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Subject[PATCH 1/3] mailbox: add support for APM X-Gene platform mailbox driver
Date
Add support for APM X-Gene platform mailbox driver.

Signed-off-by: Feng Kan <fkan@apm.com>
---
drivers/mailbox/Kconfig | 10 ++
drivers/mailbox/Makefile | 2 +
drivers/mailbox/mailbox-xgene-slimpro.c | 289 ++++++++++++++++++++++++++++++++
3 files changed, 301 insertions(+)
create mode 100644 drivers/mailbox/mailbox-xgene-slimpro.c

diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index 84325f2..14ceae1 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -51,4 +51,14 @@ config ALTERA_MBOX
An implementation of the Altera Mailbox soft core. It is used
to send message between processors. Say Y here if you want to use the
Altera mailbox support.
+
+config XGENE_SLIMPRO_MBOX
+ tristate "APM SoC X-Gene SLIMpro Mailbox Controller"
+ depends on ARCH_XGENE
+ help
+ An implementation of the APM X-Gene Interprocessor Communication
+ Mailbox (IPCM) between the ARM 64-bit cores and SLIMpro controller.
+ It is used to send short messages between ARM64-bit cores and
+ the SLIMpro Management Engine, primarily for PM. Say Y here if you
+ want to use the APM X-Gene SLIMpro IPCM support.
endif
diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index 2e79231..e15fcf7 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -9,3 +9,5 @@ obj-$(CONFIG_OMAP2PLUS_MBOX) += omap-mailbox.o
obj-$(CONFIG_PCC) += pcc.o

obj-$(CONFIG_ALTERA_MBOX) += mailbox-altera.o
+
+obj-$(CONFIG_XGENE_SLIMPRO_MBOX) += mailbox-xgene-slimpro.o
diff --git a/drivers/mailbox/mailbox-xgene-slimpro.c b/drivers/mailbox/mailbox-xgene-slimpro.c
new file mode 100644
index 0000000..09c619a
--- /dev/null
+++ b/drivers/mailbox/mailbox-xgene-slimpro.c
@@ -0,0 +1,289 @@
+/*
+ * APM X-Gene SLIMpro MailBox Driver
+ *
+ * Copyright (c) 2014, Applied Micro Circuits Corporation
+ * Author: Feng Kan fkan@apm.com
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/mailbox_controller.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+#define MBOX_CON_NAME "slimpro-mbox"
+#define MBOX_REG_SET_OFFSET 0x1000
+#define MBOX_CNT 8
+#define MBOX_STATUS_AVAIL_MASK 0x00010000
+#define MBOX_STATUS_ACK_MASK 0x00000001
+
+/* Configuration and Status Registers */
+struct slimpro_mbox_reg {
+ u32 in;
+ u32 din0;
+ u32 din1;
+ u32 rsvd1;
+ u32 out;
+ u32 dout0;
+ u32 dout1;
+ u32 rsvd2;
+ u32 status;
+ u32 statusmask;
+};
+
+struct slimpro_mbox_chan {
+ struct device *dev;
+ struct mbox_chan *chan;
+ struct slimpro_mbox_reg __iomem *reg;
+ int id;
+ int irq;
+ u32 rx_msg[3];
+};
+
+struct slimpro_mbox {
+ struct mbox_controller mb_ctrl;
+ struct slimpro_mbox_chan mc[MBOX_CNT];
+ struct mbox_chan chans[MBOX_CNT];
+};
+
+static struct slimpro_mbox_chan *to_slimpro_mbox_chan(struct mbox_chan *chan)
+{
+ if (!chan || !chan->con_priv)
+ return NULL;
+
+ return (struct slimpro_mbox_chan *)chan->con_priv;
+}
+
+static void mb_chan_send_msg(struct slimpro_mbox_chan *mb_chan, u32 *msg)
+{
+ writel(msg[1], &mb_chan->reg->dout0);
+ writel(msg[2], &mb_chan->reg->dout1);
+ writel(msg[0], &mb_chan->reg->out);
+}
+
+static void mb_chan_recv_msg(struct slimpro_mbox_chan *mb_chan)
+{
+ mb_chan->rx_msg[1] = readl(&mb_chan->reg->din0);
+ mb_chan->rx_msg[2] = readl(&mb_chan->reg->din1);
+ mb_chan->rx_msg[0] = readl(&mb_chan->reg->in);
+}
+
+static void mb_chan_enable_int(struct slimpro_mbox_chan *mb_chan, u32 mask)
+{
+ u32 val = readl(&mb_chan->reg->statusmask);
+
+ val &= ~mask;
+
+ writel(val, &mb_chan->reg->statusmask);
+}
+
+static void mb_chan_disable_int(struct slimpro_mbox_chan *mb_chan, u32 mask)
+{
+ u32 val = readl(&mb_chan->reg->statusmask);
+
+ val |= mask;
+
+ writel(val, &mb_chan->reg->statusmask);
+}
+
+static int mb_chan_status_ack(struct slimpro_mbox_chan *mb_chan)
+{
+ u32 val = readl(&mb_chan->reg->status);
+
+ if (val & MBOX_STATUS_ACK_MASK) {
+ writel(MBOX_STATUS_ACK_MASK, &mb_chan->reg->status);
+ return 1;
+ }
+ return 0;
+}
+
+static int mb_chan_status_avail(struct slimpro_mbox_chan *mb_chan)
+{
+ u32 val = readl(&mb_chan->reg->status);
+
+ if (val & MBOX_STATUS_AVAIL_MASK) {
+ mb_chan_recv_msg(mb_chan);
+ writel(MBOX_STATUS_AVAIL_MASK, &mb_chan->reg->status);
+ return 1;
+ }
+ return 0;
+}
+
+static irqreturn_t slimpro_mbox_irq(int irq, void *id)
+{
+ struct slimpro_mbox_chan *mb_chan = id;
+
+ if (mb_chan_status_ack(mb_chan))
+ mbox_chan_txdone(mb_chan->chan, 0);
+
+ if (mb_chan_status_avail(mb_chan)) {
+ mb_chan_recv_msg(mb_chan);
+ mbox_chan_received_data(mb_chan->chan, mb_chan->rx_msg);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int slimpro_mbox_send_data(struct mbox_chan *chan, void *msg)
+{
+ struct slimpro_mbox_chan *mb_chan = to_slimpro_mbox_chan(chan);
+
+ mb_chan_send_msg(mb_chan, msg);
+ return 0;
+}
+
+static int slimpro_mbox_startup(struct mbox_chan *chan)
+{
+ struct slimpro_mbox_chan *mb_chan = to_slimpro_mbox_chan(chan);
+ int rc;
+
+ rc = devm_request_irq(mb_chan->dev, mb_chan->irq, slimpro_mbox_irq, 0,
+ MBOX_CON_NAME, mb_chan);
+ if (unlikely(rc)) {
+ dev_err(mb_chan->dev, "failed to register mailbox interrupt %d\n",
+ mb_chan->irq);
+ return rc;
+ }
+
+ /* Enable HW interrupt */
+ writel(MBOX_STATUS_ACK_MASK | MBOX_STATUS_AVAIL_MASK,
+ &mb_chan->reg->status);
+ mb_chan_enable_int(mb_chan, MBOX_STATUS_ACK_MASK |
+ MBOX_STATUS_AVAIL_MASK);
+ return 0;
+}
+
+static void slimpro_mbox_shutdown(struct mbox_chan *chan)
+{
+ struct slimpro_mbox_chan *mb_chan = to_slimpro_mbox_chan(chan);
+
+ mb_chan_disable_int(mb_chan, MBOX_STATUS_ACK_MASK |
+ MBOX_STATUS_AVAIL_MASK);
+ devm_free_irq(mb_chan->dev, mb_chan->irq, mb_chan);
+}
+
+static struct mbox_chan_ops slimpro_mbox_ops = {
+ .send_data = slimpro_mbox_send_data,
+ .startup = slimpro_mbox_startup,
+ .shutdown = slimpro_mbox_shutdown,
+};
+
+static int __init slimpro_mbox_probe(struct platform_device *pdev)
+{
+ struct slimpro_mbox *ctx;
+ struct resource *regs;
+ void __iomem *mb_base;
+ int rc;
+ int i;
+
+ ctx = devm_kzalloc(&pdev->dev, sizeof(struct slimpro_mbox), GFP_KERNEL);
+ if (IS_ERR(ctx))
+ return PTR_ERR(ctx);
+
+ platform_set_drvdata(pdev, ctx);
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ mb_base = devm_ioremap_resource(&pdev->dev, regs);
+ if (IS_ERR(mb_base))
+ return PTR_ERR(mb_base);
+
+ /* Setup mailbox links */
+ for (i = 0; i < MBOX_CNT; i++) {
+ ctx->mc[i].irq = platform_get_irq(pdev, i);
+ if (ctx->mc[i].irq < 0) {
+ dev_err(&pdev->dev, "no IRQ at index %d\n",
+ ctx->mc[i].irq);
+ return -ENODEV;
+ }
+
+ ctx->mc[i].dev = &pdev->dev;
+ ctx->mc[i].reg = mb_base + i * MBOX_REG_SET_OFFSET;
+ ctx->mc[i].id = i;
+ ctx->mc[i].chan = &ctx->chans[i];
+ ctx->chans[i].con_priv = &ctx->mc[i];
+ }
+
+ /* Setup mailbox controller */
+ ctx->mb_ctrl.dev = &pdev->dev;
+ ctx->mb_ctrl.chans = ctx->chans;
+ ctx->mb_ctrl.txdone_irq = true;
+ ctx->mb_ctrl.ops = &slimpro_mbox_ops;
+ ctx->mb_ctrl.num_chans = MBOX_CNT;
+
+ rc = mbox_controller_register(&ctx->mb_ctrl);
+ if (rc) {
+ dev_err(&pdev->dev,
+ "APM X-Gene SLIMpro MailBox register failed:%d\n", rc);
+ return rc;
+ }
+
+ dev_info(&pdev->dev, "APM X-Gene SLIMpro MailBox registered\n");
+ return 0;
+}
+
+static int slimpro_mbox_remove(struct platform_device *pdev)
+{
+ struct slimpro_mbox *smb = platform_get_drvdata(pdev);
+
+ mbox_controller_unregister(&smb->mb_ctrl);
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id slimpro_of_match[] = {
+ {.compatible = "apm,xgene-slimpro-mbox" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, slimpro_of_match);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id slimpro_acpi_ids[] = {
+ {"APMC0D01", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, slimpro_acpi_ids);
+#endif
+
+static struct platform_driver slimpro_mbox_driver = {
+ .probe = slimpro_mbox_probe,
+ .remove = slimpro_mbox_remove,
+ .driver = {
+ .name = "xgene-slimpro-mbox",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(slimpro_of_match),
+ .acpi_match_table = ACPI_PTR(slimpro_acpi_ids)
+ },
+};
+
+static int __init slimpro_mbox_init(void)
+{
+ return platform_driver_register(&slimpro_mbox_driver);
+}
+
+static void __exit slimpro_mbox_exit(void)
+{
+}
+
+subsys_initcall(slimpro_mbox_init);
+module_exit(slimpro_mbox_exit);
+
+MODULE_DESCRIPTION("APM X-Gene SLIMpro Mailbox Driver");
+MODULE_LICENSE("GPL");
--
1.9.1


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