atheros: v3.18: remap PCI controller MMR memory

Honestly remap PCI controller MMR and use accessor functions to interact
with registers.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>

SVN-Revision: 44720

2 files changed, 88 insertions, 50 deletions

diff --git a/target/linux/atheros/patches-3.18/100-board.patch b/target/linux/atheros/patches-3.18/100-board.patch
index e90cd633b6..b6b37d1bbd 100644
--- a/target/linux/atheros/patches-3.18/100-board.patch
+++ b/target/linux/atheros/patches-3.18/100-board.patch
@@ -629,7 +629,7 @@
 +#endif /* __ASM_MACH_ATH25_WAR_H */
 --- /dev/null
 +++ b/arch/mips/include/asm/mach-ath25/ar2315_regs.h
-@@ -0,0 +1,510 @@
+@@ -0,0 +1,511 @@
 +/*
 + * Register definitions for AR2315+
 + *
@@ -675,6 +675,7 @@
 +#define AR2315_SPI_READ         0x08000000      /* SPI FLASH */
 +#define AR2315_WLAN0            0x10000000      /* Wireless MMR */
 +#define AR2315_PCI              0x10100000      /* PCI MMR */
++#define AR2315_PCI_SIZE		0x00001000
 +#define AR2315_SDRAMCTL         0x10300000      /* SDRAM MMR */
 +#define AR2315_LOCAL            0x10400000      /* LOCAL BUS MMR */
 +#define AR2315_ENET0            0x10500000      /* ETHERNET MMR */
diff --git a/target/linux/atheros/patches-3.18/105-ar2315_pci.patch b/target/linux/atheros/patches-3.18/105-ar2315_pci.patch
index 02074ddf76..904e60fe54 100644
--- a/target/linux/atheros/patches-3.18/105-ar2315_pci.patch
+++ b/target/linux/atheros/patches-3.18/105-ar2315_pci.patch
@@ -10,7 +10,7 @@
  obj-$(CONFIG_MIPS_PCI_VIRTIO)	+= pci-virtio-guest.o
 --- /dev/null
 +++ b/arch/mips/pci/pci-ar2315.c
-@@ -0,0 +1,445 @@
+@@ -0,0 +1,482 @@
 +/*
 + * This program is free software; you can redistribute it and/or
 + * modify it under the terms of the GNU General Public License
@@ -67,11 +67,11 @@
 +/*
 + * PCI Bus Interface Registers
 + */
-+#define AR2315_PCI_1MS_REG		(AR2315_PCI + 0x0008)
++#define AR2315_PCI_1MS_REG		0x0008
 +
 +#define AR2315_PCI_1MS_MASK		0x3FFFF	/* # of AHB clk cycles in 1ms */
 +
-+#define AR2315_PCI_MISC_CONFIG		(AR2315_PCI + 0x000c)
++#define AR2315_PCI_MISC_CONFIG		0x000c
 +
 +#define AR2315_PCIMISC_TXD_EN	0x00000001	/* Enable TXD for fragments */
 +#define AR2315_PCIMISC_CFG_SEL	0x00000002	/* Mem or Config cycles */
@@ -87,38 +87,38 @@
 +#define AR2315_PCICACHE_DIS	0x00001000	/* PCI external access cache
 +						 * disable */
 +
-+#define AR2315_PCI_OUT_TSTAMP		(AR2315_PCI + 0x0010)
++#define AR2315_PCI_OUT_TSTAMP		0x0010
 +
-+#define AR2315_PCI_UNCACHE_CFG		(AR2315_PCI + 0x0014)
++#define AR2315_PCI_UNCACHE_CFG		0x0014
 +
-+#define AR2315_PCI_IN_EN		(AR2315_PCI + 0x0100)
++#define AR2315_PCI_IN_EN		0x0100
 +
 +#define AR2315_PCI_IN_EN0	0x01	/* Enable chain 0 */
 +#define AR2315_PCI_IN_EN1	0x02	/* Enable chain 1 */
 +#define AR2315_PCI_IN_EN2	0x04	/* Enable chain 2 */
 +#define AR2315_PCI_IN_EN3	0x08	/* Enable chain 3 */
 +
-+#define AR2315_PCI_IN_DIS		(AR2315_PCI + 0x0104)
++#define AR2315_PCI_IN_DIS		0x0104
 +
 +#define AR2315_PCI_IN_DIS0	0x01	/* Disable chain 0 */
 +#define AR2315_PCI_IN_DIS1	0x02	/* Disable chain 1 */
 +#define AR2315_PCI_IN_DIS2	0x04	/* Disable chain 2 */
 +#define AR2315_PCI_IN_DIS3	0x08	/* Disable chain 3 */
 +
-+#define AR2315_PCI_IN_PTR		(AR2315_PCI + 0x0200)
++#define AR2315_PCI_IN_PTR		0x0200
 +
-+#define AR2315_PCI_OUT_EN		(AR2315_PCI + 0x0400)
++#define AR2315_PCI_OUT_EN		0x0400
 +
 +#define AR2315_PCI_OUT_EN0	0x01	/* Enable chain 0 */
 +
-+#define AR2315_PCI_OUT_DIS		(AR2315_PCI + 0x0404)
++#define AR2315_PCI_OUT_DIS		0x0404
 +
 +#define AR2315_PCI_OUT_DIS0	0x01	/* Disable chain 0 */
 +
-+#define AR2315_PCI_OUT_PTR		(AR2315_PCI + 0x0408)
++#define AR2315_PCI_OUT_PTR		0x0408
 +
 +/* PCI interrupt status (write one to clear) */
-+#define AR2315_PCI_ISR			(AR2315_PCI + 0x0500)
++#define AR2315_PCI_ISR			0x0500
 +
 +#define AR2315_PCI_INT_TX	0x00000001	/* Desc In Completed */
 +#define AR2315_PCI_INT_TXOK	0x00000002	/* Desc In OK */
@@ -134,20 +134,20 @@
 +#define AR2315_PCI_INT_ABORT	0x04000000	/* PCI bus abort event */
 +
 +/* PCI interrupt mask */
-+#define AR2315_PCI_IMR			(AR2315_PCI + 0x0504)
++#define AR2315_PCI_IMR			0x0504
 +
 +/* Global PCI interrupt enable */
-+#define AR2315_PCI_IER			(AR2315_PCI + 0x0508)
++#define AR2315_PCI_IER			0x0508
 +
 +#define AR2315_PCI_IER_DISABLE		0x00	/* disable pci interrupts */
 +#define AR2315_PCI_IER_ENABLE		0x01	/* enable pci interrupts */
 +
-+#define AR2315_PCI_HOST_IN_EN		(AR2315_PCI + 0x0800)
-+#define AR2315_PCI_HOST_IN_DIS		(AR2315_PCI + 0x0804)
-+#define AR2315_PCI_HOST_IN_PTR		(AR2315_PCI + 0x0810)
-+#define AR2315_PCI_HOST_OUT_EN		(AR2315_PCI + 0x0900)
-+#define AR2315_PCI_HOST_OUT_DIS		(AR2315_PCI + 0x0904)
-+#define AR2315_PCI_HOST_OUT_PTR		(AR2315_PCI + 0x0908)
++#define AR2315_PCI_HOST_IN_EN		0x0800
++#define AR2315_PCI_HOST_IN_DIS		0x0804
++#define AR2315_PCI_HOST_IN_PTR		0x0810
++#define AR2315_PCI_HOST_OUT_EN		0x0900
++#define AR2315_PCI_HOST_OUT_DIS		0x0904
++#define AR2315_PCI_HOST_OUT_PTR		0x0908
 +
 +/*
 + * PCI interrupts, which share IP5
@@ -174,6 +174,7 @@
 +
 +struct ar2315_pci_ctrl {
 +	void __iomem *cfg_mem;
++	void __iomem *mmr_mem;
 +	struct pci_controller pci_ctrl;
 +	struct resource mem_res;
 +	struct resource io_res;
@@ -186,6 +187,27 @@
 +	return container_of(hose, struct ar2315_pci_ctrl, pci_ctrl);
 +}
 +
++static inline u32 ar2315_pci_reg_read(struct ar2315_pci_ctrl *apc, u32 reg)
++{
++	return __raw_readl(apc->mmr_mem + reg);
++}
++
++static inline void ar2315_pci_reg_write(struct ar2315_pci_ctrl *apc, u32 reg,
++					u32 val)
++{
++	__raw_writel(val, apc->mmr_mem + reg);
++}
++
++static inline void ar2315_pci_reg_mask(struct ar2315_pci_ctrl *apc, u32 reg,
++				       u32 mask, u32 val)
++{
++	u32 ret = ar2315_pci_reg_read(apc, reg);
++
++	ret &= ~mask;
++	ret |= val;
++	ar2315_pci_reg_write(apc, reg, ret);
++}
++
 +static int ar2315_pci_cfg_access(struct ar2315_pci_ctrl *apc, unsigned devfn,
 +				 int where, int size, u32 *ptr, bool write)
 +{
@@ -201,22 +223,24 @@
 +		return PCIBIOS_DEVICE_NOT_FOUND;
 +
 +	/* Clear pending errors */
-+	ar231x_write_reg(AR2315_PCI_ISR, AR2315_PCI_INT_ABORT);
++	ar2315_pci_reg_write(apc, AR2315_PCI_ISR, AR2315_PCI_INT_ABORT);
 +	/* Select Configuration access */
-+	ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, 0, AR2315_PCIMISC_CFG_SEL);
++	ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG, 0,
++			    AR2315_PCIMISC_CFG_SEL);
 +
 +	mb();	/* PCI must see space change before we begin */
 +
 +	value = __raw_readl(apc->cfg_mem + addr);
 +
-+	isr = ar231x_read_reg(AR2315_PCI_ISR);
++	isr = ar2315_pci_reg_read(apc, AR2315_PCI_ISR);
++
 +	if (isr & AR2315_PCI_INT_ABORT)
 +		goto exit_err;
 +
 +	if (write) {
 +		value = (value & ~(mask << sh)) | *ptr << sh;
 +		__raw_writel(value, apc->cfg_mem + addr);
-+		isr = ar231x_read_reg(AR2315_PCI_ISR);
++		isr = ar2315_pci_reg_read(apc, AR2315_PCI_ISR);
 +		if (isr & AR2315_PCI_INT_ABORT)
 +			goto exit_err;
 +	} else {
@@ -226,13 +250,14 @@
 +	goto exit;
 +
 +exit_err:
-+	ar231x_write_reg(AR2315_PCI_ISR, AR2315_PCI_INT_ABORT);
++	ar2315_pci_reg_write(apc, AR2315_PCI_ISR, AR2315_PCI_INT_ABORT);
 +	if (!write)
 +		*ptr = 0xffffffff;
 +
 +exit:
 +	/* Select Memory access */
-+	ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_CFG_SEL, 0);
++	ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_CFG_SEL,
++			    0);
 +
 +	return isr & AR2315_PCI_INT_ABORT ? PCIBIOS_DEVICE_NOT_FOUND :
 +					    PCIBIOS_SUCCESSFUL;
@@ -308,8 +333,9 @@
 +
 +static void ar2315_pci_irq_handler(unsigned irq, struct irq_desc *desc)
 +{
-+	u32 pending = ar231x_read_reg(AR2315_PCI_ISR) &
-+		      ar231x_read_reg(AR2315_PCI_IMR);
++	struct ar2315_pci_ctrl *apc = irq_get_handler_data(irq);
++	u32 pending = ar2315_pci_reg_read(apc, AR2315_PCI_ISR) &
++		      ar2315_pci_reg_read(apc, AR2315_PCI_IMR);
 +
 +	if (pending & AR2315_PCI_INT_EXT)
 +		generic_handle_irq(AR2315_PCI_IRQ_EXT);
@@ -321,24 +347,27 @@
 +
 +static void ar2315_pci_irq_mask(struct irq_data *d)
 +{
++	struct ar2315_pci_ctrl *apc = irq_data_get_irq_chip_data(d);
 +	u32 m = 1 << (d->irq - AR2315_PCI_IRQ_BASE + AR2315_PCI_IRQ_SHIFT);
 +
-+	ar231x_mask_reg(AR2315_PCI_IMR, m, 0);
++	ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, m, 0);
 +}
 +
 +static void ar2315_pci_irq_mask_ack(struct irq_data *d)
 +{
++	struct ar2315_pci_ctrl *apc = irq_data_get_irq_chip_data(d);
 +	u32 m = 1 << (d->irq - AR2315_PCI_IRQ_BASE + AR2315_PCI_IRQ_SHIFT);
 +
-+	ar231x_mask_reg(AR2315_PCI_IMR, m, 0);
-+	ar231x_write_reg(AR2315_PCI_ISR, m);
++	ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, m, 0);
++	ar2315_pci_reg_write(apc, AR2315_PCI_ISR, m);
 +}
 +
 +static void ar2315_pci_irq_unmask(struct irq_data *d)
 +{
++	struct ar2315_pci_ctrl *apc = irq_data_get_irq_chip_data(d);
 +	u32 m = 1 << (d->irq - AR2315_PCI_IRQ_BASE + AR2315_PCI_IRQ_SHIFT);
 +
-+	ar231x_mask_reg(AR2315_PCI_IMR, 0, m);
++	ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, 0, m);
 +}
 +
 +static struct irq_chip ar2315_pci_irq_chip = {
@@ -348,28 +377,30 @@
 +	.irq_unmask = ar2315_pci_irq_unmask,
 +};
 +
-+static void ar2315_pci_irq_init(void)
++static void ar2315_pci_irq_init(struct ar2315_pci_ctrl *apc)
 +{
 +	int i;
 +
-+	ar231x_mask_reg(AR2315_PCI_IER, AR2315_PCI_IER_ENABLE, 0);
-+	ar231x_mask_reg(AR2315_PCI_IMR, (AR2315_PCI_INT_ABORT |
-+			 AR2315_PCI_INT_EXT), 0);
++	ar2315_pci_reg_mask(apc, AR2315_PCI_IER, AR2315_PCI_IER_ENABLE, 0);
++	ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, (AR2315_PCI_INT_ABORT |
++			    AR2315_PCI_INT_EXT), 0);
 +
 +	for (i = 0; i < AR2315_PCI_IRQ_COUNT; ++i) {
 +		int irq = AR2315_PCI_IRQ_BASE + i;
 +
 +		irq_set_chip_and_handler(irq, &ar2315_pci_irq_chip,
 +					 handle_level_irq);
++		irq_set_chip_data(irq, apc);
 +	}
 +
 +	irq_set_chained_handler(AR2315_IRQ_LCBUS_PCI, ar2315_pci_irq_handler);
++	irq_set_handler_data(AR2315_IRQ_LCBUS_PCI, apc);
 +
 +	/* Clear any pending Abort or external Interrupts
 +	 * and enable interrupt processing */
-+	ar231x_write_reg(AR2315_PCI_ISR, (AR2315_PCI_INT_ABORT |
-+			 AR2315_PCI_INT_EXT));
-+	ar231x_mask_reg(AR2315_PCI_IER, 0, AR2315_PCI_IER_ENABLE);
++	ar2315_pci_reg_write(apc, AR2315_PCI_ISR, AR2315_PCI_INT_ABORT |
++						  AR2315_PCI_INT_EXT);
++	ar2315_pci_reg_mask(apc, AR2315_PCI_IER, 0, AR2315_PCI_IER_ENABLE);
 +}
 +
 +static int ar2315_pci_probe(struct platform_device *pdev)
@@ -382,6 +413,10 @@
 +	if (!apc)
 +		return -ENOMEM;
 +
++	apc->mmr_mem = devm_ioremap_nocache(dev, AR2315_PCI, AR2315_PCI_SIZE);
++	if (!apc->mmr_mem)
++		return -ENOMEM;
++
 +	apc->mem_res.name = "AR2315 PCI mem space";
 +	apc->mem_res.start = AR2315_PCIEXT;
 +	apc->mem_res.end = AR2315_PCIEXT + AR2315_PCIEXT_SZ - 1;
@@ -396,19 +431,21 @@
 +	}
 +
 +	/* Reset the PCI bus by setting bits 5-4 in PCI_MCFG */
-+	ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_RST_MODE,
-+			AR2315_PCIRST_LOW);
++	ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG,
++			    AR2315_PCIMISC_RST_MODE,
++			    AR2315_PCIRST_LOW);
 +	msleep(100);
 +
 +	/* Bring the PCI out of reset */
-+	ar231x_mask_reg(AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_RST_MODE,
-+			AR2315_PCIRST_HIGH | AR2315_PCICACHE_DIS | 0x8);
++	ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG,
++			    AR2315_PCIMISC_RST_MODE,
++			    AR2315_PCIRST_HIGH | AR2315_PCICACHE_DIS | 0x8);
 +
-+	ar231x_write_reg(AR2315_PCI_UNCACHE_CFG,
-+			 0x1E | /* 1GB uncached */
-+			 (1 << 5) | /* Enable uncached */
-+			 (0x2 << 30) /* Base: 0x80000000 */);
-+	ar231x_read_reg(AR2315_PCI_UNCACHE_CFG);
++	ar2315_pci_reg_write(apc, AR2315_PCI_UNCACHE_CFG,
++			     0x1E | /* 1GB uncached */
++			     (1 << 5) | /* Enable uncached */
++			     (0x2 << 30) /* Base: 0x80000000 */);
++	ar2315_pci_reg_read(apc, AR2315_PCI_UNCACHE_CFG);
 +
 +	msleep(500);
 +
@@ -416,7 +453,7 @@
 +	if (err)
 +		return err;
 +
-+	ar2315_pci_irq_init();
++	ar2315_pci_irq_init(apc);
 +
 +	/* PCI controller does not support I/O ports */
 +	apc->io_res.name = "AR2315 IO space";