On 9 April 2014 15:54, Jonas Jensen <jonas.jensen@xxxxxxxxx> wrote: > Add SD/MMC driver for MOXA ART SoCs. > > The "MOXA ART MMC controller" is likely a faraday "ftsdc010", > a controller with support in U-Boot: > > http://git.denx.de/?p=u-boot.git;a=blob;f=drivers/mmc/ftsdc010_mci.c > > Signed-off-by: Jonas Jensen <jonas.jensen@xxxxxxxxx> Acked-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> > --- > > Notes: > This has been cleaned up further, especially the return value fiasco in v7. > > The "MOXA ART MMC controller" is likely a faraday "ftsdc010" (supported by U-Boot [1]). > Registers are the same albeit named slightly different. > > I think this can support other "ftsdc010" SoCs with one reservation for > power control, which may need hardware specific changes. > > Changes since v7: > > 1. merge code from U-Boot "ftsdc010" driver [1] > > Specifically how it implements status wait, clock divider, fifo width, bus width. > > 2. return value cleanup, MMC_ERR_TIMEOUT is no longer used or set at the top of every request > > i.e. the default (no error) return value (0) is respected. > > Error is only set on actual error, "MMC_ERR_NONE" is no longer used. > > 3. FIFO size is now read from register (and respected during PIO transfer) > 4. supported bus width(s) is now read from register > 5. !(of_dma_request_slave_channel()) return value check is wrong, > IS_ERR() must be used. > 6. clean up and remove unused defines / header includes > 7. add "faraday,ftsdc010" compatible string (requested by Arnd) > > [1] http://git.denx.de/?p=u-boot.git;a=blob;f=drivers/mmc/ftsdc010_mci.c > > Applies to next-20140409 > > .../devicetree/bindings/mmc/moxa,moxart-mmc.txt | 30 + > drivers/mmc/host/Kconfig | 9 + > drivers/mmc/host/Makefile | 1 + > drivers/mmc/host/moxart-mmc.c | 730 +++++++++++++++++++++ > 4 files changed, 770 insertions(+) > create mode 100644 Documentation/devicetree/bindings/mmc/moxa,moxart-mmc.txt > create mode 100644 drivers/mmc/host/moxart-mmc.c > > diff --git a/Documentation/devicetree/bindings/mmc/moxa,moxart-mmc.txt b/Documentation/devicetree/bindings/mmc/moxa,moxart-mmc.txt > new file mode 100644 > index 0000000..b638191 > --- /dev/null > +++ b/Documentation/devicetree/bindings/mmc/moxa,moxart-mmc.txt > @@ -0,0 +1,30 @@ > +MOXA ART MMC Host Controller Interface > + > + Inherits from mmc binding[1]. > + > + [1] Documentation/devicetree/bindings/mmc/mmc.txt > + > +Required properties: > + > +- compatible : Must be "moxa,moxart-mmc" or "faraday,ftsdc010" > +- reg : Should contain registers location and length > +- interrupts : Should contain the interrupt number > +- clocks : Should contain phandle for the clock feeding the MMC controller > + > +Optional properties: > + > +- dmas : Should contain two DMA channels, line request number must be 5 for > + both channels > +- dma-names : Must be "tx", "rx" > + > +Example: > + > + mmc: mmc@98e00000 { > + compatible = "moxa,moxart-mmc"; > + reg = <0x98e00000 0x5C>; > + interrupts = <5 0>; > + clocks = <&clk_apb>; > + dmas = <&dma 5>, > + <&dma 5>; > + dma-names = "tx", "rx"; > + }; > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig > index 8aaf8c1..eb93b81 100644 > --- a/drivers/mmc/host/Kconfig > +++ b/drivers/mmc/host/Kconfig > @@ -283,6 +283,15 @@ config MMC_SDHCI_BCM2835 > > If unsure, say N. > > +config MMC_MOXART > + tristate "MOXART SD/MMC Host Controller support" > + depends on ARCH_MOXART && MMC > + help > + This selects support for the MOXART SD/MMC Host Controller. > + 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 0c8aa5e..dfa6ecb 100644 > --- a/drivers/mmc/host/Makefile > +++ b/drivers/mmc/host/Makefile > @@ -50,6 +50,7 @@ obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o > obj-$(CONFIG_MMC_VUB300) += vub300.o > obj-$(CONFIG_MMC_USHC) += ushc.o > obj-$(CONFIG_MMC_WMT) += wmt-sdmmc.o > +obj-$(CONFIG_MMC_MOXART) += moxart-mmc.o > > obj-$(CONFIG_MMC_REALTEK_PCI) += rtsx_pci_sdmmc.o > > diff --git a/drivers/mmc/host/moxart-mmc.c b/drivers/mmc/host/moxart-mmc.c > new file mode 100644 > index 0000000..74924a0 > --- /dev/null > +++ b/drivers/mmc/host/moxart-mmc.c > @@ -0,0 +1,730 @@ > +/* > + * MOXA ART MMC host driver. > + * > + * Copyright (C) 2014 Jonas Jensen > + * > + * Jonas Jensen <jonas.jensen@xxxxxxxxx> > + * > + * Based on code from > + * Moxa Technologies Co., Ltd. <www.moxa.com> > + * > + * 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 <linux/version.h> > +#include <linux/module.h> > +#include <linux/init.h> > +#include <linux/platform_device.h> > +#include <linux/delay.h> > +#include <linux/interrupt.h> > +#include <linux/blkdev.h> > +#include <linux/dma-mapping.h> > +#include <linux/dmaengine.h> > +#include <linux/mmc/host.h> > +#include <linux/mmc/sd.h> > +#include <linux/sched.h> > +#include <linux/io.h> > +#include <linux/of_address.h> > +#include <linux/of_irq.h> > +#include <linux/clk.h> > +#include <linux/bitops.h> > +#include <linux/of_dma.h> > +#include <linux/spinlock.h> > + > +#define REG_COMMAND 0 > +#define REG_ARGUMENT 4 > +#define REG_RESPONSE0 8 > +#define REG_RESPONSE1 12 > +#define REG_RESPONSE2 16 > +#define REG_RESPONSE3 20 > +#define REG_RESPONSE_COMMAND 24 > +#define REG_DATA_CONTROL 28 > +#define REG_DATA_TIMER 32 > +#define REG_DATA_LENGTH 36 > +#define REG_STATUS 40 > +#define REG_CLEAR 44 > +#define REG_INTERRUPT_MASK 48 > +#define REG_POWER_CONTROL 52 > +#define REG_CLOCK_CONTROL 56 > +#define REG_BUS_WIDTH 60 > +#define REG_DATA_WINDOW 64 > +#define REG_FEATURE 68 > +#define REG_REVISION 72 > + > +/* REG_COMMAND */ > +#define CMD_SDC_RESET BIT(10) > +#define CMD_EN BIT(9) > +#define CMD_APP_CMD BIT(8) > +#define CMD_LONG_RSP BIT(7) > +#define CMD_NEED_RSP BIT(6) > +#define CMD_IDX_MASK 0x3f > + > +/* REG_RESPONSE_COMMAND */ > +#define RSP_CMD_APP BIT(6) > +#define RSP_CMD_IDX_MASK 0x3f > + > +/* REG_DATA_CONTROL */ > +#define DCR_DATA_FIFO_RESET BIT(8) > +#define DCR_DATA_THRES BIT(7) > +#define DCR_DATA_EN BIT(6) > +#define DCR_DMA_EN BIT(5) > +#define DCR_DATA_WRITE BIT(4) > +#define DCR_BLK_SIZE 0x0f > + > +/* REG_DATA_LENGTH */ > +#define DATA_LEN_MASK 0xffffff > + > +/* REG_STATUS */ > +#define WRITE_PROT BIT(12) > +#define CARD_DETECT BIT(11) > +/* 1-10 below can be sent to either registers, interrupt or clear. */ > +#define CARD_CHANGE BIT(10) > +#define FIFO_ORUN BIT(9) > +#define FIFO_URUN BIT(8) > +#define DATA_END BIT(7) > +#define CMD_SENT BIT(6) > +#define DATA_CRC_OK BIT(5) > +#define RSP_CRC_OK BIT(4) > +#define DATA_TIMEOUT BIT(3) > +#define RSP_TIMEOUT BIT(2) > +#define DATA_CRC_FAIL BIT(1) > +#define RSP_CRC_FAIL BIT(0) > + > +#define MASK_RSP (RSP_TIMEOUT | RSP_CRC_FAIL | \ > + RSP_CRC_OK | CARD_DETECT | CMD_SENT) > + > +#define MASK_DATA (DATA_CRC_OK | DATA_END | \ > + DATA_CRC_FAIL | DATA_TIMEOUT) > + > +#define MASK_INTR_PIO (FIFO_URUN | FIFO_ORUN | CARD_CHANGE) > + > +/* REG_POWER_CONTROL */ > +#define SD_POWER_ON BIT(4) > +#define SD_POWER_MASK 0x0f > + > +/* REG_CLOCK_CONTROL */ > +#define CLK_HISPD BIT(9) > +#define CLK_OFF BIT(8) > +#define CLK_SD BIT(7) > +#define CLK_DIV_MASK 0x7f > + > +/* REG_BUS_WIDTH */ > +#define BUS_WIDTH_8 BIT(2) > +#define BUS_WIDTH_4 BIT(1) > +#define BUS_WIDTH_1 BIT(0) > + > +#define MMC_VDD_360 23 > +#define MIN_POWER (MMC_VDD_360 - SD_POWER_MASK) > +#define MAX_RETRIES 500000 > + > +struct moxart_host { > + spinlock_t lock; > + > + void __iomem *base; > + > + phys_addr_t reg_phys; > + > + struct dma_chan *dma_chan_tx; > + struct dma_chan *dma_chan_rx; > + struct dma_async_tx_descriptor *tx_desc; > + struct mmc_host *mmc; > + struct mmc_request *mrq; > + struct scatterlist *cur_sg; > + struct completion dma_complete; > + struct completion pio_complete; > + > + u32 num_sg; > + u32 data_remain; > + u32 data_len; > + u32 fifo_width; > + u32 timeout; > + u32 rate; > + > + long sysclk; > + > + bool have_dma; > + bool is_removed; > +}; > + > +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->data_remain = host->cur_sg->length; > + > + if (host->data_remain > host->data_len) > + host->data_remain = host->data_len; > +} > + > +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->data_remain = host->cur_sg->length; > + remain = host->data_len - data->bytes_xfered; > + if (remain > 0 && remain < host->data_remain) > + host->data_remain = remain; > + } > + > + return host->num_sg; > +} > + > +static int moxart_wait_for_status(struct moxart_host *host, > + u32 mask, u32 *status) > +{ > + int ret = -ETIMEDOUT; > + u32 i; > + > + for (i = 0; i < MAX_RETRIES; i++) { > + *status = readl(host->base + REG_STATUS); > + if (!(*status & mask)) { > + udelay(5); > + continue; > + } > + writel(*status & mask, host->base + REG_CLEAR); > + ret = 0; > + break; > + } > + > + if (ret) > + dev_err(mmc_dev(host->mmc), "timed out waiting for status\n"); > + > + return ret; > +} > + > + > +static void moxart_send_command(struct moxart_host *host, > + struct mmc_command *cmd) > +{ > + u32 status, cmdctrl; > + > + writel(RSP_TIMEOUT | RSP_CRC_OK | > + RSP_CRC_FAIL | CMD_SENT, host->base + REG_CLEAR); > + writel(cmd->arg, host->base + REG_ARGUMENT); > + > + cmdctrl = cmd->opcode & 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 |= CMD_APP_CMD; > + > + if (cmd->flags & MMC_RSP_PRESENT) > + cmdctrl |= CMD_NEED_RSP; > + > + if (cmd->flags & MMC_RSP_136) > + cmdctrl |= CMD_LONG_RSP; > + > + writel(cmdctrl | CMD_EN, host->base + REG_COMMAND); > + > + if (moxart_wait_for_status(host, MASK_RSP, &status) == -ETIMEDOUT) > + cmd->error = -ETIMEDOUT; > + > + if (status & RSP_TIMEOUT) { > + cmd->error = -ETIMEDOUT; > + return; > + } > + if (status & RSP_CRC_FAIL) { > + cmd->error = -EIO; > + return; > + } > + if (status & RSP_CRC_OK) { > + if (cmd->flags & MMC_RSP_136) { > + cmd->resp[3] = readl(host->base + REG_RESPONSE0); > + cmd->resp[2] = readl(host->base + REG_RESPONSE1); > + cmd->resp[1] = readl(host->base + REG_RESPONSE2); > + cmd->resp[0] = readl(host->base + REG_RESPONSE3); > + } else { > + cmd->resp[0] = readl(host->base + REG_RESPONSE0); > + } > + } > +} > + > +static void moxart_dma_complete(void *param) > +{ > + struct moxart_host *host = param; > + > + complete(&host->dma_complete); > +} > + > +static void moxart_transfer_dma(struct mmc_data *data, struct moxart_host *host) > +{ > + u32 len, dir_data, dir_slave; > + unsigned long dma_time; > + struct dma_async_tx_descriptor *desc = NULL; > + struct dma_chan *dma_chan; > + > + if (host->data_len == data->bytes_xfered) > + return; > + > + if (data->flags & MMC_DATA_WRITE) { > + dma_chan = host->dma_chan_tx; > + dir_data = DMA_TO_DEVICE; > + dir_slave = DMA_MEM_TO_DEV; > + } else { > + dma_chan = host->dma_chan_rx; > + dir_data = DMA_FROM_DEVICE; > + dir_slave = DMA_DEV_TO_MEM; > + } > + > + len = dma_map_sg(dma_chan->device->dev, data->sg, > + data->sg_len, dir_data); > + > + if (len > 0) { > + desc = dmaengine_prep_slave_sg(dma_chan, data->sg, > + len, dir_slave, > + DMA_PREP_INTERRUPT | > + DMA_CTRL_ACK); > + } else { > + dev_err(mmc_dev(host->mmc), "dma_map_sg returned zero length\n"); > + } > + > + if (desc) { > + host->tx_desc = desc; > + desc->callback = moxart_dma_complete; > + desc->callback_param = host; > + dmaengine_submit(desc); > + dma_async_issue_pending(dma_chan); > + } > + > + data->bytes_xfered += host->data_remain; > + > + dma_time = wait_for_completion_interruptible_timeout( > + &host->dma_complete, host->timeout); > + > + dma_unmap_sg(dma_chan->device->dev, > + data->sg, data->sg_len, > + dir_data); > +} > + > + > +static void moxart_transfer_pio(struct moxart_host *host) > +{ > + struct mmc_data *data = host->mrq->cmd->data; > + u32 *sgp, len = 0, remain, status; > + > + if (host->data_len == data->bytes_xfered) > + return; > + > + sgp = sg_virt(host->cur_sg); > + remain = host->data_remain; > + > + if (data->flags & MMC_DATA_WRITE) { > + while (remain > 0) { > + if (moxart_wait_for_status(host, FIFO_URUN, &status) > + == -ETIMEDOUT) { > + data->error = -ETIMEDOUT; > + complete(&host->pio_complete); > + return; > + } > + for (len = 0; len < remain && len < host->fifo_width;) { > + iowrite32(*sgp, host->base + REG_DATA_WINDOW); > + sgp++; > + len += 4; > + } > + remain -= len; > + } > + > + } else { > + while (remain > 0) { > + if (moxart_wait_for_status(host, FIFO_ORUN, &status) > + == -ETIMEDOUT) { > + data->error = -ETIMEDOUT; > + complete(&host->pio_complete); > + return; > + } > + for (len = 0; len < remain && len < host->fifo_width;) { > + /* SCR data must be read in big endian. */ > + if (data->mrq->cmd->opcode == SD_APP_SEND_SCR) > + *sgp = ioread32be(host->base + > + REG_DATA_WINDOW); > + else > + *sgp = ioread32(host->base + > + REG_DATA_WINDOW); > + sgp++; > + len += 4; > + } > + remain -= len; > + } > + } > + > + data->bytes_xfered += host->data_remain - remain; > + host->data_remain = remain; > + > + if (host->data_len != data->bytes_xfered) > + moxart_next_sg(host); > + else > + complete(&host->pio_complete); > +} > + > +static void moxart_prepare_data(struct moxart_host *host) > +{ > + struct mmc_data *data = host->mrq->cmd->data; > + u32 datactrl; > + int blksz_bits; > + > + if (!data) > + return; > + > + host->data_len = data->blocks * data->blksz; > + blksz_bits = ffs(data->blksz) - 1; > + BUG_ON(1 << blksz_bits != data->blksz); > + > + moxart_init_sg(host, data); > + > + datactrl = DCR_DATA_EN | (blksz_bits & DCR_BLK_SIZE); > + > + if (data->flags & MMC_DATA_WRITE) > + datactrl |= DCR_DATA_WRITE; > + > + if ((host->data_len > host->fifo_width) && host->have_dma) > + datactrl |= DCR_DMA_EN; > + > + writel(DCR_DATA_FIFO_RESET, host->base + REG_DATA_CONTROL); > + writel(MASK_DATA | FIFO_URUN | FIFO_ORUN, host->base + REG_CLEAR); > + writel(host->rate, host->base + REG_DATA_TIMER); > + writel(host->data_len, host->base + REG_DATA_LENGTH); > + writel(datactrl, host->base + REG_DATA_CONTROL); > +} > + > +static void moxart_request(struct mmc_host *mmc, struct mmc_request *mrq) > +{ > + struct moxart_host *host = mmc_priv(mmc); > + unsigned long pio_time, flags; > + u32 status; > + > + spin_lock_irqsave(&host->lock, flags); > + > + init_completion(&host->dma_complete); > + init_completion(&host->pio_complete); > + > + host->mrq = mrq; > + > + if (readl(host->base + REG_STATUS) & CARD_DETECT) { > + mrq->cmd->error = -ETIMEDOUT; > + goto request_done; > + } > + > + moxart_prepare_data(host); > + moxart_send_command(host, host->mrq->cmd); > + > + if (mrq->cmd->data) { > + if ((host->data_len > host->fifo_width) && host->have_dma) { > + > + writel(CARD_CHANGE, host->base + REG_INTERRUPT_MASK); > + > + spin_unlock_irqrestore(&host->lock, flags); > + > + moxart_transfer_dma(mrq->cmd->data, host); > + > + spin_lock_irqsave(&host->lock, flags); > + } else { > + > + writel(MASK_INTR_PIO, host->base + REG_INTERRUPT_MASK); > + > + spin_unlock_irqrestore(&host->lock, flags); > + > + /* PIO transfers start from interrupt. */ > + pio_time = wait_for_completion_interruptible_timeout( > + &host->pio_complete, host->timeout); > + > + spin_lock_irqsave(&host->lock, flags); > + } > + > + if (host->is_removed) { > + dev_err(mmc_dev(host->mmc), "card removed\n"); > + mrq->cmd->error = -ETIMEDOUT; > + goto request_done; > + } > + > + if (moxart_wait_for_status(host, MASK_DATA, &status) > + == -ETIMEDOUT) { > + mrq->cmd->data->error = -ETIMEDOUT; > + goto request_done; > + } > + > + if (status & DATA_CRC_FAIL) > + mrq->cmd->data->error = -ETIMEDOUT; > + > + 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; > + u32 status; > + unsigned long flags; > + > + spin_lock_irqsave(&host->lock, flags); > + > + status = readl(host->base + REG_STATUS); > + if (status & CARD_CHANGE) { > + host->is_removed = status & CARD_DETECT; > + if (host->is_removed && host->have_dma) { > + dmaengine_terminate_all(host->dma_chan_tx); > + dmaengine_terminate_all(host->dma_chan_rx); > + } > + host->mrq = NULL; > + writel(MASK_INTR_PIO, host->base + REG_CLEAR); > + writel(CARD_CHANGE, host->base + REG_INTERRUPT_MASK); > + mmc_detect_change(host->mmc, 0); > + } > + if (status & (FIFO_ORUN | FIFO_URUN) && host->mrq) > + 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; > + u8 power, div; > + u32 ctrl; > + > + spin_lock_irqsave(&host->lock, flags); > + > + if (ios->clock) { > + for (div = 0; div < CLK_DIV_MASK; ++div) { > + if (ios->clock >= host->sysclk / (2 * (div + 1))) > + break; > + } > + ctrl = CLK_SD | div; > + host->rate = host->sysclk / (2 * (div + 1)); > + if (host->rate > host->sysclk) > + ctrl |= CLK_HISPD; > + writel(ctrl, host->base + REG_CLOCK_CONTROL); > + } > + > + if (ios->power_mode == MMC_POWER_OFF) { > + writel(readl(host->base + REG_POWER_CONTROL) & ~SD_POWER_ON, > + host->base + REG_POWER_CONTROL); > + } else { > + if (ios->vdd < MIN_POWER) > + power = 0; > + else > + power = ios->vdd - MIN_POWER; > + > + writel(SD_POWER_ON | (u32) power, > + host->base + REG_POWER_CONTROL); > + } > + > + switch (ios->bus_width) { > + case MMC_BUS_WIDTH_4: > + writel(BUS_WIDTH_4, host->base + REG_BUS_WIDTH); > + break; > + case MMC_BUS_WIDTH_8: > + writel(BUS_WIDTH_8, host->base + REG_BUS_WIDTH); > + break; > + default: > + writel(BUS_WIDTH_1, host->base + REG_BUS_WIDTH); > + break; > + } > + > + spin_unlock_irqrestore(&host->lock, flags); > +} > + > + > +static int moxart_get_ro(struct mmc_host *mmc) > +{ > + struct moxart_host *host = mmc_priv(mmc); > + > + return !!(readl(host->base + REG_STATUS) & WRITE_PROT); > +} > + > +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; > + struct dma_slave_config cfg; > + struct clk *clk; > + void __iomem *reg_mmc; > + dma_cap_mask_t mask; > + int irq, ret; > + u32 i; > + > + mmc = mmc_alloc_host(sizeof(struct moxart_host), dev); > + if (!mmc) { > + dev_err(dev, "mmc_alloc_host failed\n"); > + ret = -ENOMEM; > + goto out; > + } > + > + ret = of_address_to_resource(node, 0, &res_mmc); > + if (ret) { > + dev_err(dev, "of_address_to_resource failed\n"); > + goto out; > + } > + > + irq = irq_of_parse_and_map(node, 0); > + if (irq <= 0) { > + dev_err(dev, "irq_of_parse_and_map failed\n"); > + ret = -EINVAL; > + goto out; > + } > + > + clk = of_clk_get(node, 0); > + if (IS_ERR(clk)) { > + dev_err(dev, "of_clk_get failed\n"); > + ret = PTR_ERR(clk); > + goto out; > + } > + > + reg_mmc = devm_ioremap_resource(dev, &res_mmc); > + if (IS_ERR(reg_mmc)) { > + ret = PTR_ERR(reg_mmc); > + goto out; > + } > + > + mmc_of_parse(mmc); > + > + dma_cap_zero(mask); > + dma_cap_set(DMA_SLAVE, mask); > + > + host = mmc_priv(mmc); > + host->mmc = mmc; > + host->base = reg_mmc; > + host->reg_phys = res_mmc.start; > + host->timeout = msecs_to_jiffies(1000); > + host->sysclk = clk_get_rate(clk); > + host->fifo_width = readl(host->base + REG_FEATURE) << 2; > + host->dma_chan_tx = of_dma_request_slave_channel(node, "tx"); > + host->dma_chan_rx = of_dma_request_slave_channel(node, "rx"); > + > + spin_lock_init(&host->lock); > + > + mmc->ops = &moxart_ops; > + mmc->f_max = DIV_ROUND_CLOSEST(host->sysclk, 2); > + mmc->f_min = DIV_ROUND_CLOSEST(host->sysclk, CLK_DIV_MASK * 2); > + mmc->ocr_avail = 0xffff00; /* Support 2.0v - 3.6v power. */ > + > + if (IS_ERR(host->dma_chan_tx) || IS_ERR(host->dma_chan_rx)) { > + dev_dbg(dev, "PIO mode transfer enabled\n"); > + host->have_dma = false; > + } else { > + dev_dbg(dev, "DMA channels found (%p,%p)\n", > + host->dma_chan_tx, host->dma_chan_rx); > + host->have_dma = true; > + > + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; > + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; > + > + cfg.direction = DMA_MEM_TO_DEV; > + cfg.src_addr = 0; > + cfg.dst_addr = host->reg_phys + REG_DATA_WINDOW; > + dmaengine_slave_config(host->dma_chan_tx, &cfg); > + > + cfg.direction = DMA_DEV_TO_MEM; > + cfg.src_addr = host->reg_phys + REG_DATA_WINDOW; > + cfg.dst_addr = 0; > + dmaengine_slave_config(host->dma_chan_rx, &cfg); > + } > + > + switch ((readl(host->base + REG_BUS_WIDTH) >> 3) & 3) { > + case 1: > + mmc->caps |= MMC_CAP_4_BIT_DATA; > + break; > + case 2: > + mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA; > + break; > + default: > + break; > + } > + > + writel(0, host->base + REG_INTERRUPT_MASK); > + > + writel(CMD_SDC_RESET, host->base + REG_COMMAND); > + for (i = 0; i < MAX_RETRIES; i++) { > + if (!(readl(host->base + REG_COMMAND) & CMD_SDC_RESET)) > + break; > + udelay(5); > + } > + > + ret = devm_request_irq(dev, irq, moxart_irq, 0, "moxart-mmc", host); > + if (ret) > + goto out; > + > + dev_set_drvdata(dev, mmc); > + mmc_add_host(mmc); > + > + dev_dbg(dev, "IRQ=%d, FIFO is %d bytes\n", irq, host->fifo_width); > + > + return 0; > + > +out: > + if (mmc) > + mmc_free_host(mmc); > + return ret; > +} > + > +static int moxart_remove(struct platform_device *pdev) > +{ > + struct mmc_host *mmc = dev_get_drvdata(&pdev->dev); > + struct moxart_host *host = mmc_priv(mmc); > + > + dev_set_drvdata(&pdev->dev, NULL); > + > + if (mmc) { > + if (!IS_ERR(host->dma_chan_tx)) > + dma_release_channel(host->dma_chan_tx); > + if (!IS_ERR(host->dma_chan_rx)) > + dma_release_channel(host->dma_chan_rx); > + mmc_remove_host(mmc); > + mmc_free_host(mmc); > + > + writel(0, host->base + REG_INTERRUPT_MASK); > + writel(0, host->base + REG_POWER_CONTROL); > + writel(readl(host->base + REG_CLOCK_CONTROL) | CLK_OFF, > + host->base + REG_CLOCK_CONTROL); > + } > + > + kfree(host); > + > + return 0; > +} > + > +static const struct of_device_id moxart_mmc_match[] = { > + { .compatible = "moxa,moxart-mmc" }, > + { .compatible = "faraday,ftsdc010" }, > + { } > +}; > + > +static struct platform_driver moxart_mmc_driver = { > + .probe = moxart_probe, > + .remove = moxart_remove, > + .driver = { > + .name = "mmc-moxart", > + .owner = THIS_MODULE, > + .of_match_table = moxart_mmc_match, > + }, > +}; > +module_platform_driver(moxart_mmc_driver); > + > +MODULE_ALIAS("platform:mmc-moxart"); > +MODULE_DESCRIPTION("MOXA ART MMC driver"); > +MODULE_LICENSE("GPL v2"); > +MODULE_AUTHOR("Jonas Jensen <jonas.jensen@xxxxxxxxx>"); > -- > 1.8.2.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
