[U-Boot] [PATCH V5 04/10] EXYNOS5: DWMMC: Added FDT support for DWMMC
Amarendra Reddy
amar.lavanuru at gmail.com
Mon Jan 28 10:31:56 CET 2013
Hi Simon,
Please find the responses below.
Thanks & Regards
Amarendra
On 27 January 2013 01:38, Simon Glass <sjg at chromium.org> wrote:
> Hi,
>
> On Tue, Jan 22, 2013 at 12:43 AM, Amar <amarendra.xt at samsung.com> wrote:
> > This patch adds FDT support for DWMMC, by reading the DWMMC node data
> > from the device tree and initialising DWMMC channels as per data
> > obtained from the node.
> >
> > Signed-off-by: Vivek Gautam <gautam.vivek at samsung.com>
> > Signed-off-by: Amar <amarendra.xt at samsung.com>
>
> Acked-by: Simon Glass <sjg at chromium.org>
>
> See below for nit/question.
>
> > ---
> > Changes since V1:
> > 1)Updated code to have same signature for the function
> > exynos_dwmci_init() for both FDT and non-FDT versions.
> > 2)Updated code to pass device_id parameter to the function
> > exynos5_mmc_set_clk_div() instead of index.
> > 3)Updated code to decode the value of "samsung,width" from FDT.
> > 4)Channel index is computed instead of getting from FDT.
> >
> > Changes since V2:
> > 1)Updation of commit message and resubmition of proper patch set.
> >
> > Changes since V3:
> > 1)Replaced the new function exynos5_mmc_set_clk_div() with the
> > existing function set_mmc_clk(). set_mmc_clk() will do the
> purpose.
> > 2)Computation of FSYS block clock divisor (pre-ratio) is added.
> >
> > Changes since V4:
> > 1)Replaced "unsigned int exynos_dwmmc_init(int index, int
> bus_width)" with
> > int exynos_dwmci_add_port(int, u32, inth, u32)
> > i)exynos_dwmmc_add_port() will be used by non-FDT boards.
> > ii)In FDT case, exynos_dwmmc_init(const void *blob) will
> use
> > exynos_dwmmc_add_port() for every channel enabled in
> device node.
> > 2)Changed the computation method of mmc clock divisor.
> > 3)Updated exynos_dwmmc_init() to compute the 'clksel_val' within
> the function.
> >
> > arch/arm/include/asm/arch-exynos/dwmmc.h | 11 +--
> > drivers/mmc/exynos_dw_mmc.c | 127
> ++++++++++++++++++++++++++++---
> > include/dwmmc.h | 3 +
> > 3 files changed, 124 insertions(+), 17 deletions(-)
> >
> > diff --git a/arch/arm/include/asm/arch-exynos/dwmmc.h
> b/arch/arm/include/asm/arch-exynos/dwmmc.h
> > index 8acdf9b..3b147b8 100644
> > --- a/arch/arm/include/asm/arch-exynos/dwmmc.h
> > +++ b/arch/arm/include/asm/arch-exynos/dwmmc.h
> > @@ -27,10 +27,7 @@
> > #define DWMCI_SET_DRV_CLK(x) ((x) << 16)
> > #define DWMCI_SET_DIV_RATIO(x) ((x) << 24)
> >
> > -int exynos_dwmci_init(u32 regbase, int bus_width, int index);
> > -
> > -static inline unsigned int exynos_dwmmc_init(int index, int bus_width)
> > -{
> > - unsigned int base = samsung_get_base_mmc() + (0x10000 * index);
> > - return exynos_dwmci_init(base, bus_width, index);
> > -}
> > +#ifdef CONFIG_OF_CONTROL
> > +int exynos_dwmmc_init(const void *blob);
> > +#endif
> > +int exynos_dwmci_add_port(int index, u32 regbase, int bus_width, u32
> clksel);
> > diff --git a/drivers/mmc/exynos_dw_mmc.c b/drivers/mmc/exynos_dw_mmc.c
> > index 72a31b7..1d09e56 100644
> > --- a/drivers/mmc/exynos_dw_mmc.c
> > +++ b/drivers/mmc/exynos_dw_mmc.c
> > @@ -19,39 +19,146 @@
> > */
> >
> > #include <common.h>
> > -#include <malloc.h>
> > #include <dwmmc.h>
> > +#include <fdtdec.h>
> > +#include <libfdt.h>
> > +#include <malloc.h>
> > #include <asm/arch/dwmmc.h>
> > #include <asm/arch/clk.h>
> > +#include <asm/arch/pinmux.h>
> >
> > -static char *EXYNOS_NAME = "EXYNOS DWMMC";
> > +#define DWMMC_MAX_CH_NUM 4
> > +#define DWMMC_MAX_FREQ 52000000
> > +#define DWMMC_MIN_FREQ 400000
> > +#define DWMMC_MMC0_CLKSEL_VAL 0x03030001
> > +#define DWMMC_MMC2_CLKSEL_VAL 0x03020001
> >
> > +/*
> > + * Function used as callback function to initialise the
> > + * CLKSEL register for every mmc channel.
> > + */
> > static void exynos_dwmci_clksel(struct dwmci_host *host)
> > {
> > - u32 val;
> > - val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) |
> > - DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) |
> DWMCI_SET_DIV_RATIO(0);
> > + dwmci_writel(host, DWMCI_CLKSEL, host->clksel_val);
> > +}
> >
> > - dwmci_writel(host, DWMCI_CLKSEL, val);
> > +unsigned int exynos_dwmci_get_clk(int dev_index)
> > +{
> > + return get_mmc_clk(dev_index);
> > }
> >
> > -int exynos_dwmci_init(u32 regbase, int bus_width, int index)
> > +/*
> > + * This function adds the mmc channel to be registered with mmc core.
> > + * index - mmc channel number.
> > + * regbase - register base address of mmc channel specified in
> 'index'.
> > + * bus_width - operating bus width of mmc channel specified in 'index'.
> > + * clksel - value to be written into CLKSEL register in case of FDT.
> > + * NULL in case od non-FDT.
> > + */
> > +int exynos_dwmci_add_port(int index, u32 regbase, int bus_width, u32
> clksel)
> > {
> > struct dwmci_host *host = NULL;
> > + unsigned int div;
> > + unsigned long freq, sclk;
> > host = malloc(sizeof(struct dwmci_host));
> > if (!host) {
> > printf("dwmci_host malloc fail!\n");
> > return 1;
> > }
> > + /* request mmc clock vlaue of 50MHz. */
> > + freq = 50000000;
>
> Should this be 52MHz?
>
Ok shall change it to 52MHz.
>
> > + sclk = get_mmc_clk(index);
> > + div = DIV_ROUND_UP(sclk, freq);
> > + /* set the clock divisor for mmc */
> > + set_mmc_clk(index, div);
> >
> > - host->name = EXYNOS_NAME;
> > + host->name = "EXYNOS DWMMC";
> > host->ioaddr = (void *)regbase;
> > host->buswidth = bus_width;
> > +
> > + if (clksel)
>
> {} around if() part since you have it for else.
>
>
Ok will put {} around if() part.
> > + host->clksel_val = clksel;
> > + else {
> > + if (0 == index)
> > + host->clksel_val = DWMMC_MMC0_CLKSEL_VAL;
> > + if (2 == index)
> > + host->clksel_val = DWMMC_MMC2_CLKSEL_VAL;
> > + }
> > +
> > host->clksel = exynos_dwmci_clksel;
> > host->dev_index = index;
> > + host->mmc_clk = exynos_dwmci_get_clk;
> > + /* Add the mmc channel to be registered with mmc core */
> > + if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
> > + printf("dwmmc%d registration failed\n", index);
>
> Should this be debug()?
>
I think it should be printf(), because if the mmc channel registration
fails, then this failure information needs to be conveyed to the user.
This will happen if printf() is used.
If debug() is used, then the statement will be printed only when the DEBUG
is defined.
> + return -1;
> + }
> + return 0;
> +}
> +
> +#ifdef CONFIG_OF_CONTROL
> +int exynos_dwmmc_init(const void *blob)
> +{
> + int index, bus_width;
> + int node_list[DWMMC_MAX_CH_NUM];
> + int err = 0, dev_id, flag, count, i;
> + u32 clksel_val, base, timing[3];
> +
> + count = fdtdec_find_aliases_for_id(blob, "mmc",
> + 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;
>
> - add_dwmci(host, 52000000, 400000);
> + /* 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;
> + }
> +
> + clksel_val = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
> + DWMCI_SET_DRV_CLK(timing[1]) |
> + DWMCI_SET_DIV_RATIO(timing[2]));
> + /* Initialise each mmc channel */
> + err = exynos_dwmci_add_port(index, base, bus_width,
clksel_val);
> + if (err)
> + debug("dwmmc Channel-%d init failed\n", index);
> + }
> return 0;
> }
> -
> +#endif
> diff --git a/include/dwmmc.h b/include/dwmmc.h
> index c8b1d40..e142f3e 100644
> --- a/include/dwmmc.h
> +++ b/include/dwmmc.h
> @@ -123,6 +123,8 @@
> #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 +146,7 @@ struct dwmci_host {
> unsigned int bus_hz;
> int dev_index;
> int buswidth;
> + u32 clksel_val;
> u32 fifoth_val;
> struct mmc *mmc;
>
> --
> 1.8.0
>
Regards,
> Simon
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