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path: root/drivers/pinctrl/sh-pfc/core.c
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Diffstat (limited to 'drivers/pinctrl/sh-pfc/core.c')
-rw-r--r--drivers/pinctrl/sh-pfc/core.c501
1 files changed, 501 insertions, 0 deletions
diff --git a/drivers/pinctrl/sh-pfc/core.c b/drivers/pinctrl/sh-pfc/core.c
new file mode 100644
index 000000000..b55133692
--- /dev/null
+++ b/drivers/pinctrl/sh-pfc/core.c
@@ -0,0 +1,501 @@
+/*
+ * SuperH Pin Function Controller support.
+ *
+ * Copyright (C) 2008 Magnus Damm
+ * Copyright (C) 2009 - 2012 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#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/module.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "core.h"
+
+static int sh_pfc_ioremap(struct sh_pfc *pfc, struct platform_device *pdev)
+{
+ struct resource *res;
+ int k;
+
+ if (pdev->num_resources == 0)
+ return -EINVAL;
+
+ pfc->window = devm_kzalloc(pfc->dev, pdev->num_resources *
+ sizeof(*pfc->window), GFP_NOWAIT);
+ if (!pfc->window)
+ return -ENOMEM;
+
+ pfc->num_windows = pdev->num_resources;
+
+ for (k = 0, res = pdev->resource; k < pdev->num_resources; k++, res++) {
+ WARN_ON(resource_type(res) != IORESOURCE_MEM);
+ pfc->window[k].phys = res->start;
+ pfc->window[k].size = resource_size(res);
+ pfc->window[k].virt = devm_ioremap_nocache(pfc->dev, res->start,
+ resource_size(res));
+ if (!pfc->window[k].virt)
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void __iomem *sh_pfc_phys_to_virt(struct sh_pfc *pfc,
+ unsigned long address)
+{
+ struct sh_pfc_window *window;
+ unsigned int i;
+
+ /* scan through physical windows and convert address */
+ for (i = 0; i < pfc->num_windows; i++) {
+ window = pfc->window + 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;
+
+ if (pfc->info->ranges == NULL)
+ return pin;
+
+ for (i = 0, offset = 0; i < pfc->info->nr_ranges; ++i) {
+ const struct pinmux_range *range = &pfc->info->ranges[i];
+
+ if (pin <= range->end)
+ return pin >= range->begin
+ ? offset + pin - range->begin : -1;
+
+ offset += range->end - range->begin + 1;
+ }
+
+ return -EINVAL;
+}
+
+static int sh_pfc_enum_in_range(pinmux_enum_t enum_id,
+ const struct pinmux_range *r)
+{
+ if (enum_id < r->begin)
+ return 0;
+
+ if (enum_id > r->end)
+ return 0;
+
+ return 1;
+}
+
+unsigned long sh_pfc_read_raw_reg(void __iomem *mapped_reg,
+ unsigned long 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 long reg_width,
+ unsigned long 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();
+}
+
+static void sh_pfc_config_reg_helper(struct sh_pfc *pfc,
+ const struct pinmux_cfg_reg *crp,
+ unsigned long in_pos,
+ void __iomem **mapped_regp,
+ unsigned long *maskp,
+ unsigned long *posp)
+{
+ 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 long field, unsigned long value)
+{
+ void __iomem *mapped_reg;
+ unsigned long mask, pos, data;
+
+ sh_pfc_config_reg_helper(pfc, crp, field, &mapped_reg, &mask, &pos);
+
+ dev_dbg(pfc->dev, "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);
+ 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, pinmux_enum_t enum_id,
+ const struct pinmux_cfg_reg **crp, int *fieldp,
+ int *valuep)
+{
+ const struct pinmux_cfg_reg *config_reg;
+ unsigned long r_width, f_width, curr_width, ncomb;
+ int k, m, n, pos, bit_pos;
+
+ k = 0;
+ while (1) {
+ config_reg = pfc->info->cfg_regs + k;
+
+ r_width = config_reg->reg_width;
+ f_width = config_reg->field_width;
+
+ if (!r_width)
+ break;
+
+ pos = 0;
+ m = 0;
+ for (bit_pos = 0; bit_pos < r_width; bit_pos += curr_width) {
+ 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, pinmux_enum_t mark, int pos,
+ pinmux_enum_t *enum_idp)
+{
+ const pinmux_enum_t *data = pfc->info->gpio_data;
+ int k;
+
+ if (pos) {
+ *enum_idp = data[pos + 1];
+ return pos + 1;
+ }
+
+ for (k = 0; k < pfc->info->gpio_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_cfg_reg *cr = NULL;
+ pinmux_enum_t enum_id;
+ const struct pinmux_range *range;
+ int in_range, pos, field, value;
+ int ret;
+
+ switch (pinmux_type) {
+ case PINMUX_TYPE_GPIO:
+ case PINMUX_TYPE_FUNCTION:
+ range = NULL;
+ break;
+
+ case PINMUX_TYPE_OUTPUT:
+ range = &pfc->info->output;
+ break;
+
+ case PINMUX_TYPE_INPUT:
+ range = &pfc->info->input;
+ break;
+
+ case PINMUX_TYPE_INPUT_PULLUP:
+ range = &pfc->info->input_pu;
+ break;
+
+ case PINMUX_TYPE_INPUT_PULLDOWN:
+ range = &pfc->info->input_pd;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ pos = 0;
+ enum_id = 0;
+ field = 0;
+ value = 0;
+
+ /* Iterate over all the configuration fields we need to update. */
+ while (1) {
+ 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;
+}
+
+static int sh_pfc_probe(struct platform_device *pdev)
+{
+ const struct sh_pfc_soc_info *info;
+ struct sh_pfc *pfc;
+ int ret;
+
+ info = pdev->id_entry->driver_data
+ ? (void *)pdev->id_entry->driver_data : pdev->dev.platform_data;
+ if (info == NULL)
+ return -ENODEV;
+
+ pfc = devm_kzalloc(&pdev->dev, sizeof(*pfc), GFP_KERNEL);
+ if (pfc == NULL)
+ return -ENOMEM;
+
+ pfc->info = info;
+ pfc->dev = &pdev->dev;
+
+ ret = sh_pfc_ioremap(pfc, pdev);
+ if (unlikely(ret < 0))
+ return ret;
+
+ spin_lock_init(&pfc->lock);
+
+ pinctrl_provide_dummies();
+
+ /*
+ * Initialize pinctrl bindings first
+ */
+ ret = sh_pfc_register_pinctrl(pfc);
+ if (unlikely(ret != 0))
+ return ret;
+
+#ifdef CONFIG_GPIO_SH_PFC
+ /*
+ * 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 int sh_pfc_remove(struct platform_device *pdev)
+{
+ struct sh_pfc *pfc = platform_get_drvdata(pdev);
+
+#ifdef CONFIG_GPIO_SH_PFC
+ sh_pfc_unregister_gpiochip(pfc);
+#endif
+ sh_pfc_unregister_pinctrl(pfc);
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static const struct platform_device_id sh_pfc_id_table[] = {
+#ifdef CONFIG_PINCTRL_PFC_R8A73A4
+ { "pfc-r8a73a4", (kernel_ulong_t)&r8a73a4_pinmux_info },
+#endif
+#ifdef CONFIG_PINCTRL_PFC_R8A7740
+ { "pfc-r8a7740", (kernel_ulong_t)&r8a7740_pinmux_info },
+#endif
+#ifdef CONFIG_PINCTRL_PFC_R8A7779
+ { "pfc-r8a7779", (kernel_ulong_t)&r8a7779_pinmux_info },
+#endif
+#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_SH7372
+ { "pfc-sh7372", (kernel_ulong_t)&sh7372_pinmux_info },
+#endif
+#ifdef CONFIG_PINCTRL_PFC_SH73A0
+ { "pfc-sh73a0", (kernel_ulong_t)&sh73a0_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
+ { "sh-pfc", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(platform, sh_pfc_id_table);
+
+static struct platform_driver sh_pfc_driver = {
+ .probe = sh_pfc_probe,
+ .remove = sh_pfc_remove,
+ .id_table = sh_pfc_id_table,
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init sh_pfc_init(void)
+{
+ return platform_driver_register(&sh_pfc_driver);
+}
+postcore_initcall(sh_pfc_init);
+
+static void __exit sh_pfc_exit(void)
+{
+ platform_driver_unregister(&sh_pfc_driver);
+}
+module_exit(sh_pfc_exit);
+
+MODULE_AUTHOR("Magnus Damm, Paul Mundt, Laurent Pinchart");
+MODULE_DESCRIPTION("Pin Control and GPIO driver for SuperH pin function controller");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2026-03-14 06:33:24 +0000