powerpc/512x: add function for chip select parameter configuration

Add ability to configure chip select (CS) parameters for devices
that need different CS parameters setup after their configuration.
I.e. an FPGA device on LP bus can require different CS parameters
for its bus interface after loading firmware into it. A driver
can easily reconfigure the LPC CS parameters using this function.
Acked-by: NTimur Tabi <timur@tabi.org>
Signed-off-by: NAnatolij Gustschin <agust@denx.de>

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__ */

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);