Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame^] | 1 | Upstream-Status: Pending[Not submitted to upstream yet] |
| 2 | Signed-off-by: Emekcan Aras <emekcan.aras@arm.com> |
| 3 | |
| 4 | From 97509e82b51c57935fc8e918b33c09c4f6648ed7 Mon Sep 17 00:00:00 2001 |
| 5 | From: Emekcan <emekcan.aras@arm.com> |
| 6 | Date: Fri, 19 Aug 2022 14:51:08 +0100 |
| 7 | Subject: [PATCH] Add external system driver |
| 8 | |
| 9 | Adds external system driver to control it |
| 10 | from user-space. It provides run and reset |
| 11 | functionality at the moment. |
| 12 | |
| 13 | Signed-off-by: Emekcan Aras <emekcan.aras@arm.com> |
| 14 | --- |
| 15 | drivers/misc/Kconfig | 2 + |
| 16 | drivers/misc/Makefile | 1 + |
| 17 | drivers/misc/arm/Kconfig | 5 ++ |
| 18 | drivers/misc/arm/Makefile | 1 + |
| 19 | drivers/misc/arm/extsys_ctrl.c | 151 +++++++++++++++++++++++++++++++++ |
| 20 | 5 files changed, 160 insertions(+) |
| 21 | create mode 100644 drivers/misc/arm/Kconfig |
| 22 | create mode 100644 drivers/misc/arm/Makefile |
| 23 | create mode 100644 drivers/misc/arm/extsys_ctrl.c |
| 24 | |
| 25 | diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig |
| 26 | index 0f5a49fc7c9e..5ca195110b3f 100644 |
| 27 | --- a/drivers/misc/Kconfig |
| 28 | +++ b/drivers/misc/Kconfig |
| 29 | @@ -487,4 +487,6 @@ source "drivers/misc/cardreader/Kconfig" |
| 30 | source "drivers/misc/habanalabs/Kconfig" |
| 31 | source "drivers/misc/uacce/Kconfig" |
| 32 | source "drivers/misc/pvpanic/Kconfig" |
| 33 | +source "drivers/misc/arm/Kconfig" |
| 34 | + |
| 35 | endmenu |
| 36 | diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile |
| 37 | index a086197af544..f5c1bd5747f7 100644 |
| 38 | --- a/drivers/misc/Makefile |
| 39 | +++ b/drivers/misc/Makefile |
| 40 | @@ -59,3 +59,4 @@ obj-$(CONFIG_UACCE) += uacce/ |
| 41 | obj-$(CONFIG_XILINX_SDFEC) += xilinx_sdfec.o |
| 42 | obj-$(CONFIG_HISI_HIKEY_USB) += hisi_hikey_usb.o |
| 43 | obj-$(CONFIG_HI6421V600_IRQ) += hi6421v600-irq.o |
| 44 | +obj-y += arm/ |
| 45 | diff --git a/drivers/misc/arm/Kconfig b/drivers/misc/arm/Kconfig |
| 46 | new file mode 100644 |
| 47 | index 000000000000..3c4b3f08e6b4 |
| 48 | --- /dev/null |
| 49 | +++ b/drivers/misc/arm/Kconfig |
| 50 | @@ -0,0 +1,5 @@ |
| 51 | +config EXTSYS_CTRL |
| 52 | + tristate "Arm External System control driver" |
| 53 | + help |
| 54 | + Say y here to enable support for external system control |
| 55 | + driver for the Arm Corstone-700 and Corstone1000 platform |
| 56 | \ No newline at end of file |
| 57 | diff --git a/drivers/misc/arm/Makefile b/drivers/misc/arm/Makefile |
| 58 | new file mode 100644 |
| 59 | index 000000000000..1ca3084cf8a0 |
| 60 | --- /dev/null |
| 61 | +++ b/drivers/misc/arm/Makefile |
| 62 | @@ -0,0 +1 @@ |
| 63 | +obj-$(CONFIG_EXTSYS_CTRL) += extsys_ctrl.o |
| 64 | diff --git a/drivers/misc/arm/extsys_ctrl.c b/drivers/misc/arm/extsys_ctrl.c |
| 65 | new file mode 100644 |
| 66 | index 000000000000..1c6ef14a32ae |
| 67 | --- /dev/null |
| 68 | +++ b/drivers/misc/arm/extsys_ctrl.c |
| 69 | @@ -0,0 +1,151 @@ |
| 70 | +// SPDX-License-Identifier: GPL-2.0 |
| 71 | +/* |
| 72 | + * Arm Corstone700 and Corstone1000 external system reset control driver |
| 73 | + * |
| 74 | + * Copyright (C) 2019 Arm Ltd. |
| 75 | + * |
| 76 | + */ |
| 77 | + |
| 78 | +#include <linux/fs.h> |
| 79 | +#include <linux/clk.h> |
| 80 | +#include <linux/err.h> |
| 81 | +#include <linux/interrupt.h> |
| 82 | +#include <linux/io.h> |
| 83 | +#include <linux/kernel.h> |
| 84 | +#include <linux/mod_devicetable.h> |
| 85 | +#include <linux/module.h> |
| 86 | +#include <linux/platform_device.h> |
| 87 | +#include <linux/miscdevice.h> |
| 88 | +#include <linux/init.h> |
| 89 | + |
| 90 | +#define EXTSYS_DRV_NAME "extsys_ctrl" |
| 91 | +#define EXTSYS_MAX_DEVS 4 |
| 92 | + |
| 93 | +#define EXTSYS_RST_SIZE U(0x8) |
| 94 | +#define EXTSYS_RST_CTRL_OFF U(0x0) |
| 95 | +#define EXTSYS_RST_ST_OFF U(0x4) |
| 96 | + |
| 97 | +/* External system reset control indexes */ |
| 98 | +#define EXTSYS_CPU_WAIT (0x0) |
| 99 | +#define EXTSYS_RST_REQ (0x1) |
| 100 | + |
| 101 | +/* External system reset status masks */ |
| 102 | +#define EXTSYS_RST_ST_ACK_OFF U(0x1) |
| 103 | + |
| 104 | +/* No Reset Requested */ |
| 105 | +#define EXTSYS_RST_ST_ACK_NRR (0x0 << EXTSYS_RST_ST_ACK_OFF) |
| 106 | + |
| 107 | +/* Reset Request Complete */ |
| 108 | +#define EXTSYS_RST_ST_ACK_RRC (0x2 << EXTSYS_RST_ST_ACK_OFF) |
| 109 | + |
| 110 | +/* Reset Request Unable to Complete */ |
| 111 | +#define EXTSYS_RST_ST_ACK_RRUC (0x3 << EXTSYS_RST_ST_ACK_OFF) |
| 112 | + |
| 113 | +/* IOCTL commands */ |
| 114 | +#define EXTSYS_CPU_WAIT_DISABLE 0x0 |
| 115 | +#define EXTSYS_RESET_REQ_ENABLE 0x1 |
| 116 | + |
| 117 | +struct extsys_ctrl { |
| 118 | + struct miscdevice miscdev; |
| 119 | + void __iomem *reset_reg; |
| 120 | + void __iomem *set_reg; |
| 121 | +}; |
| 122 | + |
| 123 | +#define CLEAR_BIT(addr, index) writel(readl(addr) & ~(1UL << index), addr) |
| 124 | +#define SET_BIT(addr, index) writel(readl(addr) | (1UL << index), addr) |
| 125 | + |
| 126 | +static long extsys_ctrl_ioctl(struct file *f, unsigned int cmd, |
| 127 | + unsigned long arg) |
| 128 | +{ |
| 129 | + struct extsys_ctrl *extsys; |
| 130 | + |
| 131 | + extsys = container_of(f->private_data, struct extsys_ctrl, miscdev); |
| 132 | + |
| 133 | + switch (cmd) { |
| 134 | + case EXTSYS_CPU_WAIT_DISABLE: |
| 135 | + CLEAR_BIT(extsys->reset_reg, EXTSYS_CPU_WAIT); |
| 136 | + break; |
| 137 | + case EXTSYS_RESET_REQ_ENABLE: |
| 138 | + SET_BIT(extsys->reset_reg, EXTSYS_RST_REQ); |
| 139 | + break; |
| 140 | + default: |
| 141 | + break; |
| 142 | + } |
| 143 | + |
| 144 | + return 0; |
| 145 | +} |
| 146 | + |
| 147 | +static const struct file_operations extsys_ctrl_fops = { |
| 148 | + .owner = THIS_MODULE, |
| 149 | + .unlocked_ioctl = extsys_ctrl_ioctl, |
| 150 | +}; |
| 151 | + |
| 152 | +static int extsys_ctrl_probe(struct platform_device *pdev) |
| 153 | +{ |
| 154 | + struct device *dev = &pdev->dev; |
| 155 | + struct extsys_ctrl *extsys; |
| 156 | + struct resource *res; |
| 157 | + void __iomem *reset_reg; |
| 158 | + void __iomem *set_reg; |
| 159 | + int ret; |
| 160 | + |
| 161 | + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rstreg"); |
| 162 | + reset_reg = devm_ioremap_resource(dev, res); |
| 163 | + if (IS_ERR(reset_reg)) |
| 164 | + return PTR_ERR(reset_reg); |
| 165 | + |
| 166 | + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "streg"); |
| 167 | + set_reg = devm_ioremap_resource(dev, res); |
| 168 | + if (IS_ERR(set_reg)) |
| 169 | + return PTR_ERR(set_reg); |
| 170 | + |
| 171 | + extsys = devm_kzalloc(dev, sizeof(*extsys), GFP_KERNEL); |
| 172 | + if (!extsys) |
| 173 | + return -ENOMEM; |
| 174 | + |
| 175 | + extsys->reset_reg = reset_reg; |
| 176 | + extsys->set_reg = set_reg; |
| 177 | + |
| 178 | + extsys->miscdev.minor = MISC_DYNAMIC_MINOR; |
| 179 | + extsys->miscdev.name = EXTSYS_DRV_NAME; |
| 180 | + extsys->miscdev.fops = &extsys_ctrl_fops; |
| 181 | + extsys->miscdev.parent = dev; |
| 182 | + |
| 183 | + ret = misc_register(&extsys->miscdev); |
| 184 | + if (ret) |
| 185 | + return ret; |
| 186 | + |
| 187 | + dev_info(dev, "external system controller ready\n"); |
| 188 | + |
| 189 | + return 0; |
| 190 | +} |
| 191 | + |
| 192 | +static int extsys_ctrl_remove(struct platform_device *pdev) |
| 193 | +{ |
| 194 | + struct extsys_ctrl *extsys = dev_get_drvdata(&pdev->dev); |
| 195 | + |
| 196 | + misc_deregister(&extsys->miscdev); |
| 197 | + |
| 198 | + return 0; |
| 199 | +} |
| 200 | + |
| 201 | +static const struct of_device_id extsys_ctrl_match[] = { |
| 202 | + { .compatible = "arm,extsys_ctrl" }, |
| 203 | + { }, |
| 204 | +}; |
| 205 | +MODULE_DEVICE_TABLE(of, extsys_ctrl_match); |
| 206 | + |
| 207 | +static struct platform_driver extsys_ctrl_driver = { |
| 208 | + .driver = { |
| 209 | + .name = EXTSYS_DRV_NAME, |
| 210 | + .of_match_table = extsys_ctrl_match, |
| 211 | + }, |
| 212 | + .probe = extsys_ctrl_probe, |
| 213 | + .remove = extsys_ctrl_remove, |
| 214 | +}; |
| 215 | +module_platform_driver(extsys_ctrl_driver); |
| 216 | + |
| 217 | +MODULE_LICENSE("GPL v2"); |
| 218 | +MODULE_DESCRIPTION("Arm External System Control Driver"); |
| 219 | +MODULE_AUTHOR("Morten Borup Petersen"); |
| 220 | +MODULE_AUTHOR("Rui Miguel Silva <rui.silva@arm.com>"); |
| 221 | -- |
| 222 | 2.17.1 |
| 223 | |