+++ /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/clk-private.h>
-#include <linux/clk/sunxi.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;
-
- /* 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_CMDR, 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;
- struct sunxi_idma_des *pdes_pa = (struct sunxi_idma_des *)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;
-
- pdes[i].buf_addr_ptr1 = sg_dma_address(&data->sg[i]);
- pdes[i].buf_addr_ptr2 = (u32)&pdes_pa[i + 1];
- }
-
- pdes[0].config |= SDXC_IDMAC_DES0_FD;
- pdes[i - 1].config = SDXC_IDMAC_DES0_OWN | SDXC_IDMAC_DES0_LD;
-
- /*
- * 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");
- 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, src_clk;
- 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 = 0;
- sclk_dly = 7;
- } else if (rate <= 25000000) {
- oclk_dly = 0;
- sclk_dly = 5;
- } else if (rate <= 50000000) {
- if (ios->timing == MMC_TIMING_UHS_DDR50) {
- oclk_dly = 2;
- sclk_dly = 4;
- } else {
- oclk_dly = 3;
- sclk_dly = 5;
- }
- } else {
- /* rate > 50000000 */
- oclk_dly = 2;
- sclk_dly = 4;
- }
-
- src_clk = clk_get_rate(clk_get_parent(host->clk_mmc));
- if (src_clk >= 300000000 && src_clk <= 400000000) {
- if (oclk_dly)
- oclk_dly--;
- if (sclk_dly)
- sclk_dly--;
- }
-
- clk_sunxi_mmc_phase_control(host->clk_mmc, sclk_dly, 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);
- 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
- host->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;
- 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->reset = devm_reset_control_get(&pdev->dev, "ahb");
-
- 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;
- }
-
- 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_mmc;
- }
- }
-
- /*
- * 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_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;
-
- 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",
- .owner = THIS_MODULE,
- .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");
projects / karo-tx-linux.git / blobdiff