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Date: Tue, 7 Jan 2020 13:21:50 -0800
From: Evan Green <evgreen@...omium.org>
To: Sibi Sankar <sibis@...eaurora.org>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>, ohad@...ery.com,
Mark Rutland <mark.rutland@....com>,
linux-arm-msm <linux-arm-msm@...r.kernel.org>,
linux-remoteproc@...r.kernel.org,
Philipp Zabel <p.zabel@...gutronix.de>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
Andy Gross <agross@...nel.org>
Subject: Re: [PATCH v2 2/2] remoteproc: mss: q6v5-mss: Add modem support on SC7180
On Wed, Dec 18, 2019 at 9:45 PM Sibi Sankar <sibis@...eaurora.org> wrote:
>
> Add the out of reset sequence support for modem sub-system on SC7180
> SoCs. It requires access to an additional halt nav register to put
> the modem back into reset.
>
> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
> ---
> drivers/remoteproc/qcom_q6v5_mss.c | 199 ++++++++++++++++++++++++++++-
> 1 file changed, 198 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index 164fc2a53ef11..51f451311f5fc 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -68,6 +68,9 @@
> #define AXI_HALTREQ_REG 0x0
> #define AXI_HALTACK_REG 0x4
> #define AXI_IDLE_REG 0x8
> +#define NAV_AXI_HALTREQ_BIT BIT(0)
> +#define NAV_AXI_HALTACK_BIT BIT(1)
> +#define NAV_AXI_IDLE_BIT BIT(2)
>
> #define HALT_ACK_TIMEOUT_MS 100
>
> @@ -101,9 +104,11 @@
> #define QDSP6SS_ACC_OVERRIDE_VAL 0x20
>
> /* QDSP6v65 parameters */
> +#define QDSP6SS_CORE_CBCR 0x20
> #define QDSP6SS_SLEEP 0x3C
> #define QDSP6SS_BOOT_CORE_START 0x400
> #define QDSP6SS_BOOT_CMD 0x404
> +#define QDSP6SS_BOOT_STATUS 0x408
> #define SLEEP_CHECK_MAX_LOOPS 200
> #define BOOT_FSM_TIMEOUT 10000
>
> @@ -131,6 +136,7 @@ struct rproc_hexagon_res {
> int version;
> bool need_mem_protection;
> bool has_alt_reset;
> + bool has_halt_nav;
> };
>
> struct q6v5 {
> @@ -141,9 +147,14 @@ struct q6v5 {
> void __iomem *rmb_base;
>
> struct regmap *halt_map;
> + struct regmap *halt_nav_map;
> + struct regmap *conn_map;
> +
> u32 halt_q6;
> u32 halt_modem;
> u32 halt_nc;
> + u32 halt_nav;
> + u32 conn_box;
>
> struct reset_control *mss_restart;
> struct reset_control *pdc_reset;
> @@ -187,6 +198,7 @@ struct q6v5 {
> struct qcom_sysmon *sysmon;
> bool need_mem_protection;
> bool has_alt_reset;
> + bool has_halt_nav;
> int mpss_perm;
> int mba_perm;
> const char *hexagon_mdt_image;
> @@ -198,6 +210,7 @@ enum {
> MSS_MSM8974,
> MSS_MSM8996,
> MSS_MSM8998,
> + MSS_SC7180,
> MSS_SDM845,
> };
>
> @@ -396,6 +409,18 @@ static int q6v5_reset_assert(struct q6v5 *qproc)
> reset_control_assert(qproc->pdc_reset);
> ret = reset_control_reset(qproc->mss_restart);
> reset_control_deassert(qproc->pdc_reset);
> + } else if (qproc->has_halt_nav) {
> + /* SWAR using CONN_BOX_SPARE_0 for pipeline glitch issue */
Can you elaborate more in this comment, or remove it? Right now it
doesn't help me since I don't know what SWAR is, I don't see a
reference to CONN_BOX_SPARE_0 in the code, I don't know what a
CONN_BOX is, and I don't know any details about the glitch issue :)
> + reset_control_assert(qproc->pdc_reset);
> + regmap_update_bits(qproc->conn_map, qproc->conn_box,
> + BIT(0), BIT(0));
Make a register name #define for this bit?
> + regmap_update_bits(qproc->halt_nav_map, qproc->halt_nav,
> + NAV_AXI_HALTREQ_BIT, 0);
> + reset_control_assert(qproc->mss_restart);
> + reset_control_deassert(qproc->pdc_reset);
> + regmap_update_bits(qproc->conn_map, qproc->conn_box,
> + BIT(0), 0);
> + ret = reset_control_deassert(qproc->mss_restart);
> } else {
> ret = reset_control_assert(qproc->mss_restart);
> }
> @@ -413,6 +438,8 @@ static int q6v5_reset_deassert(struct q6v5 *qproc)
> ret = reset_control_reset(qproc->mss_restart);
> writel(0, qproc->rmb_base + RMB_MBA_ALT_RESET);
> reset_control_deassert(qproc->pdc_reset);
> + } else if (qproc->has_halt_nav) {
> + ret = reset_control_reset(qproc->mss_restart);
> } else {
> ret = reset_control_deassert(qproc->mss_restart);
> }
> @@ -499,6 +526,54 @@ static int q6v5proc_reset(struct q6v5 *qproc)
> return ret;
> }
>
> + goto pbl_wait;
Ick, this could benefit from a refactor that pulls those sorta-common
steps "Remove IO clamp" through "Start core execution" into a helper
function and then calls the new function from each case that needs it.
> + } else if (qproc->version == MSS_SC7180) {
> + val = readl(qproc->reg_base + QDSP6SS_SLEEP);
> + val |= 0x1;
It'd be nice if there were defines for these magic 0x1 values in this hunk too.
> + writel(val, qproc->reg_base + QDSP6SS_SLEEP);
> +
> + ret = readl_poll_timeout(qproc->reg_base + QDSP6SS_SLEEP,
> + val, !(val & BIT(31)), 1,
> + SLEEP_CHECK_MAX_LOOPS);
> + if (ret) {
> + dev_err(qproc->dev, "QDSP6SS Sleep clock timed out\n");
> + return -ETIMEDOUT;
> + }
This toggling of the sleep bit is the same as sdm845, it could also be
put into a helper function.
> +
> + /* Turn on the XO clock needed for PLL setup */
> + val = readl(qproc->reg_base + QDSP6SS_XO_CBCR);
> + val |= 0x1;
> + writel(val, qproc->reg_base + QDSP6SS_XO_CBCR);
> +
> + ret = readl_poll_timeout(qproc->reg_base + QDSP6SS_XO_CBCR,
> + val, !(val & BIT(31)), 1,
> + SLEEP_CHECK_MAX_LOOPS);
Nit: SLEEP_CHECK_MAX_LOOPS isn't a loop count, it should really have
been named something like SLEEP_CHECK_TIMEOUT_US. Could be done in a
separate change.
> + if (ret) {
> + dev_err(qproc->dev, "QDSP6SS XO clock timed out\n");
> + return -ETIMEDOUT;
> + }
> +
> + /* Configure Q6 core CBCR to auto-enable after reset sequence */
> + val = readl(qproc->reg_base + QDSP6SS_CORE_CBCR);
> + val |= 0x1;
> + writel(val, qproc->reg_base + QDSP6SS_CORE_CBCR);
> +
> + /* De-assert the Q6 stop core signal */
> + writel(1, qproc->reg_base + QDSP6SS_BOOT_CORE_START);
> +
> + /* Trigger the boot FSM to start the Q6 out-of-reset sequence */
> + writel(1, qproc->reg_base + QDSP6SS_BOOT_CMD);
> +
> + /* Poll the QDSP6SS_BOOT_STATUS for FSM completion */
> + ret = readl_poll_timeout(qproc->reg_base + QDSP6SS_BOOT_STATUS,
> + val, (val & BIT(0)) != 0, 1,
> + SLEEP_CHECK_MAX_LOOPS);
> + if (ret) {
> + dev_err(qproc->dev, "Boot FSM failed to complete.\n");
> + /* Reset the modem so that boot FSM is in reset state */
> + q6v5_reset_deassert(qproc);
> + return ret;
> + }
> goto pbl_wait;
> } else if (qproc->version == MSS_MSM8996 ||
> qproc->version == MSS_MSM8998) {
> @@ -667,6 +742,39 @@ static void q6v5proc_halt_axi_port(struct q6v5 *qproc,
> regmap_write(halt_map, offset + AXI_HALTREQ_REG, 0);
> }
>
> +static void q6v5proc_halt_nav_axi_port(struct q6v5 *qproc,
> + struct regmap *halt_map,
> + u32 offset)
> +{
> + unsigned long timeout;
> + unsigned int val;
> + int ret;
> +
> + /* Check if we're already idle */
> + ret = regmap_read(halt_map, offset, &val);
> + if (!ret && (val & NAV_AXI_IDLE_BIT))
> + return;
> +
> + /* Assert halt request */
> + regmap_update_bits(halt_map, offset, NAV_AXI_HALTREQ_BIT,
> + NAV_AXI_HALTREQ_BIT);
> +
> + /* Wait for halt ack*/
> + timeout = jiffies + msecs_to_jiffies(HALT_ACK_TIMEOUT_MS);
> + for (;;) {
> + ret = regmap_read(halt_map, offset, &val);
> + if (ret || (val & NAV_AXI_HALTACK_BIT) ||
> + time_after(jiffies, timeout))
> + break;
> +
> + udelay(5);
> + }
> +
> + ret = regmap_read(halt_map, offset, &val);
> + if (ret || !(val & NAV_AXI_IDLE_BIT))
> + dev_err(qproc->dev, "port failed halt\n");
> +}
> +
> static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw)
> {
> unsigned long dma_attrs = DMA_ATTR_FORCE_CONTIGUOUS;
> @@ -829,6 +937,9 @@ static int q6v5_mba_load(struct q6v5 *qproc)
> halt_axi_ports:
> q6v5proc_halt_axi_port(qproc, qproc->halt_map, qproc->halt_q6);
> q6v5proc_halt_axi_port(qproc, qproc->halt_map, qproc->halt_modem);
> + if (qproc->has_halt_nav)
> + q6v5proc_halt_nav_axi_port(qproc, qproc->halt_nav_map,
> + qproc->halt_nav);
> q6v5proc_halt_axi_port(qproc, qproc->halt_map, qproc->halt_nc);
>
> reclaim_mba:
> @@ -876,6 +987,9 @@ static void q6v5_mba_reclaim(struct q6v5 *qproc)
>
> q6v5proc_halt_axi_port(qproc, qproc->halt_map, qproc->halt_q6);
> q6v5proc_halt_axi_port(qproc, qproc->halt_map, qproc->halt_modem);
> + if (qproc->has_halt_nav)
> + q6v5proc_halt_nav_axi_port(qproc, qproc->halt_nav_map,
> + qproc->halt_nav);
> q6v5proc_halt_axi_port(qproc, qproc->halt_map, qproc->halt_nc);
> if (qproc->version == MSS_MSM8996) {
> /*
> @@ -1253,6 +1367,47 @@ static int q6v5_init_mem(struct q6v5 *qproc, struct platform_device *pdev)
> qproc->halt_modem = args.args[1];
> qproc->halt_nc = args.args[2];
>
> + if (qproc->has_halt_nav) {
> + struct platform_device *nav_pdev;
> +
> + ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
> + "qcom,halt-nav-regs",
> + 1, 0, &args);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "failed to parse halt-nav-regs\n");
> + return -EINVAL;
> + }
> +
> + nav_pdev = of_find_device_by_node(args.np);
> + of_node_put(args.np);
> + if (!nav_pdev) {
> + dev_err(&pdev->dev, "failed to get mss clock device\n");
> + return -EPROBE_DEFER;
> + }
> +
> + qproc->halt_nav_map = dev_get_regmap(&nav_pdev->dev, NULL);
> + if (!qproc->halt_nav_map) {
> + dev_err(&pdev->dev, "failed to get map from device\n");
> + return -EINVAL;
> + }
> + qproc->halt_nav = args.args[0];
> +
> + ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
> + "qcom,halt-nav-regs",
> + 1, 1, &args);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "failed to parse halt-nav-regs\n");
> + return -EINVAL;
> + }
> +
> + qproc->conn_map = syscon_node_to_regmap(args.np);
> + of_node_put(args.np);
> + if (IS_ERR(qproc->conn_map))
> + return PTR_ERR(qproc->conn_map);
> +
> + qproc->conn_box = args.args[0];
> + }
> +
> return 0;
> }
>
> @@ -1327,7 +1482,7 @@ static int q6v5_init_reset(struct q6v5 *qproc)
> return PTR_ERR(qproc->mss_restart);
> }
>
> - if (qproc->has_alt_reset) {
> + if (qproc->has_alt_reset || qproc->has_halt_nav) {
> qproc->pdc_reset = devm_reset_control_get_exclusive(qproc->dev,
> "pdc_reset");
> if (IS_ERR(qproc->pdc_reset)) {
> @@ -1426,6 +1581,7 @@ static int q6v5_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, qproc);
>
> + qproc->has_halt_nav = desc->has_halt_nav;
> ret = q6v5_init_mem(qproc, pdev);
> if (ret)
> goto free_rproc;
> @@ -1549,6 +1705,41 @@ static int q6v5_remove(struct platform_device *pdev)
> return 0;
> }
>
> +static const struct rproc_hexagon_res sc7180_mss = {
> + .hexagon_mba_image = "mba.mbn",
> + .proxy_clk_names = (char*[]){
> + "xo",
> + NULL
> + },
> + .reset_clk_names = (char*[]){
> + "iface",
> + "bus",
> + "snoc_axi",
> + NULL
> + },
> + .active_clk_names = (char*[]){
> + "mnoc_axi",
> + "nav",
> + "mss_nav",
> + "mss_crypto",
> + NULL
> + },
> + .active_pd_names = (char*[]){
> + "load_state",
> + NULL
> + },
> + .proxy_pd_names = (char*[]){
> + "cx",
> + "mx",
> + "mss",
> + NULL
> + },
> + .need_mem_protection = true,
> + .has_alt_reset = false,
> + .has_halt_nav = true,
> + .version = MSS_SC7180,
> +};
> +
> static const struct rproc_hexagon_res sdm845_mss = {
> .hexagon_mba_image = "mba.mbn",
> .proxy_clk_names = (char*[]){
> @@ -1580,6 +1771,7 @@ static const struct rproc_hexagon_res sdm845_mss = {
> },
> .need_mem_protection = true,
> .has_alt_reset = true,
> + .has_halt_nav = false,
> .version = MSS_SDM845,
> };
>
> @@ -1606,6 +1798,7 @@ static const struct rproc_hexagon_res msm8998_mss = {
> },
> .need_mem_protection = true,
> .has_alt_reset = false,
> + .has_halt_nav = false,
> .version = MSS_MSM8998,
> };
>
> @@ -1635,6 +1828,7 @@ static const struct rproc_hexagon_res msm8996_mss = {
> },
> .need_mem_protection = true,
> .has_alt_reset = false,
> + .has_halt_nav = false,
> .version = MSS_MSM8996,
> };
>
> @@ -1667,6 +1861,7 @@ static const struct rproc_hexagon_res msm8916_mss = {
> },
> .need_mem_protection = false,
> .has_alt_reset = false,
> + .has_halt_nav = false,
> .version = MSS_MSM8916,
> };
>
> @@ -1707,6 +1902,7 @@ static const struct rproc_hexagon_res msm8974_mss = {
> },
> .need_mem_protection = false,
> .has_alt_reset = false,
> + .has_halt_nav = false,
> .version = MSS_MSM8974,
> };
>
> @@ -1716,6 +1912,7 @@ static const struct of_device_id q6v5_of_match[] = {
> { .compatible = "qcom,msm8974-mss-pil", .data = &msm8974_mss},
> { .compatible = "qcom,msm8996-mss-pil", .data = &msm8996_mss},
> { .compatible = "qcom,msm8998-mss-pil", .data = &msm8998_mss},
> + { .compatible = "qcom,sc7180-mss-pil", .data = &sc7180_mss},
> { .compatible = "qcom,sdm845-mss-pil", .data = &sdm845_mss},
> { },
> };
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
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