Add support for the Kona SDHCI found on Broadcom mobile SoCs.
Signed-off-by: Darwin Rambo drambo@broadcom.com Reviewed-by: Steve Rae srae@broadcom.com Reviewed-by: Tim Kryger tkryger@linaro.org --- drivers/mmc/Makefile | 1 + drivers/mmc/kona_sdhci.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 126 insertions(+) create mode 100644 drivers/mmc/kona_sdhci.c
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile index e793ed9..931922b 100644 --- a/drivers/mmc/Makefile +++ b/drivers/mmc/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_OMAP_HSMMC) += omap_hsmmc.o obj-$(CONFIG_PXA_MMC_GENERIC) += pxa_mmc_gen.o obj-$(CONFIG_SDHCI) += sdhci.o obj-$(CONFIG_BCM2835_SDHCI) += bcm2835_sdhci.o +obj-$(CONFIG_KONA_SDHCI) += kona_sdhci.o obj-$(CONFIG_S5P_SDHCI) += s5p_sdhci.o obj-$(CONFIG_SH_MMCIF) += sh_mmcif.o obj-$(CONFIG_SPEAR_SDHCI) += spear_sdhci.o diff --git a/drivers/mmc/kona_sdhci.c b/drivers/mmc/kona_sdhci.c new file mode 100644 index 0000000..69e6f17 --- /dev/null +++ b/drivers/mmc/kona_sdhci.c @@ -0,0 +1,125 @@ +/* + * Copyright 2013 Broadcom Corporation. All rights reserved. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <malloc.h> +#include <sdhci.h> +#include <asm/errno.h> +#include <asm/kona-common/clk.h> + +#define SDHCI_CORECTRL_OFFSET 0x00008000 +#define SDHCI_CORECTRL_EN 0x01 +#define SDHCI_CORECTRL_RESET 0x02 + +#define SDHCI_CORESTAT_OFFSET 0x00008004 +#define SDHCI_CORESTAT_CD_SW 0x01 + +#define SDHCI_COREIMR_OFFSET 0x00008008 +#define SDHCI_COREIMR_IP 0x01 + +static int init_mmc_core(struct sdhci_host *host) +{ + unsigned int mask; + unsigned int timeout; + + if (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & SDHCI_RESET_ALL) { + printf("%s: sd host controller reset error\n", __func__); + return 1; + } + + /* For kona a hardware reset before anything else. */ + mask = sdhci_readl(host, SDHCI_CORECTRL_OFFSET) | SDHCI_CORECTRL_RESET; + sdhci_writel(host, mask, SDHCI_CORECTRL_OFFSET); + + /* Wait max 100 ms */ + timeout = 1000; + do { + if (timeout == 0) { + printf("%s: reset timeout error\n", __func__); + return 1; + } + timeout--; + udelay(100); + } while (0 == + (sdhci_readl(host, SDHCI_CORECTRL_OFFSET) & + SDHCI_CORECTRL_RESET)); + + /* Clear the reset bit. */ + mask = mask & ~SDHCI_CORECTRL_RESET; + sdhci_writel(host, mask, SDHCI_CORECTRL_OFFSET); + udelay(10); + + /* Enable AHB clock */ + mask = sdhci_readl(host, SDHCI_CORECTRL_OFFSET); + sdhci_writel(host, mask | SDHCI_CORECTRL_EN, SDHCI_CORECTRL_OFFSET); + + /* Enable interrupts */ + sdhci_writel(host, SDHCI_COREIMR_IP, SDHCI_COREIMR_OFFSET); + + /* Make sure Card is detected in controller */ + mask = sdhci_readl(host, SDHCI_CORESTAT_OFFSET); + sdhci_writel(host, mask | SDHCI_CORESTAT_CD_SW, SDHCI_CORESTAT_OFFSET); + + return 0; +} + +int kona_sdhci_init(int dev_index, u32 min_clk, u32 quirks) +{ + int ret = 0; + u32 max_clk; + void *reg_base; + struct sdhci_host *host = NULL; + + host = (struct sdhci_host *)malloc(sizeof(struct sdhci_host)); + if (!host) { + printf("%s: sdhci host malloc fail!\n", __func__); + return -ENOMEM; + } + switch (dev_index) { + case 0: + reg_base = (void *)CONFIG_SYS_SDIO_BASE0; + ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO0_MAX_CLK, + &max_clk); + break; + case 1: + reg_base = (void *)CONFIG_SYS_SDIO_BASE1; + ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO1_MAX_CLK, + &max_clk); + break; + case 2: + reg_base = (void *)CONFIG_SYS_SDIO_BASE2; + ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO2_MAX_CLK, + &max_clk); + break; + case 3: + reg_base = (void *)CONFIG_SYS_SDIO_BASE3; + ret = clk_sdio_enable(reg_base, CONFIG_SYS_SDIO3_MAX_CLK, + &max_clk); + break; + default: + printf("%s: sdio dev index %d not supported\n", + __func__, dev_index); + ret = -EINVAL; + } + if (ret) + return ret; + + host->name = "kona-sdhci"; + host->ioaddr = reg_base; + host->quirks = quirks; + host->host_caps = MMC_MODE_HC; + + if (init_mmc_core(host)) + return -EINVAL; + + if (quirks & SDHCI_QUIRK_REG32_RW) + host->version = sdhci_readl(host, SDHCI_HOST_VERSION - 2) >> 16; + else + host->version = sdhci_readw(host, SDHCI_HOST_VERSION); + + add_sdhci(host, max_clk, min_clk); + return ret; +}