[PATCH v2 6/7] remoteproc: qcom_q6v5_pas: Add support to attach a DSP

Melody Olvera
2023-03-06T23:12:34Z

Some chipsets will have DSPs which will have begun running prior
to linux booting, so add support to late attach these DSPs by
adding support for:
- run-time checking of an offline or running DSP via rmb register
- a late attach framework to attach to the running DSP
- a handshake mechanism to ensure full and proper booting via rmb

Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>
---
drivers/remoteproc/qcom_q6v5_pas.c | 103 ++++++++++++++++++++++++++++-
1 file changed, 102 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
index 0871108fb4dc..e22be6a029a8 100644
--- a/drivers/remoteproc/qcom_q6v5_pas.c
+++ b/drivers/remoteproc/qcom_q6v5_pas.c
@@ -242,10 +242,89 @@ static int adsp_load(struct rproc *rproc, const struct firmware *fw)
return ret;
}

+static int adsp_attach(struct rproc *rproc)
+{
+ struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+ int i, ret;
+
+ ret = qcom_q6v5_prepare(&adsp->q6v5);
+ if (ret)
+ return ret;
+
+ ret = adsp_pds_enable(adsp, adsp->proxy_pds, adsp->proxy_pd_count);
+ if (ret < 0)
+ goto disable_irqs;
+
+ ret = clk_prepare_enable(adsp->xo);
+ if (ret)
+ goto disable_proxy_pds;
+
+ ret = clk_prepare_enable(adsp->aggre2_clk);
+ if (ret)
+ goto disable_xo_clk;
+
+ if (adsp->cx_supply) {
+ ret = regulator_enable(adsp->cx_supply);
+ if (ret)
+ goto disable_aggre2_clk;
+ }
+
+ if (adsp->px_supply) {
+ ret = regulator_enable(adsp->px_supply);
+ if (ret)
+ goto disable_cx_supply;
+ }
+
+ /* if needed, signal Q6 to continute booting */
+ if (adsp->q6v5.rmb_base) {
+ for (i = 0; i < RMB_POLL_MAX_TIMES; i++) {
+ if (readl_relaxed(adsp->q6v5.rmb_base + RMB_BOOT_WAIT_REG)) {
+ writel_relaxed(1, adsp->q6v5.rmb_base + RMB_BOOT_CONT_REG);
+ break;
+ }
+ msleep(20);
+ }
+
+ if (!readl_relaxed(adsp->q6v5.rmb_base + RMB_BOOT_WAIT_REG)) {
+ dev_err(adsp->dev, "Didn't get rmb signal from %s\n", rproc->name);
+ goto disable_px_supply;
+ }
+ }
+
+ ret = qcom_q6v5_wait_for_start(&adsp->q6v5, msecs_to_jiffies(5000));
+ if (ret == -ETIMEDOUT) {
+ dev_err(adsp->dev, "start timed out\n");
+ qcom_scm_pas_shutdown(adsp->pas_id);
+ goto disable_px_supply;
+ }
+
+ return 0;
+
+disable_px_supply:
+ if (adsp->px_supply)
+ regulator_disable(adsp->px_supply);
+disable_cx_supply:
+ if (adsp->cx_supply)
+ regulator_disable(adsp->cx_supply);
+disable_aggre2_clk:
+ clk_disable_unprepare(adsp->aggre2_clk);
+disable_xo_clk:
+ clk_disable_unprepare(adsp->xo);
+disable_proxy_pds:
+ adsp_pds_disable(adsp, adsp->proxy_pds, adsp->proxy_pd_count);
+disable_irqs:
+ qcom_q6v5_unprepare(&adsp->q6v5);
+
+ /* Remove pointer to the loaded firmware, only valid in adsp_load() & adsp_start() */
+ adsp->firmware = NULL;
+
+ return ret;
+}
+
static int adsp_start(struct rproc *rproc)
{
struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
- int ret;
+ int i, ret;

ret = qcom_q6v5_prepare(&adsp->q6v5);
if (ret)
@@ -304,6 +383,22 @@ static int adsp_start(struct rproc *rproc)
goto release_pas_metadata;
}

+ /* if needed, signal Q6 to continute booting */
+ if (adsp->q6v5.rmb_base) {
+ for (i = 0; i < RMB_POLL_MAX_TIMES; i++) {
+ if (readl_relaxed(adsp->q6v5.rmb_base + RMB_BOOT_WAIT_REG)) {
+ writel_relaxed(1, adsp->q6v5.rmb_base + RMB_BOOT_CONT_REG);
+ break;
+ }
+ msleep(20);
+ }
+
+ if (!readl_relaxed(adsp->q6v5.rmb_base + RMB_BOOT_WAIT_REG)) {
+ dev_err(adsp->dev, "Didn't get rmb signal from %s\n", rproc->name);
+ goto release_pas_metadata;
+ }
+ }
+
ret = qcom_q6v5_wait_for_start(&adsp->q6v5, msecs_to_jiffies(5000));
if (ret == -ETIMEDOUT) {
dev_err(adsp->dev, "start timed out\n");
@@ -413,6 +508,7 @@ static unsigned long adsp_panic(struct rproc *rproc)
static const struct rproc_ops adsp_ops = {
.unprepare = adsp_unprepare,
.start = adsp_start,
+ .attach = adsp_attach,
.stop = adsp_stop,
.da_to_va = adsp_da_to_va,
.parse_fw = qcom_register_dump_segments,
@@ -423,6 +519,7 @@ static const struct rproc_ops adsp_ops = {
static const struct rproc_ops adsp_minidump_ops = {
.unprepare = adsp_unprepare,
.start = adsp_start,
+ .attach = adsp_attach,
.stop = adsp_stop,
.da_to_va = adsp_da_to_va,
.load = adsp_load,
@@ -728,6 +825,10 @@ static int adsp_probe(struct platform_device *pdev)
if (ret)
goto detach_proxy_pds;

+ if (adsp->q6v5.rmb_base &&
+ readl_relaxed(adsp->q6v5.rmb_base + RMB_Q6_BOOT_STATUS_REG))
+ rproc->state = RPROC_DETACHED;
+
qcom_add_glink_subdev(rproc, &adsp->glink_subdev, desc->ssr_name);
qcom_add_smd_subdev(rproc, &adsp->smd_subdev);
adsp->sysmon = qcom_add_sysmon_subdev(rproc,
--
2.25.1