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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/mfd/vexpress-sysreg.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/mfd/vexpress-sysreg.c')
-rw-r--r--drivers/mfd/vexpress-sysreg.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/mfd/vexpress-sysreg.c b/drivers/mfd/vexpress-sysreg.c
new file mode 100644
index 000000000..aaf24af28
--- /dev/null
+++ b/drivers/mfd/vexpress-sysreg.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ * Copyright (C) 2012 ARM Limited
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_data/syscon.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+
+#define SYS_ID 0x000
+#define SYS_SW 0x004
+#define SYS_LED 0x008
+#define SYS_100HZ 0x024
+#define SYS_FLAGSSET 0x030
+#define SYS_FLAGSCLR 0x034
+#define SYS_NVFLAGS 0x038
+#define SYS_NVFLAGSSET 0x038
+#define SYS_NVFLAGSCLR 0x03c
+#define SYS_MCI 0x048
+#define SYS_FLASH 0x04c
+#define SYS_CFGSW 0x058
+#define SYS_24MHZ 0x05c
+#define SYS_MISC 0x060
+#define SYS_DMA 0x064
+#define SYS_PROCID0 0x084
+#define SYS_PROCID1 0x088
+#define SYS_CFGDATA 0x0a0
+#define SYS_CFGCTRL 0x0a4
+#define SYS_CFGSTAT 0x0a8
+
+/* The sysreg block is just a random collection of various functions... */
+
+static struct bgpio_pdata vexpress_sysreg_sys_led_pdata = {
+ .label = "sys_led",
+ .base = -1,
+ .ngpio = 8,
+};
+
+static struct bgpio_pdata vexpress_sysreg_sys_mci_pdata = {
+ .label = "sys_mci",
+ .base = -1,
+ .ngpio = 2,
+};
+
+static struct bgpio_pdata vexpress_sysreg_sys_flash_pdata = {
+ .label = "sys_flash",
+ .base = -1,
+ .ngpio = 1,
+};
+
+static struct mfd_cell vexpress_sysreg_cells[] = {
+ {
+ .name = "basic-mmio-gpio",
+ .of_compatible = "arm,vexpress-sysreg,sys_led",
+ .num_resources = 1,
+ .resources = (struct resource []) {
+ DEFINE_RES_MEM_NAMED(SYS_LED, 0x4, "dat"),
+ },
+ .platform_data = &vexpress_sysreg_sys_led_pdata,
+ .pdata_size = sizeof(vexpress_sysreg_sys_led_pdata),
+ }, {
+ .name = "basic-mmio-gpio",
+ .of_compatible = "arm,vexpress-sysreg,sys_mci",
+ .num_resources = 1,
+ .resources = (struct resource []) {
+ DEFINE_RES_MEM_NAMED(SYS_MCI, 0x4, "dat"),
+ },
+ .platform_data = &vexpress_sysreg_sys_mci_pdata,
+ .pdata_size = sizeof(vexpress_sysreg_sys_mci_pdata),
+ }, {
+ .name = "basic-mmio-gpio",
+ .of_compatible = "arm,vexpress-sysreg,sys_flash",
+ .num_resources = 1,
+ .resources = (struct resource []) {
+ DEFINE_RES_MEM_NAMED(SYS_FLASH, 0x4, "dat"),
+ },
+ .platform_data = &vexpress_sysreg_sys_flash_pdata,
+ .pdata_size = sizeof(vexpress_sysreg_sys_flash_pdata),
+ }, {
+ .name = "vexpress-syscfg",
+ .num_resources = 1,
+ .resources = (struct resource []) {
+ DEFINE_RES_MEM(SYS_MISC, 0x4c),
+ },
+ }
+};
+
+static int vexpress_sysreg_probe(struct platform_device *pdev)
+{
+ struct resource *mem;
+ void __iomem *base;
+ struct gpio_chip *mmc_gpio_chip;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem)
+ return -EINVAL;
+
+ base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
+ if (!base)
+ return -ENOMEM;
+
+ /*
+ * Duplicated SYS_MCI pseudo-GPIO controller for compatibility with
+ * older trees using sysreg node for MMC control lines.
+ */
+ mmc_gpio_chip = devm_kzalloc(&pdev->dev, sizeof(*mmc_gpio_chip),
+ GFP_KERNEL);
+ if (!mmc_gpio_chip)
+ return -ENOMEM;
+ bgpio_init(mmc_gpio_chip, &pdev->dev, 0x4, base + SYS_MCI,
+ NULL, NULL, NULL, NULL, 0);
+ mmc_gpio_chip->ngpio = 2;
+ devm_gpiochip_add_data(&pdev->dev, mmc_gpio_chip, NULL);
+
+ return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
+ vexpress_sysreg_cells,
+ ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL);
+}
+
+static const struct of_device_id vexpress_sysreg_match[] = {
+ { .compatible = "arm,vexpress-sysreg", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, vexpress_sysreg_match);
+
+static struct platform_driver vexpress_sysreg_driver = {
+ .driver = {
+ .name = "vexpress-sysreg",
+ .of_match_table = vexpress_sysreg_match,
+ },
+ .probe = vexpress_sysreg_probe,
+};
+
+module_platform_driver(vexpress_sysreg_driver);
+MODULE_LICENSE("GPL v2");