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modified PCI access routines to closer follow pcibios standard

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This commit is contained in:
Markus Fröschle
2013-11-07 11:31:10 +00:00
parent 3b5afee7ff
commit f5ddbabee5
3 changed files with 68 additions and 79 deletions
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97
BaS_gcc/sources/pci.c
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@@ -66,14 +66,14 @@ static int num_pci_classes = sizeof(pci_classes) / sizeof(struct pci_class);
#define NUM_CARDS 10
#define NUM_RESOURCES 6
/* holds the handle of a card at position = array index */
static uint16_t handles[NUM_CARDS];
static int32_t handles[NUM_CARDS];
/* holds the card's resource descriptors; filled in pci_device_config() */
static struct pci_rd resource_descriptors[NUM_CARDS][NUM_RESOURCES];
/*
* retrieve handle for i'th device
*/
static int16_t handle2index(int16_t handle)
static int handle2index(int32_t handle)
{
int i;
@@ -104,24 +104,18 @@ static char *device_class(int classcode)
return "not found";
}
uint32_t pci_read_config_longword(uint16_t handle, uint16_t offset)
/*
* read an uint32_t from configuration space of card with handle and offset
*
* The returned value is in little endian format.
*/
uint32_t pci_read_config_longword(int32_t handle, int offset)
{
uint32_t value;
uint16_t bus = PCI_BUS_FROM_HANDLE(handle);
uint16_t device = PCI_DEVICE_FROM_HANDLE(handle);
uint16_t function = PCI_FUNCTION_FROM_HANDLE(handle);
#ifdef _NOT_USED_
/* clear PCI status/command register */
MCF_PCI_PCISCR = MCF_PCI_PCISCR_PE | /* clear parity error bit */
MCF_PCI_PCISCR_SE | /* clear system error */
MCF_PCI_PCISCR_MA | /* clear master abort */
MCF_PCI_PCISCR_TR | /* clear target abort */
MCF_PCI_PCISCR_TS | /* clear target abort signalling (as target) */
MCF_PCI_PCISCR_DP; /* clear parity error */
#endif /* _NOT_USED_ */
/* initiate PCI configuration access to device */
MCF_PCI_PCICAR = MCF_PCI_PCICAR_E | /* enable configuration access special cycle */
MCF_PCI_PCICAR_BUSNUM(bus) |
@@ -131,10 +125,10 @@ uint32_t pci_read_config_longword(uint16_t handle, uint16_t offset)
value = * (volatile uint32_t *) PCI_IO_OFFSET; /* access device */
return swpl(value);
return value;
}
uint16_t pci_read_config_word(uint16_t handle, uint16_t offset)
uint16_t pci_read_config_word(int32_t handle, int offset)
{
uint32_t value;
@@ -142,35 +136,25 @@ uint16_t pci_read_config_word(uint16_t handle, uint16_t offset)
return value >> ((1 - offset % 2) * 16) & 0xffff;
}
uint8_t pci_read_config_byte(uint16_t handle, uint16_t offset)
uint8_t pci_read_config_byte(int32_t handle, int offset)
{
uint32_t value;
value = pci_read_config_longword(handle, offset);
//xprintf("pci_read_config_longword(0x%x, 0x%x) = 0x%04x\r\n", handle, offset, value);
return value >> ((3 - offset % 4) * 8) & 0xff;
}
/*
* pci_write_config_longword()
*
* write an uint32_t value to the configuration space of a PCI device
* offset is a PCI DWORD value.
* write an uint32_t value (must be in little endian format) to the configuration space of a PCI device
*/
void pci_write_config_longword(uint16_t handle, uint16_t offset, uint32_t value)
int32_t pci_write_config_longword(int32_t handle, int offset, uint32_t value)
{
uint16_t bus = PCI_BUS_FROM_HANDLE(handle);
uint16_t device = PCI_DEVICE_FROM_HANDLE(handle);
uint16_t function = PCI_FUNCTION_FROM_HANDLE(handle);
/* clear PCI status/command register */
MCF_PCI_PCISCR = MCF_PCI_PCISCR_PE | /* clear parity error bit */
MCF_PCI_PCISCR_SE | /* clear system error */
MCF_PCI_PCISCR_MA | /* clear master abort */
MCF_PCI_PCISCR_TR | /* clear target abort */
MCF_PCI_PCISCR_TS | /* clear target abort signalling (as target) */
MCF_PCI_PCISCR_DP; /* clear parity error */
/* initiate PCI configuration access to device */
MCF_PCI_PCICAR = MCF_PCI_PCICAR_E | /* enable configuration access special cycle */
MCF_PCI_PCICAR_BUSNUM(bus) |
@@ -178,7 +162,9 @@ void pci_write_config_longword(uint16_t handle, uint16_t offset, uint32_t value)
MCF_PCI_PCICAR_FUNCNUM(function) | /* function number */
MCF_PCI_PCICAR_DWORD(offset / 4);
* (volatile uint32_t *) PCI_IO_OFFSET = swpl(value); /* access device */
* (volatile uint32_t *) PCI_IO_OFFSET = value; /* access device */
return PCI_SUCCESSFUL;
}
/*
@@ -186,7 +172,7 @@ void pci_write_config_longword(uint16_t handle, uint16_t offset, uint32_t value)
*
* get resource descriptor chain for handle
*/
struct pci_rd *pci_get_resource(uint16_t handle)
struct pci_rd *pci_get_resource(int32_t handle)
{
int index = -1;
@@ -202,13 +188,13 @@ struct pci_rd *pci_get_resource(uint16_t handle)
* find index'th device by device_id and vendor_id. Special case: vendor id -1 (0xffff)
* matches all devices. You can search the whole bus by repeatedly calling this function
*/
int16_t pci_find_device(uint16_t device_id, uint16_t vendor_id, int index)
int32_t pci_find_device(uint16_t device_id, uint16_t vendor_id, int index)
{
uint16_t bus;
uint16_t device;
uint16_t function = 0;
uint16_t pos = 0;
int handle;
uint16_t n = 0;
int32_t handle;
for (bus = 0; bus < 255; bus++)
{
@@ -218,61 +204,62 @@ int16_t pci_find_device(uint16_t device_id, uint16_t vendor_id, int index)
uint8_t htr;
handle = PCI_HANDLE(bus, device, 0);
value = pci_read_config_longword(handle, PCIIDR);
value = swpl(pci_read_config_longword(handle, PCIIDR));
if (value != 0xffffffff) /* we have a device at this position */
{
if (vendor_id == 0xffff ||
(PCI_VENDOR_ID(value) == vendor_id && PCI_DEVICE_ID(value) == device_id))
{
if (pos == index)
if (n == index)
{
return handle;
}
}
if (pci_read_config_byte(handle, PCIHTR) & 0x80)
/*
* There is a device at this position, but not the one we are looking for.
* Check to see if it is a multi-function device. We need to look "behind" it
* for the other functions in that case.
*/
if ((htr = pci_read_config_byte(handle, PCIHTR)) & 0x80)
{
/* check if we have a multi-function device at this position */
htr = pci_read_config_byte(handle, PCIHTR);
/* yes, this is a multi-function device, look for more functions */
xprintf("bus = %02x, dev = %02x, func = %02x PCIHTR=%02x\r\n", bus, device, function, htr);
for (function = 1; function < 8; function++)
{
pos++;
handle = PCI_HANDLE(bus, device, function);
value = pci_read_config_longword(handle, PCIIDR);
value = swpl(pci_read_config_longword(handle, PCIIDR));
if (value != 0xFFFFFFFF) /* device found */
{
n++;
if (vendor_id == 0xffff ||
(PCI_VENDOR_ID(value) == vendor_id && PCI_DEVICE_ID(value) == device_id))
{
if (pos == index)
if (n == index)
{
return handle;
}
else
{
//pos++;
}
}
}
}
}
/* we found a match, but at wrong position */
pos++;
else /* no, current device is not multi-function */
n++; /* next one */
}
}
}
return PCI_DEVICE_NOT_FOUND;
}
int16_t pci_hook_interrupt(uint16_t handle, void *handler, void *parameter)
int32_t pci_hook_interrupt(int32_t handle, void *handler, void *parameter)
{
/* FIXME: implement */
xprintf("pci_hook_interrupt() still not implemented\r\n");
return PCI_SUCCESSFUL;
}
int16_t pci_unhook_interrupt(uint16_t handle)
int32_t pci_unhook_interrupt(int32_t handle)
{
/* FIXME: implement */
@@ -319,7 +306,7 @@ static void pci_device_config(uint16_t bus, uint16_t device, uint16_t function)
/*
* read BAR[i] value
*/
value = pci_read_config_longword(handle, PCIBAR0 + i);
value = swpl(pci_read_config_longword(handle, PCIBAR0 + i));
/*
* write all bits of BAR[i]
@@ -329,7 +316,7 @@ static void pci_device_config(uint16_t bus, uint16_t device, uint16_t function)
/*
* read back value to see which bits have been set
*/
address = pci_read_config_longword(handle, PCIBAR0 + i);
address = swpl(pci_read_config_longword(handle, PCIBAR0 + i));
if (address) /* is bar in use? */
{
@@ -350,7 +337,7 @@ static void pci_device_config(uint16_t bus, uint16_t device, uint16_t function)
pci_write_config_longword(handle, PCIBAR0 + i, mem_address);
/* read it back, just to be sure */
value = pci_read_config_longword(handle, PCIBAR0 + i);
value = swpl(pci_read_config_longword(handle, PCIBAR0 + i));
/* fill resource descriptor */
rd->next = sizeof(struct pci_rd);
@@ -372,7 +359,7 @@ static void pci_device_config(uint16_t bus, uint16_t device, uint16_t function)
io_address = (io_address + size - 1) & ~(size - 1);
pci_write_config_longword(handle, PCIBAR0 + i, io_address);
value = pci_read_config_longword(handle, PCIBAR0 + i);
value = swpl(pci_read_config_longword(handle, PCIBAR0 + i));
rd->next = sizeof(struct pci_rd);
rd->flags = FLG_IO | FLG_8BIT | FLG_16BIT | FLG_32BIT | 1;
@@ -409,7 +396,7 @@ void pci_scan(void)
{
uint32_t value;
value = pci_read_config_longword(handle, PCIIDR);
value = swpl(pci_read_config_longword(handle, PCIIDR));
xprintf(" %02x | %02x | %02x |%04x|%04x| %s (0x%02x)\r\n",
PCI_BUS_FROM_HANDLE(handle),
PCI_DEVICE_FROM_HANDLE(handle),