5bee27aa41
The Primary-to-Sideband bus (P2SB) is used to access various peripherals through memory-mapped I/O in a large chunk of PCI space. The space is segmented into different channels and peripherals are accessed by device-specific means within those channels. Devices should be added in the device tree as subnodes of the p2sb. This adds a uclass and enables it for sandbox. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2019 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#ifndef __p2sb_h
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#define __p2sb_h
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/* Port Id lives in bits 23:16 and register offset lives in 15:0 of address */
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#define PCR_PORTID_SHIFT 16
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/**
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* struct p2sb_child_platdata - Information about each child of a p2sb device
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*
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* @pid: Port ID for this child
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*/
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struct p2sb_child_platdata {
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uint pid;
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};
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/**
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* struct p2sb_uc_priv - information for the uclass about each device
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*
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* This must be set up by the driver when it is probed
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*
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* @mmio_base: Base address of P2SB region
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*/
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struct p2sb_uc_priv {
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uint mmio_base;
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};
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/**
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* struct p2sb_ops - Operations for the P2SB (none at present)
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*/
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struct p2sb_ops {
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};
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#define p2sb_get_ops(dev) ((struct p2sb_ops *)(dev)->driver->ops)
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/**
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* pcr_read32/16/8() - Read from a PCR device
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*
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* Reads data from a PCR device within the P2SB
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*
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* @dev: Device to read from
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* @offset: Offset within device to read
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* @return value read
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*/
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uint pcr_read32(struct udevice *dev, uint offset);
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uint pcr_read16(struct udevice *dev, uint offset);
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uint pcr_read8(struct udevice *dev, uint offset);
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/**
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* pcr_read32/16/8() - Write to a PCR device
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*
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* Writes data to a PCR device within the P2SB
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*
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* @dev: Device to write to
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* @offset: Offset within device to write
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* @data: Data to write
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*/
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void pcr_write32(struct udevice *dev, uint offset, uint data);
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void pcr_write16(struct udevice *dev, uint offset, uint data);
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void pcr_write8(struct udevice *dev, uint offset, uint data);
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/**
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* pcr_clrsetbits32/16/8() - Update a PCR device
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*
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* Updates dat in a PCR device within the P2SB
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*
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* This reads from the device, clears and set bits, then writes back.
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*
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* new_data = (old_data & ~clr) | set
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*
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* @dev: Device to update
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* @offset: Offset within device to update
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* @clr: Bits to clear after reading
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* @set: Bits to set before writing
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*/
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void pcr_clrsetbits32(struct udevice *dev, uint offset, uint clr, uint set);
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void pcr_clrsetbits16(struct udevice *dev, uint offset, uint clr, uint set);
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void pcr_clrsetbits8(struct udevice *dev, uint offset, uint clr, uint set);
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static inline void pcr_setbits32(struct udevice *dev, uint offset, uint set)
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{
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return pcr_clrsetbits32(dev, offset, 0, set);
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}
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static inline void pcr_setbits16(struct udevice *dev, uint offset, uint set)
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{
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return pcr_clrsetbits16(dev, offset, 0, set);
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}
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static inline void pcr_setbits8(struct udevice *dev, uint offset, uint set)
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{
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return pcr_clrsetbits8(dev, offset, 0, set);
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}
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static inline void pcr_clrbits32(struct udevice *dev, uint offset, uint clr)
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{
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return pcr_clrsetbits32(dev, offset, clr, 0);
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}
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static inline void pcr_clrbits16(struct udevice *dev, uint offset, uint clr)
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{
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return pcr_clrsetbits16(dev, offset, clr, 0);
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}
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static inline void pcr_clrbits8(struct udevice *dev, uint offset, uint clr)
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{
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return pcr_clrsetbits8(dev, offset, clr, 0);
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}
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/**
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* p2sb_set_port_id() - Set the port ID for a p2sb child device
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*
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* This must be called in a device's bind() method when OF_PLATDATA is used
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* since the uclass cannot access the device's of-platdata.
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*
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* @dev: Child device (whose parent is UCLASS_P2SB)
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* @portid: Port ID of child device
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* @return 0 if OK, -ENODEV is the p2sb device could not be found
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*/
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int p2sb_set_port_id(struct udevice *dev, int portid);
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/**
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* p2sb_get_port_id() - Get the port ID for a p2sb child device
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*
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* @dev: Child device (whose parent is UCLASS_P2SB)
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* @return Port ID of that child
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*/
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int p2sb_get_port_id(struct udevice *dev);
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#endif
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