Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/m68k/atari/Makefile b/arch/m68k/atari/Makefile
index 0cac723..2e3607f 100644
--- a/arch/m68k/atari/Makefile
+++ b/arch/m68k/atari/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
#
# Makefile for Linux arch/m68k/atari source directory
#
@@ -6,3 +7,5 @@
atasound.o stram.o
obj-$(CONFIG_ATARI_KBD_CORE) += atakeyb.o
+
+obj-$(CONFIG_NVRAM:m=y) += nvram.o
diff --git a/arch/m68k/atari/ataints.c b/arch/m68k/atari/ataints.c
index 3d2b63b..56f02ea 100644
--- a/arch/m68k/atari/ataints.c
+++ b/arch/m68k/atari/ataints.c
@@ -142,7 +142,7 @@
.name = "MFP Timer D"
};
-static irqreturn_t mfptimer_handler(int irq, void *dev_id)
+static irqreturn_t mfp_timer_d_handler(int irq, void *dev_id)
{
struct mfptimerbase *base = dev_id;
int mach_irq;
@@ -344,7 +344,7 @@
st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 0xf0) | 0x6;
/* request timer D dispatch handler */
- if (request_irq(IRQ_MFP_TIMD, mfptimer_handler, IRQF_SHARED,
+ if (request_irq(IRQ_MFP_TIMD, mfp_timer_d_handler, IRQF_SHARED,
stmfp_base.name, &stmfp_base))
pr_err("Couldn't register %s interrupt\n", stmfp_base.name);
diff --git a/arch/m68k/atari/config.c b/arch/m68k/atari/config.c
index bd96702..73bf5ea 100644
--- a/arch/m68k/atari/config.c
+++ b/arch/m68k/atari/config.c
@@ -78,7 +78,6 @@
/* atari specific timer functions (in time.c) */
extern void atari_sched_init(irq_handler_t);
-extern u32 atari_gettimeoffset(void);
extern int atari_mste_hwclk (int, struct rtc_time *);
extern int atari_tt_hwclk (int, struct rtc_time *);
@@ -148,7 +147,7 @@
/* Parse the Atari-specific switches= option. */
static int __init atari_switches_setup(char *str)
{
- char switches[strlen(str) + 1];
+ char switches[COMMAND_LINE_SIZE];
char *p;
int ovsc_shift;
char *args = switches;
@@ -205,7 +204,6 @@
mach_init_IRQ = atari_init_IRQ;
mach_get_model = atari_get_model;
mach_get_hardware_list = atari_get_hardware_list;
- arch_gettimeoffset = atari_gettimeoffset;
mach_reset = atari_reset;
mach_max_dma_address = 0xffffff;
#if IS_ENABLED(CONFIG_INPUT_M68K_BEEP)
@@ -248,9 +246,9 @@
} else if (hwreg_present(tt_palette)) {
ATARIHW_SET(TT_SHIFTER);
pr_cont(" TT_SHIFTER");
- } else if (hwreg_present(&shifter.bas_hi)) {
- if (hwreg_present(&shifter.bas_lo) &&
- (shifter.bas_lo = 0x0aau, shifter.bas_lo == 0x0aau)) {
+ } else if (hwreg_present(&shifter_st.bas_hi)) {
+ if (hwreg_present(&shifter_st.bas_lo) &&
+ (shifter_st.bas_lo = 0x0aau, shifter_st.bas_lo == 0x0aau)) {
ATARIHW_SET(EXTD_SHIFTER);
pr_cont(" EXTD_SHIFTER");
} else {
diff --git a/arch/m68k/atari/nvram.c b/arch/m68k/atari/nvram.c
new file mode 100644
index 0000000..7000d24
--- /dev/null
+++ b/arch/m68k/atari/nvram.c
@@ -0,0 +1,272 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * CMOS/NV-RAM driver for Atari. Adapted from drivers/char/nvram.c.
+ * Copyright (C) 1997 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
+ * idea by and with help from Richard Jelinek <rj@suse.de>
+ * Portions copyright (c) 2001,2002 Sun Microsystems (thockin@sun.com)
+ * Further contributions from Cesar Barros, Erik Gilling, Tim Hockin and
+ * Wim Van Sebroeck.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/mc146818rtc.h>
+#include <linux/module.h>
+#include <linux/nvram.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <asm/atarihw.h>
+#include <asm/atariints.h>
+
+#define NVRAM_BYTES 50
+
+/* It is worth noting that these functions all access bytes of general
+ * purpose memory in the NVRAM - that is to say, they all add the
+ * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not
+ * know about the RTC cruft.
+ */
+
+/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
+ * rtc_lock held. Due to the index-port/data-port design of the RTC, we
+ * don't want two different things trying to get to it at once. (e.g. the
+ * periodic 11 min sync from kernel/time/ntp.c vs. this driver.)
+ */
+
+static unsigned char __nvram_read_byte(int i)
+{
+ return CMOS_READ(NVRAM_FIRST_BYTE + i);
+}
+
+/* This races nicely with trying to read with checksum checking */
+static void __nvram_write_byte(unsigned char c, int i)
+{
+ CMOS_WRITE(c, NVRAM_FIRST_BYTE + i);
+}
+
+/* On Ataris, the checksum is over all bytes except the checksum bytes
+ * themselves; these are at the very end.
+ */
+#define ATARI_CKS_RANGE_START 0
+#define ATARI_CKS_RANGE_END 47
+#define ATARI_CKS_LOC 48
+
+static int __nvram_check_checksum(void)
+{
+ int i;
+ unsigned char sum = 0;
+
+ for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
+ sum += __nvram_read_byte(i);
+ return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) &&
+ (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));
+}
+
+static void __nvram_set_checksum(void)
+{
+ int i;
+ unsigned char sum = 0;
+
+ for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
+ sum += __nvram_read_byte(i);
+ __nvram_write_byte(~sum, ATARI_CKS_LOC);
+ __nvram_write_byte(sum, ATARI_CKS_LOC + 1);
+}
+
+long atari_nvram_set_checksum(void)
+{
+ spin_lock_irq(&rtc_lock);
+ __nvram_set_checksum();
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+}
+
+long atari_nvram_initialize(void)
+{
+ loff_t i;
+
+ spin_lock_irq(&rtc_lock);
+ for (i = 0; i < NVRAM_BYTES; ++i)
+ __nvram_write_byte(0, i);
+ __nvram_set_checksum();
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+}
+
+ssize_t atari_nvram_read(char *buf, size_t count, loff_t *ppos)
+{
+ char *p = buf;
+ loff_t i;
+
+ spin_lock_irq(&rtc_lock);
+ if (!__nvram_check_checksum()) {
+ spin_unlock_irq(&rtc_lock);
+ return -EIO;
+ }
+ for (i = *ppos; count > 0 && i < NVRAM_BYTES; --count, ++i, ++p)
+ *p = __nvram_read_byte(i);
+ spin_unlock_irq(&rtc_lock);
+
+ *ppos = i;
+ return p - buf;
+}
+
+ssize_t atari_nvram_write(char *buf, size_t count, loff_t *ppos)
+{
+ char *p = buf;
+ loff_t i;
+
+ spin_lock_irq(&rtc_lock);
+ if (!__nvram_check_checksum()) {
+ spin_unlock_irq(&rtc_lock);
+ return -EIO;
+ }
+ for (i = *ppos; count > 0 && i < NVRAM_BYTES; --count, ++i, ++p)
+ __nvram_write_byte(*p, i);
+ __nvram_set_checksum();
+ spin_unlock_irq(&rtc_lock);
+
+ *ppos = i;
+ return p - buf;
+}
+
+ssize_t atari_nvram_get_size(void)
+{
+ return NVRAM_BYTES;
+}
+
+#ifdef CONFIG_PROC_FS
+static struct {
+ unsigned char val;
+ const char *name;
+} boot_prefs[] = {
+ { 0x80, "TOS" },
+ { 0x40, "ASV" },
+ { 0x20, "NetBSD (?)" },
+ { 0x10, "Linux" },
+ { 0x00, "unspecified" },
+};
+
+static const char * const languages[] = {
+ "English (US)",
+ "German",
+ "French",
+ "English (UK)",
+ "Spanish",
+ "Italian",
+ "6 (undefined)",
+ "Swiss (French)",
+ "Swiss (German)",
+};
+
+static const char * const dateformat[] = {
+ "MM%cDD%cYY",
+ "DD%cMM%cYY",
+ "YY%cMM%cDD",
+ "YY%cDD%cMM",
+ "4 (undefined)",
+ "5 (undefined)",
+ "6 (undefined)",
+ "7 (undefined)",
+};
+
+static const char * const colors[] = {
+ "2", "4", "16", "256", "65536", "??", "??", "??"
+};
+
+static void atari_nvram_proc_read(unsigned char *nvram, struct seq_file *seq,
+ void *offset)
+{
+ int checksum;
+ int i;
+ unsigned int vmode;
+
+ spin_lock_irq(&rtc_lock);
+ checksum = __nvram_check_checksum();
+ spin_unlock_irq(&rtc_lock);
+
+ seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not ");
+
+ seq_puts(seq, "Boot preference : ");
+ for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i)
+ if (nvram[1] == boot_prefs[i].val) {
+ seq_printf(seq, "%s\n", boot_prefs[i].name);
+ break;
+ }
+ if (i < 0)
+ seq_printf(seq, "0x%02x (undefined)\n", nvram[1]);
+
+ seq_printf(seq, "SCSI arbitration : %s\n",
+ (nvram[16] & 0x80) ? "on" : "off");
+ seq_puts(seq, "SCSI host ID : ");
+ if (nvram[16] & 0x80)
+ seq_printf(seq, "%d\n", nvram[16] & 7);
+ else
+ seq_puts(seq, "n/a\n");
+
+ if (!MACH_IS_FALCON)
+ return;
+
+ seq_puts(seq, "OS language : ");
+ if (nvram[6] < ARRAY_SIZE(languages))
+ seq_printf(seq, "%s\n", languages[nvram[6]]);
+ else
+ seq_printf(seq, "%u (undefined)\n", nvram[6]);
+ seq_puts(seq, "Keyboard language: ");
+ if (nvram[7] < ARRAY_SIZE(languages))
+ seq_printf(seq, "%s\n", languages[nvram[7]]);
+ else
+ seq_printf(seq, "%u (undefined)\n", nvram[7]);
+ seq_puts(seq, "Date format : ");
+ seq_printf(seq, dateformat[nvram[8] & 7],
+ nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
+ seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12);
+ seq_puts(seq, "Boot delay : ");
+ if (nvram[10] == 0)
+ seq_puts(seq, "default\n");
+ else
+ seq_printf(seq, "%ds%s\n", nvram[10],
+ nvram[10] < 8 ? ", no memory test" : "");
+
+ vmode = (nvram[14] << 8) | nvram[15];
+ seq_printf(seq,
+ "Video mode : %s colors, %d columns, %s %s monitor\n",
+ colors[vmode & 7], vmode & 8 ? 80 : 40,
+ vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
+ seq_printf(seq,
+ " %soverscan, compat. mode %s%s\n",
+ vmode & 64 ? "" : "no ", vmode & 128 ? "on" : "off",
+ vmode & 256 ?
+ (vmode & 16 ? ", line doubling" : ", half screen") : "");
+}
+
+static int nvram_proc_read(struct seq_file *seq, void *offset)
+{
+ unsigned char contents[NVRAM_BYTES];
+ int i;
+
+ spin_lock_irq(&rtc_lock);
+ for (i = 0; i < NVRAM_BYTES; ++i)
+ contents[i] = __nvram_read_byte(i);
+ spin_unlock_irq(&rtc_lock);
+
+ atari_nvram_proc_read(contents, seq, offset);
+
+ return 0;
+}
+
+static int __init atari_nvram_init(void)
+{
+ if (!(MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK)))
+ return -ENODEV;
+
+ if (!proc_create_single("driver/nvram", 0, NULL, nvram_proc_read)) {
+ pr_err("nvram: can't create /proc/driver/nvram\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+device_initcall(atari_nvram_init);
+#endif /* CONFIG_PROC_FS */
diff --git a/arch/m68k/atari/stram.c b/arch/m68k/atari/stram.c
index c83d664..6152f9f 100644
--- a/arch/m68k/atari/stram.c
+++ b/arch/m68k/atari/stram.c
@@ -17,7 +17,7 @@
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
-#include <linux/bootmem.h>
+#include <linux/memblock.h>
#include <linux/mount.h>
#include <linux/blkdev.h>
#include <linux/module.h>
@@ -95,7 +95,12 @@
{
if (kernel_in_stram) {
pr_debug("atari_stram pool: kernel in ST-RAM, using alloc_bootmem!\n");
- stram_pool.start = (resource_size_t)alloc_bootmem_low_pages(pool_size);
+ stram_pool.start = (resource_size_t)memblock_alloc_low(pool_size,
+ PAGE_SIZE);
+ if (!stram_pool.start)
+ panic("%s: Failed to allocate %lu bytes align=%lx\n",
+ __func__, pool_size, PAGE_SIZE);
+
stram_pool.end = stram_pool.start + pool_size - 1;
request_resource(&iomem_resource, &stram_pool);
stram_virt_offset = 0;
diff --git a/arch/m68k/atari/time.c b/arch/m68k/atari/time.c
index 9cca642..ce923a5 100644
--- a/arch/m68k/atari/time.c
+++ b/arch/m68k/atari/time.c
@@ -16,6 +16,7 @@
#include <linux/init.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
+#include <linux/clocksource.h>
#include <linux/delay.h>
#include <linux/export.h>
@@ -24,6 +25,35 @@
DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL_GPL(rtc_lock);
+static u64 atari_read_clk(struct clocksource *cs);
+
+static struct clocksource atari_clk = {
+ .name = "mfp",
+ .rating = 100,
+ .read = atari_read_clk,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static u32 clk_total;
+static u8 last_timer_count;
+
+static irqreturn_t mfp_timer_c_handler(int irq, void *dev_id)
+{
+ irq_handler_t timer_routine = dev_id;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ do {
+ last_timer_count = st_mfp.tim_dt_c;
+ } while (last_timer_count == 1);
+ clk_total += INT_TICKS;
+ timer_routine(0, NULL);
+ local_irq_restore(flags);
+
+ return IRQ_HANDLED;
+}
+
void __init
atari_sched_init(irq_handler_t timer_routine)
{
@@ -32,31 +62,33 @@
/* start timer C, div = 1:100 */
st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 15) | 0x60;
/* install interrupt service routine for MFP Timer C */
- if (request_irq(IRQ_MFP_TIMC, timer_routine, 0, "timer", timer_routine))
+ if (request_irq(IRQ_MFP_TIMC, mfp_timer_c_handler, IRQF_TIMER, "timer",
+ timer_routine))
pr_err("Couldn't register timer interrupt\n");
+
+ clocksource_register_hz(&atari_clk, INT_CLK);
}
/* ++andreas: gettimeoffset fixed to check for pending interrupt */
-#define TICK_SIZE 10000
-
-/* This is always executed with interrupts disabled. */
-u32 atari_gettimeoffset(void)
+static u64 atari_read_clk(struct clocksource *cs)
{
- u32 ticks, offset = 0;
+ unsigned long flags;
+ u8 count;
+ u32 ticks;
- /* read MFP timer C current value */
- ticks = st_mfp.tim_dt_c;
- /* The probability of underflow is less than 2% */
- if (ticks > INT_TICKS - INT_TICKS / 50)
- /* Check for pending timer interrupt */
- if (st_mfp.int_pn_b & (1 << 5))
- offset = TICK_SIZE;
+ local_irq_save(flags);
+ /* Ensure that the count is monotonically decreasing, even though
+ * the result may briefly stop changing after counter wrap-around.
+ */
+ count = min(st_mfp.tim_dt_c, last_timer_count);
+ last_timer_count = count;
- ticks = INT_TICKS - ticks;
- ticks = ticks * 10000L / INT_TICKS;
+ ticks = INT_TICKS - count;
+ ticks += clk_total;
+ local_irq_restore(flags);
- return (ticks + offset) * 1000;
+ return ticks;
}