path: root/target/linux/mpc83xx/patches-3.3/202-ata-add-pata_rbppc_cf-driver.patch

--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -899,5 +899,12 @@ config PATA_LEGACY
 
 	  If unsure, say N.
 
+config PATA_RB_PPC
+	tristate "MikroTik RB600 PATA support"
+	depends on RB_PPC
+	help
+	  This option enables support for PATA devices on MikroTik RouterBOARD
+	  600 series boards.
+
 endif # ATA_SFF
 endif # ATA
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -89,6 +89,7 @@ obj-$(CONFIG_PATA_PALMLD)	+= pata_palmld
 obj-$(CONFIG_PATA_PLATFORM)	+= pata_platform.o
 obj-$(CONFIG_PATA_OF_PLATFORM)	+= pata_of_platform.o
 obj-$(CONFIG_PATA_RB532)	+= pata_rb532_cf.o
+obj-$(CONFIG_PATA_RB_PPC)	+= pata_rbppc_cf.o
 obj-$(CONFIG_PATA_RZ1000)	+= pata_rz1000.o
 obj-$(CONFIG_PATA_SAMSUNG_CF)	+= pata_samsung_cf.o
 
--- /dev/null
+++ b/drivers/ata/pata_rbppc_cf.c
@@ -0,0 +1,699 @@
+/*
+ * Copyright (C) 2008-2009 Noah Fontes <nfontes@transtruct.org>
+ * Copyright (C) Mikrotik 2007
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+#include <linux/of_platform.h>
+#include <linux/ata_platform.h>
+#include <linux/slab.h>
+
+#define DEBUG_UPM	0
+
+#define DRV_NAME	"pata_rbppc_cf"
+#define DRV_VERSION	"0.0.2"
+
+#define DEV2SEL_OFFSET	0x00100000
+
+#define IMMR_LBCFG_OFFSET	0x00005000
+#define IMMR_LBCFG_SIZE		0x00001000
+
+#define LOCAL_BUS_MCMR		0x00000078
+#define   MxMR_OP_MASK			0x30000000
+#define   MxMR_OP_NORMAL		0x00000000
+#define   MxMR_OP_WRITE			0x10000000
+#define   MxMR_OP_READ			0x20000000
+#define   MxMR_OP_RUN			0x30000000
+#define   MxMR_LUPWAIT_LOW		0x08000000
+#define   MxMR_LUPWAIT_HIGH		0x00000000
+#define   MxMR_LUPWAIT_ENABLE		0x00040000
+#define   MxMR_RLF_MASK			0x0003c000
+#define   MxMR_RLF_SHIFT			14
+#define   MxMR_WLF_MASK			0x00003c00
+#define   MxMR_WLF_SHIFT			10
+#define   MxMR_MAD_MASK			0x0000003f
+#define LOCAL_BUS_MDR		0x00000088
+#define LOCAL_BUS_LCRR		0x000000D4
+#define   LCRR_CLKDIV_MASK		0x0000000f
+
+#define LOOP_SIZE	4
+
+#define UPM_READ_SINGLE_OFFSET	0x00
+#define UPM_WRITE_SINGLE_OFFSET	0x18
+#define UPM_DATA_SIZE	0x40
+
+#define LBT_CPUIN_MIN		0
+#define LBT_CPUOUT_MIN		1
+#define LBT_CPUOUT_MAX		2
+#define LBT_EXTDEL_MIN		3
+#define LBT_EXTDEL_MAX		4
+#define LBT_SIZE		5
+
+/* UPM machine configuration bits */
+#define N_BASE	0x00f00000
+#define N_CS	0xf0000000
+#define N_CS_H1	0xc0000000
+#define N_CS_H2	0x30000000
+#define N_WE	0x0f000000
+#define N_WE_H1	0x0c000000
+#define N_WE_H2	0x03000000
+#define N_OE	0x00030000
+#define N_OE_H1	0x00020000
+#define N_OE_H2	0x00010000
+#define WAEN	0x00001000
+#define REDO_2	0x00000100
+#define REDO_3	0x00000200
+#define REDO_4	0x00000300
+#define LOOP	0x00000080
+#define NA	0x00000008
+#define UTA	0x00000004
+#define LAST	0x00000001
+
+#define REDO_VAL(mult)	(REDO_2 * ((mult) - 1))
+#define REDO_MAX_MULT	4
+
+#define READ_BASE	(N_BASE | N_WE)
+#define WRITE_BASE	(N_BASE | N_OE)
+#define EMPTY		(N_BASE | N_CS | N_OE | N_WE | LAST)
+
+#define EOF_UPM_SETTINGS	0
+#define ANOTHER_TIMING		1
+
+#define OA_CPUIN_MIN		0x01
+#define OA_CPUOUT_MAX		0x02
+#define OD_CPUOUT_MIN		0x04
+#define OA_CPUOUT_DELTA		0x06
+#define OA_EXTDEL_MAX		0x08
+#define OD_EXTDEL_MIN		0x10
+#define OA_EXTDEL_DELTA		0x18
+#define O_MIN_CYCLE_TIME	0x20
+#define O_MINUS_PREV		0x40
+#define O_HALF_CYCLE		0x80
+
+extern void __iomem *localbus_map(unsigned long addr, unsigned int len);
+extern void localbus_unmap(void __iomem *addr);
+
+struct rbppc_cf_info {
+	unsigned lbcfg_addr;
+	unsigned clk_time_ps;
+	int cur_mode;
+	u32 lb_timings[LBT_SIZE];
+};
+static struct rbppc_cf_info *rbinfo = NULL;
+
+struct upm_setting {
+	unsigned value;
+	unsigned ns[7];
+	unsigned clk_minus;
+	unsigned group_size;
+	unsigned options;
+};
+
+static const struct upm_setting cfUpmReadSingle[] = {
+	{ READ_BASE | N_OE,
+	  /* t1 - ADDR setup time */
+		{  70,  50,  30,  30,  25,  15,  10 }, 0, 0, (OA_CPUOUT_DELTA |
+							      OA_EXTDEL_MAX) },
+	{ READ_BASE | N_OE_H1,
+		{   0,   0,   0,   0,   0,   0,   0 }, 0, 0, O_HALF_CYCLE },
+	{ READ_BASE,
+	  /* t2 - OE0 time */
+		{ 290, 290, 290,  80,  70,  65,  55 }, 0, 2, (OA_CPUOUT_MAX |
+							      OA_CPUIN_MIN) },
+	{ READ_BASE | WAEN,
+		{   1,   1,   1,   1,   1,   0,   0 }, 0, 0, 0 },
+	{ READ_BASE | UTA,
+		{   1,   1,   1,   1,   1,   1,   1 }, 0, 0, 0 },
+	{ READ_BASE | N_OE,
+	  /* t9 - ADDR hold time */
+		{  20,  15,  10,  10,  10,  10,  10 }, 0, 0, (OA_CPUOUT_DELTA |
+							      OD_EXTDEL_MIN) },
+	{ READ_BASE | N_OE | N_CS_H2,
+		{   0,   0,   0,   0,   0,   0,   0 }, 0, 0, O_HALF_CYCLE },
+	{ READ_BASE | N_OE | N_CS,
+	  /* t6Z -IORD data tristate */
+		{  30,  30,  30,  30,  30,  20,  20 }, 1, 1, O_MINUS_PREV },
+	{ ANOTHER_TIMING,
+	  /* t2i -IORD recovery time */
+		{   0,   0,   0,  70,  25,  25,  20 }, 2, 0, 0 },
+	{ ANOTHER_TIMING,
+	  /* CS 0 -> 1 MAX */
+		{   0,   0,   0,   0,   0,   0,   0 }, 1, 0, (OA_CPUOUT_DELTA |
+							      OA_EXTDEL_MAX) },
+	{ READ_BASE | N_OE | N_CS | LAST,
+		{   1,   1,   1,   1,   1,   1,   1 }, 0, 0, 0 },
+	{ EOF_UPM_SETTINGS,
+	  /* min total cycle time - includes turnaround and ALE cycle */
+		{ 600, 383, 240, 180, 120, 100,  80 }, 2, 0, O_MIN_CYCLE_TIME },
+};
+
+static const struct upm_setting cfUpmWriteSingle[] = {
+	{ WRITE_BASE | N_WE,
+	  /* t1 - ADDR setup time */
+		{  70,  50,  30,  30,  25,  15,  10 }, 0, 0, (OA_CPUOUT_DELTA |
+							      OA_EXTDEL_MAX) },
+	{ WRITE_BASE | N_WE_H1,
+		{   0,   0,   0,   0,   0,   0,   0 }, 0, 0, O_HALF_CYCLE },
+	{ WRITE_BASE,
+	  /* t2 - WE0 time */
+		{ 290, 290, 290,  80,  70,  65,  55 }, 0, 1, OA_CPUOUT_DELTA },
+	{ WRITE_BASE | WAEN,
+		{   1,   1,   1,   1,   1,   0,   0 }, 0, 0, 0 },
+	{ WRITE_BASE | N_WE,
+	  /* t9 - ADDR hold time */
+		{  20,  15,  10,  10,  10,  10,  10 }, 0, 0, (OA_CPUOUT_DELTA |
+							      OD_EXTDEL_MIN) },
+	{ WRITE_BASE | N_WE | N_CS_H2,
+		{   0,   0,   0,   0,   0,   0,   0 }, 0, 0, O_HALF_CYCLE },
+	{ WRITE_BASE | N_WE | N_CS,
+	  /* t4 - DATA hold time */
+		{  30,  20,  15,  10,  10,  10,  10 }, 0, 1, O_MINUS_PREV },
+	{ ANOTHER_TIMING,
+	  /* t2i -IOWR recovery time */
+		{   0,   0,   0,  70,  25,  25,  20 }, 1, 0, 0 },
+	{ ANOTHER_TIMING,
+	  /* CS 0 -> 1 MAX */
+		{   0,   0,   0,   0,   0,   0,   0 }, 0, 0, (OA_CPUOUT_DELTA |
+							      OA_EXTDEL_MAX) },
+	{ WRITE_BASE | N_WE | N_CS | UTA | LAST,
+		{   1,   1,   1,   1,   1,   1,   1 }, 0, 0, 0 },
+	/* min total cycle time - includes ALE cycle */
+	{ EOF_UPM_SETTINGS,
+		{ 600, 383, 240, 180, 120, 100,  80 }, 1, 0, O_MIN_CYCLE_TIME },
+};
+
+static u8 rbppc_cf_check_status(struct ata_port *ap) {
+	u8 val = ioread8(ap->ioaddr.status_addr);
+	if (val == 0xF9)
+		val = 0x7F;
+	return val;
+}
+
+static u8 rbppc_cf_check_altstatus(struct ata_port *ap) {
+	u8 val = ioread8(ap->ioaddr.altstatus_addr);
+	if (val == 0xF9)
+		val = 0x7F;
+	return val;
+}
+
+static void rbppc_cf_dummy_noret(struct ata_port *ap) { }
+static int rbppc_cf_dummy_ret0(struct ata_port *ap) { return 0; }
+
+static int ps2clk(int ps, unsigned clk_time_ps) {
+	int psMaxOver;
+	if (ps <= 0) return 0;
+
+	/* round down if <= 2% over clk border, but no more than 1/4 clk cycle */
+	psMaxOver = ps * 2 / 100;
+	if (4 * psMaxOver > clk_time_ps) {
+		psMaxOver = clk_time_ps / 4;
+	}
+	return (ps + clk_time_ps - 1 - psMaxOver) / clk_time_ps;
+}
+
+static int upm_gen_ps_table(const struct upm_setting *upm,
+			    int mode, struct rbppc_cf_info *info,
+			    int *psFinal) {
+	int uidx;
+	int lastUpmValIdx = 0;
+	int group_start_idx = -1;
+	int group_left_num = -1;
+	int clk_time_ps = info->clk_time_ps;
+
+	for (uidx = 0; upm[uidx].value != EOF_UPM_SETTINGS; ++uidx) {
+		const struct upm_setting *us = upm + uidx;
+		unsigned opt = us->options;
+		int ps = us->ns[mode] * 1000 - us->clk_minus * clk_time_ps;
+
+		if (opt & OA_CPUIN_MIN) ps += info->lb_timings[LBT_CPUIN_MIN];
+		if (opt & OD_CPUOUT_MIN) ps -= info->lb_timings[LBT_CPUOUT_MIN];
+		if (opt & OA_CPUOUT_MAX) ps += info->lb_timings[LBT_CPUOUT_MAX];
+		if (opt & OD_EXTDEL_MIN) ps -= info->lb_timings[LBT_EXTDEL_MIN];
+		if (opt & OA_EXTDEL_MAX) ps += info->lb_timings[LBT_EXTDEL_MAX];
+
+		if (us->value == ANOTHER_TIMING) {
+			/* use longest timing from alternatives */
+			if (psFinal[lastUpmValIdx] < ps) {
+				psFinal[lastUpmValIdx] = ps;
+			}
+			ps = 0;
+		}
+		else {
+			if (us->group_size) {
+				group_start_idx = uidx;
+				group_left_num = us->group_size;
+			}
+			else if (group_left_num > 0) {
+				/* group time is divided on all group members */
+				int clk = ps2clk(ps, clk_time_ps);
+				psFinal[group_start_idx] -= clk * clk_time_ps;
+				--group_left_num;
+			}
+			if ((opt & O_MINUS_PREV) && lastUpmValIdx > 0) {
+				int clk = ps2clk(psFinal[lastUpmValIdx],
+						 clk_time_ps);
+				ps -= clk * clk_time_ps;
+			}
+			lastUpmValIdx = uidx;
+		}
+		psFinal[uidx] = ps;
+	}
+	return uidx;
+}
+
+static int free_half(int ps, int clk, int clk_time_ps) {
+    if (clk < 2) return 0;
+    return (clk * clk_time_ps - ps) * 2 >= clk_time_ps;
+}
+
+static void upm_gen_clk_table(const struct upm_setting *upm,
+			      int mode, int clk_time_ps,
+			      int max_uidx, const int *psFinal, int *clkFinal) {
+	int clk_cycle_time;
+	int clk_total;
+	int uidx;
+
+	/* convert picoseconds to clocks */
+	clk_total = 0;
+	for (uidx = 0; uidx < max_uidx; ++uidx) {
+		int clk = ps2clk(psFinal[uidx], clk_time_ps);
+		clkFinal[uidx] = clk;
+		clk_total += clk;
+	}
+
+	/* check possibility of half cycle usage */
+	for (uidx = 1; uidx < max_uidx - 1; ++uidx) {
+		if ((upm[uidx].options & O_HALF_CYCLE) &&
+		    free_half(psFinal[uidx - 1], clkFinal[uidx - 1],
+			      clk_time_ps) &&
+		    free_half(psFinal[uidx + 1], clkFinal[uidx + 1],
+			      clk_time_ps)) {
+			++clkFinal[uidx];
+			--clkFinal[uidx - 1];
+			--clkFinal[uidx + 1];
+		}
+	}
+
+	if ((upm[max_uidx].options & O_MIN_CYCLE_TIME) == 0) return;
+
+	/* check cycle time, adjust timings if needed */
+	clk_cycle_time = (ps2clk(upm[max_uidx].ns[mode] * 1000, clk_time_ps) -
+			  upm[max_uidx].clk_minus);
+	uidx = 0;
+	while (clk_total < clk_cycle_time) {
+		/* extend all timings in round-robin to match cycle time */
+		if (clkFinal[uidx]) {
+#if DEBUG_UPM
+			printk(KERN_INFO "extending %u by 1 clk\n", uidx);
+#endif
+			++clkFinal[uidx];
+			++clk_total;
+		}
+		++uidx;
+		if (uidx == max_uidx) uidx = 0;
+	}
+}
+
+static void add_data_val(unsigned val, int *clkLeft, int maxClk,
+			unsigned *data, int *dataIdx) {
+	if (*clkLeft == 0) return;
+
+	if (maxClk == 0 && *clkLeft >= LOOP_SIZE * 2) {
+		int times;
+		int times1;
+		int times2;
+
+		times = *clkLeft / LOOP_SIZE;
+		if (times > REDO_MAX_MULT * 2) times = REDO_MAX_MULT * 2;
+		times1 = times / 2;
+		times2 = times - times1;
+
+		val |= LOOP;
+		data[*dataIdx] = val | REDO_VAL(times1);
+		++(*dataIdx);
+		data[*dataIdx] = val | REDO_VAL(times2);
+		++(*dataIdx);
+
+		*clkLeft -= times * LOOP_SIZE;
+		return;
+	}
+
+	if (maxClk < 1 || maxClk > REDO_MAX_MULT) maxClk = REDO_MAX_MULT;
+	if (*clkLeft < maxClk) maxClk = *clkLeft;
+
+	*clkLeft -= maxClk;
+	val |= REDO_VAL(maxClk);
+
+	data[*dataIdx] = val;
+	++(*dataIdx);
+}
+
+static int upm_gen_final_data(const struct upm_setting *upm,
+			       int max_uidx, int *clkFinal, unsigned *data) {
+	int dataIdx;
+	int uidx;
+
+	dataIdx = 0;
+	for (uidx = 0; uidx < max_uidx; ++uidx) {
+		int clk = clkFinal[uidx];
+		while (clk > 0) {
+			add_data_val(upm[uidx].value, &clk, 0,
+				     data, &dataIdx);
+		}
+	}
+	return dataIdx;
+}
+
+static int conv_upm_table(const struct upm_setting *upm,
+			  int mode, struct rbppc_cf_info *info,
+			  unsigned *data) {
+#if DEBUG_UPM
+	int uidx;
+#endif
+	int psFinal[32];
+	int clkFinal[32];
+	int max_uidx;
+	int data_len;
+
+	max_uidx = upm_gen_ps_table(upm, mode, info, psFinal);
+
+	upm_gen_clk_table(upm, mode, info->clk_time_ps, max_uidx,
+			  psFinal, clkFinal);
+
+#if DEBUG_UPM
+	/* dump out debug info */
+	for (uidx = 0; uidx < max_uidx; ++uidx) {
+		if (clkFinal[uidx]) {
+			printk(KERN_INFO "idx %d val %08x clk %d ps %d\n",
+				uidx, upm[uidx].value,
+				clkFinal[uidx], psFinal[uidx]);
+		}
+	}
+#endif
+
+	data_len = upm_gen_final_data(upm, max_uidx, clkFinal, data);
+
+#if DEBUG_UPM
+	for (uidx = 0; uidx < data_len; ++uidx) {
+		printk(KERN_INFO "cf UPM x result: idx %d val %08x\n",
+		       uidx, data[uidx]);
+	}
+#endif
+	return 0;
+}
+
+static int gen_upm_data(int mode, struct rbppc_cf_info *info, unsigned *data) {
+	int i;
+
+	for (i = 0; i < UPM_DATA_SIZE; ++i) {
+		data[i] = EMPTY;
+	}
+
+	if (conv_upm_table(cfUpmReadSingle, mode, info, data + UPM_READ_SINGLE_OFFSET)) {
+		return -1;
+	}
+	if (conv_upm_table(cfUpmWriteSingle, mode, info, data + UPM_WRITE_SINGLE_OFFSET)) {
+		return -1;
+	}
+	return 0;
+}
+
+static void rbppc_cf_program_upm(void *upmMemAddr, volatile void *lbcfg_mxmr, volatile void *lbcfg_mdr, const unsigned *upmData, unsigned offset, unsigned len) {
+	unsigned i;
+	unsigned mxmr;
+
+	mxmr = in_be32(lbcfg_mxmr);
+	mxmr &= ~(MxMR_OP_MASK | MxMR_MAD_MASK);
+	mxmr |= (MxMR_OP_WRITE | offset);
+	out_be32(lbcfg_mxmr, mxmr);
+	in_be32(lbcfg_mxmr); /* flush MxMR write */
+
+	for (i = 0; i < len; ++i) {
+		int to;
+		unsigned data = upmData[i + offset];
+		out_be32(lbcfg_mdr, data);
+		in_be32(lbcfg_mdr); /* flush MDR write */
+
+		iowrite8(1, upmMemAddr); /* dummy write to any CF addr */
+
+		/* wait for dummy write to complete */
+		for (to = 10000; to >= 0; --to) {
+			mxmr = in_be32(lbcfg_mxmr);
+			if (((mxmr ^ (i + 1)) & MxMR_MAD_MASK) == 0) {
+				break;
+			}
+			if (to == 0) {
+				printk(KERN_ERR "rbppc_cf_program_upm: UPMx program error at 0x%x: Timeout\n", i);
+			}
+		}
+	}
+	mxmr &= ~(MxMR_OP_MASK | MxMR_RLF_MASK | MxMR_WLF_MASK);
+	mxmr |= (MxMR_OP_NORMAL | (LOOP_SIZE << MxMR_RLF_SHIFT) | (LOOP_SIZE << MxMR_WLF_SHIFT));
+	out_be32(lbcfg_mxmr, mxmr);
+}
+
+static int rbppc_cf_update_piomode(struct ata_port *ap, int mode) {
+	struct rbppc_cf_info *info = (struct rbppc_cf_info *)ap->host->private_data;
+	void *lbcfgBase;
+	unsigned upmData[UPM_DATA_SIZE];
+
+	if (gen_upm_data(mode, info, upmData)) {
+		return -1;
+	}
+
+	lbcfgBase = ioremap_nocache(info->lbcfg_addr, IMMR_LBCFG_SIZE);
+
+	rbppc_cf_program_upm(ap->ioaddr.cmd_addr, ((char *)lbcfgBase) + LOCAL_BUS_MCMR, ((char *)lbcfgBase) + LOCAL_BUS_MDR, upmData, 0, UPM_DATA_SIZE);
+	iounmap(lbcfgBase);
+	return 0;
+}
+
+static void rbppc_cf_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+	struct rbppc_cf_info *info = (struct rbppc_cf_info *)ap->host->private_data;
+	int mode = adev->pio_mode - XFER_PIO_0;
+
+	DPRINTK("rbppc_cf_set_piomode: PIO %d\n", mode);
+	if (mode < 0) mode = 0;
+	if (mode > 6) mode = 6;
+
+	if (info->cur_mode < 0 || info->cur_mode > mode) {
+		if (rbppc_cf_update_piomode(ap, mode) == 0) {
+			printk(KERN_INFO "rbppc_cf_set_piomode: PIO mode changed to %d\n", mode);
+			info->cur_mode = mode;
+		}
+	}
+}
+
+static struct scsi_host_template rbppc_cf_sht = {
+	ATA_BASE_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations rbppc_cf_port_ops = {
+	.inherits		= &ata_bmdma_port_ops,
+
+	.sff_check_status	= rbppc_cf_check_status,
+	.sff_check_altstatus	= rbppc_cf_check_altstatus,
+
+	.set_piomode		= rbppc_cf_set_piomode,
+
+	.port_start		= rbppc_cf_dummy_ret0,
+
+	.sff_irq_clear		= rbppc_cf_dummy_noret,
+};
+
+static int rbppc_cf_init_info(struct platform_device *pdev, struct rbppc_cf_info *info) {
+	struct device_node *np;
+	struct resource res;
+	const u32 *u32ptr;
+	void *lbcfgBase;
+	void *lbcfg_lcrr;
+	unsigned lbc_clk_khz;
+	unsigned lbc_extra_divider = 1;
+	unsigned ccb_freq_hz;
+	unsigned lb_div;
+
+	u32ptr = of_get_property(pdev->dev.of_node, "lbc_extra_divider", NULL);
+	if (u32ptr && *u32ptr) {
+		lbc_extra_divider = *u32ptr;
+#if DEBUG_UPM
+		printk(KERN_INFO "rbppc_cf_init_info: LBC extra divider %u\n",
+		       lbc_extra_divider);
+#endif
+	}
+
+	np = of_find_node_by_type(NULL, "serial");
+	if (!np) {
+		printk(KERN_ERR "rbppc_cf_init_info: No serial node found\n");
+		return -1;
+	}
+	u32ptr = of_get_property(np, "clock-frequency", NULL);
+	if (u32ptr == 0 || *u32ptr == 0) {
+		printk(KERN_ERR "rbppc_cf_init_info: Serial does not have clock-frequency\n");
+		of_node_put(np);
+		return -1;
+	}
+	ccb_freq_hz = *u32ptr;
+	of_node_put(np);
+
+	np = of_find_node_by_type(NULL, "soc");
+	if (!np) {
+		printk(KERN_ERR "rbppc_cf_init_info: No soc node found\n");
+		return -1;
+	}
+	if (of_address_to_resource(np, 0, &res)) {
+		printk(KERN_ERR "rbppc_cf_init_info: soc does not have resource\n");
+		of_node_put(np);
+		return -1;
+	}
+	info->lbcfg_addr = res.start + IMMR_LBCFG_OFFSET;
+	of_node_put(np);
+
+	lbcfgBase = ioremap_nocache(info->lbcfg_addr, IMMR_LBCFG_SIZE);
+	lbcfg_lcrr = ((char*)lbcfgBase) + LOCAL_BUS_LCRR;
+	lb_div = (in_be32(lbcfg_lcrr) & LCRR_CLKDIV_MASK) * lbc_extra_divider;
+	iounmap(lbcfgBase);
+
+	lbc_clk_khz = ccb_freq_hz / (1000 * lb_div);
+	info->clk_time_ps = 1000000000 / lbc_clk_khz;
+	printk(KERN_INFO "rbppc_cf_init_info: Using Local-Bus clock %u kHz %u ps\n",
+	       lbc_clk_khz, info->clk_time_ps);
+
+	u32ptr = of_get_property(pdev->dev.of_node, "lb-timings", NULL);
+	if (u32ptr) {
+		memcpy(info->lb_timings, u32ptr, LBT_SIZE * sizeof(*u32ptr));
+#if DEBUG_UPM
+		printk(KERN_INFO "rbppc_cf_init_info: Got LB timings <%u %u %u %u %u>\n",
+		       u32ptr[0], u32ptr[1], u32ptr[2], u32ptr[3], u32ptr[4]);
+#endif
+	}
+	info->cur_mode = -1;
+	return 0;
+}
+
+static int rbppc_cf_probe(struct platform_device *pdev)
+{
+	struct ata_host *host;
+	struct ata_port *ap;
+	struct rbppc_cf_info *info = NULL;
+	struct resource res;
+	void *baddr;
+	const u32 *u32ptr;
+	int irq_level = 0;
+	int err = -ENOMEM;
+
+	printk(KERN_INFO "rbppc_cf_probe: MikroTik RouterBOARD 600 series Compact Flash PATA driver, version " DRV_VERSION "\n");
+
+	if (rbinfo == NULL) {
+		info = kmalloc(sizeof(*info), GFP_KERNEL);
+		if (info == NULL) {
+			printk(KERN_ERR "rbppc_cf_probe: Out of memory\n");
+			goto err_info;
+		}
+		memset(info, 0, sizeof(*info));
+
+		if (rbppc_cf_init_info(pdev, info)) {
+			goto err_info;
+		}
+		rbinfo = info;
+	}
+
+	u32ptr = of_get_property(pdev->dev.of_node, "interrupt-at-level", NULL);
+	if (u32ptr) {
+		irq_level = *u32ptr;
+		printk(KERN_INFO "rbppc_cf_probe: IRQ level %u\n", irq_level);
+	}
+
+	if (of_address_to_resource(pdev->dev.of_node, 0, &res)) {
+	    printk(KERN_ERR "rbppc_cf_probe: No reg property found\n");
+	    goto err_info;
+	}
+
+	host = ata_host_alloc(&pdev->dev, 1);
+	if (!host)
+	    goto err_info;
+
+	baddr = localbus_map(res.start, res.end - res.start + 1);
+	host->iomap = baddr;
+	host->private_data = rbinfo;
+
+	ap = host->ports[0];
+	ap->ops = &rbppc_cf_port_ops;
+	ap->pio_mask = 0x7F;	/* PIO modes 0-6 */
+	ap->mwdma_mask = 0;
+
+	ap->ioaddr.cmd_addr = baddr;
+	ata_sff_std_ports(&ap->ioaddr);
+	ap->ioaddr.ctl_addr = ap->ioaddr.cmd_addr + 14;
+	ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
+	ap->ioaddr.bmdma_addr = 0;
+
+	err = ata_host_activate(
+		host,
+		irq_of_parse_and_map(pdev->dev.of_node, 0), ata_sff_interrupt,
+		irq_level ? IRQF_TRIGGER_HIGH : IRQF_TRIGGER_LOW,
+		&rbppc_cf_sht);
+	if (!err) return 0;
+
+	localbus_unmap(baddr);
+err_info:
+	if (info) {
+		kfree(info);
+		rbinfo = NULL;
+	}
+	return err;
+}
+
+static int rbppc_cf_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ata_host *host = dev_get_drvdata(dev);
+
+	if (host == NULL) return -1;
+
+	ata_host_detach(host);
+	return 0;
+}
+
+static struct of_device_id rbppc_cf_ids[] = {
+	{ .name = "cf", },
+	{ },
+};
+
+static struct platform_driver rbppc_cf_driver = {
+	.probe = rbppc_cf_probe,
+	.remove = rbppc_cf_remove,
+	.driver	= {
+		.name = "rbppc-cf",
+		.owner = THIS_MODULE,
+		.of_match_table = rbppc_cf_ids,
+	},
+};
+
+static int __init rbppc_init(void)
+{
+	return platform_driver_register(&rbppc_cf_driver);
+}
+
+static void __exit rbppc_exit(void)
+{
+	platform_driver_unregister(&rbppc_cf_driver);
+}
+
+MODULE_AUTHOR("Mikrotikls SIA");
+MODULE_AUTHOR("Noah Fontes");
+MODULE_DESCRIPTION("MikroTik RouterBOARD 600 series Compact Flash PATA driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(rbppc_init);
+module_exit(rbppc_exit);