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-rw-r--r--target/linux/brcm2708/patches-3.18/0058-MMC-added-alternative-MMC-driver.patch1698
1 files changed, 0 insertions, 1698 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
deleted file mode 100644
index c984412413..0000000000
--- a/target/linux/brcm2708/patches-3.18/0058-MMC-added-alternative-MMC-driver.patch
+++ /dev/null
@@ -1,1698 +0,0 @@
-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
-
---- 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
---- a/arch/arm/mach-bcm2708/bcm2708.c
-+++ b/arch/arm/mach-bcm2708/bcm2708.c
-@@ -414,6 +414,34 @@ static struct platform_device bcm2708_sy
- },
- };
-
-+#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]);
---- 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
---- a/drivers/mmc/host/Makefile
-+++ b/drivers/mmc/host/Makefile
-@@ -17,6 +17,7 @@ obj-$(CONFIG_MMC_SDHCI_PXAV2) += sdhci-p
- obj-$(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
---- /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");
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-03 22:20:18 +0000