diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0109-mailbox-Enable-BCM2835-mailbox-support.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.1/0109-mailbox-Enable-BCM2835-mailbox-support.patch | 274 |
1 files changed, 0 insertions, 274 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0109-mailbox-Enable-BCM2835-mailbox-support.patch b/target/linux/brcm2708/patches-4.1/0109-mailbox-Enable-BCM2835-mailbox-support.patch deleted file mode 100644 index ee446378a4..0000000000 --- a/target/linux/brcm2708/patches-4.1/0109-mailbox-Enable-BCM2835-mailbox-support.patch +++ /dev/null @@ -1,274 +0,0 @@ -From a1587c365bbfc9db5c550a7a360a3159608f2eee Mon Sep 17 00:00:00 2001 -From: Lubomir Rintel <lkundrak@v3.sk> -Date: Tue, 5 May 2015 13:27:45 -0700 -Subject: [PATCH 109/222] mailbox: Enable BCM2835 mailbox support - -This mailbox driver provides a single mailbox channel to write 32-bit -values to the VPU and get a 32-bit response. The Raspberry Pi -firmware uses this mailbox channel to implement firmware calls, while -Roku 2 (despite being derived from the same firmware tree) doesn't. - -The driver was originally submitted by Lubomir, based on the -out-of-tree 2708 mailbox driver. Eric Anholt fixed it up for -upstreaming, with the major functional change being that it now has no -notion of multiple channels (since that is a firmware-dependent -concept) and instead the raspberrypi-firmware driver will do that -bit-twiddling in its own messages. -[Jassi: made the 'mbox_chan_ops' struct as const and removed a redundant -variable] - -Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> -Signed-off-by: Craig McGeachie <slapdau@yahoo.com.au> -Signed-off-by: Eric Anholt <eric@anholt.net> -Acked-by: Stephen Warren <swarren@wwwdotorg.org> -Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> ---- - drivers/mailbox/Kconfig | 9 ++ - drivers/mailbox/Makefile | 2 + - drivers/mailbox/bcm2835-mailbox.c | 216 ++++++++++++++++++++++++++++++++++++++ - 3 files changed, 227 insertions(+) - create mode 100644 drivers/mailbox/bcm2835-mailbox.c - ---- a/drivers/mailbox/Kconfig -+++ b/drivers/mailbox/Kconfig -@@ -66,4 +66,13 @@ 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 BCM2835_MBOX -+ tristate "BCM2835 Mailbox" -+ depends on ARCH_BCM2835 -+ help -+ An implementation of the BCM2385 Mailbox. It is used to invoke -+ the services of the Videocore. Say Y here if you want to use the -+ BCM2835 Mailbox. -+ - endif ---- a/drivers/mailbox/Makefile -+++ b/drivers/mailbox/Makefile -@@ -13,3 +13,5 @@ obj-$(CONFIG_OMAP2PLUS_MBOX) += omap-mai - obj-$(CONFIG_PCC) += pcc.o - - obj-$(CONFIG_ALTERA_MBOX) += mailbox-altera.o -+ -+obj-$(CONFIG_BCM2835_MBOX) += bcm2835-mailbox.o ---- /dev/null -+++ b/drivers/mailbox/bcm2835-mailbox.c -@@ -0,0 +1,216 @@ -+/* -+ * Copyright (C) 2010,2015 Broadcom -+ * Copyright (C) 2013-2014 Lubomir Rintel -+ * Copyright (C) 2013 Craig McGeachie -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ * -+ * This device provides a mechanism for writing to the mailboxes, -+ * that are shared between the ARM and the VideoCore processor -+ * -+ * Parts of the driver are based on: -+ * - arch/arm/mach-bcm2708/vcio.c file written by Gray Girling that was -+ * obtained from branch "rpi-3.6.y" of git://github.com/raspberrypi/ -+ * linux.git -+ * - drivers/mailbox/bcm2835-ipc.c by Lubomir Rintel at -+ * https://github.com/hackerspace/rpi-linux/blob/lr-raspberry-pi/drivers/ -+ * mailbox/bcm2835-ipc.c -+ * - documentation available on the following web site: -+ * https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface -+ */ -+ -+#include <linux/device.h> -+#include <linux/dma-mapping.h> -+#include <linux/err.h> -+#include <linux/interrupt.h> -+#include <linux/irq.h> -+#include <linux/kernel.h> -+#include <linux/mailbox_controller.h> -+#include <linux/module.h> -+#include <linux/of_address.h> -+#include <linux/of_irq.h> -+#include <linux/platform_device.h> -+#include <linux/spinlock.h> -+ -+/* Mailboxes */ -+#define ARM_0_MAIL0 0x00 -+#define ARM_0_MAIL1 0x20 -+ -+/* -+ * Mailbox registers. We basically only support mailbox 0 & 1. We -+ * deliver to the VC in mailbox 1, it delivers to us in mailbox 0. See -+ * BCM2835-ARM-Peripherals.pdf section 1.3 for an explanation about -+ * the placement of memory barriers. -+ */ -+#define MAIL0_RD (ARM_0_MAIL0 + 0x00) -+#define MAIL0_POL (ARM_0_MAIL0 + 0x10) -+#define MAIL0_STA (ARM_0_MAIL0 + 0x18) -+#define MAIL0_CNF (ARM_0_MAIL0 + 0x1C) -+#define MAIL1_WRT (ARM_0_MAIL1 + 0x00) -+ -+/* Status register: FIFO state. */ -+#define ARM_MS_FULL BIT(31) -+#define ARM_MS_EMPTY BIT(30) -+ -+/* Configuration register: Enable interrupts. */ -+#define ARM_MC_IHAVEDATAIRQEN BIT(0) -+ -+struct bcm2835_mbox { -+ void __iomem *regs; -+ spinlock_t lock; -+ struct mbox_controller controller; -+}; -+ -+static struct bcm2835_mbox *bcm2835_link_mbox(struct mbox_chan *link) -+{ -+ return container_of(link->mbox, struct bcm2835_mbox, controller); -+} -+ -+static irqreturn_t bcm2835_mbox_irq(int irq, void *dev_id) -+{ -+ struct bcm2835_mbox *mbox = dev_id; -+ struct device *dev = mbox->controller.dev; -+ struct mbox_chan *link = &mbox->controller.chans[0]; -+ -+ while (!(readl(mbox->regs + MAIL0_STA) & ARM_MS_EMPTY)) { -+ u32 msg = readl(mbox->regs + MAIL0_RD); -+ dev_dbg(dev, "Reply 0x%08X\n", msg); -+ mbox_chan_received_data(link, &msg); -+ } -+ return IRQ_HANDLED; -+} -+ -+static int bcm2835_send_data(struct mbox_chan *link, void *data) -+{ -+ struct bcm2835_mbox *mbox = bcm2835_link_mbox(link); -+ u32 msg = *(u32 *)data; -+ -+ spin_lock(&mbox->lock); -+ writel(msg, mbox->regs + MAIL1_WRT); -+ dev_dbg(mbox->controller.dev, "Request 0x%08X\n", msg); -+ spin_unlock(&mbox->lock); -+ return 0; -+} -+ -+static int bcm2835_startup(struct mbox_chan *link) -+{ -+ struct bcm2835_mbox *mbox = bcm2835_link_mbox(link); -+ -+ /* Enable the interrupt on data reception */ -+ writel(ARM_MC_IHAVEDATAIRQEN, mbox->regs + MAIL0_CNF); -+ -+ return 0; -+} -+ -+static void bcm2835_shutdown(struct mbox_chan *link) -+{ -+ struct bcm2835_mbox *mbox = bcm2835_link_mbox(link); -+ -+ writel(0, mbox->regs + MAIL0_CNF); -+} -+ -+static bool bcm2835_last_tx_done(struct mbox_chan *link) -+{ -+ struct bcm2835_mbox *mbox = bcm2835_link_mbox(link); -+ bool ret; -+ -+ spin_lock(&mbox->lock); -+ ret = !(readl(mbox->regs + MAIL0_STA) & ARM_MS_FULL); -+ spin_unlock(&mbox->lock); -+ return ret; -+} -+ -+static const struct mbox_chan_ops bcm2835_mbox_chan_ops = { -+ .send_data = bcm2835_send_data, -+ .startup = bcm2835_startup, -+ .shutdown = bcm2835_shutdown, -+ .last_tx_done = bcm2835_last_tx_done -+}; -+ -+static struct mbox_chan *bcm2835_mbox_index_xlate(struct mbox_controller *mbox, -+ const struct of_phandle_args *sp) -+{ -+ if (sp->args_count != 0) -+ return NULL; -+ -+ return &mbox->chans[0]; -+} -+ -+static int bcm2835_mbox_probe(struct platform_device *pdev) -+{ -+ struct device *dev = &pdev->dev; -+ int ret = 0; -+ struct resource *iomem; -+ struct bcm2835_mbox *mbox; -+ -+ mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL); -+ if (mbox == NULL) -+ return -ENOMEM; -+ spin_lock_init(&mbox->lock); -+ -+ ret = devm_request_irq(dev, irq_of_parse_and_map(dev->of_node, 0), -+ bcm2835_mbox_irq, 0, dev_name(dev), mbox); -+ if (ret) { -+ dev_err(dev, "Failed to register a mailbox IRQ handler: %d\n", -+ ret); -+ return -ENODEV; -+ } -+ -+ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); -+ mbox->regs = devm_ioremap_resource(&pdev->dev, iomem); -+ if (IS_ERR(mbox->regs)) { -+ ret = PTR_ERR(mbox->regs); -+ dev_err(&pdev->dev, "Failed to remap mailbox regs: %d\n", ret); -+ return ret; -+ } -+ -+ mbox->controller.txdone_poll = true; -+ mbox->controller.txpoll_period = 5; -+ mbox->controller.ops = &bcm2835_mbox_chan_ops; -+ mbox->controller.of_xlate = &bcm2835_mbox_index_xlate; -+ mbox->controller.dev = dev; -+ mbox->controller.num_chans = 1; -+ mbox->controller.chans = devm_kzalloc(dev, -+ sizeof(*mbox->controller.chans), GFP_KERNEL); -+ if (!mbox->controller.chans) -+ return -ENOMEM; -+ -+ ret = mbox_controller_register(&mbox->controller); -+ if (ret) -+ return ret; -+ -+ platform_set_drvdata(pdev, mbox); -+ dev_info(dev, "mailbox enabled\n"); -+ -+ return ret; -+} -+ -+static int bcm2835_mbox_remove(struct platform_device *pdev) -+{ -+ struct bcm2835_mbox *mbox = platform_get_drvdata(pdev); -+ mbox_controller_unregister(&mbox->controller); -+ return 0; -+} -+ -+static const struct of_device_id bcm2835_mbox_of_match[] = { -+ { .compatible = "brcm,bcm2835-mbox", }, -+ {}, -+}; -+MODULE_DEVICE_TABLE(of, bcm2835_mbox_of_match); -+ -+static struct platform_driver bcm2835_mbox_driver = { -+ .driver = { -+ .name = "bcm2835-mbox", -+ .owner = THIS_MODULE, -+ .of_match_table = bcm2835_mbox_of_match, -+ }, -+ .probe = bcm2835_mbox_probe, -+ .remove = bcm2835_mbox_remove, -+}; -+module_platform_driver(bcm2835_mbox_driver); -+ -+MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>"); -+MODULE_DESCRIPTION("BCM2835 mailbox IPC driver"); -+MODULE_LICENSE("GPL v2"); |