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Message-Id: <1370594119-5342-11-git-send-email-b.brezillon@overkiz.com>
Date: Fri, 7 Jun 2013 10:34:21 +0200
From: Boris BREZILLON <b.brezillon@...rkiz.com>
To: Mike Turquette <mturquette@...aro.org>,
Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
Nicolas Ferre <nicolas.ferre@...el.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Andrew Victor <linux@...im.org.za>
Cc: Boris BREZILLON <b.brezillon@...rkiz.com>,
Russell King <linux@....linux.org.uk>
Subject: [RFC 10/50] ARM: at91: add PMC smd clock support using common clk framework.
This is the at91 smd (Soft Modem) clock implementation using common clk
framework.
Not used by any driver right now.
Signed-off-by: Boris BREZILLON <b.brezillon@...rkiz.com>
---
arch/arm/mach-at91/Kconfig | 5 ++
drivers/clk/at91/Makefile | 1 +
drivers/clk/at91/clk-smd.c | 157 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 163 insertions(+)
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index ce4851d..8032871 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -27,6 +27,9 @@ config AT91_SAM9G45_RESET
config AT91_SAM9_TIME
bool
+config HAVE_AT91_SMD
+ bool
+
config SOC_AT91SAM9
bool
select AT91_SAM9_TIME
@@ -72,6 +75,7 @@ config SOC_SAMA5D3
select HAVE_FB_ATMEL
select HAVE_AT91_DBGU1
select HAVE_AT91_UTMI
+ select HAVE_AT91_SMD
select HAVE_AT91_USB_CLK
help
Select this if you are using one of Atmel's SAMA5D3 family SoC.
@@ -137,6 +141,7 @@ config SOC_AT91SAM9X5
select HAVE_FB_ATMEL
select SOC_AT91SAM9
select HAVE_AT91_UTMI
+ select HAVE_AT91_SMD
select HAVE_AT91_USB_CLK
help
Select this if you are using one of Atmel's AT91SAM9x5 family SoC.
diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile
index bbfd245..7206f4c 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-$(CONFIG_HAVE_AT91_USB_CLK) += clk-usb.o
+obj-$(CONFIG_HAVE_AT91_SMD) += clk-smd.o
diff --git a/drivers/clk/at91/clk-smd.c b/drivers/clk/at91/clk-smd.c
new file mode 100644
index 0000000..61bd8a5
--- /dev/null
+++ b/drivers/clk/at91/clk-smd.c
@@ -0,0 +1,157 @@
+/*
+ * drivers/clk/at91/clk-smd.c
+ *
+ * Copyright (C) 2013 Boris BREZILLON <b.brezillon@...rkiz.com>
+ *
+ * This smdram 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.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+
+#define SMD_SOURCE_MAX 2
+
+#define to_at91sam9x5_clk_smd(hw) \
+ container_of(hw, struct at91sam9x5_clk_smd, hw)
+struct at91sam9x5_clk_smd {
+ struct clk_hw hw;
+};
+
+static unsigned long at91sam9x5_clk_smd_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ u32 tmp;
+ u8 smddiv;
+ tmp = at91_pmc_read(AT91_PMC_SMD);
+ smddiv = (tmp & AT91_PMC_SMD_DIV) >> 8;
+ return parent_rate / (smddiv + 1);
+}
+
+static long at91sam9x5_clk_smd_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_smd_set_parent(struct clk_hw *hw, u8 index)
+{
+ u32 tmp;
+ if (index > 1)
+ return -EINVAL;
+ tmp = at91_pmc_read(AT91_PMC_SMD) & ~AT91_PMC_SMDS;
+ if (index)
+ tmp |= AT91_PMC_SMDS;
+ at91_pmc_write(AT91_PMC_SMD, tmp);
+ return 0;
+}
+
+static u8 at91sam9x5_clk_smd_get_parent(struct clk_hw *hw)
+{
+ return at91_pmc_read(AT91_PMC_SMD) & AT91_PMC_SMDS;
+}
+
+static int at91sam9x5_clk_smd_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ u32 tmp;
+ unsigned long div = parent_rate / rate;
+ if (parent_rate % rate || div < 1 || div > 16)
+ return -EINVAL;
+ tmp = at91_pmc_read(AT91_PMC_SMD) & ~AT91_PMC_SMD_DIV;
+ tmp |= (div - 1) << 8;
+ at91_pmc_write(AT91_PMC_SMD, tmp);
+
+ return 0;
+}
+
+static const struct clk_ops at91sam9x5_smd_ops = {
+ .recalc_rate = at91sam9x5_clk_smd_recalc_rate,
+ .round_rate = at91sam9x5_clk_smd_round_rate,
+ .get_parent = at91sam9x5_clk_smd_get_parent,
+ .set_parent = at91sam9x5_clk_smd_set_parent,
+ .set_rate = at91sam9x5_clk_smd_set_rate,
+};
+
+struct clk * __init
+at91sam9x5_clk_register_smd(const char *name, const char **parent_names,
+ u8 num_parents)
+{
+ struct at91sam9x5_clk_smd *smd;
+ struct clk *clk = NULL;
+ struct clk_init_data init;
+
+ smd = kzalloc(sizeof(*smd), GFP_KERNEL);
+ if (!smd)
+ return ERR_PTR(-ENOMEM);
+
+ init.name = name;
+ init.ops = &at91sam9x5_smd_ops;
+ init.parent_names = parent_names;
+ init.num_parents = num_parents;
+ init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
+
+ smd->hw.init = &init;
+
+ clk = clk_register(NULL, &smd->hw);
+
+ if (IS_ERR(clk))
+ kfree(smd);
+
+ return clk;
+}
+
+#if defined(CONFIG_OF)
+static void __init of_at91sam9x5_clk_smd_setup(struct device_node *np)
+{
+ struct clk *clk;
+ int i;
+ int num_parents;
+ const char *parent_names[SMD_SOURCE_MAX];
+ const char *name = np->name;
+
+ num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");
+ if (num_parents <= 0 || num_parents >= SMD_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_smd(name, parent_names, num_parents);
+
+ if (IS_ERR(clk))
+ return;
+
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+CLK_OF_DECLARE(at91sam9x5_clk_smd, "atmel,at91sam9x5-clk-smd",
+ of_at91sam9x5_clk_smd_setup);
+#endif
--
1.7.9.5
--
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