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pinctrl: pinctrl-single: enhance to configure multiple pins of different modules 

Add support to configure multiple pins in each register, existing
implementation added by [1] does not support full fledge multiple pin
configuration in single register, reports a pin clash when different
modules configure different bits of same register. The issue reported
and discussed here
http://www.spinics.net/lists/arm-kernel/msg235213.html

With pinctrl-single,bits-per-mux property specified, use function-mask
property to find out number pins to configure. Allocate and register
pin control functions based sub mask.

Tested on da850/omap-l138 EVM.
does not support variable submask for pins.
does not support pinconf.

[1] "pinctrl: pinctrl-single: Add pinctrl-single,bits type of mux"
(9e605cb68a),

Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
Reported-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Tested-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Manjunathappa, Prakash 2013-05-21 19:38:00 +05:30 committed by Linus Walleij
parent ac844b6271
commit 4e7e8017a8
2 changed files with 167 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt
View File

@ -18,7 +18,8 @@ Optional properties:
pin functions is ignored
- pinctrl-single,bit-per-mux : boolean to indicate that one register controls
more than one pin
more than one pin, for which "pinctrl-single,function-mask" property specifies
position mask of pin.
- pinctrl-single,drive-strength : array of value that are used to configure
drive strength in the pinmux register. They're value of drive strength

198
drivers/pinctrl/pinctrl-single.c
View File

@ -163,6 +163,7 @@ struct pcs_name {
* @foff: value to turn mux off
* @fmax: max number of functions in fmask
* @is_pinconf: whether supports pinconf
* @bits_per_pin:number of bits per pin
* @names: array of register names for pins
* @pins: physical pins on the SoC
* @pgtree: pingroup index radix tree
@ -190,6 +191,7 @@ struct pcs_device {
unsigned fmax;
bool bits_per_mux;
bool is_pinconf;
unsigned bits_per_pin;
struct pcs_name *names;
struct pcs_data pins;
struct radix_tree_root pgtree;
@ -431,10 +433,11 @@ static int pcs_enable(struct pinctrl_dev *pctldev, unsigned fselector,
vals = &func->vals[i];
val = pcs->read(vals->reg);
if (!vals->mask)
mask = pcs->fmask;
if (pcs->bits_per_mux)
mask = vals->mask;
else
mask = pcs->fmask & vals->mask;
mask = pcs->fmask;
val &= ~mask;
val |= (vals->val & mask);
@ -779,7 +782,13 @@ static int pcs_allocate_pin_table(struct pcs_device *pcs)
int mux_bytes, nr_pins, i;
mux_bytes = pcs->width / BITS_PER_BYTE;
nr_pins = pcs->size / mux_bytes;
if (pcs->bits_per_mux) {
pcs->bits_per_pin = fls(pcs->fmask);
nr_pins = (pcs->size * BITS_PER_BYTE) / pcs->bits_per_pin;
} else {
nr_pins = pcs->size / mux_bytes;
}
dev_dbg(pcs->dev, "allocating %i pins\n", nr_pins);
pcs->pins.pa = devm_kzalloc(pcs->dev,
@ -800,8 +809,14 @@ static int pcs_allocate_pin_table(struct pcs_device *pcs)
for (i = 0; i < pcs->desc.npins; i++) {
unsigned offset;
int res;
int byte_num;
offset = i * mux_bytes;
if (pcs->bits_per_mux) {
byte_num = (pcs->bits_per_pin * i) / BITS_PER_BYTE;
offset = (byte_num / mux_bytes) * mux_bytes;
} else {
offset = i * mux_bytes;
}
res = pcs_add_pin(pcs, offset);
if (res < 0) {
dev_err(pcs->dev, "error adding pins: %i\n", res);
@ -919,7 +934,10 @@ static int pcs_get_pin_by_offset(struct pcs_device *pcs, unsigned offset)
return -EINVAL;
}
index = offset / (pcs->width / BITS_PER_BYTE);
if (pcs->bits_per_mux)
index = (offset * BITS_PER_BYTE) / pcs->bits_per_pin;
else
index = offset / (pcs->width / BITS_PER_BYTE);
return index;
}
@ -1097,29 +1115,18 @@ static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
{
struct pcs_func_vals *vals;
const __be32 *mux;
int size, params, rows, *pins, index = 0, found = 0, res = -ENOMEM;
int size, rows, *pins, index = 0, found = 0, res = -ENOMEM;
struct pcs_function *function;
if (pcs->bits_per_mux) {
params = 3;
mux = of_get_property(np, PCS_MUX_BITS_NAME, &size);
} else {
params = 2;
mux = of_get_property(np, PCS_MUX_PINS_NAME, &size);
}
if (!mux) {
dev_err(pcs->dev, "no valid property for %s\n", np->name);
return -EINVAL;
}
if (size < (sizeof(*mux) * params)) {
dev_err(pcs->dev, "bad data for %s\n", np->name);
mux = of_get_property(np, PCS_MUX_PINS_NAME, &size);
if ((!mux) || (size < sizeof(*mux) * 2)) {
dev_err(pcs->dev, "bad data for mux %s\n",
np->name);
return -EINVAL;
}
size /= sizeof(*mux); /* Number of elements in array */
rows = size / params;
rows = size / 2;
vals = devm_kzalloc(pcs->dev, sizeof(*vals) * rows, GFP_KERNEL);
if (!vals)
@ -1137,10 +1144,6 @@ static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
val = be32_to_cpup(mux + index++);
vals[found].reg = pcs->base + offset;
vals[found].val = val;
if (params == 3) {
val = be32_to_cpup(mux + index++);
vals[found].mask = val;
}
pin = pcs_get_pin_by_offset(pcs, offset);
if (pin < 0) {
@ -1184,6 +1187,125 @@ free_function:
free_pins:
devm_kfree(pcs->dev, pins);
free_vals:
devm_kfree(pcs->dev, vals);
return res;
}
#define PARAMS_FOR_BITS_PER_MUX 3
static int pcs_parse_bits_in_pinctrl_entry(struct pcs_device *pcs,
struct device_node *np,
struct pinctrl_map **map,
unsigned *num_maps,
const char **pgnames)
{
struct pcs_func_vals *vals;
const __be32 *mux;
int size, rows, *pins, index = 0, found = 0, res = -ENOMEM;
int npins_in_row;
struct pcs_function *function;
mux = of_get_property(np, PCS_MUX_BITS_NAME, &size);
if (!mux) {
dev_err(pcs->dev, "no valid property for %s\n", np->name);
return -EINVAL;
}
if (size < (sizeof(*mux) * PARAMS_FOR_BITS_PER_MUX)) {
dev_err(pcs->dev, "bad data for %s\n", np->name);
return -EINVAL;
}
/* Number of elements in array */
size /= sizeof(*mux);
rows = size / PARAMS_FOR_BITS_PER_MUX;
npins_in_row = pcs->width / pcs->bits_per_pin;
vals = devm_kzalloc(pcs->dev, sizeof(*vals) * rows * npins_in_row,
GFP_KERNEL);
if (!vals)
return -ENOMEM;
pins = devm_kzalloc(pcs->dev, sizeof(*pins) * rows * npins_in_row,
GFP_KERNEL);
if (!pins)
goto free_vals;
while (index < size) {
unsigned offset, val;
unsigned mask, bit_pos, val_pos, mask_pos, submask;
unsigned pin_num_from_lsb;
int pin;
offset = be32_to_cpup(mux + index++);
val = be32_to_cpup(mux + index++);
mask = be32_to_cpup(mux + index++);
/* Parse pins in each row from LSB */
while (mask) {
bit_pos = ffs(mask);
pin_num_from_lsb = bit_pos / pcs->bits_per_pin;
mask_pos = ((pcs->fmask) << (bit_pos - 1));
val_pos = val & mask_pos;
submask = mask & mask_pos;
mask &= ~mask_pos;
if (submask != mask_pos) {
dev_warn(pcs->dev,
"Invalid submask 0x%x for %s at 0x%x\n",
submask, np->name, offset);
continue;
}
vals[found].mask = submask;
vals[found].reg = pcs->base + offset;
vals[found].val = val_pos;
pin = pcs_get_pin_by_offset(pcs, offset);
if (pin < 0) {
dev_err(pcs->dev,
"could not add functions for %s %ux\n",
np->name, offset);
break;
}
pins[found++] = pin + pin_num_from_lsb;
}
}
pgnames[0] = np->name;
function = pcs_add_function(pcs, np, np->name, vals, found, pgnames, 1);
if (!function)
goto free_pins;
res = pcs_add_pingroup(pcs, np, np->name, pins, found);
if (res < 0)
goto free_function;
(*map)->type = PIN_MAP_TYPE_MUX_GROUP;
(*map)->data.mux.group = np->name;
(*map)->data.mux.function = np->name;
if (pcs->is_pinconf) {
dev_err(pcs->dev, "pinconf not supported\n");
goto free_pingroups;
}
*num_maps = 1;
return 0;
free_pingroups:
pcs_free_pingroups(pcs);
*num_maps = 1;
free_function:
pcs_remove_function(pcs, function);
free_pins:
devm_kfree(pcs->dev, pins);
free_vals:
devm_kfree(pcs->dev, vals);
@ -1219,12 +1341,22 @@ static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
goto free_map;
}
ret = pcs_parse_one_pinctrl_entry(pcs, np_config, map, num_maps,
pgnames);
if (ret < 0) {
dev_err(pcs->dev, "no pins entries for %s\n",
np_config->name);
goto free_pgnames;
if (pcs->bits_per_mux) {
ret = pcs_parse_bits_in_pinctrl_entry(pcs, np_config, map,
num_maps, pgnames);
if (ret < 0) {
dev_err(pcs->dev, "no pins entries for %s\n",
np_config->name);
goto free_pgnames;
}
} else {
ret = pcs_parse_one_pinctrl_entry(pcs, np_config, map,
num_maps, pgnames);
if (ret < 0) {
dev_err(pcs->dev, "no pins entries for %s\n",
np_config->name);
goto free_pgnames;
}
}
return 0;