diff options
Diffstat (limited to 'drivers/mailbox/imx-mailbox.c')
| -rw-r--r-- | drivers/mailbox/imx-mailbox.c | 155 |
1 files changed, 155 insertions, 0 deletions
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); |