Commit d2cb9b2b authored by Simon Glass's avatar Simon Glass
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dm: sandbox: Add a emulated PCI device as an example



This device sits on the sandbox PCI bus and provides a case-swapping
service for sandbox. It illustrates the use of both PCI I/O and PCI
memory accesses.
Signed-off-by: default avatarSimon Glass <sjg@chromium.org>
parent 36d0d3b4
/*
* PCI emulation device which swaps the case of text
*
* Copyright (c) 2014 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <pci.h>
#include <asm/test.h>
#include <linux/ctype.h>
/**
* struct swap_case_platdata - platform data for this device
*
* @command: Current PCI command value
* @bar: Current base address values
*/
struct swap_case_platdata {
u16 command;
u32 bar[2];
};
#define offset_to_barnum(offset) \
(((offset) - PCI_BASE_ADDRESS_0) / sizeof(u32))
enum {
MEM_TEXT_SIZE = 0x100,
};
enum swap_case_op {
OP_TO_LOWER,
OP_TO_UPPER,
OP_SWAP,
};
static struct pci_bar {
int type;
u32 size;
} barinfo[] = {
{ PCI_BASE_ADDRESS_SPACE_IO, 1 },
{ PCI_BASE_ADDRESS_MEM_TYPE_32, MEM_TEXT_SIZE },
{ 0, 0 },
{ 0, 0 },
{ 0, 0 },
{ 0, 0 },
};
struct swap_case_priv {
enum swap_case_op op;
char mem_text[MEM_TEXT_SIZE];
};
static int sandbox_swap_case_get_devfn(struct udevice *dev)
{
struct pci_child_platdata *plat = dev_get_parent_platdata(dev);
return plat->devfn;
}
static int sandbox_swap_case_read_config(struct udevice *emul, uint offset,
ulong *valuep, enum pci_size_t size)
{
struct swap_case_platdata *plat = dev_get_platdata(emul);
switch (offset) {
case PCI_COMMAND:
*valuep = plat->command;
break;
case PCI_HEADER_TYPE:
*valuep = 0;
break;
case PCI_VENDOR_ID:
*valuep = SANDBOX_PCI_VENDOR_ID;
break;
case PCI_DEVICE_ID:
*valuep = SANDBOX_PCI_DEVICE_ID;
break;
case PCI_CLASS_DEVICE:
if (size == PCI_SIZE_8) {
*valuep = SANDBOX_PCI_CLASS_SUB_CODE;
} else {
*valuep = (SANDBOX_PCI_CLASS_CODE << 8) |
SANDBOX_PCI_CLASS_SUB_CODE;
}
break;
case PCI_CLASS_CODE:
*valuep = SANDBOX_PCI_CLASS_CODE;
break;
case PCI_BASE_ADDRESS_0:
case PCI_BASE_ADDRESS_1:
case PCI_BASE_ADDRESS_2:
case PCI_BASE_ADDRESS_3:
case PCI_BASE_ADDRESS_4:
case PCI_BASE_ADDRESS_5: {
int barnum;
u32 *bar, result;
barnum = offset_to_barnum(offset);
bar = &plat->bar[barnum];
result = *bar;
if (*bar == 0xffffffff) {
if (barinfo[barnum].type) {
result = (~(barinfo[barnum].size - 1) &
PCI_BASE_ADDRESS_IO_MASK) |
PCI_BASE_ADDRESS_SPACE_IO;
} else {
result = (~(barinfo[barnum].size - 1) &
PCI_BASE_ADDRESS_MEM_MASK) |
PCI_BASE_ADDRESS_MEM_TYPE_32;
}
}
debug("r bar %d=%x\n", barnum, result);
*valuep = result;
break;
}
}
return 0;
}
static int sandbox_swap_case_write_config(struct udevice *emul, uint offset,
ulong value, enum pci_size_t size)
{
struct swap_case_platdata *plat = dev_get_platdata(emul);
switch (offset) {
case PCI_COMMAND:
plat->command = value;
break;
case PCI_BASE_ADDRESS_0:
case PCI_BASE_ADDRESS_1: {
int barnum;
u32 *bar;
barnum = offset_to_barnum(offset);
bar = &plat->bar[barnum];
debug("w bar %d=%lx\n", barnum, value);
*bar = value;
break;
}
}
return 0;
}
static int sandbox_swap_case_find_bar(struct udevice *emul, unsigned int addr,
int *barnump, unsigned int *offsetp)
{
struct swap_case_platdata *plat = dev_get_platdata(emul);
int barnum;
for (barnum = 0; barnum < ARRAY_SIZE(barinfo); barnum++) {
unsigned int size = barinfo[barnum].size;
if (addr >= plat->bar[barnum] &&
addr < plat->bar[barnum] + size) {
*barnump = barnum;
*offsetp = addr - plat->bar[barnum];
return 0;
}
}
*barnump = -1;
return -ENOENT;
}
static void sandbox_swap_case_do_op(enum swap_case_op op, char *str, int len)
{
for (; len > 0; len--, str++) {
switch (op) {
case OP_TO_UPPER:
*str = toupper(*str);
break;
case OP_TO_LOWER:
*str = tolower(*str);
break;
case OP_SWAP:
if (isupper(*str))
*str = tolower(*str);
else
*str = toupper(*str);
break;
}
}
}
int sandbox_swap_case_read_io(struct udevice *dev, unsigned int addr,
ulong *valuep, enum pci_size_t size)
{
struct swap_case_priv *priv = dev_get_priv(dev);
unsigned int offset;
int barnum;
int ret;
ret = sandbox_swap_case_find_bar(dev, addr, &barnum, &offset);
if (ret)
return ret;
if (barnum == 0 && offset == 0)
*valuep = (*valuep & ~0xff) | priv->op;
return 0;
}
int sandbox_swap_case_write_io(struct udevice *dev, unsigned int addr,
ulong value, enum pci_size_t size)
{
struct swap_case_priv *priv = dev_get_priv(dev);
unsigned int offset;
int barnum;
int ret;
ret = sandbox_swap_case_find_bar(dev, addr, &barnum, &offset);
if (ret)
return ret;
if (barnum == 0 && offset == 0)
priv->op = value;
return 0;
}
static int sandbox_swap_case_map_physmem(struct udevice *dev,
phys_addr_t addr, unsigned long *lenp, void **ptrp)
{
struct swap_case_priv *priv = dev_get_priv(dev);
unsigned int offset, avail;
int barnum;
int ret;
ret = sandbox_swap_case_find_bar(dev, addr, &barnum, &offset);
if (ret)
return ret;
if (barnum == 1) {
*ptrp = priv->mem_text + offset;
avail = barinfo[1].size - offset;
if (avail > barinfo[1].size)
*lenp = 0;
else
*lenp = min(*lenp, (ulong)avail);
return 0;
}
return -ENOENT;
}
static int sandbox_swap_case_unmap_physmem(struct udevice *dev,
const void *vaddr, unsigned long len)
{
struct swap_case_priv *priv = dev_get_priv(dev);
sandbox_swap_case_do_op(priv->op, (void *)vaddr, len);
return 0;
}
struct dm_pci_emul_ops sandbox_swap_case_emul_ops = {
.get_devfn = sandbox_swap_case_get_devfn,
.read_config = sandbox_swap_case_read_config,
.write_config = sandbox_swap_case_write_config,
.read_io = sandbox_swap_case_read_io,
.write_io = sandbox_swap_case_write_io,
.map_physmem = sandbox_swap_case_map_physmem,
.unmap_physmem = sandbox_swap_case_unmap_physmem,
};
static const struct udevice_id sandbox_swap_case_ids[] = {
{ .compatible = "sandbox,swap-case" },
{ }
};
U_BOOT_DRIVER(sandbox_swap_case_emul) = {
.name = "sandbox_swap_case_emul",
.id = UCLASS_PCI_EMUL,
.of_match = sandbox_swap_case_ids,
.ops = &sandbox_swap_case_emul_ops,
.priv_auto_alloc_size = sizeof(struct swap_case_priv),
.platdata_auto_alloc_size = sizeof(struct swap_case_platdata),
};
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