[U-Boot] [PATCH V3 4/9] EXYNOS5: DWMMC: Added FDT support for DWMMC
Jaehoon Chung
jh80.chung at samsung.com
Thu Jan 3 07:48:48 CET 2013
Hi Amar,
..snip..
>>> }
>>>
>>> int exynos_dwmci_init(u32 regbase, int bus_width, int index)
>>> {
>>> struct dwmci_host *host = NULL;
>>> + int dev_id = 0;
>>> host = malloc(sizeof(struct dwmci_host));
>>> if (!host) {
>>> printf("dwmci_host malloc fail!\n");
>>> return 1;
>>> }
>>> + /* Convert index into corresponding peripheral ID */
>>> + dev_id = index + PERIPH_ID_SDMMC0;
>> Is it right at every case?
>>
>
> Yes, it is right in every case.
>
> Consider the finction "int exynos_dwmci_init(u32 regbase, int bus_width,
> int index)"
> If the input argument 'index' is between (0-3), then the statement "dev_id
> = index + PERIPH_ID_SDMMC0;" works good.
>
> So, the function exynos_dwmci_init(u32 regbase, int bus_width, int index)
> is being called as below
> 1) FDT Case:
> The function exynos_dwmmc_init() calls exynos_dwmmc_init()
> The dev_id is extracted from arch/arm/dts/exynos5250.dtsi. The dev_id is
> nothing but the interrupt number.
> dwmmc0 - dev_id = 75
> dwmmc1 - dev_id = 76
> dwmmc2 - dev_id = 77
> dwmmc3 - dev_id = 78
>
> At same time the enum values are (Refer
> "arch/arm/include/asm/arch-exynos/periph.h")
> PERIPH_ID_SDMMC0 = 75,
> PERIPH_ID_SDMMC1,
> PERIPH_ID_SDMMC2,
> PERIPH_ID_SDMMC3,
>
> Here "index = dev_id - PERIPH_ID_SDMMC0" works good for all channels
> (mmc0 - mmc3)
>
> As proper values are mentioned in arch/arm/dts/exynos5250.dtsi, proper
> values of "index" (i.e 0 - 3) will be computed here.
>
> 2) Non-FDT case:
> The function board_mmc_init() calls exynos_dwmmc_init() as shown below
> int board_mmc_init(bd_t *bis)
> {
> ....
> ....
> /*EMMC: dwmmc Channel-0 with 8 bit bus width */
> err = exynos_dwmmc_init(0, 8);
> }
> Here the coder shall ensure to pass proper index number (0 to 3) for porper
> working.
Sorry, i confused the dev_id and dev_index..Thank you for explanation.
Best Regards,
Jaehoon Chung
>
>
>> > +
>>> + /* set the clock divisor - clk_div_fsys for mmc */
>>> + if (exynos5_mmc_set_clk_div(dev_id)) {
>>> + debug("mmc clock div set failed\n");
>>> + return -1;
>>> + }
>>>
>>> host->name = EXYNOS_NAME;
>>> host->ioaddr = (void *)regbase;
>>> host->buswidth = bus_width;
>>> +#ifdef CONFIG_OF_CONTROL
>>> + host->clksel_val = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
>>> + DWMCI_SET_DRV_CLK(timing[1]) |
>>> + DWMCI_SET_DIV_RATIO(timing[2]));
>>> +#else
>>> + if (0 == index)
>>> + host->clksel_val = DWMMC_MMC0_CLKSEL_VAL;
>>> + if (2 == index)
>>> + host->clksel_val = DWMMC_MMC2_CLKSEL_VAL;
>>> +#endif
>>> host->clksel = exynos_dwmci_clksel;
>>> host->dev_index = index;
>>> -
>>> - add_dwmci(host, 52000000, 400000);
>>> + host->mmc_clk = exynos_dwmci_get_clk;
>>> + /* Add the mmc chennel to be registered with mmc core */
>>> + add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ);
>>>
>>> return 0;
>>> }
>>>
>>> +#ifdef CONFIG_OF_CONTROL
>>> +unsigned int exynos_dwmmc_init(const void *blob)
>>> +{
>>> + u32 base;
>>> + int index, bus_width;
>>> + int node_list[DWMMC_MAX_CH_NUM];
>>> + int err = 0;
>>> + int dev_id, flag;
>>> + int count, i;
>>> +
>>> + count = fdtdec_find_aliases_for_id(blob, "dwmmc",
>>> + COMPAT_SAMSUNG_EXYNOS5_DWMMC, node_list,
>>> + DWMMC_MAX_CH_NUM);
>>> +
>>> + for (i = 0; i < count; i++) {
>>> + int node = node_list[i];
>>> +
>>> + if (node <= 0)
>>> + continue;
>>> +
>>> + /* Extract device id for each mmc channel */
>>> + dev_id = pinmux_decode_periph_id(blob, node);
>>> +
>>> + /* Get the bus width from the device node */
>>> + bus_width = fdtdec_get_int(blob, node,
>> "samsung,bus-width", 0);
>>> + if (bus_width < 0) {
>>> + debug("DWMMC: Can't get bus-width\n");
>>> + return -1;
>>> + }
>>> + if (8 == bus_width)
>>> + flag = PINMUX_FLAG_8BIT_MODE;
>>> + else
>>> + flag = PINMUX_FLAG_NONE;
>>> +
>>> + /* config pinmux for each mmc channel */
>>> + err = exynos_pinmux_config(dev_id, flag);
>>> + if (err) {
>>> + debug("DWMMC not configured\n");
>>> + return err;
>>> + }
>>> +
>>> + index = dev_id - PERIPH_ID_SDMMC0;
>>> +
>>> + /* Get the base address from the device node */
>>> + base = fdtdec_get_addr(blob, node, "reg");
>>> + if (!base) {
>>> + debug("DWMMC: Can't get base address\n");
>>> + return -1;
>>> + }
>>> + /* Extract the timing info from the node */
>>> + err = fdtdec_get_int_array(blob, node, "samsung,timing",
>>> + timing, 3);
>>> + if (err) {
>>> + debug("Can't get sdr-timings for divider\n");
>>> + return -1;
>>> + }
>>> + /* Initialise each mmc channel */
>>> + err = exynos_dwmci_init(base, bus_width, index);
>>> + if (err) {
>>> + debug("Can't do dwmci init\n");
>>> + return -1;
>>> + }
>>> + }
>>> +
>>> + return 0;
>>> +}
>>> +#endif
>>> diff --git a/include/dwmmc.h b/include/dwmmc.h
>>> index c8b1d40..4a42849 100644
>>> --- a/include/dwmmc.h
>>> +++ b/include/dwmmc.h
>>> @@ -123,6 +123,9 @@
>>> #define MSIZE(x) ((x) << 28)
>>> #define RX_WMARK(x) ((x) << 16)
>>> #define TX_WMARK(x) (x)
>>> +#define RX_WMARK_SHIFT 16
>>> +#define RX_WMARK_MASK (0xfff << RX_WMARK_SHIFT)
>>> +
>>>
>>> #define DWMCI_IDMAC_OWN (1 << 31)
>>> #define DWMCI_IDMAC_CH (1 << 4)
>>> @@ -144,6 +147,7 @@ struct dwmci_host {
>>> unsigned int bus_hz;
>>> int dev_index;
>>> int buswidth;
>>> + u32 clksel_val;
>>> u32 fifoth_val;
>>> struct mmc *mmc;
>>>
>>>
>>
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