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992 lines
25 KiB
C
992 lines
25 KiB
C
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/*
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* linux/drivers/mmc/host/glamo-mmc.c - Glamo MMC driver
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*
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* Copyright (C) 2007 Openmoko, Inc, Andy Green <andy@openmoko.com>
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* Based on S3C MMC driver that was:
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* Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk@maintech.de>
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/mmc/mmc.h>
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#include <linux/mmc/sd.h>
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#include <linux/mmc/host.h>
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#include <linux/platform_device.h>
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#include <linux/irq.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/crc7.h>
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#include <linux/scatterlist.h>
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#include <linux/io.h>
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#include <linux/regulator/consumer.h>
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#include <linux/mfd/glamo.h>
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#include "glamo-core.h"
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#include "glamo-regs.h"
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#define DRIVER_NAME "glamo-mci"
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struct glamo_mci_host {
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struct glamo_mmc_platform_data *pdata;
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struct platform_device *pdev;
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struct glamo_core *core;
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struct mmc_host *mmc;
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struct resource *mmio_mem;
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struct resource *data_mem;
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void __iomem *mmio_base;
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u16 __iomem *data_base;
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unsigned int irq;
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struct regulator *regulator;
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struct mmc_request *mrq;
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unsigned int clk_rate;
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unsigned short vdd;
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char power_mode;
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unsigned char request_counter;
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struct timer_list disable_timer;
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struct work_struct irq_work;
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struct work_struct read_work;
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unsigned clk_enabled : 1;
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};
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static void glamo_mci_send_request(struct mmc_host *mmc, struct mmc_request* mrq);
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static void glamo_mci_send_command(struct glamo_mci_host *host,
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struct mmc_command *cmd);
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/*
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* Max SD clock rate
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*
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* held at /(3 + 1) due to concerns of 100R recommended series resistor
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* allows 16MHz @ 4-bit --> 8MBytes/sec raw
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*
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* you can override this on kernel commandline using
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*
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* glamo_mci.sd_max_clk=10000000
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*
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* for example
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*/
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static int sd_max_clk = 21000000;
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module_param(sd_max_clk, int, 0644);
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/*
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* Slow SD clock rate
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*
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* you can override this on kernel commandline using
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*
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* glamo_mci.sd_slow_ratio=8
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*
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* for example
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*
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* platform callback is used to decide effective clock rate, if not
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* defined then max is used, if defined and returns nonzero, rate is
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* divided by this factor
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*/
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static int sd_slow_ratio = 8;
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module_param(sd_slow_ratio, int, 0644);
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/*
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* Post-power SD clock rate
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*
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* you can override this on kernel commandline using
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*
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* glamo_mci.sd_post_power_clock=1000000
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*
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* for example
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*
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* After changing power to card, clock is held at this rate until first bulk
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* transfer completes
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*/
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static int sd_post_power_clock = 1000000;
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module_param(sd_post_power_clock, int, 0644);
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static inline void glamo_reg_write(struct glamo_mci_host *glamo,
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u_int16_t reg, u_int16_t val)
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{
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writew(val, glamo->mmio_base + reg);
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}
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static inline u_int16_t glamo_reg_read(struct glamo_mci_host *glamo,
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u_int16_t reg)
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{
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return readw(glamo->mmio_base + reg);
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}
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static void glamo_reg_set_bit_mask(struct glamo_mci_host *glamo,
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u_int16_t reg, u_int16_t mask,
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u_int16_t val)
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{
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u_int16_t tmp;
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val &= mask;
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tmp = glamo_reg_read(glamo, reg);
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tmp &= ~mask;
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tmp |= val;
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glamo_reg_write(glamo, reg, tmp);
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}
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static void glamo_mci_clock_disable(struct glamo_mci_host *host) {
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if (host->clk_enabled) {
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glamo_engine_suspend(host->core, GLAMO_ENGINE_MMC);
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host->clk_enabled = 0;
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}
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}
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static void glamo_mci_clock_enable(struct glamo_mci_host *host) {
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del_timer_sync(&host->disable_timer);
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if (!host->clk_enabled) {
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glamo_engine_enable(host->core, GLAMO_ENGINE_MMC);
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host->clk_enabled = 1;
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}
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}
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static void glamo_mci_disable_timer(unsigned long data) {
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struct glamo_mci_host *host = (struct glamo_mci_host *)data;
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glamo_mci_clock_disable(host);
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}
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static void do_pio_read(struct glamo_mci_host *host, struct mmc_data *data)
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{
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struct scatterlist *sg;
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u16 __iomem *from_ptr = host->data_base;
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void *sg_pointer;
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dev_dbg(&host->pdev->dev, "pio_read():\n");
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for (sg = data->sg; sg; sg = sg_next(sg)) {
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sg_pointer = page_address(sg_page(sg)) + sg->offset;
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memcpy(sg_pointer, from_ptr, sg->length);
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from_ptr += sg->length >> 1;
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data->bytes_xfered += sg->length;
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}
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dev_dbg(&host->pdev->dev, "pio_read(): "
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"complete (no more data).\n");
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}
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static void do_pio_write(struct glamo_mci_host *host, struct mmc_data *data)
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{
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struct scatterlist *sg;
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u16 __iomem *to_ptr = host->data_base;
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void *sg_pointer;
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dev_dbg(&host->pdev->dev, "pio_write():\n");
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for (sg = data->sg; sg; sg = sg_next(sg)) {
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sg_pointer = page_address(sg_page(sg)) + sg->offset;
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data->bytes_xfered += sg->length;
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memcpy(to_ptr, sg_pointer, sg->length);
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to_ptr += sg->length >> 1;
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}
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dev_dbg(&host->pdev->dev, "pio_write(): complete\n");
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}
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static int glamo_mci_set_card_clock(struct glamo_mci_host *host, int freq)
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{
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int real_rate = 0;
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if (freq) {
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glamo_mci_clock_enable(host);
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real_rate = glamo_engine_reclock(host->core, GLAMO_ENGINE_MMC, freq);
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} else {
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glamo_mci_clock_disable(host);
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}
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return real_rate;
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}
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static void glamo_mci_request_done(struct glamo_mci_host *host, struct
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mmc_request *mrq) {
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mod_timer(&host->disable_timer, jiffies + HZ / 16);
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mmc_request_done(host->mmc, mrq);
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}
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static void glamo_mci_irq_worker(struct work_struct *work)
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{
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struct glamo_mci_host *host = container_of(work, struct glamo_mci_host,
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irq_work);
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struct mmc_command *cmd;
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uint16_t status;
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if (!host->mrq || !host->mrq->cmd)
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return;
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cmd = host->mrq->cmd;
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#if 0
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if (cmd->data->flags & MMC_DATA_READ) {
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return;
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}
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#endif
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status = glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1);
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dev_dbg(&host->pdev->dev, "status = 0x%04x\n", status);
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/* we ignore a data timeout report if we are also told the data came */
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if (status & GLAMO_STAT1_MMC_RB_DRDY)
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status &= ~GLAMO_STAT1_MMC_DTOUT;
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if (status & (GLAMO_STAT1_MMC_RTOUT | GLAMO_STAT1_MMC_DTOUT))
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cmd->error = -ETIMEDOUT;
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if (status & (GLAMO_STAT1_MMC_BWERR | GLAMO_STAT1_MMC_BRERR)) {
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cmd->error = -EILSEQ;
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}
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if (cmd->error) {
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dev_info(&host->pdev->dev, "Error after cmd: 0x%x\n", status);
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goto done;
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}
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/* issue STOP if we have been given one to use */
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if (host->mrq->stop) {
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glamo_mci_send_command(host, host->mrq->stop);
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}
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if (cmd->data->flags & MMC_DATA_READ)
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do_pio_read(host, cmd->data);
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done:
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host->mrq = NULL;
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glamo_mci_request_done(host, cmd->mrq);
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}
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static void glamo_mci_read_worker(struct work_struct *work)
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{
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struct glamo_mci_host *host = container_of(work, struct glamo_mci_host,
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read_work);
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struct mmc_command *cmd;
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uint16_t status;
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uint16_t blocks_ready;
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size_t data_read = 0;
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size_t data_ready;
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struct scatterlist *sg;
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u16 __iomem *from_ptr = host->data_base;
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void *sg_pointer;
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cmd = host->mrq->cmd;
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sg = cmd->data->sg;
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do {
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status = glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1);
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if (status & (GLAMO_STAT1_MMC_RTOUT | GLAMO_STAT1_MMC_DTOUT))
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cmd->error = -ETIMEDOUT;
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if (status & (GLAMO_STAT1_MMC_BWERR | GLAMO_STAT1_MMC_BRERR))
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cmd->error = -EILSEQ;
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if (cmd->error) {
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dev_info(&host->pdev->dev, "Error after cmd: 0x%x\n", status);
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goto done;
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}
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blocks_ready = glamo_reg_read(host, GLAMO_REG_MMC_RB_BLKCNT);
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data_ready = blocks_ready * cmd->data->blksz;
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if (data_ready == data_read)
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yield();
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while(sg && data_read + sg->length <= data_ready) {
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sg_pointer = page_address(sg_page(sg)) + sg->offset;
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memcpy(sg_pointer, from_ptr, sg->length);
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from_ptr += sg->length >> 1;
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data_read += sg->length;
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sg = sg_next(sg);
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}
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} while(sg);
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cmd->data->bytes_xfered = data_read;
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do {
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status = glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1);
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} while (!(status & GLAMO_STAT1_MMC_IDLE));
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if (host->mrq->stop)
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glamo_mci_send_command(host, host->mrq->stop);
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do {
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status = glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1);
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} while (!(status & GLAMO_STAT1_MMC_IDLE));
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done:
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host->mrq = NULL;
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glamo_mci_request_done(host, cmd->mrq);
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}
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static irqreturn_t glamo_mci_irq(int irq, void *devid)
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{
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struct glamo_mci_host *host = (struct glamo_mci_host*)devid;
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schedule_work(&host->irq_work);
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return IRQ_HANDLED;
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}
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static void glamo_mci_send_command(struct glamo_mci_host *host,
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struct mmc_command *cmd)
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{
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u8 u8a[6];
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u16 fire = 0;
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unsigned int timeout = 1000000;
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u16 * reg_resp = (u16 *)(host->mmio_base + GLAMO_REG_MMC_CMD_RSP1);
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u16 status;
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int triggers_int = 1;
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/* if we can't do it, reject as busy */
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if (!glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1) &
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GLAMO_STAT1_MMC_IDLE) {
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cmd->error = -EBUSY;
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return;
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}
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/* create an array in wire order for CRC computation */
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u8a[0] = 0x40 | (cmd->opcode & 0x3f);
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u8a[1] = (u8)(cmd->arg >> 24);
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u8a[2] = (u8)(cmd->arg >> 16);
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u8a[3] = (u8)(cmd->arg >> 8);
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u8a[4] = (u8)cmd->arg;
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u8a[5] = (crc7(0, u8a, 5) << 1) | 0x01; /* crc7 on first 5 bytes of packet */
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/* issue the wire-order array including CRC in register order */
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glamo_reg_write(host, GLAMO_REG_MMC_CMD_REG1, ((u8a[4] << 8) | u8a[5]));
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glamo_reg_write(host, GLAMO_REG_MMC_CMD_REG2, ((u8a[2] << 8) | u8a[3]));
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glamo_reg_write(host, GLAMO_REG_MMC_CMD_REG3, ((u8a[0] << 8) | u8a[1]));
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/* command index toggle */
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fire |= (host->request_counter & 1) << 12;
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/* set type of command */
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switch (mmc_cmd_type(cmd)) {
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case MMC_CMD_BC:
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fire |= GLAMO_FIRE_MMC_CMDT_BNR;
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break;
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case MMC_CMD_BCR:
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fire |= GLAMO_FIRE_MMC_CMDT_BR;
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break;
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case MMC_CMD_AC:
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fire |= GLAMO_FIRE_MMC_CMDT_AND;
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break;
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case MMC_CMD_ADTC:
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fire |= GLAMO_FIRE_MMC_CMDT_AD;
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break;
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}
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/*
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* if it expects a response, set the type expected
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*
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* R1, Length : 48bit, Normal response
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* R1b, Length : 48bit, same R1, but added card busy status
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* R2, Length : 136bit (really 128 bits with CRC snipped)
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* R3, Length : 48bit (OCR register value)
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* R4, Length : 48bit, SDIO_OP_CONDITION, Reverse SDIO Card
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* R5, Length : 48bit, IO_RW_DIRECTION, Reverse SDIO Card
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* R6, Length : 48bit (RCA register)
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* R7, Length : 48bit (interface condition, VHS(voltage supplied),
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* check pattern, CRC7)
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*/
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switch (mmc_resp_type(cmd)) {
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case MMC_RSP_R1: /* same index as R6 and R7 */
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fire |= GLAMO_FIRE_MMC_RSPT_R1;
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break;
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case MMC_RSP_R1B:
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fire |= GLAMO_FIRE_MMC_RSPT_R1b;
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break;
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case MMC_RSP_R2:
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fire |= GLAMO_FIRE_MMC_RSPT_R2;
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break;
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case MMC_RSP_R3:
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fire |= GLAMO_FIRE_MMC_RSPT_R3;
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break;
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/* R4 and R5 supported by chip not defined in linux/mmc/core.h (sdio) */
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||
|
}
|
||
|
/*
|
||
|
* From the command index, set up the command class in the host ctrllr
|
||
|
*
|
||
|
* missing guys present on chip but couldn't figure out how to use yet:
|
||
|
* 0x0 "stream read"
|
||
|
* 0x9 "cancel running command"
|
||
|
*/
|
||
|
switch (cmd->opcode) {
|
||
|
case MMC_READ_SINGLE_BLOCK:
|
||
|
fire |= GLAMO_FIRE_MMC_CC_SBR; /* single block read */
|
||
|
break;
|
||
|
case MMC_SWITCH: /* 64 byte payload */
|
||
|
case SD_APP_SEND_SCR:
|
||
|
case MMC_READ_MULTIPLE_BLOCK:
|
||
|
/* we will get an interrupt off this */
|
||
|
if (!cmd->mrq->stop)
|
||
|
/* multiblock no stop */
|
||
|
fire |= GLAMO_FIRE_MMC_CC_MBRNS;
|
||
|
else
|
||
|
/* multiblock with stop */
|
||
|
fire |= GLAMO_FIRE_MMC_CC_MBRS;
|
||
|
break;
|
||
|
case MMC_WRITE_BLOCK:
|
||
|
fire |= GLAMO_FIRE_MMC_CC_SBW; /* single block write */
|
||
|
break;
|
||
|
case MMC_WRITE_MULTIPLE_BLOCK:
|
||
|
if (cmd->mrq->stop)
|
||
|
/* multiblock with stop */
|
||
|
fire |= GLAMO_FIRE_MMC_CC_MBWS;
|
||
|
else
|
||
|
/* multiblock NO stop-- 'RESERVED'? */
|
||
|
fire |= GLAMO_FIRE_MMC_CC_MBWNS;
|
||
|
break;
|
||
|
case MMC_STOP_TRANSMISSION:
|
||
|
fire |= GLAMO_FIRE_MMC_CC_STOP; /* STOP */
|
||
|
triggers_int = 0;
|
||
|
break;
|
||
|
default:
|
||
|
fire |= GLAMO_FIRE_MMC_CC_BASIC; /* "basic command" */
|
||
|
triggers_int = 0;
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
if (cmd->data)
|
||
|
host->mrq = cmd->mrq;
|
||
|
|
||
|
/* always largest timeout */
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_TIMEOUT, 0xfff);
|
||
|
|
||
|
/* Generate interrupt on txfer */
|
||
|
glamo_reg_set_bit_mask(host, GLAMO_REG_MMC_BASIC, 0xff36,
|
||
|
0x0800 |
|
||
|
GLAMO_BASIC_MMC_NO_CLK_RD_WAIT |
|
||
|
GLAMO_BASIC_MMC_EN_COMPL_INT |
|
||
|
GLAMO_BASIC_MMC_EN_DATA_PUPS |
|
||
|
GLAMO_BASIC_MMC_EN_CMD_PUP);
|
||
|
|
||
|
/* send the command out on the wire */
|
||
|
/* dev_info(&host->pdev->dev, "Using FIRE %04X\n", fire); */
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_CMD_FIRE, fire);
|
||
|
|
||
|
/* we are deselecting card? because it isn't going to ack then... */
|
||
|
if ((cmd->opcode == 7) && (cmd->arg == 0))
|
||
|
return;
|
||
|
|
||
|
/*
|
||
|
* we must spin until response is ready or timed out
|
||
|
* -- we don't get interrupts unless there is a bulk rx
|
||
|
*/
|
||
|
do
|
||
|
status = glamo_reg_read(host, GLAMO_REG_MMC_RB_STAT1);
|
||
|
while (((((status >> 15) & 1) != (host->request_counter & 1)) ||
|
||
|
(!(status & (GLAMO_STAT1_MMC_RB_RRDY |
|
||
|
GLAMO_STAT1_MMC_RTOUT |
|
||
|
GLAMO_STAT1_MMC_DTOUT |
|
||
|
GLAMO_STAT1_MMC_BWERR |
|
||
|
GLAMO_STAT1_MMC_BRERR)))) && (timeout--));
|
||
|
|
||
|
if ((status & (GLAMO_STAT1_MMC_RTOUT |
|
||
|
GLAMO_STAT1_MMC_DTOUT)) ||
|
||
|
(timeout == 0)) {
|
||
|
cmd->error = -ETIMEDOUT;
|
||
|
} else if (status & (GLAMO_STAT1_MMC_BWERR | GLAMO_STAT1_MMC_BRERR)) {
|
||
|
cmd->error = -EILSEQ;
|
||
|
}
|
||
|
|
||
|
if (cmd->flags & MMC_RSP_PRESENT) {
|
||
|
if (cmd->flags & MMC_RSP_136) {
|
||
|
cmd->resp[3] = readw(®_resp[0]) |
|
||
|
(readw(®_resp[1]) << 16);
|
||
|
cmd->resp[2] = readw(®_resp[2]) |
|
||
|
(readw(®_resp[3]) << 16);
|
||
|
cmd->resp[1] = readw(®_resp[4]) |
|
||
|
(readw(®_resp[5]) << 16);
|
||
|
cmd->resp[0] = readw(®_resp[6]) |
|
||
|
(readw(®_resp[7]) << 16);
|
||
|
} else {
|
||
|
cmd->resp[0] = (readw(®_resp[0]) >> 8) |
|
||
|
(readw(®_resp[1]) << 8) |
|
||
|
((readw(®_resp[2])) << 24);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
#if 0
|
||
|
/* We'll only get an interrupt when all data has been transfered.
|
||
|
By starting to copy data when it's avaiable we can increase throughput by
|
||
|
up to 30%. */
|
||
|
if (cmd->data && (cmd->data->flags & MMC_DATA_READ))
|
||
|
schedule_work(&host->read_work);
|
||
|
#endif
|
||
|
|
||
|
}
|
||
|
|
||
|
static int glamo_mci_prepare_pio(struct glamo_mci_host *host,
|
||
|
struct mmc_data *data)
|
||
|
{
|
||
|
/* set up the block info */
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_DATBLKLEN, data->blksz);
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_DATBLKCNT, data->blocks);
|
||
|
|
||
|
data->bytes_xfered = 0;
|
||
|
|
||
|
/* if write, prep the write into the shared RAM before the command */
|
||
|
if (data->flags & MMC_DATA_WRITE) {
|
||
|
do_pio_write(host, data);
|
||
|
}
|
||
|
|
||
|
dev_dbg(&host->pdev->dev, "(blksz=%d, count=%d)\n",
|
||
|
data->blksz, data->blocks);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int glamo_mci_irq_poll(struct glamo_mci_host *host,
|
||
|
struct mmc_command *cmd)
|
||
|
{
|
||
|
int timeout = 1000000;
|
||
|
/*
|
||
|
* if the glamo INT# line isn't wired (*cough* it can happen)
|
||
|
* I'm afraid we have to spin on the IRQ status bit and "be
|
||
|
* our own INT# line"
|
||
|
*/
|
||
|
/*
|
||
|
* we have faith we will get an "interrupt"...
|
||
|
* but something insane like suspend problems can mean
|
||
|
* we spin here forever, so we timeout after a LONG time
|
||
|
*/
|
||
|
while ((!(readw(host->core->base +
|
||
|
GLAMO_REG_IRQ_STATUS) & GLAMO_IRQ_MMC)) &&
|
||
|
(timeout--));
|
||
|
|
||
|
if (timeout < 0) {
|
||
|
if (cmd->data->error)
|
||
|
cmd->data->error = -ETIMEDOUT;
|
||
|
dev_err(&host->pdev->dev, "Payload timeout\n");
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
/* ack this interrupt source */
|
||
|
writew(GLAMO_IRQ_MMC, host->core->base +
|
||
|
GLAMO_REG_IRQ_CLEAR);
|
||
|
|
||
|
/* yay we are an interrupt controller! -- call the ISR
|
||
|
* it will stop clock to card
|
||
|
*/
|
||
|
glamo_mci_irq(host->irq, host);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void glamo_mci_send_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
||
|
{
|
||
|
struct glamo_mci_host *host = mmc_priv(mmc);
|
||
|
struct mmc_command *cmd = mrq->cmd;
|
||
|
|
||
|
glamo_mci_clock_enable(host);
|
||
|
host->request_counter++;
|
||
|
if (cmd->data) {
|
||
|
if(glamo_mci_prepare_pio(host, cmd->data)) {
|
||
|
cmd->error = -EIO;
|
||
|
cmd->data->error = -EIO;
|
||
|
goto done;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
dev_dbg(&host->pdev->dev,"cmd 0x%x, "
|
||
|
"arg 0x%x data=%p mrq->stop=%p flags 0x%x\n",
|
||
|
cmd->opcode, cmd->arg, cmd->data, cmd->mrq->stop,
|
||
|
cmd->flags);
|
||
|
|
||
|
glamo_mci_send_command(host, cmd);
|
||
|
|
||
|
/*
|
||
|
* if we don't have bulk data to take care of, we're done
|
||
|
*/
|
||
|
if (!cmd->data || cmd->error)
|
||
|
goto done;
|
||
|
|
||
|
|
||
|
if (!host->core->irq_works) {
|
||
|
if (glamo_mci_irq_poll(host, mrq->cmd))
|
||
|
goto done;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Otherwise can can use the interrupt as async completion --
|
||
|
* if there is read data coming, or we wait for write data to complete,
|
||
|
* exit without mmc_request_done() as the payload interrupt
|
||
|
* will service it
|
||
|
*/
|
||
|
dev_dbg(&host->pdev->dev, "Waiting for payload data\n");
|
||
|
return;
|
||
|
done:
|
||
|
glamo_mci_request_done(host, mrq);
|
||
|
}
|
||
|
|
||
|
static void glamo_mci_set_power_mode(struct glamo_mci_host *host,
|
||
|
unsigned char power_mode) {
|
||
|
int ret;
|
||
|
|
||
|
if (power_mode == host->power_mode)
|
||
|
return;
|
||
|
|
||
|
switch(power_mode) {
|
||
|
case MMC_POWER_UP:
|
||
|
if (host->power_mode == MMC_POWER_OFF) {
|
||
|
ret = regulator_enable(host->regulator);
|
||
|
if (ret)
|
||
|
dev_err(&host->pdev->dev, "Failed to enable regulator: %d\n", ret);
|
||
|
}
|
||
|
break;
|
||
|
case MMC_POWER_ON:
|
||
|
break;
|
||
|
case MMC_POWER_OFF:
|
||
|
default:
|
||
|
glamo_engine_disable(host->core,
|
||
|
GLAMO_ENGINE_MMC);
|
||
|
|
||
|
ret = regulator_disable(host->regulator);
|
||
|
if (ret)
|
||
|
dev_warn(&host->pdev->dev, "Failed to disable regulator: %d\n", ret);
|
||
|
break;
|
||
|
}
|
||
|
host->power_mode = power_mode;
|
||
|
}
|
||
|
|
||
|
static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
||
|
{
|
||
|
struct glamo_mci_host *host = mmc_priv(mmc);
|
||
|
int bus_width = 0;
|
||
|
int rate;
|
||
|
int sd_drive;
|
||
|
int ret;
|
||
|
|
||
|
/* Set power */
|
||
|
glamo_mci_set_power_mode(host, ios->power_mode);
|
||
|
|
||
|
if (host->vdd != ios->vdd) {
|
||
|
ret = mmc_regulator_set_ocr(host->regulator, ios->vdd);
|
||
|
if (ret)
|
||
|
dev_err(&host->pdev->dev, "Failed to set regulator voltage: %d\n", ret);
|
||
|
else
|
||
|
host->vdd = ios->vdd;
|
||
|
}
|
||
|
rate = glamo_mci_set_card_clock(host, ios->clock);
|
||
|
|
||
|
if ((ios->power_mode == MMC_POWER_ON) ||
|
||
|
(ios->power_mode == MMC_POWER_UP)) {
|
||
|
dev_info(&host->pdev->dev,
|
||
|
"powered (vdd = %hu) clk: %dkHz div=%hu (req: %ukHz). "
|
||
|
"Bus width=%d\n", ios->vdd,
|
||
|
rate / 1000, 0,
|
||
|
ios->clock / 1000, (int)ios->bus_width);
|
||
|
} else {
|
||
|
dev_info(&host->pdev->dev, "glamo_mci_set_ios: power down.\n");
|
||
|
}
|
||
|
|
||
|
/* set bus width */
|
||
|
if (ios->bus_width == MMC_BUS_WIDTH_4)
|
||
|
bus_width = GLAMO_BASIC_MMC_EN_4BIT_DATA;
|
||
|
|
||
|
sd_drive = (rate * 4) / host->clk_rate;
|
||
|
if (sd_drive > 3)
|
||
|
sd_drive = 3;
|
||
|
|
||
|
glamo_reg_set_bit_mask(host, GLAMO_REG_MMC_BASIC,
|
||
|
GLAMO_BASIC_MMC_EN_4BIT_DATA | 0xb0,
|
||
|
bus_width | sd_drive << 6);
|
||
|
}
|
||
|
|
||
|
|
||
|
/*
|
||
|
* no physical write protect supported by us
|
||
|
*/
|
||
|
static int glamo_mci_get_ro(struct mmc_host *mmc)
|
||
|
{
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct mmc_host_ops glamo_mci_ops = {
|
||
|
.request = glamo_mci_send_request,
|
||
|
.set_ios = glamo_mci_set_ios,
|
||
|
.get_ro = glamo_mci_get_ro,
|
||
|
};
|
||
|
|
||
|
static int glamo_mci_probe(struct platform_device *pdev)
|
||
|
{
|
||
|
struct mmc_host *mmc;
|
||
|
struct glamo_mci_host *host;
|
||
|
struct glamo_core *core = dev_get_drvdata(pdev->dev.parent);
|
||
|
int ret;
|
||
|
|
||
|
dev_info(&pdev->dev, "glamo_mci driver (C)2007 Openmoko, Inc\n");
|
||
|
|
||
|
mmc = mmc_alloc_host(sizeof(struct glamo_mci_host), &pdev->dev);
|
||
|
if (!mmc) {
|
||
|
ret = -ENOMEM;
|
||
|
goto probe_out;
|
||
|
}
|
||
|
|
||
|
host = mmc_priv(mmc);
|
||
|
host->mmc = mmc;
|
||
|
host->pdev = pdev;
|
||
|
if (core->pdata)
|
||
|
host->pdata = core->pdata->mmc_data;
|
||
|
host->power_mode = MMC_POWER_OFF;
|
||
|
host->clk_enabled = 0;
|
||
|
host->core = core;
|
||
|
host->irq = platform_get_irq(pdev, 0);
|
||
|
|
||
|
INIT_WORK(&host->irq_work, glamo_mci_irq_worker);
|
||
|
INIT_WORK(&host->read_work, glamo_mci_read_worker);
|
||
|
|
||
|
host->regulator = regulator_get(pdev->dev.parent, "SD_3V3");
|
||
|
if (!host->regulator) {
|
||
|
dev_err(&pdev->dev, "Cannot proceed without regulator.\n");
|
||
|
ret = -ENODEV;
|
||
|
goto probe_free_host;
|
||
|
}
|
||
|
|
||
|
host->mmio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
|
if (!host->mmio_mem) {
|
||
|
dev_err(&pdev->dev,
|
||
|
"failed to get io memory region resouce.\n");
|
||
|
ret = -ENOENT;
|
||
|
goto probe_regulator_put;
|
||
|
}
|
||
|
|
||
|
host->mmio_mem = request_mem_region(host->mmio_mem->start,
|
||
|
resource_size(host->mmio_mem),
|
||
|
pdev->name);
|
||
|
|
||
|
if (!host->mmio_mem) {
|
||
|
dev_err(&pdev->dev, "failed to request io memory region.\n");
|
||
|
ret = -ENOENT;
|
||
|
goto probe_regulator_put;
|
||
|
}
|
||
|
|
||
|
host->mmio_base = ioremap(host->mmio_mem->start,
|
||
|
resource_size(host->mmio_mem));
|
||
|
if (!host->mmio_base) {
|
||
|
dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
|
||
|
ret = -EINVAL;
|
||
|
goto probe_free_mem_region_mmio;
|
||
|
}
|
||
|
|
||
|
|
||
|
/* Get ahold of our data buffer we use for data in and out on MMC */
|
||
|
host->data_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
||
|
if (!host->data_mem) {
|
||
|
dev_err(&pdev->dev,
|
||
|
"failed to get io memory region resource.\n");
|
||
|
ret = -ENOENT;
|
||
|
goto probe_iounmap_mmio;
|
||
|
}
|
||
|
|
||
|
host->data_mem = request_mem_region(host->data_mem->start,
|
||
|
resource_size(host->data_mem),
|
||
|
pdev->name);
|
||
|
|
||
|
if (!host->data_mem) {
|
||
|
dev_err(&pdev->dev, "failed to request io memory region.\n");
|
||
|
ret = -ENOENT;
|
||
|
goto probe_iounmap_mmio;
|
||
|
}
|
||
|
host->data_base = ioremap(host->data_mem->start,
|
||
|
resource_size(host->data_mem));
|
||
|
|
||
|
if (host->data_base == 0) {
|
||
|
dev_err(&pdev->dev, "failed to ioremap() io memory region.\n");
|
||
|
ret = -EINVAL;
|
||
|
goto probe_free_mem_region_data;
|
||
|
}
|
||
|
|
||
|
ret = request_irq(host->irq, glamo_mci_irq, IRQF_SHARED,
|
||
|
pdev->name, host);
|
||
|
if (ret) {
|
||
|
dev_err(&pdev->dev, "failed to register irq.\n");
|
||
|
goto probe_iounmap_data;
|
||
|
}
|
||
|
|
||
|
|
||
|
host->vdd = 0;
|
||
|
host->clk_rate = glamo_pll_rate(host->core, GLAMO_PLL1);
|
||
|
|
||
|
/* explain our host controller capabilities */
|
||
|
mmc->ops = &glamo_mci_ops;
|
||
|
mmc->ocr_avail = mmc_regulator_get_ocrmask(host->regulator);
|
||
|
mmc->caps = MMC_CAP_4_BIT_DATA |
|
||
|
MMC_CAP_MMC_HIGHSPEED |
|
||
|
MMC_CAP_SD_HIGHSPEED;
|
||
|
mmc->f_min = host->clk_rate / 256;
|
||
|
mmc->f_max = sd_max_clk;
|
||
|
|
||
|
mmc->max_blk_count = (1 << 16) - 1; /* GLAMO_REG_MMC_RB_BLKCNT */
|
||
|
mmc->max_blk_size = (1 << 12) - 1; /* GLAMO_REG_MMC_RB_BLKLEN */
|
||
|
mmc->max_req_size = resource_size(host->data_mem);
|
||
|
mmc->max_seg_size = mmc->max_req_size;
|
||
|
mmc->max_phys_segs = 128;
|
||
|
mmc->max_hw_segs = 128;
|
||
|
|
||
|
if (mmc->ocr_avail < 0) {
|
||
|
dev_warn(&pdev->dev, "Failed to get ocr list for regulator: %d.\n",
|
||
|
mmc->ocr_avail);
|
||
|
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
|
||
|
}
|
||
|
|
||
|
platform_set_drvdata(pdev, mmc);
|
||
|
|
||
|
glamo_engine_enable(host->core, GLAMO_ENGINE_MMC);
|
||
|
glamo_engine_reset(host->core, GLAMO_ENGINE_MMC);
|
||
|
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_WDATADS1,
|
||
|
(u16)(host->data_mem->start));
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_WDATADS2,
|
||
|
(u16)(host->data_mem->start >> 16));
|
||
|
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_RDATADS1,
|
||
|
(u16)(host->data_mem->start));
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_RDATADS2,
|
||
|
(u16)(host->data_mem->start >> 16));
|
||
|
|
||
|
setup_timer(&host->disable_timer, glamo_mci_disable_timer,
|
||
|
(unsigned long)host);
|
||
|
|
||
|
if ((ret = mmc_add_host(mmc))) {
|
||
|
dev_err(&pdev->dev, "failed to add mmc host.\n");
|
||
|
goto probe_freeirq;
|
||
|
}
|
||
|
|
||
|
dev_info(&pdev->dev,"initialisation done.\n");
|
||
|
return 0;
|
||
|
|
||
|
probe_freeirq:
|
||
|
free_irq(host->irq, host);
|
||
|
probe_iounmap_data:
|
||
|
iounmap(host->data_base);
|
||
|
probe_free_mem_region_data:
|
||
|
release_mem_region(host->data_mem->start, resource_size(host->data_mem));
|
||
|
probe_iounmap_mmio:
|
||
|
iounmap(host->mmio_base);
|
||
|
probe_free_mem_region_mmio:
|
||
|
release_mem_region(host->mmio_mem->start, resource_size(host->mmio_mem));
|
||
|
probe_regulator_put:
|
||
|
regulator_put(host->regulator);
|
||
|
probe_free_host:
|
||
|
mmc_free_host(mmc);
|
||
|
probe_out:
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int glamo_mci_remove(struct platform_device *pdev)
|
||
|
{
|
||
|
struct mmc_host *mmc = platform_get_drvdata(pdev);
|
||
|
struct glamo_mci_host *host = mmc_priv(mmc);
|
||
|
|
||
|
free_irq(host->irq, host);
|
||
|
|
||
|
mmc_remove_host(mmc);
|
||
|
iounmap(host->mmio_base);
|
||
|
iounmap(host->data_base);
|
||
|
release_mem_region(host->mmio_mem->start, resource_size(host->mmio_mem));
|
||
|
release_mem_region(host->data_mem->start, resource_size(host->data_mem));
|
||
|
|
||
|
regulator_put(host->regulator);
|
||
|
|
||
|
mmc_free_host(mmc);
|
||
|
|
||
|
glamo_engine_disable(host->core, GLAMO_ENGINE_MMC);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
|
||
|
#ifdef CONFIG_PM
|
||
|
|
||
|
static int glamo_mci_suspend(struct device *dev)
|
||
|
{
|
||
|
struct mmc_host *mmc = dev_get_drvdata(dev);
|
||
|
struct glamo_mci_host *host = mmc_priv(mmc);
|
||
|
int ret;
|
||
|
|
||
|
cancel_work_sync(&host->irq_work);
|
||
|
|
||
|
ret = mmc_suspend_host(mmc, PMSG_SUSPEND);
|
||
|
|
||
|
glamo_engine_disable(host->core, GLAMO_ENGINE_MMC);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int glamo_mci_resume(struct device *dev)
|
||
|
{
|
||
|
struct mmc_host *mmc = dev_get_drvdata(dev);
|
||
|
struct glamo_mci_host *host = mmc_priv(mmc);
|
||
|
int ret;
|
||
|
|
||
|
glamo_engine_enable(host->core, GLAMO_ENGINE_MMC);
|
||
|
glamo_engine_reset(host->core, GLAMO_ENGINE_MMC);
|
||
|
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_WDATADS1,
|
||
|
(u16)(host->data_mem->start));
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_WDATADS2,
|
||
|
(u16)(host->data_mem->start >> 16));
|
||
|
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_RDATADS1,
|
||
|
(u16)(host->data_mem->start));
|
||
|
glamo_reg_write(host, GLAMO_REG_MMC_RDATADS2,
|
||
|
(u16)(host->data_mem->start >> 16));
|
||
|
mdelay(5);
|
||
|
|
||
|
ret = mmc_resume_host(host->mmc);
|
||
|
/* glamo_mci_clock_disable(host);*/
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct dev_pm_ops glamo_mci_pm_ops = {
|
||
|
.suspend = glamo_mci_suspend,
|
||
|
.resume = glamo_mci_resume,
|
||
|
};
|
||
|
#define GLAMO_MCI_PM_OPS (&glamo_mci_pm_ops)
|
||
|
|
||
|
#else /* CONFIG_PM */
|
||
|
#define GLAMO_MCI_PM_OPS NULL
|
||
|
#endif /* CONFIG_PM */
|
||
|
|
||
|
|
||
|
static struct platform_driver glamo_mci_driver =
|
||
|
{
|
||
|
.probe = glamo_mci_probe,
|
||
|
.remove = glamo_mci_remove,
|
||
|
.driver = {
|
||
|
.name = "glamo-mci",
|
||
|
.owner = THIS_MODULE,
|
||
|
.pm = GLAMO_MCI_PM_OPS,
|
||
|
},
|
||
|
};
|
||
|
|
||
|
static int __init glamo_mci_init(void)
|
||
|
{
|
||
|
platform_driver_register(&glamo_mci_driver);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void __exit glamo_mci_exit(void)
|
||
|
{
|
||
|
platform_driver_unregister(&glamo_mci_driver);
|
||
|
}
|
||
|
|
||
|
module_init(glamo_mci_init);
|
||
|
module_exit(glamo_mci_exit);
|
||
|
|
||
|
MODULE_DESCRIPTION("Glamo MMC/SD Card Interface driver");
|
||
|
MODULE_LICENSE("GPL");
|
||
|
MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
|