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author | Stephen Rothwell <sfr@canb.auug.org.au> | 2024-05-02 12:54:38 +1000 |
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committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2024-05-02 12:54:38 +1000 |
commit | f9e6c05f191c2be4fc93939117766f50c642ef93 (patch) | |
tree | 0ffd4d8c246ffd303accb97680824014187f5fc3 | |
parent | 5ac858f3eb61cf83e69c624ff1af70b543feab3d (diff) | |
parent | 0ac39d85a7415cb2e68a8d239f3d2f67175a14fe (diff) | |
download | linux-next-f9e6c05f191c2be4fc93939117766f50c642ef93.tar.gz |
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jassibrar/mailbox.git
Notice: this object is not reachable from any branch.
Notice: this object is not reachable from any branch.
-rw-r--r-- | drivers/mailbox/zynqmp-ipi-mailbox.c | 257 |
1 files changed, 212 insertions, 45 deletions
diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c index 25c65afc030a35..1cb553cced903a 100644 --- a/drivers/mailbox/zynqmp-ipi-mailbox.c +++ b/drivers/mailbox/zynqmp-ipi-mailbox.c @@ -52,6 +52,13 @@ #define IPI_MB_CHNL_TX 0 /* IPI mailbox TX channel */ #define IPI_MB_CHNL_RX 1 /* IPI mailbox RX channel */ +/* IPI Message Buffer Information */ +#define RESP_OFFSET 0x20U +#define DEST_OFFSET 0x40U +#define IPI_BUF_SIZE 0x20U +#define DST_BIT_POS 9U +#define SRC_BITMASK GENMASK(11, 8) + /** * struct zynqmp_ipi_mchan - Description of a Xilinx ZynqMP IPI mailbox channel * @is_opened: indicate if the IPI channel is opened @@ -72,6 +79,10 @@ struct zynqmp_ipi_mchan { unsigned int chan_type; }; +struct zynqmp_ipi_mbox; + +typedef int (*setup_ipi_fn)(struct zynqmp_ipi_mbox *ipi_mbox, struct device_node *node); + /** * struct zynqmp_ipi_mbox - Description of a ZynqMP IPI mailbox * platform data. @@ -81,6 +92,7 @@ struct zynqmp_ipi_mchan { * @remote_id: remote IPI agent ID * @mbox: mailbox Controller * @mchans: array for channels, tx channel and rx channel. + * @setup_ipi_fn: Function Pointer to set up IPI Channels */ struct zynqmp_ipi_mbox { struct zynqmp_ipi_pdata *pdata; @@ -88,6 +100,7 @@ struct zynqmp_ipi_mbox { u32 remote_id; struct mbox_controller mbox; struct zynqmp_ipi_mchan mchans[2]; + setup_ipi_fn setup_ipi_fn; }; /** @@ -163,9 +176,11 @@ static irqreturn_t zynqmp_ipi_interrupt(int irq, void *data) if (ret > 0 && ret & IPI_MB_STATUS_RECV_PENDING) { if (mchan->is_opened) { msg = mchan->rx_buf; - msg->len = mchan->req_buf_size; - memcpy_fromio(msg->data, mchan->req_buf, - msg->len); + if (msg) { + msg->len = mchan->req_buf_size; + memcpy_fromio(msg->data, mchan->req_buf, + msg->len); + } mbox_chan_received_data(chan, (void *)msg); status = IRQ_HANDLED; } @@ -275,26 +290,26 @@ static int zynqmp_ipi_send_data(struct mbox_chan *chan, void *data) if (mchan->chan_type == IPI_MB_CHNL_TX) { /* Send request message */ - if (msg && msg->len > mchan->req_buf_size) { + if (msg && msg->len > mchan->req_buf_size && mchan->req_buf) { dev_err(dev, "channel %d message length %u > max %lu\n", mchan->chan_type, (unsigned int)msg->len, mchan->req_buf_size); return -EINVAL; } - if (msg && msg->len) + if (msg && msg->len && mchan->req_buf) memcpy_toio(mchan->req_buf, msg->data, msg->len); /* Kick IPI mailbox to send message */ arg0 = SMC_IPI_MAILBOX_NOTIFY; zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res); } else { /* Send response message */ - if (msg && msg->len > mchan->resp_buf_size) { + if (msg && msg->len > mchan->resp_buf_size && mchan->resp_buf) { dev_err(dev, "channel %d message length %u > max %lu\n", mchan->chan_type, (unsigned int)msg->len, mchan->resp_buf_size); return -EINVAL; } - if (msg && msg->len) + if (msg && msg->len && mchan->resp_buf) memcpy_toio(mchan->resp_buf, msg->data, msg->len); arg0 = SMC_IPI_MAILBOX_ACK; zynqmp_ipi_fw_call(ipi_mbox, arg0, IPI_SMC_ACK_EIRQ_MASK, @@ -415,12 +430,6 @@ static struct mbox_chan *zynqmp_ipi_of_xlate(struct mbox_controller *mbox, return chan; } -static const struct of_device_id zynqmp_ipi_of_match[] = { - { .compatible = "xlnx,zynqmp-ipi-mailbox" }, - {}, -}; -MODULE_DEVICE_TABLE(of, zynqmp_ipi_of_match); - /** * zynqmp_ipi_mbox_get_buf_res - Get buffer resource from the IPI dev node * @@ -470,12 +479,9 @@ static void zynqmp_ipi_mbox_dev_release(struct device *dev) static int zynqmp_ipi_mbox_probe(struct zynqmp_ipi_mbox *ipi_mbox, struct device_node *node) { - struct zynqmp_ipi_mchan *mchan; struct mbox_chan *chans; struct mbox_controller *mbox; - struct resource res; struct device *dev, *mdev; - const char *name; int ret; dev = ipi_mbox->pdata->dev; @@ -495,6 +501,73 @@ static int zynqmp_ipi_mbox_probe(struct zynqmp_ipi_mbox *ipi_mbox, } mdev = &ipi_mbox->dev; + /* Get the IPI remote agent ID */ + ret = of_property_read_u32(node, "xlnx,ipi-id", &ipi_mbox->remote_id); + if (ret < 0) { + dev_err(dev, "No IPI remote ID is specified.\n"); + return ret; + } + + ret = ipi_mbox->setup_ipi_fn(ipi_mbox, node); + if (ret) { + dev_err(dev, "Failed to set up IPI Buffers.\n"); + return ret; + } + + mbox = &ipi_mbox->mbox; + mbox->dev = mdev; + mbox->ops = &zynqmp_ipi_chan_ops; + mbox->num_chans = 2; + mbox->txdone_irq = false; + mbox->txdone_poll = true; + mbox->txpoll_period = 5; + mbox->of_xlate = zynqmp_ipi_of_xlate; + chans = devm_kzalloc(mdev, 2 * sizeof(*chans), GFP_KERNEL); + if (!chans) + return -ENOMEM; + mbox->chans = chans; + chans[IPI_MB_CHNL_TX].con_priv = &ipi_mbox->mchans[IPI_MB_CHNL_TX]; + chans[IPI_MB_CHNL_RX].con_priv = &ipi_mbox->mchans[IPI_MB_CHNL_RX]; + ipi_mbox->mchans[IPI_MB_CHNL_TX].chan_type = IPI_MB_CHNL_TX; + ipi_mbox->mchans[IPI_MB_CHNL_RX].chan_type = IPI_MB_CHNL_RX; + ret = devm_mbox_controller_register(mdev, mbox); + if (ret) + dev_err(mdev, + "Failed to register mbox_controller(%d)\n", ret); + else + dev_info(mdev, + "Registered ZynqMP IPI mbox with TX/RX channels.\n"); + return ret; +} + +/** + * zynqmp_ipi_setup - set up IPI Buffers for classic flow + * + * @ipi_mbox: pointer to IPI mailbox private data structure + * @node: IPI mailbox device node + * + * This will be used to set up IPI Buffers for ZynqMP SOC if user + * wishes to use classic driver usage model on new SOC's with only + * buffered IPIs. + * + * Note that bufferless IPIs and mixed usage of buffered and bufferless + * IPIs are not supported with this flow. + * + * This will be invoked with compatible string "xlnx,zynqmp-ipi-mailbox". + * + * Return: 0 for success, negative value for failure + */ +static int zynqmp_ipi_setup(struct zynqmp_ipi_mbox *ipi_mbox, + struct device_node *node) +{ + struct zynqmp_ipi_mchan *mchan; + struct device *mdev; + struct resource res; + const char *name; + int ret; + + mdev = &ipi_mbox->dev; + mchan = &ipi_mbox->mchans[IPI_MB_CHNL_TX]; name = "local_request_region"; ret = zynqmp_ipi_mbox_get_buf_res(node, name, &res); @@ -569,37 +642,110 @@ static int zynqmp_ipi_mbox_probe(struct zynqmp_ipi_mbox *ipi_mbox, if (!mchan->rx_buf) return -ENOMEM; - /* Get the IPI remote agent ID */ - ret = of_property_read_u32(node, "xlnx,ipi-id", &ipi_mbox->remote_id); - if (ret < 0) { - dev_err(dev, "No IPI remote ID is specified.\n"); - return ret; + return 0; +} + +/** + * versal_ipi_setup - Set up IPIs to support mixed usage of + * Buffered and Bufferless IPIs. + * + * @ipi_mbox: pointer to IPI mailbox private data structure + * @node: IPI mailbox device node + * + * Return: 0 for success, negative value for failure + */ +static int versal_ipi_setup(struct zynqmp_ipi_mbox *ipi_mbox, + struct device_node *node) +{ + struct zynqmp_ipi_mchan *tx_mchan, *rx_mchan; + struct resource host_res, remote_res; + struct device_node *parent_node; + int host_idx, remote_idx; + struct device *mdev; + + tx_mchan = &ipi_mbox->mchans[IPI_MB_CHNL_TX]; + rx_mchan = &ipi_mbox->mchans[IPI_MB_CHNL_RX]; + parent_node = of_get_parent(node); + mdev = &ipi_mbox->dev; + + host_idx = zynqmp_ipi_mbox_get_buf_res(parent_node, "msg", &host_res); + remote_idx = zynqmp_ipi_mbox_get_buf_res(node, "msg", &remote_res); + + /* + * Only set up buffers if both sides claim to have msg buffers. + * This is because each buffered IPI's corresponding msg buffers + * are reserved for use by other buffered IPI's. + */ + if (!host_idx && !remote_idx) { + u32 host_src, host_dst, remote_src, remote_dst; + u32 buff_sz; + + buff_sz = resource_size(&host_res); + + host_src = host_res.start & SRC_BITMASK; + remote_src = remote_res.start & SRC_BITMASK; + + host_dst = (host_src >> DST_BIT_POS) * DEST_OFFSET; + remote_dst = (remote_src >> DST_BIT_POS) * DEST_OFFSET; + + /* Validate that IPI IDs is within IPI Message buffer space. */ + if (host_dst >= buff_sz || remote_dst >= buff_sz) { + dev_err(mdev, + "Invalid IPI Message buffer values: %x %x\n", + host_dst, remote_dst); + return -EINVAL; + } + + tx_mchan->req_buf = devm_ioremap(mdev, + host_res.start | remote_dst, + IPI_BUF_SIZE); + if (!tx_mchan->req_buf) { + dev_err(mdev, "Unable to map IPI buffer I/O memory\n"); + return -ENOMEM; + } + + tx_mchan->resp_buf = devm_ioremap(mdev, + (remote_res.start | host_dst) + + RESP_OFFSET, IPI_BUF_SIZE); + if (!tx_mchan->resp_buf) { + dev_err(mdev, "Unable to map IPI buffer I/O memory\n"); + return -ENOMEM; + } + + rx_mchan->req_buf = devm_ioremap(mdev, + remote_res.start | host_dst, + IPI_BUF_SIZE); + if (!rx_mchan->req_buf) { + dev_err(mdev, "Unable to map IPI buffer I/O memory\n"); + return -ENOMEM; + } + + rx_mchan->resp_buf = devm_ioremap(mdev, + (host_res.start | remote_dst) + + RESP_OFFSET, IPI_BUF_SIZE); + if (!rx_mchan->resp_buf) { + dev_err(mdev, "Unable to map IPI buffer I/O memory\n"); + return -ENOMEM; + } + + tx_mchan->resp_buf_size = IPI_BUF_SIZE; + tx_mchan->req_buf_size = IPI_BUF_SIZE; + tx_mchan->rx_buf = devm_kzalloc(mdev, IPI_BUF_SIZE + + sizeof(struct zynqmp_ipi_message), + GFP_KERNEL); + if (!tx_mchan->rx_buf) + return -ENOMEM; + + rx_mchan->resp_buf_size = IPI_BUF_SIZE; + rx_mchan->req_buf_size = IPI_BUF_SIZE; + rx_mchan->rx_buf = devm_kzalloc(mdev, IPI_BUF_SIZE + + sizeof(struct zynqmp_ipi_message), + GFP_KERNEL); + if (!rx_mchan->rx_buf) + return -ENOMEM; } - mbox = &ipi_mbox->mbox; - mbox->dev = mdev; - mbox->ops = &zynqmp_ipi_chan_ops; - mbox->num_chans = 2; - mbox->txdone_irq = false; - mbox->txdone_poll = true; - mbox->txpoll_period = 5; - mbox->of_xlate = zynqmp_ipi_of_xlate; - chans = devm_kzalloc(mdev, 2 * sizeof(*chans), GFP_KERNEL); - if (!chans) - return -ENOMEM; - mbox->chans = chans; - chans[IPI_MB_CHNL_TX].con_priv = &ipi_mbox->mchans[IPI_MB_CHNL_TX]; - chans[IPI_MB_CHNL_RX].con_priv = &ipi_mbox->mchans[IPI_MB_CHNL_RX]; - ipi_mbox->mchans[IPI_MB_CHNL_TX].chan_type = IPI_MB_CHNL_TX; - ipi_mbox->mchans[IPI_MB_CHNL_RX].chan_type = IPI_MB_CHNL_RX; - ret = devm_mbox_controller_register(mdev, mbox); - if (ret) - dev_err(mdev, - "Failed to register mbox_controller(%d)\n", ret); - else - dev_info(mdev, - "Registered ZynqMP IPI mbox with TX/RX channels.\n"); - return ret; + return 0; } /** @@ -630,6 +776,7 @@ static int zynqmp_ipi_probe(struct platform_device *pdev) struct zynqmp_ipi_pdata *pdata; struct zynqmp_ipi_mbox *mbox; int num_mboxes, ret = -EINVAL; + setup_ipi_fn ipi_fn; num_mboxes = of_get_available_child_count(np); if (num_mboxes == 0) { @@ -650,9 +797,18 @@ static int zynqmp_ipi_probe(struct platform_device *pdev) return ret; } + ipi_fn = (setup_ipi_fn)device_get_match_data(&pdev->dev); + if (!ipi_fn) { + dev_err(dev, + "Mbox Compatible String is missing IPI Setup fn.\n"); + return -ENODEV; + } + pdata->num_mboxes = num_mboxes; mbox = pdata->ipi_mboxes; + mbox->setup_ipi_fn = ipi_fn; + for_each_available_child_of_node(np, nc) { mbox->pdata = pdata; ret = zynqmp_ipi_mbox_probe(mbox, nc); @@ -695,6 +851,17 @@ static void zynqmp_ipi_remove(struct platform_device *pdev) zynqmp_ipi_free_mboxes(pdata); } +static const struct of_device_id zynqmp_ipi_of_match[] = { + { .compatible = "xlnx,zynqmp-ipi-mailbox", + .data = &zynqmp_ipi_setup, + }, + { .compatible = "xlnx,versal-ipi-mailbox", + .data = &versal_ipi_setup, + }, + {}, +}; +MODULE_DEVICE_TABLE(of, zynqmp_ipi_of_match); + static struct platform_driver zynqmp_ipi_driver = { .probe = zynqmp_ipi_probe, .remove_new = zynqmp_ipi_remove, |