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-rw-r--r--drivers/mtd/hyperbus/Kconfig23
-rw-r--r--drivers/mtd/hyperbus/Makefile4
-rw-r--r--drivers/mtd/hyperbus/hbmc-am654.c147
-rw-r--r--drivers/mtd/hyperbus/hyperbus-core.c153
4 files changed, 327 insertions, 0 deletions
diff --git a/drivers/mtd/hyperbus/Kconfig b/drivers/mtd/hyperbus/Kconfig
new file mode 100644
index 000000000000..cff6bbd226f5
--- /dev/null
+++ b/drivers/mtd/hyperbus/Kconfig
@@ -0,0 +1,23 @@
+menuconfig MTD_HYPERBUS
+ tristate "HyperBus support"
+ select MTD_CFI
+ select MTD_MAP_BANK_WIDTH_2
+ select MTD_CFI_AMDSTD
+ select MTD_COMPLEX_MAPPINGS
+ help
+ This is the framework for the HyperBus which can be used by
+ the HyperBus Controller driver to communicate with
+ HyperFlash. See Cypress HyperBus specification for more
+ details
+
+if MTD_HYPERBUS
+
+config HBMC_AM654
+ tristate "HyperBus controller driver for AM65x SoC"
+ select MULTIPLEXER
+ select MUX_MMIO
+ help
+ This is the driver for HyperBus controller on TI's AM65x and
+ other SoCs
+
+endif # MTD_HYPERBUS
diff --git a/drivers/mtd/hyperbus/Makefile b/drivers/mtd/hyperbus/Makefile
new file mode 100644
index 000000000000..8a936e066f48
--- /dev/null
+++ b/drivers/mtd/hyperbus/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_MTD_HYPERBUS) += hyperbus-core.o
+obj-$(CONFIG_HBMC_AM654) += hbmc-am654.o
diff --git a/drivers/mtd/hyperbus/hbmc-am654.c b/drivers/mtd/hyperbus/hbmc-am654.c
new file mode 100644
index 000000000000..08d543b124cd
--- /dev/null
+++ b/drivers/mtd/hyperbus/hbmc-am654.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
+// Author: Vignesh Raghavendra <vigneshr@ti.com>
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mtd/cfi.h>
+#include <linux/mtd/hyperbus.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mux/consumer.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/types.h>
+
+#define AM654_HBMC_CALIB_COUNT 25
+
+struct am654_hbmc_priv {
+ struct hyperbus_ctlr ctlr;
+ struct hyperbus_device hbdev;
+ struct mux_control *mux_ctrl;
+};
+
+static int am654_hbmc_calibrate(struct hyperbus_device *hbdev)
+{
+ struct map_info *map = &hbdev->map;
+ struct cfi_private cfi;
+ int count = AM654_HBMC_CALIB_COUNT;
+ int pass_count = 0;
+ int ret;
+
+ cfi.interleave = 1;
+ cfi.device_type = CFI_DEVICETYPE_X16;
+ cfi_send_gen_cmd(0xF0, 0, 0, map, &cfi, cfi.device_type, NULL);
+ cfi_send_gen_cmd(0x98, 0x55, 0, map, &cfi, cfi.device_type, NULL);
+
+ while (count--) {
+ ret = cfi_qry_present(map, 0, &cfi);
+ if (ret)
+ pass_count++;
+ else
+ pass_count = 0;
+ if (pass_count == 5)
+ break;
+ }
+
+ cfi_qry_mode_off(0, map, &cfi);
+
+ return ret;
+}
+
+static const struct hyperbus_ops am654_hbmc_ops = {
+ .calibrate = am654_hbmc_calibrate,
+};
+
+static int am654_hbmc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct am654_hbmc_priv *priv;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, priv);
+
+ if (of_property_read_bool(dev->of_node, "mux-controls")) {
+ struct mux_control *control = devm_mux_control_get(dev, NULL);
+
+ if (IS_ERR(control))
+ return PTR_ERR(control);
+
+ ret = mux_control_select(control, 1);
+ if (ret) {
+ dev_err(dev, "Failed to select HBMC mux\n");
+ return ret;
+ }
+ priv->mux_ctrl = control;
+ }
+
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(dev);
+ goto disable_pm;
+ }
+
+ priv->ctlr.dev = dev;
+ priv->ctlr.ops = &am654_hbmc_ops;
+ priv->hbdev.ctlr = &priv->ctlr;
+ priv->hbdev.np = of_get_next_child(dev->of_node, NULL);
+ ret = hyperbus_register_device(&priv->hbdev);
+ if (ret) {
+ dev_err(dev, "failed to register controller\n");
+ pm_runtime_put_sync(&pdev->dev);
+ goto disable_pm;
+ }
+
+ return 0;
+disable_pm:
+ pm_runtime_disable(dev);
+ if (priv->mux_ctrl)
+ mux_control_deselect(priv->mux_ctrl);
+ return ret;
+}
+
+static int am654_hbmc_remove(struct platform_device *pdev)
+{
+ struct am654_hbmc_priv *priv = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = hyperbus_unregister_device(&priv->hbdev);
+ if (priv->mux_ctrl)
+ mux_control_deselect(priv->mux_ctrl);
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ return ret;
+}
+
+static const struct of_device_id am654_hbmc_dt_ids[] = {
+ {
+ .compatible = "ti,am654-hbmc",
+ },
+ { /* end of table */ }
+};
+
+MODULE_DEVICE_TABLE(of, am654_hbmc_dt_ids);
+
+static struct platform_driver am654_hbmc_platform_driver = {
+ .probe = am654_hbmc_probe,
+ .remove = am654_hbmc_remove,
+ .driver = {
+ .name = "hbmc-am654",
+ .of_match_table = am654_hbmc_dt_ids,
+ },
+};
+
+module_platform_driver(am654_hbmc_platform_driver);
+
+MODULE_DESCRIPTION("HBMC driver for AM654 SoC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:hbmc-am654");
+MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");
diff --git a/drivers/mtd/hyperbus/hyperbus-core.c b/drivers/mtd/hyperbus/hyperbus-core.c
new file mode 100644
index 000000000000..6af9ea34117d
--- /dev/null
+++ b/drivers/mtd/hyperbus/hyperbus-core.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
+// Author: Vignesh Raghavendra <vigneshr@ti.com>
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mtd/hyperbus.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/mtd.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/types.h>
+
+static struct hyperbus_device *map_to_hbdev(struct map_info *map)
+{
+ return container_of(map, struct hyperbus_device, map);
+}
+
+static map_word hyperbus_read16(struct map_info *map, unsigned long addr)
+{
+ struct hyperbus_device *hbdev = map_to_hbdev(map);
+ struct hyperbus_ctlr *ctlr = hbdev->ctlr;
+ map_word read_data;
+
+ read_data.x[0] = ctlr->ops->read16(hbdev, addr);
+
+ return read_data;
+}
+
+static void hyperbus_write16(struct map_info *map, map_word d,
+ unsigned long addr)
+{
+ struct hyperbus_device *hbdev = map_to_hbdev(map);
+ struct hyperbus_ctlr *ctlr = hbdev->ctlr;
+
+ ctlr->ops->write16(hbdev, addr, d.x[0]);
+}
+
+static void hyperbus_copy_from(struct map_info *map, void *to,
+ unsigned long from, ssize_t len)
+{
+ struct hyperbus_device *hbdev = map_to_hbdev(map);
+ struct hyperbus_ctlr *ctlr = hbdev->ctlr;
+
+ ctlr->ops->copy_from(hbdev, to, from, len);
+}
+
+static void hyperbus_copy_to(struct map_info *map, unsigned long to,
+ const void *from, ssize_t len)
+{
+ struct hyperbus_device *hbdev = map_to_hbdev(map);
+ struct hyperbus_ctlr *ctlr = hbdev->ctlr;
+
+ ctlr->ops->copy_to(hbdev, to, from, len);
+}
+
+int hyperbus_register_device(struct hyperbus_device *hbdev)
+{
+ const struct hyperbus_ops *ops;
+ struct hyperbus_ctlr *ctlr;
+ struct device_node *np;
+ struct map_info *map;
+ struct resource res;
+ struct device *dev;
+ int ret;
+
+ if (!hbdev || !hbdev->np || !hbdev->ctlr || !hbdev->ctlr->dev) {
+ pr_err("hyperbus: please fill all the necessary fields!\n");
+ return -EINVAL;
+ }
+
+ np = hbdev->np;
+ ctlr = hbdev->ctlr;
+ if (!of_device_is_compatible(np, "cypress,hyperflash"))
+ return -ENODEV;
+
+ hbdev->memtype = HYPERFLASH;
+
+ ret = of_address_to_resource(np, 0, &res);
+ if (ret)
+ return ret;
+
+ dev = ctlr->dev;
+ map = &hbdev->map;
+ map->size = resource_size(&res);
+ map->virt = devm_ioremap_resource(dev, &res);
+ if (IS_ERR(map->virt))
+ return PTR_ERR(map->virt);
+
+ map->name = dev_name(dev);
+ map->bankwidth = 2;
+ map->device_node = np;
+
+ simple_map_init(map);
+ ops = ctlr->ops;
+ if (ops) {
+ if (ops->read16)
+ map->read = hyperbus_read16;
+ if (ops->write16)
+ map->write = hyperbus_write16;
+ if (ops->copy_to)
+ map->copy_to = hyperbus_copy_to;
+ if (ops->copy_from)
+ map->copy_from = hyperbus_copy_from;
+
+ if (ops->calibrate && !ctlr->calibrated) {
+ ret = ops->calibrate(hbdev);
+ if (!ret) {
+ dev_err(dev, "Calibration failed\n");
+ return -ENODEV;
+ }
+ ctlr->calibrated = true;
+ }
+ }
+
+ hbdev->mtd = do_map_probe("cfi_probe", map);
+ if (!hbdev->mtd) {
+ dev_err(dev, "probing of hyperbus device failed\n");
+ return -ENODEV;
+ }
+
+ hbdev->mtd->dev.parent = dev;
+ mtd_set_of_node(hbdev->mtd, np);
+
+ ret = mtd_device_register(hbdev->mtd, NULL, 0);
+ if (ret) {
+ dev_err(dev, "failed to register mtd device\n");
+ map_destroy(hbdev->mtd);
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(hyperbus_register_device);
+
+int hyperbus_unregister_device(struct hyperbus_device *hbdev)
+{
+ int ret = 0;
+
+ if (hbdev && hbdev->mtd) {
+ ret = mtd_device_unregister(hbdev->mtd);
+ map_destroy(hbdev->mtd);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(hyperbus_unregister_device);
+
+MODULE_DESCRIPTION("HyperBus Framework");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-19 01:20:57 +0300