MIPS: lantiq: Convert the fpi bus driver to a platform_driver

Instead of hacking the configuration of the FPI bus into the arch code
add an own bus driver for this internal bus. The FPI bus is the main
bus of the SoC. This bus driver makes sure the bus is configured
correctly before the child drivers are getting initialized. This driver
will probably also be used on different SoCs later.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: john@phrozen.org
Cc: p.zabel@pengutronix.de
Cc: kishon@ti.com
Cc: mark.rutland@arm.com
Cc: linux-mips@linux-mips.org
Cc: linux-mtd@lists.infradead.org
Cc: linux-watchdog@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-spi@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17122/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 0 insertions, 45 deletions

diff --git a/arch/mips/lantiq/xway/reset.c b/arch/mips/lantiq/xway/reset.c
index 83fd65d..b6752c9 100644
--- a/arch/mips/lantiq/xway/reset.c
+++ b/arch/mips/lantiq/xway/reset.c
@@ -373,10 +373,6 @@ static int __init mips_reboot_setup(void)
 	    of_machine_is_compatible("lantiq,vr9"))
 		ltq_usb_init();
 
-	if (of_machine_is_compatible("lantiq,vr9"))
-		ltq_rcu_w32(ltq_rcu_r32(RCU_AHB_ENDIAN) | RCU_VR9_BE_AHB1S,
-			    RCU_AHB_ENDIAN);
-
 	_machine_restart = ltq_machine_restart;
 	_machine_halt = ltq_machine_halt;
 	pm_power_off = ltq_machine_power_off;
diff --git a/arch/mips/lantiq/xway/sysctrl.c b/arch/mips/lantiq/xway/sysctrl.c
index 95bec46..706639a 100644
--- a/arch/mips/lantiq/xway/sysctrl.c
+++ b/arch/mips/lantiq/xway/sysctrl.c
@@ -145,15 +145,7 @@ static u32 pmu_clk_cr_b[] = {
 #define pmu_w32(x, y)	ltq_w32((x), pmu_membase + (y))
 #define pmu_r32(x)	ltq_r32(pmu_membase + (x))
 
-#define XBAR_ALWAYS_LAST	0x430
-#define XBAR_FPI_BURST_EN	BIT(1)
-#define XBAR_AHB_BURST_EN	BIT(2)
-
-#define xbar_w32(x, y)	ltq_w32((x), ltq_xbar_membase + (y))
-#define xbar_r32(x)	ltq_r32(ltq_xbar_membase + (x))
-
 static void __iomem *pmu_membase;
-static void __iomem *ltq_xbar_membase;
 void __iomem *ltq_cgu_membase;
 void __iomem *ltq_ebu_membase;
 
@@ -293,16 +285,6 @@ static void pci_ext_disable(struct clk *clk)
 	ltq_cgu_w32((1 << 31) | (1 << 30), pcicr);
 }
 
-static void xbar_fpi_burst_disable(void)
-{
-	u32 reg;
-
-	/* bit 1 as 1 --burst; bit 1 as 0 -- single */
-	reg = xbar_r32(XBAR_ALWAYS_LAST);
-	reg &= ~XBAR_FPI_BURST_EN;
-	xbar_w32(reg, XBAR_ALWAYS_LAST);
-}
-
 /* enable a clockout source */
 static int clkout_enable(struct clk *clk)
 {
@@ -459,26 +441,6 @@ void __init ltq_soc_init(void)
 	if (!pmu_membase || !ltq_cgu_membase || !ltq_ebu_membase)
 		panic("Failed to remap core resources");
 
-	if (of_machine_is_compatible("lantiq,vr9")) {
-		struct resource res_xbar;
-		struct device_node *np_xbar =
-				of_find_compatible_node(NULL, NULL,
-							"lantiq,xbar-xway");
-
-		if (!np_xbar)
-			panic("Failed to load xbar nodes from devicetree");
-		if (of_address_to_resource(np_xbar, 0, &res_xbar))
-			panic("Failed to get xbar resources");
-		if (!request_mem_region(res_xbar.start, resource_size(&res_xbar),
-			res_xbar.name))
-			panic("Failed to get xbar resources");
-
-		ltq_xbar_membase = ioremap_nocache(res_xbar.start,
-						   resource_size(&res_xbar));
-		if (!ltq_xbar_membase)
-			panic("Failed to remap xbar resources");
-	}
-
 	/* make sure to unprotect the memory region where flash is located */
 	ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_BUSCON0) & ~EBU_WRDIS, LTQ_EBU_BUSCON0);
 
@@ -605,7 +567,4 @@ void __init ltq_soc_init(void)
 		clkdev_add_pmu("1e116000.mei", "dfe", 1, 0, PMU_DFE);
 		clkdev_add_pmu("1e100400.serial", NULL, 1, 0, PMU_ASC0);
 	}
-
-	if (of_machine_is_compatible("lantiq,vr9"))
-		xbar_fpi_burst_disable();
 }