arm: mx5: clock: add support for changing CPU clock via cmdline

[karo-tx-uboot.git] / include / spi.h

diff --git a/include/spi.h b/include/spi.h
index 60e85db9a46e052c97b638c58bb93114a378e3b7..c0dab578bfa53533efe72cb6f6bb70c162c03d84 100644 (file)
--- a/include/spi.h
+++ b/include/spi.h
@@ -2,23 +2,7 @@
  * (C) Copyright 2001
  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
  *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * 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
+ * SPDX-License-Identifier:    GPL-2.0+
  */
 
 #ifndef _SPI_H_
@@ -37,11 +21,16 @@
 #define        SPI_LSB_FIRST   0x08                    /* per-word bits-on-wire */
 #define        SPI_3WIRE       0x10                    /* SI/SO signals shared */
 #define        SPI_LOOP        0x20                    /* loopback mode */
+#define        SPI_SLAVE       0x40                    /* slave mode */
+#define        SPI_PREAMBLE    0x80                    /* Skip preamble bytes */
 
 /* SPI transfer flags */
 #define SPI_XFER_BEGIN 0x01                    /* Assert CS before transfer */
 #define SPI_XFER_END   0x02                    /* Deassert CS after transfer */
 
+/* Header byte that marks the start of the message */
+#define SPI_PREAMBLE_END_BYTE  0xec
+
 /*-----------------------------------------------------------------------
  * Representation of a SPI slave, i.e. what we're communicating with.
  *
@@ -49,10 +38,13 @@
  *
  *   bus:      ID of the bus that the slave is attached to.
  *   cs:       ID of the chip select connected to the slave.
+ *   max_write_size:   If non-zero, the maximum number of bytes which can
+ *             be written at once, excluding command bytes.
  */
 struct spi_slave {
        unsigned int    bus;
        unsigned int    cs;
+       unsigned int max_write_size;
 };
 
 /*-----------------------------------------------------------------------
@@ -62,6 +54,47 @@ struct spi_slave {
  */
 void spi_init(void);
 
+/**
+ * spi_do_alloc_slave - Allocate a new SPI slave (internal)
+ *
+ * Allocate and zero all fields in the spi slave, and set the bus/chip
+ * select. Use the helper macro spi_alloc_slave() to call this.
+ *
+ * @offset: Offset of struct spi_slave within slave structure
+ * @size: Size of slave structure
+ * @bus: Bus ID of the slave chip.
+ * @cs: Chip select ID of the slave chip on the specified bus.
+ */
+void *spi_do_alloc_slave(int offset, int size, unsigned int bus,
+                        unsigned int cs);
+
+/**
+ * spi_alloc_slave - Allocate a new SPI slave
+ *
+ * Allocate and zero all fields in the spi slave, and set the bus/chip
+ * select.
+ *
+ * @_struct: Name of structure to allocate (e.g. struct tegra_spi). This
+ *     structure must contain a member 'struct spi_slave *slave'.
+ * @bus: Bus ID of the slave chip.
+ * @cs: Chip select ID of the slave chip on the specified bus.
+ */
+#define spi_alloc_slave(_struct, bus, cs) \
+       spi_do_alloc_slave(offsetof(_struct, slave), \
+                           sizeof(_struct), bus, cs)
+
+/**
+ * spi_alloc_slave_base - Allocate a new SPI slave with no private data
+ *
+ * Allocate and zero all fields in the spi slave, and set the bus/chip
+ * select.
+ *
+ * @bus: Bus ID of the slave chip.
+ * @cs: Chip select ID of the slave chip on the specified bus.
+ */
+#define spi_alloc_slave_base(bus, cs) \
+       spi_do_alloc_slave(0, sizeof(struct spi_slave), bus, cs)
+
 /*-----------------------------------------------------------------------
  * Set up communications parameters for a SPI slave.
  *
@@ -198,4 +231,20 @@ static inline int spi_w8r8(struct spi_slave *slave, unsigned char byte)
        return ret < 0 ? ret : din[1];
 }
 
+/**
+ * Set up a SPI slave for a particular device tree node
+ *
+ * This calls spi_setup_slave() with the correct bus number. Call
+ * spi_free_slave() to free it later.
+ *
+ * @param blob         Device tree blob
+ * @param node         SPI peripheral node to use
+ * @param cs           Chip select to use
+ * @param max_hz       Maximum SCK rate in Hz (0 for default)
+ * @param mode         Clock polarity, clock phase and other parameters
+ * @return pointer to new spi_slave structure
+ */
+struct spi_slave *spi_setup_slave_fdt(const void *blob, int node,
+               unsigned int cs, unsigned int max_hz, unsigned int mode);
+
 #endif /* _SPI_H_ */