[U-Boot] [PATCH 2/5] mpc8308rdb: add support for Spansion SPI flash on header J8
Ira W. Snyder
iws at ovro.caltech.edu
Wed Sep 12 23:17:32 CEST 2012
From: "Ira W. Snyder" <iws at ovro.caltech.edu>
The SPI pins are routed to header J8 for testing SPI functionality. A
Spansion flash has been wired up and tested on this header.
This patch breaks support for the second TSEC interface, since the GPIO
pin used as a chip select is pinmuxed with some of the TSEC pins.
Signed-off-by: Ira W. Snyder <iws at ovro.caltech.edu>
---
board/freescale/mpc8308rdb/mpc8308rdb.c | 49 +++++++++++++++++++++++++++++++
include/configs/MPC8308RDB.h | 13 ++++++++
2 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/board/freescale/mpc8308rdb/mpc8308rdb.c b/board/freescale/mpc8308rdb/mpc8308rdb.c
index 5c54357..b97cdc1 100644
--- a/board/freescale/mpc8308rdb/mpc8308rdb.c
+++ b/board/freescale/mpc8308rdb/mpc8308rdb.c
@@ -24,6 +24,7 @@
#include <common.h>
#include <hwconfig.h>
#include <i2c.h>
+#include <spi.h>
#include <libfdt.h>
#include <fdt_support.h>
#include <pci.h>
@@ -36,6 +37,35 @@
DECLARE_GLOBAL_DATA_PTR;
+/*
+ * The following are used to control the SPI chip selects for the SPI command.
+ */
+#ifdef CONFIG_MPC8XXX_SPI
+
+#define SPI_CS_MASK 0x00400000
+
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+ return bus == 0 && cs == 0;
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+ immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
+
+ /* active low */
+ clrbits_be32(&immr->gpio[0].dat, SPI_CS_MASK);
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+ immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
+
+ /* inactive high */
+ setbits_be32(&immr->gpio[0].dat, SPI_CS_MASK);
+}
+#endif /* CONFIG_MPC8XXX_SPI */
+
static u8 read_board_info(void)
{
u8 val8;
@@ -109,6 +139,25 @@ void pci_init_board(void)
*/
int misc_init_r(void)
{
+#ifdef CONFIG_MPC8XXX_SPI
+ immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
+ sysconf83xx_t *sysconf = &immr->sysconf;
+
+ /*
+ * Set proper bits in SICRH to allow SPI on header J8
+ *
+ * NOTE: this breaks the TSEC2 interface, attached to the Vitesse
+ * switch. The pinmux configuration does not have a fine enough
+ * granularity to support both simultaneously.
+ */
+ clrsetbits_be32(&sysconf->sicrh, SICRH_GPIO_A_TSEC2, SICRH_GPIO_A_GPIO);
+ puts("WARNING: SPI enabled, TSEC2 support is broken\n");
+
+ /* Set header J8 SPI chip select output, disabled */
+ setbits_be32(&immr->gpio[0].dir, SPI_CS_MASK);
+ setbits_be32(&immr->gpio[0].dat, SPI_CS_MASK);
+#endif
+
#ifdef CONFIG_VSC7385_IMAGE
if (vsc7385_upload_firmware((void *) CONFIG_VSC7385_IMAGE,
CONFIG_VSC7385_IMAGE_SIZE)) {
diff --git a/include/configs/MPC8308RDB.h b/include/configs/MPC8308RDB.h
index 7f2761c..a24538a 100644
--- a/include/configs/MPC8308RDB.h
+++ b/include/configs/MPC8308RDB.h
@@ -340,6 +340,19 @@
#define CONFIG_SYS_I2C_OFFSET 0x3000
#define CONFIG_SYS_I2C2_OFFSET 0x3100
+/*
+ * SPI on header J8
+ *
+ * WARNING: enabling this will break TSEC2 (connected to the Vitesse switch)
+ * due to a pinmux conflict between GPIO9 (SPI chip select )and the TSEC2 pins.
+ */
+#ifdef CONFIG_MPC8XXX_SPI
+#define CONFIG_CMD_SPI
+#define CONFIG_USE_SPIFLASH
+#define CONFIG_SPI_FLASH
+#define CONFIG_SPI_FLASH_SPANSION
+#define CONFIG_CMD_SF
+#endif
/*
* Board info - revision and where boot from
--
1.7.8.6
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