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nvmem: sunxi-sid: read NVMEM size from device compatible

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Sometimes the SID device have more memory address space than the real
NVMEM size (for the registers used to read/write the SID).

Fetch the NVMEM size from device compatible, rather than the memory
address space's length, in order to prepare for adding some
registers-based read support.

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Icenowy Zheng 2017-03-31 13:44:47 +01:00 committed by Greg Kroah-Hartman
parent 5253193d54
commit 4a72cda530
1 changed files with 23 additions and 4 deletions
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27
drivers/nvmem/sunxi_sid.c
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@ -20,6 +20,7 @@
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/random.h>
@ -32,6 +33,10 @@ static struct nvmem_config econfig = {
.owner = THIS_MODULE,
};
struct sunxi_sid_cfg {
u32 size;
};
struct sunxi_sid {
void __iomem *base;
};
@ -72,18 +77,24 @@ static int sunxi_sid_probe(struct platform_device *pdev)
struct sunxi_sid *sid;
int ret, i, size;
char *randomness;
const struct sunxi_sid_cfg *cfg;
sid = devm_kzalloc(dev, sizeof(*sid), GFP_KERNEL);
if (!sid)
return -ENOMEM;
cfg = of_device_get_match_data(dev);
if (!cfg)
return -EINVAL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
sid->base = devm_ioremap_resource(dev, res);
if (IS_ERR(sid->base))
return PTR_ERR(sid->base);
size = resource_size(res) - 1;
econfig.size = resource_size(res);
size = cfg->size;
econfig.size = size;
econfig.dev = dev;
econfig.reg_read = sunxi_sid_read;
econfig.priv = sid;
@ -119,9 +130,17 @@ static int sunxi_sid_remove(struct platform_device *pdev)
return nvmem_unregister(nvmem);
}
static const struct sunxi_sid_cfg sun4i_a10_cfg = {
.size = 0x10,
};
static const struct sunxi_sid_cfg sun7i_a20_cfg = {
.size = 0x200,
};
static const struct of_device_id sunxi_sid_of_match[] = {
{ .compatible = "allwinner,sun4i-a10-sid" },
{ .compatible = "allwinner,sun7i-a20-sid" },
{ .compatible = "allwinner,sun4i-a10-sid", .data = &sun4i_a10_cfg },
{ .compatible = "allwinner,sun7i-a20-sid", .data = &sun7i_a20_cfg },
{/* sentinel */},
};
MODULE_DEVICE_TABLE(of, sunxi_sid_of_match);