[U-Boot] [u-boot V4] spi/arm-pl022: Add support for ARM PL022 spi controller
Armando Visconti
armando.visconti at st.com
Wed Jun 12 13:10:39 CEST 2013
On 06/10/2013 06:01 PM, Jagan Teki wrote:
> Hi,
>
> Please use the commit header as below: just to sync with remaining
> drivers in tree.
>
> spi: arm-pl022: Add support for ARM PL022 spi controller
>
OK,
I already did it for v5.
I'll keep it for v6 as well...
> On Fri, Jun 7, 2013 at 1:14 PM, Armando Visconti
> <armando.visconti at st.com> wrote:
>> This patch adds the support for the ARM PL022 SPI controller for the standard
>> variant (0x00041022), which has a 16bit wide and 8 locations deep TX/RX FIFO.
>>
>> Signed-off-by: Armando Visconti <armando.visconti at st.com>
>> Signed-off-by: Vipin Kumar <vipin.kumar at st.com>
>> Acked-by: Stefan Roese <sr at denx.de>
>> ---
>> v3->v4
>> Just removed all warnings when running checkpatch.
>> Didn't find Jagan's feedback... So, pls, let me know if we
>> need to change anything else...
>>
>> Armando
>>
>> drivers/spi/Makefile | 1 +
>> drivers/spi/pl022_spi.c | 310 ++++++++++++++++++++++++++++++++++++++++++++++++
>> 2 files changed, 311 insertions(+)
>> create mode 100644 drivers/spi/pl022_spi.c
>>
>> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
>> index d08609e..b6443b1 100644
>> --- a/drivers/spi/Makefile
>> +++ b/drivers/spi/Makefile
>> @@ -47,6 +47,7 @@ COBJS-$(CONFIG_MXC_SPI) += mxc_spi.o
>> COBJS-$(CONFIG_MXS_SPI) += mxs_spi.o
>> COBJS-$(CONFIG_OC_TINY_SPI) += oc_tiny_spi.o
>> COBJS-$(CONFIG_OMAP3_SPI) += omap3_spi.o
>> +COBJS-$(CONFIG_PL022_SPI) += pl022_spi.o
>> COBJS-$(CONFIG_SOFT_SPI) += soft_spi.o
>> COBJS-$(CONFIG_SH_SPI) += sh_spi.o
>> COBJS-$(CONFIG_FSL_ESPI) += fsl_espi.o
>> diff --git a/drivers/spi/pl022_spi.c b/drivers/spi/pl022_spi.c
>> new file mode 100644
>> index 0000000..8a8b9ab
>> --- /dev/null
>> +++ b/drivers/spi/pl022_spi.c
>> @@ -0,0 +1,310 @@
>> +/*
>> + * (C) Copyright 2012
>> + * Armando Visconti, ST Microelectronics, armando.visconti at st.com.
>> + *
>> + * Driver for ARM PL022 SPI Controller. Based on atmel_spi.c
>> + * by Atmel Corporation.
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation; either version 2 of
>> + * the License, or (at your option) any later version.
>> + *
>> + * 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., 59 Temple Place, Suite 330, Boston,
>> + * MA 02111-1307 USA
>> + */
>> +
>> +#include <common.h>
>> +#include <malloc.h>
>> +#include <spi.h>
>> +#include <asm/io.h>
>> +#include <asm/arch/hardware.h>
>> +
>> +/* SSP registers mapping */
>> +struct pl022 {
>> + u32 ssp_cr0; /* 0x000 */
>> + u32 ssp_cr1; /* 0x004 */
>> + u32 ssp_dr; /* 0x008 */
>> + u32 ssp_sr; /* 0x00c */
>> + u32 ssp_cpsr; /* 0x010 */
>> + u32 ssp_imsc; /* 0x014 */
>> + u32 ssp_ris; /* 0x018 */
>> + u32 ssp_mis; /* 0x01c */
>> + u32 ssp_icr; /* 0x020 */
>> + u32 ssp_dmacr; /* 0x024 */
>> + u8 reserved_1[0x080 - 0x028];
>> + u32 ssp_itcr; /* 0x080 */
>> + u32 ssp_itip; /* 0x084 */
>> + u32 ssp_itop; /* 0x088 */
>> + u32 ssp_tdr; /* 0x08c */
>> + u8 reserved_2[0xFE0 - 0x090];
>> + u32 ssp_pid0; /* 0xfe0 */
>> + u32 ssp_pid1; /* 0xfe4 */
>> + u32 ssp_pid2; /* 0xfe8 */
>> + u32 ssp_pid3; /* 0xfec */
>> + u32 ssp_cid0; /* 0xff0 */
>> + u32 ssp_cid1; /* 0xff4 */
>> + u32 ssp_cid2; /* 0xff8 */
>> + u32 ssp_cid3; /* 0xffc */
>> +};
>> +
>> +/* SSP Control Register 0 - SSP_CR0 */
>> +#define SSP_CR0_SPO (0x1 << 6)
>> +#define SSP_CR0_SPH (0x1 << 7)
>> +#define SSP_CR0_8BIT_MODE (0x07)
>> +#define SSP_SCR_MAX (0xFF)
>> +#define SSP_SCR_SHFT 8
>> +
>> +/* SSP Control Register 0 - SSP_CR1 */
>> +#define SSP_CR1_MASK_SSE (0x1 << 1)
>> +
>> +#define SSP_CPSR_MAX (0xFE)
>> +
>> +/* SSP Status Register - SSP_SR */
>> +#define SSP_SR_MASK_TFE (0x1 << 0) /* Transmit FIFO empty */
>> +#define SSP_SR_MASK_TNF (0x1 << 1) /* Transmit FIFO not full */
>> +#define SSP_SR_MASK_RNE (0x1 << 2) /* Receive FIFO not empty */
>> +#define SSP_SR_MASK_RFF (0x1 << 3) /* Receive FIFO full */
>> +#define SSP_SR_MASK_BSY (0x1 << 4) /* Busy Flag */
>> +
>> +struct pl022_spi_slave {
>> + struct spi_slave slave;
>> + void *regs;
>> + unsigned int freq;
>> +};
>> +
>> +static inline struct pl022_spi_slave *to_pl022_spi(struct spi_slave *slave)
>> +{
>> + return container_of(slave, struct pl022_spi_slave, slave);
>> +}
>> +
> ------ TAG+
>> +/*
>> + * Following three functions should be provided by the
>> + * board support package.
>> + */
>> +int __weak spi_cs_is_valid(unsigned int bus, unsigned int cs)
>> +{
>> + return 1;
>> +}
>> +
>> +void __weak spi_cs_activate(struct spi_slave *slave)
>> +{
>> + /* do nothing */
>> +}
>> +
>> +void __weak spi_cs_deactivate(struct spi_slave *slave)
>> +{
>> + /* do nothing */
>> +}
>> +
>> +void spi_init(void)
>> +{
>> + /* do nothing */
>> +}
> -------------------- TAG-
>
> Any specific reason for defining theese on to board?
> Would it be possible to do the same here, as these are spi specific.
>
> I am trying to collaborate the spi code to generic, so-that it has
> some identity as other
> driver did.
The pl022 SPI controller, differently from other SPI controller, does
not provide a chip select pin.
Therefore the CS must handled in a soc-specific way.
What the driver has to do is to provide dummy functions that MUST be
overwritten by soc specific ones.
If you see the pl022 linux driver does the same.
>
>> +
>> +/*
>> + * ARM PL022 exists in different 'flavors'.
>> + * This drivers currently support the standard variant (0x00041022), that has a
>> + * 16bit wide and 8 locations deep TX/RX FIFO.
>> + */
>> +static int pl022_is_supported(struct pl022_spi_slave *ps)
>> +{
>> + struct pl022 *pl022 = (struct pl022 *)ps->regs;
>> +
>> + /* PL022 version is 0x00041022 */
>> + if ((readl(&pl022->ssp_pid0) == 0x22) &&
>> + (readl(&pl022->ssp_pid1) == 0x10) &&
>> + ((readl(&pl022->ssp_pid2) & 0xf) == 0x04) &&
>> + (readl(&pl022->ssp_pid3) == 0x00))
>
> Tab space is required, for this if statement i guess, please check.
>
If I do then checkpatch reports a warning, saying that I need to keep
all lines of a 'if' statement aligned properly...
So, I guess that this way is more proper.
>> + return 1;
>> +
>> + return 0;
>> +}
>> +
>> +struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
>> + unsigned int max_hz, unsigned int mode)
>> +{
>> + struct pl022_spi_slave *ps;
>> + struct pl022 *pl022;
>> + u16 scr = 1, prescaler, cr0 = 0, cpsr = 0;
>> +
>> + if (!spi_cs_is_valid(bus, cs))
>> + return NULL;
>> +
>
> ----- TAG+
>> + ps = malloc(sizeof(*ps));
>> + if (!ps)
>> + return NULL;
>> +
>> + ps->slave.bus = bus;
>> + ps->slave.cs = cs;
> ----- TAG-
>
> Code from TAG+ to TAG-, please use spi_alloc_slave()
> refer any ddriver in rivers/spi/*
>
ok, I'll do it!
Pls let me know if we are now fine...
Thx,
Arm
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