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gpio: stmpe: Add STMPE1600 support

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The particularities of this variant are:
- GPIO_XXX_LSB and GPIO_XXX_MSB memory locations are inverted compared
  to other variants.
- There is no Edge detection, Rising Edge and Falling Edge registers.
- IRQ flags are cleared when read, no need to write in Status register.

Signed-off-by: Amelie DELAUNAY <amelie.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Patrice Chotard 2016-08-10 09:39:15 +02:00 committed by Lee Jones
parent 6bb9f0d933
commit c6a05a0563
1 changed files with 38 additions and 10 deletions
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48
drivers/gpio/gpio-stmpe.c
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@ -144,8 +144,9 @@ static int stmpe_gpio_irq_set_type(struct irq_data *d, unsigned int type)
if (type & IRQ_TYPE_LEVEL_LOW || type & IRQ_TYPE_LEVEL_HIGH)
return -EINVAL;
/* STMPE801 doesn't have RE and FE registers */
if (stmpe_gpio->stmpe->partnum == STMPE801)
/* STMPE801 and STMPE 1600 don't have RE and FE registers */
if (stmpe_gpio->stmpe->partnum == STMPE801 ||
stmpe_gpio->stmpe->partnum == STMPE1600)
return 0;
if (type & IRQ_TYPE_EDGE_RISING)
@ -189,9 +190,10 @@ static void stmpe_gpio_irq_sync_unlock(struct irq_data *d)
int i, j;
for (i = 0; i < CACHE_NR_REGS; i++) {
/* STMPE801 doesn't have RE and FE registers */
if ((stmpe->partnum == STMPE801) &&
(i != REG_IE))
/* STMPE801 and STMPE1600 don't have RE and FE registers */
if ((stmpe->partnum == STMPE801 ||
stmpe->partnum == STMPE1600) &&
(i != REG_IE))
continue;
for (j = 0; j < num_banks; j++) {
@ -224,11 +226,21 @@ static void stmpe_gpio_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct stmpe_gpio *stmpe_gpio = gpiochip_get_data(gc);
struct stmpe *stmpe = stmpe_gpio->stmpe;
int offset = d->hwirq;
int regoffset = offset / 8;
int mask = 1 << (offset % 8);
stmpe_gpio->regs[REG_IE][regoffset] |= mask;
/*
* STMPE1600 workaround: to be able to get IRQ from pins,
* a read must be done on GPMR register, or a write in
* GPSR or GPCR registers
*/
if (stmpe->partnum == STMPE1600)
stmpe_reg_read(stmpe,
stmpe->regs[STMPE_IDX_GPMR_LSB + regoffset]);
}
static void stmpe_dbg_show_one(struct seq_file *s,
@ -301,6 +313,7 @@ static void stmpe_dbg_show_one(struct seq_file *s,
fall = !!(ret & mask);
case STMPE801:
case STMPE1600:
irqen_reg = stmpe->regs[STMPE_IDX_IEGPIOR_LSB + bank];
break;
@ -347,18 +360,32 @@ static irqreturn_t stmpe_gpio_irq(int irq, void *dev)
{
struct stmpe_gpio *stmpe_gpio = dev;
struct stmpe *stmpe = stmpe_gpio->stmpe;
u8 statmsbreg = stmpe->regs[STMPE_IDX_ISGPIOR_MSB];
u8 statmsbreg;
int num_banks = DIV_ROUND_UP(stmpe->num_gpios, 8);
u8 status[num_banks];
int ret;
int i;
/*
* the stmpe_block_read() call below, imposes to set statmsbreg
* with the register located at the lowest address. As STMPE1600
* variant is the only one which respect registers address's order
* (LSB regs located at lowest address than MSB ones) whereas all
* the others have a registers layout with MSB located before the
* LSB regs.
*/
if (stmpe->partnum == STMPE1600)
statmsbreg = stmpe->regs[STMPE_IDX_ISGPIOR_LSB];
else
statmsbreg = stmpe->regs[STMPE_IDX_ISGPIOR_MSB];
ret = stmpe_block_read(stmpe, statmsbreg, num_banks, status);
if (ret < 0)
return IRQ_NONE;
for (i = 0; i < num_banks; i++) {
int bank = num_banks - i - 1;
int bank = (stmpe_gpio->stmpe->partnum == STMPE1600) ? i :
num_banks - i - 1;
unsigned int enabled = stmpe_gpio->regs[REG_IE][bank];
unsigned int stat = status[i];
@ -378,10 +405,11 @@ static irqreturn_t stmpe_gpio_irq(int irq, void *dev)
/*
* interrupt status register write has no effect on
* 801 and 1801, bits are cleared when read.
* Edge detect register is not present on 801 and 1801
* 801/1801/1600, bits are cleared when read.
* Edge detect register is not present on 801/1600/1801
*/
if (stmpe->partnum != STMPE801 || stmpe->partnum != STMPE1801) {
if (stmpe->partnum != STMPE801 || stmpe->partnum != STMPE1600 ||
stmpe->partnum != STMPE1801) {
stmpe_reg_write(stmpe, statmsbreg + i, status[i]);
stmpe_reg_write(stmpe,
stmpe->regs[STMPE_IDX_GPEDR_LSB + i],