mmc: Driver for CB710/720 memory card reader (MMC part)
The code is divided in two parts. There is a virtual 'bus' driver that handles PCI device and registers three new devices one per card reader type. The other driver handles SD/MMC part of the reader. Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: Pierre Ossman <pierre@ossman.eu>
This commit is contained in:
Michał Mirosław
committed by
Pierre Ossman
Pierre Ossman
parent
8385f9cb7f
commit
5f5bac8272
238
include/linux/cb710.h
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238
include/linux/cb710.h
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/*
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* cb710/cb710.h
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*
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* Copyright by Michał Mirosław, 2008-2009
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef LINUX_CB710_DRIVER_H
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#define LINUX_CB710_DRIVER_H
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#ifdef CONFIG_CB710_DEBUG
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#define DEBUG
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#endif
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/* verify assumptions on platform_device framework */
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#define CONFIG_CB710_DEBUG_ASSUMPTIONS
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/mmc/host.h>
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struct cb710_slot;
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typedef int (*cb710_irq_handler_t)(struct cb710_slot *);
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/* per-virtual-slot structure */
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struct cb710_slot {
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struct platform_device pdev;
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void __iomem *iobase;
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cb710_irq_handler_t irq_handler;
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};
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/* per-device structure */
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struct cb710_chip {
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struct pci_dev *pdev;
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void __iomem *iobase;
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unsigned platform_id;
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#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
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atomic_t slot_refs_count;
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#endif
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unsigned slot_mask;
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unsigned slots;
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spinlock_t irq_lock;
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struct cb710_slot slot[0];
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};
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/* NOTE: cb710_chip.slots is modified only during device init/exit and
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* they are all serialized wrt themselves */
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/* cb710_chip.slot_mask values */
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#define CB710_SLOT_MMC 1
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#define CB710_SLOT_MS 2
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#define CB710_SLOT_SM 4
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/* slot port accessors - so the logic is more clear in the code */
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#define CB710_PORT_ACCESSORS(t) \
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static inline void cb710_write_port_##t(struct cb710_slot *slot, \
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unsigned port, u##t value) \
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{ \
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iowrite##t(value, slot->iobase + port); \
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} \
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\
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static inline u##t cb710_read_port_##t(struct cb710_slot *slot, \
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unsigned port) \
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{ \
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return ioread##t(slot->iobase + port); \
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} \
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\
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static inline void cb710_modify_port_##t(struct cb710_slot *slot, \
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unsigned port, u##t set, u##t clear) \
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{ \
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iowrite##t( \
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(ioread##t(slot->iobase + port) & ~clear)|set, \
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slot->iobase + port); \
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}
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CB710_PORT_ACCESSORS(8)
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CB710_PORT_ACCESSORS(16)
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CB710_PORT_ACCESSORS(32)
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void cb710_pci_update_config_reg(struct pci_dev *pdev,
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int reg, uint32_t and, uint32_t xor);
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void cb710_set_irq_handler(struct cb710_slot *slot,
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cb710_irq_handler_t handler);
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/* some device struct walking */
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static inline struct cb710_slot *cb710_pdev_to_slot(
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struct platform_device *pdev)
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{
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return container_of(pdev, struct cb710_slot, pdev);
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}
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static inline struct cb710_chip *cb710_slot_to_chip(struct cb710_slot *slot)
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{
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return dev_get_drvdata(slot->pdev.dev.parent);
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}
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static inline struct device *cb710_slot_dev(struct cb710_slot *slot)
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{
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return &slot->pdev.dev;
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}
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static inline struct device *cb710_chip_dev(struct cb710_chip *chip)
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{
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return &chip->pdev->dev;
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}
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/* debugging aids */
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#ifdef CONFIG_CB710_DEBUG
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void cb710_dump_regs(struct cb710_chip *chip, unsigned dump);
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#else
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#define cb710_dump_regs(c, d) do {} while (0)
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#endif
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#define CB710_DUMP_REGS_MMC 0x0F
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#define CB710_DUMP_REGS_MS 0x30
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#define CB710_DUMP_REGS_SM 0xC0
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#define CB710_DUMP_REGS_ALL 0xFF
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#define CB710_DUMP_REGS_MASK 0xFF
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#define CB710_DUMP_ACCESS_8 0x100
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#define CB710_DUMP_ACCESS_16 0x200
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#define CB710_DUMP_ACCESS_32 0x400
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#define CB710_DUMP_ACCESS_ALL 0x700
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#define CB710_DUMP_ACCESS_MASK 0x700
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#endif /* LINUX_CB710_DRIVER_H */
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/*
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* cb710/sgbuf2.h
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*
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* Copyright by Michał Mirosław, 2008-2009
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef LINUX_CB710_SG_H
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#define LINUX_CB710_SG_H
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#include <linux/highmem.h>
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#include <linux/scatterlist.h>
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/**
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* cb710_sg_miter_stop_writing - stop mapping iteration after writing
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* @miter: sg mapping iter to be stopped
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*
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* Description:
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* Stops mapping iterator @miter. @miter should have been started
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* started using sg_miter_start(). A stopped iteration can be
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* resumed by calling sg_miter_next() on it. This is useful when
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* resources (kmap) need to be released during iteration.
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*
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* This is a convenience wrapper that will be optimized out for arches
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* that don't need flush_kernel_dcache_page().
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*
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* Context:
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* IRQ disabled if the SG_MITER_ATOMIC is set. Don't care otherwise.
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*/
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static inline void cb710_sg_miter_stop_writing(struct sg_mapping_iter *miter)
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{
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if (miter->page)
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flush_kernel_dcache_page(miter->page);
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sg_miter_stop(miter);
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}
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/*
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* 32-bit PIO mapping sg iterator
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*
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* Hides scatterlist access issues - fragment boundaries, alignment, page
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* mapping - for drivers using 32-bit-word-at-a-time-PIO (ie. PCI devices
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* without DMA support).
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*
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* Best-case reading (transfer from device):
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* sg_miter_start();
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* cb710_sg_dwiter_write_from_io();
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* cb710_sg_miter_stop_writing();
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*
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* Best-case writing (transfer to device):
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* sg_miter_start();
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* cb710_sg_dwiter_read_to_io();
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* sg_miter_stop();
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*/
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uint32_t cb710_sg_dwiter_read_next_block(struct sg_mapping_iter *miter);
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void cb710_sg_dwiter_write_next_block(struct sg_mapping_iter *miter, uint32_t data);
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/**
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* cb710_sg_dwiter_write_from_io - transfer data to mapped buffer from 32-bit IO port
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* @miter: sg mapping iter
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* @port: PIO port - IO or MMIO address
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* @count: number of 32-bit words to transfer
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*
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* Description:
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* Reads @count 32-bit words from register @port and stores it in
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* buffer iterated by @miter. Data that would overflow the buffer
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* is silently ignored. Iterator is advanced by 4*@count bytes
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* or to the buffer's end whichever is closer.
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*
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* Context:
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* IRQ disabled if the SG_MITER_ATOMIC is set. Don't care otherwise.
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*/
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static inline void cb710_sg_dwiter_write_from_io(struct sg_mapping_iter *miter,
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void __iomem *port, size_t count)
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{
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while (count-- > 0)
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cb710_sg_dwiter_write_next_block(miter, ioread32(port));
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}
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/**
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* cb710_sg_dwiter_read_to_io - transfer data to 32-bit IO port from mapped buffer
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* @miter: sg mapping iter
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* @port: PIO port - IO or MMIO address
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* @count: number of 32-bit words to transfer
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*
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* Description:
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* Writes @count 32-bit words to register @port from buffer iterated
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* through @miter. If buffer ends before @count words are written
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* missing data is replaced by zeroes. @miter is advanced by 4*@count
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* bytes or to the buffer's end whichever is closer.
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*
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* Context:
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* IRQ disabled if the SG_MITER_ATOMIC is set. Don't care otherwise.
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*/
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static inline void cb710_sg_dwiter_read_to_io(struct sg_mapping_iter *miter,
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void __iomem *port, size_t count)
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{
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while (count-- > 0)
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iowrite32(cb710_sg_dwiter_read_next_block(miter), port);
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}
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#endif /* LINUX_CB710_SG_H */
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