;
+ }
+
+ if (len == 0) {
+ dev_err(lpc_dev->dev, "Write length zero\n");
+ return -EINVAL;
+ }
+
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_IRQ_ST, HS_LPC_IRQ_CLEAR);
+ retry = 0;
+ while (0 == (LPC_REG_READ(lpc_dev->regs + HS_LPC_REG_OP_STATUS,
+ lpc_op_state_value) & HS_LPC_STATUS_DILE)) {
+ udelay(1);
+ retry++;
+ if (retry >= 10000) {
+ dev_err(lpc_dev->dev, "lpc W, wait idle time out\n");
+ return -ETIME;
+ }
+ }
+
+ /* set lpc master write cycle type and slv access mode */
+ lpc_cmd_value = HS_LPC_CMD_WRITE | cycle_type | slv_access_mode;
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_CMD, lpc_cmd_value);
+
+ /* set lpc op len */
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_OP_LEN, len);
+
+ /* Set write data */
+ for (i = 0; i < len; i++)
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_WDATA, buf[i]);
+
+ /* set lpc addr config */
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_ADDR, addr);
+
+ /* set lpc start work */
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_START, START_WORK);
+
+ retry = 0;
+ while ((LPC_REG_READ(lpc_dev->regs + HS_LPC_REG_IRQ_ST,
+ lpc_irq_st_value) & HS_LPC_IRQ_OCCURRED) == 0) {
+ udelay(1);
+ retry++;
+ if (retry >= 10000) {
+ dev_err(lpc_dev->dev, "lpc write, time out\n");
+ return -ETIME;
+ }
+ }
+
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_IRQ_ST, HS_LPC_IRQ_CLEAR);
+
+ if ((LPC_REG_READ(lpc_dev->regs + HS_LPC_REG_OP_STATUS,
+ lpc_op_state_value) & HS_LPC_OP_FINISHED) == HS_LPC_OP_FINISHED) {
+ return 0;
+ }
+
+ dev_err(lpc_dev->dev, "Lpc master write failed, op_result : 0x%x\n",
+ lpc_op_state_value);
+ return -1;
+}
+
+void lpc_io_write_byte(u8 value, unsigned long addr)
+{
+ unsigned long flags;
+ int ret;
+
+ if (!lpc_dev) {
+ pr_err("device is not register\n!");
+ return;
+ }
+ spin_lock_irqsave(&lpc_dev->lock, flags);
+ ret = lpc_master_write(HS_LPC_CMD_SAMEADDR_SING, HS_LPC_CMD_TYPE_IO,
+ addr, &value, 1);
+ spin_unlock_irqrestore(&lpc_dev->lock, flags);
+}
+EXPORT_SYMBOL(lpc_io_write_byte);
+
+int lpc_master_read(unsigned int slv_access_mode, unsigned int cycle_type,
+ unsigned int addr, unsigned char *buf, unsigned int len)
+{
+ unsigned int i;
+ unsigned int lpc_cmd_value;
+ unsigned int lpc_irq_st_value;
+ unsigned int lpc_rdata_value;
+ unsigned int lpc_op_state_value;
+ unsigned int retry = 0;
+
+ /* para check */
+ if (!buf)
+ return -EFAULT;
+
+ if (slv_access_mode != HS_LPC_CMD_SAMEADDR_SING &&
+ slv_access_mode != HS_LPC_CMD_SAMEADDR_INC) {
+ dev_err(lpc_dev->dev, "Slv access mode error\n");
+ return -EINVAL;
+ }
+
+ if (cycle_type != HS_LPC_CMD_TYPE_IO &&
+ cycle_type != HS_LPC_CMD_TYPE_MEM &&
+ cycle_type != HS_LPC_CMD_TYPE_FWH) {
+ dev_err(lpc_dev->dev, "Cycle type error\n");
+ return -EINVAL;
+ }
+
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_IRQ_ST, HS_LPC_IRQ_CLEAR);
+
+ retry = 0;
+ while (0 == (LPC_REG_READ(lpc_dev->regs + HS_LPC_REG_OP_STATUS,
+ lpc_op_state_value) & HS_LPC_STATUS_DILE)) {
+ udelay(1);
+ retry++;
+ if (retry >= 10000) {
+ dev_err(lpc_dev->dev, "lpc read,wait idl timeout\n");
+ return -ETIME;
+ }
+ }
+
+ /* set lpc master read cycle type and slv access mode */
+ lpc_cmd_value = HS_LPC_CMD_READ | cycle_type | slv_access_mode;
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_CMD, lpc_cmd_value);
+
+ /* set lpc op len */
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_OP_LEN, len);
+
+ /* set lpc addr config */
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_ADDR, addr);
+
+ /* set lpc start work */
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_START, START_WORK);
+
+ while ((LPC_REG_READ(lpc_dev->regs + HS_LPC_REG_IRQ_ST,
+ lpc_irq_st_value) & HS_LPC_IRQ_OCCURRED) == 0) {
+ udelay(1);
+ retry++;
+ if (retry >= 10000) {
+ dev_err(lpc_dev->dev, "lpc read, time out\n");
+ return -ETIME;
+ }
+ }
+
+ LPC_REG_WRITE(lpc_dev->regs + HS_LPC_REG_IRQ_ST, HS_LPC_IRQ_CLEAR);
+
+ /* Get read data */
+ if ((LPC_REG_READ(lpc_dev->regs + HS_LPC_REG_OP_STATUS,
+ lpc_op_state_value) & HS_LPC_OP_FINISHED) == HS_LPC_OP_FINISHED) {
+ for (i = 0; i < len; i++) {
+ LPC_REG_READ(lpc_dev->regs + HS_LPC_REG_RDATA,
+ lpc_rdata_value);
+ buf[i] = lpc_rdata_value;
+ }
+ return 0;
+ }
+
+ dev_err(lpc_dev->dev, "Lpc master read failed, op_result : 0x%x\n",
+ lpc_op_state_value);
+
+ return -1;
+}
+
+u8 lpc_io_read_byte(unsigned long addr)
+{
+ unsigned char value;
+ unsigned long flags;
+
+ if (!lpc_dev) {
+ pr_err("device is not register!\n");
+ return 0;
+ }
+
+ spin_lock_irqsave(&lpc_dev->lock, flags);
+ lpc_master_read(HS_LPC_CMD_SAMEADDR_SING,
+ HS_LPC_CMD_TYPE_IO, addr, &value, 1);
+ spin_unlock_irqrestore(&lpc_dev->lock, flags);
+ return value;
+}
+EXPORT_SYMBOL(lpc_io_read_byte);
+
+static int hs_lpc_probe(struct platform_device *pdev)
+{
+ struct resource *regs = NULL;
+
+ if (!pdev->dev.of_node) {
+ dev_err(&pdev->dev, "Device OF-Node is NULL\n");
+ return -EFAULT;
+ }
+
+ lpc_dev = devm_kzalloc(&pdev->dev,
+ sizeof(struct hs_lpc_dev), GFP_KERNEL);
+ if (!lpc_dev)
+ return -ENOMEM;
+
+ spin_lock_init(&lpc_dev->lock);
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ lpc_dev->regs = devm_ioremap_resource(&pdev->dev, regs);
+ if (IS_ERR(lpc_dev->regs))
+ return PTR_ERR(lpc_dev->regs);
+
+ dev_info(&pdev->dev, "hisi low pin count initialized successfully\n");
+
+ lpc_dev->dev = &pdev->dev;
+ platform_set_drvdata(pdev, lpc_dev);
+
+ return 0;
+}
+
+static int hs_lpc_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static const struct of_device_id hs_lpc_pltfm_match[] = {
+ {
+ .compatible = "hisilicon,low-pin-count",
+ },
+ {},
+};
+
+static struct platform_driver hs_lpc_driver = {
+ .driver = {
+ .name = "hs-lpc",
+ .owner = THIS_MODULE,
+ .of_match_table = hs_lpc_pltfm_match,
+ },
+ .probe = hs_lpc_probe,
+ .remove = hs_lpc_remove,
+};
+
+static int __init hs_lpc_init_driver(void)
+{
+ return platform_driver_register(&hs_lpc_driver);
+}
+
+static void __exit hs_lpc_init_exit(void)
+{
+ platform_driver_unregister(&hs_lpc_driver);
+}
+
+arch_initcall(hs_lpc_init_driver);
+module_exit(hs_lpc_init_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Huawei Tech. Co., Ltd.");
+MODULE_DESCRIPTION("LPC driver for linux");
+MODULE_VERSION("v1.0");
diff --git a/include/linux/hisi_lpc.h b/include/linux/hisi_lpc.h
new file mode 100644
index 0000000..4cf93ee
--- /dev/null
+++ b/include/linux/hisi_lpc.h
@@ -0,0 +1,83 @@
+#ifndef __HISI_LPC_H__
+#define __HISI_LPC_H__
+
+#define HS_LPC_REG_START (0x00)
+#define HS_LPC_REG_OP_STATUS (0x04)
+#define HS_LPC_REG_IRQ_ST (0x08)
+#define HS_LPC_REG_OP_LEN (0x10)
+#define HS_LPC_REG_CMD (0x14)
+#define HS_LPC_REG_FWH_ID_MSIZE (0x18)
+#define HS_LPC_REG_ADDR (0x20)
+#define HS_LPC_REG_WDATA (0x24)
+#define HS_LPC_REG_RDATA (0x28)
+#define HS_LPC_REG_LONG_CNT (0x30)
+#define HS_LPC_REG_TX_FIFO_ST (0x50)
+#define HS_LPC_REG_RX_FIFO_ST (0x54)
+#define HS_LPC_REG_TIME_OUT (0x58)
+#define HS_LPC_REG_STRQ_CTRL0 (0x80)
+#define HS_LPC_REG_STRQ_CTRL1 (0x84)
+#define HS_LPC_REG_STRQ_INT (0x90)
+#define HS_LPC_REG_STRQ_INT_MASK (0x94)
+#define HS_LPC_REG_STRQ_STAT (0xa0)
+
+#define HS_LPC_CMD_SAMEADDR_SING (0x00000008)
+#define HS_LPC_CMD_SAMEADDR_INC (0x00000000)
+#define HS_LPC_CMD_TYPE_IO (0x00000000)
+#define HS_LPC_CMD_TYPE_MEM (0x00000002)
+#define HS_LPC_CMD_TYPE_FWH (0x00000004)
+#define HS_LPC_CMD_WRITE (0x00000001)
+#define HS_LPC_CMD_READ (0x00000000)
+
+#define HS_LPC_IRQ_CLEAR (0x02)
+#define HS_LPC_IRQ_OCCURRED (0x02)
+#define HS_LPC_STATUS_DILE (0x01)
+#define HS_LPC_OP_FINISHED (0x02)
+#define START_WORK (0x01)
+
+#define REG_OFFSET_IOMG033 0X84
+#define REG_OFFSET_IOMG035 0x8C
+#define REG_OFFSET_IOMG036 0x90
+#define REG_OFFSET_IOMG050 0xC8
+#define REG_OFFSET_IOMG049 0xC4
+#define REG_OFFSET_IOMG048 0xC0
+#define REG_OFFSET_IOMG047 0xBC
+#define REG_OFFSET_IOMG046 0xB8
+#define REG_OFFSET_IOMG045 0xB4
+
+#define REG_OFFSET_LPC_RESET 0xad8
+#define REG_OFFSET_LPC_BUS_RESET 0xae0
+#define REG_OFFSET_LPC_CLK_DIS 0x3a4
+#define REG_OFFSET_LPC_BUS_CLK_DIS 0x3ac
+#define REG_OFFSET_LPC_DE_RESET 0xadc
+#define REG_OFFSET_LPC_BUS_DE_RESET 0xae4
+#define REG_OFFSET_LPC_CLK_EN 0x3a0
+#define REG_OFFSET_LPC_BUS_CLK_EN 0x3a8
+
+#define LPC_FRAME_LEN (0x10)
+
+struct hs_lpc_dev {
+ spinlock_t lock;
+ void __iomem *regs;
+ struct device *dev;
+};
+
+#define LPC_CURR_STATUS_IDLE 0
+#define LPC_CURR_STATUS_START 1
+#define LPC_CURR_STATUS_TYPE_DIR 2
+#define LPC_CURR_STATUS_ADDR 3
+#define LPC_CURR_STATUS_MSIZE 4
+#define LPC_CURR_STATUS_WDATA 5
+#define LPC_CURR_STATUS_TARHOST 6
+#define LPC_CURR_STATUS_SYNC 7
+#define LPC_CURR_STATUS_RDATA 8
+#define LPC_CURR_STATUS_TARSLAVE 9
+#define LPC_CURR_STATUS_ABORT 10
+
+#define ALG_HCCS_SUBCTRL_BASE_ADDR (0xD0000000)
+#define REG_OFFSET_RESET_REQ 0x0AD0
+#define REG_OFFSET_RESET_DREQ 0x0AD4
+
+extern u8 lpc_io_read_byte(unsigned long addr);
+extern void lpc_io_write_byte(u8 value, unsigned long addr);
+#endif
+
--
1.9.1
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