ARM: vexpress: Start using new Versatile Express infrastructure

This patch starts using all the configuration infrastructure.

- generic GPIO library is forced now

- sysreg GPIOs are used as MMC CD and WP information sources;
  thanks to this MMCI auxiliary data is not longer necessary

- DVI muxer and mode control is removed from non-DT V2P-CA9 code
  as this is now handled by the vexpress-dvi driver

- clock generators control is removed as is being handled by the
  common clock driver now

- the sysreg and sysctl control is now delegated to the
  appropriate drivers and all related code was removed

- NOR Flash set_vpp function has been removed as the control
  bit used does _not_ control its VPP line, but the #WP signal
  instead (which is de facto unusable in case of Linux MTD
  drivers); this also allowed the remove its DT auxiliary
  data

The non-DT code defines only minimal required number of
the config devices. Device Trees are updated to make use
of all new features.

Signed-off-by: Pawel Moll <pawel.moll@arm.com>

1 files changed, 79 insertions, 253 deletions

diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c
index 560e0df728f8..99d4172816be 100644
--- a/arch/arm/mach-vexpress/v2m.c
+++ b/arch/arm/mach-vexpress/v2m.c
@@ -16,11 +16,10 @@
 #include <linux/smsc911x.h>
 #include <linux/spinlock.h>
 #include <linux/usb/isp1760.h>
-#include <linux/clkdev.h>
-#include <linux/clk-provider.h>
 #include <linux/mtd/physmap.h>
 #include <linux/regulator/fixed.h>
 #include <linux/regulator/machine.h>
+#include <linux/vexpress.h>
 
 #include <asm/arch_timer.h>
 #include <asm/mach-types.h>
@@ -33,7 +32,6 @@
 #include <asm/hardware/cache-l2x0.h>
 #include <asm/hardware/gic.h>
 #include <asm/hardware/timer-sp.h>
-#include <asm/hardware/sp810.h>
 
 #include <mach/ct-ca9x4.h>
 #include <mach/motherboard.h>
@@ -58,22 +56,6 @@ static struct map_desc v2m_io_desc[] __initdata = {
 	},
 };
 
-static void __iomem *v2m_sysreg_base;
-
-static void __init v2m_sysctl_init(void __iomem *base)
-{
-	u32 scctrl;
-
-	if (WARN_ON(!base))
-		return;
-
-	/* Select 1MHz TIMCLK as the reference clock for SP804 timers */
-	scctrl = readl(base + SCCTRL);
-	scctrl |= SCCTRL_TIMEREN0SEL_TIMCLK;
-	scctrl |= SCCTRL_TIMEREN1SEL_TIMCLK;
-	writel(scctrl, base + SCCTRL);
-}
-
 static void __init v2m_sp804_init(void __iomem *base, unsigned int irq)
 {
 	if (WARN_ON(!base || irq == NO_IRQ))
@@ -87,69 +69,6 @@ static void __init v2m_sp804_init(void __iomem *base, unsigned int irq)
 }
 
 
-static DEFINE_SPINLOCK(v2m_cfg_lock);
-
-int v2m_cfg_write(u32 devfn, u32 data)
-{
-	/* Configuration interface broken? */
-	u32 val;
-
-	printk("%s: writing %08x to %08x\n", __func__, data, devfn);
-
-	devfn |= SYS_CFG_START | SYS_CFG_WRITE;
-
-	spin_lock(&v2m_cfg_lock);
-	val = readl(v2m_sysreg_base + V2M_SYS_CFGSTAT);
-	writel(val & ~SYS_CFG_COMPLETE, v2m_sysreg_base + V2M_SYS_CFGSTAT);
-
-	writel(data, v2m_sysreg_base +  V2M_SYS_CFGDATA);
-	writel(devfn, v2m_sysreg_base + V2M_SYS_CFGCTRL);
-
-	do {
-		val = readl(v2m_sysreg_base + V2M_SYS_CFGSTAT);
-	} while (val == 0);
-	spin_unlock(&v2m_cfg_lock);
-
-	return !!(val & SYS_CFG_ERR);
-}
-
-int v2m_cfg_read(u32 devfn, u32 *data)
-{
-	u32 val;
-
-	devfn |= SYS_CFG_START;
-
-	spin_lock(&v2m_cfg_lock);
-	writel(0, v2m_sysreg_base + V2M_SYS_CFGSTAT);
-	writel(devfn, v2m_sysreg_base + V2M_SYS_CFGCTRL);
-
-	mb();
-
-	do {
-		cpu_relax();
-		val = readl(v2m_sysreg_base + V2M_SYS_CFGSTAT);
-	} while (val == 0);
-
-	*data = readl(v2m_sysreg_base + V2M_SYS_CFGDATA);
-	spin_unlock(&v2m_cfg_lock);
-
-	return !!(val & SYS_CFG_ERR);
-}
-
-void __init v2m_flags_set(u32 data)
-{
-	writel(~0, v2m_sysreg_base + V2M_SYS_FLAGSCLR);
-	writel(data, v2m_sysreg_base + V2M_SYS_FLAGSSET);
-}
-
-int v2m_get_master_site(void)
-{
-	u32 misc = readl(v2m_sysreg_base + V2M_SYS_MISC);
-
-	return misc & SYS_MISC_MASTERSITE ? SYS_CFG_SITE_DB2 : SYS_CFG_SITE_DB1;
-}
-
-
 static struct resource v2m_pcie_i2c_resource = {
 	.start	= V2M_SERIAL_BUS_PCI,
 	.end	= V2M_SERIAL_BUS_PCI + SZ_4K - 1,
@@ -237,14 +156,8 @@ static struct platform_device v2m_usb_device = {
 	.dev.platform_data = &v2m_usb_config,
 };
 
-static void v2m_flash_set_vpp(struct platform_device *pdev, int on)
-{
-	writel(on != 0, v2m_sysreg_base + V2M_SYS_FLASH);
-}
-
 static struct physmap_flash_data v2m_flash_data = {
 	.width		= 4,
-	.set_vpp	= v2m_flash_set_vpp,
 };
 
 static struct resource v2m_flash_resources[] = {
@@ -291,14 +204,61 @@ static struct platform_device v2m_cf_device = {
 	.dev.platform_data = &v2m_pata_data,
 };
 
-static unsigned int v2m_mmci_status(struct device *dev)
-{
-	return readl(v2m_sysreg_base + V2M_SYS_MCI) & (1 << 0);
-}
-
 static struct mmci_platform_data v2m_mmci_data = {
 	.ocr_mask	= MMC_VDD_32_33|MMC_VDD_33_34,
-	.status		= v2m_mmci_status,
+	.gpio_wp	= VEXPRESS_GPIO_MMC_WPROT,
+	.gpio_cd	= VEXPRESS_GPIO_MMC_CARDIN,
+};
+
+static struct resource v2m_sysreg_resources[] = {
+	{
+		.start	= V2M_SYSREGS,
+		.end	= V2M_SYSREGS + 0xfff,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+static struct platform_device v2m_sysreg_device = {
+	.name		= "vexpress-sysreg",
+	.id		= -1,
+	.resource	= v2m_sysreg_resources,
+	.num_resources	= ARRAY_SIZE(v2m_sysreg_resources),
+};
+
+static struct platform_device v2m_muxfpga_device = {
+	.name		= "vexpress-muxfpga",
+	.id		= 0,
+	.num_resources	= 1,
+	.resource	= (struct resource []) {
+		VEXPRESS_RES_FUNC(0, 7),
+	}
+};
+
+static struct platform_device v2m_shutdown_device = {
+	.name		= "vexpress-shutdown",
+	.id		= 0,
+	.num_resources	= 1,
+	.resource	= (struct resource []) {
+		VEXPRESS_RES_FUNC(0, 8),
+	}
+};
+
+static struct platform_device v2m_reboot_device = {
+	.name		= "vexpress-reboot",
+	.id		= 0,
+	.num_resources	= 1,
+	.resource	= (struct resource []) {
+		VEXPRESS_RES_FUNC(0, 9),
+	}
+};
+
+static struct platform_device v2m_dvimode_device = {
+	.name		= "vexpress-dvimode",
+	.id		= 0,
+	.num_resources	= 1,
+	.resource	= (struct resource []) {
+		VEXPRESS_RES_FUNC(0, 11),
+	}
 };
 
 static AMBA_APB_DEVICE(aaci,  "mb:aaci",  0, V2M_AACI, IRQ_V2M_AACI, NULL);
@@ -325,123 +285,9 @@ static struct amba_device *v2m_amba_devs[] __initdata = {
 	&rtc_device,
 };
 
-
-static unsigned long v2m_osc_recalc_rate(struct clk_hw *hw,
-		unsigned long parent_rate)
-{
-	struct v2m_osc *osc = to_v2m_osc(hw);
-
-	return !parent_rate ? osc->rate_default : parent_rate;
-}
-
-static long v2m_osc_round_rate(struct clk_hw *hw, unsigned long rate,
-		unsigned long *parent_rate)
-{
-	struct v2m_osc *osc = to_v2m_osc(hw);
-
-	if (WARN_ON(rate < osc->rate_min))
-		rate = osc->rate_min;
-
-	if (WARN_ON(rate > osc->rate_max))
-		rate = osc->rate_max;
-
-	return rate;
-}
-
-static int v2m_osc_set_rate(struct clk_hw *hw, unsigned long rate,
-		unsigned long parent_rate)
-{
-	struct v2m_osc *osc = to_v2m_osc(hw);
-
-	v2m_cfg_write(SYS_CFG_OSC | SYS_CFG_SITE(osc->site) |
-			SYS_CFG_STACK(osc->stack) | osc->osc, rate);
-
-	return 0;
-}
-
-static struct clk_ops v2m_osc_ops = {
-	.recalc_rate = v2m_osc_recalc_rate,
-	.round_rate = v2m_osc_round_rate,
-	.set_rate = v2m_osc_set_rate,
-};
-
-struct clk * __init v2m_osc_register(const char *name, struct v2m_osc *osc)
-{
-	struct clk_init_data init;
-
-	WARN_ON(osc->site > 2);
-	WARN_ON(osc->stack > 15);
-	WARN_ON(osc->osc > 4095);
-
-	init.name = name;
-	init.ops = &v2m_osc_ops;
-	init.flags = CLK_IS_ROOT;
-	init.num_parents = 0;
-
-	osc->hw.init = &init;
-
-	return clk_register(NULL, &osc->hw);
-}
-
-static struct v2m_osc v2m_mb_osc1 = {
-	.site = SYS_CFG_SITE_MB,
-	.osc = 1,
-	.rate_min = 23750000,
-	.rate_max = 63500000,
-	.rate_default = 23750000,
-};
-
-static const char *v2m_ref_clk_periphs[] __initconst = {
-	"mb:wdt",   "1000f000.wdt",  "1c0f0000.wdt",	/* SP805 WDT */
-};
-
-static const char *v2m_osc1_periphs[] __initconst = {
-	"mb:clcd",  "1001f000.clcd", "1c1f0000.clcd",	/* PL111 CLCD */
-};
-
-static const char *v2m_osc2_periphs[] __initconst = {
-	"mb:mmci",  "10005000.mmci", "1c050000.mmci",	/* PL180 MMCI */
-	"mb:kmi0",  "10006000.kmi",  "1c060000.kmi",	/* PL050 KMI0 */
-	"mb:kmi1",  "10007000.kmi",  "1c070000.kmi",	/* PL050 KMI1 */
-	"mb:uart0", "10009000.uart", "1c090000.uart",	/* PL011 UART0 */
-	"mb:uart1", "1000a000.uart", "1c0a0000.uart",	/* PL011 UART1 */
-	"mb:uart2", "1000b000.uart", "1c0b0000.uart",	/* PL011 UART2 */
-	"mb:uart3", "1000c000.uart", "1c0c0000.uart",	/* PL011 UART3 */
-};
-
-static void __init v2m_clk_init(void)
-{
-	struct clk *clk;
-	int i;
-
-	clk = clk_register_fixed_rate(NULL, "dummy_apb_pclk", NULL,
-			CLK_IS_ROOT, 0);
-	WARN_ON(clk_register_clkdev(clk, "apb_pclk", NULL));
-
-	clk = clk_register_fixed_rate(NULL, "mb:ref_clk", NULL,
-			CLK_IS_ROOT, 32768);
-	for (i = 0; i < ARRAY_SIZE(v2m_ref_clk_periphs); i++)
-		WARN_ON(clk_register_clkdev(clk, NULL, v2m_ref_clk_periphs[i]));
-
-	clk = clk_register_fixed_rate(NULL, "mb:sp804_clk", NULL,
-			CLK_IS_ROOT, 1000000);
-	WARN_ON(clk_register_clkdev(clk, "v2m-timer0", "sp804"));
-	WARN_ON(clk_register_clkdev(clk, "v2m-timer1", "sp804"));
-
-	clk = v2m_osc_register("mb:osc1", &v2m_mb_osc1);
-	for (i = 0; i < ARRAY_SIZE(v2m_osc1_periphs); i++)
-		WARN_ON(clk_register_clkdev(clk, NULL, v2m_osc1_periphs[i]));
-
-	clk = clk_register_fixed_rate(NULL, "mb:osc2", NULL,
-			CLK_IS_ROOT, 24000000);
-	for (i = 0; i < ARRAY_SIZE(v2m_osc2_periphs); i++)
-		WARN_ON(clk_register_clkdev(clk, NULL, v2m_osc2_periphs[i]));
-}
-
 static void __init v2m_timer_init(void)
 {
-	v2m_sysctl_init(ioremap(V2M_SYSCTL, SZ_4K));
-	v2m_clk_init();
+	vexpress_clk_init(ioremap(V2M_SYSCTL, SZ_4K));
 	v2m_sp804_init(ioremap(V2M_TIMER01, SZ_4K), IRQ_V2M_TIMER0);
 }
 
@@ -453,19 +299,7 @@ static void __init v2m_init_early(void)
 {
 	if (ct_desc->init_early)
 		ct_desc->init_early();
-	versatile_sched_clock_init(v2m_sysreg_base + V2M_SYS_24MHZ, 24000000);
-}
-
-static void v2m_power_off(void)
-{
-	if (v2m_cfg_write(SYS_CFG_SHUTDOWN | SYS_CFG_SITE(SYS_CFG_SITE_MB), 0))
-		printk(KERN_EMERG "Unable to shutdown\n");
-}
-
-static void v2m_restart(char str, const char *cmd)
-{
-	if (v2m_cfg_write(SYS_CFG_REBOOT | SYS_CFG_SITE(SYS_CFG_SITE_MB), 0))
-		printk(KERN_EMERG "Unable to reboot\n");
+	versatile_sched_clock_init(vexpress_get_24mhz_clock_base(), 24000000);
 }
 
 struct ct_desc *ct_desc;
@@ -482,7 +316,7 @@ static void __init v2m_populate_ct_desc(void)
 	u32 current_tile_id;
 
 	ct_desc = NULL;
-	current_tile_id = readl(v2m_sysreg_base + V2M_SYS_PROCID0)
+	current_tile_id = vexpress_get_procid(VEXPRESS_SITE_MASTER)
 				& V2M_CT_ID_MASK;
 
 	for (i = 0; i < ARRAY_SIZE(ct_descs) && !ct_desc; ++i)
@@ -498,7 +332,7 @@ static void __init v2m_populate_ct_desc(void)
 static void __init v2m_map_io(void)
 {
 	iotable_init(v2m_io_desc, ARRAY_SIZE(v2m_io_desc));
-	v2m_sysreg_base = ioremap(V2M_SYSREGS, SZ_4K);
+	vexpress_sysreg_early_init(ioremap(V2M_SYSREGS, SZ_4K));
 	v2m_populate_ct_desc();
 	ct_desc->map_io();
 }
@@ -515,6 +349,12 @@ static void __init v2m_init(void)
 	regulator_register_fixed(0, v2m_eth_supplies,
 			ARRAY_SIZE(v2m_eth_supplies));
 
+	platform_device_register(&v2m_muxfpga_device);
+	platform_device_register(&v2m_shutdown_device);
+	platform_device_register(&v2m_reboot_device);
+	platform_device_register(&v2m_dvimode_device);
+
+	platform_device_register(&v2m_sysreg_device);
 	platform_device_register(&v2m_pcie_i2c_device);
 	platform_device_register(&v2m_ddc_i2c_device);
 	platform_device_register(&v2m_flash_device);
@@ -525,7 +365,7 @@ static void __init v2m_init(void)
 	for (i = 0; i < ARRAY_SIZE(v2m_amba_devs); i++)
 		amba_device_register(v2m_amba_devs[i], &iomem_resource);
 
-	pm_power_off = v2m_power_off;
+	pm_power_off = vexpress_power_off;
 
 	ct_desc->init_tile();
 }
@@ -539,7 +379,7 @@ MACHINE_START(VEXPRESS, "ARM-Versatile Express")
 	.timer		= &v2m_timer,
 	.handle_irq	= gic_handle_irq,
 	.init_machine	= v2m_init,
-	.restart	= v2m_restart,
+	.restart	= vexpress_restart,
 MACHINE_END
 
 static struct map_desc v2m_rs1_io_desc __initdata = {
@@ -580,20 +420,13 @@ void __init v2m_dt_map_io(void)
 
 void __init v2m_dt_init_early(void)
 {
-	struct device_node *node;
 	u32 dt_hbi;
 
-	node = of_find_compatible_node(NULL, NULL, "arm,vexpress-sysreg");
-	v2m_sysreg_base = of_iomap(node, 0);
-	if (WARN_ON(!v2m_sysreg_base))
-		return;
+	vexpress_sysreg_of_early_init();
 
 	/* Confirm board type against DT property, if available */
 	if (of_property_read_u32(allnodes, "arm,hbi", &dt_hbi) == 0) {
-		int site = v2m_get_master_site();
-		u32 id = readl(v2m_sysreg_base + (site == SYS_CFG_SITE_DB2 ?
-				V2M_SYS_PROCID1 : V2M_SYS_PROCID0));
-		u32 hbi = id & SYS_PROCIDx_HBI_MASK;
+		u32 hbi = vexpress_get_hbi(VEXPRESS_SITE_MASTER);
 
 		if (WARN_ON(dt_hbi != hbi))
 			pr_warning("vexpress: DT HBI (%x) is not matching "
@@ -617,10 +450,7 @@ static void __init v2m_dt_timer_init(void)
 	const char *path;
 	int err;
 
-	node = of_find_compatible_node(NULL, NULL, "arm,sp810");
-	v2m_sysctl_init(of_iomap(node, 0));
-
-	v2m_clk_init();
+	vexpress_clk_of_init();
 
 	err = of_property_read_string(of_aliases, "arm,v2m_timer", &path);
 	if (WARN_ON(err))
@@ -631,33 +461,29 @@ static void __init v2m_dt_timer_init(void)
 		twd_local_timer_of_register();
 
 	if (arch_timer_sched_clock_init() != 0)
-		versatile_sched_clock_init(v2m_sysreg_base + V2M_SYS_24MHZ, 24000000);
+		versatile_sched_clock_init(vexpress_get_24mhz_clock_base(),
+				24000000);
 }
 
 static struct sys_timer v2m_dt_timer = {
 	.init = v2m_dt_timer_init,
 };
 
-static struct of_dev_auxdata v2m_dt_auxdata_lookup[] __initdata = {
-	OF_DEV_AUXDATA("arm,vexpress-flash", V2M_NOR0, "physmap-flash",
-			&v2m_flash_data),
-	OF_DEV_AUXDATA("arm,primecell", V2M_MMCI, "mb:mmci", &v2m_mmci_data),
-	/* RS1 memory map */
-	OF_DEV_AUXDATA("arm,vexpress-flash", 0x08000000, "physmap-flash",
-			&v2m_flash_data),
-	OF_DEV_AUXDATA("arm,primecell", 0x1c050000, "mb:mmci", &v2m_mmci_data),
+static const struct of_device_id v2m_dt_bus_match[] __initconst = {
+	{ .compatible = "simple-bus", },
+	{ .compatible = "arm,amba-bus", },
+	{ .compatible = "arm,vexpress,config-bus", },
 	{}
 };
 
 static void __init v2m_dt_init(void)
 {
 	l2x0_of_init(0x00400000, 0xfe0fffff);
-	of_platform_populate(NULL, of_default_bus_match_table,
-			v2m_dt_auxdata_lookup, NULL);
-	pm_power_off = v2m_power_off;
+	of_platform_populate(NULL, v2m_dt_bus_match, NULL, NULL);
+	pm_power_off = vexpress_power_off;
 }
 
-const static char *v2m_dt_match[] __initconst = {
+static const char * const v2m_dt_match[] __initconst = {
 	"arm,vexpress",
 	"xen,xenvm",
 	NULL,
@@ -672,5 +498,5 @@ DT_MACHINE_START(VEXPRESS_DT, "ARM-Versatile Express")
 	.timer		= &v2m_dt_timer,
 	.init_machine	= v2m_dt_init,
 	.handle_irq	= gic_handle_irq,
-	.restart	= v2m_restart,
+	.restart	= vexpress_restart,
 MACHINE_END