diff options
Diffstat (limited to 'drivers/rtc/rtc-sun6i.c')
| -rw-r--r-- | drivers/rtc/rtc-sun6i.c | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c index dbd676db431e..956c0846201f 100644 --- a/drivers/rtc/rtc-sun6i.c +++ b/drivers/rtc/rtc-sun6i.c @@ -32,9 +32,11 @@ /* Control register */ #define SUN6I_LOSC_CTRL 0x0000 #define SUN6I_LOSC_CTRL_KEY (0x16aa << 16) +#define SUN6I_LOSC_CTRL_AUTO_SWT_BYPASS BIT(15) #define SUN6I_LOSC_CTRL_ALM_DHMS_ACC BIT(9) #define SUN6I_LOSC_CTRL_RTC_HMS_ACC BIT(8) #define SUN6I_LOSC_CTRL_RTC_YMD_ACC BIT(7) +#define SUN6I_LOSC_CTRL_EXT_LOSC_EN BIT(4) #define SUN6I_LOSC_CTRL_EXT_OSC BIT(0) #define SUN6I_LOSC_CTRL_ACC_MASK GENMASK(9, 7) @@ -128,6 +130,8 @@ struct sun6i_rtc_clk_data { unsigned int has_prescaler : 1; unsigned int has_out_clk : 1; unsigned int export_iosc : 1; + unsigned int has_losc_en : 1; + unsigned int has_auto_swt : 1; }; struct sun6i_rtc_dev { @@ -190,6 +194,10 @@ static int sun6i_rtc_osc_set_parent(struct clk_hw *hw, u8 index) val &= ~SUN6I_LOSC_CTRL_EXT_OSC; val |= SUN6I_LOSC_CTRL_KEY; val |= index ? SUN6I_LOSC_CTRL_EXT_OSC : 0; + if (rtc->data->has_losc_en) { + val &= ~SUN6I_LOSC_CTRL_EXT_LOSC_EN; + val |= index ? SUN6I_LOSC_CTRL_EXT_LOSC_EN : 0; + } writel(val, rtc->base + SUN6I_LOSC_CTRL); spin_unlock_irqrestore(&rtc->lock, flags); @@ -215,6 +223,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node, const char *iosc_name = "rtc-int-osc"; const char *clkout_name = "osc32k-out"; const char *parents[2]; + u32 reg; rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); if (!rtc) @@ -235,9 +244,18 @@ static void __init sun6i_rtc_clk_init(struct device_node *node, goto err; } + reg = SUN6I_LOSC_CTRL_KEY; + if (rtc->data->has_auto_swt) { + /* Bypass auto-switch to int osc, on ext losc failure */ + reg |= SUN6I_LOSC_CTRL_AUTO_SWT_BYPASS; + writel(reg, rtc->base + SUN6I_LOSC_CTRL); + } + /* Switch to the external, more precise, oscillator */ - writel(SUN6I_LOSC_CTRL_KEY | SUN6I_LOSC_CTRL_EXT_OSC, - rtc->base + SUN6I_LOSC_CTRL); + reg |= SUN6I_LOSC_CTRL_EXT_OSC; + if (rtc->data->has_losc_en) + reg |= SUN6I_LOSC_CTRL_EXT_LOSC_EN; + writel(reg, rtc->base + SUN6I_LOSC_CTRL); /* Yes, I know, this is ugly. */ sun6i_rtc = rtc; @@ -345,6 +363,23 @@ CLK_OF_DECLARE_DRIVER(sun8i_h3_rtc_clk, "allwinner,sun8i-h3-rtc", CLK_OF_DECLARE_DRIVER(sun50i_h5_rtc_clk, "allwinner,sun50i-h5-rtc", sun8i_h3_rtc_clk_init); +static const struct sun6i_rtc_clk_data sun50i_h6_rtc_data = { + .rc_osc_rate = 16000000, + .fixed_prescaler = 32, + .has_prescaler = 1, + .has_out_clk = 1, + .export_iosc = 1, + .has_losc_en = 1, + .has_auto_swt = 1, +}; + +static void __init sun50i_h6_rtc_clk_init(struct device_node *node) +{ + sun6i_rtc_clk_init(node, &sun50i_h6_rtc_data); +} +CLK_OF_DECLARE_DRIVER(sun50i_h6_rtc_clk, "allwinner,sun50i-h6-rtc", + sun50i_h6_rtc_clk_init); + static const struct sun6i_rtc_clk_data sun8i_v3_rtc_data = { .rc_osc_rate = 32000, .has_out_clk = 1, @@ -673,6 +708,7 @@ static const struct of_device_id sun6i_rtc_dt_ids[] = { { .compatible = "allwinner,sun8i-r40-rtc" }, { .compatible = "allwinner,sun8i-v3-rtc" }, { .compatible = "allwinner,sun50i-h5-rtc" }, + { .compatible = "allwinner,sun50i-h6-rtc" }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, sun6i_rtc_dt_ids); |