+++ /dev/null
-// 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");
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _DW_MMC_ZX_H_
-#define _DW_MMC_ZX_H_
-
-/* ZX296718 SoC specific DLL register offset. */
-#define LB_AON_EMMC_CFG_REG0 0x1B0
-#define LB_AON_EMMC_CFG_REG1 0x1B4
-#define LB_AON_EMMC_CFG_REG2 0x1B8
-
-/* LB_AON_EMMC_CFG_REG0 register defines */
-#define PARA_DLL_START(x) ((x) & 0xFF)
-#define PARA_DLL_START_MASK 0xFF
-#define DLL_REG_SET BIT(8)
-#define PARA_DLL_LOCK_NUM(x) (((x) & 7) << 16)
-#define PARA_DLL_LOCK_NUM_MASK (7 << 16)
-#define PARA_PHASE_DET_SEL(x) (((x) & 7) << 20)
-#define PARA_PHASE_DET_SEL_MASK (7 << 20)
-#define PARA_DLL_BYPASS_MODE BIT(23)
-#define PARA_HALF_CLK_MODE BIT(24)
-
-/* LB_AON_EMMC_CFG_REG1 register defines */
-#define READ_DQS_DELAY(x) ((x) & 0x7F)
-#define READ_DQS_DELAY_MASK (0x7F)
-#define READ_DQS_BYPASS_MODE BIT(7)
-#define CLK_SAMP_DELAY(x) (((x) & 0x7F) << 8)
-#define CLK_SAMP_DELAY_MASK (0x7F << 8)
-#define CLK_SAMP_BYPASS_MODE BIT(15)
-
-/* LB_AON_EMMC_CFG_REG2 register defines */
-#define ZX_DLL_LOCKED BIT(2)
-
-#endif /* _DW_MMC_ZX_H_ */
projects / linux-2.6-microblaze.git / commitdiff