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authorLeo Yan <leo.yan@linaro.org>2015-08-19 16:13:28 +0800
committerSumit Semwal <sumit.semwal@linaro.org>2018-01-22 20:53:31 +0530
commit2327620c9c132f9c55812b586d941de8595ef1b6 (patch)
treef2fcc4607ae9a9ba5530bad051b13167aba9f5d7
parent3697752284e89ca4113955ee45d5f0f94c48a1e4 (diff)
mailbox: Hi6220: add mailbox driver4.4.112_2-hikeylts-4.4.y-hikey
Add driver for Hi6220 mailbox, the mailbox communicates with MCU; for sending data, it can support two methods for low level implementation: one is to use interrupt as acknowledge, another is automatic mode which without any acknowledge. These two methods have been supported in the driver. For receiving data, it will depend on the interrupt to notify the channel has incoming message. Now mailbox driver is used to send message to MCU to control dynamic voltage and frequency scaling for CPU, GPU and DDR. Signed-off-by: Leo Yan <leo.yan@linaro.org> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> [pick up the Hikey mailbox driver; required for cpufreq and other drivers]
-rw-r--r--drivers/mailbox/Kconfig8
-rw-r--r--drivers/mailbox/Makefile2
-rw-r--r--drivers/mailbox/hi6220-mailbox.c371
3 files changed, 381 insertions, 0 deletions
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index 546d05f4358a..d55d656c8d5a 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -78,6 +78,14 @@ config STI_MBOX
Mailbox implementation for STMicroelectonics family chips with
hardware for interprocessor communication.
+config HI6220_MBOX
+ tristate "Hi6220 Mailbox"
+ depends on ARCH_HISI
+ help
+ An implementation of the hi6220 mailbox. It is used to send message
+ between application processors and MCU. Say Y here if you want to build
+ the Hi6220 mailbox controller driver.
+
config MAILBOX_TEST
tristate "Mailbox Test Client"
depends on OF
diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index 92435ef11f26..565adda57e52 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -17,3 +17,5 @@ obj-$(CONFIG_ALTERA_MBOX) += mailbox-altera.o
obj-$(CONFIG_BCM2835_MBOX) += bcm2835-mailbox.o
obj-$(CONFIG_STI_MBOX) += mailbox-sti.o
+
+obj-$(CONFIG_HI6220_MBOX) += hi6220-mailbox.o
diff --git a/drivers/mailbox/hi6220-mailbox.c b/drivers/mailbox/hi6220-mailbox.c
new file mode 100644
index 000000000000..c0e19d574a57
--- /dev/null
+++ b/drivers/mailbox/hi6220-mailbox.c
@@ -0,0 +1,371 @@
+/*
+ * Hisilicon's Hi6220 mailbox driver
+ *
+ * Copyright (c) 2015 Hisilicon Limited.
+ * Copyright (c) 2015 Linaro Limited.
+ *
+ * Author: Leo Yan <leo.yan@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/device.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kfifo.h>
+#include <linux/mailbox_controller.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define MBOX_CHAN_MAX 32
+#define MBOX_CHAN_NUM 2
+
+#define MBOX_RX 0x0
+#define MBOX_TX 0x1
+
+/* Mailbox message length: 8 words */
+#define MBOX_MSG_LEN 8
+
+/* Mailbox Registers */
+#define MBOX_OFF(m) (0x40 * (m))
+#define MBOX_MODE_REG(m) (MBOX_OFF(m) + 0x0)
+#define MBOX_DATA_REG(m) (MBOX_OFF(m) + 0x4)
+
+#define MBOX_STATE_MASK (0xF << 4)
+#define MBOX_STATE_IDLE (0x1 << 4)
+#define MBOX_STATE_TX (0x2 << 4)
+#define MBOX_STATE_RX (0x4 << 4)
+#define MBOX_STATE_ACK (0x8 << 4)
+#define MBOX_ACK_CONFIG_MASK (0x1 << 0)
+#define MBOX_ACK_AUTOMATIC (0x1 << 0)
+#define MBOX_ACK_IRQ (0x0 << 0)
+
+/* IPC registers */
+#define ACK_INT_RAW_REG(i) ((i) + 0x400)
+#define ACK_INT_MSK_REG(i) ((i) + 0x404)
+#define ACK_INT_STAT_REG(i) ((i) + 0x408)
+#define ACK_INT_CLR_REG(i) ((i) + 0x40c)
+#define ACK_INT_ENA_REG(i) ((i) + 0x500)
+#define ACK_INT_DIS_REG(i) ((i) + 0x504)
+#define DST_INT_RAW_REG(i) ((i) + 0x420)
+
+
+struct hi6220_mbox_chan {
+
+ /*
+ * Description for channel's hardware info:
+ * - direction: tx or rx
+ * - dst irq: peer core's irq number
+ * - ack irq: local irq number
+ * - slot number
+ */
+ unsigned int dir, dst_irq, ack_irq;
+ unsigned int slot;
+
+ struct hi6220_mbox *parent;
+};
+
+struct hi6220_mbox {
+ struct device *dev;
+
+ int irq;
+
+ /* flag of enabling tx's irq mode */
+ bool tx_irq_mode;
+
+ /* region for ipc event */
+ void __iomem *ipc;
+
+ /* region for mailbox */
+ void __iomem *base;
+
+ unsigned int chan_num;
+ struct hi6220_mbox_chan *mchan;
+
+ void *irq_map_chan[MBOX_CHAN_MAX];
+ struct mbox_chan *chan;
+ struct mbox_controller controller;
+};
+
+static void mbox_set_state(struct hi6220_mbox *mbox,
+ unsigned int slot, u32 val)
+{
+ u32 status;
+
+ status = readl(mbox->base + MBOX_MODE_REG(slot));
+ status = (status & ~MBOX_STATE_MASK) | val;
+ writel(status, mbox->base + MBOX_MODE_REG(slot));
+}
+
+static void mbox_set_mode(struct hi6220_mbox *mbox,
+ unsigned int slot, u32 val)
+{
+ u32 mode;
+
+ mode = readl(mbox->base + MBOX_MODE_REG(slot));
+ mode = (mode & ~MBOX_ACK_CONFIG_MASK) | val;
+ writel(mode, mbox->base + MBOX_MODE_REG(slot));
+}
+
+static bool hi6220_mbox_last_tx_done(struct mbox_chan *chan)
+{
+ struct hi6220_mbox_chan *mchan = chan->con_priv;
+ struct hi6220_mbox *mbox = mchan->parent;
+ u32 state;
+
+ /* Only set idle state for polling mode */
+ BUG_ON(mbox->tx_irq_mode);
+
+ state = readl(mbox->base + MBOX_MODE_REG(mchan->slot));
+ return ((state & MBOX_STATE_MASK) == MBOX_STATE_IDLE);
+}
+
+static int hi6220_mbox_send_data(struct mbox_chan *chan, void *msg)
+{
+ struct hi6220_mbox_chan *mchan = chan->con_priv;
+ struct hi6220_mbox *mbox = mchan->parent;
+ unsigned int slot = mchan->slot;
+ u32 *buf = msg;
+ int i;
+
+ mbox_set_state(mbox, slot, MBOX_STATE_TX);
+
+ if (mbox->tx_irq_mode)
+ mbox_set_mode(mbox, slot, MBOX_ACK_IRQ);
+ else
+ mbox_set_mode(mbox, slot, MBOX_ACK_AUTOMATIC);
+
+ for (i = 0; i < MBOX_MSG_LEN; i++)
+ writel(buf[i], mbox->base + MBOX_DATA_REG(slot) + i * 4);
+
+ /* trigger remote request */
+ writel(BIT(mchan->dst_irq), DST_INT_RAW_REG(mbox->ipc));
+ return 0;
+}
+
+static irqreturn_t hi6220_mbox_interrupt(int irq, void *p)
+{
+ struct hi6220_mbox *mbox = p;
+ struct hi6220_mbox_chan *mchan;
+ struct mbox_chan *chan;
+ unsigned int state, intr_bit, i;
+ u32 msg[MBOX_MSG_LEN];
+
+ state = readl(ACK_INT_STAT_REG(mbox->ipc));
+ if (!state) {
+ dev_warn(mbox->dev, "%s: spurious interrupt\n",
+ __func__);
+ return IRQ_HANDLED;
+ }
+
+ while (state) {
+ intr_bit = __ffs(state);
+ state &= (state - 1);
+
+ chan = mbox->irq_map_chan[intr_bit];
+ if (!chan) {
+ dev_warn(mbox->dev, "%s: unexpected irq vector %d\n",
+ __func__, intr_bit);
+ continue;
+ }
+
+ mchan = chan->con_priv;
+ if (mchan->dir == MBOX_TX)
+ mbox_chan_txdone(chan, 0);
+ else {
+ for (i = 0; i < MBOX_MSG_LEN; i++)
+ msg[i] = readl(mbox->base +
+ MBOX_DATA_REG(mchan->slot) + i * 4);
+
+ mbox_chan_received_data(chan, (void *)msg);
+ }
+
+ /* clear IRQ source */
+ writel(BIT(mchan->ack_irq), ACK_INT_CLR_REG(mbox->ipc));
+ mbox_set_state(mbox, mchan->slot, MBOX_STATE_IDLE);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int hi6220_mbox_startup(struct mbox_chan *chan)
+{
+ struct hi6220_mbox_chan *mchan = chan->con_priv;
+ struct hi6220_mbox *mbox = mchan->parent;
+
+ mbox->irq_map_chan[mchan->ack_irq] = (void *)chan;
+
+ /* enable interrupt */
+ writel(BIT(mchan->ack_irq), ACK_INT_ENA_REG(mbox->ipc));
+ return 0;
+}
+
+static void hi6220_mbox_shutdown(struct mbox_chan *chan)
+{
+ struct hi6220_mbox_chan *mchan = chan->con_priv;
+ struct hi6220_mbox *mbox = mchan->parent;
+
+ /* disable interrupt */
+ writel(BIT(mchan->ack_irq), ACK_INT_DIS_REG(mbox->ipc));
+ mbox->irq_map_chan[mchan->ack_irq] = NULL;
+}
+
+static struct mbox_chan_ops hi6220_mbox_chan_ops = {
+ .send_data = hi6220_mbox_send_data,
+ .startup = hi6220_mbox_startup,
+ .shutdown = hi6220_mbox_shutdown,
+ .last_tx_done = hi6220_mbox_last_tx_done,
+};
+
+static void hi6220_mbox_init_hw(struct hi6220_mbox *mbox)
+{
+ struct hi6220_mbox_chan init_data[MBOX_CHAN_NUM] = {
+ { MBOX_RX, 1, 10 },
+ { MBOX_TX, 0, 11 },
+ };
+ struct hi6220_mbox_chan *mchan = mbox->mchan;
+ int i;
+
+ for (i = 0; i < MBOX_CHAN_NUM; i++) {
+ memcpy(&mchan[i], &init_data[i], sizeof(*mchan));
+ mchan[i].slot = i;
+ mchan[i].parent = mbox;
+ }
+
+ /* mask and clear all interrupt vectors */
+ writel(0x0, ACK_INT_MSK_REG(mbox->ipc));
+ writel(~0x0, ACK_INT_CLR_REG(mbox->ipc));
+
+ /* use interrupt for tx's ack */
+ mbox->tx_irq_mode = true;
+}
+
+static const struct of_device_id hi6220_mbox_of_match[] = {
+ { .compatible = "hisilicon,hi6220-mbox", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, hi6220_mbox_of_match);
+
+static int hi6220_mbox_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct hi6220_mbox *mbox;
+ struct resource *res;
+ int i, err;
+
+ mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
+ if (!mbox)
+ return -ENOMEM;
+
+ mbox->dev = dev;
+ mbox->chan_num = MBOX_CHAN_NUM;
+ mbox->mchan = devm_kzalloc(dev,
+ mbox->chan_num * sizeof(*mbox->mchan), GFP_KERNEL);
+ if (!mbox->mchan)
+ return -ENOMEM;
+
+ mbox->chan = devm_kzalloc(dev,
+ mbox->chan_num * sizeof(*mbox->chan), GFP_KERNEL);
+ if (!mbox->chan)
+ return -ENOMEM;
+
+ mbox->irq = platform_get_irq(pdev, 0);
+ if (mbox->irq < 0)
+ return mbox->irq;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ mbox->ipc = devm_ioremap_resource(dev, res);
+ if (IS_ERR(mbox->ipc)) {
+ dev_err(dev, "ioremap ipc failed\n");
+ return PTR_ERR(mbox->ipc);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ mbox->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(mbox->base)) {
+ dev_err(dev, "ioremap buffer failed\n");
+ return PTR_ERR(mbox->base);
+ }
+
+ err = devm_request_irq(dev, mbox->irq, hi6220_mbox_interrupt, 0,
+ dev_name(dev), mbox);
+ if (err) {
+ dev_err(dev, "Failed to register a mailbox IRQ handler: %d\n",
+ err);
+ return -ENODEV;
+ }
+
+ /* init hardware parameters */
+ hi6220_mbox_init_hw(mbox);
+
+ for (i = 0; i < mbox->chan_num; i++) {
+ mbox->chan[i].con_priv = &mbox->mchan[i];
+ mbox->irq_map_chan[i] = NULL;
+ }
+
+ mbox->controller.dev = dev;
+ mbox->controller.chans = &mbox->chan[0];
+ mbox->controller.num_chans = mbox->chan_num;
+ mbox->controller.ops = &hi6220_mbox_chan_ops;
+
+ if (mbox->tx_irq_mode)
+ mbox->controller.txdone_irq = true;
+ else {
+ mbox->controller.txdone_poll = true;
+ mbox->controller.txpoll_period = 5;
+ }
+
+ err = mbox_controller_register(&mbox->controller);
+ if (err) {
+ dev_err(dev, "Failed to register mailbox %d\n", err);
+ return err;
+ }
+
+ platform_set_drvdata(pdev, mbox);
+ dev_info(dev, "Mailbox enabled\n");
+ return 0;
+}
+
+static int hi6220_mbox_remove(struct platform_device *pdev)
+{
+ struct hi6220_mbox *mbox = platform_get_drvdata(pdev);
+
+ mbox_controller_unregister(&mbox->controller);
+ return 0;
+}
+
+static struct platform_driver hi6220_mbox_driver = {
+ .driver = {
+ .name = "hi6220-mbox",
+ .owner = THIS_MODULE,
+ .of_match_table = hi6220_mbox_of_match,
+ },
+ .probe = hi6220_mbox_probe,
+ .remove = hi6220_mbox_remove,
+};
+
+static int __init hi6220_mbox_init(void)
+{
+ return platform_driver_register(&hi6220_mbox_driver);
+}
+core_initcall(hi6220_mbox_init);
+
+static void __exit hi6220_mbox_exit(void)
+{
+ platform_driver_unregister(&hi6220_mbox_driver);
+}
+module_exit(hi6220_mbox_exit);
+
+MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
+MODULE_DESCRIPTION("Hi6220 mailbox driver");
+MODULE_LICENSE("GPL v2");