ARM: integrator: push down SC dependencies

This pushes the dependencies on the Integrator/AP system
controller (SC) down into the PCI V3 driver and the
AP-specific board file.

First, the platform data for the PL010 UART is moved into
the integrator_ap.c board file, and the Integrator/CP is
assigned with NULL pdata. This way the callback functions
can reference the dynamically remapped AP syscon address
in both the ATAG and DT boot path, and this remapping
is localized to the board file.

Second the PCIv3 driver is making its own dynamic remapping
of the SC for the few registers it is using. When we
convert the PCIv3 driver over to using device tree having a
dynamically assigned base address will be useful, but we
will have to use the definition from <mach/platform.h> for
now, the only improvement is that it's done dynamically.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/mach-integrator/common.h

@@ -1,5 +1,10 @@
 #include <linux/amba/serial.h>
-extern struct amba_pl010_data integrator_uart_data;
+#ifdef CONFIG_ARCH_INTEGRATOR_AP
+extern struct amba_pl010_data ap_uart_data;
+#else
+/* Not used without Integrator/AP support anyway */
+struct amba_pl010_data ap_uart_data {};
+#endif
 void integrator_init_early(void);
 int integrator_init(bool is_cp);
 void integrator_reserve(void);

arch/arm/mach-integrator/core.c

@@ -18,7 +18,6 @@
 #include <linux/memblock.h>
 #include <linux/sched.h>
 #include <linux/smp.h>
-#include <linux/termios.h>
 #include <linux/amba/bus.h>
 #include <linux/amba/serial.h>
 #include <linux/io.h>
@@ -47,10 +46,10 @@ static AMBA_APB_DEVICE(rtc, "rtc", 0,
 	INTEGRATOR_RTC_BASE, INTEGRATOR_RTC_IRQ, NULL);
 
 static AMBA_APB_DEVICE(uart0, "uart0", 0,
-	INTEGRATOR_UART0_BASE, INTEGRATOR_UART0_IRQ, &integrator_uart_data);
+	INTEGRATOR_UART0_BASE, INTEGRATOR_UART0_IRQ, NULL);
 
 static AMBA_APB_DEVICE(uart1, "uart1", 0,
-	INTEGRATOR_UART1_BASE, INTEGRATOR_UART1_IRQ, &integrator_uart_data);
+	INTEGRATOR_UART1_BASE, INTEGRATOR_UART1_IRQ, NULL);
 
 static AMBA_APB_DEVICE(kmi0, "kmi0", 0, KMI0_BASE, KMI0_IRQ, NULL);
 static AMBA_APB_DEVICE(kmi1, "kmi1", 0, KMI1_BASE, KMI1_IRQ, NULL);
@@ -78,6 +77,8 @@ int __init integrator_init(bool is_cp)
 		uart1_device.periphid	= 0x00041010;
 		kmi0_device.periphid	= 0x00041050;
 		kmi1_device.periphid	= 0x00041050;
+		uart0_device.dev.platform_data = &ap_uart_data;
+		uart1_device.dev.platform_data = &ap_uart_data;
 	}
 
 	for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
@@ -90,49 +91,6 @@ int __init integrator_init(bool is_cp)
 
 #endif
 
-/*
- * On the Integrator platform, the port RTS and DTR are provided by
- * bits in the following SC_CTRLS register bits:
- *        RTS  DTR
- *  UART0  7    6
- *  UART1  5    4
- */
-#define SC_CTRLC	__io_address(INTEGRATOR_SC_CTRLC)
-#define SC_CTRLS	__io_address(INTEGRATOR_SC_CTRLS)
-
-static void integrator_uart_set_mctrl(struct amba_device *dev, void __iomem *base, unsigned int mctrl)
-{
-	unsigned int ctrls = 0, ctrlc = 0, rts_mask, dtr_mask;
-	u32 phybase = dev->res.start;
-
-	if (phybase == INTEGRATOR_UART0_BASE) {
-		/* UART0 */
-		rts_mask = 1 << 4;
-		dtr_mask = 1 << 5;
-	} else {
-		/* UART1 */
-		rts_mask = 1 << 6;
-		dtr_mask = 1 << 7;
-	}
-
-	if (mctrl & TIOCM_RTS)
-		ctrlc |= rts_mask;
-	else
-		ctrls |= rts_mask;
-
-	if (mctrl & TIOCM_DTR)
-		ctrlc |= dtr_mask;
-	else
-		ctrls |= dtr_mask;
-
-	__raw_writel(ctrls, SC_CTRLS);
-	__raw_writel(ctrlc, SC_CTRLC);
-}
-
-struct amba_pl010_data integrator_uart_data = {
-	.set_mctrl = integrator_uart_set_mctrl,
-};
-
 static DEFINE_RAW_SPINLOCK(cm_lock);
 
 /**

arch/arm/mach-integrator/include/mach/platform.h

@@ -190,7 +190,6 @@
 #define INTEGRATOR_SC_CTRLC_OFFSET      0x0C
 #define INTEGRATOR_SC_DEC_OFFSET        0x10
 #define INTEGRATOR_SC_ARB_OFFSET        0x14
-#define INTEGRATOR_SC_PCIENABLE_OFFSET  0x18
 #define INTEGRATOR_SC_LOCK_OFFSET       0x1C
 
 #define INTEGRATOR_SC_BASE              0x11000000

arch/arm/mach-integrator/integrator_ap.c

@@ -39,6 +39,7 @@
 #include <linux/of_platform.h>
 #include <linux/stat.h>
 #include <linux/sys_soc.h>
+#include <linux/termios.h>
 #include <video/vga.h>
 
 #include <mach/hardware.h>
@@ -63,7 +64,7 @@
 #include "common.h"
 
 /* Base address to the AP system controller */
-static void __iomem *ap_syscon_base;
+void __iomem *ap_syscon_base;
 
 /*
  * All IO addresses are mapped onto VA 0xFFFx.xxxx, where x.xxxx
@@ -250,6 +251,45 @@ static struct physmap_flash_data ap_flash_data = {
 	.set_vpp	= ap_flash_set_vpp,
 };
 
+/*
+ * For the PL010 found in the Integrator/AP some of the UART control is
+ * implemented in the system controller and accessed using a callback
+ * from the driver.
+ */
+static void integrator_uart_set_mctrl(struct amba_device *dev,
+				void __iomem *base, unsigned int mctrl)
+{
+	unsigned int ctrls = 0, ctrlc = 0, rts_mask, dtr_mask;
+	u32 phybase = dev->res.start;
+
+	if (phybase == INTEGRATOR_UART0_BASE) {
+		/* UART0 */
+		rts_mask = 1 << 4;
+		dtr_mask = 1 << 5;
+	} else {
+		/* UART1 */
+		rts_mask = 1 << 6;
+		dtr_mask = 1 << 7;
+	}
+
+	if (mctrl & TIOCM_RTS)
+		ctrlc |= rts_mask;
+	else
+		ctrls |= rts_mask;
+
+	if (mctrl & TIOCM_DTR)
+		ctrlc |= dtr_mask;
+	else
+		ctrls |= dtr_mask;
+
+	__raw_writel(ctrls, ap_syscon_base + INTEGRATOR_SC_CTRLS_OFFSET);
+	__raw_writel(ctrlc, ap_syscon_base + INTEGRATOR_SC_CTRLC_OFFSET);
+}
+
+struct amba_pl010_data ap_uart_data = {
+	.set_mctrl = integrator_uart_set_mctrl,
+};
+
 /*
  * Where is the timer (VA)?
  */
@@ -447,9 +487,9 @@ static struct of_dev_auxdata ap_auxdata_lookup[] __initdata = {
 	OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_RTC_BASE,
 		"rtc", NULL),
 	OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART0_BASE,
-		"uart0", &integrator_uart_data),
+		"uart0", &ap_uart_data),
 	OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART1_BASE,
-		"uart1", &integrator_uart_data),
+		"uart1", &ap_uart_data),
 	OF_DEV_AUXDATA("arm,primecell", KMI0_BASE,
 		"kmi0", NULL),
 	OF_DEV_AUXDATA("arm,primecell", KMI1_BASE,

arch/arm/mach-integrator/integrator_cp.c

@@ -306,9 +306,9 @@ static struct of_dev_auxdata intcp_auxdata_lookup[] __initdata = {
 	OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_RTC_BASE,
 		"rtc", NULL),
 	OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART0_BASE,
-		"uart0", &integrator_uart_data),
+		"uart0", NULL),
 	OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART1_BASE,
-		"uart1", &integrator_uart_data),
+		"uart1", NULL),
 	OF_DEV_AUXDATA("arm,primecell", KMI0_BASE,
 		"kmi0", NULL),
 	OF_DEV_AUXDATA("arm,primecell", KMI1_BASE,

arch/arm/mach-integrator/pci_v3.c

@@ -388,9 +388,10 @@ static int __init pci_v3_setup_resources(struct pci_sys_data *sys)
  * means I can't get additional information on the reason for the pm2fb
  * problems.  I suppose I'll just have to mind-meld with the machine. ;)
  */
-#define SC_PCI     __io_address(INTEGRATOR_SC_PCIENABLE)
-#define SC_LBFADDR __io_address(INTEGRATOR_SC_BASE + 0x20)
-#define SC_LBFCODE __io_address(INTEGRATOR_SC_BASE + 0x24)
+static void __iomem *ap_syscon_base;
+#define INTEGRATOR_SC_PCIENABLE_OFFSET	0x18
+#define INTEGRATOR_SC_LBFADDR_OFFSET	0x20
+#define INTEGRATOR_SC_LBFCODE_OFFSET	0x24
 
 static int
 v3_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
@@ -401,13 +402,13 @@ v3_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 	char buf[128];
 
 	sprintf(buf, "V3 fault: addr 0x%08lx, FSR 0x%03x, PC 0x%08lx [%08lx] LBFADDR=%08x LBFCODE=%02x ISTAT=%02x\n",
-		addr, fsr, pc, instr, __raw_readl(SC_LBFADDR), __raw_readl(SC_LBFCODE) & 255,
+		addr, fsr, pc, instr, __raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFADDR_OFFSET), __raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFCODE_OFFSET) & 255,
 		v3_readb(V3_LB_ISTAT));
 	printk(KERN_DEBUG "%s", buf);
 #endif
 
 	v3_writeb(V3_LB_ISTAT, 0);
-	__raw_writel(3, SC_PCI);
+	__raw_writel(3, ap_syscon_base + INTEGRATOR_SC_PCIENABLE_OFFSET);
 
 	/*
 	 * If the instruction being executed was a read,
@@ -449,15 +450,15 @@ static irqreturn_t v3_irq(int dummy, void *devid)
 
 	sprintf(buf, "V3 int %d: pc=0x%08lx [%08lx] LBFADDR=%08x LBFCODE=%02x "
 		"ISTAT=%02x\n", IRQ_AP_V3INT, pc, instr,
-		__raw_readl(SC_LBFADDR),
-		__raw_readl(SC_LBFCODE) & 255,
+		__raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFADDR_OFFSET),
+		__raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFCODE_OFFSET) & 255,
 		v3_readb(V3_LB_ISTAT));
 	printascii(buf);
 #endif
 
 	v3_writew(V3_PCI_STAT, 0xf000);
 	v3_writeb(V3_LB_ISTAT, 0);
-	__raw_writel(3, SC_PCI);
+	__raw_writel(3, ap_syscon_base + INTEGRATOR_SC_PCIENABLE_OFFSET);
 
 #ifdef CONFIG_DEBUG_LL
 	/*
@@ -480,6 +481,10 @@ int __init pci_v3_setup(int nr, struct pci_sys_data *sys)
 	if (nr == 0) {
 		sys->mem_offset = PHYS_PCI_MEM_BASE;
 		ret = pci_v3_setup_resources(sys);
+		/* Remap the Integrator system controller */
+		ap_syscon_base = ioremap(INTEGRATOR_SC_BASE, 0x100);
+		if (!ap_syscon_base)
+			return -EINVAL;
 	}
 
 	return ret;
@@ -568,7 +573,7 @@ void __init pci_v3_preinit(void)
 	v3_writeb(V3_LB_ISTAT, 0);
 	v3_writew(V3_LB_CFG, v3_readw(V3_LB_CFG) | (1 << 10));
 	v3_writeb(V3_LB_IMASK, 0x28);
-	__raw_writel(3, SC_PCI);
+	__raw_writel(3, ap_syscon_base + INTEGRATOR_SC_PCIENABLE_OFFSET);
 
 	/*
 	 * Grab the PCI error interrupt.