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From: Raffaele Recalcati on 28 Jun 2010 02:50
From: Raffaele Recalcati <raffaele.recalcati(a)bticino.it>

It is not everytime possible, due to hardware constraints,
to use the hw chip select available on spi port.
So I add this possibility using a gpio as chip select.
If controller_data variable is not null it is
the gpio to be used as chip select.
The default case is compatible with evmdm365.
This patch has been developed against the
http://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-davinci.git
git tree and has been tested on bmx board (similar to dm365 evm but with
gpio as spi chip select).

Signed-off-by: Raffaele Recalcati <raffaele.recalcati(a)bticino.it>
Signed-off-by: Davide Bonfanti <davide.bonfanti(a)bticino.it>
---
arch/arm/mach-davinci/dm365.c | 10 ++++++----
drivers/spi/davinci_spi.c | 27 ++++++++++++++++++---------
2 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/arch/arm/mach-davinci/dm365.c b/arch/arm/mach-davinci/dm365.c
index a146849..42fd4a4 100644
--- a/arch/arm/mach-davinci/dm365.c
+++ b/arch/arm/mach-davinci/dm365.c
@@ -677,10 +677,12 @@ void __init dm365_init_spi0(unsigned chipselect_mask,
davinci_cfg_reg(DM365_SPI0_SDO);

/* not all slaves will be wired up */
- if (chipselect_mask & BIT(0))
- davinci_cfg_reg(DM365_SPI0_SDENA0);
- if (chipselect_mask & BIT(1))
- davinci_cfg_reg(DM365_SPI0_SDENA1);
+ if (!((unsigned long) info->controller_data)) {
+ if (chipselect_mask & BIT(0))
+ davinci_cfg_reg(DM365_SPI0_SDENA0);
+ if (chipselect_mask & BIT(1))
+ davinci_cfg_reg(DM365_SPI0_SDENA1);
+ }

spi_register_board_info(info, len);

diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c
index 95afb6b..621ae46 100644
--- a/drivers/spi/davinci_spi.c
+++ b/drivers/spi/davinci_spi.c
@@ -29,6 +29,7 @@
#include <linux/spi/spi_bitbang.h>
#include <linux/slab.h>

+#include <mach/gpio.h>
#include <mach/spi.h>
#include <mach/edma.h>

@@ -270,18 +271,26 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value)
pdata = davinci_spi->pdata;

/*
- * Board specific chip select logic decides the polarity and cs
- * line for the controller
- */
+ * Board specific chip select logic decides the polarity and cs
+ * line for the controller
+ */
if (value == BITBANG_CS_INACTIVE) {
- set_io_bits(davinci_spi->base + SPIDEF, CS_DEFAULT);
-
- data1_reg_val |= CS_DEFAULT << SPIDAT1_CSNR_SHIFT;
- iowrite32(data1_reg_val, davinci_spi->base + SPIDAT1);
-
+ if ((unsigned long) spi->controller_data) {
+ gpio_set_value(spi->controller_data, \
+ !(spi->mode & SPI_CS_HIGH));
+ } else {
+ set_io_bits(davinci_spi->base + SPIDEF, CS_DEFAULT);
+
+ data1_reg_val |= CS_DEFAULT << SPIDAT1_CSNR_SHIFT;
+ iowrite32(data1_reg_val, davinci_spi->base + SPIDAT1);
+ }
while ((ioread32(davinci_spi->base + SPIBUF)
- & SPIBUF_RXEMPTY_MASK) == 0)
+ & SPIBUF_RXEMPTY_MASK) == 0)
cpu_relax();
+ } else {
+ if ((unsigned long) spi->controller_data)
+ gpio_set_value(spi->controller_data, \
+ (spi->mode & SPI_CS_HIGH));
}
}

--
1.7.0.4

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Prev: [PATCH] DaVinci: dm365: Added clockout2 management and set_sysclk_rate
Next: [PATCH] davinci: dm365: Added swap between y and c data in isif port.