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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: Simon Glass <sjg@chromium.org>
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Simon Glass
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36d0d3b4b4
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285
drivers/misc/swap_case.c
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285
drivers/misc/swap_case.c
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/*
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* PCI emulation device which swaps the case of text
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*
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* Copyright (c) 2014 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <pci.h>
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#include <asm/test.h>
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#include <linux/ctype.h>
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/**
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* struct swap_case_platdata - platform data for this device
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*
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* @command: Current PCI command value
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* @bar: Current base address values
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*/
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struct swap_case_platdata {
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u16 command;
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u32 bar[2];
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};
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#define offset_to_barnum(offset) \
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(((offset) - PCI_BASE_ADDRESS_0) / sizeof(u32))
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enum {
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MEM_TEXT_SIZE = 0x100,
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};
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enum swap_case_op {
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OP_TO_LOWER,
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OP_TO_UPPER,
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OP_SWAP,
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};
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static struct pci_bar {
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int type;
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u32 size;
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} barinfo[] = {
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{ PCI_BASE_ADDRESS_SPACE_IO, 1 },
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{ PCI_BASE_ADDRESS_MEM_TYPE_32, MEM_TEXT_SIZE },
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{ 0, 0 },
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{ 0, 0 },
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{ 0, 0 },
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{ 0, 0 },
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};
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struct swap_case_priv {
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enum swap_case_op op;
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char mem_text[MEM_TEXT_SIZE];
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};
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static int sandbox_swap_case_get_devfn(struct udevice *dev)
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{
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struct pci_child_platdata *plat = dev_get_parent_platdata(dev);
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return plat->devfn;
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}
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static int sandbox_swap_case_read_config(struct udevice *emul, uint offset,
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ulong *valuep, enum pci_size_t size)
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{
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struct swap_case_platdata *plat = dev_get_platdata(emul);
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switch (offset) {
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case PCI_COMMAND:
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*valuep = plat->command;
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break;
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case PCI_HEADER_TYPE:
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*valuep = 0;
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break;
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case PCI_VENDOR_ID:
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*valuep = SANDBOX_PCI_VENDOR_ID;
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break;
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case PCI_DEVICE_ID:
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*valuep = SANDBOX_PCI_DEVICE_ID;
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break;
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case PCI_CLASS_DEVICE:
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if (size == PCI_SIZE_8) {
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*valuep = SANDBOX_PCI_CLASS_SUB_CODE;
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} else {
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*valuep = (SANDBOX_PCI_CLASS_CODE << 8) |
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SANDBOX_PCI_CLASS_SUB_CODE;
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}
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break;
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case PCI_CLASS_CODE:
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*valuep = SANDBOX_PCI_CLASS_CODE;
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break;
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case PCI_BASE_ADDRESS_0:
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case PCI_BASE_ADDRESS_1:
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case PCI_BASE_ADDRESS_2:
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case PCI_BASE_ADDRESS_3:
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case PCI_BASE_ADDRESS_4:
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case PCI_BASE_ADDRESS_5: {
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int barnum;
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u32 *bar, result;
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barnum = offset_to_barnum(offset);
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bar = &plat->bar[barnum];
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result = *bar;
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if (*bar == 0xffffffff) {
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if (barinfo[barnum].type) {
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result = (~(barinfo[barnum].size - 1) &
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PCI_BASE_ADDRESS_IO_MASK) |
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PCI_BASE_ADDRESS_SPACE_IO;
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} else {
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result = (~(barinfo[barnum].size - 1) &
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PCI_BASE_ADDRESS_MEM_MASK) |
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PCI_BASE_ADDRESS_MEM_TYPE_32;
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}
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}
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debug("r bar %d=%x\n", barnum, result);
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*valuep = result;
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break;
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}
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}
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return 0;
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}
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static int sandbox_swap_case_write_config(struct udevice *emul, uint offset,
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ulong value, enum pci_size_t size)
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{
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struct swap_case_platdata *plat = dev_get_platdata(emul);
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switch (offset) {
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case PCI_COMMAND:
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plat->command = value;
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break;
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case PCI_BASE_ADDRESS_0:
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case PCI_BASE_ADDRESS_1: {
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int barnum;
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u32 *bar;
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barnum = offset_to_barnum(offset);
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bar = &plat->bar[barnum];
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debug("w bar %d=%lx\n", barnum, value);
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*bar = value;
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break;
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}
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}
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return 0;
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}
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static int sandbox_swap_case_find_bar(struct udevice *emul, unsigned int addr,
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int *barnump, unsigned int *offsetp)
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{
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struct swap_case_platdata *plat = dev_get_platdata(emul);
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int barnum;
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for (barnum = 0; barnum < ARRAY_SIZE(barinfo); barnum++) {
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unsigned int size = barinfo[barnum].size;
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if (addr >= plat->bar[barnum] &&
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addr < plat->bar[barnum] + size) {
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*barnump = barnum;
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*offsetp = addr - plat->bar[barnum];
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return 0;
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}
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}
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*barnump = -1;
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return -ENOENT;
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}
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static void sandbox_swap_case_do_op(enum swap_case_op op, char *str, int len)
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{
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for (; len > 0; len--, str++) {
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switch (op) {
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case OP_TO_UPPER:
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*str = toupper(*str);
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break;
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case OP_TO_LOWER:
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*str = tolower(*str);
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break;
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case OP_SWAP:
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if (isupper(*str))
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*str = tolower(*str);
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else
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*str = toupper(*str);
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break;
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}
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}
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}
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int sandbox_swap_case_read_io(struct udevice *dev, unsigned int addr,
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ulong *valuep, enum pci_size_t size)
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{
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struct swap_case_priv *priv = dev_get_priv(dev);
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unsigned int offset;
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int barnum;
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int ret;
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ret = sandbox_swap_case_find_bar(dev, addr, &barnum, &offset);
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if (ret)
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return ret;
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if (barnum == 0 && offset == 0)
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*valuep = (*valuep & ~0xff) | priv->op;
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return 0;
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}
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int sandbox_swap_case_write_io(struct udevice *dev, unsigned int addr,
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ulong value, enum pci_size_t size)
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{
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struct swap_case_priv *priv = dev_get_priv(dev);
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unsigned int offset;
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int barnum;
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int ret;
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ret = sandbox_swap_case_find_bar(dev, addr, &barnum, &offset);
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if (ret)
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return ret;
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if (barnum == 0 && offset == 0)
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priv->op = value;
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return 0;
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}
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static int sandbox_swap_case_map_physmem(struct udevice *dev,
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phys_addr_t addr, unsigned long *lenp, void **ptrp)
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{
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struct swap_case_priv *priv = dev_get_priv(dev);
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unsigned int offset, avail;
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int barnum;
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int ret;
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ret = sandbox_swap_case_find_bar(dev, addr, &barnum, &offset);
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if (ret)
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return ret;
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if (barnum == 1) {
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*ptrp = priv->mem_text + offset;
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avail = barinfo[1].size - offset;
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if (avail > barinfo[1].size)
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*lenp = 0;
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else
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*lenp = min(*lenp, (ulong)avail);
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return 0;
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}
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return -ENOENT;
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}
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static int sandbox_swap_case_unmap_physmem(struct udevice *dev,
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const void *vaddr, unsigned long len)
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{
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struct swap_case_priv *priv = dev_get_priv(dev);
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sandbox_swap_case_do_op(priv->op, (void *)vaddr, len);
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return 0;
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}
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struct dm_pci_emul_ops sandbox_swap_case_emul_ops = {
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.get_devfn = sandbox_swap_case_get_devfn,
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.read_config = sandbox_swap_case_read_config,
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.write_config = sandbox_swap_case_write_config,
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.read_io = sandbox_swap_case_read_io,
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.write_io = sandbox_swap_case_write_io,
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.map_physmem = sandbox_swap_case_map_physmem,
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.unmap_physmem = sandbox_swap_case_unmap_physmem,
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};
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static const struct udevice_id sandbox_swap_case_ids[] = {
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{ .compatible = "sandbox,swap-case" },
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{ }
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};
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U_BOOT_DRIVER(sandbox_swap_case_emul) = {
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.name = "sandbox_swap_case_emul",
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.id = UCLASS_PCI_EMUL,
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.of_match = sandbox_swap_case_ids,
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.ops = &sandbox_swap_case_emul_ops,
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.priv_auto_alloc_size = sizeof(struct swap_case_priv),
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.platdata_auto_alloc_size = sizeof(struct swap_case_platdata),
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};
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