mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2024-12-10 00:36:40 +00:00
83d6a36019
SVN-Revision: 23213
1099 lines
28 KiB
Diff
1099 lines
28 KiB
Diff
From 11bc6d97096ab89da31f628c89b19ff37dfdd526 Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Thu, 15 Jul 2010 20:06:04 +0000
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Subject: [PATCH] MMC: Add support for the controller on JZ4740 SoCs.
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Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
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Acked-by: Matt Fleming <matt@console-pimps.org>
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Cc: Andrew Morton <akpm@linux-foundation.org>
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Cc: Matt Fleming <matt@console-pimps.org>
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Cc: linux-mmc@vger.kernel.org
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Cc: linux-mips@linux-mips.org
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Cc: linux-kernel@vger.kernel.org
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Patchwork: https://patchwork.linux-mips.org/patch/1463/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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---
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arch/mips/include/asm/mach-jz4740/jz4740_mmc.h | 15 +
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drivers/mmc/host/Kconfig | 9 +
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drivers/mmc/host/Makefile | 1 +
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drivers/mmc/host/jz4740_mmc.c | 1029 ++++++++++++++++++++++++
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4 files changed, 1054 insertions(+), 0 deletions(-)
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create mode 100644 arch/mips/include/asm/mach-jz4740/jz4740_mmc.h
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create mode 100644 drivers/mmc/host/jz4740_mmc.c
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--- /dev/null
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+++ b/arch/mips/include/asm/mach-jz4740/jz4740_mmc.h
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@@ -0,0 +1,15 @@
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+#ifndef __LINUX_MMC_JZ4740_MMC
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+#define __LINUX_MMC_JZ4740_MMC
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+
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+struct jz4740_mmc_platform_data {
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+ int gpio_power;
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+ int gpio_card_detect;
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+ int gpio_read_only;
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+ unsigned card_detect_active_low:1;
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+ unsigned read_only_active_low:1;
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+ unsigned power_active_low:1;
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+
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+ unsigned data_1bit:1;
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+};
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+
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+#endif
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--- a/drivers/mmc/host/Kconfig
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+++ b/drivers/mmc/host/Kconfig
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@@ -457,3 +457,12 @@ config MMC_SH_MMCIF
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This selects the MMC Host Interface controler (MMCIF).
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This driver supports MMCIF in sh7724/sh7757/sh7372.
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+
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+config MMC_JZ4740
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+ tristate "JZ4740 SD/Multimedia Card Interface support"
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+ depends on MACH_JZ4740
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+ help
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+ This selects support for the SD/MMC controller on Ingenic JZ4740
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+ SoCs.
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+ If you have a board based on such a SoC and with a SD/MMC slot,
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+ say Y or M here.
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--- a/drivers/mmc/host/Makefile
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+++ b/drivers/mmc/host/Makefile
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@@ -37,6 +37,7 @@ obj-$(CONFIG_MMC_VIA_SDMMC) += via-sdmmc
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obj-$(CONFIG_GPIOMMC) += gpiommc.o
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obj-$(CONFIG_SDH_BFIN) += bfin_sdh.o
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obj-$(CONFIG_MMC_SH_MMCIF) += sh_mmcif.o
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+obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o
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obj-$(CONFIG_MMC_SDHCI_OF) += sdhci-of.o
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sdhci-of-y := sdhci-of-core.o
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--- /dev/null
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+++ b/drivers/mmc/host/jz4740_mmc.c
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@@ -0,0 +1,1029 @@
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+/*
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+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
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+ * JZ4740 SD/MMC controller driver
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#include <linux/mmc/host.h>
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+#include <linux/io.h>
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+#include <linux/irq.h>
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+#include <linux/interrupt.h>
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/delay.h>
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+#include <linux/scatterlist.h>
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+#include <linux/clk.h>
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+
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+#include <linux/bitops.h>
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+#include <linux/gpio.h>
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+#include <asm/mach-jz4740/gpio.h>
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+#include <asm/cacheflush.h>
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+#include <linux/dma-mapping.h>
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+
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+#include <asm/mach-jz4740/jz4740_mmc.h>
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+
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+#define JZ_REG_MMC_STRPCL 0x00
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+#define JZ_REG_MMC_STATUS 0x04
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+#define JZ_REG_MMC_CLKRT 0x08
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+#define JZ_REG_MMC_CMDAT 0x0C
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+#define JZ_REG_MMC_RESTO 0x10
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+#define JZ_REG_MMC_RDTO 0x14
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+#define JZ_REG_MMC_BLKLEN 0x18
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+#define JZ_REG_MMC_NOB 0x1C
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+#define JZ_REG_MMC_SNOB 0x20
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+#define JZ_REG_MMC_IMASK 0x24
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+#define JZ_REG_MMC_IREG 0x28
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+#define JZ_REG_MMC_CMD 0x2C
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+#define JZ_REG_MMC_ARG 0x30
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+#define JZ_REG_MMC_RESP_FIFO 0x34
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+#define JZ_REG_MMC_RXFIFO 0x38
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+#define JZ_REG_MMC_TXFIFO 0x3C
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+
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+#define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
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+#define JZ_MMC_STRPCL_EXIT_TRANSFER BIT(6)
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+#define JZ_MMC_STRPCL_START_READWAIT BIT(5)
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+#define JZ_MMC_STRPCL_STOP_READWAIT BIT(4)
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+#define JZ_MMC_STRPCL_RESET BIT(3)
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+#define JZ_MMC_STRPCL_START_OP BIT(2)
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+#define JZ_MMC_STRPCL_CLOCK_CONTROL (BIT(1) | BIT(0))
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+#define JZ_MMC_STRPCL_CLOCK_STOP BIT(0)
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+#define JZ_MMC_STRPCL_CLOCK_START BIT(1)
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+
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+
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+#define JZ_MMC_STATUS_IS_RESETTING BIT(15)
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+#define JZ_MMC_STATUS_SDIO_INT_ACTIVE BIT(14)
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+#define JZ_MMC_STATUS_PRG_DONE BIT(13)
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+#define JZ_MMC_STATUS_DATA_TRAN_DONE BIT(12)
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+#define JZ_MMC_STATUS_END_CMD_RES BIT(11)
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+#define JZ_MMC_STATUS_DATA_FIFO_AFULL BIT(10)
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+#define JZ_MMC_STATUS_IS_READWAIT BIT(9)
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+#define JZ_MMC_STATUS_CLK_EN BIT(8)
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+#define JZ_MMC_STATUS_DATA_FIFO_FULL BIT(7)
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+#define JZ_MMC_STATUS_DATA_FIFO_EMPTY BIT(6)
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+#define JZ_MMC_STATUS_CRC_RES_ERR BIT(5)
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+#define JZ_MMC_STATUS_CRC_READ_ERROR BIT(4)
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+#define JZ_MMC_STATUS_TIMEOUT_WRITE BIT(3)
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+#define JZ_MMC_STATUS_CRC_WRITE_ERROR BIT(2)
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+#define JZ_MMC_STATUS_TIMEOUT_RES BIT(1)
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+#define JZ_MMC_STATUS_TIMEOUT_READ BIT(0)
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+
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+#define JZ_MMC_STATUS_READ_ERROR_MASK (BIT(4) | BIT(0))
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+#define JZ_MMC_STATUS_WRITE_ERROR_MASK (BIT(3) | BIT(2))
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+
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+
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+#define JZ_MMC_CMDAT_IO_ABORT BIT(11)
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+#define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10)
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+#define JZ_MMC_CMDAT_DMA_EN BIT(8)
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+#define JZ_MMC_CMDAT_INIT BIT(7)
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+#define JZ_MMC_CMDAT_BUSY BIT(6)
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+#define JZ_MMC_CMDAT_STREAM BIT(5)
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+#define JZ_MMC_CMDAT_WRITE BIT(4)
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+#define JZ_MMC_CMDAT_DATA_EN BIT(3)
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+#define JZ_MMC_CMDAT_RESPONSE_FORMAT (BIT(2) | BIT(1) | BIT(0))
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+#define JZ_MMC_CMDAT_RSP_R1 1
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+#define JZ_MMC_CMDAT_RSP_R2 2
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+#define JZ_MMC_CMDAT_RSP_R3 3
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+
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+#define JZ_MMC_IRQ_SDIO BIT(7)
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+#define JZ_MMC_IRQ_TXFIFO_WR_REQ BIT(6)
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+#define JZ_MMC_IRQ_RXFIFO_RD_REQ BIT(5)
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+#define JZ_MMC_IRQ_END_CMD_RES BIT(2)
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+#define JZ_MMC_IRQ_PRG_DONE BIT(1)
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+#define JZ_MMC_IRQ_DATA_TRAN_DONE BIT(0)
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+
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+
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+#define JZ_MMC_CLK_RATE 24000000
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+
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+enum jz4740_mmc_state {
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+ JZ4740_MMC_STATE_READ_RESPONSE,
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+ JZ4740_MMC_STATE_TRANSFER_DATA,
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+ JZ4740_MMC_STATE_SEND_STOP,
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+ JZ4740_MMC_STATE_DONE,
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+};
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+
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+struct jz4740_mmc_host {
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+ struct mmc_host *mmc;
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+ struct platform_device *pdev;
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+ struct jz4740_mmc_platform_data *pdata;
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+ struct clk *clk;
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+
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+ int irq;
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+ int card_detect_irq;
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+
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+ struct resource *mem;
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+ void __iomem *base;
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+ struct mmc_request *req;
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+ struct mmc_command *cmd;
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+
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+ unsigned long waiting;
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+
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+ uint32_t cmdat;
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+
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+ uint16_t irq_mask;
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+
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+ spinlock_t lock;
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+
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+ struct timer_list timeout_timer;
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+ struct sg_mapping_iter miter;
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+ enum jz4740_mmc_state state;
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+};
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+
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+static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host,
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+ unsigned int irq, bool enabled)
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+{
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&host->lock, flags);
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+ if (enabled)
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+ host->irq_mask &= ~irq;
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+ else
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+ host->irq_mask |= irq;
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+ spin_unlock_irqrestore(&host->lock, flags);
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+
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+ writew(host->irq_mask, host->base + JZ_REG_MMC_IMASK);
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+}
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+
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+static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host,
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+ bool start_transfer)
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+{
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+ uint16_t val = JZ_MMC_STRPCL_CLOCK_START;
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+
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+ if (start_transfer)
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+ val |= JZ_MMC_STRPCL_START_OP;
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+
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+ writew(val, host->base + JZ_REG_MMC_STRPCL);
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+}
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+
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+static void jz4740_mmc_clock_disable(struct jz4740_mmc_host *host)
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+{
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+ uint32_t status;
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+ unsigned int timeout = 1000;
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+
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+ writew(JZ_MMC_STRPCL_CLOCK_STOP, host->base + JZ_REG_MMC_STRPCL);
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+ do {
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+ status = readl(host->base + JZ_REG_MMC_STATUS);
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+ } while (status & JZ_MMC_STATUS_CLK_EN && --timeout);
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+}
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+
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+static void jz4740_mmc_reset(struct jz4740_mmc_host *host)
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+{
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+ uint32_t status;
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+ unsigned int timeout = 1000;
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+
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+ writew(JZ_MMC_STRPCL_RESET, host->base + JZ_REG_MMC_STRPCL);
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+ udelay(10);
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+ do {
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+ status = readl(host->base + JZ_REG_MMC_STATUS);
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+ } while (status & JZ_MMC_STATUS_IS_RESETTING && --timeout);
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+}
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+
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+static void jz4740_mmc_request_done(struct jz4740_mmc_host *host)
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+{
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+ struct mmc_request *req;
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+
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+ req = host->req;
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+ host->req = NULL;
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+
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+ mmc_request_done(host->mmc, req);
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+}
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+
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+static unsigned int jz4740_mmc_poll_irq(struct jz4740_mmc_host *host,
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+ unsigned int irq)
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+{
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+ unsigned int timeout = 0x800;
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+ uint16_t status;
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+
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+ do {
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+ status = readw(host->base + JZ_REG_MMC_IREG);
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+ } while (!(status & irq) && --timeout);
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+
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+ if (timeout == 0) {
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+ set_bit(0, &host->waiting);
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+ mod_timer(&host->timeout_timer, jiffies + 5*HZ);
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+ jz4740_mmc_set_irq_enabled(host, irq, true);
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+ return true;
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+ }
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+
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+ return false;
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+}
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+
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+static void jz4740_mmc_transfer_check_state(struct jz4740_mmc_host *host,
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+ struct mmc_data *data)
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+{
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+ int status;
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+
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+ status = readl(host->base + JZ_REG_MMC_STATUS);
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+ if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK) {
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+ if (status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
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+ host->req->cmd->error = -ETIMEDOUT;
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+ data->error = -ETIMEDOUT;
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+ } else {
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+ host->req->cmd->error = -EIO;
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+ data->error = -EIO;
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+ }
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+ }
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+}
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+
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+static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
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+ struct mmc_data *data)
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+{
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+ struct sg_mapping_iter *miter = &host->miter;
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+ void __iomem *fifo_addr = host->base + JZ_REG_MMC_TXFIFO;
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+ uint32_t *buf;
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+ bool timeout;
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+ size_t i, j;
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+
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+ while (sg_miter_next(miter)) {
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+ buf = miter->addr;
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+ i = miter->length / 4;
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+ j = i / 8;
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+ i = i & 0x7;
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+ while (j) {
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+ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
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+ if (unlikely(timeout))
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+ goto poll_timeout;
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+
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+ writel(buf[0], fifo_addr);
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+ writel(buf[1], fifo_addr);
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+ writel(buf[2], fifo_addr);
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+ writel(buf[3], fifo_addr);
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+ writel(buf[4], fifo_addr);
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+ writel(buf[5], fifo_addr);
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+ writel(buf[6], fifo_addr);
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+ writel(buf[7], fifo_addr);
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+ buf += 8;
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+ --j;
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+ }
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+ if (unlikely(i)) {
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+ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
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+ if (unlikely(timeout))
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+ goto poll_timeout;
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+
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+ while (i) {
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+ writel(*buf, fifo_addr);
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+ ++buf;
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+ --i;
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+ }
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+ }
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+ data->bytes_xfered += miter->length;
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+ }
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+ sg_miter_stop(miter);
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+
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+ return false;
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+
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+poll_timeout:
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+ miter->consumed = (void *)buf - miter->addr;
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+ data->bytes_xfered += miter->consumed;
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+ sg_miter_stop(miter);
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+
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+ return true;
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+}
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+
|
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+static bool jz4740_mmc_read_data(struct jz4740_mmc_host *host,
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+ struct mmc_data *data)
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+{
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+ struct sg_mapping_iter *miter = &host->miter;
|
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+ void __iomem *fifo_addr = host->base + JZ_REG_MMC_RXFIFO;
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+ uint32_t *buf;
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+ uint32_t d;
|
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+ uint16_t status;
|
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+ size_t i, j;
|
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+ unsigned int timeout;
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+
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+ while (sg_miter_next(miter)) {
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+ buf = miter->addr;
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+ i = miter->length;
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+ j = i / 32;
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+ i = i & 0x1f;
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+ while (j) {
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+ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
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+ if (unlikely(timeout))
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+ goto poll_timeout;
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+
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+ buf[0] = readl(fifo_addr);
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+ buf[1] = readl(fifo_addr);
|
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+ buf[2] = readl(fifo_addr);
|
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+ buf[3] = readl(fifo_addr);
|
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+ buf[4] = readl(fifo_addr);
|
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+ buf[5] = readl(fifo_addr);
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+ buf[6] = readl(fifo_addr);
|
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+ buf[7] = readl(fifo_addr);
|
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+
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+ buf += 8;
|
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+ --j;
|
|
+ }
|
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+
|
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+ if (unlikely(i)) {
|
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+ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
|
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+ if (unlikely(timeout))
|
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+ goto poll_timeout;
|
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+
|
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+ while (i >= 4) {
|
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+ *buf++ = readl(fifo_addr);
|
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+ i -= 4;
|
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+ }
|
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+ if (unlikely(i > 0)) {
|
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+ d = readl(fifo_addr);
|
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+ memcpy(buf, &d, i);
|
|
+ }
|
|
+ }
|
|
+ data->bytes_xfered += miter->length;
|
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+
|
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+ /* This can go away once MIPS implements
|
|
+ * flush_kernel_dcache_page */
|
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+ flush_dcache_page(miter->page);
|
|
+ }
|
|
+ sg_miter_stop(miter);
|
|
+
|
|
+ /* For whatever reason there is sometime one word more in the fifo then
|
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+ * requested */
|
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+ timeout = 1000;
|
|
+ status = readl(host->base + JZ_REG_MMC_STATUS);
|
|
+ while (!(status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout) {
|
|
+ d = readl(fifo_addr);
|
|
+ status = readl(host->base + JZ_REG_MMC_STATUS);
|
|
+ }
|
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+
|
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+ return false;
|
|
+
|
|
+poll_timeout:
|
|
+ miter->consumed = (void *)buf - miter->addr;
|
|
+ data->bytes_xfered += miter->consumed;
|
|
+ sg_miter_stop(miter);
|
|
+
|
|
+ return true;
|
|
+}
|
|
+
|
|
+static void jz4740_mmc_timeout(unsigned long data)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)data;
|
|
+
|
|
+ if (!test_and_clear_bit(0, &host->waiting))
|
|
+ return;
|
|
+
|
|
+ jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false);
|
|
+
|
|
+ host->req->cmd->error = -ETIMEDOUT;
|
|
+ jz4740_mmc_request_done(host);
|
|
+}
|
|
+
|
|
+static void jz4740_mmc_read_response(struct jz4740_mmc_host *host,
|
|
+ struct mmc_command *cmd)
|
|
+{
|
|
+ int i;
|
|
+ uint16_t tmp;
|
|
+ void __iomem *fifo_addr = host->base + JZ_REG_MMC_RESP_FIFO;
|
|
+
|
|
+ if (cmd->flags & MMC_RSP_136) {
|
|
+ tmp = readw(fifo_addr);
|
|
+ for (i = 0; i < 4; ++i) {
|
|
+ cmd->resp[i] = tmp << 24;
|
|
+ tmp = readw(fifo_addr);
|
|
+ cmd->resp[i] |= tmp << 8;
|
|
+ tmp = readw(fifo_addr);
|
|
+ cmd->resp[i] |= tmp >> 8;
|
|
+ }
|
|
+ } else {
|
|
+ cmd->resp[0] = readw(fifo_addr) << 24;
|
|
+ cmd->resp[0] |= readw(fifo_addr) << 8;
|
|
+ cmd->resp[0] |= readw(fifo_addr) & 0xff;
|
|
+ }
|
|
+}
|
|
+
|
|
+static void jz4740_mmc_send_command(struct jz4740_mmc_host *host,
|
|
+ struct mmc_command *cmd)
|
|
+{
|
|
+ uint32_t cmdat = host->cmdat;
|
|
+
|
|
+ host->cmdat &= ~JZ_MMC_CMDAT_INIT;
|
|
+ jz4740_mmc_clock_disable(host);
|
|
+
|
|
+ host->cmd = cmd;
|
|
+
|
|
+ if (cmd->flags & MMC_RSP_BUSY)
|
|
+ cmdat |= JZ_MMC_CMDAT_BUSY;
|
|
+
|
|
+ switch (mmc_resp_type(cmd)) {
|
|
+ case MMC_RSP_R1B:
|
|
+ case MMC_RSP_R1:
|
|
+ cmdat |= JZ_MMC_CMDAT_RSP_R1;
|
|
+ break;
|
|
+ case MMC_RSP_R2:
|
|
+ cmdat |= JZ_MMC_CMDAT_RSP_R2;
|
|
+ break;
|
|
+ case MMC_RSP_R3:
|
|
+ cmdat |= JZ_MMC_CMDAT_RSP_R3;
|
|
+ break;
|
|
+ default:
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ if (cmd->data) {
|
|
+ cmdat |= JZ_MMC_CMDAT_DATA_EN;
|
|
+ if (cmd->data->flags & MMC_DATA_WRITE)
|
|
+ cmdat |= JZ_MMC_CMDAT_WRITE;
|
|
+ if (cmd->data->flags & MMC_DATA_STREAM)
|
|
+ cmdat |= JZ_MMC_CMDAT_STREAM;
|
|
+
|
|
+ writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN);
|
|
+ writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB);
|
|
+ }
|
|
+
|
|
+ writeb(cmd->opcode, host->base + JZ_REG_MMC_CMD);
|
|
+ writel(cmd->arg, host->base + JZ_REG_MMC_ARG);
|
|
+ writel(cmdat, host->base + JZ_REG_MMC_CMDAT);
|
|
+
|
|
+ jz4740_mmc_clock_enable(host, 1);
|
|
+}
|
|
+
|
|
+static void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host)
|
|
+{
|
|
+ struct mmc_command *cmd = host->req->cmd;
|
|
+ struct mmc_data *data = cmd->data;
|
|
+ int direction;
|
|
+
|
|
+ if (data->flags & MMC_DATA_READ)
|
|
+ direction = SG_MITER_TO_SG;
|
|
+ else
|
|
+ direction = SG_MITER_FROM_SG;
|
|
+
|
|
+ sg_miter_start(&host->miter, data->sg, data->sg_len, direction);
|
|
+}
|
|
+
|
|
+
|
|
+static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid;
|
|
+ struct mmc_command *cmd = host->req->cmd;
|
|
+ struct mmc_request *req = host->req;
|
|
+ bool timeout = false;
|
|
+
|
|
+ if (cmd->error)
|
|
+ host->state = JZ4740_MMC_STATE_DONE;
|
|
+
|
|
+ switch (host->state) {
|
|
+ case JZ4740_MMC_STATE_READ_RESPONSE:
|
|
+ if (cmd->flags & MMC_RSP_PRESENT)
|
|
+ jz4740_mmc_read_response(host, cmd);
|
|
+
|
|
+ if (!cmd->data)
|
|
+ break;
|
|
+
|
|
+ jz_mmc_prepare_data_transfer(host);
|
|
+
|
|
+ case JZ4740_MMC_STATE_TRANSFER_DATA:
|
|
+ if (cmd->data->flags & MMC_DATA_READ)
|
|
+ timeout = jz4740_mmc_read_data(host, cmd->data);
|
|
+ else
|
|
+ timeout = jz4740_mmc_write_data(host, cmd->data);
|
|
+
|
|
+ if (unlikely(timeout)) {
|
|
+ host->state = JZ4740_MMC_STATE_TRANSFER_DATA;
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ jz4740_mmc_transfer_check_state(host, cmd->data);
|
|
+
|
|
+ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
|
|
+ if (unlikely(timeout)) {
|
|
+ host->state = JZ4740_MMC_STATE_SEND_STOP;
|
|
+ break;
|
|
+ }
|
|
+ writew(JZ_MMC_IRQ_DATA_TRAN_DONE, host->base + JZ_REG_MMC_IREG);
|
|
+
|
|
+ case JZ4740_MMC_STATE_SEND_STOP:
|
|
+ if (!req->stop)
|
|
+ break;
|
|
+
|
|
+ jz4740_mmc_send_command(host, req->stop);
|
|
+
|
|
+ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_PRG_DONE);
|
|
+ if (timeout) {
|
|
+ host->state = JZ4740_MMC_STATE_DONE;
|
|
+ break;
|
|
+ }
|
|
+ case JZ4740_MMC_STATE_DONE:
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ if (!timeout)
|
|
+ jz4740_mmc_request_done(host);
|
|
+
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+static irqreturn_t jz_mmc_irq(int irq, void *devid)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = devid;
|
|
+ struct mmc_command *cmd = host->cmd;
|
|
+ uint16_t irq_reg, status, tmp;
|
|
+
|
|
+ irq_reg = readw(host->base + JZ_REG_MMC_IREG);
|
|
+
|
|
+ tmp = irq_reg;
|
|
+ irq_reg &= ~host->irq_mask;
|
|
+
|
|
+ tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ |
|
|
+ JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE);
|
|
+
|
|
+ if (tmp != irq_reg)
|
|
+ writew(tmp & ~irq_reg, host->base + JZ_REG_MMC_IREG);
|
|
+
|
|
+ if (irq_reg & JZ_MMC_IRQ_SDIO) {
|
|
+ writew(JZ_MMC_IRQ_SDIO, host->base + JZ_REG_MMC_IREG);
|
|
+ mmc_signal_sdio_irq(host->mmc);
|
|
+ irq_reg &= ~JZ_MMC_IRQ_SDIO;
|
|
+ }
|
|
+
|
|
+ if (host->req && cmd && irq_reg) {
|
|
+ if (test_and_clear_bit(0, &host->waiting)) {
|
|
+ del_timer(&host->timeout_timer);
|
|
+
|
|
+ status = readl(host->base + JZ_REG_MMC_STATUS);
|
|
+
|
|
+ if (status & JZ_MMC_STATUS_TIMEOUT_RES) {
|
|
+ cmd->error = -ETIMEDOUT;
|
|
+ } else if (status & JZ_MMC_STATUS_CRC_RES_ERR) {
|
|
+ cmd->error = -EIO;
|
|
+ } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
|
|
+ JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
|
|
+ if (cmd->data)
|
|
+ cmd->data->error = -EIO;
|
|
+ cmd->error = -EIO;
|
|
+ } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
|
|
+ JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
|
|
+ if (cmd->data)
|
|
+ cmd->data->error = -EIO;
|
|
+ cmd->error = -EIO;
|
|
+ }
|
|
+
|
|
+ jz4740_mmc_set_irq_enabled(host, irq_reg, false);
|
|
+ writew(irq_reg, host->base + JZ_REG_MMC_IREG);
|
|
+
|
|
+ return IRQ_WAKE_THREAD;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate)
|
|
+{
|
|
+ int div = 0;
|
|
+ int real_rate;
|
|
+
|
|
+ jz4740_mmc_clock_disable(host);
|
|
+ clk_set_rate(host->clk, JZ_MMC_CLK_RATE);
|
|
+
|
|
+ real_rate = clk_get_rate(host->clk);
|
|
+
|
|
+ while (real_rate > rate && div < 7) {
|
|
+ ++div;
|
|
+ real_rate >>= 1;
|
|
+ }
|
|
+
|
|
+ writew(div, host->base + JZ_REG_MMC_CLKRT);
|
|
+ return real_rate;
|
|
+}
|
|
+
|
|
+static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
|
|
+
|
|
+ host->req = req;
|
|
+
|
|
+ writew(0xffff, host->base + JZ_REG_MMC_IREG);
|
|
+
|
|
+ writew(JZ_MMC_IRQ_END_CMD_RES, host->base + JZ_REG_MMC_IREG);
|
|
+ jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, true);
|
|
+
|
|
+ host->state = JZ4740_MMC_STATE_READ_RESPONSE;
|
|
+ set_bit(0, &host->waiting);
|
|
+ mod_timer(&host->timeout_timer, jiffies + 5*HZ);
|
|
+ jz4740_mmc_send_command(host, req->cmd);
|
|
+}
|
|
+
|
|
+static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
|
|
+ if (ios->clock)
|
|
+ jz4740_mmc_set_clock_rate(host, ios->clock);
|
|
+
|
|
+ switch (ios->power_mode) {
|
|
+ case MMC_POWER_UP:
|
|
+ jz4740_mmc_reset(host);
|
|
+ if (gpio_is_valid(host->pdata->gpio_power))
|
|
+ gpio_set_value(host->pdata->gpio_power,
|
|
+ !host->pdata->power_active_low);
|
|
+ host->cmdat |= JZ_MMC_CMDAT_INIT;
|
|
+ clk_enable(host->clk);
|
|
+ break;
|
|
+ case MMC_POWER_ON:
|
|
+ break;
|
|
+ default:
|
|
+ if (gpio_is_valid(host->pdata->gpio_power))
|
|
+ gpio_set_value(host->pdata->gpio_power,
|
|
+ host->pdata->power_active_low);
|
|
+ clk_disable(host->clk);
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ switch (ios->bus_width) {
|
|
+ case MMC_BUS_WIDTH_1:
|
|
+ host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
|
|
+ break;
|
|
+ case MMC_BUS_WIDTH_4:
|
|
+ host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
|
|
+ break;
|
|
+ default:
|
|
+ break;
|
|
+ }
|
|
+}
|
|
+
|
|
+static int jz4740_mmc_get_ro(struct mmc_host *mmc)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
|
|
+ if (!gpio_is_valid(host->pdata->gpio_read_only))
|
|
+ return -ENOSYS;
|
|
+
|
|
+ return gpio_get_value(host->pdata->gpio_read_only) ^
|
|
+ host->pdata->read_only_active_low;
|
|
+}
|
|
+
|
|
+static int jz4740_mmc_get_cd(struct mmc_host *mmc)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
|
|
+ if (!gpio_is_valid(host->pdata->gpio_card_detect))
|
|
+ return -ENOSYS;
|
|
+
|
|
+ return gpio_get_value(host->pdata->gpio_card_detect) ^
|
|
+ host->pdata->card_detect_active_low;
|
|
+}
|
|
+
|
|
+static irqreturn_t jz4740_mmc_card_detect_irq(int irq, void *devid)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = devid;
|
|
+
|
|
+ mmc_detect_change(host->mmc, HZ / 2);
|
|
+
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
|
|
+ jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
|
|
+}
|
|
+
|
|
+static const struct mmc_host_ops jz4740_mmc_ops = {
|
|
+ .request = jz4740_mmc_request,
|
|
+ .set_ios = jz4740_mmc_set_ios,
|
|
+ .get_ro = jz4740_mmc_get_ro,
|
|
+ .get_cd = jz4740_mmc_get_cd,
|
|
+ .enable_sdio_irq = jz4740_mmc_enable_sdio_irq,
|
|
+};
|
|
+
|
|
+static const struct jz_gpio_bulk_request jz4740_mmc_pins[] = {
|
|
+ JZ_GPIO_BULK_PIN(MSC_CMD),
|
|
+ JZ_GPIO_BULK_PIN(MSC_CLK),
|
|
+ JZ_GPIO_BULK_PIN(MSC_DATA0),
|
|
+ JZ_GPIO_BULK_PIN(MSC_DATA1),
|
|
+ JZ_GPIO_BULK_PIN(MSC_DATA2),
|
|
+ JZ_GPIO_BULK_PIN(MSC_DATA3),
|
|
+};
|
|
+
|
|
+static int __devinit jz4740_mmc_request_gpio(struct device *dev, int gpio,
|
|
+ const char *name, bool output, int value)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ if (!gpio_is_valid(gpio))
|
|
+ return 0;
|
|
+
|
|
+ ret = gpio_request(gpio, name);
|
|
+ if (ret) {
|
|
+ dev_err(dev, "Failed to request %s gpio: %d\n", name, ret);
|
|
+ return ret;
|
|
+ }
|
|
+
|
|
+ if (output)
|
|
+ gpio_direction_output(gpio, value);
|
|
+ else
|
|
+ gpio_direction_input(gpio);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int __devinit jz4740_mmc_request_gpios(struct platform_device *pdev)
|
|
+{
|
|
+ int ret;
|
|
+ struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
|
|
+
|
|
+ if (!pdata)
|
|
+ return 0;
|
|
+
|
|
+ ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_card_detect,
|
|
+ "MMC detect change", false, 0);
|
|
+ if (ret)
|
|
+ goto err;
|
|
+
|
|
+ ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_read_only,
|
|
+ "MMC read only", false, 0);
|
|
+ if (ret)
|
|
+ goto err_free_gpio_card_detect;
|
|
+
|
|
+ ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_power,
|
|
+ "MMC read only", true, pdata->power_active_low);
|
|
+ if (ret)
|
|
+ goto err_free_gpio_read_only;
|
|
+
|
|
+ return 0;
|
|
+
|
|
+err_free_gpio_read_only:
|
|
+ if (gpio_is_valid(pdata->gpio_read_only))
|
|
+ gpio_free(pdata->gpio_read_only);
|
|
+err_free_gpio_card_detect:
|
|
+ if (gpio_is_valid(pdata->gpio_card_detect))
|
|
+ gpio_free(pdata->gpio_card_detect);
|
|
+err:
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int __devinit jz4740_mmc_request_cd_irq(struct platform_device *pdev,
|
|
+ struct jz4740_mmc_host *host)
|
|
+{
|
|
+ struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
|
|
+
|
|
+ if (!gpio_is_valid(pdata->gpio_card_detect))
|
|
+ return 0;
|
|
+
|
|
+ host->card_detect_irq = gpio_to_irq(pdata->gpio_card_detect);
|
|
+ if (host->card_detect_irq < 0) {
|
|
+ dev_warn(&pdev->dev, "Failed to get card detect irq\n");
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ return request_irq(host->card_detect_irq, jz4740_mmc_card_detect_irq,
|
|
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
|
+ "MMC card detect", host);
|
|
+}
|
|
+
|
|
+static void jz4740_mmc_free_gpios(struct platform_device *pdev)
|
|
+{
|
|
+ struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
|
|
+
|
|
+ if (!pdata)
|
|
+ return;
|
|
+
|
|
+ if (gpio_is_valid(pdata->gpio_power))
|
|
+ gpio_free(pdata->gpio_power);
|
|
+ if (gpio_is_valid(pdata->gpio_read_only))
|
|
+ gpio_free(pdata->gpio_read_only);
|
|
+ if (gpio_is_valid(pdata->gpio_card_detect))
|
|
+ gpio_free(pdata->gpio_card_detect);
|
|
+}
|
|
+
|
|
+static inline size_t jz4740_mmc_num_pins(struct jz4740_mmc_host *host)
|
|
+{
|
|
+ size_t num_pins = ARRAY_SIZE(jz4740_mmc_pins);
|
|
+ if (host->pdata && host->pdata->data_1bit)
|
|
+ num_pins -= 3;
|
|
+
|
|
+ return num_pins;
|
|
+}
|
|
+
|
|
+static int __devinit jz4740_mmc_probe(struct platform_device* pdev)
|
|
+{
|
|
+ int ret;
|
|
+ struct mmc_host *mmc;
|
|
+ struct jz4740_mmc_host *host;
|
|
+ struct jz4740_mmc_platform_data *pdata;
|
|
+
|
|
+ pdata = pdev->dev.platform_data;
|
|
+
|
|
+ mmc = mmc_alloc_host(sizeof(struct jz4740_mmc_host), &pdev->dev);
|
|
+ if (!mmc) {
|
|
+ dev_err(&pdev->dev, "Failed to alloc mmc host structure\n");
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+
|
|
+ host = mmc_priv(mmc);
|
|
+ host->pdata = pdata;
|
|
+
|
|
+ host->irq = platform_get_irq(pdev, 0);
|
|
+ if (host->irq < 0) {
|
|
+ ret = host->irq;
|
|
+ dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
|
|
+ goto err_free_host;
|
|
+ }
|
|
+
|
|
+ host->clk = clk_get(&pdev->dev, "mmc");
|
|
+ if (!host->clk) {
|
|
+ ret = -ENOENT;
|
|
+ dev_err(&pdev->dev, "Failed to get mmc clock\n");
|
|
+ goto err_free_host;
|
|
+ }
|
|
+
|
|
+ host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ if (!host->mem) {
|
|
+ ret = -ENOENT;
|
|
+ dev_err(&pdev->dev, "Failed to get base platform memory\n");
|
|
+ goto err_clk_put;
|
|
+ }
|
|
+
|
|
+ host->mem = request_mem_region(host->mem->start,
|
|
+ resource_size(host->mem), pdev->name);
|
|
+ if (!host->mem) {
|
|
+ ret = -EBUSY;
|
|
+ dev_err(&pdev->dev, "Failed to request base memory region\n");
|
|
+ goto err_clk_put;
|
|
+ }
|
|
+
|
|
+ host->base = ioremap_nocache(host->mem->start, resource_size(host->mem));
|
|
+ if (!host->base) {
|
|
+ ret = -EBUSY;
|
|
+ dev_err(&pdev->dev, "Failed to ioremap base memory\n");
|
|
+ goto err_release_mem_region;
|
|
+ }
|
|
+
|
|
+ ret = jz_gpio_bulk_request(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "Failed to request mmc pins: %d\n", ret);
|
|
+ goto err_iounmap;
|
|
+ }
|
|
+
|
|
+ ret = jz4740_mmc_request_gpios(pdev);
|
|
+ if (ret)
|
|
+ goto err_gpio_bulk_free;
|
|
+
|
|
+ mmc->ops = &jz4740_mmc_ops;
|
|
+ mmc->f_min = JZ_MMC_CLK_RATE / 128;
|
|
+ mmc->f_max = JZ_MMC_CLK_RATE;
|
|
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
|
|
+ mmc->caps = (pdata && pdata->data_1bit) ? 0 : MMC_CAP_4_BIT_DATA;
|
|
+ mmc->caps |= MMC_CAP_SDIO_IRQ;
|
|
+
|
|
+ mmc->max_blk_size = (1 << 10) - 1;
|
|
+ mmc->max_blk_count = (1 << 15) - 1;
|
|
+ mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
|
|
+
|
|
+ mmc->max_phys_segs = 128;
|
|
+ mmc->max_hw_segs = 128;
|
|
+ mmc->max_seg_size = mmc->max_req_size;
|
|
+
|
|
+ host->mmc = mmc;
|
|
+ host->pdev = pdev;
|
|
+ spin_lock_init(&host->lock);
|
|
+ host->irq_mask = 0xffff;
|
|
+
|
|
+ ret = jz4740_mmc_request_cd_irq(pdev, host);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "Failed to request card detect irq\n");
|
|
+ goto err_free_gpios;
|
|
+ }
|
|
+
|
|
+ ret = request_threaded_irq(host->irq, jz_mmc_irq, jz_mmc_irq_worker, 0,
|
|
+ dev_name(&pdev->dev), host);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
|
|
+ goto err_free_card_detect_irq;
|
|
+ }
|
|
+
|
|
+ jz4740_mmc_reset(host);
|
|
+ jz4740_mmc_clock_disable(host);
|
|
+ setup_timer(&host->timeout_timer, jz4740_mmc_timeout,
|
|
+ (unsigned long)host);
|
|
+ /* It is not important when it times out, it just needs to timeout. */
|
|
+ set_timer_slack(&host->timeout_timer, HZ);
|
|
+
|
|
+ platform_set_drvdata(pdev, host);
|
|
+ ret = mmc_add_host(mmc);
|
|
+
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "Failed to add mmc host: %d\n", ret);
|
|
+ goto err_free_irq;
|
|
+ }
|
|
+ dev_info(&pdev->dev, "JZ SD/MMC card driver registered\n");
|
|
+
|
|
+ return 0;
|
|
+
|
|
+err_free_irq:
|
|
+ free_irq(host->irq, host);
|
|
+err_free_card_detect_irq:
|
|
+ if (host->card_detect_irq >= 0)
|
|
+ free_irq(host->card_detect_irq, host);
|
|
+err_free_gpios:
|
|
+ jz4740_mmc_free_gpios(pdev);
|
|
+err_gpio_bulk_free:
|
|
+ jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
|
|
+err_iounmap:
|
|
+ iounmap(host->base);
|
|
+err_release_mem_region:
|
|
+ release_mem_region(host->mem->start, resource_size(host->mem));
|
|
+err_clk_put:
|
|
+ clk_put(host->clk);
|
|
+err_free_host:
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+ mmc_free_host(mmc);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int __devexit jz4740_mmc_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = platform_get_drvdata(pdev);
|
|
+
|
|
+ del_timer_sync(&host->timeout_timer);
|
|
+ jz4740_mmc_set_irq_enabled(host, 0xff, false);
|
|
+ jz4740_mmc_reset(host);
|
|
+
|
|
+ mmc_remove_host(host->mmc);
|
|
+
|
|
+ free_irq(host->irq, host);
|
|
+ if (host->card_detect_irq >= 0)
|
|
+ free_irq(host->card_detect_irq, host);
|
|
+
|
|
+ jz4740_mmc_free_gpios(pdev);
|
|
+ jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
|
|
+
|
|
+ iounmap(host->base);
|
|
+ release_mem_region(host->mem->start, resource_size(host->mem));
|
|
+
|
|
+ clk_put(host->clk);
|
|
+
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+ mmc_free_host(host->mmc);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+#ifdef CONFIG_PM
|
|
+
|
|
+static int jz4740_mmc_suspend(struct device *dev)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = dev_get_drvdata(dev);
|
|
+
|
|
+ mmc_suspend_host(host->mmc);
|
|
+
|
|
+ jz_gpio_bulk_suspend(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int jz4740_mmc_resume(struct device *dev)
|
|
+{
|
|
+ struct jz4740_mmc_host *host = dev_get_drvdata(dev);
|
|
+
|
|
+ jz_gpio_bulk_resume(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
|
|
+
|
|
+ mmc_resume_host(host->mmc);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+const struct dev_pm_ops jz4740_mmc_pm_ops = {
|
|
+ .suspend = jz4740_mmc_suspend,
|
|
+ .resume = jz4740_mmc_resume,
|
|
+ .poweroff = jz4740_mmc_suspend,
|
|
+ .restore = jz4740_mmc_resume,
|
|
+};
|
|
+
|
|
+#define JZ4740_MMC_PM_OPS (&jz4740_mmc_pm_ops)
|
|
+#else
|
|
+#define JZ4740_MMC_PM_OPS NULL
|
|
+#endif
|
|
+
|
|
+static struct platform_driver jz4740_mmc_driver = {
|
|
+ .probe = jz4740_mmc_probe,
|
|
+ .remove = __devexit_p(jz4740_mmc_remove),
|
|
+ .driver = {
|
|
+ .name = "jz4740-mmc",
|
|
+ .owner = THIS_MODULE,
|
|
+ .pm = JZ4740_MMC_PM_OPS,
|
|
+ },
|
|
+};
|
|
+
|
|
+static int __init jz4740_mmc_init(void)
|
|
+{
|
|
+ return platform_driver_register(&jz4740_mmc_driver);
|
|
+}
|
|
+module_init(jz4740_mmc_init);
|
|
+
|
|
+static void __exit jz4740_mmc_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&jz4740_mmc_driver);
|
|
+}
|
|
+module_exit(jz4740_mmc_exit);
|
|
+
|
|
+MODULE_DESCRIPTION("JZ4740 SD/MMC controller driver");
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|