diff options
Diffstat (limited to 'drivers/mailbox/pl320-ipc.c')
| -rw-r--r-- | drivers/mailbox/pl320-ipc.c | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/drivers/mailbox/pl320-ipc.c b/drivers/mailbox/pl320-ipc.c deleted file mode 100644 index d873cbae2fbb..000000000000 --- a/drivers/mailbox/pl320-ipc.c +++ /dev/null @@ -1,198 +0,0 @@ -/* - * Copyright 2012 Calxeda, Inc. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope 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/types.h> -#include <linux/err.h> -#include <linux/delay.h> -#include <linux/export.h> -#include <linux/io.h> -#include <linux/interrupt.h> -#include <linux/completion.h> -#include <linux/mutex.h> -#include <linux/notifier.h> -#include <linux/spinlock.h> -#include <linux/device.h> -#include <linux/amba/bus.h> - -#include <linux/mailbox.h> - -#define IPCMxSOURCE(m) ((m) * 0x40) -#define IPCMxDSET(m) (((m) * 0x40) + 0x004) -#define IPCMxDCLEAR(m) (((m) * 0x40) + 0x008) -#define IPCMxDSTATUS(m) (((m) * 0x40) + 0x00C) -#define IPCMxMODE(m) (((m) * 0x40) + 0x010) -#define IPCMxMSET(m) (((m) * 0x40) + 0x014) -#define IPCMxMCLEAR(m) (((m) * 0x40) + 0x018) -#define IPCMxMSTATUS(m) (((m) * 0x40) + 0x01C) -#define IPCMxSEND(m) (((m) * 0x40) + 0x020) -#define IPCMxDR(m, dr) (((m) * 0x40) + ((dr) * 4) + 0x024) - -#define IPCMMIS(irq) (((irq) * 8) + 0x800) -#define IPCMRIS(irq) (((irq) * 8) + 0x804) - -#define MBOX_MASK(n) (1 << (n)) -#define IPC_TX_MBOX 1 -#define IPC_RX_MBOX 2 - -#define CHAN_MASK(n) (1 << (n)) -#define A9_SOURCE 1 -#define M3_SOURCE 0 - -static void __iomem *ipc_base; -static int ipc_irq; -static DEFINE_MUTEX(ipc_m1_lock); -static DECLARE_COMPLETION(ipc_completion); -static ATOMIC_NOTIFIER_HEAD(ipc_notifier); - -static inline void set_destination(int source, int mbox) -{ - __raw_writel(CHAN_MASK(source), ipc_base + IPCMxDSET(mbox)); - __raw_writel(CHAN_MASK(source), ipc_base + IPCMxMSET(mbox)); -} - -static inline void clear_destination(int source, int mbox) -{ - __raw_writel(CHAN_MASK(source), ipc_base + IPCMxDCLEAR(mbox)); - __raw_writel(CHAN_MASK(source), ipc_base + IPCMxMCLEAR(mbox)); -} - -static void __ipc_send(int mbox, u32 *data) -{ - int i; - for (i = 0; i < 7; i++) - __raw_writel(data[i], ipc_base + IPCMxDR(mbox, i)); - __raw_writel(0x1, ipc_base + IPCMxSEND(mbox)); -} - -static u32 __ipc_rcv(int mbox, u32 *data) -{ - int i; - for (i = 0; i < 7; i++) - data[i] = __raw_readl(ipc_base + IPCMxDR(mbox, i)); - return data[1]; -} - -/* blocking implmentation from the A9 side, not usuable in interrupts! */ -int pl320_ipc_transmit(u32 *data) -{ - int ret; - - mutex_lock(&ipc_m1_lock); - - init_completion(&ipc_completion); - __ipc_send(IPC_TX_MBOX, data); - ret = wait_for_completion_timeout(&ipc_completion, - msecs_to_jiffies(1000)); - if (ret == 0) { - ret = -ETIMEDOUT; - goto out; - } - - ret = __ipc_rcv(IPC_TX_MBOX, data); -out: - mutex_unlock(&ipc_m1_lock); - return ret; -} -EXPORT_SYMBOL_GPL(pl320_ipc_transmit); - -static irqreturn_t ipc_handler(int irq, void *dev) -{ - u32 irq_stat; - u32 data[7]; - - irq_stat = __raw_readl(ipc_base + IPCMMIS(1)); - if (irq_stat & MBOX_MASK(IPC_TX_MBOX)) { - __raw_writel(0, ipc_base + IPCMxSEND(IPC_TX_MBOX)); - complete(&ipc_completion); - } - if (irq_stat & MBOX_MASK(IPC_RX_MBOX)) { - __ipc_rcv(IPC_RX_MBOX, data); - atomic_notifier_call_chain(&ipc_notifier, data[0], data + 1); - __raw_writel(2, ipc_base + IPCMxSEND(IPC_RX_MBOX)); - } - - return IRQ_HANDLED; -} - -int pl320_ipc_register_notifier(struct notifier_block *nb) -{ - return atomic_notifier_chain_register(&ipc_notifier, nb); -} -EXPORT_SYMBOL_GPL(pl320_ipc_register_notifier); - -int pl320_ipc_unregister_notifier(struct notifier_block *nb) -{ - return atomic_notifier_chain_unregister(&ipc_notifier, nb); -} -EXPORT_SYMBOL_GPL(pl320_ipc_unregister_notifier); - -static int pl320_probe(struct amba_device *adev, const struct amba_id *id) -{ - int ret; - - ipc_base = ioremap(adev->res.start, resource_size(&adev->res)); - if (ipc_base == NULL) - return -ENOMEM; - - __raw_writel(0, ipc_base + IPCMxSEND(IPC_TX_MBOX)); - - ipc_irq = adev->irq[0]; - ret = request_irq(ipc_irq, ipc_handler, 0, dev_name(&adev->dev), NULL); - if (ret < 0) - goto err; - - /* Init slow mailbox */ - __raw_writel(CHAN_MASK(A9_SOURCE), - ipc_base + IPCMxSOURCE(IPC_TX_MBOX)); - __raw_writel(CHAN_MASK(M3_SOURCE), - ipc_base + IPCMxDSET(IPC_TX_MBOX)); - __raw_writel(CHAN_MASK(M3_SOURCE) | CHAN_MASK(A9_SOURCE), - ipc_base + IPCMxMSET(IPC_TX_MBOX)); - - /* Init receive mailbox */ - __raw_writel(CHAN_MASK(M3_SOURCE), - ipc_base + IPCMxSOURCE(IPC_RX_MBOX)); - __raw_writel(CHAN_MASK(A9_SOURCE), - ipc_base + IPCMxDSET(IPC_RX_MBOX)); - __raw_writel(CHAN_MASK(M3_SOURCE) | CHAN_MASK(A9_SOURCE), - ipc_base + IPCMxMSET(IPC_RX_MBOX)); - - return 0; -err: - iounmap(ipc_base); - return ret; -} - -static struct amba_id pl320_ids[] = { - { - .id = 0x00041320, - .mask = 0x000fffff, - }, - { 0, 0 }, -}; - -static struct amba_driver pl320_driver = { - .drv = { - .name = "pl320", - }, - .id_table = pl320_ids, - .probe = pl320_probe, -}; - -static int __init ipc_init(void) -{ - return amba_driver_register(&pl320_driver); -} -module_init(ipc_init); |