The MX8M CM7 boot via SMC call is problematic, since not all versions
of ATF support this interface. Extend the MMIO support so it can boot
the CM7 on MX8MN/MP instead and discern the two alternatives using DT
compatible strings.
Signed-off-by: Marek Vasut <marex@xxxxxxx>
---
Cc: Bjorn Andersson <andersson@xxxxxxxxxx>
Cc: Conor Dooley <conor+dt@xxxxxxxxxx>
Cc: Fabio Estevam <festevam@xxxxxxxxx>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@xxxxxxxxxx>
Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Cc: NXP Linux Team <linux-imx@xxxxxxx>
Cc: Peng Fan <peng.fan@xxxxxxx>
Cc: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-remoteproc@xxxxxxxxxxxxxxx
---
V2: Rename 'gpr' to 'fsl,iomuxc-gpr'
---
drivers/remoteproc/imx_rproc.c | 58 ++++++++++++++++++++++++++++++++--
drivers/remoteproc/imx_rproc.h | 2 ++
2 files changed, 58 insertions(+), 2 deletions(-)
diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index 4ee2646ce62ad..8bb293b9f327c 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -40,6 +40,12 @@
#define IMX7D_M4_STOP (IMX7D_ENABLE_M4 | IMX7D_SW_M4C_RST | \
IMX7D_SW_M4C_NON_SCLR_RST)
+#define IMX8M_M7_STOP (IMX7D_ENABLE_M4 | IMX7D_SW_M4C_RST)
+#define IMX8M_M7_POLL IMX7D_ENABLE_M4
+
+#define IMX8M_GPR22 0x58
+#define IMX8M_GPR22_CM7_CPUWAIT BIT(0)
+
/* Address: 0x020D8000 */
#define IMX6SX_SRC_SCR 0x00
#define IMX6SX_ENABLE_M4 BIT(22)
@@ -91,6 +97,7 @@ static int imx_rproc_detach_pd(struct rproc *rproc);
struct imx_rproc {
struct device *dev;
struct regmap *regmap;
+ struct regmap *gpr;
struct rproc *rproc;
const struct imx_rproc_dcfg *dcfg;
struct imx_rproc_mem mem[IMX_RPROC_MEM_MAX];
@@ -285,6 +292,18 @@ static const struct imx_rproc_att imx_rproc_att_imx6sx[] = {
{ 0x80000000, 0x80000000, 0x60000000, 0 },
};
+static const struct imx_rproc_dcfg imx_rproc_cfg_imx8mn_mmio = {
+ .src_reg = IMX7D_SRC_SCR,
+ .src_mask = IMX7D_M4_RST_MASK,
+ .src_start = IMX7D_M4_START,
+ .src_stop = IMX8M_M7_STOP,
+ .gpr_reg = IMX8M_GPR22,
+ .gpr_wait = IMX8M_GPR22_CM7_CPUWAIT,
+ .att = imx_rproc_att_imx8mn,
+ .att_size = ARRAY_SIZE(imx_rproc_att_imx8mn),
+ .method = IMX_RPROC_MMIO,
+};
+
static const struct imx_rproc_dcfg imx_rproc_cfg_imx8mn = {
.att = imx_rproc_att_imx8mn,
.att_size = ARRAY_SIZE(imx_rproc_att_imx8mn),
@@ -365,8 +384,14 @@ static int imx_rproc_start(struct rproc *rproc)
switch (dcfg->method) {
case IMX_RPROC_MMIO:
- ret = regmap_update_bits(priv->regmap, dcfg->src_reg, dcfg->src_mask,
- dcfg->src_start);
+ if (priv->gpr) {
+ ret = regmap_clear_bits(priv->gpr, dcfg->gpr_reg,
+ dcfg->gpr_wait);
+ } else {
+ 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);
@@ -395,6 +420,16 @@ static int imx_rproc_stop(struct rproc *rproc)
switch (dcfg->method) {
case IMX_RPROC_MMIO:
+ if (priv->gpr) {
+ ret = regmap_set_bits(priv->gpr, dcfg->gpr_reg,
+ dcfg->gpr_wait);
+ if (ret) {
+ dev_err(priv->dev,
+ "Failed to quiescence M4 platform!\n");
+ return ret;
+ }
+ }
+
ret = regmap_update_bits(priv->regmap, dcfg->src_reg, dcfg->src_mask,
dcfg->src_stop);
break;
@@ -992,6 +1027,10 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
break;
}
+ priv->gpr = syscon_regmap_lookup_by_phandle(dev->of_node, "fsl,iomuxc-gpr");
+ if (IS_ERR(priv->gpr))
+ priv->gpr = NULL;
+
regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
if (IS_ERR(regmap)) {
dev_err(dev, "failed to find syscon\n");
@@ -1001,6 +1040,19 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
priv->regmap = regmap;
regmap_attach_dev(dev, regmap, &config);
+ if (priv->gpr) {
+ ret = regmap_read(priv->gpr, dcfg->gpr_reg, &val);
+ if (val & dcfg->gpr_wait) {
+ /*
+ * After cold boot, the CM indicates its in wait
+ * state, but not fully powered off. Power it off
+ * fully so firmware can be loaded into it.
+ */
+ imx_rproc_stop(priv->rproc);
+ return 0;
+ }
+ }
+
ret = regmap_read(regmap, dcfg->src_reg, &val);
if (ret) {
dev_err(dev, "Failed to read src\n");
@@ -1142,6 +1194,8 @@ static const struct of_device_id imx_rproc_of_match[] = {
{ .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 },
+ { .compatible = "fsl,imx8mn-cm7-mmio", .data = &imx_rproc_cfg_imx8mn_mmio },
+ { .compatible = "fsl,imx8mp-cm7-mmio", .data = &imx_rproc_cfg_imx8mn_mmio },
{ .compatible = "fsl,imx8qxp-cm4", .data = &imx_rproc_cfg_imx8qxp },
{ .compatible = "fsl,imx8qm-cm4", .data = &imx_rproc_cfg_imx8qm },
{ .compatible = "fsl,imx8ulp-cm33", .data = &imx_rproc_cfg_imx8ulp },
diff --git a/drivers/remoteproc/imx_rproc.h b/drivers/remoteproc/imx_rproc.h
index 1c7e2127c7584..79a1b8956d142 100644
--- a/drivers/remoteproc/imx_rproc.h
+++ b/drivers/remoteproc/imx_rproc.h
@@ -31,6 +31,8 @@ struct imx_rproc_dcfg {
u32 src_mask;
u32 src_start;
u32 src_stop;
+ u32 gpr_reg;
+ u32 gpr_wait;
const struct imx_rproc_att *att;
size_t att_size;
enum imx_rproc_method method;
--
2.40.1
