mailbox: Add support for APM X-Gene platform mailbox driver
X-Gene mailbox controller provides 8 mailbox channels, with each channel has a dedicated interrupt line. Signed-off-by: Feng Kan <fkan@apm.com> Signed-off-by: Duc Dang <dhdang@apm.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Duc Dang
Jassi Brar
Родитель
1926e54f11
Коммит
f700e84f41
|
|
@ -86,4 +86,13 @@ config MAILBOX_TEST
|
|||
Test client to help with testing new Controller driver
|
||||
implementations.
|
||||
|
||||
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
|
||||
|
|
|
|||
|
|
@ -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_XGENE_SLIMPRO_MBOX) += mailbox-xgene-slimpro.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,284 @@
|
|||
/*
|
||||
* APM X-Gene SLIMpro MailBox Driver
|
||||
*
|
||||
* Copyright (c) 2015, 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 BIT(16)
|
||||
#define MBOX_STATUS_ACK_MASK BIT(0)
|
||||
|
||||
/* Configuration and Status Registers */
|
||||
#define REG_DB_IN 0x00
|
||||
#define REG_DB_DIN0 0x04
|
||||
#define REG_DB_DIN1 0x08
|
||||
#define REG_DB_OUT 0x10
|
||||
#define REG_DB_DOUT0 0x14
|
||||
#define REG_DB_DOUT1 0x18
|
||||
#define REG_DB_STAT 0x20
|
||||
#define REG_DB_STATMASK 0x24
|
||||
|
||||
/**
|
||||
* X-Gene SlimPRO mailbox channel information
|
||||
*
|
||||
* @dev: Device to which it is attached
|
||||
* @chan: Pointer to mailbox communication channel
|
||||
* @reg: Base address to access channel registers
|
||||
* @irq: Interrupt number of the channel
|
||||
* @rx_msg: Received message storage
|
||||
*/
|
||||
struct slimpro_mbox_chan {
|
||||
struct device *dev;
|
||||
struct mbox_chan *chan;
|
||||
void __iomem *reg;
|
||||
int irq;
|
||||
u32 rx_msg[3];
|
||||
};
|
||||
|
||||
/**
|
||||
* X-Gene SlimPRO Mailbox controller data
|
||||
*
|
||||
* X-Gene SlimPRO Mailbox controller has 8 commnunication channels.
|
||||
* Each channel has a separate IRQ number assgined to it.
|
||||
*
|
||||
* @mb_ctrl: Representation of the commnunication channel controller
|
||||
* @mc: Array of SlimPRO mailbox channels of the controller
|
||||
* @chans: Array of mailbox communication channels
|
||||
*
|
||||
*/
|
||||
struct slimpro_mbox {
|
||||
struct mbox_controller mb_ctrl;
|
||||
struct slimpro_mbox_chan mc[MBOX_CNT];
|
||||
struct mbox_chan chans[MBOX_CNT];
|
||||
};
|
||||
|
||||
static void mb_chan_send_msg(struct slimpro_mbox_chan *mb_chan, u32 *msg)
|
||||
{
|
||||
writel(msg[1], mb_chan->reg + REG_DB_DOUT0);
|
||||
writel(msg[2], mb_chan->reg + REG_DB_DOUT1);
|
||||
writel(msg[0], mb_chan->reg + REG_DB_OUT);
|
||||
}
|
||||
|
||||
static void mb_chan_recv_msg(struct slimpro_mbox_chan *mb_chan)
|
||||
{
|
||||
mb_chan->rx_msg[1] = readl(mb_chan->reg + REG_DB_DIN0);
|
||||
mb_chan->rx_msg[2] = readl(mb_chan->reg + REG_DB_DIN1);
|
||||
mb_chan->rx_msg[0] = readl(mb_chan->reg + REG_DB_IN);
|
||||
}
|
||||
|
||||
static int mb_chan_status_ack(struct slimpro_mbox_chan *mb_chan)
|
||||
{
|
||||
u32 val = readl(mb_chan->reg + REG_DB_STAT);
|
||||
|
||||
if (val & MBOX_STATUS_ACK_MASK) {
|
||||
writel(MBOX_STATUS_ACK_MASK, mb_chan->reg + REG_DB_STAT);
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mb_chan_status_avail(struct slimpro_mbox_chan *mb_chan)
|
||||
{
|
||||
u32 val = readl(mb_chan->reg + REG_DB_STAT);
|
||||
|
||||
if (val & MBOX_STATUS_AVAIL_MASK) {
|
||||
mb_chan_recv_msg(mb_chan);
|
||||
writel(MBOX_STATUS_AVAIL_MASK, mb_chan->reg + REG_DB_STAT);
|
||||
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))
|
||||
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 = chan->con_priv;
|
||||
|
||||
mb_chan_send_msg(mb_chan, msg);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int slimpro_mbox_startup(struct mbox_chan *chan)
|
||||
{
|
||||
struct slimpro_mbox_chan *mb_chan = chan->con_priv;
|
||||
int rc;
|
||||
u32 val;
|
||||
|
||||
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 + REG_DB_STAT);
|
||||
/* Unmask doorbell status interrupt */
|
||||
val = readl(mb_chan->reg + REG_DB_STATMASK);
|
||||
val &= ~(MBOX_STATUS_ACK_MASK | MBOX_STATUS_AVAIL_MASK);
|
||||
writel(val, mb_chan->reg + REG_DB_STATMASK);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void slimpro_mbox_shutdown(struct mbox_chan *chan)
|
||||
{
|
||||
struct slimpro_mbox_chan *mb_chan = chan->con_priv;
|
||||
u32 val;
|
||||
|
||||
/* Mask doorbell status interrupt */
|
||||
val = readl(mb_chan->reg + REG_DB_STATMASK);
|
||||
val |= (MBOX_STATUS_ACK_MASK | MBOX_STATUS_AVAIL_MASK);
|
||||
writel(val, mb_chan->reg + REG_DB_STATMASK);
|
||||
|
||||
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 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(&pdev->dev, regs->start, resource_size(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) {
|
||||
if (i == 0) {
|
||||
dev_err(&pdev->dev, "no available IRQ\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
dev_info(&pdev->dev, "no IRQ for channel %d\n", i);
|
||||
break;
|
||||
}
|
||||
|
||||
ctx->mc[i].dev = &pdev->dev;
|
||||
ctx->mc[i].reg = mb_base + i * MBOX_REG_SET_OFFSET;
|
||||
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 = i;
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
static const struct of_device_id slimpro_of_match[] = {
|
||||
{.compatible = "apm,xgene-slimpro-mbox" },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, slimpro_of_match);
|
||||
|
||||
#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",
|
||||
.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)
|
||||
{
|
||||
platform_driver_unregister(&slimpro_mbox_driver);
|
||||
}
|
||||
|
||||
subsys_initcall(slimpro_mbox_init);
|
||||
module_exit(slimpro_mbox_exit);
|
||||
|
||||
MODULE_DESCRIPTION("APM X-Gene SLIMpro Mailbox Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Загрузка…
Ссылка в новой задаче