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authorMichał Mirosław <mirq-linux@rere.qmqm.pl>2009-05-22 14:33:59 -0400
committerPierre Ossman <pierre@ossman.eu>2009-06-13 16:42:58 -0400
commit5f5bac8272be791b67c7b7b411e7c8c5847e598a (patch)
tree30fa0cde7c7c8a879bc26f04155f254df194ea40 /drivers
parent8385f9cb7f12ef6a5261fa76f1a1b612280c94f7 (diff)
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/misc/Kconfig1
-rw-r--r--drivers/misc/Makefile1
-rw-r--r--drivers/misc/cb710/Kconfig21
-rw-r--r--drivers/misc/cb710/Makefile4
-rw-r--r--drivers/misc/cb710/core.c357
-rw-r--r--drivers/misc/cb710/debug.c119
-rw-r--r--drivers/misc/cb710/sgbuf2.c150
-rw-r--r--drivers/mmc/host/Kconfig13
-rw-r--r--drivers/mmc/host/Makefile1
-rw-r--r--drivers/mmc/host/cb710-mmc.c804
-rw-r--r--drivers/mmc/host/cb710-mmc.h104
11 files changed, 1575 insertions, 0 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 6d1ac180f6ee..68ab39d7cb35 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -235,5 +235,6 @@ config ISL29003
235 235
236source "drivers/misc/c2port/Kconfig" 236source "drivers/misc/c2port/Kconfig"
237source "drivers/misc/eeprom/Kconfig" 237source "drivers/misc/eeprom/Kconfig"
238source "drivers/misc/cb710/Kconfig"
238 239
239endif # MISC_DEVICES 240endif # MISC_DEVICES
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 7871f05dcb9b..36f733cd60e6 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -21,3 +21,4 @@ obj-$(CONFIG_HP_ILO) += hpilo.o
21obj-$(CONFIG_ISL29003) += isl29003.o 21obj-$(CONFIG_ISL29003) += isl29003.o
22obj-$(CONFIG_C2PORT) += c2port/ 22obj-$(CONFIG_C2PORT) += c2port/
23obj-y += eeprom/ 23obj-y += eeprom/
24obj-y += cb710/
diff --git a/drivers/misc/cb710/Kconfig b/drivers/misc/cb710/Kconfig
new file mode 100644
index 000000000000..0b55079774c8
--- /dev/null
+++ b/drivers/misc/cb710/Kconfig
@@ -0,0 +1,21 @@
1config CB710_CORE
2 tristate "ENE CB710/720 Flash memory card reader support"
3 depends on PCI
4 help
5 This option enables support for PCI ENE CB710/720 Flash memory card
6 reader found in some laptops (ie. some versions of HP Compaq nx9500).
7
8 You will also have to select some flash card format drivers (MMC/SD,
9 MemoryStick).
10
11 This driver can also be built as a module. If so, the module
12 will be called cb710.
13
14config CB710_DEBUG
15 bool "Enable driver debugging"
16 depends on CB710_CORE != n
17 default n
18 help
19 This is an option for use by developers; most people should
20 say N here. This adds a lot of debugging output to dmesg.
21
diff --git a/drivers/misc/cb710/Makefile b/drivers/misc/cb710/Makefile
new file mode 100644
index 000000000000..62d51acfecaf
--- /dev/null
+++ b/drivers/misc/cb710/Makefile
@@ -0,0 +1,4 @@
1obj-$(CONFIG_CB710_CORE) += cb710.o
2
3cb710-y := core.o sgbuf2.o
4cb710-$(CONFIG_CB710_DEBUG) += debug.o
diff --git a/drivers/misc/cb710/core.c b/drivers/misc/cb710/core.c
new file mode 100644
index 000000000000..b14eab0f2ba5
--- /dev/null
+++ b/drivers/misc/cb710/core.c
@@ -0,0 +1,357 @@
1/*
2 * cb710/core.c
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#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/pci.h>
14#include <linux/spinlock.h>
15#include <linux/idr.h>
16#include <linux/cb710.h>
17
18static DEFINE_IDA(cb710_ida);
19static DEFINE_SPINLOCK(cb710_ida_lock);
20
21void cb710_pci_update_config_reg(struct pci_dev *pdev,
22 int reg, uint32_t mask, uint32_t xor)
23{
24 u32 rval;
25
26 pci_read_config_dword(pdev, reg, &rval);
27 rval = (rval & mask) ^ xor;
28 pci_write_config_dword(pdev, reg, rval);
29}
30EXPORT_SYMBOL_GPL(cb710_pci_update_config_reg);
31
32/* Some magic writes based on Windows driver init code */
33static int __devinit cb710_pci_configure(struct pci_dev *pdev)
34{
35 unsigned int devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
36 struct pci_dev *pdev0 = pci_get_slot(pdev->bus, devfn);
37 u32 val;
38
39 cb710_pci_update_config_reg(pdev, 0x48,
40 ~0x000000FF, 0x0000003F);
41
42 pci_read_config_dword(pdev, 0x48, &val);
43 if (val & 0x80000000)
44 return 0;
45
46 if (!pdev0)
47 return -ENODEV;
48
49 if (pdev0->vendor == PCI_VENDOR_ID_ENE
50 && pdev0->device == PCI_DEVICE_ID_ENE_720) {
51 cb710_pci_update_config_reg(pdev0, 0x8C,
52 ~0x00F00000, 0x00100000);
53 cb710_pci_update_config_reg(pdev0, 0xB0,
54 ~0x08000000, 0x08000000);
55 }
56
57 cb710_pci_update_config_reg(pdev0, 0x8C,
58 ~0x00000F00, 0x00000200);
59 cb710_pci_update_config_reg(pdev0, 0x90,
60 ~0x00060000, 0x00040000);
61
62 pci_dev_put(pdev0);
63
64 return 0;
65}
66
67static irqreturn_t cb710_irq_handler(int irq, void *data)
68{
69 struct cb710_chip *chip = data;
70 struct cb710_slot *slot = &chip->slot[0];
71 irqreturn_t handled = IRQ_NONE;
72 unsigned nr;
73
74 spin_lock(&chip->irq_lock); /* incl. smp_rmb() */
75
76 for (nr = chip->slots; nr; ++slot, --nr) {
77 cb710_irq_handler_t handler_func = slot->irq_handler;
78 if (handler_func && handler_func(slot))
79 handled = IRQ_HANDLED;
80 }
81
82 spin_unlock(&chip->irq_lock);
83
84 return handled;
85}
86
87static void cb710_release_slot(struct device *dev)
88{
89#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
90 struct cb710_slot *slot = cb710_pdev_to_slot(to_platform_device(dev));
91 struct cb710_chip *chip = cb710_slot_to_chip(slot);
92
93 /* slot struct can be freed now */
94 atomic_dec(&chip->slot_refs_count);
95#endif
96}
97
98static int __devinit cb710_register_slot(struct cb710_chip *chip,
99 unsigned slot_mask, unsigned io_offset, const char *name)
100{
101 int nr = chip->slots;
102 struct cb710_slot *slot = &chip->slot[nr];
103 int err;
104
105 dev_dbg(cb710_chip_dev(chip),
106 "register: %s.%d; slot %d; mask %d; IO offset: 0x%02X\n",
107 name, chip->platform_id, nr, slot_mask, io_offset);
108
109 /* slot->irq_handler == NULL here; this needs to be
110 * seen before platform_device_register() */
111 ++chip->slots;
112 smp_wmb();
113
114 slot->iobase = chip->iobase + io_offset;
115 slot->pdev.name = name;
116 slot->pdev.id = chip->platform_id;
117 slot->pdev.dev.parent = &chip->pdev->dev;
118 slot->pdev.dev.release = cb710_release_slot;
119
120 err = platform_device_register(&slot->pdev);
121
122#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
123 atomic_inc(&chip->slot_refs_count);
124#endif
125
126 if (err) {
127 /* device_initialize() called from platform_device_register()
128 * wants this on error path */
129 platform_device_put(&slot->pdev);
130
131 /* slot->irq_handler == NULL here anyway, so no lock needed */
132 --chip->slots;
133 return err;
134 }
135
136 chip->slot_mask |= slot_mask;
137
138 return 0;
139}
140
141static void cb710_unregister_slot(struct cb710_chip *chip,
142 unsigned slot_mask)
143{
144 int nr = chip->slots - 1;
145
146 if (!(chip->slot_mask & slot_mask))
147 return;
148
149 platform_device_unregister(&chip->slot[nr].pdev);
150
151 /* complementary to spin_unlock() in cb710_set_irq_handler() */
152 smp_rmb();
153 BUG_ON(chip->slot[nr].irq_handler != NULL);
154
155 /* slot->irq_handler == NULL here, so no lock needed */
156 --chip->slots;
157 chip->slot_mask &= ~slot_mask;
158}
159
160void cb710_set_irq_handler(struct cb710_slot *slot,
161 cb710_irq_handler_t handler)
162{
163 struct cb710_chip *chip = cb710_slot_to_chip(slot);
164 unsigned long flags;
165
166 spin_lock_irqsave(&chip->irq_lock, flags);
167 slot->irq_handler = handler;
168 spin_unlock_irqrestore(&chip->irq_lock, flags);
169}
170EXPORT_SYMBOL_GPL(cb710_set_irq_handler);
171
172#ifdef CONFIG_PM
173
174static int cb710_suspend(struct pci_dev *pdev, pm_message_t state)
175{
176 struct cb710_chip *chip = pci_get_drvdata(pdev);
177
178 free_irq(pdev->irq, chip);
179 pci_save_state(pdev);
180 pci_disable_device(pdev);
181 if (state.event & PM_EVENT_SLEEP)
182 pci_set_power_state(pdev, PCI_D3cold);
183 return 0;
184}
185
186static int cb710_resume(struct pci_dev *pdev)
187{
188 struct cb710_chip *chip = pci_get_drvdata(pdev);
189 int err;
190
191 pci_set_power_state(pdev, PCI_D0);
192 pci_restore_state(pdev);
193 err = pcim_enable_device(pdev);
194 if (err)
195 return err;
196
197 return devm_request_irq(&pdev->dev, pdev->irq,
198 cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
199}
200
201#endif /* CONFIG_PM */
202
203static int __devinit cb710_probe(struct pci_dev *pdev,
204 const struct pci_device_id *ent)
205{
206 struct cb710_chip *chip;
207 unsigned long flags;
208 u32 val;
209 int err;
210 int n = 0;
211
212 err = cb710_pci_configure(pdev);
213 if (err)
214 return err;
215
216 /* this is actually magic... */
217 pci_read_config_dword(pdev, 0x48, &val);
218 if (!(val & 0x80000000)) {
219 pci_write_config_dword(pdev, 0x48, val|0x71000000);
220 pci_read_config_dword(pdev, 0x48, &val);
221 }
222
223 dev_dbg(&pdev->dev, "PCI config[0x48] = 0x%08X\n", val);
224 if (!(val & 0x70000000))
225 return -ENODEV;
226 val = (val >> 28) & 7;
227 if (val & CB710_SLOT_MMC)
228 ++n;
229 if (val & CB710_SLOT_MS)
230 ++n;
231 if (val & CB710_SLOT_SM)
232 ++n;
233
234 chip = devm_kzalloc(&pdev->dev,
235 sizeof(*chip) + n * sizeof(*chip->slot), GFP_KERNEL);
236 if (!chip)
237 return -ENOMEM;
238
239 err = pcim_enable_device(pdev);
240 if (err)
241 return err;
242
243 err = pcim_iomap_regions(pdev, 0x0001, KBUILD_MODNAME);
244 if (err)
245 return err;
246
247 chip->pdev = pdev;
248 chip->iobase = pcim_iomap_table(pdev)[0];
249
250 pci_set_drvdata(pdev, chip);
251
252 err = devm_request_irq(&pdev->dev, pdev->irq,
253 cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
254 if (err)
255 return err;
256
257 do {
258 if (!ida_pre_get(&cb710_ida, GFP_KERNEL))
259 return -ENOMEM;
260
261 spin_lock_irqsave(&cb710_ida_lock, flags);
262 err = ida_get_new(&cb710_ida, &chip->platform_id);
263 spin_unlock_irqrestore(&cb710_ida_lock, flags);
264
265 if (err && err != -EAGAIN)
266 return err;
267 } while (err);
268
269
270 dev_info(&pdev->dev, "id %d, IO 0x%p, IRQ %d\n",
271 chip->platform_id, chip->iobase, pdev->irq);
272
273 if (val & CB710_SLOT_MMC) { /* MMC/SD slot */
274 err = cb710_register_slot(chip,
275 CB710_SLOT_MMC, 0x00, "cb710-mmc");
276 if (err)
277 return err;
278 }
279
280 if (val & CB710_SLOT_MS) { /* MemoryStick slot */
281 err = cb710_register_slot(chip,
282 CB710_SLOT_MS, 0x40, "cb710-ms");
283 if (err)
284 goto unreg_mmc;
285 }
286
287 if (val & CB710_SLOT_SM) { /* SmartMedia slot */
288 err = cb710_register_slot(chip,
289 CB710_SLOT_SM, 0x60, "cb710-sm");
290 if (err)
291 goto unreg_ms;
292 }
293
294 return 0;
295unreg_ms:
296 cb710_unregister_slot(chip, CB710_SLOT_MS);
297unreg_mmc:
298 cb710_unregister_slot(chip, CB710_SLOT_MMC);
299
300#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
301 BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
302#endif
303 return err;
304}
305
306static void __devexit cb710_remove_one(struct pci_dev *pdev)
307{
308 struct cb710_chip *chip = pci_get_drvdata(pdev);
309 unsigned long flags;
310
311 cb710_unregister_slot(chip, CB710_SLOT_SM);
312 cb710_unregister_slot(chip, CB710_SLOT_MS);
313 cb710_unregister_slot(chip, CB710_SLOT_MMC);
314#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
315 BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
316#endif
317
318 spin_lock_irqsave(&cb710_ida_lock, flags);
319 ida_remove(&cb710_ida, chip->platform_id);
320 spin_unlock_irqrestore(&cb710_ida_lock, flags);
321}
322
323static const struct pci_device_id cb710_pci_tbl[] = {
324 { PCI_VENDOR_ID_ENE, PCI_DEVICE_ID_ENE_CB710_FLASH,
325 PCI_ANY_ID, PCI_ANY_ID, },
326 { 0, }
327};
328
329static struct pci_driver cb710_driver = {
330 .name = KBUILD_MODNAME,
331 .id_table = cb710_pci_tbl,
332 .probe = cb710_probe,
333 .remove = __devexit_p(cb710_remove_one),
334#ifdef CONFIG_PM
335 .suspend = cb710_suspend,
336 .resume = cb710_resume,
337#endif
338};
339
340static int __init cb710_init_module(void)
341{
342 return pci_register_driver(&cb710_driver);
343}
344
345static void __exit cb710_cleanup_module(void)
346{
347 pci_unregister_driver(&cb710_driver);
348 ida_destroy(&cb710_ida);
349}
350
351module_init(cb710_init_module);
352module_exit(cb710_cleanup_module);
353
354MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
355MODULE_DESCRIPTION("ENE CB710 memory card reader driver");
356MODULE_LICENSE("GPL");
357MODULE_DEVICE_TABLE(pci, cb710_pci_tbl);
diff --git a/drivers/misc/cb710/debug.c b/drivers/misc/cb710/debug.c
new file mode 100644
index 000000000000..9da11bc620af
--- /dev/null
+++ b/drivers/misc/cb710/debug.c
@@ -0,0 +1,119 @@
1/*
2 * cb710/debug.c
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#include <linux/cb710.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14
15#define CB710_REG_COUNT 0x80
16
17static const u16 allow[CB710_REG_COUNT/16] = {
18 0xFFF0, 0xFFFF, 0xFFFF, 0xFFFF,
19 0xFFF0, 0xFFFF, 0xFFFF, 0xFFFF,
20};
21static const char *const prefix[ARRAY_SIZE(allow)] = {
22 "MMC", "MMC", "MMC", "MMC",
23 "MS?", "MS?", "SM?", "SM?"
24};
25
26static inline int allow_reg_read(unsigned block, unsigned offset, unsigned bits)
27{
28 unsigned mask = (1 << bits/8) - 1;
29 offset *= bits/8;
30 return ((allow[block] >> offset) & mask) == mask;
31}
32
33#define CB710_READ_REGS_TEMPLATE(t) \
34static void cb710_read_regs_##t(void __iomem *iobase, \
35 u##t *reg, unsigned select) \
36{ \
37 unsigned i, j; \
38 \
39 for (i = 0; i < ARRAY_SIZE(allow); ++i, reg += 16/(t/8)) { \
40 if (!select & (1 << i)) \
41 continue; \
42 \
43 for (j = 0; j < 0x10/(t/8); ++j) { \
44 if (!allow_reg_read(i, j, t)) \
45 continue; \
46 reg[j] = ioread##t(iobase \
47 + (i << 4) + (j * (t/8))); \
48 } \
49 } \
50}
51
52static const char cb710_regf_8[] = "%02X";
53static const char cb710_regf_16[] = "%04X";
54static const char cb710_regf_32[] = "%08X";
55static const char cb710_xes[] = "xxxxxxxx";
56
57#define CB710_DUMP_REGS_TEMPLATE(t) \
58static void cb710_dump_regs_##t(struct device *dev, \
59 const u##t *reg, unsigned select) \
60{ \
61 const char *const xp = &cb710_xes[8 - t/4]; \
62 const char *const format = cb710_regf_##t; \
63 \
64 char msg[100], *p; \
65 unsigned i, j; \
66 \
67 for (i = 0; i < ARRAY_SIZE(allow); ++i, reg += 16/(t/8)) { \
68 if (!(select & (1 << i))) \
69 continue; \
70 p = msg; \
71 for (j = 0; j < 0x10/(t/8); ++j) { \
72 *p++ = ' '; \
73 if (j == 8/(t/8)) \
74 *p++ = ' '; \
75 if (allow_reg_read(i, j, t)) \
76 p += sprintf(p, format, reg[j]); \
77 else \
78 p += sprintf(p, "%s", xp); \
79 } \
80 dev_dbg(dev, "%s 0x%02X %s\n", prefix[i], i << 4, msg); \
81 } \
82}
83
84#define CB710_READ_AND_DUMP_REGS_TEMPLATE(t) \
85static void cb710_read_and_dump_regs_##t(struct cb710_chip *chip, \
86 unsigned select) \
87{ \
88 u##t regs[CB710_REG_COUNT/sizeof(u##t)]; \
89 \
90 memset(&regs, 0, sizeof(regs)); \
91 cb710_read_regs_##t(chip->iobase, regs, select); \
92 cb710_dump_regs_##t(cb710_chip_dev(chip), regs, select); \
93}
94
95#define CB710_REG_ACCESS_TEMPLATES(t) \
96 CB710_READ_REGS_TEMPLATE(t) \
97 CB710_DUMP_REGS_TEMPLATE(t) \
98 CB710_READ_AND_DUMP_REGS_TEMPLATE(t)
99
100CB710_REG_ACCESS_TEMPLATES(8)
101CB710_REG_ACCESS_TEMPLATES(16)
102CB710_REG_ACCESS_TEMPLATES(32)
103
104void cb710_dump_regs(struct cb710_chip *chip, unsigned select)
105{
106 if (!(select & CB710_DUMP_REGS_MASK))
107 select = CB710_DUMP_REGS_ALL;
108 if (!(select & CB710_DUMP_ACCESS_MASK))
109 select |= CB710_DUMP_ACCESS_8;
110
111 if (select & CB710_DUMP_ACCESS_32)
112 cb710_read_and_dump_regs_32(chip, select);
113 if (select & CB710_DUMP_ACCESS_16)
114 cb710_read_and_dump_regs_16(chip, select);
115 if (select & CB710_DUMP_ACCESS_8)
116 cb710_read_and_dump_regs_8(chip, select);
117}
118EXPORT_SYMBOL_GPL(cb710_dump_regs);
119
diff --git a/drivers/misc/cb710/sgbuf2.c b/drivers/misc/cb710/sgbuf2.c
new file mode 100644
index 000000000000..d38a7acdb6ec
--- /dev/null
+++ b/drivers/misc/cb710/sgbuf2.c
@@ -0,0 +1,150 @@
1/*
2 * cb710/sgbuf2.c
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#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/cb710.h>
13
14static bool sg_dwiter_next(struct sg_mapping_iter *miter)
15{
16 if (sg_miter_next(miter)) {
17 miter->consumed = 0;
18 return true;
19 } else
20 return false;
21}
22
23static bool sg_dwiter_is_at_end(struct sg_mapping_iter *miter)
24{
25 return miter->length == miter->consumed && !sg_dwiter_next(miter);
26}
27
28static uint32_t sg_dwiter_read_buffer(struct sg_mapping_iter *miter)
29{
30 size_t len, left = 4;
31 uint32_t data;
32 void *addr = &data;
33
34 do {
35 len = min(miter->length - miter->consumed, left);
36 memcpy(addr, miter->addr + miter->consumed, len);
37 miter->consumed += len;
38 left -= len;
39 if (!left)
40 return data;
41 addr += len;
42 } while (sg_dwiter_next(miter));
43
44 memset(addr, 0, left);
45 return data;
46}
47
48static inline bool needs_unaligned_copy(const void *ptr)
49{
50#ifdef HAVE_EFFICIENT_UNALIGNED_ACCESS
51 return false;
52#else
53 return ((ptr - NULL) & 3) != 0;
54#endif
55}
56
57static bool sg_dwiter_get_next_block(struct sg_mapping_iter *miter, uint32_t **ptr)
58{
59 size_t len;
60
61 if (sg_dwiter_is_at_end(miter))
62 return true;
63
64 len = miter->length - miter->consumed;
65
66 if (likely(len >= 4 && !needs_unaligned_copy(
67 miter->addr + miter->consumed))) {
68 *ptr = miter->addr + miter->consumed;
69 miter->consumed += 4;
70 return true;
71 }
72
73 return false;
74}
75
76/**
77 * cb710_sg_dwiter_read_next_block() - get next 32-bit word from sg buffer
78 * @miter: sg mapping iterator used for reading
79 *
80 * Description:
81 * Returns 32-bit word starting at byte pointed to by @miter@
82 * handling any alignment issues. Bytes past the buffer's end
83 * are not accessed (read) but are returned as zeroes. @miter@
84 * is advanced by 4 bytes or to the end of buffer whichever is
85 * closer.
86 *
87 * Context:
88 * Same requirements as in sg_miter_next().
89 *
90 * Returns:
91 * 32-bit word just read.
92 */
93uint32_t cb710_sg_dwiter_read_next_block(struct sg_mapping_iter *miter)
94{
95 uint32_t *ptr = NULL;
96
97 if (likely(sg_dwiter_get_next_block(miter, &ptr)))
98 return ptr ? *ptr : 0;
99
100 return sg_dwiter_read_buffer(miter);
101}
102EXPORT_SYMBOL_GPL(cb710_sg_dwiter_read_next_block);
103
104static void sg_dwiter_write_slow(struct sg_mapping_iter *miter, uint32_t data)
105{
106 size_t len, left = 4;
107 void *addr = &data;
108
109 do {
110 len = min(miter->length - miter->consumed, left);
111 memcpy(miter->addr, addr, len);
112 miter->consumed += len;
113 left -= len;
114 if (!left)
115 return;
116 addr += len;
117 flush_kernel_dcache_page(miter->page);
118 } while (sg_dwiter_next(miter));
119}
120
121/**
122 * cb710_sg_dwiter_write_next_block() - write next 32-bit word to sg buffer
123 * @miter: sg mapping iterator used for writing
124 *
125 * Description:
126 * Writes 32-bit word starting at byte pointed to by @miter@
127 * handling any alignment issues. Bytes which would be written
128 * past the buffer's end are silently discarded. @miter@ is
129 * advanced by 4 bytes or to the end of buffer whichever is closer.
130 *
131 * Context:
132 * Same requirements as in sg_miter_next().
133 */
134void cb710_sg_dwiter_write_next_block(struct sg_mapping_iter *miter, uint32_t data)
135{
136 uint32_t *ptr = NULL;
137
138 if (likely(sg_dwiter_get_next_block(miter, &ptr))) {
139 if (ptr)
140 *ptr = data;
141 else
142 return;
143 } else
144 sg_dwiter_write_slow(miter, data);
145
146 if (miter->length == miter->consumed)
147 flush_kernel_dcache_page(miter->page);
148}
149EXPORT_SYMBOL_GPL(cb710_sg_dwiter_write_next_block);
150
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index b4cf691f3f64..75337e442da9 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -241,3 +241,16 @@ config MMC_TMIO
241 help 241 help
242 This provides support for the SD/MMC cell found in TC6393XB, 242 This provides support for the SD/MMC cell found in TC6393XB,
243 T7L66XB and also ipaq ASIC3 243 T7L66XB and also ipaq ASIC3
244
245config MMC_CB710
246 tristate "ENE CB710 MMC/SD Interface support"
247 depends on PCI
248 select CB710_CORE
249 help
250 This option enables support for MMC/SD part of ENE CB710/720 Flash
251 memory card reader found in some laptops (ie. some versions of
252 HP Compaq nx9500).
253
254 This driver can also be built as a module. If so, the module
255 will be called cb710-mmc.
256
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 970a997620e1..ce9c8b6f0f4b 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -29,4 +29,5 @@ endif
29obj-$(CONFIG_MMC_S3C) += s3cmci.o 29obj-$(CONFIG_MMC_S3C) += s3cmci.o
30obj-$(CONFIG_MMC_SDRICOH_CS) += sdricoh_cs.o 30obj-$(CONFIG_MMC_SDRICOH_CS) += sdricoh_cs.o
31obj-$(CONFIG_MMC_TMIO) += tmio_mmc.o 31obj-$(CONFIG_MMC_TMIO) += tmio_mmc.o
32obj-$(CONFIG_MMC_CB710) += cb710-mmc.o
32 33
diff --git a/drivers/mmc/host/cb710-mmc.c b/drivers/mmc/host/cb710-mmc.c
new file mode 100644
index 000000000000..bc048aae7207
--- /dev/null
+++ b/drivers/mmc/host/cb710-mmc.c
@@ -0,0 +1,804 @@
1/*
2 * cb710/mmc.c
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#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/pci.h>
14#include <linux/delay.h>
15#include "cb710-mmc.h"
16
17static const u8 cb710_clock_divider_log2[8] = {
18/* 1, 2, 4, 8, 16, 32, 128, 512 */
19 0, 1, 2, 3, 4, 5, 7, 9
20};
21#define CB710_MAX_DIVIDER_IDX \
22 (ARRAY_SIZE(cb710_clock_divider_log2) - 1)
23
24static const u8 cb710_src_freq_mhz[16] = {
25 33, 10, 20, 25, 30, 35, 40, 45,
26 50, 55, 60, 65, 70, 75, 80, 85
27};
28
29static void cb710_mmc_set_clock(struct mmc_host *mmc, int hz)
30{
31 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
32 struct pci_dev *pdev = cb710_slot_to_chip(slot)->pdev;
33 u32 src_freq_idx;
34 u32 divider_idx;
35 int src_hz;
36
37 /* this is magic, unverifiable for me, unless I get
38 * MMC card with cables connected to bus signals */
39 pci_read_config_dword(pdev, 0x48, &src_freq_idx);
40 src_freq_idx = (src_freq_idx >> 16) & 0xF;
41 src_hz = cb710_src_freq_mhz[src_freq_idx] * 1000000;
42
43 for (divider_idx = 0; divider_idx < CB710_MAX_DIVIDER_IDX; ++divider_idx) {
44 if (hz >= src_hz >> cb710_clock_divider_log2[divider_idx])
45 break;
46 }
47
48 if (src_freq_idx)
49 divider_idx |= 0x8;
50
51 cb710_pci_update_config_reg(pdev, 0x40, ~0xF0000000, divider_idx << 28);
52
53 dev_dbg(cb710_slot_dev(slot),
54 "clock set to %d Hz, wanted %d Hz; flag = %d\n",
55 src_hz >> cb710_clock_divider_log2[divider_idx & 7],
56 hz, (divider_idx & 8) != 0);
57}
58
59static void __cb710_mmc_enable_irq(struct cb710_slot *slot,
60 unsigned short enable, unsigned short mask)
61{
62 /* clear global IE
63 * - it gets set later if any interrupt sources are enabled */
64 mask |= CB710_MMC_IE_IRQ_ENABLE;
65
66 /* look like interrupt is fired whenever
67 * WORD[0x0C] & WORD[0x10] != 0;
68 * -> bit 15 port 0x0C seems to be global interrupt enable
69 */
70
71 enable = (cb710_read_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT)
72 & ~mask) | enable;
73
74 if (enable)
75 enable |= CB710_MMC_IE_IRQ_ENABLE;
76
77 cb710_write_port_16(slot, CB710_MMC_IRQ_ENABLE_PORT, enable);
78}
79
80static void cb710_mmc_enable_irq(struct cb710_slot *slot,
81 unsigned short enable, unsigned short mask)
82{
83 struct cb710_mmc_reader *reader = mmc_priv(cb710_slot_to_mmc(slot));
84 unsigned long flags;
85
86 spin_lock_irqsave(&reader->irq_lock, flags);
87 /* this is the only thing irq_lock protects */
88 __cb710_mmc_enable_irq(slot, enable, mask);
89 spin_unlock_irqrestore(&reader->irq_lock, flags);
90}
91
92static void cb710_mmc_reset_events(struct cb710_slot *slot)
93{
94 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT, 0xFF);
95 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT, 0xFF);
96 cb710_write_port_8(slot, CB710_MMC_STATUS2_PORT, 0xFF);
97}
98
99static int cb710_mmc_is_card_inserted(struct cb710_slot *slot)
100{
101 return cb710_read_port_8(slot, CB710_MMC_STATUS3_PORT)
102 & CB710_MMC_S3_CARD_DETECTED;
103}
104
105static void cb710_mmc_enable_4bit_data(struct cb710_slot *slot, int enable)
106{
107 dev_dbg(cb710_slot_dev(slot), "configuring %d-data-line%s mode\n",
108 enable ? 4 : 1, enable ? "s" : "");
109 if (enable)
110 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT,
111 CB710_MMC_C1_4BIT_DATA_BUS, 0);
112 else
113 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT,
114 0, CB710_MMC_C1_4BIT_DATA_BUS);
115}
116
117static int cb710_check_event(struct cb710_slot *slot, u8 what)
118{
119 u16 status;
120
121 status = cb710_read_port_16(slot, CB710_MMC_STATUS_PORT);
122
123 if (status & CB710_MMC_S0_FIFO_UNDERFLOW) {
124 /* it is just a guess, so log it */
125 dev_dbg(cb710_slot_dev(slot),
126 "CHECK : ignoring bit 6 in status %04X\n", status);
127 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT,
128 CB710_MMC_S0_FIFO_UNDERFLOW);
129 status &= ~CB710_MMC_S0_FIFO_UNDERFLOW;
130 }
131
132 if (status & CB710_MMC_STATUS_ERROR_EVENTS) {
133 dev_dbg(cb710_slot_dev(slot),
134 "CHECK : returning EIO on status %04X\n", status);
135 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT, status & 0xFF);
136 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT,
137 CB710_MMC_S1_RESET);
138 return -EIO;
139 }
140
141 /* 'what' is a bit in MMC_STATUS1 */
142 if ((status >> 8) & what) {
143 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT, what);
144 return 1;
145 }
146
147 return 0;
148}
149
150static int cb710_wait_for_event(struct cb710_slot *slot, u8 what)
151{
152 int err = 0;
153 unsigned limit = 2000000; /* FIXME: real timeout */
154
155#ifdef CONFIG_CB710_DEBUG
156 u32 e, x;
157 e = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
158#endif
159
160 while (!(err = cb710_check_event(slot, what))) {
161 if (!--limit) {
162 cb710_dump_regs(cb710_slot_to_chip(slot),
163 CB710_DUMP_REGS_MMC);
164 err = -ETIMEDOUT;
165 break;
166 }
167 udelay(1);
168 }
169
170#ifdef CONFIG_CB710_DEBUG
171 x = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
172
173 limit = 2000000 - limit;
174 if (limit > 100)
175 dev_dbg(cb710_slot_dev(slot),
176 "WAIT10: waited %d loops, what %d, entry val %08X, exit val %08X\n",
177 limit, what, e, x);
178#endif
179 return err < 0 ? err : 0;
180}
181
182
183static int cb710_wait_while_busy(struct cb710_slot *slot, uint8_t mask)
184{
185 unsigned limit = 500000; /* FIXME: real timeout */
186 int err = 0;
187
188#ifdef CONFIG_CB710_DEBUG
189 u32 e, x;
190 e = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
191#endif
192
193 while (cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT) & mask) {
194 if (!--limit) {
195 cb710_dump_regs(cb710_slot_to_chip(slot),
196 CB710_DUMP_REGS_MMC);
197 err = -ETIMEDOUT;
198 break;
199 }
200 udelay(1);
201 }
202
203#ifdef CONFIG_CB710_DEBUG
204 x = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
205
206 limit = 500000 - limit;
207 if (limit > 100)
208 dev_dbg(cb710_slot_dev(slot),
209 "WAIT12: waited %d loops, mask %02X, entry val %08X, exit val %08X\n",
210 limit, mask, e, x);
211#endif
212 return 0;
213}
214
215static void cb710_mmc_set_transfer_size(struct cb710_slot *slot,
216 size_t count, size_t blocksize)
217{
218 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
219 cb710_write_port_32(slot, CB710_MMC_TRANSFER_SIZE_PORT,
220 ((count - 1) << 16)|(blocksize - 1));
221
222 dev_vdbg(cb710_slot_dev(slot), "set up for %d block%s of %d bytes\n",
223 count, count == 1 ? "" : "s", blocksize);
224}
225
226static void cb710_mmc_fifo_hack(struct cb710_slot *slot)
227{
228 /* without this, received data is prepended with 8-bytes of zeroes */
229 u32 r1, r2;
230 int ok = 0;
231
232 r1 = cb710_read_port_32(slot, CB710_MMC_DATA_PORT);
233 r2 = cb710_read_port_32(slot, CB710_MMC_DATA_PORT);
234 if (cb710_read_port_8(slot, CB710_MMC_STATUS0_PORT)
235 & CB710_MMC_S0_FIFO_UNDERFLOW) {
236 cb710_write_port_8(slot, CB710_MMC_STATUS0_PORT,
237 CB710_MMC_S0_FIFO_UNDERFLOW);
238 ok = 1;
239 }
240
241 dev_dbg(cb710_slot_dev(slot),
242 "FIFO-read-hack: expected STATUS0 bit was %s\n",
243 ok ? "set." : "NOT SET!");
244 dev_dbg(cb710_slot_dev(slot),
245 "FIFO-read-hack: dwords ignored: %08X %08X - %s\n",
246 r1, r2, (r1|r2) ? "BAD (NOT ZERO)!" : "ok");
247}
248
249static int cb710_mmc_receive_pio(struct cb710_slot *slot,
250 struct sg_mapping_iter *miter, size_t dw_count)
251{
252 if (!(cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT) & CB710_MMC_S2_FIFO_READY)) {
253 int err = cb710_wait_for_event(slot,
254 CB710_MMC_S1_PIO_TRANSFER_DONE);
255 if (err)
256 return err;
257 }
258
259 cb710_sg_dwiter_write_from_io(miter,
260 slot->iobase + CB710_MMC_DATA_PORT, dw_count);
261
262 return 0;
263}
264
265static bool cb710_is_transfer_size_supported(struct mmc_data *data)
266{
267 return !(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8));
268}
269
270static int cb710_mmc_receive(struct cb710_slot *slot, struct mmc_data *data)
271{
272 struct sg_mapping_iter miter;
273 size_t len, blocks = data->blocks;
274 int err = 0;
275
276 /* TODO: I don't know how/if the hardware handles non-16B-boundary blocks
277 * except single 8B block */
278 if (unlikely(data->blksz & 15 && (data->blocks != 1 || data->blksz != 8)))
279 return -EINVAL;
280
281 sg_miter_start(&miter, data->sg, data->sg_len, 0);
282
283 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
284 15, CB710_MMC_C2_READ_PIO_SIZE_MASK);
285
286 cb710_mmc_fifo_hack(slot);
287
288 while (blocks-- > 0) {
289 len = data->blksz;
290
291 while (len >= 16) {
292 err = cb710_mmc_receive_pio(slot, &miter, 4);
293 if (err)
294 goto out;
295 len -= 16;
296 }
297
298 if (!len)
299 continue;
300
301 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
302 len - 1, CB710_MMC_C2_READ_PIO_SIZE_MASK);
303
304 len = (len >= 8) ? 4 : 2;
305 err = cb710_mmc_receive_pio(slot, &miter, len);
306 if (err)
307 goto out;
308 }
309out:
310 cb710_sg_miter_stop_writing(&miter);
311 return err;
312}
313
314static int cb710_mmc_send(struct cb710_slot *slot, struct mmc_data *data)
315{
316 struct sg_mapping_iter miter;
317 size_t len, blocks = data->blocks;
318 int err = 0;
319
320 /* TODO: I don't know how/if the hardware handles multiple
321 * non-16B-boundary blocks */
322 if (unlikely(data->blocks > 1 && data->blksz & 15))
323 return -EINVAL;
324
325 sg_miter_start(&miter, data->sg, data->sg_len, 0);
326
327 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT,
328 0, CB710_MMC_C2_READ_PIO_SIZE_MASK);
329
330 while (blocks-- > 0) {
331 len = (data->blksz + 15) >> 4;
332 do {
333 if (!(cb710_read_port_8(slot, CB710_MMC_STATUS2_PORT)
334 & CB710_MMC_S2_FIFO_EMPTY)) {
335 err = cb710_wait_for_event(slot,
336 CB710_MMC_S1_PIO_TRANSFER_DONE);
337 if (err)
338 goto out;
339 }
340 cb710_sg_dwiter_read_to_io(&miter,
341 slot->iobase + CB710_MMC_DATA_PORT, 4);
342 } while (--len);
343 }
344out:
345 sg_miter_stop(&miter);
346 return err;
347}
348
349static u16 cb710_encode_cmd_flags(struct cb710_mmc_reader *reader,
350 struct mmc_command *cmd)
351{
352 unsigned int flags = cmd->flags;
353 u16 cb_flags = 0;
354
355 /* Windows driver returned 0 for commands for which no response
356 * is expected. It happened that there were only two such commands
357 * used: MMC_GO_IDLE_STATE and MMC_GO_INACTIVE_STATE so it might
358 * as well be a bug in that driver.
359 *
360 * Original driver set bit 14 for MMC/SD application
361 * commands. There's no difference 'on the wire' and
362 * it apparently works without it anyway.
363 */
364
365 switch (flags & MMC_CMD_MASK) {
366 case MMC_CMD_AC: cb_flags = CB710_MMC_CMD_AC; break;
367 case MMC_CMD_ADTC: cb_flags = CB710_MMC_CMD_ADTC; break;
368 case MMC_CMD_BC: cb_flags = CB710_MMC_CMD_BC; break;
369 case MMC_CMD_BCR: cb_flags = CB710_MMC_CMD_BCR; break;
370 }
371
372 if (flags & MMC_RSP_BUSY)
373 cb_flags |= CB710_MMC_RSP_BUSY;
374
375 cb_flags |= cmd->opcode << CB710_MMC_CMD_CODE_SHIFT;
376
377 if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
378 cb_flags |= CB710_MMC_DATA_READ;
379
380 if (flags & MMC_RSP_PRESENT) {
381 /* Windows driver set 01 at bits 4,3 except for
382 * MMC_SET_BLOCKLEN where it set 10. Maybe the
383 * hardware can do something special about this
384 * command? The original driver looks buggy/incomplete
385 * anyway so we ignore this for now.
386 *
387 * I assume that 00 here means no response is expected.
388 */
389 cb_flags |= CB710_MMC_RSP_PRESENT;
390
391 if (flags & MMC_RSP_136)
392 cb_flags |= CB710_MMC_RSP_136;
393 if (!(flags & MMC_RSP_CRC))
394 cb_flags |= CB710_MMC_RSP_NO_CRC;
395 }
396
397 return cb_flags;
398}
399
400static void cb710_receive_response(struct cb710_slot *slot,
401 struct mmc_command *cmd)
402{
403 unsigned rsp_opcode, wanted_opcode;
404
405 /* Looks like final byte with CRC is always stripped (same as SDHCI) */
406 if (cmd->flags & MMC_RSP_136) {
407 u32 resp[4];
408
409 resp[0] = cb710_read_port_32(slot, CB710_MMC_RESPONSE3_PORT);
410 resp[1] = cb710_read_port_32(slot, CB710_MMC_RESPONSE2_PORT);
411 resp[2] = cb710_read_port_32(slot, CB710_MMC_RESPONSE1_PORT);
412 resp[3] = cb710_read_port_32(slot, CB710_MMC_RESPONSE0_PORT);
413 rsp_opcode = resp[0] >> 24;
414
415 cmd->resp[0] = (resp[0] << 8)|(resp[1] >> 24);
416 cmd->resp[1] = (resp[1] << 8)|(resp[2] >> 24);
417 cmd->resp[2] = (resp[2] << 8)|(resp[3] >> 24);
418 cmd->resp[3] = (resp[3] << 8);
419 } else {
420 rsp_opcode = cb710_read_port_32(slot, CB710_MMC_RESPONSE1_PORT) & 0x3F;
421 cmd->resp[0] = cb710_read_port_32(slot, CB710_MMC_RESPONSE0_PORT);
422 }
423
424 wanted_opcode = (cmd->flags & MMC_RSP_OPCODE) ? cmd->opcode : 0x3F;
425 if (rsp_opcode != wanted_opcode)
426 cmd->error = -EILSEQ;
427}
428
429static int cb710_mmc_transfer_data(struct cb710_slot *slot,
430 struct mmc_data *data)
431{
432 int error, to;
433
434 if (data->flags & MMC_DATA_READ)
435 error = cb710_mmc_receive(slot, data);
436 else
437 error = cb710_mmc_send(slot, data);
438
439 to = cb710_wait_for_event(slot, CB710_MMC_S1_DATA_TRANSFER_DONE);
440 if (!error)
441 error = to;
442
443 if (!error)
444 data->bytes_xfered = data->blksz * data->blocks;
445 return error;
446}
447
448static int cb710_mmc_command(struct mmc_host *mmc, struct mmc_command *cmd)
449{
450 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
451 struct cb710_mmc_reader *reader = mmc_priv(mmc);
452 struct mmc_data *data = cmd->data;
453
454 u16 cb_cmd = cb710_encode_cmd_flags(reader, cmd);
455 dev_dbg(cb710_slot_dev(slot), "cmd request: 0x%04X\n", cb_cmd);
456
457 if (data) {
458 if (!cb710_is_transfer_size_supported(data)) {
459 data->error = -EINVAL;
460 return -1;
461 }
462 cb710_mmc_set_transfer_size(slot, data->blocks, data->blksz);
463 }
464
465 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20|CB710_MMC_S2_BUSY_10);
466 cb710_write_port_16(slot, CB710_MMC_CMD_TYPE_PORT, cb_cmd);
467 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
468 cb710_write_port_32(slot, CB710_MMC_CMD_PARAM_PORT, cmd->arg);
469 cb710_mmc_reset_events(slot);
470 cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
471 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x01, 0);
472
473 cmd->error = cb710_wait_for_event(slot, CB710_MMC_S1_COMMAND_SENT);
474 if (cmd->error)
475 return -1;
476
477 if (cmd->flags & MMC_RSP_PRESENT) {
478 cb710_receive_response(slot, cmd);
479 if (cmd->error)
480 return -1;
481 }
482
483 if (data)
484 data->error = cb710_mmc_transfer_data(slot, data);
485 return 0;
486}
487
488static void cb710_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
489{
490 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
491 struct cb710_mmc_reader *reader = mmc_priv(mmc);
492
493 WARN_ON(reader->mrq != NULL);
494
495 reader->mrq = mrq;
496 cb710_mmc_enable_irq(slot, CB710_MMC_IE_TEST_MASK, 0);
497
498 if (cb710_mmc_is_card_inserted(slot)) {
499 if (!cb710_mmc_command(mmc, mrq->cmd) && mrq->stop)
500 cb710_mmc_command(mmc, mrq->stop);
501 mdelay(1);
502 } else {
503 mrq->cmd->error = -ENOMEDIUM;
504 }
505
506 tasklet_schedule(&reader->finish_req_tasklet);
507}
508
509static int cb710_mmc_powerup(struct cb710_slot *slot)
510{
511#ifdef CONFIG_CB710_DEBUG
512 struct cb710_chip *chip = cb710_slot_to_chip(slot);
513#endif
514 int err;
515
516 /* a lot of magic; see comment in cb710_mmc_set_clock() */
517 dev_dbg(cb710_slot_dev(slot), "bus powerup\n");
518 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
519 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
520 if (unlikely(err))
521 return err;
522 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x80, 0);
523 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0x80, 0);
524 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
525 mdelay(1);
526 dev_dbg(cb710_slot_dev(slot), "after delay 1\n");
527 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
528 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
529 if (unlikely(err))
530 return err;
531 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x09, 0);
532 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
533 mdelay(1);
534 dev_dbg(cb710_slot_dev(slot), "after delay 2\n");
535 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
536 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
537 if (unlikely(err))
538 return err;
539 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0, 0x08);
540 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
541 mdelay(2);
542 dev_dbg(cb710_slot_dev(slot), "after delay 3\n");
543 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
544 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x06, 0);
545 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0x70, 0);
546 cb710_modify_port_8(slot, CB710_MMC_CONFIG2_PORT, 0x80, 0);
547 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0x03, 0);
548 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
549 err = cb710_wait_while_busy(slot, CB710_MMC_S2_BUSY_20);
550 if (unlikely(err))
551 return err;
552 /* This port behaves weird: quick byte reads of 0x08,0x09 return
553 * 0xFF,0x00 after writing 0xFFFF to 0x08; it works correctly when
554 * read/written from userspace... What am I missing here?
555 * (it doesn't depend on write-to-read delay) */
556 cb710_write_port_16(slot, CB710_MMC_CONFIGB_PORT, 0xFFFF);
557 cb710_modify_port_8(slot, CB710_MMC_CONFIG0_PORT, 0x06, 0);
558 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
559 dev_dbg(cb710_slot_dev(slot), "bus powerup finished\n");
560
561 return cb710_check_event(slot, 0);
562}
563
564static void cb710_mmc_powerdown(struct cb710_slot *slot)
565{
566 cb710_modify_port_8(slot, CB710_MMC_CONFIG1_PORT, 0, 0x81);
567 cb710_modify_port_8(slot, CB710_MMC_CONFIG3_PORT, 0, 0x80);
568}
569
570static void cb710_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
571{
572 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
573 struct cb710_mmc_reader *reader = mmc_priv(mmc);
574 int err;
575
576 cb710_mmc_set_clock(mmc, ios->clock);
577
578 if (!cb710_mmc_is_card_inserted(slot)) {
579 dev_dbg(cb710_slot_dev(slot),
580 "no card inserted - ignoring bus powerup request\n");
581 ios->power_mode = MMC_POWER_OFF;
582 }
583
584 if (ios->power_mode != reader->last_power_mode)
585 switch (ios->power_mode) {
586 case MMC_POWER_ON:
587 err = cb710_mmc_powerup(slot);
588 if (err) {
589 dev_warn(cb710_slot_dev(slot),
590 "powerup failed (%d)- retrying\n", err);
591 cb710_mmc_powerdown(slot);
592 udelay(1);
593 err = cb710_mmc_powerup(slot);
594 if (err)
595 dev_warn(cb710_slot_dev(slot),
596 "powerup retry failed (%d) - expect errors\n",
597 err);
598 }
599 reader->last_power_mode = MMC_POWER_ON;
600 break;
601 case MMC_POWER_OFF:
602 cb710_mmc_powerdown(slot);
603 reader->last_power_mode = MMC_POWER_OFF;
604 break;
605 case MMC_POWER_UP:
606 default:
607 /* ignore */;
608 }
609
610 cb710_mmc_enable_4bit_data(slot, ios->bus_width != MMC_BUS_WIDTH_1);
611
612 cb710_mmc_enable_irq(slot, CB710_MMC_IE_TEST_MASK, 0);
613}
614
615static int cb710_mmc_get_ro(struct mmc_host *mmc)
616{
617 struct cb710_slot *slot = cb710_mmc_to_slot(mmc);
618
619 return cb710_read_port_8(slot, CB710_MMC_STATUS3_PORT)
620 & CB710_MMC_S3_WRITE_PROTECTED;
621}
622
623static int cb710_mmc_irq_handler(struct cb710_slot *slot)
624{
625 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
626 struct cb710_mmc_reader *reader = mmc_priv(mmc);
627 u32 status, config1, config2, irqen;
628
629 status = cb710_read_port_32(slot, CB710_MMC_STATUS_PORT);
630 irqen = cb710_read_port_32(slot, CB710_MMC_IRQ_ENABLE_PORT);
631 config2 = cb710_read_port_32(slot, CB710_MMC_CONFIGB_PORT);
632 config1 = cb710_read_port_32(slot, CB710_MMC_CONFIG_PORT);
633
634 dev_dbg(cb710_slot_dev(slot), "interrupt; status: %08X, "
635 "ie: %08X, c2: %08X, c1: %08X\n",
636 status, irqen, config2, config1);
637
638 if (status & (CB710_MMC_S1_CARD_CHANGED << 8)) {
639 /* ack the event */
640 cb710_write_port_8(slot, CB710_MMC_STATUS1_PORT,
641 CB710_MMC_S1_CARD_CHANGED);
642 if ((irqen & CB710_MMC_IE_CISTATUS_MASK)
643 == CB710_MMC_IE_CISTATUS_MASK)
644 mmc_detect_change(mmc, HZ/5);
645 } else {
646 dev_dbg(cb710_slot_dev(slot), "unknown interrupt (test)\n");
647 spin_lock(&reader->irq_lock);
648 __cb710_mmc_enable_irq(slot, 0, CB710_MMC_IE_TEST_MASK);
649 spin_unlock(&reader->irq_lock);
650 }
651
652 return 1;
653}
654
655static void cb710_mmc_finish_request_tasklet(unsigned long data)
656{
657 struct mmc_host *mmc = (void *)data;
658 struct cb710_mmc_reader *reader = mmc_priv(mmc);
659 struct mmc_request *mrq = reader->mrq;
660
661 reader->mrq = NULL;
662 mmc_request_done(mmc, mrq);
663}
664
665static const struct mmc_host_ops cb710_mmc_host = {
666 .request = cb710_mmc_request,
667 .set_ios = cb710_mmc_set_ios,
668 .get_ro = cb710_mmc_get_ro
669};
670
671#ifdef CONFIG_PM
672
673static int cb710_mmc_suspend(struct platform_device *pdev, pm_message_t state)
674{
675 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
676 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
677 int err;
678
679 err = mmc_suspend_host(mmc, state);
680 if (err)
681 return err;
682
683 cb710_mmc_enable_irq(slot, 0, ~0);
684 return 0;
685}
686
687static int cb710_mmc_resume(struct platform_device *pdev)
688{
689 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
690 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
691
692 cb710_mmc_enable_irq(slot, 0, ~0);
693
694 return mmc_resume_host(mmc);
695}
696
697#endif /* CONFIG_PM */
698
699static int __devinit cb710_mmc_init(struct platform_device *pdev)
700{
701 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
702 struct cb710_chip *chip = cb710_slot_to_chip(slot);
703 struct mmc_host *mmc;
704 struct cb710_mmc_reader *reader;
705 int err;
706 u32 val;
707
708 mmc = mmc_alloc_host(sizeof(*reader), cb710_slot_dev(slot));
709 if (!mmc)
710 return -ENOMEM;
711
712 dev_set_drvdata(&pdev->dev, mmc);
713
714 /* harmless (maybe) magic */
715 pci_read_config_dword(chip->pdev, 0x48, &val);
716 val = cb710_src_freq_mhz[(val >> 16) & 0xF];
717 dev_dbg(cb710_slot_dev(slot), "source frequency: %dMHz\n", val);
718 val *= 1000000;
719
720 mmc->ops = &cb710_mmc_host;
721 mmc->f_max = val;
722 mmc->f_min = val >> cb710_clock_divider_log2[CB710_MAX_DIVIDER_IDX];
723 mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
724 mmc->caps = MMC_CAP_4_BIT_DATA;
725
726 reader = mmc_priv(mmc);
727
728 tasklet_init(&reader->finish_req_tasklet,
729 cb710_mmc_finish_request_tasklet, (unsigned long)mmc);
730 spin_lock_init(&reader->irq_lock);
731 cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
732
733 cb710_mmc_enable_irq(slot, 0, ~0);
734 cb710_set_irq_handler(slot, cb710_mmc_irq_handler);
735
736 err = mmc_add_host(mmc);
737 if (unlikely(err))
738 goto err_free_mmc;
739
740 dev_dbg(cb710_slot_dev(slot), "mmc_hostname is %s\n",
741 mmc_hostname(mmc));
742
743 cb710_mmc_enable_irq(slot, CB710_MMC_IE_CARD_INSERTION_STATUS, 0);
744
745 return 0;
746
747err_free_mmc:
748 dev_dbg(cb710_slot_dev(slot), "mmc_add_host() failed: %d\n", err);
749
750 mmc_free_host(mmc);
751 return err;
752}
753
754static int __devexit cb710_mmc_exit(struct platform_device *pdev)
755{
756 struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
757 struct mmc_host *mmc = cb710_slot_to_mmc(slot);
758 struct cb710_mmc_reader *reader = mmc_priv(mmc);
759
760 cb710_mmc_enable_irq(slot, 0, CB710_MMC_IE_CARD_INSERTION_STATUS);
761
762 mmc_remove_host(mmc);
763
764 /* IRQs should be disabled now, but let's stay on the safe side */
765 cb710_mmc_enable_irq(slot, 0, ~0);
766 cb710_set_irq_handler(slot, NULL);
767
768 /* clear config ports - just in case */
769 cb710_write_port_32(slot, CB710_MMC_CONFIG_PORT, 0);
770 cb710_write_port_16(slot, CB710_MMC_CONFIGB_PORT, 0);
771
772 tasklet_kill(&reader->finish_req_tasklet);
773
774 mmc_free_host(mmc);
775 return 0;
776}
777
778static struct platform_driver cb710_mmc_driver = {
779 .driver.name = "cb710-mmc",
780 .probe = cb710_mmc_init,
781 .remove = __devexit_p(cb710_mmc_exit),
782#ifdef CONFIG_PM
783 .suspend = cb710_mmc_suspend,
784 .resume = cb710_mmc_resume,
785#endif
786};
787
788static int __init cb710_mmc_init_module(void)
789{
790 return platform_driver_register(&cb710_mmc_driver);
791}
792
793static void __exit cb710_mmc_cleanup_module(void)
794{
795 platform_driver_unregister(&cb710_mmc_driver);
796}
797
798module_init(cb710_mmc_init_module);
799module_exit(cb710_mmc_cleanup_module);
800
801MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
802MODULE_DESCRIPTION("ENE CB710 memory card reader driver - MMC/SD part");
803MODULE_LICENSE("GPL");
804MODULE_ALIAS("platform:cb710-mmc");
diff --git a/drivers/mmc/host/cb710-mmc.h b/drivers/mmc/host/cb710-mmc.h
new file mode 100644
index 000000000000..e845c776bdd7
--- /dev/null
+++ b/drivers/mmc/host/cb710-mmc.h
@@ -0,0 +1,104 @@
1/*
2 * cb710/cb710-mmc.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_MMC_H
11#define LINUX_CB710_MMC_H
12
13#include <linux/cb710.h>
14
15/* per-MMC-reader structure */
16struct cb710_mmc_reader {
17 struct tasklet_struct finish_req_tasklet;
18 struct mmc_request *mrq;
19 spinlock_t irq_lock;
20 unsigned char last_power_mode;
21};
22
23/* some device struct walking */
24
25static inline struct mmc_host *cb710_slot_to_mmc(struct cb710_slot *slot)
26{
27 return dev_get_drvdata(&slot->pdev.dev);
28}
29
30static inline struct cb710_slot *cb710_mmc_to_slot(struct mmc_host *mmc)
31{
32 struct platform_device *pdev = container_of(mmc_dev(mmc),
33 struct platform_device, dev);
34 return cb710_pdev_to_slot(pdev);
35}
36
37/* registers (this might be all wrong ;) */
38
39#define CB710_MMC_DATA_PORT 0x00
40
41#define CB710_MMC_CONFIG_PORT 0x04
42#define CB710_MMC_CONFIG0_PORT 0x04
43#define CB710_MMC_CONFIG1_PORT 0x05
44#define CB710_MMC_C1_4BIT_DATA_BUS 0x40
45#define CB710_MMC_CONFIG2_PORT 0x06
46#define CB710_MMC_C2_READ_PIO_SIZE_MASK 0x0F /* N-1 */
47#define CB710_MMC_CONFIG3_PORT 0x07
48
49#define CB710_MMC_CONFIGB_PORT 0x08
50
51#define CB710_MMC_IRQ_ENABLE_PORT 0x0C
52#define CB710_MMC_IE_TEST_MASK 0x00BF
53#define CB710_MMC_IE_CARD_INSERTION_STATUS 0x1000
54#define CB710_MMC_IE_IRQ_ENABLE 0x8000
55#define CB710_MMC_IE_CISTATUS_MASK \
56 (CB710_MMC_IE_CARD_INSERTION_STATUS|CB710_MMC_IE_IRQ_ENABLE)
57
58#define CB710_MMC_STATUS_PORT 0x10
59#define CB710_MMC_STATUS_ERROR_EVENTS 0x60FF
60#define CB710_MMC_STATUS0_PORT 0x10
61#define CB710_MMC_S0_FIFO_UNDERFLOW 0x40
62#define CB710_MMC_STATUS1_PORT 0x11
63#define CB710_MMC_S1_COMMAND_SENT 0x01
64#define CB710_MMC_S1_DATA_TRANSFER_DONE 0x02
65#define CB710_MMC_S1_PIO_TRANSFER_DONE 0x04
66#define CB710_MMC_S1_CARD_CHANGED 0x10
67#define CB710_MMC_S1_RESET 0x20
68#define CB710_MMC_STATUS2_PORT 0x12
69#define CB710_MMC_S2_FIFO_READY 0x01
70#define CB710_MMC_S2_FIFO_EMPTY 0x02
71#define CB710_MMC_S2_BUSY_10 0x10
72#define CB710_MMC_S2_BUSY_20 0x20
73#define CB710_MMC_STATUS3_PORT 0x13
74#define CB710_MMC_S3_CARD_DETECTED 0x02
75#define CB710_MMC_S3_WRITE_PROTECTED 0x04
76
77#define CB710_MMC_CMD_TYPE_PORT 0x14
78#define CB710_MMC_RSP_TYPE_MASK 0x0007
79#define CB710_MMC_RSP_R1 (0)
80#define CB710_MMC_RSP_136 (5)
81#define CB710_MMC_RSP_NO_CRC (2)
82#define CB710_MMC_RSP_PRESENT_MASK 0x0018
83#define CB710_MMC_RSP_NONE (0 << 3)
84#define CB710_MMC_RSP_PRESENT (1 << 3)
85#define CB710_MMC_RSP_PRESENT_X (2 << 3)
86#define CB710_MMC_CMD_TYPE_MASK 0x0060
87#define CB710_MMC_CMD_BC (0 << 5)
88#define CB710_MMC_CMD_BCR (1 << 5)
89#define CB710_MMC_CMD_AC (2 << 5)
90#define CB710_MMC_CMD_ADTC (3 << 5)
91#define CB710_MMC_DATA_READ 0x0080
92#define CB710_MMC_CMD_CODE_MASK 0x3F00
93#define CB710_MMC_CMD_CODE_SHIFT 8
94#define CB710_MMC_IS_APP_CMD 0x4000
95#define CB710_MMC_RSP_BUSY 0x8000
96
97#define CB710_MMC_CMD_PARAM_PORT 0x18
98#define CB710_MMC_TRANSFER_SIZE_PORT 0x1C
99#define CB710_MMC_RESPONSE0_PORT 0x20
100#define CB710_MMC_RESPONSE1_PORT 0x24
101#define CB710_MMC_RESPONSE2_PORT 0x28
102#define CB710_MMC_RESPONSE3_PORT 0x2C
103
104#endif /* LINUX_CB710_MMC_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-16 01:22:38 -0500