From mboxrd@z Thu Jan 1 00:00:00 1970 From: thomas.petazzoni@free-electrons.com (Thomas Petazzoni) Date: Tue, 12 Feb 2013 17:28:55 +0100 Subject: [PATCH 21/32] arm: mvebu: add functions to alloc/free PCIe decoding windows In-Reply-To: <1360686546-24277-1-git-send-email-thomas.petazzoni@free-electrons.com> References: <1360686546-24277-1-git-send-email-thomas.petazzoni@free-electrons.com> Message-ID: <1360686546-24277-22-git-send-email-thomas.petazzoni@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This commit adds two functions armada_370_xp_alloc_pcie_window() and armada_370_xp_free_pcie_window() that respectively allocate and free an address decoding window pointing to either a memory or I/O region of a PCIe device. Those functions will be used by the PCIe driver to create and remove those regions depending on the PCIe devices that are detected. Signed-off-by: Thomas Petazzoni --- arch/arm/mach-mvebu/addr-map.c | 87 +++++++++++++++++++++++++-- arch/arm/mach-mvebu/common.h | 1 + arch/arm/mach-mvebu/include/mach/addr-map.h | 10 +++ 3 files changed, 94 insertions(+), 4 deletions(-) create mode 100644 arch/arm/mach-mvebu/include/mach/addr-map.h diff --git a/arch/arm/mach-mvebu/addr-map.c b/arch/arm/mach-mvebu/addr-map.c index 77c807b..6f9dda7 100644 --- a/arch/arm/mach-mvebu/addr-map.c +++ b/arch/arm/mach-mvebu/addr-map.c @@ -24,14 +24,10 @@ #define ARMADA_XP_TARGET_DEV_BUS 1 #define ARMADA_XP_ATTR_DEV_BOOTROM 0x1D #define ARMADA_XP_TARGET_ETH1 3 -#define ARMADA_XP_TARGET_PCIE_0_2 4 #define ARMADA_XP_TARGET_ETH0 7 -#define ARMADA_XP_TARGET_PCIE_1_3 8 #define ARMADA_370_TARGET_DEV_BUS 1 #define ARMADA_370_ATTR_DEV_BOOTROM 0x1D -#define ARMADA_370_TARGET_PCIE_0 4 -#define ARMADA_370_TARGET_PCIE_1 8 #define ARMADA_WINDOW_8_PLUS_OFFSET 0x90 #define ARMADA_SDRAM_ADDR_DECODING_OFFSET 0x180 @@ -89,6 +85,89 @@ static struct __initdata orion_addr_map_cfg addr_map_cfg = { .win_cfg_base = armada_cfg_base, }; +#ifdef CONFIG_PCI +/* + * This structure and the following arrays allow to map a PCIe (port, + * lane) tuple to the corresponding (target, attribute) tuple needed + * to configure an address decoding window for the given PCIe (port, + * lane). + */ +struct pcie_mapping { + int port; + int lane; + u8 target; + u8 attr; +}; + +struct pcie_mapping armada_xp_pcie_mappings[] = { + { .port = 0, .lane = 0, .target = 4, .attr = 0xE0 }, + { .port = 0, .lane = 1, .target = 4, .attr = 0xD0 }, + { .port = 0, .lane = 2, .target = 4, .attr = 0xB0 }, + { .port = 0, .lane = 3, .target = 4, .attr = 0x70 }, + { .port = 1, .lane = 0, .target = 8, .attr = 0xE0 }, + { .port = 1, .lane = 1, .target = 8, .attr = 0xD0 }, + { .port = 1, .lane = 2, .target = 8, .attr = 0xB0 }, + { .port = 1, .lane = 3, .target = 8, .attr = 0x70 }, + { .port = 2, .lane = 0, .target = 4, .attr = 0xF0 }, + { .port = 3, .lane = 0, .target = 8, .attr = 0xF0 }, + { .port = -1 }, +}; + +struct pcie_mapping armada_370_pcie_mappings[] = { + { .port = 0, .lane = 0, .target = 4, .attr = 0xE0 }, + { .port = 1, .lane = 0, .target = 8, .attr = 0xE0 }, + { .port = -1 }, +}; + +/* + * This function sets up a new address decoding window at the given + * base address, pointing to the given PCIe interface (through + * pcie_port and pcie_lane). + */ +int armada_370_xp_alloc_pcie_window(int pcie_port, int pcie_lane, + u32 base, u32 remap, u32 size, + int type) +{ + struct pcie_mapping *mapping, *mappings; + u8 target, attr; + + if (of_machine_is_compatible("marvell,armadaxp")) + mappings = armada_xp_pcie_mappings; + else if (of_machine_is_compatible("marvell,armada370")) + mappings = armada_370_pcie_mappings; + else + return -ENODEV; + + for (mapping = mappings; mapping->port != -1; mapping++) + if (mapping->port == pcie_port && mapping->lane == pcie_lane) + break; + + if (mapping->port == -1) + return -ENODEV; + + target = mapping->target; + attr = mapping->attr; + + /* + * Bit 3 of the attributes indicates that it is a + * memory region, as opposed to an I/O region + */ + if (type == IORESOURCE_MEM) + attr |= (1 << 3); + + return orion_alloc_cpu_win(&addr_map_cfg, base, size, target, attr, remap); +} + +/* + * Frees an address decoding window previously set up by + * armada_370_xp_setup_pcie_window(). + */ +int armada_370_xp_free_pcie_window(u32 base) +{ + return orion_free_cpu_win(&addr_map_cfg, base); +} +#endif + static int __init armada_setup_cpu_mbus(void) { struct device_node *np; diff --git a/arch/arm/mach-mvebu/common.h b/arch/arm/mach-mvebu/common.h index aa27bc2..77c078c 100644 --- a/arch/arm/mach-mvebu/common.h +++ b/arch/arm/mach-mvebu/common.h @@ -25,4 +25,5 @@ int armada_370_xp_coherency_init(void); int armada_370_xp_pmsu_init(void); void armada_xp_secondary_startup(void); extern struct smp_operations armada_xp_smp_ops; + #endif diff --git a/arch/arm/mach-mvebu/include/mach/addr-map.h b/arch/arm/mach-mvebu/include/mach/addr-map.h new file mode 100644 index 0000000..e2d29cd --- /dev/null +++ b/arch/arm/mach-mvebu/include/mach/addr-map.h @@ -0,0 +1,10 @@ +#ifndef MVEBU_ADDR_MAP_H +#define MVEBU_ADDR_MAP_H + +#include + +int armada_370_xp_alloc_pcie_window(int pcie_port, int pcie_lane, + u32 base, u32 remap, u32 size, int type); +int armada_370_xp_free_pcie_window(unsigned long base); + +#endif /* MVEBU_ADDR_MAP_H */ -- 1.7.9.5