[PATCH] ARM: pxa/sa1100: move I/O space to PCI_IOBASE
From: Arnd Bergmann
Date: Thu Apr 28 2022 - 09:11:38 EST
From: Arnd Bergmann <arnd@xxxxxxxx>
PXA and StrongARM1100 traditionally map their I/O space 1:1 into virtual
memory, using a per-bus io_offset that matches the base address of the
ioremap mapping.
In order for PXA to work in a multiplatform config, this needs to
change so I/O space starts at PCI_IOBASE (0xfee00000). Since the pcmcia
soc_common support is shared with StrongARM1100, both have to change at
the same time. The affected machines are:
- Anything with a PCMCIA slot now uses pci_remap_iospace, which
is made available to PCMCIA configurations as well, rather than
just PCI
- The Zeus and Viper platforms have PC/104-style ISA buses,
which have a static mapping for both I/O and memory space at
0xf1000000, which can no longer work. It does not appear to have
any in-tree users, so moving it to port number 0x2000 is unlikely to
break something.
- SA1100 does support ISA slots in theory, but all machines that
originally enabled this appear to have been removed from the tree
ages ago, and the I/O space is never mapped anywhere.
- The Nanoengine machine has support for PCI slots, but looks
like this never included I/O space, the resources only define the
location for memory and config space.
With this, the definitions of __io() and IO_SPACE_LIMIT can be simplified,
as the only remaining cases are the generic PCI_IOBASE and the custom
inb()/outb() macros on RiscPC. S3C24xx still has a custom inb()/outb()
in this here, but this is already removed in another branch.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
arch/arm/include/asm/io.h | 25 +++----------------------
arch/arm/mach-pxa/viper.c | 12 ++++++++++++
arch/arm/mach-pxa/zeus.c | 12 ++++++++++++
arch/arm/mm/ioremap.c | 2 +-
drivers/pcmcia/soc_common.c | 16 ++++++++--------
include/pcmcia/soc_common.h | 2 +-
6 files changed, 37 insertions(+), 32 deletions(-)
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 0c70eb688a00..3bdc54702baa 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -200,32 +200,13 @@ void __iomem *pci_remap_cfgspace(resource_size_t res_cookie, size_t size);
*/
#ifdef CONFIG_NEED_MACH_IO_H
#include <mach/io.h>
-#elif defined(CONFIG_PCI)
-#define IO_SPACE_LIMIT ((resource_size_t)0xfffff)
-#define __io(a) __typesafe_io(PCI_IO_VIRT_BASE + ((a) & IO_SPACE_LIMIT))
#else
-#define __io(a) __typesafe_io((a) & IO_SPACE_LIMIT)
-#endif
-
-/*
- * This is the limit of PC card/PCI/ISA IO space, which is by default
- * 64K if we have PC card, PCI or ISA support. Otherwise, default to
- * zero to prevent ISA/PCI drivers claiming IO space (and potentially
- * oopsing.)
- *
- * Only set this larger if you really need inb() et.al. to operate over
- * a larger address space. Note that SOC_COMMON ioremaps each sockets
- * IO space area, and so inb() et.al. must be defined to operate as per
- * readb() et.al. on such platforms.
- */
-#ifndef IO_SPACE_LIMIT
-#if defined(CONFIG_PCMCIA_SOC_COMMON) || defined(CONFIG_PCMCIA_SOC_COMMON_MODULE)
-#define IO_SPACE_LIMIT ((resource_size_t)0xffffffff)
-#elif defined(CONFIG_PCI) || defined(CONFIG_ISA) || defined(CONFIG_PCCARD)
-#define IO_SPACE_LIMIT ((resource_size_t)0xffff)
+#if defined(CONFIG_PCMCIA) || defined(CONFIG_PCI)
+#define IO_SPACE_LIMIT ((resource_size_t)0xfffff)
#else
#define IO_SPACE_LIMIT ((resource_size_t)0)
#endif
+#define __io(a) __typesafe_io(PCI_IO_VIRT_BASE + ((a) & IO_SPACE_LIMIT))
#endif
/*
diff --git a/arch/arm/mach-pxa/viper.c b/arch/arm/mach-pxa/viper.c
index 0782f0ed5a6e..71e4d7ea77b8 100644
--- a/arch/arm/mach-pxa/viper.c
+++ b/arch/arm/mach-pxa/viper.c
@@ -998,6 +998,18 @@ static struct map_desc viper_io_desc[] __initdata = {
.length = 0x00800000,
.type = MT_DEVICE,
},
+ {
+ /*
+ * ISA I/O space mapping:
+ * - ports 0x0000-0x0fff are PCMCIA slot 0
+ * - ports 0x1000-0x1fff are PCMCIA slot 1
+ * - ports 0x2000-0x2fff are PC/104
+ */
+ .virtual = PCI_IOBASE + 0x2000,
+ .pfn = __phys_to_pfn(0x30000000),
+ .length = 0x1000,
+ .type = MT_DEVICE,
+ },
};
static void __init viper_map_io(void)
diff --git a/arch/arm/mach-pxa/zeus.c b/arch/arm/mach-pxa/zeus.c
index 1fdef9426784..5ddb4223d1dc 100644
--- a/arch/arm/mach-pxa/zeus.c
+++ b/arch/arm/mach-pxa/zeus.c
@@ -929,6 +929,18 @@ static struct map_desc zeus_io_desc[] __initdata = {
.length = 0x00800000,
.type = MT_DEVICE,
},
+ {
+ /*
+ * ISA I/O space mapping:
+ * - ports 0x0000-0x0fff are PCMCIA slot 0
+ * - ports 0x1000-0x1fff are PCMCIA slot 1
+ * - ports 0x2000-0x2fff are PC/104
+ */
+ .virtual = PCI_IOBASE + 0x2000,
+ .pfn = __phys_to_pfn(ZEUS_PC104IO_PHYS),
+ .length = 0x1000,
+ .type = MT_DEVICE,
+ },
};
static void __init zeus_map_io(void)
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index aa08bcb72db9..e6f5354ed1d7 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -455,7 +455,7 @@ void iounmap(volatile void __iomem *cookie)
}
EXPORT_SYMBOL(iounmap);
-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) || defined(CONFIG_PCMCIA)
static int pci_ioremap_mem_type = MT_DEVICE;
void pci_ioremap_set_mem_type(int mem_type)
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index 9276a628473d..fdeaefffd34a 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -46,6 +46,7 @@
#include <linux/regulator/consumer.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
+#include <linux/pci.h>
#include "soc_common.h"
@@ -782,8 +783,7 @@ void soc_pcmcia_remove_one(struct soc_pcmcia_socket *skt)
/* should not be required; violates some lowlevel drivers */
soc_common_pcmcia_config_skt(skt, &dead_socket);
- iounmap(skt->virt_io);
- skt->virt_io = NULL;
+ pci_unmap_iospace(&skt->res_io_io);
release_resource(&skt->res_attr);
release_resource(&skt->res_mem);
release_resource(&skt->res_io);
@@ -816,11 +816,11 @@ int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt)
if (ret)
goto out_err_4;
- skt->virt_io = ioremap(skt->res_io.start, 0x10000);
- if (skt->virt_io == NULL) {
- ret = -ENOMEM;
+ skt->res_io_io = (struct resource)
+ DEFINE_RES_IO_NAMED(skt->nr * 0x1000, 0x1000, "PCMCIA I/O");
+ ret = pci_remap_iospace(&skt->res_io_io, skt->res_io.start);
+ if (ret)
goto out_err_5;
- }
/*
* We initialize default socket timing here, because
@@ -838,7 +838,7 @@ int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt)
skt->socket.resource_ops = &pccard_static_ops;
skt->socket.irq_mask = 0;
skt->socket.map_size = PAGE_SIZE;
- skt->socket.io_offset = (unsigned long)skt->virt_io;
+ skt->socket.io_offset = (unsigned long)skt->res_io_io.start;
skt->status = soc_common_pcmcia_skt_state(skt);
@@ -872,7 +872,7 @@ int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt)
out_err_7:
soc_pcmcia_hw_shutdown(skt);
out_err_6:
- iounmap(skt->virt_io);
+ pci_unmap_iospace(&skt->res_io_io);
out_err_5:
release_resource(&skt->res_attr);
out_err_4:
diff --git a/include/pcmcia/soc_common.h b/include/pcmcia/soc_common.h
index 26f1473a06c5..d4f18f4679df 100644
--- a/include/pcmcia/soc_common.h
+++ b/include/pcmcia/soc_common.h
@@ -46,9 +46,9 @@ struct soc_pcmcia_socket {
struct resource res_skt;
struct resource res_io;
+ struct resource res_io_io;
struct resource res_mem;
struct resource res_attr;
- void __iomem *virt_io;
struct {
int gpio;
--
2.29.2