diff options
Diffstat (limited to 'drivers/cache/cache-andes-l2.c')
| -rw-r--r-- | drivers/cache/cache-andes-l2.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/drivers/cache/cache-andes-l2.c b/drivers/cache/cache-andes-l2.c new file mode 100644 index 0000000..7de8f16 --- /dev/null +++ b/drivers/cache/cache-andes-l2.c @@ -0,0 +1,204 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Andes Technology Corporation + * Rick Chen, Andes Technology Corporation <rick@andestech.com> + */ + +#include <command.h> +#include <cache.h> +#include <dm.h> +#include <hang.h> +#include <asm/global_data.h> +#include <asm/io.h> +#include <dm/ofnode.h> +#include <linux/bitops.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; +}; + +/* Configuration register */ +#define MEM_MAP_OFF 20 +#define MEM_MAP_MSK BIT(MEM_MAP_OFF) +/* offset of v0 memory map (Gen1) */ +static u32 cmd_stride = 0x10; +static u32 status_stride = 0x0; +static u32 status_bit_offset = 0x4; + +/* 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) * (cmd_stride)) +#define L2_WBINVAL_ALL 0x12 + +/* CCTL Status Register */ +#define CCTL_STATUS_REG(base, hart) ((ulong)(base) + 0x80 + (hart) * (status_stride)) +#define CCTL_STATUS_MSK(hart) (0xf << ((hart) * (status_bit_offset))) +#define CCTL_STATUS_IDLE(hart) (0 << ((hart) * (status_bit_offset))) +#define CCTL_STATUS_PROCESS(hart) (1 << ((hart) * (status_bit_offset))) +#define CCTL_STATUS_ILLEGAL(hart) (2 << ((hart) * (status_bit_offset))) + +DECLARE_GLOBAL_DATA_PTR; + +struct andes_l2_plat { + struct l2cache *regs; + u32 iprefetch; + u32 dprefetch; + u32 tram_ctl[2]; + u32 dram_ctl[2]; +}; + +static int andes_l2_enable(struct udevice *dev) +{ + struct andes_l2_plat *plat = dev_get_plat(dev); + volatile struct l2cache *regs = plat->regs; + + if (regs) + setbits_le32(®s->control, L2_ENABLE); + + return 0; +} + +static int andes_l2_disable(struct udevice *dev) +{ + struct andes_l2_plat *plat = dev_get_plat(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 andes_l2_of_to_plat(struct udevice *dev) +{ + struct andes_l2_plat *plat = dev_get_plat(dev); + struct l2cache *regs; + + regs = dev_read_addr_ptr(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 andes_l2_probe(struct udevice *dev) +{ + struct andes_l2_plat *plat = dev_get_plat(dev); + struct l2cache *regs = plat->regs; + u32 cfg_val, ctl_val; + + cfg_val = readl(®s->configure); + ctl_val = readl(®s->control); + + /* If true, v1 memory map (Gen2) */ + if (cfg_val & MEM_MAP_MSK) { + cmd_stride = 0x1000; + status_stride = 0x1000; + status_bit_offset = 0x0; + } + + 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 andes_l2_cache_ids[] = { + { .compatible = "cache" }, + {} +}; + +static const struct cache_ops andes_l2_cache_ops = { + .enable = andes_l2_enable, + .disable = andes_l2_disable, +}; + +U_BOOT_DRIVER(andes_l2_cache) = { + .name = "andes_l2_cache", + .id = UCLASS_CACHE, + .of_match = andes_l2_cache_ids, + .of_to_plat = andes_l2_of_to_plat, + .probe = andes_l2_probe, + .plat_auto = sizeof(struct andes_l2_plat), + .ops = &andes_l2_cache_ops, + .flags = DM_FLAG_PRE_RELOC, +}; |