[PPC32] Change how we handle DP memory on MPC8xx.

We now have a 'remote heap' implemented (see comments in
arch/ppc/lib/rheap.c) which manages this memory.
From Pantelis Antoniou <panto@intracom.gr>.
Signed-off-by: Tom Rini <trini@kernel.crashing.org>

arch/ppc/8xx_io/commproc.c

@@ -27,6 +27,7 @@
 #include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/interrupt.h>
+#include <linux/module.h>
 #include <asm/irq.h>
 #include <asm/mpc8xx.h>
 #include <asm/page.h>
@@ -34,11 +35,11 @@
 #include <asm/8xx_immap.h>
 #include <asm/commproc.h>
 #include <asm/io.h>
+#include <asm/rheap.h>
 
 extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep);
 
-static	uint	dp_alloc_base;	/* Starting offset in DP ram */
-static	uint	dp_alloc_top;	/* Max offset + 1 */
+static void m8xx_cpm_dpinit(void);
 static	uint	host_buffer;	/* One page of host buffer */
 static	uint	host_end;	/* end + 1 */
 cpm8xx_t	*cpmp;		/* Pointer to comm processor space */
@@ -84,10 +85,8 @@ m8xx_cpm_reset(void)
 	 */
 	imp->im_siu_conf.sc_sdcr = 1;
 
-	/* Reclaim the DP memory for our use.
-	*/
-	dp_alloc_base = CPM_DATAONLY_BASE;
-	dp_alloc_top = dp_alloc_base + CPM_DATAONLY_SIZE;
+	/* Reclaim the DP memory for our use. */
+	m8xx_cpm_dpinit();
 
 	/* Tell everyone where the comm processor resides.
 	*/
@@ -138,10 +137,8 @@ m8xx_cpm_reset(uint host_page_addr)
 	*/
 	imp->im_siu_conf.sc_sdcr = 1;
 
-	/* Reclaim the DP memory for our use.
-	*/
-	dp_alloc_base = CPM_DATAONLY_BASE;
-	dp_alloc_top = dp_alloc_base + CPM_DATAONLY_SIZE;
+	/* Reclaim the DP memory for our use. */
+	m8xx_cpm_dpinit();
 
 	/* Set the host page for allocation.
 	*/
@@ -257,30 +254,6 @@ cpm_free_handler(int vec)
 	((immap_t *)IMAP_ADDR)->im_cpic.cpic_cimr &= ~(1 << vec);
 }
 
-/* Allocate some memory from the dual ported ram.  We may want to
- * enforce alignment restrictions, but right now everyone is a good
- * citizen.
- */
-uint
-m8xx_cpm_dpalloc(uint size)
-{
-	uint	retloc;
-
-	if ((dp_alloc_base + size) >= dp_alloc_top)
-		return(CPM_DP_NOSPACE);
-
-	retloc = dp_alloc_base;
-	dp_alloc_base += size;
-
-	return(retloc);
-}
-
-uint
-m8xx_cpm_dpalloc_index(void)
-{
-	return dp_alloc_base;
-}
-
 /* We also own one page of host buffer space for the allocation of
  * UART "fifos" and the like.
  */
@@ -330,3 +303,102 @@ m8xx_cpm_setbrg(uint brg, uint rate)
 		*bp = (((BRG_UART_CLK_DIV16 / rate) - 1) << 1) |
 						CPM_BRG_EN | CPM_BRG_DIV16;
 }
+
+/*
+ * dpalloc / dpfree bits.
+ */
+static spinlock_t cpm_dpmem_lock;
+/*
+ * 16 blocks should be enough to satisfy all requests
+ * until the memory subsystem goes up...
+ */
+static rh_block_t cpm_boot_dpmem_rh_block[16];
+static rh_info_t cpm_dpmem_info;
+
+#define CPM_DPMEM_ALIGNMENT	8
+
+void m8xx_cpm_dpinit(void)
+{
+	cpm8xx_t *cp = &((immap_t *)IMAP_ADDR)->im_cpm;
+
+	spin_lock_init(&cpm_dpmem_lock);
+
+	/* Initialize the info header */
+	rh_init(&cpm_dpmem_info, CPM_DPMEM_ALIGNMENT,
+			sizeof(cpm_boot_dpmem_rh_block) /
+			sizeof(cpm_boot_dpmem_rh_block[0]),
+			cpm_boot_dpmem_rh_block);
+
+	/*
+	 * Attach the usable dpmem area.
+	 * XXX: This is actually crap.  CPM_DATAONLY_BASE and
+	 * CPM_DATAONLY_SIZE are a subset of the available dparm.  It varies
+	 * with the processor and the microcode patches applied / activated.
+	 * But the following should be at least safe.
+	 */
+	rh_attach_region(&cpm_dpmem_info, cp->cp_dpmem + CPM_DATAONLY_BASE,
+			CPM_DATAONLY_SIZE);
+}
+
+/*
+ * Allocate the requested size worth of DP memory.
+ * This function used to return an index into the DPRAM area.
+ * Now it returns the actuall physical address of that area.
+ * use m8xx_cpm_dpram_offset() to get the index
+ */
+void *m8xx_cpm_dpalloc(int size)
+{
+	void *start;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cpm_dpmem_lock, flags);
+	start = rh_alloc(&cpm_dpmem_info, size, "commproc");
+	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
+
+	return start;
+}
+EXPORT_SYMBOL(m8xx_cpm_dpalloc);
+
+int m8xx_cpm_dpfree(void *addr)
+{
+	int ret;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cpm_dpmem_lock, flags);
+	ret = rh_free(&cpm_dpmem_info, addr);
+	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
+
+	return ret;
+}
+EXPORT_SYMBOL(m8xx_cpm_dpfree);
+
+void *m8xx_cpm_dpalloc_fixed(void *addr, int size)
+{
+	void *start;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cpm_dpmem_lock, flags);
+	start = rh_alloc_fixed(&cpm_dpmem_info, addr, size, "commproc");
+	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
+
+	return start;
+}
+EXPORT_SYMBOL(m8xx_cpm_dpalloc_fixed);
+
+void m8xx_cpm_dpdump(void)
+{
+	rh_dump(&cpm_dpmem_info);
+}
+EXPORT_SYMBOL(m8xx_cpm_dpdump);
+
+int m8xx_cpm_dpram_offset(void *addr)
+{
+	return (u_char *)addr - ((immap_t *)IMAP_ADDR)->im_cpm.cp_dpmem;
+}
+EXPORT_SYMBOL(m8xx_cpm_dpram_offset);
+
+void *m8xx_cpm_dpram_addr(int offset)
+{
+	return ((immap_t *)IMAP_ADDR)->im_cpm.cp_dpmem + offset;
+}
+EXPORT_SYMBOL(m8xx_cpm_dpram_addr);

arch/ppc/8xx_io/cs4218_tdm.c

@@ -2463,7 +2463,7 @@ static long long sound_lseek(struct file *file, long long offset, int orig)
 int __init tdm8xx_sound_init(void)
 {
 	int i, has_sound;
-	uint			dp_addr;
+	uint			dp_addr, dp_mem;
 	volatile uint		*sirp;
 	volatile cbd_t		*bdp;
 	volatile cpm8xx_t	*cp;
@@ -2525,14 +2525,15 @@ int __init tdm8xx_sound_init(void)
 	/* We need to allocate a transmit and receive buffer
 	 * descriptors from dual port ram.
 	 */
-	dp_addr = m8xx_cpm_dpalloc(sizeof(cbd_t) * numReadBufs);
+	dp_mem = m8xx_cpm_dpalloc(sizeof(cbd_t) * numReadBufs);
+	dp_addr = m8xx_cpm_dpram_offset(dp_mem);
 
 	/* Set the physical address of the host memory
 	 * buffers in the buffer descriptors, and the
 	 * virtual address for us to work with.
 	 */
 	bdp = (cbd_t *)&cp->cp_dpmem[dp_addr];
-	up->smc_rbase = dp_addr;
+	up->smc_rbase = dp_mem;
 	rx_cur = rx_base = (cbd_t *)bdp;
 
 	for (i=0; i<(numReadBufs-1); i++) {
@@ -2547,10 +2548,11 @@ int __init tdm8xx_sound_init(void)
 
 	/* Now, do the same for the transmit buffers.
 	*/
-	dp_addr = m8xx_cpm_dpalloc(sizeof(cbd_t) * numBufs);
+	dp_mem = m8xx_cpm_dpalloc(sizeof(cbd_t) * numBufs);
+	dp_addr = m8xx_cpm_dpram_offset(dp_mem);
 
 	bdp = (cbd_t *)&cp->cp_dpmem[dp_addr];
-	up->smc_tbase = dp_addr;
+	up->smc_tbase = dp_mem;
 	tx_cur = tx_base = (cbd_t *)bdp;
 
 	for (i=0; i<(numBufs-1); i++) {

arch/ppc/8xx_io/enet.c

@@ -644,6 +644,8 @@ static int __init scc_enet_init(void)
 	struct net_device *dev;
 	struct scc_enet_private *cep;
 	int i, j, k, err;
+	void *dp_mem;
+	unsigned int dp_addr;
 	unsigned char	*eap, *ba;
 	dma_addr_t	mem_addr;
 	bd_t		*bd;
@@ -738,13 +740,15 @@ static int __init scc_enet_init(void)
 	 * These are relative offsets in the DP ram address space.
 	 * Initialize base addresses for the buffer descriptors.
 	 */
-	i = m8xx_cpm_dpalloc(sizeof(cbd_t) * RX_RING_SIZE);
-	ep->sen_genscc.scc_rbase = i;
-	cep->rx_bd_base = (cbd_t *)&cp->cp_dpmem[i];
+	dp_mem = m8xx_cpm_dpalloc(sizeof(cbd_t) * RX_RING_SIZE);
+	dp_addr = m8xx_cpm_dpram_offset(dp_mem);
+	ep->sen_genscc.scc_rbase = dp_mem;
+	cep->rx_bd_base = (cbd_t *)&cp->cp_dpmem[dp_addr];
 
-	i = m8xx_cpm_dpalloc(sizeof(cbd_t) * TX_RING_SIZE);
-	ep->sen_genscc.scc_tbase = i;
-	cep->tx_bd_base = (cbd_t *)&cp->cp_dpmem[i];
+	dp_mem = m8xx_cpm_dpalloc(sizeof(cbd_t) * TX_RING_SIZE);
+	dp_addr = m8xx_cpm_dpram_offset(dp_mem);
+	ep->sen_genscc.scc_tbase = dp_mem;
+	cep->tx_bd_base = (cbd_t *)&cp->cp_dpmem[dp_addr];
 
 	cep->dirty_tx = cep->cur_tx = cep->tx_bd_base;
 	cep->cur_rx = cep->rx_bd_base;

arch/ppc/8xx_io/uart.c

@@ -2491,7 +2491,7 @@ static int __init rs_8xx_init(void)
 {
 	struct serial_state * state;
 	ser_info_t	*info;
-	uint		mem_addr, dp_addr, iobits;
+	uint		mem_addr, dp_addr, dp_mem, iobits;
 	int		i, j, idx;
 	ushort		chan;
 	volatile	cbd_t		*bdp;
@@ -2623,7 +2623,8 @@ static int __init rs_8xx_init(void)
 			 * descriptors from dual port ram, and a character
 			 * buffer area from host mem.
 			 */
-			dp_addr = m8xx_cpm_dpalloc(sizeof(cbd_t) * RX_NUM_FIFO);
+			dp_mem = m8xx_cpm_dpalloc(sizeof(cbd_t) * RX_NUM_FIFO);
+			dp_addr = m8xx_cpm_dpram_offset(dp_mem);
 
 			/* Allocate space for FIFOs in the host memory.
 			*/
@@ -2650,15 +2651,16 @@ static int __init rs_8xx_init(void)
 			if (info->state->smc_scc_num & NUM_IS_SCC) {
 				scp = &cp->cp_scc[idx];
 				sup = (scc_uart_t *)&cp->cp_dparam[state->port];
-				sup->scc_genscc.scc_rbase = dp_addr;
+				sup->scc_genscc.scc_rbase = dp_mem;
 			}
 			else {
 				sp = &cp->cp_smc[idx];
 				up = (smc_uart_t *)&cp->cp_dparam[state->port];
-				up->smc_rbase = dp_addr;
+				up->smc_rbase = dp_mem;
 			}
 
-			dp_addr = m8xx_cpm_dpalloc(sizeof(cbd_t) * TX_NUM_FIFO);
+			dp_mem = m8xx_cpm_dpalloc(sizeof(cbd_t) * TX_NUM_FIFO);
+			dp_addr = m8xx_cpm_dpram_offset(dp_mem);
 
 			/* Allocate space for FIFOs in the host memory.
 			*/
@@ -2682,7 +2684,7 @@ static int __init rs_8xx_init(void)
 			bdp->cbd_sc = (BD_SC_WRAP | BD_SC_INTRPT);
 
 			if (info->state->smc_scc_num & NUM_IS_SCC) {
-				sup->scc_genscc.scc_tbase = dp_addr;
+				sup->scc_genscc.scc_tbase = dp_mem;
 
 				/* Set up the uart parameters in the
 				 * parameter ram.
@@ -2779,7 +2781,7 @@ static int __init rs_8xx_init(void)
 				cp->cp_simode &= ~(0xffff << (idx * 16));
 				cp->cp_simode |= (i << ((idx * 16) + 12));
 
-				up->smc_tbase = dp_addr;
+				up->smc_tbase = dp_mem;
 
 				/* Set up the uart parameters in the
 				 * parameter ram.
@@ -2843,7 +2845,7 @@ module_init(rs_8xx_init);
 static int __init serial_console_setup(struct console *co, char *options)
 {
 	struct		serial_state *ser;
-	uint		mem_addr, dp_addr, bidx, idx;
+	uint		mem_addr, dp_addr, dp_mem, bidx, idx;
 	ushort		chan;
 	volatile	cbd_t		*bdp;
 	volatile	cpm8xx_t	*cp;
@@ -2889,12 +2891,14 @@ static int __init serial_console_setup(struct console *co, char *options)
 	 * memory yet because vm allocator isn't initialized
 	 * during this early console init.
 	 */
-	dp_addr = m8xx_cpm_dpalloc(8);
+	dp_mem = m8xx_cpm_dpalloc(8);
+	dp_addr = m8xx_cpm_dpram_offset(dp_mem);
 	mem_addr = (uint)(&cpmp->cp_dpmem[dp_addr]);
 
 	/* Allocate space for two buffer descriptors in the DP ram.
 	*/
-	dp_addr = m8xx_cpm_dpalloc(sizeof(cbd_t) * 2);
+	dp_mem = m8xx_cpm_dpalloc(sizeof(cbd_t) * 2);
+	dp_addr = m8xx_cpm_dpram_offset(dp_mem);
 
 	/* Set the physical address of the host memory buffers in
 	 * the buffer descriptors.
@@ -2918,8 +2922,8 @@ static int __init serial_console_setup(struct console *co, char *options)
 	*/
 	if (ser->smc_scc_num & NUM_IS_SCC) {
 
-		sup->scc_genscc.scc_rbase = dp_addr;
-		sup->scc_genscc.scc_tbase = dp_addr + sizeof(cbd_t);
+		sup->scc_genscc.scc_rbase = dp_mem;
+		sup->scc_genscc.scc_tbase = dp_mem + sizeof(cbd_t);
 
 		/* Set up the uart parameters in the
 		 * parameter ram.
@@ -2977,8 +2981,8 @@ static int __init serial_console_setup(struct console *co, char *options)
 
 	}
 	else {
-		up->smc_rbase = dp_addr;	/* Base of receive buffer desc. */
-		up->smc_tbase = dp_addr+sizeof(cbd_t);	/* Base of xmt buffer desc. */
+		up->smc_rbase = dp_mem;	/* Base of receive buffer desc. */
+		up->smc_tbase = dp_mem+sizeof(cbd_t);	/* Base of xmt buffer desc. */
 		up->smc_rfcr = SMC_EB;
 		up->smc_tfcr = SMC_EB;
 

arch/ppc/lib/Makefile

@@ -5,3 +5,4 @@
 obj-y			:= checksum.o string.o strcase.o dec_and_lock.o div64.o
 
 obj-$(CONFIG_SMP)	+= locks.o
+obj-$(CONFIG_8xx)	+= rheap.o

drivers/i2c/busses/i2c-rpx.c

@@ -50,7 +50,8 @@ rpx_iic_init(struct i2c_algo_8xx_data *data)
 	/* Allocate space for two transmit and two receive buffer
 	 * descriptors in the DP ram.
 	 */
-	data->dp_addr = m8xx_cpm_dpalloc(sizeof(cbd_t) * 4);
+	data->dp_addr = m8xx_cpm_dpram_offset(m8xx_cpm_dpalloc(sizeof(cbd_t)
+				* 4));
 
 	/* ptr to i2c area */
 	data->i2c = (i2c8xx_t *)&(((immap_t *)IMAP_ADDR)->im_i2c);

drivers/serial/cpm_uart/cpm_uart_cpm1.c

@@ -129,6 +129,7 @@ void scc4_lineif(struct uart_cpm_port *pinfo)
 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 {
 	int dpmemsz, memsz;
+	u8 *dp_mem;
 	uint dp_addr;
 	u8 *mem_addr;
 	dma_addr_t dma_addr;
@@ -136,12 +137,13 @@ int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 	pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
 
 	dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
-	dp_addr = m8xx_cpm_dpalloc(dpmemsz);
-	if (dp_addr == CPM_DP_NOSPACE) {
+	dp_mem = m8xx_cpm_dpalloc(dpmemsz);
+	if (dp_mem == NULL) {
 		printk(KERN_ERR
 		       "cpm_uart_cpm1.c: could not allocate buffer descriptors\n");
 		return -ENOMEM;
 	}
+	dp_addr = m8xx_cpm_dpram_offset(dp_mem);
 
 	memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
 	    L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
@@ -152,10 +154,8 @@ int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 		mem_addr = dma_alloc_coherent(NULL, memsz, &dma_addr,
 					      GFP_KERNEL);
 
-	/* We cant really from memory allocated via cpm2_dpalloc,
-	 * fix this if in the future we can */
 	if (mem_addr == NULL) {
-		/* XXX cpm_dpalloc does not yet free */
+		m8xx_cpm_dpfree(dp_mem);
 		printk(KERN_ERR
 		       "cpm_uart_cpm1.c: could not allocate coherent memory\n");
 		return -ENOMEM;
@@ -169,7 +169,7 @@ int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 	pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
 						       * pinfo->rx_fifosize);
 
-	pinfo->rx_bd_base = (volatile cbd_t *)(DPRAM_BASE + dp_addr);
+	pinfo->rx_bd_base = (volatile cbd_t *)dp_mem;
 	pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
 
 	return 0;
@@ -183,7 +183,7 @@ void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
 					 pinfo->tx_fifosize), pinfo->mem_addr,
 			  pinfo->dma_addr);
 
-	/* XXX cannot free dpmem yet */
+	m8xx_cpm_dpfree(m8xx_cpm_dpram_addr(pinfo->dp_addr));
 }
 
 /* Setup any dynamic params in the uart desc */

include/asm-ppc/commproc.h

@@ -66,7 +66,12 @@
  * and dual port ram.
  */
 extern	cpm8xx_t	*cpmp;		/* Pointer to comm processor */
-uint		m8xx_cpm_dpalloc(uint size);
+extern void *m8xx_cpm_dpalloc(int size);
+extern int m8xx_cpm_dpfree(void *addr);
+extern void *m8xx_cpm_dpalloc_fixed(void *addr, int size);
+extern void m8xx_cpm_dpdump(void);
+extern int m8xx_cpm_dpram_offset(void *addr);
+extern void *m8xx_cpm_dpram_addr(int offset);
 uint		m8xx_cpm_hostalloc(uint size);
 void		m8xx_cpm_setbrg(uint brg, uint rate);
 

include/asm-ppc/rheap.h

+/*
+ * include/asm-ppc/rheap.c
+ *
+ * Header file for the implementation of a remote heap.
+ *
+ * Author: Pantelis Antoniou <panto@intracom.gr>
+ *
+ * 2004 (c) INTRACOM S.A. Greece. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#ifndef __ASM_PPC_RHEAP_H__
+#define __ASM_PPC_RHEAP_H__
+
+#include <linux/list.h>
+
+typedef struct _rh_block {
+	struct list_head list;
+	void *start;
+	int size;
+	const char *owner;
+} rh_block_t;
+
+typedef struct _rh_info {
+	unsigned int alignment;
+	int max_blocks;
+	int empty_slots;
+	rh_block_t *block;
+	struct list_head empty_list;
+	struct list_head free_list;
+	struct list_head taken_list;
+	unsigned int flags;
+} rh_info_t;
+
+#define RHIF_STATIC_INFO	0x1
+#define RHIF_STATIC_BLOCK	0x2
+
+typedef struct rh_stats_t {
+	void *start;
+	int size;
+	const char *owner;
+} rh_stats_t;
+
+#define RHGS_FREE	0
+#define RHGS_TAKEN	1
+
+/* Create a remote heap dynamically */
+extern rh_info_t *rh_create(unsigned int alignment);
+
+/* Destroy a remote heap, created by rh_create() */
+extern void rh_destroy(rh_info_t * info);
+
+/* Initialize in place a remote info block */
+extern void rh_init(rh_info_t * info, unsigned int alignment, int max_blocks,
+		    rh_block_t * block);
+
+/* Attach a free region to manage */
+extern int rh_attach_region(rh_info_t * info, void *start, int size);
+
+/* Detach a free region */
+extern void *rh_detach_region(rh_info_t * info, void *start, int size);
+
+/* Allocate the given size from the remote heap */
+extern void *rh_alloc(rh_info_t * info, int size, const char *owner);
+
+/* Allocate the given size from the given address */
+extern void *rh_alloc_fixed(rh_info_t * info, void *start, int size,
+			    const char *owner);
+
+/* Free the allocated area */
+extern int rh_free(rh_info_t * info, void *start);
+
+/* Get stats for debugging purposes */
+extern int rh_get_stats(rh_info_t * info, int what, int max_stats,
+			rh_stats_t * stats);
+
+/* Simple dump of remote heap info */
+extern void rh_dump(rh_info_t * info);
+
+/* Set owner of taken block */
+extern int rh_set_owner(rh_info_t * info, void *start, const char *owner);
+
+#endif				/* __ASM_PPC_RHEAP_H__ */