--- /dev/null
+/*
+ * Driver for sunxi SD/MMC host controllers
+ * (C) Copyright 2007-2011 Reuuimlla Technology Co., Ltd.
+ * (C) Copyright 2007-2011 Aaron Maoye <leafy.myeh@reuuimllatech.com>
+ * (C) Copyright 2013-2014 O2S GmbH <www.o2s.ch>
+ * (C) Copyright 2013-2014 David Lanzend�rfer <david.lanzendoerfer@o2s.ch>
+ * (C) Copyright 2013-2014 Hans de Goede <hdegoede@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+
+#include <linux/clk.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/reset.h>
+
+#include <linux/of_address.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/sd.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/core.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/slot-gpio.h>
+
+/* register offset definitions */
+#define SDXC_REG_GCTRL (0x00) /* SMC Global Control Register */
+#define SDXC_REG_CLKCR (0x04) /* SMC Clock Control Register */
+#define SDXC_REG_TMOUT (0x08) /* SMC Time Out Register */
+#define SDXC_REG_WIDTH (0x0C) /* SMC Bus Width Register */
+#define SDXC_REG_BLKSZ (0x10) /* SMC Block Size Register */
+#define SDXC_REG_BCNTR (0x14) /* SMC Byte Count Register */
+#define SDXC_REG_CMDR (0x18) /* SMC Command Register */
+#define SDXC_REG_CARG (0x1C) /* SMC Argument Register */
+#define SDXC_REG_RESP0 (0x20) /* SMC Response Register 0 */
+#define SDXC_REG_RESP1 (0x24) /* SMC Response Register 1 */
+#define SDXC_REG_RESP2 (0x28) /* SMC Response Register 2 */
+#define SDXC_REG_RESP3 (0x2C) /* SMC Response Register 3 */
+#define SDXC_REG_IMASK (0x30) /* SMC Interrupt Mask Register */
+#define SDXC_REG_MISTA (0x34) /* SMC Masked Interrupt Status Register */
+#define SDXC_REG_RINTR (0x38) /* SMC Raw Interrupt Status Register */
+#define SDXC_REG_STAS (0x3C) /* SMC Status Register */
+#define SDXC_REG_FTRGL (0x40) /* SMC FIFO Threshold Watermark Registe */
+#define SDXC_REG_FUNS (0x44) /* SMC Function Select Register */
+#define SDXC_REG_CBCR (0x48) /* SMC CIU Byte Count Register */
+#define SDXC_REG_BBCR (0x4C) /* SMC BIU Byte Count Register */
+#define SDXC_REG_DBGC (0x50) /* SMC Debug Enable Register */
+#define SDXC_REG_HWRST (0x78) /* SMC Card Hardware Reset for Register */
+#define SDXC_REG_DMAC (0x80) /* SMC IDMAC Control Register */
+#define SDXC_REG_DLBA (0x84) /* SMC IDMAC Descriptor List Base Addre */
+#define SDXC_REG_IDST (0x88) /* SMC IDMAC Status Register */
+#define SDXC_REG_IDIE (0x8C) /* SMC IDMAC Interrupt Enable Register */
+#define SDXC_REG_CHDA (0x90)
+#define SDXC_REG_CBDA (0x94)
+
+#define mmc_readl(host, reg) \
+ readl((host)->reg_base + SDXC_##reg)
+#define mmc_writel(host, reg, value) \
+ writel((value), (host)->reg_base + SDXC_##reg)
+
+/* global control register bits */
+#define SDXC_SOFT_RESET BIT(0)
+#define SDXC_FIFO_RESET BIT(1)
+#define SDXC_DMA_RESET BIT(2)
+#define SDXC_INTERRUPT_ENABLE_BIT BIT(4)
+#define SDXC_DMA_ENABLE_BIT BIT(5)
+#define SDXC_DEBOUNCE_ENABLE_BIT BIT(8)
+#define SDXC_POSEDGE_LATCH_DATA BIT(9)
+#define SDXC_DDR_MODE BIT(10)
+#define SDXC_MEMORY_ACCESS_DONE BIT(29)
+#define SDXC_ACCESS_DONE_DIRECT BIT(30)
+#define SDXC_ACCESS_BY_AHB BIT(31)
+#define SDXC_ACCESS_BY_DMA (0 << 31)
+#define SDXC_HARDWARE_RESET \
+ (SDXC_SOFT_RESET | SDXC_FIFO_RESET | SDXC_DMA_RESET)
+
+/* clock control bits */
+#define SDXC_CARD_CLOCK_ON BIT(16)
+#define SDXC_LOW_POWER_ON BIT(17)
+
+/* bus width */
+#define SDXC_WIDTH1 0
+#define SDXC_WIDTH4 1
+#define SDXC_WIDTH8 2
+
+/* smc command bits */
+#define SDXC_RESP_EXPIRE BIT(6)
+#define SDXC_LONG_RESPONSE BIT(7)
+#define SDXC_CHECK_RESPONSE_CRC BIT(8)
+#define SDXC_DATA_EXPIRE BIT(9)
+#define SDXC_WRITE BIT(10)
+#define SDXC_SEQUENCE_MODE BIT(11)
+#define SDXC_SEND_AUTO_STOP BIT(12)
+#define SDXC_WAIT_PRE_OVER BIT(13)
+#define SDXC_STOP_ABORT_CMD BIT(14)
+#define SDXC_SEND_INIT_SEQUENCE BIT(15)
+#define SDXC_UPCLK_ONLY BIT(21)
+#define SDXC_READ_CEATA_DEV BIT(22)
+#define SDXC_CCS_EXPIRE BIT(23)
+#define SDXC_ENABLE_BIT_BOOT BIT(24)
+#define SDXC_ALT_BOOT_OPTIONS BIT(25)
+#define SDXC_BOOT_ACK_EXPIRE BIT(26)
+#define SDXC_BOOT_ABORT BIT(27)
+#define SDXC_VOLTAGE_SWITCH BIT(28)
+#define SDXC_USE_HOLD_REGISTER BIT(29)
+#define SDXC_START BIT(31)
+
+/* interrupt bits */
+#define SDXC_RESP_ERROR BIT(1)
+#define SDXC_COMMAND_DONE BIT(2)
+#define SDXC_DATA_OVER BIT(3)
+#define SDXC_TX_DATA_REQUEST BIT(4)
+#define SDXC_RX_DATA_REQUEST BIT(5)
+#define SDXC_RESP_CRC_ERROR BIT(6)
+#define SDXC_DATA_CRC_ERROR BIT(7)
+#define SDXC_RESP_TIMEOUT BIT(8)
+#define SDXC_DATA_TIMEOUT BIT(9)
+#define SDXC_VOLTAGE_CHANGE_DONE BIT(10)
+#define SDXC_FIFO_RUN_ERROR BIT(11)
+#define SDXC_HARD_WARE_LOCKED BIT(12)
+#define SDXC_START_BIT_ERROR BIT(13)
+#define SDXC_AUTO_COMMAND_DONE BIT(14)
+#define SDXC_END_BIT_ERROR BIT(15)
+#define SDXC_SDIO_INTERRUPT BIT(16)
+#define SDXC_CARD_INSERT BIT(30)
+#define SDXC_CARD_REMOVE BIT(31)
+#define SDXC_INTERRUPT_ERROR_BIT \
+ (SDXC_RESP_ERROR | SDXC_RESP_CRC_ERROR | SDXC_DATA_CRC_ERROR | \
+ SDXC_RESP_TIMEOUT | SDXC_DATA_TIMEOUT | SDXC_FIFO_RUN_ERROR | \
+ SDXC_HARD_WARE_LOCKED | SDXC_START_BIT_ERROR | SDXC_END_BIT_ERROR)
+#define SDXC_INTERRUPT_DONE_BIT \
+ (SDXC_AUTO_COMMAND_DONE | SDXC_DATA_OVER | \
+ SDXC_COMMAND_DONE | SDXC_VOLTAGE_CHANGE_DONE)
+
+/* status */
+#define SDXC_RXWL_FLAG BIT(0)
+#define SDXC_TXWL_FLAG BIT(1)
+#define SDXC_FIFO_EMPTY BIT(2)
+#define SDXC_FIFO_FULL BIT(3)
+#define SDXC_CARD_PRESENT BIT(8)
+#define SDXC_CARD_DATA_BUSY BIT(9)
+#define SDXC_DATA_FSM_BUSY BIT(10)
+#define SDXC_DMA_REQUEST BIT(31)
+#define SDXC_FIFO_SIZE 16
+
+/* Function select */
+#define SDXC_CEATA_ON (0xceaa << 16)
+#define SDXC_SEND_IRQ_RESPONSE BIT(0)
+#define SDXC_SDIO_READ_WAIT BIT(1)
+#define SDXC_ABORT_READ_DATA BIT(2)
+#define SDXC_SEND_CCSD BIT(8)
+#define SDXC_SEND_AUTO_STOPCCSD BIT(9)
+#define SDXC_CEATA_DEV_IRQ_ENABLE BIT(10)
+
+/* IDMA controller bus mod bit field */
+#define SDXC_IDMAC_SOFT_RESET BIT(0)
+#define SDXC_IDMAC_FIX_BURST BIT(1)
+#define SDXC_IDMAC_IDMA_ON BIT(7)
+#define SDXC_IDMAC_REFETCH_DES BIT(31)
+
+/* IDMA status bit field */
+#define SDXC_IDMAC_TRANSMIT_INTERRUPT BIT(0)
+#define SDXC_IDMAC_RECEIVE_INTERRUPT BIT(1)
+#define SDXC_IDMAC_FATAL_BUS_ERROR BIT(2)
+#define SDXC_IDMAC_DESTINATION_INVALID BIT(4)
+#define SDXC_IDMAC_CARD_ERROR_SUM BIT(5)
+#define SDXC_IDMAC_NORMAL_INTERRUPT_SUM BIT(8)
+#define SDXC_IDMAC_ABNORMAL_INTERRUPT_SUM BIT(9)
+#define SDXC_IDMAC_HOST_ABORT_INTERRUPT BIT(10)
+#define SDXC_IDMAC_IDLE (0 << 13)
+#define SDXC_IDMAC_SUSPEND (1 << 13)
+#define SDXC_IDMAC_DESC_READ (2 << 13)
+#define SDXC_IDMAC_DESC_CHECK (3 << 13)
+#define SDXC_IDMAC_READ_REQUEST_WAIT (4 << 13)
+#define SDXC_IDMAC_WRITE_REQUEST_WAIT (5 << 13)
+#define SDXC_IDMAC_READ (6 << 13)
+#define SDXC_IDMAC_WRITE (7 << 13)
+#define SDXC_IDMAC_DESC_CLOSE (8 << 13)
+
+/*
+* If the idma-des-size-bits of property is ie 13, bufsize bits are:
+* Bits 0-12: buf1 size
+* Bits 13-25: buf2 size
+* Bits 26-31: not used
+* Since we only ever set buf1 size, we can simply store it directly.
+*/
+#define SDXC_IDMAC_DES0_DIC BIT(1) /* disable interrupt on completion */
+#define SDXC_IDMAC_DES0_LD BIT(2) /* last descriptor */
+#define SDXC_IDMAC_DES0_FD BIT(3) /* first descriptor */
+#define SDXC_IDMAC_DES0_CH BIT(4) /* chain mode */
+#define SDXC_IDMAC_DES0_ER BIT(5) /* end of ring */
+#define SDXC_IDMAC_DES0_CES BIT(30) /* card error summary */
+#define SDXC_IDMAC_DES0_OWN BIT(31) /* 1-idma owns it, 0-host owns it */
+
+struct sunxi_idma_des {
+ u32 config;
+ u32 buf_size;
+ u32 buf_addr_ptr1;
+ u32 buf_addr_ptr2;
+};
+
+struct sunxi_mmc_host {
+ struct mmc_host *mmc;
+ struct reset_control *reset;
+
+ /* IO mapping base */
+ void __iomem *reg_base;
+
+ /* clock management */
+ struct clk *clk_ahb;
+ struct clk *clk_mmc;
+ struct clk *clk_sample;
+ struct clk *clk_output;
+
+ /* irq */
+ spinlock_t lock;
+ int irq;
+ u32 int_sum;
+ u32 sdio_imask;
+
+ /* dma */
+ u32 idma_des_size_bits;
+ dma_addr_t sg_dma;
+ void *sg_cpu;
+ bool wait_dma;
+
+ struct mmc_request *mrq;
+ struct mmc_request *manual_stop_mrq;
+ int ferror;
+};
+
+static int sunxi_mmc_reset_host(struct sunxi_mmc_host *host)
+{
+ unsigned long expire = jiffies + msecs_to_jiffies(250);
+ u32 rval;
+
+ mmc_writel(host, REG_GCTRL, SDXC_HARDWARE_RESET);
+ do {
+ rval = mmc_readl(host, REG_GCTRL);
+ } while (time_before(jiffies, expire) && (rval & SDXC_HARDWARE_RESET));
+
+ if (rval & SDXC_HARDWARE_RESET) {
+ dev_err(mmc_dev(host->mmc), "fatal err reset timeout\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int sunxi_mmc_init_host(struct mmc_host *mmc)
+{
+ u32 rval;
+ struct sunxi_mmc_host *host = mmc_priv(mmc);
+
+ if (sunxi_mmc_reset_host(host))
+ return -EIO;
+
+ mmc_writel(host, REG_FTRGL, 0x20070008);
+ mmc_writel(host, REG_TMOUT, 0xffffffff);
+ mmc_writel(host, REG_IMASK, host->sdio_imask);
+ mmc_writel(host, REG_RINTR, 0xffffffff);
+ mmc_writel(host, REG_DBGC, 0xdeb);
+ mmc_writel(host, REG_FUNS, SDXC_CEATA_ON);
+ mmc_writel(host, REG_DLBA, host->sg_dma);
+
+ rval = mmc_readl(host, REG_GCTRL);
+ rval |= SDXC_INTERRUPT_ENABLE_BIT;
+ rval &= ~SDXC_ACCESS_DONE_DIRECT;
+ mmc_writel(host, REG_GCTRL, rval);
+
+ return 0;
+}
+
+static void sunxi_mmc_init_idma_des(struct sunxi_mmc_host *host,
+ struct mmc_data *data)
+{
+ struct sunxi_idma_des *pdes = (struct sunxi_idma_des *)host->sg_cpu;
+ dma_addr_t next_desc = host->sg_dma;
+ int i, max_len = (1 << host->idma_des_size_bits);
+
+ for (i = 0; i < data->sg_len; i++) {
+ pdes[i].config = SDXC_IDMAC_DES0_CH | SDXC_IDMAC_DES0_OWN |
+ SDXC_IDMAC_DES0_DIC;
+
+ if (data->sg[i].length == max_len)
+ pdes[i].buf_size = 0; /* 0 == max_len */
+ else
+ pdes[i].buf_size = data->sg[i].length;
+
+ next_desc += sizeof(struct sunxi_idma_des);
+ pdes[i].buf_addr_ptr1 = sg_dma_address(&data->sg[i]);
+ pdes[i].buf_addr_ptr2 = (u32)next_desc;
+ }
+
+ pdes[0].config |= SDXC_IDMAC_DES0_FD;
+ pdes[i - 1].config |= SDXC_IDMAC_DES0_LD | SDXC_IDMAC_DES0_ER;
+ pdes[i - 1].config &= ~SDXC_IDMAC_DES0_DIC;
+ pdes[i - 1].buf_addr_ptr2 = 0;
+
+ /*
+ * Avoid the io-store starting the idmac hitting io-mem before the
+ * descriptors hit the main-mem.
+ */
+ wmb();
+}
+
+static enum dma_data_direction sunxi_mmc_get_dma_dir(struct mmc_data *data)
+{
+ if (data->flags & MMC_DATA_WRITE)
+ return DMA_TO_DEVICE;
+ else
+ return DMA_FROM_DEVICE;
+}
+
+static int sunxi_mmc_map_dma(struct sunxi_mmc_host *host,
+ struct mmc_data *data)
+{
+ u32 i, dma_len;
+ struct scatterlist *sg;
+
+ dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
+ sunxi_mmc_get_dma_dir(data));
+ if (dma_len == 0) {
+ dev_err(mmc_dev(host->mmc), "dma_map_sg failed\n");
+ return -ENOMEM;
+ }
+
+ for_each_sg(data->sg, sg, data->sg_len, i) {
+ if (sg->offset & 3 || sg->length & 3) {
+ dev_err(mmc_dev(host->mmc),
+ "unaligned scatterlist: os %x length %d\n",
+ sg->offset, sg->length);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static void sunxi_mmc_start_dma(struct sunxi_mmc_host *host,
+ struct mmc_data *data)
+{
+ u32 rval;
+
+ sunxi_mmc_init_idma_des(host, data);
+
+ rval = mmc_readl(host, REG_GCTRL);
+ rval |= SDXC_DMA_ENABLE_BIT;
+ mmc_writel(host, REG_GCTRL, rval);
+ rval |= SDXC_DMA_RESET;
+ mmc_writel(host, REG_GCTRL, rval);
+
+ mmc_writel(host, REG_DMAC, SDXC_IDMAC_SOFT_RESET);
+
+ if (!(data->flags & MMC_DATA_WRITE))
+ mmc_writel(host, REG_IDIE, SDXC_IDMAC_RECEIVE_INTERRUPT);
+
+ mmc_writel(host, REG_DMAC,
+ SDXC_IDMAC_FIX_BURST | SDXC_IDMAC_IDMA_ON);
+}
+
+static void sunxi_mmc_send_manual_stop(struct sunxi_mmc_host *host,
+ struct mmc_request *req)
+{
+ u32 arg, cmd_val, ri;
+ unsigned long expire = jiffies + msecs_to_jiffies(1000);
+
+ cmd_val = SDXC_START | SDXC_RESP_EXPIRE |
+ SDXC_STOP_ABORT_CMD | SDXC_CHECK_RESPONSE_CRC;
+
+ if (req->cmd->opcode == SD_IO_RW_EXTENDED) {
+ cmd_val |= SD_IO_RW_DIRECT;
+ arg = (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
+ ((req->cmd->arg >> 28) & 0x7);
+ } else {
+ cmd_val |= MMC_STOP_TRANSMISSION;
+ arg = 0;
+ }
+
+ mmc_writel(host, REG_CARG, arg);
+ mmc_writel(host, REG_CMDR, cmd_val);
+
+ do {
+ ri = mmc_readl(host, REG_RINTR);
+ } while (!(ri & (SDXC_COMMAND_DONE | SDXC_INTERRUPT_ERROR_BIT)) &&
+ time_before(jiffies, expire));
+
+ if (!(ri & SDXC_COMMAND_DONE) || (ri & SDXC_INTERRUPT_ERROR_BIT)) {
+ dev_err(mmc_dev(host->mmc), "send stop command failed\n");
+ if (req->stop)
+ req->stop->resp[0] = -ETIMEDOUT;
+ } else {
+ if (req->stop)
+ req->stop->resp[0] = mmc_readl(host, REG_RESP0);
+ }
+
+ mmc_writel(host, REG_RINTR, 0xffff);
+}
+
+static void sunxi_mmc_dump_errinfo(struct sunxi_mmc_host *host)
+{
+ struct mmc_command *cmd = host->mrq->cmd;
+ struct mmc_data *data = host->mrq->data;
+
+ /* For some cmds timeout is normal with sd/mmc cards */
+ if ((host->int_sum & SDXC_INTERRUPT_ERROR_BIT) ==
+ SDXC_RESP_TIMEOUT && (cmd->opcode == SD_IO_SEND_OP_COND ||
+ cmd->opcode == SD_IO_RW_DIRECT))
+ return;
+
+ dev_err(mmc_dev(host->mmc),
+ "smc %d err, cmd %d,%s%s%s%s%s%s%s%s%s%s !!\n",
+ host->mmc->index, cmd->opcode,
+ data ? (data->flags & MMC_DATA_WRITE ? " WR" : " RD") : "",
+ host->int_sum & SDXC_RESP_ERROR ? " RE" : "",
+ host->int_sum & SDXC_RESP_CRC_ERROR ? " RCE" : "",
+ host->int_sum & SDXC_DATA_CRC_ERROR ? " DCE" : "",
+ host->int_sum & SDXC_RESP_TIMEOUT ? " RTO" : "",
+ host->int_sum & SDXC_DATA_TIMEOUT ? " DTO" : "",
+ host->int_sum & SDXC_FIFO_RUN_ERROR ? " FE" : "",
+ host->int_sum & SDXC_HARD_WARE_LOCKED ? " HL" : "",
+ host->int_sum & SDXC_START_BIT_ERROR ? " SBE" : "",
+ host->int_sum & SDXC_END_BIT_ERROR ? " EBE" : ""
+ );
+}
+
+/* Called in interrupt context! */
+static irqreturn_t sunxi_mmc_finalize_request(struct sunxi_mmc_host *host)
+{
+ struct mmc_request *mrq = host->mrq;
+ struct mmc_data *data = mrq->data;
+ u32 rval;
+
+ mmc_writel(host, REG_IMASK, host->sdio_imask);
+ mmc_writel(host, REG_IDIE, 0);
+
+ if (host->int_sum & SDXC_INTERRUPT_ERROR_BIT) {
+ sunxi_mmc_dump_errinfo(host);
+ mrq->cmd->error = -ETIMEDOUT;
+
+ if (data) {
+ data->error = -ETIMEDOUT;
+ host->manual_stop_mrq = mrq;
+ }
+
+ if (mrq->stop)
+ mrq->stop->error = -ETIMEDOUT;
+ } else {
+ if (mrq->cmd->flags & MMC_RSP_136) {
+ mrq->cmd->resp[0] = mmc_readl(host, REG_RESP3);
+ mrq->cmd->resp[1] = mmc_readl(host, REG_RESP2);
+ mrq->cmd->resp[2] = mmc_readl(host, REG_RESP1);
+ mrq->cmd->resp[3] = mmc_readl(host, REG_RESP0);
+ } else {
+ mrq->cmd->resp[0] = mmc_readl(host, REG_RESP0);
+ }
+
+ if (data)
+ data->bytes_xfered = data->blocks * data->blksz;
+ }
+
+ if (data) {
+ mmc_writel(host, REG_IDST, 0x337);
+ mmc_writel(host, REG_DMAC, 0);
+ rval = mmc_readl(host, REG_GCTRL);
+ rval |= SDXC_DMA_RESET;
+ mmc_writel(host, REG_GCTRL, rval);
+ rval &= ~SDXC_DMA_ENABLE_BIT;
+ mmc_writel(host, REG_GCTRL, rval);
+ rval |= SDXC_FIFO_RESET;
+ mmc_writel(host, REG_GCTRL, rval);
+ dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
+ sunxi_mmc_get_dma_dir(data));
+ }
+
+ mmc_writel(host, REG_RINTR, 0xffff);
+
+ host->mrq = NULL;
+ host->int_sum = 0;
+ host->wait_dma = false;
+
+ return host->manual_stop_mrq ? IRQ_WAKE_THREAD : IRQ_HANDLED;
+}
+
+static irqreturn_t sunxi_mmc_irq(int irq, void *dev_id)
+{
+ struct sunxi_mmc_host *host = dev_id;
+ struct mmc_request *mrq;
+ u32 msk_int, idma_int;
+ bool finalize = false;
+ bool sdio_int = false;
+ irqreturn_t ret = IRQ_HANDLED;
+
+ spin_lock(&host->lock);
+
+ idma_int = mmc_readl(host, REG_IDST);
+ msk_int = mmc_readl(host, REG_MISTA);
+
+ dev_dbg(mmc_dev(host->mmc), "irq: rq %p mi %08x idi %08x\n",
+ host->mrq, msk_int, idma_int);
+
+ mrq = host->mrq;
+ if (mrq) {
+ if (idma_int & SDXC_IDMAC_RECEIVE_INTERRUPT)
+ host->wait_dma = false;
+
+ host->int_sum |= msk_int;
+
+ /* Wait for COMMAND_DONE on RESPONSE_TIMEOUT before finalize */
+ if ((host->int_sum & SDXC_RESP_TIMEOUT) &&
+ !(host->int_sum & SDXC_COMMAND_DONE))
+ mmc_writel(host, REG_IMASK,
+ host->sdio_imask | SDXC_COMMAND_DONE);
+ /* Don't wait for dma on error */
+ else if (host->int_sum & SDXC_INTERRUPT_ERROR_BIT)
+ finalize = true;
+ else if ((host->int_sum & SDXC_INTERRUPT_DONE_BIT) &&
+ !host->wait_dma)
+ finalize = true;
+ }
+
+ if (msk_int & SDXC_SDIO_INTERRUPT)
+ sdio_int = true;
+
+ mmc_writel(host, REG_RINTR, msk_int);
+ mmc_writel(host, REG_IDST, idma_int);
+
+ if (finalize)
+ ret = sunxi_mmc_finalize_request(host);
+
+ spin_unlock(&host->lock);
+
+ if (finalize && ret == IRQ_HANDLED)
+ mmc_request_done(host->mmc, mrq);
+
+ if (sdio_int)
+ mmc_signal_sdio_irq(host->mmc);
+
+ return ret;
+}
+
+static irqreturn_t sunxi_mmc_handle_manual_stop(int irq, void *dev_id)
+{
+ struct sunxi_mmc_host *host = dev_id;
+ struct mmc_request *mrq;
+ unsigned long iflags;
+
+ spin_lock_irqsave(&host->lock, iflags);
+ mrq = host->manual_stop_mrq;
+ spin_unlock_irqrestore(&host->lock, iflags);
+
+ if (!mrq) {
+ dev_err(mmc_dev(host->mmc), "no request for manual stop\n");
+ return IRQ_HANDLED;
+ }
+
+ dev_err(mmc_dev(host->mmc), "data error, sending stop command\n");
+
+ /*
+ * We will never have more than one outstanding request,
+ * and we do not complete the request until after
+ * we've cleared host->manual_stop_mrq so we do not need to
+ * spin lock this function.
+ * Additionally we have wait states within this function
+ * so having it in a lock is a very bad idea.
+ */
+ sunxi_mmc_send_manual_stop(host, mrq);
+
+ spin_lock_irqsave(&host->lock, iflags);
+ host->manual_stop_mrq = NULL;
+ spin_unlock_irqrestore(&host->lock, iflags);
+
+ mmc_request_done(host->mmc, mrq);
+
+ return IRQ_HANDLED;
+}
+
+static int sunxi_mmc_oclk_onoff(struct sunxi_mmc_host *host, u32 oclk_en)
+{
+ unsigned long expire = jiffies + msecs_to_jiffies(250);
+ u32 rval;
+
+ rval = mmc_readl(host, REG_CLKCR);
+ rval &= ~(SDXC_CARD_CLOCK_ON | SDXC_LOW_POWER_ON);
+
+ if (oclk_en)
+ rval |= SDXC_CARD_CLOCK_ON;
+
+ mmc_writel(host, REG_CLKCR, rval);
+
+ rval = SDXC_START | SDXC_UPCLK_ONLY | SDXC_WAIT_PRE_OVER;
+ mmc_writel(host, REG_CMDR, rval);
+
+ do {
+ rval = mmc_readl(host, REG_CMDR);
+ } while (time_before(jiffies, expire) && (rval & SDXC_START));
+
+ /* clear irq status bits set by the command */
+ mmc_writel(host, REG_RINTR,
+ mmc_readl(host, REG_RINTR) & ~SDXC_SDIO_INTERRUPT);
+
+ if (rval & SDXC_START) {
+ dev_err(mmc_dev(host->mmc), "fatal err update clk timeout\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
+ struct mmc_ios *ios)
+{
+ u32 rate, oclk_dly, rval, sclk_dly;
+ int ret;
+
+ rate = clk_round_rate(host->clk_mmc, ios->clock);
+ dev_dbg(mmc_dev(host->mmc), "setting clk to %d, rounded %d\n",
+ ios->clock, rate);
+
+ /* setting clock rate */
+ ret = clk_set_rate(host->clk_mmc, rate);
+ if (ret) {
+ dev_err(mmc_dev(host->mmc), "error setting clk to %d: %d\n",
+ rate, ret);
+ return ret;
+ }
+
+ ret = sunxi_mmc_oclk_onoff(host, 0);
+ if (ret)
+ return ret;
+
+ /* clear internal divider */
+ rval = mmc_readl(host, REG_CLKCR);
+ rval &= ~0xff;
+ mmc_writel(host, REG_CLKCR, rval);
+
+ /* determine delays */
+ if (rate <= 400000) {
+ oclk_dly = 180;
+ sclk_dly = 42;
+ } else if (rate <= 25000000) {
+ oclk_dly = 180;
+ sclk_dly = 75;
+ } else if (rate <= 50000000) {
+ if (ios->timing == MMC_TIMING_UHS_DDR50) {
+ oclk_dly = 60;
+ sclk_dly = 120;
+ } else {
+ oclk_dly = 90;
+ sclk_dly = 150;
+ }
+ } else if (rate <= 100000000) {
+ oclk_dly = 6;
+ sclk_dly = 24;
+ } else if (rate <= 200000000) {
+ oclk_dly = 3;
+ sclk_dly = 12;
+ } else {
+ return -EINVAL;
+ }
+
+ clk_set_phase(host->clk_sample, sclk_dly);
+ clk_set_phase(host->clk_output, oclk_dly);
+
+ return sunxi_mmc_oclk_onoff(host, 1);
+}
+
+static void sunxi_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct sunxi_mmc_host *host = mmc_priv(mmc);
+ u32 rval;
+
+ /* Set the power state */
+ switch (ios->power_mode) {
+ case MMC_POWER_ON:
+ break;
+
+ case MMC_POWER_UP:
+ mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
+
+ host->ferror = sunxi_mmc_init_host(mmc);
+ if (host->ferror)
+ return;
+
+ dev_dbg(mmc_dev(mmc), "power on!\n");
+ break;
+
+ case MMC_POWER_OFF:
+ dev_dbg(mmc_dev(mmc), "power off!\n");
+ sunxi_mmc_reset_host(host);
+ mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
+ break;
+ }
+
+ /* set bus width */
+ switch (ios->bus_width) {
+ case MMC_BUS_WIDTH_1:
+ mmc_writel(host, REG_WIDTH, SDXC_WIDTH1);
+ break;
+ case MMC_BUS_WIDTH_4:
+ mmc_writel(host, REG_WIDTH, SDXC_WIDTH4);
+ break;
+ case MMC_BUS_WIDTH_8:
+ mmc_writel(host, REG_WIDTH, SDXC_WIDTH8);
+ break;
+ }
+
+ /* set ddr mode */
+ rval = mmc_readl(host, REG_GCTRL);
+ if (ios->timing == MMC_TIMING_UHS_DDR50)
+ rval |= SDXC_DDR_MODE;
+ else
+ rval &= ~SDXC_DDR_MODE;
+ mmc_writel(host, REG_GCTRL, rval);
+
+ /* set up clock */
+ if (ios->clock && ios->power_mode) {
+ host->ferror = sunxi_mmc_clk_set_rate(host, ios);
+ /* Android code had a usleep_range(50000, 55000); here */
+ }
+}
+
+static void sunxi_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ struct sunxi_mmc_host *host = mmc_priv(mmc);
+ unsigned long flags;
+ u32 imask;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ imask = mmc_readl(host, REG_IMASK);
+ if (enable) {
+ host->sdio_imask = SDXC_SDIO_INTERRUPT;
+ imask |= SDXC_SDIO_INTERRUPT;
+ } else {
+ host->sdio_imask = 0;
+ imask &= ~SDXC_SDIO_INTERRUPT;
+ }
+ mmc_writel(host, REG_IMASK, imask);
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void sunxi_mmc_hw_reset(struct mmc_host *mmc)
+{
+ struct sunxi_mmc_host *host = mmc_priv(mmc);
+ mmc_writel(host, REG_HWRST, 0);
+ udelay(10);
+ mmc_writel(host, REG_HWRST, 1);
+ udelay(300);
+}
+
+static void sunxi_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct sunxi_mmc_host *host = mmc_priv(mmc);
+ struct mmc_command *cmd = mrq->cmd;
+ struct mmc_data *data = mrq->data;
+ unsigned long iflags;
+ u32 imask = SDXC_INTERRUPT_ERROR_BIT;
+ u32 cmd_val = SDXC_START | (cmd->opcode & 0x3f);
+ bool wait_dma = host->wait_dma;
+ int ret;
+
+ /* Check for set_ios errors (should never happen) */
+ if (host->ferror) {
+ mrq->cmd->error = host->ferror;
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+
+ if (data) {
+ ret = sunxi_mmc_map_dma(host, data);
+ if (ret < 0) {
+ dev_err(mmc_dev(mmc), "map DMA failed\n");
+ cmd->error = ret;
+ data->error = ret;
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+ }
+
+ if (cmd->opcode == MMC_GO_IDLE_STATE) {
+ cmd_val |= SDXC_SEND_INIT_SEQUENCE;
+ imask |= SDXC_COMMAND_DONE;
+ }
+
+ if (cmd->flags & MMC_RSP_PRESENT) {
+ cmd_val |= SDXC_RESP_EXPIRE;
+ if (cmd->flags & MMC_RSP_136)
+ cmd_val |= SDXC_LONG_RESPONSE;
+ if (cmd->flags & MMC_RSP_CRC)
+ cmd_val |= SDXC_CHECK_RESPONSE_CRC;
+
+ if ((cmd->flags & MMC_CMD_MASK) == MMC_CMD_ADTC) {
+ cmd_val |= SDXC_DATA_EXPIRE | SDXC_WAIT_PRE_OVER;
+ if (cmd->data->flags & MMC_DATA_STREAM) {
+ imask |= SDXC_AUTO_COMMAND_DONE;
+ cmd_val |= SDXC_SEQUENCE_MODE |
+ SDXC_SEND_AUTO_STOP;
+ }
+
+ if (cmd->data->stop) {
+ imask |= SDXC_AUTO_COMMAND_DONE;
+ cmd_val |= SDXC_SEND_AUTO_STOP;
+ } else {
+ imask |= SDXC_DATA_OVER;
+ }
+
+ if (cmd->data->flags & MMC_DATA_WRITE)
+ cmd_val |= SDXC_WRITE;
+ else
+ wait_dma = true;
+ } else {
+ imask |= SDXC_COMMAND_DONE;
+ }
+ } else {
+ imask |= SDXC_COMMAND_DONE;
+ }
+
+ dev_dbg(mmc_dev(mmc), "cmd %d(%08x) arg %x ie 0x%08x len %d\n",
+ cmd_val & 0x3f, cmd_val, cmd->arg, imask,
+ mrq->data ? mrq->data->blksz * mrq->data->blocks : 0);
+
+ spin_lock_irqsave(&host->lock, iflags);
+
+ if (host->mrq || host->manual_stop_mrq) {
+ spin_unlock_irqrestore(&host->lock, iflags);
+
+ if (data)
+ dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len,
+ sunxi_mmc_get_dma_dir(data));
+
+ dev_err(mmc_dev(mmc), "request already pending\n");
+ mrq->cmd->error = -EBUSY;
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+
+ if (data) {
+ mmc_writel(host, REG_BLKSZ, data->blksz);
+ mmc_writel(host, REG_BCNTR, data->blksz * data->blocks);
+ sunxi_mmc_start_dma(host, data);
+ }
+
+ host->mrq = mrq;
+ host->wait_dma = wait_dma;
+ mmc_writel(host, REG_IMASK, host->sdio_imask | imask);
+ mmc_writel(host, REG_CARG, cmd->arg);
+ mmc_writel(host, REG_CMDR, cmd_val);
+
+ spin_unlock_irqrestore(&host->lock, iflags);
+}
+
+static const struct of_device_id sunxi_mmc_of_match[] = {
+ { .compatible = "allwinner,sun4i-a10-mmc", },
+ { .compatible = "allwinner,sun5i-a13-mmc", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sunxi_mmc_of_match);
+
+static struct mmc_host_ops sunxi_mmc_ops = {
+ .request = sunxi_mmc_request,
+ .set_ios = sunxi_mmc_set_ios,
+ .get_ro = mmc_gpio_get_ro,
+ .get_cd = mmc_gpio_get_cd,
+ .enable_sdio_irq = sunxi_mmc_enable_sdio_irq,
+ .hw_reset = sunxi_mmc_hw_reset,
+};
+
+static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host,
+ struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ int ret;
+
+ if (of_device_is_compatible(np, "allwinner,sun4i-a10-mmc"))
+ host->idma_des_size_bits = 13;
+ else
+ host->idma_des_size_bits = 16;
+
+ ret = mmc_regulator_get_supply(host->mmc);
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "Could not get vmmc supply\n");
+ return ret;
+ }
+
+ host->reg_base = devm_ioremap_resource(&pdev->dev,
+ platform_get_resource(pdev, IORESOURCE_MEM, 0));
+ if (IS_ERR(host->reg_base))
+ return PTR_ERR(host->reg_base);
+
+ host->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
+ if (IS_ERR(host->clk_ahb)) {
+ dev_err(&pdev->dev, "Could not get ahb clock\n");
+ return PTR_ERR(host->clk_ahb);
+ }
+
+ host->clk_mmc = devm_clk_get(&pdev->dev, "mmc");
+ if (IS_ERR(host->clk_mmc)) {
+ dev_err(&pdev->dev, "Could not get mmc clock\n");
+ return PTR_ERR(host->clk_mmc);
+ }
+
+ host->clk_output = devm_clk_get(&pdev->dev, "output");
+ if (IS_ERR(host->clk_output)) {
+ dev_err(&pdev->dev, "Could not get output clock\n");
+ return PTR_ERR(host->clk_output);
+ }
+
+ host->clk_sample = devm_clk_get(&pdev->dev, "sample");
+ if (IS_ERR(host->clk_sample)) {
+ dev_err(&pdev->dev, "Could not get sample clock\n");
+ return PTR_ERR(host->clk_sample);
+ }
+
+ host->reset = devm_reset_control_get_optional(&pdev->dev, "ahb");
+ if (PTR_ERR(host->reset) == -EPROBE_DEFER)
+ return PTR_ERR(host->reset);
+
+ ret = clk_prepare_enable(host->clk_ahb);
+ if (ret) {
+ dev_err(&pdev->dev, "Enable ahb clk err %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(host->clk_mmc);
+ if (ret) {
+ dev_err(&pdev->dev, "Enable mmc clk err %d\n", ret);
+ goto error_disable_clk_ahb;
+ }
+
+ ret = clk_prepare_enable(host->clk_output);
+ if (ret) {
+ dev_err(&pdev->dev, "Enable output clk err %d\n", ret);
+ goto error_disable_clk_mmc;
+ }
+
+ ret = clk_prepare_enable(host->clk_sample);
+ if (ret) {
+ dev_err(&pdev->dev, "Enable sample clk err %d\n", ret);
+ goto error_disable_clk_output;
+ }
+
+ if (!IS_ERR(host->reset)) {
+ ret = reset_control_deassert(host->reset);
+ if (ret) {
+ dev_err(&pdev->dev, "reset err %d\n", ret);
+ goto error_disable_clk_sample;
+ }
+ }
+
+ /*
+ * Sometimes the controller asserts the irq on boot for some reason,
+ * make sure the controller is in a sane state before enabling irqs.
+ */
+ ret = sunxi_mmc_reset_host(host);
+ if (ret)
+ goto error_assert_reset;
+
+ host->irq = platform_get_irq(pdev, 0);
+ return devm_request_threaded_irq(&pdev->dev, host->irq, sunxi_mmc_irq,
+ sunxi_mmc_handle_manual_stop, 0, "sunxi-mmc", host);
+
+error_assert_reset:
+ if (!IS_ERR(host->reset))
+ reset_control_assert(host->reset);
+error_disable_clk_sample:
+ clk_disable_unprepare(host->clk_sample);
+error_disable_clk_output:
+ clk_disable_unprepare(host->clk_output);
+error_disable_clk_mmc:
+ clk_disable_unprepare(host->clk_mmc);
+error_disable_clk_ahb:
+ clk_disable_unprepare(host->clk_ahb);
+ return ret;
+}
+
+static int sunxi_mmc_probe(struct platform_device *pdev)
+{
+ struct sunxi_mmc_host *host;
+ struct mmc_host *mmc;
+ int ret;
+
+ mmc = mmc_alloc_host(sizeof(struct sunxi_mmc_host), &pdev->dev);
+ if (!mmc) {
+ dev_err(&pdev->dev, "mmc alloc host failed\n");
+ return -ENOMEM;
+ }
+
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+ spin_lock_init(&host->lock);
+
+ ret = sunxi_mmc_resource_request(host, pdev);
+ if (ret)
+ goto error_free_host;
+
+ host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE,
+ &host->sg_dma, GFP_KERNEL);
+ if (!host->sg_cpu) {
+ dev_err(&pdev->dev, "Failed to allocate DMA descriptor mem\n");
+ ret = -ENOMEM;
+ goto error_free_host;
+ }
+
+ mmc->ops = &sunxi_mmc_ops;
+ mmc->max_blk_count = 8192;
+ mmc->max_blk_size = 4096;
+ mmc->max_segs = PAGE_SIZE / sizeof(struct sunxi_idma_des);
+ mmc->max_seg_size = (1 << host->idma_des_size_bits);
+ mmc->max_req_size = mmc->max_seg_size * mmc->max_segs;
+ /* 400kHz ~ 50MHz */
+ mmc->f_min = 400000;
+ mmc->f_max = 50000000;
+ mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
+ MMC_CAP_ERASE | MMC_CAP_SDIO_IRQ;
+
+ ret = mmc_of_parse(mmc);
+ if (ret)
+ goto error_free_dma;
+
+ ret = mmc_add_host(mmc);
+ if (ret)
+ goto error_free_dma;
+
+ dev_info(&pdev->dev, "base:0x%p irq:%u\n", host->reg_base, host->irq);
+ platform_set_drvdata(pdev, mmc);
+ return 0;
+
+error_free_dma:
+ dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
+error_free_host:
+ mmc_free_host(mmc);
+ return ret;
+}
+
+static int sunxi_mmc_remove(struct platform_device *pdev)
+{
+ struct mmc_host *mmc = platform_get_drvdata(pdev);
+ struct sunxi_mmc_host *host = mmc_priv(mmc);
+
+ mmc_remove_host(mmc);
+ disable_irq(host->irq);
+ sunxi_mmc_reset_host(host);
+
+ if (!IS_ERR(host->reset))
+ reset_control_assert(host->reset);
+
+ clk_disable_unprepare(host->clk_mmc);
+ clk_disable_unprepare(host->clk_ahb);
+
+ dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
+ mmc_free_host(mmc);
+
+ return 0;
+}
+
+static struct platform_driver sunxi_mmc_driver = {
+ .driver = {
+ .name = "sunxi-mmc",
+ .of_match_table = of_match_ptr(sunxi_mmc_of_match),
+ },
+ .probe = sunxi_mmc_probe,
+ .remove = sunxi_mmc_remove,
+};
+module_platform_driver(sunxi_mmc_driver);
+
+MODULE_DESCRIPTION("Allwinner's SD/MMC Card Controller Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("David Lanzend�rfer <david.lanzendoerfer@o2s.ch>");
+MODULE_ALIAS("platform:sunxi-mmc");
Code Review / kvmfornfv.git / blobdiff