drm/sun4i: tcon-top: Add helpers for mux switching

We want to be able to set TCON TOP muxes at runtime. Add helpers for
that.

Old, static configuration of muxes at probe time is preserved for now.
It will be removed when R40 TCON starts using them.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180710203511.18454-12-jernej.skrabec@siol.net

diff --git a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
index ab2591a92ef0a78395c93a9f8857f77e5932f2a7..14add8801cda8118aaf9a3c55ee96f8468d92683 100644 (file)
--- a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
+++ b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
@@ -14,6 +14,79 @@
 
 #include "sun8i_tcon_top.h"
 
+static bool sun8i_tcon_top_node_is_tcon_top(struct device_node *node)
+{
+       return !!of_match_node(sun8i_tcon_top_of_table, node);
+}
+
+int sun8i_tcon_top_set_hdmi_src(struct device *dev, int tcon)
+{
+       struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev);
+       unsigned long flags;
+       u32 val;
+
+       if (!sun8i_tcon_top_node_is_tcon_top(dev->of_node)) {
+               dev_err(dev, "Device is not TCON TOP!\n");
+               return -EINVAL;
+       }
+
+       if (tcon < 2 || tcon > 3) {
+               dev_err(dev, "TCON index must be 2 or 3!\n");
+               return -EINVAL;
+       }
+
+       spin_lock_irqsave(&tcon_top->reg_lock, flags);
+
+       val = readl(tcon_top->regs + TCON_TOP_GATE_SRC_REG);
+       val &= ~TCON_TOP_HDMI_SRC_MSK;
+       val |= FIELD_PREP(TCON_TOP_HDMI_SRC_MSK, tcon - 1);
+       writel(val, tcon_top->regs + TCON_TOP_GATE_SRC_REG);
+
+       spin_unlock_irqrestore(&tcon_top->reg_lock, flags);
+
+       return 0;
+}
+EXPORT_SYMBOL(sun8i_tcon_top_set_hdmi_src);
+
+int sun8i_tcon_top_de_config(struct device *dev, int mixer, int tcon)
+{
+       struct sun8i_tcon_top *tcon_top = dev_get_drvdata(dev);
+       unsigned long flags;
+       u32 reg;
+
+       if (!sun8i_tcon_top_node_is_tcon_top(dev->of_node)) {
+               dev_err(dev, "Device is not TCON TOP!\n");
+               return -EINVAL;
+       }
+
+       if (mixer > 1) {
+               dev_err(dev, "Mixer index is too high!\n");
+               return -EINVAL;
+       }
+
+       if (tcon > 3) {
+               dev_err(dev, "TCON index is too high!\n");
+               return -EINVAL;
+       }
+
+       spin_lock_irqsave(&tcon_top->reg_lock, flags);
+
+       reg = readl(tcon_top->regs + TCON_TOP_PORT_SEL_REG);
+       if (mixer == 0) {
+               reg &= ~TCON_TOP_PORT_DE0_MSK;
+               reg |= FIELD_PREP(TCON_TOP_PORT_DE0_MSK, tcon);
+       } else {
+               reg &= ~TCON_TOP_PORT_DE1_MSK;
+               reg |= FIELD_PREP(TCON_TOP_PORT_DE1_MSK, tcon);
+       }
+       writel(reg, tcon_top->regs + TCON_TOP_PORT_SEL_REG);
+
+       spin_unlock_irqrestore(&tcon_top->reg_lock, flags);
+
+       return 0;
+}
+EXPORT_SYMBOL(sun8i_tcon_top_de_config);
+
 static int sun8i_tcon_top_get_connected_ep_id(struct device_node *node,
                                              int port_id)
 {
@@ -109,6 +182,7 @@ static int sun8i_tcon_top_bind(struct device *dev, struct device *master,
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        regs = devm_ioremap_resource(dev, res);
+       tcon_top->regs = regs;
        if (IS_ERR(regs))
                return PTR_ERR(regs);
 

diff --git a/drivers/gpu/drm/sun4i/sun8i_tcon_top.h b/drivers/gpu/drm/sun4i/sun8i_tcon_top.h
index 39838bbfeaee9938aa5ff796d1fecd7c9a18b5f1..0390584a330e50bd8cc2c9c418f6d9361f930db7 100644 (file)
--- a/drivers/gpu/drm/sun4i/sun8i_tcon_top.h
+++ b/drivers/gpu/drm/sun4i/sun8i_tcon_top.h
@@ -26,6 +26,7 @@
 struct sun8i_tcon_top {
        struct clk                      *bus;
        struct clk_hw_onecell_data      *clk_data;
+       void __iomem                    *regs;
        struct reset_control            *rst;
 
        /*
@@ -37,4 +38,7 @@ struct sun8i_tcon_top {
 
 extern const struct of_device_id sun8i_tcon_top_of_table[];
 
+int sun8i_tcon_top_set_hdmi_src(struct device *dev, int tcon);
+int sun8i_tcon_top_de_config(struct device *dev, int mixer, int tcon);
+
 #endif /* _SUN8I_TCON_TOP_H_ */