From: Rick Chen rick@andestech.com
Add a v5l2 cache controller driver that is usually found on Andes RISC-V ae350 platform. It will parse the cache settings from the dtb.
In this version tag and data ram control timing can be adjusted by the requirement from the dtb.
Signed-off-by: Rick Chen rick@andestech.com Cc: KC Lin kclin@andestech.com --- drivers/cache/Kconfig | 9 +++ drivers/cache/Makefile | 1 + drivers/cache/cache-v5l2.c | 186 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 196 insertions(+) create mode 100644 drivers/cache/cache-v5l2.c
diff --git a/drivers/cache/Kconfig b/drivers/cache/Kconfig index 24def7a..629039e 100644 --- a/drivers/cache/Kconfig +++ b/drivers/cache/Kconfig @@ -22,4 +22,13 @@ config L2X0_CACHE ARMv7(32-bit) devices. The driver configures the cache settings found in the device tree.
+config V5L2_CACHE + bool "Andes V5L2 cache driver" + select CACHE + depends on RISCV_NDS_CACHE + help + Support Andes V5L2 cache controller in AE350 platform. + It will configure tag and data ram timing control from the + device tree and enable L2 cache. + endmenu diff --git a/drivers/cache/Makefile b/drivers/cache/Makefile index 9deb961..4a6458c 100644 --- a/drivers/cache/Makefile +++ b/drivers/cache/Makefile @@ -2,3 +2,4 @@ obj-$(CONFIG_CACHE) += cache-uclass.o obj-$(CONFIG_SANDBOX) += sandbox_cache.o obj-$(CONFIG_L2X0_CACHE) += cache-l2x0.o +obj-$(CONFIG_V5L2_CACHE) += cache-v5l2.o diff --git a/drivers/cache/cache-v5l2.c b/drivers/cache/cache-v5l2.c new file mode 100644 index 0000000..d367171 --- /dev/null +++ b/drivers/cache/cache-v5l2.c @@ -0,0 +1,186 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Andes Technology Corporation + * Rick Chen, Andes Technology Corporation rick@andestech.com + */ + +#include <common.h> +#include <command.h> +#include <cache.h> +#include <dm.h> +#include <asm/io.h> +#include <dm/ofnode.h> + +struct l2cache { + volatile u64 configure; + volatile u64 control; + volatile u64 hpm0; + volatile u64 hpm1; + volatile u64 hpm2; + volatile u64 hpm3; + volatile u64 error_status; + volatile u64 ecc_error; + volatile u64 cctl_command0; + volatile u64 cctl_access_line0; + volatile u64 cctl_command1; + volatile u64 cctl_access_line1; + volatile u64 cctl_command2; + volatile u64 cctl_access_line2; + volatile u64 cctl_command3; + volatile u64 cctl_access_line4; + volatile u64 cctl_status; +}; + +/* Control Register */ +#define L2_ENABLE 0x1 +/* prefetch */ +#define IPREPETCH_OFF 3 +#define DPREPETCH_OFF 5 +#define IPREPETCH_MSK (3 << IPREPETCH_OFF) +#define DPREPETCH_MSK (3 << DPREPETCH_OFF) +/* tag ram */ +#define TRAMOCTL_OFF 8 +#define TRAMICTL_OFF 10 +#define TRAMOCTL_MSK (3 << TRAMOCTL_OFF) +#define TRAMICTL_MSK BIT(TRAMICTL_OFF) +/* data ram */ +#define DRAMOCTL_OFF 11 +#define DRAMICTL_OFF 13 +#define DRAMOCTL_MSK (3 << DRAMOCTL_OFF) +#define DRAMICTL_MSK BIT(DRAMICTL_OFF) + +/* CCTL Command Register */ +#define CCTL_CMD_REG(base, hart) ((ulong)(base) + 0x40 + (hart) * 0x10) +#define L2_WBINVAL_ALL 0x12 + +/* CCTL Status Register */ +#define CCTL_STATUS_MSK(hart) (0xf << ((hart) * 4)) +#define CCTL_STATUS_IDLE(hart) (0 << ((hart) * 4)) +#define CCTL_STATUS_PROCESS(hart) (1 << ((hart) * 4)) +#define CCTL_STATUS_ILLEGAL(hart) (2 << ((hart) * 4)) + +DECLARE_GLOBAL_DATA_PTR; + +struct v5l2_plat { + struct l2cache *regs; + u32 iprefetch; + u32 dprefetch; + u32 tram_ctl[2]; + u32 dram_ctl[2]; +}; + +static int v5l2_enable(struct udevice *dev) +{ + struct v5l2_plat *plat = dev_get_platdata(dev); + volatile struct l2cache *regs = plat->regs; + + if (regs) + setbits_le32(®s->control, L2_ENABLE); + + return 0; +} + +static int v5l2_disable(struct udevice *dev) +{ + struct v5l2_plat *plat = dev_get_platdata(dev); + volatile struct l2cache *regs = plat->regs; + u8 hart = gd->arch.boot_hart; + void __iomem *cctlcmd = (void __iomem *)CCTL_CMD_REG(regs, hart); + + if ((regs) && (readl(®s->control) & L2_ENABLE)) { + writel(L2_WBINVAL_ALL, cctlcmd); + + while ((readl(®s->cctl_status) & CCTL_STATUS_MSK(hart))) { + if ((readl(®s->cctl_status) & CCTL_STATUS_ILLEGAL(hart))) { + printf("L2 flush illegal! hanging..."); + hang(); + } + } + clrbits_le32(®s->control, L2_ENABLE); + } + + return 0; +} + +static int v5l2_ofdata_to_platdata(struct udevice *dev) +{ + struct v5l2_plat *plat = dev_get_platdata(dev); + struct l2cache *regs; + + regs = (struct l2cache *)dev_read_addr(dev); + plat->regs = regs; + + plat->iprefetch = -EINVAL; + plat->dprefetch = -EINVAL; + plat->tram_ctl[0] = -EINVAL; + plat->dram_ctl[0] = -EINVAL; + + /* Instruction and data fetch prefetch depth */ + dev_read_u32(dev, "andes,inst-prefetch", &plat->iprefetch); + dev_read_u32(dev, "andes,data-prefetch", &plat->dprefetch); + + /* Set tag RAM and data RAM setup and output cycle */ + dev_read_u32_array(dev, "andes,tag-ram-ctl", plat->tram_ctl, 2); + dev_read_u32_array(dev, "andes,data-ram-ctl", plat->dram_ctl, 2); + + return 0; +} + +static int v5l2_probe(struct udevice *dev) +{ + struct v5l2_plat *plat = dev_get_platdata(dev); + struct l2cache *regs = plat->regs; + u32 ctl_val; + + ctl_val = readl(®s->control); + + if (!(ctl_val & L2_ENABLE)) + ctl_val |= L2_ENABLE; + + if (plat->iprefetch != -EINVAL) { + ctl_val &= ~(IPREPETCH_MSK); + ctl_val |= (plat->iprefetch << IPREPETCH_OFF); + } + + if (plat->dprefetch != -EINVAL) { + ctl_val &= ~(DPREPETCH_MSK); + ctl_val |= (plat->dprefetch << DPREPETCH_OFF); + } + + if (plat->tram_ctl[0] != -EINVAL) { + ctl_val &= ~(TRAMOCTL_MSK | TRAMICTL_MSK); + ctl_val |= plat->tram_ctl[0] << TRAMOCTL_OFF; + ctl_val |= plat->tram_ctl[1] << TRAMICTL_OFF; + } + + if (plat->dram_ctl[0] != -EINVAL) { + ctl_val &= ~(DRAMOCTL_MSK | DRAMICTL_MSK); + ctl_val |= plat->dram_ctl[0] << DRAMOCTL_OFF; + ctl_val |= plat->dram_ctl[1] << DRAMICTL_OFF; + } + + writel(ctl_val, ®s->control); + + return 0; +} + +static const struct udevice_id v5l2_cache_ids[] = { + { .compatible = "v5l2cache" }, + {} +}; + +static const struct cache_ops v5l2_cache_ops = { + .enable = v5l2_enable, + .disable = v5l2_disable, +}; + +U_BOOT_DRIVER(v5l2_cache) = { + .name = "v5l2_cache", + .id = UCLASS_CACHE, + .of_match = v5l2_cache_ids, + .ofdata_to_platdata = v5l2_ofdata_to_platdata, + .probe = v5l2_probe, + .platdata_auto_alloc_size = sizeof(struct v5l2_plat), + .ops = &v5l2_cache_ops, + .flags = DM_FLAG_PRE_RELOC, +};