--- /dev/null
+/*
+ * linux/drivers/mmc/wbsd.c
+ *
+ * Copyright (C) 2004 Pierre Ossman, All Rights Reserved.
+ *
+ * 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/config.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/blkdev.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/protocol.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+
+#include "wbsd.h"
+
+#define DRIVER_NAME "wbsd"
+#define DRIVER_VERSION "1.0"
+
+#ifdef CONFIG_MMC_DEBUG
+#define DBG(x...) \
+ printk(KERN_DEBUG DRIVER_NAME ": " x)
+#define DBGF(f, x...) \
+ printk(KERN_DEBUG DRIVER_NAME " [%s()]: " f, __func__, ##x)
+#else
+#define DBG(x...) do { } while (0)
+#define DBGF(x...) do { } while (0)
+#endif
+
+static unsigned int io = 0x248;
+static unsigned int irq = 6;
+static int dma = 2;
+
+#ifdef CONFIG_MMC_DEBUG
+void DBG_REG(int reg, u8 value)
+{
+ int i;
+
+ printk(KERN_DEBUG "wbsd: Register %d: 0x%02X %3d '%c' ",
+ reg, (int)value, (int)value, (value < 0x20)?'.':value);
+
+ for (i = 7;i >= 0;i--)
+ {
+ if (value & (1 << i))
+ printk("x");
+ else
+ printk(".");
+ }
+
+ printk("\n");
+}
+#else
+#define DBG_REG(r, v) do {} while (0)
+#endif
+
+/*
+ * Basic functions
+ */
+
+static inline void wbsd_unlock_config(struct wbsd_host* host)
+{
+ outb(host->unlock_code, host->config);
+ outb(host->unlock_code, host->config);
+}
+
+static inline void wbsd_lock_config(struct wbsd_host* host)
+{
+ outb(LOCK_CODE, host->config);
+}
+
+static inline void wbsd_write_config(struct wbsd_host* host, u8 reg, u8 value)
+{
+ outb(reg, host->config);
+ outb(value, host->config + 1);
+}
+
+static inline u8 wbsd_read_config(struct wbsd_host* host, u8 reg)
+{
+ outb(reg, host->config);
+ return inb(host->config + 1);
+}
+
+static inline void wbsd_write_index(struct wbsd_host* host, u8 index, u8 value)
+{
+ outb(index, host->base + WBSD_IDXR);
+ outb(value, host->base + WBSD_DATAR);
+}
+
+static inline u8 wbsd_read_index(struct wbsd_host* host, u8 index)
+{
+ outb(index, host->base + WBSD_IDXR);
+ return inb(host->base + WBSD_DATAR);
+}
+
+/*
+ * Common routines
+ */
+
+static void wbsd_init_device(struct wbsd_host* host)
+{
+ u8 setup, ier;
+
+ /*
+ * Reset chip (SD/MMC part) and fifo.
+ */
+ setup = wbsd_read_index(host, WBSD_IDX_SETUP);
+ setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
+ wbsd_write_index(host, WBSD_IDX_SETUP, setup);
+
+ /*
+ * Read back default clock.
+ */
+ host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
+
+ /*
+ * Power down port.
+ */
+ outb(WBSD_POWER_N, host->base + WBSD_CSR);
+
+ /*
+ * Set maximum timeout.
+ */
+ wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
+
+ /*
+ * Enable interesting interrupts.
+ */
+ ier = 0;
+ ier |= WBSD_EINT_CARD;
+ ier |= WBSD_EINT_FIFO_THRE;
+ ier |= WBSD_EINT_CCRC;
+ ier |= WBSD_EINT_TIMEOUT;
+ ier |= WBSD_EINT_CRC;
+ ier |= WBSD_EINT_TC;
+
+ outb(ier, host->base + WBSD_EIR);
+
+ /*
+ * Clear interrupts.
+ */
+ inb(host->base + WBSD_ISR);
+}
+
+static void wbsd_reset(struct wbsd_host* host)
+{
+ u8 setup;
+
+ printk(KERN_ERR DRIVER_NAME ": Resetting chip\n");
+
+ /*
+ * Soft reset of chip (SD/MMC part).
+ */
+ setup = wbsd_read_index(host, WBSD_IDX_SETUP);
+ setup |= WBSD_SOFT_RESET;
+ wbsd_write_index(host, WBSD_IDX_SETUP, setup);
+}
+
+static void wbsd_request_end(struct wbsd_host* host, struct mmc_request* mrq)
+{
+ unsigned long dmaflags;
+
+ DBGF("Ending request, cmd (%x)\n", mrq->cmd->opcode);
+
+ if (host->dma >= 0)
+ {
+ /*
+ * Release ISA DMA controller.
+ */
+ dmaflags = claim_dma_lock();
+ disable_dma(host->dma);
+ clear_dma_ff(host->dma);
+ release_dma_lock(dmaflags);
+
+ /*
+ * Disable DMA on host.
+ */
+ wbsd_write_index(host, WBSD_IDX_DMA, 0);
+ }
+
+ host->mrq = NULL;
+
+ /*
+ * MMC layer might call back into the driver so first unlock.
+ */
+ spin_unlock(&host->lock);
+ mmc_request_done(host->mmc, mrq);
+ spin_lock(&host->lock);
+}
+
+/*
+ * Scatter/gather functions
+ */
+
+static inline void wbsd_init_sg(struct wbsd_host* host, struct mmc_data* data)
+{
+ struct request* req = data->req;
+
+ /*
+ * Get info. about SG list from data structure.
+ */
+ host->cur_sg = data->sg;
+ host->num_sg = data->sg_len;
+
+ host->offset = 0;
+ host->remain = host->cur_sg->length;
+}
+
+static inline int wbsd_next_sg(struct wbsd_host* host)
+{
+ /*
+ * Skip to next SG entry.
+ */
+ host->cur_sg++;
+ host->num_sg--;
+
+ /*
+ * Any entries left?
+ */
+ if (host->num_sg > 0)
+ {
+ host->offset = 0;
+ host->remain = host->cur_sg->length;
+ }
+
+ return host->num_sg;
+}
+
+static inline char* wbsd_kmap_sg(struct wbsd_host* host)
+{
+ return kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ) +
+ host->cur_sg->offset;
+}
+
+static inline void wbsd_kunmap_sg(struct wbsd_host* host)
+{
+ kunmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ);
+}
+
+static inline void wbsd_sg_to_dma(struct wbsd_host* host, struct mmc_data* data)
+{
+ unsigned int len, i, size;
+ struct scatterlist* sg;
+ char* dmabuf = host->dma_buffer;
+ char* sgbuf;
+
+ size = host->size;
+
+ sg = data->sg;
+ len = data->sg_len;
+
+ /*
+ * Just loop through all entries. Size might not
+ * be the entire list though so make sure that
+ * we do not transfer too much.
+ */
+ for (i = 0;i < len;i++)
+ {
+ sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
+ if (size < sg[i].length)
+ memcpy(dmabuf, sgbuf, size);
+ else
+ memcpy(dmabuf, sgbuf, sg[i].length);
+ kunmap_atomic(sg[i].page, KM_BIO_SRC_IRQ);
+ dmabuf += sg[i].length;
+
+ if (size < sg[i].length)
+ size = 0;
+ else
+ size -= sg[i].length;
+
+ if (size == 0)
+ break;
+ }
+
+ /*
+ * Check that we didn't get a request to transfer
+ * more data than can fit into the SG list.
+ */
+
+ BUG_ON(size != 0);
+
+ host->size -= size;
+}
+
+static inline void wbsd_dma_to_sg(struct wbsd_host* host, struct mmc_data* data)
+{
+ unsigned int len, i, size;
+ struct scatterlist* sg;
+ char* dmabuf = host->dma_buffer;
+ char* sgbuf;
+
+ size = host->size;
+
+ sg = data->sg;
+ len = data->sg_len;
+
+ /*
+ * Just loop through all entries. Size might not
+ * be the entire list though so make sure that
+ * we do not transfer too much.
+ */
+ for (i = 0;i < len;i++)
+ {
+ sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
+ if (size < sg[i].length)
+ memcpy(sgbuf, dmabuf, size);
+ else
+ memcpy(sgbuf, dmabuf, sg[i].length);
+ kunmap_atomic(sg[i].page, KM_BIO_SRC_IRQ);
+ dmabuf += sg[i].length;
+
+ if (size < sg[i].length)
+ size = 0;
+ else
+ size -= sg[i].length;
+
+ if (size == 0)
+ break;
+ }
+
+ /*
+ * Check that we didn't get a request to transfer
+ * more data than can fit into the SG list.
+ */
+
+ BUG_ON(size != 0);
+
+ host->size -= size;
+}
+
+/*
+ * Command handling
+ */
+
+static inline void wbsd_get_short_reply(struct wbsd_host* host,
+ struct mmc_command* cmd)
+{
+ /*
+ * Correct response type?
+ */
+ if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT)
+ {
+ cmd->error = MMC_ERR_INVALID;
+ return;
+ }
+
+ cmd->resp[0] =
+ wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
+ cmd->resp[0] |=
+ wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
+ cmd->resp[0] |=
+ wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
+ cmd->resp[0] |=
+ wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
+ cmd->resp[1] =
+ wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
+}
+
+static inline void wbsd_get_long_reply(struct wbsd_host* host,
+ struct mmc_command* cmd)
+{
+ int i;
+
+ /*
+ * Correct response type?
+ */
+ if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG)
+ {
+ cmd->error = MMC_ERR_INVALID;
+ return;
+ }
+
+ for (i = 0;i < 4;i++)
+ {
+ cmd->resp[i] =
+ wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
+ cmd->resp[i] |=
+ wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
+ cmd->resp[i] |=
+ wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
+ cmd->resp[i] |=
+ wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
+ }
+}
+
+static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs);
+
+static void wbsd_send_command(struct wbsd_host* host, struct mmc_command* cmd)
+{
+ int i;
+ u8 status, eir, isr;
+
+ DBGF("Sending cmd (%x)\n", cmd->opcode);
+
+ /*
+ * Disable interrupts as the interrupt routine
+ * will destroy the contents of ISR.
+ */
+ eir = inb(host->base + WBSD_EIR);
+ outb(0, host->base + WBSD_EIR);
+
+ /*
+ * Send the command (CRC calculated by host).
+ */
+ outb(cmd->opcode, host->base + WBSD_CMDR);
+ for (i = 3;i >= 0;i--)
+ outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
+
+ cmd->error = MMC_ERR_NONE;
+
+ /*
+ * Wait for the request to complete.
+ */
+ do {
+ status = wbsd_read_index(host, WBSD_IDX_STATUS);
+ } while (status & WBSD_CARDTRAFFIC);
+
+ /*
+ * Do we expect a reply?
+ */
+ if ((cmd->flags & MMC_RSP_MASK) != MMC_RSP_NONE)
+ {
+ /*
+ * Read back status.
+ */
+ isr = inb(host->base + WBSD_ISR);
+
+ /* Card removed? */
+ if (isr & WBSD_INT_CARD)
+ cmd->error = MMC_ERR_TIMEOUT;
+ /* Timeout? */
+ else if (isr & WBSD_INT_TIMEOUT)
+ cmd->error = MMC_ERR_TIMEOUT;
+ /* CRC? */
+ else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
+ cmd->error = MMC_ERR_BADCRC;
+ /* All ok */
+ else
+ {
+ if ((cmd->flags & MMC_RSP_MASK) == MMC_RSP_SHORT)
+ wbsd_get_short_reply(host, cmd);
+ else
+ wbsd_get_long_reply(host, cmd);
+ }
+ }
+
+ /*
+ * Restore interrupt mask to previous value.
+ */
+ outb(eir, host->base + WBSD_EIR);
+
+ /*
+ * Call the interrupt routine to jump start
+ * interrupts.
+ */
+ wbsd_irq(0, host, NULL);
+
+ DBGF("Sent cmd (%x), res %d\n", cmd->opcode, cmd->error);
+}
+
+/*
+ * Data functions
+ */
+
+static void wbsd_empty_fifo(struct wbsd_host* host)
+{
+ struct mmc_data* data = host->mrq->cmd->data;
+ char* buffer;
+
+ /*
+ * Handle excessive data.
+ */
+ if (data->bytes_xfered == host->size)
+ return;
+
+ buffer = wbsd_kmap_sg(host) + host->offset;
+
+ /*
+ * Drain the fifo. This has a tendency to loop longer
+ * than the FIFO length (usually one block).
+ */
+ while (!(inb(host->base + WBSD_FSR) & WBSD_FIFO_EMPTY))
+ {
+ *buffer = inb(host->base + WBSD_DFR);
+ buffer++;
+ host->offset++;
+ host->remain--;
+
+ data->bytes_xfered++;
+
+ /*
+ * Transfer done?
+ */
+ if (data->bytes_xfered == host->size)
+ {
+ wbsd_kunmap_sg(host);
+ return;
+ }
+
+ /*
+ * End of scatter list entry?
+ */
+ if (host->remain == 0)
+ {
+ wbsd_kunmap_sg(host);
+
+ /*
+ * Get next entry. Check if last.
+ */
+ if (!wbsd_next_sg(host))
+ {
+ /*
+ * We should never reach this point.
+ * It means that we're trying to
+ * transfer more blocks than can fit
+ * into the scatter list.
+ */
+ BUG_ON(1);
+
+ host->size = data->bytes_xfered;
+
+ return;
+ }
+
+ buffer = wbsd_kmap_sg(host);
+ }
+ }
+
+ wbsd_kunmap_sg(host);
+}
+
+static void wbsd_fill_fifo(struct wbsd_host* host)
+{
+ struct mmc_data* data = host->mrq->cmd->data;
+ char* buffer;
+
+ /*
+ * Check that we aren't being called after the
+ * entire buffer has been transfered.
+ */
+ if (data->bytes_xfered == host->size)
+ return;
+
+ buffer = wbsd_kmap_sg(host) + host->offset;
+
+ /*
+ * Fill the fifo. This has a tendency to loop longer
+ * than the FIFO length (usually one block).
+ */
+ while (!(inb(host->base + WBSD_FSR) & WBSD_FIFO_FULL))
+ {
+ outb(*buffer, host->base + WBSD_DFR);
+ buffer++;
+ host->offset++;
+ host->remain--;
+
+ data->bytes_xfered++;
+
+ /*
+ * Transfer done?
+ */
+ if (data->bytes_xfered == host->size)
+ {
+ wbsd_kunmap_sg(host);
+ return;
+ }
+
+ /*
+ * End of scatter list entry?
+ */
+ if (host->remain == 0)
+ {
+ wbsd_kunmap_sg(host);
+
+ /*
+ * Get next entry. Check if last.
+ */
+ if (!wbsd_next_sg(host))
+ {
+ /*
+ * We should never reach this point.
+ * It means that we're trying to
+ * transfer more blocks than can fit
+ * into the scatter list.
+ */
+ BUG_ON(1);
+
+ host->size = data->bytes_xfered;
+
+ return;
+ }
+
+ buffer = wbsd_kmap_sg(host);
+ }
+ }
+
+ wbsd_kunmap_sg(host);
+}
+
+static void wbsd_prepare_data(struct wbsd_host* host, struct mmc_data* data)
+{
+ u16 blksize;
+ u8 setup;
+ unsigned long dmaflags;
+
+ DBGF("blksz %04x blks %04x flags %08x\n",
+ 1 << data->blksz_bits, data->blocks, data->flags);
+ DBGF("tsac %d ms nsac %d clk\n",
+ data->timeout_ns / 1000000, data->timeout_clks);
+
+ /*
+ * Calculate size.
+ */
+ host->size = data->blocks << data->blksz_bits;
+
+ /*
+ * Check timeout values for overflow.
+ * (Yes, some cards cause this value to overflow).
+ */
+ if (data->timeout_ns > 127000000)
+ wbsd_write_index(host, WBSD_IDX_TAAC, 127);
+ else
+ wbsd_write_index(host, WBSD_IDX_TAAC, data->timeout_ns/1000000);
+
+ if (data->timeout_clks > 255)
+ wbsd_write_index(host, WBSD_IDX_NSAC, 255);
+ else
+ wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
+
+ /*
+ * Inform the chip of how large blocks will be
+ * sent. It needs this to determine when to
+ * calculate CRC.
+ *
+ * Space for CRC must be included in the size.
+ */
+ blksize = (1 << data->blksz_bits) + 2;
+
+ wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
+ wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
+
+ /*
+ * Clear the FIFO. This is needed even for DMA
+ * transfers since the chip still uses the FIFO
+ * internally.
+ */
+ setup = wbsd_read_index(host, WBSD_IDX_SETUP);
+ setup |= WBSD_FIFO_RESET;
+ wbsd_write_index(host, WBSD_IDX_SETUP, setup);
+
+ /*
+ * DMA transfer?
+ */
+ if (host->dma >= 0)
+ {
+ /*
+ * The buffer for DMA is only 64 kB.
+ */
+ BUG_ON(host->size > 0x10000);
+ if (host->size > 0x10000)
+ {
+ data->error = MMC_ERR_INVALID;
+ return;
+ }
+
+ /*
+ * Transfer data from the SG list to
+ * the DMA buffer.
+ */
+ if (data->flags & MMC_DATA_WRITE)
+ wbsd_sg_to_dma(host, data);
+
+ /*
+ * Initialise the ISA DMA controller.
+ */
+ dmaflags = claim_dma_lock();
+ disable_dma(host->dma);
+ clear_dma_ff(host->dma);
+ if (data->flags & MMC_DATA_READ)
+ set_dma_mode(host->dma, DMA_MODE_READ);
+ else
+ set_dma_mode(host->dma, DMA_MODE_WRITE);
+ set_dma_addr(host->dma, host->dma_addr);
+ set_dma_count(host->dma, host->size);
+
+ enable_dma(host->dma);
+ release_dma_lock(dmaflags);
+
+ /*
+ * Enable DMA on the host.
+ */
+ wbsd_write_index(host, WBSD_IDX_DMA,
+ WBSD_DMA_SINGLE | WBSD_DMA_ENABLE);
+ }
+ else
+ {
+ /*
+ * This flag is used to keep printk
+ * output to a minimum.
+ */
+ host->firsterr = 1;
+
+ /*
+ * Initialise the SG list.
+ */
+ wbsd_init_sg(host, data);
+
+ /*
+ * Turn off DMA.
+ */
+ wbsd_write_index(host, WBSD_IDX_DMA, 0);
+
+ /*
+ * Set up FIFO threshold levels (and fill
+ * buffer if doing a write).
+ */
+ if (data->flags & MMC_DATA_READ)
+ {
+ wbsd_write_index(host, WBSD_IDX_FIFOEN,
+ WBSD_FIFOEN_FULL | 8);
+ }
+ else
+ {
+ wbsd_write_index(host, WBSD_IDX_FIFOEN,
+ WBSD_FIFOEN_EMPTY | 8);
+ wbsd_fill_fifo(host);
+ }
+ }
+
+ data->error = MMC_ERR_NONE;
+}
+
+static void wbsd_finish_data(struct wbsd_host* host, struct mmc_data* data)
+{
+ unsigned long dmaflags;
+ int count;
+
+ WARN_ON(host->mrq == NULL);
+
+ /*
+ * Send a stop command if needed.
+ */
+ if (data->stop)
+ wbsd_send_command(host, data->stop);
+
+ /*
+ * DMA transfer?
+ */
+ if (host->dma >= 0)
+ {
+ /*
+ * Disable DMA on the host.
+ */
+ wbsd_write_index(host, WBSD_IDX_DMA, 0);
+
+ /*
+ * Turn of ISA DMA controller.
+ */
+ dmaflags = claim_dma_lock();
+ disable_dma(host->dma);
+ clear_dma_ff(host->dma);
+ count = get_dma_residue(host->dma);
+ release_dma_lock(dmaflags);
+
+ /*
+ * Any leftover data?
+ */
+ if (count)
+ {
+ printk(KERN_ERR DRIVER_NAME ": Incomplete DMA "
+ "transfer. %d bytes left.\n", count);
+
+ data->error = MMC_ERR_FAILED;
+ }
+ else
+ {
+ /*
+ * Transfer data from DMA buffer to
+ * SG list.
+ */
+ if (data->flags & MMC_DATA_READ)
+ wbsd_dma_to_sg(host, data);
+
+ data->bytes_xfered = host->size;
+ }
+ }
+
+ DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered);
+
+ wbsd_request_end(host, host->mrq);
+}
+
+/*
+ * MMC Callbacks
+ */
+
+static void wbsd_request(struct mmc_host* mmc, struct mmc_request* mrq)
+{
+ struct wbsd_host* host = mmc_priv(mmc);
+ struct mmc_command* cmd;
+
+ /*
+ * Disable tasklets to avoid a deadlock.
+ */
+ spin_lock_bh(&host->lock);
+
+ BUG_ON(host->mrq != NULL);
+
+ cmd = mrq->cmd;
+
+ host->mrq = mrq;
+
+ /*
+ * If there is no card in the slot then
+ * timeout immediatly.
+ */
+ if (!(inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT))
+ {
+ cmd->error = MMC_ERR_TIMEOUT;
+ goto done;
+ }
+
+ /*
+ * Does the request include data?
+ */
+ if (cmd->data)
+ {
+ wbsd_prepare_data(host, cmd->data);
+
+ if (cmd->data->error != MMC_ERR_NONE)
+ goto done;
+ }
+
+ wbsd_send_command(host, cmd);
+
+ /*
+ * If this is a data transfer the request
+ * will be finished after the data has
+ * transfered.
+ */
+ if (cmd->data && (cmd->error == MMC_ERR_NONE))
+ {
+ spin_unlock_bh(&host->lock);
+
+ return;
+ }
+
+done:
+ wbsd_request_end(host, mrq);
+
+ spin_unlock_bh(&host->lock);
+}
+
+static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
+{
+ struct wbsd_host* host = mmc_priv(mmc);
+ u8 clk, setup, pwr;
+
+ DBGF("clock %uHz busmode %u powermode %u Vdd %u\n",
+ ios->clock, ios->bus_mode, ios->power_mode, ios->vdd);
+
+ spin_lock_bh(&host->lock);
+
+ /*
+ * Reset the chip on each power off.
+ * Should clear out any weird states.
+ */
+ if (ios->power_mode == MMC_POWER_OFF)
+ wbsd_init_device(host);
+
+ if (ios->clock >= 24000000)
+ clk = WBSD_CLK_24M;
+ else if (ios->clock >= 16000000)
+ clk = WBSD_CLK_16M;
+ else if (ios->clock >= 12000000)
+ clk = WBSD_CLK_12M;
+ else
+ clk = WBSD_CLK_375K;
+
+ /*
+ * Only write to the clock register when
+ * there is an actual change.
+ */
+ if (clk != host->clk)
+ {
+ wbsd_write_index(host, WBSD_IDX_CLK, clk);
+ host->clk = clk;
+ }
+
+ if (ios->power_mode != MMC_POWER_OFF)
+ {
+ /*
+ * Power up card.
+ */
+ pwr = inb(host->base + WBSD_CSR);
+ pwr &= ~WBSD_POWER_N;
+ outb(pwr, host->base + WBSD_CSR);
+
+ /*
+ * This behaviour is stolen from the
+ * Windows driver. Don't know why, but
+ * it is needed.
+ */
+ setup = wbsd_read_index(host, WBSD_IDX_SETUP);
+ if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
+ setup |= WBSD_DAT3_H;
+ else
+ setup &= ~WBSD_DAT3_H;
+ wbsd_write_index(host, WBSD_IDX_SETUP, setup);
+
+ mdelay(1);
+ }
+
+ spin_unlock_bh(&host->lock);
+}
+
+/*
+ * Tasklets
+ */
+
+inline static struct mmc_data* wbsd_get_data(struct wbsd_host* host)
+{
+ WARN_ON(!host->mrq);
+ if (!host->mrq)
+ return NULL;
+
+ WARN_ON(!host->mrq->cmd);
+ if (!host->mrq->cmd)
+ return NULL;
+
+ WARN_ON(!host->mrq->cmd->data);
+ if (!host->mrq->cmd->data)
+ return NULL;
+
+ return host->mrq->cmd->data;
+}
+
+static void wbsd_tasklet_card(unsigned long param)
+{
+ struct wbsd_host* host = (struct wbsd_host*)param;
+ u8 csr;
+
+ spin_lock(&host->lock);
+
+ csr = inb(host->base + WBSD_CSR);
+ WARN_ON(csr == 0xff);
+
+ if (csr & WBSD_CARDPRESENT)
+ DBG("Card inserted\n");
+ else
+ {
+ DBG("Card removed\n");
+
+ if (host->mrq)
+ {
+ printk(KERN_ERR DRIVER_NAME
+ ": Card removed during transfer!\n");
+ wbsd_reset(host);
+
+ host->mrq->cmd->error = MMC_ERR_FAILED;
+ tasklet_schedule(&host->finish_tasklet);
+ }
+ }
+
+ /*
+ * Unlock first since we might get a call back.
+ */
+ spin_unlock(&host->lock);
+
+ mmc_detect_change(host->mmc);
+}
+
+static void wbsd_tasklet_fifo(unsigned long param)
+{
+ struct wbsd_host* host = (struct wbsd_host*)param;
+ struct mmc_data* data;
+
+ spin_lock(&host->lock);
+
+ if (!host->mrq)
+ goto end;
+
+ data = wbsd_get_data(host);
+ if (!data)
+ goto end;
+
+ if (data->flags & MMC_DATA_WRITE)
+ wbsd_fill_fifo(host);
+ else
+ wbsd_empty_fifo(host);
+
+ /*
+ * Done?
+ */
+ if (host->size == data->bytes_xfered)
+ {
+ wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
+ tasklet_schedule(&host->finish_tasklet);
+ }
+
+end:
+ spin_unlock(&host->lock);
+}
+
+static void wbsd_tasklet_crc(unsigned long param)
+{
+ struct wbsd_host* host = (struct wbsd_host*)param;
+ struct mmc_data* data;
+
+ spin_lock(&host->lock);
+
+ WARN_ON(!host->mrq);
+ if (!host->mrq)
+ goto end;
+
+ data = wbsd_get_data(host);
+ if (!data)
+ goto end;
+
+ DBGF("CRC error\n");
+
+ data->error = MMC_ERR_BADCRC;
+
+ tasklet_schedule(&host->finish_tasklet);
+
+end:
+ spin_unlock(&host->lock);
+}
+
+static void wbsd_tasklet_timeout(unsigned long param)
+{
+ struct wbsd_host* host = (struct wbsd_host*)param;
+ struct mmc_data* data;
+
+ spin_lock(&host->lock);
+
+ WARN_ON(!host->mrq);
+ if (!host->mrq)
+ goto end;
+
+ data = wbsd_get_data(host);
+ if (!data)
+ goto end;
+
+ DBGF("Timeout\n");
+
+ data->error = MMC_ERR_TIMEOUT;
+
+ tasklet_schedule(&host->finish_tasklet);
+
+end:
+ spin_unlock(&host->lock);
+}
+
+static void wbsd_tasklet_finish(unsigned long param)
+{
+ struct wbsd_host* host = (struct wbsd_host*)param;
+ struct mmc_data* data;
+
+ spin_lock(&host->lock);
+
+ WARN_ON(!host->mrq);
+ if (!host->mrq)
+ goto end;
+
+ data = wbsd_get_data(host);
+ if (!data)
+ goto end;
+
+ wbsd_finish_data(host, data);
+
+end:
+ spin_unlock(&host->lock);
+}
+
+static void wbsd_tasklet_block(unsigned long param)
+{
+ struct wbsd_host* host = (struct wbsd_host*)param;
+ struct mmc_data* data;
+
+ spin_lock(&host->lock);
+
+ if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) !=
+ WBSD_CRC_OK)
+ {
+ data = wbsd_get_data(host);
+ if (!data)
+ goto end;
+
+ DBGF("CRC error\n");
+
+ data->error = MMC_ERR_BADCRC;
+
+ tasklet_schedule(&host->finish_tasklet);
+ }
+
+end:
+ spin_unlock(&host->lock);
+}
+
+/*
+ * Interrupt handling
+ */
+
+static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct wbsd_host* host = dev_id;
+ int isr;
+
+ isr = inb(host->base + WBSD_ISR);
+
+ /*
+ * Was it actually our hardware that caused the interrupt?
+ */
+ if (isr == 0xff || isr == 0x00)
+ return IRQ_NONE;
+
+ /*
+ * Schedule tasklets as needed.
+ */
+ if (isr & WBSD_INT_CARD)
+ tasklet_schedule(&host->card_tasklet);
+ if (isr & WBSD_INT_FIFO_THRE)
+ tasklet_hi_schedule(&host->fifo_tasklet);
+ if (isr & WBSD_INT_CRC)
+ tasklet_hi_schedule(&host->crc_tasklet);
+ if (isr & WBSD_INT_TIMEOUT)
+ tasklet_hi_schedule(&host->timeout_tasklet);
+ if (isr & WBSD_INT_BUSYEND)
+ tasklet_hi_schedule(&host->block_tasklet);
+ if (isr & WBSD_INT_TC)
+ tasklet_schedule(&host->finish_tasklet);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Support functions for probe
+ */
+
+static int wbsd_scan(struct wbsd_host* host)
+{
+ int i, j, k;
+ int id;
+
+ /*
+ * Iterate through all ports, all codes to
+ * find hardware that is in our known list.
+ */
+ for (i = 0;i < sizeof(config_ports)/sizeof(int);i++)
+ {
+ if (!request_region(config_ports[i], 2, DRIVER_NAME))
+ continue;
+
+ for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++)
+ {
+ id = 0xFFFF;
+
+ outb(unlock_codes[j], config_ports[i]);
+ outb(unlock_codes[j], config_ports[i]);
+
+ outb(WBSD_CONF_ID_HI, config_ports[i]);
+ id = inb(config_ports[i] + 1) << 8;
+
+ outb(WBSD_CONF_ID_LO, config_ports[i]);
+ id |= inb(config_ports[i] + 1);
+
+ for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++)
+ {
+ if (id == valid_ids[k])
+ {
+ host->chip_id = id;
+ host->config = config_ports[i];
+ host->unlock_code = unlock_codes[i];
+
+ return 0;
+ }
+ }
+
+ if (id != 0xFFFF)
+ {
+ DBG("Unknown hardware (id %x) found at %x\n",
+ id, config_ports[i]);
+ }
+
+ outb(LOCK_CODE, config_ports[i]);
+ }
+
+ release_region(config_ports[i], 2);
+ }
+
+ return -ENODEV;
+}
+
+static int wbsd_request_regions(struct wbsd_host* host)
+{
+ if (io & 0x7)
+ return -EINVAL;
+
+ if (!request_region(io, 8, DRIVER_NAME))
+ return -EIO;
+
+ host->base = io;
+
+ return 0;
+}
+
+static void wbsd_release_regions(struct wbsd_host* host)
+{
+ if (host->base)
+ release_region(host->base, 8);
+
+ if (host->config)
+ release_region(host->config, 2);
+}
+
+static void wbsd_init_dma(struct wbsd_host* host)
+{
+ host->dma = -1;
+
+ if (dma < 0)
+ return;
+
+ if (request_dma(dma, DRIVER_NAME))
+ goto err;
+
+ /*
+ * We need to allocate a special buffer in
+ * order for ISA to be able to DMA to it.
+ */
+ host->dma_buffer = kmalloc(65536,
+ GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
+ if (!host->dma_buffer)
+ goto free;
+
+ /*
+ * Translate the address to a physical address.
+ */
+ host->dma_addr = isa_virt_to_bus(host->dma_buffer);
+
+ /*
+ * ISA DMA must be aligned on a 64k basis.
+ */
+ if ((host->dma_addr & 0xffff) != 0)
+ goto kfree;
+ /*
+ * ISA cannot access memory above 16 MB.
+ */
+ else if (host->dma_addr >= 0x1000000)
+ goto kfree;
+
+ host->dma = dma;
+
+ return;
+
+kfree:
+ /*
+ * If we've gotten here then there is some kind of alignment bug
+ */
+ BUG_ON(1);
+
+ kfree(host->dma_buffer);
+ host->dma_buffer = NULL;
+
+free:
+ free_dma(dma);
+
+err:
+ printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. "
+ "Falling back on FIFO.\n", dma);
+}
+
+static struct mmc_host_ops wbsd_ops = {
+ .request = wbsd_request,
+ .set_ios = wbsd_set_ios,
+};
+
+/*
+ * Device probe
+ */
+
+static int wbsd_probe(struct device* dev)
+{
+ struct wbsd_host* host = NULL;
+ struct mmc_host* mmc = NULL;
+ int ret;
+
+ /*
+ * Allocate MMC structure.
+ */
+ mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
+ if (!mmc)
+ return -ENOMEM;
+
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+
+ /*
+ * Scan for hardware.
+ */
+ ret = wbsd_scan(host);
+ if (ret)
+ goto freemmc;
+
+ /*
+ * Reset the chip.
+ */
+ wbsd_write_config(host, WBSD_CONF_SWRST, 1);
+ wbsd_write_config(host, WBSD_CONF_SWRST, 0);
+
+ /*
+ * Allocate I/O ports.
+ */
+ ret = wbsd_request_regions(host);
+ if (ret)
+ goto release;
+
+ /*
+ * Set host parameters.
+ */
+ mmc->ops = &wbsd_ops;
+ mmc->f_min = 375000;
+ mmc->f_max = 24000000;
+ mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
+
+ spin_lock_init(&host->lock);
+
+ /*
+ * Select SD/MMC function.
+ */
+ wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
+
+ /*
+ * Set up card detection.
+ */
+ wbsd_write_config(host, WBSD_CONF_PINS, 0x02);
+
+ /*
+ * Configure I/O port.
+ */
+ wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
+ wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
+
+ /*
+ * Allocate interrupt.
+ */
+ ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host);
+ if (ret)
+ goto release;
+
+ host->irq = irq;
+
+ /*
+ * Set up tasklets.
+ */
+ tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host);
+ tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host);
+ tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host);
+ tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host);
+ tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host);
+ tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host);
+
+ /*
+ * Configure interrupt.
+ */
+ wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
+
+ /*
+ * Allocate DMA.
+ */
+ wbsd_init_dma(host);
+
+ /*
+ * If all went well, then configure DMA.
+ */
+ if (host->dma >= 0)
+ wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
+
+ /*
+ * Maximum number of segments. Worst case is one sector per segment
+ * so this will be 64kB/512.
+ */
+ mmc->max_hw_segs = NR_SG;
+ mmc->max_phys_segs = NR_SG;
+
+ /*
+ * Maximum number of sectors in one transfer. Also limited by 64kB
+ * buffer.
+ */
+ mmc->max_sectors = 128;
+
+ /*
+ * Maximum segment size. Could be one segment with the maximum number
+ * of segments.
+ */
+ mmc->max_seg_size = mmc->max_sectors * 512;
+
+ /*
+ * Enable chip.
+ */
+ wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
+
+ /*
+ * Power up chip.
+ */
+ wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
+
+ /*
+ * Power Management stuff. No idea how this works.
+ * Not tested.
+ */
+#ifdef CONFIG_PM
+ wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
+#endif
+
+ /*
+ * Reset the chip into a known state.
+ */
+ wbsd_init_device(host);
+
+ dev_set_drvdata(dev, mmc);
+
+ /*
+ * Add host to MMC layer.
+ */
+ mmc_add_host(mmc);
+
+ printk(KERN_INFO "%s: W83L51xD id %x at 0x%x irq %d dma %d\n",
+ mmc->host_name, (int)host->chip_id, (int)host->base,
+ (int)host->irq, (int)host->dma);
+
+ return 0;
+
+release:
+ wbsd_release_regions(host);
+
+freemmc:
+ mmc_free_host(mmc);
+
+ return ret;
+}
+
+/*
+ * Device remove
+ */
+
+static int wbsd_remove(struct device* dev)
+{
+ struct mmc_host* mmc = dev_get_drvdata(dev);
+ struct wbsd_host* host;
+
+ if (!mmc)
+ return 0;
+
+ host = mmc_priv(mmc);
+
+ /*
+ * Unregister host with MMC layer.
+ */
+ mmc_remove_host(mmc);
+
+ /*
+ * Power down the SD/MMC function.
+ */
+ wbsd_unlock_config(host);
+ wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
+ wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
+ wbsd_lock_config(host);
+
+ /*
+ * Free resources.
+ */
+ if (host->dma_buffer)
+ kfree(host->dma_buffer);
+
+ if (host->dma >= 0)
+ free_dma(host->dma);
+
+ free_irq(host->irq, host);
+
+ tasklet_kill(&host->card_tasklet);
+ tasklet_kill(&host->fifo_tasklet);
+ tasklet_kill(&host->crc_tasklet);
+ tasklet_kill(&host->timeout_tasklet);
+ tasklet_kill(&host->finish_tasklet);
+ tasklet_kill(&host->block_tasklet);
+
+ wbsd_release_regions(host);
+
+ mmc_free_host(mmc);
+
+ return 0;
+}
+
+/*
+ * Power management
+ */
+
+#ifdef CONFIG_PM
+static int wbsd_suspend(struct device *dev, u32 state, u32 level)
+{
+ DBGF("Not yet supported\n");
+
+ return 0;
+}
+
+static int wbsd_resume(struct device *dev, u32 level)
+{
+ DBGF("Not yet supported\n");
+
+ return 0;
+}
+#else
+#define wbsd_suspend NULL
+#define wbsd_resume NULL
+#endif
+
+static void wbsd_release(struct device *dev)
+{
+}
+
+static struct platform_device wbsd_device = {
+ .name = DRIVER_NAME,
+ .id = -1,
+ .dev = {
+ .release = wbsd_release,
+ },
+};
+
+static struct device_driver wbsd_driver = {
+ .name = DRIVER_NAME,
+ .bus = &platform_bus_type,
+ .probe = wbsd_probe,
+ .remove = wbsd_remove,
+
+ .suspend = wbsd_suspend,
+ .resume = wbsd_resume,
+};
+
+/*
+ * Module loading/unloading
+ */
+
+static int __init wbsd_drv_init(void)
+{
+ int result;
+
+ printk(KERN_INFO DRIVER_NAME
+ ": Winbond W83L51xD SD/MMC card interface driver, "
+ DRIVER_VERSION "\n");
+ printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
+
+ result = driver_register(&wbsd_driver);
+ if (result < 0)
+ return result;
+
+ result = platform_device_register(&wbsd_device);
+ if (result < 0)
+ return result;
+
+ return 0;
+}
+
+static void __exit wbsd_drv_exit(void)
+{
+ platform_device_unregister(&wbsd_device);
+
+ driver_unregister(&wbsd_driver);
+
+ DBG("unloaded\n");
+}
+
+module_init(wbsd_drv_init);
+module_exit(wbsd_drv_exit);
+module_param(io, uint, 0444);
+module_param(irq, uint, 0444);
+module_param(dma, int, 0444);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
+
+MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
+MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
+MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");
projects / history.git / commitdiff