[U-Boot] [PATCH] spi: cadence_qspi: Enable quad mode for read and programming

[Marek Vasut <marex@denx.de>]

On Wednesday, August 26, 2015 at 09:30:07 AM, Chin Liang See wrote:
> On Wed, 2015-08-26 at 08:57 +0200, marex at denx.de wrote:
> > On Wednesday, August 26, 2015 at 02:09:55 AM, Chin Liang See wrote:
> > > Enable the quad output fast read and quad input fast program
> > > support. Quad mode is supported by Cadence QSPI controller.
> > > 
> > > Signed-off-by: Chin Liang See <clsee@altera.com>
> > > Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
> > > Cc: Stefan Roese <sr@denx.de>
> > > Cc: Vikas Manocha <vikas.manocha@st.com>
> > > Cc: Jagannadh Teki <jteki@openedev.com>
> > > Cc: Pavel Machek <pavel@denx.de>
> > > Cc: Marek Vasut <marex@denx.de>
> > > ---
> > > 
> > >  drivers/spi/cadence_qspi.c     |   11 +++++++++++
> > >  drivers/spi/cadence_qspi_apb.c |   16 ++++++++++++----
> > >  2 files changed, 23 insertions(+), 4 deletions(-)
> > > 
> > > diff --git a/drivers/spi/cadence_qspi.c b/drivers/spi/cadence_qspi.c
> > > index 34a0f46..c6b69c4 100644
> > > --- a/drivers/spi/cadence_qspi.c
> > > +++ b/drivers/spi/cadence_qspi.c
> > > @@ -318,6 +318,16 @@ static int cadence_spi_ofdata_to_platdata(struct
> > > udevice *bus) return 0;
> > > 
> > >  }
> > > 
> > > +static int cadence_spi_child_pre_probe(struct udevice *dev)
> > > +{
> > > +	struct spi_slave *slave = dev_get_parentdata(dev);
> > > +
> > > +	/* Cadence QSPI controller can support quad read and program */
> > > +	slave->op_mode_rx = SPI_OPM_RX_QOF;
> > > +	slave->op_mode_tx = SPI_OPM_TX_QPP;
> > > +	return 0;
> > > +}
> > > +
> > > 
> > >  static const struct dm_spi_ops cadence_spi_ops = {
> > >  
> > >  	.xfer		= cadence_spi_xfer,
> > >  	.set_speed	= cadence_spi_set_speed,
> > > 
> > > @@ -341,5 +351,6 @@ U_BOOT_DRIVER(cadence_spi) = {
> > > 
> > >  	.ofdata_to_platdata = cadence_spi_ofdata_to_platdata,
> > >  	.platdata_auto_alloc_size = sizeof(struct cadence_spi_platdata),
> > >  	.priv_auto_alloc_size = sizeof(struct cadence_spi_priv),
> > > 
> > > +	.child_pre_probe = cadence_spi_child_pre_probe,
> > > 
> > >  	.probe = cadence_spi_probe,
> > >  
> > >  };
> > 
> > Simon, can you please check if this DM bit is correct ?
> > 
> > > diff --git a/drivers/spi/cadence_qspi_apb.c
> > > b/drivers/spi/cadence_qspi_apb.c index d053407..deffb6b 100644
> > > --- a/drivers/spi/cadence_qspi_apb.c
> > > +++ b/drivers/spi/cadence_qspi_apb.c
> > > @@ -29,6 +29,9 @@
> > > 
> > >  #include <asm/io.h>
> > >  #include <asm/errno.h>
> > >  #include "cadence_qspi.h"
> > > 
> > > +#include <spi.h>
> > > +#include <spi_flash.h>
> > > +#include "../mtd/spi/sf_internal.h"
> > 
> > Why do you need this include ?
> 
> Actually I am comparing the opcode to determine whether its a quad
> command. If yes, we need to setup the controller accordingly.

Ewww, I think we should implement something similar to:

https://lkml.org/lkml/2015/8/24/299
[PATCH linux-next v4 1/5] mtd: spi-nor: notify (Q)SPI controller about protocol 
change