/* * hdac-ext-controller.c - HD-audio extended controller functions. * * Copyright (C) 2014-2015 Intel Corp * Author: Jeeja KP * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include #include #include #include /* * maximum HDAC capablities we should parse to avoid endless looping: * currently we have 4 extended caps, so this is future proof for now. * extend when this limit is seen meeting in real HW */ #define HDAC_MAX_CAPS 10 /* * processing pipe helpers - these helpers are useful for dealing with HDA * new capability of processing pipelines */ /** * snd_hdac_ext_bus_ppcap_enable - enable/disable processing pipe capability * @ebus: HD-audio extended core bus * @enable: flag to turn on/off the capability */ void snd_hdac_ext_bus_ppcap_enable(struct hdac_ext_bus *ebus, bool enable) { struct hdac_bus *bus = &ebus->bus; if (!bus->ppcap) { dev_err(bus->dev, "Address of PP capability is NULL"); return; } if (enable) snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_GPROCEN); else snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_GPROCEN, 0); } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable); /** * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable * @ebus: HD-audio extended core bus * @enable: flag to enable/disable interrupt */ void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_ext_bus *ebus, bool enable) { struct hdac_bus *bus = &ebus->bus; if (!bus->ppcap) { dev_err(bus->dev, "Address of PP capability is NULL\n"); return; } if (enable) snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_PIE); else snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_PIE, 0); } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable); /* * Multilink helpers - these helpers are useful for dealing with HDA * new multilink capability */ /** * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability * @ebus: HD-audio extended core bus * * This will parse all links and read the mlink capabilities and add them * in hlink_list of extended hdac bus * Note: this will be freed on bus exit by driver */ int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_ext_bus *ebus) { int idx; u32 link_count; struct hdac_ext_link *hlink; struct hdac_bus *bus = &ebus->bus; link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1; dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count); for (idx = 0; idx < link_count; idx++) { hlink = kzalloc(sizeof(*hlink), GFP_KERNEL); if (!hlink) return -ENOMEM; hlink->index = idx; hlink->bus = bus; hlink->ml_addr = bus->mlcap + AZX_ML_BASE + (AZX_ML_INTERVAL * idx); hlink->lcaps = readl(hlink->ml_addr + AZX_REG_ML_LCAP); hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID); /* since link in On, update the ref */ hlink->ref_count = 1; list_add_tail(&hlink->list, &ebus->hlink_list); } return 0; } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities); /** * snd_hdac_link_free_all- free hdac extended link objects * * @ebus: HD-audio ext core bus */ void snd_hdac_link_free_all(struct hdac_ext_bus *ebus) { struct hdac_ext_link *l; while (!list_empty(&ebus->hlink_list)) { l = list_first_entry(&ebus->hlink_list, struct hdac_ext_link, list); list_del(&l->list); kfree(l); } } EXPORT_SYMBOL_GPL(snd_hdac_link_free_all); /** * snd_hdac_ext_bus_get_link_index - get link based on codec name * @ebus: HD-audio extended core bus * @codec_name: codec name */ struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_ext_bus *ebus, const char *codec_name) { int i; struct hdac_ext_link *hlink = NULL; int bus_idx, addr; if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2) return NULL; if (ebus->idx != bus_idx) return NULL; if (addr < 0 || addr > 31) return NULL; list_for_each_entry(hlink, &ebus->hlink_list, list) { for (i = 0; i < HDA_MAX_CODECS; i++) { if (hlink->lsdiid & (0x1 << addr)) return hlink; } } return NULL; } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link); static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable) { int timeout; u32 val; int mask = (1 << AZX_MLCTL_CPA); udelay(3); timeout = 150; do { val = readl(link->ml_addr + AZX_REG_ML_LCTL); if (enable) { if (((val & mask) >> AZX_MLCTL_CPA)) return 0; } else { if (!((val & mask) >> AZX_MLCTL_CPA)) return 0; } udelay(3); } while (--timeout); return -EIO; } /** * snd_hdac_ext_bus_link_power_up -power up hda link * @link: HD-audio extended link */ int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link) { snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA); return check_hdac_link_power_active(link, true); } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up); /** * snd_hdac_ext_bus_link_power_down -power down hda link * @link: HD-audio extended link */ int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link) { snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0); return check_hdac_link_power_active(link, false); } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down); /** * snd_hdac_ext_bus_link_power_up_all -power up all hda link * @ebus: HD-audio extended bus */ int snd_hdac_ext_bus_link_power_up_all(struct hdac_ext_bus *ebus) { struct hdac_ext_link *hlink = NULL; int ret; list_for_each_entry(hlink, &ebus->hlink_list, list) { snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA); ret = check_hdac_link_power_active(hlink, true); if (ret < 0) return ret; } return 0; } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all); /** * snd_hdac_ext_bus_link_power_down_all -power down all hda link * @ebus: HD-audio extended bus */ int snd_hdac_ext_bus_link_power_down_all(struct hdac_ext_bus *ebus) { struct hdac_ext_link *hlink = NULL; int ret; list_for_each_entry(hlink, &ebus->hlink_list, list) { snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0); ret = check_hdac_link_power_active(hlink, false); if (ret < 0) return ret; } return 0; } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all); int snd_hdac_ext_bus_link_get(struct hdac_ext_bus *ebus, struct hdac_ext_link *link) { int ret = 0; mutex_lock(&ebus->lock); /* * if we move from 0 to 1, count will be 1 so power up this link * as well, also check the dma status and trigger that */ if (++link->ref_count == 1) { if (!ebus->cmd_dma_state) { snd_hdac_bus_init_cmd_io(&ebus->bus); ebus->cmd_dma_state = true; } ret = snd_hdac_ext_bus_link_power_up(link); } mutex_unlock(&ebus->lock); return ret; } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get); int snd_hdac_ext_bus_link_put(struct hdac_ext_bus *ebus, struct hdac_ext_link *link) { int ret = 0; struct hdac_ext_link *hlink; bool link_up = false; mutex_lock(&ebus->lock); /* * if we move from 1 to 0, count will be 0 * so power down this link as well */ if (--link->ref_count == 0) { ret = snd_hdac_ext_bus_link_power_down(link); /* * now check if all links are off, if so turn off * cmd dma as well */ list_for_each_entry(hlink, &ebus->hlink_list, list) { if (hlink->ref_count) { link_up = true; break; } } if (!link_up) { snd_hdac_bus_stop_cmd_io(&ebus->bus); ebus->cmd_dma_state = false; } } mutex_unlock(&ebus->lock); return ret; } EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put);