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6f0b7caa67
SMDK5420 has a new Security Management Unit added for dwmmc driver, hence, configuring the control registers to support booting via eMMC. Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Acked-by: Pantelis Antoniou <panto@antoniou-consulting.com>
154 lines
3.8 KiB
C
154 lines
3.8 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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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 <libfdt.h>
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#include <malloc.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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#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_CLKSEL_VAL 0x03030001
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#define DWMMC_MMC2_CLKSEL_VAL 0x03020001
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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 void exynos_dwmci_clksel(struct dwmci_host *host)
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{
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dwmci_writel(host, DWMCI_CLKSEL, host->clksel_val);
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}
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unsigned int exynos_dwmci_get_clk(int dev_index)
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{
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return get_mmc_clk(dev_index);
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}
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/*
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* This function adds the mmc channel to be registered with mmc core.
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* index - mmc channel number.
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* regbase - register base address of mmc channel specified in 'index'.
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* bus_width - operating bus width of mmc channel specified in 'index'.
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* clksel - value to be written into CLKSEL register in case of FDT.
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* NULL in case od non-FDT.
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*/
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int exynos_dwmci_add_port(int index, u32 regbase, int bus_width, u32 clksel)
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{
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struct dwmci_host *host = NULL;
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unsigned int div;
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unsigned long freq, sclk;
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host = malloc(sizeof(struct dwmci_host));
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if (!host) {
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printf("dwmci_host malloc fail!\n");
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return 1;
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}
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/* request mmc clock vlaue of 52MHz. */
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freq = 52000000;
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sclk = get_mmc_clk(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(index, div);
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host->name = "EXYNOS DWMMC";
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host->ioaddr = (void *)regbase;
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host->buswidth = bus_width;
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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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if (clksel) {
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host->clksel_val = clksel;
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} else {
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if (0 == index)
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host->clksel_val = DWMMC_MMC0_CLKSEL_VAL;
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if (2 == index)
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host->clksel_val = DWMMC_MMC2_CLKSEL_VAL;
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}
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host->clksel = exynos_dwmci_clksel;
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host->dev_index = index;
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host->get_mmc_clk = exynos_dwmci_get_clk;
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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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debug("dwmmc%d registration failed\n", index);
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return -1;
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}
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return 0;
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}
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#ifdef CONFIG_OF_CONTROL
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int exynos_dwmmc_init(const void *blob)
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{
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int index, bus_width;
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int node_list[DWMMC_MAX_CH_NUM];
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int err = 0, dev_id, flag, count, i;
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u32 clksel_val, base, timing[3];
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count = fdtdec_find_aliases_for_id(blob, "mmc",
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COMPAT_SAMSUNG_EXYNOS5_DWMMC, node_list,
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DWMMC_MAX_CH_NUM);
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for (i = 0; i < count; i++) {
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int node = node_list[i];
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if (node <= 0)
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continue;
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/* Extract device id for each mmc channel */
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dev_id = pinmux_decode_periph_id(blob, node);
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/* Get the bus width from the device node */
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bus_width = fdtdec_get_int(blob, node, "samsung,bus-width", 0);
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if (bus_width <= 0) {
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debug("DWMMC: Can't get bus-width\n");
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return -1;
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}
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if (8 == bus_width)
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flag = PINMUX_FLAG_8BIT_MODE;
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else
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flag = PINMUX_FLAG_NONE;
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/* config pinmux for each mmc channel */
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err = exynos_pinmux_config(dev_id, flag);
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if (err) {
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debug("DWMMC not configured\n");
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return err;
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}
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index = dev_id - PERIPH_ID_SDMMC0;
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/* Get 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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debug("DWMMC: Can't get base address\n");
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return -1;
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}
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/* Extract the timing info from the node */
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err = fdtdec_get_int_array(blob, node, "samsung,timing",
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timing, 3);
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if (err) {
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debug("Can't get sdr-timings for divider\n");
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return -1;
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}
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clksel_val = (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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/* Initialise each mmc channel */
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err = exynos_dwmci_add_port(index, base, bus_width, clksel_val);
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if (err)
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debug("dwmmc Channel-%d init failed\n", index);
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}
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return 0;
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}
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#endif
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