Add support for APM X-Gene platform mailbox driver. Signed-off-by: Feng Kan <fkan@xxxxxxx> --- drivers/mailbox/Kconfig | 10 ++ drivers/mailbox/Makefile | 1 + drivers/mailbox/mailbox-xgene-slimpro.c | 287 ++++++++++++++++++++++++++++++++ 3 files changed, 298 insertions(+) create mode 100644 drivers/mailbox/mailbox-xgene-slimpro.c diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig index 9fd9c67..12ed5c1 100644 --- a/drivers/mailbox/Kconfig +++ b/drivers/mailbox/Kconfig @@ -33,4 +33,14 @@ config OMAP_MBOX_KFIFO_SIZE Specify the default size of mailbox's kfifo buffers (bytes). This can also be changed at runtime (via the mbox_kfifo_size module parameter). + +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 94ed7ce..33b2709 100644 --- a/drivers/mailbox/Makefile +++ b/drivers/mailbox/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_MAILBOX) += mailbox.o obj-$(CONFIG_PL320_MBOX) += pl320-ipc.o obj-$(CONFIG_OMAP2PLUS_MBOX) += omap-mailbox.o +obj-$(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..ae46cc3 --- /dev/null +++ b/drivers/mailbox/mailbox-xgene-slimpro.c @@ -0,0 +1,287 @@ +/* + * APM X-Gene SLIMpro MailBox Driver + * + * Copyright (c) 2014, Applied Micro Circuits Corporation + * Author: Feng Kan fkan@xxxxxxx + * + * 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/module.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/interrupt.h> +#include <linux/acpi.h> +#include <linux/spinlock.h> +#include <linux/delay.h> +#include <linux/mailbox_controller.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 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
