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>
diff --git a/include/linux/cb710.h b/include/linux/cb710.h
new file mode 100644
index 0000000..c3819e1
--- /dev/null
+++ b/include/linux/cb710.h
@@ -0,0 +1,238 @@
+/*
+ * cb710/cb710.h
+ *
+ * Copyright by Michał Mirosław, 2008-2009
+ *
+ * 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
+
+#ifdef CONFIG_CB710_DEBUG
+#define DEBUG
+#endif
+
+/* verify assumptions on platform_device framework */
+#define CONFIG_CB710_DEBUG_ASSUMPTIONS
+
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/mmc/host.h>
+
+struct cb710_slot;
+
+typedef int (*cb710_irq_handler_t)(struct cb710_slot *);
+
+/* per-virtual-slot structure */
+struct cb710_slot {
+ struct platform_device pdev;
+ void __iomem *iobase;
+ cb710_irq_handler_t irq_handler;
+};
+
+/* per-device structure */
+struct cb710_chip {
+ struct pci_dev *pdev;
+ void __iomem *iobase;
+ unsigned platform_id;
+#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
+ atomic_t slot_refs_count;
+#endif
+ unsigned slot_mask;
+ unsigned slots;
+ spinlock_t irq_lock;
+ struct cb710_slot slot[0];
+};
+
+/* NOTE: cb710_chip.slots is modified only during device init/exit and
+ * they are all serialized wrt themselves */
+
+/* cb710_chip.slot_mask values */
+#define CB710_SLOT_MMC 1
+#define CB710_SLOT_MS 2
+#define CB710_SLOT_SM 4
+
+/* slot port accessors - so the logic is more clear in the code */
+#define CB710_PORT_ACCESSORS(t) \
+static inline void cb710_write_port_##t(struct cb710_slot *slot, \
+ unsigned port, u##t value) \
+{ \
+ iowrite##t(value, slot->iobase + port); \
+} \
+ \
+static inline u##t cb710_read_port_##t(struct cb710_slot *slot, \
+ unsigned port) \
+{ \
+ return ioread##t(slot->iobase + port); \
+} \
+ \
+static inline void cb710_modify_port_##t(struct cb710_slot *slot, \
+ unsigned port, u##t set, u##t clear) \
+{ \
+ iowrite##t( \
+ (ioread##t(slot->iobase + port) & ~clear)|set, \
+ slot->iobase + port); \
+}
+
+CB710_PORT_ACCESSORS(8)
+CB710_PORT_ACCESSORS(16)
+CB710_PORT_ACCESSORS(32)
+
+void cb710_pci_update_config_reg(struct pci_dev *pdev,
+ int reg, uint32_t and, uint32_t xor);
+void cb710_set_irq_handler(struct cb710_slot *slot,
+ cb710_irq_handler_t handler);
+
+/* some device struct walking */
+
+static inline struct cb710_slot *cb710_pdev_to_slot(
+ struct platform_device *pdev)
+{
+ return container_of(pdev, struct cb710_slot, pdev);
+}
+
+static inline struct cb710_chip *cb710_slot_to_chip(struct cb710_slot *slot)
+{
+ return dev_get_drvdata(slot->pdev.dev.parent);
+}
+
+static inline struct device *cb710_slot_dev(struct cb710_slot *slot)
+{
+ return &slot->pdev.dev;
+}
+
+static inline struct device *cb710_chip_dev(struct cb710_chip *chip)
+{
+ return &chip->pdev->dev;
+}
+
+/* debugging aids */
+
+#ifdef CONFIG_CB710_DEBUG
+void cb710_dump_regs(struct cb710_chip *chip, unsigned dump);
+#else
+#define cb710_dump_regs(c, d) do {} while (0)
+#endif
+
+#define CB710_DUMP_REGS_MMC 0x0F
+#define CB710_DUMP_REGS_MS 0x30
+#define CB710_DUMP_REGS_SM 0xC0
+#define CB710_DUMP_REGS_ALL 0xFF
+#define CB710_DUMP_REGS_MASK 0xFF
+
+#define CB710_DUMP_ACCESS_8 0x100
+#define CB710_DUMP_ACCESS_16 0x200
+#define CB710_DUMP_ACCESS_32 0x400
+#define CB710_DUMP_ACCESS_ALL 0x700
+#define CB710_DUMP_ACCESS_MASK 0x700
+
+#endif /* LINUX_CB710_DRIVER_H */
+/*
+ * cb710/sgbuf2.h
+ *
+ * Copyright by Michał Mirosław, 2008-2009
+ *
+ * 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_SG_H
+#define LINUX_CB710_SG_H
+
+#include <linux/highmem.h>
+#include <linux/scatterlist.h>
+
+/**
+ * cb710_sg_miter_stop_writing - stop mapping iteration after writing
+ * @miter: sg mapping iter to be stopped
+ *
+ * Description:
+ * Stops mapping iterator @miter. @miter should have been started
+ * started using sg_miter_start(). A stopped iteration can be
+ * resumed by calling sg_miter_next() on it. This is useful when
+ * resources (kmap) need to be released during iteration.
+ *
+ * This is a convenience wrapper that will be optimized out for arches
+ * that don't need flush_kernel_dcache_page().
+ *
+ * Context:
+ * IRQ disabled if the SG_MITER_ATOMIC is set. Don't care otherwise.
+ */
+static inline void cb710_sg_miter_stop_writing(struct sg_mapping_iter *miter)
+{
+ if (miter->page)
+ flush_kernel_dcache_page(miter->page);
+ sg_miter_stop(miter);
+}
+
+/*
+ * 32-bit PIO mapping sg iterator
+ *
+ * Hides scatterlist access issues - fragment boundaries, alignment, page
+ * mapping - for drivers using 32-bit-word-at-a-time-PIO (ie. PCI devices
+ * without DMA support).
+ *
+ * Best-case reading (transfer from device):
+ * sg_miter_start();
+ * cb710_sg_dwiter_write_from_io();
+ * cb710_sg_miter_stop_writing();
+ *
+ * Best-case writing (transfer to device):
+ * sg_miter_start();
+ * cb710_sg_dwiter_read_to_io();
+ * sg_miter_stop();
+ */
+
+uint32_t cb710_sg_dwiter_read_next_block(struct sg_mapping_iter *miter);
+void cb710_sg_dwiter_write_next_block(struct sg_mapping_iter *miter, uint32_t data);
+
+/**
+ * cb710_sg_dwiter_write_from_io - transfer data to mapped buffer from 32-bit IO port
+ * @miter: sg mapping iter
+ * @port: PIO port - IO or MMIO address
+ * @count: number of 32-bit words to transfer
+ *
+ * Description:
+ * Reads @count 32-bit words from register @port and stores it in
+ * buffer iterated by @miter. Data that would overflow the buffer
+ * is silently ignored. Iterator is advanced by 4*@count bytes
+ * or to the buffer's end whichever is closer.
+ *
+ * Context:
+ * IRQ disabled if the SG_MITER_ATOMIC is set. Don't care otherwise.
+ */
+static inline void cb710_sg_dwiter_write_from_io(struct sg_mapping_iter *miter,
+ void __iomem *port, size_t count)
+{
+ while (count-- > 0)
+ cb710_sg_dwiter_write_next_block(miter, ioread32(port));
+}
+
+/**
+ * cb710_sg_dwiter_read_to_io - transfer data to 32-bit IO port from mapped buffer
+ * @miter: sg mapping iter
+ * @port: PIO port - IO or MMIO address
+ * @count: number of 32-bit words to transfer
+ *
+ * Description:
+ * Writes @count 32-bit words to register @port from buffer iterated
+ * through @miter. If buffer ends before @count words are written
+ * missing data is replaced by zeroes. @miter is advanced by 4*@count
+ * bytes or to the buffer's end whichever is closer.
+ *
+ * Context:
+ * IRQ disabled if the SG_MITER_ATOMIC is set. Don't care otherwise.
+ */
+static inline void cb710_sg_dwiter_read_to_io(struct sg_mapping_iter *miter,
+ void __iomem *port, size_t count)
+{
+ while (count-- > 0)
+ iowrite32(cb710_sg_dwiter_read_next_block(miter), port);
+}
+
+#endif /* LINUX_CB710_SG_H */
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index 19f8e6d..9f36e1c 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -2127,6 +2127,7 @@
#define PCI_VENDOR_ID_MAINPINE 0x1522
#define PCI_DEVICE_ID_MAINPINE_PBRIDGE 0x0100
#define PCI_VENDOR_ID_ENE 0x1524
+#define PCI_DEVICE_ID_ENE_CB710_FLASH 0x0510
#define PCI_DEVICE_ID_ENE_CB712_SD 0x0550
#define PCI_DEVICE_ID_ENE_CB712_SD_2 0x0551
#define PCI_DEVICE_ID_ENE_CB714_SD 0x0750