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pinctrl: pinctrl-single: fix pcs_pin_dbg_show() when bits_per_mux is not zero

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[ Upstream commit bd85125ea88513f637a62a72e8949c579c5c0a87 ]

A System Error (SError, followed by kernel panic) was detected when
trying to print the supported pins in a pinctrl device which supports
multiple pins per register. This change fixes the pcs_pin_dbg_show() in
pinctrl-single driver when bits_per_mux is not zero. In addition move
offset calculation and pin offset in register to common function.

Fixes: 4e7e8017a8 ("pinctrl: pinctrl-single: enhance to configure multiple pins of different modules")
Signed-off-by: Hanna Hawa <hhhawa@amazon.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Drew Fustini <drew@beagleboard.org>
Link: https://lore.kernel.org/r/20210319152133.28705-4-hhhawa@amazon.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hanna Hawa 2021-03-19 17:21:33 +02:00 committed by Greg Kroah-Hartman
parent 353fcebf49
commit da40d5fec5
1 changed files with 35 additions and 20 deletions
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55
drivers/pinctrl/pinctrl-single.c
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@ -270,20 +270,44 @@ static void __maybe_unused pcs_writel(unsigned val, void __iomem *reg)
writel(val, reg);
}
static unsigned int pcs_pin_reg_offset_get(struct pcs_device *pcs,
unsigned int pin)
{
unsigned int mux_bytes = pcs->width / BITS_PER_BYTE;
if (pcs->bits_per_mux) {
unsigned int pin_offset_bytes;
pin_offset_bytes = (pcs->bits_per_pin * pin) / BITS_PER_BYTE;
return (pin_offset_bytes / mux_bytes) * mux_bytes;
}
return pin * mux_bytes;
}
static unsigned int pcs_pin_shift_reg_get(struct pcs_device *pcs,
unsigned int pin)
{
return (pin % (pcs->width / pcs->bits_per_pin)) * pcs->bits_per_pin;
}
static void pcs_pin_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s,
unsigned pin)
{
struct pcs_device *pcs;
unsigned val, mux_bytes;
unsigned int val;
unsigned long offset;
size_t pa;
pcs = pinctrl_dev_get_drvdata(pctldev);
mux_bytes = pcs->width / BITS_PER_BYTE;
offset = pin * mux_bytes;
offset = pcs_pin_reg_offset_get(pcs, pin);
val = pcs->read(pcs->base + offset);
if (pcs->bits_per_mux)
val &= pcs->fmask << pcs_pin_shift_reg_get(pcs, pin);
pa = pcs->res->start + offset;
seq_printf(s, "%zx %08x %s ", pa, val, DRIVER_NAME);
@ -384,7 +408,6 @@ static int pcs_request_gpio(struct pinctrl_dev *pctldev,
struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
struct pcs_gpiofunc_range *frange = NULL;
struct list_head *pos, *tmp;
int mux_bytes = 0;
unsigned data;
/* If function mask is null, return directly. */
@ -392,29 +415,27 @@ static int pcs_request_gpio(struct pinctrl_dev *pctldev,
return -ENOTSUPP;
list_for_each_safe(pos, tmp, &pcs->gpiofuncs) {
u32 offset;
frange = list_entry(pos, struct pcs_gpiofunc_range, node);
if (pin >= frange->offset + frange->npins
|| pin < frange->offset)
continue;
mux_bytes = pcs->width / BITS_PER_BYTE;
offset = pcs_pin_reg_offset_get(pcs, pin);
if (pcs->bits_per_mux) {
int byte_num, offset, pin_shift;
byte_num = (pcs->bits_per_pin * pin) / BITS_PER_BYTE;
offset = (byte_num / mux_bytes) * mux_bytes;
pin_shift = pin % (pcs->width / pcs->bits_per_pin) *
pcs->bits_per_pin;
int pin_shift = pcs_pin_shift_reg_get(pcs, pin);
data = pcs->read(pcs->base + offset);
data &= ~(pcs->fmask << pin_shift);
data |= frange->gpiofunc << pin_shift;
pcs->write(data, pcs->base + offset);
} else {
data = pcs->read(pcs->base + pin * mux_bytes);
data = pcs->read(pcs->base + offset);
data &= ~pcs->fmask;
data |= frange->gpiofunc;
pcs->write(data, pcs->base + pin * mux_bytes);
pcs->write(data, pcs->base + offset);
}
break;
}
@ -726,14 +747,8 @@ 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;
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;
}
offset = pcs_pin_reg_offset_get(pcs, i);
res = pcs_add_pin(pcs, offset);
if (res < 0) {
dev_err(pcs->dev, "error adding pins: %i\n", res);