From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753439Ab3GJJ3Y (ORCPT ); Wed, 10 Jul 2013 05:29:24 -0400 Received: from mail-la0-f52.google.com ([209.85.215.52]:65493 "EHLO mail-la0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751620Ab3GJJ3U (ORCPT ); Wed, 10 Jul 2013 05:29:20 -0400 From: Jonas Jensen To: linux-mmc@vger.kernel.org Cc: cjb@laptop.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, arm@kernel.org, Jonas Jensen Subject: [PATCH] mmc: sdhci-moxart: Add MOXA ART SDHCI driver Date: Wed, 10 Jul 2013 11:28:53 +0200 Message-Id: <1373448533-9401-1-git-send-email-jonas.jensen@gmail.com> X-Mailer: git-send-email 1.8.2.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add SDHCI driver for MOXA ART SoCs. Signed-off-by: Jonas Jensen --- Notes: Applies to next-20130703 I know this is a large chunk and there are many pitfalls with the controller. I give you my word it does work / seem to be stable, with or without DMA. Any feedback is appreciated. Tested by creating multiple directories/files and moving the card back and forth to different reader. IRQF_DISABLED is now pointless, remove it from request_irq? drivers/mmc/host/Kconfig | 9 + drivers/mmc/host/Makefile | 1 + drivers/mmc/host/sdhci-moxart.c | 786 ++++++++++++++++++++++++++++++++++++++++ drivers/mmc/host/sdhci-moxart.h | 155 ++++++++ 4 files changed, 951 insertions(+) create mode 100644 drivers/mmc/host/sdhci-moxart.c create mode 100644 drivers/mmc/host/sdhci-moxart.h diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 1be2289..fb401c4 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -260,6 +260,15 @@ config MMC_SDHCI_BCM2835 If unsure, say N. +config MMC_SDHCI_MOXART + tristate "MOXART SD Host Controller Interface support" + depends on ARCH_MOXART && MMC + help + This selects the MOXART SD Host Controller Interface. + MOXA provides one multi-functional card reader which can + be found on some embedded hardware such as UC-7112-LX. + If you have a controller with this interface, say Y here. + config MMC_OMAP tristate "TI OMAP Multimedia Card Interface support" depends on ARCH_OMAP diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index 67718c1..274199a 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -62,6 +62,7 @@ obj-$(CONFIG_MMC_SDHCI_TEGRA) += sdhci-tegra.o obj-$(CONFIG_MMC_SDHCI_OF_ESDHC) += sdhci-of-esdhc.o obj-$(CONFIG_MMC_SDHCI_OF_HLWD) += sdhci-of-hlwd.o obj-$(CONFIG_MMC_SDHCI_BCM2835) += sdhci-bcm2835.o +obj-$(CONFIG_MMC_SDHCI_MOXART) += sdhci-moxart.o ifeq ($(CONFIG_CB710_DEBUG),y) CFLAGS-cb710-mmc += -DDEBUG diff --git a/drivers/mmc/host/sdhci-moxart.c b/drivers/mmc/host/sdhci-moxart.c new file mode 100644 index 0000000..f5aaea6 --- /dev/null +++ b/drivers/mmc/host/sdhci-moxart.c @@ -0,0 +1,786 @@ +/* + * MOXA ART MMC host driver. + * + * Copyright (C) 2013 Jonas Jensen + * + * Jonas Jensen + * + * Based on code from + * Moxa Technology Co., Ltd. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "sdhci-moxart.h" + +#define DMA_FIFO_LEN_FORCE 0 +#define APB_DMA_SD_REQ_NO 5 +#define MIN_POWER (MMC_VDD_360 - MSD_SD_POWER_MASK) + +static inline void moxart_init_sg(struct moxart_host *host, + struct mmc_data *data) +{ + host->cur_sg = data->sg; + host->num_sg = data->sg_len; + host->remain = host->cur_sg->length; + + if (host->remain > host->size) + host->remain = host->size; + + data->error = MMC_ERR_NONE; +} + +static inline int moxart_next_sg(struct moxart_host *host) +{ + int remain; + struct mmc_data *data = host->mrq->cmd->data; + + host->cur_sg++; + host->num_sg--; + + if (host->num_sg > 0) { + host->remain = host->cur_sg->length; + remain = host->size - data->bytes_xfered; + if (remain > 0 && remain < host->remain) + host->remain = remain; + } + + return host->num_sg; +} + +static void moxart_send_command(struct moxart_host *host, + struct mmc_command *cmd) +{ + unsigned int status, cmdctrl; + int retry = 0; + + dev_dbg(mmc_dev(host->mmc), "%s: cmd->opcode=%d\n", + __func__, cmd->opcode); + + cmd->error = MMC_ERR_TIMEOUT; + + writel(MSD_RSP_TIMEOUT | MSD_RSP_CRC_OK | + MSD_RSP_CRC_FAIL | MSD_CMD_SENT, &host->reg->clear); + writel(cmd->arg, &host->reg->argument); + + cmdctrl = cmd->opcode & MSD_CMD_IDX_MASK; + if (cmdctrl == SD_APP_SET_BUS_WIDTH || cmdctrl == SD_APP_OP_COND || + cmdctrl == SD_APP_SEND_SCR || cmdctrl == SD_APP_SD_STATUS || + cmdctrl == SD_APP_SEND_NUM_WR_BLKS) + cmdctrl |= MSD_APP_CMD; + + if (cmd->flags & MMC_RSP_136) + cmdctrl |= (MSD_LONG_RSP | MSD_NEED_RSP); + else + cmdctrl |= MSD_NEED_RSP; + + writel(cmdctrl | MSD_CMD_EN, &host->reg->command); + + while (retry++ < MSD_RETRY_COUNT) { + udelay(10); + status = readl(&host->reg->status); + if (status & MSD_CARD_DETECT) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_CARD_DETECT\n", + __func__); + cmd->error = MMC_ERR_TIMEOUT; + break; + } + if (cmdctrl & MSD_NEED_RSP) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_NEED_RSP\n", + __func__); + if (status & MSD_RSP_TIMEOUT) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_RSP_TIMEOUT\n", + __func__); + writel(MSD_RSP_TIMEOUT, &host->reg->clear); + cmd->error = MMC_ERR_TIMEOUT; + break; + } + if ((cmd->flags & MMC_RSP_CRC) && + (status & MSD_RSP_CRC_FAIL)) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_RSP_CRC_FAIL\n", + __func__); + writel(MSD_RSP_CRC_FAIL, &host->reg->clear); + cmd->error = MMC_ERR_BADCRC; + break; + } + if (status & MSD_RSP_CRC_OK) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_RSP_CRC_OK\n", + __func__); + writel(MSD_RSP_CRC_OK, &host->reg->clear); + + if (cmd->flags & MMC_RSP_136) { + cmd->resp[3] = + readl(&host->reg->response0); + cmd->resp[2] = + readl(&host->reg->response1); + cmd->resp[1] = + readl(&host->reg->response2); + cmd->resp[0] = + readl(&host->reg->response3); + } else { + cmd->resp[0] = + readl(&host->reg->response0); + } + + cmd->error = MMC_ERR_NONE; + break; + } + } else { + dev_dbg(mmc_dev(host->mmc), "%s: !(cmdctrl & MSD_NEED_RSP)\n", + __func__); + if (status & MSD_CMD_SENT) { + writel(MSD_CMD_SENT, &host->reg->clear); + cmd->error = MMC_ERR_NONE; + break; + } + } + } + + if (retry >= (MSD_RETRY_COUNT - 1)) { + /* + * this seems to happen a lot on or after CMD25 + * (MMC_WRITE_MULTIPLE_BLOCK) with more than 4 blocks + * (>4096), possibly because the transfer is too big + * or takes too long to complete. + * when this happens the controller is usually rendered + * unresponsive and can only be recovered with reboot. + */ + dev_dbg(mmc_dev(host->mmc), "%s: WARNING! no valid status found!\n", + __func__); + } +} + +static void moxart_dma_complete(void *param) +{ + struct moxart_host *host = param; + + dev_dbg(mmc_dev(host->mmc), "%s: host=%p\n", __func__, host); + complete(&host->dma_complete); +} + +static void moxart_transfer_dma(struct mmc_data *data, struct moxart_host *host) +{ + unsigned int len, direction_dev; + struct dma_async_tx_descriptor *desc = NULL; + + if (host->size == data->bytes_xfered) + return; + + direction_dev = (data->flags & MMC_DATA_WRITE) ? + DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; + + /* + * because dma_map_sg takes both sg and sg_len as arguments + * (and maps the entire list of buffers) data->sg does not + * have to be incremented between calls (as is required + * in moxart_transfer_pio) + */ + len = dma_map_sg(host->dma_chan_cur->device->dev, data->sg, + data->sg_len, host->dma_direction); + + if (len > 0) { + /* host->dma_active = true;*/ + desc = dmaengine_prep_slave_sg(host->dma_chan_cur, data->sg, + len, direction_dev, + DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + } else { + pr_err("%s: dma_map_sg returned zero length\n", + __func__); + } + + if (desc) { + desc->callback = moxart_dma_complete; + desc->callback_param = host; + dmaengine_submit(desc); + dma_async_issue_pending(host->dma_chan_cur); + } + + data->bytes_xfered += host->remain; +} + +/* when DMA is available this is used only for SD_APP_SEND_SCR */ +static void moxart_transfer_pio(struct moxart_host *host) +{ + unsigned char *buffer; + unsigned int wcnt, i; + struct mmc_data *data = host->mrq->cmd->data; + + if (host->size == data->bytes_xfered) + goto transfer_complete; + + buffer = sg_virt(host->cur_sg); + wcnt = host->remain >> 2; + + if (data->flags & MMC_DATA_WRITE) { + for (i = 0; i < wcnt; i++, buffer += 4) { + writel(*(unsigned int *)buffer, + &host->reg->data_window); + udelay(10); + } + } else { + for (i = 0; i < wcnt; i++, buffer += 4) { + /* byte order reversed only when reading SCR */ + if (data->mrq->cmd->opcode == SD_APP_SEND_SCR) { + *(unsigned int *)buffer = ioread32be( + &host->reg->data_window); + } else { + *(unsigned int *)buffer = + readl(&host->reg->data_window); + } + udelay(10); + } + } + wcnt <<= 2; + host->remain -= wcnt; + data->bytes_xfered += wcnt; + + if (host->size != data->bytes_xfered) { + moxart_next_sg(host); + /* + * used to goto "transfer_start" label here, + * there is no need, this function will be + * called again from interrupt. + * + * compare with DMA where sg increment is + * redundant thanks to dma_map_sg + */ + } else { + complete(&host->pio_complete); + } + +transfer_complete: + dev_dbg(mmc_dev(host->mmc), "%s: host->size=%d host->remain=%u\n", + __func__, host->size, host->remain); +} + +static void moxart_prepare_data(struct moxart_host *host) +{ + struct mmc_data *data = host->mrq->cmd->data; + unsigned int timeout, datactrl; + int blksz_bits; + + dev_dbg(mmc_dev(host->mmc), "%s\n", __func__); + + if (!data) + return; + + host->size = data->blocks * data->blksz; + blksz_bits = ffs(data->blksz) - 1; + BUG_ON(1 << blksz_bits != data->blksz); + + moxart_init_sg(host, data); + + timeout = (host->mmc->f_max / 1000) * (data->timeout_ns / 1000); + timeout *= 2; + + datactrl = (blksz_bits & MSD_BLK_SIZE_MASK) | MSD_DATA_EN; + + if (data->flags & MMC_DATA_WRITE) + datactrl |= MSD_DATA_WRITE; + + if (((host->size > MSD_FIFO_LENB) || DMA_FIFO_LEN_FORCE) + && host->have_dma) { + datactrl |= MSD_DMA_EN; + } + + dev_dbg(mmc_dev(host->mmc), "%s: blocks=%d blksz=%d datactrl=0x%08x\n", + __func__, data->blocks, data->blksz, datactrl); + dev_dbg(mmc_dev(host->mmc), "%s: timeout=%u timeout_ns=%u\n", + __func__, timeout, data->timeout_ns); + + writel(timeout, &host->reg->data_timer); + writel(host->size, &host->reg->data_length); + writel(datactrl, &host->reg->data_control); +} + +static void moxart_transfer_check(struct mmc_data *data, + struct moxart_host *host) +{ + unsigned int status, count = 0; + + dev_dbg(mmc_dev(host->mmc), "%s\n", __func__); + + while (1) { + udelay(10); + status = readl(&host->reg->status); + if (status & (MSD_DATA_CRC_OK | MSD_DATA_CRC_FAIL + | MSD_DATA_END) || count > 10) + break; + dev_dbg(mmc_dev(host->mmc), "%s: waiting for status=%08x ..\n", + __func__, status); + count++; + } + if (status & MSD_DATA_CRC_OK) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_DATA_CRC_OK\n", __func__); + writel(MSD_DATA_CRC_OK, &host->reg->clear); + } + if (status & MSD_DATA_CRC_FAIL) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_DATA_CRC_FAIL\n", + __func__); + writel(MSD_DATA_CRC_FAIL, &host->reg->clear); + data->error = MMC_ERR_TIMEOUT; + } + if (status & MSD_DATA_END) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_DATA_END\n", + __func__); + writel(MSD_DATA_END, &host->reg->clear); + } + if (status & MSD_DATA_TIMEOUT) { + dev_dbg(mmc_dev(host->mmc), "%s: MSD_DATA_TIMEOUT\n", + __func__); + writel(MSD_DATA_TIMEOUT, &host->reg->clear); + } +} + +static void moxart_card_change(struct moxart_host *host) +{ + int delay; + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + + if (readl(&host->reg->status) & MSD_CARD_DETECT) { + dev_dbg(mmc_dev(host->mmc), "%s: card removed\n", __func__); + if (host->have_dma && host->size > MSD_FIFO_LENB) { + dev_dbg(mmc_dev(host->mmc), "%s: call dmaengine_terminate_all\n", + __func__); + dmaengine_terminate_all(host->dma_chan_rx); + dmaengine_terminate_all(host->dma_chan_tx); + } + host->removed = true; + delay = 0; + } else { + dev_dbg(mmc_dev(host->mmc), "%s: card inserted\n", __func__); + host->removed = false; + delay = 500; + } + + /* + * clearing FIFO interrupts here does not stop a follow up + * MSD_FIFO_*RUN after MSD_CARD_CHANGE. instead, check + * host->mrq != NULL in moxart_irq to avoid unnecessary calls + * to moxart_transfer_pio + * if this happens during transfer the mmc_request in + * moxart_request should still be valid + * (which is why host->mrq can be set NULL here) + */ + host->mrq = NULL; + writel(MSD_CARD_CHANGE | MSD_FIFO_ORUN | MSD_FIFO_URUN, + &host->reg->clear); + writel(MSD_CARD_CHANGE, &host->reg->interrupt_mask); + + spin_unlock_irqrestore(&host->lock, flags); + dev_dbg(mmc_dev(host->mmc), "%s: call mmc_detect_change\n", __func__); + mmc_detect_change(host->mmc, msecs_to_jiffies(delay)); +} + +static void moxart_request(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct moxart_host *host = mmc_priv(mmc); + unsigned long dma_time, pio_time, flags; + unsigned int status; + + dev_dbg(mmc_dev(host->mmc), "%s\n", __func__); + + spin_lock_irqsave(&host->lock, flags); + + init_completion(&host->dma_complete); + init_completion(&host->pio_complete); + + host->mrq = mrq; + + if (readl(&host->reg->status) & MSD_CARD_DETECT) { + mrq->cmd->error = MMC_ERR_TIMEOUT; + goto request_done; + } + + moxart_prepare_data(host); + moxart_send_command(host, host->mrq->cmd); + + if (mrq->cmd->data) { + /* only use DMA/PIO (and wait) when there is data */ + if (((host->size > MSD_FIFO_LENB) || DMA_FIFO_LEN_FORCE) + && host->have_dma) { + + writel(MSD_CARD_CHANGE, &host->reg->interrupt_mask); + + spin_unlock_irqrestore(&host->lock, flags); + + host->dma_direction = (mrq->cmd->data->flags + & MMC_DATA_WRITE) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE; + host->dma_chan_cur = (mrq->cmd->data->flags + & MMC_DATA_WRITE) ? + host->dma_chan_tx : + host->dma_chan_rx; + moxart_transfer_dma(mrq->cmd->data, host); + + dma_time = wait_for_completion_interruptible_timeout( + &host->dma_complete, host->timeout); + dev_dbg(mmc_dev(host->mmc), "%s: dma_time=%lu (DMA wait time)\n", + __func__, dma_time); + + dma_unmap_sg(host->dma_chan_cur->device->dev, + mrq->cmd->data->sg, mrq->cmd->data->sg_len, + host->dma_direction); + + spin_lock_irqsave(&host->lock, flags); + } else { + + writel(MSD_FIFO_URUN | MSD_FIFO_ORUN | MSD_CARD_CHANGE, + &host->reg->interrupt_mask); + + status = readl(&host->reg->status); + dev_dbg(mmc_dev(host->mmc), "%s: status=%08x\n", + __func__, status); + + spin_unlock_irqrestore(&host->lock, flags); + + /* PIO transfer started from interrupt */ + pio_time = wait_for_completion_interruptible_timeout( + &host->pio_complete, host->timeout); + dev_dbg(mmc_dev(host->mmc), "%s: pio_time=%lu (PIO wait time)\n", + __func__, pio_time); + + spin_lock_irqsave(&host->lock, flags); + } + + /* removed during transfer? (interrupts were just enabled..) */ + if (host->removed) { + dev_dbg(mmc_dev(host->mmc), "%s: host removed during transfer!\n", + __func__); + mrq->cmd->error = MMC_ERR_TIMEOUT; + } + + moxart_transfer_check(mrq->cmd->data, host); + + if (mrq->cmd->data->stop) + moxart_send_command(host, mrq->cmd->data->stop); + } + +request_done: + spin_unlock_irqrestore(&host->lock, flags); + mmc_request_done(host->mmc, mrq); +} + +static irqreturn_t moxart_irq(int irq, void *devid) +{ + struct moxart_host *host = (struct moxart_host *)devid; + unsigned int status; + unsigned long flags; + + status = readl(&host->reg->status); + + dev_dbg(mmc_dev(host->mmc), "%s: host=%p status=%08x\n", + __func__, host, status); + + if (status & MSD_CARD_CHANGE) { + dev_dbg(mmc_dev(host->mmc), "%s: call moxart_card_change\n", + __func__); + moxart_card_change(host); + } + if (status & (MSD_FIFO_ORUN | MSD_FIFO_URUN) && host->mrq) { + writel(status & (MSD_FIFO_ORUN | MSD_FIFO_URUN), + &host->reg->clear); + dev_dbg(mmc_dev(host->mmc), "%s: call moxart_transfer_pio\n", + __func__); + spin_lock_irqsave(&host->lock, flags); + moxart_transfer_pio(host); + spin_unlock_irqrestore(&host->lock, flags); + } + + return IRQ_HANDLED; +} + +static void moxart_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct moxart_host *host = mmc_priv(mmc); + unsigned long flags; + unsigned short power; + int div; + + spin_lock_irqsave(&host->lock, flags); + if (ios->clock) { + div = (host->sysclk / (host->mmc->f_max * 2)) - 1; + + if (div > MSD_CLK_DIV_MASK) + div = MSD_CLK_DIV_MASK; + else if (div < 0) + div = 0; + + div |= MSD_CLK_SD; + writel(div, &host->reg->clock_control); + } else if (!(readl(&host->reg->clock_control) & MSD_CLK_DIS)) { + writel(readl(&host->reg->clock_control) | MSD_CLK_DIS, + &host->reg->clock_control); + } + + if (ios->power_mode == MMC_POWER_OFF) { + writel(readl(&host->reg->power_control) & ~MSD_SD_POWER_ON, + &host->reg->power_control); + } else { + if (ios->vdd < MIN_POWER) + power = 0; + else + power = ios->vdd - MIN_POWER; + + writel(MSD_SD_POWER_ON | (unsigned int) power, + &host->reg->power_control); + } + + if (ios->bus_width == MMC_BUS_WIDTH_1) + writel(MSD_SINGLE_BUS, &host->reg->bus_width); + else + writel(MSD_WIDE_BUS, &host->reg->bus_width); + + spin_unlock_irqrestore(&host->lock, flags); +} + + +static int moxart_get_ro(struct mmc_host *mmc) +{ + int ret; + struct moxart_host *host = mmc_priv(mmc); + + (readl(&host->reg->status) & MSD_WRITE_PROT) ? (ret = 1) : (ret = 0); + return ret; +} + +static struct mmc_host_ops moxart_ops = { + .request = moxart_request, + .set_ios = moxart_set_ios, + .get_ro = moxart_get_ro, +}; + +static int moxart_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *node = dev->of_node; + struct resource res_mmc; + struct mmc_host *mmc; + struct moxart_host *host = NULL; + void __iomem *reg_mmc; + dma_cap_mask_t mask; + int ret; + struct dma_slave_config cfg; + unsigned int irq; + struct clk *clk; + unsigned int dma_chan_rx_req = 1; + unsigned int dma_chan_tx_req = 0; + + mmc = mmc_alloc_host(sizeof(struct moxart_host), dev); + if (!mmc) { + dev_err(dev, "%s: mmc_alloc_host failed\n", __func__); + ret = -ENOMEM; + goto out; + } + + ret = of_address_to_resource(node, 0, &res_mmc); + if (ret) { + dev_err(dev, "%s: could not get MMC base resource\n", __func__); + goto out; + } + + irq = irq_of_parse_and_map(node, 0); + + reg_mmc = devm_ioremap_resource(dev, &res_mmc); + if (IS_ERR(reg_mmc)) { + dev_err(dev, "%s: devm_ioremap_resource res_mmc failed\n", + __func__); + return PTR_ERR(reg_mmc); + } + + mmc->ops = &moxart_ops; + + /* + * hardware does not support MMC_CAP_SD_HIGHSPEED + * CMD6 will timeout and make things not work + */ + mmc->caps = MMC_CAP_4_BIT_DATA; + + mmc->f_min = 400000; + mmc->f_max = 25000000; + mmc->ocr_avail = 0xffff00; /* support 2.0v - 3.6v power */ + mmc->max_segs = 32; + mmc->max_blk_size = 512; + mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size; + mmc->max_seg_size = mmc->max_req_size; + + host = mmc_priv(mmc); + host->mmc = mmc; + host->reg = (struct moxart_reg *)reg_mmc; + host->reg_phys = res_mmc.start; + host->timeout = msecs_to_jiffies(1000); + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + clk = of_clk_get(node, 0); + if (IS_ERR(clk)) { + dev_err(dev, "%s: of_clk_get failed\n", __func__); + return PTR_ERR(clk); + } + host->sysclk = clk_get_rate(clk); + + spin_lock_init(&host->lock); + + /* disable all interrupt */ + writel(0, &host->reg->interrupt_mask); + + /* reset chip */ + writel(MSD_SDC_RST, &host->reg->command); + + /* wait for reset finished */ + while (readl(&host->reg->command) & MSD_SDC_RST) + udelay(10); + + host->dma_chan_tx = dma_request_channel(mask, moxart_filter_fn, + (void *)&dma_chan_tx_req); + host->dma_chan_rx = dma_request_channel(mask, moxart_filter_fn, + (void *)&dma_chan_rx_req); + dev_dbg(dev, "%s: using 2 DMA channels rx=%p tx=%p\n", + __func__, host->dma_chan_rx, host->dma_chan_tx); + + if (!host->dma_chan_rx || !host->dma_chan_tx) { + host->have_dma = false; + mmc->max_blk_count = 1; + } else { + cfg.slave_id = APB_DMA_SD_REQ_NO; + cfg.direction = DMA_MEM_TO_DEV; + cfg.src_addr = 0; + cfg.dst_addr = (unsigned int)host->reg_phys + MSD_DATA_WIN_REG; + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dmaengine_slave_config(host->dma_chan_tx, &cfg); + + cfg.slave_id = APB_DMA_SD_REQ_NO; + cfg.direction = DMA_DEV_TO_MEM; + cfg.src_addr = (unsigned int)host->reg_phys + MSD_DATA_WIN_REG; + cfg.dst_addr = 0; + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dmaengine_slave_config(host->dma_chan_rx, &cfg); + + host->have_dma = true; + + /* + * there seems to be a max size on transfers so + * set max_blk_count low for both DMA and PIO + * + * sending large chunks result either in timeout + * or render the MMC controller unresponsive + * (status register 0 on consecutive read retries, + * also see comments in moxart_send_command) + * + * obviously, DMA is quicker and can handle + * larger chunks but setting it higher than 16 + * can still bug the controller + */ + mmc->max_blk_count = 16; + } + + ret = request_irq(irq, moxart_irq, + IRQF_DISABLED, "moxart-mmc", host); + + if (ret) + goto out; + + dev_set_drvdata(dev, mmc); + mmc_add_host(mmc); + + dev_dbg(dev, "%s: IRQ=%d\n", __func__, irq); + + return 0; + +out: + if (mmc) + mmc_free_host(mmc); + return ret; +} + +static void moxart_release_dma(struct moxart_host *host) +{ + if (host->dma_chan_tx) { + struct dma_chan *chan = host->dma_chan_tx; + host->dma_chan_tx = NULL; + dma_release_channel(chan); + } + if (host->dma_chan_rx) { + struct dma_chan *chan = host->dma_chan_rx; + host->dma_chan_rx = NULL; + dma_release_channel(chan); + } +} + +static int moxart_remove(struct platform_device *pdev) +{ + struct mmc_host *mmc = dev_get_drvdata(&pdev->dev); + struct moxart_host *host = mmc_priv(mmc); + struct resource *res_irq; + + res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 2); + + dev_set_drvdata(&pdev->dev, NULL); + + if (mmc) { + moxart_release_dma(host); + mmc_remove_host(mmc); + + writel(0, &host->reg->interrupt_mask); + writel(0, &host->reg->power_control); + writel(readl(&host->reg->clock_control) | MSD_CLK_DIS, + &host->reg->clock_control); + + free_irq(res_irq->start, host); + + mmc_free_host(mmc); + } + return 0; +} + +static const struct of_device_id moxart_mmc_match[] = { + { .compatible = "moxa,moxart-mmc" }, + { } +}; + +static struct platform_driver moxart_mmc_driver = { + .probe = moxart_probe, + .remove = moxart_remove, + .driver = { + .name = "sdhci-moxart", + .owner = THIS_MODULE, + .of_match_table = moxart_mmc_match, + }, +}; +module_platform_driver(moxart_mmc_driver); + +MODULE_ALIAS("platform:sdhci-moxart"); +MODULE_DESCRIPTION("MOXART SDHCI driver"); +MODULE_VERSION("1.0"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jonas Jensen "); diff --git a/drivers/mmc/host/sdhci-moxart.h b/drivers/mmc/host/sdhci-moxart.h new file mode 100644 index 0000000..f60bed1 --- /dev/null +++ b/drivers/mmc/host/sdhci-moxart.h @@ -0,0 +1,155 @@ +/* + * MOXA ART MMC host driver. + * + * Copyright (C) 2013 Jonas Jensen + * + * Jonas Jensen + * + * Based on code from + * Moxa Technology Co., Ltd. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#ifndef _SDHCI_MOXART_H +#define _SDHCI_MOXART_H + +extern bool moxart_filter_fn(struct dma_chan *chan, void *param); + +#define MSD_CMD_REG 0 +#define MSD_ARG_REG 4 +#define MSD_RESP0_REG 8 +#define MSD_RESP1_REG 0x0c +#define MSD_RESP2_REG 0x10 +#define MSD_RESP3_REG 0x14 +#define MSD_RESP_CMD_REG 0x18 +#define MSD_DATA_CTRL_REG 0x1c +#define MSD_DATA_TIMER_REG 0x20 +#define MSD_DATA_LEN_REG 0x24 +#define MSD_STATUS_REG 0x28 +#define MSD_CLEAR_REG 0x2c +#define MSD_INT_MASK_REG 0x30 +#define MSD_POWER_CTRL_REG 0x34 +#define MSD_CLOCK_CTRL_REG 0x38 +#define MSD_BUS_WIDTH_REG 0x3c +#define MSD_DATA_WIN_REG 0x40 +#define MSD_FEATURE_REG 0x44 +#define MSD_REVISION_REG 0x48 + +#define MMC_RSP_SHORT (1 << 0) +#define MMC_RSP_LONG (2 << 0) +#define MMC_RSP_MASK (3 << 0) +#define MMC_ERR_NONE 0 +#define MMC_ERR_TIMEOUT 1 +#define MMC_MODE_MMC 0 +#define MMC_MODE_SD 1 +#define MMC_ERR_BADCRC 2 +#define MMC_VDD_360 23 + +#define MSD_RETRY_COUNT 10 + +struct moxart_reg { + +#define MSD_SDC_RST (1<<10) +#define MSD_CMD_EN (1<<9) +#define MSD_APP_CMD (1<<8) +#define MSD_LONG_RSP (1<<7) +#define MSD_NEED_RSP (1<<6) +#define MSD_CMD_IDX_MASK 0x3f + unsigned int command; + + unsigned int argument; + unsigned int response0; + unsigned int response1; + unsigned int response2; + unsigned int response3; + +#define MSD_RSP_CMD_APP (1<<6) +#define MSD_RSP_CMD_IDX_MASK 0x3f + unsigned int response_command; + +#define MSD_DATA_EN (1<<6) +#define MSD_DMA_EN (1<<5) +#define MSD_DATA_WRITE (1<<4) +#define MSD_BLK_SIZE_MASK 0x0f + unsigned int data_control; + + unsigned int data_timer; + +#define MSD_DATA_LEN_MASK 0xffffff + unsigned int data_length; + +#define MSD_WRITE_PROT (1<<12) +#define MSD_CARD_DETECT (1<<11) +/* 1-10 below can be sent to interrupt or clear register */ +#define MSD_CARD_CHANGE (1<<10) +#define MSD_FIFO_ORUN (1<<9) +#define MSD_FIFO_URUN (1<<8) +#define MSD_DATA_END (1<<7) +#define MSD_CMD_SENT (1<<6) +#define MSD_DATA_CRC_OK (1<<5) +#define MSD_RSP_CRC_OK (1<<4) +#define MSD_DATA_TIMEOUT (1<<3) +#define MSD_RSP_TIMEOUT (1<<2) +#define MSD_DATA_CRC_FAIL (1<<1) +#define MSD_RSP_CRC_FAIL (1<<0) + unsigned int status; + + unsigned int clear; + unsigned int interrupt_mask; + +#define MSD_SD_POWER_ON (1<<4) +#define MSD_SD_POWER_MASK 0x0f + unsigned int power_control; + +#define MSD_CLK_DIS (1<<8) +#define MSD_CLK_SD (1<<7) +#define MSD_CLK_DIV_MASK 0x7f + unsigned int clock_control; + +#define MSD_WIDE_BUS_SUPPORT (1<<3) +#define MSD_WIDE_BUS (1<<2) /* bus width is 4 bytes */ +#define MSD_SINGLE_BUS (1<<0) /* bus width is 1 byte */ + unsigned int bus_width; + + unsigned int data_window; + +#define MSD_CPRM_FUNCTION (1<<8) + unsigned int feature; + + unsigned int revision; +}; + +struct moxart_host { + spinlock_t lock; + struct moxart_reg *reg; + phys_addr_t reg_phys; + + struct dma_chan *dma_chan_rx; + struct dma_chan *dma_chan_tx; + struct dma_chan *dma_chan_cur; + unsigned int dma_direction; + bool have_dma; + struct completion dma_complete; + struct completion pio_complete; + + struct mmc_host *mmc; + struct mmc_request *mrq; + + struct scatterlist *cur_sg; + unsigned int num_sg; + unsigned int remain; + int size; + + unsigned int wait_for; + unsigned int timeout; + long sysclk; + bool removed; +}; + +#define MSD_FIFO_LENW 4 /* 4 words, total 4 * 4 = 16 bytes */ +#define MSD_FIFO_LENB 16 /* 16 bytes */ + +#endif /* _SDHCI_MOXART_H */ -- 1.8.2.1