tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * cb710/cb710.h
3 *
4 * Copyright by Michał Mirosław, 2008-2009
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#ifndef LINUX_CB710_DRIVER_H
11#define LINUX_CB710_DRIVER_H
12
13#include <linux/io.h>
14#include <linux/interrupt.h>
15#include <linux/spinlock.h>
16#include <linux/pci.h>
17#include <linux/platform_device.h>
18#include <linux/mmc/host.h>
19
20struct cb710_slot;
21
22typedef int (*cb710_irq_handler_t)(struct cb710_slot *);
23
24/* per-virtual-slot structure */
25struct cb710_slot {
26 struct platform_device pdev;
27 void __iomem *iobase;
28 cb710_irq_handler_t irq_handler;
29};
30
31/* per-device structure */
32struct cb710_chip {
33 struct pci_dev *pdev;
34 void __iomem *iobase;
35 unsigned platform_id;
36#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
37 atomic_t slot_refs_count;
38#endif
39 unsigned slot_mask;
40 unsigned slots;
41 spinlock_t irq_lock;
42 struct cb710_slot slot[0];
43};
44
45/* NOTE: cb710_chip.slots is modified only during device init/exit and
46 * they are all serialized wrt themselves */
47
48/* cb710_chip.slot_mask values */
49#define CB710_SLOT_MMC 1
50#define CB710_SLOT_MS 2
51#define CB710_SLOT_SM 4
52
53/* slot port accessors - so the logic is more clear in the code */
54#define CB710_PORT_ACCESSORS(t) \
55static inline void cb710_write_port_##t(struct cb710_slot *slot, \
56 unsigned port, u##t value) \
57{ \
58 iowrite##t(value, slot->iobase + port); \
59} \
60 \
61static inline u##t cb710_read_port_##t(struct cb710_slot *slot, \
62 unsigned port) \
63{ \
64 return ioread##t(slot->iobase + port); \
65} \
66 \
67static inline void cb710_modify_port_##t(struct cb710_slot *slot, \
68 unsigned port, u##t set, u##t clear) \
69{ \
70 iowrite##t( \
71 (ioread##t(slot->iobase + port) & ~clear)|set, \
72 slot->iobase + port); \
73}
74
75CB710_PORT_ACCESSORS(8)
76CB710_PORT_ACCESSORS(16)
77CB710_PORT_ACCESSORS(32)
78
79void cb710_pci_update_config_reg(struct pci_dev *pdev,
80 int reg, uint32_t and, uint32_t xor);
81void cb710_set_irq_handler(struct cb710_slot *slot,
82 cb710_irq_handler_t handler);
83
84/* some device struct walking */
85
86static inline struct cb710_slot *cb710_pdev_to_slot(
87 struct platform_device *pdev)
88{
89 return container_of(pdev, struct cb710_slot, pdev);
90}
91
92static inline struct cb710_chip *cb710_slot_to_chip(struct cb710_slot *slot)
93{
94 return dev_get_drvdata(slot->pdev.dev.parent);
95}
96
97static inline struct device *cb710_slot_dev(struct cb710_slot *slot)
98{
99 return &slot->pdev.dev;
100}
101
102static inline struct device *cb710_chip_dev(struct cb710_chip *chip)
103{
104 return &chip->pdev->dev;
105}
106
107/* debugging aids */
108
109#ifdef CONFIG_CB710_DEBUG
110void cb710_dump_regs(struct cb710_chip *chip, unsigned dump);
111#else
112#define cb710_dump_regs(c, d) do {} while (0)
113#endif
114
115#define CB710_DUMP_REGS_MMC 0x0F
116#define CB710_DUMP_REGS_MS 0x30
117#define CB710_DUMP_REGS_SM 0xC0
118#define CB710_DUMP_REGS_ALL 0xFF
119#define CB710_DUMP_REGS_MASK 0xFF
120
121#define CB710_DUMP_ACCESS_8 0x100
122#define CB710_DUMP_ACCESS_16 0x200
123#define CB710_DUMP_ACCESS_32 0x400
124#define CB710_DUMP_ACCESS_ALL 0x700
125#define CB710_DUMP_ACCESS_MASK 0x700
126
127#endif /* LINUX_CB710_DRIVER_H */
128/*
129 * cb710/sgbuf2.h
130 *
131 * Copyright by Michał Mirosław, 2008-2009
132 *
133 * This program is free software; you can redistribute it and/or modify
134 * it under the terms of the GNU General Public License version 2 as
135 * published by the Free Software Foundation.
136 */
137#ifndef LINUX_CB710_SG_H
138#define LINUX_CB710_SG_H
139
140#include <linux/highmem.h>
141#include <linux/scatterlist.h>
142
143/**
144 * cb710_sg_miter_stop_writing - stop mapping iteration after writing
145 * @miter: sg mapping iter to be stopped
146 *
147 * Description:
148 * Stops mapping iterator @miter. @miter should have been started
149 * started using sg_miter_start(). A stopped iteration can be
150 * resumed by calling sg_miter_next() on it. This is useful when
151 * resources (kmap) need to be released during iteration.
152 *
153 * This is a convenience wrapper that will be optimized out for arches
154 * that don't need flush_kernel_dcache_page().
155 *
156 * Context:
157 * IRQ disabled if the SG_MITER_ATOMIC is set. Don't care otherwise.
158 */
159static inline void cb710_sg_miter_stop_writing(struct sg_mapping_iter *miter)
160{
161 if (miter->page)
162 flush_kernel_dcache_page(miter->page);
163 sg_miter_stop(miter);
164}
165
166/*
167 * 32-bit PIO mapping sg iterator
168 *
169 * Hides scatterlist access issues - fragment boundaries, alignment, page
170 * mapping - for drivers using 32-bit-word-at-a-time-PIO (ie. PCI devices
171 * without DMA support).
172 *
173 * Best-case reading (transfer from device):
174 * sg_miter_start();
175 * cb710_sg_dwiter_write_from_io();
176 * cb710_sg_miter_stop_writing();
177 *
178 * Best-case writing (transfer to device):
179 * sg_miter_start();
180 * cb710_sg_dwiter_read_to_io();
181 * sg_miter_stop();
182 */
183
184uint32_t cb710_sg_dwiter_read_next_block(struct sg_mapping_iter *miter);
185void cb710_sg_dwiter_write_next_block(struct sg_mapping_iter *miter, uint32_t data);
186
187/**
188 * cb710_sg_dwiter_write_from_io - transfer data to mapped buffer from 32-bit IO port
189 * @miter: sg mapping iter
190 * @port: PIO port - IO or MMIO address
191 * @count: number of 32-bit words to transfer
192 *
193 * Description:
194 * Reads @count 32-bit words from register @port and stores it in
195 * buffer iterated by @miter. Data that would overflow the buffer
196 * is silently ignored. Iterator is advanced by 4*@count bytes
197 * or to the buffer's end whichever is closer.
198 *
199 * Context:
200 * IRQ disabled if the SG_MITER_ATOMIC is set. Don't care otherwise.
201 */
202static inline void cb710_sg_dwiter_write_from_io(struct sg_mapping_iter *miter,
203 void __iomem *port, size_t count)
204{
205 while (count-- > 0)
206 cb710_sg_dwiter_write_next_block(miter, ioread32(port));
207}
208
209/**
210 * cb710_sg_dwiter_read_to_io - transfer data to 32-bit IO port from mapped buffer
211 * @miter: sg mapping iter
212 * @port: PIO port - IO or MMIO address
213 * @count: number of 32-bit words to transfer
214 *
215 * Description:
216 * Writes @count 32-bit words to register @port from buffer iterated
217 * through @miter. If buffer ends before @count words are written
218 * missing data is replaced by zeroes. @miter is advanced by 4*@count
219 * bytes or to the buffer's end whichever is closer.
220 *
221 * Context:
222 * IRQ disabled if the SG_MITER_ATOMIC is set. Don't care otherwise.
223 */
224static inline void cb710_sg_dwiter_read_to_io(struct sg_mapping_iter *miter,
225 void __iomem *port, size_t count)
226{
227 while (count-- > 0)
228 iowrite32(cb710_sg_dwiter_read_next_block(miter), port);
229}
230
231#endif /* LINUX_CB710_SG_H */