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Subject[PATCH 2/5] MIPS: lantiq: use a generic "EBU" driver for Falcon and XWAY SoCs
Date
Both SoC types have the EBU registers and exposing the ltq_ebu_membase
in (the SoC-independent) arch/mips/include/asm/mach-lantiq/lantiq.h.
The only difference is the initialization logic: XWAY clears the WRDIS
(write disable) bit of the BUSCON0 register, while Falcon leaves it as
is.

Move the existing EBU logic from the Falcon and XWAY SoC types into a
generic driver.
This will make it easier to add the PCI irq controller which is provided
by EBU on at least the XWAY SoCs.

No functional changes intended.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
.../include/asm/mach-lantiq/xway/lantiq_soc.h | 2 -
arch/mips/lantiq/Makefile | 2 +-
arch/mips/lantiq/ebu.c | 89 +++++++++++++++++++
arch/mips/lantiq/falcon/sysctrl.c | 17 ++--
arch/mips/lantiq/xway/sysctrl.c | 21 ++---
5 files changed, 100 insertions(+), 31 deletions(-)
create mode 100644 arch/mips/lantiq/ebu.c

diff --git a/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h b/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
index 4790cfa190d6..02a64ad6c0cc 100644
--- a/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
+++ b/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
@@ -79,13 +79,11 @@ extern __iomem void *ltq_cgu_membase;
#define LTQ_EARLY_ASC KSEG1ADDR(LTQ_ASC1_BASE_ADDR)

/* EBU - external bus unit */
-#define LTQ_EBU_BUSCON0 0x0060
#define LTQ_EBU_PCC_CON 0x0090
#define LTQ_EBU_PCC_IEN 0x00A4
#define LTQ_EBU_PCC_ISTAT 0x00A0
#define LTQ_EBU_BUSCON1 0x0064
#define LTQ_EBU_ADDRSEL1 0x0024
-#define EBU_WRDIS 0x80000000

/* WDT */
#define LTQ_RST_CAUSE_WDTRST 0x20
diff --git a/arch/mips/lantiq/Makefile b/arch/mips/lantiq/Makefile
index e7234ca093b9..e92f62f02ec1 100644
--- a/arch/mips/lantiq/Makefile
+++ b/arch/mips/lantiq/Makefile
@@ -2,7 +2,7 @@
# Copyright (C) 2010 John Crispin <john@phrozen.org>
#

-obj-y := irq.o clk.o prom.o
+obj-y := irq.o clk.o ebu.o prom.o

obj-$(CONFIG_EARLY_PRINTK) += early_printk.o

diff --git a/arch/mips/lantiq/ebu.c b/arch/mips/lantiq/ebu.c
new file mode 100644
index 000000000000..b2e84cf83f91
--- /dev/null
+++ b/arch/mips/lantiq/ebu.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2019 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ * Copyright (C) 2011-2012 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/bits.h>
+#include <linux/export.h>
+#include <linux/ioport.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+
+#include <lantiq_soc.h>
+
+#define LTQ_EBU_BUSCON0 0x0060
+#define LTQ_EBU_BUSCON_WRDIS BIT(31)
+
+void __iomem *ltq_ebu_membase;
+
+struct ltq_ebu_data {
+ bool initialize_buscon0_wrdis;
+};
+
+static const struct ltq_ebu_data ltq_ebu_falcon_data = {
+ .initialize_buscon0_wrdis = false,
+};
+
+static const struct ltq_ebu_data ltq_ebu_xway_data = {
+ .initialize_buscon0_wrdis = true,
+};
+
+static const struct of_device_id of_ebu_ids[] __initconst = {
+ {
+ /* DEPRECATED */
+ .compatible = "lantiq,ebu-falcon",
+ .data = &ltq_ebu_falcon_data,
+ },
+ {
+ .compatible = "lantiq,falcon-ebu",
+ .data = &ltq_ebu_falcon_data,
+ },
+ {
+ /* DEPRECATED */
+ .compatible = "lantiq,ebu-xway",
+ .data = &ltq_ebu_xway_data,
+ },
+ {
+ .compatible = "lantiq,xway-ebu",
+ .data = &ltq_ebu_xway_data,
+ },
+ { /* sentinel */ },
+};
+
+static int __init ltq_ebu_setup(void)
+{
+ const struct ltq_ebu_data *ebu_data;
+ const struct of_device_id *match;
+ struct resource res_ebu;
+ struct device_node *np;
+ u32 val;
+
+ np = of_find_matching_node_and_match(NULL, of_ebu_ids, &match);
+ if (!np)
+ panic("Failed to load the EBU node from devicetree");
+
+ if (of_address_to_resource(np, 0, &res_ebu))
+ panic("Failed to get the EBU resources");
+
+ if ((request_mem_region(res_ebu.start, resource_size(&res_ebu),
+ res_ebu.name) < 0))
+ pr_err("Failed to request the EBU resources");
+
+ ltq_ebu_membase = ioremap_nocache(res_ebu.start,
+ resource_size(&res_ebu));
+ if (!ltq_ebu_membase)
+ panic("Failed to remap the EBU resources");
+
+ ebu_data = match->data;
+
+ if (ebu_data && ebu_data->initialize_buscon0_wrdis) {
+ val = ltq_ebu_r32(LTQ_EBU_BUSCON0) & ~LTQ_EBU_BUSCON_WRDIS;
+ ltq_ebu_w32(val, LTQ_EBU_BUSCON0);
+ }
+
+ return 0;
+}
+
+arch_initcall(ltq_ebu_setup);
diff --git a/arch/mips/lantiq/falcon/sysctrl.c b/arch/mips/lantiq/falcon/sysctrl.c
index 037b08f3257e..1637c6f1d8f3 100644
--- a/arch/mips/lantiq/falcon/sysctrl.c
+++ b/arch/mips/lantiq/falcon/sysctrl.c
@@ -70,7 +70,7 @@
#define status_r32(x) ltq_r32(status_membase + (x))

static void __iomem *sysctl_membase[3], *status_membase;
-void __iomem *ltq_sys1_membase, *ltq_ebu_membase;
+void __iomem *ltq_sys1_membase;

void falcon_trigger_hrst(int level)
{
@@ -184,23 +184,20 @@ void __init ltq_soc_init(void)
{
struct device_node *np_status =
of_find_compatible_node(NULL, NULL, "lantiq,status-falcon");
- struct device_node *np_ebu =
- of_find_compatible_node(NULL, NULL, "lantiq,ebu-falcon");
struct device_node *np_sys1 =
of_find_compatible_node(NULL, NULL, "lantiq,sys1-falcon");
struct device_node *np_syseth =
of_find_compatible_node(NULL, NULL, "lantiq,syseth-falcon");
struct device_node *np_sysgpe =
of_find_compatible_node(NULL, NULL, "lantiq,sysgpe-falcon");
- struct resource res_status, res_ebu, res_sys[3];
+ struct resource res_status, res_sys[3];
int i;

/* check if all the core register ranges are available */
- if (!np_status || !np_ebu || !np_sys1 || !np_syseth || !np_sysgpe)
+ if (!np_status || !np_sys1 || !np_syseth || !np_sysgpe)
panic("Failed to load core nodes from devicetree");

if (of_address_to_resource(np_status, 0, &res_status) ||
- of_address_to_resource(np_ebu, 0, &res_ebu) ||
of_address_to_resource(np_sys1, 0, &res_sys[0]) ||
of_address_to_resource(np_syseth, 0, &res_sys[1]) ||
of_address_to_resource(np_sysgpe, 0, &res_sys[2]))
@@ -208,8 +205,6 @@ void __init ltq_soc_init(void)

if ((request_mem_region(res_status.start, resource_size(&res_status),
res_status.name) < 0) ||
- (request_mem_region(res_ebu.start, resource_size(&res_ebu),
- res_ebu.name) < 0) ||
(request_mem_region(res_sys[0].start,
resource_size(&res_sys[0]),
res_sys[0].name) < 0) ||
@@ -223,11 +218,9 @@ void __init ltq_soc_init(void)

status_membase = ioremap_nocache(res_status.start,
resource_size(&res_status));
- ltq_ebu_membase = ioremap_nocache(res_ebu.start,
- resource_size(&res_ebu));

- if (!status_membase || !ltq_ebu_membase)
- panic("Failed to remap core resources");
+ if (!status_membase)
+ panic("Failed to remap status resource");

for (i = 0; i < 3; i++) {
sysctl_membase[i] = ioremap_nocache(res_sys[i].start,
diff --git a/arch/mips/lantiq/xway/sysctrl.c b/arch/mips/lantiq/xway/sysctrl.c
index 156a95ac5c72..ae3f35884036 100644
--- a/arch/mips/lantiq/xway/sysctrl.c
+++ b/arch/mips/lantiq/xway/sysctrl.c
@@ -145,7 +145,6 @@ static u32 pmu_clk_cr_b[] = {

static void __iomem *pmu_membase;
void __iomem *ltq_cgu_membase;
-void __iomem *ltq_ebu_membase;

static u32 ifccr = CGU_IFCCR;
static u32 pcicr = CGU_PCICR;
@@ -406,42 +405,32 @@ static void clkdev_add_clkout(void)
/* bring up all register ranges that we need for basic system control */
void __init ltq_soc_init(void)
{
- struct resource res_pmu, res_cgu, res_ebu;
+ struct resource res_pmu, res_cgu;
struct device_node *np_pmu =
of_find_compatible_node(NULL, NULL, "lantiq,pmu-xway");
struct device_node *np_cgu =
of_find_compatible_node(NULL, NULL, "lantiq,cgu-xway");
- struct device_node *np_ebu =
- of_find_compatible_node(NULL, NULL, "lantiq,ebu-xway");

/* check if all the core register ranges are available */
- if (!np_pmu || !np_cgu || !np_ebu)
+ if (!np_pmu || !np_cgu)
panic("Failed to load core nodes from devicetree");

if (of_address_to_resource(np_pmu, 0, &res_pmu) ||
- of_address_to_resource(np_cgu, 0, &res_cgu) ||
- of_address_to_resource(np_ebu, 0, &res_ebu))
+ of_address_to_resource(np_cgu, 0, &res_cgu))
panic("Failed to get core resources");

if (!request_mem_region(res_pmu.start, resource_size(&res_pmu),
res_pmu.name) ||
!request_mem_region(res_cgu.start, resource_size(&res_cgu),
- res_cgu.name) ||
- !request_mem_region(res_ebu.start, resource_size(&res_ebu),
- res_ebu.name))
+ res_cgu.name))
pr_err("Failed to request core resources");

pmu_membase = ioremap_nocache(res_pmu.start, resource_size(&res_pmu));
ltq_cgu_membase = ioremap_nocache(res_cgu.start,
resource_size(&res_cgu));
- ltq_ebu_membase = ioremap_nocache(res_ebu.start,
- resource_size(&res_ebu));
- if (!pmu_membase || !ltq_cgu_membase || !ltq_ebu_membase)
+ if (!pmu_membase || !ltq_cgu_membase)
panic("Failed to remap core 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);
-
/* add our generic xway clocks */
clkdev_add_pmu("10000000.fpi", NULL, 0, 0, PMU_FPI);
clkdev_add_pmu("1e100a00.gptu", NULL, 1, 0, PMU_GPT);
--
2.22.0
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