On 08/08/2013 09:15, Boris BREZILLON :
This patch adds new at91 usb clock implementation using common clk framework. This clock is used to clock usb ports (ohci, ehci and udc).
Blank line == "Ditto" ;-)
Signed-off-by: Boris BREZILLON <b.brezillon@xxxxxxxxxxx> --- arch/arm/mach-at91/Kconfig | 11 ++ drivers/clk/at91/Makefile | 1 + drivers/clk/at91/clk-usb.c | 323 ++++++++++++++++++++++++++++++++++++++++++++ drivers/clk/at91/pmc.c | 11 ++ drivers/clk/at91/pmc.h | 7 + 5 files changed, 353 insertions(+) create mode 100644 drivers/clk/at91/clk-usb.c diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig index 6ad37da..b76dc4c 100644 --- a/arch/arm/mach-at91/Kconfig +++ b/arch/arm/mach-at91/Kconfig @@ -3,6 +3,9 @@ if ARCH_AT91 config HAVE_AT91_UTMI bool +config HAVE_AT91_USB_CLK + bool + config HAVE_AT91_DBGU0 bool @@ -82,6 +85,7 @@ config SOC_SAMA5D3 select HAVE_AT91_DBGU1 select AT91_USE_OLD_CLK select HAVE_AT91_UTMI + select HAVE_AT91_USB_CLK help Select this if you are using one of Atmel's SAMA5D3 family SoC. This support covers SAMA5D31, SAMA5D33, SAMA5D34, SAMA5D35. @@ -96,12 +100,14 @@ config SOC_AT91RM9200 select MULTI_IRQ_HANDLER select SPARSE_IRQ select AT91_USE_OLD_CLK + select HAVE_AT91_USB_CLK config SOC_AT91SAM9260 bool "AT91SAM9260, AT91SAM9XE or AT91SAM9G20" select HAVE_AT91_DBGU0 select SOC_AT91SAM9 select AT91_USE_OLD_CLK + select HAVE_AT91_USB_CLK help Select this if you are using one of Atmel's AT91SAM9260, AT91SAM9XE or AT91SAM9G20 SoC. @@ -112,6 +118,7 @@ config SOC_AT91SAM9261 select HAVE_FB_ATMEL select SOC_AT91SAM9 select AT91_USE_OLD_CLK + select HAVE_AT91_USB_CLK help Select this if you are using one of Atmel's AT91SAM9261 or AT91SAM9G10 SoC. @@ -121,6 +128,7 @@ config SOC_AT91SAM9263 select HAVE_FB_ATMEL select SOC_AT91SAM9 select AT91_USE_OLD_CLK + select HAVE_AT91_USB_CLK config SOC_AT91SAM9RL bool "AT91SAM9RL" @@ -137,6 +145,7 @@ config SOC_AT91SAM9G45 select SOC_AT91SAM9 select AT91_USE_OLD_CLK select HAVE_AT91_UTMI + select HAVE_AT91_USB_CLK help Select this if you are using one of Atmel's AT91SAM9G45 family SoC. This support covers AT91SAM9G45, AT91SAM9G46, AT91SAM9M10 and AT91SAM9M11. @@ -148,6 +157,7 @@ config SOC_AT91SAM9X5 select SOC_AT91SAM9 select AT91_USE_OLD_CLK select HAVE_AT91_UTMI + select HAVE_AT91_USB_CLK help Select this if you are using one of Atmel's AT91SAM9x5 family SoC. This means that your SAM9 name finishes with a '5' (except if it is @@ -161,6 +171,7 @@ config SOC_AT91SAM9N12 select HAVE_FB_ATMEL select SOC_AT91SAM9 select AT91_USE_OLD_CLK + select HAVE_AT91_USB_CLK help Select this if you are using Atmel's AT91SAM9N12 SoC. diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile index a824883..61db058 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 0000000..12c20a0 --- /dev/null +++ b/drivers/clk/at91/clk-usb.c @@ -0,0 +1,323 @@ +/* + * drivers/clk/at91/clk-usb.c + * + * Copyright (C) 2013 Boris BREZILLON <b.brezillon@xxxxxxxxxxx> + * + * 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 to_at91sam9x5_clk_usb(hw) \ + container_of(hw, struct at91sam9x5_clk_usb, hw) +struct at91sam9x5_clk_usb { + struct clk_hw hw; + struct at91_pmc *pmc; + u8 usbs0_unused; /* sam9n12 uses usbs0 to disable usb clock */
Same remark as PLL patch. So maybe make the sam9n12 as a special case.
+}; + +#define to_at91rm9200_clk_usb(hw) \ + container_of(hw, struct at91rm9200_clk_usb, hw) +struct at91rm9200_clk_usb { + struct clk_hw hw; + struct at91_pmc *pmc; + u32 divisors[4]; +}; + +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) >> 8;
+ 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 > 15) + return *parent_rate / 16;
+ + 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 (usb->usbs0_unused) + index++; + 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; + + if (usb->usbs0_unused) + return 0; + + 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 > 16)
+ return -EINVAL; + + tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV; + tmp |= (div - 1) << 8; + 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 struct clk * __init +at91sam9x5_clk_register_usb(struct at91_pmc *pmc, const char *name, + const char **parent_names, u8 num_parents, + u8 usbs0_unused) +{ + 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->usbs0_unused = usbs0_unused; + 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) >> 28;
macro
+ 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 < 4; i++) { + if (usb->divisors[i] == div) { + tmp = pmc_read(pmc, AT91_CKGR_PLLBR) & + ~AT91_PMC_USBDIV; + tmp |= i << 8;
+ pmc_write(pmc, AT91_PMC_USB, 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; + u8 usbs0_unused; + 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; + } + + usbs0_unused = of_property_read_bool(np, "atmel,usb-clk-src0-unused"); + of_property_read_string(np, "clock-output-names", &name); + + clk = at91sam9x5_clk_register_usb(pmc, name, parent_names, num_parents, + usbs0_unused); +
+ 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 238f0d2..e46de3d 100644 --- a/drivers/clk/at91/pmc.c +++ b/drivers/clk/at91/pmc.c @@ -287,6 +287,17 @@ 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, + }, +#endif { /*sentinel*/ } }; diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h index 3ba9503..b2efff5 100644 --- a/drivers/clk/at91/pmc.h +++ b/drivers/clk/at91/pmc.h @@ -96,4 +96,11 @@ 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); +#endif + #endif /* __PMC_H_ */
-- Nicolas Ferre -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html