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187 lines
4.6 KiB
187 lines
4.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2012 Calxeda, Inc. |
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*/ |
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#include <linux/types.h> |
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#include <linux/err.h> |
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#include <linux/delay.h> |
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#include <linux/export.h> |
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#include <linux/io.h> |
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#include <linux/interrupt.h> |
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#include <linux/completion.h> |
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#include <linux/mutex.h> |
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#include <linux/notifier.h> |
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#include <linux/spinlock.h> |
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#include <linux/device.h> |
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#include <linux/amba/bus.h> |
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#include <linux/pl320-ipc.h> |
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#define IPCMxSOURCE(m) ((m) * 0x40) |
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#define IPCMxDSET(m) (((m) * 0x40) + 0x004) |
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#define IPCMxDCLEAR(m) (((m) * 0x40) + 0x008) |
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#define IPCMxDSTATUS(m) (((m) * 0x40) + 0x00C) |
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#define IPCMxMODE(m) (((m) * 0x40) + 0x010) |
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#define IPCMxMSET(m) (((m) * 0x40) + 0x014) |
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#define IPCMxMCLEAR(m) (((m) * 0x40) + 0x018) |
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#define IPCMxMSTATUS(m) (((m) * 0x40) + 0x01C) |
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#define IPCMxSEND(m) (((m) * 0x40) + 0x020) |
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#define IPCMxDR(m, dr) (((m) * 0x40) + ((dr) * 4) + 0x024) |
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#define IPCMMIS(irq) (((irq) * 8) + 0x800) |
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#define IPCMRIS(irq) (((irq) * 8) + 0x804) |
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#define MBOX_MASK(n) (1 << (n)) |
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#define IPC_TX_MBOX 1 |
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#define IPC_RX_MBOX 2 |
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#define CHAN_MASK(n) (1 << (n)) |
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#define A9_SOURCE 1 |
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#define M3_SOURCE 0 |
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static void __iomem *ipc_base; |
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static int ipc_irq; |
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static DEFINE_MUTEX(ipc_m1_lock); |
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static DECLARE_COMPLETION(ipc_completion); |
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static ATOMIC_NOTIFIER_HEAD(ipc_notifier); |
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static inline void set_destination(int source, int mbox) |
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{ |
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writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxDSET(mbox)); |
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writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxMSET(mbox)); |
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} |
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static inline void clear_destination(int source, int mbox) |
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{ |
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writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxDCLEAR(mbox)); |
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writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxMCLEAR(mbox)); |
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} |
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static void __ipc_send(int mbox, u32 *data) |
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{ |
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int i; |
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for (i = 0; i < 7; i++) |
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writel_relaxed(data[i], ipc_base + IPCMxDR(mbox, i)); |
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writel_relaxed(0x1, ipc_base + IPCMxSEND(mbox)); |
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} |
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static u32 __ipc_rcv(int mbox, u32 *data) |
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{ |
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int i; |
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for (i = 0; i < 7; i++) |
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data[i] = readl_relaxed(ipc_base + IPCMxDR(mbox, i)); |
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return data[1]; |
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} |
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/* blocking implmentation from the A9 side, not usuable in interrupts! */ |
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int pl320_ipc_transmit(u32 *data) |
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{ |
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int ret; |
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mutex_lock(&ipc_m1_lock); |
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init_completion(&ipc_completion); |
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__ipc_send(IPC_TX_MBOX, data); |
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ret = wait_for_completion_timeout(&ipc_completion, |
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msecs_to_jiffies(1000)); |
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if (ret == 0) { |
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ret = -ETIMEDOUT; |
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goto out; |
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} |
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ret = __ipc_rcv(IPC_TX_MBOX, data); |
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out: |
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mutex_unlock(&ipc_m1_lock); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(pl320_ipc_transmit); |
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static irqreturn_t ipc_handler(int irq, void *dev) |
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{ |
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u32 irq_stat; |
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u32 data[7]; |
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irq_stat = readl_relaxed(ipc_base + IPCMMIS(1)); |
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if (irq_stat & MBOX_MASK(IPC_TX_MBOX)) { |
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writel_relaxed(0, ipc_base + IPCMxSEND(IPC_TX_MBOX)); |
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complete(&ipc_completion); |
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} |
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if (irq_stat & MBOX_MASK(IPC_RX_MBOX)) { |
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__ipc_rcv(IPC_RX_MBOX, data); |
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atomic_notifier_call_chain(&ipc_notifier, data[0], data + 1); |
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writel_relaxed(2, ipc_base + IPCMxSEND(IPC_RX_MBOX)); |
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} |
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return IRQ_HANDLED; |
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} |
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int pl320_ipc_register_notifier(struct notifier_block *nb) |
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{ |
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return atomic_notifier_chain_register(&ipc_notifier, nb); |
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} |
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EXPORT_SYMBOL_GPL(pl320_ipc_register_notifier); |
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int pl320_ipc_unregister_notifier(struct notifier_block *nb) |
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{ |
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return atomic_notifier_chain_unregister(&ipc_notifier, nb); |
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} |
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EXPORT_SYMBOL_GPL(pl320_ipc_unregister_notifier); |
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static int pl320_probe(struct amba_device *adev, const struct amba_id *id) |
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{ |
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int ret; |
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ipc_base = ioremap(adev->res.start, resource_size(&adev->res)); |
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if (ipc_base == NULL) |
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return -ENOMEM; |
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writel_relaxed(0, ipc_base + IPCMxSEND(IPC_TX_MBOX)); |
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ipc_irq = adev->irq[0]; |
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ret = request_irq(ipc_irq, ipc_handler, 0, dev_name(&adev->dev), NULL); |
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if (ret < 0) |
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goto err; |
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/* Init slow mailbox */ |
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writel_relaxed(CHAN_MASK(A9_SOURCE), |
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ipc_base + IPCMxSOURCE(IPC_TX_MBOX)); |
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writel_relaxed(CHAN_MASK(M3_SOURCE), |
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ipc_base + IPCMxDSET(IPC_TX_MBOX)); |
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writel_relaxed(CHAN_MASK(M3_SOURCE) | CHAN_MASK(A9_SOURCE), |
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ipc_base + IPCMxMSET(IPC_TX_MBOX)); |
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/* Init receive mailbox */ |
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writel_relaxed(CHAN_MASK(M3_SOURCE), |
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ipc_base + IPCMxSOURCE(IPC_RX_MBOX)); |
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writel_relaxed(CHAN_MASK(A9_SOURCE), |
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ipc_base + IPCMxDSET(IPC_RX_MBOX)); |
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writel_relaxed(CHAN_MASK(M3_SOURCE) | CHAN_MASK(A9_SOURCE), |
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ipc_base + IPCMxMSET(IPC_RX_MBOX)); |
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return 0; |
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err: |
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iounmap(ipc_base); |
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return ret; |
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} |
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static struct amba_id pl320_ids[] = { |
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{ |
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.id = 0x00041320, |
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.mask = 0x000fffff, |
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}, |
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{ 0, 0 }, |
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}; |
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static struct amba_driver pl320_driver = { |
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.drv = { |
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.name = "pl320", |
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}, |
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.id_table = pl320_ids, |
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.probe = pl320_probe, |
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}; |
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static int __init ipc_init(void) |
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{ |
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return amba_driver_register(&pl320_driver); |
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} |
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subsys_initcall(ipc_init);
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