[PATCH v2 13/14] AT91: PIT: Convert to an early_platform_device

From: Maxime Ripard
Date: Tue Jul 01 2014 - 05:37:34 EST

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Convert the legacy probing mechanism to the early_platform_driver probe.

This will allow a clear separation between the driver and the machine setup
code, which will in turn ease the move out of mach-at91.

Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-at91/at91sam9260.c | 30 ++++++++++++++++++++++++--
arch/arm/mach-at91/at91sam9261.c | 30 ++++++++++++++++++++++++--
arch/arm/mach-at91/at91sam9263.c | 30 ++++++++++++++++++++++++--
arch/arm/mach-at91/at91sam926x_time.c | 40 ++++++++++++++++++++---------------
arch/arm/mach-at91/at91sam9g45.c | 31 +++++++++++++++++++++++++--
arch/arm/mach-at91/at91sam9rl.c | 30 ++++++++++++++++++++++++--
arch/arm/mach-at91/generic.h | 2 --
7 files changed, 164 insertions(+), 29 deletions(-)

diff --git a/arch/arm/mach-at91/at91sam9260.c b/arch/arm/mach-at91/at91sam9260.c
index d5141af1947c..a64ecaf905c0 100644
--- a/arch/arm/mach-at91/at91sam9260.c
+++ b/arch/arm/mach-at91/at91sam9260.c
@@ -341,7 +341,6 @@ static void __init at91sam9260_ioremap_registers(void)
at91_ioremap_shdwc(AT91SAM9260_BASE_SHDWC);
at91_ioremap_rstc(AT91SAM9260_BASE_RSTC);
at91_ioremap_ramc(0, AT91SAM9260_BASE_SDRAMC, 512);
- at91sam926x_ioremap_pit(AT91SAM9260_BASE_PIT);
at91sam9_ioremap_smc(0, AT91SAM9260_BASE_SMC);
at91_ioremap_matrix(AT91SAM9260_BASE_MATRIX);
at91_pm_set_standby(at91sam9_sdram_standby);
@@ -400,9 +399,36 @@ static unsigned int at91sam9260_default_irq_priority[NR_AIC_IRQS] __initdata = {
0, /* Advanced Interrupt Controller */
};

+static struct resource pit_resources[] = {
+ [0] = {
+ .start = AT91SAM9260_BASE_PIT,
+ .end = AT91SAM9260_BASE_PIT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ [1] = {
+ .start = NR_IRQS_LEGACY + AT91_ID_SYS,
+ .end = NR_IRQS_LEGACY + AT91_ID_SYS,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct platform_device pit_device = {
+ .name = "at91_pit",
+ .resource = pit_resources,
+ .num_resources = ARRAY_SIZE(pit_resources),
+};
+
+static struct platform_device *at91sam9260_early_devices[] __initdata = {
+ &pit_device,
+};
+
static void __init at91sam9260_init_time(void)
{
- at91sam926x_pit_init();
+ early_platform_add_devices(at91sam9260_early_devices,
+ ARRAY_SIZE(at91sam9260_early_devices));
+
+ early_platform_driver_register_all("earlytimer");
+ early_platform_driver_probe("earlytimer", 1, 0);
}

AT91_SOC_START(at91sam9260)
diff --git a/arch/arm/mach-at91/at91sam9261.c b/arch/arm/mach-at91/at91sam9261.c
index 5416fe4d5a0b..c8f85ace7f33 100644
--- a/arch/arm/mach-at91/at91sam9261.c
+++ b/arch/arm/mach-at91/at91sam9261.c
@@ -304,7 +304,6 @@ static void __init at91sam9261_ioremap_registers(void)
at91_ioremap_shdwc(AT91SAM9261_BASE_SHDWC);
at91_ioremap_rstc(AT91SAM9261_BASE_RSTC);
at91_ioremap_ramc(0, AT91SAM9261_BASE_SDRAMC, 512);
- at91sam926x_ioremap_pit(AT91SAM9261_BASE_PIT);
at91sam9_ioremap_smc(0, AT91SAM9261_BASE_SMC);
at91_ioremap_matrix(AT91SAM9261_BASE_MATRIX);
at91_pm_set_standby(at91sam9_sdram_standby);
@@ -363,9 +362,36 @@ static unsigned int at91sam9261_default_irq_priority[NR_AIC_IRQS] __initdata = {
0, /* Advanced Interrupt Controller */
};

+static struct resource pit_resources[] = {
+ [0] = {
+ .start = AT91SAM9261_BASE_PIT,
+ .end = AT91SAM9261_BASE_PIT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ [1] = {
+ .start = NR_IRQS_LEGACY + AT91_ID_SYS,
+ .end = NR_IRQS_LEGACY + AT91_ID_SYS,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct platform_device pit_device = {
+ .name = "at91_pit",
+ .resource = pit_resources,
+ .num_resources = ARRAY_SIZE(pit_resources),
+};
+
+static struct platform_device *at91sam9261_early_devices[] __initdata = {
+ &pit_device,
+};
+
static void __init at91sam9261_init_time(void)
{
- at91sam926x_pit_init();
+ early_platform_add_devices(at91sam9261_early_devices,
+ ARRAY_SIZE(at91sam9261_early_devices));
+
+ early_platform_driver_register_all("earlytimer");
+ early_platform_driver_probe("earlytimer", 1, 0);
}

AT91_SOC_START(at91sam9261)
diff --git a/arch/arm/mach-at91/at91sam9263.c b/arch/arm/mach-at91/at91sam9263.c
index 20b46118338c..b4bdfc20e0df 100644
--- a/arch/arm/mach-at91/at91sam9263.c
+++ b/arch/arm/mach-at91/at91sam9263.c
@@ -320,7 +320,6 @@ static void __init at91sam9263_ioremap_registers(void)
at91_ioremap_rstc(AT91SAM9263_BASE_RSTC);
at91_ioremap_ramc(0, AT91SAM9263_BASE_SDRAMC0, 512);
at91_ioremap_ramc(1, AT91SAM9263_BASE_SDRAMC1, 512);
- at91sam926x_ioremap_pit(AT91SAM9263_BASE_PIT);
at91sam9_ioremap_smc(0, AT91SAM9263_BASE_SMC0);
at91sam9_ioremap_smc(1, AT91SAM9263_BASE_SMC1);
at91_ioremap_matrix(AT91SAM9263_BASE_MATRIX);
@@ -381,9 +380,36 @@ static unsigned int at91sam9263_default_irq_priority[NR_AIC_IRQS] __initdata = {
0, /* Advanced Interrupt Controller (IRQ1) */
};

+static struct resource pit_resources[] = {
+ [0] = {
+ .start = AT91SAM9263_BASE_PIT,
+ .end = AT91SAM9263_BASE_PIT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ [1] = {
+ .start = NR_IRQS_LEGACY + AT91_ID_SYS,
+ .end = NR_IRQS_LEGACY + AT91_ID_SYS,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct platform_device pit_device = {
+ .name = "at91_pit",
+ .resource = pit_resources,
+ .num_resources = ARRAY_SIZE(pit_resources),
+};
+
+static struct platform_device *at91sam9263_early_devices[] __initdata = {
+ &pit_device,
+};
+
static void __init at91sam9263_init_time(void)
{
- at91sam926x_pit_init();
+ early_platform_add_devices(at91sam9263_early_devices,
+ ARRAY_SIZE(at91sam9263_early_devices));
+
+ early_platform_driver_register_all("earlytimer");
+ early_platform_driver_probe("earlytimer", 1, 0);
}

AT91_SOC_START(at91sam9263)
diff --git a/arch/arm/mach-at91/at91sam926x_time.c b/arch/arm/mach-at91/at91sam926x_time.c
index 9abb289dce72..6fd97875bb5c 100644
--- a/arch/arm/mach-at91/at91sam926x_time.c
+++ b/arch/arm/mach-at91/at91sam926x_time.c
@@ -15,15 +15,15 @@
#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/interrupt.h>
+#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
+#include <linux/platform_device.h>
#include <linux/slab.h>

-#include <mach/hardware.h>
-
#define AT91_PIT_MR 0x00 /* Mode Register */
#define AT91_PIT_PITIEN BIT(25) /* Timer Interrupt Enable */
#define AT91_PIT_PITEN BIT(24) /* Timer Enabled */
@@ -265,34 +265,40 @@ static void __init at91sam926x_pit_dt_init(struct device_node *node)
CLOCKSOURCE_OF_DECLARE(at91sam926x_pit, "atmel,at91sam9260-pit",
at91sam926x_pit_dt_init);

-static void __iomem *pit_base_addr;
-
-void __init at91sam926x_pit_init(void)
+static int __init pit_early_probe(struct platform_device *pdev)
{
struct pit_data *data;
+ struct resource *res;

data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
panic(pr_fmt("Unable to allocate memory\n"));

- data->base = pit_base_addr;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!request_mem_region(res->start, resource_size(res), "at91_pit"))
+ panic(pr_fmt("Unable to request memory region\n"));
+
+ data->base = ioremap(res->start, resource_size(res));
+ if (!data->base)
+ panic(pr_fmt("Impossible to ioremap PIT\n"));

data->mck = clk_get(NULL, "mck");
if (IS_ERR(data->mck))
panic(pr_fmt("Unable to get mck clk\n"));

- data->irq = NR_IRQS_LEGACY + AT91_ID_SYS;
+ data->irq = platform_get_irq(pdev, 0);
+ if (data->irq < 0)
+ panic(pr_fmt("Unable to get IRQ from resources\n"));

at91sam926x_pit_common_init(data);
-}

-void __init at91sam926x_ioremap_pit(u32 addr)
-{
- if (of_have_populated_dt())
- return;
-
- pit_base_addr = ioremap(addr, 16);
-
- if (!pit_base_addr)
- panic(pr_fmt("Impossible to ioremap PIT\n"));
+ return 0;
}
+
+static struct platform_driver pit_driver __initdata = {
+ .probe = pit_early_probe,
+ .driver = {
+ .name = "at91_pit",
+ },
+};
+early_platform_init("earlytimer", &pit_driver);
diff --git a/arch/arm/mach-at91/at91sam9g45.c b/arch/arm/mach-at91/at91sam9g45.c
index 924d362121ef..b7ab0998afce 100644
--- a/arch/arm/mach-at91/at91sam9g45.c
+++ b/arch/arm/mach-at91/at91sam9g45.c
@@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/clk/at91_pmc.h>
+#include <linux/platform_device.h>

#include <asm/irq.h>
#include <asm/mach/arch.h>
@@ -370,7 +371,6 @@ static void __init at91sam9g45_ioremap_registers(void)
at91_ioremap_rstc(AT91SAM9G45_BASE_RSTC);
at91_ioremap_ramc(0, AT91SAM9G45_BASE_DDRSDRC1, 512);
at91_ioremap_ramc(1, AT91SAM9G45_BASE_DDRSDRC0, 512);
- at91sam926x_ioremap_pit(AT91SAM9G45_BASE_PIT);
at91sam9_ioremap_smc(0, AT91SAM9G45_BASE_SMC);
at91_ioremap_matrix(AT91SAM9G45_BASE_MATRIX);
at91_pm_set_standby(at91_ddr_standby);
@@ -430,9 +430,36 @@ static unsigned int at91sam9g45_default_irq_priority[NR_AIC_IRQS] __initdata = {
0, /* Advanced Interrupt Controller (IRQ0) */
};

+static struct resource pit_resources[] = {
+ [0] = {
+ .start = AT91SAM9G45_BASE_PIT,
+ .end = AT91SAM9G45_BASE_PIT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ [1] = {
+ .start = NR_IRQS_LEGACY + AT91_ID_SYS,
+ .end = NR_IRQS_LEGACY + AT91_ID_SYS,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct platform_device pit_device = {
+ .name = "at91_pit",
+ .resource = pit_resources,
+ .num_resources = ARRAY_SIZE(pit_resources),
+};
+
+static struct platform_device *at91sam9g45_early_devices[] __initdata = {
+ &pit_device,
+};
+
static void __init at91sam9g45_init_time(void)
{
- at91sam926x_pit_init();
+ early_platform_add_devices(at91sam9g45_early_devices,
+ ARRAY_SIZE(at91sam9g45_early_devices));
+
+ early_platform_driver_register_all("earlytimer");
+ early_platform_driver_probe("earlytimer", 1, 0);
}

AT91_SOC_START(at91sam9g45)
diff --git a/arch/arm/mach-at91/at91sam9rl.c b/arch/arm/mach-at91/at91sam9rl.c
index dd4a8deb5b36..664c29efdf3e 100644
--- a/arch/arm/mach-at91/at91sam9rl.c
+++ b/arch/arm/mach-at91/at91sam9rl.c
@@ -313,7 +313,6 @@ static void __init at91sam9rl_ioremap_registers(void)
at91_ioremap_shdwc(AT91SAM9RL_BASE_SHDWC);
at91_ioremap_rstc(AT91SAM9RL_BASE_RSTC);
at91_ioremap_ramc(0, AT91SAM9RL_BASE_SDRAMC, 512);
- at91sam926x_ioremap_pit(AT91SAM9RL_BASE_PIT);
at91sam9_ioremap_smc(0, AT91SAM9RL_BASE_SMC);
at91_ioremap_matrix(AT91SAM9RL_BASE_MATRIX);
at91_pm_set_standby(at91sam9_sdram_standby);
@@ -373,9 +372,36 @@ static unsigned int at91sam9rl_default_irq_priority[NR_AIC_IRQS] __initdata = {
0, /* Advanced Interrupt Controller */
};

+static struct resource pit_resources[] = {
+ [0] = {
+ .start = AT91SAM9RL_BASE_PIT,
+ .end = AT91SAM9RL_BASE_PIT + SZ_16 - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ [1] = {
+ .start = NR_IRQS_LEGACY + AT91_ID_SYS,
+ .end = NR_IRQS_LEGACY + AT91_ID_SYS,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+static struct platform_device pit_device = {
+ .name = "at91_pit",
+ .resource = pit_resources,
+ .num_resources = ARRAY_SIZE(pit_resources),
+};
+
+static struct platform_device *at91sam9rl_early_devices[] __initdata = {
+ &pit_device,
+};
+
static void __init at91sam9rl_init_time(void)
{
- at91sam926x_pit_init();
+ early_platform_add_devices(at91sam9rl_early_devices,
+ ARRAY_SIZE(at91sam9rl_early_devices));
+
+ early_platform_driver_register_all("earlytimer");
+ early_platform_driver_probe("earlytimer", 1, 0);
}

AT91_SOC_START(at91sam9rl)
diff --git a/arch/arm/mach-at91/generic.h b/arch/arm/mach-at91/generic.h
index eb5512c3d717..2269d5fb83a9 100644
--- a/arch/arm/mach-at91/generic.h
+++ b/arch/arm/mach-at91/generic.h
@@ -45,8 +45,6 @@ extern void __init at91_sysirq_mask_rtt(u32 rtt_base);
extern void __init at91_init_time(void);
extern void at91rm9200_ioremap_st(u32 addr);
extern void at91rm9200_timer_init(void);
-extern void at91sam926x_ioremap_pit(u32 addr);
-extern void at91sam926x_pit_init(void);
extern void at91x40_timer_init(void);

/* Clocks */
--
2.0.0

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