Messages in this thread Patch in this message |  | | From | Weiyi Lu <> | Subject | [PATCH v9 5/9] soc: mediatek: Add subsys clock control for bus protection | Date | Tue, 10 Dec 2019 14:46:49 +0800 |
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Add subsys CG control flow before/after the bus protect control due to bus protection need SMI bus relative CGs enabled to feedback its ack.
Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com> --- drivers/soc/mediatek/mtk-scpsys.c | 72 +++++++++++++++++++++++++++++++++++++-- 1 file changed, 70 insertions(+), 2 deletions(-)
diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c index 466bb749..2bbf907 100644 --- a/drivers/soc/mediatek/mtk-scpsys.c +++ b/drivers/soc/mediatek/mtk-scpsys.c @@ -108,6 +108,7 @@ enum clk_id { }; #define MAX_CLKS 3 +#define MAX_SUBSYS_CLKS 10 /** * struct scp_domain_data - scp domain data for power on/off flow @@ -120,6 +121,8 @@ enum clk_id { * @clk_id: The basic clocks required by this power domain. * @basic_clk_id: provide the same purpose with field "clk_id" * by declaring basic clock prefix name rather than clk_id. + * @subsys_clk_prefix: The prefix name of the clocks need to be enabled + * before releasing bus protection. * @caps: The flag for active wake-up action. * @bp_table: The mask table for multiple step bus protection. */ @@ -132,6 +135,7 @@ struct scp_domain_data { u32 bus_prot_mask; enum clk_id clk_id[MAX_CLKS]; const char *basic_clk_id[MAX_CLKS]; + const char *subsys_clk_prefix; u8 caps; struct bus_prot bp_table[MAX_STEPS]; }; @@ -142,6 +146,7 @@ struct scp_domain { struct generic_pm_domain genpd; struct scp *scp; struct clk *clk[MAX_CLKS]; + struct clk *subsys_clk[MAX_SUBSYS_CLKS]; const struct scp_domain_data *data; struct regulator *supply; }; @@ -349,16 +354,22 @@ static int scpsys_power_on(struct generic_pm_domain *genpd) val |= PWR_RST_B_BIT; writel(val, ctl_addr); - ret = scpsys_sram_enable(scpd, ctl_addr); + ret = scpsys_clk_enable(scpd->subsys_clk, MAX_SUBSYS_CLKS); if (ret < 0) goto err_pwr_ack; + ret = scpsys_sram_enable(scpd, ctl_addr); + if (ret < 0) + goto err_sram; + ret = scpsys_bus_protect_disable(scpd); if (ret < 0) - goto err_pwr_ack; + goto err_sram; return 0; +err_sram: + scpsys_clk_disable(scpd->subsys_clk, MAX_SUBSYS_CLKS); err_pwr_ack: scpsys_clk_disable(scpd->clk, MAX_CLKS); err_clk: @@ -385,6 +396,8 @@ static int scpsys_power_off(struct generic_pm_domain *genpd) if (ret < 0) goto out; + scpsys_clk_disable(scpd->subsys_clk, MAX_SUBSYS_CLKS); + /* subsys power off */ val = readl(ctl_addr); val |= PWR_ISO_BIT; @@ -422,6 +435,48 @@ static int scpsys_power_off(struct generic_pm_domain *genpd) return ret; } +static int init_subsys_clks(struct platform_device *pdev, + const char *prefix, struct clk **clk) +{ + struct device_node *node = pdev->dev.of_node; + u32 prefix_len, sub_clk_cnt = 0; + struct property *prop; + const char *clk_name; + + if (!node) { + dev_err(&pdev->dev, "Cannot find scpsys node: %ld\n", + PTR_ERR(node)); + return PTR_ERR(node); + } + + prefix_len = strlen(prefix); + + of_property_for_each_string(node, "clock-names", prop, clk_name) { + if (!strncmp(clk_name, prefix, prefix_len) && + (clk_name[prefix_len] == '-')) { + if (sub_clk_cnt >= MAX_SUBSYS_CLKS) { + dev_err(&pdev->dev, + "subsys clk out of range %d\n", + sub_clk_cnt); + return -ENOMEM; + } + + clk[sub_clk_cnt] = devm_clk_get(&pdev->dev, + clk_name); + + if (IS_ERR(clk[sub_clk_cnt])) { + dev_err(&pdev->dev, + "Subsys clk get fail %ld\n", + PTR_ERR(clk[sub_clk_cnt])); + return PTR_ERR(clk[sub_clk_cnt]); + } + sub_clk_cnt++; + } + } + + return sub_clk_cnt; +} + static void init_clks(struct platform_device *pdev, struct clk **clk) { int i; @@ -509,6 +564,7 @@ static struct scp *init_scp(struct platform_device *pdev, struct scp_domain *scpd = &scp->domains[i]; struct generic_pm_domain *genpd = &scpd->genpd; const struct scp_domain_data *data = &scp_domain_data[i]; + int clk_cnt; pd_data->domains[i] = genpd; scpd->scp = scp; @@ -537,6 +593,18 @@ static struct scp *init_scp(struct platform_device *pdev, data->basic_clk_id[j]); } + if (data->subsys_clk_prefix) { + clk_cnt = init_subsys_clks(pdev, + data->subsys_clk_prefix, + scpd->subsys_clk); + if (clk_cnt < 0) { + dev_err(&pdev->dev, + "%s: subsys clk unavailable\n", + data->name); + return ERR_PTR(clk_cnt); + } + } + genpd->name = data->name; genpd->power_off = scpsys_power_off; genpd->power_on = scpsys_power_on; -- 1.8.1.1.dirty |  |