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Message-ID: <20080912234302.GA19230@rere.qmqm.pl>
Date: Sat, 13 Sep 2008 01:43:02 +0200
From: Michał Mirosław <mirq-linux@...e.qmqm.pl>
To: linux-kernel@...r.kernel.org
Cc: Pierre Ossman <drzeus-mmc@...eus.cx>, Alex Dubov <oakad@...oo.com>
Subject: RFC: Driver for CB710/720 memory card reader (MMC part)
Hello again,
Here is next version of CB710 MMC-host driver. Since I don't like
copying code I used platform device "bus" instead of duplicating
tifm_core and modifying it to cb710 specifics. Debugging printk()s
were retained for now.
Please comment,
Michał Mirosław
diff -urN empty/cb710.h cb710-pre-20080913/cb710.h
--- empty/cb710.h 1970-01-01 01:00:00.000000000 +0100
+++ cb710-pre-20080913/cb710.h 2008-09-13 00:30:51.000000000 +0200
@@ -0,0 +1,186 @@
+/*
+ * cb710/cb710.h
+ *
+ * Copyleft by Michał Mirosław, 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef LINUX_CB710_DRIVER_H
+#define LINUX_CB710_DRIVER_H
+
+#include <linux/spinlock.h>
+#include <linux/mmc/host.h>
+#include <linux/pci.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#define CB710_DRIVER_NAME "cb710"
+
+struct cb710_slot {
+ struct platform_device pdev;
+ int (*irq_handler)(struct cb710_slot *);
+};
+
+/* per-device structure */
+struct cb710_chip {
+ struct pci_dev *pdev;
+ void __iomem *iobase;
+
+ spinlock_t irq_lock;
+ unsigned irq_enabled;
+ unsigned platform_id;
+
+ unsigned slots;
+ struct cb710_slot slot[0];
+};
+
+#define CB710_SLOT_MASK 7
+#define CB710_SLOT_MMC 1
+#define CB710_SLOT_MS 2
+#define CB710_SLOT_SM 4
+#define CB710_SLOT_NR_SHIFT 8
+
+#define RDPORT(t, p) \
+ ioread##t(chip->iobase + (p))
+#define WRPORT(t, p, v) \
+ do { iowrite##t((v), chip->iobase + (p)); \
+ (void)ioread8(chip->iobase + 0x13); } while (0)
+#define UPDPORT(t, p, v, m) \
+ do { \
+ iowrite##t( \
+ (ioread##t(chip->iobase + (p)) & ~(m)) | (v), \
+ chip->iobase + (p)); \
+ (void)ioread8(chip->iobase + 0x13); \
+ } while (0)
+#define S_RDPORT(t, p, b, c) \
+ ioread##t##_rep(chip->iobase + (p), (b), (c))
+#define S_WRPORT(t, p, b, c) \
+ do { \
+ iowrite##t##_rep(chip->iobase + (p), (b), (c)); \
+ (void)ioread8(chip->iobase + 0x13); \
+ } while (0)
+
+
+void __cb710_pci_update_config_reg(struct pci_dev *pdev,
+ int reg, uint32_t mask, uint32_t xor);
+#define cb710_pci_update_config_reg(d, r, m, x) \
+ __cb710_pci_update_config_reg((d), (r), ~(m), (x))
+
+/* sg-to-PIO buffer */
+#define CB710_SG_BUFFER_BLOCK 16 /* power of two */
+struct cb710_sg_chain {
+ uint8_t bounce_buffer[CB710_SG_BUFFER_BLOCK];
+ struct scatterlist *sg;
+ unsigned int sg_num;
+ struct page *page;
+ void *mapped_page;
+ size_t cur_offset;
+ size_t need_advance;
+ unsigned page_no;
+ unsigned page_offset;
+ unsigned page_left;
+ unsigned need_bounce:1;
+ unsigned use_bounce:1;
+};
+
+void cb710_sg_init(struct cb710_sg_chain *buf,
+ struct scatterlist *sg, size_t nelem);
+int cb710_sg_next_buf(struct cb710_sg_chain *buf,
+ void **dataptr, size_t *len, int to_sg);
+void cb710_sg_abort(struct cb710_sg_chain *buf, int to_sg);
+
+#define cb710_sg_read_next(b, d, l) \
+ cb710_sg_next_buf((b), (d), (l), 0)
+#define cb710_sg_write_next(b, d, l) \
+ cb710_sg_next_buf((b), (d), (l), 1)
+#define cb710_sg_abort_read(b) \
+ cb710_sg_abort((b), 0)
+#define cb710_sg_abort_write(b) \
+ cb710_sg_abort((b), 1)
+
+/* per-MMC-reader structure */
+struct cb710_mmc_reader {
+ struct tasklet_struct finish_req_tasklet;
+ struct mmc_request *mrq;
+ unsigned char last_power_mode;
+ unsigned char app_cmd;
+ spinlock_t serialization_lock;
+ unsigned char active_req, active_ios;
+};
+
+/* some device struct walking */
+
+static inline struct cb710_chip *cb710_slot_to_chip(struct cb710_slot *slot)
+{
+ return dev_get_drvdata(slot->pdev.dev.parent);
+}
+
+static inline struct cb710_chip *cb710_mmc_to_chip(struct mmc_host *mmc)
+{
+ return dev_get_drvdata(mmc_dev(mmc));
+}
+
+static inline struct mmc_host *cb710_slot_to_mmc(struct cb710_slot *slot)
+{
+ return dev_get_drvdata(&slot->pdev.dev);
+}
+
+
+/* registers */
+
+#define CB710_MMC_DATA_PORT 0x00
+#define CB710_MMC_CONFIG_PORT 0x04
+#define CB710_MMC_CONFIG0_PORT 0x04
+#define CB710_MMC_CONFIG1_PORT 0x05
+#define CB710_MMC_C1_4BIT_DATA_BUS 0x40
+#define CB710_MMC_CONFIG2_PORT 0x06
+#define CB710_MMC_C2_READ_BLOCK_SIZE_MASK 0x0F /* N-1 */
+#define CB710_MMC_CONFIG3_PORT 0x07
+#define CB710_MMC_INTERRUPT_ENABLE_PORT 0x0D
+#define CB710_MMC_IE_IRQ_ENABLE 0x80
+#define CB710_MMC_IE_CARD_INSERTION_STATUS 0x10
+#define CB710_MMC_STATUS_PORT 0x10
+#define CB710_MMC_STATUS0_PORT 0x10
+#define CB710_MMC_STATUS1_PORT 0x11
+#define CB710_MMC_S1_CARD_CHANGED 0x10
+#define CB710_MMC_S1_RESET 0x20 /* XXX really? */
+#define CB710_MMC_STATUS2_PORT 0x12
+#define CB710_MMC_STATUS3_PORT 0x13
+#define CB710_MMC_S3_CARD_DETECTED 0x02
+#define CB710_MMC_S3_WRITE_PROTECTED 0x04
+#define CB710_MMC_CMD_TYPE_PORT 0x14
+#define CB710_MMC_RSP_TYPE_MASK 0x0007
+#define CB710_MMC_RSP_R1 (0)
+#define CB710_MMC_RSP_136 (5)
+#define CB710_MMC_RSP_NO_CRC (2)
+#define CB710_MMC_RSP_PRESENT_MASK 0x0018
+#define CB710_MMC_RSP_NONE (0 << 3)
+#define CB710_MMC_RSP_PRESENT (1 << 3)
+#define CB710_MMC_RSP_PRESENT_X (2 << 3)
+#define CB710_MMC_CMD_TYPE_MASK 0x0060
+#define CB710_MMC_CMD_BC (0 << 5)
+#define CB710_MMC_CMD_BCR (1 << 5)
+#define CB710_MMC_CMD_AC (2 << 5)
+#define CB710_MMC_CMD_ADTC (3 << 5)
+#define CB710_MMC_DATA_READ 0x0080
+#define CB710_MMC_CMD_CODE_MASK 0x3F00
+#define CB710_MMC_CMD_CODE_SHIFT 8
+#define CB710_MMC_IS_APP_CMD 0x4000
+#define CB710_MMC_RSP_BUSY 0x8000
+#define CB710_MMC_CMD_PARAM_PORT 0x18
+#define CB710_MMC_TRANSFER_SIZE_PORT 0x1C
+#define CB710_MMC_RESPONSE0_PORT 0x20
+#define CB710_MMC_RESPONSE1_PORT 0x24
+#define CB710_MMC_RESPONSE2_PORT 0x28
+#define CB710_MMC_RESPONSE3_PORT 0x2C
+
+void cb710_dump_regs(struct cb710_chip *chip, unsigned dump);
+#define CB710_DUMP_REGS_MMC 0x0F
+#define CB710_DUMP_REGS_MS 0x30
+#define CB710_DUMP_REGS_SM 0xC0
+#define CB710_DUMP_REGS_ALL 0xFF
+
+#endif /* LINUX_CB710_DRIVER_H */
diff -urN empty/core.c cb710-pre-20080913/core.c
--- empty/core.c 1970-01-01 01:00:00.000000000 +0100
+++ cb710-pre-20080913/core.c 2008-09-13 01:34:03.000000000 +0200
@@ -0,0 +1,342 @@
+/*
+ * cb710/core.c
+ *
+ * Copyleft by Michał Mirosław, 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/idr.h>
+#include "cb710.h"
+
+static DEFINE_IDR(cb710_idr);
+static DEFINE_SPINLOCK(cb710_idr_lock);
+
+void __cb710_pci_update_config_reg(struct pci_dev *pdev,
+ int reg, uint32_t mask, uint32_t xor)
+{
+ u32 rval;
+
+ pci_read_config_dword(pdev, reg, &rval);
+ rval = (rval & mask) ^ xor;
+ pci_write_config_dword(pdev, reg, rval);
+}
+EXPORT_SYMBOL(__cb710_pci_update_config_reg);
+
+void cb710_dump_regs(struct cb710_chip *chip, unsigned select)
+{
+ const unsigned allow[8] = {
+ 0xFFF0, 0xFFFF, 0xFFFF, 0xFFFF,
+ 0xFFF0, 0xFFFF, 0xFFFF, 0xFFFF,
+ };
+ const char *const prefix[sizeof(allow)/sizeof(*allow)] = {
+ "MMC", "MMC", "MMC", "MMC",
+ "MS?", "MS?", "SM?", "SM?"
+ };
+ u32 regs[sizeof(allow)/sizeof(*allow) << 2];
+
+ int i, j;
+ char msg[100], *p;
+
+ if (!select)
+ select = 0xFF;
+ if (!(select & 0x700))
+ select |= 0x100;
+
+#define reg(b, i) \
+ (((u##b*)regs)[(i) / (b/8)])
+#define allowed(b, i, j) \
+ (((allow[i >> 4] >> j) & ((1 << b/8)-1)) == ((1 << b/8)-1))
+#define dumpregs(b, f, x) { \
+ for (i = 0; i < (sizeof(allow)/sizeof(*allow) << 4); i += 0x10) { \
+ if (!(select & (1 << (i >> 4)))) \
+ continue; \
+ for (j = 0; j < 0x10; j += b/8) { \
+ if (allowed(b, i, j)) \
+ reg(b, i + j) = RDPORT(b, i + j); \
+ }; \
+ } \
+ for (i = 0; i < (sizeof(allow)/sizeof(*allow) << 4); i += 0x10) { \
+ if (!(select & (1 << (i >> 4)))) \
+ continue; \
+ p = msg; \
+ for (j = 0; j < 0x10; j += b/8) { \
+ if (allowed(b, i, j)) \
+ p += sprintf(p, " %s" f, (j == 8 ? " " : ""), \
+ reg(b, i + j)); \
+ else \
+ p += sprintf(p, " %s" x, (j == 8 ? " " : "")); \
+ udelay(1); \
+ } \
+ \
+ printk(KERN_INFO CB710_DRIVER_NAME ": %s 0x%02X %s\n", \
+ prefix[i >> 4], i, msg); \
+ } \
+ }
+
+ if (select & 0x400)
+ dumpregs(32, "%08X", "xxxxxxxx");
+ if (select & 0x200)
+ dumpregs(16, "%04X", "xxxx");
+ if (select & 0x100)
+ dumpregs( 8, "%02X", "xx");
+
+#undef dumpregs
+#undef allowed
+#undef reg
+}
+EXPORT_SYMBOL(cb710_dump_regs);
+
+/* Some magic writes based on Windows driver init code */
+static int __devinit cb710_pci_configure(struct pci_dev *pdev)
+{
+ unsigned int devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
+ struct pci_dev *pdev0 = pci_get_slot(pdev->bus, devfn);
+ u32 val;
+
+ cb710_pci_update_config_reg(pdev, 0x48, 0xC0, 0x3F);
+
+ pci_read_config_dword(pdev, 0x48, &val);
+ if (val & 0x80000000)
+ return 0;
+
+ if (!pdev0)
+ return -ENODEV;
+
+ if (pdev0->vendor == PCI_VENDOR_ID_ENE
+ && pdev0->device == PCI_DEVICE_ID_ENE_720) {
+ cb710_pci_update_config_reg(pdev0, 0x8C, 0xE00000, 0x100000);
+ cb710_pci_update_config_reg(pdev0, 0xB0, 0, 0x08000000);
+ }
+
+ cb710_pci_update_config_reg(pdev0, 0x8C, 0x0D00, 0x0200);
+ cb710_pci_update_config_reg(pdev0, 0x90, 0x020000, 0x040000);
+
+ pci_dev_put(pdev0);
+
+ return 0;
+}
+
+static irqreturn_t cb710_irq_handler(int irq, void *data)
+{
+ struct cb710_chip *chip = data;
+ irqreturn_t handled = IRQ_NONE;
+ unsigned flags;
+ int nr;
+
+ spin_lock_irqsave(&chip->irq_lock, flags);
+
+ nr = chip->slots >> CB710_SLOT_NR_SHIFT;
+ while (nr--) {
+ struct cb710_slot *slot = &chip->slot[nr];
+ if (slot->irq_handler && slot->irq_handler(slot))
+ handled = IRQ_HANDLED;
+ }
+
+ spin_unlock_irqrestore(&chip->irq_lock, flags);
+
+ return handled;
+}
+
+static int __devinit cb710_register_slot(struct cb710_chip *chip,
+ unsigned slot_mask, unsigned io_offset, const char *name)
+{
+ int nr = chip->slots >> CB710_SLOT_NR_SHIFT;
+ struct cb710_slot *slot = &chip->slot[nr];
+ unsigned long flags;
+ int err;
+
+ slot->pdev.dev.parent = &chip->pdev->dev;
+ slot->pdev.name = name;
+ slot->pdev.id = chip->platform_id;
+ err = platform_device_register(&slot->pdev);
+
+ printk(KERN_INFO CB710_DRIVER_NAME ": register: %s.%d; slot %d\n",
+ name, chip->platform_id, slot_mask);
+ if (err)
+ return err;
+
+ spin_lock_irqsave(&chip->irq_lock, flags);
+
+ chip->slots = ((nr + 1) << CB710_SLOT_NR_SHIFT)
+ |(chip->slots & CB710_SLOT_MASK)|slot_mask;
+
+ spin_unlock_irqrestore(&chip->irq_lock, flags);
+
+ return 0;
+}
+
+static void cb710_unregister_slot(struct cb710_chip *chip,
+ unsigned slot)
+{
+ unsigned long flags;
+ int nr;
+
+ if (!(chip->slots & slot))
+ return;
+
+ spin_lock_irqsave(&chip->irq_lock, flags);
+
+ nr = (chip->slots >> CB710_SLOT_NR_SHIFT) - 1;
+ chip->slots = (nr << CB710_SLOT_NR_SHIFT)
+ |(chip->slots & CB710_SLOT_MASK & ~slot);
+
+ spin_unlock_irqrestore(&chip->irq_lock, flags);
+
+ platform_device_unregister(&chip->slot[nr].pdev);
+}
+
+static int __devinit cb710_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ struct cb710_chip *chip;
+ unsigned long flags;
+ u32 val;
+ int err;
+ int n = 0;
+
+ err = cb710_pci_configure(pdev);
+ if (err)
+ return err;
+
+ pci_read_config_dword(pdev, 0x48, &val);
+ if (!(val & 0x80000000)) {
+ pci_write_config_dword(pdev, 0x48, val|0x71000000);
+ pci_read_config_dword(pdev, 0x48, &val);
+ }
+
+ printk(KERN_INFO CB710_DRIVER_NAME
+ ": PCI config[0x48] = 0x%08X (%d %d %d %d %d %d)\n",
+ val,
+ !(val & 0x01000000),
+ (val >> 8) & 7,
+ !!(val & 0x10000000),
+ !!(val & 0x20000000),
+ !!(val & 0x40000000),
+ !(val & 0x02000000)
+ );
+
+ if (!(val & 0x70000000))
+ return -ENODEV;
+ val = (val >> 28) & 7;
+ if (val & CB710_SLOT_MMC)
+ ++n;
+ if (val & CB710_SLOT_MS)
+ ++n;
+ if (val & CB710_SLOT_SM)
+ ++n;
+
+ chip = devm_kzalloc(&pdev->dev,
+ sizeof(*chip) + n * sizeof(*chip->slot), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ err = pcim_enable_device(pdev);
+ if (err)
+ return err;
+
+ err = pcim_iomap_regions(pdev, 0x0001, CB710_DRIVER_NAME);
+ if (err)
+ return err;
+
+ spin_lock_init(&chip->irq_lock);
+ chip->pdev = pdev;
+ chip->iobase = pcim_iomap_table(pdev)[0];
+
+ pci_set_drvdata(pdev, chip);
+
+ err = devm_request_irq(&pdev->dev, pdev->irq,
+ cb710_irq_handler, IRQF_SHARED, "cb710", chip);
+ if (err)
+ return err;
+
+ if (!idr_pre_get(&cb710_idr, GFP_KERNEL))
+ return -ENOMEM;
+
+ spin_lock_irqsave(&cb710_idr_lock, flags);
+ err = idr_get_new(&cb710_idr, chip, &chip->platform_id);
+ spin_unlock_irqrestore(&cb710_idr_lock, flags);
+ if (err)
+ return err;
+
+ dev_printk(KERN_INFO CB710_DRIVER_NAME ": ", &pdev->dev,
+ "id %d, IO 0x%p, IRQ %d\n",
+ chip->platform_id, chip->iobase, pdev->irq);
+
+ if (val & CB710_SLOT_MMC) { /* MMC/SD slot */
+ err = cb710_register_slot(chip,
+ CB710_SLOT_MMC, 0x00, "cb710-mmc");
+ if (err)
+ return err;
+ }
+
+ if (val & CB710_SLOT_MS) { /* MemoryStick slot */
+ err = cb710_register_slot(chip,
+ CB710_SLOT_MS, 0x40, "cb710-ms");
+ if (err)
+ goto unreg_mmc;
+ }
+
+ if (val & CB710_SLOT_SM) { /* SmartMedia slot */
+ err = cb710_register_slot(chip,
+ CB710_SLOT_SM, 0x60, "cb710-sm");
+ if (err)
+ goto unreg_ms;
+ }
+
+ return 0;
+unreg_ms:
+ cb710_unregister_slot(chip, CB710_SLOT_MS);
+unreg_mmc:
+ cb710_unregister_slot(chip, CB710_SLOT_MMC);
+ return err;
+}
+
+static void __devexit cb710_remove_one(struct pci_dev *pdev)
+{
+ struct cb710_chip *chip = pci_get_drvdata(pdev);
+ unsigned long flags;
+
+ cb710_unregister_slot(chip, CB710_SLOT_SM);
+ cb710_unregister_slot(chip, CB710_SLOT_MS);
+ cb710_unregister_slot(chip, CB710_SLOT_MMC);
+
+ spin_lock_irqsave(&cb710_idr_lock, flags);
+ idr_remove(&cb710_idr, chip->platform_id);
+ spin_unlock_irqrestore(&cb710_idr_lock, flags);
+}
+
+static const struct pci_device_id cb710_pci_tbl[] = {
+ { PCI_VENDOR_ID_ENE, 0x510, PCI_ANY_ID, PCI_ANY_ID, },
+ { 0, }
+};
+
+static struct pci_driver cb710_driver = {
+ .name = "cb710",
+ .id_table = cb710_pci_tbl,
+ .probe = cb710_probe,
+ .remove = __devexit_p(cb710_remove_one),
+};
+
+static int __init cb710_init_module(void)
+{
+ return pci_register_driver(&cb710_driver);
+}
+
+static void __exit cb710_cleanup_module(void)
+{
+ pci_unregister_driver(&cb710_driver);
+}
+
+module_init(cb710_init_module);
+module_exit(cb710_cleanup_module);
+
+MODULE_AUTHOR("Michał Mirosław <mirq-linux@...e.qmqm.pl>");
+MODULE_DESCRIPTION("ENE CB710 memory card reader driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, cb710_pci_tbl);
diff -urN empty/Makefile cb710-pre-20080913/Makefile
--- empty/Makefile 1970-01-01 01:00:00.000000000 +0100
+++ cb710-pre-20080913/Makefile 2008-09-12 20:56:39.000000000 +0200
@@ -0,0 +1,24 @@
+ifeq ($(KERNELRELEASE),)
+
+#KDIR := /usr/src/linux
+KDIR := /usr/src/jaja/build/rechot
+PWD := $(shell pwd)
+
+.PHONY: module install clean
+module:
+ $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
+
+install:
+ $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules_install
+
+clean:
+ $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) clean
+
+else # kbuild part
+
+obj-m := cb710-core.o cb710-mmc.o
+
+cb710-core-y := core.o sgbuf.o
+cb710-mmc-y := mmc.o
+
+endif
diff -urN empty/mmc.c cb710-pre-20080913/mmc.c
--- empty/mmc.c 1970-01-01 01:00:00.000000000 +0100
+++ cb710-pre-20080913/mmc.c 2008-09-13 01:28:10.000000000 +0200
@@ -0,0 +1,746 @@
+/*
+ * cb710/mmc.c
+ *
+ * Copyleft by Michał Mirosław, 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/mmc/mmc.h>
+#include "cb710.h"
+
+static const u8 cb710_clock_divider_log2[8] = {
+/* 1, 2, 4, 8, 16, 32, 128, 512 */
+ 0, 1, 2, 3, 4, 5, 7, 9
+};
+#define CB710_MMC_MAX_DIVIDER_LOG2 9
+
+static const u8 cb710_src_freq_mhz[16] = {
+ 33, 10, 20, 25, 30, 35, 40, 45,
+ 50, 55, 60, 65, 70, 75, 80, 85
+};
+
+static void verify_serialization(struct cb710_mmc_reader *reader,
+ unsigned char *counter, int inc)
+{
+ unsigned long flags;
+ int req, ios, cur;
+
+ spin_lock_irqsave(&reader->serialization_lock, flags);
+
+ if (inc)
+ cur = ++*counter;
+ else
+ cur = --*counter;
+ req = reader->active_req;
+ ios = reader->active_ios;
+
+ spin_unlock_irqrestore(&reader->serialization_lock, flags);
+
+ printk(KERN_INFO CB710_DRIVER_NAME ": %s driver;"
+ "counters now: ios=%d req=%d\n",
+ inc ? "entering" : "leaving", ios, req);
+ WARN_ON(cur > 1);
+}
+
+static void cb710_mmc_set_clock(struct mmc_host *mmc, int hz)
+{
+ struct cb710_chip *chip = cb710_mmc_to_chip(mmc);
+ struct pci_dev *pdev = chip->pdev;
+ u32 src_freq_idx;
+ u32 divider_idx;
+ int src_hz;
+
+ /* this is magic, unverifiable for me, unless I get
+ * MMC card with cables connected to bus signals */
+ pci_read_config_dword(pdev, 0x48, &src_freq_idx);
+ src_freq_idx = (src_freq_idx >> 16) & 0xF;
+ src_hz = cb710_src_freq_mhz[src_freq_idx] * 1000000;
+
+ for (divider_idx = 0; divider_idx < 8; ++divider_idx) {
+ if (hz >= src_hz >> cb710_clock_divider_log2[divider_idx])
+ break;
+ }
+ if (divider_idx == 8)
+ --divider_idx;
+
+ if (src_freq_idx)
+ divider_idx |= 0x8;
+
+ cb710_pci_update_config_reg(pdev, 0x40, 0xF0000000, divider_idx << 28);
+
+ printk(KERN_INFO CB710_DRIVER_NAME
+ ": %s: clock set to %d Hz, wanted %d Hz; flag = %d\n",
+ mmc_hostname(mmc),
+ src_hz >> cb710_clock_divider_log2[divider_idx & 7],
+ hz, (divider_idx & 8) != 0);
+}
+
+static void __cb710_mmc_enable_irq(struct cb710_chip *chip, int enable)
+{
+ if (enable) {
+ chip->irq_enabled |= 0x01;
+ /* look like interrupt is fired whenever
+ * WORD[0x0C] & WORD[0x10] != 0;
+ * let's verify it...
+ *** bit 7 port 0x0D seems to be global interrupt enable
+ */
+ WRPORT(8, 0x0C, ~0x40);
+ WRPORT(8, 0x0D, 0x90);
+ } else {
+ chip->irq_enabled &= ~0x01;
+ WRPORT(8, 0x0C, 0);
+ WRPORT(8, 0x0D, 0);
+ }
+}
+
+static void cb710_mmc_enable_irq(struct cb710_chip *chip, int enable)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->irq_lock, flags);
+ __cb710_mmc_enable_irq(chip, enable);
+ spin_unlock_irqrestore(&chip->irq_lock, flags);
+}
+
+static int cb710_mmc_is_card_inserted(struct cb710_chip *chip)
+{
+ return RDPORT(8, CB710_MMC_STATUS3_PORT)
+ & CB710_MMC_S3_CARD_DETECTED;
+}
+
+static void cb710_mmc_enable_4bit_data(struct cb710_chip *chip, int enable)
+{
+ printk(KERN_INFO CB710_DRIVER_NAME
+ ": configuring %d-data-line%s mode\n",
+ enable ? 4 : 1, enable ? "s" : "");
+ UPDPORT(8, CB710_MMC_CONFIG1_PORT,
+ enable ? CB710_MMC_C1_4BIT_DATA_BUS : 0,
+ CB710_MMC_C1_4BIT_DATA_BUS);
+}
+
+static int cb710_check(struct cb710_chip *chip, int what)
+{
+ uint8_t status1, status2;
+
+ /* all this is magic */
+ BUG_ON(what < 2 || what > 4);
+
+ status1 = RDPORT(8, CB710_MMC_STATUS0_PORT);
+ status2 = RDPORT(8, CB710_MMC_STATUS1_PORT);
+
+ if (status1 & 0x40) {
+ printk(KERN_INFO CB710_DRIVER_NAME
+ ": CHECK : ignoring bit S0=%02X & 0x40\n",
+ status1);
+ WRPORT(8, CB710_MMC_STATUS0_PORT, 0x40);
+ status1 &= ~0x40;
+ }
+
+ if (status1 || (status2 & 0x60)) {
+ printk(KERN_INFO CB710_DRIVER_NAME
+ ": CHECK : returning EIO on status S0=%02X S1=%02X\n",
+ status1, status2);
+ WRPORT(8, CB710_MMC_STATUS0_PORT, status1);
+ WRPORT(8, CB710_MMC_STATUS1_PORT, 0x20);
+ return -EIO;
+ }
+
+ switch (what) {
+ case 2: /* block transfer done */
+ if (!(status2 & 0x04))
+ break;
+ WRPORT(8, CB710_MMC_STATUS1_PORT, 0x04);
+ return 1;
+ case 3: /* command sent */
+ if (!(status2 & 0x01))
+ break;
+ WRPORT(8, CB710_MMC_STATUS1_PORT, 0x01);
+ return 1;
+ case 4: /* data transfer done */
+ if (!(status2 & 0x02))
+ break;
+ WRPORT(8, CB710_MMC_STATUS1_PORT, 0x02);
+ return 1;
+ }
+ return 0;
+}
+
+static int cb710_wait(struct cb710_chip *chip, int what)
+{
+ int err = 0;
+ unsigned limit = 2000000; /* FIXME: real timeout */
+ u32 e = 0, x = 0;
+
+ e = RDPORT(32, CB710_MMC_STATUS_PORT);
+ while (!(err = cb710_check(chip, what))) {
+ if (!--limit) {
+ err = -ETIMEDOUT;
+ break;
+ }
+ udelay(1);
+ }
+ x = RDPORT(32, CB710_MMC_STATUS_PORT);
+#if 0
+ printk(KERN_INFO CB710_DRIVER_NAME ": waited %d loops, "
+ "WAIT10: what %d, entry val %08X, exit val %08X\n",
+ 2000000 - limit, what, e, x);
+#endif
+ return err < 0 ? err : 0;
+}
+
+
+static int cb710_wait12(struct cb710_chip *chip, uint8_t mask)
+{
+ unsigned limit = 500000; /* FIXME: real timeout */
+ u32 e, x;
+ int err = 0;
+
+ e = RDPORT(32, CB710_MMC_STATUS_PORT);
+ while (RDPORT(8, CB710_MMC_STATUS2_PORT) & mask) {
+ if (!--limit) {
+ err = -ETIMEDOUT;
+ break;
+ }
+ udelay(1);
+ }
+ x = RDPORT(32, CB710_MMC_STATUS_PORT);
+#if 0
+ printk(KERN_INFO CB710_DRIVER_NAME ": waited %d loops, "
+ "WAIT12: mask %02X, entry val %08X, exit val %08X\n",
+ 500000 - limit, mask, e, x);
+#endif
+ return 0;
+}
+
+static void cb710_mmc_set_transfer_size(struct cb710_chip *chip,
+ size_t count, size_t blocksize)
+{
+ cb710_wait12(chip, 0x20);
+ WRPORT(32, CB710_MMC_TRANSFER_SIZE_PORT,
+ ((count - 1) << 16)|(blocksize - 1));
+
+ printk(KERN_INFO CB710_DRIVER_NAME
+ ": set up for %d block%s of %d bytes\n",
+ count, count == 1 ? "" : "s", blocksize);
+}
+
+static void cb710_mmc_fifo_hack(struct cb710_chip *chip)
+{
+ /* without this, received data is prepended with 8-bytes of zeroes */
+ u32 r1, r2;
+ int ok = 0;
+
+ r1 = RDPORT(32, CB710_MMC_DATA_PORT);
+ r2 = RDPORT(32, CB710_MMC_DATA_PORT);
+ if (RDPORT(8, CB710_MMC_STATUS0_PORT) & 0x40) {
+ WRPORT(8, CB710_MMC_STATUS0_PORT, 0x40);
+ ok = 1;
+ }
+
+ printk(KERN_INFO CB710_DRIVER_NAME ": FIFO-read-hack: "
+ "expected STATUS0 bit was %s dwords ignored: %08X %08X\n",
+ ok ? "set." : "NOT SET!", r1, r2);
+}
+
+static int cb710_mmc_receive(struct cb710_chip *chip, struct mmc_data *data)
+{
+ struct cb710_sg_chain sgc;
+ uint32_t *databuf;
+ size_t len;
+
+ cb710_sg_init(&sgc, data->sg, data->sg_len);
+
+ if (!cb710_sg_write_next(&sgc, (void **)&databuf, &len))
+ return 0;
+
+ UPDPORT(8, CB710_MMC_CONFIG2_PORT,
+ 15, CB710_MMC_C2_READ_BLOCK_SIZE_MASK);
+
+ cb710_mmc_fifo_hack(chip);
+
+ while (len >= 16) {
+ if (!(RDPORT(8, CB710_MMC_STATUS2_PORT) & 0x01)) {
+ int err = cb710_wait(chip, 2);
+ if (err) {
+ cb710_sg_abort_write(&sgc);
+ return err;
+ }
+ }
+ S_RDPORT(32, CB710_MMC_DATA_PORT, databuf, 4);
+
+ len -= 16;
+ databuf += 4;
+
+ if (!len && !cb710_sg_write_next(&sgc,
+ (void **)&databuf, &len))
+ return 0;
+ }
+
+ UPDPORT(8, CB710_MMC_CONFIG2_PORT,
+ len - 1, CB710_MMC_C2_READ_BLOCK_SIZE_MASK);
+
+ if (RDPORT(8, CB710_MMC_STATUS2_PORT) & 0x01) {
+ int err = cb710_wait(chip, 2);
+ if (err) {
+ cb710_sg_abort_write(&sgc);
+ return err;
+ }
+ }
+
+ len = (len + 3) >> 2;
+ S_RDPORT(32, CB710_MMC_DATA_PORT, databuf, len);
+
+ if (cb710_sg_write_next(&sgc, (void **)&databuf, &len))
+ BUG();
+
+ return 0;
+}
+
+static int cb710_mmc_send(struct cb710_chip *chip, struct mmc_data *data)
+{
+ struct cb710_sg_chain sgc;
+ const uint32_t *databuf;
+ size_t datalen;
+
+ cb710_sg_init(&sgc, data->sg, data->sg_len);
+
+ UPDPORT(8, CB710_MMC_CONFIG2_PORT,
+ 0, CB710_MMC_C2_READ_BLOCK_SIZE_MASK);
+
+ while (cb710_sg_read_next(&sgc, (void **)&databuf, &datalen)) {
+ datalen = (datalen + 15) >> 4;
+ do {
+ if (!(RDPORT(8, CB710_MMC_STATUS2_PORT) & 0x02)) {
+ int err = cb710_wait(chip, 2);
+ if (err) {
+ cb710_sg_abort_read(&sgc);
+ return err;
+ }
+ }
+ S_WRPORT(32, CB710_MMC_DATA_PORT, databuf, 4);
+ databuf += 4;
+ } while (--datalen);
+ }
+
+ return 0;
+}
+
+static u16 cb710_encode_cmd_flags(struct cb710_mmc_reader *reader,
+ struct mmc_command *cmd)
+{
+ unsigned int flags = cmd->flags;
+ u16 cb_flags = 0;
+
+ /* Windows driver returned 0 for commands for which no response
+ * was expected. It happened that there were only two such commands
+ * used: MMC_GO_IDLE_STATE and MMC_GO_INACTIVE_STATE so it might
+ * as well be a bug in that driver.
+ */
+
+ switch (flags & MMC_CMD_MASK) {
+ case MMC_CMD_AC: cb_flags = CB710_MMC_CMD_AC; break;
+ case MMC_CMD_ADTC: cb_flags = CB710_MMC_CMD_ADTC; break;
+ case MMC_CMD_BC: cb_flags = CB710_MMC_CMD_BC; break;
+ case MMC_CMD_BCR: cb_flags = CB710_MMC_CMD_BCR; break;
+ }
+
+ if (flags & MMC_RSP_BUSY)
+ cb_flags |= CB710_MMC_RSP_BUSY;
+
+ cb_flags |= cmd->opcode << CB710_MMC_CMD_CODE_SHIFT;
+
+/* if (flags & MMC_CMD_IS_APP) */
+ if (reader->app_cmd) {
+ /* original driver set this bit for MMC/SD application
+ * commands. It apparently works without it, but... oh well.
+ */
+ cb_flags |= 0x4000;
+ reader->app_cmd = 0;
+ }
+
+ if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
+ cb_flags |= CB710_MMC_DATA_READ;
+
+ if (flags & MMC_RSP_PRESENT) {
+ /* Windows driver set 01 at bits 4,3 except for
+ * MMC_SET_BLOCKLEN. I assume that 00 here means no
+ * response is expected.
+ */
+ if (cmd->opcode != MMC_SET_BLOCKLEN)
+ cb_flags |= CB710_MMC_RSP_PRESENT;
+ else
+ cb_flags |= CB710_MMC_RSP_PRESENT_X;
+
+ if (flags & MMC_RSP_136) /* R2 */
+ cb_flags |= CB710_MMC_RSP_136;
+ else if (!(flags & MMC_RSP_CRC)) /* R3 */
+ cb_flags |= CB710_MMC_RSP_NO_CRC;
+ }
+
+ return cb_flags;
+}
+
+static void cb710_mmc_reset_events(struct cb710_chip *chip)
+{
+ WRPORT(8, CB710_MMC_STATUS0_PORT, 0xFF);
+ WRPORT(8, CB710_MMC_STATUS1_PORT, 0xFF);
+ WRPORT(8, CB710_MMC_STATUS2_PORT, 0xFF);
+}
+
+static void cb710_receive_response(struct cb710_chip *chip,
+ struct mmc_command *cmd)
+{
+ unsigned rsp_opcode;
+
+ /* Looks like final byte with CRC is always stripped (like SDHCI) */
+ if (cmd->flags & MMC_RSP_136) {
+ u32 resp[4];
+
+ resp[0] = RDPORT(32, CB710_MMC_RESPONSE3_PORT);
+ resp[1] = RDPORT(32, CB710_MMC_RESPONSE2_PORT);
+ resp[2] = RDPORT(32, CB710_MMC_RESPONSE1_PORT);
+ resp[3] = RDPORT(32, CB710_MMC_RESPONSE0_PORT);
+ rsp_opcode = resp[0] >> 24;
+
+ cmd->resp[0] = (resp[0] << 8)|(resp[1] >> 24);
+ cmd->resp[1] = (resp[1] << 8)|(resp[2] >> 24);
+ cmd->resp[2] = (resp[2] << 8)|(resp[3] >> 24);
+ cmd->resp[3] = (resp[3] << 8);
+ } else {
+ rsp_opcode = RDPORT(32, CB710_MMC_RESPONSE1_PORT) & 0x3F;
+ cmd->resp[0] = RDPORT(32, CB710_MMC_RESPONSE0_PORT);
+ }
+
+ if (rsp_opcode != ((cmd->flags & MMC_RSP_OPCODE) ? cmd->opcode : 0x3F))
+ cmd->error = -EILSEQ;
+}
+
+static int cb710_mmc_transfer_data(struct cb710_chip *chip,
+ struct mmc_data *data)
+{
+ int error, to;
+
+ if (data->flags & MMC_DATA_READ)
+ error = cb710_mmc_receive(chip, data);
+ else
+ error = cb710_mmc_send(chip, data);
+
+ to = cb710_wait(chip, 4);
+ if (!error)
+ error = to;
+
+ if (!error) /* TODO: proper counting */
+ data->bytes_xfered = data->blksz * data->blocks;
+ return error;
+}
+
+static int cb710_mmc_command(struct mmc_host *mmc, struct mmc_command *cmd)
+{
+ struct cb710_chip *chip = cb710_mmc_to_chip(mmc);
+ struct cb710_mmc_reader *reader = mmc_priv(mmc);
+ struct mmc_data *data = cmd->data;
+
+ u16 cb_cmd = cb710_encode_cmd_flags(reader, cmd);
+ printk(KERN_INFO CB710_DRIVER_NAME ": %s: cmd request: 0x%04X\n",
+ mmc_hostname(mmc), cb_cmd);
+
+ if (data)
+ cb710_mmc_set_transfer_size(chip, data->blocks, data->blksz);
+
+ cb710_wait12(chip, 0x30);
+ WRPORT(16, CB710_MMC_CMD_TYPE_PORT, cb_cmd);
+ cb710_wait12(chip, 0x20);
+ WRPORT(32, CB710_MMC_CMD_PARAM_PORT, cmd->arg);
+ cb710_mmc_reset_events(chip);
+ cb710_wait12(chip, 0x20);
+ UPDPORT(8, 0x04, 0x01, 0x01);
+
+ cmd->error = cb710_wait(chip, 3);
+ if (cmd->error)
+ return -1;
+
+ if (cmd->flags & MMC_RSP_PRESENT) {
+ cb710_receive_response(chip, cmd);
+ if (cmd->error)
+ return -1;
+ }
+
+ reader->app_cmd = (!reader->app_cmd && cmd->opcode == 55);
+
+ if (data)
+ data->error = cb710_mmc_transfer_data(chip, data);
+ return 0;
+}
+
+static void cb710_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct cb710_chip *chip = cb710_mmc_to_chip(mmc);
+ struct cb710_mmc_reader *reader = mmc_priv(mmc);
+
+ verify_serialization(reader, &reader->active_req, 1);
+
+ WARN_ON(reader->mrq != NULL);
+
+ reader->mrq = mrq;
+ cb710_mmc_enable_irq(chip, 1);
+
+ if (cb710_mmc_is_card_inserted(chip)) {
+ if (!cb710_mmc_command(mmc, mrq->cmd) && mrq->stop)
+ cb710_mmc_command(mmc, mrq->stop);
+ mdelay(1);
+ } else {
+ mrq->cmd->error = -ENOMEDIUM;
+ }
+
+ tasklet_schedule(&reader->finish_req_tasklet);
+
+ verify_serialization(reader, &reader->active_req, 0);
+}
+
+static void cb710_mmc_powerup(struct cb710_chip *chip,
+ struct cb710_mmc_reader *reader)
+{
+ /* a lot of magic; see comment in cb710_mmc_set_clock() */
+ printk(KERN_INFO CB710_DRIVER_NAME ": powerup\n");
+ cb710_dump_regs(chip, 0x303);
+ cb710_wait12(chip, 0x20);
+ UPDPORT(8, 0x05, 0x80, 0);
+ UPDPORT(8, 0x07, 0x80, 0);
+ cb710_dump_regs(chip, 0x303);
+ mdelay(1);
+ printk(KERN_INFO CB710_DRIVER_NAME ": after delay 1\n");
+ cb710_dump_regs(chip, 0x303);
+ cb710_wait12(chip, 0x20);
+ UPDPORT(8, 0x05, 0x09, 0);
+ cb710_dump_regs(chip, 0x303);
+ mdelay(1);
+ printk(KERN_INFO CB710_DRIVER_NAME ": after delay 2\n");
+ cb710_dump_regs(chip, 0x303);
+ cb710_wait12(chip, 0x20);
+ UPDPORT(8, 0x05, 0, 0x08);
+ cb710_dump_regs(chip, 0x303);
+ mdelay(2);
+ printk(KERN_INFO CB710_DRIVER_NAME ": after delay 3\n");
+ cb710_dump_regs(chip, 0x303);
+ UPDPORT(8, 0x04, 0x06, 0);
+ UPDPORT(8, 0x05, 0x70, 0);
+ UPDPORT(8, 0x06, 0x80, 0);
+ UPDPORT(8, 0x07, 0x03, 0);
+ cb710_dump_regs(chip, 0x303);
+ cb710_wait12(chip, 0x20);
+ WRPORT(16, 0x08, 0xFFFF);
+ WRPORT(8, 0x09, 0xFF);
+ UPDPORT(8, 0x04, 0x06, 0);
+ cb710_dump_regs(chip, 0x303);
+ printk(KERN_INFO CB710_DRIVER_NAME ": finished\n");
+
+ reader->app_cmd = 0;
+}
+
+static void cb710_mmc_powerdown(struct cb710_chip *chip,
+ struct cb710_mmc_reader *reader)
+{
+ UPDPORT(8, 0x05, 0, 0x81);
+ UPDPORT(8, 0x07, 0, 0x80);
+ reader->app_cmd = 0;
+}
+
+static void cb710_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct cb710_chip *chip = cb710_mmc_to_chip(mmc);
+ struct cb710_mmc_reader *reader = mmc_priv(mmc);
+
+ verify_serialization(reader, &reader->active_ios, 1);
+
+ cb710_mmc_set_clock(mmc, ios->clock);
+
+ if (!cb710_mmc_is_card_inserted(chip)) {
+ printk(KERN_INFO CB710_DRIVER_NAME
+ ": no card inserted - ignoring bus powerup request\n");
+ ios->power_mode = MMC_POWER_OFF;
+ }
+
+ if (ios->power_mode != reader->last_power_mode)
+ switch (ios->power_mode) {
+ case MMC_POWER_ON:
+ cb710_mmc_powerup(chip, reader);
+ reader->last_power_mode = MMC_POWER_ON;
+ break;
+ case MMC_POWER_OFF:
+ cb710_mmc_powerdown(chip, reader);
+ reader->last_power_mode = MMC_POWER_OFF;
+ break;
+ case MMC_POWER_UP:
+ default:
+ /* ignore */;
+ }
+
+ cb710_mmc_enable_4bit_data(chip, ios->bus_width != MMC_BUS_WIDTH_1);
+
+ cb710_mmc_enable_irq(chip, 1);
+
+ verify_serialization(reader, &reader->active_ios, 0);
+}
+
+static int cb710_mmc_get_ro(struct mmc_host *mmc)
+{
+ struct cb710_chip *chip = cb710_mmc_to_chip(mmc);
+
+ return RDPORT(8, CB710_MMC_STATUS3_PORT)
+ & CB710_MMC_S3_WRITE_PROTECTED;
+}
+
+static int cb710_mmc_irq_handler(struct cb710_slot *slot)
+{
+ u32 status, config1, config2, irqen;
+ struct cb710_chip *chip = cb710_slot_to_chip(slot);
+#if 0
+ if (!(RDPORT(8, CB710_MMC_STATUS1_PORT) & CB710_MMC_S1_INTERRUPT))
+ return 0;
+#endif
+ status = RDPORT(32, 0x10);
+ irqen = RDPORT(32, 0x0C);
+ config2 = RDPORT(32, 0x08);
+ config1 = RDPORT(32, 0x04);
+ printk(KERN_INFO CB710_DRIVER_NAME ": interrupt; status: %08X, "
+ "ie: %08X, c2: %08X, c3: %08X\n",
+ status, irqen, config2, config1);
+
+ if (status & (CB710_MMC_S1_CARD_CHANGED << 8)) {
+ WRPORT(8, CB710_MMC_STATUS1_PORT, CB710_MMC_S1_CARD_CHANGED);
+ mmc_detect_change(cb710_slot_to_mmc(slot), HZ/2);
+ } else {
+ printk(KERN_INFO CB710_DRIVER_NAME ": unknown interrupt\n");
+ WRPORT(8, 0x0C, 0x00);
+ WRPORT(8, 0x0D, 0x90);
+ }
+
+ return 1;
+}
+
+static void cb710_mmc_finish_request_tasklet(unsigned long data)
+{
+ struct mmc_host *mmc = (void *)data;
+ struct cb710_mmc_reader *reader = mmc_priv(mmc);
+ struct mmc_request *mrq = reader->mrq;
+
+ reader->mrq = NULL;
+ mmc_request_done(mmc, mrq);
+}
+
+static const struct mmc_host_ops cb710_mmc_host = {
+ .request = cb710_mmc_request,
+ .set_ios = cb710_mmc_set_ios,
+ .get_ro = cb710_mmc_get_ro,
+ .enable_sdio_irq = NULL,
+};
+
+static int __devinit cb710_mmc_init(struct platform_device *pdev)
+{
+ struct cb710_slot *slot = container_of(pdev, struct cb710_slot, pdev);
+ struct cb710_chip *chip = dev_get_drvdata(pdev->dev.parent);
+ struct mmc_host *mmc;
+ struct cb710_mmc_reader *reader;
+ unsigned long flags;
+ int err;
+ u32 val;
+
+ mmc = mmc_alloc_host(sizeof(*reader), &chip->pdev->dev);
+ if (!mmc)
+ return -ENOMEM;
+
+ dev_set_drvdata(&pdev->dev, mmc);
+
+ /* harmless (maybe) magic */
+ pci_read_config_dword(chip->pdev, 0x48, &val);
+ val = cb710_src_freq_mhz[(val >> 16) & 0xF];
+ printk(KERN_INFO CB710_DRIVER_NAME ": %s: source frequency: %dMHz\n",
+ mmc_hostname(mmc), val
+ );
+ val *= 1000000;
+
+ mmc->ops = &cb710_mmc_host;
+ mmc->f_max = val;
+ mmc->f_min = val >> CB710_MMC_MAX_DIVIDER_LOG2;
+ mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34|MMC_VDD_34_35;
+ mmc->caps = MMC_CAP_4_BIT_DATA;
+
+ reader = mmc_priv(mmc);
+
+ tasklet_init(&reader->finish_req_tasklet,
+ cb710_mmc_finish_request_tasklet, (unsigned long)mmc);
+ spin_lock_init(&reader->serialization_lock);
+
+ cb710_dump_regs(chip, CB710_DUMP_REGS_MMC);
+
+ spin_lock_irqsave(&chip->irq_lock, flags);
+ slot->irq_handler = cb710_mmc_irq_handler;
+ spin_unlock_irqrestore(&chip->irq_lock, flags);
+
+ err = mmc_add_host(mmc);
+ if (!err)
+ return 0;
+
+ printk(KERN_INFO CB710_DRIVER_NAME ": %s: add_host failed: %d\n",
+ mmc_hostname(mmc), err);
+
+ mmc_free_host(mmc);
+ return err;
+}
+
+static int __devexit cb710_mmc_exit(struct platform_device *pdev)
+{
+ struct cb710_slot *slot = container_of(pdev, struct cb710_slot, pdev);
+ struct cb710_chip *chip = dev_get_drvdata(pdev->dev.parent);
+ struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
+ struct cb710_mmc_reader *reader = mmc_priv(mmc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&chip->irq_lock, flags);
+ slot->irq_handler = NULL;
+ spin_unlock_irqrestore(&chip->irq_lock, flags);
+
+ mmc_remove_host(mmc);
+
+ cb710_mmc_enable_irq(chip, 0);
+
+ /* clear config ports - just in case */
+ WRPORT(32, 0x04, 0);
+ WRPORT(16, 0x08, 0);
+
+ tasklet_kill(&reader->finish_req_tasklet);
+
+ mmc_free_host(mmc);
+ return 0;
+}
+
+static struct platform_driver cb710_mmc_driver = {
+ .driver.name = "cb710-mmc",
+ .probe = cb710_mmc_init,
+ .remove = __devexit_p(cb710_mmc_exit)
+};
+
+static int __init cb710_mmc_init_module(void)
+{
+ return platform_driver_register(&cb710_mmc_driver);
+}
+
+static void __exit cb710_mmc_cleanup_module(void)
+{
+ platform_driver_unregister(&cb710_mmc_driver);
+}
+
+module_init(cb710_mmc_init_module);
+module_exit(cb710_mmc_cleanup_module);
+
+MODULE_AUTHOR("Michał Mirosław <mirq-linux@...e.qmqm.pl>");
+MODULE_DESCRIPTION("ENE CB710 memory card reader driver - MMC/SD part");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:cb710-mmc");
diff -urN empty/sgbuf.c cb710-pre-20080913/sgbuf.c
--- empty/sgbuf.c 1970-01-01 01:00:00.000000000 +0100
+++ cb710-pre-20080913/sgbuf.c 2008-09-12 19:24:21.000000000 +0200
@@ -0,0 +1,200 @@
+/*
+ * cb710/sgbuf.c
+ *
+ * Copyleft by Michał Mirosław, 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/scatterlist.h>
+#include <linux/highmem.h>
+#include "cb710.h"
+
+#define CB710_SG_BUFFER_MASK (~(CB710_SG_BUFFER_BLOCK - 1))
+
+static void cb710_sg_init_element(struct cb710_sg_chain *buf)
+{
+ buf->cur_offset = 0;
+ buf->page_offset = buf->sg->offset & ~PAGE_MASK;
+ buf->page_no = buf->sg->offset >> PAGE_SHIFT;
+ buf->page = nth_page(sg_page(buf->sg), buf->page_no);
+
+ printk(KERN_INFO "sg: moved to new scatterlist entry: "
+ "first page +%d, poffs=%d, len=%d\n",
+ buf->page_no, buf->page_offset, buf->sg->length);
+}
+
+static void cb710_sg_unmap_page(struct cb710_sg_chain *buf, int to_sg)
+{
+ printk(KERN_INFO "sg: unmapping %s page\n",
+ to_sg ? "written" : "read");
+
+ if (to_sg)
+ flush_kernel_dcache_page(buf->page);
+ kunmap_atomic(buf->mapped_page, KM_BIO_SRC_IRQ);
+ buf->mapped_page = NULL;
+}
+
+static int cb710_sg_advance(struct cb710_sg_chain *buf, int advance, int to_sg)
+{
+ size_t rlen;
+ unsigned page_end;
+
+ buf->cur_offset += advance;
+ buf->page_offset += advance;
+ rlen = buf->sg->length - buf->cur_offset;
+
+ printk(KERN_INFO "sg: advanced %d bytes; "
+ "cur_offset=%d, page_offset=%d, rlen=%d\n",
+ advance, buf->cur_offset, buf->page_offset, rlen);
+
+ if (!rlen || buf->page_offset == PAGE_SIZE) {
+ if (buf->mapped_page)
+ cb710_sg_unmap_page(buf, to_sg);
+
+ if (!rlen) {
+ if (!--buf->sg_num) {
+ buf->need_bounce = 1;
+ return 0;
+ }
+ buf->sg = sg_next(buf->sg);
+ cb710_sg_init_element(buf);
+ rlen = buf->sg->length;
+ } else {
+ buf->page_offset = 0;
+ buf->page = nth_page(sg_page(buf->sg), ++buf->page_no);
+ }
+ }
+
+ page_end = (buf->page_offset + PAGE_SIZE) & PAGE_MASK;
+ buf->page_left = page_end - buf->page_offset;
+ if (buf->page_left > rlen)
+ buf->page_left = rlen;
+ if (buf->page_left < CB710_SG_BUFFER_BLOCK)
+ buf->need_bounce = 1;
+
+ if (!buf->mapped_page) {
+ buf->mapped_page = kmap_atomic(buf->page, KM_BIO_SRC_IRQ);
+ printk(KERN_INFO "sg: mapped new page: +%d @0x%p\n",
+ buf->page_no, buf->mapped_page);
+ }
+
+ return 1;
+}
+
+void cb710_sg_init(struct cb710_sg_chain *buf,
+ struct scatterlist *sg, size_t nelem)
+{
+ printk(KERN_INFO "sg: init: %d elements\n", nelem);
+ BUG_ON(!nelem);
+
+ memset(buf, 0, sizeof(*buf));
+ buf->sg = sg;
+ buf->sg_num = nelem;
+ cb710_sg_init_element(buf);
+ cb710_sg_advance(buf, 0, 0);
+}
+EXPORT_SYMBOL(cb710_sg_init);
+
+static int cb710_sg_use_bounce(struct cb710_sg_chain *buf, int to_sg)
+{
+ size_t len = 0;
+ size_t bounce_offset = 0;
+
+ do {
+ len = CB710_SG_BUFFER_BLOCK - bounce_offset;
+ if (len > buf->sg->length - buf->cur_offset)
+ len = buf->sg->length - buf->cur_offset;
+
+ if (to_sg)
+ memcpy(buf->mapped_page + buf->page_offset,
+ buf->bounce_buffer + bounce_offset, len);
+ else
+ memcpy(buf->bounce_buffer + bounce_offset,
+ buf->mapped_page + buf->page_offset, len);
+
+ bounce_offset += len;
+ } while (cb710_sg_advance(buf, len, to_sg)
+ && bounce_offset < CB710_SG_BUFFER_BLOCK);
+
+ printk(KERN_INFO "sg: %d bytes %s sg via bounce_buffer\n",
+ bounce_offset, to_sg ? "written to" : "to read from");
+ return bounce_offset;
+}
+
+static size_t cb710_sg_bounce_space(struct cb710_sg_chain *buf)
+{
+ struct scatterlist *sg;
+ unsigned i;
+ size_t len = buf->sg->length - buf->cur_offset;
+
+ if (len >= CB710_SG_BUFFER_BLOCK)
+ return CB710_SG_BUFFER_BLOCK;
+ if (buf->sg_num == 1)
+ return len;
+
+ for_each_sg(sg_next(buf->sg), sg, buf->sg_num - 1, i) {
+ len += sg->length;
+ if (len >= CB710_SG_BUFFER_BLOCK)
+ return CB710_SG_BUFFER_BLOCK;
+ }
+
+ return len;
+}
+
+int cb710_sg_next_buf(struct cb710_sg_chain *buf,
+ void **dataptr, size_t *len, int to_sg)
+{
+ printk(KERN_INFO "sg: next buffer to %s\n", to_sg ? "write" : "read");
+
+ if (buf->use_bounce) {
+ buf->use_bounce = 0;
+ cb710_sg_use_bounce(buf, 1);
+ }
+
+ if (buf->need_advance) {
+ cb710_sg_advance(buf, buf->need_advance, to_sg);
+ buf->need_advance = 0;
+ }
+
+ if (!buf->need_bounce) {
+ BUG_ON(!buf->mapped_page);
+
+ *dataptr = buf->mapped_page + buf->page_offset;
+ buf->need_advance = *len =
+ buf->page_left & CB710_SG_BUFFER_MASK;
+
+ printk(KERN_INFO "sg: %d bytes mapped directly\n", *len);
+ return 1;
+ }
+
+ if (!buf->sg_num)
+ return 0;
+
+ buf->need_bounce = 0;
+ *dataptr = &buf->bounce_buffer;
+
+ if (to_sg) {
+ *len = cb710_sg_bounce_space(buf);
+ printk(KERN_INFO "sg: "
+ "using bounce_buffer for writing %d bytes\n", *len);
+ buf->use_bounce = 1;
+ } else
+ *len = cb710_sg_use_bounce(buf, 0);
+
+ return *len != 0;
+}
+EXPORT_SYMBOL(cb710_sg_next_buf);
+
+void cb710_sg_abort(struct cb710_sg_chain *buf, int to_sg)
+{
+ printk(KERN_INFO "sg: aborting\n");
+
+ if (buf->mapped_page)
+ cb710_sg_unmap_page(buf, to_sg);
+}
+EXPORT_SYMBOL(cb710_sg_abort);
+
--
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