mmc: tmio: split core functionality, DMA and MFD glue
TMIO MMC chips contain an SD / SDIO IP core from Panasonic, similar to
the one, used in MN5774 and other MN57xx controllers. These IP cores are
included in many multifunction devices, in sh-mobile chips from Renesas,
in the latter case they can also use DMA. Some sh-mobile implementations
also have some other specialities, that MFD-based solutions don't have.
This makes supporting all these features in a monolithic driver inconveniet
and error-prone. This patch splits the driver into 3 parts: the core,
the MFD glue and the DMA support. In case of a modular build, two modules
will be built: mmc_tmio_core and mmc_tmio.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
new file mode 100644
index 0000000..8dedf0a
--- /dev/null
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -0,0 +1,145 @@
+/*
+ * linux/drivers/mmc/host/tmio_mmc.h
+ *
+ * Copyright (C) 2007 Ian Molton
+ * Copyright (C) 2004 Ian Molton
+ *
+ * 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.
+ *
+ * Driver for the MMC / SD / SDIO cell found in:
+ *
+ * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
+ */
+
+#ifndef TMIO_MMC_H
+#define TMIO_MMC_H
+
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+
+/* Definitions for values the CTRL_STATUS register can take. */
+#define TMIO_STAT_CMDRESPEND 0x00000001
+#define TMIO_STAT_DATAEND 0x00000004
+#define TMIO_STAT_CARD_REMOVE 0x00000008
+#define TMIO_STAT_CARD_INSERT 0x00000010
+#define TMIO_STAT_SIGSTATE 0x00000020
+#define TMIO_STAT_WRPROTECT 0x00000080
+#define TMIO_STAT_CARD_REMOVE_A 0x00000100
+#define TMIO_STAT_CARD_INSERT_A 0x00000200
+#define TMIO_STAT_SIGSTATE_A 0x00000400
+#define TMIO_STAT_CMD_IDX_ERR 0x00010000
+#define TMIO_STAT_CRCFAIL 0x00020000
+#define TMIO_STAT_STOPBIT_ERR 0x00040000
+#define TMIO_STAT_DATATIMEOUT 0x00080000
+#define TMIO_STAT_RXOVERFLOW 0x00100000
+#define TMIO_STAT_TXUNDERRUN 0x00200000
+#define TMIO_STAT_CMDTIMEOUT 0x00400000
+#define TMIO_STAT_RXRDY 0x01000000
+#define TMIO_STAT_TXRQ 0x02000000
+#define TMIO_STAT_ILL_FUNC 0x20000000
+#define TMIO_STAT_CMD_BUSY 0x40000000
+#define TMIO_STAT_ILL_ACCESS 0x80000000
+
+/* Definitions for values the CTRL_SDIO_STATUS register can take. */
+#define TMIO_SDIO_STAT_IOIRQ 0x0001
+#define TMIO_SDIO_STAT_EXPUB52 0x4000
+#define TMIO_SDIO_STAT_EXWT 0x8000
+#define TMIO_SDIO_MASK_ALL 0xc007
+
+/* Define some IRQ masks */
+/* This is the mask used at reset by the chip */
+#define TMIO_MASK_ALL 0x837f031d
+#define TMIO_MASK_READOP (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
+#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
+#define TMIO_MASK_CMD (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
+ TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
+#define TMIO_MASK_IRQ (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
+
+struct tmio_mmc_data;
+
+struct tmio_mmc_host {
+ void __iomem *ctl;
+ unsigned long bus_shift;
+ struct mmc_command *cmd;
+ struct mmc_request *mrq;
+ struct mmc_data *data;
+ struct mmc_host *mmc;
+ int irq;
+ unsigned int sdio_irq_enabled;
+
+ /* Callbacks for clock / power control */
+ void (*set_pwr)(struct platform_device *host, int state);
+ void (*set_clk_div)(struct platform_device *host, int state);
+
+ /* pio related stuff */
+ struct scatterlist *sg_ptr;
+ struct scatterlist *sg_orig;
+ unsigned int sg_len;
+ unsigned int sg_off;
+
+ struct platform_device *pdev;
+ struct tmio_mmc_data *pdata;
+
+ /* DMA support */
+ bool force_pio;
+ struct dma_chan *chan_rx;
+ struct dma_chan *chan_tx;
+ struct tasklet_struct dma_complete;
+ struct tasklet_struct dma_issue;
+ struct scatterlist bounce_sg;
+ u8 *bounce_buf;
+
+ /* Track lost interrupts */
+ struct delayed_work delayed_reset_work;
+ spinlock_t lock;
+ unsigned long last_req_ts;
+};
+
+int tmio_mmc_host_probe(struct tmio_mmc_host **host,
+ struct platform_device *pdev,
+ struct tmio_mmc_data *pdata);
+void tmio_mmc_host_remove(struct tmio_mmc_host *host);
+void tmio_mmc_do_data_irq(struct tmio_mmc_host *host);
+
+void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
+void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
+
+static inline char *tmio_mmc_kmap_atomic(struct scatterlist *sg,
+ unsigned long *flags)
+{
+ local_irq_save(*flags);
+ return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
+}
+
+static inline void tmio_mmc_kunmap_atomic(struct scatterlist *sg,
+ unsigned long *flags, void *virt)
+{
+ kunmap_atomic(virt - sg->offset, KM_BIO_SRC_IRQ);
+ local_irq_restore(*flags);
+}
+
+#ifdef CONFIG_TMIO_MMC_DMA
+void tmio_mmc_start_dma(struct tmio_mmc_host *host, struct mmc_data *data);
+void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata);
+void tmio_mmc_release_dma(struct tmio_mmc_host *host);
+#else
+static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host,
+ struct mmc_data *data)
+{
+}
+
+static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host,
+ struct tmio_mmc_data *pdata)
+{
+ host->chan_tx = NULL;
+ host->chan_rx = NULL;
+}
+
+static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host)
+{
+}
+#endif
+
+#endif