diff options
Diffstat (limited to 'drivers/mmc/host/sdhci-sirf.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-sirf.c | 235 |
1 files changed, 0 insertions, 235 deletions
diff --git a/drivers/mmc/host/sdhci-sirf.c b/drivers/mmc/host/sdhci-sirf.c deleted file mode 100644 index e9b347b3af7e..000000000000 --- a/drivers/mmc/host/sdhci-sirf.c +++ /dev/null @@ -1,235 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * SDHCI support for SiRF primaII and marco SoCs - * - * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. - */ - -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/mmc/host.h> -#include <linux/module.h> -#include <linux/of.h> -#include <linux/mmc/slot-gpio.h> -#include "sdhci-pltfm.h" - -#define SDHCI_CLK_DELAY_SETTING 0x4C -#define SDHCI_SIRF_8BITBUS BIT(3) -#define SIRF_TUNING_COUNT 16384 - -static void sdhci_sirf_set_bus_width(struct sdhci_host *host, int width) -{ - u8 ctrl; - - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); - ctrl &= ~(SDHCI_CTRL_4BITBUS | SDHCI_SIRF_8BITBUS); - - /* - * CSR atlas7 and prima2 SD host version is not 3.0 - * 8bit-width enable bit of CSR SD hosts is 3, - * while stardard hosts use bit 5 - */ - if (width == MMC_BUS_WIDTH_8) - ctrl |= SDHCI_SIRF_8BITBUS; - else if (width == MMC_BUS_WIDTH_4) - ctrl |= SDHCI_CTRL_4BITBUS; - - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); -} - -static u32 sdhci_sirf_readl_le(struct sdhci_host *host, int reg) -{ - u32 val = readl(host->ioaddr + reg); - - if (unlikely((reg == SDHCI_CAPABILITIES_1) && - (host->mmc->caps & MMC_CAP_UHS_SDR50))) { - /* fake CAP_1 register */ - val = SDHCI_SUPPORT_DDR50 | - SDHCI_SUPPORT_SDR50 | SDHCI_USE_SDR50_TUNING; - } - - if (unlikely(reg == SDHCI_SLOT_INT_STATUS)) { - u32 prss = val; - /* fake chips as V3.0 host conreoller */ - prss &= ~(0xFF << 16); - val = prss | (SDHCI_SPEC_300 << 16); - } - return val; -} - -static u16 sdhci_sirf_readw_le(struct sdhci_host *host, int reg) -{ - u16 ret = 0; - - ret = readw(host->ioaddr + reg); - - if (unlikely(reg == SDHCI_HOST_VERSION)) { - ret = readw(host->ioaddr + SDHCI_HOST_VERSION); - ret |= SDHCI_SPEC_300; - } - - return ret; -} - -static int sdhci_sirf_execute_tuning(struct sdhci_host *host, u32 opcode) -{ - int tuning_seq_cnt = 3; - int phase; - u8 tuned_phase_cnt = 0; - int rc = 0, longest_range = 0; - int start = -1, end = 0, tuning_value = -1, range = 0; - u16 clock_setting; - struct mmc_host *mmc = host->mmc; - - clock_setting = sdhci_readw(host, SDHCI_CLK_DELAY_SETTING); - clock_setting &= ~0x3fff; - -retry: - phase = 0; - tuned_phase_cnt = 0; - do { - sdhci_writel(host, - clock_setting | phase, - SDHCI_CLK_DELAY_SETTING); - - if (!mmc_send_tuning(mmc, opcode, NULL)) { - /* Tuning is successful at this tuning point */ - tuned_phase_cnt++; - dev_dbg(mmc_dev(mmc), "%s: Found good phase = %d\n", - mmc_hostname(mmc), phase); - if (start == -1) - start = phase; - end = phase; - range++; - if (phase == (SIRF_TUNING_COUNT - 1) - && range > longest_range) - tuning_value = (start + end) / 2; - } else { - dev_dbg(mmc_dev(mmc), "%s: Found bad phase = %d\n", - mmc_hostname(mmc), phase); - if (range > longest_range) { - tuning_value = (start + end) / 2; - longest_range = range; - } - start = -1; - end = range = 0; - } - } while (++phase < SIRF_TUNING_COUNT); - - if (tuned_phase_cnt && tuning_value > 0) { - /* - * Finally set the selected phase in delay - * line hw block. - */ - phase = tuning_value; - sdhci_writel(host, - clock_setting | phase, - SDHCI_CLK_DELAY_SETTING); - - dev_dbg(mmc_dev(mmc), "%s: Setting the tuning phase to %d\n", - mmc_hostname(mmc), phase); - } else { - if (--tuning_seq_cnt) - goto retry; - /* Tuning failed */ - dev_dbg(mmc_dev(mmc), "%s: No tuning point found\n", - mmc_hostname(mmc)); - rc = -EIO; - } - - return rc; -} - -static const struct sdhci_ops sdhci_sirf_ops = { - .read_l = sdhci_sirf_readl_le, - .read_w = sdhci_sirf_readw_le, - .platform_execute_tuning = sdhci_sirf_execute_tuning, - .set_clock = sdhci_set_clock, - .get_max_clock = sdhci_pltfm_clk_get_max_clock, - .set_bus_width = sdhci_sirf_set_bus_width, - .reset = sdhci_reset, - .set_uhs_signaling = sdhci_set_uhs_signaling, -}; - -static const struct sdhci_pltfm_data sdhci_sirf_pdata = { - .ops = &sdhci_sirf_ops, - .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | - SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | - SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN | - SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS, - .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, -}; - -static int sdhci_sirf_probe(struct platform_device *pdev) -{ - struct sdhci_host *host; - struct sdhci_pltfm_host *pltfm_host; - struct clk *clk; - int ret; - - clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(clk)) { - dev_err(&pdev->dev, "unable to get clock"); - return PTR_ERR(clk); - } - - host = sdhci_pltfm_init(pdev, &sdhci_sirf_pdata, 0); - if (IS_ERR(host)) - return PTR_ERR(host); - - pltfm_host = sdhci_priv(host); - pltfm_host->clk = clk; - - sdhci_get_of_property(pdev); - - ret = clk_prepare_enable(pltfm_host->clk); - if (ret) - goto err_clk_prepare; - - ret = sdhci_add_host(host); - if (ret) - goto err_sdhci_add; - - /* - * We must request the IRQ after sdhci_add_host(), as the tasklet only - * gets setup in sdhci_add_host() and we oops. - */ - ret = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0); - if (ret == -EPROBE_DEFER) - goto err_request_cd; - if (!ret) - mmc_gpiod_request_cd_irq(host->mmc); - - return 0; - -err_request_cd: - sdhci_remove_host(host, 0); -err_sdhci_add: - clk_disable_unprepare(pltfm_host->clk); -err_clk_prepare: - sdhci_pltfm_free(pdev); - return ret; -} - -static const struct of_device_id sdhci_sirf_of_match[] = { - { .compatible = "sirf,prima2-sdhc" }, - { } -}; -MODULE_DEVICE_TABLE(of, sdhci_sirf_of_match); - -static struct platform_driver sdhci_sirf_driver = { - .driver = { - .name = "sdhci-sirf", - .probe_type = PROBE_PREFER_ASYNCHRONOUS, - .of_match_table = sdhci_sirf_of_match, - .pm = &sdhci_pltfm_pmops, - }, - .probe = sdhci_sirf_probe, - .remove = sdhci_pltfm_unregister, -}; - -module_platform_driver(sdhci_sirf_driver); - -MODULE_DESCRIPTION("SDHCI driver for SiRFprimaII/SiRFmarco"); -MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); -MODULE_LICENSE("GPL v2"); |