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pinctrl: pinctrl-single: Add 'pinctrl-single, bits' support

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The TI Davinci (da850/l138/am1808) use pinctrl-single,bits for
pinmuxing peripherals.  This patch allosw the pinctrl-single
driver to parse the pinctrl-single,bits options and correctly
setup devices.

Signed-off-by: Adam Ford <aford173@gmail.com>
This commit is contained in:
Adam Ford 2019-06-10 13:15:55 -05:00 committed by Tom Rini
parent 2a51e16bd5
commit 159a887e74
1 changed files with 64 additions and 1 deletions
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65
drivers/pinctrl/pinctrl-single.c
View file

@ -16,6 +16,7 @@ struct single_pdata {
int offset; /* index of last configuration register */
u32 mask; /* configuration-value mask bits */
int width; /* configuration register bit width */
bool bits_per_mux;
};
struct single_fdt_pin_cfg {
@ -23,6 +24,12 @@ struct single_fdt_pin_cfg {
fdt32_t val; /* configuration register value */
};
struct single_fdt_bits_cfg {
fdt32_t reg; /* configuration register offset */
fdt32_t val; /* configuration register value */
fdt32_t mask; /* configuration register mask */
};
/**
* single_configure_pins() - Configure pins based on FDT data
*
@ -71,15 +78,53 @@ static int single_configure_pins(struct udevice *dev,
return 0;
}
static int single_configure_bits(struct udevice *dev,
const struct single_fdt_bits_cfg *pins,
int size)
{
struct single_pdata *pdata = dev->platdata;
int count = size / sizeof(struct single_fdt_bits_cfg);
phys_addr_t n, reg;
u32 val, mask;
for (n = 0; n < count; n++, pins++) {
reg = fdt32_to_cpu(pins->reg);
if ((reg < 0) || (reg > pdata->offset)) {
dev_dbg(dev, " invalid register offset 0x%pa\n", &reg);
continue;
}
reg += pdata->base;
mask = fdt32_to_cpu(pins->mask);
val = fdt32_to_cpu(pins->val) & mask;
switch (pdata->width) {
case 16:
writew((readw(reg) & ~mask) | val, reg);
break;
case 32:
writel((readl(reg) & ~mask) | val, reg);
break;
default:
dev_warn(dev, "unsupported register width %i\n",
pdata->width);
continue;
}
dev_dbg(dev, " reg/val 0x%pa/0x%08x\n", &reg, val);
}
return 0;
}
static int single_set_state(struct udevice *dev,
struct udevice *config)
{
const void *fdt = gd->fdt_blob;
const struct single_fdt_pin_cfg *prop;
const struct single_fdt_bits_cfg *prop_bits;
int len;
prop = fdt_getprop(fdt, dev_of_offset(config), "pinctrl-single,pins",
&len);
if (prop) {
dev_dbg(dev, "configuring pins for %s\n", config->name);
if (len % sizeof(struct single_fdt_pin_cfg)) {
@ -87,9 +132,24 @@ static int single_set_state(struct udevice *dev,
return -FDT_ERR_BADSTRUCTURE;
}
single_configure_pins(dev, prop, len);
len = 0;
return 0;
}
/* pinctrl-single,pins not found so check for pinctrl-single,bits */
prop_bits = fdt_getprop(fdt, dev_of_offset(config),
"pinctrl-single,bits",
&len);
if (prop_bits) {
dev_dbg(dev, "configuring pins for %s\n", config->name);
if (len % sizeof(struct single_fdt_bits_cfg)) {
dev_dbg(dev, " invalid bits configuration in fdt\n");
return -FDT_ERR_BADSTRUCTURE;
}
single_configure_bits(dev, prop_bits, len);
return 0;
}
/* Neither 'pinctrl-single,pins' nor 'pinctrl-single,bits' were found */
return len;
}
@ -119,6 +179,9 @@ static int single_ofdata_to_platdata(struct udevice *dev)
pdata->mask = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
"pinctrl-single,function-mask",
0xffffffff);
pdata->bits_per_mux = fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
"pinctrl-single,bit-per-mux");
return 0;
}