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The only generic interface to execute asynchronously in the BH context is tasklet; however, it's marked deprecated and has some design flaws. To replace tasklets, BH workqueue support was recently added. A BH workqueue behaves similarly to regular workqueues except that the queued work items are executed in the BH context. This patch converts the SDHI driver from tasklet to BH workqueue. Based on the work done by Tejun Heo <tj@kernel.org> Signed-off-by: Allen Pais <allen.lkml@gmail.com> [wsa: fixed build faliures, corrected whitespace issues] Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Link: https://lore.kernel.org/r/20240626085015.32171-2-wsa+renesas@sang-engineering.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Renesas Mobile SDHI
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*
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* Copyright (C) 2017 Horms Solutions Ltd., Simon Horman
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* Copyright (C) 2017-19 Renesas Electronics Corporation
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*/
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#ifndef RENESAS_SDHI_H
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#define RENESAS_SDHI_H
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#include <linux/dmaengine.h>
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#include <linux/platform_device.h>
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#include <linux/workqueue.h>
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#include "tmio_mmc.h"
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struct renesas_sdhi_scc {
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unsigned long clk_rate; /* clock rate for SDR104 */
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u32 tap; /* sampling clock position for SDR104/HS400 (8 TAP) */
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u32 tap_hs400_4tap; /* sampling clock position for HS400 (4 TAP) */
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};
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#define SDHI_FLAG_NEED_CLKH_FALLBACK BIT(0)
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struct renesas_sdhi_of_data {
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unsigned long tmio_flags;
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u32 tmio_ocr_mask;
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unsigned long capabilities;
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unsigned long capabilities2;
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enum dma_slave_buswidth dma_buswidth;
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dma_addr_t dma_rx_offset;
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unsigned int bus_shift;
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int scc_offset;
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struct renesas_sdhi_scc *taps;
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int taps_num;
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unsigned int max_blk_count;
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unsigned short max_segs;
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unsigned long sdhi_flags;
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};
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#define SDHI_CALIB_TABLE_MAX 32
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#define sdhi_has_quirk(p, q) ((p)->quirks && (p)->quirks->q)
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struct renesas_sdhi_quirks {
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bool hs400_disabled;
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bool hs400_4taps;
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bool fixed_addr_mode;
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bool dma_one_rx_only;
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bool manual_tap_correction;
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bool old_info1_layout;
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u32 hs400_bad_taps;
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const u8 (*hs400_calib_table)[SDHI_CALIB_TABLE_MAX];
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};
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struct renesas_sdhi_of_data_with_quirks {
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const struct renesas_sdhi_of_data *of_data;
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const struct renesas_sdhi_quirks *quirks;
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};
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/* We want both end_flags to be set before we mark DMA as finished */
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#define SDHI_DMA_END_FLAG_DMA 0
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#define SDHI_DMA_END_FLAG_ACCESS 1
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struct renesas_sdhi_dma {
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unsigned long end_flags;
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enum dma_slave_buswidth dma_buswidth;
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dma_filter_fn filter;
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void (*enable)(struct tmio_mmc_host *host, bool enable);
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struct completion dma_dataend;
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struct work_struct dma_complete;
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};
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struct renesas_sdhi {
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struct clk *clk;
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struct clk *clkh;
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struct clk *clk_cd;
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struct tmio_mmc_data mmc_data;
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struct renesas_sdhi_dma dma_priv;
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const struct renesas_sdhi_quirks *quirks;
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struct pinctrl *pinctrl;
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struct pinctrl_state *pins_default, *pins_uhs;
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void __iomem *scc_ctl;
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u32 scc_tappos;
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u32 scc_tappos_hs400;
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const u8 *adjust_hs400_calib_table;
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bool needs_adjust_hs400;
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/* Tuning values: 1 for success, 0 for failure */
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DECLARE_BITMAP(taps, BITS_PER_LONG);
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/* Sampling data comparison: 1 for match, 0 for mismatch */
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DECLARE_BITMAP(smpcmp, BITS_PER_LONG);
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unsigned int tap_num;
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unsigned int tap_set;
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struct reset_control *rstc;
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struct tmio_mmc_host *host;
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};
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#define host_to_priv(host) \
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container_of((host)->pdata, struct renesas_sdhi, mmc_data)
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int renesas_sdhi_probe(struct platform_device *pdev,
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const struct tmio_mmc_dma_ops *dma_ops,
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const struct renesas_sdhi_of_data *of_data,
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const struct renesas_sdhi_quirks *quirks);
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void renesas_sdhi_remove(struct platform_device *pdev);
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#endif
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