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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/powerpc/platforms/512x
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/platforms/512x')
-rw-r--r--arch/powerpc/platforms/512x/Kconfig42
-rw-r--r--arch/powerpc/platforms/512x/Makefile10
-rw-r--r--arch/powerpc/platforms/512x/clock-commonclk.c1224
-rw-r--r--arch/powerpc/platforms/512x/mpc5121_ads.c71
-rw-r--r--arch/powerpc/platforms/512x/mpc5121_ads.h12
-rw-r--r--arch/powerpc/platforms/512x/mpc5121_ads_cpld.c198
-rw-r--r--arch/powerpc/platforms/512x/mpc512x.h18
-rw-r--r--arch/powerpc/platforms/512x/mpc512x_generic.c51
-rw-r--r--arch/powerpc/platforms/512x/mpc512x_lpbfifo.c518
-rw-r--r--arch/powerpc/platforms/512x/mpc512x_shared.c506
-rw-r--r--arch/powerpc/platforms/512x/pdm360ng.c126
11 files changed, 2776 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/512x/Kconfig b/arch/powerpc/platforms/512x/Kconfig
new file mode 100644
index 0000000000..deecede787
--- /dev/null
+++ b/arch/powerpc/platforms/512x/Kconfig
@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: GPL-2.0
+config PPC_MPC512x
+ bool "512x-based boards"
+ depends on PPC_BOOK3S_32
+ select COMMON_CLK
+ select FSL_SOC
+ select IPIC
+ select HAVE_PCI
+ select FSL_PCI if PCI
+ select USB_EHCI_BIG_ENDIAN_MMIO if USB_EHCI_HCD
+ select USB_EHCI_BIG_ENDIAN_DESC if USB_EHCI_HCD
+
+config MPC512x_LPBFIFO
+ tristate "MPC512x LocalPlus Bus FIFO driver"
+ depends on PPC_MPC512x && MPC512X_DMA
+ help
+ Enable support for Freescale MPC512x LocalPlus Bus FIFO (SCLPC).
+
+config MPC5121_ADS
+ bool "Freescale MPC5121E ADS"
+ depends on PPC_MPC512x
+ select DEFAULT_UIMAGE
+ help
+ This option enables support for the MPC5121E ADS board.
+
+config MPC512x_GENERIC
+ bool "Generic support for simple MPC512x based boards"
+ depends on PPC_MPC512x
+ select DEFAULT_UIMAGE
+ help
+ This option enables support for simple MPC512x based boards
+ which do not need custom platform specific setup.
+
+ Compatible boards include: Protonic LVT base boards (ZANMCU
+ and VICVT2), Freescale MPC5125 Tower system.
+
+config PDM360NG
+ bool "ifm PDM360NG board"
+ depends on PPC_MPC512x
+ select DEFAULT_UIMAGE
+ help
+ This option enables support for the PDM360NG board.
diff --git a/arch/powerpc/platforms/512x/Makefile b/arch/powerpc/platforms/512x/Makefile
new file mode 100644
index 0000000000..2daf22ee26
--- /dev/null
+++ b/arch/powerpc/platforms/512x/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Freescale PowerPC 512x linux kernel.
+#
+obj-$(CONFIG_COMMON_CLK) += clock-commonclk.o
+obj-y += mpc512x_shared.o
+obj-$(CONFIG_MPC5121_ADS) += mpc5121_ads.o mpc5121_ads_cpld.o
+obj-$(CONFIG_MPC512x_GENERIC) += mpc512x_generic.o
+obj-$(CONFIG_MPC512x_LPBFIFO) += mpc512x_lpbfifo.o
+obj-$(CONFIG_PDM360NG) += pdm360ng.o
diff --git a/arch/powerpc/platforms/512x/clock-commonclk.c b/arch/powerpc/platforms/512x/clock-commonclk.c
new file mode 100644
index 0000000000..079cb3627e
--- /dev/null
+++ b/arch/powerpc/platforms/512x/clock-commonclk.c
@@ -0,0 +1,1224 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2013 DENX Software Engineering
+ *
+ * Gerhard Sittig, <gsi@denx.de>
+ *
+ * common clock driver support for the MPC512x platform
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <asm/mpc5121.h>
+#include <dt-bindings/clock/mpc512x-clock.h>
+
+#include "mpc512x.h" /* our public mpc5121_clk_init() API */
+
+/* helpers to keep the MCLK intermediates "somewhere" in our table */
+enum {
+ MCLK_IDX_MUX0,
+ MCLK_IDX_EN0,
+ MCLK_IDX_DIV0,
+ MCLK_MAX_IDX,
+};
+
+#define NR_PSCS 12
+#define NR_MSCANS 4
+#define NR_SPDIFS 1
+#define NR_OUTCLK 4
+#define NR_MCLKS (NR_PSCS + NR_MSCANS + NR_SPDIFS + NR_OUTCLK)
+
+/* extend the public set of clocks by adding internal slots for management */
+enum {
+ /* arrange for adjacent numbers after the public set */
+ MPC512x_CLK_START_PRIVATE = MPC512x_CLK_LAST_PUBLIC,
+ /* clocks which aren't announced to the public */
+ MPC512x_CLK_DDR,
+ MPC512x_CLK_MEM,
+ MPC512x_CLK_IIM,
+ /* intermediates in div+gate combos or fractional dividers */
+ MPC512x_CLK_DDR_UG,
+ MPC512x_CLK_SDHC_x4,
+ MPC512x_CLK_SDHC_UG,
+ MPC512x_CLK_SDHC2_UG,
+ MPC512x_CLK_DIU_x4,
+ MPC512x_CLK_DIU_UG,
+ MPC512x_CLK_MBX_BUS_UG,
+ MPC512x_CLK_MBX_UG,
+ MPC512x_CLK_MBX_3D_UG,
+ MPC512x_CLK_PCI_UG,
+ MPC512x_CLK_NFC_UG,
+ MPC512x_CLK_LPC_UG,
+ MPC512x_CLK_SPDIF_TX_IN,
+ /* intermediates for the mux+gate+div+mux MCLK generation */
+ MPC512x_CLK_MCLKS_FIRST,
+ MPC512x_CLK_MCLKS_LAST = MPC512x_CLK_MCLKS_FIRST
+ + NR_MCLKS * MCLK_MAX_IDX,
+ /* internal, symbolic spec for the number of slots */
+ MPC512x_CLK_LAST_PRIVATE,
+};
+
+/* data required for the OF clock provider registration */
+static struct clk *clks[MPC512x_CLK_LAST_PRIVATE];
+static struct clk_onecell_data clk_data;
+
+/* CCM register access */
+static struct mpc512x_ccm __iomem *clkregs;
+static DEFINE_SPINLOCK(clklock);
+
+/* SoC variants {{{ */
+
+/*
+ * tell SoC variants apart as they are rather similar yet not identical,
+ * cache the result in an enum to not repeatedly run the expensive OF test
+ *
+ * MPC5123 is an MPC5121 without the MBX graphics accelerator
+ *
+ * MPC5125 has many more differences: no MBX, no AXE, no VIU, no SPDIF,
+ * no PATA, no SATA, no PCI, two FECs (of different compatibility name),
+ * only 10 PSCs (of different compatibility name), two SDHCs, different
+ * NFC IP block, output clocks, system PLL status query, different CPMF
+ * interpretation, no CFM, different fourth PSC/CAN mux0 input -- yet
+ * those differences can get folded into this clock provider support
+ * code and don't warrant a separate highly redundant implementation
+ */
+
+static enum soc_type {
+ MPC512x_SOC_MPC5121,
+ MPC512x_SOC_MPC5123,
+ MPC512x_SOC_MPC5125,
+} soc;
+
+static void __init mpc512x_clk_determine_soc(void)
+{
+ if (of_machine_is_compatible("fsl,mpc5121")) {
+ soc = MPC512x_SOC_MPC5121;
+ return;
+ }
+ if (of_machine_is_compatible("fsl,mpc5123")) {
+ soc = MPC512x_SOC_MPC5123;
+ return;
+ }
+ if (of_machine_is_compatible("fsl,mpc5125")) {
+ soc = MPC512x_SOC_MPC5125;
+ return;
+ }
+}
+
+static bool __init soc_has_mbx(void)
+{
+ if (soc == MPC512x_SOC_MPC5121)
+ return true;
+ return false;
+}
+
+static bool __init soc_has_axe(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return false;
+ return true;
+}
+
+static bool __init soc_has_viu(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return false;
+ return true;
+}
+
+static bool __init soc_has_spdif(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return false;
+ return true;
+}
+
+static bool __init soc_has_pata(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return false;
+ return true;
+}
+
+static bool __init soc_has_sata(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return false;
+ return true;
+}
+
+static bool __init soc_has_pci(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return false;
+ return true;
+}
+
+static bool __init soc_has_fec2(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return true;
+ return false;
+}
+
+static int __init soc_max_pscnum(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return 10;
+ return 12;
+}
+
+static bool __init soc_has_sdhc2(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return true;
+ return false;
+}
+
+static bool __init soc_has_nfc_5125(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return true;
+ return false;
+}
+
+static bool __init soc_has_outclk(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return true;
+ return false;
+}
+
+static bool __init soc_has_cpmf_0_bypass(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return true;
+ return false;
+}
+
+static bool __init soc_has_mclk_mux0_canin(void)
+{
+ if (soc == MPC512x_SOC_MPC5125)
+ return true;
+ return false;
+}
+
+/* }}} SoC variants */
+/* common clk API wrappers {{{ */
+
+/* convenience wrappers around the common clk API */
+static inline struct clk *mpc512x_clk_fixed(const char *name, int rate)
+{
+ return clk_register_fixed_rate(NULL, name, NULL, 0, rate);
+}
+
+static inline struct clk *mpc512x_clk_factor(
+ const char *name, const char *parent_name,
+ int mul, int div)
+{
+ int clkflags;
+
+ clkflags = CLK_SET_RATE_PARENT;
+ return clk_register_fixed_factor(NULL, name, parent_name, clkflags,
+ mul, div);
+}
+
+static inline struct clk *mpc512x_clk_divider(
+ const char *name, const char *parent_name, u8 clkflags,
+ u32 __iomem *reg, u8 pos, u8 len, int divflags)
+{
+ divflags |= CLK_DIVIDER_BIG_ENDIAN;
+ return clk_register_divider(NULL, name, parent_name, clkflags,
+ reg, pos, len, divflags, &clklock);
+}
+
+static inline struct clk *mpc512x_clk_divtable(
+ const char *name, const char *parent_name,
+ u32 __iomem *reg, u8 pos, u8 len,
+ const struct clk_div_table *divtab)
+{
+ u8 divflags;
+
+ divflags = CLK_DIVIDER_BIG_ENDIAN;
+ return clk_register_divider_table(NULL, name, parent_name, 0,
+ reg, pos, len, divflags,
+ divtab, &clklock);
+}
+
+static inline struct clk *mpc512x_clk_gated(
+ const char *name, const char *parent_name,
+ u32 __iomem *reg, u8 pos)
+{
+ int clkflags;
+ u8 gateflags;
+
+ clkflags = CLK_SET_RATE_PARENT;
+ gateflags = CLK_GATE_BIG_ENDIAN;
+ return clk_register_gate(NULL, name, parent_name, clkflags,
+ reg, pos, gateflags, &clklock);
+}
+
+static inline struct clk *mpc512x_clk_muxed(const char *name,
+ const char **parent_names, int parent_count,
+ u32 __iomem *reg, u8 pos, u8 len)
+{
+ int clkflags;
+ u8 muxflags;
+
+ clkflags = CLK_SET_RATE_PARENT;
+ muxflags = CLK_MUX_BIG_ENDIAN;
+ return clk_register_mux(NULL, name,
+ parent_names, parent_count, clkflags,
+ reg, pos, len, muxflags, &clklock);
+}
+
+/* }}} common clk API wrappers */
+
+/* helper to isolate a bit field from a register */
+static inline int get_bit_field(uint32_t __iomem *reg, uint8_t pos, uint8_t len)
+{
+ uint32_t val;
+
+ val = in_be32(reg);
+ val >>= pos;
+ val &= (1 << len) - 1;
+ return val;
+}
+
+/* get the SPMF and translate it into the "sys pll" multiplier */
+static int __init get_spmf_mult(void)
+{
+ static int spmf_to_mult[] = {
+ 68, 1, 12, 16, 20, 24, 28, 32,
+ 36, 40, 44, 48, 52, 56, 60, 64,
+ };
+ int spmf;
+
+ spmf = get_bit_field(&clkregs->spmr, 24, 4);
+ return spmf_to_mult[spmf];
+}
+
+/*
+ * get the SYS_DIV value and translate it into a divide factor
+ *
+ * values returned from here are a multiple of the real factor since the
+ * divide ratio is fractional
+ */
+static int __init get_sys_div_x2(void)
+{
+ static int sysdiv_code_to_x2[] = {
+ 4, 5, 6, 7, 8, 9, 10, 14,
+ 12, 16, 18, 22, 20, 24, 26, 30,
+ 28, 32, 34, 38, 36, 40, 42, 46,
+ 44, 48, 50, 54, 52, 56, 58, 62,
+ 60, 64, 66,
+ };
+ int divcode;
+
+ divcode = get_bit_field(&clkregs->scfr2, 26, 6);
+ return sysdiv_code_to_x2[divcode];
+}
+
+/*
+ * get the CPMF value and translate it into a multiplier factor
+ *
+ * values returned from here are a multiple of the real factor since the
+ * multiplier ratio is fractional
+ */
+static int __init get_cpmf_mult_x2(void)
+{
+ static int cpmf_to_mult_x36[] = {
+ /* 0b000 is "times 36" */
+ 72, 2, 2, 3, 4, 5, 6, 7,
+ };
+ static int cpmf_to_mult_0by[] = {
+ /* 0b000 is "bypass" */
+ 2, 2, 2, 3, 4, 5, 6, 7,
+ };
+
+ int *cpmf_to_mult;
+ int cpmf;
+
+ cpmf = get_bit_field(&clkregs->spmr, 16, 4);
+ if (soc_has_cpmf_0_bypass())
+ cpmf_to_mult = cpmf_to_mult_0by;
+ else
+ cpmf_to_mult = cpmf_to_mult_x36;
+ return cpmf_to_mult[cpmf];
+}
+
+/*
+ * some of the clock dividers do scale in a linear way, yet not all of
+ * their bit combinations are legal; use a divider table to get a
+ * resulting set of applicable divider values
+ */
+
+/* applies to the IPS_DIV, and PCI_DIV values */
+static const struct clk_div_table divtab_2346[] = {
+ { .val = 2, .div = 2, },
+ { .val = 3, .div = 3, },
+ { .val = 4, .div = 4, },
+ { .val = 6, .div = 6, },
+ { .div = 0, },
+};
+
+/* applies to the MBX_DIV, LPC_DIV, and NFC_DIV values */
+static const struct clk_div_table divtab_1234[] = {
+ { .val = 1, .div = 1, },
+ { .val = 2, .div = 2, },
+ { .val = 3, .div = 3, },
+ { .val = 4, .div = 4, },
+ { .div = 0, },
+};
+
+static int __init get_freq_from_dt(char *propname)
+{
+ struct device_node *np;
+ const unsigned int *prop;
+ int val;
+
+ val = 0;
+ np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-immr");
+ if (np) {
+ prop = of_get_property(np, propname, NULL);
+ if (prop)
+ val = *prop;
+ of_node_put(np);
+ }
+ return val;
+}
+
+static void __init mpc512x_clk_preset_data(void)
+{
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(clks); i++)
+ clks[i] = ERR_PTR(-ENODEV);
+}
+
+/*
+ * - receives the "bus frequency" from the caller (that's the IPS clock
+ * rate, the historical source of clock information)
+ * - fetches the system PLL multiplier and divider values as well as the
+ * IPS divider value from hardware
+ * - determines the REF clock rate either from the XTAL/OSC spec (if
+ * there is a device tree node describing the oscillator) or from the
+ * IPS bus clock (supported for backwards compatibility, such that
+ * setups without XTAL/OSC specs keep working)
+ * - creates the "ref" clock item in the clock tree, such that
+ * subsequent code can create the remainder of the hierarchy (REF ->
+ * SYS -> CSB -> IPS) from the REF clock rate and the returned mul/div
+ * values
+ */
+static void __init mpc512x_clk_setup_ref_clock(struct device_node *np, int bus_freq,
+ int *sys_mul, int *sys_div,
+ int *ips_div)
+{
+ struct clk *osc_clk;
+ int calc_freq;
+
+ /* fetch mul/div factors from the hardware */
+ *sys_mul = get_spmf_mult();
+ *sys_mul *= 2; /* compensate for the fractional divider */
+ *sys_div = get_sys_div_x2();
+ *ips_div = get_bit_field(&clkregs->scfr1, 23, 3);
+
+ /* lookup the oscillator clock for its rate */
+ osc_clk = of_clk_get_by_name(np, "osc");
+
+ /*
+ * either descend from OSC to REF (and in bypassing verify the
+ * IPS rate), or backtrack from IPS and multiplier values that
+ * were fetched from hardware to REF and thus to the OSC value
+ *
+ * in either case the REF clock gets created here and the
+ * remainder of the clock tree can get spanned from there
+ */
+ if (!IS_ERR(osc_clk)) {
+ clks[MPC512x_CLK_REF] = mpc512x_clk_factor("ref", "osc", 1, 1);
+ calc_freq = clk_get_rate(clks[MPC512x_CLK_REF]);
+ calc_freq *= *sys_mul;
+ calc_freq /= *sys_div;
+ calc_freq /= 2;
+ calc_freq /= *ips_div;
+ if (bus_freq && calc_freq != bus_freq)
+ pr_warn("calc rate %d != OF spec %d\n",
+ calc_freq, bus_freq);
+ } else {
+ calc_freq = bus_freq; /* start with IPS */
+ calc_freq *= *ips_div; /* IPS -> CSB */
+ calc_freq *= 2; /* CSB -> SYS */
+ calc_freq *= *sys_div; /* SYS -> PLL out */
+ calc_freq /= *sys_mul; /* PLL out -> REF == OSC */
+ clks[MPC512x_CLK_REF] = mpc512x_clk_fixed("ref", calc_freq);
+ }
+}
+
+/* MCLK helpers {{{ */
+
+/*
+ * helper code for the MCLK subtree setup
+ *
+ * the overview in section 5.2.4 of the MPC5121e Reference Manual rev4
+ * suggests that all instances of the "PSC clock generation" are equal,
+ * and that one might re-use the PSC setup for MSCAN clock generation
+ * (section 5.2.5) as well, at least the logic if not the data for
+ * description
+ *
+ * the details (starting at page 5-20) show differences in the specific
+ * inputs of the first mux stage ("can clk in", "spdif tx"), and the
+ * factual non-availability of the second mux stage (it's present yet
+ * only one input is valid)
+ *
+ * the MSCAN clock related registers (starting at page 5-35) all
+ * reference "spdif clk" at the first mux stage and don't mention any
+ * "can clk" at all, which somehow is unexpected
+ *
+ * TODO re-check the document, and clarify whether the RM is correct in
+ * the overview or in the details, and whether the difference is a
+ * clipboard induced error or results from chip revisions
+ *
+ * it turns out that the RM rev4 as of 2012-06 talks about "can" for the
+ * PSCs while RM rev3 as of 2008-10 talks about "spdif", so I guess that
+ * first a doc update is required which better reflects reality in the
+ * SoC before the implementation should follow while no questions remain
+ */
+
+/*
+ * note that this declaration raises a checkpatch warning, but
+ * it's the very data type dictated by <linux/clk-provider.h>,
+ * "fixing" this warning will break compilation
+ */
+static const char *parent_names_mux0_spdif[] = {
+ "sys", "ref", "psc-mclk-in", "spdif-tx",
+};
+
+static const char *parent_names_mux0_canin[] = {
+ "sys", "ref", "psc-mclk-in", "can-clk-in",
+};
+
+enum mclk_type {
+ MCLK_TYPE_PSC,
+ MCLK_TYPE_MSCAN,
+ MCLK_TYPE_SPDIF,
+ MCLK_TYPE_OUTCLK,
+};
+
+struct mclk_setup_data {
+ enum mclk_type type;
+ bool has_mclk1;
+ const char *name_mux0;
+ const char *name_en0;
+ const char *name_div0;
+ const char *parent_names_mux1[2];
+ const char *name_mclk;
+};
+
+#define MCLK_SETUP_DATA_PSC(id) { \
+ MCLK_TYPE_PSC, 0, \
+ "psc" #id "-mux0", \
+ "psc" #id "-en0", \
+ "psc" #id "_mclk_div", \
+ { "psc" #id "_mclk_div", "dummy", }, \
+ "psc" #id "_mclk", \
+}
+
+#define MCLK_SETUP_DATA_MSCAN(id) { \
+ MCLK_TYPE_MSCAN, 0, \
+ "mscan" #id "-mux0", \
+ "mscan" #id "-en0", \
+ "mscan" #id "_mclk_div", \
+ { "mscan" #id "_mclk_div", "dummy", }, \
+ "mscan" #id "_mclk", \
+}
+
+#define MCLK_SETUP_DATA_SPDIF { \
+ MCLK_TYPE_SPDIF, 1, \
+ "spdif-mux0", \
+ "spdif-en0", \
+ "spdif_mclk_div", \
+ { "spdif_mclk_div", "spdif-rx", }, \
+ "spdif_mclk", \
+}
+
+#define MCLK_SETUP_DATA_OUTCLK(id) { \
+ MCLK_TYPE_OUTCLK, 0, \
+ "out" #id "-mux0", \
+ "out" #id "-en0", \
+ "out" #id "_mclk_div", \
+ { "out" #id "_mclk_div", "dummy", }, \
+ "out" #id "_clk", \
+}
+
+static struct mclk_setup_data mclk_psc_data[] = {
+ MCLK_SETUP_DATA_PSC(0),
+ MCLK_SETUP_DATA_PSC(1),
+ MCLK_SETUP_DATA_PSC(2),
+ MCLK_SETUP_DATA_PSC(3),
+ MCLK_SETUP_DATA_PSC(4),
+ MCLK_SETUP_DATA_PSC(5),
+ MCLK_SETUP_DATA_PSC(6),
+ MCLK_SETUP_DATA_PSC(7),
+ MCLK_SETUP_DATA_PSC(8),
+ MCLK_SETUP_DATA_PSC(9),
+ MCLK_SETUP_DATA_PSC(10),
+ MCLK_SETUP_DATA_PSC(11),
+};
+
+static struct mclk_setup_data mclk_mscan_data[] = {
+ MCLK_SETUP_DATA_MSCAN(0),
+ MCLK_SETUP_DATA_MSCAN(1),
+ MCLK_SETUP_DATA_MSCAN(2),
+ MCLK_SETUP_DATA_MSCAN(3),
+};
+
+static struct mclk_setup_data mclk_spdif_data[] = {
+ MCLK_SETUP_DATA_SPDIF,
+};
+
+static struct mclk_setup_data mclk_outclk_data[] = {
+ MCLK_SETUP_DATA_OUTCLK(0),
+ MCLK_SETUP_DATA_OUTCLK(1),
+ MCLK_SETUP_DATA_OUTCLK(2),
+ MCLK_SETUP_DATA_OUTCLK(3),
+};
+
+/* setup the MCLK clock subtree of an individual PSC/MSCAN/SPDIF */
+static void __init mpc512x_clk_setup_mclk(struct mclk_setup_data *entry, size_t idx)
+{
+ size_t clks_idx_pub, clks_idx_int;
+ u32 __iomem *mccr_reg; /* MCLK control register (mux, en, div) */
+ int div;
+
+ /* derive a few parameters from the component type and index */
+ switch (entry->type) {
+ case MCLK_TYPE_PSC:
+ clks_idx_pub = MPC512x_CLK_PSC0_MCLK + idx;
+ clks_idx_int = MPC512x_CLK_MCLKS_FIRST
+ + (idx) * MCLK_MAX_IDX;
+ mccr_reg = &clkregs->psc_ccr[idx];
+ break;
+ case MCLK_TYPE_MSCAN:
+ clks_idx_pub = MPC512x_CLK_MSCAN0_MCLK + idx;
+ clks_idx_int = MPC512x_CLK_MCLKS_FIRST
+ + (NR_PSCS + idx) * MCLK_MAX_IDX;
+ mccr_reg = &clkregs->mscan_ccr[idx];
+ break;
+ case MCLK_TYPE_SPDIF:
+ clks_idx_pub = MPC512x_CLK_SPDIF_MCLK;
+ clks_idx_int = MPC512x_CLK_MCLKS_FIRST
+ + (NR_PSCS + NR_MSCANS) * MCLK_MAX_IDX;
+ mccr_reg = &clkregs->spccr;
+ break;
+ case MCLK_TYPE_OUTCLK:
+ clks_idx_pub = MPC512x_CLK_OUT0_CLK + idx;
+ clks_idx_int = MPC512x_CLK_MCLKS_FIRST
+ + (NR_PSCS + NR_MSCANS + NR_SPDIFS + idx)
+ * MCLK_MAX_IDX;
+ mccr_reg = &clkregs->out_ccr[idx];
+ break;
+ default:
+ return;
+ }
+
+ /*
+ * this was grabbed from the PPC_CLOCK implementation, which
+ * enforced a specific MCLK divider while the clock was gated
+ * during setup (that's a documented hardware requirement)
+ *
+ * the PPC_CLOCK implementation might even have violated the
+ * "MCLK <= IPS" constraint, the fixed divider value of 1
+ * results in a divider of 2 and thus MCLK = SYS/2 which equals
+ * CSB which is greater than IPS; the serial port setup may have
+ * adjusted the divider which the clock setup might have left in
+ * an undesirable state
+ *
+ * initial setup is:
+ * - MCLK 0 from SYS
+ * - MCLK DIV such to not exceed the IPS clock
+ * - MCLK 0 enabled
+ * - MCLK 1 from MCLK DIV
+ */
+ div = clk_get_rate(clks[MPC512x_CLK_SYS]);
+ div /= clk_get_rate(clks[MPC512x_CLK_IPS]);
+ out_be32(mccr_reg, (0 << 16));
+ out_be32(mccr_reg, (0 << 16) | ((div - 1) << 17));
+ out_be32(mccr_reg, (1 << 16) | ((div - 1) << 17));
+
+ /*
+ * create the 'struct clk' items of the MCLK's clock subtree
+ *
+ * note that by design we always create all nodes and won't take
+ * shortcuts here, because
+ * - the "internal" MCLK_DIV and MCLK_OUT signal in turn are
+ * selectable inputs to the CFM while those who "actually use"
+ * the PSC/MSCAN/SPDIF (serial drivers et al) need the MCLK
+ * for their bitrate
+ * - in the absence of "aliases" for clocks we need to create
+ * individual 'struct clk' items for whatever might get
+ * referenced or looked up, even if several of those items are
+ * identical from the logical POV (their rate value)
+ * - for easier future maintenance and for better reflection of
+ * the SoC's documentation, it appears appropriate to generate
+ * clock items even for those muxers which actually are NOPs
+ * (those with two inputs of which one is reserved)
+ */
+ clks[clks_idx_int + MCLK_IDX_MUX0] = mpc512x_clk_muxed(
+ entry->name_mux0,
+ soc_has_mclk_mux0_canin()
+ ? &parent_names_mux0_canin[0]
+ : &parent_names_mux0_spdif[0],
+ ARRAY_SIZE(parent_names_mux0_spdif),
+ mccr_reg, 14, 2);
+ clks[clks_idx_int + MCLK_IDX_EN0] = mpc512x_clk_gated(
+ entry->name_en0, entry->name_mux0,
+ mccr_reg, 16);
+ clks[clks_idx_int + MCLK_IDX_DIV0] = mpc512x_clk_divider(
+ entry->name_div0,
+ entry->name_en0, CLK_SET_RATE_GATE,
+ mccr_reg, 17, 15, 0);
+ if (entry->has_mclk1) {
+ clks[clks_idx_pub] = mpc512x_clk_muxed(
+ entry->name_mclk,
+ &entry->parent_names_mux1[0],
+ ARRAY_SIZE(entry->parent_names_mux1),
+ mccr_reg, 7, 1);
+ } else {
+ clks[clks_idx_pub] = mpc512x_clk_factor(
+ entry->name_mclk,
+ entry->parent_names_mux1[0],
+ 1, 1);
+ }
+}
+
+/* }}} MCLK helpers */
+
+static void __init mpc512x_clk_setup_clock_tree(struct device_node *np, int busfreq)
+{
+ int sys_mul, sys_div, ips_div;
+ int mul, div;
+ size_t mclk_idx;
+ int freq;
+
+ /*
+ * developer's notes:
+ * - consider whether to handle clocks which have both gates and
+ * dividers via intermediates or by means of composites
+ * - fractional dividers appear to not map well to composites
+ * since they can be seen as a fixed multiplier and an
+ * adjustable divider, while composites can only combine at
+ * most one of a mux, div, and gate each into one 'struct clk'
+ * item
+ * - PSC/MSCAN/SPDIF clock generation OTOH already is very
+ * specific and cannot get mapped to composites (at least not
+ * a single one, maybe two of them, but then some of these
+ * intermediate clock signals get referenced elsewhere (e.g.
+ * in the clock frequency measurement, CFM) and thus need
+ * publicly available names
+ * - the current source layout appropriately reflects the
+ * hardware setup, and it works, so it's questionable whether
+ * further changes will result in big enough a benefit
+ */
+
+ /* regardless of whether XTAL/OSC exists, have REF created */
+ mpc512x_clk_setup_ref_clock(np, busfreq, &sys_mul, &sys_div, &ips_div);
+
+ /* now setup the REF -> SYS -> CSB -> IPS hierarchy */
+ clks[MPC512x_CLK_SYS] = mpc512x_clk_factor("sys", "ref",
+ sys_mul, sys_div);
+ clks[MPC512x_CLK_CSB] = mpc512x_clk_factor("csb", "sys", 1, 2);
+ clks[MPC512x_CLK_IPS] = mpc512x_clk_divtable("ips", "csb",
+ &clkregs->scfr1, 23, 3,
+ divtab_2346);
+ /* now setup anything below SYS and CSB and IPS */
+
+ clks[MPC512x_CLK_DDR_UG] = mpc512x_clk_factor("ddr-ug", "sys", 1, 2);
+
+ /*
+ * the Reference Manual discusses that for SDHC only even divide
+ * ratios are supported because clock domain synchronization
+ * between 'per' and 'ipg' is broken;
+ * keep the divider's bit 0 cleared (per reset value), and only
+ * allow to setup the divider's bits 7:1, which results in that
+ * only even divide ratios can get configured upon rate changes;
+ * keep the "x4" name because this bit shift hack is an internal
+ * implementation detail, the "fractional divider with quarters"
+ * semantics remains
+ */
+ clks[MPC512x_CLK_SDHC_x4] = mpc512x_clk_factor("sdhc-x4", "csb", 2, 1);
+ clks[MPC512x_CLK_SDHC_UG] = mpc512x_clk_divider("sdhc-ug", "sdhc-x4", 0,
+ &clkregs->scfr2, 1, 7,
+ CLK_DIVIDER_ONE_BASED);
+ if (soc_has_sdhc2()) {
+ clks[MPC512x_CLK_SDHC2_UG] = mpc512x_clk_divider(
+ "sdhc2-ug", "sdhc-x4", 0, &clkregs->scfr2,
+ 9, 7, CLK_DIVIDER_ONE_BASED);
+ }
+
+ clks[MPC512x_CLK_DIU_x4] = mpc512x_clk_factor("diu-x4", "csb", 4, 1);
+ clks[MPC512x_CLK_DIU_UG] = mpc512x_clk_divider("diu-ug", "diu-x4", 0,
+ &clkregs->scfr1, 0, 8,
+ CLK_DIVIDER_ONE_BASED);
+
+ /*
+ * the "power architecture PLL" was setup from data which was
+ * sampled from the reset config word, at this point in time the
+ * configuration can be considered fixed and read only (i.e. no
+ * longer adjustable, or no longer in need of adjustment), which
+ * is why we don't register a PLL here but assume fixed factors
+ */
+ mul = get_cpmf_mult_x2();
+ div = 2; /* compensate for the fractional factor */
+ clks[MPC512x_CLK_E300] = mpc512x_clk_factor("e300", "csb", mul, div);
+
+ if (soc_has_mbx()) {
+ clks[MPC512x_CLK_MBX_BUS_UG] = mpc512x_clk_factor(
+ "mbx-bus-ug", "csb", 1, 2);
+ clks[MPC512x_CLK_MBX_UG] = mpc512x_clk_divtable(
+ "mbx-ug", "mbx-bus-ug", &clkregs->scfr1,
+ 14, 3, divtab_1234);
+ clks[MPC512x_CLK_MBX_3D_UG] = mpc512x_clk_factor(
+ "mbx-3d-ug", "mbx-ug", 1, 1);
+ }
+ if (soc_has_pci()) {
+ clks[MPC512x_CLK_PCI_UG] = mpc512x_clk_divtable(
+ "pci-ug", "csb", &clkregs->scfr1,
+ 20, 3, divtab_2346);
+ }
+ if (soc_has_nfc_5125()) {
+ /*
+ * XXX TODO implement 5125 NFC clock setup logic,
+ * with high/low period counters in clkregs->scfr3,
+ * currently there are no users so it's ENOIMPL
+ */
+ clks[MPC512x_CLK_NFC_UG] = ERR_PTR(-ENOTSUPP);
+ } else {
+ clks[MPC512x_CLK_NFC_UG] = mpc512x_clk_divtable(
+ "nfc-ug", "ips", &clkregs->scfr1,
+ 8, 3, divtab_1234);
+ }
+ clks[MPC512x_CLK_LPC_UG] = mpc512x_clk_divtable("lpc-ug", "ips",
+ &clkregs->scfr1, 11, 3,
+ divtab_1234);
+
+ clks[MPC512x_CLK_LPC] = mpc512x_clk_gated("lpc", "lpc-ug",
+ &clkregs->sccr1, 30);
+ clks[MPC512x_CLK_NFC] = mpc512x_clk_gated("nfc", "nfc-ug",
+ &clkregs->sccr1, 29);
+ if (soc_has_pata()) {
+ clks[MPC512x_CLK_PATA] = mpc512x_clk_gated(
+ "pata", "ips", &clkregs->sccr1, 28);
+ }
+ /* for PSCs there is a "registers" gate and a bitrate MCLK subtree */
+ for (mclk_idx = 0; mclk_idx < soc_max_pscnum(); mclk_idx++) {
+ char name[12];
+ snprintf(name, sizeof(name), "psc%d", mclk_idx);
+ clks[MPC512x_CLK_PSC0 + mclk_idx] = mpc512x_clk_gated(
+ name, "ips", &clkregs->sccr1, 27 - mclk_idx);
+ mpc512x_clk_setup_mclk(&mclk_psc_data[mclk_idx], mclk_idx);
+ }
+ clks[MPC512x_CLK_PSC_FIFO] = mpc512x_clk_gated("psc-fifo", "ips",
+ &clkregs->sccr1, 15);
+ if (soc_has_sata()) {
+ clks[MPC512x_CLK_SATA] = mpc512x_clk_gated(
+ "sata", "ips", &clkregs->sccr1, 14);
+ }
+ clks[MPC512x_CLK_FEC] = mpc512x_clk_gated("fec", "ips",
+ &clkregs->sccr1, 13);
+ if (soc_has_pci()) {
+ clks[MPC512x_CLK_PCI] = mpc512x_clk_gated(
+ "pci", "pci-ug", &clkregs->sccr1, 11);
+ }
+ clks[MPC512x_CLK_DDR] = mpc512x_clk_gated("ddr", "ddr-ug",
+ &clkregs->sccr1, 10);
+ if (soc_has_fec2()) {
+ clks[MPC512x_CLK_FEC2] = mpc512x_clk_gated(
+ "fec2", "ips", &clkregs->sccr1, 9);
+ }
+
+ clks[MPC512x_CLK_DIU] = mpc512x_clk_gated("diu", "diu-ug",
+ &clkregs->sccr2, 31);
+ if (soc_has_axe()) {
+ clks[MPC512x_CLK_AXE] = mpc512x_clk_gated(
+ "axe", "csb", &clkregs->sccr2, 30);
+ }
+ clks[MPC512x_CLK_MEM] = mpc512x_clk_gated("mem", "ips",
+ &clkregs->sccr2, 29);
+ clks[MPC512x_CLK_USB1] = mpc512x_clk_gated("usb1", "csb",
+ &clkregs->sccr2, 28);
+ clks[MPC512x_CLK_USB2] = mpc512x_clk_gated("usb2", "csb",
+ &clkregs->sccr2, 27);
+ clks[MPC512x_CLK_I2C] = mpc512x_clk_gated("i2c", "ips",
+ &clkregs->sccr2, 26);
+ /* MSCAN differs from PSC with just one gate for multiple components */
+ clks[MPC512x_CLK_BDLC] = mpc512x_clk_gated("bdlc", "ips",
+ &clkregs->sccr2, 25);
+ for (mclk_idx = 0; mclk_idx < ARRAY_SIZE(mclk_mscan_data); mclk_idx++)
+ mpc512x_clk_setup_mclk(&mclk_mscan_data[mclk_idx], mclk_idx);
+ clks[MPC512x_CLK_SDHC] = mpc512x_clk_gated("sdhc", "sdhc-ug",
+ &clkregs->sccr2, 24);
+ /* there is only one SPDIF component, which shares MCLK support code */
+ if (soc_has_spdif()) {
+ clks[MPC512x_CLK_SPDIF] = mpc512x_clk_gated(
+ "spdif", "ips", &clkregs->sccr2, 23);
+ mpc512x_clk_setup_mclk(&mclk_spdif_data[0], 0);
+ }
+ if (soc_has_mbx()) {
+ clks[MPC512x_CLK_MBX_BUS] = mpc512x_clk_gated(
+ "mbx-bus", "mbx-bus-ug", &clkregs->sccr2, 22);
+ clks[MPC512x_CLK_MBX] = mpc512x_clk_gated(
+ "mbx", "mbx-ug", &clkregs->sccr2, 21);
+ clks[MPC512x_CLK_MBX_3D] = mpc512x_clk_gated(
+ "mbx-3d", "mbx-3d-ug", &clkregs->sccr2, 20);
+ }
+ clks[MPC512x_CLK_IIM] = mpc512x_clk_gated("iim", "csb",
+ &clkregs->sccr2, 19);
+ if (soc_has_viu()) {
+ clks[MPC512x_CLK_VIU] = mpc512x_clk_gated(
+ "viu", "csb", &clkregs->sccr2, 18);
+ }
+ if (soc_has_sdhc2()) {
+ clks[MPC512x_CLK_SDHC2] = mpc512x_clk_gated(
+ "sdhc-2", "sdhc2-ug", &clkregs->sccr2, 17);
+ }
+
+ if (soc_has_outclk()) {
+ size_t idx; /* used as mclk_idx, just to trim line length */
+ for (idx = 0; idx < ARRAY_SIZE(mclk_outclk_data); idx++)
+ mpc512x_clk_setup_mclk(&mclk_outclk_data[idx], idx);
+ }
+
+ /*
+ * externally provided clocks (when implemented in hardware,
+ * device tree may specify values which otherwise were unknown)
+ */
+ freq = get_freq_from_dt("psc_mclk_in");
+ if (!freq)
+ freq = 25000000;
+ clks[MPC512x_CLK_PSC_MCLK_IN] = mpc512x_clk_fixed("psc_mclk_in", freq);
+ if (soc_has_mclk_mux0_canin()) {
+ freq = get_freq_from_dt("can_clk_in");
+ clks[MPC512x_CLK_CAN_CLK_IN] = mpc512x_clk_fixed(
+ "can_clk_in", freq);
+ } else {
+ freq = get_freq_from_dt("spdif_tx_in");
+ clks[MPC512x_CLK_SPDIF_TX_IN] = mpc512x_clk_fixed(
+ "spdif_tx_in", freq);
+ freq = get_freq_from_dt("spdif_rx_in");
+ clks[MPC512x_CLK_SPDIF_TX_IN] = mpc512x_clk_fixed(
+ "spdif_rx_in", freq);
+ }
+
+ /* fixed frequency for AC97, always 24.567MHz */
+ clks[MPC512x_CLK_AC97] = mpc512x_clk_fixed("ac97", 24567000);
+
+ /*
+ * pre-enable those "internal" clock items which never get
+ * claimed by any peripheral driver, to not have the clock
+ * subsystem disable them late at startup
+ */
+ clk_prepare_enable(clks[MPC512x_CLK_DUMMY]);
+ clk_prepare_enable(clks[MPC512x_CLK_E300]); /* PowerPC CPU */
+ clk_prepare_enable(clks[MPC512x_CLK_DDR]); /* DRAM */
+ clk_prepare_enable(clks[MPC512x_CLK_MEM]); /* SRAM */
+ clk_prepare_enable(clks[MPC512x_CLK_IPS]); /* SoC periph */
+ clk_prepare_enable(clks[MPC512x_CLK_LPC]); /* boot media */
+}
+
+/*
+ * registers the set of public clocks (those listed in the dt-bindings/
+ * header file) for OF lookups, keeps the intermediates private to us
+ */
+static void __init mpc5121_clk_register_of_provider(struct device_node *np)
+{
+ clk_data.clks = clks;
+ clk_data.clk_num = MPC512x_CLK_LAST_PUBLIC + 1; /* _not_ ARRAY_SIZE() */
+ of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
+}
+
+/*
+ * temporary support for the period of time between introduction of CCF
+ * support and the adjustment of peripheral drivers to OF based lookups
+ */
+static void __init mpc5121_clk_provide_migration_support(void)
+{
+ struct device_node *np;
+ /*
+ * pre-enable those clock items which are not yet appropriately
+ * acquired by their peripheral driver
+ *
+ * the PCI clock cannot get acquired by its peripheral driver,
+ * because for this platform the driver won't probe(), instead
+ * initialization is done from within the .setup_arch() routine
+ * at a point in time where the clock provider has not been
+ * setup yet and thus isn't available yet
+ *
+ * so we "pre-enable" the clock here, to not have the clock
+ * subsystem automatically disable this item in a late init call
+ *
+ * this PCI clock pre-enable workaround only applies when there
+ * are device tree nodes for PCI and thus the peripheral driver
+ * has attached to bridges, otherwise the PCI clock remains
+ * unused and so it gets disabled
+ */
+ clk_prepare_enable(clks[MPC512x_CLK_PSC3_MCLK]);/* serial console */
+ np = of_find_compatible_node(NULL, "pci", "fsl,mpc5121-pci");
+ of_node_put(np);
+ if (np)
+ clk_prepare_enable(clks[MPC512x_CLK_PCI]);
+}
+
+/*
+ * those macros are not exactly pretty, but they encapsulate a lot
+ * of copy'n'paste heavy code which is even more ugly, and reduce
+ * the potential for inconsistencies in those many code copies
+ */
+#define FOR_NODES(compatname) \
+ for_each_compatible_node(np, NULL, compatname)
+
+#define NODE_PREP do { \
+ of_address_to_resource(np, 0, &res); \
+ snprintf(devname, sizeof(devname), "%pa.%s", &res.start, np->name); \
+} while (0)
+
+#define NODE_CHK(clkname, clkitem, regnode, regflag) do { \
+ struct clk *clk; \
+ clk = of_clk_get_by_name(np, clkname); \
+ if (IS_ERR(clk)) { \
+ clk = clkitem; \
+ clk_register_clkdev(clk, clkname, devname); \
+ if (regnode) \
+ clk_register_clkdev(clk, clkname, np->name); \
+ did_register |= DID_REG_ ## regflag; \
+ pr_debug("clock alias name '%s' for dev '%s' pointer %p\n", \
+ clkname, devname, clk); \
+ } else { \
+ clk_put(clk); \
+ } \
+} while (0)
+
+/*
+ * register source code provided fallback results for clock lookups,
+ * these get consulted when OF based clock lookup fails (that is in the
+ * case of not yet adjusted device tree data, where clock related specs
+ * are missing)
+ */
+static void __init mpc5121_clk_provide_backwards_compat(void)
+{
+ enum did_reg_flags {
+ DID_REG_PSC = BIT(0),
+ DID_REG_PSCFIFO = BIT(1),
+ DID_REG_NFC = BIT(2),
+ DID_REG_CAN = BIT(3),
+ DID_REG_I2C = BIT(4),
+ DID_REG_DIU = BIT(5),
+ DID_REG_VIU = BIT(6),
+ DID_REG_FEC = BIT(7),
+ DID_REG_USB = BIT(8),
+ DID_REG_PATA = BIT(9),
+ };
+
+ int did_register;
+ struct device_node *np;
+ struct resource res;
+ int idx;
+ char devname[32];
+
+ did_register = 0;
+
+ FOR_NODES(mpc512x_select_psc_compat()) {
+ NODE_PREP;
+ idx = (res.start >> 8) & 0xf;
+ NODE_CHK("ipg", clks[MPC512x_CLK_PSC0 + idx], 0, PSC);
+ NODE_CHK("mclk", clks[MPC512x_CLK_PSC0_MCLK + idx], 0, PSC);
+ }
+
+ FOR_NODES("fsl,mpc5121-psc-fifo") {
+ NODE_PREP;
+ NODE_CHK("ipg", clks[MPC512x_CLK_PSC_FIFO], 1, PSCFIFO);
+ }
+
+ FOR_NODES("fsl,mpc5121-nfc") {
+ NODE_PREP;
+ NODE_CHK("ipg", clks[MPC512x_CLK_NFC], 0, NFC);
+ }
+
+ FOR_NODES("fsl,mpc5121-mscan") {
+ NODE_PREP;
+ idx = 0;
+ idx += (res.start & 0x2000) ? 2 : 0;
+ idx += (res.start & 0x0080) ? 1 : 0;
+ NODE_CHK("ipg", clks[MPC512x_CLK_BDLC], 0, CAN);
+ NODE_CHK("mclk", clks[MPC512x_CLK_MSCAN0_MCLK + idx], 0, CAN);
+ }
+
+ /*
+ * do register the 'ips', 'sys', and 'ref' names globally
+ * instead of inside each individual CAN node, as there is no
+ * potential for a name conflict (in contrast to 'ipg' and 'mclk')
+ */
+ if (did_register & DID_REG_CAN) {
+ clk_register_clkdev(clks[MPC512x_CLK_IPS], "ips", NULL);
+ clk_register_clkdev(clks[MPC512x_CLK_SYS], "sys", NULL);
+ clk_register_clkdev(clks[MPC512x_CLK_REF], "ref", NULL);
+ }
+
+ FOR_NODES("fsl,mpc5121-i2c") {
+ NODE_PREP;
+ NODE_CHK("ipg", clks[MPC512x_CLK_I2C], 0, I2C);
+ }
+
+ /*
+ * workaround for the fact that the I2C driver does an "anonymous"
+ * lookup (NULL name spec, which yields the first clock spec) for
+ * which we cannot register an alias -- a _global_ 'ipg' alias that
+ * is not bound to any device name and returns the I2C clock item
+ * is not a good idea
+ *
+ * so we have the lookup in the peripheral driver fail, which is
+ * silent and non-fatal, and pre-enable the clock item here such
+ * that register access is possible
+ *
+ * see commit b3bfce2b "i2c: mpc: cleanup clock API use" for
+ * details, adjusting s/NULL/"ipg"/ in i2c-mpc.c would make this
+ * workaround obsolete
+ */
+ if (did_register & DID_REG_I2C)
+ clk_prepare_enable(clks[MPC512x_CLK_I2C]);
+
+ FOR_NODES("fsl,mpc5121-diu") {
+ NODE_PREP;
+ NODE_CHK("ipg", clks[MPC512x_CLK_DIU], 1, DIU);
+ }
+
+ FOR_NODES("fsl,mpc5121-viu") {
+ NODE_PREP;
+ NODE_CHK("ipg", clks[MPC512x_CLK_VIU], 0, VIU);
+ }
+
+ /*
+ * note that 2771399a "fs_enet: cleanup clock API use" did use the
+ * "per" string for the clock lookup in contrast to the "ipg" name
+ * which most other nodes are using -- this is not a fatal thing
+ * but just something to keep in mind when doing compatibility
+ * registration, it's a non-issue with up-to-date device tree data
+ */
+ FOR_NODES("fsl,mpc5121-fec") {
+ NODE_PREP;
+ NODE_CHK("per", clks[MPC512x_CLK_FEC], 0, FEC);
+ }
+ FOR_NODES("fsl,mpc5121-fec-mdio") {
+ NODE_PREP;
+ NODE_CHK("per", clks[MPC512x_CLK_FEC], 0, FEC);
+ }
+ /*
+ * MPC5125 has two FECs: FEC1 at 0x2800, FEC2 at 0x4800;
+ * the clock items don't "form an array" since FEC2 was
+ * added only later and was not allowed to shift all other
+ * clock item indices, so the numbers aren't adjacent
+ */
+ FOR_NODES("fsl,mpc5125-fec") {
+ NODE_PREP;
+ if (res.start & 0x4000)
+ idx = MPC512x_CLK_FEC2;
+ else
+ idx = MPC512x_CLK_FEC;
+ NODE_CHK("per", clks[idx], 0, FEC);
+ }
+
+ FOR_NODES("fsl,mpc5121-usb2-dr") {
+ NODE_PREP;
+ idx = (res.start & 0x4000) ? 1 : 0;
+ NODE_CHK("ipg", clks[MPC512x_CLK_USB1 + idx], 0, USB);
+ }
+
+ FOR_NODES("fsl,mpc5121-pata") {
+ NODE_PREP;
+ NODE_CHK("ipg", clks[MPC512x_CLK_PATA], 0, PATA);
+ }
+
+ /*
+ * try to collapse diagnostics into a single line of output yet
+ * provide a full list of what is missing, to avoid noise in the
+ * absence of up-to-date device tree data -- backwards
+ * compatibility to old DTBs is a requirement, updates may be
+ * desirable or preferrable but are not at all mandatory
+ */
+ if (did_register) {
+ pr_notice("device tree lacks clock specs, adding fallbacks (0x%x,%s%s%s%s%s%s%s%s%s%s)\n",
+ did_register,
+ (did_register & DID_REG_PSC) ? " PSC" : "",
+ (did_register & DID_REG_PSCFIFO) ? " PSCFIFO" : "",
+ (did_register & DID_REG_NFC) ? " NFC" : "",
+ (did_register & DID_REG_CAN) ? " CAN" : "",
+ (did_register & DID_REG_I2C) ? " I2C" : "",
+ (did_register & DID_REG_DIU) ? " DIU" : "",
+ (did_register & DID_REG_VIU) ? " VIU" : "",
+ (did_register & DID_REG_FEC) ? " FEC" : "",
+ (did_register & DID_REG_USB) ? " USB" : "",
+ (did_register & DID_REG_PATA) ? " PATA" : "");
+ } else {
+ pr_debug("device tree has clock specs, no fallbacks added\n");
+ }
+}
+
+/*
+ * The "fixed-clock" nodes (which includes the oscillator node if the board's
+ * DT provides one) has already been scanned by the of_clk_init() in
+ * time_init().
+ */
+int __init mpc5121_clk_init(void)
+{
+ struct device_node *clk_np;
+ int busfreq;
+
+ /* map the clock control registers */
+ clk_np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-clock");
+ if (!clk_np)
+ return -ENODEV;
+ clkregs = of_iomap(clk_np, 0);
+ WARN_ON(!clkregs);
+
+ /* determine the SoC variant we run on */
+ mpc512x_clk_determine_soc();
+
+ /* invalidate all not yet registered clock slots */
+ mpc512x_clk_preset_data();
+
+ /*
+ * add a dummy clock for those situations where a clock spec is
+ * required yet no real clock is involved
+ */
+ clks[MPC512x_CLK_DUMMY] = mpc512x_clk_fixed("dummy", 0);
+
+ /*
+ * have all the real nodes in the clock tree populated from REF
+ * down to all leaves, either starting from the OSC node or from
+ * a REF root that was created from the IPS bus clock input
+ */
+ busfreq = get_freq_from_dt("bus-frequency");
+ mpc512x_clk_setup_clock_tree(clk_np, busfreq);
+
+ /* register as an OF clock provider */
+ mpc5121_clk_register_of_provider(clk_np);
+
+ of_node_put(clk_np);
+
+ /*
+ * unbreak not yet adjusted peripheral drivers during migration
+ * towards fully operational common clock support, and allow
+ * operation in the absence of clock related device tree specs
+ */
+ mpc5121_clk_provide_migration_support();
+ mpc5121_clk_provide_backwards_compat();
+
+ return 0;
+}
diff --git a/arch/powerpc/platforms/512x/mpc5121_ads.c b/arch/powerpc/platforms/512x/mpc5121_ads.c
new file mode 100644
index 0000000000..a18f85b3ef
--- /dev/null
+++ b/arch/powerpc/platforms/512x/mpc5121_ads.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2007, 2008 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Author: John Rigby, <jrigby@freescale.com>, Thur Mar 29 2007
+ *
+ * Description:
+ * MPC5121 ADS board setup
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/of.h>
+
+#include <asm/machdep.h>
+#include <asm/ipic.h>
+#include <asm/time.h>
+
+#include <sysdev/fsl_pci.h>
+
+#include "mpc512x.h"
+#include "mpc5121_ads.h"
+
+static void __init mpc5121_ads_setup_arch(void)
+{
+ printk(KERN_INFO "MPC5121 ADS board from Freescale Semiconductor\n");
+ /*
+ * cpld regs are needed early
+ */
+ mpc5121_ads_cpld_map();
+
+ mpc512x_setup_arch();
+}
+
+static void __init mpc5121_ads_setup_pci(void)
+{
+#ifdef CONFIG_PCI
+ struct device_node *np;
+
+ for_each_compatible_node(np, "pci", "fsl,mpc5121-pci")
+ mpc83xx_add_bridge(np);
+#endif
+}
+
+static void __init mpc5121_ads_init_IRQ(void)
+{
+ mpc512x_init_IRQ();
+ mpc5121_ads_cpld_pic_init();
+}
+
+/*
+ * Called very early, MMU is off, device-tree isn't unflattened
+ */
+static int __init mpc5121_ads_probe(void)
+{
+ mpc512x_init_early();
+
+ return 1;
+}
+
+define_machine(mpc5121_ads) {
+ .name = "MPC5121 ADS",
+ .compatible = "fsl,mpc5121ads",
+ .probe = mpc5121_ads_probe,
+ .setup_arch = mpc5121_ads_setup_arch,
+ .discover_phbs = mpc5121_ads_setup_pci,
+ .init = mpc512x_init,
+ .init_IRQ = mpc5121_ads_init_IRQ,
+ .get_irq = ipic_get_irq,
+ .restart = mpc512x_restart,
+};
diff --git a/arch/powerpc/platforms/512x/mpc5121_ads.h b/arch/powerpc/platforms/512x/mpc5121_ads.h
new file mode 100644
index 0000000000..c88dea828c
--- /dev/null
+++ b/arch/powerpc/platforms/512x/mpc5121_ads.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2008 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Prototypes for ADS5121 specific code
+ */
+
+#ifndef __MPC512ADS_H__
+#define __MPC512ADS_H__
+extern void __init mpc5121_ads_cpld_map(void);
+extern void __init mpc5121_ads_cpld_pic_init(void);
+#endif /* __MPC512ADS_H__ */
diff --git a/arch/powerpc/platforms/512x/mpc5121_ads_cpld.c b/arch/powerpc/platforms/512x/mpc5121_ads_cpld.c
new file mode 100644
index 0000000000..6f08d07aee
--- /dev/null
+++ b/arch/powerpc/platforms/512x/mpc5121_ads_cpld.c
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2008 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Author: John Rigby, <jrigby@freescale.com>
+ *
+ * Description:
+ * MPC5121ADS CPLD irq handling
+ */
+
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
+static struct device_node *cpld_pic_node;
+static struct irq_domain *cpld_pic_host;
+
+/*
+ * Bits to ignore in the misc_status register
+ * 0x10 touch screen pendown is hard routed to irq1
+ * 0x02 pci status is read from pci status register
+ */
+#define MISC_IGNORE 0x12
+
+/*
+ * Nothing to ignore in pci status register
+ */
+#define PCI_IGNORE 0x00
+
+struct cpld_pic {
+ u8 pci_mask;
+ u8 pci_status;
+ u8 route;
+ u8 misc_mask;
+ u8 misc_status;
+ u8 misc_control;
+};
+
+static struct cpld_pic __iomem *cpld_regs;
+
+static void __iomem *
+irq_to_pic_mask(unsigned int irq)
+{
+ return irq <= 7 ? &cpld_regs->pci_mask : &cpld_regs->misc_mask;
+}
+
+static unsigned int
+irq_to_pic_bit(unsigned int irq)
+{
+ return 1 << (irq & 0x7);
+}
+
+static void
+cpld_mask_irq(struct irq_data *d)
+{
+ unsigned int cpld_irq = (unsigned int)irqd_to_hwirq(d);
+ void __iomem *pic_mask = irq_to_pic_mask(cpld_irq);
+
+ out_8(pic_mask,
+ in_8(pic_mask) | irq_to_pic_bit(cpld_irq));
+}
+
+static void
+cpld_unmask_irq(struct irq_data *d)
+{
+ unsigned int cpld_irq = (unsigned int)irqd_to_hwirq(d);
+ void __iomem *pic_mask = irq_to_pic_mask(cpld_irq);
+
+ out_8(pic_mask,
+ in_8(pic_mask) & ~irq_to_pic_bit(cpld_irq));
+}
+
+static struct irq_chip cpld_pic = {
+ .name = "CPLD PIC",
+ .irq_mask = cpld_mask_irq,
+ .irq_ack = cpld_mask_irq,
+ .irq_unmask = cpld_unmask_irq,
+};
+
+static unsigned int
+cpld_pic_get_irq(int offset, u8 ignore, u8 __iomem *statusp,
+ u8 __iomem *maskp)
+{
+ u8 status = in_8(statusp);
+ u8 mask = in_8(maskp);
+
+ /* ignore don't cares and masked irqs */
+ status |= (ignore | mask);
+
+ if (status == 0xff)
+ return ~0;
+
+ return ffz(status) + offset;
+}
+
+static void cpld_pic_cascade(struct irq_desc *desc)
+{
+ unsigned int hwirq;
+
+ hwirq = cpld_pic_get_irq(0, PCI_IGNORE, &cpld_regs->pci_status,
+ &cpld_regs->pci_mask);
+ if (hwirq != ~0) {
+ generic_handle_domain_irq(cpld_pic_host, hwirq);
+ return;
+ }
+
+ hwirq = cpld_pic_get_irq(8, MISC_IGNORE, &cpld_regs->misc_status,
+ &cpld_regs->misc_mask);
+ if (hwirq != ~0) {
+ generic_handle_domain_irq(cpld_pic_host, hwirq);
+ return;
+ }
+}
+
+static int
+cpld_pic_host_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
+{
+ return cpld_pic_node == node;
+}
+
+static int
+cpld_pic_host_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ irq_set_status_flags(virq, IRQ_LEVEL);
+ irq_set_chip_and_handler(virq, &cpld_pic, handle_level_irq);
+ return 0;
+}
+
+static const struct irq_domain_ops cpld_pic_host_ops = {
+ .match = cpld_pic_host_match,
+ .map = cpld_pic_host_map,
+};
+
+void __init
+mpc5121_ads_cpld_map(void)
+{
+ struct device_node *np = NULL;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121ads-cpld-pic");
+ if (!np) {
+ printk(KERN_ERR "CPLD PIC init: can not find cpld-pic node\n");
+ return;
+ }
+
+ cpld_regs = of_iomap(np, 0);
+ of_node_put(np);
+}
+
+void __init
+mpc5121_ads_cpld_pic_init(void)
+{
+ unsigned int cascade_irq;
+ struct device_node *np = NULL;
+
+ pr_debug("cpld_ic_init\n");
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121ads-cpld-pic");
+ if (!np) {
+ printk(KERN_ERR "CPLD PIC init: can not find cpld-pic node\n");
+ return;
+ }
+
+ if (!cpld_regs)
+ goto end;
+
+ cascade_irq = irq_of_parse_and_map(np, 0);
+ if (!cascade_irq)
+ goto end;
+
+ /*
+ * statically route touch screen pendown through 1
+ * and ignore it here
+ * route all others through our cascade irq
+ */
+ out_8(&cpld_regs->route, 0xfd);
+ out_8(&cpld_regs->pci_mask, 0xff);
+ /* unmask pci ints in misc mask */
+ out_8(&cpld_regs->misc_mask, ~(MISC_IGNORE));
+
+ cpld_pic_node = of_node_get(np);
+
+ cpld_pic_host = irq_domain_add_linear(np, 16, &cpld_pic_host_ops, NULL);
+ if (!cpld_pic_host) {
+ printk(KERN_ERR "CPLD PIC: failed to allocate irq host!\n");
+ goto end;
+ }
+
+ irq_set_chained_handler(cascade_irq, cpld_pic_cascade);
+end:
+ of_node_put(np);
+}
diff --git a/arch/powerpc/platforms/512x/mpc512x.h b/arch/powerpc/platforms/512x/mpc512x.h
new file mode 100644
index 0000000000..d2cb06e3a4
--- /dev/null
+++ b/arch/powerpc/platforms/512x/mpc512x.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Prototypes for MPC512x shared code
+ */
+
+#ifndef __MPC512X_H__
+#define __MPC512X_H__
+extern void __init mpc512x_init_IRQ(void);
+extern void __init mpc512x_init_early(void);
+extern void __init mpc512x_init(void);
+extern void __init mpc512x_setup_arch(void);
+extern int __init mpc5121_clk_init(void);
+const char *__init mpc512x_select_psc_compat(void);
+extern void __noreturn mpc512x_restart(char *cmd);
+
+#endif /* __MPC512X_H__ */
diff --git a/arch/powerpc/platforms/512x/mpc512x_generic.c b/arch/powerpc/platforms/512x/mpc512x_generic.c
new file mode 100644
index 0000000000..0d58ab257c
--- /dev/null
+++ b/arch/powerpc/platforms/512x/mpc512x_generic.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2007,2008 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Author: John Rigby, <jrigby@freescale.com>
+ *
+ * Description:
+ * MPC512x SoC setup
+ */
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+
+#include <asm/machdep.h>
+#include <asm/ipic.h>
+#include <asm/time.h>
+
+#include "mpc512x.h"
+
+/*
+ * list of supported boards
+ */
+static const char * const board[] __initconst = {
+ "prt,prtlvt",
+ "fsl,mpc5125ads",
+ "ifm,ac14xx",
+ NULL
+};
+
+/*
+ * Called very early, MMU is off, device-tree isn't unflattened
+ */
+static int __init mpc512x_generic_probe(void)
+{
+ if (!of_device_compatible_match(of_root, board))
+ return 0;
+
+ mpc512x_init_early();
+
+ return 1;
+}
+
+define_machine(mpc512x_generic) {
+ .name = "MPC512x generic",
+ .probe = mpc512x_generic_probe,
+ .init = mpc512x_init,
+ .setup_arch = mpc512x_setup_arch,
+ .init_IRQ = mpc512x_init_IRQ,
+ .get_irq = ipic_get_irq,
+ .restart = mpc512x_restart,
+};
diff --git a/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c b/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
new file mode 100644
index 0000000000..4a25b6b486
--- /dev/null
+++ b/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
@@ -0,0 +1,518 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * The driver for Freescale MPC512x LocalPlus Bus FIFO
+ * (called SCLPC in the Reference Manual).
+ *
+ * Copyright (C) 2013-2015 Alexander Popov <alex.popov@linux.com>.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <asm/mpc5121.h>
+#include <asm/io.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-direction.h>
+#include <linux/dma-mapping.h>
+
+#define DRV_NAME "mpc512x_lpbfifo"
+
+struct cs_range {
+ u32 csnum;
+ u32 base; /* must be zero */
+ u32 addr;
+ u32 size;
+};
+
+static struct lpbfifo_data {
+ spinlock_t lock; /* for protecting lpbfifo_data */
+ phys_addr_t regs_phys;
+ resource_size_t regs_size;
+ struct mpc512x_lpbfifo __iomem *regs;
+ int irq;
+ struct cs_range *cs_ranges;
+ size_t cs_n;
+ struct dma_chan *chan;
+ struct mpc512x_lpbfifo_request *req;
+ dma_addr_t ram_bus_addr;
+ bool wait_lpbfifo_irq;
+ bool wait_lpbfifo_callback;
+} lpbfifo;
+
+/*
+ * A data transfer from RAM to some device on LPB is finished
+ * when both mpc512x_lpbfifo_irq() and mpc512x_lpbfifo_callback()
+ * have been called. We execute the callback registered in
+ * mpc512x_lpbfifo_request just after that.
+ * But for a data transfer from some device on LPB to RAM we don't enable
+ * LPBFIFO interrupt because clearing MPC512X_SCLPC_SUCCESS interrupt flag
+ * automatically disables LPBFIFO reading request to the DMA controller
+ * and the data transfer hangs. So the callback registered in
+ * mpc512x_lpbfifo_request is executed at the end of mpc512x_lpbfifo_callback().
+ */
+
+/*
+ * mpc512x_lpbfifo_irq - IRQ handler for LPB FIFO
+ */
+static irqreturn_t mpc512x_lpbfifo_irq(int irq, void *param)
+{
+ struct device *dev = (struct device *)param;
+ struct mpc512x_lpbfifo_request *req = NULL;
+ unsigned long flags;
+ u32 status;
+
+ spin_lock_irqsave(&lpbfifo.lock, flags);
+
+ if (!lpbfifo.regs)
+ goto end;
+
+ req = lpbfifo.req;
+ if (!req || req->dir == MPC512X_LPBFIFO_REQ_DIR_READ) {
+ dev_err(dev, "bogus LPBFIFO IRQ\n");
+ goto end;
+ }
+
+ status = in_be32(&lpbfifo.regs->status);
+ if (status != MPC512X_SCLPC_SUCCESS) {
+ dev_err(dev, "DMA transfer from RAM to peripheral failed\n");
+ out_be32(&lpbfifo.regs->enable,
+ MPC512X_SCLPC_RESET | MPC512X_SCLPC_FIFO_RESET);
+ goto end;
+ }
+ /* Clear the interrupt flag */
+ out_be32(&lpbfifo.regs->status, MPC512X_SCLPC_SUCCESS);
+
+ lpbfifo.wait_lpbfifo_irq = false;
+
+ if (lpbfifo.wait_lpbfifo_callback)
+ goto end;
+
+ /* Transfer is finished, set the FIFO as idle */
+ lpbfifo.req = NULL;
+
+ spin_unlock_irqrestore(&lpbfifo.lock, flags);
+
+ if (req->callback)
+ req->callback(req);
+
+ return IRQ_HANDLED;
+
+ end:
+ spin_unlock_irqrestore(&lpbfifo.lock, flags);
+ return IRQ_HANDLED;
+}
+
+/*
+ * mpc512x_lpbfifo_callback is called by DMA driver when
+ * DMA transaction is finished.
+ */
+static void mpc512x_lpbfifo_callback(void *param)
+{
+ unsigned long flags;
+ struct mpc512x_lpbfifo_request *req = NULL;
+ enum dma_data_direction dir;
+
+ spin_lock_irqsave(&lpbfifo.lock, flags);
+
+ if (!lpbfifo.regs) {
+ spin_unlock_irqrestore(&lpbfifo.lock, flags);
+ return;
+ }
+
+ req = lpbfifo.req;
+ if (!req) {
+ pr_err("bogus LPBFIFO callback\n");
+ spin_unlock_irqrestore(&lpbfifo.lock, flags);
+ return;
+ }
+
+ /* Release the mapping */
+ if (req->dir == MPC512X_LPBFIFO_REQ_DIR_WRITE)
+ dir = DMA_TO_DEVICE;
+ else
+ dir = DMA_FROM_DEVICE;
+ dma_unmap_single(lpbfifo.chan->device->dev,
+ lpbfifo.ram_bus_addr, req->size, dir);
+
+ lpbfifo.wait_lpbfifo_callback = false;
+
+ if (!lpbfifo.wait_lpbfifo_irq) {
+ /* Transfer is finished, set the FIFO as idle */
+ lpbfifo.req = NULL;
+
+ spin_unlock_irqrestore(&lpbfifo.lock, flags);
+
+ if (req->callback)
+ req->callback(req);
+ } else {
+ spin_unlock_irqrestore(&lpbfifo.lock, flags);
+ }
+}
+
+static int mpc512x_lpbfifo_kick(void)
+{
+ u32 bits;
+ bool no_incr = false;
+ u32 bpt = 32; /* max bytes per LPBFIFO transaction involving DMA */
+ u32 cs = 0;
+ size_t i;
+ struct dma_device *dma_dev = NULL;
+ struct scatterlist sg;
+ enum dma_data_direction dir;
+ struct dma_slave_config dma_conf = {};
+ struct dma_async_tx_descriptor *dma_tx = NULL;
+ dma_cookie_t cookie;
+ int ret;
+
+ /*
+ * 1. Fit the requirements:
+ * - the packet size must be a multiple of 4 since FIFO Data Word
+ * Register allows only full-word access according the Reference
+ * Manual;
+ * - the physical address of the device on LPB and the packet size
+ * must be aligned on BPT (bytes per transaction) or 8-bytes
+ * boundary according the Reference Manual;
+ * - but we choose DMA maxburst equal (or very close to) BPT to prevent
+ * DMA controller from overtaking FIFO and causing FIFO underflow
+ * error. So we force the packet size to be aligned on BPT boundary
+ * not to confuse DMA driver which requires the packet size to be
+ * aligned on maxburst boundary;
+ * - BPT should be set to the LPB device port size for operation with
+ * disabled auto-incrementing according Reference Manual.
+ */
+ if (lpbfifo.req->size == 0 || !IS_ALIGNED(lpbfifo.req->size, 4))
+ return -EINVAL;
+
+ if (lpbfifo.req->portsize != LPB_DEV_PORTSIZE_UNDEFINED) {
+ bpt = lpbfifo.req->portsize;
+ no_incr = true;
+ }
+
+ while (bpt > 1) {
+ if (IS_ALIGNED(lpbfifo.req->dev_phys_addr, min(bpt, 0x8u)) &&
+ IS_ALIGNED(lpbfifo.req->size, bpt)) {
+ break;
+ }
+
+ if (no_incr)
+ return -EINVAL;
+
+ bpt >>= 1;
+ }
+ dma_conf.dst_maxburst = max(bpt, 0x4u) / 4;
+ dma_conf.src_maxburst = max(bpt, 0x4u) / 4;
+
+ for (i = 0; i < lpbfifo.cs_n; i++) {
+ phys_addr_t cs_start = lpbfifo.cs_ranges[i].addr;
+ phys_addr_t cs_end = cs_start + lpbfifo.cs_ranges[i].size;
+ phys_addr_t access_start = lpbfifo.req->dev_phys_addr;
+ phys_addr_t access_end = access_start + lpbfifo.req->size;
+
+ if (access_start >= cs_start && access_end <= cs_end) {
+ cs = lpbfifo.cs_ranges[i].csnum;
+ break;
+ }
+ }
+ if (i == lpbfifo.cs_n)
+ return -EFAULT;
+
+ /* 2. Prepare DMA */
+ dma_dev = lpbfifo.chan->device;
+
+ if (lpbfifo.req->dir == MPC512X_LPBFIFO_REQ_DIR_WRITE) {
+ dir = DMA_TO_DEVICE;
+ dma_conf.direction = DMA_MEM_TO_DEV;
+ dma_conf.dst_addr = lpbfifo.regs_phys +
+ offsetof(struct mpc512x_lpbfifo, data_word);
+ } else {
+ dir = DMA_FROM_DEVICE;
+ dma_conf.direction = DMA_DEV_TO_MEM;
+ dma_conf.src_addr = lpbfifo.regs_phys +
+ offsetof(struct mpc512x_lpbfifo, data_word);
+ }
+ dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+
+ /* Make DMA channel work with LPB FIFO data register */
+ if (dma_dev->device_config(lpbfifo.chan, &dma_conf)) {
+ ret = -EINVAL;
+ goto err_dma_prep;
+ }
+
+ sg_init_table(&sg, 1);
+
+ sg_dma_address(&sg) = dma_map_single(dma_dev->dev,
+ lpbfifo.req->ram_virt_addr, lpbfifo.req->size, dir);
+ if (dma_mapping_error(dma_dev->dev, sg_dma_address(&sg)))
+ return -EFAULT;
+
+ lpbfifo.ram_bus_addr = sg_dma_address(&sg); /* For freeing later */
+
+ sg_dma_len(&sg) = lpbfifo.req->size;
+
+ dma_tx = dmaengine_prep_slave_sg(lpbfifo.chan, &sg,
+ 1, dma_conf.direction, 0);
+ if (!dma_tx) {
+ ret = -ENOSPC;
+ goto err_dma_prep;
+ }
+ dma_tx->callback = mpc512x_lpbfifo_callback;
+ dma_tx->callback_param = NULL;
+
+ /* 3. Prepare FIFO */
+ out_be32(&lpbfifo.regs->enable,
+ MPC512X_SCLPC_RESET | MPC512X_SCLPC_FIFO_RESET);
+ out_be32(&lpbfifo.regs->enable, 0x0);
+
+ /*
+ * Configure the watermarks for write operation (RAM->DMA->FIFO->dev):
+ * - high watermark 7 words according the Reference Manual,
+ * - low watermark 512 bytes (half of the FIFO).
+ * These watermarks don't work for read operation since the
+ * MPC512X_SCLPC_FLUSH bit is set (according the Reference Manual).
+ */
+ out_be32(&lpbfifo.regs->fifo_ctrl, MPC512X_SCLPC_FIFO_CTRL(0x7));
+ out_be32(&lpbfifo.regs->fifo_alarm, MPC512X_SCLPC_FIFO_ALARM(0x200));
+
+ /*
+ * Start address is a physical address of the region which belongs
+ * to the device on the LocalPlus Bus
+ */
+ out_be32(&lpbfifo.regs->start_addr, lpbfifo.req->dev_phys_addr);
+
+ /*
+ * Configure chip select, transfer direction, address increment option
+ * and bytes per transaction option
+ */
+ bits = MPC512X_SCLPC_CS(cs);
+ if (lpbfifo.req->dir == MPC512X_LPBFIFO_REQ_DIR_READ)
+ bits |= MPC512X_SCLPC_READ | MPC512X_SCLPC_FLUSH;
+ if (no_incr)
+ bits |= MPC512X_SCLPC_DAI;
+ bits |= MPC512X_SCLPC_BPT(bpt);
+ out_be32(&lpbfifo.regs->ctrl, bits);
+
+ /* Unmask irqs */
+ bits = MPC512X_SCLPC_ENABLE | MPC512X_SCLPC_ABORT_INT_ENABLE;
+ if (lpbfifo.req->dir == MPC512X_LPBFIFO_REQ_DIR_WRITE)
+ bits |= MPC512X_SCLPC_NORM_INT_ENABLE;
+ else
+ lpbfifo.wait_lpbfifo_irq = false;
+
+ out_be32(&lpbfifo.regs->enable, bits);
+
+ /* 4. Set packet size and kick FIFO off */
+ bits = lpbfifo.req->size | MPC512X_SCLPC_START;
+ out_be32(&lpbfifo.regs->pkt_size, bits);
+
+ /* 5. Finally kick DMA off */
+ cookie = dma_tx->tx_submit(dma_tx);
+ if (dma_submit_error(cookie)) {
+ ret = -ENOSPC;
+ goto err_dma_submit;
+ }
+
+ return 0;
+
+ err_dma_submit:
+ out_be32(&lpbfifo.regs->enable,
+ MPC512X_SCLPC_RESET | MPC512X_SCLPC_FIFO_RESET);
+ err_dma_prep:
+ dma_unmap_single(dma_dev->dev, sg_dma_address(&sg),
+ lpbfifo.req->size, dir);
+ return ret;
+}
+
+static int mpc512x_lpbfifo_submit_locked(struct mpc512x_lpbfifo_request *req)
+{
+ int ret = 0;
+
+ if (!lpbfifo.regs)
+ return -ENODEV;
+
+ /* Check whether a transfer is in progress */
+ if (lpbfifo.req)
+ return -EBUSY;
+
+ lpbfifo.wait_lpbfifo_irq = true;
+ lpbfifo.wait_lpbfifo_callback = true;
+ lpbfifo.req = req;
+
+ ret = mpc512x_lpbfifo_kick();
+ if (ret != 0)
+ lpbfifo.req = NULL; /* Set the FIFO as idle */
+
+ return ret;
+}
+
+int mpc512x_lpbfifo_submit(struct mpc512x_lpbfifo_request *req)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&lpbfifo.lock, flags);
+ ret = mpc512x_lpbfifo_submit_locked(req);
+ spin_unlock_irqrestore(&lpbfifo.lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(mpc512x_lpbfifo_submit);
+
+/*
+ * LPBFIFO driver uses "ranges" property of "localbus" device tree node
+ * for being able to determine the chip select number of a client device
+ * ordering a DMA transfer.
+ */
+static int get_cs_ranges(struct device *dev)
+{
+ int ret = -ENODEV;
+ struct device_node *lb_node;
+ size_t i = 0;
+ struct of_range_parser parser;
+ struct of_range range;
+
+ lb_node = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-localbus");
+ if (!lb_node)
+ return ret;
+
+ of_range_parser_init(&parser, lb_node);
+ lpbfifo.cs_n = of_range_count(&parser);
+
+ lpbfifo.cs_ranges = devm_kcalloc(dev, lpbfifo.cs_n,
+ sizeof(struct cs_range), GFP_KERNEL);
+ if (!lpbfifo.cs_ranges)
+ goto end;
+
+ for_each_of_range(&parser, &range) {
+ u32 base = lower_32_bits(range.bus_addr);
+ if (base)
+ goto end;
+
+ lpbfifo.cs_ranges[i].csnum = upper_32_bits(range.bus_addr);
+ lpbfifo.cs_ranges[i].base = base;
+ lpbfifo.cs_ranges[i].addr = range.cpu_addr;
+ lpbfifo.cs_ranges[i].size = range.size;
+ i++;
+ }
+
+ ret = 0;
+
+ end:
+ of_node_put(lb_node);
+ return ret;
+}
+
+static int mpc512x_lpbfifo_probe(struct platform_device *pdev)
+{
+ struct resource r;
+ int ret = 0;
+
+ memset(&lpbfifo, 0, sizeof(struct lpbfifo_data));
+ spin_lock_init(&lpbfifo.lock);
+
+ lpbfifo.chan = dma_request_chan(&pdev->dev, "rx-tx");
+ if (IS_ERR(lpbfifo.chan))
+ return PTR_ERR(lpbfifo.chan);
+
+ if (of_address_to_resource(pdev->dev.of_node, 0, &r) != 0) {
+ dev_err(&pdev->dev, "bad 'reg' in 'sclpc' device tree node\n");
+ ret = -ENODEV;
+ goto err0;
+ }
+
+ lpbfifo.regs_phys = r.start;
+ lpbfifo.regs_size = resource_size(&r);
+
+ if (!devm_request_mem_region(&pdev->dev, lpbfifo.regs_phys,
+ lpbfifo.regs_size, DRV_NAME)) {
+ dev_err(&pdev->dev, "unable to request region\n");
+ ret = -EBUSY;
+ goto err0;
+ }
+
+ lpbfifo.regs = devm_ioremap(&pdev->dev,
+ lpbfifo.regs_phys, lpbfifo.regs_size);
+ if (!lpbfifo.regs) {
+ dev_err(&pdev->dev, "mapping registers failed\n");
+ ret = -ENOMEM;
+ goto err0;
+ }
+
+ out_be32(&lpbfifo.regs->enable,
+ MPC512X_SCLPC_RESET | MPC512X_SCLPC_FIFO_RESET);
+
+ if (get_cs_ranges(&pdev->dev) != 0) {
+ dev_err(&pdev->dev, "bad '/localbus' device tree node\n");
+ ret = -ENODEV;
+ goto err0;
+ }
+
+ lpbfifo.irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
+ if (!lpbfifo.irq) {
+ dev_err(&pdev->dev, "mapping irq failed\n");
+ ret = -ENODEV;
+ goto err0;
+ }
+
+ if (request_irq(lpbfifo.irq, mpc512x_lpbfifo_irq, 0,
+ DRV_NAME, &pdev->dev) != 0) {
+ dev_err(&pdev->dev, "requesting irq failed\n");
+ ret = -ENODEV;
+ goto err1;
+ }
+
+ dev_info(&pdev->dev, "probe succeeded\n");
+ return 0;
+
+ err1:
+ irq_dispose_mapping(lpbfifo.irq);
+ err0:
+ dma_release_channel(lpbfifo.chan);
+ return ret;
+}
+
+static void mpc512x_lpbfifo_remove(struct platform_device *pdev)
+{
+ unsigned long flags;
+ struct dma_device *dma_dev = lpbfifo.chan->device;
+ struct mpc512x_lpbfifo __iomem *regs = NULL;
+
+ spin_lock_irqsave(&lpbfifo.lock, flags);
+ regs = lpbfifo.regs;
+ lpbfifo.regs = NULL;
+ spin_unlock_irqrestore(&lpbfifo.lock, flags);
+
+ dma_dev->device_terminate_all(lpbfifo.chan);
+ out_be32(&regs->enable, MPC512X_SCLPC_RESET | MPC512X_SCLPC_FIFO_RESET);
+
+ free_irq(lpbfifo.irq, &pdev->dev);
+ irq_dispose_mapping(lpbfifo.irq);
+ dma_release_channel(lpbfifo.chan);
+}
+
+static const struct of_device_id mpc512x_lpbfifo_match[] = {
+ { .compatible = "fsl,mpc512x-lpbfifo", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mpc512x_lpbfifo_match);
+
+static struct platform_driver mpc512x_lpbfifo_driver = {
+ .probe = mpc512x_lpbfifo_probe,
+ .remove_new = mpc512x_lpbfifo_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = mpc512x_lpbfifo_match,
+ },
+};
+
+module_platform_driver(mpc512x_lpbfifo_driver);
+
+MODULE_AUTHOR("Alexander Popov <alex.popov@linux.com>");
+MODULE_DESCRIPTION("MPC512x LocalPlus Bus FIFO device driver");
+MODULE_LICENSE("GPL v2");
diff --git a/arch/powerpc/platforms/512x/mpc512x_shared.c b/arch/powerpc/platforms/512x/mpc512x_shared.c
new file mode 100644
index 0000000000..8f75e9574c
--- /dev/null
+++ b/arch/powerpc/platforms/512x/mpc512x_shared.c
@@ -0,0 +1,506 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2007,2008 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Author: John Rigby <jrigby@freescale.com>
+ *
+ * Description:
+ * MPC512x Shared code
+ */
+
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/fsl-diu-fb.h>
+#include <linux/memblock.h>
+#include <sysdev/fsl_soc.h>
+
+#include <asm/cacheflush.h>
+#include <asm/machdep.h>
+#include <asm/ipic.h>
+#include <asm/time.h>
+#include <asm/mpc5121.h>
+#include <asm/mpc52xx_psc.h>
+
+#include "mpc512x.h"
+
+static struct mpc512x_reset_module __iomem *reset_module_base;
+
+void __noreturn mpc512x_restart(char *cmd)
+{
+ if (reset_module_base) {
+ /* Enable software reset "RSTE" */
+ out_be32(&reset_module_base->rpr, 0x52535445);
+ /* Set software hard reset */
+ out_be32(&reset_module_base->rcr, 0x2);
+ } else {
+ pr_err("Restart module not mapped.\n");
+ }
+ for (;;)
+ ;
+}
+
+struct fsl_diu_shared_fb {
+ u8 gamma[0x300]; /* 32-bit aligned! */
+ struct diu_ad ad0; /* 32-bit aligned! */
+ phys_addr_t fb_phys;
+ size_t fb_len;
+ bool in_use;
+};
+
+/* receives a pixel clock spec in pico seconds, adjusts the DIU clock rate */
+static void mpc512x_set_pixel_clock(unsigned int pixclock)
+{
+ struct device_node *np;
+ struct clk *clk_diu;
+ unsigned long epsilon, minpixclock, maxpixclock;
+ unsigned long offset, want, got, delta;
+
+ /* lookup and enable the DIU clock */
+ np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-diu");
+ if (!np) {
+ pr_err("Could not find DIU device tree node.\n");
+ return;
+ }
+ clk_diu = of_clk_get(np, 0);
+ if (IS_ERR(clk_diu)) {
+ /* backwards compat with device trees that lack clock specs */
+ clk_diu = clk_get_sys(np->name, "ipg");
+ }
+ of_node_put(np);
+ if (IS_ERR(clk_diu)) {
+ pr_err("Could not lookup DIU clock.\n");
+ return;
+ }
+ if (clk_prepare_enable(clk_diu)) {
+ pr_err("Could not enable DIU clock.\n");
+ return;
+ }
+
+ /*
+ * convert the picoseconds spec into the desired clock rate,
+ * determine the acceptable clock range for the monitor (+/- 5%),
+ * do the calculation in steps to avoid integer overflow
+ */
+ pr_debug("DIU pixclock in ps - %u\n", pixclock);
+ pixclock = (1000000000 / pixclock) * 1000;
+ pr_debug("DIU pixclock freq - %u\n", pixclock);
+ epsilon = pixclock / 20; /* pixclock * 0.05 */
+ pr_debug("DIU deviation - %lu\n", epsilon);
+ minpixclock = pixclock - epsilon;
+ maxpixclock = pixclock + epsilon;
+ pr_debug("DIU minpixclock - %lu\n", minpixclock);
+ pr_debug("DIU maxpixclock - %lu\n", maxpixclock);
+
+ /*
+ * check whether the DIU supports the desired pixel clock
+ *
+ * - simply request the desired clock and see what the
+ * platform's clock driver will make of it, assuming that it
+ * will setup the best approximation of the requested value
+ * - try other candidate frequencies in the order of decreasing
+ * preference (i.e. with increasing distance from the desired
+ * pixel clock, and checking the lower frequency before the
+ * higher frequency to not overload the hardware) until the
+ * first match is found -- any potential subsequent match
+ * would only be as good as the former match or typically
+ * would be less preferrable
+ *
+ * the offset increment of pixelclock divided by 64 is an
+ * arbitrary choice -- it's simple to calculate, in the typical
+ * case we expect the first check to succeed already, in the
+ * worst case seven frequencies get tested (the exact center and
+ * three more values each to the left and to the right) before
+ * the 5% tolerance window is exceeded, resulting in fast enough
+ * execution yet high enough probability of finding a suitable
+ * value, while the error rate will be in the order of single
+ * percents
+ */
+ for (offset = 0; offset <= epsilon; offset += pixclock / 64) {
+ want = pixclock - offset;
+ pr_debug("DIU checking clock - %lu\n", want);
+ clk_set_rate(clk_diu, want);
+ got = clk_get_rate(clk_diu);
+ delta = abs(pixclock - got);
+ if (delta < epsilon)
+ break;
+ if (!offset)
+ continue;
+ want = pixclock + offset;
+ pr_debug("DIU checking clock - %lu\n", want);
+ clk_set_rate(clk_diu, want);
+ got = clk_get_rate(clk_diu);
+ delta = abs(pixclock - got);
+ if (delta < epsilon)
+ break;
+ }
+ if (offset <= epsilon) {
+ pr_debug("DIU clock accepted - %lu\n", want);
+ pr_debug("DIU pixclock want %u, got %lu, delta %lu, eps %lu\n",
+ pixclock, got, delta, epsilon);
+ return;
+ }
+ pr_warn("DIU pixclock auto search unsuccessful\n");
+
+ /*
+ * what is the most appropriate action to take when the search
+ * for an available pixel clock which is acceptable to the
+ * monitor has failed? disable the DIU (clock) or just provide
+ * a "best effort"? we go with the latter
+ */
+ pr_warn("DIU pixclock best effort fallback (backend's choice)\n");
+ clk_set_rate(clk_diu, pixclock);
+ got = clk_get_rate(clk_diu);
+ delta = abs(pixclock - got);
+ pr_debug("DIU pixclock want %u, got %lu, delta %lu, eps %lu\n",
+ pixclock, got, delta, epsilon);
+}
+
+static enum fsl_diu_monitor_port
+mpc512x_valid_monitor_port(enum fsl_diu_monitor_port port)
+{
+ return FSL_DIU_PORT_DVI;
+}
+
+static struct fsl_diu_shared_fb __attribute__ ((__aligned__(8))) diu_shared_fb;
+
+static inline void mpc512x_free_bootmem(struct page *page)
+{
+ BUG_ON(PageTail(page));
+ BUG_ON(page_ref_count(page) > 1);
+ free_reserved_page(page);
+}
+
+static void mpc512x_release_bootmem(void)
+{
+ unsigned long addr = diu_shared_fb.fb_phys & PAGE_MASK;
+ unsigned long size = diu_shared_fb.fb_len;
+ unsigned long start, end;
+
+ if (diu_shared_fb.in_use) {
+ start = PFN_UP(addr);
+ end = PFN_DOWN(addr + size);
+
+ for (; start < end; start++)
+ mpc512x_free_bootmem(pfn_to_page(start));
+
+ diu_shared_fb.in_use = false;
+ }
+ diu_ops.release_bootmem = NULL;
+}
+
+/*
+ * Check if DIU was pre-initialized. If so, perform steps
+ * needed to continue displaying through the whole boot process.
+ * Move area descriptor and gamma table elsewhere, they are
+ * destroyed by bootmem allocator otherwise. The frame buffer
+ * address range will be reserved in setup_arch() after bootmem
+ * allocator is up.
+ */
+static void __init mpc512x_init_diu(void)
+{
+ struct device_node *np;
+ struct diu __iomem *diu_reg;
+ phys_addr_t desc;
+ void __iomem *vaddr;
+ unsigned long mode, pix_fmt, res, bpp;
+ unsigned long dst;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-diu");
+ if (!np) {
+ pr_err("No DIU node\n");
+ return;
+ }
+
+ diu_reg = of_iomap(np, 0);
+ of_node_put(np);
+ if (!diu_reg) {
+ pr_err("Can't map DIU\n");
+ return;
+ }
+
+ mode = in_be32(&diu_reg->diu_mode);
+ if (mode == MFB_MODE0) {
+ pr_info("%s: DIU OFF\n", __func__);
+ goto out;
+ }
+
+ desc = in_be32(&diu_reg->desc[0]);
+ vaddr = ioremap(desc, sizeof(struct diu_ad));
+ if (!vaddr) {
+ pr_err("Can't map DIU area desc.\n");
+ goto out;
+ }
+ memcpy(&diu_shared_fb.ad0, vaddr, sizeof(struct diu_ad));
+ /* flush fb area descriptor */
+ dst = (unsigned long)&diu_shared_fb.ad0;
+ flush_dcache_range(dst, dst + sizeof(struct diu_ad) - 1);
+
+ res = in_be32(&diu_reg->disp_size);
+ pix_fmt = in_le32(vaddr);
+ bpp = ((pix_fmt >> 16) & 0x3) + 1;
+ diu_shared_fb.fb_phys = in_le32(vaddr + 4);
+ diu_shared_fb.fb_len = ((res & 0xfff0000) >> 16) * (res & 0xfff) * bpp;
+ diu_shared_fb.in_use = true;
+ iounmap(vaddr);
+
+ desc = in_be32(&diu_reg->gamma);
+ vaddr = ioremap(desc, sizeof(diu_shared_fb.gamma));
+ if (!vaddr) {
+ pr_err("Can't map DIU area desc.\n");
+ diu_shared_fb.in_use = false;
+ goto out;
+ }
+ memcpy(&diu_shared_fb.gamma, vaddr, sizeof(diu_shared_fb.gamma));
+ /* flush gamma table */
+ dst = (unsigned long)&diu_shared_fb.gamma;
+ flush_dcache_range(dst, dst + sizeof(diu_shared_fb.gamma) - 1);
+
+ iounmap(vaddr);
+ out_be32(&diu_reg->gamma, virt_to_phys(&diu_shared_fb.gamma));
+ out_be32(&diu_reg->desc[1], 0);
+ out_be32(&diu_reg->desc[2], 0);
+ out_be32(&diu_reg->desc[0], virt_to_phys(&diu_shared_fb.ad0));
+
+out:
+ iounmap(diu_reg);
+}
+
+static void __init mpc512x_setup_diu(void)
+{
+ int ret;
+
+ /*
+ * We do not allocate and configure new area for bitmap buffer
+ * because it would require copying bitmap data (splash image)
+ * and so negatively affect boot time. Instead we reserve the
+ * already configured frame buffer area so that it won't be
+ * destroyed. The starting address of the area to reserve and
+ * also it's length is passed to memblock_reserve(). It will be
+ * freed later on first open of fbdev, when splash image is not
+ * needed any more.
+ */
+ if (diu_shared_fb.in_use) {
+ ret = memblock_reserve(diu_shared_fb.fb_phys,
+ diu_shared_fb.fb_len);
+ if (ret) {
+ pr_err("%s: reserve bootmem failed\n", __func__);
+ diu_shared_fb.in_use = false;
+ }
+ }
+
+ diu_ops.set_pixel_clock = mpc512x_set_pixel_clock;
+ diu_ops.valid_monitor_port = mpc512x_valid_monitor_port;
+ diu_ops.release_bootmem = mpc512x_release_bootmem;
+}
+
+void __init mpc512x_init_IRQ(void)
+{
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-ipic");
+ if (!np)
+ return;
+
+ ipic_init(np, 0);
+ of_node_put(np);
+
+ /*
+ * Initialize the default interrupt mapping priorities,
+ * in case the boot rom changed something on us.
+ */
+ ipic_set_default_priority();
+}
+
+/*
+ * Nodes to do bus probe on, soc and localbus
+ */
+static const struct of_device_id of_bus_ids[] __initconst = {
+ { .compatible = "fsl,mpc5121-immr", },
+ { .compatible = "fsl,mpc5121-localbus", },
+ { .compatible = "fsl,mpc5121-mbx", },
+ { .compatible = "fsl,mpc5121-nfc", },
+ { .compatible = "fsl,mpc5121-sram", },
+ { .compatible = "fsl,mpc5121-pci", },
+ { .compatible = "gpio-leds", },
+ {},
+};
+
+static void __init mpc512x_declare_of_platform_devices(void)
+{
+ if (of_platform_bus_probe(NULL, of_bus_ids, NULL))
+ printk(KERN_ERR __FILE__ ": "
+ "Error while probing of_platform bus\n");
+}
+
+#define DEFAULT_FIFO_SIZE 16
+
+const char *__init mpc512x_select_psc_compat(void)
+{
+ if (of_machine_is_compatible("fsl,mpc5121"))
+ return "fsl,mpc5121-psc";
+
+ if (of_machine_is_compatible("fsl,mpc5125"))
+ return "fsl,mpc5125-psc";
+
+ return NULL;
+}
+
+static const char *__init mpc512x_select_reset_compat(void)
+{
+ if (of_machine_is_compatible("fsl,mpc5121"))
+ return "fsl,mpc5121-reset";
+
+ if (of_machine_is_compatible("fsl,mpc5125"))
+ return "fsl,mpc5125-reset";
+
+ return NULL;
+}
+
+static unsigned int __init get_fifo_size(struct device_node *np,
+ char *prop_name)
+{
+ const unsigned int *fp;
+
+ fp = of_get_property(np, prop_name, NULL);
+ if (fp)
+ return *fp;
+
+ pr_warn("no %s property in %pOF node, defaulting to %d\n",
+ prop_name, np, DEFAULT_FIFO_SIZE);
+
+ return DEFAULT_FIFO_SIZE;
+}
+
+#define FIFOC(_base) ((struct mpc512x_psc_fifo __iomem *) \
+ ((u32)(_base) + sizeof(struct mpc52xx_psc)))
+
+/* Init PSC FIFO space for TX and RX slices */
+static void __init mpc512x_psc_fifo_init(void)
+{
+ struct device_node *np;
+ void __iomem *psc;
+ unsigned int tx_fifo_size;
+ unsigned int rx_fifo_size;
+ const char *psc_compat;
+ int fifobase = 0; /* current fifo address in 32 bit words */
+
+ psc_compat = mpc512x_select_psc_compat();
+ if (!psc_compat) {
+ pr_err("%s: no compatible devices found\n", __func__);
+ return;
+ }
+
+ for_each_compatible_node(np, NULL, psc_compat) {
+ tx_fifo_size = get_fifo_size(np, "fsl,tx-fifo-size");
+ rx_fifo_size = get_fifo_size(np, "fsl,rx-fifo-size");
+
+ /* size in register is in 4 byte units */
+ tx_fifo_size /= 4;
+ rx_fifo_size /= 4;
+ if (!tx_fifo_size)
+ tx_fifo_size = 1;
+ if (!rx_fifo_size)
+ rx_fifo_size = 1;
+
+ psc = of_iomap(np, 0);
+ if (!psc) {
+ pr_err("%s: Can't map %pOF device\n",
+ __func__, np);
+ continue;
+ }
+
+ /* FIFO space is 4KiB, check if requested size is available */
+ if ((fifobase + tx_fifo_size + rx_fifo_size) > 0x1000) {
+ pr_err("%s: no fifo space available for %pOF\n",
+ __func__, np);
+ iounmap(psc);
+ /*
+ * chances are that another device requests less
+ * fifo space, so we continue.
+ */
+ continue;
+ }
+
+ /* set tx and rx fifo size registers */
+ out_be32(&FIFOC(psc)->txsz, (fifobase << 16) | tx_fifo_size);
+ fifobase += tx_fifo_size;
+ out_be32(&FIFOC(psc)->rxsz, (fifobase << 16) | rx_fifo_size);
+ fifobase += rx_fifo_size;
+
+ /* reset and enable the slices */
+ out_be32(&FIFOC(psc)->txcmd, 0x80);
+ out_be32(&FIFOC(psc)->txcmd, 0x01);
+ out_be32(&FIFOC(psc)->rxcmd, 0x80);
+ out_be32(&FIFOC(psc)->rxcmd, 0x01);
+
+ iounmap(psc);
+ }
+}
+
+static void __init mpc512x_restart_init(void)
+{
+ struct device_node *np;
+ const char *reset_compat;
+
+ reset_compat = mpc512x_select_reset_compat();
+ np = of_find_compatible_node(NULL, NULL, reset_compat);
+ if (!np)
+ return;
+
+ reset_module_base = of_iomap(np, 0);
+ of_node_put(np);
+}
+
+void __init mpc512x_init_early(void)
+{
+ mpc512x_restart_init();
+ if (IS_ENABLED(CONFIG_FB_FSL_DIU))
+ mpc512x_init_diu();
+}
+
+void __init mpc512x_init(void)
+{
+ mpc5121_clk_init();
+ mpc512x_declare_of_platform_devices();
+ mpc512x_psc_fifo_init();
+}
+
+void __init mpc512x_setup_arch(void)
+{
+ if (IS_ENABLED(CONFIG_FB_FSL_DIU))
+ mpc512x_setup_diu();
+}
+
+/**
+ * mpc512x_cs_config - Setup chip select configuration
+ * @cs: chip select number
+ * @val: chip select configuration value
+ *
+ * Perform chip select configuration for devices on LocalPlus Bus.
+ * Intended to dynamically reconfigure the chip select parameters
+ * for configurable devices on the bus.
+ */
+int mpc512x_cs_config(unsigned int cs, u32 val)
+{
+ static struct mpc512x_lpc __iomem *lpc;
+ struct device_node *np;
+
+ if (cs > 7)
+ return -EINVAL;
+
+ if (!lpc) {
+ np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-lpc");
+ lpc = of_iomap(np, 0);
+ of_node_put(np);
+ if (!lpc)
+ return -ENOMEM;
+ }
+
+ out_be32(&lpc->cs_cfg[cs], val);
+ return 0;
+}
+EXPORT_SYMBOL(mpc512x_cs_config);
diff --git a/arch/powerpc/platforms/512x/pdm360ng.c b/arch/powerpc/platforms/512x/pdm360ng.c
new file mode 100644
index 0000000000..ce51cfeeb0
--- /dev/null
+++ b/arch/powerpc/platforms/512x/pdm360ng.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2010 DENX Software Engineering
+ *
+ * Anatolij Gustschin, <agust@denx.de>
+ *
+ * PDM360NG board setup
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_fdt.h>
+
+#include <asm/machdep.h>
+#include <asm/ipic.h>
+
+#include "mpc512x.h"
+
+#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
+ defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
+#include <linux/interrupt.h>
+#include <linux/spi/ads7846.h>
+#include <linux/spi/spi.h>
+#include <linux/notifier.h>
+
+static void *pdm360ng_gpio_base;
+
+static int pdm360ng_get_pendown_state(void)
+{
+ u32 reg;
+
+ reg = in_be32(pdm360ng_gpio_base + 0xc);
+ if (reg & 0x40)
+ setbits32(pdm360ng_gpio_base + 0xc, 0x40);
+
+ reg = in_be32(pdm360ng_gpio_base + 0x8);
+
+ /* return 1 if pen is down */
+ return (reg & 0x40) == 0;
+}
+
+static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
+ .model = 7845,
+ .get_pendown_state = pdm360ng_get_pendown_state,
+ .irq_flags = IRQF_TRIGGER_LOW,
+};
+
+static int __init pdm360ng_penirq_init(void)
+{
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-gpio");
+ if (!np) {
+ pr_err("%s: Can't find 'mpc5121-gpio' node\n", __func__);
+ return -ENODEV;
+ }
+
+ pdm360ng_gpio_base = of_iomap(np, 0);
+ of_node_put(np);
+ if (!pdm360ng_gpio_base) {
+ pr_err("%s: Can't map gpio regs.\n", __func__);
+ return -ENODEV;
+ }
+ out_be32(pdm360ng_gpio_base + 0xc, 0xffffffff);
+ setbits32(pdm360ng_gpio_base + 0x18, 0x2000);
+ setbits32(pdm360ng_gpio_base + 0x10, 0x40);
+
+ return 0;
+}
+
+static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
+ unsigned long event, void *__dev)
+{
+ struct device *dev = __dev;
+
+ if ((event == BUS_NOTIFY_ADD_DEVICE) &&
+ of_device_is_compatible(dev->of_node, "ti,ads7846")) {
+ dev->platform_data = &pdm360ng_ads7846_pdata;
+ return NOTIFY_OK;
+ }
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block pdm360ng_touchscreen_nb = {
+ .notifier_call = pdm360ng_touchscreen_notifier_call,
+};
+
+static void __init pdm360ng_touchscreen_init(void)
+{
+ if (pdm360ng_penirq_init())
+ return;
+
+ bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
+}
+#else
+static inline void __init pdm360ng_touchscreen_init(void)
+{
+}
+#endif /* CONFIG_TOUCHSCREEN_ADS7846 */
+
+void __init pdm360ng_init(void)
+{
+ mpc512x_init();
+ pdm360ng_touchscreen_init();
+}
+
+static int __init pdm360ng_probe(void)
+{
+ mpc512x_init_early();
+
+ return 1;
+}
+
+define_machine(pdm360ng) {
+ .name = "PDM360NG",
+ .compatible = "ifm,pdm360ng",
+ .probe = pdm360ng_probe,
+ .setup_arch = mpc512x_setup_arch,
+ .init = pdm360ng_init,
+ .init_IRQ = mpc512x_init_IRQ,
+ .get_irq = ipic_get_irq,
+ .restart = mpc512x_restart,
+};