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-rw-r--r--hw/pxa2xx.c247
1 files changed, 245 insertions, 2 deletions
diff --git a/hw/pxa2xx.c b/hw/pxa2xx.c
index a791f0845c..913c0bd764 100644
--- a/hw/pxa2xx.c
+++ b/hw/pxa2xx.c
@@ -69,9 +69,16 @@ static struct {
#define PCMD0 0x80 /* Power Manager I2C Command register File 0 */
#define PCMD31 0xfc /* Power Manager I2C Command register File 31 */
+static uint32_t pxa2xx_i2c_read(void *, target_phys_addr_t);
+static void pxa2xx_i2c_write(void *, target_phys_addr_t, uint32_t);
+
static uint32_t pxa2xx_pm_read(void *opaque, target_phys_addr_t addr)
{
struct pxa2xx_state_s *s = (struct pxa2xx_state_s *) opaque;
+ if (addr > s->pm_base + PCMD31) {
+ /* Special case: PWRI2C registers appear in the same range. */
+ return pxa2xx_i2c_read(s->i2c[1], addr);
+ }
addr -= s->pm_base;
switch (addr) {
@@ -92,6 +99,11 @@ static void pxa2xx_pm_write(void *opaque, target_phys_addr_t addr,
uint32_t value)
{
struct pxa2xx_state_s *s = (struct pxa2xx_state_s *) opaque;
+ if (addr > s->pm_base + PCMD31) {
+ /* Special case: PWRI2C registers appear in the same range. */
+ pxa2xx_i2c_write(s->i2c[1], addr, value);
+ return;
+ }
addr -= s->pm_base;
switch (addr) {
@@ -1086,6 +1098,225 @@ static CPUWriteMemoryFunc *pxa2xx_rtc_writefn[] = {
pxa2xx_rtc_write,
};
+/* I2C Interface */
+struct pxa2xx_i2c_s {
+ i2c_slave slave;
+ i2c_bus *bus;
+ target_phys_addr_t base;
+ qemu_irq irq;
+
+ uint16_t control;
+ uint16_t status;
+ uint8_t ibmr;
+ uint8_t data;
+};
+
+#define IBMR 0x80 /* I2C Bus Monitor register */
+#define IDBR 0x88 /* I2C Data Buffer register */
+#define ICR 0x90 /* I2C Control register */
+#define ISR 0x98 /* I2C Status register */
+#define ISAR 0xa0 /* I2C Slave Address register */
+
+static void pxa2xx_i2c_update(struct pxa2xx_i2c_s *s)
+{
+ uint16_t level = 0;
+ level |= s->status & s->control & (1 << 10); /* BED */
+ level |= (s->status & (1 << 7)) && (s->control & (1 << 9)); /* IRF */
+ level |= (s->status & (1 << 6)) && (s->control & (1 << 8)); /* ITE */
+ level |= s->status & (1 << 9); /* SAD */
+ qemu_set_irq(s->irq, !!level);
+}
+
+/* These are only stubs now. */
+static void pxa2xx_i2c_event(i2c_slave *i2c, enum i2c_event event)
+{
+ struct pxa2xx_i2c_s *s = (struct pxa2xx_i2c_s *) i2c;
+
+ switch (event) {
+ case I2C_START_SEND:
+ s->status |= (1 << 9); /* set SAD */
+ s->status &= ~(1 << 0); /* clear RWM */
+ break;
+ case I2C_START_RECV:
+ s->status |= (1 << 9); /* set SAD */
+ s->status |= 1 << 0; /* set RWM */
+ break;
+ case I2C_FINISH:
+ s->status |= (1 << 4); /* set SSD */
+ break;
+ case I2C_NACK:
+ s->status |= 1 << 1; /* set ACKNAK */
+ break;
+ }
+ pxa2xx_i2c_update(s);
+}
+
+static int pxa2xx_i2c_rx(i2c_slave *i2c)
+{
+ struct pxa2xx_i2c_s *s = (struct pxa2xx_i2c_s *) i2c;
+ if ((s->control & (1 << 14)) || !(s->control & (1 << 6)))
+ return 0;
+
+ if (s->status & (1 << 0)) { /* RWM */
+ s->status |= 1 << 6; /* set ITE */
+ }
+ pxa2xx_i2c_update(s);
+
+ return s->data;
+}
+
+static int pxa2xx_i2c_tx(i2c_slave *i2c, uint8_t data)
+{
+ struct pxa2xx_i2c_s *s = (struct pxa2xx_i2c_s *) i2c;
+ if ((s->control & (1 << 14)) || !(s->control & (1 << 6)))
+ return 1;
+
+ if (!(s->status & (1 << 0))) { /* RWM */
+ s->status |= 1 << 7; /* set IRF */
+ s->data = data;
+ }
+ pxa2xx_i2c_update(s);
+
+ return 1;
+}
+
+static uint32_t pxa2xx_i2c_read(void *opaque, target_phys_addr_t addr)
+{
+ struct pxa2xx_i2c_s *s = (struct pxa2xx_i2c_s *) opaque;
+ addr -= s->base;
+
+ switch (addr) {
+ case ICR:
+ return s->control;
+ case ISR:
+ return s->status | (i2c_bus_busy(s->bus) << 2);
+ case ISAR:
+ return s->slave.address;
+ case IDBR:
+ return s->data;
+ case IBMR:
+ if (s->status & (1 << 2))
+ s->ibmr ^= 3; /* Fake SCL and SDA pin changes */
+ else
+ s->ibmr = 0;
+ return s->ibmr;
+ default:
+ printf("%s: Bad register " REG_FMT "\n", __FUNCTION__, addr);
+ break;
+ }
+ return 0;
+}
+
+static void pxa2xx_i2c_write(void *opaque, target_phys_addr_t addr,
+ uint32_t value)
+{
+ struct pxa2xx_i2c_s *s = (struct pxa2xx_i2c_s *) opaque;
+ int ack;
+ addr -= s->base;
+
+ switch (addr) {
+ case ICR:
+ s->control = value & 0xfff7;
+ if ((value & (1 << 3)) && (value & (1 << 6))) { /* TB and IUE */
+ /* TODO: slave mode */
+ if (value & (1 << 0)) { /* START condition */
+ if (s->data & 1)
+ s->status |= 1 << 0; /* set RWM */
+ else
+ s->status &= ~(1 << 0); /* clear RWM */
+ ack = !i2c_start_transfer(s->bus, s->data >> 1, s->data & 1);
+ } else {
+ if (s->status & (1 << 0)) { /* RWM */
+ s->data = i2c_recv(s->bus);
+ if (value & (1 << 2)) /* ACKNAK */
+ i2c_nack(s->bus);
+ ack = 1;
+ } else
+ ack = !i2c_send(s->bus, s->data);
+ }
+
+ if (value & (1 << 1)) /* STOP condition */
+ i2c_end_transfer(s->bus);
+
+ if (ack) {
+ if (value & (1 << 0)) /* START condition */
+ s->status |= 1 << 6; /* set ITE */
+ else
+ if (s->status & (1 << 0)) /* RWM */
+ s->status |= 1 << 7; /* set IRF */
+ else
+ s->status |= 1 << 6; /* set ITE */
+ s->status &= ~(1 << 1); /* clear ACKNAK */
+ } else {
+ s->status |= 1 << 6; /* set ITE */
+ s->status |= 1 << 10; /* set BED */
+ s->status |= 1 << 1; /* set ACKNAK */
+ }
+ }
+ if (!(value & (1 << 3)) && (value & (1 << 6))) /* !TB and IUE */
+ if (value & (1 << 4)) /* MA */
+ i2c_end_transfer(s->bus);
+ pxa2xx_i2c_update(s);
+ break;
+
+ case ISR:
+ s->status &= ~(value & 0x07f0);
+ pxa2xx_i2c_update(s);
+ break;
+
+ case ISAR:
+ i2c_set_slave_address(&s->slave, value & 0x7f);
+ break;
+
+ case IDBR:
+ s->data = value & 0xff;
+ break;
+
+ default:
+ printf("%s: Bad register " REG_FMT "\n", __FUNCTION__, addr);
+ }
+}
+
+static CPUReadMemoryFunc *pxa2xx_i2c_readfn[] = {
+ pxa2xx_i2c_read,
+ pxa2xx_i2c_read,
+ pxa2xx_i2c_read,
+};
+
+static CPUWriteMemoryFunc *pxa2xx_i2c_writefn[] = {
+ pxa2xx_i2c_write,
+ pxa2xx_i2c_write,
+ pxa2xx_i2c_write,
+};
+
+struct pxa2xx_i2c_s *pxa2xx_i2c_init(target_phys_addr_t base,
+ qemu_irq irq, int ioregister)
+{
+ int iomemtype;
+ struct pxa2xx_i2c_s *s = (struct pxa2xx_i2c_s *)
+ qemu_mallocz(sizeof(struct pxa2xx_i2c_s));
+
+ s->base = base;
+ s->irq = irq;
+ s->slave.event = pxa2xx_i2c_event;
+ s->slave.recv = pxa2xx_i2c_rx;
+ s->slave.send = pxa2xx_i2c_tx;
+ s->bus = i2c_init_bus();
+
+ if (ioregister) {
+ iomemtype = cpu_register_io_memory(0, pxa2xx_i2c_readfn,
+ pxa2xx_i2c_writefn, s);
+ cpu_register_physical_memory(s->base & 0xfffff000, 0xfff, iomemtype);
+ }
+
+ return s;
+}
+
+i2c_bus *pxa2xx_i2c_bus(struct pxa2xx_i2c_s *s)
+{
+ return s->bus;
+}
+
/* PXA Inter-IC Sound Controller */
static void pxa2xx_i2s_reset(struct pxa2xx_i2s_s *i2s)
{
@@ -1544,7 +1775,7 @@ struct pxa2xx_state_s *pxa270_init(unsigned int sdram_size,
s->dma = pxa27x_dma_init(0x40000000, s->pic[PXA2XX_PIC_DMA]);
pxa27x_timer_init(0x40a00000, &s->pic[PXA2XX_PIC_OST_0],
- s->pic[PXA27X_PIC_OST_4_11], s->env);
+ s->pic[PXA27X_PIC_OST_4_11]);
s->gpio = pxa2xx_gpio_init(0x40e00000, s->env, s->pic, 121);
@@ -1608,6 +1839,12 @@ struct pxa2xx_state_s *pxa270_init(unsigned int sdram_size,
cpu_register_physical_memory(s->rtc_base, 0xfff, iomemtype);
pxa2xx_rtc_reset(s);
+ /* Note that PM registers are in the same page with PWRI2C registers.
+ * As a workaround we don't map PWRI2C into memory and we expect
+ * PM handlers to call PWRI2C handlers when appropriate. */
+ s->i2c[0] = pxa2xx_i2c_init(0x40301600, s->pic[PXA2XX_PIC_I2C], 1);
+ s->i2c[1] = pxa2xx_i2c_init(0x40f00100, s->pic[PXA2XX_PIC_PWRI2C], 0);
+
s->pm_base = 0x40f00000;
iomemtype = cpu_register_io_memory(0, pxa2xx_pm_readfn,
pxa2xx_pm_writefn, s);
@@ -1643,7 +1880,7 @@ struct pxa2xx_state_s *pxa255_init(unsigned int sdram_size,
s->dma = pxa255_dma_init(0x40000000, s->pic[PXA2XX_PIC_DMA]);
- pxa25x_timer_init(0x40a00000, &s->pic[PXA2XX_PIC_OST_0], s->env);
+ pxa25x_timer_init(0x40a00000, &s->pic[PXA2XX_PIC_OST_0]);
s->gpio = pxa2xx_gpio_init(0x40e00000, s->env, s->pic, 85);
@@ -1707,6 +1944,12 @@ struct pxa2xx_state_s *pxa255_init(unsigned int sdram_size,
cpu_register_physical_memory(s->rtc_base, 0xfff, iomemtype);
pxa2xx_rtc_reset(s);
+ /* Note that PM registers are in the same page with PWRI2C registers.
+ * As a workaround we don't map PWRI2C into memory and we expect
+ * PM handlers to call PWRI2C handlers when appropriate. */
+ s->i2c[0] = pxa2xx_i2c_init(0x40301600, s->pic[PXA2XX_PIC_I2C], 1);
+ s->i2c[1] = pxa2xx_i2c_init(0x40f00100, s->pic[PXA2XX_PIC_PWRI2C], 0);
+
s->pm_base = 0x40f00000;
iomemtype = cpu_register_io_memory(0, pxa2xx_pm_readfn,
pxa2xx_pm_writefn, s);
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-24 02:01:09 +0000