PPC: E500: Add FSL I2C controller and integrate RTC with it

Original commit message:
This patch adds an emulation model for i2c controller found on most of the FSL SoCs.
It also integrates the RTC (ds1338) that sits on the i2c Bus with e500 machine model.

Patch was originally written by Amit Singh Tomar <amit.tomar@freescale.com>
see http://patchwork.ozlabs.org/patch/431475/
I only fixed it enough for application on top of current qemu master
20b084c4b1401b7f8fbc385649d48c67b6f43d44, and hopefully fixed checkpatch errors

Tested by booting Linux kernel 4.20.12. Now e500 machine doesn't need
network time protocol daemon because it will have working RTC
(before all timestamps on files were from 2016)

Signed-off-by: Amit Singh Tomar <amit.tomar@freescale.com>
Signed-off-by: Andrew Randrianasulu <randrianasulu@gmail.com>
Message-Id: <20190306102812.28972-1-randrianasulu@gmail.com>
[dwg: Add Kconfig stanza to define the new symbol, update MAINTAINERS]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 54 insertions, 0 deletions

diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c
index 7553f674c9..beb2efd694 100644
--- a/hw/ppc/e500.c
+++ b/hw/ppc/e500.c
@@ -42,6 +42,7 @@
 #include "qemu/error-report.h"
 #include "hw/platform-bus.h"
 #include "hw/net/fsl_etsec/etsec.h"
+#include "hw/i2c/i2c.h"
 
 #define EPAPR_MAGIC                (0x45504150)
 #define BINARY_DEVICE_TREE_FILE    "mpc8544ds.dtb"
@@ -63,7 +64,10 @@
 #define MPC8544_PCI_REGS_SIZE      0x1000ULL
 #define MPC8544_UTIL_OFFSET        0xe0000ULL
 #define MPC8XXX_GPIO_OFFSET        0x000FF000ULL
+#define MPC8544_I2C_REGS_OFFSET    0x3000ULL
 #define MPC8XXX_GPIO_IRQ           47
+#define MPC8544_I2C_IRQ            43
+#define RTC_REGS_OFFSET            0x68
 
 struct boot_info
 {
@@ -161,6 +165,39 @@ static void create_dt_mpc8xxx_gpio(void *fdt, const char *soc, const char *mpic)
     g_free(poweroff);
 }
 
+static void dt_rtc_create(void *fdt, const char *i2c, const char *alias)
+{
+    int offset = RTC_REGS_OFFSET;
+
+    gchar *rtc = g_strdup_printf("%s/rtc@%"PRIx32, i2c, offset);
+    qemu_fdt_add_subnode(fdt, rtc);
+    qemu_fdt_setprop_string(fdt, rtc, "compatible", "pericom,pt7c4338");
+    qemu_fdt_setprop_cells(fdt, rtc, "reg", offset);
+    qemu_fdt_setprop_string(fdt, "/aliases", alias, rtc);
+
+    g_free(rtc);
+}
+
+static void dt_i2c_create(void *fdt, const char *soc, const char *mpic,
+                             const char *alias)
+{
+    hwaddr mmio0 = MPC8544_I2C_REGS_OFFSET;
+    int irq0 = MPC8544_I2C_IRQ;
+
+    gchar *i2c = g_strdup_printf("%s/i2c@%"PRIx64, soc, mmio0);
+    qemu_fdt_add_subnode(fdt, i2c);
+    qemu_fdt_setprop_string(fdt, i2c, "device_type", "i2c");
+    qemu_fdt_setprop_string(fdt, i2c, "compatible", "fsl-i2c");
+    qemu_fdt_setprop_cells(fdt, i2c, "reg", mmio0, 0x14);
+    qemu_fdt_setprop_cells(fdt, i2c, "cell-index", 0);
+    qemu_fdt_setprop_cells(fdt, i2c, "interrupts", irq0, 0x2);
+    qemu_fdt_setprop_phandle(fdt, i2c, "interrupt-parent", mpic);
+    qemu_fdt_setprop_string(fdt, "/aliases", alias, i2c);
+
+    g_free(i2c);
+}
+
+
 typedef struct PlatformDevtreeData {
     void *fdt;
     const char *mpic;
@@ -464,6 +501,12 @@ static int ppce500_load_device_tree(PPCE500MachineState *pms,
                          soc, mpic, "serial0", 0, true);
     }
 
+    /* i2c */
+    dt_i2c_create(fdt, soc, mpic, "i2c");
+
+    dt_rtc_create(fdt, "i2c", "rtc");
+
+
     gutil = g_strdup_printf("%s/global-utilities@%llx", soc,
                             MPC8544_UTIL_OFFSET);
     qemu_fdt_add_subnode(fdt, gutil);
@@ -812,6 +855,7 @@ void ppce500_init(MachineState *machine)
     MemoryRegion *ccsr_addr_space;
     SysBusDevice *s;
     PPCE500CCSRState *ccsr;
+    I2CBus *i2c;
 
     irqs = g_new0(IrqLines, smp_cpus);
     for (i = 0; i < smp_cpus; i++) {
@@ -887,6 +931,16 @@ void ppce500_init(MachineState *machine)
                        0, qdev_get_gpio_in(mpicdev, 42), 399193,
                        serial_hd(1), DEVICE_BIG_ENDIAN);
     }
+        /* I2C */
+    dev = qdev_create(NULL, "mpc-i2c");
+    s = SYS_BUS_DEVICE(dev);
+    qdev_init_nofail(dev);
+    sysbus_connect_irq(s, 0, qdev_get_gpio_in(mpicdev, MPC8544_I2C_IRQ));
+    memory_region_add_subregion(ccsr_addr_space, MPC8544_I2C_REGS_OFFSET,
+                                sysbus_mmio_get_region(s, 0));
+    i2c = (I2CBus *)qdev_get_child_bus(dev, "i2c");
+    i2c_create_slave(i2c, "ds1338", RTC_REGS_OFFSET);
+
 
     /* General Utility device */
     dev = qdev_create(NULL, "mpc8544-guts");