| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Andy Shevchenko | 2022 | 91.70% | 5 | 41.67% |
| Heikki Krogerus | 95 | 4.31% | 2 | 16.67% |
| Mika Westerberg | 49 | 2.22% | 1 | 8.33% |
| Furquan Shaikh | 20 | 0.91% | 1 | 8.33% |
| Rafael J. Wysocki | 17 | 0.77% | 1 | 8.33% |
| Stephen Boyd | 1 | 0.05% | 1 | 8.33% |
| Linus Torvalds | 1 | 0.05% | 1 | 8.33% |
| Total | 2205 | 12 |
/* * Intel Sunrisepoint LPSS core support. * * Copyright (C) 2015, Intel Corporation * * Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com> * Mika Westerberg <mika.westerberg@linux.intel.com> * Heikki Krogerus <heikki.krogerus@linux.intel.com> * Jarkko Nikula <jarkko.nikula@linux.intel.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/clk.h> #include <linux/clkdev.h> #include <linux/clk-provider.h> #include <linux/debugfs.h> #include <linux/idr.h> #include <linux/ioport.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mfd/core.h> #include <linux/pm_qos.h> #include <linux/pm_runtime.h> #include <linux/property.h> #include <linux/seq_file.h> #include <linux/io-64-nonatomic-lo-hi.h> #include "intel-lpss.h" #define LPSS_DEV_OFFSET 0x000 #define LPSS_DEV_SIZE 0x200 #define LPSS_PRIV_OFFSET 0x200 #define LPSS_PRIV_SIZE 0x100 #define LPSS_PRIV_REG_COUNT (LPSS_PRIV_SIZE / 4) #define LPSS_IDMA64_OFFSET 0x800 #define LPSS_IDMA64_SIZE 0x800 /* Offsets from lpss->priv */ #define LPSS_PRIV_RESETS 0x04 #define LPSS_PRIV_RESETS_IDMA BIT(2) #define LPSS_PRIV_RESETS_FUNC 0x3 #define LPSS_PRIV_ACTIVELTR 0x10 #define LPSS_PRIV_IDLELTR 0x14 #define LPSS_PRIV_LTR_REQ BIT(15) #define LPSS_PRIV_LTR_SCALE_MASK 0xc00 #define LPSS_PRIV_LTR_SCALE_1US 0x800 #define LPSS_PRIV_LTR_SCALE_32US 0xc00 #define LPSS_PRIV_LTR_VALUE_MASK 0x3ff #define LPSS_PRIV_SSP_REG 0x20 #define LPSS_PRIV_SSP_REG_DIS_DMA_FIN BIT(0) #define LPSS_PRIV_REMAP_ADDR 0x40 #define LPSS_PRIV_CAPS 0xfc #define LPSS_PRIV_CAPS_NO_IDMA BIT(8) #define LPSS_PRIV_CAPS_TYPE_SHIFT 4 #define LPSS_PRIV_CAPS_TYPE_MASK (0xf << LPSS_PRIV_CAPS_TYPE_SHIFT) /* This matches the type field in CAPS register */ enum intel_lpss_dev_type { LPSS_DEV_I2C = 0, LPSS_DEV_UART, LPSS_DEV_SPI, }; struct intel_lpss { const struct intel_lpss_platform_info *info; enum intel_lpss_dev_type type; struct clk *clk; struct clk_lookup *clock; struct mfd_cell *cell; struct device *dev; void __iomem *priv; u32 priv_ctx[LPSS_PRIV_REG_COUNT]; int devid; u32 caps; u32 active_ltr; u32 idle_ltr; struct dentry *debugfs; }; static const struct resource intel_lpss_dev_resources[] = { DEFINE_RES_MEM_NAMED(LPSS_DEV_OFFSET, LPSS_DEV_SIZE, "lpss_dev"), DEFINE_RES_MEM_NAMED(LPSS_PRIV_OFFSET, LPSS_PRIV_SIZE, "lpss_priv"), DEFINE_RES_IRQ(0), }; static const struct resource intel_lpss_idma64_resources[] = { DEFINE_RES_MEM(LPSS_IDMA64_OFFSET, LPSS_IDMA64_SIZE), DEFINE_RES_IRQ(0), }; #define LPSS_IDMA64_DRIVER_NAME "idma64" /* * Cells needs to be ordered so that the iDMA is created first. This is * because we need to be sure the DMA is available when the host controller * driver is probed. */ static const struct mfd_cell intel_lpss_idma64_cell = { .name = LPSS_IDMA64_DRIVER_NAME, .num_resources = ARRAY_SIZE(intel_lpss_idma64_resources), .resources = intel_lpss_idma64_resources, }; static const struct mfd_cell intel_lpss_i2c_cell = { .name = "i2c_designware", .num_resources = ARRAY_SIZE(intel_lpss_dev_resources), .resources = intel_lpss_dev_resources, }; static const struct mfd_cell intel_lpss_uart_cell = { .name = "dw-apb-uart", .num_resources = ARRAY_SIZE(intel_lpss_dev_resources), .resources = intel_lpss_dev_resources, }; static const struct mfd_cell intel_lpss_spi_cell = { .name = "pxa2xx-spi", .num_resources = ARRAY_SIZE(intel_lpss_dev_resources), .resources = intel_lpss_dev_resources, }; static DEFINE_IDA(intel_lpss_devid_ida); static struct dentry *intel_lpss_debugfs; static int intel_lpss_request_dma_module(const char *name) { static bool intel_lpss_dma_requested; if (intel_lpss_dma_requested) return 0; intel_lpss_dma_requested = true; return request_module("%s", name); } static void intel_lpss_cache_ltr(struct intel_lpss *lpss) { lpss->active_ltr = readl(lpss->priv + LPSS_PRIV_ACTIVELTR); lpss->idle_ltr = readl(lpss->priv + LPSS_PRIV_IDLELTR); } static int intel_lpss_debugfs_add(struct intel_lpss *lpss) { struct dentry *dir; dir = debugfs_create_dir(dev_name(lpss->dev), intel_lpss_debugfs); if (IS_ERR(dir)) return PTR_ERR(dir); /* Cache the values into lpss structure */ intel_lpss_cache_ltr(lpss); debugfs_create_x32("capabilities", S_IRUGO, dir, &lpss->caps); debugfs_create_x32("active_ltr", S_IRUGO, dir, &lpss->active_ltr); debugfs_create_x32("idle_ltr", S_IRUGO, dir, &lpss->idle_ltr); lpss->debugfs = dir; return 0; } static void intel_lpss_debugfs_remove(struct intel_lpss *lpss) { debugfs_remove_recursive(lpss->debugfs); } static void intel_lpss_ltr_set(struct device *dev, s32 val) { struct intel_lpss *lpss = dev_get_drvdata(dev); u32 ltr; /* * Program latency tolerance (LTR) accordingly what has been asked * by the PM QoS layer or disable it in case we were passed * negative value or PM_QOS_LATENCY_ANY. */ ltr = readl(lpss->priv + LPSS_PRIV_ACTIVELTR); if (val == PM_QOS_LATENCY_ANY || val < 0) { ltr &= ~LPSS_PRIV_LTR_REQ; } else { ltr |= LPSS_PRIV_LTR_REQ; ltr &= ~LPSS_PRIV_LTR_SCALE_MASK; ltr &= ~LPSS_PRIV_LTR_VALUE_MASK; if (val > LPSS_PRIV_LTR_VALUE_MASK) ltr |= LPSS_PRIV_LTR_SCALE_32US | val >> 5; else ltr |= LPSS_PRIV_LTR_SCALE_1US | val; } if (ltr == lpss->active_ltr) return; writel(ltr, lpss->priv + LPSS_PRIV_ACTIVELTR); writel(ltr, lpss->priv + LPSS_PRIV_IDLELTR); /* Cache the values into lpss structure */ intel_lpss_cache_ltr(lpss); } static void intel_lpss_ltr_expose(struct intel_lpss *lpss) { lpss->dev->power.set_latency_tolerance = intel_lpss_ltr_set; dev_pm_qos_expose_latency_tolerance(lpss->dev); } static void intel_lpss_ltr_hide(struct intel_lpss *lpss) { dev_pm_qos_hide_latency_tolerance(lpss->dev); lpss->dev->power.set_latency_tolerance = NULL; } static int intel_lpss_assign_devs(struct intel_lpss *lpss) { const struct mfd_cell *cell; unsigned int type; type = lpss->caps & LPSS_PRIV_CAPS_TYPE_MASK; type >>= LPSS_PRIV_CAPS_TYPE_SHIFT; switch (type) { case LPSS_DEV_I2C: cell = &intel_lpss_i2c_cell; break; case LPSS_DEV_UART: cell = &intel_lpss_uart_cell; break; case LPSS_DEV_SPI: cell = &intel_lpss_spi_cell; break; default: return -ENODEV; } lpss->cell = devm_kmemdup(lpss->dev, cell, sizeof(*cell), GFP_KERNEL); if (!lpss->cell) return -ENOMEM; lpss->type = type; return 0; } static bool intel_lpss_has_idma(const struct intel_lpss *lpss) { return (lpss->caps & LPSS_PRIV_CAPS_NO_IDMA) == 0; } static void intel_lpss_set_remap_addr(const struct intel_lpss *lpss) { resource_size_t addr = lpss->info->mem->start; lo_hi_writeq(addr, lpss->priv + LPSS_PRIV_REMAP_ADDR); } static void intel_lpss_deassert_reset(const struct intel_lpss *lpss) { u32 value = LPSS_PRIV_RESETS_FUNC | LPSS_PRIV_RESETS_IDMA; /* Bring out the device from reset */ writel(value, lpss->priv + LPSS_PRIV_RESETS); } static void intel_lpss_init_dev(const struct intel_lpss *lpss) { u32 value = LPSS_PRIV_SSP_REG_DIS_DMA_FIN; intel_lpss_deassert_reset(lpss); intel_lpss_set_remap_addr(lpss); if (!intel_lpss_has_idma(lpss)) return; /* Make sure that SPI multiblock DMA transfers are re-enabled */ if (lpss->type == LPSS_DEV_SPI) writel(value, lpss->priv + LPSS_PRIV_SSP_REG); } static void intel_lpss_unregister_clock_tree(struct clk *clk) { struct clk *parent; while (clk) { parent = clk_get_parent(clk); clk_unregister(clk); clk = parent; } } static int intel_lpss_register_clock_divider(struct intel_lpss *lpss, const char *devname, struct clk **clk) { char name[32]; struct clk *tmp = *clk; snprintf(name, sizeof(name), "%s-enable", devname); tmp = clk_register_gate(NULL, name, __clk_get_name(tmp), 0, lpss->priv, 0, 0, NULL); if (IS_ERR(tmp)) return PTR_ERR(tmp); snprintf(name, sizeof(name), "%s-div", devname); tmp = clk_register_fractional_divider(NULL, name, __clk_get_name(tmp), 0, lpss->priv, 1, 15, 16, 15, 0, NULL); if (IS_ERR(tmp)) return PTR_ERR(tmp); *clk = tmp; snprintf(name, sizeof(name), "%s-update", devname); tmp = clk_register_gate(NULL, name, __clk_get_name(tmp), CLK_SET_RATE_PARENT, lpss->priv, 31, 0, NULL); if (IS_ERR(tmp)) return PTR_ERR(tmp); *clk = tmp; return 0; } static int intel_lpss_register_clock(struct intel_lpss *lpss) { const struct mfd_cell *cell = lpss->cell; struct clk *clk; char devname[24]; int ret; if (!lpss->info->clk_rate) return 0; /* Root clock */ clk = clk_register_fixed_rate(NULL, dev_name(lpss->dev), NULL, 0, lpss->info->clk_rate); if (IS_ERR(clk)) return PTR_ERR(clk); snprintf(devname, sizeof(devname), "%s.%d", cell->name, lpss->devid); /* * Support for clock divider only if it has some preset value. * Otherwise we assume that the divider is not used. */ if (lpss->type != LPSS_DEV_I2C) { ret = intel_lpss_register_clock_divider(lpss, devname, &clk); if (ret) goto err_clk_register; } ret = -ENOMEM; /* Clock for the host controller */ lpss->clock = clkdev_create(clk, lpss->info->clk_con_id, "%s", devname); if (!lpss->clock) goto err_clk_register; lpss->clk = clk; return 0; err_clk_register: intel_lpss_unregister_clock_tree(clk); return ret; } static void intel_lpss_unregister_clock(struct intel_lpss *lpss) { if (IS_ERR_OR_NULL(lpss->clk)) return; clkdev_drop(lpss->clock); intel_lpss_unregister_clock_tree(lpss->clk); } int intel_lpss_probe(struct device *dev, const struct intel_lpss_platform_info *info) { struct intel_lpss *lpss; int ret; if (!info || !info->mem || info->irq <= 0) return -EINVAL; lpss = devm_kzalloc(dev, sizeof(*lpss), GFP_KERNEL); if (!lpss) return -ENOMEM; lpss->priv = devm_ioremap(dev, info->mem->start + LPSS_PRIV_OFFSET, LPSS_PRIV_SIZE); if (!lpss->priv) return -ENOMEM; lpss->info = info; lpss->dev = dev; lpss->caps = readl(lpss->priv + LPSS_PRIV_CAPS); dev_set_drvdata(dev, lpss); ret = intel_lpss_assign_devs(lpss); if (ret) return ret; lpss->cell->properties = info->properties; intel_lpss_init_dev(lpss); lpss->devid = ida_simple_get(&intel_lpss_devid_ida, 0, 0, GFP_KERNEL); if (lpss->devid < 0) return lpss->devid; ret = intel_lpss_register_clock(lpss); if (ret) goto err_clk_register; intel_lpss_ltr_expose(lpss); ret = intel_lpss_debugfs_add(lpss); if (ret) dev_warn(dev, "Failed to create debugfs entries\n"); if (intel_lpss_has_idma(lpss)) { /* * Ensure the DMA driver is loaded before the host * controller device appears, so that the host controller * driver can request its DMA channels as early as * possible. * * If the DMA module is not there that's OK as well. */ intel_lpss_request_dma_module(LPSS_IDMA64_DRIVER_NAME); ret = mfd_add_devices(dev, lpss->devid, &intel_lpss_idma64_cell, 1, info->mem, info->irq, NULL); if (ret) dev_warn(dev, "Failed to add %s, fallback to PIO\n", LPSS_IDMA64_DRIVER_NAME); } ret = mfd_add_devices(dev, lpss->devid, lpss->cell, 1, info->mem, info->irq, NULL); if (ret) goto err_remove_ltr; dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND); return 0; err_remove_ltr: intel_lpss_debugfs_remove(lpss); intel_lpss_ltr_hide(lpss); intel_lpss_unregister_clock(lpss); err_clk_register: ida_simple_remove(&intel_lpss_devid_ida, lpss->devid); return ret; } EXPORT_SYMBOL_GPL(intel_lpss_probe); void intel_lpss_remove(struct device *dev) { struct intel_lpss *lpss = dev_get_drvdata(dev); mfd_remove_devices(dev); intel_lpss_debugfs_remove(lpss); intel_lpss_ltr_hide(lpss); intel_lpss_unregister_clock(lpss); ida_simple_remove(&intel_lpss_devid_ida, lpss->devid); } EXPORT_SYMBOL_GPL(intel_lpss_remove); static int resume_lpss_device(struct device *dev, void *data) { if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND)) pm_runtime_resume(dev); return 0; } int intel_lpss_prepare(struct device *dev) { /* * Resume both child devices before entering system sleep. This * ensures that they are in proper state before they get suspended. */ device_for_each_child_reverse(dev, NULL, resume_lpss_device); return 0; } EXPORT_SYMBOL_GPL(intel_lpss_prepare); int intel_lpss_suspend(struct device *dev) { struct intel_lpss *lpss = dev_get_drvdata(dev); unsigned int i; /* Save device context */ for (i = 0; i < LPSS_PRIV_REG_COUNT; i++) lpss->priv_ctx[i] = readl(lpss->priv + i * 4); /* * If the device type is not UART, then put the controller into * reset. UART cannot be put into reset since S3/S0ix fail when * no_console_suspend flag is enabled. */ if (lpss->type != LPSS_DEV_UART) writel(0, lpss->priv + LPSS_PRIV_RESETS); return 0; } EXPORT_SYMBOL_GPL(intel_lpss_suspend); int intel_lpss_resume(struct device *dev) { struct intel_lpss *lpss = dev_get_drvdata(dev); unsigned int i; intel_lpss_deassert_reset(lpss); /* Restore device context */ for (i = 0; i < LPSS_PRIV_REG_COUNT; i++) writel(lpss->priv_ctx[i], lpss->priv + i * 4); return 0; } EXPORT_SYMBOL_GPL(intel_lpss_resume); static int __init intel_lpss_init(void) { intel_lpss_debugfs = debugfs_create_dir("intel_lpss", NULL); return 0; } module_init(intel_lpss_init); static void __exit intel_lpss_exit(void) { debugfs_remove(intel_lpss_debugfs); } module_exit(intel_lpss_exit); MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>"); MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>"); MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>"); MODULE_DESCRIPTION("Intel LPSS core driver"); MODULE_LICENSE("GPL v2");
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1