spi: exynos: Support a delay after deactivate

For devices that need some time to react after a spi transaction
finishes, add the ability to set a delay.

Implement this as a delay on the first/next transaction to avoid
any delay in the fairly common case where a SPI transaction is
followed by other processing.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Rajeshwari S Shinde <rajeshwari.s@samsung.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

diff --git a/drivers/spi/exynos_spi.c b/drivers/spi/exynos_spi.c
index efc8b1e..d7fdaac 100644 (file)
--- a/drivers/spi/exynos_spi.c
+++ b/drivers/spi/exynos_spi.c
@@ -26,6 +26,7 @@ struct spi_bus {
        struct exynos_spi *regs;
        int inited;             /* 1 if this bus is ready for use */
        int node;
+       uint deactivate_delay_us;       /* Delay to wait after deactivate */
 };
 
 /* A list of spi buses that we know about */
@@ -40,6 +41,8 @@ struct exynos_spi_slave {
        enum periph_id periph_id;       /* Peripheral ID for this device */
        unsigned int fifo_size;
        int skip_preamble;
+       struct spi_bus *bus;            /* Pointer to our SPI bus info */
+       ulong last_transaction_us;      /* Time of last transaction end */
 };
 
 static struct spi_bus *spi_get_bus(unsigned dev_index)
@@ -85,6 +88,7 @@ struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
        }
 
        bus = &spi_bus[busnum];
+       spi_slave->bus = bus;
        spi_slave->regs = bus->regs;
        spi_slave->mode = mode;
        spi_slave->periph_id = bus->periph_id;
@@ -95,6 +99,7 @@ struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
                spi_slave->fifo_size = 256;
 
        spi_slave->skip_preamble = 0;
+       spi_slave->last_transaction_us = timer_get_us();
 
        spi_slave->freq = bus->frequency;
        if (max_hz)
@@ -359,9 +364,22 @@ void spi_cs_activate(struct spi_slave *slave)
 {
        struct exynos_spi_slave *spi_slave = to_exynos_spi(slave);
 
+       /* If it's too soon to do another transaction, wait */
+       if (spi_slave->bus->deactivate_delay_us &&
+           spi_slave->last_transaction_us) {
+               ulong delay_us;         /* The delay completed so far */
+               delay_us = timer_get_us() - spi_slave->last_transaction_us;
+               if (delay_us < spi_slave->bus->deactivate_delay_us)
+                       udelay(spi_slave->bus->deactivate_delay_us - delay_us);
+       }
+
        clrbits_le32(&spi_slave->regs->cs_reg, SPI_SLAVE_SIG_INACT);
        debug("Activate CS, bus %d\n", spi_slave->slave.bus);
        spi_slave->skip_preamble = spi_slave->mode & SPI_PREAMBLE;
+
+       /* Remember time of this transaction so we can honour the bus delay */
+       if (spi_slave->bus->deactivate_delay_us)
+               spi_slave->last_transaction_us = timer_get_us();
 }
 
 /**
@@ -411,6 +429,8 @@ static int spi_get_config(const void *blob, int node, struct spi_bus *bus)
        /* Use 500KHz as a suitable default */
        bus->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
                                        500000);
+       bus->deactivate_delay_us = fdtdec_get_int(blob, node,
+                                       "spi-deactivate-delay", 0);
 
        return 0;
 }