From 9a8bcabd8adac3382bc23bef450a6793e5144110 Mon Sep 17 00:00:00 2001 From: Mario Six Date: Thu, 9 Aug 2018 14:51:18 +0200 Subject: axi: Add AXI sandbox driver and simple emulator Add test infrastructure and tests for the AXI uclass. Reviewed-by: Simon Glass Signed-off-by: Mario Six --- drivers/axi/Kconfig | 7 +++ drivers/axi/Makefile | 3 ++ drivers/axi/axi-emul-uclass.c | 85 +++++++++++++++++++++++++++++ drivers/axi/axi_sandbox.c | 77 ++++++++++++++++++++++++++ drivers/axi/sandbox_store.c | 123 ++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 295 insertions(+) create mode 100644 drivers/axi/axi-emul-uclass.c create mode 100644 drivers/axi/axi_sandbox.c create mode 100644 drivers/axi/sandbox_store.c (limited to 'drivers/axi') diff --git a/drivers/axi/Kconfig b/drivers/axi/Kconfig index ae80c98af8..f81d843f89 100644 --- a/drivers/axi/Kconfig +++ b/drivers/axi/Kconfig @@ -22,4 +22,11 @@ config IHS_AXI Interface (IHS AXI) bus on a gdsys IHS FPGA used to communicate with IP cores in the FPGA (e.g. video transmitter cores). +config AXI_SANDBOX + bool "Enable AXI sandbox driver" + depends on DM + help + Support AXI (Advanced eXtensible Interface) emulation for the sandbox + environment. + endif diff --git a/drivers/axi/Makefile b/drivers/axi/Makefile index 18d9380e9b..66b6c5a28f 100644 --- a/drivers/axi/Makefile +++ b/drivers/axi/Makefile @@ -7,3 +7,6 @@ obj-$(CONFIG_AXI) += axi-uclass.o obj-$(CONFIG_IHS_AXI) += ihs_axi.o +obj-$(CONFIG_SANDBOX) += axi-emul-uclass.o +obj-$(CONFIG_SANDBOX) += sandbox_store.o +obj-$(CONFIG_AXI_SANDBOX) += axi_sandbox.o diff --git a/drivers/axi/axi-emul-uclass.c b/drivers/axi/axi-emul-uclass.c new file mode 100644 index 0000000000..06c42006ee --- /dev/null +++ b/drivers/axi/axi-emul-uclass.c @@ -0,0 +1,85 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2018 + * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc + */ + +#include +#include +#include +#include +#include + +int axi_sandbox_get_emul(struct udevice *bus, ulong address, + enum axi_size_t size, struct udevice **emulp) +{ + struct udevice *dev; + u32 reg[2]; + uint offset; + + switch (size) { + case AXI_SIZE_8: + offset = 1; + break; + case AXI_SIZE_16: + offset = 2; + break; + case AXI_SIZE_32: + offset = 4; + break; + default: + debug("%s: Unknown AXI transfer size '%d'", bus->name, size); + offset = 0; + } + + /* + * Note: device_find_* don't activate the devices; they're activated + * as-needed below. + */ + for (device_find_first_child(bus, &dev); + dev; + device_find_next_child(&dev)) { + int ret; + + ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg)); + if (ret) { + debug("%s: Could not read 'reg' property of %s\n", + bus->name, dev->name); + continue; + } + + /* + * Does the transfer's address fall into this device's address + * space? + */ + if (address >= reg[0] && address <= reg[0] + reg[1] - offset) { + /* If yes, activate it... */ + if (device_probe(dev)) { + debug("%s: Could not activate %s\n", + bus->name, dev->name); + return -ENODEV; + } + + /* ...and return it */ + *emulp = dev; + return 0; + } + } + + return -ENODEV; +} + +int axi_get_store(struct udevice *dev, u8 **storep) +{ + struct axi_emul_ops *ops = axi_emul_get_ops(dev); + + if (!ops->get_store) + return -ENOSYS; + + return ops->get_store(dev, storep); +} + +UCLASS_DRIVER(axi_emul) = { + .id = UCLASS_AXI_EMUL, + .name = "axi_emul", +}; diff --git a/drivers/axi/axi_sandbox.c b/drivers/axi/axi_sandbox.c new file mode 100644 index 0000000000..b91c91f6b3 --- /dev/null +++ b/drivers/axi/axi_sandbox.c @@ -0,0 +1,77 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2018 + * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc + */ + +#include +#include +#include +#include + +/* + * This driver implements a AXI bus for the sandbox architecture for testing + * purposes. + * + * The bus forwards every access to it to a special AXI emulation device (which + * it gets via the axi_emul_get_ops function) that implements a simple + * read/write storage. + * + * The emulator device must still be contained in the device tree in the usual + * way, since configuration data for the storage is read from the DT. + */ + +static int axi_sandbox_read(struct udevice *bus, ulong address, void *data, + enum axi_size_t size) +{ + struct axi_emul_ops *ops; + struct udevice *emul; + int ret; + + /* Get emulator device */ + ret = axi_sandbox_get_emul(bus, address, size, &emul); + if (ret) + return ret == -ENODEV ? 0 : ret; + /* Forward all reads to the AXI emulator */ + ops = axi_emul_get_ops(emul); + if (!ops || !ops->read) + return -ENOSYS; + + return ops->read(emul, address, data, size); +} + +static int axi_sandbox_write(struct udevice *bus, ulong address, void *data, + enum axi_size_t size) +{ + struct axi_emul_ops *ops; + struct udevice *emul; + int ret; + + /* Get emulator device */ + ret = axi_sandbox_get_emul(bus, address, size, &emul); + if (ret) + return ret == -ENODEV ? 0 : ret; + /* Forward all writes to the AXI emulator */ + ops = axi_emul_get_ops(emul); + if (!ops || !ops->write) + return -ENOSYS; + + return ops->write(emul, address, data, size); +} + +static const struct udevice_id axi_sandbox_ids[] = { + { .compatible = "sandbox,axi" }, + { /* sentinel */ } +}; + +static const struct axi_ops axi_sandbox_ops = { + .read = axi_sandbox_read, + .write = axi_sandbox_write, +}; + +U_BOOT_DRIVER(axi_sandbox_bus) = { + .name = "axi_sandbox_bus", + .id = UCLASS_AXI, + .of_match = axi_sandbox_ids, + .ops = &axi_sandbox_ops, +}; diff --git a/drivers/axi/sandbox_store.c b/drivers/axi/sandbox_store.c new file mode 100644 index 0000000000..d724f19079 --- /dev/null +++ b/drivers/axi/sandbox_store.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2018 + * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc + */ + +#include +#include +#include + +/** + * struct sandbox_store_priv - Private data structure of a AXI store device + * @store: The buffer holding the device's internal memory, which is read from + * and written to using the driver's methods + */ +struct sandbox_store_priv { + u8 *store; +}; + +/** + * copy_axi_data() - Copy data from source to destination with a given AXI + * transfer width + * @src: Pointer to the data source from where data will be read + * @dst: Pointer to the data destination where data will be written to + * @size: Size of the data to be copied given by a axi_size_t enum value + * + * Return: 0 if OK, -ve on error + */ +static int copy_axi_data(void *src, void *dst, enum axi_size_t size) +{ + switch (size) { + case AXI_SIZE_8: + *((u8 *)dst) = *((u8 *)src); + return 0; + case AXI_SIZE_16: + *((u16 *)dst) = be16_to_cpu(*((u16 *)src)); + return 0; + case AXI_SIZE_32: + *((u32 *)dst) = be32_to_cpu(*((u32 *)src)); + return 0; + default: + debug("%s: Unknown AXI transfer size '%d'\n", __func__, size); + return -EINVAL; + } +} + +static int sandbox_store_read(struct udevice *dev, ulong address, void *data, + enum axi_size_t size) +{ + struct sandbox_store_priv *priv = dev_get_priv(dev); + + return copy_axi_data(priv->store + address, data, size); +} + +static int sandbox_store_write(struct udevice *dev, ulong address, void *data, + enum axi_size_t size) +{ + struct sandbox_store_priv *priv = dev_get_priv(dev); + + return copy_axi_data(data, priv->store + address, size); +} + +static int sandbox_store_get_store(struct udevice *dev, u8 **store) +{ + struct sandbox_store_priv *priv = dev_get_priv(dev); + + *store = priv->store; + + return 0; +} + +static const struct udevice_id sandbox_store_ids[] = { + { .compatible = "sandbox,sandbox_store" }, + { /* sentinel */ } +}; + +static const struct axi_emul_ops sandbox_store_ops = { + .read = sandbox_store_read, + .write = sandbox_store_write, + .get_store = sandbox_store_get_store, +}; + +static int sandbox_store_probe(struct udevice *dev) +{ + struct sandbox_store_priv *priv = dev_get_priv(dev); + u32 reg[2]; + int ret; + + ret = dev_read_u32_array(dev, "reg", reg, ARRAY_SIZE(reg)); + if (ret) { + debug("%s: Could not read 'reg' property\n", dev->name); + return -EINVAL; + } + + /* + * Allocate the device's internal storage that will be read + * from/written to + */ + priv->store = calloc(reg[1], 1); + if (!priv->store) + return -ENOMEM; + + return 0; +} + +static int sandbox_store_remove(struct udevice *dev) +{ + struct sandbox_store_priv *priv = dev_get_priv(dev); + + free(priv->store); + + return 0; +} + +U_BOOT_DRIVER(sandbox_axi_store) = { + .name = "sandbox_axi_store", + .id = UCLASS_AXI_EMUL, + .of_match = sandbox_store_ids, + .ops = &sandbox_store_ops, + .priv_auto_alloc_size = sizeof(struct sandbox_store_priv), + .probe = sandbox_store_probe, + .remove = sandbox_store_remove, +}; -- cgit v1.2.3