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Date: Tue, 28 Jun 2011 17:36:03 +0200
From: Manuel Lauss <manuel.lauss@...glemail.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org,
Alan Cox <alan@...rguk.ukuu.org.uk>,
Ralf Baechle <ralf@...ux-mips.org>,
linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/7] serial/8250: move alchemy I/O handler to platform code
On Tue, Jun 28, 2011 at 1:29 PM, Manuel Lauss
<manuel.lauss@...glemail.com> wrote:
> On Mon, Jun 27, 2011 at 11:45 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> Only one platform ever sets the UPIO_AU iotype, so it's
>> cleaner to define the handlers in the code that actually
>> requires it, rather than building the same logic into
>> every 8250 driver.
>>
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> Cc: Ralf Baechle <ralf@...ux-mips.org>
>> Cc: Manuel Lauss <manuel.lauss@...glemail.com>
>> Cc: Greg Kroah-Hartman <gregkh@...e.de>
>> Cc: linux-serial@...r.kernel.org
>> ---
>> arch/mips/alchemy/common/platform.c | 50 ++++++++++++++++++++++++++++++
>> drivers/tty/serial/8250.c | 58 -----------------------------------
>> 2 files changed, 50 insertions(+), 58 deletions(-)
>>
>> diff --git a/arch/mips/alchemy/common/platform.c b/arch/mips/alchemy/common/platform.c
>> index 3b2c18b..750441f 100644
>> --- a/arch/mips/alchemy/common/platform.c
>> +++ b/arch/mips/alchemy/common/platform.c
> [...]
>> @@ -55,6 +103,8 @@ static void alchemy_8250_pm(struct uart_port *port, unsigned int state,
>> UPF_FIXED_TYPE, \
>> .type = PORT_16550A, \
>> .pm = alchemy_8250_pm, \
>> + .serial_in = au_serial_in, \
>> + .serial_out = au_serial_out \
>> }
>
> This is very strange: Just this part alone (leaving 8250.c intact)
> screws everything up.
> The assembly for au_serial_in/out is identical in both 8250.o and
> arch/mips/alchemy/common/platform.o (renamed the functions here obviously)
> I have no idea what's wrong...
Okay, found it. the Alchemy headers have definitions for UART_RX/TX/... with
different values; they can be deleted safely since nothing depends on them.
Here's an updated and tested patch. I took the liberty to rename the functions
a bit while at it.
diff --git a/arch/mips/alchemy/common/platform.c
b/arch/mips/alchemy/common/platform.c
index 932f697..301ccb7 100644
--- a/arch/mips/alchemy/common/platform.c
+++ b/arch/mips/alchemy/common/platform.c
@@ -16,6 +16,7 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/serial_8250.h>
+#include <linux/serial_reg.h>
#include <linux/slab.h>
#include <asm/mach-au1x00/au1xxx.h>
@@ -45,6 +46,54 @@ static void alchemy_8250_pm(struct uart_port *port,
unsigned int state,
#endif
}
+/* Au1x00 UART hardware has a weird register layout */
+static const u8 alchemy_8250_inmap[] = {
+ [UART_RX] = 0,
+ [UART_IER] = 2,
+ [UART_IIR] = 3,
+ [UART_LCR] = 5,
+ [UART_MCR] = 6,
+ [UART_LSR] = 7,
+ [UART_MSR] = 8,
+};
+
+static const u8 alchemy_8250_outmap[] = {
+ [UART_TX] = 1,
+ [UART_IER] = 2,
+ [UART_FCR] = 4,
+ [UART_LCR] = 5,
+ [UART_MCR] = 6,
+};
+
+/* sane hardware needs no mapping */
+static inline int map_8250_in_reg(struct uart_port *p, int offset)
+{
+ if (p->iotype != UPIO_AU)
+ return offset;
+ return alchemy_8250_inmap[offset];
+}
+
+static inline int map_8250_out_reg(struct uart_port *p, int offset)
+{
+ if (p->iotype != UPIO_AU)
+ return offset;
+ return alchemy_8250_outmap[offset];
+}
+
+/* sane hardware needs no mapping */
+static unsigned int alchemy_8250_in(struct uart_port *p, int offset)
+{
+ offset = map_8250_in_reg(p, offset) << p->regshift;
+ return __raw_readl(p->membase + offset);
+}
+
+static void alchemy_8250_out(struct uart_port *p, int offset, int value)
+{
+ offset = map_8250_out_reg(p, offset) << p->regshift;
+ __raw_writel(value, p->membase + offset);
+}
+
+
#define PORT(_base, _irq) \
{ \
.mapbase = _base, \
@@ -55,6 +104,8 @@ static void alchemy_8250_pm(struct uart_port *port,
unsigned int state,
UPF_FIXED_TYPE, \
.type = PORT_16550A, \
.pm = alchemy_8250_pm, \
+ .serial_in = alchemy_8250_in, \
+ .serial_out = alchemy_8250_out, \
}
static struct plat_serial8250_port au1x00_uart_data[][4] __initdata = {
diff --git a/arch/mips/include/asm/mach-au1x00/au1000.h
b/arch/mips/include/asm/mach-au1x00/au1000.h
index 610cc06..666de8e 100644
--- a/arch/mips/include/asm/mach-au1x00/au1000.h
+++ b/arch/mips/include/asm/mach-au1x00/au1000.h
@@ -1172,18 +1172,6 @@ enum soc_au1200_ints {
#define MAC_RX_BUFF3_STATUS 0x30
#define MAC_RX_BUFF3_ADDR 0x34
-#define UART_RX 0 /* Receive buffer */
-#define UART_TX 4 /* Transmit buffer */
-#define UART_IER 8 /* Interrupt Enable Register */
-#define UART_IIR 0xC /* Interrupt ID Register */
-#define UART_FCR 0x10 /* FIFO Control Register */
-#define UART_LCR 0x14 /* Line Control Register */
-#define UART_MCR 0x18 /* Modem Control Register */
-#define UART_LSR 0x1C /* Line Status Register */
-#define UART_MSR 0x20 /* Modem Status Register */
-#define UART_CLK 0x28 /* Baud Rate Clock Divider */
-#define UART_MOD_CNTRL 0x100 /* Module Control */
-
/* SSIO */
#define SSI0_STATUS 0xB1600000
# define SSI_STATUS_BF (1 << 4)
diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
index cf19b26..c8f107e 100644
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -304,50 +304,9 @@ static const struct serial8250_config uart_config[] = {
},
};
-#if defined(CONFIG_MIPS_ALCHEMY)
-
-/* Au1x00 UART hardware has a weird register layout */
-static const u8 au_io_in_map[] = {
- [UART_RX] = 0,
- [UART_IER] = 2,
- [UART_IIR] = 3,
- [UART_LCR] = 5,
- [UART_MCR] = 6,
- [UART_LSR] = 7,
- [UART_MSR] = 8,
-};
-
-static const u8 au_io_out_map[] = {
- [UART_TX] = 1,
- [UART_IER] = 2,
- [UART_FCR] = 4,
- [UART_LCR] = 5,
- [UART_MCR] = 6,
-};
-
-/* sane hardware needs no mapping */
-static inline int map_8250_in_reg(struct uart_port *p, int offset)
-{
- if (p->iotype != UPIO_AU)
- return offset;
- return au_io_in_map[offset];
-}
-
-static inline int map_8250_out_reg(struct uart_port *p, int offset)
-{
- if (p->iotype != UPIO_AU)
- return offset;
- return au_io_out_map[offset];
-}
-
-#else
-
-/* sane hardware needs no mapping */
#define map_8250_in_reg(up, offset) (offset)
#define map_8250_out_reg(up, offset) (offset)
-#endif
-
static unsigned int hub6_serial_in(struct uart_port *p, int offset)
{
offset = map_8250_in_reg(p, offset) << p->regshift;
@@ -386,18 +345,6 @@ static unsigned int mem32_serial_in(struct
uart_port *p, int offset)
return readl(p->membase + offset);
}
-static unsigned int au_serial_in(struct uart_port *p, int offset)
-{
- offset = map_8250_in_reg(p, offset) << p->regshift;
- return __raw_readl(p->membase + offset);
-}
-
-static void au_serial_out(struct uart_port *p, int offset, int value)
-{
- offset = map_8250_out_reg(p, offset) << p->regshift;
- __raw_writel(value, p->membase + offset);
-}
-
static unsigned int tsi_serial_in(struct uart_port *p, int offset)
{
unsigned int tmp;
@@ -484,11 +431,6 @@ static void set_io_from_upio(struct uart_port *p)
p->serial_out = mem32_serial_out;
break;
- case UPIO_AU:
- p->serial_in = au_serial_in;
- p->serial_out = au_serial_out;
- break;
-
case UPIO_TSI:
p->serial_in = tsi_serial_in;
p->serial_out = tsi_serial_out;
--
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