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linux/drivers/pinctrl/renesas/core.c
Geert Uytterhoeven 7b1425f08f pinctrl: renesas: Protect GPIO leftovers by CONFIG_PINCTRL_SH_FUNC_GPIO 
On SuperH and ARM SH/R-Mobile SoCs, the pin control driver handles
GPIOs, too.  To reduce code size when compiling a kernel supporting only
modern SoCs, most, but not all, of the GPIO functionality is protected
by checks for CONFIG_PINCTRL_SH_FUNC_GPIO.

Factor out the remaining parts when not needed:
  1. sh_pfc_soc_info.{in,out}put describe GPIO pins that have input
     resp. output capabilities (SuperH and SH/R-Mobile).
  2. sh_pfc_soc_info.gpio_irq{,_size} describe the mapping from GPIO
     pins to interrupt numbers (SH/R-Mobile).
  3. sh_pfc_gpio_set_direction() configures GPIO direction, called from
     the GPIO driver through pinctrl_gpio_direction_{in,out}put()
     (SH/R-Mobile).  Unfortunately this function cannot just be moved to
     drivers/pinctrl/renesas/gpio.c, as it relies on knowledge of
     sh_pfc_pinctrl, which is internal to
     drivers/pinctrl/renesas/pinctrl.c.

While code size reduction is minimal, this does help in documenting
depencies.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20201028151637.1734130-9-geert+renesas@glider.be
2020-11-13 15:37:41 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Pin Control and GPIO driver for SuperH Pin Function Controller.
*
* Authors: Magnus Damm, Paul Mundt, Laurent Pinchart
*
* Copyright (C) 2008 Magnus Damm
* Copyright (C) 2009 - 2012 Paul Mundt
*/
#define DRV_NAME "sh-pfc"
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/machine.h>
#include <linux/platform_device.h>
#include <linux/psci.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include "core.h"
static int sh_pfc_map_resources(struct sh_pfc *pfc,
struct platform_device *pdev)
{
struct sh_pfc_window *windows;
unsigned int *irqs = NULL;
unsigned int num_windows;
struct resource *res;
unsigned int i;
int num_irqs;
/* Count the MEM and IRQ resources. */
for (num_windows = 0;; num_windows++) {
res = platform_get_resource(pdev, IORESOURCE_MEM, num_windows);
if (!res)
break;
}
if (num_windows == 0)
return -EINVAL;
num_irqs = platform_irq_count(pdev);
if (num_irqs < 0)
return num_irqs;
/* Allocate memory windows and IRQs arrays. */
windows = devm_kcalloc(pfc->dev, num_windows, sizeof(*windows),
GFP_KERNEL);
if (windows == NULL)
return -ENOMEM;
pfc->num_windows = num_windows;
pfc->windows = windows;
if (num_irqs) {
irqs = devm_kcalloc(pfc->dev, num_irqs, sizeof(*irqs),
GFP_KERNEL);
if (irqs == NULL)
return -ENOMEM;
pfc->num_irqs = num_irqs;
pfc->irqs = irqs;
}
/* Fill them. */
for (i = 0; i < num_windows; i++) {
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
windows->phys = res->start;
windows->size = resource_size(res);
windows->virt = devm_ioremap_resource(pfc->dev, res);
if (IS_ERR(windows->virt))
return -ENOMEM;
windows++;
}
for (i = 0; i < num_irqs; i++)
*irqs++ = platform_get_irq(pdev, i);
return 0;
}
static void __iomem *sh_pfc_phys_to_virt(struct sh_pfc *pfc, u32 reg)
{
struct sh_pfc_window *window;
phys_addr_t address = reg;
unsigned int i;
/* scan through physical windows and convert address */
for (i = 0; i < pfc->num_windows; i++) {
window = pfc->windows + i;
if (address < window->phys)
continue;
if (address >= (window->phys + window->size))
continue;
return window->virt + (address - window->phys);
}
BUG();
return NULL;
}
int sh_pfc_get_pin_index(struct sh_pfc *pfc, unsigned int pin)
{
unsigned int offset;
unsigned int i;
for (i = 0, offset = 0; i < pfc->nr_ranges; ++i) {
const struct sh_pfc_pin_range *range = &pfc->ranges[i];
if (pin <= range->end)
return pin >= range->start
? offset + pin - range->start : -1;
offset += range->end - range->start + 1;
}
return -EINVAL;
}
static int sh_pfc_enum_in_range(u16 enum_id, const struct pinmux_range *r)
{
if (enum_id < r->begin)
return 0;
if (enum_id > r->end)
return 0;
return 1;
}
u32 sh_pfc_read_raw_reg(void __iomem *mapped_reg, unsigned int reg_width)
{
switch (reg_width) {
case 8:
return ioread8(mapped_reg);
case 16:
return ioread16(mapped_reg);
case 32:
return ioread32(mapped_reg);
}
BUG();
return 0;
}
void sh_pfc_write_raw_reg(void __iomem *mapped_reg, unsigned int reg_width,
u32 data)
{
switch (reg_width) {
case 8:
iowrite8(data, mapped_reg);
return;
case 16:
iowrite16(data, mapped_reg);
return;
case 32:
iowrite32(data, mapped_reg);
return;
}
BUG();
}
u32 sh_pfc_read(struct sh_pfc *pfc, u32 reg)
{
return sh_pfc_read_raw_reg(sh_pfc_phys_to_virt(pfc, reg), 32);
}
void sh_pfc_write(struct sh_pfc *pfc, u32 reg, u32 data)
{
if (pfc->info->unlock_reg)
sh_pfc_write_raw_reg(
sh_pfc_phys_to_virt(pfc, pfc->info->unlock_reg), 32,
~data);
sh_pfc_write_raw_reg(sh_pfc_phys_to_virt(pfc, reg), 32, data);
}
static void sh_pfc_config_reg_helper(struct sh_pfc *pfc,
const struct pinmux_cfg_reg *crp,
unsigned int in_pos,
void __iomem **mapped_regp, u32 *maskp,
unsigned int *posp)
{
unsigned int k;
*mapped_regp = sh_pfc_phys_to_virt(pfc, crp->reg);
if (crp->field_width) {
*maskp = (1 << crp->field_width) - 1;
*posp = crp->reg_width - ((in_pos + 1) * crp->field_width);
} else {
*maskp = (1 << crp->var_field_width[in_pos]) - 1;
*posp = crp->reg_width;
for (k = 0; k <= in_pos; k++)
*posp -= crp->var_field_width[k];
}
}
static void sh_pfc_write_config_reg(struct sh_pfc *pfc,
const struct pinmux_cfg_reg *crp,
unsigned int field, u32 value)
{
void __iomem *mapped_reg;
unsigned int pos;
u32 mask, data;
sh_pfc_config_reg_helper(pfc, crp, field, &mapped_reg, &mask, &pos);
dev_dbg(pfc->dev, "write_reg addr = %x, value = 0x%x, field = %u, "
"r_width = %u, f_width = %u\n",
crp->reg, value, field, crp->reg_width, hweight32(mask));
mask = ~(mask << pos);
value = value << pos;
data = sh_pfc_read_raw_reg(mapped_reg, crp->reg_width);
data &= mask;
data |= value;
if (pfc->info->unlock_reg)
sh_pfc_write_raw_reg(
sh_pfc_phys_to_virt(pfc, pfc->info->unlock_reg), 32,
~data);
sh_pfc_write_raw_reg(mapped_reg, crp->reg_width, data);
}
static int sh_pfc_get_config_reg(struct sh_pfc *pfc, u16 enum_id,
const struct pinmux_cfg_reg **crp,
unsigned int *fieldp, u32 *valuep)
{
unsigned int k = 0;
while (1) {
const struct pinmux_cfg_reg *config_reg =
pfc->info->cfg_regs + k;
unsigned int r_width = config_reg->reg_width;
unsigned int f_width = config_reg->field_width;
unsigned int curr_width;
unsigned int bit_pos;
unsigned int pos = 0;
unsigned int m = 0;
if (!r_width)
break;
for (bit_pos = 0; bit_pos < r_width; bit_pos += curr_width) {
u32 ncomb;
u32 n;
if (f_width)
curr_width = f_width;
else
curr_width = config_reg->var_field_width[m];
ncomb = 1 << curr_width;
for (n = 0; n < ncomb; n++) {
if (config_reg->enum_ids[pos + n] == enum_id) {
*crp = config_reg;
*fieldp = m;
*valuep = n;
return 0;
}
}
pos += ncomb;
m++;
}
k++;
}
return -EINVAL;
}
static int sh_pfc_mark_to_enum(struct sh_pfc *pfc, u16 mark, int pos,
u16 *enum_idp)
{
const u16 *data = pfc->info->pinmux_data;
unsigned int k;
if (pos) {
*enum_idp = data[pos + 1];
return pos + 1;
}
for (k = 0; k < pfc->info->pinmux_data_size; k++) {
if (data[k] == mark) {
*enum_idp = data[k + 1];
return k + 1;
}
}
dev_err(pfc->dev, "cannot locate data/mark enum_id for mark %d\n",
mark);
return -EINVAL;
}
int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type)
{
const struct pinmux_range *range;
int pos = 0;
switch (pinmux_type) {
case PINMUX_TYPE_GPIO:
case PINMUX_TYPE_FUNCTION:
range = NULL;
break;
#ifdef CONFIG_PINCTRL_SH_PFC_GPIO
case PINMUX_TYPE_OUTPUT:
range = &pfc->info->output;
break;
case PINMUX_TYPE_INPUT:
range = &pfc->info->input;
break;
#endif /* CONFIG_PINCTRL_SH_PFC_GPIO */
default:
return -EINVAL;
}
/* Iterate over all the configuration fields we need to update. */
while (1) {
const struct pinmux_cfg_reg *cr;
unsigned int field;
u16 enum_id;
u32 value;
int in_range;
int ret;
pos = sh_pfc_mark_to_enum(pfc, mark, pos, &enum_id);
if (pos < 0)
return pos;
if (!enum_id)
break;
/* Check if the configuration field selects a function. If it
* doesn't, skip the field if it's not applicable to the
* requested pinmux type.
*/
in_range = sh_pfc_enum_in_range(enum_id, &pfc->info->function);
if (!in_range) {
if (pinmux_type == PINMUX_TYPE_FUNCTION) {
/* Functions are allowed to modify all
* fields.
*/
in_range = 1;
} else if (pinmux_type != PINMUX_TYPE_GPIO) {
/* Input/output types can only modify fields
* that correspond to their respective ranges.
*/
in_range = sh_pfc_enum_in_range(enum_id, range);
/*
* special case pass through for fixed
* input-only or output-only pins without
* function enum register association.
*/
if (in_range && enum_id == range->force)
continue;
}
/* GPIOs are only allowed to modify function fields. */
}
if (!in_range)
continue;
ret = sh_pfc_get_config_reg(pfc, enum_id, &cr, &field, &value);
if (ret < 0)
return ret;
sh_pfc_write_config_reg(pfc, cr, field, value);
}
return 0;
}
const struct pinmux_bias_reg *
sh_pfc_pin_to_bias_reg(const struct sh_pfc *pfc, unsigned int pin,
unsigned int *bit)
{
unsigned int i, j;
for (i = 0; pfc->info->bias_regs[i].puen; i++) {
for (j = 0; j < ARRAY_SIZE(pfc->info->bias_regs[i].pins); j++) {
if (pfc->info->bias_regs[i].pins[j] == pin) {
*bit = j;
return &pfc->info->bias_regs[i];
}
}
}
WARN_ONCE(1, "Pin %u is not in bias info list\n", pin);
return NULL;
}
static int sh_pfc_init_ranges(struct sh_pfc *pfc)
{
struct sh_pfc_pin_range *range;
unsigned int nr_ranges;
unsigned int i;
if (pfc->info->pins[0].pin == (u16)-1) {
/* Pin number -1 denotes that the SoC doesn't report pin numbers
* in its pin arrays yet. Consider the pin numbers range as
* continuous and allocate a single range.
*/
pfc->nr_ranges = 1;
pfc->ranges = devm_kzalloc(pfc->dev, sizeof(*pfc->ranges),
GFP_KERNEL);
if (pfc->ranges == NULL)
return -ENOMEM;
pfc->ranges->start = 0;
pfc->ranges->end = pfc->info->nr_pins - 1;
pfc->nr_gpio_pins = pfc->info->nr_pins;
return 0;
}
/* Count, allocate and fill the ranges. The PFC SoC data pins array must
* be sorted by pin numbers, and pins without a GPIO port must come
* last.
*/
for (i = 1, nr_ranges = 1; i < pfc->info->nr_pins; ++i) {
if (pfc->info->pins[i-1].pin != pfc->info->pins[i].pin - 1)
nr_ranges++;
}
pfc->nr_ranges = nr_ranges;
pfc->ranges = devm_kcalloc(pfc->dev, nr_ranges, sizeof(*pfc->ranges),
GFP_KERNEL);
if (pfc->ranges == NULL)
return -ENOMEM;
range = pfc->ranges;
range->start = pfc->info->pins[0].pin;
for (i = 1; i < pfc->info->nr_pins; ++i) {
if (pfc->info->pins[i-1].pin == pfc->info->pins[i].pin - 1)
continue;
range->end = pfc->info->pins[i-1].pin;
if (!(pfc->info->pins[i-1].configs & SH_PFC_PIN_CFG_NO_GPIO))
pfc->nr_gpio_pins = range->end + 1;
range++;
range->start = pfc->info->pins[i].pin;
}
range->end = pfc->info->pins[i-1].pin;
if (!(pfc->info->pins[i-1].configs & SH_PFC_PIN_CFG_NO_GPIO))
pfc->nr_gpio_pins = range->end + 1;
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id sh_pfc_of_table[] = {
#ifdef CONFIG_PINCTRL_PFC_EMEV2
{
.compatible = "renesas,pfc-emev2",
.data = &emev2_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A73A4
{
.compatible = "renesas,pfc-r8a73a4",
.data = &r8a73a4_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7740
{
.compatible = "renesas,pfc-r8a7740",
.data = &r8a7740_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7742
{
.compatible = "renesas,pfc-r8a7742",
.data = &r8a7742_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7743
{
.compatible = "renesas,pfc-r8a7743",
.data = &r8a7743_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7744
{
.compatible = "renesas,pfc-r8a7744",
.data = &r8a7744_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7745
{
.compatible = "renesas,pfc-r8a7745",
.data = &r8a7745_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A77470
{
.compatible = "renesas,pfc-r8a77470",
.data = &r8a77470_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A774A1
{
.compatible = "renesas,pfc-r8a774a1",
.data = &r8a774a1_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A774B1
{
.compatible = "renesas,pfc-r8a774b1",
.data = &r8a774b1_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A774C0
{
.compatible = "renesas,pfc-r8a774c0",
.data = &r8a774c0_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A774E1
{
.compatible = "renesas,pfc-r8a774e1",
.data = &r8a774e1_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7778
{
.compatible = "renesas,pfc-r8a7778",
.data = &r8a7778_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7779
{
.compatible = "renesas,pfc-r8a7779",
.data = &r8a7779_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7790
{
.compatible = "renesas,pfc-r8a7790",
.data = &r8a7790_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7791
{
.compatible = "renesas,pfc-r8a7791",
.data = &r8a7791_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7792
{
.compatible = "renesas,pfc-r8a7792",
.data = &r8a7792_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7793
{
.compatible = "renesas,pfc-r8a7793",
.data = &r8a7793_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7794
{
.compatible = "renesas,pfc-r8a7794",
.data = &r8a7794_pinmux_info,
},
#endif
/* Both r8a7795 entries must be present to make sanity checks work */
#ifdef CONFIG_PINCTRL_PFC_R8A77950
{
.compatible = "renesas,pfc-r8a7795",
.data = &r8a77950_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A77951
{
.compatible = "renesas,pfc-r8a7795",
.data = &r8a77951_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A77960
{
.compatible = "renesas,pfc-r8a7796",
.data = &r8a77960_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A77961
{
.compatible = "renesas,pfc-r8a77961",
.data = &r8a77961_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A77965
{
.compatible = "renesas,pfc-r8a77965",
.data = &r8a77965_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A77970
{
.compatible = "renesas,pfc-r8a77970",
.data = &r8a77970_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A77980
{
.compatible = "renesas,pfc-r8a77980",
.data = &r8a77980_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A77990
{
.compatible = "renesas,pfc-r8a77990",
.data = &r8a77990_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A77995
{
.compatible = "renesas,pfc-r8a77995",
.data = &r8a77995_pinmux_info,
},
#endif
#ifdef CONFIG_PINCTRL_PFC_SH73A0
{
.compatible = "renesas,pfc-sh73a0",
.data = &sh73a0_pinmux_info,
},
#endif
{ },
};
#endif
#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_ARM_PSCI_FW)
static void sh_pfc_nop_reg(struct sh_pfc *pfc, u32 reg, unsigned int idx)
{
}
static void sh_pfc_save_reg(struct sh_pfc *pfc, u32 reg, unsigned int idx)
{
pfc->saved_regs[idx] = sh_pfc_read(pfc, reg);
}
static void sh_pfc_restore_reg(struct sh_pfc *pfc, u32 reg, unsigned int idx)
{
sh_pfc_write(pfc, reg, pfc->saved_regs[idx]);
}
static unsigned int sh_pfc_walk_regs(struct sh_pfc *pfc,
void (*do_reg)(struct sh_pfc *pfc, u32 reg, unsigned int idx))
{
unsigned int i, n = 0;
if (pfc->info->cfg_regs)
for (i = 0; pfc->info->cfg_regs[i].reg; i++)
do_reg(pfc, pfc->info->cfg_regs[i].reg, n++);
if (pfc->info->drive_regs)
for (i = 0; pfc->info->drive_regs[i].reg; i++)
do_reg(pfc, pfc->info->drive_regs[i].reg, n++);
if (pfc->info->bias_regs)
for (i = 0; pfc->info->bias_regs[i].puen; i++) {
do_reg(pfc, pfc->info->bias_regs[i].puen, n++);
if (pfc->info->bias_regs[i].pud)
do_reg(pfc, pfc->info->bias_regs[i].pud, n++);
}
if (pfc->info->ioctrl_regs)
for (i = 0; pfc->info->ioctrl_regs[i].reg; i++)
do_reg(pfc, pfc->info->ioctrl_regs[i].reg, n++);
return n;
}
static int sh_pfc_suspend_init(struct sh_pfc *pfc)
{
unsigned int n;
/* This is the best we can do to check for the presence of PSCI */
if (!psci_ops.cpu_suspend)
return 0;
n = sh_pfc_walk_regs(pfc, sh_pfc_nop_reg);
if (!n)
return 0;
pfc->saved_regs = devm_kmalloc_array(pfc->dev, n,
sizeof(*pfc->saved_regs),
GFP_KERNEL);
if (!pfc->saved_regs)
return -ENOMEM;
dev_dbg(pfc->dev, "Allocated space to save %u regs\n", n);
return 0;
}
static int sh_pfc_suspend_noirq(struct device *dev)
{
struct sh_pfc *pfc = dev_get_drvdata(dev);
if (pfc->saved_regs)
sh_pfc_walk_regs(pfc, sh_pfc_save_reg);
return 0;
}
static int sh_pfc_resume_noirq(struct device *dev)
{
struct sh_pfc *pfc = dev_get_drvdata(dev);
if (pfc->saved_regs)
sh_pfc_walk_regs(pfc, sh_pfc_restore_reg);
return 0;
}
static const struct dev_pm_ops sh_pfc_pm = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sh_pfc_suspend_noirq, sh_pfc_resume_noirq)
};
#define DEV_PM_OPS &sh_pfc_pm
#else
static int sh_pfc_suspend_init(struct sh_pfc *pfc) { return 0; }
#define DEV_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP && CONFIG_ARM_PSCI_FW */
#ifdef DEBUG
#define SH_PFC_MAX_REGS 300
#define SH_PFC_MAX_ENUMS 3000
static unsigned int sh_pfc_errors __initdata = 0;
static unsigned int sh_pfc_warnings __initdata = 0;
static u32 *sh_pfc_regs __initdata = NULL;
static u32 sh_pfc_num_regs __initdata = 0;
static u16 *sh_pfc_enums __initdata = NULL;
static u32 sh_pfc_num_enums __initdata = 0;
#define sh_pfc_err(fmt, ...) \
do { \
pr_err("%s: " fmt, drvname, ##__VA_ARGS__); \
sh_pfc_errors++; \
} while (0)
#define sh_pfc_warn(fmt, ...) \
do { \
pr_warn("%s: " fmt, drvname, ##__VA_ARGS__); \
sh_pfc_warnings++; \
} while (0)
static bool __init is0s(const u16 *enum_ids, unsigned int n)
{
unsigned int i;
for (i = 0; i < n; i++)
if (enum_ids[i])
return false;
return true;
}
static bool __init same_name(const char *a, const char *b)
{
if (!a || !b)
return false;
return !strcmp(a, b);
}
static void __init sh_pfc_check_reg(const char *drvname, u32 reg)
{
unsigned int i;
for (i = 0; i < sh_pfc_num_regs; i++)
if (reg == sh_pfc_regs[i]) {
sh_pfc_err("reg 0x%x conflict\n", reg);
return;
}
if (sh_pfc_num_regs == SH_PFC_MAX_REGS) {
pr_warn_once("%s: Please increase SH_PFC_MAX_REGS\n", drvname);
return;
}
sh_pfc_regs[sh_pfc_num_regs++] = reg;
}
static int __init sh_pfc_check_enum(const char *drvname, u16 enum_id)
{
unsigned int i;
for (i = 0; i < sh_pfc_num_enums; i++) {
if (enum_id == sh_pfc_enums[i])
return -EINVAL;
}
if (sh_pfc_num_enums == SH_PFC_MAX_ENUMS) {
pr_warn_once("%s: Please increase SH_PFC_MAX_ENUMS\n", drvname);
return 0;
}
sh_pfc_enums[sh_pfc_num_enums++] = enum_id;
return 0;
}
static void __init sh_pfc_check_reg_enums(const char *drvname, u32 reg,
const u16 *enums, unsigned int n)
{
unsigned int i;
for (i = 0; i < n; i++) {
if (enums[i] && sh_pfc_check_enum(drvname, enums[i]))
sh_pfc_err("reg 0x%x enum_id %u conflict\n", reg,
enums[i]);
}
}
static void __init sh_pfc_check_pin(const struct sh_pfc_soc_info *info,
u32 reg, unsigned int pin)
{
const char *drvname = info->name;
unsigned int i;
if (pin == SH_PFC_PIN_NONE)
return;
for (i = 0; i < info->nr_pins; i++) {
if (pin == info->pins[i].pin)
return;
}
sh_pfc_err("reg 0x%x: pin %u not found\n", reg, pin);
}
static void __init sh_pfc_check_cfg_reg(const char *drvname,
const struct pinmux_cfg_reg *cfg_reg)
{
unsigned int i, n, rw, fw;
sh_pfc_check_reg(drvname, cfg_reg->reg);
if (cfg_reg->field_width) {
n = cfg_reg->reg_width / cfg_reg->field_width;
/* Skip field checks (done at build time) */
goto check_enum_ids;
}
for (i = 0, n = 0, rw = 0; (fw = cfg_reg->var_field_width[i]); i++) {
if (fw > 3 && is0s(&cfg_reg->enum_ids[n], 1 << fw))
sh_pfc_warn("reg 0x%x: reserved field [%u:%u] can be split to reduce table size\n",
cfg_reg->reg, rw, rw + fw - 1);
n += 1 << fw;
rw += fw;
}
if (rw != cfg_reg->reg_width)
sh_pfc_err("reg 0x%x: var_field_width declares %u instead of %u bits\n",
cfg_reg->reg, rw, cfg_reg->reg_width);
if (n != cfg_reg->nr_enum_ids)
sh_pfc_err("reg 0x%x: enum_ids[] has %u instead of %u values\n",
cfg_reg->reg, cfg_reg->nr_enum_ids, n);
check_enum_ids:
sh_pfc_check_reg_enums(drvname, cfg_reg->reg, cfg_reg->enum_ids, n);
}
static void __init sh_pfc_check_drive_reg(const struct sh_pfc_soc_info *info,
const struct pinmux_drive_reg *drive)
{
const char *drvname = info->name;
unsigned long seen = 0, mask;
unsigned int i;
sh_pfc_check_reg(info->name, drive->reg);
for (i = 0; i < ARRAY_SIZE(drive->fields); i++) {
const struct pinmux_drive_reg_field *field = &drive->fields[i];
if (!field->pin && !field->offset && !field->size)
continue;
mask = GENMASK(field->offset + field->size, field->offset);
if (mask & seen)
sh_pfc_err("drive_reg 0x%x: field %u overlap\n",
drive->reg, i);
seen |= mask;
sh_pfc_check_pin(info, drive->reg, field->pin);
}
}
static void __init sh_pfc_check_bias_reg(const struct sh_pfc_soc_info *info,
const struct pinmux_bias_reg *bias)
{
unsigned int i;
sh_pfc_check_reg(info->name, bias->puen);
if (bias->pud)
sh_pfc_check_reg(info->name, bias->pud);
for (i = 0; i < ARRAY_SIZE(bias->pins); i++)
sh_pfc_check_pin(info, bias->puen, bias->pins[i]);
}
static void __init sh_pfc_check_info(const struct sh_pfc_soc_info *info)
{
const char *drvname = info->name;
unsigned int *refcnts;
unsigned int i, j, k;
pr_info("Checking %s\n", drvname);
sh_pfc_num_regs = 0;
sh_pfc_num_enums = 0;
/* Check pins */
for (i = 0; i < info->nr_pins; i++) {
const struct sh_pfc_pin *pin = &info->pins[i];
if (!pin->name) {
sh_pfc_err("empty pin %u\n", i);
continue;
}
for (j = 0; j < i; j++) {
const struct sh_pfc_pin *pin2 = &info->pins[j];
if (same_name(pin->name, pin2->name))
sh_pfc_err("pin %s: name conflict\n",
pin->name);
if (pin->pin != (u16)-1 && pin->pin == pin2->pin)
sh_pfc_err("pin %s/%s: pin %u conflict\n",
pin->name, pin2->name, pin->pin);
if (pin->enum_id && pin->enum_id == pin2->enum_id)
sh_pfc_err("pin %s/%s: enum_id %u conflict\n",
pin->name, pin2->name,
pin->enum_id);
}
}
/* Check groups and functions */
refcnts = kcalloc(info->nr_groups, sizeof(*refcnts), GFP_KERNEL);
if (!refcnts)
return;
for (i = 0; i < info->nr_functions; i++) {
const struct sh_pfc_function *func = &info->functions[i];
if (!func->name) {
sh_pfc_err("empty function %u\n", i);
continue;
}
for (j = 0; j < i; j++) {
if (same_name(func->name, info->functions[j].name))
sh_pfc_err("function %s: name conflict\n",
func->name);
}
for (j = 0; j < func->nr_groups; j++) {
for (k = 0; k < info->nr_groups; k++) {
if (same_name(func->groups[j],
info->groups[k].name)) {
refcnts[k]++;
break;
}
}
if (k == info->nr_groups)
sh_pfc_err("function %s: group %s not found\n",
func->name, func->groups[j]);
}
}
for (i = 0; i < info->nr_groups; i++) {
const struct sh_pfc_pin_group *group = &info->groups[i];
if (!group->name) {
sh_pfc_err("empty group %u\n", i);
continue;
}
for (j = 0; j < i; j++) {
if (same_name(group->name, info->groups[j].name))
sh_pfc_err("group %s: name conflict\n",
group->name);
}
if (!refcnts[i])
sh_pfc_err("orphan group %s\n", group->name);
else if (refcnts[i] > 1)
sh_pfc_warn("group %s referenced by %u functions\n",
group->name, refcnts[i]);
}
kfree(refcnts);
/* Check config register descriptions */
for (i = 0; info->cfg_regs && info->cfg_regs[i].reg; i++)
sh_pfc_check_cfg_reg(drvname, &info->cfg_regs[i]);
/* Check drive strength registers */
for (i = 0; info->drive_regs && info->drive_regs[i].reg; i++)
sh_pfc_check_drive_reg(info, &info->drive_regs[i]);
/* Check bias registers */
for (i = 0; info->bias_regs && info->bias_regs[i].puen; i++)
sh_pfc_check_bias_reg(info, &info->bias_regs[i]);
/* Check ioctrl registers */
for (i = 0; info->ioctrl_regs && info->ioctrl_regs[i].reg; i++)
sh_pfc_check_reg(drvname, info->ioctrl_regs[i].reg);
/* Check data registers */
for (i = 0; info->data_regs && info->data_regs[i].reg; i++) {
sh_pfc_check_reg(drvname, info->data_regs[i].reg);
sh_pfc_check_reg_enums(drvname, info->data_regs[i].reg,
info->data_regs[i].enum_ids,
info->data_regs[i].reg_width);
}
#ifdef CONFIG_PINCTRL_SH_FUNC_GPIO
/* Check function GPIOs */
for (i = 0; i < info->nr_func_gpios; i++) {
const struct pinmux_func *func = &info->func_gpios[i];
if (!func->name) {
sh_pfc_err("empty function gpio %u\n", i);
continue;
}
for (j = 0; j < i; j++) {
if (same_name(func->name, info->func_gpios[j].name))
sh_pfc_err("func_gpio %s: name conflict\n",
func->name);
}
if (sh_pfc_check_enum(drvname, func->enum_id))
sh_pfc_err("%s enum_id %u conflict\n", func->name,
func->enum_id);
}
#endif
}
static void __init sh_pfc_check_driver(const struct platform_driver *pdrv)
{
unsigned int i;
sh_pfc_regs = kcalloc(SH_PFC_MAX_REGS, sizeof(*sh_pfc_regs),
GFP_KERNEL);
if (!sh_pfc_regs)
return;
sh_pfc_enums = kcalloc(SH_PFC_MAX_ENUMS, sizeof(*sh_pfc_enums),
GFP_KERNEL);
if (!sh_pfc_enums)
goto free_regs;
pr_warn("Checking builtin pinmux tables\n");
for (i = 0; pdrv->id_table[i].name[0]; i++)
sh_pfc_check_info((void *)pdrv->id_table[i].driver_data);
#ifdef CONFIG_OF
for (i = 0; pdrv->driver.of_match_table[i].compatible[0]; i++)
sh_pfc_check_info(pdrv->driver.of_match_table[i].data);
#endif
pr_warn("Detected %u errors and %u warnings\n", sh_pfc_errors,
sh_pfc_warnings);
kfree(sh_pfc_enums);
free_regs:
kfree(sh_pfc_regs);
}
#else /* !DEBUG */
static inline void sh_pfc_check_driver(struct platform_driver *pdrv) {}
#endif /* !DEBUG */
#ifdef CONFIG_OF
static const void *sh_pfc_quirk_match(void)
{
#if defined(CONFIG_PINCTRL_PFC_R8A77950) || \
defined(CONFIG_PINCTRL_PFC_R8A77951)
const struct soc_device_attribute *match;
static const struct soc_device_attribute quirks[] = {
{
.soc_id = "r8a7795", .revision = "ES1.*",
.data = &r8a77950_pinmux_info,
},
{
.soc_id = "r8a7795",
.data = &r8a77951_pinmux_info,
},
{ /* sentinel */ }
};
match = soc_device_match(quirks);
if (match)
return match->data ?: ERR_PTR(-ENODEV);
#endif /* CONFIG_PINCTRL_PFC_R8A77950 || CONFIG_PINCTRL_PFC_R8A77951 */
return NULL;
}
#endif /* CONFIG_OF */
static int sh_pfc_probe(struct platform_device *pdev)
{
const struct sh_pfc_soc_info *info;
struct sh_pfc *pfc;
int ret;
#ifdef CONFIG_OF
if (pdev->dev.of_node) {
info = sh_pfc_quirk_match();
if (IS_ERR(info))
return PTR_ERR(info);
if (!info)
info = of_device_get_match_data(&pdev->dev);
} else
#endif
info = (const void *)platform_get_device_id(pdev)->driver_data;
pfc = devm_kzalloc(&pdev->dev, sizeof(*pfc), GFP_KERNEL);
if (pfc == NULL)
return -ENOMEM;
pfc->info = info;
pfc->dev = &pdev->dev;
ret = sh_pfc_map_resources(pfc, pdev);
if (unlikely(ret < 0))
return ret;
spin_lock_init(&pfc->lock);
if (info->ops && info->ops->init) {
ret = info->ops->init(pfc);
if (ret < 0)
return ret;
/* .init() may have overridden pfc->info */
info = pfc->info;
}
ret = sh_pfc_suspend_init(pfc);
if (ret)
return ret;
/* Enable dummy states for those platforms without pinctrl support */
if (!of_have_populated_dt())
pinctrl_provide_dummies();
ret = sh_pfc_init_ranges(pfc);
if (ret < 0)
return ret;
/*
* Initialize pinctrl bindings first
*/
ret = sh_pfc_register_pinctrl(pfc);
if (unlikely(ret != 0))
return ret;
#ifdef CONFIG_PINCTRL_SH_PFC_GPIO
/*
* Then the GPIO chip
*/
ret = sh_pfc_register_gpiochip(pfc);
if (unlikely(ret != 0)) {
/*
* If the GPIO chip fails to come up we still leave the
* PFC state as it is, given that there are already
* extant users of it that have succeeded by this point.
*/
dev_notice(pfc->dev, "failed to init GPIO chip, ignoring...\n");
}
#endif
platform_set_drvdata(pdev, pfc);
dev_info(pfc->dev, "%s support registered\n", info->name);
return 0;
}
static const struct platform_device_id sh_pfc_id_table[] = {
#ifdef CONFIG_PINCTRL_PFC_SH7203
{ "pfc-sh7203", (kernel_ulong_t)&sh7203_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7264
{ "pfc-sh7264", (kernel_ulong_t)&sh7264_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7269
{ "pfc-sh7269", (kernel_ulong_t)&sh7269_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7720
{ "pfc-sh7720", (kernel_ulong_t)&sh7720_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7722
{ "pfc-sh7722", (kernel_ulong_t)&sh7722_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7723
{ "pfc-sh7723", (kernel_ulong_t)&sh7723_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7724
{ "pfc-sh7724", (kernel_ulong_t)&sh7724_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7734
{ "pfc-sh7734", (kernel_ulong_t)&sh7734_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7757
{ "pfc-sh7757", (kernel_ulong_t)&sh7757_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7785
{ "pfc-sh7785", (kernel_ulong_t)&sh7785_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7786
{ "pfc-sh7786", (kernel_ulong_t)&sh7786_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SHX3
{ "pfc-shx3", (kernel_ulong_t)&shx3_pinmux_info },
#endif
{ },
};
static struct platform_driver sh_pfc_driver = {
.probe = sh_pfc_probe,
.id_table = sh_pfc_id_table,
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(sh_pfc_of_table),
.pm = DEV_PM_OPS,
},
};
static int __init sh_pfc_init(void)
{
sh_pfc_check_driver(&sh_pfc_driver);
return platform_driver_register(&sh_pfc_driver);
}
postcore_initcall(sh_pfc_init);
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