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5d15cbf635
'dma_request_chan()' calls should be balanced by a corresponding
'dma_release_channel()' call.
Add the missing call both in the error handling path of the probe function
and in the remove function.
Fixes: ff65ffe46d
("mmc: Add Actions Semi Owl SoCs SD/MMC driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/20201209194202.54099-1-christophe.jaillet@wanadoo.fr
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
706 lines
18 KiB
C
706 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Actions Semi Owl SoCs SD/MMC driver
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*
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* Copyright (c) 2014 Actions Semi Inc.
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* Copyright (c) 2019 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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*
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* TODO: SDIO support
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-direction.h>
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#include <linux/dma-mapping.h>
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#include <linux/interrupt.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/slot-gpio.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/reset.h>
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#include <linux/spinlock.h>
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/*
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* SDC registers
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*/
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#define OWL_REG_SD_EN 0x0000
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#define OWL_REG_SD_CTL 0x0004
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#define OWL_REG_SD_STATE 0x0008
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#define OWL_REG_SD_CMD 0x000c
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#define OWL_REG_SD_ARG 0x0010
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#define OWL_REG_SD_RSPBUF0 0x0014
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#define OWL_REG_SD_RSPBUF1 0x0018
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#define OWL_REG_SD_RSPBUF2 0x001c
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#define OWL_REG_SD_RSPBUF3 0x0020
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#define OWL_REG_SD_RSPBUF4 0x0024
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#define OWL_REG_SD_DAT 0x0028
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#define OWL_REG_SD_BLK_SIZE 0x002c
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#define OWL_REG_SD_BLK_NUM 0x0030
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#define OWL_REG_SD_BUF_SIZE 0x0034
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/* SD_EN Bits */
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#define OWL_SD_EN_RANE BIT(31)
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#define OWL_SD_EN_RAN_SEED(x) (((x) & 0x3f) << 24)
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#define OWL_SD_EN_S18EN BIT(12)
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#define OWL_SD_EN_RESE BIT(10)
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#define OWL_SD_EN_DAT1_S BIT(9)
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#define OWL_SD_EN_CLK_S BIT(8)
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#define OWL_SD_ENABLE BIT(7)
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#define OWL_SD_EN_BSEL BIT(6)
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#define OWL_SD_EN_SDIOEN BIT(3)
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#define OWL_SD_EN_DDREN BIT(2)
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#define OWL_SD_EN_DATAWID(x) (((x) & 0x3) << 0)
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/* SD_CTL Bits */
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#define OWL_SD_CTL_TOUTEN BIT(31)
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#define OWL_SD_CTL_TOUTCNT(x) (((x) & 0x7f) << 24)
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#define OWL_SD_CTL_DELAY_MSK GENMASK(23, 16)
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#define OWL_SD_CTL_RDELAY(x) (((x) & 0xf) << 20)
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#define OWL_SD_CTL_WDELAY(x) (((x) & 0xf) << 16)
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#define OWL_SD_CTL_CMDLEN BIT(13)
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#define OWL_SD_CTL_SCC BIT(12)
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#define OWL_SD_CTL_TCN(x) (((x) & 0xf) << 8)
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#define OWL_SD_CTL_TS BIT(7)
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#define OWL_SD_CTL_LBE BIT(6)
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#define OWL_SD_CTL_C7EN BIT(5)
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#define OWL_SD_CTL_TM(x) (((x) & 0xf) << 0)
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#define OWL_SD_DELAY_LOW_CLK 0x0f
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#define OWL_SD_DELAY_MID_CLK 0x0a
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#define OWL_SD_DELAY_HIGH_CLK 0x09
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#define OWL_SD_RDELAY_DDR50 0x0a
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#define OWL_SD_WDELAY_DDR50 0x08
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/* SD_STATE Bits */
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#define OWL_SD_STATE_DAT1BS BIT(18)
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#define OWL_SD_STATE_SDIOB_P BIT(17)
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#define OWL_SD_STATE_SDIOB_EN BIT(16)
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#define OWL_SD_STATE_TOUTE BIT(15)
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#define OWL_SD_STATE_BAEP BIT(14)
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#define OWL_SD_STATE_MEMRDY BIT(12)
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#define OWL_SD_STATE_CMDS BIT(11)
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#define OWL_SD_STATE_DAT1AS BIT(10)
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#define OWL_SD_STATE_SDIOA_P BIT(9)
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#define OWL_SD_STATE_SDIOA_EN BIT(8)
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#define OWL_SD_STATE_DAT0S BIT(7)
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#define OWL_SD_STATE_TEIE BIT(6)
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#define OWL_SD_STATE_TEI BIT(5)
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#define OWL_SD_STATE_CLNR BIT(4)
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#define OWL_SD_STATE_CLC BIT(3)
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#define OWL_SD_STATE_WC16ER BIT(2)
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#define OWL_SD_STATE_RC16ER BIT(1)
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#define OWL_SD_STATE_CRC7ER BIT(0)
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#define OWL_CMD_TIMEOUT_MS 30000
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struct owl_mmc_host {
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struct device *dev;
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struct reset_control *reset;
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void __iomem *base;
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struct clk *clk;
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struct completion sdc_complete;
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spinlock_t lock;
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int irq;
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u32 clock;
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bool ddr_50;
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enum dma_data_direction dma_dir;
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struct dma_chan *dma;
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struct dma_async_tx_descriptor *desc;
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struct dma_slave_config dma_cfg;
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struct completion dma_complete;
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struct mmc_host *mmc;
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struct mmc_request *mrq;
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struct mmc_command *cmd;
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struct mmc_data *data;
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};
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static void owl_mmc_update_reg(void __iomem *reg, unsigned int val, bool state)
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{
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unsigned int regval;
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regval = readl(reg);
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if (state)
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regval |= val;
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else
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regval &= ~val;
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writel(regval, reg);
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}
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static irqreturn_t owl_irq_handler(int irq, void *devid)
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{
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struct owl_mmc_host *owl_host = devid;
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u32 state;
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spin_lock(&owl_host->lock);
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state = readl(owl_host->base + OWL_REG_SD_STATE);
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if (state & OWL_SD_STATE_TEI) {
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state = readl(owl_host->base + OWL_REG_SD_STATE);
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state |= OWL_SD_STATE_TEI;
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writel(state, owl_host->base + OWL_REG_SD_STATE);
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complete(&owl_host->sdc_complete);
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}
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spin_unlock(&owl_host->lock);
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return IRQ_HANDLED;
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}
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static void owl_mmc_finish_request(struct owl_mmc_host *owl_host)
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{
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struct mmc_request *mrq = owl_host->mrq;
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struct mmc_data *data = mrq->data;
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/* Should never be NULL */
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WARN_ON(!mrq);
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owl_host->mrq = NULL;
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if (data)
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dma_unmap_sg(owl_host->dma->device->dev, data->sg, data->sg_len,
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owl_host->dma_dir);
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/* Finally finish request */
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mmc_request_done(owl_host->mmc, mrq);
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}
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static void owl_mmc_send_cmd(struct owl_mmc_host *owl_host,
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struct mmc_command *cmd,
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struct mmc_data *data)
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{
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unsigned long timeout;
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u32 mode, state, resp[2];
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u32 cmd_rsp_mask = 0;
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init_completion(&owl_host->sdc_complete);
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switch (mmc_resp_type(cmd)) {
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case MMC_RSP_NONE:
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mode = OWL_SD_CTL_TM(0);
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break;
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case MMC_RSP_R1:
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if (data) {
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if (data->flags & MMC_DATA_READ)
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mode = OWL_SD_CTL_TM(4);
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else
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mode = OWL_SD_CTL_TM(5);
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} else {
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mode = OWL_SD_CTL_TM(1);
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}
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cmd_rsp_mask = OWL_SD_STATE_CLNR | OWL_SD_STATE_CRC7ER;
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break;
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case MMC_RSP_R1B:
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mode = OWL_SD_CTL_TM(3);
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cmd_rsp_mask = OWL_SD_STATE_CLNR | OWL_SD_STATE_CRC7ER;
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break;
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case MMC_RSP_R2:
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mode = OWL_SD_CTL_TM(2);
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cmd_rsp_mask = OWL_SD_STATE_CLNR | OWL_SD_STATE_CRC7ER;
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break;
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case MMC_RSP_R3:
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mode = OWL_SD_CTL_TM(1);
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cmd_rsp_mask = OWL_SD_STATE_CLNR;
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break;
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default:
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dev_warn(owl_host->dev, "Unknown MMC command\n");
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cmd->error = -EINVAL;
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return;
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}
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/* Keep current WDELAY and RDELAY */
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mode |= (readl(owl_host->base + OWL_REG_SD_CTL) & (0xff << 16));
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/* Start to send corresponding command type */
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writel(cmd->arg, owl_host->base + OWL_REG_SD_ARG);
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writel(cmd->opcode, owl_host->base + OWL_REG_SD_CMD);
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/* Set LBE to send clk at the end of last read block */
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if (data) {
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mode |= (OWL_SD_CTL_TS | OWL_SD_CTL_LBE | 0x64000000);
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} else {
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mode &= ~(OWL_SD_CTL_TOUTEN | OWL_SD_CTL_LBE);
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mode |= OWL_SD_CTL_TS;
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}
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owl_host->cmd = cmd;
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/* Start transfer */
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writel(mode, owl_host->base + OWL_REG_SD_CTL);
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if (data)
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return;
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timeout = msecs_to_jiffies(cmd->busy_timeout ? cmd->busy_timeout :
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OWL_CMD_TIMEOUT_MS);
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if (!wait_for_completion_timeout(&owl_host->sdc_complete, timeout)) {
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dev_err(owl_host->dev, "CMD interrupt timeout\n");
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cmd->error = -ETIMEDOUT;
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return;
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}
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state = readl(owl_host->base + OWL_REG_SD_STATE);
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if (mmc_resp_type(cmd) & MMC_RSP_PRESENT) {
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if (cmd_rsp_mask & state) {
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if (state & OWL_SD_STATE_CLNR) {
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dev_err(owl_host->dev, "Error CMD_NO_RSP\n");
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cmd->error = -EILSEQ;
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return;
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}
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if (state & OWL_SD_STATE_CRC7ER) {
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dev_err(owl_host->dev, "Error CMD_RSP_CRC\n");
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cmd->error = -EILSEQ;
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return;
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}
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}
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if (mmc_resp_type(cmd) & MMC_RSP_136) {
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cmd->resp[3] = readl(owl_host->base + OWL_REG_SD_RSPBUF0);
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cmd->resp[2] = readl(owl_host->base + OWL_REG_SD_RSPBUF1);
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cmd->resp[1] = readl(owl_host->base + OWL_REG_SD_RSPBUF2);
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cmd->resp[0] = readl(owl_host->base + OWL_REG_SD_RSPBUF3);
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} else {
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resp[0] = readl(owl_host->base + OWL_REG_SD_RSPBUF0);
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resp[1] = readl(owl_host->base + OWL_REG_SD_RSPBUF1);
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cmd->resp[0] = resp[1] << 24 | resp[0] >> 8;
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cmd->resp[1] = resp[1] >> 8;
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}
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}
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}
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static void owl_mmc_dma_complete(void *param)
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{
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struct owl_mmc_host *owl_host = param;
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struct mmc_data *data = owl_host->data;
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if (data)
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complete(&owl_host->dma_complete);
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}
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static int owl_mmc_prepare_data(struct owl_mmc_host *owl_host,
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struct mmc_data *data)
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{
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u32 total;
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owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN, OWL_SD_EN_BSEL,
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true);
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writel(data->blocks, owl_host->base + OWL_REG_SD_BLK_NUM);
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writel(data->blksz, owl_host->base + OWL_REG_SD_BLK_SIZE);
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total = data->blksz * data->blocks;
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if (total < 512)
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writel(total, owl_host->base + OWL_REG_SD_BUF_SIZE);
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else
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writel(512, owl_host->base + OWL_REG_SD_BUF_SIZE);
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if (data->flags & MMC_DATA_WRITE) {
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owl_host->dma_dir = DMA_TO_DEVICE;
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owl_host->dma_cfg.direction = DMA_MEM_TO_DEV;
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} else {
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owl_host->dma_dir = DMA_FROM_DEVICE;
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owl_host->dma_cfg.direction = DMA_DEV_TO_MEM;
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}
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dma_map_sg(owl_host->dma->device->dev, data->sg,
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data->sg_len, owl_host->dma_dir);
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dmaengine_slave_config(owl_host->dma, &owl_host->dma_cfg);
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owl_host->desc = dmaengine_prep_slave_sg(owl_host->dma, data->sg,
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data->sg_len,
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owl_host->dma_cfg.direction,
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DMA_PREP_INTERRUPT |
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DMA_CTRL_ACK);
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if (!owl_host->desc) {
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dev_err(owl_host->dev, "Can't prepare slave sg\n");
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return -EBUSY;
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}
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owl_host->data = data;
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owl_host->desc->callback = owl_mmc_dma_complete;
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owl_host->desc->callback_param = (void *)owl_host;
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data->error = 0;
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return 0;
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}
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static void owl_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
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{
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struct owl_mmc_host *owl_host = mmc_priv(mmc);
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struct mmc_data *data = mrq->data;
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int ret;
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owl_host->mrq = mrq;
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if (mrq->data) {
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ret = owl_mmc_prepare_data(owl_host, data);
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if (ret < 0) {
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data->error = ret;
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goto err_out;
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}
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init_completion(&owl_host->dma_complete);
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dmaengine_submit(owl_host->desc);
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dma_async_issue_pending(owl_host->dma);
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}
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owl_mmc_send_cmd(owl_host, mrq->cmd, data);
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if (data) {
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if (!wait_for_completion_timeout(&owl_host->sdc_complete,
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10 * HZ)) {
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dev_err(owl_host->dev, "CMD interrupt timeout\n");
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mrq->cmd->error = -ETIMEDOUT;
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dmaengine_terminate_all(owl_host->dma);
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goto err_out;
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}
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if (!wait_for_completion_timeout(&owl_host->dma_complete,
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5 * HZ)) {
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dev_err(owl_host->dev, "DMA interrupt timeout\n");
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mrq->cmd->error = -ETIMEDOUT;
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dmaengine_terminate_all(owl_host->dma);
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goto err_out;
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}
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if (data->stop)
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owl_mmc_send_cmd(owl_host, data->stop, NULL);
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data->bytes_xfered = data->blocks * data->blksz;
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}
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err_out:
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owl_mmc_finish_request(owl_host);
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}
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static int owl_mmc_set_clk_rate(struct owl_mmc_host *owl_host,
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unsigned int rate)
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{
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unsigned long clk_rate;
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int ret;
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u32 reg;
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reg = readl(owl_host->base + OWL_REG_SD_CTL);
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reg &= ~OWL_SD_CTL_DELAY_MSK;
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/* Set RDELAY and WDELAY based on the clock */
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if (rate <= 1000000) {
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writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_DELAY_LOW_CLK) |
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OWL_SD_CTL_WDELAY(OWL_SD_DELAY_LOW_CLK),
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owl_host->base + OWL_REG_SD_CTL);
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} else if ((rate > 1000000) && (rate <= 26000000)) {
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writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_DELAY_MID_CLK) |
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OWL_SD_CTL_WDELAY(OWL_SD_DELAY_MID_CLK),
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owl_host->base + OWL_REG_SD_CTL);
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} else if ((rate > 26000000) && (rate <= 52000000) && !owl_host->ddr_50) {
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writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_DELAY_HIGH_CLK) |
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OWL_SD_CTL_WDELAY(OWL_SD_DELAY_HIGH_CLK),
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owl_host->base + OWL_REG_SD_CTL);
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/* DDR50 mode has special delay chain */
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} else if ((rate > 26000000) && (rate <= 52000000) && owl_host->ddr_50) {
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writel(reg | OWL_SD_CTL_RDELAY(OWL_SD_RDELAY_DDR50) |
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OWL_SD_CTL_WDELAY(OWL_SD_WDELAY_DDR50),
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owl_host->base + OWL_REG_SD_CTL);
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} else {
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dev_err(owl_host->dev, "SD clock rate not supported\n");
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return -EINVAL;
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}
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clk_rate = clk_round_rate(owl_host->clk, rate << 1);
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ret = clk_set_rate(owl_host->clk, clk_rate);
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return ret;
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}
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static void owl_mmc_set_clk(struct owl_mmc_host *owl_host, struct mmc_ios *ios)
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{
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if (!ios->clock)
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return;
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owl_host->clock = ios->clock;
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owl_mmc_set_clk_rate(owl_host, ios->clock);
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}
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static void owl_mmc_set_bus_width(struct owl_mmc_host *owl_host,
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struct mmc_ios *ios)
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{
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u32 reg;
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reg = readl(owl_host->base + OWL_REG_SD_EN);
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reg &= ~0x03;
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switch (ios->bus_width) {
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case MMC_BUS_WIDTH_1:
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break;
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case MMC_BUS_WIDTH_4:
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reg |= OWL_SD_EN_DATAWID(1);
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break;
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case MMC_BUS_WIDTH_8:
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reg |= OWL_SD_EN_DATAWID(2);
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break;
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}
|
|
|
|
writel(reg, owl_host->base + OWL_REG_SD_EN);
|
|
}
|
|
|
|
static void owl_mmc_ctr_reset(struct owl_mmc_host *owl_host)
|
|
{
|
|
reset_control_assert(owl_host->reset);
|
|
udelay(20);
|
|
reset_control_deassert(owl_host->reset);
|
|
}
|
|
|
|
static void owl_mmc_power_on(struct owl_mmc_host *owl_host)
|
|
{
|
|
u32 mode;
|
|
|
|
init_completion(&owl_host->sdc_complete);
|
|
|
|
/* Enable transfer end IRQ */
|
|
owl_mmc_update_reg(owl_host->base + OWL_REG_SD_STATE,
|
|
OWL_SD_STATE_TEIE, true);
|
|
|
|
/* Send init clk */
|
|
mode = (readl(owl_host->base + OWL_REG_SD_CTL) & (0xff << 16));
|
|
mode |= OWL_SD_CTL_TS | OWL_SD_CTL_TCN(5) | OWL_SD_CTL_TM(8);
|
|
writel(mode, owl_host->base + OWL_REG_SD_CTL);
|
|
|
|
if (!wait_for_completion_timeout(&owl_host->sdc_complete, HZ)) {
|
|
dev_err(owl_host->dev, "CMD interrupt timeout\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void owl_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct owl_mmc_host *owl_host = mmc_priv(mmc);
|
|
|
|
switch (ios->power_mode) {
|
|
case MMC_POWER_UP:
|
|
dev_dbg(owl_host->dev, "Powering card up\n");
|
|
|
|
/* Reset the SDC controller to clear all previous states */
|
|
owl_mmc_ctr_reset(owl_host);
|
|
clk_prepare_enable(owl_host->clk);
|
|
writel(OWL_SD_ENABLE | OWL_SD_EN_RESE,
|
|
owl_host->base + OWL_REG_SD_EN);
|
|
|
|
break;
|
|
|
|
case MMC_POWER_ON:
|
|
dev_dbg(owl_host->dev, "Powering card on\n");
|
|
owl_mmc_power_on(owl_host);
|
|
|
|
break;
|
|
|
|
case MMC_POWER_OFF:
|
|
dev_dbg(owl_host->dev, "Powering card off\n");
|
|
clk_disable_unprepare(owl_host->clk);
|
|
|
|
return;
|
|
|
|
default:
|
|
dev_dbg(owl_host->dev, "Ignoring unknown card power state\n");
|
|
break;
|
|
}
|
|
|
|
if (ios->clock != owl_host->clock)
|
|
owl_mmc_set_clk(owl_host, ios);
|
|
|
|
owl_mmc_set_bus_width(owl_host, ios);
|
|
|
|
/* Enable DDR mode if requested */
|
|
if (ios->timing == MMC_TIMING_UHS_DDR50) {
|
|
owl_host->ddr_50 = true;
|
|
owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN,
|
|
OWL_SD_EN_DDREN, true);
|
|
} else {
|
|
owl_host->ddr_50 = false;
|
|
}
|
|
}
|
|
|
|
static int owl_mmc_start_signal_voltage_switch(struct mmc_host *mmc,
|
|
struct mmc_ios *ios)
|
|
{
|
|
struct owl_mmc_host *owl_host = mmc_priv(mmc);
|
|
|
|
/* It is enough to change the pad ctrl bit for voltage switch */
|
|
switch (ios->signal_voltage) {
|
|
case MMC_SIGNAL_VOLTAGE_330:
|
|
owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN,
|
|
OWL_SD_EN_S18EN, false);
|
|
break;
|
|
case MMC_SIGNAL_VOLTAGE_180:
|
|
owl_mmc_update_reg(owl_host->base + OWL_REG_SD_EN,
|
|
OWL_SD_EN_S18EN, true);
|
|
break;
|
|
default:
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct mmc_host_ops owl_mmc_ops = {
|
|
.request = owl_mmc_request,
|
|
.set_ios = owl_mmc_set_ios,
|
|
.get_ro = mmc_gpio_get_ro,
|
|
.get_cd = mmc_gpio_get_cd,
|
|
.start_signal_voltage_switch = owl_mmc_start_signal_voltage_switch,
|
|
};
|
|
|
|
static int owl_mmc_probe(struct platform_device *pdev)
|
|
{
|
|
struct owl_mmc_host *owl_host;
|
|
struct mmc_host *mmc;
|
|
struct resource *res;
|
|
int ret;
|
|
|
|
mmc = mmc_alloc_host(sizeof(struct owl_mmc_host), &pdev->dev);
|
|
if (!mmc) {
|
|
dev_err(&pdev->dev, "mmc alloc host failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
platform_set_drvdata(pdev, mmc);
|
|
|
|
owl_host = mmc_priv(mmc);
|
|
owl_host->dev = &pdev->dev;
|
|
owl_host->mmc = mmc;
|
|
spin_lock_init(&owl_host->lock);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
owl_host->base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(owl_host->base)) {
|
|
dev_err(&pdev->dev, "Failed to remap registers\n");
|
|
ret = PTR_ERR(owl_host->base);
|
|
goto err_free_host;
|
|
}
|
|
|
|
owl_host->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(owl_host->clk)) {
|
|
dev_err(&pdev->dev, "No clock defined\n");
|
|
ret = PTR_ERR(owl_host->clk);
|
|
goto err_free_host;
|
|
}
|
|
|
|
owl_host->reset = devm_reset_control_get_exclusive(&pdev->dev, NULL);
|
|
if (IS_ERR(owl_host->reset)) {
|
|
dev_err(&pdev->dev, "Could not get reset control\n");
|
|
ret = PTR_ERR(owl_host->reset);
|
|
goto err_free_host;
|
|
}
|
|
|
|
mmc->ops = &owl_mmc_ops;
|
|
mmc->max_blk_count = 512;
|
|
mmc->max_blk_size = 512;
|
|
mmc->max_segs = 256;
|
|
mmc->max_seg_size = 262144;
|
|
mmc->max_req_size = 262144;
|
|
/* 100kHz ~ 52MHz */
|
|
mmc->f_min = 100000;
|
|
mmc->f_max = 52000000;
|
|
mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
|
|
MMC_CAP_4_BIT_DATA;
|
|
mmc->caps2 = (MMC_CAP2_BOOTPART_NOACC | MMC_CAP2_NO_SDIO);
|
|
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34 |
|
|
MMC_VDD_165_195;
|
|
|
|
ret = mmc_of_parse(mmc);
|
|
if (ret)
|
|
goto err_free_host;
|
|
|
|
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
|
|
pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
|
|
owl_host->dma = dma_request_chan(&pdev->dev, "mmc");
|
|
if (IS_ERR(owl_host->dma)) {
|
|
dev_err(owl_host->dev, "Failed to get external DMA channel.\n");
|
|
ret = PTR_ERR(owl_host->dma);
|
|
goto err_free_host;
|
|
}
|
|
|
|
dev_info(&pdev->dev, "Using %s for DMA transfers\n",
|
|
dma_chan_name(owl_host->dma));
|
|
|
|
owl_host->dma_cfg.src_addr = res->start + OWL_REG_SD_DAT;
|
|
owl_host->dma_cfg.dst_addr = res->start + OWL_REG_SD_DAT;
|
|
owl_host->dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
owl_host->dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
owl_host->dma_cfg.device_fc = false;
|
|
|
|
owl_host->irq = platform_get_irq(pdev, 0);
|
|
if (owl_host->irq < 0) {
|
|
ret = -EINVAL;
|
|
goto err_release_channel;
|
|
}
|
|
|
|
ret = devm_request_irq(&pdev->dev, owl_host->irq, owl_irq_handler,
|
|
0, dev_name(&pdev->dev), owl_host);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to request irq %d\n",
|
|
owl_host->irq);
|
|
goto err_release_channel;
|
|
}
|
|
|
|
ret = mmc_add_host(mmc);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to add host\n");
|
|
goto err_release_channel;
|
|
}
|
|
|
|
dev_dbg(&pdev->dev, "Owl MMC Controller Initialized\n");
|
|
|
|
return 0;
|
|
|
|
err_release_channel:
|
|
dma_release_channel(owl_host->dma);
|
|
err_free_host:
|
|
mmc_free_host(mmc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int owl_mmc_remove(struct platform_device *pdev)
|
|
{
|
|
struct mmc_host *mmc = platform_get_drvdata(pdev);
|
|
struct owl_mmc_host *owl_host = mmc_priv(mmc);
|
|
|
|
mmc_remove_host(mmc);
|
|
disable_irq(owl_host->irq);
|
|
dma_release_channel(owl_host->dma);
|
|
mmc_free_host(mmc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id owl_mmc_of_match[] = {
|
|
{.compatible = "actions,owl-mmc",},
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, owl_mmc_of_match);
|
|
|
|
static struct platform_driver owl_mmc_driver = {
|
|
.driver = {
|
|
.name = "owl_mmc",
|
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
|
|
.of_match_table = owl_mmc_of_match,
|
|
},
|
|
.probe = owl_mmc_probe,
|
|
.remove = owl_mmc_remove,
|
|
};
|
|
module_platform_driver(owl_mmc_driver);
|
|
|
|
MODULE_DESCRIPTION("Actions Semi Owl SoCs SD/MMC Driver");
|
|
MODULE_AUTHOR("Actions Semi");
|
|
MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
|
|
MODULE_LICENSE("GPL");
|