diff options
Diffstat (limited to 'drivers/memory/mtk-smi.c')
| -rw-r--r-- | drivers/memory/mtk-smi.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c index 5ebd7176f133..8da7aef27765 100644 --- a/drivers/memory/mtk-smi.c +++ b/drivers/memory/mtk-smi.c @@ -8,6 +8,7 @@ #include <linux/device.h> #include <linux/err.h> #include <linux/io.h> +#include <linux/iopoll.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> @@ -32,6 +33,10 @@ #define SMI_DUMMY 0x444 /* SMI LARB */ +#define SMI_LARB_SLP_CON 0xc +#define SLP_PROT_EN BIT(0) +#define SLP_PROT_RDY BIT(16) + #define SMI_LARB_CMD_THRT_CON 0x24 #define SMI_LARB_THRT_RD_NU_LMT_MSK GENMASK(7, 4) #define SMI_LARB_THRT_RD_NU_LMT (5 << 4) @@ -81,6 +86,7 @@ #define MTK_SMI_FLAG_THRT_UPDATE BIT(0) #define MTK_SMI_FLAG_SW_FLAG BIT(1) +#define MTK_SMI_FLAG_SLEEP_CTL BIT(2) #define MTK_SMI_CAPS(flags, _x) (!!((flags) & (_x))) struct mtk_smi_reg_pair { @@ -371,6 +377,26 @@ static const struct of_device_id mtk_smi_larb_of_ids[] = { {} }; +static int mtk_smi_larb_sleep_ctrl_enable(struct mtk_smi_larb *larb) +{ + int ret; + u32 tmp; + + writel_relaxed(SLP_PROT_EN, larb->base + SMI_LARB_SLP_CON); + ret = readl_poll_timeout_atomic(larb->base + SMI_LARB_SLP_CON, + tmp, !!(tmp & SLP_PROT_RDY), 10, 1000); + if (ret) { + /* TODO: Reset this larb if it fails here. */ + dev_err(larb->smi.dev, "sleep ctrl is not ready(0x%x).\n", tmp); + } + return ret; +} + +static void mtk_smi_larb_sleep_ctrl_disable(struct mtk_smi_larb *larb) +{ + writel_relaxed(0, larb->base + SMI_LARB_SLP_CON); +} + static int mtk_smi_device_link_common(struct device *dev, struct device **com_dev) { struct platform_device *smi_com_pdev; @@ -483,6 +509,9 @@ static int __maybe_unused mtk_smi_larb_resume(struct device *dev) if (ret) return ret; + if (MTK_SMI_CAPS(larb->larb_gen->flags_general, MTK_SMI_FLAG_SLEEP_CTL)) + mtk_smi_larb_sleep_ctrl_disable(larb); + /* Configure the basic setting for this larb */ larb_gen->config_port(dev); @@ -492,6 +521,13 @@ static int __maybe_unused mtk_smi_larb_resume(struct device *dev) static int __maybe_unused mtk_smi_larb_suspend(struct device *dev) { struct mtk_smi_larb *larb = dev_get_drvdata(dev); + int ret; + + if (MTK_SMI_CAPS(larb->larb_gen->flags_general, MTK_SMI_FLAG_SLEEP_CTL)) { + ret = mtk_smi_larb_sleep_ctrl_enable(larb); + if (ret) + return ret; + } clk_bulk_disable_unprepare(larb->smi.clk_num, larb->smi.clks); return 0; |