![Wolfram Sang](/assets/img/avatar_default.png)
A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014 lines
39 KiB
C
2014 lines
39 KiB
C
/*
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* linux/drivers/mmc/host/wbsd.c - Winbond W83L51xD SD/MMC driver
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*
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* Copyright (C) 2004-2007 Pierre Ossman, All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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*
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* Warning!
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*
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* Changes to the FIFO system should be done with extreme care since
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* the hardware is full of bugs related to the FIFO. Known issues are:
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*
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* - FIFO size field in FSR is always zero.
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*
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* - FIFO interrupts tend not to work as they should. Interrupts are
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* triggered only for full/empty events, not for threshold values.
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*
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* - On APIC systems the FIFO empty interrupt is sometimes lost.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include <linux/pnp.h>
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#include <linux/highmem.h>
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#include <linux/mmc/host.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include "wbsd.h"
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#define DRIVER_NAME "wbsd"
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#define DBG(x...) \
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pr_debug(DRIVER_NAME ": " x)
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#define DBGF(f, x...) \
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pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x)
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/*
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* Device resources
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*/
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#ifdef CONFIG_PNP
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static const struct pnp_device_id pnp_dev_table[] = {
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{ "WEC0517", 0 },
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{ "WEC0518", 0 },
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{ "", 0 },
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};
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MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
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#endif /* CONFIG_PNP */
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static const int config_ports[] = { 0x2E, 0x4E };
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static const int unlock_codes[] = { 0x83, 0x87 };
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static const int valid_ids[] = {
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0x7112,
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};
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#ifdef CONFIG_PNP
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static unsigned int param_nopnp = 0;
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#else
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static const unsigned int param_nopnp = 1;
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#endif
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static unsigned int param_io = 0x248;
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static unsigned int param_irq = 6;
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static int param_dma = 2;
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/*
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* Basic functions
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*/
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static inline void wbsd_unlock_config(struct wbsd_host *host)
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{
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BUG_ON(host->config == 0);
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outb(host->unlock_code, host->config);
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outb(host->unlock_code, host->config);
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}
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static inline void wbsd_lock_config(struct wbsd_host *host)
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{
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BUG_ON(host->config == 0);
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outb(LOCK_CODE, host->config);
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}
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static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value)
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{
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BUG_ON(host->config == 0);
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outb(reg, host->config);
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outb(value, host->config + 1);
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}
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static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg)
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{
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BUG_ON(host->config == 0);
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outb(reg, host->config);
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return inb(host->config + 1);
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}
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static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value)
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{
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outb(index, host->base + WBSD_IDXR);
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outb(value, host->base + WBSD_DATAR);
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}
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static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index)
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{
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outb(index, host->base + WBSD_IDXR);
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return inb(host->base + WBSD_DATAR);
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}
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/*
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* Common routines
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*/
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static void wbsd_init_device(struct wbsd_host *host)
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{
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u8 setup, ier;
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/*
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* Reset chip (SD/MMC part) and fifo.
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*/
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setup = wbsd_read_index(host, WBSD_IDX_SETUP);
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setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
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wbsd_write_index(host, WBSD_IDX_SETUP, setup);
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/*
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* Set DAT3 to input
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*/
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setup &= ~WBSD_DAT3_H;
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wbsd_write_index(host, WBSD_IDX_SETUP, setup);
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host->flags &= ~WBSD_FIGNORE_DETECT;
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/*
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* Read back default clock.
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*/
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host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
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/*
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* Power down port.
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*/
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outb(WBSD_POWER_N, host->base + WBSD_CSR);
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/*
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* Set maximum timeout.
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*/
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wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
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/*
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* Test for card presence
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*/
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if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
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host->flags |= WBSD_FCARD_PRESENT;
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else
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host->flags &= ~WBSD_FCARD_PRESENT;
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/*
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* Enable interesting interrupts.
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*/
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ier = 0;
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ier |= WBSD_EINT_CARD;
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ier |= WBSD_EINT_FIFO_THRE;
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ier |= WBSD_EINT_CRC;
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ier |= WBSD_EINT_TIMEOUT;
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ier |= WBSD_EINT_TC;
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outb(ier, host->base + WBSD_EIR);
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/*
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* Clear interrupts.
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*/
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inb(host->base + WBSD_ISR);
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}
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static void wbsd_reset(struct wbsd_host *host)
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{
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u8 setup;
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pr_err("%s: Resetting chip\n", mmc_hostname(host->mmc));
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/*
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* Soft reset of chip (SD/MMC part).
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*/
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setup = wbsd_read_index(host, WBSD_IDX_SETUP);
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setup |= WBSD_SOFT_RESET;
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wbsd_write_index(host, WBSD_IDX_SETUP, setup);
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}
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static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq)
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{
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unsigned long dmaflags;
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if (host->dma >= 0) {
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/*
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* Release ISA DMA controller.
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*/
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dmaflags = claim_dma_lock();
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disable_dma(host->dma);
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clear_dma_ff(host->dma);
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release_dma_lock(dmaflags);
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/*
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* Disable DMA on host.
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*/
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wbsd_write_index(host, WBSD_IDX_DMA, 0);
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}
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host->mrq = NULL;
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/*
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* MMC layer might call back into the driver so first unlock.
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*/
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spin_unlock(&host->lock);
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mmc_request_done(host->mmc, mrq);
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spin_lock(&host->lock);
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}
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/*
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* Scatter/gather functions
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*/
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static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data)
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{
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/*
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* Get info. about SG list from data structure.
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*/
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host->cur_sg = data->sg;
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host->num_sg = data->sg_len;
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host->offset = 0;
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host->remain = host->cur_sg->length;
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}
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static inline int wbsd_next_sg(struct wbsd_host *host)
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{
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/*
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* Skip to next SG entry.
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*/
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host->cur_sg++;
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host->num_sg--;
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/*
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* Any entries left?
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*/
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if (host->num_sg > 0) {
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host->offset = 0;
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host->remain = host->cur_sg->length;
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}
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return host->num_sg;
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}
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static inline char *wbsd_sg_to_buffer(struct wbsd_host *host)
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{
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return sg_virt(host->cur_sg);
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}
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static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
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{
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unsigned int len, i;
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struct scatterlist *sg;
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char *dmabuf = host->dma_buffer;
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char *sgbuf;
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sg = data->sg;
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len = data->sg_len;
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for (i = 0; i < len; i++) {
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sgbuf = sg_virt(&sg[i]);
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memcpy(dmabuf, sgbuf, sg[i].length);
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dmabuf += sg[i].length;
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}
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}
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static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)
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{
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unsigned int len, i;
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struct scatterlist *sg;
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char *dmabuf = host->dma_buffer;
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char *sgbuf;
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sg = data->sg;
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len = data->sg_len;
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for (i = 0; i < len; i++) {
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sgbuf = sg_virt(&sg[i]);
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memcpy(sgbuf, dmabuf, sg[i].length);
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dmabuf += sg[i].length;
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}
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}
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/*
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* Command handling
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*/
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static inline void wbsd_get_short_reply(struct wbsd_host *host,
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struct mmc_command *cmd)
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{
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/*
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* Correct response type?
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*/
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if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) {
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cmd->error = -EILSEQ;
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return;
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}
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cmd->resp[0] = wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
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cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
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cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
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cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
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cmd->resp[1] = wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
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}
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static inline void wbsd_get_long_reply(struct wbsd_host *host,
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struct mmc_command *cmd)
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{
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int i;
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/*
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* Correct response type?
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*/
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if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) {
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cmd->error = -EILSEQ;
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return;
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}
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for (i = 0; i < 4; i++) {
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cmd->resp[i] =
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wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
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cmd->resp[i] |=
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wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
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cmd->resp[i] |=
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wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
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cmd->resp[i] |=
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wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
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}
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}
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static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd)
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{
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int i;
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u8 status, isr;
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/*
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* Clear accumulated ISR. The interrupt routine
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* will fill this one with events that occur during
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* transfer.
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*/
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host->isr = 0;
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/*
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* Send the command (CRC calculated by host).
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*/
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outb(cmd->opcode, host->base + WBSD_CMDR);
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for (i = 3; i >= 0; i--)
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outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
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cmd->error = 0;
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/*
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* Wait for the request to complete.
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*/
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do {
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status = wbsd_read_index(host, WBSD_IDX_STATUS);
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} while (status & WBSD_CARDTRAFFIC);
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/*
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* Do we expect a reply?
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*/
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if (cmd->flags & MMC_RSP_PRESENT) {
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/*
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* Read back status.
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*/
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isr = host->isr;
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/* Card removed? */
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if (isr & WBSD_INT_CARD)
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cmd->error = -ENOMEDIUM;
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/* Timeout? */
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else if (isr & WBSD_INT_TIMEOUT)
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cmd->error = -ETIMEDOUT;
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/* CRC? */
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else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
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cmd->error = -EILSEQ;
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/* All ok */
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else {
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if (cmd->flags & MMC_RSP_136)
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wbsd_get_long_reply(host, cmd);
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else
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wbsd_get_short_reply(host, cmd);
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}
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}
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}
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/*
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* Data functions
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*/
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static void wbsd_empty_fifo(struct wbsd_host *host)
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{
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struct mmc_data *data = host->mrq->cmd->data;
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char *buffer;
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int i, fsr, fifo;
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/*
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* Handle excessive data.
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*/
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if (host->num_sg == 0)
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return;
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buffer = wbsd_sg_to_buffer(host) + host->offset;
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/*
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* Drain the fifo. This has a tendency to loop longer
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* than the FIFO length (usually one block).
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*/
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while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) {
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/*
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* The size field in the FSR is broken so we have to
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* do some guessing.
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*/
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if (fsr & WBSD_FIFO_FULL)
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fifo = 16;
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else if (fsr & WBSD_FIFO_FUTHRE)
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fifo = 8;
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else
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fifo = 1;
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for (i = 0; i < fifo; i++) {
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*buffer = inb(host->base + WBSD_DFR);
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buffer++;
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host->offset++;
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host->remain--;
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data->bytes_xfered++;
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/*
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* End of scatter list entry?
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*/
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if (host->remain == 0) {
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/*
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* Get next entry. Check if last.
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*/
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if (!wbsd_next_sg(host))
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return;
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buffer = wbsd_sg_to_buffer(host);
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}
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}
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}
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/*
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* This is a very dirty hack to solve a
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* hardware problem. The chip doesn't trigger
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* FIFO threshold interrupts properly.
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*/
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if ((data->blocks * data->blksz - data->bytes_xfered) < 16)
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tasklet_schedule(&host->fifo_tasklet);
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}
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static void wbsd_fill_fifo(struct wbsd_host *host)
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{
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struct mmc_data *data = host->mrq->cmd->data;
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char *buffer;
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int i, fsr, fifo;
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/*
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* Check that we aren't being called after the
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* entire buffer has been transferred.
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*/
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if (host->num_sg == 0)
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return;
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buffer = wbsd_sg_to_buffer(host) + host->offset;
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/*
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* Fill the fifo. This has a tendency to loop longer
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* than the FIFO length (usually one block).
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*/
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while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) {
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/*
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* The size field in the FSR is broken so we have to
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* do some guessing.
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*/
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if (fsr & WBSD_FIFO_EMPTY)
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fifo = 0;
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else if (fsr & WBSD_FIFO_EMTHRE)
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fifo = 8;
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else
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fifo = 15;
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for (i = 16; i > fifo; i--) {
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outb(*buffer, host->base + WBSD_DFR);
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buffer++;
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host->offset++;
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host->remain--;
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data->bytes_xfered++;
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/*
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* End of scatter list entry?
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*/
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if (host->remain == 0) {
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/*
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* Get next entry. Check if last.
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*/
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if (!wbsd_next_sg(host))
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return;
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buffer = wbsd_sg_to_buffer(host);
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}
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}
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}
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/*
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* The controller stops sending interrupts for
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* 'FIFO empty' under certain conditions. So we
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* need to be a bit more pro-active.
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*/
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tasklet_schedule(&host->fifo_tasklet);
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}
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static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data)
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{
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u16 blksize;
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u8 setup;
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unsigned long dmaflags;
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unsigned int size;
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/*
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* Calculate size.
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*/
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size = data->blocks * data->blksz;
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/*
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* Check timeout values for overflow.
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* (Yes, some cards cause this value to overflow).
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*/
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if (data->timeout_ns > 127000000)
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wbsd_write_index(host, WBSD_IDX_TAAC, 127);
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else {
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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.
|
|
* Two bytes are needed for each data line.
|
|
*/
|
|
if (host->bus_width == MMC_BUS_WIDTH_1) {
|
|
blksize = data->blksz + 2;
|
|
|
|
wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
|
|
wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
|
|
} else if (host->bus_width == MMC_BUS_WIDTH_4) {
|
|
blksize = data->blksz + 2 * 4;
|
|
|
|
wbsd_write_index(host, WBSD_IDX_PBSMSB,
|
|
((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH);
|
|
wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
|
|
} else {
|
|
data->error = -EINVAL;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* 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(size > 0x10000);
|
|
if (size > 0x10000) {
|
|
data->error = -EINVAL;
|
|
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 & ~0x40);
|
|
else
|
|
set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
|
|
set_dma_addr(host->dma, host->dma_addr);
|
|
set_dma_count(host->dma, size);
|
|
|
|
enable_dma(host->dma);
|
|
release_dma_lock(dmaflags);
|
|
|
|
/*
|
|
* Enable DMA on the host.
|
|
*/
|
|
wbsd_write_index(host, WBSD_IDX_DMA, 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 = 0;
|
|
}
|
|
|
|
static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data)
|
|
{
|
|
unsigned long dmaflags;
|
|
int count;
|
|
u8 status;
|
|
|
|
WARN_ON(host->mrq == NULL);
|
|
|
|
/*
|
|
* Send a stop command if needed.
|
|
*/
|
|
if (data->stop)
|
|
wbsd_send_command(host, data->stop);
|
|
|
|
/*
|
|
* Wait for the controller to leave data
|
|
* transfer state.
|
|
*/
|
|
do {
|
|
status = wbsd_read_index(host, WBSD_IDX_STATUS);
|
|
} while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
|
|
|
|
/*
|
|
* 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);
|
|
|
|
data->bytes_xfered = host->mrq->data->blocks *
|
|
host->mrq->data->blksz - count;
|
|
data->bytes_xfered -= data->bytes_xfered % data->blksz;
|
|
|
|
/*
|
|
* Any leftover data?
|
|
*/
|
|
if (count) {
|
|
pr_err("%s: Incomplete DMA transfer. "
|
|
"%d bytes left.\n",
|
|
mmc_hostname(host->mmc), count);
|
|
|
|
if (!data->error)
|
|
data->error = -EIO;
|
|
} else {
|
|
/*
|
|
* Transfer data from DMA buffer to
|
|
* SG list.
|
|
*/
|
|
if (data->flags & MMC_DATA_READ)
|
|
wbsd_dma_to_sg(host, data);
|
|
}
|
|
|
|
if (data->error) {
|
|
if (data->bytes_xfered)
|
|
data->bytes_xfered -= data->blksz;
|
|
}
|
|
}
|
|
|
|
wbsd_request_end(host, host->mrq);
|
|
}
|
|
|
|
/*****************************************************************************\
|
|
* *
|
|
* MMC layer 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;
|
|
|
|
/*
|
|
* Check that there is actually a card in the slot.
|
|
*/
|
|
if (!(host->flags & WBSD_FCARD_PRESENT)) {
|
|
cmd->error = -ENOMEDIUM;
|
|
goto done;
|
|
}
|
|
|
|
if (cmd->data) {
|
|
/*
|
|
* The hardware is so delightfully stupid that it has a list
|
|
* of "data" commands. If a command isn't on this list, it'll
|
|
* just go back to the idle state and won't send any data
|
|
* interrupts.
|
|
*/
|
|
switch (cmd->opcode) {
|
|
case 11:
|
|
case 17:
|
|
case 18:
|
|
case 20:
|
|
case 24:
|
|
case 25:
|
|
case 26:
|
|
case 27:
|
|
case 30:
|
|
case 42:
|
|
case 56:
|
|
break;
|
|
|
|
/* ACMDs. We don't keep track of state, so we just treat them
|
|
* like any other command. */
|
|
case 51:
|
|
break;
|
|
|
|
default:
|
|
#ifdef CONFIG_MMC_DEBUG
|
|
pr_warn("%s: Data command %d is not supported by this controller\n",
|
|
mmc_hostname(host->mmc), cmd->opcode);
|
|
#endif
|
|
cmd->error = -EINVAL;
|
|
|
|
goto done;
|
|
};
|
|
}
|
|
|
|
/*
|
|
* Does the request include data?
|
|
*/
|
|
if (cmd->data) {
|
|
wbsd_prepare_data(host, cmd->data);
|
|
|
|
if (cmd->data->error)
|
|
goto done;
|
|
}
|
|
|
|
wbsd_send_command(host, cmd);
|
|
|
|
/*
|
|
* If this is a data transfer the request
|
|
* will be finished after the data has
|
|
* transferred.
|
|
*/
|
|
if (cmd->data && !cmd->error) {
|
|
/*
|
|
* Dirty fix for hardware bug.
|
|
*/
|
|
if (host->dma == -1)
|
|
tasklet_schedule(&host->fifo_tasklet);
|
|
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Power up card.
|
|
*/
|
|
if (ios->power_mode != MMC_POWER_OFF) {
|
|
pwr = inb(host->base + WBSD_CSR);
|
|
pwr &= ~WBSD_POWER_N;
|
|
outb(pwr, host->base + WBSD_CSR);
|
|
}
|
|
|
|
/*
|
|
* MMC cards need to have pin 1 high during init.
|
|
* It wreaks havoc with the card detection though so
|
|
* that needs to be disabled.
|
|
*/
|
|
setup = wbsd_read_index(host, WBSD_IDX_SETUP);
|
|
if (ios->chip_select == MMC_CS_HIGH) {
|
|
BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
|
|
setup |= WBSD_DAT3_H;
|
|
host->flags |= WBSD_FIGNORE_DETECT;
|
|
} else {
|
|
if (setup & WBSD_DAT3_H) {
|
|
setup &= ~WBSD_DAT3_H;
|
|
|
|
/*
|
|
* We cannot resume card detection immediately
|
|
* because of capacitance and delays in the chip.
|
|
*/
|
|
mod_timer(&host->ignore_timer, jiffies + HZ / 100);
|
|
}
|
|
}
|
|
wbsd_write_index(host, WBSD_IDX_SETUP, setup);
|
|
|
|
/*
|
|
* Store bus width for later. Will be used when
|
|
* setting up the data transfer.
|
|
*/
|
|
host->bus_width = ios->bus_width;
|
|
|
|
spin_unlock_bh(&host->lock);
|
|
}
|
|
|
|
static int wbsd_get_ro(struct mmc_host *mmc)
|
|
{
|
|
struct wbsd_host *host = mmc_priv(mmc);
|
|
u8 csr;
|
|
|
|
spin_lock_bh(&host->lock);
|
|
|
|
csr = inb(host->base + WBSD_CSR);
|
|
csr |= WBSD_MSLED;
|
|
outb(csr, host->base + WBSD_CSR);
|
|
|
|
mdelay(1);
|
|
|
|
csr = inb(host->base + WBSD_CSR);
|
|
csr &= ~WBSD_MSLED;
|
|
outb(csr, host->base + WBSD_CSR);
|
|
|
|
spin_unlock_bh(&host->lock);
|
|
|
|
return !!(csr & WBSD_WRPT);
|
|
}
|
|
|
|
static const struct mmc_host_ops wbsd_ops = {
|
|
.request = wbsd_request,
|
|
.set_ios = wbsd_set_ios,
|
|
.get_ro = wbsd_get_ro,
|
|
};
|
|
|
|
/*****************************************************************************\
|
|
* *
|
|
* Interrupt handling *
|
|
* *
|
|
\*****************************************************************************/
|
|
|
|
/*
|
|
* Helper function to reset detection ignore
|
|
*/
|
|
|
|
static void wbsd_reset_ignore(unsigned long data)
|
|
{
|
|
struct wbsd_host *host = (struct wbsd_host *)data;
|
|
|
|
BUG_ON(host == NULL);
|
|
|
|
DBG("Resetting card detection ignore\n");
|
|
|
|
spin_lock_bh(&host->lock);
|
|
|
|
host->flags &= ~WBSD_FIGNORE_DETECT;
|
|
|
|
/*
|
|
* Card status might have changed during the
|
|
* blackout.
|
|
*/
|
|
tasklet_schedule(&host->card_tasklet);
|
|
|
|
spin_unlock_bh(&host->lock);
|
|
}
|
|
|
|
/*
|
|
* Tasklets
|
|
*/
|
|
|
|
static inline 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;
|
|
int delay = -1;
|
|
|
|
spin_lock(&host->lock);
|
|
|
|
if (host->flags & WBSD_FIGNORE_DETECT) {
|
|
spin_unlock(&host->lock);
|
|
return;
|
|
}
|
|
|
|
csr = inb(host->base + WBSD_CSR);
|
|
WARN_ON(csr == 0xff);
|
|
|
|
if (csr & WBSD_CARDPRESENT) {
|
|
if (!(host->flags & WBSD_FCARD_PRESENT)) {
|
|
DBG("Card inserted\n");
|
|
host->flags |= WBSD_FCARD_PRESENT;
|
|
|
|
delay = 500;
|
|
}
|
|
} else if (host->flags & WBSD_FCARD_PRESENT) {
|
|
DBG("Card removed\n");
|
|
host->flags &= ~WBSD_FCARD_PRESENT;
|
|
|
|
if (host->mrq) {
|
|
pr_err("%s: Card removed during transfer!\n",
|
|
mmc_hostname(host->mmc));
|
|
wbsd_reset(host);
|
|
|
|
host->mrq->cmd->error = -ENOMEDIUM;
|
|
tasklet_schedule(&host->finish_tasklet);
|
|
}
|
|
|
|
delay = 0;
|
|
}
|
|
|
|
/*
|
|
* Unlock first since we might get a call back.
|
|
*/
|
|
|
|
spin_unlock(&host->lock);
|
|
|
|
if (delay != -1)
|
|
mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
|
|
}
|
|
|
|
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->num_sg == 0) {
|
|
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);
|
|
|
|
if (!host->mrq)
|
|
goto end;
|
|
|
|
data = wbsd_get_data(host);
|
|
if (!data)
|
|
goto end;
|
|
|
|
DBGF("CRC error\n");
|
|
|
|
data->error = -EILSEQ;
|
|
|
|
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);
|
|
|
|
if (!host->mrq)
|
|
goto end;
|
|
|
|
data = wbsd_get_data(host);
|
|
if (!data)
|
|
goto end;
|
|
|
|
DBGF("Timeout\n");
|
|
|
|
data->error = -ETIMEDOUT;
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Interrupt handling
|
|
*/
|
|
|
|
static irqreturn_t wbsd_irq(int irq, void *dev_id)
|
|
{
|
|
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;
|
|
|
|
host->isr |= isr;
|
|
|
|
/*
|
|
* Schedule tasklets as needed.
|
|
*/
|
|
if (isr & WBSD_INT_CARD)
|
|
tasklet_schedule(&host->card_tasklet);
|
|
if (isr & WBSD_INT_FIFO_THRE)
|
|
tasklet_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_TC)
|
|
tasklet_schedule(&host->finish_tasklet);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*****************************************************************************\
|
|
* *
|
|
* Device initialisation and shutdown *
|
|
* *
|
|
\*****************************************************************************/
|
|
|
|
/*
|
|
* Allocate/free MMC structure.
|
|
*/
|
|
|
|
static int wbsd_alloc_mmc(struct device *dev)
|
|
{
|
|
struct mmc_host *mmc;
|
|
struct wbsd_host *host;
|
|
|
|
/*
|
|
* Allocate MMC structure.
|
|
*/
|
|
mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
|
|
if (!mmc)
|
|
return -ENOMEM;
|
|
|
|
host = mmc_priv(mmc);
|
|
host->mmc = mmc;
|
|
|
|
host->dma = -1;
|
|
|
|
/*
|
|
* 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;
|
|
mmc->caps = MMC_CAP_4_BIT_DATA;
|
|
|
|
spin_lock_init(&host->lock);
|
|
|
|
/*
|
|
* Set up timers
|
|
*/
|
|
init_timer(&host->ignore_timer);
|
|
host->ignore_timer.data = (unsigned long)host;
|
|
host->ignore_timer.function = wbsd_reset_ignore;
|
|
|
|
/*
|
|
* Maximum number of segments. Worst case is one sector per segment
|
|
* so this will be 64kB/512.
|
|
*/
|
|
mmc->max_segs = 128;
|
|
|
|
/*
|
|
* Maximum request size. Also limited by 64KiB buffer.
|
|
*/
|
|
mmc->max_req_size = 65536;
|
|
|
|
/*
|
|
* Maximum segment size. Could be one segment with the maximum number
|
|
* of bytes.
|
|
*/
|
|
mmc->max_seg_size = mmc->max_req_size;
|
|
|
|
/*
|
|
* Maximum block size. We have 12 bits (= 4095) but have to subtract
|
|
* space for CRC. So the maximum is 4095 - 4*2 = 4087.
|
|
*/
|
|
mmc->max_blk_size = 4087;
|
|
|
|
/*
|
|
* Maximum block count. There is no real limit so the maximum
|
|
* request size will be the only restriction.
|
|
*/
|
|
mmc->max_blk_count = mmc->max_req_size;
|
|
|
|
dev_set_drvdata(dev, mmc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void wbsd_free_mmc(struct device *dev)
|
|
{
|
|
struct mmc_host *mmc;
|
|
struct wbsd_host *host;
|
|
|
|
mmc = dev_get_drvdata(dev);
|
|
if (!mmc)
|
|
return;
|
|
|
|
host = mmc_priv(mmc);
|
|
BUG_ON(host == NULL);
|
|
|
|
del_timer_sync(&host->ignore_timer);
|
|
|
|
mmc_free_host(mmc);
|
|
|
|
dev_set_drvdata(dev, NULL);
|
|
}
|
|
|
|
/*
|
|
* Scan for known chip id:s
|
|
*/
|
|
|
|
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 < ARRAY_SIZE(config_ports); i++) {
|
|
if (!request_region(config_ports[i], 2, DRIVER_NAME))
|
|
continue;
|
|
|
|
for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
|
|
id = 0xFFFF;
|
|
|
|
host->config = config_ports[i];
|
|
host->unlock_code = unlock_codes[j];
|
|
|
|
wbsd_unlock_config(host);
|
|
|
|
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);
|
|
|
|
wbsd_lock_config(host);
|
|
|
|
for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
|
|
if (id == valid_ids[k]) {
|
|
host->chip_id = id;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (id != 0xFFFF) {
|
|
DBG("Unknown hardware (id %x) found at %x\n",
|
|
id, config_ports[i]);
|
|
}
|
|
}
|
|
|
|
release_region(config_ports[i], 2);
|
|
}
|
|
|
|
host->config = 0;
|
|
host->unlock_code = 0;
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* Allocate/free io port ranges
|
|
*/
|
|
|
|
static int wbsd_request_region(struct wbsd_host *host, int base)
|
|
{
|
|
if (base & 0x7)
|
|
return -EINVAL;
|
|
|
|
if (!request_region(base, 8, DRIVER_NAME))
|
|
return -EIO;
|
|
|
|
host->base = base;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void wbsd_release_regions(struct wbsd_host *host)
|
|
{
|
|
if (host->base)
|
|
release_region(host->base, 8);
|
|
|
|
host->base = 0;
|
|
|
|
if (host->config)
|
|
release_region(host->config, 2);
|
|
|
|
host->config = 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate/free DMA port and buffer
|
|
*/
|
|
|
|
static void wbsd_request_dma(struct wbsd_host *host, int dma)
|
|
{
|
|
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(WBSD_DMA_SIZE,
|
|
GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
|
|
if (!host->dma_buffer)
|
|
goto free;
|
|
|
|
/*
|
|
* Translate the address to a physical address.
|
|
*/
|
|
host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
|
|
WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
|
|
WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
|
|
host->dma_addr = 0;
|
|
|
|
kfree(host->dma_buffer);
|
|
host->dma_buffer = NULL;
|
|
|
|
free:
|
|
free_dma(dma);
|
|
|
|
err:
|
|
pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n",
|
|
dma);
|
|
}
|
|
|
|
static void wbsd_release_dma(struct wbsd_host *host)
|
|
{
|
|
if (host->dma_addr) {
|
|
dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
|
|
WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
|
|
}
|
|
kfree(host->dma_buffer);
|
|
if (host->dma >= 0)
|
|
free_dma(host->dma);
|
|
|
|
host->dma = -1;
|
|
host->dma_buffer = NULL;
|
|
host->dma_addr = 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate/free IRQ.
|
|
*/
|
|
|
|
static int wbsd_request_irq(struct wbsd_host *host, int irq)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Set up tasklets. Must be done before requesting interrupt.
|
|
*/
|
|
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);
|
|
|
|
/*
|
|
* Allocate interrupt.
|
|
*/
|
|
ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
|
|
if (ret)
|
|
return ret;
|
|
|
|
host->irq = irq;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void wbsd_release_irq(struct wbsd_host *host)
|
|
{
|
|
if (!host->irq)
|
|
return;
|
|
|
|
free_irq(host->irq, host);
|
|
|
|
host->irq = 0;
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Allocate all resources for the host.
|
|
*/
|
|
|
|
static int wbsd_request_resources(struct wbsd_host *host,
|
|
int base, int irq, int dma)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Allocate I/O ports.
|
|
*/
|
|
ret = wbsd_request_region(host, base);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Allocate interrupt.
|
|
*/
|
|
ret = wbsd_request_irq(host, irq);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Allocate DMA.
|
|
*/
|
|
wbsd_request_dma(host, dma);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Release all resources for the host.
|
|
*/
|
|
|
|
static void wbsd_release_resources(struct wbsd_host *host)
|
|
{
|
|
wbsd_release_dma(host);
|
|
wbsd_release_irq(host);
|
|
wbsd_release_regions(host);
|
|
}
|
|
|
|
/*
|
|
* Configure the resources the chip should use.
|
|
*/
|
|
|
|
static void wbsd_chip_config(struct wbsd_host *host)
|
|
{
|
|
wbsd_unlock_config(host);
|
|
|
|
/*
|
|
* Reset the chip.
|
|
*/
|
|
wbsd_write_config(host, WBSD_CONF_SWRST, 1);
|
|
wbsd_write_config(host, WBSD_CONF_SWRST, 0);
|
|
|
|
/*
|
|
* Select SD/MMC function.
|
|
*/
|
|
wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
|
|
|
|
/*
|
|
* Set up card detection.
|
|
*/
|
|
wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
|
|
|
|
/*
|
|
* Configure chip
|
|
*/
|
|
wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
|
|
wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
|
|
|
|
wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
|
|
|
|
if (host->dma >= 0)
|
|
wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
|
|
|
|
/*
|
|
* Enable and power up chip.
|
|
*/
|
|
wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
|
|
wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
|
|
|
|
wbsd_lock_config(host);
|
|
}
|
|
|
|
/*
|
|
* Check that configured resources are correct.
|
|
*/
|
|
|
|
static int wbsd_chip_validate(struct wbsd_host *host)
|
|
{
|
|
int base, irq, dma;
|
|
|
|
wbsd_unlock_config(host);
|
|
|
|
/*
|
|
* Select SD/MMC function.
|
|
*/
|
|
wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
|
|
|
|
/*
|
|
* Read configuration.
|
|
*/
|
|
base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
|
|
base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
|
|
|
|
irq = wbsd_read_config(host, WBSD_CONF_IRQ);
|
|
|
|
dma = wbsd_read_config(host, WBSD_CONF_DRQ);
|
|
|
|
wbsd_lock_config(host);
|
|
|
|
/*
|
|
* Validate against given configuration.
|
|
*/
|
|
if (base != host->base)
|
|
return 0;
|
|
if (irq != host->irq)
|
|
return 0;
|
|
if ((dma != host->dma) && (host->dma != -1))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Powers down the SD function
|
|
*/
|
|
|
|
static void wbsd_chip_poweroff(struct wbsd_host *host)
|
|
{
|
|
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);
|
|
}
|
|
|
|
/*****************************************************************************\
|
|
* *
|
|
* Devices setup and shutdown *
|
|
* *
|
|
\*****************************************************************************/
|
|
|
|
static int wbsd_init(struct device *dev, int base, int irq, int dma,
|
|
int pnp)
|
|
{
|
|
struct wbsd_host *host = NULL;
|
|
struct mmc_host *mmc = NULL;
|
|
int ret;
|
|
|
|
ret = wbsd_alloc_mmc(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mmc = dev_get_drvdata(dev);
|
|
host = mmc_priv(mmc);
|
|
|
|
/*
|
|
* Scan for hardware.
|
|
*/
|
|
ret = wbsd_scan(host);
|
|
if (ret) {
|
|
if (pnp && (ret == -ENODEV)) {
|
|
pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may experience lock-ups\n");
|
|
} else {
|
|
wbsd_free_mmc(dev);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Request resources.
|
|
*/
|
|
ret = wbsd_request_resources(host, base, irq, dma);
|
|
if (ret) {
|
|
wbsd_release_resources(host);
|
|
wbsd_free_mmc(dev);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* See if chip needs to be configured.
|
|
*/
|
|
if (pnp) {
|
|
if ((host->config != 0) && !wbsd_chip_validate(host)) {
|
|
pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
|
|
wbsd_chip_config(host);
|
|
}
|
|
} else
|
|
wbsd_chip_config(host);
|
|
|
|
/*
|
|
* Power Management stuff. No idea how this works.
|
|
* Not tested.
|
|
*/
|
|
#ifdef CONFIG_PM
|
|
if (host->config) {
|
|
wbsd_unlock_config(host);
|
|
wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
|
|
wbsd_lock_config(host);
|
|
}
|
|
#endif
|
|
/*
|
|
* Allow device to initialise itself properly.
|
|
*/
|
|
mdelay(5);
|
|
|
|
/*
|
|
* Reset the chip into a known state.
|
|
*/
|
|
wbsd_init_device(host);
|
|
|
|
mmc_add_host(mmc);
|
|
|
|
pr_info("%s: W83L51xD", mmc_hostname(mmc));
|
|
if (host->chip_id != 0)
|
|
printk(" id %x", (int)host->chip_id);
|
|
printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
|
|
if (host->dma >= 0)
|
|
printk(" dma %d", (int)host->dma);
|
|
else
|
|
printk(" FIFO");
|
|
if (pnp)
|
|
printk(" PnP");
|
|
printk("\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void wbsd_shutdown(struct device *dev, int pnp)
|
|
{
|
|
struct mmc_host *mmc = dev_get_drvdata(dev);
|
|
struct wbsd_host *host;
|
|
|
|
if (!mmc)
|
|
return;
|
|
|
|
host = mmc_priv(mmc);
|
|
|
|
mmc_remove_host(mmc);
|
|
|
|
/*
|
|
* Power down the SD/MMC function.
|
|
*/
|
|
if (!pnp)
|
|
wbsd_chip_poweroff(host);
|
|
|
|
wbsd_release_resources(host);
|
|
|
|
wbsd_free_mmc(dev);
|
|
}
|
|
|
|
/*
|
|
* Non-PnP
|
|
*/
|
|
|
|
static int wbsd_probe(struct platform_device *dev)
|
|
{
|
|
/* Use the module parameters for resources */
|
|
return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0);
|
|
}
|
|
|
|
static int wbsd_remove(struct platform_device *dev)
|
|
{
|
|
wbsd_shutdown(&dev->dev, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* PnP
|
|
*/
|
|
|
|
#ifdef CONFIG_PNP
|
|
|
|
static int
|
|
wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
|
|
{
|
|
int io, irq, dma;
|
|
|
|
/*
|
|
* Get resources from PnP layer.
|
|
*/
|
|
io = pnp_port_start(pnpdev, 0);
|
|
irq = pnp_irq(pnpdev, 0);
|
|
if (pnp_dma_valid(pnpdev, 0))
|
|
dma = pnp_dma(pnpdev, 0);
|
|
else
|
|
dma = -1;
|
|
|
|
DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
|
|
|
|
return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
|
|
}
|
|
|
|
static void wbsd_pnp_remove(struct pnp_dev *dev)
|
|
{
|
|
wbsd_shutdown(&dev->dev, 1);
|
|
}
|
|
|
|
#endif /* CONFIG_PNP */
|
|
|
|
/*
|
|
* Power management
|
|
*/
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int wbsd_platform_suspend(struct platform_device *dev,
|
|
pm_message_t state)
|
|
{
|
|
struct mmc_host *mmc = platform_get_drvdata(dev);
|
|
struct wbsd_host *host;
|
|
|
|
if (mmc == NULL)
|
|
return 0;
|
|
|
|
DBGF("Suspending...\n");
|
|
|
|
host = mmc_priv(mmc);
|
|
|
|
wbsd_chip_poweroff(host);
|
|
return 0;
|
|
}
|
|
|
|
static int wbsd_platform_resume(struct platform_device *dev)
|
|
{
|
|
struct mmc_host *mmc = platform_get_drvdata(dev);
|
|
struct wbsd_host *host;
|
|
|
|
if (mmc == NULL)
|
|
return 0;
|
|
|
|
DBGF("Resuming...\n");
|
|
|
|
host = mmc_priv(mmc);
|
|
|
|
wbsd_chip_config(host);
|
|
|
|
/*
|
|
* Allow device to initialise itself properly.
|
|
*/
|
|
mdelay(5);
|
|
|
|
wbsd_init_device(host);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PNP
|
|
|
|
static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
|
|
{
|
|
struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
|
|
|
|
if (mmc == NULL)
|
|
return 0;
|
|
|
|
DBGF("Suspending...\n");
|
|
return 0;
|
|
}
|
|
|
|
static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
|
|
{
|
|
struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
|
|
struct wbsd_host *host;
|
|
|
|
if (mmc == NULL)
|
|
return 0;
|
|
|
|
DBGF("Resuming...\n");
|
|
|
|
host = mmc_priv(mmc);
|
|
|
|
/*
|
|
* See if chip needs to be configured.
|
|
*/
|
|
if (host->config != 0) {
|
|
if (!wbsd_chip_validate(host)) {
|
|
pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
|
|
wbsd_chip_config(host);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allow device to initialise itself properly.
|
|
*/
|
|
mdelay(5);
|
|
|
|
wbsd_init_device(host);
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_PNP */
|
|
|
|
#else /* CONFIG_PM */
|
|
|
|
#define wbsd_platform_suspend NULL
|
|
#define wbsd_platform_resume NULL
|
|
|
|
#define wbsd_pnp_suspend NULL
|
|
#define wbsd_pnp_resume NULL
|
|
|
|
#endif /* CONFIG_PM */
|
|
|
|
static struct platform_device *wbsd_device;
|
|
|
|
static struct platform_driver wbsd_driver = {
|
|
.probe = wbsd_probe,
|
|
.remove = wbsd_remove,
|
|
|
|
.suspend = wbsd_platform_suspend,
|
|
.resume = wbsd_platform_resume,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
},
|
|
};
|
|
|
|
#ifdef CONFIG_PNP
|
|
|
|
static struct pnp_driver wbsd_pnp_driver = {
|
|
.name = DRIVER_NAME,
|
|
.id_table = pnp_dev_table,
|
|
.probe = wbsd_pnp_probe,
|
|
.remove = wbsd_pnp_remove,
|
|
|
|
.suspend = wbsd_pnp_suspend,
|
|
.resume = wbsd_pnp_resume,
|
|
};
|
|
|
|
#endif /* CONFIG_PNP */
|
|
|
|
/*
|
|
* Module loading/unloading
|
|
*/
|
|
|
|
static int __init wbsd_drv_init(void)
|
|
{
|
|
int result;
|
|
|
|
pr_info(DRIVER_NAME
|
|
": Winbond W83L51xD SD/MMC card interface driver\n");
|
|
pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
|
|
|
|
#ifdef CONFIG_PNP
|
|
|
|
if (!param_nopnp) {
|
|
result = pnp_register_driver(&wbsd_pnp_driver);
|
|
if (result < 0)
|
|
return result;
|
|
}
|
|
#endif /* CONFIG_PNP */
|
|
|
|
if (param_nopnp) {
|
|
result = platform_driver_register(&wbsd_driver);
|
|
if (result < 0)
|
|
return result;
|
|
|
|
wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
|
|
if (!wbsd_device) {
|
|
platform_driver_unregister(&wbsd_driver);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
result = platform_device_add(wbsd_device);
|
|
if (result) {
|
|
platform_device_put(wbsd_device);
|
|
platform_driver_unregister(&wbsd_driver);
|
|
return result;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit wbsd_drv_exit(void)
|
|
{
|
|
#ifdef CONFIG_PNP
|
|
|
|
if (!param_nopnp)
|
|
pnp_unregister_driver(&wbsd_pnp_driver);
|
|
|
|
#endif /* CONFIG_PNP */
|
|
|
|
if (param_nopnp) {
|
|
platform_device_unregister(wbsd_device);
|
|
|
|
platform_driver_unregister(&wbsd_driver);
|
|
}
|
|
|
|
DBG("unloaded\n");
|
|
}
|
|
|
|
module_init(wbsd_drv_init);
|
|
module_exit(wbsd_drv_exit);
|
|
#ifdef CONFIG_PNP
|
|
module_param_named(nopnp, param_nopnp, uint, 0444);
|
|
#endif
|
|
module_param_named(io, param_io, uint, 0444);
|
|
module_param_named(irq, param_irq, uint, 0444);
|
|
module_param_named(dma, param_dma, int, 0444);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
|
|
MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
|
|
|
|
#ifdef CONFIG_PNP
|
|
MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
|
|
#endif
|
|
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)");
|