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Date: Fri, 20 Mar 2020 14:36:17 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: peng.fan@....com
Cc: shawnguo@...nel.org, s.hauer@...gutronix.de,
jassisinghbrar@...il.com, leonard.crestez@....com,
kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
Anson.Huang@....com, aisheng.dong@....com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7 3/4] mailbox: imx: add SCU MU support
On Thu, Mar 19, 2020 at 03:49:52PM +0800, peng.fan@....com wrote:
> From: Peng Fan <peng.fan@....com>
>
> i.MX8/8X SCU MU is dedicated for communication between SCU and Cortex-A
> cores from hardware design, and could not be reused for other purpose.
>
> Per i.MX8/8X Reference mannual, Chapter "12.9.2.3.2 Messaging Examples",
> Passing short messages: Transmit register(s) can be used to pass
> short messages from one to four words in length. For example, when
> a four-word message is desired, only one of the registers needs to
> have its corresponding interrupt enable bit set at the receiver side;
> the message’s first three words are written to the registers whose
> interrupt is masked, and the fourth word is written to the other
> register (which triggers an interrupt at the receiver side).
>
> i.MX8/8X SCU firmware IPC is an implementation of passing short
> messages. But current imx-mailbox driver only support one word
> message, i.MX8/8X linux side firmware has to request four TX
> and four RX to support IPC to SCU firmware. This is low efficent
> and more interrupts triggered compared with one TX and
> one RX.
>
> To make SCU MU work,
> - parse the size of msg.
> - Only enable TR0/RR0 interrupt for transmit/receive message.
> - For TX/RX, only support one TX channel and one RX channel
> - For RX, support receive msg larger than 4 u32 words.
> - Support 6 channels, TX0/RX0/RXDB[0-3], not support TXDB.
>
> Reviewed-by: Oleksij Rempel <o.rempel@...gutronix.de>
> Signed-off-by: Peng Fan <peng.fan@....com>
Looks ok.
Thank you
> ---
> V7:
> Add TE/RE check
>
> V6:
> Add R-b tag
> Use %zu for printk sizeof
>
> V5:
> Code style cleanup
> Add more debug msg
> Drop __packed aligned
> idx santity check in scu xlate
>
> V4:
> Added separate chans init and xlate function for SCU MU
> Limit chans to TX0/RX0/RXDB[0-3], max 6 chans.
> Santity check to msg size
>
> V3:
> Added scu type tx/rx and SCU MU type
>
> drivers/mailbox/imx-mailbox.c | 155 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 155 insertions(+)
>
> diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
> index df6c4ecd913c..7906624a731c 100644
> --- a/drivers/mailbox/imx-mailbox.c
> +++ b/drivers/mailbox/imx-mailbox.c
> @@ -4,8 +4,10 @@
> */
>
> #include <linux/clk.h>
> +#include <linux/firmware/imx/ipc.h>
> #include <linux/interrupt.h>
> #include <linux/io.h>
> +#include <linux/iopoll.h>
> #include <linux/kernel.h>
> #include <linux/mailbox_controller.h>
> #include <linux/module.h>
> @@ -27,6 +29,8 @@
> #define IMX_MU_xCR_GIRn(x) BIT(16 + (3 - (x)))
>
> #define IMX_MU_CHANS 16
> +/* TX0/RX0/RXDB[0-3] */
> +#define IMX_MU_SCU_CHANS 6
> #define IMX_MU_CHAN_NAME_SIZE 20
>
> enum imx_mu_chan_type {
> @@ -36,6 +40,11 @@ enum imx_mu_chan_type {
> IMX_MU_TYPE_RXDB, /* Rx doorbell */
> };
>
> +struct imx_sc_rpc_msg_max {
> + struct imx_sc_rpc_msg hdr;
> + u32 data[7];
> +};
> +
> struct imx_mu_con_priv {
> unsigned int idx;
> char irq_desc[IMX_MU_CHAN_NAME_SIZE];
> @@ -134,6 +143,83 @@ static int imx_mu_generic_rx(struct imx_mu_priv *priv,
> return 0;
> }
>
> +static int imx_mu_scu_tx(struct imx_mu_priv *priv,
> + struct imx_mu_con_priv *cp,
> + void *data)
> +{
> + struct imx_sc_rpc_msg_max *msg = data;
> + u32 *arg = data;
> + int i, ret;
> + u32 xsr;
> +
> + switch (cp->type) {
> + case IMX_MU_TYPE_TX:
> + if (msg->hdr.size > sizeof(*msg)) {
> + /*
> + * The real message size can be different to
> + * struct imx_sc_rpc_msg_max size
> + */
> + dev_err(priv->dev, "Exceed max msg size (%zu) on TX, got: %i\n", sizeof(*msg), msg->hdr.size);
> + return -EINVAL;
> + }
> +
> + for (i = 0; i < 4 && i < msg->hdr.size; i++)
> + imx_mu_write(priv, *arg++, priv->dcfg->xTR[i % 4]);
> + for (; i < msg->hdr.size; i++) {
> + ret = readl_poll_timeout(priv->base + priv->dcfg->xSR,
> + xsr,
> + xsr & IMX_MU_xSR_TEn(i % 4),
> + 0, 100);
> + if (ret) {
> + dev_err(priv->dev, "Send data index: %d timeout\n", i);
> + return ret;
> + }
> + imx_mu_write(priv, *arg++, priv->dcfg->xTR[i % 4]);
> + }
> +
> + imx_mu_xcr_rmw(priv, IMX_MU_xCR_TIEn(cp->idx), 0);
> + break;
> + default:
> + dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int imx_mu_scu_rx(struct imx_mu_priv *priv,
> + struct imx_mu_con_priv *cp)
> +{
> + struct imx_sc_rpc_msg_max msg;
> + u32 *data = (u32 *)&msg;
> + int i, ret;
> + u32 xsr;
> +
> + imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_RIEn(0));
> + *data++ = imx_mu_read(priv, priv->dcfg->xRR[0]);
> +
> + if (msg.hdr.size > sizeof(msg)) {
> + dev_err(priv->dev, "Exceed max msg size (%zu) on RX, got: %i\n",
> + sizeof(msg), msg.hdr.size);
> + return -EINVAL;
> + }
> +
> + for (i = 1; i < msg.hdr.size; i++) {
> + ret = readl_poll_timeout(priv->base + priv->dcfg->xSR, xsr,
> + xsr & IMX_MU_xSR_RFn(i % 4), 0, 100);
> + if (ret) {
> + dev_err(priv->dev, "timeout read idx %d\n", i);
> + return ret;
> + }
> + *data++ = imx_mu_read(priv, priv->dcfg->xRR[i % 4]);
> + }
> +
> + imx_mu_xcr_rmw(priv, IMX_MU_xCR_RIEn(0), 0);
> + mbox_chan_received_data(cp->chan, (void *)&msg);
> +
> + return 0;
> +}
> +
> static void imx_mu_txdb_tasklet(unsigned long data)
> {
> struct imx_mu_con_priv *cp = (struct imx_mu_con_priv *)data;
> @@ -263,6 +349,42 @@ static const struct mbox_chan_ops imx_mu_ops = {
> .shutdown = imx_mu_shutdown,
> };
>
> +static struct mbox_chan *imx_mu_scu_xlate(struct mbox_controller *mbox,
> + const struct of_phandle_args *sp)
> +{
> + u32 type, idx, chan;
> +
> + if (sp->args_count != 2) {
> + dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + type = sp->args[0]; /* channel type */
> + idx = sp->args[1]; /* index */
> +
> + switch (type) {
> + case IMX_MU_TYPE_TX:
> + case IMX_MU_TYPE_RX:
> + if (idx != 0)
> + dev_err(mbox->dev, "Invalid chan idx: %d\n", idx);
> + chan = type;
> + break;
> + case IMX_MU_TYPE_RXDB:
> + chan = 2 + idx;
> + break;
> + default:
> + dev_err(mbox->dev, "Invalid chan type: %d\n", type);
> + return NULL;
> + }
> +
> + if (chan >= mbox->num_chans) {
> + dev_err(mbox->dev, "Not supported channel number: %d. (type: %d, idx: %d)\n", chan, type, idx);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + return &mbox->chans[chan];
> +}
> +
> static struct mbox_chan * imx_mu_xlate(struct mbox_controller *mbox,
> const struct of_phandle_args *sp)
> {
> @@ -310,6 +432,28 @@ static void imx_mu_init_generic(struct imx_mu_priv *priv)
> imx_mu_write(priv, 0, priv->dcfg->xCR);
> }
>
> +static void imx_mu_init_scu(struct imx_mu_priv *priv)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < IMX_MU_SCU_CHANS; i++) {
> + struct imx_mu_con_priv *cp = &priv->con_priv[i];
> +
> + cp->idx = i < 2 ? 0 : i - 2;
> + cp->type = i < 2 ? i : IMX_MU_TYPE_RXDB;
> + cp->chan = &priv->mbox_chans[i];
> + priv->mbox_chans[i].con_priv = cp;
> + snprintf(cp->irq_desc, sizeof(cp->irq_desc),
> + "imx_mu_chan[%i-%i]", cp->type, cp->idx);
> + }
> +
> + priv->mbox.num_chans = IMX_MU_SCU_CHANS;
> + priv->mbox.of_xlate = imx_mu_scu_xlate;
> +
> + /* Set default MU configuration */
> + imx_mu_write(priv, 0, priv->dcfg->xCR);
> +}
> +
> static int imx_mu_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -396,9 +540,20 @@ static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
> .xCR = 0x64,
> };
>
> +static const struct imx_mu_dcfg imx_mu_cfg_imx8_scu = {
> + .tx = imx_mu_scu_tx,
> + .rx = imx_mu_scu_rx,
> + .init = imx_mu_init_scu,
> + .xTR = {0x0, 0x4, 0x8, 0xc},
> + .xRR = {0x10, 0x14, 0x18, 0x1c},
> + .xSR = 0x20,
> + .xCR = 0x24,
> +};
> +
> static const struct of_device_id imx_mu_dt_ids[] = {
> { .compatible = "fsl,imx7ulp-mu", .data = &imx_mu_cfg_imx7ulp },
> { .compatible = "fsl,imx6sx-mu", .data = &imx_mu_cfg_imx6sx },
> + { .compatible = "fsl,imx8-mu-scu", .data = &imx_mu_cfg_imx8_scu },
> { },
> };
> MODULE_DEVICE_TABLE(of, imx_mu_dt_ids);
> --
> 2.16.4
>
>
--
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