* [PATCH 0/3] AMBA Bus support
@ 2012-09-01 10:22 Jean-Christophe PLAGNIOL-VILLARD
2012-09-01 12:36 ` [PATCH 1/3] Introduce ARM AMBA bus Jean-Christophe PLAGNIOL-VILLARD
0 siblings, 1 reply; 6+ messages in thread
From: Jean-Christophe PLAGNIOL-VILLARD @ 2012-09-01 10:22 UTC (permalink / raw)
To: barebox
Hi,
this first patch series add the AMBA Bus support and is a preperation
for the adding of the ST-E ux500 support
please pull
The following changes since commit 44e196a22ea87b1b08b25547a0b99fc795fecdf6:
Merge branch 'for-next/ppc' into next (2012-08-13 21:39:34 +0200)
are available in the git repository at:
git://git.jcrosoft.org/barebox.git tags/amba_bus
for you to fetch changes up to f2dc82e31bdaf1baa3191940ce1f7789270c8d14:
amba-pl011: add st specific init (2012-09-01 16:56:36 +0800)
----------------------------------------------------------------
arm: Introduce ARM AMBA bus
This allow to detect the amba device and use the right driver for it at
runtime.
With pl011 amba support (ARM & ST Variant)
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
----------------------------------------------------------------
Jean-Christophe PLAGNIOL-VILLARD (3):
Introduce ARM AMBA bus
amba-pl011: switch to amba bus
amba-pl011: add st specific init
arch/arm/mach-nomadik/8815.c | 9 +++--
arch/arm/mach-versatile/core.c | 7 +++-
drivers/Makefile | 1 +
drivers/amba/Makefile | 2 +
drivers/amba/bus.c | 212 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
drivers/serial/amba-pl011.c | 74 +++++++++++++++++++++++++++++------
include/linux/amba/bus.h | 157 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/amba/serial.h | 29 ++++++++++++++
8 files changed, 473 insertions(+), 18 deletions(-)
create mode 100644 drivers/amba/Makefile
create mode 100644 drivers/amba/bus.c
create mode 100644 include/linux/amba/bus.h
Best Regards,
J.
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 1/3] Introduce ARM AMBA bus
2012-09-01 10:22 [PATCH 0/3] AMBA Bus support Jean-Christophe PLAGNIOL-VILLARD
@ 2012-09-01 12:36 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-01 12:36 ` [PATCH 2/3] amba-pl011: switch to amba bus Jean-Christophe PLAGNIOL-VILLARD
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Jean-Christophe PLAGNIOL-VILLARD @ 2012-09-01 12:36 UTC (permalink / raw)
To: barebox
This will allow to detect the amba device and use the right driver for it at
runtime.
The code is base on linux 3.5.
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
drivers/Makefile | 1 +
drivers/amba/Makefile | 2 +
drivers/amba/bus.c | 212 ++++++++++++++++++++++++++++++++++++++++++++++
include/linux/amba/bus.h | 157 ++++++++++++++++++++++++++++++++++
4 files changed, 372 insertions(+)
create mode 100644 drivers/amba/Makefile
create mode 100644 drivers/amba/bus.c
create mode 100644 include/linux/amba/bus.h
diff --git a/drivers/Makefile b/drivers/Makefile
index 005ab24..ceb8f82 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -1,4 +1,5 @@
obj-y += base/
+obj-$(CONFIG_ARM_AMBA) += amba/
obj-y += net/
obj-y += serial/
obj-y += mtd/
diff --git a/drivers/amba/Makefile b/drivers/amba/Makefile
new file mode 100644
index 0000000..a4a511b
--- /dev/null
+++ b/drivers/amba/Makefile
@@ -0,0 +1,2 @@
+
+obj-y += bus.o
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
new file mode 100644
index 0000000..6cde349
--- /dev/null
+++ b/drivers/amba/bus.c
@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
+ * Copyright (c) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * Under GPLv2.
+ */
+#include <common.h>
+#include <driver.h>
+#include <linux/clk.h>
+#include <linux/amba/bus.h>
+#include <io.h>
+
+#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
+
+static const struct amba_id *
+amba_lookup(const struct amba_id *table, struct amba_device *dev)
+{
+ int ret = 0;
+
+ while (table->mask) {
+ ret = (dev->periphid & table->mask) == table->id;
+ if (ret)
+ break;
+ table++;
+ }
+
+ return ret ? table : NULL;
+}
+
+static int amba_match(struct device_d *dev, struct driver_d *drv)
+{
+ struct amba_device *pcdev = to_amba_device(dev);
+
+ struct amba_driver *pcdrv = to_amba_driver(drv);
+
+ return amba_lookup(pcdrv->id_table, pcdev) == NULL;
+}
+
+static int amba_get_enable_pclk(struct amba_device *pcdev)
+{
+ struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
+ int ret;
+
+ pcdev->pclk = pclk;
+
+ if (IS_ERR(pclk))
+ return PTR_ERR(pclk);
+
+ ret = clk_enable(pclk);
+ if (ret) {
+ clk_put(pclk);
+ }
+
+ return ret;
+}
+
+static int amba_probe(struct device_d *dev)
+{
+ struct amba_device *pcdev = to_amba_device(dev);
+ struct amba_driver *pcdrv = to_amba_driver(dev->driver);
+ const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
+
+ return pcdrv->probe(pcdev, id);
+}
+
+static void amba_remove(struct device_d *dev)
+{
+ struct amba_device *pcdev = to_amba_device(dev);
+ struct amba_driver *drv = to_amba_driver(dev->driver);
+
+ drv->remove(pcdev);
+}
+
+struct bus_type amba_bustype = {
+ .name = "amba",
+ .match = amba_match,
+ .probe = amba_probe,
+ .remove = amba_remove,
+};
+
+int amba_driver_register(struct amba_driver *drv)
+{
+ drv->drv.bus = &amba_bustype;
+#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
+ SETFN(probe);
+ SETFN(remove);
+
+ return register_driver(&drv->drv);
+}
+
+/**
+ * amba_device_add - add a previously allocated AMBA device structure
+ * @dev: AMBA device allocated by amba_device_alloc
+ * @parent: resource parent for this devices resources
+ *
+ * Claim the resource, and read the device cell ID if not already
+ * initialized. Register the AMBA device with the Linux device
+ * manager.
+ */
+int amba_device_add(struct amba_device *dev)
+{
+ u32 size;
+ void __iomem *tmp;
+ int i, ret;
+ struct resource *res = NULL;
+
+ dev->dev.bus = &amba_bustype;
+
+ /*
+ * Dynamically calculate the size of the resource
+ * and use this for iomap
+ */
+ size = resource_size(&dev->res);
+ res = request_iomem_region("amba", dev->res.start, dev->res.end);
+ if (!res)
+ return -ENOMEM;
+ dev->base = tmp = (void __force __iomem *)res->start;
+ if (!tmp) {
+ ret = -ENOMEM;
+ goto err_release;
+ }
+
+ /* Hard-coded primecell ID instead of plug-n-play */
+ if (dev->periphid != 0)
+ goto skip_probe;
+
+ ret = amba_get_enable_pclk(dev);
+ if (ret == 0) {
+ u32 pid, cid;
+
+ /*
+ * Read pid and cid based on size of resource
+ * they are located at end of region
+ */
+ for (pid = 0, i = 0; i < 4; i++)
+ pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
+ (i * 8);
+ for (cid = 0, i = 0; i < 4; i++)
+ cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
+ (i * 8);
+
+ if (cid == AMBA_CID)
+ dev->periphid = pid;
+
+ if (!dev->periphid)
+ ret = -ENODEV;
+ }
+
+ if (ret)
+ goto err_release;
+
+ skip_probe:
+ ret = register_device(&dev->dev);
+ if (ret)
+ goto err_release;
+
+ return ret;
+ err_release:
+ release_region(res);
+ return ret;
+}
+
+struct amba_device *
+amba_aphb_device_add(struct device_d *parent, const char *name, int id,
+ resource_size_t base, size_t size,
+ void *pdata, unsigned int periphid)
+{
+ struct amba_device *dev;
+ int ret;
+
+ dev = amba_device_alloc(name, id, base, size);
+ if (!dev)
+ return ERR_PTR(-ENOMEM);
+
+ dev->periphid = periphid;
+ dev->dev.platform_data = pdata;
+ dev->dev.parent = parent;
+
+ ret = amba_device_add(dev);
+ if (ret) {
+ return ERR_PTR(ret);
+ }
+
+ return dev;
+}
+
+/**
+ * amba_device_alloc - allocate an AMBA device
+ * @name: sysfs name of the AMBA device
+ * @base: base of AMBA device
+ * @size: size of AMBA device
+ *
+ * Allocate and initialize an AMBA device structure. Returns %NULL
+ * on failure.
+ */
+struct amba_device *amba_device_alloc(const char *name, int id, resource_size_t base,
+ size_t size)
+{
+ struct amba_device *dev;
+
+ dev = xzalloc(sizeof(*dev));
+ if (dev) {
+ strcpy(dev->dev.name, name);
+ dev->dev.id = id;
+ dev->res.start = base;
+ dev->res.end = base + size - 1;
+ dev->res.flags = IORESOURCE_MEM;
+ }
+
+ return dev;
+}
+
diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
new file mode 100644
index 0000000..34e6ace
--- /dev/null
+++ b/include/linux/amba/bus.h
@@ -0,0 +1,157 @@
+/*
+ * linux/include/amba/bus.h
+ *
+ * This device type deals with ARM PrimeCells and anything else that
+ * presents a proper CID (0xB105F00D) at the end of the I/O register
+ * region or that is derived from a PrimeCell.
+ *
+ * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
+ *
+ * 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 ASMARM_AMBA_H
+#define ASMARM_AMBA_H
+
+#include <linux/clk.h>
+#include <driver.h>
+#include <linux/err.h>
+
+#define AMBA_CID 0xb105f00d
+
+/**
+ * struct amba_id - identifies a device on an AMBA bus
+ * @id: The significant bits if the hardware device ID
+ * @mask: Bitmask specifying which bits of the id field are significant when
+ * matching. A driver binds to a device when ((hardware device ID) & mask)
+ * == id.
+ * @data: Private data used by the driver.
+ */
+struct amba_id {
+ unsigned int id;
+ unsigned int mask;
+#ifndef __KERNEL__
+ kernel_ulong_t data;
+#else
+ void *data;
+#endif
+};
+
+struct clk;
+
+struct amba_device {
+ struct device_d dev;
+ struct resource res;
+ void __iomem *base;
+ struct clk *pclk;
+ unsigned int periphid;
+};
+
+struct amba_driver {
+ struct driver_d drv;
+ int (*probe)(struct amba_device *, const struct amba_id *);
+ int (*remove)(struct amba_device *);
+ const struct amba_id *id_table;
+};
+
+enum amba_vendor {
+ AMBA_VENDOR_ARM = 0x41,
+ AMBA_VENDOR_ST = 0x80,
+};
+
+extern struct bus_type amba_bustype;
+
+#define to_amba_device(d) container_of(d, struct amba_device, dev)
+
+#define amba_get_drvdata(d) dev_get_drvdata(&d->dev)
+#define amba_set_drvdata(d,p) dev_set_drvdata(&d->dev, p)
+
+int amba_driver_register(struct amba_driver *);
+void amba_driver_unregister(struct amba_driver *);
+struct amba_device *amba_device_alloc(const char *, int id, resource_size_t, size_t);
+void amba_device_put(struct amba_device *);
+int amba_device_add(struct amba_device *);
+int amba_device_register(struct amba_device *, struct resource *);
+
+struct amba_device *
+amba_aphb_device_add(struct device_d *parent, const char *name, int id,
+ resource_size_t base, size_t size,
+ void *pdata, unsigned int periphid);
+
+static inline struct amba_device *
+amba_apb_device_add(struct device_d *parent, const char *name, int id,
+ resource_size_t base, size_t size,
+ void *pdata, unsigned int periphid)
+{
+ return amba_aphb_device_add(parent, name, id, base, size, pdata,
+ periphid);
+}
+
+static inline struct amba_device *
+amba_ahb_device_add(struct device_d *parent, const char *name, int id,
+ resource_size_t base, size_t size,
+ void *pdata, unsigned int periphid)
+{
+ return amba_aphb_device_add(parent, name, id, base, size, pdata,
+ periphid);
+}
+
+
+void amba_device_unregister(struct amba_device *);
+struct amba_device *amba_find_device(const char *, struct device_d *, unsigned int, unsigned int);
+int amba_request_regions(struct amba_device *, const char *);
+void amba_release_regions(struct amba_device *);
+
+static inline void __iomem *amba_get_mem_region(struct amba_device *dev)
+{
+ return dev->base;
+}
+
+#define amba_pclk_enable(d) \
+ (IS_ERR((d)->pclk) ? 0 : clk_enable((d)->pclk))
+
+#define amba_pclk_disable(d) \
+ do { if (!IS_ERR((d)->pclk)) clk_disable((d)->pclk); } while (0)
+
+/* Some drivers don't use the struct amba_device */
+#define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff)
+#define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f)
+#define AMBA_MANF_BITS(a) (((a) >> 12) & 0xff)
+#define AMBA_PART_BITS(a) ((a) & 0xfff)
+
+#define amba_config(d) AMBA_CONFIG_BITS((d)->periphid)
+#define amba_rev(d) AMBA_REV_BITS((d)->periphid)
+#define amba_manf(d) AMBA_MANF_BITS((d)->periphid)
+#define amba_part(d) AMBA_PART_BITS((d)->periphid)
+
+#define __AMBA_DEV(busid, data) \
+ { \
+ .init_name = busid, \
+ .platform_data = data, \
+ }
+
+/*
+ * APB devices do not themselves have the ability to address memory,
+ * so DMA masks should be zero (much like USB peripheral devices.)
+ * The DMA controller DMA masks should be used instead (much like
+ * USB host controllers in conventional PCs.)
+ */
+#define AMBA_APB_DEVICE(name, busid, id, base, data) \
+struct amba_device name##_device = { \
+ .dev = __AMBA_DEV(busid, data), \
+ .res = DEFINE_RES_MEM(base, SZ_4K), \
+ .periphid = id, \
+}
+
+/*
+ * AHB devices are DMA capable, so set their DMA masks
+ */
+#define AMBA_AHB_DEVICE(name, busid, id, base, data) \
+struct amba_device name##_device = { \
+ .dev = __AMBA_DEV(busid, data), \
+ .res = DEFINE_RES_MEM(base, SZ_4K), \
+ .periphid = id, \
+}
+
+#endif
--
1.7.10.4
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 2/3] amba-pl011: switch to amba bus
2012-09-01 12:36 ` [PATCH 1/3] Introduce ARM AMBA bus Jean-Christophe PLAGNIOL-VILLARD
@ 2012-09-01 12:36 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-01 12:36 ` [PATCH 3/3] amba-pl011: add st specific init Jean-Christophe PLAGNIOL-VILLARD
2012-09-10 7:25 ` [PATCH 1/3] Introduce ARM AMBA bus Sascha Hauer
2 siblings, 0 replies; 6+ messages in thread
From: Jean-Christophe PLAGNIOL-VILLARD @ 2012-09-01 12:36 UTC (permalink / raw)
To: barebox
switch as the same time the nomadik and versatile arch that use the driver.
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
arch/arm/mach-nomadik/8815.c | 9 +++++----
arch/arm/mach-versatile/core.c | 7 +++++--
drivers/serial/amba-pl011.c | 34 ++++++++++++++++++++++++----------
3 files changed, 34 insertions(+), 16 deletions(-)
diff --git a/arch/arm/mach-nomadik/8815.c b/arch/arm/mach-nomadik/8815.c
index e385598..aecd9e0 100644
--- a/arch/arm/mach-nomadik/8815.c
+++ b/arch/arm/mach-nomadik/8815.c
@@ -25,6 +25,7 @@
#include <mach/hardware.h>
#include <asm/armlinux.h>
#include <generated/mach-types.h>
+#include <linux/amba/bus.h>
#include "clock.h"
@@ -32,12 +33,15 @@ static struct clk st8815_clk_48 = {
.rate = 48 * 1000 * 1000,
};
+static struct clk st8815_dummy;
+
void st8815_add_device_sdram(u32 size)
{
arm_add_mem_device("ram0", 0x00000000, size);
}
static struct clk_lookup clocks_lookups[] = {
+ CLKDEV_CON_ID("apb_pclk", &st8815_dummy),
CLKDEV_DEV_ID("uart-pl0110", &st8815_clk_48),
CLKDEV_DEV_ID("uart-pl0111", &st8815_clk_48),
};
@@ -53,7 +57,6 @@ postcore_initcall(st8815_clkdev_init);
void st8815_register_uart(unsigned id)
{
resource_size_t start;
- struct device_d *dev;
switch (id) {
case 0:
@@ -63,7 +66,5 @@ void st8815_register_uart(unsigned id)
start = NOMADIK_UART1_BASE;
break;
}
- dev = add_generic_device("uart-pl011", id, NULL, start, 4096,
- IORESOURCE_MEM, NULL);
- nmdk_clk_create(&st8815_clk_48, dev_name(dev));
+ amba_apb_device_add(NULL, "uart-pl011", id, start, 4096, NULL, 0);
}
diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c
index bdf48f9..86cc755 100644
--- a/arch/arm/mach-versatile/core.c
+++ b/arch/arm/mach-versatile/core.c
@@ -34,6 +34,7 @@
#include <linux/clkdev.h>
#include <linux/clk.h>
#include <linux/err.h>
+#include <linux/amba/bus.h>
#include <io.h>
#include <asm/hardware/arm_timer.h>
@@ -51,6 +52,8 @@ struct clk {
unsigned long rate;
};
+static struct clk ref_clk_dummy;
+
static struct clk ref_clk_24 = {
.rate = 24000000,
};
@@ -145,6 +148,7 @@ static int vpb_clocksource_init(void)
core_initcall(vpb_clocksource_init);
static struct clk_lookup clocks_lookups[] = {
+ CLKDEV_CON_ID("apb_pclk", &ref_clk_dummy),
CLKDEV_DEV_ID("uart-pl0110", &ref_clk_24),
CLKDEV_DEV_ID("uart-pl0111", &ref_clk_24),
CLKDEV_DEV_ID("uart-pl0112", &ref_clk_24),
@@ -179,8 +183,7 @@ void versatile_register_uart(unsigned id)
default:
return;
}
- add_generic_device("uart-pl011", id, NULL, start, 4096,
- IORESOURCE_MEM, NULL);
+ amba_apb_device_add(NULL, "uart-pl011", id, start, 4096, NULL, 0);
}
void __noreturn reset_cpu (unsigned long ignored)
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index f8c55c4..77f8c8a 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -35,6 +35,7 @@
#include <linux/amba/serial.h>
#include <linux/clk.h>
#include <linux/err.h>
+#include <linux/amba/bus.h>
/*
* We wrap our port structure around the generic console_device.
@@ -118,11 +119,8 @@ static int pl011_tstc(struct console_device *cdev)
int pl011_init_port (struct console_device *cdev)
{
- struct device_d *dev = cdev->dev;
struct amba_uart_port *uart = to_amba_uart_port(cdev);
- uart->base = dev_request_mem_region(dev, 0);
-
/*
** First, disable everything.
*/
@@ -154,19 +152,20 @@ int pl011_init_port (struct console_device *cdev)
return 0;
}
-static int pl011_probe(struct device_d *dev)
+static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
{
struct amba_uart_port *uart;
struct console_device *cdev;
uart = xzalloc(sizeof(struct amba_uart_port));
- uart->clk = clk_get(dev, NULL);
+ uart->clk = clk_get(&dev->dev, NULL);
+ uart->base = amba_get_mem_region(dev);
if (IS_ERR(uart->clk))
return PTR_ERR(uart->clk);
cdev = &uart->uart;
- cdev->dev = dev;
+ cdev->dev = &dev->dev;
cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
cdev->tstc = pl011_tstc;
cdev->putc = pl011_putc;
@@ -182,14 +181,29 @@ static int pl011_probe(struct device_d *dev)
return 0;
}
-static struct driver_d pl011_driver = {
- .name = "uart-pl011",
- .probe = pl011_probe,
+static struct amba_id pl011_ids[] = {
+ {
+ .id = 0x00041011,
+ .mask = 0x000fffff,
+ },
+ {
+ .id = 0x00380802,
+ .mask = 0x00ffffff,
+ },
+ { 0, 0 },
+};
+
+struct amba_driver pl011_driver = {
+ .drv = {
+ .name = "uart-pl011",
+ },
+ .probe = pl011_probe,
+ .id_table = pl011_ids,
};
static int pl011_init(void)
{
- register_driver(&pl011_driver);
+ amba_driver_register(&pl011_driver);
return 0;
}
--
1.7.10.4
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 3/3] amba-pl011: add st specific init
2012-09-01 12:36 ` [PATCH 1/3] Introduce ARM AMBA bus Jean-Christophe PLAGNIOL-VILLARD
2012-09-01 12:36 ` [PATCH 2/3] amba-pl011: switch to amba bus Jean-Christophe PLAGNIOL-VILLARD
@ 2012-09-01 12:36 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-10 7:25 ` [PATCH 1/3] Introduce ARM AMBA bus Sascha Hauer
2 siblings, 0 replies; 6+ messages in thread
From: Jean-Christophe PLAGNIOL-VILLARD @ 2012-09-01 12:36 UTC (permalink / raw)
To: barebox
This is need on the new IP for ux500
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
drivers/serial/amba-pl011.c | 40 ++++++++++++++++++++++++++++++++++++++--
include/linux/amba/serial.h | 29 +++++++++++++++++++++++++++++
2 files changed, 67 insertions(+), 2 deletions(-)
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 77f8c8a..b62dc9f 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -45,6 +45,23 @@ struct amba_uart_port {
struct console_device uart; /* uart */
struct clk *clk; /* uart clock */
u32 uartclk;
+ struct vendor_data *vendor;
+};
+
+/* There is by now at least one vendor with differing details, so handle it */
+struct vendor_data {
+ unsigned int lcrh_tx;
+ unsigned int lcrh_rx;
+};
+
+static struct vendor_data vendor_arm = {
+ .lcrh_tx = UART011_LCRH,
+ .lcrh_rx = UART011_LCRH,
+};
+
+static struct vendor_data vendor_st = {
+ .lcrh_tx = ST_UART011_LCRH_TX,
+ .lcrh_rx = ST_UART011_LCRH_RX,
};
static inline struct amba_uart_port *
@@ -117,6 +134,23 @@ static int pl011_tstc(struct console_device *cdev)
return !(readl(uart->base + UART01x_FR) & UART01x_FR_RXFE);
}
+static void pl011_rlcr(struct amba_uart_port *uart, u32 lcr)
+{
+ struct vendor_data *vendor = uart->vendor;
+
+ writew(lcr, uart->base + vendor->lcrh_rx);
+ if (vendor->lcrh_tx != vendor->lcrh_rx) {
+ int i;
+ /*
+ * Wait 10 PCLKs before writing LCRH_TX register,
+ * to get this delay write read only register 10 times
+ */
+ for (i = 0; i < 10; ++i)
+ writew(0xff, uart->base + UART011_MIS);
+ writew(lcr, uart->base + vendor->lcrh_tx);
+ }
+}
+
int pl011_init_port (struct console_device *cdev)
{
struct amba_uart_port *uart = to_amba_uart_port(cdev);
@@ -140,8 +174,7 @@ int pl011_init_port (struct console_device *cdev)
/*
** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
*/
- writel((UART01x_LCRH_WLEN_8 | UART01x_LCRH_FEN),
- uart->base + UART011_LCRH);
+ pl011_rlcr(uart, UART01x_LCRH_WLEN_8 | UART01x_LCRH_FEN);
/*
** Finally, enable the UART
@@ -160,6 +193,7 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
uart = xzalloc(sizeof(struct amba_uart_port));
uart->clk = clk_get(&dev->dev, NULL);
uart->base = amba_get_mem_region(dev);
+ uart->vendor = (void*)id->data;
if (IS_ERR(uart->clk))
return PTR_ERR(uart->clk);
@@ -185,10 +219,12 @@ static struct amba_id pl011_ids[] = {
{
.id = 0x00041011,
.mask = 0x000fffff,
+ .data = &vendor_arm,
},
{
.id = 0x00380802,
.mask = 0x00ffffff,
+ .data = &vendor_st,
},
{ 0, 0 },
};
diff --git a/include/linux/amba/serial.h b/include/linux/amba/serial.h
index f4d7bf8..6670f1f 100644
--- a/include/linux/amba/serial.h
+++ b/include/linux/amba/serial.h
@@ -32,16 +32,20 @@
#define UART01x_RSR 0x04 /* Receive status register (Read). */
#define UART01x_ECR 0x04 /* Error clear register (Write). */
#define UART010_LCRH 0x08 /* Line control register, high byte. */
+#define ST_UART011_DMAWM 0x08 /* DMA watermark configure register. */
#define UART010_LCRM 0x0C /* Line control register, middle byte. */
+#define ST_UART011_TIMEOUT 0x0C /* Timeout period register. */
#define UART010_LCRL 0x10 /* Line control register, low byte. */
#define UART010_CR 0x14 /* Control register. */
#define UART01x_FR 0x18 /* Flag register (Read only). */
#define UART010_IIR 0x1C /* Interrupt indentification register (Read). */
#define UART010_ICR 0x1C /* Interrupt clear register (Write). */
+#define ST_UART011_LCRH_RX 0x1C /* Rx line control register. */
#define UART01x_ILPR 0x20 /* IrDA low power counter register. */
#define UART011_IBRD 0x24 /* Integer baud rate divisor register. */
#define UART011_FBRD 0x28 /* Fractional baud rate divisor register. */
#define UART011_LCRH 0x2c /* Line control register. */
+#define ST_UART011_LCRH_TX 0x2c /* Tx Line control register. */
#define UART011_CR 0x30 /* Control register. */
#define UART011_IFLS 0x34 /* Interrupt fifo level select. */
#define UART011_IMSC 0x38 /* Interrupt mask. */
@@ -49,6 +53,15 @@
#define UART011_MIS 0x40 /* Masked interrupt status. */
#define UART011_ICR 0x44 /* Interrupt clear register. */
#define UART011_DMACR 0x48 /* DMA control register. */
+#define ST_UART011_XFCR 0x50 /* XON/XOFF control register. */
+#define ST_UART011_XON1 0x54 /* XON1 register. */
+#define ST_UART011_XON2 0x58 /* XON2 register. */
+#define ST_UART011_XOFF1 0x5C /* XON1 register. */
+#define ST_UART011_XOFF2 0x60 /* XON2 register. */
+#define ST_UART011_ITCR 0x80 /* Integration test control register. */
+#define ST_UART011_ITIP 0x84 /* Integration test input register. */
+#define ST_UART011_ABCR 0x100 /* Autobaud control register. */
+#define ST_UART011_ABIMSC 0x15C /* Autobaud interrupt mask/clear register. */
#define UART011_DR_OE (1 << 11)
#define UART011_DR_BE (1 << 10)
@@ -84,6 +97,7 @@
#define UART010_CR_TIE 0x0020
#define UART010_CR_RIE 0x0010
#define UART010_CR_MSIE 0x0008
+#define ST_UART011_CR_OVSFACT 0x0008 /* Oversampling factor */
#define UART01x_CR_IIRLP 0x0004 /* SIR low power mode */
#define UART01x_CR_SIREN 0x0002 /* SIR enable */
#define UART01x_CR_UARTEN 0x0001 /* UART enable */
@@ -99,6 +113,21 @@
#define UART01x_LCRH_PEN 0x02
#define UART01x_LCRH_BRK 0x01
+#define ST_UART011_DMAWM_RX_1 (0 << 3)
+#define ST_UART011_DMAWM_RX_2 (1 << 3)
+#define ST_UART011_DMAWM_RX_4 (2 << 3)
+#define ST_UART011_DMAWM_RX_8 (3 << 3)
+#define ST_UART011_DMAWM_RX_16 (4 << 3)
+#define ST_UART011_DMAWM_RX_32 (5 << 3)
+#define ST_UART011_DMAWM_RX_48 (6 << 3)
+#define ST_UART011_DMAWM_TX_1 0
+#define ST_UART011_DMAWM_TX_2 1
+#define ST_UART011_DMAWM_TX_4 2
+#define ST_UART011_DMAWM_TX_8 3
+#define ST_UART011_DMAWM_TX_16 4
+#define ST_UART011_DMAWM_TX_32 5
+#define ST_UART011_DMAWM_TX_48 6
+
#define UART010_IIR_RTIS 0x08
#define UART010_IIR_TIS 0x04
#define UART010_IIR_RIS 0x02
--
1.7.10.4
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 1/3] Introduce ARM AMBA bus
2012-09-01 12:36 ` [PATCH 1/3] Introduce ARM AMBA bus Jean-Christophe PLAGNIOL-VILLARD
2012-09-01 12:36 ` [PATCH 2/3] amba-pl011: switch to amba bus Jean-Christophe PLAGNIOL-VILLARD
2012-09-01 12:36 ` [PATCH 3/3] amba-pl011: add st specific init Jean-Christophe PLAGNIOL-VILLARD
@ 2012-09-10 7:25 ` Sascha Hauer
2 siblings, 0 replies; 6+ messages in thread
From: Sascha Hauer @ 2012-09-10 7:25 UTC (permalink / raw)
To: Jean-Christophe PLAGNIOL-VILLARD; +Cc: barebox
On Sat, Sep 01, 2012 at 02:36:28PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> This will allow to detect the amba device and use the right driver for it at
> runtime.
>
> The code is base on linux 3.5.
>
> +
> +int amba_driver_register(struct amba_driver *drv)
> +{
> + drv->drv.bus = &amba_bustype;
> +#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
> + SETFN(probe);
> + SETFN(remove);
Can we please drop this SETFN and just open code it? Being able to grep
for amba_probe and finding its users is quite convenient. No, I don't
care that in Linux it's also done like this.
> +struct amba_device *amba_device_alloc(const char *name, int id, resource_size_t base,
> + size_t size)
> +{
> + struct amba_device *dev;
> +
> + dev = xzalloc(sizeof(*dev));
> + if (dev) {
xzalloc always returns a valid pointer.
> + strcpy(dev->dev.name, name);
> + dev->dev.id = id;
> + dev->res.start = base;
> + dev->res.end = base + size - 1;
> + dev->res.flags = IORESOURCE_MEM;
> + }
> +
> + return dev;
> +}
> +
> +/**
> + * struct amba_id - identifies a device on an AMBA bus
> + * @id: The significant bits if the hardware device ID
> + * @mask: Bitmask specifying which bits of the id field are significant when
> + * matching. A driver binds to a device when ((hardware device ID) & mask)
> + * == id.
> + * @data: Private data used by the driver.
> + */
> +struct amba_id {
> + unsigned int id;
> + unsigned int mask;
> +#ifndef __KERNEL__
> + kernel_ulong_t data;
> +#else
> + void *data;
> +#endif
Drop this ifdef.
Sascha
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 1/3] Introduce ARM AMBA bus
2012-09-11 4:47 [PATCH 0/3 v2] AMBA Bus support Jean-Christophe PLAGNIOL-VILLARD
@ 2012-09-11 4:51 ` Jean-Christophe PLAGNIOL-VILLARD
0 siblings, 0 replies; 6+ messages in thread
From: Jean-Christophe PLAGNIOL-VILLARD @ 2012-09-11 4:51 UTC (permalink / raw)
To: barebox
This will allow to detect the amba device and use the right driver for it at
runtime.
The code is base on linux 3.5.
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
drivers/Makefile | 1 +
drivers/amba/Makefile | 2 +
drivers/amba/bus.c | 210 ++++++++++++++++++++++++++++++++++++++++++++++
include/linux/amba/bus.h | 153 +++++++++++++++++++++++++++++++++
4 files changed, 366 insertions(+)
create mode 100644 drivers/amba/Makefile
create mode 100644 drivers/amba/bus.c
create mode 100644 include/linux/amba/bus.h
diff --git a/drivers/Makefile b/drivers/Makefile
index 28a5cb8..0b44e90 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -1,4 +1,5 @@
obj-y += base/
+obj-$(CONFIG_ARM_AMBA) += amba/
obj-y += net/
obj-y += serial/
obj-y += mtd/
diff --git a/drivers/amba/Makefile b/drivers/amba/Makefile
new file mode 100644
index 0000000..a4a511b
--- /dev/null
+++ b/drivers/amba/Makefile
@@ -0,0 +1,2 @@
+
+obj-y += bus.o
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
new file mode 100644
index 0000000..383c77e
--- /dev/null
+++ b/drivers/amba/bus.c
@@ -0,0 +1,210 @@
+/*
+ * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
+ * Copyright (c) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * Under GPLv2.
+ */
+#include <common.h>
+#include <driver.h>
+#include <linux/clk.h>
+#include <linux/amba/bus.h>
+#include <io.h>
+
+#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
+
+static const struct amba_id *
+amba_lookup(const struct amba_id *table, struct amba_device *dev)
+{
+ int ret = 0;
+
+ while (table->mask) {
+ ret = (dev->periphid & table->mask) == table->id;
+ if (ret)
+ break;
+ table++;
+ }
+
+ return ret ? table : NULL;
+}
+
+static int amba_match(struct device_d *dev, struct driver_d *drv)
+{
+ struct amba_device *pcdev = to_amba_device(dev);
+
+ struct amba_driver *pcdrv = to_amba_driver(drv);
+
+ return amba_lookup(pcdrv->id_table, pcdev) == NULL;
+}
+
+static int amba_get_enable_pclk(struct amba_device *pcdev)
+{
+ struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
+ int ret;
+
+ pcdev->pclk = pclk;
+
+ if (IS_ERR(pclk))
+ return PTR_ERR(pclk);
+
+ ret = clk_enable(pclk);
+ if (ret) {
+ clk_put(pclk);
+ }
+
+ return ret;
+}
+
+static int amba_probe(struct device_d *dev)
+{
+ struct amba_device *pcdev = to_amba_device(dev);
+ struct amba_driver *pcdrv = to_amba_driver(dev->driver);
+ const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
+
+ return pcdrv->probe(pcdev, id);
+}
+
+static void amba_remove(struct device_d *dev)
+{
+ struct amba_device *pcdev = to_amba_device(dev);
+ struct amba_driver *drv = to_amba_driver(dev->driver);
+
+ drv->remove(pcdev);
+}
+
+struct bus_type amba_bustype = {
+ .name = "amba",
+ .match = amba_match,
+ .probe = amba_probe,
+ .remove = amba_remove,
+};
+
+int amba_driver_register(struct amba_driver *drv)
+{
+ drv->drv.bus = &amba_bustype;
+
+ if (drv->probe)
+ drv->drv.probe = amba_probe;
+ if (drv->remove)
+ drv->drv.remove = amba_remove;
+
+ return register_driver(&drv->drv);
+}
+
+/**
+ * amba_device_add - add a previously allocated AMBA device structure
+ * @dev: AMBA device allocated by amba_device_alloc
+ * @parent: resource parent for this devices resources
+ *
+ * Claim the resource, and read the device cell ID if not already
+ * initialized. Register the AMBA device with the Linux device
+ * manager.
+ */
+int amba_device_add(struct amba_device *dev)
+{
+ u32 size;
+ void __iomem *tmp;
+ int i, ret;
+ struct resource *res = NULL;
+
+ dev->dev.bus = &amba_bustype;
+
+ /*
+ * Dynamically calculate the size of the resource
+ * and use this for iomap
+ */
+ size = resource_size(&dev->res);
+ res = request_iomem_region("amba", dev->res.start, dev->res.end);
+ if (!res)
+ return -ENOMEM;
+ dev->base = tmp = (void __force __iomem *)res->start;
+ if (!tmp) {
+ ret = -ENOMEM;
+ goto err_release;
+ }
+
+ /* Hard-coded primecell ID instead of plug-n-play */
+ if (dev->periphid != 0)
+ goto skip_probe;
+
+ ret = amba_get_enable_pclk(dev);
+ if (ret == 0) {
+ u32 pid, cid;
+
+ /*
+ * Read pid and cid based on size of resource
+ * they are located at end of region
+ */
+ for (pid = 0, i = 0; i < 4; i++)
+ pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
+ (i * 8);
+ for (cid = 0, i = 0; i < 4; i++)
+ cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
+ (i * 8);
+
+ if (cid == AMBA_CID)
+ dev->periphid = pid;
+
+ if (!dev->periphid)
+ ret = -ENODEV;
+ }
+
+ if (ret)
+ goto err_release;
+
+ skip_probe:
+ ret = register_device(&dev->dev);
+ if (ret)
+ goto err_release;
+
+ return ret;
+ err_release:
+ release_region(res);
+ return ret;
+}
+
+struct amba_device *
+amba_aphb_device_add(struct device_d *parent, const char *name, int id,
+ resource_size_t base, size_t size,
+ void *pdata, unsigned int periphid)
+{
+ struct amba_device *dev;
+ int ret;
+
+ dev = amba_device_alloc(name, id, base, size);
+
+ dev->periphid = periphid;
+ dev->dev.platform_data = pdata;
+ dev->dev.parent = parent;
+
+ ret = amba_device_add(dev);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return dev;
+}
+
+/**
+ * amba_device_alloc - allocate an AMBA device
+ * @name: sysfs name of the AMBA device
+ * @base: base of AMBA device
+ * @size: size of AMBA device
+ *
+ * Allocate and initialize an AMBA device structure. Returns %NULL
+ * on failure.
+ */
+struct amba_device *amba_device_alloc(const char *name, int id, resource_size_t base,
+ size_t size)
+{
+ struct amba_device *dev;
+
+ dev = xzalloc(sizeof(*dev));
+
+ strcpy(dev->dev.name, name);
+ dev->dev.id = id;
+ dev->res.start = base;
+ dev->res.end = base + size - 1;
+ dev->res.flags = IORESOURCE_MEM;
+
+ return dev;
+}
+
diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
new file mode 100644
index 0000000..cb3e3bd
--- /dev/null
+++ b/include/linux/amba/bus.h
@@ -0,0 +1,153 @@
+/*
+ * linux/include/amba/bus.h
+ *
+ * This device type deals with ARM PrimeCells and anything else that
+ * presents a proper CID (0xB105F00D) at the end of the I/O register
+ * region or that is derived from a PrimeCell.
+ *
+ * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
+ *
+ * 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 ASMARM_AMBA_H
+#define ASMARM_AMBA_H
+
+#include <linux/clk.h>
+#include <driver.h>
+#include <linux/err.h>
+
+#define AMBA_CID 0xb105f00d
+
+/**
+ * struct amba_id - identifies a device on an AMBA bus
+ * @id: The significant bits if the hardware device ID
+ * @mask: Bitmask specifying which bits of the id field are significant when
+ * matching. A driver binds to a device when ((hardware device ID) & mask)
+ * == id.
+ * @data: Private data used by the driver.
+ */
+struct amba_id {
+ unsigned int id;
+ unsigned int mask;
+ void *data;
+};
+
+struct clk;
+
+struct amba_device {
+ struct device_d dev;
+ struct resource res;
+ void __iomem *base;
+ struct clk *pclk;
+ unsigned int periphid;
+};
+
+struct amba_driver {
+ struct driver_d drv;
+ int (*probe)(struct amba_device *, const struct amba_id *);
+ int (*remove)(struct amba_device *);
+ const struct amba_id *id_table;
+};
+
+enum amba_vendor {
+ AMBA_VENDOR_ARM = 0x41,
+ AMBA_VENDOR_ST = 0x80,
+};
+
+extern struct bus_type amba_bustype;
+
+#define to_amba_device(d) container_of(d, struct amba_device, dev)
+
+#define amba_get_drvdata(d) dev_get_drvdata(&d->dev)
+#define amba_set_drvdata(d,p) dev_set_drvdata(&d->dev, p)
+
+int amba_driver_register(struct amba_driver *);
+void amba_driver_unregister(struct amba_driver *);
+struct amba_device *amba_device_alloc(const char *, int id, resource_size_t, size_t);
+void amba_device_put(struct amba_device *);
+int amba_device_add(struct amba_device *);
+int amba_device_register(struct amba_device *, struct resource *);
+
+struct amba_device *
+amba_aphb_device_add(struct device_d *parent, const char *name, int id,
+ resource_size_t base, size_t size,
+ void *pdata, unsigned int periphid);
+
+static inline struct amba_device *
+amba_apb_device_add(struct device_d *parent, const char *name, int id,
+ resource_size_t base, size_t size,
+ void *pdata, unsigned int periphid)
+{
+ return amba_aphb_device_add(parent, name, id, base, size, pdata,
+ periphid);
+}
+
+static inline struct amba_device *
+amba_ahb_device_add(struct device_d *parent, const char *name, int id,
+ resource_size_t base, size_t size,
+ void *pdata, unsigned int periphid)
+{
+ return amba_aphb_device_add(parent, name, id, base, size, pdata,
+ periphid);
+}
+
+
+void amba_device_unregister(struct amba_device *);
+struct amba_device *amba_find_device(const char *, struct device_d *, unsigned int, unsigned int);
+int amba_request_regions(struct amba_device *, const char *);
+void amba_release_regions(struct amba_device *);
+
+static inline void __iomem *amba_get_mem_region(struct amba_device *dev)
+{
+ return dev->base;
+}
+
+#define amba_pclk_enable(d) \
+ (IS_ERR((d)->pclk) ? 0 : clk_enable((d)->pclk))
+
+#define amba_pclk_disable(d) \
+ do { if (!IS_ERR((d)->pclk)) clk_disable((d)->pclk); } while (0)
+
+/* Some drivers don't use the struct amba_device */
+#define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff)
+#define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f)
+#define AMBA_MANF_BITS(a) (((a) >> 12) & 0xff)
+#define AMBA_PART_BITS(a) ((a) & 0xfff)
+
+#define amba_config(d) AMBA_CONFIG_BITS((d)->periphid)
+#define amba_rev(d) AMBA_REV_BITS((d)->periphid)
+#define amba_manf(d) AMBA_MANF_BITS((d)->periphid)
+#define amba_part(d) AMBA_PART_BITS((d)->periphid)
+
+#define __AMBA_DEV(busid, data) \
+ { \
+ .init_name = busid, \
+ .platform_data = data, \
+ }
+
+/*
+ * APB devices do not themselves have the ability to address memory,
+ * so DMA masks should be zero (much like USB peripheral devices.)
+ * The DMA controller DMA masks should be used instead (much like
+ * USB host controllers in conventional PCs.)
+ */
+#define AMBA_APB_DEVICE(name, busid, id, base, data) \
+struct amba_device name##_device = { \
+ .dev = __AMBA_DEV(busid, data), \
+ .res = DEFINE_RES_MEM(base, SZ_4K), \
+ .periphid = id, \
+}
+
+/*
+ * AHB devices are DMA capable, so set their DMA masks
+ */
+#define AMBA_AHB_DEVICE(name, busid, id, base, data) \
+struct amba_device name##_device = { \
+ .dev = __AMBA_DEV(busid, data), \
+ .res = DEFINE_RES_MEM(base, SZ_4K), \
+ .periphid = id, \
+}
+
+#endif
--
1.7.10.4
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^ permalink raw reply [flat|nested] 6+ messages in thread
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2012-09-01 10:22 [PATCH 0/3] AMBA Bus support Jean-Christophe PLAGNIOL-VILLARD
2012-09-01 12:36 ` [PATCH 1/3] Introduce ARM AMBA bus Jean-Christophe PLAGNIOL-VILLARD
2012-09-01 12:36 ` [PATCH 2/3] amba-pl011: switch to amba bus Jean-Christophe PLAGNIOL-VILLARD
2012-09-01 12:36 ` [PATCH 3/3] amba-pl011: add st specific init Jean-Christophe PLAGNIOL-VILLARD
2012-09-10 7:25 ` [PATCH 1/3] Introduce ARM AMBA bus Sascha Hauer
2012-09-11 4:47 [PATCH 0/3 v2] AMBA Bus support Jean-Christophe PLAGNIOL-VILLARD
2012-09-11 4:51 ` [PATCH 1/3] Introduce ARM AMBA bus Jean-Christophe PLAGNIOL-VILLARD
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