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soc: sunxi: export a regmap for EMAC clock reg on A64 

The A64 SRAM controller memory zone has a EMAC clock register, which is
needed by the Ethernet MAC driver (dwmac-sun8i).

Export a regmap for this register on A64.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
[wens@csie.org: export whole address range with only EMAC register
		accessible and drop regmap name]
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
hifive-unleashed-5.1
Icenowy Zheng 2018-04-11 22:16:40 +08:00 committed by Chen-Yu Tsai
parent ce397d215c
commit 5828729beb
1 changed files with 55 additions and 2 deletions
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57
drivers/soc/sunxi/sunxi_sram.c
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@ -17,6 +17,7 @@
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/soc/sunxi/sunxi_sram.h>
@ -281,13 +282,51 @@ int sunxi_sram_release(struct device *dev)
}
EXPORT_SYMBOL(sunxi_sram_release);
struct sunxi_sramc_variant {
bool has_emac_clock;
};
static const struct sunxi_sramc_variant sun4i_a10_sramc_variant = {
/* Nothing special */
};
static const struct sunxi_sramc_variant sun50i_a64_sramc_variant = {
.has_emac_clock = true,
};
#define SUNXI_SRAM_EMAC_CLOCK_REG 0x30
static bool sunxi_sram_regmap_accessible_reg(struct device *dev,
unsigned int reg)
{
if (reg == SUNXI_SRAM_EMAC_CLOCK_REG)
return true;
return false;
}
static struct regmap_config sunxi_sram_emac_clock_regmap = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
/* last defined register */
.max_register = SUNXI_SRAM_EMAC_CLOCK_REG,
/* other devices have no business accessing other registers */
.readable_reg = sunxi_sram_regmap_accessible_reg,
.writeable_reg = sunxi_sram_regmap_accessible_reg,
};
static int sunxi_sram_probe(struct platform_device *pdev)
{
struct resource *res;
struct dentry *d;
struct regmap *emac_clock;
const struct sunxi_sramc_variant *variant;
sram_dev = &pdev->dev;
variant = of_device_get_match_data(&pdev->dev);
if (!variant)
return -EINVAL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
@ -300,12 +339,26 @@ static int sunxi_sram_probe(struct platform_device *pdev)
if (!d)
return -ENOMEM;
if (variant->has_emac_clock) {
emac_clock = devm_regmap_init_mmio(&pdev->dev, base,
&sunxi_sram_emac_clock_regmap);
if (IS_ERR(emac_clock))
return PTR_ERR(emac_clock);
}
return 0;
}
static const struct of_device_id sunxi_sram_dt_match[] = {
{ .compatible = "allwinner,sun4i-a10-sram-controller" },
{ .compatible = "allwinner,sun50i-a64-sram-controller" },
{
.compatible = "allwinner,sun4i-a10-sram-controller",
.data = &sun4i_a10_sramc_variant,
},
{
.compatible = "allwinner,sun50i-a64-sram-controller",
.data = &sun50i_a64_sramc_variant,
},
{ },
};
MODULE_DEVICE_TABLE(of, sunxi_sram_dt_match);