| /* |
| * Copyright (C) 2013-2014 Renesas Electronics Europe Ltd. |
| * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of version 2 of the GNU General Public License as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/delay.h> |
| #include <linux/device.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/dmaengine.h> |
| #include <linux/highmem.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/log2.h> |
| #include <linux/mmc/host.h> |
| #include <linux/mmc/mmc.h> |
| #include <linux/mmc/sd.h> |
| #include <linux/mmc/sdio.h> |
| #include <linux/module.h> |
| #include <linux/pagemap.h> |
| #include <linux/platform_device.h> |
| #include <linux/scatterlist.h> |
| #include <linux/string.h> |
| #include <linux/time.h> |
| #include <linux/virtio.h> |
| #include <linux/workqueue.h> |
| |
| #define USDHI6_SD_CMD 0x0000 |
| #define USDHI6_SD_PORT_SEL 0x0004 |
| #define USDHI6_SD_ARG 0x0008 |
| #define USDHI6_SD_STOP 0x0010 |
| #define USDHI6_SD_SECCNT 0x0014 |
| #define USDHI6_SD_RSP10 0x0018 |
| #define USDHI6_SD_RSP32 0x0020 |
| #define USDHI6_SD_RSP54 0x0028 |
| #define USDHI6_SD_RSP76 0x0030 |
| #define USDHI6_SD_INFO1 0x0038 |
| #define USDHI6_SD_INFO2 0x003c |
| #define USDHI6_SD_INFO1_MASK 0x0040 |
| #define USDHI6_SD_INFO2_MASK 0x0044 |
| #define USDHI6_SD_CLK_CTRL 0x0048 |
| #define USDHI6_SD_SIZE 0x004c |
| #define USDHI6_SD_OPTION 0x0050 |
| #define USDHI6_SD_ERR_STS1 0x0058 |
| #define USDHI6_SD_ERR_STS2 0x005c |
| #define USDHI6_SD_BUF0 0x0060 |
| #define USDHI6_SDIO_MODE 0x0068 |
| #define USDHI6_SDIO_INFO1 0x006c |
| #define USDHI6_SDIO_INFO1_MASK 0x0070 |
| #define USDHI6_CC_EXT_MODE 0x01b0 |
| #define USDHI6_SOFT_RST 0x01c0 |
| #define USDHI6_VERSION 0x01c4 |
| #define USDHI6_HOST_MODE 0x01c8 |
| #define USDHI6_SDIF_MODE 0x01cc |
| |
| #define USDHI6_SD_CMD_APP 0x0040 |
| #define USDHI6_SD_CMD_MODE_RSP_AUTO 0x0000 |
| #define USDHI6_SD_CMD_MODE_RSP_NONE 0x0300 |
| #define USDHI6_SD_CMD_MODE_RSP_R1 0x0400 /* Also R5, R6, R7 */ |
| #define USDHI6_SD_CMD_MODE_RSP_R1B 0x0500 /* R1b */ |
| #define USDHI6_SD_CMD_MODE_RSP_R2 0x0600 |
| #define USDHI6_SD_CMD_MODE_RSP_R3 0x0700 /* Also R4 */ |
| #define USDHI6_SD_CMD_DATA 0x0800 |
| #define USDHI6_SD_CMD_READ 0x1000 |
| #define USDHI6_SD_CMD_MULTI 0x2000 |
| #define USDHI6_SD_CMD_CMD12_AUTO_OFF 0x4000 |
| |
| #define USDHI6_CC_EXT_MODE_SDRW BIT(1) |
| |
| #define USDHI6_SD_INFO1_RSP_END BIT(0) |
| #define USDHI6_SD_INFO1_ACCESS_END BIT(2) |
| #define USDHI6_SD_INFO1_CARD_OUT BIT(3) |
| #define USDHI6_SD_INFO1_CARD_IN BIT(4) |
| #define USDHI6_SD_INFO1_CD BIT(5) |
| #define USDHI6_SD_INFO1_WP BIT(7) |
| #define USDHI6_SD_INFO1_D3_CARD_OUT BIT(8) |
| #define USDHI6_SD_INFO1_D3_CARD_IN BIT(9) |
| |
| #define USDHI6_SD_INFO2_CMD_ERR BIT(0) |
| #define USDHI6_SD_INFO2_CRC_ERR BIT(1) |
| #define USDHI6_SD_INFO2_END_ERR BIT(2) |
| #define USDHI6_SD_INFO2_TOUT BIT(3) |
| #define USDHI6_SD_INFO2_IWA_ERR BIT(4) |
| #define USDHI6_SD_INFO2_IRA_ERR BIT(5) |
| #define USDHI6_SD_INFO2_RSP_TOUT BIT(6) |
| #define USDHI6_SD_INFO2_SDDAT0 BIT(7) |
| #define USDHI6_SD_INFO2_BRE BIT(8) |
| #define USDHI6_SD_INFO2_BWE BIT(9) |
| #define USDHI6_SD_INFO2_SCLKDIVEN BIT(13) |
| #define USDHI6_SD_INFO2_CBSY BIT(14) |
| #define USDHI6_SD_INFO2_ILA BIT(15) |
| |
| #define USDHI6_SD_INFO1_CARD_INSERT (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_D3_CARD_IN) |
| #define USDHI6_SD_INFO1_CARD_EJECT (USDHI6_SD_INFO1_CARD_OUT | USDHI6_SD_INFO1_D3_CARD_OUT) |
| #define USDHI6_SD_INFO1_CARD (USDHI6_SD_INFO1_CARD_INSERT | USDHI6_SD_INFO1_CARD_EJECT) |
| #define USDHI6_SD_INFO1_CARD_CD (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_CARD_OUT) |
| |
| #define USDHI6_SD_INFO2_ERR (USDHI6_SD_INFO2_CMD_ERR | \ |
| USDHI6_SD_INFO2_CRC_ERR | USDHI6_SD_INFO2_END_ERR | \ |
| USDHI6_SD_INFO2_TOUT | USDHI6_SD_INFO2_IWA_ERR | \ |
| USDHI6_SD_INFO2_IRA_ERR | USDHI6_SD_INFO2_RSP_TOUT | \ |
| USDHI6_SD_INFO2_ILA) |
| |
| #define USDHI6_SD_INFO1_IRQ (USDHI6_SD_INFO1_RSP_END | USDHI6_SD_INFO1_ACCESS_END | \ |
| USDHI6_SD_INFO1_CARD) |
| |
| #define USDHI6_SD_INFO2_IRQ (USDHI6_SD_INFO2_ERR | USDHI6_SD_INFO2_BRE | \ |
| USDHI6_SD_INFO2_BWE | 0x0800 | USDHI6_SD_INFO2_ILA) |
| |
| #define USDHI6_SD_CLK_CTRL_SCLKEN BIT(8) |
| |
| #define USDHI6_SD_STOP_STP BIT(0) |
| #define USDHI6_SD_STOP_SEC BIT(8) |
| |
| #define USDHI6_SDIO_INFO1_IOIRQ BIT(0) |
| #define USDHI6_SDIO_INFO1_EXPUB52 BIT(14) |
| #define USDHI6_SDIO_INFO1_EXWT BIT(15) |
| |
| #define USDHI6_SD_ERR_STS1_CRC_NO_ERROR BIT(13) |
| |
| #define USDHI6_SOFT_RST_RESERVED (BIT(1) | BIT(2)) |
| #define USDHI6_SOFT_RST_RESET BIT(0) |
| |
| #define USDHI6_SD_OPTION_TIMEOUT_SHIFT 4 |
| #define USDHI6_SD_OPTION_TIMEOUT_MASK (0xf << USDHI6_SD_OPTION_TIMEOUT_SHIFT) |
| #define USDHI6_SD_OPTION_WIDTH_1 BIT(15) |
| |
| #define USDHI6_SD_PORT_SEL_PORTS_SHIFT 8 |
| |
| #define USDHI6_SD_CLK_CTRL_DIV_MASK 0xff |
| |
| #define USDHI6_SDIO_INFO1_IRQ (USDHI6_SDIO_INFO1_IOIRQ | 3 | \ |
| USDHI6_SDIO_INFO1_EXPUB52 | USDHI6_SDIO_INFO1_EXWT) |
| |
| #define USDHI6_MIN_DMA 64 |
| |
| enum usdhi6_wait_for { |
| USDHI6_WAIT_FOR_REQUEST, |
| USDHI6_WAIT_FOR_CMD, |
| USDHI6_WAIT_FOR_MREAD, |
| USDHI6_WAIT_FOR_MWRITE, |
| USDHI6_WAIT_FOR_READ, |
| USDHI6_WAIT_FOR_WRITE, |
| USDHI6_WAIT_FOR_DATA_END, |
| USDHI6_WAIT_FOR_STOP, |
| USDHI6_WAIT_FOR_DMA, |
| }; |
| |
| struct usdhi6_page { |
| struct page *page; |
| void *mapped; /* mapped page */ |
| }; |
| |
| struct usdhi6_host { |
| struct mmc_host *mmc; |
| struct mmc_request *mrq; |
| void __iomem *base; |
| struct clk *clk; |
| |
| /* SG memory handling */ |
| |
| /* Common for multiple and single block requests */ |
| struct usdhi6_page pg; /* current page from an SG */ |
| void *blk_page; /* either a mapped page, or the bounce buffer */ |
| size_t offset; /* offset within a page, including sg->offset */ |
| |
| /* Blocks, crossing a page boundary */ |
| size_t head_len; |
| struct usdhi6_page head_pg; |
| |
| /* A bounce buffer for unaligned blocks or blocks, crossing a page boundary */ |
| struct scatterlist bounce_sg; |
| u8 bounce_buf[512]; |
| |
| /* Multiple block requests only */ |
| struct scatterlist *sg; /* current SG segment */ |
| int page_idx; /* page index within an SG segment */ |
| |
| enum usdhi6_wait_for wait; |
| u32 status_mask; |
| u32 status2_mask; |
| u32 sdio_mask; |
| u32 io_error; |
| u32 irq_status; |
| unsigned long imclk; |
| unsigned long rate; |
| bool app_cmd; |
| |
| /* Timeout handling */ |
| struct delayed_work timeout_work; |
| unsigned long timeout; |
| |
| /* DMA support */ |
| struct dma_chan *chan_rx; |
| struct dma_chan *chan_tx; |
| bool dma_active; |
| }; |
| |
| /* I/O primitives */ |
| |
| static void usdhi6_write(struct usdhi6_host *host, u32 reg, u32 data) |
| { |
| iowrite32(data, host->base + reg); |
| dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, |
| host->base, reg, data); |
| } |
| |
| static void usdhi6_write16(struct usdhi6_host *host, u32 reg, u16 data) |
| { |
| iowrite16(data, host->base + reg); |
| dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, |
| host->base, reg, data); |
| } |
| |
| static u32 usdhi6_read(struct usdhi6_host *host, u32 reg) |
| { |
| u32 data = ioread32(host->base + reg); |
| dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, |
| host->base, reg, data); |
| return data; |
| } |
| |
| static u16 usdhi6_read16(struct usdhi6_host *host, u32 reg) |
| { |
| u16 data = ioread16(host->base + reg); |
| dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, |
| host->base, reg, data); |
| return data; |
| } |
| |
| static void usdhi6_irq_enable(struct usdhi6_host *host, u32 info1, u32 info2) |
| { |
| host->status_mask = USDHI6_SD_INFO1_IRQ & ~info1; |
| host->status2_mask = USDHI6_SD_INFO2_IRQ & ~info2; |
| usdhi6_write(host, USDHI6_SD_INFO1_MASK, host->status_mask); |
| usdhi6_write(host, USDHI6_SD_INFO2_MASK, host->status2_mask); |
| } |
| |
| static void usdhi6_wait_for_resp(struct usdhi6_host *host) |
| { |
| usdhi6_irq_enable(host, USDHI6_SD_INFO1_RSP_END | |
| USDHI6_SD_INFO1_ACCESS_END | USDHI6_SD_INFO1_CARD_CD, |
| USDHI6_SD_INFO2_ERR); |
| } |
| |
| static void usdhi6_wait_for_brwe(struct usdhi6_host *host, bool read) |
| { |
| usdhi6_irq_enable(host, USDHI6_SD_INFO1_ACCESS_END | |
| USDHI6_SD_INFO1_CARD_CD, USDHI6_SD_INFO2_ERR | |
| (read ? USDHI6_SD_INFO2_BRE : USDHI6_SD_INFO2_BWE)); |
| } |
| |
| static void usdhi6_only_cd(struct usdhi6_host *host) |
| { |
| /* Mask all except card hotplug */ |
| usdhi6_irq_enable(host, USDHI6_SD_INFO1_CARD_CD, 0); |
| } |
| |
| static void usdhi6_mask_all(struct usdhi6_host *host) |
| { |
| usdhi6_irq_enable(host, 0, 0); |
| } |
| |
| static int usdhi6_error_code(struct usdhi6_host *host) |
| { |
| u32 err; |
| |
| usdhi6_write(host, USDHI6_SD_STOP, USDHI6_SD_STOP_STP); |
| |
| if (host->io_error & |
| (USDHI6_SD_INFO2_RSP_TOUT | USDHI6_SD_INFO2_TOUT)) { |
| u32 rsp54 = usdhi6_read(host, USDHI6_SD_RSP54); |
| int opc = host->mrq ? host->mrq->cmd->opcode : -1; |
| |
| err = usdhi6_read(host, USDHI6_SD_ERR_STS2); |
| /* Response timeout is often normal, don't spam the log */ |
| if (host->wait == USDHI6_WAIT_FOR_CMD) |
| dev_dbg(mmc_dev(host->mmc), |
| "T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n", |
| err, rsp54, host->wait, opc); |
| else |
| dev_warn(mmc_dev(host->mmc), |
| "T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n", |
| err, rsp54, host->wait, opc); |
| return -ETIMEDOUT; |
| } |
| |
| err = usdhi6_read(host, USDHI6_SD_ERR_STS1); |
| if (err != USDHI6_SD_ERR_STS1_CRC_NO_ERROR) |
| dev_warn(mmc_dev(host->mmc), "Err sts 0x%x, state %u, CMD%d\n", |
| err, host->wait, host->mrq ? host->mrq->cmd->opcode : -1); |
| if (host->io_error & USDHI6_SD_INFO2_ILA) |
| return -EILSEQ; |
| |
| return -EIO; |
| } |
| |
| /* Scatter-Gather management */ |
| |
| /* |
| * In PIO mode we have to map each page separately, using kmap(). That way |
| * adjacent pages are mapped to non-adjacent virtual addresses. That's why we |
| * have to use a bounce buffer for blocks, crossing page boundaries. Such blocks |
| * have been observed with an SDIO WiFi card (b43 driver). |
| */ |
| static void usdhi6_blk_bounce(struct usdhi6_host *host, |
| struct scatterlist *sg) |
| { |
| struct mmc_data *data = host->mrq->data; |
| size_t blk_head = host->head_len; |
| |
| dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u of %u SG: %ux%u @ 0x%x\n", |
| __func__, host->mrq->cmd->opcode, data->sg_len, |
| data->blksz, data->blocks, sg->offset); |
| |
| host->head_pg.page = host->pg.page; |
| host->head_pg.mapped = host->pg.mapped; |
| host->pg.page = nth_page(host->pg.page, 1); |
| host->pg.mapped = kmap(host->pg.page); |
| |
| host->blk_page = host->bounce_buf; |
| host->offset = 0; |
| |
| if (data->flags & MMC_DATA_READ) |
| return; |
| |
| memcpy(host->bounce_buf, host->head_pg.mapped + PAGE_SIZE - blk_head, |
| blk_head); |
| memcpy(host->bounce_buf + blk_head, host->pg.mapped, |
| data->blksz - blk_head); |
| } |
| |
| /* Only called for multiple block IO */ |
| static void usdhi6_sg_prep(struct usdhi6_host *host) |
| { |
| struct mmc_request *mrq = host->mrq; |
| struct mmc_data *data = mrq->data; |
| |
| usdhi6_write(host, USDHI6_SD_SECCNT, data->blocks); |
| |
| host->sg = data->sg; |
| /* TODO: if we always map, this is redundant */ |
| host->offset = host->sg->offset; |
| } |
| |
| /* Map the first page in an SG segment: common for multiple and single block IO */ |
| static void *usdhi6_sg_map(struct usdhi6_host *host) |
| { |
| struct mmc_data *data = host->mrq->data; |
| struct scatterlist *sg = data->sg_len > 1 ? host->sg : data->sg; |
| size_t head = PAGE_SIZE - sg->offset; |
| size_t blk_head = head % data->blksz; |
| |
| WARN(host->pg.page, "%p not properly unmapped!\n", host->pg.page); |
| if (WARN(sg_dma_len(sg) % data->blksz, |
| "SG size %u isn't a multiple of block size %u\n", |
| sg_dma_len(sg), data->blksz)) |
| return NULL; |
| |
| host->pg.page = sg_page(sg); |
| host->pg.mapped = kmap(host->pg.page); |
| host->offset = sg->offset; |
| |
| /* |
| * Block size must be a power of 2 for multi-block transfers, |
| * therefore blk_head is equal for all pages in this SG |
| */ |
| host->head_len = blk_head; |
| |
| if (head < data->blksz) |
| /* |
| * The first block in the SG crosses a page boundary. |
| * Max blksz = 512, so blocks can only span 2 pages |
| */ |
| usdhi6_blk_bounce(host, sg); |
| else |
| host->blk_page = host->pg.mapped; |
| |
| dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p + %u for CMD%u @ 0x%p\n", |
| host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped, |
| sg->offset, host->mrq->cmd->opcode, host->mrq); |
| |
| return host->blk_page + host->offset; |
| } |
| |
| /* Unmap the current page: common for multiple and single block IO */ |
| static void usdhi6_sg_unmap(struct usdhi6_host *host, bool force) |
| { |
| struct mmc_data *data = host->mrq->data; |
| struct page *page = host->head_pg.page; |
| |
| if (page) { |
| /* Previous block was cross-page boundary */ |
| struct scatterlist *sg = data->sg_len > 1 ? |
| host->sg : data->sg; |
| size_t blk_head = host->head_len; |
| |
| if (!data->error && data->flags & MMC_DATA_READ) { |
| memcpy(host->head_pg.mapped + PAGE_SIZE - blk_head, |
| host->bounce_buf, blk_head); |
| memcpy(host->pg.mapped, host->bounce_buf + blk_head, |
| data->blksz - blk_head); |
| } |
| |
| flush_dcache_page(page); |
| kunmap(page); |
| |
| host->head_pg.page = NULL; |
| |
| if (!force && sg_dma_len(sg) + sg->offset > |
| (host->page_idx << PAGE_SHIFT) + data->blksz - blk_head) |
| /* More blocks in this SG, don't unmap the next page */ |
| return; |
| } |
| |
| page = host->pg.page; |
| if (!page) |
| return; |
| |
| flush_dcache_page(page); |
| kunmap(page); |
| |
| host->pg.page = NULL; |
| } |
| |
| /* Called from MMC_WRITE_MULTIPLE_BLOCK or MMC_READ_MULTIPLE_BLOCK */ |
| static void usdhi6_sg_advance(struct usdhi6_host *host) |
| { |
| struct mmc_data *data = host->mrq->data; |
| size_t done, total; |
| |
| /* New offset: set at the end of the previous block */ |
| if (host->head_pg.page) { |
| /* Finished a cross-page block, jump to the new page */ |
| host->page_idx++; |
| host->offset = data->blksz - host->head_len; |
| host->blk_page = host->pg.mapped; |
| usdhi6_sg_unmap(host, false); |
| } else { |
| host->offset += data->blksz; |
| /* The completed block didn't cross a page boundary */ |
| if (host->offset == PAGE_SIZE) { |
| /* If required, we'll map the page below */ |
| host->offset = 0; |
| host->page_idx++; |
| } |
| } |
| |
| /* |
| * Now host->blk_page + host->offset point at the end of our last block |
| * and host->page_idx is the index of the page, in which our new block |
| * is located, if any |
| */ |
| |
| done = (host->page_idx << PAGE_SHIFT) + host->offset; |
| total = host->sg->offset + sg_dma_len(host->sg); |
| |
| dev_dbg(mmc_dev(host->mmc), "%s(): %zu of %zu @ %zu\n", __func__, |
| done, total, host->offset); |
| |
| if (done < total && host->offset) { |
| /* More blocks in this page */ |
| if (host->offset + data->blksz > PAGE_SIZE) |
| /* We approached at a block, that spans 2 pages */ |
| usdhi6_blk_bounce(host, host->sg); |
| |
| return; |
| } |
| |
| /* Finished current page or an SG segment */ |
| usdhi6_sg_unmap(host, false); |
| |
| if (done == total) { |
| /* |
| * End of an SG segment or the complete SG: jump to the next |
| * segment, we'll map it later in usdhi6_blk_read() or |
| * usdhi6_blk_write() |
| */ |
| struct scatterlist *next = sg_next(host->sg); |
| |
| host->page_idx = 0; |
| |
| if (!next) |
| host->wait = USDHI6_WAIT_FOR_DATA_END; |
| host->sg = next; |
| |
| if (WARN(next && sg_dma_len(next) % data->blksz, |
| "SG size %u isn't a multiple of block size %u\n", |
| sg_dma_len(next), data->blksz)) |
| data->error = -EINVAL; |
| |
| return; |
| } |
| |
| /* We cannot get here after crossing a page border */ |
| |
| /* Next page in the same SG */ |
| host->pg.page = nth_page(sg_page(host->sg), host->page_idx); |
| host->pg.mapped = kmap(host->pg.page); |
| host->blk_page = host->pg.mapped; |
| |
| dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p for CMD%u @ 0x%p\n", |
| host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped, |
| host->mrq->cmd->opcode, host->mrq); |
| } |
| |
| /* DMA handling */ |
| |
| static void usdhi6_dma_release(struct usdhi6_host *host) |
| { |
| host->dma_active = false; |
| if (host->chan_tx) { |
| struct dma_chan *chan = host->chan_tx; |
| host->chan_tx = NULL; |
| dma_release_channel(chan); |
| } |
| if (host->chan_rx) { |
| struct dma_chan *chan = host->chan_rx; |
| host->chan_rx = NULL; |
| dma_release_channel(chan); |
| } |
| } |
| |
| static void usdhi6_dma_stop_unmap(struct usdhi6_host *host) |
| { |
| struct mmc_data *data = host->mrq->data; |
| |
| if (!host->dma_active) |
| return; |
| |
| usdhi6_write(host, USDHI6_CC_EXT_MODE, 0); |
| host->dma_active = false; |
| |
| if (data->flags & MMC_DATA_READ) |
| dma_unmap_sg(host->chan_rx->device->dev, data->sg, |
| data->sg_len, DMA_FROM_DEVICE); |
| else |
| dma_unmap_sg(host->chan_tx->device->dev, data->sg, |
| data->sg_len, DMA_TO_DEVICE); |
| } |
| |
| static void usdhi6_dma_complete(void *arg) |
| { |
| struct usdhi6_host *host = arg; |
| struct mmc_request *mrq = host->mrq; |
| |
| if (WARN(!mrq || !mrq->data, "%s: NULL data in DMA completion for %p!\n", |
| dev_name(mmc_dev(host->mmc)), mrq)) |
| return; |
| |
| dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u DMA completed\n", __func__, |
| mrq->cmd->opcode); |
| |
| usdhi6_dma_stop_unmap(host); |
| usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ); |
| } |
| |
| static int usdhi6_dma_setup(struct usdhi6_host *host, struct dma_chan *chan, |
| enum dma_transfer_direction dir) |
| { |
| struct mmc_data *data = host->mrq->data; |
| struct scatterlist *sg = data->sg; |
| struct dma_async_tx_descriptor *desc = NULL; |
| dma_cookie_t cookie = -EINVAL; |
| enum dma_data_direction data_dir; |
| int ret; |
| |
| switch (dir) { |
| case DMA_MEM_TO_DEV: |
| data_dir = DMA_TO_DEVICE; |
| break; |
| case DMA_DEV_TO_MEM: |
| data_dir = DMA_FROM_DEVICE; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| ret = dma_map_sg(chan->device->dev, sg, data->sg_len, data_dir); |
| if (ret > 0) { |
| host->dma_active = true; |
| desc = dmaengine_prep_slave_sg(chan, sg, ret, dir, |
| DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
| } |
| |
| if (desc) { |
| desc->callback = usdhi6_dma_complete; |
| desc->callback_param = host; |
| cookie = dmaengine_submit(desc); |
| } |
| |
| dev_dbg(mmc_dev(host->mmc), "%s(): mapped %d -> %d, cookie %d @ %p\n", |
| __func__, data->sg_len, ret, cookie, desc); |
| |
| if (cookie < 0) { |
| /* DMA failed, fall back to PIO */ |
| if (ret >= 0) |
| ret = cookie; |
| usdhi6_dma_release(host); |
| dev_warn(mmc_dev(host->mmc), |
| "DMA failed: %d, falling back to PIO\n", ret); |
| } |
| |
| return cookie; |
| } |
| |
| static int usdhi6_dma_start(struct usdhi6_host *host) |
| { |
| if (!host->chan_rx || !host->chan_tx) |
| return -ENODEV; |
| |
| if (host->mrq->data->flags & MMC_DATA_READ) |
| return usdhi6_dma_setup(host, host->chan_rx, DMA_DEV_TO_MEM); |
| |
| return usdhi6_dma_setup(host, host->chan_tx, DMA_MEM_TO_DEV); |
| } |
| |
| static void usdhi6_dma_kill(struct usdhi6_host *host) |
| { |
| struct mmc_data *data = host->mrq->data; |
| |
| dev_dbg(mmc_dev(host->mmc), "%s(): SG of %u: %ux%u\n", |
| __func__, data->sg_len, data->blocks, data->blksz); |
| /* Abort DMA */ |
| if (data->flags & MMC_DATA_READ) |
| dmaengine_terminate_all(host->chan_rx); |
| else |
| dmaengine_terminate_all(host->chan_tx); |
| } |
| |
| static void usdhi6_dma_check_error(struct usdhi6_host *host) |
| { |
| struct mmc_data *data = host->mrq->data; |
| |
| dev_dbg(mmc_dev(host->mmc), "%s(): IO error %d, status 0x%x\n", |
| __func__, host->io_error, usdhi6_read(host, USDHI6_SD_INFO1)); |
| |
| if (host->io_error) { |
| data->error = usdhi6_error_code(host); |
| data->bytes_xfered = 0; |
| usdhi6_dma_kill(host); |
| usdhi6_dma_release(host); |
| dev_warn(mmc_dev(host->mmc), |
| "DMA failed: %d, falling back to PIO\n", data->error); |
| return; |
| } |
| |
| /* |
| * The datasheet tells us to check a response from the card, whereas |
| * responses only come after the command phase, not after the data |
| * phase. Let's check anyway. |
| */ |
| if (host->irq_status & USDHI6_SD_INFO1_RSP_END) |
| dev_warn(mmc_dev(host->mmc), "Unexpected response received!\n"); |
| } |
| |
| static void usdhi6_dma_kick(struct usdhi6_host *host) |
| { |
| if (host->mrq->data->flags & MMC_DATA_READ) |
| dma_async_issue_pending(host->chan_rx); |
| else |
| dma_async_issue_pending(host->chan_tx); |
| } |
| |
| static void usdhi6_dma_request(struct usdhi6_host *host, phys_addr_t start) |
| { |
| struct dma_slave_config cfg = { |
| .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, |
| .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, |
| }; |
| int ret; |
| |
| host->chan_tx = dma_request_slave_channel(mmc_dev(host->mmc), "tx"); |
| dev_dbg(mmc_dev(host->mmc), "%s: TX: got channel %p\n", __func__, |
| host->chan_tx); |
| |
| if (!host->chan_tx) |
| return; |
| |
| cfg.direction = DMA_MEM_TO_DEV; |
| cfg.dst_addr = start + USDHI6_SD_BUF0; |
| cfg.dst_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */ |
| cfg.src_addr = 0; |
| ret = dmaengine_slave_config(host->chan_tx, &cfg); |
| if (ret < 0) |
| goto e_release_tx; |
| |
| host->chan_rx = dma_request_slave_channel(mmc_dev(host->mmc), "rx"); |
| dev_dbg(mmc_dev(host->mmc), "%s: RX: got channel %p\n", __func__, |
| host->chan_rx); |
| |
| if (!host->chan_rx) |
| goto e_release_tx; |
| |
| cfg.direction = DMA_DEV_TO_MEM; |
| cfg.src_addr = cfg.dst_addr; |
| cfg.src_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */ |
| cfg.dst_addr = 0; |
| ret = dmaengine_slave_config(host->chan_rx, &cfg); |
| if (ret < 0) |
| goto e_release_rx; |
| |
| return; |
| |
| e_release_rx: |
| dma_release_channel(host->chan_rx); |
| host->chan_rx = NULL; |
| e_release_tx: |
| dma_release_channel(host->chan_tx); |
| host->chan_tx = NULL; |
| } |
| |
| /* API helpers */ |
| |
| static void usdhi6_clk_set(struct usdhi6_host *host, struct mmc_ios *ios) |
| { |
| unsigned long rate = ios->clock; |
| u32 val; |
| unsigned int i; |
| |
| for (i = 1000; i; i--) { |
| if (usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_SCLKDIVEN) |
| break; |
| usleep_range(10, 100); |
| } |
| |
| if (!i) { |
| dev_err(mmc_dev(host->mmc), "SD bus busy, clock set aborted\n"); |
| return; |
| } |
| |
| val = usdhi6_read(host, USDHI6_SD_CLK_CTRL) & ~USDHI6_SD_CLK_CTRL_DIV_MASK; |
| |
| if (rate) { |
| unsigned long new_rate; |
| |
| if (host->imclk <= rate) { |
| if (ios->timing != MMC_TIMING_UHS_DDR50) { |
| /* Cannot have 1-to-1 clock in DDR mode */ |
| new_rate = host->imclk; |
| val |= 0xff; |
| } else { |
| new_rate = host->imclk / 2; |
| } |
| } else { |
| unsigned long div = |
| roundup_pow_of_two(DIV_ROUND_UP(host->imclk, rate)); |
| val |= div >> 2; |
| new_rate = host->imclk / div; |
| } |
| |
| if (host->rate == new_rate) |
| return; |
| |
| host->rate = new_rate; |
| |
| dev_dbg(mmc_dev(host->mmc), "target %lu, div %u, set %lu\n", |
| rate, (val & 0xff) << 2, new_rate); |
| } |
| |
| /* |
| * if old or new rate is equal to input rate, have to switch the clock |
| * off before changing and on after |
| */ |
| if (host->imclk == rate || host->imclk == host->rate || !rate) |
| usdhi6_write(host, USDHI6_SD_CLK_CTRL, |
| val & ~USDHI6_SD_CLK_CTRL_SCLKEN); |
| |
| if (!rate) { |
| host->rate = 0; |
| return; |
| } |
| |
| usdhi6_write(host, USDHI6_SD_CLK_CTRL, val); |
| |
| if (host->imclk == rate || host->imclk == host->rate || |
| !(val & USDHI6_SD_CLK_CTRL_SCLKEN)) |
| usdhi6_write(host, USDHI6_SD_CLK_CTRL, |
| val | USDHI6_SD_CLK_CTRL_SCLKEN); |
| } |
| |
| static void usdhi6_set_power(struct usdhi6_host *host, struct mmc_ios *ios) |
| { |
| struct mmc_host *mmc = host->mmc; |
| |
| if (!IS_ERR(mmc->supply.vmmc)) |
| /* Errors ignored... */ |
| mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, |
| ios->power_mode ? ios->vdd : 0); |
| } |
| |
| static int usdhi6_reset(struct usdhi6_host *host) |
| { |
| int i; |
| |
| usdhi6_write(host, USDHI6_SOFT_RST, USDHI6_SOFT_RST_RESERVED); |
| cpu_relax(); |
| usdhi6_write(host, USDHI6_SOFT_RST, USDHI6_SOFT_RST_RESERVED | USDHI6_SOFT_RST_RESET); |
| for (i = 1000; i; i--) |
| if (usdhi6_read(host, USDHI6_SOFT_RST) & USDHI6_SOFT_RST_RESET) |
| break; |
| |
| return i ? 0 : -ETIMEDOUT; |
| } |
| |
| static void usdhi6_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) |
| { |
| struct usdhi6_host *host = mmc_priv(mmc); |
| u32 option, mode; |
| int ret; |
| |
| dev_dbg(mmc_dev(mmc), "%uHz, OCR: %u, power %u, bus-width %u, timing %u\n", |
| ios->clock, ios->vdd, ios->power_mode, ios->bus_width, ios->timing); |
| |
| switch (ios->power_mode) { |
| case MMC_POWER_OFF: |
| usdhi6_set_power(host, ios); |
| usdhi6_only_cd(host); |
| break; |
| case MMC_POWER_UP: |
| /* |
| * We only also touch USDHI6_SD_OPTION from .request(), which |
| * cannot race with MMC_POWER_UP |
| */ |
| ret = usdhi6_reset(host); |
| if (ret < 0) { |
| dev_err(mmc_dev(mmc), "Cannot reset the interface!\n"); |
| } else { |
| usdhi6_set_power(host, ios); |
| usdhi6_only_cd(host); |
| } |
| break; |
| case MMC_POWER_ON: |
| option = usdhi6_read(host, USDHI6_SD_OPTION); |
| /* |
| * The eMMC standard only allows 4 or 8 bits in the DDR mode, |
| * the same probably holds for SD cards. We check here anyway, |
| * since the datasheet explicitly requires 4 bits for DDR. |
| */ |
| if (ios->bus_width == MMC_BUS_WIDTH_1) { |
| if (ios->timing == MMC_TIMING_UHS_DDR50) |
| dev_err(mmc_dev(mmc), |
| "4 bits are required for DDR\n"); |
| option |= USDHI6_SD_OPTION_WIDTH_1; |
| mode = 0; |
| } else { |
| option &= ~USDHI6_SD_OPTION_WIDTH_1; |
| mode = ios->timing == MMC_TIMING_UHS_DDR50; |
| } |
| usdhi6_write(host, USDHI6_SD_OPTION, option); |
| usdhi6_write(host, USDHI6_SDIF_MODE, mode); |
| break; |
| } |
| |
| if (host->rate != ios->clock) |
| usdhi6_clk_set(host, ios); |
| } |
| |
| /* This is data timeout. Response timeout is fixed to 640 clock cycles */ |
| static void usdhi6_timeout_set(struct usdhi6_host *host) |
| { |
| struct mmc_request *mrq = host->mrq; |
| u32 val; |
| unsigned long ticks; |
| |
| if (!mrq->data) |
| ticks = host->rate / 1000 * mrq->cmd->busy_timeout; |
| else |
| ticks = host->rate / 1000000 * (mrq->data->timeout_ns / 1000) + |
| mrq->data->timeout_clks; |
| |
| if (!ticks || ticks > 1 << 27) |
| /* Max timeout */ |
| val = 14; |
| else if (ticks < 1 << 13) |
| /* Min timeout */ |
| val = 0; |
| else |
| val = order_base_2(ticks) - 13; |
| |
| dev_dbg(mmc_dev(host->mmc), "Set %s timeout %lu ticks @ %lu Hz\n", |
| mrq->data ? "data" : "cmd", ticks, host->rate); |
| |
| /* Timeout Counter mask: 0xf0 */ |
| usdhi6_write(host, USDHI6_SD_OPTION, (val << USDHI6_SD_OPTION_TIMEOUT_SHIFT) | |
| (usdhi6_read(host, USDHI6_SD_OPTION) & ~USDHI6_SD_OPTION_TIMEOUT_MASK)); |
| } |
| |
| static void usdhi6_request_done(struct usdhi6_host *host) |
| { |
| struct mmc_request *mrq = host->mrq; |
| struct mmc_data *data = mrq->data; |
| |
| if (WARN(host->pg.page || host->head_pg.page, |
| "Page %p or %p not unmapped: wait %u, CMD%d(%c) @ +0x%zx %ux%u in SG%u!\n", |
| host->pg.page, host->head_pg.page, host->wait, mrq->cmd->opcode, |
| data ? (data->flags & MMC_DATA_READ ? 'R' : 'W') : '-', |
| data ? host->offset : 0, data ? data->blocks : 0, |
| data ? data->blksz : 0, data ? data->sg_len : 0)) |
| usdhi6_sg_unmap(host, true); |
| |
| if (mrq->cmd->error || |
| (data && data->error) || |
| (mrq->stop && mrq->stop->error)) |
| dev_dbg(mmc_dev(host->mmc), "%s(CMD%d: %ux%u): err %d %d %d\n", |
| __func__, mrq->cmd->opcode, data ? data->blocks : 0, |
| data ? data->blksz : 0, |
| mrq->cmd->error, |
| data ? data->error : 1, |
| mrq->stop ? mrq->stop->error : 1); |
| |
| /* Disable DMA */ |
| usdhi6_write(host, USDHI6_CC_EXT_MODE, 0); |
| host->wait = USDHI6_WAIT_FOR_REQUEST; |
| host->mrq = NULL; |
| |
| mmc_request_done(host->mmc, mrq); |
| } |
| |
| static int usdhi6_cmd_flags(struct usdhi6_host *host) |
| { |
| struct mmc_request *mrq = host->mrq; |
| struct mmc_command *cmd = mrq->cmd; |
| u16 opc = cmd->opcode; |
| |
| if (host->app_cmd) { |
| host->app_cmd = false; |
| opc |= USDHI6_SD_CMD_APP; |
| } |
| |
| if (mrq->data) { |
| opc |= USDHI6_SD_CMD_DATA; |
| |
| if (mrq->data->flags & MMC_DATA_READ) |
| opc |= USDHI6_SD_CMD_READ; |
| |
| if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || |
| cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || |
| (cmd->opcode == SD_IO_RW_EXTENDED && |
| mrq->data->blocks > 1)) { |
| opc |= USDHI6_SD_CMD_MULTI; |
| if (!mrq->stop) |
| opc |= USDHI6_SD_CMD_CMD12_AUTO_OFF; |
| } |
| |
| switch (mmc_resp_type(cmd)) { |
| case MMC_RSP_NONE: |
| opc |= USDHI6_SD_CMD_MODE_RSP_NONE; |
| break; |
| case MMC_RSP_R1: |
| opc |= USDHI6_SD_CMD_MODE_RSP_R1; |
| break; |
| case MMC_RSP_R1B: |
| opc |= USDHI6_SD_CMD_MODE_RSP_R1B; |
| break; |
| case MMC_RSP_R2: |
| opc |= USDHI6_SD_CMD_MODE_RSP_R2; |
| break; |
| case MMC_RSP_R3: |
| opc |= USDHI6_SD_CMD_MODE_RSP_R3; |
| break; |
| default: |
| dev_warn(mmc_dev(host->mmc), |
| "Unknown response type %d\n", |
| mmc_resp_type(cmd)); |
| return -EINVAL; |
| } |
| } |
| |
| return opc; |
| } |
| |
| static int usdhi6_rq_start(struct usdhi6_host *host) |
| { |
| struct mmc_request *mrq = host->mrq; |
| struct mmc_command *cmd = mrq->cmd; |
| struct mmc_data *data = mrq->data; |
| int opc = usdhi6_cmd_flags(host); |
| int i; |
| |
| if (opc < 0) |
| return opc; |
| |
| for (i = 1000; i; i--) { |
| if (!(usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_CBSY)) |
| break; |
| usleep_range(10, 100); |
| } |
| |
| if (!i) { |
| dev_dbg(mmc_dev(host->mmc), "Command active, request aborted\n"); |
| return -EAGAIN; |
| } |
| |
| if (data) { |
| bool use_dma; |
| int ret = 0; |
| |
| host->page_idx = 0; |
| |
| if (cmd->opcode == SD_IO_RW_EXTENDED && data->blocks > 1) { |
| switch (data->blksz) { |
| case 512: |
| break; |
| case 32: |
| case 64: |
| case 128: |
| case 256: |
| if (mrq->stop) |
| ret = -EINVAL; |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| } else if ((cmd->opcode == MMC_READ_MULTIPLE_BLOCK || |
| cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) && |
| data->blksz != 512) { |
| ret = -EINVAL; |
| } |
| |
| if (ret < 0) { |
| dev_warn(mmc_dev(host->mmc), "%s(): %u blocks of %u bytes\n", |
| __func__, data->blocks, data->blksz); |
| return -EINVAL; |
| } |
| |
| if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || |
| cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || |
| (cmd->opcode == SD_IO_RW_EXTENDED && |
| data->blocks > 1)) |
| usdhi6_sg_prep(host); |
| |
| usdhi6_write(host, USDHI6_SD_SIZE, data->blksz); |
| |
| if ((data->blksz >= USDHI6_MIN_DMA || |
| data->blocks > 1) && |
| (data->blksz % 4 || |
| data->sg->offset % 4)) |
| dev_dbg(mmc_dev(host->mmc), |
| "Bad SG of %u: %ux%u @ %u\n", data->sg_len, |
| data->blksz, data->blocks, data->sg->offset); |
| |
| /* Enable DMA for USDHI6_MIN_DMA bytes or more */ |
| use_dma = data->blksz >= USDHI6_MIN_DMA && |
| !(data->blksz % 4) && |
| usdhi6_dma_start(host) >= DMA_MIN_COOKIE; |
| |
| if (use_dma) |
| usdhi6_write(host, USDHI6_CC_EXT_MODE, USDHI6_CC_EXT_MODE_SDRW); |
| |
| dev_dbg(mmc_dev(host->mmc), |
| "%s(): request opcode %u, %u blocks of %u bytes in %u segments, %s %s @+0x%x%s\n", |
| __func__, cmd->opcode, data->blocks, data->blksz, |
| data->sg_len, use_dma ? "DMA" : "PIO", |
| data->flags & MMC_DATA_READ ? "read" : "write", |
| data->sg->offset, mrq->stop ? " + stop" : ""); |
| } else { |
| dev_dbg(mmc_dev(host->mmc), "%s(): request opcode %u\n", |
| __func__, cmd->opcode); |
| } |
| |
| /* We have to get a command completion interrupt with DMA too */ |
| usdhi6_wait_for_resp(host); |
| |
| host->wait = USDHI6_WAIT_FOR_CMD; |
| schedule_delayed_work(&host->timeout_work, host->timeout); |
| |
| /* SEC bit is required to enable block counting by the core */ |
| usdhi6_write(host, USDHI6_SD_STOP, |
| data && data->blocks > 1 ? USDHI6_SD_STOP_SEC : 0); |
| usdhi6_write(host, USDHI6_SD_ARG, cmd->arg); |
| |
| /* Kick command execution */ |
| usdhi6_write(host, USDHI6_SD_CMD, opc); |
| |
| return 0; |
| } |
| |
| static void usdhi6_request(struct mmc_host *mmc, struct mmc_request *mrq) |
| { |
| struct usdhi6_host *host = mmc_priv(mmc); |
| int ret; |
| |
| cancel_delayed_work_sync(&host->timeout_work); |
| |
| host->mrq = mrq; |
| host->sg = NULL; |
| |
| usdhi6_timeout_set(host); |
| ret = usdhi6_rq_start(host); |
| if (ret < 0) { |
| mrq->cmd->error = ret; |
| usdhi6_request_done(host); |
| } |
| } |
| |
| static int usdhi6_get_cd(struct mmc_host *mmc) |
| { |
| struct usdhi6_host *host = mmc_priv(mmc); |
| /* Read is atomic, no need to lock */ |
| u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_CD; |
| |
| /* |
| * level status.CD CD_ACTIVE_HIGH card present |
| * 1 0 0 0 |
| * 1 0 1 1 |
| * 0 1 0 1 |
| * 0 1 1 0 |
| */ |
| return !status ^ !(mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH); |
| } |
| |
| static int usdhi6_get_ro(struct mmc_host *mmc) |
| { |
| struct usdhi6_host *host = mmc_priv(mmc); |
| /* No locking as above */ |
| u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_WP; |
| |
| /* |
| * level status.WP RO_ACTIVE_HIGH card read-only |
| * 1 0 0 0 |
| * 1 0 1 1 |
| * 0 1 0 1 |
| * 0 1 1 0 |
| */ |
| return !status ^ !(mmc->caps2 & MMC_CAP2_RO_ACTIVE_HIGH); |
| } |
| |
| static void usdhi6_enable_sdio_irq(struct mmc_host *mmc, int enable) |
| { |
| struct usdhi6_host *host = mmc_priv(mmc); |
| |
| dev_dbg(mmc_dev(mmc), "%s(): %sable\n", __func__, enable ? "en" : "dis"); |
| |
| if (enable) { |
| host->sdio_mask = USDHI6_SDIO_INFO1_IRQ & ~USDHI6_SDIO_INFO1_IOIRQ; |
| usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, host->sdio_mask); |
| usdhi6_write(host, USDHI6_SDIO_MODE, 1); |
| } else { |
| usdhi6_write(host, USDHI6_SDIO_MODE, 0); |
| usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, USDHI6_SDIO_INFO1_IRQ); |
| host->sdio_mask = USDHI6_SDIO_INFO1_IRQ; |
| } |
| } |
| |
| static struct mmc_host_ops usdhi6_ops = { |
| .request = usdhi6_request, |
| .set_ios = usdhi6_set_ios, |
| .get_cd = usdhi6_get_cd, |
| .get_ro = usdhi6_get_ro, |
| .enable_sdio_irq = usdhi6_enable_sdio_irq, |
| }; |
| |
| /* State machine handlers */ |
| |
| static void usdhi6_resp_cmd12(struct usdhi6_host *host) |
| { |
| struct mmc_command *cmd = host->mrq->stop; |
| cmd->resp[0] = usdhi6_read(host, USDHI6_SD_RSP10); |
| } |
| |
| static void usdhi6_resp_read(struct usdhi6_host *host) |
| { |
| struct mmc_command *cmd = host->mrq->cmd; |
| u32 *rsp = cmd->resp, tmp = 0; |
| int i; |
| |
| /* |
| * RSP10 39-8 |
| * RSP32 71-40 |
| * RSP54 103-72 |
| * RSP76 127-104 |
| * R2-type response: |
| * resp[0] = r[127..96] |
| * resp[1] = r[95..64] |
| * resp[2] = r[63..32] |
| * resp[3] = r[31..0] |
| * Other responses: |
| * resp[0] = r[39..8] |
| */ |
| |
| if (mmc_resp_type(cmd) == MMC_RSP_NONE) |
| return; |
| |
| if (!(host->irq_status & USDHI6_SD_INFO1_RSP_END)) { |
| dev_err(mmc_dev(host->mmc), |
| "CMD%d: response expected but is missing!\n", cmd->opcode); |
| return; |
| } |
| |
| if (mmc_resp_type(cmd) & MMC_RSP_136) |
| for (i = 0; i < 4; i++) { |
| if (i) |
| rsp[3 - i] = tmp >> 24; |
| tmp = usdhi6_read(host, USDHI6_SD_RSP10 + i * 8); |
| rsp[3 - i] |= tmp << 8; |
| } |
| else if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || |
| cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) |
| /* Read RSP54 to avoid conflict with auto CMD12 */ |
| rsp[0] = usdhi6_read(host, USDHI6_SD_RSP54); |
| else |
| rsp[0] = usdhi6_read(host, USDHI6_SD_RSP10); |
| |
| dev_dbg(mmc_dev(host->mmc), "Response 0x%x\n", rsp[0]); |
| } |
| |
| static int usdhi6_blk_read(struct usdhi6_host *host) |
| { |
| struct mmc_data *data = host->mrq->data; |
| u32 *p; |
| int i, rest; |
| |
| if (host->io_error) { |
| data->error = usdhi6_error_code(host); |
| goto error; |
| } |
| |
| if (host->pg.page) { |
| p = host->blk_page + host->offset; |
| } else { |
| p = usdhi6_sg_map(host); |
| if (!p) { |
| data->error = -ENOMEM; |
| goto error; |
| } |
| } |
| |
| for (i = 0; i < data->blksz / 4; i++, p++) |
| *p = usdhi6_read(host, USDHI6_SD_BUF0); |
| |
| rest = data->blksz % 4; |
| for (i = 0; i < (rest + 1) / 2; i++) { |
| u16 d = usdhi6_read16(host, USDHI6_SD_BUF0); |
| ((u8 *)p)[2 * i] = ((u8 *)&d)[0]; |
| if (rest > 1 && !i) |
| ((u8 *)p)[2 * i + 1] = ((u8 *)&d)[1]; |
| } |
| |
| return 0; |
| |
| error: |
| dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error); |
| host->wait = USDHI6_WAIT_FOR_REQUEST; |
| return data->error; |
| } |
| |
| static int usdhi6_blk_write(struct usdhi6_host *host) |
| { |
| struct mmc_data *data = host->mrq->data; |
| u32 *p; |
| int i, rest; |
| |
| if (host->io_error) { |
| data->error = usdhi6_error_code(host); |
| goto error; |
| } |
| |
| if (host->pg.page) { |
| p = host->blk_page + host->offset; |
| } else { |
| p = usdhi6_sg_map(host); |
| if (!p) { |
| data->error = -ENOMEM; |
| goto error; |
| } |
| } |
| |
| for (i = 0; i < data->blksz / 4; i++, p++) |
| usdhi6_write(host, USDHI6_SD_BUF0, *p); |
| |
| rest = data->blksz % 4; |
| for (i = 0; i < (rest + 1) / 2; i++) { |
| u16 d; |
| ((u8 *)&d)[0] = ((u8 *)p)[2 * i]; |
| if (rest > 1 && !i) |
| ((u8 *)&d)[1] = ((u8 *)p)[2 * i + 1]; |
| else |
| ((u8 *)&d)[1] = 0; |
| usdhi6_write16(host, USDHI6_SD_BUF0, d); |
| } |
| |
| return 0; |
| |
| error: |
| dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error); |
| host->wait = USDHI6_WAIT_FOR_REQUEST; |
| return data->error; |
| } |
| |
| static int usdhi6_stop_cmd(struct usdhi6_host *host) |
| { |
| struct mmc_request *mrq = host->mrq; |
| |
| switch (mrq->cmd->opcode) { |
| case MMC_READ_MULTIPLE_BLOCK: |
| case MMC_WRITE_MULTIPLE_BLOCK: |
| if (mrq->stop->opcode == MMC_STOP_TRANSMISSION) { |
| host->wait = USDHI6_WAIT_FOR_STOP; |
| return 0; |
| } |
| /* Unsupported STOP command */ |
| default: |
| dev_err(mmc_dev(host->mmc), |
| "unsupported stop CMD%d for CMD%d\n", |
| mrq->stop->opcode, mrq->cmd->opcode); |
| mrq->stop->error = -EOPNOTSUPP; |
| } |
| |
| return -EOPNOTSUPP; |
| } |
| |
| static bool usdhi6_end_cmd(struct usdhi6_host *host) |
| { |
| struct mmc_request *mrq = host->mrq; |
| struct mmc_command *cmd = mrq->cmd; |
| |
| if (host->io_error) { |
| cmd->error = usdhi6_error_code(host); |
| return false; |
| } |
| |
| usdhi6_resp_read(host); |
| |
| if (!mrq->data) |
| return false; |
| |
| if (host->dma_active) { |
| usdhi6_dma_kick(host); |
| if (!mrq->stop) |
| host->wait = USDHI6_WAIT_FOR_DMA; |
| else if (usdhi6_stop_cmd(host) < 0) |
| return false; |
| } else if (mrq->data->flags & MMC_DATA_READ) { |
| if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || |
| (cmd->opcode == SD_IO_RW_EXTENDED && |
| mrq->data->blocks > 1)) |
| host->wait = USDHI6_WAIT_FOR_MREAD; |
| else |
| host->wait = USDHI6_WAIT_FOR_READ; |
| } else { |
| if (cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || |
| (cmd->opcode == SD_IO_RW_EXTENDED && |
| mrq->data->blocks > 1)) |
| host->wait = USDHI6_WAIT_FOR_MWRITE; |
| else |
| host->wait = USDHI6_WAIT_FOR_WRITE; |
| } |
| |
| return true; |
| } |
| |
| static bool usdhi6_read_block(struct usdhi6_host *host) |
| { |
| /* ACCESS_END IRQ is already unmasked */ |
| int ret = usdhi6_blk_read(host); |
| |
| /* |
| * Have to force unmapping both pages: the single block could have been |
| * cross-page, in which case for single-block IO host->page_idx == 0. |
| * So, if we don't force, the second page won't be unmapped. |
| */ |
| usdhi6_sg_unmap(host, true); |
| |
| if (ret < 0) |
| return false; |
| |
| host->wait = USDHI6_WAIT_FOR_DATA_END; |
| return true; |
| } |
| |
| static bool usdhi6_mread_block(struct usdhi6_host *host) |
| { |
| int ret = usdhi6_blk_read(host); |
| |
| if (ret < 0) |
| return false; |
| |
| usdhi6_sg_advance(host); |
| |
| return !host->mrq->data->error && |
| (host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop); |
| } |
| |
| static bool usdhi6_write_block(struct usdhi6_host *host) |
| { |
| int ret = usdhi6_blk_write(host); |
| |
| /* See comment in usdhi6_read_block() */ |
| usdhi6_sg_unmap(host, true); |
| |
| if (ret < 0) |
| return false; |
| |
| host->wait = USDHI6_WAIT_FOR_DATA_END; |
| return true; |
| } |
| |
| static bool usdhi6_mwrite_block(struct usdhi6_host *host) |
| { |
| int ret = usdhi6_blk_write(host); |
| |
| if (ret < 0) |
| return false; |
| |
| usdhi6_sg_advance(host); |
| |
| return !host->mrq->data->error && |
| (host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop); |
| } |
| |
| /* Interrupt & timeout handlers */ |
| |
| static irqreturn_t usdhi6_sd_bh(int irq, void *dev_id) |
| { |
| struct usdhi6_host *host = dev_id; |
| struct mmc_request *mrq; |
| struct mmc_command *cmd; |
| struct mmc_data *data; |
| bool io_wait = false; |
| |
| cancel_delayed_work_sync(&host->timeout_work); |
| |
| mrq = host->mrq; |
| if (!mrq) |
| return IRQ_HANDLED; |
| |
| cmd = mrq->cmd; |
| data = mrq->data; |
| |
| switch (host->wait) { |
| case USDHI6_WAIT_FOR_REQUEST: |
| /* We're too late, the timeout has already kicked in */ |
| return IRQ_HANDLED; |
| case USDHI6_WAIT_FOR_CMD: |
| /* Wait for data? */ |
| io_wait = usdhi6_end_cmd(host); |
| break; |
| case USDHI6_WAIT_FOR_MREAD: |
| /* Wait for more data? */ |
| io_wait = usdhi6_mread_block(host); |
| break; |
| case USDHI6_WAIT_FOR_READ: |
| /* Wait for data end? */ |
| io_wait = usdhi6_read_block(host); |
| break; |
| case USDHI6_WAIT_FOR_MWRITE: |
| /* Wait data to write? */ |
| io_wait = usdhi6_mwrite_block(host); |
| break; |
| case USDHI6_WAIT_FOR_WRITE: |
| /* Wait for data end? */ |
| io_wait = usdhi6_write_block(host); |
| break; |
| case USDHI6_WAIT_FOR_DMA: |
| usdhi6_dma_check_error(host); |
| break; |
| case USDHI6_WAIT_FOR_STOP: |
| usdhi6_write(host, USDHI6_SD_STOP, 0); |
| if (host->io_error) { |
| int ret = usdhi6_error_code(host); |
| if (mrq->stop) |
| mrq->stop->error = ret; |
| else |
| mrq->data->error = ret; |
| dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__, ret); |
| break; |
| } |
| usdhi6_resp_cmd12(host); |
| mrq->stop->error = 0; |
| break; |
| case USDHI6_WAIT_FOR_DATA_END: |
| if (host->io_error) { |
| mrq->data->error = usdhi6_error_code(host); |
| dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__, |
| mrq->data->error); |
| } |
| break; |
| default: |
| cmd->error = -EFAULT; |
| dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait); |
| usdhi6_request_done(host); |
| return IRQ_HANDLED; |
| } |
| |
| if (io_wait) { |
| schedule_delayed_work(&host->timeout_work, host->timeout); |
| /* Wait for more data or ACCESS_END */ |
| if (!host->dma_active) |
| usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ); |
| return IRQ_HANDLED; |
| } |
| |
| if (!cmd->error) { |
| if (data) { |
| if (!data->error) { |
| if (host->wait != USDHI6_WAIT_FOR_STOP && |
| host->mrq->stop && |
| !host->mrq->stop->error && |
| !usdhi6_stop_cmd(host)) { |
| /* Sending STOP */ |
| usdhi6_wait_for_resp(host); |
| |
| schedule_delayed_work(&host->timeout_work, |
| host->timeout); |
| |
| return IRQ_HANDLED; |
| } |
| |
| data->bytes_xfered = data->blocks * data->blksz; |
| } else { |
| /* Data error: might need to unmap the last page */ |
| dev_warn(mmc_dev(host->mmc), "%s(): data error %d\n", |
| __func__, data->error); |
| usdhi6_sg_unmap(host, true); |
| } |
| } else if (cmd->opcode == MMC_APP_CMD) { |
| host->app_cmd = true; |
| } |
| } |
| |
| usdhi6_request_done(host); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t usdhi6_sd(int irq, void *dev_id) |
| { |
| struct usdhi6_host *host = dev_id; |
| u16 status, status2, error; |
| |
| status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask & |
| ~USDHI6_SD_INFO1_CARD; |
| status2 = usdhi6_read(host, USDHI6_SD_INFO2) & ~host->status2_mask; |
| |
| usdhi6_only_cd(host); |
| |
| dev_dbg(mmc_dev(host->mmc), |
| "IRQ status = 0x%08x, status2 = 0x%08x\n", status, status2); |
| |
| if (!status && !status2) |
| return IRQ_NONE; |
| |
| error = status2 & USDHI6_SD_INFO2_ERR; |
| |
| /* Ack / clear interrupts */ |
| if (USDHI6_SD_INFO1_IRQ & status) |
| usdhi6_write(host, USDHI6_SD_INFO1, |
| 0xffff & ~(USDHI6_SD_INFO1_IRQ & status)); |
| |
| if (USDHI6_SD_INFO2_IRQ & status2) { |
| if (error) |
| /* In error cases BWE and BRE aren't cleared automatically */ |
| status2 |= USDHI6_SD_INFO2_BWE | USDHI6_SD_INFO2_BRE; |
| |
| usdhi6_write(host, USDHI6_SD_INFO2, |
| 0xffff & ~(USDHI6_SD_INFO2_IRQ & status2)); |
| } |
| |
| host->io_error = error; |
| host->irq_status = status; |
| |
| if (error) { |
| /* Don't pollute the log with unsupported command timeouts */ |
| if (host->wait != USDHI6_WAIT_FOR_CMD || |
| error != USDHI6_SD_INFO2_RSP_TOUT) |
| dev_warn(mmc_dev(host->mmc), |
| "%s(): INFO2 error bits 0x%08x\n", |
| __func__, error); |
| else |
| dev_dbg(mmc_dev(host->mmc), |
| "%s(): INFO2 error bits 0x%08x\n", |
| __func__, error); |
| } |
| |
| return IRQ_WAKE_THREAD; |
| } |
| |
| static irqreturn_t usdhi6_sdio(int irq, void *dev_id) |
| { |
| struct usdhi6_host *host = dev_id; |
| u32 status = usdhi6_read(host, USDHI6_SDIO_INFO1) & ~host->sdio_mask; |
| |
| dev_dbg(mmc_dev(host->mmc), "%s(): status 0x%x\n", __func__, status); |
| |
| if (!status) |
| return IRQ_NONE; |
| |
| usdhi6_write(host, USDHI6_SDIO_INFO1, ~status); |
| |
| mmc_signal_sdio_irq(host->mmc); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t usdhi6_cd(int irq, void *dev_id) |
| { |
| struct usdhi6_host *host = dev_id; |
| struct mmc_host *mmc = host->mmc; |
| u16 status; |
| |
| /* We're only interested in hotplug events here */ |
| status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask & |
| USDHI6_SD_INFO1_CARD; |
| |
| if (!status) |
| return IRQ_NONE; |
| |
| /* Ack */ |
| usdhi6_write(host, USDHI6_SD_INFO1, ~status); |
| |
| if (!work_pending(&mmc->detect.work) && |
| (((status & USDHI6_SD_INFO1_CARD_INSERT) && |
| !mmc->card) || |
| ((status & USDHI6_SD_INFO1_CARD_EJECT) && |
| mmc->card))) |
| mmc_detect_change(mmc, msecs_to_jiffies(100)); |
| |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| * Actually this should not be needed, if the built-in timeout works reliably in |
| * the both PIO cases and DMA never fails. But if DMA does fail, a timeout |
| * handler might be the only way to catch the error. |
| */ |
| static void usdhi6_timeout_work(struct work_struct *work) |
| { |
| struct delayed_work *d = to_delayed_work(work); |
| struct usdhi6_host *host = container_of(d, struct usdhi6_host, timeout_work); |
| struct mmc_request *mrq = host->mrq; |
| struct mmc_data *data = mrq ? mrq->data : NULL; |
| struct scatterlist *sg; |
| |
| dev_warn(mmc_dev(host->mmc), |
| "%s timeout wait %u CMD%d: IRQ 0x%08x:0x%08x, last IRQ 0x%08x\n", |
| host->dma_active ? "DMA" : "PIO", |
| host->wait, mrq ? mrq->cmd->opcode : -1, |
| usdhi6_read(host, USDHI6_SD_INFO1), |
| usdhi6_read(host, USDHI6_SD_INFO2), host->irq_status); |
| |
| if (host->dma_active) { |
| usdhi6_dma_kill(host); |
| usdhi6_dma_stop_unmap(host); |
| } |
| |
| switch (host->wait) { |
| default: |
| dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait); |
| /* mrq can be NULL in this actually impossible case */ |
| case USDHI6_WAIT_FOR_CMD: |
| usdhi6_error_code(host); |
| if (mrq) |
| mrq->cmd->error = -ETIMEDOUT; |
| break; |
| case USDHI6_WAIT_FOR_STOP: |
| usdhi6_error_code(host); |
| mrq->stop->error = -ETIMEDOUT; |
| break; |
| case USDHI6_WAIT_FOR_DMA: |
| case USDHI6_WAIT_FOR_MREAD: |
| case USDHI6_WAIT_FOR_MWRITE: |
| case USDHI6_WAIT_FOR_READ: |
| case USDHI6_WAIT_FOR_WRITE: |
| sg = host->sg ?: data->sg; |
| dev_dbg(mmc_dev(host->mmc), |
| "%c: page #%u @ +0x%zx %ux%u in SG%u. Current SG %u bytes @ %u\n", |
| data->flags & MMC_DATA_READ ? 'R' : 'W', host->page_idx, |
| host->offset, data->blocks, data->blksz, data->sg_len, |
| sg_dma_len(sg), sg->offset); |
| usdhi6_sg_unmap(host, true); |
| /* |
| * If USDHI6_WAIT_FOR_DATA_END times out, we have already unmapped |
| * the page |
| */ |
| case USDHI6_WAIT_FOR_DATA_END: |
| usdhi6_error_code(host); |
| data->error = -ETIMEDOUT; |
| } |
| |
| if (mrq) |
| usdhi6_request_done(host); |
| } |
| |
| /* Probe / release */ |
| |
| static const struct of_device_id usdhi6_of_match[] = { |
| {.compatible = "renesas,usdhi6rol0"}, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, usdhi6_of_match); |
| |
| static int usdhi6_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct mmc_host *mmc; |
| struct usdhi6_host *host; |
| struct resource *res; |
| int irq_cd, irq_sd, irq_sdio; |
| u32 version; |
| int ret; |
| |
| if (!dev->of_node) |
| return -ENODEV; |
| |
| irq_cd = platform_get_irq_byname(pdev, "card detect"); |
| irq_sd = platform_get_irq_byname(pdev, "data"); |
| irq_sdio = platform_get_irq_byname(pdev, "SDIO"); |
| if (irq_sd < 0 || irq_sdio < 0) |
| return -ENODEV; |
| |
| mmc = mmc_alloc_host(sizeof(struct usdhi6_host), dev); |
| if (!mmc) |
| return -ENOMEM; |
| |
| ret = mmc_regulator_get_supply(mmc); |
| if (ret == -EPROBE_DEFER) |
| goto e_free_mmc; |
| |
| ret = mmc_of_parse(mmc); |
| if (ret < 0) |
| goto e_free_mmc; |
| |
| host = mmc_priv(mmc); |
| host->mmc = mmc; |
| host->wait = USDHI6_WAIT_FOR_REQUEST; |
| host->timeout = msecs_to_jiffies(4000); |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| host->base = devm_ioremap_resource(dev, res); |
| if (IS_ERR(host->base)) { |
| ret = PTR_ERR(host->base); |
| goto e_free_mmc; |
| } |
| |
| host->clk = devm_clk_get(dev, NULL); |
| if (IS_ERR(host->clk)) { |
| ret = PTR_ERR(host->clk); |
| goto e_free_mmc; |
| } |
| |
| host->imclk = clk_get_rate(host->clk); |
| |
| ret = clk_prepare_enable(host->clk); |
| if (ret < 0) |
| goto e_free_mmc; |
| |
| version = usdhi6_read(host, USDHI6_VERSION); |
| if ((version & 0xfff) != 0xa0d) { |
| dev_err(dev, "Version not recognized %x\n", version); |
| goto e_clk_off; |
| } |
| |
| dev_info(dev, "A USDHI6ROL0 SD host detected with %d ports\n", |
| usdhi6_read(host, USDHI6_SD_PORT_SEL) >> USDHI6_SD_PORT_SEL_PORTS_SHIFT); |
| |
| usdhi6_mask_all(host); |
| |
| if (irq_cd >= 0) { |
| ret = devm_request_irq(dev, irq_cd, usdhi6_cd, 0, |
| dev_name(dev), host); |
| if (ret < 0) |
| goto e_clk_off; |
| } else { |
| mmc->caps |= MMC_CAP_NEEDS_POLL; |
| } |
| |
| ret = devm_request_threaded_irq(dev, irq_sd, usdhi6_sd, usdhi6_sd_bh, 0, |
| dev_name(dev), host); |
| if (ret < 0) |
| goto e_clk_off; |
| |
| ret = devm_request_irq(dev, irq_sdio, usdhi6_sdio, 0, |
| dev_name(dev), host); |
| if (ret < 0) |
| goto e_clk_off; |
| |
| INIT_DELAYED_WORK(&host->timeout_work, usdhi6_timeout_work); |
| |
| usdhi6_dma_request(host, res->start); |
| |
| mmc->ops = &usdhi6_ops; |
| mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | |
| MMC_CAP_SDIO_IRQ; |
| /* Set .max_segs to some random number. Feel free to adjust. */ |
| mmc->max_segs = 32; |
| mmc->max_blk_size = 512; |
| mmc->max_req_size = PAGE_SIZE * mmc->max_segs; |
| mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size; |
| /* |
| * Setting .max_seg_size to 1 page would simplify our page-mapping code, |
| * But OTOH, having large segments makes DMA more efficient. We could |
| * check, whether we managed to get DMA and fall back to 1 page |
| * segments, but if we do manage to obtain DMA and then it fails at |
| * run-time and we fall back to PIO, we will continue getting large |
| * segments. So, we wouldn't be able to get rid of the code anyway. |
| */ |
| mmc->max_seg_size = mmc->max_req_size; |
| if (!mmc->f_max) |
| mmc->f_max = host->imclk; |
| mmc->f_min = host->imclk / 512; |
| |
| platform_set_drvdata(pdev, host); |
| |
| ret = mmc_add_host(mmc); |
| if (ret < 0) |
| goto e_clk_off; |
| |
| return 0; |
| |
| e_clk_off: |
| clk_disable_unprepare(host->clk); |
| e_free_mmc: |
| mmc_free_host(mmc); |
| |
| return ret; |
| } |
| |
| static int usdhi6_remove(struct platform_device *pdev) |
| { |
| struct usdhi6_host *host = platform_get_drvdata(pdev); |
| |
| mmc_remove_host(host->mmc); |
| |
| usdhi6_mask_all(host); |
| cancel_delayed_work_sync(&host->timeout_work); |
| usdhi6_dma_release(host); |
| clk_disable_unprepare(host->clk); |
| mmc_free_host(host->mmc); |
| |
| return 0; |
| } |
| |
| static struct platform_driver usdhi6_driver = { |
| .probe = usdhi6_probe, |
| .remove = usdhi6_remove, |
| .driver = { |
| .name = "usdhi6rol0", |
| .of_match_table = usdhi6_of_match, |
| }, |
| }; |
| |
| module_platform_driver(usdhi6_driver); |
| |
| MODULE_DESCRIPTION("Renesas usdhi6rol0 SD/SDIO host driver"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("platform:usdhi6rol0"); |
| MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); |