michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: pcie: Add support for IRQ allocation management

Browse source 
There are x86 platforms where the IRQ configuration register for PCIe
is not pre-populated and the OS needs to assign a number dynamically
by writing to the register.

In order to allocate interrupts we have to know which ones have been
hard-coded in device tree. We accomplish this by collecting these
values through the IRQ_CONNECT() macro and placing them in a dedicated
linker section (in ROM).

The full set of allocated interrupts are managed through a bitmap, and
the pre-allocated values (from the linker section) are inserted into
this upon initial runtime access.

This patch introduces a new pcie_alloc_irq() API that drivers can use
to allocate interrupt line numbers. The two in-tree drivers that were
using this API (I2C and UART) are converted to use the new API.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Johan Hedberg 2020-11-10 16:26:05 +02:00 • committed by Johan Hedberg
commit 9e4dfd8f4e
4 changed files with 107 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

9
include/arch/x86/intel64/arch.h
View file

@ -93,11 +93,20 @@ struct x86_ssf {
#endif /* _ASMLANGUAGE */
#ifdef CONFIG_PCIE
#define X86_RESERVE_IRQ(irq_p, name) \
static Z_DECL_ALIGN(uint8_t) name \
__in_section(_irq_alloc, static, name) __used = irq_p
#else
#define X86_RESERVE_IRQ(irq_p, name)
#endif
/*
* All Intel64 interrupts are dynamically connected.
*/
#define ARCH_IRQ_CONNECT(irq_p, priority_p, isr_p, isr_param_p, flags_p) \
X86_RESERVE_IRQ(irq_p, _CONCAT(_irq_alloc_fixed, __COUNTER__)); \
arch_irq_connect_dynamic(irq_p, priority_p, \
(void (*)(const void *))isr_p, \
isr_param_p, flags_p)