POWERPC: Get rid of remapping the whole immr

The stuff below cleans up the code attempting to remap the whole cpm2_immr
early, as well as places happily assuming that fact. This is more like the 2.4
legacy stuff, and is at least confusing and unclear now.

To keep the world comfortable, a new mechanism is introduced: before accessing
specific immr register/register set, one needs to map it, using cpm2_map(<reg>),
for instance, access to CPM command register will look like
	volatile cpm_cpm2_t *cp = cpm2_map(im_cpm);
keeping the code clear, yet without "already defined somewhere" cpm2_immr.

So far, unmapping code is not implemented, but it's not a big deal to add it,
if the whole idea makes sense.

Signed-off-by: Vitaly Bordug <vbordug@ru.mvista.com>

2 files changed, 88 insertions, 44 deletions

diff --git a/drivers/serial/cpm_uart/cpm_uart_cpm2.c b/drivers/serial/cpm_uart/cpm_uart_cpm2.c
index 02b9ef9..b691d3e 100644
--- a/drivers/serial/cpm_uart/cpm_uart_cpm2.c
+++ b/drivers/serial/cpm_uart/cpm_uart_cpm2.c
@@ -51,8 +51,9 @@
 
 void cpm_line_cr_cmd(int line, int cmd)
 {
-	volatile cpm_cpm2_t *cp = cpmp;
 	ulong val;
+	volatile cpm_cpm2_t *cp = cpm2_map(im_cpm);
+
 
 	switch (line) {
 	case UART_SMC1:
@@ -85,11 +86,14 @@ void cpm_line_cr_cmd(int line, int cmd)
 	}
 	cp->cp_cpcr = val;
 	while (cp->cp_cpcr & CPM_CR_FLG) ;
+
+	cpm2_unmap(cp);
 }
 
 void smc1_lineif(struct uart_cpm_port *pinfo)
 {
-	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
+	volatile iop_cpm2_t *io = cpm2_map(im_ioport);
+	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 
 	/* SMC1 is only on port D */
 	io->iop_ppard |= 0x00c00000;
@@ -98,13 +102,17 @@ void smc1_lineif(struct uart_cpm_port *pinfo)
 	io->iop_psord &= ~0x00c00000;
 
 	/* Wire BRG1 to SMC1 */
-	cpm2_immr->im_cpmux.cmx_smr &= 0x0f;
+	cpmux->cmx_smr &= 0x0f;
 	pinfo->brg = 1;
+
+	cpm2_unmap(cpmux);
+	cpm2_unmap(io);
 }
 
 void smc2_lineif(struct uart_cpm_port *pinfo)
 {
-	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
+	volatile iop_cpm2_t *io = cpm2_map(im_ioport);
+	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 
 	/* SMC2 is only on port A */
 	io->iop_ppara |= 0x00c00000;
@@ -113,13 +121,17 @@ void smc2_lineif(struct uart_cpm_port *pinfo)
 	io->iop_psora &= ~0x00c00000;
 
 	/* Wire BRG2 to SMC2 */
-	cpm2_immr->im_cpmux.cmx_smr &= 0xf0;
+	cpmux->cmx_smr &= 0xf0;
 	pinfo->brg = 2;
+
+	cpm2_unmap(cpmux);
+	cpm2_unmap(io);
 }
 
 void scc1_lineif(struct uart_cpm_port *pinfo)
 {
-	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
+	volatile iop_cpm2_t *io = cpm2_map(im_ioport);
+	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 
 	/* Use Port D for SCC1 instead of other functions.  */
 	io->iop_ppard |= 0x00000003;
@@ -129,9 +141,12 @@ void scc1_lineif(struct uart_cpm_port *pinfo)
 	io->iop_pdird |= 0x00000002;	/* Tx */
 
 	/* Wire BRG1 to SCC1 */
-	cpm2_immr->im_cpmux.cmx_scr &= 0x00ffffff;
-	cpm2_immr->im_cpmux.cmx_scr |= 0x00000000;
+	cpmux->cmx_scr &= 0x00ffffff;
+	cpmux->cmx_scr |= 0x00000000;
 	pinfo->brg = 1;
+
+	cpm2_unmap(cpmux);
+	cpm2_unmap(io);
 }
 
 void scc2_lineif(struct uart_cpm_port *pinfo)
@@ -144,43 +159,57 @@ void scc2_lineif(struct uart_cpm_port *pinfo)
 	 * be supported in a sane fashion.
 	 */
 #ifndef CONFIG_STX_GP3
-	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
+	volatile iop_cpm2_t *io = cpm2_map(im_ioport);
+	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
+
 	io->iop_pparb |= 0x008b0000;
 	io->iop_pdirb |= 0x00880000;
 	io->iop_psorb |= 0x00880000;
 	io->iop_pdirb &= ~0x00030000;
 	io->iop_psorb &= ~0x00030000;
 #endif
-	cpm2_immr->im_cpmux.cmx_scr &= 0xff00ffff;
-	cpm2_immr->im_cpmux.cmx_scr |= 0x00090000;
+	cpmux->cmx_scr &= 0xff00ffff;
+	cpmux->cmx_scr |= 0x00090000;
 	pinfo->brg = 2;
+
+	cpm2_unmap(cpmux);
+	cpm2_unmap(io);
 }
 
 void scc3_lineif(struct uart_cpm_port *pinfo)
 {
-	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
+	volatile iop_cpm2_t *io = cpm2_map(im_ioport);
+	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
+
 	io->iop_pparb |= 0x008b0000;
 	io->iop_pdirb |= 0x00880000;
 	io->iop_psorb |= 0x00880000;
 	io->iop_pdirb &= ~0x00030000;
 	io->iop_psorb &= ~0x00030000;
-	cpm2_immr->im_cpmux.cmx_scr &= 0xffff00ff;
-	cpm2_immr->im_cpmux.cmx_scr |= 0x00001200;
+	cpmux->cmx_scr &= 0xffff00ff;
+	cpmux->cmx_scr |= 0x00001200;
 	pinfo->brg = 3;
+
+	cpm2_unmap(cpmux);
+	cpm2_unmap(io);
 }
 
 void scc4_lineif(struct uart_cpm_port *pinfo)
 {
-	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
+	volatile iop_cpm2_t *io = cpm2_map(im_ioport);
+	volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
 
 	io->iop_ppard |= 0x00000600;
 	io->iop_psord &= ~0x00000600;	/* Tx/Rx */
 	io->iop_pdird &= ~0x00000200;	/* Rx */
 	io->iop_pdird |= 0x00000400;	/* Tx */
 
-	cpm2_immr->im_cpmux.cmx_scr &= 0xffffff00;
-	cpm2_immr->im_cpmux.cmx_scr |= 0x0000001b;
+	cpmux->cmx_scr &= 0xffffff00;
+	cpmux->cmx_scr |= 0x0000001b;
 	pinfo->brg = 4;
+
+	cpm2_unmap(cpmux);
+	cpm2_unmap(io);
 }
 
 /*
@@ -255,16 +284,23 @@ void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
 /* Setup any dynamic params in the uart desc */
 int cpm_uart_init_portdesc(void)
 {
+#if defined(CONFIG_SERIAL_CPM_SMC1) || defined(CONFIG_SERIAL_CPM_SMC2)
+	u32 addr;
+#endif
 	pr_debug("CPM uart[-]:init portdesc\n");
 
 	cpm_uart_nr = 0;
 #ifdef CONFIG_SERIAL_CPM_SMC1
-	cpm_uart_ports[UART_SMC1].smcp = (smc_t *) & cpm2_immr->im_smc[0];
-	cpm_uart_ports[UART_SMC1].smcup =
-	    (smc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SMC1];
-	*(u16 *)(&cpm2_immr->im_dprambase[PROFF_SMC1_BASE]) = PROFF_SMC1;
+	cpm_uart_ports[UART_SMC1].smcp = (smc_t *) cpm2_map(im_smc[0]);
 	cpm_uart_ports[UART_SMC1].port.mapbase =
-	    (unsigned long)&cpm2_immr->im_smc[0];
+	    (unsigned long)cpm_uart_ports[UART_SMC1].smcp;
+
+	cpm_uart_ports[UART_SMC1].smcup =
+	    (smc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SMC1], PROFF_SMC_SIZE);
+	addr = (u16 *)cpm2_map_size(im_dprambase[PROFF_SMC1_BASE], 2);
+	*addr = PROFF_SMC1;
+	cpm2_unmap(addr);
+
 	cpm_uart_ports[UART_SMC1].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
 	cpm_uart_ports[UART_SMC1].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 	cpm_uart_ports[UART_SMC1].port.uartclk = uart_clock();
@@ -272,12 +308,16 @@ int cpm_uart_init_portdesc(void)
 #endif
 
 #ifdef CONFIG_SERIAL_CPM_SMC2
-	cpm_uart_ports[UART_SMC2].smcp = (smc_t *) & cpm2_immr->im_smc[1];
-	cpm_uart_ports[UART_SMC2].smcup =
-	    (smc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SMC2];
-	*(u16 *)(&cpm2_immr->im_dprambase[PROFF_SMC2_BASE]) = PROFF_SMC2;
+	cpm_uart_ports[UART_SMC2].smcp = (smc_t *) cpm2_map(im_smc[1]);
 	cpm_uart_ports[UART_SMC2].port.mapbase =
-	    (unsigned long)&cpm2_immr->im_smc[1];
+	    (unsigned long)cpm_uart_ports[UART_SMC2].smcp;
+
+	cpm_uart_ports[UART_SMC2].smcup =
+	    (smc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SMC2], PROFF_SMC_SIZE);
+	addr = (u16 *)cpm2_map_size(im_dprambase[PROFF_SMC2_BASE], 2);
+	*addr = PROFF_SMC2;
+	cpm2_unmap(addr);
+
 	cpm_uart_ports[UART_SMC2].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
 	cpm_uart_ports[UART_SMC2].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 	cpm_uart_ports[UART_SMC2].port.uartclk = uart_clock();
@@ -285,11 +325,12 @@ int cpm_uart_init_portdesc(void)
 #endif
 
 #ifdef CONFIG_SERIAL_CPM_SCC1
-	cpm_uart_ports[UART_SCC1].sccp = (scc_t *) & cpm2_immr->im_scc[0];
-	cpm_uart_ports[UART_SCC1].sccup =
-	    (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC1];
+	cpm_uart_ports[UART_SCC1].sccp = (scc_t *) cpm2_map(im_scc[0]);
 	cpm_uart_ports[UART_SCC1].port.mapbase =
-	    (unsigned long)&cpm2_immr->im_scc[0];
+	    (unsigned long)cpm_uart_ports[UART_SCC1].sccp;
+	cpm_uart_ports[UART_SCC1].sccup =
+	    (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC1], PROFF_SCC_SIZE);
+
 	cpm_uart_ports[UART_SCC1].sccp->scc_sccm &=
 	    ~(UART_SCCM_TX | UART_SCCM_RX);
 	cpm_uart_ports[UART_SCC1].sccp->scc_gsmrl &=
@@ -299,11 +340,12 @@ int cpm_uart_init_portdesc(void)
 #endif
 
 #ifdef CONFIG_SERIAL_CPM_SCC2
-	cpm_uart_ports[UART_SCC2].sccp = (scc_t *) & cpm2_immr->im_scc[1];
-	cpm_uart_ports[UART_SCC2].sccup =
-	    (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC2];
+	cpm_uart_ports[UART_SCC2].sccp = (scc_t *) cpm2_map(im_scc[1]);
 	cpm_uart_ports[UART_SCC2].port.mapbase =
-	    (unsigned long)&cpm2_immr->im_scc[1];
+	    (unsigned long)cpm_uart_ports[UART_SCC2].sccp;
+	cpm_uart_ports[UART_SCC2].sccup =
+	    (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC2], PROFF_SCC_SIZE);
+
 	cpm_uart_ports[UART_SCC2].sccp->scc_sccm &=
 	    ~(UART_SCCM_TX | UART_SCCM_RX);
 	cpm_uart_ports[UART_SCC2].sccp->scc_gsmrl &=
@@ -313,11 +355,12 @@ int cpm_uart_init_portdesc(void)
 #endif
 
 #ifdef CONFIG_SERIAL_CPM_SCC3
-	cpm_uart_ports[UART_SCC3].sccp = (scc_t *) & cpm2_immr->im_scc[2];
-	cpm_uart_ports[UART_SCC3].sccup =
-	    (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC3];
+	cpm_uart_ports[UART_SCC3].sccp = (scc_t *) cpm2_map(im_scc[2]);
 	cpm_uart_ports[UART_SCC3].port.mapbase =
-	    (unsigned long)&cpm2_immr->im_scc[2];
+	    (unsigned long)cpm_uart_ports[UART_SCC3].sccp;
+	cpm_uart_ports[UART_SCC3].sccup =
+	    (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC3], PROFF_SCC_SIZE);
+
 	cpm_uart_ports[UART_SCC3].sccp->scc_sccm &=
 	    ~(UART_SCCM_TX | UART_SCCM_RX);
 	cpm_uart_ports[UART_SCC3].sccp->scc_gsmrl &=
@@ -327,11 +370,12 @@ int cpm_uart_init_portdesc(void)
 #endif
 
 #ifdef CONFIG_SERIAL_CPM_SCC4
-	cpm_uart_ports[UART_SCC4].sccp = (scc_t *) & cpm2_immr->im_scc[3];
-	cpm_uart_ports[UART_SCC4].sccup =
-	    (scc_uart_t *) & cpm2_immr->im_dprambase[PROFF_SCC4];
+	cpm_uart_ports[UART_SCC4].sccp = (scc_t *) cpm2_map(im_scc[3]);
 	cpm_uart_ports[UART_SCC4].port.mapbase =
-	    (unsigned long)&cpm2_immr->im_scc[3];
+	    (unsigned long)cpm_uart_ports[UART_SCC4].sccp;
+	cpm_uart_ports[UART_SCC4].sccup =
+	    (scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC4], PROFF_SCC_SIZE);
+
 	cpm_uart_ports[UART_SCC4].sccp->scc_sccm &=
 	    ~(UART_SCCM_TX | UART_SCCM_RX);
 	cpm_uart_ports[UART_SCC4].sccp->scc_gsmrl &=
diff --git a/drivers/serial/cpm_uart/cpm_uart_cpm2.h b/drivers/serial/cpm_uart/cpm_uart_cpm2.h
index 4793fec..a663300 100644
--- a/drivers/serial/cpm_uart/cpm_uart_cpm2.h
+++ b/drivers/serial/cpm_uart/cpm_uart_cpm2.h
@@ -40,6 +40,6 @@ static inline void cpm_set_smc_fcr(volatile smc_uart_t * up)
 	up->smc_tfcr = CPMFCR_GBL | CPMFCR_EB;
 }
 
-#define DPRAM_BASE	((unsigned char *)&cpm2_immr->im_dprambase[0])
+#define DPRAM_BASE	((unsigned char *)cpm_dpram_addr(0))
 
 #endif