This is a core mfd driver for the on board embedded controllers found on the
Data Modul embedded CPU modules. The embedded controller may provide the
following functions: i2c bus, gpio, watchdog, uart and rtm.
Signed-off-by: Zahari Doychev <zahari.doyc...@linux.com>
---
drivers/staging/Kconfig | 2 +-
drivers/staging/Makefile | 1 +-
drivers/staging/dmec/Kconfig | 9 +-
drivers/staging/dmec/Makefile | 1 +-
drivers/staging/dmec/dmec-core.c | 500 ++++++++++++++++++++++++++++++++-
drivers/staging/dmec/dmec.h | 6 +-
6 files changed, 519 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/dmec/Kconfig
create mode 100644 drivers/staging/dmec/Makefile
create mode 100644 drivers/staging/dmec/dmec-core.c
create mode 100644 drivers/staging/dmec/dmec.h
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index 58a7b35..d95bee2 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -106,4 +106,6 @@ source "drivers/staging/greybus/Kconfig"
source "drivers/staging/vc04_services/Kconfig"
+source "drivers/staging/dmec/Kconfig"
+
endif # STAGING
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 2fa9745..73b4833 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -42,3 +42,4 @@ obj-$(CONFIG_ISDN_I4L) += i4l/
obj-$(CONFIG_KS7010) += ks7010/
obj-$(CONFIG_GREYBUS) += greybus/
obj-$(CONFIG_BCM2708_VCHIQ) += vc04_services/
+obj-$(CONFIG_MFD_DMEC) += dmec/
diff --git a/drivers/staging/dmec/Kconfig b/drivers/staging/dmec/Kconfig
new file mode 100644
index 0000000..3641907
--- /dev/null
+++ b/drivers/staging/dmec/Kconfig
@@ -0,0 +1,9 @@
+config MFD_DMEC
+ tristate "Data Modul Embedded Controller MFD"
+ select MFD_CORE
+ help
+ Say Y here to enable support for a Data Module embedded controller
+ found on Data Module CPU Modules
+
+ To compile this driver as a module, say M here: the module will be
+ called dmec
diff --git a/drivers/staging/dmec/Makefile b/drivers/staging/dmec/Makefile
new file mode 100644
index 0000000..859163b
--- /dev/null
+++ b/drivers/staging/dmec/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_MFD_DMEC) += dmec-core.o
diff --git a/drivers/staging/dmec/dmec-core.c b/drivers/staging/dmec/dmec-core.c
new file mode 100644
index 0000000..40f5481
--- /dev/null
+++ b/drivers/staging/dmec/dmec-core.c
@@ -0,0 +1,500 @@
+/*
+ * dmec-core: Data Modul AG mfd embedded controller driver
+ *
+ * Zahari Doychev <zahari.doyc...@linux.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+#include <linux/platform_device.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/dmi.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/regmap.h>
+#include <linux/acpi.h>
+#include <linux/nls.h>
+#include "dmec.h"
+
+#define DMEC_LBAR 0x00 /* Index addressing 4 bytes */
+#define DMEC_ECVER0 0x04
+#define DMEC_ECVER1 0x05
+#define DMEC_ECFTR0 0x07
+#define DMEC_ECFTR1 0x08
+#define DMEC_FPGAVER0 0x0c
+#define DMEC_FPGAVER1 0x0d
+#define DMEC_FPGABLD0 0x0e
+#define DMEC_FPGABLD1 0x0f
+#define DMEC_IRQCFG0 0x10
+#define DMEC_IRQCFG1 0x11
+#define DMEC_RTM_START 0x60
+#define DMEC_RTM_END 0x6e
+
+#define DMEC_MAX_GPIO_CHIPS 2
+
+#define DMEC_VERSION_LEN 32
+
+#define DMEC_FEATURE_BIT_I2C BIT(0)
+#define DMEC_FEATURE_BIT_WDT BIT(4)
+#define DMEC_FEATURE_BIT_GPIO (3 << 6)
+
+#define DMEC_REG_MAX 0x7f
+#define DMEC_MAX_DEVS ARRAY_SIZE(dmec_devs)
+#define DMEC_MAX_IO_RES 2
+#define DMEC_STR_SZ 128
+
+static bool i_addr;
+module_param(i_addr, bool, 0644);
+MODULE_PARM_DESC(i_addr, "Enable register index addressing usage");
+
+static const char * const fw_types[] = {"release", "custom",
+ "debug", "reserved"};
+
+enum dmec_cells {
+ DMEC_I2C = 0,
+ DMEC_GPIOA,
+ DMEC_GPIOB,
+ DMEC_WDT,
+ DMEC_RTM
+};
+
+struct dmec_features {
+ unsigned int i2c_buses:2;
+ unsigned int uarts:2;
+ unsigned int wdt:1;
+ unsigned int rsvd1:1;
+ unsigned int gpio_chips:2;
+ unsigned int spi_buses:2;
+ unsigned int can_buses:2;
+ unsigned int rsvd2:1;
+ unsigned int nmi:1;
+ unsigned int sci:1;
+ unsigned int smi:1;
+};
+
+struct dmec_info {
+ unsigned int ec_ver:4;
+ unsigned int ec_rev:4;
+ unsigned int ec_num:2;
+ unsigned int ec_type:2;
+ unsigned int ec_dbg:4;
+ u16 fpga_ver;
+ u16 fpga_bld;
+ char version[DMEC_VERSION_LEN];
+};
+
+struct dmec_device_data {
+ void __iomem *io_base;
+ void __iomem *io_index;
+ void __iomem *io_data;
+ union {
+ u16 feature_mask;
+ struct dmec_features ftr;
+ } u;
+ struct device *dev;
+ struct dmec_info info;
+ struct regmap *regmap;
+ /* use index addressing for register access if set*/
+ bool i_addr;
+};
+
+struct dmec_platform_data {
+ int (*get_info)(struct dmec_device_data *);
+ int (*register_cells)(struct dmec_device_data *);
+};
+
+static struct dmec_i2c_platform_data dmec_i2c_data = {
+ .reg_shift = 0, /* two bytes between registers */
+ .reg_io_width = 1, /* register io read/write width */
+ .clock_khz = 50000, /* input clock of 50MHz */
+};
+
+static struct dmec_gpio_platform_data dmec_gpio_pdata[DMEC_MAX_GPIO_CHIPS] = {
+ {
+ .gpio_base = -1,
+ .chip_num = 0,
+ },
+ {
+ .gpio_base = -1,
+ .chip_num = 1,
+ },
+};
+
+/* The gpio block can use up to DMEC_GPIO_MAX_IRQS APIC irqs */
+static struct resource dmec_gpio_irq_resources[DMEC_MAX_GPIO_CHIPS];
+static struct resource dmec_wdt_irq_resource;
+static struct resource dmec_i2c_irq_resource;
+
+static struct mfd_cell dmec_devs[] = {
+ [DMEC_I2C] = {
+ .name = "dmec-i2c",
+ .platform_data = &dmec_i2c_data,
+ .pdata_size = sizeof(dmec_i2c_data),
+ .resources = &dmec_i2c_irq_resource,
+ .num_resources = 1,
+ },
+ [DMEC_GPIOA] = {
+ .name = "dmec-gpio",
+ .platform_data = &dmec_gpio_pdata[0],
+ .pdata_size = sizeof(struct dmec_gpio_platform_data),
+ .resources = &dmec_gpio_irq_resources[0],
+ .num_resources = 1,
+ },
+ [DMEC_GPIOB] = {
+ .name = "dmec-gpio",
+ .platform_data = &dmec_gpio_pdata[1],
+ .pdata_size = sizeof(struct dmec_gpio_platform_data),
+ .resources = &dmec_gpio_irq_resources[1],
+ .num_resources = 1,
+ },
+ [DMEC_WDT] = {
+ .name = "dmec-wdt",
+ .resources = &dmec_wdt_irq_resource,
+ .num_resources = 1,
+ },
+ [DMEC_RTM] = {
+ .name = "dmec-rtm",
+ },
+};
+
+static void dmec_get_gpio_irqs(struct dmec_device_data *ec)
+{
+ unsigned int irq, val;
+
+ regmap_read(ec->regmap, DMEC_IRQCFG1, &val);
+ irq = (val >> 4) & 0xf;
+ dmec_gpio_irq_resources[0].start = irq;
+ dmec_gpio_irq_resources[0].end = irq;
+ dmec_gpio_irq_resources[0].flags = IORESOURCE_IRQ;
+ irq = val & 0xf;
+ dmec_gpio_irq_resources[1].start = irq;
+ dmec_gpio_irq_resources[1].end = irq;
+ dmec_gpio_irq_resources[1].flags = IORESOURCE_IRQ;
+}
+
+static void dmec_get_wdt_irq(struct dmec_device_data *ec)
+{
+ unsigned int irq, val;
+
+ regmap_read(ec->regmap, DMEC_IRQCFG0, &val);
+ irq = val & 0xf;
+ dmec_wdt_irq_resource.start = irq;
+ dmec_wdt_irq_resource.end = irq;
+ dmec_wdt_irq_resource.flags = IORESOURCE_IRQ;
+}
+
+static void dmec_get_i2c_irq(struct dmec_device_data *ec)
+{
+ unsigned int irq, val;
+
+ regmap_read(ec->regmap, DMEC_IRQCFG0, &val);
+ irq = (val >> 4) & 0xf;
+ dmec_i2c_irq_resource.start = irq;
+ dmec_i2c_irq_resource.end = irq;
+ dmec_i2c_irq_resource.flags = IORESOURCE_IRQ;
+}
+
+static int dmec_rtm_detect(struct dmec_device_data *ec)
+{
+ unsigned int val, n;
+
+ for (n = DMEC_RTM_START; n <= DMEC_RTM_END; n++) {
+ regmap_read(ec->regmap, n, &val);
+ if (val != 0xff)
+ return 1;
+ }
+
+ return 0;
+}
+
+static int dmec_register_cells(struct dmec_device_data *ec)
+{
+ struct mfd_cell cells[DMEC_MAX_DEVS];
+ u8 n_dev = 0;
+
+ if (ec->u.feature_mask & DMEC_FEATURE_BIT_I2C) {
+ dmec_get_i2c_irq(ec);
+ dmec_devs[DMEC_I2C].id = n_dev;
+ cells[n_dev++] = dmec_devs[DMEC_I2C];
+ }
+
+ if (ec->u.feature_mask & DMEC_FEATURE_BIT_GPIO) {
+ dmec_get_gpio_irqs(ec);
+ dmec_devs[DMEC_GPIOA].id = n_dev;
+ cells[n_dev++] = dmec_devs[DMEC_GPIOA];
+ if (ec->u.ftr.gpio_chips > 1) {
+ dmec_devs[DMEC_GPIOB].id = n_dev;
+ cells[n_dev++] = dmec_devs[DMEC_GPIOB];
+ }
+ }
+
+ if (ec->u.feature_mask & DMEC_FEATURE_BIT_WDT) {
+ dmec_get_wdt_irq(ec);
+ dmec_devs[DMEC_WDT].id = n_dev;
+ cells[n_dev++] = dmec_devs[DMEC_WDT];
+ }
+
+ if (dmec_rtm_detect(ec)) {
+ dmec_devs[DMEC_RTM].id = n_dev;
+ cells[n_dev++] = dmec_devs[DMEC_RTM];
+ }
+
+ return devm_mfd_add_devices(ec->dev, 0,
+ cells, n_dev, NULL, 0, NULL);
+}
+
+static int dmec_read16(struct dmec_device_data *ec, u8 reg)
+{
+ unsigned int lsb, msb;
+ int ret;
+
+ ret = regmap_read(ec->regmap, reg, &lsb);
+ ret = regmap_read(ec->regmap, reg + 0x1, &msb);
+
+ return (msb << 8) | lsb;
+}
+
+static int dmec_get_info(struct dmec_device_data *ec)
+{
+ unsigned int ver0, ver1;
+
+ regmap_read(ec->regmap, DMEC_ECVER0, &ver0);
+ regmap_read(ec->regmap, DMEC_ECVER1, &ver1);
+ if (ver0 == 0xff && ver1 == 0xff)
+ return -ENODEV;
+
+ ec->u.feature_mask = dmec_read16(ec, DMEC_ECFTR0);
+
+ ec->info.ec_ver = (ver0 >> 4) & 0xf;
+ ec->info.ec_rev = ver0 & 0xf;
+ ec->info.ec_num = ver1 & 0x3;
+ ec->info.ec_type = (ver1 >> 2) & 0x3;
+ ec->info.ec_dbg = (ver1 >> 4) & 0xf;
+
+ ec->info.fpga_ver = dmec_read16(ec, DMEC_FPGAVER0);
+ ec->info.fpga_bld = dmec_read16(ec, DMEC_FPGABLD0);
+
+ return 0;
+}
+
+static int dmec_regmap_reg_read(void *context,
+ unsigned int reg, unsigned int *val)
+{
+ struct dmec_device_data *ec = context;
+
+ if (ec->i_addr) {
+ iowrite8(reg, ec->io_index);
+ *val = ioread8(ec->io_data);
+ } else {
+ *val = ioread8(ec->io_base + reg);
+ }
+
+ return 0;
+}
+
+static int dmec_regmap_reg_write(void *context,
+ unsigned int reg, unsigned int val)
+{
+ struct dmec_device_data *ec = context;
+
+ if (ec->i_addr) {
+ iowrite8(reg, ec->io_index);
+ iowrite8(val, ec->io_data);
+ } else {
+ iowrite8(val, ec->io_base + reg);
+ }
+
+ return 0;
+}
+
+struct regmap *dmec_get_regmap(struct device *dev)
+{
+ struct dmec_device_data *ec = dev_get_drvdata(dev);
+
+ return ec->regmap;
+}
+EXPORT_SYMBOL(dmec_get_regmap);
+
+static ssize_t dmec_version_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dmec_device_data *ec = dev_get_drvdata(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%s\n", ec->info.version);
+}
+
+static ssize_t dmec_fw_type_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dmec_device_data *ec = dev_get_drvdata(dev);
+
+ return scnprintf(buf, PAGE_SIZE,
+ "ver: %u.%u\n"
+ "ec: %u\n"
+ "type: %s\n"
+ "debug: %u\n"
+ "fpga ver: %x\n"
+ "fpga build: %x\n",
+ ec->info.ec_ver,
+ ec->info.ec_rev,
+ ec->info.ec_num,
+ fw_types[ec->info.ec_type % (ARRAY_SIZE(fw_types) - 1)],
+ ec->info.ec_dbg,
+ ec->info.fpga_ver,
+ ec->info.fpga_bld);
+}
+
+static ssize_t dmec_features_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct dmec_device_data *ec = dev_get_drvdata(dev);
+ struct dmec_features *ftr = &ec->u.ftr;
+
+ return scnprintf(buf, PAGE_SIZE,
+ "i2c buses: %2u\n"
+ "uarts: %2u\n"
+ "watchdog: %2u\n"
+ "gpio chips: %2u\n"
+ "spi buses: %2u\n"
+ "can buses: %2u\n"
+ "nmi: %2u\n"
+ "sci: %2u\n"
+ "smi: %2u\n",
+ ftr->i2c_buses, ftr->uarts, ftr->wdt,
+ ftr->gpio_chips, ftr->spi_buses, ftr->can_buses,
+ ftr->nmi, ftr->sci, ftr->smi);
+}
+
+static DEVICE_ATTR(version, 0444, dmec_version_show, NULL);
+static DEVICE_ATTR(fw_type, 0444, dmec_fw_type_show, NULL);
+static DEVICE_ATTR(features, 0444, dmec_features_show, NULL);
+
+static struct attribute *dmec_attributes[] = {
+ &dev_attr_version.attr,
+ &dev_attr_fw_type.attr,
+ &dev_attr_features.attr,
+ NULL
+};
+
+static const struct attribute_group ec_attr_group = {
+ .attrs = dmec_attributes,
+};
+
+static int dmec_detect_device(struct dmec_device_data *ec)
+{
+ int ret;
+
+ ret = dmec_get_info(ec);
+ if (ret)
+ return ret;
+
+ ret = scnprintf(ec->info.version, sizeof(ec->info.version),
+ "%u.%u",
+ ec->info.ec_ver, ec->info.ec_rev);
+ if (ret < 0)
+ return ret;
+
+ dev_info(ec->dev, "v%s (%s) features: %#x\n",
+ ec->info.version,
+ fw_types[ec->info.ec_type % (ARRAY_SIZE(fw_types) - 1)],
+ ec->u.feature_mask);
+
+ ret = dmec_register_cells(ec);
+ if (ret)
+ return ret;
+
+ return sysfs_create_group(&ec->dev->kobj, &ec_attr_group);
+}
+
+static const struct regmap_config dmec_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .reg_stride = 1,
+ .max_register = DMEC_REG_MAX,
+ .reg_write = dmec_regmap_reg_write,
+ .reg_read = dmec_regmap_reg_read,
+ .cache_type = REGCACHE_NONE,
+ .fast_io = true,
+};
+
+static int dmec_mfd_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct dmec_device_data *ec;
+ struct resource *io_idx, *io;
+ int ret;
+
+ ret = platform_device_add_data(pdev, NULL, 0);
+ if (ret)
+ return ret;
+
+ ec = devm_kzalloc(dev, sizeof(*ec), GFP_KERNEL);
+ if (!ec)
+ return -ENOMEM;
+
+ io_idx = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!io_idx)
+ return -EINVAL;
+
+ io = platform_get_resource(pdev, IORESOURCE_IO, 1);
+ if (!io) {
+ dev_info(dev, "falling back to index addressing\n");
+ ec->io_base = devm_ioport_map(dev, io_idx->start,
+ io_idx->end - io_idx->start);
+ i_addr = true;
+ } else
+ ec->io_base = devm_ioport_map(dev, io->start,
+ io->end - io->start);
+
+ if (IS_ERR(ec->io_base))
+ return PTR_ERR(ec->io_base);
+
+ /* In index mode registers @ 0x0 and 0x2 are used by the BIOS */
+ ec->i_addr = i_addr;
+ ec->io_index = ec->io_base + 1;
+ ec->io_data = ec->io_base + 3;
+ ec->dev = dev;
+
+ ec->regmap = devm_regmap_init(dev, NULL, ec, &dmec_regmap_config);
+ if (IS_ERR(ec->regmap))
+ return PTR_ERR(ec->regmap);
+ regcache_cache_bypass(ec->regmap, true);
+
+ platform_set_drvdata(pdev, ec);
+
+ return dmec_detect_device(ec);
+}
+
+static int dmec_mfd_remove(struct platform_device *pdev)
+{
+ struct dmec_device_data *ec = platform_get_drvdata(pdev);
+
+ sysfs_remove_group(&ec->dev->kobj, &ec_attr_group);
+
+ return 0;
+}
+
+static const struct acpi_device_id dmec_acpi_ids[] = {
+ {"DMEC0001", 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, dmec_acpi_ids);
+
+static struct platform_driver dmec_driver = {
+ .probe = dmec_mfd_probe,
+ .remove = dmec_mfd_remove,
+ .driver = {
+ .name = "dmec",
+ .acpi_match_table = ACPI_PTR(dmec_acpi_ids)
+ },
+};
+
+module_platform_driver(dmec_driver);
+
+MODULE_DESCRIPTION("DMO embedded controller core driver");
+MODULE_AUTHOR("Zahari Doychev <zahari.doyc...@linux.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:dmec-core");
diff --git a/drivers/staging/dmec/dmec.h b/drivers/staging/dmec/dmec.h
new file mode 100644
index 0000000..4d8712d
--- /dev/null
+++ b/drivers/staging/dmec/dmec.h
@@ -0,0 +1,6 @@
+#ifndef _LINUX_MFD_DMEC_H
+#define _LINUX_MFD_DMEC_H
+
+struct regmap *dmec_get_regmap(struct device *dev);
+
+#endif
--
git-series 0.8.10
