[PATCH V3 4/4] remoteproc: imx_rproc: support remote cores booted before Linux Kernel

[peng . fan]

From: Peng Fan <peng....@nxp.com>

 - When remote cores are kicked before Linux Kernel, we are not able
   to get resource table from the firmware elf file, so we need to add
   rsc_table to hold the resource table published by remote cores and
   imx_rproc_get_loaded_rsc_table is to get the resource table.
 - Per remoteproc framework, add attach hook for processor in a detached
   state.
 - Add imx_rproc_detect_mode to detect remote cores' working mode to
   set the state which is required by remoteproc framework.

Reviewed-by: Mathieu Poirier <mathieu.poir...@linaro.org>
Signed-off-by: Peng Fan <peng....@nxp.com>
---
 drivers/remoteproc/imx_rproc.c | 45 ++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index 7cd09971d1a4..d6338872c6db 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -95,6 +95,7 @@ struct imx_rproc {
        struct mbox_chan                *rx_ch;
        struct work_struct              rproc_work;
        struct workqueue_struct         *workqueue;
+       void __iomem                    *rsc_table;
 };
 
 static const struct imx_rproc_att imx_rproc_att_imx8mq[] = {
@@ -395,8 +396,26 @@ static void imx_rproc_kick(struct rproc *rproc, int vqid)
                        __func__, vqid, err);
 }
 
+static int imx_rproc_attach(struct rproc *rproc)
+{
+       return 0;
+}
+
+static struct resource_table *imx_rproc_get_loaded_rsc_table(struct rproc 
*rproc, size_t *table_sz)
+{
+       struct imx_rproc *priv = rproc->priv;
+
+       /* The resource table has already been mapped in imx_rproc_addr_init */
+       if (!priv->rsc_table)
+               return NULL;
+
+       *table_sz = SZ_1K;
+       return (struct resource_table *)priv->rsc_table;
+}
+
 static const struct rproc_ops imx_rproc_ops = {
        .prepare        = imx_rproc_prepare,
+       .attach         = imx_rproc_attach,
        .start          = imx_rproc_start,
        .stop           = imx_rproc_stop,
        .kick           = imx_rproc_kick,
@@ -404,6 +423,7 @@ static const struct rproc_ops imx_rproc_ops = {
        .load           = rproc_elf_load_segments,
        .parse_fw       = imx_rproc_parse_fw,
        .find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
+       .get_loaded_rsc_table = imx_rproc_get_loaded_rsc_table,
        .sanity_check   = rproc_elf_sanity_check,
        .get_boot_addr  = rproc_elf_get_boot_addr,
 };
@@ -470,6 +490,8 @@ static int imx_rproc_addr_init(struct imx_rproc *priv,
                }
                priv->mem[b].sys_addr = res.start;
                priv->mem[b].size = resource_size(&res);
+               if (!strcmp(node->name, "rsc_table"))
+                       priv->rsc_table = priv->mem[b].cpu_addr;
                b++;
        }
 
@@ -536,6 +558,25 @@ static void imx_rproc_free_mbox(struct rproc *rproc)
        mbox_free_channel(priv->rx_ch);
 }
 
+static int imx_rproc_detect_mode(struct imx_rproc *priv)
+{
+       const struct imx_rproc_dcfg *dcfg = priv->dcfg;
+       struct device *dev = priv->dev;
+       int ret;
+       u32 val;
+
+       ret = regmap_read(priv->regmap, dcfg->src_reg, &val);
+       if (ret) {
+               dev_err(dev, "Failed to read src\n");
+               return ret;
+       }
+
+       if (!(val & dcfg->src_stop))
+               priv->rproc->state = RPROC_DETACHED;
+
+       return 0;
+}
+
 static int imx_rproc_probe(struct platform_device *pdev)
 {
        struct device *dev = &pdev->dev;
@@ -590,6 +631,10 @@ static int imx_rproc_probe(struct platform_device *pdev)
                goto err_put_mbox;
        }
 
+       ret = imx_rproc_detect_mode(priv);
+       if (ret)
+               goto err_put_mbox;
+
        priv->clk = devm_clk_get(dev, NULL);
        if (IS_ERR(priv->clk)) {
                dev_err(dev, "Failed to get clock\n");
-- 
2.30.0