Some nitpicks.
On 10/24/2012 10:20 AM, Stephen Warren wrote:
This adds a simple driver for the BCM2835's SD controller.
Workarounds are implemented for:
* Register writes can't be too close to each-other in time, or they will
be lost.
* Register accesses must all be 32-bit, so implement custom accessors.
This code was extracted from:
git://github.com/gonzoua/u-boot-pi.git master
which was created by Oleksandr Tymoshenko.
Portions of the code there were obviously based on the Linux kernel at:
git://github.com/raspberrypi/linux.git rpi-3.2.27
No s-o-b tags were present in either location.
swarren changed the following for upstream:
* Removed hack udelay()s in bcm2835_sdhci_raw_writel(); setting
SDHCI_QUIRK_WAIT_SEND_CMD appears to solve the issues.
* Remove register logging from read*/write* functions.
* Sort out confusion with min/max_freq values passed to add_sdhci().
* Simplified and commented twoticks_delay calculation.
* checkpatch fixes.
Cc: Oleksandr Tymoshenko<go...@bluezbox.com>
Signed-off-by: Stephen Warren<swar...@wwwdotorg.org>
---
This series is based on the previous bcm2835 patches I sent, to add the
mbox and video drivers. Patch 1 should be independant, but patch 2 depends
on those other patches.
arch/arm/include/asm/arch-bcm2835/sdhci.h | 24 ++++
drivers/mmc/Makefile | 1 +
drivers/mmc/bcm2835_sdhci.c | 172 +++++++++++++++++++++++++++++
3 files changed, 197 insertions(+)
create mode 100644 arch/arm/include/asm/arch-bcm2835/sdhci.h
create mode 100644 drivers/mmc/bcm2835_sdhci.c
diff --git a/arch/arm/include/asm/arch-bcm2835/sdhci.h
b/arch/arm/include/asm/arch-bcm2835/sdhci.h
new file mode 100644
index 0000000..a4f867b
--- /dev/null
+++ b/arch/arm/include/asm/arch-bcm2835/sdhci.h
@@ -0,0 +1,24 @@
+/*
+ * (C) Copyright 2012 Stephen Warren
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#ifndef _BCM2835_SDHCI_H_
+#define _BCM2835_SDHCI_H_
+
+#define BCM2835_SDHCI_BASE 0x20300000
+
+int bcm2835_sdhci_init(u32 regbase, u32 emmc_freq);
+
+#endif
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index a1dd730..6be36f2 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -43,6 +43,7 @@ COBJS-$(CONFIG_MXS_MMC) += mxsmmc.o
COBJS-$(CONFIG_OMAP_HSMMC) += omap_hsmmc.o
COBJS-$(CONFIG_PXA_MMC_GENERIC) += pxa_mmc_gen.o
COBJS-$(CONFIG_SDHCI) += sdhci.o
+COBJS-$(CONFIG_BCM2835_SDHCI) += bcm2835_sdhci.o
COBJS-$(CONFIG_S5P_SDHCI) += s5p_sdhci.o
COBJS-$(CONFIG_SH_MMCIF) += sh_mmcif.o
COBJS-$(CONFIG_TEGRA_MMC) += tegra_mmc.o
diff --git a/drivers/mmc/bcm2835_sdhci.c b/drivers/mmc/bcm2835_sdhci.c
new file mode 100644
index 0000000..1d623c0
--- /dev/null
+++ b/drivers/mmc/bcm2835_sdhci.c
@@ -0,0 +1,172 @@
+/*
+ * This code was extracted from:
+ * git://github.com/gonzoua/u-boot-pi.git master
+ * and hence presumably (C) 2012 Oleksandr Tymoshenko
+ *
+ * Tweaks for U-Boot upstreaming
+ * (C) 2012 Stephen Warren
+ *
+ * Portions (e.g. read/write macros, concepts for back-to-back register write
+ * timing workarounds) obviously extracted from the Linux kernel at:
+ * https://github.com/raspberrypi/linux.git rpi-3.2.27
+ *
+ * The Linux kernel code has the following (c) and license, which is hence
+ * propagated to Oleksandr's tree and here:
+ *
+ * Support for SDHCI device on 2835
+ * Based on sdhci-bcm2708.c (c) 2010 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * SDHCI platform device - Arasan SD controller in BCM2708
+ *
+ * Inspired by sdhci-pci.c, by Pierre Ossman
+ */
+
+#include<common.h>
+#include<malloc.h>
+#include<sdhci.h>
+
+/* 400KHz is max freq for card ID etc. Use that as min */
+#define MIN_FREQ 400000
+
+static uint twoticks_delay;
+
+static inline void bcm2835_sdhci_raw_writel(struct sdhci_host *host, u32 val,
+ int reg)
+{
+ static ulong last_write;
+
+ /*
+ * The Arasan has a bugette whereby it may lose the content of
+ * successive writes to registers that are within two SD-card clock
+ * cycles of each other (a clock domain crossing problem).
+ * It seems, however, that the data register does not have this problem.
+ * (Which is just as well - otherwise we'd have to nobble the DMA engine
+ * too)
+ */
+ while (get_timer(last_write)< twoticks_delay)
+ ;
+
+ writel(val, host->ioaddr + reg);
+ last_write = get_timer(0);
+}
+
+static inline u32 bcm2835_sdhci_raw_readl(struct sdhci_host *host, int reg)
+{
+ return readl(host->ioaddr + reg);
+}
+
+static void bcm2835_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
+{
+ bcm2835_sdhci_raw_writel(host, val, reg);
+}
+
+static void bcm2835_sdhci_writew(struct sdhci_host *host, u16 val, int reg)
+{
+ static u32 shadow;
+
+ u32 p = reg == SDHCI_COMMAND ? shadow :
+ bcm2835_sdhci_raw_readl(host, reg& ~3);
+ u32 s = reg<< 3& 0x18;
+ u32 l = val<< s;
+ u32 m = 0xffff<< s;
+
+ if (reg == SDHCI_TRANSFER_MODE)
+ shadow = (p& ~m) | l;
+ else
+ bcm2835_sdhci_raw_writel(host, (p& ~m) | l, reg& ~3);
+}
+
+static void bcm2835_sdhci_writeb(struct sdhci_host *host, u8 val, int reg)
+{
+ u32 p = bcm2835_sdhci_raw_readl(host, reg& ~3);
+ u32 s = reg<< 3& 0x18;
+ u32 l = val<< s;
+ u32 m = 0xff<< s;
+
+ bcm2835_sdhci_raw_writel(host, (p& ~m) | l, reg& ~3);
+}
+
+static u32 bcm2835_sdhci_readl(struct sdhci_host *host, int reg)
+{
+ u32 val = bcm2835_sdhci_raw_readl(host, reg);
+
+ return val;
+}
+
+static u16 bcm2835_sdhci_readw(struct sdhci_host *host, int reg)
+{
+ u32 val = bcm2835_sdhci_raw_readl(host, (reg& ~3));
+ val = val>> (reg<< 3& 0x18)& 0xffff;
+
+ return (u16)val;
+}
+
+static u8 bcm2835_sdhci_readb(struct sdhci_host *host, int reg)
+{
+ u32 val = bcm2835_sdhci_raw_readl(host, (reg& ~3));
+ val = val>> (reg<< 3& 0x18)& 0xff;
+
+ return (u8)val;
+}
Can the above used magics be made as macros?
~Vikram
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
