diff options
Diffstat (limited to 'drivers/pinctrl/ti/pinctrl-ti-iodelay.c')
| -rw-r--r-- | drivers/pinctrl/ti/pinctrl-ti-iodelay.c | 937 |
1 files changed, 937 insertions, 0 deletions
diff --git a/drivers/pinctrl/ti/pinctrl-ti-iodelay.c b/drivers/pinctrl/ti/pinctrl-ti-iodelay.c new file mode 100644 index 000000000000..717e3404900c --- /dev/null +++ b/drivers/pinctrl/ti/pinctrl-ti-iodelay.c @@ -0,0 +1,937 @@ +/* + * Support for configuration of IO Delay module found on Texas Instruments SoCs + * such as DRA7 + * + * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/ + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/err.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/regmap.h> +#include <linux/slab.h> + +#include "../core.h" +#include "../devicetree.h" + +#define DRIVER_NAME "ti-iodelay" + +/** + * struct ti_iodelay_reg_data - Describes the registers for the iodelay instance + * @signature_mask: CONFIG_REG mask for the signature bits (see TRM) + * @signature_value: CONFIG_REG signature value to be written (see TRM) + * @lock_mask: CONFIG_REG mask for the lock bits (see TRM) + * @lock_val: CONFIG_REG lock value for the lock bits (see TRM) + * @unlock_val:CONFIG_REG unlock value for the lock bits (see TRM) + * @binary_data_coarse_mask: CONFIG_REG coarse mask (see TRM) + * @binary_data_fine_mask: CONFIG_REG fine mask (see TRM) + * @reg_refclk_offset: Refclk register offset + * @refclk_period_mask: Refclk mask + * @reg_coarse_offset: Coarse register configuration offset + * @coarse_delay_count_mask: Coarse delay count mask + * @coarse_ref_count_mask: Coarse ref count mask + * @reg_fine_offset: Fine register configuration offset + * @fine_delay_count_mask: Fine delay count mask + * @fine_ref_count_mask: Fine ref count mask + * @reg_global_lock_offset: Global iodelay module lock register offset + * @global_lock_mask: Lock mask + * @global_unlock_val: Unlock value + * @global_lock_val: Lock value + * @reg_start_offset: Offset to iodelay registers after the CONFIG_REG_0 to 8 + * @reg_nr_per_pin: Number of iodelay registers for each pin + * @regmap_config: Regmap configuration for the IODelay region + */ +struct ti_iodelay_reg_data { + u32 signature_mask; + u32 signature_value; + u32 lock_mask; + u32 lock_val; + u32 unlock_val; + u32 binary_data_coarse_mask; + u32 binary_data_fine_mask; + + u32 reg_refclk_offset; + u32 refclk_period_mask; + + u32 reg_coarse_offset; + u32 coarse_delay_count_mask; + u32 coarse_ref_count_mask; + + u32 reg_fine_offset; + u32 fine_delay_count_mask; + u32 fine_ref_count_mask; + + u32 reg_global_lock_offset; + u32 global_lock_mask; + u32 global_unlock_val; + u32 global_lock_val; + + u32 reg_start_offset; + u32 reg_nr_per_pin; + + struct regmap_config *regmap_config; +}; + +/** + * struct ti_iodelay_reg_values - Computed io_reg configuration values (see TRM) + * @coarse_ref_count: Coarse reference count + * @coarse_delay_count: Coarse delay count + * @fine_ref_count: Fine reference count + * @fine_delay_count: Fine Delay count + * @ref_clk_period: Reference Clock period + * @cdpe: Coarse delay parameter + * @fdpe: Fine delay parameter + */ +struct ti_iodelay_reg_values { + u16 coarse_ref_count; + u16 coarse_delay_count; + + u16 fine_ref_count; + u16 fine_delay_count; + + u16 ref_clk_period; + + u32 cdpe; + u32 fdpe; +}; + +/** + * struct ti_iodelay_cfg - Description of each configuration parameters + * @offset: Configuration register offset + * @a_delay: Agnostic Delay (in ps) + * @g_delay: Gnostic Delay (in ps) + */ +struct ti_iodelay_cfg { + u16 offset; + u16 a_delay; + u16 g_delay; +}; + +/** + * struct ti_iodelay_pingroup - Structure that describes one group + * @cfg: configuration array for the pin (from dt) + * @ncfg: number of configuration values allocated + * @config: pinconf "Config" - currently a dummy value + */ +struct ti_iodelay_pingroup { + struct ti_iodelay_cfg *cfg; + int ncfg; + unsigned long config; +}; + +/** + * struct ti_iodelay_device - Represents information for a iodelay instance + * @dev: Device pointer + * @phys_base: Physical address base of the iodelay device + * @reg_base: Virtual address base of the iodelay device + * @regmap: Regmap for this iodelay instance + * @pctl: Pinctrl device + * @desc: pinctrl descriptor for pctl + * @pa: pinctrl pin wise description + * @reg_data: Register definition data for the IODelay instance + * @reg_init_conf_values: Initial configuration values. + */ +struct ti_iodelay_device { + struct device *dev; + unsigned long phys_base; + void __iomem *reg_base; + struct regmap *regmap; + + struct pinctrl_dev *pctl; + struct pinctrl_desc desc; + struct pinctrl_pin_desc *pa; + + const struct ti_iodelay_reg_data *reg_data; + struct ti_iodelay_reg_values reg_init_conf_values; +}; + +/** + * ti_iodelay_extract() - extract bits for a field + * @val: Register value + * @mask: Mask + * + * Return: extracted value which is appropriately shifted + */ +static inline u32 ti_iodelay_extract(u32 val, u32 mask) +{ + return (val & mask) >> __ffs(mask); +} + +/** + * ti_iodelay_compute_dpe() - Compute equation for delay parameter + * @period: Period to use + * @ref: Reference Count + * @delay: Delay count + * @delay_m: Delay multiplier + * + * Return: Computed delay parameter + */ +static inline u32 ti_iodelay_compute_dpe(u16 period, u16 ref, u16 delay, + u16 delay_m) +{ + u64 m, d; + + /* Handle overflow conditions */ + m = 10 * (u64)period * (u64)ref; + d = 2 * (u64)delay * (u64)delay_m; + + /* Truncate result back to 32 bits */ + return div64_u64(m, d); +} + +/** + * ti_iodelay_pinconf_set() - Configure the pin configuration + * @iod: iodelay device + * @cfg: Configuration + * + * Update the configuration register as per TRM and lockup once done. + * *IMPORTANT NOTE* SoC TRM does recommend doing iodelay programmation only + * while in Isolation. But, then, isolation also implies that every pin + * on the SoC (including DDR) will be isolated out. The only benefit being + * a glitchless configuration, However, the intent of this driver is purely + * to support a "glitchy" configuration where applicable. + * + * Return: 0 in case of success, else appropriate error value + */ +static int ti_iodelay_pinconf_set(struct ti_iodelay_device *iod, + struct ti_iodelay_cfg *cfg) +{ + const struct ti_iodelay_reg_data *reg = iod->reg_data; + struct ti_iodelay_reg_values *ival = &iod->reg_init_conf_values; + struct device *dev = iod->dev; + u32 g_delay_coarse, g_delay_fine; + u32 a_delay_coarse, a_delay_fine; + u32 c_elements, f_elements; + u32 total_delay; + u32 reg_mask, reg_val, tmp_val; + int r; + + /* NOTE: Truncation is expected in all division below */ + g_delay_coarse = cfg->g_delay / 920; + g_delay_fine = ((cfg->g_delay % 920) * 10) / 60; + + a_delay_coarse = cfg->a_delay / ival->cdpe; + a_delay_fine = ((cfg->a_delay % ival->cdpe) * 10) / ival->fdpe; + + c_elements = g_delay_coarse + a_delay_coarse; + f_elements = (g_delay_fine + a_delay_fine) / 10; + + if (f_elements > 22) { + total_delay = c_elements * ival->cdpe + f_elements * ival->fdpe; + c_elements = total_delay / ival->cdpe; + f_elements = (total_delay % ival->cdpe) / ival->fdpe; + } + + reg_mask = reg->signature_mask; + reg_val = reg->signature_value << __ffs(reg->signature_mask); + + reg_mask |= reg->binary_data_coarse_mask; + tmp_val = c_elements << __ffs(reg->binary_data_coarse_mask); + if (tmp_val & ~reg->binary_data_coarse_mask) { + dev_err(dev, "Masking overflow of coarse elements %08x\n", + tmp_val); + tmp_val &= reg->binary_data_coarse_mask; + } + reg_val |= tmp_val; + + reg_mask |= reg->binary_data_fine_mask; + tmp_val = f_elements << __ffs(reg->binary_data_fine_mask); + if (tmp_val & ~reg->binary_data_fine_mask) { + dev_err(dev, "Masking overflow of fine elements %08x\n", + tmp_val); + tmp_val &= reg->binary_data_fine_mask; + } + reg_val |= tmp_val; + + /* + * NOTE: we leave the iodelay values unlocked - this is to work around + * situations such as those found with mmc mode change. + * However, this leaves open any unwarranted changes to padconf register + * impacting iodelay configuration. Use with care! + */ + reg_mask |= reg->lock_mask; + reg_val |= reg->unlock_val << __ffs(reg->lock_mask); + r = regmap_update_bits(iod->regmap, cfg->offset, reg_mask, reg_val); + + dev_info(dev, "Set reg 0x%x Delay(a: %d g: %d), Elements(C=%d F=%d)0x%x\n", + cfg->offset, cfg->a_delay, cfg->g_delay, c_elements, + f_elements, reg_val); + + return r; +} + +/** + * ti_iodelay_pinconf_init_dev() - Initialize IODelay device + * @iod: iodelay device + * + * Unlocks the iodelay region, computes the common parameters + * + * Return: 0 in case of success, else appropriate error value + */ +static int ti_iodelay_pinconf_init_dev(struct ti_iodelay_device *iod) +{ + const struct ti_iodelay_reg_data *reg = iod->reg_data; + struct device *dev = iod->dev; + struct ti_iodelay_reg_values *ival = &iod->reg_init_conf_values; + u32 val; + int r; + + /* unlock the iodelay region */ + r = regmap_update_bits(iod->regmap, reg->reg_global_lock_offset, + reg->global_lock_mask, reg->global_unlock_val); + if (r) + return r; + + /* Read up Recalibration sequence done by bootloader */ + r = regmap_read(iod->regmap, reg->reg_refclk_offset, &val); + if (r) + return r; + ival->ref_clk_period = ti_iodelay_extract(val, reg->refclk_period_mask); + dev_dbg(dev, "refclk_period=0x%04x\n", ival->ref_clk_period); + + r = regmap_read(iod->regmap, reg->reg_coarse_offset, &val); + if (r) + return r; + ival->coarse_ref_count = + ti_iodelay_extract(val, reg->coarse_ref_count_mask); + ival->coarse_delay_count = + ti_iodelay_extract(val, reg->coarse_delay_count_mask); + if (!ival->coarse_delay_count) { + dev_err(dev, "Invalid Coarse delay count (0) (reg=0x%08x)\n", + val); + return -EINVAL; + } + ival->cdpe = ti_iodelay_compute_dpe(ival->ref_clk_period, + ival->coarse_ref_count, + ival->coarse_delay_count, 88); + if (!ival->cdpe) { + dev_err(dev, "Invalid cdpe computed params = %d %d %d\n", + ival->ref_clk_period, ival->coarse_ref_count, + ival->coarse_delay_count); + return -EINVAL; + } + dev_dbg(iod->dev, "coarse: ref=0x%04x delay=0x%04x cdpe=0x%08x\n", + ival->coarse_ref_count, ival->coarse_delay_count, ival->cdpe); + + r = regmap_read(iod->regmap, reg->reg_fine_offset, &val); + if (r) + return r; + ival->fine_ref_count = + ti_iodelay_extract(val, reg->fine_ref_count_mask); + ival->fine_delay_count = + ti_iodelay_extract(val, reg->fine_delay_count_mask); + if (!ival->fine_delay_count) { + dev_err(dev, "Invalid Fine delay count (0) (reg=0x%08x)\n", + val); + return -EINVAL; + } + ival->fdpe = ti_iodelay_compute_dpe(ival->ref_clk_period, + ival->fine_ref_count, + ival->fine_delay_count, 264); + if (!ival->fdpe) { + dev_err(dev, "Invalid fdpe(0) computed params = %d %d %d\n", + ival->ref_clk_period, ival->fine_ref_count, + ival->fine_delay_count); + return -EINVAL; + } + dev_dbg(iod->dev, "fine: ref=0x%04x delay=0x%04x fdpe=0x%08x\n", + ival->fine_ref_count, ival->fine_delay_count, ival->fdpe); + + return 0; +} + +/** + * ti_iodelay_pinconf_deinit_dev() - deinit the iodelay device + * @iod: IODelay device + * + * Deinitialize the IODelay device (basically just lock the region back up. + */ +static void ti_iodelay_pinconf_deinit_dev(struct ti_iodelay_device *iod) +{ + const struct ti_iodelay_reg_data *reg = iod->reg_data; + + /* lock the iodelay region back again */ + regmap_update_bits(iod->regmap, reg->reg_global_lock_offset, + reg->global_lock_mask, reg->global_lock_val); +} + +/** + * ti_iodelay_get_pingroup() - Find the group mapped by a group selector + * @iod: iodelay device + * @selector: Group Selector + * + * Return: Corresponding group representing group selector + */ +static struct ti_iodelay_pingroup * +ti_iodelay_get_pingroup(struct ti_iodelay_device *iod, unsigned int selector) +{ + struct group_desc *g; + + g = pinctrl_generic_get_group(iod->pctl, selector); + if (!g) { + dev_err(iod->dev, "%s could not find pingroup %i\n", __func__, + selector); + + return NULL; + } + + return g->data; +} + +/** + * ti_iodelay_offset_to_pin() - get a pin index based on the register offset + * @iod: iodelay driver instance + * @offset: register offset from the base + */ +static int ti_iodelay_offset_to_pin(struct ti_iodelay_device *iod, + unsigned int offset) +{ + const struct ti_iodelay_reg_data *r = iod->reg_data; + unsigned int index; + + if (offset > r->regmap_config->max_register) { + dev_err(iod->dev, "mux offset out of range: 0x%x (0x%x)\n", + offset, r->regmap_config->max_register); + return -EINVAL; + } + + index = (offset - r->reg_start_offset) / r->regmap_config->reg_stride; + index /= r->reg_nr_per_pin; + + return index; +} + +/** + * ti_iodelay_node_iterator() - Iterate iodelay node + * @pctldev: Pin controller driver + * @np: Device node + * @pinctrl_spec: Parsed arguments from device tree + * @pins: Array of pins in the pin group + * @pin_index: Pin index in the pin array + * @data: Pin controller driver specific data + * + */ +static int ti_iodelay_node_iterator(struct pinctrl_dev *pctldev, + struct device_node *np, + const struct of_phandle_args *pinctrl_spec, + int *pins, int pin_index, void *data) +{ + struct ti_iodelay_device *iod; + struct ti_iodelay_cfg *cfg = data; + const struct ti_iodelay_reg_data *r; + struct pinctrl_pin_desc *pd; + int pin; + + iod = pinctrl_dev_get_drvdata(pctldev); + if (!iod) + return -EINVAL; + + r = iod->reg_data; + + if (pinctrl_spec->args_count < r->reg_nr_per_pin) { + dev_err(iod->dev, "invalid args_count for spec: %i\n", + pinctrl_spec->args_count); + + return -EINVAL; + } + + /* Index plus two value cells */ + cfg[pin_index].offset = pinctrl_spec->args[0]; + cfg[pin_index].a_delay = pinctrl_spec->args[1] & 0xffff; + cfg[pin_index].g_delay = pinctrl_spec->args[2] & 0xffff; + + pin = ti_iodelay_offset_to_pin(iod, cfg[pin_index].offset); + if (pin < 0) { + dev_err(iod->dev, "could not add functions for %s %ux\n", + np->name, cfg[pin_index].offset); + return -ENODEV; + } + pins[pin_index] = pin; + + pd = &iod->pa[pin]; + pd->drv_data = &cfg[pin_index]; + + dev_dbg(iod->dev, "%s offset=%x a_delay = %d g_delay = %d\n", + np->name, cfg[pin_index].offset, cfg[pin_index].a_delay, + cfg[pin_index].g_delay); + + return 0; +} + +/** + * ti_iodelay_dt_node_to_map() - Map a device tree node to appropriate group + * @pctldev: pinctrl device representing IODelay device + * @np: Node Pointer (device tree) + * @map: Pinctrl Map returned back to pinctrl framework + * @num_maps: Number of maps (1) + * + * Maps the device tree description into a group of configuration parameters + * for iodelay block entry. + * + * Return: 0 in case of success, else appropriate error value + */ +static int ti_iodelay_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np, + struct pinctrl_map **map, + unsigned int *num_maps) +{ + struct ti_iodelay_device *iod; + struct ti_iodelay_cfg *cfg; + struct ti_iodelay_pingroup *g; + const char *name = "pinctrl-pin-array"; + int rows, *pins, error = -EINVAL, i; + + iod = pinctrl_dev_get_drvdata(pctldev); + if (!iod) + return -EINVAL; + + rows = pinctrl_count_index_with_args(np, name); + if (rows == -EINVAL) + return rows; + + *map = devm_kzalloc(iod->dev, sizeof(**map), GFP_KERNEL); + if (!*map) + return -ENOMEM; + *num_maps = 0; + + g = devm_kzalloc(iod->dev, sizeof(*g), GFP_KERNEL); + if (!g) { + error = -ENOMEM; + goto free_map; + } + + pins = devm_kzalloc(iod->dev, sizeof(*pins) * rows, GFP_KERNEL); + if (!pins) + goto free_group; + + cfg = devm_kzalloc(iod->dev, sizeof(*cfg) * rows, GFP_KERNEL); + if (!cfg) { + error = -ENOMEM; + goto free_pins; + } + + for (i = 0; i < rows; i++) { + struct of_phandle_args pinctrl_spec; + + error = pinctrl_parse_index_with_args(np, name, i, + &pinctrl_spec); + if (error) + goto free_data; + + error = ti_iodelay_node_iterator(pctldev, np, &pinctrl_spec, + pins, i, cfg); + if (error) + goto free_data; + } + + g->cfg = cfg; + g->ncfg = i; + g->config = PIN_CONFIG_END; + + error = pinctrl_generic_add_group(iod->pctl, np->name, pins, i, g); + if (error < 0) + goto free_data; + + (*map)->type = PIN_MAP_TYPE_CONFIGS_GROUP; + (*map)->data.configs.group_or_pin = np->name; + (*map)->data.configs.configs = &g->config; + (*map)->data.configs.num_configs = 1; + *num_maps = 1; + + return 0; + +free_data: + devm_kfree(iod->dev, cfg); +free_pins: + devm_kfree(iod->dev, pins); +free_group: + devm_kfree(iod->dev, g); +free_map: + devm_kfree(iod->dev, *map); + + return error; +} + +/** + * ti_iodelay_pinconf_group_get() - Get the group configuration + * @pctldev: pinctrl device representing IODelay device + * @selector: Group selector + * @config: Configuration returned + * + * Return: The configuration if the group is valid, else returns -EINVAL + */ +static int ti_iodelay_pinconf_group_get(struct pinctrl_dev *pctldev, + unsigned int selector, + unsigned long *config) +{ + struct ti_iodelay_device *iod; + struct device *dev; + struct ti_iodelay_pingroup *group; + + iod = pinctrl_dev_get_drvdata(pctldev); + dev = iod->dev; + group = ti_iodelay_get_pingroup(iod, selector); + + if (!group) + return -EINVAL; + + *config = group->config; + return 0; +} + +/** + * ti_iodelay_pinconf_group_set() - Configure the groups of pins + * @pctldev: pinctrl device representing IODelay device + * @selector: Group selector + * @configs: Configurations + * @num_configs: Number of configurations + * + * Return: 0 if all went fine, else appropriate error value. + */ +static int ti_iodelay_pinconf_group_set(struct pinctrl_dev *pctldev, + unsigned int selector, + unsigned long *configs, + unsigned int num_configs) +{ + struct ti_iodelay_device *iod; + struct device *dev; + struct ti_iodelay_pingroup *group; + int i; + + iod = pinctrl_dev_get_drvdata(pctldev); + dev = iod->dev; + group = ti_iodelay_get_pingroup(iod, selector); + + if (num_configs != 1) { + dev_err(dev, "Unsupported number of configurations %d\n", + num_configs); + return -EINVAL; + } + + if (*configs != PIN_CONFIG_END) { + dev_err(dev, "Unsupported configuration\n"); + return -EINVAL; + } + + for (i = 0; i < group->ncfg; i++) { + if (ti_iodelay_pinconf_set(iod, &group->cfg[i])) + return -ENOTSUPP; + } + + return 0; +} + +#ifdef CONFIG_DEBUG_FS +/** + * ti_iodelay_pin_to_offset() - get pin register offset based on the pin index + * @iod: iodelay driver instance + * @selector: Pin index + */ +static unsigned int ti_iodelay_pin_to_offset(struct ti_iodelay_device *iod, + unsigned int selector) +{ + const struct ti_iodelay_reg_data *r = iod->reg_data; + unsigned int offset; + + offset = selector * r->regmap_config->reg_stride; + offset *= r->reg_nr_per_pin; + offset += r->reg_start_offset; + + return offset; +} + +static void ti_iodelay_pin_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, + unsigned int pin) +{ + struct ti_iodelay_device *iod; + struct pinctrl_pin_desc *pd; + struct ti_iodelay_cfg *cfg; + const struct ti_iodelay_reg_data *r; + unsigned long offset; + u32 in, oen, out; + + iod = pinctrl_dev_get_drvdata(pctldev); + r = iod->reg_data; + + offset = ti_iodelay_pin_to_offset(iod, pin); + pd = &iod->pa[pin]; + cfg = pd->drv_data; + + regmap_read(iod->regmap, offset, &in); + regmap_read(iod->regmap, offset + r->regmap_config->reg_stride, &oen); + regmap_read(iod->regmap, offset + r->regmap_config->reg_stride * 2, + &out); + + seq_printf(s, "%lx a: %i g: %i (%08x %08x %08x) %s ", + iod->phys_base + offset, + cfg ? cfg->a_delay : -1, + cfg ? cfg->g_delay : -1, + in, oen, out, DRIVER_NAME); +} + +/** + * ti_iodelay_pinconf_group_dbg_show() - show the group information + * @pctldev: Show the group information + * @s: Sequence file + * @selector: Group selector + * + * Provide the configuration information of the selected group + */ +static void ti_iodelay_pinconf_group_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, + unsigned int selector) +{ + struct ti_iodelay_device *iod; + struct device *dev; + struct ti_iodelay_pingroup *group; + int i; + + iod = pinctrl_dev_get_drvdata(pctldev); + dev = iod->dev; + group = ti_iodelay_get_pingroup(iod, selector); + if (!group) + return; + + for (i = 0; i < group->ncfg; i++) { + struct ti_iodelay_cfg *cfg; + u32 reg = 0; + + cfg = &group->cfg[i]; + regmap_read(iod->regmap, cfg->offset, ®), + seq_printf(s, "\n\t0x%08x = 0x%08x (%3d, %3d)", + cfg->offset, reg, cfg->a_delay, + cfg->g_delay); + } +} +#endif + +static struct pinctrl_ops ti_iodelay_pinctrl_ops = { + .get_groups_count = pinctrl_generic_get_group_count, + .get_group_name = pinctrl_generic_get_group_name, + .get_group_pins = pinctrl_generic_get_group_pins, +#ifdef CONFIG_DEBUG_FS + .pin_dbg_show = ti_iodelay_pin_dbg_show, +#endif + .dt_node_to_map = ti_iodelay_dt_node_to_map, +}; + +static struct pinconf_ops ti_iodelay_pinctrl_pinconf_ops = { + .pin_config_group_get = ti_iodelay_pinconf_group_get, + .pin_config_group_set = ti_iodelay_pinconf_group_set, +#ifdef CONFIG_DEBUG_FS + .pin_config_group_dbg_show = ti_iodelay_pinconf_group_dbg_show, +#endif +}; + +/** + * ti_iodelay_alloc_pins() - Allocate structures needed for pins for iodelay + * @dev: Device pointer + * @iod: iodelay device + * @base_phy: Base Physical Address + * + * Return: 0 if all went fine, else appropriate error value. + */ +static int ti_iodelay_alloc_pins(struct device *dev, + struct ti_iodelay_device *iod, u32 base_phy) +{ + const struct ti_iodelay_reg_data *r = iod->reg_data; + struct pinctrl_pin_desc *pin; + u32 phy_reg; + int nr_pins, i; + + nr_pins = ti_iodelay_offset_to_pin(iod, r->regmap_config->max_register); + dev_dbg(dev, "Allocating %i pins\n", nr_pins); + + iod->pa = devm_kzalloc(dev, sizeof(*iod->pa) * nr_pins, GFP_KERNEL); + if (!iod->pa) + return -ENOMEM; + + iod->desc.pins = iod->pa; + iod->desc.npins = nr_pins; + + phy_reg = r->reg_start_offset + base_phy; + + for (i = 0; i < nr_pins; i++, phy_reg += 4) { + pin = &iod->pa[i]; + pin->number = i; + } + + return 0; +} + +static struct regmap_config dra7_iodelay_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = 0xd1c, +}; + +static struct ti_iodelay_reg_data dra7_iodelay_data = { + .signature_mask = 0x0003f000, + .signature_value = 0x29, + .lock_mask = 0x00000400, + .lock_val = 1, + .unlock_val = 0, + .binary_data_coarse_mask = 0x000003e0, + .binary_data_fine_mask = 0x0000001f, + + .reg_refclk_offset = 0x14, + .refclk_period_mask = 0xffff, + + .reg_coarse_offset = 0x18, + .coarse_delay_count_mask = 0xffff0000, + .coarse_ref_count_mask = 0x0000ffff, + + .reg_fine_offset = 0x1C, + .fine_delay_count_mask = 0xffff0000, + .fine_ref_count_mask = 0x0000ffff, + + .reg_global_lock_offset = 0x2c, + .global_lock_mask = 0x0000ffff, + .global_unlock_val = 0x0000aaaa, + .global_lock_val = 0x0000aaab, + + .reg_start_offset = 0x30, + .reg_nr_per_pin = 3, + .regmap_config = &dra7_iodelay_regmap_config, +}; + +static const struct of_device_id ti_iodelay_of_match[] = { + {.compatible = "ti,dra7-iodelay", .data = &dra7_iodelay_data}, + { /* Hopefully no more.. */ }, +}; +MODULE_DEVICE_TABLE(of, ti_iodelay_of_match); + +/** + * ti_iodelay_probe() - Standard probe + * @pdev: platform device + * + * Return: 0 if all went fine, else appropriate error value. + */ +static int ti_iodelay_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = of_node_get(dev->of_node); + const struct of_device_id *match; + struct resource *res; + struct ti_iodelay_device *iod; + int ret = 0; + + if (!np) { + ret = -EINVAL; + dev_err(dev, "No OF node\n"); + goto exit_out; + } + + match = of_match_device(ti_iodelay_of_match, dev); + if (!match) { + ret = -EINVAL; + dev_err(dev, "No DATA match\n"); + goto exit_out; + } + + iod = devm_kzalloc(dev, sizeof(*iod), GFP_KERNEL); + if (!iod) { + ret = -ENOMEM; + goto exit_out; + } + iod->dev = dev; + iod->reg_data = match->data; + + /* So far We can assume there is only 1 bank of registers */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "Missing MEM resource\n"); + ret = -ENODEV; + goto exit_out; + } + + iod->phys_base = res->start; + iod->reg_base = devm_ioremap_resource(dev, res); + if (IS_ERR(iod->reg_base)) { + ret = PTR_ERR(iod->reg_base); + goto exit_out; + } + + iod->regmap = devm_regmap_init_mmio(dev, iod->reg_base, + iod->reg_data->regmap_config); + if (IS_ERR(iod->regmap)) { + dev_err(dev, "Regmap MMIO init failed.\n"); + ret = PTR_ERR(iod->regmap); + goto exit_out; + } + + if (ti_iodelay_pinconf_init_dev(iod)) + goto exit_out; + + ret = ti_iodelay_alloc_pins(dev, iod, res->start); + if (ret) + goto exit_out; + + iod->desc.pctlops = &ti_iodelay_pinctrl_ops; + /* no pinmux ops - we are pinconf */ + iod->desc.confops = &ti_iodelay_pinctrl_pinconf_ops; + iod->desc.name = dev_name(dev); + iod->desc.owner = THIS_MODULE; + + ret = pinctrl_register_and_init(&iod->desc, dev, iod, &iod->pctl); + if (ret) { + dev_err(dev, "Failed to register pinctrl\n"); + goto exit_out; + } + + platform_set_drvdata(pdev, iod); + +exit_out: + of_node_put(np); + return ret; +} + +/** + * ti_iodelay_remove() - standard remove + * @pdev: platform device + * + * Return: 0 if all went fine, else appropriate error value. + */ +static int ti_iodelay_remove(struct platform_device *pdev) +{ + struct ti_iodelay_device *iod = platform_get_drvdata(pdev); + + if (!iod) + return 0; + + if (iod->pctl) + pinctrl_unregister(iod->pctl); + + ti_iodelay_pinconf_deinit_dev(iod); + + /* Expect other allocations to be freed by devm */ + + return 0; +} + +static struct platform_driver ti_iodelay_driver = { + .probe = ti_iodelay_probe, + .remove = ti_iodelay_remove, + .driver = { + .owner = THIS_MODULE, + .name = DRIVER_NAME, + .of_match_table = ti_iodelay_of_match, + }, +}; +module_platform_driver(ti_iodelay_driver); + +MODULE_AUTHOR("Texas Instruments, Inc."); +MODULE_DESCRIPTION("Pinconf driver for TI's IO Delay module"); +MODULE_LICENSE("GPL v2"); |