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[POWERPC] cuboot-pq2: PCI fixes

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1. Detect (and bail out on) more conditions that violate the
assumptions of the setup code -- we assume in such cases that the device
tree is correct and reflects what the firmware did.

2. The inbound memory mask calculation was wrong.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Scott Wood 2008-04-15 11:02:31 -05:00 committed by Kumar Gala
parent 3866409541
commit 378458d865
1 changed files with 19 additions and 8 deletions
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27
arch/powerpc/boot/cuboot-pq2.c
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@ -128,7 +128,7 @@ static void fixup_pci(void)
u8 *soc_regs;
int i, len;
void *node, *parent_node;
u32 naddr, nsize, mem_log2;
u32 naddr, nsize, mem_pow2, mem_mask;
node = finddevice("/pci");
if (!node || !dt_is_compatible(node, "fsl,pq2-pci"))
@ -141,7 +141,7 @@ static void fixup_pci(void)
soc_regs = (u8 *)fsl_get_immr();
if (!soc_regs)
goto err;
goto unhandled;
dt_get_reg_format(node, &naddr, &nsize);
if (naddr != 3 || nsize != 2)
@ -153,7 +153,7 @@ static void fixup_pci(void)
dt_get_reg_format(parent_node, &naddr, &nsize);
if (naddr != 1 || nsize != 1)
goto err;
goto unhandled;
len = getprop(node, "ranges", pci_ranges_buf,
sizeof(pci_ranges_buf));
@ -170,14 +170,20 @@ static void fixup_pci(void)
}
if (!mem || !mmio || !io)
goto err;
goto unhandled;
if (mem->size[1] != mmio->size[1])
goto unhandled;
if (mem->size[1] & (mem->size[1] - 1))
goto unhandled;
if (io->size[1] & (io->size[1] - 1))
goto unhandled;
if (mem->phys_addr + mem->size[1] == mmio->phys_addr)
mem_base = mem;
else if (mmio->phys_addr + mmio->size[1] == mem->phys_addr)
mem_base = mmio;
else
goto err;
goto unhandled;
out_be32(&pci_regs[1][0], mem_base->phys_addr | 1);
out_be32(&pci_regs[2][0], ~(mem->size[1] + mmio->size[1] - 1));
@ -201,8 +207,9 @@ static void fixup_pci(void)
out_le32(&pci_regs[0][58], 0);
out_le32(&pci_regs[0][60], 0);
mem_log2 = 1 << (__ilog2_u32(bd.bi_memsize - 1) + 1);
out_le32(&pci_regs[0][62], 0xa0000000 | ~((1 << (mem_log2 - 12)) - 1));
mem_pow2 = 1 << (__ilog2_u32(bd.bi_memsize - 1) + 1);
mem_mask = ~(mem_pow2 - 1) >> 12;
out_le32(&pci_regs[0][62], 0xa0000000 | mem_mask);
/* If PCI is disabled, drive RST high to enable. */
if (!(in_le32(&pci_regs[0][32]) & 1)) {
@ -228,7 +235,11 @@ static void fixup_pci(void)
return;
err:
printf("Bad PCI node\r\n");
printf("Bad PCI node -- using existing firmware setup.\r\n");
return;
unhandled:
printf("Unsupported PCI node -- using existing firmware setup.\r\n");
}
static void pq2_platform_fixups(void)