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sh: pfc: Add config_reg_helper() function

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Add a helper function for shared config reg access
calculations. This allows us to reduce the amount
of duplicated code, and at the same time prepare
for a common place for future variable bitwidth
config reg support.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2011-12-14 01:00:55 +09:00 committed by Paul Mundt
parent ad4a07ff8d
commit 18925e118b
1 changed files with 35 additions and 47 deletions
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82
drivers/sh/pfc.c
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@ -167,41 +167,52 @@ static void gpio_write_bit(struct pinmux_data_reg *dr,
gpio_write_raw_reg(dr->mapped_reg, dr->reg_width, dr->reg_shadow); gpio_write_raw_reg(dr->mapped_reg, dr->reg_width, dr->reg_shadow);
} }
static int gpio_read_reg(void __iomem *mapped_reg, unsigned long reg_width, static void config_reg_helper(struct pinmux_info *gpioc,
unsigned long field_width, unsigned long in_pos, struct pinmux_cfg_reg *crp,
unsigned long reg) unsigned long in_pos,
void __iomem **mapped_regp,
unsigned long *maskp,
unsigned long *posp)
{ {
unsigned long data, mask, pos; *mapped_regp = pfc_phys_to_virt(gpioc, crp->reg);
data = 0; *maskp = (1 << crp->field_width) - 1;
mask = (1 << field_width) - 1; *posp = crp->reg_width - ((in_pos + 1) * crp->field_width);
pos = reg_width - ((in_pos + 1) * field_width);
pr_debug("read_reg: addr = %lx, pos = %ld, "
"r_width = %ld, f_width = %ld\n",
reg, pos, reg_width, field_width);
data = gpio_read_raw_reg(mapped_reg, reg_width);
return (data >> pos) & mask;
} }
static void gpio_write_reg(void __iomem *mapped_reg, unsigned long reg_width, static int read_config_reg(struct pinmux_info *gpioc,
unsigned long field_width, unsigned long in_pos, struct pinmux_cfg_reg *crp,
unsigned long value, unsigned long reg) unsigned long field)
{ {
void __iomem *mapped_reg;
unsigned long mask, pos; unsigned long mask, pos;
mask = (1 << field_width) - 1; config_reg_helper(gpioc, crp, field, &mapped_reg, &mask, &pos);
pos = reg_width - ((in_pos + 1) * field_width);
pr_debug("write_reg addr = %lx, value = %ld, pos = %ld, " pr_debug("read_reg: addr = %lx, field = %ld, "
"r_width = %ld, f_width = %ld\n", "r_width = %ld, f_width = %ld\n",
reg, value, pos, reg_width, field_width); crp->reg, field, crp->reg_width, crp->field_width);
return (gpio_read_raw_reg(mapped_reg, crp->reg_width) >> pos) & mask;
}
static void write_config_reg(struct pinmux_info *gpioc,
struct pinmux_cfg_reg *crp,
unsigned long field, unsigned long value)
{
void __iomem *mapped_reg;
unsigned long mask, pos;
config_reg_helper(gpioc, crp, field, &mapped_reg, &mask, &pos);
pr_debug("write_reg addr = %lx, value = %ld, field = %ld, "
"r_width = %ld, f_width = %ld\n",
crp->reg, value, field, crp->reg_width, crp->field_width);
mask = ~(mask << pos); mask = ~(mask << pos);
value = value << pos; value = value << pos;
switch (reg_width) { switch (crp->reg_width) {
case 8: case 8:
iowrite8((ioread8(mapped_reg) & mask) | value, mapped_reg); iowrite8((ioread8(mapped_reg) & mask) | value, mapped_reg);
break; break;
@ -349,29 +360,6 @@ static int get_gpio_enum_id(struct pinmux_info *gpioc, unsigned gpio,
return -1; return -1;
} }
static void write_config_reg(struct pinmux_info *gpioc,
struct pinmux_cfg_reg *crp,
int field, int value)
{
void __iomem *mapped_reg = pfc_phys_to_virt(gpioc, crp->reg);
gpio_write_reg(mapped_reg, crp->reg_width, crp->field_width,
field, value, crp->reg);
}
static int check_config_reg(struct pinmux_info *gpioc,
struct pinmux_cfg_reg *crp,
int field, int value)
{
void __iomem *mapped_reg = pfc_phys_to_virt(gpioc, crp->reg);
if (gpio_read_reg(mapped_reg, crp->reg_width,
crp->field_width, field, crp->reg) == value)
return 0;
return -1;
}
enum { GPIO_CFG_DRYRUN, GPIO_CFG_REQ, GPIO_CFG_FREE }; enum { GPIO_CFG_DRYRUN, GPIO_CFG_REQ, GPIO_CFG_FREE };
static int pinmux_config_gpio(struct pinmux_info *gpioc, unsigned gpio, static int pinmux_config_gpio(struct pinmux_info *gpioc, unsigned gpio,
@ -465,8 +453,8 @@ static int pinmux_config_gpio(struct pinmux_info *gpioc, unsigned gpio,
switch (cfg_mode) { switch (cfg_mode) {
case GPIO_CFG_DRYRUN: case GPIO_CFG_DRYRUN:
if (!*cntp || !check_config_reg(gpioc, cr, if (!*cntp ||
field, value)) (read_config_reg(gpioc, cr, field) != value))
continue; continue;
break; break;