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authorRoger Quadros <rogerq@ti.com>2015-08-05 13:58:01 +0300
committerRoger Quadros <rogerq@ti.com>2016-04-15 11:51:34 +0300
commitf47fcad63f6847ea677c6c7030f30fd6438e0052 (patch)
tree756f2115f570e1c35a47f4e254d0196bc220ec0e /drivers/memory
parentfabe7d7756d17f5da4bd80fa2373c4bd93ed39e5 (diff)
downloadlinux-f47fcad63f6847ea677c6c7030f30fd6438e0052.tar.xz
memory: omap-gpmc: Introduce GPMC to NAND interface
The OMAP GPMC module has certain registers dedicated for NAND access and some NAND bits mixed with other GPMC functionality. For the NAND dedicated registers we have the struct gpmc_nand_regs. The NAND driver needs to access NAND specific bits from the following non-dedicated registers - EMPTYWRITEBUFFERSTATUS from GPMC_STATUS For accessing these bits we introduce the struct gpmc_nand_ops. Add gpmc_omap_get_nand_ops() that returns the gpmc_nand_ops along with updating the gpmc_nand_regs. This API will be called by the OMAP NAND driver to access the necessary bits in GPMC register space. Signed-off-by: Roger Quadros <rogerq@ti.com> Acked-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'drivers/memory')
-rw-r--r--drivers/memory/omap-gpmc.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index 21825ddce4a3..0b62afd86f7e 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -1118,6 +1118,27 @@ void gpmc_update_nand_reg(struct gpmc_nand_regs *reg, int cs)
}
}
+static struct gpmc_nand_ops nand_ops;
+
+/**
+ * gpmc_omap_get_nand_ops - Get the GPMC NAND interface
+ * @regs: the GPMC NAND register map exclusive for NAND use.
+ * @cs: GPMC chip select number on which the NAND sits. The
+ * register map returned will be specific to this chip select.
+ *
+ * Returns NULL on error e.g. invalid cs.
+ */
+struct gpmc_nand_ops *gpmc_omap_get_nand_ops(struct gpmc_nand_regs *reg, int cs)
+{
+ if (cs >= gpmc_cs_num)
+ return NULL;
+
+ gpmc_update_nand_reg(reg, cs);
+
+ return &nand_ops;
+}
+EXPORT_SYMBOL_GPL(gpmc_omap_get_nand_ops);
+
int gpmc_get_client_irq(unsigned irq_config)
{
int i;