From 261e071acd9bcbcfbc30652640385615ced27f4f Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Thu, 7 Nov 2019 00:38:41 +0200 Subject: [PATCH] mei: abstract fw status register read. This is to allow working with mei devices embedded within another pci device, where mei device is represented as a platform child device and fw status registers are not necessarily resident in the device pci config space. Bump the copyright year to 2019 on the modified files. Signed-off-by: Tomas Winkler Link: https://lore.kernel.org/r/20191106223841.15802-4-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mei/hw-me.c | 24 ++++++++++++++++-------- drivers/misc/mei/hw-me.h | 2 ++ drivers/misc/mei/hw-txe.c | 10 +++++++--- drivers/misc/mei/init.c | 6 ++++-- drivers/misc/mei/mei_dev.h | 8 ++++---- drivers/misc/mei/pci-me.c | 8 ++++++++ 6 files changed, 41 insertions(+), 17 deletions(-) diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c index 23606d0..0ec5543 100644 --- a/drivers/misc/mei/hw-me.c +++ b/drivers/misc/mei/hw-me.c @@ -183,20 +183,19 @@ static inline void mei_me_d0i3c_write(struct mei_device *dev, u32 reg) static int mei_me_fw_status(struct mei_device *dev, struct mei_fw_status *fw_status) { - struct pci_dev *pdev = to_pci_dev(dev->dev); struct mei_me_hw *hw = to_me_hw(dev); const struct mei_fw_status *fw_src = &hw->cfg->fw_status; int ret; int i; - if (!fw_status) + if (!fw_status || !hw->read_fws) return -EINVAL; fw_status->count = fw_src->count; for (i = 0; i < fw_src->count && i < MEI_FW_STATUS_MAX; i++) { - ret = pci_read_config_dword(pdev, fw_src->status[i], - &fw_status->status[i]); - trace_mei_pci_cfg_read(dev->dev, "PCI_CFG_HSF_X", + ret = hw->read_fws(dev, fw_src->status[i], + &fw_status->status[i]); + trace_mei_pci_cfg_read(dev->dev, "PCI_CFG_HFS_X", fw_src->status[i], fw_status->status[i]); if (ret) @@ -210,19 +209,26 @@ static int mei_me_fw_status(struct mei_device *dev, * mei_me_hw_config - configure hw dependent settings * * @dev: mei device + * + * Return: + * * -EINVAL when read_fws is not set + * * 0 on success + * */ -static void mei_me_hw_config(struct mei_device *dev) +static int mei_me_hw_config(struct mei_device *dev) { - struct pci_dev *pdev = to_pci_dev(dev->dev); struct mei_me_hw *hw = to_me_hw(dev); u32 hcsr, reg; + if (WARN_ON(!hw->read_fws)) + return -EINVAL; + /* Doesn't change in runtime */ hcsr = mei_hcsr_read(dev); hw->hbuf_depth = (hcsr & H_CBD) >> 24; reg = 0; - pci_read_config_dword(pdev, PCI_CFG_HFS_1, ®); + hw->read_fws(dev, PCI_CFG_HFS_1, ®); trace_mei_pci_cfg_read(dev->dev, "PCI_CFG_HFS_1", PCI_CFG_HFS_1, reg); hw->d0i3_supported = ((reg & PCI_CFG_HFS_1_D0I3_MSK) == PCI_CFG_HFS_1_D0I3_MSK); @@ -233,6 +239,8 @@ static void mei_me_hw_config(struct mei_device *dev) if (reg & H_D0I3C_I3) hw->pg_state = MEI_PG_ON; } + + return 0; } /** diff --git a/drivers/misc/mei/hw-me.h b/drivers/misc/mei/hw-me.h index c45b32a..3352d19 100644 --- a/drivers/misc/mei/hw-me.h +++ b/drivers/misc/mei/hw-me.h @@ -46,6 +46,7 @@ struct mei_cfg { * @pg_state: power gating state * @d0i3_supported: di03 support * @hbuf_depth: depth of hardware host/write buffer in slots + * @read_fws: read FW status register handler */ struct mei_me_hw { const struct mei_cfg *cfg; @@ -54,6 +55,7 @@ struct mei_me_hw { enum mei_pg_state pg_state; bool d0i3_supported; u8 hbuf_depth; + int (*read_fws)(const struct mei_device *dev, int where, u32 *val); }; #define to_me_hw(dev) (struct mei_me_hw *)((dev)->hw) diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c index 5e58656..785b260 100644 --- a/drivers/misc/mei/hw-txe.c +++ b/drivers/misc/mei/hw-txe.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Copyright (c) 2013-2014, Intel Corporation. All rights reserved. + * Copyright (c) 2013-2019, Intel Corporation. All rights reserved. * Intel Management Engine Interface (Intel MEI) Linux driver */ @@ -660,14 +660,16 @@ static int mei_txe_fw_status(struct mei_device *dev, } /** - * mei_txe_hw_config - configure hardware at the start of the devices + * mei_txe_hw_config - configure hardware at the start of the devices * * @dev: the device structure * * Configure hardware at the start of the device should be done only * once at the device probe time + * + * Return: always 0 */ -static void mei_txe_hw_config(struct mei_device *dev) +static int mei_txe_hw_config(struct mei_device *dev) { struct mei_txe_hw *hw = to_txe_hw(dev); @@ -677,6 +679,8 @@ static void mei_txe_hw_config(struct mei_device *dev) dev_dbg(dev->dev, "aliveness_resp = 0x%08x, readiness = 0x%08x.\n", hw->aliveness, hw->readiness); + + return 0; } /** diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c index b9fef773..bcee777 100644 --- a/drivers/misc/mei/init.c +++ b/drivers/misc/mei/init.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Copyright (c) 2012-2018, Intel Corporation. All rights reserved. + * Copyright (c) 2012-2019, Intel Corporation. All rights reserved. * Intel Management Engine Interface (Intel MEI) Linux driver */ @@ -190,7 +190,9 @@ int mei_start(struct mei_device *dev) /* acknowledge interrupt and stop interrupts */ mei_clear_interrupts(dev); - mei_hw_config(dev); + ret = mei_hw_config(dev); + if (ret) + goto err; dev_dbg(dev->dev, "reset in start the mei device.\n"); diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h index 0f21411..e0ac660 100644 --- a/drivers/misc/mei/mei_dev.h +++ b/drivers/misc/mei/mei_dev.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0 */ /* - * Copyright (c) 2003-2018, Intel Corporation. All rights reserved. + * Copyright (c) 2003-2019, Intel Corporation. All rights reserved. * Intel Management Engine Interface (Intel MEI) Linux driver */ @@ -287,7 +287,7 @@ struct mei_hw_ops { bool (*hw_is_ready)(struct mei_device *dev); int (*hw_reset)(struct mei_device *dev, bool enable); int (*hw_start)(struct mei_device *dev); - void (*hw_config)(struct mei_device *dev); + int (*hw_config)(struct mei_device *dev); int (*fw_status)(struct mei_device *dev, struct mei_fw_status *fw_sts); enum mei_pg_state (*pg_state)(struct mei_device *dev); @@ -614,9 +614,9 @@ void mei_irq_compl_handler(struct mei_device *dev, struct list_head *cmpl_list); */ -static inline void mei_hw_config(struct mei_device *dev) +static inline int mei_hw_config(struct mei_device *dev) { - dev->ops->hw_config(dev); + return dev->ops->hw_config(dev); } static inline enum mei_pg_state mei_pg_state(struct mei_device *dev) diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c index 6233b3c..1de6daf 100644 --- a/drivers/misc/mei/pci-me.c +++ b/drivers/misc/mei/pci-me.c @@ -121,6 +121,13 @@ static inline void mei_me_set_pm_domain(struct mei_device *dev) {} static inline void mei_me_unset_pm_domain(struct mei_device *dev) {} #endif /* CONFIG_PM */ +static int mei_me_read_fws(const struct mei_device *dev, int where, u32 *val) +{ + struct pci_dev *pdev = to_pci_dev(dev->dev); + + return pci_read_config_dword(pdev, where, val); +} + /** * mei_me_quirk_probe - probe for devices that doesn't valid ME interface * @@ -200,6 +207,7 @@ static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent) hw = to_me_hw(dev); hw->mem_addr = pcim_iomap_table(pdev)[0]; hw->irq = pdev->irq; + hw->read_fws = mei_me_read_fws; pci_enable_msi(pdev); -- 2.7.4