[PATCH v7 2/2] misc: Add iop driver for Sunplus SP7021
From: Tony Huang
Date: Mon Jan 10 2022 - 01:38:01 EST
IOP(8051) embedded inside SP7021 which is used as
Processor for I/O control, monitor RTC interrupt and
cooperation with CPU & PMC in power management purpose.
The IOP core is DQ8051, so also named IOP8051,
it supports dedicated JTAG debug pins which share with SP7021.
In standby mode operation, the power spec reach 400uA.
Signed-off-by: Tony Huang <tonyhuang.sunplus@xxxxxxxxx>
---
Changes in v7:
- Addressed comments from Greg KH.
Documentation/ABI/testing/sysfs-platform-soc@B | 28 ++
MAINTAINERS | 2 +
drivers/misc/sunplus_iop.c | 455 +++++++++++++++++++++++++
3 files changed, 485 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-platform-soc@B
create mode 100644 drivers/misc/sunplus_iop.c
diff --git a/Documentation/ABI/testing/sysfs-platform-soc@B b/Documentation/ABI/testing/sysfs-platform-soc@B
new file mode 100644
index 0000000..1946a6f
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-soc@B
@@ -0,0 +1,28 @@
+What: /sys/devices/platform/soc@B/9c000400.iop/sp_iop_mailbox
+Date: January 2022
+KernelVersion: 5.16
+Contact: Tony Huang <tonyhuang.sunplus@xxxxxxxxx>
+Description:
+ Show IOP's mailbox0 register data.
+ Format: %x
+
+What: /sys/devices/platform/soc@B/9c000400.iop/sp_iop_mode
+Date: January 2022
+KernelVersion: 5.16
+Contact: Tony Huang <tonyhuang.sunplus@xxxxxxxxx>
+Description:
+ Read-Write.
+
+ Write this file.
+ Operation mode of IOP is switched to standby mode by writing
+ "1" to sysfs.
+ Operation mode of IOP is switched to normal mode by writing
+ "0" to sysfs.
+ Writing of other values is invalid.
+
+ Read this file.
+ Show operation mode of IOP. "0" is normal mode. "1" is standby
+ mode.
+ Format: %x
+
+
diff --git a/MAINTAINERS b/MAINTAINERS
index 6f336c9..cbc8dff 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18245,7 +18245,9 @@ F: drivers/net/ethernet/dlink/sundance.c
SUNPLUS IOP DRIVER
M: Tony Huang <tonyhuang.sunplus@xxxxxxxxx>
S: Maintained
+F: Documentation/ABI/testing/sysfs-platform-soc@B
F: Documentation/devicetree/bindings/misc/sunplu-iop.yaml
+F: drivers/misc/sunplus_iop.c
SUPERH
M: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/misc/sunplus_iop.c b/drivers/misc/sunplus_iop.c
new file mode 100644
index 0000000..c27875d
--- /dev/null
+++ b/drivers/misc/sunplus_iop.c
@@ -0,0 +1,455 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * The IOP driver for Sunplus SP7021
+ *
+ * Copyright (C) 2021 Sunplus Technology Inc.
+ *
+ * All Rights Reserved.
+ */
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/firmware.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/miscdevice.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/of_gpio.h>
+
+enum IOP_Status_e {
+ IOP_SUCCESS, /* successful */
+ IOP_ERR_IOP_BUSY, /* IOP is busy */
+};
+
+/* moon0 register offset */
+#define IOP_CLKEN0 0x04
+#define IOP_RESET0 0x54
+
+/* IOP register offset */
+#define IOP_CONTROL 0x00
+#define IOP_DATA0 0x20
+#define IOP_DATA1 0x24
+#define IOP_DATA2 0x28
+#define IOP_DATA3 0x2c
+#define IOP_DATA4 0x30
+#define IOP_DATA5 0x34
+#define IOP_DATA6 0x38
+#define IOP_DATA7 0x3c
+#define IOP_DATA8 0x40
+#define IOP_DATA9 0x44
+#define IOP_DATA10 0x48
+#define IOP_DATA11 0x4c
+#define IOP_BASE_ADR_L 0x50
+#define IOP_BASE_ADR_H 0x54
+
+/* PMC register offset */
+#define IOP_PMC_TIMER 0x00
+#define IOP_PMC_CTRL 0x04
+#define IOP_XTAL27M_PASSWORD_I 0x08
+#define IOP_XTAL27M_PASSWORD_II 0x0c
+#define IOP_XTAL32K_PASSWORD_I 0x10
+#define IOP_XTAL32K_PASSWORD_II 0x14
+#define IOP_CLK27M_PASSWORD_I 0x18
+#define IOP_CLK27M_PASSWORD_II 0x1c
+#define IOP_PMC_TIMER2 0x20
+
+#define NORMAL_CODE_MAX_SIZE 0X1000 /* Max size of normal.bin that can be received */
+#define STANDBY_CODE_MAX_SIZE 0x4000 /* Max size of standby.bin that can be received */
+struct sp_iop {
+ struct miscdevice dev;
+ struct mutex write_lock; /* avoid parallel access */
+ void __iomem *iop_regs;
+ void __iomem *pmc_regs;
+ void __iomem *moon0_regs;
+ int irq;
+ int gpio_wakeup;
+ unsigned char iop_normal_code[NORMAL_CODE_MAX_SIZE];
+ unsigned char iop_standby_code[STANDBY_CODE_MAX_SIZE];
+ resource_size_t iop_mem_start;
+ resource_size_t iop_mem_size;
+ unsigned char bin_code_mode;
+};
+
+static void sp_iop_normal_mode(struct sp_iop *iop)
+{
+ void __iomem *iop_kernel_base;
+ unsigned int reg;
+
+ iop_kernel_base = ioremap(iop->iop_mem_start, NORMAL_CODE_MAX_SIZE);
+ memset(iop_kernel_base, 0, NORMAL_CODE_MAX_SIZE);
+ memcpy(iop_kernel_base, iop->iop_normal_code, NORMAL_CODE_MAX_SIZE);
+
+ writel(0x00100010, iop->moon0_regs + IOP_CLKEN0);
+
+ reg = readl(iop->iop_regs + IOP_CONTROL);
+ reg |= 0x01;
+ writel(reg, iop->iop_regs + IOP_CONTROL);
+
+ reg = readl(iop->iop_regs + IOP_CONTROL);
+ reg &= ~(0x8000);
+ writel(reg, iop->iop_regs + IOP_CONTROL);
+
+ reg = readl(iop->iop_regs + IOP_CONTROL);
+ reg |= 0x0200;// disable watchdog event reset IOP
+ writel(reg, iop->iop_regs + IOP_CONTROL);
+
+ reg = (iop->iop_mem_start & 0xFFFF);
+ writel(reg, iop->iop_regs + IOP_BASE_ADR_L);
+ reg = (iop->iop_mem_start >> 16);
+ writel(reg, iop->iop_regs + IOP_BASE_ADR_H);
+
+ reg = readl(iop->iop_regs + IOP_CONTROL);
+ reg &= ~(0x01);
+ writel(reg, iop->iop_regs + IOP_CONTROL);
+ iop->bin_code_mode = 0;
+}
+
+static void sp_iop_standby_mode(struct sp_iop *iop)
+{
+ void __iomem *iop_kernel_base;
+ unsigned long reg;
+
+ iop_kernel_base = ioremap(iop->iop_mem_start, STANDBY_CODE_MAX_SIZE);
+ memset(iop_kernel_base, 0, STANDBY_CODE_MAX_SIZE);
+ memcpy(iop_kernel_base, iop->iop_standby_code, STANDBY_CODE_MAX_SIZE);
+
+ writel(0x00100010, iop->moon0_regs + IOP_CLKEN0);
+
+ reg = readl(iop->iop_regs + IOP_CONTROL);
+ reg |= 0x01;
+ writel(reg, iop->iop_regs + IOP_CONTROL);
+
+ reg = readl(iop->iop_regs + IOP_CONTROL);
+ reg &= ~(0x8000);
+ writel(reg, iop->iop_regs + IOP_CONTROL);
+
+ reg = readl(iop->iop_regs + IOP_CONTROL);
+ reg |= 0x0200;// disable watchdog event reset IOP
+ writel(reg, iop->iop_regs + IOP_CONTROL);
+
+ reg = (iop->iop_mem_start & 0xFFFF);
+ writel(reg, iop->iop_regs + IOP_BASE_ADR_L);
+ reg = (iop->iop_mem_start >> 16);
+ writel(reg, iop->iop_regs + IOP_BASE_ADR_H);
+
+ reg = readl(iop->iop_regs + IOP_CONTROL);
+ reg &= ~(0x01);
+ writel(reg, iop->iop_regs + IOP_CONTROL);
+ iop->bin_code_mode = 1;
+}
+
+/* 8051 informs linux kerenl. 8051 has been switched to standby.bin code. */
+#define IOP_READY 0x0004
+#define RISC_READY 0x0008
+
+/* System linux kernel tells 8051 which gpio pin to wake-up through. */
+#define WAKEUP_PIN 0xFE02
+
+/* System linux kernel tells 8051 to execute S1 or S3 mode. */
+#define S1 0x5331
+#define S3 0x5333
+
+static int sp_iop_s3mode(struct device *dev, struct sp_iop *iop)
+{
+ unsigned int reg;
+ int ret, value;
+
+ /* PMC set */
+ writel(0x00010001, iop->pmc_regs + IOP_PMC_TIMER);
+ reg = readl(iop->pmc_regs + IOP_PMC_CTRL);
+ /* disable system reset PMC, enalbe power down IOP Domain, enable gating clock 27Mhz */
+ reg |= 0x23;
+ writel(reg, iop->pmc_regs + IOP_PMC_CTRL);
+
+ writel(0x55aa00ff, iop->pmc_regs + IOP_XTAL27M_PASSWORD_I);
+ writel(0x00ff55aa, iop->pmc_regs + IOP_XTAL27M_PASSWORD_II);
+ writel(0xaa00ff55, iop->pmc_regs + IOP_XTAL32K_PASSWORD_I);
+ writel(0xff55aa00, iop->pmc_regs + IOP_XTAL32K_PASSWORD_II);
+ writel(0xaaff0055, iop->pmc_regs + IOP_CLK27M_PASSWORD_I);
+ writel(0x5500aaff, iop->pmc_regs + IOP_CLK27M_PASSWORD_II);
+ writel(0x01000100, iop->pmc_regs + IOP_PMC_TIMER2);
+
+ /* IOP Hardware IP reset */
+ reg = readl(iop->moon0_regs + IOP_RESET0);
+ reg |= 0x10;
+ writel(reg, (iop->moon0_regs + IOP_RESET0));
+ reg &= ~(0x10);
+ writel(reg, (iop->moon0_regs + IOP_RESET0));
+
+ writel(0x00ff0085, (iop->moon0_regs + 32 * 4 * 1 + 4 * 1));
+
+ reg = readl(iop->moon0_regs + 32 * 4 * 1 + 4 * 2);
+ reg |= 0x08000800;
+ writel(reg, (iop->moon0_regs + 32 * 4 * 1 + 4 * 2));
+
+ writel(WAKEUP_PIN, iop->iop_regs + IOP_DATA0);
+ writel(iop->gpio_wakeup, iop->iop_regs + IOP_DATA1);
+
+ ret = readl_poll_timeout(iop->iop_regs + IOP_DATA2, value,
+ (value & IOP_READY) == IOP_READY, 1000, 10000);
+ if (ret) {
+ dev_err(dev, "timed out\n");
+ return ret;
+ }
+
+ reg = RISC_READY;
+ writel(reg, iop->iop_regs + IOP_DATA2);
+ reg = 0x0000;
+ writel(reg, iop->iop_regs + IOP_DATA5);
+ reg = 0x0060;
+ writel(reg, iop->iop_regs + IOP_DATA6);
+
+ ret = readl_poll_timeout(iop->iop_regs + IOP_DATA7, value,
+ value == 0xaaaa, 1000, 10000);
+ if (ret) {
+ dev_err(dev, "timed out\n");
+ return ret;
+ }
+
+ /* 8051 bin file call Ultra low function. */
+ writel(0xdd, iop->iop_regs + IOP_DATA1);
+ /*
+ * When the execution is here, the system linux kernel
+ * is about to be powered off
+ * The purpose of mdelay(10): Do not let the system linux
+ * kernel continue to run other programs.
+ */
+ mdelay(10);
+ return 0;
+}
+
+static int sp_iop_s1mode(struct device *dev, struct sp_iop *iop)
+{
+ int ret, value;
+
+ ret = readl_poll_timeout(iop->iop_regs + IOP_DATA2, value,
+ (value & IOP_READY) == IOP_READY, 1000, 10000);
+ if (ret) {
+ dev_err(dev, "timed out\n");
+ return ret;
+ }
+
+ writel(RISC_READY, iop->iop_regs + IOP_DATA2);
+ writel(0x0000, iop->iop_regs + IOP_DATA5);
+ writel(0x0060, iop->iop_regs + IOP_DATA6);
+
+ ret = readl_poll_timeout(iop->iop_regs + IOP_DATA7, value,
+ value == 0xaaaa, 1000, 10000);
+ if (ret) {
+ dev_err(dev, "timed out\n");
+ return ret;
+ }
+
+ /* 8051 bin file call S1_mode function. */
+ writel(0xee, iop->iop_regs + IOP_DATA1);
+ /*
+ * When the execution is here, the system linux kernel
+ * is about to be powered off
+ * The purpose of mdelay(10): Do not let the system linux
+ * kernel continue to run other programs.
+ */
+ mdelay(10);
+ return 0;
+}
+
+static ssize_t sp_iop_mailbox_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct sp_iop *iop = dev_get_drvdata(dev);
+ unsigned int mailbox;
+
+ mailbox = readl(iop->iop_regs + IOP_DATA0);
+ return sysfs_emit(buf, "%x\n", mailbox);
+}
+
+static ssize_t sp_iop_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct sp_iop *iop = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%x\n", iop->bin_code_mode);
+}
+
+static ssize_t sp_iop_mode_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct sp_iop *iop = dev_get_drvdata(dev);
+
+ if (sysfs_streq(buf, "0"))
+ sp_iop_normal_mode(iop);
+ else if (sysfs_streq(buf, "1"))
+ sp_iop_standby_mode(iop);
+ else
+ return -EINVAL;
+ return count;
+}
+
+static DEVICE_ATTR_RO(sp_iop_mailbox);
+static DEVICE_ATTR_RW(sp_iop_mode);
+
+static int sp_iop_get_normal_code(struct device *dev, struct sp_iop *iop)
+{
+ const struct firmware *fw;
+ static const char file[] = "normal.bin";
+ unsigned int err, i;
+
+ err = request_firmware(&fw, file, dev);
+ if (err) {
+ dev_err(dev, "get bin file error\n");
+ return err;
+ }
+
+ for (i = 0; i < NORMAL_CODE_MAX_SIZE; i++) {
+ char temp;
+
+ temp = fw->data[i];
+ iop->iop_normal_code[i] = temp;
+ }
+ release_firmware(fw);
+ return err;
+}
+
+static int sp_iop_get_standby_code(struct device *dev, struct sp_iop *iop)
+{
+ const struct firmware *fw;
+ static const char file[] = "standby.bin";
+ unsigned int err, i;
+
+ err = request_firmware(&fw, file, dev);
+ if (err) {
+ dev_err(dev, "get bin file error\n");
+ return err;
+ }
+
+ for (i = 0; i < STANDBY_CODE_MAX_SIZE; i++) {
+ char temp;
+
+ temp = fw->data[i];
+ iop->iop_standby_code[i] = temp;
+ }
+ release_firmware(fw);
+ return err;
+}
+
+static int sp_iop_get_resources(struct platform_device *pdev, struct sp_iop *p_sp_iop_info)
+{
+ struct resource *r;
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iop");
+ p_sp_iop_info->iop_regs = devm_ioremap_resource(&pdev->dev, r);
+ if (IS_ERR(p_sp_iop_info->iop_regs)) {
+ dev_err(&pdev->dev, "ioremap fail\n");
+ return PTR_ERR(p_sp_iop_info->iop_regs);
+ }
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iop_pmc");
+ p_sp_iop_info->pmc_regs = devm_ioremap_resource(&pdev->dev, r);
+ if (IS_ERR(p_sp_iop_info->pmc_regs)) {
+ dev_err(&pdev->dev, "ioremap fail\n");
+ return PTR_ERR(p_sp_iop_info->pmc_regs);
+ }
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "moon0");
+ p_sp_iop_info->moon0_regs = devm_ioremap_resource(&pdev->dev, r);
+ if (IS_ERR(p_sp_iop_info->moon0_regs)) {
+ dev_err(&pdev->dev, "ioremap fail\n");
+ return PTR_ERR(p_sp_iop_info->moon0_regs);
+ }
+ return IOP_SUCCESS;
+}
+
+static int sp_iop_platform_driver_probe(struct platform_device *pdev)
+{
+ int ret = -ENXIO;
+ int rc;
+ struct sp_iop *iop;
+ struct device_node *memnp;
+ struct resource mem_res;
+
+ iop = devm_kzalloc(&pdev->dev, sizeof(struct sp_iop), GFP_KERNEL);
+ if (!iop) {
+ ret = -ENOMEM;
+ goto fail_kmalloc;
+ }
+ /* init */
+ mutex_init(&iop->write_lock);
+ ret = sp_iop_get_resources(pdev, iop);
+
+ // Get reserve address
+ memnp = of_parse_phandle(pdev->dev.of_node, "memory-region", 0);
+ if (!memnp) {
+ dev_err(&pdev->dev, "no memory-region node\n");
+ return -EINVAL;
+ }
+
+ rc = of_address_to_resource(memnp, 0, &mem_res);
+ of_node_put(memnp);
+ if (rc) {
+ dev_err(&pdev->dev, "failed to translate memory-region to a resource\n");
+ return -EINVAL;
+ }
+
+ iop->iop_mem_start = mem_res.start;
+ iop->iop_mem_size = resource_size(&mem_res);
+
+ ret = sp_iop_get_normal_code(&pdev->dev, iop);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "get normal code err=%d\n", ret);
+ return ret;
+ }
+
+ ret = sp_iop_get_standby_code(&pdev->dev, iop);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "get standby code err=%d\n", ret);
+ return ret;
+ }
+
+ sp_iop_normal_mode(iop);
+ platform_set_drvdata(pdev, iop);
+ device_create_file(&pdev->dev, &dev_attr_sp_iop_mailbox);
+ device_create_file(&pdev->dev, &dev_attr_sp_iop_mode);
+ iop->gpio_wakeup = of_get_named_gpio(pdev->dev.of_node, "iop-wakeup", 0);
+ return 0;
+
+fail_kmalloc:
+ return ret;
+}
+
+static void sp_iop_platform_driver_shutdown(struct platform_device *pdev)
+{
+ struct sp_iop *iop = platform_get_drvdata(pdev);
+ unsigned int ret, value;
+
+ value = readl(iop->iop_regs + IOP_DATA11);
+ sp_iop_standby_mode(iop);
+
+ ret = readl_poll_timeout(iop->iop_regs + IOP_DATA0, value,
+ value == 0x2222, 1000, 100000);
+ if (ret)
+ dev_warn(&pdev->dev, "timed out\n");
+
+ if (value == S1)
+ sp_iop_s1mode(&pdev->dev, iop);
+ else
+ sp_iop_s3mode(&pdev->dev, iop);
+}
+
+static const struct of_device_id sp_iop_of_match[] = {
+ { .compatible = "sunplus,sp7021-iop" },
+ { /* sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, sp_iop_of_match);
+
+static struct platform_driver sp_iop_platform_driver = {
+ .probe = sp_iop_platform_driver_probe,
+ .shutdown = sp_iop_platform_driver_shutdown,
+ .driver = {
+ .name = "sunplus,sp7021-iop",
+ .of_match_table = sp_iop_of_match,
+ }
+};
+
+module_platform_driver(sp_iop_platform_driver);
+
+MODULE_AUTHOR("Tony Huang <tonyhuang.sunplus@xxxxxxxxx>");
+MODULE_DESCRIPTION("Sunplus IOP Driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4