[PATCH v5 0/3] add CNS3xxx AHCI support

[PATCH v5 0/3] add CNS3xxx AHCI support

[mkl0301 at gmail.com]

From: Mac Lin <mkl0301@gmail.com>

v5:
 - Rename ahci_platforms.h to ahci_platform.h
 - s/pltfm/platform/ in ahci_platform.c

v4: http://www.spinics.net/lists/linux-ide/msg39852.html
 - v2 basically, which make SoC-specific changes into separate files
 - Rename module ahci_platform to ahci_platforms, into which link the ahci_platform and the SoC-specific changes
 - No rename of ahci_platform.c
 - Some cosmetic code changes since v2

v3: http://www.spinics.net/lists/arm-kernel/msg109924.html
 - Make the SoC-specific changes into ahci_platform.c directly.
 - Some cosmetic code changes
=> ahci_platform.c is less readable due to SoC-specific changes and macro

v2: http://www.spinics.net/lists/linux-ide/msg39766.html
 - Renaming ahci_platform.c to ahci_pltfm.c for linking SoC specific changes into ahci_platform, while not changing the module name.
 - Switch ahci_platform to module device table matching to add SoC specific support
 - Add CNS3xxx SoC specific AHCI support to ahci_cns3xxx.c

v1: http://www.spinics.net/lists/arm-kernel/msg106236.html
 - Add CNS3xxx SoC specific AHCI support to arch/arm/mach-cns3xxx
=> The changes depends on libahci and libata, i.e. both of them need to be built into kernel

This patchset is based on linux-2.6.37

[PATCH v5 1/3] ahci_platform: rename module ahci_platform to ahci_platforms

[mkl0301 at gmail.com]

From: Mac Lin <mkl0301@gmail.com>

Due to build system limitations, intermediate and final objects can't have the
same names. And as we're going to start building SoC-specific objects, rename
ahci_platform to ahci_platforms, into which link ahci_platform and SoC-specific
objects.

Signed-off-by: Mac Lin <mkl0301@gmail.com>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
---
 drivers/ata/Makefile |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 2b67c90..d17bfe7 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -3,7 +3,9 @@ obj-$(CONFIG_ATA)		+= libata.o
 
 # non-SFF interface
 obj-$(CONFIG_SATA_AHCI)		+= ahci.o libahci.o
-obj-$(CONFIG_SATA_AHCI_PLATFORM) += ahci_platform.o libahci.o
+obj-$(CONFIG_SATA_AHCI_PLATFORM) += ahci_platforms.o libahci.o
+ahci_platforms-y		+= ahci_platform.o
+
 obj-$(CONFIG_SATA_FSL)		+= sata_fsl.o
 obj-$(CONFIG_SATA_INIC162X)	+= sata_inic162x.o
 obj-$(CONFIG_SATA_SIL24)	+= sata_sil24.o
-- 
1.7.3

[PATCH v5 2/3] ahci_platform: switch to module device table matching

[mkl0301 at gmail.com]

From: Mac Lin <mkl0301@gmail.com>

Switch the driver to use module device table matching mechanism to add SoC-specific parts to the generic driver.

Signed-off-by: Mac Lin <mkl0301@gmail.com>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
---
 drivers/ata/ahci_platform.c |   14 +++++++++++++-
 drivers/ata/ahci_platform.h |   16 ++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletions(-)
 create mode 100644 drivers/ata/ahci_platform.h

diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 6fef1fa..f0e2569 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -19,9 +19,11 @@
 #include <linux/interrupt.h>
 #include <linux/device.h>
 #include <linux/platform_device.h>
+#include <linux/mod_devicetable.h>
 #include <linux/libata.h>
 #include <linux/ahci_platform.h>
 #include "ahci.h"
+#include "ahci_platform.h"
 
 static struct scsi_host_template ahci_platform_sht = {
 	AHCI_SHT("ahci_platform"),
@@ -29,6 +31,7 @@ static struct scsi_host_template ahci_platform_sht = {
 
 static int __init ahci_probe(struct platform_device *pdev)
 {
+	const struct platform_device_id *platid = platform_get_device_id(pdev);
 	struct device *dev = &pdev->dev;
 	struct ahci_platform_data *pdata = dev->platform_data;
 	struct ata_port_info pi = {
@@ -46,6 +49,9 @@ static int __init ahci_probe(struct platform_device *pdev)
 	int i;
 	int rc;
 
+	if (!pdata && platid && platid->driver_data)
+		pdata = (void *)platid->driver_data;
+
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem) {
 		dev_err(dev, "no mmio space\n");
@@ -171,12 +177,19 @@ static int __devexit ahci_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct platform_device_id ahci_platform_ids[] = {
+	{ "ahci", },
+	{ },
+};
+MODULE_DEVICE_TABLE(platform, ahci_platform_ids);
+
 static struct platform_driver ahci_driver = {
 	.remove = __devexit_p(ahci_remove),
 	.driver = {
 		.name = "ahci",
 		.owner = THIS_MODULE,
 	},
+	.id_table	= ahci_platform_ids,
 };
 
 static int __init ahci_init(void)
@@ -194,4 +207,3 @@ module_exit(ahci_exit);
 MODULE_DESCRIPTION("AHCI SATA platform driver");
 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:ahci");
diff --git a/drivers/ata/ahci_platform.h b/drivers/ata/ahci_platform.h
new file mode 100644
index 0000000..cf16e6f
--- /dev/null
+++ b/drivers/ata/ahci_platform.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright 2010 MontaVista Software, LLC.
+ * Copyright 2010 Cavium Networks
+ *
+ * Authors: Anton Vorontsov <avorontsov@mvista.com>
+ *	    Mac Lin <mkl0301@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _DRIVERS_SATA_AHCI_PLATFORMS_H
+#define _DRIVERS_SATA_AHCI_PLATFORMS_H
+
+#endif /*_DRIVERS_SATA_AHCI_PLATFORMS_H*/
-- 
1.7.3

[PATCH v5 3/3] ahci_platforms: add support for CNS3xxx SoC devices

[mkl0301 at gmail.com]

From: Mac Lin <mkl0301@gmail.com>

CNS3xxx override the softreset function of ahci_platform ahci_softreset by
cns3xxx_ahci_softreset, which would retry ahci_do_softreset again with pmp=0 if
pmp=15 failed, for the controller has problem receiving D2H Reg FIS of the
different PMP setting of the previous sent H2D Reg FIS.

Following describe the isssue with original ahci_platform driver on
linux-2.6.37-rc3, arm/cns3xxx.

If CONFIG_SATA_PMP is enabled, while not using multiplier and connect the disks
directly to the board, the disk cannot be found due to software reset always
failed.

    ahci ahci.0: forcing PORTS_IMPL to 0x3
    ahci ahci.0: AHCI 0001.0100 32 slots 2 ports 3 Gbps 0x3 impl platform mode
    ahci ahci.0: flags: ncq sntf pm led clo only pmp pio slum part ccc
    scsi0 : ahci_platform
    scsi1 : ahci_platform
    ata1: SATA max UDMA/133 irq_stat 0x00400040, connection status changed irq 65
    ata2: SATA max UDMA/133 mmio [mem 0x83000000-0x83ffffff] port 0x180 irq 65
    ata2: SATA link down (SStatus 0 SControl 300)
    ata1: link is slow to respond, please be patient (ready=0)
    ata1: softreset failed (device not ready)
    ata1: link is slow to respond, please be patient (ready=0)
    ata1: softreset failed (device not ready)
    ata1: link is slow to respond, please be patient (ready=0)
    ata1: softreset failed (device not ready)
    ata1: limiting SATA link speed to 1.5 Gbps
    ata1: SATA link down (SStatus 1 SControl 310)

While using multiplier with CONFIG_SATA_PMP enabled, or using disks directly
without CONFIG_SATA_PMP have no issue. It seems the device is sending D2H Reg
FIS, but controller is not reflecting it on any known means.

Signed-off-by: Mac Lin <mkl0301@gmail.com>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
---
 arch/arm/mach-cns3xxx/devices.c |    2 +-
 drivers/ata/Kconfig             |   11 ++++++++
 drivers/ata/Makefile            |    1 +
 drivers/ata/ahci_cns3xxx.c      |   51 +++++++++++++++++++++++++++++++++++++++
 drivers/ata/ahci_platform.c     |    3 ++
 drivers/ata/ahci_platform.h     |    2 +
 6 files changed, 69 insertions(+), 1 deletions(-)
 create mode 100644 drivers/ata/ahci_cns3xxx.c

diff --git a/arch/arm/mach-cns3xxx/devices.c b/arch/arm/mach-cns3xxx/devices.c
index 50b4d31..b496f02 100644
--- a/arch/arm/mach-cns3xxx/devices.c
+++ b/arch/arm/mach-cns3xxx/devices.c
@@ -40,7 +40,7 @@ static struct resource cns3xxx_ahci_resource[] = {
 static u64 cns3xxx_ahci_dmamask = DMA_BIT_MASK(32);
 
 static struct platform_device cns3xxx_ahci_pdev = {
-	.name		= "ahci",
+	.name		= "ahci-cns3xxx",
 	.id		= 0,
 	.resource	= cns3xxx_ahci_resource,
 	.num_resources	= ARRAY_SIZE(cns3xxx_ahci_resource),
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 36e2319..5d8b1a3 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -75,6 +75,17 @@ config SATA_AHCI_PLATFORM
 
 	  If unsure, say N.
 
+config SATA_AHCI_CNS3XXX
+	bool "AHCI Support on the Cavium Networks CNS3xxx SOC"
+	depends on ARCH_CNS3XXX
+	depends on SATA_AHCI_PLATFORM
+	help
+	  This option enables AHCI platform driver to support CNS3xxx
+	  System-on-Chip devices. This is only needed when using CNS3xxx AHCI
+	  controller.
+
+	  If unsure, say N.
+
 config SATA_FSL
 	tristate "Freescale 3.0Gbps SATA support"
 	depends on FSL_SOC
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index d17bfe7..7f2d32e 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_ATA)		+= libata.o
 obj-$(CONFIG_SATA_AHCI)		+= ahci.o libahci.o
 obj-$(CONFIG_SATA_AHCI_PLATFORM) += ahci_platforms.o libahci.o
 ahci_platforms-y		+= ahci_platform.o
+ahci_platforms-$(CONFIG_SATA_AHCI_CNS3XXX) += ahci_cns3xxx.o
 
 obj-$(CONFIG_SATA_FSL)		+= sata_fsl.o
 obj-$(CONFIG_SATA_INIC162X)	+= sata_inic162x.o
diff --git a/drivers/ata/ahci_cns3xxx.c b/drivers/ata/ahci_cns3xxx.c
new file mode 100644
index 0000000..7cc841e
--- /dev/null
+++ b/drivers/ata/ahci_cns3xxx.c
@@ -0,0 +1,51 @@
+/*
+ * AHCI support for CNS3xxx SoC
+ *
+ * Copyright 2010 MontaVista Software, LLC.
+ * Copyright 2010 Cavium Networks
+ *
+ * Authors: Anton Vorontsov <avorontsov@mvista.com>
+ *	    Mac Lin <mkl0301@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/libata.h>
+#include <linux/ahci_platform.h>
+#include "ahci.h"
+
+/*
+ * TODO: move cns3xxx_ahci_init to here after cns3xxx_pwr*() calls are
+ * thread-safe
+ */
+
+static int cns3xxx_ahci_softreset(struct ata_link *link, unsigned int *class,
+			  unsigned long deadline)
+{
+	int pmp = sata_srst_pmp(link);
+	int ret;
+
+	ret = ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
+	if (pmp && ret)
+		return ahci_do_softreset(link, class, 0, deadline,
+			ahci_check_ready);
+	return ret;
+}
+
+static struct ata_port_operations cns3xxx_ahci_ops = {
+	.inherits		= &ahci_ops,
+	.softreset		= cns3xxx_ahci_softreset,
+};
+
+static const struct ata_port_info cns3xxx_ata_port_info = {
+	.flags		= AHCI_FLAG_COMMON,
+	.pio_mask	= ATA_PIO4,
+	.udma_mask	= ATA_UDMA6,
+	.port_ops	= &cns3xxx_ahci_ops,
+};
+
+struct ahci_platform_data cns3xxx_ahci_platform_data = {
+	.ata_port_info	= &cns3xxx_ata_port_info,
+};
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index f0e2569..35ddae1 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -179,6 +179,9 @@ static int __devexit ahci_remove(struct platform_device *pdev)
 
 static const struct platform_device_id ahci_platform_ids[] = {
 	{ "ahci", },
+#ifdef CONFIG_SATA_AHCI_CNS3XXX
+	{ "ahci-cns3xxx", (kernel_ulong_t)&cns3xxx_ahci_platform_data},
+#endif
 	{ },
 };
 MODULE_DEVICE_TABLE(platform, ahci_platform_ids);
diff --git a/drivers/ata/ahci_platform.h b/drivers/ata/ahci_platform.h
index cf16e6f..d9ea5ab 100644
--- a/drivers/ata/ahci_platform.h
+++ b/drivers/ata/ahci_platform.h
@@ -13,4 +13,6 @@
 #ifndef _DRIVERS_SATA_AHCI_PLATFORMS_H
 #define _DRIVERS_SATA_AHCI_PLATFORMS_H
 
+extern struct ahci_platform_data cns3xxx_ahci_platform_data;
+
 #endif /*_DRIVERS_SATA_AHCI_PLATFORMS_H*/
-- 
1.7.3

[PATCH v5 3/3] ahci_platforms: add support for CNS3xxx SoC devices

[Basheer, Mansoor Ahamed]

> From: Mac Lin <mkl0301@gmail.com>
> 
> CNS3xxx override the softreset function of ahci_platform
> ahci_softreset by cns3xxx_ahci_softreset, which would retry
> ahci_do_softreset again with pmp=0 if
> pmp=15 failed, for the controller has problem receiving D2H
> Reg FIS of the different PMP setting of the previous sent H2D Reg FIS.
> 

Is this issue only with your ahci platform controller? I came across another 
thread here,

http://www.spinics.net/lists/linux-ide/msg39865.html  

Also, the ahci platform controller on Texas Instruments OMAP L138 platform 
behaves in a similar fashion. 

Currently I see only Cavium Networks, Faraday and TI using ahci platform 
controller and all 3 facing same issue.

Hence, should we fix this in ahci_platform.c conditionally using platform data, 
otherwise we will end-up adding file for every platform (just for one 
function). 

Thanks
Mansoor Ahamed

[PATCH v5 3/3] ahci_platforms: add support for CNS3xxx SoC devices

[Lin Mac]

2011/1/10 Basheer, Mansoor Ahamed <mansoor.ahamed@ti.com>:
>> From: Mac Lin <mkl0301@gmail.com>
>>
>> CNS3xxx override the softreset function of ahci_platform
>> ahci_softreset by cns3xxx_ahci_softreset, which would retry
>> ahci_do_softreset again with pmp=0 if
>> pmp=15 failed, for the controller has problem receiving D2H
>> Reg FIS of the different PMP setting of the previous sent H2D Reg FIS.
>>
>
> Is this issue only with your ahci platform controller? I came across another
> thread here,
>
> http://www.spinics.net/lists/linux-ide/msg39865.html
Thanks for mentioning this.
They do look alike. I'll confirm with them.

> Also, the ahci platform controller on Texas Instruments OMAP L138 platform
> behaves in a similar fashion.
>
> Currently I see only Cavium Networks, Faraday and TI using ahci platform
> controller and all 3 facing same issue.
>
> Hence, should we fix this in ahci_platform.c conditionally using platform data,
> otherwise we will end-up adding file for every platform (just for one
> function).
We can add quirk in ahci platform data, just like sdhci_pltfm.c and
sdhci_cns3xxx.c.
Thus, in cns3xxx's case, all we need is to include
<linux/ahci_platform.h>, and all the SoC specific code could exist in
arch folder, similar to my v1 patchset.

Best Regards,
Mac Lin
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[PATCH v5 0/3] add CNS3xxx AHCI support

[Lin Mac]

2011/1/9  <mkl0301@gmail.com>:
> From: Mac Lin <mkl0301@gmail.com>
>
> v5:
> ?- Rename ahci_platforms.h to ahci_platform.h
> ?- s/pltfm/platform/ in ahci_platform.c
>
> v4: http://www.spinics.net/lists/linux-ide/msg39852.html
> ?- v2 basically, which make SoC-specific changes into separate files
> ?- Rename module ahci_platform to ahci_platforms, into which link the ahci_platform and the SoC-specific changes
> ?- No rename of ahci_platform.c
> ?- Some cosmetic code changes since v2
>
> v3: http://www.spinics.net/lists/arm-kernel/msg109924.html
> ?- Make the SoC-specific changes into ahci_platform.c directly.
> ?- Some cosmetic code changes
> => ahci_platform.c is less readable due to SoC-specific changes and macro
>
> v2: http://www.spinics.net/lists/linux-ide/msg39766.html
> ?- Renaming ahci_platform.c to ahci_pltfm.c for linking SoC specific changes into ahci_platform, while not changing the module name.
> ?- Switch ahci_platform to module device table matching to add SoC specific support
> ?- Add CNS3xxx SoC specific AHCI support to ahci_cns3xxx.c
>
> v1: http://www.spinics.net/lists/arm-kernel/msg106236.html
> ?- Add CNS3xxx SoC specific AHCI support to arch/arm/mach-cns3xxx
> => The changes depends on libahci and libata, i.e. both of them need to be built into kernel
>
> This patchset is based on linux-2.6.37
>

ping?
Please kindly provide your opinion.

Best Regards,
Mac Lin