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clk: sunxi-ng: r40: export a regmap to access the GMAC register 

There's a GMAC configuration register, which exists on A64/A83T/H3/H5 in
the syscon part, in the CCU of R40 SoC.

Export a regmap of the CCU.

Read access is not restricted to all registers, but only the GMAC
register is allowed to be written.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
This commit is contained in:
Icenowy Zheng 2018-05-02 00:12:14 +08:00 committed by Chen-Yu Tsai
parent c3bf29f675
commit 17de4c857b
1 changed files with 33 additions and 0 deletions
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33
drivers/clk/sunxi-ng/ccu-sun8i-r40.c
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@ -1251,9 +1251,37 @@ static struct ccu_mux_nb sun8i_r40_cpu_nb = {
.bypass_index = 1, /* index of 24 MHz oscillator */
};
/*
* Add a regmap for the GMAC driver (dwmac-sun8i) to access the
* GMAC configuration register.
* Only this register is allowed to be written, in order to
* prevent overriding critical clock configuration.
*/
#define SUN8I_R40_GMAC_CFG_REG 0x164
static bool sun8i_r40_ccu_regmap_accessible_reg(struct device *dev,
unsigned int reg)
{
if (reg == SUN8I_R40_GMAC_CFG_REG)
return true;
return false;
}
static struct regmap_config sun8i_r40_ccu_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = 0x320, /* PLL_LOCK_CTRL_REG */
/* other devices have no business accessing other registers */
.readable_reg = sun8i_r40_ccu_regmap_accessible_reg,
.writeable_reg = sun8i_r40_ccu_regmap_accessible_reg,
};
static int sun8i_r40_ccu_probe(struct platform_device *pdev)
{
struct resource *res;
struct regmap *regmap;
void __iomem *reg;
u32 val;
int ret;
@ -1278,6 +1306,11 @@ static int sun8i_r40_ccu_probe(struct platform_device *pdev)
val &= ~GENMASK(25, 20);
writel(val, reg + SUN8I_R40_USB_CLK_REG);
regmap = devm_regmap_init_mmio(&pdev->dev, reg,
&sun8i_r40_ccu_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
ret = sunxi_ccu_probe(pdev->dev.of_node, reg, &sun8i_r40_ccu_desc);
if (ret)
return ret;