[PATCH V6 0/5] x86: a bridge from PCI to AMBA

[PATCH V6 0/5] x86: a bridge from PCI to AMBA

[Alessandro Rubini]

V6:

I also put in the acked-by we received on the mailing list and
were missing from tip::x86/amba.

V5:

This is a repost of patches I sent quite some time ago and are
available from the "tip" repository, as branch "x86/amba" based on
v3.7.  That branch includes 7 patches but two of them are already
upstream. Some of the other 5 had minor conflicts during rebase, but
only in the initial "#include" area.

I repost as Peter Anvin suggested. The commits in the tip
repository included both hpa's signed off (which I left in)
and the reference to the previous lkml message, which I removed
as it is not current by the time  this message exists.


Alessandro Rubini (5):
  DMA: PL330: use prefix in reg names to build under x86
  watchdog: sp805_wdt depends on ARM
  mmc: Use the new <linux/sizes.h>
  drivers/amba: add support for a PCI bridge
  x86: add CONFIG_ARM_AMBA, selected by STA2X11

 arch/x86/Kconfig            |    4 ++
 drivers/Kconfig             |    2 +
 drivers/amba/Kconfig        |   10 ++++
 drivers/amba/Makefile       |    1 +
 drivers/amba/pci-amba.c     |   93 +++++++++++++++++++++++++++++++++++++
 drivers/dma/pl330.c         |  107 ++++++++++++++++++++++---------------------
 drivers/mmc/host/mmci.c     |    2 +-
 drivers/mmc/host/msm_sdcc.c |    2 +-
 drivers/mmc/host/mvsdio.c   |    2 +-
 drivers/mmc/host/mxcmmc.c   |    2 +-
 drivers/mmc/host/pxamci.c   |    3 +-
 drivers/watchdog/Kconfig    |    2 +-
 12 files changed, 170 insertions(+), 60 deletions(-)
 create mode 100644 drivers/amba/Kconfig
 create mode 100644 drivers/amba/pci-amba.c

-- 
1.7.7.2

[PATCH V6 1/5] DMA: PL330: use prefix in reg names to build under x86

[Alessandro Rubini]

This driver would not compile if ARM_AMBA is selected under x86,
because "CS" and "DS" are already defined there.  But AMBA
is used in the x86 world by a PCI-to-AMBA bridge, to be submitted.

The patch just adds the "PL330_" prefix to all registers,
so it can be built by randomconfig after ARM_AMBA appears within x86.
No other technical changes have been performed.
The patch was build-tested only.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com>
Signed-off-by: Davide Ciminaghi <ciminaghi@gnudd.com>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---

@Jassi, Linus, Vinod: I repost this after rebasing, on hpa's suggestion.

Linus' ack: http://lkml.org/lkml/2012/9/16/93
Vinod's ack: http://lkml.org/lkml/2012/9/16/271

 drivers/dma/pl330.c |  107 ++++++++++++++++++++++++++-------------------------
 1 files changed, 54 insertions(+), 53 deletions(-)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 7181531..b45cbe0 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -70,7 +70,7 @@ enum pl330_reqtype {
 };
 
 /* Register and Bit field Definitions */
-#define DS			0x0
+#define PL330_DS		0x0
 #define DS_ST_STOP		0x0
 #define DS_ST_EXEC		0x1
 #define DS_ST_CMISS		0x2
@@ -84,33 +84,33 @@ enum pl330_reqtype {
 #define DS_ST_FLTCMP		0xe
 #define DS_ST_FAULT		0xf
 
-#define DPC			0x4
-#define INTEN			0x20
-#define ES			0x24
-#define INTSTATUS		0x28
-#define INTCLR			0x2c
-#define FSM			0x30
-#define FSC			0x34
-#define FTM			0x38
+#define PL330_DPC		0x4
+#define PL330_INTEN		0x20
+#define PL330_ES		0x24
+#define PL330_INTSTATUS		0x28
+#define PL330_INTCLR		0x2c
+#define PL330_FSM		0x30
+#define PL330_FSC		0x34
+#define PL330_FTM		0x38
 
 #define _FTC			0x40
-#define FTC(n)			(_FTC + (n)*0x4)
+#define PL330_FTC(n)		(_FTC + (n)*0x4)
 
 #define _CS			0x100
-#define CS(n)			(_CS + (n)*0x8)
+#define PL330_CS(n)		(_CS + (n)*0x8)
 #define CS_CNS			(1 << 21)
 
 #define _CPC			0x104
-#define CPC(n)			(_CPC + (n)*0x8)
+#define PL330_CPC(n)		(_CPC + (n)*0x8)
 
 #define _SA			0x400
-#define SA(n)			(_SA + (n)*0x20)
+#define PL330_SA(n)		(_SA + (n)*0x20)
 
 #define _DA			0x404
-#define DA(n)			(_DA + (n)*0x20)
+#define PL330_DA(n)		(_DA + (n)*0x20)
 
 #define _CC			0x408
-#define CC(n)			(_CC + (n)*0x20)
+#define PL330_CC(n)		(_CC + (n)*0x20)
 
 #define CC_SRCINC		(1 << 0)
 #define CC_DSTINC		(1 << 14)
@@ -131,24 +131,24 @@ enum pl330_reqtype {
 #define CC_SWAP_SHFT		28
 
 #define _LC0			0x40c
-#define LC0(n)			(_LC0 + (n)*0x20)
+#define PL330_LC0(n)		(_LC0 + (n)*0x20)
 
 #define _LC1			0x410
-#define LC1(n)			(_LC1 + (n)*0x20)
+#define PL330_LC1(n)		(_LC1 + (n)*0x20)
 
-#define DBGSTATUS		0xd00
+#define PL330_DBGSTATUS		0xd00
 #define DBG_BUSY		(1 << 0)
 
-#define DBGCMD			0xd04
-#define DBGINST0		0xd08
-#define DBGINST1		0xd0c
+#define PL330_DBGCMD		0xd04
+#define PL330_DBGINST0		0xd08
+#define PL330_DBGINST1		0xd0c
 
-#define CR0			0xe00
-#define CR1			0xe04
-#define CR2			0xe08
-#define CR3			0xe0c
-#define CR4			0xe10
-#define CRD			0xe14
+#define PL330_CR0		0xe00
+#define PL330_CR1		0xe04
+#define PL330_CR2		0xe08
+#define PL330_CR3		0xe0c
+#define PL330_CR4		0xe10
+#define PL330_CRD		0xe14
 
 #define PERIPH_ID		0xfe0
 #define PERIPH_REV_SHIFT	20
@@ -1022,7 +1022,7 @@ static bool _until_dmac_idle(struct pl330_thread *thrd)
 
 	do {
 		/* Until Manager is Idle */
-		if (!(readl(regs + DBGSTATUS) & DBG_BUSY))
+		if (!(readl(regs + PL330_DBGSTATUS) & DBG_BUSY))
 			break;
 
 		cpu_relax();
@@ -1045,10 +1045,10 @@ static inline void _execute_DBGINSN(struct pl330_thread *thrd,
 		val |= (1 << 0);
 		val |= (thrd->id << 8); /* Channel Number */
 	}
-	writel(val, regs + DBGINST0);
+	writel(val, regs + PL330_DBGINST0);
 
 	val = *((u32 *)&insn[2]);
-	writel(val, regs + DBGINST1);
+	writel(val, regs + PL330_DBGINST1);
 
 	/* If timed out due to halted state-machine */
 	if (_until_dmac_idle(thrd)) {
@@ -1057,7 +1057,7 @@ static inline void _execute_DBGINSN(struct pl330_thread *thrd,
 	}
 
 	/* Get going */
-	writel(0, regs + DBGCMD);
+	writel(0, regs + PL330_DBGCMD);
 }
 
 /*
@@ -1082,9 +1082,9 @@ static inline u32 _state(struct pl330_thread *thrd)
 	u32 val;
 
 	if (is_manager(thrd))
-		val = readl(regs + DS) & 0xf;
+		val = readl(regs + PL330_DS) & 0xf;
 	else
-		val = readl(regs + CS(thrd->id)) & 0xf;
+		val = readl(regs + PL330_CS(thrd->id)) & 0xf;
 
 	switch (val) {
 	case DS_ST_STOP:
@@ -1151,7 +1151,8 @@ static void _stop(struct pl330_thread *thrd)
 	_emit_KILL(0, insn);
 
 	/* Stop generating interrupts for SEV */
-	writel(readl(regs + INTEN) & ~(1 << thrd->ev), regs + INTEN);
+	writel(readl(regs + PL330_INTEN) & ~(1 << thrd->ev),
+	       regs + PL330_INTEN);
 
 	_execute_DBGINSN(thrd, insn, is_manager(thrd));
 }
@@ -1190,7 +1191,7 @@ static bool _trigger(struct pl330_thread *thrd)
 
 	if (r->cfg)
 		ns = r->cfg->nonsecure ? 1 : 0;
-	else if (readl(regs + CS(thrd->id)) & CS_CNS)
+	else if (readl(regs + PL330_CS(thrd->id)) & CS_CNS)
 		ns = 1;
 	else
 		ns = 0;
@@ -1206,7 +1207,7 @@ static bool _trigger(struct pl330_thread *thrd)
 	_emit_GO(0, insn, &go);
 
 	/* Set to generate interrupts for SEV */
-	writel(readl(regs + INTEN) | (1 << thrd->ev), regs + INTEN);
+	writel(readl(regs + PL330_INTEN) | (1 << thrd->ev), regs + PL330_INTEN);
 
 	/* Only manager can execute GO */
 	_execute_DBGINSN(thrd, insn, true);
@@ -1581,7 +1582,7 @@ static int pl330_submit_req(void *ch_id, struct pl330_req *r)
 
 		ccr = _prepare_ccr(r->cfg);
 	} else {
-		ccr = readl(regs + CC(thrd->id));
+		ccr = readl(regs + PL330_CC(thrd->id));
 	}
 
 	/* If this req doesn't have valid xfer settings */
@@ -1658,7 +1659,7 @@ static void pl330_dotask(unsigned long data)
 
 			_stop(thrd);
 
-			if (readl(regs + FSC) & (1 << thrd->id))
+			if (readl(regs + PL330_FSC) & (1 << thrd->id))
 				err = PL330_ERR_FAIL;
 			else
 				err = PL330_ERR_ABORT;
@@ -1703,13 +1704,13 @@ static int pl330_update(const struct pl330_info *pi)
 
 	spin_lock_irqsave(&pl330->lock, flags);
 
-	val = readl(regs + FSM) & 0x1;
+	val = readl(regs + PL330_FSM) & 0x1;
 	if (val)
 		pl330->dmac_tbd.reset_mngr = true;
 	else
 		pl330->dmac_tbd.reset_mngr = false;
 
-	val = readl(regs + FSC) & ((1 << pi->pcfg.num_chan) - 1);
+	val = readl(regs + PL330_FSC) & ((1 << pi->pcfg.num_chan) - 1);
 	pl330->dmac_tbd.reset_chan |= val;
 	if (val) {
 		int i = 0;
@@ -1717,8 +1718,8 @@ static int pl330_update(const struct pl330_info *pi)
 			if (val & (1 << i)) {
 				dev_info(pi->dev,
 					"Reset Channel-%d\t CS-%x FTC-%x\n",
-						i, readl(regs + CS(i)),
-						readl(regs + FTC(i)));
+						i, readl(regs + PL330_CS(i)),
+						readl(regs + PL330_FTC(i)));
 				_stop(&pl330->channels[i]);
 			}
 			i++;
@@ -1726,7 +1727,7 @@ static int pl330_update(const struct pl330_info *pi)
 	}
 
 	/* Check which event happened i.e, thread notified */
-	val = readl(regs + ES);
+	val = readl(regs + PL330_ES);
 	if (pi->pcfg.num_events < 32
 			&& val & ~((1 << pi->pcfg.num_events) - 1)) {
 		pl330->dmac_tbd.reset_dmac = true;
@@ -1738,12 +1739,12 @@ static int pl330_update(const struct pl330_info *pi)
 	for (ev = 0; ev < pi->pcfg.num_events; ev++) {
 		if (val & (1 << ev)) { /* Event occurred */
 			struct pl330_thread *thrd;
-			u32 inten = readl(regs + INTEN);
+			u32 inten = readl(regs + PL330_INTEN);
 			int active;
 
 			/* Clear the event */
 			if (inten & (1 << ev))
-				writel(1 << ev, regs + INTCLR);
+				writel(1 << ev, regs + PL330_INTCLR);
 
 			ret = 1;
 
@@ -1950,41 +1951,41 @@ static void read_dmac_config(struct pl330_info *pi)
 	void __iomem *regs = pi->base;
 	u32 val;
 
-	val = readl(regs + CRD) >> CRD_DATA_WIDTH_SHIFT;
+	val = readl(regs + PL330_CRD) >> CRD_DATA_WIDTH_SHIFT;
 	val &= CRD_DATA_WIDTH_MASK;
 	pi->pcfg.data_bus_width = 8 * (1 << val);
 
-	val = readl(regs + CRD) >> CRD_DATA_BUFF_SHIFT;
+	val = readl(regs + PL330_CRD) >> CRD_DATA_BUFF_SHIFT;
 	val &= CRD_DATA_BUFF_MASK;
 	pi->pcfg.data_buf_dep = val + 1;
 
-	val = readl(regs + CR0) >> CR0_NUM_CHANS_SHIFT;
+	val = readl(regs + PL330_CR0) >> CR0_NUM_CHANS_SHIFT;
 	val &= CR0_NUM_CHANS_MASK;
 	val += 1;
 	pi->pcfg.num_chan = val;
 
-	val = readl(regs + CR0);
+	val = readl(regs + PL330_CR0);
 	if (val & CR0_PERIPH_REQ_SET) {
 		val = (val >> CR0_NUM_PERIPH_SHIFT) & CR0_NUM_PERIPH_MASK;
 		val += 1;
 		pi->pcfg.num_peri = val;
-		pi->pcfg.peri_ns = readl(regs + CR4);
+		pi->pcfg.peri_ns = readl(regs + PL330_CR4);
 	} else {
 		pi->pcfg.num_peri = 0;
 	}
 
-	val = readl(regs + CR0);
+	val = readl(regs + PL330_CR0);
 	if (val & CR0_BOOT_MAN_NS)
 		pi->pcfg.mode |= DMAC_MODE_NS;
 	else
 		pi->pcfg.mode &= ~DMAC_MODE_NS;
 
-	val = readl(regs + CR0) >> CR0_NUM_EVENTS_SHIFT;
+	val = readl(regs + PL330_CR0) >> CR0_NUM_EVENTS_SHIFT;
 	val &= CR0_NUM_EVENTS_MASK;
 	val += 1;
 	pi->pcfg.num_events = val;
 
-	pi->pcfg.irq_ns = readl(regs + CR3);
+	pi->pcfg.irq_ns = readl(regs + PL330_CR3);
 
 	pi->pcfg.periph_id = get_id(pi, PERIPH_ID);
 	pi->pcfg.pcell_id = get_id(pi, PCELL_ID);
-- 
1.7.7.2

[PATCH V6 2/5] watchdog: sp805_wdt depends on ARM

[Alessandro Rubini]

The SP805 driver is only used by the Spear machines, and uses
writel_relaxed, which is not available on all architectures.

The dependency from CONFIG_ARM avoids compilation problems under
randomconfig when CONFIG_ARM_AMBA is enabled for x86 builds.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com>
Signed-off-by: Davide Ciminaghi <ciminaghi@gnudd.com>
Acked-by: Wim Van Sebroeck <wim@iguana.be>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---

@Wim, Viresh, Linus: I repost this after rebasing, on hpa's suggestion.

Viresh's ack: http://lkml.org/lkml/2012/11/23/296
Linus' ack: http://lkml.org/lkml/2012/11/28/259

 drivers/watchdog/Kconfig |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 83ac1f7..e89fc31 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -109,7 +109,7 @@ config WM8350_WATCHDOG
 
 config ARM_SP805_WATCHDOG
 	tristate "ARM SP805 Watchdog"
-	depends on ARM_AMBA
+	depends on ARM && ARM_AMBA
 	select WATCHDOG_CORE
 	help
 	  ARM Primecell SP805 Watchdog timer. This will reboot your system when
-- 
1.7.7.2

[PATCH V6 3/5] mmc: Use the new <linux/sizes.h>

[Alessandro Rubini]

For portability, use <linux/sizes.h>.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com>
Acked-by: David Brown <davidb@codeaurora.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---

@David, Viresh, Linus: I repost this after rebasing, on hpa's suggestion.

Viresh' ack: http://lkml.org/lkml/2012/11/23/328
Linus' ack: http://lkml.org/lkml/2012/12/1/105

 drivers/mmc/host/mmci.c     |    2 +-
 drivers/mmc/host/msm_sdcc.c |    2 +-
 drivers/mmc/host/mvsdio.c   |    2 +-
 drivers/mmc/host/mxcmmc.c   |    2 +-
 drivers/mmc/host/pxamci.c   |    3 +--
 5 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 372e921..a47aa70 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -34,11 +34,11 @@
 #include <linux/amba/mmci.h>
 #include <linux/pm_runtime.h>
 #include <linux/types.h>
+#include <linux/sizes.h>
 #include <linux/pinctrl/consumer.h>
 
 #include <asm/div64.h>
 #include <asm/io.h>
-#include <asm/sizes.h>
 
 #include "mmci.h"
 
diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c
index 7c0af0e..aa61b79 100644
--- a/drivers/mmc/host/msm_sdcc.c
+++ b/drivers/mmc/host/msm_sdcc.c
@@ -37,10 +37,10 @@
 #include <linux/memory.h>
 #include <linux/gfp.h>
 #include <linux/gpio.h>
+#include <linux/sizes.h>
 
 #include <asm/cacheflush.h>
 #include <asm/div64.h>
-#include <asm/sizes.h>
 
 #include <linux/platform_data/mmc-msm_sdcc.h>
 #include <mach/msm_iomap.h>
diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
index 145cdaf..53a1224 100644
--- a/drivers/mmc/host/mvsdio.c
+++ b/drivers/mmc/host/mvsdio.c
@@ -23,11 +23,11 @@
 #include <linux/gpio.h>
 #include <linux/of_gpio.h>
 #include <linux/of_irq.h>
+#include <linux/sizes.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/slot-gpio.h>
 #include <linux/pinctrl/consumer.h>
 
-#include <asm/sizes.h>
 #include <asm/unaligned.h>
 #include <linux/platform_data/mmc-mvsdio.h>
 
diff --git a/drivers/mmc/host/mxcmmc.c b/drivers/mmc/host/mxcmmc.c
index a72936e..8ce7e73 100644
--- a/drivers/mmc/host/mxcmmc.c
+++ b/drivers/mmc/host/mxcmmc.c
@@ -34,10 +34,10 @@
 #include <linux/regulator/consumer.h>
 #include <linux/dmaengine.h>
 #include <linux/types.h>
+#include <linux/sizes.h>
 
 #include <asm/dma.h>
 #include <asm/irq.h>
-#include <asm/sizes.h>
 #include <linux/platform_data/mmc-mxcmmc.h>
 
 #include <linux/platform_data/dma-imx.h>
diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 2b2f65a..6fa54a9 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -33,8 +33,7 @@
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/of_device.h>
-
-#include <asm/sizes.h>
+#include <linux/sizes.h>
 
 #include <mach/hardware.h>
 #include <mach/dma.h>
-- 
1.7.7.2

[PATCH V6 4/5] drivers/amba: add support for a PCI bridge

[Alessandro Rubini]

This is a PCI driver that registers AMBA devices for the range of
supported devices.  It is currently used by STA2X11, which exports
AMBA peripherals under PCIe.  The original AMBA drivers work with no
changes or minimal ones.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---

@Russell, Alan: I repost this again, on hpa's suggestion,
as I filled more acked-by in some patches of this set, but not this one.

 drivers/Kconfig         |    2 +
 drivers/amba/Kconfig    |   10 +++++
 drivers/amba/Makefile   |    1 +
 drivers/amba/pci-amba.c |   93 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 106 insertions(+), 0 deletions(-)
 create mode 100644 drivers/amba/Kconfig
 create mode 100644 drivers/amba/pci-amba.c

diff --git a/drivers/Kconfig b/drivers/Kconfig
index 202fa6d..e17144d 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -162,4 +162,6 @@ source "drivers/irqchip/Kconfig"
 
 source "drivers/ipack/Kconfig"
 
+source "drivers/amba/Kconfig"
+
 endmenu
diff --git a/drivers/amba/Kconfig b/drivers/amba/Kconfig
new file mode 100644
index 0000000..b5b5aca
--- /dev/null
+++ b/drivers/amba/Kconfig
@@ -0,0 +1,10 @@
+
+config PCI_AMBA
+	tristate "PCI-to-AMBA bridge"
+	depends on ARM_AMBA && PCI
+	---help---
+	  This compiles a PCI driver that registers AMBA devices, so
+	  the respective AMBA driver can be used unchanged if you have
+	  a PCI to amba bridge. This is required for STA2X11 support.
+
+	  If uncertain, choose N.
diff --git a/drivers/amba/Makefile b/drivers/amba/Makefile
index 66e81c2..d30e947 100644
--- a/drivers/amba/Makefile
+++ b/drivers/amba/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_ARM_AMBA)		+= bus.o
+obj-$(CONFIG_PCI_AMBA)		+= pci-amba.o
 obj-$(CONFIG_TEGRA_AHB)		+= tegra-ahb.o
diff --git a/drivers/amba/pci-amba.c b/drivers/amba/pci-amba.c
new file mode 100644
index 0000000..ff46575
--- /dev/null
+++ b/drivers/amba/pci-amba.c
@@ -0,0 +1,93 @@
+/*
+ * Support for AMBA devices (both APB and AHB) behind a PCI bridge
+ * Copyright 2012 ST Microelectronics (Alessandro Rubini)
+ * GNU GPL version 2.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/amba/bus.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+#include <linux/sizes.h>
+
+static int pci_amba_probe(struct pci_dev *pdev,
+				     const struct pci_device_id *id)
+{
+	struct amba_device *adev;
+	char *name;
+	int ret;
+
+	pci_enable_msi(pdev);
+	ret = pci_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	/* Create a name: each of them must be different */
+	name = devm_kzalloc(&pdev->dev, strlen(dev_name(&pdev->dev)) + 6,
+		GFP_KERNEL);
+	sprintf(name, "amba-%s", dev_name(&pdev->dev));
+
+	/* Simply build an amba device and register it */
+	adev = amba_device_alloc(name,  pdev->resource[0].start, SZ_4K);
+	if (!adev)
+		return -ENOMEM;
+	adev->irq[0] = pdev->irq;
+
+	/* This bridge can host both APB and AHB devices, so set master */
+	pci_set_master(pdev);
+	if (pdev->vendor == PCI_VENDOR_ID_STMICRO) {
+		/* Under sta2x11, DMA is there but limited to 512M */
+		adev->dma_mask = SZ_512M - 1;
+		adev->dev.coherent_dma_mask = SZ_512M - 1;
+	}
+
+	adev->dev.platform_data = pdev->dev.platform_data;
+	pci_set_drvdata(pdev, adev);
+
+	return amba_device_add(adev, &pdev->resource[0]);
+};
+
+static void pci_amba_remove(struct pci_dev *pdev)
+{
+	struct amba_device *adev = pci_get_drvdata(pdev);
+	amba_device_unregister(adev);
+	pci_disable_msi(pdev);
+}
+
+static DEFINE_PCI_DEVICE_TABLE(pci_amba_table) = {
+	{PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_UART_HWFC)},
+	{PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_UART_NO_HWFC)},
+	{PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_SOC_DMA)},
+	{PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_I2C)},
+	{PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_SPI_HS)},
+	{PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_SDIO_EMMC)},
+	{PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_SDIO)},
+	{PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_AUDIO_ROUTER_DMA)},
+	{PCI_VDEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_AUDIO_ROUTER_MSPS)},
+	{0,}
+};
+
+static struct pci_driver pci_amba_driver = {
+	.name		= "pci-amba",
+	.id_table	= pci_amba_table,
+	.probe		= pci_amba_probe,
+	.remove		= pci_amba_remove,
+};
+
+static int __init pci_amba_init(void)
+{
+	return pci_register_driver(&pci_amba_driver);
+}
+
+static void __exit pci_amba_exit(void)
+{
+	pci_unregister_driver(&pci_amba_driver);
+}
+
+module_init(pci_amba_init);
+module_exit(pci_amba_exit);
+
+MODULE_LICENSE("GPL");
-- 
1.7.7.2

[PATCH V6 5/5] x86: add CONFIG_ARM_AMBA, selected by STA2X11

[Alessandro Rubini]

The sta2x11 I/O Hub is a bridge from PCIe to AMBA. It reuses a number
of amba drivers and needs to activate core bus support.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
 arch/x86/Kconfig |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b11f082..fc06c25 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -548,6 +548,7 @@ config STA2X11
 	select SWIOTLB
 	select MFD_STA2X11
 	select ARCH_REQUIRE_GPIOLIB
+	select ARM_AMBA
 	default n
 	---help---
 	  This adds support for boards based on the STA2X11 IO-Hub,
@@ -2271,6 +2272,9 @@ config TS5500
 
 endif # X86_32
 
+config ARM_AMBA
+        bool
+
 config AMD_NB
 	def_bool y
 	depends on CPU_SUP_AMD && PCI
-- 
1.7.7.2

Re: [PATCH V6 2/5] watchdog: sp805_wdt depends on ARM

[Wim Van Sebroeck]

Hi Alessandro,

> The SP805 driver is only used by the Spear machines, and uses
> writel_relaxed, which is not available on all architectures.
> 
> The dependency from CONFIG_ARM avoids compilation problems under
> randomconfig when CONFIG_ARM_AMBA is enabled for x86 builds.
> 
> Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
> Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com>
> Signed-off-by: Davide Ciminaghi <ciminaghi@gnudd.com>
> Acked-by: Wim Van Sebroeck <wim@iguana.be>
> Acked-by: Linus Walleij <linus.walleij@linaro.org>
> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Added to linux-watchdog-next.

Kind regards,
Wim.