Add Cache Coherency Unit (CCU) driver. CCU is to ensures consistency of shared data between multi masters in the system.
Driver initializes CCU's directories and coherency agent interfaces in CCU IP.
Signed-off-by: Ley Foon Tan ley.foon.tan@intel.com Reviewed-by: Simon Goldschmidt simon.k.r.goldschmidt@gmail.com
--- v5: - Move CCU driver to DM. --- drivers/cache/Kconfig | 8 ++ drivers/cache/Makefile | 1 + drivers/cache/cache-ncore.c | 164 ++++++++++++++++++++++++++++++++++++ 3 files changed, 173 insertions(+) create mode 100644 drivers/cache/cache-ncore.c
diff --git a/drivers/cache/Kconfig b/drivers/cache/Kconfig index 629039e7a8..1e452ad6d9 100644 --- a/drivers/cache/Kconfig +++ b/drivers/cache/Kconfig @@ -31,4 +31,12 @@ config V5L2_CACHE It will configure tag and data ram timing control from the device tree and enable L2 cache.
+config NCORE_CACHE + bool "Arteris Ncore cache coherent unit driver" + select CACHE + help + This driver is for the Arteris Ncore cache coherent unit (CCU) + controller. The driver initializes cache directories and coherent + agent interfaces. + endmenu diff --git a/drivers/cache/Makefile b/drivers/cache/Makefile index c1f766cfca..6be895a5f7 100644 --- a/drivers/cache/Makefile +++ b/drivers/cache/Makefile @@ -2,4 +2,5 @@ obj-$(CONFIG_$(SPL_)CACHE) += cache-uclass.o obj-$(CONFIG_SANDBOX) += sandbox_cache.o obj-$(CONFIG_L2X0_CACHE) += cache-l2x0.o +obj-$(CONFIG_NCORE_CACHE) += cache-ncore.o obj-$(CONFIG_V5L2_CACHE) += cache-v5l2.o diff --git a/drivers/cache/cache-ncore.c b/drivers/cache/cache-ncore.c new file mode 100644 index 0000000000..e3aca36071 --- /dev/null +++ b/drivers/cache/cache-ncore.c @@ -0,0 +1,164 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Intel Corporation <www.intel.com> + * + */ +#include <dm.h> +#include <wait_bit.h> + +#include <asm/io.h> + +/* Directory */ +#define DIRUSFER 0x80010 +#define DIRUCASER0 0x80040 +#define DIRUSFMCR 0x80080 +#define DIRUSFMAR 0x80084 + +#define DIRUSFMCR_SFID_SHIFT 16 + +/* Coherent cache agent interface */ +#define CAIUIDR 0x00ffc + +#define CAIUIDR_CA_GET(v) (((v) & 0x00008000) >> 15) +#define CAIUIDR_TYPE_GET(v) (((v) & 0x000f0000) >> 16) +#define CAIUIDR_TYPE_ACE_CAI_DVM_SUPPORT 0 +#define CAIUIDR_TYPE_ACELITE_CAI_DVM_SUPPORT 1 + +/* Coherent subsystem */ +#define CSADSER0 0xff040 +#define CSUIDR 0xffff8 +#define CSIDR 0xffffc + +#define CSUIDR_NUMCAIUS_GET(v) (((v) & 0x0000007f) >> 0) +#define CSUIDR_NUMDIRUS_GET(v) (((v) & 0x003f0000) >> 16) +#define CSUIDR_NUMCMIUS_GET(v) (((v) & 0x3f000000) >> 24) + +#define CSIDR_NUMSFS_GET(v) (((v) & 0x007c0000) >> 18) + +#define DIR_REG_SZ 0x1000 +#define CAIU_REG_SZ 0x1000 + +#define CCU_DIR_REG_ADDR(base, reg, dir) \ + ((base) + (reg) + ((dir) * DIR_REG_SZ)) + +/* OCRAM firewall register */ +#define OCRAM_FW_01 0x100204 +#define OCRAM_SECURE_REGIONS 4 + +#define OCRAM_PRIVILEGED_MASK BIT(29) +#define OCRAM_SECURE_MASK BIT(30) + +static void ncore_ccu_init_dirs(void __iomem *base) +{ + ulong i, f; + int ret; + u32 num_of_dirs; + u32 num_of_snoop_filters; + u32 reg; + + num_of_dirs = CSUIDR_NUMDIRUS_GET(readl(base + CSUIDR)); + num_of_snoop_filters = + CSIDR_NUMSFS_GET(readl(base + CSIDR)) + 1; + + /* Initialize each snoop filter in each directory */ + for (f = 0; f < num_of_snoop_filters; f++) { + reg = f << DIRUSFMCR_SFID_SHIFT; + for (i = 0; i < num_of_dirs; i++) { + /* Initialize all entries */ + writel(reg, CCU_DIR_REG_ADDR(base, DIRUSFMCR, i)); + + /* Poll snoop filter maintenance operation active + * bit become 0. + */ + ret = wait_for_bit_le32((const void *) + CCU_DIR_REG_ADDR(base, + DIRUSFMAR, i), + BIT(0), false, 1000, false); + if (ret) { + puts("CCU: Directory initialization failed!\n"); + hang(); + } + + /* Enable snoop filter, a bit per snoop filter */ + setbits_le32((ulong)CCU_DIR_REG_ADDR(base, DIRUSFER, i), + BIT(f)); + } + } +} + +static void ncore_ccu_init_coh_agent(void __iomem *base) +{ + u32 num_of_coh_agent_intf; + u32 num_of_dirs; + u32 reg; + u32 type; + u32 i, dir; + + num_of_coh_agent_intf = + CSUIDR_NUMCAIUS_GET(readl(base + CSUIDR)); + num_of_dirs = CSUIDR_NUMDIRUS_GET(readl(base + CSUIDR)); + + for (i = 0; i < num_of_coh_agent_intf; i++) { + reg = readl(base + CAIUIDR + (i * CAIU_REG_SZ)); + if (CAIUIDR_CA_GET(reg)) { + /* Caching agent bit is enabled, enable caching agent + * snoop in each directory + */ + for (dir = 0; dir < num_of_dirs; dir++) { + setbits_le32((ulong) + CCU_DIR_REG_ADDR(base, DIRUCASER0, + dir), + BIT(i)); + } + } + + type = CAIUIDR_TYPE_GET(reg); + if (type == CAIUIDR_TYPE_ACE_CAI_DVM_SUPPORT || + type == CAIUIDR_TYPE_ACELITE_CAI_DVM_SUPPORT) { + /* DVM support is enabled, enable ACE DVM snoop*/ + setbits_le32((ulong)(base + CSADSER0), + BIT(i)); + } + } +} + +static void ocram_bypass_firewall(void __iomem *base) +{ + int i; + + for (i = 0; i < OCRAM_SECURE_REGIONS; i++) { + clrbits_le32(base + OCRAM_FW_01 + (i * sizeof(u32)), + OCRAM_PRIVILEGED_MASK | OCRAM_SECURE_MASK); + } +} + +static int ncore_ccu_probe(struct udevice *dev) +{ + void __iomem *base; + fdt_addr_t addr; + + addr = dev_read_addr(dev); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + base = (void __iomem *)addr; + + ncore_ccu_init_dirs(base); + ncore_ccu_init_coh_agent(base); + ocram_bypass_firewall(base); + + return 0; +} + +static const struct udevice_id ncore_ccu_ids[] = { + { .compatible = "arteris,ncore-ccu" }, + {} +}; + +U_BOOT_DRIVER(ncore_ccu) = { + .name = "ncore_ccu", + .id = UCLASS_CACHE, + .of_match = ncore_ccu_ids, + .probe = ncore_ccu_probe, + .flags = DM_FLAG_PRE_RELOC, +};