diff options
Diffstat (limited to 'target/linux/brcm2708/patches-3.18/0058-MMC-added-alternative-MMC-driver.patch')
| -rwxr-xr-x | target/linux/brcm2708/patches-3.18/0058-MMC-added-alternative-MMC-driver.patch | 1712 |
1 files changed, 1712 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-3.18/0058-MMC-added-alternative-MMC-driver.patch b/target/linux/brcm2708/patches-3.18/0058-MMC-added-alternative-MMC-driver.patch new file mode 100755 index 0000000..0f18fde --- /dev/null +++ b/target/linux/brcm2708/patches-3.18/0058-MMC-added-alternative-MMC-driver.patch @@ -0,0 +1,1712 @@ +From 7da0618348811dbb38825457f63e12d3b8ba943f Mon Sep 17 00:00:00 2001 +From: gellert <gellert@raspberrypi.org> +Date: Fri, 15 Aug 2014 16:35:06 +0100 +Subject: [PATCH 058/114] MMC: added alternative MMC driver + +--- + arch/arm/configs/bcmrpi_defconfig | 2 + + arch/arm/mach-bcm2708/bcm2708.c | 31 + + drivers/mmc/host/Kconfig | 40 +- + drivers/mmc/host/Makefile | 1 + + drivers/mmc/host/bcm2835-mmc.c | 1557 +++++++++++++++++++++++++++++++++++++ + 5 files changed, 1620 insertions(+), 11 deletions(-) + create mode 100644 drivers/mmc/host/bcm2835-mmc.c + +diff --git a/arch/arm/configs/bcmrpi_defconfig b/arch/arm/configs/bcmrpi_defconfig +index f15a4b9..c363a10 100644 +--- a/arch/arm/configs/bcmrpi_defconfig ++++ b/arch/arm/configs/bcmrpi_defconfig +@@ -908,6 +908,8 @@ CONFIG_MMC=y + CONFIG_MMC_BLOCK_MINORS=32 + CONFIG_MMC_SDHCI=y + CONFIG_MMC_SDHCI_PLTFM=y ++CONFIG_MMC_BCM2835=y ++CONFIG_MMC_BCM2835_DMA=y + CONFIG_MMC_SPI=m + CONFIG_LEDS_CLASS=y + CONFIG_LEDS_GPIO=y +diff --git a/arch/arm/mach-bcm2708/bcm2708.c b/arch/arm/mach-bcm2708/bcm2708.c +index b45f327..5ff1299 100644 +--- a/arch/arm/mach-bcm2708/bcm2708.c ++++ b/arch/arm/mach-bcm2708/bcm2708.c +@@ -414,6 +414,34 @@ static struct platform_device bcm2708_systemtimer_device = { + }, + }; + ++#ifdef CONFIG_MMC_BCM2835 /* Arasan emmc SD (new) */ ++static struct resource bcm2835_emmc_resources[] = { ++ [0] = { ++ .start = EMMC_BASE, ++ .end = EMMC_BASE + SZ_256 - 1, /* we only need this area */ ++ /* the memory map actually makes SZ_4K available */ ++ .flags = IORESOURCE_MEM, ++ }, ++ [1] = { ++ .start = IRQ_ARASANSDIO, ++ .end = IRQ_ARASANSDIO, ++ .flags = IORESOURCE_IRQ, ++ }, ++}; ++ ++static u64 bcm2835_emmc_dmamask = 0xffffffffUL; ++ ++struct platform_device bcm2835_emmc_device = { ++ .name = "mmc-bcm2835", ++ .id = 0, ++ .num_resources = ARRAY_SIZE(bcm2835_emmc_resources), ++ .resource = bcm2835_emmc_resources, ++ .dev = { ++ .dma_mask = &bcm2835_emmc_dmamask, ++ .coherent_dma_mask = 0xffffffffUL}, ++}; ++#endif /* CONFIG_MMC_BCM2835 */ ++ + static struct resource bcm2708_powerman_resources[] = { + [0] = { + .start = PM_BASE, +@@ -794,6 +822,9 @@ void __init bcm2708_init(void) + bcm_register_device(&bcm2708_uart1_device); + bcm_register_device(&bcm2708_powerman_device); + ++#ifdef CONFIG_MMC_BCM2835 ++ bcm_register_device(&bcm2835_emmc_device); ++#endif + bcm2708_init_led(); + for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++) + bcm_register_device(&bcm2708_alsa_devices[i]); +diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig +index 1386065..977aeef 100644 +--- a/drivers/mmc/host/Kconfig ++++ b/drivers/mmc/host/Kconfig +@@ -281,17 +281,6 @@ config MMC_SDHCI_BCM_KONA + + If you have a controller with this interface, say Y or M here. + +-config MMC_SDHCI_BCM2835 +- tristate "SDHCI platform support for the BCM2835 SD/MMC Controller" +- depends on ARCH_BCM2835 +- depends on MMC_SDHCI_PLTFM +- select MMC_SDHCI_IO_ACCESSORS +- help +- This selects the BCM2835 SD/MMC controller. If you have a BCM2835 +- platform with SD or MMC devices, say Y or M here. +- +- If unsure, say N. +- + config MMC_MOXART + tristate "MOXART SD/MMC Host Controller support" + depends on ARCH_MOXART && MMC +@@ -313,6 +302,35 @@ config MMC_SDHCI_ST + If you have a controller with this interface, say Y or M here. + If unsure, say N. + ++config MMC_BCM2835 ++ tristate "MMC support on BCM2835" ++ depends on MACH_BCM2708 ++ help ++ This selects the MMC Interface on BCM2835. ++ ++ If you have a controller with this interface, say Y or M here. ++ ++ If unsure, say N. ++ ++config MMC_BCM2835_DMA ++ bool "DMA support on BCM2835 Arasan controller" ++ depends on MMC_BCM2835 ++ help ++ Enable DMA support on the Arasan SDHCI controller in Broadcom 2708 ++ based chips. ++ ++ If unsure, say N. ++ ++config MMC_BCM2835_PIO_DMA_BARRIER ++ int "Block count limit for PIO transfers" ++ depends on MMC_BCM2835 && MMC_BCM2835_DMA ++ range 0 256 ++ default 2 ++ help ++ The inclusive limit in bytes under which PIO will be used instead of DMA ++ ++ If unsure, say 2 here. ++ + config MMC_OMAP + tristate "TI OMAP Multimedia Card Interface support" + depends on ARCH_OMAP +diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile +index b09ecfb..7b17387 100644 +--- a/drivers/mmc/host/Makefile ++++ b/drivers/mmc/host/Makefile +@@ -17,6 +17,7 @@ obj-$(CONFIG_MMC_SDHCI_PXAV2) += sdhci-pxav2.o + obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o + obj-$(CONFIG_MMC_SDHCI_SIRF) += sdhci-sirf.o + obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o ++obj-$(CONFIG_MMC_BCM2835) += bcm2835-mmc.o + obj-$(CONFIG_MMC_WBSD) += wbsd.o + obj-$(CONFIG_MMC_AU1X) += au1xmmc.o + obj-$(CONFIG_MMC_OMAP) += omap.o +diff --git a/drivers/mmc/host/bcm2835-mmc.c b/drivers/mmc/host/bcm2835-mmc.c +new file mode 100644 +index 0000000..cefba7c +--- /dev/null ++++ b/drivers/mmc/host/bcm2835-mmc.c +@@ -0,0 +1,1557 @@ ++/* ++ * BCM2835 MMC host driver. ++ * ++ * Author: Gellert Weisz <gellert@raspberrypi.org> ++ * Copyright 2014 ++ * ++ * Based on ++ * sdhci-bcm2708.c by Broadcom ++ * sdhci-bcm2835.c by Stephen Warren and Oleksandr Tymoshenko ++ * sdhci.c and sdhci-pci.c by Pierre Ossman ++ * ++ * This program is free software; you can redistribute it and/or modify it ++ * under the terms and conditions of the GNU General Public License, ++ * version 2, as published by the Free Software Foundation. ++ * ++ * This program is distributed in the hope it will be useful, but WITHOUT ++ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or ++ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for ++ * more details. ++ * ++ * You should have received a copy of the GNU General Public License ++ * along with this program. If not, see <http://www.gnu.org/licenses/>. ++ */ ++ ++#include <linux/delay.h> ++#include <linux/module.h> ++#include <linux/io.h> ++#include <linux/mmc/mmc.h> ++#include <linux/mmc/host.h> ++#include <linux/mmc/sd.h> ++#include <linux/scatterlist.h> ++#include <linux/of_address.h> ++#include <linux/of_irq.h> ++#include <linux/clk.h> ++#include <linux/platform_device.h> ++#include <linux/err.h> ++#include <linux/blkdev.h> ++#include <linux/dmaengine.h> ++#include <linux/dma-mapping.h> ++#include <linux/of_dma.h> ++ ++#include "sdhci.h" ++ ++ ++#ifndef CONFIG_OF ++ #define BCM2835_CLOCK_FREQ 250000000 ++#endif ++ ++#define DRIVER_NAME "mmc-bcm2835" ++ ++#define DBG(f, x...) \ ++pr_debug(DRIVER_NAME " [%s()]: " f, __func__, ## x) ++ ++#ifndef CONFIG_MMC_BCM2835_DMA ++ #define FORCE_PIO ++#endif ++ ++ ++/* the inclusive limit in bytes under which PIO will be used instead of DMA */ ++#ifdef CONFIG_MMC_BCM2835_PIO_DMA_BARRIER ++#define PIO_DMA_BARRIER CONFIG_MMC_BCM2835_PIO_DMA_BARRIER ++#else ++#define PIO_DMA_BARRIER 00 ++#endif ++ ++#define MIN_FREQ 400000 ++#define TIMEOUT_VAL 0xE ++#define BCM2835_SDHCI_WRITE_DELAY(f) (((2 * 1000000) / f) + 1) ++ ++#ifndef BCM2708_PERI_BASE ++ #define BCM2708_PERI_BASE 0x20000000 ++#endif ++ ++/* FIXME: Needs IOMMU support */ ++#define BCM2835_VCMMU_SHIFT (0x7E000000 - BCM2708_PERI_BASE) ++ ++ ++struct bcm2835_host { ++ spinlock_t lock; ++ ++ void __iomem *ioaddr; ++ u32 phys_addr; ++ ++ struct mmc_host *mmc; ++ ++ u32 timeout; ++ ++ int clock; /* Current clock speed */ ++ u8 pwr; /* Current voltage */ ++ ++ unsigned int max_clk; /* Max possible freq */ ++ unsigned int timeout_clk; /* Timeout freq (KHz) */ ++ unsigned int clk_mul; /* Clock Muliplier value */ ++ ++ struct tasklet_struct finish_tasklet; /* Tasklet structures */ ++ ++ struct timer_list timer; /* Timer for timeouts */ ++ ++ struct sg_mapping_iter sg_miter; /* SG state for PIO */ ++ unsigned int blocks; /* remaining PIO blocks */ ++ ++ int irq; /* Device IRQ */ ++ ++ ++ u32 ier; /* cached registers */ ++ ++ struct mmc_request *mrq; /* Current request */ ++ struct mmc_command *cmd; /* Current command */ ++ struct mmc_data *data; /* Current data request */ ++ unsigned int data_early:1; /* Data finished before cmd */ ++ ++ wait_queue_head_t buf_ready_int; /* Waitqueue for Buffer Read Ready interrupt */ ++ ++ u32 thread_isr; ++ ++ u32 shadow; ++ ++ /*DMA part*/ ++ struct dma_chan *dma_chan_rx; /* DMA channel for reads */ ++ struct dma_chan *dma_chan_tx; /* DMA channel for writes */ ++ struct dma_async_tx_descriptor *tx_desc; /* descriptor */ ++ ++ bool have_dma; ++ bool use_dma; ++ /*end of DMA part*/ ++ ++ int max_delay; /* maximum length of time spent waiting */ ++ ++ int flags; /* Host attributes */ ++#define SDHCI_USE_SDMA (1<<0) /* Host is SDMA capable */ ++#define SDHCI_USE_ADMA (1<<1) /* Host is ADMA capable */ ++#define SDHCI_REQ_USE_DMA (1<<2) /* Use DMA for this req. */ ++#define SDHCI_DEVICE_DEAD (1<<3) /* Device unresponsive */ ++#define SDHCI_AUTO_CMD12 (1<<6) /* Auto CMD12 support */ ++#define SDHCI_AUTO_CMD23 (1<<7) /* Auto CMD23 support */ ++#define SDHCI_PV_ENABLED (1<<8) /* Preset value enabled */ ++#define SDHCI_SDIO_IRQ_ENABLED (1<<9) /* SDIO irq enabled */ ++#define SDHCI_USE_PLATDMA (1<<12) /* Host uses 3rd party DMA */ ++}; ++ ++ ++static inline void bcm2835_mmc_writel(struct bcm2835_host *host, u32 val, int reg) ++{ ++ writel(val, host->ioaddr + reg); ++ udelay(BCM2835_SDHCI_WRITE_DELAY(max(host->clock, MIN_FREQ))); ++} ++ ++static inline void mmc_raw_writel(struct bcm2835_host *host, u32 val, int reg) ++{ ++ writel(val, host->ioaddr + reg); ++} ++ ++static inline u32 bcm2835_mmc_readl(struct bcm2835_host *host, int reg) ++{ ++ return readl(host->ioaddr + reg); ++} ++ ++static inline void bcm2835_mmc_writew(struct bcm2835_host *host, u16 val, int reg) ++{ ++ u32 oldval = (reg == SDHCI_COMMAND) ? host->shadow : ++ bcm2835_mmc_readl(host, reg & ~3); ++ u32 word_num = (reg >> 1) & 1; ++ u32 word_shift = word_num * 16; ++ u32 mask = 0xffff << word_shift; ++ u32 newval = (oldval & ~mask) | (val << word_shift); ++ ++ if (reg == SDHCI_TRANSFER_MODE) ++ host->shadow = newval; ++ else ++ bcm2835_mmc_writel(host, newval, reg & ~3); ++ ++} ++ ++static inline void bcm2835_mmc_writeb(struct bcm2835_host *host, u8 val, int reg) ++{ ++ u32 oldval = bcm2835_mmc_readl(host, reg & ~3); ++ u32 byte_num = reg & 3; ++ u32 byte_shift = byte_num * 8; ++ u32 mask = 0xff << byte_shift; ++ u32 newval = (oldval & ~mask) | (val << byte_shift); ++ ++ bcm2835_mmc_writel(host, newval, reg & ~3); ++} ++ ++ ++static inline u16 bcm2835_mmc_readw(struct bcm2835_host *host, int reg) ++{ ++ u32 val = bcm2835_mmc_readl(host, (reg & ~3)); ++ u32 word_num = (reg >> 1) & 1; ++ u32 word_shift = word_num * 16; ++ u32 word = (val >> word_shift) & 0xffff; ++ ++ return word; ++} ++ ++static inline u8 bcm2835_mmc_readb(struct bcm2835_host *host, int reg) ++{ ++ u32 val = bcm2835_mmc_readl(host, (reg & ~3)); ++ u32 byte_num = reg & 3; ++ u32 byte_shift = byte_num * 8; ++ u32 byte = (val >> byte_shift) & 0xff; ++ ++ return byte; ++} ++ ++static void bcm2835_mmc_unsignal_irqs(struct bcm2835_host *host, u32 clear) ++{ ++ u32 ier; ++ ++ ier = bcm2835_mmc_readl(host, SDHCI_SIGNAL_ENABLE); ++ ier &= ~clear; ++ /* change which requests generate IRQs - makes no difference to ++ the content of SDHCI_INT_STATUS, or the need to acknowledge IRQs */ ++ bcm2835_mmc_writel(host, ier, SDHCI_SIGNAL_ENABLE); ++} ++ ++ ++static void bcm2835_mmc_dumpregs(struct bcm2835_host *host) ++{ ++ pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n", ++ mmc_hostname(host->mmc)); ++ ++ pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n", ++ bcm2835_mmc_readl(host, SDHCI_DMA_ADDRESS), ++ bcm2835_mmc_readw(host, SDHCI_HOST_VERSION)); ++ pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n", ++ bcm2835_mmc_readw(host, SDHCI_BLOCK_SIZE), ++ bcm2835_mmc_readw(host, SDHCI_BLOCK_COUNT)); ++ pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n", ++ bcm2835_mmc_readl(host, SDHCI_ARGUMENT), ++ bcm2835_mmc_readw(host, SDHCI_TRANSFER_MODE)); ++ pr_debug(DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n", ++ bcm2835_mmc_readl(host, SDHCI_PRESENT_STATE), ++ bcm2835_mmc_readb(host, SDHCI_HOST_CONTROL)); ++ pr_debug(DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n", ++ bcm2835_mmc_readb(host, SDHCI_POWER_CONTROL), ++ bcm2835_mmc_readb(host, SDHCI_BLOCK_GAP_CONTROL)); ++ pr_debug(DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n", ++ bcm2835_mmc_readb(host, SDHCI_WAKE_UP_CONTROL), ++ bcm2835_mmc_readw(host, SDHCI_CLOCK_CONTROL)); ++ pr_debug(DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n", ++ bcm2835_mmc_readb(host, SDHCI_TIMEOUT_CONTROL), ++ bcm2835_mmc_readl(host, SDHCI_INT_STATUS)); ++ pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n", ++ bcm2835_mmc_readl(host, SDHCI_INT_ENABLE), ++ bcm2835_mmc_readl(host, SDHCI_SIGNAL_ENABLE)); ++ pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n", ++ bcm2835_mmc_readw(host, SDHCI_ACMD12_ERR), ++ bcm2835_mmc_readw(host, SDHCI_SLOT_INT_STATUS)); ++ pr_debug(DRIVER_NAME ": Caps: 0x%08x | Caps_1: 0x%08x\n", ++ bcm2835_mmc_readl(host, SDHCI_CAPABILITIES), ++ bcm2835_mmc_readl(host, SDHCI_CAPABILITIES_1)); ++ pr_debug(DRIVER_NAME ": Cmd: 0x%08x | Max curr: 0x%08x\n", ++ bcm2835_mmc_readw(host, SDHCI_COMMAND), ++ bcm2835_mmc_readl(host, SDHCI_MAX_CURRENT)); ++ pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n", ++ bcm2835_mmc_readw(host, SDHCI_HOST_CONTROL2)); ++ ++ pr_debug(DRIVER_NAME ": ===========================================\n"); ++} ++ ++ ++static void bcm2835_mmc_reset(struct bcm2835_host *host, u8 mask) ++{ ++ unsigned long timeout; ++ ++ bcm2835_mmc_writeb(host, mask, SDHCI_SOFTWARE_RESET); ++ ++ if (mask & SDHCI_RESET_ALL) ++ host->clock = 0; ++ ++ /* Wait max 100 ms */ ++ timeout = 100; ++ ++ /* hw clears the bit when it's done */ ++ while (bcm2835_mmc_readb(host, SDHCI_SOFTWARE_RESET) & mask) { ++ if (timeout == 0) { ++ pr_err("%s: Reset 0x%x never completed.\n", ++ mmc_hostname(host->mmc), (int)mask); ++ bcm2835_mmc_dumpregs(host); ++ return; ++ } ++ timeout--; ++ mdelay(1); ++ } ++ ++ if (100-timeout > 10 && 100-timeout > host->max_delay) { ++ host->max_delay = 100-timeout; ++ pr_warning("Warning: MMC controller hung for %d ms\n", host->max_delay); ++ } ++} ++ ++static void bcm2835_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios); ++ ++static void bcm2835_mmc_init(struct bcm2835_host *host, int soft) ++{ ++ if (soft) ++ bcm2835_mmc_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA); ++ else ++ bcm2835_mmc_reset(host, SDHCI_RESET_ALL); ++ ++ host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT | ++ SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | ++ SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC | ++ SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END | ++ SDHCI_INT_RESPONSE; ++ ++ bcm2835_mmc_writel(host, host->ier, SDHCI_INT_ENABLE); ++ bcm2835_mmc_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); ++ ++ if (soft) { ++ /* force clock reconfiguration */ ++ host->clock = 0; ++ bcm2835_mmc_set_ios(host->mmc, &host->mmc->ios); ++ } ++} ++ ++ ++ ++static void bcm2835_mmc_finish_data(struct bcm2835_host *host); ++ ++static void bcm2835_mmc_dma_complete(void *param) ++{ ++ struct bcm2835_host *host = param; ++ struct dma_chan *dma_chan; ++ unsigned long flags; ++ u32 dir_data; ++ ++ spin_lock_irqsave(&host->lock, flags); ++ ++ if (host->data && !(host->data->flags & MMC_DATA_WRITE)) { ++ /* otherwise handled in SDHCI IRQ */ ++ dma_chan = host->dma_chan_rx; ++ dir_data = DMA_FROM_DEVICE; ++ ++ dma_unmap_sg(dma_chan->device->dev, ++ host->data->sg, host->data->sg_len, ++ dir_data); ++ ++ bcm2835_mmc_finish_data(host); ++ } ++ ++ spin_unlock_irqrestore(&host->lock, flags); ++} ++ ++static void bcm2835_bcm2835_mmc_read_block_pio(struct bcm2835_host *host) ++{ ++ unsigned long flags; ++ size_t blksize, len, chunk; ++ ++ u32 uninitialized_var(scratch); ++ u8 *buf; ++ ++ blksize = host->data->blksz; ++ chunk = 0; ++ ++ local_irq_save(flags); ++ ++ while (blksize) { ++ if (!sg_miter_next(&host->sg_miter)) ++ BUG(); ++ ++ len = min(host->sg_miter.length, blksize); ++ ++ blksize -= len; ++ host->sg_miter.consumed = len; ++ ++ buf = host->sg_miter.addr; ++ ++ while (len) { ++ if (chunk == 0) { ++ scratch = bcm2835_mmc_readl(host, SDHCI_BUFFER); ++ chunk = 4; ++ } ++ ++ *buf = scratch & 0xFF; ++ ++ buf++; ++ scratch >>= 8; ++ chunk--; ++ len--; ++ } ++ } ++ ++ sg_miter_stop(&host->sg_miter); ++ ++ local_irq_restore(flags); ++} ++ ++static void bcm2835_bcm2835_mmc_write_block_pio(struct bcm2835_host *host) ++{ ++ unsigned long flags; ++ size_t blksize, len, chunk; ++ u32 scratch; ++ u8 *buf; ++ ++ blksize = host->data->blksz; ++ chunk = 0; ++ chunk = 0; ++ scratch = 0; ++ ++ local_irq_save(flags); ++ ++ while (blksize) { ++ if (!sg_miter_next(&host->sg_miter)) ++ BUG(); ++ ++ len = min(host->sg_miter.length, blksize); ++ ++ blksize -= len; ++ host->sg_miter.consumed = len; ++ ++ buf = host->sg_miter.addr; ++ ++ while (len) { ++ scratch |= (u32)*buf << (chunk * 8); ++ ++ buf++; ++ chunk++; ++ len--; ++ ++ if ((chunk == 4) || ((len == 0) && (blksize == 0))) { ++ mmc_raw_writel(host, scratch, SDHCI_BUFFER); ++ chunk = 0; ++ scratch = 0; ++ } ++ } ++ } ++ ++ sg_miter_stop(&host->sg_miter); ++ ++ local_irq_restore(flags); ++} ++ ++ ++static void bcm2835_mmc_transfer_pio(struct bcm2835_host *host) ++{ ++ u32 mask; ++ ++ BUG_ON(!host->data); ++ ++ if (host->blocks == 0) ++ return; ++ ++ if (host->data->flags & MMC_DATA_READ) ++ mask = SDHCI_DATA_AVAILABLE; ++ else ++ mask = SDHCI_SPACE_AVAILABLE; ++ ++ while (bcm2835_mmc_readl(host, SDHCI_PRESENT_STATE) & mask) { ++ ++ if (host->data->flags & MMC_DATA_READ) ++ bcm2835_bcm2835_mmc_read_block_pio(host); ++ else ++ bcm2835_bcm2835_mmc_write_block_pio(host); ++ ++ host->blocks--; ++ ++ /* QUIRK used in sdhci.c removes the 'if' */ ++ /* but it seems this is unnecessary */ ++ if (host->blocks == 0) ++ break; ++ ++ ++ } ++} ++ ++ ++static void bcm2835_mmc_transfer_dma(struct bcm2835_host *host) ++{ ++ u32 len, dir_data, dir_slave; ++ struct dma_async_tx_descriptor *desc = NULL; ++ struct dma_chan *dma_chan; ++ ++ ++ WARN_ON(!host->data); ++ ++ if (!host->data) ++ return; ++ ++ if (host->blocks == 0) ++ return; ++ ++ if (host->data->flags & MMC_DATA_READ) { ++ dma_chan = host->dma_chan_rx; ++ dir_data = DMA_FROM_DEVICE; ++ dir_slave = DMA_DEV_TO_MEM; ++ } else { ++ dma_chan = host->dma_chan_tx; ++ dir_data = DMA_TO_DEVICE; ++ dir_slave = DMA_MEM_TO_DEV; ++ } ++ ++ BUG_ON(!dma_chan->device); ++ BUG_ON(!dma_chan->device->dev); ++ BUG_ON(!host->data->sg); ++ ++ len = dma_map_sg(dma_chan->device->dev, host->data->sg, ++ host->data->sg_len, dir_data); ++ if (len > 0) { ++ desc = dmaengine_prep_slave_sg(dma_chan, host->data->sg, ++ len, dir_slave, ++ DMA_PREP_INTERRUPT | DMA_CTRL_ACK); ++ } else { ++ dev_err(mmc_dev(host->mmc), "dma_map_sg returned zero length\n"); ++ } ++ if (desc) { ++ bcm2835_mmc_unsignal_irqs(host, SDHCI_INT_DATA_AVAIL | ++ SDHCI_INT_SPACE_AVAIL); ++ host->tx_desc = desc; ++ desc->callback = bcm2835_mmc_dma_complete; ++ desc->callback_param = host; ++ dmaengine_submit(desc); ++ dma_async_issue_pending(dma_chan); ++ } ++ ++} ++ ++ ++ ++static void bcm2835_mmc_set_transfer_irqs(struct bcm2835_host *host) ++{ ++ u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL; ++ u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR; ++ ++ if (host->use_dma) ++ host->ier = (host->ier & ~pio_irqs) | dma_irqs; ++ else ++ host->ier = (host->ier & ~dma_irqs) | pio_irqs; ++ ++ bcm2835_mmc_writel(host, host->ier, SDHCI_INT_ENABLE); ++ bcm2835_mmc_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); ++} ++ ++ ++static void bcm2835_mmc_prepare_data(struct bcm2835_host *host, struct mmc_command *cmd) ++{ ++ u8 count; ++ struct mmc_data *data = cmd->data; ++ ++ WARN_ON(host->data); ++ ++ if (data || (cmd->flags & MMC_RSP_BUSY)) { ++ count = TIMEOUT_VAL; ++ bcm2835_mmc_writeb(host, count, SDHCI_TIMEOUT_CONTROL); ++ } ++ ++ if (!data) ++ return; ++ ++ /* Sanity checks */ ++ BUG_ON(data->blksz * data->blocks > 524288); ++ BUG_ON(data->blksz > host->mmc->max_blk_size); ++ BUG_ON(data->blocks > 65535); ++ ++ host->data = data; ++ host->data_early = 0; ++ host->data->bytes_xfered = 0; ++ ++ ++ if (!(host->flags & SDHCI_REQ_USE_DMA)) { ++ int flags; ++ ++ flags = SG_MITER_ATOMIC; ++ if (host->data->flags & MMC_DATA_READ) ++ flags |= SG_MITER_TO_SG; ++ else ++ flags |= SG_MITER_FROM_SG; ++ sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); ++ host->blocks = data->blocks; ++ } ++ ++ host->use_dma = host->have_dma && data->blocks > PIO_DMA_BARRIER; ++ ++ bcm2835_mmc_set_transfer_irqs(host); ++ ++ /* Set the DMA boundary value and block size */ ++ bcm2835_mmc_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG, ++ data->blksz), SDHCI_BLOCK_SIZE); ++ bcm2835_mmc_writew(host, data->blocks, SDHCI_BLOCK_COUNT); ++ ++ BUG_ON(!host->data); ++} ++ ++static void bcm2835_mmc_set_transfer_mode(struct bcm2835_host *host, ++ struct mmc_command *cmd) ++{ ++ u16 mode; ++ struct mmc_data *data = cmd->data; ++ ++ if (data == NULL) { ++ /* clear Auto CMD settings for no data CMDs */ ++ mode = bcm2835_mmc_readw(host, SDHCI_TRANSFER_MODE); ++ bcm2835_mmc_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 | ++ SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE); ++ return; ++ } ++ ++ WARN_ON(!host->data); ++ ++ mode = SDHCI_TRNS_BLK_CNT_EN; ++ ++ if ((mmc_op_multi(cmd->opcode) || data->blocks > 1)) { ++ mode |= SDHCI_TRNS_MULTI; ++ ++ /* ++ * If we are sending CMD23, CMD12 never gets sent ++ * on successful completion (so no Auto-CMD12). ++ */ ++ if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) ++ mode |= SDHCI_TRNS_AUTO_CMD12; ++ else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) { ++ mode |= SDHCI_TRNS_AUTO_CMD23; ++ bcm2835_mmc_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2); ++ } ++ } ++ ++ if (data->flags & MMC_DATA_READ) ++ mode |= SDHCI_TRNS_READ; ++ if (host->flags & SDHCI_REQ_USE_DMA) ++ mode |= SDHCI_TRNS_DMA; ++ ++ bcm2835_mmc_writew(host, mode, SDHCI_TRANSFER_MODE); ++} ++ ++void bcm2835_mmc_send_command(struct bcm2835_host *host, struct mmc_command *cmd) ++{ ++ int flags; ++ u32 mask; ++ unsigned long timeout; ++ ++ WARN_ON(host->cmd); ++ ++ /* Wait max 10 ms */ ++ timeout = 1000; ++ ++ mask = SDHCI_CMD_INHIBIT; ++ if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY)) ++ mask |= SDHCI_DATA_INHIBIT; ++ ++ /* We shouldn't wait for data inihibit for stop commands, even ++ though they might use busy signaling */ ++ if (host->mrq->data && (cmd == host->mrq->data->stop)) ++ mask &= ~SDHCI_DATA_INHIBIT; ++ ++ while (bcm2835_mmc_readl(host, SDHCI_PRESENT_STATE) & mask) { ++ if (timeout == 0) { ++ pr_err("%s: Controller never released inhibit bit(s).\n", ++ mmc_hostname(host->mmc)); ++ bcm2835_mmc_dumpregs(host); ++ cmd->error = -EIO; ++ tasklet_schedule(&host->finish_tasklet); ++ return; ++ } ++ timeout--; ++ udelay(10); ++ } ++ ++ if ((1000-timeout)/100 > 1 && (1000-timeout)/100 > host->max_delay) { ++ host->max_delay = (1000-timeout)/100; ++ pr_warning("Warning: MMC controller hung for %d ms\n", host->max_delay); ++ } ++ ++ timeout = jiffies; ++#ifdef CONFIG_OF ++ if (!cmd->data && cmd->busy_timeout > 9000) ++ timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ; ++ else ++#endif ++ timeout += 10 * HZ; ++ mod_timer(&host->timer, timeout); ++ ++ host->cmd = cmd; ++ ++ bcm2835_mmc_prepare_data(host, cmd); ++ ++ bcm2835_mmc_writel(host, cmd->arg, SDHCI_ARGUMENT); ++ ++ bcm2835_mmc_set_transfer_mode(host, cmd); ++ ++ if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) { ++ pr_err("%s: Unsupported response type!\n", ++ mmc_hostname(host->mmc)); ++ cmd->error = -EINVAL; ++ tasklet_schedule(&host->finish_tasklet); ++ return; ++ } ++ ++ if (!(cmd->flags & MMC_RSP_PRESENT)) ++ flags = SDHCI_CMD_RESP_NONE; ++ else if (cmd->flags & MMC_RSP_136) ++ flags = SDHCI_CMD_RESP_LONG; ++ else if (cmd->flags & MMC_RSP_BUSY) ++ flags = SDHCI_CMD_RESP_SHORT_BUSY; ++ else ++ flags = SDHCI_CMD_RESP_SHORT; ++ ++ if (cmd->flags & MMC_RSP_CRC) ++ flags |= SDHCI_CMD_CRC; ++ if (cmd->flags & MMC_RSP_OPCODE) ++ flags |= SDHCI_CMD_INDEX; ++ ++ if (cmd->data) ++ flags |= SDHCI_CMD_DATA; ++ ++ bcm2835_mmc_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND); ++} ++ ++ ++static void bcm2835_mmc_finish_data(struct bcm2835_host *host) ++{ ++ struct mmc_data *data; ++ ++ BUG_ON(!host->data); ++ ++ data = host->data; ++ host->data = NULL; ++ ++ if (data->error) ++ data->bytes_xfered = 0; ++ else ++ data->bytes_xfered = data->blksz * data->blocks; ++ ++ /* ++ * Need to send CMD12 if - ++ * a) open-ended multiblock transfer (no CMD23) ++ * b) error in multiblock transfer ++ */ ++ if (data->stop && ++ (data->error || ++ !host->mrq->sbc)) { ++ ++ /* ++ * The controller needs a reset of internal state machines ++ * upon error conditions. ++ */ ++ if (data->error) { ++ bcm2835_mmc_reset(host, SDHCI_RESET_CMD); ++ bcm2835_mmc_reset(host, SDHCI_RESET_DATA); ++ } ++ ++ bcm2835_mmc_send_command(host, data->stop); ++ } else ++ tasklet_schedule(&host->finish_tasklet); ++} ++ ++static void bcm2835_mmc_finish_command(struct bcm2835_host *host) ++{ ++ int i; ++ ++ BUG_ON(host->cmd == NULL); ++ ++ if (host->cmd->flags & MMC_RSP_PRESENT) { ++ if (host->cmd->flags & MMC_RSP_136) { ++ /* CRC is stripped so we need to do some shifting. */ ++ for (i = 0; i < 4; i++) { ++ host->cmd->resp[i] = bcm2835_mmc_readl(host, ++ SDHCI_RESPONSE + (3-i)*4) << 8; ++ if (i != 3) ++ host->cmd->resp[i] |= ++ bcm2835_mmc_readb(host, ++ SDHCI_RESPONSE + (3-i)*4-1); ++ } ++ } else { ++ host->cmd->resp[0] = bcm2835_mmc_readl(host, SDHCI_RESPONSE); ++ } ++ } ++ ++ host->cmd->error = 0; ++ ++ /* Finished CMD23, now send actual command. */ ++ if (host->cmd == host->mrq->sbc) { ++ host->cmd = NULL; ++ bcm2835_mmc_send_command(host, host->mrq->cmd); ++ ++ if (host->mrq->cmd->data && host->use_dma) { ++ /* DMA transfer starts now, PIO starts after interrupt */ ++ bcm2835_mmc_transfer_dma(host); ++ } ++ } else { ++ ++ /* Processed actual command. */ ++ if (host->data && host->data_early) ++ bcm2835_mmc_finish_data(host); ++ ++ if (!host->cmd->data) ++ tasklet_schedule(&host->finish_tasklet); ++ ++ host->cmd = NULL; ++ } ++} ++ ++ ++static void bcm2835_mmc_timeout_timer(unsigned long data) ++{ ++ struct bcm2835_host *host; ++ unsigned long flags; ++ ++ host = (struct bcm2835_host *)data; ++ ++ spin_lock_irqsave(&host->lock, flags); ++ ++ if (host->mrq) { ++ pr_err("%s: Timeout waiting for hardware interrupt.\n", ++ mmc_hostname(host->mmc)); ++ bcm2835_mmc_dumpregs(host); ++ ++ if (host->data) { ++ host->data->error = -ETIMEDOUT; ++ bcm2835_mmc_finish_data(host); ++ } else { ++ if (host->cmd) ++ host->cmd->error = -ETIMEDOUT; ++ else ++ host->mrq->cmd->error = -ETIMEDOUT; ++ ++ tasklet_schedule(&host->finish_tasklet); ++ } ++ } ++ ++ mmiowb(); ++ spin_unlock_irqrestore(&host->lock, flags); ++} ++ ++ ++static void bcm2835_mmc_enable_sdio_irq_nolock(struct bcm2835_host *host, int enable) ++{ ++ if (!(host->flags & SDHCI_DEVICE_DEAD)) { ++ if (enable) ++ host->ier |= SDHCI_INT_CARD_INT; ++ else ++ host->ier &= ~SDHCI_INT_CARD_INT; ++ ++ bcm2835_mmc_writel(host, host->ier, SDHCI_INT_ENABLE); ++ bcm2835_mmc_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); ++ mmiowb(); ++ } ++} ++ ++static void bcm2835_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) ++{ ++ struct bcm2835_host *host = mmc_priv(mmc); ++ unsigned long flags; ++ ++ spin_lock_irqsave(&host->lock, flags); ++ if (enable) ++ host->flags |= SDHCI_SDIO_IRQ_ENABLED; ++ else ++ host->flags &= ~SDHCI_SDIO_IRQ_ENABLED; ++ ++ bcm2835_mmc_enable_sdio_irq_nolock(host, enable); ++ spin_unlock_irqrestore(&host->lock, flags); ++} ++ ++static void bcm2835_mmc_cmd_irq(struct bcm2835_host *host, u32 intmask) ++{ ++ ++ BUG_ON(intmask == 0); ++ ++ if (!host->cmd) { ++ pr_err("%s: Got command interrupt 0x%08x even " ++ "though no command operation was in progress.\n", ++ mmc_hostname(host->mmc), (unsigned)intmask); ++ bcm2835_mmc_dumpregs(host); ++ return; ++ } ++ ++ if (intmask & SDHCI_INT_TIMEOUT) ++ host->cmd->error = -ETIMEDOUT; ++ else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT | ++ SDHCI_INT_INDEX)) { ++ host->cmd->error = -EILSEQ; ++ } ++ ++ if (host->cmd->error) { ++ tasklet_schedule(&host->finish_tasklet); ++ return; ++ } ++ ++ if (intmask & SDHCI_INT_RESPONSE) ++ bcm2835_mmc_finish_command(host); ++ ++} ++ ++static void bcm2835_mmc_data_irq(struct bcm2835_host *host, u32 intmask) ++{ ++ struct dma_chan *dma_chan; ++ u32 dir_data; ++ ++ BUG_ON(intmask == 0); ++ ++ if (!host->data) { ++ /* ++ * The "data complete" interrupt is also used to ++ * indicate that a busy state has ended. See comment ++ * above in sdhci_cmd_irq(). ++ */ ++ if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) { ++ if (intmask & SDHCI_INT_DATA_END) { ++ bcm2835_mmc_finish_command(host); ++ return; ++ } ++ } ++ ++ pr_debug("%s: Got data interrupt 0x%08x even " ++ "though no data operation was in progress.\n", ++ mmc_hostname(host->mmc), (unsigned)intmask); ++ bcm2835_mmc_dumpregs(host); ++ ++ return; ++ } ++ ++ if (intmask & SDHCI_INT_DATA_TIMEOUT) ++ host->data->error = -ETIMEDOUT; ++ else if (intmask & SDHCI_INT_DATA_END_BIT) ++ host->data->error = -EILSEQ; ++ else if ((intmask & SDHCI_INT_DATA_CRC) && ++ SDHCI_GET_CMD(bcm2835_mmc_readw(host, SDHCI_COMMAND)) ++ != MMC_BUS_TEST_R) ++ host->data->error = -EILSEQ; ++ ++ if (host->use_dma) { ++ if (host->data->flags & MMC_DATA_WRITE) { ++ /* IRQ handled here */ ++ ++ dma_chan = host->dma_chan_tx; ++ dir_data = DMA_TO_DEVICE; ++ dma_unmap_sg(dma_chan->device->dev, ++ host->data->sg, host->data->sg_len, ++ dir_data); ++ ++ bcm2835_mmc_finish_data(host); ++ } ++ ++ } else { ++ if (host->data->error) ++ bcm2835_mmc_finish_data(host); ++ else { ++ if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL)) ++ bcm2835_mmc_transfer_pio(host); ++ ++ if (intmask & SDHCI_INT_DATA_END) { ++ if (host->cmd) { ++ /* ++ * Data managed to finish before the ++ * command completed. Make sure we do ++ * things in the proper order. ++ */ ++ host->data_early = 1; ++ } else { ++ bcm2835_mmc_finish_data(host); ++ } ++ } ++ } ++ } ++} ++ ++ ++static irqreturn_t bcm2835_mmc_irq(int irq, void *dev_id) ++{ ++ irqreturn_t result = IRQ_NONE; ++ struct bcm2835_host *host = dev_id; ++ u32 intmask, mask, unexpected = 0; ++ int max_loops = 16; ++#ifndef CONFIG_OF ++ int cardint = 0; ++#endif ++ ++ spin_lock(&host->lock); ++ ++ intmask = bcm2835_mmc_readl(host, SDHCI_INT_STATUS); ++ ++ if (!intmask || intmask == 0xffffffff) { ++ result = IRQ_NONE; ++ goto out; ++ } ++ ++ do { ++ /* Clear selected interrupts. */ ++ mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK | ++ SDHCI_INT_BUS_POWER); ++ bcm2835_mmc_writel(host, mask, SDHCI_INT_STATUS); ++ ++ ++ if (intmask & SDHCI_INT_CMD_MASK) ++ bcm2835_mmc_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK); ++ ++ if (intmask & SDHCI_INT_DATA_MASK) ++ bcm2835_mmc_data_irq(host, intmask & SDHCI_INT_DATA_MASK); ++ ++ if (intmask & SDHCI_INT_BUS_POWER) ++ pr_err("%s: Card is consuming too much power!\n", ++ mmc_hostname(host->mmc)); ++ ++ if (intmask & SDHCI_INT_CARD_INT) { ++#ifndef CONFIG_OF ++ cardint = 1; ++#else ++ bcm2835_mmc_enable_sdio_irq_nolock(host, false); ++ host->thread_isr |= SDHCI_INT_CARD_INT; ++ result = IRQ_WAKE_THREAD; ++#endif ++ } ++ ++ intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE | ++ SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK | ++ SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER | ++ SDHCI_INT_CARD_INT); ++ ++ if (intmask) { ++ unexpected |= intmask; ++ bcm2835_mmc_writel(host, intmask, SDHCI_INT_STATUS); ++ } ++ ++ if (result == IRQ_NONE) ++ result = IRQ_HANDLED; ++ ++ intmask = bcm2835_mmc_readl(host, SDHCI_INT_STATUS); ++ } while (intmask && --max_loops); ++out: ++ spin_unlock(&host->lock); ++ ++ if (unexpected) { ++ pr_err("%s: Unexpected interrupt 0x%08x.\n", ++ mmc_hostname(host->mmc), unexpected); ++ bcm2835_mmc_dumpregs(host); ++ } ++ ++#ifndef CONFIG_OF ++ if (cardint) ++ mmc_signal_sdio_irq(host->mmc); ++#endif ++ ++ return result; ++} ++ ++#ifdef CONFIG_OF ++static irqreturn_t bcm2835_mmc_thread_irq(int irq, void *dev_id) ++{ ++ struct bcm2835_host *host = dev_id; ++ unsigned long flags; ++ u32 isr; ++ ++ spin_lock_irqsave(&host->lock, flags); ++ isr = host->thread_isr; ++ host->thread_isr = 0; ++ spin_unlock_irqrestore(&host->lock, flags); ++ ++ if (isr & SDHCI_INT_CARD_INT) { ++ sdio_run_irqs(host->mmc); ++ ++ spin_lock_irqsave(&host->lock, flags); ++ if (host->flags & SDHCI_SDIO_IRQ_ENABLED) ++ bcm2835_mmc_enable_sdio_irq_nolock(host, true); ++ spin_unlock_irqrestore(&host->lock, flags); ++ } ++ ++ return isr ? IRQ_HANDLED : IRQ_NONE; ++} ++#endif ++ ++ ++ ++void bcm2835_mmc_set_clock(struct bcm2835_host *host, unsigned int clock) ++{ ++ int div = 0; /* Initialized for compiler warning */ ++ int real_div = div, clk_mul = 1; ++ u16 clk = 0; ++ unsigned long timeout; ++ ++ ++ host->mmc->actual_clock = 0; ++ ++ bcm2835_mmc_writew(host, 0, SDHCI_CLOCK_CONTROL); ++ ++ if (clock == 0) ++ return; ++ ++ /* Version 3.00 divisors must be a multiple of 2. */ ++ if (host->max_clk <= clock) ++ div = 1; ++ else { ++ for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; ++ div += 2) { ++ if ((host->max_clk / div) <= clock) ++ break; ++ } ++ } ++ ++ real_div = div; ++ div >>= 1; ++ ++ if (real_div) ++ host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div; ++ ++ clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT; ++ clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN) ++ << SDHCI_DIVIDER_HI_SHIFT; ++ clk |= SDHCI_CLOCK_INT_EN; ++ bcm2835_mmc_writew(host, clk, SDHCI_CLOCK_CONTROL); ++ ++ /* Wait max 20 ms */ ++ timeout = 20; ++ while (!((clk = bcm2835_mmc_readw(host, SDHCI_CLOCK_CONTROL)) ++ & SDHCI_CLOCK_INT_STABLE)) { ++ if (timeout == 0) { ++ pr_err("%s: Internal clock never " ++ "stabilised.\n", mmc_hostname(host->mmc)); ++ bcm2835_mmc_dumpregs(host); ++ return; ++ } ++ timeout--; ++ mdelay(1); ++ } ++ ++ if (20-timeout > 10 && 20-timeout > host->max_delay) { ++ host->max_delay = 20-timeout; ++ pr_warning("Warning: MMC controller hung for %d ms\n", host->max_delay); ++ } ++ ++ clk |= SDHCI_CLOCK_CARD_EN; ++ bcm2835_mmc_writew(host, clk, SDHCI_CLOCK_CONTROL); ++} ++ ++static void bcm2835_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) ++{ ++ struct bcm2835_host *host; ++ unsigned long flags; ++ ++ host = mmc_priv(mmc); ++ ++ spin_lock_irqsave(&host->lock, flags); ++ ++ WARN_ON(host->mrq != NULL); ++ ++ host->mrq = mrq; ++ ++ if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23)) ++ bcm2835_mmc_send_command(host, mrq->sbc); ++ else ++ bcm2835_mmc_send_command(host, mrq->cmd); ++ ++ mmiowb(); ++ spin_unlock_irqrestore(&host->lock, flags); ++ ++ if (!(mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23)) && mrq->cmd->data && host->use_dma) { ++ /* DMA transfer starts now, PIO starts after interrupt */ ++ bcm2835_mmc_transfer_dma(host); ++ } ++} ++ ++ ++static void bcm2835_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) ++{ ++ ++ struct bcm2835_host *host = mmc_priv(mmc); ++ unsigned long flags; ++ u8 ctrl; ++ u16 clk, ctrl_2; ++ ++ ++ spin_lock_irqsave(&host->lock, flags); ++ ++ if (!ios->clock || ios->clock != host->clock) { ++ bcm2835_mmc_set_clock(host, ios->clock); ++ host->clock = ios->clock; ++ } ++ ++ if (host->pwr != SDHCI_POWER_330) { ++ host->pwr = SDHCI_POWER_330; ++ bcm2835_mmc_writeb(host, SDHCI_POWER_330 | SDHCI_POWER_ON, SDHCI_POWER_CONTROL); ++ } ++ ++ ctrl = bcm2835_mmc_readb(host, SDHCI_HOST_CONTROL); ++ ++ /* set bus width */ ++ ctrl &= ~SDHCI_CTRL_8BITBUS; ++ if (ios->bus_width == MMC_BUS_WIDTH_4) ++ ctrl |= SDHCI_CTRL_4BITBUS; ++ else ++ ctrl &= ~SDHCI_CTRL_4BITBUS; ++ ++ ctrl &= ~SDHCI_CTRL_HISPD; /* NO_HISPD_BIT */ ++ ++ ++ bcm2835_mmc_writeb(host, ctrl, SDHCI_HOST_CONTROL); ++ /* ++ * We only need to set Driver Strength if the ++ * preset value enable is not set. ++ */ ++ ctrl_2 = bcm2835_mmc_readw(host, SDHCI_HOST_CONTROL2); ++ ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK; ++ if (ios->drv_type == MMC_SET_DRIVER_TYPE_A) ++ ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A; ++ else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C) ++ ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C; ++ ++ bcm2835_mmc_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); ++ ++ /* Reset SD Clock Enable */ ++ clk = bcm2835_mmc_readw(host, SDHCI_CLOCK_CONTROL); ++ clk &= ~SDHCI_CLOCK_CARD_EN; ++ bcm2835_mmc_writew(host, clk, SDHCI_CLOCK_CONTROL); ++ ++ /* Re-enable SD Clock */ ++ bcm2835_mmc_set_clock(host, host->clock); ++ bcm2835_mmc_writeb(host, ctrl, SDHCI_HOST_CONTROL); ++ ++ mmiowb(); ++ ++ spin_unlock_irqrestore(&host->lock, flags); ++} ++ ++ ++static struct mmc_host_ops bcm2835_ops = { ++ .request = bcm2835_mmc_request, ++ .set_ios = bcm2835_mmc_set_ios, ++ .enable_sdio_irq = bcm2835_mmc_enable_sdio_irq, ++}; ++ ++ ++static void bcm2835_mmc_tasklet_finish(unsigned long param) ++{ ++ struct bcm2835_host *host; ++ unsigned long flags; ++ struct mmc_request *mrq; ++ ++ host = (struct bcm2835_host *)param; ++ ++ spin_lock_irqsave(&host->lock, flags); ++ ++ /* ++ * If this tasklet gets rescheduled while running, it will ++ * be run again afterwards but without any active request. ++ */ ++ if (!host->mrq) { ++ spin_unlock_irqrestore(&host->lock, flags); ++ return; ++ } ++ ++ del_timer(&host->timer); ++ ++ mrq = host->mrq; ++ ++ /* ++ * The controller needs a reset of internal state machines ++ * upon error conditions. ++ */ ++ if (!(host->flags & SDHCI_DEVICE_DEAD) && ++ ((mrq->cmd && mrq->cmd->error) || ++ (mrq->data && (mrq->data->error || ++ (mrq->data->stop && mrq->data->stop->error))))) { ++ ++ bcm2835_mmc_reset(host, SDHCI_RESET_CMD); ++ bcm2835_mmc_reset(host, SDHCI_RESET_DATA); ++ } ++ ++ host->mrq = NULL; ++ host->cmd = NULL; ++ host->data = NULL; ++ ++ mmiowb(); ++ ++ spin_unlock_irqrestore(&host->lock, flags); ++ mmc_request_done(host->mmc, mrq); ++} ++ ++ ++ ++int bcm2835_mmc_add_host(struct bcm2835_host *host) ++{ ++ struct mmc_host *mmc; ++#ifndef FORCE_PIO ++ struct dma_slave_config cfg; ++#endif ++ int ret; ++ ++ mmc = host->mmc; ++ ++ bcm2835_mmc_reset(host, SDHCI_RESET_ALL); ++ ++ host->clk_mul = 0; ++ ++ mmc->ops = &bcm2835_ops; ++ mmc->f_max = host->max_clk; ++ mmc->f_max = host->max_clk; ++ mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300; ++ ++ /* SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK */ ++ host->timeout_clk = mmc->f_max / 1000; ++#ifdef CONFIG_OF ++ mmc->max_busy_timeout = (1 << 27) / host->timeout_clk; ++#endif ++ /* host controller capabilities */ ++ mmc->caps = MMC_CAP_CMD23 | MMC_CAP_ERASE | MMC_CAP_NEEDS_POLL | MMC_CAP_SDIO_IRQ | ++ MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | MMC_CAP_4_BIT_DATA; ++ ++ host->flags = SDHCI_AUTO_CMD23; ++ ++ spin_lock_init(&host->lock); ++ ++ ++#ifdef FORCE_PIO ++ pr_info("Forcing PIO mode\n"); ++ host->have_dma = false; ++#else ++ if (!host->dma_chan_tx || !host->dma_chan_rx || ++ IS_ERR(host->dma_chan_tx) || IS_ERR(host->dma_chan_rx)) { ++ pr_err("%s: Unable to initialise DMA channels. Falling back to PIO\n", DRIVER_NAME); ++ host->have_dma = false; ++ } else { ++ pr_info("DMA channels allocated for the MMC driver"); ++ host->have_dma = true; ++ ++ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; ++ cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; ++ cfg.slave_id = 11; /* DREQ channel */ ++ ++ cfg.direction = DMA_MEM_TO_DEV; ++ cfg.src_addr = 0; ++ cfg.dst_addr = host->phys_addr + SDHCI_BUFFER; ++ ret = dmaengine_slave_config(host->dma_chan_tx, &cfg); ++ ++ cfg.direction = DMA_DEV_TO_MEM; ++ cfg.src_addr = host->phys_addr + SDHCI_BUFFER; ++ cfg.dst_addr = 0; ++ ret = dmaengine_slave_config(host->dma_chan_rx, &cfg); ++ } ++#endif ++ ++ ++ mmc->max_segs = 128; ++ mmc->max_req_size = 524288; ++ mmc->max_seg_size = mmc->max_req_size; ++ mmc->max_blk_size = 512; ++ mmc->max_blk_count = 65535; ++ ++ /* report supported voltage ranges */ ++ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; ++ ++ tasklet_init(&host->finish_tasklet, ++ bcm2835_mmc_tasklet_finish, (unsigned long)host); ++ ++ setup_timer(&host->timer, bcm2835_mmc_timeout_timer, (unsigned long)host); ++ init_waitqueue_head(&host->buf_ready_int); ++ ++ bcm2835_mmc_init(host, 0); ++#ifndef CONFIG_OF ++ ret = request_irq(host->irq, bcm2835_mmc_irq, 0 /*IRQF_SHARED*/, ++ mmc_hostname(mmc), host); ++#else ++ ret = request_threaded_irq(host->irq, bcm2835_mmc_irq, bcm2835_mmc_thread_irq, ++ IRQF_SHARED, mmc_hostname(mmc), host); ++#endif ++ if (ret) { ++ pr_err("%s: Failed to request IRQ %d: %d\n", ++ mmc_hostname(mmc), host->irq, ret); ++ goto untasklet; ++ } ++ ++ mmiowb(); ++ mmc_add_host(mmc); ++ ++ pr_info("Load BCM2835 MMC driver\n"); ++ ++ return 0; ++ ++untasklet: ++ tasklet_kill(&host->finish_tasklet); ++ ++ return ret; ++} ++ ++static int bcm2835_mmc_probe(struct platform_device *pdev) ++{ ++ struct device *dev = &pdev->dev; ++#ifdef CONFIG_OF ++ struct device_node *node = dev->of_node; ++ struct clk *clk; ++#endif ++ struct resource *iomem; ++ struct bcm2835_host *host = NULL; ++ ++ int ret; ++ struct mmc_host *mmc; ++#if !defined(CONFIG_OF) && !defined(FORCE_PIO) ++ dma_cap_mask_t mask; ++#endif ++ ++ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ if (!iomem) { ++ ret = -ENOMEM; ++ goto err; ++ } ++ ++ if (resource_size(iomem) < 0x100) ++ dev_err(&pdev->dev, "Invalid iomem size!\n"); ++ ++ mmc = mmc_alloc_host(sizeof(struct bcm2835_host), dev); ++ host = mmc_priv(mmc); ++ host->mmc = mmc; ++ ++ ++ if (IS_ERR(host)) { ++ ret = PTR_ERR(host); ++ goto err; ++ } ++ ++ host->phys_addr = iomem->start + BCM2835_VCMMU_SHIFT; ++ ++#ifndef CONFIG_OF ++#ifndef FORCE_PIO ++ dma_cap_zero(mask); ++ /* we don't care about the channel, any would work */ ++ dma_cap_set(DMA_SLAVE, mask); ++ ++ host->dma_chan_tx = dma_request_channel(mask, NULL, NULL); ++ host->dma_chan_rx = dma_request_channel(mask, NULL, NULL); ++#endif ++ host->max_clk = BCM2835_CLOCK_FREQ; ++ ++#else ++#ifndef FORCE_PIO ++ host->dma_chan_tx = of_dma_request_slave_channel(node, "tx"); ++ host->dma_chan_rx = of_dma_request_slave_channel(node, "rx"); ++#endif ++ clk = of_clk_get(node, 0); ++ if (IS_ERR(clk)) { ++ dev_err(dev, "get CLOCK failed\n"); ++ ret = PTR_ERR(clk); ++ goto out; ++ } ++ host->max_clk = (clk_get_rate(clk)); ++#endif ++ host->irq = platform_get_irq(pdev, 0); ++ ++ if (!request_mem_region(iomem->start, resource_size(iomem), ++ mmc_hostname(host->mmc))) { ++ dev_err(&pdev->dev, "cannot request region\n"); ++ ret = -EBUSY; ++ goto err_request; ++ } ++ ++ host->ioaddr = ioremap(iomem->start, resource_size(iomem)); ++ if (!host->ioaddr) { ++ dev_err(&pdev->dev, "failed to remap registers\n"); ++ ret = -ENOMEM; ++ goto err_remap; ++ } ++ ++ platform_set_drvdata(pdev, host); ++ ++ ++ if (host->irq <= 0) { ++ dev_err(dev, "get IRQ failed\n"); ++ ret = -EINVAL; ++ goto out; ++ } ++ ++ ++#ifndef CONFIG_OF ++ mmc->caps |= MMC_CAP_4_BIT_DATA; ++#else ++ mmc_of_parse(mmc); ++#endif ++ host->timeout = msecs_to_jiffies(1000); ++ spin_lock_init(&host->lock); ++ mmc->ops = &bcm2835_ops; ++ return bcm2835_mmc_add_host(host); ++ ++ ++err_remap: ++ release_mem_region(iomem->start, resource_size(iomem)); ++err_request: ++ mmc_free_host(host->mmc); ++err: ++ dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); ++ return ret; ++out: ++ if (mmc) ++ mmc_free_host(mmc); ++ return ret; ++} ++ ++static int bcm2835_mmc_remove(struct platform_device *pdev) ++{ ++ struct bcm2835_host *host = platform_get_drvdata(pdev); ++ struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ unsigned long flags; ++ int dead; ++ u32 scratch; ++ ++ dead = 0; ++ scratch = bcm2835_mmc_readl(host, SDHCI_INT_STATUS); ++ if (scratch == (u32)-1) ++ dead = 1; ++ ++ ++ if (dead) { ++ spin_lock_irqsave(&host->lock, flags); ++ ++ host->flags |= SDHCI_DEVICE_DEAD; ++ ++ if (host->mrq) { ++ pr_err("%s: Controller removed during " ++ " transfer!\n", mmc_hostname(host->mmc)); ++ ++ host->mrq->cmd->error = -ENOMEDIUM; ++ tasklet_schedule(&host->finish_tasklet); ++ } ++ ++ spin_unlock_irqrestore(&host->lock, flags); ++ } ++ ++ mmc_remove_host(host->mmc); ++ ++ if (!dead) ++ bcm2835_mmc_reset(host, SDHCI_RESET_ALL); ++ ++ free_irq(host->irq, host); ++ ++ del_timer_sync(&host->timer); ++ ++ tasklet_kill(&host->finish_tasklet); ++ ++ iounmap(host->ioaddr); ++ release_mem_region(iomem->start, resource_size(iomem)); ++ mmc_free_host(host->mmc); ++ platform_set_drvdata(pdev, NULL); ++ ++ return 0; ++} ++ ++ ++static const struct of_device_id bcm2835_mmc_match[] = { ++ { .compatible = "brcm,bcm2835-mmc" }, ++ { } ++}; ++MODULE_DEVICE_TABLE(of, bcm2835_mmc_match); ++ ++ ++ ++static struct platform_driver bcm2835_mmc_driver = { ++ .probe = bcm2835_mmc_probe, ++ .remove = bcm2835_mmc_remove, ++ .driver = { ++ .name = DRIVER_NAME, ++ .owner = THIS_MODULE, ++ .of_match_table = bcm2835_mmc_match, ++ }, ++}; ++module_platform_driver(bcm2835_mmc_driver); ++ ++MODULE_ALIAS("platform:mmc-bcm2835"); ++MODULE_DESCRIPTION("BCM2835 SDHCI driver"); ++MODULE_LICENSE("GPL v2"); ++MODULE_AUTHOR("Gellert Weisz"); +-- +1.8.3.2 + |