4 files changed, 423 insertions, 0 deletions

diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile
index a82488323ea4..61db058be0c0 100644
--- a/drivers/clk/at91/Makefile
+++ b/drivers/clk/at91/Makefile
@@ -8,3 +8,4 @@ obj-y += clk-system.o clk-peripheral.o
 
 obj-$(CONFIG_AT91_PROGRAMMABLE_CLOCKS)  += clk-programmable.o
 obj-$(CONFIG_HAVE_AT91_UTMI)            += clk-utmi.o
+obj-$(CONFIG_HAVE_AT91_USB_CLK)         += clk-usb.o
diff --git a/drivers/clk/at91/clk-usb.c b/drivers/clk/at91/clk-usb.c
new file mode 100644
index 000000000000..7d1d26a4bd04
--- /dev/null
+++ b/drivers/clk/at91/clk-usb.c
@@ -0,0 +1,398 @@
+/*
+ *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/clk/at91_pmc.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+
+#include "pmc.h"
+
+#define USB_SOURCE_MAX          2
+
+#define SAM9X5_USB_DIV_SHIFT    8
+#define SAM9X5_USB_MAX_DIV      0xf
+
+#define RM9200_USB_DIV_SHIFT    28
+#define RM9200_USB_DIV_TAB_SIZE 4
+
+struct at91sam9x5_clk_usb {
+        struct clk_hw hw;
+        struct at91_pmc *pmc;
+};
+
+#define to_at91sam9x5_clk_usb(hw) \
+        container_of(hw, struct at91sam9x5_clk_usb, hw)
+
+struct at91rm9200_clk_usb {
+        struct clk_hw hw;
+        struct at91_pmc *pmc;
+        u32 divisors[4];
+};
+
+#define to_at91rm9200_clk_usb(hw) \
+        container_of(hw, struct at91rm9200_clk_usb, hw)
+
+static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw,
+                                                    unsigned long parent_rate)
+{
+        u32 tmp;
+        u8 usbdiv;
+        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
+        struct at91_pmc *pmc = usb->pmc;
+
+        tmp = pmc_read(pmc, AT91_PMC_USB);
+        usbdiv = (tmp & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;
+        return parent_rate / (usbdiv + 1);
+}
+
+static long at91sam9x5_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
+                                          unsigned long *parent_rate)
+{
+        unsigned long div;
+        unsigned long bestrate;
+        unsigned long tmp;
+
+        if (rate >= *parent_rate)
+                return *parent_rate;
+
+        div = *parent_rate / rate;
+        if (div >= SAM9X5_USB_MAX_DIV)
+                return *parent_rate / (SAM9X5_USB_MAX_DIV + 1);
+
+        bestrate = *parent_rate / div;
+        tmp = *parent_rate / (div + 1);
+        if (bestrate - rate > rate - tmp)
+                bestrate = tmp;
+
+        return bestrate;
+}
+
+static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
+{
+        u32 tmp;
+        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
+        struct at91_pmc *pmc = usb->pmc;
+
+        if (index > 1)
+                return -EINVAL;
+        tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS;
+        if (index)
+                tmp |= AT91_PMC_USBS;
+        pmc_write(pmc, AT91_PMC_USB, tmp);
+        return 0;
+}
+
+static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
+{
+        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
+        struct at91_pmc *pmc = usb->pmc;
+
+        return pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS;
+}
+
+static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
+                                       unsigned long parent_rate)
+{
+        u32 tmp;
+        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
+        struct at91_pmc *pmc = usb->pmc;
+        unsigned long div = parent_rate / rate;
+
+        if (parent_rate % rate || div < 1 || div >= SAM9X5_USB_MAX_DIV)
+                return -EINVAL;
+
+        tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV;
+        tmp |= (div - 1) << SAM9X5_USB_DIV_SHIFT;
+        pmc_write(pmc, AT91_PMC_USB, tmp);
+
+        return 0;
+}
+
+static const struct clk_ops at91sam9x5_usb_ops = {
+        .recalc_rate = at91sam9x5_clk_usb_recalc_rate,
+        .round_rate = at91sam9x5_clk_usb_round_rate,
+        .get_parent = at91sam9x5_clk_usb_get_parent,
+        .set_parent = at91sam9x5_clk_usb_set_parent,
+        .set_rate = at91sam9x5_clk_usb_set_rate,
+};
+
+static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)
+{
+        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
+        struct at91_pmc *pmc = usb->pmc;
+
+        pmc_write(pmc, AT91_PMC_USB,
+                  pmc_read(pmc, AT91_PMC_USB) | AT91_PMC_USBS);
+        return 0;
+}
+
+static void at91sam9n12_clk_usb_disable(struct clk_hw *hw)
+{
+        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
+        struct at91_pmc *pmc = usb->pmc;
+
+        pmc_write(pmc, AT91_PMC_USB,
+                  pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS);
+}
+
+static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
+{
+        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
+        struct at91_pmc *pmc = usb->pmc;
+
+        return !!(pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS);
+}
+
+static const struct clk_ops at91sam9n12_usb_ops = {
+        .enable = at91sam9n12_clk_usb_enable,
+        .disable = at91sam9n12_clk_usb_disable,
+        .is_enabled = at91sam9n12_clk_usb_is_enabled,
+        .recalc_rate = at91sam9x5_clk_usb_recalc_rate,
+        .round_rate = at91sam9x5_clk_usb_round_rate,
+        .set_rate = at91sam9x5_clk_usb_set_rate,
+};
+
+static struct clk * __init
+at91sam9x5_clk_register_usb(struct at91_pmc *pmc, const char *name,
+                            const char **parent_names, u8 num_parents)
+{
+        struct at91sam9x5_clk_usb *usb;
+        struct clk *clk = NULL;
+        struct clk_init_data init;
+
+        usb = kzalloc(sizeof(*usb), GFP_KERNEL);
+        if (!usb)
+                return ERR_PTR(-ENOMEM);
+
+        init.name = name;
+        init.ops = &at91sam9x5_usb_ops;
+        init.parent_names = parent_names;
+        init.num_parents = num_parents;
+        init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
+
+        usb->hw.init = &init;
+        usb->pmc = pmc;
+
+        clk = clk_register(NULL, &usb->hw);
+        if (IS_ERR(clk))
+                kfree(usb);
+
+        return clk;
+}
+
+static struct clk * __init
+at91sam9n12_clk_register_usb(struct at91_pmc *pmc, const char *name,
+                             const char *parent_name)
+{
+        struct at91sam9x5_clk_usb *usb;
+        struct clk *clk = NULL;
+        struct clk_init_data init;
+
+        usb = kzalloc(sizeof(*usb), GFP_KERNEL);
+        if (!usb)
+                return ERR_PTR(-ENOMEM);
+
+        init.name = name;
+        init.ops = &at91sam9n12_usb_ops;
+        init.parent_names = &parent_name;
+        init.num_parents = 1;
+        init.flags = CLK_SET_RATE_GATE;
+
+        usb->hw.init = &init;
+        usb->pmc = pmc;
+
+        clk = clk_register(NULL, &usb->hw);
+        if (IS_ERR(clk))
+                kfree(usb);
+
+        return clk;
+}
+
+static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
+                                                    unsigned long parent_rate)
+{
+        struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
+        struct at91_pmc *pmc = usb->pmc;
+        u32 tmp;
+        u8 usbdiv;
+
+        tmp = pmc_read(pmc, AT91_CKGR_PLLBR);
+        usbdiv = (tmp & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
+        if (usb->divisors[usbdiv])
+                return parent_rate / usb->divisors[usbdiv];
+
+        return 0;
+}
+
+static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
+                                          unsigned long *parent_rate)
+{
+        struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
+        unsigned long bestrate = 0;
+        int bestdiff = -1;
+        unsigned long tmprate;
+        int tmpdiff;
+        int i = 0;
+
+        for (i = 0; i < 4; i++) {
+                if (!usb->divisors[i])
+                        continue;
+                tmprate = *parent_rate / usb->divisors[i];
+                if (tmprate < rate)
+                        tmpdiff = rate - tmprate;
+                else
+                        tmpdiff = tmprate - rate;
+
+                if (bestdiff < 0 || bestdiff > tmpdiff) {
+                        bestrate = tmprate;
+                        bestdiff = tmpdiff;
+                }
+
+                if (!bestdiff)
+                        break;
+        }
+
+        return bestrate;
+}
+
+static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
+                                       unsigned long parent_rate)
+{
+        u32 tmp;
+        int i;
+        struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
+        struct at91_pmc *pmc = usb->pmc;
+        unsigned long div = parent_rate / rate;
+
+        if (parent_rate % rate)
+                return -EINVAL;
+        for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
+                if (usb->divisors[i] == div) {
+                        tmp = pmc_read(pmc, AT91_CKGR_PLLBR) &
+                              ~AT91_PMC_USBDIV;
+                        tmp |= i << RM9200_USB_DIV_SHIFT;
+                        pmc_write(pmc, AT91_CKGR_PLLBR, tmp);
+                        return 0;
+                }
+        }
+
+        return -EINVAL;
+}
+
+static const struct clk_ops at91rm9200_usb_ops = {
+        .recalc_rate = at91rm9200_clk_usb_recalc_rate,
+        .round_rate = at91rm9200_clk_usb_round_rate,
+        .set_rate = at91rm9200_clk_usb_set_rate,
+};
+
+static struct clk * __init
+at91rm9200_clk_register_usb(struct at91_pmc *pmc, const char *name,
+                            const char *parent_name, const u32 *divisors)
+{
+        struct at91rm9200_clk_usb *usb;
+        struct clk *clk = NULL;
+        struct clk_init_data init;
+
+        usb = kzalloc(sizeof(*usb), GFP_KERNEL);
+        if (!usb)
+                return ERR_PTR(-ENOMEM);
+
+        init.name = name;
+        init.ops = &at91rm9200_usb_ops;
+        init.parent_names = &parent_name;
+        init.num_parents = 1;
+        init.flags = 0;
+
+        usb->hw.init = &init;
+        usb->pmc = pmc;
+        memcpy(usb->divisors, divisors, sizeof(usb->divisors));
+
+        clk = clk_register(NULL, &usb->hw);
+        if (IS_ERR(clk))
+                kfree(usb);
+
+        return clk;
+}
+
+void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
+                                        struct at91_pmc *pmc)
+{
+        struct clk *clk;
+        int i;
+        int num_parents;
+        const char *parent_names[USB_SOURCE_MAX];
+        const char *name = np->name;
+
+        num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");
+        if (num_parents <= 0 || num_parents > USB_SOURCE_MAX)
+                return;
+
+        for (i = 0; i < num_parents; i++) {
+                parent_names[i] = of_clk_get_parent_name(np, i);
+                if (!parent_names[i])
+                        return;
+        }
+
+        of_property_read_string(np, "clock-output-names", &name);
+
+        clk = at91sam9x5_clk_register_usb(pmc, name, parent_names, num_parents);
+        if (IS_ERR(clk))
+                return;
+
+        of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,
+                                         struct at91_pmc *pmc)
+{
+        struct clk *clk;
+        const char *parent_name;
+        const char *name = np->name;
+
+        parent_name = of_clk_get_parent_name(np, 0);
+        if (!parent_name)
+                return;
+
+        of_property_read_string(np, "clock-output-names", &name);
+
+        clk = at91sam9n12_clk_register_usb(pmc, name, parent_name);
+        if (IS_ERR(clk))
+                return;
+
+        of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+void __init of_at91rm9200_clk_usb_setup(struct device_node *np,
+                                        struct at91_pmc *pmc)
+{
+        struct clk *clk;
+        const char *parent_name;
+        const char *name = np->name;
+        u32 divisors[4] = {0, 0, 0, 0};
+
+        parent_name = of_clk_get_parent_name(np, 0);
+        if (!parent_name)
+                return;
+
+        of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4);
+        if (!divisors[0])
+                return;
+
+        of_property_read_string(np, "clock-output-names", &name);
+
+        clk = at91rm9200_clk_register_usb(pmc, name, parent_name, divisors);
+        if (IS_ERR(clk))
+                return;
+
+        of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index 0f667fd4e7fa..4fba500dec38 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -300,6 +300,21 @@ static const struct of_device_id pmc_clk_ids[] __initdata = {
                 .data = of_at91sam9x5_clk_utmi_setup,
         },
 #endif
+        /* USB clock */
+#if defined(CONFIG_HAVE_AT91_USB_CLK)
+        {
+                .compatible = "atmel,at91rm9200-clk-usb",
+                .data = of_at91rm9200_clk_usb_setup,
+        },
+        {
+                .compatible = "atmel,at91sam9x5-clk-usb",
+                .data = of_at91sam9x5_clk_usb_setup,
+        },
+        {
+                .compatible = "atmel,at91sam9n12-clk-usb",
+                .data = of_at91sam9n12_clk_usb_setup,
+        },
+#endif
         { /*sentinel*/ }
 };
 
diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
index 8e18ab0d8e22..2483ddc0868b 100644
--- a/drivers/clk/at91/pmc.h
+++ b/drivers/clk/at91/pmc.h
@@ -99,4 +99,13 @@ extern void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np,
                                                 struct at91_pmc *pmc);
 #endif
 
+#if defined(CONFIG_HAVE_AT91_USB_CLK)
+extern void __init of_at91rm9200_clk_usb_setup(struct device_node *np,
+                                               struct at91_pmc *pmc);
+extern void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
+                                               struct at91_pmc *pmc);
+extern void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,
+                                                struct at91_pmc *pmc);
+#endif
+
 #endif /* __PMC_H_ */