diff options
Diffstat (limited to 'drivers/mmc/host/dw_mmc-zx.c')
| -rw-r--r-- | drivers/mmc/host/dw_mmc-zx.c | 234 |
1 files changed, 0 insertions, 234 deletions
diff --git a/drivers/mmc/host/dw_mmc-zx.c b/drivers/mmc/host/dw_mmc-zx.c deleted file mode 100644 index 51bcc6332f3a..000000000000 --- a/drivers/mmc/host/dw_mmc-zx.c +++ /dev/null @@ -1,234 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * ZX Specific Extensions for Synopsys DW Multimedia Card Interface driver - * - * Copyright (C) 2016, Linaro Ltd. - * Copyright (C) 2016, ZTE Corp. - */ - -#include <linux/clk.h> -#include <linux/mfd/syscon.h> -#include <linux/mmc/host.h> -#include <linux/mmc/mmc.h> -#include <linux/module.h> -#include <linux/of.h> -#include <linux/platform_device.h> -#include <linux/pm_runtime.h> -#include <linux/regmap.h> -#include <linux/slab.h> - -#include "dw_mmc.h" -#include "dw_mmc-pltfm.h" -#include "dw_mmc-zx.h" - -struct dw_mci_zx_priv_data { - struct regmap *sysc_base; -}; - -enum delay_type { - DELAY_TYPE_READ, /* read dqs delay */ - DELAY_TYPE_CLK, /* clk sample delay */ -}; - -static int dw_mci_zx_emmc_set_delay(struct dw_mci *host, unsigned int delay, - enum delay_type dflag) -{ - struct dw_mci_zx_priv_data *priv = host->priv; - struct regmap *sysc_base = priv->sysc_base; - unsigned int clksel; - unsigned int loop = 1000; - int ret; - - if (!sysc_base) - return -EINVAL; - - ret = regmap_update_bits(sysc_base, LB_AON_EMMC_CFG_REG0, - PARA_HALF_CLK_MODE | PARA_DLL_BYPASS_MODE | - PARA_PHASE_DET_SEL_MASK | - PARA_DLL_LOCK_NUM_MASK | - DLL_REG_SET | PARA_DLL_START_MASK, - PARA_DLL_START(4) | PARA_DLL_LOCK_NUM(4)); - if (ret) - return ret; - - ret = regmap_read(sysc_base, LB_AON_EMMC_CFG_REG1, &clksel); - if (ret) - return ret; - - if (dflag == DELAY_TYPE_CLK) { - clksel &= ~CLK_SAMP_DELAY_MASK; - clksel |= CLK_SAMP_DELAY(delay); - } else { - clksel &= ~READ_DQS_DELAY_MASK; - clksel |= READ_DQS_DELAY(delay); - } - - regmap_write(sysc_base, LB_AON_EMMC_CFG_REG1, clksel); - regmap_update_bits(sysc_base, LB_AON_EMMC_CFG_REG0, - PARA_DLL_START_MASK | PARA_DLL_LOCK_NUM_MASK | - DLL_REG_SET, - PARA_DLL_START(4) | PARA_DLL_LOCK_NUM(4) | - DLL_REG_SET); - - do { - ret = regmap_read(sysc_base, LB_AON_EMMC_CFG_REG2, &clksel); - if (ret) - return ret; - - } while (--loop && !(clksel & ZX_DLL_LOCKED)); - - if (!loop) { - dev_err(host->dev, "Error: %s dll lock fail\n", __func__); - return -EIO; - } - - return 0; -} - -static int dw_mci_zx_emmc_execute_tuning(struct dw_mci_slot *slot, u32 opcode) -{ - struct dw_mci *host = slot->host; - struct mmc_host *mmc = slot->mmc; - int ret, len = 0, start = 0, end = 0, delay, best = 0; - - for (delay = 1; delay < 128; delay++) { - ret = dw_mci_zx_emmc_set_delay(host, delay, DELAY_TYPE_CLK); - if (!ret && mmc_send_tuning(mmc, opcode, NULL)) { - if (start >= 0) { - end = delay - 1; - /* check and update longest good range */ - if ((end - start) > len) { - best = (start + end) >> 1; - len = end - start; - } - } - start = -1; - end = 0; - continue; - } - if (start < 0) - start = delay; - } - - if (start >= 0) { - end = delay - 1; - if ((end - start) > len) { - best = (start + end) >> 1; - len = end - start; - } - } - if (best < 0) - return -EIO; - - dev_info(host->dev, "%s best range: start %d end %d\n", __func__, - start, end); - return dw_mci_zx_emmc_set_delay(host, best, DELAY_TYPE_CLK); -} - -static int dw_mci_zx_prepare_hs400_tuning(struct dw_mci *host, - struct mmc_ios *ios) -{ - int ret; - - /* config phase shift as 90 degree */ - ret = dw_mci_zx_emmc_set_delay(host, 32, DELAY_TYPE_READ); - if (ret < 0) - return -EIO; - - return 0; -} - -static int dw_mci_zx_execute_tuning(struct dw_mci_slot *slot, u32 opcode) -{ - struct dw_mci *host = slot->host; - - if (host->verid == 0x290a) /* only for emmc */ - return dw_mci_zx_emmc_execute_tuning(slot, opcode); - /* TODO: Add 0x210a dedicated tuning for sd/sdio */ - - return 0; -} - -static int dw_mci_zx_parse_dt(struct dw_mci *host) -{ - struct device_node *np = host->dev->of_node; - struct device_node *node; - struct dw_mci_zx_priv_data *priv; - struct regmap *sysc_base; - - /* syscon is needed only by emmc */ - node = of_parse_phandle(np, "zte,aon-syscon", 0); - if (node) { - sysc_base = syscon_node_to_regmap(node); - of_node_put(node); - - if (IS_ERR(sysc_base)) - return dev_err_probe(host->dev, PTR_ERR(sysc_base), - "Can't get syscon\n"); - } else { - return 0; - } - - priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL); - if (!priv) - return -ENOMEM; - priv->sysc_base = sysc_base; - host->priv = priv; - - return 0; -} - -static unsigned long zx_dwmmc_caps[3] = { - MMC_CAP_CMD23, - MMC_CAP_CMD23, - MMC_CAP_CMD23, -}; - -static const struct dw_mci_drv_data zx_drv_data = { - .caps = zx_dwmmc_caps, - .num_caps = ARRAY_SIZE(zx_dwmmc_caps), - .execute_tuning = dw_mci_zx_execute_tuning, - .prepare_hs400_tuning = dw_mci_zx_prepare_hs400_tuning, - .parse_dt = dw_mci_zx_parse_dt, -}; - -static const struct of_device_id dw_mci_zx_match[] = { - { .compatible = "zte,zx296718-dw-mshc", .data = &zx_drv_data}, - {}, -}; -MODULE_DEVICE_TABLE(of, dw_mci_zx_match); - -static int dw_mci_zx_probe(struct platform_device *pdev) -{ - const struct dw_mci_drv_data *drv_data; - const struct of_device_id *match; - - match = of_match_node(dw_mci_zx_match, pdev->dev.of_node); - drv_data = match->data; - - return dw_mci_pltfm_register(pdev, drv_data); -} - -static const struct dev_pm_ops dw_mci_zx_dev_pm_ops = { - SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, - pm_runtime_force_resume) - SET_RUNTIME_PM_OPS(dw_mci_runtime_suspend, - dw_mci_runtime_resume, - NULL) -}; - -static struct platform_driver dw_mci_zx_pltfm_driver = { - .probe = dw_mci_zx_probe, - .remove = dw_mci_pltfm_remove, - .driver = { - .name = "dwmmc_zx", - .probe_type = PROBE_PREFER_ASYNCHRONOUS, - .of_match_table = dw_mci_zx_match, - .pm = &dw_mci_zx_dev_pm_ops, - }, -}; - -module_platform_driver(dw_mci_zx_pltfm_driver); - -MODULE_DESCRIPTION("ZTE emmc/sd driver"); -MODULE_LICENSE("GPL v2"); |