From fa7e843a901d4ea6b092fea67406f85e8ec60b22 Mon Sep 17 00:00:00 2001 From: "weiyi.lu@mediatek.com" Date: Tue, 28 Nov 2017 15:28:18 +0800 Subject: [PATCH] soc: mediatek: extend bus protection API MT2712 add "set/clear" bus control register to each control register set instead of providing only one "enable" control register, we could avoid the read-modify-write racing by declaring "bus_prot_reg_update" as "false" in scp_soc_data or declaring as "true" to use the legacy update method. By improving the mtk-infracfg bus protection implementation to support set/clear bus protection control method by IC configuration. Signed-off-by: Weiyi Lu Signed-off-by: Matthias Brugger --- drivers/soc/mediatek/mtk-infracfg.c | 26 ++++++++++++++++++++++---- drivers/soc/mediatek/mtk-scpsys.c | 28 ++++++++++++++++++++-------- include/linux/soc/mediatek/infracfg.h | 7 ++++--- 3 files changed, 46 insertions(+), 15 deletions(-) diff --git a/drivers/soc/mediatek/mtk-infracfg.c b/drivers/soc/mediatek/mtk-infracfg.c index dba3055..8c310de 100644 --- a/drivers/soc/mediatek/mtk-infracfg.c +++ b/drivers/soc/mediatek/mtk-infracfg.c @@ -19,23 +19,33 @@ #define INFRA_TOPAXI_PROTECTEN 0x0220 #define INFRA_TOPAXI_PROTECTSTA1 0x0228 +#define INFRA_TOPAXI_PROTECTEN_SET 0x0260 +#define INFRA_TOPAXI_PROTECTEN_CLR 0x0264 /** * mtk_infracfg_set_bus_protection - enable bus protection * @regmap: The infracfg regmap * @mask: The mask containing the protection bits to be enabled. + * @reg_update: The boolean flag determines to set the protection bits + * by regmap_update_bits with enable register(PROTECTEN) or + * by regmap_write with set register(PROTECTEN_SET). * * This function enables the bus protection bits for disabled power * domains so that the system does not hang when some unit accesses the * bus while in power down. */ -int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask) +int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask, + bool reg_update) { unsigned long expired; u32 val; int ret; - regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, mask); + if (reg_update) + regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, + mask); + else + regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_SET, mask); expired = jiffies + HZ; @@ -59,16 +69,24 @@ int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask) * mtk_infracfg_clear_bus_protection - disable bus protection * @regmap: The infracfg regmap * @mask: The mask containing the protection bits to be disabled. + * @reg_update: The boolean flag determines to clear the protection bits + * by regmap_update_bits with enable register(PROTECTEN) or + * by regmap_write with clear register(PROTECTEN_CLR). * * This function disables the bus protection bits previously enabled with * mtk_infracfg_set_bus_protection. */ -int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask) + +int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask, + bool reg_update) { unsigned long expired; int ret; - regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, 0); + if (reg_update) + regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, 0); + else + regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_CLR, mask); expired = jiffies + HZ; diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c index e570b6a..4c484b1 100644 --- a/drivers/soc/mediatek/mtk-scpsys.c +++ b/drivers/soc/mediatek/mtk-scpsys.c @@ -134,6 +134,7 @@ struct scp { void __iomem *base; struct regmap *infracfg; struct scp_ctrl_reg ctrl_reg; + bool bus_prot_reg_update; }; struct scp_subdomain { @@ -147,6 +148,7 @@ struct scp_soc_data { const struct scp_subdomain *subdomains; int num_subdomains; const struct scp_ctrl_reg regs; + bool bus_prot_reg_update; }; static int scpsys_domain_is_on(struct scp_domain *scpd) @@ -254,7 +256,8 @@ static int scpsys_power_on(struct generic_pm_domain *genpd) if (scpd->data->bus_prot_mask) { ret = mtk_infracfg_clear_bus_protection(scp->infracfg, - scpd->data->bus_prot_mask); + scpd->data->bus_prot_mask, + scp->bus_prot_reg_update); if (ret) goto err_pwr_ack; } @@ -289,7 +292,8 @@ static int scpsys_power_off(struct generic_pm_domain *genpd) if (scpd->data->bus_prot_mask) { ret = mtk_infracfg_set_bus_protection(scp->infracfg, - scpd->data->bus_prot_mask); + scpd->data->bus_prot_mask, + scp->bus_prot_reg_update); if (ret) goto out; } @@ -371,7 +375,8 @@ static void init_clks(struct platform_device *pdev, struct clk **clk) static struct scp *init_scp(struct platform_device *pdev, const struct scp_domain_data *scp_domain_data, int num, - const struct scp_ctrl_reg *scp_ctrl_reg) + const struct scp_ctrl_reg *scp_ctrl_reg, + bool bus_prot_reg_update) { struct genpd_onecell_data *pd_data; struct resource *res; @@ -386,6 +391,8 @@ static struct scp *init_scp(struct platform_device *pdev, scp->ctrl_reg.pwr_sta_offs = scp_ctrl_reg->pwr_sta_offs; scp->ctrl_reg.pwr_sta2nd_offs = scp_ctrl_reg->pwr_sta2nd_offs; + scp->bus_prot_reg_update = bus_prot_reg_update; + scp->dev = &pdev->dev; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -806,7 +813,8 @@ static const struct scp_soc_data mt2701_data = { .regs = { .pwr_sta_offs = SPM_PWR_STATUS, .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND - } + }, + .bus_prot_reg_update = true, }; static const struct scp_soc_data mt6797_data = { @@ -817,7 +825,8 @@ static const struct scp_soc_data mt6797_data = { .regs = { .pwr_sta_offs = SPM_PWR_STATUS_MT6797, .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND_MT6797 - } + }, + .bus_prot_reg_update = true, }; static const struct scp_soc_data mt7622_data = { @@ -826,7 +835,8 @@ static const struct scp_soc_data mt7622_data = { .regs = { .pwr_sta_offs = SPM_PWR_STATUS, .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND - } + }, + .bus_prot_reg_update = true, }; static const struct scp_soc_data mt8173_data = { @@ -837,7 +847,8 @@ static const struct scp_soc_data mt8173_data = { .regs = { .pwr_sta_offs = SPM_PWR_STATUS, .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND - } + }, + .bus_prot_reg_update = true, }; /* @@ -874,7 +885,8 @@ static int scpsys_probe(struct platform_device *pdev) match = of_match_device(of_scpsys_match_tbl, &pdev->dev); soc = (const struct scp_soc_data *)match->data; - scp = init_scp(pdev, soc->domains, soc->num_domains, &soc->regs); + scp = init_scp(pdev, soc->domains, soc->num_domains, &soc->regs, + soc->bus_prot_reg_update); if (IS_ERR(scp)) return PTR_ERR(scp); diff --git a/include/linux/soc/mediatek/infracfg.h b/include/linux/soc/mediatek/infracfg.h index e8d9f0d..b0a507d 100644 --- a/include/linux/soc/mediatek/infracfg.h +++ b/include/linux/soc/mediatek/infracfg.h @@ -28,7 +28,8 @@ #define MT7622_TOP_AXI_PROT_EN_WB (BIT(2) | BIT(6) | \ BIT(7) | BIT(8)) -int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask); -int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask); - +int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask, + bool reg_update); +int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask, + bool reg_update); #endif /* __SOC_MEDIATEK_INFRACFG_H */ -- 2.7.4