[U-Boot] [PATCH v2 14/22] dm: sandbox: pci: Add PCI support for sandbox
Simon Glass
sjg at chromium.org
Thu Mar 5 20:25:26 CET 2015
Add the required header information, device tree nodes and I/O accessor
functions to support PCI on sandbox. All devices are emulated by drivers
which can be added as required for testing or development.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v2: None
arch/sandbox/Kconfig | 7 ++
arch/sandbox/cpu/cpu.c | 37 +++++++-
arch/sandbox/dts/sandbox.dts | 20 +++++
arch/sandbox/include/asm/io.h | 16 +++-
arch/sandbox/include/asm/processor.h | 12 +++
arch/sandbox/include/asm/test.h | 7 +-
arch/sandbox/include/asm/u-boot-sandbox.h | 48 +++++++++++
arch/sandbox/lib/Makefile | 2 +-
arch/sandbox/lib/pci_io.c | 138 ++++++++++++++++++++++++++++++
9 files changed, 280 insertions(+), 7 deletions(-)
create mode 100644 arch/sandbox/include/asm/processor.h
create mode 100644 arch/sandbox/lib/pci_io.c
diff --git a/arch/sandbox/Kconfig b/arch/sandbox/Kconfig
index 2098b9c..477a20a 100644
--- a/arch/sandbox/Kconfig
+++ b/arch/sandbox/Kconfig
@@ -34,4 +34,11 @@ config DM_I2C
config DM_TEST
default y
+config PCI
+ bool "PCI support"
+ help
+ Enable support for PCI (Peripheral Interconnect Bus), a type of bus
+ used on some devices to allow the CPU to communicate with its
+ peripherals.
+
endmenu
diff --git a/arch/sandbox/cpu/cpu.c b/arch/sandbox/cpu/cpu.c
index 1aa397c..1e67a31 100644
--- a/arch/sandbox/cpu/cpu.c
+++ b/arch/sandbox/cpu/cpu.c
@@ -2,7 +2,7 @@
* Copyright (c) 2011 The Chromium OS Authors.
* SPDX-License-Identifier: GPL-2.0+
*/
-
+#define DEBUG
#include <common.h>
#include <dm/root.h>
#include <os.h>
@@ -10,6 +10,13 @@
DECLARE_GLOBAL_DATA_PTR;
+/* Enable access to PCI memory with map_sysmem() */
+static bool enable_pci_map;
+
+/* Last device that was mapped into memory, and length of mapping */
+static struct udevice *map_dev;
+unsigned long map_len;
+
void reset_cpu(ulong ignored)
{
if (state_uninit())
@@ -59,9 +66,37 @@ int cleanup_before_linux(void)
void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
{
+#ifdef CONFIG_PCI
+ unsigned long plen = len;
+ void *ptr;
+
+ map_dev = NULL;
+ if (enable_pci_map && !pci_map_physmem(paddr, &len, &map_dev, &ptr)) {
+ if (plen != len) {
+ printf("%s: Warning: partial map at %x, wanted %lx, got %lx\n",
+ __func__, paddr, len, plen);
+ }
+ map_len = len;
+ return ptr;
+ }
+#endif
+
return (void *)(gd->arch.ram_buf + paddr);
}
+void unmap_physmem(const void *vaddr, unsigned long flags)
+{
+ if (map_dev) {
+ pci_unmap_physmem(vaddr, map_len, map_dev);
+ map_dev = NULL;
+ }
+}
+
+void sandbox_set_enable_pci_map(int enable)
+{
+ enable_pci_map = enable;
+}
+
phys_addr_t map_to_sysmem(const void *ptr)
{
return (u8 *)ptr - gd->arch.ram_buf;
diff --git a/arch/sandbox/dts/sandbox.dts b/arch/sandbox/dts/sandbox.dts
index d090ba8..42a1f21 100644
--- a/arch/sandbox/dts/sandbox.dts
+++ b/arch/sandbox/dts/sandbox.dts
@@ -4,6 +4,10 @@
#address-cells = <1>;
#size-cells = <1>;
+ aliases {
+ pci0 = &pci;
+ };
+
chosen {
stdout-path = "/serial";
};
@@ -181,4 +185,20 @@
};
};
+ pci: pci-controller {
+ compatible = "sandbox,pci";
+ device_type = "pci";
+ #address-cells = <3>;
+ #size-cells = <2>;
+ ranges = <0x02000000 0 0x10000000 0x10000000 0 0x2000
+ 0x01000000 0 0x20000000 0x20000000 0 0x2000>;
+ pci at 1f,0 {
+ compatible = "pci-generic";
+ reg = <0xf800 0 0 0 0>;
+ emul at 1f,0 {
+ compatible = "sandbox,swap-case";
+ };
+ };
+ };
+
};
diff --git a/arch/sandbox/include/asm/io.h b/arch/sandbox/include/asm/io.h
index 895fcb8..5b87fde 100644
--- a/arch/sandbox/include/asm/io.h
+++ b/arch/sandbox/include/asm/io.h
@@ -22,10 +22,7 @@ void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags);
/*
* Take down a mapping set up by map_physmem().
*/
-static inline void unmap_physmem(void *vaddr, unsigned long flags)
-{
-
-}
+void unmap_physmem(const void *vaddr, unsigned long flags);
/* For sandbox, we want addresses to point into our RAM buffer */
static inline void *map_sysmem(phys_addr_t paddr, unsigned long len)
@@ -33,8 +30,10 @@ static inline void *map_sysmem(phys_addr_t paddr, unsigned long len)
return map_physmem(paddr, len, MAP_WRBACK);
}
+/* Remove a previous mapping */
static inline void unmap_sysmem(const void *vaddr)
{
+ unmap_physmem(vaddr, MAP_WRBACK);
}
/* Map from a pointer to our RAM buffer */
@@ -48,6 +47,15 @@ phys_addr_t map_to_sysmem(const void *ptr);
#define writew(v, addr)
#define writel(v, addr)
+/* I/O access functions */
+int inl(unsigned int addr);
+int inw(unsigned int addr);
+int inb(unsigned int addr);
+
+void outl(unsigned int value, unsigned int addr);
+void outw(unsigned int value, unsigned int addr);
+void outb(unsigned int value, unsigned int addr);
+
#include <iotrace.h>
#endif
diff --git a/arch/sandbox/include/asm/processor.h b/arch/sandbox/include/asm/processor.h
new file mode 100644
index 0000000..3c1794e
--- /dev/null
+++ b/arch/sandbox/include/asm/processor.h
@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _ASM_PROCESSOR_H
+#define _ASM_PROCESSOR_H
+
+/* This file is required for PCI */
+
+#endif
diff --git a/arch/sandbox/include/asm/test.h b/arch/sandbox/include/asm/test.h
index 25a0c85..8e490e9 100644
--- a/arch/sandbox/include/asm/test.h
+++ b/arch/sandbox/include/asm/test.h
@@ -10,7 +10,12 @@
#define __ASM_TEST_H
/* The sandbox driver always permits an I2C device with this address */
-#define SANDBOX_I2C_TEST_ADDR 0x59
+#define SANDBOX_I2C_TEST_ADDR 0x59
+
+#define SANDBOX_PCI_VENDOR_ID 0x1234
+#define SANDBOX_PCI_DEVICE_ID 0x5678
+#define SANDBOX_PCI_CLASS_CODE PCI_CLASS_CODE_COMM
+#define SANDBOX_PCI_CLASS_SUB_CODE PCI_CLASS_SUB_CODE_COMM_SERIAL
enum sandbox_i2c_eeprom_test_mode {
SIE_TEST_MODE_NONE,
diff --git a/arch/sandbox/include/asm/u-boot-sandbox.h b/arch/sandbox/include/asm/u-boot-sandbox.h
index 770ab5c..d5b9361 100644
--- a/arch/sandbox/include/asm/u-boot-sandbox.h
+++ b/arch/sandbox/include/asm/u-boot-sandbox.h
@@ -27,4 +27,52 @@ int cleanup_before_linux(void);
/* drivers/video/sandbox_sdl.c */
int sandbox_lcd_sdl_early_init(void);
+/**
+ * pci_map_physmem() - map a PCI device into memory
+ *
+ * This is used on sandbox to map a device into memory so that it can be
+ * used with normal memory access. After this call, some part of the device's
+ * internal structure becomes visible.
+ *
+ * This function is normally called from sandbox's map_sysmem() automatically.
+ *
+ * @paddr: Physical memory address, normally corresponding to a PCI BAR
+ * @lenp: On entry, the size of the area to map, On exit it is updated
+ * to the size actually mapped, which may be less if the device
+ * has less space
+ * @devp: Returns the device which mapped into this space
+ * @ptrp: Returns a pointer to the mapped address. The device's space
+ * can be accessed as @lenp bytes starting here
+ * @return 0 if OK, -ve on error
+ */
+int pci_map_physmem(phys_addr_t paddr, unsigned long *lenp,
+ struct udevice **devp, void **ptrp);
+
+/**
+ * pci_unmap_physmem() - undo a memory mapping
+ *
+ * This must be called after pci_map_physmem() to undo the mapping.
+ *
+ * @paddr: Physical memory address, as passed to pci_map_physmem()
+ * @len: Size of area mapped, as returned by pci_map_physmem()
+ * @dev: Device to unmap, as returned by pci_map_physmem()
+ * @return 0 if OK, -ve on error
+ */
+int pci_unmap_physmem(const void *addr, unsigned long len,
+ struct udevice *dev);
+
+/**
+ * sandbox_set_enable_pci_map() - Enable / disable PCI address mapping
+ *
+ * Since address mapping involves calling every driver, provide a way to
+ * enable and disable this. It can be handled automatically by the emulator
+ * uclass, which knows if any emulators are currently active.
+ *
+ * If this is disabled, pci_map_physmem() will not be called from
+ * map_sysmem().
+ *
+ * @enable: 0 to disable, 1 to enable
+ */
+void sandbox_set_enable_pci_map(int enable);
+
#endif /* _U_BOOT_SANDBOX_H_ */
diff --git a/arch/sandbox/lib/Makefile b/arch/sandbox/lib/Makefile
index 4c1a38d..75b135c 100644
--- a/arch/sandbox/lib/Makefile
+++ b/arch/sandbox/lib/Makefile
@@ -7,5 +7,5 @@
# SPDX-License-Identifier: GPL-2.0+
#
-
obj-y += interrupts.o
+obj-$(CONFIG_PCI) += pci_io.o
diff --git a/arch/sandbox/lib/pci_io.c b/arch/sandbox/lib/pci_io.c
new file mode 100644
index 0000000..0de124f
--- /dev/null
+++ b/arch/sandbox/lib/pci_io.c
@@ -0,0 +1,138 @@
+/*
+ * Copyright (c) 2014 Google, Inc
+ * Written by Simon Glass <sjg at chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/*
+ * IO space access commands.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <asm/io.h>
+
+int pci_map_physmem(phys_addr_t paddr, unsigned long *lenp,
+ struct udevice **devp, void **ptrp)
+{
+ struct udevice *dev;
+ int ret;
+
+ *ptrp = 0;
+ for (uclass_first_device(UCLASS_PCI_EMUL, &dev);
+ dev;
+ uclass_next_device(&dev)) {
+ struct dm_pci_emul_ops *ops = pci_get_emul_ops(dev);
+
+ if (!ops || !ops->map_physmem)
+ continue;
+ ret = (ops->map_physmem)(dev, paddr, lenp, ptrp);
+ if (ret)
+ continue;
+ *devp = dev;
+ return 0;
+ }
+
+ debug("%s: failed: addr=%x\n", __func__, paddr);
+ return -ENOSYS;
+}
+
+int pci_unmap_physmem(const void *vaddr, unsigned long len,
+ struct udevice *dev)
+{
+ struct dm_pci_emul_ops *ops = pci_get_emul_ops(dev);
+
+ if (!ops || !ops->unmap_physmem)
+ return -ENOSYS;
+ return (ops->unmap_physmem)(dev, vaddr, len);
+}
+
+static int pci_io_read(unsigned int addr, ulong *valuep, pci_size_t size)
+{
+ struct udevice *dev;
+ int ret;
+
+ *valuep = pci_get_ff(size);
+ for (uclass_first_device(UCLASS_PCI_EMUL, &dev);
+ dev;
+ uclass_next_device(&dev)) {
+ struct dm_pci_emul_ops *ops = pci_get_emul_ops(dev);
+
+ if (ops && ops->read_io) {
+ ret = (ops->read_io)(dev, addr, valuep, size);
+ if (!ret)
+ return 0;
+ }
+ }
+
+ debug("%s: failed: addr=%x\n", __func__, addr);
+ return -ENOSYS;
+}
+
+static int pci_io_write(unsigned int addr, ulong value, pci_size_t size)
+{
+ struct udevice *dev;
+ int ret;
+
+ for (uclass_first_device(UCLASS_PCI_EMUL, &dev);
+ dev;
+ uclass_next_device(&dev)) {
+ struct dm_pci_emul_ops *ops = pci_get_emul_ops(dev);
+
+ if (ops && ops->write_io) {
+ ret = (ops->write_io)(dev, addr, value, size);
+ if (!ret)
+ return 0;
+ }
+ }
+
+ debug("%s: failed: addr=%x, value=%lx\n", __func__, addr, value);
+ return -ENOSYS;
+}
+
+int inl(unsigned int addr)
+{
+ unsigned long value;
+ int ret;
+
+ ret = pci_io_read(addr, &value, PCI_SIZE_32);
+
+ return ret ? 0 : value;
+}
+
+int inw(unsigned int addr)
+{
+ unsigned long value;
+ int ret;
+
+ ret = pci_io_read(addr, &value, PCI_SIZE_16);
+
+ return ret ? 0 : value;
+}
+
+int inb(unsigned int addr)
+{
+ unsigned long value;
+ int ret;
+
+ ret = pci_io_read(addr, &value, PCI_SIZE_8);
+
+ return ret ? 0 : value;
+}
+
+void outl(unsigned int value, unsigned int addr)
+{
+ pci_io_write(addr, value, PCI_SIZE_32);
+}
+
+void outw(unsigned int value, unsigned int addr)
+{
+ pci_io_write(addr, value, PCI_SIZE_16);
+}
+
+void outb(unsigned int value, unsigned int addr)
+{
+ pci_io_write(addr, value, PCI_SIZE_8);
+}
--
2.2.0.rc0.207.ga3a616c
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