[U-Boot] [PATCH v2 2/2] clk: at91: Add new clock driver
Simon Glass
sjg at chromium.org
Fri Jun 10 02:34:22 CEST 2016
+Stephen
Hi Wenyou,
On 7 June 2016 at 01:11, Wenyou Yang <wenyou.yang at atmel.com> wrote:
> The patch is referred to at91 clock driver of Linux, to make
> the clock node descriptions in dt are aligned with the Linux.
>
> Signed-off-by: Wenyou Yang <wenyou.yang at atmel.com>
> ---
>
> Changes in v2:
> - Remove the redundant log print.
>
> arch/arm/mach-at91/include/mach/at91_pmc.h | 11 ++-
> drivers/clk/Kconfig | 1 +
> drivers/clk/Makefile | 1 +
> drivers/clk/at91/Kconfig | 14 +++
> drivers/clk/at91/Makefile | 11 +++
> drivers/clk/at91/clk-generated.c | 138 +++++++++++++++++++++++++++++
> drivers/clk/at91/clk-h32mx.c | 56 ++++++++++++
> drivers/clk/at91/clk-main.c | 55 ++++++++++++
> drivers/clk/at91/clk-master.c | 33 +++++++
> drivers/clk/at91/clk-peripheral.c | 68 ++++++++++++++
> drivers/clk/at91/clk-plla.c | 55 ++++++++++++
> drivers/clk/at91/clk-slow.c | 37 ++++++++
> drivers/clk/at91/clk-system.c | 65 ++++++++++++++
> drivers/clk/at91/clk-utmi.c | 67 ++++++++++++++
> drivers/clk/at91/pmc.c | 49 ++++++++++
> drivers/clk/at91/pmc.h | 17 ++++
> drivers/clk/at91/sckc.c | 30 +++++++
> 17 files changed, 705 insertions(+), 3 deletions(-)
> create mode 100644 drivers/clk/at91/Kconfig
> create mode 100644 drivers/clk/at91/Makefile
> create mode 100644 drivers/clk/at91/clk-generated.c
> create mode 100644 drivers/clk/at91/clk-h32mx.c
> create mode 100644 drivers/clk/at91/clk-main.c
> create mode 100644 drivers/clk/at91/clk-master.c
> create mode 100644 drivers/clk/at91/clk-peripheral.c
> create mode 100644 drivers/clk/at91/clk-plla.c
> create mode 100644 drivers/clk/at91/clk-slow.c
> create mode 100644 drivers/clk/at91/clk-system.c
> create mode 100644 drivers/clk/at91/clk-utmi.c
> create mode 100644 drivers/clk/at91/pmc.c
> create mode 100644 drivers/clk/at91/pmc.h
> create mode 100644 drivers/clk/at91/sckc.c
>
> diff --git a/arch/arm/mach-at91/include/mach/at91_pmc.h b/arch/arm/mach-at91/include/mach/at91_pmc.h
> index 7684f09..d02f3e1 100644
> --- a/arch/arm/mach-at91/include/mach/at91_pmc.h
> +++ b/arch/arm/mach-at91/include/mach/at91_pmc.h
> @@ -149,6 +149,9 @@ typedef struct at91_pmc {
>
> #define AT91_PMC_PCR_PID_MASK (0x3f)
> #define AT91_PMC_PCR_GCKCSS (0x7 << 8)
> +#define AT91_PMC_PCR_GCKCSS_MASK 0x07
> +#define AT91_PMC_PCR_GCKCSS_OFFSET 8
> +#define AT91_PMC_PCR_GCKCSS_(x) ((x & 0x07) << 8)
> #define AT91_PMC_PCR_GCKCSS_SLOW_CLK (0x0 << 8)
> #define AT91_PMC_PCR_GCKCSS_MAIN_CLK (0x1 << 8)
> #define AT91_PMC_PCR_GCKCSS_PLLA_CLK (0x2 << 8)
> @@ -158,8 +161,9 @@ typedef struct at91_pmc {
> #define AT91_PMC_PCR_CMD_WRITE (0x1 << 12)
> #define AT91_PMC_PCR_DIV (0x3 << 16)
> #define AT91_PMC_PCR_GCKDIV (0xff << 20)
> -#define AT91_PMC_PCR_GCKDIV_(x) ((x & 0xff) << 20)
> -#define AT91_PMC_PCR_GCKDIV_OFFSET 20
> +#define AT91_PMC_PCR_GCKDIV_MASK 0xff
> +#define AT91_PMC_PCR_GCKDIV_OFFSET 20
> +#define AT91_PMC_PCR_GCKDIV_(x) ((x & 0xff) << 20)
> #define AT91_PMC_PCR_EN (0x1 << 28)
> #define AT91_PMC_PCR_GCKEN (0x1 << 29)
>
> @@ -243,8 +247,9 @@ typedef struct at91_pmc {
> #define AT91_PMC_PCK1RDY (1 << 9) /* Programmable Clock 1 */
> #define AT91_PMC_PCK2RDY (1 << 10) /* Programmable Clock 2 */
> #define AT91_PMC_PCK3RDY (1 << 11) /* Programmable Clock 3 */
> +#define AT91_PMC_MOSCSELS BIT(16) /* Main Oscillator Selection Status */
> +#define AT91_PMC_MOSCRCS BIT(17) /* 12 MHz RC Oscillator Status */
> #define AT91_PMC_GCKRDY (1 << 24)
> -
> #define AT91_PMC_PROTKEY 0x504d4301 /* Activation Code */
>
> /* PLL Charge Pump Current Register (PMC_PLLICPR) */
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index a98b74b..1fd1074 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -21,5 +21,6 @@ config SPL_CLK
> used as U-Boot proper.
>
> source "drivers/clk/uniphier/Kconfig"
> +source "drivers/clk/at91/Kconfig"
>
> endmenu
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index c51db15..2bb0f35 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -11,3 +11,4 @@ obj-$(CONFIG_ROCKCHIP_RK3288) += clk_rk3288.o
> obj-$(CONFIG_SANDBOX) += clk_sandbox.o
> obj-$(CONFIG_MACH_PIC32) += clk_pic32.o
> obj-$(CONFIG_CLK_UNIPHIER) += uniphier/
> +obj-$(CONFIG_CLK_AT91) += at91/
> diff --git a/drivers/clk/at91/Kconfig b/drivers/clk/at91/Kconfig
> new file mode 100644
> index 0000000..f9cb937
> --- /dev/null
> +++ b/drivers/clk/at91/Kconfig
> @@ -0,0 +1,14 @@
> +config CLK_AT91
> + bool "AT91 clock drivers"
> + depends on CLK
> + help
> + This option is used to enable the AT91 clock driver.
> +
> +config HAVE_AT91_UTMI
> + bool
> +
> +config HAVE_AT91_H32MX
> + bool
> +
> +config HAVE_AT91_GENERATED_CLK
> + bool
Please can you add help?
Also we are changing the clock interface - please see this patch:
http://patchwork.ozlabs.org/patch/625342/
I'm hoping to bring it in next week.
> diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile
> new file mode 100644
> index 0000000..eb1326b
> --- /dev/null
> +++ b/drivers/clk/at91/Makefile
> @@ -0,0 +1,11 @@
> +#
> +# Makefile for at91 specific clk
> +#
> +
> +obj-y += pmc.o sckc.o
> +obj-y += clk-slow.o clk-main.o clk-plla.o clk-master.o
> +obj-y += clk-system.o clk-peripheral.o
> +
> +obj-$(CONFIG_HAVE_AT91_UTMI) += clk-utmi.o
> +obj-$(CONFIG_HAVE_AT91_H32MX) += clk-h32mx.o
> +obj-$(CONFIG_HAVE_AT91_GENERATED_CLK) += clk-generated.o
> diff --git a/drivers/clk/at91/clk-generated.c b/drivers/clk/at91/clk-generated.c
> new file mode 100644
> index 0000000..08e7a2f
> --- /dev/null
> +++ b/drivers/clk/at91/clk-generated.c
> @@ -0,0 +1,138 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm/device.h>
> +#include <linux/io.h>
> +#include <mach/at91_pmc.h>
> +#include "pmc.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +#define GENERATED_SOURCE_MAX 6
> +#define GENERATED_MAX_DIV 255
> +
> +static ulong generated_clk_get_periph_rate(struct udevice *dev, int periph)
> +{
> + struct pmc_platdata *plat = dev_get_platdata(dev);
> + struct at91_pmc *pmc = plat->reg_base;
> + struct udevice *parent;
> + u32 tmp, gckdiv;
> + u8 parent_id;
> + int ret;
> +
> + writel(periph & AT91_PMC_PCR_PID_MASK, &pmc->pcr);
> + tmp = readl(&pmc->pcr);
> + parent_id = (tmp >> AT91_PMC_PCR_GCKCSS_OFFSET) &
> + AT91_PMC_PCR_GCKCSS_MASK;
> + gckdiv = (tmp >> AT91_PMC_PCR_GCKDIV_OFFSET) & AT91_PMC_PCR_GCKDIV_MASK;
> +
> + ret = clk_get_by_index(dev, parent_id, &parent);
> + if (ret)
> + return 0;
> +
> + return clk_get_rate(parent) / (gckdiv + 1);
> +}
> +
> +static ulong generated_clk_set_periph_rate(struct udevice *dev,
> + int periph,
> + ulong rate)
> +{
> + struct pmc_platdata *plat = dev_get_platdata(dev);
> + struct at91_pmc *pmc = plat->reg_base;
> + struct udevice *parent, *best_parent = NULL;
> + ulong tmp_rate, best_rate = rate, parent_rate;
> + int tmp_diff, best_diff = -1;
> + u8 num_parents, i;
> + u32 cells[GENERATED_SOURCE_MAX];
> + u32 div, best_div = 0;
> + u8 best_parent_id = 0;
> + u32 tmp;
> + int ret;
> +
> + num_parents = fdtdec_get_int_array_count(gd->fdt_blob, dev->of_offset,
> + "clocks", cells,
> + GENERATED_SOURCE_MAX);
Are you able to store this value in your priv data in your
of_to_platdata() method? We should not be looking at the device tree
outside that method.
> +
> + for (i = 0; i < num_parents; i++) {
> + ret = clk_get_by_index(dev, i, &parent);
> + if (ret)
> + return ret;
> +
> + parent_rate = clk_get_rate(parent);
> + if (!parent_rate)
> + return -ENODEV;
> +
> + for (div = 1; div < GENERATED_MAX_DIV + 2; div++) {
> + tmp_rate = DIV_ROUND_CLOSEST(parent_rate, div);
> + if (rate < tmp_rate)
> + continue;
> + tmp_diff = rate - tmp_rate;
> +
> + if (best_diff < 0 || best_diff > tmp_diff) {
> + best_rate = tmp_rate;
> + best_diff = tmp_diff;
> +
> + best_div = div - 1;
> + best_parent = parent;
> + best_parent_id = i;
> + }
> +
> + if (!best_diff || tmp_rate < rate)
> + break;
> + }
> +
> + if (!best_diff)
> + break;
> + }
> +
> + dev_dbg(dev, "GCK: best parent: %s, best_rate = %ld, best_div = %d\n",
> + best_parent->name, best_rate, best_div);
> +
> + ret = clk_enable(best_parent, 0);
> + if (ret)
> + return -ENODEV;
> +
> + writel(periph & AT91_PMC_PCR_PID_MASK, &pmc->pcr);
> + tmp = readl(&pmc->pcr);
> + tmp &= ~(AT91_PMC_PCR_GCKDIV | AT91_PMC_PCR_GCKCSS);
> + tmp |= AT91_PMC_PCR_GCKCSS_(best_parent_id) |
> + AT91_PMC_PCR_CMD_WRITE |
> + AT91_PMC_PCR_GCKDIV_(best_div) |
> + AT91_PMC_PCR_GCKEN;
> + writel(tmp, &pmc->pcr);
> +
> + while (!(readl(&pmc->sr) & AT91_PMC_GCKRDY))
> + ;
> +
> + return 0;
> +}
> +
> +static struct clk_ops generated_clk_ops = {
> + .get_periph_rate = generated_clk_get_periph_rate,
> + .set_periph_rate = generated_clk_set_periph_rate,
> +};
> +
> +static int generated_clk_probe(struct udevice *dev)
> +{
> + return at91_pmc_core_probe(dev);
> +}
> +
> +static const struct udevice_id generated_clk_match[] = {
> + { .compatible = "atmel,sama5d2-clk-generated" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(generated_clk) = {
> + .name = "generated-clk",
> + .id = UCLASS_CLK,
> + .of_match = generated_clk_match,
> + .probe = generated_clk_probe,
> + .platdata_auto_alloc_size = sizeof(struct pmc_platdata),
> + .ops = &generated_clk_ops,
> +};
> diff --git a/drivers/clk/at91/clk-h32mx.c b/drivers/clk/at91/clk-h32mx.c
> new file mode 100644
> index 0000000..035562a
> --- /dev/null
> +++ b/drivers/clk/at91/clk-h32mx.c
> @@ -0,0 +1,56 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm/device.h>
> +#include <dm/util.h>
> +#include <linux/io.h>
> +#include <mach/at91_pmc.h>
> +#include "pmc.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +#define H32MX_MAX_FREQ 90000000
> +
> +static ulong sama5d4_h32mx_clk_get_rate(struct udevice *dev)
> +{
> + struct pmc_platdata *plat = dev_get_platdata(dev);
> + struct at91_pmc *pmc = plat->reg_base;
> + ulong rate = gd->arch.mck_rate_hz;
> +
> + if (readl(&pmc->mckr) & AT91_PMC_MCKR_H32MXDIV)
> + rate /= 2;
> +
> + if (rate > H32MX_MAX_FREQ)
> + dm_warn("H32MX clock is too fast\n");
> +
> + return rate;
> +}
> +
> +static struct clk_ops sama5d4_h32mx_clk_ops = {
> + .get_rate = sama5d4_h32mx_clk_get_rate,
> +};
> +
> +static int sama5d4_h32mx_clk_probe(struct udevice *dev)
> +{
> + return at91_pmc_core_probe(dev);
> +}
> +
> +static const struct udevice_id sama5d4_h32mx_clk_match[] = {
> + { .compatible = "atmel,sama5d4-clk-h32mx" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(sama5d4_h32mx_clk) = {
> + .name = "sama5d4-h32mx-clk",
> + .id = UCLASS_CLK,
> + .of_match = sama5d4_h32mx_clk_match,
> + .probe = sama5d4_h32mx_clk_probe,
> + .platdata_auto_alloc_size = sizeof(struct pmc_platdata),
> + .ops = &sama5d4_h32mx_clk_ops,
> +};
> diff --git a/drivers/clk/at91/clk-main.c b/drivers/clk/at91/clk-main.c
> new file mode 100644
> index 0000000..10ab951
> --- /dev/null
> +++ b/drivers/clk/at91/clk-main.c
> @@ -0,0 +1,55 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm/device.h>
> +#include <linux/io.h>
> +#include <mach/at91_pmc.h>
> +#include "pmc.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +static int main_osc_clk_enable(struct udevice *dev, int periph)
> +{
> + struct pmc_platdata *plat = dev_get_platdata(dev);
> + struct at91_pmc *pmc = plat->reg_base;
> +
> + if (readl(&pmc->sr) & AT91_PMC_MOSCSELS)
> + return 0;
> +
> + return -ENODEV;
This error indicates that there is no device. But it looks like there
is. What are you trying to represent here?
> +}
> +
> +static ulong main_osc_clk_get_rate(struct udevice *dev)
> +{
> + return gd->arch.main_clk_rate_hz;
> +}
> +
> +static struct clk_ops main_osc_clk_ops = {
> + .enable = main_osc_clk_enable,
> + .get_rate = main_osc_clk_get_rate,
> +};
> +
> +static int main_osc_clk_probe(struct udevice *dev)
> +{
> + return at91_pmc_core_probe(dev);
> +}
> +
> +static const struct udevice_id main_osc_clk_match[] = {
> + { .compatible = "atmel,at91sam9x5-clk-main" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(at91sam9x5_main_osc_clk) = {
> + .name = "at91sam9x5-main-osc-clk",
> + .id = UCLASS_CLK,
> + .of_match = main_osc_clk_match,
> + .probe = main_osc_clk_probe,
> + .platdata_auto_alloc_size = sizeof(struct pmc_platdata),
> + .ops = &main_osc_clk_ops,
> +};
> diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c
> new file mode 100644
> index 0000000..6d844d0
> --- /dev/null
> +++ b/drivers/clk/at91/clk-master.c
> @@ -0,0 +1,33 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm/device.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +static ulong at91_master_clk_get_rate(struct udevice *dev)
> +{
> + return gd->arch.mck_rate_hz;
> +}
> +
> +static struct clk_ops at91_master_clk_ops = {
> + .get_rate = at91_master_clk_get_rate,
> +};
> +
> +static const struct udevice_id at91_master_clk_match[] = {
> + { .compatible = "atmel,at91sam9x5-clk-master" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(at91_master_clk) = {
> + .name = "at91-master-clk",
> + .id = UCLASS_CLK,
> + .of_match = at91_master_clk_match,
> + .ops = &at91_master_clk_ops,
> +};
> diff --git a/drivers/clk/at91/clk-peripheral.c b/drivers/clk/at91/clk-peripheral.c
> new file mode 100644
> index 0000000..4faeca5
> --- /dev/null
> +++ b/drivers/clk/at91/clk-peripheral.c
> @@ -0,0 +1,68 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm/device.h>
> +#include <linux/io.h>
> +#include <mach/at91_pmc.h>
> +#include "pmc.h"
> +
> +#define PERIPHERAL_MAX 64
> +
> +#define PERIPHERAL_AT91RM9200 0
> +#define PERIPHERAL_AT91SAM9X5 1
> +
> +#define PERIPHERAL_ID_MIN 2
> +#define PERIPHERAL_ID_MAX 31
> +#define PERIPHERAL_MASK(id) (1 << ((id) & PERIPHERAL_ID_MAX))
> +
> +#define PERIPHERAL_RSHIFT_MASK 0x3
> +#define PERIPHERAL_RSHIFT(val) (((val) >> 16) & PERIPHERAL_RSHIFT_MASK)
> +
> +#define PERIPHERAL_MAX_SHIFT 3
> +
> +static int sam9x5_periph_clk_enable(struct udevice *dev, int periph)
> +{
> + struct pmc_platdata *plat = dev_get_platdata(dev);
> + struct at91_pmc *pmc = plat->reg_base;
> + u32 tmp;
> +
> + if (periph < PERIPHERAL_ID_MIN)
> + return -1;
> +
> + writel(periph & AT91_PMC_PCR_PID_MASK, &pmc->pcr);
> + tmp = readl(&pmc->pcr);
> + writel(tmp |
> + AT91_PMC_PCR_CMD_WRITE |
> + AT91_PMC_PCR_EN, &pmc->pcr);
Or use setbits_le32(&pmc->pcr, AT91_PMC_PCR_CMD_WRITE | AT91_PMC_PCR_EN)
> +
> + return 0;
> +}
> +
> +static struct clk_ops sam9x5_periph_clk_ops = {
> + .enable = sam9x5_periph_clk_enable,
> +};
> +
> +static int sam9x5_periph_clk_probe(struct udevice *dev)
> +{
> + return at91_pmc_core_probe(dev);
> +}
> +
> +static const struct udevice_id sam9x5_periph_clk_match[] = {
> + { .compatible = "atmel,at91sam9x5-clk-peripheral" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(sam9x5_periph_clk) = {
> + .name = "sam9x5-periph-clk",
> + .id = UCLASS_CLK,
> + .of_match = sam9x5_periph_clk_match,
> + .probe = sam9x5_periph_clk_probe,
> + .platdata_auto_alloc_size = sizeof(struct pmc_platdata),
> + .ops = &sam9x5_periph_clk_ops,
> +};
> diff --git a/drivers/clk/at91/clk-plla.c b/drivers/clk/at91/clk-plla.c
> new file mode 100644
> index 0000000..3a2168e
> --- /dev/null
> +++ b/drivers/clk/at91/clk-plla.c
> @@ -0,0 +1,55 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm/device.h>
> +#include <linux/io.h>
> +#include <mach/at91_pmc.h>
> +#include "pmc.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +static int plla_clk_enable(struct udevice *dev, int periph)
> +{
> + struct pmc_platdata *plat = dev_get_platdata(dev);
> + struct at91_pmc *pmc = plat->reg_base;
> +
> + if (readl(&pmc->sr) & AT91_PMC_LOCKA)
> + return 0;
> +
> + return -ENODEV;
Same error question here.
> +}
> +
> +static ulong plla_clk_get_rate(struct udevice *dev)
> +{
> + return gd->arch.plla_rate_hz;
> +}
> +
> +static struct clk_ops plla_clk_ops = {
> + .enable = plla_clk_enable,
> + .get_rate = plla_clk_get_rate,
> +};
> +
> +static int plla_clk_probe(struct udevice *dev)
> +{
> + return at91_pmc_core_probe(dev);
> +}
> +
> +static const struct udevice_id plla_clk_match[] = {
> + { .compatible = "atmel,sama5d3-clk-pll" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(at91_plla_clk) = {
> + .name = "at91-plla-clk",
> + .id = UCLASS_CLK,
> + .of_match = plla_clk_match,
> + .probe = plla_clk_probe,
> + .platdata_auto_alloc_size = sizeof(struct pmc_platdata),
> + .ops = &plla_clk_ops,
> +};
> diff --git a/drivers/clk/at91/clk-slow.c b/drivers/clk/at91/clk-slow.c
> new file mode 100644
> index 0000000..f73a553
> --- /dev/null
> +++ b/drivers/clk/at91/clk-slow.c
> @@ -0,0 +1,37 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm/device.h>
> +
> +static int at91_slow_clk_enable(struct udevice *dev, int periph)
> +{
> + return 0;
> +}
> +
> +static ulong at91_slow_clk_get_rate(struct udevice *dev)
> +{
> + return CONFIG_SYS_AT91_SLOW_CLOCK;
> +}
> +
> +static struct clk_ops at91_slow_clk_ops = {
> + .enable = at91_slow_clk_enable,
> + .get_rate = at91_slow_clk_get_rate,
> +};
> +
> +static const struct udevice_id at91_slow_clk_match[] = {
> + { .compatible = "atmel,at91sam9x5-clk-slow" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(at91_slow_clk) = {
> + .name = "at91-slow-clk",
> + .id = UCLASS_CLK,
> + .of_match = at91_slow_clk_match,
> + .ops = &at91_slow_clk_ops,
> +};
> diff --git a/drivers/clk/at91/clk-system.c b/drivers/clk/at91/clk-system.c
> new file mode 100644
> index 0000000..5e50af6
> --- /dev/null
> +++ b/drivers/clk/at91/clk-system.c
> @@ -0,0 +1,65 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm/device.h>
> +#include <linux/io.h>
> +#include <mach/at91_pmc.h>
> +#include "pmc.h"
> +
> +#define SYSTEM_MAX_ID 31
> +
> +static inline int is_pck(int id)
> +{
> + return (id >= 8) && (id <= 15);
> +}
> +
> +static int at91_system_clk_enable(struct udevice *dev, int id)
> +{
> + struct pmc_platdata *plat = dev_get_platdata(dev);
> + struct at91_pmc *pmc = plat->reg_base;
> + u32 mask;
> +
> + if (id > SYSTEM_MAX_ID)
> + return -EINVAL;
> +
> + mask = BIT(id);
> +
> + writel(mask, &pmc->scer);
> +
> + if (!is_pck(id))
> + return 0;
Please can you add a comment to explain the above two lines?
> +
> + while (!(readl(&pmc->sr) & mask))
> + ;
> +
> + return 0;
> +}
> +
> +static struct clk_ops at91_system_clk_ops = {
> + .enable = at91_system_clk_enable,
> +};
> +
> +static int at91_system_clk_probe(struct udevice *dev)
> +{
> + return at91_pmc_core_probe(dev);
> +}
> +
> +static const struct udevice_id at91_system_clk_match[] = {
> + { .compatible = "atmel,at91rm9200-clk-system" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(at91_system_clk) = {
> + .name = "at91-system-clk",
> + .id = UCLASS_CLK,
> + .of_match = at91_system_clk_match,
> + .probe = at91_system_clk_probe,
> + .platdata_auto_alloc_size = sizeof(struct pmc_platdata),
> + .ops = &at91_system_clk_ops,
> +};
> diff --git a/drivers/clk/at91/clk-utmi.c b/drivers/clk/at91/clk-utmi.c
> new file mode 100644
> index 0000000..835c611
> --- /dev/null
> +++ b/drivers/clk/at91/clk-utmi.c
> @@ -0,0 +1,67 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm/device.h>
> +#include <linux/io.h>
> +#include <mach/at91_pmc.h>
> +#include "pmc.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +#define UTMI_FIXED_MUL 40
> +
> +static int utmi_clk_enable(struct udevice *dev, int periph)
> +{
> + struct pmc_platdata *plat = dev_get_platdata(dev);
> + struct at91_pmc *pmc = plat->reg_base;
> + u32 tmp;
> +
> + if (readl(&pmc->sr) & AT91_PMC_LOCKU)
> + return 0;
> +
> + tmp = readl(&pmc->uckr);
> + tmp |= AT91_PMC_UPLLEN |
> + AT91_PMC_UPLLCOUNT |
> + AT91_PMC_BIASEN;
> + writel(tmp, &pmc->uckr);
> +
> + while (!(readl(&pmc->sr) & AT91_PMC_LOCKU))
> + ;
> +
> + return 0;
> +}
> +
> +static ulong utmi_clk_get_rate(struct udevice *dev)
> +{
> + return gd->arch.main_clk_rate_hz * UTMI_FIXED_MUL;
> +}
> +
> +static struct clk_ops utmi_clk_ops = {
> + .enable = utmi_clk_enable,
> + .get_rate = utmi_clk_get_rate,
> +};
> +
> +static int utmi_clk_probe(struct udevice *dev)
> +{
> + return at91_pmc_core_probe(dev);
> +}
> +
> +static const struct udevice_id utmi_clk_match[] = {
> + { .compatible = "atmel,at91sam9x5-clk-utmi" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(at91sam9x5_utmi_clk) = {
> + .name = "at91sam9x5-utmi-clk",
> + .id = UCLASS_CLK,
> + .of_match = utmi_clk_match,
> + .probe = utmi_clk_probe,
> + .platdata_auto_alloc_size = sizeof(struct pmc_platdata),
> + .ops = &utmi_clk_ops,
> +};
> diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
> new file mode 100644
> index 0000000..de802e8
> --- /dev/null
> +++ b/drivers/clk/at91/pmc.c
> @@ -0,0 +1,49 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm/device.h>
> +#include <dm/root.h>
> +#include "pmc.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +static int at91_pmc_core_bind(struct udevice *dev)
> +{
> + return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
> +}
> +
> +static const struct udevice_id at91_pmc_core_match[] = {
> + { .compatible = "atmel,sama5d2-pmc" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(at91_pmc_core) = {
> + .name = "at91_pmc_core",
> + .id = UCLASS_CLK,
> + .of_match = at91_pmc_core_match,
> + .bind = at91_pmc_core_bind,
> +};
> +
> +int at91_pmc_core_probe(struct udevice *dev)
> +{
> + struct pmc_platdata *plat = dev_get_platdata(dev);
> + fdt_addr_t addr;
> +
> + dev = dev_get_parent(dev);
> + if (!dev)
> + return -EINVAL;
There will always be a parent, so this test is redundant.
> +
> + addr = dev_get_addr(dev);
> + if (addr == FDT_ADDR_T_NONE)
> + return -EINVAL;
You can use dev_get_addr_ptr() here.
> +
> + plat->reg_base = (struct at91_pmc *)addr;
> +
> + return 0;
> +}
> diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
> new file mode 100644
> index 0000000..201dad8
> --- /dev/null
> +++ b/drivers/clk/at91/pmc.h
> @@ -0,0 +1,17 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#ifndef __AT91_PMC_H__
> +#define __AT91_PMC_H__
> +
> +struct pmc_platdata {
> + struct at91_pmc *reg_base;
> +};
> +
> +int at91_pmc_core_probe(struct udevice *dev);
> +
> +#endif
> diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
> new file mode 100644
> index 0000000..69ec636
> --- /dev/null
> +++ b/drivers/clk/at91/sckc.c
> @@ -0,0 +1,30 @@
> +/*
> + * Copyright (C) 2016 Atmel Corporation
> + * Wenyou.Yang <wenyou.yang at atmel.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm/device.h>
> +#include <dm/root.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +static int at91_sckc_clk_bind(struct udevice *dev)
> +{
> + return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
> +}
> +
> +static const struct udevice_id at91_sckc_clk_match[] = {
> + { .compatible = "atmel,at91sam9x5-sckc" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(at91_sckc_clk) = {
> + .name = "at91_sckc_clk",
> + .id = UCLASS_CLK,
> + .of_match = at91_sckc_clk_match,
> + .bind = at91_sckc_clk_bind,
> +};
> --
> 2.7.4
>
Regards,
Simon
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