259 lines
6.5 KiB
C
259 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2012 SAMSUNG Electronics
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* Jaehoon Chung <jh80.chung@samsung.com>
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*/
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#include <common.h>
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#include <dwmmc.h>
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#include <fdtdec.h>
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#include <linux/libfdt.h>
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#include <malloc.h>
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#include <errno.h>
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#include <asm/arch/dwmmc.h>
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#include <asm/arch/clk.h>
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#include <asm/arch/pinmux.h>
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#include <asm/arch/power.h>
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#include <asm/gpio.h>
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#define DWMMC_MAX_CH_NUM 4
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#define DWMMC_MAX_FREQ 52000000
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#define DWMMC_MIN_FREQ 400000
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#define DWMMC_MMC0_SDR_TIMING_VAL 0x03030001
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#define DWMMC_MMC2_SDR_TIMING_VAL 0x03020001
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#ifdef CONFIG_DM_MMC
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#include <dm.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct exynos_mmc_plat {
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struct mmc_config cfg;
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struct mmc mmc;
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};
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#endif
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/* Exynos implmentation specific drver private data */
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struct dwmci_exynos_priv_data {
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#ifdef CONFIG_DM_MMC
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struct dwmci_host host;
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#endif
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u32 sdr_timing;
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};
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/*
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* Function used as callback function to initialise the
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* CLKSEL register for every mmc channel.
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*/
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static int exynos_dwmci_clksel(struct dwmci_host *host)
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{
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#ifdef CONFIG_DM_MMC
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struct dwmci_exynos_priv_data *priv =
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container_of(host, struct dwmci_exynos_priv_data, host);
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#else
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struct dwmci_exynos_priv_data *priv = host->priv;
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#endif
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dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);
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return 0;
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}
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unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq)
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{
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unsigned long sclk;
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int8_t clk_div;
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/*
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* Since SDCLKIN is divided inside controller by the DIVRATIO
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* value set in the CLKSEL register, we need to use the same output
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* clock value to calculate the CLKDIV value.
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* as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1)
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*/
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clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT)
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& DWMCI_DIVRATIO_MASK) + 1;
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sclk = get_mmc_clk(host->dev_index);
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/*
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* Assume to know divider value.
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* When clock unit is broken, need to set "host->div"
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*/
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return sclk / clk_div / (host->div + 1);
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}
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static void exynos_dwmci_board_init(struct dwmci_host *host)
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{
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struct dwmci_exynos_priv_data *priv = host->priv;
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if (host->quirks & DWMCI_QUIRK_DISABLE_SMU) {
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dwmci_writel(host, EMMCP_MPSBEGIN0, 0);
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dwmci_writel(host, EMMCP_SEND0, 0);
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dwmci_writel(host, EMMCP_CTRL0,
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MPSCTRL_SECURE_READ_BIT |
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MPSCTRL_SECURE_WRITE_BIT |
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MPSCTRL_NON_SECURE_READ_BIT |
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MPSCTRL_NON_SECURE_WRITE_BIT | MPSCTRL_VALID);
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}
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/* Set to timing value at initial time */
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if (priv->sdr_timing)
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exynos_dwmci_clksel(host);
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}
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static int exynos_dwmci_core_init(struct dwmci_host *host)
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{
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unsigned int div;
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unsigned long freq, sclk;
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if (host->bus_hz)
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freq = host->bus_hz;
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else
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freq = DWMMC_MAX_FREQ;
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/* request mmc clock vlaue of 52MHz. */
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sclk = get_mmc_clk(host->dev_index);
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div = DIV_ROUND_UP(sclk, freq);
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/* set the clock divisor for mmc */
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set_mmc_clk(host->dev_index, div);
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host->name = "EXYNOS DWMMC";
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#ifdef CONFIG_EXYNOS5420
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host->quirks = DWMCI_QUIRK_DISABLE_SMU;
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#endif
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host->board_init = exynos_dwmci_board_init;
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host->caps = MMC_MODE_DDR_52MHz;
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host->clksel = exynos_dwmci_clksel;
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host->get_mmc_clk = exynos_dwmci_get_clk;
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#ifndef CONFIG_DM_MMC
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/* Add the mmc channel to be registered with mmc core */
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if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
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printf("DWMMC%d registration failed\n", host->dev_index);
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return -1;
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}
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#endif
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return 0;
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}
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static int do_dwmci_init(struct dwmci_host *host)
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{
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int flag, err;
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flag = host->buswidth == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
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err = exynos_pinmux_config(host->dev_id, flag);
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if (err) {
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printf("DWMMC%d not configure\n", host->dev_index);
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return err;
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}
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return exynos_dwmci_core_init(host);
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}
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static int exynos_dwmci_get_config(const void *blob, int node,
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struct dwmci_host *host,
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struct dwmci_exynos_priv_data *priv)
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{
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int err = 0;
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u32 base, timing[3];
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/* Extract device id for each mmc channel */
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host->dev_id = pinmux_decode_periph_id(blob, node);
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host->dev_index = fdtdec_get_int(blob, node, "index", host->dev_id);
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if (host->dev_index == host->dev_id)
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host->dev_index = host->dev_id - PERIPH_ID_SDMMC0;
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if (host->dev_index > 4) {
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printf("DWMMC%d: Can't get the dev index\n", host->dev_index);
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return -EINVAL;
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}
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/* Get the bus width from the device node (Default is 4bit buswidth) */
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host->buswidth = fdtdec_get_int(blob, node, "samsung,bus-width", 4);
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/* Set the base address from the device node */
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base = fdtdec_get_addr(blob, node, "reg");
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if (!base) {
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printf("DWMMC%d: Can't get base address\n", host->dev_index);
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return -EINVAL;
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}
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host->ioaddr = (void *)base;
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/* Extract the timing info from the node */
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err = fdtdec_get_int_array(blob, node, "samsung,timing", timing, 3);
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if (err) {
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printf("DWMMC%d: Can't get sdr-timings for devider\n",
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host->dev_index);
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return -EINVAL;
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}
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priv->sdr_timing = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
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DWMCI_SET_DRV_CLK(timing[1]) |
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DWMCI_SET_DIV_RATIO(timing[2]));
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/* sdr_timing didn't assigned anything, use the default value */
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if (!priv->sdr_timing) {
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if (host->dev_index == 0)
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priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL;
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else if (host->dev_index == 2)
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priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL;
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}
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host->fifoth_val = fdtdec_get_int(blob, node, "fifoth_val", 0);
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host->bus_hz = fdtdec_get_int(blob, node, "bus_hz", 0);
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host->div = fdtdec_get_int(blob, node, "div", 0);
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return 0;
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}
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#ifdef CONFIG_DM_MMC
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static int exynos_dwmmc_probe(struct udevice *dev)
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{
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struct exynos_mmc_plat *plat = dev_get_plat(dev);
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struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
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struct dwmci_exynos_priv_data *priv = dev_get_priv(dev);
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struct dwmci_host *host = &priv->host;
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int err;
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err = exynos_dwmci_get_config(gd->fdt_blob, dev_of_offset(dev), host,
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priv);
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if (err)
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return err;
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err = do_dwmci_init(host);
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if (err)
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return err;
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dwmci_setup_cfg(&plat->cfg, host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ);
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host->mmc = &plat->mmc;
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host->mmc->priv = &priv->host;
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host->priv = dev;
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upriv->mmc = host->mmc;
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return dwmci_probe(dev);
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}
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static int exynos_dwmmc_bind(struct udevice *dev)
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{
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struct exynos_mmc_plat *plat = dev_get_plat(dev);
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return dwmci_bind(dev, &plat->mmc, &plat->cfg);
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}
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static const struct udevice_id exynos_dwmmc_ids[] = {
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{ .compatible = "samsung,exynos4412-dw-mshc" },
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{ .compatible = "samsung,exynos-dwmmc" },
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{ }
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};
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U_BOOT_DRIVER(exynos_dwmmc_drv) = {
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.name = "exynos_dwmmc",
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.id = UCLASS_MMC,
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.of_match = exynos_dwmmc_ids,
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.bind = exynos_dwmmc_bind,
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.ops = &dm_dwmci_ops,
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.probe = exynos_dwmmc_probe,
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.priv_auto = sizeof(struct dwmci_exynos_priv_data),
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.plat_auto = sizeof(struct exynos_mmc_plat),
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};
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#endif
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