diff options
| -rw-r--r-- | arch/powerpc/include/asm/mpc5121.h | 16 | ||||
| -rw-r--r-- | arch/powerpc/platforms/512x/mpc512x_shared.c | 30 |
2 files changed, 46 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mpc5121.h b/arch/powerpc/include/asm/mpc5121.h index 8c0ab2ca689c..8ae133eaf9fa 100644 --- a/arch/powerpc/include/asm/mpc5121.h +++ b/arch/powerpc/include/asm/mpc5121.h @@ -53,4 +53,20 @@ struct mpc512x_ccm { u32 m4ccr; /* MSCAN4 CCR */ u8 res[0x98]; /* Reserved */ }; + +/* + * LPC Module + */ +struct mpc512x_lpc { + u32 cs_cfg[8]; /* CS config */ + u32 cs_ctrl; /* CS Control Register */ + u32 cs_status; /* CS Status Register */ + u32 burst_ctrl; /* CS Burst Control Register */ + u32 deadcycle_ctrl; /* CS Deadcycle Control Register */ + u32 holdcycle_ctrl; /* CS Holdcycle Control Register */ + u32 alt; /* Address Latch Timing Register */ +}; + +int mpc512x_cs_config(unsigned int cs, u32 val); + #endif /* __ASM_POWERPC_MPC5121_H__ */ diff --git a/arch/powerpc/platforms/512x/mpc512x_shared.c b/arch/powerpc/platforms/512x/mpc512x_shared.c index c34443849d9a..824cbee68df2 100644 --- a/arch/powerpc/platforms/512x/mpc512x_shared.c +++ b/arch/powerpc/platforms/512x/mpc512x_shared.c @@ -436,3 +436,33 @@ void __init mpc512x_init(void) mpc512x_restart_init(); mpc512x_psc_fifo_init(); } + +/** + * mpc512x_cs_config - Setup chip select configuration + * @cs: chip select number + * @val: chip select configuration value + * + * Perform chip select configuration for devices on LocalPlus Bus. + * Intended to dynamically reconfigure the chip select parameters + * for configurable devices on the bus. + */ +int mpc512x_cs_config(unsigned int cs, u32 val) +{ + static struct mpc512x_lpc __iomem *lpc; + struct device_node *np; + + if (cs > 7) + return -EINVAL; + + if (!lpc) { + np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-lpc"); + lpc = of_iomap(np, 0); + of_node_put(np); + if (!lpc) + return -ENOMEM; + } + + out_be32(&lpc->cs_cfg[cs], val); + return 0; +} +EXPORT_SYMBOL(mpc512x_cs_config); |