diff options
Diffstat (limited to 'drivers/sh/pfc/core.c')
-rw-r--r-- | drivers/sh/pfc/core.c | 586 |
1 files changed, 0 insertions, 586 deletions
diff --git a/drivers/sh/pfc/core.c b/drivers/sh/pfc/core.c deleted file mode 100644 index 8e7818b..0000000 --- a/drivers/sh/pfc/core.c +++ /dev/null @@ -1,586 +0,0 @@ -/* - * 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" -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#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/sh_pfc.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) { - pfc->num_windows = 0; - return 0; - } - - 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; - int k; - - /* scan through physical windows and convert address */ - for (k = 0; k < pfc->num_windows; k++) { - window = pfc->window + k; - - if (address < window->phys) - continue; - - if (address >= (window->phys + window->size)) - continue; - - return window->virt + (address - window->phys); - } - - /* no windows defined, register must be 1:1 mapped virt:phys */ - return (void __iomem *)address; -} - -static int sh_pfc_enum_in_range(pinmux_enum_t enum_id, struct pinmux_range *r) -{ - if (enum_id < r->begin) - return 0; - - if (enum_id > r->end) - return 0; - - return 1; -} - -static 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; -} - -static 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(); -} - -int sh_pfc_read_bit(struct pinmux_data_reg *dr, unsigned long in_pos) -{ - unsigned long pos; - - pos = dr->reg_width - (in_pos + 1); - - pr_debug("read_bit: addr = %lx, pos = %ld, " - "r_width = %ld\n", dr->reg, pos, dr->reg_width); - - return (sh_pfc_read_raw_reg(dr->mapped_reg, dr->reg_width) >> pos) & 1; -} - -void sh_pfc_write_bit(struct pinmux_data_reg *dr, unsigned long in_pos, - unsigned long value) -{ - unsigned long pos; - - pos = dr->reg_width - (in_pos + 1); - - pr_debug("write_bit addr = %lx, value = %d, pos = %ld, " - "r_width = %ld\n", - dr->reg, !!value, pos, dr->reg_width); - - if (value) - set_bit(pos, &dr->reg_shadow); - else - clear_bit(pos, &dr->reg_shadow); - - sh_pfc_write_raw_reg(dr->mapped_reg, dr->reg_width, dr->reg_shadow); -} - -static void sh_pfc_config_reg_helper(struct sh_pfc *pfc, - 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 int sh_pfc_read_config_reg(struct sh_pfc *pfc, - struct pinmux_cfg_reg *crp, - unsigned long field) -{ - void __iomem *mapped_reg; - unsigned long mask, pos; - - sh_pfc_config_reg_helper(pfc, crp, field, &mapped_reg, &mask, &pos); - - pr_debug("read_reg: addr = %lx, field = %ld, " - "r_width = %ld, f_width = %ld\n", - crp->reg, field, crp->reg_width, crp->field_width); - - return (sh_pfc_read_raw_reg(mapped_reg, crp->reg_width) >> pos) & mask; -} - -static void sh_pfc_write_config_reg(struct sh_pfc *pfc, - 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); - - 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); - value = value << pos; - - data = sh_pfc_read_raw_reg(mapped_reg, crp->reg_width); - data &= mask; - data |= value; - - if (pfc->pdata->unlock_reg) - sh_pfc_write_raw_reg( - sh_pfc_phys_to_virt(pfc, pfc->pdata->unlock_reg), 32, - ~data); - - sh_pfc_write_raw_reg(mapped_reg, crp->reg_width, data); -} - -static int sh_pfc_setup_data_reg(struct sh_pfc *pfc, unsigned gpio) -{ - struct pinmux_gpio *gpiop = &pfc->pdata->gpios[gpio]; - struct pinmux_data_reg *data_reg; - int k, n; - - if (!sh_pfc_enum_in_range(gpiop->enum_id, &pfc->pdata->data)) - return -1; - - k = 0; - while (1) { - data_reg = pfc->pdata->data_regs + k; - - if (!data_reg->reg_width) - break; - - data_reg->mapped_reg = sh_pfc_phys_to_virt(pfc, data_reg->reg); - - for (n = 0; n < data_reg->reg_width; n++) { - if (data_reg->enum_ids[n] == gpiop->enum_id) { - gpiop->flags &= ~PINMUX_FLAG_DREG; - gpiop->flags |= (k << PINMUX_FLAG_DREG_SHIFT); - gpiop->flags &= ~PINMUX_FLAG_DBIT; - gpiop->flags |= (n << PINMUX_FLAG_DBIT_SHIFT); - return 0; - } - } - k++; - } - - BUG(); - - return -1; -} - -static void sh_pfc_setup_data_regs(struct sh_pfc *pfc) -{ - struct pinmux_data_reg *drp; - int k; - - for (k = pfc->pdata->first_gpio; k <= pfc->pdata->last_gpio; k++) - sh_pfc_setup_data_reg(pfc, k); - - k = 0; - while (1) { - drp = pfc->pdata->data_regs + k; - - if (!drp->reg_width) - break; - - drp->reg_shadow = sh_pfc_read_raw_reg(drp->mapped_reg, - drp->reg_width); - k++; - } -} - -int sh_pfc_get_data_reg(struct sh_pfc *pfc, unsigned gpio, - struct pinmux_data_reg **drp, int *bitp) -{ - struct pinmux_gpio *gpiop = &pfc->pdata->gpios[gpio]; - int k, n; - - if (!sh_pfc_enum_in_range(gpiop->enum_id, &pfc->pdata->data)) - return -1; - - k = (gpiop->flags & PINMUX_FLAG_DREG) >> PINMUX_FLAG_DREG_SHIFT; - n = (gpiop->flags & PINMUX_FLAG_DBIT) >> PINMUX_FLAG_DBIT_SHIFT; - *drp = pfc->pdata->data_regs + k; - *bitp = n; - return 0; -} - -static int sh_pfc_get_config_reg(struct sh_pfc *pfc, pinmux_enum_t enum_id, - struct pinmux_cfg_reg **crp, int *fieldp, - int *valuep, unsigned long **cntp) -{ - 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->pdata->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; - *cntp = &config_reg->cnt[m]; - return 0; - } - } - pos += ncomb; - m++; - } - k++; - } - - return -1; -} - -int sh_pfc_gpio_to_enum(struct sh_pfc *pfc, unsigned gpio, int pos, - pinmux_enum_t *enum_idp) -{ - pinmux_enum_t enum_id = pfc->pdata->gpios[gpio].enum_id; - pinmux_enum_t *data = pfc->pdata->gpio_data; - int k; - - if (!sh_pfc_enum_in_range(enum_id, &pfc->pdata->data)) { - if (!sh_pfc_enum_in_range(enum_id, &pfc->pdata->mark)) { - pr_err("non data/mark enum_id for gpio %d\n", gpio); - return -1; - } - } - - if (pos) { - *enum_idp = data[pos + 1]; - return pos + 1; - } - - for (k = 0; k < pfc->pdata->gpio_data_size; k++) { - if (data[k] == enum_id) { - *enum_idp = data[k + 1]; - return k + 1; - } - } - - pr_err("cannot locate data/mark enum_id for gpio %d\n", gpio); - return -1; -} - -int sh_pfc_config_gpio(struct sh_pfc *pfc, unsigned gpio, int pinmux_type, - int cfg_mode) -{ - struct pinmux_cfg_reg *cr = NULL; - pinmux_enum_t enum_id; - struct pinmux_range *range; - int in_range, pos, field, value; - unsigned long *cntp; - - switch (pinmux_type) { - - case PINMUX_TYPE_FUNCTION: - range = NULL; - break; - - case PINMUX_TYPE_OUTPUT: - range = &pfc->pdata->output; - break; - - case PINMUX_TYPE_INPUT: - range = &pfc->pdata->input; - break; - - case PINMUX_TYPE_INPUT_PULLUP: - range = &pfc->pdata->input_pu; - break; - - case PINMUX_TYPE_INPUT_PULLDOWN: - range = &pfc->pdata->input_pd; - break; - - default: - goto out_err; - } - - pos = 0; - enum_id = 0; - field = 0; - value = 0; - while (1) { - pos = sh_pfc_gpio_to_enum(pfc, gpio, pos, &enum_id); - if (pos <= 0) - goto out_err; - - if (!enum_id) - break; - - /* first check if this is a function enum */ - in_range = sh_pfc_enum_in_range(enum_id, &pfc->pdata->function); - if (!in_range) { - /* not a function enum */ - if (range) { - /* - * other range exists, so this pin is - * a regular GPIO pin that now is being - * bound to a specific direction. - * - * for this case we only allow function enums - * and the enums that match the other range. - */ - 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; - } else { - /* - * no other range exists, so this pin - * must then be of the function type. - * - * allow function type pins to select - * any combination of function/in/out - * in their MARK lists. - */ - in_range = 1; - } - } - - if (!in_range) - continue; - - if (sh_pfc_get_config_reg(pfc, enum_id, &cr, - &field, &value, &cntp) != 0) - goto out_err; - - switch (cfg_mode) { - case GPIO_CFG_DRYRUN: - if (!*cntp || - (sh_pfc_read_config_reg(pfc, cr, field) != value)) - continue; - break; - - case GPIO_CFG_REQ: - sh_pfc_write_config_reg(pfc, cr, field, value); - *cntp = *cntp + 1; - break; - - case GPIO_CFG_FREE: - *cntp = *cntp - 1; - break; - } - } - - return 0; - out_err: - return -1; -} - -static int sh_pfc_probe(struct platform_device *pdev) -{ - struct sh_pfc_platform_data *pdata = pdev->dev.platform_data; - struct sh_pfc *pfc; - int ret; - - /* - * Ensure that the type encoding fits - */ - BUILD_BUG_ON(PINMUX_FLAG_TYPE > ((1 << PINMUX_FLAG_DBIT_SHIFT) - 1)); - - if (pdata == NULL) - return -ENODEV; - - pfc = devm_kzalloc(&pdev->dev, sizeof(pfc), GFP_KERNEL); - if (pfc == NULL) - return -ENOMEM; - - pfc->pdata = pdata; - pfc->dev = &pdev->dev; - - ret = sh_pfc_ioremap(pfc, pdev); - if (unlikely(ret < 0)) - return ret; - - spin_lock_init(&pfc->lock); - - pinctrl_provide_dummies(); - sh_pfc_setup_data_regs(pfc); - - /* - * 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. - */ - pr_notice("failed to init GPIO chip, ignoring...\n"); - } -#endif - - platform_set_drvdata(pdev, pfc); - - pr_info("%s support registered\n", pdata->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[] = { - { "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"); |