diff options
Diffstat (limited to 'arch/arm/cpu/armv7/keystone/aemif.c')
| -rw-r--r-- | arch/arm/cpu/armv7/keystone/aemif.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/keystone/aemif.c b/arch/arm/cpu/armv7/keystone/aemif.c new file mode 100644 index 0000000000..9b26886dba --- /dev/null +++ b/arch/arm/cpu/armv7/keystone/aemif.c @@ -0,0 +1,71 @@ +/* + * Keystone2: Asynchronous EMIF Configuration + * + * (C) Copyright 2012-2014 + * Texas Instruments Incorporated, <www.ti.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/arch/clock.h> +#include <asm/arch/emif_defs.h> + +#define AEMIF_CFG_SELECT_STROBE(v) ((v) ? 1 << 31 : 0) +#define AEMIF_CFG_EXTEND_WAIT(v) ((v) ? 1 << 30 : 0) +#define AEMIF_CFG_WR_SETUP(v) (((v) & 0x0f) << 26) +#define AEMIF_CFG_WR_STROBE(v) (((v) & 0x3f) << 20) +#define AEMIF_CFG_WR_HOLD(v) (((v) & 0x07) << 17) +#define AEMIF_CFG_RD_SETUP(v) (((v) & 0x0f) << 13) +#define AEMIF_CFG_RD_STROBE(v) (((v) & 0x3f) << 7) +#define AEMIF_CFG_RD_HOLD(v) (((v) & 0x07) << 4) +#define AEMIF_CFG_TURN_AROUND(v) (((v) & 0x03) << 2) +#define AEMIF_CFG_WIDTH(v) (((v) & 0x03) << 0) + +#define set_config_field(reg, field, val) \ + do { \ + if (val != -1) { \ + reg &= ~AEMIF_CFG_##field(0xffffffff); \ + reg |= AEMIF_CFG_##field(val); \ + } \ + } while (0) + +void configure_async_emif(int cs, struct async_emif_config *cfg) +{ + unsigned long tmp; + + if (cfg->mode == ASYNC_EMIF_MODE_NAND) { + tmp = __raw_readl(&davinci_emif_regs->nandfcr); + tmp |= (1 << cs); + __raw_writel(tmp, &davinci_emif_regs->nandfcr); + + } else if (cfg->mode == ASYNC_EMIF_MODE_ONENAND) { + tmp = __raw_readl(&davinci_emif_regs->one_nand_cr); + tmp |= (1 << cs); + __raw_writel(tmp, &davinci_emif_regs->one_nand_cr); + } + + tmp = __raw_readl(&davinci_emif_regs->abncr[cs]); + + set_config_field(tmp, SELECT_STROBE, cfg->select_strobe); + set_config_field(tmp, EXTEND_WAIT, cfg->extend_wait); + set_config_field(tmp, WR_SETUP, cfg->wr_setup); + set_config_field(tmp, WR_STROBE, cfg->wr_strobe); + set_config_field(tmp, WR_HOLD, cfg->wr_hold); + set_config_field(tmp, RD_SETUP, cfg->rd_setup); + set_config_field(tmp, RD_STROBE, cfg->rd_strobe); + set_config_field(tmp, RD_HOLD, cfg->rd_hold); + set_config_field(tmp, TURN_AROUND, cfg->turn_around); + set_config_field(tmp, WIDTH, cfg->width); + + __raw_writel(tmp, &davinci_emif_regs->abncr[cs]); +} + +void init_async_emif(int num_cs, struct async_emif_config *config) +{ + int cs; + + for (cs = 0; cs < num_cs; cs++) + configure_async_emif(cs, config + cs); +} |