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author | Jassi Brar <jaswinder.singh@linaro.org> | 2014-06-26 19:09:42 +0530 |
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committer | Jassi Brar <jaswinder.singh@linaro.org> | 2015-03-17 11:12:01 +0530 |
commit | ee23d66af9219dfe2407a9b08ef9a165dbe6f994 (patch) | |
tree | 5091f3e2b8eb928c982ec1af7593804372956fbe | |
parent | 33350e6b1833b15cf9c9c4c84d8534ad68b0c7b8 (diff) | |
download | op-kernel-dev-ee23d66af9219dfe2407a9b08ef9a165dbe6f994.zip op-kernel-dev-ee23d66af9219dfe2407a9b08ef9a165dbe6f994.tar.gz |
mailbox: arm_mhu: add driver for ARM MHU controller
Add driver for the ARM Primecell Message-Handling-Unit(MHU) controller.
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Andy Green <andy.green@linaro.org>
Signed-off-by: Vincent Yang <vincent.yang@socionext.com>
Signed-off-by: Tetsuya Nuriya <nuriya.tetsuya@socionext.com>
-rw-r--r-- | Documentation/devicetree/bindings/mailbox/arm-mhu.txt | 43 | ||||
-rw-r--r-- | drivers/mailbox/Kconfig | 9 | ||||
-rw-r--r-- | drivers/mailbox/Makefile | 2 | ||||
-rw-r--r-- | drivers/mailbox/arm_mhu.c | 195 |
4 files changed, 249 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mailbox/arm-mhu.txt b/Documentation/devicetree/bindings/mailbox/arm-mhu.txt new file mode 100644 index 0000000..4971f03 --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/arm-mhu.txt @@ -0,0 +1,43 @@ +ARM MHU Mailbox Driver +====================== + +The ARM's Message-Handling-Unit (MHU) is a mailbox controller that has +3 independent channels/links to communicate with remote processor(s). + MHU links are hardwired on a platform. A link raises interrupt for any +received data. However, there is no specified way of knowing if the sent +data has been read by the remote. This driver assumes the sender polls +STAT register and the remote clears it after having read the data. +The last channel is specified to be a 'Secure' resource, hence can't be +used by Linux running NS. + +Mailbox Device Node: +==================== + +Required properties: +-------------------- +- compatible: Shall be "arm,mhu" & "arm,primecell" +- reg: Contains the mailbox register address range (base + address and length) +- #mbox-cells Shall be 1 - the index of the channel needed. +- interrupts: Contains the interrupt information corresponding to + each of the 3 links of MHU. + +Example: +-------- + + mhu: mailbox@2b1f0000 { + #mbox-cells = <1>; + compatible = "arm,mhu", "arm,primecell"; + reg = <0 0x2b1f0000 0x1000>; + interrupts = <0 36 4>, /* LP-NonSecure */ + <0 35 4>, /* HP-NonSecure */ + <0 37 4>; /* Secure */ + clocks = <&clock 0 2 1>; + clock-names = "apb_pclk"; + }; + + mhu_client: scb@2e000000 { + compatible = "fujitsu,mb86s70-scb-1.0"; + reg = <0 0x2e000000 0x4000>; + mboxes = <&mhu 1>; /* HP-NonSecure */ + }; diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig index 84325f2..84b0a2d 100644 --- a/drivers/mailbox/Kconfig +++ b/drivers/mailbox/Kconfig @@ -6,6 +6,15 @@ menuconfig MAILBOX signals. Say Y if your platform supports hardware mailboxes. if MAILBOX + +config ARM_MHU + tristate "ARM MHU Mailbox" + depends on ARM_AMBA + help + Say Y here if you want to build the ARM MHU controller driver. + The controller has 3 mailbox channels, the last of which can be + used in Secure mode only. + config PL320_MBOX bool "ARM PL320 Mailbox" depends on ARM_AMBA diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile index 2e79231..b18201e 100644 --- a/drivers/mailbox/Makefile +++ b/drivers/mailbox/Makefile @@ -2,6 +2,8 @@ obj-$(CONFIG_MAILBOX) += mailbox.o +obj-$(CONFIG_ARM_MHU) += arm_mhu.o + obj-$(CONFIG_PL320_MBOX) += pl320-ipc.o obj-$(CONFIG_OMAP2PLUS_MBOX) += omap-mailbox.o diff --git a/drivers/mailbox/arm_mhu.c b/drivers/mailbox/arm_mhu.c new file mode 100644 index 0000000..ac693c6 --- /dev/null +++ b/drivers/mailbox/arm_mhu.c @@ -0,0 +1,195 @@ +/* + * Copyright (C) 2013-2015 Fujitsu Semiconductor Ltd. + * Copyright (C) 2015 Linaro Ltd. + * Author: Jassi Brar <jaswinder.singh@linaro.org> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/mutex.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/amba/bus.h> +#include <linux/mailbox_controller.h> + +#define INTR_STAT_OFS 0x0 +#define INTR_SET_OFS 0x8 +#define INTR_CLR_OFS 0x10 + +#define MHU_LP_OFFSET 0x0 +#define MHU_HP_OFFSET 0x20 +#define MHU_SEC_OFFSET 0x200 +#define TX_REG_OFFSET 0x100 + +#define MHU_CHANS 3 + +struct mhu_link { + unsigned irq; + void __iomem *tx_reg; + void __iomem *rx_reg; +}; + +struct arm_mhu { + void __iomem *base; + struct mhu_link mlink[MHU_CHANS]; + struct mbox_chan chan[MHU_CHANS]; + struct mbox_controller mbox; +}; + +static irqreturn_t mhu_rx_interrupt(int irq, void *p) +{ + struct mbox_chan *chan = p; + struct mhu_link *mlink = chan->con_priv; + u32 val; + + val = readl_relaxed(mlink->rx_reg + INTR_STAT_OFS); + if (!val) + return IRQ_NONE; + + mbox_chan_received_data(chan, (void *)&val); + + writel_relaxed(val, mlink->rx_reg + INTR_CLR_OFS); + + return IRQ_HANDLED; +} + +static bool mhu_last_tx_done(struct mbox_chan *chan) +{ + struct mhu_link *mlink = chan->con_priv; + u32 val = readl_relaxed(mlink->tx_reg + INTR_STAT_OFS); + + return (val == 0); +} + +static int mhu_send_data(struct mbox_chan *chan, void *data) +{ + struct mhu_link *mlink = chan->con_priv; + u32 *arg = data; + + writel_relaxed(*arg, mlink->tx_reg + INTR_SET_OFS); + + return 0; +} + +static int mhu_startup(struct mbox_chan *chan) +{ + struct mhu_link *mlink = chan->con_priv; + u32 val; + int ret; + + val = readl_relaxed(mlink->tx_reg + INTR_STAT_OFS); + writel_relaxed(val, mlink->tx_reg + INTR_CLR_OFS); + + ret = request_irq(mlink->irq, mhu_rx_interrupt, + IRQF_SHARED, "mhu_link", chan); + if (ret) { + dev_err(chan->mbox->dev, + "Unable to aquire IRQ %d\n", mlink->irq); + return ret; + } + + return 0; +} + +static void mhu_shutdown(struct mbox_chan *chan) +{ + struct mhu_link *mlink = chan->con_priv; + + free_irq(mlink->irq, chan); +} + +static struct mbox_chan_ops mhu_ops = { + .send_data = mhu_send_data, + .startup = mhu_startup, + .shutdown = mhu_shutdown, + .last_tx_done = mhu_last_tx_done, +}; + +static int mhu_probe(struct amba_device *adev, const struct amba_id *id) +{ + int i, err; + struct arm_mhu *mhu; + struct device *dev = &adev->dev; + int mhu_reg[MHU_CHANS] = {MHU_LP_OFFSET, MHU_HP_OFFSET, MHU_SEC_OFFSET}; + + /* Allocate memory for device */ + mhu = devm_kzalloc(dev, sizeof(*mhu), GFP_KERNEL); + if (!mhu) + return -ENOMEM; + + mhu->base = devm_ioremap_resource(dev, &adev->res); + if (IS_ERR(mhu->base)) { + dev_err(dev, "ioremap failed\n"); + return PTR_ERR(mhu->base); + } + + for (i = 0; i < MHU_CHANS; i++) { + mhu->chan[i].con_priv = &mhu->mlink[i]; + mhu->mlink[i].irq = adev->irq[i]; + mhu->mlink[i].rx_reg = mhu->base + mhu_reg[i]; + mhu->mlink[i].tx_reg = mhu->mlink[i].rx_reg + TX_REG_OFFSET; + } + + mhu->mbox.dev = dev; + mhu->mbox.chans = &mhu->chan[0]; + mhu->mbox.num_chans = MHU_CHANS; + mhu->mbox.ops = &mhu_ops; + mhu->mbox.txdone_irq = false; + mhu->mbox.txdone_poll = true; + mhu->mbox.txpoll_period = 10; + + amba_set_drvdata(adev, mhu); + + err = mbox_controller_register(&mhu->mbox); + if (err) { + dev_err(dev, "Failed to register mailboxes %d\n", err); + return err; + } + + dev_info(dev, "ARM MHU Mailbox registered\n"); + return 0; +} + +static int mhu_remove(struct amba_device *adev) +{ + struct arm_mhu *mhu = amba_get_drvdata(adev); + + mbox_controller_unregister(&mhu->mbox); + + return 0; +} + +static struct amba_id mhu_ids[] = { + { + .id = 0x1bb098, + .mask = 0xffffff, + }, + { 0, 0 }, +}; +MODULE_DEVICE_TABLE(amba, mhu_ids); + +static struct amba_driver arm_mhu_driver = { + .drv = { + .name = "mhu", + }, + .id_table = mhu_ids, + .probe = mhu_probe, + .remove = mhu_remove, +}; +module_amba_driver(arm_mhu_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("ARM MHU Driver"); +MODULE_AUTHOR("Jassi Brar <jassisinghbrar@gmail.com>"); |