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Message-ID: <b0438a630811110019m7f91fde5k4ba9aedc2c5af116@mail.gmail.com>
Date: Tue, 11 Nov 2008 09:19:10 +0100
From: "Miguel Ángel Álvarez" <gotzoncabanes@...il.com>
To: linux-arm-kernel@...ts.arm.linux.org.uk,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] ixp4xx: SSP
Hi.
With this patch I try to show the similarities between the SSP
subsystem in a PXA250 and an IXP4XX. The only difference is the lack
of the capability of using DMA for the SSP.
This patch should not be applied as it is... These files are places
insive arch/arm/mach-pxa2xx, so another question is where is it better
to place the files. (Inside arch/arm/common? inside drivers/spi?). Is
there a better way to solve the "#ifdef ARCH_PXA" I have added?
I would appreciate your comments very much.
---
diff -urN linux-2.6.27.4_clock/arch/arm/mach-pxa/include/mach/regs-ssp.h
linux-2.6.27.4_ssp/arch/arm/mach-pxa/include/mach/regs-ssp.h
--- linux-2.6.27.4_clock/arch/arm/mach-pxa/include/mach/regs-ssp.h 2008-11-10
13:07:31.000000000 +0100
+++ linux-2.6.27.4_ssp/arch/arm/mach-pxa/include/mach/regs-ssp.h 2008-11-11
09:13:25.000000000 +0100
@@ -34,7 +34,7 @@
#define SSCR0_ECS (1 << 6) /* External clock select */
#define SSCR0_SSE (1 << 7) /* Synchronous Serial Port Enable */
-#if defined(CONFIG_PXA25x)
+#if defined(CONFIG_PXA25x) || defined(CONFIG_ARCH_IXP4XX)
#define SSCR0_SCR (0x0000ff00) /* Serial Clock Rate (mask) */
#define SSCR0_SerClkDiv(x) ((((x) - 2)/2) << 8) /* Divisor [2..512] */
diff -urN linux-2.6.27.4_clock/arch/arm/mach-pxa/include/mach/ssp.h
linux-2.6.27.4_ssp/arch/arm/mach-pxa/include/mach/ssp.h
--- linux-2.6.27.4_clock/arch/arm/mach-pxa/include/mach/ssp.h 2008-11-10
13:07:31.000000000 +0100
+++ linux-2.6.27.4_ssp/arch/arm/mach-pxa/include/mach/ssp.h 2008-11-11
09:12:53.000000000 +0100
@@ -9,6 +9,7 @@
*
* This driver supports the following PXA CPU/SSP ports:-
*
+ * IXP4XX SSP
* PXA250 SSP
* PXA255 SSP, NSSP
* PXA26x SSP, NSSP, ASSP
@@ -23,7 +24,7 @@
enum pxa_ssp_type {
SSP_UNDEFINED = 0,
- PXA25x_SSP, /* pxa 210, 250, 255, 26x */
+ PXA25x_SSP, /* pxa 210, 250, 255, 26x, ixp4xx */
PXA25x_NSSP, /* pxa 255, 26x (including ASSP) */
PXA27x_SSP,
};
diff -urN linux-2.6.27.4_clock/arch/arm/mach-pxa/ssp.c
linux-2.6.27.4_ssp/arch/arm/mach-pxa/ssp.c
--- linux-2.6.27.4_clock/arch/arm/mach-pxa/ssp.c 2008-11-10
13:07:31.000000000 +0100
+++ linux-2.6.27.4_ssp/arch/arm/mach-pxa/ssp.c 2008-11-11
09:10:38.000000000 +0100
@@ -33,7 +33,6 @@
#include <asm/irq.h>
#include <mach/hardware.h>
#include <mach/ssp.h>
-#include <mach/pxa-regs.h>
#include <mach/regs-ssp.h>
#define TIMEOUT 100000
@@ -131,6 +130,7 @@
struct ssp_device *ssp = dev->ssp;
int timeout = TIMEOUT * 2;
+#ifdef ARCH_PXA
/* ensure TX FIFO is empty instead of not full */
if (cpu_is_pxa3xx()) {
while (__raw_readl(ssp->mmio_base + SSSR) & 0xf00) {
@@ -140,6 +140,7 @@
}
timeout = TIMEOUT * 2;
}
+#endif
do {
while (__raw_readl(ssp->mmio_base + SSSR) & SSSR_RNE) {
@@ -393,6 +394,7 @@
goto err_free_io;
}
+#ifdef ARCH_PXA
res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (res == NULL) {
dev_err(&pdev->dev, "no SSP RX DRCMR defined\n");
@@ -408,6 +410,7 @@
goto err_free_io;
}
ssp->drcmr_tx = res->start;
+#endif
/* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id
* starts from 0, do a translation here
Thanks
Miguel Ángel
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