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mcb: Added bar descriptor support for non PCI bus MCB carrier 

Added support for the bar descriptor. This type is used for FPGAs
connect to the LPC or to a non PCI bus.

The Bar descriptor could have a maximum of 6 BARs. Each of the
devices within the FPGA could be mapped to a different BAR.
The BAR descriptor is comparable to the PCI header.

Signed-off-by: Andreas Werner <andreas.werner@men.de>
[ free bar descriptor in the non-error case ]
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Andreas Werner 2016-08-26 09:34:58 +02:00 committed by Greg Kroah-Hartman
parent 73edc8f7cc
commit ffc7bb3857
2 changed files with 121 additions and 14 deletions
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9
drivers/mcb/mcb-internal.h
View File

@ -112,6 +112,15 @@ struct chameleon_bdd {
u32 size;
} __packed;
struct chameleon_bar {
u32 addr;
u32 size;
};
#define BAR_CNT(x) ((x) & 0x07)
#define CHAMELEON_BAR_MAX 6
#define BAR_DESC_SIZE(x) ((x) * sizeof(struct chameleon_bar) + sizeof(__le32))
int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
void __iomem *base);

126
drivers/mcb/mcb-parse.c
View File

@ -26,19 +26,20 @@ static inline uint32_t get_next_dtype(void __iomem *p)
}
static int chameleon_parse_bdd(struct mcb_bus *bus,
phys_addr_t mapbase,
struct chameleon_bar *cb,
void __iomem *base)
{
return 0;
}
static int chameleon_parse_gdd(struct mcb_bus *bus,
phys_addr_t mapbase,
void __iomem *base)
struct chameleon_bar *cb,
void __iomem *base, int bar_count)
{
struct chameleon_gdd __iomem *gdd =
(struct chameleon_gdd __iomem *) base;
struct mcb_device *mdev;
u32 dev_mapbase;
u32 offset;
u32 size;
int ret;
@ -61,13 +62,39 @@ static int chameleon_parse_gdd(struct mcb_bus *bus,
mdev->group = GDD_GRP(reg2);
mdev->inst = GDD_INS(reg2);
/*
* If the BAR is missing, dev_mapbase is zero, or if the
* device is IO mapped we just print a warning and go on with the
* next device, instead of completely stop the gdd parser
*/
if (mdev->bar > bar_count - 1) {
pr_info("No BAR for 16z%03d\n", mdev->id);
ret = 0;
goto err;
}
dev_mapbase = cb[mdev->bar].addr;
if (!dev_mapbase) {
pr_info("BAR not assigned for 16z%03d\n", mdev->id);
ret = 0;
goto err;
}
if (dev_mapbase & 0x01) {
pr_info("IO mapped Device (16z%03d) not yet supported\n",
mdev->id);
ret = 0;
goto err;
}
pr_debug("Found a 16z%03d\n", mdev->id);
mdev->irq.start = GDD_IRQ(reg1);
mdev->irq.end = GDD_IRQ(reg1);
mdev->irq.flags = IORESOURCE_IRQ;
mdev->mem.start = mapbase + offset;
mdev->mem.start = dev_mapbase + offset;
mdev->mem.end = mdev->mem.start + size - 1;
mdev->mem.flags = IORESOURCE_MEM;
@ -85,13 +112,76 @@ err:
return ret;
}
static void chameleon_parse_bar(void __iomem *base,
struct chameleon_bar *cb, int bar_count)
{
char __iomem *p = base;
int i;
/* skip reg1 */
p += sizeof(__le32);
for (i = 0; i < bar_count; i++) {
cb[i].addr = readl(p);
cb[i].size = readl(p + 4);
p += sizeof(struct chameleon_bar);
}
}
static int chameleon_get_bar(char __iomem **base, phys_addr_t mapbase,
struct chameleon_bar **cb)
{
struct chameleon_bar *c;
int bar_count;
__le32 reg;
u32 dtype;
/*
* For those devices which are not connected
* to the PCI Bus (e.g. LPC) there is a bar
* descriptor located directly after the
* chameleon header. This header is comparable
* to a PCI header.
*/
dtype = get_next_dtype(*base);
if (dtype == CHAMELEON_DTYPE_BAR) {
reg = readl(*base);
bar_count = BAR_CNT(reg);
if (bar_count <= 0 && bar_count > CHAMELEON_BAR_MAX)
return -ENODEV;
c = kcalloc(bar_count, sizeof(struct chameleon_bar),
GFP_KERNEL);
if (!c)
return -ENOMEM;
chameleon_parse_bar(*base, c, bar_count);
*base += BAR_DESC_SIZE(bar_count);
} else {
c = kzalloc(sizeof(struct chameleon_bar), GFP_KERNEL);
if (!c)
return -ENOMEM;
bar_count = 1;
c->addr = mapbase;
}
*cb = c;
return bar_count;
}
int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
void __iomem *base)
{
char __iomem *p = base;
struct chameleon_fpga_header *header;
uint32_t dtype;
struct chameleon_bar *cb;
char __iomem *p = base;
int num_cells = 0;
uint32_t dtype;
int bar_count;
int ret = 0;
u32 hsize;
@ -108,8 +198,8 @@ int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
if (header->magic != CHAMELEONV2_MAGIC) {
pr_err("Unsupported chameleon version 0x%x\n",
header->magic);
kfree(header);
return -ENODEV;
ret = -ENODEV;
goto free_header;
}
p += hsize;
@ -119,16 +209,20 @@ int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
snprintf(bus->name, CHAMELEON_FILENAME_LEN + 1, "%s",
header->filename);
bar_count = chameleon_get_bar(&p, mapbase, &cb);
if (bar_count < 0)
goto free_header;
for_each_chameleon_cell(dtype, p) {
switch (dtype) {
case CHAMELEON_DTYPE_GENERAL:
ret = chameleon_parse_gdd(bus, mapbase, p);
ret = chameleon_parse_gdd(bus, cb, p, bar_count);
if (ret < 0)
goto out;
goto free_bar;
p += sizeof(struct chameleon_gdd);
break;
case CHAMELEON_DTYPE_BRIDGE:
chameleon_parse_bdd(bus, mapbase, p);
chameleon_parse_bdd(bus, cb, p);
p += sizeof(struct chameleon_bdd);
break;
case CHAMELEON_DTYPE_END:
@ -136,8 +230,8 @@ int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
default:
pr_err("Invalid chameleon descriptor type 0x%x\n",
dtype);
kfree(header);
return -EINVAL;
ret = -EINVAL;
goto free_bar;
}
num_cells++;
}
@ -145,11 +239,15 @@ int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
if (num_cells == 0)
num_cells = -EINVAL;
kfree(cb);
kfree(header);
return num_cells;
out:
free_bar:
kfree(cb);
free_header:
kfree(header);
return ret;
}
EXPORT_SYMBOL_GPL(chameleon_parse_cells);