ARM: at91: introduce SAMA5 support

This patch introduces the SAMA5 support and a generic board file for SAMA5
devices. It also updates the PMC driver to manage clock division which is a
requirement since some peripherals can't work at the bus frequency on SAMA5.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/mach-at91/Kconfig

@@ -29,6 +29,14 @@ config SOC_AT91SAM9
 	select MULTI_IRQ_HANDLER
 	select SPARSE_IRQ
 
+config SOC_SAMA5
+	bool
+	select AT91_SAM9_TIME
+	select CPU_V7
+	select GENERIC_CLOCKEVENTS
+	select MULTI_IRQ_HANDLER
+	select SPARSE_IRQ
+
 menu "Atmel AT91 System-on-Chip"
 
 choice
@@ -41,10 +49,27 @@ config SOC_SAM_V4_V5
 	  Select this if you are using one of Atmel's AT91SAM9, AT91RM9200
 	  or AT91X40 SoC.
 
+config SOC_SAM_V7
+	bool "Cortex A5"
+	help
+	  Select this if you are using one of Atmel's SAMA5D3 SoC.
+
 endchoice
 
 comment "Atmel AT91 Processor"
 
+if SOC_SAM_V7
+config SOC_SAMA5D3
+	bool "SAMA5D3 family"
+	depends on SOC_SAM_V7
+	select SOC_SAMA5
+	select HAVE_FB_ATMEL
+	select HAVE_AT91_DBGU1
+	help
+	  Select this if you are using one of Atmel's SAMA5D3 family SoC.
+	  This support covers SAMA5D31, SAMA5D33, SAMA5D34, SAMA5D35.
+endif
+
 if SOC_SAM_V4_V5
 config SOC_AT91RM9200
 	bool "AT91RM9200"
@@ -134,6 +159,14 @@ config MACH_AT91SAM9_DT
 	  Select this if you want to experiment device-tree with
 	  an Atmel Evaluation Kit.
 
+config MACH_SAMA5_DT
+	bool "Atmel SAMA5 Evaluation Kits with device-tree support"
+	depends on SOC_SAMA5
+	select USE_OF
+	help
+	  Select this if you want to experiment device-tree with
+	  an Atmel Evaluation Kit.
+
 # ----------------------------------------------------------
 
 comment "AT91 Feature Selections"

arch/arm/mach-at91/Makefile

@@ -22,6 +22,7 @@ obj-$(CONFIG_SOC_AT91SAM9G45)	+= at91sam9g45.o
 obj-$(CONFIG_SOC_AT91SAM9N12)	+= at91sam9n12.o
 obj-$(CONFIG_SOC_AT91SAM9X5)	+= at91sam9x5.o
 obj-$(CONFIG_SOC_AT91SAM9RL)	+= at91sam9rl.o
+obj-$(CONFIG_SOC_SAMA5D3)	+= sama5d3.o
 
 obj-$(CONFIG_ARCH_AT91RM9200)	+= at91rm9200_devices.o
 obj-$(CONFIG_ARCH_AT91SAM9260)	+= at91sam9260_devices.o
@@ -91,6 +92,9 @@ obj-$(CONFIG_MACH_AT91SAM9M10G45EK) += board-sam9m10g45ek.o
 obj-$(CONFIG_MACH_AT91RM9200_DT) += board-dt-rm9200.o
 obj-$(CONFIG_MACH_AT91SAM9_DT) += board-dt-sam9.o
 
+# SAMA5 board with device-tree
+obj-$(CONFIG_MACH_SAMA5_DT) += board-dt-sama5.o
+
 # AT91X40 board-specific support
 obj-$(CONFIG_MACH_AT91EB01)	+= board-eb01.o
 

arch/arm/mach-at91/board-dt-sama5.c

@@ -0,0 +1,86 @@
+/*
+ *  Setup code for SAMA5 Evaluation Kits with Device Tree support
+ *
+ *  Copyright (C) 2013 Atmel,
+ *                2013 Ludovic Desroches <ludovic.desroches@atmel.com>
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/micrel_phy.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/phy.h>
+
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/mach/irq.h>
+
+#include "at91_aic.h"
+#include "generic.h"
+
+
+static const struct of_device_id irq_of_match[] __initconst = {
+
+	{ .compatible = "atmel,sama5d3-aic", .data = at91_aic5_of_init },
+	{ /*sentinel*/ }
+};
+
+static void __init at91_dt_init_irq(void)
+{
+	of_irq_init(irq_of_match);
+}
+
+static int ksz9021rn_phy_fixup(struct phy_device *phy)
+{
+	int value;
+
+#define GMII_RCCPSR	260
+#define GMII_RRDPSR	261
+#define GMII_ERCR	11
+#define GMII_ERDWR	12
+
+	/* Set delay values */
+	value = GMII_RCCPSR | 0x8000;
+	phy_write(phy, GMII_ERCR, value);
+	value = 0xF2F4;
+	phy_write(phy, GMII_ERDWR, value);
+	value = GMII_RRDPSR | 0x8000;
+	phy_write(phy, GMII_ERCR, value);
+	value = 0x2222;
+	phy_write(phy, GMII_ERDWR, value);
+
+	return 0;
+}
+
+static void __init sama5_dt_device_init(void)
+{
+	if (of_machine_is_compatible("atmel,sama5d3xcm"))
+		phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
+			ksz9021rn_phy_fixup);
+
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+}
+
+static const char *sama5_dt_board_compat[] __initdata = {
+	"atmel,sama5",
+	NULL
+};
+
+DT_MACHINE_START(sama5_dt, "Atmel SAMA5 (Device Tree)")
+	/* Maintainer: Atmel */
+	.init_time	= at91sam926x_pit_init,
+	.map_io		= at91_map_io,
+	.handle_irq	= at91_aic5_handle_irq,
+	.init_early	= at91_dt_initialize,
+	.init_irq	= at91_dt_init_irq,
+	.init_machine	= sama5_dt_device_init,
+	.dt_compat	= sama5_dt_board_compat,
+MACHINE_END

arch/arm/mach-at91/clock.c

@@ -54,7 +54,10 @@ EXPORT_SYMBOL_GPL(at91_pmc_base);
  */
 #define cpu_has_utmi()		(  cpu_is_at91sam9rl() \
 				|| cpu_is_at91sam9g45() \
-				|| cpu_is_at91sam9x5())
+				|| cpu_is_at91sam9x5() \
+				|| cpu_is_sama5d3())
+
+#define cpu_has_1056M_plla()	(cpu_is_sama5d3())
 
 #define cpu_has_800M_plla()	(  cpu_is_at91sam9g20() \
 				|| cpu_is_at91sam9g45() \
@@ -75,26 +78,31 @@ EXPORT_SYMBOL_GPL(at91_pmc_base);
 				|| cpu_is_at91sam9n12()))
 
 #define cpu_has_upll()		(cpu_is_at91sam9g45() \
-				|| cpu_is_at91sam9x5())
+				|| cpu_is_at91sam9x5() \
+				|| cpu_is_sama5d3())
 
 /* USB host HS & FS */
 #define cpu_has_uhp()		(!cpu_is_at91sam9rl())
 
 /* USB device FS only */
 #define cpu_has_udpfs()		(!(cpu_is_at91sam9rl() \
 				|| cpu_is_at91sam9g45() \
-				|| cpu_is_at91sam9x5()))
+				|| cpu_is_at91sam9x5() \
+				|| cpu_is_sama5d3()))
 
 #define cpu_has_plladiv2()	(cpu_is_at91sam9g45() \
 				|| cpu_is_at91sam9x5() \
-				|| cpu_is_at91sam9n12())
+				|| cpu_is_at91sam9n12() \
+				|| cpu_is_sama5d3())
 
 #define cpu_has_mdiv3()		(cpu_is_at91sam9g45() \
 				|| cpu_is_at91sam9x5() \
-				|| cpu_is_at91sam9n12())
+				|| cpu_is_at91sam9n12() \
+				|| cpu_is_sama5d3())
 
 #define cpu_has_alt_prescaler()	(cpu_is_at91sam9x5() \
-				|| cpu_is_at91sam9n12())
+				|| cpu_is_at91sam9n12() \
+				|| cpu_is_sama5d3())
 
 static LIST_HEAD(clocks);
 static DEFINE_SPINLOCK(clk_lock);
@@ -210,10 +218,26 @@ struct clk mck = {
 
 static void pmc_periph_mode(struct clk *clk, int is_on)
 {
-	if (is_on)
-		at91_pmc_write(AT91_PMC_PCER, clk->pmc_mask);
-	else
-		at91_pmc_write(AT91_PMC_PCDR, clk->pmc_mask);
+	u32 regval = 0;
+
+	/*
+	 * With sama5d3 devices, we are managing clock division so we have to
+	 * use the Peripheral Control Register introduced from at91sam9x5
+	 * devices.
+	 */
+	if (cpu_is_sama5d3()) {
+		regval |= AT91_PMC_PCR_CMD; /* write command */
+		regval |= clk->pid & AT91_PMC_PCR_PID; /* peripheral selection */
+		regval |= AT91_PMC_PCR_DIV(clk->div);
+		if (is_on)
+			regval |= AT91_PMC_PCR_EN; /* enable clock */
+		at91_pmc_write(AT91_PMC_PCR, regval);
+	} else {
+		if (is_on)
+			at91_pmc_write(AT91_PMC_PCER, clk->pmc_mask);
+		else
+			at91_pmc_write(AT91_PMC_PCDR, clk->pmc_mask);
+	}
 }
 
 static struct clk __init *at91_css_to_clk(unsigned long css)
@@ -443,14 +467,18 @@ static void __init init_programmable_clock(struct clk *clk)
 
 static int at91_clk_show(struct seq_file *s, void *unused)
 {
-	u32		scsr, pcsr, uckr = 0, sr;
+	u32		scsr, pcsr, pcsr1 = 0, uckr = 0, sr;
 	struct clk	*clk;
 
 	scsr = at91_pmc_read(AT91_PMC_SCSR);
 	pcsr = at91_pmc_read(AT91_PMC_PCSR);
+	if (cpu_is_sama5d3())
+		pcsr1 = at91_pmc_read(AT91_PMC_PCSR1);
 	sr = at91_pmc_read(AT91_PMC_SR);
 	seq_printf(s, "SCSR = %8x\n", scsr);
 	seq_printf(s, "PCSR = %8x\n", pcsr);
+	if (cpu_is_sama5d3())
+		seq_printf(s, "PCSR1 = %8x\n", pcsr1);
 	seq_printf(s, "MOR  = %8x\n", at91_pmc_read(AT91_CKGR_MOR));
 	seq_printf(s, "MCFR = %8x\n", at91_pmc_read(AT91_CKGR_MCFR));
 	seq_printf(s, "PLLA = %8x\n", at91_pmc_read(AT91_CKGR_PLLAR));
@@ -470,20 +498,30 @@ static int at91_clk_show(struct seq_file *s, void *unused)
 	list_for_each_entry(clk, &clocks, node) {
 		char	*state;
 
-		if (clk->mode == pmc_sys_mode)
+		if (clk->mode == pmc_sys_mode) {
 			state = (scsr & clk->pmc_mask) ? "on" : "off";
-		else if (clk->mode == pmc_periph_mode)
-			state = (pcsr & clk->pmc_mask) ? "on" : "off";
-		else if (clk->mode == pmc_uckr_mode)
+		} else if (clk->mode == pmc_periph_mode) {
+			if (cpu_is_sama5d3()) {
+				u32 pmc_mask = 1 << (clk->pid % 32);
+
+				if (clk->pid > 31)
+					state = (pcsr1 & pmc_mask) ? "on" : "off";
+				else
+					state = (pcsr & pmc_mask) ? "on" : "off";
+			} else {
+				state = (pcsr & clk->pmc_mask) ? "on" : "off";
+			}
+		} else if (clk->mode == pmc_uckr_mode) {
 			state = (uckr & clk->pmc_mask) ? "on" : "off";
-		else if (clk->pmc_mask)
+		} else if (clk->pmc_mask) {
 			state = (sr & clk->pmc_mask) ? "on" : "off";
-		else if (clk == &clk32k || clk == &main_clk)
+		} else if (clk == &clk32k || clk == &main_clk) {
 			state = "on";
-		else
+		} else {
 			state = "";
+		}
 
-		seq_printf(s, "%-10s users=%2d %-3s %9ld Hz %s\n",
+		seq_printf(s, "%-10s users=%2d %-3s %9lu Hz %s\n",
 			clk->name, clk->users, state, clk_get_rate(clk),
 			clk->parent ? clk->parent->name : "");
 	}
@@ -530,6 +568,9 @@ int __init clk_register(struct clk *clk)
 	if (clk_is_peripheral(clk)) {
 		if (!clk->parent)
 			clk->parent = &mck;
+		if (cpu_is_sama5d3())
+			clk->rate_hz = DIV_ROUND_UP(clk->parent->rate_hz,
+						    1 << clk->div);
 		clk->mode = pmc_periph_mode;
 	}
 	else if (clk_is_sys(clk)) {
@@ -555,7 +596,11 @@ static u32 __init at91_pll_rate(struct clk *pll, u32 freq, u32 reg)
 	unsigned mul, div;
 
 	div = reg & 0xff;
-	mul = (reg >> 16) & 0x7ff;
+	if (cpu_is_sama5d3())
+		mul = AT91_PMC3_MUL_GET(reg);
+	else
+		mul = AT91_PMC_MUL_GET(reg);
+
 	if (div && mul) {
 		freq /= div;
 		freq *= mul + 1;
@@ -706,12 +751,15 @@ static int __init at91_pmc_init(unsigned long main_clock)
 
 	/* report if PLLA is more than mildly overclocked */
 	plla.rate_hz = at91_pll_rate(&plla, main_clock, at91_pmc_read(AT91_CKGR_PLLAR));
-	if (cpu_has_300M_plla()) {
-		if (plla.rate_hz > 300000000)
+	if (cpu_has_1056M_plla()) {
+		if (plla.rate_hz > 1056000000)
 			pll_overclock = true;
 	} else if (cpu_has_800M_plla()) {
 		if (plla.rate_hz > 800000000)
 			pll_overclock = true;
+	} else if (cpu_has_300M_plla()) {
+		if (plla.rate_hz > 300000000)
+			pll_overclock = true;
 	} else if (cpu_has_240M_plla()) {
 		if (plla.rate_hz > 240000000)
 			pll_overclock = true;
@@ -872,24 +920,35 @@ int __init at91_clock_init(unsigned long main_clock)
 static int __init at91_clock_reset(void)
 {
 	unsigned long pcdr = 0;
+	unsigned long pcdr1 = 0;
 	unsigned long scdr = 0;
 	struct clk *clk;
 
 	list_for_each_entry(clk, &clocks, node) {
 		if (clk->users > 0)
 			continue;
 
-		if (clk->mode == pmc_periph_mode)
-			pcdr |= clk->pmc_mask;
+		if (clk->mode == pmc_periph_mode) {
+			if (cpu_is_sama5d3()) {
+				u32 pmc_mask = 1 << (clk->pid % 32);
+
+				if (clk->pid > 31)
+					pcdr1 |= pmc_mask;
+				else
+					pcdr |= pmc_mask;
+			} else
+				pcdr |= clk->pmc_mask;
+		}
 
 		if (clk->mode == pmc_sys_mode)
 			scdr |= clk->pmc_mask;
 
 		pr_debug("Clocks: disable unused %s\n", clk->name);
 	}
 
-	at91_pmc_write(AT91_PMC_PCDR, pcdr);
 	at91_pmc_write(AT91_PMC_SCDR, scdr);
+	if (cpu_is_sama5d3())
+		at91_pmc_write(AT91_PMC_PCDR1, pcdr1);
 
 	return 0;
 }

arch/arm/mach-at91/clock.h

@@ -20,7 +20,9 @@ struct clk {
 	const char	*name;		/* unique clock name */
 	struct clk_lookup cl;
 	unsigned long	rate_hz;
+	unsigned	div;		/* parent clock divider */
 	struct clk	*parent;
+	unsigned	pid;		/* peripheral ID */
 	u32		pmc_mask;
 	void		(*mode)(struct clk *, int);
 	unsigned	id:3;		/* PCK0..4, or 32k/main/a/b */