diff options
Diffstat (limited to 'drivers/soc/ti/omap_prm.c')
| -rw-r--r-- | drivers/soc/ti/omap_prm.c | 391 |
1 files changed, 0 insertions, 391 deletions
diff --git a/drivers/soc/ti/omap_prm.c b/drivers/soc/ti/omap_prm.c deleted file mode 100644 index 96c6f777519c..000000000000 --- a/drivers/soc/ti/omap_prm.c +++ /dev/null @@ -1,391 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * OMAP2+ PRM driver - * - * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ - * Tero Kristo <t-kristo@ti.com> - */ - -#include <linux/kernel.h> -#include <linux/device.h> -#include <linux/io.h> -#include <linux/iopoll.h> -#include <linux/of.h> -#include <linux/of_device.h> -#include <linux/platform_device.h> -#include <linux/reset-controller.h> -#include <linux/delay.h> - -#include <linux/platform_data/ti-prm.h> - -struct omap_rst_map { - s8 rst; - s8 st; -}; - -struct omap_prm_data { - u32 base; - const char *name; - const char *clkdm_name; - u16 rstctrl; - u16 rstst; - const struct omap_rst_map *rstmap; - u8 flags; -}; - -struct omap_prm { - const struct omap_prm_data *data; - void __iomem *base; -}; - -struct omap_reset_data { - struct reset_controller_dev rcdev; - struct omap_prm *prm; - u32 mask; - spinlock_t lock; - struct clockdomain *clkdm; - struct device *dev; -}; - -#define to_omap_reset_data(p) container_of((p), struct omap_reset_data, rcdev) - -#define OMAP_MAX_RESETS 8 -#define OMAP_RESET_MAX_WAIT 10000 - -#define OMAP_PRM_HAS_RSTCTRL BIT(0) -#define OMAP_PRM_HAS_RSTST BIT(1) -#define OMAP_PRM_HAS_NO_CLKDM BIT(2) - -#define OMAP_PRM_HAS_RESETS (OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_RSTST) - -static const struct omap_rst_map rst_map_0[] = { - { .rst = 0, .st = 0 }, - { .rst = -1 }, -}; - -static const struct omap_rst_map rst_map_01[] = { - { .rst = 0, .st = 0 }, - { .rst = 1, .st = 1 }, - { .rst = -1 }, -}; - -static const struct omap_rst_map rst_map_012[] = { - { .rst = 0, .st = 0 }, - { .rst = 1, .st = 1 }, - { .rst = 2, .st = 2 }, - { .rst = -1 }, -}; - -static const struct omap_prm_data omap4_prm_data[] = { - { .name = "tesla", .base = 0x4a306400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 }, - { .name = "core", .base = 0x4a306700, .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ducati", .rstmap = rst_map_012 }, - { .name = "ivahd", .base = 0x4a306f00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012 }, - { .name = "device", .base = 0x4a307b00, .rstctrl = 0x0, .rstst = 0x4, .rstmap = rst_map_01, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM }, - { }, -}; - -static const struct omap_prm_data omap5_prm_data[] = { - { .name = "dsp", .base = 0x4ae06400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 }, - { .name = "core", .base = 0x4ae06700, .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ipu", .rstmap = rst_map_012 }, - { .name = "iva", .base = 0x4ae07200, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012 }, - { .name = "device", .base = 0x4ae07c00, .rstctrl = 0x0, .rstst = 0x4, .rstmap = rst_map_01, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM }, - { }, -}; - -static const struct omap_prm_data dra7_prm_data[] = { - { .name = "dsp1", .base = 0x4ae06400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 }, - { .name = "ipu", .base = 0x4ae06500, .rstctrl = 0x10, .rstst = 0x14, .clkdm_name = "ipu1", .rstmap = rst_map_012 }, - { .name = "core", .base = 0x4ae06700, .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ipu2", .rstmap = rst_map_012 }, - { .name = "iva", .base = 0x4ae06f00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012 }, - { .name = "dsp2", .base = 0x4ae07b00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 }, - { .name = "eve1", .base = 0x4ae07b40, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 }, - { .name = "eve2", .base = 0x4ae07b80, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 }, - { .name = "eve3", .base = 0x4ae07bc0, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 }, - { .name = "eve4", .base = 0x4ae07c00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 }, - { }, -}; - -static const struct omap_rst_map am3_per_rst_map[] = { - { .rst = 1 }, - { .rst = -1 }, -}; - -static const struct omap_rst_map am3_wkup_rst_map[] = { - { .rst = 3, .st = 5 }, - { .rst = -1 }, -}; - -static const struct omap_prm_data am3_prm_data[] = { - { .name = "per", .base = 0x44e00c00, .rstctrl = 0x0, .rstmap = am3_per_rst_map, .flags = OMAP_PRM_HAS_RSTCTRL, .clkdm_name = "pruss_ocp" }, - { .name = "wkup", .base = 0x44e00d00, .rstctrl = 0x0, .rstst = 0xc, .rstmap = am3_wkup_rst_map, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM }, - { .name = "device", .base = 0x44e00f00, .rstctrl = 0x0, .rstst = 0x8, .rstmap = rst_map_01, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM }, - { .name = "gfx", .base = 0x44e01100, .rstctrl = 0x4, .rstst = 0x14, .rstmap = rst_map_0, .clkdm_name = "gfx_l3" }, - { }, -}; - -static const struct omap_rst_map am4_per_rst_map[] = { - { .rst = 1, .st = 0 }, - { .rst = -1 }, -}; - -static const struct omap_rst_map am4_device_rst_map[] = { - { .rst = 0, .st = 1 }, - { .rst = 1, .st = 0 }, - { .rst = -1 }, -}; - -static const struct omap_prm_data am4_prm_data[] = { - { .name = "gfx", .base = 0x44df0400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_0, .clkdm_name = "gfx_l3" }, - { .name = "per", .base = 0x44df0800, .rstctrl = 0x10, .rstst = 0x14, .rstmap = am4_per_rst_map, .clkdm_name = "pruss_ocp" }, - { .name = "wkup", .base = 0x44df2000, .rstctrl = 0x10, .rstst = 0x14, .rstmap = am3_wkup_rst_map, .flags = OMAP_PRM_HAS_NO_CLKDM }, - { .name = "device", .base = 0x44df4000, .rstctrl = 0x0, .rstst = 0x4, .rstmap = am4_device_rst_map, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM }, - { }, -}; - -static const struct of_device_id omap_prm_id_table[] = { - { .compatible = "ti,omap4-prm-inst", .data = omap4_prm_data }, - { .compatible = "ti,omap5-prm-inst", .data = omap5_prm_data }, - { .compatible = "ti,dra7-prm-inst", .data = dra7_prm_data }, - { .compatible = "ti,am3-prm-inst", .data = am3_prm_data }, - { .compatible = "ti,am4-prm-inst", .data = am4_prm_data }, - { }, -}; - -static bool _is_valid_reset(struct omap_reset_data *reset, unsigned long id) -{ - if (reset->mask & BIT(id)) - return true; - - return false; -} - -static int omap_reset_get_st_bit(struct omap_reset_data *reset, - unsigned long id) -{ - const struct omap_rst_map *map = reset->prm->data->rstmap; - - while (map->rst >= 0) { - if (map->rst == id) - return map->st; - - map++; - } - - return id; -} - -static int omap_reset_status(struct reset_controller_dev *rcdev, - unsigned long id) -{ - struct omap_reset_data *reset = to_omap_reset_data(rcdev); - u32 v; - int st_bit = omap_reset_get_st_bit(reset, id); - bool has_rstst = reset->prm->data->rstst || - (reset->prm->data->flags & OMAP_PRM_HAS_RSTST); - - /* Check if we have rstst */ - if (!has_rstst) - return -ENOTSUPP; - - /* Check if hw reset line is asserted */ - v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl); - if (v & BIT(id)) - return 1; - - /* - * Check reset status, high value means reset sequence has been - * completed successfully so we can return 0 here (reset deasserted) - */ - v = readl_relaxed(reset->prm->base + reset->prm->data->rstst); - v >>= st_bit; - v &= 1; - - return !v; -} - -static int omap_reset_assert(struct reset_controller_dev *rcdev, - unsigned long id) -{ - struct omap_reset_data *reset = to_omap_reset_data(rcdev); - u32 v; - unsigned long flags; - - /* assert the reset control line */ - spin_lock_irqsave(&reset->lock, flags); - v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl); - v |= 1 << id; - writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl); - spin_unlock_irqrestore(&reset->lock, flags); - - return 0; -} - -static int omap_reset_deassert(struct reset_controller_dev *rcdev, - unsigned long id) -{ - struct omap_reset_data *reset = to_omap_reset_data(rcdev); - u32 v; - int st_bit; - bool has_rstst; - unsigned long flags; - struct ti_prm_platform_data *pdata = dev_get_platdata(reset->dev); - int ret = 0; - - has_rstst = reset->prm->data->rstst || - (reset->prm->data->flags & OMAP_PRM_HAS_RSTST); - - if (has_rstst) { - st_bit = omap_reset_get_st_bit(reset, id); - - /* Clear the reset status by writing 1 to the status bit */ - v = 1 << st_bit; - writel_relaxed(v, reset->prm->base + reset->prm->data->rstst); - } - - if (reset->clkdm) - pdata->clkdm_deny_idle(reset->clkdm); - - /* de-assert the reset control line */ - spin_lock_irqsave(&reset->lock, flags); - v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl); - v &= ~(1 << id); - writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl); - spin_unlock_irqrestore(&reset->lock, flags); - - if (!has_rstst) - goto exit; - - /* wait for the status to be set */ - ret = readl_relaxed_poll_timeout(reset->prm->base + - reset->prm->data->rstst, - v, v & BIT(st_bit), 1, - OMAP_RESET_MAX_WAIT); - if (ret) - pr_err("%s: timedout waiting for %s:%lu\n", __func__, - reset->prm->data->name, id); - -exit: - if (reset->clkdm) - pdata->clkdm_allow_idle(reset->clkdm); - - return ret; -} - -static const struct reset_control_ops omap_reset_ops = { - .assert = omap_reset_assert, - .deassert = omap_reset_deassert, - .status = omap_reset_status, -}; - -static int omap_prm_reset_xlate(struct reset_controller_dev *rcdev, - const struct of_phandle_args *reset_spec) -{ - struct omap_reset_data *reset = to_omap_reset_data(rcdev); - - if (!_is_valid_reset(reset, reset_spec->args[0])) - return -EINVAL; - - return reset_spec->args[0]; -} - -static int omap_prm_reset_init(struct platform_device *pdev, - struct omap_prm *prm) -{ - struct omap_reset_data *reset; - const struct omap_rst_map *map; - struct ti_prm_platform_data *pdata = dev_get_platdata(&pdev->dev); - char buf[32]; - - /* - * Check if we have controllable resets. If either rstctrl is non-zero - * or OMAP_PRM_HAS_RSTCTRL flag is set, we have reset control register - * for the domain. - */ - if (!prm->data->rstctrl && !(prm->data->flags & OMAP_PRM_HAS_RSTCTRL)) - return 0; - - /* Check if we have the pdata callbacks in place */ - if (!pdata || !pdata->clkdm_lookup || !pdata->clkdm_deny_idle || - !pdata->clkdm_allow_idle) - return -EINVAL; - - map = prm->data->rstmap; - if (!map) - return -EINVAL; - - reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL); - if (!reset) - return -ENOMEM; - - reset->rcdev.owner = THIS_MODULE; - reset->rcdev.ops = &omap_reset_ops; - reset->rcdev.of_node = pdev->dev.of_node; - reset->rcdev.nr_resets = OMAP_MAX_RESETS; - reset->rcdev.of_xlate = omap_prm_reset_xlate; - reset->rcdev.of_reset_n_cells = 1; - reset->dev = &pdev->dev; - spin_lock_init(&reset->lock); - - reset->prm = prm; - - sprintf(buf, "%s_clkdm", prm->data->clkdm_name ? prm->data->clkdm_name : - prm->data->name); - - if (!(prm->data->flags & OMAP_PRM_HAS_NO_CLKDM)) { - reset->clkdm = pdata->clkdm_lookup(buf); - if (!reset->clkdm) - return -EINVAL; - } - - while (map->rst >= 0) { - reset->mask |= BIT(map->rst); - map++; - } - - return devm_reset_controller_register(&pdev->dev, &reset->rcdev); -} - -static int omap_prm_probe(struct platform_device *pdev) -{ - struct resource *res; - const struct omap_prm_data *data; - struct omap_prm *prm; - const struct of_device_id *match; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -ENODEV; - - match = of_match_device(omap_prm_id_table, &pdev->dev); - if (!match) - return -ENOTSUPP; - - prm = devm_kzalloc(&pdev->dev, sizeof(*prm), GFP_KERNEL); - if (!prm) - return -ENOMEM; - - data = match->data; - - while (data->base != res->start) { - if (!data->base) - return -EINVAL; - data++; - } - - prm->data = data; - - prm->base = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(prm->base)) - return PTR_ERR(prm->base); - - return omap_prm_reset_init(pdev, prm); -} - -static struct platform_driver omap_prm_driver = { - .probe = omap_prm_probe, - .driver = { - .name = KBUILD_MODNAME, - .of_match_table = omap_prm_id_table, - }, -}; -builtin_platform_driver(omap_prm_driver); |