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Message-ID: <20210413175235.GF750651@xps15>
Date: Tue, 13 Apr 2021 11:52:35 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: peng.fan@....nxp.com
Cc: ohad@...ery.com, bjorn.andersson@...aro.org,
o.rempel@...gutronix.de, robh+dt@...nel.org,
devicetree@...r.kernel.org, shawnguo@...nel.org,
s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
linux-remoteproc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V3 8/8] remoteproc: imx_rproc: support i.MX8MN/P
On Thu, Apr 08, 2021 at 09:54:58AM +0800, peng.fan@....nxp.com wrote:
> From: Peng Fan <peng.fan@....com>
>
> Add i.MX8MN/P remote processor(Cortex-M7) support, we are using ARM
> SMCCC to start/stop M core, not using regmap interface.
>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
> drivers/remoteproc/imx_rproc.c | 89 +++++++++++++++++++++++++++++++---
> 1 file changed, 82 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index b911a7539897..9351626f09c0 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -3,6 +3,7 @@
> * Copyright (c) 2017 Pengutronix, Oleksij Rempel <kernel@...gutronix.de>
> */
>
> +#include <linux/arm-smccc.h>
> #include <linux/clk.h>
> #include <linux/err.h>
> #include <linux/interrupt.h>
> @@ -50,6 +51,11 @@
>
> #define IMX_RPROC_MEM_MAX 32
>
> +#define IMX_SIP_RPROC 0xC2000005
> +#define IMX_SIP_RPROC_START 0x00
> +#define IMX_SIP_RPROC_STARTED 0x01
> +#define IMX_SIP_RPROC_STOP 0x02
> +
> /**
> * struct imx_rproc_mem - slim internal memory structure
> * @cpu_addr: MPU virtual address of the memory region
> @@ -119,6 +125,36 @@ struct imx_rproc {
> enum imx_rproc_mode mode;
> };
>
> +static const struct imx_rproc_att imx_rproc_att_imx8mn[] = {
> + /* dev addr , sys addr , size , flags */
> + /* ITCM */
> + { 0x00000000, 0x007E0000, 0x00020000, ATT_OWN },
> + /* OCRAM_S */
> + { 0x00180000, 0x00180000, 0x00009000, 0 },
> + /* OCRAM */
> + { 0x00900000, 0x00900000, 0x00020000, 0 },
> + /* OCRAM */
> + { 0x00920000, 0x00920000, 0x00020000, 0 },
> + /* OCRAM */
> + { 0x00940000, 0x00940000, 0x00050000, 0 },
> + /* QSPI Code - alias */
> + { 0x08000000, 0x08000000, 0x08000000, 0 },
> + /* DDR (Code) - alias */
> + { 0x10000000, 0x40000000, 0x0FFE0000, 0 },
> + /* DTCM */
> + { 0x20000000, 0x00800000, 0x00020000, ATT_OWN },
> + /* OCRAM_S - alias */
> + { 0x20180000, 0x00180000, 0x00008000, ATT_OWN },
> + /* OCRAM */
> + { 0x20200000, 0x00900000, 0x00020000, ATT_OWN },
> + /* OCRAM */
> + { 0x20220000, 0x00920000, 0x00020000, ATT_OWN },
> + /* OCRAM */
> + { 0x20240000, 0x00940000, 0x00040000, ATT_OWN },
> + /* DDR (Data) */
> + { 0x40000000, 0x40000000, 0x80000000, 0 },
> +};
> +
> static const struct imx_rproc_att imx_rproc_att_imx8mq[] = {
> /* dev addr , sys addr , size , flags */
> /* TCML - alias */
> @@ -205,6 +241,12 @@ static const struct imx_rproc_att imx_rproc_att_imx6sx[] = {
> { 0x80000000, 0x80000000, 0x60000000, 0 },
> };
>
> +static const struct imx_rproc_dcfg imx_rproc_cfg_imx8mn = {
> + .att = imx_rproc_att_imx8mn,
> + .att_size = ARRAY_SIZE(imx_rproc_att_imx8mn),
> + .method = IMX_RPROC_SMC,
> +};
> +
> static const struct imx_rproc_dcfg imx_rproc_cfg_imx8mq = {
> .src_reg = IMX7D_SRC_SCR,
> .src_mask = IMX7D_M4_RST_MASK,
> @@ -246,12 +288,24 @@ static int imx_rproc_start(struct rproc *rproc)
> struct imx_rproc *priv = rproc->priv;
> const struct imx_rproc_dcfg *dcfg = priv->dcfg;
> struct device *dev = priv->dev;
> + struct arm_smccc_res res;
> int ret;
>
> - ret = regmap_update_bits(priv->regmap, dcfg->src_reg,
> - dcfg->src_mask, dcfg->src_start);
> + switch (dcfg->method) {
> + case IMX_RPROC_MMIO:
> + ret = regmap_update_bits(priv->regmap, dcfg->src_reg, dcfg->src_mask,
> + dcfg->src_start);
> + break;
> + case IMX_RPROC_SMC:
> + arm_smccc_smc(IMX_SIP_RPROC, IMX_SIP_RPROC_START, 0, 0, 0, 0, 0, 0, &res);
> + ret = res.a0;
> + break;
> + default:
> + return -EOPNOTSUPP;
> + }
> +
> if (ret)
> - dev_err(dev, "Failed to enable M4!\n");
> + dev_err(dev, "Failed to enable remote cores!\n");
>
> return ret;
> }
> @@ -261,12 +315,26 @@ static int imx_rproc_stop(struct rproc *rproc)
> struct imx_rproc *priv = rproc->priv;
> const struct imx_rproc_dcfg *dcfg = priv->dcfg;
> struct device *dev = priv->dev;
> + struct arm_smccc_res res;
> int ret;
>
> - ret = regmap_update_bits(priv->regmap, dcfg->src_reg,
> - dcfg->src_mask, dcfg->src_stop);
> + switch (dcfg->method) {
> + case IMX_RPROC_MMIO:
> + ret = regmap_update_bits(priv->regmap, dcfg->src_reg, dcfg->src_mask,
> + dcfg->src_stop);
> + break;
> + case IMX_RPROC_SMC:
> + arm_smccc_smc(IMX_SIP_RPROC, IMX_SIP_RPROC_STOP, 0, 0, 0, 0, 0, 0, &res);
> + ret = res.a0;
> + if (res.a1)
> + dev_info(dev, "Not in wfi, force stopped\n");
> + break;
> + default:
> + return -EOPNOTSUPP;
> + }
> +
> if (ret)
> - dev_err(dev, "Failed to stop M4!\n");
> + dev_err(dev, "Failed to stop remote cores\n");
>
> return ret;
> }
> @@ -600,6 +668,7 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
> {
> const struct imx_rproc_dcfg *dcfg = priv->dcfg;
> struct device *dev = priv->dev;
> + struct arm_smccc_res res;
> int ret;
> u32 val;
>
> @@ -616,8 +685,12 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
> priv->mode = IMX_RPROC_EARLY_BOOT;
> }
>
> - if (dcfg->method == IMX_RPROC_NONE)
> + if (dcfg->method == IMX_RPROC_NONE) {
> priv->mode = IMX_RPROC_EARLY_BOOT;
> + } else if (dcfg->method == IMX_RPROC_SMC) {
> + arm_smccc_smc(IMX_SIP_RPROC, IMX_SIP_RPROC_STARTED, 0, 0, 0, 0, 0, 0, &res);
> + priv->mode = res.a0 ? IMX_RPROC_EARLY_BOOT : IMX_RPROC_NORMAL;
> + }
When all patches have been applied this function is really hard to read. I
suggest using a switch() statement like you did in imx_rproc_start() and
imx_rproc_stop().
Thanks,
Mathieu
>
> if (priv->mode == IMX_RPROC_EARLY_BOOT)
> priv->rproc->state = RPROC_DETACHED;
> @@ -747,6 +820,8 @@ static const struct of_device_id imx_rproc_of_match[] = {
> { .compatible = "fsl,imx6sx-cm4", .data = &imx_rproc_cfg_imx6sx },
> { .compatible = "fsl,imx8mq-cm4", .data = &imx_rproc_cfg_imx8mq },
> { .compatible = "fsl,imx8mm-cm4", .data = &imx_rproc_cfg_imx8mq },
> + { .compatible = "fsl,imx8mn-cm7", .data = &imx_rproc_cfg_imx8mn },
> + { .compatible = "fsl,imx8mp-cm7", .data = &imx_rproc_cfg_imx8mn },
> {},
> };
> MODULE_DEVICE_TABLE(of, imx_rproc_of_match);
> --
> 2.30.0
>
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