diff options
Diffstat (limited to 'drivers/mmc/host/mmci_qcom_dml.c')
| -rw-r--r-- | drivers/mmc/host/mmci_qcom_dml.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/mmc/host/mmci_qcom_dml.c b/drivers/mmc/host/mmci_qcom_dml.c new file mode 100644 index 000000000000..2b7fc3764803 --- /dev/null +++ b/drivers/mmc/host/mmci_qcom_dml.c @@ -0,0 +1,177 @@ +/* + * + * Copyright (c) 2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#include <linux/of.h> +#include <linux/of_dma.h> +#include <linux/bitops.h> +#include <linux/mmc/host.h> +#include <linux/mmc/card.h> +#include "mmci.h" + +/* Registers */ +#define DML_CONFIG 0x00 +#define PRODUCER_CRCI_MSK GENMASK(1, 0) +#define PRODUCER_CRCI_DISABLE 0 +#define PRODUCER_CRCI_X_SEL BIT(0) +#define PRODUCER_CRCI_Y_SEL BIT(1) +#define CONSUMER_CRCI_MSK GENMASK(3, 2) +#define CONSUMER_CRCI_DISABLE 0 +#define CONSUMER_CRCI_X_SEL BIT(2) +#define CONSUMER_CRCI_Y_SEL BIT(3) +#define PRODUCER_TRANS_END_EN BIT(4) +#define BYPASS BIT(16) +#define DIRECT_MODE BIT(17) +#define INFINITE_CONS_TRANS BIT(18) + +#define DML_SW_RESET 0x08 +#define DML_PRODUCER_START 0x0c +#define DML_CONSUMER_START 0x10 +#define DML_PRODUCER_PIPE_LOGICAL_SIZE 0x14 +#define DML_CONSUMER_PIPE_LOGICAL_SIZE 0x18 +#define DML_PIPE_ID 0x1c +#define PRODUCER_PIPE_ID_SHFT 0 +#define PRODUCER_PIPE_ID_MSK GENMASK(4, 0) +#define CONSUMER_PIPE_ID_SHFT 16 +#define CONSUMER_PIPE_ID_MSK GENMASK(20, 16) + +#define DML_PRODUCER_BAM_BLOCK_SIZE 0x24 +#define DML_PRODUCER_BAM_TRANS_SIZE 0x28 + +/* other definitions */ +#define PRODUCER_PIPE_LOGICAL_SIZE 4096 +#define CONSUMER_PIPE_LOGICAL_SIZE 4096 + +#define DML_OFFSET 0x800 + +void dml_start_xfer(struct mmci_host *host, struct mmc_data *data) +{ + u32 config; + void __iomem *base = host->base + DML_OFFSET; + + if (data->flags & MMC_DATA_READ) { + /* Read operation: configure DML for producer operation */ + /* Set producer CRCI-x and disable consumer CRCI */ + config = readl_relaxed(base + DML_CONFIG); + config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_X_SEL; + config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_DISABLE; + writel_relaxed(config, base + DML_CONFIG); + + /* Set the Producer BAM block size */ + writel_relaxed(data->blksz, base + DML_PRODUCER_BAM_BLOCK_SIZE); + + /* Set Producer BAM Transaction size */ + writel_relaxed(data->blocks * data->blksz, + base + DML_PRODUCER_BAM_TRANS_SIZE); + /* Set Producer Transaction End bit */ + config = readl_relaxed(base + DML_CONFIG); + config |= PRODUCER_TRANS_END_EN; + writel_relaxed(config, base + DML_CONFIG); + /* Trigger producer */ + writel_relaxed(1, base + DML_PRODUCER_START); + } else { + /* Write operation: configure DML for consumer operation */ + /* Set consumer CRCI-x and disable producer CRCI*/ + config = readl_relaxed(base + DML_CONFIG); + config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_X_SEL; + config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_DISABLE; + writel_relaxed(config, base + DML_CONFIG); + /* Clear Producer Transaction End bit */ + config = readl_relaxed(base + DML_CONFIG); + config &= ~PRODUCER_TRANS_END_EN; + writel_relaxed(config, base + DML_CONFIG); + /* Trigger consumer */ + writel_relaxed(1, base + DML_CONSUMER_START); + } + + /* make sure the dml is configured before dma is triggered */ + wmb(); +} + +static int of_get_dml_pipe_index(struct device_node *np, const char *name) +{ + int index; + struct of_phandle_args dma_spec; + + index = of_property_match_string(np, "dma-names", name); + + if (index < 0) + return -ENODEV; + + if (of_parse_phandle_with_args(np, "dmas", "#dma-cells", index, + &dma_spec)) + return -ENODEV; + + if (dma_spec.args_count) + return dma_spec.args[0]; + + return -ENODEV; +} + +/* Initialize the dml hardware connected to SD Card controller */ +int dml_hw_init(struct mmci_host *host, struct device_node *np) +{ + u32 config; + void __iomem *base; + int consumer_id, producer_id; + + consumer_id = of_get_dml_pipe_index(np, "tx"); + producer_id = of_get_dml_pipe_index(np, "rx"); + + if (producer_id < 0 || consumer_id < 0) + return -ENODEV; + + base = host->base + DML_OFFSET; + + /* Reset the DML block */ + writel_relaxed(1, base + DML_SW_RESET); + + /* Disable the producer and consumer CRCI */ + config = (PRODUCER_CRCI_DISABLE | CONSUMER_CRCI_DISABLE); + /* + * Disable the bypass mode. Bypass mode will only be used + * if data transfer is to happen in PIO mode and don't + * want the BAM interface to connect with SDCC-DML. + */ + config &= ~BYPASS; + /* + * Disable direct mode as we don't DML to MASTER the AHB bus. + * BAM connected with DML should MASTER the AHB bus. + */ + config &= ~DIRECT_MODE; + /* + * Disable infinite mode transfer as we won't be doing any + * infinite size data transfers. All data transfer will be + * of finite data size. + */ + config &= ~INFINITE_CONS_TRANS; + writel_relaxed(config, base + DML_CONFIG); + + /* + * Initialize the logical BAM pipe size for producer + * and consumer. + */ + writel_relaxed(PRODUCER_PIPE_LOGICAL_SIZE, + base + DML_PRODUCER_PIPE_LOGICAL_SIZE); + writel_relaxed(CONSUMER_PIPE_LOGICAL_SIZE, + base + DML_CONSUMER_PIPE_LOGICAL_SIZE); + + /* Initialize Producer/consumer pipe id */ + writel_relaxed(producer_id | (consumer_id << CONSUMER_PIPE_ID_SHFT), + base + DML_PIPE_ID); + + /* Make sure dml intialization is finished */ + mb(); + + return 0; +} |