+ if (chip_info-enable_loopback)
+ chip-cr1 |= SSCR1_LBM;
Who sets the enable_loopback?
[Chao] 'enable_loopback' could be configured by SPI Protocol driver before it
setup SPI controller. Generally it is not set by default because it's used for
test and validation.
Thanks
From: Shubhrajyoti Datta [mailto:omaplinuxker...@gmail.com]
Sent: Wednesday, November 21, 2012 8:08 PM
To: Bi, Chao
Cc: grant.lik...@secretlab.ca; Chen, Jun D;
spi-devel-general@lists.sourceforge.net; a...@linux.intel.com; Mills, Ken K;
Centelles, Sylvain
Subject: Re: [PATCH] SPI: SSP SPI Controller driver
On Wed, Nov 21, 2012 at 7:46 AM, chao bi
chao...@intel.commailto:chao...@intel.com wrote:
This patch is to implement SSP SPI controller driver, which has been applied and
validated on intel Moorestown Medfield platform. The patch are originated by
Ken Mills ken.k.mi...@intel.commailto:ken.k.mi...@intel.com and Sylvain
Centelles sylvain.centel...@intel.commailto:sylvain.centel...@intel.com,
and to be further developed by Channing
chao...@intel.commailto:chao...@intel.com and Chen Jun
jun.d.c...@intel.commailto:jun.d.c...@intel.com according to their
integration validation on Medfield platform.
Signed-off-by: Ken Mills ken.k.mi...@intel.commailto:ken.k.mi...@intel.com
Signed-off-by: Sylvain Centelles
sylvain.centel...@intel.commailto:sylvain.centel...@intel.com
Signed-off-by: channing chao...@intel.commailto:chao...@intel.com
Signed-off-by: Chen Jun jun.d.c...@intel.commailto:jun.d.c...@intel.com
---
drivers/spi/Kconfig |9 +
drivers/spi/Makefile |1 +
drivers/spi/spi-intel-mid-ssp.c | 1407 +
include/linux/spi/spi-intel-mid-ssp.h | 326
4 files changed, 1743 insertions(+), 0 deletions(-)
create mode 100644 drivers/spi/spi-intel-mid-ssp.c
create mode 100644 include/linux/spi/spi-intel-mid-ssp.h
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 1acae35..8b4461b 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -179,6 +179,15 @@ config SPI_IMX
This enables using the Freescale i.MX SPI controllers in master
mode.
+config SPI_INTEL_MID_SSP
+ tristate SSP SPI controller driver for Intel MID platforms
+ depends on SPI_MASTER INTEL_MID_DMAC
+ help
+ This is the unified SSP SPI master controller driver for
+ the Intel MID platforms, handling Moorestown Medfield,
+ master clock mode.
+ It supports Bulverde SSP core.
+
config SPI_LM70_LLP
tristate Parallel port adapter for LM70 eval board (DEVELOPMENT)
depends on PARPORT EXPERIMENTAL
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index c48df47..83f06d0 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_SPI_FSL_ESPI)+= spi-fsl-espi.o
obj-$(CONFIG_SPI_FSL_SPI) += spi-fsl-spi.o
obj-$(CONFIG_SPI_GPIO) += spi-gpio.o
obj-$(CONFIG_SPI_IMX) += spi-imx.o
+obj-$(CONFIG_SPI_INTEL_MID_SSP)+= spi-intel-mid-ssp.o
obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o
obj-$(CONFIG_SPI_MPC512x_PSC) += spi-mpc512x-psc.o
obj-$(CONFIG_SPI_MPC52xx_PSC) += spi-mpc52xx-psc.o
diff --git a/drivers/spi/spi-intel-mid-ssp.c b/drivers/spi/spi-intel-mid-ssp.c
new file mode 100644
index 000..8fca48f
--- /dev/null
+++ b/drivers/spi/spi-intel-mid-ssp.c
@@ -0,0 +1,1407 @@
+/*
+ * spi-intel-mid-ssp.c
+ * This driver supports Bulverde SSP core used on Intel MID platforms
+ * It supports SSP of Moorestown Medfield platforms and handles clock
+ * slave master modes.
+ *
+ * Copyright (c) 2010, Intel Corporation.
+ * Ken Mills ken.k.mi...@intel.commailto:ken.k.mi...@intel.com
+ * Sylvain Centelles
sylvain.centel...@intel.commailto:sylvain.centel...@intel.com
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+/*
+ * Note:
+ *
+ * Supports DMA and non-interrupt polled transfers.
+ *
+ */
+
+#include linux/delay.h
+#include linux/interrupt.h
+#include linux/highmem.h
+#include linux/pci.h
+#include linux/init.h
+#include linux/interrupt.h
+#include linux/dma-mapping.h
+#include linux/intel_mid_dma.h
+#include linux/pm_qos.h
+#include linux/module.h
+
+#include linux/spi/spi.h
+#include linux/spi/spi
