/* * * 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; }